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e3c69974ac
* objfiles.h (OBJF_KEEPBFD): Delete. (gdb_bfd_unref): New prototype. * objfiles.c (gdb_bfd_unref): New function. (free_objfile): Call gdb_bfd_unref. * solib.c (free_so): Likewise. (symbol_add_stub): Set refcount.
595 lines
23 KiB
C
595 lines
23 KiB
C
/* Definitions for symbol file management in GDB.
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Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
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2002, 2003, 2004, 2007, 2008, 2009 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (OBJFILES_H)
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#define OBJFILES_H
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#include "gdb_obstack.h" /* For obstack internals. */
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#include "symfile.h" /* For struct psymbol_allocation_list */
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struct bcache;
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struct htab;
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struct symtab;
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struct objfile_data;
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/* This structure maintains information on a per-objfile basis about the
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"entry point" of the objfile, and the scope within which the entry point
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exists. It is possible that gdb will see more than one objfile that is
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executable, each with its own entry point.
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For example, for dynamically linked executables in SVR4, the dynamic linker
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code is contained within the shared C library, which is actually executable
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and is run by the kernel first when an exec is done of a user executable
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that is dynamically linked. The dynamic linker within the shared C library
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then maps in the various program segments in the user executable and jumps
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to the user executable's recorded entry point, as if the call had been made
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directly by the kernel.
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The traditional gdb method of using this info was to use the
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recorded entry point to set the entry-file's lowpc and highpc from
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the debugging information, where these values are the starting
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address (inclusive) and ending address (exclusive) of the
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instruction space in the executable which correspond to the
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"startup file", I.E. crt0.o in most cases. This file is assumed to
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be a startup file and frames with pc's inside it are treated as
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nonexistent. Setting these variables is necessary so that
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backtraces do not fly off the bottom of the stack.
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NOTE: cagney/2003-09-09: It turns out that this "traditional"
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method doesn't work. Corinna writes: ``It turns out that the call
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to test for "inside entry file" destroys a meaningful backtrace
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under some conditions. E. g. the backtrace tests in the asm-source
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testcase are broken for some targets. In this test the functions
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are all implemented as part of one file and the testcase is not
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necessarily linked with a start file (depending on the target).
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What happens is, that the first frame is printed normaly and
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following frames are treated as being inside the enttry file then.
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This way, only the #0 frame is printed in the backtrace output.''
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Ref "frame.c" "NOTE: vinschen/2003-04-01".
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Gdb also supports an alternate method to avoid running off the bottom
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of the stack.
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There are two frames that are "special", the frame for the function
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containing the process entry point, since it has no predecessor frame,
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and the frame for the function containing the user code entry point
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(the main() function), since all the predecessor frames are for the
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process startup code. Since we have no guarantee that the linked
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in startup modules have any debugging information that gdb can use,
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we need to avoid following frame pointers back into frames that might
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have been built in the startup code, as we might get hopelessly
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confused. However, we almost always have debugging information
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available for main().
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These variables are used to save the range of PC values which are
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valid within the main() function and within the function containing
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the process entry point. If we always consider the frame for
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main() as the outermost frame when debugging user code, and the
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frame for the process entry point function as the outermost frame
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when debugging startup code, then all we have to do is have
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DEPRECATED_FRAME_CHAIN_VALID return false whenever a frame's
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current PC is within the range specified by these variables. In
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essence, we set "ceilings" in the frame chain beyond which we will
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not proceed when following the frame chain back up the stack.
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A nice side effect is that we can still debug startup code without
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running off the end of the frame chain, assuming that we have usable
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debugging information in the startup modules, and if we choose to not
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use the block at main, or can't find it for some reason, everything
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still works as before. And if we have no startup code debugging
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information but we do have usable information for main(), backtraces
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from user code don't go wandering off into the startup code. */
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struct entry_info
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{
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/* The value we should use for this objects entry point.
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The illegal/unknown value needs to be something other than 0, ~0
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for instance, which is much less likely than 0. */
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CORE_ADDR entry_point;
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#define INVALID_ENTRY_POINT (~0) /* ~0 will not be in any file, we hope. */
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};
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/* Sections in an objfile. The section offsets are stored in the
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OBJFILE. */
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struct obj_section
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{
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struct bfd_section *the_bfd_section; /* BFD section pointer */
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/* Objfile this section is part of. */
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struct objfile *objfile;
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/* True if this "overlay section" is mapped into an "overlay region". */
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int ovly_mapped;
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};
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/* Relocation offset applied to S. */
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#define obj_section_offset(s) \
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(((s)->objfile->section_offsets)->offsets[(s)->the_bfd_section->index])
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/* The memory address of section S (vma + offset). */
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#define obj_section_addr(s) \
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(bfd_get_section_vma ((s)->objfile->abfd, s->the_bfd_section) \
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+ obj_section_offset (s))
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/* The one-passed-the-end memory address of section S
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(vma + size + offset). */
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#define obj_section_endaddr(s) \
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(bfd_get_section_vma ((s)->objfile->abfd, s->the_bfd_section) \
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+ bfd_get_section_size ((s)->the_bfd_section) \
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+ obj_section_offset (s))
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/* The "objstats" structure provides a place for gdb to record some
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interesting information about its internal state at runtime, on a
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per objfile basis, such as information about the number of symbols
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read, size of string table (if any), etc. */
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struct objstats
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{
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int n_minsyms; /* Number of minimal symbols read */
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int n_psyms; /* Number of partial symbols read */
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int n_syms; /* Number of full symbols read */
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int n_stabs; /* Number of ".stabs" read (if applicable) */
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int n_types; /* Number of types */
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int sz_strtab; /* Size of stringtable, (if applicable) */
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};
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#define OBJSTAT(objfile, expr) (objfile -> stats.expr)
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#define OBJSTATS struct objstats stats
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extern void print_objfile_statistics (void);
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extern void print_symbol_bcache_statistics (void);
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/* Number of entries in the minimal symbol hash table. */
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#define MINIMAL_SYMBOL_HASH_SIZE 2039
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/* Master structure for keeping track of each file from which
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gdb reads symbols. There are several ways these get allocated: 1.
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The main symbol file, symfile_objfile, set by the symbol-file command,
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2. Additional symbol files added by the add-symbol-file command,
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3. Shared library objfiles, added by ADD_SOLIB, 4. symbol files
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for modules that were loaded when GDB attached to a remote system
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(see remote-vx.c). */
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struct objfile
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{
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/* All struct objfile's are chained together by their next pointers.
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The global variable "object_files" points to the first link in this
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chain.
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FIXME: There is a problem here if the objfile is reusable, and if
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multiple users are to be supported. The problem is that the objfile
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list is linked through a member of the objfile struct itself, which
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is only valid for one gdb process. The list implementation needs to
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be changed to something like:
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struct list {struct list *next; struct objfile *objfile};
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where the list structure is completely maintained separately within
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each gdb process. */
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struct objfile *next;
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/* The object file's name, tilde-expanded and absolute.
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Malloc'd; free it if you free this struct. */
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char *name;
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/* Some flag bits for this objfile. */
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unsigned short flags;
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/* Each objfile points to a linked list of symtabs derived from this file,
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one symtab structure for each compilation unit (source file). Each link
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in the symtab list contains a backpointer to this objfile. */
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struct symtab *symtabs;
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/* Each objfile points to a linked list of partial symtabs derived from
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this file, one partial symtab structure for each compilation unit
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(source file). */
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struct partial_symtab *psymtabs;
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/* Map addresses to the entries of PSYMTABS. It would be more efficient to
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have a map per the whole process but ADDRMAP cannot selectively remove
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its items during FREE_OBJFILE. This mapping is already present even for
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PARTIAL_SYMTABs which still have no corresponding full SYMTABs read. */
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struct addrmap *psymtabs_addrmap;
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/* List of freed partial symtabs, available for re-use */
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struct partial_symtab *free_psymtabs;
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/* The object file's BFD. Can be null if the objfile contains only
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minimal symbols, e.g. the run time common symbols for SunOS4. */
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bfd *obfd;
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/* The gdbarch associated with the BFD. Note that this gdbarch is
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determined solely from BFD information, without looking at target
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information. The gdbarch determined from a running target may
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differ from this e.g. with respect to register types and names. */
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struct gdbarch *gdbarch;
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/* The modification timestamp of the object file, as of the last time
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we read its symbols. */
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long mtime;
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/* Obstack to hold objects that should be freed when we load a new symbol
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table from this object file. */
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struct obstack objfile_obstack;
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/* A byte cache where we can stash arbitrary "chunks" of bytes that
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will not change. */
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struct bcache *psymbol_cache; /* Byte cache for partial syms */
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struct bcache *macro_cache; /* Byte cache for macros */
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/* Hash table for mapping symbol names to demangled names. Each
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entry in the hash table is actually two consecutive strings,
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both null-terminated; the first one is a mangled or linkage
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name, and the second is the demangled name or just a zero byte
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if the name doesn't demangle. */
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struct htab *demangled_names_hash;
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/* Vectors of all partial symbols read in from file. The actual data
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is stored in the objfile_obstack. */
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struct psymbol_allocation_list global_psymbols;
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struct psymbol_allocation_list static_psymbols;
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/* Each file contains a pointer to an array of minimal symbols for all
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global symbols that are defined within the file. The array is terminated
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by a "null symbol", one that has a NULL pointer for the name and a zero
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value for the address. This makes it easy to walk through the array
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when passed a pointer to somewhere in the middle of it. There is also
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a count of the number of symbols, which does not include the terminating
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null symbol. The array itself, as well as all the data that it points
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to, should be allocated on the objfile_obstack for this file. */
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struct minimal_symbol *msymbols;
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int minimal_symbol_count;
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/* This is a hash table used to index the minimal symbols by name. */
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struct minimal_symbol *msymbol_hash[MINIMAL_SYMBOL_HASH_SIZE];
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/* This hash table is used to index the minimal symbols by their
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demangled names. */
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struct minimal_symbol *msymbol_demangled_hash[MINIMAL_SYMBOL_HASH_SIZE];
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/* Structure which keeps track of functions that manipulate objfile's
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of the same type as this objfile. I.E. the function to read partial
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symbols for example. Note that this structure is in statically
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allocated memory, and is shared by all objfiles that use the
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object module reader of this type. */
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struct sym_fns *sf;
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/* The per-objfile information about the entry point, the scope (file/func)
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containing the entry point, and the scope of the user's main() func. */
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struct entry_info ei;
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/* Information about stabs. Will be filled in with a dbx_symfile_info
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struct by those readers that need it. */
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/* NOTE: cagney/2004-10-23: This has been replaced by per-objfile
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data points implemented using "data" and "num_data" below. For
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an example of how to use this replacement, see "objfile_data"
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in "mips-tdep.c". */
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struct dbx_symfile_info *deprecated_sym_stab_info;
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/* Hook for information for use by the symbol reader (currently used
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for information shared by sym_init and sym_read). It is
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typically a pointer to malloc'd memory. The symbol reader's finish
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function is responsible for freeing the memory thusly allocated. */
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/* NOTE: cagney/2004-10-23: This has been replaced by per-objfile
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data points implemented using "data" and "num_data" below. For
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an example of how to use this replacement, see "objfile_data"
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in "mips-tdep.c". */
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void *deprecated_sym_private;
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/* Per objfile data-pointers required by other GDB modules. */
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/* FIXME: kettenis/20030711: This mechanism could replace
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deprecated_sym_stab_info and deprecated_sym_private
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entirely. */
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void **data;
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unsigned num_data;
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/* Set of relocation offsets to apply to each section.
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Currently on the objfile_obstack (which makes no sense, but I'm
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not sure it's harming anything).
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These offsets indicate that all symbols (including partial and
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minimal symbols) which have been read have been relocated by this
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much. Symbols which are yet to be read need to be relocated by
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it. */
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struct section_offsets *section_offsets;
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int num_sections;
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/* Indexes in the section_offsets array. These are initialized by the
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*_symfile_offsets() family of functions (som_symfile_offsets,
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xcoff_symfile_offsets, default_symfile_offsets). In theory they
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should correspond to the section indexes used by bfd for the
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current objfile. The exception to this for the time being is the
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SOM version. */
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int sect_index_text;
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int sect_index_data;
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int sect_index_bss;
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int sect_index_rodata;
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/* These pointers are used to locate the section table, which
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among other things, is used to map pc addresses into sections.
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SECTIONS points to the first entry in the table, and
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SECTIONS_END points to the first location past the last entry
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in the table. Currently the table is stored on the
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objfile_obstack (which makes no sense, but I'm not sure it's
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harming anything). */
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struct obj_section
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*sections, *sections_end;
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/* Link to objfile that contains the debug symbols for this one.
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One is loaded if this file has an debug link to an existing
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debug file with the right checksum */
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struct objfile *separate_debug_objfile;
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/* If this is a separate debug object, this is used as a link to the
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actual executable objfile. */
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struct objfile *separate_debug_objfile_backlink;
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/* Place to stash various statistics about this objfile */
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OBJSTATS;
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/* A symtab that the C++ code uses to stash special symbols
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associated to namespaces. */
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/* FIXME/carlton-2003-06-27: Delete this in a few years once
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"possible namespace symbols" go away. */
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struct symtab *cp_namespace_symtab;
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};
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/* Defines for the objfile flag word. */
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/* When an object file has its functions reordered (currently Irix-5.2
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shared libraries exhibit this behaviour), we will need an expensive
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algorithm to locate a partial symtab or symtab via an address.
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To avoid this penalty for normal object files, we use this flag,
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whose setting is determined upon symbol table read in. */
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#define OBJF_REORDERED (1 << 0) /* Functions are reordered */
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/* Distinguish between an objfile for a shared library and a "vanilla"
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objfile. (If not set, the objfile may still actually be a solib.
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This can happen if the user created the objfile by using the
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add-symbol-file command. GDB doesn't in that situation actually
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check whether the file is a solib. Rather, the target's
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implementation of the solib interface is responsible for setting
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this flag when noticing solibs used by an inferior.) */
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#define OBJF_SHARED (1 << 1) /* From a shared library */
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/* User requested that this objfile be read in it's entirety. */
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#define OBJF_READNOW (1 << 2) /* Immediate full read */
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/* This objfile was created because the user explicitly caused it
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(e.g., used the add-symbol-file command). This bit offers a way
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for run_command to remove old objfile entries which are no longer
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valid (i.e., are associated with an old inferior), but to preserve
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ones that the user explicitly loaded via the add-symbol-file
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command. */
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#define OBJF_USERLOADED (1 << 3) /* User loaded */
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/* The object file that the main symbol table was loaded from (e.g. the
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argument to the "symbol-file" or "file" command). */
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extern struct objfile *symfile_objfile;
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/* The object file that contains the runtime common minimal symbols
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for SunOS4. Note that this objfile has no associated BFD. */
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extern struct objfile *rt_common_objfile;
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/* When we need to allocate a new type, we need to know which objfile_obstack
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to allocate the type on, since there is one for each objfile. The places
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where types are allocated are deeply buried in function call hierarchies
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which know nothing about objfiles, so rather than trying to pass a
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particular objfile down to them, we just do an end run around them and
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set current_objfile to be whatever objfile we expect to be using at the
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time types are being allocated. For instance, when we start reading
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symbols for a particular objfile, we set current_objfile to point to that
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objfile, and when we are done, we set it back to NULL, to ensure that we
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never put a type someplace other than where we are expecting to put it.
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FIXME: Maybe we should review the entire type handling system and
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see if there is a better way to avoid this problem. */
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extern struct objfile *current_objfile;
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/* All known objfiles are kept in a linked list. This points to the
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root of this list. */
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extern struct objfile *object_files;
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/* Declarations for functions defined in objfiles.c */
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extern struct objfile *allocate_objfile (bfd *, int);
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extern struct gdbarch *get_objfile_arch (struct objfile *);
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extern void init_entry_point_info (struct objfile *);
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extern CORE_ADDR entry_point_address (void);
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extern int build_objfile_section_table (struct objfile *);
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extern void terminate_minimal_symbol_table (struct objfile *objfile);
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extern void put_objfile_before (struct objfile *, struct objfile *);
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extern void objfile_to_front (struct objfile *);
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extern void unlink_objfile (struct objfile *);
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extern void free_objfile (struct objfile *);
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extern struct cleanup *make_cleanup_free_objfile (struct objfile *);
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extern void free_all_objfiles (void);
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extern void objfile_relocate (struct objfile *, struct section_offsets *);
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extern int have_partial_symbols (void);
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|
||
extern int have_full_symbols (void);
|
||
|
||
extern void objfiles_changed (void);
|
||
|
||
/* 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.
|
||
*/
|
||
extern void objfile_purge_solibs (void);
|
||
|
||
/* Functions for dealing with the minimal symbol table, really a misc
|
||
address<->symbol mapping for things we don't have debug symbols for. */
|
||
|
||
extern int have_minimal_symbols (void);
|
||
|
||
extern struct obj_section *find_pc_section (CORE_ADDR pc);
|
||
|
||
extern int in_plt_section (CORE_ADDR, char *);
|
||
|
||
/* Keep a registry of per-objfile data-pointers required by other GDB
|
||
modules. */
|
||
|
||
extern const struct objfile_data *register_objfile_data (void);
|
||
extern const struct objfile_data *register_objfile_data_with_cleanup
|
||
(void (*cleanup) (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 void gdb_bfd_unref (struct bfd *abfd);
|
||
|
||
|
||
/* Traverse all object files. ALL_OBJFILES_SAFE works even if you delete
|
||
the objfile during the traversal. */
|
||
|
||
#define ALL_OBJFILES(obj) \
|
||
for ((obj) = object_files; (obj) != NULL; (obj) = (obj)->next)
|
||
|
||
#define ALL_OBJFILES_SAFE(obj,nxt) \
|
||
for ((obj) = object_files; \
|
||
(obj) != NULL? ((nxt)=(obj)->next,1) :0; \
|
||
(obj) = (nxt))
|
||
|
||
/* Traverse all symtabs in one objfile. */
|
||
|
||
#define ALL_OBJFILE_SYMTABS(objfile, s) \
|
||
for ((s) = (objfile) -> symtabs; (s) != NULL; (s) = (s) -> next)
|
||
|
||
/* Traverse all psymtabs in one objfile. */
|
||
|
||
#define ALL_OBJFILE_PSYMTABS(objfile, p) \
|
||
for ((p) = (objfile) -> psymtabs; (p) != NULL; (p) = (p) -> next)
|
||
|
||
/* Traverse all minimal symbols in one objfile. */
|
||
|
||
#define ALL_OBJFILE_MSYMBOLS(objfile, m) \
|
||
for ((m) = (objfile) -> msymbols; SYMBOL_LINKAGE_NAME(m) != NULL; (m)++)
|
||
|
||
/* Traverse all symtabs in all objfiles. */
|
||
|
||
#define ALL_SYMTABS(objfile, s) \
|
||
ALL_OBJFILES (objfile) \
|
||
ALL_OBJFILE_SYMTABS (objfile, s)
|
||
|
||
/* Traverse all symtabs in all objfiles, skipping included files
|
||
(which share a blockvector with their primary symtab). */
|
||
|
||
#define ALL_PRIMARY_SYMTABS(objfile, s) \
|
||
ALL_OBJFILES (objfile) \
|
||
ALL_OBJFILE_SYMTABS (objfile, s) \
|
||
if ((s)->primary)
|
||
|
||
/* Traverse all psymtabs in all objfiles. */
|
||
|
||
#define ALL_PSYMTABS(objfile, p) \
|
||
ALL_OBJFILES (objfile) \
|
||
ALL_OBJFILE_PSYMTABS (objfile, p)
|
||
|
||
/* Traverse all minimal symbols in all objfiles. */
|
||
|
||
#define ALL_MSYMBOLS(objfile, m) \
|
||
ALL_OBJFILES (objfile) \
|
||
ALL_OBJFILE_MSYMBOLS (objfile, m)
|
||
|
||
#define ALL_OBJFILE_OSECTIONS(objfile, osect) \
|
||
for (osect = objfile->sections; osect < objfile->sections_end; osect++)
|
||
|
||
#define ALL_OBJSECTIONS(objfile, osect) \
|
||
ALL_OBJFILES (objfile) \
|
||
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) \
|
||
: objfile->sect_index_data)
|
||
|
||
#define SECT_OFF_RODATA(objfile) \
|
||
((objfile->sect_index_rodata == -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) \
|
||
: 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. */
|
||
#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)
|
||
|
||
#endif /* !defined (OBJFILES_H) */
|