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//===-- ExprTest.cpp ------------------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "gtest/gtest.h"
#include "klee/Expr/ArrayCache.h"
#include "klee/Expr/ArrayExprOptimizer.h"
#include "klee/Expr/Assignment.h"
#include "klee/Expr/Expr.h"
#include <llvm/Support/CommandLine.h>
#include <iostream>
using namespace klee;
namespace klee {
extern llvm::cl::opt<ArrayOptimizationType> OptimizeArray;
}
namespace {
ref<Expr> getConstant(int value, Expr::Width width) {
int64_t ext = value;
uint64_t trunc = ext & (((uint64_t)-1LL) >> (64 - width));
return ConstantExpr::create(trunc, width);
}
static ArrayCache ac;
TEST(ArrayExprTest, HashCollisions) {
klee::OptimizeArray = ALL;
std::vector<ref<ConstantExpr>> constVals(256,
ConstantExpr::create(5, Expr::Int8));
const Array *array = ac.CreateArray("arr0", 256, constVals.data(),
constVals.data() + constVals.size(),
Expr::Int32, Expr::Int8);
const Array *symArray = ac.CreateArray("symIdx", 4);
ref<Expr> symIdx = Expr::createTempRead(symArray, Expr::Int32);
UpdateList ul(array, 0);
ul.extend(getConstant(3, Expr::Int32), getConstant(11, Expr::Int8));
ref<Expr> firstRead = ReadExpr::create(ul, symIdx);
ul.extend(getConstant(6, Expr::Int32), getConstant(42, Expr::Int8));
ul.extend(getConstant(6, Expr::Int32), getConstant(42, Expr::Int8));
ref<Expr> updatedRead = ReadExpr::create(ul, symIdx);
// This test requires hash collision and should be updated if the hash
// function changes
ASSERT_NE(updatedRead, firstRead);
ASSERT_EQ(updatedRead->hash(), firstRead->hash());
std::vector<unsigned char> value = {6, 0, 0, 0};
std::vector<std::vector<unsigned char>> values = {value};
std::vector<const Array *> assignmentArrays = {symArray};
auto a = std::make_unique<Assignment>(assignmentArrays, values,
/*_allowFreeValues=*/true);
EXPECT_NE(a->evaluate(updatedRead), a->evaluate(firstRead));
EXPECT_EQ(a->evaluate(updatedRead), getConstant(42, Expr::Int8));
EXPECT_EQ(a->evaluate(firstRead), getConstant(5, Expr::Int8));
ExprOptimizer opt;
auto oFirstRead = opt.optimizeExpr(firstRead, true);
auto oUpdatedRead = opt.optimizeExpr(updatedRead, true);
EXPECT_NE(oFirstRead, firstRead);
EXPECT_NE(updatedRead, oUpdatedRead);
EXPECT_NE(a->evaluate(oUpdatedRead), a->evaluate(oFirstRead));
EXPECT_EQ(a->evaluate(oUpdatedRead), getConstant(42, Expr::Int8));
EXPECT_EQ(a->evaluate(oFirstRead), getConstant(5, Expr::Int8));
}
}
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