cppcheck/tools/reduce.cpp

285 lines
9.9 KiB
C++

#include <fstream>
#include <iostream>
#include <sstream>
#include <cstdlib>
#include <cstring>
#include "cppcheck.h"
class CppcheckExecutor : public ErrorLogger {
private:
CppCheck cppcheck;
std::string pattern;
bool foundLine;
public:
CppcheckExecutor(int linenr)
: ErrorLogger()
, cppcheck(*this,false)
, foundLine(false) {
std::ostringstream ostr;
ostr << linenr;
pattern = ":" + ostr.str() + "]";
cppcheck.settings().addEnabled("all");
cppcheck.settings().inconclusive = true;
cppcheck.settings()._force = true;
}
bool run(const char filename[]) {
foundLine = false;
cppcheck.check(filename);
return foundLine;
}
void reportOut(const std::string &outmsg) { }
void reportErr(const ErrorLogger::ErrorMessage &msg) {
if (msg.toString(false).find(pattern) != std::string::npos) {
foundLine = true;
cppcheck.terminate();
}
}
void reportProgress(const std::string &filename, const char stage[], const unsigned int value) { }
};
static bool test(const char *filename, int linenr, const std::vector<std::string> &filedata, const std::size_t line1, const std::size_t line2)
{
std::string path(filename);
if (path.find_first_of("\\/") != std::string::npos)
path = path.erase(1 + path.find_last_of("\\/"));
else
path.clear();
const std::string tempfilename(path + "__temp__" + std::strrchr(filename,'.'));
std::ofstream fout(tempfilename.c_str());
for (std::size_t i = 0; i < filedata.size(); i++)
fout << ((i>=line1 && i<=line2) ? "" : filedata[i]) << std::endl;
fout.close();
CppcheckExecutor cppcheck(linenr);
return cppcheck.run(tempfilename.c_str());
}
static bool test(const char *filename, int linenr, const std::vector<std::string> &filedata, const std::size_t line)
{
return test(filename, linenr, filedata, line, line);
}
static void printstr(const std::vector<std::string> &filedata, int i1, int i2)
{
std::cout << filedata.size();
for (int i = i1; i < i2; ++i)
std::cout << i << ":" << filedata[i] << std::endl;
}
static std::vector<std::string> readfile(const std::string &filename)
{
std::vector<std::string> filedata;
std::ifstream fin(filename.c_str());
std::string line;
bool blockComment = false;
while (std::getline(fin,line)) {
// replace various space characters with space
for (std::string::size_type pos = 0; pos < line.size(); ++pos) {
if (line[pos] & 0x80 || std::isspace(line[pos]))
line[pos] = ' ';
}
// remove block comments TODO: Handle /* inside strings
if (blockComment) {
if (line.find("*/") == std::string::npos)
line.clear();
else {
if (line.find("*/") + 2U == line.size())
line.clear();
else
line = line.substr(line.find("*/") + 2U);
blockComment = false;
}
}
while (!blockComment && line.find("/*") != std::string::npos) {
std::string::size_type pos = line.find("/*");
if (line.find("*/",pos) == std::string::npos) {
blockComment = true;
if (pos==0)
line.clear();
else
line = line.substr(0,pos);
} else {
blockComment = false;
line = line.erase(pos, 2U + line.find("*/", pos) - pos);
}
}
// Remove // comments
if (line.find("//") != std::string::npos)
line = line.substr(0, line.find("//"));
// empty line
if (line.find_first_not_of(" ") == std::string::npos)
line.clear();
else {
const std::string::size_type pos = line.find_first_not_of(" ");
// remove spaces before leading #
if (line[pos]=='#')
line = line.substr(pos);
}
// remove trailing spaces
while (!line.empty() && std::isspace(line[line.size()-1U]))
line = line.substr(0, line.size() - 1U);
filedata.push_back(line);
}
return filedata;
}
int main(int argc, char *argv[])
{
std::cout << "cppcheck tool that reduce code for a false positive" << std::endl;
if (argc != 3) {
std::cerr << "Syntax: " << argv[0] << " filename line" << std::endl;
return EXIT_FAILURE;
}
const char * const filename = argv[1];
int linenr = std::atoi(argv[2]);
std::cout << "make sure false positive can be reproduced" << std::endl;
// Execute Cppcheck on the file..
{
CppcheckExecutor cppcheck(linenr);
if (!cppcheck.run(filename)) {
std::cerr << "Can't reproduce false positive at line " << linenr << std::endl;
return EXIT_FAILURE;
}
}
// Read file..
std::vector<std::string> filedata(readfile(filename));
// Write resulting code..
if (!test(filename, linenr, 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(filename, linenr, 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(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());
linenr += data.size();
}
}
}
}
// Remove blocks of code..
for (std::size_t i = 0; i < filedata.size(); i++) {
const std::string line = (i==0U&&filedata.empty()) ? std::string(";") : filedata[i];
if (line.empty())
continue;
const char startChar = line[0];
const char endChar = line[line.size() - 1U];
// some kind of single line declaration
if (std::isalpha(startChar) && endChar==';') {
if (test(filename, linenr, filedata, i)) {
filedata[i].clear();
std::cout << "removed declaration at line " << i << std::endl;
} else {
std::cout << "kept declaration at line " << i << std::endl;
}
}
// remove a function body below a '}'
bool decl = bool(!std::isspace(startChar) && (endChar=='}' || endChar==';'));
while (decl) {
decl = false; // might be set to true below
std::size_t pos = ++i;
while (pos < filedata.size() && filedata[pos].empty())
++pos;
if ((pos+2U < filedata.size()) && (std::isalpha(filedata[pos].at(0)))) {
// does code block start with "{"
std::size_t pos2 = pos;
if (filedata[pos].find("(") != std::string::npos && filedata[pos].find(")")==std::string::npos) {
++pos2;
while (pos2+2U < filedata.size() && !filedata[pos2].empty() && filedata[pos2].find_first_of("(){}") == std::string::npos)
++pos2;
if (filedata[pos2].find_first_of("({}")!=std::string::npos || filedata[pos2].find(")") == std::string::npos)
break;
}
if (pos2+2U >= filedata.size() || filedata[pos2+1U] != "{")
break;
pos2 += 2;
// find end of block..
int level = 0;
while ((pos2 < filedata.size()) && (filedata[pos2].empty() || std::isspace(filedata[pos2].at(0)) || filedata[pos2].compare(0,3,"#if")==0 || filedata[pos2]=="#else" || filedata[pos2]=="#endif")) {
if (filedata[pos2].compare(0,3,"#if") == 0)
++level;
else if (filedata[pos2] == "#endif")
--level;
++pos2;
}
if (level != 0)
break;
// does block of code end with a '}'
if ((pos2 < filedata.size()) && (filedata[pos2] == "}" || filedata[pos2] == "};")) {
if (test(filename, linenr, filedata, pos, pos2)) {
for (i = pos; i <= pos2; i++)
filedata[i].clear();
std::cout << "removed block of code at lines " << pos << "-" << pos2 << std::endl;
decl = true;
} else {
std::cout << "kept block of code at lines " << pos << "-" << pos2 << std::endl;
}
}
}
}
}
// Write resulting code..
{
const std::string outfilename(std::string("__out__") + std::strrchr(filename,'.'));
std::ofstream fout(outfilename.c_str());
for (std::size_t i = 0; i < filedata.size(); i++) {
if (!filedata[i].empty())
fout << filedata[i] << std::endl;
}
}
return EXIT_SUCCESS;
}