/* Definitions for symbol file management in GDB.
- Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
- 2002, 2003, 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 1992-2013 Free Software Foundation, Inc.
This file is part of GDB.
#define OBJFILES_H
#include "gdb_obstack.h" /* For obstack internals. */
-#include "symfile.h" /* For struct psymbol_allocation_list */
+#include "symfile.h" /* For struct psymbol_allocation_list. */
#include "progspace.h"
+#include "registry.h"
+#include "gdb_bfd.h"
struct bcache;
struct htab;
the debugging information, where these values are the starting
address (inclusive) and ending address (exclusive) of the
instruction space in the executable which correspond to the
- "startup file", I.E. crt0.o in most cases. This file is assumed to
+ "startup file", i.e. crt0.o in most cases. This file is assumed to
be a startup file and frames with pc's inside it are treated as
nonexistent. Setting these variables is necessary so that
backtraces do not fly off the bottom of the stack.
NOTE: cagney/2003-09-09: It turns out that this "traditional"
method doesn't work. Corinna writes: ``It turns out that the call
to test for "inside entry file" destroys a meaningful backtrace
- under some conditions. E. g. the backtrace tests in the asm-source
+ under some conditions. E.g. the backtrace tests in the asm-source
testcase are broken for some targets. In this test the functions
are all implemented as part of one file and the testcase is not
necessarily linked with a start file (depending on the target).
/* Objfile this section is part of. */
struct objfile *objfile;
- /* True if this "overlay section" is mapped into an "overlay region". */
+ /* True if this "overlay section" is mapped into an "overlay region". */
int ovly_mapped;
};
/* Relocation offset applied to S. */
#define obj_section_offset(s) \
- (((s)->objfile->section_offsets)->offsets[(s)->the_bfd_section->index])
+ (((s)->objfile->section_offsets)->offsets[gdb_bfd_section_index ((s)->objfile->obfd, (s)->the_bfd_section)])
/* The memory address of section S (vma + offset). */
#define obj_section_addr(s) \
- (bfd_get_section_vma ((s)->objfile->abfd, s->the_bfd_section) \
+ (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section) \
+ obj_section_offset (s))
/* The one-passed-the-end memory address of section S
(vma + size + offset). */
#define obj_section_endaddr(s) \
- (bfd_get_section_vma ((s)->objfile->abfd, s->the_bfd_section) \
+ (bfd_get_section_vma ((s)->objfile->obfd, s->the_bfd_section) \
+ bfd_get_section_size ((s)->the_bfd_section) \
+ obj_section_offset (s))
/* The "objstats" structure provides a place for gdb to record some
interesting information about its internal state at runtime, on a
per objfile basis, such as information about the number of symbols
- read, size of string table (if any), etc. */
+ read, size of string table (if any), etc. */
struct objstats
{
/* Number of entries in the minimal symbol hash table. */
#define MINIMAL_SYMBOL_HASH_SIZE 2039
+/* Some objfile data is hung off the BFD. This enables sharing of the
+ data across all objfiles using the BFD. The data is stored in an
+ instance of this structure, and associated with the BFD using the
+ registry system. */
+
+struct objfile_per_bfd_storage
+{
+ /* The storage has an obstack of its own. */
+
+ struct obstack storage_obstack;
+
+ /* Byte cache for file names. */
+
+ struct bcache *filename_cache;
+
+ /* Byte cache for macros. */
+ struct bcache *macro_cache;
+};
+
/* Master structure for keeping track of each file from which
gdb reads symbols. There are several ways these get allocated: 1.
The main symbol file, symfile_objfile, set by the symbol-file command,
{
/* All struct objfile's are chained together by their next pointers.
- The global variable "object_files" points to the first link in this
- chain.
-
- FIXME: There is a problem here if the objfile is reusable, and if
- multiple users are to be supported. The problem is that the objfile
- list is linked through a member of the objfile struct itself, which
- is only valid for one gdb process. The list implementation needs to
- be changed to something like:
-
- struct list {struct list *next; struct objfile *objfile};
-
- where the list structure is completely maintained separately within
- each gdb process. */
+ The program space field "objfiles" (frequently referenced via
+ the macro "object_files") points to the first link in this
+ chain. */
struct objfile *next;
- /* The object file's name, tilde-expanded and absolute. Malloc'd; free it
- if you free this struct. This pointer is never NULL. */
+ /* The object file's name, tilde-expanded and absolute. This
+ pointer is never NULL. This does not have to be freed; it is
+ guaranteed to have a lifetime at least as long as the objfile. */
char *name;
- /* Some flag bits for this objfile. */
+ CORE_ADDR addr_low;
+
+ /* Some flag bits for this objfile.
+ The values are defined by OBJF_*. */
unsigned short flags;
/* Each objfile points to a linked list of symtabs derived from this file,
one symtab structure for each compilation unit (source file). Each link
- in the symtab list contains a backpointer to this objfile. */
+ in the symtab list contains a backpointer to this objfile. */
struct symtab *symtabs;
/* Each objfile points to a linked list of partial symtabs derived from
this file, one partial symtab structure for each compilation unit
- (source file). */
+ (source file). */
struct partial_symtab *psymtabs;
struct addrmap *psymtabs_addrmap;
- /* List of freed partial symtabs, available for re-use */
+ /* List of freed partial symtabs, available for re-use. */
struct partial_symtab *free_psymtabs;
bfd *obfd;
+ /* The per-BFD data. Note that this is treated specially if OBFD
+ is NULL. */
+
+ struct objfile_per_bfd_storage *per_bfd;
+
/* The gdbarch associated with the BFD. Note that this gdbarch is
determined solely from BFD information, without looking at target
information. The gdbarch determined from a running target may
long mtime;
/* Obstack to hold objects that should be freed when we load a new symbol
- table from this object file. */
+ table from this object file. */
struct obstack objfile_obstack;
/* A byte cache where we can stash arbitrary "chunks" of bytes that
- will not change. */
+ will not change. */
- struct psymbol_bcache *psymbol_cache; /* Byte cache for partial syms */
- struct bcache *macro_cache; /* Byte cache for macros */
- struct bcache *filename_cache; /* Byte cache for file names. */
+ struct psymbol_bcache *psymbol_cache; /* Byte cache for partial syms. */
/* Hash table for mapping symbol names to demangled names. Each
entry in the hash table is actually two consecutive strings,
struct htab *demangled_names_hash;
/* Vectors of all partial symbols read in from file. The actual data
- is stored in the objfile_obstack. */
+ is stored in the objfile_obstack. */
struct psymbol_allocation_list global_psymbols;
struct psymbol_allocation_list static_psymbols;
/* Each file contains a pointer to an array of minimal symbols for all
- global symbols that are defined within the file. The array is terminated
- by a "null symbol", one that has a NULL pointer for the name and a zero
- value for the address. This makes it easy to walk through the array
- when passed a pointer to somewhere in the middle of it. There is also
- a count of the number of symbols, which does not include the terminating
- null symbol. The array itself, as well as all the data that it points
- to, should be allocated on the objfile_obstack for this file. */
+ global symbols that are defined within the file. The array is
+ terminated by a "null symbol", one that has a NULL pointer for the
+ name and a zero value for the address. This makes it easy to walk
+ through the array when passed a pointer to somewhere in the middle
+ of it. There is also a count of the number of symbols, which does
+ not include the terminating null symbol. The array itself, as well
+ as all the data that it points to, should be allocated on the
+ objfile_obstack for this file. */
struct minimal_symbol *msymbols;
int minimal_symbol_count;
struct minimal_symbol *msymbol_demangled_hash[MINIMAL_SYMBOL_HASH_SIZE];
/* Structure which keeps track of functions that manipulate objfile's
- of the same type as this objfile. I.E. the function to read partial
+ of the same type as this objfile. I.e. the function to read partial
symbols for example. Note that this structure is in statically
allocated memory, and is shared by all objfiles that use the
- object module reader of this type. */
+ object module reader of this type. */
const struct sym_fns *sf;
/* The per-objfile information about the entry point, the scope (file/func)
- containing the entry point, and the scope of the user's main() func. */
+ containing the entry point, and the scope of the user's main() func. */
struct entry_info ei;
- /* Information about stabs. Will be filled in with a dbx_symfile_info
- struct by those readers that need it. */
- /* NOTE: cagney/2004-10-23: This has been replaced by per-objfile
- data points implemented using "data" and "num_data" below. For
- an example of how to use this replacement, see "objfile_data"
- in "mips-tdep.c". */
-
- struct dbx_symfile_info *deprecated_sym_stab_info;
-
- /* Hook for information for use by the symbol reader (currently used
- for information shared by sym_init and sym_read). It is
- typically a pointer to malloc'd memory. The symbol reader's finish
- function is responsible for freeing the memory thusly allocated. */
- /* NOTE: cagney/2004-10-23: This has been replaced by per-objfile
- data points implemented using "data" and "num_data" below. For
- an example of how to use this replacement, see "objfile_data"
- in "mips-tdep.c". */
-
- void *deprecated_sym_private;
-
/* Per objfile data-pointers required by other GDB modules. */
- /* FIXME: kettenis/20030711: This mechanism could replace
- deprecated_sym_stab_info and deprecated_sym_private
- entirely. */
- void **data;
- unsigned num_data;
+ REGISTRY_FIELDS;
/* Set of relocation offsets to apply to each section.
- Currently on the objfile_obstack (which makes no sense, but I'm
- not sure it's harming anything).
+ The table is indexed by the_bfd_section->index, thus it is generally
+ as large as the number of sections in the binary.
+ The table is stored on the objfile_obstack.
These offsets indicate that all symbols (including partial and
minimal symbols) which have been read have been relocated by this
- much. Symbols which are yet to be read need to be relocated by
- it. */
+ much. Symbols which are yet to be read need to be relocated by it. */
struct section_offsets *section_offsets;
int num_sections;
- /* Indexes in the section_offsets array. These are initialized by the
+ /* Indexes in the section_offsets array. These are initialized by the
*_symfile_offsets() family of functions (som_symfile_offsets,
- xcoff_symfile_offsets, default_symfile_offsets). In theory they
+ xcoff_symfile_offsets, default_symfile_offsets). In theory they
should correspond to the section indexes used by bfd for the
- current objfile. The exception to this for the time being is the
- SOM version. */
+ current objfile. The exception to this for the time being is the
+ SOM version. */
int sect_index_text;
int sect_index_data;
among other things, is used to map pc addresses into sections.
SECTIONS points to the first entry in the table, and
SECTIONS_END points to the first location past the last entry
- in the table. Currently the table is stored on the
- objfile_obstack (which makes no sense, but I'm not sure it's
- harming anything). */
+ in the table. The table is stored on the objfile_obstack. The
+ sections are indexed by the BFD section index; but the
+ structure data is only valid for certain sections
+ (e.g. non-empty, SEC_ALLOC). */
- struct obj_section
- *sections, *sections_end;
+ struct obj_section *sections, *sections_end;
/* GDB allows to have debug symbols in separate object files. This is
used by .gnu_debuglink, ELF build id note and Mach-O OSO.
struct objfile *separate_debug_objfile;
/* If this is a separate debug object, this is used as a link to the
- actual executable objfile. */
+ actual executable objfile. */
struct objfile *separate_debug_objfile_backlink;
/* If this is a separate debug object, this is a link to the next one
for the same executable objfile. */
struct objfile *separate_debug_objfile_link;
- /* Place to stash various statistics about this objfile */
- OBJSTATS;
-
- /* A symtab that the C++ code uses to stash special symbols
- associated to namespaces. */
-
- /* FIXME/carlton-2003-06-27: Delete this in a few years once
- "possible namespace symbols" go away. */
- struct symtab *cp_namespace_symtab;
+ /* Place to stash various statistics about this objfile. */
+ OBJSTATS;
/* A linked list of symbols created when reading template types or
function templates. These symbols are not stored in any symbol
struct symbol *template_symbols;
};
-/* Defines for the objfile flag word. */
+/* Defines for the objfile flag word. */
/* When an object file has its functions reordered (currently Irix-5.2
shared libraries exhibit this behaviour), we will need an expensive
#define OBJF_REORDERED (1 << 0) /* Functions are reordered */
/* Distinguish between an objfile for a shared library and a "vanilla"
- objfile. (If not set, the objfile may still actually be a solib.
+ objfile. (If not set, the objfile may still actually be a solib.
This can happen if the user created the objfile by using the
add-symbol-file command. GDB doesn't in that situation actually
check whether the file is a solib. Rather, the target's
#define OBJF_SHARED (1 << 1) /* From a shared library */
-/* User requested that this objfile be read in it's entirety. */
+/* User requested that this objfile be read in it's entirety. */
#define OBJF_READNOW (1 << 2) /* Immediate full read */
for run_command to remove old objfile entries which are no longer
valid (i.e., are associated with an old inferior), but to preserve
ones that the user explicitly loaded via the add-symbol-file
- command. */
+ command. */
#define OBJF_USERLOADED (1 << 3) /* User loaded */
+/* Set if we have tried to read partial symtabs for this objfile.
+ This is used to allow lazy reading of partial symtabs. */
+
+#define OBJF_PSYMTABS_READ (1 << 4)
+
+/* Set if this is the main symbol file
+ (as opposed to symbol file for dynamically loaded code). */
+
+#define OBJF_MAINLINE (1 << 5)
+
/* The object file that contains the runtime common minimal symbols
- for SunOS4. Note that this objfile has no associated BFD. */
+ for SunOS4. Note that this objfile has no associated BFD. */
extern struct objfile *rt_common_objfile;
-/* When we need to allocate a new type, we need to know which objfile_obstack
- to allocate the type on, since there is one for each objfile. The places
- where types are allocated are deeply buried in function call hierarchies
- which know nothing about objfiles, so rather than trying to pass a
- particular objfile down to them, we just do an end run around them and
- set current_objfile to be whatever objfile we expect to be using at the
- time types are being allocated. For instance, when we start reading
- symbols for a particular objfile, we set current_objfile to point to that
- objfile, and when we are done, we set it back to NULL, to ensure that we
- never put a type someplace other than where we are expecting to put it.
- FIXME: Maybe we should review the entire type handling system and
- see if there is a better way to avoid this problem. */
-
-extern struct objfile *current_objfile;
-
/* Declarations for functions defined in objfiles.c */
extern struct objfile *allocate_objfile (bfd *, int);
extern struct gdbarch *get_objfile_arch (struct objfile *);
-extern void init_entry_point_info (struct objfile *);
-
extern int entry_point_address_query (CORE_ADDR *entry_p);
extern CORE_ADDR entry_point_address (void);
-extern int build_objfile_section_table (struct objfile *);
+extern void build_objfile_section_table (struct objfile *);
extern void terminate_minimal_symbol_table (struct objfile *objfile);
extern void free_all_objfiles (void);
-extern void objfile_relocate (struct objfile *, struct section_offsets *);
+extern void objfile_relocate (struct objfile *, const struct section_offsets *);
+extern void objfile_rebase (struct objfile *, CORE_ADDR);
extern int objfile_has_partial_symbols (struct objfile *objfile);
/* This operation deletes all objfile entries that represent solibs that
weren't explicitly loaded by the user, via e.g., the add-symbol-file
- command.
- */
+ command. */
+
extern void objfile_purge_solibs (void);
/* Functions for dealing with the minimal symbol table, really a misc
extern struct obj_section *find_pc_section (CORE_ADDR pc);
-extern int in_plt_section (CORE_ADDR, char *);
+/* Return non-zero if PC is in a section called NAME. */
+extern int pc_in_section (CORE_ADDR, char *);
+
+/* Return non-zero if PC is in a SVR4-style procedure linkage table
+ section. */
+
+static inline int
+in_plt_section (CORE_ADDR pc)
+{
+ return pc_in_section (pc, ".plt");
+}
/* Keep a registry of per-objfile data-pointers required by other GDB
modules. */
-
-/* Allocate an entry in the per-objfile registry. */
-extern const struct objfile_data *register_objfile_data (void);
-
-/* Allocate an entry in the per-objfile registry.
- SAVE and FREE are called when clearing objfile data.
- First all registered SAVE functions are called.
- Then all registered FREE functions are called.
- Either or both of SAVE, FREE may be NULL. */
-extern const struct objfile_data *register_objfile_data_with_cleanup
- (void (*save) (struct objfile *, void *),
- void (*free) (struct objfile *, void *));
-
-extern void clear_objfile_data (struct objfile *objfile);
-extern void set_objfile_data (struct objfile *objfile,
- const struct objfile_data *data, void *value);
-extern void *objfile_data (struct objfile *objfile,
- const struct objfile_data *data);
-
-extern struct bfd *gdb_bfd_ref (struct bfd *abfd);
-extern void gdb_bfd_unref (struct bfd *abfd);
-extern int gdb_bfd_close_or_warn (struct bfd *abfd);
+DECLARE_REGISTRY(objfile);
+
+/* In normal use, the section map will be rebuilt by find_pc_section
+ if objfiles have been added, removed or relocated since it was last
+ called. Calling inhibit_section_map_updates will inhibit this
+ behavior until resume_section_map_updates is called. If you call
+ inhibit_section_map_updates you must ensure that every call to
+ find_pc_section in the inhibited region relates to a section that
+ is already in the section map and has not since been removed or
+ relocated. */
+extern void inhibit_section_map_updates (struct program_space *pspace);
+
+/* Resume automatically rebuilding the section map as required. */
+extern void resume_section_map_updates (struct program_space *pspace);
+
+/* Version of the above suitable for use as a cleanup. */
+extern void resume_section_map_updates_cleanup (void *arg);
+
+extern void default_iterate_over_objfiles_in_search_order
+ (struct gdbarch *gdbarch,
+ iterate_over_objfiles_in_search_order_cb_ftype *cb,
+ void *cb_data, struct objfile *current_objfile);
\f
/* Traverse all object files in the current program space.
/* Traverse all object files in program space SS. */
#define ALL_PSPACE_OBJFILES(ss, obj) \
- for ((obj) = ss->objfiles; (obj) != NULL; (obj) = (obj)->next) \
+ for ((obj) = ss->objfiles; (obj) != NULL; (obj) = (obj)->next)
#define ALL_PSPACE_OBJFILES_SAFE(ss, obj, nxt) \
for ((obj) = ss->objfiles; \
#define ALL_OBJFILE_SYMTABS(objfile, s) \
for ((s) = (objfile) -> symtabs; (s) != NULL; (s) = (s) -> next)
+/* Traverse all primary symtabs in one objfile. */
+
+#define ALL_OBJFILE_PRIMARY_SYMTABS(objfile, s) \
+ ALL_OBJFILE_SYMTABS ((objfile), (s)) \
+ if ((s)->primary)
+
/* Traverse all minimal symbols in one objfile. */
#define ALL_OBJFILE_MSYMBOLS(objfile, m) \
#define ALL_PRIMARY_SYMTABS(objfile, s) \
ALL_OBJFILES (objfile) \
- ALL_OBJFILE_SYMTABS (objfile, s) \
- if ((s)->primary)
+ ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
#define ALL_PSPACE_PRIMARY_SYMTABS(pspace, objfile, s) \
ALL_PSPACE_OBJFILES (ss, objfile) \
- ALL_OBJFILE_SYMTABS (objfile, s) \
- if ((s)->primary)
+ ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
/* Traverse all minimal symbols in all objfiles in the current symbol
space. */
ALL_OBJFILE_MSYMBOLS (objfile, m)
#define ALL_OBJFILE_OSECTIONS(objfile, osect) \
- for (osect = objfile->sections; osect < objfile->sections_end; osect++)
+ for (osect = objfile->sections; osect < objfile->sections_end; osect++) \
+ if (osect->the_bfd_section == NULL) \
+ { \
+ /* Nothing. */ \
+ } \
+ else
/* Traverse all obj_sections in all objfiles in the current program
space.
loop's loop expression, advance OBJFILE, but iff the inner loop
reached its end. If not, there was a "break;", so leave OBJFILE
as is; the outer loop's conditional will break immediately as
- well (as OSECT will be different from OBJFILE->sections_end).
-*/
+ well (as OSECT will be different from OBJFILE->sections_end). */
#define ALL_OBJSECTIONS(objfile, osect) \
for ((objfile) = current_program_space->objfiles, \
? ((objfile) = (objfile)->next, \
(objfile) != NULL ? (osect) = (objfile)->sections_end : 0) \
: 0)) \
- for ((osect) = (objfile)->sections; \
- (osect) < (objfile)->sections_end; \
- (osect)++)
+ ALL_OBJFILE_OSECTIONS (objfile, osect)
#define SECT_OFF_DATA(objfile) \
((objfile->sect_index_data == -1) \
- ? (internal_error (__FILE__, __LINE__, _("sect_index_data not initialized")), -1) \
+ ? (internal_error (__FILE__, __LINE__, \
+ _("sect_index_data not initialized")), -1) \
: objfile->sect_index_data)
#define SECT_OFF_RODATA(objfile) \
((objfile->sect_index_rodata == -1) \
- ? (internal_error (__FILE__, __LINE__, _("sect_index_rodata not initialized")), -1) \
+ ? (internal_error (__FILE__, __LINE__, \
+ _("sect_index_rodata not initialized")), -1) \
: objfile->sect_index_rodata)
#define SECT_OFF_TEXT(objfile) \
((objfile->sect_index_text == -1) \
- ? (internal_error (__FILE__, __LINE__, _("sect_index_text not initialized")), -1) \
+ ? (internal_error (__FILE__, __LINE__, \
+ _("sect_index_text not initialized")), -1) \
: objfile->sect_index_text)
/* Sometimes the .bss section is missing from the objfile, so we don't
- want to die here. Let the users of SECT_OFF_BSS deal with an
- uninitialized section index. */
+ want to die here. Let the users of SECT_OFF_BSS deal with an
+ uninitialized section index. */
#define SECT_OFF_BSS(objfile) (objfile)->sect_index_bss
/* Answer whether there is more than one object file loaded. */
#define MULTI_OBJFILE_P() (object_files && object_files->next)
+/* Reset the per-BFD storage area on OBJ. */
+
+void set_objfile_per_bfd (struct objfile *obj);
+
#endif /* !defined (OBJFILES_H) */
projects / deliverable / binutils-gdb.git / blobdiff