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cppcheck/lib/token.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2016 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 "token.h"
#include "errorlogger.h"
#include "settings.h"
#include "symboldatabase.h"
#include "utils.h"
#include <cassert>
#include <cstdlib>
#include <cstring>
#include <string>
#include <iostream>
#include <cctype>
#include <sstream>
#include <map>
#include <stack>
#include <algorithm>
Token::Token(Token **t) :
tokensBack(t),
_next(0),
_previous(0),
_link(0),
_scope(0),
_function(0), // Initialize whole union
_varId(0),
_fileIndex(0),
_linenr(0),
_progressValue(0),
_tokType(eNone),
_flags(0),
_astOperand1(nullptr),
_astOperand2(nullptr),
_astParent(nullptr),
_originalName(nullptr),
valuetype(nullptr)
{
}
Token::~Token()
{
delete _originalName;
delete valuetype;
}
void Token::update_property_info()
{
if (!_str.empty()) {
if (_str == "true" || _str == "false")
_tokType = eBoolean;
else if (_str[0] == '_' || std::isalpha((unsigned char)_str[0])) { // Name
if (_varId)
_tokType = eVariable;
else if (_tokType != eVariable && _tokType != eFunction && _tokType != eType && _tokType != eKeyword)
_tokType = eName;
} else if (std::isdigit((unsigned char)_str[0]) || (_str.length() > 1 && _str[0] == '-' && std::isdigit((unsigned char)_str[1])))
_tokType = eNumber;
else if (_str.length() > 1 && _str[0] == '"' && _str.back() == '"')
_tokType = eString;
else if (_str.length() > 1 && _str[0] == '\'' && _str.back() == '\'')
_tokType = eChar;
else if (_str == "=" || _str == "<<=" || _str == ">>=" ||
(_str.size() == 2U && _str[1] == '=' && std::strchr("+-*/%&^|", _str[0])))
_tokType = eAssignmentOp;
else if (_str.size() == 1 && _str.find_first_of(",[]()?:") != std::string::npos)
_tokType = eExtendedOp;
else if (_str=="<<" || _str==">>" || (_str.size()==1 && _str.find_first_of("+-*/%") != std::string::npos))
_tokType = eArithmeticalOp;
else if (_str.size() == 1 && _str.find_first_of("&|^~") != std::string::npos)
_tokType = eBitOp;
else if (_str.size() <= 2 &&
(_str == "&&" ||
_str == "||" ||
_str == "!"))
_tokType = eLogicalOp;
else if (_str.size() <= 2 && !_link &&
(_str == "==" ||
_str == "!=" ||
_str == "<" ||
_str == "<=" ||
_str == ">" ||
_str == ">="))
_tokType = eComparisonOp;
else if (_str.size() == 2 &&
(_str == "++" ||
_str == "--"))
_tokType = eIncDecOp;
else if (_str.size() == 1 && (_str.find_first_of("{}") != std::string::npos || (_link && _str.find_first_of("<>") != std::string::npos)))
_tokType = eBracket;
else
_tokType = eOther;
} else {
_tokType = eNone;
}
update_property_isStandardType();
}
namespace {
const std::set<std::string> stdTypes = make_container<std::set<std::string> >() <<
"bool" << "char" << "char16_t" << "char32_t" << "double" << "float" << "int" << "long" << "short" << "size_t" << "void" << "wchar_t";
}
void Token::update_property_isStandardType()
{
isStandardType(false);
if (_str.size() < 3)
return;
if (stdTypes.find(_str)!=stdTypes.end()) {
isStandardType(true);
_tokType = eType;
}
}
bool Token::isUpperCaseName() const
{
if (!isName())
return false;
for (size_t i = 0; i < _str.length(); ++i) {
if (std::islower(_str[i]))
return false;
}
return true;
}
void Token::concatStr(std::string const& b)
{
_str.erase(_str.length() - 1);
_str.append(b.begin() + 1, b.end());
update_property_info();
}
std::string Token::strValue() const
{
assert(_tokType == eString);
std::string ret(_str.substr(1, _str.length() - 2));
std::string::size_type pos = 0U;
while ((pos = ret.find('\\', pos)) != std::string::npos) {
ret.erase(pos,1U);
if (ret[pos] >= 'a') {
if (ret[pos] == 'n')
ret[pos] = '\n';
else if (ret[pos] == 'r')
ret[pos] = '\r';
else if (ret[pos] == 't')
ret[pos] = '\t';
}
if (ret[pos] == '0')
return ret.substr(0,pos);
pos++;
}
return ret;
}
void Token::deleteNext(unsigned long index)
{
while (_next && index) {
Token *n = _next;
_next = n->next();
delete n;
--index;
}
if (_next)
_next->previous(this);
else if (tokensBack)
*tokensBack = this;
}
void Token::swapWithNext()
{
if (_next) {
std::swap(_str, _next->_str);
std::swap(_tokType, _next->_tokType);
std::swap(_flags, _next->_flags);
std::swap(_varId, _next->_varId);
std::swap(_fileIndex, _next->_fileIndex);
std::swap(_link, _next->_link);
std::swap(_scope, _next->_scope);
std::swap(_function, _next->_function);
std::swap(_originalName, _next->_originalName);
std::swap(values, _next->values);
std::swap(_progressValue, _next->_progressValue);
}
}
void Token::deleteThis()
{
if (_next) { // Copy next to this and delete next
_str = _next->_str;
_tokType = _next->_tokType;
_flags = _next->_flags;
_varId = _next->_varId;
_fileIndex = _next->_fileIndex;
_linenr = _next->_linenr;
_link = _next->_link;
_scope = _next->_scope;
_function = _next->_function;
_variable = _next->_variable;
_type = _next->_type;
if (_next->_originalName) {
delete _originalName;
_originalName = _next->_originalName;
_next->_originalName = nullptr;
}
values = _next->values;
if (_link)
_link->link(this);
deleteNext();
} else if (_previous && _previous->_previous) { // Copy previous to this and delete previous
_str = _previous->_str;
_tokType = _previous->_tokType;
_flags = _previous->_flags;
_varId = _previous->_varId;
_fileIndex = _previous->_fileIndex;
_linenr = _previous->_linenr;
_link = _previous->_link;
_scope = _previous->_scope;
_function = _previous->_function;
_variable = _previous->_variable;
_type = _previous->_type;
if (_previous->_originalName) {
delete _originalName;
_originalName = _previous->_originalName;
_previous->_originalName = nullptr;
}
values = _previous->values;
if (_link)
_link->link(this);
Token* toDelete = _previous;
_previous = _previous->_previous;
_previous->_next = this;
delete toDelete;
} else {
// We are the last token in the list, we can't delete
// ourselves, so just make us empty
str("");
}
}
void Token::replace(Token *replaceThis, Token *start, Token *end)
{
// Fix the whole in the old location of start and end
if (start->previous())
start->previous()->next(end->next());
if (end->next())
end->next()->previous(start->previous());
// Move start and end to their new location
if (replaceThis->previous())
replaceThis->previous()->next(start);
if (replaceThis->next())
replaceThis->next()->previous(end);
start->previous(replaceThis->previous());
end->next(replaceThis->next());
if (end->tokensBack && *(end->tokensBack) == end) {
while (end->next())
end = end->next();
*(end->tokensBack) = end;
}
// Update _progressValue, fileIndex and linenr
for (Token *tok = start; tok != end->next(); tok = tok->next())
tok->_progressValue = replaceThis->_progressValue;
// Delete old token, which is replaced
delete replaceThis;
}
const Token *Token::tokAt(int index) const
{
const Token *tok = this;
while (index > 0 && tok) {
tok = tok->next();
--index;
}
while (index < 0 && tok) {
tok = tok->previous();
++index;
}
return tok;
}
const Token *Token::linkAt(int index) const
{
const Token *tok = this->tokAt(index);
if (!tok) {
throw InternalError(this, "Internal error. Token::linkAt called with index outside the tokens range.");
}
return tok->link();
}
const std::string &Token::strAt(int index) const
{
const Token *tok = this->tokAt(index);
return tok ? tok->_str : emptyString;
}
static int multiComparePercent(const Token *tok, const char*& haystack, unsigned int varid)
{
++haystack;
// Compare only the first character of the string for optimization reasons
switch (haystack[0]) {
case '\0':
case ' ':
case '|':
//simple '%' character
haystack += 1;
if (tok->isArithmeticalOp() && tok->str() == "%")
return 1;
break;
case 'v':
if (haystack[3] == '%') { // %var%
haystack += 4;
if (tok->varId() != 0)
return 1;
} else { // %varid%
if (varid == 0) {
throw InternalError(tok, "Internal error. Token::Match called with varid 0. Please report this to Cppcheck developers");
}
haystack += 6;
if (tok->varId() == varid)
return 1;
}
break;
case 't':
// Type (%type%)
{
haystack += 5;
if (tok->isName() && tok->varId() == 0 && !tok->isKeyword())
return 1;
}
break;
case 'a':
// Accept any token (%any%) or assign (%assign%)
{
if (haystack[3] == '%') { // %any%
haystack += 4;
return 1;
} else { // %assign%
haystack += 7;
if (tok->isAssignmentOp())
return 1;
}
}
break;
case 'n':
// Number (%num%) or name (%name%)
{
if (haystack[4] == '%') { // %name%
haystack += 5;
if (tok->isName())
return 1;
} else {
haystack += 4;
if (tok->isNumber())
return 1;
}
}
break;
case 'c': {
haystack += 1;
// Character (%char%)
if (haystack[0] == 'h') {
haystack += 4;
if (tok->tokType() == Token::eChar)
return 1;
}
// Const operator (%cop%)
else if (haystack[1] == 'p') {
haystack += 3;
if (tok->isConstOp())
return 1;
}
// Comparison operator (%comp%)
else {
haystack += 4;
if (tok->isComparisonOp())
return 1;
}
}
break;
case 's':
// String (%str%)
{
haystack += 4;
if (tok->tokType() == Token::eString)
return 1;
}
break;
case 'b':
// Bool (%bool%)
{
haystack += 5;
if (tok->isBoolean())
return 1;
}
break;
case 'o': {
++haystack;
if (haystack[1] == '%') {
// Op (%op%)
if (haystack[0] == 'p') {
haystack += 2;
if (tok->isOp())
return 1;
}
// Or (%or%)
else {
haystack += 2;
if (tok->tokType() == Token::eBitOp && tok->str() == "|")
return 1;
}
}
// Oror (%oror%)
else {
haystack += 4;
if (tok->tokType() == Token::eLogicalOp && tok->str() == "||")
return 1;
}
}
break;
default:
//unknown %cmd%, abort
throw InternalError(tok, "Unexpected command");
}
if (*haystack == '|')
haystack += 1;
else
return -1;
return 0xFFFF;
}
int Token::multiCompare(const Token *tok, const char *haystack, unsigned int varid)
{
const char *needle = tok->str().c_str();
const char *needlePointer = needle;
for (;;) {
if (needlePointer == needle && haystack[0] == '%' && haystack[1] != '|' && haystack[1] != '\0' && haystack[1] != ' ') {
int ret = multiComparePercent(tok, haystack, varid);
if (ret < 2)
return ret;
} else if (*haystack == '|') {
if (*needlePointer == 0) {
// If needle is at the end, we have a match.
return 1;
}
needlePointer = needle;
++haystack;
} else if (*needlePointer == *haystack) {
if (*needlePointer == '\0')
return 1;
++needlePointer;
++haystack;
} else if (*haystack == ' ' || *haystack == '\0') {
if (needlePointer == needle)
return 0;
break;
}
// If haystack and needle don't share the same character,
// find next '|' character.
else {
needlePointer = needle;
do {
++haystack;
} while (*haystack != ' ' && *haystack != '|' && *haystack);
if (*haystack == ' ' || *haystack == '\0') {
return -1;
}
++haystack;
}
}
if (*needlePointer == '\0')
return 1;
return -1;
}
bool Token::simpleMatch(const Token *tok, const char pattern[])
{
if (!tok)
return false; // shortcut
const char *current = pattern;
const char *next = std::strchr(pattern, ' ');
if (!next)
next = pattern + std::strlen(pattern);
while (*current) {
std::size_t length = next - current;
if (!tok || length != tok->_str.length() || std::strncmp(current, tok->_str.c_str(), length))
return false;
current = next;
if (*next) {
next = std::strchr(++current, ' ');
if (!next)
next = current + std::strlen(current);
}
tok = tok->next();
}
return true;
}
bool Token::firstWordEquals(const char *str, const char *word)
{
for (;;) {
if (*str != *word) {
return (*str == ' ' && *word == 0);
} else if (*str == 0)
break;
++str;
++word;
}
return true;
}
const char *Token::chrInFirstWord(const char *str, char c)
{
for (;;) {
if (*str == ' ' || *str == 0)
return 0;
if (*str == c)
return str;
++str;
}
}
bool Token::Match(const Token *tok, const char pattern[], unsigned int varid)
{
const char *p = pattern;
while (*p) {
// Skip spaces in pattern..
while (*p == ' ')
++p;
// No token => Success!
if (*p == '\0')
break;
if (!tok) {
// If we have no tokens, pattern "!!else" should return true
if (p[0] == '!' && p[1] == '!' && p[2] != '\0') {
while (*p && *p != ' ')
++p;
continue;
} else
return false;
}
// [.. => search for a one-character token..
if (p[0] == '[' && chrInFirstWord(p, ']')) {
if (tok->str().length() != 1)
return false;
const char *temp = p+1;
bool chrFound = false;
unsigned int count = 0;
while (*temp && *temp != ' ') {
if (*temp == ']') {
++count;
}
else if (*temp == tok->str()[0]) {
chrFound = true;
break;
}
++temp;
}
if (count > 1 && tok->str()[0] == ']')
chrFound = true;
if (!chrFound)
return false;
p = temp;
while (*p && *p != ' ')
++p;
}
// Parse "not" options. Token can be anything except the given one
else if (p[0] == '!' && p[1] == '!' && p[2] != '\0') {
p += 2;
if (firstWordEquals(p, tok->str().c_str()))
return false;
while (*p && *p != ' ')
++p;
}
// Parse multi options, such as void|int|char (accept token which is one of these 3)
else {
int res = multiCompare(tok, p, varid);
if (res == 0) {
// Empty alternative matches, use the same token on next round
while (*p && *p != ' ')
++p;
continue;
} else if (res == -1) {
// No match
return false;
}
}
while (*p && *p != ' ')
++p;
tok = tok->next();
}
// The end of the pattern has been reached and nothing wrong has been found
return true;
}
std::size_t Token::getStrLength(const Token *tok)
{
assert(tok != nullptr);
assert(tok->_tokType == eString);
std::size_t len = 0;
std::string::const_iterator it = tok->str().begin() + 1U;
const std::string::const_iterator end = tok->str().end() - 1U;
while (it != end) {
if (*it == '\\') {
++it;
// string ends at '\0'
if (*it == '0')
return len;
}
if (*it == '\0')
return len;
++it;
++len;
}
return len;
}
std::size_t Token::getStrSize(const Token *tok)
{
assert(tok != nullptr && tok->tokType() == eString);
const std::string &str = tok->str();
unsigned int sizeofstring = 1U;
for (unsigned int i = 1U; i < str.size() - 1U; i++) {
if (str[i] == '\\')
++i;
++sizeofstring;
}
return sizeofstring;
}
std::string Token::getCharAt(const Token *tok, std::size_t index)
{
assert(tok != nullptr);
std::string::const_iterator it = tok->str().begin() + 1U;
const std::string::const_iterator end = tok->str().end() - 1U;
while (it != end) {
if (index == 0) {
if (*it == '\0')
return "\\0";
std::string ret(1, *it);
if (*it == '\\') {
++it;
ret += *it;
}
return ret;
}
if (*it == '\\')
++it;
++it;
--index;
}
assert(index == 0);
return "\\0";
}
void Token::move(Token *srcStart, Token *srcEnd, Token *newLocation)
{
/**[newLocation] -> b -> c -> [srcStart] -> [srcEnd] -> f */
// Fix the gap, which tokens to be moved will leave
srcStart->previous()->next(srcEnd->next());
srcEnd->next()->previous(srcStart->previous());
// Fix the tokens to be moved
srcEnd->next(newLocation->next());
srcStart->previous(newLocation);
// Fix the tokens at newLocation
newLocation->next()->previous(srcEnd);
newLocation->next(srcStart);
// Update _progressValue
for (Token *tok = srcStart; tok != srcEnd->next(); tok = tok->next())
tok->_progressValue = newLocation->_progressValue;
}
Token* Token::nextArgument() const
{
for (const Token* tok = this; tok; tok = tok->next()) {
if (tok->str() == ",")
return tok->next();
else if (tok->link() && Token::Match(tok, "(|{|[|<"))
tok = tok->link();
else if (Token::Match(tok, ")|;"))
return nullptr;
}
return nullptr;
}
Token* Token::nextArgumentBeforeCreateLinks2() const
{
for (const Token* tok = this; tok; tok = tok->next()) {
if (tok->str() == ",")
return tok->next();
else if (tok->link() && Token::Match(tok, "(|{|["))
tok = tok->link();
else if (tok->str() == "<") {
const Token* temp = tok->findClosingBracket();
if (temp)
tok = temp;
} else if (Token::Match(tok, ")|;"))
return nullptr;
}
return nullptr;
}
Token* Token::nextTemplateArgument() const
{
for (const Token* tok = this; tok; tok = tok->next()) {
if (tok->str() == ",")
return tok->next();
else if (tok->link() && Token::Match(tok, "(|{|[|<"))
tok = tok->link();
else if (Token::Match(tok, ">|;"))
return nullptr;
}
return nullptr;
}
const Token * Token::findClosingBracket() const
{
const Token *closing = nullptr;
if (_str == "<") {
unsigned int depth = 0;
for (closing = this; closing != nullptr; closing = closing->next()) {
if (Token::Match(closing, "{|[|(")) {
closing = closing->link();
if (!closing)
return nullptr; // #6803
} else if (Token::Match(closing, "}|]|)|;"))
break;
else if (closing->str() == "<")
++depth;
else if (closing->str() == ">") {
if (--depth == 0)
break;
} else if (closing->str() == ">>") {
if (--depth == 0)
break;
if (--depth == 0)
break;
}
}
}
return closing;
}
Token * Token::findClosingBracket()
{
// return value of const function
return const_cast<Token*>(const_cast<const Token*>(this)->findClosingBracket());
}
//---------------------------------------------------------------------------
const Token *Token::findsimplematch(const Token *startTok, const char pattern[])
{
for (const Token* tok = startTok; tok; tok = tok->next()) {
if (Token::simpleMatch(tok, pattern))
return tok;
}
return 0;
}
const Token *Token::findsimplematch(const Token *startTok, const char pattern[], const Token *end)
{
for (const Token* tok = startTok; tok && tok != end; tok = tok->next()) {
if (Token::simpleMatch(tok, pattern))
return tok;
}
return nullptr;
}
const Token *Token::findmatch(const Token *startTok, const char pattern[], unsigned int varId)
{
for (const Token* tok = startTok; tok; tok = tok->next()) {
if (Token::Match(tok, pattern, varId))
return tok;
}
return nullptr;
}
const Token *Token::findmatch(const Token *startTok, const char pattern[], const Token *end, unsigned int varId)
{
for (const Token* tok = startTok; tok && tok != end; tok = tok->next()) {
if (Token::Match(tok, pattern, varId))
return tok;
}
return nullptr;
}
void Token::insertToken(const std::string &tokenStr, const std::string &originalNameStr, bool prepend)
{
//TODO: Find a solution for the first token on the list
if (prepend && !this->previous())
return;
Token *newToken;
if (_str.empty())
newToken = this;
else
newToken = new Token(tokensBack);
newToken->str(tokenStr);
if (!originalNameStr.empty())
newToken->originalName(originalNameStr);
newToken->_linenr = _linenr;
newToken->_fileIndex = _fileIndex;
newToken->_progressValue = _progressValue;
if (newToken != this) {
if (prepend) {
/*if (this->previous())*/ {
newToken->previous(this->previous());
newToken->previous()->next(newToken);
} /*else if (tokensFront?) {
*tokensFront? = newToken;
}*/
this->previous(newToken);
newToken->next(this);
} else {
if (this->next()) {
newToken->next(this->next());
newToken->next()->previous(newToken);
} else if (tokensBack) {
*tokensBack = newToken;
}
this->next(newToken);
newToken->previous(this);
}
}
}
void Token::eraseTokens(Token *begin, const Token *end)
{
if (!begin || begin == end)
return;
while (begin->next() && begin->next() != end) {
begin->deleteNext();
}
}
void Token::createMutualLinks(Token *begin, Token *end)
{
assert(begin != nullptr);
assert(end != nullptr);
assert(begin != end);
begin->link(end);
end->link(begin);
}
void Token::printOut(const char *title) const
{
if (title && title[0])
std::cout << "\n### " << title << " ###\n";
std::cout << stringifyList(true, true, true, true, true, 0, 0) << std::endl;
}
void Token::printOut(const char *title, const std::vector<std::string> &fileNames) const
{
if (title && title[0])
std::cout << "\n### " << title << " ###\n";
std::cout << stringifyList(true, true, true, true, true, &fileNames, 0) << std::endl;
}
void Token::stringify(std::ostream& os, bool varid, bool attributes, bool macro) const
{
if (attributes) {
if (isUnsigned())
os << "unsigned ";
else if (isSigned())
os << "signed ";
if (isComplex())
os << "_Complex ";
if (isLong()) {
if (_tokType == eString || _tokType == eChar)
os << "L";
else
os << "long ";
}
}
if (macro && isExpandedMacro())
os << "$";
if (_str[0] != '\"' || _str.find('\0') == std::string::npos)
os << _str;
else {
for (std::size_t i = 0U; i < _str.size(); ++i) {
if (_str[i] == '\0')
os << "\\0";
else
os << _str[i];
}
}
if (varid && _varId != 0)
os << '@' << _varId;
}
std::string Token::stringifyList(bool varid, bool attributes, bool linenumbers, bool linebreaks, bool files, const std::vector<std::string>* fileNames, const Token* end) const
{
if (this == end)
return "";
std::ostringstream ret;
unsigned int lineNumber = _linenr;
unsigned int fileInd = files ? ~0U : _fileIndex;
std::map<int, unsigned int> lineNumbers;
for (const Token *tok = this; tok != end; tok = tok->next()) {
bool fileChange = false;
if (tok->_fileIndex != fileInd) {
if (fileInd != ~0U) {
lineNumbers[fileInd] = tok->_fileIndex;
}
fileInd = tok->_fileIndex;
if (files) {
ret << "\n\n##file ";
if (fileNames && fileNames->size() > tok->_fileIndex)
ret << fileNames->at(tok->_fileIndex);
else
ret << fileInd;
}
lineNumber = lineNumbers[fileInd];
fileChange = true;
}
if (linebreaks && (lineNumber != tok->linenr() || fileChange)) {
if (lineNumber+4 < tok->linenr() && fileInd == tok->_fileIndex) {
ret << '\n' << lineNumber+1 << ":\n|\n";
ret << tok->linenr()-1 << ":\n";
ret << tok->linenr() << ": ";
} else {
while (lineNumber < tok->linenr()) {
++lineNumber;
ret << '\n';
if (linenumbers) {
ret << lineNumber << ':';
if (lineNumber == tok->linenr())
ret << ' ';
}
}
}
lineNumber = tok->linenr();
}
tok->stringify(ret, varid, attributes, attributes); // print token
if (tok->next() != end && (!linebreaks || (tok->next()->linenr() <= tok->linenr() && tok->next()->fileIndex() == tok->fileIndex())))
ret << ' ';
}
if (linebreaks && files)
ret << '\n';
return ret.str();
}
std::string Token::stringifyList(const Token* end, bool attributes) const
{
return stringifyList(false, attributes, false, false, false, 0, end);
}
std::string Token::stringifyList(bool varid) const
{
return stringifyList(varid, false, true, true, true, 0, 0);
}
void Token::astOperand1(Token *tok)
{
const Token* const root = tok;
if (_astOperand1)
_astOperand1->_astParent = nullptr;
// goto parent operator
if (tok) {
while (tok->_astParent) {
if (tok->_astParent == this || tok->_astParent == root) // #6838/#6726 avoid hang on garbage code
throw InternalError(this, "Internal error. Token::astOperand1() cyclic dependency.");
tok = tok->_astParent;
}
tok->_astParent = this;
}
_astOperand1 = tok;
}
void Token::astOperand2(Token *tok)
{
const Token* const root = tok;
if (_astOperand2)
_astOperand2->_astParent = nullptr;
// goto parent operator
if (tok) {
while (tok->_astParent) {
//std::cout << tok << " -> " << tok->_astParent ;
if (tok->_astParent == this || tok->_astParent == root) // #6838/#6726 avoid hang on garbage code
throw InternalError(this, "Internal error. Token::astOperand2() cyclic dependency.");
tok = tok->_astParent;
}
tok->_astParent = this;
}
_astOperand2 = tok;
}
bool Token::isCalculation() const
{
if (!Token::Match(this, "%cop%|++|--"))
return false;
if (Token::Match(this, "*|&")) {
// dereference or address-of?
if (!this->astOperand2())
return false;
if (this->astOperand2()->str() == "[")
return false;
// type specification?
std::stack<const Token *> operands;
operands.push(this);
while (!operands.empty()) {
const Token *op = operands.top();
operands.pop();
if (op->isNumber() || op->varId() > 0)
return true;
if (op->astOperand1())
operands.push(op->astOperand1());
if (op->astOperand2())
operands.push(op->astOperand2());
else if (Token::Match(op, "*|&"))
return false;
}
// type specification => return false
return false;
}
return true;
}
bool Token::isUnaryPreOp() const
{
if (!astOperand1() || astOperand2())
return false;
if (!Token::Match(this, "++|--"))
return true;
const Token *tokbefore = _previous;
const Token *tokafter = _next;
for (int distance = 1; distance < 10 && tokbefore; distance++) {
if (tokbefore == _astOperand1)
return false;
if (tokafter == _astOperand1)
return true;
tokbefore = tokbefore->_previous;
tokafter = tokafter->_previous;
}
return false; // <- guess
}
std::string Token::expressionString() const
{
const Token * const top = this;
const Token *start = top;
while (start->astOperand1() &&
(start->astOperand2() || !start->isUnaryPreOp() || Token::simpleMatch(start, "( )")))
start = start->astOperand1();
const Token *end = top;
while (end->astOperand1() && (end->astOperand2() || end->isUnaryPreOp())) {
if (Token::Match(end,"(|[") &&
!(Token::Match(end, "( %type%") && !end->astOperand2())) {
end = end->link();
break;
}
end = end->astOperand2() ? end->astOperand2() : end->astOperand1();
}
// move start to lpar in such expression: '(*it).x'
int par = 0;
for (const Token *tok = start; tok && tok != end; tok = tok->next()) {
if (tok->str() == "(")
++par;
else if (tok->str() == ")") {
if (par == 0)
start = tok->link();
else
--par;
}
}
// move end to rpar in such expression: '2>(x+1)'
par = 0;
for (const Token *tok = end; tok && tok != start; tok = tok->previous()) {
if (tok->str() == ")")
++par;
else if (tok->str() == "(") {
if (par == 0)
end = tok->link();
else
--par;
}
}
std::string ret;
for (const Token *tok = start; tok && tok != end; tok = tok->next()) {
ret += tok->str();
if (Token::Match(tok, "%name%|%num% %name%|%num%"))
ret += " ";
}
return ret + end->str();
}
static void astStringXml(const Token *tok, std::size_t indent, std::ostream &out)
{
const std::string strindent(indent, ' ');
out << strindent << "<token str=\"" << tok->str() << '\"';
if (tok->varId() > 0U)
out << " varId=\"" << MathLib::toString(tok->varId()) << '\"';
if (tok->variable())
out << " variable=\"" << tok->variable() << '\"';
if (tok->function())
out << " function=\"" << tok->function() << '\"';
if (!tok->values.empty())
out << " values=\"" << &tok->values << '\"';
if (!tok->astOperand1() && !tok->astOperand2()) {
out << "/>" << std::endl;
}
else {
out << '>' << std::endl;
if (tok->astOperand1())
astStringXml(tok->astOperand1(), indent+2U, out);
if (tok->astOperand2())
astStringXml(tok->astOperand2(), indent+2U, out);
out << strindent << "</token>" << std::endl;
}
}
void Token::printAst(bool verbose, bool xml, std::ostream &out) const
{
std::set<const Token *> printed;
for (const Token *tok = this; tok; tok = tok->next()) {
if (!tok->_astParent && tok->_astOperand1) {
if (printed.empty() && !xml)
out << "\n\n##AST" << std::endl;
else if (printed.find(tok) != printed.end())
continue;
printed.insert(tok);
if (xml) {
out << "<ast scope=\"" << tok->scope() << "\" fileIndex=\"" << tok->fileIndex() << "\" linenr=\"" << tok->linenr() << "\">" << std::endl;
astStringXml(tok, 2U, out);
out << "</ast>" << std::endl;
} else if (verbose)
out << tok->astStringVerbose(0,0) << std::endl;
else
out << tok->astString(" ") << std::endl;
if (tok->str() == "(")
tok = tok->link();
}
}
}
static std::string indent(const unsigned int indent1, const unsigned int indent2)
{
std::string ret(indent1,' ');
for (unsigned int i = indent1; i < indent2; i += 2)
ret += "| ";
return ret;
}
std::string Token::astStringVerbose(const unsigned int indent1, const unsigned int indent2) const
{
std::string ret;
if (isExpandedMacro())
ret += '$';
ret += _str;
if (valuetype)
ret += " \'" + valuetype->str() + '\'';
ret += '\n';
if (_astOperand1) {
unsigned int i1 = indent1, i2 = indent2 + 2;
if (indent1==indent2 && !_astOperand2)
i1 += 2;
ret += indent(indent1,indent2) + (_astOperand2 ? "|-" : "`-") + _astOperand1->astStringVerbose(i1,i2);
}
if (_astOperand2) {
unsigned int i1 = indent1, i2 = indent2 + 2;
if (indent1==indent2)
i1 += 2;
ret += indent(indent1,indent2) + "`-" + _astOperand2->astStringVerbose(i1,i2);
}
return ret;
}
void Token::printValueFlow(bool xml, std::ostream &out) const
{
unsigned int line = 0;
if (xml)
out << " <valueflow>" << std::endl;
else
out << "\n\n##Value flow" << std::endl;
for (const Token *tok = this; tok; tok = tok->next()) {
if (tok->values.empty())
continue;
if (xml)
out << " <values id=\"" << &tok->values << "\">" << std::endl;
else if (line != tok->linenr())
out << "Line " << tok->linenr() << std::endl;
line = tok->linenr();
if (!xml) {
out << " " << tok->str() << (tok->values.front().isKnown() ? " always " : " possible ");
if (tok->values.size() > 1U)
out << '{';
}
for (std::list<ValueFlow::Value>::const_iterator it=tok->values.begin(); it!=tok->values.end(); ++it) {
if (xml) {
out << " <value ";
if (it->tokvalue)
out << "tokvalue=\"" << it->tokvalue << '\"';
else
out << "intvalue=\"" << it->intvalue << '\"';
if (it->condition)
out << " condition-line=\"" << it->condition->linenr() << '\"';
if (it->isKnown())
out << " known=\"true\"";
else if (it->isPossible())
out << " possible=\"true\"";
out << "/>" << std::endl;
}
else {
if (it != tok->values.begin())
out << ",";
if (it->tokvalue)
out << it->tokvalue->str();
else
out << it->intvalue;
}
}
if (xml)
out << " </values>" << std::endl;
else if (tok->values.size() > 1U)
out << '}' << std::endl;
else
out << std::endl;
}
if (xml)
out << " </valueflow>" << std::endl;
}
const ValueFlow::Value * Token::getValueLE(const MathLib::bigint val, const Settings *settings) const
{
const ValueFlow::Value *ret = nullptr;
std::list<ValueFlow::Value>::const_iterator it;
for (it = values.begin(); it != values.end(); ++it) {
if (it->intvalue <= val && !it->tokvalue) {
if (!ret || ret->inconclusive || (ret->condition && !it->inconclusive))
ret = &(*it);
if (!ret->inconclusive && !ret->condition)
break;
}
}
if (settings && ret) {
if (ret->inconclusive && !settings->inconclusive)
return nullptr;
if (ret->condition && !settings->isEnabled("warning"))
return nullptr;
}
return ret;
}
const ValueFlow::Value * Token::getValueGE(const MathLib::bigint val, const Settings *settings) const
{
const ValueFlow::Value *ret = nullptr;
std::list<ValueFlow::Value>::const_iterator it;
for (it = values.begin(); it != values.end(); ++it) {
if (it->intvalue >= val && !it->tokvalue) {
if (!ret || ret->inconclusive || (ret->condition && !it->inconclusive))
ret = &(*it);
if (!ret->inconclusive && !ret->condition)
break;
}
}
if (settings && ret) {
if (ret->inconclusive && !settings->inconclusive)
return nullptr;
if (ret->condition && !settings->isEnabled("warning"))
return nullptr;
}
return ret;
}
const Token *Token::getValueTokenMinStrSize() const
{
const Token *ret = nullptr;
std::size_t minsize = ~0U;
std::list<ValueFlow::Value>::const_iterator it;
for (it = values.begin(); it != values.end(); ++it) {
if (it->tokvalue && it->tokvalue->tokType() == Token::eString) {
std::size_t size = getStrSize(it->tokvalue);
if (!ret || size < minsize) {
minsize = size;
ret = it->tokvalue;
}
}
}
return ret;
}
const Token *Token::getValueTokenMaxStrLength() const
{
const Token *ret = nullptr;
std::size_t maxlength = 0U;
std::list<ValueFlow::Value>::const_iterator it;
for (it = values.begin(); it != values.end(); ++it) {
if (it->tokvalue && it->tokvalue->tokType() == Token::eString) {
std::size_t length = getStrLength(it->tokvalue);
if (!ret || length > maxlength) {
maxlength = length;
ret = it->tokvalue;
}
}
}
return ret;
}
static const Scope *getfunctionscope(const Scope *s)
{
while (s && s->type != Scope::eFunction)
s = s->nestedIn;
return s;
}
const Token *Token::getValueTokenDeadPointer() const
{
const Scope * const functionscope = getfunctionscope(this->scope());
std::list<ValueFlow::Value>::const_iterator it;
for (it = values.begin(); it != values.end(); ++it) {
// Is this a pointer alias?
if (!it->tokvalue || it->tokvalue->str() != "&")
continue;
// Get variable
const Token *vartok = it->tokvalue->astOperand1();
if (!vartok || !vartok->isName() || !vartok->variable())
continue;
const Variable * const var = vartok->variable();
if (var->isStatic() || var->isReference())
continue;
if (!var->scope())
return nullptr; // #6804
if (var->scope()->type == Scope::eUnion && var->scope()->nestedIn == this->scope())
continue;
// variable must be in same function (not in subfunction)
if (functionscope != getfunctionscope(var->scope()))
continue;
// Is variable defined in this scope or upper scope?
const Scope *s = this->scope();
while ((s != nullptr) && (s != var->scope()))
s = s->nestedIn;
if (!s)
return it->tokvalue;
}
return nullptr;
}
void Token::assignProgressValues(Token *tok)
{
unsigned int total_count = 0;
for (Token *tok2 = tok; tok2; tok2 = tok2->next())
++total_count;
unsigned int count = 0;
for (Token *tok2 = tok; tok2; tok2 = tok2->next())
tok2->_progressValue = count++ * 100 / total_count;
}
void Token::setValueType(ValueType *vt)
{
if (vt != valuetype) {
delete valuetype;
valuetype = vt;
}
}
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