//===-- Symbol.h ------------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef liblldb_Symbol_h_
#define liblldb_Symbol_h_

#include "lldb/lldb-private.h"
#include "lldb/Core/AddressRange.h"
#include "lldb/Core/Mangled.h"
#include "lldb/Core/UserID.h"
#include "lldb/Symbol/SymbolContextScope.h"

namespace lldb_private {

class Symbol :
    public SymbolContextScope
{
public:
    // ObjectFile readers can classify their symbol table entries and searches can be made
    // on specific types where the symbol values will have drastically different meanings
    // and sorting requirements.
    Symbol();

    Symbol (uint32_t symID,
            const char *name,
            bool name_is_mangled,
            lldb::SymbolType type,
            bool external,
            bool is_debug,
            bool is_trampoline,
            bool is_artificial,
            const lldb::SectionSP &section_sp,
            lldb::addr_t value,
            lldb::addr_t size,
            bool size_is_valid,
            bool contains_linker_annotations,
            uint32_t flags);

    Symbol (uint32_t symID,
            const Mangled &mangled,
            lldb::SymbolType type,
            bool external,
            bool is_debug,
            bool is_trampoline,
            bool is_artificial,
            const AddressRange &range,
            bool size_is_valid,
            bool contains_linker_annotations,
            uint32_t flags);

    Symbol (const Symbol& rhs);

    const Symbol&
    operator= (const Symbol& rhs);

    void
    Clear();

    bool
    Compare (const ConstString& name, lldb::SymbolType type) const;

    void
    Dump (Stream *s, Target *target, uint32_t index) const;

    bool
    ValueIsAddress() const;

    //------------------------------------------------------------------
    // The GetAddressRef() accessor functions should only be called if
    // you previously call ValueIsAddress() otherwise you might get an
    // reference to an Address object that contains an constant integer
    // value in m_addr_range.m_base_addr.m_offset which could be
    // incorrectly used to represent an absolute address since it has
    // no section.
    //------------------------------------------------------------------
    Address &
    GetAddressRef()
    {
        return m_addr_range.GetBaseAddress();
    }

    const Address &
    GetAddressRef() const
    {
        return m_addr_range.GetBaseAddress();
    }

    //------------------------------------------------------------------
    // Makes sure the symbol's value is an address and returns the file
    // address. Returns LLDB_INVALID_ADDRESS if the symbol's value isn't
    // an address.
    //------------------------------------------------------------------
    lldb::addr_t
    GetFileAddress () const;

    //------------------------------------------------------------------
    // Makes sure the symbol's value is an address and gets the load
    // address using \a target if it is. Returns LLDB_INVALID_ADDRESS
    // if the symbol's value isn't an address or if the section isn't
    // loaded in \a target.
    //------------------------------------------------------------------
    lldb::addr_t
    GetLoadAddress (Target *target) const;

    //------------------------------------------------------------------
    // Access the address value. Do NOT hand out the AddressRange as an
    // object as the byte size of the address range may not be filled in
    // and it should be accessed via GetByteSize().
    //------------------------------------------------------------------
    Address
    GetAddress() const
    {
        // Make sure the our value is an address before we hand a copy out.
        // We use the Address inside m_addr_range to contain the value for
        // symbols that are not address based symbols so we are using it
        // for more than just addresses. For example undefined symbols on
        // MacOSX have a nlist.n_value of 0 (zero) and this will get placed
        // into m_addr_range.m_base_addr.m_offset and it will have no section.
        // So in the GetAddress() accessor, we need to hand out an invalid
        // address if the symbol's value isn't an address.
        if (ValueIsAddress())
            return m_addr_range.GetBaseAddress();
        else
            return Address();
    }

    // When a symbol's value isn't an address, we need to access the raw
    // value. This function will ensure this symbol's value isn't an address
    // and return the integer value if this checks out, otherwise it will
    // return "fail_value" if the symbol is an address value.
    uint64_t
    GetIntegerValue (uint64_t fail_value = 0) const
    {
        if (ValueIsAddress())
        {
            // This symbol's value is an address. Use Symbol::GetAddress() to get the address.
            return fail_value;
        }
        else
        {
            // The value is stored in the base address' offset
            return m_addr_range.GetBaseAddress().GetOffset();
        }
    }

    lldb::addr_t
    ResolveCallableAddress(Target &target) const;

    ConstString
    GetName () const;

    ConstString
    GetNameNoArguments () const;

    ConstString
    GetDisplayName () const;
    
    uint32_t
    GetID() const
    {
        return m_uid;
    }

    lldb::LanguageType
    GetLanguage() const
    {
        // TODO: See if there is a way to determine the language for a symbol somehow, for now just return our best guess
        return m_mangled.GuessLanguage();
    }

    void
    SetID(uint32_t uid)
    {
        m_uid = uid;
    }

    Mangled&
    GetMangled ()
    {
        return m_mangled;
    }

    const Mangled&
    GetMangled () const
    {
        return m_mangled;
    }

    ConstString
    GetReExportedSymbolName() const;

    FileSpec
    GetReExportedSymbolSharedLibrary () const;
    
    void
    SetReExportedSymbolName(const ConstString &name);

    bool
    SetReExportedSymbolSharedLibrary (const FileSpec &fspec);
    
    Symbol *
    ResolveReExportedSymbol (Target &target) const;

    uint32_t
    GetSiblingIndex () const;

    lldb::SymbolType
    GetType () const
    {
        return (lldb::SymbolType)m_type;
    }

    void
    SetType (lldb::SymbolType type)
    {
        m_type = (lldb::SymbolType)type;
    }

    const char *
    GetTypeAsString () const;

    uint32_t
    GetFlags () const
    {
        return m_flags;
    }

    void
    SetFlags (uint32_t flags)
    {
        m_flags = flags;
    }

    void
    GetDescription (Stream *s, lldb::DescriptionLevel level, Target *target) const;

    bool
    IsSynthetic () const
    {
        return m_is_synthetic;
    }

    void
    SetIsSynthetic (bool b)
    {
        m_is_synthetic = b;
    }

    
    bool
    GetSizeIsSynthesized() const
    {
        return m_size_is_synthesized;
    }
    
    void
    SetSizeIsSynthesized(bool b)
    {
        m_size_is_synthesized = b;
    }

    bool
    IsDebug () const
    {
        return m_is_debug;
    }

    void
    SetDebug (bool b)
    {
        m_is_debug = b;
    }

    bool
    IsExternal () const
    {
        return m_is_external;
    }

    void
    SetExternal (bool b)
    {
        m_is_external = b;
    }

    bool
    IsTrampoline () const;

    bool
    IsIndirect () const;

    bool
    GetByteSizeIsValid () const
    {
        return m_size_is_valid;
    }

    lldb::addr_t
    GetByteSize () const;
    
    void
    SetByteSize (lldb::addr_t size)
    {
        m_size_is_valid = size > 0;
        m_addr_range.SetByteSize(size);
    }

    bool
    GetSizeIsSibling () const
    {
        return m_size_is_sibling;
    }

    void
    SetSizeIsSibling (bool b)
    {
        m_size_is_sibling = b;
    }

    // If m_type is "Code" or "Function" then this will return the prologue size
    // in bytes, else it will return zero.
    uint32_t
    GetPrologueByteSize ();

    bool
    GetDemangledNameIsSynthesized() const
    {
        return m_demangled_is_synthesized;
    }

    void
    SetDemangledNameIsSynthesized(bool b)
    {
        m_demangled_is_synthesized = b;
    }

    bool
    ContainsLinkerAnnotations() const
    {
        return m_contains_linker_annotations;
    }
    void
    SetContainsLinkerAnnotations(bool b)
    {
        m_contains_linker_annotations = b;
    }
    //------------------------------------------------------------------
    /// @copydoc SymbolContextScope::CalculateSymbolContext(SymbolContext*)
    ///
    /// @see SymbolContextScope
    //------------------------------------------------------------------
    void
    CalculateSymbolContext(SymbolContext *sc) override;

    lldb::ModuleSP
    CalculateSymbolContextModule() override;
    
    Symbol *
    CalculateSymbolContextSymbol() override;

    //------------------------------------------------------------------
    /// @copydoc SymbolContextScope::DumpSymbolContext(Stream*)
    ///
    /// @see SymbolContextScope
    //------------------------------------------------------------------
    void
    DumpSymbolContext(Stream *s) override;

    lldb::DisassemblerSP
    GetInstructions (const ExecutionContext &exe_ctx,
                     const char *flavor,
                     bool prefer_file_cache);
    
    bool
    GetDisassembly (const ExecutionContext &exe_ctx,
                    const char *flavor,
                    bool prefer_file_cache,
                    Stream &strm);

    bool
    ContainsFileAddress (lldb::addr_t file_addr) const;

protected:
    // This is the internal guts of ResolveReExportedSymbol, it assumes reexport_name is not null, and that module_spec
    // is valid.  We track the modules we've already seen to make sure we don't get caught in a cycle.
    
    Symbol *
    ResolveReExportedSymbolInModuleSpec (Target &target,
                                         ConstString &reexport_name,
                                         lldb_private::ModuleSpec &module_spec,
                                         lldb_private::ModuleList &seen_modules) const;
    
    uint32_t        m_uid;                  // User ID (usually the original symbol table index)
    uint16_t        m_type_data;            // data specific to m_type
    uint16_t        m_type_data_resolved:1, // True if the data in m_type_data has already been calculated
                    m_is_synthetic:1,       // non-zero if this symbol is not actually in the symbol table, but synthesized from other info in the object file.
                    m_is_debug:1,           // non-zero if this symbol is debug information in a symbol
                    m_is_external:1,        // non-zero if this symbol is globally visible
                    m_size_is_sibling:1,    // m_size contains the index of this symbol's sibling
                    m_size_is_synthesized:1,// non-zero if this symbol's size was calculated using a delta between this symbol and the next
                    m_size_is_valid:1,
                    m_demangled_is_synthesized:1, // The demangled name was created should not be used for expressions or other lookups
                    m_contains_linker_annotations:1, // The symbol name contains linker annotations, which are optional when doing name lookups
                    m_type:7;
    Mangled         m_mangled;              // uniqued symbol name/mangled name pair
    AddressRange    m_addr_range;           // Contains the value, or the section offset address when the value is an address in a section, and the size (if any)
    uint32_t        m_flags;                // A copy of the flags from the original symbol table, the ObjectFile plug-in can interpret these
};

} // namespace lldb_private

#endif // liblldb_Symbol_h_
