cppcheck/lib/suppressions.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2023 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "suppressions.h"
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#include "errorlogger.h"
#include "errortypes.h"
#include "path.h"
#include "utils.h"
#include "token.h"
#include "tokenize.h"
#include "tokenlist.h"
#include <algorithm>
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#include <cctype> // std::isdigit, std::isalnum, etc
#include <cstring>
#include <functional> // std::bind, std::placeholders
#include <sstream> // IWYU pragma: keep
#include <utility>
#include <tinyxml2.h>
Suppressions::ErrorMessage Suppressions::ErrorMessage::fromErrorMessage(const ::ErrorMessage &msg)
{
Suppressions::ErrorMessage ret;
ret.hash = msg.hash;
ret.errorId = msg.id;
if (!msg.callStack.empty()) {
ret.setFileName(msg.callStack.back().getfile(false));
ret.lineNumber = msg.callStack.back().line;
} else {
ret.lineNumber = Suppressions::Suppression::NO_LINE;
}
ret.certainty = msg.certainty;
ret.symbolNames = msg.symbolNames();
return ret;
}
static bool isAcceptedErrorIdChar(char c)
{
switch (c) {
case '_':
case '-':
case '.':
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return true;
default:
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return std::isalnum(c);
}
}
std::string Suppressions::parseFile(std::istream &istr)
{
// Change '\r' to '\n' in the istr
std::string filedata;
std::string line;
while (std::getline(istr, line))
filedata += line + "\n";
std::replace(filedata.begin(), filedata.end(), '\r', '\n');
// Parse filedata..
std::istringstream istr2(filedata);
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while (std::getline(istr2, line)) {
// Skip empty lines
if (line.empty())
continue;
// Skip comments
if (line.length() > 1 && line[0] == '#')
continue;
if (line.length() >= 2 && line[0] == '/' && line[1] == '/')
continue;
const std::string errmsg(addSuppressionLine(line));
if (!errmsg.empty())
return errmsg;
}
return "";
}
std::string Suppressions::parseXmlFile(const char *filename)
{
tinyxml2::XMLDocument doc;
const tinyxml2::XMLError error = doc.LoadFile(filename);
if (error == tinyxml2::XML_ERROR_FILE_NOT_FOUND)
return "File not found";
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if (error != tinyxml2::XML_SUCCESS)
return "Failed to parse XML file";
const tinyxml2::XMLElement * const rootnode = doc.FirstChildElement();
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;
for (const tinyxml2::XMLElement * e2 = e->FirstChildElement(); e2; e2 = e2->NextSiblingElement()) {
const char *text = e2->GetText() ? e2->GetText() : "";
if (std::strcmp(e2->Name(), "id") == 0)
s.errorId = text;
else if (std::strcmp(e2->Name(), "fileName") == 0)
s.fileName = text;
else if (std::strcmp(e2->Name(), "lineNumber") == 0)
s.lineNumber = strToInt<int>(text);
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else if (std::strcmp(e2->Name(), "symbolName") == 0)
s.symbolName = text;
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else if (*text && std::strcmp(e2->Name(), "hash") == 0)
s.hash = strToInt<std::size_t>(text);
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else
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return "Unknown suppression element \"" + std::string(e2->Name()) + "\", expected id/fileName/lineNumber/symbolName/hash";
}
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const std::string err = addSuppression(std::move(s));
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if (!err.empty())
return err;
}
return "";
}
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std::vector<Suppressions::Suppression> Suppressions::parseMultiSuppressComment(const std::string &comment, std::string *errorMessage)
{
std::vector<Suppression> suppressions;
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// If this function is called we assume that comment starts with "cppcheck-suppress[".
const std::string::size_type start_position = comment.find('[');
const std::string::size_type end_position = comment.find(']', start_position);
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if (end_position == std::string::npos) {
if (errorMessage && errorMessage->empty())
*errorMessage = "Bad multi suppression '" + comment + "'. legal format is cppcheck-suppress[errorId, errorId symbolName=arr, ...]";
return suppressions;
}
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// parse all suppressions
for (std::string::size_type pos = start_position; pos < end_position;) {
const std::string::size_type pos1 = pos + 1;
pos = comment.find(',', pos1);
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const std::string::size_type pos2 = (pos < end_position) ? pos : end_position;
if (pos1 == pos2)
continue;
Suppression s;
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std::istringstream iss(comment.substr(pos1, pos2-pos1));
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iss >> s.errorId;
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if (!iss) {
if (errorMessage && errorMessage->empty())
*errorMessage = "Bad multi suppression '" + comment + "'. legal format is cppcheck-suppress[errorId, errorId symbolName=arr, ...]";
suppressions.clear();
return suppressions;
}
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while (iss) {
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std::string word;
iss >> word;
if (!iss)
break;
if (word.find_first_not_of("+-*/%#;") == std::string::npos)
break;
if (startsWith(word, "symbolName=")) {
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s.symbolName = word.substr(11);
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} else {
if (errorMessage && errorMessage->empty())
*errorMessage = "Bad multi suppression '" + comment + "'. legal format is cppcheck-suppress[errorId, errorId symbolName=arr, ...]";
suppressions.clear();
return suppressions;
}
}
suppressions.push_back(std::move(s));
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}
return suppressions;
}
std::string Suppressions::addSuppressionLine(const std::string &line)
{
std::istringstream lineStream;
Suppressions::Suppression suppression;
// Strip any end of line comments
std::string::size_type endpos = std::min(line.find('#'), line.find("//"));
if (endpos != std::string::npos) {
while (endpos > 0 && std::isspace(line[endpos-1])) {
endpos--;
}
lineStream.str(line.substr(0, endpos));
} else {
lineStream.str(line);
}
if (std::getline(lineStream, suppression.errorId, ':')) {
if (std::getline(lineStream, suppression.fileName)) {
// If there is not a dot after the last colon in "file" then
// the colon is a separator and the contents after the colon
// is a line number..
// Get position of last colon
const std::string::size_type pos = suppression.fileName.rfind(':');
// if a colon is found and there is no dot after it..
if (pos != std::string::npos &&
suppression.fileName.find('.', pos) == std::string::npos) {
// Try to parse out the line number
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try {
std::istringstream istr1(suppression.fileName.substr(pos+1));
istr1 >> suppression.lineNumber;
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} catch (...) {
suppression.lineNumber = Suppressions::Suppression::NO_LINE;
}
if (suppression.lineNumber != Suppressions::Suppression::NO_LINE) {
suppression.fileName.erase(pos);
}
}
}
}
suppression.fileName = Path::simplifyPath(suppression.fileName);
return addSuppression(std::move(suppression));
}
std::string Suppressions::addSuppression(Suppressions::Suppression suppression)
{
// Check if suppression is already in list
auto foundSuppression = std::find_if(mSuppressions.begin(), mSuppressions.end(),
std::bind(&Suppression::isSameParameters, &suppression, std::placeholders::_1));
if (foundSuppression != mSuppressions.end()) {
// Update matched state of existing global suppression
if (!suppression.isLocal() && suppression.matched)
foundSuppression->matched = suppression.matched;
return "";
}
// Check that errorId is valid..
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if (suppression.errorId.empty() && suppression.hash == 0)
return "Failed to add suppression. No id.";
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if (suppression.errorId != "*") {
for (std::string::size_type pos = 0; pos < suppression.errorId.length(); ++pos) {
if (suppression.errorId[pos] < 0 || !isAcceptedErrorIdChar(suppression.errorId[pos])) {
return "Failed to add suppression. Invalid id \"" + suppression.errorId + "\"";
}
if (pos == 0 && std::isdigit(suppression.errorId[pos])) {
return "Failed to add suppression. Invalid id \"" + suppression.errorId + "\"";
}
}
}
if (!isValidGlobPattern(suppression.errorId))
return "Failed to add suppression. Invalid glob pattern '" + suppression.errorId + "'.";
if (!isValidGlobPattern(suppression.fileName))
return "Failed to add suppression. Invalid glob pattern '" + suppression.fileName + "'.";
mSuppressions.push_back(std::move(suppression));
return "";
}
std::string Suppressions::addSuppressions(std::list<Suppression> suppressions)
{
for (auto &newSuppression : suppressions) {
auto errmsg = addSuppression(std::move(newSuppression));
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if (!errmsg.empty())
return errmsg;
}
return "";
}
void Suppressions::ErrorMessage::setFileName(std::string s)
{
mFileName = Path::simplifyPath(std::move(s));
}
bool Suppressions::Suppression::parseComment(std::string comment, std::string *errorMessage)
{
if (comment.size() < 2)
return false;
if (comment.find(';') != std::string::npos)
comment.erase(comment.find(';'));
if (comment.find("//", 2) != std::string::npos)
comment.erase(comment.find("//",2));
if (comment.compare(comment.size() - 2, 2, "*/") == 0)
comment.erase(comment.size() - 2, 2);
std::istringstream iss(comment.substr(2));
std::string word;
iss >> word;
if (word != "cppcheck-suppress")
return false;
iss >> errorId;
if (!iss)
return false;
while (iss) {
iss >> word;
if (!iss)
break;
if (word.find_first_not_of("+-*/%#;") == std::string::npos)
break;
if (startsWith(word,"symbolName="))
symbolName = word.substr(11);
else if (errorMessage && errorMessage->empty())
*errorMessage = "Bad suppression attribute '" + word + "'. You can write comments in the comment after a ; or //. Valid suppression attributes; symbolName=sym";
}
return true;
}
bool Suppressions::Suppression::isSuppressed(const Suppressions::ErrorMessage &errmsg) const
{
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if (hash > 0 && hash != errmsg.hash)
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return false;
if (!errorId.empty() && !matchglob(errorId, errmsg.errorId))
return false;
if (!fileName.empty() && !matchglob(fileName, errmsg.getFileName()))
return false;
if (lineNumber != NO_LINE && lineNumber != errmsg.lineNumber) {
if (!thisAndNextLine || lineNumber + 1 != errmsg.lineNumber)
return false;
}
if (!symbolName.empty()) {
for (std::string::size_type pos = 0; pos < errmsg.symbolNames.size();) {
const std::string::size_type pos2 = errmsg.symbolNames.find('\n',pos);
std::string symname;
if (pos2 == std::string::npos) {
symname = errmsg.symbolNames.substr(pos);
pos = pos2;
} else {
symname = errmsg.symbolNames.substr(pos,pos2-pos);
pos = pos2+1;
}
if (matchglob(symbolName, symname))
return true;
}
return false;
}
return true;
}
bool Suppressions::Suppression::isMatch(const Suppressions::ErrorMessage &errmsg)
{
if (!isSuppressed(errmsg))
return false;
matched = true;
checked = true;
return true;
}
std::string Suppressions::Suppression::getText() const
{
std::string ret;
if (!errorId.empty())
ret = errorId;
if (!fileName.empty())
ret += " fileName=" + fileName;
if (lineNumber != NO_LINE)
ret += " lineNumber=" + std::to_string(lineNumber);
if (!symbolName.empty())
ret += " symbolName=" + symbolName;
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if (hash > 0)
ret += " hash=" + std::to_string(hash);
if (startsWith(ret," "))
return ret.substr(1);
return ret;
}
bool Suppressions::isSuppressed(const Suppressions::ErrorMessage &errmsg, bool global)
{
const bool unmatchedSuppression(errmsg.errorId == "unmatchedSuppression");
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for (Suppression &s : mSuppressions) {
if (!global && !s.isLocal())
continue;
if (unmatchedSuppression && s.errorId != errmsg.errorId)
continue;
if (s.isMatch(errmsg))
return true;
}
return false;
}
bool Suppressions::isSuppressed(const ::ErrorMessage &errmsg)
{
if (mSuppressions.empty())
return false;
return isSuppressed(Suppressions::ErrorMessage::fromErrorMessage(errmsg));
}
void Suppressions::dump(std::ostream & out) const
{
out << " <suppressions>" << std::endl;
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for (const Suppression &suppression : mSuppressions) {
out << " <suppression";
out << " errorId=\"" << ErrorLogger::toxml(suppression.errorId) << '"';
if (!suppression.fileName.empty())
out << " fileName=\"" << ErrorLogger::toxml(suppression.fileName) << '"';
if (suppression.lineNumber != Suppression::NO_LINE)
out << " lineNumber=\"" << suppression.lineNumber << '"';
if (!suppression.symbolName.empty())
out << " symbolName=\"" << ErrorLogger::toxml(suppression.symbolName) << '\"';
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if (suppression.hash > 0)
out << " hash=\"" << suppression.hash << '\"';
out << " />" << std::endl;
}
out << " </suppressions>" << std::endl;
}
std::list<Suppressions::Suppression> Suppressions::getUnmatchedLocalSuppressions(const std::string &file, const bool unusedFunctionChecking) const
{
std::string tmpFile = Path::simplifyPath(file);
std::list<Suppression> result;
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for (const Suppression &s : mSuppressions) {
if (s.matched || ((s.lineNumber != Suppression::NO_LINE) && !s.checked))
continue;
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if (s.hash > 0)
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continue;
if (!unusedFunctionChecking && s.errorId == "unusedFunction")
continue;
if (tmpFile.empty() || !s.isLocal() || s.fileName != tmpFile)
continue;
result.push_back(s);
}
return result;
}
std::list<Suppressions::Suppression> Suppressions::getUnmatchedGlobalSuppressions(const bool unusedFunctionChecking) const
{
std::list<Suppression> result;
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for (const Suppression &s : mSuppressions) {
if (s.matched || ((s.lineNumber != Suppression::NO_LINE) && !s.checked))
continue;
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if (s.hash > 0)
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continue;
if (!unusedFunctionChecking && s.errorId == "unusedFunction")
continue;
if (s.isLocal())
continue;
result.push_back(s);
}
return result;
}
const std::list<Suppressions::Suppression> &Suppressions::getSuppressions() const
{
return mSuppressions;
}
void Suppressions::markUnmatchedInlineSuppressionsAsChecked(const Tokenizer &tokenizer) {
int currLineNr = -1;
int currFileIdx = -1;
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
if (currFileIdx != tok->fileIndex() || currLineNr != tok->linenr()) {
currLineNr = tok->linenr();
currFileIdx = tok->fileIndex();
for (auto &suppression : mSuppressions) {
if (!suppression.checked && (suppression.lineNumber == currLineNr) && (suppression.fileName == tokenizer.list.file(tok))) {
suppression.checked = true;
}
}
}
}
}
bool Suppressions::reportUnmatchedSuppressions(const std::list<Suppressions::Suppression> &unmatched, ErrorLogger &errorLogger)
{
bool err = false;
// Report unmatched suppressions
for (const Suppressions::Suppression &s : unmatched) {
// don't report "unmatchedSuppression" as unmatched
if (s.errorId == "unmatchedSuppression")
continue;
// check if this unmatched suppression is suppressed
bool suppressed = false;
for (const Suppressions::Suppression &s2 : unmatched) {
if (s2.errorId == "unmatchedSuppression") {
if ((s2.fileName.empty() || s2.fileName == "*" || s2.fileName == s.fileName) &&
(s2.lineNumber == Suppressions::Suppression::NO_LINE || s2.lineNumber == s.lineNumber)) {
suppressed = true;
break;
}
}
}
if (suppressed)
continue;
std::list<::ErrorMessage::FileLocation> callStack;
if (!s.fileName.empty())
callStack.emplace_back(s.fileName, s.lineNumber, 0);
errorLogger.reportErr(::ErrorMessage(callStack, emptyString, Severity::information, "Unmatched suppression: " + s.errorId, "unmatchedSuppression", Certainty::normal));
err = true;
}
return err;
}