X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gas%2Fdwarf2dbg.c;h=85c1f30e89898c8d70f9752523c15825058abed4;hb=ffa54e5c48223b42840f93e56a5eff69998ab4e1;hp=578b3ac226a0198c34d16f7ae6f258aaa9b62a09;hpb=a3b754347958261ec9fcaa627d57540fed673e2d;p=deliverable%2Fbinutils-gdb.git diff --git a/gas/dwarf2dbg.c b/gas/dwarf2dbg.c index 578b3ac226..85c1f30e89 100644 --- a/gas/dwarf2dbg.c +++ b/gas/dwarf2dbg.c @@ -1,12 +1,13 @@ /* dwarf2dbg.c - DWARF2 debug support - Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc. + Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 + Free Software Foundation, Inc. Contributed by David Mosberger-Tang 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, @@ -16,19 +17,20 @@ You should have received a copy of the GNU General Public License along with GAS; see the file COPYING. If not, write to the Free - Software Foundation, 59 Temple Place - Suite 330, Boston, MA - 02111-1307, USA. */ + Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA + 02110-1301, USA. */ /* Logical line numbers can be controlled by the compiler via the - following two directives: + following directives: .file FILENO "file.c" - .loc FILENO LINENO [COLUMN] + .loc FILENO LINENO [COLUMN] [basic_block] [prologue_end] \ + [epilogue_begin] [is_stmt VALUE] [isa VALUE] \ + [discriminator VALUE] +*/ - FILENO is the filenumber. */ - -#include "ansidecl.h" #include "as.h" +#include "safe-ctype.h" #ifdef HAVE_LIMITS_H #include @@ -42,16 +44,54 @@ #endif #include "dwarf2dbg.h" +#include + +#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 +# define DWARF2_FORMAT(SEC) dwarf2_format_32bit +#endif + +#ifndef DWARF2_ADDR_SIZE +# define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) +#endif + +#ifndef DWARF2_FILE_NAME +#define DWARF2_FILE_NAME(FILENAME, DIRNAME) FILENAME +#endif + +#ifndef DWARF2_FILE_TIME_NAME +#define DWARF2_FILE_TIME_NAME(FILENAME,DIRNAME) 0 #endif -#ifdef BFD_ASSEMBLER +#ifndef DWARF2_FILE_SIZE_NAME +#define DWARF2_FILE_SIZE_NAME(FILENAME,DIRNAME) 0 +#endif #include "subsegs.h" -#include "elf/dwarf2.h" +#include "dwarf2.h" /* Since we can't generate the prolog until the body is complete, we use three different subsegments for .debug_line: one holding the @@ -61,11 +101,18 @@ #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 @@ -84,10 +131,7 @@ # 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. */ @@ -103,8 +147,7 @@ struct line_entry { struct line_entry *next; - fragS *frag; - addressT frag_ofs; + symbolS *label; struct dwarf2_line_info loc; }; @@ -125,9 +168,13 @@ struct line_seg { /* Collects data for all line table entries during assembly. */ static struct line_seg *all_segs; +/* Hash used to quickly lookup a segment by name, avoiding the need to search + through the all_segs list. */ +static struct hash_control *all_segs_hash; +static struct line_seg **last_seg_ptr; struct file_entry { - char *filename; + const char *filename; unsigned int dir; }; @@ -136,109 +183,127 @@ static struct file_entry *files; static unsigned int files_in_use; static unsigned int files_allocated; -/* True when we've seen a .loc directive recently. Used to avoid +/* Table of directories used by .debug_line. */ +static char **dirs; +static unsigned int dirs_in_use; +static unsigned int dirs_allocated; + +/* TRUE when we've seen a .loc directive recently. Used to avoid doing work when there's nothing to do. */ -static boolean loc_directive_seen; +bfd_boolean dwarf2_loc_directive_seen; -/* Current location as indicated by the most recent .loc directive. */ -static struct dwarf2_line_info current; +/* TRUE when we're supposed to set the basic block mark whenever a + label is seen. */ +bfd_boolean dwarf2_loc_mark_labels; -/* Fake label name. */ -static char const fake_label_name[] = ".L0\001"; +/* Current location as indicated by the most recent .loc directive. */ +static struct dwarf2_line_info current = { + 1, 1, 0, 0, + DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, + 0 +}; /* The size of an address on the target. */ static unsigned int sizeof_address; -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 void scale_addr_delta PARAMS ((int *)); - +static unsigned int get_filenum (const char *, unsigned int); + +#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 exp; + + exp.X_op = O_symbol; + exp.X_add_symbol = symbol; + exp.X_add_number = 0; + emit_expr (&exp, 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_subseg **pss, *ss; + struct line_subseg **pss, *lss; 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; + s = (struct line_seg *) hash_find (all_segs_hash, seg->name); + if (s == NULL) + { + s = (struct line_seg *) xmalloc (sizeof (*s)); + s->next = NULL; + s->seg = seg; + s->head = NULL; + *last_seg_ptr = s; + last_seg_ptr = &s->next; + hash_insert (all_segs_hash, seg->name, s); + } + gas_assert (seg == s->seg); - found_seg: - for (pss = &s->head; (ss = *pss) != NULL ; pss = &ss->next) + for (pss = &s->head; (lss = *pss) != NULL ; pss = &lss->next) { - if (ss->subseg == subseg) + if (lss->subseg == subseg) goto found_subseg; - if (ss->subseg > subseg) + if (lss->subseg > subseg) break; } - ss = (struct line_subseg *) xmalloc (sizeof (*ss)); - ss->next = *pss; - ss->subseg = subseg; - ss->head = NULL; - ss->ptail = &ss->head; - *pss = ss; + lss = (struct line_subseg *) xmalloc (sizeof (*lss)); + lss->next = *pss; + lss->subseg = subseg; + lss->head = NULL; + lss->ptail = &lss->head; + *pss = lss; found_subseg: last_seg = seg; last_subseg = subseg; - last_line_subseg = ss; + last_line_subseg = lss; - return ss; + return lss; } -/* 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_subseg *lss; struct line_entry *e; + + e = (struct line_entry *) xmalloc (sizeof (*e)); + e->next = NULL; + e->label = label; + e->loc = *loc; + + lss = get_line_subseg (now_seg, now_subseg); + *lss->ptail = e; + lss->ptail = &e->next; +} + +/* Record an entry for LOC occurring at OFS within the current fragment. */ + +void +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; @@ -254,82 +319,181 @@ dwarf2_gen_line_info (ofs, loc) 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; - - ss = get_line_subseg (now_seg, now_subseg); - *ss->ptail = e; - ss->ptail = &e->next; + sym = symbol_temp_new (now_seg, ofs, frag_now); + dwarf2_gen_line_info_1 (sym, loc); } +/* Returns the current source information. If .file directives have + been encountered, the info for the corresponding source file is + returned. Otherwise, the info for the assembly source file is + returned. */ + void -dwarf2_where (line) - struct dwarf2_line_info *line; +dwarf2_where (struct dwarf2_line_info *line) { if (debug_type == DEBUG_DWARF2) { char *filename; as_where (&filename, &line->line); - line->filenum = get_filenum (filename); + line->filenum = get_filenum (filename, 0); line->column = 0; - line->flags = DWARF2_FLAG_BEGIN_STMT; + line->flags = DWARF2_FLAG_IS_STMT; + line->isa = current.isa; + line->discriminator = current.discriminator; } else *line = current; } +/* A hook to allow the target backend to inform the line number state + machine of isa changes when assembler debug info is enabled. */ + +void +dwarf2_set_isa (unsigned int isa) +{ + current.isa = isa; +} + /* Called for each machine instruction, or relatively atomic group of machine instructions (ie built-in macro). The instruction or group is SIZE bytes in length. If dwarf2 line number generation is called for, emit a line statement appropriately. */ void -dwarf2_emit_insn (size) - int size; +dwarf2_emit_insn (int size) { struct dwarf2_line_info loc; - if (loc_directive_seen) - { - /* 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; - } - else if (debug_type != DEBUG_DWARF2) + if (!dwarf2_loc_directive_seen && debug_type != DEBUG_DWARF2) return; - else - dwarf2_where (& loc); + + dwarf2_where (&loc); dwarf2_gen_line_info (frag_now_fix () - size, &loc); + dwarf2_consume_line_info (); +} + +/* Called after the current line information has been either used with + dwarf2_gen_line_info or saved with a machine instruction for later use. + This resets the state of the line number information to reflect that + it has been used. */ + +void +dwarf2_consume_line_info (void) +{ + /* Unless we generate DWARF2 debugging information for each + assembler line, we only emit one line symbol for one LOC. */ + dwarf2_loc_directive_seen = FALSE; + + current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK + | DWARF2_FLAG_PROLOGUE_END + | DWARF2_FLAG_EPILOGUE_BEGIN); + current.discriminator = 0; +} + +/* Called for each (preferably code) label. If dwarf2_loc_mark_labels + is enabled, emit a basic block marker. */ + +void +dwarf2_emit_label (symbolS *label) +{ + struct dwarf2_line_info loc; + + if (!dwarf2_loc_mark_labels) + return; + if (S_GET_SEGMENT (label) != now_seg) + return; + if (!(bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE)) + return; + if (files_in_use == 0 && debug_type != DEBUG_DWARF2) + return; + + dwarf2_where (&loc); + + loc.flags |= DWARF2_FLAG_BASIC_BLOCK; + + dwarf2_gen_line_info_1 (label, &loc); + dwarf2_consume_line_info (); } -/* Get a .debug_line file number for FILENAME. */ +/* Get a .debug_line file number for FILENAME. If NUM is nonzero, + allocate it on that file table slot, otherwise return the first + empty one. */ static unsigned int -get_filenum (filename) - const char *filename; +get_filenum (const char *filename, unsigned int num) { - static unsigned int last_used; - unsigned int i; + static unsigned int last_used, last_used_dir_len; + const char *file; + size_t dir_len; + unsigned int i, dir; - if (last_used) - if (strcmp (filename, files[last_used].filename) == 0) - return last_used; + if (num == 0 && last_used) + { + if (! files[last_used].dir + && 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) + { +#ifndef DWARF2_DIR_SHOULD_END_WITH_SEPARATOR + --dir_len; +#endif + 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] = (char *) xmalloc (dir_len + 1); + memcpy (dirs[dir], filename, dir_len); + dirs[dir][dir_len] = '\0'; + dirs_in_use = dir + 1; + } + } + + if (num == 0) + { + for (i = 1; i < files_in_use; ++i) + if (files[i].dir == dir + && files[i].filename + && strcmp (file, files[i].filename) == 0) + { + last_used = i; + last_used_dir_len = dir_len; + return i; + } + } + else + i = num; if (i >= files_allocated) { @@ -342,10 +506,12 @@ get_filenum (filename) 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; } @@ -357,8 +523,7 @@ get_filenum (filename) If an entry is added to the file table, return a pointer to the filename. */ char * -dwarf2_directive_file (dummy) - int dummy ATTRIBUTE_UNUSED; +dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED) { offsetT num; char *filename; @@ -374,6 +539,8 @@ dwarf2_directive_file (dummy) num = get_absolute_expression (); filename = demand_copy_C_string (&filename_len); + if (filename == NULL) + return NULL; demand_empty_rest_of_line (); if (num < 1) @@ -382,43 +549,34 @@ dwarf2_directive_file (dummy) return NULL; } + /* A .file directive implies compiler generated debug information is + being supplied. Turn off gas generated debug info. */ + debug_type = DEBUG_NONE; + if (num < (int) files_in_use && files[num].filename != 0) { as_bad (_("file number %ld already allocated"), (long) num); return NULL; } - if (num >= (int) files_allocated) - { - unsigned int old = files_allocated; - - files_allocated = num + 16; - files = (struct file_entry *) - xrealloc (files, (num + 16) * sizeof (struct file_entry)); - - /* Zero the new memory. */ - memset (files + old, 0, (num + 16 - old) * sizeof (struct file_entry)); - } - - files[num].filename = filename; - files[num].dir = 0; - files_in_use = num + 1; + 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) + dwarf2_emit_insn (0); filenum = get_absolute_expression (); SKIP_WHITESPACE (); line = get_absolute_expression (); - SKIP_WHITESPACE (); - column = get_absolute_expression (); - demand_empty_rest_of_line (); if (filenum < 1) { @@ -433,53 +591,150 @@ dwarf2_directive_loc (dummy) current.filenum = filenum; current.line = line; - current.column = column; - current.flags = DWARF2_FLAG_BEGIN_STMT; - - loc_directive_seen = true; + current.discriminator = 0; #ifndef NO_LISTING if (listing) { - listing_source_file (files[filenum].filename); + 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 if (strcmp (p, "discriminator") == 0) + { + *input_line_pointer = c; + value = get_absolute_expression (); + if (value >= 0) + current.discriminator = value; + else + { + as_bad (_("discriminator less than zero")); + return; + } + } + else + { + as_bad (_("unknown .loc sub-directive `%s'"), p); + *input_line_pointer = c; + return; + } + + SKIP_WHITESPACE (); + } + + demand_empty_rest_of_line (); + dwarf2_loc_directive_seen = TRUE; + debug_type = DEBUG_NONE; +} + +void +dwarf2_directive_loc_mark_labels (int dummy ATTRIBUTE_UNUSED) +{ + offsetT value = get_absolute_expression (); + + if (value != 0 && value != 1) + { + as_bad (_("expected 0 or 1")); + ignore_rest_of_line (); + } + else + { + dwarf2_loc_mark_labels = value != 0; + demand_empty_rest_of_line (); + } } 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; } /* 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); } @@ -487,8 +742,7 @@ out_byte (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); } @@ -496,8 +750,7 @@ out_opcode (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); } @@ -505,8 +758,7 @@ out_two (data) /* 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); } @@ -514,46 +766,32 @@ out_four (data) /* Emit an unsigned "little-endian base 128" number. */ static void -out_uleb128 (value) - addressT value; +out_uleb128 (addressT value) { output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); } -/* Emit a tuple for .debug_abbrev. */ - -static inline void -out_abbrev (name, form) - int name, form; -{ - out_uleb128 (name); - out_uleb128 (form); -} - -/* Create a new fake symbol whose value is the current position. */ +/* Emit a signed "little-endian base 128" number. */ -static symbolS * -symbol_new_now () +static void +out_leb128 (addressT value) { - return symbol_new (fake_label_name, now_seg, frag_now_fix (), frag_now); + output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); } -/* Set the value of SYM to the current position in the current segment. */ +/* Emit a tuple for .debug_abbrev. */ -static void -set_symbol_value_now (sym) - symbolS *sym; +static inline void +out_abbrev (int name, int form) { - S_SET_SEGMENT (sym, now_seg); - S_SET_VALUE (sym, frag_now_fix ()); - symbol_set_frag (sym, frag_now); + out_uleb128 (name); + out_uleb128 (form); } /* Get the size of a fragment. */ static offsetT -get_frag_fix (frag) - fragS *frag; +get_frag_fix (fragS *frag, segT seg) { frchainS *fr; @@ -563,13 +801,9 @@ get_frag_fix (frag) /* If a fragment is the last in the chain, special measures must be taken to find its size before relaxation, since it may be pending on some subsegment chain. */ - for (fr = frchain_root; fr; fr = fr->frch_next) + for (fr = seg_info (seg)->frchainP; fr; fr = fr->frch_next) if (fr->frch_last == frag) - { - long align_mask = -1 << get_recorded_alignment (fr->frch_seg); - return (((char *) obstack_next_free (&fr->frch_obstack) - - frag->fr_literal) + ~align_mask) & align_mask; - } + return (char *) obstack_next_free (&fr->frch_obstack) - frag->fr_literal; abort (); } @@ -577,30 +811,25 @@ get_frag_fix (frag) /* Set an absolute address (may result in a relocation entry). */ static void -out_set_addr (seg, frag, ofs) - segT seg; - fragS *frag; - addressT ofs; +out_set_addr (symbolS *sym) { - expressionS expr; - symbolS *sym; - - sym = symbol_new (fake_label_name, seg, ofs, frag); + expressionS exp; out_opcode (DW_LNS_extended_op); out_uleb128 (sizeof_address + 1); out_opcode (DW_LNE_set_address); - expr.X_op = O_symbol; - expr.X_add_symbol = sym; - expr.X_add_number = 0; - emit_expr (&expr, sizeof_address); + exp.X_op = O_symbol; + exp.X_add_symbol = sym; + exp.X_add_number = 0; + emit_expr (&exp, sizeof_address); } #if DWARF2_LINE_MIN_INSN_LENGTH > 1 +static void scale_addr_delta (addressT *); + static void -scale_addr_delta (addr_delta) - int *addr_delta; +scale_addr_delta (addressT *addr_delta) { static int printed_this = 0; if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH != 0) @@ -623,9 +852,7 @@ scale_addr_delta (addr_delta) 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; @@ -684,16 +911,16 @@ size_inc_line_addr (line_delta, addr_delta) } 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; + /* Line number sequences cannot go backward in addresses. This means + we've incorrectly ordered the statements in the sequence. */ + gas_assert ((offsetT) addr_delta >= 0); + /* Scale the address delta by the minimum instruction length. */ scale_addr_delta (&addr_delta); @@ -726,19 +953,19 @@ emit_inc_line_addr (line_delta, addr_delta, p, len) *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; @@ -773,48 +1000,143 @@ emit_inc_line_addr (line_delta, addr_delta, p, len) *p++ = tmp; done: - assert (p == end); + gas_assert (p == end); } /* Handy routine to combine calls to the above two routines. */ static void -out_inc_line_addr (line_delta, addr_delta) - int line_delta; - addressT addr_delta; +out_inc_line_addr (int line_delta, addressT addr_delta) { int len = size_inc_line_addr (line_delta, addr_delta); emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); } +/* Write out an alternative form of line and address skips using + DW_LNS_fixed_advance_pc opcodes. This uses more space than the default + line and address information, but it is required if linker relaxation + could change the code offsets. The following two routines *must* be + kept in sync. */ + +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 *pexp; + 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. */ + gas_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); + } + + pexp = 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 exp; + + gas_assert (pexp->X_op = O_subtract); + to_sym = pexp->X_add_symbol; + + *p++ = DW_LNS_extended_op; + p += output_leb128 (p, sizeof_address + 1, 0); + *p++ = DW_LNE_set_address; + exp.X_op = O_symbol; + exp.X_add_symbol = to_sym; + exp.X_add_number = 0; + subseg_change (line_seg, 0); + emit_expr_fix (&exp, sizeof_address, frag, p); + p += sizeof_address; + } + else + { + *p++ = DW_LNS_fixed_advance_pc; + subseg_change (line_seg, 0); + emit_expr_fix (pexp, 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; + + gas_assert (p == end); +} + /* Generate a variant frag that we can use to relax address/line increments between fragments of the target segment. */ static void -relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) - int line_delta; - segT seg; - fragS *to_frag, *from_frag; - addressT to_ofs, from_ofs; +relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) { - symbolS *to_sym, *from_sym; - expressionS expr; + expressionS exp; int max_chars; - to_sym = symbol_new (fake_label_name, seg, to_ofs, to_frag); - from_sym = symbol_new (fake_label_name, seg, from_ofs, from_frag); - - expr.X_op = O_subtract; - expr.X_add_symbol = to_sym; - expr.X_op_symbol = from_sym; - expr.X_add_number = 0; + exp.X_op = O_subtract; + exp.X_add_symbol = to_sym; + exp.X_op_symbol = from_sym; + exp.X_add_number = 0; /* The maximum size of the frag is the line delta with a maximum sized address delta. */ - max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); + if (DWARF2_USE_FIXED_ADVANCE_PC) + max_chars = size_fixed_inc_line_addr (line_delta, + -DWARF2_LINE_MIN_INSN_LENGTH); + else + max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH); frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, - make_expr_symbol (&expr), line_delta, NULL); + make_expr_symbol (&exp), line_delta, NULL); } /* The function estimates the size of a rs_dwarf2dbg variant frag @@ -822,14 +1144,16 @@ relax_inc_line_addr (line_delta, seg, to_frag, to_ofs, from_frag, from_ofs) the relaxation loop. We set fr_subtype to the expected length. */ int -dwarf2dbg_estimate_size_before_relax (frag) - fragS *frag; +dwarf2dbg_estimate_size_before_relax (fragS *frag) { offsetT addr_delta; int size; addr_delta = resolve_symbol_value (frag->fr_symbol); - size = size_inc_line_addr (frag->fr_offset, addr_delta); + if (DWARF2_USE_FIXED_ADVANCE_PC) + size = size_fixed_inc_line_addr (frag->fr_offset, addr_delta); + else + size = size_inc_line_addr (frag->fr_offset, addr_delta); frag->fr_subtype = size; @@ -841,8 +1165,7 @@ dwarf2dbg_estimate_size_before_relax (frag) 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; @@ -857,8 +1180,7 @@ dwarf2dbg_relax_frag (frag) 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; @@ -867,10 +1189,15 @@ dwarf2dbg_convert_frag (frag) /* fr_var carries the max_chars that we created the fragment with. fr_subtype carries the current expected length. We must, of course, have allocated enough memory earlier. */ - assert (frag->fr_var >= (int) frag->fr_subtype); + gas_assert (frag->fr_var >= (int) frag->fr_subtype); - emit_inc_line_addr (frag->fr_offset, addr_diff, - frag->fr_literal + frag->fr_fix, frag->fr_subtype); + if (DWARF2_USE_FIXED_ADVANCE_PC) + emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag, + frag->fr_literal + frag->fr_fix, + frag->fr_subtype); + else + emit_inc_line_addr (frag->fr_offset, addr_diff, + frag->fr_literal + frag->fr_fix, frag->fr_subtype); frag->fr_fix += frag->fr_subtype; frag->fr_type = rs_fill; @@ -882,30 +1209,27 @@ dwarf2dbg_convert_frag (frag) 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) @@ -913,158 +1237,196 @@ process_entries (seg, e) column = e->loc.column; out_opcode (DW_LNS_set_column); out_uleb128 (column); - changed = 1; } - if ((e->loc.flags ^ flags) & DWARF2_FLAG_BEGIN_STMT) + if (e->loc.discriminator != 0) { - flags = e->loc.flags; - out_opcode (DW_LNS_negate_stmt); - changed = 1; + out_opcode (DW_LNS_extended_op); + out_leb128 (1 + sizeof_leb128 (e->loc.discriminator, 0)); + out_opcode (DW_LNE_set_discriminator); + out_uleb128 (e->loc.discriminator); + } + + if (isa != e->loc.isa) + { + 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 (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK) + out_opcode (DW_LNS_set_basic_block); + + if (e->loc.flags & DWARF2_FLAG_PROLOGUE_END) + out_opcode (DW_LNS_set_prologue_end); + + if (e->loc.flags & DWARF2_FLAG_EPILOGUE_BEGIN) + out_opcode (DW_LNS_set_epilogue_begin); + /* Don't try to optimize away redundant entries; gdb wants two entries for a function where the code starts on the same line as the {, and there's no way to identify that case here. Trust gcc to optimize appropriately. */ - if (1 /* line != e->loc.line || changed */) - { - int line_delta = e->loc.line - line; - if (frag == NULL) - { - out_set_addr (seg, e->frag, e->frag_ofs); - out_inc_line_addr (line_delta, 0); - } - else if (frag == e->frag) - out_inc_line_addr (line_delta, e->frag_ofs - frag_ofs); - else - relax_inc_line_addr (line_delta, seg, e->frag, e->frag_ofs, - frag, frag_ofs); + line_delta = e->loc.line - line; + lab = e->label; + frag = symbol_get_frag (lab); + frag_ofs = S_GET_VALUE (lab); - frag = e->frag; - frag_ofs = e->frag_ofs; - line = e->loc.line; - } - else if (frag == NULL) + if (last_frag == NULL) { - out_set_addr (seg, e->frag, e->frag_ofs); - frag = e->frag; - frag_ofs = e->frag_ofs; + out_set_addr (lab); + out_inc_line_addr (line_delta, 0); } + else if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) + out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs); + else + relax_inc_line_addr (line_delta, lab, last_lab); + + line = e->loc.line; + last_lab = lab; + last_frag = frag; + last_frag_ofs = frag_ofs; next = e->next; free (e); e = next; } + while (e); /* Emit a DW_LNE_end_sequence for the end of the section. */ - last_frag = last_frag_for_seg (seg); - last_frag_ofs = get_frag_fix (last_frag); - if (frag == last_frag) - out_inc_line_addr (INT_MAX, last_frag_ofs - frag_ofs); + frag = last_frag_for_seg (seg); + frag_ofs = get_frag_fix (frag, seg); + if (frag == last_frag && ! DWARF2_USE_FIXED_ADVANCE_PC) + out_inc_line_addr (INT_MAX, frag_ofs - last_frag_ofs); else - relax_inc_line_addr (INT_MAX, seg, last_frag, last_frag_ofs, - frag, frag_ofs); + { + lab = symbol_temp_new (seg, frag_ofs, frag); + relax_inc_line_addr (INT_MAX, lab, last_lab); + } } /* Emit the directory and file tables for .debug_line. */ static void -out_file_list () +out_file_list (void) { size_t size; + const char *dir; char *cp; unsigned int i; - /* Terminate directory list. */ + /* Emit directory list. */ + for (i = 1; i < dirs_in_use; ++i) + { + dir = remap_debug_filename (dirs[i]); + size = strlen (dir) + 1; + cp = frag_more (size); + memcpy (cp, dir, size); + } + /* Terminate it. */ out_byte ('\0'); for (i = 1; i < files_in_use; ++i) { + const char *fullfilename; + if (files[i].filename == NULL) { as_bad (_("unassigned file number %ld"), (long) i); + /* Prevent a crash later, particularly for file 1. */ + files[i].filename = ""; continue; } - size = strlen (files[i].filename) + 1; + fullfilename = DWARF2_FILE_NAME (files[i].filename, + files[i].dir ? dirs [files [i].dir] : ""); + size = strlen (fullfilename) + 1; cp = frag_more (size); - memcpy (cp, files[i].filename, size); + memcpy (cp, fullfilename, size); out_uleb128 (files[i].dir); /* directory number */ - out_uleb128 (0); /* last modification timestamp */ - out_uleb128 (0); /* filesize */ + /* Output the last modification timestamp. */ + out_uleb128 (DWARF2_FILE_TIME_NAME (files[i].filename, + files[i].dir ? dirs [files [i].dir] : "")); + /* Output the filesize. */ + out_uleb128 (DWARF2_FILE_SIZE_NAME (files[i].filename, + files[i].dir ? dirs [files [i].dir] : "")); } /* Terminate filename list. */ out_byte (0); } +/* Switch to SEC and output a header length field. Return the size of + offsets used in SEC. The caller must set EXPR->X_add_symbol value + to the end of the section. */ + +static int +out_header (asection *sec, expressionS *exp) +{ + symbolS *start_sym; + symbolS *end_sym; + + subseg_set (sec, 0); + start_sym = symbol_temp_new_now ();; + end_sym = symbol_temp_make (); + + /* Total length of the information. */ + exp->X_op = O_subtract; + exp->X_add_symbol = end_sym; + exp->X_op_symbol = start_sym; + + switch (DWARF2_FORMAT (sec)) + { + case dwarf2_format_32bit: + exp->X_add_number = -4; + emit_expr (exp, 4); + return 4; + + case dwarf2_format_64bit: + exp->X_add_number = -12; + out_four (-1); + emit_expr (exp, 8); + return 8; + + case dwarf2_format_64bit_irix: + exp->X_add_number = -8; + emit_expr (exp, 8); + return 8; + } + + as_fatal (_("internal error: unknown dwarf2 format")); + return 0; +} + /* Emit the collected .debug_line data. */ static void -out_debug_line (line_seg) - segT line_seg; +out_debug_line (segT line_seg) { - expressionS expr; - symbolS *line_start; + expressionS exp; 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")); - } + sizeof_offset = out_header (line_seg, &exp); + line_end = exp.X_add_symbol; /* 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); + prologue_end = symbol_temp_make (); + exp.X_add_symbol = prologue_end; + exp.X_add_number = - (4 + 2 + 4); + emit_expr (&exp, sizeof_offset); /* Parameters of the state machine. */ out_byte (DWARF2_LINE_MIN_INSN_LENGTH); @@ -1083,56 +1445,89 @@ out_debug_line (line_seg) out_byte (0); /* DW_LNS_set_basic_block */ out_byte (0); /* DW_LNS_const_add_pc */ out_byte (1); /* DW_LNS_fixed_advance_pc */ + out_byte (0); /* DW_LNS_set_prologue_end */ + out_byte (0); /* DW_LNS_set_epilogue_begin */ + out_byte (1); /* DW_LNS_set_isa */ out_file_list (); - set_symbol_value_now (prologue_end); + symbol_set_value_now (prologue_end); /* For each section, emit a statement program. */ for (s = all_segs; s; s = s->next) process_entries (s->seg, s->head->head); - set_symbol_value_now (line_end); + symbol_set_value_now (line_end); } -/* Emit data for .debug_aranges. */ - static void -out_debug_aranges (aranges_seg, info_seg) - segT aranges_seg; - segT info_seg; +out_debug_ranges (segT ranges_seg) { unsigned int addr_size = sizeof_address; - addressT size, skip; struct line_seg *s; - expressionS expr; - char *p; + expressionS exp; + unsigned int i; - size = 4 + 2 + 4 + 1 + 1; + subseg_set (ranges_seg, 0); - skip = 2 * addr_size - (size & (2 * addr_size - 1)); - if (skip == 2 * addr_size) - skip = 0; - size += skip; + /* Base Address Entry. */ + for (i = 0; i < addr_size; i++) + out_byte (0xff); + for (i = 0; i < addr_size; i++) + out_byte (0); + /* Range List Entry. */ for (s = all_segs; s; s = s->next) - size += 2 * addr_size; + { + fragS *frag; + symbolS *beg, *end; + + frag = first_frag_for_seg (s->seg); + beg = symbol_temp_new (s->seg, 0, frag); + s->text_start = beg; - size += 2 * addr_size; + frag = last_frag_for_seg (s->seg); + end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); + s->text_end = end; + + exp.X_op = O_symbol; + exp.X_add_symbol = beg; + exp.X_add_number = 0; + emit_expr (&exp, addr_size); + + exp.X_op = O_symbol; + exp.X_add_symbol = end; + exp.X_add_number = 0; + emit_expr (&exp, addr_size); + } + + /* End of Range Entry. */ + for (i = 0; i < addr_size; i++) + out_byte (0); + for (i = 0; i < addr_size; i++) + out_byte (0); +} + +/* Emit data for .debug_aranges. */ - subseg_set (aranges_seg, 0); +static void +out_debug_aranges (segT aranges_seg, segT info_seg) +{ + unsigned int addr_size = sizeof_address; + struct line_seg *s; + expressionS exp; + symbolS *aranges_end; + char *p; + int sizeof_offset; - /* Length of the compilation unit. */ - out_four (size - 4); + sizeof_offset = out_header (aranges_seg, &exp); + aranges_end = exp.X_add_symbol; /* 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); + TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), sizeof_offset); /* Size of an address (offset portion). */ out_byte (addr_size); @@ -1141,8 +1536,7 @@ out_debug_aranges (aranges_seg, info_seg) out_byte (0); /* 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) { @@ -1150,48 +1544,61 @@ out_debug_aranges (aranges_seg, info_seg) symbolS *beg, *end; frag = first_frag_for_seg (s->seg); - beg = symbol_new (fake_label_name, s->seg, 0, frag); + beg = symbol_temp_new (s->seg, 0, frag); s->text_start = beg; frag = last_frag_for_seg (s->seg); - end = symbol_new (fake_label_name, s->seg, get_frag_fix (frag), frag); + end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); s->text_end = end; - expr.X_op = O_symbol; - expr.X_add_symbol = beg; - expr.X_add_number = 0; - emit_expr (&expr, addr_size); + exp.X_op = O_symbol; + exp.X_add_symbol = beg; + exp.X_add_number = 0; + emit_expr (&exp, addr_size); - expr.X_op = O_subtract; - expr.X_add_symbol = end; - expr.X_op_symbol = beg; - expr.X_add_number = 0; - emit_expr (&expr, addr_size); + exp.X_op = O_subtract; + exp.X_add_symbol = end; + exp.X_op_symbol = beg; + exp.X_add_number = 0; + emit_expr (&exp, addr_size); } p = frag_more (2 * addr_size); md_number_to_chars (p, 0, addr_size); md_number_to_chars (p + addr_size, 0, addr_size); + + symbol_set_value_now (aranges_end); } /* Emit data for .debug_abbrev. Note that this must be kept in sync with out_debug_info below. */ static void -out_debug_abbrev (abbrev_seg) - segT abbrev_seg; +out_debug_abbrev (segT abbrev_seg, + segT info_seg ATTRIBUTE_UNUSED, + segT line_seg ATTRIBUTE_UNUSED) { subseg_set (abbrev_seg, 0); out_uleb128 (1); out_uleb128 (DW_TAG_compile_unit); out_byte (DW_CHILDREN_no); - out_abbrev (DW_AT_stmt_list, DW_FORM_data4); + if (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit) + out_abbrev (DW_AT_stmt_list, DW_FORM_data4); + else + out_abbrev (DW_AT_stmt_list, DW_FORM_data8); if (all_segs->next == NULL) { out_abbrev (DW_AT_low_pc, DW_FORM_addr); out_abbrev (DW_AT_high_pc, DW_FORM_addr); } + else + { + if (DWARF2_FORMAT (info_seg) == dwarf2_format_32bit) + out_abbrev (DW_AT_ranges, DW_FORM_data4); + else + out_abbrev (DW_AT_ranges, DW_FORM_data8); + } out_abbrev (DW_AT_name, DW_FORM_string); out_abbrev (DW_AT_comp_dir, DW_FORM_string); out_abbrev (DW_AT_producer, DW_FORM_string); @@ -1205,64 +1612,25 @@ out_debug_abbrev (abbrev_seg) /* Emit a description of this compilation unit for .debug_info. */ static void -out_debug_info (info_seg, abbrev_seg, line_seg) - segT info_seg; - segT abbrev_seg; - segT line_seg; +out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg) { char producer[128]; - char *comp_dir; - expressionS expr; - symbolS *info_start; + const char *comp_dir; + const char *dirname; + expressionS exp; symbolS *info_end; char *p; int len; - enum dwarf2_format d2f; int sizeof_offset; - subseg_set (info_seg, 0); - - info_start = symbol_new_now (); - info_end = symbol_make (fake_label_name); - - /* Compilation Unit length. */ - expr.X_op = O_subtract; - expr.X_add_symbol = info_end; - expr.X_op_symbol = info_start; - - 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")); - } + sizeof_offset = out_header (info_seg, &exp); + info_end = exp.X_add_symbol; /* 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, sizeof_offset); + TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset); /* Target address size. */ out_byte (sizeof_address); @@ -1271,40 +1639,58 @@ out_debug_info (info_seg, abbrev_seg, line_seg) out_uleb128 (1); /* DW_AT_stmt_list */ - expr.X_op = O_symbol; - expr.X_add_symbol = section_symbol (line_seg); - expr.X_add_number = 0; - emit_expr (&expr, 4); + TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), + (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit + ? 4 : 8)); - /* These two attributes may only be emitted if all of the code is - contiguous. Multiple sections are not that. */ + /* These two attributes are emitted if all of the code is contiguous. */ if (all_segs->next == NULL) { /* DW_AT_low_pc */ - expr.X_op = O_symbol; - expr.X_add_symbol = all_segs->text_start; - expr.X_add_number = 0; - emit_expr (&expr, sizeof_address); + exp.X_op = O_symbol; + exp.X_add_symbol = all_segs->text_start; + exp.X_add_number = 0; + emit_expr (&exp, sizeof_address); /* DW_AT_high_pc */ - expr.X_op = O_symbol; - expr.X_add_symbol = all_segs->text_end; - expr.X_add_number = 0; - emit_expr (&expr, sizeof_address); + exp.X_op = O_symbol; + exp.X_add_symbol = all_segs->text_end; + exp.X_add_number = 0; + emit_expr (&exp, sizeof_address); + } + else + { + /* This attribute is emitted if the code is disjoint. */ + /* DW_AT_ranges. */ + TC_DWARF2_EMIT_OFFSET (section_symbol (ranges_seg), sizeof_offset); } /* DW_AT_name. We don't have the actual file name that was present on the command line, so assume files[1] is the main input file. We're not supposed to get called unless at least one line number entry was emitted, so this should always be defined. */ - if (!files || files_in_use < 1) + if (files_in_use == 0) abort (); + if (files[1].dir) + { + dirname = remap_debug_filename (dirs[files[1].dir]); + len = strlen (dirname); +#ifdef TE_VMS + /* Already has trailing slash. */ + p = frag_more (len); + memcpy (p, dirname, len); +#else + p = frag_more (len + 1); + memcpy (p, dirname, len); + INSERT_DIR_SEPARATOR (p, len); +#endif + } len = strlen (files[1].filename) + 1; p = frag_more (len); memcpy (p, files[1].filename, len); /* DW_AT_comp_dir */ - comp_dir = getpwd (); + comp_dir = remap_debug_filename (getpwd ()); len = strlen (comp_dir) + 1; p = frag_more (len); memcpy (p, comp_dir, len); @@ -1319,119 +1705,112 @@ out_debug_info (info_seg, abbrev_seg, line_seg) dwarf2 draft has no standard code for assembler. */ out_two (DW_LANG_Mips_Assembler); - set_symbol_value_now (info_end); + symbol_set_value_now (info_end); +} + +void +dwarf2_init (void) +{ + all_segs_hash = hash_new (); + last_seg_ptr = &all_segs; } + +/* Finish the dwarf2 debug sections. We emit .debug.line if there + were any .file/.loc directives, or --gdwarf2 was given, or if the + file has a non-empty .debug_info section and an empty .debug_line + section. If we emit .debug_line, and the .debug_info section is + empty, we also emit .debug_info, .debug_aranges and .debug_abbrev. + ALL_SEGS will be non-null if there were any .file/.loc directives, + or --gdwarf2 was given and there were any located instructions + emitted. */ + void -dwarf2_finish () +dwarf2_finish (void) { segT line_seg; struct line_seg *s; - - /* 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) + segT info_seg; + int emit_other_sections = 0; + int empty_debug_line = 0; + + info_seg = bfd_get_section_by_name (stdoutput, ".debug_info"); + emit_other_sections = info_seg == NULL || !seg_not_empty_p (info_seg); + + line_seg = bfd_get_section_by_name (stdoutput, ".debug_line"); + empty_debug_line = line_seg == NULL || !seg_not_empty_p (line_seg); + + /* We can't construct a new debug_line section if we already have one. + Give an error. */ + if (all_segs && !empty_debug_line) + as_fatal ("duplicate .debug_line sections"); + + if ((!all_segs && emit_other_sections) + || (!emit_other_sections && !empty_debug_line)) + /* If there is no line information and no non-empty .debug_info + section, or if there is both a non-empty .debug_info and a non-empty + .debug_line, then we do nothing. */ return; /* Calculate the size of an address for the target machine. */ - sizeof_address = bfd_arch_bits_per_address (stdoutput) / 8; + sizeof_address = DWARF2_ADDR_SIZE (stdoutput); /* Create and switch to the line number section. */ line_seg = subseg_new (".debug_line", 0); - bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY); + bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY | SEC_DEBUGGING); /* For each subsection, chain the debug entries together. */ for (s = all_segs; s; s = s->next) { - struct line_subseg *ss = s->head; - struct line_entry **ptail = ss->ptail; + struct line_subseg *lss = s->head; + struct line_entry **ptail = lss->ptail; - while ((ss = ss->next) != NULL) + while ((lss = lss->next) != NULL) { - *ptail = ss->head; - ptail = ss->ptail; + *ptail = lss->head; + ptail = lss->ptail; } } out_debug_line (line_seg); - /* If this is assembler generated line info, we need .debug_info - and .debug_abbrev sections as well. */ - if (all_segs != NULL && debug_type == DEBUG_DWARF2) + /* If this is assembler generated line info, and there is no + debug_info already, we need .debug_info and .debug_abbrev + sections as well. */ + if (emit_other_sections) { segT abbrev_seg; - segT info_seg; segT aranges_seg; + segT ranges_seg; + + gas_assert (all_segs); info_seg = subseg_new (".debug_info", 0); abbrev_seg = subseg_new (".debug_abbrev", 0); aranges_seg = subseg_new (".debug_aranges", 0); - bfd_set_section_flags (stdoutput, info_seg, SEC_READONLY); - bfd_set_section_flags (stdoutput, abbrev_seg, SEC_READONLY); - bfd_set_section_flags (stdoutput, aranges_seg, SEC_READONLY); + bfd_set_section_flags (stdoutput, info_seg, + SEC_READONLY | SEC_DEBUGGING); + bfd_set_section_flags (stdoutput, abbrev_seg, + SEC_READONLY | SEC_DEBUGGING); + bfd_set_section_flags (stdoutput, aranges_seg, + SEC_READONLY | SEC_DEBUGGING); record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); + if (all_segs->next == NULL) + ranges_seg = NULL; + else + { + ranges_seg = subseg_new (".debug_ranges", 0); + bfd_set_section_flags (stdoutput, ranges_seg, + SEC_READONLY | SEC_DEBUGGING); + record_alignment (ranges_seg, ffs (2 * sizeof_address) - 1); + out_debug_ranges (ranges_seg); + } + out_debug_aranges (aranges_seg, info_seg); - out_debug_abbrev (abbrev_seg); - out_debug_info (info_seg, abbrev_seg, line_seg); + out_debug_abbrev (abbrev_seg, info_seg, line_seg); + out_debug_info (info_seg, abbrev_seg, line_seg, ranges_seg); } } - -#else -void -dwarf2_finish () -{ -} - -int -dwarf2dbg_estimate_size_before_relax (frag) - fragS *frag ATTRIBUTE_UNUSED; -{ - as_fatal (_("dwarf2 is not supported for this object file format")); - return 0; -} - -int -dwarf2dbg_relax_frag (frag) - fragS *frag ATTRIBUTE_UNUSED; -{ - as_fatal (_("dwarf2 is not supported for this object file format")); - return 0; -} - -void -dwarf2dbg_convert_frag (frag) - fragS *frag ATTRIBUTE_UNUSED; -{ - as_fatal (_("dwarf2 is not supported for this object file format")); -} - -void -dwarf2_emit_insn (size) - int size ATTRIBUTE_UNUSED; -{ -} - -char * -dwarf2_directive_file (dummy) - int dummy ATTRIBUTE_UNUSED; -{ - s_app_file (0); - return NULL; -} - -void -dwarf2_directive_loc (dummy) - int dummy ATTRIBUTE_UNUSED; -{ - as_fatal (_("dwarf2 is not supported for this object file format")); -} -#endif /* BFD_ASSEMBLER */