(reload): If checking stack, verify frame small enough.

From-SVN: r14471

diff --git a/gcc/reload1.c b/gcc/reload1.c
index ca61d9731f403b440a17baab4120c2360cd48e65..8ad19a6d8fa9e0237d72ed0c177675e709a58cc8 100644 (file)
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -2162,6 +2162,20 @@ reload (first, global, dumpfile)
       }
 #endif
 
+  /* If we are doing stack checking, give a warning if this function's
+     frame size is larger than we expect.  */
+  if (flag_stack_check && ! STACK_CHECK_BUILTIN)
+    {
+      HOST_WIDE_INT size = get_frame_size () + STACK_CHECK_FIXED_FRAME_SIZE;
+
+      for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
+       if (regs_ever_live[i] && ! fixed_regs[i] && call_used_regs[i])
+         size += UNITS_PER_WORD;
+
+      if (size > STACK_CHECK_MAX_FRAME_SIZE)
+       warning ("frame size too large for reliable stack checking");
+    }
+       
   /* Indicate that we no longer have known memory locations or constants.  */
   reg_equiv_constant = 0;
   reg_equiv_memory_loc = 0;