cppcheck/lib/symboldatabase.h

/*
 * Cppcheck - A tool for static C/C++ code analysis
 * 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 symboldatabaseH
#define symboldatabaseH
//---------------------------------------------------------------------------

#include "config.h"
#include "errortypes.h"
#include "library.h"
#include "mathlib.h"
#include "sourcelocation.h"
#include "token.h"
#include "utils.h"

#include <algorithm>
#include <cctype>
#include <iosfwd>
#include <list>
#include <map>
#include <set>
#include <string>
#include <type_traits>
#include <utility>
#include <vector>

namespace cppcheck {
    class Platform;
}

class ErrorLogger;
class Function;
class Scope;
class Settings;
class SymbolDatabase;
class Tokenizer;
class ValueType;

/**
 * @brief Access control enumerations.
 */
enum class AccessControl { Public, Protected, Private, Global, Namespace, Argument, Local, Throw };

/**
 * @brief Array dimension information.
 */
struct Dimension {
    const Token* tok{};    ///< size token
    MathLib::bigint num{}; ///< (assumed) dimension length when size is a number, 0 if not known
    bool known = true;     ///< Known size
};

/** @brief Information about a class type. */
class CPPCHECKLIB Type {
public:
    const Token* classDef;     ///< Points to "class" token
    const Scope* classScope;
    const Scope* enclosingScope;
    enum class NeedInitialization {
        Unknown, True, False
    } needInitialization = NeedInitialization::Unknown;

    struct BaseInfo {
        std::string name;
        const Type* type{};
        const Token* nameTok{};
        AccessControl access{};  // public/protected/private
        bool isVirtual{};
        // allow ordering within containers
        bool operator<(const BaseInfo& rhs) const {
            return this->type < rhs.type;
        }
    };

    struct FriendInfo {
        const Token* nameStart{};
        const Token* nameEnd{};
        const Type* type{};
    };

    std::vector<BaseInfo> derivedFrom;
    std::vector<FriendInfo> friendList;

    const Token* typeStart{};
    const Token* typeEnd{};
    MathLib::bigint sizeOf{};

    explicit Type(const Token* classDef_ = nullptr, const Scope* classScope_ = nullptr, const Scope* enclosingScope_ = nullptr) :
        classDef(classDef_),
        classScope(classScope_),
        enclosingScope(enclosingScope_) {
        if (classDef_ && classDef_->str() == "enum")
            needInitialization = NeedInitialization::True;
        else if (classDef_ && classDef_->str() == "using") {
            typeStart = classDef->tokAt(3);
            typeEnd = typeStart;
            while (typeEnd->next() && typeEnd->next()->str() != ";") {
                if (Token::simpleMatch(typeEnd, "decltype ("))
                    typeEnd = typeEnd->linkAt(1);
                else
                    typeEnd = typeEnd->next();
            }
        }
    }

    std::string name() const;

    const std::string& type() const {
        return classDef ? classDef->str() : emptyString;
    }

    bool isClassType() const;
    bool isEnumType() const;
    bool isStructType() const;
    bool isUnionType() const;

    bool isTypeAlias() const {
        return classDef && classDef->str() == "using";
    }

    const Token *initBaseInfo(const Token *tok, const Token *tok1);

    const Function* getFunction(const std::string& funcName) const;

    /**
     * Check for circulare dependencies, i.e. loops within the class hierarchy
     * @param ancestors list of ancestors. For internal usage only, clients should not supply this argument.
     * @return true if there is a circular dependency
     */
    bool hasCircularDependencies(std::set<BaseInfo>* ancestors = nullptr) const;

    /**
     * Check for dependency
     * @param ancestor potential ancestor
     * @return true if there is a dependency
     */
    bool findDependency(const Type* ancestor) const;

    bool isDerivedFrom(const std::string & ancestor) const;
};

struct CPPCHECKLIB Enumerator {
    explicit Enumerator(const Scope * scope_) : scope(scope_) {}
    const Scope * scope;
    const Token* name{};
    MathLib::bigint value{};
    const Token* start{};
    const Token* end{};
    bool value_known{};
};

/** @brief Information about a member variable. */
class CPPCHECKLIB Variable {
    /** @brief flags mask used to access specific bit. */
    enum {
        fIsMutable    = (1 << 0),   /** @brief mutable variable */
        fIsStatic     = (1 << 1),   /** @brief static variable */
        fIsConst      = (1 << 2),   /** @brief const variable */
        fIsExtern     = (1 << 3),   /** @brief extern variable */
        fIsClass      = (1 << 4),   /** @brief user defined type */
        fIsArray      = (1 << 5),   /** @brief array variable */
        fIsPointer    = (1 << 6),   /** @brief pointer variable */
        fIsReference  = (1 << 7),   /** @brief reference variable */
        fIsRValueRef  = (1 << 8),   /** @brief rvalue reference variable */
        fHasDefault   = (1 << 9),   /** @brief function argument with default value */
        fIsStlType    = (1 << 10),  /** @brief STL type ('std::') */
        fIsStlString  = (1 << 11),  /** @brief std::string|wstring|basic_string&lt;T&gt;|u16string|u32string */
        fIsFloatType  = (1 << 12),  /** @brief Floating point type */
        fIsVolatile   = (1 << 13),  /** @brief volatile */
        fIsSmartPointer = (1 << 14),/** @brief std::shared_ptr|unique_ptr */
        fIsMaybeUnused = (1 << 15), /** @brief marked [[maybe_unused]] */
        fIsInit       = (1 << 16), /** @brief Is variable initialized in declaration */
    };

    /**
     * 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_;
    }

    /**
     * @brief parse and save array dimension information
     * @param settings Platform settings and library
     * @param isContainer Is the array container-like?
     * @return true if array, false if not
     */
    bool arrayDimensions(const Settings* settings, bool& isContainer);

public:
    Variable(const Token *name_, const Token *start_, const Token *end_,
             nonneg int index_, AccessControl access_, const Type *type_,
             const Scope *scope_, const Settings* settings)
        : mNameToken(name_),
        mTypeStartToken(start_),
        mTypeEndToken(end_),
        mIndex(index_),
        mAccess(access_),
        mFlags(0),
        mType(type_),
        mScope(scope_) {
        evaluate(settings);
    }

    Variable(const Token *name_, const std::string &clangType, const Token *typeStart,
             const Token *typeEnd, nonneg int index_, AccessControl access_,
             const Type *type_, const Scope *scope_);

    Variable(const Variable &var, const Scope *scope);

    Variable(const Variable &var);

    ~Variable();

    Variable &operator=(const Variable &var);

    /**
     * Get name token.
     * @return name token
     */
    const Token *nameToken() const {
        return mNameToken;
    }

    /**
     * Get type start token.
     * The type start token doesn't account 'static' and 'const' qualifiers
     * E.g.:
     *     static const int * const p = ...;
     * type start token ^
     * @return type start token
     */
    const Token *typeStartToken() const {
        return mTypeStartToken;
    }

    /**
     * Get type end token.
     * The type end token doesn't account the forward 'const' qualifier
     * E.g.:
     *     static const int * const p = ...;
     *       type end token ^
     * @return type end token
     */
    const Token *typeEndToken() const {
        return mTypeEndToken;
    }

    /**
     * Get end token of variable declaration
     * E.g.
     * int i[2][3] = ...
     *   end token ^
     * @return variable declaration end token
     */
    const Token *declEndToken() const;

    /**
     * Get name string.
     * @return name string
     */
    const std::string &name() const {
        // name may not exist for function arguments
        if (mNameToken)
            return mNameToken->str();

        return emptyString;
    }

    /**
     * Get declaration ID (varId used for variable in its declaration).
     * @return declaration ID
     */
    nonneg int declarationId() const {
        // name may not exist for function arguments
        if (mNameToken)
            return mNameToken->varId();

        return 0;
    }

    /**
     * Get index of variable in declared order.
     * @return variable index
     */
    nonneg int index() const {
        return mIndex;
    }

    /**
     * Is variable public.
     * @return true if public, false if not
     */
    bool isPublic() const {
        return mAccess == AccessControl::Public;
    }

    /**
     * Is variable protected.
     * @return true if protected, false if not
     */
    bool isProtected() const {
        return mAccess == AccessControl::Protected;
    }

    /**
     * Is variable private.
     * @return true if private, false if not
     */
    bool isPrivate() const {
        return mAccess == AccessControl::Private;
    }

    /**
     * Is variable global.
     * @return true if global, false if not
     */
    bool isGlobal() const {
        return mAccess == AccessControl::Global;
    }

    /**
     * Is variable in a namespace.
     * @return true if in a namespace, false if not
     */
    // cppcheck-suppress unusedFunction
    bool isNamespace() const {
        return mAccess == AccessControl::Namespace;
    }

    /**
     * Is variable a function argument.
     * @return true if a function argument, false if not
     */
    bool isArgument() const {
        return mAccess == AccessControl::Argument;
    }

    /**
     * Is variable local.
     * @return true if local, false if not
     */
    bool isLocal() const {
        return (mAccess == AccessControl::Local) && !isExtern();
    }

    /**
     * Is variable a member of a user-defined type.
     * @return true if member, false if not or unknown
     */
    bool isMember() const;

    /**
     * Is variable mutable.
     * @return true if mutable, false if not
     */
    bool isMutable() const {
        return getFlag(fIsMutable);
    }

    /**
     * Is variable volatile.
     * @return true if volatile, false if not
     */
    bool isVolatile() const {
        return getFlag(fIsVolatile);
    }

    /**
     * Is variable static.
     * @return true if static, false if not
     */
    bool isStatic() const {
        return getFlag(fIsStatic);
    }

    /**
     * Is variable extern.
     * @return true if extern, false if not
     */
    bool isExtern() const {
        return getFlag(fIsExtern);
    }

    /**
     * Is variable const.
     * @return true if const, false if not
     */
    bool isConst() const {
        return getFlag(fIsConst);
    }

    /**
     * Is variable a throw type.
     * @return true if throw type, false if not
     */
    bool isThrow() const {
        return mAccess == AccessControl::Throw;
    }

    /**
     * Is variable a user defined (or unknown) type.
     * @return true if user defined type, false if not
     */
    bool isClass() const {
        return getFlag(fIsClass);
    }

    /**
     * Is variable an array.
     * @return true if array, false if not
     */
    bool isArray() const {
        return getFlag(fIsArray) && !getFlag(fIsPointer);
    }

    /**
     * Is pointer variable.
     * @return true if pointer, false otherwise
     */
    bool isPointer() const {
        return getFlag(fIsPointer);
    }

    /**
     * Is variable a pointer to an array
     * @return true if pointer to array, false otherwise
     */
    bool isPointerToArray() const {
        return isPointer() && getFlag(fIsArray);
    }

    /**
     * Is variable an array of pointers
     * @return true if array or pointers, false otherwise
     */
    bool isPointerArray() const;

    /**
     * Is array or pointer variable.
     * @return true if pointer or array, false otherwise
     */
    bool isArrayOrPointer() const {
        return getFlag(fIsArray) || getFlag(fIsPointer);
    }

    /**
     * Is reference variable.
     * @return true if reference, false otherwise
     */
    bool isReference() const {
        return getFlag(fIsReference);
    }

    /**
     * Is reference variable.
     * @return true if reference, false otherwise
     */
    bool isRValueReference() const {
        return getFlag(fIsRValueRef);
    }

    /**
     * Is variable unsigned.
     * @return true only if variable _is_ unsigned. if the sign is unknown, false is returned.
     */
    bool isUnsigned() const;

    /**
     * Does variable have a default value.
     * @return true if has a default falue, false if not
     */
    bool hasDefault() const {
        return getFlag(fHasDefault);
    }

    /**
     * Is variable initialized in its declaration
     * @return true if variable declaration contains initialization
     */
    bool isInit() const {
        return getFlag(fIsInit);
    }

    /**
     * Get Type pointer of known type.
     * @return pointer to type if known, NULL if not known
     */
    const Type *type() const {
        return mType;
    }

    /**
     * Get Scope pointer of known type.
     * @return pointer to type scope if known, NULL if not known
     */
    const Scope *typeScope() const {
        return mType ? mType->classScope : nullptr;
    }

    /**
     * Get Scope pointer of enclosing scope.
     * @return pointer to enclosing scope
     */
    const Scope *scope() const {
        return mScope;
    }

    /**
     * Get array dimensions.
     * @return array dimensions vector
     */
    const std::vector<Dimension> &dimensions() const {
        return mDimensions;
    }

    /**
     * Get array dimension length.
     * @return length of dimension
     */
    MathLib::bigint dimension(nonneg int index_) const {
        return mDimensions[index_].num;
    }

    /**
     * Get array dimension known.
     * @return length of dimension known
     */
    bool dimensionKnown(nonneg int index_) const {
        return mDimensions[index_].known;
    }

    /**
     * Checks if the variable is an STL type ('std::')
     * E.g.:
     *   std::string s;
     *   ...
     *   sVar->isStlType() == true
     * @return true if it is an stl type and its type matches any of the types in 'stlTypes'
     */
    bool isStlType() const {
        return getFlag(fIsStlType);
    }

    /**
     * Checks if the variable is an STL type ('std::')
     * E.g.:
     *   std::string s;
     *   ...
     *   sVar->isStlType() == true
     * @return true if it is an stl type and its type matches any of the types in 'stlTypes'
     */
    bool isStlStringType() const {
        return getFlag(fIsStlString);
    }

    bool isStlStringViewType() const;

    bool isSmartPointer() const {
        return getFlag(fIsSmartPointer);
    }

    const Type* smartPointerType() const;
    const Type* iteratorType() const;

    /**
     * Checks if the variable is of any of the STL types passed as arguments ('std::')
     * E.g.:
     *   std::string s;
     *   ...
     *   const char *str[] = {"string", "wstring"};
     *   sVar->isStlType(str) == true
     * @param stlType stl type
     * @return true if it is an stl type and its type matches any of the types in 'stlTypes'
     */
    bool isStlType(const std::string& stlType) const {
        return isStlType() && stlType==mTypeStartToken->strAt(2);
    }

    /**
     * Checks if the variable is of any of the STL types passed as arguments ('std::')
     * E.g.:
     *   std::string s;
     *   ...
     *   const std::set<std::string> str = make_container< std::set<std::string> >() << "string" << "wstring";
     *   sVar->isStlType(str) == true
     * @param stlTypes set of stl types
     * @return true if it is an stl type and its type matches any of the types in 'stlTypes'
     */
    bool isStlType(const std::set<std::string>& stlTypes) const {
        return isStlType() && stlTypes.find(mTypeStartToken->strAt(2))!=stlTypes.end();
    }

    /**
     * Determine whether it's a floating number type
     * @return true if the type is known and it's a floating type (float, double and long double) or a pointer/array to it
     */
    bool isFloatingType() const {
        return getFlag(fIsFloatType);
    }

    /**
     * Determine whether it's an enumeration type
     * @return true if the type is known and it's an enumeration type
     */
    bool isEnumType() const {
        return type() && type()->isEnumType();
    }

    bool isMaybeUnused() const {
        return getFlag(fIsMaybeUnused);
    }

    const ValueType *valueType() const {
        return mValueType;
    }

    void setValueType(const ValueType &valueType);

    AccessControl accessControl() const {
        return mAccess;
    }

    std::string getTypeName() const;

private:
    // only symbol database can change the type
    friend class SymbolDatabase;

    /**
     * Set Type pointer to known type.
     * @param t type
     */
    void type(const Type * t) {
        mType = t;
    }

    /** @brief variable name token */
    const Token *mNameToken;

    /** @brief variable type start token */
    const Token *mTypeStartToken;

    /** @brief variable type end token */
    const Token *mTypeEndToken;

    /** @brief order declared */
    nonneg int mIndex;

    /** @brief what section is this variable declared in? */
    AccessControl mAccess;  // public/protected/private

    /** @brief flags */
    unsigned int mFlags;

    /** @brief pointer to user defined type info (for known types) */
    const Type *mType;

    /** @brief pointer to scope this variable is in */
    const Scope *mScope;

    const ValueType* mValueType{};

    /** @brief array dimensions */
    std::vector<Dimension> mDimensions;

    /** @brief fill in information, depending on Tokens given at instantiation */
    void evaluate(const Settings* settings);
};

class CPPCHECKLIB Function {
    // only symbol database can change this
    friend class SymbolDatabase;

    /** @brief flags mask used to access specific bit. */
    enum {
        fHasBody               = (1 << 0),  ///< @brief has implementation
        fIsInline              = (1 << 1),  ///< @brief implementation in class definition
        fIsConst               = (1 << 2),  ///< @brief is const
        fHasVirtualSpecifier   = (1 << 3),  ///< @brief does declaration contain 'virtual' specifier
        fIsPure                = (1 << 4),  ///< @brief is pure virtual
        fIsStatic              = (1 << 5),  ///< @brief is static
        fIsStaticLocal         = (1 << 6),  ///< @brief is static local
        fIsExtern              = (1 << 7),  ///< @brief is extern
        fIsFriend              = (1 << 8),  ///< @brief is friend
        fIsExplicit            = (1 << 9),  ///< @brief is explicit
        fIsDefault             = (1 << 10), ///< @brief is default
        fIsDelete              = (1 << 11), ///< @brief is delete
        fHasOverrideSpecifier  = (1 << 12), ///< @brief does declaration contain 'override' specifier?
        fHasFinalSpecifier     = (1 << 13), ///< @brief does declaration contain 'final' specifier?
        fIsNoExcept            = (1 << 14), ///< @brief is noexcept
        fIsThrow               = (1 << 15), ///< @brief is throw
        fIsOperator            = (1 << 16), ///< @brief is operator
        fHasLvalRefQual        = (1 << 17), ///< @brief has & lvalue ref-qualifier
        fHasRvalRefQual        = (1 << 18), ///< @brief has && rvalue ref-qualifier
        fIsVariadic            = (1 << 19), ///< @brief is variadic
        fIsVolatile            = (1 << 20), ///< @brief is volatile
        fHasTrailingReturnType = (1 << 21), ///< @brief has trailing return type
        fIsEscapeFunction      = (1 << 22), ///< @brief Function throws or exits
        fIsInlineKeyword       = (1 << 23), ///< @brief Function has "inline" keyword
        fIsConstexpr           = (1 << 24), ///< @brief is constexpr
    };

    /**
     * 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:
    enum Type { eConstructor, eCopyConstructor, eMoveConstructor, eOperatorEqual, eDestructor, eFunction, eLambda };

    Function(const Tokenizer *mTokenizer, const Token *tok, const Scope *scope, const Token *tokDef, const Token *tokArgDef);
    Function(const Token *tokenDef, const std::string &clangType);

    const std::string &name() const {
        return tokenDef->str();
    }

    std::string fullName() const;

    nonneg int argCount() const {
        return argumentList.size();
    }
    nonneg int minArgCount() const {
        return argumentList.size() - initArgCount;
    }
    const Variable* getArgumentVar(nonneg int num) const;
    nonneg int initializedArgCount() const {
        return initArgCount;
    }
    void addArguments(const SymbolDatabase *symbolDatabase, const Scope *scope);

    /** @brief check if this function is virtual in the base classes */
    bool isImplicitlyVirtual(bool defaultVal = false) const;

    std::vector<const Function*> getOverloadedFunctions() const;

    /** @brief get function in base class that is overridden */
    const Function *getOverriddenFunction(bool *foundAllBaseClasses = nullptr) const;

    bool isLambda() const {
        return type==eLambda;
    }

    bool isConstructor() const {
        return type==eConstructor ||
               type==eCopyConstructor ||
               type==eMoveConstructor;
    }

    bool isDestructor() const {
        return type==eDestructor;
    }
    bool isAttributeConstructor() const {
        return tokenDef->isAttributeConstructor();
    }
    bool isAttributeDestructor() const {
        return tokenDef->isAttributeDestructor();
    }
    bool isAttributePure() const {
        return tokenDef->isAttributePure();
    }
    bool isAttributeConst() const {
        return tokenDef->isAttributeConst();
    }
    bool isAttributeNoreturn() const {
        return tokenDef->isAttributeNoreturn();
    }
    bool isAttributeNothrow() const {
        return tokenDef->isAttributeNothrow();
    }
    bool isAttributeNodiscard() const {
        return tokenDef->isAttributeNodiscard();
    }

    bool hasBody() const {
        return getFlag(fHasBody);
    }
    bool isInline() const {
        return getFlag(fIsInline);
    }
    bool isConst() const {
        return getFlag(fIsConst);
    }
    bool hasVirtualSpecifier() const {
        return getFlag(fHasVirtualSpecifier);
    }
    bool isPure() const {
        return getFlag(fIsPure);
    }
    bool isStatic() const {
        return getFlag(fIsStatic);
    }
    bool isStaticLocal() const {
        return getFlag(fIsStaticLocal);
    }
    bool isExtern() const {
        return getFlag(fIsExtern);
    }
    bool isFriend() const {
        return getFlag(fIsFriend);
    }
    bool isExplicit() const {
        return getFlag(fIsExplicit);
    }
    bool isDefault() const {
        return getFlag(fIsDefault);
    }
    bool isDelete() const {
        return getFlag(fIsDelete);
    }
    bool isNoExcept() const {
        return getFlag(fIsNoExcept);
    }
    bool isThrow() const {
        return getFlag(fIsThrow);
    }
    bool hasOverrideSpecifier() const {
        return getFlag(fHasOverrideSpecifier);
    }
    bool hasFinalSpecifier() const {
        return getFlag(fHasFinalSpecifier);
    }
    bool isOperator() const {
        return getFlag(fIsOperator);
    }
    bool hasLvalRefQualifier() const {
        return getFlag(fHasLvalRefQual);
    }
    bool hasRvalRefQualifier() const {
        return getFlag(fHasRvalRefQual);
    }
    bool isVariadic() const {
        return getFlag(fIsVariadic);
    }
    bool isVolatile() const {
        return getFlag(fIsVolatile);
    }
    bool hasTrailingReturnType() const {
        return getFlag(fHasTrailingReturnType);
    }
    void hasBody(bool state) {
        setFlag(fHasBody, state);
    }
    bool isInlineKeyword() const {
        return getFlag(fIsInlineKeyword);
    }

    bool isEscapeFunction() const {
        return getFlag(fIsEscapeFunction);
    }
    void isEscapeFunction(bool state) {
        setFlag(fIsEscapeFunction, state);
    }

    bool isConstexpr() const {
        return getFlag(fIsConstexpr);
    }
    void isConstexpr(bool state) {
        setFlag(fIsConstexpr, state);
    }
    bool isSafe(const Settings *settings) const;

    const Token* tokenDef{};          ///< function name token in class definition
    const Token* argDef{};            ///< function argument start '(' in class definition
    const Token* token{};             ///< function name token in implementation
    const Token* arg{};               ///< function argument start '('
    const Token* retDef{};            ///< function return type token
    const ::Type* retType{};          ///< function return type
    const Scope* functionScope{};     ///< scope of function body
    const Scope* nestedIn{};          ///< Scope the function is declared in
    std::list<Variable> argumentList; ///< argument list, must remain list due to clangimport usage!
    nonneg int initArgCount{};        ///< number of args with default values
    Type type = eFunction;            ///< constructor, destructor, ...
    const Token* noexceptArg{};       ///< noexcept token
    const Token* throwArg{};          ///< throw token
    const Token* templateDef{};       ///< points to 'template <' before function
    const Token* functionPointerUsage{}; ///< function pointer usage
    AccessControl access{};           ///< public/protected/private

    bool argsMatch(const Scope *scope, const Token *first, const Token *second, const std::string &path, nonneg int path_length) const;

    static bool returnsConst(const Function* function, bool unknown = false);

    static bool returnsPointer(const Function* function, bool unknown = false);
    static bool returnsReference(const Function* function, bool unknown = false, bool includeRValueRef = false);
    static bool returnsStandardType(const Function* function, bool unknown = false);

    static bool returnsVoid(const Function* function, bool unknown = false);

    static std::vector<const Token*> findReturns(const Function* f);

    const Token* returnDefEnd() const {
        if (this->hasTrailingReturnType())
            return Token::findmatch(retDef, "{|;");
        return tokenDef;
    }

    /**
     * @return token to ":" if the function is a constructor
     * and it contains member initialization otherwise a nullptr is returned
     */
    const Token * constructorMemberInitialization() const;

private:
    /** Recursively determine if this function overrides a virtual function in a base class */
    const Function * getOverriddenFunctionRecursive(const ::Type* baseType, bool *foundAllBaseClasses) const;

    unsigned int mFlags{};

    void isInline(bool state) {
        setFlag(fIsInline, state);
    }
    void isConst(bool state) {
        setFlag(fIsConst, state);
    }
    void hasVirtualSpecifier(bool state) {
        setFlag(fHasVirtualSpecifier, state);
    }
    void isPure(bool state) {
        setFlag(fIsPure, state);
    }
    void isStatic(bool state) {
        setFlag(fIsStatic, state);
    }
    void isStaticLocal(bool state) {
        setFlag(fIsStaticLocal, state);
    }
    void isExtern(bool state) {
        setFlag(fIsExtern, state);
    }
    void isFriend(bool state) {
        setFlag(fIsFriend, state);
    }
    void isExplicit(bool state) {
        setFlag(fIsExplicit, state);
    }
    void isDefault(bool state) {
        setFlag(fIsDefault, state);
    }
    void isDelete(bool state) {
        setFlag(fIsDelete, state);
    }
    void isNoExcept(bool state) {
        setFlag(fIsNoExcept, state);
    }
    void isThrow(bool state) {
        setFlag(fIsThrow, state);
    }
    void isOperator(bool state) {
        setFlag(fIsOperator, state);
    }
    void hasLvalRefQualifier(bool state) {
        setFlag(fHasLvalRefQual, state);
    }
    void hasRvalRefQualifier(bool state) {
        setFlag(fHasRvalRefQual, state);
    }
    void isVariadic(bool state) {
        setFlag(fIsVariadic, state);
    }
    void isVolatile(bool state) {
        setFlag(fIsVolatile, state);
    }
    void hasTrailingReturnType(bool state) {
        return setFlag(fHasTrailingReturnType, state);
    }
    void isInlineKeyword(bool state) {
        setFlag(fIsInlineKeyword, state);
    }
    const Token *setFlags(const Token *tok1, const Scope *scope);
};

class CPPCHECKLIB Scope {
    // let tests access private function for testing
    friend class TestSymbolDatabase;

public:
    struct UsingInfo {
        const Token *start;
        const Scope *scope;
    };

    enum ScopeType { eGlobal, eClass, eStruct, eUnion, eNamespace, eFunction, eIf, eElse, eFor, eWhile, eDo, eSwitch, eUnconditional, eTry, eCatch, eLambda, eEnum };

    Scope(const SymbolDatabase *check_, const Token *classDef_, const Scope *nestedIn_);
    Scope(const SymbolDatabase *check_, const Token *classDef_, const Scope *nestedIn_, ScopeType type_, const Token *start_);

    const SymbolDatabase* check{};
    std::string className;
    const Token* classDef{};   ///< class/struct/union/namespace token
    const Token* bodyStart{};  ///< '{' token
    const Token* bodyEnd{};    ///< '}' token
    std::list<Function> functionList;
    std::multimap<std::string, const Function *> functionMap;
    std::list<Variable> varlist;
    const Scope* nestedIn{};
    std::vector<Scope *> nestedList;
    nonneg int numConstructors{};
    nonneg int numCopyOrMoveConstructors{};
    std::vector<UsingInfo> usingList;
    ScopeType type{};
    Type* definedType{};
    std::map<std::string, Type*> definedTypesMap;
    std::vector<const Token *> bodyStartList;

    // function specific fields
    const Scope* functionOf{}; ///< scope this function belongs to
    Function* function{}; ///< function info for this function

    // enum specific fields
    const Token* enumType{};
    bool enumClass{};

    std::vector<Enumerator> enumeratorList;

    void setBodyStartEnd(const Token *start) {
        bodyStart = start;
        bodyEnd = start ? start->link() : nullptr;
        if (start)
            bodyStartList.push_back(start);
    }

    bool isAnonymous() const {
        // TODO: Check if class/struct is anonymous
        return className.size() > 9 && startsWith(className,"Anonymous") && std::isdigit(className[9]);
    }

    const Enumerator * findEnumerator(const std::string & name) const {
        auto it = std::find_if(enumeratorList.cbegin(), enumeratorList.cend(), [&](const Enumerator& i) {
            return i.name->str() == name;
        });
        return it == enumeratorList.end() ? nullptr : &*it;
    }

    bool isNestedIn(const Scope * outer) const {
        if (!outer)
            return false;
        if (outer == this)
            return true;
        const Scope * parent = nestedIn;
        while (outer != parent && parent)
            parent = parent->nestedIn;
        return parent && parent == outer;
    }

    static Function* nestedInFunction(const Scope* scope) {
        while (scope) {
            if (scope->type == Scope::eFunction)
                break;
            scope = scope->nestedIn;
        }
        if (!scope)
            return nullptr;
        return scope->function;
    }

    bool isClassOrStruct() const {
        return (type == eClass || type == eStruct);
    }

    bool isClassOrStructOrUnion() const {
        return (type == eClass || type == eStruct || type == eUnion);
    }

    bool isExecutable() const {
        return type != eClass && type != eStruct && type != eUnion && type != eGlobal && type != eNamespace && type != eEnum;
    }

    bool isLoopScope() const {
        return type == Scope::ScopeType::eFor || type == Scope::ScopeType::eWhile || type == Scope::ScopeType::eDo;
    }

    bool isLocal() const {
        return (type == eIf || type == eElse ||
                type == eFor || type == eWhile || type == eDo ||
                type == eSwitch || type == eUnconditional ||
                type == eTry || type == eCatch);
    }

    // Is there lambda/inline function(s) in this scope?
    bool hasInlineOrLambdaFunction() const;

    /**
     * @brief find a function
     * @param tok token of function call
     * @param requireConst if const refers to a const variable only const methods should be matched
     * @return pointer to function if found or NULL if not found
     */
    const Function *findFunction(const Token *tok, bool requireConst=false) const;

    const Scope *findRecordInNestedList(const std::string & name, bool isC = false) const;
    Scope *findRecordInNestedList(const std::string & name) {
        return const_cast<Scope *>(const_cast<const Scope *>(this)->findRecordInNestedList(name));
    }

    const Type* findType(const std::string& name) const;
    Type* findType(const std::string& name) {
        return const_cast<Type*>(const_cast<const Scope *>(this)->findType(name));
    }

    /**
     * @brief find if name is in nested list
     * @param name name of nested scope
     */
    Scope *findInNestedListRecursive(const std::string & name);

    void addVariable(const Token *token_, const Token *start_,
                     const Token *end_, AccessControl access_, const Type *type_,
                     const Scope *scope_, const Settings* settings);

    /** @brief initialize varlist */
    void getVariableList(const Settings* settings);

    const Function *getDestructor() const;

    void addFunction(Function func) {
        functionList.push_back(std::move(func));

        const Function * back = &functionList.back();

        functionMap.insert(make_pair(back->tokenDef->str(), back));
    }

    AccessControl defaultAccess() const;

    /**
     * @brief check if statement is variable declaration and add it if it is
     * @param tok pointer to start of statement
     * @param varaccess access control of statement
     * @param settings Settings
     * @return pointer to last token
     */
    const Token *checkVariable(const Token *tok, AccessControl varaccess, const Settings* settings);

    /**
     * @brief get variable from name
     * @param varname name of variable
     * @return pointer to variable
     */
    const Variable *getVariable(const std::string &varname) const;

    const Token * addEnum(const Token * tok, bool isCpp);

    const Scope *findRecordInBase(const std::string &name) const;

    std::vector<const Scope*> findAssociatedScopes() const;

private:
    /**
     * @brief helper function for getVariableList()
     * @param tok pointer to token to check
     * @param vartok populated with pointer to the variable token, if found
     * @param typetok populated with pointer to the type token, if found
     * @return true if tok points to a variable declaration, false otherwise
     */
    bool isVariableDeclaration(const Token* const tok, const Token*& vartok, const Token*& typetok) const;

    void findFunctionInBase(const std::string & name, nonneg int args, std::vector<const Function *> & matches) const;

    /** @brief initialize varlist */
    void getVariableList(const Settings* settings, const Token *start, const Token *end);
};

enum class Reference {
    None,
    LValue,
    RValue
};

/** Value type */
class CPPCHECKLIB ValueType {
public:
    enum Sign { UNKNOWN_SIGN, SIGNED, UNSIGNED } sign = UNKNOWN_SIGN;
    enum Type {
        UNKNOWN_TYPE,
        POD,
        NONSTD,
        RECORD,
        SMART_POINTER,
        CONTAINER,
        ITERATOR,
        VOID,
        BOOL,
        CHAR,
        SHORT,
        WCHAR_T,
        INT,
        LONG,
        LONGLONG,
        UNKNOWN_INT,
        FLOAT,
        DOUBLE,
        LONGDOUBLE
    } type = UNKNOWN_TYPE;
    nonneg int bits{};                         ///< bitfield bitcount
    nonneg int pointer{};                      ///< 0=>not pointer, 1=>*, 2=>**, 3=>***, etc
    nonneg int constness{};                    ///< bit 0=data, bit 1=*, bit 2=**
    Reference reference = Reference::None;     ///< Is the outermost indirection of this type a reference or rvalue
    ///< reference or not? pointer=2, Reference=LValue would be a T**&
    const Scope* typeScope{};                  ///< if the type definition is seen this point out the type scope
    const ::Type* smartPointerType{};          ///< Smart pointer type
    const Token* smartPointerTypeToken{};      ///< Smart pointer type token
    const Library::SmartPointer* smartPointer{}; ///< Smart pointer
    const Library::Container* container{};     ///< If the type is a container defined in a cfg file, this is the used
    ///< container
    const Token* containerTypeToken{}; ///< The container type token. the template argument token that defines the
    ///< container element type.
    std::string originalTypeName;    ///< original type name as written in the source code. eg. this might be "uint8_t"
    ///< when type is CHAR.
    ErrorPath debugPath; ///< debug path to the type

    ValueType() = default;
    ValueType(enum Sign s, enum Type t, nonneg int p)
        : sign(s),
        type(t),
        pointer(p)
    {}
    ValueType(enum Sign s, enum Type t, nonneg int p, nonneg int c)
        : sign(s),
        type(t),
        pointer(p),
        constness(c)
    {}
    ValueType(enum Sign s, enum Type t, nonneg int p, nonneg int c, std::string otn)
        : sign(s),
        type(t),
        pointer(p),
        constness(c),
        originalTypeName(std::move(otn))
    {}

    static ValueType parseDecl(const Token *type, const Settings &settings);

    static Type typeFromString(const std::string &typestr, bool longType);

    enum class MatchResult { UNKNOWN, SAME, FALLBACK1, FALLBACK2, NOMATCH };
    static MatchResult matchParameter(const ValueType *call, const ValueType *func);
    static MatchResult matchParameter(const ValueType *call, const Variable *callVar, const Variable *funcVar);

    bool isPrimitive() const {
        return (type >= ValueType::Type::BOOL);
    }

    bool isIntegral() const {
        return (type >= ValueType::Type::BOOL && type <= ValueType::Type::UNKNOWN_INT);
    }

    bool isFloat() const {
        return (type >= ValueType::Type::FLOAT && type <= ValueType::Type::LONGDOUBLE);
    }

    bool fromLibraryType(const std::string &typestr, const Settings &settings);

    bool isEnum() const {
        return typeScope && typeScope->type == Scope::eEnum;
    }

    bool isConst(nonneg int indirect = 0) const;

    MathLib::bigint typeSize(const cppcheck::Platform &platform, bool p=false) const;

    /// Check if type is the same ignoring const and references
    bool isTypeEqual(const ValueType* that) const;

    std::string str() const;
    std::string dump() const;

    void setDebugPath(const Token* tok, SourceLocation ctx, SourceLocation local = SourceLocation::current());
};


class CPPCHECKLIB SymbolDatabase {
    friend class TestSymbolDatabase;
public:
    SymbolDatabase(Tokenizer& tokenizer, const Settings& settings, ErrorLogger* errorLogger);
    ~SymbolDatabase();

    /** @brief Information about all namespaces/classes/structures */
    std::list<Scope> scopeList;

    /** @brief Fast access to function scopes */
    std::vector<const Scope*> functionScopes;

    /** @brief Fast access to class and struct scopes */
    std::vector<const Scope*> classAndStructScopes;

    /** @brief Fast access to types */
    std::list<Type> typeList;

    /**
     * @brief find a variable type if it's a user defined type
     * @param start scope to start looking in
     * @param typeTok token containing variable type
     * @return pointer to type if found or NULL if not found
     */
    const Type* findVariableType(const Scope* start, const Token* typeTok) const;

    /**
     * @brief find a function
     * @param tok token of function call
     * @return pointer to function if found or NULL if not found
     */
    const Function* findFunction(const Token* tok) const;

    /** For unit testing only */
    const Scope* findScopeByName(const std::string& name) const;

    const Type* findType(const Token* startTok, const Scope* startScope, bool lookOutside = false) const;
    Type* findType(const Token* startTok, Scope* startScope, bool lookOutside = false)
    {
        return const_cast<Type*>(this->findType(startTok, const_cast<const Scope*>(startScope), lookOutside));
    }

    const Scope *findScope(const Token *tok, const Scope *startScope) const;
    Scope *findScope(const Token *tok, Scope *startScope) {
        return const_cast<Scope *>(this->findScope(tok, const_cast<const Scope *>(startScope)));
    }

    // cppcheck-suppress unusedFunction
    bool isVarId(nonneg int varid) const {
        return varid < mVariableList.size();
    }

    const Variable *getVariableFromVarId(nonneg int varId) const {
        return mVariableList.at(varId);
    }

    const std::vector<const Variable *> & variableList() const {
        return mVariableList;
    }

    /**
     * @brief output a debug message
     */
    void debugMessage(const Token *tok, const std::string &type, const std::string &msg) const;

    void printOut(const char * title = nullptr) const;
    void printVariable(const Variable *var, const char *indent) const;
    void printXml(std::ostream &out) const;

    bool isCPP() const;

    /*
     * @brief Do a sanity check
     */
    void validate() const;

    void validateExecutableScopes() const;
    /**
     * @brief Check variable list, e.g. variables w/o scope
     */
    void validateVariables() const;

    /** Set valuetype in provided tokenlist */
    void setValueTypeInTokenList(bool reportDebugWarnings, Token *tokens=nullptr);

    /**
     * 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.
     */
    nonneg int sizeOfType(const Token *type) const;

    /** Set array dimensions when valueflow analysis is completed */
    void setArrayDimensionsUsingValueFlow(); // cppcheck-suppress functionConst // has side effects

    void clangSetVariables(const std::vector<const Variable *> &variableList);
    void createSymbolDatabaseExprIds();

private:
    friend class Scope;
    friend class Function;

    // Create symboldatabase...
    void createSymbolDatabaseFindAllScopes();
    void createSymbolDatabaseClassInfo();
    void createSymbolDatabaseVariableInfo();
    void createSymbolDatabaseCopyAndMoveConstructors();
    void createSymbolDatabaseFunctionScopes();
    void createSymbolDatabaseClassAndStructScopes();
    void createSymbolDatabaseFunctionReturnTypes();
    void createSymbolDatabaseNeedInitialization();
    void createSymbolDatabaseVariableSymbolTable();
    void createSymbolDatabaseSetScopePointers();
    void createSymbolDatabaseSetFunctionPointers(bool firstPass); // cppcheck-suppress functionConst // has side effects
    void createSymbolDatabaseSetVariablePointers();
    // cppcheck-suppress functionConst
    void createSymbolDatabaseSetTypePointers();
    void createSymbolDatabaseSetSmartPointerType();
    void createSymbolDatabaseEnums(); // cppcheck-suppress functionConst // has side effects
    void createSymbolDatabaseEscapeFunctions(); // cppcheck-suppress functionConst // has side effects
    // cppcheck-suppress functionConst
    void createSymbolDatabaseIncompleteVars();

    void debugSymbolDatabase() const;

    void addClassFunction(Scope **scope, const Token **tok, const Token *argStart);
    Function *addGlobalFunctionDecl(Scope*& scope, const Token* tok, const Token *argStart, const Token* funcStart);
    Function *addGlobalFunction(Scope*& scope, const Token*& tok, const Token *argStart, const Token* funcStart);
    void addNewFunction(Scope **scope, const Token **tok);
    bool isFunction(const Token *tok, const Scope* outerScope, const Token **funcStart, const Token **argStart, const Token** declEnd) const;
    const Type *findTypeInNested(const Token *startTok, const Scope *startScope) const;
    const Scope *findNamespace(const Token * tok, const Scope * scope) const;
    static Function *findFunctionInScope(const Token *func, const Scope *ns, const std::string & path, nonneg int path_length);
    static const Type *findVariableTypeInBase(const Scope *scope, const Token *typeTok);

    using MemberIdMap = std::map<unsigned int, unsigned int>;
    using VarIdMap = std::map<unsigned int, MemberIdMap>;

    void fixVarId(VarIdMap & varIds, const Token * vartok, Token * membertok, const Variable * membervar);

    /** Whether iName is a keyword as defined in http://en.cppreference.com/w/c/keyword and http://en.cppreference.com/w/cpp/keyword*/
    bool isReservedName(const std::string& iName) const;

    const Enumerator * findEnumerator(const Token * tok, std::set<std::string>& tokensThatAreNotEnumeratorValues) const;

    void setValueType(Token* tok, const ValueType& valuetype, SourceLocation loc = SourceLocation::current());
    void setValueType(Token* tok, const Variable& var, SourceLocation loc = SourceLocation::current());
    void setValueType(Token* tok, const Enumerator& enumerator, SourceLocation loc = SourceLocation::current());

    Tokenizer& mTokenizer;
    const Settings &mSettings;
    ErrorLogger *mErrorLogger;

    /** variable symbol table */
    std::vector<const Variable *> mVariableList;

    /** list for missing types */
    std::list<Type> mBlankTypes;

    bool mIsCpp;
    ValueType::Sign mDefaultSignedness;
};


//---------------------------------------------------------------------------
#endif // symboldatabaseH