--- /dev/null
+/* DWARF 2 support.
+ Copyright 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+
+ Adapted from gdb/dwarf2read.c by Gavin Koch of Cygnus Solutions
+ (gavin@cygnus.com).
+
+ From the dwarf2read.c header:
+ Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
+ Inc. with support from Florida State University (under contract
+ with the Ada Joint Program Office), and Silicon Graphics, Inc.
+ Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
+ based on Fred Fish's (Cygnus Support) implementation of DWARF 1
+ support in dwarfread.c
+
+This file is part of BFD.
+
+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 2 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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libiberty.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "elf/dwarf2.h"
+
+/* The data in the .debug_line statement prologue looks like this. */
+struct line_head
+ {
+ unsigned int total_length;
+ unsigned short version;
+ unsigned int prologue_length;
+ unsigned char minimum_instruction_length;
+ unsigned char default_is_stmt;
+ int line_base;
+ unsigned char line_range;
+ unsigned char opcode_base;
+ unsigned char *standard_opcode_lengths;
+ };
+
+/* Attributes have a name and a value */
+struct attribute
+ {
+ enum dwarf_attribute name;
+ enum dwarf_form form;
+ union
+ {
+ char *str;
+ struct dwarf_block *blk;
+ unsigned int unsnd;
+ int snd;
+ bfd_vma addr;
+ }
+ u;
+ };
+
+/* Get at parts of an attribute structure */
+
+#define DW_STRING(attr) ((attr)->u.str)
+#define DW_UNSND(attr) ((attr)->u.unsnd)
+#define DW_BLOCK(attr) ((attr)->u.blk)
+#define DW_SND(attr) ((attr)->u.snd)
+#define DW_ADDR(attr) ((attr)->u.addr)
+
+/* Blocks are a bunch of untyped bytes. */
+struct dwarf_block
+ {
+ unsigned int size;
+ char *data;
+ };
+
+
+struct dwarf2_debug {
+
+ /* A list of all previously read comp_units. */
+ struct comp_unit* all_comp_units;
+
+ /* The next unread compilation unit within the .debug_info section.
+ Zero indicates that the .debug_info section has not been loaded
+ into a buffer yet.*/
+ char* info_ptr;
+
+ /* Pointer to the end of the .debug_info section memory buffer. */
+ char* info_ptr_end;
+
+ /* Pointer to the .debug_abbrev section loaded into memory. */
+ char* dwarf_abbrev_buffer;
+
+ /* Length of the loaded .debug_abbrev section. */
+ unsigned long dwarf_abbrev_size;
+};
+
+
+/* VERBATUM
+ The following function up to the END VERBATUM mark are
+ copied directly from dwarf2read.c. */
+
+/* read dwarf information from a buffer */
+
+static unsigned int
+read_1_byte (abfd, buf)
+ bfd *abfd;
+ char *buf;
+{
+ return bfd_get_8 (abfd, (bfd_byte *) buf);
+}
+
+static int
+read_1_signed_byte (abfd, buf)
+ bfd *abfd;
+ char *buf;
+{
+ return bfd_get_signed_8 (abfd, (bfd_byte *) buf);
+}
+
+static unsigned int
+read_2_bytes (abfd, buf)
+ bfd *abfd;
+ char *buf;
+{
+ return bfd_get_16 (abfd, (bfd_byte *) buf);
+}
+
+#if 0
+
+/* This is not used. */
+
+static int
+read_2_signed_bytes (abfd, buf)
+ bfd *abfd;
+ char *buf;
+{
+ return bfd_get_signed_16 (abfd, (bfd_byte *) buf);
+}
+
+#endif
+
+static unsigned int
+read_4_bytes (abfd, buf)
+ bfd *abfd;
+ char *buf;
+{
+ return bfd_get_32 (abfd, (bfd_byte *) buf);
+}
+
+#if 0
+
+/* This is not used. */
+
+static int
+read_4_signed_bytes (abfd, buf)
+ bfd *abfd;
+ char *buf;
+{
+ return bfd_get_signed_32 (abfd, (bfd_byte *) buf);
+}
+
+#endif
+
+static unsigned int
+read_8_bytes (abfd, buf)
+ bfd *abfd;
+ char *buf;
+{
+ return bfd_get_64 (abfd, (bfd_byte *) buf);
+}
+
+static char *
+read_n_bytes (abfd, buf, size)
+ bfd * abfd;
+ char *buf;
+ unsigned int size;
+{
+ /* If the size of a host char is 8 bits, we can return a pointer
+ to the buffer, otherwise we have to copy the data to a buffer
+ allocated on the temporary obstack. */
+ return buf;
+}
+
+static char *
+read_string (abfd, buf, bytes_read_ptr)
+ bfd *abfd;
+ char *buf;
+ unsigned int *bytes_read_ptr;
+{
+ /* If the size of a host char is 8 bits, we can return a pointer
+ to the string, otherwise we have to copy the string to a buffer
+ allocated on the temporary obstack. */
+ if (*buf == '\0')
+ {
+ *bytes_read_ptr = 1;
+ return NULL;
+ }
+ *bytes_read_ptr = strlen (buf) + 1;
+ return buf;
+}
+
+static unsigned int
+read_unsigned_leb128 (abfd, buf, bytes_read_ptr)
+ bfd *abfd;
+ char *buf;
+ unsigned int *bytes_read_ptr;
+{
+ unsigned int result, num_read;
+ int i, shift;
+ unsigned char byte;
+
+ result = 0;
+ shift = 0;
+ num_read = 0;
+ i = 0;
+ while (1)
+ {
+ byte = bfd_get_8 (abfd, (bfd_byte *) buf);
+ buf++;
+ num_read++;
+ result |= ((byte & 127) << shift);
+ if ((byte & 128) == 0)
+ {
+ break;
+ }
+ shift += 7;
+ }
+ *bytes_read_ptr = num_read;
+ return result;
+}
+
+static int
+read_signed_leb128 (abfd, buf, bytes_read_ptr)
+ bfd *abfd;
+ char *buf;
+ unsigned int *bytes_read_ptr;
+{
+ int result;
+ int i, shift, size, num_read;
+ unsigned char byte;
+
+ result = 0;
+ shift = 0;
+ size = 32;
+ num_read = 0;
+ i = 0;
+ while (1)
+ {
+ byte = bfd_get_8 (abfd, (bfd_byte *) buf);
+ buf++;
+ num_read++;
+ result |= ((byte & 127) << shift);
+ shift += 7;
+ if ((byte & 128) == 0)
+ {
+ break;
+ }
+ }
+ if ((shift < size) && (byte & 0x40))
+ {
+ result |= -(1 << shift);
+ }
+ *bytes_read_ptr = num_read;
+ return result;
+}
+
+/* END VERBATUM */
+
+
+static bfd_vma
+read_address (abfd, buf)
+ bfd *abfd;
+ char *buf;
+{
+ bfd_vma retval = 0;
+
+ if (sizeof(retval) == 4)
+ {
+ retval = bfd_get_32 (abfd, (bfd_byte *) buf);
+ } else {
+ retval = bfd_get_64 (abfd, (bfd_byte *) buf);
+ }
+ return retval;
+}
+
+
+
+
+
+/* This data structure holds the information of an abbrev. */
+struct abbrev_info
+ {
+ unsigned int number; /* number identifying abbrev */
+ enum dwarf_tag tag; /* dwarf tag */
+ int has_children; /* boolean */
+ unsigned int num_attrs; /* number of attributes */
+ struct attr_abbrev *attrs; /* an array of attribute descriptions */
+ struct abbrev_info *next; /* next in chain */
+ };
+
+struct attr_abbrev
+ {
+ enum dwarf_attribute name;
+ enum dwarf_form form;
+ };
+
+#ifndef ABBREV_HASH_SIZE
+#define ABBREV_HASH_SIZE 121
+#endif
+#ifndef ATTR_ALLOC_CHUNK
+#define ATTR_ALLOC_CHUNK 4
+#endif
+
+/* Lookup an abbrev_info structure in the abbrev hash table. */
+
+static struct abbrev_info *
+lookup_abbrev (number,abbrevs)
+ unsigned int number;
+ struct abbrev_info **abbrevs;
+{
+ unsigned int hash_number;
+ struct abbrev_info *abbrev;
+
+ hash_number = number % ABBREV_HASH_SIZE;
+ abbrev = abbrevs[hash_number];
+
+ while (abbrev)
+ {
+ if (abbrev->number == number)
+ return abbrev;
+ else
+ abbrev = abbrev->next;
+ }
+ return NULL;
+}
+
+/* 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. */
+
+static struct abbrev_info**
+read_abbrevs (abfd, offset)
+ bfd * abfd;
+ unsigned int offset;
+{
+ struct abbrev_info **abbrevs;
+ char *abbrev_ptr;
+ struct abbrev_info *cur_abbrev;
+ unsigned int abbrev_number, bytes_read, abbrev_name;
+ unsigned int abbrev_form, hash_number;
+ struct dwarf2_debug *stash;
+
+ stash = elf_tdata(abfd)->dwarf2_find_line_info;
+
+ if (! stash->dwarf_abbrev_buffer)
+ {
+ asection *msec;
+
+ msec = bfd_get_section_by_name (abfd, ".debug_abbrev");
+ if (! msec)
+ {
+ (*_bfd_error_handler) ("Dwarf Error: Can't find .debug_abbrev section.");
+ bfd_set_error (bfd_error_bad_value);
+ return 0;
+ }
+
+ stash->dwarf_abbrev_size = bfd_get_section_size_before_reloc (msec);
+ stash->dwarf_abbrev_buffer = (unsigned char*) bfd_alloc (abfd, stash->dwarf_abbrev_size);
+ if (! stash->dwarf_abbrev_buffer)
+ return 0;
+
+ if (! bfd_get_section_contents (abfd, msec,
+ stash->dwarf_abbrev_buffer, 0,
+ stash->dwarf_abbrev_size))
+ return 0;
+ }
+
+ if (offset > stash->dwarf_abbrev_size)
+ {
+ (*_bfd_error_handler) ("Dwarf Error: Abbrev offset (%u) bigger than abbrev size (%u).",
+ offset, stash->dwarf_abbrev_size );
+ bfd_set_error (bfd_error_bad_value);
+ return 0;
+ }
+
+ abbrevs = (struct abbrev_info**) bfd_zalloc (abfd, sizeof(struct abbrev_info*) * ABBREV_HASH_SIZE);
+
+ abbrev_ptr = stash->dwarf_abbrev_buffer + offset;
+ abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
+ abbrev_ptr += bytes_read;
+
+ /* loop until we reach an abbrev number of 0 */
+ while (abbrev_number)
+ {
+ cur_abbrev = (struct abbrev_info*)bfd_zalloc (abfd, sizeof (struct abbrev_info));
+
+ /* read in abbrev header */
+ cur_abbrev->number = abbrev_number;
+ cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
+ abbrev_ptr += bytes_read;
+ cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
+ abbrev_ptr += 1;
+
+ /* now read in declarations */
+ abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
+ abbrev_ptr += bytes_read;
+ abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
+ abbrev_ptr += bytes_read;
+ while (abbrev_name)
+ {
+ if ((cur_abbrev->num_attrs % ATTR_ALLOC_CHUNK) == 0)
+ {
+ cur_abbrev->attrs = (struct attr_abbrev *)
+ bfd_realloc (cur_abbrev->attrs,
+ (cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK)
+ * sizeof (struct attr_abbrev));
+ if (! cur_abbrev->attrs)
+ return 0;
+ }
+ cur_abbrev->attrs[cur_abbrev->num_attrs].name = abbrev_name;
+ cur_abbrev->attrs[cur_abbrev->num_attrs++].form = abbrev_form;
+ abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
+ abbrev_ptr += bytes_read;
+ abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
+ abbrev_ptr += bytes_read;
+ }
+
+ hash_number = abbrev_number % ABBREV_HASH_SIZE;
+ cur_abbrev->next = abbrevs[hash_number];
+ abbrevs[hash_number] = cur_abbrev;
+
+ /* Get next abbreviation.
+ Under Irix6 the abbreviations for a compilation unit are not
+ always properly terminated with an abbrev number of 0.
+ Exit loop if we encounter an abbreviation which we have
+ 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 - stash->dwarf_abbrev_buffer)
+ >= stash->dwarf_abbrev_size)
+ break;
+ abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
+ abbrev_ptr += bytes_read;
+ if (lookup_abbrev (abbrev_number,abbrevs) != NULL)
+ break;
+ }
+
+ return abbrevs;
+}
+
+/* Read an attribute described by an abbreviated attribute. */
+
+static char *
+read_attribute (attr, abbrev, abfd, info_ptr)
+ struct attribute *attr;
+ struct attr_abbrev *abbrev;
+ bfd *abfd;
+ char *info_ptr;
+{
+ unsigned int bytes_read;
+ struct dwarf_block *blk;
+
+ attr->name = abbrev->name;
+ attr->form = abbrev->form;
+ switch (abbrev->form)
+ {
+ case DW_FORM_addr:
+ case DW_FORM_ref_addr:
+ DW_ADDR (attr) = read_address (abfd, info_ptr);
+ info_ptr += sizeof(bfd_vma);
+ break;
+ case DW_FORM_block2:
+ blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block));
+ blk->size = read_2_bytes (abfd, info_ptr);
+ info_ptr += 2;
+ blk->data = read_n_bytes (abfd, info_ptr, blk->size);
+ info_ptr += blk->size;
+ DW_BLOCK (attr) = blk;
+ break;
+ case DW_FORM_block4:
+ blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block));
+ blk->size = read_4_bytes (abfd, info_ptr);
+ info_ptr += 4;
+ blk->data = read_n_bytes (abfd, info_ptr, blk->size);
+ info_ptr += blk->size;
+ DW_BLOCK (attr) = blk;
+ break;
+ case DW_FORM_data2:
+ DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
+ info_ptr += 2;
+ break;
+ case DW_FORM_data4:
+ DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
+ info_ptr += 4;
+ break;
+ case DW_FORM_data8:
+ DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
+ info_ptr += 8;
+ break;
+ case DW_FORM_string:
+ DW_STRING (attr) = read_string (abfd, info_ptr, &bytes_read);
+ info_ptr += bytes_read;
+ break;
+ case DW_FORM_block:
+ blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block));
+ blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
+ info_ptr += bytes_read;
+ blk->data = read_n_bytes (abfd, info_ptr, blk->size);
+ info_ptr += blk->size;
+ DW_BLOCK (attr) = blk;
+ break;
+ case DW_FORM_block1:
+ blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block));
+ blk->size = read_1_byte (abfd, info_ptr);
+ info_ptr += 1;
+ blk->data = read_n_bytes (abfd, info_ptr, blk->size);
+ info_ptr += blk->size;
+ DW_BLOCK (attr) = blk;
+ break;
+ case DW_FORM_data1:
+ DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
+ info_ptr += 1;
+ break;
+ case DW_FORM_flag:
+ DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
+ info_ptr += 1;
+ break;
+ case DW_FORM_sdata:
+ DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
+ info_ptr += bytes_read;
+ break;
+ case DW_FORM_udata:
+ DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
+ info_ptr += bytes_read;
+ break;
+ case DW_FORM_ref1:
+ DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
+ info_ptr += 1;
+ break;
+ case DW_FORM_ref2:
+ DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
+ info_ptr += 2;
+ break;
+ case DW_FORM_ref4:
+ DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
+ info_ptr += 4;
+ break;
+ case DW_FORM_ref_udata:
+ DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
+ info_ptr += bytes_read;
+ break;
+ case DW_FORM_strp:
+ case DW_FORM_indirect:
+ default:
+ (*_bfd_error_handler) ("Dwarf Error: Invalid or unhandled FORM value: %d.",
+ abbrev->form);
+ bfd_set_error (bfd_error_bad_value);
+ }
+ return info_ptr;
+}
+
+
+/* Source line information table routines. */
+
+#define FILE_ALLOC_CHUNK 5
+#define DIR_ALLOC_CHUNK 5
+
+struct line_info {
+ struct line_info* prev_line;
+
+ bfd_vma address;
+ char* filename;
+ unsigned int line;
+ unsigned int column;
+};
+
+struct fileinfo {
+ char *name;
+ unsigned int dir;
+ unsigned int time;
+ unsigned int size;
+};
+
+struct line_info_table {
+ bfd* abfd;
+
+ unsigned int num_files;
+ unsigned int num_dirs;
+
+ char* comp_dir;
+ char** dirs;
+ struct fileinfo* files;
+ struct line_info* last_line;
+};
+
+static void
+add_line_info (table, address, filename, line, column)
+ struct line_info_table* table;
+ bfd_vma address;
+ char* filename;
+ unsigned int line;
+ unsigned int column;
+{
+ struct line_info* info = (struct line_info*)
+ bfd_alloc (table->abfd, sizeof (struct line_info));
+
+ info->prev_line = table->last_line;
+ table->last_line = info;
+
+ info->address = address;
+ info->filename = filename;
+ info->line = line;
+ info->column = column;
+}
+
+static char*
+concat_filename (table, file)
+ struct line_info_table* table;
+ unsigned int file;
+{
+ char* filename = table->files[file - 1].name;
+ if (*filename == '/')
+ return filename;
+
+ else
+ {
+ char* dirname = (table->files[file - 1].dir
+ ? table->dirs[table->files[file - 1].dir - 1]
+ : table->comp_dir);
+ return (char*) concat (dirname, "/", filename, NULL);
+ }
+}
+
+/* Decode the line number information for the compilation unit whose
+ line number info is at OFFSET in the .debug_line section.
+ The compilation directory of the file is passed in COMP_DIR. */
+
+static struct line_info_table*
+decode_line_info (abfd, offset, comp_dir)
+ bfd *abfd;
+ unsigned int offset;
+ char *comp_dir;
+{
+ static char* dwarf_line_buffer = 0;
+
+ struct line_info_table* table;
+
+ char *line_ptr;
+ char *line_end;
+ struct line_head lh;
+ unsigned int i, bytes_read;
+ char *cur_file, *cur_dir;
+ unsigned char op_code, extended_op, adj_opcode;
+
+ if (! dwarf_line_buffer)
+ {
+ asection *msec;
+ unsigned long size;
+
+ msec = bfd_get_section_by_name (abfd, ".debug_line");
+ if (! msec)
+ {
+ (*_bfd_error_handler) ("Dwarf Error: Can't find .debug_line section.");
+ bfd_set_error (bfd_error_bad_value);
+ return 0;
+ }
+
+ size = bfd_get_section_size_before_reloc (msec);
+ dwarf_line_buffer = (unsigned char*) bfd_alloc (abfd, size);
+ if (! dwarf_line_buffer)
+ return 0;
+
+ if (! bfd_get_section_contents (abfd, msec,
+ dwarf_line_buffer, 0,
+ size))
+ return 0;
+ }
+
+ table = (struct line_info_table*) bfd_alloc (abfd,
+ sizeof (struct line_info_table));
+ table->abfd = abfd;
+ table->comp_dir = comp_dir;
+
+ table->num_files = 0;
+ table->files = NULL;
+
+ table->num_dirs = 0;
+ table->dirs = NULL;
+
+ line_ptr = dwarf_line_buffer + offset;
+
+ /* read in the prologue */
+ lh.total_length = read_4_bytes (abfd, line_ptr);
+ line_ptr += 4;
+ line_end = line_ptr + lh.total_length;
+ lh.version = read_2_bytes (abfd, line_ptr);
+ line_ptr += 2;
+ lh.prologue_length = read_4_bytes (abfd, line_ptr);
+ line_ptr += 4;
+ lh.minimum_instruction_length = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh.default_is_stmt = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh.line_base = read_1_signed_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh.line_range = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh.opcode_base = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh.standard_opcode_lengths = (unsigned char *)
+ bfd_alloc (abfd, lh.opcode_base * sizeof (unsigned char));
+
+ lh.standard_opcode_lengths[0] = 1;
+ for (i = 1; i < lh.opcode_base; ++i)
+ {
+ lh.standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ }
+
+ /* Read directory table */
+ while ((cur_dir = read_string (abfd, line_ptr, &bytes_read)) != NULL)
+ {
+ line_ptr += bytes_read;
+ if ((table->num_dirs % DIR_ALLOC_CHUNK) == 0)
+ {
+ table->dirs = (char **)
+ bfd_realloc (table->dirs,
+ (table->num_dirs + DIR_ALLOC_CHUNK) * sizeof (char *));
+ if (! table->dirs)
+ return 0;
+ }
+ table->dirs[table->num_dirs++] = cur_dir;
+ }
+ line_ptr += bytes_read;
+
+ /* Read file name table */
+ while ((cur_file = read_string (abfd, line_ptr, &bytes_read)) != NULL)
+ {
+ line_ptr += bytes_read;
+ if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
+ {
+ table->files = (struct fileinfo *)
+ bfd_realloc (table->files,
+ (table->num_files + FILE_ALLOC_CHUNK)
+ * sizeof (struct fileinfo));
+ if (! table->files)
+ return 0;
+ }
+ table->files[table->num_files].name = cur_file;
+ table->files[table->num_files].dir =
+ read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ table->files[table->num_files].time =
+ read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ table->files[table->num_files].size =
+ read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ table->num_files++;
+ }
+ line_ptr += bytes_read;
+
+ /* Read the statement sequences until there's nothing left. */
+ while (line_ptr < line_end)
+ {
+ /* state machine registers */
+ bfd_vma address = 0;
+ char* filename = concat_filename (table, 1);
+ unsigned int line = 1;
+ unsigned int column = 0;
+ int is_stmt = lh.default_is_stmt;
+ int basic_block = 0;
+ int end_sequence = 0;
+
+ /* Decode the table. */
+ while (! end_sequence)
+ {
+ op_code = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ switch (op_code)
+ {
+ case DW_LNS_extended_op:
+ line_ptr += 1; /* ignore length */
+ extended_op = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ switch (extended_op)
+ {
+ case DW_LNE_end_sequence:
+ end_sequence = 1;
+ add_line_info (table, address, filename, line, column);
+ break;
+ case DW_LNE_set_address:
+ address = read_address (abfd, line_ptr);
+ address &= 0xffffffff;
+ line_ptr += sizeof (bfd_vma);
+ break;
+ case DW_LNE_define_file:
+ cur_file = read_string (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
+ {
+ table->files = (struct fileinfo *)
+ bfd_realloc (table->files,
+ (table->num_files + FILE_ALLOC_CHUNK)
+ * sizeof (struct fileinfo));
+ if (! table->files)
+ return 0;
+ }
+ table->files[table->num_files].name = cur_file;
+ table->files[table->num_files].dir =
+ read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ table->files[table->num_files].time =
+ read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ table->files[table->num_files].size =
+ read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ table->num_files++;
+ break;
+ default:
+ (*_bfd_error_handler) ("Dwarf Error: mangled line number section.");
+ bfd_set_error (bfd_error_bad_value);
+ return 0;
+ }
+ break;
+ case DW_LNS_copy:
+ add_line_info (table, address, filename, line, column);
+ basic_block = 0;
+ break;
+ case DW_LNS_advance_pc:
+ address += lh.minimum_instruction_length
+ * read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ break;
+ case DW_LNS_advance_line:
+ line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ break;
+ case DW_LNS_set_file:
+ {
+ unsigned int file;
+
+ /* The file and directory tables are 0 based, the references
+ are 1 based. */
+ file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ filename = concat_filename (table, file);
+ break;
+ }
+ case DW_LNS_set_column:
+ column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ break;
+ case DW_LNS_negate_stmt:
+ is_stmt = (!is_stmt);
+ break;
+ case DW_LNS_set_basic_block:
+ basic_block = 1;
+ break;
+ case DW_LNS_const_add_pc:
+ address += (255 - lh.opcode_base) / lh.line_range;
+ break;
+ case DW_LNS_fixed_advance_pc:
+ address += read_2_bytes (abfd, line_ptr);
+ line_ptr += 2;
+ break;
+ default: /* special operand */
+ adj_opcode = op_code - lh.opcode_base;
+ address += (adj_opcode / lh.line_range)
+ * lh.minimum_instruction_length;
+ line += lh.line_base + (adj_opcode % lh.line_range);
+ /* append row to matrix using current values */
+ add_line_info (table, address, filename, line, column);
+ basic_block = 1;
+ }
+ }
+ }
+
+ return table;
+}
+
+
+/* If ADDR is within TABLE set the output parameters and return true,
+ otherwise return false. The output parameters, FILENAME_PTR and
+ LINENUMBER_PTR, are pointers to the objects to be filled in. */
+
+static boolean
+lookup_address_in_line_info_table (table,
+ addr,
+ filename_ptr,
+ linenumber_ptr)
+ struct line_info_table* table;
+ bfd_vma addr;
+ const char **filename_ptr;
+ unsigned int *linenumber_ptr;
+{
+ struct line_info* each_line;
+ struct line_info* next_line;
+
+ for (next_line = 0, each_line = table->last_line;
+ each_line;
+ next_line = each_line, each_line = each_line->prev_line)
+ {
+ if (addr >= each_line->address
+ && (next_line == 0
+ || addr < next_line->address))
+ {
+ *filename_ptr = each_line->filename;
+ *linenumber_ptr = each_line->line;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+
+
+
+/* Function table functions. */
+
+struct funcinfo {
+ struct funcinfo *prev_func;
+
+ char* name;
+ bfd_vma low;
+ bfd_vma high;
+};
+
+
+/* If ADDR is within TABLE, set FUNCTIONNAME_PTR, and return true. */
+
+static boolean
+lookup_address_in_function_table (table,
+ addr,
+ functionname_ptr)
+ struct funcinfo* table;
+ bfd_vma addr;
+ const char **functionname_ptr;
+{
+ struct funcinfo* each_func;
+
+ for (each_func = table;
+ each_func;
+ each_func = each_func->prev_func)
+ {
+ if (addr >= (each_func->low & 0xffffffff)
+ && addr < (each_func->high & 0xffffffff))
+ {
+ *functionname_ptr = each_func->name;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+
+
+
+/* DWARF2 Compilation unit functions. */
+
+
+/* A minimal decoding of DWARF2 compilation units. We only decode
+ what's needed to get to the line number information. */
+
+struct comp_unit {
+
+ /* Chain the previously read compilation units. */
+ struct comp_unit* next_unit;
+
+ /* Keep the bdf convenient (for memory allocation). */
+ bfd* abfd;
+
+ /* The lowest and higest addresses contained in this compilation
+ unit as specified in the compilation unit header. */
+ bfd_vma low;
+ bfd_vma high;
+
+ /* The DW_AT_name attribute (for error messages). */
+ char* name;
+
+ /* The abbrev hash table. */
+ struct abbrev_info** abbrevs;
+
+ /* Note that an error was found by comp_unit_find_nearest_line. */
+ int error;
+
+ /* The DW_AT_comp_dir attribute */
+ char* comp_dir;
+
+ /* True if there is a line number table associated with this comp. unit. */
+ int stmtlist;
+
+ /* The offset into .debug_line of the line number table. */
+ unsigned long line_offset;
+
+ /* Pointer to the first child die for the comp unit. */
+ char *first_child_die_ptr;
+
+ /* The end of the comp unit. */
+ char *end_ptr;
+
+ /* The decoded line number, NULL if not yet decoded. */
+ struct line_info_table* line_table;
+
+ /* A list of the functions found in this comp. unit. */
+ struct funcinfo* function_table;
+
+};
+
+
+
+/* Scan over each die in a comp. unit looking for functions to add
+ to the function table. */
+
+static boolean
+scan_unit_for_functions (unit)
+ struct comp_unit *unit;
+{
+ bfd *abfd = unit->abfd;
+ char *info_ptr = unit->first_child_die_ptr;
+ int nesting_level = 1;
+
+ while (nesting_level)
+ {
+ unsigned int abbrev_number, bytes_read, i;
+ struct abbrev_info *abbrev;
+ struct attribute attr;
+ struct funcinfo *func;
+ char* name = 0;
+
+ abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
+ info_ptr += bytes_read;
+
+ if (! abbrev_number)
+ {
+ nesting_level--;
+ continue;
+ }
+
+ abbrev = lookup_abbrev (abbrev_number,unit->abbrevs);
+ if (! abbrev)
+ {
+ (*_bfd_error_handler) ("Dwarf Error: Could not find abbrev number %d.",
+ abbrev_number);
+ bfd_set_error (bfd_error_bad_value);
+ return false;
+ }
+
+ if (abbrev->tag == DW_TAG_subprogram)
+ {
+ func = (struct funcinfo*) bfd_zalloc (abfd, sizeof (struct funcinfo));
+ func->prev_func = unit->function_table;
+ unit->function_table = func;
+ }
+ else
+ func = NULL;
+
+ for (i = 0; i < abbrev->num_attrs; ++i)
+ {
+ info_ptr = read_attribute (&attr, &abbrev->attrs[i], abfd, info_ptr);
+
+ if (func)
+ {
+ switch (attr.name)
+ {
+ case DW_AT_name:
+
+ name = DW_STRING (&attr);
+
+ /* Prefer DW_AT_MIPS_linkage_name over DW_AT_name. */
+ if (func->name == NULL)
+ func->name = DW_STRING (&attr);
+ break;
+
+ case DW_AT_MIPS_linkage_name:
+ func->name = DW_STRING (&attr);
+ break;
+
+ case DW_AT_low_pc:
+ func->low = DW_ADDR (&attr);
+ break;
+
+ case DW_AT_high_pc:
+ func->high = DW_ADDR (&attr);
+ break;
+
+ default:
+ break;
+ }
+ }
+ else
+ {
+ switch (attr.name)
+ {
+ case DW_AT_name:
+ name = DW_STRING (&attr);
+ break;
+
+ default:
+ break;
+ }
+ }
+ }
+
+ if (abbrev->has_children)
+ nesting_level++;
+ }
+
+ return true;
+}
+
+
+
+
+
+
+/* Parse a DWARF2 compilation unit starting at INFO_PTR. This includes
+ the compilation unit header that proceeds the DIE's, but does not
+ include the length field that preceeds each compilation unit header.
+ END_PTR points one past the end of this comp unit.
+
+ This routine does not read the whole compilation unit; only enough
+ to get to the line number information for the compilation unit.
+ */
+
+static struct comp_unit*
+parse_comp_unit (abfd, info_ptr, end_ptr)
+ bfd* abfd;
+ char* info_ptr;
+ char* end_ptr;
+{
+ struct comp_unit* unit;
+
+ unsigned short version;
+ unsigned int abbrev_offset;
+ unsigned char addr_size;
+ struct abbrev_info** abbrevs;
+
+ unsigned int abbrev_number, bytes_read, i;
+ struct abbrev_info *abbrev;
+ struct attribute attr;
+
+ version = read_2_bytes (abfd, info_ptr);
+ info_ptr += 2;
+ abbrev_offset = read_4_bytes (abfd, info_ptr);
+ info_ptr += 4;
+ addr_size = read_1_byte (abfd, info_ptr);
+ info_ptr += 1;
+
+ if (version != 2)
+ {
+ (*_bfd_error_handler) ("Dwarf Error: found dwarf version '%hu', this reader only handles version 2 information.", version );
+ bfd_set_error (bfd_error_bad_value);
+ return 0;
+ }
+
+ if (addr_size != sizeof (bfd_vma))
+ {
+ (*_bfd_error_handler) ("Dwarf Error: found address size '%u', this readers only handles address size '%u'.",
+ addr_size,
+ sizeof (bfd_vma));
+ bfd_set_error (bfd_error_bad_value);
+ return 0;
+ }
+
+ /* Read the abbrevs for this compilation unit into a table */
+ abbrevs = read_abbrevs (abfd, abbrev_offset);
+ if (! abbrevs)
+ return 0;
+
+ abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
+ info_ptr += bytes_read;
+ if (! abbrev_number)
+ {
+ (*_bfd_error_handler) ("Dwarf Error: Bad abbrev number: %d.",
+ abbrev_number);
+ bfd_set_error (bfd_error_bad_value);
+ return 0;
+ }
+
+ abbrev = lookup_abbrev (abbrev_number, abbrevs);
+ if (! abbrev)
+ {
+ (*_bfd_error_handler) ("Dwarf Error: Could not find abbrev number %d.",
+ abbrev_number);
+ bfd_set_error (bfd_error_bad_value);
+ return 0;
+ }
+
+ unit = (struct comp_unit*) bfd_zalloc (abfd, sizeof (struct comp_unit));
+ unit->abfd = abfd;
+ unit->abbrevs = abbrevs;
+ unit->end_ptr = end_ptr;
+
+ for (i = 0; i < abbrev->num_attrs; ++i)
+ {
+ info_ptr = read_attribute (&attr, &abbrev->attrs[i], abfd, info_ptr);
+
+ /* Store the data if it is of an attribute we want to keep in a
+ partial symbol table. */
+ switch (attr.name)
+ {
+ case DW_AT_stmt_list:
+ unit->stmtlist = 1;
+ unit->line_offset = DW_UNSND (&attr);
+ break;
+
+ case DW_AT_name:
+ unit->name = DW_STRING (&attr);
+ break;
+
+ case DW_AT_low_pc:
+ unit->low = DW_ADDR (&attr);
+ break;
+
+ case DW_AT_high_pc:
+ unit->high = DW_ADDR (&attr);
+ break;
+
+ case DW_AT_comp_dir:
+ {
+ char* comp_dir = DW_STRING (&attr);
+ if (comp_dir)
+ {
+ /* Irix 6.2 native cc prepends <machine>.: to the compilation
+ directory, get rid of it. */
+ char *cp = (char*) strchr (comp_dir, ':');
+
+ if (cp && cp != comp_dir && cp[-1] == '.' && cp[1] == '/')
+ comp_dir = cp + 1;
+ }
+ unit->comp_dir = comp_dir;
+ break;
+ }
+
+ default:
+ break;
+ }
+ }
+
+ unit->first_child_die_ptr = info_ptr;
+ return unit;
+}
+
+
+
+
+
+/* Return true if UNIT contains the address given by ADDR. */
+
+static boolean
+comp_unit_contains_address (unit, addr)
+ struct comp_unit* unit;
+ bfd_vma addr;
+{
+ return ! unit->error
+ && ( addr >= (unit->low & 0xffffffff)
+ && addr <= (unit->high & 0xffffffff));
+}
+
+
+/* If UNIT contains ADDR, set the output parameters to the values for
+ the line containing ADDR. The output parameters, FILENAME_PTR,
+ FUNCTIONNAME_PTR, and LINENUMBER_PTR, are pointers to the objects
+ to be filled in.
+
+ Return true of UNIT contains ADDR, and no errors were encountered;
+ false otherwise. */
+
+static boolean
+comp_unit_find_nearest_line (unit, addr,
+ filename_ptr, functionname_ptr, linenumber_ptr)
+ struct comp_unit* unit;
+ bfd_vma addr;
+ const char **filename_ptr;
+ const char **functionname_ptr;
+ unsigned int *linenumber_ptr;
+{
+ boolean line_p;
+ boolean func_p;
+
+ if (unit->error)
+ return false;
+
+ if (! unit->line_table)
+ {
+ if (! unit->stmtlist)
+ {
+ unit->error = 1;
+ return false;
+ }
+
+ unit->line_table = decode_line_info (unit->abfd,
+ unit->line_offset,
+ unit->comp_dir);
+
+ if (! unit->line_table)
+ {
+ unit->error = 1;
+ return false;
+ }
+
+ if (! scan_unit_for_functions (unit))
+ {
+ unit->error = 1;
+ return false;
+ }
+ }
+
+ line_p = lookup_address_in_line_info_table (unit->line_table,
+ addr,
+ filename_ptr,
+ linenumber_ptr);
+ func_p = lookup_address_in_function_table (unit->function_table,
+ addr,
+ functionname_ptr);
+ return line_p || func_p;
+}
+
+/* The DWARF2 version of find_nearest line.
+ Return true if the line is found without error. */
+
+boolean
+_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
+ filename_ptr, functionname_ptr, linenumber_ptr)
+ bfd *abfd;
+ asection *section;
+ asymbol **symbols;
+ bfd_vma offset;
+ const char **filename_ptr;
+ const char **functionname_ptr;
+ unsigned int *linenumber_ptr;
+{
+ /* Read each compilation unit from the section .debug_info, and check
+ to see if it contains the address we are searching for. If yes,
+ lookup the address, and return the line number info. If no, go
+ on to the next compilation unit.
+
+ We keep a list of all the previously read compilation units, and
+ a pointer to the next un-read compilation unit. Check the
+ previously read units before reading more.
+ */
+
+ struct dwarf2_debug *stash = elf_tdata (abfd)->dwarf2_find_line_info;
+
+ /* What address are we looking for? */
+ bfd_vma addr = offset + section->vma;
+
+ struct comp_unit* each;
+
+ *filename_ptr = NULL;
+ *functionname_ptr = NULL;
+ *linenumber_ptr = 0;
+
+ if (! stash)
+ {
+ asection *msec;
+ unsigned long size;
+
+ stash = elf_tdata (abfd)->dwarf2_find_line_info =
+ (struct dwarf2_debug*) bfd_zalloc (abfd, sizeof (struct dwarf2_debug));
+
+ if (! stash)
+ return false;
+
+ msec = bfd_get_section_by_name (abfd, ".debug_info");
+ if (! msec)
+ {
+ /* No dwarf2 info. Note that at this point the stash
+ has been allocated, but contains zeros, this lets
+ future calls to this function fail quicker. */
+ return false;
+ }
+
+ size = bfd_get_section_size_before_reloc (msec);
+ stash->info_ptr = (unsigned char*) bfd_alloc (abfd, size);
+
+ if (! stash->info_ptr)
+ return false;
+
+ if (! bfd_get_section_contents (abfd, msec, stash->info_ptr, 0, size))
+ {
+ stash->info_ptr = 0;
+ return false;
+ }
+
+ stash->info_ptr_end = stash->info_ptr + size;
+ }
+
+
+ /* A null info_ptr indicates that there is no dwarf2 info
+ (or that an error occured while setting up the stash). */
+
+ if (! stash->info_ptr)
+ return false;
+
+
+
+ /* Check the previously read comp. units first. */
+
+ for (each = stash->all_comp_units; each; each = each->next_unit)
+ {
+ if (comp_unit_contains_address (each, addr))
+ return comp_unit_find_nearest_line (each, addr,
+ filename_ptr,
+ functionname_ptr,
+ linenumber_ptr);
+ }
+
+
+ /* Read each remaining comp. units checking each as they are read. */
+ while (stash->info_ptr < stash->info_ptr_end)
+ {
+ struct comp_unit* each;
+ unsigned int length;
+
+ length = read_4_bytes (abfd, stash->info_ptr);
+ stash->info_ptr += 4;
+
+ if (length > 0)
+ {
+ each = parse_comp_unit (abfd, stash->info_ptr,
+ stash->info_ptr + length);
+ stash->info_ptr += length;
+
+ if (each)
+ {
+ each->next_unit = stash->all_comp_units;
+ stash->all_comp_units = each;
+
+ if (comp_unit_contains_address (each, addr))
+ return comp_unit_find_nearest_line (each, addr,
+ filename_ptr,
+ functionname_ptr,
+ linenumber_ptr);
+ }
+ }
+ }
+
+ return false;
+}
+
+/* end of file */
projects / thirdparty / binutils-gdb.git / commitdiff
