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

runtime/vm/intermediate_language_mips.cc

 // Copyright (c) 2013, 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/globals.h"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 946 matching lines @@
 
   __ LoadImmediate(result,
                    reinterpret_cast<uword>(Symbols::PredefinedAddress()));
   __ AddImmediate(result, Symbols::kNullCharCodeSymbolOffset * kWordSize);
   __ sll(TMP1, char_code, 1);  // Char code is a smi.
   __ addu(TMP1, TMP1, result);
   __ lw(result, Address(TMP1));
 }
 
 
+LocationSummary* StringInterpolateInstr::MakeLocationSummary() const {
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 0;
+  LocationSummary* summary =
+      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kCall);
+  summary->set_in(0, Location::RegisterLocation(A0));
+  summary->set_out(Location::RegisterLocation(V0));
+  return summary;
+}
+
+
+void StringInterpolateInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  Register array = locs()->in(0).reg();
+  __ Push(array);
+  const int kNumberOfArguments = 1;
+  const Array& kNoArgumentNames = Object::null_array();
+  compiler->GenerateStaticCall(deopt_id(),
+                               token_pos(),
+                               CallFunction(),
+                               kNumberOfArguments,
+                               kNoArgumentNames,
+                               locs());
+  ASSERT(locs()->out().reg() == V0);
+}
+
+
 LocationSummary* LoadUntaggedInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 1;
   return LocationSummary::Make(kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadUntaggedInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register object = locs()->in(0).reg();
@@ skipping 3073 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS