DBC: Support large offsets in optimized field access.

runtime/vm/flow_graph_compiler_dbc.cc

 // Copyright (c) 2016, 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_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 253 matching lines @@
         (defn->tag() != Instruction::kDropTemps) &&
         !defn->HasTemp()) {
       __ Drop1();
     }
   }
 }
 
 
 void FlowGraphCompiler::GenerateInlinedGetter(intptr_t offset) {
   __ Move(0, -(1 + kParamEndSlotFromFp));
-  __ LoadField(0, 0, offset / kWordSize);
+  ASSERT(offset % kWordSize == 0);
+  if (Utils::IsInt(8, offset/ kWordSize)) {
+    __ LoadField(0, 0, offset / kWordSize);
+  } else {
+    __ LoadFieldExt(0, 0);
+    __ Nop(offset / kWordSize);
+  }
   __ Return(0);
 }
 
 
 void FlowGraphCompiler::GenerateInlinedSetter(intptr_t offset) {
   __ Move(0, -(2 + kParamEndSlotFromFp));
   __ Move(1, -(1 + kParamEndSlotFromFp));
-  __ StoreField(0, offset / kWordSize, 1);
+  ASSERT(offset % kWordSize == 0);
+  if (Utils::IsInt(8, offset/ kWordSize)) {
+    __ StoreField(0, offset / kWordSize, 1);
+  } else {
+    __ StoreFieldExt(0, 1);
+    __ Nop(offset / kWordSize);
+  }
   __ LoadConstant(0, Object::Handle());
   __ Return(0);
 }
 
 
 void FlowGraphCompiler::EmitFrameEntry() {
   const Function& function = parsed_function().function();
   const intptr_t num_fixed_params = function.num_fixed_parameters();
   const int num_opt_pos_params = function.NumOptionalPositionalParameters();
   const int num_opt_named_params = function.NumOptionalNamedParameters();
@@ skipping 233 matching lines @@
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   UNIMPLEMENTED();
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC