Rename A64 port to ARM64 port

src/a64/builtins-a64.cc

Index: src/a64/builtins-a64.cc
diff --git a/src/a64/builtins-a64.cc b/src/a64/builtins-a64.cc
deleted file mode 100644
index ec452da4795724fa9ef29cdf8acceb9871771e76..0000000000000000000000000000000000000000
--- a/src/a64/builtins-a64.cc
+++ /dev/null
@@ -1,1562 +0,0 @@
-// Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if V8_TARGET_ARCH_A64
-
-#include "codegen.h"
-#include "debug.h"
-#include "deoptimizer.h"
-#include "full-codegen.h"
-#include "runtime.h"
-#include "stub-cache.h"
-
-namespace v8 {
-namespace internal {
-
-
-#define __ ACCESS_MASM(masm)
-
-
-// Load the built-in Array function from the current context.
-static void GenerateLoadArrayFunction(MacroAssembler* masm, Register result) {
-  // Load the native context.
-  __ Ldr(result, GlobalObjectMemOperand());
-  __ Ldr(result,
-         FieldMemOperand(result, GlobalObject::kNativeContextOffset));
-  // Load the InternalArray function from the native context.
-  __ Ldr(result,
-         MemOperand(result,
-                    Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX)));
-}
-
-
-// Load the built-in InternalArray function from the current context.
-static void GenerateLoadInternalArrayFunction(MacroAssembler* masm,
-                                              Register result) {
-  // Load the native context.
-  __ Ldr(result, GlobalObjectMemOperand());
-  __ Ldr(result,
-         FieldMemOperand(result, GlobalObject::kNativeContextOffset));
-  // Load the InternalArray function from the native context.
-  __ Ldr(result, ContextMemOperand(result,
-                                   Context::INTERNAL_ARRAY_FUNCTION_INDEX));
-}
-
-
-void Builtins::Generate_Adaptor(MacroAssembler* masm,
-                                CFunctionId id,
-                                BuiltinExtraArguments extra_args) {
-  // ----------- S t a t e -------------
-  //  -- x0                 : number of arguments excluding receiver
-  //  -- x1                 : called function (only guaranteed when
-  //                          extra_args requires it)
-  //  -- cp                 : context
-  //  -- sp[0]              : last argument
-  //  -- ...
-  //  -- sp[4 * (argc - 1)] : first argument (argc == x0)
-  //  -- sp[4 * argc]       : receiver
-  // -----------------------------------
-
-  // Insert extra arguments.
-  int num_extra_args = 0;
-  if (extra_args == NEEDS_CALLED_FUNCTION) {
-    num_extra_args = 1;
-    __ Push(x1);
-  } else {
-    ASSERT(extra_args == NO_EXTRA_ARGUMENTS);
-  }
-
-  // JumpToExternalReference expects x0 to contain the number of arguments
-  // including the receiver and the extra arguments.
-  __ Add(x0, x0, num_extra_args + 1);
-  __ JumpToExternalReference(ExternalReference(id, masm->isolate()));
-}
-
-
-void Builtins::Generate_InternalArrayCode(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- x0     : number of arguments
-  //  -- lr     : return address
-  //  -- sp[...]: constructor arguments
-  // -----------------------------------
-  ASM_LOCATION("Builtins::Generate_InternalArrayCode");
-  Label generic_array_code;
-
-  // Get the InternalArray function.
-  GenerateLoadInternalArrayFunction(masm, x1);
-
-  if (FLAG_debug_code) {
-    // Initial map for the builtin InternalArray functions should be maps.
-    __ Ldr(x10, FieldMemOperand(x1, JSFunction::kPrototypeOrInitialMapOffset));
-    __ Tst(x10, kSmiTagMask);
-    __ Assert(ne, kUnexpectedInitialMapForInternalArrayFunction);
-    __ CompareObjectType(x10, x11, x12, MAP_TYPE);
-    __ Assert(eq, kUnexpectedInitialMapForInternalArrayFunction);
-  }
-
-  // Run the native code for the InternalArray function called as a normal
-  // function.
-  InternalArrayConstructorStub stub(masm->isolate());
-  __ TailCallStub(&stub);
-}
-
-
-void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- x0     : number of arguments
-  //  -- lr     : return address
-  //  -- sp[...]: constructor arguments
-  // -----------------------------------
-  ASM_LOCATION("Builtins::Generate_ArrayCode");
-  Label generic_array_code, one_or_more_arguments, two_or_more_arguments;
-
-  // Get the Array function.
-  GenerateLoadArrayFunction(masm, x1);
-
-  if (FLAG_debug_code) {
-    // Initial map for the builtin Array functions should be maps.
-    __ Ldr(x10, FieldMemOperand(x1, JSFunction::kPrototypeOrInitialMapOffset));
-    __ Tst(x10, kSmiTagMask);
-    __ Assert(ne, kUnexpectedInitialMapForArrayFunction);
-    __ CompareObjectType(x10, x11, x12, MAP_TYPE);
-    __ Assert(eq, kUnexpectedInitialMapForArrayFunction);
-  }
-
-  // Run the native code for the Array function called as a normal function.
-  __ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
-  ArrayConstructorStub stub(masm->isolate());
-  __ TailCallStub(&stub);
-}
-
-
-void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- x0                     : number of arguments
-  //  -- x1                     : constructor function
-  //  -- lr                     : return address
-  //  -- sp[(argc - n - 1) * 8] : arg[n] (zero based)
-  //  -- sp[argc * 8]           : receiver
-  // -----------------------------------
-  ASM_LOCATION("Builtins::Generate_StringConstructCode");
-  Counters* counters = masm->isolate()->counters();
-  __ IncrementCounter(counters->string_ctor_calls(), 1, x10, x11);
-
-  Register argc = x0;
-  Register function = x1;
-  if (FLAG_debug_code) {
-    __ LoadGlobalFunction(Context::STRING_FUNCTION_INDEX, x10);
-    __ Cmp(function, x10);
-    __ Assert(eq, kUnexpectedStringFunction);
-  }
-
-  // Load the first arguments in x0 and get rid of the rest.
-  Label no_arguments;
-  __ Cbz(argc, &no_arguments);
-  // First args = sp[(argc - 1) * 8].
-  __ Sub(argc, argc, 1);
-  __ Claim(argc, kXRegSize);
-  // jssp now point to args[0], load and drop args[0] + receiver.
-  Register arg = argc;
-  __ Ldr(arg, MemOperand(jssp, 2 * kPointerSize, PostIndex));
-  argc = NoReg;
-
-  Register argument = x2;
-  Label not_cached, argument_is_string;
-  __ LookupNumberStringCache(arg,        // Input.
-                             argument,   // Result.
-                             x10,        // Scratch.
-                             x11,        // Scratch.
-                             x12,        // Scratch.
-                             &not_cached);
-  __ IncrementCounter(counters->string_ctor_cached_number(), 1, x10, x11);
-  __ Bind(&argument_is_string);
-
-  // ----------- S t a t e -------------
-  //  -- x2     : argument converted to string
-  //  -- x1     : constructor function
-  //  -- lr     : return address
-  // -----------------------------------
-
-  Label gc_required;
-  Register new_obj = x0;
-  __ Allocate(JSValue::kSize, new_obj, x10, x11, &gc_required, TAG_OBJECT);
-
-  // Initialize the String object.
-  Register map = x3;
-  __ LoadGlobalFunctionInitialMap(function, map, x10);
-  if (FLAG_debug_code) {
-    __ Ldrb(x4, FieldMemOperand(map, Map::kInstanceSizeOffset));
-    __ Cmp(x4, JSValue::kSize >> kPointerSizeLog2);
-    __ Assert(eq, kUnexpectedStringWrapperInstanceSize);
-    __ Ldrb(x4, FieldMemOperand(map, Map::kUnusedPropertyFieldsOffset));
-    __ Cmp(x4, 0);
-    __ Assert(eq, kUnexpectedUnusedPropertiesOfStringWrapper);
-  }
-  __ Str(map, FieldMemOperand(new_obj, HeapObject::kMapOffset));
-
-  Register empty = x3;
-  __ LoadRoot(empty, Heap::kEmptyFixedArrayRootIndex);
-  __ Str(empty, FieldMemOperand(new_obj, JSObject::kPropertiesOffset));
-  __ Str(empty, FieldMemOperand(new_obj, JSObject::kElementsOffset));
-
-  __ Str(argument, FieldMemOperand(new_obj, JSValue::kValueOffset));
-
-  // Ensure the object is fully initialized.
-  STATIC_ASSERT(JSValue::kSize == (4 * kPointerSize));
-
-  __ Ret();
-
-  // The argument was not found in the number to string cache. Check
-  // if it's a string already before calling the conversion builtin.
-  Label convert_argument;
-  __ Bind(&not_cached);
-  __ JumpIfSmi(arg, &convert_argument);
-
-  // Is it a String?
-  __ Ldr(x10, FieldMemOperand(x0, HeapObject::kMapOffset));
-  __ Ldrb(x11, FieldMemOperand(x10, Map::kInstanceTypeOffset));
-  __ Tbnz(x11, MaskToBit(kIsNotStringMask), &convert_argument);
-  __ Mov(argument, arg);
-  __ IncrementCounter(counters->string_ctor_string_value(), 1, x10, x11);
-  __ B(&argument_is_string);
-
-  // Invoke the conversion builtin and put the result into x2.
-  __ Bind(&convert_argument);
-  __ Push(function);  // Preserve the function.
-  __ IncrementCounter(counters->string_ctor_conversions(), 1, x10, x11);
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    __ Push(arg);
-    __ InvokeBuiltin(Builtins::TO_STRING, CALL_FUNCTION);
-  }
-  __ Pop(function);
-  __ Mov(argument, x0);
-  __ B(&argument_is_string);
-
-  // Load the empty string into x2, remove the receiver from the
-  // stack, and jump back to the case where the argument is a string.
-  __ Bind(&no_arguments);
-  __ LoadRoot(argument, Heap::kempty_stringRootIndex);
-  __ Drop(1);
-  __ B(&argument_is_string);
-
-  // At this point the argument is already a string. Call runtime to create a
-  // string wrapper.
-  __ Bind(&gc_required);
-  __ IncrementCounter(counters->string_ctor_gc_required(), 1, x10, x11);
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    __ Push(argument);
-    __ CallRuntime(Runtime::kNewStringWrapper, 1);
-  }
-  __ Ret();
-}
-
-
-static void CallRuntimePassFunction(MacroAssembler* masm,
-                                    Runtime::FunctionId function_id) {
-  FrameScope scope(masm, StackFrame::INTERNAL);
-  //   - Push a copy of the function onto the stack.
-  //   - Push another copy as a parameter to the runtime call.
-  __ Push(x1, x1);
-
-  __ CallRuntime(function_id, 1);
-
-  //   - Restore receiver.
-  __ Pop(x1);
-}
-
-
-static void GenerateTailCallToSharedCode(MacroAssembler* masm) {
-  __ Ldr(x2, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
-  __ Ldr(x2, FieldMemOperand(x2, SharedFunctionInfo::kCodeOffset));
-  __ Add(x2, x2, Code::kHeaderSize - kHeapObjectTag);
-  __ Br(x2);
-}
-
-
-static void GenerateTailCallToReturnedCode(MacroAssembler* masm) {
-  __ Add(x0, x0, Code::kHeaderSize - kHeapObjectTag);
-  __ Br(x0);
-}
-
-
-void Builtins::Generate_InOptimizationQueue(MacroAssembler* masm) {
-  // Checking whether the queued function is ready for install is optional,
-  // since we come across interrupts and stack checks elsewhere. However, not
-  // checking may delay installing ready functions, and always checking would be
-  // quite expensive. A good compromise is to first check against stack limit as
-  // a cue for an interrupt signal.
-  Label ok;
-  __ CompareRoot(masm->StackPointer(), Heap::kStackLimitRootIndex);
-  __ B(hs, &ok);
-
-  CallRuntimePassFunction(masm, Runtime::kTryInstallOptimizedCode);
-  GenerateTailCallToReturnedCode(masm);
-
-  __ Bind(&ok);
-  GenerateTailCallToSharedCode(masm);
-}
-
-
-static void Generate_JSConstructStubHelper(MacroAssembler* masm,
-                                           bool is_api_function,
-                                           bool count_constructions,
-                                           bool create_memento) {
-  // ----------- S t a t e -------------
-  //  -- x0     : number of arguments
-  //  -- x1     : constructor function
-  //  -- x2     : allocation site or undefined
-  //  -- lr     : return address
-  //  -- sp[...]: constructor arguments
-  // -----------------------------------
-
-  ASM_LOCATION("Builtins::Generate_JSConstructStubHelper");
-  // Should never count constructions for api objects.
-  ASSERT(!is_api_function || !count_constructions);
-  // Should never create mementos for api functions.
-  ASSERT(!is_api_function || !create_memento);
-  // Should never create mementos before slack tracking is finished.
-  ASSERT(!count_constructions || !create_memento);
-
-  Isolate* isolate = masm->isolate();
-
-  // Enter a construct frame.
-  {
-    FrameScope scope(masm, StackFrame::CONSTRUCT);
-
-    // Preserve the three incoming parameters on the stack.
-    if (create_memento) {
-      __ AssertUndefinedOrAllocationSite(x2, x10);
-      __ Push(x2);
-    }
-
-    Register argc = x0;
-    Register constructor = x1;
-    // x1: constructor function
-    __ SmiTag(argc);
-    __ Push(argc, constructor);
-    // sp[0] : Constructor function.
-    // sp[1]: number of arguments (smi-tagged)
-
-    // Try to allocate the object without transitioning into C code. If any of
-    // the preconditions is not met, the code bails out to the runtime call.
-    Label rt_call, allocated;
-    if (FLAG_inline_new) {
-      Label undo_allocation;
-#if ENABLE_DEBUGGER_SUPPORT
-      ExternalReference debug_step_in_fp =
-          ExternalReference::debug_step_in_fp_address(isolate);
-      __ Mov(x2, Operand(debug_step_in_fp));
-      __ Ldr(x2, MemOperand(x2));
-      __ Cbnz(x2, &rt_call);
-#endif
-      // Load the initial map and verify that it is in fact a map.
-      Register init_map = x2;
-      __ Ldr(init_map,
-             FieldMemOperand(constructor,
-                             JSFunction::kPrototypeOrInitialMapOffset));
-      __ JumpIfSmi(init_map, &rt_call);
-      __ JumpIfNotObjectType(init_map, x10, x11, MAP_TYPE, &rt_call);
-
-      // Check that the constructor is not constructing a JSFunction (see
-      // comments in Runtime_NewObject in runtime.cc). In which case the initial
-      // map's instance type would be JS_FUNCTION_TYPE.
-      __ CompareInstanceType(init_map, x10, JS_FUNCTION_TYPE);
-      __ B(eq, &rt_call);
-
-      if (count_constructions) {
-        Label allocate;
-        // Decrease generous allocation count.
-        __ Ldr(x3, FieldMemOperand(constructor,
-                                   JSFunction::kSharedFunctionInfoOffset));
-        MemOperand constructor_count =
-            FieldMemOperand(x3, SharedFunctionInfo::kConstructionCountOffset);
-        __ Ldrb(x4, constructor_count);
-        __ Subs(x4, x4, 1);
-        __ Strb(x4, constructor_count);
-        __ B(ne, &allocate);
-
-        // Push the constructor and map to the stack, and the constructor again
-        // as argument to the runtime call.
-        __ Push(constructor, init_map, constructor);
-        // The call will replace the stub, so the countdown is only done once.
-        __ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
-        __ Pop(init_map, constructor);
-        __ Bind(&allocate);
-      }
-
-      // Now allocate the JSObject on the heap.
-      Register obj_size = x3;
-      Register new_obj = x4;
-      __ Ldrb(obj_size, FieldMemOperand(init_map, Map::kInstanceSizeOffset));
-      if (create_memento) {
-        __ Add(x7, obj_size,
-               Operand(AllocationMemento::kSize / kPointerSize));
-        __ Allocate(x7, new_obj, x10, x11, &rt_call, SIZE_IN_WORDS);
-      } else {
-        __ Allocate(obj_size, new_obj, x10, x11, &rt_call, SIZE_IN_WORDS);
-      }
-
-      // Allocated the JSObject, now initialize the fields. Map is set to
-      // initial map and properties and elements are set to empty fixed array.
-      // NB. the object pointer is not tagged, so MemOperand is used.
-      Register empty = x5;
-      __ LoadRoot(empty, Heap::kEmptyFixedArrayRootIndex);
-      __ Str(init_map, MemOperand(new_obj, JSObject::kMapOffset));
-      STATIC_ASSERT(JSObject::kElementsOffset ==
-          (JSObject::kPropertiesOffset + kPointerSize));
-      __ Stp(empty, empty, MemOperand(new_obj, JSObject::kPropertiesOffset));
-
-      Register first_prop = x5;
-      __ Add(first_prop, new_obj, JSObject::kHeaderSize);
-
-      // Fill all of the in-object properties with the appropriate filler.
-      Register undef = x7;
-      __ LoadRoot(undef, Heap::kUndefinedValueRootIndex);
-
-      // Obtain number of pre-allocated property fields and in-object
-      // properties.
-      Register prealloc_fields = x10;
-      Register inobject_props = x11;
-      Register inst_sizes = x11;
-      __ Ldr(inst_sizes, FieldMemOperand(init_map, Map::kInstanceSizesOffset));
-      __ Ubfx(prealloc_fields, inst_sizes,
-              Map::kPreAllocatedPropertyFieldsByte * kBitsPerByte,
-              kBitsPerByte);
-      __ Ubfx(inobject_props, inst_sizes,
-              Map::kInObjectPropertiesByte * kBitsPerByte, kBitsPerByte);
-
-      // Calculate number of property fields in the object.
-      Register prop_fields = x6;
-      __ Sub(prop_fields, obj_size, JSObject::kHeaderSize / kPointerSize);
-
-      if (count_constructions) {
-        // Fill the pre-allocated fields with undef.
-        __ FillFields(first_prop, prealloc_fields, undef);
-
-        // Register first_non_prealloc is the offset of the first field after
-        // pre-allocated fields.
-        Register first_non_prealloc = x12;
-        __ Add(first_non_prealloc, first_prop,
-               Operand(prealloc_fields, LSL, kPointerSizeLog2));
-
-        first_prop = NoReg;
-
-        if (FLAG_debug_code) {
-          Register obj_end = x5;
-          __ Add(obj_end, new_obj, Operand(obj_size, LSL, kPointerSizeLog2));
-          __ Cmp(first_non_prealloc, obj_end);
-          __ Assert(le, kUnexpectedNumberOfPreAllocatedPropertyFields);
-        }
-
-        // Fill the remaining fields with one pointer filler map.
-        Register one_pointer_filler = x5;
-        Register non_prealloc_fields = x6;
-        __ LoadRoot(one_pointer_filler, Heap::kOnePointerFillerMapRootIndex);
-        __ Sub(non_prealloc_fields, prop_fields, prealloc_fields);
-        __ FillFields(first_non_prealloc, non_prealloc_fields,
-                      one_pointer_filler);
-        prop_fields = NoReg;
-      } else if (create_memento) {
-        // Fill the pre-allocated fields with undef.
-        __ FillFields(first_prop, prop_fields, undef);
-        __ Add(first_prop, new_obj, Operand(obj_size, LSL, kPointerSizeLog2));
-        __ LoadRoot(x14, Heap::kAllocationMementoMapRootIndex);
-        ASSERT_EQ(0 * kPointerSize, AllocationMemento::kMapOffset);
-        __ Str(x14, MemOperand(first_prop, kPointerSize, PostIndex));
-        // Load the AllocationSite
-        __ Peek(x14, 2 * kXRegSize);
-        ASSERT_EQ(1 * kPointerSize, AllocationMemento::kAllocationSiteOffset);
-        __ Str(x14, MemOperand(first_prop, kPointerSize, PostIndex));
-        first_prop = NoReg;
-      } else {
-        // Fill all of the property fields with undef.
-        __ FillFields(first_prop, prop_fields, undef);
-        first_prop = NoReg;
-        prop_fields = NoReg;
-      }
-
-      // Add the object tag to make the JSObject real, so that we can continue
-      // and jump into the continuation code at any time from now on. Any
-      // failures need to undo the allocation, so that the heap is in a
-      // consistent state and verifiable.
-      __ Add(new_obj, new_obj, kHeapObjectTag);
-
-      // Check if a non-empty properties array is needed. Continue with
-      // allocated object if not, or fall through to runtime call if it is.
-      Register element_count = x3;
-      __ Ldrb(element_count,
-              FieldMemOperand(init_map, Map::kUnusedPropertyFieldsOffset));
-      // The field instance sizes contains both pre-allocated property fields
-      // and in-object properties.
-      __ Add(element_count, element_count, prealloc_fields);
-      __ Subs(element_count, element_count, inobject_props);
-
-      // Done if no extra properties are to be allocated.
-      __ B(eq, &allocated);
-      __ Assert(pl, kPropertyAllocationCountFailed);
-
-      // Scale the number of elements by pointer size and add the header for
-      // FixedArrays to the start of the next object calculation from above.
-      Register new_array = x5;
-      Register array_size = x6;
-      __ Add(array_size, element_count, FixedArray::kHeaderSize / kPointerSize);
-      __ Allocate(array_size, new_array, x11, x12, &undo_allocation,
-                  static_cast<AllocationFlags>(RESULT_CONTAINS_TOP |
-                                               SIZE_IN_WORDS));
-
-      Register array_map = x10;
-      __ LoadRoot(array_map, Heap::kFixedArrayMapRootIndex);
-      __ Str(array_map, MemOperand(new_array, FixedArray::kMapOffset));
-      __ SmiTag(x0, element_count);
-      __ Str(x0, MemOperand(new_array, FixedArray::kLengthOffset));
-
-      // Initialize the fields to undefined.
-      Register elements = x10;
-      __ Add(elements, new_array, FixedArray::kHeaderSize);
-      __ FillFields(elements, element_count, undef);
-
-      // Store the initialized FixedArray into the properties field of the
-      // JSObject.
-      __ Add(new_array, new_array, kHeapObjectTag);
-      __ Str(new_array, FieldMemOperand(new_obj, JSObject::kPropertiesOffset));
-
-      // Continue with JSObject being successfully allocated.
-      __ B(&allocated);
-
-      // Undo the setting of the new top so that the heap is verifiable. For
-      // example, the map's unused properties potentially do not match the
-      // allocated objects unused properties.
-      __ Bind(&undo_allocation);
-      __ UndoAllocationInNewSpace(new_obj, x14);
-    }
-
-    // Allocate the new receiver object using the runtime call.
-    __ Bind(&rt_call);
-    Label count_incremented;
-    if (create_memento) {
-      // Get the cell or allocation site.
-      __ Peek(x4, 2 * kXRegSize);
-      __ Push(x4);
-      __ Push(constructor);  // Argument for Runtime_NewObject.
-      __ CallRuntime(Runtime::kNewObjectWithAllocationSite, 2);
-      __ Mov(x4, x0);
-      // If we ended up using the runtime, and we want a memento, then the
-      // runtime call made it for us, and we shouldn't do create count
-      // increment.
-      __ jmp(&count_incremented);
-    } else {
-      __ Push(constructor);  // Argument for Runtime_NewObject.
-      __ CallRuntime(Runtime::kNewObject, 1);
-      __ Mov(x4, x0);
-    }
-
-    // Receiver for constructor call allocated.
-    // x4: JSObject
-    __ Bind(&allocated);
-
-    if (create_memento) {
-      __ Peek(x10, 2 * kXRegSize);
-      __ JumpIfRoot(x10, Heap::kUndefinedValueRootIndex, &count_incremented);
-      // r2 is an AllocationSite. We are creating a memento from it, so we
-      // need to increment the memento create count.
-      __ Ldr(x5, FieldMemOperand(x10,
-                                 AllocationSite::kPretenureCreateCountOffset));
-      __ Add(x5, x5, Operand(Smi::FromInt(1)));
-      __ Str(x5, FieldMemOperand(x10,
-                                 AllocationSite::kPretenureCreateCountOffset));
-      __ bind(&count_incremented);
-    }
-
-    __ Push(x4, x4);
-
-    // Reload the number of arguments from the stack.
-    // Set it up in x0 for the function call below.
-    // jssp[0]: receiver
-    // jssp[1]: receiver
-    // jssp[2]: constructor function
-    // jssp[3]: number of arguments (smi-tagged)
-    __ Peek(constructor, 2 * kXRegSize);  // Load constructor.
-    __ Peek(argc, 3 * kXRegSize);  // Load number of arguments.
-    __ SmiUntag(argc);
-
-    // Set up pointer to last argument.
-    __ Add(x2, fp, StandardFrameConstants::kCallerSPOffset);
-
-    // Copy arguments and receiver to the expression stack.
-    // Copy 2 values every loop to use ldp/stp.
-    // x0: number of arguments
-    // x1: constructor function
-    // x2: address of last argument (caller sp)
-    // jssp[0]: receiver
-    // jssp[1]: receiver
-    // jssp[2]: constructor function
-    // jssp[3]: number of arguments (smi-tagged)
-    // Compute the start address of the copy in x3.
-    __ Add(x3, x2, Operand(argc, LSL, kPointerSizeLog2));
-    Label loop, entry, done_copying_arguments;
-    __ B(&entry);
-    __ Bind(&loop);
-    __ Ldp(x10, x11, MemOperand(x3, -2 * kPointerSize, PreIndex));
-    __ Push(x11, x10);
-    __ Bind(&entry);
-    __ Cmp(x3, x2);
-    __ B(gt, &loop);
-    // Because we copied values 2 by 2 we may have copied one extra value.
-    // Drop it if that is the case.
-    __ B(eq, &done_copying_arguments);
-    __ Drop(1);
-    __ Bind(&done_copying_arguments);
-
-    // Call the function.
-    // x0: number of arguments
-    // x1: constructor function
-    if (is_api_function) {
-      __ Ldr(cp, FieldMemOperand(constructor, JSFunction::kContextOffset));
-      Handle<Code> code =
-          masm->isolate()->builtins()->HandleApiCallConstruct();
-      __ Call(code, RelocInfo::CODE_TARGET);
-    } else {
-      ParameterCount actual(argc);
-      __ InvokeFunction(constructor, actual, CALL_FUNCTION, NullCallWrapper());
-    }
-
-    // Store offset of return address for deoptimizer.
-    if (!is_api_function && !count_constructions) {
-      masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());
-    }
-
-    // Restore the context from the frame.
-    // x0: result
-    // jssp[0]: receiver
-    // jssp[1]: constructor function
-    // jssp[2]: number of arguments (smi-tagged)
-    __ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
-
-    // If the result is an object (in the ECMA sense), we should get rid
-    // of the receiver and use the result; see ECMA-262 section 13.2.2-7
-    // on page 74.
-    Label use_receiver, exit;
-
-    // If the result is a smi, it is *not* an object in the ECMA sense.
-    // x0: result
-    // jssp[0]: receiver (newly allocated object)
-    // jssp[1]: constructor function
-    // jssp[2]: number of arguments (smi-tagged)
-    __ JumpIfSmi(x0, &use_receiver);
-
-    // If the type of the result (stored in its map) is less than
-    // FIRST_SPEC_OBJECT_TYPE, it is not an object in the ECMA sense.
-    __ JumpIfObjectType(x0, x1, x3, FIRST_SPEC_OBJECT_TYPE, &exit, ge);
-
-    // Throw away the result of the constructor invocation and use the
-    // on-stack receiver as the result.
-    __ Bind(&use_receiver);
-    __ Peek(x0, 0);
-
-    // Remove the receiver from the stack, remove caller arguments, and
-    // return.
-    __ Bind(&exit);
-    // x0: result
-    // jssp[0]: receiver (newly allocated object)
-    // jssp[1]: constructor function
-    // jssp[2]: number of arguments (smi-tagged)
-    __ Peek(x1, 2 * kXRegSize);
-
-    // Leave construct frame.
-  }
-
-  __ DropBySMI(x1);
-  __ Drop(1);
-  __ IncrementCounter(isolate->counters()->constructed_objects(), 1, x1, x2);
-  __ Ret();
-}
-
-
-void Builtins::Generate_JSConstructStubCountdown(MacroAssembler* masm) {
-  Generate_JSConstructStubHelper(masm, false, true, false);
-}
-
-
-void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
-  Generate_JSConstructStubHelper(masm, false, false, FLAG_pretenuring_call_new);
-}
-
-
-void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
-  Generate_JSConstructStubHelper(masm, true, false, false);
-}
-
-
-// Input:
-//   x0: code entry.
-//   x1: function.
-//   x2: receiver.
-//   x3: argc.
-//   x4: argv.
-// Output:
-//   x0: result.
-static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
-                                             bool is_construct) {
-  // Called from JSEntryStub::GenerateBody().
-  Register function = x1;
-  Register receiver = x2;
-  Register argc = x3;
-  Register argv = x4;
-
-  ProfileEntryHookStub::MaybeCallEntryHook(masm);
-
-  // Clear the context before we push it when entering the internal frame.
-  __ Mov(cp, 0);
-
-  {
-    // Enter an internal frame.
-    FrameScope scope(masm, StackFrame::INTERNAL);
-
-    // Set up the context from the function argument.
-    __ Ldr(cp, FieldMemOperand(function, JSFunction::kContextOffset));
-
-    __ InitializeRootRegister();
-
-    // Push the function and the receiver onto the stack.
-    __ Push(function, receiver);
-
-    // Copy arguments to the stack in a loop, in reverse order.
-    // x3: argc.
-    // x4: argv.
-    Label loop, entry;
-    // Compute the copy end address.
-    __ Add(x10, argv, Operand(argc, LSL, kPointerSizeLog2));
-
-    __ B(&entry);
-    __ Bind(&loop);
-    __ Ldr(x11, MemOperand(argv, kPointerSize, PostIndex));
-    __ Ldr(x12, MemOperand(x11));  // Dereference the handle.
-    __ Push(x12);  // Push the argument.
-    __ Bind(&entry);
-    __ Cmp(x10, argv);
-    __ B(ne, &loop);
-
-    // Initialize all JavaScript callee-saved registers, since they will be seen
-    // by the garbage collector as part of handlers.
-    // The original values have been saved in JSEntryStub::GenerateBody().
-    __ LoadRoot(x19, Heap::kUndefinedValueRootIndex);
-    __ Mov(x20, x19);
-    __ Mov(x21, x19);
-    __ Mov(x22, x19);
-    __ Mov(x23, x19);
-    __ Mov(x24, x19);
-    __ Mov(x25, x19);
-    // Don't initialize the reserved registers.
-    // x26 : root register (root).
-    // x27 : context pointer (cp).
-    // x28 : JS stack pointer (jssp).
-    // x29 : frame pointer (fp).
-
-    __ Mov(x0, argc);
-    if (is_construct) {
-      // No type feedback cell is available.
-      __ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
-
-      CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);
-      __ CallStub(&stub);
-    } else {
-      ParameterCount actual(x0);
-      __ InvokeFunction(function, actual, CALL_FUNCTION, NullCallWrapper());
-    }
-    // Exit the JS internal frame and remove the parameters (except function),
-    // and return.
-  }
-
-  // Result is in x0. Return.
-  __ Ret();
-}
-
-
-void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
-  Generate_JSEntryTrampolineHelper(masm, false);
-}
-
-
-void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
-  Generate_JSEntryTrampolineHelper(masm, true);
-}
-
-
-void Builtins::Generate_CompileUnoptimized(MacroAssembler* masm) {
-  CallRuntimePassFunction(masm, Runtime::kCompileUnoptimized);
-  GenerateTailCallToReturnedCode(masm);
-}
-
-
-static void CallCompileOptimized(MacroAssembler* masm, bool concurrent) {
-  FrameScope scope(masm, StackFrame::INTERNAL);
-  Register function = x1;
-
-  // Preserve function. At the same time, push arguments for
-  // kCompileOptimized.
-  __ LoadObject(x10, masm->isolate()->factory()->ToBoolean(concurrent));
-  __ Push(function, function, x10);
-
-  __ CallRuntime(Runtime::kCompileOptimized, 2);
-
-  // Restore receiver.
-  __ Pop(function);
-}
-
-
-void Builtins::Generate_CompileOptimized(MacroAssembler* masm) {
-  CallCompileOptimized(masm, false);
-  GenerateTailCallToReturnedCode(masm);
-}
-
-
-void Builtins::Generate_CompileOptimizedConcurrent(MacroAssembler* masm) {
-  CallCompileOptimized(masm, true);
-  GenerateTailCallToReturnedCode(masm);
-}
-
-
-static void GenerateMakeCodeYoungAgainCommon(MacroAssembler* masm) {
-  // For now, we are relying on the fact that make_code_young doesn't do any
-  // garbage collection which allows us to save/restore the registers without
-  // worrying about which of them contain pointers. We also don't build an
-  // internal frame to make the code fast, since we shouldn't have to do stack
-  // crawls in MakeCodeYoung. This seems a bit fragile.
-
-  // The following caller-saved registers must be saved and restored when
-  // calling through to the runtime:
-  //   x0 - The address from which to resume execution.
-  //   x1 - isolate
-  //   lr - The return address for the JSFunction itself. It has not yet been
-  //        preserved on the stack because the frame setup code was replaced
-  //        with a call to this stub, to handle code ageing.
-  {
-    FrameScope scope(masm, StackFrame::MANUAL);
-    __ Push(x0, x1, fp, lr);
-    __ Mov(x1, ExternalReference::isolate_address(masm->isolate()));
-    __ CallCFunction(
-        ExternalReference::get_make_code_young_function(masm->isolate()), 2);
-    __ Pop(lr, fp, x1, x0);
-  }
-
-  // The calling function has been made young again, so return to execute the
-  // real frame set-up code.
-  __ Br(x0);
-}
-
-#define DEFINE_CODE_AGE_BUILTIN_GENERATOR(C)                 \
-void Builtins::Generate_Make##C##CodeYoungAgainEvenMarking(  \
-    MacroAssembler* masm) {                                  \
-  GenerateMakeCodeYoungAgainCommon(masm);                    \
-}                                                            \
-void Builtins::Generate_Make##C##CodeYoungAgainOddMarking(   \
-    MacroAssembler* masm) {                                  \
-  GenerateMakeCodeYoungAgainCommon(masm);                    \
-}
-CODE_AGE_LIST(DEFINE_CODE_AGE_BUILTIN_GENERATOR)
-#undef DEFINE_CODE_AGE_BUILTIN_GENERATOR
-
-
-void Builtins::Generate_MarkCodeAsExecutedOnce(MacroAssembler* masm) {
-  // For now, as in GenerateMakeCodeYoungAgainCommon, we are relying on the fact
-  // that make_code_young doesn't do any garbage collection which allows us to
-  // save/restore the registers without worrying about which of them contain
-  // pointers.
-
-  // The following caller-saved registers must be saved and restored when
-  // calling through to the runtime:
-  //   x0 - The address from which to resume execution.
-  //   x1 - isolate
-  //   lr - The return address for the JSFunction itself. It has not yet been
-  //        preserved on the stack because the frame setup code was replaced
-  //        with a call to this stub, to handle code ageing.
-  {
-    FrameScope scope(masm, StackFrame::MANUAL);
-    __ Push(x0, x1, fp, lr);
-    __ Mov(x1, ExternalReference::isolate_address(masm->isolate()));
-    __ CallCFunction(
-        ExternalReference::get_mark_code_as_executed_function(
-            masm->isolate()), 2);
-    __ Pop(lr, fp, x1, x0);
-
-    // Perform prologue operations usually performed by the young code stub.
-    __ EmitFrameSetupForCodeAgePatching(masm);
-  }
-
-  // Jump to point after the code-age stub.
-  __ Add(x0, x0, kCodeAgeSequenceSize);
-  __ Br(x0);
-}
-
-
-void Builtins::Generate_MarkCodeAsExecutedTwice(MacroAssembler* masm) {
-  GenerateMakeCodeYoungAgainCommon(masm);
-}
-
-
-static void Generate_NotifyStubFailureHelper(MacroAssembler* masm,
-                                             SaveFPRegsMode save_doubles) {
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-
-    // Preserve registers across notification, this is important for compiled
-    // stubs that tail call the runtime on deopts passing their parameters in
-    // registers.
-    // TODO(jbramley): Is it correct (and appropriate) to use safepoint
-    // registers here? According to the comment above, we should only need to
-    // preserve the registers with parameters.
-    __ PushXRegList(kSafepointSavedRegisters);
-    // Pass the function and deoptimization type to the runtime system.
-    __ CallRuntime(Runtime::kNotifyStubFailure, 0, save_doubles);
-    __ PopXRegList(kSafepointSavedRegisters);
-  }
-
-  // Ignore state (pushed by Deoptimizer::EntryGenerator::Generate).
-  __ Drop(1);
-
-  // Jump to the miss handler. Deoptimizer::EntryGenerator::Generate loads this
-  // into lr before it jumps here.
-  __ Br(lr);
-}
-
-
-void Builtins::Generate_NotifyStubFailure(MacroAssembler* masm) {
-  Generate_NotifyStubFailureHelper(masm, kDontSaveFPRegs);
-}
-
-
-void Builtins::Generate_NotifyStubFailureSaveDoubles(MacroAssembler* masm) {
-  Generate_NotifyStubFailureHelper(masm, kSaveFPRegs);
-}
-
-
-static void Generate_NotifyDeoptimizedHelper(MacroAssembler* masm,
-                                             Deoptimizer::BailoutType type) {
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    // Pass the deoptimization type to the runtime system.
-    __ Mov(x0, Smi::FromInt(static_cast<int>(type)));
-    __ Push(x0);
-    __ CallRuntime(Runtime::kNotifyDeoptimized, 1);
-  }
-
-  // Get the full codegen state from the stack and untag it.
-  Register state = x6;
-  __ Peek(state, 0);
-  __ SmiUntag(state);
-
-  // Switch on the state.
-  Label with_tos_register, unknown_state;
-  __ CompareAndBranch(
-      state, FullCodeGenerator::NO_REGISTERS, ne, &with_tos_register);
-  __ Drop(1);  // Remove state.
-  __ Ret();
-
-  __ Bind(&with_tos_register);
-  // Reload TOS register.
-  __ Peek(x0, kPointerSize);
-  __ CompareAndBranch(state, FullCodeGenerator::TOS_REG, ne, &unknown_state);
-  __ Drop(2);  // Remove state and TOS.
-  __ Ret();
-
-  __ Bind(&unknown_state);
-  __ Abort(kInvalidFullCodegenState);
-}
-
-
-void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
-  Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
-}
-
-
-void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
-  Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
-}
-
-
-void Builtins::Generate_NotifySoftDeoptimized(MacroAssembler* masm) {
-  Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::SOFT);
-}
-
-
-void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
-  // Lookup the function in the JavaScript frame.
-  __ Ldr(x0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    // Pass function as argument.
-    __ Push(x0);
-    __ CallRuntime(Runtime::kCompileForOnStackReplacement, 1);
-  }
-
-  // If the code object is null, just return to the unoptimized code.
-  Label skip;
-  __ CompareAndBranch(x0, Smi::FromInt(0), ne, &skip);
-  __ Ret();
-
-  __ Bind(&skip);
-
-  // Load deoptimization data from the code object.
-  // <deopt_data> = <code>[#deoptimization_data_offset]
-  __ Ldr(x1, MemOperand(x0, Code::kDeoptimizationDataOffset - kHeapObjectTag));
-
-  // Load the OSR entrypoint offset from the deoptimization data.
-  // <osr_offset> = <deopt_data>[#header_size + #osr_pc_offset]
-  __ Ldrsw(w1, UntagSmiFieldMemOperand(x1, FixedArray::OffsetOfElementAt(
-      DeoptimizationInputData::kOsrPcOffsetIndex)));
-
-  // Compute the target address = code_obj + header_size + osr_offset
-  // <entry_addr> = <code_obj> + #header_size + <osr_offset>
-  __ Add(x0, x0, x1);
-  __ Add(lr, x0, Code::kHeaderSize - kHeapObjectTag);
-
-  // And "return" to the OSR entry point of the function.
-  __ Ret();
-}
-
-
-void Builtins::Generate_OsrAfterStackCheck(MacroAssembler* masm) {
-  // We check the stack limit as indicator that recompilation might be done.
-  Label ok;
-  __ CompareRoot(jssp, Heap::kStackLimitRootIndex);
-  __ B(hs, &ok);
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-    __ CallRuntime(Runtime::kStackGuard, 0);
-  }
-  __ Jump(masm->isolate()->builtins()->OnStackReplacement(),
-          RelocInfo::CODE_TARGET);
-
-  __ Bind(&ok);
-  __ Ret();
-}
-
-
-void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
-  enum {
-    call_type_JS_func = 0,
-    call_type_func_proxy = 1,
-    call_type_non_func = 2
-  };
-  Register argc = x0;
-  Register function = x1;
-  Register call_type = x4;
-  Register scratch1 = x10;
-  Register scratch2 = x11;
-  Register receiver_type = x13;
-
-  ASM_LOCATION("Builtins::Generate_FunctionCall");
-  // 1. Make sure we have at least one argument.
-  { Label done;
-    __ Cbnz(argc, &done);
-    __ LoadRoot(scratch1, Heap::kUndefinedValueRootIndex);
-    __ Push(scratch1);
-    __ Mov(argc, 1);
-    __ Bind(&done);
-  }
-
-  // 2. Get the function to call (passed as receiver) from the stack, check
-  //    if it is a function.
-  Label slow, non_function;
-  __ Peek(function, Operand(argc, LSL, kXRegSizeLog2));
-  __ JumpIfSmi(function, &non_function);
-  __ JumpIfNotObjectType(function, scratch1, receiver_type,
-                         JS_FUNCTION_TYPE, &slow);
-
-  // 3a. Patch the first argument if necessary when calling a function.
-  Label shift_arguments;
-  __ Mov(call_type, static_cast<int>(call_type_JS_func));
-  { Label convert_to_object, use_global_receiver, patch_receiver;
-    // Change context eagerly in case we need the global receiver.
-    __ Ldr(cp, FieldMemOperand(function, JSFunction::kContextOffset));
-
-    // Do not transform the receiver for strict mode functions.
-    // Also do not transform the receiver for native (Compilerhints already in
-    // x3).
-    __ Ldr(scratch1,
-           FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
-    __ Ldr(scratch2.W(),
-           FieldMemOperand(scratch1, SharedFunctionInfo::kCompilerHintsOffset));
-    __ TestAndBranchIfAnySet(
-        scratch2.W(),
-        (1 << SharedFunctionInfo::kStrictModeFunction) |
-        (1 << SharedFunctionInfo::kNative),
-        &shift_arguments);
-
-    // Compute the receiver in sloppy mode.
-    Register receiver = x2;
-    __ Sub(scratch1, argc, 1);
-    __ Peek(receiver, Operand(scratch1, LSL, kXRegSizeLog2));
-    __ JumpIfSmi(receiver, &convert_to_object);
-
-    __ JumpIfRoot(receiver, Heap::kUndefinedValueRootIndex,
-                  &use_global_receiver);
-    __ JumpIfRoot(receiver, Heap::kNullValueRootIndex, &use_global_receiver);
-
-    STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
-    __ JumpIfObjectType(receiver, scratch1, scratch2,
-                        FIRST_SPEC_OBJECT_TYPE, &shift_arguments, ge);
-
-    __ Bind(&convert_to_object);
-
-    {
-      // Enter an internal frame in order to preserve argument count.
-      FrameScope scope(masm, StackFrame::INTERNAL);
-      __ SmiTag(argc);
-
-      __ Push(argc, receiver);
-      __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
-      __ Mov(receiver, x0);
-
-      __ Pop(argc);
-      __ SmiUntag(argc);
-
-      // Exit the internal frame.
-    }
-
-    // Restore the function and flag in the registers.
-    __ Peek(function, Operand(argc, LSL, kXRegSizeLog2));
-    __ Mov(call_type, static_cast<int>(call_type_JS_func));
-    __ B(&patch_receiver);
-
-    __ Bind(&use_global_receiver);
-    __ Ldr(receiver, GlobalObjectMemOperand());
-    __ Ldr(receiver,
-           FieldMemOperand(receiver, GlobalObject::kGlobalReceiverOffset));
-
-
-    __ Bind(&patch_receiver);
-    __ Sub(scratch1, argc, 1);
-    __ Poke(receiver, Operand(scratch1, LSL, kXRegSizeLog2));
-
-    __ B(&shift_arguments);
-  }
-
-  // 3b. Check for function proxy.
-  __ Bind(&slow);
-  __ Mov(call_type, static_cast<int>(call_type_func_proxy));
-  __ Cmp(receiver_type, JS_FUNCTION_PROXY_TYPE);
-  __ B(eq, &shift_arguments);
-  __ Bind(&non_function);
-  __ Mov(call_type, static_cast<int>(call_type_non_func));
-
-  // 3c. Patch the first argument when calling a non-function.  The
-  //     CALL_NON_FUNCTION builtin expects the non-function callee as
-  //     receiver, so overwrite the first argument which will ultimately
-  //     become the receiver.
-  // call type (0: JS function, 1: function proxy, 2: non-function)
-  __ Sub(scratch1, argc, 1);
-  __ Poke(function, Operand(scratch1, LSL, kXRegSizeLog2));
-
-  // 4. Shift arguments and return address one slot down on the stack
-  //    (overwriting the original receiver).  Adjust argument count to make
-  //    the original first argument the new receiver.
-  // call type (0: JS function, 1: function proxy, 2: non-function)
-  __ Bind(&shift_arguments);
-  { Label loop;
-    // Calculate the copy start address (destination). Copy end address is jssp.
-    __ Add(scratch2, jssp, Operand(argc, LSL, kPointerSizeLog2));
-    __ Sub(scratch1, scratch2, kPointerSize);
-
-    __ Bind(&loop);
-    __ Ldr(x12, MemOperand(scratch1, -kPointerSize, PostIndex));
-    __ Str(x12, MemOperand(scratch2, -kPointerSize, PostIndex));
-    __ Cmp(scratch1, jssp);
-    __ B(ge, &loop);
-    // Adjust the actual number of arguments and remove the top element
-    // (which is a copy of the last argument).
-    __ Sub(argc, argc, 1);
-    __ Drop(1);
-  }
-
-  // 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin,
-  //     or a function proxy via CALL_FUNCTION_PROXY.
-  // call type (0: JS function, 1: function proxy, 2: non-function)
-  { Label js_function, non_proxy;
-    __ Cbz(call_type, &js_function);
-    // Expected number of arguments is 0 for CALL_NON_FUNCTION.
-    __ Mov(x2, 0);
-    __ Cmp(call_type, static_cast<int>(call_type_func_proxy));
-    __ B(ne, &non_proxy);
-
-    __ Push(function);  // Re-add proxy object as additional argument.
-    __ Add(argc, argc, 1);
-    __ GetBuiltinFunction(function, Builtins::CALL_FUNCTION_PROXY);
-    __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
-            RelocInfo::CODE_TARGET);
-
-    __ Bind(&non_proxy);
-    __ GetBuiltinFunction(function, Builtins::CALL_NON_FUNCTION);
-    __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
-            RelocInfo::CODE_TARGET);
-    __ Bind(&js_function);
-  }
-
-  // 5b. Get the code to call from the function and check that the number of
-  //     expected arguments matches what we're providing.  If so, jump
-  //     (tail-call) to the code in register edx without checking arguments.
-  __ Ldr(x3, FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
-  __ Ldrsw(x2,
-           FieldMemOperand(x3,
-             SharedFunctionInfo::kFormalParameterCountOffset));
-  Label dont_adapt_args;
-  __ Cmp(x2, argc);  // Check formal and actual parameter counts.
-  __ B(eq, &dont_adapt_args);
-  __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
-          RelocInfo::CODE_TARGET);
-  __ Bind(&dont_adapt_args);
-
-  __ Ldr(x3, FieldMemOperand(function, JSFunction::kCodeEntryOffset));
-  ParameterCount expected(0);
-  __ InvokeCode(x3, expected, expected, JUMP_FUNCTION, NullCallWrapper());
-}
-
-
-void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
-  ASM_LOCATION("Builtins::Generate_FunctionApply");
-  const int kIndexOffset    =
-      StandardFrameConstants::kExpressionsOffset - (2 * kPointerSize);
-  const int kLimitOffset    =
-      StandardFrameConstants::kExpressionsOffset - (1 * kPointerSize);
-  const int kArgsOffset     =  2 * kPointerSize;
-  const int kReceiverOffset =  3 * kPointerSize;
-  const int kFunctionOffset =  4 * kPointerSize;
-
-  {
-    FrameScope frame_scope(masm, StackFrame::INTERNAL);
-
-    Register args = x12;
-    Register receiver = x14;
-    Register function = x15;
-
-    // Get the length of the arguments via a builtin call.
-    __ Ldr(function, MemOperand(fp, kFunctionOffset));
-    __ Ldr(args, MemOperand(fp, kArgsOffset));
-    __ Push(function, args);
-    __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
-    Register argc = x0;
-
-    // Check the stack for overflow.
-    // We are not trying to catch interruptions (e.g. debug break and
-    // preemption) here, so the "real stack limit" is checked.
-    Label enough_stack_space;
-    __ LoadRoot(x10, Heap::kRealStackLimitRootIndex);
-    __ Ldr(function, MemOperand(fp, kFunctionOffset));
-    // Make x10 the space we have left. The stack might already be overflowed
-    // here which will cause x10 to become negative.
-    // TODO(jbramley): Check that the stack usage here is safe.
-    __ Sub(x10, jssp, x10);
-    // Check if the arguments will overflow the stack.
-    __ Cmp(x10, Operand(argc, LSR, kSmiShift - kPointerSizeLog2));
-    __ B(gt, &enough_stack_space);
-    // There is not enough stack space, so use a builtin to throw an appropriate
-    // error.
-    __ Push(function, argc);
-    __ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION);
-    // We should never return from the APPLY_OVERFLOW builtin.
-    if (__ emit_debug_code()) {
-      __ Unreachable();
-    }
-
-    __ Bind(&enough_stack_space);
-    // Push current limit and index.
-    __ Mov(x1, 0);  // Initial index.
-    __ Push(argc, x1);
-
-    Label push_receiver;
-    __ Ldr(receiver, MemOperand(fp, kReceiverOffset));
-
-    // Check that the function is a JS function. Otherwise it must be a proxy.
-    // When it is not the function proxy will be invoked later.
-    __ JumpIfNotObjectType(function, x10, x11, JS_FUNCTION_TYPE,
-                           &push_receiver);
-
-    // Change context eagerly to get the right global object if necessary.
-    __ Ldr(cp, FieldMemOperand(function, JSFunction::kContextOffset));
-    // Load the shared function info.
-    __ Ldr(x2, FieldMemOperand(function,
-                               JSFunction::kSharedFunctionInfoOffset));
-
-    // Compute and push the receiver.
-    // Do not transform the receiver for strict mode functions.
-    Label convert_receiver_to_object, use_global_receiver;
-    __ Ldr(w10, FieldMemOperand(x2, SharedFunctionInfo::kCompilerHintsOffset));
-    __ Tbnz(x10, SharedFunctionInfo::kStrictModeFunction, &push_receiver);
-    // Do not transform the receiver for native functions.
-    __ Tbnz(x10, SharedFunctionInfo::kNative, &push_receiver);
-
-    // Compute the receiver in sloppy mode.
-    __ JumpIfSmi(receiver, &convert_receiver_to_object);
-    __ JumpIfRoot(receiver, Heap::kNullValueRootIndex, &use_global_receiver);
-    __ JumpIfRoot(receiver, Heap::kUndefinedValueRootIndex,
-                  &use_global_receiver);
-
-    // Check if the receiver is already a JavaScript object.
-    STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
-    __ JumpIfObjectType(receiver, x10, x11, FIRST_SPEC_OBJECT_TYPE,
-                        &push_receiver, ge);
-
-    // Call a builtin to convert the receiver to a regular object.
-    __ Bind(&convert_receiver_to_object);
-    __ Push(receiver);
-    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
-    __ Mov(receiver, x0);
-    __ B(&push_receiver);
-
-    __ Bind(&use_global_receiver);
-    __ Ldr(x10, GlobalObjectMemOperand());
-    __ Ldr(receiver, FieldMemOperand(x10, GlobalObject::kGlobalReceiverOffset));
-
-    // Push the receiver
-    __ Bind(&push_receiver);
-    __ Push(receiver);
-
-    // Copy all arguments from the array to the stack.
-    Label entry, loop;
-    Register current = x0;
-    __ Ldr(current, MemOperand(fp, kIndexOffset));
-    __ B(&entry);
-
-    __ Bind(&loop);
-    // Load the current argument from the arguments array and push it.
-    // TODO(all): Couldn't we optimize this for JS arrays?
-
-    __ Ldr(x1, MemOperand(fp, kArgsOffset));
-    __ Push(x1, current);
-
-    // Call the runtime to access the property in the arguments array.
-    __ CallRuntime(Runtime::kGetProperty, 2);
-    __ Push(x0);
-
-    // Use inline caching to access the arguments.
-    __ Ldr(current, MemOperand(fp, kIndexOffset));
-    __ Add(current, current, Smi::FromInt(1));
-    __ Str(current, MemOperand(fp, kIndexOffset));
-
-    // Test if the copy loop has finished copying all the elements from the
-    // arguments object.
-    __ Bind(&entry);
-    __ Ldr(x1, MemOperand(fp, kLimitOffset));
-    __ Cmp(current, x1);
-    __ B(ne, &loop);
-
-    // At the end of the loop, the number of arguments is stored in 'current',
-    // represented as a smi.
-
-    function = x1;  // From now on we want the function to be kept in x1;
-    __ Ldr(function, MemOperand(fp, kFunctionOffset));
-
-    // Call the function.
-    Label call_proxy;
-    ParameterCount actual(current);
-    __ SmiUntag(current);
-    __ JumpIfNotObjectType(function, x10, x11, JS_FUNCTION_TYPE, &call_proxy);
-    __ InvokeFunction(function, actual, CALL_FUNCTION, NullCallWrapper());
-    frame_scope.GenerateLeaveFrame();
-    __ Drop(3);
-    __ Ret();
-
-    // Call the function proxy.
-    __ Bind(&call_proxy);
-    // x0 : argc
-    // x1 : function
-    __ Push(function);  // Add function proxy as last argument.
-    __ Add(x0, x0, 1);
-    __ Mov(x2, 0);
-    __ GetBuiltinFunction(x1, Builtins::CALL_FUNCTION_PROXY);
-    __ Call(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
-            RelocInfo::CODE_TARGET);
-  }
-  __ Drop(3);
-  __ Ret();
-}
-
-
-static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
-  __ SmiTag(x10, x0);
-  __ Mov(x11, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
-  __ Push(lr, fp);
-  __ Push(x11, x1, x10);
-  __ Add(fp, jssp,
-         StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize);
-}
-
-
-static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
-  // ----------- S t a t e -------------
-  //  -- x0 : result being passed through
-  // -----------------------------------
-  // Get the number of arguments passed (as a smi), tear down the frame and
-  // then drop the parameters and the receiver.
-  __ Ldr(x10, MemOperand(fp, -(StandardFrameConstants::kFixedFrameSizeFromFp +
-                               kPointerSize)));
-  __ Mov(jssp, fp);
-  __ Pop(fp, lr);
-  __ DropBySMI(x10, kXRegSize);
-  __ Drop(1);
-}
-
-
-void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
-  ASM_LOCATION("Builtins::Generate_ArgumentsAdaptorTrampoline");
-  // ----------- S t a t e -------------
-  //  -- x0 : actual number of arguments
-  //  -- x1 : function (passed through to callee)
-  //  -- x2 : expected number of arguments
-  // -----------------------------------
-
-  Register argc_actual = x0;  // Excluding the receiver.
-  Register argc_expected = x2;  // Excluding the receiver.
-  Register function = x1;
-  Register code_entry = x3;
-
-  Label invoke, dont_adapt_arguments;
-
-  Label enough, too_few;
-  __ Ldr(code_entry, FieldMemOperand(function, JSFunction::kCodeEntryOffset));
-  __ Cmp(argc_actual, argc_expected);
-  __ B(lt, &too_few);
-  __ Cmp(argc_expected, SharedFunctionInfo::kDontAdaptArgumentsSentinel);
-  __ B(eq, &dont_adapt_arguments);
-
-  {  // Enough parameters: actual >= expected
-    EnterArgumentsAdaptorFrame(masm);
-
-    Register copy_start = x10;
-    Register copy_end = x11;
-    Register copy_to = x12;
-    Register scratch1 = x13, scratch2 = x14;
-
-    __ Lsl(argc_expected, argc_expected, kPointerSizeLog2);
-
-    // Adjust for fp, lr, and the receiver.
-    __ Add(copy_start, fp, 3 * kPointerSize);
-    __ Add(copy_start, copy_start, Operand(argc_actual, LSL, kPointerSizeLog2));
-    __ Sub(copy_end, copy_start, argc_expected);
-    __ Sub(copy_end, copy_end, kPointerSize);
-    __ Mov(copy_to, jssp);
-
-    // Claim space for the arguments, the receiver, and one extra slot.
-    // The extra slot ensures we do not write under jssp. It will be popped
-    // later.
-    __ Add(scratch1, argc_expected, 2 * kPointerSize);
-    __ Claim(scratch1, 1);
-
-    // Copy the arguments (including the receiver) to the new stack frame.
-    Label copy_2_by_2;
-    __ Bind(&copy_2_by_2);
-    __ Ldp(scratch1, scratch2,
-           MemOperand(copy_start, - 2 * kPointerSize, PreIndex));
-    __ Stp(scratch1, scratch2,
-           MemOperand(copy_to, - 2 * kPointerSize, PreIndex));
-    __ Cmp(copy_start, copy_end);
-    __ B(hi, &copy_2_by_2);
-
-    // Correct the space allocated for the extra slot.
-    __ Drop(1);
-
-    __ B(&invoke);
-  }
-
-  {  // Too few parameters: Actual < expected
-    __ Bind(&too_few);
-    EnterArgumentsAdaptorFrame(masm);
-
-    Register copy_from = x10;
-    Register copy_end = x11;
-    Register copy_to = x12;
-    Register scratch1 = x13, scratch2 = x14;
-
-    __ Lsl(argc_expected, argc_expected, kPointerSizeLog2);
-    __ Lsl(argc_actual, argc_actual, kPointerSizeLog2);
-
-    // Adjust for fp, lr, and the receiver.
-    __ Add(copy_from, fp, 3 * kPointerSize);
-    __ Add(copy_from, copy_from, argc_actual);
-    __ Mov(copy_to, jssp);
-    __ Sub(copy_end, copy_to, 1 * kPointerSize);   // Adjust for the receiver.
-    __ Sub(copy_end, copy_end, argc_actual);
-
-    // Claim space for the arguments, the receiver, and one extra slot.
-    // The extra slot ensures we do not write under jssp. It will be popped
-    // later.
-    __ Add(scratch1, argc_expected, 2 * kPointerSize);
-    __ Claim(scratch1, 1);
-
-    // Copy the arguments (including the receiver) to the new stack frame.
-    Label copy_2_by_2;
-    __ Bind(&copy_2_by_2);
-    __ Ldp(scratch1, scratch2,
-           MemOperand(copy_from, - 2 * kPointerSize, PreIndex));
-    __ Stp(scratch1, scratch2,
-           MemOperand(copy_to, - 2 * kPointerSize, PreIndex));
-    __ Cmp(copy_to, copy_end);
-    __ B(hi, &copy_2_by_2);
-
-    __ Mov(copy_to, copy_end);
-
-    // Fill the remaining expected arguments with undefined.
-    __ LoadRoot(scratch1, Heap::kUndefinedValueRootIndex);
-    __ Add(copy_end, jssp, kPointerSize);
-
-    Label fill;
-    __ Bind(&fill);
-    __ Stp(scratch1, scratch1,
-           MemOperand(copy_to, - 2 * kPointerSize, PreIndex));
-    __ Cmp(copy_to, copy_end);
-    __ B(hi, &fill);
-
-    // Correct the space allocated for the extra slot.
-    __ Drop(1);
-  }
-
-  // Arguments have been adapted. Now call the entry point.
-  __ Bind(&invoke);
-  __ Call(code_entry);
-
-  // Store offset of return address for deoptimizer.
-  masm->isolate()->heap()->SetArgumentsAdaptorDeoptPCOffset(masm->pc_offset());
-
-  // Exit frame and return.
-  LeaveArgumentsAdaptorFrame(masm);
-  __ Ret();
-
-  // Call the entry point without adapting the arguments.
-  __ Bind(&dont_adapt_arguments);
-  __ Jump(code_entry);
-}
-
-
-#undef __
-
-} }  // namespace v8::internal
-
-#endif  // V8_TARGET_ARCH_ARM