1 /* Symbol table definitions for GDB.
3 Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
4 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009, 2010,
5 2011 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #if !defined (SYMTAB_H)
25 /* Opaque declarations. */
38 /* Some of the structures in this file are space critical.
39 The space-critical structures are:
41 struct general_symbol_info
45 These structures are laid out to encourage good packing.
46 They use ENUM_BITFIELD and short int fields, and they order the
47 structure members so that fields less than a word are next
48 to each other so they can be packed together. */
50 /* Rearranged: used ENUM_BITFIELD and rearranged field order in
51 all the space critical structures (plus struct minimal_symbol).
52 Memory usage dropped from 99360768 bytes to 90001408 bytes.
53 I measured this with before-and-after tests of
54 "HEAD-old-gdb -readnow HEAD-old-gdb" and
55 "HEAD-new-gdb -readnow HEAD-old-gdb" on native i686-pc-linux-gnu,
56 red hat linux 8, with LD_LIBRARY_PATH=/usr/lib/debug,
57 typing "maint space 1" at the first command prompt.
59 Here is another measurement (from andrew c):
60 # no /usr/lib/debug, just plain glibc, like a normal user
62 (gdb) break internal_error
64 (gdb) maint internal-error
68 gdb gdb_6_0_branch 2003-08-19 space used: 8896512
69 gdb HEAD 2003-08-19 space used: 8904704
70 gdb HEAD 2003-08-21 space used: 8396800 (+symtab.h)
71 gdb HEAD 2003-08-21 space used: 8265728 (+gdbtypes.h)
73 The third line shows the savings from the optimizations in symtab.h.
74 The fourth line shows the savings from the optimizations in
75 gdbtypes.h. Both optimizations are in gdb HEAD now.
77 --chastain 2003-08-21 */
79 /* Struct for storing C++ specific information. Allocated when needed. */
86 /* Define a structure for the information that is common to all symbol types,
87 including minimal symbols, partial symbols, and full symbols. In a
88 multilanguage environment, some language specific information may need to
89 be recorded along with each symbol. */
91 /* This structure is space critical. See space comments at the top. */
93 struct general_symbol_info
95 /* Name of the symbol. This is a required field. Storage for the
96 name is allocated on the objfile_obstack for the associated
97 objfile. For languages like C++ that make a distinction between
98 the mangled name and demangled name, this is the mangled
103 /* Value of the symbol. Which member of this union to use, and what
104 it means, depends on what kind of symbol this is and its
105 SYMBOL_CLASS. See comments there for more details. All of these
106 are in host byte order (though what they point to might be in
107 target byte order, e.g. LOC_CONST_BYTES). */
111 /* The fact that this is a long not a LONGEST mainly limits the
112 range of a LOC_CONST. Since LOC_CONST_BYTES exists, I'm not
113 sure that is a big deal. */
122 /* For opaque typedef struct chain. */
124 struct symbol *chain;
128 /* Since one and only one language can apply, wrap the language specific
129 information inside a union. */
133 /* This is used by languages which wish to store a demangled name.
134 currently used by Ada, Java, and Objective C. */
137 char *demangled_name;
141 struct cplus_specific *cplus_specific;
145 /* Record the source code language that applies to this symbol.
146 This is used to select one of the fields from the language specific
149 ENUM_BITFIELD(language) language : 8;
151 /* Which section is this symbol in? This is an index into
152 section_offsets for this objfile. Negative means that the symbol
153 does not get relocated relative to a section.
154 Disclaimer: currently this is just used for xcoff, so don't
155 expect all symbol-reading code to set it correctly (the ELF code
156 also tries to set it correctly). */
160 /* The section associated with this symbol. It can be NULL. */
162 struct obj_section *obj_section;
165 extern void symbol_set_demangled_name (struct general_symbol_info *, char *,
168 extern char *symbol_get_demangled_name (const struct general_symbol_info *);
170 extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
172 /* Note that all the following SYMBOL_* macros are used with the
173 SYMBOL argument being either a partial symbol, a minimal symbol or
174 a full symbol. All three types have a ginfo field. In particular
175 the SYMBOL_SET_LANGUAGE, SYMBOL_DEMANGLED_NAME, etc.
176 macros cannot be entirely substituted by
177 functions, unless the callers are changed to pass in the ginfo
178 field only, instead of the SYMBOL parameter. */
180 #define SYMBOL_VALUE(symbol) (symbol)->ginfo.value.ivalue
181 #define SYMBOL_VALUE_ADDRESS(symbol) (symbol)->ginfo.value.address
182 #define SYMBOL_VALUE_BYTES(symbol) (symbol)->ginfo.value.bytes
183 #define SYMBOL_BLOCK_VALUE(symbol) (symbol)->ginfo.value.block
184 #define SYMBOL_VALUE_CHAIN(symbol) (symbol)->ginfo.value.chain
185 #define SYMBOL_LANGUAGE(symbol) (symbol)->ginfo.language
186 #define SYMBOL_SECTION(symbol) (symbol)->ginfo.section
187 #define SYMBOL_OBJ_SECTION(symbol) (symbol)->ginfo.obj_section
189 /* Initializes the language dependent portion of a symbol
190 depending upon the language for the symbol. */
191 #define SYMBOL_SET_LANGUAGE(symbol,language) \
192 (symbol_set_language (&(symbol)->ginfo, (language)))
193 extern void symbol_set_language (struct general_symbol_info *symbol,
194 enum language language);
196 /* Set just the linkage name of a symbol; do not try to demangle
197 it. Used for constructs which do not have a mangled name,
198 e.g. struct tags. Unlike SYMBOL_SET_NAMES, linkage_name must
199 be terminated and either already on the objfile's obstack or
200 permanently allocated. */
201 #define SYMBOL_SET_LINKAGE_NAME(symbol,linkage_name) \
202 (symbol)->ginfo.name = (linkage_name)
204 /* Set the linkage and natural names of a symbol, by demangling
206 #define SYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile) \
207 symbol_set_names (&(symbol)->ginfo, linkage_name, len, copy_name, objfile)
208 extern void symbol_set_names (struct general_symbol_info *symbol,
209 const char *linkage_name, int len, int copy_name,
210 struct objfile *objfile);
212 /* Now come lots of name accessor macros. Short version as to when to
213 use which: Use SYMBOL_NATURAL_NAME to refer to the name of the
214 symbol in the original source code. Use SYMBOL_LINKAGE_NAME if you
215 want to know what the linker thinks the symbol's name is. Use
216 SYMBOL_PRINT_NAME for output. Use SYMBOL_DEMANGLED_NAME if you
217 specifically need to know whether SYMBOL_NATURAL_NAME and
218 SYMBOL_LINKAGE_NAME are different. */
220 /* Return SYMBOL's "natural" name, i.e. the name that it was called in
221 the original source code. In languages like C++ where symbols may
222 be mangled for ease of manipulation by the linker, this is the
225 #define SYMBOL_NATURAL_NAME(symbol) \
226 (symbol_natural_name (&(symbol)->ginfo))
227 extern char *symbol_natural_name (const struct general_symbol_info *symbol);
229 /* Return SYMBOL's name from the point of view of the linker. In
230 languages like C++ where symbols may be mangled for ease of
231 manipulation by the linker, this is the mangled name; otherwise,
232 it's the same as SYMBOL_NATURAL_NAME. */
234 #define SYMBOL_LINKAGE_NAME(symbol) (symbol)->ginfo.name
236 /* Return the demangled name for a symbol based on the language for
237 that symbol. If no demangled name exists, return NULL. */
238 #define SYMBOL_DEMANGLED_NAME(symbol) \
239 (symbol_demangled_name (&(symbol)->ginfo))
240 extern char *symbol_demangled_name (const struct general_symbol_info *symbol);
242 /* Macro that returns a version of the name of a symbol that is
243 suitable for output. In C++ this is the "demangled" form of the
244 name if demangle is on and the "mangled" form of the name if
245 demangle is off. In other languages this is just the symbol name.
246 The result should never be NULL. Don't use this for internal
247 purposes (e.g. storing in a hashtable): it's only suitable for
250 #define SYMBOL_PRINT_NAME(symbol) \
251 (demangle ? SYMBOL_NATURAL_NAME (symbol) : SYMBOL_LINKAGE_NAME (symbol))
253 /* Macro that tests a symbol for a match against a specified name string.
254 First test the unencoded name, then looks for and test a C++ encoded
255 name if it exists. Note that whitespace is ignored while attempting to
256 match a C++ encoded name, so that "foo::bar(int,long)" is the same as
257 "foo :: bar (int, long)".
258 Evaluates to zero if the match fails, or nonzero if it succeeds. */
260 /* Macro that tests a symbol for a match against a specified name
261 string. It tests against SYMBOL_NATURAL_NAME, and it ignores
262 whitespace and trailing parentheses. (See strcmp_iw for details
263 about its behavior.) */
265 #define SYMBOL_MATCHES_NATURAL_NAME(symbol, name) \
266 (strcmp_iw (SYMBOL_NATURAL_NAME (symbol), (name)) == 0)
268 /* Macro that returns the name to be used when sorting and searching symbols.
269 In C++, Chill, and Java, we search for the demangled form of a name,
270 and so sort symbols accordingly. In Ada, however, we search by mangled
271 name. If there is no distinct demangled name, then SYMBOL_SEARCH_NAME
272 returns the same value (same pointer) as SYMBOL_LINKAGE_NAME. */
273 #define SYMBOL_SEARCH_NAME(symbol) \
274 (symbol_search_name (&(symbol)->ginfo))
275 extern char *symbol_search_name (const struct general_symbol_info *);
277 /* Analogous to SYMBOL_MATCHES_NATURAL_NAME, but uses the search
279 #define SYMBOL_MATCHES_SEARCH_NAME(symbol, name) \
280 (strcmp_iw (SYMBOL_SEARCH_NAME (symbol), (name)) == 0)
282 /* Classification types for a minimal symbol. These should be taken as
283 "advisory only", since if gdb can't easily figure out a
284 classification it simply selects mst_unknown. It may also have to
285 guess when it can't figure out which is a better match between two
286 types (mst_data versus mst_bss) for example. Since the minimal
287 symbol info is sometimes derived from the BFD library's view of a
288 file, we need to live with what information bfd supplies. */
290 enum minimal_symbol_type
292 mst_unknown = 0, /* Unknown type, the default */
293 mst_text, /* Generally executable instructions */
294 mst_text_gnu_ifunc, /* Executable code returning address
295 of executable code */
296 mst_slot_got_plt, /* GOT entries for .plt sections */
297 mst_data, /* Generally initialized data */
298 mst_bss, /* Generally uninitialized data */
299 mst_abs, /* Generally absolute (nonrelocatable) */
300 /* GDB uses mst_solib_trampoline for the start address of a shared
301 library trampoline entry. Breakpoints for shared library functions
302 are put there if the shared library is not yet loaded.
303 After the shared library is loaded, lookup_minimal_symbol will
304 prefer the minimal symbol from the shared library (usually
305 a mst_text symbol) over the mst_solib_trampoline symbol, and the
306 breakpoints will be moved to their true address in the shared
307 library via breakpoint_re_set. */
308 mst_solib_trampoline, /* Shared library trampoline code */
309 /* For the mst_file* types, the names are only guaranteed to be unique
310 within a given .o file. */
311 mst_file_text, /* Static version of mst_text */
312 mst_file_data, /* Static version of mst_data */
313 mst_file_bss /* Static version of mst_bss */
316 /* Define a simple structure used to hold some very basic information about
317 all defined global symbols (text, data, bss, abs, etc). The only required
318 information is the general_symbol_info.
320 In many cases, even if a file was compiled with no special options for
321 debugging at all, as long as was not stripped it will contain sufficient
322 information to build a useful minimal symbol table using this structure.
323 Even when a file contains enough debugging information to build a full
324 symbol table, these minimal symbols are still useful for quickly mapping
325 between names and addresses, and vice versa. They are also sometimes
326 used to figure out what full symbol table entries need to be read in. */
328 struct minimal_symbol
331 /* The general symbol info required for all types of symbols.
333 The SYMBOL_VALUE_ADDRESS contains the address that this symbol
336 struct general_symbol_info ginfo;
338 /* Size of this symbol. end_psymtab in dbxread.c uses this
339 information to calculate the end of the partial symtab based on the
340 address of the last symbol plus the size of the last symbol. */
344 /* Which source file is this symbol in? Only relevant for mst_file_*. */
347 /* Classification type for this minimal symbol. */
349 ENUM_BITFIELD(minimal_symbol_type) type : 8;
351 /* Two flag bits provided for the use of the target. */
352 unsigned int target_flag_1 : 1;
353 unsigned int target_flag_2 : 1;
355 /* Minimal symbols with the same hash key are kept on a linked
356 list. This is the link. */
358 struct minimal_symbol *hash_next;
360 /* Minimal symbols are stored in two different hash tables. This is
361 the `next' pointer for the demangled hash table. */
363 struct minimal_symbol *demangled_hash_next;
366 #define MSYMBOL_TARGET_FLAG_1(msymbol) (msymbol)->target_flag_1
367 #define MSYMBOL_TARGET_FLAG_2(msymbol) (msymbol)->target_flag_2
368 #define MSYMBOL_SIZE(msymbol) (msymbol)->size
369 #define MSYMBOL_TYPE(msymbol) (msymbol)->type
373 /* Represent one symbol name; a variable, constant, function or typedef. */
375 /* Different name domains for symbols. Looking up a symbol specifies a
376 domain and ignores symbol definitions in other name domains. */
378 typedef enum domain_enum_tag
380 /* UNDEF_DOMAIN is used when a domain has not been discovered or
381 none of the following apply. This usually indicates an error either
382 in the symbol information or in gdb's handling of symbols. */
386 /* VAR_DOMAIN is the usual domain. In C, this contains variables,
387 function names, typedef names and enum type values. */
391 /* STRUCT_DOMAIN is used in C to hold struct, union and enum type names.
392 Thus, if `struct foo' is used in a C program, it produces a symbol named
393 `foo' in the STRUCT_DOMAIN. */
397 /* LABEL_DOMAIN may be used for names of labels (for gotos). */
402 /* Searching domains, used for `search_symbols'. Element numbers are
403 hardcoded in GDB, check all enum uses before changing it. */
407 /* Everything in VAR_DOMAIN minus FUNCTIONS_DOMAIN and
409 VARIABLES_DOMAIN = 0,
411 /* All functions -- for some reason not methods, though. */
412 FUNCTIONS_DOMAIN = 1,
414 /* All defined types */
421 /* An address-class says where to find the value of a symbol. */
425 /* Not used; catches errors. */
429 /* Value is constant int SYMBOL_VALUE, host byteorder. */
433 /* Value is at fixed address SYMBOL_VALUE_ADDRESS. */
437 /* Value is in register. SYMBOL_VALUE is the register number
438 in the original debug format. SYMBOL_REGISTER_OPS holds a
439 function that can be called to transform this into the
440 actual register number this represents in a specific target
441 architecture (gdbarch).
443 For some symbol formats (stabs, for some compilers at least),
444 the compiler generates two symbols, an argument and a register.
445 In some cases we combine them to a single LOC_REGISTER in symbol
446 reading, but currently not for all cases (e.g. it's passed on the
447 stack and then loaded into a register). */
451 /* It's an argument; the value is at SYMBOL_VALUE offset in arglist. */
455 /* Value address is at SYMBOL_VALUE offset in arglist. */
459 /* Value is in specified register. Just like LOC_REGISTER except the
460 register holds the address of the argument instead of the argument
461 itself. This is currently used for the passing of structs and unions
462 on sparc and hppa. It is also used for call by reference where the
463 address is in a register, at least by mipsread.c. */
467 /* Value is a local variable at SYMBOL_VALUE offset in stack frame. */
471 /* Value not used; definition in SYMBOL_TYPE. Symbols in the domain
472 STRUCT_DOMAIN all have this class. */
476 /* Value is address SYMBOL_VALUE_ADDRESS in the code. */
480 /* In a symbol table, value is SYMBOL_BLOCK_VALUE of a `struct block'.
481 In a partial symbol table, SYMBOL_VALUE_ADDRESS is the start address
482 of the block. Function names have this class. */
486 /* Value is a constant byte-sequence pointed to by SYMBOL_VALUE_BYTES, in
487 target byte order. */
491 /* Value is at fixed address, but the address of the variable has
492 to be determined from the minimal symbol table whenever the
493 variable is referenced.
494 This happens if debugging information for a global symbol is
495 emitted and the corresponding minimal symbol is defined
496 in another object file or runtime common storage.
497 The linker might even remove the minimal symbol if the global
498 symbol is never referenced, in which case the symbol remains
501 GDB would normally find the symbol in the minimal symbol table if it will
502 not find it in the full symbol table. But a reference to an external
503 symbol in a local block shadowing other definition requires full symbol
504 without possibly having its address available for LOC_STATIC. Testcase
505 is provided as `gdb.dwarf2/dw2-unresolved.exp'. */
509 /* The variable does not actually exist in the program.
510 The value is ignored. */
514 /* The variable's address is computed by a set of location
515 functions (see "struct symbol_computed_ops" below). */
519 /* The methods needed to implement LOC_COMPUTED. These methods can
520 use the symbol's .aux_value for additional per-symbol information.
522 At present this is only used to implement location expressions. */
524 struct symbol_computed_ops
527 /* Return the value of the variable SYMBOL, relative to the stack
528 frame FRAME. If the variable has been optimized out, return
531 Iff `read_needs_frame (SYMBOL)' is zero, then FRAME may be zero. */
533 struct value *(*read_variable) (struct symbol * symbol,
534 struct frame_info * frame);
536 /* Return non-zero if we need a frame to find the value of the SYMBOL. */
537 int (*read_needs_frame) (struct symbol * symbol);
539 /* Write to STREAM a natural-language description of the location of
540 SYMBOL, in the context of ADDR. */
541 void (*describe_location) (struct symbol * symbol, CORE_ADDR addr,
542 struct ui_file * stream);
544 /* Tracepoint support. Append bytecodes to the tracepoint agent
545 expression AX that push the address of the object SYMBOL. Set
546 VALUE appropriately. Note --- for objects in registers, this
547 needn't emit any code; as long as it sets VALUE properly, then
548 the caller will generate the right code in the process of
549 treating this as an lvalue or rvalue. */
551 void (*tracepoint_var_ref) (struct symbol *symbol, struct gdbarch *gdbarch,
552 struct agent_expr *ax, struct axs_value *value);
555 /* Functions used with LOC_REGISTER and LOC_REGPARM_ADDR. */
557 struct symbol_register_ops
559 int (*register_number) (struct symbol *symbol, struct gdbarch *gdbarch);
562 /* This structure is space critical. See space comments at the top. */
567 /* The general symbol info required for all types of symbols. */
569 struct general_symbol_info ginfo;
571 /* Data type of value */
575 /* The symbol table containing this symbol. This is the file
576 associated with LINE. It can be NULL during symbols read-in but it is
577 never NULL during normal operation. */
578 struct symtab *symtab;
582 ENUM_BITFIELD(domain_enum_tag) domain : 6;
585 /* NOTE: cagney/2003-11-02: The fields "aclass" and "ops" contain
586 overlapping information. By creating a per-aclass ops vector, or
587 using the aclass as an index into an ops table, the aclass and
588 ops fields can be merged. The latter, for instance, would shave
589 32-bits from each symbol (relative to a symbol lookup, any table
590 index overhead would be in the noise). */
592 ENUM_BITFIELD(address_class) aclass : 6;
594 /* Whether this is an argument. */
596 unsigned is_argument : 1;
598 /* Whether this is an inlined function (class LOC_BLOCK only). */
599 unsigned is_inlined : 1;
601 /* True if this is a C++ function symbol with template arguments.
602 In this case the symbol is really a "struct template_symbol". */
603 unsigned is_cplus_template_function : 1;
605 /* Line number of this symbol's definition, except for inlined
606 functions. For an inlined function (class LOC_BLOCK and
607 SYMBOL_INLINED set) this is the line number of the function's call
608 site. Inlined function symbols are not definitions, and they are
609 never found by symbol table lookup.
611 FIXME: Should we really make the assumption that nobody will try
612 to debug files longer than 64K lines? What about machine
613 generated programs? */
617 /* Method's for symbol's of this class. */
618 /* NOTE: cagney/2003-11-02: See comment above attached to "aclass". */
622 /* Used with LOC_COMPUTED. */
623 const struct symbol_computed_ops *ops_computed;
625 /* Used with LOC_REGISTER and LOC_REGPARM_ADDR. */
626 const struct symbol_register_ops *ops_register;
629 /* An arbitrary data pointer, allowing symbol readers to record
630 additional information on a per-symbol basis. Note that this data
631 must be allocated using the same obstack as the symbol itself. */
632 /* So far it is only used by LOC_COMPUTED to
633 find the location information. For a LOC_BLOCK symbol
634 for a function in a compilation unit compiled with DWARF 2
635 information, this is information used internally by the DWARF 2
636 code --- specifically, the location expression for the frame
637 base for this function. */
638 /* FIXME drow/2003-02-21: For the LOC_BLOCK case, it might be better
639 to add a magic symbol to the block containing this information,
640 or to have a generic debug info annotation slot for symbols. */
644 struct symbol *hash_next;
648 #define SYMBOL_DOMAIN(symbol) (symbol)->domain
649 #define SYMBOL_CLASS(symbol) (symbol)->aclass
650 #define SYMBOL_IS_ARGUMENT(symbol) (symbol)->is_argument
651 #define SYMBOL_INLINED(symbol) (symbol)->is_inlined
652 #define SYMBOL_IS_CPLUS_TEMPLATE_FUNCTION(symbol) \
653 (symbol)->is_cplus_template_function
654 #define SYMBOL_TYPE(symbol) (symbol)->type
655 #define SYMBOL_LINE(symbol) (symbol)->line
656 #define SYMBOL_SYMTAB(symbol) (symbol)->symtab
657 #define SYMBOL_COMPUTED_OPS(symbol) (symbol)->ops.ops_computed
658 #define SYMBOL_REGISTER_OPS(symbol) (symbol)->ops.ops_register
659 #define SYMBOL_LOCATION_BATON(symbol) (symbol)->aux_value
661 /* An instance of this type is used to represent a C++ template
662 function. It includes a "struct symbol" as a kind of base class;
663 users downcast to "struct template_symbol *" when needed. A symbol
664 is really of this type iff SYMBOL_IS_CPLUS_TEMPLATE_FUNCTION is
667 struct template_symbol
669 /* The base class. */
672 /* The number of template arguments. */
673 int n_template_arguments;
675 /* The template arguments. This is an array with
676 N_TEMPLATE_ARGUMENTS elements. */
677 struct symbol **template_arguments;
681 /* Each item represents a line-->pc (or the reverse) mapping. This is
682 somewhat more wasteful of space than one might wish, but since only
683 the files which are actually debugged are read in to core, we don't
686 struct linetable_entry
692 /* The order of entries in the linetable is significant. They should
693 be sorted by increasing values of the pc field. If there is more than
694 one entry for a given pc, then I'm not sure what should happen (and
695 I not sure whether we currently handle it the best way).
697 Example: a C for statement generally looks like this
699 10 0x100 - for the init/test part of a for stmt.
702 10 0x400 - for the increment part of a for stmt.
704 If an entry has a line number of zero, it marks the start of a PC
705 range for which no line number information is available. It is
706 acceptable, though wasteful of table space, for such a range to be
713 /* Actually NITEMS elements. If you don't like this use of the
714 `struct hack', you can shove it up your ANSI (seriously, if the
715 committee tells us how to do it, we can probably go along). */
716 struct linetable_entry item[1];
719 /* How to relocate the symbols from each section in a symbol file.
720 Each struct contains an array of offsets.
721 The ordering and meaning of the offsets is file-type-dependent;
722 typically it is indexed by section numbers or symbol types or
725 To give us flexibility in changing the internal representation
726 of these offsets, the ANOFFSET macro must be used to insert and
727 extract offset values in the struct. */
729 struct section_offsets
731 CORE_ADDR offsets[1]; /* As many as needed. */
734 #define ANOFFSET(secoff, whichone) \
736 ? (internal_error (__FILE__, __LINE__, \
737 _("Section index is uninitialized")), -1) \
738 : secoff->offsets[whichone])
740 /* The size of a section_offsets table for N sections. */
741 #define SIZEOF_N_SECTION_OFFSETS(n) \
742 (sizeof (struct section_offsets) \
743 + sizeof (((struct section_offsets *) 0)->offsets) * ((n)-1))
745 /* Each source file or header is represented by a struct symtab.
746 These objects are chained through the `next' field. */
750 /* Unordered chain of all existing symtabs of this objfile. */
754 /* List of all symbol scope blocks for this symtab. May be shared
755 between different symtabs (and normally is for all the symtabs
756 in a given compilation unit). */
758 struct blockvector *blockvector;
760 /* Table mapping core addresses to line numbers for this file.
761 Can be NULL if none. Never shared between different symtabs. */
763 struct linetable *linetable;
765 /* Section in objfile->section_offsets for the blockvector and
766 the linetable. Probably always SECT_OFF_TEXT. */
768 int block_line_section;
770 /* If several symtabs share a blockvector, exactly one of them
771 should be designated the primary, so that the blockvector
772 is relocated exactly once by objfile_relocate. */
774 unsigned int primary : 1;
776 /* Symtab has been compiled with both optimizations and debug info so that
777 GDB may stop skipping prologues as variables locations are valid already
778 at function entry points. */
780 unsigned int locations_valid : 1;
782 /* DWARF unwinder for this CU is valid even for epilogues (PC at the return
783 instruction). This is supported by GCC since 4.5.0. */
785 unsigned int epilogue_unwind_valid : 1;
787 /* The macro table for this symtab. Like the blockvector, this
788 may be shared between different symtabs --- and normally is for
789 all the symtabs in a given compilation unit. */
790 struct macro_table *macro_table;
792 /* Name of this source file. */
796 /* Directory in which it was compiled, or NULL if we don't know. */
800 /* Total number of lines found in source file. */
804 /* line_charpos[N] is the position of the (N-1)th line of the
805 source file. "position" means something we can lseek() to; it
806 is not guaranteed to be useful any other way. */
810 /* Language of this source file. */
812 enum language language;
814 /* String that identifies the format of the debugging information, such
815 as "stabs", "dwarf 1", "dwarf 2", "coff", etc. This is mostly useful
816 for automated testing of gdb but may also be information that is
817 useful to the user. */
819 const char *debugformat;
821 /* String of producer version information. May be zero. */
823 const char *producer;
825 /* Full name of file as found by searching the source path.
826 NULL if not yet known. */
830 /* Object file from which this symbol information was read. */
832 struct objfile *objfile;
836 #define BLOCKVECTOR(symtab) (symtab)->blockvector
837 #define LINETABLE(symtab) (symtab)->linetable
838 #define SYMTAB_PSPACE(symtab) (symtab)->objfile->pspace
841 /* The virtual function table is now an array of structures which have the
842 form { int16 offset, delta; void *pfn; }.
844 In normal virtual function tables, OFFSET is unused.
845 DELTA is the amount which is added to the apparent object's base
846 address in order to point to the actual object to which the
847 virtual function should be applied.
848 PFN is a pointer to the virtual function.
850 Note that this macro is g++ specific (FIXME). */
852 #define VTBL_FNADDR_OFFSET 2
854 /* External variables and functions for the objects described above. */
856 /* True if we are nested inside psymtab_to_symtab. */
858 extern int currently_reading_symtab;
862 extern int asm_demangle;
864 /* symtab.c lookup functions */
866 extern const char multiple_symbols_ask[];
867 extern const char multiple_symbols_all[];
868 extern const char multiple_symbols_cancel[];
870 const char *multiple_symbols_select_mode (void);
872 int symbol_matches_domain (enum language symbol_language,
873 domain_enum symbol_domain,
876 /* lookup a symbol table by source file name. */
878 extern struct symtab *lookup_symtab (const char *);
880 /* lookup a symbol by name (optional block) in language. */
882 extern struct symbol *lookup_symbol_in_language (const char *,
883 const struct block *,
888 /* lookup a symbol by name (optional block, optional symtab)
889 in the current language. */
891 extern struct symbol *lookup_symbol (const char *, const struct block *,
892 const domain_enum, int *);
894 /* A default version of lookup_symbol_nonlocal for use by languages
895 that can't think of anything better to do. */
897 extern struct symbol *basic_lookup_symbol_nonlocal (const char *,
898 const struct block *,
901 /* Some helper functions for languages that need to write their own
902 lookup_symbol_nonlocal functions. */
904 /* Lookup a symbol in the static block associated to BLOCK, if there
905 is one; do nothing if BLOCK is NULL or a global block. */
907 extern struct symbol *lookup_symbol_static (const char *name,
908 const struct block *block,
909 const domain_enum domain);
911 /* Lookup a symbol in all files' global blocks (searching psymtabs if
914 extern struct symbol *lookup_symbol_global (const char *name,
915 const struct block *block,
916 const domain_enum domain);
918 /* Lookup a symbol within the block BLOCK. This, unlike
919 lookup_symbol_block, will set SYMTAB and BLOCK_FOUND correctly, and
920 will fix up the symbol if necessary. */
922 extern struct symbol *lookup_symbol_aux_block (const char *name,
923 const struct block *block,
924 const domain_enum domain);
926 extern struct symbol *lookup_language_this (const struct language_defn *lang,
927 const struct block *block);
929 /* Lookup a symbol only in the file static scope of all the objfiles. */
931 struct symbol *lookup_static_symbol_aux (const char *name,
932 const domain_enum domain);
935 /* lookup a symbol by name, within a specified block. */
937 extern struct symbol *lookup_block_symbol (const struct block *, const char *,
940 /* lookup a [struct, union, enum] by name, within a specified block. */
942 extern struct type *lookup_struct (const char *, struct block *);
944 extern struct type *lookup_union (const char *, struct block *);
946 extern struct type *lookup_enum (const char *, struct block *);
948 /* from blockframe.c: */
950 /* lookup the function symbol corresponding to the address. */
952 extern struct symbol *find_pc_function (CORE_ADDR);
954 /* lookup the function corresponding to the address and section. */
956 extern struct symbol *find_pc_sect_function (CORE_ADDR, struct obj_section *);
958 extern int find_pc_partial_function_gnu_ifunc (CORE_ADDR pc, char **name,
961 int *is_gnu_ifunc_p);
963 /* lookup function from address, return name, start addr and end addr. */
965 extern int find_pc_partial_function (CORE_ADDR, char **, CORE_ADDR *,
968 extern void clear_pc_function_cache (void);
970 /* lookup partial symbol table by address and section. */
972 extern struct symtab *find_pc_sect_symtab_via_partial (CORE_ADDR,
973 struct obj_section *);
975 /* lookup full symbol table by address. */
977 extern struct symtab *find_pc_symtab (CORE_ADDR);
979 /* lookup full symbol table by address and section. */
981 extern struct symtab *find_pc_sect_symtab (CORE_ADDR, struct obj_section *);
983 extern int find_pc_line_pc_range (CORE_ADDR, CORE_ADDR *, CORE_ADDR *);
985 extern void reread_symbols (void);
987 extern struct type *lookup_transparent_type (const char *);
988 extern struct type *basic_lookup_transparent_type (const char *);
991 /* Macro for name of symbol to indicate a file compiled with gcc. */
992 #ifndef GCC_COMPILED_FLAG_SYMBOL
993 #define GCC_COMPILED_FLAG_SYMBOL "gcc_compiled."
996 /* Macro for name of symbol to indicate a file compiled with gcc2. */
997 #ifndef GCC2_COMPILED_FLAG_SYMBOL
998 #define GCC2_COMPILED_FLAG_SYMBOL "gcc2_compiled."
1001 /* Functions for dealing with the minimal symbol table, really a misc
1002 address<->symbol mapping for things we don't have debug symbols for. */
1004 extern void prim_record_minimal_symbol (const char *, CORE_ADDR,
1005 enum minimal_symbol_type,
1008 extern struct minimal_symbol *prim_record_minimal_symbol_full
1009 (const char *, int, int, CORE_ADDR,
1010 enum minimal_symbol_type,
1011 int section, asection * bfd_section, struct objfile *);
1013 extern struct minimal_symbol *prim_record_minimal_symbol_and_info
1014 (const char *, CORE_ADDR,
1015 enum minimal_symbol_type,
1016 int section, asection * bfd_section, struct objfile *);
1018 extern unsigned int msymbol_hash_iw (const char *);
1020 extern unsigned int msymbol_hash (const char *);
1022 /* Compute the next hash value from previous HASH and the character C. This
1023 is only a GDB in-memory computed value with no external files compatibility
1026 #define SYMBOL_HASH_NEXT(hash, c) \
1027 ((hash) * 67 + tolower ((unsigned char) (c)) - 113)
1029 extern struct objfile * msymbol_objfile (struct minimal_symbol *sym);
1032 add_minsym_to_hash_table (struct minimal_symbol *sym,
1033 struct minimal_symbol **table);
1035 extern struct minimal_symbol *lookup_minimal_symbol (const char *,
1039 extern struct minimal_symbol *lookup_minimal_symbol_text (const char *,
1042 struct minimal_symbol *lookup_minimal_symbol_solib_trampoline (const char *,
1046 extern struct minimal_symbol *lookup_minimal_symbol_by_pc_name
1047 (CORE_ADDR, const char *, struct objfile *);
1049 extern struct minimal_symbol *lookup_minimal_symbol_by_pc (CORE_ADDR);
1051 extern int in_gnu_ifunc_stub (CORE_ADDR pc);
1053 /* Functions for resolving STT_GNU_IFUNC symbols which are implemented only
1054 for ELF symbol files. */
1056 struct gnu_ifunc_fns
1058 /* See elf_gnu_ifunc_resolve_addr for its real implementation. */
1059 CORE_ADDR (*gnu_ifunc_resolve_addr) (struct gdbarch *gdbarch, CORE_ADDR pc);
1061 /* See elf_gnu_ifunc_resolve_name for its real implementation. */
1062 int (*gnu_ifunc_resolve_name) (const char *function_name,
1063 CORE_ADDR *function_address_p);
1065 /* See elf_gnu_ifunc_resolver_stop for its real implementation. */
1066 void (*gnu_ifunc_resolver_stop) (struct breakpoint *b);
1068 /* See elf_gnu_ifunc_resolver_return_stop for its real implementation. */
1069 void (*gnu_ifunc_resolver_return_stop) (struct breakpoint *b);
1072 #define gnu_ifunc_resolve_addr gnu_ifunc_fns_p->gnu_ifunc_resolve_addr
1073 #define gnu_ifunc_resolve_name gnu_ifunc_fns_p->gnu_ifunc_resolve_name
1074 #define gnu_ifunc_resolver_stop gnu_ifunc_fns_p->gnu_ifunc_resolver_stop
1075 #define gnu_ifunc_resolver_return_stop \
1076 gnu_ifunc_fns_p->gnu_ifunc_resolver_return_stop
1078 extern const struct gnu_ifunc_fns *gnu_ifunc_fns_p;
1080 extern struct minimal_symbol *
1081 lookup_minimal_symbol_and_objfile (const char *,
1084 extern struct minimal_symbol
1085 *lookup_minimal_symbol_by_pc_section (CORE_ADDR, struct obj_section *);
1087 extern struct minimal_symbol
1088 *lookup_solib_trampoline_symbol_by_pc (CORE_ADDR);
1090 extern CORE_ADDR find_solib_trampoline_target (struct frame_info *, CORE_ADDR);
1092 extern void init_minimal_symbol_collection (void);
1094 extern struct cleanup *make_cleanup_discard_minimal_symbols (void);
1096 extern void install_minimal_symbols (struct objfile *);
1098 /* Sort all the minimal symbols in OBJFILE. */
1100 extern void msymbols_sort (struct objfile *objfile);
1102 struct symtab_and_line
1104 /* The program space of this sal. */
1105 struct program_space *pspace;
1107 struct symtab *symtab;
1108 struct obj_section *section;
1109 /* Line number. Line numbers start at 1 and proceed through symtab->nlines.
1110 0 is never a valid line number; it is used to indicate that line number
1111 information is not available. */
1120 extern void init_sal (struct symtab_and_line *sal);
1122 struct symtabs_and_lines
1124 struct symtab_and_line *sals;
1130 /* Some types and macros needed for exception catchpoints.
1131 Can't put these in target.h because symtab_and_line isn't
1132 known there. This file will be included by breakpoint.c,
1133 hppa-tdep.c, etc. */
1135 /* Enums for exception-handling support. */
1136 enum exception_event_kind
1144 /* Given a pc value, return line number it is in. Second arg nonzero means
1145 if pc is on the boundary use the previous statement's line number. */
1147 extern struct symtab_and_line find_pc_line (CORE_ADDR, int);
1149 /* Same function, but specify a section as well as an address. */
1151 extern struct symtab_and_line find_pc_sect_line (CORE_ADDR,
1152 struct obj_section *, int);
1154 /* Given a symtab and line number, return the pc there. */
1156 extern int find_line_pc (struct symtab *, int, CORE_ADDR *);
1158 extern int find_line_pc_range (struct symtab_and_line, CORE_ADDR *,
1161 extern void resolve_sal_pc (struct symtab_and_line *);
1163 /* Given a string, return the line specified by it. For commands like "list"
1164 and "breakpoint". */
1166 extern struct symtabs_and_lines decode_line_spec (char *, int);
1168 extern struct symtabs_and_lines decode_line_spec_1 (char *, int);
1172 void maintenance_print_symbols (char *, int);
1174 void maintenance_print_psymbols (char *, int);
1176 void maintenance_print_msymbols (char *, int);
1178 void maintenance_print_objfiles (char *, int);
1180 void maintenance_info_symtabs (char *, int);
1182 void maintenance_info_psymtabs (char *, int);
1184 void maintenance_check_symtabs (char *, int);
1188 void maintenance_print_statistics (char *, int);
1190 /* Symbol-reading stuff in symfile.c and solib.c. */
1192 extern void clear_solib (void);
1196 extern int identify_source_line (struct symtab *, int, int, CORE_ADDR);
1198 extern void print_source_lines (struct symtab *, int, int, int);
1200 extern void forget_cached_source_info_for_objfile (struct objfile *);
1201 extern void forget_cached_source_info (void);
1203 extern void select_source_symtab (struct symtab *);
1205 extern char **default_make_symbol_completion_list_break_on
1206 (char *text, char *word, const char *break_on);
1207 extern char **default_make_symbol_completion_list (char *, char *);
1208 extern char **make_symbol_completion_list (char *, char *);
1209 extern char **make_symbol_completion_list_fn (struct cmd_list_element *,
1212 extern char **make_file_symbol_completion_list (char *, char *, char *);
1214 extern char **make_source_files_completion_list (char *, char *);
1218 int matching_obj_sections (struct obj_section *, struct obj_section *);
1220 extern const char *find_main_filename (void);
1222 extern struct symtab *find_line_symtab (struct symtab *, int, int *, int *);
1224 extern struct symtab_and_line find_function_start_sal (struct symbol *sym,
1227 extern void skip_prologue_sal (struct symtab_and_line *);
1231 extern void clear_symtab_users (int add_flags);
1233 extern enum language deduce_language_from_filename (const char *);
1237 extern int in_prologue (struct gdbarch *gdbarch,
1238 CORE_ADDR pc, CORE_ADDR func_start);
1240 extern CORE_ADDR skip_prologue_using_sal (struct gdbarch *gdbarch,
1241 CORE_ADDR func_addr);
1243 extern struct symbol *fixup_symbol_section (struct symbol *,
1246 /* Symbol searching */
1248 /* When using search_symbols, a list of the following structs is returned.
1249 Callers must free the search list using free_search_symbols! */
1250 struct symbol_search
1252 /* The block in which the match was found. Could be, for example,
1253 STATIC_BLOCK or GLOBAL_BLOCK. */
1256 /* Information describing what was found.
1258 If symtab abd symbol are NOT NULL, then information was found
1260 struct symtab *symtab;
1261 struct symbol *symbol;
1263 /* If msymbol is non-null, then a match was made on something for
1264 which only minimal_symbols exist. */
1265 struct minimal_symbol *msymbol;
1267 /* A link to the next match, or NULL for the end. */
1268 struct symbol_search *next;
1271 extern void search_symbols (char *, enum search_domain, int, char **,
1272 struct symbol_search **);
1273 extern void free_search_symbols (struct symbol_search *);
1274 extern struct cleanup *make_cleanup_free_search_symbols (struct symbol_search
1277 /* The name of the ``main'' function.
1278 FIXME: cagney/2001-03-20: Can't make main_name() const since some
1279 of the calling code currently assumes that the string isn't
1281 extern void set_main_name (const char *name);
1282 extern /*const */ char *main_name (void);
1283 extern enum language language_of_main;
1285 /* Check global symbols in objfile. */
1286 struct symbol *lookup_global_symbol_from_objfile (const struct objfile *,
1288 const domain_enum domain);
1290 extern struct symtabs_and_lines expand_line_sal (struct symtab_and_line sal);
1292 /* Return 1 if the supplied producer string matches the ARM RealView
1293 compiler (armcc). */
1294 int producer_is_realview (const char *producer);
1296 void fixup_section (struct general_symbol_info *ginfo,
1297 CORE_ADDR addr, struct objfile *objfile);
1299 struct objfile *lookup_objfile_from_block (const struct block *block);
1301 #endif /* !defined(SYMTAB_H) */