[turbofan] Support fast access to the current global object.

src/compiler/pipeline.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/pipeline.h"
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <memory>
 #include <sstream>
 
@@ skipping 19 matching lines @@
 #include "src/compiler/graph-trimmer.h"
 #include "src/compiler/graph-visualizer.h"
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-call-reducer.h"
 #include "src/compiler/js-context-specialization.h"
 #include "src/compiler/js-create-lowering.h"
 #include "src/compiler/js-frame-specialization.h"
 #include "src/compiler/js-generic-lowering.h"
-#include "src/compiler/js-global-object-specialization.h"
 #include "src/compiler/js-inlining-heuristic.h"
 #include "src/compiler/js-intrinsic-lowering.h"
 #include "src/compiler/js-native-context-specialization.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/jump-threading.h"
 #include "src/compiler/live-range-separator.h"
 #include "src/compiler/load-elimination.h"
 #include "src/compiler/loop-analysis.h"
 #include "src/compiler/loop-peeling.h"
 #include "src/compiler/loop-variable-optimizer.h"
@@ skipping 732 matching lines @@
     JSCallReducer call_reducer(&graph_reducer, data->jsgraph(),
                                call_reducer_flags, data->native_context(),
                                data->info()->dependencies());
     JSContextSpecialization context_specialization(
         &graph_reducer, data->jsgraph(),
         data->info()->is_function_context_specializing()
             ? handle(data->info()->context())
             : MaybeHandle<Context>());
     JSFrameSpecialization frame_specialization(
         &graph_reducer, data->info()->osr_frame(), data->jsgraph());
-    JSGlobalObjectSpecialization global_object_specialization(
-        &graph_reducer, data->jsgraph(), data->global_object(),
-        data->info()->dependencies());
     JSNativeContextSpecialization::Flags flags =
         JSNativeContextSpecialization::kNoFlags;
     if (data->info()->is_accessor_inlining_enabled()) {
       flags |= JSNativeContextSpecialization::kAccessorInliningEnabled;
     }
     if (data->info()->is_bailout_on_uninitialized()) {
       flags |= JSNativeContextSpecialization::kBailoutOnUninitialized;
     }
     if (data->info()->is_deoptimization_enabled()) {
       flags |= JSNativeContextSpecialization::kDeoptimizationEnabled;
     }
     JSNativeContextSpecialization native_context_specialization(
         &graph_reducer, data->jsgraph(), flags, data->native_context(),
         data->info()->dependencies(), temp_zone);
     JSInliningHeuristic inlining(
         &graph_reducer, data->info()->is_inlining_enabled()
                             ? JSInliningHeuristic::kGeneralInlining
                             : JSInliningHeuristic::kRestrictedInlining,
         temp_zone, data->info(), data->jsgraph(), data->source_positions());
     JSIntrinsicLowering intrinsic_lowering(
         &graph_reducer, data->jsgraph(),
         data->info()->is_deoptimization_enabled()
             ? JSIntrinsicLowering::kDeoptimizationEnabled
             : JSIntrinsicLowering::kDeoptimizationDisabled);
     AddReducer(data, &graph_reducer, &dead_code_elimination);
     AddReducer(data, &graph_reducer, &common_reducer);
     if (data->info()->is_frame_specializing()) {
       AddReducer(data, &graph_reducer, &frame_specialization);
     }
-    if (data->info()->is_deoptimization_enabled()) {
-      AddReducer(data, &graph_reducer, &global_object_specialization);
-    }
     AddReducer(data, &graph_reducer, &native_context_specialization);
     AddReducer(data, &graph_reducer, &context_specialization);
     AddReducer(data, &graph_reducer, &intrinsic_lowering);
     AddReducer(data, &graph_reducer, &call_reducer);
     AddReducer(data, &graph_reducer, &inlining);
     graph_reducer.ReduceGraph();
   }
 };
 
 
@@ skipping 1178 matching lines @@
   data->DeleteRegisterAllocationZone();
 }
 
 CompilationInfo* PipelineImpl::info() const { return data_->info(); }
 
 Isolate* PipelineImpl::isolate() const { return info()->isolate(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8