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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
//===--- AvoidGotoCheck.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 "AvoidGotoCheck.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 cppcoreguidelines {
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namespace {
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AST_MATCHER(GotoStmt, isForwardJumping) {
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return Node.getBeginLoc() < Node.getLabel()->getBeginLoc();
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}
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} // namespace
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void AvoidGotoCheck::registerMatchers(MatchFinder *Finder) {
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if (!getLangOpts().CPlusPlus)
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return;
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// TODO: This check does not recognize `IndirectGotoStmt` which is a
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// GNU extension. These must be matched separately and an AST matcher
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// is currently missing for them.
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// Check if the 'goto' is used for control flow other than jumping
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// out of a nested loop.
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auto Loop = stmt(anyOf(forStmt(), cxxForRangeStmt(), whileStmt(), doStmt()));
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auto NestedLoop =
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stmt(anyOf(forStmt(hasAncestor(Loop)), cxxForRangeStmt(hasAncestor(Loop)),
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whileStmt(hasAncestor(Loop)), doStmt(hasAncestor(Loop))));
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Finder->addMatcher(gotoStmt(anyOf(unless(hasAncestor(NestedLoop)),
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unless(isForwardJumping())))
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.bind("goto"),
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this);
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}
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void AvoidGotoCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *Goto = Result.Nodes.getNodeAs<GotoStmt>("goto");
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diag(Goto->getGotoLoc(), "avoid using 'goto' for flow control")
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<< Goto->getSourceRange();
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diag(Goto->getLabel()->getBeginLoc(), "label defined here",
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DiagnosticIDs::Note);
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}
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} // namespace cppcoreguidelines
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} // namespace tidy
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} // namespace clang
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