/* dwarf2dbg.c - DWARF2 debug support
- Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1999-2016 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)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
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. */
+ Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
/* Logical line numbers can be controlled by the compiler via the
- following two directives:
+ following directives:
.file FILENO "file.c"
- .loc FILENO LINENO [COLUMN]
+ .loc FILENO LINENO [COLUMN] [basic_block] [prologue_end] \
+ [epilogue_begin] [is_stmt VALUE] [isa VALUE] \
+ [discriminator VALUE]
+*/
- FILENO is the filenumber. */
-
-#include "ansidecl.h"
#include "as.h"
+#include "safe-ctype.h"
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#endif
-#ifdef BFD_ASSEMBLER
-
#include "dwarf2dbg.h"
+#include <filenames.h>
+
+#ifdef HAVE_DOS_BASED_FILE_SYSTEM
+/* We need to decide which character to use as a directory separator.
+ Just because HAVE_DOS_BASED_FILE_SYSTEM is defined, it does not
+ necessarily mean that the backslash character is the one to use.
+ Some environments, eg Cygwin, can support both naming conventions.
+ So we use the heuristic that we only need to use the backslash if
+ the path is an absolute path starting with a DOS style drive
+ selector. eg C: or D: */
+# define INSERT_DIR_SEPARATOR(string, offset) \
+ do \
+ { \
+ if (offset > 1 \
+ && string[0] != 0 \
+ && string[1] == ':') \
+ string [offset] = '\\'; \
+ else \
+ string [offset] = '/'; \
+ } \
+ while (0)
+#else
+# define INSERT_DIR_SEPARATOR(string, offset) string[offset] = '/'
+#endif
+
+#ifndef DWARF2_FORMAT
+# define DWARF2_FORMAT(SEC) dwarf2_format_32bit
+#endif
+
+#ifndef DWARF2_ADDR_SIZE
+# define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8)
+#endif
+
+#ifndef DWARF2_FILE_NAME
+#define DWARF2_FILE_NAME(FILENAME, DIRNAME) FILENAME
+#endif
+
+#ifndef DWARF2_FILE_TIME_NAME
+#define DWARF2_FILE_TIME_NAME(FILENAME,DIRNAME) 0
+#endif
+
+#ifndef DWARF2_FILE_SIZE_NAME
+#define DWARF2_FILE_SIZE_NAME(FILENAME,DIRNAME) 0
+#endif
+
+#ifndef DWARF2_VERSION
+#define DWARF2_VERSION 2
+#endif
+
+/* The .debug_aranges version has been 2 in DWARF version 2, 3 and 4. */
+#ifndef DWARF2_ARANGES_VERSION
+#define DWARF2_ARANGES_VERSION 2
+#endif
+
+/* This implementation output version 2 .debug_line information. */
+#ifndef DWARF2_LINE_VERSION
+#define DWARF2_LINE_VERSION 2
+#endif
+
#include "subsegs.h"
-#include "elf/dwarf2.h"
+#include "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
#define DL_FILES 1
#define DL_BODY 2
+/* If linker relaxation might change offsets in the code, the DWARF special
+ opcodes and variable-length operands cannot be used. If this macro is
+ nonzero, use the DW_LNS_fixed_advance_pc opcode instead. */
+#ifndef DWARF2_USE_FIXED_ADVANCE_PC
+# define DWARF2_USE_FIXED_ADVANCE_PC linkrelax
+#endif
+
/* 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
+ out_debug_line(). */
+#define DWARF2_LINE_OPCODE_BASE 13
#ifndef DWARF2_LINE_BASE
/* Minimum line offset in a special line info. opcode. This value
# 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. */
+/* Flag that indicates the initial value of the is_stmt_start flag. */
#define DWARF2_LINE_DEFAULT_IS_STMT 1
/* Given a special op, return the line skip amount. */
/* The maximum address skip amount that can be encoded with a special op. */
#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255)
+#ifndef TC_PARSE_CONS_RETURN_NONE
+#define TC_PARSE_CONS_RETURN_NONE BFD_RELOC_NONE
+#endif
+
struct line_entry {
struct line_entry *next;
- fragS *frag;
- addressT frag_ofs;
+ symbolS *label;
struct dwarf2_line_info loc;
};
subsegT subseg;
struct line_entry *head;
struct line_entry **ptail;
+ struct line_entry **pmove_tail;
};
struct line_seg {
/* Collects data for all line table entries during assembly. */
static struct line_seg *all_segs;
+static struct line_seg **last_seg_ptr;
struct file_entry {
- char *filename;
+ const char *filename;
unsigned int dir;
};
static unsigned int files_in_use;
static unsigned int files_allocated;
-/* True when we've seen a .loc directive recently. Used to avoid
+/* Table of directories used by .debug_line. */
+static char **dirs;
+static unsigned int dirs_in_use;
+static unsigned int dirs_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;
+bfd_boolean dwarf2_loc_directive_seen;
-/* Current location as indicated by the most recent .loc directive. */
-static struct dwarf2_line_info current;
+/* TRUE when we're supposed to set the basic block mark whenever a
+ label is seen. */
+bfd_boolean dwarf2_loc_mark_labels;
-/* Fake label name. */
-static char const fake_label_name[] = ".L0\001";
+/* Current location as indicated by the most recent .loc directive. */
+static struct dwarf2_line_info current = {
+ 1, 1, 0, 0,
+ DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0,
+ 0
+};
/* The size of an address on the target. */
static unsigned int sizeof_address;
\f
-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));
-\f
-/* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */
+static unsigned int get_filenum (const char *, unsigned int);
-static struct line_subseg *
-get_line_subseg (seg, subseg)
- segT seg;
- subsegT subseg;
+#ifndef TC_DWARF2_EMIT_OFFSET
+#define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset
+
+/* Create an offset to .dwarf2_*. */
+
+static void
+generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size)
{
- static segT last_seg;
- static subsegT last_subseg;
- static struct line_subseg *last_line_subseg;
+ expressionS exp;
- struct line_seg *s;
- struct line_subseg **pss, *ss;
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = symbol;
+ exp.X_add_number = 0;
+ emit_expr (&exp, size);
+}
+#endif
- if (seg == last_seg && subseg == last_subseg)
- return last_line_subseg;
+/* Find or create (if CREATE_P) an entry for SEG+SUBSEG in ALL_SEGS. */
- for (s = all_segs; s; s = s->next)
- if (s->seg == seg)
- goto found_seg;
+static struct line_subseg *
+get_line_subseg (segT seg, subsegT subseg, bfd_boolean create_p)
+{
+ struct line_seg *s = seg_info (seg)->dwarf2_line_seg;
+ struct line_subseg **pss, *lss;
- s = (struct line_seg *) xmalloc (sizeof (*s));
- s->next = all_segs;
- s->seg = seg;
- s->head = NULL;
- all_segs = s;
+ if (s == NULL)
+ {
+ if (!create_p)
+ return NULL;
+
+ s = XNEW (struct line_seg);
+ s->next = NULL;
+ s->seg = seg;
+ s->head = NULL;
+ *last_seg_ptr = s;
+ last_seg_ptr = &s->next;
+ seg_info (seg)->dwarf2_line_seg = s;
+ }
+ gas_assert (seg == s->seg);
- found_seg:
- for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next)
+ for (pss = &s->head; (lss = *pss) != NULL ; pss = &lss->next)
{
- if (ss->subseg == subseg)
+ if (lss->subseg == subseg)
goto found_subseg;
- if (ss->subseg > subseg)
+ if (lss->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;
+ lss = XNEW (struct line_subseg);
+ lss->next = *pss;
+ lss->subseg = subseg;
+ lss->head = NULL;
+ lss->ptail = &lss->head;
+ lss->pmove_tail = &lss->head;
+ *pss = lss;
found_subseg:
- last_seg = seg;
- last_subseg = subseg;
- last_line_subseg = ss;
+ return lss;
+}
- return ss;
+/* Record an entry for LOC occurring at LABEL. */
+
+static void
+dwarf2_gen_line_info_1 (symbolS *label, struct dwarf2_line_info *loc)
+{
+ struct line_subseg *lss;
+ struct line_entry *e;
+
+ e = XNEW (struct line_entry);
+ e->next = NULL;
+ e->label = label;
+ e->loc = *loc;
+
+ lss = get_line_subseg (now_seg, now_subseg, TRUE);
+ *lss->ptail = e;
+ lss->ptail = &e->next;
}
-/* Record an entry for LOC ocurring at OFS within the current fragment. */
+/* Record an entry for LOC occurring at OFS within the current fragment. */
void
-dwarf2_gen_line_info (ofs, loc)
- addressT ofs;
- struct dwarf2_line_info *loc;
+dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc)
{
- struct line_subseg *ss;
- struct line_entry *e;
static unsigned int line = -1;
static unsigned int filenum = -1;
+ symbolS *sym;
+
/* Early out for as-yet incomplete location information. */
if (loc->filenum == 0 || loc->line == 0)
return;
line = loc->line;
filenum = loc->filenum;
- e = (struct line_entry *) xmalloc (sizeof (*e));
- e->next = NULL;
- e->frag = frag_now;
- e->frag_ofs = ofs;
- e->loc = *loc;
+ if (linkrelax)
+ {
+ char name[120];
- ss = get_line_subseg (now_seg, now_subseg);
- *ss->ptail = e;
- ss->ptail = &e->next;
+ /* Use a non-fake name for the line number location,
+ so that it can be referred to by relocations. */
+ sprintf (name, ".Loc.%u.%u", line, filenum);
+ sym = symbol_new (name, now_seg, ofs, frag_now);
+ }
+ else
+ sym = symbol_temp_new (now_seg, ofs, frag_now);
+ dwarf2_gen_line_info_1 (sym, loc);
}
+/* Returns the current source information. If .file directives have
+ been encountered, the info for the corresponding source file is
+ returned. Otherwise, the info for the assembly source file is
+ returned. */
+
void
-dwarf2_where (line)
- struct dwarf2_line_info *line;
+dwarf2_where (struct dwarf2_line_info *line)
{
if (debug_type == DEBUG_DWARF2)
{
- char *filename;
- as_where (&filename, &line->line);
- line->filenum = get_filenum (filename);
+ const char *filename = as_where (&line->line);
+ line->filenum = get_filenum (filename, 0);
line->column = 0;
- line->flags = DWARF2_FLAG_BEGIN_STMT;
+ line->flags = DWARF2_FLAG_IS_STMT;
+ line->isa = current.isa;
+ line->discriminator = current.discriminator;
}
else
*line = current;
}
+/* A hook to allow the target backend to inform the line number state
+ machine of isa changes when assembler debug info is enabled. */
+
+void
+dwarf2_set_isa (unsigned int isa)
+{
+ current.isa = isa;
+}
+
/* 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;
+dwarf2_emit_insn (int size)
{
struct dwarf2_line_info loc;
- if (loc_directive_seen)
+ if (!dwarf2_loc_directive_seen && debug_type != DEBUG_DWARF2)
+ return;
+
+ dwarf2_where (&loc);
+
+ dwarf2_gen_line_info (frag_now_fix () - size, &loc);
+ dwarf2_consume_line_info ();
+}
+
+/* Move all previously-emitted line entries for the current position by
+ DELTA bytes. This function cannot be used to move the same entries
+ twice. */
+
+void
+dwarf2_move_insn (int delta)
+{
+ struct line_subseg *lss;
+ struct line_entry *e;
+ valueT now;
+
+ if (delta == 0)
+ return;
+
+ lss = get_line_subseg (now_seg, now_subseg, FALSE);
+ if (!lss)
+ return;
+
+ now = frag_now_fix ();
+ while ((e = *lss->pmove_tail))
{
- /* Use the last location established by a .loc directive, not
- the value returned by dwarf2_where(). That calls as_where()
- which will return either the logical input file name (foo.c)
- or the physical input file name (foo.s) and not the file name
- specified in the most recent .loc directive (eg foo.h). */
- loc = current;
-
- /* Unless we generate DWARF2 debugging information for each
- assembler line, we only emit one line symbol for one LOC. */
- if (debug_type != DEBUG_DWARF2)
- loc_directive_seen = false;
+ if (S_GET_VALUE (e->label) == now)
+ S_SET_VALUE (e->label, now + delta);
+ lss->pmove_tail = &e->next;
}
- else if (debug_type != DEBUG_DWARF2)
+}
+
+/* Called after the current line information has been either used with
+ dwarf2_gen_line_info or saved with a machine instruction for later use.
+ This resets the state of the line number information to reflect that
+ it has been used. */
+
+void
+dwarf2_consume_line_info (void)
+{
+ /* Unless we generate DWARF2 debugging information for each
+ assembler line, we only emit one line symbol for one LOC. */
+ dwarf2_loc_directive_seen = FALSE;
+
+ current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK
+ | DWARF2_FLAG_PROLOGUE_END
+ | DWARF2_FLAG_EPILOGUE_BEGIN);
+ current.discriminator = 0;
+}
+
+/* Called for each (preferably code) label. If dwarf2_loc_mark_labels
+ is enabled, emit a basic block marker. */
+
+void
+dwarf2_emit_label (symbolS *label)
+{
+ struct dwarf2_line_info loc;
+
+ if (!dwarf2_loc_mark_labels)
+ return;
+ if (S_GET_SEGMENT (label) != now_seg)
+ return;
+ if (!(bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE))
+ return;
+ if (files_in_use == 0 && debug_type != DEBUG_DWARF2)
return;
- else
- dwarf2_where (& loc);
- dwarf2_gen_line_info (frag_now_fix () - size, &loc);
+ dwarf2_where (&loc);
+
+ loc.flags |= DWARF2_FLAG_BASIC_BLOCK;
+
+ dwarf2_gen_line_info_1 (label, &loc);
+ dwarf2_consume_line_info ();
}
-/* Get a .debug_line file number for FILENAME. */
+/* Get a .debug_line file number for FILENAME. If NUM is nonzero,
+ allocate it on that file table slot, otherwise return the first
+ empty one. */
static unsigned int
-get_filenum (filename)
- const char *filename;
+get_filenum (const char *filename, unsigned int num)
{
- static unsigned int last_used;
- unsigned int i;
+ static unsigned int last_used, last_used_dir_len;
+ const char *file;
+ size_t dir_len;
+ unsigned int i, dir;
- if (last_used)
- if (strcmp (filename, files[last_used].filename) == 0)
- return last_used;
+ if (num == 0 && last_used)
+ {
+ if (! files[last_used].dir
+ && filename_cmp (filename, files[last_used].filename) == 0)
+ return last_used;
+ if (files[last_used].dir
+ && filename_ncmp (filename, dirs[files[last_used].dir],
+ last_used_dir_len) == 0
+ && IS_DIR_SEPARATOR (filename [last_used_dir_len])
+ && filename_cmp (filename + last_used_dir_len + 1,
+ 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;
+ file = lbasename (filename);
+ /* Don't make empty string from / or A: from A:/ . */
+#ifdef HAVE_DOS_BASED_FILE_SYSTEM
+ if (file <= filename + 3)
+ file = filename;
+#else
+ if (file == filename + 1)
+ file = filename;
+#endif
+ dir_len = file - filename;
+
+ dir = 0;
+ if (dir_len)
+ {
+#ifndef DWARF2_DIR_SHOULD_END_WITH_SEPARATOR
+ --dir_len;
+#endif
+ for (dir = 1; dir < dirs_in_use; ++dir)
+ if (filename_ncmp (filename, dirs[dir], dir_len) == 0
+ && dirs[dir][dir_len] == '\0')
+ break;
+
+ if (dir >= dirs_in_use)
+ {
+ if (dir >= dirs_allocated)
+ {
+ dirs_allocated = dir + 32;
+ dirs = XRESIZEVEC (char *, dirs, dirs_allocated);
+ }
+
+ dirs[dir] = (char *) xmalloc (dir_len + 1);
+ memcpy (dirs[dir], filename, dir_len);
+ dirs[dir][dir_len] = '\0';
+ dirs_in_use = dir + 1;
+ }
+ }
+
+ if (num == 0)
+ {
+ for (i = 1; i < files_in_use; ++i)
+ if (files[i].dir == dir
+ && files[i].filename
+ && filename_cmp (file, files[i].filename) == 0)
+ {
+ last_used = i;
+ last_used_dir_len = dir_len;
+ return i;
+ }
+ }
+ else
+ i = num;
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));
+ files = XRESIZEVEC (struct file_entry, files, files_allocated);
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;
+ files[i].filename = num ? file : xstrdup (file);
+ files[i].dir = dir;
+ if (files_in_use < i + 1)
+ files_in_use = i + 1;
last_used = i;
+ last_used_dir_len = dir_len;
return i;
}
-/* Handle the .file directive. */
+/* Handle two forms of .file directive:
+ - Pass .file "source.c" to s_app_file
+ - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table
-void
-dwarf2_directive_file (dummy)
- int dummy ATTRIBUTE_UNUSED;
+ If an entry is added to the file table, return a pointer to the filename. */
+
+char *
+dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED)
{
offsetT num;
char *filename;
if (*input_line_pointer == '"')
{
s_app_file (0);
- return;
+ return NULL;
}
num = get_absolute_expression ();
filename = demand_copy_C_string (&filename_len);
+ if (filename == NULL)
+ return NULL;
demand_empty_rest_of_line ();
if (num < 1)
{
as_bad (_("file number less than one"));
- return;
+ return NULL;
}
+ /* A .file directive implies compiler generated debug information is
+ being supplied. Turn off gas generated debug info. */
+ debug_type = DEBUG_NONE;
+
if (num < (int) files_in_use && files[num].filename != 0)
{
as_bad (_("file number %ld already allocated"), (long) num);
- return;
+ return NULL;
}
- 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));
- }
+ get_filenum (filename, num);
- files[num].filename = filename;
- files[num].dir = 0;
- files_in_use = num + 1;
+ return filename;
}
void
-dwarf2_directive_loc (dummy)
- int dummy ATTRIBUTE_UNUSED;
+dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED)
{
- offsetT filenum, line, column;
+ offsetT filenum, line;
+
+ /* If we see two .loc directives in a row, force the first one to be
+ output now. */
+ if (dwarf2_loc_directive_seen)
+ dwarf2_emit_insn (0);
filenum = get_absolute_expression ();
SKIP_WHITESPACE ();
line = get_absolute_expression ();
- SKIP_WHITESPACE ();
- column = get_absolute_expression ();
- demand_empty_rest_of_line ();
if (filenum < 1)
{
current.filenum = filenum;
current.line = line;
- current.column = column;
- current.flags = DWARF2_FLAG_BEGIN_STMT;
-
- loc_directive_seen = true;
+ current.discriminator = 0;
#ifndef NO_LISTING
if (listing)
- listing_source_line (line);
+ {
+ if (files[filenum].dir)
+ {
+ size_t dir_len = strlen (dirs[files[filenum].dir]);
+ size_t file_len = strlen (files[filenum].filename);
+ char *cp = (char *) xmalloc (dir_len + 1 + file_len + 1);
+
+ memcpy (cp, dirs[files[filenum].dir], dir_len);
+ INSERT_DIR_SEPARATOR (cp, dir_len);
+ memcpy (cp + dir_len + 1, files[filenum].filename, file_len);
+ cp[dir_len + file_len + 1] = '\0';
+ listing_source_file (cp);
+ free (cp);
+ }
+ else
+ listing_source_file (files[filenum].filename);
+ listing_source_line (line);
+ }
#endif
+
+ SKIP_WHITESPACE ();
+ if (ISDIGIT (*input_line_pointer))
+ {
+ current.column = get_absolute_expression ();
+ SKIP_WHITESPACE ();
+ }
+
+ while (ISALPHA (*input_line_pointer))
+ {
+ char *p, c;
+ offsetT value;
+
+ c = get_symbol_name (& p);
+
+ if (strcmp (p, "basic_block") == 0)
+ {
+ current.flags |= DWARF2_FLAG_BASIC_BLOCK;
+ *input_line_pointer = c;
+ }
+ else if (strcmp (p, "prologue_end") == 0)
+ {
+ current.flags |= DWARF2_FLAG_PROLOGUE_END;
+ *input_line_pointer = c;
+ }
+ else if (strcmp (p, "epilogue_begin") == 0)
+ {
+ current.flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
+ *input_line_pointer = c;
+ }
+ else if (strcmp (p, "is_stmt") == 0)
+ {
+ (void) restore_line_pointer (c);
+ value = get_absolute_expression ();
+ if (value == 0)
+ current.flags &= ~DWARF2_FLAG_IS_STMT;
+ else if (value == 1)
+ current.flags |= DWARF2_FLAG_IS_STMT;
+ else
+ {
+ as_bad (_("is_stmt value not 0 or 1"));
+ return;
+ }
+ }
+ else if (strcmp (p, "isa") == 0)
+ {
+ (void) restore_line_pointer (c);
+ value = get_absolute_expression ();
+ if (value >= 0)
+ current.isa = value;
+ else
+ {
+ as_bad (_("isa number less than zero"));
+ return;
+ }
+ }
+ else if (strcmp (p, "discriminator") == 0)
+ {
+ (void) restore_line_pointer (c);
+ value = get_absolute_expression ();
+ if (value >= 0)
+ current.discriminator = value;
+ else
+ {
+ as_bad (_("discriminator less than zero"));
+ return;
+ }
+ }
+ else
+ {
+ as_bad (_("unknown .loc sub-directive `%s'"), p);
+ (void) restore_line_pointer (c);
+ return;
+ }
+
+ SKIP_WHITESPACE_AFTER_NAME ();
+ }
+
+ demand_empty_rest_of_line ();
+ dwarf2_loc_directive_seen = TRUE;
+ debug_type = DEBUG_NONE;
+}
+
+void
+dwarf2_directive_loc_mark_labels (int dummy ATTRIBUTE_UNUSED)
+{
+ offsetT value = get_absolute_expression ();
+
+ if (value != 0 && value != 1)
+ {
+ as_bad (_("expected 0 or 1"));
+ ignore_rest_of_line ();
+ }
+ else
+ {
+ dwarf2_loc_mark_labels = value != 0;
+ demand_empty_rest_of_line ();
+ }
}
\f
static struct frag *
-first_frag_for_seg (seg)
- segT seg;
+first_frag_for_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;
+ return seg_info (seg)->frchainP->frch_root;
}
static struct frag *
-last_frag_for_seg (seg)
- segT seg;
+last_frag_for_seg (segT seg)
{
- frchainS *f, *last = NULL;
+ frchainS *f = seg_info (seg)->frchainP;
- for (f = frchain_root; f; f = f->frch_next)
- if (f->frch_seg == seg
- && (! last || last->frch_subseg < f->frch_subseg))
- last= f;
+ while (f->frch_next != NULL)
+ f = f->frch_next;
- return last ? last->frch_last : NULL;
+ return f->frch_last;
}
\f
/* Emit a single byte into the current segment. */
static inline void
-out_byte (byte)
- int byte;
+out_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_opcode (int opc)
{
out_byte (opc);
}
/* Emit a two-byte word into the current segment. */
static inline void
-out_two (data)
- int data;
+out_two (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;
+out_four (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;
+out_uleb128 (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. */
+/* Emit a signed "little-endian base 128" number. */
-static symbolS *
-symbol_new_now ()
+static void
+out_leb128 (addressT value)
{
- return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now);
+ output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1);
}
-/* Set the value of SYM to the current position in the current segment. */
+/* Emit a tuple for .debug_abbrev. */
-static void
-set_symbol_value_now (sym)
- symbolS *sym;
+static inline void
+out_abbrev (int name, int form)
{
- S_SET_SEGMENT (sym, now_seg);
- S_SET_VALUE (sym, frag_now_fix ());
- symbol_set_frag (sym, frag_now);
+ out_uleb128 (name);
+ out_uleb128 (form);
}
/* Get the size of a fragment. */
static offsetT
-get_frag_fix (frag)
- fragS *frag;
+get_frag_fix (fragS *frag, segT seg)
{
frchainS *fr;
/* 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)
+ for (fr = seg_info (seg)->frchainP; fr; fr = fr->frch_next)
if (fr->frch_last == frag)
- {
- long align_mask = -1 << get_recorded_alignment (fr->frch_seg);
- return (((char *) obstack_next_free (&fr->frch_obstack)
- - frag->fr_literal) + ~align_mask) & align_mask;
- }
+ 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;
+out_set_addr (symbolS *sym)
{
- expressionS expr;
- symbolS *sym;
-
- sym = symbol_new (fake_label_name, seg, ofs, frag);
+ expressionS exp;
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);
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = sym;
+ exp.X_add_number = 0;
+ emit_expr (&exp, sizeof_address);
+}
+
+static void scale_addr_delta (addressT *);
+
+static void
+scale_addr_delta (addressT *addr_delta)
+{
+ static int printed_this = 0;
+ if (DWARF2_LINE_MIN_INSN_LENGTH > 1)
+ {
+ if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0 && !printed_this)
+ {
+ as_bad("unaligned opcodes detected in executable segment");
+ printed_this = 1;
+ }
+ *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH;
+ }
}
/* Encode a pair of line and address skips as efficiently as possible.
exactly the expected number of bytes. */
static int
-size_inc_line_addr (line_delta, addr_delta)
- int line_delta;
- addressT addr_delta;
+size_inc_line_addr (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
+ scale_addr_delta (&addr_delta);
/* 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
}
static void
-emit_inc_line_addr (line_delta, addr_delta, p, len)
- int line_delta;
- addressT addr_delta;
- char *p;
- int len;
+emit_inc_line_addr (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
+ /* Line number sequences cannot go backward in addresses. This means
+ we've incorrectly ordered the statements in the sequence. */
+ gas_assert ((offsetT) addr_delta >= 0);
+
/* 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
+ scale_addr_delta (&addr_delta);
+
/* 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. */
*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;
}
+ /* Prettier, I think, to use DW_LNS_copy instead of a "line +0, addr +0"
+ special opcode. */
+ if (line_delta == 0 && addr_delta == 0)
+ {
+ *p++ = DW_LNS_copy;
+ goto done;
+ }
+
/* Bias the opcode by the special opcode base. */
tmp += DWARF2_LINE_OPCODE_BASE;
*p++ = tmp;
done:
- assert (p == end);
+ gas_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;
+out_inc_line_addr (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);
}
+/* Write out an alternative form of line and address skips using
+ DW_LNS_fixed_advance_pc opcodes. This uses more space than the default
+ line and address information, but it is required if linker relaxation
+ could change the code offsets. The following two routines *must* be
+ kept in sync. */
+#define ADDR_DELTA_LIMIT 50000
+
+static int
+size_fixed_inc_line_addr (int line_delta, addressT addr_delta)
+{
+ int len = 0;
+
+ /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */
+ if (line_delta != INT_MAX)
+ len = 1 + sizeof_leb128 (line_delta, 1);
+
+ if (addr_delta > ADDR_DELTA_LIMIT)
+ {
+ /* DW_LNS_extended_op */
+ len += 1 + sizeof_leb128 (sizeof_address + 1, 0);
+ /* DW_LNE_set_address */
+ len += 1 + sizeof_address;
+ }
+ else
+ /* DW_LNS_fixed_advance_pc */
+ len += 3;
+
+ if (line_delta == INT_MAX)
+ /* DW_LNS_extended_op + DW_LNE_end_sequence */
+ len += 3;
+ else
+ /* DW_LNS_copy */
+ len += 1;
+
+ return len;
+}
+
+static void
+emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag,
+ char *p, int len)
+{
+ expressionS *pexp;
+ char *end = p + len;
+
+ /* Line number sequences cannot go backward in addresses. This means
+ we've incorrectly ordered the statements in the sequence. */
+ gas_assert ((offsetT) addr_delta >= 0);
+
+ /* Verify that we have kept in sync with size_fixed_inc_line_addr. */
+ gas_assert (len == size_fixed_inc_line_addr (line_delta, addr_delta));
+
+ /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. */
+ if (line_delta != INT_MAX)
+ {
+ *p++ = DW_LNS_advance_line;
+ p += output_leb128 (p, line_delta, 1);
+ }
+
+ pexp = symbol_get_value_expression (frag->fr_symbol);
+
+ /* The DW_LNS_fixed_advance_pc opcode has a 2-byte operand so it can
+ advance the address by at most 64K. Linker relaxation (without
+ which this function would not be used) could change the operand by
+ an unknown amount. If the address increment is getting close to
+ the limit, just reset the address. */
+ if (addr_delta > ADDR_DELTA_LIMIT)
+ {
+ symbolS *to_sym;
+ expressionS exp;
+
+ gas_assert (pexp->X_op == O_subtract);
+ to_sym = pexp->X_add_symbol;
+
+ *p++ = DW_LNS_extended_op;
+ p += output_leb128 (p, sizeof_address + 1, 0);
+ *p++ = DW_LNE_set_address;
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = to_sym;
+ exp.X_add_number = 0;
+ emit_expr_fix (&exp, sizeof_address, frag, p, TC_PARSE_CONS_RETURN_NONE);
+ p += sizeof_address;
+ }
+ else
+ {
+ *p++ = DW_LNS_fixed_advance_pc;
+ emit_expr_fix (pexp, 2, frag, p, TC_PARSE_CONS_RETURN_NONE);
+ p += 2;
+ }
+
+ if (line_delta == INT_MAX)
+ {
+ *p++ = DW_LNS_extended_op;
+ *p++ = 1;
+ *p++ = DW_LNE_end_sequence;
+ }
+ else
+ *p++ = DW_LNS_copy;
+
+ gas_assert (p == end);
+}
+
/* 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;
+relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym)
{
- symbolS *to_sym, *from_sym;
- expressionS expr;
+ expressionS exp;
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;
+ exp.X_op = O_subtract;
+ exp.X_add_symbol = to_sym;
+ exp.X_op_symbol = from_sym;
+ exp.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);
+ if (DWARF2_USE_FIXED_ADVANCE_PC)
+ max_chars = size_fixed_inc_line_addr (line_delta,
+ -DWARF2_LINE_MIN_INSN_LENGTH);
+ else
+ 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);
+ make_expr_symbol (&exp), line_delta, NULL);
}
/* The function estimates the size of a rs_dwarf2dbg variant frag
the relaxation loop. We set fr_subtype to the expected length. */
int
-dwarf2dbg_estimate_size_before_relax (frag)
- fragS *frag;
+dwarf2dbg_estimate_size_before_relax (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);
+ if (DWARF2_USE_FIXED_ADVANCE_PC)
+ size = size_fixed_inc_line_addr (frag->fr_offset, addr_delta);
+ else
+ size = size_inc_line_addr (frag->fr_offset, addr_delta);
frag->fr_subtype = size;
of the frag. This returns the change in frag length. */
int
-dwarf2dbg_relax_frag (frag)
- fragS *frag;
+dwarf2dbg_relax_frag (fragS *frag)
{
int old_size, new_size;
fr_subtype will be the desired length of the frag. */
void
-dwarf2dbg_convert_frag (frag)
- fragS *frag;
+dwarf2dbg_convert_frag (fragS *frag)
{
offsetT addr_diff;
- addr_diff = resolve_symbol_value (frag->fr_symbol);
+ if (DWARF2_USE_FIXED_ADVANCE_PC)
+ {
+ /* If linker relaxation is enabled then the distance bewteen the two
+ symbols in the frag->fr_symbol expression might change. Hence we
+ cannot rely upon the value computed by resolve_symbol_value.
+ Instead we leave the expression unfinalized and allow
+ emit_fixed_inc_line_addr to create a fixup (which later becomes a
+ relocation) that will allow the linker to correctly compute the
+ actual address difference. We have to use a fixed line advance for
+ this as we cannot (easily) relocate leb128 encoded values. */
+ int saved_finalize_syms = finalize_syms;
+
+ finalize_syms = 0;
+ addr_diff = resolve_symbol_value (frag->fr_symbol);
+ finalize_syms = saved_finalize_syms;
+ }
+ else
+ 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);
+ gas_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);
+ if (DWARF2_USE_FIXED_ADVANCE_PC)
+ emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag,
+ frag->fr_literal + frag->fr_fix,
+ frag->fr_subtype);
+ else
+ 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;
beginning at E, for segment SEG. */
static void
-process_entries (seg, e)
- segT seg;
- struct line_entry *e;
+process_entries (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;
+ unsigned isa = 0;
+ unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
+ fragS *last_frag = NULL, *frag;
+ addressT last_frag_ofs = 0, frag_ofs;
+ symbolS *last_lab = NULL, *lab;
struct line_entry *next;
- while (e)
+ if (flag_dwarf_sections)
{
- int changed = 0;
+ char * name;
+ const char * sec_name;
+
+ /* Switch to the relevent sub-section before we start to emit
+ the line number table.
+
+ FIXME: These sub-sections do not have a normal Line Number
+ Program Header, thus strictly speaking they are not valid
+ DWARF sections. Unfortunately the DWARF standard assumes
+ a one-to-one relationship between compilation units and
+ line number tables. Thus we have to have a .debug_line
+ section, as well as our sub-sections, and we have to ensure
+ that all of the sub-sections are merged into a proper
+ .debug_line section before a debugger sees them. */
+
+ sec_name = bfd_get_section_name (stdoutput, seg);
+ if (strcmp (sec_name, ".text") != 0)
+ {
+ unsigned int len;
+
+ len = strlen (sec_name);
+ name = xmalloc (len + 11 + 2);
+ sprintf (name, ".debug_line%s", sec_name);
+ subseg_set (subseg_get (name, FALSE), 0);
+ }
+ else
+ /* Don't create a .debug_line.text section -
+ that is redundant. Instead just switch back to the
+ normal .debug_line section. */
+ subseg_set (subseg_get (".debug_line", FALSE), 0);
+ }
+
+ do
+ {
+ int line_delta;
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)
+ if (e->loc.discriminator != 0)
{
- flags = e->loc.flags;
- out_opcode (DW_LNS_negate_stmt);
- changed = 1;
+ out_opcode (DW_LNS_extended_op);
+ out_leb128 (1 + sizeof_leb128 (e->loc.discriminator, 0));
+ out_opcode (DW_LNE_set_discriminator);
+ out_uleb128 (e->loc.discriminator);
}
- if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK)
+ if (isa != e->loc.isa)
{
- out_opcode (DW_LNS_set_basic_block);
- changed = 1;
+ isa = e->loc.isa;
+ out_opcode (DW_LNS_set_isa);
+ out_uleb128 (isa);
}
+ if ((e->loc.flags ^ flags) & DWARF2_FLAG_IS_STMT)
+ {
+ flags = e->loc.flags;
+ out_opcode (DW_LNS_negate_stmt);
+ }
+
+ if (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK)
+ out_opcode (DW_LNS_set_basic_block);
+
+ if (e->loc.flags & DWARF2_FLAG_PROLOGUE_END)
+ out_opcode (DW_LNS_set_prologue_end);
+
+ if (e->loc.flags & DWARF2_FLAG_EPILOGUE_BEGIN)
+ out_opcode (DW_LNS_set_epilogue_begin);
+
/* 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);
+ line_delta = e->loc.line - line;
+ lab = e->label;
+ frag = symbol_get_frag (lab);
+ frag_ofs = S_GET_VALUE (lab);
- frag = e->frag;
- frag_ofs = e->frag_ofs;
- line = e->loc.line;
- }
- else if (frag == NULL)
+ if (last_frag == NULL)
{
- out_set_addr (seg, e->frag, e->frag_ofs);
- frag = e->frag;
- frag_ofs = e->frag_ofs;
+ out_set_addr (lab);
+ out_inc_line_addr (line_delta, 0);
}
+ else if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC)
+ out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs);
+ else
+ relax_inc_line_addr (line_delta, lab, last_lab);
+
+ line = e->loc.line;
+ last_lab = lab;
+ last_frag = frag;
+ last_frag_ofs = frag_ofs;
next = e->next;
free (e);
e = next;
}
+ while (e);
/* 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);
+ frag = last_frag_for_seg (seg);
+ frag_ofs = get_frag_fix (frag, seg);
+ if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC)
+ out_inc_line_addr (INT_MAX, frag_ofs - last_frag_ofs);
else
- relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs,
- frag, frag_ofs);
+ {
+ lab = symbol_temp_new (seg, frag_ofs, frag);
+ relax_inc_line_addr (INT_MAX, lab, last_lab);
+ }
}
/* Emit the directory and file tables for .debug_line. */
static void
-out_file_list ()
+out_file_list (void)
{
size_t size;
+ const char *dir;
char *cp;
unsigned int i;
- /* Terminate directory list. */
+ /* Emit directory list. */
+ for (i = 1; i < dirs_in_use; ++i)
+ {
+ dir = remap_debug_filename (dirs[i]);
+ size = strlen (dir) + 1;
+ cp = frag_more (size);
+ memcpy (cp, dir, size);
+ }
+ /* Terminate it. */
out_byte ('\0');
for (i = 1; i < files_in_use; ++i)
{
+ const char *fullfilename;
+
if (files[i].filename == NULL)
{
as_bad (_("unassigned file number %ld"), (long) i);
+ /* Prevent a crash later, particularly for file 1. */
+ files[i].filename = "";
continue;
}
- size = strlen (files[i].filename) + 1;
+ fullfilename = DWARF2_FILE_NAME (files[i].filename,
+ files[i].dir ? dirs [files [i].dir] : "");
+ size = strlen (fullfilename) + 1;
cp = frag_more (size);
- memcpy (cp, files[i].filename, size);
+ memcpy (cp, fullfilename, size);
out_uleb128 (files[i].dir); /* directory number */
- out_uleb128 (0); /* last modification timestamp */
- out_uleb128 (0); /* filesize */
+ /* Output the last modification timestamp. */
+ out_uleb128 (DWARF2_FILE_TIME_NAME (files[i].filename,
+ files[i].dir ? dirs [files [i].dir] : ""));
+ /* Output the filesize. */
+ out_uleb128 (DWARF2_FILE_SIZE_NAME (files[i].filename,
+ files[i].dir ? dirs [files [i].dir] : ""));
}
/* Terminate filename list. */
out_byte (0);
}
+/* Switch to SEC and output a header length field. Return the size of
+ offsets used in SEC. The caller must set EXPR->X_add_symbol value
+ to the end of the section. EXPR->X_add_number will be set to the
+ negative size of the header. */
+
+static int
+out_header (asection *sec, expressionS *exp)
+{
+ symbolS *start_sym;
+ symbolS *end_sym;
+
+ subseg_set (sec, 0);
+
+ if (flag_dwarf_sections)
+ {
+ /* If we are going to put the start and end symbols in different
+ sections, then we need real symbols, not just fake, local ones. */
+ frag_now_fix ();
+ start_sym = symbol_make (".Ldebug_line_start");
+ end_sym = symbol_make (".Ldebug_line_end");
+ symbol_set_value_now (start_sym);
+ }
+ else
+ {
+ start_sym = symbol_temp_new_now ();
+ end_sym = symbol_temp_make ();
+ }
+
+ /* Total length of the information. */
+ exp->X_op = O_subtract;
+ exp->X_add_symbol = end_sym;
+ exp->X_op_symbol = start_sym;
+
+ switch (DWARF2_FORMAT (sec))
+ {
+ case dwarf2_format_32bit:
+ exp->X_add_number = -4;
+ emit_expr (exp, 4);
+ return 4;
+
+ case dwarf2_format_64bit:
+ exp->X_add_number = -12;
+ out_four (-1);
+ emit_expr (exp, 8);
+ return 8;
+
+ case dwarf2_format_64bit_irix:
+ exp->X_add_number = -8;
+ emit_expr (exp, 8);
+ return 8;
+ }
+
+ as_fatal (_("internal error: unknown dwarf2 format"));
+ return 0;
+}
+
/* Emit the collected .debug_line data. */
static void
-out_debug_line (line_seg)
- segT line_seg;
+out_debug_line (segT line_seg)
{
- expressionS expr;
- symbolS *line_start;
- symbolS *prologue_end;
+ expressionS exp;
+ symbolS *prologue_start, *prologue_end;
symbolS *line_end;
struct line_seg *s;
+ int sizeof_offset;
- 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);
+ sizeof_offset = out_header (line_seg, &exp);
+ line_end = exp.X_add_symbol;
/* Version. */
- out_two (2);
+ out_two (DWARF2_LINE_VERSION);
/* 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);
+ prologue_start = symbol_temp_make ();
+ prologue_end = symbol_temp_make ();
+ exp.X_op = O_subtract;
+ exp.X_add_symbol = prologue_end;
+ exp.X_op_symbol = prologue_start;
+ exp.X_add_number = 0;
+ emit_expr (&exp, sizeof_offset);
+ symbol_set_value_now (prologue_start);
/* Parameters of the state machine. */
out_byte (DWARF2_LINE_MIN_INSN_LENGTH);
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_byte (0); /* DW_LNS_set_prologue_end */
+ out_byte (0); /* DW_LNS_set_epilogue_begin */
+ out_byte (1); /* DW_LNS_set_isa */
out_file_list ();
- set_symbol_value_now (prologue_end);
+ symbol_set_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);
+ if (SEG_NORMAL (s->seg))
+ process_entries (s->seg, s->head->head);
+ else
+ as_warn ("dwarf line number information for %s ignored",
+ segment_name (s->seg));
+
+ if (flag_dwarf_sections)
+ /* We have to switch to the special .debug_line_end section
+ before emitting the end-of-debug_line symbol. The linker
+ script arranges for this section to be placed after all the
+ (potentially garbage collected) .debug_line.<foo> sections.
+ This section contains the line_end symbol which is used to
+ compute the size of the linked .debug_line section, as seen
+ in the DWARF Line Number header. */
+ subseg_set (subseg_get (".debug_line_end", FALSE), 0);
+
+ symbol_set_value_now (line_end);
}
-/* Emit data for .debug_aranges. */
-
static void
-out_debug_aranges (aranges_seg, info_seg)
- segT aranges_seg;
- segT info_seg;
+out_debug_ranges (segT ranges_seg)
{
unsigned int addr_size = sizeof_address;
- addressT size, skip;
struct line_seg *s;
- expressionS expr;
- char *p;
+ expressionS exp;
+ unsigned int i;
- size = 4 + 2 + 4 + 1 + 1;
+ subseg_set (ranges_seg, 0);
- skip = 2 * addr_size - (size & (2 * addr_size - 1));
- if (skip == 2 * addr_size)
- skip = 0;
- size += skip;
+ /* Base Address Entry. */
+ for (i = 0; i < addr_size; i++)
+ out_byte (0xff);
+ for (i = 0; i < addr_size; i++)
+ out_byte (0);
+ /* Range List Entry. */
for (s = all_segs; s; s = s->next)
- size += 2 * addr_size;
+ {
+ fragS *frag;
+ symbolS *beg, *end;
+
+ frag = first_frag_for_seg (s->seg);
+ beg = symbol_temp_new (s->seg, 0, frag);
+ s->text_start = beg;
- size += 2 * addr_size;
+ frag = last_frag_for_seg (s->seg);
+ end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag);
+ s->text_end = end;
+
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = beg;
+ exp.X_add_number = 0;
+ emit_expr (&exp, addr_size);
+
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = end;
+ exp.X_add_number = 0;
+ emit_expr (&exp, addr_size);
+ }
+
+ /* End of Range Entry. */
+ for (i = 0; i < addr_size; i++)
+ out_byte (0);
+ for (i = 0; i < addr_size; i++)
+ out_byte (0);
+}
- subseg_set (aranges_seg, 0);
+/* Emit data for .debug_aranges. */
+
+static void
+out_debug_aranges (segT aranges_seg, segT info_seg)
+{
+ unsigned int addr_size = sizeof_address;
+ offsetT size;
+ struct line_seg *s;
+ expressionS exp;
+ symbolS *aranges_end;
+ char *p;
+ int sizeof_offset;
- /* Length of the compilation unit. */
- out_four (size - 4);
+ sizeof_offset = out_header (aranges_seg, &exp);
+ aranges_end = exp.X_add_symbol;
+ size = -exp.X_add_number;
/* Version. */
- out_two (2);
+ out_two (DWARF2_ARANGES_VERSION);
+ size += 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);
+ TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), sizeof_offset);
+ size += sizeof_offset;
/* Size of an address (offset portion). */
out_byte (addr_size);
+ size++;
/* Size of a segment descriptor. */
out_byte (0);
+ size++;
/* Align the header. */
- if (skip)
- frag_align (ffs (2 * addr_size) - 1, 0, 0);
+ while ((size++ % (2 * addr_size)) > 0)
+ out_byte (0);
for (s = all_segs; s; s = s->next)
{
symbolS *beg, *end;
frag = first_frag_for_seg (s->seg);
- beg = symbol_new (fake_label_name, s->seg, 0, frag);
+ beg = symbol_temp_new (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);
+ end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), 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);
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = beg;
+ exp.X_add_number = 0;
+ emit_expr (&exp, 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);
+ exp.X_op = O_subtract;
+ exp.X_add_symbol = end;
+ exp.X_op_symbol = beg;
+ exp.X_add_number = 0;
+ emit_expr (&exp, 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);
+
+ symbol_set_value_now (aranges_end);
}
/* 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;
+out_debug_abbrev (segT abbrev_seg,
+ segT info_seg ATTRIBUTE_UNUSED,
+ segT line_seg ATTRIBUTE_UNUSED)
{
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 (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit)
+ out_abbrev (DW_AT_stmt_list, DW_FORM_data4);
+ else
+ out_abbrev (DW_AT_stmt_list, DW_FORM_data8);
if (all_segs->next == NULL)
{
out_abbrev (DW_AT_low_pc, DW_FORM_addr);
- out_abbrev (DW_AT_high_pc, DW_FORM_addr);
+ if (DWARF2_VERSION < 4)
+ out_abbrev (DW_AT_high_pc, DW_FORM_addr);
+ else
+ out_abbrev (DW_AT_high_pc, (sizeof_address == 4
+ ? DW_FORM_data4 : DW_FORM_data8));
}
+ else
+ {
+ if (DWARF2_FORMAT (info_seg) == dwarf2_format_32bit)
+ out_abbrev (DW_AT_ranges, DW_FORM_data4);
+ else
+ out_abbrev (DW_AT_ranges, DW_FORM_data8);
+ }
+ out_abbrev (DW_AT_name, DW_FORM_string);
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);
/* 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;
+out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg)
{
char producer[128];
- char *comp_dir;
- expressionS expr;
- symbolS *info_start;
+ const char *comp_dir;
+ const char *dirname;
+ expressionS exp;
symbolS *info_end;
char *p;
int len;
+ int sizeof_offset;
- 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);
+ sizeof_offset = out_header (info_seg, &exp);
+ info_end = exp.X_add_symbol;
/* DWARF version. */
- out_two (2);
+ out_two (DWARF2_VERSION);
/* .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);
+ TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset);
/* Target address size. */
out_byte (sizeof_address);
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);
+ TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg),
+ (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit
+ ? 4 : 8));
- /* These two attributes may only be emitted if all of the code is
- contiguous. Multiple sections are not that. */
+ /* These two attributes are emitted if all of the code is contiguous. */
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);
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = all_segs->text_start;
+ exp.X_add_number = 0;
+ emit_expr (&exp, 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);
+ if (DWARF2_VERSION < 4)
+ exp.X_op = O_symbol;
+ else
+ {
+ exp.X_op = O_subtract;
+ exp.X_op_symbol = all_segs->text_start;
+ }
+ exp.X_add_symbol = all_segs->text_end;
+ exp.X_add_number = 0;
+ emit_expr (&exp, sizeof_address);
+ }
+ else
+ {
+ /* This attribute is emitted if the code is disjoint. */
+ /* DW_AT_ranges. */
+ TC_DWARF2_EMIT_OFFSET (section_symbol (ranges_seg), sizeof_offset);
}
+ /* DW_AT_name. We don't have the actual file name that was present
+ on the command line, so assume files[1] is the main input file.
+ We're not supposed to get called unless at least one line number
+ entry was emitted, so this should always be defined. */
+ if (files_in_use == 0)
+ abort ();
+ if (files[1].dir)
+ {
+ dirname = remap_debug_filename (dirs[files[1].dir]);
+ len = strlen (dirname);
+#ifdef TE_VMS
+ /* Already has trailing slash. */
+ p = frag_more (len);
+ memcpy (p, dirname, len);
+#else
+ p = frag_more (len + 1);
+ memcpy (p, dirname, len);
+ INSERT_DIR_SEPARATOR (p, len);
+#endif
+ }
+ len = strlen (files[1].filename) + 1;
+ p = frag_more (len);
+ memcpy (p, files[1].filename, len);
+
/* DW_AT_comp_dir */
- comp_dir = getpwd ();
+ comp_dir = remap_debug_filename (getpwd ());
len = strlen (comp_dir) + 1;
p = frag_more (len);
memcpy (p, comp_dir, len);
dwarf2 draft has no standard code for assembler. */
out_two (DW_LANG_Mips_Assembler);
- set_symbol_value_now (info_end);
+ symbol_set_value_now (info_end);
+}
+
+void
+dwarf2_init (void)
+{
+ last_seg_ptr = &all_segs;
}
+
+/* Finish the dwarf2 debug sections. We emit .debug.line if there
+ were any .file/.loc directives, or --gdwarf2 was given, or if the
+ file has a non-empty .debug_info section and an empty .debug_line
+ section. If we emit .debug_line, and the .debug_info section is
+ empty, we also emit .debug_info, .debug_aranges and .debug_abbrev.
+ ALL_SEGS will be non-null if there were any .file/.loc directives,
+ or --gdwarf2 was given and there were any located instructions
+ emitted. */
+
void
-dwarf2_finish ()
+dwarf2_finish (void)
{
segT line_seg;
struct line_seg *s;
-
- /* If no debug information was recorded, nothing to do. */
- if (all_segs == NULL && files_in_use <= 1)
+ segT info_seg;
+ int emit_other_sections = 0;
+ int empty_debug_line = 0;
+
+ info_seg = bfd_get_section_by_name (stdoutput, ".debug_info");
+ emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg);
+
+ line_seg = bfd_get_section_by_name (stdoutput, ".debug_line");
+ empty_debug_line = line_seg == NULL || !seg_not_empty_p (line_seg);
+
+ /* We can't construct a new debug_line section if we already have one.
+ Give an error. */
+ if (all_segs && !empty_debug_line)
+ as_fatal ("duplicate .debug_line sections");
+
+ if ((!all_segs && emit_other_sections)
+ || (!emit_other_sections && !empty_debug_line))
+ /* If there is no line information and no non-empty .debug_info
+ section, or if there is both a non-empty .debug_info and a non-empty
+ .debug_line, then we do nothing. */
return;
/* Calculate the size of an address for the target machine. */
- sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8;
+ sizeof_address = DWARF2_ADDR_SIZE (stdoutput);
/* Create and switch to the line number section. */
line_seg = subseg_new (".debug_line", 0);
- bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY);
+ bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY | SEC_DEBUGGING);
/* 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;
+ struct line_subseg *lss = s->head;
+ struct line_entry **ptail = lss->ptail;
- while ((ss = ss->next) != NULL)
+ while ((lss = lss->next) != NULL)
{
- *ptail = ss->head;
- ptail = ss->ptail;
+ *ptail = lss->head;
+ ptail = lss->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)
+ /* If this is assembler generated line info, and there is no
+ debug_info already, we need .debug_info and .debug_abbrev
+ sections as well. */
+ if (emit_other_sections)
{
segT abbrev_seg;
- segT info_seg;
segT aranges_seg;
+ segT ranges_seg;
+
+ gas_assert (all_segs);
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);
+ bfd_set_section_flags (stdoutput, info_seg,
+ SEC_READONLY | SEC_DEBUGGING);
+ bfd_set_section_flags (stdoutput, abbrev_seg,
+ SEC_READONLY | SEC_DEBUGGING);
+ bfd_set_section_flags (stdoutput, aranges_seg,
+ SEC_READONLY | SEC_DEBUGGING);
record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1);
+ if (all_segs->next == NULL)
+ ranges_seg = NULL;
+ else
+ {
+ ranges_seg = subseg_new (".debug_ranges", 0);
+ bfd_set_section_flags (stdoutput, ranges_seg,
+ SEC_READONLY | SEC_DEBUGGING);
+ record_alignment (ranges_seg, ffs (2 * sizeof_address) - 1);
+ out_debug_ranges (ranges_seg);
+ }
+
out_debug_aranges (aranges_seg, info_seg);
- out_debug_abbrev (abbrev_seg);
- out_debug_info (info_seg, abbrev_seg, line_seg);
+ out_debug_abbrev (abbrev_seg, info_seg, line_seg);
+ out_debug_info (info_seg, abbrev_seg, line_seg, ranges_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 */
projects / thirdparty / binutils-gdb.git / blobdiff