File gcc34-rh172876.patch of Package gcc3

2006-03-01  Alexandre Oliva  <aoliva@redhat.com>

	* dwarf2out.c (dwarf2out_stack_adjust): Always track the stack
	pointer, instead of assuming it is possible to derive the
	correct args size from a call insn.

--- gcc/dwarf2out.c.orig	2006-03-01 05:13:50.000000000 -0300
+++ gcc/dwarf2out.c	2006-03-01 05:41:38.000000000 -0300
@@ -1069,26 +1069,6 @@ dwarf2out_stack_adjust (rtx insn)
   if (prologue_epilogue_contains (insn) || sibcall_epilogue_contains (insn))
     return;
 
-  if (!flag_asynchronous_unwind_tables && GET_CODE (insn) == CALL_INSN)
-    {
-      /* Extract the size of the args from the CALL rtx itself.  */
-      insn = PATTERN (insn);
-      if (GET_CODE (insn) == PARALLEL)
-	insn = XVECEXP (insn, 0, 0);
-      if (GET_CODE (insn) == SET)
-	insn = SET_SRC (insn);
-      if (GET_CODE (insn) != CALL)
-	abort ();
-
-      dwarf2out_args_size ("", INTVAL (XEXP (insn, 1)));
-      return;
-    }
-
-  /* If only calls can throw, and we have a frame pointer,
-     save up adjustments until we see the CALL_INSN.  */
-  else if (!flag_asynchronous_unwind_tables && cfa.reg != STACK_POINTER_REGNUM)
-    return;
-
   if (GET_CODE (insn) == BARRIER)
     {
       /* When we see a BARRIER, we know to reset args_size to 0.  Usually
@@ -1111,9 +1091,20 @@ dwarf2out_stack_adjust (rtx insn)
 	if (GET_CODE (XVECEXP (PATTERN (insn), 0, i)) == SET)
 	  offset += stack_adjust_offset (XVECEXP (PATTERN (insn), 0, i));
     }
+  else if (GET_CODE (insn) == CALL_INSN)
+    offset = 0;
   else
     return;
 
+  /* We handle this separately because we want stack adjustments in a
+     CALL_INSN to be handled.  */;
+  if (GET_CODE (insn) == CALL_INSN)
+    {
+      /* If only calls can throw, adjust args_size only at call sites.  */
+      if (!flag_asynchronous_unwind_tables)
+	dwarf2out_args_size ("", args_size);
+    }
+
   if (offset == 0)
     return;
 
@@ -1128,6 +1119,16 @@ dwarf2out_stack_adjust (rtx insn)
   if (args_size < 0)
     args_size = 0;
 
+  /* If only calls can throw and we have a frame pointer, we'll save
+     up adjustments until we see the CALL_INSN.  We used to return
+     early and derive args_size from NARGS in the CALL_INSN itself,
+     but that doesn't compute the right value if we have nested call
+     expansions, e.g., stack adjustments for a call have already been
+     emitted, and then we issue another call to compute an argument
+     for the enclosing call (i.e., bar (foo ())).  */
+  if (!flag_asynchronous_unwind_tables && cfa.reg != STACK_POINTER_REGNUM)
+    return;
+
   label = dwarf2out_cfi_label ();
   def_cfa_1 (label, &cfa);
   dwarf2out_args_size (label, args_size);
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