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666 lines
26 KiB
C
666 lines
26 KiB
C
/* Definitions for symbol file management in GDB.
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Copyright (C) 1992-2004, 2007-2012 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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#include "progspace.h"
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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 relocated value we should use for this objfile entry point. */
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CORE_ADDR entry_point;
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/* Set to 1 iff ENTRY_POINT contains a valid value. */
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unsigned entry_point_p : 1;
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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->obfd, 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->obfd, 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 program space field "objfiles" (frequently referenced via
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the macro "object_files") points to the first link in this
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chain. */
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struct objfile *next;
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/* The object file's name, tilde-expanded and absolute. Malloc'd; free it
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if you free this struct. This pointer is never NULL. */
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char *name;
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CORE_ADDR addr_low;
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/* Some flag bits for this objfile.
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The values are defined by OBJF_*. */
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unsigned short flags;
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/* The program space associated with this objfile. */
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struct program_space *pspace;
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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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/* Cached 32-bit CRC as computed by gnu_debuglink_crc32. CRC32 is valid
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iff CRC32_P. */
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unsigned long crc32;
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int crc32_p;
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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 psymbol_bcache *psymbol_cache; /* Byte cache for partial syms. */
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struct bcache *macro_cache; /* Byte cache for macros. */
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struct bcache *filename_cache; /* Byte cache for file names. */
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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
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terminated by a "null symbol", one that has a NULL pointer for the
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name and a zero value for the address. This makes it easy to walk
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through the array when passed a pointer to somewhere in the middle
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of it. There is also a count of the number of symbols, which does
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not include the terminating null symbol. The array itself, as well
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as all the data that it points to, should be allocated on the
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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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const 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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/* GDB allows to have debug symbols in separate object files. This is
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used by .gnu_debuglink, ELF build id note and Mach-O OSO.
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Although this is a tree structure, GDB only support one level
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(ie a separate debug for a separate debug is not supported). Note that
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separate debug object are in the main chain and therefore will be
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visited by ALL_OBJFILES & co iterators. Separate debug objfile always
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has a non-nul separate_debug_objfile_backlink. */
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/* Link to the first separate debug object, if any. */
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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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/* If this is a separate debug object, this is a link to the next one
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for the same executable objfile. */
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struct objfile *separate_debug_objfile_link;
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/* Place to stash various statistics about this objfile. */
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OBJSTATS;
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/* A linked list of symbols created when reading template types or
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function templates. These symbols are not stored in any symbol
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table, so we have to keep them here to relocate them
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properly. */
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struct symbol *template_symbols;
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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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/* Set if we have tried to read partial symtabs for this objfile.
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This is used to allow lazy reading of partial symtabs. */
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#define OBJF_PSYMTABS_READ (1 << 4)
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/* Set if this is the main symbol file
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(as opposed to symbol file for dynamically loaded code). */
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#define OBJF_MAINLINE (1 << 5)
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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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/* 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 int entry_point_address_query (CORE_ADDR *entry_p);
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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 struct objfile *objfile_separate_debug_iterate (const struct objfile *,
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const struct 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 add_separate_debug_objfile (struct objfile *, 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 void free_objfile_separate_debug (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 objfile_has_partial_symbols (struct objfile *objfile);
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extern int objfile_has_full_symbols (struct objfile *objfile);
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extern int objfile_has_symbols (struct objfile *objfile);
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extern int have_partial_symbols (void);
|
||
|
||
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. */
|
||
|
||
/* 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);
|
||
|
||
|
||
/* Traverse all object files in the current program space.
|
||
ALL_OBJFILES_SAFE works even if you delete the objfile during the
|
||
traversal. */
|
||
|
||
/* Traverse all object files in program space SS. */
|
||
|
||
#define ALL_PSPACE_OBJFILES(ss, obj) \
|
||
for ((obj) = ss->objfiles; (obj) != NULL; (obj) = (obj)->next) \
|
||
|
||
#define ALL_PSPACE_OBJFILES_SAFE(ss, obj, nxt) \
|
||
for ((obj) = ss->objfiles; \
|
||
(obj) != NULL? ((nxt)=(obj)->next,1) :0; \
|
||
(obj) = (nxt))
|
||
|
||
#define ALL_OBJFILES(obj) \
|
||
for ((obj) = current_program_space->objfiles; \
|
||
(obj) != NULL; \
|
||
(obj) = (obj)->next)
|
||
|
||
#define ALL_OBJFILES_SAFE(obj,nxt) \
|
||
for ((obj) = current_program_space->objfiles; \
|
||
(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 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 in the current symbol
|
||
space. */
|
||
|
||
#define ALL_SYMTABS(objfile, s) \
|
||
ALL_OBJFILES (objfile) \
|
||
ALL_OBJFILE_SYMTABS (objfile, s)
|
||
|
||
#define ALL_PSPACE_SYMTABS(ss, objfile, s) \
|
||
ALL_PSPACE_OBJFILES (ss, objfile) \
|
||
ALL_OBJFILE_SYMTABS (objfile, s)
|
||
|
||
/* Traverse all symtabs in all objfiles in the current program space,
|
||
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)
|
||
|
||
#define ALL_PSPACE_PRIMARY_SYMTABS(pspace, objfile, s) \
|
||
ALL_PSPACE_OBJFILES (ss, objfile) \
|
||
ALL_OBJFILE_SYMTABS (objfile, s) \
|
||
if ((s)->primary)
|
||
|
||
/* Traverse all minimal symbols in all objfiles in the current symbol
|
||
space. */
|
||
|
||
#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++)
|
||
|
||
/* Traverse all obj_sections in all objfiles in the current program
|
||
space.
|
||
|
||
Note that this detects a "break" in the inner loop, and exits
|
||
immediately from the outer loop as well, thus, client code doesn't
|
||
need to know that this is implemented with a double for. The extra
|
||
hair is to make sure that a "break;" stops the outer loop iterating
|
||
as well, and both OBJFILE and OSECT are left unmodified:
|
||
|
||
- The outer loop learns about the inner loop's end condition, and
|
||
stops iterating if it detects the inner loop didn't reach its
|
||
end. In other words, the outer loop keeps going only if the
|
||
inner loop reached its end cleanly [(osect) ==
|
||
(objfile)->sections_end].
|
||
|
||
- OSECT is initialized in the outer loop initialization
|
||
expressions, such as if the inner loop has reached its end, so
|
||
the check mentioned above succeeds the first time.
|
||
|
||
- The trick to not clearing OBJFILE on a "break;" is, in the outer
|
||
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). */
|
||
|
||
#define ALL_OBJSECTIONS(objfile, osect) \
|
||
for ((objfile) = current_program_space->objfiles, \
|
||
(objfile) != NULL ? ((osect) = (objfile)->sections_end) : 0; \
|
||
(objfile) != NULL \
|
||
&& (osect) == (objfile)->sections_end; \
|
||
((osect) == (objfile)->sections_end \
|
||
? ((objfile) = (objfile)->next, \
|
||
(objfile) != NULL ? (osect) = (objfile)->sections_end : 0) \
|
||
: 0)) \
|
||
for ((osect) = (objfile)->sections; \
|
||
(osect) < (objfile)->sections_end; \
|
||
(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) */
|