NoexceptFunctionBaseCheck.cpp

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//===----------------------------------------------------------------------===//
//
// 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 "NoexceptFunctionBaseCheck.h"
#include "../utils/LexerUtils.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
 
using namespace clang::ast_matchers;
 
namespace clang::tidy::performance {
 
void NoexceptFunctionBaseCheck::check(const MatchFinder::MatchResult &Result) {
  const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>(BindFuncDeclName);
  assert(FuncDecl);
 
  if (SpecAnalyzer.analyze(FuncDecl) !=
      utils::ExceptionSpecAnalyzer::State::Throwing)
    return;
 
  // Don't complain about nothrow(false), but complain on nothrow(expr)
  // where expr evaluates to false.
  const auto ExceptionSpecSourceRange = FuncDecl->getExceptionSpecSourceRange();
  if (ExceptionSpecSourceRange.isValid()) {
    const auto *ProtoType = FuncDecl->getType()->castAs<FunctionProtoType>();
    const Expr *NoexceptExpr = ProtoType->getNoexceptExpr();
    if (NoexceptExpr) {
      NoexceptExpr = NoexceptExpr->IgnoreImplicit();
      if (!isa<CXXBoolLiteralExpr>(NoexceptExpr))
        reportNoexceptEvaluatedToFalse(FuncDecl, NoexceptExpr);
      return;
    }
  }
 
  const auto Diag = reportMissingNoexcept(FuncDecl);
 
  // Add FixIt hints.
  const SourceManager &SM = *Result.SourceManager;
 
  const SourceLocation NoexceptLoc =
      utils::lexer::getLocationForNoexceptSpecifier(FuncDecl, SM);
  if (NoexceptLoc.isValid())
    Diag << FixItHint::CreateInsertion(NoexceptLoc, " noexcept ");
}
 
} // namespace clang::tidy::performance