652 lines
20 KiB
C++
652 lines
20 KiB
C++
//===--- APValue.cpp - Union class for APFloat/APSInt/Complex -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the APValue class.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/APValue.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/DeclCXX.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/Type.h"
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#include "clang/Basic/Diagnostic.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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namespace {
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struct LVBase {
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llvm::PointerIntPair<APValue::LValueBase, 1, bool> BaseAndIsOnePastTheEnd;
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CharUnits Offset;
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unsigned PathLength;
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unsigned CallIndex;
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};
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}
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struct APValue::LV : LVBase {
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static const unsigned InlinePathSpace =
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(DataSize - sizeof(LVBase)) / sizeof(LValuePathEntry);
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/// Path - The sequence of base classes, fields and array indices to follow to
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/// walk from Base to the subobject. When performing GCC-style folding, there
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/// may not be such a path.
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union {
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LValuePathEntry Path[InlinePathSpace];
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LValuePathEntry *PathPtr;
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};
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LV() { PathLength = (unsigned)-1; }
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~LV() { resizePath(0); }
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void resizePath(unsigned Length) {
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if (Length == PathLength)
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return;
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if (hasPathPtr())
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delete [] PathPtr;
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PathLength = Length;
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if (hasPathPtr())
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PathPtr = new LValuePathEntry[Length];
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}
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bool hasPath() const { return PathLength != (unsigned)-1; }
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bool hasPathPtr() const { return hasPath() && PathLength > InlinePathSpace; }
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LValuePathEntry *getPath() { return hasPathPtr() ? PathPtr : Path; }
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const LValuePathEntry *getPath() const {
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return hasPathPtr() ? PathPtr : Path;
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}
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};
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namespace {
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struct MemberPointerBase {
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llvm::PointerIntPair<const ValueDecl*, 1, bool> MemberAndIsDerivedMember;
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unsigned PathLength;
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};
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}
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struct APValue::MemberPointerData : MemberPointerBase {
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static const unsigned InlinePathSpace =
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(DataSize - sizeof(MemberPointerBase)) / sizeof(const CXXRecordDecl*);
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typedef const CXXRecordDecl *PathElem;
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union {
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PathElem Path[InlinePathSpace];
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PathElem *PathPtr;
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};
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MemberPointerData() { PathLength = 0; }
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~MemberPointerData() { resizePath(0); }
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void resizePath(unsigned Length) {
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if (Length == PathLength)
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return;
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if (hasPathPtr())
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delete [] PathPtr;
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PathLength = Length;
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if (hasPathPtr())
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PathPtr = new PathElem[Length];
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}
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bool hasPathPtr() const { return PathLength > InlinePathSpace; }
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PathElem *getPath() { return hasPathPtr() ? PathPtr : Path; }
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const PathElem *getPath() const {
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return hasPathPtr() ? PathPtr : Path;
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}
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};
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// FIXME: Reduce the malloc traffic here.
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APValue::Arr::Arr(unsigned NumElts, unsigned Size) :
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Elts(new APValue[NumElts + (NumElts != Size ? 1 : 0)]),
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NumElts(NumElts), ArrSize(Size) {}
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APValue::Arr::~Arr() { delete [] Elts; }
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APValue::StructData::StructData(unsigned NumBases, unsigned NumFields) :
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Elts(new APValue[NumBases+NumFields]),
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NumBases(NumBases), NumFields(NumFields) {}
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APValue::StructData::~StructData() {
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delete [] Elts;
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}
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APValue::UnionData::UnionData() : Field(nullptr), Value(new APValue) {}
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APValue::UnionData::~UnionData () {
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delete Value;
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}
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APValue::APValue(const APValue &RHS) : Kind(Uninitialized) {
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switch (RHS.getKind()) {
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case Uninitialized:
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break;
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case Int:
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MakeInt();
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setInt(RHS.getInt());
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break;
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case Float:
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MakeFloat();
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setFloat(RHS.getFloat());
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break;
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case Vector:
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MakeVector();
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setVector(((const Vec *)(const char *)RHS.Data.buffer)->Elts,
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RHS.getVectorLength());
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break;
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case ComplexInt:
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MakeComplexInt();
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setComplexInt(RHS.getComplexIntReal(), RHS.getComplexIntImag());
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break;
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case ComplexFloat:
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MakeComplexFloat();
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setComplexFloat(RHS.getComplexFloatReal(), RHS.getComplexFloatImag());
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break;
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case LValue:
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MakeLValue();
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if (RHS.hasLValuePath())
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setLValue(RHS.getLValueBase(), RHS.getLValueOffset(), RHS.getLValuePath(),
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RHS.isLValueOnePastTheEnd(), RHS.getLValueCallIndex());
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else
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setLValue(RHS.getLValueBase(), RHS.getLValueOffset(), NoLValuePath(),
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RHS.getLValueCallIndex());
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break;
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case Array:
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MakeArray(RHS.getArrayInitializedElts(), RHS.getArraySize());
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for (unsigned I = 0, N = RHS.getArrayInitializedElts(); I != N; ++I)
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getArrayInitializedElt(I) = RHS.getArrayInitializedElt(I);
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if (RHS.hasArrayFiller())
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getArrayFiller() = RHS.getArrayFiller();
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break;
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case Struct:
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MakeStruct(RHS.getStructNumBases(), RHS.getStructNumFields());
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for (unsigned I = 0, N = RHS.getStructNumBases(); I != N; ++I)
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getStructBase(I) = RHS.getStructBase(I);
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for (unsigned I = 0, N = RHS.getStructNumFields(); I != N; ++I)
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getStructField(I) = RHS.getStructField(I);
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break;
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case Union:
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MakeUnion();
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setUnion(RHS.getUnionField(), RHS.getUnionValue());
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break;
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case MemberPointer:
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MakeMemberPointer(RHS.getMemberPointerDecl(),
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RHS.isMemberPointerToDerivedMember(),
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RHS.getMemberPointerPath());
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break;
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case AddrLabelDiff:
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MakeAddrLabelDiff();
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setAddrLabelDiff(RHS.getAddrLabelDiffLHS(), RHS.getAddrLabelDiffRHS());
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break;
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}
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}
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void APValue::DestroyDataAndMakeUninit() {
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if (Kind == Int)
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((APSInt*)(char*)Data.buffer)->~APSInt();
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else if (Kind == Float)
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((APFloat*)(char*)Data.buffer)->~APFloat();
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else if (Kind == Vector)
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((Vec*)(char*)Data.buffer)->~Vec();
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else if (Kind == ComplexInt)
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((ComplexAPSInt*)(char*)Data.buffer)->~ComplexAPSInt();
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else if (Kind == ComplexFloat)
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((ComplexAPFloat*)(char*)Data.buffer)->~ComplexAPFloat();
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else if (Kind == LValue)
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((LV*)(char*)Data.buffer)->~LV();
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else if (Kind == Array)
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((Arr*)(char*)Data.buffer)->~Arr();
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else if (Kind == Struct)
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((StructData*)(char*)Data.buffer)->~StructData();
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else if (Kind == Union)
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((UnionData*)(char*)Data.buffer)->~UnionData();
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else if (Kind == MemberPointer)
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((MemberPointerData*)(char*)Data.buffer)->~MemberPointerData();
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else if (Kind == AddrLabelDiff)
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((AddrLabelDiffData*)(char*)Data.buffer)->~AddrLabelDiffData();
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Kind = Uninitialized;
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}
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bool APValue::needsCleanup() const {
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switch (getKind()) {
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case Uninitialized:
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case AddrLabelDiff:
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return false;
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case Struct:
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case Union:
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case Array:
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case Vector:
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return true;
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case Int:
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return getInt().needsCleanup();
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case Float:
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return getFloat().needsCleanup();
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case ComplexFloat:
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assert(getComplexFloatImag().needsCleanup() ==
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getComplexFloatReal().needsCleanup() &&
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"In _Complex float types, real and imaginary values always have the "
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"same size.");
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return getComplexFloatReal().needsCleanup();
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case ComplexInt:
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assert(getComplexIntImag().needsCleanup() ==
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getComplexIntReal().needsCleanup() &&
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"In _Complex int types, real and imaginary values must have the "
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"same size.");
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return getComplexIntReal().needsCleanup();
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case LValue:
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return reinterpret_cast<const LV *>(Data.buffer)->hasPathPtr();
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case MemberPointer:
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return reinterpret_cast<const MemberPointerData *>(Data.buffer)
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->hasPathPtr();
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}
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llvm_unreachable("Unknown APValue kind!");
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}
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void APValue::swap(APValue &RHS) {
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std::swap(Kind, RHS.Kind);
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char TmpData[DataSize];
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memcpy(TmpData, Data.buffer, DataSize);
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memcpy(Data.buffer, RHS.Data.buffer, DataSize);
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memcpy(RHS.Data.buffer, TmpData, DataSize);
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}
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void APValue::dump() const {
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dump(llvm::errs());
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llvm::errs() << '\n';
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}
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static double GetApproxValue(const llvm::APFloat &F) {
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llvm::APFloat V = F;
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bool ignored;
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V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
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&ignored);
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return V.convertToDouble();
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}
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void APValue::dump(raw_ostream &OS) const {
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switch (getKind()) {
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case Uninitialized:
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OS << "Uninitialized";
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return;
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case Int:
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OS << "Int: " << getInt();
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return;
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case Float:
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OS << "Float: " << GetApproxValue(getFloat());
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return;
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case Vector:
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OS << "Vector: ";
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getVectorElt(0).dump(OS);
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for (unsigned i = 1; i != getVectorLength(); ++i) {
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OS << ", ";
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getVectorElt(i).dump(OS);
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}
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return;
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case ComplexInt:
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OS << "ComplexInt: " << getComplexIntReal() << ", " << getComplexIntImag();
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return;
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case ComplexFloat:
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OS << "ComplexFloat: " << GetApproxValue(getComplexFloatReal())
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<< ", " << GetApproxValue(getComplexFloatImag());
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return;
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case LValue:
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OS << "LValue: <todo>";
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return;
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case Array:
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OS << "Array: ";
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for (unsigned I = 0, N = getArrayInitializedElts(); I != N; ++I) {
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getArrayInitializedElt(I).dump(OS);
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if (I != getArraySize() - 1) OS << ", ";
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}
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if (hasArrayFiller()) {
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OS << getArraySize() - getArrayInitializedElts() << " x ";
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getArrayFiller().dump(OS);
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}
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return;
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case Struct:
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OS << "Struct ";
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if (unsigned N = getStructNumBases()) {
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OS << " bases: ";
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getStructBase(0).dump(OS);
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for (unsigned I = 1; I != N; ++I) {
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OS << ", ";
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getStructBase(I).dump(OS);
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}
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}
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if (unsigned N = getStructNumFields()) {
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OS << " fields: ";
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getStructField(0).dump(OS);
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for (unsigned I = 1; I != N; ++I) {
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OS << ", ";
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getStructField(I).dump(OS);
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}
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}
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return;
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case Union:
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OS << "Union: ";
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getUnionValue().dump(OS);
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return;
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case MemberPointer:
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OS << "MemberPointer: <todo>";
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return;
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case AddrLabelDiff:
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OS << "AddrLabelDiff: <todo>";
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return;
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}
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llvm_unreachable("Unknown APValue kind!");
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}
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void APValue::printPretty(raw_ostream &Out, ASTContext &Ctx, QualType Ty) const{
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switch (getKind()) {
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case APValue::Uninitialized:
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Out << "<uninitialized>";
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return;
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case APValue::Int:
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if (Ty->isBooleanType())
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Out << (getInt().getBoolValue() ? "true" : "false");
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else
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Out << getInt();
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return;
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case APValue::Float:
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Out << GetApproxValue(getFloat());
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return;
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case APValue::Vector: {
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Out << '{';
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QualType ElemTy = Ty->getAs<VectorType>()->getElementType();
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getVectorElt(0).printPretty(Out, Ctx, ElemTy);
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for (unsigned i = 1; i != getVectorLength(); ++i) {
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Out << ", ";
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getVectorElt(i).printPretty(Out, Ctx, ElemTy);
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}
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Out << '}';
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return;
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}
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case APValue::ComplexInt:
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Out << getComplexIntReal() << "+" << getComplexIntImag() << "i";
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return;
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case APValue::ComplexFloat:
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Out << GetApproxValue(getComplexFloatReal()) << "+"
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<< GetApproxValue(getComplexFloatImag()) << "i";
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return;
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case APValue::LValue: {
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LValueBase Base = getLValueBase();
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if (!Base) {
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Out << "0";
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return;
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}
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bool IsReference = Ty->isReferenceType();
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QualType InnerTy
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= IsReference ? Ty.getNonReferenceType() : Ty->getPointeeType();
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if (InnerTy.isNull())
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InnerTy = Ty;
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if (!hasLValuePath()) {
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// No lvalue path: just print the offset.
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CharUnits O = getLValueOffset();
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CharUnits S = Ctx.getTypeSizeInChars(InnerTy);
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if (!O.isZero()) {
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if (IsReference)
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Out << "*(";
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if (O % S) {
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Out << "(char*)";
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S = CharUnits::One();
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}
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Out << '&';
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} else if (!IsReference)
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Out << '&';
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if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>())
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Out << *VD;
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else {
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assert(Base.get<const Expr *>() != nullptr &&
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"Expecting non-null Expr");
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Base.get<const Expr*>()->printPretty(Out, nullptr,
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Ctx.getPrintingPolicy());
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}
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if (!O.isZero()) {
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Out << " + " << (O / S);
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if (IsReference)
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Out << ')';
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}
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return;
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}
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// We have an lvalue path. Print it out nicely.
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if (!IsReference)
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Out << '&';
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else if (isLValueOnePastTheEnd())
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Out << "*(&";
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QualType ElemTy;
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if (const ValueDecl *VD = Base.dyn_cast<const ValueDecl*>()) {
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Out << *VD;
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ElemTy = VD->getType();
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} else {
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const Expr *E = Base.get<const Expr*>();
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assert(E != nullptr && "Expecting non-null Expr");
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E->printPretty(Out, nullptr, Ctx.getPrintingPolicy());
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ElemTy = E->getType();
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}
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ArrayRef<LValuePathEntry> Path = getLValuePath();
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const CXXRecordDecl *CastToBase = nullptr;
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for (unsigned I = 0, N = Path.size(); I != N; ++I) {
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if (ElemTy->getAs<RecordType>()) {
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// The lvalue refers to a class type, so the next path entry is a base
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// or member.
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const Decl *BaseOrMember =
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BaseOrMemberType::getFromOpaqueValue(Path[I].BaseOrMember).getPointer();
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if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(BaseOrMember)) {
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CastToBase = RD;
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ElemTy = Ctx.getRecordType(RD);
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} else {
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const ValueDecl *VD = cast<ValueDecl>(BaseOrMember);
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Out << ".";
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if (CastToBase)
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Out << *CastToBase << "::";
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Out << *VD;
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ElemTy = VD->getType();
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}
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} else {
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// The lvalue must refer to an array.
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Out << '[' << Path[I].ArrayIndex << ']';
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ElemTy = Ctx.getAsArrayType(ElemTy)->getElementType();
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}
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}
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// Handle formatting of one-past-the-end lvalues.
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if (isLValueOnePastTheEnd()) {
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// FIXME: If CastToBase is non-0, we should prefix the output with
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// "(CastToBase*)".
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Out << " + 1";
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if (IsReference)
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Out << ')';
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}
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return;
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}
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case APValue::Array: {
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const ArrayType *AT = Ctx.getAsArrayType(Ty);
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QualType ElemTy = AT->getElementType();
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Out << '{';
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if (unsigned N = getArrayInitializedElts()) {
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getArrayInitializedElt(0).printPretty(Out, Ctx, ElemTy);
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for (unsigned I = 1; I != N; ++I) {
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Out << ", ";
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if (I == 10) {
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// Avoid printing out the entire contents of large arrays.
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Out << "...";
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break;
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}
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getArrayInitializedElt(I).printPretty(Out, Ctx, ElemTy);
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}
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}
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Out << '}';
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return;
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}
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case APValue::Struct: {
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Out << '{';
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const RecordDecl *RD = Ty->getAs<RecordType>()->getDecl();
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bool First = true;
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if (unsigned N = getStructNumBases()) {
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const CXXRecordDecl *CD = cast<CXXRecordDecl>(RD);
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CXXRecordDecl::base_class_const_iterator BI = CD->bases_begin();
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for (unsigned I = 0; I != N; ++I, ++BI) {
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assert(BI != CD->bases_end());
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if (!First)
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Out << ", ";
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getStructBase(I).printPretty(Out, Ctx, BI->getType());
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First = false;
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}
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}
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for (const auto *FI : RD->fields()) {
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if (!First)
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Out << ", ";
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if (FI->isUnnamedBitfield()) continue;
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getStructField(FI->getFieldIndex()).
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printPretty(Out, Ctx, FI->getType());
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First = false;
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}
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Out << '}';
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return;
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}
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case APValue::Union:
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Out << '{';
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if (const FieldDecl *FD = getUnionField()) {
|
|
Out << "." << *FD << " = ";
|
|
getUnionValue().printPretty(Out, Ctx, FD->getType());
|
|
}
|
|
Out << '}';
|
|
return;
|
|
case APValue::MemberPointer:
|
|
// FIXME: This is not enough to unambiguously identify the member in a
|
|
// multiple-inheritance scenario.
|
|
if (const ValueDecl *VD = getMemberPointerDecl()) {
|
|
Out << '&' << *cast<CXXRecordDecl>(VD->getDeclContext()) << "::" << *VD;
|
|
return;
|
|
}
|
|
Out << "0";
|
|
return;
|
|
case APValue::AddrLabelDiff:
|
|
Out << "&&" << getAddrLabelDiffLHS()->getLabel()->getName();
|
|
Out << " - ";
|
|
Out << "&&" << getAddrLabelDiffRHS()->getLabel()->getName();
|
|
return;
|
|
}
|
|
llvm_unreachable("Unknown APValue kind!");
|
|
}
|
|
|
|
std::string APValue::getAsString(ASTContext &Ctx, QualType Ty) const {
|
|
std::string Result;
|
|
llvm::raw_string_ostream Out(Result);
|
|
printPretty(Out, Ctx, Ty);
|
|
Out.flush();
|
|
return Result;
|
|
}
|
|
|
|
const APValue::LValueBase APValue::getLValueBase() const {
|
|
assert(isLValue() && "Invalid accessor");
|
|
return ((const LV*)(const void*)Data.buffer)->BaseAndIsOnePastTheEnd.getPointer();
|
|
}
|
|
|
|
bool APValue::isLValueOnePastTheEnd() const {
|
|
assert(isLValue() && "Invalid accessor");
|
|
return ((const LV*)(const void*)Data.buffer)->BaseAndIsOnePastTheEnd.getInt();
|
|
}
|
|
|
|
CharUnits &APValue::getLValueOffset() {
|
|
assert(isLValue() && "Invalid accessor");
|
|
return ((LV*)(void*)Data.buffer)->Offset;
|
|
}
|
|
|
|
bool APValue::hasLValuePath() const {
|
|
assert(isLValue() && "Invalid accessor");
|
|
return ((const LV*)(const char*)Data.buffer)->hasPath();
|
|
}
|
|
|
|
ArrayRef<APValue::LValuePathEntry> APValue::getLValuePath() const {
|
|
assert(isLValue() && hasLValuePath() && "Invalid accessor");
|
|
const LV &LVal = *((const LV*)(const char*)Data.buffer);
|
|
return llvm::makeArrayRef(LVal.getPath(), LVal.PathLength);
|
|
}
|
|
|
|
unsigned APValue::getLValueCallIndex() const {
|
|
assert(isLValue() && "Invalid accessor");
|
|
return ((const LV*)(const char*)Data.buffer)->CallIndex;
|
|
}
|
|
|
|
void APValue::setLValue(LValueBase B, const CharUnits &O, NoLValuePath,
|
|
unsigned CallIndex) {
|
|
assert(isLValue() && "Invalid accessor");
|
|
LV &LVal = *((LV*)(char*)Data.buffer);
|
|
LVal.BaseAndIsOnePastTheEnd.setPointer(B);
|
|
LVal.BaseAndIsOnePastTheEnd.setInt(false);
|
|
LVal.Offset = O;
|
|
LVal.CallIndex = CallIndex;
|
|
LVal.resizePath((unsigned)-1);
|
|
}
|
|
|
|
void APValue::setLValue(LValueBase B, const CharUnits &O,
|
|
ArrayRef<LValuePathEntry> Path, bool IsOnePastTheEnd,
|
|
unsigned CallIndex) {
|
|
assert(isLValue() && "Invalid accessor");
|
|
LV &LVal = *((LV*)(char*)Data.buffer);
|
|
LVal.BaseAndIsOnePastTheEnd.setPointer(B);
|
|
LVal.BaseAndIsOnePastTheEnd.setInt(IsOnePastTheEnd);
|
|
LVal.Offset = O;
|
|
LVal.CallIndex = CallIndex;
|
|
LVal.resizePath(Path.size());
|
|
memcpy(LVal.getPath(), Path.data(), Path.size() * sizeof(LValuePathEntry));
|
|
}
|
|
|
|
const ValueDecl *APValue::getMemberPointerDecl() const {
|
|
assert(isMemberPointer() && "Invalid accessor");
|
|
const MemberPointerData &MPD =
|
|
*((const MemberPointerData *)(const char *)Data.buffer);
|
|
return MPD.MemberAndIsDerivedMember.getPointer();
|
|
}
|
|
|
|
bool APValue::isMemberPointerToDerivedMember() const {
|
|
assert(isMemberPointer() && "Invalid accessor");
|
|
const MemberPointerData &MPD =
|
|
*((const MemberPointerData *)(const char *)Data.buffer);
|
|
return MPD.MemberAndIsDerivedMember.getInt();
|
|
}
|
|
|
|
ArrayRef<const CXXRecordDecl*> APValue::getMemberPointerPath() const {
|
|
assert(isMemberPointer() && "Invalid accessor");
|
|
const MemberPointerData &MPD =
|
|
*((const MemberPointerData *)(const char *)Data.buffer);
|
|
return llvm::makeArrayRef(MPD.getPath(), MPD.PathLength);
|
|
}
|
|
|
|
void APValue::MakeLValue() {
|
|
assert(isUninit() && "Bad state change");
|
|
static_assert(sizeof(LV) <= DataSize, "LV too big");
|
|
new ((void*)(char*)Data.buffer) LV();
|
|
Kind = LValue;
|
|
}
|
|
|
|
void APValue::MakeArray(unsigned InitElts, unsigned Size) {
|
|
assert(isUninit() && "Bad state change");
|
|
new ((void*)(char*)Data.buffer) Arr(InitElts, Size);
|
|
Kind = Array;
|
|
}
|
|
|
|
void APValue::MakeMemberPointer(const ValueDecl *Member, bool IsDerivedMember,
|
|
ArrayRef<const CXXRecordDecl*> Path) {
|
|
assert(isUninit() && "Bad state change");
|
|
MemberPointerData *MPD = new ((void*)(char*)Data.buffer) MemberPointerData;
|
|
Kind = MemberPointer;
|
|
MPD->MemberAndIsDerivedMember.setPointer(Member);
|
|
MPD->MemberAndIsDerivedMember.setInt(IsDerivedMember);
|
|
MPD->resizePath(Path.size());
|
|
memcpy(MPD->getPath(), Path.data(), Path.size()*sizeof(const CXXRecordDecl*));
|
|
}
|