419 lines
13 KiB
C++
419 lines
13 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2018 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "suppressions.h"
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#include "errorlogger.h"
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#include "mathlib.h"
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#include "path.h"
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#include <tinyxml2.h>
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#include <algorithm>
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#include <cctype> // std::isdigit, std::isalnum, etc
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#include <stack>
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#include <sstream>
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#include <utility>
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class ErrorLogger;
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static bool isValidGlobPattern(const std::string &pattern)
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{
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for (std::string::const_iterator i = pattern.begin(); i != pattern.end(); ++i) {
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if (*i == '*' || *i == '?') {
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std::string::const_iterator j = i + 1;
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if (j != pattern.end() && (*j == '*' || *j == '?')) {
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return false;
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}
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}
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}
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return true;
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}
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static bool isAcceptedErrorIdChar(char c)
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{
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switch (c) {
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case '_':
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case '-':
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case '.':
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return true;
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default:
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return std::isalnum(c);
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}
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}
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std::string Suppressions::parseFile(std::istream &istr)
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{
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// Change '\r' to '\n' in the istr
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std::string filedata;
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std::string line;
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while (std::getline(istr, line))
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filedata += line + "\n";
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std::replace(filedata.begin(), filedata.end(), '\r', '\n');
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// Parse filedata..
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std::istringstream istr2(filedata);
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while (std::getline(istr2, line)) {
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// Skip empty lines
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if (line.empty())
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continue;
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// Skip comments
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if (line.length() >= 2 && line[0] == '/' && line[1] == '/')
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continue;
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const std::string errmsg(addSuppressionLine(line));
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if (!errmsg.empty())
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return errmsg;
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}
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return "";
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}
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std::string Suppressions::parseXmlFile(const char *filename)
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{
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tinyxml2::XMLDocument doc;
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const tinyxml2::XMLError error = doc.LoadFile(filename);
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if (error == tinyxml2::XML_ERROR_FILE_NOT_FOUND)
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return "File not found";
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if (error != tinyxml2::XML_SUCCESS)
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return "Failed to parse XML file";
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const tinyxml2::XMLElement * const rootnode = doc.FirstChildElement();
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for (const tinyxml2::XMLElement * e = rootnode->FirstChildElement(); e; e = e->NextSiblingElement()) {
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if (std::strcmp(e->Name(), "suppress") != 0)
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return "Invalid suppression xml file format, expected <suppress> element but got a <" + std::string(e->Name()) + '>';
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Suppression s;
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for (const tinyxml2::XMLElement * e2 = e->FirstChildElement(); e2; e2 = e2->NextSiblingElement()) {
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const char *text = e2->GetText() ? e2->GetText() : "";
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if (std::strcmp(e2->Name(), "id") == 0)
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s.errorId = text;
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else if (std::strcmp(e2->Name(), "fileName") == 0)
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s.fileName = text;
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else if (std::strcmp(e2->Name(), "lineNumber") == 0)
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s.lineNumber = std::atoi(text);
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else if (std::strcmp(e2->Name(), "symbolName") == 0)
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s.symbolName = text;
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else
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return "Unknown suppression element <" + std::string(e2->Name()) + ">, expected <id>/<fileName>/<lineNumber>/<symbolName>";
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}
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const std::string err = addSuppression(s);
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if (!err.empty())
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return err;
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}
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return "";
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}
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std::string Suppressions::addSuppressionLine(const std::string &line)
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{
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std::istringstream lineStream(line);
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Suppressions::Suppression suppression;
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if (std::getline(lineStream, suppression.errorId, ':')) {
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if (std::getline(lineStream, suppression.fileName)) {
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// If there is not a dot after the last colon in "file" then
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// the colon is a separator and the contents after the colon
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// is a line number..
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// Get position of last colon
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const std::string::size_type pos = suppression.fileName.rfind(':');
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// if a colon is found and there is no dot after it..
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if (pos != std::string::npos &&
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suppression.fileName.find('.', pos) == std::string::npos) {
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// Try to parse out the line number
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try {
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std::istringstream istr1(suppression.fileName.substr(pos+1));
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istr1 >> suppression.lineNumber;
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} catch (...) {
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suppression.lineNumber = Suppressions::Suppression::NO_LINE;
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}
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if (suppression.lineNumber > Suppressions::Suppression::NO_LINE) {
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suppression.fileName.erase(pos);
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}
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}
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}
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}
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suppression.fileName = Path::simplifyPath(suppression.fileName);
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return addSuppression(suppression);
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}
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std::string Suppressions::addSuppression(const Suppressions::Suppression &suppression)
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{
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// Check that errorId is valid..
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if (suppression.errorId.empty()) {
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return "Failed to add suppression. No id.";
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}
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if (suppression.errorId != "*") {
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for (std::string::size_type pos = 0; pos < suppression.errorId.length(); ++pos) {
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if (suppression.errorId[pos] < 0 || !isAcceptedErrorIdChar(suppression.errorId[pos])) {
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return "Failed to add suppression. Invalid id \"" + suppression.errorId + "\"";
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}
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if (pos == 0 && std::isdigit(suppression.errorId[pos])) {
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return "Failed to add suppression. Invalid id \"" + suppression.errorId + "\"";
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}
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}
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}
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if (!isValidGlobPattern(suppression.errorId))
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return "Failed to add suppression. Invalid glob pattern '" + suppression.errorId + "'.";
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if (!isValidGlobPattern(suppression.fileName))
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return "Failed to add suppression. Invalid glob pattern '" + suppression.fileName + "'.";
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mSuppressions.push_back(suppression);
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return "";
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}
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void Suppressions::ErrorMessage::setFileName(const std::string &s)
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{
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mFileName = Path::simplifyPath(s);
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}
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bool Suppressions::Suppression::parseComment(std::string comment, std::string *errorMessage)
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{
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if (comment.size() < 2)
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return false;
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if (comment.find(';') != std::string::npos)
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comment.erase(comment.find(';'));
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if (comment.find("//", 2) != std::string::npos)
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comment.erase(comment.find("//",2));
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if (comment.compare(comment.size() - 2, 2, "*/") == 0)
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comment.erase(comment.size() - 2, 2);
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std::istringstream iss(comment.substr(2));
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std::string word;
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iss >> word;
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if (word != "cppcheck-suppress")
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return false;
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iss >> errorId;
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if (!iss)
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return false;
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while (iss) {
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iss >> word;
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if (!iss)
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break;
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if (word.find_first_not_of("+-*/%#;") == std::string::npos)
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break;
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if (word.compare(0,11,"symbolName=")==0)
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symbolName = word.substr(11);
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else if (errorMessage && errorMessage->empty())
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*errorMessage = "Bad suppression attribute '" + word + "'. You can write comments in the comment after a ; or //. Valid suppression attributes; symbolName=sym";
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}
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return true;
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}
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bool Suppressions::Suppression::isSuppressed(const Suppressions::ErrorMessage &errmsg) const
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{
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if (!errorId.empty() && !matchglob(errorId, errmsg.errorId))
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return false;
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if (!fileName.empty() && !matchglob(fileName, errmsg.getFileName()))
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return false;
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if (lineNumber > NO_LINE && lineNumber != errmsg.lineNumber)
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return false;
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if (!symbolName.empty()) {
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for (std::string::size_type pos = 0; pos < errmsg.symbolNames.size();) {
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const std::string::size_type pos2 = errmsg.symbolNames.find('\n',pos);
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std::string symname;
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if (pos2 == std::string::npos) {
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symname = errmsg.symbolNames.substr(pos);
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pos = pos2;
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} else {
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symname = errmsg.symbolNames.substr(pos,pos2-pos);
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pos = pos2+1;
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}
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if (matchglob(symbolName, symname))
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return true;
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}
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return false;
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}
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return true;
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}
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bool Suppressions::Suppression::isMatch(const Suppressions::ErrorMessage &errmsg)
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{
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if (!isSuppressed(errmsg))
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return false;
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matched = true;
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return true;
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}
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std::string Suppressions::Suppression::getText() const
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{
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std::string ret;
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if (!errorId.empty())
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ret = errorId;
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if (!fileName.empty())
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ret += " fileName=" + fileName;
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if (lineNumber > NO_LINE)
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ret += " lineNumber=" + MathLib::toString(lineNumber);
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if (!symbolName.empty())
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ret += " symbolName=" + symbolName;
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if (ret.compare(0,1," ")==0)
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return ret.substr(1);
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return ret;
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}
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bool Suppressions::isSuppressed(const Suppressions::ErrorMessage &errmsg)
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{
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const bool unmatchedSuppression(errmsg.errorId == "unmatchedSuppression");
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for (Suppression &s : mSuppressions) {
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if (unmatchedSuppression && s.errorId != errmsg.errorId)
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continue;
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if (s.isMatch(errmsg))
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return true;
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}
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return false;
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}
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bool Suppressions::isSuppressedLocal(const Suppressions::ErrorMessage &errmsg)
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{
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const bool unmatchedSuppression(errmsg.errorId == "unmatchedSuppression");
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for (Suppression &s : mSuppressions) {
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if (!s.isLocal())
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continue;
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if (unmatchedSuppression && s.errorId != errmsg.errorId)
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continue;
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if (s.isMatch(errmsg))
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return true;
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}
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return false;
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}
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void Suppressions::dump(std::ostream & out)
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{
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out << " <suppressions>" << std::endl;
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for (const Suppression &suppression : mSuppressions) {
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out << " <suppression";
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out << " errorId=\"" << ErrorLogger::toxml(suppression.errorId) << '"';
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if (!suppression.fileName.empty())
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out << " fileName=\"" << ErrorLogger::toxml(suppression.fileName) << '"';
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if (suppression.lineNumber > Suppression::NO_LINE)
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out << " lineNumber=\"" << suppression.lineNumber << '"';
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if (!suppression.symbolName.empty())
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out << " symbolName=\"" << ErrorLogger::toxml(suppression.symbolName) << '\"';
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out << " />" << std::endl;
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}
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out << " </suppressions>" << std::endl;
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}
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#include <iostream>
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std::list<Suppressions::Suppression> Suppressions::getUnmatchedLocalSuppressions(const std::string &file, const bool unusedFunctionChecking) const
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{
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std::list<Suppression> result;
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for (const Suppression &s : mSuppressions) {
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if (s.matched)
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continue;
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if (!unusedFunctionChecking && s.errorId == "unusedFunction")
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continue;
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if (file.empty() || !s.isLocal() || s.fileName != file)
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continue;
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result.push_back(s);
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}
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return result;
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}
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std::list<Suppressions::Suppression> Suppressions::getUnmatchedGlobalSuppressions(const bool unusedFunctionChecking) const
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{
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std::list<Suppression> result;
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for (const Suppression &s : mSuppressions) {
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if (s.matched)
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continue;
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if (!unusedFunctionChecking && s.errorId == "unusedFunction")
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continue;
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if (s.isLocal())
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continue;
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result.push_back(s);
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}
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return result;
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}
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bool Suppressions::matchglob(const std::string &pattern, const std::string &name)
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{
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const char *p = pattern.c_str();
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const char *n = name.c_str();
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std::stack<std::pair<const char *, const char *> > backtrack;
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for (;;) {
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bool matching = true;
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while (*p != '\0' && matching) {
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switch (*p) {
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case '*':
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// Step forward until we match the next character after *
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while (*n != '\0' && *n != p[1]) {
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n++;
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}
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if (*n != '\0') {
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// If this isn't the last possibility, save it for later
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backtrack.push(std::make_pair(p, n));
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}
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break;
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case '?':
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// Any character matches unless we're at the end of the name
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if (*n != '\0') {
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n++;
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} else {
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matching = false;
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}
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break;
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default:
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// Non-wildcard characters match literally
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if (*n == *p) {
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n++;
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} else if (*n == '\\' && *p == '/') {
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n++;
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} else if (*n == '/' && *p == '\\') {
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n++;
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} else {
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matching = false;
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}
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break;
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}
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p++;
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}
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// If we haven't failed matching and we've reached the end of the name, then success
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if (matching && *n == '\0') {
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return true;
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}
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// If there are no other paths to try, then fail
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if (backtrack.empty()) {
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return false;
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}
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// Restore pointers from backtrack stack
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p = backtrack.top().first;
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n = backtrack.top().second;
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backtrack.pop();
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// Advance name pointer by one because the current position didn't work
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n++;
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}
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}
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