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/* Definitions for frame unwinder, for GDB, the GNU debugger.
Copyright (C) 2003, 2004, 2007, 2008 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/>. */
#include "defs.h"
#include "frame.h"
#include "frame-unwind.h"
#include "dummy-frame.h"
#include "value.h"
#include "regcache.h"
#include "gdb_assert.h"
#include "gdb_obstack.h"
static struct gdbarch_data *frame_unwind_data;
struct frame_unwind_table_entry
{
const struct frame_unwind *unwinder;
struct frame_unwind_table_entry *next;
};
struct frame_unwind_table
{
struct frame_unwind_table_entry *list;
/* The head of the OSABI part of the search list. */
struct frame_unwind_table_entry **osabi_head;
};
static void *
frame_unwind_init (struct obstack *obstack)
{
struct frame_unwind_table *table
= OBSTACK_ZALLOC (obstack, struct frame_unwind_table);
/* Start the table out with a few default sniffers. OSABI code
can't override this. */
table->list = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry);
table->list->unwinder = dummy_frame_unwind;
/* The insertion point for OSABI sniffers. */
table->osabi_head = &table->list->next;
return table;
}
void
frame_unwind_prepend_unwinder (struct gdbarch *gdbarch,
const struct frame_unwind *unwinder)
{
struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
struct frame_unwind_table_entry *entry;
/* Insert the new entry at the start of the list. */
entry = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry);
entry->unwinder = unwinder;
entry->next = (*table->osabi_head);
(*table->osabi_head) = entry;
}
void
frame_unwind_append_unwinder (struct gdbarch *gdbarch,
const struct frame_unwind *unwinder)
{
struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
struct frame_unwind_table_entry **ip;
/* Find the end of the list and insert the new entry there. */
for (ip = table->osabi_head; (*ip) != NULL; ip = &(*ip)->next);
(*ip) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind_table_entry);
(*ip)->unwinder = unwinder;
}
const struct frame_unwind *
frame_unwind_find_by_frame (struct frame_info *this_frame, void **this_cache)
{
int i;
struct gdbarch *gdbarch = get_frame_arch (this_frame);
struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
struct frame_unwind_table_entry *entry;
struct cleanup *old_cleanup;
for (entry = table->list; entry != NULL; entry = entry->next)
{
struct cleanup *old_cleanup;
old_cleanup = frame_prepare_for_sniffer (this_frame, entry->unwinder);
if (entry->unwinder->sniffer (entry->unwinder, this_frame,
this_cache))
{
discard_cleanups (old_cleanup);
return entry->unwinder;
}
do_cleanups (old_cleanup);
}
internal_error (__FILE__, __LINE__, _("frame_unwind_find_by_frame failed"));
}
/* A default frame sniffer which always accepts the frame. Used by
fallback prologue unwinders. */
int
default_frame_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame,
void **this_prologue_cache)
{
return 1;
}
/* Helper functions for value-based register unwinding. These return
a (possibly lazy) value of the appropriate type. */
/* Return a value which indicates that FRAME did not save REGNUM. */
struct value *
frame_unwind_got_optimized (struct frame_info *frame, int regnum)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
struct value *reg_val;
reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
set_value_optimized_out (reg_val, 1);
return reg_val;
}
/* Return a value which indicates that FRAME copied REGNUM into
register NEW_REGNUM. */
struct value *
frame_unwind_got_register (struct frame_info *frame, int regnum, int new_regnum)
{
return value_of_register_lazy (frame, new_regnum);
}
/* Return a value which indicates that FRAME saved REGNUM in memory at
ADDR. */
struct value *
frame_unwind_got_memory (struct frame_info *frame, int regnum, CORE_ADDR addr)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
return value_at_lazy (register_type (gdbarch, regnum), addr);
}
/* Return a value which indicates that FRAME's saved version of
REGNUM has a known constant (computed) value of VAL. */
struct value *
frame_unwind_got_constant (struct frame_info *frame, int regnum,
ULONGEST val)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
struct value *reg_val;
reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
store_unsigned_integer (value_contents_writeable (reg_val),
register_size (gdbarch, regnum), val);
return reg_val;
}
struct value *
frame_unwind_got_bytes (struct frame_info *frame, int regnum, gdb_byte *buf)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
struct value *reg_val;
reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
memcpy (value_contents_raw (reg_val), buf, register_size (gdbarch, regnum));
return reg_val;
}
/* Return a value which indicates that FRAME's saved version of REGNUM
has a known constant (computed) value of ADDR. Convert the
CORE_ADDR to a target address if necessary. */
struct value *
frame_unwind_got_address (struct frame_info *frame, int regnum,
CORE_ADDR addr)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
struct value *reg_val;
reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
pack_long (value_contents_writeable (reg_val),
register_type (gdbarch, regnum), addr);
return reg_val;
}
extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */
void
_initialize_frame_unwind (void)
{
frame_unwind_data = gdbarch_data_register_pre_init (frame_unwind_init);
}
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