862 lines
24 KiB
C++
862 lines
24 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2016 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 tokenizeH
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#define tokenizeH
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//---------------------------------------------------------------------------
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#include "errorlogger.h"
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#include "tokenlist.h"
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#include "config.h"
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#include <string>
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#include <map>
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#include <set>
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#include <list>
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#include <ctime>
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class Settings;
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class SymbolDatabase;
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class TimerResults;
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/// @addtogroup Core
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/// @{
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/** @brief The main purpose is to tokenize the source code. It also has functions that simplify the token list */
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class CPPCHECKLIB Tokenizer {
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friend class TestSimplifyTokens;
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friend class TestSimplifyTypedef;
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friend class TestTokenizer;
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public:
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Tokenizer();
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Tokenizer(const Settings * settings, ErrorLogger *errorLogger);
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~Tokenizer();
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void setTimerResults(TimerResults *tr) {
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m_timerResults = tr;
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}
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/** Is the code C. Used for bailouts */
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bool isC() const {
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return list.isC();
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}
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/** Is the code CPP. Used for bailouts */
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bool isCPP() const {
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return list.isCPP();
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}
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/**
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* Check if inner scope ends with a call to a noreturn function
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* \param endScopeToken The '}' token
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* \param unknown set to true if it's unknown if the scope is noreturn
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* \return true if scope ends with a function call that might be 'noreturn'
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*/
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bool IsScopeNoReturn(const Token *endScopeToken, bool *unknown = nullptr) const;
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bool createTokens(std::istream &code,
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const std::string& FileName);
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bool simplifyTokens1(const std::string &configuration,
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bool noSymbolDB_AST = false);
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/**
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* Tokenize code
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* @param code input stream for code, e.g.
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* \code
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* #file "p.h"
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* class Foo
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* {
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* private:
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* void Bar();
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* };
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*
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* #endfile
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* void Foo::Bar()
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* {
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* }
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* \endcode
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*
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* @param FileName The filename
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* @param configuration E.g. "A" for code where "#ifdef A" is true
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* @param noSymbolDB_AST Disable creation of SymbolDatabase and AST
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* @return false if source code contains syntax errors
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*/
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bool tokenize(std::istream &code,
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const char FileName[],
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const std::string &configuration = emptyString,
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bool noSymbolDB_AST = false);
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/** Set variable id */
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void setVarId();
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void setVarIdPass1();
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void setVarIdPass2();
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/**
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* Basic simplification of tokenlist
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*
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* @param FileName The filename to run; used to do
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* markup checks.
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*
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* @return false if there is an error that requires aborting
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* the checking of this file.
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*/
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bool simplifyTokenList1(const char FileName[]);
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void SimplifyNamelessRValueReferences();
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/**
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* Most aggressive simplification of tokenlist
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*
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* @return false if there is an error that requires aborting
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* the checking of this file.
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*/
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bool simplifyTokenList2();
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/**
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* Deletes dead code between 'begin' and 'end'.
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* In general not everything can be erased, such as:
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* - code after labels;
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* - code outside the scope where the function is called;
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* - code after a change of scope caused by 'switch(...);'
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* instructions, like 'case %any%;' or 'default;'
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* Also, if the dead code contains a 'switch' block
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* and inside it there's a label, the function removes all
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* the 'switch(..)' tokens and every occurrence of 'case %any%; | default;'
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* expression, such as the 'switch' block is reduced to a simple block.
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*
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* @param begin Tokens after this have a possibility to be erased.
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* @param end Tokens before this have a possibility to be erased.
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*/
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static void eraseDeadCode(Token *begin, const Token *end);
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/**
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* Simplify '* & ( %name% ) =' or any combination of '* &' and '()'
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* parentheses around '%name%' to '%name% ='
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*/
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void simplifyMulAndParens();
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/**
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* Calculates sizeof value for given type.
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* @param type Token which will contain e.g. "int", "*", or string.
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* @return sizeof for given type, or 0 if it can't be calculated.
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*/
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unsigned int sizeOfType(const Token *type) const;
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/**
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* Try to determine if function parameter is passed by value by looking
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* at the function declaration.
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* @param fpar token for function parameter in the function call
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* @return true if the parameter is passed by value. if unsure, false is returned
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*/
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bool isFunctionParameterPassedByValue(const Token *fpar) const;
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/** Simplify assignment in function call "f(x=g());" => "x=g();f(x);"
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*/
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void simplifyAssignmentInFunctionCall();
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/** Simplify assignment where rhs is a block : "x=({123;});" => "{x=123;}" */
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void simplifyAssignmentBlock();
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/**
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* Simplify constant calculations such as "1+2" => "3"
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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();
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/**
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* Simplify dereferencing a pointer offset by a number:
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* "*(ptr + num)" => "ptr[num]"
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* "*(ptr - num)" => "ptr[-num]"
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*/
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void simplifyOffsetPointerDereference();
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/**
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* Simplify referencing a pointer offset:
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* "Replace "&str[num]" => "(str + num)"
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*/
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void simplifyOffsetPointerReference();
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/** Insert array size where it isn't given */
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void arraySize();
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/** Simplify labels and 'case|default' syntaxes.
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*/
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void simplifyLabelsCaseDefault();
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/** simplify case ranges (gcc extension)
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*/
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void simplifyCaseRange();
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/** Remove macros in global scope */
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void removeMacrosInGlobalScope();
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/** Remove undefined macro in class definition:
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* class DLLEXPORT Fred { };
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* class Fred FINAL : Base { };
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*/
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void removeMacroInClassDef();
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/** Remove unknown macro in variable declarations: PROGMEM char x; */
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void removeMacroInVarDecl();
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/** Remove redundant assignment */
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void removeRedundantAssignment();
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/** Simplifies some realloc usage like
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* 'x = realloc (0, n);' => 'x = malloc(n);'
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* 'x = realloc (y, 0);' => 'x = 0; free(y);'
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*/
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void simplifyRealloc();
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/** Add parentheses for sizeof: sizeof x => sizeof(x) */
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void sizeofAddParentheses();
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/**
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* Replace sizeof() to appropriate size.
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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 simplifySizeof();
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/**
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* Simplify variable declarations (split up)
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* \param only_k_r_fpar Only simplify K&R function parameters
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*/
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void simplifyVarDecl(bool only_k_r_fpar);
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void simplifyVarDecl(Token * tokBegin, Token * tokEnd, bool only_k_r_fpar);
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/**
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* Simplify variable initialization
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* '; int *p(0);' => '; int *p = 0;'
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*/
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void simplifyInitVar();
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Token * initVar(Token * tok);
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/**
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* Convert platform dependent types to standard types.
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* 32 bits: size_t -> unsigned long
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* 64 bits: size_t -> unsigned long long
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*/
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void simplifyPlatformTypes();
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/**
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* Collapse compound standard types into a single token.
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* unsigned long long int => long _isUnsigned=true,_isLong=true
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*/
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void simplifyStdType();
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/**
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* Simplify easy constant '?:' operation
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* Example: 0 ? (2/0) : 0 => 0
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* @return true if something is modified
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* false if nothing is done.
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*/
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bool simplifyConstTernaryOp();
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/**
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* Simplify compound assignments
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* Example: ";a+=b;" => ";a=a+b;"
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*/
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void simplifyCompoundAssignment();
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/**
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* Simplify the location of "static" and "const" qualifiers in
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* a variable declaration or definition.
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* Example: "int static const a;" => "static const a;"
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* Example: "long long const static b;" => "static const long long b;"
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*/
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void simplifyStaticConst();
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/**
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* Simplify assignments in "if" and "while" conditions
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* Example: "if(a=b);" => "a=b;if(a);"
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* Example: "while(a=b) { f(a); }" => "a = b; while(a){ f(a); a = b; }"
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* Example: "do { f(a); } while(a=b);" => "do { f(a); a = b; } while(a);"
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*/
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void simplifyIfAndWhileAssign();
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/**
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* Simplify multiple assignments.
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* Example: "a = b = c = 0;" => "a = 0; b = 0; c = 0;"
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*/
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void simplifyVariableMultipleAssign();
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/**
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* Simplify the 'C Alternative Tokens'
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* Examples:
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* "if(s and t)" => "if(s && t)"
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* "while((r bitand s) and not t)" => while((r & s) && !t)"
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* "a and_eq b;" => "a &= b;"
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*/
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bool simplifyCAlternativeTokens();
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/**
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* Simplify comma into a semicolon when possible:
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* - "delete a, delete b" => "delete a; delete b;"
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* - "a = 0, b = 0;" => "a = 0; b = 0;"
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* - "return a(), b;" => "a(); return b;"
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*/
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void simplifyComma();
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/** Add braces to an if-block, for-block, etc.
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* @return true if no syntax errors
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*/
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bool simplifyAddBraces();
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/** Add braces to an if-block, for-block, etc.
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* for command starting at token including else-block
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* @return last token of command
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* or input token in case of an error where no braces are added
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* or NULL when syntaxError is called
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*/
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Token * simplifyAddBracesToCommand(Token * tok);
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/** Add pair of braces to an single if-block, else-block, for-block, etc.
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* for command starting at token
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* @return last token of command
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* or input token in case of an error where no braces are added
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* or NULL when syntaxError is called
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*/
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Token * simplifyAddBracesPair(Token *tok, bool commandWithCondition);
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/**
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* typedef A mytype;
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* mytype c;
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*
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* Becomes:
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* typedef A mytype;
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* A c;
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*/
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void simplifyTypedef();
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/**
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* Simplify casts
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*/
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void simplifyCasts();
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/**
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* Change (multiple) arrays to (multiple) pointers.
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*/
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void simplifyUndefinedSizeArray();
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/**
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* A simplify function that replaces a variable with its value in cases
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* when the value is known. e.g. "x=10; if(x)" => "x=10;if(10)"
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*
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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 simplifyKnownVariables();
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/**
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* Utility function for simplifyKnownVariables. Get data about an
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* assigned variable.
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*/
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static bool simplifyKnownVariablesGetData(unsigned int varid, Token **_tok2, Token **_tok3, std::string &value, unsigned int &valueVarId, bool &valueIsPointer, bool floatvar);
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/**
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* utility function for simplifyKnownVariables. Perform simplification
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* of a given variable
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*/
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bool simplifyKnownVariablesSimplify(Token **tok2, Token *tok3, unsigned int varid, const std::string &structname, std::string &value, unsigned int valueVarId, bool valueIsPointer, const Token * const valueToken, int indentlevel) const;
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/** Simplify useless C++ empty namespaces, like: 'namespace %name% { }'*/
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void simplifyEmptyNamespaces();
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/** Simplify redundant code placed after control flow statements :
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* 'return', 'throw', 'goto', 'break' and 'continue'
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*/
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void simplifyFlowControl();
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/** Expand nested strcat() calls. */
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void simplifyNestedStrcat();
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/** Simplify "if else" */
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void elseif();
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/** Simplify conditions
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* @return true if something is modified
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* false if nothing is done.
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*/
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bool simplifyConditions();
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/** Remove redundant code, e.g. if( false ) { int a; } should be
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* removed, because it is never executed.
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* @return true if something is modified
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* false if nothing is done.
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*/
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bool removeRedundantConditions();
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/**
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* Remove redundant for:
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* "for (x=0;x<1;x++) { }" => "{ x = 1; }"
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*/
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void removeRedundantFor();
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/**
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* Reduces "; ;" to ";", except in "( ; ; )"
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*/
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void removeRedundantSemicolons();
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/** Simplify function calls - constant return value
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* @return true if something is modified
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* false if nothing is done.
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*/
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bool simplifyFunctionReturn();
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/** Struct simplification
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* "struct S { } s;" => "struct S { }; S s;"
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*/
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void simplifyStructDecl();
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/**
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* Remove redundant parentheses:
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* - "((x))" => "(x)"
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* - "(function())" => "function()"
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* - "(delete x)" => "delete x"
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* - "(delete [] x)" => "delete [] x"
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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 simplifyRedundantParentheses();
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void simplifyCharAt();
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/** Simplify references */
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void simplifyReference();
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/**
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* Simplify functions like "void f(x) int x; {"
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* into "void f(int x) {"
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*/
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void simplifyFunctionParameters();
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/**
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* Simplify templates
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*/
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void simplifyTemplates();
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void simplifyDoublePlusAndDoubleMinus();
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void simplifyRedundantConsecutiveBraces();
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void simplifyArrayAccessSyntax();
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void simplifyParameterVoid();
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void fillTypeSizes();
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void combineOperators();
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void combineStrings();
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void concatenateDoubleSharp();
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void simplifyFileAndLineMacro();
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void simplifyNull();
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void concatenateNegativeNumberAndAnyPositive();
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void simplifyExternC();
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void simplifyRoundCurlyParentheses();
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void simplifySQL();
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void checkForEnumsWithTypedef();
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void findComplicatedSyntaxErrorsInTemplates();
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/**
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* Simplify e.g. 'atol("0")' into '0'
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*/
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void simplifyMathFunctions();
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/**
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* Simplify e.g. 'sin(0)' into '0'
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*/
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void simplifyMathExpressions();
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/**
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* Modify strings in the token list by replacing hex and oct
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* values. E.g. "\x61" -> "a" and "\000" -> "\0"
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* @param source The string to be modified, e.g. "\x61"
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* @return Modified string, e.g. "a"
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*/
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static std::string simplifyString(const std::string &source);
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/**
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* is token pointing at function head?
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* @param tok A '(' or ')' token in a possible function head
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* @param endsWith string after function head
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* @return token matching with endsWith if syntax seems to be a function head else nullptr
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*/
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const Token * isFunctionHead(const Token *tok, const std::string &endsWith) const;
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private:
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/**
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* is token pointing at function head?
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* @param tok A '(' or ')' token in a possible function head
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* @param endsWith string after function head
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* @param cpp c++ code
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* @return token matching with endsWith if syntax seems to be a function head else nullptr
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*/
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static const Token * isFunctionHead(const Token *tok, const std::string &endsWith, bool cpp);
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/**
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* simplify "while (0)"
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*/
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void simplifyWhile0();
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/**
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* Simplify while(func() && errno==EINTR)
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*/
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void simplifyErrNoInWhile();
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/**
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* Simplify while(func(f))
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*/
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void simplifyFuncInWhile();
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/**
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* Remove "std::" before some function names
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*/
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void simplifyStd();
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/** Simplify pointer to standard type (C only) */
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void simplifyPointerToStandardType();
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/** Simplify function pointers */
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void simplifyFunctionPointers();
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/**
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* Send error message to error logger about internal bug.
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* @param tok the token that this bug concerns.
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*/
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void cppcheckError(const Token *tok) const;
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/**
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* Setup links for tokens so that one can call Token::link().
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*/
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void createLinks();
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/**
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* Setup links between < and >.
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*/
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void createLinks2();
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public:
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/** Syntax error */
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void syntaxError(const Token *tok) const;
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/** Syntax error. Example: invalid number of ')' */
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void syntaxError(const Token *tok, char c) const;
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private:
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/** Report that there is an unhandled "class x y {" code */
|
|
void unhandled_macro_class_x_y(const Token *tok) const;
|
|
|
|
/**
|
|
* assert that tokens are ok - used during debugging for example
|
|
* to catch problems in simplifyTokenList1/2.
|
|
*/
|
|
void validate() const;
|
|
|
|
/** Validate that expression is valid. If it's invalid a syntax error is reported. */
|
|
void validateExpr(const Token *start, const Token *end);
|
|
|
|
/**
|
|
* Remove __declspec()
|
|
*/
|
|
void simplifyDeclspec();
|
|
|
|
/**
|
|
* Remove calling convention
|
|
*/
|
|
void simplifyCallingConvention();
|
|
|
|
/**
|
|
* Remove __attribute__ ((?))
|
|
*/
|
|
void simplifyAttribute();
|
|
|
|
/**
|
|
* Remove keywords "volatile", "inline", "register", and "restrict"
|
|
*/
|
|
void simplifyKeyword();
|
|
|
|
/**
|
|
* Remove __asm
|
|
*/
|
|
void simplifyAsm();
|
|
|
|
/**
|
|
* asm heuristics, Put ^{} statements in asm()
|
|
*/
|
|
void simplifyAsm2();
|
|
|
|
/**
|
|
* Simplify bitfields - the field width is removed as we don't use it.
|
|
*/
|
|
void simplifyBitfields();
|
|
|
|
/**
|
|
* Remove unnecessary member qualification
|
|
*/
|
|
void removeUnnecessaryQualification();
|
|
|
|
/**
|
|
* Add std:: in front of std classes, when using namespace std; was given
|
|
*/
|
|
void simplifyNamespaceStd();
|
|
|
|
/**
|
|
* Convert Microsoft memory functions
|
|
* CopyMemory(dst, src, len) -> memcpy(dst, src, len)
|
|
* FillMemory(dst, len, val) -> memset(dst, val, len)
|
|
* MoveMemory(dst, src, len) -> memmove(dst, src, len)
|
|
* ZeroMemory(dst, len) -> memset(dst, 0, len)
|
|
*/
|
|
void simplifyMicrosoftMemoryFunctions();
|
|
|
|
/**
|
|
* Convert Microsoft string functions
|
|
* _tcscpy -> strcpy
|
|
*/
|
|
void simplifyMicrosoftStringFunctions();
|
|
|
|
/**
|
|
* Remove Borland code
|
|
*/
|
|
void simplifyBorland();
|
|
|
|
/**
|
|
* Remove Qt signals and slots
|
|
*/
|
|
void simplifyQtSignalsSlots();
|
|
|
|
/**
|
|
* Collapse operator name tokens into single token
|
|
* operator = => operator=
|
|
*/
|
|
void simplifyOperatorName();
|
|
|
|
/**
|
|
* Remove [[deprecated]] (C++14) from TokenList
|
|
*/
|
|
void simplifyDeprecated();
|
|
|
|
/**
|
|
* Replace strlen(str)
|
|
* @return true if any replacement took place, false else
|
|
* */
|
|
bool simplifyStrlen();
|
|
|
|
/**
|
|
* Prepare ternary operators with parentheses so that the AST can be created
|
|
* */
|
|
void prepareTernaryOpForAST();
|
|
|
|
/**
|
|
* check for duplicate enum definition
|
|
*/
|
|
bool duplicateDefinition(Token **tokPtr) const;
|
|
|
|
/**
|
|
* report error message
|
|
*/
|
|
void reportError(const Token* tok, const Severity::SeverityType severity, const std::string& id, const std::string& msg, bool inconclusive = false) const;
|
|
void reportError(const std::list<const Token*>& callstack, Severity::SeverityType severity, const std::string& id, const std::string& msg, bool inconclusive = false) const;
|
|
|
|
bool duplicateTypedef(Token **tokPtr, const Token *name, const Token *typeDef) const;
|
|
|
|
void unsupportedTypedef(const Token *tok) const;
|
|
|
|
void setVarIdClassDeclaration(Token * const startToken,
|
|
const std::map<std::string, unsigned int> &variableId,
|
|
const unsigned int scopeStartVarId,
|
|
std::map<unsigned int, std::map<std::string,unsigned int> >& structMembers);
|
|
|
|
|
|
/**
|
|
* Simplify e.g. 'return(strncat(temp,"a",1));' into
|
|
* strncat(temp,"a",1); return temp;
|
|
*/
|
|
void simplifyReturnStrncat();
|
|
|
|
/**
|
|
* Output list of unknown types.
|
|
*/
|
|
void printUnknownTypes() const;
|
|
|
|
public:
|
|
|
|
/** Was there templates in the code? */
|
|
bool codeWithTemplates() const {
|
|
return _codeWithTemplates;
|
|
}
|
|
|
|
|
|
void setSettings(const Settings *settings) {
|
|
_settings = settings;
|
|
list.setSettings(settings);
|
|
}
|
|
|
|
const SymbolDatabase *getSymbolDatabase() const {
|
|
return _symbolDatabase;
|
|
}
|
|
void createSymbolDatabase();
|
|
void deleteSymbolDatabase();
|
|
|
|
/** print --debug output if debug flags match the simplification:
|
|
* 0=unknown/both simplifications
|
|
* 1=1st simplifications
|
|
* 2=2nd simplifications
|
|
*/
|
|
void printDebugOutput(unsigned int simplification) const;
|
|
|
|
void dump(std::ostream &out) const;
|
|
|
|
Token *deleteInvalidTypedef(Token *typeDef);
|
|
|
|
/**
|
|
* Get variable count.
|
|
* @return number of variables
|
|
*/
|
|
unsigned int varIdCount() const {
|
|
return _varId;
|
|
}
|
|
|
|
/**
|
|
* Token list: stores all tokens.
|
|
*/
|
|
TokenList list;
|
|
// Implement tokens() as a wrapper for convinience when using the TokenList
|
|
const Token* tokens() const {
|
|
return list.front();
|
|
}
|
|
|
|
/**
|
|
* Copy tokens.
|
|
* @param dest destination token where copied tokens will be inserted after
|
|
* @param first first token to copy
|
|
* @param last last token to copy
|
|
* @param one_line true=>copy all tokens to the same line as dest. false=>copy all tokens to dest while keeping the 'line breaks'
|
|
* @return new location of last token copied
|
|
*/
|
|
static Token *copyTokens(Token *dest, const Token *first, const Token *last, bool one_line = true);
|
|
|
|
/**
|
|
* Helper function to check whether number is zero (0 or 0.0 or 0E+0) or not?
|
|
* @param s the string to check
|
|
* @return true in case is is zero and false otherwise.
|
|
*/
|
|
static bool isZeroNumber(const std::string &s);
|
|
|
|
/**
|
|
* Helper function to check whether number is one (1 or 0.1E+1 or 1E+0) or not?
|
|
* @param s the string to check
|
|
* @return true in case is is one and false otherwise.
|
|
*/
|
|
static bool isOneNumber(const std::string &s);
|
|
|
|
/**
|
|
* Helper function to check whether number is two (2 or 0.2E+1 or 2E+0) or not?
|
|
* @param s the string to check
|
|
* @return true in case is is two and false otherwise.
|
|
*/
|
|
static bool isTwoNumber(const std::string &s);
|
|
|
|
/**
|
|
* Helper function to check for start of function execution scope.
|
|
* Do not use this in checks. Use the symbol database.
|
|
* @param tok pointer to end parentheses of parameter list
|
|
* @return pointer to start brace of function scope or nullptr if not start.
|
|
*/
|
|
static const Token * startOfExecutableScope(const Token * tok);
|
|
|
|
bool isMaxTime() const {
|
|
#ifdef MAXTIME
|
|
return (std::time(0) > maxtime);
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
private:
|
|
/** Disable copy constructor, no implementation */
|
|
Tokenizer(const Tokenizer &);
|
|
|
|
/** Disable assignment operator, no implementation */
|
|
Tokenizer &operator=(const Tokenizer &);
|
|
|
|
Token *processFunc(Token *tok2, bool inOperator) const;
|
|
|
|
/** Set pod types */
|
|
void setPodTypes();
|
|
|
|
/** settings */
|
|
const Settings * _settings;
|
|
|
|
/** errorlogger */
|
|
ErrorLogger* const _errorLogger;
|
|
|
|
/** Symbol database that all checks etc can use */
|
|
SymbolDatabase *_symbolDatabase;
|
|
|
|
/** E.g. "A" for code where "#ifdef A" is true. This is used to
|
|
print additional information in error situations. */
|
|
std::string _configuration;
|
|
|
|
/** sizeof information for known types */
|
|
std::map<std::string, unsigned int> _typeSize;
|
|
|
|
/** variable count */
|
|
unsigned int _varId;
|
|
|
|
/**
|
|
* was there any templates? templates that are "unused" are
|
|
* removed from the token list
|
|
*/
|
|
bool _codeWithTemplates;
|
|
|
|
/**
|
|
* TimerResults
|
|
*/
|
|
TimerResults *m_timerResults;
|
|
|
|
#ifdef MAXTIME
|
|
/** Tokenizer maxtime */
|
|
std::time_t maxtime;
|
|
#endif
|
|
};
|
|
|
|
/// @}
|
|
|
|
//---------------------------------------------------------------------------
|
|
#endif // tokenizeH
|