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//===-- SolverTest.cpp ----------------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include <iostream>
#include "gtest/gtest.h"
#include "klee/CommandLine.h"
#include "klee/Constraints.h"
#include "klee/Expr.h"
#include "klee/Solver.h"
#include "klee/util/ArrayCache.h"
#include "llvm/ADT/StringExtras.h"
using namespace klee;
namespace {
const int g_constants[] = { -1, 1, 4, 17, 0 };
const Expr::Width g_types[] = { Expr::Bool,
Expr::Int8,
Expr::Int16,
Expr::Int32,
Expr::Int64 };
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);
}
// We have to have the cache globally scopped (and not in ``testOperation``)
// because the Solver (i.e. in STP's case the STPBuilder) holds on to pointers
// to allocated Arrays.
ArrayCache ac;
template<class T>
void testOperation(Solver &solver,
int value,
Expr::Width operandWidth,
Expr::Width resultWidth) {
std::vector<Expr::CreateArg> symbolicArgs;
for (unsigned i = 0; i < T::numKids; i++) {
if (!T::isValidKidWidth(i, operandWidth))
return;
unsigned size = Expr::getMinBytesForWidth(operandWidth);
static uint64_t id = 0;
const Array *array = ac.CreateArray("arr" + llvm::utostr(++id), size);
symbolicArgs.push_back(Expr::CreateArg(Expr::createTempRead(array,
operandWidth)));
}
if (T::needsResultType())
symbolicArgs.push_back(Expr::CreateArg(resultWidth));
ref<Expr> fullySymbolicExpr = Expr::createFromKind(T::kind, symbolicArgs);
// For each kid, replace the kid with a constant value and verify
// that the fully symbolic expression is equivalent to it when the
// replaced value is appropriated constrained.
for (unsigned kid = 0; kid < T::numKids; kid++) {
std::vector<Expr::CreateArg> partiallyConstantArgs(symbolicArgs);
partiallyConstantArgs[kid] = getConstant(value, operandWidth);
ref<Expr> expr =
NotOptimizedExpr::create(EqExpr::create(partiallyConstantArgs[kid].expr,
symbolicArgs[kid].expr));
ref<Expr> partiallyConstantExpr =
Expr::createFromKind(T::kind, partiallyConstantArgs);
ref<Expr> queryExpr = EqExpr::create(fullySymbolicExpr,
partiallyConstantExpr);
ConstraintManager constraints;
constraints.addConstraint(expr);
bool res;
bool success = solver.mustBeTrue(Query(constraints, queryExpr), res);
EXPECT_EQ(true, success) << "Constraint solving failed";
if (success) {
EXPECT_EQ(true, res) << "Evaluation failed!\n"
<< "query " << queryExpr
<< " with " << expr;
}
}
}
template<class T>
void testOpcode(Solver &solver, bool tryBool = true, bool tryZero = true,
unsigned maxWidth = 64) {
for (unsigned j=0; j<sizeof(g_types)/sizeof(g_types[0]); j++) {
Expr::Width type = g_types[j];
if (type > maxWidth) continue;
for (unsigned i=0; i<sizeof(g_constants)/sizeof(g_constants[0]); i++) {
int value = g_constants[i];
if (!tryZero && !value) continue;
if (type == Expr::Bool && !tryBool) continue;
if (!T::needsResultType()) {
testOperation<T>(solver, value, type, type);
continue;
}
for (unsigned k=0; k<sizeof(g_types)/sizeof(g_types[0]); k++) {
Expr::Width resultType = g_types[k];
// nasty hack to give only Trunc/ZExt/SExt the right types
if (T::kind == Expr::SExt || T::kind == Expr::ZExt) {
if (Expr::getMinBytesForWidth(type) >=
Expr::getMinBytesForWidth(resultType))
continue;
}
testOperation<T>(solver, value, type, resultType);
}
}
}
}
TEST(SolverTest, Evaluation) {
Solver *solver = klee::createCoreSolver(CoreSolverToUse);
solver = createCexCachingSolver(solver);
solver = createCachingSolver(solver);
solver = createIndependentSolver(solver);
testOpcode<SelectExpr>(*solver);
testOpcode<ZExtExpr>(*solver);
testOpcode<SExtExpr>(*solver);
testOpcode<AddExpr>(*solver);
testOpcode<SubExpr>(*solver);
testOpcode<MulExpr>(*solver, false, true, 8);
testOpcode<SDivExpr>(*solver, false, false, 8);
testOpcode<UDivExpr>(*solver, false, false, 8);
testOpcode<SRemExpr>(*solver, false, false, 8);
testOpcode<URemExpr>(*solver, false, false, 8);
testOpcode<ShlExpr>(*solver, false);
testOpcode<LShrExpr>(*solver, false);
testOpcode<AShrExpr>(*solver, false);
testOpcode<AndExpr>(*solver);
testOpcode<OrExpr>(*solver);
testOpcode<XorExpr>(*solver);
testOpcode<EqExpr>(*solver);
testOpcode<NeExpr>(*solver);
testOpcode<UltExpr>(*solver);
testOpcode<UleExpr>(*solver);
testOpcode<UgtExpr>(*solver);
testOpcode<UgeExpr>(*solver);
testOpcode<SltExpr>(*solver);
testOpcode<SleExpr>(*solver);
testOpcode<SgtExpr>(*solver);
testOpcode<SgeExpr>(*solver);
delete solver;
}
}
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