685 lines
25 KiB
C++
685 lines
25 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2013 Daniel Marjamäki and 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 <fstream>
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#include <iostream>
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#include <sstream>
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#include <cstdlib>
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#include <cstring>
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#include <ctime>
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#include "cppcheck.h"
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#include "mathlib.h"
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class CppcheckExecutor : public ErrorLogger {
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private:
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CppCheck cppcheck;
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std::string pattern;
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bool foundLine;
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std::time_t stopTime;
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public:
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CppcheckExecutor(std::size_t linenr, bool hang)
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: ErrorLogger()
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, cppcheck(*this,false)
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, foundLine(false)
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, stopTime(0) {
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if (!hang)
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pattern = ":" + MathLib::longToString(linenr) + "]";
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cppcheck.settings().addEnabled("all");
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cppcheck.settings().inconclusive = true;
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cppcheck.settings()._force = true;
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}
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bool run(const char filename[], unsigned int maxtime) {
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foundLine = false;
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stopTime = std::time(0) + maxtime;
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cppcheck.check(filename);
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return foundLine;
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}
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void reportOut(const std::string &/*outmsg*/) { }
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void reportErr(const ErrorLogger::ErrorMessage &msg) {
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if (!pattern.empty() && msg.toString(false).find(pattern) != std::string::npos) {
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foundLine = true;
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cppcheck.terminate();
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}
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}
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void reportProgress(const std::string &filename, const char stage[], const std::size_t value) {
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if (std::time(0) > stopTime) {
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if (pattern.empty())
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foundLine = true;
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else
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std::cerr << "timeout. You might want to use a longer --maxtime timeout" << std::endl;
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std::cout << "terminate" << std::endl;
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cppcheck.terminate();
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}
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}
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};
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struct ReduceSettings {
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const char *filename;
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std::size_t linenr;
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bool hang;
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unsigned int maxtime;
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};
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static bool test(const ReduceSettings &settings, const std::vector<std::string> &filedata, const std::size_t line1, const std::size_t line2)
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{
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std::string path(settings.filename);
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if (path.find_first_of("\\/") != std::string::npos)
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path = path.erase(1 + path.find_last_of("\\/"));
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else
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path.clear();
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const std::string tempfilename(path + "__temp__" + std::strrchr(settings.filename,'.'));
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std::ofstream fout(tempfilename.c_str());
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for (std::size_t i = 0; i < filedata.size(); i++)
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fout << ((i>=line1 && i<=line2) ? "" : filedata[i]) << std::endl;
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fout.close();
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CppcheckExecutor cppcheck(settings.linenr, settings.hang);
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return cppcheck.run(tempfilename.c_str(), settings.maxtime);
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}
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static bool test(const ReduceSettings &settings, const std::vector<std::string> &filedata, const std::size_t line)
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{
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return test(settings, filedata, line, line);
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}
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static void printstr(const std::vector<std::string> &filedata, int i1, int i2)
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{
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std::cout << filedata.size();
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for (int i = i1; i < i2; ++i)
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std::cout << i << ":" << filedata[i] << std::endl;
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}
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static std::vector<std::string> readfile(const std::string &filename)
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{
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std::vector<std::string> filedata;
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std::ifstream fin(filename.c_str());
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std::string line;
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bool blockComment = false;
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while (std::getline(fin,line)) {
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// replace various space characters with space
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for (std::string::size_type pos = 0; pos < line.size(); ++pos) {
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if (line[pos] & 0x80 || std::isspace(line[pos]))
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line[pos] = ' ';
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}
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// remove block comments TODO: Handle /* inside strings
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if (blockComment) {
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if (line.find("*/") == std::string::npos)
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line.clear();
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else {
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if (line.find("*/") + 2U == line.size())
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line.clear();
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else
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line = line.substr(line.find("*/") + 2U);
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blockComment = false;
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}
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}
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while (!blockComment && line.find("/*") != std::string::npos) {
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std::string::size_type pos = line.find("/*");
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if (line.find("*/",pos) == std::string::npos) {
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blockComment = true;
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if (pos==0)
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line.clear();
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else
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line = line.substr(0,pos);
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} else {
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blockComment = false;
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line = line.erase(pos, 2U + line.find("*/", pos) - pos);
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}
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}
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// Remove // comments
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if (line.find("//") != std::string::npos)
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line = line.substr(0, line.find("//"));
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// empty line
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if (line.find_first_not_of(" ") == std::string::npos)
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line.clear();
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else {
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const std::string::size_type pos = line.find_first_not_of(" ");
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// remove spaces before leading #
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if (line[pos]=='#')
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line = line.substr(pos);
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}
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// remove trailing spaces
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while (!line.empty() && std::isspace(line[line.size()-1U]))
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line = line.substr(0, line.size() - 1U);
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filedata.push_back(line);
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}
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return filedata;
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}
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static bool removeMacrosInGlobalScope(const ReduceSettings &settings, std::vector<std::string> &filedata)
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{
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bool changed = false;
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// Remove macros in global scope..
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for (std::size_t i = 0; i < filedata.size(); i++) {
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const std::string line = (i==0U&&filedata.empty()) ? std::string(";") : filedata[i];
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if (line.empty())
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continue;
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const char startChar = line[0];
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const char endChar = line[line.size() - 1U];
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bool decl = bool(!std::isspace(startChar) && (endChar=='}' || endChar==';'));
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while (decl) {
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decl = false; // might be set to true below
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std::size_t pos = i + 1U;
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while (pos < filedata.size() && filedata[pos].empty())
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++pos;
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if (pos >= filedata.size())
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break;
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const std::string &s = filedata[pos]; // possible macro : make sure it matches '[A-Z0-9_]+\(.*\)'
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std::string::size_type si = 0;
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while (si < s.size() && ((s[si]>='A' && s[si]<='Z') || (i>0 && s[si]>='0' && s[si]<='9') || s[si]=='_'))
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si++;
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while (si < s.size() && std::isspace(s[si]))
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si++;
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if (si == 0U || si >= s.size() || s[si] != '(')
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break;
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si++;
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unsigned int parlevel = 1;
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while (si < s.size() && parlevel >= 1U) {
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if (s[si] == '(')
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++parlevel;
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else if (s[si] == ')')
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--parlevel;
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si++;
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}
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if (!(parlevel == 0U && si == s.size()))
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break;
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if (test(settings, filedata, pos)) {
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decl = true;
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filedata[pos].clear();
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std::cout << "removed declaration at line " << pos << std::endl;
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changed = true;
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} else {
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std::cout << "kept declaration at line " << pos << std::endl;
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}
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}
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}
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return changed;
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}
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static bool removeBlocksOfCode(const ReduceSettings &settings, std::vector<std::string> &filedata)
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{
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bool changed = false;
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// Remove blocks of code..
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for (std::size_t i = 0; i < filedata.size(); i++) {
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const std::string line = (i==0U&&filedata.empty()) ? std::string(";") : filedata[i];
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if (line.empty())
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continue;
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const char startChar = line[0];
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const char endChar = line[line.size() - 1U];
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// some kind of single line declaration
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if (std::isalpha(startChar) && endChar==';') {
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if (test(settings, filedata, i)) {
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filedata[i].clear();
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std::cout << "removed declaration at line " << i << std::endl;
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changed = true;
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} else {
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std::cout << "kept declaration at line " << i << std::endl;
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}
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}
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// remove a function body below a '}'
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bool decl = bool(!std::isspace(startChar) && (endChar=='}' || endChar==';'));
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while (decl) {
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decl = false; // might be set to true below
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std::size_t pos = ++i;
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while (pos < filedata.size() && filedata[pos].empty())
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++pos;
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if ((pos+2U < filedata.size()) && (std::isalpha(filedata[pos].at(0)))) {
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// does code block start with "{"
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std::size_t pos2 = pos;
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// struct X { ..
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if (filedata[pos].find_first_of("();}") == std::string::npos && filedata[pos].at(filedata[pos].size()-1U) == '{') {
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}
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// function declaration ..
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else {
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if (filedata[pos].find("(") != std::string::npos && filedata[pos].find(")")==std::string::npos) {
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++pos2;
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while (pos2+2U < filedata.size() && !filedata[pos2].empty() && filedata[pos2].find_first_of("(){}") == std::string::npos)
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++pos2;
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if (filedata[pos2].find_first_of("({}")!=std::string::npos || filedata[pos2].find(")") == std::string::npos)
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break;
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}
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pos2++;
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if (pos2 < filedata.size() && !filedata[pos2].empty() && filedata[pos2].at(filedata[pos2].find_first_not_of(" ")) == ':') {
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pos2++;
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while (pos2 < filedata.size() && !filedata[pos2].empty() && filedata[pos2].at(filedata[pos2].find_first_not_of(" ")) == ',')
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pos2++;
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}
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if (pos2+2U >= filedata.size() || filedata[pos2] != "{")
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break;
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}
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pos2++;
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// find end of block..
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int level = 0;
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while ((pos2 < filedata.size()) && (filedata[pos2].empty() || std::isspace(filedata[pos2].at(0)) || (std::isalpha(filedata[pos2].at(0)) && filedata[pos2].at(filedata[pos2].size()-1U) == ':') || filedata[pos2].compare(0,3,"#if")==0 || filedata[pos2].compare(0,3,"#el")==0 || filedata[pos2]=="#endif")) {
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if (filedata[pos2].compare(0,3,"#if") == 0)
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++level;
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else if (filedata[pos2] == "#endif")
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--level;
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++pos2;
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}
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if (level != 0)
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break;
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// does block of code end with a '}'
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if ((pos2 < filedata.size()) && (filedata[pos2] == "}" || filedata[pos2] == "};")) {
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if (test(settings, filedata, pos, pos2)) {
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for (i = pos; i <= pos2; i++)
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filedata[i].clear();
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std::cout << "removed block of code at lines " << pos << "-" << pos2 << std::endl;
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decl = true;
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changed = true;
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} else {
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std::cout << "kept block of code at lines " << pos << "-" << pos2 << std::endl;
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}
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}
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}
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}
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}
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return changed;
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}
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static bool removeClassAndStructMembers(const ReduceSettings &settings, std::vector<std::string> &filedata)
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{
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bool changed = false;
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// remove class and struct members
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for (std::size_t i = 0; i + 2U < filedata.size(); i++) {
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if ((filedata[i].compare(0,6,"class ")==0 || filedata[i].compare(0,7,"struct ")==0) && filedata[i].find(";")==std::string::npos && filedata[i+1]=="{") {
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bool decl = true;
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for (std::size_t pos = i+2U; pos < filedata.size(); pos++) {
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const std::string line = filedata[pos];
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if (line.empty())
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continue;
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// count { and }
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unsigned int c1=0, c2=0;
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for (std::string::size_type c = 0; c < line.size(); c++) {
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if (line[c] == '{')
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++c1;
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else if (line[c] == '}')
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++c2;
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}
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if (c2>0 && (c1!=1 || c2!=1))
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break;
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const char endChar = line[line.size() - 1U];
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if (decl && (endChar == ';' || (c1==1 && c2==1 && endChar=='}'))) {
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if (test(settings, filedata, pos)) {
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std::cout << "removed struct/class declaration at line " << pos << std::endl;
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filedata[pos].clear();
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changed = true;
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} else {
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std::cout << "kept struct/class declaration at line " << pos << std::endl;
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}
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}
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if (line[0] != '#') {
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if (decl && std::isalpha(line[0]) && endChar == ':') {
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decl = true;
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for (std::string::size_type linepos = 0U; linepos+1U < line.size(); ++linepos)
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decl &= (std::isspace(line[linepos]) || std::isalpha(line[linepos]));
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} else
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decl = bool(endChar == ';' || endChar == '}');
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}
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}
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}
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}
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return changed;
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}
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static bool removeIfEndIf(const ReduceSettings &settings, std::vector<std::string> &filedata)
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{
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bool changed = false;
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// #if - #endif
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for (std::size_t i = 0; i < filedata.size(); ++i) {
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while (filedata[i].compare(0,3,"#if") == 0) {
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std::size_t pos2 = i + 1;
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while (pos2 < filedata.size() && filedata[pos2].empty())
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++pos2;
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if (pos2 < filedata.size() && filedata[pos2] == "#endif") {
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if (test(settings, filedata, i, pos2)) {
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std::cout << "Removed #if - #endif block at lines " << i << "-" << pos2 << std::endl;
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filedata[i].clear();
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filedata[pos2].clear();
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i = 0;
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changed = true;
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} else {
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std::cout << "Kept #if - #endif block at lines " << i << "-" << pos2 << std::endl;
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break;
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}
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} else {
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break;
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}
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}
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}
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// #ifndef UNUSED_ID
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for (std::size_t i = 0; i < filedata.size(); ++i) {
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if (filedata[i].compare(0,8,"#ifndef ") == 0) {
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bool erase = true;
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bool def = false;
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const std::string id(filedata[i].substr(8));
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for (std::size_t i2 = 0; i2 < filedata.size(); i2++) {
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if (i2 == i)
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continue;
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if (filedata[i2].find(id) != std::string::npos) {
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if (!def && filedata[i2].compare(0,8,"#define ")==0)
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def = true;
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else
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erase = false;
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}
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}
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if (erase) {
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unsigned int level = 0;
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for (std::size_t i2 = i + 1U; i2 < filedata.size(); i2++) {
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if (filedata[i2].compare(0,3,"#if")==0)
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++level;
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else if (filedata[i2] == "#else")
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break;
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else if (filedata[i2] == "#endif") {
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if (level > 0)
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--level;
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else {
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std::vector<std::string> filedata2(filedata);
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filedata2[i].clear();
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filedata2[i2].clear();
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if (test(settings, filedata2, i)) {
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std::cout << "Removed #ifndef at line " << i << std::endl;
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filedata.swap(filedata2);
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changed = true;
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} else {
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std::cout << "Kept #ifndef at line " << i << std::endl;
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break;
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}
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break;
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}
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}
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}
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}
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}
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}
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return changed;
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}
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static bool removeUnusedDefines(const ReduceSettings &settings, std::vector<std::string> &filedata)
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{
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bool changed = false;
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for (std::size_t i = 0; i < filedata.size(); ++i) {
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if (filedata[i].compare(0,8,"#define ")==0 && filedata[i].find("\\")==std::string::npos) {
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// Try to remove macro..
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if (test(settings, filedata, i)) {
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std::cout << "Removed #define at line " << i << std::endl;
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filedata[i].clear();
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changed = true;
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} else {
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std::cout << "Kept #define at line " << i << std::endl;
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}
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}
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}
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return changed;
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}
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static bool removeSingleLines(const ReduceSettings &settings, std::vector<std::string> &filedata)
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{
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bool changed = false;
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bool decl = true;
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for (std::size_t i = 0; i < filedata.size(); ++i) {
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const std::string line = filedata[i];
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if (line.empty())
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continue;
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const char endChar = line[line.size() - 1U];
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if (decl && endChar == ';') {
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if (test(settings, filedata, i)) {
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std::cout << "Removed statement at line " << i << std::endl;
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filedata[i].clear();
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} else {
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std::cout << "Kept statement at line " << i << std::endl;
|
|
}
|
|
} else {
|
|
decl = bool (endChar == ';' || endChar == '{' || endChar == '}');
|
|
}
|
|
}
|
|
|
|
return changed;
|
|
}
|
|
|
|
// Try to remove stuff from statements
|
|
static bool cleanupStatements(const ReduceSettings &settings, std::vector<std::string> &filedata)
|
|
{
|
|
bool changed = false;
|
|
|
|
for (std::size_t i = 0; i < filedata.size(); ++i) {
|
|
std::string line = filedata[i];
|
|
if (line.empty())
|
|
continue;
|
|
|
|
for (std::string::size_type pos = 0U; pos < line.size(); ++pos) {
|
|
|
|
// function parameter..
|
|
if (std::strchr("(,", line[pos])) {
|
|
const std::string::size_type pos1 = (line[pos] == ',') ? pos : (pos + 1U);
|
|
std::string::size_type pos2 = pos + 1;
|
|
while (pos2 < line.size() && std::isspace(line[pos2]))
|
|
++pos2;
|
|
while (pos2 < line.size() && (std::isalnum(line[pos2]) || line[pos2]=='_'))
|
|
++pos2;
|
|
while (pos2 < line.size() && std::isspace(line[pos2]))
|
|
++pos2;
|
|
if (pos2 >= pos+2U && pos2<line.size() && std::strchr(",)", line[pos2])) {
|
|
const std::string backup(filedata[i]);
|
|
filedata[i] = line.substr(0,pos) + line.substr(pos2);
|
|
if (test(settings, filedata, ~0U)) {
|
|
std::cout << "Removed function parameter at line " << i << ", column " << pos1 << std::endl;
|
|
line = filedata[i];
|
|
changed = true;
|
|
continue;
|
|
} else {
|
|
std::cout << "Kept function parameter at line " << i << ", column " << pos1 << std::endl;
|
|
filedata[i] = backup;
|
|
}
|
|
}
|
|
}
|
|
|
|
// cast
|
|
if (line[pos] == '=' || line[pos] == '(') {
|
|
const std::string::size_type pos1 = pos + 1;
|
|
std::string::size_type pos2 = pos + 1;
|
|
while (pos2 < line.size() && std::isspace(line[pos2]))
|
|
++pos2;
|
|
if (pos2>=line.size() || line[pos2]!='(')
|
|
continue;
|
|
pos2++;
|
|
while (pos2 < line.size() && std::isalpha(line[pos2]))
|
|
++pos2;
|
|
while (pos2 < line.size() && std::isspace(line[pos2]))
|
|
++pos2;
|
|
if (pos2>=line.size() || line[pos2]!='*')
|
|
continue;
|
|
while (pos2 < line.size() && line[pos2]=='*')
|
|
++pos2;
|
|
if (pos2<line.size() && line[pos2]==')') {
|
|
pos2++;
|
|
const std::string backup(filedata[i]);
|
|
filedata[i] = line.substr(0,pos1) + line.substr(pos2);
|
|
if (test(settings, filedata, ~0U)) {
|
|
std::cout << "Removed cast at line " << i << ", column " << pos1 << std::endl;
|
|
line = filedata[i];
|
|
changed = true;
|
|
} else {
|
|
std::cout << "Kept cast at line " << i << ", column " << pos1 << std::endl;
|
|
filedata[i] = backup;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return changed;
|
|
}
|
|
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
std::cout << "cppcheck tool that reduce code for a hang / false positive" << std::endl;
|
|
|
|
bool print = false;
|
|
struct ReduceSettings settings = {0};
|
|
settings.maxtime = 300; // default timeout = 5 minutes
|
|
|
|
for (int i = 1; i < argc; i++) {
|
|
if (strcmp(argv[i], "--stdout") == 0)
|
|
print = true;
|
|
else if (strcmp(argv[i], "--hang") == 0) {
|
|
settings.hang = true;
|
|
} else if (strncmp(argv[i], "--maxtime=", 10) == 0)
|
|
settings.maxtime = std::atoi(argv[i] + 10);
|
|
else if (settings.filename==NULL && strchr(argv[i],'.'))
|
|
settings.filename = argv[i];
|
|
else if (settings.linenr == 0U && MathLib::isInt(argv[i]))
|
|
settings.linenr = std::atoi(argv[i]);
|
|
else {
|
|
std::cerr << "invalid option " << argv[i] << std::endl;
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
|
|
if ((!settings.hang && settings.linenr == 0U) || settings.filename == NULL) {
|
|
std::cerr << "Syntax:" << std::endl
|
|
<< argv[0] << " [--stdout] [--hang] filename [linenr]" << std::endl;
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
std::cout << "make sure " << (settings.hang ? "hang" : "false positive") << " can be reproduced" << std::endl;
|
|
|
|
// Execute Cppcheck on the file..
|
|
{
|
|
CppcheckExecutor cppcheck(settings.linenr, settings.hang);
|
|
if (!cppcheck.run(settings.filename, settings.maxtime)) {
|
|
std::cerr << "Can't reproduce false positive at line " << settings.linenr << std::endl;
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
|
|
// Read file..
|
|
std::vector<std::string> filedata(readfile(settings.filename));
|
|
|
|
// Write resulting code..
|
|
if (!test(settings, filedata, ~0)) {
|
|
std::cerr << "Cleanup failed." << std::endl;
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
// Remove includes..
|
|
std::set<std::string> headers;
|
|
for (std::size_t i = 0; i < filedata.size(); i++) {
|
|
if (filedata[i].compare(0,8,"#include")==0) {
|
|
if (test(settings, filedata, i)) {
|
|
std::cout << "removed #include : " << filedata[i] << std::endl;
|
|
filedata[i].clear();
|
|
} else {
|
|
std::string header = filedata[i];
|
|
header = header.substr(1U + header.find_first_of("\"<"));
|
|
header = header.erase(header.find_last_of("\">"));
|
|
if (headers.find(header) != headers.end()) {
|
|
std::cerr << "Failed to reduce headers" << std::endl;
|
|
return EXIT_FAILURE;
|
|
}
|
|
headers.insert(header);
|
|
std::string path(settings.filename);
|
|
if (path.find_first_of("\\/") != std::string::npos)
|
|
path = path.erase(1 + path.find_last_of("\\/"));
|
|
else
|
|
path.clear();
|
|
std::cout << "expand #include : " << (path+header) << std::endl;
|
|
std::vector<std::string> data(readfile(path+header));
|
|
if (!data.empty()) {
|
|
filedata[i].clear();
|
|
filedata.insert(filedata.begin()+i, data.begin(), data.end());
|
|
settings.linenr += data.size();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
bool changed = true;
|
|
while (changed) {
|
|
changed = false;
|
|
changed |= removeMacrosInGlobalScope(settings,filedata);
|
|
changed |= removeBlocksOfCode(settings,filedata);
|
|
changed |= removeClassAndStructMembers(settings,filedata);
|
|
changed |= removeIfEndIf(settings,filedata);
|
|
changed |= removeUnusedDefines(settings,filedata);
|
|
|
|
if (settings.hang) {
|
|
changed |= removeSingleLines(settings,filedata);
|
|
changed |= cleanupStatements(settings,filedata);
|
|
}
|
|
}
|
|
|
|
// Write resulting code..
|
|
{
|
|
const std::string outfilename(std::string("__out__") + std::strrchr(settings.filename,'.'));
|
|
std::ofstream fout;
|
|
if (!print)
|
|
fout.open(outfilename.c_str());
|
|
std::ostream &os = print ? std::cout : fout;
|
|
for (std::size_t i = 0; i < filedata.size(); i++) {
|
|
if (!filedata[i].empty())
|
|
os << filedata[i] << std::endl;
|
|
}
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|