/* dwarf2dbg.c - DWARF2 debug support
- Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+ Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ 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]
+*/
- FILENO is the filenumber. */
+#include "as.h"
+#include "safe-ctype.h"
-#include "ansidecl.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
-#include "as.h"
#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() dwarf2_format_32bit
+#endif
+
+#ifndef DWARF2_ADDR_SIZE
+# define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8)
+#endif
+
#include "subsegs.h"
#include "elf/dwarf2.h"
#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 0
+#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)
-
-struct line_entry
-{
+struct line_entry {
struct line_entry *next;
- fragS *frag;
- addressT frag_ofs;
+ symbolS *label;
struct dwarf2_line_info loc;
};
-struct line_subseg
-{
+struct line_subseg {
struct line_subseg *next;
subsegT subseg;
struct line_entry *head;
struct line_entry **ptail;
};
-struct line_seg
-{
+struct line_seg {
struct line_seg *next;
segT seg;
struct line_subseg *head;
/* Collects data for all line table entries during assembly. */
static struct line_seg *all_segs;
-struct file_entry
-{
- char *filename;
+struct file_entry {
+ const char *filename;
unsigned int dir;
};
static unsigned int files_in_use;
static unsigned int files_allocated;
-/* Correlate file numbers as given by the user in .file/.loc directives
- with the file numbers used in the output debug info. */
-static unsigned int *user_filenum;
-static unsigned int user_filenum_allocated;
+/* 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
+/* 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
+};
/* 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));
+static struct line_subseg *get_line_subseg (segT, subsegT);
+static unsigned int get_filenum (const char *, unsigned int);
+static struct frag *first_frag_for_seg (segT);
+static struct frag *last_frag_for_seg (segT);
+static void out_byte (int);
+static void out_opcode (int);
+static void out_two (int);
+static void out_four (int);
+static void out_abbrev (int, int);
+static void out_uleb128 (addressT);
+static offsetT get_frag_fix (fragS *, segT);
+static void out_set_addr (symbolS *);
+static int size_inc_line_addr (int, addressT);
+static void emit_inc_line_addr (int, addressT, char *, int);
+static int size_fixed_inc_line_addr (int, addressT);
+static void emit_fixed_inc_line_addr (int, addressT, fragS *, char *, int);
+static void out_inc_line_addr (int, addressT);
+static void relax_inc_line_addr (int, symbolS *, symbolS *);
+static void process_entries (segT, struct line_entry *);
+static void out_file_list (void);
+static void out_debug_line (segT);
+static void out_debug_aranges (segT, segT);
+static void out_debug_abbrev (segT);
\f
+#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)
+{
+ expressionS expr;
+
+ expr.X_op = O_symbol;
+ expr.X_add_symbol = symbol;
+ expr.X_add_number = 0;
+ emit_expr (&expr, size);
+}
+#endif
+
/* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */
static struct line_subseg *
-get_line_subseg (seg, subseg)
- segT seg;
- subsegT subseg;
+get_line_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_seg **ps, *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)
+ for (ps = &all_segs; (s = *ps) != NULL; ps = &s->next)
if (s->seg == seg)
goto found_seg;
s = (struct line_seg *) xmalloc (sizeof (*s));
- s->next = all_segs;
+ s->next = NULL;
s->seg = seg;
s->head = NULL;
- all_segs = s;
+ *ps = s;
found_seg:
for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next)
{
if (ss->subseg == subseg)
- goto found_subseg;
+ goto found_subseg;
if (ss->subseg > subseg)
break;
}
return ss;
}
-/* Record an entry for LOC ocurring at OFS within the current fragment. */
+/* Record an entry for LOC occurring at LABEL. */
-void
-dwarf2_gen_line_info (ofs, loc)
- addressT ofs;
- struct dwarf2_line_info *loc;
+static void
+dwarf2_gen_line_info_1 (symbolS *label, 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->label = label;
e->loc = *loc;
ss = get_line_subseg (now_seg, now_subseg);
ss->ptail = &e->next;
}
+/* Record an entry for LOC occurring at OFS within the current fragment. */
+
void
-dwarf2_where (line)
- struct dwarf2_line_info *line;
+dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc)
+{
+ 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;
+
+ /* Don't emit sequences of line symbols for the same line when the
+ symbols apply to assembler code. It is necessary to emit
+ duplicate line symbols when a compiler asks for them, because GDB
+ uses them to determine the end of the prologue. */
+ if (debug_type == DEBUG_DWARF2
+ && line == loc->line && filenum == loc->filenum)
+ return;
+
+ line = loc->line;
+ filenum = loc->filenum;
+
+ 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 (struct dwarf2_line_info *line)
{
if (debug_type == DEBUG_DWARF2)
{
char *filename;
as_where (&filename, &line->line);
- line->filenum = get_filenum (filename);
+ 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;
}
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 (debug_type != DEBUG_DWARF2 && ! loc_directive_seen)
+ if (dwarf2_loc_directive_seen)
+ {
+ /* 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;
+ }
+ else if (debug_type != DEBUG_DWARF2)
return;
- loc_directive_seen = false;
-
- dwarf2_where (&loc);
+ else
+ dwarf2_where (&loc);
+
dwarf2_gen_line_info (frag_now_fix () - size, &loc);
+ dwarf2_consume_line_info ();
}
-/* Get a .debug_line file number for FILENAME. */
+/* 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. */
+ if (debug_type != DEBUG_DWARF2)
+ dwarf2_loc_directive_seen = FALSE;
+
+ current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK
+ | DWARF2_FLAG_PROLOGUE_END
+ | DWARF2_FLAG_EPILOGUE_BEGIN);
+}
+
+/* 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 (debug_type == DEBUG_DWARF2)
+ dwarf2_where (&loc);
+ else
+ loc = current;
+
+ loc.flags |= DWARF2_FLAG_BASIC_BLOCK;
+
+ dwarf2_consume_line_info ();
+ dwarf2_gen_line_info_1 (label, &loc);
+}
+
+/* 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
+ && strcmp (filename, files[last_used].filename) == 0)
+ return last_used;
+ if (files[last_used].dir
+ && strncmp (filename, dirs[files[last_used].dir],
+ last_used_dir_len) == 0
+ && IS_DIR_SEPARATOR (filename [last_used_dir_len])
+ && strcmp (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)
+ {
+ --dir_len;
+ for (dir = 1; dir < dirs_in_use; ++dir)
+ if (strncmp (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 = (char **)
+ xrealloc (dirs, (dir + 32) * sizeof (const char *));
+ }
+
+ dirs[dir] = 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
+ && strcmp (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));
+ 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;
+ 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;
- const char *filename;
+ char *filename;
int filename_len;
/* Continue to accept a bare string and pass it off. */
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 < 0)
+ if (num < 1)
{
- as_bad (_("File number less than zero"));
- return;
+ as_bad (_("file number less than one"));
+ return NULL;
}
- if (num >= (int) user_filenum_allocated)
+ if (num < (int) files_in_use && files[num].filename != 0)
{
- unsigned int old = user_filenum_allocated;
-
- user_filenum_allocated = num + 16;
- user_filenum = (unsigned int *)
- xrealloc (user_filenum, (num + 16) * sizeof (unsigned int));
-
- /* Zero the new memory. */
- memset (user_filenum + old, 0, (num + 16 - old) * sizeof(unsigned int));
+ as_bad (_("file number %ld already allocated"), (long) num);
+ return NULL;
}
- user_filenum[num] = get_filenum (filename);
+ get_filenum (filename, num);
+
+ 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 && debug_type != DEBUG_DWARF2)
+ 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 < 0)
+ if (filenum < 1)
{
- as_bad (_("File number less than zero"));
+ as_bad (_("file number less than one"));
return;
}
- if (filenum >= (int) user_filenum_allocated
- || user_filenum[filenum] == 0)
+ if (filenum >= (int) files_in_use || files[filenum].filename == 0)
{
- as_bad (_("Unassigned file number %ld"), (long) filenum);
+ as_bad (_("unassigned file number %ld"), (long) filenum);
return;
}
- current.filenum = user_filenum[filenum];
+ 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);
+ {
+ if (files[filenum].dir)
+ {
+ size_t dir_len = strlen (dirs[files[filenum].dir]);
+ size_t file_len = strlen (files[filenum].filename);
+ char *cp = (char *) alloca (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);
+ }
+ 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;
+
+ p = input_line_pointer;
+ c = get_symbol_end ();
+
+ 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)
+ {
+ *input_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)
+ {
+ *input_line_pointer = c;
+ value = get_absolute_expression ();
+ if (value >= 0)
+ current.isa = value;
+ else
+ {
+ as_bad (_("isa number less than zero"));
+ return;
+ }
+ }
+ else
+ {
+ as_bad (_("unknown .loc sub-directive `%s'"), p);
+ *input_line_pointer = c;
+ return;
+ }
+
+ SKIP_WHITESPACE ();
+ }
+
+ demand_empty_rest_of_line ();
+ dwarf2_loc_directive_seen = TRUE;
}
+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_abbrev (int name, int 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;
+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)
- {
- return ((char *) obstack_next_free (&fr->frch_obstack)
- - frag->fr_literal);
- }
+ 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);
out_opcode (DW_LNS_extended_op);
out_uleb128 (sizeof_address + 1);
emit_expr (&expr, sizeof_address);
}
+#if DWARF2_LINE_MIN_INSN_LENGTH > 1
+static void scale_addr_delta (addressT *);
+
+static void
+scale_addr_delta (addressT *addr_delta)
+{
+ static int printed_this = 0;
+ if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0)
+ {
+ if (!printed_this)
+ as_bad("unaligned opcodes detected in executable segment");
+ printed_this = 1;
+ }
+ *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH;
+}
+#else
+#define scale_addr_delta(A)
+#endif
+
/* 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.
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. */
+ 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;
/* 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. */
+
+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 > 50000)
+ {
+ /* 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 *exp;
+ segT line_seg;
+ char *end = p + len;
+
+ /* Line number sequences cannot go backward in addresses. This means
+ we've incorrectly ordered the statements in the sequence. */
+ assert ((offsetT) addr_delta >= 0);
+
+ /* 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);
+ }
+
+ exp = symbol_get_value_expression (frag->fr_symbol);
+ line_seg = subseg_get (".debug_line", 0);
+
+ /* 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 > 50000)
+ {
+ symbolS *to_sym;
+ expressionS expr;
+
+ assert (exp->X_op = O_subtract);
+ to_sym = exp->X_add_symbol;
+
+ *p++ = DW_LNS_extended_op;
+ p += output_leb128 (p, sizeof_address + 1, 0);
+ *p++ = DW_LNE_set_address;
+ expr.X_op = O_symbol;
+ expr.X_add_symbol = to_sym;
+ expr.X_add_number = 0;
+ subseg_change (line_seg, 0);
+ emit_expr_fix (&expr, sizeof_address, frag, p);
+ p += sizeof_address;
+ }
+ else
+ {
+ *p++ = DW_LNS_fixed_advance_pc;
+ subseg_change (line_seg, 0);
+ emit_expr_fix (exp, 2, frag, p);
+ p += 2;
+ }
+
+ if (line_delta == INT_MAX)
+ {
+ *p++ = DW_LNS_extended_op;
+ *p++ = 1;
+ *p++ = DW_LNE_end_sequence;
+ }
+ else
+ *p++ = DW_LNS_copy;
+
+ 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;
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;
/* 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);
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, 0);
- size = size_inc_line_addr (frag->fr_offset, addr_delta);
+ addr_delta = resolve_symbol_value (frag->fr_symbol);
+ 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;
old_size = frag->fr_subtype;
new_size = dwarf2dbg_estimate_size_before_relax (frag);
-
+
return new_size - old_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, 1);
+ 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);
+ 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)
+ do
{
- int changed = 0;
+ 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 (isa != e->loc.isa)
{
- flags = e->loc.flags;
- out_opcode (DW_LNS_negate_stmt);
- changed = 1;
+ isa = e->loc.isa;
+ out_opcode (DW_LNS_set_isa);
+ out_uleb128 (isa);
}
- if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK)
+ if ((e->loc.flags ^ flags) & DWARF2_FLAG_IS_STMT)
{
- out_opcode (DW_LNS_set_basic_block);
- changed = 1;
+ flags = e->loc.flags;
+ out_opcode (DW_LNS_negate_stmt);
}
- if (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);
+ if (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK)
+ out_opcode (DW_LNS_set_basic_block);
- frag = e->frag;
- frag_ofs = e->frag_ofs;
- line = e->loc.line;
- }
- else if (frag == NULL)
+ 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. */
+ line_delta = e->loc.line - line;
+ lab = e->label;
+ frag = symbol_get_frag (lab);
+ frag_ofs = S_GET_VALUE (lab);
+
+ 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)
{
+ 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;
cp = frag_more (size);
memcpy (cp, files[i].filename, size);
/* 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;
symbolS *line_end;
struct line_seg *s;
+ enum dwarf2_format d2f;
+ 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);
+ line_start = symbol_temp_new_now ();
+ prologue_end = symbol_temp_make ();
+ line_end = symbol_temp_make ();
/* 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);
+
+ d2f = DWARF2_FORMAT ();
+ if (d2f == dwarf2_format_32bit)
+ {
+ expr.X_add_number = -4;
+ emit_expr (&expr, 4);
+ sizeof_offset = 4;
+ }
+ else if (d2f == dwarf2_format_64bit)
+ {
+ expr.X_add_number = -12;
+ out_four (-1);
+ emit_expr (&expr, 8);
+ sizeof_offset = 8;
+ }
+ else if (d2f == dwarf2_format_64bit_irix)
+ {
+ expr.X_add_number = -8;
+ emit_expr (&expr, 8);
+ sizeof_offset = 8;
+ }
+ else
+ {
+ as_fatal (_("internal error: unknown dwarf2 format"));
+ }
/* Version. */
out_two (2);
expr.X_add_symbol = prologue_end;
expr.X_op_symbol = line_start;
expr.X_add_number = - (4 + 2 + 4);
- emit_expr (&expr, 4);
+ emit_expr (&expr, sizeof_offset);
/* 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)
+ for (s = all_segs; s; s = s->next)
process_entries (s->seg, s->head->head);
- set_symbol_value_now (line_end);
+ symbol_set_value_now (line_end);
+}
+
+static void
+out_debug_ranges (segT ranges_seg)
+{
+ unsigned int addr_size = sizeof_address;
+ struct line_seg *s;
+ expressionS expr;
+ unsigned int i;
+
+ subseg_set (ranges_seg, 0);
+
+ /* 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)
+ {
+ fragS *frag;
+ symbolS *beg, *end;
+
+ frag = first_frag_for_seg (s->seg);
+ beg = symbol_temp_new (s->seg, 0, frag);
+ s->text_start = beg;
+
+ frag = last_frag_for_seg (s->seg);
+ 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);
+
+ expr.X_op = O_symbol;
+ expr.X_add_symbol = end;
+ expr.X_add_number = 0;
+ emit_expr (&expr, 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);
}
/* Emit data for .debug_aranges. */
static void
-out_debug_aranges (aranges_seg, info_seg)
- segT aranges_seg;
- segT info_seg;
+out_debug_aranges (segT aranges_seg, segT info_seg)
{
unsigned int addr_size = sizeof_address;
addressT size, skip;
size = 4 + 2 + 4 + 1 + 1;
- skip = 2*addr_size - (size & (2*addr_size - 1));
- if (skip == 2*addr_size)
+ 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;
+ for (s = all_segs; s; s = s->next)
+ size += 2 * addr_size;
- size += 2*addr_size;
+ size += 2 * addr_size;
subseg_set (aranges_seg, 0);
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);
+ /* ??? sizeof_offset */
+ TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), 4);
/* Size of an address (offset portion). */
out_byte (addr_size);
/* Align the header. */
if (skip)
- frag_align (ffs (2*addr_size) - 1, 0, 0);
+ frag_align (ffs (2 * addr_size) - 1, 0, 0);
- for (s = all_segs; s ; s = s->next)
+ 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);
+ 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;
sync with out_debug_info below. */
static void
-out_debug_abbrev (abbrev_seg)
- segT abbrev_seg;
+out_debug_abbrev (segT abbrev_seg)
{
subseg_set (abbrev_seg, 0);
out_abbrev (DW_AT_low_pc, DW_FORM_addr);
out_abbrev (DW_AT_high_pc, DW_FORM_addr);
}
+ else
+ {
+ if (DWARF2_FORMAT () == 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);
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;
+out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg)
{
char producer[128];
- char *comp_dir;
+ const char *comp_dir;
+ const char *dirname;
expressionS expr;
symbolS *info_start;
symbolS *info_end;
char *p;
int len;
+ enum dwarf2_format d2f;
+ int sizeof_offset;
subseg_set (info_seg, 0);
- info_start = symbol_new_now();
- info_end = symbol_make (fake_label_name);
+ info_start = symbol_temp_new_now ();
+ info_end = symbol_temp_make ();
/* 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);
+
+ d2f = DWARF2_FORMAT ();
+ if (d2f == dwarf2_format_32bit)
+ {
+ expr.X_add_number = -4;
+ emit_expr (&expr, 4);
+ sizeof_offset = 4;
+ }
+ else if (d2f == dwarf2_format_64bit)
+ {
+ expr.X_add_number = -12;
+ out_four (-1);
+ emit_expr (&expr, 8);
+ sizeof_offset = 8;
+ }
+ else if (d2f == dwarf2_format_64bit_irix)
+ {
+ expr.X_add_number = -8;
+ emit_expr (&expr, 8);
+ sizeof_offset = 8;
+ }
+ else
+ {
+ as_fatal (_("internal error: unknown dwarf2 format"));
+ }
/* 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);
+ 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);
+ /* ??? sizeof_offset */
+ TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), 4);
- /* 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_add_number = 0;
emit_expr (&expr, 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 || files_in_use < 1)
+ abort ();
+ if (files[1].dir)
+ {
+ dirname = remap_debug_filename (dirs[files[1].dir]);
+ len = strlen (dirname);
+ p = frag_more (len + 1);
+ memcpy (p, dirname, len);
+ INSERT_DIR_SEPARATOR (p, len);
+ }
+ 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);
}
+/* 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. 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;
+ segT info_seg;
+ int emit_other_sections = 0;
+
+ info_seg = bfd_get_section_by_name (stdoutput, ".debug_info");
+ emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg);
- /* If no debug information was recorded, nothing to do. */
- if (all_segs == NULL)
+ if (!all_segs && emit_other_sections)
+ /* There is no line information and no non-empty .debug_info
+ section. */
return;
/* Calculate the size of an address for the target machine. */
-#ifdef BFD_ASSEMBLER
- sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8;
-#else
- /* FIXME. */
- sizeof_address = 4;
-#endif
+ sizeof_address = DWARF2_ADDR_SIZE (stdoutput);
/* Create and switch to the line number section. */
line_seg = subseg_new (".debug_line", 0);
-#ifdef BFD_ASSEMBLER
- bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY);
-#endif
+ 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)
+ for (s = all_segs; s; s = s->next)
{
struct line_subseg *ss = s->head;
struct line_entry **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 (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;
+ assert (all_segs);
+
info_seg = subseg_new (".debug_info", 0);
abbrev_seg = subseg_new (".debug_abbrev", 0);
aranges_seg = subseg_new (".debug_aranges", 0);
-#ifdef BFD_ASSEMBLER
- 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);
-#endif
+ 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);
- 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_info (info_seg, abbrev_seg, line_seg, ranges_seg);
}
}