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2002-10-08 Petr Sorfa <petrs@caldera.com>

Browse Source 
Revised and re-submitted by John Wolfe <jlw@caldera.com>

Move the Dwarf 2 abbrev table to a per-compilation-unit structure,
so we can work on more than one compilation unit at a time.  This
helps prepare GDB to handle inter-CU die references.
* dwarf2read.c (ABBREV_HASH_SIZE): moved definition forward in
the code to be defined before struct comp_unit_head.
(comp_unit_head): Added new members - offset, cu_head,
begin_die, next and dwarf2_abbrevs.
(dwarf2_abbrevs): Removed single static var; now member of
struct comp_unit_head.
dwarf2_build_psymtabs_hard): Complete new struct comp_unit_head
members.
(psymtab_to_symtab_1): Changed to work with the new
struct comp_unit_head.
(dwarf2_read_abbrevs): Now accepts a cu_header parameter and
constructs the dwarf2_abbrevs[] inside the cu_header.
(dwarf2_empty_abbrev_table): Now expects a ptr to a
dwarf2_abbrev table to clean up.
(dwarf2_lookup_abbrev): Now accepts a cu_header parameter and
handling of dwarf2_abbrevs inside the cu_header.
(read_partial_die): Now supports the call to the new
dwarf2_lookup_abbrev.
(read_full_die): Now supports the call to the new
dwarf2_lookup_abbrev.
This commit is contained in:
Jim Blandy 2002-10-09 04:43:49 +00:00
parent d14a0ab1e1
commit 57349743d5
2 changed files with 86 additions and 27 deletions
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28
gdb/ChangeLog
View File

@ -1,3 +1,31 @@
2002-10-08 Petr Sorfa <petrs@caldera.com>
Revised and re-submitted by John Wolfe <jlw@caldera.com>
Move the Dwarf 2 abbrev table to a per-compilation-unit structure,
so we can work on more than one compilation unit at a time. This
helps prepare GDB to handle inter-CU die references.
* dwarf2read.c (ABBREV_HASH_SIZE): moved definition forward in
the code to be defined before struct comp_unit_head.
(comp_unit_head): Added new members - offset, cu_head,
begin_die, next and dwarf2_abbrevs.
(dwarf2_abbrevs): Removed single static var; now member of
struct comp_unit_head.
dwarf2_build_psymtabs_hard): Complete new struct comp_unit_head
members.
(psymtab_to_symtab_1): Changed to work with the new
struct comp_unit_head.
(dwarf2_read_abbrevs): Now accepts a cu_header parameter and
constructs the dwarf2_abbrevs[] inside the cu_header.
(dwarf2_empty_abbrev_table): Now expects a ptr to a
dwarf2_abbrev table to clean up.
(dwarf2_lookup_abbrev): Now accepts a cu_header parameter and
handling of dwarf2_abbrevs inside the cu_header.
(read_partial_die): Now supports the call to the new
dwarf2_lookup_abbrev.
(read_full_die): Now supports the call to the new
dwarf2_lookup_abbrev.
2002-10-06 Christopher Faylor <cgf@redhat.com>
* Makefile.in (install-gdbtk): Add missing continuation backslash to

85
gdb/dwarf2read.c
View File

@ -162,6 +162,11 @@ unsigned int dwarf_eh_frame_size;
/* local data types */
/* We hold several abbreviation tables in memory at the same time. */
#ifndef ABBREV_HASH_SIZE
#define ABBREV_HASH_SIZE 121
#endif
/* The data in a compilation unit header, after target2host
translation, looks like this. */
struct comp_unit_head
@ -174,6 +179,29 @@ struct comp_unit_head
unsigned int offset_size; /* size of file offsets; either 4 or 8 */
unsigned int initial_length_size; /* size of the length field; either
4 or 12 */
/* Offset to the first byte of this compilation unit header in the
* .debug_info section, for resolving relative reference dies. */
unsigned int offset;
/* Pointer to this compilation unit header in the .debug_info
* section */
char *cu_head_ptr;
/* Pointer to the first die of this compilatio unit. This will
* be the first byte following the compilation unit header. */
char *first_die_ptr;
/* Pointer to the next compilation unit header in the program. */
struct comp_unit_head *next;
/* DWARF abbreviation table associated with this compilation unit */
struct abbrev_info *dwarf2_abbrevs[ABBREV_HASH_SIZE];
};
/* The line number information for a compilation unit (found in the
@ -312,17 +340,10 @@ struct dwarf_block
char *data;
};
/* We only hold one compilation unit's abbrevs in
memory at any one time. */
#ifndef ABBREV_HASH_SIZE
#define ABBREV_HASH_SIZE 121
#endif
#ifndef ATTR_ALLOC_CHUNK
#define ATTR_ALLOC_CHUNK 4
#endif
static struct abbrev_info *dwarf2_abbrevs[ABBREV_HASH_SIZE];
/* A hash table of die offsets for following references. */
#ifndef REF_HASH_SIZE
#define REF_HASH_SIZE 1021
@ -686,11 +707,12 @@ static void psymtab_to_symtab_1 (struct partial_symtab *);
char *dwarf2_read_section (struct objfile *, file_ptr, unsigned int);
static void dwarf2_read_abbrevs (bfd *, unsigned int);
static void dwarf2_read_abbrevs (bfd *abfd, struct comp_unit_head *cu_header);
static void dwarf2_empty_abbrev_table (PTR);
static struct abbrev_info *dwarf2_lookup_abbrev (unsigned int);
static struct abbrev_info *dwarf2_lookup_abbrev (unsigned int,
const struct comp_unit_head *cu_header);
static char *read_partial_die (struct partial_die_info *,
bfd *, char *,
@ -1211,9 +1233,14 @@ dwarf2_build_psymtabs_hard (struct objfile *objfile, int mainline)
(long) (beg_of_comp_unit - dwarf_info_buffer));
return;
}
/* Complete the cu_header */
cu_header.offset = beg_of_comp_unit - dwarf_info_buffer;
cu_header.first_die_ptr = info_ptr;
cu_header.cu_head_ptr = beg_of_comp_unit;
/* Read the abbrevs for this compilation unit into a table */
dwarf2_read_abbrevs (abfd, cu_header.abbrev_offset);
make_cleanup (dwarf2_empty_abbrev_table, NULL);
dwarf2_read_abbrevs (abfd, &cu_header);
make_cleanup (dwarf2_empty_abbrev_table, cu_header.dwarf2_abbrevs);
/* Read the compilation unit die */
info_ptr = read_partial_die (&comp_unit_die, abfd, info_ptr,
@ -1560,8 +1587,8 @@ psymtab_to_symtab_1 (struct partial_symtab *pst)
info_ptr = read_comp_unit_head (&cu_header, info_ptr, abfd);
/* Read the abbrevs for this compilation unit */
dwarf2_read_abbrevs (abfd, cu_header.abbrev_offset);
make_cleanup (dwarf2_empty_abbrev_table, NULL);
dwarf2_read_abbrevs (abfd, &cu_header);
make_cleanup (dwarf2_empty_abbrev_table, cu_header.dwarf2_abbrevs);
dies = read_comp_unit (info_ptr, abfd, &cu_header);
@ -3345,17 +3372,18 @@ dwarf2_read_section (struct objfile *objfile, file_ptr offset,
in a hash table. */
static void
dwarf2_read_abbrevs (bfd *abfd, unsigned int offset)
dwarf2_read_abbrevs (bfd *abfd, struct comp_unit_head *cu_header)
{
char *abbrev_ptr;
struct abbrev_info *cur_abbrev;
unsigned int abbrev_number, bytes_read, abbrev_name;
unsigned int abbrev_form, hash_number;
/* empty the table */
dwarf2_empty_abbrev_table (NULL);
/* Initialize dwarf2 abbrevs */
memset (cu_header->dwarf2_abbrevs, 0,
ABBREV_HASH_SIZE*sizeof (struct abbrev_info *));
abbrev_ptr = dwarf_abbrev_buffer + offset;
abbrev_ptr = dwarf_abbrev_buffer + cu_header->abbrev_offset;
abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
abbrev_ptr += bytes_read;
@ -3394,8 +3422,8 @@ dwarf2_read_abbrevs (bfd *abfd, unsigned int offset)
}
hash_number = abbrev_number % ABBREV_HASH_SIZE;
cur_abbrev->next = dwarf2_abbrevs[hash_number];
dwarf2_abbrevs[hash_number] = cur_abbrev;
cur_abbrev->next = cu_header->dwarf2_abbrevs[hash_number];
cu_header->dwarf2_abbrevs[hash_number] = cur_abbrev;
/* Get next abbreviation.
Under Irix6 the abbreviations for a compilation unit are not
@ -3409,7 +3437,7 @@ dwarf2_read_abbrevs (bfd *abfd, unsigned int offset)
break;
abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
abbrev_ptr += bytes_read;
if (dwarf2_lookup_abbrev (abbrev_number) != NULL)
if (dwarf2_lookup_abbrev (abbrev_number, cu_header) != NULL)
break;
}
}
@ -3418,15 +3446,18 @@ dwarf2_read_abbrevs (bfd *abfd, unsigned int offset)
/* ARGSUSED */
static void
dwarf2_empty_abbrev_table (PTR ignore)
dwarf2_empty_abbrev_table (PTR ptr_to_abbrevs_table)
{
int i;
struct abbrev_info *abbrev, *next;
struct abbrev_info **abbrevs;
abbrevs = (struct abbrev_info **)ptr_to_abbrevs_table;
for (i = 0; i < ABBREV_HASH_SIZE; ++i)
{
next = NULL;
abbrev = dwarf2_abbrevs[i];
abbrev = abbrevs[i];
while (abbrev)
{
next = abbrev->next;
@ -3434,20 +3465,20 @@ dwarf2_empty_abbrev_table (PTR ignore)
xfree (abbrev);
abbrev = next;
}
dwarf2_abbrevs[i] = NULL;
abbrevs[i] = NULL;
}
}
/* Lookup an abbrev_info structure in the abbrev hash table. */
static struct abbrev_info *
dwarf2_lookup_abbrev (unsigned int number)
dwarf2_lookup_abbrev (unsigned int number, const struct comp_unit_head *cu_header)
{
unsigned int hash_number;
struct abbrev_info *abbrev;
hash_number = number % ABBREV_HASH_SIZE;
abbrev = dwarf2_abbrevs[hash_number];
abbrev = cu_header->dwarf2_abbrevs[hash_number];
while (abbrev)
{
@ -3479,7 +3510,7 @@ read_partial_die (struct partial_die_info *part_die, bfd *abfd,
if (!abbrev_number)
return info_ptr;
abbrev = dwarf2_lookup_abbrev (abbrev_number);
abbrev = dwarf2_lookup_abbrev (abbrev_number, cu_header);
if (!abbrev)
{
error ("Dwarf Error: Could not find abbrev number %d.", abbrev_number);
@ -3623,7 +3654,7 @@ read_full_die (struct die_info **diep, bfd *abfd, char *info_ptr,
return info_ptr;
}
abbrev = dwarf2_lookup_abbrev (abbrev_number);
abbrev = dwarf2_lookup_abbrev (abbrev_number, cu_header);
if (!abbrev)
{
error ("Dwarf Error: could not find abbrev number %d.", abbrev_number);