Adapt hydrogen-based Array constructor to also support InternalArray and function call

src/x64/builtins-x64.cc

 // Copyright 2012 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
@@ skipping 1459 matching lines @@
     // Will both indicate a NULL and a Smi.
     STATIC_ASSERT(kSmiTag == 0);
     Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
     __ Check(not_smi, "Unexpected initial map for InternalArray function");
     __ CmpObjectType(rbx, MAP_TYPE, rcx);
     __ Check(equal, "Unexpected initial map for InternalArray function");
   }
 
   // Run the native code for the InternalArray function called as a normal
   // function.
-  ArrayNativeCode(masm, &generic_array_code);
+  if (FLAG_optimize_constructed_arrays) {
+    // tail call a stub
+    InternalArrayConstructorStub stub(masm->isolate());
+    __ TailCallStub(&stub);
+  } else {
+    ArrayNativeCode(masm, &generic_array_code);
 
-  // Jump to the generic array code in case the specialized code cannot handle
-  // the construction.
-  __ bind(&generic_array_code);
-  Handle<Code> array_code =
-      masm->isolate()->builtins()->InternalArrayCodeGeneric();
-  __ Jump(array_code, RelocInfo::CODE_TARGET);
+    // Jump to the generic array code in case the specialized code cannot handle
+    // the construction.
+    __ bind(&generic_array_code);
+    Handle<Code> array_code =
+        masm->isolate()->builtins()->InternalArrayCodeGeneric();
+    __ Jump(array_code, RelocInfo::CODE_TARGET);
+  }
 }
 
 
 void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rax : argc
   //  -- rsp[0] : return address
   //  -- rsp[8] : last argument
   // -----------------------------------
   Label generic_array_code;
 
   // Get the Array function.
   __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, rdi);
 
   if (FLAG_debug_code) {
     // Initial map for the builtin Array functions should be maps.
     __ movq(rbx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
     // Will both indicate a NULL and a Smi.
     STATIC_ASSERT(kSmiTag == 0);
     Condition not_smi = NegateCondition(masm->CheckSmi(rbx));
     __ Check(not_smi, "Unexpected initial map for Array function");
     __ CmpObjectType(rbx, MAP_TYPE, rcx);
     __ Check(equal, "Unexpected initial map for Array function");
   }
 
   // Run the native code for the Array function called as a normal function.
-  ArrayNativeCode(masm, &generic_array_code);
+  if (FLAG_optimize_constructed_arrays) {
+    // tail call a stub
+    Handle<Object> undefined_sentinel(
+        masm->isolate()->heap()->undefined_value(),
+        masm->isolate());
+    __ Move(rbx, undefined_sentinel);
+    ArrayConstructorStub stub(masm->isolate());
+    __ TailCallStub(&stub);
+  } else {
+    ArrayNativeCode(masm, &generic_array_code);
 
-  // Jump to the generic array code in case the specialized code cannot handle
-  // the construction.
-  __ bind(&generic_array_code);
-  Handle<Code> array_code =
-      masm->isolate()->builtins()->ArrayCodeGeneric();
-  __ Jump(array_code, RelocInfo::CODE_TARGET);
+    // Jump to the generic array code in case the specialized code cannot handle
+    // the construction.
+    __ bind(&generic_array_code);
+    Handle<Code> array_code =
+        masm->isolate()->builtins()->ArrayCodeGeneric();
+    __ Jump(array_code, RelocInfo::CODE_TARGET);
+  }
 }
 
 
 void Builtins::Generate_CommonArrayConstructCode(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rax : argc
   //  -- rdi : constructor
   //  -- rsp[0] : return address
   //  -- rsp[8] : last argument
   // -----------------------------------
@@ skipping 300 matching lines @@
   Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR);
   generator.Generate();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64