cppcheck/src/preprocessor.cpp

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2009-01-23 22:34:03 +01:00
/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2009 Daniel Marjamäki, Reijo Tomperi, Nicolas Le Cam,
* Leandro Penz, Kimmo Varis
*
* 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 "preprocessor.h"
#include "tokenize.h"
#include "token.h"
#include <algorithm>
#include <sstream>
#include <fstream>
#include <iostream>
#include <cstdlib>
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#include <cctype>
Preprocessor::Preprocessor()
{
}
static char readChar(std::istream &istr)
{
char ch = (char)istr.get();
// Handling of newlines..
if (ch == '\r')
{
ch = '\n';
if ((char)istr.peek() == '\n')
(void)istr.get();
}
return ch;
}
/** Just read the code into a string. Perform simple cleanup of the code */
std::string Preprocessor::read(std::istream &istr)
{
// Get filedata from stream..
bool ignoreSpace = true;
// For the error report
int lineno = 1;
// handling <backspace><newline>
// when this is encountered the <backspace><newline> will be "skipped".
// on the next <newline>, extra newlines will be added
unsigned int newlines = 0;
std::ostringstream code;
for (char ch = readChar(istr); istr.good(); ch = readChar(istr))
{
if (ch < 0)
continue;
if (ch == '\n')
++lineno;
// Replace assorted special chars with spaces..
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if ((ch != '\n') && (std::isspace(ch) || std::iscntrl(ch)))
ch = ' ';
// Skip spaces after ' ' and after '#'
if (ch == ' ' && ignoreSpace)
continue;
ignoreSpace = bool(ch == ' ' || ch == '#' || ch == '/');
// Remove comments..
if (ch == '/')
{
char chNext = readChar(istr);
if (chNext == '/')
{
while (istr.good() && ch != '\n')
ch = readChar(istr);
code << "\n";
++lineno;
}
else if (chNext == '*')
{
char chPrev = 0;
while (istr.good() && (chPrev != '*' || ch != '/'))
{
chPrev = ch;
ch = readChar(istr);
if (ch == '\n')
{
code << "\n";
++lineno;
}
}
}
else
{
if (chNext == '\n')
++lineno;
code << std::string(1, ch) << std::string(1, chNext);
}
}
// String or char constants..
else if (ch == '\"' || ch == '\'')
{
code << std::string(1, ch);
char chNext;
do
{
chNext = (char)istr.get();
if (chNext == '\\')
{
char chSeq = readChar(istr);
if (chSeq == '\n')
++newlines;
else
{
code << std::string(1, chNext);
code << std::string(1, chSeq);
}
}
else
code << std::string(1, chNext);
}
while (istr.good() && chNext != ch);
}
// <backspace><newline>..
else if (ch == '\\')
{
char chNext = (char)istr.peek();
if (chNext == '\n' || chNext == '\r')
{
++newlines;
(void)readChar(istr); // Skip the "<backspace><newline>"
}
else
code << "\\";
}
// Just some code..
else
{
code << std::string(1, ch);
// if there has been <backspace><newline> sequences, add extra newlines..
if (ch == '\n' && newlines > 0)
{
code << std::string(newlines, '\n');
newlines = 0;
}
}
}
return code.str();
}
void Preprocessor::preprocess(std::istream &istr, std::map<std::string, std::string> &result, const std::string &filename, const std::list<std::string> &includePaths)
{
std::list<std::string> configs;
std::string data;
preprocess(istr, data, configs, filename, includePaths);
for (std::list<std::string>::const_iterator it = configs.begin(); it != configs.end(); ++it)
result[ *it ] = Preprocessor::getcode(data, *it);
}
std::string Preprocessor::removeSpaceNearNL(const std::string &str)
{
std::string tmp;
int prev = -1;
for (unsigned int i = 0; i < str.size(); i++)
{
if (str[i] == ' ' &&
((i > 0 && tmp[prev] == '\n') ||
(i + 1 < str.size() && str[i+1] == '\n')
)
)
{
// Ignore space that has new line in either side of it
}
else
{
tmp.append(1, str[i]);
++prev;
}
}
return tmp;
}
std::string Preprocessor::replaceIfDefined(const std::string &str)
{
std::string ret(str);
std::string::size_type pos = 0;
while ((pos = ret.find("#if defined(", pos)) != std::string::npos)
{
std::string::size_type pos2 = ret.find(")", pos + 9);
if (pos2 > ret.length() - 1)
break;
if (ret[pos2+1] == '\n')
{
ret.erase(pos2, 1);
ret.erase(pos + 3, 9);
ret.insert(pos + 3, "def ");
}
++pos;
}
return ret;
}
void Preprocessor::preprocess(std::istream &istr, std::string &processedFile, std::list<std::string> &resultConfigurations, const std::string &filename, const std::list<std::string> &includePaths)
{
processedFile = read(istr);
// Replace all tabs with spaces..
std::replace(processedFile.begin(), processedFile.end(), '\t', ' ');
// Remove all indentation..
if (!processedFile.empty() && processedFile[0] == ' ')
processedFile.erase(0, processedFile.find_first_not_of(" "));
// Remove space characters that are after or before new line character
processedFile = removeSpaceNearNL(processedFile);
handleIncludes(processedFile, filename, includePaths);
processedFile = replaceIfDefined(processedFile);
// Get all possible configurations..
resultConfigurations = getcfgs(processedFile);
}
// Get the DEF in this line: "#ifdef DEF"
std::string Preprocessor::getdef(std::string line, bool def)
{
// If def is true, the line must start with "#ifdef"
if (def && line.find("#ifdef ") != 0 && line.find("#if ") != 0 && line.find("#elif ") != 0)
{
return "";
}
// If def is false, the line must start with "#ifndef"
if (!def && line.find("#ifndef ") != 0)
{
return "";
}
// Remove the "#ifdef" or "#ifndef"
line.erase(0, line.find(" "));
// Remove all spaces.
while (line.find(" ") != std::string::npos)
line.erase(line.find(" "), 1);
// The remaining string is our result.
return line;
}
std::list<std::string> Preprocessor::getcfgs(const std::string &filedata)
{
std::list<std::string> ret;
ret.push_back("");
std::list<std::string> deflist;
// How deep into included files are we currently parsing?
// 0=>Source file, 1=>Included by source file, 2=>included by header that was included by source file, etc
int filelevel = 0;
std::istringstream istr(filedata);
std::string line;
while (getline(istr, line))
{
if (line.substr(0, 6) == "#file ")
{
++filelevel;
continue;
}
else if (line == "#endfile")
{
if (filelevel > 0)
--filelevel;
continue;
}
if (filelevel > 0)
continue;
std::string def = getdef(line, true) + getdef(line, false);
if (!def.empty())
{
if (! deflist.empty() && line.find("#elif ") == 0)
deflist.pop_back();
deflist.push_back(def);
def = "";
for (std::list<std::string>::const_iterator it = deflist.begin(); it != deflist.end(); ++it)
{
if (*it == "0")
break;
if (*it == "1")
continue;
if (! def.empty())
def += ";";
def += *it;
}
if (std::find(ret.begin(), ret.end(), def) == ret.end())
ret.push_back(def);
}
if (line.find("#else") == 0 && ! deflist.empty())
{
std::string def((deflist.back() == "1") ? "0" : "1");
deflist.pop_back();
deflist.push_back(def);
}
if (line.find("#endif") == 0 && ! deflist.empty())
deflist.pop_back();
}
return ret;
}
bool Preprocessor::match_cfg_def(std::string cfg, const std::string &def)
{
if (def == "0")
return false;
if (def == "1")
return true;
if (cfg.empty())
return false;
while (! cfg.empty())
{
if (cfg.find(";") == std::string::npos)
return bool(cfg == def);
std::string _cfg = cfg.substr(0, cfg.find(";"));
if (_cfg == def)
return true;
cfg.erase(0, cfg.find(";") + 1);
}
return false;
}
std::string Preprocessor::getcode(const std::string &filedata, std::string cfg)
{
std::ostringstream ret;
bool match = true;
std::list<bool> matching_ifdef;
std::list<bool> matched_ifdef;
std::istringstream istr(filedata);
std::string line;
while (getline(istr, line))
{
std::string def = getdef(line, true);
std::string ndef = getdef(line, false);
if (line.find("#elif ") == 0)
{
if (matched_ifdef.back())
{
matching_ifdef.back() = false;
}
else
{
if (match_cfg_def(cfg, def))
{
matching_ifdef.back() = true;
matched_ifdef.back() = true;
}
}
}
else if (! def.empty())
{
matching_ifdef.push_back(match_cfg_def(cfg, def));
matched_ifdef.push_back(matching_ifdef.back());
}
else if (! ndef.empty())
{
matching_ifdef.push_back(! match_cfg_def(cfg, ndef));
matched_ifdef.push_back(matching_ifdef.back());
}
else if (line == "#else")
{
if (! matched_ifdef.empty())
matching_ifdef.back() = ! matched_ifdef.back();
}
else if (line == "#endif")
{
if (! matched_ifdef.empty())
matched_ifdef.pop_back();
if (! matching_ifdef.empty())
matching_ifdef.pop_back();
}
if (!line.empty() && line[0] == '#')
{
match = true;
for (std::list<bool>::const_iterator it = matching_ifdef.begin(); it != matching_ifdef.end(); ++it)
match &= bool(*it);
}
if (! match)
line = "";
if (line.find("#if") == 0 ||
line.find("#else") == 0 ||
line.find("#elif") == 0 ||
line.find("#endif") == 0)
line = "";
ret << line << "\n";
}
return expandMacros(ret.str());
}
std::string Preprocessor::getHeaderFileName(const std::string &str)
{
std::string result;
std::string::size_type i = str.find("\"");
if (i == std::string::npos)
return result;
for (i = i + 1; i < str.length(); ++i)
{
if (str[i] == '"')
break;
result.append(1, str[i]);
}
return result;
}
void Preprocessor::handleIncludes(std::string &code, const std::string &filename, const std::list<std::string> &includePaths)
{
// std::string line;
std::string path = filename;
path.erase(1 + path.find_last_of("\\/"));
std::string::size_type pos = 0;
std::map<std::string, bool> handledFiles;
while ((pos = code.find("#include", pos)) != std::string::npos)
{
// Accept only includes that are at the start of a line
if (pos > 0 && code[pos-1] != '\n')
{
pos += 8; // length of "#include"
continue;
}
std::string::size_type end = code.find("\n", pos);
std::string filename = code.substr(pos, end - pos);
// Remove #include clause
code.erase(pos, end - pos);
filename = getHeaderFileName(filename);
if (filename.length() == 0)
continue;
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std::string tempFile = filename;
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std::transform(tempFile.begin(), tempFile.end(), tempFile.begin(), static_cast < int(*)(int) > (std::tolower));
if (handledFiles.find(tempFile) != handledFiles.end())
{
// We have processed this file already once, skip
// it this time to avoid ethernal loop.
continue;
}
handledFiles[ tempFile ] = true;
// filename contains now a file name e.g. "menu.h"
std::string processedFile;
for (std::list<std::string>::const_iterator iter = includePaths.begin(); iter != includePaths.end(); ++iter)
{
std::ifstream fin;
fin.open((*iter + filename).c_str());
if (fin.is_open())
{
filename = *iter + filename;
processedFile = Preprocessor::read(fin);
break;
}
}
if (processedFile.length() == 0)
{
filename = path + filename;
std::ifstream fin(filename.c_str());
processedFile = Preprocessor::read(fin);
}
if (processedFile.length() > 0)
{
// Replace all tabs with spaces..
std::replace(processedFile.begin(), processedFile.end(), '\t', ' ');
// Remove all indentation..
if (!processedFile.empty() && processedFile[0] == ' ')
processedFile.erase(0, processedFile.find_first_not_of(" "));
// Remove space characters that are after or before new line character
processedFile = removeSpaceNearNL(processedFile);
processedFile = "#file \"" + filename + "\"\n" + processedFile + "\n#endfile";
code.insert(pos, processedFile);
}
}
}
class Macro
{
private:
Tokenizer tokenizer;
std::vector<std::string> _params;
std::string _name;
std::string _macro;
public:
Macro(const std::string &macro)
: _macro(macro)
{
// Tokenize the macro to make it easier to handle
std::istringstream istr(macro.c_str());
tokenizer.tokenize(istr, "");
// macro name..
if (tokens() && tokens()->isName())
_name = tokens()->str();
std::string::size_type pos = macro.find_first_of(" (");
if (pos != std::string::npos && macro[pos] == '(')
{
// Extract macro parameters
if (Token::Match(tokens(), "%var% ( %var%"))
{
for (const Token *tok = tokens()->tokAt(2); tok; tok = tok->next())
{
if (tok->str() == ")")
break;
if (tok->isName())
_params.push_back(tok->str());
}
}
}
}
const Token *tokens() const
{
return tokenizer.tokens();
}
const std::vector<std::string> params() const
{
return _params;
}
const std::string &name() const
{
return _name;
}
const std::string code(const std::vector<std::string> &params2) const
{
std::string macrocode;
if (_params.empty())
{
std::string::size_type pos = _macro.find(" ");
if (pos == std::string::npos)
macrocode = "";
else
{
macrocode = _macro.substr(pos + 1);
if ((pos = macrocode.find_first_of("\r\n")) != std::string::npos)
macrocode.erase(pos);
}
}
else
{
const Token *tok = tokens();
while (tok && tok->str() != ")")
tok = tok->next();
if (tok)
{
while ((tok = tok->next()) != NULL)
{
std::string str = tok->str();
if (str == "##")
continue;
if (tok->isName())
{
for (unsigned int i = 0; i < _params.size(); ++i)
{
if (str == _params[i])
{
str = params2[i];
break;
}
}
}
macrocode += str;
if (Token::Match(tok, "%type% %var%"))
macrocode += " ";
}
}
}
return macrocode;
}
};
std::string Preprocessor::expandMacros(std::string code)
{
// Search for macros and expand them..
std::string::size_type defpos = 0;
while ((defpos = code.find("#define ", defpos)) != std::string::npos)
{
if (defpos > 0 && code[defpos-1] != '\n')
{
defpos += 6;
continue;
}
// Get macro..
std::string::size_type endpos = code.find("\n", defpos + 6);
if (endpos == std::string::npos)
{
code.erase(defpos);
break;
}
// Extract the whole macro into a separate variable "macro" and then erase it from "code"
const Macro macro(code.substr(defpos + 8, endpos - defpos - 7));
code.erase(defpos, endpos - defpos);
// No macro name => continue
if (macro.name() == "")
continue;
// Expand all macros in the code..
char pattern[5] = "\"'# ";
pattern[3] = macro.name().at(0);
std::string::size_type pos1 = defpos;
while ((pos1 = code.find_first_of(pattern, pos1 + 1)) != std::string::npos)
{
char ch = code[pos1];
// #undef => break
if (code[pos1] == '#')
{
// Are we at a #undef or #define?
if (code.substr(pos1, 7) == "#undef ")
pos1 += 7;
else if (code.substr(pos1, 8) == "#define ")
pos1 += 8;
else
continue;
// Compare the macroname with the macroname we're currently parsing (macro.name())
// If it's the same macroname.. break.
std::string::size_type pos = pos1 + macro.name().length();
if (pos < code.length()
&& code.substr(pos1, macro.name().length()) == macro.name()
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&& !std::isalnum(code[pos]) && code[pos] != '_')
break;
continue;
}
// String or char..
if (code[pos1] == '\"' || code[pos1] == '\'')
{
//char ch = code[pos1];
++pos1;
while (code[pos1] != ch)
{
if (code[pos1] == '\\')
++pos1;
++pos1;
if (!code[pos1])
{
// TODO, this code is here, because there is currently a bug in cppcheck
// Once it has been sorted out, this if can be removed
std::cout << "\n\n####### There is a bug in preprocessor.cpp that can cause crash, shutting down.\n\n" << std::endl;
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std::exit(0);
}
}
continue;
}
// Matching the macroname?
const std::string substr(code.substr(pos1, macro.name().length()));
if (code.substr(pos1, macro.name().length()) != macro.name())
continue;
// Previous char must not be alphanumeric or '_'
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if (pos1 != 0 && (std::isalnum(code[pos1-1]) || code[pos1-1] == '_'))
continue;
// The char after the macroname must not be alphanumeric or '_'
if (pos1 + macro.name().length() < code.length())
{
std::string::size_type pos2 = pos1 + macro.name().length();
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if (std::isalnum(code[pos2]) || code[pos2] == '_')
continue;
}
std::vector<std::string> params;
std::string::size_type pos2 = pos1 + macro.name().length();
if (macro.params().size() && pos2 >= code.length())
continue;
if (macro.params().size())
{
if (code[pos2] != '(')
continue;
int parlevel = 0;
std::string par;
for (; pos2 < code.length(); ++pos2)
{
if (code[pos2] == '(')
{
++parlevel;
if (parlevel == 1)
continue;
}
else if (code[pos2] == ')')
{
--parlevel;
if (parlevel <= 0)
{
params.push_back(par);
break;
}
}
else if (code[pos2] == '\"' || code[pos2] == '\'')
{
par += code[pos2];
char ch = code[pos2];
++pos2;
while (pos2 < code.length() && code[pos2] != ch)
{
par += code[pos2];
if (code[pos2] == '\\')
{
par += code[pos2];
++pos2;
}
++pos2;
}
if (pos2 == code.length())
break;
par += code[pos2];
continue;
}
if (parlevel == 1 && code[pos2] == ',')
{
params.push_back(par);
par = "";
}
else if (parlevel >= 1)
{
par += std::string(1, code[pos2]);
}
}
}
// Same number of parameters..
if (params.size() != macro.params().size())
continue;
// Create macro code..
const std::string macrocode(macro.code(params));
// Insert macro code..
if (!macro.params().empty())
++pos2;
code.erase(pos1, pos2 - pos1);
code.insert(pos1, macrocode);
pos1 += macrocode.length() - 1;
}
}
// Remove all #undef..
defpos = 0;
while ((defpos = code.find("\n#undef ", defpos)) != std::string::npos)
{
++defpos;
std::string::size_type pos2 = code.find("\n", defpos);
code.erase(defpos, pos2 - defpos);
}
return code;
}