[WIP] Initial CallFunctionCallback builtin.

src/builtins/ia32/builtins-ia32.cc

Index: src/builtins/ia32/builtins-ia32.cc
diff --git a/src/builtins/ia32/builtins-ia32.cc b/src/builtins/ia32/builtins-ia32.cc
index c907fa8dfe9e941688f912f5bab84e3313ed24fb..9390e312492ff89e8132ab5046de949d9325fb6c 100644
--- a/src/builtins/ia32/builtins-ia32.cc
+++ b/src/builtins/ia32/builtins-ia32.cc
@@ -4,6 +4,7 @@
 
 #if V8_TARGET_ARCH_IA32
 
+#include "src/api-arguments.h"
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
@@ -2875,6 +2876,167 @@ void Builtins::Generate_CallWithSpread(MacroAssembler* masm) {
           RelocInfo::CODE_TARGET);
 }
 
+namespace {
+
+// Prepares stack to put arguments (aligns and so on). Reserves
+// space for return value if needed (assumes the return value is a handle).
+// Arguments must be stored in ApiParameterOperand(0), ApiParameterOperand(1)
+// etc. Saves context (esi). If space was reserved for return value then
+// stores the pointer to the reserved slot into esi.
+void PrepareCallApiFunction(MacroAssembler* masm, int argc) {
+  __ EnterApiExitFrame(argc);
+  if (__ emit_debug_code()) {
+    __ mov(esi, Immediate(bit_cast<int32_t>(kZapValue)));
+  }
+}
+
+// Generates an Operand for saving parameters after PrepareCallApiFunction.
+Operand ApiParameterOperand(int index) {
+  return MemOperand(esp, index * kPointerSize);
+}
+
+}  // namespace
+
+// static
+void Builtins::Generate_CallFunctionCallback(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- eax                : the number of arguments (not incl. the receiver)
+  //  -- edx                : api function address
+  //  -- esp[0]             : return address
+  //  -- esp[4]             : holder
+  //  -- esp[8]             : isolate
+  //  -- esp[12]            : return value default
+  //  -- esp[16]            : return value
+  //  -- esp[20]            : call data
+  //  -- esp[24]            : target
+  //  -- esp[28]            : context save
+  //  -- esp[32]            : new.target
+  //  -- esp[36]            : last argument
+  //  -- esp[32 + argc * 4] : first argument
+  //  -- esp[36 + argc * 4] : 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.
+  __ lea(ebx, MemOperand(esp, kPCOnStackSize));
+
+  // API function gets reference to the v8::Arguments. If CPU profiler
+  // is enabled wrapper function will be called and we need to pass
+  // address of the callback as additional parameter, always allocate
+  // space for it.
+  const int kApiArgc = 1 + 1;
+
+  // Allocate the v8::FunctionCallbackInfo structure in the arguments' space
+  // since it's not controlled by the GC.
+  const int kApiStackSpace = 3;
+  PrepareCallApiFunction(masm, kApiArgc + kApiStackSpace);
+  // Initialize FunctionCallbackInfo::implicit_args_.
+  __ mov(ApiParameterOperand(2), ebx);
+  // Initialize FunctionCallbackInfo::values_.
+  __ lea(ebx, MemOperand(ebx, eax, times_pointer_size,
+                         (FCA::kArgsLength - 1) * kPointerSize));
+  __ mov(ApiParameterOperand(3), ebx);
+  // Initialize FunctionCallbackInfo::length_.
+  __ mov(ApiParameterOperand(4), eax);
+
+  // Load first argument with pointer to FunctionCallbackInfo.
+  __ lea(ebx, ApiParameterOperand(2));
+  __ mov(ApiParameterOperand(0), ebx);
+
+  ExternalReference const next_address =
+      ExternalReference::handle_scope_next_address(masm->isolate());
+  ExternalReference const limit_address =
+      ExternalReference::handle_scope_limit_address(masm->isolate());
+  ExternalReference const level_address =
+      ExternalReference::handle_scope_level_address(masm->isolate());
+
+  // Allocate HandleScope in callee-save registers.
+  __ mov(ebx, Operand::StaticVariable(next_address));
+  __ mov(edi, Operand::StaticVariable(limit_address));
+  __ add(Operand::StaticVariable(level_address), 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;
+  __ cmpb(Operand::StaticVariable(
+              ExternalReference::is_profiling_address(masm->isolate())),
+          Immediate(0));
+  __ j(not_zero, &call_indirect, Label::kNear);
+  {
+    // Call the API function directly.
+    __ call(edx);
+  }
+  __ jmp(&done_call, Label::kNear);
+  __ bind(&call_indirect);
+  {
+    // Call the API function indirectly when profiling is on.
+    __ mov(ApiParameterOperand(1), edx);
+    __ mov(eax, Immediate(ExternalReference::invoke_function_callback(
+                    masm->isolate())));
+    __ call(eax);
+  }
+  __ bind(&done_call);
+
+  // No more valid handles (the result handle was the last one). Restore
+  // previous handle scope.
+  Label delete_allocated_handles;
+  __ mov(Operand::StaticVariable(next_address), ebx);
+  __ sub(Operand::StaticVariable(level_address), Immediate(1));
+  __ cmp(edi, Operand::StaticVariable(limit_address));
+  __ j(not_equal, &delete_allocated_handles);
+
+  // Leave the API exit frame.
+  Label leave_exit_frame;
+  __ bind(&leave_exit_frame);
+  __ mov(eax, MemOperand(ebp, (2 + FCA::kReturnValueOffset) * kPointerSize));
+  __ mov(esi, MemOperand(ebp, (2 + FCA::kContextSaveIndex) * kPointerSize));
+  __ mov(ebx, ApiParameterOperand(4));
+  __ LeaveApiExitFrame(false);
+
+  // Check if the function scheduled an exception.
+  Label promote_scheduled_exception;
+  __ cmp(Operand::StaticVariable(
+             ExternalReference::scheduled_exception_address(masm->isolate())),
+         Immediate(masm->isolate()->factory()->the_hole_value()));
+  __ j(not_equal, &promote_scheduled_exception);
+
+  // Check if the function returned a valid JavaScript value.
+  __ AssertApiCallResult(eax);
+
+  // Drop the arguments and return.
+  __ PopReturnAddressTo(ecx);
+  __ lea(esp, MemOperand(esp, ebx, times_pointer_size,
+                         (FCA::kArgsLength + 1) * kPointerSize));
+  __ PushReturnAddressFrom(ecx);
+  __ 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);
+  {
+    __ mov(Operand::StaticVariable(limit_address), edi);
+    __ mov(Operand(esp, 0),
+           Immediate(ExternalReference::isolate_address(masm->isolate())));
+    __ mov(eax, Immediate(ExternalReference::delete_handle_scope_extensions(
+                    masm->isolate())));
+    __ call(eax);
+  }
+  __ jmp(&leave_exit_frame);
+}
+
 // static
 void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
   // ----------- S t a t e -------------