StoreTest.cpp
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//===- unittests/StaticAnalyzer/StoreTest.cpp -----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "Reusables.h"
#include "clang/Tooling/Tooling.h"
#include "gtest/gtest.h"
namespace clang {
namespace ento {
namespace {
// Test that we can put a value into an int-type variable and load it
// back from that variable. Test what happens if default bindings are used.
class VariableBindConsumer : public ExprEngineConsumer {
void performTest(const Decl *D) {
StoreManager &StMgr = Eng.getStoreManager();
SValBuilder &SVB = Eng.getSValBuilder();
MemRegionManager &MRMgr = StMgr.getRegionManager();
const ASTContext &ACtx = Eng.getContext();
const auto *VDX0 = findDeclByName<VarDecl>(D, "x0");
const auto *VDY0 = findDeclByName<VarDecl>(D, "y0");
const auto *VDZ0 = findDeclByName<VarDecl>(D, "z0");
const auto *VDX1 = findDeclByName<VarDecl>(D, "x1");
const auto *VDY1 = findDeclByName<VarDecl>(D, "y1");
assert(VDX0 && VDY0 && VDZ0 && VDX1 && VDY1);
const StackFrameContext *SFC =
Eng.getAnalysisDeclContextManager().getStackFrame(D);
Loc LX0 = loc::MemRegionVal(MRMgr.getVarRegion(VDX0, SFC));
Loc LY0 = loc::MemRegionVal(MRMgr.getVarRegion(VDY0, SFC));
Loc LZ0 = loc::MemRegionVal(MRMgr.getVarRegion(VDZ0, SFC));
Loc LX1 = loc::MemRegionVal(MRMgr.getVarRegion(VDX1, SFC));
Loc LY1 = loc::MemRegionVal(MRMgr.getVarRegion(VDY1, SFC));
Store StInit = StMgr.getInitialStore(SFC).getStore();
SVal Zero = SVB.makeZeroVal(ACtx.IntTy);
SVal One = SVB.makeIntVal(1, ACtx.IntTy);
SVal NarrowZero = SVB.makeZeroVal(ACtx.CharTy);
// Bind(Zero)
Store StX0 =
StMgr.Bind(StInit, LX0, Zero).getStore();
ASSERT_EQ(Zero, StMgr.getBinding(StX0, LX0, ACtx.IntTy));
// BindDefaultInitial(Zero)
Store StY0 =
StMgr.BindDefaultInitial(StInit, LY0.getAsRegion(), Zero).getStore();
ASSERT_EQ(Zero, StMgr.getBinding(StY0, LY0, ACtx.IntTy));
ASSERT_EQ(Zero, *StMgr.getDefaultBinding(StY0, LY0.getAsRegion()));
// BindDefaultZero()
Store StZ0 =
StMgr.BindDefaultZero(StInit, LZ0.getAsRegion()).getStore();
// BindDefaultZero wipes the region with '0 S8b', not with out Zero.
// Direct load, however, does give us back the object of the type
// that we specify for loading.
ASSERT_EQ(Zero, StMgr.getBinding(StZ0, LZ0, ACtx.IntTy));
ASSERT_EQ(NarrowZero, *StMgr.getDefaultBinding(StZ0, LZ0.getAsRegion()));
// Bind(One)
Store StX1 =
StMgr.Bind(StInit, LX1, One).getStore();
ASSERT_EQ(One, StMgr.getBinding(StX1, LX1, ACtx.IntTy));
// BindDefaultInitial(One)
Store StY1 =
StMgr.BindDefaultInitial(StInit, LY1.getAsRegion(), One).getStore();
ASSERT_EQ(One, StMgr.getBinding(StY1, LY1, ACtx.IntTy));
ASSERT_EQ(One, *StMgr.getDefaultBinding(StY1, LY1.getAsRegion()));
}
public:
VariableBindConsumer(CompilerInstance &C) : ExprEngineConsumer(C) {}
bool HandleTopLevelDecl(DeclGroupRef DG) override {
for (const auto *D : DG)
performTest(D);
return true;
}
};
class VariableBindAction : public ASTFrontendAction {
public:
std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &Compiler,
StringRef File) override {
return std::make_unique<VariableBindConsumer>(Compiler);
}
};
TEST(Store, VariableBind) {
EXPECT_TRUE(tooling::runToolOnCode(std::make_unique<VariableBindAction>(),
"void foo() { int x0, y0, z0, x1, y1; }"));
}
} // namespace
} // namespace ento
} // namespace clang