| /* Public partial symbol table definitions. |
| |
| Copyright (C) 2009-2019 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| 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 PSYMTAB_H |
| #define PSYMTAB_H |
| |
| #include "gdb_obstack.h" |
| #include "symfile.h" |
| #include "common/next-iterator.h" |
| |
| struct partial_symbol; |
| |
| /* A bcache for partial symbols. */ |
| |
| struct psymbol_bcache; |
| |
| /* An instance of this class manages the partial symbol tables and |
| partial symbols for a given objfile. |
| |
| The core psymtab functions -- those in psymtab.c -- arrange for |
| nearly all psymtab- and psymbol-related allocations to happen |
| either in the psymtab_storage object (either on its obstack or in |
| other memory managed by this class), or on the per-BFD object. The |
| only link from the psymtab storage object back to the objfile (or |
| objfile_obstack) that is made by the core psymtab code is the |
| compunit_symtab member in the psymtab. |
| |
| However, it is up to each symbol reader to maintain this invariant |
| in other ways, if it wants to reuse psymtabs across multiple |
| objfiles. The main issue here is ensuring that read_symtab_private |
| does not point into objfile_obstack. */ |
| |
| class psymtab_storage |
| { |
| public: |
| |
| psymtab_storage (); |
| |
| ~psymtab_storage (); |
| |
| DISABLE_COPY_AND_ASSIGN (psymtab_storage); |
| |
| /* Discard all partial symbol tables starting with "psymtabs" and |
| proceeding until "to" has been discarded. */ |
| |
| void discard_psymtabs_to (struct partial_symtab *to) |
| { |
| while (psymtabs != to) |
| discard_psymtab (psymtabs); |
| } |
| |
| /* Discard the partial symbol table. */ |
| |
| void discard_psymtab (struct partial_symtab *pst); |
| |
| /* Return the obstack that is used for storage by this object. */ |
| |
| struct obstack *obstack () |
| { |
| if (!m_obstack.has_value ()) |
| m_obstack.emplace (); |
| return &*m_obstack; |
| } |
| |
| /* Allocate storage for the "dependencies" field of a psymtab. |
| NUMBER says how many dependencies there are. */ |
| |
| struct partial_symtab **allocate_dependencies (int number) |
| { |
| return OBSTACK_CALLOC (obstack (), number, struct partial_symtab *); |
| } |
| |
| /* Allocate a new psymtab on the psymtab obstack. The new psymtab |
| will be linked in to the "psymtabs" list, but otherwise all other |
| fields will be zero. */ |
| |
| struct partial_symtab *allocate_psymtab (); |
| |
| typedef next_adapter<struct partial_symtab> partial_symtab_range; |
| |
| /* A range adapter that makes it possible to iterate over all |
| psymtabs in one objfile. */ |
| |
| partial_symtab_range range () |
| { |
| return partial_symtab_range (psymtabs); |
| } |
| |
| |
| /* Each objfile points to a linked list of partial symtabs derived from |
| this file, one partial symtab structure for each compilation unit |
| (source file). */ |
| |
| struct partial_symtab *psymtabs = nullptr; |
| |
| /* Map addresses to the entries of PSYMTABS. It would be more efficient to |
| have a map per the whole process but ADDRMAP cannot selectively remove |
| its items during FREE_OBJFILE. This mapping is already present even for |
| PARTIAL_SYMTABs which still have no corresponding full SYMTABs read. */ |
| |
| struct addrmap *psymtabs_addrmap = nullptr; |
| |
| /* A byte cache where we can stash arbitrary "chunks" of bytes that |
| will not change. */ |
| |
| struct psymbol_bcache *psymbol_cache; |
| |
| /* Vectors of all partial symbols read in from file. The actual data |
| is stored in the objfile_obstack. */ |
| |
| std::vector<partial_symbol *> global_psymbols; |
| std::vector<partial_symbol *> static_psymbols; |
| |
| private: |
| |
| /* List of freed partial symtabs, available for re-use. */ |
| |
| struct partial_symtab *free_psymtabs = nullptr; |
| |
| /* The obstack where allocations are made. This is lazily allocated |
| so that we don't waste memory when there are no psymtabs. */ |
| |
| gdb::optional<auto_obstack> m_obstack; |
| }; |
| |
| |
| extern struct psymbol_bcache *psymbol_bcache_init (void); |
| extern void psymbol_bcache_free (struct psymbol_bcache *); |
| extern struct bcache *psymbol_bcache_get_bcache (struct psymbol_bcache *); |
| |
| extern const struct quick_symbol_functions psym_functions; |
| |
| extern const struct quick_symbol_functions dwarf2_gdb_index_functions; |
| extern const struct quick_symbol_functions dwarf2_debug_names_functions; |
| |
| /* Ensure that the partial symbols for OBJFILE have been loaded. If |
| VERBOSE is non-zero, then this will print a message when symbols |
| are loaded. This function returns a range adapter suitable for |
| iterating over the psymtabs of OBJFILE. */ |
| |
| extern psymtab_storage::partial_symtab_range require_partial_symbols |
| (struct objfile *objfile, int verbose); |
| |
| #endif /* PSYMTAB_H */ |