VM: Improve generated code for loading the current context.

runtime/vm/intermediate_language_arm64.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/globals.h"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 5334 matching lines @@
   }
 
   // We can fall through if the successor is the next block in the list.
   // Otherwise, we need a jump.
   if (!compiler->CanFallThroughTo(successor())) {
     __ b(compiler->GetJumpLabel(successor()));
   }
 }
 
 
-LocationSummary* CurrentContextInstr::MakeLocationSummary(Isolate* isolate,
-                                                          bool opt) const {
-  return LocationSummary::Make(isolate,
-                               0,
-                               Location::RequiresRegister(),
-                               LocationSummary::kNoCall);
-}
-
-
-void CurrentContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  __ mov(locs()->out(0).reg(), CTX);
-}
-
-
 LocationSummary* StrictCompareInstr::MakeLocationSummary(Isolate* isolate,
                                                          bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   if (needs_number_check()) {
     LocationSummary* locs = new(isolate) LocationSummary(
         isolate, kNumInputs, kNumTemps, LocationSummary::kCall);
     locs->set_in(0, Location::RegisterLocation(R0));
     locs->set_in(1, Location::RegisterLocation(R1));
     locs->set_out(0, Location::RegisterLocation(R0));
@@ skipping 116 matching lines @@
   compiler->GenerateCall(token_pos(), &label, stub_kind_, locs());
 #if defined(DEBUG)
   __ LoadImmediate(R4, kInvalidObjectPointer, kNoPP);
   __ LoadImmediate(R5, kInvalidObjectPointer, kNoPP);
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64