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buildsym.c
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/* Support routines for building symbol tables in GDB's internal format.
Copyright (C) 1986-2015 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* This module provides subroutines used for creating and adding to
the symbol table. These routines are called from various symbol-
file-reading routines.
Routines to support specific debugging information formats (stabs,
DWARF, etc) belong somewhere else.
The basic way this module is used is as follows:
buildsym_init ();
cleanups = make_cleanup (really_free_pendings, NULL);
cust = start_symtab (...);
... read debug info ...
cust = end_symtab (...);
do_cleanups (cleanups);
The compunit symtab pointer ("cust") is returned from both start_symtab
and end_symtab to simplify the debug info readers.
There are minor variations on this, e.g., dwarf2read.c splits end_symtab
into two calls: end_symtab_get_static_block, end_symtab_from_static_block,
but all debug info readers follow this basic flow.
Reading DWARF Type Units is another variation:
buildsym_init ();
cleanups = make_cleanup (really_free_pendings, NULL);
cust = start_symtab (...);
... read debug info ...
cust = end_expandable_symtab (...);
do_cleanups (cleanups);
And then reading subsequent Type Units within the containing "Comp Unit"
will use a second flow:
buildsym_init ();
cleanups = make_cleanup (really_free_pendings, NULL);
cust = restart_symtab (...);
... read debug info ...
cust = augment_type_symtab (...);
do_cleanups (cleanups);
dbxread.c and xcoffread.c use another variation:
buildsym_init ();
cleanups = make_cleanup (really_free_pendings, NULL);
cust = start_symtab (...);
... read debug info ...
cust = end_symtab (...);
... start_symtab + read + end_symtab repeated ...
do_cleanups (cleanups);
*/
#include "defs.h"
#include "bfd.h"
#include "gdb_obstack.h"
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdbtypes.h"
#include "complaints.h"
#include "expression.h" /* For "enum exp_opcode" used by... */
#include "bcache.h"
#include "filenames.h" /* For DOSish file names. */
#include "macrotab.h"
#include "demangle.h" /* Needed by SYMBOL_INIT_DEMANGLED_NAME. */
#include "block.h"
#include "cp-support.h"
#include "dictionary.h"
#include "addrmap.h"
/* Ask buildsym.h to define the vars it normally declares `extern'. */
#define EXTERN
/**/
#include "buildsym.h" /* Our own declarations. */
#undef EXTERN
/* For cleanup_undefined_stabs_types and finish_global_stabs (somewhat
questionable--see comment where we call them). */
#include "stabsread.h"
/* Buildsym's counterpart to struct compunit_symtab.
TODO(dje): Move all related global state into here. */
struct buildsym_compunit
{
/* The objfile we're reading debug info from. */
struct objfile *objfile;
/* List of subfiles (source files).
Files are added to the front of the list.
This is important mostly for the language determination hacks we use,
which iterate over previously added files. */
struct subfile *subfiles;
/* The subfile of the main source file. */
struct subfile *main_subfile;
/* E.g., DW_AT_comp_dir if DWARF. Space for this is malloc'd. */
char *comp_dir;
/* Space for this is not malloc'd, and is assumed to have at least
the same lifetime as objfile. */
const char *producer;
/* Space for this is not malloc'd, and is assumed to have at least
the same lifetime as objfile. */
const char *debugformat;
/* The compunit we are building. */
struct compunit_symtab *compunit_symtab;
};
/* The work-in-progress of the compunit we are building.
This is created first, before any subfiles by start_symtab. */
static struct buildsym_compunit *buildsym_compunit;
/* List of free `struct pending' structures for reuse. */
static struct pending *free_pendings;
/* Non-zero if symtab has line number info. This prevents an
otherwise empty symtab from being tossed. */
static int have_line_numbers;
/* The mutable address map for the compilation unit whose symbols
we're currently reading. The symtabs' shared blockvector will
point to a fixed copy of this. */
static struct addrmap *pending_addrmap;
/* The obstack on which we allocate pending_addrmap.
If pending_addrmap is NULL, this is uninitialized; otherwise, it is
initialized (and holds pending_addrmap). */
static struct obstack pending_addrmap_obstack;
/* Non-zero if we recorded any ranges in the addrmap that are
different from those in the blockvector already. We set this to
zero when we start processing a symfile, and if it's still zero at
the end, then we just toss the addrmap. */
static int pending_addrmap_interesting;
/* An obstack used for allocating pending blocks. */
static struct obstack pending_block_obstack;
/* List of blocks already made (lexical contexts already closed).
This is used at the end to make the blockvector. */
struct pending_block
{
struct pending_block *next;
struct block *block;
};
/* Pointer to the head of a linked list of symbol blocks which have
already been finalized (lexical contexts already closed) and which
are just waiting to be built into a blockvector when finalizing the
associated symtab. */
static struct pending_block *pending_blocks;
struct subfile_stack
{
struct subfile_stack *next;
char *name;
};
static struct subfile_stack *subfile_stack;
/* The macro table for the compilation unit whose symbols we're
currently reading. */
static struct macro_table *pending_macros;
static void free_buildsym_compunit (void);
static int compare_line_numbers (const void *ln1p, const void *ln2p);
static void record_pending_block (struct objfile *objfile,
struct block *block,
struct pending_block *opblock);
/* Initial sizes of data structures. These are realloc'd larger if
needed, and realloc'd down to the size actually used, when
completed. */
#define INITIAL_CONTEXT_STACK_SIZE 10
#define INITIAL_LINE_VECTOR_LENGTH 1000
/* Maintain the lists of symbols and blocks. */
/* Add a symbol to one of the lists of symbols. */
void
add_symbol_to_list (struct symbol *symbol, struct pending **listhead)
{
struct pending *link;
/* If this is an alias for another symbol, don't add it. */
if (symbol->ginfo.name && symbol->ginfo.name[0] == '#')
return;
/* We keep PENDINGSIZE symbols in each link of the list. If we
don't have a link with room in it, add a new link. */
if (*listhead == NULL || (*listhead)->nsyms == PENDINGSIZE)
{
if (free_pendings)
{
link = free_pendings;
free_pendings = link->next;
}
else
{
link = XNEW (struct pending);
}
link->next = *listhead;
*listhead = link;
link->nsyms = 0;
}
(*listhead)->symbol[(*listhead)->nsyms++] = symbol;
}
/* Find a symbol named NAME on a LIST. NAME need not be
'\0'-terminated; LENGTH is the length of the name. */
struct symbol *
find_symbol_in_list (struct pending *list, char *name, int length)
{
int j;
const char *pp;
while (list != NULL)
{
for (j = list->nsyms; --j >= 0;)
{
pp = SYMBOL_LINKAGE_NAME (list->symbol[j]);
if (*pp == *name && strncmp (pp, name, length) == 0
&& pp[length] == '\0')
{
return (list->symbol[j]);
}
}
list = list->next;
}
return (NULL);
}
/* At end of reading syms, or in case of quit, ensure everything associated
with building symtabs is freed. This is intended to be registered as a
cleanup before doing psymtab->symtab expansion.
N.B. This is *not* intended to be used when building psymtabs. Some debug
info readers call this anyway, which is harmless if confusing. */
void
really_free_pendings (void *dummy)
{
struct pending *next, *next1;
for (next = free_pendings; next; next = next1)
{
next1 = next->next;
xfree ((void *) next);
}
free_pendings = NULL;
free_pending_blocks ();
for (next = file_symbols; next != NULL; next = next1)
{
next1 = next->next;
xfree ((void *) next);
}
file_symbols = NULL;
for (next = global_symbols; next != NULL; next = next1)
{
next1 = next->next;
xfree ((void *) next);
}
global_symbols = NULL;
if (pending_macros)
free_macro_table (pending_macros);
pending_macros = NULL;
if (pending_addrmap)
obstack_free (&pending_addrmap_obstack, NULL);
pending_addrmap = NULL;
free_buildsym_compunit ();
}
/* This function is called to discard any pending blocks. */
void
free_pending_blocks (void)
{
if (pending_blocks != NULL)
{
obstack_free (&pending_block_obstack, NULL);
pending_blocks = NULL;
}
}
/* Take one of the lists of symbols and make a block from it. Keep
the order the symbols have in the list (reversed from the input
file). Put the block on the list of pending blocks. */
static struct block *
finish_block_internal (struct symbol *symbol,
struct pending **listhead,
struct pending_block *old_blocks,
const struct dynamic_prop *static_link,
CORE_ADDR start, CORE_ADDR end,
int is_global, int expandable)
{
struct objfile *objfile = buildsym_compunit->objfile;
struct gdbarch *gdbarch = get_objfile_arch (objfile);
struct pending *next, *next1;
struct block *block;
struct pending_block *pblock;
struct pending_block *opblock;
block = (is_global
? allocate_global_block (&objfile->objfile_obstack)
: allocate_block (&objfile->objfile_obstack));
if (symbol)
{
BLOCK_DICT (block) = dict_create_linear (&objfile->objfile_obstack,
*listhead);
}
else
{
if (expandable)
{
BLOCK_DICT (block) = dict_create_hashed_expandable ();
dict_add_pending (BLOCK_DICT (block), *listhead);
}
else
{
BLOCK_DICT (block) =
dict_create_hashed (&objfile->objfile_obstack, *listhead);
}
}
BLOCK_START (block) = start;
BLOCK_END (block) = end;
/* Put the block in as the value of the symbol that names it. */
if (symbol)
{
struct type *ftype = SYMBOL_TYPE (symbol);
struct dict_iterator iter;
SYMBOL_BLOCK_VALUE (symbol) = block;
BLOCK_FUNCTION (block) = symbol;
if (TYPE_NFIELDS (ftype) <= 0)
{
/* No parameter type information is recorded with the
function's type. Set that from the type of the
parameter symbols. */
int nparams = 0, iparams;
struct symbol *sym;
/* Here we want to directly access the dictionary, because
we haven't fully initialized the block yet. */
ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
{
if (SYMBOL_IS_ARGUMENT (sym))
nparams++;
}
if (nparams > 0)
{
TYPE_NFIELDS (ftype) = nparams;
TYPE_FIELDS (ftype) = (struct field *)
TYPE_ALLOC (ftype, nparams * sizeof (struct field));
iparams = 0;
/* Here we want to directly access the dictionary, because
we haven't fully initialized the block yet. */
ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
{
if (iparams == nparams)
break;
if (SYMBOL_IS_ARGUMENT (sym))
{
TYPE_FIELD_TYPE (ftype, iparams) = SYMBOL_TYPE (sym);
TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
iparams++;
}
}
}
}
}
else
{
BLOCK_FUNCTION (block) = NULL;
}
if (static_link != NULL)
objfile_register_static_link (objfile, block, static_link);
/* Now "free" the links of the list, and empty the list. */
for (next = *listhead; next; next = next1)
{
next1 = next->next;
next->next = free_pendings;
free_pendings = next;
}
*listhead = NULL;
/* Check to be sure that the blocks have an end address that is
greater than starting address. */
if (BLOCK_END (block) < BLOCK_START (block))
{
if (symbol)
{
complaint (&symfile_complaints,
_("block end address less than block "
"start address in %s (patched it)"),
SYMBOL_PRINT_NAME (symbol));
}
else
{
complaint (&symfile_complaints,
_("block end address %s less than block "
"start address %s (patched it)"),
paddress (gdbarch, BLOCK_END (block)),
paddress (gdbarch, BLOCK_START (block)));
}
/* Better than nothing. */
BLOCK_END (block) = BLOCK_START (block);
}
/* Install this block as the superblock of all blocks made since the
start of this scope that don't have superblocks yet. */
opblock = NULL;
for (pblock = pending_blocks;
pblock && pblock != old_blocks;
pblock = pblock->next)
{
if (BLOCK_SUPERBLOCK (pblock->block) == NULL)
{
/* Check to be sure the blocks are nested as we receive
them. If the compiler/assembler/linker work, this just
burns a small amount of time.
Skip blocks which correspond to a function; they're not
physically nested inside this other blocks, only
lexically nested. */
if (BLOCK_FUNCTION (pblock->block) == NULL
&& (BLOCK_START (pblock->block) < BLOCK_START (block)
|| BLOCK_END (pblock->block) > BLOCK_END (block)))
{
if (symbol)
{
complaint (&symfile_complaints,
_("inner block not inside outer block in %s"),
SYMBOL_PRINT_NAME (symbol));
}
else
{
complaint (&symfile_complaints,
_("inner block (%s-%s) not "
"inside outer block (%s-%s)"),
paddress (gdbarch, BLOCK_START (pblock->block)),
paddress (gdbarch, BLOCK_END (pblock->block)),
paddress (gdbarch, BLOCK_START (block)),
paddress (gdbarch, BLOCK_END (block)));
}
if (BLOCK_START (pblock->block) < BLOCK_START (block))
BLOCK_START (pblock->block) = BLOCK_START (block);
if (BLOCK_END (pblock->block) > BLOCK_END (block))
BLOCK_END (pblock->block) = BLOCK_END (block);
}
BLOCK_SUPERBLOCK (pblock->block) = block;
}
opblock = pblock;
}
block_set_using (block,
(is_global
? global_using_directives
: local_using_directives),
&objfile->objfile_obstack);
if (is_global)
global_using_directives = NULL;
else
local_using_directives = NULL;
record_pending_block (objfile, block, opblock);
return block;
}
struct block *
finish_block (struct symbol *symbol,
struct pending **listhead,
struct pending_block *old_blocks,
const struct dynamic_prop *static_link,
CORE_ADDR start, CORE_ADDR end)
{
return finish_block_internal (symbol, listhead, old_blocks, static_link,
start, end, 0, 0);
}
/* Record BLOCK on the list of all blocks in the file. Put it after
OPBLOCK, or at the beginning if opblock is NULL. This puts the
block in the list after all its subblocks.
Allocate the pending block struct in the objfile_obstack to save
time. This wastes a little space. FIXME: Is it worth it? */
static void
record_pending_block (struct objfile *objfile, struct block *block,
struct pending_block *opblock)
{
struct pending_block *pblock;
if (pending_blocks == NULL)
obstack_init (&pending_block_obstack);
pblock = XOBNEW (&pending_block_obstack, struct pending_block);
pblock->block = block;
if (opblock)
{
pblock->next = opblock->next;
opblock->next = pblock;
}
else
{
pblock->next = pending_blocks;
pending_blocks = pblock;
}
}
/* Record that the range of addresses from START to END_INCLUSIVE
(inclusive, like it says) belongs to BLOCK. BLOCK's start and end
addresses must be set already. You must apply this function to all
BLOCK's children before applying it to BLOCK.
If a call to this function complicates the picture beyond that
already provided by BLOCK_START and BLOCK_END, then we create an
address map for the block. */
void
record_block_range (struct block *block,
CORE_ADDR start, CORE_ADDR end_inclusive)
{
/* If this is any different from the range recorded in the block's
own BLOCK_START and BLOCK_END, then note that the address map has
become interesting. Note that even if this block doesn't have
any "interesting" ranges, some later block might, so we still
need to record this block in the addrmap. */
if (start != BLOCK_START (block)
|| end_inclusive + 1 != BLOCK_END (block))
pending_addrmap_interesting = 1;
if (! pending_addrmap)
{
obstack_init (&pending_addrmap_obstack);
pending_addrmap = addrmap_create_mutable (&pending_addrmap_obstack);
}
addrmap_set_empty (pending_addrmap, start, end_inclusive, block);
}
static struct blockvector *
make_blockvector (void)
{
struct objfile *objfile = buildsym_compunit->objfile;
struct pending_block *next;
struct blockvector *blockvector;
int i;
/* Count the length of the list of blocks. */
for (next = pending_blocks, i = 0; next; next = next->next, i++)
{;
}
blockvector = (struct blockvector *)
obstack_alloc (&objfile->objfile_obstack,
(sizeof (struct blockvector)
+ (i - 1) * sizeof (struct block *)));
/* Copy the blocks into the blockvector. This is done in reverse
order, which happens to put the blocks into the proper order
(ascending starting address). finish_block has hair to insert
each block into the list after its subblocks in order to make
sure this is true. */
BLOCKVECTOR_NBLOCKS (blockvector) = i;
for (next = pending_blocks; next; next = next->next)
{
BLOCKVECTOR_BLOCK (blockvector, --i) = next->block;
}
free_pending_blocks ();
/* If we needed an address map for this symtab, record it in the
blockvector. */
if (pending_addrmap && pending_addrmap_interesting)
BLOCKVECTOR_MAP (blockvector)
= addrmap_create_fixed (pending_addrmap, &objfile->objfile_obstack);
else
BLOCKVECTOR_MAP (blockvector) = 0;
/* Some compilers output blocks in the wrong order, but we depend on
their being in the right order so we can binary search. Check the
order and moan about it.
Note: Remember that the first two blocks are the global and static
blocks. We could special case that fact and begin checking at block 2.
To avoid making that assumption we do not. */
if (BLOCKVECTOR_NBLOCKS (blockvector) > 1)
{
for (i = 1; i < BLOCKVECTOR_NBLOCKS (blockvector); i++)
{
if (BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i - 1))
> BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i)))
{
CORE_ADDR start
= BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i));
complaint (&symfile_complaints, _("block at %s out of order"),
hex_string ((LONGEST) start));
}
}
}
return (blockvector);
}
/* Start recording information about source code that came from an
included (or otherwise merged-in) source file with a different
name. NAME is the name of the file (cannot be NULL). */
void
start_subfile (const char *name)
{
const char *subfile_dirname;
struct subfile *subfile;
gdb_assert (buildsym_compunit != NULL);
subfile_dirname = buildsym_compunit->comp_dir;
/* See if this subfile is already registered. */
for (subfile = buildsym_compunit->subfiles; subfile; subfile = subfile->next)
{
char *subfile_name;
/* If NAME is an absolute path, and this subfile is not, then
attempt to create an absolute path to compare. */
if (IS_ABSOLUTE_PATH (name)
&& !IS_ABSOLUTE_PATH (subfile->name)
&& subfile_dirname != NULL)
subfile_name = concat (subfile_dirname, SLASH_STRING,
subfile->name, (char *) NULL);
else
subfile_name = subfile->name;
if (FILENAME_CMP (subfile_name, name) == 0)
{
current_subfile = subfile;
if (subfile_name != subfile->name)
xfree (subfile_name);
return;
}
if (subfile_name != subfile->name)
xfree (subfile_name);
}
/* This subfile is not known. Add an entry for it. */
subfile = XNEW (struct subfile);
memset (subfile, 0, sizeof (struct subfile));
subfile->buildsym_compunit = buildsym_compunit;
subfile->next = buildsym_compunit->subfiles;
buildsym_compunit->subfiles = subfile;
current_subfile = subfile;
subfile->name = xstrdup (name);
/* Initialize line-number recording for this subfile. */
subfile->line_vector = NULL;
/* Default the source language to whatever can be deduced from the
filename. If nothing can be deduced (such as for a C/C++ include
file with a ".h" extension), then inherit whatever language the
previous subfile had. This kludgery is necessary because there
is no standard way in some object formats to record the source
language. Also, when symtabs are allocated we try to deduce a
language then as well, but it is too late for us to use that
information while reading symbols, since symtabs aren't allocated
until after all the symbols have been processed for a given
source file. */
subfile->language = deduce_language_from_filename (subfile->name);
if (subfile->language == language_unknown
&& subfile->next != NULL)
{
subfile->language = subfile->next->language;
}
/* If the filename of this subfile ends in .C, then change the
language of any pending subfiles from C to C++. We also accept
any other C++ suffixes accepted by deduce_language_from_filename. */
/* Likewise for f2c. */
if (subfile->name)
{
struct subfile *s;
enum language sublang = deduce_language_from_filename (subfile->name);
if (sublang == language_cplus || sublang == language_fortran)
for (s = buildsym_compunit->subfiles; s != NULL; s = s->next)
if (s->language == language_c)
s->language = sublang;
}
/* And patch up this file if necessary. */
if (subfile->language == language_c
&& subfile->next != NULL
&& (subfile->next->language == language_cplus
|| subfile->next->language == language_fortran))
{
subfile->language = subfile->next->language;
}
}
/* Start recording information about a primary source file (IOW, not an
included source file).
COMP_DIR is the directory in which the compilation unit was compiled
(or NULL if not known). */
static struct buildsym_compunit *
start_buildsym_compunit (struct objfile *objfile, const char *comp_dir)
{
struct buildsym_compunit *bscu;
bscu = XNEW (struct buildsym_compunit);
memset (bscu, 0, sizeof (struct buildsym_compunit));
bscu->objfile = objfile;
bscu->comp_dir = (comp_dir == NULL) ? NULL : xstrdup (comp_dir);
/* Initialize the debug format string to NULL. We may supply it
later via a call to record_debugformat. */
bscu->debugformat = NULL;
/* Similarly for the producer. */
bscu->producer = NULL;
return bscu;
}
/* Delete the buildsym compunit. */
static void
free_buildsym_compunit (void)
{
struct subfile *subfile, *nextsub;
if (buildsym_compunit == NULL)
return;
for (subfile = buildsym_compunit->subfiles;
subfile != NULL;
subfile = nextsub)
{
nextsub = subfile->next;
xfree (subfile->name);
xfree (subfile->line_vector);
xfree (subfile);
}
xfree (buildsym_compunit->comp_dir);
xfree (buildsym_compunit);
buildsym_compunit = NULL;
current_subfile = NULL;
}
/* For stabs readers, the first N_SO symbol is assumed to be the
source file name, and the subfile struct is initialized using that
assumption. If another N_SO symbol is later seen, immediately
following the first one, then the first one is assumed to be the
directory name and the second one is really the source file name.
So we have to patch up the subfile struct by moving the old name
value to dirname and remembering the new name. Some sanity
checking is performed to ensure that the state of the subfile
struct is reasonable and that the old name we are assuming to be a
directory name actually is (by checking for a trailing '/'). */
void
patch_subfile_names (struct subfile *subfile, char *name)
{
if (subfile != NULL
&& buildsym_compunit->comp_dir == NULL
&& subfile->name != NULL
&& IS_DIR_SEPARATOR (subfile->name[strlen (subfile->name) - 1]))
{
buildsym_compunit->comp_dir = subfile->name;
subfile->name = xstrdup (name);
set_last_source_file (name);
/* Default the source language to whatever can be deduced from
the filename. If nothing can be deduced (such as for a C/C++
include file with a ".h" extension), then inherit whatever
language the previous subfile had. This kludgery is
necessary because there is no standard way in some object
formats to record the source language. Also, when symtabs
are allocated we try to deduce a language then as well, but
it is too late for us to use that information while reading
symbols, since symtabs aren't allocated until after all the
symbols have been processed for a given source file. */
subfile->language = deduce_language_from_filename (subfile->name);
if (subfile->language == language_unknown
&& subfile->next != NULL)
{
subfile->language = subfile->next->language;
}
}
}
/* Handle the N_BINCL and N_EINCL symbol types that act like N_SOL for
switching source files (different subfiles, as we call them) within
one object file, but using a stack rather than in an arbitrary
order. */
void
push_subfile (void)
{
struct subfile_stack *tem = XNEW (struct subfile_stack);
tem->next = subfile_stack;
subfile_stack = tem;
if (current_subfile == NULL || current_subfile->name == NULL)
{
internal_error (__FILE__, __LINE__,
_("failed internal consistency check"));
}
tem->name = current_subfile->name;
}
char *
pop_subfile (void)
{
char *name;
struct subfile_stack *link = subfile_stack;
if (link == NULL)
{
internal_error (__FILE__, __LINE__,
_("failed internal consistency check"));
}
name = link->name;
subfile_stack = link->next;
xfree ((void *) link);
return (name);
}
/* Add a linetable entry for line number LINE and address PC to the
line vector for SUBFILE. */
void
record_line (struct subfile *subfile, int line, CORE_ADDR pc)
{
struct linetable_entry *e;
/* Ignore the dummy line number in libg.o */
if (line == 0xffff)
{
return;
}
/* Make sure line vector exists and is big enough. */
if (!subfile->line_vector)
{
subfile->line_vector_length = INITIAL_LINE_VECTOR_LENGTH;
subfile->line_vector = (struct linetable *)
xmalloc (sizeof (struct linetable)
+ subfile->line_vector_length * sizeof (struct linetable_entry));
subfile->line_vector->nitems = 0;
have_line_numbers = 1;
}
if (subfile->line_vector->nitems + 1 >= subfile->line_vector_length)
{
subfile->line_vector_length *= 2;
subfile->line_vector = (struct linetable *)
xrealloc ((char *) subfile->line_vector,
(sizeof (struct linetable)
+ (subfile->line_vector_length
* sizeof (struct linetable_entry))));
}
/* Normally, we treat lines as unsorted. But the end of sequence
marker is special. We sort line markers at the same PC by line
number, so end of sequence markers (which have line == 0) appear
first. This is right if the marker ends the previous function,
and there is no padding before the next function. But it is
wrong if the previous line was empty and we are now marking a
switch to a different subfile. We must leave the end of sequence
marker at the end of this group of lines, not sort the empty line
to after the marker. The easiest way to accomplish this is to
delete any empty lines from our table, if they are followed by
end of sequence markers. All we lose is the ability to set
breakpoints at some lines which contain no instructions
anyway. */
if (line == 0 && subfile->line_vector->nitems > 0)
{
e = subfile->line_vector->item + subfile->line_vector->nitems - 1;
while (subfile->line_vector->nitems > 0 && e->pc == pc)
{
e--;
subfile->line_vector->nitems--;
}
}
e = subfile->line_vector->item + subfile->line_vector->nitems++;
e->line = line;
e->pc = pc;
}
/* Needed in order to sort line tables from IBM xcoff files. Sigh! */
static int
compare_line_numbers (const void *ln1p, const void *ln2p)
{
struct linetable_entry *ln1 = (struct linetable_entry *) ln1p;
struct linetable_entry *ln2 = (struct linetable_entry *) ln2p;
/* Note: this code does not assume that CORE_ADDRs can fit in ints.
Please keep it that way. */
if (ln1->pc < ln2->pc)
return -1;
if (ln1->pc > ln2->pc)
return 1;
/* If pc equal, sort by line. I'm not sure whether this is optimum
behavior (see comment at struct linetable in symtab.h). */
return ln1->line - ln2->line;
}
/* See buildsym.h. */
struct compunit_symtab *
buildsym_compunit_symtab (void)
{
gdb_assert (buildsym_compunit != NULL);
return buildsym_compunit->compunit_symtab;
}
/* See buildsym.h. */
struct macro_table *
get_macro_table (void)
{
struct objfile *objfile;
gdb_assert (buildsym_compunit != NULL);
objfile = buildsym_compunit->objfile;