[fullcodegen] Remove deprecated generator implementation.

src/builtins/arm/builtins-arm.cc

Index: src/builtins/arm/builtins-arm.cc
diff --git a/src/builtins/arm/builtins-arm.cc b/src/builtins/arm/builtins-arm.cc
index 610397178724bac176e0c15a84392d83e28d6416..b1b41f974d89f0a382e5d324225491a25498ef1e 100644
--- a/src/builtins/arm/builtins-arm.cc
+++ b/src/builtins/arm/builtins-arm.cc
@@ -790,14 +790,15 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
     __ bind(&done_loop);
   }
 
-  // Dispatch on the kind of generator object.
-  Label old_generator;
-  __ ldr(r3, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
-  __ ldr(r3, FieldMemOperand(r3, SharedFunctionInfo::kFunctionDataOffset));
-  __ CompareObjectType(r3, r3, r3, BYTECODE_ARRAY_TYPE);
-  __ b(ne, &old_generator);
+  // Underlying function needs to have bytecode available.
+  if (FLAG_debug_code) {
+    __ ldr(r3, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
+    __ ldr(r3, FieldMemOperand(r3, SharedFunctionInfo::kFunctionDataOffset));
+    __ CompareObjectType(r3, r3, r3, BYTECODE_ARRAY_TYPE);
+    __ Assert(eq, kMissingBytecodeArray);
+  }
 
-  // New-style (ignition/turbofan) generator object
+  // Resume (Ignition/TurboFan) generator object.
   {
     __ ldr(r0, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
     __ ldr(r0, FieldMemOperand(
@@ -812,49 +813,6 @@ void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
     __ Jump(r5);
   }
 
-  // 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.
-    DCHECK(!FLAG_enable_embedded_constant_pool);
-    FrameScope scope(masm, StackFrame::MANUAL);
-    __ Push(lr, fp);
-    __ Move(fp, sp);
-    __ Push(cp, r4);
-
-    // Restore the operand stack.
-    __ ldr(r0, FieldMemOperand(r1, JSGeneratorObject::kOperandStackOffset));
-    __ ldr(r3, FieldMemOperand(r0, FixedArray::kLengthOffset));
-    __ add(r0, r0, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
-    __ add(r3, r0, Operand(r3, LSL, kPointerSizeLog2 - 1));
-    {
-      Label done_loop, loop;
-      __ bind(&loop);
-      __ cmp(r0, r3);
-      __ b(eq, &done_loop);
-      __ ldr(ip, MemOperand(r0, kPointerSize, PostIndex));
-      __ Push(ip);
-      __ b(&loop);
-      __ bind(&done_loop);
-    }
-
-    // Reset operand stack so we don't leak.
-    __ LoadRoot(ip, Heap::kEmptyFixedArrayRootIndex);
-    __ str(ip, FieldMemOperand(r1, JSGeneratorObject::kOperandStackOffset));
-
-    // Resume the generator function at the continuation.
-    __ ldr(r3, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
-    __ ldr(r3, FieldMemOperand(r3, SharedFunctionInfo::kCodeOffset));
-    __ add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
-    __ ldr(r2, FieldMemOperand(r1, JSGeneratorObject::kContinuationOffset));
-    __ add(r3, r3, Operand(r2, ASR, 1));
-    __ mov(r2, Operand(Smi::FromInt(JSGeneratorObject::kGeneratorExecuting)));
-    __ str(r2, FieldMemOperand(r1, JSGeneratorObject::kContinuationOffset));
-    __ Move(r0, r1);  // Continuation expects generator object in r0.
-    __ Jump(r3);
-  }
-
   __ bind(&prepare_step_in_if_stepping);
   {
     FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);