diff options
Diffstat (limited to 'gas/dwarf2dbg.c')
| -rw-r--r-- | gas/dwarf2dbg.c | 1312 |
1 files changed, 0 insertions, 1312 deletions
diff --git a/gas/dwarf2dbg.c b/gas/dwarf2dbg.c deleted file mode 100644 index a2d266e71b0..00000000000 --- a/gas/dwarf2dbg.c +++ /dev/null @@ -1,1312 +0,0 @@ -/* dwarf2dbg.c - DWARF2 debug support - Copyright 1999, 2000, 2001 Free Software Foundation, Inc. - Contributed by David Mosberger-Tang <davidm@hpl.hp.com> - - This file is part of GAS, the GNU Assembler. - - GAS is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - GAS is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with GAS; see the file COPYING. If not, write to the Free - Software Foundation, 59 Temple Place - Suite 330, Boston, MA - 02111-1307, USA. */ - -/* Logical line numbers can be controlled by the compiler via the - following two directives: - - .file FILENO "file.c" - .loc FILENO LINENO [COLUMN] - - FILENO is the filenumber. */ - -#include "ansidecl.h" -#include "as.h" - -#ifdef HAVE_LIMITS_H -#include <limits.h> -#else -#ifdef HAVE_SYS_PARAM_H -#include <sys/param.h> -#endif -#ifndef INT_MAX -#define INT_MAX (int) (((unsigned) (-1)) >> 1) -#endif -#endif - -#ifdef BFD_ASSEMBLER - -#include "dwarf2dbg.h" -#include "subsegs.h" - -#include "elf/dwarf2.h" - -/* Since we can't generate the prolog until the body is complete, we - use three different subsegments for .debug_line: one holding the - prolog, one for the directory and filename info, and one for the - body ("statement program"). */ -#define DL_PROLOG 0 -#define DL_FILES 1 -#define DL_BODY 2 - -/* First special line opcde - leave room for the standard opcodes. - Note: If you want to change this, you'll have to update the - "standard_opcode_lengths" table that is emitted below in - dwarf2_finish(). */ -#define DWARF2_LINE_OPCODE_BASE 10 - -#ifndef DWARF2_LINE_BASE - /* Minimum line offset in a special line info. opcode. This value - was chosen to give a reasonable range of values. */ -# define DWARF2_LINE_BASE -5 -#endif - -/* Range of line offsets in a special line info. opcode. */ -#ifndef DWARF2_LINE_RANGE -# define DWARF2_LINE_RANGE 14 -#endif - -#ifndef DWARF2_LINE_MIN_INSN_LENGTH - /* Define the architecture-dependent minimum instruction length (in - bytes). This value should be rather too small than too big. */ -# define DWARF2_LINE_MIN_INSN_LENGTH 1 -#endif - -/* Flag that indicates the initial value of the is_stmt_start flag. - In the present implementation, we do not mark any lines as - the beginning of a source statement, because that information - is not made available by the GCC front-end. */ -#define DWARF2_LINE_DEFAULT_IS_STMT 1 - -/* Given a special op, return the line skip amount. */ -#define SPECIAL_LINE(op) \ - (((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE) - -/* Given a special op, return the address skip amount (in units of - DWARF2_LINE_MIN_INSN_LENGTH. */ -#define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE) - -/* The maximum address skip amount that can be encoded with a special op. */ -#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255) - -struct line_entry { - struct line_entry *next; - fragS *frag; - addressT frag_ofs; - struct dwarf2_line_info loc; -}; - -struct line_subseg { - struct line_subseg *next; - subsegT subseg; - struct line_entry *head; - struct line_entry **ptail; -}; - -struct line_seg { - struct line_seg *next; - segT seg; - struct line_subseg *head; - symbolS *text_start; - symbolS *text_end; -}; - -/* Collects data for all line table entries during assembly. */ -static struct line_seg *all_segs; - -struct file_entry { - char *filename; - unsigned int dir; -}; - -/* Table of files used by .debug_line. */ -static struct file_entry *files; -static unsigned int files_in_use; -static unsigned int files_allocated; - -/* True when we've seen a .loc directive recently. Used to avoid - doing work when there's nothing to do. */ -static boolean loc_directive_seen; - -/* Current location as indicated by the most recent .loc directive. */ -static struct dwarf2_line_info current; - -/* Fake label name. */ -static char const fake_label_name[] = ".L0\001"; - -/* The size of an address on the target. */ -static unsigned int sizeof_address; - -static struct line_subseg *get_line_subseg PARAMS ((segT, subsegT)); -static unsigned int get_filenum PARAMS ((const char *)); -static struct frag *first_frag_for_seg PARAMS ((segT)); -static struct frag *last_frag_for_seg PARAMS ((segT)); -static void out_byte PARAMS ((int)); -static void out_opcode PARAMS ((int)); -static void out_two PARAMS ((int)); -static void out_four PARAMS ((int)); -static void out_abbrev PARAMS ((int, int)); -static void out_uleb128 PARAMS ((addressT)); -static symbolS *symbol_new_now PARAMS ((void)); -static void set_symbol_value_now PARAMS ((symbolS *)); -static offsetT get_frag_fix PARAMS ((fragS *)); -static void out_set_addr PARAMS ((segT, fragS *, addressT)); -static int size_inc_line_addr PARAMS ((int, addressT)); -static void emit_inc_line_addr PARAMS ((int, addressT, char *, int)); -static void out_inc_line_addr PARAMS ((int, addressT)); -static void relax_inc_line_addr PARAMS ((int, segT, fragS *, addressT, - fragS *, addressT)); -static void process_entries PARAMS ((segT, struct line_entry *)); -static void out_file_list PARAMS ((void)); -static void out_debug_line PARAMS ((segT)); -static void out_debug_aranges PARAMS ((segT, segT)); -static void out_debug_abbrev PARAMS ((segT)); -static void out_debug_info PARAMS ((segT, segT, segT)); - -/* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */ - -static struct line_subseg * -get_line_subseg (seg, subseg) - segT seg; - subsegT subseg; -{ - static segT last_seg; - static subsegT last_subseg; - static struct line_subseg *last_line_subseg; - - struct line_seg *s; - struct line_subseg **pss, *ss; - - if (seg == last_seg && subseg == last_subseg) - return last_line_subseg; - - for (s = all_segs; s; s = s->next) - if (s->seg == seg) - goto found_seg; - - s = (struct line_seg *) xmalloc (sizeof (*s)); - s->next = all_segs; - s->seg = seg; - s->head = NULL; - all_segs = s; - - found_seg: - for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next) - { - if (ss->subseg == subseg) - goto found_subseg; - if (ss->subseg > subseg) - break; - } - - ss = (struct line_subseg *) xmalloc (sizeof (*ss)); - ss->next = *pss; - ss->subseg = subseg; - ss->head = NULL; - ss->ptail = &ss->head; - *pss = ss; - - found_subseg: - last_seg = seg; - last_subseg = subseg; - last_line_subseg = ss; - - return ss; -} - -/* Record an entry for LOC ocurring at OFS within the current fragment. */ - -void -dwarf2_gen_line_info (ofs, loc) - addressT ofs; - struct dwarf2_line_info *loc; -{ - struct line_subseg *ss; - struct line_entry *e; - - /* Early out for as-yet incomplete location information. */ - if (loc->filenum == 0 || loc->line == 0) - return; - - e = (struct line_entry *) xmalloc (sizeof (*e)); - e->next = NULL; - e->frag = frag_now; - e->frag_ofs = ofs; - e->loc = *loc; - - ss = get_line_subseg (now_seg, now_subseg); - *ss->ptail = e; - ss->ptail = &e->next; -} - -void -dwarf2_where (line) - struct dwarf2_line_info *line; -{ - if (debug_type == DEBUG_DWARF2) - { - char *filename; - as_where (&filename, &line->line); - line->filenum = get_filenum (filename); - line->column = 0; - line->flags = DWARF2_FLAG_BEGIN_STMT; - } - else - *line = current; -} - -/* Called for each machine instruction, or relatively atomic group of - machine instructions (ie built-in macro). The instruction or group - is SIZE bytes in length. If dwarf2 line number generation is called - for, emit a line statement appropriately. */ - -void -dwarf2_emit_insn (size) - int size; -{ - struct dwarf2_line_info loc; - - if (debug_type != DEBUG_DWARF2 && ! loc_directive_seen) - return; - loc_directive_seen = false; - - dwarf2_where (&loc); - dwarf2_gen_line_info (frag_now_fix () - size, &loc); -} - -/* Get a .debug_line file number for FILENAME. */ - -static unsigned int -get_filenum (filename) - const char *filename; -{ - static unsigned int last_used; - unsigned int i; - - if (last_used) - if (strcmp (filename, files[last_used].filename) == 0) - return last_used; - - for (i = 1; i < files_in_use; ++i) - if (strcmp (filename, files[i].filename) == 0) - return i; - - if (i >= files_allocated) - { - unsigned int old = files_allocated; - - files_allocated = i + 32; - files = (struct file_entry *) - xrealloc (files, (i + 32) * sizeof (struct file_entry)); - - memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); - } - - files[i].filename = xstrdup (filename); - files[i].dir = 0; - files_in_use = i + 1; - last_used = i; - - return i; -} - -/* Handle the .file directive. */ - -void -dwarf2_directive_file (dummy) - int dummy ATTRIBUTE_UNUSED; -{ - offsetT num; - char *filename; - int filename_len; - - /* Continue to accept a bare string and pass it off. */ - SKIP_WHITESPACE (); - if (*input_line_pointer == '"') - { - s_app_file (0); - return; - } - - num = get_absolute_expression (); - filename = demand_copy_C_string (&filename_len); - demand_empty_rest_of_line (); - - if (num < 1) - { - as_bad (_("File number less than one")); - return; - } - - if (num < files_in_use && files[num].filename != 0) - { - as_bad (_("File number %ld already allocated"), (long) num); - return; - } - - if (num >= (int) files_allocated) - { - unsigned int old = files_allocated; - - files_allocated = num + 16; - files = (struct file_entry *) - xrealloc (files, (num + 16) * sizeof (struct file_entry)); - - /* Zero the new memory. */ - memset (files + old, 0, (num + 16 - old) * sizeof (struct file_entry)); - } - - files[num].filename = filename; - files[num].dir = 0; - files_in_use = num + 1; -} - -void -dwarf2_directive_loc (dummy) - int dummy ATTRIBUTE_UNUSED; -{ - offsetT filenum, line, column; - - filenum = get_absolute_expression (); - SKIP_WHITESPACE (); - line = get_absolute_expression (); - SKIP_WHITESPACE (); - column = get_absolute_expression (); - demand_empty_rest_of_line (); - - if (filenum < 1) - { - as_bad (_("File number less than one")); - return; - } - if (filenum >= (int) files_in_use || files[filenum].filename == 0) - { - as_bad (_("Unassigned file number %ld"), (long) filenum); - return; - } - - current.filenum = filenum; - current.line = line; - current.column = column; - current.flags = DWARF2_FLAG_BEGIN_STMT; - - loc_directive_seen = true; - -#ifndef NO_LISTING - if (listing) - listing_source_line (line); -#endif -} - -static struct frag * -first_frag_for_seg (seg) - segT seg; -{ - frchainS *f, *first = NULL; - - for (f = frchain_root; f; f = f->frch_next) - if (f->frch_seg == seg - && (! first || first->frch_subseg > f->frch_subseg)) - first = f; - - return first ? first->frch_root : NULL; -} - -static struct frag * -last_frag_for_seg (seg) - segT seg; -{ - frchainS *f, *last = NULL; - - for (f = frchain_root; f; f = f->frch_next) - if (f->frch_seg == seg - && (! last || last->frch_subseg < f->frch_subseg)) - last= f; - - return last ? last->frch_last : NULL; -} - -/* Emit a single byte into the current segment. */ - -static inline void -out_byte (byte) - int byte; -{ - FRAG_APPEND_1_CHAR (byte); -} - -/* Emit a statement program opcode into the current segment. */ - -static inline void -out_opcode (opc) - int opc; -{ - out_byte (opc); -} - -/* Emit a two-byte word into the current segment. */ - -static inline void -out_two (data) - int data; -{ - md_number_to_chars (frag_more (2), data, 2); -} - -/* Emit a four byte word into the current segment. */ - -static inline void -out_four (data) - int data; -{ - md_number_to_chars (frag_more (4), data, 4); -} - -/* Emit an unsigned "little-endian base 128" number. */ - -static void -out_uleb128 (value) - addressT value; -{ - output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); -} - -/* Emit a tuple for .debug_abbrev. */ - -static inline void -out_abbrev (name, form) - int name, form; -{ - out_uleb128 (name); - out_uleb128 (form); -} - -/* Create a new fake symbol whose value is the current position. */ - -static symbolS * -symbol_new_now () -{ - return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now); -} - -/* Set the value of SYM to the current position in the current segment. */ - -static void -set_symbol_value_now (sym) - symbolS *sym; -{ - S_SET_SEGMENT (sym, now_seg); - S_SET_VALUE (sym, frag_now_fix ()); - symbol_set_frag (sym, frag_now); -} - -/* Get the size of a fragment. */ - -static offsetT -get_frag_fix (frag) - fragS *frag; -{ - frchainS *fr; - - if (frag->fr_next) - return frag->fr_fix; - - /* If a fragment is the last in the chain, special measures must be - taken to find its size before relaxation, since it may be pending - on some subsegment chain. */ - for (fr = frchain_root; fr; fr = fr->frch_next) - if (fr->frch_last == frag) - { - return ((char *) obstack_next_free (&fr->frch_obstack) - - frag->fr_literal); - } - - abort (); -} - -/* Set an absolute address (may result in a relocation entry). */ - -static void -out_set_addr (seg, frag, ofs) - segT seg; - fragS *frag; - addressT ofs; -{ - expressionS expr; - symbolS *sym; - - sym = symbol_new (fake_label_name, seg, ofs, frag); - - out_opcode (DW_LNS_extended_op); - out_uleb128 (sizeof_address + 1); - - out_opcode (DW_LNE_set_address); - expr.X_op = O_symbol; - expr.X_add_symbol = sym; - expr.X_add_number = 0; - emit_expr (&expr, sizeof_address); -} - -/* Encode a pair of line and address skips as efficiently as possible. - Note that the line skip is signed, whereas the address skip is unsigned. - - The following two routines *must* be kept in sync. This is - enforced by making emit_inc_line_addr abort if we do not emit - exactly the expected number of bytes. */ - -static int -size_inc_line_addr (line_delta, addr_delta) - int line_delta; - addressT addr_delta; -{ - unsigned int tmp, opcode; - int len = 0; - - /* Scale the address delta by the minimum instruction length. */ -#if DWARF2_LINE_MIN_INSN_LENGTH > 1 - assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); - addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; -#endif - - /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. - We cannot use special opcodes here, since we want the end_sequence - to emit the matrix entry. */ - if (line_delta == INT_MAX) - { - if (addr_delta == MAX_SPECIAL_ADDR_DELTA) - len = 1; - else - len = 1 + sizeof_leb128 (addr_delta, 0); - return len + 3; - } - - /* Bias the line delta by the base. */ - tmp = line_delta - DWARF2_LINE_BASE; - - /* If the line increment is out of range of a special opcode, we - must encode it with DW_LNS_advance_line. */ - if (tmp >= DWARF2_LINE_RANGE) - { - len = 1 + sizeof_leb128 (line_delta, 1); - line_delta = 0; - tmp = 0 - DWARF2_LINE_BASE; - } - - /* Bias the opcode by the special opcode base. */ - tmp += DWARF2_LINE_OPCODE_BASE; - - /* Avoid overflow when addr_delta is large. */ - if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) - { - /* Try using a special opcode. */ - opcode = tmp + addr_delta * DWARF2_LINE_RANGE; - if (opcode <= 255) - return len + 1; - - /* Try using DW_LNS_const_add_pc followed by special op. */ - opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; - if (opcode <= 255) - return len + 2; - } - - /* Otherwise use DW_LNS_advance_pc. */ - len += 1 + sizeof_leb128 (addr_delta, 0); - - /* DW_LNS_copy or special opcode. */ - len += 1; - - return len; -} - -static void -emit_inc_line_addr (line_delta, addr_delta, p, len) - int line_delta; - addressT addr_delta; - char *p; - int len; -{ - unsigned int tmp, opcode; - int need_copy = 0; - char *end = p + len; - -#if DWARF2_LINE_MIN_INSN_LENGTH > 1 - /* Scale the address delta by the minimum instruction length. */ - assert (addr_delta % DWARF2_LINE_MIN_INSN_LENGTH == 0); - addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH; -#endif - /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. - We cannot use special opcodes here, since we want the end_sequence - to emit the matrix entry. */ - if (line_delta == INT_MAX) - { - if (addr_delta == MAX_SPECIAL_ADDR_DELTA) - *p++ = DW_LNS_const_add_pc; - else - { - *p++ = DW_LNS_advance_pc; - p += output_leb128 (p, addr_delta, 0); - } - - *p++ = DW_LNS_extended_op; - *p++ = 1; - *p++ = DW_LNE_end_sequence; - goto done; - } - - /* Bias the line delta by the base. */ - tmp = line_delta - DWARF2_LINE_BASE; - - /* If the line increment is out of range of a special opcode, we - must encode it with DW_LNS_advance_line. */ - if (tmp >= DWARF2_LINE_RANGE) - { - *p++ = DW_LNS_advance_line; - p += output_leb128 (p, line_delta, 1); - - /* Prettier, I think, to use DW_LNS_copy instead of a - "line +0, addr +0" special opcode. */ - if (addr_delta == 0) - { - *p++ = DW_LNS_copy; - goto done; - } - - line_delta = 0; - tmp = 0 - DWARF2_LINE_BASE; - need_copy = 1; - } - - /* Bias the opcode by the special opcode base. */ - tmp += DWARF2_LINE_OPCODE_BASE; - - /* Avoid overflow when addr_delta is large. */ - if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA) - { - /* Try using a special opcode. */ - opcode = tmp + addr_delta * DWARF2_LINE_RANGE; - if (opcode <= 255) - { - *p++ = opcode; - goto done; - } - - /* Try using DW_LNS_const_add_pc followed by special op. */ - opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE; - if (opcode <= 255) - { - *p++ = DW_LNS_const_add_pc; - *p++ = opcode; - goto done; - } - } - - /* Otherwise use DW_LNS_advance_pc. */ - *p++ = DW_LNS_advance_pc; - p += output_leb128 (p, addr_delta, 0); - - if (need_copy) - *p++ = DW_LNS_copy; - else - *p++ = tmp; - - done: - assert (p == end); -} - -/* Handy routine to combine calls to the above two routines. */ - -static void -out_inc_line_addr (line_delta, addr_delta) - int line_delta; - addressT addr_delta; -{ - int len = size_inc_line_addr (line_delta, addr_delta); - emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); -} - -/* Generate a variant frag that we can use to relax address/line - increments between fragments of the target segment. */ - -static void -relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) - int line_delta; - segT seg; - fragS *to_frag, *from_frag; - addressT to_ofs, from_ofs; -{ - symbolS *to_sym, *from_sym; - expressionS expr; - int max_chars; - - to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag); - from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag); - - expr.X_op = O_subtract; - expr.X_add_symbol = to_sym; - expr.X_op_symbol = from_sym; - expr.X_add_number = 0; - - /* The maximum size of the frag is the line delta with a maximum - sized address delta. */ - max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); - - frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, - make_expr_symbol (&expr), line_delta, NULL); -} - -/* The function estimates the size of a rs_dwarf2dbg variant frag - based on the current values of the symbols. It is called before - the relaxation loop. We set fr_subtype to the expected length. */ - -int -dwarf2dbg_estimate_size_before_relax (frag) - fragS *frag; -{ - offsetT addr_delta; - int size; - - addr_delta = resolve_symbol_value (frag->fr_symbol); - size = size_inc_line_addr (frag->fr_offset, addr_delta); - - frag->fr_subtype = size; - - return size; -} - -/* This function relaxes a rs_dwarf2dbg variant frag based on the - current values of the symbols. fr_subtype is the current length - of the frag. This returns the change in frag length. */ - -int -dwarf2dbg_relax_frag (frag) - fragS *frag; -{ - int old_size, new_size; - - old_size = frag->fr_subtype; - new_size = dwarf2dbg_estimate_size_before_relax (frag); - - return new_size - old_size; -} - -/* This function converts a rs_dwarf2dbg variant frag into a normal - fill frag. This is called after all relaxation has been done. - fr_subtype will be the desired length of the frag. */ - -void -dwarf2dbg_convert_frag (frag) - fragS *frag; -{ - offsetT addr_diff; - - addr_diff = resolve_symbol_value (frag->fr_symbol); - - /* fr_var carries the max_chars that we created the fragment with. - fr_subtype carries the current expected length. We must, of - course, have allocated enough memory earlier. */ - assert (frag->fr_var >= (int) frag->fr_subtype); - - emit_inc_line_addr (frag->fr_offset, addr_diff, - frag->fr_literal + frag->fr_fix, frag->fr_subtype); - - frag->fr_fix += frag->fr_subtype; - frag->fr_type = rs_fill; - frag->fr_var = 0; - frag->fr_offset = 0; -} - -/* Generate .debug_line content for the chain of line number entries - beginning at E, for segment SEG. */ - -static void -process_entries (seg, e) - segT seg; - struct line_entry *e; -{ - unsigned filenum = 1; - unsigned line = 1; - unsigned column = 0; - unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0; - fragS *frag = NULL; - fragS *last_frag; - addressT frag_ofs = 0; - addressT last_frag_ofs; - struct line_entry *next; - - while (e) - { - int changed = 0; - - if (filenum != e->loc.filenum) - { - filenum = e->loc.filenum; - out_opcode (DW_LNS_set_file); - out_uleb128 (filenum); - changed = 1; - } - - if (column != e->loc.column) - { - column = e->loc.column; - out_opcode (DW_LNS_set_column); - out_uleb128 (column); - changed = 1; - } - - if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) - { - flags = e->loc.flags; - out_opcode (DW_LNS_negate_stmt); - changed = 1; - } - - if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK) - { - out_opcode (DW_LNS_set_basic_block); - changed = 1; - } - - /* Don't try to optimize away redundant entries; gdb wants two - entries for a function where the code starts on the same line as - the {, and there's no way to identify that case here. Trust gcc - to optimize appropriately. */ - if (1 /* line != e->loc.line || changed */) - { - int line_delta = e->loc.line - line; - if (frag == NULL) - { - out_set_addr (seg, e->frag, e->frag_ofs); - out_inc_line_addr (line_delta, 0); - } - else if (frag == e->frag) - out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); - else - relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, - frag, frag_ofs); - - frag = e->frag; - frag_ofs = e->frag_ofs; - line = e->loc.line; - } - else if (frag == NULL) - { - out_set_addr (seg, e->frag, e->frag_ofs); - frag = e->frag; - frag_ofs = e->frag_ofs; - } - - next = e->next; - free (e); - e = next; - } - - /* Emit a DW_LNE_end_sequence for the end of the section. */ - last_frag = last_frag_for_seg (seg); - last_frag_ofs = get_frag_fix (last_frag); - if (frag == last_frag) - out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); - else - relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, - frag, frag_ofs); -} - -/* Emit the directory and file tables for .debug_line. */ - -static void -out_file_list () -{ - size_t size; - char *cp; - unsigned int i; - - /* Terminate directory list. */ - out_byte ('\0'); - - for (i = 1; i < files_in_use; ++i) - { - if (files[i].filename == NULL) - { - as_bad (_("Unassigned file number %u"), i); - continue; - } - - size = strlen (files[i].filename) + 1; - cp = frag_more (size); - memcpy (cp, files[i].filename, size); - - out_uleb128 (files[i].dir); /* directory number */ - out_uleb128 (0); /* last modification timestamp */ - out_uleb128 (0); /* filesize */ - } - - /* Terminate filename list. */ - out_byte (0); -} - -/* Emit the collected .debug_line data. */ - -static void -out_debug_line (line_seg) - segT line_seg; -{ - expressionS expr; - symbolS *line_start; - symbolS *prologue_end; - symbolS *line_end; - struct line_seg *s; - - subseg_set (line_seg, 0); - - line_start = symbol_new_now (); - prologue_end = symbol_make (fake_label_name); - line_end = symbol_make (fake_label_name); - - /* Total length of the information for this compilation unit. */ - expr.X_op = O_subtract; - expr.X_add_symbol = line_end; - expr.X_op_symbol = line_start; - expr.X_add_number = -4; - emit_expr (&expr, 4); - - /* Version. */ - out_two (2); - - /* Length of the prologue following this length. */ - expr.X_op = O_subtract; - expr.X_add_symbol = prologue_end; - expr.X_op_symbol = line_start; - expr.X_add_number = - (4 + 2 + 4); - emit_expr (&expr, 4); - - /* Parameters of the state machine. */ - out_byte (DWARF2_LINE_MIN_INSN_LENGTH); - out_byte (DWARF2_LINE_DEFAULT_IS_STMT); - out_byte (DWARF2_LINE_BASE); - out_byte (DWARF2_LINE_RANGE); - out_byte (DWARF2_LINE_OPCODE_BASE); - - /* Standard opcode lengths. */ - out_byte (0); /* DW_LNS_copy */ - out_byte (1); /* DW_LNS_advance_pc */ - out_byte (1); /* DW_LNS_advance_line */ - out_byte (1); /* DW_LNS_set_file */ - out_byte (1); /* DW_LNS_set_column */ - out_byte (0); /* DW_LNS_negate_stmt */ - out_byte (0); /* DW_LNS_set_basic_block */ - out_byte (0); /* DW_LNS_const_add_pc */ - out_byte (1); /* DW_LNS_fixed_advance_pc */ - - out_file_list (); - - set_symbol_value_now (prologue_end); - - /* For each section, emit a statement program. */ - for (s = all_segs; s; s = s->next) - process_entries (s->seg, s->head->head); - - set_symbol_value_now (line_end); -} - -/* Emit data for .debug_aranges. */ - -static void -out_debug_aranges (aranges_seg, info_seg) - segT aranges_seg; - segT info_seg; -{ - unsigned int addr_size = sizeof_address; - addressT size, skip; - struct line_seg *s; - expressionS expr; - char *p; - - size = 4 + 2 + 4 + 1 + 1; - - skip = 2 * addr_size - (size & (2 * addr_size - 1)); - if (skip == 2 * addr_size) - skip = 0; - size += skip; - - for (s = all_segs; s; s = s->next) - size += 2 * addr_size; - - size += 2 * addr_size; - - subseg_set (aranges_seg, 0); - - /* Length of the compilation unit. */ - out_four (size - 4); - - /* Version. */ - out_two (2); - - /* Offset to .debug_info. */ - expr.X_op = O_symbol; - expr.X_add_symbol = section_symbol (info_seg); - expr.X_add_number = 0; - emit_expr (&expr, 4); - - /* Size of an address (offset portion). */ - out_byte (addr_size); - - /* Size of a segment descriptor. */ - out_byte (0); - - /* Align the header. */ - if (skip) - frag_align (ffs (2 * addr_size) - 1, 0, 0); - - for (s = all_segs; s; s = s->next) - { - fragS *frag; - symbolS *beg, *end; - - frag = first_frag_for_seg (s->seg); - beg = symbol_new (fake_label_name, s->seg, 0, frag); - s->text_start = beg; - - frag = last_frag_for_seg (s->seg); - end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag); - s->text_end = end; - - expr.X_op = O_symbol; - expr.X_add_symbol = beg; - expr.X_add_number = 0; - emit_expr (&expr, addr_size); - - expr.X_op = O_subtract; - expr.X_add_symbol = end; - expr.X_op_symbol = beg; - expr.X_add_number = 0; - emit_expr (&expr, addr_size); - } - - p = frag_more (2 * addr_size); - md_number_to_chars (p, 0, addr_size); - md_number_to_chars (p + addr_size, 0, addr_size); -} - -/* Emit data for .debug_abbrev. Note that this must be kept in - sync with out_debug_info below. */ - -static void -out_debug_abbrev (abbrev_seg) - segT abbrev_seg; -{ - subseg_set (abbrev_seg, 0); - - out_uleb128 (1); - out_uleb128 (DW_TAG_compile_unit); - out_byte (DW_CHILDREN_no); - out_abbrev (DW_AT_stmt_list, DW_FORM_data4); - if (all_segs->next == NULL) - { - out_abbrev (DW_AT_low_pc, DW_FORM_addr); - out_abbrev (DW_AT_high_pc, DW_FORM_addr); - } - out_abbrev (DW_AT_comp_dir, DW_FORM_string); - out_abbrev (DW_AT_producer, DW_FORM_string); - out_abbrev (DW_AT_language, DW_FORM_data2); - out_abbrev (0, 0); - - /* Terminate the abbreviations for this compilation unit. */ - out_byte (0); -} - -/* Emit a description of this compilation unit for .debug_info. */ - -static void -out_debug_info (info_seg, abbrev_seg, line_seg) - segT info_seg; - segT abbrev_seg; - segT line_seg; -{ - char producer[128]; - char *comp_dir; - expressionS expr; - symbolS *info_start; - symbolS *info_end; - char *p; - int len; - - subseg_set (info_seg, 0); - - info_start = symbol_new_now (); - info_end = symbol_make (fake_label_name); - - /* Compilation Unit length. */ - expr.X_op = O_subtract; - expr.X_add_symbol = info_end; - expr.X_op_symbol = info_start; - expr.X_add_number = -4; - emit_expr (&expr, 4); - - /* DWARF version. */ - out_two (2); - - /* .debug_abbrev offset */ - expr.X_op = O_symbol; - expr.X_add_symbol = section_symbol (abbrev_seg); - expr.X_add_number = 0; - emit_expr (&expr, 4); - - /* Target address size. */ - out_byte (sizeof_address); - - /* DW_TAG_compile_unit DIE abbrev */ - out_uleb128 (1); - - /* DW_AT_stmt_list */ - expr.X_op = O_symbol; - expr.X_add_symbol = section_symbol (line_seg); - expr.X_add_number = 0; - emit_expr (&expr, 4); - - /* These two attributes may only be emitted if all of the code is - contiguous. Multiple sections are not that. */ - if (all_segs->next == NULL) - { - /* DW_AT_low_pc */ - expr.X_op = O_symbol; - expr.X_add_symbol = all_segs->text_start; - expr.X_add_number = 0; - emit_expr (&expr, sizeof_address); - - /* DW_AT_high_pc */ - expr.X_op = O_symbol; - expr.X_add_symbol = all_segs->text_end; - expr.X_add_number = 0; - emit_expr (&expr, sizeof_address); - } - - /* DW_AT_comp_dir */ - comp_dir = getpwd (); - len = strlen (comp_dir) + 1; - p = frag_more (len); - memcpy (p, comp_dir, len); - - /* DW_AT_producer */ - sprintf (producer, "GNU AS %s", VERSION); - len = strlen (producer) + 1; - p = frag_more (len); - memcpy (p, producer, len); - - /* DW_AT_language. Yes, this is probably not really MIPS, but the - dwarf2 draft has no standard code for assembler. */ - out_two (DW_LANG_Mips_Assembler); - - set_symbol_value_now (info_end); -} - -void -dwarf2_finish () -{ - segT line_seg; - struct line_seg *s; - - /* If no debug information was recorded, nothing to do. */ - if (all_segs == NULL && files_in_use <= 1) - return; - - /* Calculate the size of an address for the target machine. */ - sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8; - - /* Create and switch to the line number section. */ - line_seg = subseg_new (".debug_line", 0); - bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY); - - /* For each subsection, chain the debug entries together. */ - for (s = all_segs; s; s = s->next) - { - struct line_subseg *ss = s->head; - struct line_entry **ptail = ss->ptail; - - while ((ss = ss->next) != NULL) - { - *ptail = ss->head; - ptail = ss->ptail; - } - } - - out_debug_line (line_seg); - - /* If this is assembler generated line info, we need .debug_info - and .debug_abbrev sections as well. */ - if (all_segs != NULL && debug_type == DEBUG_DWARF2) - { - segT abbrev_seg; - segT info_seg; - segT aranges_seg; - - info_seg = subseg_new (".debug_info", 0); - abbrev_seg = subseg_new (".debug_abbrev", 0); - aranges_seg = subseg_new (".debug_aranges", 0); - - bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY); - bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY); - bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY); - - record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); - - out_debug_aranges (aranges_seg, info_seg); - out_debug_abbrev (abbrev_seg); - out_debug_info (info_seg, abbrev_seg, line_seg); - } -} - -#else -void -dwarf2_finish () -{ -} - -int -dwarf2dbg_estimate_size_before_relax (frag) - fragS *frag ATTRIBUTE_UNUSED; -{ - as_fatal (_("dwarf2 is not supported for this object file format")); - return 0; -} - -int -dwarf2dbg_relax_frag (frag) - fragS *frag ATTRIBUTE_UNUSED; -{ - as_fatal (_("dwarf2 is not supported for this object file format")); - return 0; -} - -void -dwarf2dbg_convert_frag (frag) - fragS *frag ATTRIBUTE_UNUSED; -{ - as_fatal (_("dwarf2 is not supported for this object file format")); -} - -void -dwarf2_emit_insn (size) - int size ATTRIBUTE_UNUSED; -{ -} - -void -dwarf2_directive_file (dummy) - int dummy ATTRIBUTE_UNUSED; -{ - s_app_file (0); -} - -void -dwarf2_directive_loc (dummy) - int dummy ATTRIBUTE_UNUSED; -{ - as_fatal (_("dwarf2 is not supported for this object file format")); -} -#endif /* BFD_ASSEMBLER */ |