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// ValueManager.h - Low-level value management for Value Tracking -*- C++ -*--==
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This files defines ValueManager, a class that manages the lifetime of APSInt
// objects and symbolic constraints used by GRExprEngine and related classes.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/PathSensitive/ValueManager.h"
using namespace clang;
ValueManager::~ValueManager() {
// Note that the dstor for the contents of APSIntSet will never be called,
// so we iterate over the set and invoke the dstor for each APSInt. This
// frees an aux. memory allocated to represent very large constants.
for (APSIntSetTy::iterator I=APSIntSet.begin(), E=APSIntSet.end(); I!=E; ++I)
I->getValue().~APSInt();
}
const llvm::APSInt& ValueManager::getValue(const llvm::APSInt& X) {
llvm::FoldingSetNodeID ID;
void* InsertPos;
typedef llvm::FoldingSetNodeWrapper<llvm::APSInt> FoldNodeTy;
X.Profile(ID);
FoldNodeTy* P = APSIntSet.FindNodeOrInsertPos(ID, InsertPos);
if (!P) {
P = (FoldNodeTy*) BPAlloc.Allocate<FoldNodeTy>();
new (P) FoldNodeTy(X);
APSIntSet.InsertNode(P, InsertPos);
}
return *P;
}
const llvm::APSInt& ValueManager::getValue(uint64_t X, unsigned BitWidth,
bool isUnsigned) {
llvm::APSInt V(BitWidth, isUnsigned);
V = X;
return getValue(V);
}
const llvm::APSInt& ValueManager::getValue(uint64_t X, QualType T,
SourceLocation Loc) {
unsigned bits = Ctx.getTypeSize(T, Loc);
llvm::APSInt V(bits, T->isUnsignedIntegerType());
V = X;
return getValue(V);
}
const SymIntConstraint&
ValueManager::getConstraint(SymbolID sym, BinaryOperator::Opcode Op,
const llvm::APSInt& V) {
llvm::FoldingSetNodeID ID;
SymIntConstraint::Profile(ID, sym, Op, V);
void* InsertPos;
SymIntConstraint* C = SymIntCSet.FindNodeOrInsertPos(ID, InsertPos);
if (!C) {
C = (SymIntConstraint*) BPAlloc.Allocate<SymIntConstraint>();
new (C) SymIntConstraint(sym, Op, V);
SymIntCSet.InsertNode(C, InsertPos);
}
return *C;
}
const llvm::APSInt&
ValueManager::EvaluateAPSInt(BinaryOperator::Opcode Op,
const llvm::APSInt& V1, const llvm::APSInt& V2) {
switch (Op) {
default:
assert (false && "Invalid Opcode.");
case BinaryOperator::Mul:
return getValue( V1 * V2 );
case BinaryOperator::Div:
return getValue( V1 / V2 );
case BinaryOperator::Rem:
return getValue( V1 % V2 );
case BinaryOperator::Add:
return getValue( V1 + V2 );
case BinaryOperator::Sub:
return getValue( V1 - V2 );
case BinaryOperator::Shl:
return getValue( V1.operator<<( (unsigned) V2.getZExtValue() ));
case BinaryOperator::Shr:
return getValue( V1.operator>>( (unsigned) V2.getZExtValue() ));
case BinaryOperator::LT:
return getTruthValue( V1 < V2 );
case BinaryOperator::GT:
return getTruthValue( V1 > V2 );
case BinaryOperator::LE:
return getTruthValue( V1 <= V2 );
case BinaryOperator::GE:
return getTruthValue( V1 >= V2 );
case BinaryOperator::EQ:
return getTruthValue( V1 == V2 );
case BinaryOperator::NE:
return getTruthValue( V1 != V2 );
// Note: LAnd, LOr, Comma are handled specially by higher-level logic.
case BinaryOperator::And:
return getValue( V1 & V2 );
case BinaryOperator::Or:
return getValue( V1 | V2 );
case BinaryOperator::Xor:
return getValue( V1 ^ V2 );