[generators] Remove full-codegen implementation of yield*.

src/full-codegen/x64/full-codegen-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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 1897 matching lines @@
     }
 
     case Yield::kFinal: {
       // Pop value from top-of-stack slot, box result into result register.
       EmitCreateIteratorResult(true);
       EmitUnwindBeforeReturn();
       EmitReturnSequence();
       break;
     }
 
-    case Yield::kDelegating: {
-      VisitForStackValue(expr->generator_object());
-
-      // Initial stack layout is as follows:
-      // [sp + 1 * kPointerSize] iter
-      // [sp + 0 * kPointerSize] g
-
-      Label l_catch, l_try, l_suspend, l_continuation, l_resume;
-      Label l_next, l_call, l_loop;
-      Register load_receiver = LoadDescriptor::ReceiverRegister();
-      Register load_name = LoadDescriptor::NameRegister();
-
-      // Initial send value is undefined.
-      __ LoadRoot(rax, Heap::kUndefinedValueRootIndex);
-      __ jmp(&l_next);
-
-      // catch (e) { receiver = iter; f = 'throw'; arg = e; goto l_call; }
-      __ bind(&l_catch);
-      __ LoadRoot(load_name, Heap::kthrow_stringRootIndex);  // "throw"
-      __ Push(load_name);
-      __ Push(Operand(rsp, 2 * kPointerSize));               // iter
-      __ Push(rax);                                          // exception
-      __ jmp(&l_call);
-
-      // try { received = %yield result }
-      // Shuffle the received result above a try handler and yield it without
-      // re-boxing.
-      __ bind(&l_try);
-      __ Pop(rax);                                       // result
-      int handler_index = NewHandlerTableEntry();
-      EnterTryBlock(handler_index, &l_catch);
-      const int try_block_size = TryCatch::kElementCount * kPointerSize;
-      __ Push(rax);                                      // result
-
-      __ jmp(&l_suspend);
-      __ bind(&l_continuation);
-      __ RecordGeneratorContinuation();
-      __ jmp(&l_resume);
-
-      __ bind(&l_suspend);
-      const int generator_object_depth = kPointerSize + try_block_size;
-      __ movp(rax, Operand(rsp, generator_object_depth));
-      __ Push(rax);                                      // g
-      __ Push(Smi::FromInt(handler_index));              // handler-index
-      DCHECK(l_continuation.pos() > 0 && Smi::IsValid(l_continuation.pos()));
-      __ Move(FieldOperand(rax, JSGeneratorObject::kContinuationOffset),
-              Smi::FromInt(l_continuation.pos()));
-      __ movp(FieldOperand(rax, JSGeneratorObject::kContextOffset), rsi);
-      __ movp(rcx, rsi);
-      __ RecordWriteField(rax, JSGeneratorObject::kContextOffset, rcx, rdx,
-                          kDontSaveFPRegs);
-      __ CallRuntime(Runtime::kSuspendJSGeneratorObject, 2);
-      __ movp(context_register(),
-              Operand(rbp, StandardFrameConstants::kContextOffset));
-      __ Pop(rax);                                       // result
-      EmitReturnSequence();
-      __ bind(&l_resume);                                // received in rax
-      ExitTryBlock(handler_index);
-
-      // receiver = iter; f = 'next'; arg = received;
-      __ bind(&l_next);
-
-      __ LoadRoot(load_name, Heap::knext_stringRootIndex);
-      __ Push(load_name);                           // "next"
-      __ Push(Operand(rsp, 2 * kPointerSize));      // iter
-      __ Push(rax);                                 // received
-
-      // result = receiver[f](arg);
-      __ bind(&l_call);
-      __ movp(load_receiver, Operand(rsp, kPointerSize));
-      __ Move(LoadDescriptor::SlotRegister(),
-              SmiFromSlot(expr->KeyedLoadFeedbackSlot()));
-      Handle<Code> ic = CodeFactory::KeyedLoadIC(isolate(), SLOPPY).code();
-      CallIC(ic, TypeFeedbackId::None());
-      __ movp(rdi, rax);
-      __ movp(Operand(rsp, 2 * kPointerSize), rdi);
-
-      SetCallPosition(expr);
-      __ Set(rax, 1);
-      __ Call(
-          isolate()->builtins()->Call(ConvertReceiverMode::kNotNullOrUndefined),
-          RelocInfo::CODE_TARGET);
-
-      __ movp(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
-      __ Drop(1);  // The function is still on the stack; drop it.
-
-      // if (!result.done) goto l_try;
-      __ bind(&l_loop);
-      __ Move(load_receiver, rax);
-      __ Push(load_receiver);                               // save result
-      __ LoadRoot(load_name, Heap::kdone_stringRootIndex);  // "done"
-      __ Move(LoadDescriptor::SlotRegister(),
-              SmiFromSlot(expr->DoneFeedbackSlot()));
-      CallLoadIC(NOT_INSIDE_TYPEOF);  // rax=result.done
-      Handle<Code> bool_ic = ToBooleanStub::GetUninitialized(isolate());
-      CallIC(bool_ic);
-      __ CompareRoot(result_register(), Heap::kTrueValueRootIndex);
-      __ j(not_equal, &l_try);
-
-      // result.value
-      __ Pop(load_receiver);                             // result
-      __ LoadRoot(load_name, Heap::kvalue_stringRootIndex);  // "value"
-      __ Move(LoadDescriptor::SlotRegister(),
-              SmiFromSlot(expr->ValueFeedbackSlot()));
-      CallLoadIC(NOT_INSIDE_TYPEOF);                     // result.value in rax
-      context()->DropAndPlug(2, rax);                    // drop iter and g
-      break;
-    }
+    case Yield::kDelegating:
+      UNREACHABLE();
   }
 }
 
 
 void FullCodeGenerator::EmitGeneratorResume(
     Expression* generator, Expression* value,
     JSGeneratorObject::ResumeMode resume_mode) {
   // The value stays in rax, and is ultimately read by the resumed generator, as
   // if CallRuntime(Runtime::kSuspendJSGeneratorObject) returned it. Or it
   // is read to throw the value when the resumed generator is already closed.
@@ skipping 2688 matching lines @@
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64