96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
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//=======- ASTUtils.cpp ------------------------------------------*- C++ -*-==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "ASTUtils.h"
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#include "PtrTypesSemantics.h"
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#include "clang/AST/CXXInheritance.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/ExprCXX.h"
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using llvm::Optional;
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namespace clang {
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std::pair<const Expr *, bool>
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tryToFindPtrOrigin(const Expr *E, bool StopAtFirstRefCountedObj) {
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while (E) {
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if (auto *cast = dyn_cast<CastExpr>(E)) {
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if (StopAtFirstRefCountedObj) {
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if (auto *ConversionFunc =
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dyn_cast_or_null<FunctionDecl>(cast->getConversionFunction())) {
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if (isCtorOfRefCounted(ConversionFunc))
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return {E, true};
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}
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}
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// FIXME: This can give false "origin" that would lead to false negatives
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// in checkers. See https://reviews.llvm.org/D37023 for reference.
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E = cast->getSubExpr();
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continue;
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}
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if (auto *call = dyn_cast<CallExpr>(E)) {
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if (auto *memberCall = dyn_cast<CXXMemberCallExpr>(call)) {
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Optional<bool> IsGetterOfRefCt =
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isGetterOfRefCounted(memberCall->getMethodDecl());
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if (IsGetterOfRefCt && *IsGetterOfRefCt) {
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E = memberCall->getImplicitObjectArgument();
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if (StopAtFirstRefCountedObj) {
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return {E, true};
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}
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continue;
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}
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}
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if (auto *operatorCall = dyn_cast<CXXOperatorCallExpr>(E)) {
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if (operatorCall->getNumArgs() == 1) {
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E = operatorCall->getArg(0);
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continue;
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}
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}
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if (auto *callee = call->getDirectCallee()) {
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if (isCtorOfRefCounted(callee)) {
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if (StopAtFirstRefCountedObj)
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return {E, true};
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E = call->getArg(0);
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continue;
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}
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if (isPtrConversion(callee)) {
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E = call->getArg(0);
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continue;
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}
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}
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}
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if (auto *unaryOp = dyn_cast<UnaryOperator>(E)) {
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// FIXME: Currently accepts ANY unary operator. Is it OK?
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E = unaryOp->getSubExpr();
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continue;
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}
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break;
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}
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// Some other expression.
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return {E, false};
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}
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bool isASafeCallArg(const Expr *E) {
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assert(E);
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if (auto *Ref = dyn_cast<DeclRefExpr>(E)) {
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if (auto *D = dyn_cast_or_null<VarDecl>(Ref->getFoundDecl())) {
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if (isa<ParmVarDecl>(D) || D->isLocalVarDecl())
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return true;
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}
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}
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// TODO: checker for method calls on non-refcounted objects
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return isa<CXXThisExpr>(E);
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}
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} // namespace clang
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