forked from OSchip/llvm-project
406 lines
12 KiB
C++
406 lines
12 KiB
C++
//===-- CGValue.h - LLVM CodeGen wrappers for llvm::Value* ------*- 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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// These classes implement wrappers around llvm::Value in order to
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// fully represent the range of values for C L- and R- values.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_CODEGEN_CGVALUE_H
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#define CLANG_CODEGEN_CGVALUE_H
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Type.h"
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namespace llvm {
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class Constant;
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class Value;
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}
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namespace clang {
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class ObjCPropertyRefExpr;
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namespace CodeGen {
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class CGBitFieldInfo;
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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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enum Flavor { Scalar, Complex, Aggregate };
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// Stores first value and flavor.
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llvm::PointerIntPair<llvm::Value *, 2, Flavor> V1;
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// Stores second value and volatility.
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llvm::PointerIntPair<llvm::Value *, 1, bool> V2;
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public:
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bool isScalar() const { return V1.getInt() == Scalar; }
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bool isComplex() const { return V1.getInt() == Complex; }
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bool isAggregate() const { return V1.getInt() == Aggregate; }
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bool isVolatileQualified() const { return V2.getInt(); }
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/// getScalarVal() - 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.getPointer();
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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::make_pair(V1.getPointer(), V2.getPointer());
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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.getPointer();
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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.setPointer(V);
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ER.V1.setInt(Scalar);
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ER.V2.setInt(false);
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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.setPointer(V1);
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ER.V2.setPointer(V2);
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ER.V1.setInt(Complex);
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ER.V2.setInt(false);
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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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return getComplex(C.first, C.second);
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}
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// FIXME: Aggregate rvalues need to retain information about whether they are
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// volatile or not. Remove default to find all places that probably get this
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// wrong.
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static RValue getAggregate(llvm::Value *V, bool Volatile = false) {
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RValue ER;
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ER.V1.setPointer(V);
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ER.V1.setInt(Aggregate);
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ER.V2.setInt(Volatile);
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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: 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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ExtVectorElt, // This is an extended vector subset, use getExtVectorComp
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PropertyRef // This is an Objective-C property reference, use
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// getPropertyRefExpr
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} LVType;
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llvm::Value *V;
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union {
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// Index into a vector subscript: V[i]
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llvm::Value *VectorIdx;
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// ExtVector element subset: V.xyx
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llvm::Constant *VectorElts;
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// BitField start bit and size
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const CGBitFieldInfo *BitFieldInfo;
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// Obj-C property reference expression
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const ObjCPropertyRefExpr *PropertyRefExpr;
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};
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// 'const' is unused here
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Qualifiers Quals;
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/// The alignment to use when accessing this lvalue.
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unsigned short Alignment;
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// objective-c's ivar
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bool Ivar:1;
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// objective-c's ivar is an array
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bool ObjIsArray:1;
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// LValue is non-gc'able for any reason, including being a parameter or local
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// variable.
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bool NonGC: 1;
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// Lvalue is a global reference of an objective-c object
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bool GlobalObjCRef : 1;
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// Lvalue is a thread local reference
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bool ThreadLocalRef : 1;
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Expr *BaseIvarExp;
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/// TBAAInfo - TBAA information to attach to dereferences of this LValue.
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llvm::MDNode *TBAAInfo;
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private:
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void Initialize(Qualifiers Quals, unsigned Alignment = 0,
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llvm::MDNode *TBAAInfo = 0) {
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this->Quals = Quals;
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this->Alignment = Alignment;
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assert(this->Alignment == Alignment && "Alignment exceeds allowed max!");
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// Initialize Objective-C flags.
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this->Ivar = this->ObjIsArray = this->NonGC = this->GlobalObjCRef = false;
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this->ThreadLocalRef = false;
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this->BaseIvarExp = 0;
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this->TBAAInfo = TBAAInfo;
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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 isExtVectorElt() const { return LVType == ExtVectorElt; }
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bool isPropertyRef() const { return LVType == PropertyRef; }
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bool isVolatileQualified() const { return Quals.hasVolatile(); }
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bool isRestrictQualified() const { return Quals.hasRestrict(); }
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unsigned getVRQualifiers() const {
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return Quals.getCVRQualifiers() & ~Qualifiers::Const;
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}
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bool isObjCIvar() const { return Ivar; }
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void setObjCIvar(bool Value) { Ivar = Value; }
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bool isObjCArray() const { return ObjIsArray; }
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void setObjCArray(bool Value) { ObjIsArray = Value; }
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bool isNonGC () const { return NonGC; }
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void setNonGC(bool Value) { NonGC = Value; }
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bool isGlobalObjCRef() const { return GlobalObjCRef; }
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void setGlobalObjCRef(bool Value) { GlobalObjCRef = Value; }
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bool isThreadLocalRef() const { return ThreadLocalRef; }
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void setThreadLocalRef(bool Value) { ThreadLocalRef = Value;}
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bool isObjCWeak() const {
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return Quals.getObjCGCAttr() == Qualifiers::Weak;
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}
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bool isObjCStrong() const {
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return Quals.getObjCGCAttr() == Qualifiers::Strong;
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}
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Expr *getBaseIvarExp() const { return BaseIvarExp; }
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void setBaseIvarExp(Expr *V) { BaseIvarExp = V; }
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llvm::MDNode *getTBAAInfo() const { return TBAAInfo; }
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void setTBAAInfo(llvm::MDNode *N) { TBAAInfo = N; }
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const Qualifiers &getQuals() const { return Quals; }
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Qualifiers &getQuals() { return Quals; }
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unsigned getAddressSpace() const { return Quals.getAddressSpace(); }
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unsigned getAlignment() const { return Alignment; }
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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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// extended vector elements.
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llvm::Value *getExtVectorAddr() const { assert(isExtVectorElt()); return V; }
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llvm::Constant *getExtVectorElts() const {
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assert(isExtVectorElt());
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return VectorElts;
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}
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// bitfield lvalue
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llvm::Value *getBitFieldBaseAddr() const {
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assert(isBitField());
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return V;
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}
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const CGBitFieldInfo &getBitFieldInfo() const {
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assert(isBitField());
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return *BitFieldInfo;
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}
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// property ref lvalue
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llvm::Value *getPropertyRefBaseAddr() const {
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assert(isPropertyRef());
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return V;
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}
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const ObjCPropertyRefExpr *getPropertyRefExpr() const {
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assert(isPropertyRef());
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return PropertyRefExpr;
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}
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static LValue MakeAddr(llvm::Value *V, QualType T, unsigned Alignment,
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ASTContext &Context,
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llvm::MDNode *TBAAInfo = 0) {
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Qualifiers Quals = T.getQualifiers();
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Quals.setObjCGCAttr(Context.getObjCGCAttrKind(T));
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LValue R;
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R.LVType = Simple;
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R.V = V;
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R.Initialize(Quals, Alignment, TBAAInfo);
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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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unsigned CVR) {
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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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R.Initialize(Qualifiers::fromCVRMask(CVR));
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return R;
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}
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static LValue MakeExtVectorElt(llvm::Value *Vec, llvm::Constant *Elts,
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unsigned CVR) {
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LValue R;
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R.LVType = ExtVectorElt;
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R.V = Vec;
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R.VectorElts = Elts;
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R.Initialize(Qualifiers::fromCVRMask(CVR));
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return R;
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}
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/// \brief Create a new object to represent a bit-field access.
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///
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/// \param BaseValue - The base address of the structure containing the
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/// bit-field.
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/// \param Info - The information describing how to perform the bit-field
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/// access.
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static LValue MakeBitfield(llvm::Value *BaseValue, const CGBitFieldInfo &Info,
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unsigned CVR) {
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LValue R;
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R.LVType = BitField;
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R.V = BaseValue;
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R.BitFieldInfo = &Info;
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R.Initialize(Qualifiers::fromCVRMask(CVR));
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return R;
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}
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// FIXME: It is probably bad that we aren't emitting the target when we build
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// the lvalue. However, this complicates the code a bit, and I haven't figured
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// out how to make it go wrong yet.
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static LValue MakePropertyRef(const ObjCPropertyRefExpr *E,
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llvm::Value *Base) {
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LValue R;
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R.LVType = PropertyRef;
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R.V = Base;
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R.PropertyRefExpr = E;
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R.Initialize(Qualifiers());
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return R;
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}
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};
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/// An aggregate value slot.
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class AggValueSlot {
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/// The address.
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llvm::Value *Addr;
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// Associated flags.
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bool VolatileFlag : 1;
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bool LifetimeFlag : 1;
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bool RequiresGCollection : 1;
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/// IsZeroed - This is set to true if the destination is known to be zero
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/// before the assignment into it. This means that zero fields don't need to
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/// be set.
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bool IsZeroed : 1;
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public:
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/// ignored - Returns an aggregate value slot indicating that the
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/// aggregate value is being ignored.
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static AggValueSlot ignored() {
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AggValueSlot AV;
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AV.Addr = 0;
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AV.VolatileFlag = AV.LifetimeFlag = AV.RequiresGCollection = AV.IsZeroed =0;
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return AV;
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}
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/// forAddr - Make a slot for an aggregate value.
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///
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/// \param Volatile - true if the slot should be volatile-initialized
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/// \param LifetimeExternallyManaged - true if the slot's lifetime
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/// is being externally managed; false if a destructor should be
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/// registered for any temporaries evaluated into the slot
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/// \param RequiresGCollection - true if the slot is located
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/// somewhere that ObjC GC calls should be emitted for
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static AggValueSlot forAddr(llvm::Value *Addr, bool Volatile,
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bool LifetimeExternallyManaged,
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bool RequiresGCollection = false,
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bool IsZeroed = false) {
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AggValueSlot AV;
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AV.Addr = Addr;
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AV.VolatileFlag = Volatile;
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AV.LifetimeFlag = LifetimeExternallyManaged;
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AV.RequiresGCollection = RequiresGCollection;
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AV.IsZeroed = IsZeroed;
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return AV;
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}
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static AggValueSlot forLValue(LValue LV, bool LifetimeExternallyManaged,
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bool RequiresGCollection = false) {
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return forAddr(LV.getAddress(), LV.isVolatileQualified(),
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LifetimeExternallyManaged, RequiresGCollection);
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}
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bool isLifetimeExternallyManaged() const {
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return LifetimeFlag;
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}
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void setLifetimeExternallyManaged(bool Managed = true) {
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LifetimeFlag = Managed;
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}
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bool isVolatile() const {
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return VolatileFlag;
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}
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bool requiresGCollection() const {
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return RequiresGCollection;
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}
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llvm::Value *getAddr() const {
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return Addr;
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}
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bool isIgnored() const {
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return Addr == 0;
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}
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RValue asRValue() const {
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return RValue::getAggregate(getAddr(), isVolatile());
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}
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void setZeroed(bool V = true) { IsZeroed = V; }
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bool isZeroed() const {
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return IsZeroed;
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}
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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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