Refactor to support multiple outputs in location summary

runtime/vm/flow_graph_compiler.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_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/cha.h"
 #include "vm/dart_entry.h"
@@ skipping 898 matching lines @@
 
   for (intptr_t i = 0; i < locs->temp_count(); i++) {
     Location loc = locs->temp(i);
     if (loc.IsRegister()) {
       // Check that a register is not specified twice in the summary.
       ASSERT(!blocked_registers[loc.reg()]);
       blocked_registers[loc.reg()] = true;
     }
   }
 
-  if (locs->out().IsRegister()) {
+  if (locs->out(0).IsRegister()) {
     // Fixed output registers are allowed to overlap with
     // temps and inputs.
-    blocked_registers[locs->out().reg()] = true;
+    blocked_registers[locs->out(0).reg()] = true;
   }
 
   // Do not allocate known registers.
   blocked_registers[CTX] = true;
   blocked_registers[SPREG] = true;
   blocked_registers[FPREG] = true;
   if (TMP != kNoRegister) {
     blocked_registers[TMP] = true;
   }
   if (PP != kNoRegister) {
@@ skipping 36 matching lines @@
   for (intptr_t i = 0; i < locs->temp_count(); i++) {
     Location loc = locs->temp(i);
     if (loc.IsUnallocated()) {
       ASSERT(loc.policy() == Location::kRequiresRegister);
       loc = Location::RegisterLocation(
         AllocateFreeRegister(blocked_registers));
       locs->set_temp(i, loc);
     }
   }
 
-  Location result_location = locs->out();
+  Location result_location = locs->out(0);
   if (result_location.IsUnallocated()) {
     switch (result_location.policy()) {
       case Location::kAny:
       case Location::kPrefersRegister:
       case Location::kRequiresRegister:
       case Location::kWritableRegister:
         result_location = Location::RegisterLocation(
             AllocateFreeRegister(blocked_registers));
         break;
       case Location::kSameAsFirstInput:
         result_location = locs->in(0);
         break;
       case Location::kRequiresFpuRegister:
         UNREACHABLE();
         break;
     }
-    locs->set_out(result_location);
+    locs->set_out(0, result_location);
   }
 }
 
 
 ParallelMoveResolver::ParallelMoveResolver(FlowGraphCompiler* compiler)
     : compiler_(compiler), moves_(32) {}
 
 
 void ParallelMoveResolver::EmitNativeCode(ParallelMoveInstr* parallel_move) {
   ASSERT(moves_.is_empty());
@@ skipping 252 matching lines @@
 
   for (int i = 0; i < len; i++) {
     sorted->Add(CidTarget(ic_data.GetReceiverClassIdAt(i),
                           &Function::ZoneHandle(ic_data.GetTargetAt(i)),
                           ic_data.GetCountAt(i)));
   }
   sorted->Sort(HighestCountFirst);
 }
 
 }  // namespace dart