2273f0ac95
This removes the runtime offsets from minsyms. Instead, these offsets will now be applied whenever the minsym's address is computed. This patch redefines MSYMBOL_VALUE_ADDRESS to actually use the offsets from the given objfile. Then, it updates all the symbol readers, changing them so that they do not add in the section offset when creating the symbol. This change also lets us remove relocation of minsyms from objfile_relocate1 and also msymbols_sort. 2014-02-26 Tom Tromey <tromey@redhat.com> * minsyms.c (msymbols_sort): Remove. * minsyms.h (msymbols_sort): Remove. * objfiles.c (objfile_relocate1): Don't relocate minsyms. * symtab.h (MSYMBOL_VALUE_ADDRESS): Use objfile offsets. * elfread.c (elf_symtab_read): Don't add section offsets. * xcoffread.c (record_minimal_symbol): Don't add section offset to minimal symbol address. * somread.c (text_offset, data_offset): Remove. (som_symtab_read): Don't add section offsets to minimal symbol addresses. * coff-pe-read.c (add_pe_forwarded_sym, read_pe_exported_syms): Don't add section offsets to minimal symbols. * coffread.c (coff_symtab_read): Don't add section offsets to minimal symbol addresses. * machoread.c (macho_symtab_add_minsym): Don't add section offset to minimal symbol addresses. * mipsread.c (read_alphacoff_dynamic_symtab): Don't add section offset to minimal symbol addresses. * mdebugread.c (parse_partial_symbols): Don't add section offset to minimal symbol addresses. * dbxread.c (read_dbx_dynamic_symtab): Don't add section offset to minimal symbol addresses.
255 lines
9.2 KiB
C
255 lines
9.2 KiB
C
/* Minimal symbol table definitions for GDB.
|
||
|
||
Copyright (C) 2011-2014 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 MINSYMS_H
|
||
#define MINSYMS_H
|
||
|
||
/* Several lookup functions return both a minimal symbol and the
|
||
objfile in which it is found. This structure is used in these
|
||
cases. */
|
||
|
||
struct bound_minimal_symbol
|
||
{
|
||
/* The minimal symbol that was found, or NULL if no minimal symbol
|
||
was found. */
|
||
|
||
struct minimal_symbol *minsym;
|
||
|
||
/* If MINSYM is not NULL, then this is the objfile in which the
|
||
symbol is defined. */
|
||
|
||
struct objfile *objfile;
|
||
};
|
||
|
||
/* This header declares most of the API for dealing with minimal
|
||
symbols and minimal symbol tables. A few things are declared
|
||
elsewhere; see below.
|
||
|
||
A minimal symbol is a symbol for which there is no direct debug
|
||
information. For example, for an ELF binary, minimal symbols are
|
||
created from the ELF symbol table.
|
||
|
||
For the definition of the minimal symbol structure, see struct
|
||
minimal_symbol in symtab.h.
|
||
|
||
Minimal symbols are stored in tables attached to an objfile; see
|
||
objfiles.h for details. Code should generally treat these tables
|
||
as opaque and use functions provided by minsyms.c to inspect them.
|
||
*/
|
||
|
||
/* Prepare to start collecting minimal symbols. This should be called
|
||
by a symbol reader to initialize the minimal symbol module.
|
||
Currently, minimal symbol table creation is not reentrant; it
|
||
relies on global (static) variables in minsyms.c. */
|
||
|
||
void init_minimal_symbol_collection (void);
|
||
|
||
/* Return a cleanup which is used to clean up the global state left
|
||
over by minimal symbol creation. After calling
|
||
init_minimal_symbol_collection, a symbol reader should call this
|
||
function. Then, after all minimal symbols have been read,
|
||
regardless of whether they are installed or not, the cleanup
|
||
returned by this function should be run. */
|
||
|
||
struct cleanup *make_cleanup_discard_minimal_symbols (void);
|
||
|
||
/* Record a new minimal symbol. This is the "full" entry point;
|
||
simpler convenience entry points are also provided below.
|
||
|
||
This returns a new minimal symbol. It is ok to modify the returned
|
||
minimal symbol (though generally not necessary). It is not ok,
|
||
though, to stash the pointer anywhere; as minimal symbols may be
|
||
moved after creation. The memory for the returned minimal symbol
|
||
is still owned by the minsyms.c code, and should not be freed.
|
||
|
||
Arguments are:
|
||
|
||
NAME - the symbol's name
|
||
NAME_LEN - the length of the name
|
||
COPY_NAME - if true, the minsym code must make a copy of NAME. If
|
||
false, then NAME must be NUL-terminated, and must have a lifetime
|
||
that is at least as long as OBJFILE's lifetime.
|
||
ADDRESS - the address of the symbol
|
||
MS_TYPE - the type of the symbol
|
||
SECTION - the symbol's section
|
||
appropriate obj_section for the minimal symbol. This can be NULL.
|
||
OBJFILE - the objfile associated with the minimal symbol. */
|
||
|
||
struct minimal_symbol *prim_record_minimal_symbol_full
|
||
(const char *name,
|
||
int name_len,
|
||
int copy_name,
|
||
CORE_ADDR address,
|
||
enum minimal_symbol_type ms_type,
|
||
int section,
|
||
struct objfile *objfile);
|
||
|
||
/* Like prim_record_minimal_symbol_full, but:
|
||
- uses strlen to compute NAME_LEN,
|
||
- passes COPY_NAME = 0,
|
||
- and passes a default SECTION, depending on the type
|
||
|
||
This variant does not return the new symbol. */
|
||
|
||
void prim_record_minimal_symbol (const char *, CORE_ADDR,
|
||
enum minimal_symbol_type,
|
||
struct objfile *);
|
||
|
||
/* Like prim_record_minimal_symbol_full, but:
|
||
- uses strlen to compute NAME_LEN,
|
||
- passes COPY_NAME = 0. */
|
||
|
||
struct minimal_symbol *prim_record_minimal_symbol_and_info
|
||
(const char *,
|
||
CORE_ADDR,
|
||
enum minimal_symbol_type,
|
||
int section,
|
||
struct objfile *);
|
||
|
||
/* Install the minimal symbols that have been collected into the given
|
||
objfile. After this is called, the cleanup returned by
|
||
make_cleanup_discard_minimal_symbols should be run in order to
|
||
clean up global state. */
|
||
|
||
void install_minimal_symbols (struct objfile *);
|
||
|
||
/* Create the terminating entry of OBJFILE's minimal symbol table.
|
||
If OBJFILE->msymbols is zero, allocate a single entry from
|
||
OBJFILE->objfile_obstack; otherwise, just initialize
|
||
OBJFILE->msymbols[OBJFILE->minimal_symbol_count]. */
|
||
|
||
void terminate_minimal_symbol_table (struct objfile *objfile);
|
||
|
||
|
||
|
||
/* Compute a hash code for the string argument. */
|
||
|
||
unsigned int msymbol_hash (const char *);
|
||
|
||
/* Like msymbol_hash, but compute a hash code that is compatible with
|
||
strcmp_iw. */
|
||
|
||
unsigned int msymbol_hash_iw (const char *);
|
||
|
||
/* Compute the next hash value from previous HASH and the character C. This
|
||
is only a GDB in-memory computed value with no external files compatibility
|
||
requirements. */
|
||
|
||
#define SYMBOL_HASH_NEXT(hash, c) \
|
||
((hash) * 67 + tolower ((unsigned char) (c)) - 113)
|
||
|
||
|
||
|
||
/* Look through all the current minimal symbol tables and find the
|
||
first minimal symbol that matches NAME. If OBJF is non-NULL, limit
|
||
the search to that objfile. If SFILE is non-NULL, the only
|
||
file-scope symbols considered will be from that source file (global
|
||
symbols are still preferred). Returns a bound minimal symbol that
|
||
matches, or an empty bound minimal symbol if no match is found. */
|
||
|
||
struct bound_minimal_symbol lookup_minimal_symbol (const char *,
|
||
const char *,
|
||
struct objfile *);
|
||
|
||
/* Like lookup_minimal_symbol, but searches all files and
|
||
objfiles. */
|
||
|
||
struct bound_minimal_symbol lookup_bound_minimal_symbol (const char *);
|
||
|
||
/* Find the minimal symbol named NAME, and return both the minsym
|
||
struct and its objfile. This only checks the linkage name. */
|
||
|
||
struct bound_minimal_symbol lookup_minimal_symbol_and_objfile (const char *);
|
||
|
||
/* Look through all the current minimal symbol tables and find the
|
||
first minimal symbol that matches NAME and has text type. If OBJF
|
||
is non-NULL, limit the search to that objfile. Returns a bound
|
||
minimal symbol that matches, or an "empty" bound minimal symbol
|
||
otherwise.
|
||
|
||
This function only searches the mangled (linkage) names. */
|
||
|
||
struct bound_minimal_symbol lookup_minimal_symbol_text (const char *,
|
||
struct objfile *);
|
||
|
||
/* Look through all the current minimal symbol tables and find the
|
||
first minimal symbol that matches NAME and is a solib trampoline.
|
||
If OBJF is non-NULL, limit the search to that objfile. Returns a
|
||
pointer to the minimal symbol that matches, or NULL if no match is
|
||
found.
|
||
|
||
This function only searches the mangled (linkage) names. */
|
||
|
||
struct bound_minimal_symbol lookup_minimal_symbol_solib_trampoline
|
||
(const char *,
|
||
struct objfile *);
|
||
|
||
/* Look through all the current minimal symbol tables and find the
|
||
first minimal symbol that matches NAME and PC. If OBJF is non-NULL,
|
||
limit the search to that objfile. Returns a pointer to the minimal
|
||
symbol that matches, or NULL if no match is found. */
|
||
|
||
struct minimal_symbol *lookup_minimal_symbol_by_pc_name
|
||
(CORE_ADDR, const char *, struct objfile *);
|
||
|
||
/* Search through the minimal symbol table for each objfile and find
|
||
the symbol whose address is the largest address that is still less
|
||
than or equal to PC, and which matches SECTION.
|
||
|
||
If SECTION is NULL, this uses the result of find_pc_section
|
||
instead.
|
||
|
||
The result has a non-NULL 'minsym' member if such a symbol is
|
||
found, or NULL if PC is not in a suitable range. */
|
||
|
||
struct bound_minimal_symbol lookup_minimal_symbol_by_pc_section
|
||
(CORE_ADDR,
|
||
struct obj_section *);
|
||
|
||
/* Backward compatibility: search through the minimal symbol table
|
||
for a matching PC (no section given).
|
||
|
||
This is a wrapper that calls lookup_minimal_symbol_by_pc_section
|
||
with a NULL section argument. */
|
||
|
||
struct bound_minimal_symbol lookup_minimal_symbol_by_pc (CORE_ADDR);
|
||
|
||
/* Iterate over all the minimal symbols in the objfile OBJF which
|
||
match NAME. Both the ordinary and demangled names of each symbol
|
||
are considered. The caller is responsible for canonicalizing NAME,
|
||
should that need to be done.
|
||
|
||
For each matching symbol, CALLBACK is called with the symbol and
|
||
USER_DATA as arguments. */
|
||
|
||
void iterate_over_minimal_symbols (struct objfile *objf,
|
||
const char *name,
|
||
void (*callback) (struct minimal_symbol *,
|
||
void *),
|
||
void *user_data);
|
||
|
||
/* Compute the upper bound of MINSYM. The upper bound is the last
|
||
address thought to be part of the symbol. If the symbol has a
|
||
size, it is used. Otherwise use the lesser of the next minimal
|
||
symbol in the same section, or the end of the section, as the end
|
||
of the function. */
|
||
|
||
CORE_ADDR minimal_symbol_upper_bound (struct bound_minimal_symbol minsym);
|
||
|
||
#endif /* MINSYMS_H */
|