2011-03-25 19:57:33 +08:00
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//==- CGObjCRuntime.cpp - Interface to Shared Objective-C Runtime Features ==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This abstract class defines the interface for Objective-C runtime-specific
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// code generation. It provides some concrete helper methods for functionality
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// shared between all (or most) of the Objective-C runtimes supported by clang.
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//
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//===----------------------------------------------------------------------===//
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#include "CGObjCRuntime.h"
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2012-12-04 17:13:33 +08:00
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#include "CGCleanup.h"
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2011-03-25 19:57:33 +08:00
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#include "CGRecordLayout.h"
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#include "CodeGenFunction.h"
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2012-12-04 17:13:33 +08:00
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#include "CodeGenModule.h"
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2011-03-25 19:57:33 +08:00
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/StmtObjC.h"
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#include "llvm/Support/CallSite.h"
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using namespace clang;
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using namespace CodeGen;
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static uint64_t LookupFieldBitOffset(CodeGen::CodeGenModule &CGM,
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const ObjCInterfaceDecl *OID,
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const ObjCImplementationDecl *ID,
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const ObjCIvarDecl *Ivar) {
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const ObjCInterfaceDecl *Container = Ivar->getContainingInterface();
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// FIXME: We should eliminate the need to have ObjCImplementationDecl passed
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// in here; it should never be necessary because that should be the lexical
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// decl context for the ivar.
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// If we know have an implementation (and the ivar is in it) then
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// look up in the implementation layout.
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const ASTRecordLayout *RL;
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2011-12-15 08:29:59 +08:00
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if (ID && declaresSameEntity(ID->getClassInterface(), Container))
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2011-03-25 19:57:33 +08:00
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RL = &CGM.getContext().getASTObjCImplementationLayout(ID);
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else
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RL = &CGM.getContext().getASTObjCInterfaceLayout(Container);
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// Compute field index.
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//
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// FIXME: The index here is closely tied to how ASTContext::getObjCLayout is
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// implemented. This should be fixed to get the information from the layout
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// directly.
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unsigned Index = 0;
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2011-06-29 02:05:25 +08:00
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2011-07-22 10:08:32 +08:00
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for (const ObjCIvarDecl *IVD = Container->all_declared_ivar_begin();
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2011-06-29 02:05:25 +08:00
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IVD; IVD = IVD->getNextIvar()) {
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if (Ivar == IVD)
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2011-03-25 19:57:33 +08:00
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break;
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++Index;
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}
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assert(Index < RL->getFieldCount() && "Ivar is not inside record layout!");
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return RL->getFieldOffset(Index);
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}
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2012-11-07 06:15:52 +08:00
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uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
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const ObjCInterfaceDecl *OID,
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const ObjCIvarDecl *Ivar) {
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return LookupFieldBitOffset(CGM, OID, 0, Ivar) /
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CGM.getContext().getCharWidth();
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2011-03-25 19:57:33 +08:00
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}
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2012-11-07 06:15:52 +08:00
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uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
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const ObjCImplementationDecl *OID,
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const ObjCIvarDecl *Ivar) {
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return LookupFieldBitOffset(CGM, OID->getClassInterface(), OID, Ivar) /
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CGM.getContext().getCharWidth();
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2011-03-25 19:57:33 +08:00
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}
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2012-11-07 07:40:48 +08:00
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unsigned CGObjCRuntime::ComputeBitfieldBitOffset(
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CodeGen::CodeGenModule &CGM,
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const ObjCInterfaceDecl *ID,
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const ObjCIvarDecl *Ivar) {
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return LookupFieldBitOffset(CGM, ID, ID->getImplementation(), Ivar);
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}
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2011-03-25 19:57:33 +08:00
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LValue CGObjCRuntime::EmitValueForIvarAtOffset(CodeGen::CodeGenFunction &CGF,
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const ObjCInterfaceDecl *OID,
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llvm::Value *BaseValue,
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const ObjCIvarDecl *Ivar,
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unsigned CVRQualifiers,
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llvm::Value *Offset) {
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// Compute (type*) ( (char *) BaseValue + Offset)
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QualType IvarTy = Ivar->getType();
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2011-07-18 12:24:23 +08:00
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llvm::Type *LTy = CGF.CGM.getTypes().ConvertTypeForMem(IvarTy);
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2012-12-06 19:14:44 +08:00
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llvm::Value *V = CGF.Builder.CreateBitCast(BaseValue, CGF.Int8PtrTy);
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2011-03-25 19:57:33 +08:00
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V = CGF.Builder.CreateInBoundsGEP(V, Offset, "add.ptr");
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if (!Ivar->isBitField()) {
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2012-12-06 19:14:44 +08:00
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V = CGF.Builder.CreateBitCast(V, llvm::PointerType::getUnqual(LTy));
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2011-12-20 07:03:09 +08:00
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LValue LV = CGF.MakeNaturalAlignAddrLValue(V, IvarTy);
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2011-03-25 19:57:33 +08:00
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LV.getQuals().addCVRQualifiers(CVRQualifiers);
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return LV;
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}
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// We need to compute an access strategy for this bit-field. We are given the
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// offset to the first byte in the bit-field, the sub-byte offset is taken
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// from the original layout. We reuse the normal bit-field access strategy by
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// treating this as an access to a struct where the bit-field is in byte 0,
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// and adjust the containing type size as appropriate.
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//
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// FIXME: Note that currently we make a very conservative estimate of the
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// alignment of the bit-field, because (a) it is not clear what guarantees the
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// runtime makes us, and (b) we don't have a way to specify that the struct is
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// at an alignment plus offset.
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//
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// Note, there is a subtle invariant here: we can only call this routine on
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// non-synthesized ivars but we may be called for synthesized ivars. However,
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// a synthesized ivar can never be a bit-field, so this is safe.
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uint64_t FieldBitOffset = LookupFieldBitOffset(CGF.CGM, OID, 0, Ivar);
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2011-04-23 01:23:43 +08:00
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uint64_t BitOffset = FieldBitOffset % CGF.CGM.getContext().getCharWidth();
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2012-12-06 19:14:44 +08:00
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uint64_t AlignmentBits = CGF.CGM.getContext().getTargetInfo().getCharAlign();
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2011-10-11 02:28:20 +08:00
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uint64_t BitFieldSize = Ivar->getBitWidthValue(CGF.getContext());
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2012-12-06 19:14:44 +08:00
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CharUnits StorageSize =
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CGF.CGM.getContext().toCharUnitsFromBits(
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llvm::RoundUpToAlignment(BitOffset + BitFieldSize, AlignmentBits));
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CharUnits Alignment = CGF.CGM.getContext().toCharUnitsFromBits(AlignmentBits);
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2011-03-25 19:57:33 +08:00
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// Allocate a new CGBitFieldInfo object to describe this access.
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//
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// FIXME: This is incredibly wasteful, these should be uniqued or part of some
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// layout object. However, this is blocked on other cleanups to the
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// Objective-C code, so for now we just live with allocating a bunch of these
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// objects.
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CGBitFieldInfo *Info = new (CGF.CGM.getContext()) CGBitFieldInfo(
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CGBitFieldInfo::MakeInfo(CGF.CGM.getTypes(), Ivar, BitOffset, BitFieldSize,
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2012-12-06 19:14:44 +08:00
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CGF.CGM.getContext().toBits(StorageSize),
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Alignment.getQuantity()));
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2011-03-25 19:57:33 +08:00
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2012-12-06 19:14:44 +08:00
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V = CGF.Builder.CreateBitCast(V,
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llvm::Type::getIntNPtrTy(CGF.getLLVMContext(),
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Info->StorageSize));
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2011-03-25 19:57:33 +08:00
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return LValue::MakeBitfield(V, *Info,
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2012-06-28 05:19:48 +08:00
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IvarTy.withCVRQualifiers(CVRQualifiers),
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2012-12-06 19:14:44 +08:00
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Alignment);
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2011-03-25 19:57:33 +08:00
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}
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namespace {
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struct CatchHandler {
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const VarDecl *Variable;
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const Stmt *Body;
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llvm::BasicBlock *Block;
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llvm::Value *TypeInfo;
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};
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struct CallObjCEndCatch : EHScopeStack::Cleanup {
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CallObjCEndCatch(bool MightThrow, llvm::Value *Fn) :
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MightThrow(MightThrow), Fn(Fn) {}
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bool MightThrow;
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llvm::Value *Fn;
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2011-07-13 04:27:29 +08:00
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void Emit(CodeGenFunction &CGF, Flags flags) {
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2011-03-25 19:57:33 +08:00
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if (!MightThrow) {
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CGF.Builder.CreateCall(Fn)->setDoesNotThrow();
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return;
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}
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2011-07-15 16:37:34 +08:00
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CGF.EmitCallOrInvoke(Fn);
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2011-03-25 19:57:33 +08:00
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}
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};
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}
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void CGObjCRuntime::EmitTryCatchStmt(CodeGenFunction &CGF,
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const ObjCAtTryStmt &S,
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2011-05-24 06:33:28 +08:00
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llvm::Constant *beginCatchFn,
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llvm::Constant *endCatchFn,
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llvm::Constant *exceptionRethrowFn) {
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2011-03-25 19:57:33 +08:00
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// Jump destination for falling out of catch bodies.
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CodeGenFunction::JumpDest Cont;
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if (S.getNumCatchStmts())
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Cont = CGF.getJumpDestInCurrentScope("eh.cont");
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CodeGenFunction::FinallyInfo FinallyInfo;
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if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt())
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2011-06-22 10:32:12 +08:00
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FinallyInfo.enter(CGF, Finally->getFinallyBody(),
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beginCatchFn, endCatchFn, exceptionRethrowFn);
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2011-03-25 19:57:33 +08:00
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2011-07-23 18:55:15 +08:00
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SmallVector<CatchHandler, 8> Handlers;
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2011-03-25 19:57:33 +08:00
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// Enter the catch, if there is one.
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if (S.getNumCatchStmts()) {
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for (unsigned I = 0, N = S.getNumCatchStmts(); I != N; ++I) {
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const ObjCAtCatchStmt *CatchStmt = S.getCatchStmt(I);
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const VarDecl *CatchDecl = CatchStmt->getCatchParamDecl();
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Handlers.push_back(CatchHandler());
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CatchHandler &Handler = Handlers.back();
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Handler.Variable = CatchDecl;
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Handler.Body = CatchStmt->getCatchBody();
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Handler.Block = CGF.createBasicBlock("catch");
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// @catch(...) always matches.
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if (!CatchDecl) {
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Handler.TypeInfo = 0; // catch-all
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// Don't consider any other catches.
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break;
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}
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Handler.TypeInfo = GetEHType(CatchDecl->getType());
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}
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EHCatchScope *Catch = CGF.EHStack.pushCatch(Handlers.size());
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for (unsigned I = 0, E = Handlers.size(); I != E; ++I)
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Catch->setHandler(I, Handlers[I].TypeInfo, Handlers[I].Block);
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}
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// Emit the try body.
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CGF.EmitStmt(S.getTryBody());
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// Leave the try.
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if (S.getNumCatchStmts())
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2011-08-11 10:22:43 +08:00
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CGF.popCatchScope();
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2011-03-25 19:57:33 +08:00
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// Remember where we were.
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CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP();
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// Emit the handlers.
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for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
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CatchHandler &Handler = Handlers[I];
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CGF.EmitBlock(Handler.Block);
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2011-09-16 02:57:19 +08:00
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llvm::Value *RawExn = CGF.getExceptionFromSlot();
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2011-03-25 19:57:33 +08:00
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// Enter the catch.
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llvm::Value *Exn = RawExn;
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if (beginCatchFn) {
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Exn = CGF.Builder.CreateCall(beginCatchFn, RawExn, "exn.adjusted");
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cast<llvm::CallInst>(Exn)->setDoesNotThrow();
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}
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2011-10-19 08:44:01 +08:00
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CodeGenFunction::LexicalScope cleanups(CGF, Handler.Body->getSourceRange());
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2011-05-12 09:00:15 +08:00
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2011-03-25 19:57:33 +08:00
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if (endCatchFn) {
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// Add a cleanup to leave the catch.
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bool EndCatchMightThrow = (Handler.Variable == 0);
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CGF.EHStack.pushCleanup<CallObjCEndCatch>(NormalAndEHCleanup,
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EndCatchMightThrow,
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endCatchFn);
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}
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// Bind the catch parameter if it exists.
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if (const VarDecl *CatchParam = Handler.Variable) {
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2011-07-18 12:24:23 +08:00
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llvm::Type *CatchType = CGF.ConvertType(CatchParam->getType());
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2011-03-25 19:57:33 +08:00
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llvm::Value *CastExn = CGF.Builder.CreateBitCast(Exn, CatchType);
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CGF.EmitAutoVarDecl(*CatchParam);
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2012-01-18 04:16:56 +08:00
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llvm::Value *CatchParamAddr = CGF.GetAddrOfLocalVar(CatchParam);
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switch (CatchParam->getType().getQualifiers().getObjCLifetime()) {
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case Qualifiers::OCL_Strong:
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CastExn = CGF.EmitARCRetainNonBlock(CastExn);
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// fallthrough
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case Qualifiers::OCL_None:
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case Qualifiers::OCL_ExplicitNone:
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case Qualifiers::OCL_Autoreleasing:
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CGF.Builder.CreateStore(CastExn, CatchParamAddr);
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break;
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case Qualifiers::OCL_Weak:
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CGF.EmitARCInitWeak(CatchParamAddr, CastExn);
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break;
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}
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2011-03-25 19:57:33 +08:00
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}
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CGF.ObjCEHValueStack.push_back(Exn);
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CGF.EmitStmt(Handler.Body);
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CGF.ObjCEHValueStack.pop_back();
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2011-05-12 09:00:15 +08:00
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// Leave any cleanups associated with the catch.
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cleanups.ForceCleanup();
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2011-03-25 19:57:33 +08:00
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CGF.EmitBranchThroughCleanup(Cont);
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}
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// Go back to the try-statement fallthrough.
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CGF.Builder.restoreIP(SavedIP);
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2011-06-22 10:32:12 +08:00
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// Pop out of the finally.
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2011-03-25 19:57:33 +08:00
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if (S.getFinallyStmt())
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2011-06-22 10:32:12 +08:00
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FinallyInfo.exit(CGF);
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2011-03-25 19:57:33 +08:00
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if (Cont.isValid())
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CGF.EmitBlock(Cont.getBlock());
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}
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namespace {
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struct CallSyncExit : EHScopeStack::Cleanup {
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llvm::Value *SyncExitFn;
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llvm::Value *SyncArg;
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CallSyncExit(llvm::Value *SyncExitFn, llvm::Value *SyncArg)
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: SyncExitFn(SyncExitFn), SyncArg(SyncArg) {}
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2011-07-13 04:27:29 +08:00
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void Emit(CodeGenFunction &CGF, Flags flags) {
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2011-03-25 19:57:33 +08:00
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CGF.Builder.CreateCall(SyncExitFn, SyncArg)->setDoesNotThrow();
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}
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};
|
|
|
|
}
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|
|
|
|
|
|
|
void CGObjCRuntime::EmitAtSynchronizedStmt(CodeGenFunction &CGF,
|
|
|
|
const ObjCAtSynchronizedStmt &S,
|
|
|
|
llvm::Function *syncEnterFn,
|
|
|
|
llvm::Function *syncExitFn) {
|
2011-07-28 05:50:02 +08:00
|
|
|
CodeGenFunction::RunCleanupsScope cleanups(CGF);
|
|
|
|
|
|
|
|
// Evaluate the lock operand. This is guaranteed to dominate the
|
|
|
|
// ARC release and lock-release cleanups.
|
|
|
|
const Expr *lockExpr = S.getSynchExpr();
|
|
|
|
llvm::Value *lock;
|
2012-03-11 15:00:24 +08:00
|
|
|
if (CGF.getLangOpts().ObjCAutoRefCount) {
|
2011-07-28 05:50:02 +08:00
|
|
|
lock = CGF.EmitARCRetainScalarExpr(lockExpr);
|
|
|
|
lock = CGF.EmitObjCConsumeObject(lockExpr->getType(), lock);
|
|
|
|
} else {
|
|
|
|
lock = CGF.EmitScalarExpr(lockExpr);
|
|
|
|
}
|
|
|
|
lock = CGF.Builder.CreateBitCast(lock, CGF.VoidPtrTy);
|
2011-03-25 19:57:33 +08:00
|
|
|
|
|
|
|
// Acquire the lock.
|
2011-07-28 05:50:02 +08:00
|
|
|
CGF.Builder.CreateCall(syncEnterFn, lock)->setDoesNotThrow();
|
2011-03-25 19:57:33 +08:00
|
|
|
|
|
|
|
// Register an all-paths cleanup to release the lock.
|
2011-07-28 05:50:02 +08:00
|
|
|
CGF.EHStack.pushCleanup<CallSyncExit>(NormalAndEHCleanup, syncExitFn, lock);
|
2011-03-25 19:57:33 +08:00
|
|
|
|
|
|
|
// Emit the body of the statement.
|
|
|
|
CGF.EmitStmt(S.getSynchBody());
|
|
|
|
}
|
2012-02-17 11:33:10 +08:00
|
|
|
|
|
|
|
/// Compute the pointer-to-function type to which a message send
|
|
|
|
/// should be casted in order to correctly call the given method
|
|
|
|
/// with the given arguments.
|
|
|
|
///
|
|
|
|
/// \param method - may be null
|
|
|
|
/// \param resultType - the result type to use if there's no method
|
2012-06-15 17:02:08 +08:00
|
|
|
/// \param callArgs - the actual arguments, including implicit ones
|
2012-02-17 11:33:10 +08:00
|
|
|
CGObjCRuntime::MessageSendInfo
|
|
|
|
CGObjCRuntime::getMessageSendInfo(const ObjCMethodDecl *method,
|
|
|
|
QualType resultType,
|
|
|
|
CallArgList &callArgs) {
|
|
|
|
// If there's a method, use information from that.
|
|
|
|
if (method) {
|
|
|
|
const CGFunctionInfo &signature =
|
|
|
|
CGM.getTypes().arrangeObjCMessageSendSignature(method, callArgs[0].Ty);
|
|
|
|
|
|
|
|
llvm::PointerType *signatureType =
|
|
|
|
CGM.getTypes().GetFunctionType(signature)->getPointerTo();
|
|
|
|
|
|
|
|
// If that's not variadic, there's no need to recompute the ABI
|
|
|
|
// arrangement.
|
|
|
|
if (!signature.isVariadic())
|
|
|
|
return MessageSendInfo(signature, signatureType);
|
|
|
|
|
|
|
|
// Otherwise, there is.
|
|
|
|
FunctionType::ExtInfo einfo = signature.getExtInfo();
|
|
|
|
const CGFunctionInfo &argsInfo =
|
2012-07-07 14:41:13 +08:00
|
|
|
CGM.getTypes().arrangeFreeFunctionCall(resultType, callArgs, einfo,
|
|
|
|
signature.getRequiredArgs());
|
2012-02-17 11:33:10 +08:00
|
|
|
|
|
|
|
return MessageSendInfo(argsInfo, signatureType);
|
|
|
|
}
|
|
|
|
|
|
|
|
// There's no method; just use a default CC.
|
|
|
|
const CGFunctionInfo &argsInfo =
|
2012-07-07 14:41:13 +08:00
|
|
|
CGM.getTypes().arrangeFreeFunctionCall(resultType, callArgs,
|
|
|
|
FunctionType::ExtInfo(),
|
|
|
|
RequiredArgs::All);
|
2012-02-17 11:33:10 +08:00
|
|
|
|
|
|
|
// Derive the signature to call from that.
|
|
|
|
llvm::PointerType *signatureType =
|
|
|
|
CGM.getTypes().GetFunctionType(argsInfo)->getPointerTo();
|
|
|
|
return MessageSendInfo(argsInfo, signatureType);
|
|
|
|
}
|