Symbol.h

/* This file is part of RTags (https://github.com/Andersbakken/rtags).

   RTags 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.

   RTags 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 RTags.  If not, see <https://www.gnu.org/licenses/>. */

#ifndef RTagsCursor_h
#define RTagsCursor_h

#include <clang-c/Index.h>
#include <memory>
#include <stdint.h>

#include "Location.h"
#include "Sandbox.h"
#include "rct/Flags.h"
#include "rct/List.h"
#include "rct/Serializer.h"
#include "rct/String.h"
#include "rct/Value.h"

class Project;
struct Symbol
{
    Symbol()
        : symbolLength(0), kind(CXCursor_FirstInvalid), type(CXType_Invalid), linkage(CXLinkage_Invalid),
          enumValue(0), startLine(-1), endLine(-1), flags(None), startColumn(-1), endColumn(-1),
          size(0), fieldOffset(-1), alignment(-1)
    {}

    Location location;
    String symbolName, usr, typeName;
    List<String> baseClasses;
    struct Argument {
        Argument()
            : length(0)
        {}
        Location location, cursor;
        size_t length;

        void clear()
        {
            location.clear();
            cursor.clear();
            length = 0;
        }
    };
    List<Argument> arguments;
    struct ArgumentUsage {
        ArgumentUsage()
            : index(String::npos)
        {}
        void clear()
        {
            invocation.clear();
            invokedFunction.clear();
            argument.clear();
            index = String::npos;
        }
        Location invocation, invokedFunction;
        Argument argument;
        size_t index;
    } argumentUsage; // set for references that are used as an argument only

    uint16_t symbolLength;
    CXCursorKind kind;
    CXTypeKind type;
    CXLinkageKind linkage;
    enum Flag {
        None                   = 0x0000,
        VirtualMethod          = 0x0001,
        PureVirtualMethod      = 0x0002|VirtualMethod,
        StaticMethod           = 0x0004,
        ConstMethod            = 0x0008,
        Variadic               = 0x0010,
        Auto                   = 0x0020,
        MacroExpansion         = 0x0040,
        TemplateSpecialization = 0x0080,
        InlineFunction         = 0x0100,
        ImplicitDestruction    = 0x0200,
        TemplateReference      = 0x0400,
        Definition             = 0x0800,
        FileSymbol             = 0x1000,
        TemplateFunction       = 0x2000
    };
    String mangledName, briefComment, xmlComment;
    union {
        int32_t stackCost; // cost for function definitions
        int64_t enumValue; // only used if type == CXCursor_EnumConstantDecl
    };
    int32_t startLine, endLine;
    uint16_t flags;
    int16_t startColumn, endColumn;
    uint16_t size; // sizeof
    int16_t fieldOffset, alignment; // bits

    bool isNull() const { return location.isNull() || clang_isInvalid(kind); }
    void clear()
    {
        location.clear();
        argumentUsage = ArgumentUsage();
        symbolName.clear();
        usr.clear();
        typeName.clear();
        baseClasses.clear();
        arguments.clear();
        symbolLength = 0;
        kind = CXCursor_FirstInvalid;
        type = CXType_Invalid;
        enumValue = 0;
        flags = 0;
        mangledName.clear();
        briefComment.clear();
        xmlComment.clear();
        startLine = startColumn = endLine = endColumn = size = fieldOffset = alignment = -1;
    }

    uint16_t targetsValue() const;
    static bool isClass(CXCursorKind kind)
    {
        switch (kind) {
        case CXCursor_ClassDecl:
        case CXCursor_ClassTemplate:
        case CXCursor_StructDecl:
            return true;
        default:
            break;
        }
        return false;
    }

    bool isClass() const { return isClass(kind); }
    bool isConstructorOrDestructor() const
    {
        switch (kind) {
        case CXCursor_Constructor:
        case CXCursor_Destructor:
            return true;
        default:
            break;
        }
        return false;
    }
    bool isReference() const;
    bool isContainer() const;

    inline bool isDefinition() const { return flags & Definition; }

    enum ToStringFlag {
        DefaultFlags = 0x00,
        IncludeTargets = 0x01,
        IncludeReferences = 0x02,
        IncludeParents = 0x04,
        IncludeBaseClasses = 0x08,
        IncludeContainingFunction = 0x10,
        IncludeContainingFunctionLocation = 0x20,
        IncludeSourceCode = 0x40
    };
    Value toValue(const List<std::shared_ptr<Project>> &projects,
                  Flags<ToStringFlag> toStringFlags,
                  Flags<Location::ToStringFlag> locationToStringFlags,
                  const Set<String> &pieceFilters) const;
    String toString(const List<std::shared_ptr<Project>> &projects = List<std::shared_ptr<Project>>(),
                    Flags<ToStringFlag> toStringFlags = DefaultFlags,
                    Flags<Location::ToStringFlag> = Flags<Location::ToStringFlag>(),
                    const Set<String> &pieceFilters = Set<String>()) const;
    String kindSpelling() const { return kindSpelling(kind); }
    String displayName() const;
    static String kindSpelling(uint16_t kind);

    bool operator<(const Symbol &other) const { return location < other.location; }
};

RCT_FLAGS(Symbol::ToStringFlag);

template <> inline Serializer &operator<<(Serializer &s, const Symbol::Argument &arg)
{
    s << arg.location << arg.cursor << arg.length;
    return s;
}

template <> inline Deserializer &operator>>(Deserializer &s, Symbol::Argument &arg)
{
    s >> arg.location >> arg.cursor >> arg.length;
    return s;
}

template <> inline Serializer &operator<<(Serializer &s, const Symbol::ArgumentUsage &usage)
{
    s << usage.index;
    if (usage.index != String::npos) {
        s << usage.invocation << usage.argument << usage.invokedFunction;
    }
    return s;
}

template <> inline Deserializer &operator>>(Deserializer &s, Symbol::ArgumentUsage &usage)
{
    s >> usage.index;
    if (usage.index != String::npos) {
        s >> usage.invocation >> usage.argument >> usage.invokedFunction;
    } else {
        usage.clear();
    }
    return s;
}

template <> inline Serializer &operator<<(Serializer &s, const Symbol &t)
{
    s << t.location << t.argumentUsage << t.symbolName << t.usr
      << t.typeName << t.baseClasses << t.arguments << t.symbolLength
      << static_cast<uint16_t>(t.kind) << static_cast<uint16_t>(t.type)
      << static_cast<uint8_t>(t.linkage) << t.flags << t.mangledName << t.briefComment << t.xmlComment
      << t.enumValue << t.startLine << t.endLine << t.startColumn << t.endColumn
      << t.size << t.fieldOffset << t.alignment;
    return s;
}

template <> inline Deserializer &operator>>(Deserializer &s, Symbol &t)
{
    uint16_t kind, type;
    uint8_t linkage;
    s >> t.location >> t.argumentUsage >> t.symbolName
      >> t.usr >> t.typeName >> t.baseClasses >> t.arguments
      >> t.symbolLength >> kind >> type >> linkage >> t.flags
      >> t.mangledName >> t.briefComment >> t.xmlComment >> t.enumValue
      >> t.startLine >> t.endLine >> t.startColumn >> t.endColumn
      >> t.size >> t.fieldOffset >> t.alignment;

    t.kind = static_cast<CXCursorKind>(kind);
    t.type = static_cast<CXTypeKind>(type);
    t.linkage = static_cast<CXLinkageKind>(linkage);

    Sandbox::decode(t.typeName);
    Sandbox::decode(t.symbolName);
    Sandbox::decode(t.usr);
    Sandbox::decode(t.briefComment);
    Sandbox::decode(t.xmlComment);
    return s;
}

static inline Log operator<<(Log dbg, const Symbol &symbol)
{
    const String out = "Symbol(" + symbol.toString() + ")";
    return (dbg << out);
}

#endif