Revert of [runtime] Replace global object link with native context link in all contexts.

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 1783 matching lines @@
   //   x0   alloc_obj       pointer to allocated objects (param map, backing
   //                        store, arguments)
   //   x1   function        function pointer
   //   x2   arg_count_smi   number of function arguments (smi)
   //   x3   recv_arg        pointer to receiver arguments
   //   x4   mapped_params   number of mapped parameters, min(params, args)
   //   x7   param_count     number of function parameters
   //   x11  sloppy_args_map offset to args (or aliased args) map (uninit)
   //   x14  arg_count       number of function arguments
 
+  Register global_object = x10;
   Register global_ctx = x10;
   Register sloppy_args_map = x11;
   Register aliased_args_map = x10;
-  __ Ldr(global_ctx, NativeContextMemOperand());
+  __ Ldr(global_object, GlobalObjectMemOperand());
+  __ Ldr(global_ctx,
+         FieldMemOperand(global_object, JSGlobalObject::kNativeContextOffset));
 
   __ Ldr(sloppy_args_map,
          ContextMemOperand(global_ctx, Context::SLOPPY_ARGUMENTS_MAP_INDEX));
   __ Ldr(
       aliased_args_map,
       ContextMemOperand(global_ctx, Context::FAST_ALIASED_ARGUMENTS_MAP_INDEX));
   __ Cmp(mapped_params, 0);
   __ CmovX(sloppy_args_map, aliased_args_map, ne);
 
   // Copy the JS object part.
@@ skipping 219 matching lines @@
   __ CzeroX(size, eq);
   __ Add(size, size, Heap::kStrictArgumentsObjectSize / kPointerSize);
 
   // Do the allocation of both objects in one go. Assign this to x0, as it will
   // be returned to the caller.
   Register alloc_obj = x0;
   __ Allocate(size, alloc_obj, x11, x12, &runtime,
               static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
 
   // Get the arguments boilerplate from the current (native) context.
+  Register global_object = x10;
+  Register global_ctx = x10;
   Register strict_args_map = x4;
-  __ LoadNativeContextSlot(Context::STRICT_ARGUMENTS_MAP_INDEX,
-                           strict_args_map);
+  __ Ldr(global_object, GlobalObjectMemOperand());
+  __ Ldr(global_ctx,
+         FieldMemOperand(global_object, JSGlobalObject::kNativeContextOffset));
+  __ Ldr(strict_args_map,
+         ContextMemOperand(global_ctx, Context::STRICT_ARGUMENTS_MAP_INDEX));
 
   //   x0   alloc_obj         pointer to allocated objects: parameter array and
   //                          arguments object
   //   x1   function          function pointer
   //   x2   param_count_smi   number of parameters passed to function (smi)
   //   x3   params            pointer to parameters
   //   x4   strict_args_map   offset to arguments map
   //   x13  param_count       number of parameters passed to function
   __ Str(strict_args_map, FieldMemOperand(alloc_obj, JSObject::kMapOffset));
   __ LoadRoot(x5, Heap::kEmptyFixedArrayRootIndex);
@@ skipping 618 matching lines @@
   __ B(&megamorphic);
 
   __ bind(&check_allocation_site);
   // If we came here, we need to see if we are the array function.
   // If we didn't have a matching function, and we didn't find the megamorph
   // sentinel, then we have in the slot either some other function or an
   // AllocationSite.
   __ JumpIfNotRoot(feedback_map, Heap::kAllocationSiteMapRootIndex, &miss);
 
   // Make sure the function is the Array() function
-  __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, scratch1);
+  __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, scratch1);
   __ Cmp(function, scratch1);
   __ B(ne, &megamorphic);
   __ B(&done);
 
   __ Bind(&miss);
 
   // A monomorphic miss (i.e, here the cache is not uninitialized) goes
   // megamorphic.
   __ JumpIfRoot(scratch1, Heap::kuninitialized_symbolRootIndex, &initialize);
   // MegamorphicSentinel is an immortal immovable object (undefined) so no
   // write-barrier is needed.
   __ Bind(&megamorphic);
   __ Add(scratch1, feedback_vector,
          Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ LoadRoot(scratch2, Heap::kmegamorphic_symbolRootIndex);
   __ Str(scratch2, FieldMemOperand(scratch1, FixedArray::kHeaderSize));
   __ B(&done);
 
   // An uninitialized cache is patched with the function or sentinel to
   // indicate the ElementsKind if function is the Array constructor.
   __ Bind(&initialize);
 
   // Make sure the function is the Array() function
-  __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, scratch1);
+  __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, scratch1);
   __ Cmp(function, scratch1);
   __ B(ne, &not_array_function);
 
   // The target function is the Array constructor,
   // Create an AllocationSite if we don't already have it, store it in the
   // slot.
   CreateAllocationSiteStub create_stub(masm->isolate());
   CallStubInRecordCallTarget(masm, &create_stub, argc, function,
                              feedback_vector, index, new_target);
   __ B(&done);
@@ skipping 55 matching lines @@
   // x1 - function
   // x3 - slot id
   // x2 - vector
   // x4 - allocation site (loaded from vector[slot])
   Register function = x1;
   Register feedback_vector = x2;
   Register index = x3;
   Register allocation_site = x4;
   Register scratch = x5;
 
-  __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, scratch);
+  __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, scratch);
   __ Cmp(function, scratch);
   __ B(ne, miss);
 
   __ Mov(x0, Operand(arg_count()));
 
   // Increment the call count for monomorphic function calls.
   __ Add(feedback_vector, feedback_vector,
          Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Add(feedback_vector, feedback_vector,
          Operand(FixedArray::kHeaderSize + kPointerSize));
@@ skipping 114 matching lines @@
   __ bind(&uninitialized);
 
   // We are going monomorphic, provided we actually have a JSFunction.
   __ JumpIfSmi(function, &miss);
 
   // Goto miss case if we do not have a function.
   __ JumpIfNotObjectType(function, x5, x5, JS_FUNCTION_TYPE, &miss);
 
   // Make sure the function is not the Array() function, which requires special
   // behavior on MISS.
-  __ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, x5);
+  __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, x5);
   __ Cmp(function, x5);
   __ B(eq, &miss);
 
-  // Make sure the function belongs to the same native context.
+  // Make sure the function belongs to the same native context (which implies
+  // the same global object).
   __ Ldr(x4, FieldMemOperand(function, JSFunction::kContextOffset));
-  __ Ldr(x4, ContextMemOperand(x4, Context::NATIVE_CONTEXT_INDEX));
-  __ Ldr(x5, NativeContextMemOperand());
+  __ Ldr(x4, ContextMemOperand(x4, Context::GLOBAL_OBJECT_INDEX));
+  __ Ldr(x4, GlobalObjectMemOperand());
   __ Cmp(x4, x5);
   __ B(ne, &miss);
 
   // Update stats.
   __ Ldr(x4, FieldMemOperand(feedback_vector, with_types_offset));
   __ Adds(x4, x4, Operand(Smi::FromInt(1)));
   __ Str(x4, FieldMemOperand(feedback_vector, with_types_offset));
 
   // Initialize the call counter.
   __ Mov(x5, Smi::FromInt(CallICNexus::kCallCountIncrement));
@@ skipping 2852 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64