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templatesimplifier.cpp
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2012 Daniel Marjamäki and 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 "templatesimplifier.h"
#include "mathlib.h"
#include "token.h"
#include "tokenlist.h"
#include "errorlogger.h"
#include "settings.h"
#include <algorithm>
#include <sstream>
#include <list>
#include <set>
#include <stack>
#include <vector>
#include <string>
#include <cassert>
//---------------------------------------------------------------------------
void TemplateSimplifier::cleanupAfterSimplify(Token *tokens)
{
bool goback = false;
for (Token *tok = tokens; tok; tok = tok->next()) {
if (goback) {
tok = tok->previous();
goback = false;
}
if (tok->str() == "(")
tok = tok->link();
else if (Token::Match(tok, "%type% <") &&
(!tok->previous() || tok->previous()->str() == ";")) {
const Token *tok2 = tok->tokAt(2);
std::string type;
while (Token::Match(tok2, "%type% ,") || Token::Match(tok2, "%num% ,")) {
type += tok2->str() + ",";
tok2 = tok2->tokAt(2);
}
if (Token::Match(tok2, "%type% > (") || Token::Match(tok2, "%num% > (")) {
type += tok2->str();
tok->str(tok->str() + "<" + type + ">");
Token::eraseTokens(tok, tok2->tokAt(2));
if (tok == tokens)
goback = true;
}
}
}
}
const Token* TemplateSimplifier::hasComplicatedSyntaxErrorsInTemplates(Token *tokens)
{
// check for more complicated syntax errors when using templates..
for (const Token *tok = tokens; tok; tok = tok->next()) {
// skip executing scopes..
if (Token::simpleMatch(tok, ") {") || Token::Match(tok, ") %var% {") || Token::Match(tok, "[,=] {")) {
while (tok->str() != "{")
tok = tok->next();
tok = tok->link();
}
// skip executing scopes (ticket #1984)..
else if (Token::simpleMatch(tok, "; {"))
tok = tok->next()->link();
// skip executing scopes (ticket #3183)..
else if (Token::simpleMatch(tok, "( {"))
tok = tok->next()->link();
// skip executing scopes (ticket #1985)..
else if (Token::simpleMatch(tok, "try {")) {
tok = tok->next()->link();
while (Token::simpleMatch(tok, "} catch (")) {
tok = tok->linkAt(2);
if (Token::simpleMatch(tok, ") {"))
tok = tok->next()->link();
}
}
// not start of statement?
if (tok->previous() && !Token::Match(tok, "[;{}]"))
continue;
// skip starting tokens.. ;;; typedef typename foo::bar::..
while (Token::Match(tok, "[;{}]"))
tok = tok->next();
while (Token::Match(tok, "typedef|typename"))
tok = tok->next();
while (Token::Match(tok, "%type% ::"))
tok = tok->tokAt(2);
if (!tok)
break;
// template variable or type..
if (Token::Match(tok, "%type% <")) {
// these are used types..
std::set<std::string> usedtypes;
// parse this statement and see if the '<' and '>' are matching
unsigned int level = 0;
for (const Token *tok2 = tok; tok2 && !Token::Match(tok2, "[;{}]"); tok2 = tok2->next()) {
if (tok2->str() == "(")
tok2 = tok2->link();
else if (tok2->str() == "<") {
bool inclevel = false;
if (Token::simpleMatch(tok2->previous(), "operator <"))
;
else if (level == 0)
inclevel = true;
else if (tok2->next() && tok2->next()->isStandardType())
inclevel = true;
else if (Token::simpleMatch(tok2, "< typename"))
inclevel = true;
else if (Token::Match(tok2->tokAt(-2), "<|, %type% <") && usedtypes.find(tok2->previous()->str()) != usedtypes.end())
inclevel = true;
else if (Token::Match(tok2, "< %type%") && usedtypes.find(tok2->next()->str()) != usedtypes.end())
inclevel = true;
else if (Token::Match(tok2, "< %type%")) {
// is the next token a type and not a variable/constant?
// assume it's a type if there comes another "<"
const Token *tok3 = tok2->next();
while (Token::Match(tok3, "%type% ::"))
tok3 = tok3->tokAt(2);
if (Token::Match(tok3, "%type% <"))
inclevel = true;
}
if (inclevel) {
++level;
if (Token::Match(tok2->tokAt(-2), "<|, %type% <"))
usedtypes.insert(tok2->previous()->str());
}
} else if (tok2->str() == ">") {
if (level > 0)
--level;
} else if (tok2->str() == ">>") {
if (level > 0)
--level;
if (level > 0)
--level;
}
}
if (level > 0) {
// syntaxError(tok);
return tok;
}
}
}
return 0;
}
unsigned int TemplateSimplifier::templateParameters(const Token *tok)
{
unsigned int numberOfParameters = 1;
if (!tok)
return 0;
if (tok->str() != "<")
return 0;
tok = tok->next();
unsigned int level = 0;
while (tok) {
// skip const
if (Token::Match(tok, "const %any%"))
tok = tok->next();
// skip struct/union
if (Token::Match(tok, "struct|union %any%"))
tok = tok->next();
// skip std::
if (tok->str() == "::")
tok = tok->next();
while (Token::Match(tok, "%var% ::"))
tok = tok->tokAt(2);
if (!tok)
return 0;
// num/type ..
if (!tok->isNumber() && !tok->isName())
return 0;
tok = tok->next();
if (!tok)
return 0;
// * / const
while (Token::Match(tok, "*|&|const"))
tok = tok->next();
// Function pointer or prototype..
while (tok->str() == "(")
tok = tok->link()->next();
// inner template
if (tok->str() == "<") {
++level;
tok = tok->next();
}
// ,/>
while (tok->str() == ">" || tok->str() == ">>") {
if (level == 0)
return numberOfParameters;
--level;
if (tok->str() == ">>") {
if (level == 0)
return numberOfParameters;
--level;
}
tok = tok->next();
if (!tok)
return 0;
}
if (tok->str() != ",")
continue;
if (level == 0)
++numberOfParameters;
tok = tok->next();
}
return 0;
}
bool TemplateSimplifier::removeTemplate(Token *tok)
{
if (!Token::simpleMatch(tok, "template <"))
return false;
int indentlevel = 0;
unsigned int countgt = 0; // Counter for ">"
for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next()) {
if (tok2->str() == "(") {
tok2 = tok2->link();
} else if (tok2->str() == ")") { // garbage code! (#3504)
Token::eraseTokens(tok,tok2);
tok->deleteThis();
return false;
}
else if (tok2->str() == "{") {
tok2 = tok2->link()->next();
Token::eraseTokens(tok, tok2);
if (tok2 && tok2->str() == ";" && tok2->next())
tok->deleteNext();
tok->deleteThis();
return true;
} else if (tok2->str() == "}") { // garbage code! (#3449)
Token::eraseTokens(tok,tok2);
tok->deleteThis();
return false;
}
// Count ">"
if (tok2->str() == ">")
countgt++;
// don't remove constructor
if (tok2->str() == "explicit" ||
(countgt == 1 && Token::Match(tok2->previous(), "> %type% (") && Token::simpleMatch(tok2->next()->link(), ") {"))) {
Token::eraseTokens(tok, tok2);
tok->deleteThis();
return true;
}
if (tok2->str() == ";") {
tok2 = tok2->next();
Token::eraseTokens(tok, tok2);
tok->deleteThis();
return true;
}
if (tok2->str() == "<")
++indentlevel;
else if (indentlevel >= 2 && tok2->str() == ">")
--indentlevel;
else if (Token::Match(tok2, "> class|struct %var% [,)]")) {
tok2 = tok2->next();
Token::eraseTokens(tok, tok2);
tok->deleteThis();
return true;
}
}
return false;
}
std::set<std::string> TemplateSimplifier::simplifyTemplatesExpandSpecialized(Token *tokens)
{
std::set<std::string> expandedtemplates;
// Locate specialized templates..
for (Token *tok = tokens; tok; tok = tok->next()) {
if (tok->str() != "template")
continue;
if (!Token::simpleMatch(tok->next(), "< >"))
continue;
// what kind of template is this?
Token *tok2 = tok->tokAt(3);
while (tok2 && (tok2->isName() || tok2->str() == "*"))
tok2 = tok2->next();
if (!TemplateSimplifier::templateParameters(tok2))
continue;
// unknown template.. bail out
if (!tok2->previous()->isName())
continue;
tok2 = tok2->previous();
std::string s;
{
std::ostringstream ostr;
const Token *tok3 = tok2;
for (tok3 = tok2; tok3 && tok3->str() != ">"; tok3 = tok3->next()) {
if (tok3 != tok2)
ostr << " ";
ostr << tok3->str();
}
if (!Token::simpleMatch(tok3, "> ("))
continue;
s = ostr.str();
}
// save search pattern..
const std::string pattern(s + " > (");
// remove spaces to create new name
s.erase(std::remove(s.begin(), s.end(), ' '), s.end());
const std::string name(s + ">");
expandedtemplates.insert(name);
// Rename template..
Token::eraseTokens(tok2, Token::findsimplematch(tok2, "("));
tok2->str(name);
// delete the "template < >"
tok->deleteNext(2);
tok->deleteThis();
// Use this special template in the code..
while (NULL != (tok2 = const_cast<Token *>(Token::findmatch(tok2, pattern.c_str())))) {
Token::eraseTokens(tok2, Token::findsimplematch(tok2, "("));
tok2->str(name);
}
}
return expandedtemplates;
}
std::list<Token *> TemplateSimplifier::simplifyTemplatesGetTemplateDeclarations(Token *tokens, bool &codeWithTemplates)
{
std::list<Token *> templates;
for (Token *tok = tokens; tok; tok = tok->next()) {
// TODO: handle namespaces. Right now we don't instantiate templates that are defined in namespaces.
if (Token::Match(tok, "namespace %type% {"))
tok = tok->linkAt(2);
if (Token::simpleMatch(tok, "template <")) {
codeWithTemplates = true;
for (const Token *tok2 = tok; tok2; tok2 = tok2->next()) {
// Just a declaration => ignore this
if (tok2->str() == ";")
break;
// Implementation => add to "templates"
if (tok2->str() == "{") {
templates.push_back(tok);
break;
}
}
}
}
return templates;
}
std::list<Token *> TemplateSimplifier::simplifyTemplatesGetTemplateInstantiations(Token *tokens)
{
std::list<Token *> used;
for (Token *tok = tokens; tok; tok = tok->next()) {
// template definition.. skip it
if (Token::simpleMatch(tok, "template <")) {
tok->next()->findClosingBracket(tok);
if (!tok)
break;
} else if (Token::Match(tok->previous(), "[({};=] %var% <") ||
Token::Match(tok->tokAt(-2), "[,:] private|protected|public %var% <")) {
// Add inner template instantiations first => go to the ">"
// and then parse backwards, adding all seen instantiations
const Token *tok2;
tok->next()->findClosingBracket(tok2);
// parse backwards and add template instantiations
for (; tok2 && tok2 != tok; tok2 = tok2->previous()) {
if (Token::Match(tok2, ", %var% <") &&
TemplateSimplifier::templateParameters(tok2->tokAt(2))) {
used.push_back(tok2->next());
}
}
// Add outer template..
if (TemplateSimplifier::templateParameters(tok->next()))
used.push_back(tok);
}
}
return used;
}
void TemplateSimplifier::simplifyTemplatesUseDefaultArgumentValues(const std::list<Token *> &templates,
const std::list<Token *> &templateInstantiations)
{
for (std::list<Token *>::const_iterator iter1 = templates.begin(); iter1 != templates.end(); ++iter1) {
// template parameters with default value has syntax such as:
// x = y
// this list will contain all the '=' tokens for such arguments
std::list<Token *> eq;
// parameter number. 1,2,3,..
std::size_t templatepar = 1;
// the template classname. This will be empty for template functions
std::string classname;
// Scan template declaration..
for (Token *tok = *iter1; tok; tok = tok->next()) {
// end of template parameters?
if (tok->str() == ">") {
if (Token::Match(tok, "> class|struct %var%"))
classname = tok->strAt(2);
break;
}
// next template parameter
if (tok->str() == ",")
++templatepar;
// default parameter value
else if (tok->str() == "=")
eq.push_back(tok);
}
if (eq.empty() || classname.empty())
continue;
// iterate through all template instantiations
for (std::list<Token *>::const_iterator iter2 = templateInstantiations.begin(); iter2 != templateInstantiations.end(); ++iter2) {
Token *tok = *iter2;
if (!Token::Match(tok, (classname + " < %any%").c_str()))
continue;
// count the parameters..
unsigned int usedpar = 1;
for (tok = tok->tokAt(3); tok; tok = tok->tokAt(2)) {
if (tok->str() == ">")
break;
if (tok->str() == ",")
++usedpar;
else
break;
}
if (tok && tok->str() == ">") {
tok = tok->previous();
std::list<Token *>::const_iterator it = eq.begin();
for (std::size_t i = (templatepar - eq.size()); it != eq.end() && i < usedpar; ++i)
++it;
while (it != eq.end()) {
tok->insertToken(",");
tok = tok->next();
const Token *from = (*it)->next();
std::stack<Token *> links;
while (from && (!links.empty() || (from->str() != "," && from->str() != ">"))) {
tok->insertToken(from->str());
tok = tok->next();
if (Token::Match(tok, "(|["))
links.push(tok);
else if (!links.empty() && Token::Match(tok, ")|]")) {
Token::createMutualLinks(links.top(), tok);
links.pop();
}
from = from->next();
}
++it;
}
}
}
for (std::list<Token *>::iterator it = eq.begin(); it != eq.end(); ++it) {
Token * const eqtok = *it;
const Token *tok2;
for (tok2 = eqtok->next(); tok2; tok2 = tok2->next()) {
if (tok2->str() == "(")
tok2 = tok2->link();
else if (tok2->str() == "," || tok2->str() == ">")
break;
}
Token::eraseTokens(eqtok, tok2);
eqtok->deleteThis();
}
}
}
bool TemplateSimplifier::simplifyTemplatesInstantiateMatch(const Token *instance, const std::string &name, std::size_t numberOfArguments, const char patternAfter[])
{
if (!Token::simpleMatch(instance, (name + " <").c_str()))
return false;
if (numberOfArguments != TemplateSimplifier::templateParameters(instance->next()))
return false;
if (patternAfter) {
const Token *tok = Token::findsimplematch(instance, ">");
if (!tok || !Token::Match(tok->next(), patternAfter))
return false;
}
// nothing mismatching was found..
return true;
}
int TemplateSimplifier::simplifyTemplatesGetTemplateNamePosition(const Token *tok)
{
// get the position of the template name
int namepos = 0;
if (Token::Match(tok, "> class|struct %type% {|:"))
namepos = 2;
else if (Token::Match(tok, "> %type% *|&| %type% ("))
namepos = 2;
else if (Token::Match(tok, "> %type% %type% *|&| %type% ("))
namepos = 3;
else {
// Name not found
return -1;
}
if ((tok->strAt(namepos) == "*" || tok->strAt(namepos) == "&"))
++namepos;
return namepos;
}
void TemplateSimplifier::simplifyTemplatesExpandTemplate(
TokenList& tokenlist,
const Token *tok,
const std::string &name,
std::vector<const Token *> &typeParametersInDeclaration,
const std::string &newName,
std::vector<const Token *> &typesUsedInTemplateInstantion,
std::list<Token *> &templateInstantiations)
{
for (const Token *tok3 = tokenlist.front(); tok3; tok3 = tok3->next()) {
if (tok3->str() == "{" || tok3->str() == "(")
tok3 = tok3->link();
// Start of template..
if (tok3 == tok) {
tok3 = tok3->next();
}
// member function implemented outside class definition
else if (TemplateSimplifier::simplifyTemplatesInstantiateMatch(tok3, name, typeParametersInDeclaration.size(), ":: ~| %var% (")) {
tokenlist.addtoken(newName.c_str(), tok3->linenr(), tok3->fileIndex());
while (tok3->str() != "::")
tok3 = tok3->next();
}
// not part of template.. go on to next token
else
continue;
int indentlevel = 0;
std::stack<Token *> braces; // holds "{" tokens
std::stack<Token *> brackets; // holds "(" tokens
std::stack<Token *> brackets2; // holds "[" tokens
for (; tok3; tok3 = tok3->next()) {
if (tok3->str() == "{")
++indentlevel;
else if (tok3->str() == "}") {
if (indentlevel <= 1 && brackets.empty() && brackets2.empty()) {
// there is a bug if indentlevel is 0
// the "}" token should only be added if indentlevel is 1 but I add it always intentionally
// if indentlevel ever becomes 0, cppcheck will write:
// ### Error: Invalid number of character {
tokenlist.addtoken("}", tok3->linenr(), tok3->fileIndex());
Token::createMutualLinks(braces.top(), tokenlist.back());
braces.pop();
break;
}
--indentlevel;
}
if (tok3->isName()) {
// search for this token in the type vector
unsigned int itype = 0;
while (itype < typeParametersInDeclaration.size() && typeParametersInDeclaration[itype]->str() != tok3->str())
++itype;
// replace type with given type..
if (itype < typeParametersInDeclaration.size()) {
for (const Token *typetok = typesUsedInTemplateInstantion[itype];
typetok && !Token::Match(typetok, "[,>]");
typetok = typetok->next()) {
tokenlist.addtoken(typetok, tok3->linenr(), tok3->fileIndex());
}
continue;
}
}
// replace name..
if (Token::Match(tok3, (name + " !!<").c_str())) {
tokenlist.addtoken(newName.c_str(), tok3->linenr(), tok3->fileIndex());
continue;
}
// copy
tokenlist.addtoken(tok3, tok3->linenr(), tok3->fileIndex());
if (Token::Match(tok3, "%type% <")) {
//if (!Token::simpleMatch(tok3, (name + " <").c_str()))
//done = false;
templateInstantiations.push_back(tokenlist.back());
}
// link() newly tokens manually
if (tok3->str() == "{") {
braces.push(tokenlist.back());
} else if (tok3->str() == "}") {
assert(braces.empty() == false);
Token::createMutualLinks(braces.top(), tokenlist.back());
braces.pop();
} else if (tok3->str() == "(") {
brackets.push(tokenlist.back());
} else if (tok3->str() == "[") {
brackets2.push(tokenlist.back());
} else if (tok3->str() == ")") {
assert(brackets.empty() == false);
Token::createMutualLinks(brackets.top(), tokenlist.back());
brackets.pop();
} else if (tok3->str() == "]") {
assert(brackets2.empty() == false);
Token::createMutualLinks(brackets2.top(), tokenlist.back());
brackets2.pop();
}
}
assert(braces.empty());
assert(brackets.empty());
}
}
static bool isLowerThanOr(const Token* lower)
{
return lower->isAssignmentOp() || Token::Match(lower, ";|(|[|]|)|,|?|:|%oror%|&&|return|throw|case");
}
static bool isLowerThanXor(const Token* lower)
{
return isLowerThanOr(lower) || lower->str() == "|";
}
static bool isLowerThanAnd(const Token* lower)
{
return isLowerThanXor(lower) || lower->str() == "^";
}
static bool isLowerThanShift(const Token* lower)
{
return isLowerThanAnd(lower) || Token::Match(lower, "&|<|<=|>|>=|==|!=");
}
static bool isLowerThanPlusMinus(const Token* lower)
{
return isLowerThanShift(lower) || lower->str() == "<<" || lower->str() == ">>";
}
static bool isLowerThanMulDiv(const Token* lower)
{
return isLowerThanPlusMinus(lower) || lower->str() == "+" || lower->str() == "-";
}
static bool isLowerEqualThanMulDiv(const Token* lower)
{
return isLowerThanMulDiv(lower) || Token::Match(lower, "[*/%]");
}
bool TemplateSimplifier::simplifyNumericCalculations(Token *tok)
{
bool ret = false;
// (1-2)
while (tok->tokAt(4) && tok->next()->isNumber() && tok->tokAt(3)->isNumber()) { // %any% %num% %any% %num% %any%
const Token* op = tok->tokAt(2);
const Token* after = tok->tokAt(4);
if (Token::Match(tok, "* %num% /") && tok->next()->str() == MathLib::multiply(tok->strAt(3), MathLib::divide(tok->next()->str(), tok->strAt(3)))) {
// Division where result is a whole number
} else if (!((op->str() == "*" && (isLowerThanMulDiv(tok) || tok->str() == "*") && isLowerEqualThanMulDiv(after)) || // associative
(Token::Match(op, "[/%]") && isLowerThanMulDiv(tok) && isLowerEqualThanMulDiv(after)) || // NOT associative
(Token::Match(op, "[+-]") && isLowerThanMulDiv(tok) && isLowerThanMulDiv(after)) || // Only partially (+) associative, but handled later
(Token::Match(op, ">>|<<") && isLowerThanShift(tok) && isLowerThanPlusMinus(after)) || // NOT associative
(op->str() == "&" && isLowerThanShift(tok) && isLowerThanShift(after)) || // associative
(op->str() == "^" && isLowerThanAnd(tok) && isLowerThanAnd(after)) || // associative
(op->str() == "|" && isLowerThanXor(tok) && isLowerThanXor(after)))) // associative
break;
tok = tok->next();
// Don't simplify "%num% / 0"
if (Token::Match(op, "[/%] 0"))
continue;
// Integer operations
if (Token::Match(op, ">>|<<|&|^|%or%")) {
const char cop = op->str()[0];
const MathLib::bigint leftInt(MathLib::toLongNumber(tok->str()));
const MathLib::bigint rightInt(MathLib::toLongNumber(tok->strAt(2)));
std::string result;
if (cop == '&' || cop == '|' || cop == '^')
result = MathLib::calculate(tok->str(), tok->strAt(2), cop);
else if (cop == '<') {
if (tok->previous()->str() != "<<" && rightInt > 0) // Ensure that its not a shift operator as used for streams
result = MathLib::toString<MathLib::bigint>(leftInt << rightInt);
} else if (rightInt > 0)
result = MathLib::toString<MathLib::bigint>(leftInt >> rightInt);
if (!result.empty()) {
ret = true;
tok->str(result);
tok->deleteNext(2);
continue;
}
}
else if (Token::Match(tok->previous(), "- %num% - %num%"))
tok->str(MathLib::add(tok->str(), tok->strAt(2)));
else if (Token::Match(tok->previous(), "- %num% + %num%"))
tok->str(MathLib::subtract(tok->str(), tok->strAt(2)));
else {
try {
tok->str(MathLib::calculate(tok->str(), tok->strAt(2), op->str()[0]));
} catch (InternalError &e) {
e.token = tok;
throw;
}
}
tok->deleteNext(2);
ret = true;
}
return ret;
}
// TODO: This is not the correct class for simplifyCalculations(), so it
// should be moved away.
bool TemplateSimplifier::simplifyCalculations(Token *_tokens)
{
bool ret = false;
for (Token *tok = _tokens; tok; tok = tok->next()) {
// Remove parentheses around variable..
// keep parentheses here: dynamic_cast<Fred *>(p);
// keep parentheses here: A operator * (int);
// keep parentheses here: int ( * ( * f ) ( ... ) ) (int) ;
// keep parentheses here: int ( * * ( * compilerHookVector ) (void) ) ( ) ;
// keep parentheses here: operator new [] (size_t);
// keep parentheses here: Functor()(a ... )
// keep parentheses here: ) ( var ) ;
if (Token::Match(tok->next(), "( %var% ) ;|)|,|]|%op%") &&
!tok->isName() &&
tok->str() != ">" &&
tok->str() != "]" &&
!Token::simpleMatch(tok->previous(), "operator") &&
!Token::simpleMatch(tok->previous(), "* )") &&
!Token::simpleMatch(tok->previous(), ") )") &&
!Token::Match(tok->tokAt(-2), "* %var% )") &&
!Token::Match(tok->tokAt(-2), "%type% ( ) ( %var%") &&
!Token::Match(tok, ") ( %var% ) ;")
) {
tok->deleteNext();
tok = tok->next();
tok->deleteNext();
ret = true;
}
if (tok->type() == Token::eChar &&
Token::Match(tok->previous(), "(|&&|%oror% %any% ==|!=|<=|<|>=|> %num% &&|%oror%|)")) {
tok->str(MathLib::toString(tok->str()[1] & 0xff));
}
if (tok->isNumber()) {
// Remove redundant conditions (0&&x) (1||x)
if (Token::Match(tok->previous(), "[(=,] 0 &&") ||
Token::Match(tok->previous(), "[(=,] 1 ||")) {
unsigned int par = 0;
const Token *tok2 = tok;
for (tok2 = tok; tok2; tok2 = tok2->next()) {
if (tok2->str() == "(")
++par;
else if (tok2->str() == ")") {
if (par == 0)
break;
--par;
} else if (par == 0 && (Token::Match(tok2, "[,;]")))
break;
}
if (Token::Match(tok2, "[);,]"))
Token::eraseTokens(tok, tok2);
continue;
}
if (tok->str() == "0") {
if (Token::Match(tok->previous(), "[+-|] 0")) {
tok = tok->previous();
if (Token::Match(tok->tokAt(-4), "[;{}] %var% = %var% [+-|] 0 ;") &&
tok->strAt(-3) == tok->previous()->str()) {
tok = tok->tokAt(-3);
tok->deleteNext(2);
tok->deleteThis();
}
tok->deleteNext();
tok->deleteThis();
ret = true;
} else if (Token::Match(tok->previous(), "[=([,] 0 [+|]") ||
Token::Match(tok->previous(), "return|case 0 [+|]")) {
tok->deleteNext();
tok->deleteThis();
ret = true;
} else if (Token::Match(tok->previous(), "[=[(,] 0 * %any% ,|]|)|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 0 * %any% ,|:|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 0 && %any% ,|:|;|=|%op%")) {
tok->deleteNext();
if (tok->next()->str() == "(")
Token::eraseTokens(tok, tok->next()->link());
tok->deleteNext();
ret = true;
} else if (Token::Match(tok->previous(), "[=[(,] 0 && *|& %any% ,|]|)|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 0 && *|& %any% ,|:|;|=|%op%")) {
tok->deleteNext();
tok->deleteNext();
if (tok->next()->str() == "(")
Token::eraseTokens(tok, tok->next()->link());
tok->deleteNext();
ret = true;
}
}
if (tok->str() == "1") {
if (Token::Match(tok->previous(), "[=[(,] 1 %oror% %any% ,|]|)|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 1 %oror% %any% ,|:|;|=|%op%")) {
tok->deleteNext();
if (tok->next()->str() == "(")
Token::eraseTokens(tok, tok->next()->link());
tok->deleteNext();
ret = true;
} else if (Token::Match(tok->previous(), "[=[(,] 1 %oror% *|& %any% ,|]|)|;|=|%op%") ||
Token::Match(tok->previous(), "return|case 1 %oror% *|& %any% ,|:|;|=|%op%")) {
tok->deleteNext();
tok->deleteNext();
if (tok->next()->str() == "(")
Token::eraseTokens(tok, tok->next()->link());
tok->deleteNext();
ret = true;
}
}
if (Token::simpleMatch(tok->previous(), "* 1") || Token::simpleMatch(tok, "1 *")) {
if (tok->previous() && tok->previous()->isOp())
tok = tok->previous();
tok->deleteNext();
tok->deleteThis();
ret = true;
}
// Remove parentheses around number..
if (Token::Match(tok->tokAt(-2), "%any% ( %num% )") && !tok->tokAt(-2)->isName() && tok->strAt(-2) != ">") {
tok = tok->previous();
tok->deleteThis();
tok->deleteNext();
ret = true;
}
if (Token::simpleMatch(tok->previous(), "( 0 ||") ||
Token::simpleMatch(tok->previous(), "|| 0 )") ||
Token::simpleMatch(tok->previous(), "( 0 |") ||
Token::simpleMatch(tok->previous(), "| 0 )") ||
Token::simpleMatch(tok->previous(), "( 1 &&") ||
Token::simpleMatch(tok->previous(), "&& 1 )")) {
if (tok->previous()->isOp())
tok = tok->previous();
tok->deleteNext();
tok->deleteThis();
ret = true;
}
if (Token::Match(tok, "%num% ==|!=|<=|>=|<|> %num%") &&
MathLib::isInt(tok->str()) &&
MathLib::isInt(tok->strAt(2))) {
if (Token::Match(tok->previous(), "(|&&|%oror%") && Token::Match(tok->tokAt(3), ")|&&|%oror%")) {
const MathLib::bigint op1(MathLib::toLongNumber(tok->str()));
const std::string &cmp(tok->next()->str());
const MathLib::bigint op2(MathLib::toLongNumber(tok->strAt(2)));
std::string result;
if (cmp == "==")
result = (op1 == op2) ? "1" : "0";
else if (cmp == "!=")
result = (op1 != op2) ? "1" : "0";
else if (cmp == "<=")
result = (op1 <= op2) ? "1" : "0";
else if (cmp == ">=")
result = (op1 >= op2) ? "1" : "0";
else if (cmp == "<")
result = (op1 < op2) ? "1" : "0";
else if (cmp == ">")
result = (op1 > op2) ? "1" : "0";
tok->str(result);
tok->deleteNext(2);
ret = true;
}
}
}
// Division where result is a whole number
else if (Token::Match(tok->previous(), "* %num% /") &&
tok->str() == MathLib::multiply(tok->strAt(2), MathLib::divide(tok->str(), tok->strAt(2)))) {
tok->deleteNext(2);
}
else {
ret |= simplifyNumericCalculations(tok);
}
}
return ret;
}
bool TemplateSimplifier::simplifyTemplateInstantions(
TokenList& tokenlist,
ErrorLogger& errorlogger,
const Settings *_settings,
const Token *tok,
std::list<Token *> &templateInstantiations,
std::set<std::string> &expandedtemplates)
{
// this variable is not used at the moment. The intention was to
// allow continuous instantiations until all templates has been expanded
//bool done = false;
// Contains tokens such as "T"
std::vector<const Token *> typeParametersInDeclaration;
for (tok = tok->tokAt(2); tok && tok->str() != ">"; tok = tok->next()) {
if (Token::Match(tok, "%var% ,|>"))
typeParametersInDeclaration.push_back(tok);
}
// bail out if the end of the file was reached
if (!tok)
return false;
// get the position of the template name
int namepos = TemplateSimplifier::simplifyTemplatesGetTemplateNamePosition(tok);
if (namepos == -1) {
// debug message that we bail out..
if (_settings->debugwarnings) {
std::list<const Token *> callstack(1, tok);
errorlogger.reportErr(ErrorLogger::ErrorMessage(callstack, &tokenlist, Severity::debug, "debug", "simplifyTemplates: bailing out", false));
}
return false;
}
// name of template function/class..
const std::string name(tok->strAt(namepos));
const bool isfunc(tok->strAt(namepos + 1) == "(");