264 lines
7.3 KiB
C++
264 lines
7.3 KiB
C++
// gdb-index.h -- generate .gdb_index section for fast debug lookup -*- C++ -*-
|
|
|
|
// Copyright (C) 2012-2016 Free Software Foundation, Inc.
|
|
// Written by Cary Coutant <ccoutant@google.com>.
|
|
|
|
// This file is part of gold.
|
|
|
|
// 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, write to the Free Software
|
|
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
|
// MA 02110-1301, USA.
|
|
|
|
#include <sys/types.h>
|
|
#include <vector>
|
|
|
|
#include "gold.h"
|
|
#include "output.h"
|
|
#include "mapfile.h"
|
|
#include "stringpool.h"
|
|
|
|
#ifndef GOLD_GDB_INDEX_H
|
|
#define GOLD_GDB_INDEX_H
|
|
|
|
namespace gold
|
|
{
|
|
|
|
class Output_section;
|
|
class Output_file;
|
|
class Mapfile;
|
|
template<int size, bool big_endian>
|
|
class Sized_relobj;
|
|
class Dwarf_range_list;
|
|
template <typename T>
|
|
class Gdb_hashtab;
|
|
class Gdb_index_info_reader;
|
|
class Dwarf_pubnames_table;
|
|
|
|
// This class manages the .gdb_index section, which is a fast
|
|
// lookup table for DWARF information used by the gdb debugger.
|
|
// The format of this section is described in gdb/doc/gdb.texinfo.
|
|
|
|
class Gdb_index : public Output_section_data
|
|
{
|
|
public:
|
|
Gdb_index(Output_section* gdb_index_section);
|
|
|
|
~Gdb_index();
|
|
|
|
// Scan a .debug_info or .debug_types input section.
|
|
void scan_debug_info(bool is_type_unit,
|
|
Relobj* object,
|
|
const unsigned char* symbols,
|
|
off_t symbols_size,
|
|
unsigned int shndx,
|
|
unsigned int reloc_shndx,
|
|
unsigned int reloc_type);
|
|
|
|
// Add a compilation unit.
|
|
int
|
|
add_comp_unit(off_t cu_offset, off_t cu_length)
|
|
{
|
|
this->comp_units_.push_back(Comp_unit(cu_offset, cu_length));
|
|
return this->comp_units_.size() - 1;
|
|
}
|
|
|
|
// Add a type unit.
|
|
int
|
|
add_type_unit(off_t tu_offset, off_t type_offset, uint64_t signature)
|
|
{
|
|
this->type_units_.push_back(Type_unit(tu_offset, type_offset, signature));
|
|
return this->type_units_.size() - 1;
|
|
}
|
|
|
|
// Add an address range.
|
|
void
|
|
add_address_range_list(Relobj* object, unsigned int cu_index,
|
|
Dwarf_range_list* ranges)
|
|
{
|
|
this->ranges_.push_back(Per_cu_range_list(object, cu_index, ranges));
|
|
}
|
|
|
|
// Add a symbol. FLAGS are the gdb_index version 7 flags to be stored in
|
|
// the high-byte of the cu_index field.
|
|
void
|
|
add_symbol(int cu_index, const char* sym_name, uint8_t flags);
|
|
|
|
// Return the offset into the pubnames table for the cu at the given
|
|
// offset.
|
|
off_t
|
|
find_pubname_offset(off_t cu_offset);
|
|
|
|
// Return the offset into the pubtypes table for the cu at the
|
|
// given offset.
|
|
off_t
|
|
find_pubtype_offset(off_t cu_offset);
|
|
|
|
// Return TRUE if we have already processed the pubnames and types
|
|
// set for OBJECT of the CUs and TUS associated with the statement
|
|
// list at OFFSET.
|
|
bool
|
|
pubnames_read(const Relobj* object, off_t offset);
|
|
|
|
// Record that we have already read the pubnames associated with
|
|
// OBJECT and OFFSET.
|
|
void
|
|
set_pubnames_read(const Relobj* object, off_t offset);
|
|
|
|
// Return a pointer to the given table.
|
|
Dwarf_pubnames_table*
|
|
pubnames_table()
|
|
{ return pubnames_table_; }
|
|
|
|
Dwarf_pubnames_table*
|
|
pubtypes_table()
|
|
{ return pubtypes_table_; }
|
|
|
|
// Print usage statistics.
|
|
static void
|
|
print_stats();
|
|
|
|
protected:
|
|
// This is called to update the section size prior to assigning
|
|
// the address and file offset.
|
|
void
|
|
update_data_size()
|
|
{ this->set_final_data_size(); }
|
|
|
|
// Set the final data size.
|
|
void
|
|
set_final_data_size();
|
|
|
|
// Write the data to the file.
|
|
void
|
|
do_write(Output_file*);
|
|
|
|
// Write to a map file.
|
|
void
|
|
do_print_to_mapfile(Mapfile* mapfile) const
|
|
{ mapfile->print_output_data(this, _("** gdb_index")); }
|
|
|
|
// Create a map from dies to pubnames.
|
|
Dwarf_pubnames_table*
|
|
map_pubtable_to_dies(unsigned int attr,
|
|
Gdb_index_info_reader* dwinfo,
|
|
Relobj* object,
|
|
const unsigned char* symbols,
|
|
off_t symbols_size);
|
|
|
|
// Wrapper for map_pubtable_to_dies
|
|
void
|
|
map_pubnames_and_types_to_dies(Gdb_index_info_reader* dwinfo,
|
|
Relobj* object,
|
|
const unsigned char* symbols,
|
|
off_t symbols_size);
|
|
|
|
private:
|
|
// An entry in the compilation unit list.
|
|
struct Comp_unit
|
|
{
|
|
Comp_unit(off_t off, off_t len)
|
|
: cu_offset(off), cu_length(len)
|
|
{ }
|
|
uint64_t cu_offset;
|
|
uint64_t cu_length;
|
|
};
|
|
|
|
// An entry in the type unit list.
|
|
struct Type_unit
|
|
{
|
|
Type_unit(off_t off, off_t toff, uint64_t sig)
|
|
: tu_offset(off), type_offset(toff), type_signature(sig)
|
|
{ }
|
|
uint64_t tu_offset;
|
|
uint64_t type_offset;
|
|
uint64_t type_signature;
|
|
};
|
|
|
|
// An entry in the address range list.
|
|
struct Per_cu_range_list
|
|
{
|
|
Per_cu_range_list(Relobj* obj, uint32_t index, Dwarf_range_list* r)
|
|
: object(obj), cu_index(index), ranges(r)
|
|
{ }
|
|
Relobj* object;
|
|
uint32_t cu_index;
|
|
Dwarf_range_list* ranges;
|
|
};
|
|
|
|
// A symbol table entry.
|
|
struct Gdb_symbol
|
|
{
|
|
Stringpool::Key name_key;
|
|
unsigned int hashval;
|
|
unsigned int cu_vector_index;
|
|
|
|
// Return the hash value.
|
|
unsigned int
|
|
hash()
|
|
{ return this->hashval; }
|
|
|
|
// Return true if this symbol is the same as SYMBOL.
|
|
bool
|
|
equal(Gdb_symbol* symbol)
|
|
{ return this->name_key == symbol->name_key; }
|
|
};
|
|
|
|
typedef std::vector<std::pair<int, uint8_t> > Cu_vector;
|
|
|
|
typedef Unordered_map<off_t, off_t> Pubname_offset_map;
|
|
Pubname_offset_map cu_pubname_map_;
|
|
Pubname_offset_map cu_pubtype_map_;
|
|
|
|
// Scan the given pubtable and build a map of the various dies it
|
|
// refers to, so we can process the entries when we encounter the
|
|
// die.
|
|
void
|
|
map_pubtable_to_dies(Dwarf_pubnames_table* table,
|
|
Pubname_offset_map* map);
|
|
|
|
// Tables to store the pubnames section of the current object.
|
|
Dwarf_pubnames_table* pubnames_table_;
|
|
Dwarf_pubnames_table* pubtypes_table_;
|
|
|
|
// The .gdb_index section.
|
|
Output_section* gdb_index_section_;
|
|
// The list of DWARF compilation units.
|
|
std::vector<Comp_unit> comp_units_;
|
|
// The list of DWARF type units.
|
|
std::vector<Type_unit> type_units_;
|
|
// The list of address ranges.
|
|
std::vector<Per_cu_range_list> ranges_;
|
|
// The symbol table.
|
|
Gdb_hashtab<Gdb_symbol>* gdb_symtab_;
|
|
// The CU vector portion of the constant pool.
|
|
std::vector<Cu_vector*> cu_vector_list_;
|
|
// An array to map from a CU vector index to an offset to the constant pool.
|
|
off_t* cu_vector_offsets_;
|
|
// The string portion of the constant pool.
|
|
Stringpool stringpool_;
|
|
// Offsets of the various pieces of the .gdb_index section.
|
|
off_t tu_offset_;
|
|
off_t addr_offset_;
|
|
off_t symtab_offset_;
|
|
off_t cu_pool_offset_;
|
|
off_t stringpool_offset_;
|
|
// Object, stmt list offset of the CUs and TUs associated with the
|
|
// last read pubnames and pubtypes sections.
|
|
const Relobj* pubnames_object_;
|
|
off_t stmt_list_offset_;
|
|
};
|
|
|
|
} // End namespace gold.
|
|
|
|
#endif // !defined(GOLD_GDB_INDEX_H)
|