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Diffstat (limited to 'lib/CodeGen/CodeGenFunction.h')
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diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h new file mode 100644 index 0000000..b7894a4 --- /dev/null +++ b/lib/CodeGen/CodeGenFunction.h @@ -0,0 +1,900 @@ +//===-- 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/Basic/TargetInfo.h" +#include "llvm/ADT/DenseMap.h" +#include "llvm/ADT/SmallVector.h" +#include "llvm/Support/ValueHandle.h" +#include <map> +#include "CGBlocks.h" +#include "CGBuilder.h" +#include "CGCall.h" +#include "CGCXX.h" +#include "CGValue.h" + +namespace llvm { + class BasicBlock; + class Module; + class SwitchInst; + class Value; +} + +namespace clang { + class ASTContext; + class CXXDestructorDecl; + 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 VarDecl; + class ObjCForCollectionStmt; + class ObjCAtTryStmt; + class ObjCAtThrowStmt; + class ObjCAtSynchronizedStmt; + +namespace CodeGen { + class CodeGenModule; + class CodeGenTypes; + class CGDebugInfo; + class CGFunctionInfo; + class CGRecordLayout; + +/// 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: + CodeGenModule &CGM; // Per-module state. + 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; + + /// ReturnBlock - Unified return block. + llvm::BasicBlock *ReturnBlock; + /// ReturnValue - The temporary alloca to hold the return value. This is null + /// iff the function has no return value. + llvm::Instruction *ReturnValue; + + /// AllocaInsertPoint - This is an instruction in the entry block before which + /// we prefer to insert allocas. + llvm::AssertingVH<llvm::Instruction> AllocaInsertPt; + + const llvm::Type *LLVMIntTy; + uint32_t LLVMPointerWidth; + +public: + /// ObjCEHValueStack - Stack of Objective-C exception values, used for + /// rethrows. + llvm::SmallVector<llvm::Value*, 8> ObjCEHValueStack; + + /// PushCleanupBlock - Push a new cleanup entry on the stack and set the + /// passed in block as the cleanup block. + void PushCleanupBlock(llvm::BasicBlock *CleanupBlock); + + /// CleanupBlockInfo - A struct representing a popped cleanup block. + struct CleanupBlockInfo { + /// CleanupBlock - the cleanup block + llvm::BasicBlock *CleanupBlock; + + /// SwitchBlock - the block (if any) containing the switch instruction used + /// for jumping to the final destination. + llvm::BasicBlock *SwitchBlock; + + /// EndBlock - the default destination for the switch instruction. + llvm::BasicBlock *EndBlock; + + CleanupBlockInfo(llvm::BasicBlock *cb, llvm::BasicBlock *sb, + llvm::BasicBlock *eb) + : CleanupBlock(cb), SwitchBlock(sb), EndBlock(eb) {} + }; + + /// PopCleanupBlock - Will pop the cleanup entry on the stack, process all + /// branch fixups and return a block info struct with the switch block and end + /// block. + CleanupBlockInfo PopCleanupBlock(); + + /// CleanupScope - 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 CleanupScope { + CodeGenFunction& CGF; + llvm::BasicBlock *CurBB; + llvm::BasicBlock *CleanupBB; + + public: + CleanupScope(CodeGenFunction &cgf) + : CGF(cgf), CurBB(CGF.Builder.GetInsertBlock()) { + CleanupBB = CGF.createBasicBlock("cleanup"); + CGF.Builder.SetInsertPoint(CleanupBB); + } + + ~CleanupScope() { + CGF.PushCleanupBlock(CleanupBB); + CGF.Builder.SetInsertPoint(CurBB); + } + }; + + /// EmitCleanupBlocks - Takes the old cleanup stack size and emits the cleanup + /// blocks that have been added. + void EmitCleanupBlocks(size_t OldCleanupStackSize); + + /// EmitBranchThroughCleanup - Emit a branch from the current insert block + /// through the cleanup handling code (if any) and then on to \arg Dest. + /// + /// FIXME: Maybe this should really be in EmitBranch? Don't we always want + /// this behavior for branches? + void EmitBranchThroughCleanup(llvm::BasicBlock *Dest); + +private: + CGDebugInfo* DebugInfo; + + /// LabelIDs - Track arbitrary ids assigned to labels for use in implementing + /// the GCC address-of-label extension and indirect goto. IDs are assigned to + /// labels inside getIDForAddrOfLabel(). + std::map<const LabelStmt*, unsigned> LabelIDs; + + /// IndirectSwitches - Record the list of switches for indirect + /// gotos. Emission of the actual switching code needs to be delayed until all + /// AddrLabelExprs have been seen. + std::vector<llvm::SwitchInst*> IndirectSwitches; + + /// 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*, llvm::BasicBlock*> LabelMap; + + // BreakContinueStack - This keeps track of where break and continue + // statements should jump to. + struct BreakContinue { + BreakContinue(llvm::BasicBlock *bb, llvm::BasicBlock *cb) + : BreakBlock(bb), ContinueBlock(cb) {} + + llvm::BasicBlock *BreakBlock; + llvm::BasicBlock *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. + // FIXME: Maybe this could be a stack of maps that is pushed/popped as we + // enter/leave scopes. + llvm::DenseMap<const VariableArrayType*, 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; + + struct CleanupEntry { + /// CleanupBlock - The block of code that does the actual cleanup. + llvm::BasicBlock *CleanupBlock; + + /// Blocks - Basic blocks that were emitted in the current cleanup scope. + std::vector<llvm::BasicBlock *> Blocks; + + /// BranchFixups - Branch instructions to basic blocks that haven't been + /// inserted into the current function yet. + std::vector<llvm::BranchInst *> BranchFixups; + + explicit CleanupEntry(llvm::BasicBlock *cb) + : CleanupBlock(cb) {} + }; + + /// CleanupEntries - Stack of cleanup entries. + llvm::SmallVector<CleanupEntry, 8> CleanupEntries; + + typedef llvm::DenseMap<llvm::BasicBlock*, size_t> BlockScopeMap; + + /// BlockScopes - Map of which "cleanup scope" scope basic blocks have. + BlockScopeMap BlockScopes; + + /// CXXThisDecl - When parsing an C++ function, this will hold the implicit + /// 'this' declaration. + ImplicitParamDecl *CXXThisDecl; + + llvm::SmallVector<const CXXTemporary*, 4> LiveTemporaries; + +public: + CodeGenFunction(CodeGenModule &cgm); + + ASTContext &getContext() const; + CGDebugInfo *getDebugInfo() { return DebugInfo; } + + llvm::BasicBlock *getInvokeDest() { return InvokeDest; } + void setInvokeDest(llvm::BasicBlock *B) { InvokeDest = B; } + + //===--------------------------------------------------------------------===// + // 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); + + /// GenerateObjCSetter - Synthesize an Objective-C property setter function + /// for the given property. + void GenerateObjCSetter(ObjCImplementationDecl *IMP, + const ObjCPropertyImplDecl *PID); + + //===--------------------------------------------------------------------===// + // Block Bits + //===--------------------------------------------------------------------===// + + llvm::Value *BuildBlockLiteralTmp(const BlockExpr *); + llvm::Constant *BuildDescriptorBlockDecl(bool BlockHasCopyDispose, + uint64_t Size, + const llvm::StructType *, + std::vector<HelperInfo> *); + + llvm::Function *GenerateBlockFunction(const BlockExpr *BExpr, + const BlockInfo& Info, + const Decl *OuterFuncDecl, + llvm::DenseMap<const Decl*, llvm::Value*> ldm, + uint64_t &Size, uint64_t &Align, + llvm::SmallVector<const Expr *, 8> &subBlockDeclRefDecls, + bool &subBlockHasCopyDispose); + + void BlockForwardSelf(); + llvm::Value *LoadBlockStruct(); + + llvm::Value *GetAddrOfBlockDecl(const BlockDeclRefExpr *E); + + const llvm::Type *BuildByRefType(QualType Ty, uint64_t Align); + + void GenerateCode(const FunctionDecl *FD, + llvm::Function *Fn); + void StartFunction(const Decl *D, QualType RetTy, + llvm::Function *Fn, + const FunctionArgList &Args, + SourceLocation StartLoc); + + /// 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()); + + /// 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, llvm::Value *ReturnValue); + + const llvm::Type *ConvertTypeForMem(QualType T); + const llvm::Type *ConvertType(QualType 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("", Parent, InsertBefore); +#else + return llvm::BasicBlock::Create(Name, Parent, InsertBefore); +#endif + } + + /// getBasicBlockForLabel - Return the LLVM basicblock that the specified + /// label maps to. + llvm::BasicBlock *getBasicBlockForLabel(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 + //===--------------------------------------------------------------------===// + + /// CreateTempAlloca - This creates a alloca and inserts it into the entry + /// block. + llvm::AllocaInst *CreateTempAlloca(const llvm::Type *Ty, + const char *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); + + // 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, llvm::Value *AggLoc = 0, + bool isAggLocVolatile = 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); + + void EmitAggregateClear(llvm::Value *DestPtr, QualType Ty); + + /// StartBlock - Start new block named N. If insert block is a dummy block + /// then reuse it. + void StartBlock(const char *N); + + /// getCGRecordLayout - Return record layout info. + const CGRecordLayout *getCGRecordLayout(CodeGenTypes &CGT, QualType RTy); + + /// 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); + + unsigned GetIDForAddrOfLabel(const LabelStmt *L); + + /// EmitMemSetToZero - Generate code to memset a value of the given type to 0. + void EmitMemSetToZero(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. + 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(); + + void EmitCXXConstructorCall(const CXXConstructorDecl *D, CXXCtorType Type, + llvm::Value *This, + CallExpr::const_arg_iterator ArgBeg, + CallExpr::const_arg_iterator ArgEnd); + + void EmitCXXDestructorCall(const CXXDestructorDecl *D, CXXDtorType Type, + llvm::Value *This); + + void PushCXXTemporary(const CXXTemporary *Temporary, llvm::Value *Ptr); + + llvm::Value *EmitCXXNewExpr(const CXXNewExpr *E); + + //===--------------------------------------------------------------------===// + // Declaration Emission + //===--------------------------------------------------------------------===// + + void EmitDecl(const Decl &D); + void EmitBlockVarDecl(const VarDecl &D); + void EmitLocalBlockVarDecl(const VarDecl &D); + void EmitStaticBlockVarDecl(const VarDecl &D); + + /// 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); + + //===--------------------------------------------------------------------===// + // 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); + + /// 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); + // 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 EmitCompoundLiteralLValue(const CompoundLiteralExpr *E); + LValue EmitConditionalOperator(const ConditionalOperator *E); + LValue EmitCastLValue(const CastExpr *E); + + llvm::Value *EmitIvarOffset(const ObjCInterfaceDecl *Interface, + const ObjCIvarDecl *Ivar); + LValue EmitLValueForField(llvm::Value* Base, FieldDecl* Field, + bool isUnion, unsigned CVRQualifiers); + LValue EmitLValueForIvar(QualType ObjectTy, + llvm::Value* Base, const ObjCIvarDecl *Ivar, + unsigned CVRQualifiers); + + LValue EmitLValueForBitfield(llvm::Value* Base, FieldDecl* Field, + unsigned CVRQualifiers); + + LValue EmitBlockDeclRefLValue(const BlockDeclRefExpr *E); + + LValue EmitCXXConditionDeclLValue(const CXXConditionDeclExpr *E); + LValue EmitCXXConstructLValue(const CXXConstructExpr *E); + LValue EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E); + + LValue EmitObjCMessageExprLValue(const ObjCMessageExpr *E); + LValue EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E); + LValue EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E); + LValue EmitObjCKVCRefLValue(const ObjCKVCRefExpr *E); + LValue EmitObjCSuperExprLValue(const ObjCSuperExpr *E); + LValue EmitStmtExprLValue(const StmtExpr *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, + const CallArgList &Args, + const Decl *TargetDecl = 0); + + RValue EmitCall(llvm::Value *Callee, QualType FnType, + CallExpr::const_arg_iterator ArgBeg, + CallExpr::const_arg_iterator ArgEnd, + const Decl *TargetDecl = 0); + RValue EmitCallExpr(const CallExpr *E); + + RValue EmitCXXMemberCall(const CXXMethodDecl *MD, + llvm::Value *Callee, + llvm::Value *This, + CallExpr::const_arg_iterator ArgBeg, + CallExpr::const_arg_iterator ArgEnd); + RValue EmitCXXMemberCallExpr(const CXXMemberCallExpr *E); + + RValue EmitCXXOperatorMemberCallExpr(const CXXOperatorCallExpr *E, + const CXXMethodDecl *MD); + + RValue EmitBuiltinExpr(const FunctionDecl *FD, + unsigned BuiltinID, const CallExpr *E); + + RValue EmitBlockCallExpr(const CallExpr *E); + + /// 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 *EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E); + llvm::Value *EmitPPCBuiltinExpr(unsigned BuiltinID, const CallExpr *E); + + llvm::Value *EmitShuffleVector(llvm::Value* V1, llvm::Value *V2, ...); + llvm::Value *EmitVector(llvm::Value * const *Vals, unsigned NumVals, + bool isSplat = false); + + llvm::Value *EmitObjCProtocolExpr(const ObjCProtocolExpr *E); + llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E); + llvm::Value *EmitObjCSelectorExpr(const ObjCSelectorExpr *E); + RValue EmitObjCMessageExpr(const ObjCMessageExpr *E); + RValue EmitObjCPropertyGet(const Expr *E); + RValue EmitObjCSuperPropertyGet(const Expr *Exp, const Selector &S); + 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, QualType DestType); + + //===--------------------------------------------------------------------===// + // 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); + + /// 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); + + /// GenerateStaticCXXBlockVarDecl - Create the initializer for a C++ + /// runtime initialized static block var decl. + void GenerateStaticCXXBlockVarDeclInit(const VarDecl &D, + llvm::GlobalVariable *GV); + + void EmitCXXConstructExpr(llvm::Value *Dest, const CXXConstructExpr *E); + + RValue EmitCXXExprWithTemporaries(const CXXExprWithTemporaries *E, + llvm::Value *AggLoc = 0, + bool isAggLocVolatile = false); + + //===--------------------------------------------------------------------===// + // 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); +private: + + /// EmitIndirectSwitches - Emit code for all of the switch + /// instructions in IndirectSwitches. + void EmitIndirectSwitches(); + + 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); + + /// EmitCleanupBlock - emits a single cleanup block. + void EmitCleanupBlock(); + + /// AddBranchFixup - adds a branch instruction to the list of fixups for the + /// current cleanup scope. + void AddBranchFixup(llvm::BranchInst *BI); + + /// EmitCallArg - Emit a single call argument. + RValue EmitCallArg(const Expr *E, QualType ArgType); + + /// 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) { + 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)); + } + } +}; + + +} // end namespace CodeGen +} // end namespace clang + +#endif |
