1 /* Build symbol tables in GDB's internal format.
2 Copyright (C) 1986-1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* This module provides definitions used for creating and adding to
21 the symbol table. These routines are called from various symbol-
22 file-reading routines.
24 They originated in dbxread.c of gdb-4.2, and were split out to
25 make xcoffread.c more maintainable by sharing code.
27 Variables declared in this file can be defined by #define-ing
28 the name EXTERN to null. It is used to declare variables that
29 are normally extern, but which get defined in a single module
30 using this technique. */
36 extern void add_symbol_to_list ();
37 extern void process_one_symbol ();
38 extern struct type *read_type ();
39 extern struct type *read_range_type ();
40 extern struct type *read_enum_type ();
41 extern struct type *read_struct_type ();
42 extern struct type *read_array_type ();
43 extern struct type **read_args ();
44 extern struct type **dbx_lookup_type ();
45 extern long read_number ();
46 extern void finish_block ();
47 extern struct blockvector *make_blockvector ();
48 extern void add_undefined_type ();
49 extern void really_free_pendings ();
50 extern void start_subfile ();
51 extern struct symtab *end_symtab ();
52 extern void scan_file_globals ();
53 extern void buildsym_new_init ();
54 extern void buildsym_init ();
56 /* Convert stab register number (from `r' declaration) to a gdb REGNUM. */
58 #ifndef STAB_REG_TO_REGNUM
59 #define STAB_REG_TO_REGNUM(VALUE) (VALUE)
62 /* Name of source file whose symbol data we are now processing.
63 This comes from a symbol of type N_SO. */
65 EXTERN char *last_source_file;
67 /* Core address of start of text of current source file.
68 This too comes from the N_SO symbol. */
70 EXTERN CORE_ADDR last_source_start_addr;
72 /* The list of sub-source-files within the current individual compilation.
73 Each file gets its own symtab with its own linetable and associated info,
74 but they all share one blockvector. */
81 struct linetable *line_vector;
82 int line_vector_length;
85 EXTERN struct subfile *subfiles;
87 EXTERN struct subfile *current_subfile;
89 /* Global variable which, when set, indicates that we are processing a
90 .o file compiled with gcc */
92 EXTERN unsigned char processing_gcc_compilation;
94 /* Count symbols as they are processed, for error messages. */
96 EXTERN unsigned int symnum;
98 /* Vector of types defined so far, indexed by their dbx type numbers.
99 (In newer sun systems, dbx uses a pair of numbers in parens,
100 as in "(SUBFILENUM,NUMWITHINSUBFILE)". Then these numbers must be
101 translated through the type_translations hash table to get
102 the index into the type vector.) */
104 EXTERN struct type **type_vector;
106 /* Number of elements allocated for type_vector currently. */
108 EXTERN int type_vector_length;
110 /* Hash table of global symbols whose values are not known yet.
111 They are chained thru the SYMBOL_VALUE_CHAIN, since we don't
112 have the correct data for that slot yet. */
113 /* The use of the LOC_BLOCK code in this chain is nonstandard--
114 it refers to a FORTRAN common block rather than the usual meaning. */
117 EXTERN struct symbol *global_sym_chain[HASHSIZE];
119 /* Record the symbols defined for each context in a list.
120 We don't create a struct block for the context until we
121 know how long to make it. */
123 #define PENDINGSIZE 100
127 struct pending *next;
129 struct symbol *symbol[PENDINGSIZE];
132 /* List of free `struct pending' structures for reuse. */
133 EXTERN struct pending *free_pendings;
135 /* Here are the three lists that symbols are put on. */
137 EXTERN struct pending *file_symbols; /* static at top level, and types */
139 EXTERN struct pending *global_symbols; /* global functions and variables */
141 EXTERN struct pending *local_symbols; /* everything local to lexic context */
143 /* Kludge for xcoffread.c */
144 struct pending_stabs {
149 EXTERN struct pending_stabs *global_stabs;
150 EXTERN struct pending_stabs *file_stabs;
152 /* List of symbols declared since the last BCOMM. This list is a tail
153 of local_symbols. When ECOMM is seen, the symbols on the list
154 are noted so their proper addresses can be filled in later,
155 using the common block base address gotten from the assembler
158 EXTERN struct pending *common_block;
159 EXTERN int common_block_i;
161 /* Stack representing unclosed lexical contexts
162 (that will become blocks, eventually). */
166 struct pending *locals;
167 struct pending_block *old_blocks;
169 CORE_ADDR start_addr;
170 CORE_ADDR end_addr; /* Temp slot for exception handling. */
174 EXTERN struct context_stack *context_stack;
176 /* Index of first unused entry in context stack. */
177 EXTERN int context_stack_depth;
179 /* Currently allocated size of context stack. */
181 EXTERN int context_stack_size;
183 /* Nonzero if within a function (so symbols should be local,
184 if nothing says specifically). */
186 EXTERN int within_function;
188 /* List of blocks already made (lexical contexts already closed).
189 This is used at the end to make the blockvector. */
193 struct pending_block *next;
197 EXTERN struct pending_block *pending_blocks;
199 extern CORE_ADDR startup_file_start; /* From blockframe.c */
200 extern CORE_ADDR startup_file_end; /* From blockframe.c */
202 /* Global variable which, when set, indicates that we are processing a
203 .o file compiled with gcc */
205 EXTERN unsigned char processing_gcc_compilation;
207 /* Setup a define to deal cleanly with the underscore problem */
209 #ifdef NAMES_HAVE_UNDERSCORE
210 #define HASH_OFFSET 1
212 #define HASH_OFFSET 0
215 /* Support for Sun changes to dbx symbol format */
217 /* For each identified header file, we have a table of types defined
220 header_files maps header file names to their type tables.
221 It is a vector of n_header_files elements.
222 Each element describes one header file.
223 It contains a vector of types.
225 Sometimes it can happen that the same header file produces
226 different results when included in different places.
227 This can result from conditionals or from different
228 things done before including the file.
229 When this happens, there are multiple entries for the file in this table,
230 one entry for each distinct set of results.
231 The entries are distinguished by the INSTANCE field.
232 The INSTANCE field appears in the N_BINCL and N_EXCL symbol table and is
233 used to match header-file references to their corresponding data. */
237 char *name; /* Name of header file */
238 int instance; /* Numeric code distinguishing instances
239 of one header file that produced
240 different results when included.
241 It comes from the N_BINCL or N_EXCL. */
242 struct type **vector; /* Pointer to vector of types */
243 int length; /* Allocated length (# elts) of that vector */
246 EXTERN struct header_file *header_files;
248 EXTERN int n_header_files;
250 EXTERN int n_allocated_header_files;
252 /* Within each object file, various header files are assigned numbers.
253 A type is defined or referred to with a pair of numbers
254 (FILENUM,TYPENUM) where FILENUM is the number of the header file
255 and TYPENUM is the number within that header file.
256 TYPENUM is the index within the vector of types for that header file.
258 FILENUM == 1 is special; it refers to the main source of the object file,
259 and not to any header file. FILENUM != 1 is interpreted by looking it up
260 in the following table, which contains indices in header_files. */
262 EXTERN int *this_object_header_files;
264 EXTERN int n_this_object_header_files;
266 EXTERN int n_allocated_this_object_header_files;