cppcheck/lib/templatesimplifier.h

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/*
* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2023 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/>.
*/
//---------------------------------------------------------------------------
#ifndef templatesimplifierH
#define templatesimplifierH
//---------------------------------------------------------------------------
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#include "config.h"
#include <ctime>
#include <list>
#include <map>
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#include <set>
#include <string>
#include <unordered_map>
#include <vector>
class ErrorLogger;
class Settings;
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class Token;
class Tokenizer;
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class TokenList;
struct newInstantiation;
/// @addtogroup Core
/// @{
/** @brief Simplify templates from the preprocessed and partially simplified code. */
class CPPCHECKLIB TemplateSimplifier {
friend class TestSimplifyTemplate;
public:
explicit TemplateSimplifier(Tokenizer &tokenizer);
std::string dump() const {
return mDump;
}
/**
*/
void checkComplicatedSyntaxErrorsInTemplates();
/**
* is the token pointing at a template parameters block
* < int , 3 > => yes
* \param tok start token that must point at "<"
* \return number of parameters (invalid parameters => 0)
*/
static unsigned int templateParameters(const Token *tok);
/**
* Token and its full scopename
*/
class TokenAndName {
Token *mToken;
std::string mScope;
std::string mName;
std::string mFullName;
const Token *mNameToken;
const Token *mParamEnd;
unsigned int mFlags;
enum {
fIsClass = (1 << 0), // class template
fIsFunction = (1 << 1), // function template
fIsVariable = (1 << 2), // variable template
fIsAlias = (1 << 3), // alias template
fIsSpecialization = (1 << 4), // user specialized template
fIsPartialSpecialization = (1 << 5), // user partial specialized template
fIsForwardDeclaration = (1 << 6), // forward declaration
fIsVariadic = (1 << 7), // variadic template
fIsFriend = (1 << 8), // friend template
fFamilyMask = (fIsClass | fIsFunction | fIsVariable)
};
void isClass(bool state) {
setFlag(fIsClass, state);
}
void isFunction(bool state) {
setFlag(fIsFunction, state);
}
void isVariable(bool state) {
setFlag(fIsVariable, state);
}
void isAlias(bool state) {
setFlag(fIsAlias, state);
}
void isSpecialization(bool state) {
setFlag(fIsSpecialization, state);
}
void isPartialSpecialization(bool state) {
setFlag(fIsPartialSpecialization, state);
}
void isForwardDeclaration(bool state) {
setFlag(fIsForwardDeclaration, state);
}
void isVariadic(bool state) {
setFlag(fIsVariadic, state);
}
void isFriend(bool state) {
setFlag(fIsFriend, state);
}
/**
* Get specified flag state.
* @param flag flag to get state of
* @return true if flag set or false in flag not set
*/
bool getFlag(unsigned int flag) const {
return ((mFlags & flag) != 0);
}
/**
* Set specified flag state.
* @param flag flag to set state
* @param state new state of flag
*/
void setFlag(unsigned int flag, bool state) {
mFlags = state ? mFlags | flag : mFlags & ~flag;
}
public:
/**
* Constructor used for instantiations.
* \param token template instantiation name token "name<...>"
* \param scope full qualification of template(scope)
*/
TokenAndName(Token *token, std::string scope);
/**
* Constructor used for declarations.
* \param token template declaration token "template < ... >"
* \param scope full qualification of template(scope)
* \param nameToken template name token "template < ... > class name"
* \param paramEnd template parameter end token ">"
*/
TokenAndName(Token *token, std::string scope, const Token *nameToken, const Token *paramEnd);
TokenAndName(const TokenAndName& other);
~TokenAndName();
bool operator == (const TokenAndName & rhs) const {
return mToken == rhs.mToken && mScope == rhs.mScope && mName == rhs.mName && mFullName == rhs.mFullName &&
mNameToken == rhs.mNameToken && mParamEnd == rhs.mParamEnd && mFlags == rhs.mFlags;
}
std::string dump(const std::vector<std::string>& fileNames) const;
// TODO: do not return non-const pointer from const object
Token * token() const {
return mToken;
}
void token(Token * token) {
mToken = token;
}
const std::string & scope() const {
return mScope;
}
const std::string & name() const {
return mName;
}
const std::string & fullName() const {
return mFullName;
}
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const Token * nameToken() const {
return mNameToken;
}
const Token * paramEnd() const {
return mParamEnd;
}
void paramEnd(const Token *end) {
mParamEnd = end;
}
bool isClass() const {
return getFlag(fIsClass);
}
bool isFunction() const {
return getFlag(fIsFunction);
}
bool isVariable() const {
return getFlag(fIsVariable);
}
bool isAlias() const {
return getFlag(fIsAlias);
}
bool isSpecialization() const {
return getFlag(fIsSpecialization);
}
bool isPartialSpecialization() const {
return getFlag(fIsPartialSpecialization);
}
bool isForwardDeclaration() const {
return getFlag(fIsForwardDeclaration);
}
bool isVariadic() const {
return getFlag(fIsVariadic);
}
bool isFriend() const {
return getFlag(fIsFriend);
}
/**
* Get alias start token.
* template < ... > using X = foo < ... >;
* ^
* @return alias start token
*/
const Token * aliasStartToken() const;
/**
* Get alias end token.
* template < ... > using X = foo < ... >;
* ^
* @return alias end token
*/
const Token * aliasEndToken() const;
/**
* Is token an alias token?
* template < ... > using X = foo < ... >;
* ^
* @param tok token to check
* @return true if alias token, false if not
*/
bool isAliasToken(const Token *tok) const;
/**
* Is declaration the same family (class, function or variable).
*
* @param decl declaration to compare to
* @return true if same family, false if different family
*/
bool isSameFamily(const TemplateSimplifier::TokenAndName &decl) const {
// Make sure a family flag is set and matches.
// This works because at most only one flag will be set.
return ((mFlags & fFamilyMask) && (decl.mFlags & fFamilyMask));
}
};
/**
* Find last token of a template declaration.
* @param tok start token of declaration "template" or token after "template < ... >"
* @return last token of declaration or nullptr if syntax error
*/
static Token *findTemplateDeclarationEnd(Token *tok);
static const Token *findTemplateDeclarationEnd(const Token *tok);
/**
* Match template declaration/instantiation
* @param instance template instantiation
* @param numberOfArguments number of template arguments
* @param variadic last template argument is variadic
* @param patternAfter pattern that must match the tokens after the ">"
* @return match => true
*/
static bool instantiateMatch(const Token *instance, const std::size_t numberOfArguments, bool variadic, const char patternAfter[]);
/**
* Match template declaration/instantiation
* @param tok The ">" token e.g. before "class"
* @return -1 to bail out or positive integer to identity the position
* of the template name.
*/
int getTemplateNamePosition(const Token *tok);
/**
* Get class template name position
* @param tok The ">" token e.g. before "class"
* @param namepos return offset to name
* @return true if name found, false if not
* */
static bool getTemplateNamePositionTemplateClass(const Token *tok, int &namepos);
/**
* Get function template name position
* @param tok The ">" token
* @param namepos return offset to name
* @return true if name found, false if not
* */
static bool getTemplateNamePositionTemplateFunction(const Token *tok, int &namepos);
/**
* Get variable template name position
* @param tok The ">" token
* @param namepos return offset to name
* @return true if name found, false if not
* */
static bool getTemplateNamePositionTemplateVariable(const Token *tok, int &namepos);
/**
* Simplify templates
* @param maxtime time when the simplification should be stopped
*/
void simplifyTemplates(const std::time_t maxtime);
/**
* Simplify constant calculations such as "1+2" => "3"
* @param tok start token
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
static bool simplifyNumericCalculations(Token *tok, bool isTemplate = true);
/**
* Simplify constant calculations such as "1+2" => "3".
* This also performs simple cleanup of parentheses etc.
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
bool simplifyCalculations(Token* frontToken = nullptr, const Token *backToken = nullptr, bool isTemplate = true);
/** Simplify template instantiation arguments.
* @param start first token of arguments
* @param end token following last argument token
*/
void simplifyTemplateArgs(Token *start, const Token *end, std::vector<newInstantiation>* newInst = nullptr);
private:
/**
* Get template declarations
* @return true if code has templates.
*/
bool getTemplateDeclarations();
/** Add template instantiation.
* @param token first token of instantiation
* @param scope scope of instantiation
*/
void addInstantiation(Token *token, const std::string &scope);
/**
* Get template instantiations
*/
void getTemplateInstantiations();
/**
* Fix forward declared default argument values by copying them
* when they are not present in the declaration.
*/
void fixForwardDeclaredDefaultArgumentValues();
/**
* simplify template instantiations (use default argument values)
*/
void useDefaultArgumentValues();
/**
* simplify template instantiations (use default argument values)
* @param declaration template declaration or forward declaration
*/
void useDefaultArgumentValues(TokenAndName &declaration);
/**
* Try to locate a matching declaration for each user defined
* specialization.
*/
void getSpecializations();
/**
* Try to locate a matching declaration for each user defined
* partial specialization.
*/
void getPartialSpecializations();
/**
* simplify template aliases
*/
void simplifyTemplateAliases();
/**
* Simplify templates : expand all instantiations for a template
* @todo It seems that inner templates should be instantiated recursively
* @param templateDeclaration template declaration
* @param specializations template specializations (list each template name token)
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* @param maxtime time when the simplification will stop
* @param expandedtemplates all templates that has been expanded so far. The full names are stored.
* @return true if the template was instantiated
*/
bool simplifyTemplateInstantiations(
const TokenAndName &templateDeclaration,
const std::list<const Token *> &specializations,
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const std::time_t maxtime,
std::set<std::string> &expandedtemplates);
/**
* Simplify templates : add namespace to template name
* @param templateDeclaration template declaration
* @param tok place to insert namespace
*/
void addNamespace(const TokenAndName &templateDeclaration, const Token *tok);
/**
* Simplify templates : check if namespace already present
* @param templateDeclaration template declaration
* @param tok place to start looking for namespace
* @return true if namespace already present
*/
static bool alreadyHasNamespace(const TokenAndName &templateDeclaration, const Token *tok);
/**
* Expand a template. Create "expanded" class/function at end of tokenlist.
* @param templateDeclaration Template declaration information
* @param templateInstantiation Full name of template
* @param typeParametersInDeclaration The type parameters of the template
* @param newName New name of class/function.
* @param copy copy or expand in place
*/
void expandTemplate(
const TokenAndName &templateDeclaration,
const TokenAndName &templateInstantiation,
const std::vector<const Token *> &typeParametersInDeclaration,
const std::string &newName,
bool copy);
/**
* Replace all matching template usages 'Foo < int >' => 'Foo<int>'
* @param instantiation Template instantiation information.
* @param typeStringsUsedInTemplateInstantiation template parameters. list of token strings.
* @param newName The new type name
*/
void replaceTemplateUsage(const TokenAndName &instantiation,
const std::list<std::string> &typeStringsUsedInTemplateInstantiation,
const std::string &newName);
/**
* @brief TemplateParametersInDeclaration
* @param tok template < typename T, typename S >
* ^ tok
* @param typeParametersInDeclaration template < typename T, typename S >
* ^ [0] ^ [1]
*/
static void getTemplateParametersInDeclaration(
const Token * tok,
std::vector<const Token *> & typeParametersInDeclaration);
/**
* Remove a specific "template < ..." template class/function
*/
static bool removeTemplate(Token *tok, std::map<Token*, Token*>* forwardDecls = nullptr);
/** Syntax error */
NORETURN static void syntaxError(const Token *tok);
static bool matchSpecialization(
const Token *templateDeclarationNameToken,
const Token *templateInstantiationNameToken,
const std::list<const Token *> & specializations);
/*
* Same as Token::eraseTokens() but tries to fix up lists with pointers to the deleted tokens.
* @param begin Tokens after this will be erased.
* @param end Tokens before this will be erased.
*/
static void eraseTokens(Token *begin, const Token *end);
/**
* Delete specified token without invalidating pointer to following token.
* tok will be invalidated.
* @param tok token to delete
*/
static void deleteToken(Token *tok);
/**
* Get the new token name.
* @param tok2 name token
* @param typeStringsUsedInTemplateInstantiation type strings use in template instantiation
* @return new token name
*/
std::string getNewName(
Token *tok2,
std::list<std::string> &typeStringsUsedInTemplateInstantiation);
void printOut(
const TokenAndName &tokenAndName,
const std::string &indent = " ") const;
void printOut(const std::string &text = emptyString) const;
Tokenizer &mTokenizer;
TokenList &mTokenList;
const Settings &mSettings;
ErrorLogger *mErrorLogger;
bool mChanged{};
std::list<TokenAndName> mTemplateDeclarations;
std::list<TokenAndName> mTemplateForwardDeclarations;
std::map<Token *, Token *> mTemplateForwardDeclarationsMap;
std::map<Token *, Token *> mTemplateSpecializationMap;
std::map<Token *, Token *> mTemplatePartialSpecializationMap;
std::list<TokenAndName> mTemplateInstantiations;
std::list<TokenAndName> mInstantiatedTemplates;
std::list<TokenAndName> mMemberFunctionsToDelete;
Several fairly significant optimisations (#1518) * Code changes for Token::mImpl optimisation * Added new TokenImpl optimisation Moving members to the TokenImpl struct reduces the size of the Token class, which is a fairly significant optimisation. In my testing on Windows with 32-bit Release-PCRE, this change reduced the size of the Token class from 108 bits to 52 bits and reduced run-time of my test case by around 20%. * Several optimisations Deleted some code that ran very slowly and did nothing, as there is no need to change a Token's string to null if you are about to delete it. Added a frontToken to simplifyCalculations to reduce the amount of work it has to do on already-simplified calculations. Moved template removal to the end of the list as this reduces redundant iteration and saves time. * Added tok argument to simplifyCalculations This means callers can avoid unnecessary work if they know which tokens have already been simplified. Passing nullptr indicates the original behaviour (starting from the front of the list). * Removed mention of member from another change * Re-added and optimised some code deleted in error Changing mTemplateInstantiations to a vector avoids the high cost of doing repeated linear searches. Changing how the code iterates through the array was necessary because the vector can be resized at several points during the loop, which breaks existing references and iterators. * Changed mTemplateInstantiations to a vector This is an optimisation that makes repeated linear searches of this collection significantly faster. Also added a copy constructor to TokenAndName so code can make copies of these objects to keep a reference if a vector gets resized. * A cleaner optimisation to removing template tokens This reverts the previous change to made mInstantiatedTemplates a vector and the iterator changes to support this, and makes mTypesUsedInTemplateInstantiation so the eraseTokens logic can be unified. * Reverted vector to list Also made mTypesUsedInTemplateInstantiation a vector of TokenAndName objects so it can share the same logic as the other members. * Added member for template simplifier pointer This can be used more efficiently than marking Tokens with a flag and then searching through all templates to find the one that matches. * Turned loop inside out This means we only have to iterate through the std::list once. std::list is very expensive to iterate through. * Latest code from danmar and fixed optimisations In particular I have optimised simplifying template instantiation names as this was incredibly slow because of the number of times it had to iterate through the template instantiation list. Previous optimisations to this weren't very effective and broke some edge cases. * Added changes from danmar Made mExplicitInstantiationsToDelete a vector of TokenAndName to be consistent with the rest of the members, which are cleaned up very efficiently. * Tokens can have many templateSimplifierPointers * templateSimplifierPointers must be kept in sync
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std::vector<TokenAndName> mExplicitInstantiationsToDelete;
std::vector<TokenAndName> mTypesUsedInTemplateInstantiation;
std::unordered_map<const Token*, int> mTemplateNamePos;
std::string mDump;
};
/// @}
//---------------------------------------------------------------------------
#endif // templatesimplifierH