VM: Optimize RegExp.matchAsPrefix(...) by generating a sticky RegExp specialization.

runtime/vm/regexp_assembler_ir.cc

 // Copyright (c) 2014, 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/regexp_assembler_ir.h"
 
 #include "vm/bit_vector.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 299 matching lines @@
 static const bool kEnableUnalignedAccesses = true;
 #endif
 bool IRRegExpMacroAssembler::CanReadUnaligned() {
   return kEnableUnalignedAccesses && !slow_safe();
 }
 
 
 RawArray* IRRegExpMacroAssembler::Execute(const RegExp& regexp,
                                           const String& input,
                                           const Smi& start_offset,
+                                          bool sticky,
                                           Zone* zone) {
   const intptr_t cid = input.GetClassId();
-  const Function& fun = Function::Handle(regexp.function(cid));
+  const Function& fun = Function::Handle(regexp.function(cid, sticky));
   ASSERT(!fun.IsNull());
   // Create the argument list.
   const Array& args =
       Array::Handle(Array::New(RegExpMacroAssembler::kParamCount));
   args.SetAt(RegExpMacroAssembler::kParamRegExpIndex, regexp);
   args.SetAt(RegExpMacroAssembler::kParamStringIndex, input);
   args.SetAt(RegExpMacroAssembler::kParamStartOffsetIndex, start_offset);
 
   // And finally call the generated code.
 
@@ skipping 1509 matching lines @@
 
   return Bind(new (Z) LoadCodeUnitsInstr(pattern_val, index_val, characters,
                                          specialization_cid_,
                                          TokenPosition::kNoSource));
 }
 
 
 #undef __
 
 }  // namespace dart