| 1 | //===--- NoEscapeCheck.cpp - clang-tidy -----------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "NoEscapeCheck.h" |
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| 10 | #include "clang/AST/ASTContext.h" |
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| 11 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
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| 12 | |
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| 13 | using namespace clang::ast_matchers; |
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| 14 | |
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| 15 | namespace clang::tidy::bugprone { |
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| 16 | |
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| 17 | void NoEscapeCheck::registerMatchers(MatchFinder *Finder) { |
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| 18 | Finder->addMatcher(NodeMatch: callExpr(callee(InnerMatcher: functionDecl(hasName(Name: "::dispatch_async" ))), |
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| 19 | argumentCountIs(N: 2), |
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| 20 | hasArgument(N: 1, InnerMatcher: blockExpr().bind(ID: "arg-block" ))), |
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| 21 | Action: this); |
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| 22 | Finder->addMatcher(NodeMatch: callExpr(callee(InnerMatcher: functionDecl(hasName(Name: "::dispatch_after" ))), |
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| 23 | argumentCountIs(N: 3), |
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| 24 | hasArgument(N: 2, InnerMatcher: blockExpr().bind(ID: "arg-block" ))), |
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| 25 | Action: this); |
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| 26 | } |
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| 27 | |
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| 28 | void NoEscapeCheck::check(const MatchFinder::MatchResult &Result) { |
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| 29 | const auto *MatchedEscapingBlock = |
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| 30 | Result.Nodes.getNodeAs<BlockExpr>(ID: "arg-block" ); |
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| 31 | const BlockDecl *EscapingBlockDecl = MatchedEscapingBlock->getBlockDecl(); |
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| 32 | for (const BlockDecl::Capture &CapturedVar : EscapingBlockDecl->captures()) { |
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| 33 | const VarDecl *Var = CapturedVar.getVariable(); |
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| 34 | if (Var && Var->hasAttr<NoEscapeAttr>()) { |
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| 35 | // FIXME: Add a method to get the location of the use of a CapturedVar so |
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| 36 | // that we can diagnose the use of the pointer instead of the block. |
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| 37 | diag(Loc: MatchedEscapingBlock->getBeginLoc(), |
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| 38 | Description: "pointer %0 with attribute 'noescape' is captured by an " |
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| 39 | "asynchronously-executed block" ) |
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| 40 | << Var; |
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| 41 | diag(Var->getBeginLoc(), "the 'noescape' attribute is declared here." , |
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| 42 | DiagnosticIDs::Note); |
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| 43 | } |
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| 44 | } |
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| 45 | } |
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| 46 | |
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| 47 | } // namespace clang::tidy::bugprone |
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| 48 | |
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