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/*
This file is part of the clazy static checker.
Copyright (C) 2016 Sergio Martins <smartins@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "SuppressionManager.h"
#include "clazy_stl.h"
#include <clang/Basic/SourceManager.h>
#include <clang/Basic/LangOptions.h>
#include <clang/Lex/Lexer.h>
#ifndef NO_STD_REGEX
# include <regex>
#endif
using namespace clang;
using namespace std;
SuppressionManager::SuppressionManager()
{
}
bool SuppressionManager::isSuppressed(const std::string &checkName, clang::SourceLocation loc,
const clang::SourceManager &sm, const clang::LangOptions &lo) const
{
#ifdef NO_STD_REGEX
return false;
#endif
if (loc.isMacroID())
loc = sm.getExpansionLoc(loc);
FileID fileID = sm.getFileID(loc);
if (fileID.isInvalid())
return false;
auto it = m_processedFileIDs.find(fileID.getHashValue());
const bool notProcessedYet = (it == m_processedFileIDs.cend());
if (notProcessedYet) {
parseFile(fileID, sm, lo);
it = m_processedFileIDs.find(fileID.getHashValue());
}
Suppressions &suppressions = (*it).second;
// Case 1: clazy:skip, the whole file is skipped, regardless of which check
if (suppressions.skipEntireFile)
return true;
// Case 2: clazy:excludeall=foo, the check foo will be ignored for this file
const bool checkIsSuppressed = suppressions.checksToSkip.find(checkName) != suppressions.checksToSkip.cend();
if (checkIsSuppressed)
return true;
// Case 3: clazy:exclude=foo, the check foo will be ignored for this file in this line number
if (loc.isInvalid())
return false;
const int lineNumber = sm.getSpellingLineNumber(loc);
const bool checkIsSuppressedByLine = suppressions.checksToSkipByLine.find(LineAndCheckName(lineNumber, checkName)) != suppressions.checksToSkipByLine.cend();
return checkIsSuppressedByLine;
}
void SuppressionManager::parseFile(FileID id, const SourceManager &sm, const clang::LangOptions &lo) const
{
#ifndef NO_STD_REGEX
const unsigned hash = id.getHashValue();
auto it = m_processedFileIDs.insert({hash, Suppressions()}).first;
Suppressions &suppressions = (*it).second;
bool invalid = false;
auto buffer = sm.getBuffer(id, &invalid);
if (invalid) {
llvm::errs() << "SuppressionManager::parseFile: Invalid buffer ";
if (buffer)
llvm::errs() << buffer->getBuffer() << "\n";
return;
}
Lexer lexer(id, buffer, sm, lo);
lexer.SetCommentRetentionState(true);
Token token;
while (!lexer.LexFromRawLexer(token)) {
if (token.getKind() == tok::comment) {
std::string comment = Lexer::getSpelling(token, sm, lo);
if (clazy::contains(comment, "clazy:skip")) {
suppressions.skipEntireFile = true;
return;
}
static regex rx(R"(clazy:excludeall=(.*?)(\s|$))");
smatch match;
if (regex_search(comment, match, rx) && match.size() > 1) {
vector<string> checks = clazy::splitString(match[1], ',');
suppressions.checksToSkip.insert(checks.cbegin(), checks.cend());
}
const int lineNumber = sm.getSpellingLineNumber(token.getLocation());
if (lineNumber < 0) {
llvm::errs() << "SuppressionManager::parseFile: Invalid line number " << lineNumber << "\n";
continue;
}
static regex rx2(R"(clazy:exclude=(.*?)(\s|$))");
if (regex_search(comment, match, rx2) && match.size() > 1) {
vector<string> checks = clazy::splitString(match[1], ',');
for (const string &checkName : checks) {
suppressions.checksToSkipByLine.insert(LineAndCheckName(lineNumber, checkName));
}
}
}
}
#endif
}
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