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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [coffread.c] - Rev 280
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/* Read coff symbol tables and convert to internal format, for GDB. Copyright (C) 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. Contributed by David D. Johnson, Brown University (ddj@cs.brown.edu). 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "symtab.h" #include "gdbtypes.h" #include "demangle.h" #include "breakpoint.h" #include "bfd.h" #include "gdb_obstack.h" #include "gdb_string.h" #include <ctype.h> #include "coff/internal.h" /* Internal format of COFF symbols in BFD */ #include "libcoff.h" /* FIXME secret internal data from BFD */ #include "objfiles.h" #include "buildsym.h" #include "gdb-stabs.h" #include "stabsread.h" #include "complaints.h" #include "target.h" #include "gdb_assert.h" #include "block.h" #include "dictionary.h" #include "coff-pe-read.h" extern void _initialize_coffread (void); struct coff_symfile_info { file_ptr min_lineno_offset; /* Where in file lowest line#s are */ file_ptr max_lineno_offset; /* 1+last byte of line#s in file */ CORE_ADDR textaddr; /* Addr of .text section. */ unsigned int textsize; /* Size of .text section. */ struct stab_section_list *stabsects; /* .stab sections. */ asection *stabstrsect; /* Section pointer for .stab section */ char *stabstrdata; }; /* Translate an external name string into a user-visible name. */ #define EXTERNAL_NAME(string, abfd) \ (string[0] == bfd_get_symbol_leading_char(abfd)? string+1: string) /* To be an sdb debug type, type must have at least a basic or primary derived type. Using this rather than checking against T_NULL is said to prevent core dumps if we try to operate on Michael Bloom dbx-in-coff file. */ #define SDB_TYPE(type) (BTYPE(type) | (type & N_TMASK)) /* Core address of start and end of text of current source file. This comes from a ".text" symbol where x_nlinno > 0. */ static CORE_ADDR current_source_start_addr; static CORE_ADDR current_source_end_addr; /* The addresses of the symbol table stream and number of symbols of the object file we are reading (as copied into core). */ static bfd *nlist_bfd_global; static int nlist_nsyms_global; /* Pointers to scratch storage, used for reading raw symbols and auxents. */ static char *temp_sym; static char *temp_aux; /* Local variables that hold the shift and mask values for the COFF file that we are currently reading. These come back to us from BFD, and are referenced by their macro names, as well as internally to the BTYPE, ISPTR, ISFCN, ISARY, ISTAG, and DECREF macros from include/coff/internal.h . */ static unsigned local_n_btmask; static unsigned local_n_btshft; static unsigned local_n_tmask; static unsigned local_n_tshift; #define N_BTMASK local_n_btmask #define N_BTSHFT local_n_btshft #define N_TMASK local_n_tmask #define N_TSHIFT local_n_tshift /* Local variables that hold the sizes in the file of various COFF structures. (We only need to know this to read them from the file -- BFD will then translate the data in them, into `internal_xxx' structs in the right byte order, alignment, etc.) */ static unsigned local_linesz; static unsigned local_symesz; static unsigned local_auxesz; /* This is set if this is a PE format file. */ static int pe_file; /* Chain of typedefs of pointers to empty struct/union types. They are chained thru the SYMBOL_VALUE_CHAIN. */ static struct symbol *opaque_type_chain[HASHSIZE]; /* Simplified internal version of coff symbol table information */ struct coff_symbol { char *c_name; int c_symnum; /* symbol number of this entry */ int c_naux; /* 0 if syment only, 1 if syment + auxent, etc */ long c_value; int c_sclass; int c_secnum; unsigned int c_type; }; extern void stabsread_clear_cache (void); static struct type *coff_read_struct_type (int, int, int, struct objfile *); static struct type *decode_base_type (struct coff_symbol *, unsigned int, union internal_auxent *, struct objfile *); static struct type *decode_type (struct coff_symbol *, unsigned int, union internal_auxent *, struct objfile *); static struct type *decode_function_type (struct coff_symbol *, unsigned int, union internal_auxent *, struct objfile *); static struct type *coff_read_enum_type (int, int, int, struct objfile *); static struct symbol *process_coff_symbol (struct coff_symbol *, union internal_auxent *, struct objfile *); static void patch_opaque_types (struct symtab *); static void enter_linenos (long, int, int, struct objfile *); static void free_linetab (void); static void free_linetab_cleanup (void *ignore); static int init_lineno (bfd *, long, int); static char *getsymname (struct internal_syment *); static char *coff_getfilename (union internal_auxent *); static void free_stringtab (void); static void free_stringtab_cleanup (void *ignore); static int init_stringtab (bfd *, long); static void read_one_sym (struct coff_symbol *, struct internal_syment *, union internal_auxent *); static void coff_symtab_read (long, unsigned int, struct objfile *); /* We are called once per section from coff_symfile_read. We need to examine each section we are passed, check to see if it is something we are interested in processing, and if so, stash away some access information for the section. FIXME: The section names should not be hardwired strings (what should they be? I don't think most object file formats have enough section flags to specify what kind of debug section it is -kingdon). */ static void coff_locate_sections (bfd *abfd, asection *sectp, void *csip) { struct coff_symfile_info *csi; const char *name; csi = (struct coff_symfile_info *) csip; name = bfd_get_section_name (abfd, sectp); if (strcmp (name, ".text") == 0) { csi->textaddr = bfd_section_vma (abfd, sectp); csi->textsize += bfd_section_size (abfd, sectp); } else if (strncmp (name, ".text", sizeof ".text" - 1) == 0) { csi->textsize += bfd_section_size (abfd, sectp); } else if (strcmp (name, ".stabstr") == 0) { csi->stabstrsect = sectp; } else if (strncmp (name, ".stab", sizeof ".stab" - 1) == 0) { const char *s; /* We can have multiple .stab sections if linked with --split-by-reloc. */ for (s = name + sizeof ".stab" - 1; *s != '\0'; s++) if (!isdigit (*s)) break; if (*s == '\0') { struct stab_section_list *n, **pn; n = ((struct stab_section_list *) xmalloc (sizeof (struct stab_section_list))); n->section = sectp; n->next = NULL; for (pn = &csi->stabsects; *pn != NULL; pn = &(*pn)->next) ; *pn = n; /* This will be run after coffstab_build_psymtabs is called in coff_symfile_read, at which point we no longer need the information. */ make_cleanup (xfree, n); } } } /* Return the section_offsets* that CS points to. */ static int cs_to_section (struct coff_symbol *, struct objfile *); struct find_targ_sec_arg { int targ_index; asection **resultp; }; static void find_targ_sec (bfd *abfd, asection *sect, void *obj) { struct find_targ_sec_arg *args = (struct find_targ_sec_arg *) obj; if (sect->target_index == args->targ_index) *args->resultp = sect; } /* Return the bfd_section that CS points to. */ static struct bfd_section* cs_to_bfd_section (struct coff_symbol *cs, struct objfile *objfile) { asection *sect = NULL; struct find_targ_sec_arg args; args.targ_index = cs->c_secnum; args.resultp = § bfd_map_over_sections (objfile->obfd, find_targ_sec, &args); return sect; } /* Return the section number (SECT_OFF_*) that CS points to. */ static int cs_to_section (struct coff_symbol *cs, struct objfile *objfile) { asection *sect = cs_to_bfd_section (cs, objfile); if (sect == NULL) return SECT_OFF_TEXT (objfile); return sect->index; } /* Return the address of the section of a COFF symbol. */ static CORE_ADDR cs_section_address (struct coff_symbol *, bfd *); static CORE_ADDR cs_section_address (struct coff_symbol *cs, bfd *abfd) { asection *sect = NULL; struct find_targ_sec_arg args; CORE_ADDR addr = 0; args.targ_index = cs->c_secnum; args.resultp = § bfd_map_over_sections (abfd, find_targ_sec, &args); if (sect != NULL) addr = bfd_get_section_vma (objfile->obfd, sect); return addr; } /* Look up a coff type-number index. Return the address of the slot where the type for that index is stored. The type-number is in INDEX. This can be used for finding the type associated with that index or for associating a new type with the index. */ static struct type ** coff_lookup_type (int index) { if (index >= type_vector_length) { int old_vector_length = type_vector_length; type_vector_length *= 2; if (index /* is still */ >= type_vector_length) type_vector_length = index * 2; type_vector = (struct type **) xrealloc ((char *) type_vector, type_vector_length * sizeof (struct type *)); memset (&type_vector[old_vector_length], 0, (type_vector_length - old_vector_length) * sizeof (struct type *)); } return &type_vector[index]; } /* Make sure there is a type allocated for type number index and return the type object. This can create an empty (zeroed) type object. */ static struct type * coff_alloc_type (int index) { struct type **type_addr = coff_lookup_type (index); struct type *type = *type_addr; /* If we are referring to a type not known at all yet, allocate an empty type for it. We will fill it in later if we find out how. */ if (type == NULL) { type = alloc_type (current_objfile); *type_addr = type; } return type; } /* Start a new symtab for a new source file. This is called when a COFF ".file" symbol is seen; it indicates the start of data for one original source file. */ static void coff_start_symtab (char *name) { start_symtab ( /* We fill in the filename later. start_symtab puts this pointer into last_source_file and we put it in subfiles->name, which end_symtab frees; that's why it must be malloc'd. */ xstrdup (name), /* We never know the directory name for COFF. */ NULL, /* The start address is irrelevant, since we set last_source_start_addr in coff_end_symtab. */ 0); record_debugformat ("COFF"); } /* 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 (char *name, CORE_ADDR start_addr, unsigned int size) { if (last_source_file != NULL) xfree (last_source_file); last_source_file = xstrdup (name); current_source_start_addr = start_addr; current_source_end_addr = start_addr + size; } /* 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. */ static void coff_end_symtab (struct objfile *objfile) { struct symtab *symtab; last_source_start_addr = current_source_start_addr; symtab = end_symtab (current_source_end_addr, objfile, SECT_OFF_TEXT (objfile)); /* Reinitialize for beginning of new file. */ last_source_file = NULL; } static struct minimal_symbol * record_minimal_symbol (struct coff_symbol *cs, CORE_ADDR address, enum minimal_symbol_type type, int section, struct objfile *objfile) { struct bfd_section *bfd_section; /* We don't want TDESC entry points in the minimal symbol table */ if (cs->c_name[0] == '@') return NULL; bfd_section = cs_to_bfd_section (cs, objfile); return prim_record_minimal_symbol_and_info (cs->c_name, address, type, section, bfd_section, objfile); } /* coff_symfile_init () is the coff-specific initialization routine for reading symbols. It is passed a struct objfile which contains, among other things, the BFD for the file whose symbols are being read, and a slot for a pointer to "private data" which we fill with cookies and other treats for coff_symfile_read (). We will only be called if this is a COFF or COFF-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 coff_symfile_init (struct objfile *objfile) { /* Allocate struct to keep track of stab reading. */ objfile->deprecated_sym_stab_info = (struct dbx_symfile_info *) xmalloc (sizeof (struct dbx_symfile_info)); memset (objfile->deprecated_sym_stab_info, 0, sizeof (struct dbx_symfile_info)); /* Allocate struct to keep track of the symfile */ objfile->deprecated_sym_private = xmalloc (sizeof (struct coff_symfile_info)); memset (objfile->deprecated_sym_private, 0, sizeof (struct coff_symfile_info)); /* COFF objects may be reordered, so set OBJF_REORDERED. If we find this causes a significant slowdown in gdb then we could set it in the debug symbol readers only when necessary. */ objfile->flags |= OBJF_REORDERED; 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. */ static void find_linenos (bfd *abfd, struct bfd_section *asect, void *vpinfo) { struct coff_symfile_info *info; int size, count; file_ptr offset, maxoff; /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */ count = asect->lineno_count; /* End of warning */ if (count == 0) return; size = count * local_linesz; info = (struct coff_symfile_info *) vpinfo; /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */ offset = asect->line_filepos; /* End of warning */ if (offset < info->min_lineno_offset || info->min_lineno_offset == 0) info->min_lineno_offset = offset; maxoff = offset + size; if (maxoff > info->max_lineno_offset) info->max_lineno_offset = maxoff; } /* 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 coff_symfile_init. */ static void coff_symfile_read (struct objfile *objfile, int symfile_flags) { struct coff_symfile_info *info; struct dbx_symfile_info *dbxinfo; bfd *abfd = objfile->obfd; coff_data_type *cdata = coff_data (abfd); char *name = bfd_get_filename (abfd); int val; unsigned int num_symbols; int symtab_offset; int stringtab_offset; struct cleanup *back_to, *cleanup_minimal_symbols; int stabstrsize; int len; char * target; info = (struct coff_symfile_info *) objfile->deprecated_sym_private; dbxinfo = objfile->deprecated_sym_stab_info; symfile_bfd = abfd; /* Kludge for swap routines */ /* WARNING WILL ROBINSON! ACCESSING BFD-PRIVATE DATA HERE! FIXME! */ num_symbols = bfd_get_symcount (abfd); /* How many syms */ symtab_offset = cdata->sym_filepos; /* Symbol table file offset */ stringtab_offset = symtab_offset + /* String table file offset */ num_symbols * cdata->local_symesz; /* Set a few file-statics that give us specific information about the particular COFF file format we're reading. */ local_n_btmask = cdata->local_n_btmask; local_n_btshft = cdata->local_n_btshft; local_n_tmask = cdata->local_n_tmask; local_n_tshift = cdata->local_n_tshift; local_linesz = cdata->local_linesz; local_symesz = cdata->local_symesz; local_auxesz = cdata->local_auxesz; /* Allocate space for raw symbol and aux entries, based on their space requirements as reported by BFD. */ temp_sym = (char *) xmalloc (cdata->local_symesz + cdata->local_auxesz); temp_aux = temp_sym + cdata->local_symesz; back_to = make_cleanup (free_current_contents, &temp_sym); /* We need to know whether this is a PE file, because in PE files, unlike standard COFF files, symbol values are stored as offsets from the section address, rather than as absolute addresses. FIXME: We should use BFD to read the symbol table, and thus avoid this problem. */ pe_file = strncmp (bfd_get_target (objfile->obfd), "pe", 2) == 0 || strncmp (bfd_get_target (objfile->obfd), "epoc-pe", 7) == 0; /* End of warning */ info->min_lineno_offset = 0; info->max_lineno_offset = 0; /* Only read line number information if we have symbols. On Windows NT, some of the system's DLL's have sections with PointerToLinenumbers fields that are non-zero, but point at random places within the image file. (In the case I found, KERNEL32.DLL's .text section has a line number info pointer that points into the middle of the string `lib\\i386\kernel32.dll'.) However, these DLL's also have no symbols. The line number tables are meaningless without symbols. And in fact, GDB never uses the line number information unless there are symbols. So we can avoid spurious error messages (and maybe run a little faster!) by not even reading the line number table unless we have symbols. */ if (num_symbols > 0) { /* Read the line number table, all at once. */ bfd_map_over_sections (abfd, find_linenos, (void *) info); make_cleanup (free_linetab_cleanup, 0 /*ignore*/); val = init_lineno (abfd, info->min_lineno_offset, info->max_lineno_offset - info->min_lineno_offset); if (val < 0) error (_("\"%s\": error reading line numbers."), name); } /* Now read the string table, all at once. */ make_cleanup (free_stringtab_cleanup, 0 /*ignore*/); val = init_stringtab (abfd, stringtab_offset); if (val < 0) error (_("\"%s\": can't get string table"), name); init_minimal_symbol_collection (); cleanup_minimal_symbols = make_cleanup_discard_minimal_symbols (); /* Now that the executable file is positioned at symbol table, process it and define symbols accordingly. */ coff_symtab_read ((long) symtab_offset, num_symbols, objfile); /* Install any minimal symbols that have been collected as the current minimal symbols for this objfile. */ install_minimal_symbols (objfile); /* Free the installed minimal symbol data. */ do_cleanups (cleanup_minimal_symbols); bfd_map_over_sections (abfd, coff_locate_sections, (void *) info); if (info->stabsects) { if (!info->stabstrsect) { error (_("The debugging information in `%s' is corrupted.\n" "The file has a `.stabs' section, but no `.stabstr' section."), name); } /* FIXME: dubious. Why can't we use something normal like bfd_get_section_contents? */ bfd_seek (abfd, abfd->where, 0); stabstrsize = bfd_section_size (abfd, info->stabstrsect); coffstab_build_psymtabs (objfile, info->textaddr, info->textsize, info->stabsects, info->stabstrsect->filepos, stabstrsize); } if (dwarf2_has_info (objfile)) { /* DWARF2 sections. */ dwarf2_build_psymtabs (objfile); } dwarf2_build_frame_info (objfile); /* Try to add separate debug file if no symbols table found. */ if (!objfile_has_partial_symbols (objfile)) { char *debugfile; debugfile = find_separate_debug_file_by_debuglink (objfile); if (debugfile) { bfd *abfd = symfile_bfd_open (debugfile); symbol_file_add_separate (abfd, symfile_flags, objfile); xfree (debugfile); } } do_cleanups (back_to); } static void coff_new_init (struct objfile *ignore) { } /* 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 coff_symfile_finish (struct objfile *objfile) { if (objfile->deprecated_sym_private != NULL) { xfree (objfile->deprecated_sym_private); } /* Let stabs reader clean up */ stabsread_clear_cache (); dwarf2_free_objfile (objfile); } /* Given pointers to a symbol table in coff style exec file, analyze them and create struct symtab's describing the symbols. NSYMS is the number of symbols in the symbol table. We read them one at a time using read_one_sym (). */ static void coff_symtab_read (long symtab_offset, unsigned int nsyms, struct objfile *objfile) { struct gdbarch *gdbarch = get_objfile_arch (objfile); struct context_stack *new; struct coff_symbol coff_symbol; struct coff_symbol *cs = &coff_symbol; static struct internal_syment main_sym; static union internal_auxent main_aux; struct coff_symbol fcn_cs_saved; static struct internal_syment fcn_sym_saved; static union internal_auxent fcn_aux_saved; struct symtab *s; /* A .file is open. */ int in_source_file = 0; int next_file_symnum = -1; /* Name of the current file. */ char *filestring = ""; int depth = 0; int fcn_first_line = 0; CORE_ADDR fcn_first_line_addr = 0; int fcn_last_line = 0; int fcn_start_addr = 0; long fcn_line_ptr = 0; int val; CORE_ADDR tmpaddr; struct minimal_symbol *msym; /* Work around a stdio bug in SunOS4.1.1 (this makes me nervous.... it's hard to know I've really worked around it. The fix should be harmless, anyway). The symptom of the bug is that the first fread (in read_one_sym), will (in my example) actually get data from file offset 268, when the fseek was to 264 (and ftell shows 264). This causes all hell to break loose. I was unable to reproduce this on a short test program which operated on the same file, performing (I think) the same sequence of operations. It stopped happening when I put in this (former) rewind(). FIXME: Find out if this has been reported to Sun, whether it has been fixed in a later release, etc. */ bfd_seek (objfile->obfd, 0, 0); /* Position to read the symbol table. */ val = bfd_seek (objfile->obfd, (long) symtab_offset, 0); if (val < 0) perror_with_name (objfile->name); current_objfile = objfile; nlist_bfd_global = objfile->obfd; nlist_nsyms_global = nsyms; last_source_file = NULL; memset (opaque_type_chain, 0, sizeof opaque_type_chain); if (type_vector) /* Get rid of previous one */ xfree (type_vector); type_vector_length = 160; type_vector = (struct type **) xmalloc (type_vector_length * sizeof (struct type *)); memset (type_vector, 0, type_vector_length * sizeof (struct type *)); coff_start_symtab (""); symnum = 0; while (symnum < nsyms) { QUIT; /* Make this command interruptable. */ read_one_sym (cs, &main_sym, &main_aux); if (cs->c_symnum == next_file_symnum && cs->c_sclass != C_FILE) { if (last_source_file) coff_end_symtab (objfile); coff_start_symtab ("_globals_"); /* coff_start_symtab will set the language of this symtab to language_unknown, since such a ``file name'' is not recognized. Override that with the minimal language to allow printing values in this symtab. */ current_subfile->language = language_minimal; complete_symtab ("_globals_", 0, 0); /* done with all files, everything from here on out is globals */ } /* Special case for file with type declarations only, no text. */ if (!last_source_file && SDB_TYPE (cs->c_type) && cs->c_secnum == N_DEBUG) complete_symtab (filestring, 0, 0); /* Typedefs should not be treated as symbol definitions. */ if (ISFCN (cs->c_type) && cs->c_sclass != C_TPDEF) { /* Record all functions -- external and static -- in minsyms. */ int section = cs_to_section (cs, objfile); tmpaddr = cs->c_value + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); record_minimal_symbol (cs, tmpaddr, mst_text, section, objfile); fcn_line_ptr = main_aux.x_sym.x_fcnary.x_fcn.x_lnnoptr; fcn_start_addr = tmpaddr; fcn_cs_saved = *cs; fcn_sym_saved = main_sym; fcn_aux_saved = main_aux; continue; } switch (cs->c_sclass) { case C_EFCN: case C_EXTDEF: case C_ULABEL: case C_USTATIC: case C_LINE: case C_ALIAS: case C_HIDDEN: complaint (&symfile_complaints, _("Bad n_sclass for symbol %s"), cs->c_name); break; case C_FILE: /* c_value field contains symnum of next .file entry in table or symnum of first global after last .file. */ next_file_symnum = cs->c_value; if (cs->c_naux > 0) filestring = coff_getfilename (&main_aux); else filestring = ""; /* Complete symbol table for last object file containing debugging information. */ if (last_source_file) { coff_end_symtab (objfile); coff_start_symtab (filestring); } in_source_file = 1; break; /* C_LABEL is used for labels and static functions. Including it here allows gdb to see static functions when no debug info is available. */ case C_LABEL: /* However, labels within a function can make weird backtraces, so filter them out (from phdm@macqel.be). */ if (within_function) break; case C_STAT: case C_THUMBLABEL: case C_THUMBSTAT: case C_THUMBSTATFUNC: if (cs->c_name[0] == '.') { if (strcmp (cs->c_name, ".text") == 0) { /* FIXME: don't wire in ".text" as section name or symbol name! */ /* Check for in_source_file deals with case of a file with debugging symbols followed by a later file with no symbols. */ if (in_source_file) complete_symtab (filestring, cs->c_value + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)), main_aux.x_scn.x_scnlen); in_source_file = 0; } /* flush rest of '.' symbols */ break; } else if (!SDB_TYPE (cs->c_type) && cs->c_name[0] == 'L' && (strncmp (cs->c_name, "LI%", 3) == 0 || strncmp (cs->c_name, "LF%", 3) == 0 || strncmp (cs->c_name, "LC%", 3) == 0 || strncmp (cs->c_name, "LP%", 3) == 0 || strncmp (cs->c_name, "LPB%", 4) == 0 || strncmp (cs->c_name, "LBB%", 4) == 0 || strncmp (cs->c_name, "LBE%", 4) == 0 || strncmp (cs->c_name, "LPBX%", 5) == 0)) /* At least on a 3b1, gcc generates swbeg and string labels that look like this. Ignore them. */ break; /* fall in for static symbols that don't start with '.' */ case C_THUMBEXT: case C_THUMBEXTFUNC: case C_EXT: { /* Record it in the minimal symbols regardless of SDB_TYPE. This parallels what we do for other debug formats, and probably is needed to make print_address_symbolic work right without the (now gone) "set fast-symbolic-addr off" kludge. */ enum minimal_symbol_type ms_type; int sec; if (cs->c_secnum == N_UNDEF) { /* This is a common symbol. See if the target environment knows where it has been relocated to. */ CORE_ADDR reladdr; if (target_lookup_symbol (cs->c_name, &reladdr)) { /* Error in lookup; ignore symbol. */ break; } tmpaddr = reladdr; /* The address has already been relocated; make sure that objfile_relocate doesn't relocate it again. */ sec = -2; ms_type = cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT ? mst_bss : mst_file_bss; } else if (cs->c_secnum == N_ABS) { /* Use the correct minimal symbol type (and don't relocate) for absolute values. */ ms_type = mst_abs; sec = cs_to_section (cs, objfile); tmpaddr = cs->c_value; } else { asection *bfd_section = cs_to_bfd_section (cs, objfile); sec = cs_to_section (cs, objfile); tmpaddr = cs->c_value; /* Statics in a PE file also get relocated */ if (cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC || cs->c_sclass == C_THUMBEXT || (pe_file && (cs->c_sclass == C_STAT))) tmpaddr += ANOFFSET (objfile->section_offsets, sec); if (bfd_section->flags & SEC_CODE) { ms_type = cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC || cs->c_sclass == C_THUMBEXT ? mst_text : mst_file_text; tmpaddr = gdbarch_smash_text_address (gdbarch, tmpaddr); } else if (bfd_section->flags & SEC_ALLOC && bfd_section->flags & SEC_LOAD) { ms_type = cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT ? mst_data : mst_file_data; } else if (bfd_section->flags & SEC_ALLOC) { ms_type = cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT ? mst_bss : mst_file_bss; } else ms_type = mst_unknown; } msym = record_minimal_symbol (cs, tmpaddr, ms_type, sec, objfile); if (msym) gdbarch_coff_make_msymbol_special (gdbarch, cs->c_sclass, msym); if (SDB_TYPE (cs->c_type)) { struct symbol *sym; sym = process_coff_symbol (cs, &main_aux, objfile); SYMBOL_VALUE (sym) = tmpaddr; SYMBOL_SECTION (sym) = sec; } } break; case C_FCN: if (strcmp (cs->c_name, ".bf") == 0) { within_function = 1; /* value contains address of first non-init type code */ /* main_aux.x_sym.x_misc.x_lnsz.x_lnno contains line number of '{' } */ if (cs->c_naux != 1) complaint (&symfile_complaints, _("`.bf' symbol %d has no aux entry"), cs->c_symnum); fcn_first_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno; fcn_first_line_addr = cs->c_value; /* Might want to check that locals are 0 and context_stack_depth is zero, and complain if not. */ depth = 0; new = push_context (depth, fcn_start_addr); fcn_cs_saved.c_name = getsymname (&fcn_sym_saved); new->name = process_coff_symbol (&fcn_cs_saved, &fcn_aux_saved, objfile); } else if (strcmp (cs->c_name, ".ef") == 0) { if (!within_function) error (_("Bad coff function information.")); /* the value of .ef is the address of epilogue code; not useful for gdb. */ /* { main_aux.x_sym.x_misc.x_lnsz.x_lnno contains number of lines to '}' */ if (context_stack_depth <= 0) { /* We attempted to pop an empty context stack */ complaint (&symfile_complaints, _("`.ef' symbol without matching `.bf' symbol ignored starting at symnum %d"), cs->c_symnum); within_function = 0; break; } new = pop_context (); /* Stack must be empty now. */ if (context_stack_depth > 0 || new == NULL) { complaint (&symfile_complaints, _("Unmatched .ef symbol(s) ignored starting at symnum %d"), cs->c_symnum); within_function = 0; break; } if (cs->c_naux != 1) { complaint (&symfile_complaints, _("`.ef' symbol %d has no aux entry"), cs->c_symnum); fcn_last_line = 0x7FFFFFFF; } else { fcn_last_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno; } /* fcn_first_line is the line number of the opening '{'. Do not record it - because it would affect gdb's idea of the line number of the first statement of the function - except for one-line functions, for which it is also the line number of all the statements and of the closing '}', and for which we do not have any other statement-line-number. */ if (fcn_last_line == 1) record_line (current_subfile, fcn_first_line, gdbarch_addr_bits_remove (gdbarch, fcn_first_line_addr)); else enter_linenos (fcn_line_ptr, fcn_first_line, fcn_last_line, objfile); finish_block (new->name, &local_symbols, new->old_blocks, new->start_addr, fcn_cs_saved.c_value + fcn_aux_saved.x_sym.x_misc.x_fsize + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)), objfile ); within_function = 0; } break; case C_BLOCK: if (strcmp (cs->c_name, ".bb") == 0) { tmpaddr = cs->c_value; tmpaddr += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); push_context (++depth, tmpaddr); } else if (strcmp (cs->c_name, ".eb") == 0) { if (context_stack_depth <= 0) { /* We attempted to pop an empty context stack */ complaint (&symfile_complaints, _("`.eb' symbol without matching `.bb' symbol ignored starting at symnum %d"), cs->c_symnum); break; } new = pop_context (); if (depth-- != new->depth) { complaint (&symfile_complaints, _("Mismatched .eb symbol ignored starting at symnum %d"), symnum); break; } if (local_symbols && context_stack_depth > 0) { tmpaddr = cs->c_value + ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); /* Make a block for the local symbols within. */ finish_block (0, &local_symbols, new->old_blocks, new->start_addr, tmpaddr, objfile); } /* Now pop locals of block just finished. */ local_symbols = new->locals; } break; default: process_coff_symbol (cs, &main_aux, objfile); break; } } if ((nsyms == 0) && (pe_file)) { /* We've got no debugging symbols, but it's a portable executable, so try to read the export table */ read_pe_exported_syms (objfile); } if (last_source_file) coff_end_symtab (objfile); /* Patch up any opaque types (references to types that are not defined in the file where they are referenced, e.g. "struct foo *bar"). */ ALL_OBJFILE_SYMTABS (objfile, s) patch_opaque_types (s); current_objfile = NULL; } /* Routines for reading headers and symbols from executable. */ /* Read the next symbol, swap it, and return it in both internal_syment form, and coff_symbol form. Also return its first auxent, if any, in internal_auxent form, and skip any other auxents. */ static void read_one_sym (struct coff_symbol *cs, struct internal_syment *sym, union internal_auxent *aux) { int i; bfd_size_type bytes; cs->c_symnum = symnum; bytes = bfd_bread (temp_sym, local_symesz, nlist_bfd_global); if (bytes != local_symesz) error ("%s: error reading symbols", current_objfile->name); bfd_coff_swap_sym_in (symfile_bfd, temp_sym, (char *) sym); cs->c_naux = sym->n_numaux & 0xff; if (cs->c_naux >= 1) { bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global); if (bytes != local_auxesz) error ("%s: error reading symbols", current_objfile->name); bfd_coff_swap_aux_in (symfile_bfd, temp_aux, sym->n_type, sym->n_sclass, 0, cs->c_naux, (char *) aux); /* If more than one aux entry, read past it (only the first aux is important). */ for (i = 1; i < cs->c_naux; i++) { bytes = bfd_bread (temp_aux, local_auxesz, nlist_bfd_global); if (bytes != local_auxesz) error ("%s: error reading symbols", current_objfile->name); } } cs->c_name = getsymname (sym); cs->c_value = sym->n_value; cs->c_sclass = (sym->n_sclass & 0xff); cs->c_secnum = sym->n_scnum; cs->c_type = (unsigned) sym->n_type; if (!SDB_TYPE (cs->c_type)) cs->c_type = 0; #if 0 if (cs->c_sclass & 128) printf (_("thumb symbol %s, class 0x%x\n"), cs->c_name, cs->c_sclass); #endif symnum += 1 + cs->c_naux; /* The PE file format stores symbol values as offsets within the section, rather than as absolute addresses. We correct that here, if the symbol has an appropriate storage class. FIXME: We should use BFD to read the symbols, rather than duplicating the work here. */ if (pe_file) { switch (cs->c_sclass) { case C_EXT: case C_THUMBEXT: case C_THUMBEXTFUNC: case C_SECTION: case C_NT_WEAK: case C_STAT: case C_THUMBSTAT: case C_THUMBSTATFUNC: case C_LABEL: case C_THUMBLABEL: case C_BLOCK: case C_FCN: case C_EFCN: if (cs->c_secnum != 0) cs->c_value += cs_section_address (cs, symfile_bfd); break; } } } /* Support for string table handling */ static char *stringtab = NULL; static int init_stringtab (bfd *abfd, long offset) { long length; int val; unsigned char lengthbuf[4]; free_stringtab (); /* If the file is stripped, the offset might be zero, indicating no string table. Just return with `stringtab' set to null. */ if (offset == 0) return 0; if (bfd_seek (abfd, offset, 0) < 0) return -1; val = bfd_bread ((char *) lengthbuf, sizeof lengthbuf, abfd); length = bfd_h_get_32 (symfile_bfd, lengthbuf); /* If no string table is needed, then the file may end immediately after the symbols. Just return with `stringtab' set to null. */ if (val != sizeof lengthbuf || length < sizeof lengthbuf) return 0; stringtab = (char *) xmalloc (length); /* This is in target format (probably not very useful, and not currently used), not host format. */ memcpy (stringtab, lengthbuf, sizeof lengthbuf); if (length == sizeof length) /* Empty table -- just the count */ return 0; val = bfd_bread (stringtab + sizeof lengthbuf, length - sizeof lengthbuf, abfd); if (val != length - sizeof lengthbuf || stringtab[length - 1] != '\0') return -1; return 0; } static void free_stringtab (void) { if (stringtab) xfree (stringtab); stringtab = NULL; } static void free_stringtab_cleanup (void *ignore) { free_stringtab (); } static char * getsymname (struct internal_syment *symbol_entry) { static char buffer[SYMNMLEN + 1]; char *result; if (symbol_entry->_n._n_n._n_zeroes == 0) { /* FIXME: Probably should be detecting corrupt symbol files by seeing whether offset points to within the stringtab. */ result = stringtab + symbol_entry->_n._n_n._n_offset; } else { strncpy (buffer, symbol_entry->_n._n_name, SYMNMLEN); buffer[SYMNMLEN] = '\0'; result = buffer; } return result; } /* Extract the file name from the aux entry of a C_FILE symbol. Return only the last component of the name. Result is in static storage and is only good for temporary use. */ static char * coff_getfilename (union internal_auxent *aux_entry) { static char buffer[BUFSIZ]; char *temp; char *result; if (aux_entry->x_file.x_n.x_zeroes == 0) strcpy (buffer, stringtab + aux_entry->x_file.x_n.x_offset); else { strncpy (buffer, aux_entry->x_file.x_fname, FILNMLEN); buffer[FILNMLEN] = '\0'; } result = buffer; /* FIXME: We should not be throwing away the information about what directory. It should go into dirname of the symtab, or some such place. */ if ((temp = strrchr (result, '/')) != NULL) result = temp + 1; return (result); } /* 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_lineno (bfd *abfd, long offset, int size) { int val; linetab_offset = offset; linetab_size = size; free_linetab (); if (size == 0) return 0; if (bfd_seek (abfd, offset, 0) < 0) return -1; /* Allocate the desired table, plus a sentinel */ linetab = (char *) xmalloc (size + local_linesz); val = bfd_bread (linetab, size, abfd); if (val != size) return -1; /* Terminate it with an all-zero sentinel record */ memset (linetab + size, 0, local_linesz); return 0; } static void free_linetab (void) { if (linetab) xfree (linetab); linetab = NULL; } static void free_linetab_cleanup (void *ignore) { free_linetab (); } #if !defined (L_LNNO32) #define L_LNNO32(lp) ((lp)->l_lnno) #endif static void enter_linenos (long file_offset, int first_line, int last_line, struct objfile *objfile) { struct gdbarch *gdbarch = get_objfile_arch (objfile); char *rawptr; struct internal_lineno lptr; if (!linetab) return; if (file_offset < linetab_offset) { complaint (&symfile_complaints, _("Line number pointer %ld lower than start of line numbers"), file_offset); if (file_offset > linetab_size) /* Too big to be an offset? */ return; file_offset += linetab_offset; /* Try reading at that linetab offset */ } rawptr = &linetab[file_offset - linetab_offset]; /* skip first line entry for each function */ rawptr += local_linesz; /* line numbers start at one for the first line of the function */ first_line--; /* If the line number table is full (e.g. 64K lines in COFF debug info), the next function's L_LNNO32 might not be zero, so don't overstep the table's end in any case. */ while (rawptr <= &linetab[0] + linetab_size) { bfd_coff_swap_lineno_in (symfile_bfd, rawptr, &lptr); rawptr += local_linesz; /* The next function, or the sentinel, will have L_LNNO32 zero; we exit. */ if (L_LNNO32 (&lptr) && L_LNNO32 (&lptr) <= last_line) { CORE_ADDR addr = lptr.l_addr.l_paddr; addr += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); record_line (current_subfile, first_line + L_LNNO32 (&lptr), gdbarch_addr_bits_remove (gdbarch, addr)); } else break; } } static void patch_type (struct type *type, struct type *real_type) { struct type *target = TYPE_TARGET_TYPE (type); struct type *real_target = TYPE_TARGET_TYPE (real_type); int field_size = TYPE_NFIELDS (real_target) * sizeof (struct field); TYPE_LENGTH (target) = TYPE_LENGTH (real_target); TYPE_NFIELDS (target) = TYPE_NFIELDS (real_target); TYPE_FIELDS (target) = (struct field *) TYPE_ALLOC (target, field_size); memcpy (TYPE_FIELDS (target), TYPE_FIELDS (real_target), field_size); if (TYPE_NAME (real_target)) { if (TYPE_NAME (target)) xfree (TYPE_NAME (target)); TYPE_NAME (target) = concat (TYPE_NAME (real_target), (char *)NULL); } } /* Patch up all appropriate typedef symbols in the opaque_type_chains so that they can be used to print out opaque data structures properly. */ static void patch_opaque_types (struct symtab *s) { struct block *b; struct dict_iterator iter; struct symbol *real_sym; /* Go through the per-file symbols only */ b = BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), STATIC_BLOCK); ALL_BLOCK_SYMBOLS (b, iter, real_sym) { /* Find completed typedefs to use to fix opaque ones. Remove syms from the chain when their types are stored, but search the whole chain, as there may be several syms from different files with the same name. */ if (SYMBOL_CLASS (real_sym) == LOC_TYPEDEF && SYMBOL_DOMAIN (real_sym) == VAR_DOMAIN && TYPE_CODE (SYMBOL_TYPE (real_sym)) == TYPE_CODE_PTR && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (real_sym))) != 0) { char *name = SYMBOL_LINKAGE_NAME (real_sym); int hash = hashname (name); struct symbol *sym, *prev; prev = 0; for (sym = opaque_type_chain[hash]; sym;) { if (name[0] == SYMBOL_LINKAGE_NAME (sym)[0] && strcmp (name + 1, SYMBOL_LINKAGE_NAME (sym) + 1) == 0) { if (prev) { SYMBOL_VALUE_CHAIN (prev) = SYMBOL_VALUE_CHAIN (sym); } else { opaque_type_chain[hash] = SYMBOL_VALUE_CHAIN (sym); } patch_type (SYMBOL_TYPE (sym), SYMBOL_TYPE (real_sym)); if (prev) { sym = SYMBOL_VALUE_CHAIN (prev); } else { sym = opaque_type_chain[hash]; } } else { prev = sym; sym = SYMBOL_VALUE_CHAIN (sym); } } } } } static int coff_reg_to_regnum (struct symbol *sym, struct gdbarch *gdbarch) { return gdbarch_sdb_reg_to_regnum (gdbarch, SYMBOL_VALUE (sym)); } static const struct symbol_register_ops coff_register_funcs = { coff_reg_to_regnum }; static struct symbol * process_coff_symbol (struct coff_symbol *cs, union internal_auxent *aux, struct objfile *objfile) { struct symbol *sym = (struct symbol *) obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); char *name; memset (sym, 0, sizeof (struct symbol)); name = cs->c_name; name = EXTERNAL_NAME (name, objfile->obfd); SYMBOL_LANGUAGE (sym) = current_subfile->language; SYMBOL_SET_NAMES (sym, name, strlen (name), 1, objfile); /* default assumptions */ SYMBOL_VALUE (sym) = cs->c_value; SYMBOL_DOMAIN (sym) = VAR_DOMAIN; SYMBOL_SECTION (sym) = cs_to_section (cs, objfile); if (ISFCN (cs->c_type)) { SYMBOL_VALUE (sym) += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); SYMBOL_TYPE (sym) = lookup_function_type (decode_function_type (cs, cs->c_type, aux, objfile)); SYMBOL_CLASS (sym) = LOC_BLOCK; if (cs->c_sclass == C_STAT || cs->c_sclass == C_THUMBSTAT || cs->c_sclass == C_THUMBSTATFUNC) add_symbol_to_list (sym, &file_symbols); else if (cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT || cs->c_sclass == C_THUMBEXTFUNC) add_symbol_to_list (sym, &global_symbols); } else { SYMBOL_TYPE (sym) = decode_type (cs, cs->c_type, aux, objfile); switch (cs->c_sclass) { case C_NULL: break; case C_AUTO: SYMBOL_CLASS (sym) = LOC_LOCAL; add_symbol_to_list (sym, &local_symbols); break; case C_THUMBEXT: case C_THUMBEXTFUNC: case C_EXT: SYMBOL_CLASS (sym) = LOC_STATIC; SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value; SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); add_symbol_to_list (sym, &global_symbols); break; case C_THUMBSTAT: case C_THUMBSTATFUNC: case C_STAT: SYMBOL_CLASS (sym) = LOC_STATIC; SYMBOL_VALUE_ADDRESS (sym) = (CORE_ADDR) cs->c_value; SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); if (within_function) { /* Static symbol of local scope */ add_symbol_to_list (sym, &local_symbols); } else { /* Static symbol at top level of file */ add_symbol_to_list (sym, &file_symbols); } break; #ifdef C_GLBLREG /* AMD coff */ case C_GLBLREG: #endif case C_REG: SYMBOL_CLASS (sym) = LOC_REGISTER; SYMBOL_REGISTER_OPS (sym) = &coff_register_funcs; SYMBOL_VALUE (sym) = cs->c_value; add_symbol_to_list (sym, &local_symbols); break; case C_THUMBLABEL: case C_LABEL: break; case C_ARG: SYMBOL_CLASS (sym) = LOC_ARG; SYMBOL_IS_ARGUMENT (sym) = 1; add_symbol_to_list (sym, &local_symbols); break; case C_REGPARM: SYMBOL_CLASS (sym) = LOC_REGISTER; SYMBOL_REGISTER_OPS (sym) = &coff_register_funcs; SYMBOL_IS_ARGUMENT (sym) = 1; SYMBOL_VALUE (sym) = cs->c_value; add_symbol_to_list (sym, &local_symbols); break; case C_TPDEF: SYMBOL_CLASS (sym) = LOC_TYPEDEF; SYMBOL_DOMAIN (sym) = VAR_DOMAIN; /* If type has no name, give it one */ if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0) { if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR || TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_FUNC) { /* If we are giving a name to a type such as "pointer to foo" or "function returning foo", we better not set the TYPE_NAME. If the program contains "typedef char *caddr_t;", we don't want all variables of type char * to print as caddr_t. This is not just a consequence of GDB's type management; CC and GCC (at least through version 2.4) both output variables of either type char * or caddr_t with the type refering to the C_TPDEF symbol for caddr_t. If a future compiler cleans this up it GDB is not ready for it yet, but if it becomes ready we somehow need to disable this check (without breaking the PCC/GCC2.4 case). Sigh. Fortunately, this check seems not to be necessary for anything except pointers or functions. */ ; } else TYPE_NAME (SYMBOL_TYPE (sym)) = concat (SYMBOL_LINKAGE_NAME (sym), (char *)NULL); } /* Keep track of any type which points to empty structured type, so it can be filled from a definition from another file. A simple forward reference (TYPE_CODE_UNDEF) is not an empty structured type, though; the forward references work themselves out via the magic of coff_lookup_type. */ if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_PTR && TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym))) == 0 && TYPE_CODE (TYPE_TARGET_TYPE (SYMBOL_TYPE (sym))) != TYPE_CODE_UNDEF) { int i = hashname (SYMBOL_LINKAGE_NAME (sym)); SYMBOL_VALUE_CHAIN (sym) = opaque_type_chain[i]; opaque_type_chain[i] = sym; } add_symbol_to_list (sym, &file_symbols); break; case C_STRTAG: case C_UNTAG: case C_ENTAG: SYMBOL_CLASS (sym) = LOC_TYPEDEF; SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; /* Some compilers try to be helpful by inventing "fake" names for anonymous enums, structures, and unions, like "~0fake" or ".0fake". Thanks, but no thanks... */ if (TYPE_TAG_NAME (SYMBOL_TYPE (sym)) == 0) if (SYMBOL_LINKAGE_NAME (sym) != NULL && *SYMBOL_LINKAGE_NAME (sym) != '~' && *SYMBOL_LINKAGE_NAME (sym) != '.') TYPE_TAG_NAME (SYMBOL_TYPE (sym)) = concat (SYMBOL_LINKAGE_NAME (sym), (char *)NULL); add_symbol_to_list (sym, &file_symbols); break; default: break; } } return sym; } /* Decode a coff type specifier; return the type that is meant. */ static struct type * decode_type (struct coff_symbol *cs, unsigned int c_type, union internal_auxent *aux, struct objfile *objfile) { struct type *type = 0; unsigned int new_c_type; if (c_type & ~N_BTMASK) { new_c_type = DECREF (c_type); if (ISPTR (c_type)) { type = decode_type (cs, new_c_type, aux, objfile); type = lookup_pointer_type (type); } else if (ISFCN (c_type)) { type = decode_type (cs, new_c_type, aux, objfile); type = lookup_function_type (type); } else if (ISARY (c_type)) { int i, n; unsigned short *dim; struct type *base_type, *index_type, *range_type; /* Define an array type. */ /* auxent refers to array, not base type */ if (aux->x_sym.x_tagndx.l == 0) cs->c_naux = 0; /* shift the indices down */ dim = &aux->x_sym.x_fcnary.x_ary.x_dimen[0]; i = 1; n = dim[0]; for (i = 0; *dim && i < DIMNUM - 1; i++, dim++) *dim = *(dim + 1); *dim = 0; base_type = decode_type (cs, new_c_type, aux, objfile); index_type = objfile_type (objfile)->builtin_int; range_type = create_range_type ((struct type *) NULL, index_type, 0, n - 1); type = create_array_type ((struct type *) NULL, base_type, range_type); } return type; } /* Reference to existing type. This only occurs with the struct, union, and enum types. EPI a29k coff fakes us out by producing aux entries with a nonzero x_tagndx for definitions of structs, unions, and enums, so we have to check the c_sclass field. SCO 3.2v4 cc gets confused with pointers to pointers to defined structs, and generates negative x_tagndx fields. */ if (cs->c_naux > 0 && aux->x_sym.x_tagndx.l != 0) { if (cs->c_sclass != C_STRTAG && cs->c_sclass != C_UNTAG && cs->c_sclass != C_ENTAG && aux->x_sym.x_tagndx.l >= 0) { type = coff_alloc_type (aux->x_sym.x_tagndx.l); return type; } else { complaint (&symfile_complaints, _("Symbol table entry for %s has bad tagndx value"), cs->c_name); /* And fall through to decode_base_type... */ } } return decode_base_type (cs, BTYPE (c_type), aux, objfile); } /* Decode a coff type specifier for function definition; return the type that the function returns. */ static struct type * decode_function_type (struct coff_symbol *cs, unsigned int c_type, union internal_auxent *aux, struct objfile *objfile) { if (aux->x_sym.x_tagndx.l == 0) cs->c_naux = 0; /* auxent refers to function, not base type */ return decode_type (cs, DECREF (c_type), aux, objfile); } /* basic C types */ static struct type * decode_base_type (struct coff_symbol *cs, unsigned int c_type, union internal_auxent *aux, struct objfile *objfile) { struct gdbarch *gdbarch = get_objfile_arch (objfile); struct type *type; switch (c_type) { case T_NULL: /* shows up with "void (*foo)();" structure members */ return objfile_type (objfile)->builtin_void; #ifdef T_VOID case T_VOID: /* Intel 960 COFF has this symbol and meaning. */ return objfile_type (objfile)->builtin_void; #endif case T_CHAR: return objfile_type (objfile)->builtin_char; case T_SHORT: return objfile_type (objfile)->builtin_short; case T_INT: return objfile_type (objfile)->builtin_int; case T_LONG: if (cs->c_sclass == C_FIELD && aux->x_sym.x_misc.x_lnsz.x_size > gdbarch_long_bit (gdbarch)) return objfile_type (objfile)->builtin_long_long; else return objfile_type (objfile)->builtin_long; case T_FLOAT: return objfile_type (objfile)->builtin_float; case T_DOUBLE: return objfile_type (objfile)->builtin_double; case T_LNGDBL: return objfile_type (objfile)->builtin_long_double; case T_STRUCT: if (cs->c_naux != 1) { /* anonymous structure type */ type = coff_alloc_type (cs->c_symnum); TYPE_CODE (type) = TYPE_CODE_STRUCT; TYPE_NAME (type) = NULL; /* This used to set the tag to "<opaque>". But I think setting it to NULL is right, and the printing code can print it as "struct {...}". */ TYPE_TAG_NAME (type) = NULL; INIT_CPLUS_SPECIFIC (type); TYPE_LENGTH (type) = 0; TYPE_FIELDS (type) = 0; TYPE_NFIELDS (type) = 0; } else { type = coff_read_struct_type (cs->c_symnum, aux->x_sym.x_misc.x_lnsz.x_size, aux->x_sym.x_fcnary.x_fcn.x_endndx.l, objfile); } return type; case T_UNION: if (cs->c_naux != 1) { /* anonymous union type */ type = coff_alloc_type (cs->c_symnum); TYPE_NAME (type) = NULL; /* This used to set the tag to "<opaque>". But I think setting it to NULL is right, and the printing code can print it as "union {...}". */ TYPE_TAG_NAME (type) = NULL; INIT_CPLUS_SPECIFIC (type); TYPE_LENGTH (type) = 0; TYPE_FIELDS (type) = 0; TYPE_NFIELDS (type) = 0; } else { type = coff_read_struct_type (cs->c_symnum, aux->x_sym.x_misc.x_lnsz.x_size, aux->x_sym.x_fcnary.x_fcn.x_endndx.l, objfile); } TYPE_CODE (type) = TYPE_CODE_UNION; return type; case T_ENUM: if (cs->c_naux != 1) { /* anonymous enum type */ type = coff_alloc_type (cs->c_symnum); TYPE_CODE (type) = TYPE_CODE_ENUM; TYPE_NAME (type) = NULL; /* This used to set the tag to "<opaque>". But I think setting it to NULL is right, and the printing code can print it as "enum {...}". */ TYPE_TAG_NAME (type) = NULL; TYPE_LENGTH (type) = 0; TYPE_FIELDS (type) = 0; TYPE_NFIELDS (type) = 0; } else { type = coff_read_enum_type (cs->c_symnum, aux->x_sym.x_misc.x_lnsz.x_size, aux->x_sym.x_fcnary.x_fcn.x_endndx.l, objfile); } return type; case T_MOE: /* shouldn't show up here */ break; case T_UCHAR: return objfile_type (objfile)->builtin_unsigned_char; case T_USHORT: return objfile_type (objfile)->builtin_unsigned_short; case T_UINT: return objfile_type (objfile)->builtin_unsigned_int; case T_ULONG: if (cs->c_sclass == C_FIELD && aux->x_sym.x_misc.x_lnsz.x_size > gdbarch_long_bit (gdbarch)) return objfile_type (objfile)->builtin_unsigned_long_long; else return objfile_type (objfile)->builtin_unsigned_long; } complaint (&symfile_complaints, _("Unexpected type for symbol %s"), cs->c_name); return objfile_type (objfile)->builtin_void; } /* This page contains subroutines of read_type. */ /* Read the description of a structure (or union type) and return an object describing the type. */ static struct type * coff_read_struct_type (int index, int length, int lastsym, struct objfile *objfile) { struct nextfield { struct nextfield *next; struct field field; }; struct type *type; struct nextfield *list = 0; struct nextfield *new; int nfields = 0; int n; char *name; struct coff_symbol member_sym; struct coff_symbol *ms = &member_sym; struct internal_syment sub_sym; union internal_auxent sub_aux; int done = 0; type = coff_alloc_type (index); TYPE_CODE (type) = TYPE_CODE_STRUCT; INIT_CPLUS_SPECIFIC (type); TYPE_LENGTH (type) = length; while (!done && symnum < lastsym && symnum < nlist_nsyms_global) { read_one_sym (ms, &sub_sym, &sub_aux); name = ms->c_name; name = EXTERNAL_NAME (name, objfile->obfd); switch (ms->c_sclass) { case C_MOS: case C_MOU: /* Get space to record the next field's data. */ new = (struct nextfield *) alloca (sizeof (struct nextfield)); new->next = list; list = new; /* Save the data. */ list->field.name = obsavestring (name, strlen (name), &objfile->objfile_obstack); FIELD_TYPE (list->field) = decode_type (ms, ms->c_type, &sub_aux, objfile); SET_FIELD_BITPOS (list->field, 8 * ms->c_value); FIELD_BITSIZE (list->field) = 0; nfields++; break; case C_FIELD: /* Get space to record the next field's data. */ new = (struct nextfield *) alloca (sizeof (struct nextfield)); new->next = list; list = new; /* Save the data. */ list->field.name = obsavestring (name, strlen (name), &objfile->objfile_obstack); FIELD_TYPE (list->field) = decode_type (ms, ms->c_type, &sub_aux, objfile); SET_FIELD_BITPOS (list->field, ms->c_value); FIELD_BITSIZE (list->field) = sub_aux.x_sym.x_misc.x_lnsz.x_size; nfields++; break; case C_EOS: done = 1; break; } } /* Now create the vector of fields, and record how big it is. */ TYPE_NFIELDS (type) = nfields; TYPE_FIELDS (type) = (struct field *) TYPE_ALLOC (type, sizeof (struct field) * nfields); /* Copy the saved-up fields into the field vector. */ for (n = nfields; list; list = list->next) TYPE_FIELD (type, --n) = list->field; return type; } /* Read a definition of an enumeration type, and create and return a suitable type object. Also defines the symbols that represent the values of the type. */ static struct type * coff_read_enum_type (int index, int length, int lastsym, struct objfile *objfile) { struct gdbarch *gdbarch = get_objfile_arch (objfile); struct symbol *sym; struct type *type; int nsyms = 0; int done = 0; struct pending **symlist; struct coff_symbol member_sym; struct coff_symbol *ms = &member_sym; struct internal_syment sub_sym; union internal_auxent sub_aux; struct pending *osyms, *syms; int o_nsyms; int n; char *name; int unsigned_enum = 1; type = coff_alloc_type (index); if (within_function) symlist = &local_symbols; else symlist = &file_symbols; osyms = *symlist; o_nsyms = osyms ? osyms->nsyms : 0; while (!done && symnum < lastsym && symnum < nlist_nsyms_global) { read_one_sym (ms, &sub_sym, &sub_aux); name = ms->c_name; name = EXTERNAL_NAME (name, objfile->obfd); switch (ms->c_sclass) { case C_MOE: sym = (struct symbol *) obstack_alloc (&objfile->objfile_obstack, sizeof (struct symbol)); memset (sym, 0, sizeof (struct symbol)); SYMBOL_SET_LINKAGE_NAME (sym, obsavestring (name, strlen (name), &objfile->objfile_obstack)); SYMBOL_CLASS (sym) = LOC_CONST; SYMBOL_DOMAIN (sym) = VAR_DOMAIN; SYMBOL_VALUE (sym) = ms->c_value; add_symbol_to_list (sym, symlist); nsyms++; break; case C_EOS: /* Sometimes the linker (on 386/ix 2.0.2 at least) screws up the count of how many symbols to read. So stop on .eos. */ done = 1; break; } } /* Now fill in the fields of the type-structure. */ if (length > 0) TYPE_LENGTH (type) = length; else /* Assume ints. */ TYPE_LENGTH (type) = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT; TYPE_CODE (type) = TYPE_CODE_ENUM; TYPE_NFIELDS (type) = nsyms; TYPE_FIELDS (type) = (struct field *) TYPE_ALLOC (type, sizeof (struct field) * nsyms); /* Find the symbols for the values and put them into the type. The symbols can be found in the symlist that we put them on to cause them to be defined. osyms contains the old value of that symlist; everything up to there was defined by us. */ /* Note that we preserve the order of the enum constants, so that in something like "enum {FOO, LAST_THING=FOO}" we print FOO, not LAST_THING. */ for (syms = *symlist, n = 0; syms; syms = syms->next) { int j = 0; if (syms == osyms) j = o_nsyms; for (; j < syms->nsyms; j++, n++) { struct symbol *xsym = syms->symbol[j]; SYMBOL_TYPE (xsym) = type; TYPE_FIELD_NAME (type, n) = SYMBOL_LINKAGE_NAME (xsym); SET_FIELD_BITPOS (TYPE_FIELD (type, n), SYMBOL_VALUE (xsym)); if (SYMBOL_VALUE (xsym) < 0) unsigned_enum = 0; TYPE_FIELD_BITSIZE (type, n) = 0; } if (syms == osyms) break; } if (unsigned_enum) TYPE_UNSIGNED (type) = 1; return type; } /* Register our ability to parse symbols for coff BFD files. */ static struct sym_fns coff_sym_fns = { bfd_target_coff_flavour, coff_new_init, /* sym_new_init: init anything gbl to entire symtab */ coff_symfile_init, /* sym_init: read initial info, setup for sym_read() */ coff_symfile_read, /* sym_read: read a symbol file into symtab */ coff_symfile_finish, /* sym_finish: finished with file, cleanup */ default_symfile_offsets, /* sym_offsets: xlate external to internal form */ default_symfile_segments, /* sym_segments: Get segment information from a file. */ NULL, /* sym_read_linetable */ default_symfile_relocate, /* sym_relocate: Relocate a debug section. */ NULL /* next: pointer to next struct sym_fns */ }; void _initialize_coffread (void) { add_symtab_fns (&coff_sym_fns); }
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