e11664a0ef
Now, at AST level record info is maintained by ASTRecordLayout class. Now, at code gen level record info is maintained by CGRecordLayout class. llvm-svn: 43619
431 lines
15 KiB
C++
431 lines
15 KiB
C++
//===--- CodeGenFunction.h - Per-Function state for LLVM CodeGen ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source 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 CODEGEN_CODEGENFUNCTION_H
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#define CODEGEN_CODEGENFUNCTION_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/LLVMBuilder.h"
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#include <vector>
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namespace llvm {
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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 FunctionDecl;
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class TargetInfo;
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class QualType;
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class FunctionTypeProto;
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class Stmt;
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class CompoundStmt;
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class LabelStmt;
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class GotoStmt;
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class IfStmt;
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class WhileStmt;
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class DoStmt;
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class ForStmt;
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class ReturnStmt;
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class DeclStmt;
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class CaseStmt;
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class DefaultStmt;
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class SwitchStmt;
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class Expr;
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class DeclRefExpr;
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class StringLiteral;
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class IntegerLiteral;
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class FloatingLiteral;
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class CharacterLiteral;
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class TypesCompatibleExpr;
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class ImplicitCastExpr;
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class CastExpr;
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class CallExpr;
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class UnaryOperator;
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class BinaryOperator;
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class CompoundAssignOperator;
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class ArraySubscriptExpr;
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class OCUVectorElementExpr;
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class ConditionalOperator;
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class ChooseExpr;
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class PreDefinedExpr;
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class ObjCStringLiteral;
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class MemberExpr;
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class BlockVarDecl;
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class EnumConstantDecl;
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class ParmVarDecl;
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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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/// RValue - This trivial value class is used to represent the result of an
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/// expression that is evaluated. It can be one of three things: either a
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/// simple LLVM SSA value, a pair of SSA values for complex numbers, or the
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/// address of an aggregate value in memory.
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class RValue {
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llvm::Value *V1, *V2;
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// TODO: Encode this into the low bit of pointer for more efficient
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// return-by-value.
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enum { Scalar, Complex, Aggregate } Flavor;
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// FIXME: Aggregate rvalues need to retain information about whether they are
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// volatile or not.
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public:
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bool isScalar() const { return Flavor == Scalar; }
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bool isComplex() const { return Flavor == Complex; }
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bool isAggregate() const { return Flavor == Aggregate; }
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/// getScalar() - Return the Value* of this scalar value.
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llvm::Value *getScalarVal() const {
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assert(isScalar() && "Not a scalar!");
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return V1;
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}
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/// getComplexVal - Return the real/imag components of this complex value.
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///
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std::pair<llvm::Value *, llvm::Value *> getComplexVal() const {
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return std::pair<llvm::Value *, llvm::Value *>(V1, V2);
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}
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/// getAggregateAddr() - Return the Value* of the address of the aggregate.
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llvm::Value *getAggregateAddr() const {
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assert(isAggregate() && "Not an aggregate!");
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return V1;
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}
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static RValue get(llvm::Value *V) {
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RValue ER;
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ER.V1 = V;
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ER.Flavor = Scalar;
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return ER;
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}
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static RValue getComplex(llvm::Value *V1, llvm::Value *V2) {
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RValue ER;
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ER.V1 = V1;
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ER.V2 = V2;
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ER.Flavor = Complex;
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return ER;
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}
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static RValue getComplex(const std::pair<llvm::Value *, llvm::Value *> &C) {
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RValue ER;
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ER.V1 = C.first;
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ER.V2 = C.second;
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ER.Flavor = Complex;
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return ER;
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}
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static RValue getAggregate(llvm::Value *V) {
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RValue ER;
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ER.V1 = V;
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ER.Flavor = Aggregate;
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return ER;
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}
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};
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/// LValue - This represents an lvalue references. Because C/C++ allow
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/// bitfields, this is not a simple LLVM pointer, it may be a pointer plus a
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/// bitrange.
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class LValue {
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// FIXME: Volatility. Restrict?
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// alignment?
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enum {
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Simple, // This is a normal l-value, use getAddress().
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VectorElt, // This is a vector element l-value (V[i]), use getVector*
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BitField, // This is a bitfield l-value, use getBitfield*.
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OCUVectorElt // This is an ocu vector subset, use getOCUVectorComp
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} LVType;
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llvm::Value *V;
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union {
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llvm::Value *VectorIdx; // Index into a vector subscript: V[i]
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unsigned VectorElts; // Encoded OCUVector element subset: V.xyx
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};
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public:
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bool isSimple() const { return LVType == Simple; }
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bool isVectorElt() const { return LVType == VectorElt; }
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bool isBitfield() const { return LVType == BitField; }
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bool isOCUVectorElt() const { return LVType == OCUVectorElt; }
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// simple lvalue
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llvm::Value *getAddress() const { assert(isSimple()); return V; }
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// vector elt lvalue
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llvm::Value *getVectorAddr() const { assert(isVectorElt()); return V; }
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llvm::Value *getVectorIdx() const { assert(isVectorElt()); return VectorIdx; }
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// ocu vector elements.
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llvm::Value *getOCUVectorAddr() const { assert(isOCUVectorElt()); return V; }
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unsigned getOCUVectorElts() const {
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assert(isOCUVectorElt());
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return VectorElts;
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}
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static LValue MakeAddr(llvm::Value *V) {
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LValue R;
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R.LVType = Simple;
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R.V = V;
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return R;
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}
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static LValue MakeVectorElt(llvm::Value *Vec, llvm::Value *Idx) {
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LValue R;
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R.LVType = VectorElt;
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R.V = Vec;
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R.VectorIdx = Idx;
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return R;
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}
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static LValue MakeOCUVectorElt(llvm::Value *Vec, unsigned Elements) {
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LValue R;
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R.LVType = OCUVectorElt;
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R.V = Vec;
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R.VectorElts = Elements;
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return R;
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}
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};
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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::LLVMFoldingBuilder Builder;
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const FunctionDecl *CurFuncDecl;
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llvm::Function *CurFn;
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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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/// 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 GenerateCode(const FunctionDecl *FD);
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const llvm::Type *ConvertType(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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//===--------------------------------------------------------------------===//
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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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/// 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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//===--------------------------------------------------------------------===//
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// Declaration Emission
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//===--------------------------------------------------------------------===//
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void EmitDecl(const Decl &D);
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void EmitEnumConstantDecl(const EnumConstantDecl &D);
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void EmitBlockVarDecl(const BlockVarDecl &D);
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void EmitLocalBlockVarDecl(const BlockVarDecl &D);
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void EmitStaticBlockVarDecl(const BlockVarDecl &D);
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void EmitParmDecl(const ParmVarDecl &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 EmitLabelStmt(const LabelStmt &S);
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void EmitGotoStmt(const GotoStmt &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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//===--------------------------------------------------------------------===//
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// LValue Expression Emission
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//===--------------------------------------------------------------------===//
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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 EmitLoadOfOCUElementLValue(LValue V, QualType LVType);
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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 EmitStoreThroughOCUComponentLValue(RValue Src, LValue Dst, QualType Ty);
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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 EmitOCUVectorElementExpr(const OCUVectorElementExpr *E);
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LValue EmitMemberExpr(const MemberExpr *E);
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//===--------------------------------------------------------------------===//
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// Scalar Expression Emission
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//===--------------------------------------------------------------------===//
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RValue EmitCallExpr(const CallExpr *E);
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RValue EmitCallExpr(llvm::Value *Callee, const CallExpr *E);
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RValue EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E);
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llvm::Value *EmitObjCStringLiteral(const ObjCStringLiteral *E);
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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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/// LoadComplexFromAddr - Load a complex number from the specified address.
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ComplexPairTy LoadComplexFromAddr(llvm::Value *SrcAddr, bool SrcIsVolatile);
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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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