f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
489 lines
15 KiB
C++
489 lines
15 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/CharUnits.h"
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#include "clang/AST/Type.h"
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#include "llvm/IR/Value.h"
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namespace llvm {
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class Constant;
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class MDNode;
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}
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namespace clang {
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namespace CodeGen {
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class AggValueSlot;
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struct 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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/// Does an ARC strong l-value have precise lifetime?
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enum ARCPreciseLifetime_t {
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ARCImpreciseLifetime, ARCPreciseLifetime
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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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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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} 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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};
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QualType Type;
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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. (For vector elements,
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// this is the alignment of the whole vector.)
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int64_t 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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// Lvalue has ARC imprecise lifetime. We store this inverted to try
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// to make the default bitfield pattern all-zeroes.
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bool ImpreciseLifetime : 1;
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Expr *BaseIvarExp;
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/// Used by struct-path-aware TBAA.
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QualType TBAABaseType;
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/// Offset relative to the base type.
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uint64_t TBAAOffset;
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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(QualType Type, Qualifiers Quals,
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CharUnits Alignment,
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llvm::MDNode *TBAAInfo = 0) {
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this->Type = Type;
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this->Quals = Quals;
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this->Alignment = Alignment.getQuantity();
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assert(this->Alignment == Alignment.getQuantity() &&
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"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->ImpreciseLifetime = false;
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this->ThreadLocalRef = false;
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this->BaseIvarExp = 0;
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// Initialize fields for TBAA.
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this->TBAABaseType = Type;
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this->TBAAOffset = 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 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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QualType getType() const { return Type; }
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Qualifiers::ObjCLifetime getObjCLifetime() const {
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return Quals.getObjCLifetime();
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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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ARCPreciseLifetime_t isARCPreciseLifetime() const {
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return ARCPreciseLifetime_t(!ImpreciseLifetime);
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}
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void setARCPreciseLifetime(ARCPreciseLifetime_t value) {
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ImpreciseLifetime = (value == ARCImpreciseLifetime);
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}
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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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bool isVolatile() const {
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return Quals.hasVolatile();
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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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QualType getTBAABaseType() const { return TBAABaseType; }
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void setTBAABaseType(QualType T) { TBAABaseType = T; }
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uint64_t getTBAAOffset() const { return TBAAOffset; }
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void setTBAAOffset(uint64_t O) { TBAAOffset = O; }
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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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CharUnits getAlignment() const { return CharUnits::fromQuantity(Alignment); }
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void setAlignment(CharUnits A) { Alignment = A.getQuantity(); }
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// simple lvalue
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llvm::Value *getAddress() const { assert(isSimple()); return V; }
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void setAddress(llvm::Value *address) {
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assert(isSimple());
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V = address;
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}
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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 *getBitFieldAddr() 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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static LValue MakeAddr(llvm::Value *address, QualType type,
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CharUnits alignment, ASTContext &Context,
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llvm::MDNode *TBAAInfo = 0) {
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Qualifiers qs = type.getQualifiers();
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qs.setObjCGCAttr(Context.getObjCGCAttrKind(type));
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LValue R;
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R.LVType = Simple;
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R.V = address;
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R.Initialize(type, qs, 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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QualType type, CharUnits Alignment) {
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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(type, type.getQualifiers(), Alignment);
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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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QualType type, CharUnits Alignment) {
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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(type, type.getQualifiers(), Alignment);
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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 Addr - The base address of the bit-field sequence this
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/// bit-field refers to.
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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 *Addr,
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const CGBitFieldInfo &Info,
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QualType type, CharUnits Alignment) {
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LValue R;
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R.LVType = BitField;
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R.V = Addr;
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R.BitFieldInfo = &Info;
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R.Initialize(type, type.getQualifiers(), Alignment);
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return R;
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}
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RValue asAggregateRValue() const {
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// FIMXE: Alignment
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return RValue::getAggregate(getAddress(), isVolatileQualified());
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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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// Qualifiers
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Qualifiers Quals;
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unsigned short Alignment;
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/// DestructedFlag - This is set to true if some external code is
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/// responsible for setting up a destructor for the slot. Otherwise
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/// the code which constructs it should push the appropriate cleanup.
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bool DestructedFlag : 1;
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/// ObjCGCFlag - This is set to true if writing to the memory in the
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/// slot might require calling an appropriate Objective-C GC
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/// barrier. The exact interaction here is unnecessarily mysterious.
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bool ObjCGCFlag : 1;
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/// ZeroedFlag - This is set to true if the memory in the slot is
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/// known to be zero before the assignment into it. This means that
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/// zero fields don't need to be set.
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bool ZeroedFlag : 1;
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/// AliasedFlag - This is set to true if the slot might be aliased
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/// and it's not undefined behavior to access it through such an
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/// alias. Note that it's always undefined behavior to access a C++
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/// object that's under construction through an alias derived from
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/// outside the construction process.
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///
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/// This flag controls whether calls that produce the aggregate
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/// value may be evaluated directly into the slot, or whether they
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/// must be evaluated into an unaliased temporary and then memcpy'ed
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/// over. Since it's invalid in general to memcpy a non-POD C++
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/// object, it's important that this flag never be set when
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/// evaluating an expression which constructs such an object.
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bool AliasedFlag : 1;
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public:
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enum IsAliased_t { IsNotAliased, IsAliased };
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enum IsDestructed_t { IsNotDestructed, IsDestructed };
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enum IsZeroed_t { IsNotZeroed, IsZeroed };
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enum NeedsGCBarriers_t { DoesNotNeedGCBarriers, NeedsGCBarriers };
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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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return forAddr(0, CharUnits(), Qualifiers(), IsNotDestructed,
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DoesNotNeedGCBarriers, IsNotAliased);
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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 quals - The qualifiers that dictate how the slot should
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/// be initialied. Only 'volatile' and the Objective-C lifetime
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/// qualifiers matter.
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///
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/// \param isDestructed - true if something else is responsible
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/// for calling destructors on this object
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/// \param needsGC - true if the slot is potentially located
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/// somewhere that ObjC GC calls should be emitted for
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static AggValueSlot forAddr(llvm::Value *addr, CharUnits align,
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Qualifiers quals,
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IsDestructed_t isDestructed,
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NeedsGCBarriers_t needsGC,
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IsAliased_t isAliased,
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IsZeroed_t isZeroed = IsNotZeroed) {
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AggValueSlot AV;
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AV.Addr = addr;
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AV.Alignment = align.getQuantity();
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AV.Quals = quals;
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AV.DestructedFlag = isDestructed;
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AV.ObjCGCFlag = needsGC;
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AV.ZeroedFlag = isZeroed;
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AV.AliasedFlag = isAliased;
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return AV;
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}
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static AggValueSlot forLValue(const LValue &LV,
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IsDestructed_t isDestructed,
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NeedsGCBarriers_t needsGC,
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IsAliased_t isAliased,
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IsZeroed_t isZeroed = IsNotZeroed) {
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return forAddr(LV.getAddress(), LV.getAlignment(),
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LV.getQuals(), isDestructed, needsGC, isAliased, isZeroed);
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}
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IsDestructed_t isExternallyDestructed() const {
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return IsDestructed_t(DestructedFlag);
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}
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void setExternallyDestructed(bool destructed = true) {
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DestructedFlag = destructed;
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}
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Qualifiers getQualifiers() const { return Quals; }
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bool isVolatile() const {
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return Quals.hasVolatile();
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}
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void setVolatile(bool flag) {
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Quals.setVolatile(flag);
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}
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Qualifiers::ObjCLifetime getObjCLifetime() const {
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return Quals.getObjCLifetime();
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}
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NeedsGCBarriers_t requiresGCollection() const {
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return NeedsGCBarriers_t(ObjCGCFlag);
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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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CharUnits getAlignment() const {
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return CharUnits::fromQuantity(Alignment);
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}
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IsAliased_t isPotentiallyAliased() const {
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return IsAliased_t(AliasedFlag);
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}
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// FIXME: Alignment?
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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) { ZeroedFlag = V; }
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IsZeroed_t isZeroed() const {
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return IsZeroed_t(ZeroedFlag);
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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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