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//===--- APValue.cpp - Union class for APFloat/APSInt/Complex -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the APValue class.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/APValue.h"
#include "clang/AST/CharUnits.h"
#include "clang/Basic/Diagnostic.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/ErrorHandling.h"
using namespace clang;
namespace {
struct LV {
const Expr* Base;
CharUnits Offset;
};
}
APValue::APValue(const Expr* B) : Kind(Uninitialized) {
MakeLValue(); setLValue(B, CharUnits::Zero());
}
const APValue &APValue::operator=(const APValue &RHS) {
if (Kind != RHS.Kind) {
MakeUninit();
if (RHS.isInt())
MakeInt();
else if (RHS.isFloat())
MakeFloat();
else if (RHS.isVector())
MakeVector();
else if (RHS.isComplexInt())
MakeComplexInt();
else if (RHS.isComplexFloat())
MakeComplexFloat();
else if (RHS.isLValue())
MakeLValue();
}
if (isInt())
setInt(RHS.getInt());
else if (isFloat())
setFloat(RHS.getFloat());
else if (isVector())
setVector(((const Vec *)(const char *)RHS.Data)->Elts,
RHS.getVectorLength());
else if (isComplexInt())
setComplexInt(RHS.getComplexIntReal(), RHS.getComplexIntImag());
else if (isComplexFloat())
setComplexFloat(RHS.getComplexFloatReal(), RHS.getComplexFloatImag());
else if (isLValue())
setLValue(RHS.getLValueBase(), RHS.getLValueOffset());
return *this;
}
void APValue::MakeUninit() {
if (Kind == Int)
((APSInt*)(char*)Data)->~APSInt();
else if (Kind == Float)
((APFloat*)(char*)Data)->~APFloat();
else if (Kind == Vector)
((Vec*)(char*)Data)->~Vec();
else if (Kind == ComplexInt)
((ComplexAPSInt*)(char*)Data)->~ComplexAPSInt();
else if (Kind == ComplexFloat)
((ComplexAPFloat*)(char*)Data)->~ComplexAPFloat();
else if (Kind == LValue) {
((LV*)(char*)Data)->~LV();
}
Kind = Uninitialized;
}
void APValue::dump() const {
print(llvm::errs());
llvm::errs() << '\n';
}
static double GetApproxValue(const llvm::APFloat &F) {
llvm::APFloat V = F;
bool ignored;
V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven,
&ignored);
return V.convertToDouble();
}
void APValue::print(raw_ostream &OS) const {
switch (getKind()) {
default: llvm_unreachable("Unknown APValue kind!");
case Uninitialized:
OS << "Uninitialized";
return;
case Int:
OS << "Int: " << getInt();
return;
case Float:
OS << "Float: " << GetApproxValue(getFloat());
return;
case Vector:
OS << "Vector: " << getVectorElt(0);
for (unsigned i = 1; i != getVectorLength(); ++i)
OS << ", " << getVectorElt(i);
return;
case ComplexInt:
OS << "ComplexInt: " << getComplexIntReal() << ", " << getComplexIntImag();
return;
case ComplexFloat:
OS << "ComplexFloat: " << GetApproxValue(getComplexFloatReal())
<< ", " << GetApproxValue(getComplexFloatImag());
case LValue:
OS << "LValue: <todo>";
return;
}
}
static void WriteShortAPValueToStream(raw_ostream& Out,
const APValue& V) {
switch (V.getKind()) {
default: llvm_unreachable("Unknown APValue kind!");
case APValue::Uninitialized:
Out << "Uninitialized";
break;
case APValue::Int:
Out << V.getInt();
break;
case APValue::Float:
Out << GetApproxValue(V.getFloat());
break;
case APValue::Vector:
Out << '[';
WriteShortAPValueToStream(Out, V.getVectorElt(0));
for (unsigned i = 1; i != V.getVectorLength(); ++i) {
Out << ", ";
WriteShortAPValueToStream(Out, V.getVectorElt(i));
}
Out << ']';
break;
case APValue::ComplexInt:
Out << V.getComplexIntReal() << "+" << V.getComplexIntImag() << "i";
break;
case APValue::ComplexFloat:
Out << GetApproxValue(V.getComplexFloatReal()) << "+"
<< GetApproxValue(V.getComplexFloatImag()) << "i";
break;
case APValue::LValue:
Out << "LValue: <todo>";
break;
}
}
const DiagnosticBuilder &clang::operator<<(const DiagnosticBuilder &DB,
const APValue &V) {
llvm::SmallString<64> Buffer;
llvm::raw_svector_ostream Out(Buffer);
WriteShortAPValueToStream(Out, V);
return DB << Out.str();
}
const Expr* APValue::getLValueBase() const {
assert(isLValue() && "Invalid accessor");
return ((const LV*)(const void*)Data)->Base;
}
CharUnits APValue::getLValueOffset() const {
assert(isLValue() && "Invalid accessor");
return ((const LV*)(const void*)Data)->Offset;
}
void APValue::setLValue(const Expr *B, const CharUnits &O) {
assert(isLValue() && "Invalid accessor");
((LV*)(char*)Data)->Base = B;
((LV*)(char*)Data)->Offset = O;
}
void APValue::MakeLValue() {
assert(isUninit() && "Bad state change");
new ((void*)(char*)Data) LV();
Kind = LValue;
}
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