forked from OSchip/llvm-project
310 lines
13 KiB
C++
310 lines
13 KiB
C++
//===----- CGObjCRuntime.h - Interface to ObjC Runtimes ---------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This provides an abstract class for Objective-C code generation. Concrete
|
|
// subclasses of this implement code generation for specific Objective-C
|
|
// runtime libraries.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CLANG_LIB_CODEGEN_CGOBJCRUNTIME_H
|
|
#define LLVM_CLANG_LIB_CODEGEN_CGOBJCRUNTIME_H
|
|
#include "CGBuilder.h"
|
|
#include "CGCall.h"
|
|
#include "CGValue.h"
|
|
#include "clang/AST/DeclObjC.h"
|
|
#include "clang/Basic/IdentifierTable.h" // Selector
|
|
|
|
namespace llvm {
|
|
class Constant;
|
|
class Function;
|
|
class Module;
|
|
class StructLayout;
|
|
class StructType;
|
|
class Type;
|
|
class Value;
|
|
}
|
|
|
|
namespace clang {
|
|
namespace CodeGen {
|
|
class CodeGenFunction;
|
|
}
|
|
|
|
class FieldDecl;
|
|
class ObjCAtTryStmt;
|
|
class ObjCAtThrowStmt;
|
|
class ObjCAtSynchronizedStmt;
|
|
class ObjCContainerDecl;
|
|
class ObjCCategoryImplDecl;
|
|
class ObjCImplementationDecl;
|
|
class ObjCInterfaceDecl;
|
|
class ObjCMessageExpr;
|
|
class ObjCMethodDecl;
|
|
class ObjCProtocolDecl;
|
|
class Selector;
|
|
class ObjCIvarDecl;
|
|
class ObjCStringLiteral;
|
|
class BlockDeclRefExpr;
|
|
|
|
namespace CodeGen {
|
|
class CodeGenModule;
|
|
class CGBlockInfo;
|
|
|
|
// FIXME: Several methods should be pure virtual but aren't to avoid the
|
|
// partially-implemented subclass breaking.
|
|
|
|
/// Implements runtime-specific code generation functions.
|
|
class CGObjCRuntime {
|
|
protected:
|
|
CodeGen::CodeGenModule &CGM;
|
|
CGObjCRuntime(CodeGen::CodeGenModule &CGM) : CGM(CGM) {}
|
|
|
|
// Utility functions for unified ivar access. These need to
|
|
// eventually be folded into other places (the structure layout
|
|
// code).
|
|
|
|
/// Compute an offset to the given ivar, suitable for passing to
|
|
/// EmitValueForIvarAtOffset. Note that the correct handling of
|
|
/// bit-fields is carefully coordinated by these two, use caution!
|
|
///
|
|
/// The latter overload is suitable for computing the offset of a
|
|
/// sythesized ivar.
|
|
uint64_t ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
|
|
const ObjCInterfaceDecl *OID,
|
|
const ObjCIvarDecl *Ivar);
|
|
uint64_t ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
|
|
const ObjCImplementationDecl *OID,
|
|
const ObjCIvarDecl *Ivar);
|
|
|
|
LValue EmitValueForIvarAtOffset(CodeGen::CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *OID,
|
|
llvm::Value *BaseValue,
|
|
const ObjCIvarDecl *Ivar,
|
|
unsigned CVRQualifiers,
|
|
llvm::Value *Offset);
|
|
/// Emits a try / catch statement. This function is intended to be called by
|
|
/// subclasses, and provides a generic mechanism for generating these, which
|
|
/// should be usable by all runtimes. The caller must provide the functions
|
|
/// to call when entering and exiting a \@catch() block, and the function
|
|
/// used to rethrow exceptions. If the begin and end catch functions are
|
|
/// NULL, then the function assumes that the EH personality function provides
|
|
/// the thrown object directly.
|
|
void EmitTryCatchStmt(CodeGenFunction &CGF,
|
|
const ObjCAtTryStmt &S,
|
|
llvm::Constant *beginCatchFn,
|
|
llvm::Constant *endCatchFn,
|
|
llvm::Constant *exceptionRethrowFn);
|
|
|
|
void EmitInitOfCatchParam(CodeGenFunction &CGF, llvm::Value *exn,
|
|
const VarDecl *paramDecl);
|
|
|
|
/// Emits an \@synchronize() statement, using the \p syncEnterFn and
|
|
/// \p syncExitFn arguments as the functions called to lock and unlock
|
|
/// the object. This function can be called by subclasses that use
|
|
/// zero-cost exception handling.
|
|
void EmitAtSynchronizedStmt(CodeGenFunction &CGF,
|
|
const ObjCAtSynchronizedStmt &S,
|
|
llvm::Function *syncEnterFn,
|
|
llvm::Function *syncExitFn);
|
|
|
|
public:
|
|
virtual ~CGObjCRuntime();
|
|
|
|
/// Generate the function required to register all Objective-C components in
|
|
/// this compilation unit with the runtime library.
|
|
virtual llvm::Function *ModuleInitFunction() = 0;
|
|
|
|
/// Get a selector for the specified name and type values.
|
|
/// The result should have the LLVM type for ASTContext::getObjCSelType().
|
|
virtual llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) = 0;
|
|
|
|
/// Get the address of a selector for the specified name and type values.
|
|
/// This is a rarely-used language extension, but sadly it exists.
|
|
///
|
|
/// The result should have the LLVM type for a pointer to
|
|
/// ASTContext::getObjCSelType().
|
|
virtual Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) = 0;
|
|
|
|
/// Get a typed selector.
|
|
virtual llvm::Value *GetSelector(CodeGenFunction &CGF,
|
|
const ObjCMethodDecl *Method) = 0;
|
|
|
|
/// Get the type constant to catch for the given ObjC pointer type.
|
|
/// This is used externally to implement catching ObjC types in C++.
|
|
/// Runtimes which don't support this should add the appropriate
|
|
/// error to Sema.
|
|
virtual llvm::Constant *GetEHType(QualType T) = 0;
|
|
|
|
/// Generate a constant string object.
|
|
virtual ConstantAddress GenerateConstantString(const StringLiteral *) = 0;
|
|
|
|
/// Generate a category. A category contains a list of methods (and
|
|
/// accompanying metadata) and a list of protocols.
|
|
virtual void GenerateCategory(const ObjCCategoryImplDecl *OCD) = 0;
|
|
|
|
/// Generate a class structure for this class.
|
|
virtual void GenerateClass(const ObjCImplementationDecl *OID) = 0;
|
|
|
|
/// Register an class alias.
|
|
virtual void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) = 0;
|
|
|
|
/// Generate an Objective-C message send operation.
|
|
///
|
|
/// \param Method - The method being called, this may be null if synthesizing
|
|
/// a property setter or getter.
|
|
virtual CodeGen::RValue
|
|
GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
|
|
ReturnValueSlot ReturnSlot,
|
|
QualType ResultType,
|
|
Selector Sel,
|
|
llvm::Value *Receiver,
|
|
const CallArgList &CallArgs,
|
|
const ObjCInterfaceDecl *Class = nullptr,
|
|
const ObjCMethodDecl *Method = nullptr) = 0;
|
|
|
|
/// Generate an Objective-C message send operation to the super
|
|
/// class initiated in a method for Class and with the given Self
|
|
/// object.
|
|
///
|
|
/// \param Method - The method being called, this may be null if synthesizing
|
|
/// a property setter or getter.
|
|
virtual CodeGen::RValue
|
|
GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
|
|
ReturnValueSlot ReturnSlot,
|
|
QualType ResultType,
|
|
Selector Sel,
|
|
const ObjCInterfaceDecl *Class,
|
|
bool isCategoryImpl,
|
|
llvm::Value *Self,
|
|
bool IsClassMessage,
|
|
const CallArgList &CallArgs,
|
|
const ObjCMethodDecl *Method = nullptr) = 0;
|
|
|
|
/// Emit the code to return the named protocol as an object, as in a
|
|
/// \@protocol expression.
|
|
virtual llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF,
|
|
const ObjCProtocolDecl *OPD) = 0;
|
|
|
|
/// Generate the named protocol. Protocols contain method metadata but no
|
|
/// implementations.
|
|
virtual void GenerateProtocol(const ObjCProtocolDecl *OPD) = 0;
|
|
|
|
/// Generate a function preamble for a method with the specified
|
|
/// types.
|
|
|
|
// FIXME: Current this just generates the Function definition, but really this
|
|
// should also be generating the loads of the parameters, as the runtime
|
|
// should have full control over how parameters are passed.
|
|
virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD,
|
|
const ObjCContainerDecl *CD) = 0;
|
|
|
|
/// Return the runtime function for getting properties.
|
|
virtual llvm::Constant *GetPropertyGetFunction() = 0;
|
|
|
|
/// Return the runtime function for setting properties.
|
|
virtual llvm::Constant *GetPropertySetFunction() = 0;
|
|
|
|
/// Return the runtime function for optimized setting properties.
|
|
virtual llvm::Constant *GetOptimizedPropertySetFunction(bool atomic,
|
|
bool copy) = 0;
|
|
|
|
// API for atomic copying of qualified aggregates in getter.
|
|
virtual llvm::Constant *GetGetStructFunction() = 0;
|
|
// API for atomic copying of qualified aggregates in setter.
|
|
virtual llvm::Constant *GetSetStructFunction() = 0;
|
|
/// API for atomic copying of qualified aggregates with non-trivial copy
|
|
/// assignment (c++) in setter.
|
|
virtual llvm::Constant *GetCppAtomicObjectSetFunction() = 0;
|
|
/// API for atomic copying of qualified aggregates with non-trivial copy
|
|
/// assignment (c++) in getter.
|
|
virtual llvm::Constant *GetCppAtomicObjectGetFunction() = 0;
|
|
|
|
/// GetClass - Return a reference to the class for the given
|
|
/// interface decl.
|
|
virtual llvm::Value *GetClass(CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *OID) = 0;
|
|
|
|
|
|
virtual llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) {
|
|
llvm_unreachable("autoreleasepool unsupported in this ABI");
|
|
}
|
|
|
|
/// EnumerationMutationFunction - Return the function that's called by the
|
|
/// compiler when a mutation is detected during foreach iteration.
|
|
virtual llvm::Constant *EnumerationMutationFunction() = 0;
|
|
|
|
virtual void EmitSynchronizedStmt(CodeGen::CodeGenFunction &CGF,
|
|
const ObjCAtSynchronizedStmt &S) = 0;
|
|
virtual void EmitTryStmt(CodeGen::CodeGenFunction &CGF,
|
|
const ObjCAtTryStmt &S) = 0;
|
|
virtual void EmitThrowStmt(CodeGen::CodeGenFunction &CGF,
|
|
const ObjCAtThrowStmt &S,
|
|
bool ClearInsertionPoint=true) = 0;
|
|
virtual llvm::Value *EmitObjCWeakRead(CodeGen::CodeGenFunction &CGF,
|
|
Address AddrWeakObj) = 0;
|
|
virtual void EmitObjCWeakAssign(CodeGen::CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dest) = 0;
|
|
virtual void EmitObjCGlobalAssign(CodeGen::CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dest,
|
|
bool threadlocal=false) = 0;
|
|
virtual void EmitObjCIvarAssign(CodeGen::CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dest,
|
|
llvm::Value *ivarOffset) = 0;
|
|
virtual void EmitObjCStrongCastAssign(CodeGen::CodeGenFunction &CGF,
|
|
llvm::Value *src, Address dest) = 0;
|
|
|
|
virtual LValue EmitObjCValueForIvar(CodeGen::CodeGenFunction &CGF,
|
|
QualType ObjectTy,
|
|
llvm::Value *BaseValue,
|
|
const ObjCIvarDecl *Ivar,
|
|
unsigned CVRQualifiers) = 0;
|
|
virtual llvm::Value *EmitIvarOffset(CodeGen::CodeGenFunction &CGF,
|
|
const ObjCInterfaceDecl *Interface,
|
|
const ObjCIvarDecl *Ivar) = 0;
|
|
virtual void EmitGCMemmoveCollectable(CodeGen::CodeGenFunction &CGF,
|
|
Address DestPtr,
|
|
Address SrcPtr,
|
|
llvm::Value *Size) = 0;
|
|
virtual llvm::Constant *BuildGCBlockLayout(CodeGen::CodeGenModule &CGM,
|
|
const CodeGen::CGBlockInfo &blockInfo) = 0;
|
|
virtual llvm::Constant *BuildRCBlockLayout(CodeGen::CodeGenModule &CGM,
|
|
const CodeGen::CGBlockInfo &blockInfo) = 0;
|
|
|
|
/// Returns an i8* which points to the byref layout information.
|
|
virtual llvm::Constant *BuildByrefLayout(CodeGen::CodeGenModule &CGM,
|
|
QualType T) = 0;
|
|
|
|
struct MessageSendInfo {
|
|
const CGFunctionInfo &CallInfo;
|
|
llvm::PointerType *MessengerType;
|
|
|
|
MessageSendInfo(const CGFunctionInfo &callInfo,
|
|
llvm::PointerType *messengerType)
|
|
: CallInfo(callInfo), MessengerType(messengerType) {}
|
|
};
|
|
|
|
MessageSendInfo getMessageSendInfo(const ObjCMethodDecl *method,
|
|
QualType resultType,
|
|
CallArgList &callArgs);
|
|
|
|
// FIXME: This probably shouldn't be here, but the code to compute
|
|
// it is here.
|
|
unsigned ComputeBitfieldBitOffset(CodeGen::CodeGenModule &CGM,
|
|
const ObjCInterfaceDecl *ID,
|
|
const ObjCIvarDecl *Ivar);
|
|
};
|
|
|
|
/// Creates an instance of an Objective-C runtime class.
|
|
//TODO: This should include some way of selecting which runtime to target.
|
|
CGObjCRuntime *CreateGNUObjCRuntime(CodeGenModule &CGM);
|
|
CGObjCRuntime *CreateMacObjCRuntime(CodeGenModule &CGM);
|
|
}
|
|
}
|
|
#endif
|