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//===- unittests/Analysis/FlowSensitive/DataflowEnvironmentTest.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 "clang/Analysis/FlowSensitive/DataflowEnvironment.h"
#include "TestingSupport.h"
#include "clang/AST/DeclCXX.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Analysis/FlowSensitive/DataflowAnalysisContext.h"
#include "clang/Analysis/FlowSensitive/NoopAnalysis.h"
#include "clang/Analysis/FlowSensitive/Value.h"
#include "clang/Analysis/FlowSensitive/WatchedLiteralsSolver.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include <memory>
namespace {
using namespace clang;
using namespace dataflow;
using ::testing::ElementsAre;
using ::testing::NotNull;
using ::testing::Pair;
class EnvironmentTest : public ::testing::Test {
protected:
EnvironmentTest() : DAContext(std::make_unique<WatchedLiteralsSolver>()) {}
DataflowAnalysisContext DAContext;
};
TEST_F(EnvironmentTest, FlowCondition) {
Environment Env(DAContext);
EXPECT_TRUE(Env.flowConditionImplies(Env.getBoolLiteralValue(true)));
EXPECT_FALSE(Env.flowConditionImplies(Env.getBoolLiteralValue(false)));
auto &X = Env.makeAtomicBoolValue();
EXPECT_FALSE(Env.flowConditionImplies(X));
Env.addToFlowCondition(X);
EXPECT_TRUE(Env.flowConditionImplies(X));
auto &NotX = Env.makeNot(X);
EXPECT_FALSE(Env.flowConditionImplies(NotX));
}
TEST_F(EnvironmentTest, CreateValueRecursiveType) {
using namespace ast_matchers;
std::string Code = R"cc(
struct Recursive {
bool X;
Recursive *R;
};
// Use both fields to force them to be created with `createValue`.
void Usage(Recursive R) { (void)R.X; (void)R.R; }
)cc";
auto Unit =
tooling::buildASTFromCodeWithArgs(Code, {"-fsyntax-only", "-std=c++11"});
auto &Context = Unit->getASTContext();
ASSERT_EQ(Context.getDiagnostics().getClient()->getNumErrors(), 0U);
auto Results =
match(qualType(hasDeclaration(recordDecl(
hasName("Recursive"),
has(fieldDecl(hasName("R")).bind("field-r")))))
.bind("target"),
Context);
const QualType *TyPtr = selectFirst<QualType>("target", Results);
ASSERT_THAT(TyPtr, NotNull());
QualType Ty = *TyPtr;
ASSERT_FALSE(Ty.isNull());
const FieldDecl *R = selectFirst<FieldDecl>("field-r", Results);
ASSERT_THAT(R, NotNull());
Results = match(functionDecl(hasName("Usage")).bind("fun"), Context);
const auto *Fun = selectFirst<FunctionDecl>("fun", Results);
ASSERT_THAT(Fun, NotNull());
// Verify that the struct and the field (`R`) with first appearance of the
// type is created successfully.
Environment Env(DAContext, *Fun);
Value *Val = Env.createValue(Ty);
ASSERT_NE(Val, nullptr);
StructValue *SVal = clang::dyn_cast<StructValue>(Val);
ASSERT_NE(SVal, nullptr);
Val = SVal->getChild(*R);
ASSERT_NE(Val, nullptr);
PointerValue *PV = clang::dyn_cast<PointerValue>(Val);
EXPECT_NE(PV, nullptr);
}
TEST_F(EnvironmentTest, InitGlobalVarsFun) {
using namespace ast_matchers;
std::string Code = R"cc(
int Global = 0;
int Target () { return Global; }
)cc";
auto Unit =
tooling::buildASTFromCodeWithArgs(Code, {"-fsyntax-only", "-std=c++11"});
auto &Context = Unit->getASTContext();
ASSERT_EQ(Context.getDiagnostics().getClient()->getNumErrors(), 0U);
auto Results =
match(decl(anyOf(varDecl(hasName("Global")).bind("global"),
functionDecl(hasName("Target")).bind("target"))),
Context);
const auto *Fun = selectFirst<FunctionDecl>("target", Results);
const auto *Var = selectFirst<VarDecl>("global", Results);
ASSERT_THAT(Fun, NotNull());
ASSERT_THAT(Var, NotNull());
// Verify the global variable is populated when we analyze `Target`.
Environment Env(DAContext, *Fun);
EXPECT_THAT(Env.getValue(*Var, SkipPast::None), NotNull());
}
TEST_F(EnvironmentTest, InitGlobalVarsFieldFun) {
using namespace ast_matchers;
std::string Code = R"cc(
struct S { int Bar; };
S Global = {0};
int Target () { return Global.Bar; }
)cc";
auto Unit =
tooling::buildASTFromCodeWithArgs(Code, {"-fsyntax-only", "-std=c++11"});
auto &Context = Unit->getASTContext();
ASSERT_EQ(Context.getDiagnostics().getClient()->getNumErrors(), 0U);
auto Results =
match(decl(anyOf(varDecl(hasName("Global")).bind("global"),
functionDecl(hasName("Target")).bind("target"))),
Context);
const auto *Fun = selectFirst<FunctionDecl>("target", Results);
const auto *GlobalDecl = selectFirst<VarDecl>("global", Results);
ASSERT_THAT(Fun, NotNull());
ASSERT_THAT(GlobalDecl, NotNull());
ASSERT_TRUE(GlobalDecl->getType()->isStructureType());
auto GlobalFields = GlobalDecl->getType()->getAsRecordDecl()->fields();
FieldDecl *BarDecl = nullptr;
for (FieldDecl *Field : GlobalFields) {
if (Field->getNameAsString() == "Bar") {
BarDecl = Field;
break;
}
FAIL() << "Unexpected field: " << Field->getNameAsString();
}
ASSERT_THAT(BarDecl, NotNull());
// Verify the global variable is populated when we analyze `Target`.
Environment Env(DAContext, *Fun);
const auto *GlobalLoc = cast<AggregateStorageLocation>(
Env.getStorageLocation(*GlobalDecl, SkipPast::None));
const auto *GlobalVal = cast<StructValue>(Env.getValue(*GlobalLoc));
const auto *BarVal = GlobalVal->getChild(*BarDecl);
ASSERT_THAT(BarVal, NotNull());
EXPECT_TRUE(isa<IntegerValue>(BarVal));
}
TEST_F(EnvironmentTest, InitGlobalVarsConstructor) {
using namespace ast_matchers;
std::string Code = R"cc(
int Global = 0;
struct Target {
Target() : Field(Global) {}
int Field;
};
)cc";
auto Unit =
tooling::buildASTFromCodeWithArgs(Code, {"-fsyntax-only", "-std=c++11"});
auto &Context = Unit->getASTContext();
ASSERT_EQ(Context.getDiagnostics().getClient()->getNumErrors(), 0U);
auto Results =
match(decl(anyOf(
varDecl(hasName("Global")).bind("global"),
cxxConstructorDecl(ofClass(hasName("Target"))).bind("target"))),
Context);
const auto *Ctor = selectFirst<CXXConstructorDecl>("target", Results);
const auto *Var = selectFirst<VarDecl>("global", Results);
ASSERT_TRUE(Ctor != nullptr);
ASSERT_THAT(Var, NotNull());
// Verify the global variable is populated when we analyze `Target`.
Environment Env(DAContext, *Ctor);
EXPECT_THAT(Env.getValue(*Var, SkipPast::None), NotNull());
}
} // namespace
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