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Re: [LTO] PATCH: Fix for ICE vector VEC(cgraph_node_ptr,base) index domain error


Diego Novillo wrote:
On Thu, Oct 23, 2008 at 05:38, Simon Baldwin <simonb@google.com> wrote:

2008-10-22 Simon Baldwin <simonb@google.com>

* lto-lang.c: (input_node): Save the node reference, rather than the
node pointer, in node->inlined_to.
(fixup_cgraph_nodes): New function, convert node references into
node pointers.
(input_cgraph_1): Call fixup_cgraph_nodes.

OK.

Thanks. However, changes between revs 141263 and 141308 mean that I've had to juggle it about a fair bit since emailing.


Would you mind taking a look at the revised version, appended below -- broadly the same, just a little more direct. Thanks.

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Callgraph nodes are not necessarily written out in such an order that an
inlined function can always locate the function that inlines it.  Sometimes,
the function that inlines it has not yet been read.

This patch addresses that by deferring node lookup by reference until all of
the callgraph nodes have been read, and fixes the following:

  extern inline void __attribute__((__always_inline__)) func(void) { }
  void f(void) { func(); }

  $ gcc -c -fwhopr -o f.o f.c
  $ gcc -shared -fwhopr -o f.so f.o
  lto1: internal compiler error: vector VEC(cgraph_node_ptr,base) index
  domain error, in input_node at lto/lto-lang.c:1216


gcc/lto/ChangeLog
2008-10-23  Simon Baldwin  <simonb@google.com>

	* lto-lang.c: (input_node): Save the node reference, rather than the
	node pointer, in node->inlined_to.
	(input_cgraph_1): Convert node references into node pointers.


Index: gcc/lto/lto-lang.c
===================================================================
--- gcc/lto/lto-lang.c	(revision 141320)
+++ gcc/lto/lto-lang.c	(working copy)
@@ -1185,10 +1185,10 @@ input_node (struct lto_file_decl_data* f
       node->global.estimated_stack_size = estimated_stack_size;
       node->global.stack_frame_offset = stack_frame_offset;
       node->global.insns = insns;
-      if (ref != LCC_NOT_FOUND)
-	node->global.inlined_to = VEC_index (cgraph_node_ptr, nodes, ref);
-      else
-	node->global.inlined_to = NULL;
+
+      /* Store a reference for now, and fix up later to be a pointer.  */
+      node->global.inlined_to = (cgraph_node_ptr) ref;
+
       node->global.estimated_growth = estimated_growth;
       node->global.inlined = inlined;
     }
@@ -1302,7 +1302,7 @@ input_cgraph_1 (struct lto_file_decl_dat
       LTO_DEBUG_INDENT (tag);
 
       if (tag == LTO_cgraph_edge)
-	  input_edge (ib, nodes);
+        input_edge (ib, nodes);
       else 
 	{
 	  node = input_node (file_data, ib, tag, nodes);
@@ -1315,6 +1315,20 @@ input_cgraph_1 (struct lto_file_decl_dat
       tag = lto_input_uleb128 (ib);
     }
 
+  if (flag_ltrans)
+    {
+      for (node = cgraph_nodes; node; node = node->next)
+        {
+          const int ref = (int) node->global.inlined_to;
+
+          /* Fixup inlined_to from reference to pointer.  */
+          if (ref != LCC_NOT_FOUND)
+            node->global.inlined_to = VEC_index (cgraph_node_ptr, nodes, ref);
+          else
+            node->global.inlined_to = NULL;
+        }
+    }
+
   for (node = cgraph_nodes; node; node = node->next)
     {
       tree prevailing = lto_symtab_prevailing_decl (node->decl);

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