forked from OSchip/llvm-project
446 lines
18 KiB
C++
446 lines
18 KiB
C++
//===-- CodeGenFunction.h - Per-Function state for LLVM CodeGen -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is the internal per-function state used for llvm translation.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_CODEGEN_CODEGENFUNCTION_H
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#define CLANG_CODEGEN_CODEGENFUNCTION_H
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#include "clang/AST/Type.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/IRBuilder.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/ExprObjC.h"
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#include <vector>
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#include <map>
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#include "CGCall.h"
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#include "CGValue.h"
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namespace llvm {
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class BasicBlock;
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class Module;
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}
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namespace clang {
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class ASTContext;
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class Decl;
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class EnumConstantDecl;
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class FunctionDecl;
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class FunctionTypeProto;
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class LabelStmt;
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class ObjCMethodDecl;
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class ObjCPropertyImplDecl;
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class TargetInfo;
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class VarDecl;
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namespace CodeGen {
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class CodeGenModule;
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class CodeGenTypes;
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class CGRecordLayout;
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/// CodeGenFunction - This class organizes the per-function state that is used
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/// while generating LLVM code.
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class CodeGenFunction {
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public:
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CodeGenModule &CGM; // Per-module state.
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TargetInfo &Target;
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typedef std::pair<llvm::Value *, llvm::Value *> ComplexPairTy;
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llvm::IRBuilder<> Builder;
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// Holds the Decl for the current function or method
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const Decl *CurFuncDecl;
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QualType FnRetTy;
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llvm::Function *CurFn;
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/// ReturnBlock - Unified return block.
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llvm::BasicBlock *ReturnBlock;
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/// ReturnValue - The temporary alloca to hold the return value. This
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/// is null iff the function has no return value.
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llvm::Instruction *ReturnValue;
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/// AllocaInsertPoint - This is an instruction in the entry block before which
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/// we prefer to insert allocas.
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llvm::Instruction *AllocaInsertPt;
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const llvm::Type *LLVMIntTy;
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uint32_t LLVMPointerWidth;
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private:
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/// LabelIDs - Track arbitrary ids assigned to labels for use in
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/// implementing the GCC address-of-label extension and indirect
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/// goto. IDs are assigned to labels inside getIDForAddrOfLabel().
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std::map<const LabelStmt*, unsigned> LabelIDs;
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/// IndirectSwitches - Record the list of switches for indirect
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/// gotos. Emission of the actual switching code needs to be delayed
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/// until all AddrLabelExprs have been seen.
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std::vector<llvm::SwitchInst*> IndirectSwitches;
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/// LocalDeclMap - This keeps track of the LLVM allocas or globals for local C
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/// decls.
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llvm::DenseMap<const Decl*, llvm::Value*> LocalDeclMap;
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/// LabelMap - This keeps track of the LLVM basic block for each C label.
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llvm::DenseMap<const LabelStmt*, llvm::BasicBlock*> LabelMap;
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// BreakContinueStack - This keeps track of where break and continue
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// statements should jump to.
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struct BreakContinue {
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BreakContinue(llvm::BasicBlock *bb, llvm::BasicBlock *cb)
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: BreakBlock(bb), ContinueBlock(cb) {}
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llvm::BasicBlock *BreakBlock;
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llvm::BasicBlock *ContinueBlock;
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};
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llvm::SmallVector<BreakContinue, 8> BreakContinueStack;
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/// SwitchInsn - This is nearest current switch instruction. It is null if
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/// if current context is not in a switch.
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llvm::SwitchInst *SwitchInsn;
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/// CaseRangeBlock - This block holds if condition check for last case
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/// statement range in current switch instruction.
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llvm::BasicBlock *CaseRangeBlock;
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public:
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CodeGenFunction(CodeGenModule &cgm);
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ASTContext &getContext() const;
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void GenerateObjCMethod(const ObjCMethodDecl *OMD);
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void StartObjCMethod(const ObjCMethodDecl *MD);
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/// GenerateObjCGetter - Synthesize an Objective-C property getter
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/// function.
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void GenerateObjCGetter(const ObjCPropertyImplDecl *PID);
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/// GenerateObjCSetter - Synthesize an Objective-C property setter
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/// function for the given property.
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void GenerateObjCSetter(const ObjCPropertyImplDecl *PID);
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void GenerateCode(const FunctionDecl *FD,
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llvm::Function *Fn);
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void StartFunction(const Decl *D, QualType RetTy,
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llvm::Function *Fn,
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const FunctionArgList &Args);
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void FinishFunction(SourceLocation EndLoc=SourceLocation());
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/// EmitFunctionProlog - Emit the target specific LLVM code to load
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/// the arguments for the given function. This is also responsible
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/// for naming the LLVM function arguments.
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void EmitFunctionProlog(llvm::Function *Fn, QualType RetTy,
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const FunctionArgList &Args);
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/// EmitFunctionEpilog - Emit the target specific LLVM code to
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/// return the given temporary.
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void EmitFunctionEpilog(QualType RetTy,
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llvm::Value *ReturnValue);
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const llvm::Type *ConvertType(QualType T);
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/// LoadObjCSelf - Load the value of self. This function is only
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/// valid while generating code for an Objective-C method.
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llvm::Value *LoadObjCSelf();
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/// isObjCPointerType - Return true if the specificed AST type will map onto
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/// some Objective-C pointer type.
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static bool isObjCPointerType(QualType T);
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/// hasAggregateLLVMType - Return true if the specified AST type will map into
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/// an aggregate LLVM type or is void.
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static bool hasAggregateLLVMType(QualType T);
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/// getBasicBlockForLabel - Return the LLVM basicblock that the specified
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/// label maps to.
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llvm::BasicBlock *getBasicBlockForLabel(const LabelStmt *S);
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void EmitBlock(llvm::BasicBlock *BB);
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/// ErrorUnsupported - Print out an error that codegen doesn't support the
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/// specified stmt yet.
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void ErrorUnsupported(const Stmt *S, const char *Type,
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bool OmitOnError=false);
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//===--------------------------------------------------------------------===//
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// Helpers
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//===--------------------------------------------------------------------===//
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/// CreateTempAlloca - This creates a alloca and inserts it into the entry
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/// block.
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llvm::AllocaInst *CreateTempAlloca(const llvm::Type *Ty,
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const char *Name = "tmp");
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/// EvaluateExprAsBool - Perform the usual unary conversions on the specified
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/// expression and compare the result against zero, returning an Int1Ty value.
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llvm::Value *EvaluateExprAsBool(const Expr *E);
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/// EmitAnyExpr - Emit code to compute the specified expression which can have
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/// any type. The result is returned as an RValue struct. If this is an
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/// aggregate expression, the aggloc/agglocvolatile arguments indicate where
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/// the result should be returned.
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RValue EmitAnyExpr(const Expr *E, llvm::Value *AggLoc = 0,
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bool isAggLocVolatile = false);
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/// EmitAnyExprToTemp - Similary to EmitAnyExpr(), however, the result
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/// will always be accessible even if no aggregate location is
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/// provided.
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RValue EmitAnyExprToTemp(const Expr *E, llvm::Value *AggLoc = 0,
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bool isAggLocVolatile = false);
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void EmitAggregateCopy(llvm::Value *DestPtr, llvm::Value *SrcPtr,
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QualType EltTy);
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void EmitAggregateClear(llvm::Value *DestPtr, QualType Ty);
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/// isDummyBlock - Return true if BB is an empty basic block
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/// with no predecessors.
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static bool isDummyBlock(const llvm::BasicBlock *BB);
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/// StartBlock - Start new block named N. If insert block is a dummy block
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/// then reuse it.
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void StartBlock(const char *N);
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/// getCGRecordLayout - Return record layout info.
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const CGRecordLayout *getCGRecordLayout(CodeGenTypes &CGT, QualType RTy);
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/// GetAddrOfStaticLocalVar - Return the address of a static local variable.
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llvm::Constant *GetAddrOfStaticLocalVar(const VarDecl *BVD);
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/// getAccessedFieldNo - Given an encoded value and a result number, return
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/// the input field number being accessed.
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static unsigned getAccessedFieldNo(unsigned Idx, const llvm::Constant *Elts);
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unsigned GetIDForAddrOfLabel(const LabelStmt *L);
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/// EmitMemSetToZero - Generate code to memset a value of the given type to 0;
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void EmitMemSetToZero(llvm::Value *DestPtr, QualType Ty);
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//===--------------------------------------------------------------------===//
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// Declaration Emission
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//===--------------------------------------------------------------------===//
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void EmitDecl(const Decl &D);
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void EmitBlockVarDecl(const VarDecl &D);
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void EmitLocalBlockVarDecl(const VarDecl &D);
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void EmitStaticBlockVarDecl(const VarDecl &D);
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/// EmitParmDecl - Emit a ParmVarDecl or an ImplicitParamDecl.
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void EmitParmDecl(const VarDecl &D, llvm::Value *Arg);
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//===--------------------------------------------------------------------===//
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// Statement Emission
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//===--------------------------------------------------------------------===//
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void EmitStmt(const Stmt *S);
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RValue EmitCompoundStmt(const CompoundStmt &S, bool GetLast = false,
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llvm::Value *AggLoc = 0, bool isAggVol = false);
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void EmitLabel(const LabelStmt &S); // helper for EmitLabelStmt.
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void EmitLabelStmt(const LabelStmt &S);
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void EmitGotoStmt(const GotoStmt &S);
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void EmitIndirectGotoStmt(const IndirectGotoStmt &S);
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void EmitIfStmt(const IfStmt &S);
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void EmitWhileStmt(const WhileStmt &S);
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void EmitDoStmt(const DoStmt &S);
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void EmitForStmt(const ForStmt &S);
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void EmitReturnStmt(const ReturnStmt &S);
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void EmitDeclStmt(const DeclStmt &S);
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void EmitBreakStmt();
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void EmitContinueStmt();
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void EmitSwitchStmt(const SwitchStmt &S);
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void EmitDefaultStmt(const DefaultStmt &S);
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void EmitCaseStmt(const CaseStmt &S);
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void EmitCaseStmtRange(const CaseStmt &S);
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void EmitAsmStmt(const AsmStmt &S);
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void EmitObjCForCollectionStmt(const ObjCForCollectionStmt &S);
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void EmitObjCAtTryStmt(const ObjCAtTryStmt &S);
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void EmitObjCAtThrowStmt(const ObjCAtThrowStmt &S);
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//===--------------------------------------------------------------------===//
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// LValue Expression Emission
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//===--------------------------------------------------------------------===//
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/// EmitUnsupportedLValue - Emit a dummy l-value using the type of E
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/// and issue an ErrorUnsupported style diagnostic (using the
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/// provided Name).
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LValue EmitUnsupportedLValue(const Expr *E,
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const char *Name);
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/// EmitLValue - Emit code to compute a designator that specifies the location
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/// of the expression.
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///
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/// This can return one of two things: a simple address or a bitfield
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/// reference. In either case, the LLVM Value* in the LValue structure is
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/// guaranteed to be an LLVM pointer type.
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///
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/// If this returns a bitfield reference, nothing about the pointee type of
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/// the LLVM value is known: For example, it may not be a pointer to an
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/// integer.
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///
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/// If this returns a normal address, and if the lvalue's C type is fixed
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/// size, this method guarantees that the returned pointer type will point to
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/// an LLVM type of the same size of the lvalue's type. If the lvalue has a
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/// variable length type, this is not possible.
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///
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LValue EmitLValue(const Expr *E);
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/// EmitLoadOfLValue - Given an expression that represents a value lvalue,
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/// this method emits the address of the lvalue, then loads the result as an
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/// rvalue, returning the rvalue.
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RValue EmitLoadOfLValue(LValue V, QualType LVType);
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RValue EmitLoadOfExtVectorElementLValue(LValue V, QualType LVType);
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RValue EmitLoadOfBitfieldLValue(LValue LV, QualType ExprType);
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RValue EmitLoadOfPropertyRefLValue(LValue LV, QualType ExprType);
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/// EmitStoreThroughLValue - Store the specified rvalue into the specified
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/// lvalue, where both are guaranteed to the have the same type, and that type
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/// is 'Ty'.
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void EmitStoreThroughLValue(RValue Src, LValue Dst, QualType Ty);
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void EmitStoreThroughExtVectorComponentLValue(RValue Src, LValue Dst,
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QualType Ty);
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void EmitStoreThroughBitfieldLValue(RValue Src, LValue Dst, QualType Ty);
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void EmitStoreThroughPropertyRefLValue(RValue Src, LValue Dst, QualType Ty);
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// Note: only availabe for agg return types
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LValue EmitBinaryOperatorLValue(const BinaryOperator *E);
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// Note: only availabe for agg return types
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LValue EmitCallExprLValue(const CallExpr *E);
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LValue EmitDeclRefLValue(const DeclRefExpr *E);
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LValue EmitStringLiteralLValue(const StringLiteral *E);
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LValue EmitPredefinedLValue(const PredefinedExpr *E);
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LValue EmitUnaryOpLValue(const UnaryOperator *E);
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LValue EmitArraySubscriptExpr(const ArraySubscriptExpr *E);
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LValue EmitExtVectorElementExpr(const ExtVectorElementExpr *E);
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LValue EmitMemberExpr(const MemberExpr *E);
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LValue EmitCompoundLiteralLValue(const CompoundLiteralExpr *E);
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LValue EmitLValueForField(llvm::Value* Base, FieldDecl* Field,
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bool isUnion, unsigned CVRQualifiers);
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LValue EmitCXXConditionDeclLValue(const CXXConditionDeclExpr *E);
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LValue EmitObjCMessageExprLValue(const ObjCMessageExpr *E);
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LValue EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E);
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LValue EmitObjCPropertyRefLValue(const ObjCPropertyRefExpr *E);
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//===--------------------------------------------------------------------===//
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// Scalar Expression Emission
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//===--------------------------------------------------------------------===//
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/// EmitCall - Generate a call of the given function, expecting the
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/// given result type, and using the given argument list which
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/// specifies both the LLVM arguments and the types they were
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/// derived from.
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RValue EmitCall(llvm::Value *Callee,
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QualType ResultType,
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const CallArgList &Args);
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RValue EmitCallExpr(const CallExpr *E);
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RValue EmitCallExpr(Expr *FnExpr, CallExpr::const_arg_iterator ArgBeg,
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CallExpr::const_arg_iterator ArgEnd);
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RValue EmitCallExpr(llvm::Value *Callee, QualType FnType,
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CallExpr::const_arg_iterator ArgBeg,
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CallExpr::const_arg_iterator ArgEnd);
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RValue EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
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llvm::Value *EmitX86BuiltinExpr(unsigned BuiltinID, const CallExpr *E);
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llvm::Value *EmitPPCBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
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llvm::Value *EmitShuffleVector(llvm::Value* V1, llvm::Value *V2, ...);
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llvm::Value *EmitVector(llvm::Value * const *Vals, unsigned NumVals,
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bool isSplat = false);
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llvm::Value *EmitObjCProtocolExpr(const ObjCProtocolExpr *E);
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llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E);
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llvm::Value *EmitObjCSelectorExpr(const ObjCSelectorExpr *E);
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RValue EmitObjCMessageExpr(const ObjCMessageExpr *E);
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RValue EmitObjCPropertyGet(const ObjCPropertyRefExpr *E);
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void EmitObjCPropertySet(const ObjCPropertyRefExpr *E, RValue Src);
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//===--------------------------------------------------------------------===//
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// Expression Emission
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//===--------------------------------------------------------------------===//
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// Expressions are broken into three classes: scalar, complex, aggregate.
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/// EmitScalarExpr - Emit the computation of the specified expression of
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/// LLVM scalar type, returning the result.
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llvm::Value *EmitScalarExpr(const Expr *E);
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/// EmitScalarConversion - Emit a conversion from the specified type to the
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/// specified destination type, both of which are LLVM scalar types.
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llvm::Value *EmitScalarConversion(llvm::Value *Src, QualType SrcTy,
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QualType DstTy);
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/// EmitComplexToScalarConversion - Emit a conversion from the specified
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/// complex type to the specified destination type, where the destination
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/// type is an LLVM scalar type.
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llvm::Value *EmitComplexToScalarConversion(ComplexPairTy Src, QualType SrcTy,
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QualType DstTy);
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/// EmitAggExpr - Emit the computation of the specified expression of
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/// aggregate type. The result is computed into DestPtr. Note that if
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/// DestPtr is null, the value of the aggregate expression is not needed.
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void EmitAggExpr(const Expr *E, llvm::Value *DestPtr, bool VolatileDest);
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/// EmitComplexExpr - Emit the computation of the specified expression of
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/// complex type, returning the result.
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ComplexPairTy EmitComplexExpr(const Expr *E);
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/// EmitComplexExprIntoAddr - Emit the computation of the specified expression
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/// of complex type, storing into the specified Value*.
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void EmitComplexExprIntoAddr(const Expr *E, llvm::Value *DestAddr,
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bool DestIsVolatile);
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/// StoreComplexToAddr - Store a complex number into the specified address.
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void StoreComplexToAddr(ComplexPairTy V, llvm::Value *DestAddr,
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bool DestIsVolatile);
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/// LoadComplexFromAddr - Load a complex number from the specified address.
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ComplexPairTy LoadComplexFromAddr(llvm::Value *SrcAddr, bool SrcIsVolatile);
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/// GenerateStaticBlockVarDecl - return the the static
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/// declaration of local variable.
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llvm::GlobalValue *GenerateStaticBlockVarDecl(const VarDecl &D,
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bool NoInit,
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const char *Separator);
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// GenerateStaticBlockVarDecl - return the static declaration of
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// a local variable. Performs initialization of the variable if necessary.
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llvm::GlobalValue *GenerateStaticCXXBlockVarDecl(const VarDecl &D);
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//===--------------------------------------------------------------------===//
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// Internal Helpers
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//===--------------------------------------------------------------------===//
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private:
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/// EmitIndirectSwitches - Emit code for all of the switch
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/// instructions in IndirectSwitches.
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void EmitIndirectSwitches();
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};
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} // end namespace CodeGen
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} // end namespace clang
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#endif
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