stmt.c (start_cleanup_deferal, [...]): Test block_stack before dereferencing it.

	* stmt.c (start_cleanup_deferal, end_cleanup_deferal): Test
	block_stack before dereferencing it.

From-SVN: r14861

gcc/ChangeLog

-Wed Aug 20 14:57:11 1997  Michael Meissner  <meissner@cygnus.com>
+Wed Aug 20 11:58:33 1997  Jim Wilson  <wilson@cygnus.com>
+
+	* stmt.c (start_cleanup_deferal, end_cleanup_deferal): Test
+	block_stack before dereferencing it.
+
+Wed Aug 20 11:57:11 1997  Michael Meissner  <meissner@cygnus.com>
 
 	* rs6000.h (ISSUE_RATE): Define instead of MACHINE_issue_rate.
 

gcc/stmt.c

@@ -4212,7 +4212,10 @@ expand_cleanups (list, dont_do, in_fixup, reachable)
 void
 start_cleanup_deferal ()
 {
-  ++block_stack->data.block.conditional_code;
+  /* block_stack can be NULL if we are inside the parameter list.  It is
+     OK to do nothing, because cleanups aren't possible here.  */
+  if (block_stack)
+    ++block_stack->data.block.conditional_code;
 }
 
 /* Mark the end of a conditional region of code.  Because cleanup
@@ -4223,7 +4226,10 @@ start_cleanup_deferal ()
 void
 end_cleanup_deferal ()
 {
-  --block_stack->data.block.conditional_code;
+  /* block_stack can be NULL if we are inside the parameter list.  It is
+     OK to do nothing, because cleanups aren't possible here.  */
+  if (block_stack)
+    --block_stack->data.block.conditional_code;
 }
 
 /* Move all cleanups from the current block_stack