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binutils-gdb
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record-btrace, frame: supply target-specific unwinder 

Supply a target-specific frame unwinder for the record-btrace target that does
not allow unwinding while replaying.

2013-02-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
            Markus Metzger  <markus.t.metzger@intel.com>

gdb/
	* record-btrace.c: Include frame-unwind.h.
	(record_btrace_frame_unwind_stop_reason)
	(record_btrace_frame_this_id, record_btrace_frame_prev_register)
	(record_btrace_frame_sniffer, record_btrace_frame_unwind):
	New.
	(init_record_btrace_ops): Install it.
This commit is contained in:
Markus Metzger 2013-03-18 16:47:01 +01:00
parent 824344ca4f
commit cecac1aba0
2 changed files with 74 additions and 0 deletions
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10
gdb/ChangeLog
View File

@ -1,3 +1,13 @@
2014-01-16 Jan Kratochvil <jan.kratochvil@redhat.com>
Markus Metzger <markus.t.metzger@intel.com>
* record-btrace.c: Include frame-unwind.h.
(record_btrace_frame_unwind_stop_reason)
(record_btrace_frame_this_id, record_btrace_frame_prev_register)
(record_btrace_frame_sniffer, record_btrace_frame_unwind):
New.
(init_record_btrace_ops): Install it.
2014-01-16 Jan Kratochvil <jan.kratochvil@redhat.com>
* frame.c (get_frame_unwind_stop_reason): Unconditionally call

64
gdb/record-btrace.c
View File

@ -33,6 +33,7 @@
#include "symtab.h"
#include "filenames.h"
#include "regcache.h"
#include "frame-unwind.h"
/* The target_ops of record-btrace. */
static struct target_ops record_btrace_ops;
@ -839,6 +840,68 @@ record_btrace_prepare_to_store (struct target_ops *ops,
}
}
/* Implement stop_reason method for record_btrace_frame_unwind. */
static enum unwind_stop_reason
record_btrace_frame_unwind_stop_reason (struct frame_info *this_frame,
void **this_cache)
{
return UNWIND_UNAVAILABLE;
}
/* Implement this_id method for record_btrace_frame_unwind. */
static void
record_btrace_frame_this_id (struct frame_info *this_frame, void **this_cache,
struct frame_id *this_id)
{
/* Leave there the outer_frame_id value. */
}
/* Implement prev_register method for record_btrace_frame_unwind. */
static struct value *
record_btrace_frame_prev_register (struct frame_info *this_frame,
void **this_cache,
int regnum)
{
throw_error (NOT_AVAILABLE_ERROR,
_("Registers are not available in btrace record history"));
}
/* Implement sniffer method for record_btrace_frame_unwind. */
static int
record_btrace_frame_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame,
void **this_cache)
{
struct thread_info *tp;
struct btrace_thread_info *btinfo;
struct btrace_insn_iterator *replay;
/* THIS_FRAME does not contain a reference to its thread. */
tp = find_thread_ptid (inferior_ptid);
gdb_assert (tp != NULL);
return btrace_is_replaying (tp);
}
/* btrace recording does not store previous memory content, neither the stack
frames content. Any unwinding would return errorneous results as the stack
contents no longer matches the changed PC value restored from history.
Therefore this unwinder reports any possibly unwound registers as
<unavailable>. */
static const struct frame_unwind record_btrace_frame_unwind =
{
NORMAL_FRAME,
record_btrace_frame_unwind_stop_reason,
record_btrace_frame_this_id,
record_btrace_frame_prev_register,
NULL,
record_btrace_frame_sniffer
};
/* Initialize the record-btrace target ops. */
static void
@ -869,6 +932,7 @@ init_record_btrace_ops (void)
ops->to_fetch_registers = record_btrace_fetch_registers;
ops->to_store_registers = record_btrace_store_registers;
ops->to_prepare_to_store = record_btrace_prepare_to_store;
ops->to_get_unwinder = &record_btrace_frame_unwind;
ops->to_stratum = record_stratum;
ops->to_magic = OPS_MAGIC;
}