512 lines
18 KiB
C++
512 lines
18 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2021 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#ifndef templatesimplifierH
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#define templatesimplifierH
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//---------------------------------------------------------------------------
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#include "config.h"
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#include <ctime>
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#include <list>
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#include <map>
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#include <set>
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#include <string>
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#include <unordered_map>
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#include <vector>
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class ErrorLogger;
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class Settings;
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class Token;
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class Tokenizer;
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class TokenList;
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/// @addtogroup Core
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/// @{
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/** @brief Simplify templates from the preprocessed and partially simplified code. */
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class CPPCHECKLIB TemplateSimplifier {
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friend class TestSimplifyTemplate;
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public:
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explicit TemplateSimplifier(Tokenizer *tokenizer);
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~TemplateSimplifier();
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/**
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*/
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void checkComplicatedSyntaxErrorsInTemplates();
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/**
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* is the token pointing at a template parameters block
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* < int , 3 > => yes
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* \param tok start token that must point at "<"
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* \return number of parameters (invalid parameters => 0)
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*/
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static unsigned int templateParameters(const Token *tok);
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/**
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* Token and its full scopename
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*/
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class TokenAndName {
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Token *mToken;
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std::string mScope;
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std::string mName;
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std::string mFullName;
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const Token *mNameToken;
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const Token *mParamEnd;
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unsigned int mFlags;
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enum {
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fIsClass = (1 << 0), // class template
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fIsFunction = (1 << 1), // function template
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fIsVariable = (1 << 2), // variable template
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fIsAlias = (1 << 3), // alias template
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fIsSpecialization = (1 << 4), // user specialized template
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fIsPartialSpecialization = (1 << 5), // user partial specialized template
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fIsForwardDeclaration = (1 << 6), // forward declaration
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fIsVariadic = (1 << 7), // variadic template
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fIsFriend = (1 << 8), // friend template
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fFamilyMask = (fIsClass | fIsFunction | fIsVariable)
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};
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void isClass(bool state) {
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setFlag(fIsClass, state);
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}
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void isFunction(bool state) {
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setFlag(fIsFunction, state);
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}
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void isVariable(bool state) {
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setFlag(fIsVariable, state);
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}
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void isAlias(bool state) {
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setFlag(fIsAlias, state);
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}
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void isSpecialization(bool state) {
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setFlag(fIsSpecialization, state);
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}
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void isPartialSpecialization(bool state) {
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setFlag(fIsPartialSpecialization, state);
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}
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void isForwardDeclaration(bool state) {
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setFlag(fIsForwardDeclaration, state);
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}
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void isVariadic(bool state) {
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setFlag(fIsVariadic, state);
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}
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void isFriend(bool state) {
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setFlag(fIsFriend, state);
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}
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/**
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* Get specified flag state.
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* @param flag flag to get state of
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* @return true if flag set or false in flag not set
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*/
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bool getFlag(unsigned int flag) const {
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return ((mFlags & flag) != 0);
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}
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/**
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* Set specified flag state.
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* @param flag flag to set state
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* @param state new state of flag
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*/
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void setFlag(unsigned int flag, bool state) {
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mFlags = state ? mFlags | flag : mFlags & ~flag;
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}
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public:
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/**
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* Constructor used for instantiations.
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* \param token template instantiation name token "name<...>"
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* \param scope full qualification of template(scope)
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*/
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TokenAndName(Token *token, const std::string &scope);
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/**
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* Constructor used for declarations.
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* \param token template declaration token "template < ... >"
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* \param scope full qualification of template(scope)
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* \param nameToken template name token "template < ... > class name"
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* \param paramEnd template parameter end token ">"
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*/
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TokenAndName(Token *token, const std::string &scope, const Token *nameToken, const Token *paramEnd);
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TokenAndName(const TokenAndName& other);
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~TokenAndName();
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bool operator == (const TokenAndName & rhs) const {
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return mToken == rhs.mToken && mScope == rhs.mScope && mName == rhs.mName && mFullName == rhs.mFullName &&
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mNameToken == rhs.mNameToken && mParamEnd == rhs.mParamEnd && mFlags == rhs.mFlags;
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}
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Token * token() const {
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return mToken;
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}
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void token(Token * token) {
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mToken = token;
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}
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const std::string & scope() const {
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return mScope;
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}
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const std::string & name() const {
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return mName;
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}
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const std::string & fullName() const {
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return mFullName;
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}
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const Token * nameToken() const {
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return mNameToken;
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}
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const Token * paramEnd() const {
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return mParamEnd;
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}
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void paramEnd(const Token *end) {
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mParamEnd = end;
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}
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bool isClass() const {
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return getFlag(fIsClass);
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}
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bool isFunction() const {
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return getFlag(fIsFunction);
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}
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bool isVariable() const {
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return getFlag(fIsVariable);
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}
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bool isAlias() const {
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return getFlag(fIsAlias);
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}
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bool isSpecialization() const {
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return getFlag(fIsSpecialization);
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}
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bool isPartialSpecialization() const {
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return getFlag(fIsPartialSpecialization);
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}
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bool isForwardDeclaration() const {
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return getFlag(fIsForwardDeclaration);
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}
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bool isVariadic() const {
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return getFlag(fIsVariadic);
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}
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bool isFriend() const {
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return getFlag(fIsFriend);
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}
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/**
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* Get alias start token.
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* template < ... > using X = foo < ... >;
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* ^
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* @return alias start token
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*/
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const Token * aliasStartToken() const;
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/**
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* Get alias end token.
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* template < ... > using X = foo < ... >;
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* ^
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* @return alias end token
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*/
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const Token * aliasEndToken() const;
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/**
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* Is token an alias token?
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* template < ... > using X = foo < ... >;
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* ^
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* @param tok token to check
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* @return true if alias token, false if not
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*/
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bool isAliasToken(const Token *tok) const;
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/**
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* Is declaration the same family (class, function or variable).
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*
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* @param decl declaration to compare to
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* @return true if same family, false if different family
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*/
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bool isSameFamily(const TemplateSimplifier::TokenAndName &decl) const {
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// Make sure a family flag is set and matches.
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// This works because at most only one flag will be set.
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return ((mFlags & fFamilyMask) & (decl.mFlags & fFamilyMask)) != 0;
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}
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};
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/**
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* Find last token of a template declaration.
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* @param tok start token of declaration "template" or token after "template < ... >"
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* @return last token of declaration or nullptr if syntax error
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*/
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static Token *findTemplateDeclarationEnd(Token *tok);
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static const Token *findTemplateDeclarationEnd(const Token *tok);
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/**
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* Match template declaration/instantiation
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* @param instance template instantiation
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* @param numberOfArguments number of template arguments
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* @param variadic last template argument is variadic
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* @param patternAfter pattern that must match the tokens after the ">"
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* @return match => true
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*/
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static bool instantiateMatch(const Token *instance, const std::size_t numberOfArguments, bool variadic, const char patternAfter[]);
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/**
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* Match template declaration/instantiation
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* @param tok The ">" token e.g. before "class"
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* @return -1 to bail out or positive integer to identity the position
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* of the template name.
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*/
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int getTemplateNamePosition(const Token *tok);
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/**
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* Get class template name position
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* @param tok The ">" token e.g. before "class"
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* @param namepos return offset to name
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* @return true if name found, false if not
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* */
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static bool getTemplateNamePositionTemplateClass(const Token *tok, int &namepos);
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/**
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* Get function template name position
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* @param tok The ">" token
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* @param namepos return offset to name
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* @return true if name found, false if not
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* */
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static bool getTemplateNamePositionTemplateFunction(const Token *tok, int &namepos);
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/**
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* Get variable template name position
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* @param tok The ">" token
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* @param namepos return offset to name
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* @return true if name found, false if not
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* */
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static bool getTemplateNamePositionTemplateVariable(const Token *tok, int &namepos);
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/**
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* Simplify templates
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* @param maxtime time when the simplification should be stopped
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* @param codeWithTemplates output parameter that is set if code contains templates
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*/
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void simplifyTemplates(
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const std::time_t maxtime,
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bool &codeWithTemplates);
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/**
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* Simplify constant calculations such as "1+2" => "3"
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* @param tok start token
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* @return true if modifications to token-list are done.
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* false if no modifications are done.
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*/
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static bool simplifyNumericCalculations(Token *tok, bool isTemplate = true);
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/**
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* Simplify constant calculations such as "1+2" => "3".
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* This also performs simple cleanup of parentheses etc.
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* @return true if modifications to token-list are done.
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* false if no modifications are done.
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*/
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bool simplifyCalculations(Token* frontToken = nullptr, Token *backToken = nullptr, bool isTemplate = true);
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/** Simplify template instantiation arguments.
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* @param start first token of arguments
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* @param end token following last argument token
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*/
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void simplifyTemplateArgs(Token *start, Token *end);
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private:
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/**
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* Get template declarations
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* @return true if code has templates.
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*/
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bool getTemplateDeclarations();
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/** Add template instantiation.
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* @param token first token of instantiation
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* @param scope scope of instantiation
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*/
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void addInstantiation(Token *token, const std::string &scope);
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/**
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* Get template instantiations
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*/
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void getTemplateInstantiations();
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/**
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* Fix forward declared default argument values by copying them
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* when they are not present in the declaration.
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*/
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void fixForwardDeclaredDefaultArgumentValues();
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/**
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* simplify template instantiations (use default argument values)
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*/
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void useDefaultArgumentValues();
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/**
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* simplify template instantiations (use default argument values)
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* @param declaration template declaration or forward declaration
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*/
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void useDefaultArgumentValues(TokenAndName &declaration);
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/**
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* Try to locate a matching declaration for each user defined
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* specialization.
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*/
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void getSpecializations();
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/**
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* Try to locate a matching declaration for each user defined
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* partial specialization.
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*/
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void getPartialSpecializations();
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/**
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* simplify template aliases
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*/
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void simplifyTemplateAliases();
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/**
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* Simplify templates : expand all instantiations for a template
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* @todo It seems that inner templates should be instantiated recursively
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* @param templateDeclaration template declaration
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* @param specializations template specializations (list each template name token)
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* @param maxtime time when the simplification will stop
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* @param expandedtemplates all templates that has been expanded so far. The full names are stored.
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* @return true if the template was instantiated
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*/
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bool simplifyTemplateInstantiations(
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const TokenAndName &templateDeclaration,
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const std::list<const Token *> &specializations,
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const std::time_t maxtime,
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std::set<std::string> &expandedtemplates);
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/**
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* Simplify templates : add namespace to template name
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* @param templateDeclaration template declaration
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* @param tok place to insert namespace
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*/
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void addNamespace(const TokenAndName &templateDeclaration, const Token *tok);
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/**
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* Simplify templates : check if namespace already present
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* @param templateDeclaration template declaration
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* @param tok place to start looking for namespace
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* @return true if namespace already present
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*/
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static bool alreadyHasNamespace(const TokenAndName &templateDeclaration, const Token *tok);
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/**
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* Expand a template. Create "expanded" class/function at end of tokenlist.
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* @param templateDeclaration Template declaration information
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* @param templateInstantiation Full name of template
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* @param typeParametersInDeclaration The type parameters of the template
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* @param newName New name of class/function.
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* @param copy copy or expand in place
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*/
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void expandTemplate(
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const TokenAndName &templateDeclaration,
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const TokenAndName &templateInstantiation,
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const std::vector<const Token *> &typeParametersInDeclaration,
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const std::string &newName,
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bool copy);
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/**
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* Replace all matching template usages 'Foo < int >' => 'Foo<int>'
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* @param instantiation Template instantiation information.
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* @param typeStringsUsedInTemplateInstantiation template parameters. list of token strings.
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* @param newName The new type name
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*/
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void replaceTemplateUsage(const TokenAndName &instantiation,
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const std::list<std::string> &typeStringsUsedInTemplateInstantiation,
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const std::string &newName);
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/**
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* @brief TemplateParametersInDeclaration
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* @param tok template < typename T, typename S >
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* ^ tok
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* @param typeParametersInDeclaration template < typename T, typename S >
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* ^ [0] ^ [1]
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*/
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static void getTemplateParametersInDeclaration(
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const Token * tok,
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std::vector<const Token *> & typeParametersInDeclaration);
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/**
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* Remove a specific "template < ..." template class/function
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*/
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static bool removeTemplate(Token *tok);
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/** Syntax error */
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static void syntaxError(const Token *tok);
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static bool matchSpecialization(
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const Token *templateDeclarationNameToken,
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const Token *templateInstantiationNameToken,
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const std::list<const Token *> & specializations);
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/*
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* Same as Token::eraseTokens() but tries to fix up lists with pointers to the deleted tokens.
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* @param begin Tokens after this will be erased.
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* @param end Tokens before this will be erased.
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*/
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static void eraseTokens(Token *begin, const Token *end);
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/**
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* Delete specified token without invalidating pointer to following token.
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* tok will be invalidated.
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* @param tok token to delete
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*/
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static void deleteToken(Token *tok);
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/**
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* Get the new token name.
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* @param tok2 name token
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* @param typeStringsUsedInTemplateInstantiation type strings use in template instantiation
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* @return new token name
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*/
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std::string getNewName(
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Token *tok2,
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std::list<std::string> &typeStringsUsedInTemplateInstantiation);
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void printOut(
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const TokenAndName &tokenAndName,
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const std::string &indent = " ") const;
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void printOut(const std::string &text = "") const;
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Tokenizer *mTokenizer;
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TokenList &mTokenList;
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const Settings *mSettings;
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ErrorLogger *mErrorLogger;
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bool mChanged;
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std::list<TokenAndName> mTemplateDeclarations;
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std::list<TokenAndName> mTemplateForwardDeclarations;
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std::map<Token *, Token *> mTemplateForwardDeclarationsMap;
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std::map<Token *, Token *> mTemplateSpecializationMap;
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std::map<Token *, Token *> mTemplatePartialSpecializationMap;
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std::list<TokenAndName> mTemplateInstantiations;
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std::list<TokenAndName> mInstantiatedTemplates;
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std::list<TokenAndName> mMemberFunctionsToDelete;
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std::vector<TokenAndName> mExplicitInstantiationsToDelete;
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std::vector<TokenAndName> mTypesUsedInTemplateInstantiation;
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std::unordered_map<const Token*, int> mTemplateNamePos;
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // templatesimplifierH
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