Add a function's initial stack check to the IL instruction stream.

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
diff --git a/runtime/vm/flow_graph_builder.cc b/runtime/vm/flow_graph_builder.cc
index 7aa14cd5c03c8ca549ddda76eefc3ef09f87d3fd..a668d64fece0d77e5f5072d2909389ca05143c31 100644
--- a/runtime/vm/flow_graph_builder.cc
+++ b/runtime/vm/flow_graph_builder.cc
@@ -2298,6 +2298,10 @@ void FlowGraphBuilder::BuildGraph(bool for_optimized, bool use_ssa) {
   TargetEntryInstr* normal_entry = new TargetEntryInstr();
   graph_entry_ = new GraphEntryInstr(normal_entry);
   EffectGraphVisitor for_effect(this, 0);
+  // TODO(kmillikin): We can eliminate stack checks in some cases (e.g., the
+  // stack check on entry for leaf routines).

[srdjan, 2012/08/07 19:04:30]

Yes. Why not skip it if IsLeaf()?

+  for_effect.Do(new CheckStackOverflowComp(function.token_pos(),
+                                           CatchClauseNode::kInvalidTryIndex));
   parsed_function().node_sequence()->Visit(&for_effect);
   AppendFragment(normal_entry, for_effect);
   // Check that the graph is properly terminated.