/* dwarf2dbg.c - DWARF2 debug support
- Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+ Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
This file is part of GAS, the GNU Assembler.
FILENO is the filenumber. */
#include "ansidecl.h"
-
#include "as.h"
+
+#ifdef HAVE_LIMITS_H
+#include <limits.h>
+#else
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+#ifndef INT_MAX
+#define INT_MAX (int) (((unsigned) (-1)) >> 1)
+#endif
+#endif
+
#include "dwarf2dbg.h"
+#include <filenames.h>
+
+#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
+
+
+#ifdef BFD_ASSEMBLER
+
#include "subsegs.h"
#include "elf/dwarf2.h"
is not made available by the GCC front-end. */
#define DWARF2_LINE_DEFAULT_IS_STMT 1
-/* Flag that indicates the initial value of the is_stmt_start flag.
- In the present implementation, we do not mark any lines as
- the beginning of a source statement, because that information
- is not made available by the GCC front-end. */
-#define DWARF2_LINE_DEFAULT_IS_STMT 1
-
/* Given a special op, return the line skip amount. */
#define SPECIAL_LINE(op) \
(((op) - DWARF2_LINE_OPCODE_BASE)%DWARF2_LINE_RANGE + DWARF2_LINE_BASE)
/* The maximum address skip amount that can be encoded with a special op. */
#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255)
-#define INITIAL_STATE \
- /* Initialize as per DWARF2.0 standard. */ \
- 0, /* address */ \
- 1, /* file */ \
- 1, /* line */ \
- 0, /* column */ \
- DWARF2_LINE_DEFAULT_IS_STMT, /* is_stmt */ \
- 0, /* basic_block */ \
- 1 /* empty_sequence */
-
-static struct {
- /* state machine state as per DWARF2 manual: */
- struct dwarf2_sm {
- addressT addr;
- unsigned int filenum;
- unsigned int line;
- unsigned int column;
- unsigned int
- is_stmt : 1,
- basic_block : 1,
- empty_sequence : 1; /* current code sequence has no DWARF2 directives? */
- } sm;
-
- unsigned int
- any_dwarf2_directives : 1; /* did we emit any DWARF2 line debug directives? */
-
- fragS * frag; /* frag that "addr" is relative to */
- segT text_seg; /* text segment "addr" is relative to */
- subsegT text_subseg;
- segT line_seg; /* ".debug_line" segment */
- int last_filename; /* index of last filename that was used */
- int num_filenames; /* index of last filename in use */
- int filename_len; /* length of the filename array */
- struct {
- int dir; /* valid after gen_dir_list() only */
- char *name; /* full path before gen_dir_list(), filename afterwards */
- } *file;
-
- struct dwarf2_line_info current; /* current source info */
-
- /* counters for statistical purposes */
- unsigned int num_line_entries;
- unsigned int opcode_hist[256]; /* histogram of opcode frequencies */
-} ls = {
- {
- INITIAL_STATE
- },
- 0,
- 0,
- 0,
- 0,
- 0,
- 0,
- 0,
- 0,
- NULL,
- { NULL, 0, 0, 0, 0 },
- 0,
- {
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
- }
+struct line_entry {
+ struct line_entry *next;
+ fragS *frag;
+ addressT frag_ofs;
+ struct dwarf2_line_info loc;
};
-/* Function prototypes. */
+struct line_subseg {
+ struct line_subseg *next;
+ subsegT subseg;
+ struct line_entry *head;
+ struct line_entry **ptail;
+};
+
+struct line_seg {
+ struct line_seg *next;
+ segT seg;
+ struct line_subseg *head;
+ symbolS *text_start;
+ symbolS *text_end;
+};
+
+/* Collects data for all line table entries during assembly. */
+static struct line_seg *all_segs;
+
+struct file_entry {
+ const char *filename;
+ unsigned int dir;
+};
+
+/* Table of files used by .debug_line. */
+static struct file_entry *files;
+static unsigned int files_in_use;
+static unsigned int files_allocated;
+
+/* 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 bfd_boolean loc_directive_seen;
+
+/* Current location as indicated by the most recent .loc directive. */
+static struct dwarf2_line_info current;
+
+/* Fake label name. */
+static char const fake_label_name[] = ".L0\001";
+
+/* The size of an address on the target. */
+static unsigned int sizeof_address;
+\f
+static struct line_subseg *get_line_subseg PARAMS ((segT, subsegT));
+static unsigned int get_filenum PARAMS ((const char *, unsigned int));
+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 void out_sleb128 PARAMS ((offsetT));
-static void gen_addr_line PARAMS ((int, addressT));
-static void reset_state_machine PARAMS ((void));
-static void out_set_addr PARAMS ((addressT));
-static void out_end_sequence PARAMS ((void));
-static int get_filenum PARAMS ((int, char *));
-static void gen_dir_list PARAMS ((void));
-static void gen_file_list PARAMS ((void));
-static void print_stats PARAMS ((unsigned long));
-static addressT now_subseg_size PARAMS ((void));
-
-#define out_byte(byte) FRAG_APPEND_1_CHAR(byte)
-#define out_opcode(opc) (out_byte ((opc)), ++ls.opcode_hist[(opc) & 0xff])
-
-/* Output an unsigned "little-endian base 128" number. */
+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 struct line_subseg *
+get_line_subseg (seg, subseg)
+ segT seg;
+ subsegT subseg;
+{
+ static segT last_seg;
+ static subsegT last_subseg;
+ static struct line_subseg *last_line_subseg;
-static void
-out_uleb128 (value)
- addressT value;
+ struct line_seg *s;
+ struct line_subseg **pss, *ss;
+
+ if (seg == last_seg && subseg == last_subseg)
+ return last_line_subseg;
+
+ for (s = all_segs; s; s = s->next)
+ if (s->seg == seg)
+ goto found_seg;
+
+ s = (struct line_seg *) xmalloc (sizeof (*s));
+ s->next = all_segs;
+ s->seg = seg;
+ s->head = NULL;
+ all_segs = s;
+
+ found_seg:
+ for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next)
+ {
+ if (ss->subseg == subseg)
+ goto found_subseg;
+ if (ss->subseg > subseg)
+ break;
+ }
+
+ ss = (struct line_subseg *) xmalloc (sizeof (*ss));
+ ss->next = *pss;
+ ss->subseg = subseg;
+ ss->head = NULL;
+ ss->ptail = &ss->head;
+ *pss = ss;
+
+ found_subseg:
+ last_seg = seg;
+ last_subseg = subseg;
+ last_line_subseg = ss;
+
+ return ss;
+}
+
+/* Record an entry for LOC ocurring at OFS within the current fragment. */
+
+void
+dwarf2_gen_line_info (ofs, loc)
+ addressT ofs;
+ struct dwarf2_line_info *loc;
{
- unsigned char byte, more = 0x80;
+ struct line_subseg *ss;
+ struct line_entry *e;
+ static unsigned int line = -1;
+ static unsigned int filenum = -1;
+
+ /* 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;
+
+ e = (struct line_entry *) xmalloc (sizeof (*e));
+ e->next = NULL;
+ e->frag = frag_now;
+ e->frag_ofs = ofs;
+ e->loc = *loc;
- do
+ ss = get_line_subseg (now_seg, now_subseg);
+ *ss->ptail = e;
+ ss->ptail = &e->next;
+}
+
+void
+dwarf2_where (line)
+ struct dwarf2_line_info *line;
+{
+ if (debug_type == DEBUG_DWARF2)
{
- byte = value & 0x7f;
- value >>= 7;
- if (value == 0)
- more = 0;
- out_byte (more | byte);
+ char *filename;
+ as_where (&filename, &line->line);
+ line->filenum = get_filenum (filename, 0);
+ line->column = 0;
+ line->flags = DWARF2_FLAG_BEGIN_STMT;
}
- while (more);
+ else
+ *line = current;
}
-/* Output a signed "little-endian base 128" number. */
+/* 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. */
-static void
-out_sleb128 (value)
- offsetT value;
+void
+dwarf2_emit_insn (size)
+ int size;
{
- unsigned char byte, more = 0x80;
+ struct dwarf2_line_info loc;
- do
+ if (loc_directive_seen)
{
- byte = value & 0x7f;
- value >>= 7;
- if (((value == 0) && ((byte & 0x40) == 0))
- || ((value == -1) && ((byte & 0x40) != 0)))
- more = 0;
- out_byte (more | byte);
+ /* 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;
}
- while (more);
+ else if (debug_type != DEBUG_DWARF2)
+ return;
+ else
+ dwarf2_where (& loc);
+
+ dwarf2_gen_line_info (frag_now_fix () - size, &loc);
}
-/* 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. */
+/* 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 void
-gen_addr_line (line_delta, addr_delta)
- int line_delta;
- addressT addr_delta;
+static unsigned int
+get_filenum (filename, num)
+ const char *filename;
+ unsigned int num;
{
- unsigned int tmp, opcode;
+ static unsigned int last_used, last_used_dir_len;
+ const char *file;
+ size_t dir_len;
+ unsigned int i, dir;
- tmp = line_delta - DWARF2_LINE_BASE;
+ 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;
+ }
- if (tmp >= DWARF2_LINE_RANGE)
+ 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)
{
- out_opcode (DW_LNS_advance_line);
- out_sleb128 (line_delta);
- tmp = 0 - DWARF2_LINE_BASE;
- line_delta = 0;
+ --dir_len;
+ for (dir = 1; dir < dirs_in_use; ++dir)
+ if (memcmp (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;
+ }
}
- tmp += DWARF2_LINE_OPCODE_BASE;
+ if (num == 0)
+ {
+ for (i = 1; i < files_in_use; ++i)
+ if (files[i].dir == dir
+ && strcmp (file, files[i].filename) == 0)
+ {
+ last_used = i;
+ last_used_dir_len = dir_len;
+ return i;
+ }
+ }
+ else
+ i = num;
- /* Try using a special opcode. */
- opcode = tmp + addr_delta * DWARF2_LINE_RANGE;
- if (opcode <= 255)
+ if (i >= files_allocated)
{
- out_opcode (opcode);
- return;
+ unsigned int old = files_allocated;
+
+ files_allocated = i + 32;
+ files = (struct file_entry *)
+ xrealloc (files, (i + 32) * sizeof (struct file_entry));
+
+ memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry));
+ }
+
+ files[i].filename = num ? file : xstrdup (file);
+ files[i].dir = dir;
+ files_in_use = i + 1;
+ last_used = i;
+ last_used_dir_len = dir_len;
+
+ return i;
+}
+
+/* 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
+
+ If an entry is added to the file table, return a pointer to the filename. */
+
+char *
+dwarf2_directive_file (dummy)
+ int dummy ATTRIBUTE_UNUSED;
+{
+ offsetT num;
+ char *filename;
+ int filename_len;
+
+ /* Continue to accept a bare string and pass it off. */
+ SKIP_WHITESPACE ();
+ if (*input_line_pointer == '"')
+ {
+ s_app_file (0);
+ return NULL;
+ }
+
+ num = get_absolute_expression ();
+ filename = demand_copy_C_string (&filename_len);
+ demand_empty_rest_of_line ();
+
+ if (num < 1)
+ {
+ as_bad (_("file number less than one"));
+ return NULL;
+ }
+
+ if (num < (int) files_in_use && files[num].filename != 0)
+ {
+ as_bad (_("file number %ld already allocated"), (long) num);
+ return NULL;
}
- /* Try using DW_LNS_const_add_pc followed by special op. */
- opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE;
- if (opcode <= 255)
+ get_filenum (filename, num);
+
+ return filename;
+}
+
+void
+dwarf2_directive_loc (dummy)
+ int dummy ATTRIBUTE_UNUSED;
+{
+ offsetT filenum, line, column;
+
+ filenum = get_absolute_expression ();
+ SKIP_WHITESPACE ();
+ line = get_absolute_expression ();
+ SKIP_WHITESPACE ();
+ column = get_absolute_expression ();
+ demand_empty_rest_of_line ();
+
+ if (filenum < 1)
+ {
+ as_bad (_("file number less than one"));
+ return;
+ }
+ if (filenum >= (int) files_in_use || files[filenum].filename == 0)
{
- out_opcode (DW_LNS_const_add_pc);
- out_opcode (opcode);
+ as_bad (_("unassigned file number %ld"), (long) filenum);
return;
}
- out_opcode (DW_LNS_advance_pc);
- out_uleb128 (addr_delta);
+ current.filenum = filenum;
+ current.line = line;
+ current.column = column;
+ current.flags = DWARF2_FLAG_BEGIN_STMT;
- if (line_delta)
- /* Output line-delta. */
- out_opcode (tmp);
- else
- /* Append new row with current info. */
- out_opcode (DW_LNS_copy);
+ loc_directive_seen = TRUE;
+
+#ifndef NO_LISTING
+ if (listing)
+ {
+ 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);
+ 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
+}
+\f
+static struct frag *
+first_frag_for_seg (seg)
+ segT seg;
+{
+ frchainS *f, *first = NULL;
+
+ for (f = frchain_root; f; f = f->frch_next)
+ if (f->frch_seg == seg
+ && (! first || first->frch_subseg > f->frch_subseg))
+ first = f;
+
+ return first ? first->frch_root : NULL;
}
+static struct frag *
+last_frag_for_seg (seg)
+ segT seg;
+{
+ frchainS *f, *last = NULL;
+
+ for (f = frchain_root; f; f = f->frch_next)
+ if (f->frch_seg == seg
+ && (! last || last->frch_subseg < f->frch_subseg))
+ last= f;
+
+ return last ? last->frch_last : NULL;
+}
+\f
+/* Emit a single byte into the current segment. */
+
+static inline void
+out_byte (byte)
+ int byte;
+{
+ FRAG_APPEND_1_CHAR (byte);
+}
+
+/* Emit a statement program opcode into the current segment. */
+
+static inline void
+out_opcode (opc)
+ int opc;
+{
+ out_byte (opc);
+}
+
+/* Emit a two-byte word into the current segment. */
+
+static inline void
+out_two (data)
+ int data;
+{
+ md_number_to_chars (frag_more (2), data, 2);
+}
+
+/* Emit a four byte word into the current segment. */
+
+static inline void
+out_four (data)
+ int data;
+{
+ md_number_to_chars (frag_more (4), data, 4);
+}
+
+/* Emit an unsigned "little-endian base 128" number. */
+
static void
-reset_state_machine ()
+out_uleb128 (value)
+ addressT value;
+{
+ output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0);
+}
+
+/* Emit a tuple for .debug_abbrev. */
+
+static inline void
+out_abbrev (name, form)
+ int name, form;
{
- static const struct dwarf2_sm initial_state = { INITIAL_STATE };
+ out_uleb128 (name);
+ out_uleb128 (form);
+}
- ls.sm = initial_state;
+/* 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 an absolute address (may results in a relocation entry). */
+/* Set the value of SYM to the current position in the current segment. */
static void
-out_set_addr (addr)
- addressT addr;
+set_symbol_value_now (sym)
+ symbolS *sym;
{
- subsegT saved_subseg;
- segT saved_seg;
- expressionS expr;
- symbolS *sym;
- int bytes_per_address;
+ S_SET_SEGMENT (sym, now_seg);
+ S_SET_VALUE (sym, frag_now_fix ());
+ symbol_set_frag (sym, frag_now);
+}
- saved_seg = now_seg;
- saved_subseg = now_subseg;
+/* Get the size of a fragment. */
- subseg_set (ls.text_seg, ls.text_subseg);
- sym = symbol_new (".L0\001", now_seg, addr, frag_now);
+static offsetT
+get_frag_fix (frag)
+ fragS *frag;
+{
+ frchainS *fr;
+
+ if (frag->fr_next)
+ return frag->fr_fix;
+
+ /* If a fragment is the last in the chain, special measures must be
+ taken to find its size before relaxation, since it may be pending
+ on some subsegment chain. */
+ for (fr = frchain_root; fr; fr = fr->frch_next)
+ if (fr->frch_last == frag)
+ {
+ 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;
+ }
+
+ abort ();
+}
- subseg_set (saved_seg, saved_subseg);
+/* Set an absolute address (may result in a relocation entry). */
-#ifdef BFD_ASSEMBLER
- bytes_per_address = bfd_arch_bits_per_address (stdoutput) / 8;
-#else
- /* FIXME. */
- bytes_per_address = 4;
-#endif
+static void
+out_set_addr (seg, frag, ofs)
+ segT seg;
+ fragS *frag;
+ addressT ofs;
+{
+ expressionS expr;
+ symbolS *sym;
+
+ sym = symbol_new (fake_label_name, seg, ofs, frag);
out_opcode (DW_LNS_extended_op);
- out_uleb128 (bytes_per_address + 1);
+ 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, bytes_per_address);
+ emit_expr (&expr, sizeof_address);
}
-/* Emit DW_LNS_end_sequence and reset state machine. Does not
- preserve the current segment/sub-segment! */
+#if DWARF2_LINE_MIN_INSN_LENGTH > 1
+static void scale_addr_delta PARAMS ((addressT *));
static void
-out_end_sequence ()
+scale_addr_delta (addr_delta)
+ addressT *addr_delta;
{
- addressT addr, delta;
- fragS *text_frag;
-
- if (ls.text_seg)
+ static int printed_this = 0;
+ if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0)
{
- subseg_set (ls.text_seg, ls.text_subseg);
-#ifdef md_current_text_addr
- addr = md_current_text_addr ();
+ if (!printed_this)
+ as_bad("unaligned opcodes detected in executable segment");
+ printed_this = 1;
+ }
+ *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH;
+}
#else
- addr = frag_now_fix ();
+#define scale_addr_delta(A)
#endif
- text_frag = frag_now;
- subseg_set (ls.line_seg, DL_BODY);
- if (text_frag != ls.frag)
- {
- out_set_addr (addr);
- ls.sm.addr = addr;
- ls.frag = text_frag;
- }
- else
- {
- delta = (addr - ls.sm.addr) / DWARF2_LINE_MIN_INSN_LENGTH;
- if (delta > 0)
- {
- /* Advance address without updating the line-debug
- matrix---the end_sequence entry is used only to tell
- the debugger the end of the sequence. */
- out_opcode (DW_LNS_advance_pc);
- out_uleb128 (delta);
- }
- }
- }
- else
- subseg_set (ls.line_seg, DL_BODY);
-
- out_opcode (DW_LNS_extended_op);
- out_uleb128 (1);
- out_byte (DW_LNE_end_sequence);
- reset_state_machine ();
-}
+/* 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.
-/* Look up a filenumber either by filename or by filenumber. If both
- a filenumber and a filename are specified, lookup by filename takes
- precedence. If the filename cannot be found, it is added to the
- filetable and the filenumber for the new entry is returned. */
+ The following two routines *must* be kept in sync. This is
+ enforced by making emit_inc_line_addr abort if we do not emit
+ exactly the expected number of bytes. */
static int
-get_filenum (filenum, file)
- int filenum;
- char *file;
+size_inc_line_addr (line_delta, addr_delta)
+ int line_delta;
+ addressT addr_delta;
{
- int i, last = filenum - 1;
- char char0 = file[0];
+ unsigned int tmp, opcode;
+ int len = 0;
- /* If filenum is out of range of the filename table, then try using the
- table entry returned from the previous call. */
- if (last >= ls.num_filenames || last < 0)
- last = ls.last_filename;
+ /* Scale the address delta by the minimum instruction length. */
+ scale_addr_delta (&addr_delta);
- /* Do a quick check against the specified or previously used filenum. */
- if (ls.num_filenames > 0 && ls.file[last].name[0] == char0
- && strcmp (ls.file[last].name + 1, file + 1) == 0)
- return last + 1;
+ /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence.
+ We cannot use special opcodes here, since we want the end_sequence
+ to emit the matrix entry. */
+ if (line_delta == INT_MAX)
+ {
+ if (addr_delta == MAX_SPECIAL_ADDR_DELTA)
+ len = 1;
+ else
+ len = 1 + sizeof_leb128 (addr_delta, 0);
+ return len + 3;
+ }
- /* No match, fall back to simple linear scan. */
- for (i = 0; i < ls.num_filenames; ++i)
+ /* Bias the line delta by the base. */
+ tmp = line_delta - DWARF2_LINE_BASE;
+
+ /* If the line increment is out of range of a special opcode, we
+ must encode it with DW_LNS_advance_line. */
+ if (tmp >= DWARF2_LINE_RANGE)
{
- if (ls.file[i].name[0] == char0
- && strcmp (ls.file[i].name + 1, file + 1) == 0)
- {
- ls.last_filename = i;
- return i + 1;
- }
+ len = 1 + sizeof_leb128 (line_delta, 1);
+ line_delta = 0;
+ tmp = 0 - DWARF2_LINE_BASE;
}
- /* No match, enter new filename. */
- if (ls.num_filenames >= ls.filename_len)
+ /* Bias the opcode by the special opcode base. */
+ tmp += DWARF2_LINE_OPCODE_BASE;
+
+ /* Avoid overflow when addr_delta is large. */
+ if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA)
{
- ls.filename_len += 13;
- ls.file = xrealloc (ls.file, ls.filename_len * sizeof (ls.file[0]));
+ /* Try using a special opcode. */
+ opcode = tmp + addr_delta * DWARF2_LINE_RANGE;
+ if (opcode <= 255)
+ return len + 1;
+
+ /* Try using DW_LNS_const_add_pc followed by special op. */
+ opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE;
+ if (opcode <= 255)
+ return len + 2;
}
- ls.file[ls.num_filenames].dir = 0;
- ls.file[ls.num_filenames].name = file;
- ls.last_filename = ls.num_filenames;
- return ++ls.num_filenames;
-}
-/* Emit an entry in the line number table if the address or line has changed.
- ADDR is relative to the current frag in the text section. */
+ /* Otherwise use DW_LNS_advance_pc. */
+ len += 1 + sizeof_leb128 (addr_delta, 0);
-void
-dwarf2_gen_line_info (addr, l)
- addressT addr;
- struct dwarf2_line_info *l;
+ /* DW_LNS_copy or special opcode. */
+ len += 1;
+
+ return len;
+}
+
+static void
+emit_inc_line_addr (line_delta, addr_delta, p, len)
+ int line_delta;
+ addressT addr_delta;
+ char *p;
+ int len;
{
- unsigned int filenum = l->filenum;
- unsigned int any_output = 0;
- subsegT saved_subseg;
- segT saved_seg;
- fragS *saved_frag;
+ unsigned int tmp, opcode;
+ int need_copy = 0;
+ char *end = p + len;
- if (flag_debug)
- fprintf (stderr, "line: addr %lx file `%s' line %u col %u flags %x\n",
- (unsigned long) addr, l->filename, l->line, l->column, l->flags);
+ /* Scale the address delta by the minimum instruction length. */
+ scale_addr_delta (&addr_delta);
- if (filenum > 0 && !l->filename)
+ /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence.
+ We cannot use special opcodes here, since we want the end_sequence
+ to emit the matrix entry. */
+ if (line_delta == INT_MAX)
{
- if (filenum >= (unsigned int) ls.num_filenames)
+ if (addr_delta == MAX_SPECIAL_ADDR_DELTA)
+ *p++ = DW_LNS_const_add_pc;
+ else
{
- as_warn ("Encountered bad file number in line number debug info!");
- return;
+ *p++ = DW_LNS_advance_pc;
+ p += output_leb128 (p, addr_delta, 0);
}
+
+ *p++ = DW_LNS_extended_op;
+ *p++ = 1;
+ *p++ = DW_LNE_end_sequence;
+ goto done;
}
- else if (l->filename)
- filenum = get_filenum (filenum, l->filename);
- else
- /* No filename, no filnum => no play. */
- return;
- /* Must save these before the subseg_new call, as that call will change
- them. */
- saved_seg = now_seg;
- saved_subseg = now_subseg;
- saved_frag = frag_now;
+ /* Bias the line delta by the base. */
+ tmp = line_delta - DWARF2_LINE_BASE;
- if (!ls.line_seg)
+ /* If the line increment is out of range of a special opcode, we
+ must encode it with DW_LNS_advance_line. */
+ if (tmp >= DWARF2_LINE_RANGE)
{
-#ifdef BFD_ASSEMBLER
- symbolS *secsym;
-#endif
-
- ls.line_seg = subseg_new (".debug_line", 0);
+ *p++ = DW_LNS_advance_line;
+ p += output_leb128 (p, line_delta, 1);
-#ifdef BFD_ASSEMBLER
- bfd_set_section_flags (stdoutput, ls.line_seg, SEC_READONLY);
+ /* 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;
+ }
- /* We're going to need this symbol. */
- secsym = symbol_find (".debug_line");
- if (secsym != NULL)
- symbol_set_bfdsym (secsym, ls.line_seg->symbol);
- else
- symbol_table_insert (section_symbol (ls.line_seg));
-#endif
+ line_delta = 0;
+ tmp = 0 - DWARF2_LINE_BASE;
+ need_copy = 1;
}
- subseg_set (ls.line_seg, DL_BODY);
+ /* Bias the opcode by the special opcode base. */
+ tmp += DWARF2_LINE_OPCODE_BASE;
- if (ls.text_seg != saved_seg || ls.text_subseg != saved_subseg)
+ /* Avoid overflow when addr_delta is large. */
+ if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA)
{
- if (!ls.sm.empty_sequence)
+ /* Try using a special opcode. */
+ opcode = tmp + addr_delta * DWARF2_LINE_RANGE;
+ if (opcode <= 255)
{
- /* Terminate previous sequence. */
- out_end_sequence ();
- ls.sm.empty_sequence = 1;
+ *p++ = opcode;
+ goto done;
}
- any_output = 1;
- ls.text_seg = saved_seg;
- ls.text_subseg = saved_subseg;
- out_set_addr (addr);
- ls.sm.addr = addr;
- ls.frag = saved_frag;
- }
- if (ls.sm.filenum != filenum)
- {
- any_output = 1;
- out_opcode (DW_LNS_set_file);
- out_uleb128 (filenum);
- ls.sm.filenum = filenum;
- }
-
- if (ls.sm.column != l->column)
- {
- any_output = 1;
- out_opcode (DW_LNS_set_column);
- out_uleb128 (l->column);
- ls.sm.column = l->column;
+ /* Try using DW_LNS_const_add_pc followed by special op. */
+ opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA) * DWARF2_LINE_RANGE;
+ if (opcode <= 255)
+ {
+ *p++ = DW_LNS_const_add_pc;
+ *p++ = opcode;
+ goto done;
+ }
}
- if (((l->flags & DWARF2_FLAG_BEGIN_STMT) != 0) != ls.sm.is_stmt)
- {
- any_output = 1;
- out_opcode (DW_LNS_negate_stmt);
- }
+ /* Otherwise use DW_LNS_advance_pc. */
+ *p++ = DW_LNS_advance_pc;
+ p += output_leb128 (p, addr_delta, 0);
- if (l->flags & DWARF2_FLAG_BEGIN_BLOCK)
- {
- any_output = 1;
- out_opcode (DW_LNS_set_basic_block);
- }
+ if (need_copy)
+ *p++ = DW_LNS_copy;
+ else
+ *p++ = tmp;
- if (ls.sm.line != l->line)
- {
- any_output = 1;
- if (saved_frag != ls.frag)
- {
- /* If a new frag got allocated (for whatever reason), then
- deal with it by generating a reference symbol. Note: no
- end_sequence needs to be generated because the address did
- not really decrease (only the reference point changed). */
- out_set_addr (addr);
- ls.sm.addr = addr;
- ls.frag = saved_frag;
- }
- gen_addr_line (l->line - ls.sm.line,
- (addr - ls.sm.addr) / DWARF2_LINE_MIN_INSN_LENGTH);
- ls.sm.basic_block = 0;
- ls.sm.line = l->line;
- ls.sm.addr = addr;
- }
+ done:
+ assert (p == end);
+}
- subseg_set (saved_seg, saved_subseg);
+/* Handy routine to combine calls to the above two routines. */
- ls.num_line_entries += any_output;
- if (any_output)
- ls.sm.empty_sequence = 0;
+static void
+out_inc_line_addr (line_delta, addr_delta)
+ int line_delta;
+ addressT addr_delta;
+{
+ int len = size_inc_line_addr (line_delta, addr_delta);
+ emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len);
}
+/* Generate a variant frag that we can use to relax address/line
+ increments between fragments of the target segment. */
+
static void
-gen_dir_list ()
+relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs)
+ int line_delta;
+ segT seg;
+ fragS *to_frag, *from_frag;
+ addressT to_ofs, from_ofs;
+{
+ symbolS *to_sym, *from_sym;
+ expressionS expr;
+ int max_chars;
+
+ to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag);
+ from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag);
+
+ expr.X_op = O_subtract;
+ expr.X_add_symbol = to_sym;
+ expr.X_op_symbol = from_sym;
+ expr.X_add_number = 0;
+
+ /* The maximum size of the frag is the line delta with a maximum
+ sized address delta. */
+ max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH);
+
+ frag_var (rs_dwarf2dbg, max_chars, max_chars, 1,
+ make_expr_symbol (&expr), line_delta, NULL);
+}
+
+/* The function estimates the size of a rs_dwarf2dbg variant frag
+ based on the current values of the symbols. It is called before
+ the relaxation loop. We set fr_subtype to the expected length. */
+
+int
+dwarf2dbg_estimate_size_before_relax (frag)
+ fragS *frag;
+{
+ offsetT addr_delta;
+ int size;
+
+ addr_delta = resolve_symbol_value (frag->fr_symbol);
+ size = size_inc_line_addr (frag->fr_offset, addr_delta);
+
+ frag->fr_subtype = size;
+
+ return size;
+}
+
+/* This function relaxes a rs_dwarf2dbg variant frag based on the
+ current values of the symbols. fr_subtype is the current length
+ of the frag. This returns the change in frag length. */
+
+int
+dwarf2dbg_relax_frag (frag)
+ fragS *frag;
+{
+ int old_size, new_size;
+
+ old_size = frag->fr_subtype;
+ new_size = dwarf2dbg_estimate_size_before_relax (frag);
+
+ return new_size - old_size;
+}
+
+/* This function converts a rs_dwarf2dbg variant frag into a normal
+ fill frag. This is called after all relaxation has been done.
+ fr_subtype will be the desired length of the frag. */
+
+void
+dwarf2dbg_convert_frag (frag)
+ fragS *frag;
{
- char *str, *slash, *dir_list, *dp, *cp;
- int i, j, num_dirs;
+ offsetT addr_diff;
+
+ addr_diff = resolve_symbol_value (frag->fr_symbol);
+
+ /* fr_var carries the max_chars that we created the fragment with.
+ fr_subtype carries the current expected length. We must, of
+ course, have allocated enough memory earlier. */
+ assert (frag->fr_var >= (int) frag->fr_subtype);
- dir_list = frag_more (0);
- num_dirs = 0;
+ emit_inc_line_addr (frag->fr_offset, addr_diff,
+ frag->fr_literal + frag->fr_fix, frag->fr_subtype);
- for (i = 0; i < ls.num_filenames; ++i)
+ frag->fr_fix += frag->fr_subtype;
+ frag->fr_type = rs_fill;
+ frag->fr_var = 0;
+ frag->fr_offset = 0;
+}
+
+/* Generate .debug_line content for the chain of line number entries
+ beginning at E, for segment SEG. */
+
+static void
+process_entries (seg, e)
+ segT seg;
+ struct line_entry *e;
+{
+ unsigned filenum = 1;
+ unsigned line = 1;
+ unsigned column = 0;
+ unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_BEGIN_STMT : 0;
+ fragS *frag = NULL;
+ fragS *last_frag;
+ addressT frag_ofs = 0;
+ addressT last_frag_ofs;
+ struct line_entry *next;
+
+ while (e)
{
- str = ls.file[i].name;
- slash = strrchr (str, '/');
- if (slash)
+ int changed = 0;
+
+ if (filenum != e->loc.filenum)
{
- *slash = '\0';
- for (j = 0, dp = dir_list; j < num_dirs; ++j)
- {
- if (strcmp (str, dp) == 0)
- {
- ls.file[i].dir = j + 1;
- break;
- }
- dp += strlen (dp);
- }
- if (j >= num_dirs)
+ filenum = e->loc.filenum;
+ out_opcode (DW_LNS_set_file);
+ out_uleb128 (filenum);
+ changed = 1;
+ }
+
+ if (column != e->loc.column)
+ {
+ column = e->loc.column;
+ out_opcode (DW_LNS_set_column);
+ out_uleb128 (column);
+ changed = 1;
+ }
+
+ if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT)
+ {
+ flags = e->loc.flags;
+ out_opcode (DW_LNS_negate_stmt);
+ changed = 1;
+ }
+
+ if (e->loc.flags & DWARF2_FLAG_BEGIN_BLOCK)
+ {
+ out_opcode (DW_LNS_set_basic_block);
+ changed = 1;
+ }
+
+ /* Don't try to optimize away redundant entries; gdb wants two
+ entries for a function where the code starts on the same line as
+ the {, and there's no way to identify that case here. Trust gcc
+ to optimize appropriately. */
+ if (1 /* line != e->loc.line || changed */)
+ {
+ int line_delta = e->loc.line - line;
+ if (frag == NULL)
{
- /* Didn't find this directory: append it to the list. */
- size_t size = strlen (str) + 1;
- cp = frag_more (size);
- memcpy (cp, str, size);
- ls.file[i].dir = ++num_dirs;
+ out_set_addr (seg, e->frag, e->frag_ofs);
+ out_inc_line_addr (line_delta, 0);
}
- *slash = '/';
- ls.file[i].name = slash + 1;
+ else if (frag == e->frag)
+ out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs);
+ else
+ relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs,
+ frag, frag_ofs);
+
+ frag = e->frag;
+ frag_ofs = e->frag_ofs;
+ line = e->loc.line;
+ }
+ else if (frag == NULL)
+ {
+ out_set_addr (seg, e->frag, e->frag_ofs);
+ frag = e->frag;
+ frag_ofs = e->frag_ofs;
}
+
+ next = e->next;
+ free (e);
+ e = next;
}
- /* Terminate directory list. */
- out_byte ('\0');
+ /* Emit a DW_LNE_end_sequence for the end of the section. */
+ last_frag = last_frag_for_seg (seg);
+ last_frag_ofs = get_frag_fix (last_frag);
+ if (frag == last_frag)
+ out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs);
+ else
+ relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs,
+ frag, frag_ofs);
}
+/* Emit the directory and file tables for .debug_line. */
+
static void
-gen_file_list ()
+out_file_list ()
{
size_t size;
char *cp;
- int i;
+ unsigned int i;
- for (i = 0; i < ls.num_filenames; ++i)
+ /* Emit directory list. */
+ for (i = 1; i < dirs_in_use; ++i)
{
- size = strlen (ls.file[i].name) + 1;
+ size = strlen (dirs[i]) + 1;
cp = frag_more (size);
- memcpy (cp, ls.file[i].name, size);
+ memcpy (cp, dirs[i], size);
+ }
+ /* Terminate it. */
+ out_byte ('\0');
- out_uleb128 (ls.file[i].dir); /* directory number */
+ for (i = 1; i < files_in_use; ++i)
+ {
+ if (files[i].filename == NULL)
+ {
+ as_bad (_("unassigned file number %ld"), (long) i);
+ continue;
+ }
+
+ size = strlen (files[i].filename) + 1;
+ cp = frag_more (size);
+ memcpy (cp, files[i].filename, size);
+
+ out_uleb128 (files[i].dir); /* directory number */
out_uleb128 (0); /* last modification timestamp */
out_uleb128 (0); /* filesize */
}
out_byte (0);
}
+/* Emit the collected .debug_line data. */
+
static void
-print_stats (total_size)
- unsigned long total_size;
+out_debug_line (line_seg)
+ segT line_seg;
{
- static const char *opc_name[] = {
- "extended", "copy", "advance_pc", "advance_line", "set_file",
- "set_column", "negate_stmt", "set_basic_block", "const_add_pc",
- "fixed_advance_pc"
- };
- size_t i;
- int j;
+ 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);
+
+ /* 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;
+
+ 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"));
+ }
- fprintf (stderr, "Average size: %g bytes/line\n",
- total_size / (double) ls.num_line_entries);
+ /* Version. */
+ out_two (2);
+
+ /* Length of the prologue following this length. */
+ expr.X_op = O_subtract;
+ expr.X_add_symbol = prologue_end;
+ expr.X_op_symbol = line_start;
+ expr.X_add_number = - (4 + 2 + 4);
+ emit_expr (&expr, sizeof_offset);
+
+ /* Parameters of the state machine. */
+ out_byte (DWARF2_LINE_MIN_INSN_LENGTH);
+ out_byte (DWARF2_LINE_DEFAULT_IS_STMT);
+ out_byte (DWARF2_LINE_BASE);
+ out_byte (DWARF2_LINE_RANGE);
+ out_byte (DWARF2_LINE_OPCODE_BASE);
+
+ /* Standard opcode lengths. */
+ out_byte (0); /* DW_LNS_copy */
+ out_byte (1); /* DW_LNS_advance_pc */
+ out_byte (1); /* DW_LNS_advance_line */
+ out_byte (1); /* DW_LNS_set_file */
+ out_byte (1); /* DW_LNS_set_column */
+ out_byte (0); /* DW_LNS_negate_stmt */
+ out_byte (0); /* DW_LNS_set_basic_block */
+ out_byte (0); /* DW_LNS_const_add_pc */
+ out_byte (1); /* DW_LNS_fixed_advance_pc */
+
+ out_file_list ();
+
+ set_symbol_value_now (prologue_end);
+
+ /* For each section, emit a statement program. */
+ for (s = all_segs; s; s = s->next)
+ process_entries (s->seg, s->head->head);
+
+ set_symbol_value_now (line_end);
+}
- fprintf (stderr, "\nStandard opcode histogram:\n");
+/* Emit data for .debug_aranges. */
- for (i = 0; i < sizeof (opc_name) / sizeof (opc_name[0]); ++i)
- {
- fprintf (stderr, "%s", opc_name[i]);
- for (j = strlen (opc_name[i]); j < 16; ++j)
- fprintf (stderr, " ");
- fprintf (stderr, ": %u\n", ls.opcode_hist[i]);
- }
+static void
+out_debug_aranges (aranges_seg, info_seg)
+ segT aranges_seg;
+ segT info_seg;
+{
+ unsigned int addr_size = sizeof_address;
+ addressT size, skip;
+ struct line_seg *s;
+ expressionS expr;
+ char *p;
- fprintf (stderr, "\nSpecial opcodes:\naddr\t\t\t\tline skip\n");
+ size = 4 + 2 + 4 + 1 + 1;
- fprintf (stderr, "skip: ");
- for (j = DWARF2_LINE_BASE; j < DWARF2_LINE_BASE + DWARF2_LINE_RANGE; ++j)
- fprintf (stderr, "%3d", j);
- fprintf (stderr, "\n-----");
+ skip = 2 * addr_size - (size & (2 * addr_size - 1));
+ if (skip == 2 * addr_size)
+ skip = 0;
+ size += skip;
- for (; i < 256; ++i)
+ for (s = all_segs; s; s = s->next)
+ size += 2 * addr_size;
+
+ size += 2 * addr_size;
+
+ subseg_set (aranges_seg, 0);
+
+ /* Length of the compilation unit. */
+ out_four (size - 4);
+
+ /* Version. */
+ out_two (2);
+
+ /* Offset to .debug_info. */
+ expr.X_op = O_symbol;
+ expr.X_add_symbol = section_symbol (info_seg);
+ expr.X_add_number = 0;
+ emit_expr (&expr, 4);
+
+ /* Size of an address (offset portion). */
+ out_byte (addr_size);
+
+ /* Size of a segment descriptor. */
+ out_byte (0);
+
+ /* Align the header. */
+ if (skip)
+ frag_align (ffs (2 * addr_size) - 1, 0, 0);
+
+ for (s = all_segs; s; s = s->next)
{
- j = SPECIAL_LINE (i);
- if (j == DWARF2_LINE_BASE)
- fprintf (stderr, "\n%4u: ",
- (unsigned int) (DWARF2_LINE_MIN_INSN_LENGTH
- * SPECIAL_ADDR (i)));
- fprintf (stderr, " %2u", ls.opcode_hist[i]);
+ fragS *frag;
+ symbolS *beg, *end;
+
+ frag = first_frag_for_seg (s->seg);
+ beg = symbol_new (fake_label_name, s->seg, 0, frag);
+ s->text_start = beg;
+
+ frag = last_frag_for_seg (s->seg);
+ end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag);
+ s->text_end = end;
+
+ expr.X_op = O_symbol;
+ expr.X_add_symbol = beg;
+ expr.X_add_number = 0;
+ emit_expr (&expr, addr_size);
+
+ expr.X_op = O_subtract;
+ expr.X_add_symbol = end;
+ expr.X_op_symbol = beg;
+ expr.X_add_number = 0;
+ emit_expr (&expr, addr_size);
}
- fprintf (stderr, "\n");
+
+ p = frag_more (2 * addr_size);
+ md_number_to_chars (p, 0, addr_size);
+ md_number_to_chars (p + addr_size, 0, addr_size);
}
-/* Compute the size of the current subsegment, taking all fragments
- into account. Note that we don't generate variant frags, so the
- fixed portion is all we need to consider. */
+/* Emit data for .debug_abbrev. Note that this must be kept in
+ sync with out_debug_info below. */
-static addressT
-now_subseg_size ()
+static void
+out_debug_abbrev (abbrev_seg)
+ segT abbrev_seg;
{
- struct frag *f;
- addressT size = 0;
+ subseg_set (abbrev_seg, 0);
- for (f = frchain_now->frch_root; f ; f = f->fr_next)
- size += f->fr_fix;
+ out_uleb128 (1);
+ out_uleb128 (DW_TAG_compile_unit);
+ out_byte (DW_CHILDREN_no);
+ out_abbrev (DW_AT_stmt_list, DW_FORM_data4);
+ if (all_segs->next == NULL)
+ {
+ out_abbrev (DW_AT_low_pc, DW_FORM_addr);
+ out_abbrev (DW_AT_high_pc, DW_FORM_addr);
+ }
+ out_abbrev (DW_AT_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);
- return size + frag_now_fix_octets ();
+ /* Terminate the abbreviations for this compilation unit. */
+ out_byte (0);
}
-void
-dwarf2_finish ()
+/* 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;
{
- addressT body_size, total_size, prolog_size;
- subsegT saved_subseg;
- segT saved_seg;
- char *cp;
+ char producer[128];
+ char *comp_dir;
+ expressionS expr;
+ symbolS *info_start;
+ symbolS *info_end;
+ char *p;
+ int len;
+ enum dwarf2_format d2f;
+ int sizeof_offset;
- if (!ls.line_seg)
- /* No .debug_line segment, no work to do. */
- return;
+ subseg_set (info_seg, 0);
- saved_seg = now_seg;
- saved_subseg = now_subseg;
-
- if (!ls.sm.empty_sequence)
- out_end_sequence ();
- subseg_set (ls.line_seg, DL_BODY);
- total_size = body_size = now_subseg_size ();
-
- /* Now generate the directory and file lists. */
- subseg_set (ls.line_seg, DL_FILES);
- gen_dir_list ();
- gen_file_list ();
- total_size += now_subseg_size ();
-
- /* And now the header ("statement program prolog", in DWARF2 lingo...). */
- subseg_set (ls.line_seg, DL_PROLOG);
-
- cp = frag_more (15 + DWARF2_LINE_OPCODE_BASE - 1);
-
- total_size += now_subseg_size ();
- prolog_size = total_size - body_size - 10;
-
-#define STUFF(val,size) \
- do { \
- md_number_to_chars (cp, val, size); \
- cp += size; \
- } while (0)
-
- STUFF (total_size - 4, 4); /* length */
- STUFF (2, 2); /* version */
- STUFF (prolog_size, 4); /* prologue_length */
- STUFF (DWARF2_LINE_MIN_INSN_LENGTH, 1);
- STUFF (DWARF2_LINE_DEFAULT_IS_STMT, 1);
- STUFF (DWARF2_LINE_BASE, 1);
- STUFF (DWARF2_LINE_RANGE, 1);
- STUFF (DWARF2_LINE_OPCODE_BASE, 1);
-
- /* standard_opcode_lengths: */
- STUFF (0, 1); /* DW_LNS_copy */
- STUFF (1, 1); /* DW_LNS_advance_pc */
- STUFF (1, 1); /* DW_LNS_advance_line */
- STUFF (1, 1); /* DW_LNS_set_file */
- STUFF (1, 1); /* DW_LNS_set_column */
- STUFF (0, 1); /* DW_LNS_negate_stmt */
- STUFF (0, 1); /* DW_LNS_set_basic_block */
- STUFF (0, 1); /* DW_LNS_const_add_pc */
- STUFF (1, 1); /* DW_LNS_fixed_advance_pc */
-
-#undef STUFF
-
- /* If this is assembler generated line info, add a .debug_info
- section as well. */
- if (debug_type == DEBUG_DWARF2)
- {
- segT info_seg = subseg_new (".debug_info", 0);
- segT abbrev_seg = subseg_new (".debug_abbrev", 0);
- char *len;
+ info_start = symbol_new_now ();
+ info_end = symbol_make (fake_label_name);
-#ifdef BFD_ASSEMBLER
- bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY);
- bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY);
-#endif
+ /* Compilation Unit length. */
+ expr.X_op = O_subtract;
+ expr.X_add_symbol = info_end;
+ expr.X_op_symbol = info_start;
- subseg_set (info_seg, 0);
- len = frag_more (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"));
+ }
-#define STUFF(val, size) \
- do { \
- cp = frag_more (size); \
- md_number_to_chars (cp, (val), (size)); \
- } while(0)
+ /* DWARF version. */
+ out_two (2);
- STUFF (2, 2); /* Dwarf version */
- STUFF (0, 4); /* Offset into (final!) .debug_abbrev. */
+ /* .debug_abbrev offset */
+ expr.X_op = O_symbol;
+ expr.X_add_symbol = section_symbol (abbrev_seg);
+ expr.X_add_number = 0;
+ emit_expr (&expr, sizeof_offset);
- /* Pointer size. */
-#ifdef BFD_ASSEMBLER
- STUFF (bfd_arch_bits_per_address (stdoutput) / 8, 1);
-#else
- STUFF (4, 1);
-#endif
+ /* Target address size. */
+ out_byte (sizeof_address);
- /* FIXME: Add a DW_TAG_compile_unit DIE. The line info cannot
- even be seen without it. */
+ /* DW_TAG_compile_unit DIE abbrev */
+ out_uleb128 (1);
- /* Set size of debug_info. */
- md_number_to_chars (len, now_subseg_size () - 4, 4);
- }
+ /* 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);
- subseg_set (saved_seg, saved_subseg);
+ /* These two attributes may only be emitted if all of the code is
+ contiguous. Multiple sections are not that. */
+ if (all_segs->next == NULL)
+ {
+ /* DW_AT_low_pc */
+ expr.X_op = O_symbol;
+ expr.X_add_symbol = all_segs->text_start;
+ expr.X_add_number = 0;
+ emit_expr (&expr, sizeof_address);
+
+ /* DW_AT_high_pc */
+ expr.X_op = O_symbol;
+ expr.X_add_symbol = all_segs->text_end;
+ expr.X_add_number = 0;
+ emit_expr (&expr, sizeof_address);
+ }
- if (flag_debug)
- print_stats (total_size);
+ /* 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)
+ {
+ len = strlen (dirs[files[1].dir]);
+ p = frag_more (len + 1);
+ memcpy (p, dirs[files[1].dir], len);
+ 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 ();
+ len = strlen (comp_dir) + 1;
+ p = frag_more (len);
+ memcpy (p, comp_dir, len);
+
+ /* DW_AT_producer */
+ sprintf (producer, "GNU AS %s", VERSION);
+ len = strlen (producer) + 1;
+ p = frag_more (len);
+ memcpy (p, producer, len);
+
+ /* DW_AT_language. Yes, this is probably not really MIPS, but the
+ dwarf2 draft has no standard code for assembler. */
+ out_two (DW_LANG_Mips_Assembler);
+
+ set_symbol_value_now (info_end);
}
void
-dwarf2_directive_file (dummy)
- int dummy ATTRIBUTE_UNUSED;
+dwarf2_finish ()
{
- int len;
+ segT line_seg;
+ struct line_seg *s;
+
+ /* We don't need to do anything unless:
+ - Some debug information was recorded via .file/.loc
+ - or, we are generating DWARF2 information ourself (--gdwarf2)
+ - or, there is a user-provided .debug_info section which could
+ reference the file table in the .debug_line section we generate
+ below. */
+ if (all_segs == NULL
+ && debug_type != DEBUG_DWARF2
+ && bfd_get_section_by_name (stdoutput, ".debug_info") == NULL)
+ return;
- /* Continue to accept a bare string and pass it off. */
- SKIP_WHITESPACE ();
- if (*input_line_pointer == '"')
+ /* Calculate the size of an address for the target machine. */
+ 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);
+
+ /* For each subsection, chain the debug entries together. */
+ for (s = all_segs; s; s = s->next)
{
- s_app_file (0);
- return;
+ struct line_subseg *ss = s->head;
+ struct line_entry **ptail = ss->ptail;
+
+ while ((ss = ss->next) != NULL)
+ {
+ *ptail = ss->head;
+ ptail = ss->ptail;
+ }
}
- ls.any_dwarf2_directives = 1;
+ out_debug_line (line_seg);
- ls.current.filenum = get_absolute_expression ();
- ls.current.filename = demand_copy_C_string (&len);
+ /* If this is assembler generated line info, we need .debug_info
+ and .debug_abbrev sections as well. */
+ if (all_segs != NULL && debug_type == DEBUG_DWARF2)
+ {
+ segT abbrev_seg;
+ segT info_seg;
+ segT aranges_seg;
- demand_empty_rest_of_line ();
+ info_seg = subseg_new (".debug_info", 0);
+ abbrev_seg = subseg_new (".debug_abbrev", 0);
+ aranges_seg = subseg_new (".debug_aranges", 0);
+
+ bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY);
+ bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY);
+ bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY);
+
+ record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1);
+
+ out_debug_aranges (aranges_seg, info_seg);
+ out_debug_abbrev (abbrev_seg);
+ out_debug_info (info_seg, abbrev_seg, line_seg);
+ }
}
+#else
void
-dwarf2_directive_loc (dummy)
- int dummy ATTRIBUTE_UNUSED;
+dwarf2_finish ()
{
- ls.any_dwarf2_directives = 1;
-
- ls.current.filenum = get_absolute_expression ();
- SKIP_WHITESPACE ();
- ls.current.line = get_absolute_expression ();
- SKIP_WHITESPACE ();
- ls.current.column = get_absolute_expression ();
- demand_empty_rest_of_line ();
+}
- ls.current.flags = DWARF2_FLAG_BEGIN_STMT;
+int
+dwarf2dbg_estimate_size_before_relax (frag)
+ fragS *frag ATTRIBUTE_UNUSED;
+{
+ as_fatal (_("dwarf2 is not supported for this object file format"));
+ return 0;
+}
-#ifndef NO_LISTING
- if (listing)
- listing_source_line (ls.current.line);
-#endif
+int
+dwarf2dbg_relax_frag (frag)
+ fragS *frag ATTRIBUTE_UNUSED;
+{
+ as_fatal (_("dwarf2 is not supported for this object file format"));
+ return 0;
}
void
-dwarf2_where (line)
- struct dwarf2_line_info *line;
+dwarf2dbg_convert_frag (frag)
+ fragS *frag ATTRIBUTE_UNUSED;
{
- if (debug_type == DEBUG_DWARF2)
- {
- as_where (&line->filename, &line->line);
- line->filenum = 0;
- line->column = 0;
- line->flags = DWARF2_FLAG_BEGIN_STMT;
- }
- else
- *line = ls.current;
+ as_fatal (_("dwarf2 is not supported for this object file format"));
}
-/* 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;
+ int size ATTRIBUTE_UNUSED;
{
- addressT addr;
- struct dwarf2_line_info debug_line;
-
- if (debug_type != DEBUG_DWARF2 && ! ls.any_dwarf2_directives)
- return;
-
- /* Reset any_dwarf2_directives so that we won't waste time
- determining that no information has changed between insns. */
- ls.any_dwarf2_directives = 0;
-
- /* First update the notion of the current source line. */
- dwarf2_where (&debug_line);
+}
- /* We want the offset of the start of this
- instruction within the the current frag. */
- addr = frag_now_fix () - size;
+char *
+dwarf2_directive_file (dummy)
+ int dummy ATTRIBUTE_UNUSED;
+{
+ s_app_file (0);
+ return NULL;
+}
- /* And record the information. */
- dwarf2_gen_line_info (addr, &debug_line);
+void
+dwarf2_directive_loc (dummy)
+ int dummy ATTRIBUTE_UNUSED;
+{
+ as_fatal (_("dwarf2 is not supported for this object file format"));
}
+#endif /* BFD_ASSEMBLER */
projects / deliverable / binutils-gdb.git / blobdiff