cppcheck/lib/tokenize.h

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/*
* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2018 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 tokenizeH
#define tokenizeH
//---------------------------------------------------------------------------
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#include "config.h"
#include "errorlogger.h"
#include "tokenlist.h"
#include <ctime>
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#include <list>
#include <map>
#include <string>
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#include <stack>
class Settings;
class SymbolDatabase;
class TimerResults;
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class Token;
class TemplateSimplifier;
namespace simplecpp {
class TokenList;
}
/// @addtogroup Core
/// @{
/** @brief The main purpose is to tokenize the source code. It also has functions that simplify the token list */
class CPPCHECKLIB Tokenizer {
friend class TestSimplifyTokens;
friend class TestSimplifyTypedef;
friend class TestSimplifyUsing;
friend class TestTokenizer;
friend class SymbolDatabase;
friend class TestSimplifyTemplate;
friend class TemplateSimplifier;
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/** Class used in Tokenizer::setVarIdPass1 */
class VariableMap {
private:
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std::map<std::string, unsigned int> mVariableId;
std::stack<std::list<std::pair<std::string, unsigned int> > > mScopeInfo;
mutable unsigned int mVarId;
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public:
VariableMap();
void enterScope();
bool leaveScope();
void addVariable(const std::string &varname);
bool hasVariable(const std::string &varname) const;
std::map<std::string, unsigned int>::const_iterator find(const std::string &varname) const {
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return mVariableId.find(varname);
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}
std::map<std::string, unsigned int>::const_iterator end() const {
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return mVariableId.end();
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}
const std::map<std::string, unsigned int> &map() const {
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return mVariableId;
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}
unsigned int *getVarId() const {
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return &mVarId;
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}
};
public:
Tokenizer();
Tokenizer(const Settings * settings, ErrorLogger *errorLogger);
~Tokenizer();
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void setTimerResults(TimerResults *tr) {
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mTimerResults = tr;
}
/** Is the code C. Used for bailouts */
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bool isC() const {
return list.isC();
}
/** Is the code CPP. Used for bailouts */
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bool isCPP() const {
return list.isCPP();
}
/**
* Check if inner scope ends with a call to a noreturn function
* \param endScopeToken The '}' token
* \param unknown set to true if it's unknown if the scope is noreturn
* \return true if scope ends with a function call that might be 'noreturn'
*/
bool IsScopeNoReturn(const Token *endScopeToken, bool *unknown = nullptr) const;
bool createTokens(std::istream &code, const std::string& FileName);
void createTokens(const simplecpp::TokenList *tokenList);
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bool simplifyTokens1(const std::string &configuration);
/**
* Tokenize code
* @param code input stream for code, e.g.
* \code
* #file "p.h"
* class Foo
* {
* private:
* void Bar();
* };
*
* #endfile
* void Foo::Bar()
* {
* }
* \endcode
*
* @param FileName The filename
* @param configuration E.g. "A" for code where "#ifdef A" is true
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* @return false if source code contains syntax errors
*/
bool tokenize(std::istream &code,
const char FileName[],
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const std::string &configuration = emptyString);
/** Set variable id */
void setVarId();
void setVarIdPass1();
void setVarIdPass2();
/**
* Basic simplification of tokenlist
*
* @param FileName The filename to run; used to do
* markup checks.
*
* @return false if there is an error that requires aborting
* the checking of this file.
*/
bool simplifyTokenList1(const char FileName[]);
void SimplifyNamelessRValueReferences();
/**
* Most aggressive simplification of tokenlist
*
* @return false if there is an error that requires aborting
* the checking of this file.
*/
bool simplifyTokenList2();
/**
* Deletes dead code between 'begin' and 'end'.
* In general not everything can be erased, such as:
* - code after labels;
* - code outside the scope where the function is called;
* - code after a change of scope caused by 'switch(...);'
* instructions, like 'case %any%;' or 'default;'
* Also, if the dead code contains a 'switch' block
* and inside it there's a label, the function removes all
* the 'switch(..)' tokens and every occurrence of 'case %any%; | default;'
* expression, such as the 'switch' block is reduced to a simple block.
*
* @param begin Tokens after this have a possibility to be erased.
* @param end Tokens before this have a possibility to be erased.
*/
static void eraseDeadCode(Token *begin, const Token *end);
/**
* Simplify '* & ( %name% ) =' or any combination of '* &' and '()'
* parentheses around '%name%' to '%name% ='
*/
void simplifyMulAndParens();
/**
* Calculates sizeof value for given type.
* @param type Token which will contain e.g. "int", "*", or string.
* @return sizeof for given type, or 0 if it can't be calculated.
*/
unsigned int sizeOfType(const Token *type) const;
/**
* Try to determine if function parameter is passed by value by looking
* at the function declaration.
* @param fpar token for function parameter in the function call
* @return true if the parameter is passed by value. if unsure, false is returned
*/
bool isFunctionParameterPassedByValue(const Token *fpar) const;
/** Simplify assignment in function call "f(x=g());" => "x=g();f(x);"
*/
void simplifyAssignmentInFunctionCall();
/** Simplify assignment where rhs is a block : "x=({123;});" => "{x=123;}" */
void simplifyAssignmentBlock();
/**
* Simplify constant calculations such as "1+2" => "3"
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
bool simplifyCalculations();
/**
* Simplify dereferencing a pointer offset by a number:
* "*(ptr + num)" => "ptr[num]"
* "*(ptr - num)" => "ptr[-num]"
*/
void simplifyOffsetPointerDereference();
/**
* Simplify referencing a pointer offset:
* "Replace "&str[num]" => "(str + num)"
*/
void simplifyOffsetPointerReference();
/** Insert array size where it isn't given */
void arraySize();
/** Simplify labels and 'case|default' syntaxes.
*/
void simplifyLabelsCaseDefault();
/** simplify case ranges (gcc extension)
*/
void simplifyCaseRange();
/** Remove macros in global scope */
void removeMacrosInGlobalScope();
/** Remove undefined macro in class definition:
* class DLLEXPORT Fred { };
* class Fred FINAL : Base { };
*/
void removeMacroInClassDef();
/** Remove unknown macro in variable declarations: PROGMEM char x; */
void removeMacroInVarDecl();
/** Remove redundant assignment */
void removeRedundantAssignment();
/** Simplifies some realloc usage like
* 'x = realloc (0, n);' => 'x = malloc(n);'
* 'x = realloc (y, 0);' => 'x = 0; free(y);'
*/
void simplifyRealloc();
/** Add parentheses for sizeof: sizeof x => sizeof(x) */
void sizeofAddParentheses();
/**
* Replace sizeof() to appropriate size.
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
bool simplifySizeof();
/**
* Simplify variable declarations (split up)
* \param only_k_r_fpar Only simplify K&R function parameters
*/
void simplifyVarDecl(const bool only_k_r_fpar);
void simplifyVarDecl(Token * tokBegin, const Token * const tokEnd, const bool only_k_r_fpar);
/**
* Simplify variable initialization
* '; int *p(0);' => '; int *p = 0;'
*/
void simplifyInitVar();
Token * initVar(Token * tok);
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/**
* Convert platform dependent types to standard types.
* 32 bits: size_t -> unsigned long
* 64 bits: size_t -> unsigned long long
*/
void simplifyPlatformTypes();
/**
* Simplify easy constant '?:' operation
* Example: 0 ? (2/0) : 0 => 0
* @return true if something is modified
* false if nothing is done.
*/
bool simplifyConstTernaryOp();
/**
* Simplify compound assignments
* Example: ";a+=b;" => ";a=a+b;"
*/
void simplifyCompoundAssignment();
/**
* Simplify the location of "static" and "const" qualifiers in
* a variable declaration or definition.
* Example: "int static const a;" => "static const a;"
* Example: "long long const static b;" => "static const long long b;"
*/
void simplifyStaticConst();
/**
* Simplify assignments in "if" and "while" conditions
* Example: "if(a=b);" => "a=b;if(a);"
* Example: "while(a=b) { f(a); }" => "a = b; while(a){ f(a); a = b; }"
* Example: "do { f(a); } while(a=b);" => "do { f(a); a = b; } while(a);"
*/
void simplifyIfAndWhileAssign();
/**
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* Simplify multiple assignments.
* Example: "a = b = c = 0;" => "a = 0; b = 0; c = 0;"
*/
void simplifyVariableMultipleAssign();
/**
* Simplify the 'C Alternative Tokens'
* Examples:
* "if(s and t)" => "if(s && t)"
* "while((r bitand s) and not t)" => while((r & s) && !t)"
* "a and_eq b;" => "a &= b;"
*/
bool simplifyCAlternativeTokens();
/**
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* Simplify comma into a semicolon when possible:
* - "delete a, delete b" => "delete a; delete b;"
* - "a = 0, b = 0;" => "a = 0; b = 0;"
* - "return a(), b;" => "a(); return b;"
*/
void simplifyComma();
/** Add braces to an if-block, for-block, etc.
* @return true if no syntax errors
*/
bool simplifyAddBraces();
/** Add braces to an if-block, for-block, etc.
* for command starting at token including else-block
* @return last token of command
* or input token in case of an error where no braces are added
* or NULL when syntaxError is called
*/
Token * simplifyAddBracesToCommand(Token * tok);
/** Add pair of braces to an single if-block, else-block, for-block, etc.
* for command starting at token
* @return last token of command
* or input token in case of an error where no braces are added
* or NULL when syntaxError is called
*/
Token * simplifyAddBracesPair(Token *tok, bool commandWithCondition);
/**
* typedef A mytype;
* mytype c;
*
* Becomes:
* typedef A mytype;
* A c;
*/
void simplifyTypedef();
/**
* Simplify casts
*/
void simplifyCasts();
/**
* Change (multiple) arrays to (multiple) pointers.
*/
void simplifyUndefinedSizeArray();
/**
* A simplify function that replaces a variable with its value in cases
* when the value is known. e.g. "x=10; if(x)" => "x=10;if(10)"
*
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
bool simplifyKnownVariables();
/**
* Utility function for simplifyKnownVariables. Get data about an
* assigned variable.
*/
static bool simplifyKnownVariablesGetData(unsigned int varid, Token **_tok2, Token **_tok3, std::string &value, unsigned int &valueVarId, bool &valueIsPointer, bool floatvar);
/**
* utility function for simplifyKnownVariables. Perform simplification
* of a given variable
*/
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;
/** Simplify useless C++ empty namespaces, like: 'namespace %name% { }'*/
void simplifyEmptyNamespaces();
/** Simplify redundant code placed after control flow statements :
* 'return', 'throw', 'goto', 'break' and 'continue'
*/
void simplifyFlowControl();
/** Expand nested strcat() calls. */
void simplifyNestedStrcat();
/** Simplify "if else" */
void elseif();
/** Simplify conditions
* @return true if something is modified
* false if nothing is done.
*/
bool simplifyConditions();
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/** Remove redundant code, e.g. if( false ) { int a; } should be
* removed, because it is never executed.
* @return true if something is modified
* false if nothing is done.
*/
bool removeRedundantConditions();
/**
* Remove redundant for:
* "for (x=0;x<1;x++) { }" => "{ x = 1; }"
*/
void removeRedundantFor();
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/**
* Reduces "; ;" to ";", except in "( ; ; )"
*/
void removeRedundantSemicolons();
/** Simplify function calls - constant return value
* @return true if something is modified
* false if nothing is done.
*/
bool simplifyFunctionReturn();
/** Struct simplification
* "struct S { } s;" => "struct S { }; S s;"
*/
void simplifyStructDecl();
/**
* Remove redundant parentheses:
* - "((x))" => "(x)"
* - "(function())" => "function()"
* - "(delete x)" => "delete x"
* - "(delete [] x)" => "delete [] x"
* @return true if modifications to token-list are done.
* false if no modifications are done.
*/
bool simplifyRedundantParentheses();
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void simplifyCharAt();
/** Simplify references */
void simplifyReference();
/**
* Simplify functions like "void f(x) int x; {"
* into "void f(int x) {"
*/
void simplifyFunctionParameters();
/**
* Simplify templates
*/
void simplifyTemplates();
void simplifyDoublePlusAndDoubleMinus();
void simplifyRedundantConsecutiveBraces();
void simplifyArrayAccessSyntax();
void simplifyParameterVoid();
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void fillTypeSizes();
void combineOperators();
void combineStringAndCharLiterals();
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void concatenateNegativeNumberAndAnyPositive();
void simplifyExternC();
void simplifyRoundCurlyParentheses();
void simplifySQL();
void checkForEnumsWithTypedef();
void findComplicatedSyntaxErrorsInTemplates();
/**
* Simplify e.g. 'atol("0")' into '0'
*/
void simplifyMathFunctions();
/**
* Simplify e.g. 'sin(0)' into '0'
*/
void simplifyMathExpressions();
/**
* Modify strings in the token list by replacing hex and oct
* values. E.g. "\x61" -> "a" and "\000" -> "\0"
* @param source The string to be modified, e.g. "\x61"
* @return Modified string, e.g. "a"
*/
static std::string simplifyString(const std::string &source);
/**
* is token pointing at function head?
* @param tok A '(' or ')' token in a possible function head
* @param endsWith string after function head
* @return token matching with endsWith if syntax seems to be a function head else nullptr
*/
const Token * isFunctionHead(const Token *tok, const std::string &endsWith) const;
/**
* is token pointing at function head?
* @param tok A '(' or ')' token in a possible function head
* @param endsWith string after function head
* @param cpp c++ code
* @return token matching with endsWith if syntax seems to be a function head else nullptr
*/
static const Token * isFunctionHead(const Token *tok, const std::string &endsWith, bool cpp);
private:
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/**
* simplify "while (0)"
*/
void simplifyWhile0();
/**
* Simplify while(func() && errno==EINTR)
*/
void simplifyErrNoInWhile();
/**
* Simplify while(func(f))
*/
void simplifyFuncInWhile();
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/**
* Remove "std::" before some function names
*/
void simplifyStd();
/** Simplify pointer to standard type (C only) */
void simplifyPointerToStandardType();
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/** Simplify function pointers */
void simplifyFunctionPointers();
/**
* Send error message to error logger about internal bug.
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* @param tok the token that this bug concerns.
*/
void cppcheckError(const Token *tok) const;
/**
* Setup links for tokens so that one can call Token::link().
*/
void createLinks();
/**
* Setup links between < and >.
*/
void createLinks2();
public:
/** Syntax error */
void syntaxError(const Token *tok) const;
/** Syntax error. Unmatched character. */
void unmatchedToken(const Token *tok) const;
/** Syntax error. C++ code in C file. */
void syntaxErrorC(const Token *tok, const std::string &what) const;
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/** Warn about unknown macro(s), configuration is recommended */
void unknownMacroError(const Token *tok1) const;
private:
/** Report that there is an unhandled "class x y {" code */
void unhandled_macro_class_x_y(const Token *tok) const;
/** Check configuration (unknown macros etc) */
void checkConfiguration() const;
void macroWithSemicolonError(const Token *tok, const std::string &macroName) const;
/**
* Is there C++ code in C file?
*/
void validateC() const;
/**
* assert that tokens are ok - used during debugging for example
* to catch problems in simplifyTokenList1/2.
*/
void validate() const;
/** Detect garbage code and call syntaxError() if found. */
void findGarbageCode() const;
/** Detect garbage expression */
static bool isGarbageExpr(const Token *start, const Token *end);
/**
* Remove __declspec()
*/
void simplifyDeclspec();
/**
* Remove calling convention
*/
void simplifyCallingConvention();
/**
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* Remove \__attribute\__ ((?))
*/
void simplifyAttribute();
/**
* Remove keywords "volatile", "inline", "register", and "restrict"
*/
void simplifyKeyword();
/**
* Remove __asm
*/
void simplifyAsm();
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/**
* asm heuristics, Put ^{} statements in asm()
*/
void simplifyAsm2();
/**
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* Simplify \@&hellip; (compiler extension)
*/
void simplifyAt();
/**
* 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();
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/**
* Remove [[attribute]] (C++11 and later) from TokenList
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*/
void simplifyCPPAttribute();
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/**
* Replace strlen(str)
* @return true if any replacement took place, false else
* */
bool simplifyStrlen();
/**
* Convert namespace aliases
*/
void simplifyNamespaceAliases();
/**
* Convert C++17 style nested namespace to older style
*/
void simplifyNestedNamespace();
/**
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* Prepare ternary operators with parentheses so that the AST can be created
* */
void prepareTernaryOpForAST();
/**
* check for duplicate enum definition
*/
static bool duplicateDefinition(Token **tokPtr);
/**
* 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;
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void unsupportedTypedef(const Token *tok) const;
void setVarIdClassDeclaration(const Token * const startToken,
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const VariableMap &variableMap,
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;
/** Find end of SQL (or PL/SQL) block */
static const Token *findSQLBlockEnd(const Token *tokSQLStart);
public:
/** Was there templates in the code? */
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bool codeWithTemplates() const {
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return mCodeWithTemplates;
}
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void setSettings(const Settings *settings) {
mSettings = settings;
list.setSettings(settings);
}
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const SymbolDatabase *getSymbolDatabase() const {
return mSymbolDatabase;
}
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;
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void dump(std::ostream &out) const;
Token *deleteInvalidTypedef(Token *typeDef);
/**
* Get variable count.
* @return number of variables
*/
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unsigned int varIdCount() const {
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return mVarId;
}
/**
* Token list: stores all tokens.
*/
TokenList list;
// Implement tokens() as a wrapper for convenience when using the TokenList
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const Token* tokens() const {
return list.front();
}
/**
* 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);
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#ifdef MAXTIME
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bool isMaxTime() const {
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return (std::time(0) > mMaxTime);
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#else
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static bool isMaxTime() {
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return false;
#endif
}
private:
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/** Disable copy constructor */
Tokenizer(const Tokenizer &) = delete;
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/** Disable assignment operator */
Tokenizer &operator=(const Tokenizer &) = delete;
Token *processFunc(Token *tok2, bool inOperator) const;
/**
* Get new variable id.
* @return new variable id
*/
unsigned int newVarId() {
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return ++mVarId;
}
/** Set pod types */
void setPodTypes();
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/** settings */
const Settings * mSettings;
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/** errorlogger */
ErrorLogger* const mErrorLogger;
/** Symbol database that all checks etc can use */
SymbolDatabase *mSymbolDatabase;
TemplateSimplifier *mTemplateSimplifier;
/** E.g. "A" for code where "#ifdef A" is true. This is used to
print additional information in error situations. */
std::string mConfiguration;
/** sizeof information for known types */
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std::map<std::string, unsigned int> mTypeSize;
/** variable count */
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unsigned int mVarId;
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/** unnamed count "Unnamed0", "Unnamed1", "Unnamed2", ... */
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unsigned int mUnnamedCount;
/**
* was there any templates? templates that are "unused" are
* removed from the token list
*/
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bool mCodeWithTemplates;
/**
* TimerResults
*/
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TimerResults *mTimerResults;
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#ifdef MAXTIME
/** Tokenizer maxtime */
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const std::time_t mMaxTime;
#endif
};
/// @}
//---------------------------------------------------------------------------
#endif // tokenizeH