From 8a502a808ec70c87e7a0a4bc7719115859a9dd7a Mon Sep 17 00:00:00 2001
From: Jeff Law <law@redhat.com>
Date: Tue, 19 Sep 2017 23:23:51 -0600
Subject: [PATCH] function.c (dump_stack_clash_frame_info): New function.

        * function.c (dump_stack_clash_frame_info): New function.
        * function.h (dump_stack_clash_frame_info): Prototype.
        (enum stack_clash_probes): New enum.

From-SVN: r252997
---
 gcc/ChangeLog  |  4 ++++
 gcc/function.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
 gcc/function.h |  8 ++++++++
 3 files changed, 64 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 070692c5053..97833130937 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2017-09-19  Jeff Law  <law@redhat.com>
 
+        * function.c (dump_stack_clash_frame_info): New function.
+        * function.h (dump_stack_clash_frame_info): Prototype.
+        (enum stack_clash_probes): New enum.
+
 	* config/alpha/alpha.c (alpha_expand_prologue): Also check
 	flag_stack_clash_protection.
 	* config/arm/arm.c (arm_compute_static_chain_stack_bytes): Likewise.
diff --git a/gcc/function.c b/gcc/function.c
index 3ae5a3afc0b..c03e2ac5142 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -5681,6 +5681,58 @@ get_arg_pointer_save_area (void)
   return ret;
 }
 
+
+/* If debugging dumps are requested, dump information about how the
+   target handled -fstack-check=clash for the prologue.
+
+   PROBES describes what if any probes were emitted.
+
+   RESIDUALS indicates if the prologue had any residual allocation
+   (i.e. total allocation was not a multiple of PROBE_INTERVAL).  */
+
+void
+dump_stack_clash_frame_info (enum stack_clash_probes probes, bool residuals)
+{
+  if (!dump_file)
+    return;
+
+  switch (probes)
+    {
+    case NO_PROBE_NO_FRAME:
+      fprintf (dump_file,
+	       "Stack clash no probe no stack adjustment in prologue.\n");
+      break;
+    case NO_PROBE_SMALL_FRAME:
+      fprintf (dump_file,
+	       "Stack clash no probe small stack adjustment in prologue.\n");
+      break;
+    case PROBE_INLINE:
+      fprintf (dump_file, "Stack clash inline probes in prologue.\n");
+      break;
+    case PROBE_LOOP:
+      fprintf (dump_file, "Stack clash probe loop in prologue.\n");
+      break;
+    }
+
+  if (residuals)
+    fprintf (dump_file, "Stack clash residual allocation in prologue.\n");
+  else
+    fprintf (dump_file, "Stack clash no residual allocation in prologue.\n");
+
+  if (frame_pointer_needed)
+    fprintf (dump_file, "Stack clash frame pointer needed.\n");
+  else
+    fprintf (dump_file, "Stack clash no frame pointer needed.\n");
+
+  if (TREE_THIS_VOLATILE (cfun->decl))
+    fprintf (dump_file,
+	     "Stack clash noreturn prologue, assuming no implicit"
+	     " probes in caller.\n");
+  else
+    fprintf (dump_file,
+	     "Stack clash not noreturn prologue.\n");
+}
+
 /* Add a list of INSNS to the hash HASHP, possibly allocating HASHP
    for the first time.  */
 
diff --git a/gcc/function.h b/gcc/function.h
index 91e01383252..76434cd59a5 100644
--- a/gcc/function.h
+++ b/gcc/function.h
@@ -551,6 +551,14 @@ do {								\
   ((TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn)	     \
    ? MAX (FUNCTION_BOUNDARY, 2 * BITS_PER_UNIT) : FUNCTION_BOUNDARY)
 
+enum stack_clash_probes {
+  NO_PROBE_NO_FRAME,
+  NO_PROBE_SMALL_FRAME,
+  PROBE_INLINE,
+  PROBE_LOOP
+};
+
+extern void dump_stack_clash_frame_info (enum stack_clash_probes, bool);
 
 
 extern void push_function_context (void);
-- 
2.30.2