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old-cross-binutils/gdb/minsyms.h
Tom Tromey 7c7b66552d remove msymbol_objfile 
This is another patch in my ongoing series to "split" objfile to share
more read-only data across inferiors.  See

    http://sourceware.org/gdb/wiki/ObjfileSplitting

When symbols are finally shared, there will be no back-link from the
symbol to its containing objfile, because there may be more than one
such objfile.  So, all such back-links must be removed.

One hidden back-link is the msymbol_objfile function.  Since
(eventually) a symbol may appear in more than one objfile, trying to
look up the objfile given just a symbol cannot work.

This patch removes msymbol_objfile in favor of using a bound minimal
symbol.  It introduces a new function to make this conversion simpler
in some spots.

The bonus of this patch is that using msymbol_objfile is slower than
simply looking up the owning objfile in the first place.

Built and regtested on x86-64 Fedora 18.

	* ada-exp.y (write_var_or_type): Use bound_minimal_symbol.
	* ada-lang.c (ada_lookup_simple_minsym): Return
	bound_minimal_symbol.
	* ada-lang.h (ada_lookup_simple_minsym): Update.
	* c-exp.y (variable): Use lookup_bound_minimal_symbol.
	* f-exp.y (variable): Use lookup_bound_minimal_symbol.
	* go-exp.y (variable): Use lookup_bound_minimal_symbol.
	* jv-exp.y (push_expression_name): Use lookup_bound_minimal_symbol.
	* m2-exp.y (variable): Use lookup_bound_minimal_symbol.
	* minsyms.c (msymbol_objfile): Remove.
	(lookup_minimal_symbol_internal): New function, from
	lookup_minimal_symbol.
	(lookup_minimal_symbol): Rewrite using
	lookup_minimal_symbol_internal.
	(lookup_bound_minimal_symbol): New function.
	* minsyms.h (msymbol_objfile): Remove.
	(lookup_bound_minimal_symbol): Declare.
	* p-exp.y (variable): Use lookup_bound_minimal_symbol.
	* parse.c (write_exp_msymbol): Change parameter to a
	bound_minimal_symbol.
	(write_dollar_variable): Use lookup_bound_minimal_symbol.
	* parser-defs.h (write_exp_msymbol): Update.
	* printcmd.c (address_info): Use lookup_bound_minimal_symbol.
	* symfile.c (simple_read_overlay_table): Use
	lookup_bound_minimal_symbol.
	* symtab.c (skip_prologue_sal): Don't use msymbol_objfile.
	(search_symbols): Likewise.
	(print_msymbol_info): Take a bound_minimal_symbol argument.
	(symtab_symbol_info, rbreak_command): Update.
	* symtab.h (struct symbol_search) <msymbol>: Change type
	to bound_minimal_symbol.
	* valops.c (find_function_in_inferior): Use
	lookup_bound_minimal_symbol.
	* value.c (value_fn_field): Use lookup_bound_minimal_symbol.
2013-08-05 15:51:02 +00:00

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/* Minimal symbol table definitions for GDB.
Copyright (C) 2011-2013 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);
/* Sort all the minimal symbols in OBJFILE. This should be only be
called after relocating symbols; it ensures that the minimal
symbols are properly sorted by address. */
void msymbols_sort (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 pointer to the minimal symbol that
matches, or NULL if no match is found. */
struct minimal_symbol *lookup_minimal_symbol (const char *,
const char *,
struct objfile *);
/* Like lookup_minimal_symbol, but searches all files and objfiles
and returns a bound minimal symbol. */
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 pointer
to the minimal symbol that matches, or NULL if no match is found.
This function only searches the mangled (linkage) names. */
struct 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 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);
#endif /* MINSYMS_H */
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