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TypeErasedDataflowAnalysisTest.cpp
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TypeErasedDataflowAnalysisTest.cpp
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//===- unittests/Analysis/FlowSensitive/TypeErasedDataflowAnalysisTest.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 "TestingSupport.h"
#include "clang/AST/Decl.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/Type.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Analysis/CFG.h"
#include "clang/Analysis/FlowSensitive/DataflowAnalysis.h"
#include "clang/Analysis/FlowSensitive/DataflowAnalysisContext.h"
#include "clang/Analysis/FlowSensitive/DataflowEnvironment.h"
#include "clang/Analysis/FlowSensitive/DataflowLattice.h"
#include "clang/Analysis/FlowSensitive/DebugSupport.h"
#include "clang/Analysis/FlowSensitive/NoopAnalysis.h"
#include "clang/Analysis/FlowSensitive/Value.h"
#include "clang/Analysis/FlowSensitive/WatchedLiteralsSolver.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Error.h"
#include "llvm/Testing/ADT/StringMapEntry.h"
#include "llvm/Testing/Support/Error.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include <cassert>
#include <memory>
#include <optional>
#include <ostream>
#include <string>
#include <utility>
#include <vector>
namespace {
using namespace clang;
using namespace dataflow;
using namespace test;
using namespace ast_matchers;
using llvm::IsStringMapEntry;
using ::testing::DescribeMatcher;
using ::testing::IsEmpty;
using ::testing::NotNull;
using ::testing::Test;
using ::testing::UnorderedElementsAre;
template <typename AnalysisT>
llvm::Expected<std::vector<
std::optional<DataflowAnalysisState<typename AnalysisT::Lattice>>>>
runAnalysis(llvm::StringRef Code, AnalysisT (*MakeAnalysis)(ASTContext &)) {
std::unique_ptr<ASTUnit> AST =
tooling::buildASTFromCodeWithArgs(Code, {"-std=c++11"});
auto *Func = selectFirst<FunctionDecl>(
"func", match(functionDecl(ast_matchers::hasName("target")).bind("func"),
AST->getASTContext()));
assert(Func != nullptr);
Stmt *Body = Func->getBody();
assert(Body != nullptr);
auto CFCtx =
llvm::cantFail(ControlFlowContext::build(*Func, AST->getASTContext()));
AnalysisT Analysis = MakeAnalysis(AST->getASTContext());
DataflowAnalysisContext DACtx(std::make_unique<WatchedLiteralsSolver>());
Environment Env(DACtx);
return runDataflowAnalysis(CFCtx, Analysis, Env);
}
TEST(DataflowAnalysisTest, NoopAnalysis) {
auto BlockStates = llvm::cantFail(
runAnalysis<NoopAnalysis>("void target() {}", [](ASTContext &C) {
return NoopAnalysis(C, false);
}));
EXPECT_EQ(BlockStates.size(), 2u);
EXPECT_TRUE(BlockStates[0].has_value());
EXPECT_TRUE(BlockStates[1].has_value());
}
struct NonConvergingLattice {
int State;
bool operator==(const NonConvergingLattice &Other) const {
return State == Other.State;
}
LatticeJoinEffect join(const NonConvergingLattice &Other) {
if (Other.State == 0)
return LatticeJoinEffect::Unchanged;
State += Other.State;
return LatticeJoinEffect::Changed;
}
};
class NonConvergingAnalysis
: public DataflowAnalysis<NonConvergingAnalysis, NonConvergingLattice> {
public:
explicit NonConvergingAnalysis(ASTContext &Context)
: DataflowAnalysis<NonConvergingAnalysis, NonConvergingLattice>(
Context,
/*ApplyBuiltinTransfer=*/false) {}
static NonConvergingLattice initialElement() { return {0}; }
void transfer(const CFGElement &, NonConvergingLattice &E, Environment &) {
++E.State;
}
};
TEST(DataflowAnalysisTest, NonConvergingAnalysis) {
std::string Code = R"(
void target() {
while(true) {}
}
)";
auto Res = runAnalysis<NonConvergingAnalysis>(
Code, [](ASTContext &C) { return NonConvergingAnalysis(C); });
EXPECT_EQ(llvm::toString(Res.takeError()),
"maximum number of iterations reached");
}
// Regression test for joins of bool-typed lvalue expressions. The first loop
// results in two passes through the code that follows. Each pass results in a
// different `ReferenceValue` for the pointee of `v`. Then, the second loop
// causes a join at the loop head where the two environments map expresssion
// `*v` to different `ReferenceValue`s.
//
// An earlier version crashed for this condition (for boolean-typed lvalues), so
// this test only verifies that the analysis runs successfully, without
// examining any details of the results.
TEST(DataflowAnalysisTest, JoinBoolLValues) {
std::string Code = R"(
void target() {
for (int x = 1; x; x = 0)
(void)x;
bool *v;
if (*v)
for (int x = 1; x; x = 0)
(void)x;
}
)";
ASSERT_THAT_ERROR(
runAnalysis<NoopAnalysis>(Code,
[](ASTContext &C) {
auto EnableBuiltIns = DataflowAnalysisOptions{
DataflowAnalysisContext::Options{}};
return NoopAnalysis(C, EnableBuiltIns);
})
.takeError(),
llvm::Succeeded());
}
struct FunctionCallLattice {
using FunctionSet = llvm::SmallSet<std::string, 8>;
FunctionSet CalledFunctions;
bool operator==(const FunctionCallLattice &Other) const {
return CalledFunctions == Other.CalledFunctions;
}
LatticeJoinEffect join(const FunctionCallLattice &Other) {
if (Other.CalledFunctions.empty())
return LatticeJoinEffect::Unchanged;
const size_t size_before = CalledFunctions.size();
CalledFunctions.insert(Other.CalledFunctions.begin(),
Other.CalledFunctions.end());
return CalledFunctions.size() == size_before ? LatticeJoinEffect::Unchanged
: LatticeJoinEffect::Changed;
}
};
std::ostream &operator<<(std::ostream &OS, const FunctionCallLattice &L) {
std::string S;
llvm::raw_string_ostream ROS(S);
llvm::interleaveComma(L.CalledFunctions, ROS);
return OS << "{" << S << "}";
}
class FunctionCallAnalysis
: public DataflowAnalysis<FunctionCallAnalysis, FunctionCallLattice> {
public:
explicit FunctionCallAnalysis(ASTContext &Context)
: DataflowAnalysis<FunctionCallAnalysis, FunctionCallLattice>(Context) {}
static FunctionCallLattice initialElement() { return {}; }
void transfer(const CFGElement &Elt, FunctionCallLattice &E, Environment &) {
auto CS = Elt.getAs<CFGStmt>();
if (!CS)
return;
const auto *S = CS->getStmt();
if (auto *C = dyn_cast<CallExpr>(S)) {
if (auto *F = dyn_cast<FunctionDecl>(C->getCalleeDecl())) {
E.CalledFunctions.insert(F->getNameInfo().getAsString());
}
}
}
};
class NoreturnDestructorTest : public Test {
protected:
template <typename Matcher>
void runDataflow(llvm::StringRef Code, Matcher Expectations) {
tooling::FileContentMappings FilesContents;
FilesContents.push_back(std::make_pair<std::string, std::string>(
"noreturn_destructor_test_defs.h", R"(
int foo();
class Fatal {
public:
~Fatal() __attribute__((noreturn));
int bar();
int baz();
};
class NonFatal {
public:
~NonFatal();
int bar();
};
)"));
ASSERT_THAT_ERROR(
test::checkDataflow<FunctionCallAnalysis>(
AnalysisInputs<FunctionCallAnalysis>(
Code, ast_matchers::hasName("target"),
[](ASTContext &C, Environment &) {
return FunctionCallAnalysis(C);
})
.withASTBuildArgs({"-fsyntax-only", "-std=c++17"})
.withASTBuildVirtualMappedFiles(std::move(FilesContents)),
/*VerifyResults=*/
[&Expectations](
const llvm::StringMap<
DataflowAnalysisState<FunctionCallLattice>> &Results,
const AnalysisOutputs &) {
EXPECT_THAT(Results, Expectations);
}),
llvm::Succeeded());
}
};
MATCHER_P(HoldsFunctionCallLattice, m,
((negation ? "doesn't hold" : "holds") +
llvm::StringRef(" a lattice element that ") +
DescribeMatcher<FunctionCallLattice>(m))
.str()) {
return ExplainMatchResult(m, arg.Lattice, result_listener);
}
MATCHER_P(HasCalledFunctions, m,
((negation ? "doesn't hold" : "holds") +
llvm::StringRef(" a set of called functions that ") +
DescribeMatcher<FunctionCallLattice::FunctionSet>(m))
.str()) {
return ExplainMatchResult(m, arg.CalledFunctions, result_listener);
}
TEST_F(NoreturnDestructorTest, ConditionalOperatorBothBranchesReturn) {
std::string Code = R"(
#include "noreturn_destructor_test_defs.h"
void target(bool b) {
int value = b ? foo() : NonFatal().bar();
(void)0;
// [[p]]
}
)";
runDataflow(Code, UnorderedElementsAre(IsStringMapEntry(
"p", HoldsFunctionCallLattice(HasCalledFunctions(
UnorderedElementsAre("foo", "bar"))))));
}
TEST_F(NoreturnDestructorTest, ConditionalOperatorLeftBranchReturns) {
std::string Code = R"(
#include "noreturn_destructor_test_defs.h"
void target(bool b) {
int value = b ? foo() : Fatal().bar();
(void)0;
// [[p]]
}
)";
runDataflow(Code, UnorderedElementsAre(IsStringMapEntry(
"p", HoldsFunctionCallLattice(HasCalledFunctions(
UnorderedElementsAre("foo"))))));
}
TEST_F(NoreturnDestructorTest,
ConditionalOperatorConstantCondition_LeftBranchReturns) {
std::string Code = R"(
#include "noreturn_destructor_test_defs.h"
void target() {
int value = true ? foo() : Fatal().bar();
(void)0;
// [[p]]
}
)";
runDataflow(Code, UnorderedElementsAre(IsStringMapEntry(
"p", HoldsFunctionCallLattice(HasCalledFunctions(
UnorderedElementsAre("foo"))))));
}
TEST_F(NoreturnDestructorTest, ConditionalOperatorRightBranchReturns) {
std::string Code = R"(
#include "noreturn_destructor_test_defs.h"
void target(bool b) {
int value = b ? Fatal().bar() : foo();
(void)0;
// [[p]]
}
)";
runDataflow(Code, UnorderedElementsAre(IsStringMapEntry(
"p", HoldsFunctionCallLattice(HasCalledFunctions(
UnorderedElementsAre("foo"))))));
}
TEST_F(NoreturnDestructorTest,
ConditionalOperatorConstantCondition_RightBranchReturns) {
std::string Code = R"(
#include "noreturn_destructor_test_defs.h"
void target() {
int value = false ? Fatal().bar() : foo();
(void)0;
// [[p]]
}
)";
runDataflow(Code, UnorderedElementsAre(IsStringMapEntry(
"p", HoldsFunctionCallLattice(HasCalledFunctions(
UnorderedElementsAre("foo"))))));
}
TEST_F(NoreturnDestructorTest, ConditionalOperatorNestedBranchesDoNotReturn) {
std::string Code = R"(
#include "noreturn_destructor_test_defs.h"
void target(bool b1, bool b2) {
int value = b1 ? foo() : (b2 ? Fatal().bar() : Fatal().baz());
(void)0;
// [[p]]
}
)";
runDataflow(Code, IsEmpty());
// FIXME: Called functions at point `p` should contain "foo".
}
TEST_F(NoreturnDestructorTest, ConditionalOperatorNestedBranchReturns) {
std::string Code = R"(
#include "noreturn_destructor_test_defs.h"
void target(bool b1, bool b2) {
int value = b1 ? Fatal().bar() : (b2 ? Fatal().baz() : foo());
(void)0;
// [[p]]
}
)";
runDataflow(Code, UnorderedElementsAre(IsStringMapEntry(
"p", HoldsFunctionCallLattice(HasCalledFunctions(
UnorderedElementsAre("baz", "foo"))))));
// FIXME: Called functions at point `p` should contain only "foo".
}
// Models an analysis that uses flow conditions.
class SpecialBoolAnalysis final
: public DataflowAnalysis<SpecialBoolAnalysis, NoopLattice> {
public:
explicit SpecialBoolAnalysis(ASTContext &Context)
: DataflowAnalysis<SpecialBoolAnalysis, NoopLattice>(Context) {}
static NoopLattice initialElement() { return {}; }
void transfer(const CFGElement &Elt, NoopLattice &, Environment &Env) {
auto CS = Elt.getAs<CFGStmt>();
if (!CS)
return;
const auto *S = CS->getStmt();
auto SpecialBoolRecordDecl = recordDecl(hasName("SpecialBool"));
auto HasSpecialBoolType = hasType(SpecialBoolRecordDecl);
if (const auto *E = selectFirst<CXXConstructExpr>(
"call", match(cxxConstructExpr(HasSpecialBoolType).bind("call"), *S,
getASTContext()))) {
auto &ConstructorVal = *Env.createValue(E->getType());
ConstructorVal.setProperty("is_set", Env.getBoolLiteralValue(false));
Env.setValue(*Env.getStorageLocation(*E, SkipPast::None), ConstructorVal);
} else if (const auto *E = selectFirst<CXXMemberCallExpr>(
"call", match(cxxMemberCallExpr(callee(cxxMethodDecl(ofClass(
SpecialBoolRecordDecl))))
.bind("call"),
*S, getASTContext()))) {
auto *Object = E->getImplicitObjectArgument();
assert(Object != nullptr);
auto *ObjectLoc = getImplicitObjectLocation(*E, Env);
assert(ObjectLoc != nullptr);
auto &ConstructorVal = *Env.createValue(Object->getType());
ConstructorVal.setProperty("is_set", Env.getBoolLiteralValue(true));
Env.setValue(*ObjectLoc, ConstructorVal);
}
}
ComparisonResult compare(QualType Type, const Value &Val1,
const Environment &Env1, const Value &Val2,
const Environment &Env2) override {
const auto *Decl = Type->getAsCXXRecordDecl();
if (Decl == nullptr || Decl->getIdentifier() == nullptr ||
Decl->getName() != "SpecialBool")
return ComparisonResult::Unknown;
auto *IsSet1 = cast_or_null<BoolValue>(Val1.getProperty("is_set"));
auto *IsSet2 = cast_or_null<BoolValue>(Val2.getProperty("is_set"));
if (IsSet1 == nullptr)
return IsSet2 == nullptr ? ComparisonResult::Same
: ComparisonResult::Different;
if (IsSet2 == nullptr)
return ComparisonResult::Different;
return Env1.flowConditionImplies(*IsSet1) ==
Env2.flowConditionImplies(*IsSet2)
? ComparisonResult::Same
: ComparisonResult::Different;
}
// Always returns `true` to accept the `MergedVal`.
bool merge(QualType Type, const Value &Val1, const Environment &Env1,
const Value &Val2, const Environment &Env2, Value &MergedVal,
Environment &MergedEnv) override {
const auto *Decl = Type->getAsCXXRecordDecl();
if (Decl == nullptr || Decl->getIdentifier() == nullptr ||
Decl->getName() != "SpecialBool")
return true;
auto *IsSet1 = cast_or_null<BoolValue>(Val1.getProperty("is_set"));
if (IsSet1 == nullptr)
return true;
auto *IsSet2 = cast_or_null<BoolValue>(Val2.getProperty("is_set"));
if (IsSet2 == nullptr)
return true;
auto &IsSet = MergedEnv.makeAtomicBoolValue();
MergedVal.setProperty("is_set", IsSet);
if (Env1.flowConditionImplies(*IsSet1) &&
Env2.flowConditionImplies(*IsSet2))
MergedEnv.addToFlowCondition(IsSet);
return true;
}
};
class JoinFlowConditionsTest : public Test {
protected:
template <typename Matcher>
void runDataflow(llvm::StringRef Code, Matcher Match) {
ASSERT_THAT_ERROR(
test::checkDataflow<SpecialBoolAnalysis>(
AnalysisInputs<SpecialBoolAnalysis>(
Code, ast_matchers::hasName("target"),
[](ASTContext &Context, Environment &Env) {
return SpecialBoolAnalysis(Context);
})
.withASTBuildArgs({"-fsyntax-only", "-std=c++17"}),
/*VerifyResults=*/[&Match](const llvm::StringMap<
DataflowAnalysisState<NoopLattice>>
&Results,
const AnalysisOutputs
&AO) { Match(Results, AO.ASTCtx); }),
llvm::Succeeded());
}
};
TEST_F(JoinFlowConditionsTest, JoinDistinctButProvablyEquivalentValues) {
std::string Code = R"(
struct SpecialBool {
SpecialBool() = default;
void set();
};
void target(bool Cond) {
SpecialBool Foo;
/*[[p1]]*/
if (Cond) {
Foo.set();
/*[[p2]]*/
} else {
Foo.set();
/*[[p3]]*/
}
(void)0;
/*[[p4]]*/
}
)";
runDataflow(
Code,
[](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
ASTContext &ASTCtx) {
ASSERT_THAT(Results.keys(),
UnorderedElementsAre("p1", "p2", "p3", "p4"));
const Environment &Env1 = getEnvironmentAtAnnotation(Results, "p1");
const Environment &Env2 = getEnvironmentAtAnnotation(Results, "p2");
const Environment &Env3 = getEnvironmentAtAnnotation(Results, "p3");
const Environment &Env4 = getEnvironmentAtAnnotation(Results, "p4");
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
auto GetFooValue = [FooDecl](const Environment &Env) {
return cast<BoolValue>(Env.getValue(*FooDecl)->getProperty("is_set"));
};
EXPECT_FALSE(Env1.flowConditionImplies(*GetFooValue(Env1)));
EXPECT_TRUE(Env2.flowConditionImplies(*GetFooValue(Env2)));
EXPECT_TRUE(Env3.flowConditionImplies(*GetFooValue(Env3)));
EXPECT_TRUE(Env4.flowConditionImplies(*GetFooValue(Env4)));
});
}
class OptionalIntAnalysis final
: public DataflowAnalysis<OptionalIntAnalysis, NoopLattice> {
public:
explicit OptionalIntAnalysis(ASTContext &Context)
: DataflowAnalysis<OptionalIntAnalysis, NoopLattice>(Context) {}
static NoopLattice initialElement() { return {}; }
void transfer(const CFGElement &Elt, NoopLattice &, Environment &Env) {
auto CS = Elt.getAs<CFGStmt>();
if (!CS)
return;
const Stmt *S = CS->getStmt();
auto OptionalIntRecordDecl = recordDecl(hasName("OptionalInt"));
auto HasOptionalIntType = hasType(OptionalIntRecordDecl);
SmallVector<BoundNodes, 1> Matches = match(
stmt(anyOf(cxxConstructExpr(HasOptionalIntType).bind("construct"),
cxxOperatorCallExpr(
callee(cxxMethodDecl(ofClass(OptionalIntRecordDecl))))
.bind("operator"))),
*S, getASTContext());
if (const auto *E = selectFirst<CXXConstructExpr>(
"construct", Matches)) {
auto &ConstructorVal = *Env.createValue(E->getType());
ConstructorVal.setProperty("has_value", Env.getBoolLiteralValue(false));
Env.setValue(*Env.getStorageLocation(*E, SkipPast::None), ConstructorVal);
} else if (const auto *E =
selectFirst<CXXOperatorCallExpr>("operator", Matches)) {
assert(E->getNumArgs() > 0);
auto *Object = E->getArg(0);
assert(Object != nullptr);
auto *ObjectLoc = Env.getStorageLocation(*Object, SkipPast::Reference);
assert(ObjectLoc != nullptr);
auto &ConstructorVal = *Env.createValue(Object->getType());
ConstructorVal.setProperty("has_value", Env.getBoolLiteralValue(true));
Env.setValue(*ObjectLoc, ConstructorVal);
}
}
ComparisonResult compare(QualType Type, const Value &Val1,
const Environment &Env1, const Value &Val2,
const Environment &Env2) override {
// Nothing to say about a value that does not model an `OptionalInt`.
if (!Type->isRecordType() ||
Type->getAsCXXRecordDecl()->getQualifiedNameAsString() != "OptionalInt")
return ComparisonResult::Unknown;
auto *Prop1 = Val1.getProperty("has_value");
auto *Prop2 = Val2.getProperty("has_value");
assert(Prop1 != nullptr && Prop2 != nullptr);
return areEquivalentValues(*Prop1, *Prop2) ? ComparisonResult::Same
: ComparisonResult::Different;
}
bool merge(QualType Type, const Value &Val1, const Environment &Env1,
const Value &Val2, const Environment &Env2, Value &MergedVal,
Environment &MergedEnv) override {
// Nothing to say about a value that does not model an `OptionalInt`.
if (!Type->isRecordType() ||
Type->getAsCXXRecordDecl()->getQualifiedNameAsString() != "OptionalInt")
return false;
auto *HasValue1 = cast_or_null<BoolValue>(Val1.getProperty("has_value"));
if (HasValue1 == nullptr)
return false;
auto *HasValue2 = cast_or_null<BoolValue>(Val2.getProperty("has_value"));
if (HasValue2 == nullptr)
return false;
if (HasValue1 == HasValue2)
MergedVal.setProperty("has_value", *HasValue1);
else
MergedVal.setProperty("has_value", MergedEnv.makeTopBoolValue());
return true;
}
};
class WideningTest : public Test {
protected:
template <typename Matcher>
void runDataflow(llvm::StringRef Code, Matcher Match) {
tooling::FileContentMappings FilesContents;
FilesContents.push_back(
std::make_pair<std::string, std::string>("widening_test_defs.h", R"(
struct OptionalInt {
OptionalInt() = default;
OptionalInt& operator=(int);
};
)"));
ASSERT_THAT_ERROR(
checkDataflow<OptionalIntAnalysis>(
AnalysisInputs<OptionalIntAnalysis>(
Code, ast_matchers::hasName("target"),
[](ASTContext &Context, Environment &Env) {
return OptionalIntAnalysis(Context);
})
.withASTBuildArgs({"-fsyntax-only", "-std=c++17"})
.withASTBuildVirtualMappedFiles(std::move(FilesContents)),
/*VerifyResults=*/[&Match](const llvm::StringMap<
DataflowAnalysisState<NoopLattice>>
&Results,
const AnalysisOutputs
&AO) { Match(Results, AO.ASTCtx); }),
llvm::Succeeded());
}
};
TEST_F(WideningTest, JoinDistinctValuesWithDistinctProperties) {
std::string Code = R"(
#include "widening_test_defs.h"
void target(bool Cond) {
OptionalInt Foo;
/*[[p1]]*/
if (Cond) {
Foo = 1;
/*[[p2]]*/
}
(void)0;
/*[[p3]]*/
}
)";
runDataflow(
Code,
[](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
ASTContext &ASTCtx) {
ASSERT_THAT(Results.keys(), UnorderedElementsAre("p1", "p2", "p3"));
const Environment &Env1 = getEnvironmentAtAnnotation(Results, "p1");
const Environment &Env2 = getEnvironmentAtAnnotation(Results, "p2");
const Environment &Env3 = getEnvironmentAtAnnotation(Results, "p3");
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
auto GetFooValue = [FooDecl](const Environment &Env) {
return Env.getValue(*FooDecl);
};
EXPECT_EQ(GetFooValue(Env1)->getProperty("has_value"),
&Env1.getBoolLiteralValue(false));
EXPECT_EQ(GetFooValue(Env2)->getProperty("has_value"),
&Env2.getBoolLiteralValue(true));
EXPECT_TRUE(
isa<TopBoolValue>(GetFooValue(Env3)->getProperty("has_value")));
});
}
TEST_F(WideningTest, JoinDistinctValuesWithSameProperties) {
std::string Code = R"(
#include "widening_test_defs.h"
void target(bool Cond) {
OptionalInt Foo;
/*[[p1]]*/
if (Cond) {
Foo = 1;
/*[[p2]]*/
} else {
Foo = 2;
/*[[p3]]*/
}
(void)0;
/*[[p4]]*/
}
)";
runDataflow(
Code,
[](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
ASTContext &ASTCtx) {
ASSERT_THAT(Results.keys(),
UnorderedElementsAre("p1", "p2", "p3", "p4"));
const Environment &Env1 = getEnvironmentAtAnnotation(Results, "p1");
const Environment &Env2 = getEnvironmentAtAnnotation(Results, "p2");
const Environment &Env3 = getEnvironmentAtAnnotation(Results, "p3");
const Environment &Env4 = getEnvironmentAtAnnotation(Results, "p4");
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
auto GetFooValue = [FooDecl](const Environment &Env) {
return Env.getValue(*FooDecl);
};
EXPECT_EQ(GetFooValue(Env1)->getProperty("has_value"),
&Env1.getBoolLiteralValue(false));
EXPECT_EQ(GetFooValue(Env2)->getProperty("has_value"),
&Env2.getBoolLiteralValue(true));
EXPECT_EQ(GetFooValue(Env3)->getProperty("has_value"),
&Env3.getBoolLiteralValue(true));
EXPECT_EQ(GetFooValue(Env4)->getProperty("has_value"),
&Env4.getBoolLiteralValue(true));
});
}
TEST_F(WideningTest, DistinctPointersToTheSameLocationAreEquivalent) {
std::string Code = R"(
void target(int Foo, bool Cond) {
int *Bar = &Foo;
while (Cond) {
Bar = &Foo;
}
(void)0;
// [[p]]
}
)";
runDataflow(
Code,
[](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
ASTContext &ASTCtx) {
ASSERT_THAT(Results.keys(), UnorderedElementsAre("p"));
const Environment &Env = getEnvironmentAtAnnotation(Results, "p");
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
const ValueDecl *BarDecl = findValueDecl(ASTCtx, "Bar");
ASSERT_THAT(BarDecl, NotNull());
const auto *FooLoc =
cast<ScalarStorageLocation>(Env.getStorageLocation(*FooDecl));
const auto *BarVal = cast<PointerValue>(Env.getValue(*BarDecl));
EXPECT_EQ(&BarVal->getPointeeLoc(), FooLoc);
});
}
TEST_F(WideningTest, DistinctValuesWithSamePropertiesAreEquivalent) {
std::string Code = R"(
#include "widening_test_defs.h"
void target(bool Cond) {
OptionalInt Foo;
Foo = 1;
while (Cond) {
Foo = 2;
}
(void)0;
/*[[p]]*/
}
)";
runDataflow(
Code,
[](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
ASTContext &ASTCtx) {
ASSERT_THAT(Results.keys(), UnorderedElementsAre("p"));
const Environment &Env = getEnvironmentAtAnnotation(Results, "p");
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
const auto *FooVal = Env.getValue(*FooDecl);
EXPECT_EQ(FooVal->getProperty("has_value"),
&Env.getBoolLiteralValue(true));
});
}
class FlowConditionTest : public Test {
protected:
template <typename Matcher>
void runDataflow(llvm::StringRef Code, Matcher Match) {
ASSERT_THAT_ERROR(
checkDataflow<NoopAnalysis>(
AnalysisInputs<NoopAnalysis>(
Code, ast_matchers::hasName("target"),
[](ASTContext &Context, Environment &Env) {
return NoopAnalysis(Context, true);
})
.withASTBuildArgs({"-fsyntax-only", "-std=c++17"}),
/*VerifyResults=*/[&Match](const llvm::StringMap<
DataflowAnalysisState<NoopLattice>>
&Results,
const AnalysisOutputs
&AO) { Match(Results, AO.ASTCtx); }),
llvm::Succeeded());
}
};
TEST_F(FlowConditionTest, IfStmtSingleVar) {
std::string Code = R"(
void target(bool Foo) {
if (Foo) {
(void)0;
/*[[p1]]*/
} else {
(void)1;
/*[[p2]]*/
}
}
)";
runDataflow(
Code,
[](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
ASTContext &ASTCtx) {
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
ASSERT_THAT(Results.keys(), UnorderedElementsAre("p1", "p2"));
const Environment &Env1 = getEnvironmentAtAnnotation(Results, "p1");
auto *FooVal1 = cast<BoolValue>(Env1.getValue(*FooDecl));
EXPECT_TRUE(Env1.flowConditionImplies(*FooVal1));
const Environment &Env2 = getEnvironmentAtAnnotation(Results, "p2");
auto *FooVal2 = cast<BoolValue>(Env2.getValue(*FooDecl));
EXPECT_FALSE(Env2.flowConditionImplies(*FooVal2));
});
}
TEST_F(FlowConditionTest, IfStmtSingleNegatedVar) {
std::string Code = R"(
void target(bool Foo) {
if (!Foo) {
(void)0;
/*[[p1]]*/
} else {
(void)1;
/*[[p2]]*/
}
}
)";
runDataflow(
Code,
[](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
ASTContext &ASTCtx) {
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
ASSERT_THAT(Results.keys(), UnorderedElementsAre("p1", "p2"));
const Environment &Env1 = getEnvironmentAtAnnotation(Results, "p1");
auto *FooVal1 = cast<BoolValue>(Env1.getValue(*FooDecl));
EXPECT_FALSE(Env1.flowConditionImplies(*FooVal1));
const Environment &Env2 = getEnvironmentAtAnnotation(Results, "p2");
auto *FooVal2 = cast<BoolValue>(Env2.getValue(*FooDecl));
EXPECT_TRUE(Env2.flowConditionImplies(*FooVal2));
});
}
TEST_F(FlowConditionTest, WhileStmt) {
std::string Code = R"(
void target(bool Foo) {
while (Foo) {
(void)0;
/*[[p]]*/
}
}
)";
runDataflow(
Code,
[](const llvm::StringMap<DataflowAnalysisState<NoopLattice>> &Results,
ASTContext &ASTCtx) {
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
ASSERT_THAT(Results.keys(), UnorderedElementsAre("p"));
const Environment &Env = getEnvironmentAtAnnotation(Results, "p");
auto *FooVal = cast<BoolValue>(Env.getValue(*FooDecl));
EXPECT_TRUE(Env.flowConditionImplies(*FooVal));
});
}
TEST_F(FlowConditionTest, Conjunction) {
std::string Code = R"(
void target(bool Foo, bool Bar) {
if (Foo && Bar) {
(void)0;
/*[[p1]]*/
} else {
(void)1;
/*[[p2]]*/
}
}
)";
runDataflow(Code, [](const llvm::StringMap<DataflowAnalysisState<NoopLattice>>
&Results,
ASTContext &ASTCtx) {
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
const ValueDecl *BarDecl = findValueDecl(ASTCtx, "Bar");
ASSERT_THAT(BarDecl, NotNull());
ASSERT_THAT(Results.keys(), UnorderedElementsAre("p1", "p2"));
const Environment &Env1 = getEnvironmentAtAnnotation(Results, "p1");
auto *FooVal1 = cast<BoolValue>(Env1.getValue(*FooDecl));
auto *BarVal1 = cast<BoolValue>(Env1.getValue(*BarDecl));
EXPECT_TRUE(Env1.flowConditionImplies(*FooVal1));
EXPECT_TRUE(Env1.flowConditionImplies(*BarVal1));
const Environment &Env2 = getEnvironmentAtAnnotation(Results, "p2");
auto *FooVal2 = cast<BoolValue>(Env2.getValue(*FooDecl));
auto *BarVal2 = cast<BoolValue>(Env2.getValue(*BarDecl));
EXPECT_FALSE(Env2.flowConditionImplies(*FooVal2));
EXPECT_FALSE(Env2.flowConditionImplies(*BarVal2));
});
}
TEST_F(FlowConditionTest, Disjunction) {
std::string Code = R"(
void target(bool Foo, bool Bar) {
if (Foo || Bar) {
(void)0;
/*[[p1]]*/
} else {
(void)1;
/*[[p2]]*/
}
}
)";
runDataflow(Code, [](const llvm::StringMap<DataflowAnalysisState<NoopLattice>>
&Results,
ASTContext &ASTCtx) {
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
const ValueDecl *BarDecl = findValueDecl(ASTCtx, "Bar");
ASSERT_THAT(BarDecl, NotNull());
ASSERT_THAT(Results.keys(), UnorderedElementsAre("p1", "p2"));
const Environment &Env1 = getEnvironmentAtAnnotation(Results, "p1");
auto *FooVal1 = cast<BoolValue>(Env1.getValue(*FooDecl));
auto *BarVal1 = cast<BoolValue>(Env1.getValue(*BarDecl));
EXPECT_FALSE(Env1.flowConditionImplies(*FooVal1));
EXPECT_FALSE(Env1.flowConditionImplies(*BarVal1));
const Environment &Env2 = getEnvironmentAtAnnotation(Results, "p2");
auto *FooVal2 = cast<BoolValue>(Env2.getValue(*FooDecl));
auto *BarVal2 = cast<BoolValue>(Env2.getValue(*BarDecl));
EXPECT_FALSE(Env2.flowConditionImplies(*FooVal2));
EXPECT_FALSE(Env2.flowConditionImplies(*BarVal2));
});
}
TEST_F(FlowConditionTest, NegatedConjunction) {
std::string Code = R"(
void target(bool Foo, bool Bar) {
if (!(Foo && Bar)) {
(void)0;
/*[[p1]]*/
} else {
(void)1;
/*[[p2]]*/
}
}
)";
runDataflow(Code, [](const llvm::StringMap<DataflowAnalysisState<NoopLattice>>
&Results,
ASTContext &ASTCtx) {
const ValueDecl *FooDecl = findValueDecl(ASTCtx, "Foo");
ASSERT_THAT(FooDecl, NotNull());
const ValueDecl *BarDecl = findValueDecl(ASTCtx, "Bar");
ASSERT_THAT(BarDecl, NotNull());
ASSERT_THAT(Results.keys(), UnorderedElementsAre("p1", "p2"));
const Environment &Env1 = getEnvironmentAtAnnotation(Results, "p1");
auto *FooVal1 = cast<BoolValue>(Env1.getValue(*FooDecl));
auto *BarVal1 = cast<BoolValue>(Env1.getValue(*BarDecl));
EXPECT_FALSE(Env1.flowConditionImplies(*FooVal1));
EXPECT_FALSE(Env1.flowConditionImplies(*BarVal1));