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Diffstat (limited to 'gdb/coffread.c')
| -rw-r--r-- | gdb/coffread.c | 2255 |
1 files changed, 2255 insertions, 0 deletions
diff --git a/gdb/coffread.c b/gdb/coffread.c new file mode 100644 index 00000000000..340e77f84c0 --- /dev/null +++ b/gdb/coffread.c @@ -0,0 +1,2255 @@ +/* Read coff symbol tables and convert to internal format, for GDB. + Copyright 1987, 88, 89, 90, 91, 92, 93, 94, 96, 97, 1998 + 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 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 "demangle.h" +#include "breakpoint.h" + +#include "bfd.h" +#include "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 "symfile.h" +#include "objfiles.h" +#include "buildsym.h" +#include "gdb-stabs.h" +#include "stabsread.h" +#include "complaints.h" +#include "target.h" + +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)) + +/* Convert from an sdb register number to an internal gdb register number. + This should be defined in tm.h, if REGISTER_NAMES is not set up + to map one to one onto the sdb register numbers. */ + +#ifndef SDB_REG_TO_REGNUM +# define SDB_REG_TO_REGNUM(value) (value) +#endif + +/* 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; + +/* 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; + +/* 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]; + +/* Complaints about various problems in the file being read */ + +struct complaint ef_complaint = + {"Unmatched .ef symbol(s) ignored starting at symnum %d", 0, 0}; + +struct complaint ef_stack_complaint = + {"`.ef' symbol without matching `.bf' symbol ignored starting at symnum %d", 0, 0}; + +struct complaint eb_stack_complaint = + {"`.eb' symbol without matching `.bb' symbol ignored starting at symnum %d", 0, 0}; + +struct complaint bf_no_aux_complaint = + {"`.bf' symbol %d has no aux entry", 0, 0}; + +struct complaint ef_no_aux_complaint = + {"`.ef' symbol %d has no aux entry", 0, 0}; + +struct complaint lineno_complaint = + {"Line number pointer %d lower than start of line numbers", 0, 0}; + +struct complaint unexpected_type_complaint = + {"Unexpected type for symbol %s", 0, 0}; + +struct complaint bad_sclass_complaint = + {"Bad n_sclass for symbol %s", 0, 0}; + +struct complaint misordered_blocks_complaint = + {"Blocks out of order at address %x", 0, 0}; + +struct complaint tagndx_bad_complaint = + {"Symbol table entry for %s has bad tagndx value", 0, 0}; + +struct complaint eb_complaint = + {"Mismatched .eb symbol ignored starting at symnum %d", 0, 0}; + +/* 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; +}; + +static struct type *coff_read_struct_type PARAMS ((int, int, int)); + +static struct type *decode_base_type PARAMS ((struct coff_symbol *, + unsigned int, + union internal_auxent *)); + +static struct type *decode_type PARAMS ((struct coff_symbol *, unsigned int, + union internal_auxent *)); + +static struct type *decode_function_type PARAMS ((struct coff_symbol *, + unsigned int, + union internal_auxent *)); + +static struct type *coff_read_enum_type PARAMS ((int, int, int)); + +static struct symbol *process_coff_symbol PARAMS ((struct coff_symbol *, + union internal_auxent *, + struct section_offsets *, + struct objfile *)); + +static void patch_opaque_types PARAMS ((struct symtab *)); + +static void patch_type PARAMS ((struct type *, struct type *)); + +static void enter_linenos PARAMS ((long, int, int, struct section_offsets *)); + +static void free_linetab PARAMS ((void)); + +static int init_lineno PARAMS ((bfd *, long, int)); + +static char *getsymname PARAMS ((struct internal_syment *)); + +static char *coff_getfilename PARAMS ((union internal_auxent *)); + +static void free_stringtab PARAMS ((void)); + +static int init_stringtab PARAMS ((bfd *, long)); + +static void read_one_sym PARAMS ((struct coff_symbol *, + struct internal_syment *, + union internal_auxent *)); + +static void coff_symtab_read PARAMS ((long, int, struct section_offsets *, + struct objfile *)); + +static void find_linenos PARAMS ((bfd *, sec_ptr, PTR)); + +static void coff_symfile_init PARAMS ((struct objfile *)); + +static void coff_new_init PARAMS ((struct objfile *)); + +static void coff_symfile_read PARAMS ((struct objfile *, + struct section_offsets *, int)); + +static void coff_symfile_finish PARAMS ((struct objfile *)); + +static void record_minimal_symbol PARAMS ((char *, CORE_ADDR, + enum minimal_symbol_type, + struct objfile *)); + +static void coff_end_symtab PARAMS ((struct objfile *)); + +static void complete_symtab PARAMS ((char *, CORE_ADDR, unsigned int)); + +static void coff_start_symtab PARAMS ((char *)); + +static void coff_record_line PARAMS ((int, CORE_ADDR)); + +static struct type *coff_alloc_type PARAMS ((int)); + +static struct type **coff_lookup_type PARAMS ((int)); + +static void coff_locate_sections PARAMS ((bfd *, asection *, PTR)); + +/* 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 (abfd, sectp, csip) + bfd *abfd; + asection *sectp; + PTR csip; +{ + register struct coff_symfile_info *csi; + const char *name; + + csi = (struct coff_symfile_info *) csip; + name = bfd_get_section_name (abfd, sectp); + if (STREQ (name, ".text")) + { + 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 (STREQ (name, ".stabstr")) + { + 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 (free, n); + } + } +} + +/* Return the section_offsets* that CS points to. */ +static int cs_to_section PARAMS ((struct coff_symbol *, struct objfile *)); + +struct find_targ_sec_arg { + int targ_index; + asection **resultp; +}; + +static void find_targ_sec PARAMS ((bfd *, asection *, void *)); + +static void find_targ_sec (abfd, sect, obj) + bfd *abfd; + asection *sect; + PTR 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 section number (SECT_OFF_*) that CS points to. */ +static int +cs_to_section (cs, objfile) + struct coff_symbol *cs; + struct objfile *objfile; +{ + asection *sect = NULL; + struct find_targ_sec_arg args; + int off = SECT_OFF_TEXT; + + args.targ_index = cs->c_secnum; + args.resultp = § + bfd_map_over_sections (objfile->obfd, find_targ_sec, &args); + if (sect != NULL) + { + /* This is the section. Figure out what SECT_OFF_* code it is. */ + if (bfd_get_section_flags (abfd, sect) & SEC_CODE) + off = SECT_OFF_TEXT; + else if (bfd_get_section_flags (abfd, sect) & SEC_LOAD) + off = SECT_OFF_DATA; + else + off = SECT_OFF_BSS; + } + return off; +} + +/* Return the address of the section of a COFF symbol. */ + +static CORE_ADDR cs_section_address PARAMS ((struct coff_symbol *, bfd *)); + +static CORE_ADDR +cs_section_address (cs, abfd) + 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 (index) + register 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 (index) + int index; +{ + register struct type **type_addr = coff_lookup_type (index); + register 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; +} + +/* Record a line number entry for line LINE at address PC. + FIXME: Use record_line instead. */ + +static void +coff_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. + 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 (name) + 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. */ + savestring (name, strlen(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"); + + /* 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; +{ + if (last_source_file != NULL) + free (last_source_file); + last_source_file = savestring (name, strlen (name)); + current_source_start_addr = start_addr; + current_source_end_addr = start_addr + size; + + if (current_objfile -> ei.entry_point >= current_source_start_addr && + current_objfile -> ei.entry_point < current_source_end_addr) + { + current_objfile -> ei.entry_file_lowpc = current_source_start_addr; + current_objfile -> ei.entry_file_highpc = current_source_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. */ + +static void +coff_end_symtab (objfile) + struct objfile *objfile; +{ + struct symtab *symtab; + + last_source_start_addr = current_source_start_addr; + + /* For no good reason, this file stores the number of entries in a + separate variable instead of in line_vector->nitems. Fix it. */ + if (line_vector) + line_vector->nitems = line_vector_index; + + /* For COFF, we only have one subfile, so we can just look at + subfiles and not worry about there being other elements in the + chain. We fill in various fields now because we didn't know them + before (or because doing it now is simply an artifact of how this + file used to be written). */ + subfiles->line_vector = line_vector; + + symtab = end_symtab (current_source_end_addr, objfile, 0); + + if (symtab != NULL) + free_named_symtabs (symtab->filename); + + /* Reinitialize for beginning of new file. */ + line_vector = 0; + line_vector_length = -1; + last_source_file = NULL; +} + +static void +record_minimal_symbol (name, address, type, objfile) + char *name; + CORE_ADDR address; + enum minimal_symbol_type type; + struct objfile *objfile; +{ + /* We don't want TDESC entry points in the minimal symbol table */ + if (name[0] == '@') return; + + prim_record_minimal_symbol (name, address, type, 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 (objfile) + struct objfile *objfile; +{ + /* Allocate struct to keep track of stab reading. */ + objfile->sym_stab_info = (struct dbx_symfile_info *) + xmmalloc (objfile->md, sizeof (struct dbx_symfile_info)); + + memset ((PTR) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); + + /* Allocate struct to keep track of the symfile */ + objfile->sym_private = xmmalloc (objfile->md, + sizeof (struct coff_symfile_info)); + + memset (objfile->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. */ + +/* ARGSUSED */ +static void +find_linenos (abfd, asect, vpinfo) + bfd *abfd; + sec_ptr asect; + PTR 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. */ + +/* ARGSUSED */ +static void +coff_symfile_read (objfile, section_offsets, mainline) + struct objfile *objfile; + struct section_offsets *section_offsets; + int mainline; +{ + 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); + register int val; + int num_symbols; + int symtab_offset; + int stringtab_offset; + struct cleanup *back_to; + int stabstrsize; + + info = (struct coff_symfile_info *) objfile -> sym_private; + dbxinfo = objfile->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_linesz = cdata->local_linesz; + 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 ((make_cleanup_func) 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; + +/* End of warning */ + + /* Read the line number table, all at once. */ + info->min_lineno_offset = 0; + info->max_lineno_offset = 0; + bfd_map_over_sections (abfd, find_linenos, (PTR) info); + + make_cleanup ((make_cleanup_func) free_linetab, 0); + 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\n", name); + + /* Now read the string table, all at once. */ + + make_cleanup ((make_cleanup_func) free_stringtab, 0); + val = init_stringtab (abfd, stringtab_offset); + if (val < 0) + error ("\"%s\": can't get string table", name); + + init_minimal_symbol_collection (); + make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0); + + /* Now that the executable file is positioned at symbol table, + process it and define symbols accordingly. */ + + coff_symtab_read ((long) symtab_offset, num_symbols, section_offsets, + 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); + + bfd_map_over_sections (abfd, coff_locate_sections, (PTR) info); + + if (info->stabsects) + { + /* 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, + section_offsets, + mainline, + info->textaddr, info->textsize, + info->stabsects, + info->stabstrsect->filepos, stabstrsize); + } + + do_cleanups (back_to); +} + +static void +coff_new_init (ignore) + 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 (objfile) + struct objfile *objfile; +{ + if (objfile -> sym_private != NULL) + { + mfree (objfile -> md, objfile -> sym_private); + } +} + + +/* 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 (symtab_offset, nsyms, section_offsets, objfile) + long symtab_offset; + int nsyms; + struct section_offsets *section_offsets; + struct objfile *objfile; +{ + register struct context_stack *new; + struct coff_symbol coff_symbol; + register 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; + int fcn_last_line = 0; + int fcn_start_addr = 0; + long fcn_line_ptr = 0; + int val; + CORE_ADDR tmpaddr; + + /* 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 */ + free ((PTR) 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_"); + 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. */ + tmpaddr = cs->c_value + ANOFFSET (section_offsets, SECT_OFF_TEXT); + record_minimal_symbol (cs->c_name, tmpaddr, mst_text, 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: + complain (&bad_sclass_complaint, 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 (STREQ (cs->c_name, ".text")) { + /* 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 (section_offsets, SECT_OFF_TEXT), + 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. */ + + /* FIXME: should use mst_abs, and not relocate, if absolute. */ + 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 + { + sec = cs_to_section (cs, objfile); + tmpaddr = cs->c_value; + if (cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC + || cs->c_sclass == C_THUMBEXT) + tmpaddr += ANOFFSET (section_offsets, sec); + + switch (sec) + { + case SECT_OFF_TEXT: + case SECT_OFF_RODATA: + ms_type = + cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXTFUNC + || cs->c_sclass == C_THUMBEXT ? + mst_text : mst_file_text; +#ifdef SMASH_TEXT_ADDRESS + if (tmpaddr & 1) /* FIXME: delete this line */ + SMASH_TEXT_ADDRESS (tmpaddr); +#endif + break; + case SECT_OFF_DATA: + ms_type = + cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT ? + mst_data : mst_file_data; + break; + case SECT_OFF_BSS: + ms_type = + cs->c_sclass == C_EXT || cs->c_sclass == C_THUMBEXT ? + mst_data : mst_file_data; + break; + default: + ms_type = mst_unknown; + break; + } + } + + if (cs->c_name[0] != '@' /* Skip tdesc symbols */) + { + struct minimal_symbol *msym; + + msym = prim_record_minimal_symbol_and_info + (cs->c_name, tmpaddr, ms_type, (char *)cs->c_sclass, sec, + NULL, objfile); +#ifdef COFF_MAKE_MSYMBOL_SPECIAL + if(msym) + COFF_MAKE_MSYMBOL_SPECIAL(cs->c_sclass, msym); +#endif + } + if (SDB_TYPE (cs->c_type)) + { + struct symbol *sym; + sym = process_coff_symbol + (cs, &main_aux, section_offsets, objfile); + SYMBOL_VALUE (sym) = tmpaddr; + SYMBOL_SECTION (sym) = sec; + } + } + break; + + case C_FCN: + if (STREQ (cs->c_name, ".bf")) + { + 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) + complain (&bf_no_aux_complaint, cs->c_symnum); + fcn_first_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno; + + /* 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, + section_offsets, objfile); + } + else if (STREQ (cs->c_name, ".ef")) + { + /* 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 */ + complain (&ef_stack_complaint, cs->c_symnum); + within_function = 0; + break; + } + + new = pop_context (); + /* Stack must be empty now. */ + if (context_stack_depth > 0 || new == NULL) + { + complain (&ef_complaint, cs->c_symnum); + within_function = 0; + break; + } + if (cs->c_naux != 1) + { + complain (&ef_no_aux_complaint, cs->c_symnum); + fcn_last_line = 0x7FFFFFFF; + } + else + { + fcn_last_line = main_aux.x_sym.x_misc.x_lnsz.x_lnno; + } + enter_linenos (fcn_line_ptr, fcn_first_line, fcn_last_line, + section_offsets); + + finish_block (new->name, &local_symbols, new->old_blocks, + new->start_addr, +#if defined (FUNCTION_EPILOGUE_SIZE) + /* This macro should be defined only on + machines where the + fcn_aux_saved.x_sym.x_misc.x_fsize + field is always zero. + So use the .bf record information that + points to the epilogue and add the size + of the epilogue. */ + cs->c_value + + FUNCTION_EPILOGUE_SIZE + + ANOFFSET (section_offsets, SECT_OFF_TEXT), +#else + fcn_cs_saved.c_value + + fcn_aux_saved.x_sym.x_misc.x_fsize + + ANOFFSET (section_offsets, SECT_OFF_TEXT), +#endif + objfile + ); + within_function = 0; + } + break; + + case C_BLOCK: + if (STREQ (cs->c_name, ".bb")) + { + tmpaddr = cs->c_value; + tmpaddr += ANOFFSET (section_offsets, SECT_OFF_TEXT); + push_context (++depth, tmpaddr); + } + else if (STREQ (cs->c_name, ".eb")) + { + if (context_stack_depth <= 0) + { /* We attempted to pop an empty context stack */ + complain (&eb_stack_complaint, cs->c_symnum); + break; + } + + new = pop_context (); + if (depth-- != new->depth) + { + complain (&eb_complaint, symnum); + break; + } + if (local_symbols && context_stack_depth > 0) + { + tmpaddr = + cs->c_value + ANOFFSET (section_offsets, SECT_OFF_TEXT); + /* 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, section_offsets, objfile); + break; + } + } + + 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 (cs, sym, aux) + register struct coff_symbol *cs; + register struct internal_syment *sym; + register union internal_auxent *aux; +{ + int i; + + cs->c_symnum = symnum; + bfd_read (temp_sym, local_symesz, 1, nlist_bfd_global); + bfd_coff_swap_sym_in (symfile_bfd, temp_sym, (char *)sym); + cs->c_naux = sym->n_numaux & 0xff; + if (cs->c_naux >= 1) + { + bfd_read (temp_aux, local_auxesz, 1, nlist_bfd_global); + 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++) + bfd_read (temp_aux, local_auxesz, 1, nlist_bfd_global); + } + 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 (abfd, offset) + 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_read ((char *)lengthbuf, sizeof lengthbuf, 1, 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_read (stringtab + sizeof lengthbuf, length - sizeof lengthbuf, 1, abfd); + if (val != length - sizeof lengthbuf || stringtab[length - 1] != '\0') + return -1; + + return 0; +} + +static void +free_stringtab () +{ + if (stringtab) + free (stringtab); + stringtab = NULL; +} + +static char * +getsymname (symbol_entry) + 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 (aux_entry) + union internal_auxent *aux_entry; +{ + static char buffer[BUFSIZ]; + register 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 (abfd, offset, size) + 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_read (linetab, size, 1, 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 () +{ + if (linetab) + free (linetab); + linetab = NULL; +} + +#if !defined (L_LNNO32) +#define L_LNNO32(lp) ((lp)->l_lnno) +#endif + +static void +enter_linenos (file_offset, first_line, last_line, section_offsets) + long file_offset; + register int first_line; + register int last_line; + struct section_offsets *section_offsets; +{ + register char *rawptr; + struct internal_lineno lptr; + + if (!linetab) + return ; + if (file_offset < linetab_offset) + { + complain (&lineno_complaint, 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--; + + for (;;) { + 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) + coff_record_line (first_line + L_LNNO32 (&lptr), + lptr.l_addr.l_paddr + + ANOFFSET (section_offsets, SECT_OFF_TEXT)); + else + break; + } +} + +static void +patch_type (type, real_type) + struct type *type; + struct type *real_type; +{ + register struct type *target = TYPE_TARGET_TYPE (type); + register 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)) + free (TYPE_NAME (target)); + TYPE_NAME (target) = concat (TYPE_NAME (real_target), 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 (s) + struct symtab *s; +{ + register struct block *b; + register int i; + register struct symbol *real_sym; + + /* Go through the per-file symbols only */ + b = BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), STATIC_BLOCK); + for (i = BLOCK_NSYMS (b) - 1; i >= 0; i--) + { + /* 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. */ + real_sym = BLOCK_SYM (b, i); + if (SYMBOL_CLASS (real_sym) == LOC_TYPEDEF && + SYMBOL_NAMESPACE (real_sym) == VAR_NAMESPACE && + TYPE_CODE (SYMBOL_TYPE (real_sym)) == TYPE_CODE_PTR && + TYPE_LENGTH (TYPE_TARGET_TYPE (SYMBOL_TYPE (real_sym))) != 0) + { + register char *name = SYMBOL_NAME (real_sym); + register int hash = hashname (name); + register struct symbol *sym, *prev; + + prev = 0; + for (sym = opaque_type_chain[hash]; sym;) + { + if (name[0] == SYMBOL_NAME (sym)[0] && + STREQ (name + 1, SYMBOL_NAME (sym) + 1)) + { + 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 struct symbol * +process_coff_symbol (cs, aux, section_offsets, objfile) + register struct coff_symbol *cs; + register union internal_auxent *aux; + struct section_offsets *section_offsets; + struct objfile *objfile; +{ + register struct symbol *sym + = (struct symbol *) obstack_alloc (&objfile->symbol_obstack, + sizeof (struct symbol)); + char *name; + + memset (sym, 0, sizeof (struct symbol)); + name = cs->c_name; + name = EXTERNAL_NAME (name, objfile->obfd); + SYMBOL_NAME (sym) = obsavestring (name, strlen (name), + &objfile->symbol_obstack); + SYMBOL_LANGUAGE (sym) = language_auto; + SYMBOL_INIT_DEMANGLED_NAME (sym, &objfile->symbol_obstack); + + /* default assumptions */ + SYMBOL_VALUE (sym) = cs->c_value; + SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; + SYMBOL_SECTION (sym) = cs_to_section (cs, objfile); + + if (ISFCN (cs->c_type)) + { + SYMBOL_VALUE (sym) += ANOFFSET (section_offsets, SECT_OFF_TEXT); + SYMBOL_TYPE(sym) = + lookup_function_type (decode_function_type (cs, cs->c_type, aux)); + + 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); + 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 (section_offsets, SECT_OFF_TEXT); + 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 (section_offsets, SECT_OFF_TEXT); + 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_VALUE (sym) = SDB_REG_TO_REGNUM(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; + add_symbol_to_list (sym, &local_symbols); +#if !defined (BELIEVE_PCC_PROMOTION) + if (TARGET_BYTE_ORDER == BIG_ENDIAN) + { + /* If PCC says a parameter is a short or a char, + aligned on an int boundary, realign it to the + "little end" of the int. */ + struct type *temptype; + temptype = lookup_fundamental_type (current_objfile, + FT_INTEGER); + if (TYPE_LENGTH (SYMBOL_TYPE (sym)) < TYPE_LENGTH (temptype) + && TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_INT + && 0 == SYMBOL_VALUE (sym) % TYPE_LENGTH (temptype)) + { + SYMBOL_VALUE (sym) += + TYPE_LENGTH (temptype) + - TYPE_LENGTH (SYMBOL_TYPE (sym)); + } + } +#endif + break; + + case C_REGPARM: + SYMBOL_CLASS (sym) = LOC_REGPARM; + SYMBOL_VALUE (sym) = SDB_REG_TO_REGNUM(cs->c_value); + add_symbol_to_list (sym, &local_symbols); +#if !defined (BELIEVE_PCC_PROMOTION) + /* FIXME: This should retain the current type, since it's just + a register value. gnu@adobe, 26Feb93 */ + { + /* If PCC says a parameter is a short or a char, + it is really an int. */ + struct type *temptype; + temptype = + lookup_fundamental_type (current_objfile, FT_INTEGER); + if (TYPE_LENGTH (SYMBOL_TYPE (sym)) < TYPE_LENGTH (temptype) + && TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_INT) + { + SYMBOL_TYPE (sym) = + (TYPE_UNSIGNED (SYMBOL_TYPE (sym)) + ? lookup_fundamental_type (current_objfile, + FT_UNSIGNED_INTEGER) + : temptype); + } + } +#endif + break; + + case C_TPDEF: + SYMBOL_CLASS (sym) = LOC_TYPEDEF; + SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; + + /* 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_NAME (sym), NULL); + } +#ifdef CXUX_TARGET + /* Ignore vendor section for Harris CX/UX targets. */ + else if (cs->c_name[0] == '$') + break; +#endif /* CXUX_TARGET */ + + /* 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) + { + register int i = hashname (SYMBOL_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_NAMESPACE (sym) = STRUCT_NAMESPACE; + + /* 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_NAME(sym) != NULL + && *SYMBOL_NAME(sym) != '~' + && *SYMBOL_NAME(sym) != '.') + TYPE_TAG_NAME (SYMBOL_TYPE (sym)) = + concat (SYMBOL_NAME (sym), 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 (cs, c_type, aux) + register struct coff_symbol *cs; + unsigned int c_type; + register union internal_auxent *aux; +{ + register 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); + type = lookup_pointer_type (type); + } + else if (ISFCN (c_type)) + { + type = decode_type (cs, new_c_type, aux); + type = lookup_function_type (type); + } + else if (ISARY (c_type)) + { + int i, n; + register 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); + index_type = lookup_fundamental_type (current_objfile, FT_INTEGER); + 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 + { + complain (&tagndx_bad_complaint, cs->c_name); + /* And fall through to decode_base_type... */ + } + } + + return decode_base_type (cs, BTYPE (c_type), aux); +} + +/* Decode a coff type specifier for function definition; + return the type that the function returns. */ + +static struct type * +decode_function_type (cs, c_type, aux) + register struct coff_symbol *cs; + unsigned int c_type; + register union internal_auxent *aux; +{ + 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); +} + +/* basic C types */ + +static struct type * +decode_base_type (cs, c_type, aux) + register struct coff_symbol *cs; + unsigned int c_type; + register union internal_auxent *aux; +{ + struct type *type; + + switch (c_type) + { + case T_NULL: + /* shows up with "void (*foo)();" structure members */ + return lookup_fundamental_type (current_objfile, FT_VOID); + +#if 0 +/* DGUX actually defines both T_ARG and T_VOID to the same value. */ +#ifdef T_ARG + case T_ARG: + /* Shows up in DGUX, I think. Not sure where. */ + return lookup_fundamental_type (current_objfile, FT_VOID); /* shouldn't show up here */ +#endif +#endif /* 0 */ + +#ifdef T_VOID + case T_VOID: + /* Intel 960 COFF has this symbol and meaning. */ + return lookup_fundamental_type (current_objfile, FT_VOID); +#endif + + case T_CHAR: + return lookup_fundamental_type (current_objfile, FT_CHAR); + + case T_SHORT: + return lookup_fundamental_type (current_objfile, FT_SHORT); + + case T_INT: + return lookup_fundamental_type (current_objfile, FT_INTEGER); + + case T_LONG: + if (cs->c_sclass == C_FIELD + && aux->x_sym.x_misc.x_lnsz.x_size > TARGET_LONG_BIT) + return lookup_fundamental_type (current_objfile, FT_LONG_LONG); + else + return lookup_fundamental_type (current_objfile, FT_LONG); + + case T_FLOAT: + return lookup_fundamental_type (current_objfile, FT_FLOAT); + + case T_DOUBLE: + return lookup_fundamental_type (current_objfile, FT_DBL_PREC_FLOAT); + + case T_LNGDBL: + return lookup_fundamental_type (current_objfile, FT_EXT_PREC_FLOAT); + + 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); + } + 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); + } + 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); + } + return type; + + case T_MOE: + /* shouldn't show up here */ + break; + + case T_UCHAR: + return lookup_fundamental_type (current_objfile, FT_UNSIGNED_CHAR); + + case T_USHORT: + return lookup_fundamental_type (current_objfile, FT_UNSIGNED_SHORT); + + case T_UINT: + return lookup_fundamental_type (current_objfile, FT_UNSIGNED_INTEGER); + + case T_ULONG: + if (cs->c_sclass == C_FIELD + && aux->x_sym.x_misc.x_lnsz.x_size > TARGET_LONG_BIT) + return lookup_fundamental_type (current_objfile, FT_UNSIGNED_LONG_LONG); + else + return lookup_fundamental_type (current_objfile, FT_UNSIGNED_LONG); + } + complain (&unexpected_type_complaint, cs->c_name); + return lookup_fundamental_type (current_objfile, FT_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 (index, length, lastsym) + int index; + int length; + int lastsym; +{ + struct nextfield + { + struct nextfield *next; + struct field field; + }; + + register struct type *type; + register struct nextfield *list = 0; + struct nextfield *new; + int nfields = 0; + register int n; + char *name; + struct coff_symbol member_sym; + register 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, current_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), + ¤t_objfile->symbol_obstack); + FIELD_TYPE (list->field) = decode_type (ms, ms->c_type, &sub_aux); + 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), + ¤t_objfile->symbol_obstack); + FIELD_TYPE (list->field) = decode_type (ms, ms->c_type, &sub_aux); + 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. */ + +/* ARGSUSED */ +static struct type * +coff_read_enum_type (index, length, lastsym) + int index; + int length; + int lastsym; +{ + register struct symbol *sym; + register struct type *type; + int nsyms = 0; + int done = 0; + struct pending **symlist; + struct coff_symbol member_sym; + register struct coff_symbol *ms = &member_sym; + struct internal_syment sub_sym; + union internal_auxent sub_aux; + struct pending *osyms, *syms; + int o_nsyms; + register 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, current_objfile->obfd); + + switch (ms->c_sclass) + { + case C_MOE: + sym = (struct symbol *) obstack_alloc + (¤t_objfile->symbol_obstack, + sizeof (struct symbol)); + memset (sym, 0, sizeof (struct symbol)); + + SYMBOL_NAME (sym) = + obsavestring (name, strlen (name), + ¤t_objfile->symbol_obstack); + SYMBOL_CLASS (sym) = LOC_CONST; + SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE; + 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 + TYPE_LENGTH (type) = TARGET_INT_BIT / TARGET_CHAR_BIT; /* Assume ints */ + 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_NAME (xsym); + TYPE_FIELD_BITPOS (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_FLAGS (type) |= TYPE_FLAG_UNSIGNED; + + 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 */ + NULL /* next: pointer to next struct sym_fns */ +}; + +void +_initialize_coffread () +{ + add_symtab_fns (&coff_sym_fns); +} |