/* Code dealing with dummy stack frames, for GDB, the GNU debugger.
Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
- 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008
+ 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GDB.
/* This frame's ID. Must match the value returned by
gdbarch_dummy_id. */
struct frame_id id;
- /* The caller's regcache. */
- struct regcache *regcache;
+ /* The caller's state prior to the call. */
+ struct inferior_thread_state *caller_state;
};
static struct dummy_frame *dummy_frame_stack = NULL;
return 0;
}
-/* Push the caller's state, along with the dummy frame info, onto a
+/* Push the caller's state, along with the dummy frame info, onto the
dummy-frame stack. */
void
-dummy_frame_push (struct regcache *caller_regcache,
+dummy_frame_push (struct inferior_thread_state *caller_state,
const struct frame_id *dummy_id)
{
struct dummy_frame *dummy_frame;
dummy_frame = XZALLOC (struct dummy_frame);
- dummy_frame->regcache = caller_regcache;
+ dummy_frame->caller_state = caller_state;
dummy_frame->id = (*dummy_id);
dummy_frame->next = dummy_frame_stack;
dummy_frame_stack = dummy_frame;
}
-/* Pop the dummy frame with ID dummy_id from the dummy-frame stack. */
+/* Remove *DUMMY_PTR from the dummy frame stack. */
-void
-dummy_frame_pop (struct frame_id dummy_id)
+static void
+remove_dummy_frame (struct dummy_frame **dummy_ptr)
{
- struct dummy_frame **dummy_ptr;
+ struct dummy_frame *dummy = *dummy_ptr;
- for (dummy_ptr = &dummy_frame_stack;
- (*dummy_ptr) != NULL;
- dummy_ptr = &(*dummy_ptr)->next)
- {
- struct dummy_frame *dummy = *dummy_ptr;
- if (frame_id_eq (dummy->id, dummy_id))
- {
- *dummy_ptr = dummy->next;
- regcache_xfree (dummy->regcache);
- xfree (dummy);
- break;
- }
- }
+ *dummy_ptr = dummy->next;
+ discard_inferior_thread_state (dummy->caller_state);
+ xfree (dummy);
}
-/* There may be stale dummy frames, perhaps left over from when a longjump took us
- out of a function that was called by the debugger. Clean them up at least once
- whenever we start a new inferior. */
+/* Pop *DUMMY_PTR, restoring program state to that before the
+ frame was created. */
static void
-cleanup_dummy_frames (struct target_ops *target, int from_tty)
+pop_dummy_frame (struct dummy_frame **dummy_ptr)
{
- struct dummy_frame *dummy, *next;
+ struct dummy_frame *dummy;
- for (dummy = dummy_frame_stack; dummy; dummy = next)
+ restore_inferior_thread_state ((*dummy_ptr)->caller_state);
+
+ /* restore_inferior_status frees inf_state,
+ all that remains is to pop *dummy_ptr */
+ dummy = *dummy_ptr;
+ *dummy_ptr = dummy->next;
+ xfree (dummy);
+
+ /* We've made right mess of GDB's local state, just discard
+ everything. */
+ reinit_frame_cache ();
+}
+
+/* Look up DUMMY_ID.
+ Return NULL if not found. */
+
+static struct dummy_frame **
+lookup_dummy_frame (struct frame_id dummy_id)
+{
+ struct dummy_frame **dp;
+
+ for (dp = &dummy_frame_stack; *dp != NULL; dp = &(*dp)->next)
{
- next = dummy->next;
- regcache_xfree (dummy->regcache);
- xfree (dummy);
+ if (frame_id_eq ((*dp)->id, dummy_id))
+ return dp;
}
- dummy_frame_stack = NULL;
+ return NULL;
+}
+
+/* Pop the dummy frame DUMMY_ID, restoring program state to that before the
+ frame was created.
+ On return reinit_frame_cache has been called.
+ If the frame isn't found, flag an internal error.
+
+ NOTE: This can only pop the one frame, even if it is in the middle of the
+ stack, because the other frames may be for different threads, and there's
+ currently no way to tell which stack frame is for which thread. */
+
+void
+dummy_frame_pop (struct frame_id dummy_id)
+{
+ struct dummy_frame **dp;
+
+ dp = lookup_dummy_frame (dummy_id);
+ gdb_assert (dp != NULL);
+
+ pop_dummy_frame (dp);
+}
+
+/* There may be stale dummy frames, perhaps left over from when a longjump took
+ us out of a function that was called by the debugger. Clean them up at
+ least once whenever we start a new inferior. */
+
+static void
+cleanup_dummy_frames (struct target_ops *target, int from_tty)
+{
+ while (dummy_frame_stack != NULL)
+ remove_dummy_frame (&dummy_frame_stack);
}
/* Return the dummy frame cache, it contains both the ID, and a
struct regcache *prev_regcache;
};
-int
+static int
dummy_frame_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame,
void **this_prologue_cache)
that PC to apply standard frame ID unwind techniques is just
asking for trouble. */
- /* Don't bother unles there is at least one dummy frame. */
+ /* Don't bother unless there is at least one dummy frame. */
if (dummy_frame_stack != NULL)
{
/* Use an architecture specific method to extract this frame's
{
struct dummy_frame_cache *cache;
cache = FRAME_OBSTACK_ZALLOC (struct dummy_frame_cache);
- cache->prev_regcache = dummyframe->regcache;
+ cache->prev_regcache = get_inferior_thread_state_regcache (dummyframe->caller_state);
cache->this_id = this_id;
(*this_prologue_cache) = cache;
return 1;
return reg_val;
}
-/* Assuming that THIS frame is a dummy, return the ID of THIS frame. That ID is
+/* Assuming that THIS_FRAME is a dummy, return its ID. That ID is
determined by examining the NEXT frame's unwound registers using
the method dummy_id(). As a side effect, THIS dummy frame's
dummy cache is located and and saved in THIS_PROLOGUE_CACHE. */
projects / deliverable / binutils-gdb.git / blobdiff