* target.h (struct gcc_target): New field 'dwarf_handle_frame_unspec'.

	* target_def.h (TARGET_DWARF_HANDLE_FRAME_UNSPEC): Define to 0.
	(TARGET_INITIALIZER): Add TARGET_DWARF_HANDLE_FRAME_UNSPEC.
	* dwarf2out.c (dwarf2out_frame_debug_expr): Allow REG->REG move
	to a fixed reg if the source is the Return Address register.
	Implement new Rule 15.
	* doc/tm.texi (Frame Layout): Document TARGET_DWARF_HANDLE_FRAME_UNSPEC.
	* config/sparc/sparc.c (TARGET_DWARF_HANDLE_FRAME_UNSPEC): Define to
	sparc_dwarf_handle_frame_unspec.
	(gen_save_register_window): New function.
	(emit_stack_pointer_increment): Rename into gen_stack_pointer_inc.
	(emit_stack_pointer_decrement): Rename into gen_stack_pointer_dec.
	(expand_prologue): Adjust calls to emit_stack_pointer_{in,de}crement.
	Set RTX_FRAME_RELATED_P on the appropriate insns and members of insns.
	(sparc_asm_function_prologue): Do not emit call frame debugging info.
	(emit_and_preserve): Adjust calls to emit_stack_pointer_{in,de}crement.
	(sparc_expand_epilogue): Likewise.
	(sparc_dwarf_handle_frame_unspec): New function.
	* config/sparc/sparc.md (save_register_window): Remove.
	(save_register_windowdi): Rewrite modelled on the callframe debug info.
	(save_register_windowsi): Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@91346 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 9 insertions, 0 deletions

diff --git a/gcc/target.h b/gcc/target.h
index 0c2b1b467f0..4927d2bab4b 100644
--- a/gcc/target.h
+++ b/gcc/target.h
@@ -495,6 +495,15 @@ struct gcc_target
      the function is being declared as an int.  */
   int (* dwarf_calling_convention) (tree);
 
+  /* This target hook allows the backend to emit frame-related insns that
+     contain UNSPECs or UNSPEC_VOLATILEs.  The call frame debugging info
+     engine will invoke it on insns of the form
+       (set (reg) (unspec [...] UNSPEC_INDEX))
+     and
+       (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
+     to let the backend emit the call frame instructions.  */
+  void (* dwarf_handle_frame_unspec) (const char *, rtx, int);
+
   /* Functions relating to calls - argument passing, returns, etc.  */
   struct calls {
     bool (*promote_function_args) (tree fntype);