forked from OSchip/llvm-project
Add a new class to analyze whether an expression is mutated within a statement.
ExprMutationAnalyzer is a generally useful helper that can be used in different clang-tidy checks for checking whether a given expression is (potentially) mutated within a statement (typically the enclosing compound statement.) This is a more general and more powerful/accurate version of isOnlyUsedAsConst, which is used in ForRangeCopyCheck, UnnecessaryCopyInitialization. Patch by Shuai Wang llvm-svn: 334604
This commit is contained in:
Aaron Ballman
parent
f37bd01ddc
commit
0d78a90a7d
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@ -3,6 +3,7 @@ set(LLVM_LINK_COMPONENTS support)
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add_clang_library(clangTidyUtils
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ASTUtils.cpp
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DeclRefExprUtils.cpp
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ExprMutationAnalyzer.cpp
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ExprSequence.cpp
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FixItHintUtils.cpp
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HeaderFileExtensionsUtils.cpp
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@ -0,0 +1,261 @@
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//===---------- ExprMutationAnalyzer.cpp - clang-tidy ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "ExprMutationAnalyzer.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "llvm/ADT/STLExtras.h"
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namespace clang {
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namespace tidy {
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namespace utils {
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using namespace ast_matchers;
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namespace {
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AST_MATCHER_P(LambdaExpr, hasCaptureInit, const Expr *, E) {
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return llvm::is_contained(Node.capture_inits(), E);
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}
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AST_MATCHER_P(CXXForRangeStmt, hasRangeStmt,
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ast_matchers::internal::Matcher<DeclStmt>, InnerMatcher) {
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const DeclStmt *const Range = Node.getRangeStmt();
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return InnerMatcher.matches(*Range, Finder, Builder);
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}
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const ast_matchers::internal::VariadicDynCastAllOfMatcher<Stmt, CXXTypeidExpr>
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cxxTypeidExpr;
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AST_MATCHER(CXXTypeidExpr, isPotentiallyEvaluated) {
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return Node.isPotentiallyEvaluated();
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}
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const ast_matchers::internal::VariadicDynCastAllOfMatcher<Stmt, CXXNoexceptExpr>
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cxxNoexceptExpr;
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const ast_matchers::internal::VariadicDynCastAllOfMatcher<Stmt,
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GenericSelectionExpr>
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genericSelectionExpr;
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AST_MATCHER_P(GenericSelectionExpr, hasControllingExpr,
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ast_matchers::internal::Matcher<Expr>, InnerMatcher) {
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return InnerMatcher.matches(*Node.getControllingExpr(), Finder, Builder);
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}
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const auto nonConstReferenceType = [] {
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return referenceType(pointee(unless(isConstQualified())));
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};
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} // namespace
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const Stmt *ExprMutationAnalyzer::findMutation(const Expr *Exp) {
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const auto Memoized = Results.find(Exp);
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if (Memoized != Results.end())
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return Memoized->second;
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if (isUnevaluated(Exp))
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return Results[Exp] = nullptr;
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for (const auto &Finder : {&ExprMutationAnalyzer::findDirectMutation,
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&ExprMutationAnalyzer::findMemberMutation,
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&ExprMutationAnalyzer::findArrayElementMutation,
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&ExprMutationAnalyzer::findCastMutation,
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&ExprMutationAnalyzer::findRangeLoopMutation,
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&ExprMutationAnalyzer::findReferenceMutation}) {
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if (const Stmt *S = (this->*Finder)(Exp))
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return Results[Exp] = S;
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}
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return Results[Exp] = nullptr;
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}
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bool ExprMutationAnalyzer::isUnevaluated(const Expr *Exp) {
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return selectFirst<Expr>(
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"expr",
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match(
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findAll(
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expr(equalsNode(Exp),
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anyOf(
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// `Exp` is part of the underlying expression of
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// decltype/typeof if it has an ancestor of
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// typeLoc.
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hasAncestor(typeLoc(unless(
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hasAncestor(unaryExprOrTypeTraitExpr())))),
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hasAncestor(expr(anyOf(
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// `UnaryExprOrTypeTraitExpr` is unevaluated
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// unless it's sizeof on VLA.
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unaryExprOrTypeTraitExpr(unless(sizeOfExpr(
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hasArgumentOfType(variableArrayType())))),
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// `CXXTypeidExpr` is unevaluated unless it's
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// applied to an expression of glvalue of
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// polymorphic class type.
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cxxTypeidExpr(
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unless(isPotentiallyEvaluated())),
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// The controlling expression of
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// `GenericSelectionExpr` is unevaluated.
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genericSelectionExpr(hasControllingExpr(
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hasDescendant(equalsNode(Exp)))),
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cxxNoexceptExpr())))))
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.bind("expr")),
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*Stm, *Context)) != nullptr;
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}
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const Stmt *
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ExprMutationAnalyzer::findExprMutation(ArrayRef<BoundNodes> Matches) {
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for (const auto &Nodes : Matches) {
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if (const Stmt *S = findMutation(Nodes.getNodeAs<Expr>("expr")))
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return S;
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}
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return nullptr;
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}
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const Stmt *
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ExprMutationAnalyzer::findDeclMutation(ArrayRef<BoundNodes> Matches) {
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for (const auto &DeclNodes : Matches) {
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if (const Stmt *S = findDeclMutation(DeclNodes.getNodeAs<Decl>("decl")))
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return S;
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}
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return nullptr;
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}
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const Stmt *ExprMutationAnalyzer::findDeclMutation(const Decl *Dec) {
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const auto Refs = match(
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findAll(declRefExpr(to(equalsNode(Dec))).bind("expr")), *Stm, *Context);
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for (const auto &RefNodes : Refs) {
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const auto *E = RefNodes.getNodeAs<Expr>("expr");
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if (findMutation(E))
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return E;
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}
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return nullptr;
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}
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const Stmt *ExprMutationAnalyzer::findDirectMutation(const Expr *Exp) {
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// LHS of any assignment operators.
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const auto AsAssignmentLhs =
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binaryOperator(isAssignmentOperator(), hasLHS(equalsNode(Exp)));
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// Operand of increment/decrement operators.
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const auto AsIncDecOperand =
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unaryOperator(anyOf(hasOperatorName("++"), hasOperatorName("--")),
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hasUnaryOperand(equalsNode(Exp)));
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// Invoking non-const member function.
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const auto NonConstMethod = cxxMethodDecl(unless(isConst()));
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const auto AsNonConstThis =
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expr(anyOf(cxxMemberCallExpr(callee(NonConstMethod), on(equalsNode(Exp))),
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cxxOperatorCallExpr(callee(NonConstMethod),
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hasArgument(0, equalsNode(Exp)))));
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// Taking address of 'Exp'.
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// We're assuming 'Exp' is mutated as soon as its address is taken, though in
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// theory we can follow the pointer and see whether it escaped `Stm` or is
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// dereferenced and then mutated. This is left for future improvements.
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const auto AsAmpersandOperand =
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unaryOperator(hasOperatorName("&"),
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// A NoOp implicit cast is adding const.
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unless(hasParent(implicitCastExpr(hasCastKind(CK_NoOp)))),
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hasUnaryOperand(equalsNode(Exp)));
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const auto AsPointerFromArrayDecay =
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castExpr(hasCastKind(CK_ArrayToPointerDecay),
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unless(hasParent(arraySubscriptExpr())), has(equalsNode(Exp)));
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// Used as non-const-ref argument when calling a function.
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const auto NonConstRefParam = forEachArgumentWithParam(
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equalsNode(Exp), parmVarDecl(hasType(nonConstReferenceType())));
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const auto AsNonConstRefArg =
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anyOf(callExpr(NonConstRefParam), cxxConstructExpr(NonConstRefParam));
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// Captured by a lambda by reference.
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// If we're initializing a capture with 'Exp' directly then we're initializing
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// a reference capture.
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// For value captures there will be an ImplicitCastExpr <LValueToRValue>.
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const auto AsLambdaRefCaptureInit = lambdaExpr(hasCaptureInit(Exp));
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// Returned as non-const-ref.
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// If we're returning 'Exp' directly then it's returned as non-const-ref.
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// For returning by value there will be an ImplicitCastExpr <LValueToRValue>.
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// For returning by const-ref there will be an ImplicitCastExpr <NoOp> (for
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// adding const.)
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const auto AsNonConstRefReturn = returnStmt(hasReturnValue(equalsNode(Exp)));
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const auto Matches =
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match(findAll(stmt(anyOf(AsAssignmentLhs, AsIncDecOperand, AsNonConstThis,
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AsAmpersandOperand, AsPointerFromArrayDecay,
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AsNonConstRefArg, AsLambdaRefCaptureInit,
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AsNonConstRefReturn))
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.bind("stmt")),
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*Stm, *Context);
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return selectFirst<Stmt>("stmt", Matches);
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}
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const Stmt *ExprMutationAnalyzer::findMemberMutation(const Expr *Exp) {
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// Check whether any member of 'Exp' is mutated.
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const auto MemberExprs = match(
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findAll(memberExpr(hasObjectExpression(equalsNode(Exp))).bind("expr")),
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*Stm, *Context);
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return findExprMutation(MemberExprs);
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}
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const Stmt *ExprMutationAnalyzer::findArrayElementMutation(const Expr *Exp) {
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// Check whether any element of an array is mutated.
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const auto SubscriptExprs = match(
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findAll(arraySubscriptExpr(hasBase(ignoringImpCasts(equalsNode(Exp))))
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.bind("expr")),
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*Stm, *Context);
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return findExprMutation(SubscriptExprs);
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}
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const Stmt *ExprMutationAnalyzer::findCastMutation(const Expr *Exp) {
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// If 'Exp' is casted to any non-const reference type, check the castExpr.
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const auto Casts =
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match(findAll(castExpr(hasSourceExpression(equalsNode(Exp)),
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anyOf(explicitCastExpr(hasDestinationType(
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nonConstReferenceType())),
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implicitCastExpr(hasImplicitDestinationType(
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nonConstReferenceType()))))
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.bind("expr")),
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*Stm, *Context);
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return findExprMutation(Casts);
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}
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const Stmt *ExprMutationAnalyzer::findRangeLoopMutation(const Expr *Exp) {
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// If range for looping over 'Exp' with a non-const reference loop variable,
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// check all declRefExpr of the loop variable.
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const auto LoopVars =
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match(findAll(cxxForRangeStmt(
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hasLoopVariable(
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varDecl(hasType(nonConstReferenceType())).bind("decl")),
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hasRangeInit(equalsNode(Exp)))),
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*Stm, *Context);
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return findDeclMutation(LoopVars);
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}
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const Stmt *ExprMutationAnalyzer::findReferenceMutation(const Expr *Exp) {
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// If 'Exp' is bound to a non-const reference, check all declRefExpr to that.
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const auto Refs = match(
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stmt(forEachDescendant(
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varDecl(
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hasType(nonConstReferenceType()),
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hasInitializer(anyOf(equalsNode(Exp),
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conditionalOperator(anyOf(
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hasTrueExpression(equalsNode(Exp)),
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hasFalseExpression(equalsNode(Exp)))))),
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hasParent(declStmt().bind("stmt")),
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// Don't follow the reference in range statement, we've handled
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// that separately.
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unless(hasParent(declStmt(hasParent(
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cxxForRangeStmt(hasRangeStmt(equalsBoundNode("stmt"))))))))
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.bind("decl"))),
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*Stm, *Context);
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return findDeclMutation(Refs);
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}
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} // namespace utils
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} // namespace tidy
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} // namespace clang
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@ -0,0 +1,56 @@
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//===---------- ExprMutationAnalyzer.h - clang-tidy -----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_EXPRMUTATIONANALYZER_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_EXPRMUTATIONANALYZER_H
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#include <type_traits>
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#include "clang/AST/AST.h"
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#include "clang/ASTMatchers/ASTMatchers.h"
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#include "llvm/ADT/DenseMap.h"
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namespace clang {
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namespace tidy {
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namespace utils {
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/// Analyzes whether any mutative operations are applied to an expression within
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/// a given statement.
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class ExprMutationAnalyzer {
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public:
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ExprMutationAnalyzer(const Stmt *Stm, ASTContext *Context)
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: Stm(Stm), Context(Context) {}
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bool isMutated(const Decl *Dec) { return findDeclMutation(Dec) != nullptr; }
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bool isMutated(const Expr *Exp) { return findMutation(Exp) != nullptr; }
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const Stmt *findMutation(const Expr *Exp);
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private:
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bool isUnevaluated(const Expr *Exp);
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const Stmt *findExprMutation(ArrayRef<ast_matchers::BoundNodes> Matches);
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const Stmt *findDeclMutation(ArrayRef<ast_matchers::BoundNodes> Matches);
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const Stmt *findDeclMutation(const Decl *Dec);
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const Stmt *findDirectMutation(const Expr *Exp);
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const Stmt *findMemberMutation(const Expr *Exp);
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const Stmt *findArrayElementMutation(const Expr *Exp);
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const Stmt *findCastMutation(const Expr *Exp);
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const Stmt *findRangeLoopMutation(const Expr *Exp);
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const Stmt *findReferenceMutation(const Expr *Exp);
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const Stmt *const Stm;
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ASTContext *const Context;
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llvm::DenseMap<const Expr *, const Stmt *> Results;
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};
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} // namespace utils
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} // namespace tidy
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} // namespace clang
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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_EXPRMUTATIONANALYZER_H
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@ -9,6 +9,7 @@ include_directories(${CLANG_LINT_SOURCE_DIR})
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add_extra_unittest(ClangTidyTests
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ClangTidyDiagnosticConsumerTest.cpp
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ClangTidyOptionsTest.cpp
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ExprMutationAnalyzerTest.cpp
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IncludeInserterTest.cpp
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GoogleModuleTest.cpp
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LLVMModuleTest.cpp
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@ -0,0 +1,609 @@
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//===---------- ExprMutationAnalyzerTest.cpp - clang-tidy -----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "../clang-tidy/utils/ExprMutationAnalyzer.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/ASTMatchers/ASTMatchers.h"
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#include "clang/Tooling/Tooling.h"
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include <cctype>
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namespace clang {
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namespace tidy {
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namespace test {
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using namespace clang::ast_matchers;
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using ::testing::ElementsAre;
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using ::testing::IsEmpty;
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using ::testing::ResultOf;
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using ::testing::StartsWith;
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using ::testing::Values;
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namespace {
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using ExprMatcher = internal::Matcher<Expr>;
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using StmtMatcher = internal::Matcher<Stmt>;
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ExprMatcher declRefTo(StringRef Name) {
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return declRefExpr(to(namedDecl(hasName(Name))));
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}
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StmtMatcher withEnclosingCompound(ExprMatcher Matcher) {
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return expr(Matcher, hasAncestor(compoundStmt().bind("stmt"))).bind("expr");
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}
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bool isMutated(const SmallVectorImpl<BoundNodes> &Results, ASTUnit *AST) {
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const auto *const S = selectFirst<Stmt>("stmt", Results);
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const auto *const E = selectFirst<Expr>("expr", Results);
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return utils::ExprMutationAnalyzer(S, &AST->getASTContext()).isMutated(E);
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}
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SmallVector<std::string, 1>
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mutatedBy(const SmallVectorImpl<BoundNodes> &Results, ASTUnit *AST) {
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const auto *const S = selectFirst<Stmt>("stmt", Results);
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SmallVector<std::string, 1> Chain;
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utils::ExprMutationAnalyzer Analyzer(S, &AST->getASTContext());
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for (const auto *E = selectFirst<Expr>("expr", Results); E != nullptr;) {
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const Stmt *By = Analyzer.findMutation(E);
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std::string buffer;
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llvm::raw_string_ostream stream(buffer);
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By->printPretty(stream, nullptr, AST->getASTContext().getPrintingPolicy());
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Chain.push_back(StringRef(stream.str()).trim().str());
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E = dyn_cast<DeclRefExpr>(By);
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}
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return Chain;
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}
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std::string removeSpace(std::string s) {
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s.erase(std::remove_if(s.begin(), s.end(),
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[](char c) { return std::isspace(c); }),
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s.end());
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return s;
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}
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} // namespace
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TEST(ExprMutationAnalyzerTest, Trivial) {
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const auto AST = tooling::buildASTFromCode("void f() { int x; x; }");
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const auto Results =
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match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
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EXPECT_FALSE(isMutated(Results, AST.get()));
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}
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class AssignmentTest : public ::testing::TestWithParam<std::string> {};
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TEST_P(AssignmentTest, AssignmentModifies) {
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const std::string ModExpr = "x " + GetParam() + " 10";
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const auto AST =
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tooling::buildASTFromCode("void f() { int x; " + ModExpr + "; }");
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const auto Results =
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match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
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EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre(ModExpr));
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}
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INSTANTIATE_TEST_CASE_P(AllAssignmentOperators, AssignmentTest,
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Values("=", "+=", "-=", "*=", "/=", "%=", "&=", "|=",
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"^=", "<<=", ">>="), );
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class IncDecTest : public ::testing::TestWithParam<std::string> {};
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TEST_P(IncDecTest, IncDecModifies) {
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const std::string ModExpr = GetParam();
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const auto AST =
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tooling::buildASTFromCode("void f() { int x; " + ModExpr + "; }");
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const auto Results =
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match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
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EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre(ModExpr));
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}
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|
||||
INSTANTIATE_TEST_CASE_P(AllIncDecOperators, IncDecTest,
|
||||
Values("++x", "--x", "x++", "x--"), );
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, NonConstMemberFunc) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { struct Foo { void mf(); }; Foo x; x.mf(); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.mf()"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ConstMemberFunc) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { struct Foo { void mf() const; }; Foo x; x.mf(); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, NonConstOperator) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { struct Foo { Foo& operator=(int); }; Foo x; x = 10; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x = 10"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ConstOperator) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { struct Foo { int operator()() const; }; Foo x; x(); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ByValueArgument) {
|
||||
auto AST =
|
||||
tooling::buildASTFromCode("void g(int); void f() { int x; g(x); }");
|
||||
auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A {}; A operator+(A, int); A x; x + 1; }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A { A(int); }; int x; A y(x); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A { A(); A(A); }; A x; A y(x); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ByNonConstRefArgument) {
|
||||
auto AST =
|
||||
tooling::buildASTFromCode("void g(int&); void f() { int x; g(x); }");
|
||||
auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("g(x)"));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A {}; A operator+(A&, int); A x; x + 1; }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x + 1"));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A { A(int&); }; int x; A y(x); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x"));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A { A(); A(A&); }; A x; A y(x); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ByConstRefArgument) {
|
||||
auto AST = tooling::buildASTFromCode(
|
||||
"void g(const int&); void f() { int x; g(x); }");
|
||||
auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A {}; A operator+(const A&, int); A x; x + 1; }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A { A(const int&); }; int x; A y(x); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A { A(); A(const A&); }; A x; A y(x); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ByNonConstRRefArgument) {
|
||||
auto AST = tooling::buildASTFromCode(
|
||||
"void g(int&&); void f() { int x; g(static_cast<int &&>(x)); }");
|
||||
auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre("g(static_cast<int &&>(x))"));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A {}; A operator+(A&&, int); "
|
||||
"A x; static_cast<A &&>(x) + 1; }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre("static_cast<A &&>(x) + 1"));
|
||||
|
||||
AST = tooling::buildASTFromCode("void f() { struct A { A(int&&); }; "
|
||||
"int x; A y(static_cast<int &&>(x)); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre("static_cast<int &&>(x)"));
|
||||
|
||||
AST = tooling::buildASTFromCode("void f() { struct A { A(); A(A&&); }; "
|
||||
"A x; A y(static_cast<A &&>(x)); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre("static_cast<A &&>(x)"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ByConstRRefArgument) {
|
||||
auto AST = tooling::buildASTFromCode(
|
||||
"void g(const int&&); void f() { int x; g(static_cast<int&&>(x)); }");
|
||||
auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A {}; A operator+(const A&&, int); "
|
||||
"A x; static_cast<A&&>(x) + 1; }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode("void f() { struct A { A(const int&&); }; "
|
||||
"int x; A y(static_cast<int&&>(x)); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode("void f() { struct A { A(); A(const A&&); }; "
|
||||
"A x; A y(static_cast<A&&>(x)); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, Move) {
|
||||
// Technically almost the same as ByNonConstRRefArgument, just double checking
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"namespace std {"
|
||||
"template<class T> struct remove_reference { typedef T type; };"
|
||||
"template<class T> struct remove_reference<T&> { typedef T type; };"
|
||||
"template<class T> struct remove_reference<T&&> { typedef T type; };"
|
||||
"template<class T> typename std::remove_reference<T>::type&& "
|
||||
"move(T&& t) noexcept; }"
|
||||
"void f() { struct A {}; A x; std::move(x); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("std::move(x)"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, Forward) {
|
||||
// Technically almost the same as ByNonConstRefArgument, just double checking
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"namespace std {"
|
||||
"template<class T> struct remove_reference { typedef T type; };"
|
||||
"template<class T> struct remove_reference<T&> { typedef T type; };"
|
||||
"template<class T> struct remove_reference<T&&> { typedef T type; };"
|
||||
"template<class T> T&& "
|
||||
"forward(typename std::remove_reference<T>::type&) noexcept;"
|
||||
"template<class T> T&& "
|
||||
"forward(typename std::remove_reference<T>::type&&) noexcept;"
|
||||
"void f() { struct A {}; A x; std::forward<A &>(x); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre("std::forward<A &>(x)"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ReturnAsValue) {
|
||||
const auto AST = tooling::buildASTFromCode("int f() { int x; return x; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ReturnAsNonConstRef) {
|
||||
const auto AST = tooling::buildASTFromCode("int& f() { int x; return x; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("return x;"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ReturnAsConstRef) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("const int& f() { int x; return x; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ReturnAsNonConstRRef) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"int&& f() { int x; return static_cast<int &&>(x); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre("return static_cast<int &&>(x);"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ReturnAsConstRRef) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"const int&& f() { int x; return static_cast<int&&>(x); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, TakeAddress) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void g(int*); void f() { int x; g(&x); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("&x"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ArrayToPointerDecay) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void g(int*); void f() { int x[2]; g(x); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, FollowRefModified) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x; int& r0 = x; int& r1 = r0; int& r2 = r1; "
|
||||
"int& r3 = r2; r3 = 10; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre("r0", "r1", "r2", "r3", "r3 = 10"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, FollowRefNotModified) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x; int& r0 = x; int& r1 = r0; int& r2 = r1; "
|
||||
"int& r3 = r2; int& r4 = r3; int& r5 = r4;}");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, FollowConditionalRefModified) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x, y; bool b; int &r = b ? x : y; r = 10; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("r", "r = 10"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, FollowConditionalRefNotModified) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x, y; bool b; int& r = b ? x : y; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ArrayElementModified) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void f() { int x[2]; x[0] = 10; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x[0] = 10"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, ArrayElementNotModified) {
|
||||
const auto AST = tooling::buildASTFromCode("void f() { int x[2]; x[0]; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, NestedMemberModified) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A { int vi; }; struct B { A va; }; "
|
||||
"struct C { B vb; }; C x; x.vb.va.vi = 10; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.vb.va.vi = 10"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, NestedMemberNotModified) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { struct A { int vi; }; struct B { A va; }; "
|
||||
"struct C { B vb; }; C x; x.vb.va.vi; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, CastToValue) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void f() { int x; static_cast<double>(x); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, CastToRefModified) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x; static_cast<int &>(x) = 10; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre("static_cast<int &>(x) = 10"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, CastToRefNotModified) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void f() { int x; static_cast<int&>(x); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, CastToConstRef) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x; static_cast<const int&>(x); }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, LambdaDefaultCaptureByValue) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void f() { int x; [=]() { x = 10; }; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, LambdaExplicitCaptureByValue) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void f() { int x; [x]() { x = 10; }; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, LambdaDefaultCaptureByRef) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void f() { int x; [&]() { x = 10; }; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre(ResultOf(removeSpace, "[&](){x=10;}")));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, LambdaExplicitCaptureByRef) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void f() { int x; [&x]() { x = 10; }; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()),
|
||||
ElementsAre(ResultOf(removeSpace, "[&x](){x=10;}")));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, RangeForArrayByRefModified) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x[2]; for (int& e : x) e = 10; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("e", "e = 10"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, RangeForArrayByRefNotModified) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("void f() { int x[2]; for (int& e : x) e; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, RangeForArrayByValue) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x[2]; for (int e : x) e = 10; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, RangeForArrayByConstRef) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x[2]; for (const int& e : x) e; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, RangeForNonArrayByRefModified) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("struct V { int* begin(); int* end(); };"
|
||||
"void f() { V x; for (int& e : x) e = 10; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("e", "e = 10"));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, RangeForNonArrayByRefNotModified) {
|
||||
const auto AST =
|
||||
tooling::buildASTFromCode("struct V { int* begin(); int* end(); };"
|
||||
"void f() { V x; for (int& e : x) e; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, RangeForNonArrayByValue) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"struct V { const int* begin() const; const int* end() const; };"
|
||||
"void f() { V x; for (int e : x) e; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, RangeForNonArrayByConstRef) {
|
||||
const auto AST = tooling::buildASTFromCode(
|
||||
"struct V { const int* begin() const; const int* end() const; };"
|
||||
"void f() { V x; for (const int& e : x) e; }");
|
||||
const auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, UnevaluatedExpressions) {
|
||||
auto AST = tooling::buildASTFromCode(
|
||||
"void f() { int x, y; decltype(x = 10) z = y; }");
|
||||
auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { int x, y; __typeof(x = 10) z = y; }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { int x, y; __typeof__(x = 10) z = y; }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode("void f() { int x; sizeof(x = 10); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode("void f() { int x; alignof(x = 10); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode("void f() { int x; noexcept(x = 10); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode("#include <typeinfo>\n"
|
||||
"void f() { int x; typeid(x = 10); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"void f() { int x; _Generic(x = 10, int: 0, default: 1); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_FALSE(isMutated(Results, AST.get()));
|
||||
}
|
||||
|
||||
TEST(ExprMutationAnalyzerTest, NotUnevaluatedExpressions) {
|
||||
auto AST = tooling::buildASTFromCode("void f() { int x; sizeof(int[x++]); }");
|
||||
auto Results =
|
||||
match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x++"));
|
||||
|
||||
AST = tooling::buildASTFromCode(
|
||||
"#include <typeinfo>\n"
|
||||
"struct A { virtual ~A(); }; struct B : A {};"
|
||||
"struct X { A& f(); }; void f() { X x; typeid(x.f()); }");
|
||||
Results = match(withEnclosingCompound(declRefTo("x")), AST->getASTContext());
|
||||
EXPECT_THAT(mutatedBy(Results, AST.get()), ElementsAre("x.f()"));
|
||||
}
|
||||
|
||||
} // namespace test
|
||||
} // namespace tidy
|
||||
} // namespace clang
|
||||
Loading…
Reference in New Issue