From 433df2d4d071b2cb42c7ebd15a81b19f046ca0af Mon Sep 17 00:00:00 2001 From: Doug Evans Date: Fri, 29 Jun 2012 00:06:18 +0000 Subject: [PATCH] * dwarf2read.c (ABBREV_HASH_SIZE): Remove enclosing #ifndef/#endif. (struct abbrev_table): Define. (dwarf2_cu): Replace members dwarf2_abbrevs, abbrev_obstack with abbrev_table. (init_cutu_and_read_dies): Update. (abbrev_table_alloc_abbrev): New function. Replaces dwarf_alloc_abbrev. All callers updated. (abbrev_table_add_abbrev): New function. (abbrev_table_lookup_abbrev): New function. Replaces dwarf2_lookup_abbrev. All callers updated. (abbrev_table_read_table): New function. Contents moved here from dwarf2_read_abbrevs. (dwarf2_read_abbrevs): Call it. (abbrev_table_free): New function. (dwarf2_free_abbrev_table): Call it. --- gdb/ChangeLog | 18 +++++ gdb/dwarf2read.c | 217 +++++++++++++++++++++++++++++++++++-------------------- 2 files changed, 155 insertions(+), 80 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 0239a30..3a619ff 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,21 @@ +2012-06-28 Doug Evans + + * dwarf2read.c (ABBREV_HASH_SIZE): Remove enclosing #ifndef/#endif. + (struct abbrev_table): Define. + (dwarf2_cu): Replace members dwarf2_abbrevs, abbrev_obstack with + abbrev_table. + (init_cutu_and_read_dies): Update. + (abbrev_table_alloc_abbrev): New function. Replaces + dwarf_alloc_abbrev. All callers updated. + (abbrev_table_add_abbrev): New function. + (abbrev_table_lookup_abbrev): New function. Replaces + dwarf2_lookup_abbrev. All callers updated. + (abbrev_table_read_table): New function. Contents moved here from + dwarf2_read_abbrevs. + (dwarf2_read_abbrevs): Call it. + (abbrev_table_free): New function. + (dwarf2_free_abbrev_table): Call it. + 2012-06-28 Stan Shebs * osdata.c (info_osdata_command): Filter out "Title" columns diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c index 4744107..e3b3963 100644 --- a/gdb/dwarf2read.c +++ b/gdb/dwarf2read.c @@ -310,11 +310,6 @@ dwo_section_names = /* 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 @@ -395,11 +390,10 @@ struct dwarf2_cu distinguish these in buildsym.c. */ struct pending **list_in_scope; - /* DWARF abbreviation table associated with this compilation unit. */ - struct abbrev_info **dwarf2_abbrevs; - - /* Storage for the abbrev table. */ - struct obstack abbrev_obstack; + /* The abbrev table for this CU. + Normally this points to the abbrev table in the objfile. + But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */ + struct abbrev_table *abbrev_table; /* Hash table holding all the loaded partial DIEs with partial_die->offset.SECT_OFF as hash. */ @@ -801,6 +795,27 @@ struct attr_abbrev ENUM_BITFIELD(dwarf_form) form : 16; }; +/* Size of abbrev_table.abbrev_hash_table. */ +#define ABBREV_HASH_SIZE 121 + +/* Top level data structure to contain an abbreviation table. */ + +struct abbrev_table +{ + /* Where the abbrev table came from. */ + struct dwarf2_section_info *section; + sect_offset offset; + + /* Storage for the abbrev table. */ + struct obstack abbrev_obstack; + + /* Hash table of abbrevs. + This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack. + It could be statically allocated, but the previous code didn't so we + don't either. */ + struct abbrev_info **abbrevs; +}; + /* Attributes have a name and a value. */ struct attribute { @@ -1080,6 +1095,14 @@ static void dwarf2_psymtab_to_symtab (struct partial_symtab *); static void psymtab_to_symtab_1 (struct partial_symtab *); +static struct abbrev_info *abbrev_table_lookup_abbrev + (const struct abbrev_table *, unsigned int); + +static struct abbrev_table *abbrev_table_read_table + (struct dwarf2_section_info *, sect_offset); + +static void abbrev_table_free (struct abbrev_table *); + static void dwarf2_read_abbrevs (struct dwarf2_cu *, struct dwarf2_section_info *); @@ -1087,12 +1110,6 @@ static void dwarf2_free_abbrev_table (void *); static unsigned int peek_abbrev_code (bfd *, gdb_byte *); -static struct abbrev_info *peek_die_abbrev (gdb_byte *, unsigned int *, - struct dwarf2_cu *); - -static struct abbrev_info *dwarf2_lookup_abbrev (unsigned int, - struct dwarf2_cu *); - static struct partial_die_info *load_partial_dies (const struct die_reader_specs *, gdb_byte *, int); @@ -1373,8 +1390,6 @@ static void read_signatured_type (struct signatured_type *); static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *); -static struct abbrev_info *dwarf_alloc_abbrev (struct dwarf2_cu *); - static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int); static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, @@ -3951,8 +3966,10 @@ init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu, return; } - /* Read the abbrevs for this compilation unit into a table. */ - if (cu->dwarf2_abbrevs == NULL) + /* If we don't have them yet, read the abbrevs for this compilation unit. + And if we need to read them now, make sure they're freed when we're + done. */ + if (cu->abbrev_table == NULL) { dwarf2_read_abbrevs (cu, abbrev_section); make_cleanup (dwarf2_free_abbrev_table, cu); @@ -5168,7 +5185,7 @@ peek_die_abbrev (gdb_byte *info_ptr, unsigned int *bytes_read, if (abbrev_number == 0) return NULL; - abbrev = dwarf2_lookup_abbrev (abbrev_number, cu); + abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number); if (!abbrev) { error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"), @@ -10923,7 +10940,7 @@ read_full_die_1 (const struct die_reader_specs *reader, return info_ptr; } - abbrev = dwarf2_lookup_abbrev (abbrev_number, cu); + abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number); if (!abbrev) error (_("Dwarf Error: could not find abbrev number %d [in module %s]"), abbrev_number, @@ -10960,37 +10977,89 @@ read_full_die (const struct die_reader_specs *reader, { return read_full_die_1 (reader, diep, info_ptr, has_children, 0); } + +/* Abbreviation tables. -/* In DWARF version 2, the description of the debugging information is + In DWARF version 2, the description of the debugging information is stored in a separate .debug_abbrev section. Before we read any dies from a section we read in all abbreviations and install them - in a hash table. This function also sets flags in CU describing - the data found in the abbrev table. */ + in a hash table. */ + +/* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */ + +static struct abbrev_info * +abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table) +{ + struct abbrev_info *abbrev; + + abbrev = (struct abbrev_info *) + obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info)); + memset (abbrev, 0, sizeof (struct abbrev_info)); + return abbrev; +} + +/* Add an abbreviation to the table. */ static void -dwarf2_read_abbrevs (struct dwarf2_cu *cu, - struct dwarf2_section_info *abbrev_section) +abbrev_table_add_abbrev (struct abbrev_table *abbrev_table, + unsigned int abbrev_number, + struct abbrev_info *abbrev) +{ + unsigned int hash_number; + + hash_number = abbrev_number % ABBREV_HASH_SIZE; + abbrev->next = abbrev_table->abbrevs[hash_number]; + abbrev_table->abbrevs[hash_number] = abbrev; +} +/* Look up an abbrev in the table. + Returns NULL if the abbrev is not found. */ + +static struct abbrev_info * +abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table, + unsigned int abbrev_number) { - bfd *abfd = abbrev_section->asection->owner; - struct comp_unit_head *cu_header = &cu->header; + unsigned int hash_number; + struct abbrev_info *abbrev; + + hash_number = abbrev_number % ABBREV_HASH_SIZE; + abbrev = abbrev_table->abbrevs[hash_number]; + + while (abbrev) + { + if (abbrev->number == abbrev_number) + return abbrev; + abbrev = abbrev->next; + } + return NULL; +} + +/* Read in an abbrev table. */ + +static struct abbrev_table * +abbrev_table_read_table (struct dwarf2_section_info *section, + sect_offset offset) +{ + struct objfile *objfile = dwarf2_per_objfile->objfile; + bfd *abfd = section->asection->owner; + struct abbrev_table *abbrev_table; gdb_byte *abbrev_ptr; struct abbrev_info *cur_abbrev; unsigned int abbrev_number, bytes_read, abbrev_name; - unsigned int abbrev_form, hash_number; + unsigned int abbrev_form; struct attr_abbrev *cur_attrs; unsigned int allocated_attrs; - /* Initialize dwarf2 abbrevs. */ - obstack_init (&cu->abbrev_obstack); - cu->dwarf2_abbrevs = obstack_alloc (&cu->abbrev_obstack, - (ABBREV_HASH_SIZE - * sizeof (struct abbrev_info *))); - memset (cu->dwarf2_abbrevs, 0, - ABBREV_HASH_SIZE * sizeof (struct abbrev_info *)); + abbrev_table = XMALLOC (struct abbrev_table); + obstack_init (&abbrev_table->abbrev_obstack); + abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack, + (ABBREV_HASH_SIZE + * sizeof (struct abbrev_info *))); + memset (abbrev_table->abbrevs, 0, + ABBREV_HASH_SIZE * sizeof (struct abbrev_info *)); - dwarf2_read_section (cu->objfile, abbrev_section); - abbrev_ptr = abbrev_section->buffer + cu_header->abbrev_offset.sect_off; + dwarf2_read_section (objfile, section); + abbrev_ptr = section->buffer + offset.sect_off; abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); abbrev_ptr += bytes_read; @@ -11000,7 +11069,7 @@ dwarf2_read_abbrevs (struct dwarf2_cu *cu, /* Loop until we reach an abbrev number of 0. */ while (abbrev_number) { - cur_abbrev = dwarf_alloc_abbrev (cu); + cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table); /* read in abbrev header */ cur_abbrev->number = abbrev_number; @@ -11032,15 +11101,13 @@ dwarf2_read_abbrevs (struct dwarf2_cu *cu, abbrev_ptr += bytes_read; } - cur_abbrev->attrs = obstack_alloc (&cu->abbrev_obstack, + cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack, (cur_abbrev->num_attrs * sizeof (struct attr_abbrev))); memcpy (cur_abbrev->attrs, cur_attrs, cur_abbrev->num_attrs * sizeof (struct attr_abbrev)); - hash_number = abbrev_number % ABBREV_HASH_SIZE; - cur_abbrev->next = cu->dwarf2_abbrevs[hash_number]; - cu->dwarf2_abbrevs[hash_number] = cur_abbrev; + abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev); /* Get next abbreviation. Under Irix6 the abbreviations for a compilation unit are not @@ -11049,50 +11116,51 @@ dwarf2_read_abbrevs (struct dwarf2_cu *cu, already read (which means we are about to read the abbreviations for the next compile unit) or if the end of the abbreviation table is reached. */ - if ((unsigned int) (abbrev_ptr - abbrev_section->buffer) - >= abbrev_section->size) + if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size) break; abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); abbrev_ptr += bytes_read; - if (dwarf2_lookup_abbrev (abbrev_number, cu) != NULL) + if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL) break; } xfree (cur_attrs); + return abbrev_table; } -/* Release the memory used by the abbrev table for a compilation unit. */ +/* Free the resources held by ABBREV_TABLE. */ static void -dwarf2_free_abbrev_table (void *ptr_to_cu) +abbrev_table_free (struct abbrev_table *abbrev_table) { - struct dwarf2_cu *cu = ptr_to_cu; - - obstack_free (&cu->abbrev_obstack, NULL); - cu->dwarf2_abbrevs = NULL; + obstack_free (&abbrev_table->abbrev_obstack, NULL); + xfree (abbrev_table); } -/* Lookup an abbrev_info structure in the abbrev hash table. */ +/* Read the abbrev table for CU from ABBREV_SECTION. */ + +static void +dwarf2_read_abbrevs (struct dwarf2_cu *cu, + struct dwarf2_section_info *abbrev_section) -static struct abbrev_info * -dwarf2_lookup_abbrev (unsigned int number, struct dwarf2_cu *cu) { - unsigned int hash_number; - struct abbrev_info *abbrev; + cu->abbrev_table = + abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset); +} - hash_number = number % ABBREV_HASH_SIZE; - abbrev = cu->dwarf2_abbrevs[hash_number]; +/* Release the memory used by the abbrev table for a compilation unit. */ - while (abbrev) - { - if (abbrev->number == number) - return abbrev; - else - abbrev = abbrev->next; - } - return NULL; -} +static void +dwarf2_free_abbrev_table (void *ptr_to_cu) +{ + struct dwarf2_cu *cu = ptr_to_cu; + abbrev_table_free (cu->abbrev_table); + /* Set this to NULL so that we SEGV if we try to read it later, + and also because free_comp_unit verifies this is NULL. */ + cu->abbrev_table = NULL; +} + /* Returns nonzero if TAG represents a type that we might generate a partial symbol for. */ @@ -15736,17 +15804,6 @@ dwarf_alloc_block (struct dwarf2_cu *cu) return (blk); } -static struct abbrev_info * -dwarf_alloc_abbrev (struct dwarf2_cu *cu) -{ - struct abbrev_info *abbrev; - - abbrev = (struct abbrev_info *) - obstack_alloc (&cu->abbrev_obstack, sizeof (struct abbrev_info)); - memset (abbrev, 0, sizeof (struct abbrev_info)); - return (abbrev); -} - static struct die_info * dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs) { -- 2.7.4