X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gas%2Fdwarf2dbg.c;h=76f5e84f53fa903547e08504fab5682a8fa3450c;hb=9e8da49c0182de1ca0d5feb14241daefc920c92b;hp=615d64431f9c7fb01272e683c9423cdaa02577da;hpb=7ddd14deffa8d2579c691bb8f19585fb2e7b5de3;p=deliverable%2Fbinutils-gdb.git diff --git a/gas/dwarf2dbg.c b/gas/dwarf2dbg.c index 615d64431f..76f5e84f53 100644 --- a/gas/dwarf2dbg.c +++ b/gas/dwarf2dbg.c @@ -1,5 +1,5 @@ /* dwarf2dbg.c - DWARF2 debug support - Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 + Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. Contributed by David Mosberger-Tang @@ -25,7 +25,8 @@ .file FILENO "file.c" .loc FILENO LINENO [COLUMN] [basic_block] [prologue_end] \ - [epilogue_begin] [is_stmt VALUE] [isa VALUE] + [epilogue_begin] [is_stmt VALUE] [isa VALUE] \ + [discriminator VALUE] */ #include "as.h" @@ -57,8 +58,8 @@ do \ { \ if (offset > 1 \ - && string[0] != 0 \ - && string[1] == ':') \ + && string[0] != 0 \ + && string[1] == ':') \ string [offset] = '\\'; \ else \ string [offset] = '/'; \ @@ -69,16 +70,32 @@ #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 + +#ifndef DWARF2_FILE_SIZE_NAME +#define DWARF2_FILE_SIZE_NAME(FILENAME,DIRNAME) 0 +#endif + +#ifndef DWARF2_VERSION +#define DWARF2_VERSION 2 +#endif + #include "subsegs.h" -#include "elf/dwarf2.h" +#include "dwarf2.h" /* Since we can't generate the prolog until the body is complete, we use three different subsegments for .debug_line: one holding the @@ -155,6 +172,10 @@ 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 { const char *filename; @@ -182,36 +203,19 @@ bfd_boolean dwarf2_loc_mark_labels; /* 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 + DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, + 0 }; +/* Lines that are at the same location as CURRENT, and which are waiting + for a label. */ +static struct line_entry *pending_lines, **pending_lines_tail = &pending_lines; + /* The size of an address on the target. */ static unsigned int sizeof_address; -static struct line_subseg *get_line_subseg (segT, subsegT); static unsigned int get_filenum (const char *, unsigned int); -static struct frag *first_frag_for_seg (segT); -static struct frag *last_frag_for_seg (segT); -static void out_byte (int); -static void out_opcode (int); -static void out_two (int); -static void out_four (int); -static void out_abbrev (int, int); -static void out_uleb128 (addressT); -static offsetT get_frag_fix (fragS *, segT); -static void out_set_addr (symbolS *); -static int size_inc_line_addr (int, addressT); -static void emit_inc_line_addr (int, addressT, char *, int); -static int size_fixed_inc_line_addr (int, addressT); -static void emit_fixed_inc_line_addr (int, addressT, fragS *, char *, int); -static void out_inc_line_addr (int, addressT); -static void relax_inc_line_addr (int, symbolS *, symbolS *); -static void process_entries (segT, struct line_entry *); -static void out_file_list (void); -static void out_debug_line (segT); -static void out_debug_aranges (segT, segT); -static void out_debug_abbrev (segT); - + #ifndef TC_DWARF2_EMIT_OFFSET #define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset @@ -220,12 +224,12 @@ static void out_debug_abbrev (segT); static void generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) { - expressionS expr; + expressionS exp; - expr.X_op = O_symbol; - expr.X_add_symbol = symbol; - expr.X_add_number = 0; - emit_expr (&expr, size); + exp.X_op = O_symbol; + exp.X_add_symbol = symbol; + exp.X_add_number = 0; + emit_expr (&exp, size); } #endif @@ -238,62 +242,89 @@ get_line_subseg (segT seg, subsegT subseg) static subsegT last_subseg; static struct line_subseg *last_line_subseg; - struct line_seg **ps, *s; - struct line_subseg **pss, *ss; + struct line_seg *s; + struct line_subseg **pss, *lss; if (seg == last_seg && subseg == last_subseg) return last_line_subseg; - for (ps = &all_segs; (s = *ps) != NULL; ps = &s->next) - if (s->seg == seg) - goto found_seg; - - s = (struct line_seg *) xmalloc (sizeof (*s)); - s->next = NULL; - s->seg = seg; - s->head = NULL; - *ps = 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 occurring at LABEL. */ +/* Push LOC onto the pending lines list. */ static void -dwarf2_gen_line_info_1 (symbolS *label, struct dwarf2_line_info *loc) +dwarf2_push_line (struct dwarf2_line_info *loc) { - struct line_subseg *ss; struct line_entry *e; e = (struct line_entry *) xmalloc (sizeof (*e)); e->next = NULL; - e->label = label; + e->label = NULL; e->loc = *loc; - ss = get_line_subseg (now_seg, now_subseg); - *ss->ptail = e; - ss->ptail = &e->next; + *pending_lines_tail = e; + pending_lines_tail = &(*pending_lines_tail)->next; +} + +/* Emit all pending line information. LABEL is the label with which the + lines should be associated, or null if they should be associated with + the current position. */ + +static void +dwarf2_flush_pending_lines (symbolS *label) +{ + if (pending_lines) + { + struct line_subseg *lss; + struct line_entry *e; + + if (!label) + label = symbol_temp_new_now (); + + for (e = pending_lines; e; e = e->next) + e->label = label; + + lss = get_line_subseg (now_seg, now_subseg); + *lss->ptail = pending_lines; + lss->ptail = pending_lines_tail; + + pending_lines = NULL; + pending_lines_tail = &pending_lines; + } } /* Record an entry for LOC occurring at OFS within the current fragment. */ @@ -304,8 +335,6 @@ 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; @@ -321,8 +350,8 @@ dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc) line = loc->line; filenum = loc->filenum; - sym = symbol_temp_new (now_seg, ofs, frag_now); - dwarf2_gen_line_info_1 (sym, loc); + dwarf2_push_line (loc); + dwarf2_flush_pending_lines (symbol_temp_new (now_seg, ofs, frag_now)); } /* Returns the current source information. If .file directives have @@ -341,12 +370,13 @@ dwarf2_where (struct dwarf2_line_info *line) line->column = 0; 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 +/* A hook to allow the target backend to inform the line number state machine of isa changes when assembler debug info is enabled. */ void @@ -365,19 +395,10 @@ dwarf2_emit_insn (int size) { struct dwarf2_line_info loc; - if (dwarf2_loc_directive_seen) - { - /* Use the last location established by a .loc directive, not - the value returned by dwarf2_where(). That calls as_where() - which will return either the logical input file name (foo.c) - or the physical input file name (foo.s) and not the file name - specified in the most recent .loc directive (eg foo.h). */ - loc = current; - } - else if (debug_type != DEBUG_DWARF2) + 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 (); @@ -391,14 +412,19 @@ dwarf2_emit_insn (int size) void dwarf2_consume_line_info (void) { + /* If the consumer has stashed the current location away for later use, + assume that any earlier location information should be associated + with ".". */ + dwarf2_flush_pending_lines (NULL); + /* Unless we generate DWARF2 debugging information for each assembler line, we only emit one line symbol for one LOC. */ - if (debug_type != DEBUG_DWARF2) - dwarf2_loc_directive_seen = FALSE; + 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 @@ -415,16 +441,16 @@ dwarf2_emit_label (symbolS *label) return; if (!(bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE)) return; - - if (debug_type == DEBUG_DWARF2) - dwarf2_where (&loc); - else - loc = current; + if (files_in_use == 0 && debug_type != DEBUG_DWARF2) + return; + + dwarf2_where (&loc); loc.flags |= DWARF2_FLAG_BASIC_BLOCK; + dwarf2_push_line (&loc); + dwarf2_flush_pending_lines (label); dwarf2_consume_line_info (); - dwarf2_gen_line_info_1 (label, &loc); } /* Get a .debug_line file number for FILENAME. If NUM is nonzero, @@ -442,14 +468,14 @@ get_filenum (const char *filename, unsigned int num) if (num == 0 && last_used) { if (! files[last_used].dir - && strcmp (filename, files[last_used].filename) == 0) + && filename_cmp (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 + && filename_ncmp (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) + && filename_cmp (filename + last_used_dir_len + 1, + files[last_used].filename) == 0) return last_used; } @@ -467,9 +493,11 @@ get_filenum (const char *filename, unsigned int num) 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 + if (filename_ncmp (filename, dirs[dir], dir_len) == 0 && dirs[dir][dir_len] == '\0') break; @@ -482,7 +510,7 @@ get_filenum (const char *filename, unsigned int num) xrealloc (dirs, (dir + 32) * sizeof (const char *)); } - dirs[dir] = xmalloc (dir_len + 1); + dirs[dir] = (char *) xmalloc (dir_len + 1); memcpy (dirs[dir], filename, dir_len); dirs[dir][dir_len] = '\0'; dirs_in_use = dir + 1; @@ -494,7 +522,7 @@ get_filenum (const char *filename, unsigned int num) for (i = 1; i < files_in_use; ++i) if (files[i].dir == dir && files[i].filename - && strcmp (file, files[i].filename) == 0) + && filename_cmp (file, files[i].filename) == 0) { last_used = i; last_used_dir_len = dir_len; @@ -558,6 +586,10 @@ dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED) 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); @@ -576,8 +608,8 @@ dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) /* If we see two .loc directives in a row, force the first one to be output now. */ - if (dwarf2_loc_directive_seen && debug_type != DEBUG_DWARF2) - dwarf2_emit_insn (0); + if (dwarf2_loc_directive_seen) + dwarf2_push_line (¤t); filenum = get_absolute_expression (); SKIP_WHITESPACE (); @@ -596,6 +628,7 @@ dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) current.filenum = filenum; current.line = line; + current.discriminator = 0; #ifndef NO_LISTING if (listing) @@ -664,7 +697,7 @@ dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) } else if (strcmp (p, "isa") == 0) { - *input_line_pointer = c; + *input_line_pointer = c; value = get_absolute_expression (); if (value >= 0) current.isa = value; @@ -674,10 +707,22 @@ dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) 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; + *input_line_pointer = c; return; } @@ -686,6 +731,7 @@ dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED) demand_empty_rest_of_line (); dwarf2_loc_directive_seen = TRUE; + debug_type = DEBUG_NONE; } void @@ -762,6 +808,14 @@ out_uleb128 (addressT value) output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); } +/* Emit a signed "little-endian base 128" number. */ + +static void +out_leb128 (addressT value) +{ + output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1); +} + /* Emit a tuple for .debug_abbrev. */ static inline void @@ -796,16 +850,16 @@ get_frag_fix (fragS *frag, segT seg) static void out_set_addr (symbolS *sym) { - expressionS expr; + 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 @@ -902,7 +956,7 @@ emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) /* Line number sequences cannot go backward in addresses. This means we've incorrectly ordered the statements in the sequence. */ - assert ((offsetT) addr_delta >= 0); + gas_assert ((offsetT) addr_delta >= 0); /* Scale the address delta by the minimum instruction length. */ scale_addr_delta (&addr_delta); @@ -983,7 +1037,7 @@ emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) *p++ = tmp; done: - assert (p == end); + gas_assert (p == end); } /* Handy routine to combine calls to the above two routines. */ @@ -1035,13 +1089,13 @@ static void emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, char *p, int len) { - expressionS *exp; + 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. */ - assert ((offsetT) addr_delta >= 0); + 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) @@ -1050,7 +1104,7 @@ emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, p += output_leb128 (p, line_delta, 1); } - exp = symbol_get_value_expression (frag->fr_symbol); + 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 @@ -1061,26 +1115,26 @@ emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, if (addr_delta > 50000) { symbolS *to_sym; - expressionS expr; + expressionS exp; - assert (exp->X_op = O_subtract); - to_sym = exp->X_add_symbol; + 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; - expr.X_op = O_symbol; - expr.X_add_symbol = to_sym; - expr.X_add_number = 0; + exp.X_op = O_symbol; + exp.X_add_symbol = to_sym; + exp.X_add_number = 0; subseg_change (line_seg, 0); - emit_expr_fix (&expr, sizeof_address, frag, p); + 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 (exp, 2, frag, p); + emit_expr_fix (pexp, 2, frag, p); p += 2; } @@ -1093,7 +1147,7 @@ emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, else *p++ = DW_LNS_copy; - assert (p == end); + gas_assert (p == end); } /* Generate a variant frag that we can use to relax address/line @@ -1102,13 +1156,13 @@ emit_fixed_inc_line_addr (int line_delta, addressT addr_delta, fragS *frag, static void relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) { - expressionS expr; + expressionS exp; int max_chars; - 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. */ @@ -1119,7 +1173,7 @@ relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) 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 @@ -1172,7 +1226,7 @@ dwarf2dbg_convert_frag (fragS *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); if (DWARF2_USE_FIXED_ADVANCE_PC) emit_fixed_inc_line_addr (frag->fr_offset, addr_diff, frag, @@ -1222,6 +1276,14 @@ process_entries (segT seg, struct line_entry *e) out_uleb128 (column); } + if (e->loc.discriminator != 0) + { + 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; @@ -1309,6 +1371,8 @@ out_file_list (void) for (i = 1; i < files_in_use; ++i) { + const char *fullfilename; + if (files[i].filename == NULL) { as_bad (_("unassigned file number %ld"), (long) i); @@ -1317,77 +1381,89 @@ out_file_list (void) 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 (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_temp_new_now (); - prologue_end = symbol_temp_make (); - line_end = symbol_temp_make (); - - /* Total length of the information for this compilation unit. */ - expr.X_op = O_subtract; - expr.X_add_symbol = line_end; - expr.X_op_symbol = line_start; - - 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); + out_two (DWARF2_VERSION); /* Length of the prologue following this length. */ - expr.X_op = O_subtract; - expr.X_add_symbol = prologue_end; - expr.X_op_symbol = line_start; - expr.X_add_number = - (4 + 2 + 4); - emit_expr (&expr, 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); @@ -1416,7 +1492,11 @@ out_debug_line (segT line_seg) /* For each section, emit a statement program. */ for (s = all_segs; s; s = s->next) - process_entries (s->seg, s->head->head); + if (SEG_NORMAL (s->seg)) + process_entries (s->seg, s->head->head); + else + as_warn ("dwarf line number information for %s ignored", + segment_name (s->seg)); symbol_set_value_now (line_end); } @@ -1426,15 +1506,15 @@ out_debug_ranges (segT ranges_seg) { unsigned int addr_size = sizeof_address; struct line_seg *s; - expressionS expr; + expressionS exp; unsigned int i; subseg_set (ranges_seg, 0); /* Base Address Entry. */ - for (i = 0; i < addr_size; i++) + for (i = 0; i < addr_size; i++) out_byte (0xff); - for (i = 0; i < addr_size; i++) + for (i = 0; i < addr_size; i++) out_byte (0); /* Range List Entry. */ @@ -1451,21 +1531,21 @@ out_debug_ranges (segT ranges_seg) end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); s->text_end = end; - expr.X_op = O_symbol; - expr.X_add_symbol = beg; - expr.X_add_number = 0; - emit_expr (&expr, addr_size); + exp.X_op = O_symbol; + exp.X_add_symbol = beg; + exp.X_add_number = 0; + emit_expr (&exp, addr_size); - expr.X_op = O_symbol; - expr.X_add_symbol = end; - expr.X_add_number = 0; - emit_expr (&expr, 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++) + for (i = 0; i < addr_size; i++) out_byte (0); - for (i = 0; i < addr_size; i++) + for (i = 0; i < addr_size; i++) out_byte (0); } @@ -1475,34 +1555,20 @@ static void out_debug_aranges (segT aranges_seg, segT info_seg) { unsigned int addr_size = sizeof_address; - addressT size, skip; struct line_seg *s; - expressionS expr; + expressionS exp; + symbolS *aranges_end; char *p; + int sizeof_offset; - size = 4 + 2 + 4 + 1 + 1; - - skip = 2 * addr_size - (size & (2 * addr_size - 1)); - if (skip == 2 * addr_size) - skip = 0; - size += skip; - - for (s = all_segs; s; s = s->next) - size += 2 * addr_size; - - size += 2 * addr_size; - - subseg_set (aranges_seg, 0); - - /* Length of the compilation unit. */ - out_four (size - 4); + sizeof_offset = out_header (aranges_seg, &exp); + aranges_end = exp.X_add_symbol; /* Version. */ - out_two (2); + out_two (DWARF2_VERSION); /* Offset to .debug_info. */ - /* ??? sizeof_offset */ - TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), 4); + TC_DWARF2_EMIT_OFFSET (section_symbol (info_seg), sizeof_offset); /* Size of an address (offset portion). */ out_byte (addr_size); @@ -1511,8 +1577,7 @@ out_debug_aranges (segT aranges_seg, segT 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) { @@ -1527,35 +1592,42 @@ out_debug_aranges (segT aranges_seg, segT info_seg) end = symbol_temp_new (s->seg, get_frag_fix (frag, s->seg), frag); s->text_end = end; - expr.X_op = O_symbol; - expr.X_add_symbol = beg; - expr.X_add_number = 0; - emit_expr (&expr, addr_size); + 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 (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); @@ -1563,7 +1635,7 @@ out_debug_abbrev (segT abbrev_seg) } else { - if (DWARF2_FORMAT () == dwarf2_format_32bit) + 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); @@ -1586,51 +1658,17 @@ out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg) char producer[128]; const char *comp_dir; const char *dirname; - expressionS expr; - symbolS *info_start; + expressionS exp; symbolS *info_end; char *p; int len; - enum dwarf2_format d2f; int sizeof_offset; - subseg_set (info_seg, 0); - - info_start = symbol_temp_new_now (); - info_end = symbol_temp_make (); - - /* Compilation Unit length. */ - expr.X_op = O_subtract; - expr.X_add_symbol = info_end; - expr.X_op_symbol = info_start; - - 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); + out_two (DWARF2_VERSION); /* .debug_abbrev offset */ TC_DWARF2_EMIT_OFFSET (section_symbol (abbrev_seg), sizeof_offset); @@ -1642,23 +1680,24 @@ out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg) out_uleb128 (1); /* DW_AT_stmt_list */ - /* ??? sizeof_offset */ - TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), 4); + TC_DWARF2_EMIT_OFFSET (section_symbol (line_seg), + (DWARF2_FORMAT (line_seg) == dwarf2_format_32bit + ? 4 : 8)); /* 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 { @@ -1671,15 +1710,21 @@ out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg) 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); @@ -1704,13 +1749,22 @@ out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg, segT ranges_seg) 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. 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. */ + 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 (void) @@ -1719,13 +1773,24 @@ dwarf2_finish (void) struct line_seg *s; 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); - if (!all_segs && emit_other_sections) - /* There is no line information and no non-empty .debug_info - section. */ + 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. */ @@ -1738,13 +1803,13 @@ dwarf2_finish (void) /* 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; } } @@ -1759,8 +1824,8 @@ dwarf2_finish (void) segT aranges_seg; segT ranges_seg; - assert (all_segs); - + 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); @@ -1779,14 +1844,14 @@ dwarf2_finish (void) else { ranges_seg = subseg_new (".debug_ranges", 0); - bfd_set_section_flags (stdoutput, ranges_seg, + 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_abbrev (abbrev_seg, info_seg, line_seg); out_debug_info (info_seg, abbrev_seg, line_seg, ranges_seg); } }