Implement subclassing Arrays.

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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 4988 matching lines @@
     CreateArrayDispatch<ArrayNArgumentsConstructorStub>(masm, mode);
   } else {
     UNREACHABLE();
   }
 }
 
 
 void ArrayConstructorStub::Generate(MacroAssembler* masm) {
   ASM_LOCATION("ArrayConstructorStub::Generate");
   // ----------- S t a t e -------------
-  //  -- x0 : argc (only if argument_count() == ANY)
+  //  -- x0 : argc (only if argument_count() is ANY or MORE_THAN_ONE)
   //  -- x1 : constructor
   //  -- x2 : AllocationSite or undefined
   //  -- x3 : original constructor
-  //  -- sp[0] : return address
-  //  -- sp[4] : last argument
+  //  -- sp[0] : last argument
   // -----------------------------------
   Register constructor = x1;
   Register allocation_site = x2;
   Register original_constructor = x3;
 
   if (FLAG_debug_code) {
     // The array construct code is only set for the global and natives
     // builtin Array functions which always have maps.
 
     Label unexpected_map, map_ok;
@@ skipping 23 matching lines @@
 
   __ Ldrsw(kind,
            UntagSmiFieldMemOperand(allocation_site,
                                    AllocationSite::kTransitionInfoOffset));
   __ And(kind, kind, AllocationSite::ElementsKindBits::kMask);
   GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
 
   __ Bind(&no_info);
   GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
 
+  // Subclassing support.
   __ Bind(&subclassing);
-  __ TailCallRuntime(Runtime::kThrowArrayNotSubclassableError, 0, 1);
+  __ Push(constructor, original_constructor);
+  // Adjust argc.
+  switch (argument_count()) {
+    case ANY:
+    case MORE_THAN_ONE:
+      __ add(x0, x0, Operand(2));
+      break;
+    case NONE:
+      __ Mov(x0, Operand(2));
+      break;
+    case ONE:
+      __ Mov(x0, Operand(3));
+      break;
+  }
+  __ JumpToExternalReference(
+      ExternalReference(Runtime::kArrayConstructorWithSubclassing, isolate()));
 }
 
 
 void InternalArrayConstructorStub::GenerateCase(
     MacroAssembler* masm, ElementsKind kind) {
   Label zero_case, n_case;
   Register argc = x0;
 
   __ Cbz(argc, &zero_case);
   __ CompareAndBranch(argc, 1, ne, &n_case);
@@ skipping 423 matching lines @@
                            kStackUnwindSpace, NULL, spill_offset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64