3228 lines
85 KiB
C
3228 lines
85 KiB
C
/* DWARF 2 support.
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Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
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2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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Adapted from gdb/dwarf2read.c by Gavin Koch of Cygnus Solutions
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(gavin@cygnus.com).
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From the dwarf2read.c header:
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Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
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Inc. with support from Florida State University (under contract
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with the Ada Joint Program Office), and Silicon Graphics, Inc.
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Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
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based on Fred Fish's (Cygnus Support) implementation of DWARF 1
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support in dwarfread.c
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This file is part of BFD.
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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 (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libiberty.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/dwarf2.h"
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/* The data in the .debug_line statement prologue looks like this. */
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struct line_head
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{
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bfd_vma total_length;
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unsigned short version;
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bfd_vma prologue_length;
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unsigned char minimum_instruction_length;
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unsigned char default_is_stmt;
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int line_base;
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unsigned char line_range;
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unsigned char opcode_base;
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unsigned char *standard_opcode_lengths;
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};
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/* Attributes have a name and a value. */
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struct attribute
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{
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enum dwarf_attribute name;
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enum dwarf_form form;
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union
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{
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char *str;
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struct dwarf_block *blk;
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bfd_uint64_t val;
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bfd_int64_t sval;
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}
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u;
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};
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/* Blocks are a bunch of untyped bytes. */
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struct dwarf_block
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{
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unsigned int size;
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bfd_byte *data;
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};
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struct loadable_section
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{
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asection *section;
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bfd_vma adj_vma;
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};
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struct dwarf2_debug
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{
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/* A list of all previously read comp_units. */
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struct comp_unit *all_comp_units;
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/* Last comp unit in list above. */
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struct comp_unit *last_comp_unit;
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/* The next unread compilation unit within the .debug_info section.
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Zero indicates that the .debug_info section has not been loaded
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into a buffer yet. */
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bfd_byte *info_ptr;
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/* Pointer to the end of the .debug_info section memory buffer. */
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bfd_byte *info_ptr_end;
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/* Pointer to the bfd, section and address of the beginning of the
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section. The bfd might be different than expected because of
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gnu_debuglink sections. */
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bfd * bfd;
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asection *sec;
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bfd_byte *sec_info_ptr;
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/* Pointer to the symbol table. */
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asymbol **syms;
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/* Pointer to the .debug_abbrev section loaded into memory. */
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bfd_byte *dwarf_abbrev_buffer;
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/* Length of the loaded .debug_abbrev section. */
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unsigned long dwarf_abbrev_size;
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/* Buffer for decode_line_info. */
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bfd_byte *dwarf_line_buffer;
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/* Length of the loaded .debug_line section. */
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unsigned long dwarf_line_size;
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/* Pointer to the .debug_str section loaded into memory. */
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bfd_byte *dwarf_str_buffer;
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/* Length of the loaded .debug_str section. */
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unsigned long dwarf_str_size;
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/* Pointer to the .debug_ranges section loaded into memory. */
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bfd_byte *dwarf_ranges_buffer;
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/* Length of the loaded .debug_ranges section. */
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unsigned long dwarf_ranges_size;
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/* If the most recent call to bfd_find_nearest_line was given an
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address in an inlined function, preserve a pointer into the
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calling chain for subsequent calls to bfd_find_inliner_info to
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use. */
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struct funcinfo *inliner_chain;
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/* Number of loadable sections. */
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unsigned int loadable_section_count;
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/* Array of loadable sections. */
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struct loadable_section *loadable_sections;
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/* Number of times find_line is called. This is used in
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the heuristic for enabling the info hash tables. */
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int info_hash_count;
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#define STASH_INFO_HASH_TRIGGER 100
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/* Hash table mapping symbol names to function infos. */
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struct info_hash_table *funcinfo_hash_table;
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/* Hash table mapping symbol names to variable infos. */
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struct info_hash_table *varinfo_hash_table;
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/* Head of comp_unit list in the last hash table update. */
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struct comp_unit *hash_units_head;
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/* Status of info hash. */
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int info_hash_status;
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#define STASH_INFO_HASH_OFF 0
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#define STASH_INFO_HASH_ON 1
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#define STASH_INFO_HASH_DISABLED 2
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};
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struct arange
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{
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struct arange *next;
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bfd_vma low;
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bfd_vma high;
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};
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/* A minimal decoding of DWARF2 compilation units. We only decode
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what's needed to get to the line number information. */
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struct comp_unit
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{
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/* Chain the previously read compilation units. */
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struct comp_unit *next_unit;
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/* Likewise, chain the compilation unit read after this one.
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The comp units are stored in reversed reading order. */
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struct comp_unit *prev_unit;
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/* Keep the bfd convenient (for memory allocation). */
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bfd *abfd;
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/* The lowest and highest addresses contained in this compilation
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unit as specified in the compilation unit header. */
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struct arange arange;
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/* The DW_AT_name attribute (for error messages). */
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char *name;
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/* The abbrev hash table. */
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struct abbrev_info **abbrevs;
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/* Note that an error was found by comp_unit_find_nearest_line. */
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int error;
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/* The DW_AT_comp_dir attribute. */
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char *comp_dir;
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/* TRUE if there is a line number table associated with this comp. unit. */
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int stmtlist;
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/* Pointer to the current comp_unit so that we can find a given entry
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by its reference. */
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bfd_byte *info_ptr_unit;
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/* The offset into .debug_line of the line number table. */
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unsigned long line_offset;
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/* Pointer to the first child die for the comp unit. */
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bfd_byte *first_child_die_ptr;
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/* The end of the comp unit. */
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bfd_byte *end_ptr;
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/* The decoded line number, NULL if not yet decoded. */
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struct line_info_table *line_table;
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/* A list of the functions found in this comp. unit. */
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struct funcinfo *function_table;
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/* A list of the variables found in this comp. unit. */
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struct varinfo *variable_table;
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/* Pointer to dwarf2_debug structure. */
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struct dwarf2_debug *stash;
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/* Address size for this unit - from unit header. */
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unsigned char addr_size;
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/* Offset size for this unit - from unit header. */
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unsigned char offset_size;
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/* Base address for this unit - from DW_AT_low_pc attribute of
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DW_TAG_compile_unit DIE */
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bfd_vma base_address;
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/* TRUE if symbols are cached in hash table for faster lookup by name. */
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bfd_boolean cached;
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};
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/* This data structure holds the information of an abbrev. */
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struct abbrev_info
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{
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unsigned int number; /* Number identifying abbrev. */
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enum dwarf_tag tag; /* DWARF tag. */
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int has_children; /* Boolean. */
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unsigned int num_attrs; /* Number of attributes. */
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struct attr_abbrev *attrs; /* An array of attribute descriptions. */
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struct abbrev_info *next; /* Next in chain. */
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};
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struct attr_abbrev
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{
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enum dwarf_attribute name;
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enum dwarf_form form;
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};
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#ifndef ABBREV_HASH_SIZE
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#define ABBREV_HASH_SIZE 121
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#endif
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#ifndef ATTR_ALLOC_CHUNK
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#define ATTR_ALLOC_CHUNK 4
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#endif
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/* Variable and function hash tables. This is used to speed up look-up
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in lookup_symbol_in_var_table() and lookup_symbol_in_function_table().
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In order to share code between variable and function infos, we use
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a list of untyped pointer for all variable/function info associated with
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a symbol. We waste a bit of memory for list with one node but that
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simplifies the code. */
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struct info_list_node
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{
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struct info_list_node *next;
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void *info;
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};
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/* Info hash entry. */
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struct info_hash_entry
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{
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struct bfd_hash_entry root;
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struct info_list_node *head;
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};
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struct info_hash_table
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{
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struct bfd_hash_table base;
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};
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/* Function to create a new entry in info hash table. */
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static struct bfd_hash_entry *
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info_hash_table_newfunc (struct bfd_hash_entry *entry,
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struct bfd_hash_table *table,
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const char *string)
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{
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struct info_hash_entry *ret = (struct info_hash_entry *) entry;
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/* Allocate the structure if it has not already been allocated by a
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derived class. */
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if (ret == NULL)
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{
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ret = bfd_hash_allocate (table, sizeof (* ret));
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if (ret == NULL)
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return NULL;
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}
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/* Call the allocation method of the base class. */
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ret = ((struct info_hash_entry *)
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bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string));
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/* Initialize the local fields here. */
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if (ret)
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ret->head = NULL;
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return (struct bfd_hash_entry *) ret;
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}
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/* Function to create a new info hash table. It returns a pointer to the
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newly created table or NULL if there is any error. We need abfd
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solely for memory allocation. */
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static struct info_hash_table *
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create_info_hash_table (bfd *abfd)
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{
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struct info_hash_table *hash_table;
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hash_table = bfd_alloc (abfd, sizeof (struct info_hash_table));
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if (!hash_table)
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return hash_table;
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if (!bfd_hash_table_init (&hash_table->base, info_hash_table_newfunc,
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sizeof (struct info_hash_entry)))
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{
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bfd_release (abfd, hash_table);
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return NULL;
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}
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return hash_table;
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}
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/* Insert an info entry into an info hash table. We do not check of
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duplicate entries. Also, the caller need to guarantee that the
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right type of info in inserted as info is passed as a void* pointer.
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This function returns true if there is no error. */
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static bfd_boolean
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insert_info_hash_table (struct info_hash_table *hash_table,
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const char *key,
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void *info,
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bfd_boolean copy_p)
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{
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struct info_hash_entry *entry;
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struct info_list_node *node;
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entry = (struct info_hash_entry*) bfd_hash_lookup (&hash_table->base,
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key, TRUE, copy_p);
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if (!entry)
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return FALSE;
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node = bfd_hash_allocate (&hash_table->base, sizeof (*node));
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if (!node)
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return FALSE;
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node->info = info;
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node->next = entry->head;
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entry->head = node;
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return TRUE;
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}
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/* Look up an info entry list from an info hash table. Return NULL
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if there is none. */
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static struct info_list_node *
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lookup_info_hash_table (struct info_hash_table *hash_table, const char *key)
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{
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struct info_hash_entry *entry;
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entry = (struct info_hash_entry*) bfd_hash_lookup (&hash_table->base, key,
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FALSE, FALSE);
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return entry ? entry->head : NULL;
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}
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/* VERBATIM
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The following function up to the END VERBATIM mark are
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copied directly from dwarf2read.c. */
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/* Read dwarf information from a buffer. */
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static unsigned int
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read_1_byte (bfd *abfd ATTRIBUTE_UNUSED, bfd_byte *buf)
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{
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return bfd_get_8 (abfd, buf);
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}
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static int
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read_1_signed_byte (bfd *abfd ATTRIBUTE_UNUSED, bfd_byte *buf)
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{
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return bfd_get_signed_8 (abfd, buf);
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}
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static unsigned int
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read_2_bytes (bfd *abfd, bfd_byte *buf)
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{
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return bfd_get_16 (abfd, buf);
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}
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static unsigned int
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read_4_bytes (bfd *abfd, bfd_byte *buf)
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{
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return bfd_get_32 (abfd, buf);
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}
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static bfd_uint64_t
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read_8_bytes (bfd *abfd, bfd_byte *buf)
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{
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return bfd_get_64 (abfd, buf);
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}
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static bfd_byte *
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read_n_bytes (bfd *abfd ATTRIBUTE_UNUSED,
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bfd_byte *buf,
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unsigned int size ATTRIBUTE_UNUSED)
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{
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/* If the size of a host char is 8 bits, we can return a pointer
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to the buffer, otherwise we have to copy the data to a buffer
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allocated on the temporary obstack. */
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return buf;
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}
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static char *
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read_string (bfd *abfd ATTRIBUTE_UNUSED,
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bfd_byte *buf,
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unsigned int *bytes_read_ptr)
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{
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/* Return a pointer to the embedded string. */
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char *str = (char *) buf;
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if (*str == '\0')
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{
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*bytes_read_ptr = 1;
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return NULL;
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}
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*bytes_read_ptr = strlen (str) + 1;
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return str;
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}
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static char *
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read_indirect_string (struct comp_unit* unit,
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bfd_byte *buf,
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unsigned int *bytes_read_ptr)
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{
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bfd_uint64_t offset;
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struct dwarf2_debug *stash = unit->stash;
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char *str;
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if (unit->offset_size == 4)
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offset = read_4_bytes (unit->abfd, buf);
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else
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offset = read_8_bytes (unit->abfd, buf);
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*bytes_read_ptr = unit->offset_size;
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if (! stash->dwarf_str_buffer)
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{
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asection *msec;
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bfd *abfd = unit->abfd;
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bfd_size_type sz;
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msec = bfd_get_section_by_name (abfd, ".debug_str");
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if (! msec)
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{
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(*_bfd_error_handler)
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(_("Dwarf Error: Can't find .debug_str section."));
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bfd_set_error (bfd_error_bad_value);
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return NULL;
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}
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sz = msec->rawsize ? msec->rawsize : msec->size;
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stash->dwarf_str_size = sz;
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stash->dwarf_str_buffer = bfd_alloc (abfd, sz);
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if (! stash->dwarf_str_buffer)
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return NULL;
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if (! bfd_get_section_contents (abfd, msec, stash->dwarf_str_buffer,
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0, sz))
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return NULL;
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}
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|
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if (offset >= stash->dwarf_str_size)
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{
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(*_bfd_error_handler) (_("Dwarf Error: DW_FORM_strp offset (%lu) greater than or equal to .debug_str size (%lu)."),
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(unsigned long) offset, stash->dwarf_str_size);
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bfd_set_error (bfd_error_bad_value);
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return NULL;
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}
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str = (char *) stash->dwarf_str_buffer + offset;
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if (*str == '\0')
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return NULL;
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return str;
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}
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|
|
/* END VERBATIM */
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|
|
static bfd_uint64_t
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read_address (struct comp_unit *unit, bfd_byte *buf)
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{
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int signed_vma = get_elf_backend_data (unit->abfd)->sign_extend_vma;
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if (signed_vma)
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{
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switch (unit->addr_size)
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{
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case 8:
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return bfd_get_signed_64 (unit->abfd, buf);
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case 4:
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return bfd_get_signed_32 (unit->abfd, buf);
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case 2:
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return bfd_get_signed_16 (unit->abfd, buf);
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default:
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abort ();
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}
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}
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else
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{
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switch (unit->addr_size)
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{
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case 8:
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return bfd_get_64 (unit->abfd, buf);
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case 4:
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return bfd_get_32 (unit->abfd, buf);
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case 2:
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return bfd_get_16 (unit->abfd, buf);
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default:
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abort ();
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}
|
|
}
|
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}
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|
|
/* Lookup an abbrev_info structure in the abbrev hash table. */
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|
|
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static struct abbrev_info *
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lookup_abbrev (unsigned int number, struct abbrev_info **abbrevs)
|
|
{
|
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unsigned int hash_number;
|
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struct abbrev_info *abbrev;
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|
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hash_number = number % ABBREV_HASH_SIZE;
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|
abbrev = abbrevs[hash_number];
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|
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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 (bfd *abfd, bfd_uint64_t offset, struct dwarf2_debug *stash)
|
|
{
|
|
struct abbrev_info **abbrevs;
|
|
bfd_byte *abbrev_ptr;
|
|
struct abbrev_info *cur_abbrev;
|
|
unsigned int abbrev_number, bytes_read, abbrev_name;
|
|
unsigned int abbrev_form, hash_number;
|
|
bfd_size_type amt;
|
|
|
|
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 = msec->size;
|
|
stash->dwarf_abbrev_buffer
|
|
= bfd_simple_get_relocated_section_contents (abfd, msec, NULL,
|
|
stash->syms);
|
|
if (! stash->dwarf_abbrev_buffer)
|
|
return 0;
|
|
}
|
|
|
|
if (offset >= stash->dwarf_abbrev_size)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Abbrev offset (%lu) greater than or equal to .debug_abbrev size (%lu)."),
|
|
(unsigned long) offset, stash->dwarf_abbrev_size);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
amt = sizeof (struct abbrev_info*) * ABBREV_HASH_SIZE;
|
|
abbrevs = bfd_zalloc (abfd, amt);
|
|
|
|
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)
|
|
{
|
|
amt = sizeof (struct abbrev_info);
|
|
cur_abbrev = bfd_zalloc (abfd, amt);
|
|
|
|
/* Read in abbrev header. */
|
|
cur_abbrev->number = abbrev_number;
|
|
cur_abbrev->tag = (enum dwarf_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)
|
|
{
|
|
struct attr_abbrev *tmp;
|
|
|
|
amt = cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK;
|
|
amt *= sizeof (struct attr_abbrev);
|
|
tmp = bfd_realloc (cur_abbrev->attrs, amt);
|
|
if (tmp == NULL)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < ABBREV_HASH_SIZE; i++)
|
|
{
|
|
struct abbrev_info *abbrev = abbrevs[i];
|
|
|
|
while (abbrev)
|
|
{
|
|
free (abbrev->attrs);
|
|
abbrev = abbrev->next;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
cur_abbrev->attrs = tmp;
|
|
}
|
|
|
|
cur_abbrev->attrs[cur_abbrev->num_attrs].name
|
|
= (enum dwarf_attribute) abbrev_name;
|
|
cur_abbrev->attrs[cur_abbrev->num_attrs++].form
|
|
= (enum dwarf_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 value described by an attribute form. */
|
|
|
|
static bfd_byte *
|
|
read_attribute_value (struct attribute *attr,
|
|
unsigned form,
|
|
struct comp_unit *unit,
|
|
bfd_byte *info_ptr)
|
|
{
|
|
bfd *abfd = unit->abfd;
|
|
unsigned int bytes_read;
|
|
struct dwarf_block *blk;
|
|
bfd_size_type amt;
|
|
|
|
attr->form = (enum dwarf_form) form;
|
|
|
|
switch (form)
|
|
{
|
|
case DW_FORM_addr:
|
|
/* FIXME: DWARF3 draft says DW_FORM_ref_addr is offset_size. */
|
|
case DW_FORM_ref_addr:
|
|
attr->u.val = read_address (unit, info_ptr);
|
|
info_ptr += unit->addr_size;
|
|
break;
|
|
case DW_FORM_block2:
|
|
amt = sizeof (struct dwarf_block);
|
|
blk = bfd_alloc (abfd, amt);
|
|
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;
|
|
attr->u.blk = blk;
|
|
break;
|
|
case DW_FORM_block4:
|
|
amt = sizeof (struct dwarf_block);
|
|
blk = bfd_alloc (abfd, amt);
|
|
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;
|
|
attr->u.blk = blk;
|
|
break;
|
|
case DW_FORM_data2:
|
|
attr->u.val = read_2_bytes (abfd, info_ptr);
|
|
info_ptr += 2;
|
|
break;
|
|
case DW_FORM_data4:
|
|
attr->u.val = read_4_bytes (abfd, info_ptr);
|
|
info_ptr += 4;
|
|
break;
|
|
case DW_FORM_data8:
|
|
attr->u.val = read_8_bytes (abfd, info_ptr);
|
|
info_ptr += 8;
|
|
break;
|
|
case DW_FORM_string:
|
|
attr->u.str = read_string (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_strp:
|
|
attr->u.str = read_indirect_string (unit, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_block:
|
|
amt = sizeof (struct dwarf_block);
|
|
blk = bfd_alloc (abfd, amt);
|
|
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;
|
|
attr->u.blk = blk;
|
|
break;
|
|
case DW_FORM_block1:
|
|
amt = sizeof (struct dwarf_block);
|
|
blk = bfd_alloc (abfd, amt);
|
|
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;
|
|
attr->u.blk = blk;
|
|
break;
|
|
case DW_FORM_data1:
|
|
attr->u.val = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
break;
|
|
case DW_FORM_flag:
|
|
attr->u.val = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
break;
|
|
case DW_FORM_sdata:
|
|
attr->u.sval = read_signed_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_udata:
|
|
attr->u.val = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_ref1:
|
|
attr->u.val = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
break;
|
|
case DW_FORM_ref2:
|
|
attr->u.val = read_2_bytes (abfd, info_ptr);
|
|
info_ptr += 2;
|
|
break;
|
|
case DW_FORM_ref4:
|
|
attr->u.val = read_4_bytes (abfd, info_ptr);
|
|
info_ptr += 4;
|
|
break;
|
|
case DW_FORM_ref8:
|
|
attr->u.val = read_8_bytes (abfd, info_ptr);
|
|
info_ptr += 8;
|
|
break;
|
|
case DW_FORM_ref_udata:
|
|
attr->u.val = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_indirect:
|
|
form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
info_ptr = read_attribute_value (attr, form, unit, info_ptr);
|
|
break;
|
|
default:
|
|
(*_bfd_error_handler) (_("Dwarf Error: Invalid or unhandled FORM value: %u."),
|
|
form);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
}
|
|
return info_ptr;
|
|
}
|
|
|
|
/* Read an attribute described by an abbreviated attribute. */
|
|
|
|
static bfd_byte *
|
|
read_attribute (struct attribute *attr,
|
|
struct attr_abbrev *abbrev,
|
|
struct comp_unit *unit,
|
|
bfd_byte *info_ptr)
|
|
{
|
|
attr->name = abbrev->name;
|
|
info_ptr = read_attribute_value (attr, abbrev->form, unit, info_ptr);
|
|
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;
|
|
int end_sequence; /* End of (sequential) code sequence. */
|
|
};
|
|
|
|
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; /* largest VMA */
|
|
struct line_info* lcl_head; /* local head; used in 'add_line_info' */
|
|
};
|
|
|
|
/* Remember some information about each function. If the function is
|
|
inlined (DW_TAG_inlined_subroutine) it may have two additional
|
|
attributes, DW_AT_call_file and DW_AT_call_line, which specify the
|
|
source code location where this function was inlined. */
|
|
|
|
struct funcinfo
|
|
{
|
|
struct funcinfo *prev_func; /* Pointer to previous function in list of all functions */
|
|
struct funcinfo *caller_func; /* Pointer to function one scope higher */
|
|
char *caller_file; /* Source location file name where caller_func inlines this func */
|
|
int caller_line; /* Source location line number where caller_func inlines this func */
|
|
char *file; /* Source location file name */
|
|
int line; /* Source location line number */
|
|
int tag;
|
|
char *name;
|
|
struct arange arange;
|
|
asection *sec; /* Where the symbol is defined */
|
|
};
|
|
|
|
struct varinfo
|
|
{
|
|
/* Pointer to previous variable in list of all variables */
|
|
struct varinfo *prev_var;
|
|
/* Source location file name */
|
|
char *file;
|
|
/* Source location line number */
|
|
int line;
|
|
int tag;
|
|
char *name;
|
|
bfd_vma addr;
|
|
/* Where the symbol is defined */
|
|
asection *sec;
|
|
/* Is this a stack variable? */
|
|
unsigned int stack: 1;
|
|
};
|
|
|
|
/* Return TRUE if NEW_LINE should sort after LINE. */
|
|
|
|
static inline bfd_boolean
|
|
new_line_sorts_after (struct line_info *new_line, struct line_info *line)
|
|
{
|
|
return (new_line->address > line->address
|
|
|| (new_line->address == line->address
|
|
&& new_line->end_sequence < line->end_sequence));
|
|
}
|
|
|
|
|
|
/* Adds a new entry to the line_info list in the line_info_table, ensuring
|
|
that the list is sorted. Note that the line_info list is sorted from
|
|
highest to lowest VMA (with possible duplicates); that is,
|
|
line_info->prev_line always accesses an equal or smaller VMA. */
|
|
|
|
static void
|
|
add_line_info (struct line_info_table *table,
|
|
bfd_vma address,
|
|
char *filename,
|
|
unsigned int line,
|
|
unsigned int column,
|
|
int end_sequence)
|
|
{
|
|
bfd_size_type amt = sizeof (struct line_info);
|
|
struct line_info* info = bfd_alloc (table->abfd, amt);
|
|
|
|
/* Set member data of 'info'. */
|
|
info->address = address;
|
|
info->line = line;
|
|
info->column = column;
|
|
info->end_sequence = end_sequence;
|
|
|
|
if (filename && filename[0])
|
|
{
|
|
info->filename = bfd_alloc (table->abfd, strlen (filename) + 1);
|
|
if (info->filename)
|
|
strcpy (info->filename, filename);
|
|
}
|
|
else
|
|
info->filename = NULL;
|
|
|
|
/* Find the correct location for 'info'. Normally we will receive
|
|
new line_info data 1) in order and 2) with increasing VMAs.
|
|
However some compilers break the rules (cf. decode_line_info) and
|
|
so we include some heuristics for quickly finding the correct
|
|
location for 'info'. In particular, these heuristics optimize for
|
|
the common case in which the VMA sequence that we receive is a
|
|
list of locally sorted VMAs such as
|
|
p...z a...j (where a < j < p < z)
|
|
|
|
Note: table->lcl_head is used to head an *actual* or *possible*
|
|
sequence within the list (such as a...j) that is not directly
|
|
headed by table->last_line
|
|
|
|
Note: we may receive duplicate entries from 'decode_line_info'. */
|
|
|
|
if (table->last_line
|
|
&& table->last_line->address == address
|
|
&& table->last_line->end_sequence == end_sequence)
|
|
{
|
|
/* We only keep the last entry with the same address and end
|
|
sequence. See PR ld/4986. */
|
|
if (table->lcl_head == table->last_line)
|
|
table->lcl_head = info;
|
|
info->prev_line = table->last_line->prev_line;
|
|
table->last_line = info;
|
|
}
|
|
else if (!table->last_line
|
|
|| new_line_sorts_after (info, table->last_line))
|
|
{
|
|
/* Normal case: add 'info' to the beginning of the list */
|
|
info->prev_line = table->last_line;
|
|
table->last_line = info;
|
|
|
|
/* lcl_head: initialize to head a *possible* sequence at the end. */
|
|
if (!table->lcl_head)
|
|
table->lcl_head = info;
|
|
}
|
|
else if (!new_line_sorts_after (info, table->lcl_head)
|
|
&& (!table->lcl_head->prev_line
|
|
|| new_line_sorts_after (info, table->lcl_head->prev_line)))
|
|
{
|
|
/* Abnormal but easy: lcl_head is the head of 'info'. */
|
|
info->prev_line = table->lcl_head->prev_line;
|
|
table->lcl_head->prev_line = info;
|
|
}
|
|
else
|
|
{
|
|
/* Abnormal and hard: Neither 'last_line' nor 'lcl_head' are valid
|
|
heads for 'info'. Reset 'lcl_head'. */
|
|
struct line_info* li2 = table->last_line; /* always non-NULL */
|
|
struct line_info* li1 = li2->prev_line;
|
|
|
|
while (li1)
|
|
{
|
|
if (!new_line_sorts_after (info, li2)
|
|
&& new_line_sorts_after (info, li1))
|
|
break;
|
|
|
|
li2 = li1; /* always non-NULL */
|
|
li1 = li1->prev_line;
|
|
}
|
|
table->lcl_head = li2;
|
|
info->prev_line = table->lcl_head->prev_line;
|
|
table->lcl_head->prev_line = info;
|
|
}
|
|
}
|
|
|
|
/* Extract a fully qualified filename from a line info table.
|
|
The returned string has been malloc'ed and it is the caller's
|
|
responsibility to free it. */
|
|
|
|
static char *
|
|
concat_filename (struct line_info_table *table, unsigned int file)
|
|
{
|
|
char *filename;
|
|
|
|
if (file - 1 >= table->num_files)
|
|
{
|
|
/* FILE == 0 means unknown. */
|
|
if (file)
|
|
(*_bfd_error_handler)
|
|
(_("Dwarf Error: mangled line number section (bad file number)."));
|
|
return strdup ("<unknown>");
|
|
}
|
|
|
|
filename = table->files[file - 1].name;
|
|
|
|
if (!IS_ABSOLUTE_PATH (filename))
|
|
{
|
|
char *dirname = NULL;
|
|
char *subdirname = NULL;
|
|
char *name;
|
|
size_t len;
|
|
|
|
if (table->files[file - 1].dir)
|
|
subdirname = table->dirs[table->files[file - 1].dir - 1];
|
|
|
|
if (!subdirname || !IS_ABSOLUTE_PATH (subdirname))
|
|
dirname = table->comp_dir;
|
|
|
|
if (!dirname)
|
|
{
|
|
dirname = subdirname;
|
|
subdirname = NULL;
|
|
}
|
|
|
|
if (!dirname)
|
|
return strdup (filename);
|
|
|
|
len = strlen (dirname) + strlen (filename) + 2;
|
|
|
|
if (subdirname)
|
|
{
|
|
len += strlen (subdirname) + 1;
|
|
name = bfd_malloc (len);
|
|
if (name)
|
|
sprintf (name, "%s/%s/%s", dirname, subdirname, filename);
|
|
}
|
|
else
|
|
{
|
|
name = bfd_malloc (len);
|
|
if (name)
|
|
sprintf (name, "%s/%s", dirname, filename);
|
|
}
|
|
|
|
return name;
|
|
}
|
|
|
|
return strdup (filename);
|
|
}
|
|
|
|
static void
|
|
arange_add (bfd *abfd, struct arange *first_arange, bfd_vma low_pc, bfd_vma high_pc)
|
|
{
|
|
struct arange *arange;
|
|
|
|
/* If the first arange is empty, use it. */
|
|
if (first_arange->high == 0)
|
|
{
|
|
first_arange->low = low_pc;
|
|
first_arange->high = high_pc;
|
|
return;
|
|
}
|
|
|
|
/* Next see if we can cheaply extend an existing range. */
|
|
arange = first_arange;
|
|
do
|
|
{
|
|
if (low_pc == arange->high)
|
|
{
|
|
arange->high = high_pc;
|
|
return;
|
|
}
|
|
if (high_pc == arange->low)
|
|
{
|
|
arange->low = low_pc;
|
|
return;
|
|
}
|
|
arange = arange->next;
|
|
}
|
|
while (arange);
|
|
|
|
/* Need to allocate a new arange and insert it into the arange list.
|
|
Order isn't significant, so just insert after the first arange. */
|
|
arange = bfd_zalloc (abfd, sizeof (*arange));
|
|
arange->low = low_pc;
|
|
arange->high = high_pc;
|
|
arange->next = first_arange->next;
|
|
first_arange->next = arange;
|
|
}
|
|
|
|
/* Decode the line number information for UNIT. */
|
|
|
|
static struct line_info_table*
|
|
decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash)
|
|
{
|
|
bfd *abfd = unit->abfd;
|
|
struct line_info_table* table;
|
|
bfd_byte *line_ptr;
|
|
bfd_byte *line_end;
|
|
struct line_head lh;
|
|
unsigned int i, bytes_read, offset_size;
|
|
char *cur_file, *cur_dir;
|
|
unsigned char op_code, extended_op, adj_opcode;
|
|
bfd_size_type amt;
|
|
|
|
if (! stash->dwarf_line_buffer)
|
|
{
|
|
asection *msec;
|
|
|
|
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;
|
|
}
|
|
|
|
stash->dwarf_line_size = msec->size;
|
|
stash->dwarf_line_buffer
|
|
= bfd_simple_get_relocated_section_contents (abfd, msec, NULL,
|
|
stash->syms);
|
|
if (! stash->dwarf_line_buffer)
|
|
return 0;
|
|
}
|
|
|
|
/* It is possible to get a bad value for the line_offset. Validate
|
|
it here so that we won't get a segfault below. */
|
|
if (unit->line_offset >= stash->dwarf_line_size)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Line offset (%lu) greater than or equal to .debug_line size (%lu)."),
|
|
unit->line_offset, stash->dwarf_line_size);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
amt = sizeof (struct line_info_table);
|
|
table = bfd_alloc (abfd, amt);
|
|
table->abfd = abfd;
|
|
table->comp_dir = unit->comp_dir;
|
|
|
|
table->num_files = 0;
|
|
table->files = NULL;
|
|
|
|
table->num_dirs = 0;
|
|
table->dirs = NULL;
|
|
|
|
table->files = NULL;
|
|
table->last_line = NULL;
|
|
table->lcl_head = NULL;
|
|
|
|
line_ptr = stash->dwarf_line_buffer + unit->line_offset;
|
|
|
|
/* Read in the prologue. */
|
|
lh.total_length = read_4_bytes (abfd, line_ptr);
|
|
line_ptr += 4;
|
|
offset_size = 4;
|
|
if (lh.total_length == 0xffffffff)
|
|
{
|
|
lh.total_length = read_8_bytes (abfd, line_ptr);
|
|
line_ptr += 8;
|
|
offset_size = 8;
|
|
}
|
|
else if (lh.total_length == 0 && unit->addr_size == 8)
|
|
{
|
|
/* Handle (non-standard) 64-bit DWARF2 formats. */
|
|
lh.total_length = read_4_bytes (abfd, line_ptr);
|
|
line_ptr += 4;
|
|
offset_size = 8;
|
|
}
|
|
line_end = line_ptr + lh.total_length;
|
|
lh.version = read_2_bytes (abfd, line_ptr);
|
|
line_ptr += 2;
|
|
if (offset_size == 4)
|
|
lh.prologue_length = read_4_bytes (abfd, line_ptr);
|
|
else
|
|
lh.prologue_length = read_8_bytes (abfd, line_ptr);
|
|
line_ptr += offset_size;
|
|
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;
|
|
amt = lh.opcode_base * sizeof (unsigned char);
|
|
lh.standard_opcode_lengths = bfd_alloc (abfd, amt);
|
|
|
|
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)
|
|
{
|
|
char **tmp;
|
|
|
|
amt = table->num_dirs + DIR_ALLOC_CHUNK;
|
|
amt *= sizeof (char *);
|
|
|
|
tmp = bfd_realloc (table->dirs, amt);
|
|
if (tmp == NULL)
|
|
{
|
|
free (table->dirs);
|
|
return NULL;
|
|
}
|
|
table->dirs = tmp;
|
|
}
|
|
|
|
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)
|
|
{
|
|
struct fileinfo *tmp;
|
|
|
|
amt = table->num_files + FILE_ALLOC_CHUNK;
|
|
amt *= sizeof (struct fileinfo);
|
|
|
|
tmp = bfd_realloc (table->files, amt);
|
|
if (tmp == NULL)
|
|
{
|
|
free (table->files);
|
|
free (table->dirs);
|
|
return NULL;
|
|
}
|
|
table->files = tmp;
|
|
}
|
|
|
|
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 = table->num_files ? concat_filename (table, 1) : NULL;
|
|
unsigned int line = 1;
|
|
unsigned int column = 0;
|
|
int is_stmt = lh.default_is_stmt;
|
|
int end_sequence = 0;
|
|
/* eraxxon@alumni.rice.edu: Against the DWARF2 specs, some
|
|
compilers generate address sequences that are wildly out of
|
|
order using DW_LNE_set_address (e.g. Intel C++ 6.0 compiler
|
|
for ia64-Linux). Thus, to determine the low and high
|
|
address, we must compare on every DW_LNS_copy, etc. */
|
|
bfd_vma low_pc = (bfd_vma) -1;
|
|
bfd_vma high_pc = 0;
|
|
|
|
/* Decode the table. */
|
|
while (! end_sequence)
|
|
{
|
|
op_code = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
|
|
if (op_code >= lh.opcode_base)
|
|
{
|
|
/* 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, 0);
|
|
if (address < low_pc)
|
|
low_pc = address;
|
|
if (address > high_pc)
|
|
high_pc = address;
|
|
}
|
|
else switch (op_code)
|
|
{
|
|
case DW_LNS_extended_op:
|
|
/* Ignore length. */
|
|
line_ptr += 1;
|
|
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,
|
|
end_sequence);
|
|
if (address < low_pc)
|
|
low_pc = address;
|
|
if (address > high_pc)
|
|
high_pc = address;
|
|
arange_add (unit->abfd, &unit->arange, low_pc, high_pc);
|
|
break;
|
|
case DW_LNE_set_address:
|
|
address = read_address (unit, line_ptr);
|
|
line_ptr += unit->addr_size;
|
|
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)
|
|
{
|
|
struct fileinfo *tmp;
|
|
|
|
amt = table->num_files + FILE_ALLOC_CHUNK;
|
|
amt *= sizeof (struct fileinfo);
|
|
tmp = bfd_realloc (table->files, amt);
|
|
if (tmp == NULL)
|
|
{
|
|
free (table->files);
|
|
free (table->dirs);
|
|
free (filename);
|
|
return NULL;
|
|
}
|
|
table->files = tmp;
|
|
}
|
|
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);
|
|
free (filename);
|
|
free (table->files);
|
|
free (table->dirs);
|
|
return NULL;
|
|
}
|
|
break;
|
|
case DW_LNS_copy:
|
|
add_line_info (table, address, filename, line, column, 0);
|
|
if (address < low_pc)
|
|
low_pc = address;
|
|
if (address > high_pc)
|
|
high_pc = address;
|
|
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;
|
|
if (filename)
|
|
free (filename);
|
|
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:
|
|
break;
|
|
case DW_LNS_const_add_pc:
|
|
address += lh.minimum_instruction_length
|
|
* ((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:
|
|
{
|
|
int i;
|
|
|
|
/* Unknown standard opcode, ignore it. */
|
|
for (i = 0; i < lh.standard_opcode_lengths[op_code]; i++)
|
|
{
|
|
(void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (filename)
|
|
free (filename);
|
|
}
|
|
|
|
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 bfd_boolean
|
|
lookup_address_in_line_info_table (struct line_info_table *table,
|
|
bfd_vma addr,
|
|
struct funcinfo *function,
|
|
const char **filename_ptr,
|
|
unsigned int *linenumber_ptr)
|
|
{
|
|
/* Note: table->last_line should be a descendingly sorted list. */
|
|
struct line_info* next_line = table->last_line;
|
|
struct line_info* each_line = NULL;
|
|
*filename_ptr = NULL;
|
|
|
|
if (!next_line)
|
|
return FALSE;
|
|
|
|
each_line = next_line->prev_line;
|
|
|
|
/* Check for large addresses */
|
|
if (addr > next_line->address)
|
|
each_line = NULL; /* ensure we skip over the normal case */
|
|
|
|
/* Normal case: search the list; save */
|
|
while (each_line && next_line)
|
|
{
|
|
/* If we have an address match, save this info. This allows us
|
|
to return as good as results as possible for strange debugging
|
|
info. */
|
|
bfd_boolean addr_match = FALSE;
|
|
if (each_line->address <= addr && addr < next_line->address)
|
|
{
|
|
addr_match = TRUE;
|
|
|
|
/* If this line appears to span functions, and addr is in the
|
|
later function, return the first line of that function instead
|
|
of the last line of the earlier one. This check is for GCC
|
|
2.95, which emits the first line number for a function late. */
|
|
|
|
if (function != NULL)
|
|
{
|
|
bfd_vma lowest_pc;
|
|
struct arange *arange;
|
|
|
|
/* Find the lowest address in the function's range list */
|
|
lowest_pc = function->arange.low;
|
|
for (arange = &function->arange;
|
|
arange;
|
|
arange = arange->next)
|
|
{
|
|
if (function->arange.low < lowest_pc)
|
|
lowest_pc = function->arange.low;
|
|
}
|
|
/* Check for spanning function and set outgoing line info */
|
|
if (addr >= lowest_pc
|
|
&& each_line->address < lowest_pc
|
|
&& next_line->address > lowest_pc)
|
|
{
|
|
*filename_ptr = next_line->filename;
|
|
*linenumber_ptr = next_line->line;
|
|
}
|
|
else
|
|
{
|
|
*filename_ptr = each_line->filename;
|
|
*linenumber_ptr = each_line->line;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
*filename_ptr = each_line->filename;
|
|
*linenumber_ptr = each_line->line;
|
|
}
|
|
}
|
|
|
|
if (addr_match && !each_line->end_sequence)
|
|
return TRUE; /* we have definitely found what we want */
|
|
|
|
next_line = each_line;
|
|
each_line = each_line->prev_line;
|
|
}
|
|
|
|
/* At this point each_line is NULL but next_line is not. If we found
|
|
a candidate end-of-sequence point in the loop above, we can return
|
|
that (compatibility with a bug in the Intel compiler); otherwise,
|
|
assuming that we found the containing function for this address in
|
|
this compilation unit, return the first line we have a number for
|
|
(compatibility with GCC 2.95). */
|
|
if (*filename_ptr == NULL && function != NULL)
|
|
{
|
|
*filename_ptr = next_line->filename;
|
|
*linenumber_ptr = next_line->line;
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read in the .debug_ranges section for future reference */
|
|
|
|
static bfd_boolean
|
|
read_debug_ranges (struct comp_unit *unit)
|
|
{
|
|
struct dwarf2_debug *stash = unit->stash;
|
|
if (! stash->dwarf_ranges_buffer)
|
|
{
|
|
bfd *abfd = unit->abfd;
|
|
asection *msec;
|
|
|
|
msec = bfd_get_section_by_name (abfd, ".debug_ranges");
|
|
if (! msec)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Can't find .debug_ranges section."));
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return FALSE;
|
|
}
|
|
|
|
stash->dwarf_ranges_size = msec->size;
|
|
stash->dwarf_ranges_buffer
|
|
= bfd_simple_get_relocated_section_contents (abfd, msec, NULL,
|
|
stash->syms);
|
|
if (! stash->dwarf_ranges_buffer)
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/* Function table functions. */
|
|
|
|
/* If ADDR is within TABLE, set FUNCTIONNAME_PTR, and return TRUE.
|
|
Note that we need to find the function that has the smallest
|
|
range that contains ADDR, to handle inlined functions without
|
|
depending upon them being ordered in TABLE by increasing range. */
|
|
|
|
static bfd_boolean
|
|
lookup_address_in_function_table (struct comp_unit *unit,
|
|
bfd_vma addr,
|
|
struct funcinfo **function_ptr,
|
|
const char **functionname_ptr)
|
|
{
|
|
struct funcinfo* each_func;
|
|
struct funcinfo* best_fit = NULL;
|
|
struct arange *arange;
|
|
|
|
for (each_func = unit->function_table;
|
|
each_func;
|
|
each_func = each_func->prev_func)
|
|
{
|
|
for (arange = &each_func->arange;
|
|
arange;
|
|
arange = arange->next)
|
|
{
|
|
if (addr >= arange->low && addr < arange->high)
|
|
{
|
|
if (!best_fit ||
|
|
((arange->high - arange->low) < (best_fit->arange.high - best_fit->arange.low)))
|
|
best_fit = each_func;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (best_fit)
|
|
{
|
|
*functionname_ptr = best_fit->name;
|
|
*function_ptr = best_fit;
|
|
return TRUE;
|
|
}
|
|
else
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* If SYM at ADDR is within function table of UNIT, set FILENAME_PTR
|
|
and LINENUMBER_PTR, and return TRUE. */
|
|
|
|
static bfd_boolean
|
|
lookup_symbol_in_function_table (struct comp_unit *unit,
|
|
asymbol *sym,
|
|
bfd_vma addr,
|
|
const char **filename_ptr,
|
|
unsigned int *linenumber_ptr)
|
|
{
|
|
struct funcinfo* each_func;
|
|
struct funcinfo* best_fit = NULL;
|
|
struct arange *arange;
|
|
const char *name = bfd_asymbol_name (sym);
|
|
asection *sec = bfd_get_section (sym);
|
|
|
|
for (each_func = unit->function_table;
|
|
each_func;
|
|
each_func = each_func->prev_func)
|
|
{
|
|
for (arange = &each_func->arange;
|
|
arange;
|
|
arange = arange->next)
|
|
{
|
|
if ((!each_func->sec || each_func->sec == sec)
|
|
&& addr >= arange->low
|
|
&& addr < arange->high
|
|
&& each_func->name
|
|
&& strcmp (name, each_func->name) == 0
|
|
&& (!best_fit
|
|
|| ((arange->high - arange->low)
|
|
< (best_fit->arange.high - best_fit->arange.low))))
|
|
best_fit = each_func;
|
|
}
|
|
}
|
|
|
|
if (best_fit)
|
|
{
|
|
best_fit->sec = sec;
|
|
*filename_ptr = best_fit->file;
|
|
*linenumber_ptr = best_fit->line;
|
|
return TRUE;
|
|
}
|
|
else
|
|
return FALSE;
|
|
}
|
|
|
|
/* Variable table functions. */
|
|
|
|
/* If SYM is within variable table of UNIT, set FILENAME_PTR and
|
|
LINENUMBER_PTR, and return TRUE. */
|
|
|
|
static bfd_boolean
|
|
lookup_symbol_in_variable_table (struct comp_unit *unit,
|
|
asymbol *sym,
|
|
bfd_vma addr,
|
|
const char **filename_ptr,
|
|
unsigned int *linenumber_ptr)
|
|
{
|
|
const char *name = bfd_asymbol_name (sym);
|
|
asection *sec = bfd_get_section (sym);
|
|
struct varinfo* each;
|
|
|
|
for (each = unit->variable_table; each; each = each->prev_var)
|
|
if (each->stack == 0
|
|
&& each->file != NULL
|
|
&& each->name != NULL
|
|
&& each->addr == addr
|
|
&& (!each->sec || each->sec == sec)
|
|
&& strcmp (name, each->name) == 0)
|
|
break;
|
|
|
|
if (each)
|
|
{
|
|
each->sec = sec;
|
|
*filename_ptr = each->file;
|
|
*linenumber_ptr = each->line;
|
|
return TRUE;
|
|
}
|
|
else
|
|
return FALSE;
|
|
}
|
|
|
|
static char *
|
|
find_abstract_instance_name (struct comp_unit *unit, bfd_uint64_t die_ref)
|
|
{
|
|
bfd *abfd = unit->abfd;
|
|
bfd_byte *info_ptr;
|
|
unsigned int abbrev_number, bytes_read, i;
|
|
struct abbrev_info *abbrev;
|
|
struct attribute attr;
|
|
char *name = 0;
|
|
|
|
info_ptr = unit->info_ptr_unit + die_ref;
|
|
abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
|
|
if (abbrev_number)
|
|
{
|
|
abbrev = lookup_abbrev (abbrev_number, unit->abbrevs);
|
|
if (! abbrev)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: Could not find abbrev number %u."),
|
|
abbrev_number);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
}
|
|
else
|
|
{
|
|
for (i = 0; i < abbrev->num_attrs; ++i)
|
|
{
|
|
info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, info_ptr);
|
|
switch (attr.name)
|
|
{
|
|
case DW_AT_name:
|
|
/* Prefer DW_AT_MIPS_linkage_name over DW_AT_name. */
|
|
if (name == NULL)
|
|
name = attr.u.str;
|
|
break;
|
|
case DW_AT_specification:
|
|
name = find_abstract_instance_name (unit, attr.u.val);
|
|
break;
|
|
case DW_AT_MIPS_linkage_name:
|
|
name = attr.u.str;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return (name);
|
|
}
|
|
|
|
static void
|
|
read_rangelist (struct comp_unit *unit, struct arange *arange, bfd_uint64_t offset)
|
|
{
|
|
bfd_byte *ranges_ptr;
|
|
bfd_vma base_address = unit->base_address;
|
|
|
|
if (! unit->stash->dwarf_ranges_buffer)
|
|
{
|
|
if (! read_debug_ranges (unit))
|
|
return;
|
|
}
|
|
ranges_ptr = unit->stash->dwarf_ranges_buffer + offset;
|
|
|
|
for (;;)
|
|
{
|
|
bfd_vma low_pc;
|
|
bfd_vma high_pc;
|
|
|
|
if (unit->addr_size == 4)
|
|
{
|
|
low_pc = read_4_bytes (unit->abfd, ranges_ptr);
|
|
ranges_ptr += 4;
|
|
high_pc = read_4_bytes (unit->abfd, ranges_ptr);
|
|
ranges_ptr += 4;
|
|
}
|
|
else
|
|
{
|
|
low_pc = read_8_bytes (unit->abfd, ranges_ptr);
|
|
ranges_ptr += 8;
|
|
high_pc = read_8_bytes (unit->abfd, ranges_ptr);
|
|
ranges_ptr += 8;
|
|
}
|
|
if (low_pc == 0 && high_pc == 0)
|
|
break;
|
|
if (low_pc == -1UL && high_pc != -1UL)
|
|
base_address = high_pc;
|
|
else
|
|
arange_add (unit->abfd, arange, base_address + low_pc, base_address + high_pc);
|
|
}
|
|
}
|
|
|
|
/* DWARF2 Compilation unit functions. */
|
|
|
|
/* Scan over each die in a comp. unit looking for functions to add
|
|
to the function table and variables to the variable table. */
|
|
|
|
static bfd_boolean
|
|
scan_unit_for_symbols (struct comp_unit *unit)
|
|
{
|
|
bfd *abfd = unit->abfd;
|
|
bfd_byte *info_ptr = unit->first_child_die_ptr;
|
|
int nesting_level = 1;
|
|
struct funcinfo **nested_funcs;
|
|
int nested_funcs_size;
|
|
|
|
/* Maintain a stack of in-scope functions and inlined functions, which we
|
|
can use to set the caller_func field. */
|
|
nested_funcs_size = 32;
|
|
nested_funcs = bfd_malloc (nested_funcs_size * sizeof (struct funcinfo *));
|
|
if (nested_funcs == NULL)
|
|
return FALSE;
|
|
nested_funcs[nesting_level] = 0;
|
|
|
|
while (nesting_level)
|
|
{
|
|
unsigned int abbrev_number, bytes_read, i;
|
|
struct abbrev_info *abbrev;
|
|
struct attribute attr;
|
|
struct funcinfo *func;
|
|
struct varinfo *var;
|
|
bfd_vma low_pc = 0;
|
|
bfd_vma high_pc = 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 %u."),
|
|
abbrev_number);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
free (nested_funcs);
|
|
return FALSE;
|
|
}
|
|
|
|
var = NULL;
|
|
if (abbrev->tag == DW_TAG_subprogram
|
|
|| abbrev->tag == DW_TAG_entry_point
|
|
|| abbrev->tag == DW_TAG_inlined_subroutine)
|
|
{
|
|
bfd_size_type amt = sizeof (struct funcinfo);
|
|
func = bfd_zalloc (abfd, amt);
|
|
func->tag = abbrev->tag;
|
|
func->prev_func = unit->function_table;
|
|
unit->function_table = func;
|
|
BFD_ASSERT (!unit->cached);
|
|
|
|
if (func->tag == DW_TAG_inlined_subroutine)
|
|
for (i = nesting_level - 1; i >= 1; i--)
|
|
if (nested_funcs[i])
|
|
{
|
|
func->caller_func = nested_funcs[i];
|
|
break;
|
|
}
|
|
nested_funcs[nesting_level] = func;
|
|
}
|
|
else
|
|
{
|
|
func = NULL;
|
|
if (abbrev->tag == DW_TAG_variable)
|
|
{
|
|
bfd_size_type amt = sizeof (struct varinfo);
|
|
var = bfd_zalloc (abfd, amt);
|
|
var->tag = abbrev->tag;
|
|
var->stack = 1;
|
|
var->prev_var = unit->variable_table;
|
|
unit->variable_table = var;
|
|
BFD_ASSERT (!unit->cached);
|
|
}
|
|
|
|
/* No inline function in scope at this nesting level. */
|
|
nested_funcs[nesting_level] = 0;
|
|
}
|
|
|
|
for (i = 0; i < abbrev->num_attrs; ++i)
|
|
{
|
|
info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, info_ptr);
|
|
|
|
if (func)
|
|
{
|
|
switch (attr.name)
|
|
{
|
|
case DW_AT_call_file:
|
|
func->caller_file = concat_filename (unit->line_table, attr.u.val);
|
|
break;
|
|
|
|
case DW_AT_call_line:
|
|
func->caller_line = attr.u.val;
|
|
break;
|
|
|
|
case DW_AT_abstract_origin:
|
|
func->name = find_abstract_instance_name (unit, attr.u.val);
|
|
break;
|
|
|
|
case DW_AT_name:
|
|
/* Prefer DW_AT_MIPS_linkage_name over DW_AT_name. */
|
|
if (func->name == NULL)
|
|
func->name = attr.u.str;
|
|
break;
|
|
|
|
case DW_AT_MIPS_linkage_name:
|
|
func->name = attr.u.str;
|
|
break;
|
|
|
|
case DW_AT_low_pc:
|
|
low_pc = attr.u.val;
|
|
break;
|
|
|
|
case DW_AT_high_pc:
|
|
high_pc = attr.u.val;
|
|
break;
|
|
|
|
case DW_AT_ranges:
|
|
read_rangelist (unit, &func->arange, attr.u.val);
|
|
break;
|
|
|
|
case DW_AT_decl_file:
|
|
func->file = concat_filename (unit->line_table,
|
|
attr.u.val);
|
|
break;
|
|
|
|
case DW_AT_decl_line:
|
|
func->line = attr.u.val;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
else if (var)
|
|
{
|
|
switch (attr.name)
|
|
{
|
|
case DW_AT_name:
|
|
var->name = attr.u.str;
|
|
break;
|
|
|
|
case DW_AT_decl_file:
|
|
var->file = concat_filename (unit->line_table,
|
|
attr.u.val);
|
|
break;
|
|
|
|
case DW_AT_decl_line:
|
|
var->line = attr.u.val;
|
|
break;
|
|
|
|
case DW_AT_external:
|
|
if (attr.u.val != 0)
|
|
var->stack = 0;
|
|
break;
|
|
|
|
case DW_AT_location:
|
|
switch (attr.form)
|
|
{
|
|
case DW_FORM_block:
|
|
case DW_FORM_block1:
|
|
case DW_FORM_block2:
|
|
case DW_FORM_block4:
|
|
if (*attr.u.blk->data == DW_OP_addr)
|
|
{
|
|
var->stack = 0;
|
|
|
|
/* Verify that DW_OP_addr is the only opcode in the
|
|
location, in which case the block size will be 1
|
|
plus the address size. */
|
|
/* ??? For TLS variables, gcc can emit
|
|
DW_OP_addr <addr> DW_OP_GNU_push_tls_address
|
|
which we don't handle here yet. */
|
|
if (attr.u.blk->size == unit->addr_size + 1U)
|
|
var->addr = bfd_get (unit->addr_size * 8,
|
|
unit->abfd,
|
|
attr.u.blk->data + 1);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (func && high_pc != 0)
|
|
{
|
|
arange_add (unit->abfd, &func->arange, low_pc, high_pc);
|
|
}
|
|
|
|
if (abbrev->has_children)
|
|
{
|
|
nesting_level++;
|
|
|
|
if (nesting_level >= nested_funcs_size)
|
|
{
|
|
struct funcinfo **tmp;
|
|
|
|
nested_funcs_size *= 2;
|
|
tmp = bfd_realloc (nested_funcs,
|
|
(nested_funcs_size
|
|
* sizeof (struct funcinfo *)));
|
|
if (tmp == NULL)
|
|
{
|
|
free (nested_funcs);
|
|
return FALSE;
|
|
}
|
|
nested_funcs = tmp;
|
|
}
|
|
nested_funcs[nesting_level] = 0;
|
|
}
|
|
}
|
|
|
|
free (nested_funcs);
|
|
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 precedes each compilation
|
|
unit header. END_PTR points one past the end of this comp unit.
|
|
OFFSET_SIZE is the size of DWARF2 offsets (either 4 or 8 bytes).
|
|
|
|
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 (struct dwarf2_debug *stash,
|
|
bfd_vma unit_length,
|
|
bfd_byte *info_ptr_unit,
|
|
unsigned int offset_size)
|
|
{
|
|
struct comp_unit* unit;
|
|
unsigned int version;
|
|
bfd_uint64_t abbrev_offset = 0;
|
|
unsigned int addr_size;
|
|
struct abbrev_info** abbrevs;
|
|
unsigned int abbrev_number, bytes_read, i;
|
|
struct abbrev_info *abbrev;
|
|
struct attribute attr;
|
|
bfd_byte *info_ptr = stash->info_ptr;
|
|
bfd_byte *end_ptr = info_ptr + unit_length;
|
|
bfd_size_type amt;
|
|
bfd_vma low_pc = 0;
|
|
bfd_vma high_pc = 0;
|
|
bfd *abfd = stash->bfd;
|
|
|
|
version = read_2_bytes (abfd, info_ptr);
|
|
info_ptr += 2;
|
|
BFD_ASSERT (offset_size == 4 || offset_size == 8);
|
|
if (offset_size == 4)
|
|
abbrev_offset = read_4_bytes (abfd, info_ptr);
|
|
else
|
|
abbrev_offset = read_8_bytes (abfd, info_ptr);
|
|
info_ptr += offset_size;
|
|
addr_size = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
|
|
if (version != 2)
|
|
{
|
|
(*_bfd_error_handler) (_("Dwarf Error: found dwarf version '%u', 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 reader can not handle sizes greater than '%u'."),
|
|
addr_size,
|
|
(unsigned int) sizeof (bfd_vma));
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
if (addr_size != 2 && addr_size != 4 && addr_size != 8)
|
|
{
|
|
(*_bfd_error_handler) ("Dwarf Error: found address size '%u', this reader can only handle address sizes '2', '4' and '8'.", addr_size);
|
|
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, stash);
|
|
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: %u."),
|
|
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 %u."),
|
|
abbrev_number);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
amt = sizeof (struct comp_unit);
|
|
unit = bfd_zalloc (abfd, amt);
|
|
unit->abfd = abfd;
|
|
unit->addr_size = addr_size;
|
|
unit->offset_size = offset_size;
|
|
unit->abbrevs = abbrevs;
|
|
unit->end_ptr = end_ptr;
|
|
unit->stash = stash;
|
|
unit->info_ptr_unit = info_ptr_unit;
|
|
|
|
for (i = 0; i < abbrev->num_attrs; ++i)
|
|
{
|
|
info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, 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 = attr.u.val;
|
|
break;
|
|
|
|
case DW_AT_name:
|
|
unit->name = attr.u.str;
|
|
break;
|
|
|
|
case DW_AT_low_pc:
|
|
low_pc = attr.u.val;
|
|
/* If the compilation unit DIE has a DW_AT_low_pc attribute,
|
|
this is the base address to use when reading location
|
|
lists or range lists. */
|
|
unit->base_address = low_pc;
|
|
break;
|
|
|
|
case DW_AT_high_pc:
|
|
high_pc = attr.u.val;
|
|
break;
|
|
|
|
case DW_AT_ranges:
|
|
read_rangelist (unit, &unit->arange, attr.u.val);
|
|
break;
|
|
|
|
case DW_AT_comp_dir:
|
|
{
|
|
char *comp_dir = attr.u.str;
|
|
if (comp_dir)
|
|
{
|
|
/* Irix 6.2 native cc prepends <machine>.: to the compilation
|
|
directory, get rid of it. */
|
|
char *cp = strchr (comp_dir, ':');
|
|
|
|
if (cp && cp != comp_dir && cp[-1] == '.' && cp[1] == '/')
|
|
comp_dir = cp + 1;
|
|
}
|
|
unit->comp_dir = comp_dir;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
if (high_pc != 0)
|
|
{
|
|
arange_add (unit->abfd, &unit->arange, low_pc, high_pc);
|
|
}
|
|
|
|
unit->first_child_die_ptr = info_ptr;
|
|
return unit;
|
|
}
|
|
|
|
/* Return TRUE if UNIT may contain the address given by ADDR. When
|
|
there are functions written entirely with inline asm statements, the
|
|
range info in the compilation unit header may not be correct. We
|
|
need to consult the line info table to see if a compilation unit
|
|
really contains the given address. */
|
|
|
|
static bfd_boolean
|
|
comp_unit_contains_address (struct comp_unit *unit, bfd_vma addr)
|
|
{
|
|
struct arange *arange;
|
|
|
|
if (unit->error)
|
|
return FALSE;
|
|
|
|
arange = &unit->arange;
|
|
do
|
|
{
|
|
if (addr >= arange->low && addr < arange->high)
|
|
return TRUE;
|
|
arange = arange->next;
|
|
}
|
|
while (arange);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/* 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 if UNIT contains ADDR, and no errors were encountered;
|
|
FALSE otherwise. */
|
|
|
|
static bfd_boolean
|
|
comp_unit_find_nearest_line (struct comp_unit *unit,
|
|
bfd_vma addr,
|
|
const char **filename_ptr,
|
|
const char **functionname_ptr,
|
|
unsigned int *linenumber_ptr,
|
|
struct dwarf2_debug *stash)
|
|
{
|
|
bfd_boolean line_p;
|
|
bfd_boolean func_p;
|
|
struct funcinfo *function;
|
|
|
|
if (unit->error)
|
|
return FALSE;
|
|
|
|
if (! unit->line_table)
|
|
{
|
|
if (! unit->stmtlist)
|
|
{
|
|
unit->error = 1;
|
|
return FALSE;
|
|
}
|
|
|
|
unit->line_table = decode_line_info (unit, stash);
|
|
|
|
if (! unit->line_table)
|
|
{
|
|
unit->error = 1;
|
|
return FALSE;
|
|
}
|
|
|
|
if (unit->first_child_die_ptr < unit->end_ptr
|
|
&& ! scan_unit_for_symbols (unit))
|
|
{
|
|
unit->error = 1;
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
function = NULL;
|
|
func_p = lookup_address_in_function_table (unit, addr,
|
|
&function, functionname_ptr);
|
|
if (func_p && (function->tag == DW_TAG_inlined_subroutine))
|
|
stash->inliner_chain = function;
|
|
line_p = lookup_address_in_line_info_table (unit->line_table, addr,
|
|
function, filename_ptr,
|
|
linenumber_ptr);
|
|
return line_p || func_p;
|
|
}
|
|
|
|
/* Check to see if line info is already decoded in a comp_unit.
|
|
If not, decode it. Returns TRUE if no errors were encountered;
|
|
FALSE otherwise. */
|
|
|
|
static bfd_boolean
|
|
comp_unit_maybe_decode_line_info (struct comp_unit *unit,
|
|
struct dwarf2_debug *stash)
|
|
{
|
|
if (unit->error)
|
|
return FALSE;
|
|
|
|
if (! unit->line_table)
|
|
{
|
|
if (! unit->stmtlist)
|
|
{
|
|
unit->error = 1;
|
|
return FALSE;
|
|
}
|
|
|
|
unit->line_table = decode_line_info (unit, stash);
|
|
|
|
if (! unit->line_table)
|
|
{
|
|
unit->error = 1;
|
|
return FALSE;
|
|
}
|
|
|
|
if (unit->first_child_die_ptr < unit->end_ptr
|
|
&& ! scan_unit_for_symbols (unit))
|
|
{
|
|
unit->error = 1;
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* If UNIT contains SYM at ADDR, set the output parameters to the
|
|
values for the line containing SYM. The output parameters,
|
|
FILENAME_PTR, and LINENUMBER_PTR, are pointers to the objects to be
|
|
filled in.
|
|
|
|
Return TRUE if UNIT contains SYM, and no errors were encountered;
|
|
FALSE otherwise. */
|
|
|
|
static bfd_boolean
|
|
comp_unit_find_line (struct comp_unit *unit,
|
|
asymbol *sym,
|
|
bfd_vma addr,
|
|
const char **filename_ptr,
|
|
unsigned int *linenumber_ptr,
|
|
struct dwarf2_debug *stash)
|
|
{
|
|
if (!comp_unit_maybe_decode_line_info (unit, stash))
|
|
return FALSE;
|
|
|
|
if (sym->flags & BSF_FUNCTION)
|
|
return lookup_symbol_in_function_table (unit, sym, addr,
|
|
filename_ptr,
|
|
linenumber_ptr);
|
|
|
|
return lookup_symbol_in_variable_table (unit, sym, addr,
|
|
filename_ptr,
|
|
linenumber_ptr);
|
|
}
|
|
|
|
static struct funcinfo *
|
|
reverse_funcinfo_list (struct funcinfo *head)
|
|
{
|
|
struct funcinfo *rhead;
|
|
struct funcinfo *temp;
|
|
|
|
for (rhead = NULL; head; head = temp)
|
|
{
|
|
temp = head->prev_func;
|
|
head->prev_func = rhead;
|
|
rhead = head;
|
|
}
|
|
return rhead;
|
|
}
|
|
|
|
static struct varinfo *
|
|
reverse_varinfo_list (struct varinfo *head)
|
|
{
|
|
struct varinfo *rhead;
|
|
struct varinfo *temp;
|
|
|
|
for (rhead = NULL; head; head = temp)
|
|
{
|
|
temp = head->prev_var;
|
|
head->prev_var = rhead;
|
|
rhead = head;
|
|
}
|
|
return rhead;
|
|
}
|
|
|
|
/* Extract all interesting funcinfos and varinfos of a compilation
|
|
unit into hash tables for faster lookup. Returns TRUE if no
|
|
errors were enountered; FALSE otherwise. */
|
|
|
|
static bfd_boolean
|
|
comp_unit_hash_info (struct dwarf2_debug *stash,
|
|
struct comp_unit *unit,
|
|
struct info_hash_table *funcinfo_hash_table,
|
|
struct info_hash_table *varinfo_hash_table)
|
|
{
|
|
struct funcinfo* each_func;
|
|
struct varinfo* each_var;
|
|
bfd_boolean okay = TRUE;
|
|
|
|
BFD_ASSERT (stash->info_hash_status != STASH_INFO_HASH_DISABLED);
|
|
|
|
if (!comp_unit_maybe_decode_line_info (unit, stash))
|
|
return FALSE;
|
|
|
|
BFD_ASSERT (!unit->cached);
|
|
|
|
/* To preserve the original search order, we went to visit the function
|
|
infos in the reversed order of the list. However, making the list
|
|
bi-directional use quite a bit of extra memory. So we reverse
|
|
the list first, traverse the list in the now reversed order and
|
|
finally reverse the list again to get back the original order. */
|
|
unit->function_table = reverse_funcinfo_list (unit->function_table);
|
|
for (each_func = unit->function_table;
|
|
each_func && okay;
|
|
each_func = each_func->prev_func)
|
|
{
|
|
/* Skip nameless functions. */
|
|
if (each_func->name)
|
|
/* There is no need to copy name string into hash table as
|
|
name string is either in the dwarf string buffer or
|
|
info in the stash. */
|
|
okay = insert_info_hash_table (funcinfo_hash_table, each_func->name,
|
|
(void*) each_func, FALSE);
|
|
}
|
|
unit->function_table = reverse_funcinfo_list (unit->function_table);
|
|
if (!okay)
|
|
return FALSE;
|
|
|
|
/* We do the same for variable infos. */
|
|
unit->variable_table = reverse_varinfo_list (unit->variable_table);
|
|
for (each_var = unit->variable_table;
|
|
each_var && okay;
|
|
each_var = each_var->prev_var)
|
|
{
|
|
/* Skip stack vars and vars with no files or names. */
|
|
if (each_var->stack == 0
|
|
&& each_var->file != NULL
|
|
&& each_var->name != NULL)
|
|
/* There is no need to copy name string into hash table as
|
|
name string is either in the dwarf string buffer or
|
|
info in the stash. */
|
|
okay = insert_info_hash_table (varinfo_hash_table, each_var->name,
|
|
(void*) each_var, FALSE);
|
|
}
|
|
|
|
unit->variable_table = reverse_varinfo_list (unit->variable_table);
|
|
unit->cached = TRUE;
|
|
return okay;
|
|
}
|
|
|
|
/* Locate a section in a BFD containing debugging info. The search starts
|
|
from the section after AFTER_SEC, or from the first section in the BFD if
|
|
AFTER_SEC is NULL. The search works by examining the names of the
|
|
sections. There are two permissiable names. The first is .debug_info.
|
|
This is the standard DWARF2 name. The second is a prefix .gnu.linkonce.wi.
|
|
This is a variation on the .debug_info section which has a checksum
|
|
describing the contents appended onto the name. This allows the linker to
|
|
identify and discard duplicate debugging sections for different
|
|
compilation units. */
|
|
#define DWARF2_DEBUG_INFO ".debug_info"
|
|
#define GNU_LINKONCE_INFO ".gnu.linkonce.wi."
|
|
|
|
static asection *
|
|
find_debug_info (bfd *abfd, asection *after_sec)
|
|
{
|
|
asection * msec;
|
|
|
|
msec = after_sec != NULL ? after_sec->next : abfd->sections;
|
|
|
|
while (msec)
|
|
{
|
|
if (strcmp (msec->name, DWARF2_DEBUG_INFO) == 0)
|
|
return msec;
|
|
|
|
if (CONST_STRNEQ (msec->name, GNU_LINKONCE_INFO))
|
|
return msec;
|
|
|
|
msec = msec->next;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Unset vmas for loadable sections in STASH. */
|
|
|
|
static void
|
|
unset_sections (struct dwarf2_debug *stash)
|
|
{
|
|
unsigned int i;
|
|
struct loadable_section *p;
|
|
|
|
i = stash->loadable_section_count;
|
|
p = stash->loadable_sections;
|
|
for (; i > 0; i--, p++)
|
|
p->section->vma = 0;
|
|
}
|
|
|
|
/* Set unique vmas for loadable sections in ABFD and save vmas in
|
|
STASH for unset_sections. */
|
|
|
|
static bfd_boolean
|
|
place_sections (bfd *abfd, struct dwarf2_debug *stash)
|
|
{
|
|
struct loadable_section *p;
|
|
unsigned int i;
|
|
|
|
if (stash->loadable_section_count != 0)
|
|
{
|
|
i = stash->loadable_section_count;
|
|
p = stash->loadable_sections;
|
|
for (; i > 0; i--, p++)
|
|
p->section->vma = p->adj_vma;
|
|
}
|
|
else
|
|
{
|
|
asection *sect;
|
|
bfd_vma last_vma = 0;
|
|
bfd_size_type amt;
|
|
struct loadable_section *p;
|
|
|
|
i = 0;
|
|
for (sect = abfd->sections; sect != NULL; sect = sect->next)
|
|
{
|
|
bfd_size_type sz;
|
|
|
|
if (sect->vma != 0 || (sect->flags & SEC_LOAD) == 0)
|
|
continue;
|
|
|
|
sz = sect->rawsize ? sect->rawsize : sect->size;
|
|
if (sz == 0)
|
|
continue;
|
|
|
|
i++;
|
|
}
|
|
|
|
amt = i * sizeof (struct loadable_section);
|
|
p = (struct loadable_section *) bfd_zalloc (abfd, amt);
|
|
if (! p)
|
|
return FALSE;
|
|
|
|
stash->loadable_sections = p;
|
|
stash->loadable_section_count = i;
|
|
|
|
for (sect = abfd->sections; sect != NULL; sect = sect->next)
|
|
{
|
|
bfd_size_type sz;
|
|
|
|
if (sect->vma != 0 || (sect->flags & SEC_LOAD) == 0)
|
|
continue;
|
|
|
|
sz = sect->rawsize ? sect->rawsize : sect->size;
|
|
if (sz == 0)
|
|
continue;
|
|
|
|
p->section = sect;
|
|
if (last_vma != 0)
|
|
{
|
|
/* Align the new address to the current section
|
|
alignment. */
|
|
last_vma = ((last_vma
|
|
+ ~((bfd_vma) -1 << sect->alignment_power))
|
|
& ((bfd_vma) -1 << sect->alignment_power));
|
|
sect->vma = last_vma;
|
|
}
|
|
p->adj_vma = sect->vma;
|
|
last_vma += sect->vma + sz;
|
|
|
|
p++;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Look up a funcinfo by name using the given info hash table. If found,
|
|
also update the locations pointed to by filename_ptr and linenumber_ptr.
|
|
|
|
This function returns TRUE if a funcinfo that matches the given symbol
|
|
and address is found with any error; otherwise it returns FALSE. */
|
|
|
|
static bfd_boolean
|
|
info_hash_lookup_funcinfo (struct info_hash_table *hash_table,
|
|
asymbol *sym,
|
|
bfd_vma addr,
|
|
const char **filename_ptr,
|
|
unsigned int *linenumber_ptr)
|
|
{
|
|
struct funcinfo* each_func;
|
|
struct funcinfo* best_fit = NULL;
|
|
struct info_list_node *node;
|
|
struct arange *arange;
|
|
const char *name = bfd_asymbol_name (sym);
|
|
asection *sec = bfd_get_section (sym);
|
|
|
|
for (node = lookup_info_hash_table (hash_table, name);
|
|
node;
|
|
node = node->next)
|
|
{
|
|
each_func = node->info;
|
|
for (arange = &each_func->arange;
|
|
arange;
|
|
arange = arange->next)
|
|
{
|
|
if ((!each_func->sec || each_func->sec == sec)
|
|
&& addr >= arange->low
|
|
&& addr < arange->high
|
|
&& (!best_fit
|
|
|| ((arange->high - arange->low)
|
|
< (best_fit->arange.high - best_fit->arange.low))))
|
|
best_fit = each_func;
|
|
}
|
|
}
|
|
|
|
if (best_fit)
|
|
{
|
|
best_fit->sec = sec;
|
|
*filename_ptr = best_fit->file;
|
|
*linenumber_ptr = best_fit->line;
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/* Look up a varinfo by name using the given info hash table. If found,
|
|
also update the locations pointed to by filename_ptr and linenumber_ptr.
|
|
|
|
This function returns TRUE if a varinfo that matches the given symbol
|
|
and address is found with any error; otherwise it returns FALSE. */
|
|
|
|
static bfd_boolean
|
|
info_hash_lookup_varinfo (struct info_hash_table *hash_table,
|
|
asymbol *sym,
|
|
bfd_vma addr,
|
|
const char **filename_ptr,
|
|
unsigned int *linenumber_ptr)
|
|
{
|
|
const char *name = bfd_asymbol_name (sym);
|
|
asection *sec = bfd_get_section (sym);
|
|
struct varinfo* each;
|
|
struct info_list_node *node;
|
|
|
|
for (node = lookup_info_hash_table (hash_table, name);
|
|
node;
|
|
node = node->next)
|
|
{
|
|
each = node->info;
|
|
if (each->addr == addr
|
|
&& (!each->sec || each->sec == sec))
|
|
{
|
|
each->sec = sec;
|
|
*filename_ptr = each->file;
|
|
*linenumber_ptr = each->line;
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/* Update the funcinfo and varinfo info hash tables if they are
|
|
not up to date. Returns TRUE if there is no error; otherwise
|
|
returns FALSE and disable the info hash tables. */
|
|
|
|
static bfd_boolean
|
|
stash_maybe_update_info_hash_tables (struct dwarf2_debug *stash)
|
|
{
|
|
struct comp_unit *each;
|
|
|
|
/* Exit if hash tables are up-to-date. */
|
|
if (stash->all_comp_units == stash->hash_units_head)
|
|
return TRUE;
|
|
|
|
if (stash->hash_units_head)
|
|
each = stash->hash_units_head->prev_unit;
|
|
else
|
|
each = stash->last_comp_unit;
|
|
|
|
while (each)
|
|
{
|
|
if (!comp_unit_hash_info (stash, each, stash->funcinfo_hash_table,
|
|
stash->varinfo_hash_table))
|
|
{
|
|
stash->info_hash_status = STASH_INFO_HASH_DISABLED;
|
|
return FALSE;
|
|
}
|
|
each = each->prev_unit;
|
|
}
|
|
|
|
stash->hash_units_head = stash->all_comp_units;
|
|
return TRUE;
|
|
}
|
|
|
|
/* Check consistency of info hash tables. This is for debugging only. */
|
|
|
|
static void ATTRIBUTE_UNUSED
|
|
stash_verify_info_hash_table (struct dwarf2_debug *stash)
|
|
{
|
|
struct comp_unit *each_unit;
|
|
struct funcinfo *each_func;
|
|
struct varinfo *each_var;
|
|
struct info_list_node *node;
|
|
bfd_boolean found;
|
|
|
|
for (each_unit = stash->all_comp_units;
|
|
each_unit;
|
|
each_unit = each_unit->next_unit)
|
|
{
|
|
for (each_func = each_unit->function_table;
|
|
each_func;
|
|
each_func = each_func->prev_func)
|
|
{
|
|
if (!each_func->name)
|
|
continue;
|
|
node = lookup_info_hash_table (stash->funcinfo_hash_table,
|
|
each_func->name);
|
|
BFD_ASSERT (node);
|
|
found = FALSE;
|
|
while (node && !found)
|
|
{
|
|
found = node->info == each_func;
|
|
node = node->next;
|
|
}
|
|
BFD_ASSERT (found);
|
|
}
|
|
|
|
for (each_var = each_unit->variable_table;
|
|
each_var;
|
|
each_var = each_var->prev_var)
|
|
{
|
|
if (!each_var->name || !each_var->file || each_var->stack)
|
|
continue;
|
|
node = lookup_info_hash_table (stash->varinfo_hash_table,
|
|
each_var->name);
|
|
BFD_ASSERT (node);
|
|
found = FALSE;
|
|
while (node && !found)
|
|
{
|
|
found = node->info == each_var;
|
|
node = node->next;
|
|
}
|
|
BFD_ASSERT (found);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Check to see if we want to enable the info hash tables, which consume
|
|
quite a bit of memory. Currently we only check the number times
|
|
bfd_dwarf2_find_line is called. In the future, we may also want to
|
|
take the number of symbols into account. */
|
|
|
|
static void
|
|
stash_maybe_enable_info_hash_tables (bfd *abfd, struct dwarf2_debug *stash)
|
|
{
|
|
BFD_ASSERT (stash->info_hash_status == STASH_INFO_HASH_OFF);
|
|
|
|
if (stash->info_hash_count++ < STASH_INFO_HASH_TRIGGER)
|
|
return;
|
|
|
|
/* FIXME: Maybe we should check the reduce_memory_overheads
|
|
and optimize fields in the bfd_link_info structure ? */
|
|
|
|
/* Create hash tables. */
|
|
stash->funcinfo_hash_table = create_info_hash_table (abfd);
|
|
stash->varinfo_hash_table = create_info_hash_table (abfd);
|
|
if (!stash->funcinfo_hash_table || !stash->varinfo_hash_table)
|
|
{
|
|
/* Turn off info hashes if any allocation above fails. */
|
|
stash->info_hash_status = STASH_INFO_HASH_DISABLED;
|
|
return;
|
|
}
|
|
/* We need a forced update so that the info hash tables will
|
|
be created even though there is no compilation unit. That
|
|
happens if STASH_INFO_HASH_TRIGGER is 0. */
|
|
stash_maybe_update_info_hash_tables (stash);
|
|
stash->info_hash_status = STASH_INFO_HASH_ON;
|
|
}
|
|
|
|
/* Find the file and line associated with a symbol and address using the
|
|
info hash tables of a stash. If there is a match, the function returns
|
|
TRUE and update the locations pointed to by filename_ptr and linenumber_ptr;
|
|
otherwise it returns FALSE. */
|
|
|
|
static bfd_boolean
|
|
stash_find_line_fast (struct dwarf2_debug *stash,
|
|
asymbol *sym,
|
|
bfd_vma addr,
|
|
const char **filename_ptr,
|
|
unsigned int *linenumber_ptr)
|
|
{
|
|
BFD_ASSERT (stash->info_hash_status == STASH_INFO_HASH_ON);
|
|
|
|
if (sym->flags & BSF_FUNCTION)
|
|
return info_hash_lookup_funcinfo (stash->funcinfo_hash_table, sym, addr,
|
|
filename_ptr, linenumber_ptr);
|
|
return info_hash_lookup_varinfo (stash->varinfo_hash_table, sym, addr,
|
|
filename_ptr, linenumber_ptr);
|
|
}
|
|
|
|
/* Find the source code location of SYMBOL. If SYMBOL is NULL
|
|
then find the nearest source code location corresponding to
|
|
the address SECTION + OFFSET.
|
|
Returns TRUE if the line is found without error and fills in
|
|
FILENAME_PTR and LINENUMBER_PTR. In the case where SYMBOL was
|
|
NULL the FUNCTIONNAME_PTR is also filled in.
|
|
SYMBOLS contains the symbol table for ABFD.
|
|
ADDR_SIZE is the number of bytes in the initial .debug_info length
|
|
field and in the abbreviation offset, or zero to indicate that the
|
|
default value should be used. */
|
|
|
|
static bfd_boolean
|
|
find_line (bfd *abfd,
|
|
asection *section,
|
|
bfd_vma offset,
|
|
asymbol *symbol,
|
|
asymbol **symbols,
|
|
const char **filename_ptr,
|
|
const char **functionname_ptr,
|
|
unsigned int *linenumber_ptr,
|
|
unsigned int addr_size,
|
|
void **pinfo)
|
|
{
|
|
/* 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;
|
|
/* What address are we looking for? */
|
|
bfd_vma addr;
|
|
struct comp_unit* each;
|
|
bfd_vma found = FALSE;
|
|
bfd_boolean do_line;
|
|
|
|
stash = *pinfo;
|
|
|
|
if (! stash)
|
|
{
|
|
bfd_size_type amt = sizeof (struct dwarf2_debug);
|
|
|
|
stash = bfd_zalloc (abfd, amt);
|
|
if (! stash)
|
|
return FALSE;
|
|
}
|
|
|
|
/* In a relocatable file, 2 functions may have the same address.
|
|
We change the section vma so that they won't overlap. */
|
|
if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
|
|
{
|
|
if (! place_sections (abfd, stash))
|
|
return FALSE;
|
|
}
|
|
|
|
do_line = (section == NULL
|
|
&& offset == 0
|
|
&& functionname_ptr == NULL
|
|
&& symbol != NULL);
|
|
if (do_line)
|
|
{
|
|
addr = symbol->value;
|
|
section = bfd_get_section (symbol);
|
|
}
|
|
else if (section != NULL
|
|
&& functionname_ptr != NULL
|
|
&& symbol == NULL)
|
|
addr = offset;
|
|
else
|
|
abort ();
|
|
|
|
if (section->output_section)
|
|
addr += section->output_section->vma + section->output_offset;
|
|
else
|
|
addr += section->vma;
|
|
*filename_ptr = NULL;
|
|
if (! do_line)
|
|
*functionname_ptr = NULL;
|
|
*linenumber_ptr = 0;
|
|
|
|
if (! *pinfo)
|
|
{
|
|
bfd *debug_bfd;
|
|
bfd_size_type total_size;
|
|
asection *msec;
|
|
|
|
*pinfo = stash;
|
|
|
|
msec = find_debug_info (abfd, NULL);
|
|
if (msec == NULL)
|
|
{
|
|
char * debug_filename = bfd_follow_gnu_debuglink (abfd, DEBUGDIR);
|
|
|
|
if (debug_filename == NULL)
|
|
/* No dwarf2 info, and no gnu_debuglink to follow.
|
|
Note that at this point the stash has been allocated, but
|
|
contains zeros. This lets future calls to this function
|
|
fail more quickly. */
|
|
goto done;
|
|
|
|
if ((debug_bfd = bfd_openr (debug_filename, NULL)) == NULL
|
|
|| ! bfd_check_format (debug_bfd, bfd_object)
|
|
|| (msec = find_debug_info (debug_bfd, NULL)) == NULL)
|
|
{
|
|
if (debug_bfd)
|
|
bfd_close (debug_bfd);
|
|
/* FIXME: Should we report our failure to follow the debuglink ? */
|
|
free (debug_filename);
|
|
goto done;
|
|
}
|
|
}
|
|
else
|
|
debug_bfd = abfd;
|
|
|
|
/* There can be more than one DWARF2 info section in a BFD these days.
|
|
Read them all in and produce one large stash. We do this in two
|
|
passes - in the first pass we just accumulate the section sizes.
|
|
In the second pass we read in the section's contents. The allows
|
|
us to avoid reallocing the data as we add sections to the stash. */
|
|
for (total_size = 0; msec; msec = find_debug_info (debug_bfd, msec))
|
|
total_size += msec->size;
|
|
|
|
stash->info_ptr = bfd_alloc (debug_bfd, total_size);
|
|
if (stash->info_ptr == NULL)
|
|
goto done;
|
|
|
|
stash->info_ptr_end = stash->info_ptr;
|
|
|
|
for (msec = find_debug_info (debug_bfd, NULL);
|
|
msec;
|
|
msec = find_debug_info (debug_bfd, msec))
|
|
{
|
|
bfd_size_type size;
|
|
bfd_size_type start;
|
|
|
|
size = msec->size;
|
|
if (size == 0)
|
|
continue;
|
|
|
|
start = stash->info_ptr_end - stash->info_ptr;
|
|
|
|
if ((bfd_simple_get_relocated_section_contents
|
|
(debug_bfd, msec, stash->info_ptr + start, symbols)) == NULL)
|
|
continue;
|
|
|
|
stash->info_ptr_end = stash->info_ptr + start + size;
|
|
}
|
|
|
|
BFD_ASSERT (stash->info_ptr_end == stash->info_ptr + total_size);
|
|
|
|
stash->sec = find_debug_info (debug_bfd, NULL);
|
|
stash->sec_info_ptr = stash->info_ptr;
|
|
stash->syms = symbols;
|
|
stash->bfd = debug_bfd;
|
|
}
|
|
|
|
/* 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)
|
|
goto done;
|
|
|
|
stash->inliner_chain = NULL;
|
|
|
|
/* Check the previously read comp. units first. */
|
|
if (do_line)
|
|
{
|
|
/* The info hash tables use quite a bit of memory. We may not want to
|
|
always use them. We use some heuristics to decide if and when to
|
|
turn it on. */
|
|
if (stash->info_hash_status == STASH_INFO_HASH_OFF)
|
|
stash_maybe_enable_info_hash_tables (abfd, stash);
|
|
|
|
/* Keep info hash table up to date if they are available. Note that we
|
|
may disable the hash tables if there is any error duing update. */
|
|
if (stash->info_hash_status == STASH_INFO_HASH_ON)
|
|
stash_maybe_update_info_hash_tables (stash);
|
|
|
|
if (stash->info_hash_status == STASH_INFO_HASH_ON)
|
|
{
|
|
found = stash_find_line_fast (stash, symbol, addr, filename_ptr,
|
|
linenumber_ptr);
|
|
if (found)
|
|
goto done;
|
|
}
|
|
else
|
|
{
|
|
/* Check the previously read comp. units first. */
|
|
for (each = stash->all_comp_units; each; each = each->next_unit)
|
|
if ((symbol->flags & BSF_FUNCTION) == 0
|
|
|| comp_unit_contains_address (each, addr))
|
|
{
|
|
found = comp_unit_find_line (each, symbol, addr, filename_ptr,
|
|
linenumber_ptr, stash);
|
|
if (found)
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (each = stash->all_comp_units; each; each = each->next_unit)
|
|
{
|
|
found = (comp_unit_contains_address (each, addr)
|
|
&& comp_unit_find_nearest_line (each, addr,
|
|
filename_ptr,
|
|
functionname_ptr,
|
|
linenumber_ptr,
|
|
stash));
|
|
if (found)
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/* The DWARF2 spec says that the initial length field, and the
|
|
offset of the abbreviation table, should both be 4-byte values.
|
|
However, some compilers do things differently. */
|
|
if (addr_size == 0)
|
|
addr_size = 4;
|
|
BFD_ASSERT (addr_size == 4 || addr_size == 8);
|
|
|
|
/* Read each remaining comp. units checking each as they are read. */
|
|
while (stash->info_ptr < stash->info_ptr_end)
|
|
{
|
|
bfd_vma length;
|
|
unsigned int offset_size = addr_size;
|
|
bfd_byte *info_ptr_unit = stash->info_ptr;
|
|
|
|
length = read_4_bytes (stash->bfd, stash->info_ptr);
|
|
/* A 0xffffff length is the DWARF3 way of indicating
|
|
we use 64-bit offsets, instead of 32-bit offsets. */
|
|
if (length == 0xffffffff)
|
|
{
|
|
offset_size = 8;
|
|
length = read_8_bytes (stash->bfd, stash->info_ptr + 4);
|
|
stash->info_ptr += 12;
|
|
}
|
|
/* A zero length is the IRIX way of indicating 64-bit offsets,
|
|
mostly because the 64-bit length will generally fit in 32
|
|
bits, and the endianness helps. */
|
|
else if (length == 0)
|
|
{
|
|
offset_size = 8;
|
|
length = read_4_bytes (stash->bfd, stash->info_ptr + 4);
|
|
stash->info_ptr += 8;
|
|
}
|
|
/* In the absence of the hints above, we assume 32-bit DWARF2
|
|
offsets even for targets with 64-bit addresses, because:
|
|
a) most of the time these targets will not have generated
|
|
more than 2Gb of debug info and so will not need 64-bit
|
|
offsets,
|
|
and
|
|
b) if they do use 64-bit offsets but they are not using
|
|
the size hints that are tested for above then they are
|
|
not conforming to the DWARF3 standard anyway. */
|
|
else if (addr_size == 8)
|
|
{
|
|
offset_size = 4;
|
|
stash->info_ptr += 4;
|
|
}
|
|
else
|
|
stash->info_ptr += 4;
|
|
|
|
if (length > 0)
|
|
{
|
|
each = parse_comp_unit (stash, length, info_ptr_unit,
|
|
offset_size);
|
|
stash->info_ptr += length;
|
|
|
|
if ((bfd_vma) (stash->info_ptr - stash->sec_info_ptr)
|
|
== stash->sec->size)
|
|
{
|
|
stash->sec = find_debug_info (stash->bfd, stash->sec);
|
|
stash->sec_info_ptr = stash->info_ptr;
|
|
}
|
|
|
|
if (each)
|
|
{
|
|
if (stash->all_comp_units)
|
|
stash->all_comp_units->prev_unit = each;
|
|
else
|
|
stash->last_comp_unit = each;
|
|
|
|
each->next_unit = stash->all_comp_units;
|
|
stash->all_comp_units = each;
|
|
|
|
/* DW_AT_low_pc and DW_AT_high_pc are optional for
|
|
compilation units. If we don't have them (i.e.,
|
|
unit->high == 0), we need to consult the line info
|
|
table to see if a compilation unit contains the given
|
|
address. */
|
|
if (do_line)
|
|
found = (((symbol->flags & BSF_FUNCTION) == 0
|
|
|| each->arange.high == 0
|
|
|| comp_unit_contains_address (each, addr))
|
|
&& comp_unit_find_line (each, symbol, addr,
|
|
filename_ptr,
|
|
linenumber_ptr,
|
|
stash));
|
|
else
|
|
found = ((each->arange.high == 0
|
|
|| comp_unit_contains_address (each, addr))
|
|
&& comp_unit_find_nearest_line (each, addr,
|
|
filename_ptr,
|
|
functionname_ptr,
|
|
linenumber_ptr,
|
|
stash));
|
|
if (found)
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
|
|
done:
|
|
if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
|
|
unset_sections (stash);
|
|
|
|
return found;
|
|
}
|
|
|
|
/* The DWARF2 version of find_nearest_line.
|
|
Return TRUE if the line is found without error. */
|
|
|
|
bfd_boolean
|
|
_bfd_dwarf2_find_nearest_line (bfd *abfd,
|
|
asection *section,
|
|
asymbol **symbols,
|
|
bfd_vma offset,
|
|
const char **filename_ptr,
|
|
const char **functionname_ptr,
|
|
unsigned int *linenumber_ptr,
|
|
unsigned int addr_size,
|
|
void **pinfo)
|
|
{
|
|
return find_line (abfd, section, offset, NULL, symbols, filename_ptr,
|
|
functionname_ptr, linenumber_ptr, addr_size,
|
|
pinfo);
|
|
}
|
|
|
|
/* The DWARF2 version of find_line.
|
|
Return TRUE if the line is found without error. */
|
|
|
|
bfd_boolean
|
|
_bfd_dwarf2_find_line (bfd *abfd,
|
|
asymbol **symbols,
|
|
asymbol *symbol,
|
|
const char **filename_ptr,
|
|
unsigned int *linenumber_ptr,
|
|
unsigned int addr_size,
|
|
void **pinfo)
|
|
{
|
|
return find_line (abfd, NULL, 0, symbol, symbols, filename_ptr,
|
|
NULL, linenumber_ptr, addr_size,
|
|
pinfo);
|
|
}
|
|
|
|
bfd_boolean
|
|
_bfd_dwarf2_find_inliner_info (bfd *abfd ATTRIBUTE_UNUSED,
|
|
const char **filename_ptr,
|
|
const char **functionname_ptr,
|
|
unsigned int *linenumber_ptr,
|
|
void **pinfo)
|
|
{
|
|
struct dwarf2_debug *stash;
|
|
|
|
stash = *pinfo;
|
|
if (stash)
|
|
{
|
|
struct funcinfo *func = stash->inliner_chain;
|
|
|
|
if (func && func->caller_func)
|
|
{
|
|
*filename_ptr = func->caller_file;
|
|
*functionname_ptr = func->caller_func->name;
|
|
*linenumber_ptr = func->caller_line;
|
|
stash->inliner_chain = func->caller_func;
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
void
|
|
_bfd_dwarf2_cleanup_debug_info (bfd *abfd)
|
|
{
|
|
struct comp_unit *each;
|
|
struct dwarf2_debug *stash;
|
|
|
|
if (abfd == NULL || elf_tdata (abfd) == NULL)
|
|
return;
|
|
|
|
stash = elf_tdata (abfd)->dwarf2_find_line_info;
|
|
|
|
if (stash == NULL)
|
|
return;
|
|
|
|
for (each = stash->all_comp_units; each; each = each->next_unit)
|
|
{
|
|
struct abbrev_info **abbrevs = each->abbrevs;
|
|
size_t i;
|
|
|
|
for (i = 0; i < ABBREV_HASH_SIZE; i++)
|
|
{
|
|
struct abbrev_info *abbrev = abbrevs[i];
|
|
|
|
while (abbrev)
|
|
{
|
|
free (abbrev->attrs);
|
|
abbrev = abbrev->next;
|
|
}
|
|
}
|
|
|
|
if (each->line_table)
|
|
{
|
|
free (each->line_table->dirs);
|
|
free (each->line_table->files);
|
|
}
|
|
}
|
|
|
|
free (stash->dwarf_abbrev_buffer);
|
|
free (stash->dwarf_line_buffer);
|
|
free (stash->dwarf_ranges_buffer);
|
|
}
|