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Diffstat (limited to 'contrib/llvm/tools/clang/lib/CodeGen/CodeGenFunction.h')
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diff --git a/contrib/llvm/tools/clang/lib/CodeGen/CodeGenFunction.h b/contrib/llvm/tools/clang/lib/CodeGen/CodeGenFunction.h new file mode 100644 index 0000000..5ee3db0 --- /dev/null +++ b/contrib/llvm/tools/clang/lib/CodeGen/CodeGenFunction.h @@ -0,0 +1,1629 @@ +//===-- CodeGenFunction.h - Per-Function state for LLVM CodeGen -*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This is the internal per-function state used for llvm translation. +// +//===----------------------------------------------------------------------===// + +#ifndef CLANG_CODEGEN_CODEGENFUNCTION_H +#define CLANG_CODEGEN_CODEGENFUNCTION_H + +#include "clang/AST/Type.h" +#include "clang/AST/ExprCXX.h" +#include "clang/AST/ExprObjC.h" +#include "clang/AST/CharUnits.h" +#include "clang/Basic/TargetInfo.h" +#include "llvm/ADT/DenseMap.h" +#include "llvm/ADT/SmallVector.h" +#include "llvm/Support/ValueHandle.h" +#include "CodeGenModule.h" +#include "CGBlocks.h" +#include "CGBuilder.h" +#include "CGCall.h" +#include "CGCXX.h" +#include "CGValue.h" + +namespace llvm { + class BasicBlock; + class LLVMContext; + class MDNode; + class Module; + class SwitchInst; + class Twine; + class Value; + class CallSite; +} + +namespace clang { + class ASTContext; + class CXXDestructorDecl; + class CXXTryStmt; + class Decl; + class EnumConstantDecl; + class FunctionDecl; + class FunctionProtoType; + class LabelStmt; + class ObjCContainerDecl; + class ObjCInterfaceDecl; + class ObjCIvarDecl; + class ObjCMethodDecl; + class ObjCImplementationDecl; + class ObjCPropertyImplDecl; + class TargetInfo; + class TargetCodeGenInfo; + class VarDecl; + class ObjCForCollectionStmt; + class ObjCAtTryStmt; + class ObjCAtThrowStmt; + class ObjCAtSynchronizedStmt; + +namespace CodeGen { + class CodeGenTypes; + class CGDebugInfo; + class CGFunctionInfo; + class CGRecordLayout; + class CGBlockInfo; + +/// A branch fixup. These are required when emitting a goto to a +/// label which hasn't been emitted yet. The goto is optimistically +/// emitted as a branch to the basic block for the label, and (if it +/// occurs in a scope with non-trivial cleanups) a fixup is added to +/// the innermost cleanup. When a (normal) cleanup is popped, any +/// unresolved fixups in that scope are threaded through the cleanup. +struct BranchFixup { + /// The origin of the branch. Any switch-index stores required by + /// cleanup threading are added before this instruction. + llvm::Instruction *Origin; + + /// The destination of the branch. + /// + /// This can be set to null to indicate that this fixup was + /// successfully resolved. + llvm::BasicBlock *Destination; + + /// The last branch of the fixup. It is an invariant that + /// LatestBranch->getSuccessor(LatestBranchIndex) == Destination. + /// + /// The branch is always either a BranchInst or a SwitchInst. + llvm::TerminatorInst *LatestBranch; + unsigned LatestBranchIndex; +}; + +enum CleanupKind { NormalAndEHCleanup, EHCleanup, NormalCleanup }; + +/// A stack of scopes which respond to exceptions, including cleanups +/// and catch blocks. +class EHScopeStack { +public: + /// A saved depth on the scope stack. This is necessary because + /// pushing scopes onto the stack invalidates iterators. + class stable_iterator { + friend class EHScopeStack; + + /// Offset from StartOfData to EndOfBuffer. + ptrdiff_t Size; + + stable_iterator(ptrdiff_t Size) : Size(Size) {} + + public: + static stable_iterator invalid() { return stable_iterator(-1); } + stable_iterator() : Size(-1) {} + + bool isValid() const { return Size >= 0; } + + friend bool operator==(stable_iterator A, stable_iterator B) { + return A.Size == B.Size; + } + friend bool operator!=(stable_iterator A, stable_iterator B) { + return A.Size != B.Size; + } + }; + + /// A lazy cleanup. Subclasses must be POD-like: cleanups will + /// not be destructed, and they will be allocated on the cleanup + /// stack and freely copied and moved around. + /// + /// LazyCleanup implementations should generally be declared in an + /// anonymous namespace. + class LazyCleanup { + public: + // Anchor the construction vtable. We use the destructor because + // gcc gives an obnoxious warning if there are virtual methods + // with an accessible non-virtual destructor. Unfortunately, + // declaring this destructor makes it non-trivial, but there + // doesn't seem to be any other way around this warning. + // + // This destructor will never be called. + virtual ~LazyCleanup(); + + /// Emit the cleanup. For normal cleanups, this is run in the + /// same EH context as when the cleanup was pushed, i.e. the + /// immediately-enclosing context of the cleanup scope. For + /// EH cleanups, this is run in a terminate context. + /// + // \param IsForEHCleanup true if this is for an EH cleanup, false + /// if for a normal cleanup. + virtual void Emit(CodeGenFunction &CGF, bool IsForEHCleanup) = 0; + }; + +private: + // The implementation for this class is in CGException.h and + // CGException.cpp; the definition is here because it's used as a + // member of CodeGenFunction. + + /// The start of the scope-stack buffer, i.e. the allocated pointer + /// for the buffer. All of these pointers are either simultaneously + /// null or simultaneously valid. + char *StartOfBuffer; + + /// The end of the buffer. + char *EndOfBuffer; + + /// The first valid entry in the buffer. + char *StartOfData; + + /// The innermost normal cleanup on the stack. + stable_iterator InnermostNormalCleanup; + + /// The innermost EH cleanup on the stack. + stable_iterator InnermostEHCleanup; + + /// The number of catches on the stack. + unsigned CatchDepth; + + /// The current set of branch fixups. A branch fixup is a jump to + /// an as-yet unemitted label, i.e. a label for which we don't yet + /// know the EH stack depth. Whenever we pop a cleanup, we have + /// to thread all the current branch fixups through it. + /// + /// Fixups are recorded as the Use of the respective branch or + /// switch statement. The use points to the final destination. + /// When popping out of a cleanup, these uses are threaded through + /// the cleanup and adjusted to point to the new cleanup. + /// + /// Note that branches are allowed to jump into protected scopes + /// in certain situations; e.g. the following code is legal: + /// struct A { ~A(); }; // trivial ctor, non-trivial dtor + /// goto foo; + /// A a; + /// foo: + /// bar(); + llvm::SmallVector<BranchFixup, 8> BranchFixups; + + char *allocate(size_t Size); + + void popNullFixups(); + + void *pushLazyCleanup(CleanupKind K, size_t DataSize); + +public: + EHScopeStack() : StartOfBuffer(0), EndOfBuffer(0), StartOfData(0), + InnermostNormalCleanup(stable_end()), + InnermostEHCleanup(stable_end()), + CatchDepth(0) {} + ~EHScopeStack() { delete[] StartOfBuffer; } + + // Variadic templates would make this not terrible. + + /// Push a lazily-created cleanup on the stack. + template <class T> + void pushLazyCleanup(CleanupKind Kind) { + void *Buffer = pushLazyCleanup(Kind, sizeof(T)); + LazyCleanup *Obj = new(Buffer) T(); + (void) Obj; + } + + /// Push a lazily-created cleanup on the stack. + template <class T, class A0> + void pushLazyCleanup(CleanupKind Kind, A0 a0) { + void *Buffer = pushLazyCleanup(Kind, sizeof(T)); + LazyCleanup *Obj = new(Buffer) T(a0); + (void) Obj; + } + + /// Push a lazily-created cleanup on the stack. + template <class T, class A0, class A1> + void pushLazyCleanup(CleanupKind Kind, A0 a0, A1 a1) { + void *Buffer = pushLazyCleanup(Kind, sizeof(T)); + LazyCleanup *Obj = new(Buffer) T(a0, a1); + (void) Obj; + } + + /// Push a lazily-created cleanup on the stack. + template <class T, class A0, class A1, class A2> + void pushLazyCleanup(CleanupKind Kind, A0 a0, A1 a1, A2 a2) { + void *Buffer = pushLazyCleanup(Kind, sizeof(T)); + LazyCleanup *Obj = new(Buffer) T(a0, a1, a2); + (void) Obj; + } + + /// Push a lazily-created cleanup on the stack. + template <class T, class A0, class A1, class A2, class A3> + void pushLazyCleanup(CleanupKind Kind, A0 a0, A1 a1, A2 a2, A3 a3) { + void *Buffer = pushLazyCleanup(Kind, sizeof(T)); + LazyCleanup *Obj = new(Buffer) T(a0, a1, a2, a3); + (void) Obj; + } + + /// Push a cleanup on the stack. + void pushCleanup(llvm::BasicBlock *NormalEntry, + llvm::BasicBlock *NormalExit, + llvm::BasicBlock *EHEntry, + llvm::BasicBlock *EHExit); + + /// Pops a cleanup scope off the stack. This should only be called + /// by CodeGenFunction::PopCleanupBlock. + void popCleanup(); + + /// Push a set of catch handlers on the stack. The catch is + /// uninitialized and will need to have the given number of handlers + /// set on it. + class EHCatchScope *pushCatch(unsigned NumHandlers); + + /// Pops a catch scope off the stack. + void popCatch(); + + /// Push an exceptions filter on the stack. + class EHFilterScope *pushFilter(unsigned NumFilters); + + /// Pops an exceptions filter off the stack. + void popFilter(); + + /// Push a terminate handler on the stack. + void pushTerminate(); + + /// Pops a terminate handler off the stack. + void popTerminate(); + + /// Determines whether the exception-scopes stack is empty. + bool empty() const { return StartOfData == EndOfBuffer; } + + bool requiresLandingPad() const { + return (CatchDepth || hasEHCleanups()); + } + + /// Determines whether there are any normal cleanups on the stack. + bool hasNormalCleanups() const { + return InnermostNormalCleanup != stable_end(); + } + + /// Returns the innermost normal cleanup on the stack, or + /// stable_end() if there are no normal cleanups. + stable_iterator getInnermostNormalCleanup() const { + return InnermostNormalCleanup; + } + + /// Determines whether there are any EH cleanups on the stack. + bool hasEHCleanups() const { + return InnermostEHCleanup != stable_end(); + } + + /// Returns the innermost EH cleanup on the stack, or stable_end() + /// if there are no EH cleanups. + stable_iterator getInnermostEHCleanup() const { + return InnermostEHCleanup; + } + + /// An unstable reference to a scope-stack depth. Invalidated by + /// pushes but not pops. + class iterator; + + /// Returns an iterator pointing to the innermost EH scope. + iterator begin() const; + + /// Returns an iterator pointing to the outermost EH scope. + iterator end() const; + + /// Create a stable reference to the top of the EH stack. The + /// returned reference is valid until that scope is popped off the + /// stack. + stable_iterator stable_begin() const { + return stable_iterator(EndOfBuffer - StartOfData); + } + + /// Create a stable reference to the bottom of the EH stack. + static stable_iterator stable_end() { + return stable_iterator(0); + } + + /// Translates an iterator into a stable_iterator. + stable_iterator stabilize(iterator it) const; + + /// Finds the nearest cleanup enclosing the given iterator. + /// Returns stable_iterator::invalid() if there are no such cleanups. + stable_iterator getEnclosingEHCleanup(iterator it) const; + + /// Turn a stable reference to a scope depth into a unstable pointer + /// to the EH stack. + iterator find(stable_iterator save) const; + + /// Removes the cleanup pointed to by the given stable_iterator. + void removeCleanup(stable_iterator save); + + /// Add a branch fixup to the current cleanup scope. + BranchFixup &addBranchFixup() { + assert(hasNormalCleanups() && "adding fixup in scope without cleanups"); + BranchFixups.push_back(BranchFixup()); + return BranchFixups.back(); + } + + unsigned getNumBranchFixups() const { return BranchFixups.size(); } + BranchFixup &getBranchFixup(unsigned I) { + assert(I < getNumBranchFixups()); + return BranchFixups[I]; + } + + /// Mark any branch fixups leading to the given block as resolved. + void resolveBranchFixups(llvm::BasicBlock *Dest); +}; + +/// CodeGenFunction - This class organizes the per-function state that is used +/// while generating LLVM code. +class CodeGenFunction : public BlockFunction { + CodeGenFunction(const CodeGenFunction&); // DO NOT IMPLEMENT + void operator=(const CodeGenFunction&); // DO NOT IMPLEMENT +public: + /// A jump destination is a pair of a basic block and a cleanup + /// depth. They are used to implement direct jumps across cleanup + /// scopes, e.g. goto, break, continue, and return. + struct JumpDest { + JumpDest() : Block(0), ScopeDepth() {} + JumpDest(llvm::BasicBlock *Block, EHScopeStack::stable_iterator Depth) + : Block(Block), ScopeDepth(Depth) {} + + llvm::BasicBlock *Block; + EHScopeStack::stable_iterator ScopeDepth; + }; + + CodeGenModule &CGM; // Per-module state. + const TargetInfo &Target; + + typedef std::pair<llvm::Value *, llvm::Value *> ComplexPairTy; + CGBuilderTy Builder; + + /// CurFuncDecl - Holds the Decl for the current function or ObjC method. + /// This excludes BlockDecls. + const Decl *CurFuncDecl; + /// CurCodeDecl - This is the inner-most code context, which includes blocks. + const Decl *CurCodeDecl; + const CGFunctionInfo *CurFnInfo; + QualType FnRetTy; + llvm::Function *CurFn; + + /// CurGD - The GlobalDecl for the current function being compiled. + GlobalDecl CurGD; + + /// ReturnBlock - Unified return block. + JumpDest ReturnBlock; + + /// ReturnValue - The temporary alloca to hold the return value. This is null + /// iff the function has no return value. + llvm::Value *ReturnValue; + + /// AllocaInsertPoint - This is an instruction in the entry block before which + /// we prefer to insert allocas. + llvm::AssertingVH<llvm::Instruction> AllocaInsertPt; + + // intptr_t, i32, i64 + const llvm::IntegerType *IntPtrTy, *Int32Ty, *Int64Ty; + uint32_t LLVMPointerWidth; + + bool Exceptions; + bool CatchUndefined; + + /// \brief A mapping from NRVO variables to the flags used to indicate + /// when the NRVO has been applied to this variable. + llvm::DenseMap<const VarDecl *, llvm::Value *> NRVOFlags; + + EHScopeStack EHStack; + + /// The exception slot. All landing pads write the current + /// exception pointer into this alloca. + llvm::Value *ExceptionSlot; + + /// Emits a landing pad for the current EH stack. + llvm::BasicBlock *EmitLandingPad(); + + llvm::BasicBlock *getInvokeDestImpl(); + +public: + /// ObjCEHValueStack - Stack of Objective-C exception values, used for + /// rethrows. + llvm::SmallVector<llvm::Value*, 8> ObjCEHValueStack; + + // A struct holding information about a finally block's IR + // generation. For now, doesn't actually hold anything. + struct FinallyInfo { + }; + + FinallyInfo EnterFinallyBlock(const Stmt *Stmt, + llvm::Constant *BeginCatchFn, + llvm::Constant *EndCatchFn, + llvm::Constant *RethrowFn); + void ExitFinallyBlock(FinallyInfo &FinallyInfo); + + /// PushDestructorCleanup - Push a cleanup to call the + /// complete-object destructor of an object of the given type at the + /// given address. Does nothing if T is not a C++ class type with a + /// non-trivial destructor. + void PushDestructorCleanup(QualType T, llvm::Value *Addr); + + /// PopCleanupBlock - Will pop the cleanup entry on the stack and + /// process all branch fixups. + void PopCleanupBlock(); + + /// CleanupBlock - RAII object that will create a cleanup block and + /// set the insert point to that block. When destructed, it sets the + /// insert point to the previous block and pushes a new cleanup + /// entry on the stack. + class CleanupBlock { + CodeGenFunction &CGF; + CGBuilderTy::InsertPoint SavedIP; + llvm::BasicBlock *NormalCleanupEntryBB; + llvm::BasicBlock *NormalCleanupExitBB; + llvm::BasicBlock *EHCleanupEntryBB; + + public: + CleanupBlock(CodeGenFunction &CGF, CleanupKind Kind); + + /// If we're currently writing a normal cleanup, tie that off and + /// start writing an EH cleanup. + void beginEHCleanup(); + + ~CleanupBlock(); + }; + + /// \brief Enters a new scope for capturing cleanups, all of which + /// will be executed once the scope is exited. + class RunCleanupsScope { + CodeGenFunction& CGF; + EHScopeStack::stable_iterator CleanupStackDepth; + bool OldDidCallStackSave; + bool PerformCleanup; + + RunCleanupsScope(const RunCleanupsScope &); // DO NOT IMPLEMENT + RunCleanupsScope &operator=(const RunCleanupsScope &); // DO NOT IMPLEMENT + + public: + /// \brief Enter a new cleanup scope. + explicit RunCleanupsScope(CodeGenFunction &CGF) + : CGF(CGF), PerformCleanup(true) + { + CleanupStackDepth = CGF.EHStack.stable_begin(); + OldDidCallStackSave = CGF.DidCallStackSave; + } + + /// \brief Exit this cleanup scope, emitting any accumulated + /// cleanups. + ~RunCleanupsScope() { + if (PerformCleanup) { + CGF.DidCallStackSave = OldDidCallStackSave; + CGF.PopCleanupBlocks(CleanupStackDepth); + } + } + + /// \brief Determine whether this scope requires any cleanups. + bool requiresCleanups() const { + return CGF.EHStack.stable_begin() != CleanupStackDepth; + } + + /// \brief Force the emission of cleanups now, instead of waiting + /// until this object is destroyed. + void ForceCleanup() { + assert(PerformCleanup && "Already forced cleanup"); + CGF.DidCallStackSave = OldDidCallStackSave; + CGF.PopCleanupBlocks(CleanupStackDepth); + PerformCleanup = false; + } + }; + + + /// PopCleanupBlocks - Takes the old cleanup stack size and emits + /// the cleanup blocks that have been added. + void PopCleanupBlocks(EHScopeStack::stable_iterator OldCleanupStackSize); + + /// The given basic block lies in the current EH scope, but may be a + /// target of a potentially scope-crossing jump; get a stable handle + /// to which we can perform this jump later. + JumpDest getJumpDestInCurrentScope(llvm::BasicBlock *Target) const { + return JumpDest(Target, EHStack.stable_begin()); + } + + /// The given basic block lies in the current EH scope, but may be a + /// target of a potentially scope-crossing jump; get a stable handle + /// to which we can perform this jump later. + JumpDest getJumpDestInCurrentScope(const char *Name = 0) { + return JumpDest(createBasicBlock(Name), EHStack.stable_begin()); + } + + /// EmitBranchThroughCleanup - Emit a branch from the current insert + /// block through the normal cleanup handling code (if any) and then + /// on to \arg Dest. + void EmitBranchThroughCleanup(JumpDest Dest); + + /// EmitBranchThroughEHCleanup - Emit a branch from the current + /// insert block through the EH cleanup handling code (if any) and + /// then on to \arg Dest. + void EmitBranchThroughEHCleanup(JumpDest Dest); + + /// BeginConditionalBranch - Should be called before a conditional part of an + /// expression is emitted. For example, before the RHS of the expression below + /// is emitted: + /// + /// b && f(T()); + /// + /// This is used to make sure that any temporaries created in the conditional + /// branch are only destroyed if the branch is taken. + void BeginConditionalBranch() { + ++ConditionalBranchLevel; + } + + /// EndConditionalBranch - Should be called after a conditional part of an + /// expression has been emitted. + void EndConditionalBranch() { + assert(ConditionalBranchLevel != 0 && + "Conditional branch mismatch!"); + + --ConditionalBranchLevel; + } + +private: + CGDebugInfo *DebugInfo; + + /// IndirectBranch - The first time an indirect goto is seen we create a block + /// with an indirect branch. Every time we see the address of a label taken, + /// we add the label to the indirect goto. Every subsequent indirect goto is + /// codegen'd as a jump to the IndirectBranch's basic block. + llvm::IndirectBrInst *IndirectBranch; + + /// LocalDeclMap - This keeps track of the LLVM allocas or globals for local C + /// decls. + llvm::DenseMap<const Decl*, llvm::Value*> LocalDeclMap; + + /// LabelMap - This keeps track of the LLVM basic block for each C label. + llvm::DenseMap<const LabelStmt*, JumpDest> LabelMap; + + // BreakContinueStack - This keeps track of where break and continue + // statements should jump to. + struct BreakContinue { + BreakContinue(JumpDest Break, JumpDest Continue) + : BreakBlock(Break), ContinueBlock(Continue) {} + + JumpDest BreakBlock; + JumpDest ContinueBlock; + }; + llvm::SmallVector<BreakContinue, 8> BreakContinueStack; + + /// SwitchInsn - This is nearest current switch instruction. It is null if if + /// current context is not in a switch. + llvm::SwitchInst *SwitchInsn; + + /// CaseRangeBlock - This block holds if condition check for last case + /// statement range in current switch instruction. + llvm::BasicBlock *CaseRangeBlock; + + /// InvokeDest - This is the nearest exception target for calls + /// which can unwind, when exceptions are being used. + llvm::BasicBlock *InvokeDest; + + // VLASizeMap - This keeps track of the associated size for each VLA type. + // We track this by the size expression rather than the type itself because + // in certain situations, like a const qualifier applied to an VLA typedef, + // multiple VLA types can share the same size expression. + // FIXME: Maybe this could be a stack of maps that is pushed/popped as we + // enter/leave scopes. + llvm::DenseMap<const Expr*, llvm::Value*> VLASizeMap; + + /// DidCallStackSave - Whether llvm.stacksave has been called. Used to avoid + /// calling llvm.stacksave for multiple VLAs in the same scope. + bool DidCallStackSave; + + /// A block containing a single 'unreachable' instruction. Created + /// lazily by getUnreachableBlock(). + llvm::BasicBlock *UnreachableBlock; + + /// CXXThisDecl - When generating code for a C++ member function, + /// this will hold the implicit 'this' declaration. + ImplicitParamDecl *CXXThisDecl; + llvm::Value *CXXThisValue; + + /// CXXVTTDecl - When generating code for a base object constructor or + /// base object destructor with virtual bases, this will hold the implicit + /// VTT parameter. + ImplicitParamDecl *CXXVTTDecl; + llvm::Value *CXXVTTValue; + + /// ConditionalBranchLevel - Contains the nesting level of the current + /// conditional branch. This is used so that we know if a temporary should be + /// destroyed conditionally. + unsigned ConditionalBranchLevel; + + + /// ByrefValueInfoMap - For each __block variable, contains a pair of the LLVM + /// type as well as the field number that contains the actual data. + llvm::DenseMap<const ValueDecl *, std::pair<const llvm::Type *, + unsigned> > ByRefValueInfo; + + /// getByrefValueFieldNumber - Given a declaration, returns the LLVM field + /// number that holds the value. + unsigned getByRefValueLLVMField(const ValueDecl *VD) const; + + llvm::BasicBlock *TerminateLandingPad; + llvm::BasicBlock *TerminateHandler; + llvm::BasicBlock *TrapBB; + +public: + CodeGenFunction(CodeGenModule &cgm); + + ASTContext &getContext() const; + CGDebugInfo *getDebugInfo() { return DebugInfo; } + + /// Returns a pointer to the function's exception object slot, which + /// is assigned in every landing pad. + llvm::Value *getExceptionSlot(); + + llvm::BasicBlock *getUnreachableBlock() { + if (!UnreachableBlock) { + UnreachableBlock = createBasicBlock("unreachable"); + new llvm::UnreachableInst(getLLVMContext(), UnreachableBlock); + } + return UnreachableBlock; + } + + llvm::BasicBlock *getInvokeDest() { + if (!EHStack.requiresLandingPad()) return 0; + return getInvokeDestImpl(); + } + + llvm::LLVMContext &getLLVMContext() { return VMContext; } + + //===--------------------------------------------------------------------===// + // Objective-C + //===--------------------------------------------------------------------===// + + void GenerateObjCMethod(const ObjCMethodDecl *OMD); + + void StartObjCMethod(const ObjCMethodDecl *MD, + const ObjCContainerDecl *CD); + + /// GenerateObjCGetter - Synthesize an Objective-C property getter function. + void GenerateObjCGetter(ObjCImplementationDecl *IMP, + const ObjCPropertyImplDecl *PID); + void GenerateObjCCtorDtorMethod(ObjCImplementationDecl *IMP, + ObjCMethodDecl *MD, bool ctor); + + /// GenerateObjCSetter - Synthesize an Objective-C property setter function + /// for the given property. + void GenerateObjCSetter(ObjCImplementationDecl *IMP, + const ObjCPropertyImplDecl *PID); + bool IndirectObjCSetterArg(const CGFunctionInfo &FI); + bool IvarTypeWithAggrGCObjects(QualType Ty); + + //===--------------------------------------------------------------------===// + // Block Bits + //===--------------------------------------------------------------------===// + + llvm::Value *BuildBlockLiteralTmp(const BlockExpr *); + llvm::Constant *BuildDescriptorBlockDecl(const BlockExpr *, + bool BlockHasCopyDispose, + CharUnits Size, + const llvm::StructType *, + std::vector<HelperInfo> *); + + llvm::Function *GenerateBlockFunction(GlobalDecl GD, + const BlockExpr *BExpr, + CGBlockInfo &Info, + const Decl *OuterFuncDecl, + llvm::DenseMap<const Decl*, llvm::Value*> ldm); + + llvm::Value *LoadBlockStruct(); + + void AllocateBlockCXXThisPointer(const CXXThisExpr *E); + void AllocateBlockDecl(const BlockDeclRefExpr *E); + llvm::Value *GetAddrOfBlockDecl(const BlockDeclRefExpr *E) { + return GetAddrOfBlockDecl(E->getDecl(), E->isByRef()); + } + llvm::Value *GetAddrOfBlockDecl(const ValueDecl *D, bool ByRef); + const llvm::Type *BuildByRefType(const ValueDecl *D); + + void GenerateCode(GlobalDecl GD, llvm::Function *Fn); + void StartFunction(GlobalDecl GD, QualType RetTy, + llvm::Function *Fn, + const FunctionArgList &Args, + SourceLocation StartLoc); + + void EmitConstructorBody(FunctionArgList &Args); + void EmitDestructorBody(FunctionArgList &Args); + void EmitFunctionBody(FunctionArgList &Args); + + /// EmitReturnBlock - Emit the unified return block, trying to avoid its + /// emission when possible. + void EmitReturnBlock(); + + /// FinishFunction - Complete IR generation of the current function. It is + /// legal to call this function even if there is no current insertion point. + void FinishFunction(SourceLocation EndLoc=SourceLocation()); + + /// GenerateThunk - Generate a thunk for the given method. + void GenerateThunk(llvm::Function *Fn, GlobalDecl GD, const ThunkInfo &Thunk); + + void EmitCtorPrologue(const CXXConstructorDecl *CD, CXXCtorType Type, + FunctionArgList &Args); + + /// InitializeVTablePointer - Initialize the vtable pointer of the given + /// subobject. + /// + void InitializeVTablePointer(BaseSubobject Base, + const CXXRecordDecl *NearestVBase, + uint64_t OffsetFromNearestVBase, + llvm::Constant *VTable, + const CXXRecordDecl *VTableClass); + + typedef llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBasesSetTy; + void InitializeVTablePointers(BaseSubobject Base, + const CXXRecordDecl *NearestVBase, + uint64_t OffsetFromNearestVBase, + bool BaseIsNonVirtualPrimaryBase, + llvm::Constant *VTable, + const CXXRecordDecl *VTableClass, + VisitedVirtualBasesSetTy& VBases); + + void InitializeVTablePointers(const CXXRecordDecl *ClassDecl); + + + /// EmitDtorEpilogue - Emit all code that comes at the end of class's + /// destructor. This is to call destructors on members and base classes in + /// reverse order of their construction. + void EmitDtorEpilogue(const CXXDestructorDecl *Dtor, + CXXDtorType Type); + + /// ShouldInstrumentFunction - Return true if the current function should be + /// instrumented with __cyg_profile_func_* calls + bool ShouldInstrumentFunction(); + + /// EmitFunctionInstrumentation - Emit LLVM code to call the specified + /// instrumentation function with the current function and the call site, if + /// function instrumentation is enabled. + void EmitFunctionInstrumentation(const char *Fn); + + /// EmitFunctionProlog - Emit the target specific LLVM code to load the + /// arguments for the given function. This is also responsible for naming the + /// LLVM function arguments. + void EmitFunctionProlog(const CGFunctionInfo &FI, + llvm::Function *Fn, + const FunctionArgList &Args); + + /// EmitFunctionEpilog - Emit the target specific LLVM code to return the + /// given temporary. + void EmitFunctionEpilog(const CGFunctionInfo &FI); + + /// EmitStartEHSpec - Emit the start of the exception spec. + void EmitStartEHSpec(const Decl *D); + + /// EmitEndEHSpec - Emit the end of the exception spec. + void EmitEndEHSpec(const Decl *D); + + /// getTerminateLandingPad - Return a landing pad that just calls terminate. + llvm::BasicBlock *getTerminateLandingPad(); + + /// getTerminateHandler - Return a handler (not a landing pad, just + /// a catch handler) that just calls terminate. This is used when + /// a terminate scope encloses a try. + llvm::BasicBlock *getTerminateHandler(); + + const llvm::Type *ConvertTypeForMem(QualType T); + const llvm::Type *ConvertType(QualType T); + const llvm::Type *ConvertType(const TypeDecl *T) { + return ConvertType(getContext().getTypeDeclType(T)); + } + + /// LoadObjCSelf - Load the value of self. This function is only valid while + /// generating code for an Objective-C method. + llvm::Value *LoadObjCSelf(); + + /// TypeOfSelfObject - Return type of object that this self represents. + QualType TypeOfSelfObject(); + + /// hasAggregateLLVMType - Return true if the specified AST type will map into + /// an aggregate LLVM type or is void. + static bool hasAggregateLLVMType(QualType T); + + /// createBasicBlock - Create an LLVM basic block. + llvm::BasicBlock *createBasicBlock(const char *Name="", + llvm::Function *Parent=0, + llvm::BasicBlock *InsertBefore=0) { +#ifdef NDEBUG + return llvm::BasicBlock::Create(VMContext, "", Parent, InsertBefore); +#else + return llvm::BasicBlock::Create(VMContext, Name, Parent, InsertBefore); +#endif + } + + /// getBasicBlockForLabel - Return the LLVM basicblock that the specified + /// label maps to. + JumpDest getJumpDestForLabel(const LabelStmt *S); + + /// SimplifyForwardingBlocks - If the given basic block is only a branch to + /// another basic block, simplify it. This assumes that no other code could + /// potentially reference the basic block. + void SimplifyForwardingBlocks(llvm::BasicBlock *BB); + + /// EmitBlock - Emit the given block \arg BB and set it as the insert point, + /// adding a fall-through branch from the current insert block if + /// necessary. It is legal to call this function even if there is no current + /// insertion point. + /// + /// IsFinished - If true, indicates that the caller has finished emitting + /// branches to the given block and does not expect to emit code into it. This + /// means the block can be ignored if it is unreachable. + void EmitBlock(llvm::BasicBlock *BB, bool IsFinished=false); + + /// EmitBranch - Emit a branch to the specified basic block from the current + /// insert block, taking care to avoid creation of branches from dummy + /// blocks. It is legal to call this function even if there is no current + /// insertion point. + /// + /// This function clears the current insertion point. The caller should follow + /// calls to this function with calls to Emit*Block prior to generation new + /// code. + void EmitBranch(llvm::BasicBlock *Block); + + /// HaveInsertPoint - True if an insertion point is defined. If not, this + /// indicates that the current code being emitted is unreachable. + bool HaveInsertPoint() const { + return Builder.GetInsertBlock() != 0; + } + + /// EnsureInsertPoint - Ensure that an insertion point is defined so that + /// emitted IR has a place to go. Note that by definition, if this function + /// creates a block then that block is unreachable; callers may do better to + /// detect when no insertion point is defined and simply skip IR generation. + void EnsureInsertPoint() { + if (!HaveInsertPoint()) + EmitBlock(createBasicBlock()); + } + + /// ErrorUnsupported - Print out an error that codegen doesn't support the + /// specified stmt yet. + void ErrorUnsupported(const Stmt *S, const char *Type, + bool OmitOnError=false); + + //===--------------------------------------------------------------------===// + // Helpers + //===--------------------------------------------------------------------===// + + Qualifiers MakeQualifiers(QualType T) { + Qualifiers Quals = getContext().getCanonicalType(T).getQualifiers(); + Quals.setObjCGCAttr(getContext().getObjCGCAttrKind(T)); + return Quals; + } + + /// CreateTempAlloca - This creates a alloca and inserts it into the entry + /// block. The caller is responsible for setting an appropriate alignment on + /// the alloca. + llvm::AllocaInst *CreateTempAlloca(const llvm::Type *Ty, + const llvm::Twine &Name = "tmp"); + + /// InitTempAlloca - Provide an initial value for the given alloca. + void InitTempAlloca(llvm::AllocaInst *Alloca, llvm::Value *Value); + + /// CreateIRTemp - Create a temporary IR object of the given type, with + /// appropriate alignment. This routine should only be used when an temporary + /// value needs to be stored into an alloca (for example, to avoid explicit + /// PHI construction), but the type is the IR type, not the type appropriate + /// for storing in memory. + llvm::AllocaInst *CreateIRTemp(QualType T, const llvm::Twine &Name = "tmp"); + + /// CreateMemTemp - Create a temporary memory object of the given type, with + /// appropriate alignment. + llvm::AllocaInst *CreateMemTemp(QualType T, const llvm::Twine &Name = "tmp"); + + /// EvaluateExprAsBool - Perform the usual unary conversions on the specified + /// expression and compare the result against zero, returning an Int1Ty value. + llvm::Value *EvaluateExprAsBool(const Expr *E); + + /// EmitAnyExpr - Emit code to compute the specified expression which can have + /// any type. The result is returned as an RValue struct. If this is an + /// aggregate expression, the aggloc/agglocvolatile arguments indicate where + /// the result should be returned. + /// + /// \param IgnoreResult - True if the resulting value isn't used. + RValue EmitAnyExpr(const Expr *E, llvm::Value *AggLoc = 0, + bool IsAggLocVolatile = false, bool IgnoreResult = false, + bool IsInitializer = false); + + // EmitVAListRef - Emit a "reference" to a va_list; this is either the address + // or the value of the expression, depending on how va_list is defined. + llvm::Value *EmitVAListRef(const Expr *E); + + /// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result will + /// always be accessible even if no aggregate location is provided. + RValue EmitAnyExprToTemp(const Expr *E, bool IsAggLocVolatile = false, + bool IsInitializer = false); + + /// EmitsAnyExprToMem - Emits the code necessary to evaluate an + /// arbitrary expression into the given memory location. + void EmitAnyExprToMem(const Expr *E, llvm::Value *Location, + bool IsLocationVolatile = false, + bool IsInitializer = false); + + /// EmitAggregateCopy - Emit an aggrate copy. + /// + /// \param isVolatile - True iff either the source or the destination is + /// volatile. + void EmitAggregateCopy(llvm::Value *DestPtr, llvm::Value *SrcPtr, + QualType EltTy, bool isVolatile=false); + + /// StartBlock - Start new block named N. If insert block is a dummy block + /// then reuse it. + void StartBlock(const char *N); + + /// GetAddrOfStaticLocalVar - Return the address of a static local variable. + llvm::Constant *GetAddrOfStaticLocalVar(const VarDecl *BVD); + + /// GetAddrOfLocalVar - Return the address of a local variable. + llvm::Value *GetAddrOfLocalVar(const VarDecl *VD); + + /// getAccessedFieldNo - Given an encoded value and a result number, return + /// the input field number being accessed. + static unsigned getAccessedFieldNo(unsigned Idx, const llvm::Constant *Elts); + + llvm::BlockAddress *GetAddrOfLabel(const LabelStmt *L); + llvm::BasicBlock *GetIndirectGotoBlock(); + + /// EmitNullInitialization - Generate code to set a value of the given type to + /// null, If the type contains data member pointers, they will be initialized + /// to -1 in accordance with the Itanium C++ ABI. + void EmitNullInitialization(llvm::Value *DestPtr, QualType Ty); + + // EmitVAArg - Generate code to get an argument from the passed in pointer + // and update it accordingly. The return value is a pointer to the argument. + // FIXME: We should be able to get rid of this method and use the va_arg + // instruction in LLVM instead once it works well enough. + llvm::Value *EmitVAArg(llvm::Value *VAListAddr, QualType Ty); + + /// EmitVLASize - Generate code for any VLA size expressions that might occur + /// in a variably modified type. If Ty is a VLA, will return the value that + /// corresponds to the size in bytes of the VLA type. Will return 0 otherwise. + /// + /// This function can be called with a null (unreachable) insert point. + llvm::Value *EmitVLASize(QualType Ty); + + // GetVLASize - Returns an LLVM value that corresponds to the size in bytes + // of a variable length array type. + llvm::Value *GetVLASize(const VariableArrayType *); + + /// LoadCXXThis - Load the value of 'this'. This function is only valid while + /// generating code for an C++ member function. + llvm::Value *LoadCXXThis() { + assert(CXXThisValue && "no 'this' value for this function"); + return CXXThisValue; + } + + /// LoadCXXVTT - Load the VTT parameter to base constructors/destructors have + /// virtual bases. + llvm::Value *LoadCXXVTT() { + assert(CXXVTTValue && "no VTT value for this function"); + return CXXVTTValue; + } + + /// GetAddressOfBaseOfCompleteClass - Convert the given pointer to a + /// complete class to the given direct base. + llvm::Value * + GetAddressOfDirectBaseInCompleteClass(llvm::Value *Value, + const CXXRecordDecl *Derived, + const CXXRecordDecl *Base, + bool BaseIsVirtual); + + /// GetAddressOfBaseClass - This function will add the necessary delta to the + /// load of 'this' and returns address of the base class. + llvm::Value *GetAddressOfBaseClass(llvm::Value *Value, + const CXXRecordDecl *Derived, + const CXXBaseSpecifierArray &BasePath, + bool NullCheckValue); + + llvm::Value *GetAddressOfDerivedClass(llvm::Value *Value, + const CXXRecordDecl *Derived, + const CXXBaseSpecifierArray &BasePath, + bool NullCheckValue); + + llvm::Value *GetVirtualBaseClassOffset(llvm::Value *This, + const CXXRecordDecl *ClassDecl, + const CXXRecordDecl *BaseClassDecl); + + void EmitDelegateCXXConstructorCall(const CXXConstructorDecl *Ctor, + CXXCtorType CtorType, + const FunctionArgList &Args); + void EmitCXXConstructorCall(const CXXConstructorDecl *D, CXXCtorType Type, + bool ForVirtualBase, llvm::Value *This, + CallExpr::const_arg_iterator ArgBeg, + CallExpr::const_arg_iterator ArgEnd); + + void EmitCXXAggrConstructorCall(const CXXConstructorDecl *D, + const ConstantArrayType *ArrayTy, + llvm::Value *ArrayPtr, + CallExpr::const_arg_iterator ArgBeg, + CallExpr::const_arg_iterator ArgEnd); + + void EmitCXXAggrConstructorCall(const CXXConstructorDecl *D, + llvm::Value *NumElements, + llvm::Value *ArrayPtr, + CallExpr::const_arg_iterator ArgBeg, + CallExpr::const_arg_iterator ArgEnd); + + void EmitCXXAggrDestructorCall(const CXXDestructorDecl *D, + const ArrayType *Array, + llvm::Value *This); + + void EmitCXXAggrDestructorCall(const CXXDestructorDecl *D, + llvm::Value *NumElements, + llvm::Value *This); + + llvm::Function *GenerateCXXAggrDestructorHelper(const CXXDestructorDecl *D, + const ArrayType *Array, + llvm::Value *This); + + void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type, + bool ForVirtualBase, llvm::Value *This); + + void EmitNewArrayInitializer(const CXXNewExpr *E, llvm::Value *NewPtr, + llvm::Value *NumElements); + + void EmitCXXTemporary(const CXXTemporary *Temporary, llvm::Value *Ptr); + + llvm::Value *EmitCXXNewExpr(const CXXNewExpr *E); + void EmitCXXDeleteExpr(const CXXDeleteExpr *E); + + void EmitDeleteCall(const FunctionDecl *DeleteFD, llvm::Value *Ptr, + QualType DeleteTy); + + llvm::Value* EmitCXXTypeidExpr(const CXXTypeidExpr *E); + llvm::Value *EmitDynamicCast(llvm::Value *V, const CXXDynamicCastExpr *DCE); + + void EmitCheck(llvm::Value *, unsigned Size); + + llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV, + bool isInc, bool isPre); + ComplexPairTy EmitComplexPrePostIncDec(const UnaryOperator *E, LValue LV, + bool isInc, bool isPre); + //===--------------------------------------------------------------------===// + // Declaration Emission + //===--------------------------------------------------------------------===// + + /// EmitDecl - Emit a declaration. + /// + /// This function can be called with a null (unreachable) insert point. + void EmitDecl(const Decl &D); + + /// EmitBlockVarDecl - Emit a block variable declaration. + /// + /// This function can be called with a null (unreachable) insert point. + void EmitBlockVarDecl(const VarDecl &D); + + typedef void SpecialInitFn(CodeGenFunction &Init, const VarDecl &D, + llvm::Value *Address); + + /// EmitLocalBlockVarDecl - Emit a local block variable declaration. + /// + /// This function can be called with a null (unreachable) insert point. + void EmitLocalBlockVarDecl(const VarDecl &D, SpecialInitFn *SpecialInit = 0); + + void EmitStaticBlockVarDecl(const VarDecl &D, + llvm::GlobalValue::LinkageTypes Linkage); + + /// EmitParmDecl - Emit a ParmVarDecl or an ImplicitParamDecl. + void EmitParmDecl(const VarDecl &D, llvm::Value *Arg); + + //===--------------------------------------------------------------------===// + // Statement Emission + //===--------------------------------------------------------------------===// + + /// EmitStopPoint - Emit a debug stoppoint if we are emitting debug info. + void EmitStopPoint(const Stmt *S); + + /// EmitStmt - Emit the code for the statement \arg S. It is legal to call + /// this function even if there is no current insertion point. + /// + /// This function may clear the current insertion point; callers should use + /// EnsureInsertPoint if they wish to subsequently generate code without first + /// calling EmitBlock, EmitBranch, or EmitStmt. + void EmitStmt(const Stmt *S); + + /// EmitSimpleStmt - Try to emit a "simple" statement which does not + /// necessarily require an insertion point or debug information; typically + /// because the statement amounts to a jump or a container of other + /// statements. + /// + /// \return True if the statement was handled. + bool EmitSimpleStmt(const Stmt *S); + + RValue EmitCompoundStmt(const CompoundStmt &S, bool GetLast = false, + llvm::Value *AggLoc = 0, bool isAggVol = false); + + /// EmitLabel - Emit the block for the given label. It is legal to call this + /// function even if there is no current insertion point. + void EmitLabel(const LabelStmt &S); // helper for EmitLabelStmt. + + void EmitLabelStmt(const LabelStmt &S); + void EmitGotoStmt(const GotoStmt &S); + void EmitIndirectGotoStmt(const IndirectGotoStmt &S); + void EmitIfStmt(const IfStmt &S); + void EmitWhileStmt(const WhileStmt &S); + void EmitDoStmt(const DoStmt &S); + void EmitForStmt(const ForStmt &S); + void EmitReturnStmt(const ReturnStmt &S); + void EmitDeclStmt(const DeclStmt &S); + void EmitBreakStmt(const BreakStmt &S); + void EmitContinueStmt(const ContinueStmt &S); + void EmitSwitchStmt(const SwitchStmt &S); + void EmitDefaultStmt(const DefaultStmt &S); + void EmitCaseStmt(const CaseStmt &S); + void EmitCaseStmtRange(const CaseStmt &S); + void EmitAsmStmt(const AsmStmt &S); + + void EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S); + void EmitObjCAtTryStmt(const ObjCAtTryStmt &S); + void EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S); + void EmitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt &S); + + llvm::Constant *getUnwindResumeOrRethrowFn(); + void EnterCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock = false); + void ExitCXXTryStmt(const CXXTryStmt &S, bool IsFnTryBlock = false); + + void EmitCXXTryStmt(const CXXTryStmt &S); + + //===--------------------------------------------------------------------===// + // LValue Expression Emission + //===--------------------------------------------------------------------===// + + /// GetUndefRValue - Get an appropriate 'undef' rvalue for the given type. + RValue GetUndefRValue(QualType Ty); + + /// EmitUnsupportedRValue - Emit a dummy r-value using the type of E + /// and issue an ErrorUnsupported style diagnostic (using the + /// provided Name). + RValue EmitUnsupportedRValue(const Expr *E, + const char *Name); + + /// EmitUnsupportedLValue - Emit a dummy l-value using the type of E and issue + /// an ErrorUnsupported style diagnostic (using the provided Name). + LValue EmitUnsupportedLValue(const Expr *E, + const char *Name); + + /// EmitLValue - Emit code to compute a designator that specifies the location + /// of the expression. + /// + /// This can return one of two things: a simple address or a bitfield + /// reference. In either case, the LLVM Value* in the LValue structure is + /// guaranteed to be an LLVM pointer type. + /// + /// If this returns a bitfield reference, nothing about the pointee type of + /// the LLVM value is known: For example, it may not be a pointer to an + /// integer. + /// + /// If this returns a normal address, and if the lvalue's C type is fixed + /// size, this method guarantees that the returned pointer type will point to + /// an LLVM type of the same size of the lvalue's type. If the lvalue has a + /// variable length type, this is not possible. + /// + LValue EmitLValue(const Expr *E); + + /// EmitCheckedLValue - Same as EmitLValue but additionally we generate + /// checking code to guard against undefined behavior. This is only + /// suitable when we know that the address will be used to access the + /// object. + LValue EmitCheckedLValue(const Expr *E); + + /// EmitLoadOfScalar - Load a scalar value from an address, taking + /// care to appropriately convert from the memory representation to + /// the LLVM value representation. + llvm::Value *EmitLoadOfScalar(llvm::Value *Addr, bool Volatile, + QualType Ty); + + /// EmitStoreOfScalar - Store a scalar value to an address, taking + /// care to appropriately convert from the memory representation to + /// the LLVM value representation. + void EmitStoreOfScalar(llvm::Value *Value, llvm::Value *Addr, + bool Volatile, QualType Ty); + + /// EmitLoadOfLValue - Given an expression that represents a value lvalue, + /// this method emits the address of the lvalue, then loads the result as an + /// rvalue, returning the rvalue. + RValue EmitLoadOfLValue(LValue V, QualType LVType); + RValue EmitLoadOfExtVectorElementLValue(LValue V, QualType LVType); + RValue EmitLoadOfBitfieldLValue(LValue LV, QualType ExprType); + RValue EmitLoadOfPropertyRefLValue(LValue LV, QualType ExprType); + RValue EmitLoadOfKVCRefLValue(LValue LV, QualType ExprType); + + + /// EmitStoreThroughLValue - Store the specified rvalue into the specified + /// lvalue, where both are guaranteed to the have the same type, and that type + /// is 'Ty'. + void EmitStoreThroughLValue(RValue Src, LValue Dst, QualType Ty); + void EmitStoreThroughExtVectorComponentLValue(RValue Src, LValue Dst, + QualType Ty); + void EmitStoreThroughPropertyRefLValue(RValue Src, LValue Dst, QualType Ty); + void EmitStoreThroughKVCRefLValue(RValue Src, LValue Dst, QualType Ty); + + /// EmitStoreThroughLValue - Store Src into Dst with same constraints as + /// EmitStoreThroughLValue. + /// + /// \param Result [out] - If non-null, this will be set to a Value* for the + /// bit-field contents after the store, appropriate for use as the result of + /// an assignment to the bit-field. + void EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst, QualType Ty, + llvm::Value **Result=0); + + // Note: only availabe for agg return types + LValue EmitBinaryOperatorLValue(const BinaryOperator *E); + LValue EmitCompoundAssignOperatorLValue(const CompoundAssignOperator *E); + // Note: only available for agg return types + LValue EmitCallExprLValue(const CallExpr *E); + // Note: only available for agg return types + LValue EmitVAArgExprLValue(const VAArgExpr *E); + LValue EmitDeclRefLValue(const DeclRefExpr *E); + LValue EmitStringLiteralLValue(const StringLiteral *E); + LValue EmitObjCEncodeExprLValue(const ObjCEncodeExpr *E); + LValue EmitPredefinedFunctionName(unsigned Type); + LValue EmitPredefinedLValue(const PredefinedExpr *E); + LValue EmitUnaryOpLValue(const UnaryOperator *E); + LValue EmitArraySubscriptExpr(const ArraySubscriptExpr *E); + LValue EmitExtVectorElementExpr(const ExtVectorElementExpr *E); + LValue EmitMemberExpr(const MemberExpr *E); + LValue EmitObjCIsaExpr(const ObjCIsaExpr *E); + LValue EmitCompoundLiteralLValue(const CompoundLiteralExpr *E); + LValue EmitConditionalOperatorLValue(const ConditionalOperator *E); + LValue EmitCastLValue(const CastExpr *E); + LValue EmitNullInitializationLValue(const CXXScalarValueInitExpr *E); + + llvm::Value *EmitIvarOffset(const ObjCInterfaceDecl *Interface, + const ObjCIvarDecl *Ivar); + LValue EmitLValueForAnonRecordField(llvm::Value* Base, + const FieldDecl* Field, + unsigned CVRQualifiers); + LValue EmitLValueForField(llvm::Value* Base, const FieldDecl* Field, + unsigned CVRQualifiers); + + /// EmitLValueForFieldInitialization - Like EmitLValueForField, except that + /// if the Field is a reference, this will return the address of the reference + /// and not the address of the value stored in the reference. + LValue EmitLValueForFieldInitialization(llvm::Value* Base, + const FieldDecl* Field, + unsigned CVRQualifiers); + + LValue EmitLValueForIvar(QualType ObjectTy, + llvm::Value* Base, const ObjCIvarDecl *Ivar, + unsigned CVRQualifiers); + + LValue EmitLValueForBitfield(llvm::Value* Base, const FieldDecl* Field, + unsigned CVRQualifiers); + + LValue EmitBlockDeclRefLValue(const BlockDeclRefExpr *E); + + LValue EmitCXXConstructLValue(const CXXConstructExpr *E); + LValue EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E); + LValue EmitCXXExprWithTemporariesLValue(const CXXExprWithTemporaries *E); + LValue EmitCXXTypeidLValue(const CXXTypeidExpr *E); + + LValue EmitObjCMessageExprLValue(const ObjCMessageExpr *E); + LValue EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E); + LValue EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E); + LValue EmitObjCKVCRefLValue(const ObjCImplicitSetterGetterRefExpr *E); + LValue EmitObjCSuperExprLValue(const ObjCSuperExpr *E); + LValue EmitStmtExprLValue(const StmtExpr *E); + LValue EmitPointerToDataMemberBinaryExpr(const BinaryOperator *E); + LValue EmitObjCSelectorLValue(const ObjCSelectorExpr *E); + + //===--------------------------------------------------------------------===// + // Scalar Expression Emission + //===--------------------------------------------------------------------===// + + /// EmitCall - Generate a call of the given function, expecting the given + /// result type, and using the given argument list which specifies both the + /// LLVM arguments and the types they were derived from. + /// + /// \param TargetDecl - If given, the decl of the function in a direct call; + /// used to set attributes on the call (noreturn, etc.). + RValue EmitCall(const CGFunctionInfo &FnInfo, + llvm::Value *Callee, + ReturnValueSlot ReturnValue, + const CallArgList &Args, + const Decl *TargetDecl = 0, + llvm::Instruction **callOrInvoke = 0); + + RValue EmitCall(QualType FnType, llvm::Value *Callee, + ReturnValueSlot ReturnValue, + CallExpr::const_arg_iterator ArgBeg, + CallExpr::const_arg_iterator ArgEnd, + const Decl *TargetDecl = 0); + RValue EmitCallExpr(const CallExpr *E, + ReturnValueSlot ReturnValue = ReturnValueSlot()); + + llvm::CallSite EmitCallOrInvoke(llvm::Value *Callee, + llvm::Value * const *ArgBegin, + llvm::Value * const *ArgEnd, + const llvm::Twine &Name = ""); + + llvm::Value *BuildVirtualCall(const CXXMethodDecl *MD, llvm::Value *This, + const llvm::Type *Ty); + llvm::Value *BuildVirtualCall(const CXXDestructorDecl *DD, CXXDtorType Type, + llvm::Value *&This, const llvm::Type *Ty); + + RValue EmitCXXMemberCall(const CXXMethodDecl *MD, + llvm::Value *Callee, + ReturnValueSlot ReturnValue, + llvm::Value *This, + llvm::Value *VTT, + CallExpr::const_arg_iterator ArgBeg, + CallExpr::const_arg_iterator ArgEnd); + RValue EmitCXXMemberCallExpr(const CXXMemberCallExpr *E, + ReturnValueSlot ReturnValue); + RValue EmitCXXMemberPointerCallExpr(const CXXMemberCallExpr *E, + ReturnValueSlot ReturnValue); + + RValue EmitCXXOperatorMemberCallExpr(const CXXOperatorCallExpr *E, + const CXXMethodDecl *MD, + ReturnValueSlot ReturnValue); + + + RValue EmitBuiltinExpr(const FunctionDecl *FD, + unsigned BuiltinID, const CallExpr *E); + + RValue EmitBlockCallExpr(const CallExpr *E, ReturnValueSlot ReturnValue); + + /// EmitTargetBuiltinExpr - Emit the given builtin call. Returns 0 if the call + /// is unhandled by the current target. + llvm::Value *EmitTargetBuiltinExpr(unsigned BuiltinID, const CallExpr *E); + + llvm::Value *EmitARMBuiltinExpr(unsigned BuiltinID, const CallExpr *E); + llvm::Value *EmitNeonCall(llvm::Function *F, + llvm::SmallVectorImpl<llvm::Value*> &O, + const char *name, bool splat = false, + unsigned shift = 0, bool rightshift = false); + llvm::Value *EmitNeonSplat(llvm::Value *V, llvm::Constant *Idx); + llvm::Value *EmitNeonShiftVector(llvm::Value *V, const llvm::Type *Ty, + bool negateForRightShift); + + llvm::Value *EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E); + llvm::Value *EmitPPCBuiltinExpr(unsigned BuiltinID, const CallExpr *E); + + llvm::Value *EmitObjCProtocolExpr(const ObjCProtocolExpr *E); + llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E); + llvm::Value *EmitObjCSelectorExpr(const ObjCSelectorExpr *E); + RValue EmitObjCMessageExpr(const ObjCMessageExpr *E, + ReturnValueSlot Return = ReturnValueSlot()); + RValue EmitObjCPropertyGet(const Expr *E, + ReturnValueSlot Return = ReturnValueSlot()); + RValue EmitObjCSuperPropertyGet(const Expr *Exp, const Selector &S, + ReturnValueSlot Return = ReturnValueSlot()); + void EmitObjCPropertySet(const Expr *E, RValue Src); + void EmitObjCSuperPropertySet(const Expr *E, const Selector &S, RValue Src); + + + /// EmitReferenceBindingToExpr - Emits a reference binding to the passed in + /// expression. Will emit a temporary variable if E is not an LValue. + RValue EmitReferenceBindingToExpr(const Expr* E, + const NamedDecl *InitializedDecl); + + //===--------------------------------------------------------------------===// + // Expression Emission + //===--------------------------------------------------------------------===// + + // Expressions are broken into three classes: scalar, complex, aggregate. + + /// EmitScalarExpr - Emit the computation of the specified expression of LLVM + /// scalar type, returning the result. + llvm::Value *EmitScalarExpr(const Expr *E , bool IgnoreResultAssign = false); + + /// EmitScalarConversion - Emit a conversion from the specified type to the + /// specified destination type, both of which are LLVM scalar types. + llvm::Value *EmitScalarConversion(llvm::Value *Src, QualType SrcTy, + QualType DstTy); + + /// EmitComplexToScalarConversion - Emit a conversion from the specified + /// complex type to the specified destination type, where the destination type + /// is an LLVM scalar type. + llvm::Value *EmitComplexToScalarConversion(ComplexPairTy Src, QualType SrcTy, + QualType DstTy); + + + /// EmitAggExpr - Emit the computation of the specified expression of + /// aggregate type. The result is computed into DestPtr. Note that if + /// DestPtr is null, the value of the aggregate expression is not needed. + void EmitAggExpr(const Expr *E, llvm::Value *DestPtr, bool VolatileDest, + bool IgnoreResult = false, bool IsInitializer = false, + bool RequiresGCollection = false); + + /// EmitAggExprToLValue - Emit the computation of the specified expression of + /// aggregate type into a temporary LValue. + LValue EmitAggExprToLValue(const Expr *E); + + /// EmitGCMemmoveCollectable - Emit special API for structs with object + /// pointers. + void EmitGCMemmoveCollectable(llvm::Value *DestPtr, llvm::Value *SrcPtr, + QualType Ty); + + /// EmitComplexExpr - Emit the computation of the specified expression of + /// complex type, returning the result. + ComplexPairTy EmitComplexExpr(const Expr *E, bool IgnoreReal = false, + bool IgnoreImag = false, + bool IgnoreRealAssign = false, + bool IgnoreImagAssign = false); + + /// EmitComplexExprIntoAddr - Emit the computation of the specified expression + /// of complex type, storing into the specified Value*. + void EmitComplexExprIntoAddr(const Expr *E, llvm::Value *DestAddr, + bool DestIsVolatile); + + /// StoreComplexToAddr - Store a complex number into the specified address. + void StoreComplexToAddr(ComplexPairTy V, llvm::Value *DestAddr, + bool DestIsVolatile); + /// LoadComplexFromAddr - Load a complex number from the specified address. + ComplexPairTy LoadComplexFromAddr(llvm::Value *SrcAddr, bool SrcIsVolatile); + + /// CreateStaticBlockVarDecl - Create a zero-initialized LLVM global for a + /// static block var decl. + llvm::GlobalVariable *CreateStaticBlockVarDecl(const VarDecl &D, + const char *Separator, + llvm::GlobalValue::LinkageTypes Linkage); + + /// AddInitializerToGlobalBlockVarDecl - Add the initializer for 'D' to the + /// global variable that has already been created for it. If the initializer + /// has a different type than GV does, this may free GV and return a different + /// one. Otherwise it just returns GV. + llvm::GlobalVariable * + AddInitializerToGlobalBlockVarDecl(const VarDecl &D, + llvm::GlobalVariable *GV); + + + /// EmitStaticCXXBlockVarDeclInit - Create the initializer for a C++ runtime + /// initialized static block var decl. + void EmitStaticCXXBlockVarDeclInit(const VarDecl &D, + llvm::GlobalVariable *GV); + + /// EmitCXXGlobalVarDeclInit - Create the initializer for a C++ + /// variable with global storage. + void EmitCXXGlobalVarDeclInit(const VarDecl &D, llvm::Constant *DeclPtr); + + /// EmitCXXGlobalDtorRegistration - Emits a call to register the global ptr + /// with the C++ runtime so that its destructor will be called at exit. + void EmitCXXGlobalDtorRegistration(llvm::Constant *DtorFn, + llvm::Constant *DeclPtr); + + /// GenerateCXXGlobalInitFunc - Generates code for initializing global + /// variables. + void GenerateCXXGlobalInitFunc(llvm::Function *Fn, + llvm::Constant **Decls, + unsigned NumDecls); + + /// GenerateCXXGlobalDtorFunc - Generates code for destroying global + /// variables. + void GenerateCXXGlobalDtorFunc(llvm::Function *Fn, + const std::vector<std::pair<llvm::WeakVH, + llvm::Constant*> > &DtorsAndObjects); + + void GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn, const VarDecl *D); + + void EmitCXXConstructExpr(llvm::Value *Dest, const CXXConstructExpr *E); + + RValue EmitCXXExprWithTemporaries(const CXXExprWithTemporaries *E, + llvm::Value *AggLoc = 0, + bool IsAggLocVolatile = false, + bool IsInitializer = false); + + void EmitCXXThrowExpr(const CXXThrowExpr *E); + + //===--------------------------------------------------------------------===// + // Internal Helpers + //===--------------------------------------------------------------------===// + + /// ContainsLabel - Return true if the statement contains a label in it. If + /// this statement is not executed normally, it not containing a label means + /// that we can just remove the code. + static bool ContainsLabel(const Stmt *S, bool IgnoreCaseStmts = false); + + /// ConstantFoldsToSimpleInteger - If the specified expression does not fold + /// to a constant, or if it does but contains a label, return 0. If it + /// constant folds to 'true' and does not contain a label, return 1, if it + /// constant folds to 'false' and does not contain a label, return -1. + int ConstantFoldsToSimpleInteger(const Expr *Cond); + + /// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an + /// if statement) to the specified blocks. Based on the condition, this might + /// try to simplify the codegen of the conditional based on the branch. + void EmitBranchOnBoolExpr(const Expr *Cond, llvm::BasicBlock *TrueBlock, + llvm::BasicBlock *FalseBlock); + + /// getTrapBB - Create a basic block that will call the trap intrinsic. We'll + /// generate a branch around the created basic block as necessary. + llvm::BasicBlock* getTrapBB(); + + /// EmitCallArg - Emit a single call argument. + RValue EmitCallArg(const Expr *E, QualType ArgType); + + /// EmitDelegateCallArg - We are performing a delegate call; that + /// is, the current function is delegating to another one. Produce + /// a r-value suitable for passing the given parameter. + RValue EmitDelegateCallArg(const VarDecl *Param); + +private: + void EmitReturnOfRValue(RValue RV, QualType Ty); + + /// ExpandTypeFromArgs - Reconstruct a structure of type \arg Ty + /// from function arguments into \arg Dst. See ABIArgInfo::Expand. + /// + /// \param AI - The first function argument of the expansion. + /// \return The argument following the last expanded function + /// argument. + llvm::Function::arg_iterator + ExpandTypeFromArgs(QualType Ty, LValue Dst, + llvm::Function::arg_iterator AI); + + /// ExpandTypeToArgs - Expand an RValue \arg Src, with the LLVM type for \arg + /// Ty, into individual arguments on the provided vector \arg Args. See + /// ABIArgInfo::Expand. + void ExpandTypeToArgs(QualType Ty, RValue Src, + llvm::SmallVector<llvm::Value*, 16> &Args); + + llvm::Value* EmitAsmInput(const AsmStmt &S, + const TargetInfo::ConstraintInfo &Info, + const Expr *InputExpr, std::string &ConstraintStr); + + /// EmitCallArgs - Emit call arguments for a function. + /// The CallArgTypeInfo parameter is used for iterating over the known + /// argument types of the function being called. + template<typename T> + void EmitCallArgs(CallArgList& Args, const T* CallArgTypeInfo, + CallExpr::const_arg_iterator ArgBeg, + CallExpr::const_arg_iterator ArgEnd) { + CallExpr::const_arg_iterator Arg = ArgBeg; + + // First, use the argument types that the type info knows about + if (CallArgTypeInfo) { + for (typename T::arg_type_iterator I = CallArgTypeInfo->arg_type_begin(), + E = CallArgTypeInfo->arg_type_end(); I != E; ++I, ++Arg) { + assert(Arg != ArgEnd && "Running over edge of argument list!"); + QualType ArgType = *I; + + assert(getContext().getCanonicalType(ArgType.getNonReferenceType()). + getTypePtr() == + getContext().getCanonicalType(Arg->getType()).getTypePtr() && + "type mismatch in call argument!"); + + Args.push_back(std::make_pair(EmitCallArg(*Arg, ArgType), + ArgType)); + } + + // Either we've emitted all the call args, or we have a call to a + // variadic function. + assert((Arg == ArgEnd || CallArgTypeInfo->isVariadic()) && + "Extra arguments in non-variadic function!"); + + } + + // If we still have any arguments, emit them using the type of the argument. + for (; Arg != ArgEnd; ++Arg) { + QualType ArgType = Arg->getType(); + Args.push_back(std::make_pair(EmitCallArg(*Arg, ArgType), + ArgType)); + } + } + + const TargetCodeGenInfo &getTargetHooks() const { + return CGM.getTargetCodeGenInfo(); + } + + void EmitDeclMetadata(); +}; + + +} // end namespace CodeGen +} // end namespace clang + +#endif |
