diff options
Diffstat (limited to 'gdb/dstread.c')
| -rw-r--r-- | gdb/dstread.c | 1665 |
1 files changed, 1665 insertions, 0 deletions
diff --git a/gdb/dstread.c b/gdb/dstread.c new file mode 100644 index 00000000000..d23f9f6ed41 --- /dev/null +++ b/gdb/dstread.c @@ -0,0 +1,1665 @@ +/* Read apollo DST symbol tables and convert to internal format, for GDB. + Contributed by Troy Rollo, University of NSW (troy@cbme.unsw.edu.au). + Copyright 1993 Free Software Foundation, Inc. + +This file is part of GDB. + +This program 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 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "defs.h" +#include "symtab.h" +#include "gdbtypes.h" +#include "breakpoint.h" +#include "bfd.h" +#include "symfile.h" +#include "objfiles.h" +#include "buildsym.h" +#include "obstack.h" + +#include "gdb_string.h" + +#include "dst.h" + +CORE_ADDR cur_src_start_addr, cur_src_end_addr; +dst_sec blocks_info, lines_info, symbols_info; + +/* Vector of line number information. */ + +static struct linetable *line_vector; + +/* Index of next entry to go in line_vector_index. */ + +static int line_vector_index; + +/* Last line number recorded in the line vector. */ + +static int prev_line_number; + +/* Number of elements allocated for line_vector currently. */ + +static int line_vector_length; + +static int +init_dst_sections PARAMS ((int)); + +static void +read_dst_symtab PARAMS ((struct objfile *)); + +static void +find_dst_sections PARAMS ((bfd *, sec_ptr, PTR)); + +static void +dst_symfile_init PARAMS ((struct objfile *)); + +static void +dst_new_init PARAMS ((struct objfile *)); + +static void +dst_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); + +static void +dst_symfile_finish PARAMS ((struct objfile *)); + +static void +dst_end_symtab PARAMS ((struct objfile *)); + +static void +complete_symtab PARAMS ((char *, CORE_ADDR, unsigned int)); + +static void +dst_start_symtab PARAMS ((void)); + +static void +dst_record_line PARAMS ((int, CORE_ADDR)); + +/* Manage the vector of line numbers. */ +/* FIXME: Use record_line instead. */ + +static void +dst_record_line (line, pc) + int line; + CORE_ADDR pc; +{ + struct linetable_entry *e; + /* Make sure line vector is big enough. */ + + if (line_vector_index + 2 >= line_vector_length) + { + line_vector_length *= 2; + line_vector = (struct linetable *) + xrealloc ((char *) line_vector, sizeof (struct linetable) + + (line_vector_length + * sizeof (struct linetable_entry))); + } + + e = line_vector->item + line_vector_index++; + e->line = line; e->pc = pc; +} + +/* Start a new symtab for a new source file. + It indicates the start of data for one original source file. */ +/* FIXME: use start_symtab, like coffread.c now does. */ + +static void +dst_start_symtab () +{ + /* Initialize the source file line number information for this file. */ + + if (line_vector) /* Unlikely, but maybe possible? */ + free ((PTR)line_vector); + line_vector_index = 0; + line_vector_length = 1000; + prev_line_number = -2; /* Force first line number to be explicit */ + line_vector = (struct linetable *) + xmalloc (sizeof (struct linetable) + + line_vector_length * sizeof (struct linetable_entry)); +} + +/* Save the vital information from when starting to read a file, + for use when closing off the current file. + NAME is the file name the symbols came from, START_ADDR is the first + text address for the file, and SIZE is the number of bytes of text. */ + +static void +complete_symtab (name, start_addr, size) + char *name; + CORE_ADDR start_addr; + unsigned int size; +{ + last_source_file = savestring (name, strlen (name)); + cur_src_start_addr = start_addr; + cur_src_end_addr = start_addr + size; + + if (current_objfile -> ei.entry_point >= cur_src_start_addr && + current_objfile -> ei.entry_point < cur_src_end_addr) + { + current_objfile -> ei.entry_file_lowpc = cur_src_start_addr; + current_objfile -> ei.entry_file_highpc = cur_src_end_addr; + } +} + +/* Finish the symbol definitions for one main source file, + close off all the lexical contexts for that file + (creating struct block's for them), then make the + struct symtab for that file and put it in the list of all such. */ +/* FIXME: Use end_symtab, like coffread.c now does. */ + +static void +dst_end_symtab (objfile) + struct objfile *objfile; +{ + register struct symtab *symtab; + register struct blockvector *blockvector; + register struct linetable *lv; + + /* Create the blockvector that points to all the file's blocks. */ + + blockvector = make_blockvector (objfile); + + /* Now create the symtab object for this source file. */ + symtab = allocate_symtab (last_source_file, objfile); + + /* Fill in its components. */ + symtab->blockvector = blockvector; + symtab->free_code = free_linetable; + symtab->free_ptr = 0; + symtab->filename = last_source_file; + symtab->dirname = NULL; + symtab->debugformat = obsavestring ("Apollo DST", 10, + &objfile -> symbol_obstack); + lv = line_vector; + lv->nitems = line_vector_index; + symtab->linetable = (struct linetable *) + xrealloc ((char *) lv, (sizeof (struct linetable) + + lv->nitems * sizeof (struct linetable_entry))); + + free_named_symtabs (symtab->filename); + + /* Reinitialize for beginning of new file. */ + line_vector = 0; + line_vector_length = -1; + last_source_file = NULL; +} + +/* dst_symfile_init () + is the dst-specific initialization routine for reading symbols. + + We will only be called if this is a DST or DST-like file. + BFD handles figuring out the format of the file, and code in symtab.c + uses BFD's determination to vector to us. + + The ultimate result is a new symtab (or, FIXME, eventually a psymtab). */ + +static void +dst_symfile_init (objfile) + struct objfile *objfile; +{ + asection *section; + bfd *abfd = objfile->obfd; + + init_entry_point_info (objfile); + +} + +/* This function is called for every section; it finds the outer limits + of the line table (minimum and maximum file offset) so that the + mainline code can read the whole thing for efficiency. */ + +/* ARGSUSED */ +static void +find_dst_sections (abfd, asect, vpinfo) + bfd *abfd; + sec_ptr asect; + PTR vpinfo; +{ + int size, count; + long base; + file_ptr offset, maxoff; + dst_sec *section; + +/* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */ + size = asect->_raw_size; + offset = asect->filepos; + base = asect->vma; +/* End of warning */ + + section = NULL; + if (!strcmp(asect->name, ".blocks")) + section = &blocks_info; + else if (!strcmp(asect->name, ".lines")) + section = &lines_info; + else if (!strcmp(asect->name, ".symbols")) + section = &symbols_info; + if (!section) + return; + section->size = size; + section->position = offset; + section->base = base; +} + + +/* The BFD for this file -- only good while we're actively reading + symbols into a psymtab or a symtab. */ + +static bfd *symfile_bfd; + +/* Read a symbol file, after initialization by dst_symfile_init. */ +/* FIXME! Addr and Mainline are not used yet -- this will not work for + shared libraries or add_file! */ + +/* ARGSUSED */ +static void +dst_symfile_read (objfile, section_offsets, mainline) + struct objfile *objfile; + struct section_offsets *section_offsets; + int mainline; +{ + bfd *abfd = objfile->obfd; + char *name = bfd_get_filename (abfd); + int desc; + register int val; + int num_symbols; + int symtab_offset; + int stringtab_offset; + + symfile_bfd = abfd; /* Kludge for swap routines */ + +/* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */ + desc = fileno ((FILE *)(abfd->iostream)); /* File descriptor */ + + /* Read the line number table, all at once. */ + bfd_map_over_sections (abfd, find_dst_sections, (PTR)NULL); + + val = init_dst_sections (desc); + if (val < 0) + error ("\"%s\": error reading debugging symbol tables\n", name); + + init_minimal_symbol_collection (); + make_cleanup (discard_minimal_symbols, 0); + + /* Now that the executable file is positioned at symbol table, + process it and define symbols accordingly. */ + + read_dst_symtab (objfile); + + /* Sort symbols alphabetically within each block. */ + + { + struct symtab *s; + for (s = objfile -> symtabs; s != NULL; s = s -> next) + { + sort_symtab_syms (s); + } + } + + /* Install any minimal symbols that have been collected as the current + minimal symbols for this objfile. */ + + install_minimal_symbols (objfile); +} + +static void +dst_new_init (ignore) + struct objfile *ignore; +{ + /* Nothin' to do */ +} + +/* Perform any local cleanups required when we are done with a particular + objfile. I.E, we are in the process of discarding all symbol information + for an objfile, freeing up all memory held for it, and unlinking the + objfile struct from the global list of known objfiles. */ + +static void +dst_symfile_finish (objfile) + struct objfile *objfile; +{ + /* Nothing to do */ +} + + +/* Get the next line number from the DST. Returns 0 when we hit an + * end directive or cannot continue for any other reason. + * + * Note that ordinary pc deltas are multiplied by two. Apparently + * this is what was really intended. + */ +static int +get_dst_line(buffer, pc) + signed char **buffer; + long *pc; +{ + static last_pc = 0; + static long last_line = 0; + static int last_file = 0; + dst_ln_entry_ptr_t entry; + int size; + dst_src_loc_t *src_loc; + + if (*pc != -1) + { + last_pc = *pc; + *pc = -1; + } + entry = (dst_ln_entry_ptr_t) *buffer; + + while (dst_ln_ln_delta(*entry) == dst_ln_escape_flag) + { + switch(entry->esc.esc_code) + { + case dst_ln_pad: + size = 1; /* pad byte */ + break; + case dst_ln_file: + /* file escape. Next 4 bytes are a dst_src_loc_t */ + size = 5; + src_loc = (dst_src_loc_t *) (*buffer + 1); + last_line = src_loc->line_number; + last_file = src_loc->file_index; + break; + case dst_ln_dln1_dpc1: + /* 1 byte line delta, 1 byte pc delta */ + last_line += (*buffer)[1]; + last_pc += 2 * (unsigned char) (*buffer)[2]; + dst_record_line(last_line, last_pc); + size = 3; + break; + case dst_ln_dln2_dpc2: + /* 2 bytes line delta, 2 bytes pc delta */ + last_line += *(short *) (*buffer + 1); + last_pc += 2 * (*(short *) (*buffer + 3)); + size = 5; + dst_record_line(last_line, last_pc); + break; + case dst_ln_ln4_pc4: + /* 4 bytes ABSOLUTE line number, 4 bytes ABSOLUTE pc */ + last_line = *(unsigned long *) (*buffer + 1); + last_pc = *(unsigned long *) (*buffer + 5); + size = 9; + dst_record_line(last_line, last_pc); + break; + case dst_ln_dln1_dpc0: + /* 1 byte line delta, pc delta = 0 */ + size = 2; + last_line+= (*buffer)[1]; + break; + case dst_ln_ln_off_1: + /* statement escape, stmt # = 1 (2nd stmt on line) */ + size = 1; + break; + case dst_ln_ln_off: + /* statement escape, stmt # = next byte */ + size = 2; + break; + case dst_ln_entry: + /* entry escape, next byte is entry number */ + size = 2; + break; + case dst_ln_exit: + /* exit escape */ + size = 1; + break; + case dst_ln_stmt_end: + /* gap escape, 4 bytes pc delta */ + size = 5; + /* last_pc += 2 * (*(long *) (*buffer + 1)); */ + /* Apparently this isn't supposed to actually modify + * the pc value. Totally weird. + */ + break; + case dst_ln_escape_11: + case dst_ln_escape_12: + case dst_ln_escape_13: + size = 1; + break; + case dst_ln_nxt_byte: + /* This shouldn't happen. If it does, we're SOL */ + return 0; + break; + case dst_ln_end: + /* end escape, final entry follows */ + return 0; + } + *buffer += (size < 0) ? -size : size; + entry = (dst_ln_entry_ptr_t) *buffer; + } + last_line += dst_ln_ln_delta(*entry); + last_pc += entry->delta.pc_delta * 2; + (*buffer)++; + dst_record_line(last_line, last_pc); + return 1; +} + +static void +enter_all_lines(buffer, address) + char *buffer; + long address; +{ + if (buffer) + while (get_dst_line(&buffer, &address)); +} + +static int +get_dst_entry(buffer, ret_entry) + char *buffer; + dst_rec_ptr_t *ret_entry; +{ + int size; + dst_rec_ptr_t entry; + static int last_type; + int ar_size; + static unsigned lu3; + + entry = (dst_rec_ptr_t) buffer; + switch(entry->rec_type) + { + case dst_typ_pad: + size = 0; + break; + case dst_typ_comp_unit: + size = sizeof(DST_comp_unit(entry)); + break; + case dst_typ_section_tab: + size = sizeof(DST_section_tab(entry)) + + ((int) DST_section_tab(entry).number_of_sections + - dst_dummy_array_size) * sizeof(long); + break; + case dst_typ_file_tab: + size = sizeof(DST_file_tab(entry)) + + ((int) DST_file_tab(entry).number_of_files + - dst_dummy_array_size) * sizeof(dst_file_desc_t); + break; + case dst_typ_block: + size = sizeof(DST_block(entry)) + + ((int) DST_block(entry).n_of_code_ranges + - dst_dummy_array_size) * sizeof(dst_code_range_t); + break; + case dst_typ_5: + size = -1; + break; + case dst_typ_var: + size = sizeof(DST_var(entry)) - + sizeof(dst_var_loc_long_t) * dst_dummy_array_size + + DST_var(entry).no_of_locs * + ( DST_var(entry).short_locs ? + sizeof(dst_var_loc_short_t): + sizeof(dst_var_loc_long_t)); + break; + case dst_typ_pointer: + size = sizeof(DST_pointer(entry)); + break; + case dst_typ_array: + size = sizeof(DST_array(entry)); + break; + case dst_typ_subrange: + size = sizeof(DST_subrange(entry)); + break; + case dst_typ_set: + size = sizeof(DST_set(entry)); + break; + case dst_typ_implicit_enum: + size = sizeof(DST_implicit_enum(entry)) + + ((int) DST_implicit_enum(entry).nelems + - dst_dummy_array_size) * sizeof(dst_rel_offset_t); + break; + case dst_typ_explicit_enum: + size = sizeof(DST_explicit_enum(entry)) + + ((int) DST_explicit_enum(entry).nelems + - dst_dummy_array_size) * sizeof(dst_enum_elem_t); + break; + case dst_typ_short_rec: + size = sizeof(DST_short_rec(entry)) + + DST_short_rec(entry).nfields * sizeof(dst_short_field_t) + - dst_dummy_array_size * sizeof(dst_field_t); + break; + case dst_typ_short_union: + size = sizeof(DST_short_union(entry)) + + DST_short_union(entry).nfields * sizeof(dst_short_field_t) + - dst_dummy_array_size * sizeof(dst_field_t); + break; + case dst_typ_file: + size = sizeof(DST_file(entry)); + break; + case dst_typ_offset: + size = sizeof(DST_offset(entry)); + break; + case dst_typ_alias: + size = sizeof(DST_alias(entry)); + break; + case dst_typ_signature: + size = sizeof(DST_signature(entry)) + + ((int) DST_signature(entry).nargs - + dst_dummy_array_size) * sizeof(dst_arg_t); + break; + case dst_typ_21: + size = -1; + break; + case dst_typ_old_label: + size = sizeof(DST_old_label(entry)); + break; + case dst_typ_scope: + size = sizeof(DST_scope(entry)); + break; + case dst_typ_end_scope: + size = 0; + break; + case dst_typ_25: + case dst_typ_26: + size = -1; + break; + case dst_typ_string_tab: + case dst_typ_global_name_tab: + size = sizeof(DST_string_tab(entry)) + + DST_string_tab(entry).length + - dst_dummy_array_size; + break; + case dst_typ_forward: + size = sizeof(DST_forward(entry)); + get_dst_entry((char *) entry + DST_forward(entry).rec_off, &entry); + break; + case dst_typ_aux_size: + size = sizeof(DST_aux_size(entry)); + break; + case dst_typ_aux_align: + size = sizeof(DST_aux_align(entry)); + break; + case dst_typ_aux_field_size: + size = sizeof(DST_aux_field_size(entry)); + break; + case dst_typ_aux_field_off: + size = sizeof(DST_aux_field_off(entry)); + break; + case dst_typ_aux_field_align: + size = sizeof(DST_aux_field_align(entry)); + break; + case dst_typ_aux_qual: + size = sizeof(DST_aux_qual(entry)); + break; + case dst_typ_aux_var_bound: + size = sizeof(DST_aux_var_bound(entry)); + break; + case dst_typ_extension: + size = DST_extension(entry).rec_size; + break; + case dst_typ_string: + size = sizeof(DST_string(entry)); + break; + case dst_typ_old_entry: + size = 48; /* Obsolete entry type */ + break; + case dst_typ_const: + size = sizeof(DST_const(entry)) + + DST_const(entry).value.length + - sizeof(DST_const(entry).value.val); + break; + case dst_typ_reference: + size = sizeof(DST_reference(entry)); + break; + case dst_typ_old_record: + case dst_typ_old_union: + case dst_typ_record: + case dst_typ_union: + size = sizeof(DST_record(entry)) + + ((int) DST_record(entry).nfields + - dst_dummy_array_size) * sizeof(dst_field_t); + break; + case dst_typ_aux_type_deriv: + size = sizeof(DST_aux_type_deriv(entry)); + break; + case dst_typ_locpool: + size = sizeof(DST_locpool(entry)) + + ((int) DST_locpool(entry).length - + dst_dummy_array_size); + break; + case dst_typ_variable: + size = sizeof(DST_variable(entry)); + break; + case dst_typ_label: + size = sizeof(DST_label(entry)); + break; + case dst_typ_entry: + size = sizeof(DST_entry(entry)); + break; + case dst_typ_aux_lifetime: + size = sizeof(DST_aux_lifetime(entry)); + break; + case dst_typ_aux_ptr_base: + size = sizeof(DST_aux_ptr_base(entry)); + break; + case dst_typ_aux_src_range: + size = sizeof(DST_aux_src_range(entry)); + break; + case dst_typ_aux_reg_val: + size = sizeof(DST_aux_reg_val(entry)); + break; + case dst_typ_aux_unit_names: + size = sizeof(DST_aux_unit_names(entry)) + + ((int) DST_aux_unit_names(entry).number_of_names + - dst_dummy_array_size) * sizeof(dst_rel_offset_t); + break; + case dst_typ_aux_sect_info: + size = sizeof(DST_aux_sect_info(entry)) + + ((int) DST_aux_sect_info(entry).number_of_refs + - dst_dummy_array_size) * sizeof(dst_sect_ref_t); + break; + default: + size = -1; + break; + } + if (size == -1) + { + fprintf_unfiltered(gdb_stderr, "Warning: unexpected DST entry type (%d) found\nLast valid entry was of type: %d\n", + (int) entry->rec_type, + last_type); + fprintf_unfiltered(gdb_stderr, "Last unknown_3 value: %d\n", lu3); + size = 0; + } + else + last_type = entry->rec_type; + if (size & 1) /* Align on a word boundary */ + size++; + size += 2; + *ret_entry = entry; + return size; +} + +static int next_dst_entry(buffer, entry, table) + char **buffer; + dst_rec_ptr_t *entry; + dst_sec *table; +{ + if (*buffer - table->buffer >= table->size) + { + *entry = NULL; + return 0; + } + *buffer += get_dst_entry(*buffer, entry); + return 1; +} + +#define NEXT_BLK(a, b) next_dst_entry(a, b, &blocks_info) +#define NEXT_SYM(a, b) next_dst_entry(a, b, &symbols_info) +#define DST_OFFSET(a, b) ((char *) (a) + (b)) + +static dst_rec_ptr_t section_table = NULL; + +char * +get_sec_ref(ref) + dst_sect_ref_t *ref; +{ + dst_sec *section = NULL; + long offset; + + if (!section_table || !ref->sect_index) + return NULL; + offset = DST_section_tab(section_table).section_base[ref->sect_index-1] + + ref->sect_offset; + if (offset >= blocks_info.base && + offset < blocks_info.base + blocks_info.size) + section = &blocks_info; + else if (offset >= symbols_info.base && + offset < symbols_info.base + symbols_info.size) + section = &symbols_info; + else if (offset >= lines_info.base && + offset < lines_info.base + lines_info.size) + section = &lines_info; + if (!section) + return NULL; + return section->buffer + (offset - section->base); +} + +CORE_ADDR +dst_get_addr(int section, long offset) +{ + if (!section_table || !section) + return 0; + return DST_section_tab(section_table).section_base[section-1] + offset; +} + +CORE_ADDR +dst_sym_addr(ref) + dst_sect_ref_t *ref; +{ + if (!section_table || !ref->sect_index) + return 0; + return DST_section_tab(section_table).section_base[ref->sect_index-1] + + ref->sect_offset; +} + +static struct type * +create_new_type(objfile) + struct objfile *objfile; +{ + struct type *type; + + type = (struct type *) + obstack_alloc (&objfile->symbol_obstack, sizeof (struct type)); + memset(type, 0, sizeof(struct type)); + return type; +} + +static struct symbol * +create_new_symbol(objfile, name) + struct objfile *objfile; + char *name; +{ + struct symbol *sym = (struct symbol *) + obstack_alloc (&objfile->symbol_obstack, sizeof (struct symbol)); + memset (sym, 0, sizeof (struct symbol)); + SYMBOL_NAME (sym) = obsavestring (name, strlen (name), + &objfile->symbol_obstack); + SYMBOL_VALUE (sym) = 0; + SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; + + SYMBOL_CLASS (sym) = LOC_BLOCK; + return sym; +}; + +static struct type * +decode_dst_type PARAMS ((struct objfile *, dst_rec_ptr_t)); + +static struct type * +decode_type_desc(objfile, type_desc, base) + struct objfile *objfile; + dst_type_t *type_desc; + dst_rec_ptr_t base; +{ + struct type *type; + dst_rec_ptr_t entry; + if (type_desc->std_type.user_defined_type) + { + entry = (dst_rec_ptr_t) DST_OFFSET(base, + dst_user_type_offset(*type_desc)); + type = decode_dst_type(objfile, entry); + } + else + { + switch(type_desc->std_type.dtc) + { + case dst_int8_type: + type = builtin_type_signed_char; + break; + case dst_int16_type: + type = builtin_type_short; + break; + case dst_int32_type: + type = builtin_type_long; + break; + case dst_uint8_type: + type = builtin_type_unsigned_char; + break; + case dst_uint16_type: + type = builtin_type_unsigned_short; + break; + case dst_uint32_type: + type = builtin_type_unsigned_long; + break; + case dst_real32_type: + type = builtin_type_float; + break; + case dst_real64_type: + type = builtin_type_double; + break; + case dst_complex_type: + type = builtin_type_complex; + break; + case dst_dcomplex_type: + type = builtin_type_double_complex; + break; + case dst_bool8_type: + type = builtin_type_char; + break; + case dst_bool16_type: + type = builtin_type_short; + break; + case dst_bool32_type: + type = builtin_type_long; + break; + case dst_char_type: + type = builtin_type_char; + break; + /* The next few are more complex. I will take care + * of them properly at a later point. + */ + case dst_string_type: + type = builtin_type_void; + break; + case dst_ptr_type: + type = builtin_type_void; + break; + case dst_set_type: + type = builtin_type_void; + break; + case dst_proc_type: + type = builtin_type_void; + break; + case dst_func_type: + type = builtin_type_void; + break; + /* Back tto some ordinary ones */ + case dst_void_type: + type = builtin_type_void; + break; + case dst_uchar_type: + type = builtin_type_unsigned_char; + break; + default: + type = builtin_type_void; + break; + } + } + return type; +} + +struct structure_list + { + struct structure_list *next; + struct type *type; + }; + +static struct structure_list *struct_list = NULL; + +static struct type * +find_dst_structure(name) + char *name; +{ + struct structure_list *element; + + for (element = struct_list; element; element = element->next) + if (!strcmp(name, TYPE_NAME(element->type))) + return element->type; + return NULL; +} + + +static struct type * +decode_dst_structure(objfile, entry, code, version) + struct objfile *objfile; + dst_rec_ptr_t entry; + int code; + int version; +{ + struct type *type, *child_type; + char *struct_name; + char *name, *field_name; + int i; + int fieldoffset, fieldsize; + dst_type_t type_desc; + struct structure_list *element; + + struct_name = DST_OFFSET(entry, DST_record(entry).noffset); + name = concat( (code == TYPE_CODE_UNION)?"union ":"struct ", + struct_name, NULL); + type = find_dst_structure(name); + if (type) + { + free((PTR) name); + return type; + } + type = create_new_type(objfile); + TYPE_NAME(type) = obstack_copy0 (&objfile->symbol_obstack, + name, strlen(name)); + free((PTR) name); + TYPE_CODE(type) = code; + TYPE_LENGTH(type) = DST_record(entry).size; + TYPE_NFIELDS(type) = DST_record(entry).nfields; + TYPE_FIELDS(type) = (struct field *) + obstack_alloc (&objfile->symbol_obstack, sizeof (struct field) * + DST_record(entry).nfields); + fieldoffset = fieldsize = 0; + INIT_CPLUS_SPECIFIC(type); + element = (struct structure_list *) + xmalloc(sizeof(struct structure_list)); + element->type = type; + element->next = struct_list; + struct_list = element; + for (i = 0; i < DST_record(entry).nfields; i++) + { + switch (version) + { + case 2: + field_name = DST_OFFSET(entry, + DST_record(entry).f.ofields[i].noffset); + fieldoffset = DST_record(entry).f.ofields[i].foffset*8 + + DST_record(entry).f.ofields[i].bit_offset; + fieldsize = DST_record(entry).f.ofields[i].size; + type_desc = DST_record(entry).f.ofields[i].type_desc; + break; + case 1: + field_name = DST_OFFSET(entry, + DST_record(entry).f.fields[i].noffset); + type_desc = DST_record(entry).f.fields[i].type_desc; + switch(DST_record(entry).f.fields[i].f.field_loc.format_tag) + { + case dst_field_byte: + fieldoffset = DST_record(entry).f. + fields[i].f.field_byte.offset * 8; + fieldsize = -1; + break; + case dst_field_bit: + fieldoffset = DST_record(entry).f. + fields[i].f.field_bit.byte_offset * 8 + + DST_record(entry).f. + fields[i].f.field_bit.bit_offset; + fieldsize = DST_record(entry).f. + fields[i].f.field_bit.nbits; + break; + case dst_field_loc: + fieldoffset += fieldsize; + fieldsize = -1; + break; + } + break; + case 0: + field_name = DST_OFFSET(entry, + DST_record(entry).f.sfields[i].noffset); + fieldoffset = DST_record(entry).f.sfields[i].foffset; + type_desc = DST_record(entry).f.sfields[i].type_desc; + if (i < DST_record(entry).nfields - 1) + fieldsize = DST_record(entry).f.sfields[i+1].foffset; + else + fieldsize = DST_record(entry).size; + fieldsize -= fieldoffset; + fieldoffset *= 8; + fieldsize *= 8; + } + TYPE_FIELDS(type)[i].name = + obstack_copy0 (&objfile->symbol_obstack, + field_name, strlen(field_name)); + TYPE_FIELDS(type)[i].type = decode_type_desc(objfile, + &type_desc, + entry); + if (fieldsize == -1) + fieldsize = TYPE_LENGTH(TYPE_FIELDS(type)[i].type) * + 8; + TYPE_FIELDS(type)[i].bitsize = fieldsize; + TYPE_FIELDS(type)[i].bitpos = fieldoffset; + } + return type; +} + +static struct type * +decode_dst_type(objfile, entry) + struct objfile *objfile; + dst_rec_ptr_t entry; +{ + struct type *child_type, *type, *range_type, *index_type; + + switch(entry->rec_type) + { + case dst_typ_var: + return decode_type_desc(objfile, + &DST_var(entry).type_desc, + entry); + break; + case dst_typ_variable: + return decode_type_desc(objfile, + &DST_variable(entry).type_desc, + entry); + break; + case dst_typ_short_rec: + return decode_dst_structure(objfile, entry, TYPE_CODE_STRUCT,0); + case dst_typ_short_union: + return decode_dst_structure(objfile, entry, TYPE_CODE_UNION, 0); + case dst_typ_union: + return decode_dst_structure(objfile, entry, TYPE_CODE_UNION, 1); + case dst_typ_record: + return decode_dst_structure(objfile, entry, TYPE_CODE_STRUCT,1); + case dst_typ_old_union: + return decode_dst_structure(objfile, entry, TYPE_CODE_UNION, 2); + case dst_typ_old_record: + return decode_dst_structure(objfile, entry, TYPE_CODE_STRUCT,2); + case dst_typ_pointer: + return make_pointer_type( + decode_type_desc(objfile, + &DST_pointer(entry).type_desc, + entry), + NULL); + case dst_typ_array: + child_type = decode_type_desc(objfile, + &DST_pointer(entry).type_desc, + entry); + index_type = lookup_fundamental_type(objfile, + FT_INTEGER); + range_type = create_range_type ((struct type *) NULL, + index_type, DST_array(entry).lo_bound, + DST_array(entry).hi_bound); + return create_array_type ((struct type *) NULL, child_type, + range_type); + case dst_typ_alias: + return decode_type_desc(objfile, + &DST_alias(entry).type_desc, + entry); + default: + return builtin_type_int; + } +} + +struct symbol_list { + struct symbol_list *next; + struct symbol *symbol; +}; + +static struct symbol_list *dst_global_symbols = NULL; +static int total_globals = 0; + +static void +decode_dst_locstring(locstr, sym) + char *locstr; + struct symbol *sym; +{ + dst_loc_entry_t *entry, *next_entry; + CORE_ADDR temp; + int count = 0; + + while(1) + { + if (count++ == 100) + { + fprintf_unfiltered(gdb_stderr, "Error reading locstring\n"); + break; + } + entry = (dst_loc_entry_t *) locstr; + next_entry = (dst_loc_entry_t *) (locstr + 1); + switch (entry->header.code) + { + case dst_lsc_end: /* End of string */ + return; + case dst_lsc_indirect:/* Indirect through previous. Arg == 6 */ + /* Or register ax x == arg */ + if (entry->header.arg < 6) + { + SYMBOL_CLASS(sym) = LOC_REGISTER; + SYMBOL_VALUE(sym) = entry->header.arg + 8; + } + /* We predict indirects */ + locstr++; + break; + case dst_lsc_dreg: + SYMBOL_CLASS(sym) = LOC_REGISTER; + SYMBOL_VALUE(sym) = entry->header.arg; + locstr++; + break; + case dst_lsc_section:/* Section (arg+1) */ + SYMBOL_VALUE(sym) = dst_get_addr(entry->header.arg+1, 0); + locstr++; + break; + case dst_lsc_sec_byte: /* Section (next_byte+1) */ + SYMBOL_VALUE(sym) = dst_get_addr(locstr[1]+1, 0); + locstr+=2; + break; + case dst_lsc_add: /* Add (arg+1)*2 */ + case dst_lsc_sub: /* Subtract (arg+1)*2 */ + temp = (entry->header.arg + 1) * 2; + locstr++; + if (*locstr == dst_multiply_256) + { + temp <<= 8; + locstr++; + } + switch(entry->header.code) + { + case dst_lsc_add: + if (SYMBOL_CLASS(sym) == LOC_LOCAL) + SYMBOL_CLASS(sym) = LOC_ARG; + SYMBOL_VALUE(sym) += temp; + break; + case dst_lsc_sub: + SYMBOL_VALUE(sym) -= temp; + break; + } + break; + case dst_lsc_add_byte: + case dst_lsc_sub_byte: + switch (entry->header.arg & 0x03) + { + case 1: + temp = (unsigned char) locstr[1]; + locstr += 2; + break; + case 2: + temp = * (unsigned short *) (locstr + 1); + locstr += 3; + break; + case 3: + temp = * (unsigned long *) (locstr + 1); + locstr += 5; + break; + } + if (*locstr == dst_multiply_256) + { + temp <<= 8; + locstr++; + } + switch(entry->header.code) + { + case dst_lsc_add_byte: + if (SYMBOL_CLASS(sym) == LOC_LOCAL) + SYMBOL_CLASS(sym) = LOC_ARG; + SYMBOL_VALUE(sym) += temp; + break; + case dst_lsc_sub_byte: + SYMBOL_VALUE(sym) -= temp; + break; + } + break; + case dst_lsc_sbreg: /* Stack base register (frame pointer). Arg==0*/ + if (next_entry->header.code != dst_lsc_indirect) + { + SYMBOL_VALUE(sym) = 0; + SYMBOL_CLASS(sym) = LOC_STATIC; + return; + } + SYMBOL_VALUE(sym) = 0; + SYMBOL_CLASS(sym) = LOC_LOCAL; + locstr++; + break; + default: + SYMBOL_VALUE(sym) = 0; + SYMBOL_CLASS(sym) = LOC_STATIC; + return; + } + } +} + +static struct symbol_list * +process_dst_symbols(objfile, entry, name, nsyms_ret) + struct objfile *objfile; + dst_rec_ptr_t entry; + char *name; + int *nsyms_ret; +{ + struct symbol_list *list = NULL, *element; + struct symbol *sym; + char *symname; + int nsyms = 0; + char *location; + long line; + dst_type_t symtype; + struct type *type; + dst_var_attr_t attr; + dst_var_loc_t loc_type; + unsigned loc_index; + long loc_value; + + if (!entry) + { + *nsyms_ret = 0; + return NULL; + } + location = (char *) entry; + while (NEXT_SYM(&location, &entry) && + entry->rec_type != dst_typ_end_scope) + { + if (entry->rec_type == dst_typ_var) + { + if (DST_var(entry).short_locs) + { + loc_type = DST_var(entry).locs.shorts[0].loc_type; + loc_index = DST_var(entry).locs.shorts[0].loc_index; + loc_value = DST_var(entry).locs.shorts[0].location; + } + else + { + loc_type = DST_var(entry).locs.longs[0].loc_type; + loc_index = DST_var(entry).locs.longs[0].loc_index; + loc_value = DST_var(entry).locs.longs[0].location; + } + if (loc_type == dst_var_loc_external) + continue; + symname = DST_OFFSET(entry, DST_var(entry).noffset); + line = DST_var(entry).src_loc.line_number; + symtype = DST_var(entry).type_desc; + attr = DST_var(entry).attributes; + } + else if (entry->rec_type == dst_typ_variable) + { + symname = DST_OFFSET(entry, + DST_variable(entry).noffset); + line = DST_variable(entry).src_loc.line_number; + symtype = DST_variable(entry).type_desc; + attr = DST_variable(entry).attributes; + } + else + { + continue; + } + if (symname && name && !strcmp(symname, name)) + /* It's the function return value */ + continue; + sym = create_new_symbol(objfile, symname); + + if ((attr & (1<<dst_var_attr_global)) || + (attr & (1<<dst_var_attr_static))) + SYMBOL_CLASS(sym) = LOC_STATIC; + else + SYMBOL_CLASS(sym) = LOC_LOCAL; + SYMBOL_LINE(sym) = line; + SYMBOL_TYPE(sym) = decode_type_desc(objfile, &symtype, + entry); + SYMBOL_VALUE(sym) = 0; + switch (entry->rec_type) + { + case dst_typ_var: + switch(loc_type) + { + case dst_var_loc_abs: + SYMBOL_VALUE_ADDRESS(sym) = loc_value; + break; + case dst_var_loc_sect_off: + case dst_var_loc_ind_sect_off: /* What is this? */ + SYMBOL_VALUE_ADDRESS(sym) = dst_get_addr( + loc_index, + loc_value); + break; + case dst_var_loc_ind_reg_rel: /* What is this? */ + case dst_var_loc_reg_rel: + /* If it isn't fp relative, specify the + * register it's relative to. + */ + if (loc_index) + { + sym->aux_value.basereg = loc_index; + } + SYMBOL_VALUE(sym) = loc_value; + if (loc_value > 0 && + SYMBOL_CLASS(sym) == LOC_BASEREG) + SYMBOL_CLASS(sym) = LOC_BASEREG_ARG; + break; + case dst_var_loc_reg: + SYMBOL_VALUE(sym) = loc_index; + SYMBOL_CLASS(sym) = LOC_REGISTER; + break; + } + break; + case dst_typ_variable: + /* External variable..... don't try to interpret + * its nonexistant locstring. + */ + if (DST_variable(entry).loffset == -1) + continue; + decode_dst_locstring(DST_OFFSET(entry, + DST_variable(entry).loffset), + sym); + } + element = (struct symbol_list *) + xmalloc(sizeof(struct symbol_list)); + + if (attr & (1<<dst_var_attr_global)) + { + element->next = dst_global_symbols; + dst_global_symbols = element; + total_globals++; + } + else + { + element->next = list; + list = element; + nsyms++; + } + element->symbol = sym; + } + *nsyms_ret = nsyms; + return list; +} + + +static struct symbol * +process_dst_function(objfile, entry, name, address) + struct objfile *objfile; + dst_rec_ptr_t entry; + char *name; + CORE_ADDR address; +{ + struct symbol *sym; + struct type *type, *ftype; + dst_rec_ptr_t sym_entry, typ_entry; + char *location; + struct symbol_list *element; + + type = builtin_type_int; + sym = create_new_symbol(objfile, name); + SYMBOL_CLASS(sym) = LOC_BLOCK; + + if (entry) + { + location = (char *) entry; + do + { + NEXT_SYM(&location, &sym_entry); + } while (sym_entry && sym_entry->rec_type != dst_typ_signature); + + if (sym_entry) + { + SYMBOL_LINE(sym) = + DST_signature(sym_entry).src_loc.line_number; + if (DST_signature(sym_entry).result) + { + typ_entry = (dst_rec_ptr_t) + DST_OFFSET(sym_entry, + DST_signature(sym_entry).result); + type = decode_dst_type(objfile, typ_entry); + } + } + } + + if (!type->function_type) + { + ftype = create_new_type(objfile); + type->function_type = ftype; + ftype->target_type = type; + ftype->code = TYPE_CODE_FUNC; + } + SYMBOL_TYPE(sym) = type->function_type; + + /* Now add ourselves to the global symbols list */ + element = (struct symbol_list *) + xmalloc(sizeof(struct symbol_list)); + + element->next = dst_global_symbols; + dst_global_symbols = element; + total_globals++; + element->symbol = sym; + + return sym; +} + +static struct block * +process_dst_block(objfile, entry) + struct objfile *objfile; + dst_rec_ptr_t entry; +{ + struct block *block; + struct symbol *function = NULL; + CORE_ADDR address; + long size; + char *name; + dst_rec_ptr_t child_entry, symbol_entry; + struct block *child_block; + int total_symbols = 0; + char fake_name[20]; + static long fake_seq = 0; + struct symbol_list *symlist, *nextsym; + int symnum; + + if (DST_block(entry).noffset) + name = DST_OFFSET(entry, DST_block(entry).noffset); + else + name = NULL; + if (DST_block(entry).n_of_code_ranges) + { + address = dst_sym_addr( + &DST_block(entry).code_ranges[0].code_start); + size = DST_block(entry).code_ranges[0].code_size; + } + else + { + address = -1; + size = 0; + } + symbol_entry = (dst_rec_ptr_t) get_sec_ref(&DST_block(entry).symbols_start); + switch(DST_block(entry).block_type) + { + /* These are all really functions. Even the "program" type. + * This is because the Apollo OS was written in Pascal, and + * in Pascal, the main procedure is described as the Program. + * Cute, huh? + */ + case dst_block_procedure: + case dst_block_function: + case dst_block_subroutine: + case dst_block_program: + prim_record_minimal_symbol(name, address, mst_text, objfile); + function = process_dst_function( + objfile, + symbol_entry, + name, + address); + enter_all_lines(get_sec_ref(&DST_block(entry).code_ranges[0].lines_start), address); + break; + case dst_block_block_data: + break; + + default: + /* GDB has to call it something, and the module name + * won't cut it + */ + sprintf(fake_name, "block_%08lx", fake_seq++); + function = process_dst_function( + objfile, NULL, fake_name, address); + break; + } + symlist = process_dst_symbols(objfile, symbol_entry, + name, &total_symbols); + block = (struct block *) + obstack_alloc (&objfile->symbol_obstack, + sizeof (struct block) + + (total_symbols - 1) * sizeof (struct symbol *)); + + symnum = 0; + while (symlist) + { + nextsym = symlist->next; + + block->sym[symnum] = symlist->symbol; + + free((PTR) symlist); + symlist = nextsym; + symnum++; + } + BLOCK_NSYMS (block) = total_symbols; + BLOCK_START (block) = address; + BLOCK_END (block) = address + size; + BLOCK_SUPERBLOCK (block) = 0; + if (function) + { + SYMBOL_BLOCK_VALUE (function) = block; + BLOCK_FUNCTION (block) = function; + } + else + BLOCK_FUNCTION (block) = 0; + + if (DST_block(entry).child_block_off) + { + child_entry = (dst_rec_ptr_t) DST_OFFSET(entry, + DST_block(entry).child_block_off); + while (child_entry) + { + child_block = process_dst_block(objfile, child_entry); + if (child_block) + { + if (BLOCK_START(child_block) < + BLOCK_START(block) || + BLOCK_START(block) == -1) + BLOCK_START(block) = + BLOCK_START(child_block); + if (BLOCK_END(child_block) > + BLOCK_END(block) || + BLOCK_END(block) == -1) + BLOCK_END(block) = + BLOCK_END(child_block); + BLOCK_SUPERBLOCK (child_block) = block; + } + if (DST_block(child_entry).sibling_block_off) + child_entry = (dst_rec_ptr_t) DST_OFFSET( + child_entry, + DST_block(child_entry).sibling_block_off); + else + child_entry = NULL; + } + } + record_pending_block (objfile, block, NULL); + return block; +} + + +static void +read_dst_symtab (objfile) + struct objfile *objfile; +{ + char *buffer; + dst_rec_ptr_t entry, file_table, root_block; + char *source_file; + struct block *block, *global_block; + int symnum; + struct symbol_list *nextsym; + int module_num = 0; + struct structure_list *element; + + current_objfile = objfile; + buffer = blocks_info.buffer; + while (NEXT_BLK(&buffer, &entry)) + { + if (entry->rec_type == dst_typ_comp_unit) + { + file_table = (dst_rec_ptr_t) DST_OFFSET(entry, + DST_comp_unit(entry).file_table); + section_table = (dst_rec_ptr_t) DST_OFFSET(entry, + DST_comp_unit(entry).section_table); + root_block = (dst_rec_ptr_t) DST_OFFSET(entry, + DST_comp_unit(entry).root_block_offset); + source_file = DST_OFFSET(file_table, + DST_file_tab(file_table).files[0].noffset); + /* Point buffer to the start of the next comp_unit */ + buffer = DST_OFFSET(entry, + DST_comp_unit(entry).data_size); + dst_start_symtab(); + + block = process_dst_block(objfile, root_block); + + global_block = (struct block *) + obstack_alloc (&objfile->symbol_obstack, + sizeof (struct block) + + (total_globals - 1) * + sizeof (struct symbol *)); + BLOCK_NSYMS(global_block) = total_globals; + for (symnum = 0; symnum < total_globals; symnum++) + { + nextsym = dst_global_symbols->next; + + global_block->sym[symnum] = + dst_global_symbols->symbol; + + free((PTR) dst_global_symbols); + dst_global_symbols = nextsym; + } + dst_global_symbols = NULL; + total_globals = 0; + BLOCK_FUNCTION(global_block) = 0; + BLOCK_START(global_block) = BLOCK_START(block); + BLOCK_END(global_block) = BLOCK_END(block); + BLOCK_SUPERBLOCK(global_block) = 0; + BLOCK_SUPERBLOCK(block) = global_block; + record_pending_block (objfile, global_block, NULL); + + complete_symtab(source_file, + BLOCK_START(block), + BLOCK_END(block) - BLOCK_START(block)); + module_num++; + dst_end_symtab(objfile); + } + } + if (module_num) + prim_record_minimal_symbol("<end_of_program>", + BLOCK_END(block), mst_text, objfile); + /* One more faked symbol to make sure nothing can ever run off the + * end of the symbol table. This one represents the end of the + * text space. It used to be (CORE_ADDR) -1 (effectively the highest + * int possible), but some parts of gdb treated it as a signed + * number and failed comparisons. We could equally use 7fffffff, + * but no functions are ever mapped to an address higher than + * 40000000 + */ + prim_record_minimal_symbol("<end_of_text>", + (CORE_ADDR) 0x40000000, + mst_text, objfile); + while (struct_list) + { + element = struct_list; + struct_list = element->next; + free((PTR) element); + } +} + + +/* Support for line number handling */ +static char *linetab = NULL; +static long linetab_offset; +static unsigned long linetab_size; + +/* Read in all the line numbers for fast lookups later. Leave them in + external (unswapped) format in memory; we'll swap them as we enter + them into GDB's data structures. */ +static int +init_one_section(chan, secinfo) + int chan; + dst_sec *secinfo; +{ + if (secinfo->size == 0 + || lseek(chan, secinfo->position, 0) == -1 + || (secinfo->buffer = xmalloc(secinfo->size)) == NULL + || myread(chan, secinfo->buffer, secinfo->size) == -1) + return 0; + else + return 1; +} + +static int +init_dst_sections (chan) + int chan; +{ + + if (!init_one_section(chan, &blocks_info) || + !init_one_section(chan, &lines_info) || + !init_one_section(chan, &symbols_info)) + return -1; + else + return 0; +} + +/* Fake up support for relocating symbol addresses. FIXME. */ + +struct section_offsets dst_symfile_faker = {0}; + +struct section_offsets * +dst_symfile_offsets (objfile, addr) + struct objfile *objfile; + CORE_ADDR addr; +{ + objfile->num_sections = 1; + return &dst_symfile_faker; +} + +/* Register our ability to parse symbols for DST BFD files */ + +static struct sym_fns dst_sym_fns = +{ + /* FIXME: Can this be integrated with coffread.c? If not, should it be + a separate flavour like ecoff? */ + (enum bfd_flavour)-2, + + dst_new_init, /* sym_new_init: init anything gbl to entire symtab */ + dst_symfile_init, /* sym_init: read initial info, setup for sym_read() */ + dst_symfile_read, /* sym_read: read a symbol file into symtab */ + dst_symfile_finish, /* sym_finish: finished with file, cleanup */ + dst_symfile_offsets, /* sym_offsets: xlate external to internal form */ + NULL /* next: pointer to next struct sym_fns */ +}; + +void +_initialize_dstread () +{ + add_symtab_fns(&dst_sym_fns); +} |