/* Definitions for symbol file management in GDB.
- Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+ Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
+ Free Software Foundation, Inc.
-This file is part of GDB.
+ 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 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.
+ 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. */
+ 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. */
#if !defined (OBJFILES_H)
#define OBJFILES_H
To use this method, define your FRAME_CHAIN_VALID macro like:
- #define FRAME_CHAIN_VALID(chain, thisframe) \
- (chain != 0 \
- && !(inside_main_func ((thisframe)->pc)) \
- && !(inside_entry_func ((thisframe)->pc)))
+ #define FRAME_CHAIN_VALID(chain, thisframe) \
+ (chain != 0 \
+ && !(inside_main_func ((thisframe)->pc)) \
+ && !(inside_entry_func ((thisframe)->pc)))
and add initializations of the four scope controlling variables inside
the object file / debugging information processing modules. */
struct entry_info
-{
-
- /* The value we should use for this objects entry point.
- The illegal/unknown value needs to be something other than 0, ~0
- for instance, which is much less likely than 0. */
+ {
- CORE_ADDR entry_point;
+ /* The value we should use for this objects entry point.
+ The illegal/unknown value needs to be something other than 0, ~0
+ for instance, which is much less likely than 0. */
-#define INVALID_ENTRY_POINT (~0) /* ~0 will not be in any file, we hope. */
+ CORE_ADDR entry_point;
- /* Start (inclusive) and end (exclusive) of function containing the
- entry point. */
+#define INVALID_ENTRY_POINT (~0) /* ~0 will not be in any file, we hope. */
- CORE_ADDR entry_func_lowpc;
- CORE_ADDR entry_func_highpc;
+ /* Start (inclusive) and end (exclusive) of function containing the
+ entry point. */
- /* Start (inclusive) and end (exclusive) of object file containing the
- entry point. */
-
- CORE_ADDR entry_file_lowpc;
- CORE_ADDR entry_file_highpc;
+ CORE_ADDR entry_func_lowpc;
+ CORE_ADDR entry_func_highpc;
- /* Start (inclusive) and end (exclusive) of the user code main() function. */
+ /* Start (inclusive) and end (exclusive) of object file containing the
+ entry point. */
- CORE_ADDR main_func_lowpc;
- CORE_ADDR main_func_highpc;
+ CORE_ADDR entry_file_lowpc;
+ CORE_ADDR entry_file_highpc;
+
+ /* Start (inclusive) and end (exclusive) of the user code main() function. */
+
+ CORE_ADDR main_func_lowpc;
+ CORE_ADDR main_func_highpc;
/* Use these values when any of the above ranges is invalid. */
#define INVALID_ENTRY_LOWPC (3)
#define INVALID_ENTRY_HIGHPC (1)
-};
+ };
/* Sections in an objfile.
I'm not sure this could or should be changed, however. */
-struct obj_section {
- CORE_ADDR addr; /* lowest address in section */
- CORE_ADDR endaddr; /* 1+highest address in section */
+struct obj_section
+ {
+ CORE_ADDR addr; /* lowest address in section */
+ CORE_ADDR endaddr; /* 1+highest address in section */
+
+ /* This field is being used for nefarious purposes by syms_from_objfile.
+ It is said to be redundant with section_offsets; it's not really being
+ used that way, however, it's some sort of hack I don't understand
+ and am not going to try to eliminate (yet, anyway). FIXME.
+
+ It was documented as "offset between (end)addr and actual memory
+ addresses", but that's not true; addr & endaddr are actual memory
+ addresses. */
+ CORE_ADDR offset;
+
+ sec_ptr the_bfd_section; /* BFD section pointer */
- /* This field is being used for nefarious purposes by syms_from_objfile.
- It is said to be redundant with section_offsets; it's not really being
- used that way, however, it's some sort of hack I don't understand
- and am not going to try to eliminate (yet, anyway). FIXME.
+ /* Objfile this section is part of. */
+ struct objfile *objfile;
- It was documented as "offset between (end)addr and actual memory
- addresses", but that's not true; addr & endaddr are actual memory
- addresses. */
- CORE_ADDR offset;
+ /* True if this "overlay section" is mapped into an "overlay region". */
+ int ovly_mapped;
+ };
- sec_ptr the_bfd_section; /* BFD section pointer */
+/* An import entry contains information about a symbol that
+ is used in this objfile but not defined in it, and so needs
+ to be imported from some other objfile */
+/* Currently we just store the name; no attributes. 1997-08-05 */
+typedef char *ImportEntry;
+
+
+/* An export entry contains information about a symbol that
+ is defined in this objfile and available for use in other
+ objfiles */
+typedef struct
+ {
+ char *name; /* name of exported symbol */
+ int address; /* offset subject to relocation */
+ /* Currently no other attributes 1997-08-05 */
+ }
+ExportEntry;
- /* Objfile this section is part of. */
- struct objfile *objfile;
-};
/* The "objstats" structure provides a place for gdb to record some
interesting information about its internal state at runtime, on a
per objfile basis, such as information about the number of symbols
read, size of string table (if any), etc. */
-#if MAINTENANCE_CMDS
-
-struct objstats {
- int n_minsyms; /* Number of minimal symbols read */
- int n_psyms; /* Number of partial symbols read */
- int n_syms; /* Number of full symbols read */
- int n_stabs; /* Number of ".stabs" read (if applicable) */
- int n_types; /* Number of types */
- int sz_strtab; /* Size of stringtable, (if applicable) */
-};
+struct objstats
+ {
+ int n_minsyms; /* Number of minimal symbols read */
+ int n_psyms; /* Number of partial symbols read */
+ int n_syms; /* Number of full symbols read */
+ int n_stabs; /* Number of ".stabs" read (if applicable) */
+ int n_types; /* Number of types */
+ int sz_strtab; /* Size of stringtable, (if applicable) */
+ };
#define OBJSTAT(objfile, expr) (objfile -> stats.expr)
#define OBJSTATS struct objstats stats
-extern void print_objfile_statistics PARAMS ((void));
-
-#else
-
-#define OBJSTAT(objfile, expr) /* Nothing */
-#define OBJSTATS /* Nothing */
+extern void print_objfile_statistics (void);
+extern void print_symbol_bcache_statistics (void);
-#endif /* MAINTENANCE_CMDS */
+/* Number of entries in the minimal symbol hash table. */
+#define MINIMAL_SYMBOL_HASH_SIZE 2039
/* Master structure for keeping track of each file from which
gdb reads symbols. There are several ways these get allocated: 1.
(see remote-vx.c). */
struct objfile
-{
+ {
+
+ /* All struct objfile's are chained together by their next pointers.
+ The global variable "object_files" points to the first link in this
+ chain.
+
+ FIXME: There is a problem here if the objfile is reusable, and if
+ multiple users are to be supported. The problem is that the objfile
+ list is linked through a member of the objfile struct itself, which
+ is only valid for one gdb process. The list implementation needs to
+ be changed to something like:
+
+ struct list {struct list *next; struct objfile *objfile};
+
+ where the list structure is completely maintained separately within
+ each gdb process. */
+
+ struct objfile *next;
+
+ /* The object file's name. Malloc'd; free it if you free this struct. */
+
+ char *name;
+
+ /* Some flag bits for this objfile. */
+
+ unsigned short flags;
- /* All struct objfile's are chained together by their next pointers.
- The global variable "object_files" points to the first link in this
- chain.
+ /* Each objfile points to a linked list of symtabs derived from this file,
+ one symtab structure for each compilation unit (source file). Each link
+ in the symtab list contains a backpointer to this objfile. */
- FIXME: There is a problem here if the objfile is reusable, and if
- multiple users are to be supported. The problem is that the objfile
- list is linked through a member of the objfile struct itself, which
- is only valid for one gdb process. The list implementation needs to
- be changed to something like:
+ struct symtab *symtabs;
- struct list {struct list *next; struct objfile *objfile};
+ /* Each objfile points to a linked list of partial symtabs derived from
+ this file, one partial symtab structure for each compilation unit
+ (source file). */
- where the list structure is completely maintained separately within
- each gdb process. */
+ struct partial_symtab *psymtabs;
- struct objfile *next;
+ /* List of freed partial symtabs, available for re-use */
- /* The object file's name. Malloc'd; free it if you free this struct. */
+ struct partial_symtab *free_psymtabs;
- char *name;
+ /* The object file's BFD. Can be null if the objfile contains only
+ minimal symbols, e.g. the run time common symbols for SunOS4. */
- /* Some flag bits for this objfile. */
+ bfd *obfd;
- unsigned short flags;
+ /* The modification timestamp of the object file, as of the last time
+ we read its symbols. */
- /* Each objfile points to a linked list of symtabs derived from this file,
- one symtab structure for each compilation unit (source file). Each link
- in the symtab list contains a backpointer to this objfile. */
+ long mtime;
- struct symtab *symtabs;
+ /* Obstacks to hold objects that should be freed when we load a new symbol
+ table from this object file. */
- /* Each objfile points to a linked list of partial symtabs derived from
- this file, one partial symtab structure for each compilation unit
- (source file). */
+ struct obstack psymbol_obstack; /* Partial symbols */
+ struct obstack symbol_obstack; /* Full symbols */
+ struct obstack type_obstack; /* Types */
- struct partial_symtab *psymtabs;
+ /* A byte cache where we can stash arbitrary "chunks" of bytes that
+ will not change. */
- /* List of freed partial symtabs, available for re-use */
+ struct bcache psymbol_cache; /* Byte cache for partial syms */
- struct partial_symtab *free_psymtabs;
+ /* Vectors of all partial symbols read in from file. The actual data
+ is stored in the psymbol_obstack. */
- /* The object file's BFD. Can be null if the objfile contains only
- minimal symbols, e.g. the run time common symbols for SunOS4. */
+ struct psymbol_allocation_list global_psymbols;
+ struct psymbol_allocation_list static_psymbols;
- bfd *obfd;
+ /* Each file contains a pointer to an array of minimal symbols for all
+ global symbols that are defined within the file. The array is terminated
+ by a "null symbol", one that has a NULL pointer for the name and a zero
+ value for the address. This makes it easy to walk through the array
+ when passed a pointer to somewhere in the middle of it. There is also
+ a count of the number of symbols, which does not include the terminating
+ null symbol. The array itself, as well as all the data that it points
+ to, should be allocated on the symbol_obstack for this file. */
- /* The modification timestamp of the object file, as of the last time
- we read its symbols. */
+ struct minimal_symbol *msymbols;
+ int minimal_symbol_count;
- long mtime;
+ /* This is a hash table used to index the minimal symbols by name. */
- /* Obstacks to hold objects that should be freed when we load a new symbol
- table from this object file. */
+ struct minimal_symbol *msymbol_hash[MINIMAL_SYMBOL_HASH_SIZE];
- struct obstack psymbol_obstack; /* Partial symbols */
- struct obstack symbol_obstack; /* Full symbols */
- struct obstack type_obstack; /* Types */
+ /* This hash table is used to index the minimal symbols by their
+ demangled names. */
- /* Vectors of all partial symbols read in from file. The actual data
- is stored in the psymbol_obstack. */
+ struct minimal_symbol *msymbol_demangled_hash[MINIMAL_SYMBOL_HASH_SIZE];
- struct psymbol_allocation_list global_psymbols;
- struct psymbol_allocation_list static_psymbols;
+ /* For object file formats which don't specify fundamental types, gdb
+ can create such types. For now, it maintains a vector of pointers
+ to these internally created fundamental types on a per objfile basis,
+ however it really should ultimately keep them on a per-compilation-unit
+ basis, to account for linkage-units that consist of a number of
+ compilation units that may have different fundamental types, such as
+ linking C modules with ADA modules, or linking C modules that are
+ compiled with 32-bit ints with C modules that are compiled with 64-bit
+ ints (not inherently evil with a smarter linker). */
- /* Each file contains a pointer to an array of minimal symbols for all
- global symbols that are defined within the file. The array is terminated
- by a "null symbol", one that has a NULL pointer for the name and a zero
- value for the address. This makes it easy to walk through the array
- when passed a pointer to somewhere in the middle of it. There is also
- a count of the number of symbols, which does not include the terminating
- null symbol. The array itself, as well as all the data that it points
- to, should be allocated on the symbol_obstack for this file. */
+ struct type **fundamental_types;
- struct minimal_symbol *msymbols;
- int minimal_symbol_count;
+ /* The mmalloc() malloc-descriptor for this objfile if we are using
+ the memory mapped malloc() package to manage storage for this objfile's
+ data. NULL if we are not. */
- /* For object file formats which don't specify fundamental types, gdb
- can create such types. For now, it maintains a vector of pointers
- to these internally created fundamental types on a per objfile basis,
- however it really should ultimately keep them on a per-compilation-unit
- basis, to account for linkage-units that consist of a number of
- compilation units that may have different fundamental types, such as
- linking C modules with ADA modules, or linking C modules that are
- compiled with 32-bit ints with C modules that are compiled with 64-bit
- ints (not inherently evil with a smarter linker). */
+ PTR md;
- struct type **fundamental_types;
+ /* The file descriptor that was used to obtain the mmalloc descriptor
+ for this objfile. If we call mmalloc_detach with the malloc descriptor
+ we should then close this file descriptor. */
- /* The mmalloc() malloc-descriptor for this objfile if we are using
- the memory mapped malloc() package to manage storage for this objfile's
- data. NULL if we are not. */
+ int mmfd;
- PTR md;
+ /* Structure which keeps track of functions that manipulate objfile's
+ of the same type as this objfile. I.E. the function to read partial
+ symbols for example. Note that this structure is in statically
+ allocated memory, and is shared by all objfiles that use the
+ object module reader of this type. */
- /* The file descriptor that was used to obtain the mmalloc descriptor
- for this objfile. If we call mmalloc_detach with the malloc descriptor
- we should then close this file descriptor. */
+ struct sym_fns *sf;
- int mmfd;
+ /* The per-objfile information about the entry point, the scope (file/func)
+ containing the entry point, and the scope of the user's main() func. */
- /* Structure which keeps track of functions that manipulate objfile's
- of the same type as this objfile. I.E. the function to read partial
- symbols for example. Note that this structure is in statically
- allocated memory, and is shared by all objfiles that use the
- object module reader of this type. */
+ struct entry_info ei;
- struct sym_fns *sf;
+ /* Information about stabs. Will be filled in with a dbx_symfile_info
+ struct by those readers that need it. */
- /* The per-objfile information about the entry point, the scope (file/func)
- containing the entry point, and the scope of the user's main() func. */
+ struct dbx_symfile_info *sym_stab_info;
- struct entry_info ei;
+ /* Hook for information for use by the symbol reader (currently used
+ for information shared by sym_init and sym_read). It is
+ typically a pointer to malloc'd memory. The symbol reader's finish
+ function is responsible for freeing the memory thusly allocated. */
- /* Information about stabs. Will be filled in with a dbx_symfile_info
- struct by those readers that need it. */
+ PTR sym_private;
- PTR sym_stab_info;
+ /* Hook for target-architecture-specific information. This must
+ point to memory allocated on one of the obstacks in this objfile,
+ so that it gets freed automatically when reading a new object
+ file. */
- /* Hook for information for use by the symbol reader (currently used
- for information shared by sym_init and sym_read). It is
- typically a pointer to malloc'd memory. The symbol reader's finish
- function is responsible for freeing the memory thusly allocated. */
+ PTR obj_private;
- PTR sym_private;
+ /* Set of relocation offsets to apply to each section.
+ Currently on the psymbol_obstack (which makes no sense, but I'm
+ not sure it's harming anything).
- /* Hook for target-architecture-specific information. This must
- point to memory allocated on one of the obstacks in this objfile,
- so that it gets freed automatically when reading a new object
- file. */
+ These offsets indicate that all symbols (including partial and
+ minimal symbols) which have been read have been relocated by this
+ much. Symbols which are yet to be read need to be relocated by
+ it. */
- PTR obj_private;
+ struct section_offsets *section_offsets;
+ int num_sections;
- /* Set of relocation offsets to apply to each section.
- Currently on the psymbol_obstack (which makes no sense, but I'm
- not sure it's harming anything).
+ /* Indexes in the section_offsets array. These are initialized by the
+ *_symfile_offsets() family of functions (som_symfile_offsets,
+ xcoff_symfile_offsets, default_symfile_offsets). In theory they
+ should correspond to the section indexes used by bfd for the
+ current objfile. The exception to this for the time being is the
+ SOM version. */
- These offsets indicate that all symbols (including partial and
- minimal symbols) which have been read have been relocated by this
- much. Symbols which are yet to be read need to be relocated by
- it. */
+ int sect_index_text;
+ int sect_index_data;
+ int sect_index_bss;
+ int sect_index_rodata;
- struct section_offsets *section_offsets;
- int num_sections;
+ /* These pointers are used to locate the section table, which
+ among other things, is used to map pc addresses into sections.
+ SECTIONS points to the first entry in the table, and
+ SECTIONS_END points to the first location past the last entry
+ in the table. Currently the table is stored on the
+ psymbol_obstack (which makes no sense, but I'm not sure it's
+ harming anything). */
- /* set of section begin and end addresses used to map pc addresses
- into sections. Currently on the psymbol_obstack (which makes no
- sense, but I'm not sure it's harming anything). */
+ struct obj_section
+ *sections, *sections_end;
- struct obj_section
- *sections,
- *sections_end;
+ /* two auxiliary fields, used to hold the fp of separate symbol files */
+ FILE *auxf1, *auxf2;
- /* two auxiliary fields, used to hold the fp of separate symbol files */
- FILE *auxf1, *auxf2;
+ /* Imported symbols */
+ ImportEntry *import_list;
+ int import_list_size;
- /* Place to stash various statistics about this objfile */
- OBJSTATS;
-};
+ /* Exported symbols */
+ ExportEntry *export_list;
+ int export_list_size;
+
+ /* Place to stash various statistics about this objfile */
+ OBJSTATS;
+ };
/* Defines for the objfile flag word. */
To avoid this penalty for normal object files, we use this flag,
whose setting is determined upon symbol table read in. */
-#define OBJF_REORDERED (2 << 1) /* Functions are reordered */
+#define OBJF_REORDERED (1 << 2) /* Functions are reordered */
+
+/* Distinguish between an objfile for a shared library and a "vanilla"
+ objfile. (If not set, the objfile may still actually be a solib.
+ This can happen if the user created the objfile by using the
+ add-symbol-file command. GDB doesn't in that situation actually
+ check whether the file is a solib. Rather, the target's
+ implementation of the solib interface is responsible for setting
+ this flag when noticing solibs used by an inferior.) */
+
+#define OBJF_SHARED (1 << 3) /* From a shared library */
+
+/* User requested that this objfile be read in it's entirety. */
+
+#define OBJF_READNOW (1 << 4) /* Immediate full read */
+
+/* This objfile was created because the user explicitly caused it
+ (e.g., used the add-symbol-file command). This bit offers a way
+ for run_command to remove old objfile entries which are no longer
+ valid (i.e., are associated with an old inferior), but to preserve
+ ones that the user explicitly loaded via the add-symbol-file
+ command. */
+
+#define OBJF_USERLOADED (1 << 5) /* User loaded */
/* The object file that the main symbol table was loaded from (e.g. the
argument to the "symbol-file" or "file" command). */
/* Declarations for functions defined in objfiles.c */
-extern struct objfile *
-allocate_objfile PARAMS ((bfd *, int));
+extern struct objfile *allocate_objfile (bfd *, int);
+
+extern int build_objfile_section_table (struct objfile *);
+
+extern void objfile_to_front (struct objfile *);
-extern int
-build_objfile_section_table PARAMS ((struct objfile *));
+extern void unlink_objfile (struct objfile *);
-extern void objfile_to_front PARAMS ((struct objfile *));
+extern void free_objfile (struct objfile *);
-extern void
-unlink_objfile PARAMS ((struct objfile *));
+extern struct cleanup *make_cleanup_free_objfile (struct objfile *);
-extern void
-free_objfile PARAMS ((struct objfile *));
+extern void free_all_objfiles (void);
-extern void
-free_all_objfiles PARAMS ((void));
+extern void objfile_relocate (struct objfile *, struct section_offsets *);
-extern void
-objfile_relocate PARAMS ((struct objfile *, struct section_offsets *));
+extern int have_partial_symbols (void);
-extern int
-have_partial_symbols PARAMS ((void));
+extern int have_full_symbols (void);
-extern int
-have_full_symbols PARAMS ((void));
+/* This operation deletes all objfile entries that represent solibs that
+ weren't explicitly loaded by the user, via e.g., the add-symbol-file
+ command.
+ */
+extern void objfile_purge_solibs (void);
/* Functions for dealing with the minimal symbol table, really a misc
address<->symbol mapping for things we don't have debug symbols for. */
-extern int
-have_minimal_symbols PARAMS ((void));
+extern int have_minimal_symbols (void);
-extern struct obj_section *
-find_pc_section PARAMS((CORE_ADDR pc));
+extern struct obj_section *find_pc_section (CORE_ADDR pc);
+
+extern struct obj_section *find_pc_sect_section (CORE_ADDR pc,
+ asection * section);
+
+extern int in_plt_section (CORE_ADDR, char *);
+
+extern int is_in_import_list (char *, struct objfile *);
/* Traverse all object files. ALL_OBJFILES_SAFE works even if you delete
the objfile during the traversal. */
if ((objfile)->msymbols) \
ALL_OBJFILE_MSYMBOLS (objfile, m)
-#endif /* !defined (OBJFILES_H) */
+#define ALL_OBJFILE_OSECTIONS(objfile, osect) \
+ for (osect = objfile->sections; osect < objfile->sections_end; osect++)
+
+#define ALL_OBJSECTIONS(objfile, osect) \
+ ALL_OBJFILES (objfile) \
+ ALL_OBJFILE_OSECTIONS (objfile, osect)
+
+#define SECT_OFF_DATA(objfile) \
+ ((objfile->sect_index_data == -1) \
+ ? (internal_error (__FILE__, __LINE__, "sect_index_data not initialized"), -1) \
+ : objfile->sect_index_data)
+
+#define SECT_OFF_RODATA(objfile) \
+ ((objfile->sect_index_rodata == -1) \
+ ? (internal_error (__FILE__, __LINE__, "sect_index_rodata not initialized"), -1) \
+ : objfile->sect_index_rodata)
+
+#define SECT_OFF_TEXT(objfile) \
+ ((objfile->sect_index_text == -1) \
+ ? (internal_error (__FILE__, __LINE__, "sect_index_text not initialized"), -1) \
+ : objfile->sect_index_text)
+
+/* Sometimes the .bss section is missing from the objfile, so we don't
+ want to die here. Let the users of SECT_OFF_BSS deal with an
+ uninitialized section index. */
+#define SECT_OFF_BSS(objfile) (objfile)->sect_index_bss
+
+#endif /* !defined (OBJFILES_H) */
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