2011-06-01  David Li  <davidxl@google.com>

	* tree-dump.c: New dump flags.
	* tree-pass.h: New dump flags.
	* passes.c (execute_one_pass): Handle dump_before flag.

Index: tree-dump.c
===================================================================
--- tree-dump.c	(revision 174446)
+++ tree-dump.c	(working copy)
@@ -808,6 +808,7 @@ struct dump_option_value_info
    in tree.h */
 static const struct dump_option_value_info dump_options[] =
 {
+  {"before",  TDF_BEFORE},
   {"address", TDF_ADDRESS},
   {"asmname", TDF_ASMNAME},
   {"slim", TDF_SLIM},
Index: tree-pass.h
===================================================================
--- tree-pass.h	(revision 174446)
+++ tree-pass.h	(working copy)
@@ -83,6 +83,7 @@ enum tree_dump_index
 #define TDF_ALIAS	(1 << 21)	/* display alias information  */
 #define TDF_ENUMERATE_LOCALS (1 << 22)	/* Enumerate locals by uid.  */
 #define TDF_CSELIB	(1 << 23)	/* Dump cselib details.  */
+#define TDF_BEFORE	(1 << 24)	/* Dump IR before pass.  */
 
 
 /* In tree-dump.c */
Index: passes.c
===================================================================
--- passes.c	(revision 174446)
+++ passes.c	(working copy)
@@ -1563,6 +1563,13 @@ execute_one_pass (struct opt_pass *pass)
 
   initializing_dump = pass_init_dump_file (pass);
 
+  /* Override dump TODOs.  */
+  if (dump_file && (pass->todo_flags_finish & TODO_dump_func)
+      && (dump_flags & TDF_BEFORE))
+    {
+      pass->todo_flags_finish &= ~TODO_dump_func;
+      pass->todo_flags_start |= TODO_dump_func;
+    }
   /* Run pre-pass verification.  */
   execute_todo (pass->todo_flags_start);