cppcheck/lib/preprocessor.cpp

/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2020 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 "preprocessor.h"

#include "errorlogger.h"
#include "library.h"
#include "path.h"
#include "settings.h"
#include "simplecpp.h"
#include "suppressions.h"

#include <algorithm>
#include <cstdint>
#include <cstring>
#include <iterator> // back_inserter
#include <utility>

static bool sameline(const simplecpp::Token *tok1, const simplecpp::Token *tok2)
{
    return tok1 && tok2 && tok1->location.sameline(tok2->location);
}

/**
 * Remove heading and trailing whitespaces from the input parameter.
 * If string is all spaces/tabs, return empty string.
 * @param s The string to trim.
 */
static std::string trim(const std::string& s)
{
    const std::string::size_type beg = s.find_first_not_of(" \t");
    if (beg == std::string::npos)
        return "";
    const std::string::size_type end = s.find_last_not_of(" \t");
    return s.substr(beg, end - beg + 1);
}

Directive::Directive(const std::string &_file, const int _linenr, const std::string &_str):
    file(_file),
    linenr(_linenr),
    str(trim(_str))
{
}

std::atomic<bool> Preprocessor::missingIncludeFlag;
std::atomic<bool> Preprocessor::missingSystemIncludeFlag;

char Preprocessor::macroChar = char(1);

Preprocessor::Preprocessor(Settings& settings, ErrorLogger *errorLogger) : mSettings(settings), mErrorLogger(errorLogger)
{
}

Preprocessor::~Preprocessor()
{
    for (std::pair<const std::string, simplecpp::TokenList *>& tokenList : mTokenLists)
        delete tokenList.second;
}

namespace {
    struct BadInlineSuppression {
        BadInlineSuppression(const simplecpp::Location &l, const std::string &msg) : location(l), errmsg(msg) {}
        simplecpp::Location location;
        std::string errmsg;
    };
}

static bool parseInlineSuppressionCommentToken(const simplecpp::Token *tok, std::list<Suppressions::Suppression> &inlineSuppressions, std::list<BadInlineSuppression> *bad)
{
    const std::string cppchecksuppress("cppcheck-suppress");

    const std::string &comment = tok->str();
    if (comment.size() < cppchecksuppress.size())
        return false;
    const std::string::size_type pos1 = comment.find_first_not_of("/* \t");
    if (pos1 == std::string::npos)
        return false;
    if (pos1 + cppchecksuppress.size() >= comment.size())
        return false;
    if (comment.substr(pos1, cppchecksuppress.size()) != cppchecksuppress)
        return false;

    // skip spaces after "cppcheck-suppress"
    const std::string::size_type pos2 = comment.find_first_not_of(" ", pos1+17);
    if (pos2 == std::string::npos)
        return false;

    if (comment[pos2] == '[') {
        // multi suppress format
        std::string errmsg;
        std::vector<Suppressions::Suppression> suppressions = Suppressions::parseMultiSuppressComment(comment, &errmsg);

        if (!errmsg.empty())
            bad->push_back(BadInlineSuppression(tok->location, errmsg));

        for (const Suppressions::Suppression &s : suppressions) {
            if (!s.errorId.empty())
                inlineSuppressions.push_back(s);
        }
    } else {
        //single suppress format
        std::string errmsg;
        Suppressions::Suppression s;
        if (!s.parseComment(comment, &errmsg))
            return false;

        if (!s.errorId.empty())
            inlineSuppressions.push_back(s);

        if (!errmsg.empty())
            bad->push_back(BadInlineSuppression(tok->location, errmsg));
    }

    return true;
}

static void inlineSuppressions(const simplecpp::TokenList &tokens, Settings &mSettings, std::list<BadInlineSuppression> *bad)
{
    for (const simplecpp::Token *tok = tokens.cfront(); tok; tok = tok->next) {
        if (!tok->comment)
            continue;

        std::list<Suppressions::Suppression> inlineSuppressions;
        if (!parseInlineSuppressionCommentToken(tok, inlineSuppressions, bad))
            continue;

        if (!sameline(tok->previous, tok)) {
            // find code after comment..
            tok = tok->next;
            while (tok && tok->comment) {
                parseInlineSuppressionCommentToken(tok, inlineSuppressions, bad);
                tok = tok->next;
            }
            if (!tok)
                break;
        }

        if (inlineSuppressions.empty())
            continue;

        // Relative filename
        std::string relativeFilename(tok->location.file());
        if (mSettings.relativePaths) {
            for (const std::string & basePath : mSettings.basePaths) {
                const std::string bp = basePath + "/";
                if (relativeFilename.compare(0,bp.size(),bp)==0) {
                    relativeFilename = relativeFilename.substr(bp.size());
                }
            }
        }
        relativeFilename = Path::simplifyPath(relativeFilename);

        // Add the suppressions.
        for (Suppressions::Suppression &suppr : inlineSuppressions) {
            suppr.fileName = relativeFilename;
            suppr.lineNumber = tok->location.line;
            mSettings.nomsg.addSuppression(suppr);
        }
    }
}

void Preprocessor::inlineSuppressions(const simplecpp::TokenList &tokens)
{
    if (!mSettings.inlineSuppressions)
        return;
    std::list<BadInlineSuppression> err;
    ::inlineSuppressions(tokens, mSettings, &err);
    for (std::map<std::string,simplecpp::TokenList*>::const_iterator it = mTokenLists.begin(); it != mTokenLists.end(); ++it) {
        if (it->second)
            ::inlineSuppressions(*it->second, mSettings, &err);
    }
    for (const BadInlineSuppression &bad : err) {
        error(bad.location.file(), bad.location.line, bad.errmsg);
    }
}

void Preprocessor::setDirectives(const simplecpp::TokenList &tokens)
{
    // directive list..
    mDirectives.clear();

    std::vector<const simplecpp::TokenList *> list;
    list.reserve(1U + mTokenLists.size());
    list.push_back(&tokens);
    for (std::map<std::string, simplecpp::TokenList *>::const_iterator it = mTokenLists.begin(); it != mTokenLists.end(); ++it) {
        list.push_back(it->second);
    }

    for (const simplecpp::TokenList *tokenList : list) {
        for (const simplecpp::Token *tok = tokenList->cfront(); tok; tok = tok->next) {
            if ((tok->op != '#') || (tok->previous && tok->previous->location.line == tok->location.line))
                continue;
            if (tok->next && tok->next->str() == "endfile")
                continue;
            Directive directive(tok->location.file(), tok->location.line, emptyString);
            for (const simplecpp::Token *tok2 = tok; tok2 && tok2->location.line == directive.linenr; tok2 = tok2->next) {
                if (tok2->comment)
                    continue;
                if (!directive.str.empty() && (tok2->location.col > tok2->previous->location.col + tok2->previous->str().size()))
                    directive.str += ' ';
                if (directive.str == "#" && tok2->str() == "file")
                    directive.str += "include";
                else
                    directive.str += tok2->str();
            }
            mDirectives.push_back(directive);
        }
    }
}

static std::string readcondition(const simplecpp::Token *iftok, const std::set<std::string> &defined, const std::set<std::string> &undefined)
{
    const simplecpp::Token *cond = iftok->next;
    if (!sameline(iftok,cond))
        return "";

    const simplecpp::Token *next1 = cond->next;
    const simplecpp::Token *next2 = next1 ? next1->next : nullptr;
    const simplecpp::Token *next3 = next2 ? next2->next : nullptr;

    unsigned int len = 1;
    if (sameline(iftok,next1))
        len = 2;
    if (sameline(iftok,next2))
        len = 3;
    if (sameline(iftok,next3))
        len = 4;

    if (len == 1 && cond->str() == "0")
        return "0";

    if (len == 1 && cond->name) {
        if (defined.find(cond->str()) == defined.end())
            return cond->str();
    }

    if (len == 2 && cond->op == '!' && next1->name) {
        if (defined.find(next1->str()) == defined.end())
            return next1->str() + "=0";
    }

    if (len == 3 && cond->op == '(' && next1->name && next2->op == ')') {
        if (defined.find(next1->str()) == defined.end() && undefined.find(next1->str()) == undefined.end())
            return next1->str();
    }

    if (len == 3 && cond->name && next1->str() == "==" && next2->number) {
        if (defined.find(cond->str()) == defined.end())
            return cond->str() + '=' + cond->next->next->str();
    }

    std::set<std::string> configset;
    for (; sameline(iftok,cond); cond = cond->next) {
        if (cond->op == '!') {
            if (!sameline(iftok,cond->next) || !cond->next->name)
                break;
            if (cond->next->str() == "defined")
                continue;
            configset.insert(cond->next->str() + "=0");
            continue;
        }
        if (cond->str() != "defined")
            continue;
        const simplecpp::Token *dtok = cond->next;
        if (!dtok)
            break;
        if (dtok->op == '(')
            dtok = dtok->next;
        if (sameline(iftok,dtok) && dtok->name && defined.find(dtok->str()) == defined.end() && undefined.find(dtok->str()) == undefined.end())
            configset.insert(dtok->str());
    }
    std::string cfg;
    for (const std::string &s : configset) {
        if (!cfg.empty())
            cfg += ';';
        cfg += s;
    }
    return cfg;
}

static bool hasDefine(const std::string &userDefines, const std::string &cfg)
{
    if (cfg.empty()) {
        return false;
    }

    std::string::size_type pos = 0;
    while (pos < userDefines.size()) {
        pos = userDefines.find(cfg, pos);
        if (pos == std::string::npos)
            break;
        const std::string::size_type pos2 = pos + cfg.size();
        if ((pos == 0 || userDefines[pos-1U] == ';') && (pos2 == userDefines.size() || userDefines[pos2] == '='))
            return true;
        pos = pos2;
    }
    return false;
}

static std::string cfg(const std::vector<std::string> &configs, const std::string &userDefines)
{
    std::set<std::string> configs2(configs.begin(), configs.end());
    std::string ret;
    for (const std::string &cfg : configs2) {
        if (cfg.empty())
            continue;
        if (cfg == "0")
            return "";
        if (hasDefine(userDefines, cfg))
            continue;
        if (!ret.empty())
            ret += ';';
        ret += cfg;
    }
    return ret;
}

static bool isUndefined(const std::string &cfg, const std::set<std::string> &undefined)
{
    for (std::string::size_type pos1 = 0U; pos1 < cfg.size();) {
        const std::string::size_type pos2 = cfg.find(';',pos1);
        const std::string def = (pos2 == std::string::npos) ? cfg.substr(pos1) : cfg.substr(pos1, pos2 - pos1);

        const std::string::size_type eq = def.find('=');
        if (eq == std::string::npos && undefined.find(def) != undefined.end())
            return true;
        if (eq != std::string::npos && undefined.find(def.substr(0,eq)) != undefined.end() && def.substr(eq) != "=0")
            return true;

        pos1 = (pos2 == std::string::npos) ? pos2 : pos2 + 1U;
    }
    return false;
}

static bool getConfigsElseIsFalse(const std::vector<std::string> &configs_if, const std::string &userDefines)
{
    return std::any_of(configs_if.cbegin(), configs_if.cend(),
    [=](const std::string &cfg) {
        return hasDefine(userDefines, cfg);
    });
}

static const simplecpp::Token *gotoEndIf(const simplecpp::Token *cmdtok)
{
    int level = 0;
    while (nullptr != (cmdtok = cmdtok->next)) {
        if (cmdtok->op == '#' && !sameline(cmdtok->previous,cmdtok) && sameline(cmdtok, cmdtok->next)) {
            if (cmdtok->next->str().compare(0,2,"if")==0)
                ++level;
            else if (cmdtok->next->str() == "endif") {
                --level;
                if (level < 0)
                    return cmdtok;
            }
        }
    }
    return nullptr;
}

static void getConfigs(const simplecpp::TokenList &tokens, std::set<std::string> &defined, const std::string &userDefines, const std::set<std::string> &undefined, std::set<std::string> &ret)
{
    std::vector<std::string> configs_if;
    std::vector<std::string> configs_ifndef;
    std::string elseError;

    for (const simplecpp::Token *tok = tokens.cfront(); tok; tok = tok->next) {
        if (tok->op != '#' || sameline(tok->previous, tok))
            continue;
        const simplecpp::Token *cmdtok = tok->next;
        if (!sameline(tok, cmdtok))
            continue;
        if (cmdtok->str() == "ifdef" || cmdtok->str() == "ifndef" || cmdtok->str() == "if") {
            std::string config;
            if (cmdtok->str() == "ifdef" || cmdtok->str() == "ifndef") {
                const simplecpp::Token *expr1 = cmdtok->next;
                if (sameline(tok,expr1) && expr1->name && !sameline(tok,expr1->next))
                    config = expr1->str();
                if (defined.find(config) != defined.end())
                    config.clear();
            } else if (cmdtok->str() == "if") {
                config = readcondition(cmdtok, defined, undefined);
            }

            // skip undefined configurations..
            if (isUndefined(config, undefined))
                config.clear();

            configs_if.push_back((cmdtok->str() == "ifndef") ? std::string() : config);
            configs_ifndef.push_back((cmdtok->str() == "ifndef") ? config : std::string());
            ret.insert(cfg(configs_if,userDefines));
        } else if (cmdtok->str() == "elif" || cmdtok->str() == "else") {
            if (getConfigsElseIsFalse(configs_if,userDefines)) {
                tok = gotoEndIf(tok);
                if (!tok)
                    break;
                tok = tok->previous;
                continue;
            }
            if (cmdtok->str() == "else" &&
                cmdtok->next &&
                !sameline(cmdtok,cmdtok->next) &&
                sameline(cmdtok->next, cmdtok->next->next) &&
                cmdtok->next->op == '#' &&
                cmdtok->next->next->str() == "error") {
                const std::string &ifcfg = cfg(configs_if, userDefines);
                if (!ifcfg.empty()) {
                    if (!elseError.empty())
                        elseError += ';';
                    elseError += ifcfg;
                }
            }
            if (!configs_if.empty())
                configs_if.pop_back();
            if (cmdtok->str() == "elif") {
                std::string config = readcondition(cmdtok, defined, undefined);
                if (isUndefined(config,undefined))
                    config.clear();
                configs_if.push_back(config);
                ret.insert(cfg(configs_if, userDefines));
            } else if (!configs_ifndef.empty()) {
                configs_if.push_back(configs_ifndef.back());
                ret.insert(cfg(configs_if, userDefines));
            }
        } else if (cmdtok->str() == "endif" && !sameline(tok, cmdtok->next)) {
            if (!configs_if.empty())
                configs_if.pop_back();
            if (!configs_ifndef.empty())
                configs_ifndef.pop_back();
        } else if (cmdtok->str() == "error") {
            if (!configs_ifndef.empty() && !configs_ifndef.back().empty()) {
                if (configs_ifndef.size() == 1U)
                    ret.erase("");
                std::vector<std::string> configs(configs_if);
                configs.push_back(configs_ifndef.back());
                ret.erase(cfg(configs, userDefines));
                if (!elseError.empty())
                    elseError += ';';
                elseError += cfg(configs_ifndef, userDefines);
            }
            if (!configs_if.empty() && !configs_if.back().empty()) {
                const std::string &last = configs_if.back();
                if (last.size() > 2U && last.compare(last.size()-2U,2,"=0") == 0) {
                    std::vector<std::string> configs(configs_if);
                    ret.erase(cfg(configs, userDefines));
                    configs[configs.size() - 1U] = last.substr(0,last.size()-2U);
                    if (configs.size() == 1U)
                        ret.erase("");
                    if (!elseError.empty())
                        elseError += ';';
                    elseError += cfg(configs, userDefines);
                }
            }
        } else if (cmdtok->str() == "define" && sameline(tok, cmdtok->next) && cmdtok->next->name) {
            defined.insert(cmdtok->next->str());
        }
    }
    if (!elseError.empty())
        ret.insert(elseError);
}


std::set<std::string> Preprocessor::getConfigs(const simplecpp::TokenList &tokens) const
{
    std::set<std::string> ret = { "" };
    if (!tokens.cfront())
        return ret;

    std::set<std::string> defined = { "__cplusplus" };

    ::getConfigs(tokens, defined, mSettings.userDefines, mSettings.userUndefs, ret);

    for (std::map<std::string, simplecpp::TokenList*>::const_iterator it = mTokenLists.begin(); it != mTokenLists.end(); ++it) {
        if (!mSettings.configurationExcluded(it->first))
            ::getConfigs(*(it->second), defined, mSettings.userDefines, mSettings.userUndefs, ret);
    }

    return ret;
}


void Preprocessor::preprocess(std::istream &istr, std::map<std::string, std::string> &result, const std::string &filename, const std::list<std::string> &includePaths)
{
    (void)includePaths;

    simplecpp::OutputList outputList;
    std::vector<std::string> files;
    const simplecpp::TokenList tokens1(istr, files, filename, &outputList);

    const std::set<std::string> configs = getConfigs(tokens1);

    for (const std::string &cfg : configs) {
        if (mSettings.userUndefs.find(cfg) == mSettings.userUndefs.end()) {
            result[cfg] = getcode(tokens1, cfg, files, false);
        }
    }
}

std::string Preprocessor::removeSpaceNearNL(const std::string &str)
{
    std::string tmp;
    char prev = '\n'; // treat start of file as newline
    for (std::size_t i = 0; i < str.size(); i++) {
        if (str[i] == ' ' &&
            (prev == '\n' ||
             i + 1 >= str.size() || // treat end of file as newline
             str[i+1] == '\n'
            )
           ) {
            // Ignore space that has new line in either side of it
        } else {
            tmp.append(1, str[i]);
            prev = str[i];
        }
    }

    return tmp;
}

void Preprocessor::preprocessWhitespaces(std::string &processedFile)
{
    // Replace all tabs with spaces..
    std::replace(processedFile.begin(), processedFile.end(), '\t', ' ');

    // Remove space characters that are after or before new line character
    processedFile = removeSpaceNearNL(processedFile);
}

void Preprocessor::preprocess(std::istream &srcCodeStream, std::string &processedFile, std::list<std::string> &resultConfigurations, const std::string &filename, const std::list<std::string> &includePaths)
{
    (void)includePaths;

    if (mFile0.empty())
        mFile0 = filename;

    simplecpp::OutputList outputList;
    std::vector<std::string> files;
    const simplecpp::TokenList tokens1(srcCodeStream, files, filename, &outputList);

    const std::set<std::string> configs = getConfigs(tokens1);
    std::copy(configs.cbegin(), configs.cend(), std::back_inserter(resultConfigurations));

    processedFile = tokens1.stringify();
}

static void splitcfg(const std::string &cfg, std::list<std::string> &defines, const std::string &defaultValue)
{
    for (std::string::size_type defineStartPos = 0U; defineStartPos < cfg.size();) {
        const std::string::size_type defineEndPos = cfg.find(';', defineStartPos);
        std::string def = (defineEndPos == std::string::npos) ? cfg.substr(defineStartPos) : cfg.substr(defineStartPos, defineEndPos - defineStartPos);
        if (!defaultValue.empty() && def.find('=') == std::string::npos)
            def += '=' + defaultValue;
        defines.push_back(def);
        if (defineEndPos == std::string::npos)
            break;
        defineStartPos = defineEndPos + 1U;
    }
}

static simplecpp::DUI createDUI(const Settings &mSettings, const std::string &cfg, const std::string &filename)
{
    simplecpp::DUI dui;

    splitcfg(mSettings.userDefines, dui.defines, "1");
    if (!cfg.empty())
        splitcfg(cfg, dui.defines, emptyString);

    for (const std::string &def : mSettings.library.defines) {
        const std::string::size_type pos = def.find_first_of(" (");
        if (pos == std::string::npos) {
            dui.defines.push_back(def);
            continue;
        }
        std::string s = def;
        if (s[pos] == ' ') {
            s[pos] = '=';
        } else {
            s[s.find(')')+1] = '=';
        }
        dui.defines.push_back(s);
    }

    if (Path::isCPP(filename))
        dui.defines.emplace_back("__cplusplus");

    dui.undefined = mSettings.userUndefs; // -U
    dui.includePaths = mSettings.includePaths; // -I
    dui.includes = mSettings.userIncludes;  // --include
    return dui;
}

static bool hasErrors(const simplecpp::OutputList &outputList)
{
    for (simplecpp::OutputList::const_iterator it = outputList.begin(); it != outputList.end(); ++it) {
        switch (it->type) {
        case simplecpp::Output::ERROR:
        case simplecpp::Output::INCLUDE_NESTED_TOO_DEEPLY:
        case simplecpp::Output::SYNTAX_ERROR:
        case simplecpp::Output::UNHANDLED_CHAR_ERROR:
        case simplecpp::Output::EXPLICIT_INCLUDE_NOT_FOUND:
            return true;
        case simplecpp::Output::WARNING:
        case simplecpp::Output::MISSING_HEADER:
        case simplecpp::Output::PORTABILITY_BACKSLASH:
            break;
        }
    }
    return false;
}

void Preprocessor::handleErrors(const simplecpp::OutputList& outputList, bool throwError)
{
    const bool showerror = (!mSettings.userDefines.empty() && !mSettings.force);
    reportOutput(outputList, showerror);
    if (throwError) {
        for (const simplecpp::Output& output : outputList) {
            switch (output.type) {
            case simplecpp::Output::ERROR:
            case simplecpp::Output::INCLUDE_NESTED_TOO_DEEPLY:
            case simplecpp::Output::SYNTAX_ERROR:
            case simplecpp::Output::UNHANDLED_CHAR_ERROR:
            case simplecpp::Output::EXPLICIT_INCLUDE_NOT_FOUND:
                throw output;
            case simplecpp::Output::WARNING:
            case simplecpp::Output::MISSING_HEADER:
            case simplecpp::Output::PORTABILITY_BACKSLASH:
                break;
            }
        }
    }
}

bool Preprocessor::loadFiles(const simplecpp::TokenList &rawtokens, std::vector<std::string> &files)
{
    const simplecpp::DUI dui = createDUI(mSettings, emptyString, files[0]);

    simplecpp::OutputList outputList;
    mTokenLists = simplecpp::load(rawtokens, files, dui, &outputList);
    handleErrors(outputList, false);
    return !hasErrors(outputList);
}

void Preprocessor::removeComments()
{
    for (std::pair<const std::string, simplecpp::TokenList*>& tokenList : mTokenLists) {
        if (tokenList.second)
            tokenList.second->removeComments();
    }
}

void Preprocessor::setPlatformInfo(simplecpp::TokenList *tokens) const
{
    tokens->sizeOfType["bool"]          = mSettings.sizeof_bool;
    tokens->sizeOfType["short"]         = mSettings.sizeof_short;
    tokens->sizeOfType["int"]           = mSettings.sizeof_int;
    tokens->sizeOfType["long"]          = mSettings.sizeof_long;
    tokens->sizeOfType["long long"]     = mSettings.sizeof_long_long;
    tokens->sizeOfType["float"]         = mSettings.sizeof_float;
    tokens->sizeOfType["double"]        = mSettings.sizeof_double;
    tokens->sizeOfType["long double"]   = mSettings.sizeof_long_double;
    tokens->sizeOfType["bool *"]        = mSettings.sizeof_pointer;
    tokens->sizeOfType["short *"]       = mSettings.sizeof_pointer;
    tokens->sizeOfType["int *"]         = mSettings.sizeof_pointer;
    tokens->sizeOfType["long *"]        = mSettings.sizeof_pointer;
    tokens->sizeOfType["long long *"]   = mSettings.sizeof_pointer;
    tokens->sizeOfType["float *"]       = mSettings.sizeof_pointer;
    tokens->sizeOfType["double *"]      = mSettings.sizeof_pointer;
    tokens->sizeOfType["long double *"] = mSettings.sizeof_pointer;
}

simplecpp::TokenList Preprocessor::preprocess(const simplecpp::TokenList &tokens1, const std::string &cfg, std::vector<std::string> &files, bool throwError)
{
    const simplecpp::DUI dui = createDUI(mSettings, cfg, files[0]);

    simplecpp::OutputList outputList;
    std::list<simplecpp::MacroUsage> macroUsage;
    simplecpp::TokenList tokens2(files);
    simplecpp::preprocess(tokens2, tokens1, files, mTokenLists, dui, &outputList, &macroUsage);

    handleErrors(outputList, throwError);

    tokens2.removeComments();

    // ensure that guessed define macros without value are not used in the code
    if (!validateCfg(cfg, macroUsage))
        return simplecpp::TokenList(files);

    return tokens2;
}

std::string Preprocessor::getcode(const simplecpp::TokenList &tokens1, const std::string &cfg, std::vector<std::string> &files, const bool writeLocations)
{
    simplecpp::TokenList tokens2 = preprocess(tokens1, cfg, files, false);
    unsigned int prevfile = 0;
    unsigned int line = 1;
    std::ostringstream ret;
    for (const simplecpp::Token *tok = tokens2.cfront(); tok; tok = tok->next) {
        if (writeLocations && tok->location.fileIndex != prevfile) {
            ret << "\n#line " << tok->location.line << " \"" << tok->location.file() << "\"\n";
            prevfile = tok->location.fileIndex;
            line = tok->location.line;
        }

        if (tok->previous && line >= tok->location.line) // #7912
            ret << ' ';
        while (tok->location.line > line) {
            ret << '\n';
            line++;
        }
        if (!tok->macro.empty())
            ret << Preprocessor::macroChar;
        ret << tok->str();
    }

    return ret.str();
}

std::string Preprocessor::getcode(const std::string &filedata, const std::string &cfg, const std::string &filename)
{
    simplecpp::OutputList outputList;
    std::vector<std::string> files;

    std::istringstream istr(filedata);
    simplecpp::TokenList tokens1(istr, files, Path::simplifyPath(filename), &outputList);
    inlineSuppressions(tokens1);
    tokens1.removeComments();
    removeComments();
    setDirectives(tokens1);

    reportOutput(outputList, true);

    if (hasErrors(outputList))
        return "";

    std::string ret;
    try {
        ret = getcode(tokens1, cfg, files, filedata.find("#file") != std::string::npos);
    } catch (const simplecpp::Output &) {
        ret.clear();
    }
    return ret;
}

void Preprocessor::reportOutput(const simplecpp::OutputList &outputList, bool showerror)
{
    for (const simplecpp::Output &out : outputList) {
        switch (out.type) {
        case simplecpp::Output::ERROR:
            if (out.msg.compare(0,6,"#error")!=0 || showerror)
                error(out.location.file(), out.location.line, out.msg);
            break;
        case simplecpp::Output::WARNING:
        case simplecpp::Output::PORTABILITY_BACKSLASH:
            break;
        case simplecpp::Output::MISSING_HEADER: {
            const std::string::size_type pos1 = out.msg.find_first_of("<\"");
            const std::string::size_type pos2 = out.msg.find_first_of(">\"", pos1 + 1U);
            if (pos1 < pos2 && pos2 != std::string::npos)
                missingInclude(out.location.file(), out.location.line, out.msg.substr(pos1+1, pos2-pos1-1), out.msg[pos1] == '\"' ? UserHeader : SystemHeader);
        }
        break;
        case simplecpp::Output::INCLUDE_NESTED_TOO_DEEPLY:
        case simplecpp::Output::SYNTAX_ERROR:
        case simplecpp::Output::UNHANDLED_CHAR_ERROR:
            error(out.location.file(), out.location.line, out.msg);
            break;
        case simplecpp::Output::EXPLICIT_INCLUDE_NOT_FOUND:
            error(emptyString, 0, out.msg);
            break;
        }
    }
}

void Preprocessor::error(const std::string &filename, unsigned int linenr, const std::string &msg)
{
    std::list<ErrorMessage::FileLocation> locationList;
    if (!filename.empty()) {
        const ErrorMessage::FileLocation loc(filename, linenr, 0);
        locationList.push_back(loc);
    }
    mErrorLogger->reportErr(ErrorMessage(locationList,
                                         mFile0,
                                         Severity::error,
                                         msg,
                                         "preprocessorErrorDirective",
                                         false));
}

// Report that include is missing
void Preprocessor::missingInclude(const std::string &filename, unsigned int linenr, const std::string &header, HeaderTypes headerType)
{
    const std::string fname = Path::fromNativeSeparators(filename);
    Suppressions::ErrorMessage errorMessage;
    errorMessage.errorId = "missingInclude";
    errorMessage.setFileName(fname);
    errorMessage.lineNumber = linenr;
    if (mSettings.nomsg.isSuppressed(errorMessage))
        return;
    errorMessage.errorId = "missingIncludeSystem";
    if (headerType == SystemHeader && mSettings.nomsg.isSuppressed(errorMessage))
        return;

    if (headerType == SystemHeader)
        missingSystemIncludeFlag = true;
    else
        missingIncludeFlag = true;
    if (mErrorLogger && mSettings.checkConfiguration) {

        std::list<ErrorMessage::FileLocation> locationList;
        if (!filename.empty()) {
            ErrorMessage::FileLocation loc;
            loc.line = linenr;
            loc.setfile(Path::toNativeSeparators(filename));
            locationList.push_back(loc);
        }
        ErrorMessage errmsg(locationList, mFile0, Severity::information,
                            (headerType==SystemHeader) ?
                            "Include file: <" + header + "> not found. Please note: Cppcheck does not need standard library headers to get proper results." :
                            "Include file: \"" + header + "\" not found.",
                            (headerType==SystemHeader) ? "missingIncludeSystem" : "missingInclude",
                            false);
        mErrorLogger->reportInfo(errmsg);
    }
}

bool Preprocessor::validateCfg(const std::string &cfg, const std::list<simplecpp::MacroUsage> &macroUsageList)
{
    bool ret = true;
    std::list<std::string> defines;
    splitcfg(cfg, defines, emptyString);
    for (const std::string &define : defines) {
        if (define.find('=') != std::string::npos)
            continue;
        const std::string macroName(define.substr(0, define.find('(')));
        for (const simplecpp::MacroUsage &mu : macroUsageList) {
            if (mu.macroValueKnown)
                continue;
            if (mu.macroName != macroName)
                continue;
            bool directiveLocation = std::any_of(mDirectives.cbegin(), mDirectives.cend(),
            [=](const Directive &dir) {
                return mu.useLocation.file() == dir.file && mu.useLocation.line == dir.linenr;
            });

            if (!directiveLocation) {
                if (mSettings.isEnabled(Settings::INFORMATION))
                    validateCfgError(mu.useLocation.file(), mu.useLocation.line, cfg, macroName);
                ret = false;
            }
        }
    }

    return ret;
}

void Preprocessor::validateCfgError(const std::string &file, const unsigned int line, const std::string &cfg, const std::string &macro)
{
    const std::string id = "ConfigurationNotChecked";
    std::list<ErrorMessage::FileLocation> locationList;
    const ErrorMessage::FileLocation loc(file, line, 0);
    locationList.push_back(loc);
    const ErrorMessage errmsg(locationList, mFile0, Severity::information, "Skipping configuration '" + cfg + "' since the value of '" + macro + "' is unknown. Use -D if you want to check it. You can use -U to skip it explicitly.", id, false);
    mErrorLogger->reportInfo(errmsg);
}

void Preprocessor::getErrorMessages(ErrorLogger *errorLogger, const Settings *settings)
{
    Settings settings2(*settings);
    Preprocessor preprocessor(settings2, errorLogger);
    settings2.checkConfiguration = true;
    preprocessor.missingInclude(emptyString, 1, emptyString, UserHeader);
    preprocessor.missingInclude(emptyString, 1, emptyString, SystemHeader);
    preprocessor.validateCfgError(emptyString, 1, "X", "X");
    preprocessor.error(emptyString, 1, "#error message");   // #error ..
}

void Preprocessor::dump(std::ostream &out) const
{
    // Create a xml directive dump.
    // The idea is not that this will be readable for humans. It's a
    // data dump that 3rd party tools could load and get useful info from.
    out << "  <directivelist>" << std::endl;

    for (const Directive &dir : mDirectives) {
        out << "    <directive "
            << "file=\"" << ErrorLogger::toxml(dir.file) << "\" "
            << "linenr=\"" << dir.linenr << "\" "
            // str might contain characters such as '"', '<' or '>' which
            // could result in invalid XML, so run it through toxml().
            << "str=\"" << ErrorLogger::toxml(dir.str) << "\"/>" << std::endl;
    }
    out << "  </directivelist>" << std::endl;
}

static const std::uint32_t crc32Table[] = {
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
    0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
    0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
    0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
    0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
    0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
    0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
    0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
    0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
    0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
    0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
    0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
    0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
    0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
    0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
    0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
    0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
    0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
    0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
    0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
    0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
    0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
    0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
    0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
    0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
    0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
    0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
    0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
    0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
    0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
    0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};

static std::uint32_t crc32(const std::string &data)
{
    std::uint32_t crc = ~0U;
    for (char c : data) {
        crc = crc32Table[(crc ^ (unsigned char)c) & 0xFF] ^ (crc >> 8);
    }
    return crc ^ ~0U;
}

unsigned int Preprocessor::calculateChecksum(const simplecpp::TokenList &tokens1, const std::string &toolinfo) const
{
    std::ostringstream ostr;
    ostr << toolinfo << '\n';
    for (const simplecpp::Token *tok = tokens1.cfront(); tok; tok = tok->next) {
        if (!tok->comment)
            ostr << tok->str();
    }
    for (std::map<std::string, simplecpp::TokenList *>::const_iterator it = mTokenLists.begin(); it != mTokenLists.end(); ++it) {
        for (const simplecpp::Token *tok = it->second->cfront(); tok; tok = tok->next) {
            if (!tok->comment)
                ostr << tok->str();
        }
    }
    return crc32(ostr.str());
}

void Preprocessor::simplifyPragmaAsm(simplecpp::TokenList *tokenList)
{
    Preprocessor::simplifyPragmaAsmPrivate(tokenList);
    for (std::pair<const std::string, simplecpp::TokenList *>& list : mTokenLists) {
        Preprocessor::simplifyPragmaAsmPrivate(list.second);
    }
}

void Preprocessor::simplifyPragmaAsmPrivate(simplecpp::TokenList *tokenList)
{
    // assembler code..
    for (simplecpp::Token *tok = tokenList->front(); tok; tok = tok->next) {
        if (tok->op != '#')
            continue;
        if (sameline(tok, tok->previousSkipComments()))
            continue;

        const simplecpp::Token * const tok2 = tok->nextSkipComments();
        if (!tok2 || !sameline(tok, tok2) || tok2->str() != "pragma")
            continue;

        const simplecpp::Token * const tok3 = tok2->nextSkipComments();
        if (!tok3 || !sameline(tok, tok3) || tok3->str() != "asm")
            continue;

        const simplecpp::Token *endasm = tok3;
        while ((endasm = endasm->next) != nullptr) {
            if (endasm->op != '#' || sameline(endasm,endasm->previousSkipComments()))
                continue;
            const simplecpp::Token * const endasm2 = endasm->nextSkipComments();
            if (!endasm2 || !sameline(endasm, endasm2) || endasm2->str() != "pragma")
                continue;
            const simplecpp::Token * const endasm3 = endasm2->nextSkipComments();
            if (!endasm3 || !sameline(endasm2, endasm3) || endasm3->str() != "endasm")
                continue;
            while (sameline(endasm,endasm3))
                endasm = endasm->next;
            break;
        }

        const simplecpp::Token * const tok4 = tok3->next;
        tok->setstr("asm");
        const_cast<simplecpp::Token *>(tok2)->setstr("(");
        const_cast<simplecpp::Token *>(tok3)->setstr(")");
        const_cast<simplecpp::Token *>(tok4)->setstr(";");
        while (tok4->next != endasm)
            tokenList->deleteToken(tok4->next);
    }
}