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//===-- ExecutorUtil.cpp --------------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Executor.h"
#include "klee/Expr.h"
#include "klee/Interpreter.h"
#include "klee/Machine.h"
#include "klee/Solver.h"
#include "klee/Internal/Module/KModule.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/Module.h"
#include "llvm/ModuleProvider.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/Streams.h"
#include "llvm/Target/TargetData.h"
#include <iostream>
#include <cassert>
using namespace klee;
using namespace llvm;
namespace klee {
ref<Expr>
Executor::evalConstantExpr(llvm::ConstantExpr *ce) {
const llvm::Type *type = ce->getType();
ref<Expr> op1(0), op2(0), op3(0);
int numOperands = ce->getNumOperands();
if (numOperands > 0) op1 = evalConstant(ce->getOperand(0));
if (numOperands > 1) op2 = evalConstant(ce->getOperand(1));
if (numOperands > 2) op3 = evalConstant(ce->getOperand(2));
switch (ce->getOpcode()) {
case Instruction::Trunc: return ExtractExpr::createByteOff(op1,
0,
Expr::getWidthForLLVMType(type));
case Instruction::ZExt: return ZExtExpr::create(op1,
Expr::getWidthForLLVMType(type));
case Instruction::SExt: return SExtExpr::create(op1,
Expr::getWidthForLLVMType(type));
case Instruction::Add: return AddExpr::create(op1, op2);
case Instruction::Sub: return SubExpr::create(op1, op2);
case Instruction::Mul: return MulExpr::create(op1, op2);
case Instruction::SDiv: return SDivExpr::create(op1, op2);
case Instruction::UDiv: return UDivExpr::create(op1, op2);
case Instruction::SRem: return SRemExpr::create(op1, op2);
case Instruction::URem: return URemExpr::create(op1, op2);
case Instruction::And: return AndExpr::create(op1, op2);
case Instruction::Or: return OrExpr::create(op1, op2);
case Instruction::Xor: return XorExpr::create(op1, op2);
case Instruction::Shl: return ShlExpr::create(op1, op2);
case Instruction::LShr: return LShrExpr::create(op1, op2);
case Instruction::AShr: return AShrExpr::create(op1, op2);
case Instruction::BitCast: return op1;
case Instruction::IntToPtr: {
return ZExtExpr::create(op1, Expr::getWidthForLLVMType(type));
}
case Instruction::PtrToInt: {
return ZExtExpr::create(op1, Expr::getWidthForLLVMType(type));
}
case Instruction::GetElementPtr: {
ref<Expr> base = op1;
for (gep_type_iterator ii = gep_type_begin(ce), ie = gep_type_end(ce);
ii != ie; ++ii) {
ref<Expr> addend = ConstantExpr::alloc(0, kMachinePointerType);
if (const StructType *st = dyn_cast<StructType>(*ii)) {
const StructLayout *sl = kmodule->targetData->getStructLayout(st);
const ConstantInt *ci = cast<ConstantInt>(ii.getOperand());
addend = Expr::createPointer(sl->getElementOffset((unsigned)
ci->getZExtValue()));
} else {
const SequentialType *st = cast<SequentialType>(*ii);
ref<Expr> index = evalConstant(cast<Constant>(ii.getOperand()));
unsigned elementSize = kmodule->targetData->getTypeStoreSize(st->getElementType());
index = Expr::createCoerceToPointerType(index);
addend = MulExpr::create(index,
Expr::createPointer(elementSize));
}
base = AddExpr::create(base, addend);
}
return base;
}
case Instruction::ICmp: {
switch(ce->getPredicate()) {
case ICmpInst::ICMP_EQ: return EqExpr::create(op1, op2);
case ICmpInst::ICMP_NE: return NeExpr::create(op1, op2);
case ICmpInst::ICMP_UGT: return UgtExpr::create(op1, op2);
case ICmpInst::ICMP_UGE: return UgeExpr::create(op1, op2);
case ICmpInst::ICMP_ULT: return UltExpr::create(op1, op2);
case ICmpInst::ICMP_ULE: return UleExpr::create(op1, op2);
case ICmpInst::ICMP_SGT: return SgtExpr::create(op1, op2);
case ICmpInst::ICMP_SGE: return SgeExpr::create(op1, op2);
case ICmpInst::ICMP_SLT: return SltExpr::create(op1, op2);
case ICmpInst::ICMP_SLE: return SleExpr::create(op1, op2);
default:
assert(0 && "unhandled ICmp predicate");
}
}
case Instruction::Select: {
return SelectExpr::create(op1, op2, op3);
}
case Instruction::FDiv:
case Instruction::FRem:
case Instruction::FPTrunc:
case Instruction::FPExt:
case Instruction::UIToFP:
case Instruction::SIToFP:
case Instruction::FPToUI:
case Instruction::FPToSI:
case Instruction::FCmp:
assert(0 && "floating point ConstantExprs unsupported");
default :
assert(0 && "unknown ConstantExpr type");
}
}
}
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