[fullcodegen] Remove deprecated generator implementation.

src/builtins/x87/builtins-x87.cc

Index: src/builtins/x87/builtins-x87.cc
diff --git a/src/builtins/x87/builtins-x87.cc b/src/builtins/x87/builtins-x87.cc
index a0d2650cf4f8485fd0430dc0f4b5c0f43e0ffd65..e766023c67cf90690b936e57cc1b7dc80ce6d6f2 100644
--- a/src/builtins/x87/builtins-x87.cc
+++ b/src/builtins/x87/builtins-x87.cc
@@ -438,14 +438,15 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
     __ bind(&done_loop);
   }
 
-  // Dispatch on the kind of generator object.
-  Label old_generator;
-  __ mov(ecx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
-  __ mov(ecx, FieldOperand(ecx, SharedFunctionInfo::kFunctionDataOffset));
-  __ CmpObjectType(ecx, BYTECODE_ARRAY_TYPE, ecx);
-  __ j(not_equal, &old_generator);
+  // Underlying function needs to have bytecode available.
+  if (FLAG_debug_code) {
+    __ mov(ecx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
+    __ mov(ecx, FieldOperand(ecx, SharedFunctionInfo::kFunctionDataOffset));
+    __ CmpObjectType(ecx, BYTECODE_ARRAY_TYPE, ecx);
+    __ Assert(equal, kMissingBytecodeArray);
+  }
 
-  // New-style (ignition/turbofan) generator object
+  // Resume (Ignition/TurboFan) generator object.
   {
     __ PushReturnAddressFrom(eax);
     __ mov(eax, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
@@ -458,49 +459,6 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
     __ jmp(FieldOperand(edi, JSFunction::kCodeEntryOffset));
   }
 
-  // Old-style (full-codegen) generator object
-  __ bind(&old_generator);
-  {
-    // Enter a new JavaScript frame, and initialize its slots as they were when
-    // the generator was suspended.
-    FrameScope scope(masm, StackFrame::MANUAL);
-    __ PushReturnAddressFrom(eax);  // Return address.
-    __ Push(ebp);                   // Caller's frame pointer.
-    __ Move(ebp, esp);
-    __ Push(esi);  // Callee's context.
-    __ Push(edi);  // Callee's JS Function.
-
-    // Restore the operand stack.
-    __ mov(eax, FieldOperand(ebx, JSGeneratorObject::kOperandStackOffset));
-    {
-      Label done_loop, loop;
-      __ Move(ecx, Smi::kZero);
-      __ bind(&loop);
-      __ cmp(ecx, FieldOperand(eax, FixedArray::kLengthOffset));
-      __ j(equal, &done_loop, Label::kNear);
-      __ Push(FieldOperand(eax, ecx, times_half_pointer_size,
-                           FixedArray::kHeaderSize));
-      __ add(ecx, Immediate(Smi::FromInt(1)));
-      __ jmp(&loop);
-      __ bind(&done_loop);
-    }
-
-    // Reset operand stack so we don't leak.
-    __ mov(FieldOperand(ebx, JSGeneratorObject::kOperandStackOffset),
-           Immediate(masm->isolate()->factory()->empty_fixed_array()));
-
-    // Resume the generator function at the continuation.
-    __ mov(edx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
-    __ mov(edx, FieldOperand(edx, SharedFunctionInfo::kCodeOffset));
-    __ mov(ecx, FieldOperand(ebx, JSGeneratorObject::kContinuationOffset));
-    __ SmiUntag(ecx);
-    __ lea(edx, FieldOperand(edx, ecx, times_1, Code::kHeaderSize));
-    __ mov(FieldOperand(ebx, JSGeneratorObject::kContinuationOffset),
-           Immediate(Smi::FromInt(JSGeneratorObject::kGeneratorExecuting)));
-    __ mov(eax, ebx);  // Continuation expects generator object in eax.
-    __ jmp(edx);
-  }
-
   __ bind(&prepare_step_in_if_stepping);
   {
     FrameScope scope(masm, StackFrame::INTERNAL);