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//===--- AvoidGotoCheck.cpp - clang-tidy-----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "AvoidGotoCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace cppcoreguidelines {
namespace {
AST_MATCHER(GotoStmt, isForwardJumping) {
return Node.getBeginLoc() < Node.getLabel()->getBeginLoc();
}
} // namespace
void AvoidGotoCheck::registerMatchers(MatchFinder *Finder) {
if (!getLangOpts().CPlusPlus)
return;
// TODO: This check does not recognize `IndirectGotoStmt` which is a
// GNU extension. These must be matched separately and an AST matcher
// is currently missing for them.
// Check if the 'goto' is used for control flow other than jumping
// out of a nested loop.
auto Loop = stmt(anyOf(forStmt(), cxxForRangeStmt(), whileStmt(), doStmt()));
auto NestedLoop =
stmt(anyOf(forStmt(hasAncestor(Loop)), cxxForRangeStmt(hasAncestor(Loop)),
whileStmt(hasAncestor(Loop)), doStmt(hasAncestor(Loop))));
Finder->addMatcher(gotoStmt(anyOf(unless(hasAncestor(NestedLoop)),
unless(isForwardJumping())))
.bind("goto"),
this);
}
void AvoidGotoCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Goto = Result.Nodes.getNodeAs<GotoStmt>("goto");
diag(Goto->getGotoLoc(), "avoid using 'goto' for flow control")
<< Goto->getSourceRange();
diag(Goto->getLabel()->getBeginLoc(), "label defined here",
DiagnosticIDs::Note);
}
} // namespace cppcoreguidelines
} // namespace tidy
} // namespace clang
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