/* Definitions for frame unwinder, for GDB, the GNU debugger.
- Copyright (C) 2003, 2004, 2007, 2008, 2009 Free Software Foundation, Inc.
+ Copyright (C) 2003-2004, 2007-2012 Free Software Foundation, Inc.
This file is part of GDB.
#include "inline-frame.h"
#include "value.h"
#include "regcache.h"
-
+#include "exceptions.h"
#include "gdb_assert.h"
#include "gdb_obstack.h"
{
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;
- table->list->next = OBSTACK_ZALLOC (obstack, struct frame_unwind_table_entry);
- table->list->next->unwinder = inline_frame_unwind;
+ table->list->unwinder = &dummy_frame_unwind;
+ table->list->next = OBSTACK_ZALLOC (obstack,
+ struct frame_unwind_table_entry);
+ table->list->next->unwinder = &inline_frame_unwind;
/* The insertion point for OSABI sniffers. */
table->osabi_head = &table->list->next->next;
return table;
(*ip)->unwinder = unwinder;
}
-const struct frame_unwind *
+/* Iterate through sniffers for THIS_FRAME frame until one returns with an
+ unwinder implementation. THIS_FRAME->UNWIND must be NULL, it will get set
+ by this function. Possibly initialize THIS_CACHE. */
+
+void
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;
+ volatile struct gdb_exception ex;
+ int res = 0;
old_cleanup = frame_prepare_for_sniffer (this_frame, entry->unwinder);
- if (entry->unwinder->sniffer (entry->unwinder, this_frame,
- this_cache))
+
+ TRY_CATCH (ex, RETURN_MASK_ERROR)
{
- discard_cleanups (old_cleanup);
- return entry->unwinder;
+ res = entry->unwinder->sniffer (entry->unwinder, this_frame,
+ this_cache);
}
+ if (ex.reason < 0 && ex.error == NOT_AVAILABLE_ERROR)
+ {
+ /* This usually means that not even the PC is available,
+ thus most unwinders aren't able to determine if they're
+ the best fit. Keep trying. Fallback prologue unwinders
+ should always accept the frame. */
+ }
+ else if (ex.reason < 0)
+ throw_exception (ex);
+ else if (res)
+ {
+ discard_cleanups (old_cleanup);
+ return;
+ }
+
do_cleanups (old_cleanup);
}
internal_error (__FILE__, __LINE__, _("frame_unwind_find_by_frame failed"));
return 1;
}
+/* A default frame unwinder stop_reason callback that always claims
+ the frame is unwindable. */
+
+enum unwind_stop_reason
+default_frame_unwind_stop_reason (struct frame_info *this_frame,
+ void **this_cache)
+{
+ return UNWIND_NO_REASON;
+}
+
/* Helper functions for value-based register unwinding. These return
a (possibly lazy) value of the appropriate type. */
struct value *
frame_unwind_got_optimized (struct frame_info *frame, int regnum)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch *gdbarch = frame_unwind_arch (frame);
struct value *reg_val;
reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
register NEW_REGNUM. */
struct value *
-frame_unwind_got_register (struct frame_info *frame, int regnum, int new_regnum)
+frame_unwind_got_register (struct frame_info *frame,
+ int regnum, int new_regnum)
{
return value_of_register_lazy (frame, new_regnum);
}
struct value *
frame_unwind_got_memory (struct frame_info *frame, int regnum, CORE_ADDR addr)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch *gdbarch = frame_unwind_arch (frame);
+ struct value *v = value_at_lazy (register_type (gdbarch, regnum), addr);
- return value_at_lazy (register_type (gdbarch, regnum), addr);
+ set_value_stack (v, 1);
+ return v;
}
/* Return a value which indicates that FRAME's saved version of
frame_unwind_got_constant (struct frame_info *frame, int regnum,
ULONGEST val)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch *gdbarch = frame_unwind_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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);
+ register_size (gdbarch, regnum), byte_order, 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 gdbarch *gdbarch = frame_unwind_arch (frame);
struct value *reg_val;
reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
frame_unwind_got_address (struct frame_info *frame, int regnum,
CORE_ADDR addr)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch *gdbarch = frame_unwind_arch (frame);
struct value *reg_val;
reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
return reg_val;
}
-extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */
+/* -Wmissing-prototypes */
+extern initialize_file_ftype _initialize_frame_unwind;
void
_initialize_frame_unwind (void)