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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [buildsym.c] - Rev 830
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/* Support routines for building symbol tables in GDB's internal format. Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 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/>. */ /* This module provides subroutines used for creating and adding to the symbol table. These routines are called from various symbol- file-reading routines. Routines to support specific debugging information formats (stabs, DWARF, etc) belong somewhere else. */ #include "defs.h" #include "bfd.h" #include "gdb_obstack.h" #include "symtab.h" #include "symfile.h" #include "objfiles.h" #include "gdbtypes.h" #include "gdb_assert.h" #include "complaints.h" #include "gdb_string.h" #include "expression.h" /* For "enum exp_opcode" used by... */ #include "bcache.h" #include "filenames.h" /* For DOSish file names */ #include "macrotab.h" #include "demangle.h" /* Needed by SYMBOL_INIT_DEMANGLED_NAME. */ #include "block.h" #include "cp-support.h" #include "dictionary.h" #include "addrmap.h" /* Ask buildsym.h to define the vars it normally declares `extern'. */ #define EXTERN /**/ #include "buildsym.h" /* Our own declarations */ #undef EXTERN /* For cleanup_undefined_types and finish_global_stabs (somewhat questionable--see comment where we call them). */ #include "stabsread.h" /* List of subfiles. */ static struct subfile *subfiles; /* List of free `struct pending' structures for reuse. */ static struct pending *free_pendings; /* Non-zero if symtab has line number info. This prevents an otherwise empty symtab from being tossed. */ static int have_line_numbers; /* The mutable address map for the compilation unit whose symbols we're currently reading. The symtabs' shared blockvector will point to a fixed copy of this. */ static struct addrmap *pending_addrmap; /* The obstack on which we allocate pending_addrmap. If pending_addrmap is NULL, this is uninitialized; otherwise, it is initialized (and holds pending_addrmap). */ static struct obstack pending_addrmap_obstack; /* Non-zero if we recorded any ranges in the addrmap that are different from those in the blockvector already. We set this to zero when we start processing a symfile, and if it's still zero at the end, then we just toss the addrmap. */ static int pending_addrmap_interesting; static int compare_line_numbers (const void *ln1p, const void *ln2p); /* Initial sizes of data structures. These are realloc'd larger if needed, and realloc'd down to the size actually used, when completed. */ #define INITIAL_CONTEXT_STACK_SIZE 10 #define INITIAL_LINE_VECTOR_LENGTH 1000 /* maintain the lists of symbols and blocks */ /* Add a pending list to free_pendings. */ void add_free_pendings (struct pending *list) { struct pending *link = list; if (list) { while (link->next) link = link->next; link->next = free_pendings; free_pendings = list; } } /* Add a symbol to one of the lists of symbols. While we're at it, if we're in the C++ case and don't have full namespace debugging info, check to see if it references an anonymous namespace; if so, add an appropriate using directive. */ void add_symbol_to_list (struct symbol *symbol, struct pending **listhead) { struct pending *link; /* If this is an alias for another symbol, don't add it. */ if (symbol->ginfo.name && symbol->ginfo.name[0] == '#') return; /* We keep PENDINGSIZE symbols in each link of the list. If we don't have a link with room in it, add a new link. */ if (*listhead == NULL || (*listhead)->nsyms == PENDINGSIZE) { if (free_pendings) { link = free_pendings; free_pendings = link->next; } else { link = (struct pending *) xmalloc (sizeof (struct pending)); } link->next = *listhead; *listhead = link; link->nsyms = 0; } (*listhead)->symbol[(*listhead)->nsyms++] = symbol; } /* Find a symbol named NAME on a LIST. NAME need not be '\0'-terminated; LENGTH is the length of the name. */ struct symbol * find_symbol_in_list (struct pending *list, char *name, int length) { int j; char *pp; while (list != NULL) { for (j = list->nsyms; --j >= 0;) { pp = SYMBOL_LINKAGE_NAME (list->symbol[j]); if (*pp == *name && strncmp (pp, name, length) == 0 && pp[length] == '\0') { return (list->symbol[j]); } } list = list->next; } return (NULL); } /* At end of reading syms, or in case of quit, really free as many `struct pending's as we can easily find. */ void really_free_pendings (void *dummy) { struct pending *next, *next1; for (next = free_pendings; next; next = next1) { next1 = next->next; xfree ((void *) next); } free_pendings = NULL; free_pending_blocks (); for (next = file_symbols; next != NULL; next = next1) { next1 = next->next; xfree ((void *) next); } file_symbols = NULL; for (next = global_symbols; next != NULL; next = next1) { next1 = next->next; xfree ((void *) next); } global_symbols = NULL; if (pending_macros) free_macro_table (pending_macros); if (pending_addrmap) { obstack_free (&pending_addrmap_obstack, NULL); pending_addrmap = NULL; } } /* This function is called to discard any pending blocks. */ void free_pending_blocks (void) { /* The links are made in the objfile_obstack, so we only need to reset PENDING_BLOCKS. */ pending_blocks = NULL; } /* Take one of the lists of symbols and make a block from it. Keep the order the symbols have in the list (reversed from the input file). Put the block on the list of pending blocks. */ struct block * finish_block (struct symbol *symbol, struct pending **listhead, struct pending_block *old_blocks, CORE_ADDR start, CORE_ADDR end, struct objfile *objfile) { struct gdbarch *gdbarch = get_objfile_arch (objfile); struct pending *next, *next1; struct block *block; struct pending_block *pblock; struct pending_block *opblock; block = allocate_block (&objfile->objfile_obstack); if (symbol) { BLOCK_DICT (block) = dict_create_linear (&objfile->objfile_obstack, *listhead); } else { BLOCK_DICT (block) = dict_create_hashed (&objfile->objfile_obstack, *listhead); } BLOCK_START (block) = start; BLOCK_END (block) = end; /* Superblock filled in when containing block is made */ BLOCK_SUPERBLOCK (block) = NULL; BLOCK_NAMESPACE (block) = NULL; /* Put the block in as the value of the symbol that names it. */ if (symbol) { struct type *ftype = SYMBOL_TYPE (symbol); struct dict_iterator iter; SYMBOL_BLOCK_VALUE (symbol) = block; BLOCK_FUNCTION (block) = symbol; if (TYPE_NFIELDS (ftype) <= 0) { /* No parameter type information is recorded with the function's type. Set that from the type of the parameter symbols. */ int nparams = 0, iparams; struct symbol *sym; ALL_BLOCK_SYMBOLS (block, iter, sym) { if (SYMBOL_IS_ARGUMENT (sym)) nparams++; } if (nparams > 0) { TYPE_NFIELDS (ftype) = nparams; TYPE_FIELDS (ftype) = (struct field *) TYPE_ALLOC (ftype, nparams * sizeof (struct field)); iparams = 0; ALL_BLOCK_SYMBOLS (block, iter, sym) { if (iparams == nparams) break; if (SYMBOL_IS_ARGUMENT (sym)) { TYPE_FIELD_TYPE (ftype, iparams) = SYMBOL_TYPE (sym); TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0; iparams++; } } } } } else { BLOCK_FUNCTION (block) = NULL; } /* Now "free" the links of the list, and empty the list. */ for (next = *listhead; next; next = next1) { next1 = next->next; next->next = free_pendings; free_pendings = next; } *listhead = NULL; /* Check to be sure that the blocks have an end address that is greater than starting address */ if (BLOCK_END (block) < BLOCK_START (block)) { if (symbol) { complaint (&symfile_complaints, _("block end address less than block start address in %s (patched it)"), SYMBOL_PRINT_NAME (symbol)); } else { complaint (&symfile_complaints, _("block end address %s less than block start address %s (patched it)"), paddress (gdbarch, BLOCK_END (block)), paddress (gdbarch, BLOCK_START (block))); } /* Better than nothing */ BLOCK_END (block) = BLOCK_START (block); } /* Install this block as the superblock of all blocks made since the start of this scope that don't have superblocks yet. */ opblock = NULL; for (pblock = pending_blocks; pblock && pblock != old_blocks; pblock = pblock->next) { if (BLOCK_SUPERBLOCK (pblock->block) == NULL) { /* Check to be sure the blocks are nested as we receive them. If the compiler/assembler/linker work, this just burns a small amount of time. Skip blocks which correspond to a function; they're not physically nested inside this other blocks, only lexically nested. */ if (BLOCK_FUNCTION (pblock->block) == NULL && (BLOCK_START (pblock->block) < BLOCK_START (block) || BLOCK_END (pblock->block) > BLOCK_END (block))) { if (symbol) { complaint (&symfile_complaints, _("inner block not inside outer block in %s"), SYMBOL_PRINT_NAME (symbol)); } else { complaint (&symfile_complaints, _("inner block (%s-%s) not inside outer block (%s-%s)"), paddress (gdbarch, BLOCK_START (pblock->block)), paddress (gdbarch, BLOCK_END (pblock->block)), paddress (gdbarch, BLOCK_START (block)), paddress (gdbarch, BLOCK_END (block))); } if (BLOCK_START (pblock->block) < BLOCK_START (block)) BLOCK_START (pblock->block) = BLOCK_START (block); if (BLOCK_END (pblock->block) > BLOCK_END (block)) BLOCK_END (pblock->block) = BLOCK_END (block); } BLOCK_SUPERBLOCK (pblock->block) = block; } opblock = pblock; } block_set_using (block, using_directives, &objfile->objfile_obstack); record_pending_block (objfile, block, opblock); return block; } /* Record BLOCK on the list of all blocks in the file. Put it after OPBLOCK, or at the beginning if opblock is NULL. This puts the block in the list after all its subblocks. Allocate the pending block struct in the objfile_obstack to save time. This wastes a little space. FIXME: Is it worth it? */ void record_pending_block (struct objfile *objfile, struct block *block, struct pending_block *opblock) { struct pending_block *pblock; pblock = (struct pending_block *) obstack_alloc (&objfile->objfile_obstack, sizeof (struct pending_block)); pblock->block = block; if (opblock) { pblock->next = opblock->next; opblock->next = pblock; } else { pblock->next = pending_blocks; pending_blocks = pblock; } } /* Record that the range of addresses from START to END_INCLUSIVE (inclusive, like it says) belongs to BLOCK. BLOCK's start and end addresses must be set already. You must apply this function to all BLOCK's children before applying it to BLOCK. If a call to this function complicates the picture beyond that already provided by BLOCK_START and BLOCK_END, then we create an address map for the block. */ void record_block_range (struct block *block, CORE_ADDR start, CORE_ADDR end_inclusive) { /* If this is any different from the range recorded in the block's own BLOCK_START and BLOCK_END, then note that the address map has become interesting. Note that even if this block doesn't have any "interesting" ranges, some later block might, so we still need to record this block in the addrmap. */ if (start != BLOCK_START (block) || end_inclusive + 1 != BLOCK_END (block)) pending_addrmap_interesting = 1; if (! pending_addrmap) { obstack_init (&pending_addrmap_obstack); pending_addrmap = addrmap_create_mutable (&pending_addrmap_obstack); } addrmap_set_empty (pending_addrmap, start, end_inclusive, block); } static struct blockvector * make_blockvector (struct objfile *objfile) { struct pending_block *next; struct blockvector *blockvector; int i; /* Count the length of the list of blocks. */ for (next = pending_blocks, i = 0; next; next = next->next, i++) {; } blockvector = (struct blockvector *) obstack_alloc (&objfile->objfile_obstack, (sizeof (struct blockvector) + (i - 1) * sizeof (struct block *))); /* Copy the blocks into the blockvector. This is done in reverse order, which happens to put the blocks into the proper order (ascending starting address). finish_block has hair to insert each block into the list after its subblocks in order to make sure this is true. */ BLOCKVECTOR_NBLOCKS (blockvector) = i; for (next = pending_blocks; next; next = next->next) { BLOCKVECTOR_BLOCK (blockvector, --i) = next->block; } free_pending_blocks (); /* If we needed an address map for this symtab, record it in the blockvector. */ if (pending_addrmap && pending_addrmap_interesting) BLOCKVECTOR_MAP (blockvector) = addrmap_create_fixed (pending_addrmap, &objfile->objfile_obstack); else BLOCKVECTOR_MAP (blockvector) = 0; /* Some compilers output blocks in the wrong order, but we depend on their being in the right order so we can binary search. Check the order and moan about it. */ if (BLOCKVECTOR_NBLOCKS (blockvector) > 1) { for (i = 1; i < BLOCKVECTOR_NBLOCKS (blockvector); i++) { if (BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i - 1)) > BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i))) { CORE_ADDR start = BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i)); complaint (&symfile_complaints, _("block at %s out of order"), hex_string ((LONGEST) start)); } } } return (blockvector); } /* Start recording information about source code that came from an included (or otherwise merged-in) source file with a different name. NAME is the name of the file (cannot be NULL), DIRNAME is the directory in which the file was compiled (or NULL if not known). */ void start_subfile (char *name, char *dirname) { struct subfile *subfile; /* See if this subfile is already known as a subfile of the current main source file. */ for (subfile = subfiles; subfile; subfile = subfile->next) { char *subfile_name; /* If NAME is an absolute path, and this subfile is not, then attempt to create an absolute path to compare. */ if (IS_ABSOLUTE_PATH (name) && !IS_ABSOLUTE_PATH (subfile->name) && subfile->dirname != NULL) subfile_name = concat (subfile->dirname, SLASH_STRING, subfile->name, (char *) NULL); else subfile_name = subfile->name; if (FILENAME_CMP (subfile_name, name) == 0) { current_subfile = subfile; if (subfile_name != subfile->name) xfree (subfile_name); return; } if (subfile_name != subfile->name) xfree (subfile_name); } /* This subfile is not known. Add an entry for it. Make an entry for this subfile in the list of all subfiles of the current main source file. */ subfile = (struct subfile *) xmalloc (sizeof (struct subfile)); memset ((char *) subfile, 0, sizeof (struct subfile)); subfile->next = subfiles; subfiles = subfile; current_subfile = subfile; /* Save its name and compilation directory name */ subfile->name = (name == NULL) ? NULL : xstrdup (name); subfile->dirname = (dirname == NULL) ? NULL : xstrdup (dirname); /* Initialize line-number recording for this subfile. */ subfile->line_vector = NULL; /* Default the source language to whatever can be deduced from the filename. If nothing can be deduced (such as for a C/C++ include file with a ".h" extension), then inherit whatever language the previous subfile had. This kludgery is necessary because there is no standard way in some object formats to record the source language. Also, when symtabs are allocated we try to deduce a language then as well, but it is too late for us to use that information while reading symbols, since symtabs aren't allocated until after all the symbols have been processed for a given source file. */ subfile->language = deduce_language_from_filename (subfile->name); if (subfile->language == language_unknown && subfile->next != NULL) { subfile->language = subfile->next->language; } /* Initialize the debug format string to NULL. We may supply it later via a call to record_debugformat. */ subfile->debugformat = NULL; /* Similarly for the producer. */ subfile->producer = NULL; /* If the filename of this subfile ends in .C, then change the language of any pending subfiles from C to C++. We also accept any other C++ suffixes accepted by deduce_language_from_filename. */ /* Likewise for f2c. */ if (subfile->name) { struct subfile *s; enum language sublang = deduce_language_from_filename (subfile->name); if (sublang == language_cplus || sublang == language_fortran) for (s = subfiles; s != NULL; s = s->next) if (s->language == language_c) s->language = sublang; } /* And patch up this file if necessary. */ if (subfile->language == language_c && subfile->next != NULL && (subfile->next->language == language_cplus || subfile->next->language == language_fortran)) { subfile->language = subfile->next->language; } } /* For stabs readers, the first N_SO symbol is assumed to be the source file name, and the subfile struct is initialized using that assumption. If another N_SO symbol is later seen, immediately following the first one, then the first one is assumed to be the directory name and the second one is really the source file name. So we have to patch up the subfile struct by moving the old name value to dirname and remembering the new name. Some sanity checking is performed to ensure that the state of the subfile struct is reasonable and that the old name we are assuming to be a directory name actually is (by checking for a trailing '/'). */ void patch_subfile_names (struct subfile *subfile, char *name) { if (subfile != NULL && subfile->dirname == NULL && subfile->name != NULL && subfile->name[strlen (subfile->name) - 1] == '/') { subfile->dirname = subfile->name; subfile->name = xstrdup (name); last_source_file = name; /* Default the source language to whatever can be deduced from the filename. If nothing can be deduced (such as for a C/C++ include file with a ".h" extension), then inherit whatever language the previous subfile had. This kludgery is necessary because there is no standard way in some object formats to record the source language. Also, when symtabs are allocated we try to deduce a language then as well, but it is too late for us to use that information while reading symbols, since symtabs aren't allocated until after all the symbols have been processed for a given source file. */ subfile->language = deduce_language_from_filename (subfile->name); if (subfile->language == language_unknown && subfile->next != NULL) { subfile->language = subfile->next->language; } } } /* Handle the N_BINCL and N_EINCL symbol types that act like N_SOL for switching source files (different subfiles, as we call them) within one object file, but using a stack rather than in an arbitrary order. */ void push_subfile (void) { struct subfile_stack *tem = (struct subfile_stack *) xmalloc (sizeof (struct subfile_stack)); tem->next = subfile_stack; subfile_stack = tem; if (current_subfile == NULL || current_subfile->name == NULL) { internal_error (__FILE__, __LINE__, _("failed internal consistency check")); } tem->name = current_subfile->name; } char * pop_subfile (void) { char *name; struct subfile_stack *link = subfile_stack; if (link == NULL) { internal_error (__FILE__, __LINE__, _("failed internal consistency check")); } name = link->name; subfile_stack = link->next; xfree ((void *) link); return (name); } /* Add a linetable entry for line number LINE and address PC to the line vector for SUBFILE. */ void record_line (struct subfile *subfile, int line, CORE_ADDR pc) { struct linetable_entry *e; /* Ignore the dummy line number in libg.o */ if (line == 0xffff) { return; } /* Make sure line vector exists and is big enough. */ if (!subfile->line_vector) { subfile->line_vector_length = INITIAL_LINE_VECTOR_LENGTH; subfile->line_vector = (struct linetable *) xmalloc (sizeof (struct linetable) + subfile->line_vector_length * sizeof (struct linetable_entry)); subfile->line_vector->nitems = 0; have_line_numbers = 1; } if (subfile->line_vector->nitems + 1 >= subfile->line_vector_length) { subfile->line_vector_length *= 2; subfile->line_vector = (struct linetable *) xrealloc ((char *) subfile->line_vector, (sizeof (struct linetable) + (subfile->line_vector_length * sizeof (struct linetable_entry)))); } /* Normally, we treat lines as unsorted. But the end of sequence marker is special. We sort line markers at the same PC by line number, so end of sequence markers (which have line == 0) appear first. This is right if the marker ends the previous function, and there is no padding before the next function. But it is wrong if the previous line was empty and we are now marking a switch to a different subfile. We must leave the end of sequence marker at the end of this group of lines, not sort the empty line to after the marker. The easiest way to accomplish this is to delete any empty lines from our table, if they are followed by end of sequence markers. All we lose is the ability to set breakpoints at some lines which contain no instructions anyway. */ if (line == 0 && subfile->line_vector->nitems > 0) { e = subfile->line_vector->item + subfile->line_vector->nitems - 1; while (subfile->line_vector->nitems > 0 && e->pc == pc) { e--; subfile->line_vector->nitems--; } } e = subfile->line_vector->item + subfile->line_vector->nitems++; e->line = line; e->pc = pc; } /* Needed in order to sort line tables from IBM xcoff files. Sigh! */ static int compare_line_numbers (const void *ln1p, const void *ln2p) { struct linetable_entry *ln1 = (struct linetable_entry *) ln1p; struct linetable_entry *ln2 = (struct linetable_entry *) ln2p; /* Note: this code does not assume that CORE_ADDRs can fit in ints. Please keep it that way. */ if (ln1->pc < ln2->pc) return -1; if (ln1->pc > ln2->pc) return 1; /* If pc equal, sort by line. I'm not sure whether this is optimum behavior (see comment at struct linetable in symtab.h). */ return ln1->line - ln2->line; } /* Start a new symtab for a new source file. Called, for example, when a stabs symbol of type N_SO is seen, or when a DWARF TAG_compile_unit DIE is seen. It indicates the start of data for one original source file. NAME is the name of the file (cannot be NULL). DIRNAME is the directory in which the file was compiled (or NULL if not known). START_ADDR is the lowest address of objects in the file (or 0 if not known). */ void start_symtab (char *name, char *dirname, CORE_ADDR start_addr) { last_source_file = name; last_source_start_addr = start_addr; file_symbols = NULL; global_symbols = NULL; within_function = 0; have_line_numbers = 0; /* Context stack is initially empty. Allocate first one with room for 10 levels; reuse it forever afterward. */ if (context_stack == NULL) { context_stack_size = INITIAL_CONTEXT_STACK_SIZE; context_stack = (struct context_stack *) xmalloc (context_stack_size * sizeof (struct context_stack)); } context_stack_depth = 0; /* We shouldn't have any address map at this point. */ gdb_assert (! pending_addrmap); /* Initialize the list of sub source files with one entry for this file (the top-level source file). */ subfiles = NULL; current_subfile = NULL; start_subfile (name, dirname); } /* Subroutine of end_symtab to simplify it. Look for a subfile that matches the main source file's basename. If there is only one, and if the main source file doesn't have any symbol or line number information, then copy this file's symtab and line_vector to the main source file's subfile and discard the other subfile. This can happen because of a compiler bug or from the user playing games with #line or from things like a distributed build system that manipulates the debug info. */ static void watch_main_source_file_lossage (void) { struct subfile *mainsub, *subfile; /* Find the main source file. This loop could be eliminated if start_symtab saved it for us. */ mainsub = NULL; for (subfile = subfiles; subfile; subfile = subfile->next) { /* The main subfile is guaranteed to be the last one. */ if (subfile->next == NULL) mainsub = subfile; } /* If the main source file doesn't have any line number or symbol info, look for an alias in another subfile. We have to watch for mainsub == NULL here. It's a quirk of end_symtab, it can return NULL so there may not be a main subfile. */ if (mainsub && mainsub->line_vector == NULL && mainsub->symtab == NULL) { const char *mainbase = lbasename (mainsub->name); int nr_matches = 0; struct subfile *prevsub; struct subfile *mainsub_alias = NULL; struct subfile *prev_mainsub_alias = NULL; prevsub = NULL; for (subfile = subfiles; /* Stop before we get to the last one. */ subfile->next; subfile = subfile->next) { if (strcmp (lbasename (subfile->name), mainbase) == 0) { ++nr_matches; mainsub_alias = subfile; prev_mainsub_alias = prevsub; } prevsub = subfile; } if (nr_matches == 1) { gdb_assert (mainsub_alias != NULL && mainsub_alias != mainsub); /* Found a match for the main source file. Copy its line_vector and symtab to the main subfile and then discard it. */ mainsub->line_vector = mainsub_alias->line_vector; mainsub->line_vector_length = mainsub_alias->line_vector_length; mainsub->symtab = mainsub_alias->symtab; if (prev_mainsub_alias == NULL) subfiles = mainsub_alias->next; else prev_mainsub_alias->next = mainsub_alias->next; xfree (mainsub_alias); } } } /* Helper function for qsort. Parametes are `struct block *' pointers, function sorts them in descending order by their BLOCK_START. */ static int block_compar (const void *ap, const void *bp) { const struct block *a = *(const struct block **) ap; const struct block *b = *(const struct block **) bp; return ((BLOCK_START (b) > BLOCK_START (a)) - (BLOCK_START (b) < BLOCK_START (a))); } /* 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. END_ADDR is the address of the end of the file's text. SECTION is the section number (in objfile->section_offsets) of the blockvector and linetable. Note that it is possible for end_symtab() to return NULL. In particular, for the DWARF case at least, it will return NULL when it finds a compilation unit that has exactly one DIE, a TAG_compile_unit DIE. This can happen when we link in an object file that was compiled from an empty source file. Returning NULL is probably not the correct thing to do, because then gdb will never know about this empty file (FIXME). */ struct symtab * end_symtab (CORE_ADDR end_addr, struct objfile *objfile, int section) { struct symtab *symtab = NULL; struct blockvector *blockvector; struct subfile *subfile; struct context_stack *cstk; struct subfile *nextsub; /* Finish the lexical context of the last function in the file; pop the context stack. */ if (context_stack_depth > 0) { cstk = pop_context (); /* Make a block for the local symbols within. */ finish_block (cstk->name, &local_symbols, cstk->old_blocks, cstk->start_addr, end_addr, objfile); if (context_stack_depth > 0) { /* This is said to happen with SCO. The old coffread.c code simply emptied the context stack, so we do the same. FIXME: Find out why it is happening. This is not believed to happen in most cases (even for coffread.c); it used to be an abort(). */ complaint (&symfile_complaints, _("Context stack not empty in end_symtab")); context_stack_depth = 0; } } /* Reordered executables may have out of order pending blocks; if OBJF_REORDERED is true, then sort the pending blocks. */ if ((objfile->flags & OBJF_REORDERED) && pending_blocks) { unsigned count = 0; struct pending_block *pb; struct block **barray, **bp; struct cleanup *back_to; for (pb = pending_blocks; pb != NULL; pb = pb->next) count++; barray = xmalloc (sizeof (*barray) * count); back_to = make_cleanup (xfree, barray); bp = barray; for (pb = pending_blocks; pb != NULL; pb = pb->next) *bp++ = pb->block; qsort (barray, count, sizeof (*barray), block_compar); bp = barray; for (pb = pending_blocks; pb != NULL; pb = pb->next) pb->block = *bp++; do_cleanups (back_to); } /* Cleanup any undefined types that have been left hanging around (this needs to be done before the finish_blocks so that file_symbols is still good). Both cleanup_undefined_types and finish_global_stabs are stabs specific, but harmless for other symbol readers, since on gdb startup or when finished reading stabs, the state is set so these are no-ops. FIXME: Is this handled right in case of QUIT? Can we make this cleaner? */ cleanup_undefined_types (objfile); finish_global_stabs (objfile); if (pending_blocks == NULL && file_symbols == NULL && global_symbols == NULL && have_line_numbers == 0 && pending_macros == NULL) { /* Ignore symtabs that have no functions with real debugging info. */ blockvector = NULL; } else { /* Define the STATIC_BLOCK & GLOBAL_BLOCK, and build the blockvector. */ finish_block (0, &file_symbols, 0, last_source_start_addr, end_addr, objfile); finish_block (0, &global_symbols, 0, last_source_start_addr, end_addr, objfile); blockvector = make_blockvector (objfile); } /* Read the line table if it has to be read separately. */ if (objfile->sf->sym_read_linetable != NULL) objfile->sf->sym_read_linetable (); /* Handle the case where the debug info specifies a different path for the main source file. It can cause us to lose track of its line number information. */ watch_main_source_file_lossage (); /* Now create the symtab objects proper, one for each subfile. */ /* (The main file is the last one on the chain.) */ for (subfile = subfiles; subfile; subfile = nextsub) { int linetablesize = 0; symtab = NULL; /* If we have blocks of symbols, make a symtab. Otherwise, just ignore this file and any line number info in it. */ if (blockvector) { if (subfile->line_vector) { linetablesize = sizeof (struct linetable) + subfile->line_vector->nitems * sizeof (struct linetable_entry); /* Like the pending blocks, the line table may be scrambled in reordered executables. Sort it if OBJF_REORDERED is true. */ if (objfile->flags & OBJF_REORDERED) qsort (subfile->line_vector->item, subfile->line_vector->nitems, sizeof (struct linetable_entry), compare_line_numbers); } /* Now, allocate a symbol table. */ if (subfile->symtab == NULL) symtab = allocate_symtab (subfile->name, objfile); else symtab = subfile->symtab; /* Fill in its components. */ symtab->blockvector = blockvector; symtab->macro_table = pending_macros; if (subfile->line_vector) { /* Reallocate the line table on the symbol obstack */ symtab->linetable = (struct linetable *) obstack_alloc (&objfile->objfile_obstack, linetablesize); memcpy (symtab->linetable, subfile->line_vector, linetablesize); } else { symtab->linetable = NULL; } symtab->block_line_section = section; if (subfile->dirname) { /* Reallocate the dirname on the symbol obstack */ symtab->dirname = (char *) obstack_alloc (&objfile->objfile_obstack, strlen (subfile->dirname) + 1); strcpy (symtab->dirname, subfile->dirname); } else { symtab->dirname = NULL; } symtab->free_code = free_linetable; symtab->free_func = NULL; /* Use whatever language we have been using for this subfile, not the one that was deduced in allocate_symtab from the filename. We already did our own deducing when we created the subfile, and we may have altered our opinion of what language it is from things we found in the symbols. */ symtab->language = subfile->language; /* Save the debug format string (if any) in the symtab */ if (subfile->debugformat != NULL) { symtab->debugformat = obsavestring (subfile->debugformat, strlen (subfile->debugformat), &objfile->objfile_obstack); } /* Similarly for the producer. */ if (subfile->producer != NULL) symtab->producer = obsavestring (subfile->producer, strlen (subfile->producer), &objfile->objfile_obstack); /* All symtabs for the main file and the subfiles share a blockvector, so we need to clear primary for everything but the main file. */ symtab->primary = 0; } else { if (subfile->symtab) { /* Since we are ignoring that subfile, we also need to unlink the associated empty symtab that we created. Otherwise, we can into trouble because various parts such as the block-vector are uninitialized whereas the rest of the code assumes that they are. We can only unlink the symtab because it was allocated on the objfile obstack. */ struct symtab *s; if (objfile->symtabs == subfile->symtab) objfile->symtabs = objfile->symtabs->next; else ALL_OBJFILE_SYMTABS (objfile, s) if (s->next == subfile->symtab) { s->next = s->next->next; break; } subfile->symtab = NULL; } } if (subfile->name != NULL) { xfree ((void *) subfile->name); } if (subfile->dirname != NULL) { xfree ((void *) subfile->dirname); } if (subfile->line_vector != NULL) { xfree ((void *) subfile->line_vector); } if (subfile->debugformat != NULL) { xfree ((void *) subfile->debugformat); } if (subfile->producer != NULL) xfree (subfile->producer); nextsub = subfile->next; xfree ((void *) subfile); } /* Set this for the main source file. */ if (symtab) { symtab->primary = 1; } /* Default any symbols without a specified symtab to the primary symtab. */ if (blockvector) { int block_i; for (block_i = 0; block_i < BLOCKVECTOR_NBLOCKS (blockvector); block_i++) { struct block *block = BLOCKVECTOR_BLOCK (blockvector, block_i); struct symbol *sym; struct dict_iterator iter; /* Inlined functions may have symbols not in the global or static symbol lists. */ if (BLOCK_FUNCTION (block) != NULL) if (SYMBOL_SYMTAB (BLOCK_FUNCTION (block)) == NULL) SYMBOL_SYMTAB (BLOCK_FUNCTION (block)) = symtab; for (sym = dict_iterator_first (BLOCK_DICT (block), &iter); sym != NULL; sym = dict_iterator_next (&iter)) if (SYMBOL_SYMTAB (sym) == NULL) SYMBOL_SYMTAB (sym) = symtab; } } last_source_file = NULL; current_subfile = NULL; pending_macros = NULL; if (pending_addrmap) { obstack_free (&pending_addrmap_obstack, NULL); pending_addrmap = NULL; } return symtab; } /* Push a context block. Args are an identifying nesting level (checkable when you pop it), and the starting PC address of this context. */ struct context_stack * push_context (int desc, CORE_ADDR valu) { struct context_stack *new; if (context_stack_depth == context_stack_size) { context_stack_size *= 2; context_stack = (struct context_stack *) xrealloc ((char *) context_stack, (context_stack_size * sizeof (struct context_stack))); } new = &context_stack[context_stack_depth++]; new->depth = desc; new->locals = local_symbols; new->params = param_symbols; new->old_blocks = pending_blocks; new->start_addr = valu; new->using_directives = using_directives; new->name = NULL; local_symbols = NULL; param_symbols = NULL; using_directives = NULL; return new; } /* Pop a context block. Returns the address of the context block just popped. */ struct context_stack * pop_context (void) { gdb_assert (context_stack_depth > 0); return (&context_stack[--context_stack_depth]); } /* Compute a small integer hash code for the given name. */ int hashname (char *name) { return (hash(name,strlen(name)) % HASHSIZE); } void record_debugformat (char *format) { current_subfile->debugformat = xstrdup (format); } void record_producer (const char *producer) { /* The producer is not always provided in the debugging info. Do nothing if PRODUCER is NULL. */ if (producer == NULL) return; current_subfile->producer = xstrdup (producer); } /* Merge the first symbol list SRCLIST into the second symbol list TARGETLIST by repeated calls to add_symbol_to_list(). This procedure "frees" each link of SRCLIST by adding it to the free_pendings list. Caller must set SRCLIST to a null list after calling this function. Void return. */ void merge_symbol_lists (struct pending **srclist, struct pending **targetlist) { int i; if (!srclist || !*srclist) return; /* Merge in elements from current link. */ for (i = 0; i < (*srclist)->nsyms; i++) add_symbol_to_list ((*srclist)->symbol[i], targetlist); /* Recurse on next. */ merge_symbol_lists (&(*srclist)->next, targetlist); /* "Free" the current link. */ (*srclist)->next = free_pendings; free_pendings = (*srclist); } /* Initialize anything that needs initializing when starting to read a fresh piece of a symbol file, e.g. reading in the stuff corresponding to a psymtab. */ void buildsym_init (void) { free_pendings = NULL; file_symbols = NULL; global_symbols = NULL; pending_blocks = NULL; pending_macros = NULL; /* We shouldn't have any address map at this point. */ gdb_assert (! pending_addrmap); pending_addrmap_interesting = 0; } /* Initialize anything that needs initializing when a completely new symbol file is specified (not just adding some symbols from another file, e.g. a shared library). */ void buildsym_new_init (void) { buildsym_init (); }
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