Put live register bits in stackmaps.

runtime/vm/flow_graph_compiler_x64.cc

Index: runtime/vm/flow_graph_compiler_x64.cc
diff --git a/runtime/vm/flow_graph_compiler_x64.cc b/runtime/vm/flow_graph_compiler_x64.cc
index 13a44e662f352e9a3a92a694d7f90175db760251..0aef5485745b75a40cd03bf530f17b88c2b10c44 100644
--- a/runtime/vm/flow_graph_compiler_x64.cc
+++ b/runtime/vm/flow_graph_compiler_x64.cc
@@ -802,7 +802,8 @@ void FlowGraphCompiler::CopyParameters() {
   }
   if (is_optimizing()) {
     stackmap_table_builder_->AddEntry(assembler()->CodeSize(),
-                                      empty_stack_bitmap);
+                                      empty_stack_bitmap,
+                                      0);

[Vyacheslav Egorov (Google), 2012/08/27 14:54:51]

I wonder if it would not be cleaner to pass RegisterSet instead of RegisterCount
into AddEntry?

[Kevin Millikin (Google), 2012/08/29 12:40:41]

At some point we have to unpack it into something more low level --- right now
that happens in the code generator and I don't really think it's obviously
better to do it in the stackmap table builder.  It's missing access to the code
generator's state.

   }
 
   if (FLAG_trace_functions) {
@@ -817,7 +818,8 @@ void FlowGraphCompiler::CopyParameters() {
                          CatchClauseNode::kInvalidTryIndex);
     if (is_optimizing()) {
       stackmap_table_builder_->AddEntry(assembler()->CodeSize(),
-                                        empty_stack_bitmap);
+                                        empty_stack_bitmap,
+                                        0);
     }
     __ popq(RAX);  // Remove argument.
     __ popq(RAX);  // Restore result.