diff options
Diffstat (limited to 'gnu/llvm/tools/clang/lib/CodeGen/CGObjCRuntime.cpp')
| -rw-r--r-- | gnu/llvm/tools/clang/lib/CodeGen/CGObjCRuntime.cpp | 388 |
1 files changed, 0 insertions, 388 deletions
diff --git a/gnu/llvm/tools/clang/lib/CodeGen/CGObjCRuntime.cpp b/gnu/llvm/tools/clang/lib/CodeGen/CGObjCRuntime.cpp deleted file mode 100644 index 4b6f24a03f2..00000000000 --- a/gnu/llvm/tools/clang/lib/CodeGen/CGObjCRuntime.cpp +++ /dev/null @@ -1,388 +0,0 @@ -//==- CGObjCRuntime.cpp - Interface to Shared Objective-C Runtime Features ==// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This abstract class defines the interface for Objective-C runtime-specific -// code generation. It provides some concrete helper methods for functionality -// shared between all (or most) of the Objective-C runtimes supported by clang. -// -//===----------------------------------------------------------------------===// - -#include "CGObjCRuntime.h" -#include "CGCleanup.h" -#include "CGCXXABI.h" -#include "CGRecordLayout.h" -#include "CodeGenFunction.h" -#include "CodeGenModule.h" -#include "clang/AST/RecordLayout.h" -#include "clang/AST/StmtObjC.h" -#include "clang/CodeGen/CGFunctionInfo.h" -#include "llvm/IR/CallSite.h" -#include "llvm/Support/SaveAndRestore.h" - -using namespace clang; -using namespace CodeGen; - -uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM, - const ObjCInterfaceDecl *OID, - const ObjCIvarDecl *Ivar) { - return CGM.getContext().lookupFieldBitOffset(OID, nullptr, Ivar) / - CGM.getContext().getCharWidth(); -} - -uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM, - const ObjCImplementationDecl *OID, - const ObjCIvarDecl *Ivar) { - return CGM.getContext().lookupFieldBitOffset(OID->getClassInterface(), OID, - Ivar) / - CGM.getContext().getCharWidth(); -} - -unsigned CGObjCRuntime::ComputeBitfieldBitOffset( - CodeGen::CodeGenModule &CGM, - const ObjCInterfaceDecl *ID, - const ObjCIvarDecl *Ivar) { - return CGM.getContext().lookupFieldBitOffset(ID, ID->getImplementation(), - Ivar); -} - -LValue CGObjCRuntime::EmitValueForIvarAtOffset(CodeGen::CodeGenFunction &CGF, - const ObjCInterfaceDecl *OID, - llvm::Value *BaseValue, - const ObjCIvarDecl *Ivar, - unsigned CVRQualifiers, - llvm::Value *Offset) { - // Compute (type*) ( (char *) BaseValue + Offset) - QualType InterfaceTy{OID->getTypeForDecl(), 0}; - QualType ObjectPtrTy = - CGF.CGM.getContext().getObjCObjectPointerType(InterfaceTy); - QualType IvarTy = - Ivar->getUsageType(ObjectPtrTy).withCVRQualifiers(CVRQualifiers); - llvm::Type *LTy = CGF.CGM.getTypes().ConvertTypeForMem(IvarTy); - llvm::Value *V = CGF.Builder.CreateBitCast(BaseValue, CGF.Int8PtrTy); - V = CGF.Builder.CreateInBoundsGEP(V, Offset, "add.ptr"); - - if (!Ivar->isBitField()) { - V = CGF.Builder.CreateBitCast(V, llvm::PointerType::getUnqual(LTy)); - LValue LV = CGF.MakeNaturalAlignAddrLValue(V, IvarTy); - return LV; - } - - // We need to compute an access strategy for this bit-field. We are given the - // offset to the first byte in the bit-field, the sub-byte offset is taken - // from the original layout. We reuse the normal bit-field access strategy by - // treating this as an access to a struct where the bit-field is in byte 0, - // and adjust the containing type size as appropriate. - // - // FIXME: Note that currently we make a very conservative estimate of the - // alignment of the bit-field, because (a) it is not clear what guarantees the - // runtime makes us, and (b) we don't have a way to specify that the struct is - // at an alignment plus offset. - // - // Note, there is a subtle invariant here: we can only call this routine on - // non-synthesized ivars but we may be called for synthesized ivars. However, - // a synthesized ivar can never be a bit-field, so this is safe. - uint64_t FieldBitOffset = - CGF.CGM.getContext().lookupFieldBitOffset(OID, nullptr, Ivar); - uint64_t BitOffset = FieldBitOffset % CGF.CGM.getContext().getCharWidth(); - uint64_t AlignmentBits = CGF.CGM.getTarget().getCharAlign(); - uint64_t BitFieldSize = Ivar->getBitWidthValue(CGF.getContext()); - CharUnits StorageSize = CGF.CGM.getContext().toCharUnitsFromBits( - llvm::alignTo(BitOffset + BitFieldSize, AlignmentBits)); - CharUnits Alignment = CGF.CGM.getContext().toCharUnitsFromBits(AlignmentBits); - - // Allocate a new CGBitFieldInfo object to describe this access. - // - // FIXME: This is incredibly wasteful, these should be uniqued or part of some - // layout object. However, this is blocked on other cleanups to the - // Objective-C code, so for now we just live with allocating a bunch of these - // objects. - CGBitFieldInfo *Info = new (CGF.CGM.getContext()) CGBitFieldInfo( - CGBitFieldInfo::MakeInfo(CGF.CGM.getTypes(), Ivar, BitOffset, BitFieldSize, - CGF.CGM.getContext().toBits(StorageSize), - CharUnits::fromQuantity(0))); - - Address Addr(V, Alignment); - Addr = CGF.Builder.CreateElementBitCast(Addr, - llvm::Type::getIntNTy(CGF.getLLVMContext(), - Info->StorageSize)); - return LValue::MakeBitfield(Addr, *Info, IvarTy, - LValueBaseInfo(AlignmentSource::Decl), - TBAAAccessInfo()); -} - -namespace { - struct CatchHandler { - const VarDecl *Variable; - const Stmt *Body; - llvm::BasicBlock *Block; - llvm::Constant *TypeInfo; - /// Flags used to differentiate cleanups and catchalls in Windows SEH - unsigned Flags; - }; - - struct CallObjCEndCatch final : EHScopeStack::Cleanup { - CallObjCEndCatch(bool MightThrow, llvm::Value *Fn) - : MightThrow(MightThrow), Fn(Fn) {} - bool MightThrow; - llvm::Value *Fn; - - void Emit(CodeGenFunction &CGF, Flags flags) override { - if (MightThrow) - CGF.EmitRuntimeCallOrInvoke(Fn); - else - CGF.EmitNounwindRuntimeCall(Fn); - } - }; -} - - -void CGObjCRuntime::EmitTryCatchStmt(CodeGenFunction &CGF, - const ObjCAtTryStmt &S, - llvm::Constant *beginCatchFn, - llvm::Constant *endCatchFn, - llvm::Constant *exceptionRethrowFn) { - // Jump destination for falling out of catch bodies. - CodeGenFunction::JumpDest Cont; - if (S.getNumCatchStmts()) - Cont = CGF.getJumpDestInCurrentScope("eh.cont"); - - bool useFunclets = EHPersonality::get(CGF).usesFuncletPads(); - - CodeGenFunction::FinallyInfo FinallyInfo; - if (!useFunclets) - if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt()) - FinallyInfo.enter(CGF, Finally->getFinallyBody(), - beginCatchFn, endCatchFn, exceptionRethrowFn); - - SmallVector<CatchHandler, 8> Handlers; - - - // Enter the catch, if there is one. - if (S.getNumCatchStmts()) { - for (unsigned I = 0, N = S.getNumCatchStmts(); I != N; ++I) { - const ObjCAtCatchStmt *CatchStmt = S.getCatchStmt(I); - const VarDecl *CatchDecl = CatchStmt->getCatchParamDecl(); - - Handlers.push_back(CatchHandler()); - CatchHandler &Handler = Handlers.back(); - Handler.Variable = CatchDecl; - Handler.Body = CatchStmt->getCatchBody(); - Handler.Block = CGF.createBasicBlock("catch"); - Handler.Flags = 0; - - // @catch(...) always matches. - if (!CatchDecl) { - auto catchAll = getCatchAllTypeInfo(); - Handler.TypeInfo = catchAll.RTTI; - Handler.Flags = catchAll.Flags; - // Don't consider any other catches. - break; - } - - Handler.TypeInfo = GetEHType(CatchDecl->getType()); - } - - EHCatchScope *Catch = CGF.EHStack.pushCatch(Handlers.size()); - for (unsigned I = 0, E = Handlers.size(); I != E; ++I) - Catch->setHandler(I, { Handlers[I].TypeInfo, Handlers[I].Flags }, Handlers[I].Block); - } - - if (useFunclets) - if (const ObjCAtFinallyStmt *Finally = S.getFinallyStmt()) { - CodeGenFunction HelperCGF(CGM, /*suppressNewContext=*/true); - if (!CGF.CurSEHParent) - CGF.CurSEHParent = cast<NamedDecl>(CGF.CurFuncDecl); - // Outline the finally block. - const Stmt *FinallyBlock = Finally->getFinallyBody(); - HelperCGF.startOutlinedSEHHelper(CGF, /*isFilter*/false, FinallyBlock); - - // Emit the original filter expression, convert to i32, and return. - HelperCGF.EmitStmt(FinallyBlock); - - HelperCGF.FinishFunction(FinallyBlock->getEndLoc()); - - llvm::Function *FinallyFunc = HelperCGF.CurFn; - - - // Push a cleanup for __finally blocks. - CGF.pushSEHCleanup(NormalAndEHCleanup, FinallyFunc); - } - - - // Emit the try body. - CGF.EmitStmt(S.getTryBody()); - - // Leave the try. - if (S.getNumCatchStmts()) - CGF.popCatchScope(); - - // Remember where we were. - CGBuilderTy::InsertPoint SavedIP = CGF.Builder.saveAndClearIP(); - - // Emit the handlers. - for (unsigned I = 0, E = Handlers.size(); I != E; ++I) { - CatchHandler &Handler = Handlers[I]; - - CGF.EmitBlock(Handler.Block); - llvm::CatchPadInst *CPI = nullptr; - SaveAndRestore<llvm::Instruction *> RestoreCurrentFuncletPad(CGF.CurrentFuncletPad); - if (useFunclets) - if ((CPI = dyn_cast_or_null<llvm::CatchPadInst>(Handler.Block->getFirstNonPHI()))) { - CGF.CurrentFuncletPad = CPI; - CPI->setOperand(2, CGF.getExceptionSlot().getPointer()); - } - llvm::Value *RawExn = CGF.getExceptionFromSlot(); - - // Enter the catch. - llvm::Value *Exn = RawExn; - if (beginCatchFn) - Exn = CGF.EmitNounwindRuntimeCall(beginCatchFn, RawExn, "exn.adjusted"); - - CodeGenFunction::LexicalScope cleanups(CGF, Handler.Body->getSourceRange()); - - if (endCatchFn) { - // Add a cleanup to leave the catch. - bool EndCatchMightThrow = (Handler.Variable == nullptr); - - CGF.EHStack.pushCleanup<CallObjCEndCatch>(NormalAndEHCleanup, - EndCatchMightThrow, - endCatchFn); - } - - // Bind the catch parameter if it exists. - if (const VarDecl *CatchParam = Handler.Variable) { - llvm::Type *CatchType = CGF.ConvertType(CatchParam->getType()); - llvm::Value *CastExn = CGF.Builder.CreateBitCast(Exn, CatchType); - - CGF.EmitAutoVarDecl(*CatchParam); - EmitInitOfCatchParam(CGF, CastExn, CatchParam); - } - if (CPI) - CGF.EHStack.pushCleanup<CatchRetScope>(NormalCleanup, CPI); - - CGF.ObjCEHValueStack.push_back(Exn); - CGF.EmitStmt(Handler.Body); - CGF.ObjCEHValueStack.pop_back(); - - // Leave any cleanups associated with the catch. - cleanups.ForceCleanup(); - - CGF.EmitBranchThroughCleanup(Cont); - } - - // Go back to the try-statement fallthrough. - CGF.Builder.restoreIP(SavedIP); - - // Pop out of the finally. - if (!useFunclets && S.getFinallyStmt()) - FinallyInfo.exit(CGF); - - if (Cont.isValid()) - CGF.EmitBlock(Cont.getBlock()); -} - -void CGObjCRuntime::EmitInitOfCatchParam(CodeGenFunction &CGF, - llvm::Value *exn, - const VarDecl *paramDecl) { - - Address paramAddr = CGF.GetAddrOfLocalVar(paramDecl); - - switch (paramDecl->getType().getQualifiers().getObjCLifetime()) { - case Qualifiers::OCL_Strong: - exn = CGF.EmitARCRetainNonBlock(exn); - LLVM_FALLTHROUGH; - - case Qualifiers::OCL_None: - case Qualifiers::OCL_ExplicitNone: - case Qualifiers::OCL_Autoreleasing: - CGF.Builder.CreateStore(exn, paramAddr); - return; - - case Qualifiers::OCL_Weak: - CGF.EmitARCInitWeak(paramAddr, exn); - return; - } - llvm_unreachable("invalid ownership qualifier"); -} - -namespace { - struct CallSyncExit final : EHScopeStack::Cleanup { - llvm::Value *SyncExitFn; - llvm::Value *SyncArg; - CallSyncExit(llvm::Value *SyncExitFn, llvm::Value *SyncArg) - : SyncExitFn(SyncExitFn), SyncArg(SyncArg) {} - - void Emit(CodeGenFunction &CGF, Flags flags) override { - CGF.EmitNounwindRuntimeCall(SyncExitFn, SyncArg); - } - }; -} - -void CGObjCRuntime::EmitAtSynchronizedStmt(CodeGenFunction &CGF, - const ObjCAtSynchronizedStmt &S, - llvm::Function *syncEnterFn, - llvm::Function *syncExitFn) { - 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; - if (CGF.getLangOpts().ObjCAutoRefCount) { - lock = CGF.EmitARCRetainScalarExpr(lockExpr); - lock = CGF.EmitObjCConsumeObject(lockExpr->getType(), lock); - } else { - lock = CGF.EmitScalarExpr(lockExpr); - } - lock = CGF.Builder.CreateBitCast(lock, CGF.VoidPtrTy); - - // Acquire the lock. - CGF.Builder.CreateCall(syncEnterFn, lock)->setDoesNotThrow(); - - // Register an all-paths cleanup to release the lock. - CGF.EHStack.pushCleanup<CallSyncExit>(NormalAndEHCleanup, syncExitFn, lock); - - // Emit the body of the statement. - CGF.EmitStmt(S.getSynchBody()); -} - -/// 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 -/// \param callArgs - the actual arguments, including implicit ones -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(); - - const CGFunctionInfo &signatureForCall = - CGM.getTypes().arrangeCall(signature, callArgs); - - return MessageSendInfo(signatureForCall, signatureType); - } - - // There's no method; just use a default CC. - const CGFunctionInfo &argsInfo = - CGM.getTypes().arrangeUnprototypedObjCMessageSend(resultType, callArgs); - - // Derive the signature to call from that. - llvm::PointerType *signatureType = - CGM.getTypes().GetFunctionType(argsInfo)->getPointerTo(); - return MessageSendInfo(argsInfo, signatureType); -} |