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//===--- CloexecCheck.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 "CloexecCheck.h"
#include "../utils/ASTUtils.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Lexer.h"
using namespace clang::ast_matchers;
namespace clang::tidy::android {
namespace {
// Helper function to form the correct string mode for Type3.
// Build the replace text. If it's string constant, add <Mode> directly in the
// end of the string. Else, add <Mode>.
std::string buildFixMsgForStringFlag(const Expr *Arg, const SourceManager &SM,
const LangOptions &LangOpts, char Mode) {
if (Arg->getBeginLoc().isMacroID())
return (Lexer::getSourceText(
CharSourceRange::getTokenRange(Arg->getSourceRange()), SM,
LangOpts) +
" \"" + Twine(Mode) + "\"")
.str();
StringRef SR = cast<StringLiteral>(Arg->IgnoreParenCasts())->getString();
return ("\"" + SR + Twine(Mode) + "\"").str();
}
} // namespace
const char *CloexecCheck::FuncDeclBindingStr = "funcDecl";
const char *CloexecCheck::FuncBindingStr ="func";
void CloexecCheck::registerMatchersImpl(
MatchFinder *Finder, internal::Matcher<FunctionDecl> Function) {
// We assume all the checked APIs are C functions.
Finder->addMatcher(
callExpr(
callee(functionDecl(isExternC(), Function).bind(FuncDeclBindingStr)))
.bind(FuncBindingStr),
this);
}
void CloexecCheck::insertMacroFlag(const MatchFinder::MatchResult &Result,
StringRef MacroFlag, int ArgPos) {
const auto *MatchedCall = Result.Nodes.getNodeAs<CallExpr>(FuncBindingStr);
const auto *FlagArg = MatchedCall->getArg(ArgPos);
const auto *FD = Result.Nodes.getNodeAs<FunctionDecl>(FuncDeclBindingStr);
SourceManager &SM = *Result.SourceManager;
if (utils::exprHasBitFlagWithSpelling(FlagArg->IgnoreParenCasts(), SM,
Result.Context->getLangOpts(),
MacroFlag))
return;
SourceLocation EndLoc =
Lexer::getLocForEndOfToken(SM.getFileLoc(FlagArg->getEndLoc()), 0, SM,
Result.Context->getLangOpts());
diag(EndLoc, "%0 should use %1 where possible")
<< FD << MacroFlag
<< FixItHint::CreateInsertion(EndLoc, (Twine(" | ") + MacroFlag).str());
}
void CloexecCheck::replaceFunc(const MatchFinder::MatchResult &Result,
StringRef WarningMsg, StringRef FixMsg) {
const auto *MatchedCall = Result.Nodes.getNodeAs<CallExpr>(FuncBindingStr);
diag(MatchedCall->getBeginLoc(), WarningMsg)
<< FixItHint::CreateReplacement(MatchedCall->getSourceRange(), FixMsg);
}
void CloexecCheck::insertStringFlag(
const ast_matchers::MatchFinder::MatchResult &Result, const char Mode,
const int ArgPos) {
const auto *MatchedCall = Result.Nodes.getNodeAs<CallExpr>(FuncBindingStr);
const auto *FD = Result.Nodes.getNodeAs<FunctionDecl>(FuncDeclBindingStr);
const auto *ModeArg = MatchedCall->getArg(ArgPos);
// Check if the <Mode> may be in the mode string.
const auto *ModeStr = dyn_cast<StringLiteral>(ModeArg->IgnoreParenCasts());
if (!ModeStr || ModeStr->getString().contains(Mode))
return;
std::string ReplacementText = buildFixMsgForStringFlag(
ModeArg, *Result.SourceManager, Result.Context->getLangOpts(), Mode);
diag(ModeArg->getBeginLoc(), "use %0 mode '%1' to set O_CLOEXEC")
<< FD << std::string(1, Mode)
<< FixItHint::CreateReplacement(ModeArg->getSourceRange(),
ReplacementText);
}
StringRef CloexecCheck::getSpellingArg(const MatchFinder::MatchResult &Result,
int N) const {
const auto *MatchedCall = Result.Nodes.getNodeAs<CallExpr>(FuncBindingStr);
const SourceManager &SM = *Result.SourceManager;
return Lexer::getSourceText(
CharSourceRange::getTokenRange(MatchedCall->getArg(N)->getSourceRange()),
SM, Result.Context->getLangOpts());
}
} // namespace clang::tidy::android
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