Optimized nodeType dom binding by removing HandleScope and the preparation of ordinary c function c…

src/x64/macro-assembler-x64.cc

 // Copyright 2012 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_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 842 matching lines @@
   movp(Operand(base_reg, kLimitOffset), prev_limit_reg);
   movp(prev_limit_reg, rax);
   LoadAddress(arg_reg_1, ExternalReference::isolate_address(isolate()));
   LoadAddress(rax,
               ExternalReference::delete_handle_scope_extensions(isolate()));
   call(rax);
   movp(rax, prev_limit_reg);
   jmp(&leave_exit_frame);
 }
 
+void MacroAssembler::CallFastApiFunctionAndReturn(
+    Register function_address,
+    ExternalReference thunk_ref,
+    Register thunk_last_arg,
+    int stack_space,
+    Operand return_value_operand,
+    Operand* context_restore_operand) {
+  Label prologue;
+  Label promote_scheduled_exception;
+  Label exception_handled;
+  Label delete_allocated_handles;
+  Label leave_exit_frame;
+  Label write_back;
+
+  Factory* factory = isolate()->factory();
+  /*
+  ExternalReference next_address =
+      ExternalReference::handle_scope_next_address(isolate());
+  const int kNextOffset = 0;
+  const int kLimitOffset = Offset(
+      ExternalReference::handle_scope_limit_address(isolate()),
+      next_address);
+  const int kLevelOffset = Offset(
+      ExternalReference::handle_scope_level_address(isolate()),
+      next_address);
+  */
+  ExternalReference scheduled_exception_address =
+      ExternalReference::scheduled_exception_address(isolate());
+
+  DCHECK(rdx.is(function_address) || r8.is(function_address));
+  // Allocate HandleScope in callee-save registers.
+  /*Register prev_next_address_reg = r14;
+  Register prev_limit_reg = rbx;
+  Register base_reg = r15;
+  */
+  Label profiler_disabled;
+  Move(rax, function_address);
+
+  // Call the api function!
+  call(rax);
+  // Load the value from ReturnValue
+  movp(rax, return_value_operand);
+  bind(&prologue);
+
+  bind(&leave_exit_frame);
+
+  // Check if the function scheduled an exception.
+  Move(rsi, scheduled_exception_address);
+  Cmp(Operand(rsi, 0), factory->the_hole_value());
+  j(not_equal, &promote_scheduled_exception);
+  bind(&exception_handled);
+
+  // LeaveApiExitFrame(!restore_context);
+  ExternalReference context_address(Isolate::kContextAddress, isolate());
+  Operand context_operand = ExternalOperand(context_address);
+  movp(rsi, context_operand);
+  movp(context_operand, Immediate(0));
+  ret(stack_space * kPointerSize);
+
+  bind(&promote_scheduled_exception);
+  {
+    FrameScope frame(this, StackFrame::INTERNAL);
+    CallRuntime(Runtime::kPromoteScheduledException, 0);
+  }
+  jmp(&exception_handled);
+
+  // HandleScope limit has changed. Delete allocated extensions.
+  /*
+  bind(&delete_allocated_handles);
+  movp(Operand(base_reg, kLimitOffset), prev_limit_reg);
+  movp(prev_limit_reg, rax);
+  LoadAddress(arg_reg_1, ExternalReference::isolate_address(isolate()));
+  LoadAddress(rax,
+              ExternalReference::delete_handle_scope_extensions(isolate()));
+  call(rax);
+  movp(rax, prev_limit_reg);
+  jmp(&leave_exit_frame);
+  */
+}
 
 void MacroAssembler::JumpToExternalReference(const ExternalReference& ext,
                                              int result_size) {
   // Set the entry point and jump to the C entry runtime stub.
   LoadAddress(rbx, ext);
   CEntryStub ces(isolate(), result_size);
   jmp(ces.GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
@@ skipping 4521 matching lines @@
   if (mag.shift > 0) sarl(rdx, Immediate(mag.shift));
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64