Convert frame unwinders to use the current frame and

	"struct value".

	* frame.c (frame_debug): Make global.
	(get_frame_id): Pass this frame to unwinder routines.
	(frame_pc_unwind): Remove unused unwind->prev_pc support.
	(do_frame_register_read): Do not discard the return value of
	frame_register_read.
	(frame_register_unwind): Remove debug messages.  Use
	frame_unwind_register_value.
	(frame_unwind_register_value, get_frame_register_value): New
	functions.
	(create_new_frame, get_frame_base_address, get_frame_locals_address)
	(get_frame_args_address, get_frame_type): Pass this frame to
	unwinder routines.
	(frame_cleanup_after_sniffer, frame_prepare_for_sniffer): New
	functions.
	* frame.h: Update comments.
	(frame_debug, frame_unwind_register_value, get_frame_register_value)
	(frame_prepare_for_sniffer): Declare.
	* frame-unwind.h: Update comments and parameter names.
	(default_frame_sniffer): Declare.
	(frame_prev_register_ftype): Return a struct value *.
	(struct frame_unwind): Remove prev_pc member.
	(frame_unwind_sniffer_ftype, frame_unwind_append_sniffer): Delete.
	(frame_unwind_append_unwinder, frame_unwind_got_optimized)
	(frame_unwind_got_register, frame_unwind_got_memory)
	(frame_unwind_got_constant, frame_unwind_got_address): Declare.
	* frame-base.h: Update comments and parameter names.
	* valops.c (value_fetch_lazy): Use get_frame_register_value.  Iterate
	if necessary.  Add debugging output.
	* sentinel-frame.c (sentinel_frame_prev_register)
	(sentinel_frame_this_id): Update for new signature.
	(sentinel_frame_prev_pc): Delete.
	(sentinel_frame_unwinder): Remove prev_pc.
	* ia64-tdep.c (ia64_libunwind_frame_unwind): Do not initialize
	prev_pc.
	* libunwind-frame.c (libunwind_frame_unwind): Likewise.
	* frame-unwind.c (struct frame_unwind_table_entry): Remove sniffer.
	(frame_unwind_append_sniffer): Delete.
	(frame_unwind_append_unwinder): New function.
	(frame_unwind_find_by_frame): Take this frame.  Only use sniffers
	from unwinders.  Use frame_prepare_for_sniffer.
	(default_frame_sniffer, frame_unwind_got_optimized)
	(frame_unwind_got_register, frame_unwind_got_memory)
	(frame_unwind_got_constant, frame_unwind_got_address): New functions.
	* dummy-frame.c (dummy_frame_sniffer): Use gdbarch_dummy_id.
	(dummy_frame_prev_register, dummy_frame_this_id): Update for new
	signature.
	* gdbarch.sh: Replace unwind_dummy_id with dummy_id.
	* gdbarch.c, gdbarch.c: Regenerated.
	* frame-base.c (default_frame_base_address)
	(default_frame_locals_address, default_frame_args_address): Update
	for new signature.
	(frame_base_find_by_frame): Pass this frame to unwinder routines.
	* infcall.c (call_function_by_hand): Update comments.
	* Makefile.in (frame-unwind.o): Update dependencies.

	* gdbint.texinfo (Stack Frames): New chapter.
	(Algorithms): Move Frames text to the new chapter.
	(Target Conditionals): Delete SAVE_DUMMY_FRAME_TOS.  Document
	gdbarch_dummy_id instead of gdbarch_unwind_dummy_id.

1 files changed, 8 insertions, 9 deletions

diff --git a/gdb/frame-base.c b/gdb/frame-base.c
index b85d2de..e7b6cdd 100644
--- a/gdb/frame-base.c
+++ b/gdb/frame-base.c
@@ -28,22 +28,21 @@
    really need to override this.  */
 
 static CORE_ADDR
-default_frame_base_address (struct frame_info *next_frame, void **this_cache)
+default_frame_base_address (struct frame_info *this_frame, void **this_cache)
 {
-  struct frame_info *this_frame = get_prev_frame (next_frame);
   return get_frame_base (this_frame); /* sigh! */
 }
 
 static CORE_ADDR
-default_frame_locals_address (struct frame_info *next_frame, void **this_cache)
+default_frame_locals_address (struct frame_info *this_frame, void **this_cache)
 {
-  return default_frame_base_address (next_frame, this_cache);
+  return default_frame_base_address (this_frame, this_cache);
 }
 
 static CORE_ADDR
-default_frame_args_address (struct frame_info *next_frame, void **this_cache)
+default_frame_args_address (struct frame_info *this_frame, void **this_cache)
 {
-  return default_frame_base_address (next_frame, this_cache);
+  return default_frame_base_address (this_frame, this_cache);
 }
 
 const struct frame_base default_frame_base = {
@@ -97,16 +96,16 @@ frame_base_set_default (struct gdbarch *gdbarch,
 }
 
 const struct frame_base *
-frame_base_find_by_frame (struct frame_info *next_frame)
+frame_base_find_by_frame (struct frame_info *this_frame)
 {
-  struct gdbarch *gdbarch = get_frame_arch (next_frame);
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
   struct frame_base_table *table = gdbarch_data (gdbarch, frame_base_data);
   struct frame_base_table_entry *entry;
 
   for (entry = table->head; entry != NULL; entry = entry->next)
     {
       const struct frame_base *desc = NULL;
-      desc = entry->sniffer (next_frame);
+      desc = entry->sniffer (this_frame);
       if (desc != NULL)
 	return desc;
     }