cppcheck/lib/settings.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2023 Cppcheck team.
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*
* 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/>.
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*/
#include "settings.h"
#include "path.h"
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#include "summaries.h"
#include "vfvalue.h"
#include <fstream>
#include "json.h"
std::atomic<bool> Settings::mTerminated;
const char Settings::SafeChecks::XmlRootName[] = "safe-checks";
const char Settings::SafeChecks::XmlClasses[] = "class-public";
const char Settings::SafeChecks::XmlExternalFunctions[] = "external-functions";
const char Settings::SafeChecks::XmlInternalFunctions[] = "internal-functions";
const char Settings::SafeChecks::XmlExternalVariables[] = "external-variables";
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Settings::Settings()
{
severity.setEnabled(Severity::error, true);
certainty.setEnabled(Certainty::normal, true);
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setCheckLevelNormal();
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}
std::string Settings::loadCppcheckCfg()
{
static const std::string cfgFilename = "cppcheck.cfg";
std::string fileName;
#ifdef FILESDIR
if (Path::isFile(Path::join(FILESDIR, cfgFilename)))
fileName = Path::join(FILESDIR, cfgFilename);
#endif
// cppcheck-suppress knownConditionTrueFalse
if (fileName.empty()) {
fileName = Path::getPathFromFilename(exename) + cfgFilename;
if (!Path::isFile(fileName))
return "";
}
std::ifstream fin(fileName);
if (!fin.is_open())
return "could not open file";
picojson::value json;
fin >> json;
{
const std::string& lastErr = picojson::get_last_error();
if (!lastErr.empty())
return "not a valid JSON - " + lastErr;
}
const picojson::object& obj = json.get<picojson::object>();
{
const picojson::object::const_iterator it = obj.find("productName");
if (it != obj.cend()) {
const auto& v = it->second;
if (!v.is<std::string>())
return "'productName' is not a string";
cppcheckCfgProductName = v.get<std::string>();
}
}
{
const picojson::object::const_iterator it = obj.find("about");
if (it != obj.cend()) {
const auto& v = it->second;
if (!v.is<std::string>())
return "'about' is not a string";
cppcheckCfgAbout = v.get<std::string>();
}
}
{
const picojson::object::const_iterator it = obj.find("addons");
if (it != obj.cend()) {
const auto& entry = it->second;
if (!entry.is<picojson::array>())
return "'addons' is not an array";
for (const picojson::value &v : entry.get<picojson::array>())
{
if (!v.is<std::string>())
return "'addons' array entry is not a string";
const std::string &s = v.get<std::string>();
if (!Path::isAbsolute(s))
addons.emplace(Path::join(Path::getPathFromFilename(fileName), s));
else
addons.emplace(s);
}
}
}
{
const picojson::object::const_iterator it = obj.find("suppressions");
if (it != obj.cend()) {
const auto& entry = it->second;
if (!entry.is<picojson::array>())
return "'suppressions' is not an array";
for (const picojson::value &v : entry.get<picojson::array>())
{
if (!v.is<std::string>())
return "'suppressions' array entry is not a string";
const std::string &s = v.get<std::string>();
const std::string err = nomsg.addSuppressionLine(s);
if (!err.empty())
return "could not parse suppression '" + s + "' - " + err;
}
}
}
{
const picojson::object::const_iterator it = obj.find("safety");
if (it != obj.cend()) {
const auto& v = it->second;
if (!v.is<bool>())
return "'safety' is not a bool";
safety = v.get<bool>();
}
}
return "";
}
std::string Settings::parseEnabled(const std::string &str, std::tuple<SimpleEnableGroup<Severity>, SimpleEnableGroup<Checks>> &groups)
{
// Enable parameters may be comma separated...
if (str.find(',') != std::string::npos) {
std::string::size_type prevPos = 0;
std::string::size_type pos = 0;
while ((pos = str.find(',', pos)) != std::string::npos) {
if (pos == prevPos)
return std::string("--enable parameter is empty");
std::string errmsg(parseEnabled(str.substr(prevPos, pos - prevPos), groups));
if (!errmsg.empty())
return errmsg;
++pos;
prevPos = pos;
}
if (prevPos >= str.length())
return std::string("--enable parameter is empty");
return parseEnabled(str.substr(prevPos), groups);
}
auto& severity = std::get<0>(groups);
auto& checks = std::get<1>(groups);
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if (str == "all") {
// "error" is always enabled and cannot be controlled - so exclude it from "all"
SimpleEnableGroup<Severity> newSeverity;
newSeverity.fill();
newSeverity.disable(Severity::error);
severity.enable(newSeverity);
checks.enable(Checks::missingInclude);
checks.enable(Checks::unusedFunction);
} else if (str == "warning") {
severity.enable(Severity::warning);
} else if (str == "style") {
severity.enable(Severity::style);
} else if (str == "performance") {
severity.enable(Severity::performance);
} else if (str == "portability") {
severity.enable(Severity::portability);
} else if (str == "information") {
severity.enable(Severity::information);
} else if (str == "unusedFunction") {
checks.enable(Checks::unusedFunction);
} else if (str == "missingInclude") {
checks.enable(Checks::missingInclude);
}
#ifdef CHECK_INTERNAL
else if (str == "internal") {
checks.enable(Checks::internalCheck);
}
#endif
else {
// the actual option is prepending in the applyEnabled() call
if (str.empty())
return " parameter is empty";
return " parameter with the unknown name '" + str + "'";
}
return "";
}
std::string Settings::addEnabled(const std::string &str)
{
return applyEnabled(str, true);
}
std::string Settings::removeEnabled(const std::string &str)
{
return applyEnabled(str, false);
}
std::string Settings::applyEnabled(const std::string &str, bool enable)
{
std::tuple<SimpleEnableGroup<Severity>, SimpleEnableGroup<Checks>> groups;
std::string errmsg = parseEnabled(str, groups);
if (!errmsg.empty())
return (enable ? "--enable" : "--disable") + errmsg;
const auto s = std::get<0>(groups);
const auto c = std::get<1>(groups);
if (enable) {
severity.enable(s);
checks.enable(c);
}
else {
severity.disable(s);
checks.disable(c);
}
// FIXME: hack to make sure "error" is always enabled
severity.enable(Severity::error);
return errmsg;
}
bool Settings::isEnabled(const ValueFlow::Value *value, bool inconclusiveCheck) const
{
if (!severity.isEnabled(Severity::warning) && (value->condition || value->defaultArg))
return false;
if (!certainty.isEnabled(Certainty::inconclusive) && (inconclusiveCheck || value->isInconclusive()))
return false;
return true;
}
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void Settings::loadSummaries()
{
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Summaries::loadReturn(buildDir, summaryReturn);
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}
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void Settings::setCheckLevelExhaustive()
{
// Checking can take a little while. ~ 10 times slower than normal analysis is OK.
performanceValueFlowMaxIfCount = -1;
performanceValueFlowMaxSubFunctionArgs = 256;
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}
void Settings::setCheckLevelNormal()
{
// Checking should finish in reasonable time.
performanceValueFlowMaxSubFunctionArgs = 8;
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performanceValueFlowMaxIfCount = 100;
}