[Darwin, PPC, committed] Improve mdebug=stack for Darwin.

[Darwin, PPC, committed] Improve mdebug=stack for Darwin.

[Iain Sandoe]

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It seems to be quite frequently the case that we need to look at the pro/epilogue behaviour.
This adds the state of the “save_world” computation to the debug output that’s printed in
response to -mdebug=stack on powerpc-darwin.

tested on powerpc-darwin9, applied to trunk.

thanks
Iain

gcc/

2019-05-12  Iain Sandoe  <iain@sandoe.co.uk>

	* config/rs6000/rs6000.c (debug_stack_info): When -mdebug=stack
	is given, print the state of the EH "save world" computation for
	Darwin.


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Index: gcc/ChangeLog
===================================================================
--- gcc/ChangeLog	(revision 271100)
+++ gcc/ChangeLog	(working copy)
@@ -1,3 +1,9 @@
+2019-05-12  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* config/rs6000/rs6000.c (debug_stack_info): When -mdebug=stack
+	is given, print the state of the EH "save world" computation for
+	Darwin.
+
 2019-05-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/59813
Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c	(revision 271100)
+++ gcc/config/rs6000/rs6000.c	(working copy)
@@ -24721,6 +24721,9 @@ debug_stack_info (rs6000_stack_t *info)
 
     fprintf (stderr, "\tsave-strategy       =  %04x\n", info->savres_strategy);
 
+  if (info->abi == ABI_DARWIN)
+    fprintf (stderr, "\tWORLD_SAVE_P        = %5d\n", WORLD_SAVE_P(info));
+
   fprintf (stderr, "\n");
 }