52 lines
2.0 KiB
C++
52 lines
2.0 KiB
C++
//===--- NoEscapeCheck.cpp - clang-tidy -----------------------------------===//
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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 "NoEscapeCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace bugprone {
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void NoEscapeCheck::registerMatchers(MatchFinder *Finder) {
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Finder->addMatcher(callExpr(callee(functionDecl(hasName("::dispatch_async"))),
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argumentCountIs(2),
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hasArgument(1, blockExpr().bind("arg-block"))),
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this);
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Finder->addMatcher(callExpr(callee(functionDecl(hasName("::dispatch_after"))),
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argumentCountIs(3),
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hasArgument(2, blockExpr().bind("arg-block"))),
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this);
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}
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void NoEscapeCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *MatchedEscapingBlock =
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Result.Nodes.getNodeAs<BlockExpr>("arg-block");
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const BlockDecl *EscapingBlockDecl = MatchedEscapingBlock->getBlockDecl();
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for (const BlockDecl::Capture &CapturedVar : EscapingBlockDecl->captures()) {
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const VarDecl *Var = CapturedVar.getVariable();
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if (Var && Var->hasAttr<NoEscapeAttr>()) {
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// FIXME: Add a method to get the location of the use of a CapturedVar so
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// that we can diagnose the use of the pointer instead of the block.
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diag(MatchedEscapingBlock->getBeginLoc(),
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"pointer %0 with attribute 'noescape' is captured by an "
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"asynchronously-executed block")
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<< Var;
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diag(Var->getBeginLoc(), "the 'noescape' attribute is declared here.",
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DiagnosticIDs::Note);
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}
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}
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}
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} // namespace bugprone
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} // namespace tidy
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} // namespace clang
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