Add new style of string interpolation optimization: new nodes, working constant folding.

runtime/vm/flow_graph_builder.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_builder.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/bit_vector.h"
 #include "vm/code_descriptors.h"
@@ skipping 2014 matching lines @@
       StoreIndexedInstr* store = new StoreIndexedInstr(
           array, index, for_value.value(),
           emit_store_barrier, index_scale, class_id, deopt_id);
       Do(store);
     }
     ReturnDefinition(ExitTempLocalScope(tmp_var));
   }
 }
 
 
+void EffectGraphVisitor::VisitStringInterpolateNode(
+    StringInterpolateNode* node) {
+  ValueGraphVisitor for_argument(owner(), temp_index());
+  node->value()->Visit(&for_argument);
+  Append(for_argument);
+  StringInterpolateInstr* instr =
+      new StringInterpolateInstr(for_argument.value(), node->token_pos());
+  ReturnDefinition(instr);
+}
+
+
 void EffectGraphVisitor::VisitClosureNode(ClosureNode* node) {
   const Function& function = node->function();
 
   if (function.IsImplicitStaticClosureFunction()) {
     const Instance& closure =
         Instance::ZoneHandle(function.ImplicitStaticClosure());
     ReturnDefinition(new ConstantInstr(closure));
     return;
   }
   if (function.IsNonImplicitClosureFunction()) {
@@ skipping 1794 matching lines @@
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, function_name, reason) + 1;
   char* chars = Isolate::Current()->current_zone()->Alloc<char>(len);
   OS::SNPrint(chars, len, kFormat, function_name, reason);
   const Error& error = Error::Handle(
       LanguageError::New(String::Handle(String::New(chars))));
   Isolate::Current()->long_jump_base()->Jump(1, error);
 }
 
 
 }  // namespace dart