Add ObjectPool tag for external labels. Use LoadExternalLabel for native calls...

runtime/vm/intermediate_language_x64.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_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 763 matching lines @@
 
   // Push the result place holder initialized to NULL.
   __ PushObject(Object::null_object());
   // Pass a pointer to the first argument in RAX.
   if (!function().HasOptionalParameters()) {
     __ leaq(RAX, Address(RBP, (kParamEndSlotFromFp +
                                function().NumParameters()) * kWordSize));
   } else {
     __ leaq(RAX, Address(RBP, kFirstLocalSlotFromFp * kWordSize));
   }
-  __ LoadImmediate(
-      RBX, Immediate(reinterpret_cast<uword>(native_c_function())));
+  ExternalLabel label(reinterpret_cast<uword>(native_c_function()));
+  __ LoadExternalLabel(RBX, &label, kNotPatchable);
   __ LoadImmediate(R10, Immediate(argc_tag));
   const StubEntry& stub_entry = (is_bootstrap_native() || is_leaf_call) ?
       *StubCode::CallBootstrapCFunction_entry() :
       *StubCode::CallNativeCFunction_entry();
   compiler->GenerateCall(token_pos(),
                          stub_entry,
                          RawPcDescriptors::kOther,
                          locs());
   __ popq(result);
 }
@@ skipping 19 matching lines @@
                                kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void StringFromCharCodeInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(compiler->is_optimizing());
   Register char_code = locs()->in(0).reg();
   Register result = locs()->out(0).reg();
-  __ LoadImmediate(result,
-      Immediate(reinterpret_cast<uword>(Symbols::PredefinedAddress())));
+
+  ExternalLabel label(reinterpret_cast<uword>(Symbols::PredefinedAddress()));
+  __ LoadExternalLabel(result, &label, kNotPatchable);
   __ movq(result, Address(result,
                           char_code,
                           TIMES_HALF_WORD_SIZE,  // Char code is a smi.
                           Symbols::kNullCharCodeSymbolOffset * kWordSize));
 }
 
 
 LocationSummary* StringToCharCodeInstr::MakeLocationSummary(Zone* zone,
                                                             bool opt) const {
   const intptr_t kNumInputs = 1;
@@ skipping 5593 matching lines @@
   __ Drop(1);
   __ popq(result);
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64