[WIP] Initial CallFunctionCallback builtin.

src/builtins/x64/builtins-x64.cc

Index: src/builtins/x64/builtins-x64.cc
diff --git a/src/builtins/x64/builtins-x64.cc b/src/builtins/x64/builtins-x64.cc
index 076cc8596cebf54b9b70be50beaab330660bf122..493036c0af726a86845a64b3ccb0a124a34ac96b 100644
--- a/src/builtins/x64/builtins-x64.cc
+++ b/src/builtins/x64/builtins-x64.cc
@@ -4,6 +4,7 @@
 
 #if V8_TARGET_ARCH_X64
 
+#include "src/api-arguments.h"
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/counters.h"
@@ -2936,6 +2937,139 @@ void Builtins::Generate_CallWithSpread(MacroAssembler* masm) {
 }
 
 // static
+void Builtins::Generate_CallFunctionCallback(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax                : the number of arguments (not incl. the receiver)
+  //  -- rdx                : api function address
+  //  -- rsp[0]             : return address
+  //  -- rsp[8]             : holder
+  //  -- rsp[16]            : isolate
+  //  -- rsp[24]            : return value default
+  //  -- rsp[32]            : return value
+  //  -- rsp[40]            : call data
+  //  -- rsp[48]            : target
+  //  -- rsp[56]            : context save
+  //  -- rsp[64]            : new.target
+  //  -- rsp[72]            : last argument
+  //  -- rsp[64 + argc * 8] : first argument
+  //  -- rsp[72 + argc * 8] : receiver
+  // -----------------------------------
+  typedef FunctionCallbackArguments FCA;
+
+  STATIC_ASSERT(FCA::kNewTargetIndex == 7);
+  STATIC_ASSERT(FCA::kContextSaveIndex == 6);
+  STATIC_ASSERT(FCA::kCalleeIndex == 5);
+  STATIC_ASSERT(FCA::kDataIndex == 4);
+  STATIC_ASSERT(FCA::kReturnValueOffset == 3);
+  STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
+  STATIC_ASSERT(FCA::kIsolateIndex == 1);
+  STATIC_ASSERT(FCA::kHolderIndex == 0);
+  STATIC_ASSERT(FCA::kArgsLength == 8);
+
+  // Compute the pointer to the implicit args on the stack.
+  __ leap(rbx, MemOperand(rsp, kPCOnStackSize));
+
+  // Allocate the v8::FunctionCallbackInfo structure in the arguments' space
+  // since it's not controlled by the GC.
+  const int kApiStackSpace = 3;
+  __ EnterApiExitFrame(kApiStackSpace);
+  // Initialize FunctionCallbackInfo::implicit_args_.
+  __ movp(StackSpaceOperand(0), rbx);
+  // Initialize FunctionCallbackInfo::values_.
+  __ leap(rbx, MemOperand(rbx, rax, times_pointer_size,
+                          (FCA::kArgsLength - 1) * kPointerSize));
+  __ movp(StackSpaceOperand(1), rbx);
+  // Initialize FunctionCallbackInfo::length_.
+  __ movp(StackSpaceOperand(2), rax);
+
+  // Load first argument with pointer to FunctionCallbackInfo.
+  __ leap(arg_reg_1, StackSpaceOperand(0));
+
+  const int kNextOffset = 0;
+  const int kLimitOffset = AddressOffset(
+      ExternalReference::handle_scope_limit_address(masm->isolate()),
+      ExternalReference::handle_scope_next_address(masm->isolate()));
+  const int kLevelOffset = AddressOffset(
+      ExternalReference::handle_scope_level_address(masm->isolate()),
+      ExternalReference::handle_scope_next_address(masm->isolate()));
+
+  // Allocate HandleScope in callee-save registers.
+  Register const prev_next_address_reg = r14;
+  Register const prev_limit_reg = rbx;
+  Register const base_reg = r15;
+  __ Move(base_reg,
+          ExternalReference::handle_scope_next_address(masm->isolate()));
+  __ movp(prev_next_address_reg, Operand(base_reg, kNextOffset));
+  __ movp(prev_limit_reg, Operand(base_reg, kLimitOffset));
+  __ addl(Operand(base_reg, kLevelOffset), Immediate(1));
+
+  // Check if profiling is active, and if so call the function indirectly
+  // via the invoke_function_callback helper.
+  Label call_indirect, done_call;
+  __ Move(rax, ExternalReference::is_profiling_address(masm->isolate()));
+  __ cmpb(MemOperand(rax, 0), Immediate(0));
+  __ j(not_zero, &call_indirect, Label::kNear);
+  {
+    // Call the API function directly.
+    __ call(rdx);
+  }
+  __ jmp(&done_call, Label::kNear);
+  __ bind(&call_indirect);
+  {
+    // Call the API function indirectly when profiling is on.
+    __ Move(arg_reg_2, rdx);
+    __ Call(ExternalReference::invoke_function_callback(masm->isolate()));
+  }
+  __ bind(&done_call);
+
+  // No more valid handles (the result handle was the last one). Restore
+  // previous handle scope.
+  Label delete_allocated_handles;
+  __ subl(Operand(base_reg, kLevelOffset), Immediate(1));
+  __ movp(Operand(base_reg, kNextOffset), prev_next_address_reg);
+  __ cmpp(prev_limit_reg, Operand(base_reg, kLimitOffset));
+  __ j(not_equal, &delete_allocated_handles);
+
+  // Leave the API exit frame.
+  Label leave_exit_frame;
+  __ bind(&leave_exit_frame);
+  __ movp(rax, MemOperand(rbp, (2 + FCA::kReturnValueOffset) * kPointerSize));
+  __ movp(rsi, MemOperand(rbp, (2 + FCA::kContextSaveIndex) * kPointerSize));
+  __ movp(rbx, StackSpaceOperand(2));
+  __ LeaveApiExitFrame(false);
+
+  // Check if the function scheduled an exception.
+  Label promote_scheduled_exception;
+  __ Move(rdi, ExternalReference::scheduled_exception_address(masm->isolate()));
+  __ JumpIfNotRoot(MemOperand(rdi, 0), Heap::kTheHoleValueRootIndex,
+                   &promote_scheduled_exception);
+
+  // Check if the function returned a valid JavaScript value.
+  __ AssertApiCallResult(rax);
+
+  // Drop the arguments and return.
+  __ PopReturnAddressTo(rcx);
+  __ leaq(rsp, MemOperand(rsp, rbx, times_pointer_size,
+                          (FCA::kArgsLength + 1) * kPointerSize));
+  __ PushReturnAddressFrom(rcx);
+  __ Ret();
+
+  // Re-throw by promoting a scheduled exception.
+  __ bind(&promote_scheduled_exception);
+  __ TailCallRuntime(Runtime::kPromoteScheduledException);
+
+  // HandleScope limit has changed. Delete allocated extensions.
+  __ bind(&delete_allocated_handles);
+  {
+    __ movp(Operand(base_reg, kLimitOffset), prev_limit_reg);
+    __ LoadAddress(arg_reg_1,
+                   ExternalReference::isolate_address(masm->isolate()));
+    __ Call(ExternalReference::delete_handle_scope_extensions(masm->isolate()));
+  }
+  __ jmp(&leave_exit_frame);
+}
+
+// static
 void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rax : the number of arguments (not including the receiver)