97 lines
3.7 KiB
C++
97 lines
3.7 KiB
C++
//===--- RedundantControlFlowCheck.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 "RedundantControlFlowCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/Lex/Lexer.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 readability {
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namespace {
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const char *const RedundantReturnDiag = "redundant return statement at the end "
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"of a function with a void return type";
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const char *const RedundantContinueDiag = "redundant continue statement at the "
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"end of loop statement";
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bool isLocationInMacroExpansion(const SourceManager &SM, SourceLocation Loc) {
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return SM.isMacroBodyExpansion(Loc) || SM.isMacroArgExpansion(Loc);
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}
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} // namespace
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void RedundantControlFlowCheck::registerMatchers(MatchFinder *Finder) {
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Finder->addMatcher(
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functionDecl(
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isDefinition(), returns(voidType()),
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has(compoundStmt(hasAnySubstatement(returnStmt(unless(has(expr())))))
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.bind("return"))),
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this);
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Finder->addMatcher(
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mapAnyOf(forStmt, cxxForRangeStmt, whileStmt, doStmt)
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.with(hasBody(compoundStmt(hasAnySubstatement(continueStmt()))
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.bind("continue"))),
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this);
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}
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void RedundantControlFlowCheck::check(const MatchFinder::MatchResult &Result) {
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if (const auto *Return = Result.Nodes.getNodeAs<CompoundStmt>("return"))
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checkRedundantReturn(Result, Return);
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else if (const auto *Continue =
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Result.Nodes.getNodeAs<CompoundStmt>("continue"))
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checkRedundantContinue(Result, Continue);
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}
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void RedundantControlFlowCheck::checkRedundantReturn(
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const MatchFinder::MatchResult &Result, const CompoundStmt *Block) {
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CompoundStmt::const_reverse_body_iterator Last = Block->body_rbegin();
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if (const auto *Return = dyn_cast<ReturnStmt>(*Last))
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issueDiagnostic(Result, Block, Return->getSourceRange(),
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RedundantReturnDiag);
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}
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void RedundantControlFlowCheck::checkRedundantContinue(
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const MatchFinder::MatchResult &Result, const CompoundStmt *Block) {
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CompoundStmt::const_reverse_body_iterator Last = Block->body_rbegin();
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if (const auto *Continue = dyn_cast<ContinueStmt>(*Last))
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issueDiagnostic(Result, Block, Continue->getSourceRange(),
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RedundantContinueDiag);
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}
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void RedundantControlFlowCheck::issueDiagnostic(
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const MatchFinder::MatchResult &Result, const CompoundStmt *const Block,
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const SourceRange &StmtRange, const char *const Diag) {
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SourceManager &SM = *Result.SourceManager;
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if (isLocationInMacroExpansion(SM, StmtRange.getBegin()))
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return;
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CompoundStmt::const_reverse_body_iterator Previous = ++Block->body_rbegin();
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SourceLocation Start;
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if (Previous != Block->body_rend())
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Start = Lexer::findLocationAfterToken(
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dyn_cast<Stmt>(*Previous)->getEndLoc(), tok::semi, SM, getLangOpts(),
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/*SkipTrailingWhitespaceAndNewLine=*/true);
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if (!Start.isValid())
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Start = StmtRange.getBegin();
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auto RemovedRange = CharSourceRange::getCharRange(
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Start, Lexer::findLocationAfterToken(
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StmtRange.getEnd(), tok::semi, SM, getLangOpts(),
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/*SkipTrailingWhitespaceAndNewLine=*/true));
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diag(StmtRange.getBegin(), Diag) << FixItHint::CreateRemoval(RemovedRange);
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}
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} // namespace readability
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} // namespace tidy
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} // namespace clang
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