forked from OSchip/llvm-project
4223 lines
172 KiB
C++
4223 lines
172 KiB
C++
//===------- CGObjCGNU.cpp - Emit LLVM Code from ASTs for a Module --------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This provides Objective-C code generation targeting the GNU runtime. The
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// class in this file generates structures used by the GNU Objective-C runtime
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// library. These structures are defined in objc/objc.h and objc/objc-api.h in
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// the GNU runtime distribution.
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//
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//===----------------------------------------------------------------------===//
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#include "CGCXXABI.h"
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#include "CGCleanup.h"
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#include "CGObjCRuntime.h"
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Attr.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/StmtObjC.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/CodeGen/ConstantInitBuilder.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ConvertUTF.h"
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#include <cctype>
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using namespace clang;
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using namespace CodeGen;
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namespace {
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/// Class that lazily initialises the runtime function. Avoids inserting the
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/// types and the function declaration into a module if they're not used, and
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/// avoids constructing the type more than once if it's used more than once.
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class LazyRuntimeFunction {
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CodeGenModule *CGM;
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llvm::FunctionType *FTy;
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const char *FunctionName;
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llvm::FunctionCallee Function;
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public:
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/// Constructor leaves this class uninitialized, because it is intended to
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/// be used as a field in another class and not all of the types that are
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/// used as arguments will necessarily be available at construction time.
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LazyRuntimeFunction()
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: CGM(nullptr), FunctionName(nullptr), Function(nullptr) {}
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/// Initialises the lazy function with the name, return type, and the types
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/// of the arguments.
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template <typename... Tys>
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void init(CodeGenModule *Mod, const char *name, llvm::Type *RetTy,
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Tys *... Types) {
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CGM = Mod;
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FunctionName = name;
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Function = nullptr;
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if(sizeof...(Tys)) {
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SmallVector<llvm::Type *, 8> ArgTys({Types...});
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FTy = llvm::FunctionType::get(RetTy, ArgTys, false);
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}
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else {
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FTy = llvm::FunctionType::get(RetTy, None, false);
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}
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}
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llvm::FunctionType *getType() { return FTy; }
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/// Overloaded cast operator, allows the class to be implicitly cast to an
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/// LLVM constant.
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operator llvm::FunctionCallee() {
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if (!Function) {
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if (!FunctionName)
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return nullptr;
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Function = CGM->CreateRuntimeFunction(FTy, FunctionName);
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}
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return Function;
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}
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};
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/// GNU Objective-C runtime code generation. This class implements the parts of
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/// Objective-C support that are specific to the GNU family of runtimes (GCC,
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/// GNUstep and ObjFW).
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class CGObjCGNU : public CGObjCRuntime {
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protected:
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/// The LLVM module into which output is inserted
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llvm::Module &TheModule;
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/// strut objc_super. Used for sending messages to super. This structure
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/// contains the receiver (object) and the expected class.
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llvm::StructType *ObjCSuperTy;
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/// struct objc_super*. The type of the argument to the superclass message
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/// lookup functions.
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llvm::PointerType *PtrToObjCSuperTy;
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/// LLVM type for selectors. Opaque pointer (i8*) unless a header declaring
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/// SEL is included in a header somewhere, in which case it will be whatever
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/// type is declared in that header, most likely {i8*, i8*}.
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llvm::PointerType *SelectorTy;
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/// LLVM i8 type. Cached here to avoid repeatedly getting it in all of the
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/// places where it's used
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llvm::IntegerType *Int8Ty;
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/// Pointer to i8 - LLVM type of char*, for all of the places where the
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/// runtime needs to deal with C strings.
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llvm::PointerType *PtrToInt8Ty;
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/// struct objc_protocol type
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llvm::StructType *ProtocolTy;
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/// Protocol * type.
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llvm::PointerType *ProtocolPtrTy;
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/// Instance Method Pointer type. This is a pointer to a function that takes,
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/// at a minimum, an object and a selector, and is the generic type for
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/// Objective-C methods. Due to differences between variadic / non-variadic
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/// calling conventions, it must always be cast to the correct type before
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/// actually being used.
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llvm::PointerType *IMPTy;
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/// Type of an untyped Objective-C object. Clang treats id as a built-in type
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/// when compiling Objective-C code, so this may be an opaque pointer (i8*),
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/// but if the runtime header declaring it is included then it may be a
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/// pointer to a structure.
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llvm::PointerType *IdTy;
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/// Pointer to a pointer to an Objective-C object. Used in the new ABI
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/// message lookup function and some GC-related functions.
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llvm::PointerType *PtrToIdTy;
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/// The clang type of id. Used when using the clang CGCall infrastructure to
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/// call Objective-C methods.
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CanQualType ASTIdTy;
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/// LLVM type for C int type.
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llvm::IntegerType *IntTy;
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/// LLVM type for an opaque pointer. This is identical to PtrToInt8Ty, but is
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/// used in the code to document the difference between i8* meaning a pointer
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/// to a C string and i8* meaning a pointer to some opaque type.
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llvm::PointerType *PtrTy;
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/// LLVM type for C long type. The runtime uses this in a lot of places where
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/// it should be using intptr_t, but we can't fix this without breaking
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/// compatibility with GCC...
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llvm::IntegerType *LongTy;
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/// LLVM type for C size_t. Used in various runtime data structures.
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llvm::IntegerType *SizeTy;
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/// LLVM type for C intptr_t.
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llvm::IntegerType *IntPtrTy;
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/// LLVM type for C ptrdiff_t. Mainly used in property accessor functions.
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llvm::IntegerType *PtrDiffTy;
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/// LLVM type for C int*. Used for GCC-ABI-compatible non-fragile instance
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/// variables.
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llvm::PointerType *PtrToIntTy;
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/// LLVM type for Objective-C BOOL type.
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llvm::Type *BoolTy;
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/// 32-bit integer type, to save us needing to look it up every time it's used.
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llvm::IntegerType *Int32Ty;
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/// 64-bit integer type, to save us needing to look it up every time it's used.
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llvm::IntegerType *Int64Ty;
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/// The type of struct objc_property.
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llvm::StructType *PropertyMetadataTy;
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/// Metadata kind used to tie method lookups to message sends. The GNUstep
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/// runtime provides some LLVM passes that can use this to do things like
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/// automatic IMP caching and speculative inlining.
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unsigned msgSendMDKind;
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/// Does the current target use SEH-based exceptions? False implies
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/// Itanium-style DWARF unwinding.
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bool usesSEHExceptions;
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/// Helper to check if we are targeting a specific runtime version or later.
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bool isRuntime(ObjCRuntime::Kind kind, unsigned major, unsigned minor=0) {
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const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime;
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return (R.getKind() == kind) &&
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(R.getVersion() >= VersionTuple(major, minor));
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}
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std::string ManglePublicSymbol(StringRef Name) {
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return (StringRef(CGM.getTriple().isOSBinFormatCOFF() ? "$_" : "._") + Name).str();
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}
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std::string SymbolForProtocol(Twine Name) {
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return (ManglePublicSymbol("OBJC_PROTOCOL_") + Name).str();
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}
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std::string SymbolForProtocolRef(StringRef Name) {
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return (ManglePublicSymbol("OBJC_REF_PROTOCOL_") + Name).str();
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}
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/// Helper function that generates a constant string and returns a pointer to
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/// the start of the string. The result of this function can be used anywhere
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/// where the C code specifies const char*.
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llvm::Constant *MakeConstantString(StringRef Str, const char *Name = "") {
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ConstantAddress Array =
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CGM.GetAddrOfConstantCString(std::string(Str), Name);
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return llvm::ConstantExpr::getGetElementPtr(Array.getElementType(),
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Array.getPointer(), Zeros);
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}
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/// Emits a linkonce_odr string, whose name is the prefix followed by the
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/// string value. This allows the linker to combine the strings between
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/// different modules. Used for EH typeinfo names, selector strings, and a
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/// few other things.
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llvm::Constant *ExportUniqueString(const std::string &Str,
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const std::string &prefix,
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bool Private=false) {
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std::string name = prefix + Str;
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auto *ConstStr = TheModule.getGlobalVariable(name);
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if (!ConstStr) {
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llvm::Constant *value = llvm::ConstantDataArray::getString(VMContext,Str);
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auto *GV = new llvm::GlobalVariable(TheModule, value->getType(), true,
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llvm::GlobalValue::LinkOnceODRLinkage, value, name);
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GV->setComdat(TheModule.getOrInsertComdat(name));
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if (Private)
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GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
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ConstStr = GV;
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}
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return llvm::ConstantExpr::getGetElementPtr(ConstStr->getValueType(),
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ConstStr, Zeros);
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}
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/// Returns a property name and encoding string.
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llvm::Constant *MakePropertyEncodingString(const ObjCPropertyDecl *PD,
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const Decl *Container) {
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assert(!isRuntime(ObjCRuntime::GNUstep, 2));
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if (isRuntime(ObjCRuntime::GNUstep, 1, 6)) {
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std::string NameAndAttributes;
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std::string TypeStr =
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CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container);
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NameAndAttributes += '\0';
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NameAndAttributes += TypeStr.length() + 3;
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NameAndAttributes += TypeStr;
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NameAndAttributes += '\0';
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NameAndAttributes += PD->getNameAsString();
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return MakeConstantString(NameAndAttributes);
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}
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return MakeConstantString(PD->getNameAsString());
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}
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/// Push the property attributes into two structure fields.
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void PushPropertyAttributes(ConstantStructBuilder &Fields,
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const ObjCPropertyDecl *property, bool isSynthesized=true, bool
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isDynamic=true) {
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int attrs = property->getPropertyAttributes();
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// For read-only properties, clear the copy and retain flags
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if (attrs & ObjCPropertyAttribute::kind_readonly) {
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attrs &= ~ObjCPropertyAttribute::kind_copy;
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attrs &= ~ObjCPropertyAttribute::kind_retain;
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attrs &= ~ObjCPropertyAttribute::kind_weak;
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attrs &= ~ObjCPropertyAttribute::kind_strong;
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}
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// The first flags field has the same attribute values as clang uses internally
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Fields.addInt(Int8Ty, attrs & 0xff);
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attrs >>= 8;
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attrs <<= 2;
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// For protocol properties, synthesized and dynamic have no meaning, so we
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// reuse these flags to indicate that this is a protocol property (both set
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// has no meaning, as a property can't be both synthesized and dynamic)
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attrs |= isSynthesized ? (1<<0) : 0;
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attrs |= isDynamic ? (1<<1) : 0;
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// The second field is the next four fields left shifted by two, with the
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// low bit set to indicate whether the field is synthesized or dynamic.
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Fields.addInt(Int8Ty, attrs & 0xff);
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// Two padding fields
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Fields.addInt(Int8Ty, 0);
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Fields.addInt(Int8Ty, 0);
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}
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virtual llvm::Constant *GenerateCategoryProtocolList(const
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ObjCCategoryDecl *OCD);
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virtual ConstantArrayBuilder PushPropertyListHeader(ConstantStructBuilder &Fields,
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int count) {
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// int count;
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Fields.addInt(IntTy, count);
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// int size; (only in GNUstep v2 ABI.
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if (isRuntime(ObjCRuntime::GNUstep, 2)) {
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llvm::DataLayout td(&TheModule);
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Fields.addInt(IntTy, td.getTypeSizeInBits(PropertyMetadataTy) /
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CGM.getContext().getCharWidth());
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}
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// struct objc_property_list *next;
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Fields.add(NULLPtr);
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// struct objc_property properties[]
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return Fields.beginArray(PropertyMetadataTy);
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}
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virtual void PushProperty(ConstantArrayBuilder &PropertiesArray,
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const ObjCPropertyDecl *property,
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const Decl *OCD,
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bool isSynthesized=true, bool
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isDynamic=true) {
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auto Fields = PropertiesArray.beginStruct(PropertyMetadataTy);
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ASTContext &Context = CGM.getContext();
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Fields.add(MakePropertyEncodingString(property, OCD));
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PushPropertyAttributes(Fields, property, isSynthesized, isDynamic);
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auto addPropertyMethod = [&](const ObjCMethodDecl *accessor) {
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if (accessor) {
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std::string TypeStr = Context.getObjCEncodingForMethodDecl(accessor);
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llvm::Constant *TypeEncoding = MakeConstantString(TypeStr);
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Fields.add(MakeConstantString(accessor->getSelector().getAsString()));
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Fields.add(TypeEncoding);
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} else {
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Fields.add(NULLPtr);
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Fields.add(NULLPtr);
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}
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};
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addPropertyMethod(property->getGetterMethodDecl());
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addPropertyMethod(property->getSetterMethodDecl());
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Fields.finishAndAddTo(PropertiesArray);
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}
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/// Ensures that the value has the required type, by inserting a bitcast if
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/// required. This function lets us avoid inserting bitcasts that are
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/// redundant.
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llvm::Value* EnforceType(CGBuilderTy &B, llvm::Value *V, llvm::Type *Ty) {
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if (V->getType() == Ty) return V;
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return B.CreateBitCast(V, Ty);
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}
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Address EnforceType(CGBuilderTy &B, Address V, llvm::Type *Ty) {
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if (V.getType() == Ty)
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return V;
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return B.CreateElementBitCast(V, Ty->getPointerElementType());
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}
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// Some zeros used for GEPs in lots of places.
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llvm::Constant *Zeros[2];
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/// Null pointer value. Mainly used as a terminator in various arrays.
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llvm::Constant *NULLPtr;
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/// LLVM context.
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llvm::LLVMContext &VMContext;
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protected:
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/// Placeholder for the class. Lots of things refer to the class before we've
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/// actually emitted it. We use this alias as a placeholder, and then replace
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/// it with a pointer to the class structure before finally emitting the
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/// module.
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llvm::GlobalAlias *ClassPtrAlias;
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/// Placeholder for the metaclass. Lots of things refer to the class before
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/// we've / actually emitted it. We use this alias as a placeholder, and then
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/// replace / it with a pointer to the metaclass structure before finally
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/// emitting the / module.
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llvm::GlobalAlias *MetaClassPtrAlias;
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/// All of the classes that have been generated for this compilation units.
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std::vector<llvm::Constant*> Classes;
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/// All of the categories that have been generated for this compilation units.
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std::vector<llvm::Constant*> Categories;
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/// All of the Objective-C constant strings that have been generated for this
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/// compilation units.
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std::vector<llvm::Constant*> ConstantStrings;
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/// Map from string values to Objective-C constant strings in the output.
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/// Used to prevent emitting Objective-C strings more than once. This should
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/// not be required at all - CodeGenModule should manage this list.
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llvm::StringMap<llvm::Constant*> ObjCStrings;
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/// All of the protocols that have been declared.
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llvm::StringMap<llvm::Constant*> ExistingProtocols;
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/// For each variant of a selector, we store the type encoding and a
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/// placeholder value. For an untyped selector, the type will be the empty
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/// string. Selector references are all done via the module's selector table,
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/// so we create an alias as a placeholder and then replace it with the real
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/// value later.
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typedef std::pair<std::string, llvm::GlobalAlias*> TypedSelector;
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/// Type of the selector map. This is roughly equivalent to the structure
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/// used in the GNUstep runtime, which maintains a list of all of the valid
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/// types for a selector in a table.
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typedef llvm::DenseMap<Selector, SmallVector<TypedSelector, 2> >
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SelectorMap;
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/// A map from selectors to selector types. This allows us to emit all
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/// selectors of the same name and type together.
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SelectorMap SelectorTable;
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/// Selectors related to memory management. When compiling in GC mode, we
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/// omit these.
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Selector RetainSel, ReleaseSel, AutoreleaseSel;
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/// Runtime functions used for memory management in GC mode. Note that clang
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/// supports code generation for calling these functions, but neither GNU
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/// runtime actually supports this API properly yet.
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LazyRuntimeFunction IvarAssignFn, StrongCastAssignFn, MemMoveFn, WeakReadFn,
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WeakAssignFn, GlobalAssignFn;
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typedef std::pair<std::string, std::string> ClassAliasPair;
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/// All classes that have aliases set for them.
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std::vector<ClassAliasPair> ClassAliases;
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protected:
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/// Function used for throwing Objective-C exceptions.
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LazyRuntimeFunction ExceptionThrowFn;
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/// Function used for rethrowing exceptions, used at the end of \@finally or
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/// \@synchronize blocks.
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LazyRuntimeFunction ExceptionReThrowFn;
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/// Function called when entering a catch function. This is required for
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/// differentiating Objective-C exceptions and foreign exceptions.
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LazyRuntimeFunction EnterCatchFn;
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/// Function called when exiting from a catch block. Used to do exception
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/// cleanup.
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LazyRuntimeFunction ExitCatchFn;
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/// Function called when entering an \@synchronize block. Acquires the lock.
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LazyRuntimeFunction SyncEnterFn;
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/// Function called when exiting an \@synchronize block. Releases the lock.
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LazyRuntimeFunction SyncExitFn;
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private:
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/// Function called if fast enumeration detects that the collection is
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/// modified during the update.
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LazyRuntimeFunction EnumerationMutationFn;
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/// Function for implementing synthesized property getters that return an
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/// object.
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LazyRuntimeFunction GetPropertyFn;
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/// Function for implementing synthesized property setters that return an
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/// object.
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LazyRuntimeFunction SetPropertyFn;
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/// Function used for non-object declared property getters.
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LazyRuntimeFunction GetStructPropertyFn;
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/// Function used for non-object declared property setters.
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LazyRuntimeFunction SetStructPropertyFn;
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protected:
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/// The version of the runtime that this class targets. Must match the
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/// version in the runtime.
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int RuntimeVersion;
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/// The version of the protocol class. Used to differentiate between ObjC1
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/// and ObjC2 protocols. Objective-C 1 protocols can not contain optional
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/// components and can not contain declared properties. We always emit
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/// Objective-C 2 property structures, but we have to pretend that they're
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/// Objective-C 1 property structures when targeting the GCC runtime or it
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/// will abort.
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const int ProtocolVersion;
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/// The version of the class ABI. This value is used in the class structure
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/// and indicates how various fields should be interpreted.
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const int ClassABIVersion;
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/// Generates an instance variable list structure. This is a structure
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/// containing a size and an array of structures containing instance variable
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/// metadata. This is used purely for introspection in the fragile ABI. In
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/// the non-fragile ABI, it's used for instance variable fixup.
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virtual llvm::Constant *GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames,
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ArrayRef<llvm::Constant *> IvarTypes,
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ArrayRef<llvm::Constant *> IvarOffsets,
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ArrayRef<llvm::Constant *> IvarAlign,
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ArrayRef<Qualifiers::ObjCLifetime> IvarOwnership);
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/// Generates a method list structure. This is a structure containing a size
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/// and an array of structures containing method metadata.
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///
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/// This structure is used by both classes and categories, and contains a next
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/// pointer allowing them to be chained together in a linked list.
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llvm::Constant *GenerateMethodList(StringRef ClassName,
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StringRef CategoryName,
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ArrayRef<const ObjCMethodDecl*> Methods,
|
|
bool isClassMethodList);
|
|
|
|
/// Emits an empty protocol. This is used for \@protocol() where no protocol
|
|
/// is found. The runtime will (hopefully) fix up the pointer to refer to the
|
|
/// real protocol.
|
|
virtual llvm::Constant *GenerateEmptyProtocol(StringRef ProtocolName);
|
|
|
|
/// Generates a list of property metadata structures. This follows the same
|
|
/// pattern as method and instance variable metadata lists.
|
|
llvm::Constant *GeneratePropertyList(const Decl *Container,
|
|
const ObjCContainerDecl *OCD,
|
|
bool isClassProperty=false,
|
|
bool protocolOptionalProperties=false);
|
|
|
|
/// Generates a list of referenced protocols. Classes, categories, and
|
|
/// protocols all use this structure.
|
|
llvm::Constant *GenerateProtocolList(ArrayRef<std::string> Protocols);
|
|
|
|
/// To ensure that all protocols are seen by the runtime, we add a category on
|
|
/// a class defined in the runtime, declaring no methods, but adopting the
|
|
/// protocols. This is a horribly ugly hack, but it allows us to collect all
|
|
/// of the protocols without changing the ABI.
|
|
void GenerateProtocolHolderCategory();
|
|
|
|
/// Generates a class structure.
|
|
llvm::Constant *GenerateClassStructure(
|
|
llvm::Constant *MetaClass,
|
|
llvm::Constant *SuperClass,
|
|
unsigned info,
|
|
const char *Name,
|
|
llvm::Constant *Version,
|
|
llvm::Constant *InstanceSize,
|
|
llvm::Constant *IVars,
|
|
llvm::Constant *Methods,
|
|
llvm::Constant *Protocols,
|
|
llvm::Constant *IvarOffsets,
|
|
llvm::Constant *Properties,
|
|
llvm::Constant *StrongIvarBitmap,
|
|
llvm::Constant *WeakIvarBitmap,
|
|
bool isMeta=false);
|
|
|
|
/// Generates a method list. This is used by protocols to define the required
|
|
/// and optional methods.
|
|
virtual llvm::Constant *GenerateProtocolMethodList(
|
|
ArrayRef<const ObjCMethodDecl*> Methods);
|
|
/// Emits optional and required method lists.
|
|
template<class T>
|
|
void EmitProtocolMethodList(T &&Methods, llvm::Constant *&Required,
|
|
llvm::Constant *&Optional) {
|
|
SmallVector<const ObjCMethodDecl*, 16> RequiredMethods;
|
|
SmallVector<const ObjCMethodDecl*, 16> OptionalMethods;
|
|
for (const auto *I : Methods)
|
|
if (I->isOptional())
|
|
OptionalMethods.push_back(I);
|
|
else
|
|
RequiredMethods.push_back(I);
|
|
Required = GenerateProtocolMethodList(RequiredMethods);
|
|
Optional = GenerateProtocolMethodList(OptionalMethods);
|
|
}
|
|
|
|
/// Returns a selector with the specified type encoding. An empty string is
|
|
/// used to return an untyped selector (with the types field set to NULL).
|
|
virtual llvm::Value *GetTypedSelector(CodeGenFunction &CGF, Selector Sel,
|
|
const std::string &TypeEncoding);
|
|
|
|
/// Returns the name of ivar offset variables. In the GNUstep v1 ABI, this
|
|
/// contains the class and ivar names, in the v2 ABI this contains the type
|
|
/// encoding as well.
|
|
virtual std::string GetIVarOffsetVariableName(const ObjCInterfaceDecl *ID,
|
|
const ObjCIvarDecl *Ivar) {
|
|
const std::string Name = "__objc_ivar_offset_" + ID->getNameAsString()
|
|
+ '.' + Ivar->getNameAsString();
|
|
return Name;
|
|
}
|
|
/// Returns the variable used to store the offset of an instance variable.
|
|
llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID,
|
|
const ObjCIvarDecl *Ivar);
|
|
/// Emits a reference to a class. This allows the linker to object if there
|
|
/// is no class of the matching name.
|
|
void EmitClassRef(const std::string &className);
|
|
|
|
/// Emits a pointer to the named class
|
|
virtual llvm::Value *GetClassNamed(CodeGenFunction &CGF,
|
|
const std::string &Name, bool isWeak);
|
|
|
|
/// Looks up the method for sending a message to the specified object. This
|
|
/// mechanism differs between the GCC and GNU runtimes, so this method must be
|
|
/// overridden in subclasses.
|
|
virtual llvm::Value *LookupIMP(CodeGenFunction &CGF,
|
|
llvm::Value *&Receiver,
|
|
llvm::Value *cmd,
|
|
llvm::MDNode *node,
|
|
MessageSendInfo &MSI) = 0;
|
|
|
|
/// Looks up the method for sending a message to a superclass. This
|
|
/// mechanism differs between the GCC and GNU runtimes, so this method must
|
|
/// be overridden in subclasses.
|
|
virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF,
|
|
Address ObjCSuper,
|
|
llvm::Value *cmd,
|
|
MessageSendInfo &MSI) = 0;
|
|
|
|
/// Libobjc2 uses a bitfield representation where small(ish) bitfields are
|
|
/// stored in a 64-bit value with the low bit set to 1 and the remaining 63
|
|
/// bits set to their values, LSB first, while larger ones are stored in a
|
|
/// structure of this / form:
|
|
///
|
|
/// struct { int32_t length; int32_t values[length]; };
|
|
///
|
|
/// The values in the array are stored in host-endian format, with the least
|
|
/// significant bit being assumed to come first in the bitfield. Therefore,
|
|
/// a bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] },
|
|
/// while a bitfield / with the 63rd bit set will be 1<<64.
|
|
llvm::Constant *MakeBitField(ArrayRef<bool> bits);
|
|
|
|
public:
|
|
CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
|
|
unsigned protocolClassVersion, unsigned classABI=1);
|
|
|
|
ConstantAddress GenerateConstantString(const StringLiteral *) override;
|
|
|
|
RValue
|
|
GenerateMessageSend(CodeGenFunction &CGF, ReturnValueSlot Return,
|
|
QualType ResultType, Selector Sel,
|
|
llvm::Value *Receiver, const CallArgList &CallArgs,
|
|
const ObjCInterfaceDecl *Class,
|
|
const ObjCMethodDecl *Method) override;
|
|
RValue
|
|
GenerateMessageSendSuper(CodeGenFunction &CGF, ReturnValueSlot Return,
|
|
QualType ResultType, Selector Sel,
|
|
const ObjCInterfaceDecl *Class,
|
|
bool isCategoryImpl, llvm::Value *Receiver,
|
|
bool IsClassMessage, const CallArgList &CallArgs,
|
|
const ObjCMethodDecl *Method) override;
|
|
llvm::Value *GetClass(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *OID) override;
|
|
llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override;
|
|
Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override;
|
|
llvm::Value *GetSelector(CodeGenFunction &CGF,
|
|
const ObjCMethodDecl *Method) override;
|
|
virtual llvm::Constant *GetConstantSelector(Selector Sel,
|
|
const std::string &TypeEncoding) {
|
|
llvm_unreachable("Runtime unable to generate constant selector");
|
|
}
|
|
llvm::Constant *GetConstantSelector(const ObjCMethodDecl *M) {
|
|
return GetConstantSelector(M->getSelector(),
|
|
CGM.getContext().getObjCEncodingForMethodDecl(M));
|
|
}
|
|
llvm::Constant *GetEHType(QualType T) override;
|
|
|
|
llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
|
|
const ObjCContainerDecl *CD) override;
|
|
void GenerateDirectMethodPrologue(CodeGenFunction &CGF, llvm::Function *Fn,
|
|
const ObjCMethodDecl *OMD,
|
|
const ObjCContainerDecl *CD) override;
|
|
void GenerateCategory(const ObjCCategoryImplDecl *CMD) override;
|
|
void GenerateClass(const ObjCImplementationDecl *ClassDecl) override;
|
|
void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override;
|
|
llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
|
|
const ObjCProtocolDecl *PD) override;
|
|
void GenerateProtocol(const ObjCProtocolDecl *PD) override;
|
|
|
|
virtual llvm::Constant *GenerateProtocolRef(const ObjCProtocolDecl *PD);
|
|
|
|
llvm::Constant *GetOrEmitProtocol(const ObjCProtocolDecl *PD) override {
|
|
return GenerateProtocolRef(PD);
|
|
}
|
|
|
|
llvm::Function *ModuleInitFunction() override;
|
|
llvm::FunctionCallee GetPropertyGetFunction() override;
|
|
llvm::FunctionCallee GetPropertySetFunction() override;
|
|
llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic,
|
|
bool copy) override;
|
|
llvm::FunctionCallee GetSetStructFunction() override;
|
|
llvm::FunctionCallee GetGetStructFunction() override;
|
|
llvm::FunctionCallee GetCppAtomicObjectGetFunction() override;
|
|
llvm::FunctionCallee GetCppAtomicObjectSetFunction() override;
|
|
llvm::FunctionCallee EnumerationMutationFunction() override;
|
|
|
|
void EmitTryStmt(CodeGenFunction &CGF,
|
|
const ObjCAtTryStmt &S) override;
|
|
void EmitSynchronizedStmt(CodeGenFunction &CGF,
|
|
const ObjCAtSynchronizedStmt &S) override;
|
|
void EmitThrowStmt(CodeGenFunction &CGF,
|
|
const ObjCAtThrowStmt &S,
|
|
bool ClearInsertionPoint=true) override;
|
|
llvm::Value * EmitObjCWeakRead(CodeGenFunction &CGF,
|
|
Address AddrWeakObj) override;
|
|
void EmitObjCWeakAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst) override;
|
|
void EmitObjCGlobalAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dest,
|
|
bool threadlocal=false) override;
|
|
void EmitObjCIvarAssign(CodeGenFunction &CGF, llvm::Value *src,
|
|
Address dest, llvm::Value *ivarOffset) override;
|
|
void EmitObjCStrongCastAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dest) override;
|
|
void EmitGCMemmoveCollectable(CodeGenFunction &CGF, Address DestPtr,
|
|
Address SrcPtr,
|
|
llvm::Value *Size) override;
|
|
LValue EmitObjCValueForIvar(CodeGenFunction &CGF, QualType ObjectTy,
|
|
llvm::Value *BaseValue, const ObjCIvarDecl *Ivar,
|
|
unsigned CVRQualifiers) override;
|
|
llvm::Value *EmitIvarOffset(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *Interface,
|
|
const ObjCIvarDecl *Ivar) override;
|
|
llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override;
|
|
llvm::Constant *BuildGCBlockLayout(CodeGenModule &CGM,
|
|
const CGBlockInfo &blockInfo) override {
|
|
return NULLPtr;
|
|
}
|
|
llvm::Constant *BuildRCBlockLayout(CodeGenModule &CGM,
|
|
const CGBlockInfo &blockInfo) override {
|
|
return NULLPtr;
|
|
}
|
|
|
|
llvm::Constant *BuildByrefLayout(CodeGenModule &CGM, QualType T) override {
|
|
return NULLPtr;
|
|
}
|
|
};
|
|
|
|
/// Class representing the legacy GCC Objective-C ABI. This is the default when
|
|
/// -fobjc-nonfragile-abi is not specified.
|
|
///
|
|
/// The GCC ABI target actually generates code that is approximately compatible
|
|
/// with the new GNUstep runtime ABI, but refrains from using any features that
|
|
/// would not work with the GCC runtime. For example, clang always generates
|
|
/// the extended form of the class structure, and the extra fields are simply
|
|
/// ignored by GCC libobjc.
|
|
class CGObjCGCC : public CGObjCGNU {
|
|
/// The GCC ABI message lookup function. Returns an IMP pointing to the
|
|
/// method implementation for this message.
|
|
LazyRuntimeFunction MsgLookupFn;
|
|
/// The GCC ABI superclass message lookup function. Takes a pointer to a
|
|
/// structure describing the receiver and the class, and a selector as
|
|
/// arguments. Returns the IMP for the corresponding method.
|
|
LazyRuntimeFunction MsgLookupSuperFn;
|
|
|
|
protected:
|
|
llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
|
|
llvm::Value *cmd, llvm::MDNode *node,
|
|
MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *args[] = {
|
|
EnforceType(Builder, Receiver, IdTy),
|
|
EnforceType(Builder, cmd, SelectorTy) };
|
|
llvm::CallBase *imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args);
|
|
imp->setMetadata(msgSendMDKind, node);
|
|
return imp;
|
|
}
|
|
|
|
llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
|
|
llvm::Value *cmd, MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *lookupArgs[] = {EnforceType(Builder, ObjCSuper,
|
|
PtrToObjCSuperTy).getPointer(), cmd};
|
|
return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs);
|
|
}
|
|
|
|
public:
|
|
CGObjCGCC(CodeGenModule &Mod) : CGObjCGNU(Mod, 8, 2) {
|
|
// IMP objc_msg_lookup(id, SEL);
|
|
MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy);
|
|
// IMP objc_msg_lookup_super(struct objc_super*, SEL);
|
|
MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy,
|
|
PtrToObjCSuperTy, SelectorTy);
|
|
}
|
|
};
|
|
|
|
/// Class used when targeting the new GNUstep runtime ABI.
|
|
class CGObjCGNUstep : public CGObjCGNU {
|
|
/// The slot lookup function. Returns a pointer to a cacheable structure
|
|
/// that contains (among other things) the IMP.
|
|
LazyRuntimeFunction SlotLookupFn;
|
|
/// The GNUstep ABI superclass message lookup function. Takes a pointer to
|
|
/// a structure describing the receiver and the class, and a selector as
|
|
/// arguments. Returns the slot for the corresponding method. Superclass
|
|
/// message lookup rarely changes, so this is a good caching opportunity.
|
|
LazyRuntimeFunction SlotLookupSuperFn;
|
|
/// Specialised function for setting atomic retain properties
|
|
LazyRuntimeFunction SetPropertyAtomic;
|
|
/// Specialised function for setting atomic copy properties
|
|
LazyRuntimeFunction SetPropertyAtomicCopy;
|
|
/// Specialised function for setting nonatomic retain properties
|
|
LazyRuntimeFunction SetPropertyNonAtomic;
|
|
/// Specialised function for setting nonatomic copy properties
|
|
LazyRuntimeFunction SetPropertyNonAtomicCopy;
|
|
/// Function to perform atomic copies of C++ objects with nontrivial copy
|
|
/// constructors from Objective-C ivars.
|
|
LazyRuntimeFunction CxxAtomicObjectGetFn;
|
|
/// Function to perform atomic copies of C++ objects with nontrivial copy
|
|
/// constructors to Objective-C ivars.
|
|
LazyRuntimeFunction CxxAtomicObjectSetFn;
|
|
/// Type of a slot structure pointer. This is returned by the various
|
|
/// lookup functions.
|
|
llvm::Type *SlotTy;
|
|
/// Type of a slot structure.
|
|
llvm::Type *SlotStructTy;
|
|
|
|
public:
|
|
llvm::Constant *GetEHType(QualType T) override;
|
|
|
|
protected:
|
|
llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
|
|
llvm::Value *cmd, llvm::MDNode *node,
|
|
MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::FunctionCallee LookupFn = SlotLookupFn;
|
|
|
|
// Store the receiver on the stack so that we can reload it later
|
|
Address ReceiverPtr =
|
|
CGF.CreateTempAlloca(Receiver->getType(), CGF.getPointerAlign());
|
|
Builder.CreateStore(Receiver, ReceiverPtr);
|
|
|
|
llvm::Value *self;
|
|
|
|
if (isa<ObjCMethodDecl>(CGF.CurCodeDecl)) {
|
|
self = CGF.LoadObjCSelf();
|
|
} else {
|
|
self = llvm::ConstantPointerNull::get(IdTy);
|
|
}
|
|
|
|
// The lookup function is guaranteed not to capture the receiver pointer.
|
|
if (auto *LookupFn2 = dyn_cast<llvm::Function>(LookupFn.getCallee()))
|
|
LookupFn2->addParamAttr(0, llvm::Attribute::NoCapture);
|
|
|
|
llvm::Value *args[] = {
|
|
EnforceType(Builder, ReceiverPtr.getPointer(), PtrToIdTy),
|
|
EnforceType(Builder, cmd, SelectorTy),
|
|
EnforceType(Builder, self, IdTy) };
|
|
llvm::CallBase *slot = CGF.EmitRuntimeCallOrInvoke(LookupFn, args);
|
|
slot->setOnlyReadsMemory();
|
|
slot->setMetadata(msgSendMDKind, node);
|
|
|
|
// Load the imp from the slot
|
|
llvm::Value *imp = Builder.CreateAlignedLoad(
|
|
IMPTy, Builder.CreateStructGEP(SlotStructTy, slot, 4),
|
|
CGF.getPointerAlign());
|
|
|
|
// The lookup function may have changed the receiver, so make sure we use
|
|
// the new one.
|
|
Receiver = Builder.CreateLoad(ReceiverPtr, true);
|
|
return imp;
|
|
}
|
|
|
|
llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
|
|
llvm::Value *cmd,
|
|
MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *lookupArgs[] = {ObjCSuper.getPointer(), cmd};
|
|
|
|
llvm::CallInst *slot =
|
|
CGF.EmitNounwindRuntimeCall(SlotLookupSuperFn, lookupArgs);
|
|
slot->setOnlyReadsMemory();
|
|
|
|
return Builder.CreateAlignedLoad(
|
|
IMPTy, Builder.CreateStructGEP(SlotStructTy, slot, 4),
|
|
CGF.getPointerAlign());
|
|
}
|
|
|
|
public:
|
|
CGObjCGNUstep(CodeGenModule &Mod) : CGObjCGNUstep(Mod, 9, 3, 1) {}
|
|
CGObjCGNUstep(CodeGenModule &Mod, unsigned ABI, unsigned ProtocolABI,
|
|
unsigned ClassABI) :
|
|
CGObjCGNU(Mod, ABI, ProtocolABI, ClassABI) {
|
|
const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime;
|
|
|
|
SlotStructTy = llvm::StructType::get(PtrTy, PtrTy, PtrTy, IntTy, IMPTy);
|
|
SlotTy = llvm::PointerType::getUnqual(SlotStructTy);
|
|
// Slot_t objc_msg_lookup_sender(id *receiver, SEL selector, id sender);
|
|
SlotLookupFn.init(&CGM, "objc_msg_lookup_sender", SlotTy, PtrToIdTy,
|
|
SelectorTy, IdTy);
|
|
// Slot_t objc_slot_lookup_super(struct objc_super*, SEL);
|
|
SlotLookupSuperFn.init(&CGM, "objc_slot_lookup_super", SlotTy,
|
|
PtrToObjCSuperTy, SelectorTy);
|
|
// If we're in ObjC++ mode, then we want to make
|
|
if (usesSEHExceptions) {
|
|
llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
|
|
// void objc_exception_rethrow(void)
|
|
ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy);
|
|
} else if (CGM.getLangOpts().CPlusPlus) {
|
|
llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
|
|
// void *__cxa_begin_catch(void *e)
|
|
EnterCatchFn.init(&CGM, "__cxa_begin_catch", PtrTy, PtrTy);
|
|
// void __cxa_end_catch(void)
|
|
ExitCatchFn.init(&CGM, "__cxa_end_catch", VoidTy);
|
|
// void _Unwind_Resume_or_Rethrow(void*)
|
|
ExceptionReThrowFn.init(&CGM, "_Unwind_Resume_or_Rethrow", VoidTy,
|
|
PtrTy);
|
|
} else if (R.getVersion() >= VersionTuple(1, 7)) {
|
|
llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
|
|
// id objc_begin_catch(void *e)
|
|
EnterCatchFn.init(&CGM, "objc_begin_catch", IdTy, PtrTy);
|
|
// void objc_end_catch(void)
|
|
ExitCatchFn.init(&CGM, "objc_end_catch", VoidTy);
|
|
// void _Unwind_Resume_or_Rethrow(void*)
|
|
ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy, PtrTy);
|
|
}
|
|
llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
|
|
SetPropertyAtomic.init(&CGM, "objc_setProperty_atomic", VoidTy, IdTy,
|
|
SelectorTy, IdTy, PtrDiffTy);
|
|
SetPropertyAtomicCopy.init(&CGM, "objc_setProperty_atomic_copy", VoidTy,
|
|
IdTy, SelectorTy, IdTy, PtrDiffTy);
|
|
SetPropertyNonAtomic.init(&CGM, "objc_setProperty_nonatomic", VoidTy,
|
|
IdTy, SelectorTy, IdTy, PtrDiffTy);
|
|
SetPropertyNonAtomicCopy.init(&CGM, "objc_setProperty_nonatomic_copy",
|
|
VoidTy, IdTy, SelectorTy, IdTy, PtrDiffTy);
|
|
// void objc_setCppObjectAtomic(void *dest, const void *src, void
|
|
// *helper);
|
|
CxxAtomicObjectSetFn.init(&CGM, "objc_setCppObjectAtomic", VoidTy, PtrTy,
|
|
PtrTy, PtrTy);
|
|
// void objc_getCppObjectAtomic(void *dest, const void *src, void
|
|
// *helper);
|
|
CxxAtomicObjectGetFn.init(&CGM, "objc_getCppObjectAtomic", VoidTy, PtrTy,
|
|
PtrTy, PtrTy);
|
|
}
|
|
|
|
llvm::FunctionCallee GetCppAtomicObjectGetFunction() override {
|
|
// The optimised functions were added in version 1.7 of the GNUstep
|
|
// runtime.
|
|
assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
|
|
VersionTuple(1, 7));
|
|
return CxxAtomicObjectGetFn;
|
|
}
|
|
|
|
llvm::FunctionCallee GetCppAtomicObjectSetFunction() override {
|
|
// The optimised functions were added in version 1.7 of the GNUstep
|
|
// runtime.
|
|
assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
|
|
VersionTuple(1, 7));
|
|
return CxxAtomicObjectSetFn;
|
|
}
|
|
|
|
llvm::FunctionCallee GetOptimizedPropertySetFunction(bool atomic,
|
|
bool copy) override {
|
|
// The optimised property functions omit the GC check, and so are not
|
|
// safe to use in GC mode. The standard functions are fast in GC mode,
|
|
// so there is less advantage in using them.
|
|
assert ((CGM.getLangOpts().getGC() == LangOptions::NonGC));
|
|
// The optimised functions were added in version 1.7 of the GNUstep
|
|
// runtime.
|
|
assert (CGM.getLangOpts().ObjCRuntime.getVersion() >=
|
|
VersionTuple(1, 7));
|
|
|
|
if (atomic) {
|
|
if (copy) return SetPropertyAtomicCopy;
|
|
return SetPropertyAtomic;
|
|
}
|
|
|
|
return copy ? SetPropertyNonAtomicCopy : SetPropertyNonAtomic;
|
|
}
|
|
};
|
|
|
|
/// GNUstep Objective-C ABI version 2 implementation.
|
|
/// This is the ABI that provides a clean break with the legacy GCC ABI and
|
|
/// cleans up a number of things that were added to work around 1980s linkers.
|
|
class CGObjCGNUstep2 : public CGObjCGNUstep {
|
|
enum SectionKind
|
|
{
|
|
SelectorSection = 0,
|
|
ClassSection,
|
|
ClassReferenceSection,
|
|
CategorySection,
|
|
ProtocolSection,
|
|
ProtocolReferenceSection,
|
|
ClassAliasSection,
|
|
ConstantStringSection
|
|
};
|
|
static const char *const SectionsBaseNames[8];
|
|
static const char *const PECOFFSectionsBaseNames[8];
|
|
template<SectionKind K>
|
|
std::string sectionName() {
|
|
if (CGM.getTriple().isOSBinFormatCOFF()) {
|
|
std::string name(PECOFFSectionsBaseNames[K]);
|
|
name += "$m";
|
|
return name;
|
|
}
|
|
return SectionsBaseNames[K];
|
|
}
|
|
/// The GCC ABI superclass message lookup function. Takes a pointer to a
|
|
/// structure describing the receiver and the class, and a selector as
|
|
/// arguments. Returns the IMP for the corresponding method.
|
|
LazyRuntimeFunction MsgLookupSuperFn;
|
|
/// A flag indicating if we've emitted at least one protocol.
|
|
/// If we haven't, then we need to emit an empty protocol, to ensure that the
|
|
/// __start__objc_protocols and __stop__objc_protocols sections exist.
|
|
bool EmittedProtocol = false;
|
|
/// A flag indicating if we've emitted at least one protocol reference.
|
|
/// If we haven't, then we need to emit an empty protocol, to ensure that the
|
|
/// __start__objc_protocol_refs and __stop__objc_protocol_refs sections
|
|
/// exist.
|
|
bool EmittedProtocolRef = false;
|
|
/// A flag indicating if we've emitted at least one class.
|
|
/// If we haven't, then we need to emit an empty protocol, to ensure that the
|
|
/// __start__objc_classes and __stop__objc_classes sections / exist.
|
|
bool EmittedClass = false;
|
|
/// Generate the name of a symbol for a reference to a class. Accesses to
|
|
/// classes should be indirected via this.
|
|
|
|
typedef std::pair<std::string, std::pair<llvm::GlobalVariable*, int>>
|
|
EarlyInitPair;
|
|
std::vector<EarlyInitPair> EarlyInitList;
|
|
|
|
std::string SymbolForClassRef(StringRef Name, bool isWeak) {
|
|
if (isWeak)
|
|
return (ManglePublicSymbol("OBJC_WEAK_REF_CLASS_") + Name).str();
|
|
else
|
|
return (ManglePublicSymbol("OBJC_REF_CLASS_") + Name).str();
|
|
}
|
|
/// Generate the name of a class symbol.
|
|
std::string SymbolForClass(StringRef Name) {
|
|
return (ManglePublicSymbol("OBJC_CLASS_") + Name).str();
|
|
}
|
|
void CallRuntimeFunction(CGBuilderTy &B, StringRef FunctionName,
|
|
ArrayRef<llvm::Value*> Args) {
|
|
SmallVector<llvm::Type *,8> Types;
|
|
for (auto *Arg : Args)
|
|
Types.push_back(Arg->getType());
|
|
llvm::FunctionType *FT = llvm::FunctionType::get(B.getVoidTy(), Types,
|
|
false);
|
|
llvm::FunctionCallee Fn = CGM.CreateRuntimeFunction(FT, FunctionName);
|
|
B.CreateCall(Fn, Args);
|
|
}
|
|
|
|
ConstantAddress GenerateConstantString(const StringLiteral *SL) override {
|
|
|
|
auto Str = SL->getString();
|
|
CharUnits Align = CGM.getPointerAlign();
|
|
|
|
// Look for an existing one
|
|
llvm::StringMap<llvm::Constant*>::iterator old = ObjCStrings.find(Str);
|
|
if (old != ObjCStrings.end())
|
|
return ConstantAddress(
|
|
old->getValue(), old->getValue()->getType()->getPointerElementType(),
|
|
Align);
|
|
|
|
bool isNonASCII = SL->containsNonAscii();
|
|
|
|
auto LiteralLength = SL->getLength();
|
|
|
|
if ((CGM.getTarget().getPointerWidth(0) == 64) &&
|
|
(LiteralLength < 9) && !isNonASCII) {
|
|
// Tiny strings are only used on 64-bit platforms. They store 8 7-bit
|
|
// ASCII characters in the high 56 bits, followed by a 4-bit length and a
|
|
// 3-bit tag (which is always 4).
|
|
uint64_t str = 0;
|
|
// Fill in the characters
|
|
for (unsigned i=0 ; i<LiteralLength ; i++)
|
|
str |= ((uint64_t)SL->getCodeUnit(i)) << ((64 - 4 - 3) - (i*7));
|
|
// Fill in the length
|
|
str |= LiteralLength << 3;
|
|
// Set the tag
|
|
str |= 4;
|
|
auto *ObjCStr = llvm::ConstantExpr::getIntToPtr(
|
|
llvm::ConstantInt::get(Int64Ty, str), IdTy);
|
|
ObjCStrings[Str] = ObjCStr;
|
|
return ConstantAddress(ObjCStr, IdTy->getPointerElementType(), Align);
|
|
}
|
|
|
|
StringRef StringClass = CGM.getLangOpts().ObjCConstantStringClass;
|
|
|
|
if (StringClass.empty()) StringClass = "NSConstantString";
|
|
|
|
std::string Sym = SymbolForClass(StringClass);
|
|
|
|
llvm::Constant *isa = TheModule.getNamedGlobal(Sym);
|
|
|
|
if (!isa) {
|
|
isa = new llvm::GlobalVariable(TheModule, IdTy, /* isConstant */false,
|
|
llvm::GlobalValue::ExternalLinkage, nullptr, Sym);
|
|
if (CGM.getTriple().isOSBinFormatCOFF()) {
|
|
cast<llvm::GlobalValue>(isa)->setDLLStorageClass(llvm::GlobalValue::DLLImportStorageClass);
|
|
}
|
|
} else if (isa->getType() != PtrToIdTy)
|
|
isa = llvm::ConstantExpr::getBitCast(isa, PtrToIdTy);
|
|
|
|
// struct
|
|
// {
|
|
// Class isa;
|
|
// uint32_t flags;
|
|
// uint32_t length; // Number of codepoints
|
|
// uint32_t size; // Number of bytes
|
|
// uint32_t hash;
|
|
// const char *data;
|
|
// };
|
|
|
|
ConstantInitBuilder Builder(CGM);
|
|
auto Fields = Builder.beginStruct();
|
|
if (!CGM.getTriple().isOSBinFormatCOFF()) {
|
|
Fields.add(isa);
|
|
} else {
|
|
Fields.addNullPointer(PtrTy);
|
|
}
|
|
// For now, all non-ASCII strings are represented as UTF-16. As such, the
|
|
// number of bytes is simply double the number of UTF-16 codepoints. In
|
|
// ASCII strings, the number of bytes is equal to the number of non-ASCII
|
|
// codepoints.
|
|
if (isNonASCII) {
|
|
unsigned NumU8CodeUnits = Str.size();
|
|
// A UTF-16 representation of a unicode string contains at most the same
|
|
// number of code units as a UTF-8 representation. Allocate that much
|
|
// space, plus one for the final null character.
|
|
SmallVector<llvm::UTF16, 128> ToBuf(NumU8CodeUnits + 1);
|
|
const llvm::UTF8 *FromPtr = (const llvm::UTF8 *)Str.data();
|
|
llvm::UTF16 *ToPtr = &ToBuf[0];
|
|
(void)llvm::ConvertUTF8toUTF16(&FromPtr, FromPtr + NumU8CodeUnits,
|
|
&ToPtr, ToPtr + NumU8CodeUnits, llvm::strictConversion);
|
|
uint32_t StringLength = ToPtr - &ToBuf[0];
|
|
// Add null terminator
|
|
*ToPtr = 0;
|
|
// Flags: 2 indicates UTF-16 encoding
|
|
Fields.addInt(Int32Ty, 2);
|
|
// Number of UTF-16 codepoints
|
|
Fields.addInt(Int32Ty, StringLength);
|
|
// Number of bytes
|
|
Fields.addInt(Int32Ty, StringLength * 2);
|
|
// Hash. Not currently initialised by the compiler.
|
|
Fields.addInt(Int32Ty, 0);
|
|
// pointer to the data string.
|
|
auto Arr = llvm::makeArrayRef(&ToBuf[0], ToPtr+1);
|
|
auto *C = llvm::ConstantDataArray::get(VMContext, Arr);
|
|
auto *Buffer = new llvm::GlobalVariable(TheModule, C->getType(),
|
|
/*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, C, ".str");
|
|
Buffer->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
|
|
Fields.add(Buffer);
|
|
} else {
|
|
// Flags: 0 indicates ASCII encoding
|
|
Fields.addInt(Int32Ty, 0);
|
|
// Number of UTF-16 codepoints, each ASCII byte is a UTF-16 codepoint
|
|
Fields.addInt(Int32Ty, Str.size());
|
|
// Number of bytes
|
|
Fields.addInt(Int32Ty, Str.size());
|
|
// Hash. Not currently initialised by the compiler.
|
|
Fields.addInt(Int32Ty, 0);
|
|
// Data pointer
|
|
Fields.add(MakeConstantString(Str));
|
|
}
|
|
std::string StringName;
|
|
bool isNamed = !isNonASCII;
|
|
if (isNamed) {
|
|
StringName = ".objc_str_";
|
|
for (int i=0,e=Str.size() ; i<e ; ++i) {
|
|
unsigned char c = Str[i];
|
|
if (isalnum(c))
|
|
StringName += c;
|
|
else if (c == ' ')
|
|
StringName += '_';
|
|
else {
|
|
isNamed = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
llvm::GlobalVariable *ObjCStrGV =
|
|
Fields.finishAndCreateGlobal(
|
|
isNamed ? StringRef(StringName) : ".objc_string",
|
|
Align, false, isNamed ? llvm::GlobalValue::LinkOnceODRLinkage
|
|
: llvm::GlobalValue::PrivateLinkage);
|
|
ObjCStrGV->setSection(sectionName<ConstantStringSection>());
|
|
if (isNamed) {
|
|
ObjCStrGV->setComdat(TheModule.getOrInsertComdat(StringName));
|
|
ObjCStrGV->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
}
|
|
if (CGM.getTriple().isOSBinFormatCOFF()) {
|
|
std::pair<llvm::GlobalVariable*, int> v{ObjCStrGV, 0};
|
|
EarlyInitList.emplace_back(Sym, v);
|
|
}
|
|
llvm::Constant *ObjCStr = llvm::ConstantExpr::getBitCast(ObjCStrGV, IdTy);
|
|
ObjCStrings[Str] = ObjCStr;
|
|
ConstantStrings.push_back(ObjCStr);
|
|
return ConstantAddress(ObjCStr, IdTy->getPointerElementType(), Align);
|
|
}
|
|
|
|
void PushProperty(ConstantArrayBuilder &PropertiesArray,
|
|
const ObjCPropertyDecl *property,
|
|
const Decl *OCD,
|
|
bool isSynthesized=true, bool
|
|
isDynamic=true) override {
|
|
// struct objc_property
|
|
// {
|
|
// const char *name;
|
|
// const char *attributes;
|
|
// const char *type;
|
|
// SEL getter;
|
|
// SEL setter;
|
|
// };
|
|
auto Fields = PropertiesArray.beginStruct(PropertyMetadataTy);
|
|
ASTContext &Context = CGM.getContext();
|
|
Fields.add(MakeConstantString(property->getNameAsString()));
|
|
std::string TypeStr =
|
|
CGM.getContext().getObjCEncodingForPropertyDecl(property, OCD);
|
|
Fields.add(MakeConstantString(TypeStr));
|
|
std::string typeStr;
|
|
Context.getObjCEncodingForType(property->getType(), typeStr);
|
|
Fields.add(MakeConstantString(typeStr));
|
|
auto addPropertyMethod = [&](const ObjCMethodDecl *accessor) {
|
|
if (accessor) {
|
|
std::string TypeStr = Context.getObjCEncodingForMethodDecl(accessor);
|
|
Fields.add(GetConstantSelector(accessor->getSelector(), TypeStr));
|
|
} else {
|
|
Fields.add(NULLPtr);
|
|
}
|
|
};
|
|
addPropertyMethod(property->getGetterMethodDecl());
|
|
addPropertyMethod(property->getSetterMethodDecl());
|
|
Fields.finishAndAddTo(PropertiesArray);
|
|
}
|
|
|
|
llvm::Constant *
|
|
GenerateProtocolMethodList(ArrayRef<const ObjCMethodDecl*> Methods) override {
|
|
// struct objc_protocol_method_description
|
|
// {
|
|
// SEL selector;
|
|
// const char *types;
|
|
// };
|
|
llvm::StructType *ObjCMethodDescTy =
|
|
llvm::StructType::get(CGM.getLLVMContext(),
|
|
{ PtrToInt8Ty, PtrToInt8Ty });
|
|
ASTContext &Context = CGM.getContext();
|
|
ConstantInitBuilder Builder(CGM);
|
|
// struct objc_protocol_method_description_list
|
|
// {
|
|
// int count;
|
|
// int size;
|
|
// struct objc_protocol_method_description methods[];
|
|
// };
|
|
auto MethodList = Builder.beginStruct();
|
|
// int count;
|
|
MethodList.addInt(IntTy, Methods.size());
|
|
// int size; // sizeof(struct objc_method_description)
|
|
llvm::DataLayout td(&TheModule);
|
|
MethodList.addInt(IntTy, td.getTypeSizeInBits(ObjCMethodDescTy) /
|
|
CGM.getContext().getCharWidth());
|
|
// struct objc_method_description[]
|
|
auto MethodArray = MethodList.beginArray(ObjCMethodDescTy);
|
|
for (auto *M : Methods) {
|
|
auto Method = MethodArray.beginStruct(ObjCMethodDescTy);
|
|
Method.add(CGObjCGNU::GetConstantSelector(M));
|
|
Method.add(GetTypeString(Context.getObjCEncodingForMethodDecl(M, true)));
|
|
Method.finishAndAddTo(MethodArray);
|
|
}
|
|
MethodArray.finishAndAddTo(MethodList);
|
|
return MethodList.finishAndCreateGlobal(".objc_protocol_method_list",
|
|
CGM.getPointerAlign());
|
|
}
|
|
llvm::Constant *GenerateCategoryProtocolList(const ObjCCategoryDecl *OCD)
|
|
override {
|
|
const auto &ReferencedProtocols = OCD->getReferencedProtocols();
|
|
auto RuntimeProtocols = GetRuntimeProtocolList(ReferencedProtocols.begin(),
|
|
ReferencedProtocols.end());
|
|
SmallVector<llvm::Constant *, 16> Protocols;
|
|
for (const auto *PI : RuntimeProtocols)
|
|
Protocols.push_back(
|
|
llvm::ConstantExpr::getBitCast(GenerateProtocolRef(PI),
|
|
ProtocolPtrTy));
|
|
return GenerateProtocolList(Protocols);
|
|
}
|
|
|
|
llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
|
|
llvm::Value *cmd, MessageSendInfo &MSI) override {
|
|
// Don't access the slot unless we're trying to cache the result.
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *lookupArgs[] = {CGObjCGNU::EnforceType(Builder, ObjCSuper,
|
|
PtrToObjCSuperTy).getPointer(), cmd};
|
|
return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs);
|
|
}
|
|
|
|
llvm::GlobalVariable *GetClassVar(StringRef Name, bool isWeak=false) {
|
|
std::string SymbolName = SymbolForClassRef(Name, isWeak);
|
|
auto *ClassSymbol = TheModule.getNamedGlobal(SymbolName);
|
|
if (ClassSymbol)
|
|
return ClassSymbol;
|
|
ClassSymbol = new llvm::GlobalVariable(TheModule,
|
|
IdTy, false, llvm::GlobalValue::ExternalLinkage,
|
|
nullptr, SymbolName);
|
|
// If this is a weak symbol, then we are creating a valid definition for
|
|
// the symbol, pointing to a weak definition of the real class pointer. If
|
|
// this is not a weak reference, then we are expecting another compilation
|
|
// unit to provide the real indirection symbol.
|
|
if (isWeak)
|
|
ClassSymbol->setInitializer(new llvm::GlobalVariable(TheModule,
|
|
Int8Ty, false, llvm::GlobalValue::ExternalWeakLinkage,
|
|
nullptr, SymbolForClass(Name)));
|
|
else {
|
|
if (CGM.getTriple().isOSBinFormatCOFF()) {
|
|
IdentifierInfo &II = CGM.getContext().Idents.get(Name);
|
|
TranslationUnitDecl *TUDecl = CGM.getContext().getTranslationUnitDecl();
|
|
DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
|
|
|
|
const ObjCInterfaceDecl *OID = nullptr;
|
|
for (const auto *Result : DC->lookup(&II))
|
|
if ((OID = dyn_cast<ObjCInterfaceDecl>(Result)))
|
|
break;
|
|
|
|
// The first Interface we find may be a @class,
|
|
// which should only be treated as the source of
|
|
// truth in the absence of a true declaration.
|
|
assert(OID && "Failed to find ObjCInterfaceDecl");
|
|
const ObjCInterfaceDecl *OIDDef = OID->getDefinition();
|
|
if (OIDDef != nullptr)
|
|
OID = OIDDef;
|
|
|
|
auto Storage = llvm::GlobalValue::DefaultStorageClass;
|
|
if (OID->hasAttr<DLLImportAttr>())
|
|
Storage = llvm::GlobalValue::DLLImportStorageClass;
|
|
else if (OID->hasAttr<DLLExportAttr>())
|
|
Storage = llvm::GlobalValue::DLLExportStorageClass;
|
|
|
|
cast<llvm::GlobalValue>(ClassSymbol)->setDLLStorageClass(Storage);
|
|
}
|
|
}
|
|
assert(ClassSymbol->getName() == SymbolName);
|
|
return ClassSymbol;
|
|
}
|
|
llvm::Value *GetClassNamed(CodeGenFunction &CGF,
|
|
const std::string &Name,
|
|
bool isWeak) override {
|
|
return CGF.Builder.CreateLoad(
|
|
Address::deprecated(GetClassVar(Name, isWeak), CGM.getPointerAlign()));
|
|
}
|
|
int32_t FlagsForOwnership(Qualifiers::ObjCLifetime Ownership) {
|
|
// typedef enum {
|
|
// ownership_invalid = 0,
|
|
// ownership_strong = 1,
|
|
// ownership_weak = 2,
|
|
// ownership_unsafe = 3
|
|
// } ivar_ownership;
|
|
int Flag;
|
|
switch (Ownership) {
|
|
case Qualifiers::OCL_Strong:
|
|
Flag = 1;
|
|
break;
|
|
case Qualifiers::OCL_Weak:
|
|
Flag = 2;
|
|
break;
|
|
case Qualifiers::OCL_ExplicitNone:
|
|
Flag = 3;
|
|
break;
|
|
case Qualifiers::OCL_None:
|
|
case Qualifiers::OCL_Autoreleasing:
|
|
assert(Ownership != Qualifiers::OCL_Autoreleasing);
|
|
Flag = 0;
|
|
}
|
|
return Flag;
|
|
}
|
|
llvm::Constant *GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames,
|
|
ArrayRef<llvm::Constant *> IvarTypes,
|
|
ArrayRef<llvm::Constant *> IvarOffsets,
|
|
ArrayRef<llvm::Constant *> IvarAlign,
|
|
ArrayRef<Qualifiers::ObjCLifetime> IvarOwnership) override {
|
|
llvm_unreachable("Method should not be called!");
|
|
}
|
|
|
|
llvm::Constant *GenerateEmptyProtocol(StringRef ProtocolName) override {
|
|
std::string Name = SymbolForProtocol(ProtocolName);
|
|
auto *GV = TheModule.getGlobalVariable(Name);
|
|
if (!GV) {
|
|
// Emit a placeholder symbol.
|
|
GV = new llvm::GlobalVariable(TheModule, ProtocolTy, false,
|
|
llvm::GlobalValue::ExternalLinkage, nullptr, Name);
|
|
GV->setAlignment(CGM.getPointerAlign().getAsAlign());
|
|
}
|
|
return llvm::ConstantExpr::getBitCast(GV, ProtocolPtrTy);
|
|
}
|
|
|
|
/// Existing protocol references.
|
|
llvm::StringMap<llvm::Constant*> ExistingProtocolRefs;
|
|
|
|
llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
|
|
const ObjCProtocolDecl *PD) override {
|
|
auto Name = PD->getNameAsString();
|
|
auto *&Ref = ExistingProtocolRefs[Name];
|
|
if (!Ref) {
|
|
auto *&Protocol = ExistingProtocols[Name];
|
|
if (!Protocol)
|
|
Protocol = GenerateProtocolRef(PD);
|
|
std::string RefName = SymbolForProtocolRef(Name);
|
|
assert(!TheModule.getGlobalVariable(RefName));
|
|
// Emit a reference symbol.
|
|
auto GV = new llvm::GlobalVariable(TheModule, ProtocolPtrTy,
|
|
false, llvm::GlobalValue::LinkOnceODRLinkage,
|
|
llvm::ConstantExpr::getBitCast(Protocol, ProtocolPtrTy), RefName);
|
|
GV->setComdat(TheModule.getOrInsertComdat(RefName));
|
|
GV->setSection(sectionName<ProtocolReferenceSection>());
|
|
GV->setAlignment(CGM.getPointerAlign().getAsAlign());
|
|
Ref = GV;
|
|
}
|
|
EmittedProtocolRef = true;
|
|
return CGF.Builder.CreateAlignedLoad(ProtocolPtrTy, Ref,
|
|
CGM.getPointerAlign());
|
|
}
|
|
|
|
llvm::Constant *GenerateProtocolList(ArrayRef<llvm::Constant*> Protocols) {
|
|
llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(ProtocolPtrTy,
|
|
Protocols.size());
|
|
llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy,
|
|
Protocols);
|
|
ConstantInitBuilder builder(CGM);
|
|
auto ProtocolBuilder = builder.beginStruct();
|
|
ProtocolBuilder.addNullPointer(PtrTy);
|
|
ProtocolBuilder.addInt(SizeTy, Protocols.size());
|
|
ProtocolBuilder.add(ProtocolArray);
|
|
return ProtocolBuilder.finishAndCreateGlobal(".objc_protocol_list",
|
|
CGM.getPointerAlign(), false, llvm::GlobalValue::InternalLinkage);
|
|
}
|
|
|
|
void GenerateProtocol(const ObjCProtocolDecl *PD) override {
|
|
// Do nothing - we only emit referenced protocols.
|
|
}
|
|
llvm::Constant *GenerateProtocolRef(const ObjCProtocolDecl *PD) override {
|
|
std::string ProtocolName = PD->getNameAsString();
|
|
auto *&Protocol = ExistingProtocols[ProtocolName];
|
|
if (Protocol)
|
|
return Protocol;
|
|
|
|
EmittedProtocol = true;
|
|
|
|
auto SymName = SymbolForProtocol(ProtocolName);
|
|
auto *OldGV = TheModule.getGlobalVariable(SymName);
|
|
|
|
// Use the protocol definition, if there is one.
|
|
if (const ObjCProtocolDecl *Def = PD->getDefinition())
|
|
PD = Def;
|
|
else {
|
|
// If there is no definition, then create an external linkage symbol and
|
|
// hope that someone else fills it in for us (and fail to link if they
|
|
// don't).
|
|
assert(!OldGV);
|
|
Protocol = new llvm::GlobalVariable(TheModule, ProtocolTy,
|
|
/*isConstant*/false,
|
|
llvm::GlobalValue::ExternalLinkage, nullptr, SymName);
|
|
return Protocol;
|
|
}
|
|
|
|
SmallVector<llvm::Constant*, 16> Protocols;
|
|
auto RuntimeProtocols =
|
|
GetRuntimeProtocolList(PD->protocol_begin(), PD->protocol_end());
|
|
for (const auto *PI : RuntimeProtocols)
|
|
Protocols.push_back(
|
|
llvm::ConstantExpr::getBitCast(GenerateProtocolRef(PI),
|
|
ProtocolPtrTy));
|
|
llvm::Constant *ProtocolList = GenerateProtocolList(Protocols);
|
|
|
|
// Collect information about methods
|
|
llvm::Constant *InstanceMethodList, *OptionalInstanceMethodList;
|
|
llvm::Constant *ClassMethodList, *OptionalClassMethodList;
|
|
EmitProtocolMethodList(PD->instance_methods(), InstanceMethodList,
|
|
OptionalInstanceMethodList);
|
|
EmitProtocolMethodList(PD->class_methods(), ClassMethodList,
|
|
OptionalClassMethodList);
|
|
|
|
// The isa pointer must be set to a magic number so the runtime knows it's
|
|
// the correct layout.
|
|
ConstantInitBuilder builder(CGM);
|
|
auto ProtocolBuilder = builder.beginStruct();
|
|
ProtocolBuilder.add(llvm::ConstantExpr::getIntToPtr(
|
|
llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy));
|
|
ProtocolBuilder.add(MakeConstantString(ProtocolName));
|
|
ProtocolBuilder.add(ProtocolList);
|
|
ProtocolBuilder.add(InstanceMethodList);
|
|
ProtocolBuilder.add(ClassMethodList);
|
|
ProtocolBuilder.add(OptionalInstanceMethodList);
|
|
ProtocolBuilder.add(OptionalClassMethodList);
|
|
// Required instance properties
|
|
ProtocolBuilder.add(GeneratePropertyList(nullptr, PD, false, false));
|
|
// Optional instance properties
|
|
ProtocolBuilder.add(GeneratePropertyList(nullptr, PD, false, true));
|
|
// Required class properties
|
|
ProtocolBuilder.add(GeneratePropertyList(nullptr, PD, true, false));
|
|
// Optional class properties
|
|
ProtocolBuilder.add(GeneratePropertyList(nullptr, PD, true, true));
|
|
|
|
auto *GV = ProtocolBuilder.finishAndCreateGlobal(SymName,
|
|
CGM.getPointerAlign(), false, llvm::GlobalValue::ExternalLinkage);
|
|
GV->setSection(sectionName<ProtocolSection>());
|
|
GV->setComdat(TheModule.getOrInsertComdat(SymName));
|
|
if (OldGV) {
|
|
OldGV->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(GV,
|
|
OldGV->getType()));
|
|
OldGV->removeFromParent();
|
|
GV->setName(SymName);
|
|
}
|
|
Protocol = GV;
|
|
return GV;
|
|
}
|
|
llvm::Constant *EnforceType(llvm::Constant *Val, llvm::Type *Ty) {
|
|
if (Val->getType() == Ty)
|
|
return Val;
|
|
return llvm::ConstantExpr::getBitCast(Val, Ty);
|
|
}
|
|
llvm::Value *GetTypedSelector(CodeGenFunction &CGF, Selector Sel,
|
|
const std::string &TypeEncoding) override {
|
|
return GetConstantSelector(Sel, TypeEncoding);
|
|
}
|
|
llvm::Constant *GetTypeString(llvm::StringRef TypeEncoding) {
|
|
if (TypeEncoding.empty())
|
|
return NULLPtr;
|
|
std::string MangledTypes = std::string(TypeEncoding);
|
|
std::replace(MangledTypes.begin(), MangledTypes.end(),
|
|
'@', '\1');
|
|
std::string TypesVarName = ".objc_sel_types_" + MangledTypes;
|
|
auto *TypesGlobal = TheModule.getGlobalVariable(TypesVarName);
|
|
if (!TypesGlobal) {
|
|
llvm::Constant *Init = llvm::ConstantDataArray::getString(VMContext,
|
|
TypeEncoding);
|
|
auto *GV = new llvm::GlobalVariable(TheModule, Init->getType(),
|
|
true, llvm::GlobalValue::LinkOnceODRLinkage, Init, TypesVarName);
|
|
GV->setComdat(TheModule.getOrInsertComdat(TypesVarName));
|
|
GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
TypesGlobal = GV;
|
|
}
|
|
return llvm::ConstantExpr::getGetElementPtr(TypesGlobal->getValueType(),
|
|
TypesGlobal, Zeros);
|
|
}
|
|
llvm::Constant *GetConstantSelector(Selector Sel,
|
|
const std::string &TypeEncoding) override {
|
|
// @ is used as a special character in symbol names (used for symbol
|
|
// versioning), so mangle the name to not include it. Replace it with a
|
|
// character that is not a valid type encoding character (and, being
|
|
// non-printable, never will be!)
|
|
std::string MangledTypes = TypeEncoding;
|
|
std::replace(MangledTypes.begin(), MangledTypes.end(),
|
|
'@', '\1');
|
|
auto SelVarName = (StringRef(".objc_selector_") + Sel.getAsString() + "_" +
|
|
MangledTypes).str();
|
|
if (auto *GV = TheModule.getNamedGlobal(SelVarName))
|
|
return EnforceType(GV, SelectorTy);
|
|
ConstantInitBuilder builder(CGM);
|
|
auto SelBuilder = builder.beginStruct();
|
|
SelBuilder.add(ExportUniqueString(Sel.getAsString(), ".objc_sel_name_",
|
|
true));
|
|
SelBuilder.add(GetTypeString(TypeEncoding));
|
|
auto *GV = SelBuilder.finishAndCreateGlobal(SelVarName,
|
|
CGM.getPointerAlign(), false, llvm::GlobalValue::LinkOnceODRLinkage);
|
|
GV->setComdat(TheModule.getOrInsertComdat(SelVarName));
|
|
GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
GV->setSection(sectionName<SelectorSection>());
|
|
auto *SelVal = EnforceType(GV, SelectorTy);
|
|
return SelVal;
|
|
}
|
|
llvm::StructType *emptyStruct = nullptr;
|
|
|
|
/// Return pointers to the start and end of a section. On ELF platforms, we
|
|
/// use the __start_ and __stop_ symbols that GNU-compatible linkers will set
|
|
/// to the start and end of section names, as long as those section names are
|
|
/// valid identifiers and the symbols are referenced but not defined. On
|
|
/// Windows, we use the fact that MSVC-compatible linkers will lexically sort
|
|
/// by subsections and place everything that we want to reference in a middle
|
|
/// subsection and then insert zero-sized symbols in subsections a and z.
|
|
std::pair<llvm::Constant*,llvm::Constant*>
|
|
GetSectionBounds(StringRef Section) {
|
|
if (CGM.getTriple().isOSBinFormatCOFF()) {
|
|
if (emptyStruct == nullptr) {
|
|
emptyStruct = llvm::StructType::create(VMContext, ".objc_section_sentinel");
|
|
emptyStruct->setBody({}, /*isPacked*/true);
|
|
}
|
|
auto ZeroInit = llvm::Constant::getNullValue(emptyStruct);
|
|
auto Sym = [&](StringRef Prefix, StringRef SecSuffix) {
|
|
auto *Sym = new llvm::GlobalVariable(TheModule, emptyStruct,
|
|
/*isConstant*/false,
|
|
llvm::GlobalValue::LinkOnceODRLinkage, ZeroInit, Prefix +
|
|
Section);
|
|
Sym->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
Sym->setSection((Section + SecSuffix).str());
|
|
Sym->setComdat(TheModule.getOrInsertComdat((Prefix +
|
|
Section).str()));
|
|
Sym->setAlignment(CGM.getPointerAlign().getAsAlign());
|
|
return Sym;
|
|
};
|
|
return { Sym("__start_", "$a"), Sym("__stop", "$z") };
|
|
}
|
|
auto *Start = new llvm::GlobalVariable(TheModule, PtrTy,
|
|
/*isConstant*/false,
|
|
llvm::GlobalValue::ExternalLinkage, nullptr, StringRef("__start_") +
|
|
Section);
|
|
Start->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
auto *Stop = new llvm::GlobalVariable(TheModule, PtrTy,
|
|
/*isConstant*/false,
|
|
llvm::GlobalValue::ExternalLinkage, nullptr, StringRef("__stop_") +
|
|
Section);
|
|
Stop->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
return { Start, Stop };
|
|
}
|
|
CatchTypeInfo getCatchAllTypeInfo() override {
|
|
return CGM.getCXXABI().getCatchAllTypeInfo();
|
|
}
|
|
llvm::Function *ModuleInitFunction() override {
|
|
llvm::Function *LoadFunction = llvm::Function::Create(
|
|
llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false),
|
|
llvm::GlobalValue::LinkOnceODRLinkage, ".objcv2_load_function",
|
|
&TheModule);
|
|
LoadFunction->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
LoadFunction->setComdat(TheModule.getOrInsertComdat(".objcv2_load_function"));
|
|
|
|
llvm::BasicBlock *EntryBB =
|
|
llvm::BasicBlock::Create(VMContext, "entry", LoadFunction);
|
|
CGBuilderTy B(CGM, VMContext);
|
|
B.SetInsertPoint(EntryBB);
|
|
ConstantInitBuilder builder(CGM);
|
|
auto InitStructBuilder = builder.beginStruct();
|
|
InitStructBuilder.addInt(Int64Ty, 0);
|
|
auto §ionVec = CGM.getTriple().isOSBinFormatCOFF() ? PECOFFSectionsBaseNames : SectionsBaseNames;
|
|
for (auto *s : sectionVec) {
|
|
auto bounds = GetSectionBounds(s);
|
|
InitStructBuilder.add(bounds.first);
|
|
InitStructBuilder.add(bounds.second);
|
|
}
|
|
auto *InitStruct = InitStructBuilder.finishAndCreateGlobal(".objc_init",
|
|
CGM.getPointerAlign(), false, llvm::GlobalValue::LinkOnceODRLinkage);
|
|
InitStruct->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
InitStruct->setComdat(TheModule.getOrInsertComdat(".objc_init"));
|
|
|
|
CallRuntimeFunction(B, "__objc_load", {InitStruct});;
|
|
B.CreateRetVoid();
|
|
// Make sure that the optimisers don't delete this function.
|
|
CGM.addCompilerUsedGlobal(LoadFunction);
|
|
// FIXME: Currently ELF only!
|
|
// We have to do this by hand, rather than with @llvm.ctors, so that the
|
|
// linker can remove the duplicate invocations.
|
|
auto *InitVar = new llvm::GlobalVariable(TheModule, LoadFunction->getType(),
|
|
/*isConstant*/false, llvm::GlobalValue::LinkOnceAnyLinkage,
|
|
LoadFunction, ".objc_ctor");
|
|
// Check that this hasn't been renamed. This shouldn't happen, because
|
|
// this function should be called precisely once.
|
|
assert(InitVar->getName() == ".objc_ctor");
|
|
// In Windows, initialisers are sorted by the suffix. XCL is for library
|
|
// initialisers, which run before user initialisers. We are running
|
|
// Objective-C loads at the end of library load. This means +load methods
|
|
// will run before any other static constructors, but that static
|
|
// constructors can see a fully initialised Objective-C state.
|
|
if (CGM.getTriple().isOSBinFormatCOFF())
|
|
InitVar->setSection(".CRT$XCLz");
|
|
else
|
|
{
|
|
if (CGM.getCodeGenOpts().UseInitArray)
|
|
InitVar->setSection(".init_array");
|
|
else
|
|
InitVar->setSection(".ctors");
|
|
}
|
|
InitVar->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
InitVar->setComdat(TheModule.getOrInsertComdat(".objc_ctor"));
|
|
CGM.addUsedGlobal(InitVar);
|
|
for (auto *C : Categories) {
|
|
auto *Cat = cast<llvm::GlobalVariable>(C->stripPointerCasts());
|
|
Cat->setSection(sectionName<CategorySection>());
|
|
CGM.addUsedGlobal(Cat);
|
|
}
|
|
auto createNullGlobal = [&](StringRef Name, ArrayRef<llvm::Constant*> Init,
|
|
StringRef Section) {
|
|
auto nullBuilder = builder.beginStruct();
|
|
for (auto *F : Init)
|
|
nullBuilder.add(F);
|
|
auto GV = nullBuilder.finishAndCreateGlobal(Name, CGM.getPointerAlign(),
|
|
false, llvm::GlobalValue::LinkOnceODRLinkage);
|
|
GV->setSection(Section);
|
|
GV->setComdat(TheModule.getOrInsertComdat(Name));
|
|
GV->setVisibility(llvm::GlobalValue::HiddenVisibility);
|
|
CGM.addUsedGlobal(GV);
|
|
return GV;
|
|
};
|
|
for (auto clsAlias : ClassAliases)
|
|
createNullGlobal(std::string(".objc_class_alias") +
|
|
clsAlias.second, { MakeConstantString(clsAlias.second),
|
|
GetClassVar(clsAlias.first) }, sectionName<ClassAliasSection>());
|
|
// On ELF platforms, add a null value for each special section so that we
|
|
// can always guarantee that the _start and _stop symbols will exist and be
|
|
// meaningful. This is not required on COFF platforms, where our start and
|
|
// stop symbols will create the section.
|
|
if (!CGM.getTriple().isOSBinFormatCOFF()) {
|
|
createNullGlobal(".objc_null_selector", {NULLPtr, NULLPtr},
|
|
sectionName<SelectorSection>());
|
|
if (Categories.empty())
|
|
createNullGlobal(".objc_null_category", {NULLPtr, NULLPtr,
|
|
NULLPtr, NULLPtr, NULLPtr, NULLPtr, NULLPtr},
|
|
sectionName<CategorySection>());
|
|
if (!EmittedClass) {
|
|
createNullGlobal(".objc_null_cls_init_ref", NULLPtr,
|
|
sectionName<ClassSection>());
|
|
createNullGlobal(".objc_null_class_ref", { NULLPtr, NULLPtr },
|
|
sectionName<ClassReferenceSection>());
|
|
}
|
|
if (!EmittedProtocol)
|
|
createNullGlobal(".objc_null_protocol", {NULLPtr, NULLPtr, NULLPtr,
|
|
NULLPtr, NULLPtr, NULLPtr, NULLPtr, NULLPtr, NULLPtr, NULLPtr,
|
|
NULLPtr}, sectionName<ProtocolSection>());
|
|
if (!EmittedProtocolRef)
|
|
createNullGlobal(".objc_null_protocol_ref", {NULLPtr},
|
|
sectionName<ProtocolReferenceSection>());
|
|
if (ClassAliases.empty())
|
|
createNullGlobal(".objc_null_class_alias", { NULLPtr, NULLPtr },
|
|
sectionName<ClassAliasSection>());
|
|
if (ConstantStrings.empty()) {
|
|
auto i32Zero = llvm::ConstantInt::get(Int32Ty, 0);
|
|
createNullGlobal(".objc_null_constant_string", { NULLPtr, i32Zero,
|
|
i32Zero, i32Zero, i32Zero, NULLPtr },
|
|
sectionName<ConstantStringSection>());
|
|
}
|
|
}
|
|
ConstantStrings.clear();
|
|
Categories.clear();
|
|
Classes.clear();
|
|
|
|
if (EarlyInitList.size() > 0) {
|
|
auto *Init = llvm::Function::Create(llvm::FunctionType::get(CGM.VoidTy,
|
|
{}), llvm::GlobalValue::InternalLinkage, ".objc_early_init",
|
|
&CGM.getModule());
|
|
llvm::IRBuilder<> b(llvm::BasicBlock::Create(CGM.getLLVMContext(), "entry",
|
|
Init));
|
|
for (const auto &lateInit : EarlyInitList) {
|
|
auto *global = TheModule.getGlobalVariable(lateInit.first);
|
|
if (global) {
|
|
llvm::GlobalVariable *GV = lateInit.second.first;
|
|
b.CreateAlignedStore(
|
|
global,
|
|
b.CreateStructGEP(GV->getValueType(), GV, lateInit.second.second),
|
|
CGM.getPointerAlign().getAsAlign());
|
|
}
|
|
}
|
|
b.CreateRetVoid();
|
|
// We can't use the normal LLVM global initialisation array, because we
|
|
// need to specify that this runs early in library initialisation.
|
|
auto *InitVar = new llvm::GlobalVariable(CGM.getModule(), Init->getType(),
|
|
/*isConstant*/true, llvm::GlobalValue::InternalLinkage,
|
|
Init, ".objc_early_init_ptr");
|
|
InitVar->setSection(".CRT$XCLb");
|
|
CGM.addUsedGlobal(InitVar);
|
|
}
|
|
return nullptr;
|
|
}
|
|
/// In the v2 ABI, ivar offset variables use the type encoding in their name
|
|
/// to trigger linker failures if the types don't match.
|
|
std::string GetIVarOffsetVariableName(const ObjCInterfaceDecl *ID,
|
|
const ObjCIvarDecl *Ivar) override {
|
|
std::string TypeEncoding;
|
|
CGM.getContext().getObjCEncodingForType(Ivar->getType(), TypeEncoding);
|
|
// Prevent the @ from being interpreted as a symbol version.
|
|
std::replace(TypeEncoding.begin(), TypeEncoding.end(),
|
|
'@', '\1');
|
|
const std::string Name = "__objc_ivar_offset_" + ID->getNameAsString()
|
|
+ '.' + Ivar->getNameAsString() + '.' + TypeEncoding;
|
|
return Name;
|
|
}
|
|
llvm::Value *EmitIvarOffset(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *Interface,
|
|
const ObjCIvarDecl *Ivar) override {
|
|
const std::string Name = GetIVarOffsetVariableName(Ivar->getContainingInterface(), Ivar);
|
|
llvm::GlobalVariable *IvarOffsetPointer = TheModule.getNamedGlobal(Name);
|
|
if (!IvarOffsetPointer)
|
|
IvarOffsetPointer = new llvm::GlobalVariable(TheModule, IntTy, false,
|
|
llvm::GlobalValue::ExternalLinkage, nullptr, Name);
|
|
CharUnits Align = CGM.getIntAlign();
|
|
llvm::Value *Offset =
|
|
CGF.Builder.CreateAlignedLoad(IntTy, IvarOffsetPointer, Align);
|
|
if (Offset->getType() != PtrDiffTy)
|
|
Offset = CGF.Builder.CreateZExtOrBitCast(Offset, PtrDiffTy);
|
|
return Offset;
|
|
}
|
|
void GenerateClass(const ObjCImplementationDecl *OID) override {
|
|
ASTContext &Context = CGM.getContext();
|
|
bool IsCOFF = CGM.getTriple().isOSBinFormatCOFF();
|
|
|
|
// Get the class name
|
|
ObjCInterfaceDecl *classDecl =
|
|
const_cast<ObjCInterfaceDecl *>(OID->getClassInterface());
|
|
std::string className = classDecl->getNameAsString();
|
|
auto *classNameConstant = MakeConstantString(className);
|
|
|
|
ConstantInitBuilder builder(CGM);
|
|
auto metaclassFields = builder.beginStruct();
|
|
// struct objc_class *isa;
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// struct objc_class *super_class;
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// const char *name;
|
|
metaclassFields.add(classNameConstant);
|
|
// long version;
|
|
metaclassFields.addInt(LongTy, 0);
|
|
// unsigned long info;
|
|
// objc_class_flag_meta
|
|
metaclassFields.addInt(LongTy, 1);
|
|
// long instance_size;
|
|
// Setting this to zero is consistent with the older ABI, but it might be
|
|
// more sensible to set this to sizeof(struct objc_class)
|
|
metaclassFields.addInt(LongTy, 0);
|
|
// struct objc_ivar_list *ivars;
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// struct objc_method_list *methods
|
|
// FIXME: Almost identical code is copied and pasted below for the
|
|
// class, but refactoring it cleanly requires C++14 generic lambdas.
|
|
if (OID->classmeth_begin() == OID->classmeth_end())
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
else {
|
|
SmallVector<ObjCMethodDecl*, 16> ClassMethods;
|
|
ClassMethods.insert(ClassMethods.begin(), OID->classmeth_begin(),
|
|
OID->classmeth_end());
|
|
metaclassFields.addBitCast(
|
|
GenerateMethodList(className, "", ClassMethods, true),
|
|
PtrTy);
|
|
}
|
|
// void *dtable;
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// IMP cxx_construct;
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// IMP cxx_destruct;
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// struct objc_class *subclass_list
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// struct objc_class *sibling_class
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// struct objc_protocol_list *protocols;
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// struct reference_list *extra_data;
|
|
metaclassFields.addNullPointer(PtrTy);
|
|
// long abi_version;
|
|
metaclassFields.addInt(LongTy, 0);
|
|
// struct objc_property_list *properties
|
|
metaclassFields.add(GeneratePropertyList(OID, classDecl, /*isClassProperty*/true));
|
|
|
|
auto *metaclass = metaclassFields.finishAndCreateGlobal(
|
|
ManglePublicSymbol("OBJC_METACLASS_") + className,
|
|
CGM.getPointerAlign());
|
|
|
|
auto classFields = builder.beginStruct();
|
|
// struct objc_class *isa;
|
|
classFields.add(metaclass);
|
|
// struct objc_class *super_class;
|
|
// Get the superclass name.
|
|
const ObjCInterfaceDecl * SuperClassDecl =
|
|
OID->getClassInterface()->getSuperClass();
|
|
llvm::Constant *SuperClass = nullptr;
|
|
if (SuperClassDecl) {
|
|
auto SuperClassName = SymbolForClass(SuperClassDecl->getNameAsString());
|
|
SuperClass = TheModule.getNamedGlobal(SuperClassName);
|
|
if (!SuperClass)
|
|
{
|
|
SuperClass = new llvm::GlobalVariable(TheModule, PtrTy, false,
|
|
llvm::GlobalValue::ExternalLinkage, nullptr, SuperClassName);
|
|
if (IsCOFF) {
|
|
auto Storage = llvm::GlobalValue::DefaultStorageClass;
|
|
if (SuperClassDecl->hasAttr<DLLImportAttr>())
|
|
Storage = llvm::GlobalValue::DLLImportStorageClass;
|
|
else if (SuperClassDecl->hasAttr<DLLExportAttr>())
|
|
Storage = llvm::GlobalValue::DLLExportStorageClass;
|
|
|
|
cast<llvm::GlobalValue>(SuperClass)->setDLLStorageClass(Storage);
|
|
}
|
|
}
|
|
if (!IsCOFF)
|
|
classFields.add(llvm::ConstantExpr::getBitCast(SuperClass, PtrTy));
|
|
else
|
|
classFields.addNullPointer(PtrTy);
|
|
} else
|
|
classFields.addNullPointer(PtrTy);
|
|
// const char *name;
|
|
classFields.add(classNameConstant);
|
|
// long version;
|
|
classFields.addInt(LongTy, 0);
|
|
// unsigned long info;
|
|
// !objc_class_flag_meta
|
|
classFields.addInt(LongTy, 0);
|
|
// long instance_size;
|
|
int superInstanceSize = !SuperClassDecl ? 0 :
|
|
Context.getASTObjCInterfaceLayout(SuperClassDecl).getSize().getQuantity();
|
|
// Instance size is negative for classes that have not yet had their ivar
|
|
// layout calculated.
|
|
classFields.addInt(LongTy,
|
|
0 - (Context.getASTObjCImplementationLayout(OID).getSize().getQuantity() -
|
|
superInstanceSize));
|
|
|
|
if (classDecl->all_declared_ivar_begin() == nullptr)
|
|
classFields.addNullPointer(PtrTy);
|
|
else {
|
|
int ivar_count = 0;
|
|
for (const ObjCIvarDecl *IVD = classDecl->all_declared_ivar_begin(); IVD;
|
|
IVD = IVD->getNextIvar()) ivar_count++;
|
|
llvm::DataLayout td(&TheModule);
|
|
// struct objc_ivar_list *ivars;
|
|
ConstantInitBuilder b(CGM);
|
|
auto ivarListBuilder = b.beginStruct();
|
|
// int count;
|
|
ivarListBuilder.addInt(IntTy, ivar_count);
|
|
// size_t size;
|
|
llvm::StructType *ObjCIvarTy = llvm::StructType::get(
|
|
PtrToInt8Ty,
|
|
PtrToInt8Ty,
|
|
PtrToInt8Ty,
|
|
Int32Ty,
|
|
Int32Ty);
|
|
ivarListBuilder.addInt(SizeTy, td.getTypeSizeInBits(ObjCIvarTy) /
|
|
CGM.getContext().getCharWidth());
|
|
// struct objc_ivar ivars[]
|
|
auto ivarArrayBuilder = ivarListBuilder.beginArray();
|
|
for (const ObjCIvarDecl *IVD = classDecl->all_declared_ivar_begin(); IVD;
|
|
IVD = IVD->getNextIvar()) {
|
|
auto ivarTy = IVD->getType();
|
|
auto ivarBuilder = ivarArrayBuilder.beginStruct();
|
|
// const char *name;
|
|
ivarBuilder.add(MakeConstantString(IVD->getNameAsString()));
|
|
// const char *type;
|
|
std::string TypeStr;
|
|
//Context.getObjCEncodingForType(ivarTy, TypeStr, IVD, true);
|
|
Context.getObjCEncodingForMethodParameter(Decl::OBJC_TQ_None, ivarTy, TypeStr, true);
|
|
ivarBuilder.add(MakeConstantString(TypeStr));
|
|
// int *offset;
|
|
uint64_t BaseOffset = ComputeIvarBaseOffset(CGM, OID, IVD);
|
|
uint64_t Offset = BaseOffset - superInstanceSize;
|
|
llvm::Constant *OffsetValue = llvm::ConstantInt::get(IntTy, Offset);
|
|
std::string OffsetName = GetIVarOffsetVariableName(classDecl, IVD);
|
|
llvm::GlobalVariable *OffsetVar = TheModule.getGlobalVariable(OffsetName);
|
|
if (OffsetVar)
|
|
OffsetVar->setInitializer(OffsetValue);
|
|
else
|
|
OffsetVar = new llvm::GlobalVariable(TheModule, IntTy,
|
|
false, llvm::GlobalValue::ExternalLinkage,
|
|
OffsetValue, OffsetName);
|
|
auto ivarVisibility =
|
|
(IVD->getAccessControl() == ObjCIvarDecl::Private ||
|
|
IVD->getAccessControl() == ObjCIvarDecl::Package ||
|
|
classDecl->getVisibility() == HiddenVisibility) ?
|
|
llvm::GlobalValue::HiddenVisibility :
|
|
llvm::GlobalValue::DefaultVisibility;
|
|
OffsetVar->setVisibility(ivarVisibility);
|
|
ivarBuilder.add(OffsetVar);
|
|
// Ivar size
|
|
ivarBuilder.addInt(Int32Ty,
|
|
CGM.getContext().getTypeSizeInChars(ivarTy).getQuantity());
|
|
// Alignment will be stored as a base-2 log of the alignment.
|
|
unsigned align =
|
|
llvm::Log2_32(Context.getTypeAlignInChars(ivarTy).getQuantity());
|
|
// Objects that require more than 2^64-byte alignment should be impossible!
|
|
assert(align < 64);
|
|
// uint32_t flags;
|
|
// Bits 0-1 are ownership.
|
|
// Bit 2 indicates an extended type encoding
|
|
// Bits 3-8 contain log2(aligment)
|
|
ivarBuilder.addInt(Int32Ty,
|
|
(align << 3) | (1<<2) |
|
|
FlagsForOwnership(ivarTy.getQualifiers().getObjCLifetime()));
|
|
ivarBuilder.finishAndAddTo(ivarArrayBuilder);
|
|
}
|
|
ivarArrayBuilder.finishAndAddTo(ivarListBuilder);
|
|
auto ivarList = ivarListBuilder.finishAndCreateGlobal(".objc_ivar_list",
|
|
CGM.getPointerAlign(), /*constant*/ false,
|
|
llvm::GlobalValue::PrivateLinkage);
|
|
classFields.add(ivarList);
|
|
}
|
|
// struct objc_method_list *methods
|
|
SmallVector<const ObjCMethodDecl*, 16> InstanceMethods;
|
|
InstanceMethods.insert(InstanceMethods.begin(), OID->instmeth_begin(),
|
|
OID->instmeth_end());
|
|
for (auto *propImpl : OID->property_impls())
|
|
if (propImpl->getPropertyImplementation() ==
|
|
ObjCPropertyImplDecl::Synthesize) {
|
|
auto addIfExists = [&](const ObjCMethodDecl *OMD) {
|
|
if (OMD && OMD->hasBody())
|
|
InstanceMethods.push_back(OMD);
|
|
};
|
|
addIfExists(propImpl->getGetterMethodDecl());
|
|
addIfExists(propImpl->getSetterMethodDecl());
|
|
}
|
|
|
|
if (InstanceMethods.size() == 0)
|
|
classFields.addNullPointer(PtrTy);
|
|
else
|
|
classFields.addBitCast(
|
|
GenerateMethodList(className, "", InstanceMethods, false),
|
|
PtrTy);
|
|
// void *dtable;
|
|
classFields.addNullPointer(PtrTy);
|
|
// IMP cxx_construct;
|
|
classFields.addNullPointer(PtrTy);
|
|
// IMP cxx_destruct;
|
|
classFields.addNullPointer(PtrTy);
|
|
// struct objc_class *subclass_list
|
|
classFields.addNullPointer(PtrTy);
|
|
// struct objc_class *sibling_class
|
|
classFields.addNullPointer(PtrTy);
|
|
// struct objc_protocol_list *protocols;
|
|
auto RuntimeProtocols = GetRuntimeProtocolList(classDecl->protocol_begin(),
|
|
classDecl->protocol_end());
|
|
SmallVector<llvm::Constant *, 16> Protocols;
|
|
for (const auto *I : RuntimeProtocols)
|
|
Protocols.push_back(
|
|
llvm::ConstantExpr::getBitCast(GenerateProtocolRef(I),
|
|
ProtocolPtrTy));
|
|
if (Protocols.empty())
|
|
classFields.addNullPointer(PtrTy);
|
|
else
|
|
classFields.add(GenerateProtocolList(Protocols));
|
|
// struct reference_list *extra_data;
|
|
classFields.addNullPointer(PtrTy);
|
|
// long abi_version;
|
|
classFields.addInt(LongTy, 0);
|
|
// struct objc_property_list *properties
|
|
classFields.add(GeneratePropertyList(OID, classDecl));
|
|
|
|
llvm::GlobalVariable *classStruct =
|
|
classFields.finishAndCreateGlobal(SymbolForClass(className),
|
|
CGM.getPointerAlign(), false, llvm::GlobalValue::ExternalLinkage);
|
|
|
|
auto *classRefSymbol = GetClassVar(className);
|
|
classRefSymbol->setSection(sectionName<ClassReferenceSection>());
|
|
classRefSymbol->setInitializer(llvm::ConstantExpr::getBitCast(classStruct, IdTy));
|
|
|
|
if (IsCOFF) {
|
|
// we can't import a class struct.
|
|
if (OID->getClassInterface()->hasAttr<DLLExportAttr>()) {
|
|
classStruct->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
|
|
cast<llvm::GlobalValue>(classRefSymbol)->setDLLStorageClass(llvm::GlobalValue::DLLExportStorageClass);
|
|
}
|
|
|
|
if (SuperClass) {
|
|
std::pair<llvm::GlobalVariable*, int> v{classStruct, 1};
|
|
EarlyInitList.emplace_back(std::string(SuperClass->getName()),
|
|
std::move(v));
|
|
}
|
|
|
|
}
|
|
|
|
|
|
// Resolve the class aliases, if they exist.
|
|
// FIXME: Class pointer aliases shouldn't exist!
|
|
if (ClassPtrAlias) {
|
|
ClassPtrAlias->replaceAllUsesWith(
|
|
llvm::ConstantExpr::getBitCast(classStruct, IdTy));
|
|
ClassPtrAlias->eraseFromParent();
|
|
ClassPtrAlias = nullptr;
|
|
}
|
|
if (auto Placeholder =
|
|
TheModule.getNamedGlobal(SymbolForClass(className)))
|
|
if (Placeholder != classStruct) {
|
|
Placeholder->replaceAllUsesWith(
|
|
llvm::ConstantExpr::getBitCast(classStruct, Placeholder->getType()));
|
|
Placeholder->eraseFromParent();
|
|
classStruct->setName(SymbolForClass(className));
|
|
}
|
|
if (MetaClassPtrAlias) {
|
|
MetaClassPtrAlias->replaceAllUsesWith(
|
|
llvm::ConstantExpr::getBitCast(metaclass, IdTy));
|
|
MetaClassPtrAlias->eraseFromParent();
|
|
MetaClassPtrAlias = nullptr;
|
|
}
|
|
assert(classStruct->getName() == SymbolForClass(className));
|
|
|
|
auto classInitRef = new llvm::GlobalVariable(TheModule,
|
|
classStruct->getType(), false, llvm::GlobalValue::ExternalLinkage,
|
|
classStruct, ManglePublicSymbol("OBJC_INIT_CLASS_") + className);
|
|
classInitRef->setSection(sectionName<ClassSection>());
|
|
CGM.addUsedGlobal(classInitRef);
|
|
|
|
EmittedClass = true;
|
|
}
|
|
public:
|
|
CGObjCGNUstep2(CodeGenModule &Mod) : CGObjCGNUstep(Mod, 10, 4, 2) {
|
|
MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy,
|
|
PtrToObjCSuperTy, SelectorTy);
|
|
// struct objc_property
|
|
// {
|
|
// const char *name;
|
|
// const char *attributes;
|
|
// const char *type;
|
|
// SEL getter;
|
|
// SEL setter;
|
|
// }
|
|
PropertyMetadataTy =
|
|
llvm::StructType::get(CGM.getLLVMContext(),
|
|
{ PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty });
|
|
}
|
|
|
|
};
|
|
|
|
const char *const CGObjCGNUstep2::SectionsBaseNames[8] =
|
|
{
|
|
"__objc_selectors",
|
|
"__objc_classes",
|
|
"__objc_class_refs",
|
|
"__objc_cats",
|
|
"__objc_protocols",
|
|
"__objc_protocol_refs",
|
|
"__objc_class_aliases",
|
|
"__objc_constant_string"
|
|
};
|
|
|
|
const char *const CGObjCGNUstep2::PECOFFSectionsBaseNames[8] =
|
|
{
|
|
".objcrt$SEL",
|
|
".objcrt$CLS",
|
|
".objcrt$CLR",
|
|
".objcrt$CAT",
|
|
".objcrt$PCL",
|
|
".objcrt$PCR",
|
|
".objcrt$CAL",
|
|
".objcrt$STR"
|
|
};
|
|
|
|
/// Support for the ObjFW runtime.
|
|
class CGObjCObjFW: public CGObjCGNU {
|
|
protected:
|
|
/// The GCC ABI message lookup function. Returns an IMP pointing to the
|
|
/// method implementation for this message.
|
|
LazyRuntimeFunction MsgLookupFn;
|
|
/// stret lookup function. While this does not seem to make sense at the
|
|
/// first look, this is required to call the correct forwarding function.
|
|
LazyRuntimeFunction MsgLookupFnSRet;
|
|
/// The GCC ABI superclass message lookup function. Takes a pointer to a
|
|
/// structure describing the receiver and the class, and a selector as
|
|
/// arguments. Returns the IMP for the corresponding method.
|
|
LazyRuntimeFunction MsgLookupSuperFn, MsgLookupSuperFnSRet;
|
|
|
|
llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver,
|
|
llvm::Value *cmd, llvm::MDNode *node,
|
|
MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *args[] = {
|
|
EnforceType(Builder, Receiver, IdTy),
|
|
EnforceType(Builder, cmd, SelectorTy) };
|
|
|
|
llvm::CallBase *imp;
|
|
if (CGM.ReturnTypeUsesSRet(MSI.CallInfo))
|
|
imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFnSRet, args);
|
|
else
|
|
imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args);
|
|
|
|
imp->setMetadata(msgSendMDKind, node);
|
|
return imp;
|
|
}
|
|
|
|
llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper,
|
|
llvm::Value *cmd, MessageSendInfo &MSI) override {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
llvm::Value *lookupArgs[] = {
|
|
EnforceType(Builder, ObjCSuper.getPointer(), PtrToObjCSuperTy), cmd,
|
|
};
|
|
|
|
if (CGM.ReturnTypeUsesSRet(MSI.CallInfo))
|
|
return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFnSRet, lookupArgs);
|
|
else
|
|
return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs);
|
|
}
|
|
|
|
llvm::Value *GetClassNamed(CodeGenFunction &CGF, const std::string &Name,
|
|
bool isWeak) override {
|
|
if (isWeak)
|
|
return CGObjCGNU::GetClassNamed(CGF, Name, isWeak);
|
|
|
|
EmitClassRef(Name);
|
|
std::string SymbolName = "_OBJC_CLASS_" + Name;
|
|
llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(SymbolName);
|
|
if (!ClassSymbol)
|
|
ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false,
|
|
llvm::GlobalValue::ExternalLinkage,
|
|
nullptr, SymbolName);
|
|
return ClassSymbol;
|
|
}
|
|
|
|
public:
|
|
CGObjCObjFW(CodeGenModule &Mod): CGObjCGNU(Mod, 9, 3) {
|
|
// IMP objc_msg_lookup(id, SEL);
|
|
MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy);
|
|
MsgLookupFnSRet.init(&CGM, "objc_msg_lookup_stret", IMPTy, IdTy,
|
|
SelectorTy);
|
|
// IMP objc_msg_lookup_super(struct objc_super*, SEL);
|
|
MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy,
|
|
PtrToObjCSuperTy, SelectorTy);
|
|
MsgLookupSuperFnSRet.init(&CGM, "objc_msg_lookup_super_stret", IMPTy,
|
|
PtrToObjCSuperTy, SelectorTy);
|
|
}
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
/// Emits a reference to a dummy variable which is emitted with each class.
|
|
/// This ensures that a linker error will be generated when trying to link
|
|
/// together modules where a referenced class is not defined.
|
|
void CGObjCGNU::EmitClassRef(const std::string &className) {
|
|
std::string symbolRef = "__objc_class_ref_" + className;
|
|
// Don't emit two copies of the same symbol
|
|
if (TheModule.getGlobalVariable(symbolRef))
|
|
return;
|
|
std::string symbolName = "__objc_class_name_" + className;
|
|
llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(symbolName);
|
|
if (!ClassSymbol) {
|
|
ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false,
|
|
llvm::GlobalValue::ExternalLinkage,
|
|
nullptr, symbolName);
|
|
}
|
|
new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true,
|
|
llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef);
|
|
}
|
|
|
|
CGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion,
|
|
unsigned protocolClassVersion, unsigned classABI)
|
|
: CGObjCRuntime(cgm), TheModule(CGM.getModule()),
|
|
VMContext(cgm.getLLVMContext()), ClassPtrAlias(nullptr),
|
|
MetaClassPtrAlias(nullptr), RuntimeVersion(runtimeABIVersion),
|
|
ProtocolVersion(protocolClassVersion), ClassABIVersion(classABI) {
|
|
|
|
msgSendMDKind = VMContext.getMDKindID("GNUObjCMessageSend");
|
|
usesSEHExceptions =
|
|
cgm.getContext().getTargetInfo().getTriple().isWindowsMSVCEnvironment();
|
|
|
|
CodeGenTypes &Types = CGM.getTypes();
|
|
IntTy = cast<llvm::IntegerType>(
|
|
Types.ConvertType(CGM.getContext().IntTy));
|
|
LongTy = cast<llvm::IntegerType>(
|
|
Types.ConvertType(CGM.getContext().LongTy));
|
|
SizeTy = cast<llvm::IntegerType>(
|
|
Types.ConvertType(CGM.getContext().getSizeType()));
|
|
PtrDiffTy = cast<llvm::IntegerType>(
|
|
Types.ConvertType(CGM.getContext().getPointerDiffType()));
|
|
BoolTy = CGM.getTypes().ConvertType(CGM.getContext().BoolTy);
|
|
|
|
Int8Ty = llvm::Type::getInt8Ty(VMContext);
|
|
// C string type. Used in lots of places.
|
|
PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty);
|
|
ProtocolPtrTy = llvm::PointerType::getUnqual(
|
|
Types.ConvertType(CGM.getContext().getObjCProtoType()));
|
|
|
|
Zeros[0] = llvm::ConstantInt::get(LongTy, 0);
|
|
Zeros[1] = Zeros[0];
|
|
NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty);
|
|
// Get the selector Type.
|
|
QualType selTy = CGM.getContext().getObjCSelType();
|
|
if (QualType() == selTy) {
|
|
SelectorTy = PtrToInt8Ty;
|
|
} else {
|
|
SelectorTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(selTy));
|
|
}
|
|
|
|
PtrToIntTy = llvm::PointerType::getUnqual(IntTy);
|
|
PtrTy = PtrToInt8Ty;
|
|
|
|
Int32Ty = llvm::Type::getInt32Ty(VMContext);
|
|
Int64Ty = llvm::Type::getInt64Ty(VMContext);
|
|
|
|
IntPtrTy =
|
|
CGM.getDataLayout().getPointerSizeInBits() == 32 ? Int32Ty : Int64Ty;
|
|
|
|
// Object type
|
|
QualType UnqualIdTy = CGM.getContext().getObjCIdType();
|
|
ASTIdTy = CanQualType();
|
|
if (UnqualIdTy != QualType()) {
|
|
ASTIdTy = CGM.getContext().getCanonicalType(UnqualIdTy);
|
|
IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy));
|
|
} else {
|
|
IdTy = PtrToInt8Ty;
|
|
}
|
|
PtrToIdTy = llvm::PointerType::getUnqual(IdTy);
|
|
ProtocolTy = llvm::StructType::get(IdTy,
|
|
PtrToInt8Ty, // name
|
|
PtrToInt8Ty, // protocols
|
|
PtrToInt8Ty, // instance methods
|
|
PtrToInt8Ty, // class methods
|
|
PtrToInt8Ty, // optional instance methods
|
|
PtrToInt8Ty, // optional class methods
|
|
PtrToInt8Ty, // properties
|
|
PtrToInt8Ty);// optional properties
|
|
|
|
// struct objc_property_gsv1
|
|
// {
|
|
// const char *name;
|
|
// char attributes;
|
|
// char attributes2;
|
|
// char unused1;
|
|
// char unused2;
|
|
// const char *getter_name;
|
|
// const char *getter_types;
|
|
// const char *setter_name;
|
|
// const char *setter_types;
|
|
// }
|
|
PropertyMetadataTy = llvm::StructType::get(CGM.getLLVMContext(), {
|
|
PtrToInt8Ty, Int8Ty, Int8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, PtrToInt8Ty,
|
|
PtrToInt8Ty, PtrToInt8Ty });
|
|
|
|
ObjCSuperTy = llvm::StructType::get(IdTy, IdTy);
|
|
PtrToObjCSuperTy = llvm::PointerType::getUnqual(ObjCSuperTy);
|
|
|
|
llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext);
|
|
|
|
// void objc_exception_throw(id);
|
|
ExceptionThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy);
|
|
ExceptionReThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy);
|
|
// int objc_sync_enter(id);
|
|
SyncEnterFn.init(&CGM, "objc_sync_enter", IntTy, IdTy);
|
|
// int objc_sync_exit(id);
|
|
SyncExitFn.init(&CGM, "objc_sync_exit", IntTy, IdTy);
|
|
|
|
// void objc_enumerationMutation (id)
|
|
EnumerationMutationFn.init(&CGM, "objc_enumerationMutation", VoidTy, IdTy);
|
|
|
|
// id objc_getProperty(id, SEL, ptrdiff_t, BOOL)
|
|
GetPropertyFn.init(&CGM, "objc_getProperty", IdTy, IdTy, SelectorTy,
|
|
PtrDiffTy, BoolTy);
|
|
// void objc_setProperty(id, SEL, ptrdiff_t, id, BOOL, BOOL)
|
|
SetPropertyFn.init(&CGM, "objc_setProperty", VoidTy, IdTy, SelectorTy,
|
|
PtrDiffTy, IdTy, BoolTy, BoolTy);
|
|
// void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL)
|
|
GetStructPropertyFn.init(&CGM, "objc_getPropertyStruct", VoidTy, PtrTy, PtrTy,
|
|
PtrDiffTy, BoolTy, BoolTy);
|
|
// void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL)
|
|
SetStructPropertyFn.init(&CGM, "objc_setPropertyStruct", VoidTy, PtrTy, PtrTy,
|
|
PtrDiffTy, BoolTy, BoolTy);
|
|
|
|
// IMP type
|
|
llvm::Type *IMPArgs[] = { IdTy, SelectorTy };
|
|
IMPTy = llvm::PointerType::getUnqual(llvm::FunctionType::get(IdTy, IMPArgs,
|
|
true));
|
|
|
|
const LangOptions &Opts = CGM.getLangOpts();
|
|
if ((Opts.getGC() != LangOptions::NonGC) || Opts.ObjCAutoRefCount)
|
|
RuntimeVersion = 10;
|
|
|
|
// Don't bother initialising the GC stuff unless we're compiling in GC mode
|
|
if (Opts.getGC() != LangOptions::NonGC) {
|
|
// This is a bit of an hack. We should sort this out by having a proper
|
|
// CGObjCGNUstep subclass for GC, but we may want to really support the old
|
|
// ABI and GC added in ObjectiveC2.framework, so we fudge it a bit for now
|
|
// Get selectors needed in GC mode
|
|
RetainSel = GetNullarySelector("retain", CGM.getContext());
|
|
ReleaseSel = GetNullarySelector("release", CGM.getContext());
|
|
AutoreleaseSel = GetNullarySelector("autorelease", CGM.getContext());
|
|
|
|
// Get functions needed in GC mode
|
|
|
|
// id objc_assign_ivar(id, id, ptrdiff_t);
|
|
IvarAssignFn.init(&CGM, "objc_assign_ivar", IdTy, IdTy, IdTy, PtrDiffTy);
|
|
// id objc_assign_strongCast (id, id*)
|
|
StrongCastAssignFn.init(&CGM, "objc_assign_strongCast", IdTy, IdTy,
|
|
PtrToIdTy);
|
|
// id objc_assign_global(id, id*);
|
|
GlobalAssignFn.init(&CGM, "objc_assign_global", IdTy, IdTy, PtrToIdTy);
|
|
// id objc_assign_weak(id, id*);
|
|
WeakAssignFn.init(&CGM, "objc_assign_weak", IdTy, IdTy, PtrToIdTy);
|
|
// id objc_read_weak(id*);
|
|
WeakReadFn.init(&CGM, "objc_read_weak", IdTy, PtrToIdTy);
|
|
// void *objc_memmove_collectable(void*, void *, size_t);
|
|
MemMoveFn.init(&CGM, "objc_memmove_collectable", PtrTy, PtrTy, PtrTy,
|
|
SizeTy);
|
|
}
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GetClassNamed(CodeGenFunction &CGF,
|
|
const std::string &Name, bool isWeak) {
|
|
llvm::Constant *ClassName = MakeConstantString(Name);
|
|
// With the incompatible ABI, this will need to be replaced with a direct
|
|
// reference to the class symbol. For the compatible nonfragile ABI we are
|
|
// still performing this lookup at run time but emitting the symbol for the
|
|
// class externally so that we can make the switch later.
|
|
//
|
|
// Libobjc2 contains an LLVM pass that replaces calls to objc_lookup_class
|
|
// with memoized versions or with static references if it's safe to do so.
|
|
if (!isWeak)
|
|
EmitClassRef(Name);
|
|
|
|
llvm::FunctionCallee ClassLookupFn = CGM.CreateRuntimeFunction(
|
|
llvm::FunctionType::get(IdTy, PtrToInt8Ty, true), "objc_lookup_class");
|
|
return CGF.EmitNounwindRuntimeCall(ClassLookupFn, ClassName);
|
|
}
|
|
|
|
// This has to perform the lookup every time, since posing and related
|
|
// techniques can modify the name -> class mapping.
|
|
llvm::Value *CGObjCGNU::GetClass(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *OID) {
|
|
auto *Value =
|
|
GetClassNamed(CGF, OID->getNameAsString(), OID->isWeakImported());
|
|
if (auto *ClassSymbol = dyn_cast<llvm::GlobalVariable>(Value))
|
|
CGM.setGVProperties(ClassSymbol, OID);
|
|
return Value;
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) {
|
|
auto *Value = GetClassNamed(CGF, "NSAutoreleasePool", false);
|
|
if (CGM.getTriple().isOSBinFormatCOFF()) {
|
|
if (auto *ClassSymbol = dyn_cast<llvm::GlobalVariable>(Value)) {
|
|
IdentifierInfo &II = CGF.CGM.getContext().Idents.get("NSAutoreleasePool");
|
|
TranslationUnitDecl *TUDecl = CGM.getContext().getTranslationUnitDecl();
|
|
DeclContext *DC = TranslationUnitDecl::castToDeclContext(TUDecl);
|
|
|
|
const VarDecl *VD = nullptr;
|
|
for (const auto *Result : DC->lookup(&II))
|
|
if ((VD = dyn_cast<VarDecl>(Result)))
|
|
break;
|
|
|
|
CGM.setGVProperties(ClassSymbol, VD);
|
|
}
|
|
}
|
|
return Value;
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GetTypedSelector(CodeGenFunction &CGF, Selector Sel,
|
|
const std::string &TypeEncoding) {
|
|
SmallVectorImpl<TypedSelector> &Types = SelectorTable[Sel];
|
|
llvm::GlobalAlias *SelValue = nullptr;
|
|
|
|
for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(),
|
|
e = Types.end() ; i!=e ; i++) {
|
|
if (i->first == TypeEncoding) {
|
|
SelValue = i->second;
|
|
break;
|
|
}
|
|
}
|
|
if (!SelValue) {
|
|
SelValue = llvm::GlobalAlias::create(SelectorTy->getPointerElementType(), 0,
|
|
llvm::GlobalValue::PrivateLinkage,
|
|
".objc_selector_" + Sel.getAsString(),
|
|
&TheModule);
|
|
Types.emplace_back(TypeEncoding, SelValue);
|
|
}
|
|
|
|
return SelValue;
|
|
}
|
|
|
|
Address CGObjCGNU::GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) {
|
|
llvm::Value *SelValue = GetSelector(CGF, Sel);
|
|
|
|
// Store it to a temporary. Does this satisfy the semantics of
|
|
// GetAddrOfSelector? Hopefully.
|
|
Address tmp = CGF.CreateTempAlloca(SelValue->getType(),
|
|
CGF.getPointerAlign());
|
|
CGF.Builder.CreateStore(SelValue, tmp);
|
|
return tmp;
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, Selector Sel) {
|
|
return GetTypedSelector(CGF, Sel, std::string());
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF,
|
|
const ObjCMethodDecl *Method) {
|
|
std::string SelTypes = CGM.getContext().getObjCEncodingForMethodDecl(Method);
|
|
return GetTypedSelector(CGF, Method->getSelector(), SelTypes);
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GetEHType(QualType T) {
|
|
if (T->isObjCIdType() || T->isObjCQualifiedIdType()) {
|
|
// With the old ABI, there was only one kind of catchall, which broke
|
|
// foreign exceptions. With the new ABI, we use __objc_id_typeinfo as
|
|
// a pointer indicating object catchalls, and NULL to indicate real
|
|
// catchalls
|
|
if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
|
|
return MakeConstantString("@id");
|
|
} else {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
// All other types should be Objective-C interface pointer types.
|
|
const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>();
|
|
assert(OPT && "Invalid @catch type.");
|
|
const ObjCInterfaceDecl *IDecl = OPT->getObjectType()->getInterface();
|
|
assert(IDecl && "Invalid @catch type.");
|
|
return MakeConstantString(IDecl->getIdentifier()->getName());
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNUstep::GetEHType(QualType T) {
|
|
if (usesSEHExceptions)
|
|
return CGM.getCXXABI().getAddrOfRTTIDescriptor(T);
|
|
|
|
if (!CGM.getLangOpts().CPlusPlus)
|
|
return CGObjCGNU::GetEHType(T);
|
|
|
|
// For Objective-C++, we want to provide the ability to catch both C++ and
|
|
// Objective-C objects in the same function.
|
|
|
|
// There's a particular fixed type info for 'id'.
|
|
if (T->isObjCIdType() ||
|
|
T->isObjCQualifiedIdType()) {
|
|
llvm::Constant *IDEHType =
|
|
CGM.getModule().getGlobalVariable("__objc_id_type_info");
|
|
if (!IDEHType)
|
|
IDEHType =
|
|
new llvm::GlobalVariable(CGM.getModule(), PtrToInt8Ty,
|
|
false,
|
|
llvm::GlobalValue::ExternalLinkage,
|
|
nullptr, "__objc_id_type_info");
|
|
return llvm::ConstantExpr::getBitCast(IDEHType, PtrToInt8Ty);
|
|
}
|
|
|
|
const ObjCObjectPointerType *PT =
|
|
T->getAs<ObjCObjectPointerType>();
|
|
assert(PT && "Invalid @catch type.");
|
|
const ObjCInterfaceType *IT = PT->getInterfaceType();
|
|
assert(IT && "Invalid @catch type.");
|
|
std::string className =
|
|
std::string(IT->getDecl()->getIdentifier()->getName());
|
|
|
|
std::string typeinfoName = "__objc_eh_typeinfo_" + className;
|
|
|
|
// Return the existing typeinfo if it exists
|
|
llvm::Constant *typeinfo = TheModule.getGlobalVariable(typeinfoName);
|
|
if (typeinfo)
|
|
return llvm::ConstantExpr::getBitCast(typeinfo, PtrToInt8Ty);
|
|
|
|
// Otherwise create it.
|
|
|
|
// vtable for gnustep::libobjc::__objc_class_type_info
|
|
// It's quite ugly hard-coding this. Ideally we'd generate it using the host
|
|
// platform's name mangling.
|
|
const char *vtableName = "_ZTVN7gnustep7libobjc22__objc_class_type_infoE";
|
|
auto *Vtable = TheModule.getGlobalVariable(vtableName);
|
|
if (!Vtable) {
|
|
Vtable = new llvm::GlobalVariable(TheModule, PtrToInt8Ty, true,
|
|
llvm::GlobalValue::ExternalLinkage,
|
|
nullptr, vtableName);
|
|
}
|
|
llvm::Constant *Two = llvm::ConstantInt::get(IntTy, 2);
|
|
auto *BVtable = llvm::ConstantExpr::getBitCast(
|
|
llvm::ConstantExpr::getGetElementPtr(Vtable->getValueType(), Vtable, Two),
|
|
PtrToInt8Ty);
|
|
|
|
llvm::Constant *typeName =
|
|
ExportUniqueString(className, "__objc_eh_typename_");
|
|
|
|
ConstantInitBuilder builder(CGM);
|
|
auto fields = builder.beginStruct();
|
|
fields.add(BVtable);
|
|
fields.add(typeName);
|
|
llvm::Constant *TI =
|
|
fields.finishAndCreateGlobal("__objc_eh_typeinfo_" + className,
|
|
CGM.getPointerAlign(),
|
|
/*constant*/ false,
|
|
llvm::GlobalValue::LinkOnceODRLinkage);
|
|
return llvm::ConstantExpr::getBitCast(TI, PtrToInt8Ty);
|
|
}
|
|
|
|
/// Generate an NSConstantString object.
|
|
ConstantAddress CGObjCGNU::GenerateConstantString(const StringLiteral *SL) {
|
|
|
|
std::string Str = SL->getString().str();
|
|
CharUnits Align = CGM.getPointerAlign();
|
|
|
|
// Look for an existing one
|
|
llvm::StringMap<llvm::Constant*>::iterator old = ObjCStrings.find(Str);
|
|
if (old != ObjCStrings.end())
|
|
return ConstantAddress(old->getValue(), Int8Ty, Align);
|
|
|
|
StringRef StringClass = CGM.getLangOpts().ObjCConstantStringClass;
|
|
|
|
if (StringClass.empty()) StringClass = "NSConstantString";
|
|
|
|
std::string Sym = "_OBJC_CLASS_";
|
|
Sym += StringClass;
|
|
|
|
llvm::Constant *isa = TheModule.getNamedGlobal(Sym);
|
|
|
|
if (!isa)
|
|
isa = new llvm::GlobalVariable(TheModule, IdTy, /* isConstant */false,
|
|
llvm::GlobalValue::ExternalWeakLinkage, nullptr, Sym);
|
|
else if (isa->getType() != PtrToIdTy)
|
|
isa = llvm::ConstantExpr::getBitCast(isa, PtrToIdTy);
|
|
|
|
ConstantInitBuilder Builder(CGM);
|
|
auto Fields = Builder.beginStruct();
|
|
Fields.add(isa);
|
|
Fields.add(MakeConstantString(Str));
|
|
Fields.addInt(IntTy, Str.size());
|
|
llvm::Constant *ObjCStr =
|
|
Fields.finishAndCreateGlobal(".objc_str", Align);
|
|
ObjCStr = llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty);
|
|
ObjCStrings[Str] = ObjCStr;
|
|
ConstantStrings.push_back(ObjCStr);
|
|
return ConstantAddress(ObjCStr, Int8Ty, Align);
|
|
}
|
|
|
|
///Generates a message send where the super is the receiver. This is a message
|
|
///send to self with special delivery semantics indicating which class's method
|
|
///should be called.
|
|
RValue
|
|
CGObjCGNU::GenerateMessageSendSuper(CodeGenFunction &CGF,
|
|
ReturnValueSlot Return,
|
|
QualType ResultType,
|
|
Selector Sel,
|
|
const ObjCInterfaceDecl *Class,
|
|
bool isCategoryImpl,
|
|
llvm::Value *Receiver,
|
|
bool IsClassMessage,
|
|
const CallArgList &CallArgs,
|
|
const ObjCMethodDecl *Method) {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
|
|
if (Sel == RetainSel || Sel == AutoreleaseSel) {
|
|
return RValue::get(EnforceType(Builder, Receiver,
|
|
CGM.getTypes().ConvertType(ResultType)));
|
|
}
|
|
if (Sel == ReleaseSel) {
|
|
return RValue::get(nullptr);
|
|
}
|
|
}
|
|
|
|
llvm::Value *cmd = GetSelector(CGF, Sel);
|
|
CallArgList ActualArgs;
|
|
|
|
ActualArgs.add(RValue::get(EnforceType(Builder, Receiver, IdTy)), ASTIdTy);
|
|
ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType());
|
|
ActualArgs.addFrom(CallArgs);
|
|
|
|
MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs);
|
|
|
|
llvm::Value *ReceiverClass = nullptr;
|
|
bool isV2ABI = isRuntime(ObjCRuntime::GNUstep, 2);
|
|
if (isV2ABI) {
|
|
ReceiverClass = GetClassNamed(CGF,
|
|
Class->getSuperClass()->getNameAsString(), /*isWeak*/false);
|
|
if (IsClassMessage) {
|
|
// Load the isa pointer of the superclass is this is a class method.
|
|
ReceiverClass = Builder.CreateBitCast(ReceiverClass,
|
|
llvm::PointerType::getUnqual(IdTy));
|
|
ReceiverClass =
|
|
Builder.CreateAlignedLoad(IdTy, ReceiverClass, CGF.getPointerAlign());
|
|
}
|
|
ReceiverClass = EnforceType(Builder, ReceiverClass, IdTy);
|
|
} else {
|
|
if (isCategoryImpl) {
|
|
llvm::FunctionCallee classLookupFunction = nullptr;
|
|
if (IsClassMessage) {
|
|
classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
|
|
IdTy, PtrTy, true), "objc_get_meta_class");
|
|
} else {
|
|
classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get(
|
|
IdTy, PtrTy, true), "objc_get_class");
|
|
}
|
|
ReceiverClass = Builder.CreateCall(classLookupFunction,
|
|
MakeConstantString(Class->getNameAsString()));
|
|
} else {
|
|
// Set up global aliases for the metaclass or class pointer if they do not
|
|
// already exist. These will are forward-references which will be set to
|
|
// pointers to the class and metaclass structure created for the runtime
|
|
// load function. To send a message to super, we look up the value of the
|
|
// super_class pointer from either the class or metaclass structure.
|
|
if (IsClassMessage) {
|
|
if (!MetaClassPtrAlias) {
|
|
MetaClassPtrAlias = llvm::GlobalAlias::create(
|
|
IdTy->getPointerElementType(), 0,
|
|
llvm::GlobalValue::InternalLinkage,
|
|
".objc_metaclass_ref" + Class->getNameAsString(), &TheModule);
|
|
}
|
|
ReceiverClass = MetaClassPtrAlias;
|
|
} else {
|
|
if (!ClassPtrAlias) {
|
|
ClassPtrAlias = llvm::GlobalAlias::create(
|
|
IdTy->getPointerElementType(), 0,
|
|
llvm::GlobalValue::InternalLinkage,
|
|
".objc_class_ref" + Class->getNameAsString(), &TheModule);
|
|
}
|
|
ReceiverClass = ClassPtrAlias;
|
|
}
|
|
}
|
|
// Cast the pointer to a simplified version of the class structure
|
|
llvm::Type *CastTy = llvm::StructType::get(IdTy, IdTy);
|
|
ReceiverClass = Builder.CreateBitCast(ReceiverClass,
|
|
llvm::PointerType::getUnqual(CastTy));
|
|
// Get the superclass pointer
|
|
ReceiverClass = Builder.CreateStructGEP(CastTy, ReceiverClass, 1);
|
|
// Load the superclass pointer
|
|
ReceiverClass =
|
|
Builder.CreateAlignedLoad(IdTy, ReceiverClass, CGF.getPointerAlign());
|
|
}
|
|
// Construct the structure used to look up the IMP
|
|
llvm::StructType *ObjCSuperTy =
|
|
llvm::StructType::get(Receiver->getType(), IdTy);
|
|
|
|
Address ObjCSuper = CGF.CreateTempAlloca(ObjCSuperTy,
|
|
CGF.getPointerAlign());
|
|
|
|
Builder.CreateStore(Receiver, Builder.CreateStructGEP(ObjCSuper, 0));
|
|
Builder.CreateStore(ReceiverClass, Builder.CreateStructGEP(ObjCSuper, 1));
|
|
|
|
ObjCSuper = EnforceType(Builder, ObjCSuper, PtrToObjCSuperTy);
|
|
|
|
// Get the IMP
|
|
llvm::Value *imp = LookupIMPSuper(CGF, ObjCSuper, cmd, MSI);
|
|
imp = EnforceType(Builder, imp, MSI.MessengerType);
|
|
|
|
llvm::Metadata *impMD[] = {
|
|
llvm::MDString::get(VMContext, Sel.getAsString()),
|
|
llvm::MDString::get(VMContext, Class->getSuperClass()->getNameAsString()),
|
|
llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
|
|
llvm::Type::getInt1Ty(VMContext), IsClassMessage))};
|
|
llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD);
|
|
|
|
CGCallee callee(CGCalleeInfo(), imp);
|
|
|
|
llvm::CallBase *call;
|
|
RValue msgRet = CGF.EmitCall(MSI.CallInfo, callee, Return, ActualArgs, &call);
|
|
call->setMetadata(msgSendMDKind, node);
|
|
return msgRet;
|
|
}
|
|
|
|
/// Generate code for a message send expression.
|
|
RValue
|
|
CGObjCGNU::GenerateMessageSend(CodeGenFunction &CGF,
|
|
ReturnValueSlot Return,
|
|
QualType ResultType,
|
|
Selector Sel,
|
|
llvm::Value *Receiver,
|
|
const CallArgList &CallArgs,
|
|
const ObjCInterfaceDecl *Class,
|
|
const ObjCMethodDecl *Method) {
|
|
CGBuilderTy &Builder = CGF.Builder;
|
|
|
|
// Strip out message sends to retain / release in GC mode
|
|
if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) {
|
|
if (Sel == RetainSel || Sel == AutoreleaseSel) {
|
|
return RValue::get(EnforceType(Builder, Receiver,
|
|
CGM.getTypes().ConvertType(ResultType)));
|
|
}
|
|
if (Sel == ReleaseSel) {
|
|
return RValue::get(nullptr);
|
|
}
|
|
}
|
|
|
|
IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy));
|
|
llvm::Value *cmd;
|
|
if (Method)
|
|
cmd = GetSelector(CGF, Method);
|
|
else
|
|
cmd = GetSelector(CGF, Sel);
|
|
cmd = EnforceType(Builder, cmd, SelectorTy);
|
|
Receiver = EnforceType(Builder, Receiver, IdTy);
|
|
|
|
llvm::Metadata *impMD[] = {
|
|
llvm::MDString::get(VMContext, Sel.getAsString()),
|
|
llvm::MDString::get(VMContext, Class ? Class->getNameAsString() : ""),
|
|
llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
|
|
llvm::Type::getInt1Ty(VMContext), Class != nullptr))};
|
|
llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD);
|
|
|
|
CallArgList ActualArgs;
|
|
ActualArgs.add(RValue::get(Receiver), ASTIdTy);
|
|
ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType());
|
|
ActualArgs.addFrom(CallArgs);
|
|
|
|
MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs);
|
|
|
|
// Message sends are expected to return a zero value when the
|
|
// receiver is nil. At one point, this was only guaranteed for
|
|
// simple integer and pointer types, but expectations have grown
|
|
// over time.
|
|
//
|
|
// Given a nil receiver, the GNU runtime's message lookup will
|
|
// return a stub function that simply sets various return-value
|
|
// registers to zero and then returns. That's good enough for us
|
|
// if and only if (1) the calling conventions of that stub are
|
|
// compatible with the signature we're using and (2) the registers
|
|
// it sets are sufficient to produce a zero value of the return type.
|
|
// Rather than doing a whole target-specific analysis, we assume it
|
|
// only works for void, integer, and pointer types, and in all
|
|
// other cases we do an explicit nil check is emitted code. In
|
|
// addition to ensuring we produe a zero value for other types, this
|
|
// sidesteps the few outright CC incompatibilities we know about that
|
|
// could otherwise lead to crashes, like when a method is expected to
|
|
// return on the x87 floating point stack or adjust the stack pointer
|
|
// because of an indirect return.
|
|
bool hasParamDestroyedInCallee = false;
|
|
bool requiresExplicitZeroResult = false;
|
|
bool requiresNilReceiverCheck = [&] {
|
|
// We never need a check if we statically know the receiver isn't nil.
|
|
if (!canMessageReceiverBeNull(CGF, Method, /*IsSuper*/ false,
|
|
Class, Receiver))
|
|
return false;
|
|
|
|
// If there's a consumed argument, we need a nil check.
|
|
if (Method && Method->hasParamDestroyedInCallee()) {
|
|
hasParamDestroyedInCallee = true;
|
|
}
|
|
|
|
// If the return value isn't flagged as unused, and the result
|
|
// type isn't in our narrow set where we assume compatibility,
|
|
// we need a nil check to ensure a nil value.
|
|
if (!Return.isUnused()) {
|
|
if (ResultType->isVoidType()) {
|
|
// void results are definitely okay.
|
|
} else if (ResultType->hasPointerRepresentation() &&
|
|
CGM.getTypes().isZeroInitializable(ResultType)) {
|
|
// Pointer types should be fine as long as they have
|
|
// bitwise-zero null pointers. But do we need to worry
|
|
// about unusual address spaces?
|
|
} else if (ResultType->isIntegralOrEnumerationType()) {
|
|
// Bitwise zero should always be zero for integral types.
|
|
// FIXME: we probably need a size limit here, but we've
|
|
// never imposed one before
|
|
} else {
|
|
// Otherwise, use an explicit check just to be sure.
|
|
requiresExplicitZeroResult = true;
|
|
}
|
|
}
|
|
|
|
return hasParamDestroyedInCallee || requiresExplicitZeroResult;
|
|
}();
|
|
|
|
// We will need to explicitly zero-initialize an aggregate result slot
|
|
// if we generally require explicit zeroing and we have an aggregate
|
|
// result.
|
|
bool requiresExplicitAggZeroing =
|
|
requiresExplicitZeroResult && CGF.hasAggregateEvaluationKind(ResultType);
|
|
|
|
// The block we're going to end up in after any message send or nil path.
|
|
llvm::BasicBlock *continueBB = nullptr;
|
|
// The block that eventually branched to continueBB along the nil path.
|
|
llvm::BasicBlock *nilPathBB = nullptr;
|
|
// The block to do explicit work in along the nil path, if necessary.
|
|
llvm::BasicBlock *nilCleanupBB = nullptr;
|
|
|
|
// Emit the nil-receiver check.
|
|
if (requiresNilReceiverCheck) {
|
|
llvm::BasicBlock *messageBB = CGF.createBasicBlock("msgSend");
|
|
continueBB = CGF.createBasicBlock("continue");
|
|
|
|
// If we need to zero-initialize an aggregate result or destroy
|
|
// consumed arguments, we'll need a separate cleanup block.
|
|
// Otherwise we can just branch directly to the continuation block.
|
|
if (requiresExplicitAggZeroing || hasParamDestroyedInCallee) {
|
|
nilCleanupBB = CGF.createBasicBlock("nilReceiverCleanup");
|
|
} else {
|
|
nilPathBB = Builder.GetInsertBlock();
|
|
}
|
|
|
|
llvm::Value *isNil = Builder.CreateICmpEQ(Receiver,
|
|
llvm::Constant::getNullValue(Receiver->getType()));
|
|
Builder.CreateCondBr(isNil, nilCleanupBB ? nilCleanupBB : continueBB,
|
|
messageBB);
|
|
CGF.EmitBlock(messageBB);
|
|
}
|
|
|
|
// Get the IMP to call
|
|
llvm::Value *imp;
|
|
|
|
// If we have non-legacy dispatch specified, we try using the objc_msgSend()
|
|
// functions. These are not supported on all platforms (or all runtimes on a
|
|
// given platform), so we
|
|
switch (CGM.getCodeGenOpts().getObjCDispatchMethod()) {
|
|
case CodeGenOptions::Legacy:
|
|
imp = LookupIMP(CGF, Receiver, cmd, node, MSI);
|
|
break;
|
|
case CodeGenOptions::Mixed:
|
|
case CodeGenOptions::NonLegacy:
|
|
if (CGM.ReturnTypeUsesFPRet(ResultType)) {
|
|
imp =
|
|
CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
|
|
"objc_msgSend_fpret")
|
|
.getCallee();
|
|
} else if (CGM.ReturnTypeUsesSRet(MSI.CallInfo)) {
|
|
// The actual types here don't matter - we're going to bitcast the
|
|
// function anyway
|
|
imp =
|
|
CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true),
|
|
"objc_msgSend_stret")
|
|
.getCallee();
|
|
} else {
|
|
imp = CGM.CreateRuntimeFunction(
|
|
llvm::FunctionType::get(IdTy, IdTy, true), "objc_msgSend")
|
|
.getCallee();
|
|
}
|
|
}
|
|
|
|
// Reset the receiver in case the lookup modified it
|
|
ActualArgs[0] = CallArg(RValue::get(Receiver), ASTIdTy);
|
|
|
|
imp = EnforceType(Builder, imp, MSI.MessengerType);
|
|
|
|
llvm::CallBase *call;
|
|
CGCallee callee(CGCalleeInfo(), imp);
|
|
RValue msgRet = CGF.EmitCall(MSI.CallInfo, callee, Return, ActualArgs, &call);
|
|
call->setMetadata(msgSendMDKind, node);
|
|
|
|
if (requiresNilReceiverCheck) {
|
|
llvm::BasicBlock *nonNilPathBB = CGF.Builder.GetInsertBlock();
|
|
CGF.Builder.CreateBr(continueBB);
|
|
|
|
// Emit the nil path if we decided it was necessary above.
|
|
if (nilCleanupBB) {
|
|
CGF.EmitBlock(nilCleanupBB);
|
|
|
|
if (hasParamDestroyedInCallee) {
|
|
destroyCalleeDestroyedArguments(CGF, Method, CallArgs);
|
|
}
|
|
|
|
if (requiresExplicitAggZeroing) {
|
|
assert(msgRet.isAggregate());
|
|
Address addr = msgRet.getAggregateAddress();
|
|
CGF.EmitNullInitialization(addr, ResultType);
|
|
}
|
|
|
|
nilPathBB = CGF.Builder.GetInsertBlock();
|
|
CGF.Builder.CreateBr(continueBB);
|
|
}
|
|
|
|
// Enter the continuation block and emit a phi if required.
|
|
CGF.EmitBlock(continueBB);
|
|
if (msgRet.isScalar()) {
|
|
llvm::Value *v = msgRet.getScalarVal();
|
|
llvm::PHINode *phi = Builder.CreatePHI(v->getType(), 2);
|
|
phi->addIncoming(v, nonNilPathBB);
|
|
phi->addIncoming(CGM.EmitNullConstant(ResultType), nilPathBB);
|
|
msgRet = RValue::get(phi);
|
|
} else if (msgRet.isAggregate()) {
|
|
// Aggregate zeroing is handled in nilCleanupBB when it's required.
|
|
} else /* isComplex() */ {
|
|
std::pair<llvm::Value*,llvm::Value*> v = msgRet.getComplexVal();
|
|
llvm::PHINode *phi = Builder.CreatePHI(v.first->getType(), 2);
|
|
phi->addIncoming(v.first, nonNilPathBB);
|
|
phi->addIncoming(llvm::Constant::getNullValue(v.first->getType()),
|
|
nilPathBB);
|
|
llvm::PHINode *phi2 = Builder.CreatePHI(v.second->getType(), 2);
|
|
phi2->addIncoming(v.second, nonNilPathBB);
|
|
phi2->addIncoming(llvm::Constant::getNullValue(v.second->getType()),
|
|
nilPathBB);
|
|
msgRet = RValue::getComplex(phi, phi2);
|
|
}
|
|
}
|
|
return msgRet;
|
|
}
|
|
|
|
/// Generates a MethodList. Used in construction of a objc_class and
|
|
/// objc_category structures.
|
|
llvm::Constant *CGObjCGNU::
|
|
GenerateMethodList(StringRef ClassName,
|
|
StringRef CategoryName,
|
|
ArrayRef<const ObjCMethodDecl*> Methods,
|
|
bool isClassMethodList) {
|
|
if (Methods.empty())
|
|
return NULLPtr;
|
|
|
|
ConstantInitBuilder Builder(CGM);
|
|
|
|
auto MethodList = Builder.beginStruct();
|
|
MethodList.addNullPointer(CGM.Int8PtrTy);
|
|
MethodList.addInt(Int32Ty, Methods.size());
|
|
|
|
// Get the method structure type.
|
|
llvm::StructType *ObjCMethodTy =
|
|
llvm::StructType::get(CGM.getLLVMContext(), {
|
|
PtrToInt8Ty, // Really a selector, but the runtime creates it us.
|
|
PtrToInt8Ty, // Method types
|
|
IMPTy // Method pointer
|
|
});
|
|
bool isV2ABI = isRuntime(ObjCRuntime::GNUstep, 2);
|
|
if (isV2ABI) {
|
|
// size_t size;
|
|
llvm::DataLayout td(&TheModule);
|
|
MethodList.addInt(SizeTy, td.getTypeSizeInBits(ObjCMethodTy) /
|
|
CGM.getContext().getCharWidth());
|
|
ObjCMethodTy =
|
|
llvm::StructType::get(CGM.getLLVMContext(), {
|
|
IMPTy, // Method pointer
|
|
PtrToInt8Ty, // Selector
|
|
PtrToInt8Ty // Extended type encoding
|
|
});
|
|
} else {
|
|
ObjCMethodTy =
|
|
llvm::StructType::get(CGM.getLLVMContext(), {
|
|
PtrToInt8Ty, // Really a selector, but the runtime creates it us.
|
|
PtrToInt8Ty, // Method types
|
|
IMPTy // Method pointer
|
|
});
|
|
}
|
|
auto MethodArray = MethodList.beginArray();
|
|
ASTContext &Context = CGM.getContext();
|
|
for (const auto *OMD : Methods) {
|
|
llvm::Constant *FnPtr =
|
|
TheModule.getFunction(getSymbolNameForMethod(OMD));
|
|
assert(FnPtr && "Can't generate metadata for method that doesn't exist");
|
|
auto Method = MethodArray.beginStruct(ObjCMethodTy);
|
|
if (isV2ABI) {
|
|
Method.addBitCast(FnPtr, IMPTy);
|
|
Method.add(GetConstantSelector(OMD->getSelector(),
|
|
Context.getObjCEncodingForMethodDecl(OMD)));
|
|
Method.add(MakeConstantString(Context.getObjCEncodingForMethodDecl(OMD, true)));
|
|
} else {
|
|
Method.add(MakeConstantString(OMD->getSelector().getAsString()));
|
|
Method.add(MakeConstantString(Context.getObjCEncodingForMethodDecl(OMD)));
|
|
Method.addBitCast(FnPtr, IMPTy);
|
|
}
|
|
Method.finishAndAddTo(MethodArray);
|
|
}
|
|
MethodArray.finishAndAddTo(MethodList);
|
|
|
|
// Create an instance of the structure
|
|
return MethodList.finishAndCreateGlobal(".objc_method_list",
|
|
CGM.getPointerAlign());
|
|
}
|
|
|
|
/// Generates an IvarList. Used in construction of a objc_class.
|
|
llvm::Constant *CGObjCGNU::
|
|
GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames,
|
|
ArrayRef<llvm::Constant *> IvarTypes,
|
|
ArrayRef<llvm::Constant *> IvarOffsets,
|
|
ArrayRef<llvm::Constant *> IvarAlign,
|
|
ArrayRef<Qualifiers::ObjCLifetime> IvarOwnership) {
|
|
if (IvarNames.empty())
|
|
return NULLPtr;
|
|
|
|
ConstantInitBuilder Builder(CGM);
|
|
|
|
// Structure containing array count followed by array.
|
|
auto IvarList = Builder.beginStruct();
|
|
IvarList.addInt(IntTy, (int)IvarNames.size());
|
|
|
|
// Get the ivar structure type.
|
|
llvm::StructType *ObjCIvarTy =
|
|
llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, IntTy);
|
|
|
|
// Array of ivar structures.
|
|
auto Ivars = IvarList.beginArray(ObjCIvarTy);
|
|
for (unsigned int i = 0, e = IvarNames.size() ; i < e ; i++) {
|
|
auto Ivar = Ivars.beginStruct(ObjCIvarTy);
|
|
Ivar.add(IvarNames[i]);
|
|
Ivar.add(IvarTypes[i]);
|
|
Ivar.add(IvarOffsets[i]);
|
|
Ivar.finishAndAddTo(Ivars);
|
|
}
|
|
Ivars.finishAndAddTo(IvarList);
|
|
|
|
// Create an instance of the structure
|
|
return IvarList.finishAndCreateGlobal(".objc_ivar_list",
|
|
CGM.getPointerAlign());
|
|
}
|
|
|
|
/// Generate a class structure
|
|
llvm::Constant *CGObjCGNU::GenerateClassStructure(
|
|
llvm::Constant *MetaClass,
|
|
llvm::Constant *SuperClass,
|
|
unsigned info,
|
|
const char *Name,
|
|
llvm::Constant *Version,
|
|
llvm::Constant *InstanceSize,
|
|
llvm::Constant *IVars,
|
|
llvm::Constant *Methods,
|
|
llvm::Constant *Protocols,
|
|
llvm::Constant *IvarOffsets,
|
|
llvm::Constant *Properties,
|
|
llvm::Constant *StrongIvarBitmap,
|
|
llvm::Constant *WeakIvarBitmap,
|
|
bool isMeta) {
|
|
// Set up the class structure
|
|
// Note: Several of these are char*s when they should be ids. This is
|
|
// because the runtime performs this translation on load.
|
|
//
|
|
// Fields marked New ABI are part of the GNUstep runtime. We emit them
|
|
// anyway; the classes will still work with the GNU runtime, they will just
|
|
// be ignored.
|
|
llvm::StructType *ClassTy = llvm::StructType::get(
|
|
PtrToInt8Ty, // isa
|
|
PtrToInt8Ty, // super_class
|
|
PtrToInt8Ty, // name
|
|
LongTy, // version
|
|
LongTy, // info
|
|
LongTy, // instance_size
|
|
IVars->getType(), // ivars
|
|
Methods->getType(), // methods
|
|
// These are all filled in by the runtime, so we pretend
|
|
PtrTy, // dtable
|
|
PtrTy, // subclass_list
|
|
PtrTy, // sibling_class
|
|
PtrTy, // protocols
|
|
PtrTy, // gc_object_type
|
|
// New ABI:
|
|
LongTy, // abi_version
|
|
IvarOffsets->getType(), // ivar_offsets
|
|
Properties->getType(), // properties
|
|
IntPtrTy, // strong_pointers
|
|
IntPtrTy // weak_pointers
|
|
);
|
|
|
|
ConstantInitBuilder Builder(CGM);
|
|
auto Elements = Builder.beginStruct(ClassTy);
|
|
|
|
// Fill in the structure
|
|
|
|
// isa
|
|
Elements.addBitCast(MetaClass, PtrToInt8Ty);
|
|
// super_class
|
|
Elements.add(SuperClass);
|
|
// name
|
|
Elements.add(MakeConstantString(Name, ".class_name"));
|
|
// version
|
|
Elements.addInt(LongTy, 0);
|
|
// info
|
|
Elements.addInt(LongTy, info);
|
|
// instance_size
|
|
if (isMeta) {
|
|
llvm::DataLayout td(&TheModule);
|
|
Elements.addInt(LongTy,
|
|
td.getTypeSizeInBits(ClassTy) /
|
|
CGM.getContext().getCharWidth());
|
|
} else
|
|
Elements.add(InstanceSize);
|
|
// ivars
|
|
Elements.add(IVars);
|
|
// methods
|
|
Elements.add(Methods);
|
|
// These are all filled in by the runtime, so we pretend
|
|
// dtable
|
|
Elements.add(NULLPtr);
|
|
// subclass_list
|
|
Elements.add(NULLPtr);
|
|
// sibling_class
|
|
Elements.add(NULLPtr);
|
|
// protocols
|
|
Elements.addBitCast(Protocols, PtrTy);
|
|
// gc_object_type
|
|
Elements.add(NULLPtr);
|
|
// abi_version
|
|
Elements.addInt(LongTy, ClassABIVersion);
|
|
// ivar_offsets
|
|
Elements.add(IvarOffsets);
|
|
// properties
|
|
Elements.add(Properties);
|
|
// strong_pointers
|
|
Elements.add(StrongIvarBitmap);
|
|
// weak_pointers
|
|
Elements.add(WeakIvarBitmap);
|
|
// Create an instance of the structure
|
|
// This is now an externally visible symbol, so that we can speed up class
|
|
// messages in the next ABI. We may already have some weak references to
|
|
// this, so check and fix them properly.
|
|
std::string ClassSym((isMeta ? "_OBJC_METACLASS_": "_OBJC_CLASS_") +
|
|
std::string(Name));
|
|
llvm::GlobalVariable *ClassRef = TheModule.getNamedGlobal(ClassSym);
|
|
llvm::Constant *Class =
|
|
Elements.finishAndCreateGlobal(ClassSym, CGM.getPointerAlign(), false,
|
|
llvm::GlobalValue::ExternalLinkage);
|
|
if (ClassRef) {
|
|
ClassRef->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(Class,
|
|
ClassRef->getType()));
|
|
ClassRef->removeFromParent();
|
|
Class->setName(ClassSym);
|
|
}
|
|
return Class;
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::
|
|
GenerateProtocolMethodList(ArrayRef<const ObjCMethodDecl*> Methods) {
|
|
// Get the method structure type.
|
|
llvm::StructType *ObjCMethodDescTy =
|
|
llvm::StructType::get(CGM.getLLVMContext(), { PtrToInt8Ty, PtrToInt8Ty });
|
|
ASTContext &Context = CGM.getContext();
|
|
ConstantInitBuilder Builder(CGM);
|
|
auto MethodList = Builder.beginStruct();
|
|
MethodList.addInt(IntTy, Methods.size());
|
|
auto MethodArray = MethodList.beginArray(ObjCMethodDescTy);
|
|
for (auto *M : Methods) {
|
|
auto Method = MethodArray.beginStruct(ObjCMethodDescTy);
|
|
Method.add(MakeConstantString(M->getSelector().getAsString()));
|
|
Method.add(MakeConstantString(Context.getObjCEncodingForMethodDecl(M)));
|
|
Method.finishAndAddTo(MethodArray);
|
|
}
|
|
MethodArray.finishAndAddTo(MethodList);
|
|
return MethodList.finishAndCreateGlobal(".objc_method_list",
|
|
CGM.getPointerAlign());
|
|
}
|
|
|
|
// Create the protocol list structure used in classes, categories and so on
|
|
llvm::Constant *
|
|
CGObjCGNU::GenerateProtocolList(ArrayRef<std::string> Protocols) {
|
|
|
|
ConstantInitBuilder Builder(CGM);
|
|
auto ProtocolList = Builder.beginStruct();
|
|
ProtocolList.add(NULLPtr);
|
|
ProtocolList.addInt(LongTy, Protocols.size());
|
|
|
|
auto Elements = ProtocolList.beginArray(PtrToInt8Ty);
|
|
for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end();
|
|
iter != endIter ; iter++) {
|
|
llvm::Constant *protocol = nullptr;
|
|
llvm::StringMap<llvm::Constant*>::iterator value =
|
|
ExistingProtocols.find(*iter);
|
|
if (value == ExistingProtocols.end()) {
|
|
protocol = GenerateEmptyProtocol(*iter);
|
|
} else {
|
|
protocol = value->getValue();
|
|
}
|
|
Elements.addBitCast(protocol, PtrToInt8Ty);
|
|
}
|
|
Elements.finishAndAddTo(ProtocolList);
|
|
return ProtocolList.finishAndCreateGlobal(".objc_protocol_list",
|
|
CGM.getPointerAlign());
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::GenerateProtocolRef(CodeGenFunction &CGF,
|
|
const ObjCProtocolDecl *PD) {
|
|
auto protocol = GenerateProtocolRef(PD);
|
|
llvm::Type *T =
|
|
CGM.getTypes().ConvertType(CGM.getContext().getObjCProtoType());
|
|
return CGF.Builder.CreateBitCast(protocol, llvm::PointerType::getUnqual(T));
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GenerateProtocolRef(const ObjCProtocolDecl *PD) {
|
|
llvm::Constant *&protocol = ExistingProtocols[PD->getNameAsString()];
|
|
if (!protocol)
|
|
GenerateProtocol(PD);
|
|
assert(protocol && "Unknown protocol");
|
|
return protocol;
|
|
}
|
|
|
|
llvm::Constant *
|
|
CGObjCGNU::GenerateEmptyProtocol(StringRef ProtocolName) {
|
|
llvm::Constant *ProtocolList = GenerateProtocolList({});
|
|
llvm::Constant *MethodList = GenerateProtocolMethodList({});
|
|
MethodList = llvm::ConstantExpr::getBitCast(MethodList, PtrToInt8Ty);
|
|
// Protocols are objects containing lists of the methods implemented and
|
|
// protocols adopted.
|
|
ConstantInitBuilder Builder(CGM);
|
|
auto Elements = Builder.beginStruct();
|
|
|
|
// The isa pointer must be set to a magic number so the runtime knows it's
|
|
// the correct layout.
|
|
Elements.add(llvm::ConstantExpr::getIntToPtr(
|
|
llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy));
|
|
|
|
Elements.add(MakeConstantString(ProtocolName, ".objc_protocol_name"));
|
|
Elements.add(ProtocolList); /* .protocol_list */
|
|
Elements.add(MethodList); /* .instance_methods */
|
|
Elements.add(MethodList); /* .class_methods */
|
|
Elements.add(MethodList); /* .optional_instance_methods */
|
|
Elements.add(MethodList); /* .optional_class_methods */
|
|
Elements.add(NULLPtr); /* .properties */
|
|
Elements.add(NULLPtr); /* .optional_properties */
|
|
return Elements.finishAndCreateGlobal(SymbolForProtocol(ProtocolName),
|
|
CGM.getPointerAlign());
|
|
}
|
|
|
|
void CGObjCGNU::GenerateProtocol(const ObjCProtocolDecl *PD) {
|
|
if (PD->isNonRuntimeProtocol())
|
|
return;
|
|
|
|
std::string ProtocolName = PD->getNameAsString();
|
|
|
|
// Use the protocol definition, if there is one.
|
|
if (const ObjCProtocolDecl *Def = PD->getDefinition())
|
|
PD = Def;
|
|
|
|
SmallVector<std::string, 16> Protocols;
|
|
for (const auto *PI : PD->protocols())
|
|
Protocols.push_back(PI->getNameAsString());
|
|
SmallVector<const ObjCMethodDecl*, 16> InstanceMethods;
|
|
SmallVector<const ObjCMethodDecl*, 16> OptionalInstanceMethods;
|
|
for (const auto *I : PD->instance_methods())
|
|
if (I->isOptional())
|
|
OptionalInstanceMethods.push_back(I);
|
|
else
|
|
InstanceMethods.push_back(I);
|
|
// Collect information about class methods:
|
|
SmallVector<const ObjCMethodDecl*, 16> ClassMethods;
|
|
SmallVector<const ObjCMethodDecl*, 16> OptionalClassMethods;
|
|
for (const auto *I : PD->class_methods())
|
|
if (I->isOptional())
|
|
OptionalClassMethods.push_back(I);
|
|
else
|
|
ClassMethods.push_back(I);
|
|
|
|
llvm::Constant *ProtocolList = GenerateProtocolList(Protocols);
|
|
llvm::Constant *InstanceMethodList =
|
|
GenerateProtocolMethodList(InstanceMethods);
|
|
llvm::Constant *ClassMethodList =
|
|
GenerateProtocolMethodList(ClassMethods);
|
|
llvm::Constant *OptionalInstanceMethodList =
|
|
GenerateProtocolMethodList(OptionalInstanceMethods);
|
|
llvm::Constant *OptionalClassMethodList =
|
|
GenerateProtocolMethodList(OptionalClassMethods);
|
|
|
|
// Property metadata: name, attributes, isSynthesized, setter name, setter
|
|
// types, getter name, getter types.
|
|
// The isSynthesized value is always set to 0 in a protocol. It exists to
|
|
// simplify the runtime library by allowing it to use the same data
|
|
// structures for protocol metadata everywhere.
|
|
|
|
llvm::Constant *PropertyList =
|
|
GeneratePropertyList(nullptr, PD, false, false);
|
|
llvm::Constant *OptionalPropertyList =
|
|
GeneratePropertyList(nullptr, PD, false, true);
|
|
|
|
// Protocols are objects containing lists of the methods implemented and
|
|
// protocols adopted.
|
|
// The isa pointer must be set to a magic number so the runtime knows it's
|
|
// the correct layout.
|
|
ConstantInitBuilder Builder(CGM);
|
|
auto Elements = Builder.beginStruct();
|
|
Elements.add(
|
|
llvm::ConstantExpr::getIntToPtr(
|
|
llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy));
|
|
Elements.add(MakeConstantString(ProtocolName));
|
|
Elements.add(ProtocolList);
|
|
Elements.add(InstanceMethodList);
|
|
Elements.add(ClassMethodList);
|
|
Elements.add(OptionalInstanceMethodList);
|
|
Elements.add(OptionalClassMethodList);
|
|
Elements.add(PropertyList);
|
|
Elements.add(OptionalPropertyList);
|
|
ExistingProtocols[ProtocolName] =
|
|
llvm::ConstantExpr::getBitCast(
|
|
Elements.finishAndCreateGlobal(".objc_protocol", CGM.getPointerAlign()),
|
|
IdTy);
|
|
}
|
|
void CGObjCGNU::GenerateProtocolHolderCategory() {
|
|
// Collect information about instance methods
|
|
|
|
ConstantInitBuilder Builder(CGM);
|
|
auto Elements = Builder.beginStruct();
|
|
|
|
const std::string ClassName = "__ObjC_Protocol_Holder_Ugly_Hack";
|
|
const std::string CategoryName = "AnotherHack";
|
|
Elements.add(MakeConstantString(CategoryName));
|
|
Elements.add(MakeConstantString(ClassName));
|
|
// Instance method list
|
|
Elements.addBitCast(GenerateMethodList(
|
|
ClassName, CategoryName, {}, false), PtrTy);
|
|
// Class method list
|
|
Elements.addBitCast(GenerateMethodList(
|
|
ClassName, CategoryName, {}, true), PtrTy);
|
|
|
|
// Protocol list
|
|
ConstantInitBuilder ProtocolListBuilder(CGM);
|
|
auto ProtocolList = ProtocolListBuilder.beginStruct();
|
|
ProtocolList.add(NULLPtr);
|
|
ProtocolList.addInt(LongTy, ExistingProtocols.size());
|
|
auto ProtocolElements = ProtocolList.beginArray(PtrTy);
|
|
for (auto iter = ExistingProtocols.begin(), endIter = ExistingProtocols.end();
|
|
iter != endIter ; iter++) {
|
|
ProtocolElements.addBitCast(iter->getValue(), PtrTy);
|
|
}
|
|
ProtocolElements.finishAndAddTo(ProtocolList);
|
|
Elements.addBitCast(
|
|
ProtocolList.finishAndCreateGlobal(".objc_protocol_list",
|
|
CGM.getPointerAlign()),
|
|
PtrTy);
|
|
Categories.push_back(llvm::ConstantExpr::getBitCast(
|
|
Elements.finishAndCreateGlobal("", CGM.getPointerAlign()),
|
|
PtrTy));
|
|
}
|
|
|
|
/// Libobjc2 uses a bitfield representation where small(ish) bitfields are
|
|
/// stored in a 64-bit value with the low bit set to 1 and the remaining 63
|
|
/// bits set to their values, LSB first, while larger ones are stored in a
|
|
/// structure of this / form:
|
|
///
|
|
/// struct { int32_t length; int32_t values[length]; };
|
|
///
|
|
/// The values in the array are stored in host-endian format, with the least
|
|
/// significant bit being assumed to come first in the bitfield. Therefore, a
|
|
/// bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] }, while a
|
|
/// bitfield / with the 63rd bit set will be 1<<64.
|
|
llvm::Constant *CGObjCGNU::MakeBitField(ArrayRef<bool> bits) {
|
|
int bitCount = bits.size();
|
|
int ptrBits = CGM.getDataLayout().getPointerSizeInBits();
|
|
if (bitCount < ptrBits) {
|
|
uint64_t val = 1;
|
|
for (int i=0 ; i<bitCount ; ++i) {
|
|
if (bits[i]) val |= 1ULL<<(i+1);
|
|
}
|
|
return llvm::ConstantInt::get(IntPtrTy, val);
|
|
}
|
|
SmallVector<llvm::Constant *, 8> values;
|
|
int v=0;
|
|
while (v < bitCount) {
|
|
int32_t word = 0;
|
|
for (int i=0 ; (i<32) && (v<bitCount) ; ++i) {
|
|
if (bits[v]) word |= 1<<i;
|
|
v++;
|
|
}
|
|
values.push_back(llvm::ConstantInt::get(Int32Ty, word));
|
|
}
|
|
|
|
ConstantInitBuilder builder(CGM);
|
|
auto fields = builder.beginStruct();
|
|
fields.addInt(Int32Ty, values.size());
|
|
auto array = fields.beginArray();
|
|
for (auto v : values) array.add(v);
|
|
array.finishAndAddTo(fields);
|
|
|
|
llvm::Constant *GS =
|
|
fields.finishAndCreateGlobal("", CharUnits::fromQuantity(4));
|
|
llvm::Constant *ptr = llvm::ConstantExpr::getPtrToInt(GS, IntPtrTy);
|
|
return ptr;
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GenerateCategoryProtocolList(const
|
|
ObjCCategoryDecl *OCD) {
|
|
const auto &RefPro = OCD->getReferencedProtocols();
|
|
const auto RuntimeProtos =
|
|
GetRuntimeProtocolList(RefPro.begin(), RefPro.end());
|
|
SmallVector<std::string, 16> Protocols;
|
|
for (const auto *PD : RuntimeProtos)
|
|
Protocols.push_back(PD->getNameAsString());
|
|
return GenerateProtocolList(Protocols);
|
|
}
|
|
|
|
void CGObjCGNU::GenerateCategory(const ObjCCategoryImplDecl *OCD) {
|
|
const ObjCInterfaceDecl *Class = OCD->getClassInterface();
|
|
std::string ClassName = Class->getNameAsString();
|
|
std::string CategoryName = OCD->getNameAsString();
|
|
|
|
// Collect the names of referenced protocols
|
|
const ObjCCategoryDecl *CatDecl = OCD->getCategoryDecl();
|
|
|
|
ConstantInitBuilder Builder(CGM);
|
|
auto Elements = Builder.beginStruct();
|
|
Elements.add(MakeConstantString(CategoryName));
|
|
Elements.add(MakeConstantString(ClassName));
|
|
// Instance method list
|
|
SmallVector<ObjCMethodDecl*, 16> InstanceMethods;
|
|
InstanceMethods.insert(InstanceMethods.begin(), OCD->instmeth_begin(),
|
|
OCD->instmeth_end());
|
|
Elements.addBitCast(
|
|
GenerateMethodList(ClassName, CategoryName, InstanceMethods, false),
|
|
PtrTy);
|
|
// Class method list
|
|
|
|
SmallVector<ObjCMethodDecl*, 16> ClassMethods;
|
|
ClassMethods.insert(ClassMethods.begin(), OCD->classmeth_begin(),
|
|
OCD->classmeth_end());
|
|
Elements.addBitCast(
|
|
GenerateMethodList(ClassName, CategoryName, ClassMethods, true),
|
|
PtrTy);
|
|
// Protocol list
|
|
Elements.addBitCast(GenerateCategoryProtocolList(CatDecl), PtrTy);
|
|
if (isRuntime(ObjCRuntime::GNUstep, 2)) {
|
|
const ObjCCategoryDecl *Category =
|
|
Class->FindCategoryDeclaration(OCD->getIdentifier());
|
|
if (Category) {
|
|
// Instance properties
|
|
Elements.addBitCast(GeneratePropertyList(OCD, Category, false), PtrTy);
|
|
// Class properties
|
|
Elements.addBitCast(GeneratePropertyList(OCD, Category, true), PtrTy);
|
|
} else {
|
|
Elements.addNullPointer(PtrTy);
|
|
Elements.addNullPointer(PtrTy);
|
|
}
|
|
}
|
|
|
|
Categories.push_back(llvm::ConstantExpr::getBitCast(
|
|
Elements.finishAndCreateGlobal(
|
|
std::string(".objc_category_")+ClassName+CategoryName,
|
|
CGM.getPointerAlign()),
|
|
PtrTy));
|
|
}
|
|
|
|
llvm::Constant *CGObjCGNU::GeneratePropertyList(const Decl *Container,
|
|
const ObjCContainerDecl *OCD,
|
|
bool isClassProperty,
|
|
bool protocolOptionalProperties) {
|
|
|
|
SmallVector<const ObjCPropertyDecl *, 16> Properties;
|
|
llvm::SmallPtrSet<const IdentifierInfo*, 16> PropertySet;
|
|
bool isProtocol = isa<ObjCProtocolDecl>(OCD);
|
|
ASTContext &Context = CGM.getContext();
|
|
|
|
std::function<void(const ObjCProtocolDecl *Proto)> collectProtocolProperties
|
|
= [&](const ObjCProtocolDecl *Proto) {
|
|
for (const auto *P : Proto->protocols())
|
|
collectProtocolProperties(P);
|
|
for (const auto *PD : Proto->properties()) {
|
|
if (isClassProperty != PD->isClassProperty())
|
|
continue;
|
|
// Skip any properties that are declared in protocols that this class
|
|
// conforms to but are not actually implemented by this class.
|
|
if (!isProtocol && !Context.getObjCPropertyImplDeclForPropertyDecl(PD, Container))
|
|
continue;
|
|
if (!PropertySet.insert(PD->getIdentifier()).second)
|
|
continue;
|
|
Properties.push_back(PD);
|
|
}
|
|
};
|
|
|
|
if (const ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(OCD))
|
|
for (const ObjCCategoryDecl *ClassExt : OID->known_extensions())
|
|
for (auto *PD : ClassExt->properties()) {
|
|
if (isClassProperty != PD->isClassProperty())
|
|
continue;
|
|
PropertySet.insert(PD->getIdentifier());
|
|
Properties.push_back(PD);
|
|
}
|
|
|
|
for (const auto *PD : OCD->properties()) {
|
|
if (isClassProperty != PD->isClassProperty())
|
|
continue;
|
|
// If we're generating a list for a protocol, skip optional / required ones
|
|
// when generating the other list.
|
|
if (isProtocol && (protocolOptionalProperties != PD->isOptional()))
|
|
continue;
|
|
// Don't emit duplicate metadata for properties that were already in a
|
|
// class extension.
|
|
if (!PropertySet.insert(PD->getIdentifier()).second)
|
|
continue;
|
|
|
|
Properties.push_back(PD);
|
|
}
|
|
|
|
if (const ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(OCD))
|
|
for (const auto *P : OID->all_referenced_protocols())
|
|
collectProtocolProperties(P);
|
|
else if (const ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(OCD))
|
|
for (const auto *P : CD->protocols())
|
|
collectProtocolProperties(P);
|
|
|
|
auto numProperties = Properties.size();
|
|
|
|
if (numProperties == 0)
|
|
return NULLPtr;
|
|
|
|
ConstantInitBuilder builder(CGM);
|
|
auto propertyList = builder.beginStruct();
|
|
auto properties = PushPropertyListHeader(propertyList, numProperties);
|
|
|
|
// Add all of the property methods need adding to the method list and to the
|
|
// property metadata list.
|
|
for (auto *property : Properties) {
|
|
bool isSynthesized = false;
|
|
bool isDynamic = false;
|
|
if (!isProtocol) {
|
|
auto *propertyImpl = Context.getObjCPropertyImplDeclForPropertyDecl(property, Container);
|
|
if (propertyImpl) {
|
|
isSynthesized = (propertyImpl->getPropertyImplementation() ==
|
|
ObjCPropertyImplDecl::Synthesize);
|
|
isDynamic = (propertyImpl->getPropertyImplementation() ==
|
|
ObjCPropertyImplDecl::Dynamic);
|
|
}
|
|
}
|
|
PushProperty(properties, property, Container, isSynthesized, isDynamic);
|
|
}
|
|
properties.finishAndAddTo(propertyList);
|
|
|
|
return propertyList.finishAndCreateGlobal(".objc_property_list",
|
|
CGM.getPointerAlign());
|
|
}
|
|
|
|
void CGObjCGNU::RegisterAlias(const ObjCCompatibleAliasDecl *OAD) {
|
|
// Get the class declaration for which the alias is specified.
|
|
ObjCInterfaceDecl *ClassDecl =
|
|
const_cast<ObjCInterfaceDecl *>(OAD->getClassInterface());
|
|
ClassAliases.emplace_back(ClassDecl->getNameAsString(),
|
|
OAD->getNameAsString());
|
|
}
|
|
|
|
void CGObjCGNU::GenerateClass(const ObjCImplementationDecl *OID) {
|
|
ASTContext &Context = CGM.getContext();
|
|
|
|
// Get the superclass name.
|
|
const ObjCInterfaceDecl * SuperClassDecl =
|
|
OID->getClassInterface()->getSuperClass();
|
|
std::string SuperClassName;
|
|
if (SuperClassDecl) {
|
|
SuperClassName = SuperClassDecl->getNameAsString();
|
|
EmitClassRef(SuperClassName);
|
|
}
|
|
|
|
// Get the class name
|
|
ObjCInterfaceDecl *ClassDecl =
|
|
const_cast<ObjCInterfaceDecl *>(OID->getClassInterface());
|
|
std::string ClassName = ClassDecl->getNameAsString();
|
|
|
|
// Emit the symbol that is used to generate linker errors if this class is
|
|
// referenced in other modules but not declared.
|
|
std::string classSymbolName = "__objc_class_name_" + ClassName;
|
|
if (auto *symbol = TheModule.getGlobalVariable(classSymbolName)) {
|
|
symbol->setInitializer(llvm::ConstantInt::get(LongTy, 0));
|
|
} else {
|
|
new llvm::GlobalVariable(TheModule, LongTy, false,
|
|
llvm::GlobalValue::ExternalLinkage,
|
|
llvm::ConstantInt::get(LongTy, 0),
|
|
classSymbolName);
|
|
}
|
|
|
|
// Get the size of instances.
|
|
int instanceSize =
|
|
Context.getASTObjCImplementationLayout(OID).getSize().getQuantity();
|
|
|
|
// Collect information about instance variables.
|
|
SmallVector<llvm::Constant*, 16> IvarNames;
|
|
SmallVector<llvm::Constant*, 16> IvarTypes;
|
|
SmallVector<llvm::Constant*, 16> IvarOffsets;
|
|
SmallVector<llvm::Constant*, 16> IvarAligns;
|
|
SmallVector<Qualifiers::ObjCLifetime, 16> IvarOwnership;
|
|
|
|
ConstantInitBuilder IvarOffsetBuilder(CGM);
|
|
auto IvarOffsetValues = IvarOffsetBuilder.beginArray(PtrToIntTy);
|
|
SmallVector<bool, 16> WeakIvars;
|
|
SmallVector<bool, 16> StrongIvars;
|
|
|
|
int superInstanceSize = !SuperClassDecl ? 0 :
|
|
Context.getASTObjCInterfaceLayout(SuperClassDecl).getSize().getQuantity();
|
|
// For non-fragile ivars, set the instance size to 0 - {the size of just this
|
|
// class}. The runtime will then set this to the correct value on load.
|
|
if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
|
|
instanceSize = 0 - (instanceSize - superInstanceSize);
|
|
}
|
|
|
|
for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD;
|
|
IVD = IVD->getNextIvar()) {
|
|
// Store the name
|
|
IvarNames.push_back(MakeConstantString(IVD->getNameAsString()));
|
|
// Get the type encoding for this ivar
|
|
std::string TypeStr;
|
|
Context.getObjCEncodingForType(IVD->getType(), TypeStr, IVD);
|
|
IvarTypes.push_back(MakeConstantString(TypeStr));
|
|
IvarAligns.push_back(llvm::ConstantInt::get(IntTy,
|
|
Context.getTypeSize(IVD->getType())));
|
|
// Get the offset
|
|
uint64_t BaseOffset = ComputeIvarBaseOffset(CGM, OID, IVD);
|
|
uint64_t Offset = BaseOffset;
|
|
if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
|
|
Offset = BaseOffset - superInstanceSize;
|
|
}
|
|
llvm::Constant *OffsetValue = llvm::ConstantInt::get(IntTy, Offset);
|
|
// Create the direct offset value
|
|
std::string OffsetName = "__objc_ivar_offset_value_" + ClassName +"." +
|
|
IVD->getNameAsString();
|
|
|
|
llvm::GlobalVariable *OffsetVar = TheModule.getGlobalVariable(OffsetName);
|
|
if (OffsetVar) {
|
|
OffsetVar->setInitializer(OffsetValue);
|
|
// If this is the real definition, change its linkage type so that
|
|
// different modules will use this one, rather than their private
|
|
// copy.
|
|
OffsetVar->setLinkage(llvm::GlobalValue::ExternalLinkage);
|
|
} else
|
|
OffsetVar = new llvm::GlobalVariable(TheModule, Int32Ty,
|
|
false, llvm::GlobalValue::ExternalLinkage,
|
|
OffsetValue, OffsetName);
|
|
IvarOffsets.push_back(OffsetValue);
|
|
IvarOffsetValues.add(OffsetVar);
|
|
Qualifiers::ObjCLifetime lt = IVD->getType().getQualifiers().getObjCLifetime();
|
|
IvarOwnership.push_back(lt);
|
|
switch (lt) {
|
|
case Qualifiers::OCL_Strong:
|
|
StrongIvars.push_back(true);
|
|
WeakIvars.push_back(false);
|
|
break;
|
|
case Qualifiers::OCL_Weak:
|
|
StrongIvars.push_back(false);
|
|
WeakIvars.push_back(true);
|
|
break;
|
|
default:
|
|
StrongIvars.push_back(false);
|
|
WeakIvars.push_back(false);
|
|
}
|
|
}
|
|
llvm::Constant *StrongIvarBitmap = MakeBitField(StrongIvars);
|
|
llvm::Constant *WeakIvarBitmap = MakeBitField(WeakIvars);
|
|
llvm::GlobalVariable *IvarOffsetArray =
|
|
IvarOffsetValues.finishAndCreateGlobal(".ivar.offsets",
|
|
CGM.getPointerAlign());
|
|
|
|
// Collect information about instance methods
|
|
SmallVector<const ObjCMethodDecl*, 16> InstanceMethods;
|
|
InstanceMethods.insert(InstanceMethods.begin(), OID->instmeth_begin(),
|
|
OID->instmeth_end());
|
|
|
|
SmallVector<const ObjCMethodDecl*, 16> ClassMethods;
|
|
ClassMethods.insert(ClassMethods.begin(), OID->classmeth_begin(),
|
|
OID->classmeth_end());
|
|
|
|
llvm::Constant *Properties = GeneratePropertyList(OID, ClassDecl);
|
|
|
|
// Collect the names of referenced protocols
|
|
auto RefProtocols = ClassDecl->protocols();
|
|
auto RuntimeProtocols =
|
|
GetRuntimeProtocolList(RefProtocols.begin(), RefProtocols.end());
|
|
SmallVector<std::string, 16> Protocols;
|
|
for (const auto *I : RuntimeProtocols)
|
|
Protocols.push_back(I->getNameAsString());
|
|
|
|
// Get the superclass pointer.
|
|
llvm::Constant *SuperClass;
|
|
if (!SuperClassName.empty()) {
|
|
SuperClass = MakeConstantString(SuperClassName, ".super_class_name");
|
|
} else {
|
|
SuperClass = llvm::ConstantPointerNull::get(PtrToInt8Ty);
|
|
}
|
|
// Empty vector used to construct empty method lists
|
|
SmallVector<llvm::Constant*, 1> empty;
|
|
// Generate the method and instance variable lists
|
|
llvm::Constant *MethodList = GenerateMethodList(ClassName, "",
|
|
InstanceMethods, false);
|
|
llvm::Constant *ClassMethodList = GenerateMethodList(ClassName, "",
|
|
ClassMethods, true);
|
|
llvm::Constant *IvarList = GenerateIvarList(IvarNames, IvarTypes,
|
|
IvarOffsets, IvarAligns, IvarOwnership);
|
|
// Irrespective of whether we are compiling for a fragile or non-fragile ABI,
|
|
// we emit a symbol containing the offset for each ivar in the class. This
|
|
// allows code compiled for the non-Fragile ABI to inherit from code compiled
|
|
// for the legacy ABI, without causing problems. The converse is also
|
|
// possible, but causes all ivar accesses to be fragile.
|
|
|
|
// Offset pointer for getting at the correct field in the ivar list when
|
|
// setting up the alias. These are: The base address for the global, the
|
|
// ivar array (second field), the ivar in this list (set for each ivar), and
|
|
// the offset (third field in ivar structure)
|
|
llvm::Type *IndexTy = Int32Ty;
|
|
llvm::Constant *offsetPointerIndexes[] = {Zeros[0],
|
|
llvm::ConstantInt::get(IndexTy, ClassABIVersion > 1 ? 2 : 1), nullptr,
|
|
llvm::ConstantInt::get(IndexTy, ClassABIVersion > 1 ? 3 : 2) };
|
|
|
|
unsigned ivarIndex = 0;
|
|
for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD;
|
|
IVD = IVD->getNextIvar()) {
|
|
const std::string Name = GetIVarOffsetVariableName(ClassDecl, IVD);
|
|
offsetPointerIndexes[2] = llvm::ConstantInt::get(IndexTy, ivarIndex);
|
|
// Get the correct ivar field
|
|
llvm::Constant *offsetValue = llvm::ConstantExpr::getGetElementPtr(
|
|
cast<llvm::GlobalVariable>(IvarList)->getValueType(), IvarList,
|
|
offsetPointerIndexes);
|
|
// Get the existing variable, if one exists.
|
|
llvm::GlobalVariable *offset = TheModule.getNamedGlobal(Name);
|
|
if (offset) {
|
|
offset->setInitializer(offsetValue);
|
|
// If this is the real definition, change its linkage type so that
|
|
// different modules will use this one, rather than their private
|
|
// copy.
|
|
offset->setLinkage(llvm::GlobalValue::ExternalLinkage);
|
|
} else
|
|
// Add a new alias if there isn't one already.
|
|
new llvm::GlobalVariable(TheModule, offsetValue->getType(),
|
|
false, llvm::GlobalValue::ExternalLinkage, offsetValue, Name);
|
|
++ivarIndex;
|
|
}
|
|
llvm::Constant *ZeroPtr = llvm::ConstantInt::get(IntPtrTy, 0);
|
|
|
|
//Generate metaclass for class methods
|
|
llvm::Constant *MetaClassStruct = GenerateClassStructure(
|
|
NULLPtr, NULLPtr, 0x12L, ClassName.c_str(), nullptr, Zeros[0],
|
|
NULLPtr, ClassMethodList, NULLPtr, NULLPtr,
|
|
GeneratePropertyList(OID, ClassDecl, true), ZeroPtr, ZeroPtr, true);
|
|
CGM.setGVProperties(cast<llvm::GlobalValue>(MetaClassStruct),
|
|
OID->getClassInterface());
|
|
|
|
// Generate the class structure
|
|
llvm::Constant *ClassStruct = GenerateClassStructure(
|
|
MetaClassStruct, SuperClass, 0x11L, ClassName.c_str(), nullptr,
|
|
llvm::ConstantInt::get(LongTy, instanceSize), IvarList, MethodList,
|
|
GenerateProtocolList(Protocols), IvarOffsetArray, Properties,
|
|
StrongIvarBitmap, WeakIvarBitmap);
|
|
CGM.setGVProperties(cast<llvm::GlobalValue>(ClassStruct),
|
|
OID->getClassInterface());
|
|
|
|
// Resolve the class aliases, if they exist.
|
|
if (ClassPtrAlias) {
|
|
ClassPtrAlias->replaceAllUsesWith(
|
|
llvm::ConstantExpr::getBitCast(ClassStruct, IdTy));
|
|
ClassPtrAlias->eraseFromParent();
|
|
ClassPtrAlias = nullptr;
|
|
}
|
|
if (MetaClassPtrAlias) {
|
|
MetaClassPtrAlias->replaceAllUsesWith(
|
|
llvm::ConstantExpr::getBitCast(MetaClassStruct, IdTy));
|
|
MetaClassPtrAlias->eraseFromParent();
|
|
MetaClassPtrAlias = nullptr;
|
|
}
|
|
|
|
// Add class structure to list to be added to the symtab later
|
|
ClassStruct = llvm::ConstantExpr::getBitCast(ClassStruct, PtrToInt8Ty);
|
|
Classes.push_back(ClassStruct);
|
|
}
|
|
|
|
llvm::Function *CGObjCGNU::ModuleInitFunction() {
|
|
// Only emit an ObjC load function if no Objective-C stuff has been called
|
|
if (Classes.empty() && Categories.empty() && ConstantStrings.empty() &&
|
|
ExistingProtocols.empty() && SelectorTable.empty())
|
|
return nullptr;
|
|
|
|
// Add all referenced protocols to a category.
|
|
GenerateProtocolHolderCategory();
|
|
|
|
llvm::StructType *selStructTy =
|
|
dyn_cast<llvm::StructType>(SelectorTy->getPointerElementType());
|
|
llvm::Type *selStructPtrTy = SelectorTy;
|
|
if (!selStructTy) {
|
|
selStructTy = llvm::StructType::get(CGM.getLLVMContext(),
|
|
{ PtrToInt8Ty, PtrToInt8Ty });
|
|
selStructPtrTy = llvm::PointerType::getUnqual(selStructTy);
|
|
}
|
|
|
|
// Generate statics list:
|
|
llvm::Constant *statics = NULLPtr;
|
|
if (!ConstantStrings.empty()) {
|
|
llvm::GlobalVariable *fileStatics = [&] {
|
|
ConstantInitBuilder builder(CGM);
|
|
auto staticsStruct = builder.beginStruct();
|
|
|
|
StringRef stringClass = CGM.getLangOpts().ObjCConstantStringClass;
|
|
if (stringClass.empty()) stringClass = "NXConstantString";
|
|
staticsStruct.add(MakeConstantString(stringClass,
|
|
".objc_static_class_name"));
|
|
|
|
auto array = staticsStruct.beginArray();
|
|
array.addAll(ConstantStrings);
|
|
array.add(NULLPtr);
|
|
array.finishAndAddTo(staticsStruct);
|
|
|
|
return staticsStruct.finishAndCreateGlobal(".objc_statics",
|
|
CGM.getPointerAlign());
|
|
}();
|
|
|
|
ConstantInitBuilder builder(CGM);
|
|
auto allStaticsArray = builder.beginArray(fileStatics->getType());
|
|
allStaticsArray.add(fileStatics);
|
|
allStaticsArray.addNullPointer(fileStatics->getType());
|
|
|
|
statics = allStaticsArray.finishAndCreateGlobal(".objc_statics_ptr",
|
|
CGM.getPointerAlign());
|
|
statics = llvm::ConstantExpr::getBitCast(statics, PtrTy);
|
|
}
|
|
|
|
// Array of classes, categories, and constant objects.
|
|
|
|
SmallVector<llvm::GlobalAlias*, 16> selectorAliases;
|
|
unsigned selectorCount;
|
|
|
|
// Pointer to an array of selectors used in this module.
|
|
llvm::GlobalVariable *selectorList = [&] {
|
|
ConstantInitBuilder builder(CGM);
|
|
auto selectors = builder.beginArray(selStructTy);
|
|
auto &table = SelectorTable; // MSVC workaround
|
|
std::vector<Selector> allSelectors;
|
|
for (auto &entry : table)
|
|
allSelectors.push_back(entry.first);
|
|
llvm::sort(allSelectors);
|
|
|
|
for (auto &untypedSel : allSelectors) {
|
|
std::string selNameStr = untypedSel.getAsString();
|
|
llvm::Constant *selName = ExportUniqueString(selNameStr, ".objc_sel_name");
|
|
|
|
for (TypedSelector &sel : table[untypedSel]) {
|
|
llvm::Constant *selectorTypeEncoding = NULLPtr;
|
|
if (!sel.first.empty())
|
|
selectorTypeEncoding =
|
|
MakeConstantString(sel.first, ".objc_sel_types");
|
|
|
|
auto selStruct = selectors.beginStruct(selStructTy);
|
|
selStruct.add(selName);
|
|
selStruct.add(selectorTypeEncoding);
|
|
selStruct.finishAndAddTo(selectors);
|
|
|
|
// Store the selector alias for later replacement
|
|
selectorAliases.push_back(sel.second);
|
|
}
|
|
}
|
|
|
|
// Remember the number of entries in the selector table.
|
|
selectorCount = selectors.size();
|
|
|
|
// NULL-terminate the selector list. This should not actually be required,
|
|
// because the selector list has a length field. Unfortunately, the GCC
|
|
// runtime decides to ignore the length field and expects a NULL terminator,
|
|
// and GCC cooperates with this by always setting the length to 0.
|
|
auto selStruct = selectors.beginStruct(selStructTy);
|
|
selStruct.add(NULLPtr);
|
|
selStruct.add(NULLPtr);
|
|
selStruct.finishAndAddTo(selectors);
|
|
|
|
return selectors.finishAndCreateGlobal(".objc_selector_list",
|
|
CGM.getPointerAlign());
|
|
}();
|
|
|
|
// Now that all of the static selectors exist, create pointers to them.
|
|
for (unsigned i = 0; i < selectorCount; ++i) {
|
|
llvm::Constant *idxs[] = {
|
|
Zeros[0],
|
|
llvm::ConstantInt::get(Int32Ty, i)
|
|
};
|
|
// FIXME: We're generating redundant loads and stores here!
|
|
llvm::Constant *selPtr = llvm::ConstantExpr::getGetElementPtr(
|
|
selectorList->getValueType(), selectorList, idxs);
|
|
// If selectors are defined as an opaque type, cast the pointer to this
|
|
// type.
|
|
selPtr = llvm::ConstantExpr::getBitCast(selPtr, SelectorTy);
|
|
selectorAliases[i]->replaceAllUsesWith(selPtr);
|
|
selectorAliases[i]->eraseFromParent();
|
|
}
|
|
|
|
llvm::GlobalVariable *symtab = [&] {
|
|
ConstantInitBuilder builder(CGM);
|
|
auto symtab = builder.beginStruct();
|
|
|
|
// Number of static selectors
|
|
symtab.addInt(LongTy, selectorCount);
|
|
|
|
symtab.addBitCast(selectorList, selStructPtrTy);
|
|
|
|
// Number of classes defined.
|
|
symtab.addInt(CGM.Int16Ty, Classes.size());
|
|
// Number of categories defined
|
|
symtab.addInt(CGM.Int16Ty, Categories.size());
|
|
|
|
// Create an array of classes, then categories, then static object instances
|
|
auto classList = symtab.beginArray(PtrToInt8Ty);
|
|
classList.addAll(Classes);
|
|
classList.addAll(Categories);
|
|
// NULL-terminated list of static object instances (mainly constant strings)
|
|
classList.add(statics);
|
|
classList.add(NULLPtr);
|
|
classList.finishAndAddTo(symtab);
|
|
|
|
// Construct the symbol table.
|
|
return symtab.finishAndCreateGlobal("", CGM.getPointerAlign());
|
|
}();
|
|
|
|
// The symbol table is contained in a module which has some version-checking
|
|
// constants
|
|
llvm::Constant *module = [&] {
|
|
llvm::Type *moduleEltTys[] = {
|
|
LongTy, LongTy, PtrToInt8Ty, symtab->getType(), IntTy
|
|
};
|
|
llvm::StructType *moduleTy =
|
|
llvm::StructType::get(CGM.getLLVMContext(),
|
|
makeArrayRef(moduleEltTys).drop_back(unsigned(RuntimeVersion < 10)));
|
|
|
|
ConstantInitBuilder builder(CGM);
|
|
auto module = builder.beginStruct(moduleTy);
|
|
// Runtime version, used for ABI compatibility checking.
|
|
module.addInt(LongTy, RuntimeVersion);
|
|
// sizeof(ModuleTy)
|
|
module.addInt(LongTy, CGM.getDataLayout().getTypeStoreSize(moduleTy));
|
|
|
|
// The path to the source file where this module was declared
|
|
SourceManager &SM = CGM.getContext().getSourceManager();
|
|
const FileEntry *mainFile = SM.getFileEntryForID(SM.getMainFileID());
|
|
std::string path =
|
|
(Twine(mainFile->getDir()->getName()) + "/" + mainFile->getName()).str();
|
|
module.add(MakeConstantString(path, ".objc_source_file_name"));
|
|
module.add(symtab);
|
|
|
|
if (RuntimeVersion >= 10) {
|
|
switch (CGM.getLangOpts().getGC()) {
|
|
case LangOptions::GCOnly:
|
|
module.addInt(IntTy, 2);
|
|
break;
|
|
case LangOptions::NonGC:
|
|
if (CGM.getLangOpts().ObjCAutoRefCount)
|
|
module.addInt(IntTy, 1);
|
|
else
|
|
module.addInt(IntTy, 0);
|
|
break;
|
|
case LangOptions::HybridGC:
|
|
module.addInt(IntTy, 1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return module.finishAndCreateGlobal("", CGM.getPointerAlign());
|
|
}();
|
|
|
|
// Create the load function calling the runtime entry point with the module
|
|
// structure
|
|
llvm::Function * LoadFunction = llvm::Function::Create(
|
|
llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false),
|
|
llvm::GlobalValue::InternalLinkage, ".objc_load_function",
|
|
&TheModule);
|
|
llvm::BasicBlock *EntryBB =
|
|
llvm::BasicBlock::Create(VMContext, "entry", LoadFunction);
|
|
CGBuilderTy Builder(CGM, VMContext);
|
|
Builder.SetInsertPoint(EntryBB);
|
|
|
|
llvm::FunctionType *FT =
|
|
llvm::FunctionType::get(Builder.getVoidTy(), module->getType(), true);
|
|
llvm::FunctionCallee Register =
|
|
CGM.CreateRuntimeFunction(FT, "__objc_exec_class");
|
|
Builder.CreateCall(Register, module);
|
|
|
|
if (!ClassAliases.empty()) {
|
|
llvm::Type *ArgTypes[2] = {PtrTy, PtrToInt8Ty};
|
|
llvm::FunctionType *RegisterAliasTy =
|
|
llvm::FunctionType::get(Builder.getVoidTy(),
|
|
ArgTypes, false);
|
|
llvm::Function *RegisterAlias = llvm::Function::Create(
|
|
RegisterAliasTy,
|
|
llvm::GlobalValue::ExternalWeakLinkage, "class_registerAlias_np",
|
|
&TheModule);
|
|
llvm::BasicBlock *AliasBB =
|
|
llvm::BasicBlock::Create(VMContext, "alias", LoadFunction);
|
|
llvm::BasicBlock *NoAliasBB =
|
|
llvm::BasicBlock::Create(VMContext, "no_alias", LoadFunction);
|
|
|
|
// Branch based on whether the runtime provided class_registerAlias_np()
|
|
llvm::Value *HasRegisterAlias = Builder.CreateICmpNE(RegisterAlias,
|
|
llvm::Constant::getNullValue(RegisterAlias->getType()));
|
|
Builder.CreateCondBr(HasRegisterAlias, AliasBB, NoAliasBB);
|
|
|
|
// The true branch (has alias registration function):
|
|
Builder.SetInsertPoint(AliasBB);
|
|
// Emit alias registration calls:
|
|
for (std::vector<ClassAliasPair>::iterator iter = ClassAliases.begin();
|
|
iter != ClassAliases.end(); ++iter) {
|
|
llvm::Constant *TheClass =
|
|
TheModule.getGlobalVariable("_OBJC_CLASS_" + iter->first, true);
|
|
if (TheClass) {
|
|
TheClass = llvm::ConstantExpr::getBitCast(TheClass, PtrTy);
|
|
Builder.CreateCall(RegisterAlias,
|
|
{TheClass, MakeConstantString(iter->second)});
|
|
}
|
|
}
|
|
// Jump to end:
|
|
Builder.CreateBr(NoAliasBB);
|
|
|
|
// Missing alias registration function, just return from the function:
|
|
Builder.SetInsertPoint(NoAliasBB);
|
|
}
|
|
Builder.CreateRetVoid();
|
|
|
|
return LoadFunction;
|
|
}
|
|
|
|
llvm::Function *CGObjCGNU::GenerateMethod(const ObjCMethodDecl *OMD,
|
|
const ObjCContainerDecl *CD) {
|
|
CodeGenTypes &Types = CGM.getTypes();
|
|
llvm::FunctionType *MethodTy =
|
|
Types.GetFunctionType(Types.arrangeObjCMethodDeclaration(OMD));
|
|
std::string FunctionName = getSymbolNameForMethod(OMD);
|
|
|
|
llvm::Function *Method
|
|
= llvm::Function::Create(MethodTy,
|
|
llvm::GlobalValue::InternalLinkage,
|
|
FunctionName,
|
|
&TheModule);
|
|
return Method;
|
|
}
|
|
|
|
void CGObjCGNU::GenerateDirectMethodPrologue(CodeGenFunction &CGF,
|
|
llvm::Function *Fn,
|
|
const ObjCMethodDecl *OMD,
|
|
const ObjCContainerDecl *CD) {
|
|
// GNU runtime doesn't support direct calls at this time
|
|
}
|
|
|
|
llvm::FunctionCallee CGObjCGNU::GetPropertyGetFunction() {
|
|
return GetPropertyFn;
|
|
}
|
|
|
|
llvm::FunctionCallee CGObjCGNU::GetPropertySetFunction() {
|
|
return SetPropertyFn;
|
|
}
|
|
|
|
llvm::FunctionCallee CGObjCGNU::GetOptimizedPropertySetFunction(bool atomic,
|
|
bool copy) {
|
|
return nullptr;
|
|
}
|
|
|
|
llvm::FunctionCallee CGObjCGNU::GetGetStructFunction() {
|
|
return GetStructPropertyFn;
|
|
}
|
|
|
|
llvm::FunctionCallee CGObjCGNU::GetSetStructFunction() {
|
|
return SetStructPropertyFn;
|
|
}
|
|
|
|
llvm::FunctionCallee CGObjCGNU::GetCppAtomicObjectGetFunction() {
|
|
return nullptr;
|
|
}
|
|
|
|
llvm::FunctionCallee CGObjCGNU::GetCppAtomicObjectSetFunction() {
|
|
return nullptr;
|
|
}
|
|
|
|
llvm::FunctionCallee CGObjCGNU::EnumerationMutationFunction() {
|
|
return EnumerationMutationFn;
|
|
}
|
|
|
|
void CGObjCGNU::EmitSynchronizedStmt(CodeGenFunction &CGF,
|
|
const ObjCAtSynchronizedStmt &S) {
|
|
EmitAtSynchronizedStmt(CGF, S, SyncEnterFn, SyncExitFn);
|
|
}
|
|
|
|
|
|
void CGObjCGNU::EmitTryStmt(CodeGenFunction &CGF,
|
|
const ObjCAtTryStmt &S) {
|
|
// Unlike the Apple non-fragile runtimes, which also uses
|
|
// unwind-based zero cost exceptions, the GNU Objective C runtime's
|
|
// EH support isn't a veneer over C++ EH. Instead, exception
|
|
// objects are created by objc_exception_throw and destroyed by
|
|
// the personality function; this avoids the need for bracketing
|
|
// catch handlers with calls to __blah_begin_catch/__blah_end_catch
|
|
// (or even _Unwind_DeleteException), but probably doesn't
|
|
// interoperate very well with foreign exceptions.
|
|
//
|
|
// In Objective-C++ mode, we actually emit something equivalent to the C++
|
|
// exception handler.
|
|
EmitTryCatchStmt(CGF, S, EnterCatchFn, ExitCatchFn, ExceptionReThrowFn);
|
|
}
|
|
|
|
void CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF,
|
|
const ObjCAtThrowStmt &S,
|
|
bool ClearInsertionPoint) {
|
|
llvm::Value *ExceptionAsObject;
|
|
bool isRethrow = false;
|
|
|
|
if (const Expr *ThrowExpr = S.getThrowExpr()) {
|
|
llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr);
|
|
ExceptionAsObject = Exception;
|
|
} else {
|
|
assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) &&
|
|
"Unexpected rethrow outside @catch block.");
|
|
ExceptionAsObject = CGF.ObjCEHValueStack.back();
|
|
isRethrow = true;
|
|
}
|
|
if (isRethrow && usesSEHExceptions) {
|
|
// For SEH, ExceptionAsObject may be undef, because the catch handler is
|
|
// not passed it for catchalls and so it is not visible to the catch
|
|
// funclet. The real thrown object will still be live on the stack at this
|
|
// point and will be rethrown. If we are explicitly rethrowing the object
|
|
// that was passed into the `@catch` block, then this code path is not
|
|
// reached and we will instead call `objc_exception_throw` with an explicit
|
|
// argument.
|
|
llvm::CallBase *Throw = CGF.EmitRuntimeCallOrInvoke(ExceptionReThrowFn);
|
|
Throw->setDoesNotReturn();
|
|
}
|
|
else {
|
|
ExceptionAsObject = CGF.Builder.CreateBitCast(ExceptionAsObject, IdTy);
|
|
llvm::CallBase *Throw =
|
|
CGF.EmitRuntimeCallOrInvoke(ExceptionThrowFn, ExceptionAsObject);
|
|
Throw->setDoesNotReturn();
|
|
}
|
|
CGF.Builder.CreateUnreachable();
|
|
if (ClearInsertionPoint)
|
|
CGF.Builder.ClearInsertionPoint();
|
|
}
|
|
|
|
llvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGenFunction &CGF,
|
|
Address AddrWeakObj) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
AddrWeakObj = EnforceType(B, AddrWeakObj, PtrToIdTy);
|
|
return B.CreateCall(WeakReadFn, AddrWeakObj.getPointer());
|
|
}
|
|
|
|
void CGObjCGNU::EmitObjCWeakAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
src = EnforceType(B, src, IdTy);
|
|
dst = EnforceType(B, dst, PtrToIdTy);
|
|
B.CreateCall(WeakAssignFn, {src, dst.getPointer()});
|
|
}
|
|
|
|
void CGObjCGNU::EmitObjCGlobalAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst,
|
|
bool threadlocal) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
src = EnforceType(B, src, IdTy);
|
|
dst = EnforceType(B, dst, PtrToIdTy);
|
|
// FIXME. Add threadloca assign API
|
|
assert(!threadlocal && "EmitObjCGlobalAssign - Threal Local API NYI");
|
|
B.CreateCall(GlobalAssignFn, {src, dst.getPointer()});
|
|
}
|
|
|
|
void CGObjCGNU::EmitObjCIvarAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst,
|
|
llvm::Value *ivarOffset) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
src = EnforceType(B, src, IdTy);
|
|
dst = EnforceType(B, dst, IdTy);
|
|
B.CreateCall(IvarAssignFn, {src, dst.getPointer(), ivarOffset});
|
|
}
|
|
|
|
void CGObjCGNU::EmitObjCStrongCastAssign(CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dst) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
src = EnforceType(B, src, IdTy);
|
|
dst = EnforceType(B, dst, PtrToIdTy);
|
|
B.CreateCall(StrongCastAssignFn, {src, dst.getPointer()});
|
|
}
|
|
|
|
void CGObjCGNU::EmitGCMemmoveCollectable(CodeGenFunction &CGF,
|
|
Address DestPtr,
|
|
Address SrcPtr,
|
|
llvm::Value *Size) {
|
|
CGBuilderTy &B = CGF.Builder;
|
|
DestPtr = EnforceType(B, DestPtr, PtrTy);
|
|
SrcPtr = EnforceType(B, SrcPtr, PtrTy);
|
|
|
|
B.CreateCall(MemMoveFn, {DestPtr.getPointer(), SrcPtr.getPointer(), Size});
|
|
}
|
|
|
|
llvm::GlobalVariable *CGObjCGNU::ObjCIvarOffsetVariable(
|
|
const ObjCInterfaceDecl *ID,
|
|
const ObjCIvarDecl *Ivar) {
|
|
const std::string Name = GetIVarOffsetVariableName(ID, Ivar);
|
|
// Emit the variable and initialize it with what we think the correct value
|
|
// is. This allows code compiled with non-fragile ivars to work correctly
|
|
// when linked against code which isn't (most of the time).
|
|
llvm::GlobalVariable *IvarOffsetPointer = TheModule.getNamedGlobal(Name);
|
|
if (!IvarOffsetPointer)
|
|
IvarOffsetPointer = new llvm::GlobalVariable(TheModule,
|
|
llvm::Type::getInt32PtrTy(VMContext), false,
|
|
llvm::GlobalValue::ExternalLinkage, nullptr, Name);
|
|
return IvarOffsetPointer;
|
|
}
|
|
|
|
LValue CGObjCGNU::EmitObjCValueForIvar(CodeGenFunction &CGF,
|
|
QualType ObjectTy,
|
|
llvm::Value *BaseValue,
|
|
const ObjCIvarDecl *Ivar,
|
|
unsigned CVRQualifiers) {
|
|
const ObjCInterfaceDecl *ID =
|
|
ObjectTy->castAs<ObjCObjectType>()->getInterface();
|
|
return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers,
|
|
EmitIvarOffset(CGF, ID, Ivar));
|
|
}
|
|
|
|
static const ObjCInterfaceDecl *FindIvarInterface(ASTContext &Context,
|
|
const ObjCInterfaceDecl *OID,
|
|
const ObjCIvarDecl *OIVD) {
|
|
for (const ObjCIvarDecl *next = OID->all_declared_ivar_begin(); next;
|
|
next = next->getNextIvar()) {
|
|
if (OIVD == next)
|
|
return OID;
|
|
}
|
|
|
|
// Otherwise check in the super class.
|
|
if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
|
|
return FindIvarInterface(Context, Super, OIVD);
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
llvm::Value *CGObjCGNU::EmitIvarOffset(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *Interface,
|
|
const ObjCIvarDecl *Ivar) {
|
|
if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
|
|
Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar);
|
|
|
|
// The MSVC linker cannot have a single global defined as LinkOnceAnyLinkage
|
|
// and ExternalLinkage, so create a reference to the ivar global and rely on
|
|
// the definition being created as part of GenerateClass.
|
|
if (RuntimeVersion < 10 ||
|
|
CGF.CGM.getTarget().getTriple().isKnownWindowsMSVCEnvironment())
|
|
return CGF.Builder.CreateZExtOrBitCast(
|
|
CGF.Builder.CreateAlignedLoad(
|
|
Int32Ty, CGF.Builder.CreateAlignedLoad(
|
|
llvm::Type::getInt32PtrTy(VMContext),
|
|
ObjCIvarOffsetVariable(Interface, Ivar),
|
|
CGF.getPointerAlign(), "ivar"),
|
|
CharUnits::fromQuantity(4)),
|
|
PtrDiffTy);
|
|
std::string name = "__objc_ivar_offset_value_" +
|
|
Interface->getNameAsString() +"." + Ivar->getNameAsString();
|
|
CharUnits Align = CGM.getIntAlign();
|
|
llvm::Value *Offset = TheModule.getGlobalVariable(name);
|
|
if (!Offset) {
|
|
auto GV = new llvm::GlobalVariable(TheModule, IntTy,
|
|
false, llvm::GlobalValue::LinkOnceAnyLinkage,
|
|
llvm::Constant::getNullValue(IntTy), name);
|
|
GV->setAlignment(Align.getAsAlign());
|
|
Offset = GV;
|
|
}
|
|
Offset = CGF.Builder.CreateAlignedLoad(IntTy, Offset, Align);
|
|
if (Offset->getType() != PtrDiffTy)
|
|
Offset = CGF.Builder.CreateZExtOrBitCast(Offset, PtrDiffTy);
|
|
return Offset;
|
|
}
|
|
uint64_t Offset = ComputeIvarBaseOffset(CGF.CGM, Interface, Ivar);
|
|
return llvm::ConstantInt::get(PtrDiffTy, Offset, /*isSigned*/true);
|
|
}
|
|
|
|
CGObjCRuntime *
|
|
clang::CodeGen::CreateGNUObjCRuntime(CodeGenModule &CGM) {
|
|
auto Runtime = CGM.getLangOpts().ObjCRuntime;
|
|
switch (Runtime.getKind()) {
|
|
case ObjCRuntime::GNUstep:
|
|
if (Runtime.getVersion() >= VersionTuple(2, 0))
|
|
return new CGObjCGNUstep2(CGM);
|
|
return new CGObjCGNUstep(CGM);
|
|
|
|
case ObjCRuntime::GCC:
|
|
return new CGObjCGCC(CGM);
|
|
|
|
case ObjCRuntime::ObjFW:
|
|
return new CGObjCObjFW(CGM);
|
|
|
|
case ObjCRuntime::FragileMacOSX:
|
|
case ObjCRuntime::MacOSX:
|
|
case ObjCRuntime::iOS:
|
|
case ObjCRuntime::WatchOS:
|
|
llvm_unreachable("these runtimes are not GNU runtimes");
|
|
}
|
|
llvm_unreachable("bad runtime");
|
|
}
|