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binutils-gdb/gdb/symtab.h
Doug Evans 422d65e705 * symtab.h (minimal_symbol): New member created_by_gdb. 
* elfread.c (elf_symtab_read): Set created_by_gdb for @plt minsym
	created by gdb.
	* symtab.c (lookup_symbol_in_objfile_from_linkage_name): New function.
	(search_symbols): Call it instead of lookup_symbol.
	Skip symbols created by gdb.  Only scan minsyms if nfiles == 0.

	testsuite:
	* gdb.base/info-fun.exp: New file.
	* gdb.base/info-fun.c: New file.
	* gdb.base/info-fun-solib.c: New file.
2012-06-19 00:53:35 +00:00

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/* Symbol table definitions for GDB.
Copyright (C) 1986, 1988-2004, 2007-2012 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/>. */
#if !defined (SYMTAB_H)
#define SYMTAB_H 1
#include "vec.h"
#include "gdb_vecs.h"
/* Opaque declarations. */
struct ui_file;
struct frame_info;
struct symbol;
struct obstack;
struct objfile;
struct block;
struct blockvector;
struct axs_value;
struct agent_expr;
struct program_space;
struct language_defn;
struct probe;
/* Some of the structures in this file are space critical.
The space-critical structures are:
struct general_symbol_info
struct symbol
struct partial_symbol
These structures are laid out to encourage good packing.
They use ENUM_BITFIELD and short int fields, and they order the
structure members so that fields less than a word are next
to each other so they can be packed together. */
/* Rearranged: used ENUM_BITFIELD and rearranged field order in
all the space critical structures (plus struct minimal_symbol).
Memory usage dropped from 99360768 bytes to 90001408 bytes.
I measured this with before-and-after tests of
"HEAD-old-gdb -readnow HEAD-old-gdb" and
"HEAD-new-gdb -readnow HEAD-old-gdb" on native i686-pc-linux-gnu,
red hat linux 8, with LD_LIBRARY_PATH=/usr/lib/debug,
typing "maint space 1" at the first command prompt.
Here is another measurement (from andrew c):
# no /usr/lib/debug, just plain glibc, like a normal user
gdb HEAD-old-gdb
(gdb) break internal_error
(gdb) run
(gdb) maint internal-error
(gdb) backtrace
(gdb) maint space 1
gdb gdb_6_0_branch 2003-08-19 space used: 8896512
gdb HEAD 2003-08-19 space used: 8904704
gdb HEAD 2003-08-21 space used: 8396800 (+symtab.h)
gdb HEAD 2003-08-21 space used: 8265728 (+gdbtypes.h)
The third line shows the savings from the optimizations in symtab.h.
The fourth line shows the savings from the optimizations in
gdbtypes.h. Both optimizations are in gdb HEAD now.
--chastain 2003-08-21 */
/* Struct for storing C++ specific information. Allocated when needed. */
struct cplus_specific
{
const char *demangled_name;
};
/* Define a structure for the information that is common to all symbol types,
including minimal symbols, partial symbols, and full symbols. In a
multilanguage environment, some language specific information may need to
be recorded along with each symbol. */
/* This structure is space critical. See space comments at the top. */
struct general_symbol_info
{
/* Name of the symbol. This is a required field. Storage for the
name is allocated on the objfile_obstack for the associated
objfile. For languages like C++ that make a distinction between
the mangled name and demangled name, this is the mangled
name. */
const char *name;
/* Value of the symbol. Which member of this union to use, and what
it means, depends on what kind of symbol this is and its
SYMBOL_CLASS. See comments there for more details. All of these
are in host byte order (though what they point to might be in
target byte order, e.g. LOC_CONST_BYTES). */
union
{
LONGEST ivalue;
struct block *block;
gdb_byte *bytes;
CORE_ADDR address;
/* For opaque typedef struct chain. */
struct symbol *chain;
}
value;
/* Since one and only one language can apply, wrap the language specific
information inside a union. */
union
{
/* This is used by languages which wish to store a demangled name.
currently used by Ada, Java, and Objective C. */
struct mangled_lang
{
const char *demangled_name;
}
mangled_lang;
struct cplus_specific *cplus_specific;
}
language_specific;
/* Record the source code language that applies to this symbol.
This is used to select one of the fields from the language specific
union above. */
ENUM_BITFIELD(language) language : 8;
/* Which section is this symbol in? This is an index into
section_offsets for this objfile. Negative means that the symbol
does not get relocated relative to a section.
Disclaimer: currently this is just used for xcoff, so don't
expect all symbol-reading code to set it correctly (the ELF code
also tries to set it correctly). */
short section;
/* The section associated with this symbol. It can be NULL. */
struct obj_section *obj_section;
};
extern void symbol_set_demangled_name (struct general_symbol_info *, char *,
struct objfile *);
extern const char *symbol_get_demangled_name
(const struct general_symbol_info *);
extern CORE_ADDR symbol_overlayed_address (CORE_ADDR, struct obj_section *);
/* Note that all the following SYMBOL_* macros are used with the
SYMBOL argument being either a partial symbol, a minimal symbol or
a full symbol. All three types have a ginfo field. In particular
the SYMBOL_SET_LANGUAGE, SYMBOL_DEMANGLED_NAME, etc.
macros cannot be entirely substituted by
functions, unless the callers are changed to pass in the ginfo
field only, instead of the SYMBOL parameter. */
#define SYMBOL_VALUE(symbol) (symbol)->ginfo.value.ivalue
#define SYMBOL_VALUE_ADDRESS(symbol) (symbol)->ginfo.value.address
#define SYMBOL_VALUE_BYTES(symbol) (symbol)->ginfo.value.bytes
#define SYMBOL_BLOCK_VALUE(symbol) (symbol)->ginfo.value.block
#define SYMBOL_VALUE_CHAIN(symbol) (symbol)->ginfo.value.chain
#define SYMBOL_LANGUAGE(symbol) (symbol)->ginfo.language
#define SYMBOL_SECTION(symbol) (symbol)->ginfo.section
#define SYMBOL_OBJ_SECTION(symbol) (symbol)->ginfo.obj_section
/* Initializes the language dependent portion of a symbol
depending upon the language for the symbol. */
#define SYMBOL_SET_LANGUAGE(symbol,language) \
(symbol_set_language (&(symbol)->ginfo, (language)))
extern void symbol_set_language (struct general_symbol_info *symbol,
enum language language);
/* Set just the linkage name of a symbol; do not try to demangle
it. Used for constructs which do not have a mangled name,
e.g. struct tags. Unlike SYMBOL_SET_NAMES, linkage_name must
be terminated and either already on the objfile's obstack or
permanently allocated. */
#define SYMBOL_SET_LINKAGE_NAME(symbol,linkage_name) \
(symbol)->ginfo.name = (linkage_name)
/* Set the linkage and natural names of a symbol, by demangling
the linkage name. */
#define SYMBOL_SET_NAMES(symbol,linkage_name,len,copy_name,objfile) \
symbol_set_names (&(symbol)->ginfo, linkage_name, len, copy_name, objfile)
extern void symbol_set_names (struct general_symbol_info *symbol,
const char *linkage_name, int len, int copy_name,
struct objfile *objfile);
/* Now come lots of name accessor macros. Short version as to when to
use which: Use SYMBOL_NATURAL_NAME to refer to the name of the
symbol in the original source code. Use SYMBOL_LINKAGE_NAME if you
want to know what the linker thinks the symbol's name is. Use
SYMBOL_PRINT_NAME for output. Use SYMBOL_DEMANGLED_NAME if you
specifically need to know whether SYMBOL_NATURAL_NAME and
SYMBOL_LINKAGE_NAME are different. */
/* Return SYMBOL's "natural" name, i.e. the name that it was called in
the original source code. In languages like C++ where symbols may
be mangled for ease of manipulation by the linker, this is the
demangled name. */
#define SYMBOL_NATURAL_NAME(symbol) \
(symbol_natural_name (&(symbol)->ginfo))
extern const char *symbol_natural_name
(const struct general_symbol_info *symbol);
/* Return SYMBOL's name from the point of view of the linker. In
languages like C++ where symbols may be mangled for ease of
manipulation by the linker, this is the mangled name; otherwise,
it's the same as SYMBOL_NATURAL_NAME. */
#define SYMBOL_LINKAGE_NAME(symbol) (symbol)->ginfo.name
/* Return the demangled name for a symbol based on the language for
that symbol. If no demangled name exists, return NULL. */
#define SYMBOL_DEMANGLED_NAME(symbol) \
(symbol_demangled_name (&(symbol)->ginfo))
extern const char *symbol_demangled_name
(const struct general_symbol_info *symbol);
/* Macro that returns a version of the name of a symbol that is
suitable for output. In C++ this is the "demangled" form of the
name if demangle is on and the "mangled" form of the name if
demangle is off. In other languages this is just the symbol name.
The result should never be NULL. Don't use this for internal
purposes (e.g. storing in a hashtable): it's only suitable for output.
N.B. symbol may be anything with a ginfo member,
e.g., struct symbol or struct minimal_symbol. */
#define SYMBOL_PRINT_NAME(symbol) \
(demangle ? SYMBOL_NATURAL_NAME (symbol) : SYMBOL_LINKAGE_NAME (symbol))
extern int demangle;
/* Macro that returns the name to be used when sorting and searching symbols.
In C++, Chill, and Java, we search for the demangled form of a name,
and so sort symbols accordingly. In Ada, however, we search by mangled
name. If there is no distinct demangled name, then SYMBOL_SEARCH_NAME
returns the same value (same pointer) as SYMBOL_LINKAGE_NAME. */
#define SYMBOL_SEARCH_NAME(symbol) \
(symbol_search_name (&(symbol)->ginfo))
extern const char *symbol_search_name (const struct general_symbol_info *);
/* Return non-zero if NAME matches the "search" name of SYMBOL.
Whitespace and trailing parentheses are ignored.
See strcmp_iw for details about its behavior. */
#define SYMBOL_MATCHES_SEARCH_NAME(symbol, name) \
(strcmp_iw (SYMBOL_SEARCH_NAME (symbol), (name)) == 0)
/* Classification types for a minimal symbol. These should be taken as
"advisory only", since if gdb can't easily figure out a
classification it simply selects mst_unknown. It may also have to
guess when it can't figure out which is a better match between two
types (mst_data versus mst_bss) for example. Since the minimal
symbol info is sometimes derived from the BFD library's view of a
file, we need to live with what information bfd supplies. */
enum minimal_symbol_type
{
mst_unknown = 0, /* Unknown type, the default */
mst_text, /* Generally executable instructions */
mst_text_gnu_ifunc, /* Executable code returning address
of executable code */
mst_slot_got_plt, /* GOT entries for .plt sections */
mst_data, /* Generally initialized data */
mst_bss, /* Generally uninitialized data */
mst_abs, /* Generally absolute (nonrelocatable) */
/* GDB uses mst_solib_trampoline for the start address of a shared
library trampoline entry. Breakpoints for shared library functions
are put there if the shared library is not yet loaded.
After the shared library is loaded, lookup_minimal_symbol will
prefer the minimal symbol from the shared library (usually
a mst_text symbol) over the mst_solib_trampoline symbol, and the
breakpoints will be moved to their true address in the shared
library via breakpoint_re_set. */
mst_solib_trampoline, /* Shared library trampoline code */
/* For the mst_file* types, the names are only guaranteed to be unique
within a given .o file. */
mst_file_text, /* Static version of mst_text */
mst_file_data, /* Static version of mst_data */
mst_file_bss /* Static version of mst_bss */
};
/* Define a simple structure used to hold some very basic information about
all defined global symbols (text, data, bss, abs, etc). The only required
information is the general_symbol_info.
In many cases, even if a file was compiled with no special options for
debugging at all, as long as was not stripped it will contain sufficient
information to build a useful minimal symbol table using this structure.
Even when a file contains enough debugging information to build a full
symbol table, these minimal symbols are still useful for quickly mapping
between names and addresses, and vice versa. They are also sometimes
used to figure out what full symbol table entries need to be read in. */
struct minimal_symbol
{
/* The general symbol info required for all types of symbols.
The SYMBOL_VALUE_ADDRESS contains the address that this symbol
corresponds to. */
struct general_symbol_info ginfo;
/* Size of this symbol. end_psymtab in dbxread.c uses this
information to calculate the end of the partial symtab based on the
address of the last symbol plus the size of the last symbol. */
unsigned long size;
/* Which source file is this symbol in? Only relevant for mst_file_*. */
const char *filename;
/* Classification type for this minimal symbol. */
ENUM_BITFIELD(minimal_symbol_type) type : 8;
/* Non-zero if this symbol was created by gdb.
Such symbols do not appear in the output of "info var|fun". */
unsigned int created_by_gdb : 1;
/* Two flag bits provided for the use of the target. */
unsigned int target_flag_1 : 1;
unsigned int target_flag_2 : 1;
/* Minimal symbols with the same hash key are kept on a linked
list. This is the link. */
struct minimal_symbol *hash_next;
/* Minimal symbols are stored in two different hash tables. This is
the `next' pointer for the demangled hash table. */
struct minimal_symbol *demangled_hash_next;
};
#define MSYMBOL_TARGET_FLAG_1(msymbol) (msymbol)->target_flag_1
#define MSYMBOL_TARGET_FLAG_2(msymbol) (msymbol)->target_flag_2
#define MSYMBOL_SIZE(msymbol) (msymbol)->size
#define MSYMBOL_TYPE(msymbol) (msymbol)->type
#include "minsyms.h"
/* Represent one symbol name; a variable, constant, function or typedef. */
/* Different name domains for symbols. Looking up a symbol specifies a
domain and ignores symbol definitions in other name domains. */
typedef enum domain_enum_tag
{
/* UNDEF_DOMAIN is used when a domain has not been discovered or
none of the following apply. This usually indicates an error either
in the symbol information or in gdb's handling of symbols. */
UNDEF_DOMAIN,
/* VAR_DOMAIN is the usual domain. In C, this contains variables,
function names, typedef names and enum type values. */
VAR_DOMAIN,
/* STRUCT_DOMAIN is used in C to hold struct, union and enum type names.
Thus, if `struct foo' is used in a C program, it produces a symbol named
`foo' in the STRUCT_DOMAIN. */
STRUCT_DOMAIN,
/* LABEL_DOMAIN may be used for names of labels (for gotos). */
LABEL_DOMAIN
} domain_enum;
/* Searching domains, used for `search_symbols'. Element numbers are
hardcoded in GDB, check all enum uses before changing it. */
enum search_domain
{
/* Everything in VAR_DOMAIN minus FUNCTIONS_DOMAIN and
TYPES_DOMAIN. */
VARIABLES_DOMAIN = 0,
/* All functions -- for some reason not methods, though. */
FUNCTIONS_DOMAIN = 1,
/* All defined types */
TYPES_DOMAIN = 2,
/* Any type. */
ALL_DOMAIN = 3
};
/* An address-class says where to find the value of a symbol. */
enum address_class
{
/* Not used; catches errors. */
LOC_UNDEF,
/* Value is constant int SYMBOL_VALUE, host byteorder. */
LOC_CONST,
/* Value is at fixed address SYMBOL_VALUE_ADDRESS. */
LOC_STATIC,
/* Value is in register. SYMBOL_VALUE is the register number
in the original debug format. SYMBOL_REGISTER_OPS holds a
function that can be called to transform this into the
actual register number this represents in a specific target
architecture (gdbarch).
For some symbol formats (stabs, for some compilers at least),
the compiler generates two symbols, an argument and a register.
In some cases we combine them to a single LOC_REGISTER in symbol
reading, but currently not for all cases (e.g. it's passed on the
stack and then loaded into a register). */
LOC_REGISTER,
/* It's an argument; the value is at SYMBOL_VALUE offset in arglist. */
LOC_ARG,
/* Value address is at SYMBOL_VALUE offset in arglist. */
LOC_REF_ARG,
/* Value is in specified register. Just like LOC_REGISTER except the
register holds the address of the argument instead of the argument
itself. This is currently used for the passing of structs and unions
on sparc and hppa. It is also used for call by reference where the
address is in a register, at least by mipsread.c. */
LOC_REGPARM_ADDR,
/* Value is a local variable at SYMBOL_VALUE offset in stack frame. */
LOC_LOCAL,
/* Value not used; definition in SYMBOL_TYPE. Symbols in the domain
STRUCT_DOMAIN all have this class. */
LOC_TYPEDEF,
/* Value is address SYMBOL_VALUE_ADDRESS in the code. */
LOC_LABEL,
/* In a symbol table, value is SYMBOL_BLOCK_VALUE of a `struct block'.
In a partial symbol table, SYMBOL_VALUE_ADDRESS is the start address
of the block. Function names have this class. */
LOC_BLOCK,
/* Value is a constant byte-sequence pointed to by SYMBOL_VALUE_BYTES, in
target byte order. */
LOC_CONST_BYTES,
/* Value is at fixed address, but the address of the variable has
to be determined from the minimal symbol table whenever the
variable is referenced.
This happens if debugging information for a global symbol is
emitted and the corresponding minimal symbol is defined
in another object file or runtime common storage.
The linker might even remove the minimal symbol if the global
symbol is never referenced, in which case the symbol remains
unresolved.
GDB would normally find the symbol in the minimal symbol table if it will
not find it in the full symbol table. But a reference to an external
symbol in a local block shadowing other definition requires full symbol
without possibly having its address available for LOC_STATIC. Testcase
is provided as `gdb.dwarf2/dw2-unresolved.exp'. */
LOC_UNRESOLVED,
/* The variable does not actually exist in the program.
The value is ignored. */
LOC_OPTIMIZED_OUT,
/* The variable's address is computed by a set of location
functions (see "struct symbol_computed_ops" below). */
LOC_COMPUTED,
};
/* The methods needed to implement LOC_COMPUTED. These methods can
use the symbol's .aux_value for additional per-symbol information.
At present this is only used to implement location expressions. */
struct symbol_computed_ops
{
/* Return the value of the variable SYMBOL, relative to the stack
frame FRAME. If the variable has been optimized out, return
zero.
Iff `read_needs_frame (SYMBOL)' is zero, then FRAME may be zero. */
struct value *(*read_variable) (struct symbol * symbol,
struct frame_info * frame);
/* Read variable SYMBOL like read_variable at (callee) FRAME's function
entry. SYMBOL should be a function parameter, otherwise
NO_ENTRY_VALUE_ERROR will be thrown. */
struct value *(*read_variable_at_entry) (struct symbol *symbol,
struct frame_info *frame);
/* Return non-zero if we need a frame to find the value of the SYMBOL. */
int (*read_needs_frame) (struct symbol * symbol);
/* Write to STREAM a natural-language description of the location of
SYMBOL, in the context of ADDR. */
void (*describe_location) (struct symbol * symbol, CORE_ADDR addr,
struct ui_file * stream);
/* Tracepoint support. Append bytecodes to the tracepoint agent
expression AX that push the address of the object SYMBOL. Set
VALUE appropriately. Note --- for objects in registers, this
needn't emit any code; as long as it sets VALUE properly, then
the caller will generate the right code in the process of
treating this as an lvalue or rvalue. */
void (*tracepoint_var_ref) (struct symbol *symbol, struct gdbarch *gdbarch,
struct agent_expr *ax, struct axs_value *value);
};
/* Functions used with LOC_REGISTER and LOC_REGPARM_ADDR. */
struct symbol_register_ops
{
int (*register_number) (struct symbol *symbol, struct gdbarch *gdbarch);
};
/* This structure is space critical. See space comments at the top. */
struct symbol
{
/* The general symbol info required for all types of symbols. */
struct general_symbol_info ginfo;
/* Data type of value */
struct type *type;
/* The symbol table containing this symbol. This is the file
associated with LINE. It can be NULL during symbols read-in but it is
never NULL during normal operation. */
struct symtab *symtab;
/* Domain code. */
ENUM_BITFIELD(domain_enum_tag) domain : 6;
/* Address class */
/* NOTE: cagney/2003-11-02: The fields "aclass" and "ops" contain
overlapping information. By creating a per-aclass ops vector, or
using the aclass as an index into an ops table, the aclass and
ops fields can be merged. The latter, for instance, would shave
32-bits from each symbol (relative to a symbol lookup, any table
index overhead would be in the noise). */
ENUM_BITFIELD(address_class) aclass : 6;
/* Whether this is an argument. */
unsigned is_argument : 1;
/* Whether this is an inlined function (class LOC_BLOCK only). */
unsigned is_inlined : 1;
/* True if this is a C++ function symbol with template arguments.
In this case the symbol is really a "struct template_symbol". */
unsigned is_cplus_template_function : 1;
/* Line number of this symbol's definition, except for inlined
functions. For an inlined function (class LOC_BLOCK and
SYMBOL_INLINED set) this is the line number of the function's call
site. Inlined function symbols are not definitions, and they are
never found by symbol table lookup.
FIXME: Should we really make the assumption that nobody will try
to debug files longer than 64K lines? What about machine
generated programs? */
unsigned short line;
/* Method's for symbol's of this class. */
/* NOTE: cagney/2003-11-02: See comment above attached to "aclass". */
union
{
/* Used with LOC_COMPUTED. */
const struct symbol_computed_ops *ops_computed;
/* Used with LOC_REGISTER and LOC_REGPARM_ADDR. */
const struct symbol_register_ops *ops_register;
} ops;
/* An arbitrary data pointer, allowing symbol readers to record
additional information on a per-symbol basis. Note that this data
must be allocated using the same obstack as the symbol itself. */
/* So far it is only used by LOC_COMPUTED to
find the location information. For a LOC_BLOCK symbol
for a function in a compilation unit compiled with DWARF 2
information, this is information used internally by the DWARF 2
code --- specifically, the location expression for the frame
base for this function. */
/* FIXME drow/2003-02-21: For the LOC_BLOCK case, it might be better
to add a magic symbol to the block containing this information,
or to have a generic debug info annotation slot for symbols. */
void *aux_value;
struct symbol *hash_next;
};
#define SYMBOL_DOMAIN(symbol) (symbol)->domain
#define SYMBOL_CLASS(symbol) (symbol)->aclass
#define SYMBOL_IS_ARGUMENT(symbol) (symbol)->is_argument
#define SYMBOL_INLINED(symbol) (symbol)->is_inlined
#define SYMBOL_IS_CPLUS_TEMPLATE_FUNCTION(symbol) \
(symbol)->is_cplus_template_function
#define SYMBOL_TYPE(symbol) (symbol)->type
#define SYMBOL_LINE(symbol) (symbol)->line
#define SYMBOL_SYMTAB(symbol) (symbol)->symtab
#define SYMBOL_COMPUTED_OPS(symbol) (symbol)->ops.ops_computed
#define SYMBOL_REGISTER_OPS(symbol) (symbol)->ops.ops_register
#define SYMBOL_LOCATION_BATON(symbol) (symbol)->aux_value
/* An instance of this type is used to represent a C++ template
function. It includes a "struct symbol" as a kind of base class;
users downcast to "struct template_symbol *" when needed. A symbol
is really of this type iff SYMBOL_IS_CPLUS_TEMPLATE_FUNCTION is
true. */
struct template_symbol
{
/* The base class. */
struct symbol base;
/* The number of template arguments. */
int n_template_arguments;
/* The template arguments. This is an array with
N_TEMPLATE_ARGUMENTS elements. */
struct symbol **template_arguments;
};
/* Each item represents a line-->pc (or the reverse) mapping. This is
somewhat more wasteful of space than one might wish, but since only
the files which are actually debugged are read in to core, we don't
waste much space. */
struct linetable_entry
{
int line;
CORE_ADDR pc;
};
/* The order of entries in the linetable is significant. They should
be sorted by increasing values of the pc field. If there is more than
one entry for a given pc, then I'm not sure what should happen (and
I not sure whether we currently handle it the best way).
Example: a C for statement generally looks like this
10 0x100 - for the init/test part of a for stmt.
20 0x200
30 0x300
10 0x400 - for the increment part of a for stmt.
If an entry has a line number of zero, it marks the start of a PC
range for which no line number information is available. It is
acceptable, though wasteful of table space, for such a range to be
zero length. */
struct linetable
{
int nitems;
/* Actually NITEMS elements. If you don't like this use of the
`struct hack', you can shove it up your ANSI (seriously, if the
committee tells us how to do it, we can probably go along). */
struct linetable_entry item[1];
};
/* How to relocate the symbols from each section in a symbol file.
Each struct contains an array of offsets.
The ordering and meaning of the offsets is file-type-dependent;
typically it is indexed by section numbers or symbol types or
something like that.
To give us flexibility in changing the internal representation
of these offsets, the ANOFFSET macro must be used to insert and
extract offset values in the struct. */
struct section_offsets
{
CORE_ADDR offsets[1]; /* As many as needed. */
};
#define ANOFFSET(secoff, whichone) \
((whichone == -1) \
? (internal_error (__FILE__, __LINE__, \
_("Section index is uninitialized")), -1) \
: secoff->offsets[whichone])
/* The size of a section_offsets table for N sections. */
#define SIZEOF_N_SECTION_OFFSETS(n) \
(sizeof (struct section_offsets) \
+ sizeof (((struct section_offsets *) 0)->offsets) * ((n)-1))
/* Each source file or header is represented by a struct symtab.
These objects are chained through the `next' field. */
struct symtab
{
/* Unordered chain of all existing symtabs of this objfile. */
struct symtab *next;
/* List of all symbol scope blocks for this symtab. May be shared
between different symtabs (and normally is for all the symtabs
in a given compilation unit). */
struct blockvector *blockvector;
/* Table mapping core addresses to line numbers for this file.
Can be NULL if none. Never shared between different symtabs. */
struct linetable *linetable;
/* Section in objfile->section_offsets for the blockvector and
the linetable. Probably always SECT_OFF_TEXT. */
int block_line_section;
/* If several symtabs share a blockvector, exactly one of them
should be designated the primary, so that the blockvector
is relocated exactly once by objfile_relocate. */
unsigned int primary : 1;
/* Symtab has been compiled with both optimizations and debug info so that
GDB may stop skipping prologues as variables locations are valid already
at function entry points. */
unsigned int locations_valid : 1;
/* DWARF unwinder for this CU is valid even for epilogues (PC at the return
instruction). This is supported by GCC since 4.5.0. */
unsigned int epilogue_unwind_valid : 1;
/* The macro table for this symtab. Like the blockvector, this
may be shared between different symtabs --- and normally is for
all the symtabs in a given compilation unit. */
struct macro_table *macro_table;
/* Name of this source file. */
char *filename;
/* Directory in which it was compiled, or NULL if we don't know. */
char *dirname;
/* Total number of lines found in source file. */
int nlines;
/* line_charpos[N] is the position of the (N-1)th line of the
source file. "position" means something we can lseek() to; it
is not guaranteed to be useful any other way. */
int *line_charpos;
/* Language of this source file. */
enum language language;
/* String that identifies the format of the debugging information, such
as "stabs", "dwarf 1", "dwarf 2", "coff", etc. This is mostly useful
for automated testing of gdb but may also be information that is
useful to the user. */
const char *debugformat;
/* String of producer version information. May be zero. */
const char *producer;
/* Full name of file as found by searching the source path.
NULL if not yet known. */
char *fullname;
/* Object file from which this symbol information was read. */
struct objfile *objfile;
/* struct call_site entries for this compilation unit or NULL. */
htab_t call_site_htab;
/* If non-NULL, then this points to a NULL-terminated vector of
included symbol tables. When searching the static or global
block of this symbol table, the corresponding block of all
included symbol tables will also be searched. Note that this
list must be flattened -- the symbol reader is responsible for
ensuring that this vector contains the transitive closure of all
included symbol tables. */
struct symtab **includes;
/* If this is an included symbol table, this points to one includer
of the table. This user is considered the canonical symbol table
containing this one. An included symbol table may itself be
included by another. */
struct symtab *user;
};
#define BLOCKVECTOR(symtab) (symtab)->blockvector
#define LINETABLE(symtab) (symtab)->linetable
#define SYMTAB_PSPACE(symtab) (symtab)->objfile->pspace
/* The virtual function table is now an array of structures which have the
form { int16 offset, delta; void *pfn; }.
In normal virtual function tables, OFFSET is unused.
DELTA is the amount which is added to the apparent object's base
address in order to point to the actual object to which the
virtual function should be applied.
PFN is a pointer to the virtual function.
Note that this macro is g++ specific (FIXME). */
#define VTBL_FNADDR_OFFSET 2
/* External variables and functions for the objects described above. */
/* True if we are nested inside psymtab_to_symtab. */
extern int currently_reading_symtab;
/* symtab.c lookup functions */
extern const char multiple_symbols_ask[];
extern const char multiple_symbols_all[];
extern const char multiple_symbols_cancel[];
const char *multiple_symbols_select_mode (void);
int symbol_matches_domain (enum language symbol_language,
domain_enum symbol_domain,
domain_enum domain);
/* lookup a symbol table by source file name. */
extern struct symtab *lookup_symtab (const char *);
/* lookup a symbol by name (optional block) in language. */
extern struct symbol *lookup_symbol_in_language (const char *,
const struct block *,
const domain_enum,
enum language,
int *);
/* lookup a symbol by name (optional block, optional symtab)
in the current language. */
extern struct symbol *lookup_symbol (const char *, const struct block *,
const domain_enum, int *);
/* A default version of lookup_symbol_nonlocal for use by languages
that can't think of anything better to do. */
extern struct symbol *basic_lookup_symbol_nonlocal (const char *,
const struct block *,
const domain_enum);
/* Some helper functions for languages that need to write their own
lookup_symbol_nonlocal functions. */
/* Lookup a symbol in the static block associated to BLOCK, if there
is one; do nothing if BLOCK is NULL or a global block. */
extern struct symbol *lookup_symbol_static (const char *name,
const struct block *block,
const domain_enum domain);
/* Lookup a symbol in all files' global blocks (searching psymtabs if
necessary). */
extern struct symbol *lookup_symbol_global (const char *name,
const struct block *block,
const domain_enum domain);
/* Lookup a symbol within the block BLOCK. This, unlike
lookup_symbol_block, will set SYMTAB and BLOCK_FOUND correctly, and
will fix up the symbol if necessary. */
extern struct symbol *lookup_symbol_aux_block (const char *name,
const struct block *block,
const domain_enum domain);
extern struct symbol *lookup_language_this (const struct language_defn *lang,
const struct block *block);
/* Lookup a symbol only in the file static scope of all the objfiles. */
struct symbol *lookup_static_symbol_aux (const char *name,
const domain_enum domain);
/* lookup a symbol by name, within a specified block. */
extern struct symbol *lookup_block_symbol (const struct block *, const char *,
const domain_enum);
/* lookup a [struct, union, enum] by name, within a specified block. */
extern struct type *lookup_struct (const char *, struct block *);
extern struct type *lookup_union (const char *, struct block *);
extern struct type *lookup_enum (const char *, struct block *);
/* from blockframe.c: */
/* lookup the function symbol corresponding to the address. */
extern struct symbol *find_pc_function (CORE_ADDR);
/* lookup the function corresponding to the address and section. */
extern struct symbol *find_pc_sect_function (CORE_ADDR, struct obj_section *);
extern int find_pc_partial_function_gnu_ifunc (CORE_ADDR pc, const char **name,
CORE_ADDR *address,
CORE_ADDR *endaddr,
int *is_gnu_ifunc_p);
/* lookup function from address, return name, start addr and end addr. */
extern int find_pc_partial_function (CORE_ADDR, const char **, CORE_ADDR *,
CORE_ADDR *);
extern void clear_pc_function_cache (void);
/* lookup partial symbol table by address and section. */
extern struct symtab *find_pc_sect_symtab_via_partial (CORE_ADDR,
struct obj_section *);
/* lookup full symbol table by address. */
extern struct symtab *find_pc_symtab (CORE_ADDR);
/* lookup full symbol table by address and section. */
extern struct symtab *find_pc_sect_symtab (CORE_ADDR, struct obj_section *);
extern int find_pc_line_pc_range (CORE_ADDR, CORE_ADDR *, CORE_ADDR *);
extern void reread_symbols (void);
extern struct type *lookup_transparent_type (const char *);
extern struct type *basic_lookup_transparent_type (const char *);
/* Macro for name of symbol to indicate a file compiled with gcc. */
#ifndef GCC_COMPILED_FLAG_SYMBOL
#define GCC_COMPILED_FLAG_SYMBOL "gcc_compiled."
#endif
/* Macro for name of symbol to indicate a file compiled with gcc2. */
#ifndef GCC2_COMPILED_FLAG_SYMBOL
#define GCC2_COMPILED_FLAG_SYMBOL "gcc2_compiled."
#endif
extern int in_gnu_ifunc_stub (CORE_ADDR pc);
/* Functions for resolving STT_GNU_IFUNC symbols which are implemented only
for ELF symbol files. */
struct gnu_ifunc_fns
{
/* See elf_gnu_ifunc_resolve_addr for its real implementation. */
CORE_ADDR (*gnu_ifunc_resolve_addr) (struct gdbarch *gdbarch, CORE_ADDR pc);
/* See elf_gnu_ifunc_resolve_name for its real implementation. */
int (*gnu_ifunc_resolve_name) (const char *function_name,
CORE_ADDR *function_address_p);
/* See elf_gnu_ifunc_resolver_stop for its real implementation. */
void (*gnu_ifunc_resolver_stop) (struct breakpoint *b);
/* See elf_gnu_ifunc_resolver_return_stop for its real implementation. */
void (*gnu_ifunc_resolver_return_stop) (struct breakpoint *b);
};
#define gnu_ifunc_resolve_addr gnu_ifunc_fns_p->gnu_ifunc_resolve_addr
#define gnu_ifunc_resolve_name gnu_ifunc_fns_p->gnu_ifunc_resolve_name
#define gnu_ifunc_resolver_stop gnu_ifunc_fns_p->gnu_ifunc_resolver_stop
#define gnu_ifunc_resolver_return_stop \
gnu_ifunc_fns_p->gnu_ifunc_resolver_return_stop
extern const struct gnu_ifunc_fns *gnu_ifunc_fns_p;
extern CORE_ADDR find_solib_trampoline_target (struct frame_info *, CORE_ADDR);
struct symtab_and_line
{
/* The program space of this sal. */
struct program_space *pspace;
struct symtab *symtab;
struct obj_section *section;
/* Line number. Line numbers start at 1 and proceed through symtab->nlines.
0 is never a valid line number; it is used to indicate that line number
information is not available. */
int line;
CORE_ADDR pc;
CORE_ADDR end;
int explicit_pc;
int explicit_line;
/* The probe associated with this symtab_and_line. */
struct probe *probe;
};
extern void init_sal (struct symtab_and_line *sal);
struct symtabs_and_lines
{
struct symtab_and_line *sals;
int nelts;
};
/* Some types and macros needed for exception catchpoints.
Can't put these in target.h because symtab_and_line isn't
known there. This file will be included by breakpoint.c,
hppa-tdep.c, etc. */
/* Enums for exception-handling support. */
enum exception_event_kind
{
EX_EVENT_THROW,
EX_EVENT_CATCH
};
/* Given a pc value, return line number it is in. Second arg nonzero means
if pc is on the boundary use the previous statement's line number. */
extern struct symtab_and_line find_pc_line (CORE_ADDR, int);
/* Same function, but specify a section as well as an address. */
extern struct symtab_and_line find_pc_sect_line (CORE_ADDR,
struct obj_section *, int);
/* Given a symtab and line number, return the pc there. */
extern int find_line_pc (struct symtab *, int, CORE_ADDR *);
extern int find_line_pc_range (struct symtab_and_line, CORE_ADDR *,
CORE_ADDR *);
extern void resolve_sal_pc (struct symtab_and_line *);
/* Given a string, return the line specified by it. For commands like "list"
and "breakpoint". */
extern struct symtabs_and_lines decode_line_spec (char *, int);
extern struct symtabs_and_lines decode_line_spec_1 (char *, int);
/* Symmisc.c */
void maintenance_print_symbols (char *, int);
void maintenance_print_psymbols (char *, int);
void maintenance_print_msymbols (char *, int);
void maintenance_print_objfiles (char *, int);
void maintenance_info_symtabs (char *, int);
void maintenance_info_psymtabs (char *, int);
void maintenance_check_symtabs (char *, int);
/* maint.c */
void maintenance_print_statistics (char *, int);
/* Symbol-reading stuff in symfile.c and solib.c. */
extern void clear_solib (void);
/* source.c */
extern int identify_source_line (struct symtab *, int, int, CORE_ADDR);
extern void print_source_lines (struct symtab *, int, int, int);
extern void forget_cached_source_info_for_objfile (struct objfile *);
extern void forget_cached_source_info (void);
extern void select_source_symtab (struct symtab *);
extern VEC (char_ptr) *default_make_symbol_completion_list_break_on
(char *text, char *word, const char *break_on);
extern VEC (char_ptr) *default_make_symbol_completion_list (char *, char *);
extern VEC (char_ptr) *make_symbol_completion_list (char *, char *);
extern VEC (char_ptr) *make_symbol_completion_list_fn (struct cmd_list_element *,
char *, char *);
extern VEC (char_ptr) *make_file_symbol_completion_list (char *,
char *, char *);
extern VEC (char_ptr) *make_source_files_completion_list (char *, char *);
/* symtab.c */
int matching_obj_sections (struct obj_section *, struct obj_section *);
extern const char *find_main_filename (void);
extern struct symtab *find_line_symtab (struct symtab *, int, int *, int *);
extern struct symtab_and_line find_function_start_sal (struct symbol *sym,
int);
extern void skip_prologue_sal (struct symtab_and_line *);
/* symfile.c */
extern void clear_symtab_users (int add_flags);
extern enum language deduce_language_from_filename (const char *);
/* symtab.c */
extern int in_prologue (struct gdbarch *gdbarch,
CORE_ADDR pc, CORE_ADDR func_start);
extern CORE_ADDR skip_prologue_using_sal (struct gdbarch *gdbarch,
CORE_ADDR func_addr);
extern struct symbol *fixup_symbol_section (struct symbol *,
struct objfile *);
/* Symbol searching */
/* When using search_symbols, a list of the following structs is returned.
Callers must free the search list using free_search_symbols! */
struct symbol_search
{
/* The block in which the match was found. Could be, for example,
STATIC_BLOCK or GLOBAL_BLOCK. */
int block;
/* Information describing what was found.
If symtab abd symbol are NOT NULL, then information was found
for this match. */
struct symtab *symtab;
struct symbol *symbol;
/* If msymbol is non-null, then a match was made on something for
which only minimal_symbols exist. */
struct minimal_symbol *msymbol;
/* A link to the next match, or NULL for the end. */
struct symbol_search *next;
};
extern void search_symbols (char *, enum search_domain, int, char **,
struct symbol_search **);
extern void free_search_symbols (struct symbol_search *);
extern struct cleanup *make_cleanup_free_search_symbols (struct symbol_search
*);
/* The name of the ``main'' function.
FIXME: cagney/2001-03-20: Can't make main_name() const since some
of the calling code currently assumes that the string isn't
const. */
extern void set_main_name (const char *name);
extern /*const */ char *main_name (void);
extern enum language language_of_main;
/* Check global symbols in objfile. */
struct symbol *lookup_global_symbol_from_objfile (const struct objfile *,
const char *name,
const domain_enum domain);
/* Return 1 if the supplied producer string matches the ARM RealView
compiler (armcc). */
int producer_is_realview (const char *producer);
void fixup_section (struct general_symbol_info *ginfo,
CORE_ADDR addr, struct objfile *objfile);
struct objfile *lookup_objfile_from_block (const struct block *block);
extern int basenames_may_differ;
int compare_filenames_for_search (const char *filename,
const char *search_name,
int search_len);
int iterate_over_some_symtabs (const char *name,
const char *full_path,
const char *real_path,
int (*callback) (struct symtab *symtab,
void *data),
void *data,
struct symtab *first,
struct symtab *after_last);
void iterate_over_symtabs (const char *name,
int (*callback) (struct symtab *symtab,
void *data),
void *data);
DEF_VEC_I (CORE_ADDR);
VEC (CORE_ADDR) *find_pcs_for_symtab_line (struct symtab *symtab, int line,
struct linetable_entry **best_entry);
/* Callback for LA_ITERATE_OVER_SYMBOLS. The callback will be called
once per matching symbol SYM, with DATA being the argument of the
same name that was passed to LA_ITERATE_OVER_SYMBOLS. The callback
should return nonzero to indicate that LA_ITERATE_OVER_SYMBOLS
should continue iterating, or zero to indicate that the iteration
should end. */
typedef int (symbol_found_callback_ftype) (struct symbol *sym, void *data);
void iterate_over_symbols (const struct block *block, const char *name,
const domain_enum domain,
symbol_found_callback_ftype *callback,
void *data);
struct cleanup *demangle_for_lookup (const char *name, enum language lang,
const char **result_name);
#endif /* !defined(SYMTAB_H) */
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