Throw a TypeError when calling "next" method of a newly created generator with a value

src/mips/full-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1999 matching lines @@
       __ jmp(&suspend);
 
       __ bind(&continuation);
       __ jmp(&resume);
 
       __ bind(&suspend);
       VisitForAccumulatorValue(expr->generator_object());
       ASSERT(continuation.pos() > 0 && Smi::IsValid(continuation.pos()));
       __ li(a1, Operand(Smi::FromInt(continuation.pos())));
       __ sw(a1, FieldMemOperand(v0, JSGeneratorObject::kContinuationOffset));
+      if (expr->yield_kind() == Yield::INITIAL) {
+        __ sw(a1,
+              FieldMemOperand(v0, JSGeneratorObject::kSuspendedStartOffset));
+      }
       __ sw(cp, FieldMemOperand(v0, JSGeneratorObject::kContextOffset));
       __ mov(a1, cp);
       __ RecordWriteField(v0, JSGeneratorObject::kContextOffset, a1, a2,
                           kRAHasBeenSaved, kDontSaveFPRegs);
       __ Addu(a1, fp, Operand(StandardFrameConstants::kExpressionsOffset));
       __ Branch(&post_runtime, eq, sp, Operand(a1));
       __ push(v0);  // generator object
       __ CallRuntime(Runtime::kSuspendJSGeneratorObject, 1);
       __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
       __ bind(&post_runtime);
@@ skipping 109 matching lines @@
     JSGeneratorObject::ResumeMode resume_mode) {
   // The value stays in a0, and is ultimately read by the resumed generator, as
   // if the CallRuntime(Runtime::kSuspendJSGeneratorObject) returned it. Or it
   // is read to throw the value when the resumed generator is already closed.
   // a1 will hold the generator object until the activation has been resumed.
   VisitForStackValue(generator);
   VisitForAccumulatorValue(value);
   __ pop(a1);
 
   // Check generator state.
-  Label wrong_state, closed_state, done;
+  Label wrong_state, closed_state, suspended_start_state, resume_state, done;
   __ lw(a3, FieldMemOperand(a1, JSGeneratorObject::kContinuationOffset));
   STATIC_ASSERT(JSGeneratorObject::kGeneratorExecuting < 0);
   STATIC_ASSERT(JSGeneratorObject::kGeneratorClosed == 0);
   __ Branch(&closed_state, eq, a3, Operand(zero_reg));
   __ Branch(&wrong_state, lt, a3, Operand(zero_reg));
+  __ lw(a2, FieldMemOperand(a1, JSGeneratorObject::kSuspendedStartOffset));
+  __ Branch(&suspended_start_state, eq, a3, Operand(a2));
+
+  __ bind(&resume_state);
 
   // Load suspended function and context.
   __ lw(cp, FieldMemOperand(a1, JSGeneratorObject::kContextOffset));
   __ lw(t0, FieldMemOperand(a1, JSGeneratorObject::kFunctionOffset));
 
   // Load receiver and store as the first argument.
   __ lw(a2, FieldMemOperand(a1, JSGeneratorObject::kReceiverOffset));
   __ push(a2);
 
   // Push holes for the rest of the arguments to the generator function.
@@ skipping 52 matching lines @@
   __ push(a2);
   __ Branch(&push_operand_holes);
   __ bind(&call_resume);
   ASSERT(!result_register().is(a1));
   __ Push(a1, result_register());
   __ Push(Smi::FromInt(resume_mode));
   __ CallRuntime(Runtime::kResumeJSGeneratorObject, 3);
   // Not reached: the runtime call returns elsewhere.
   __ stop("not-reached");
 
+  // Throw the provided value.
+  Label throw_provided_value;
+  __ bind(&throw_provided_value);
+  if (resume_mode != JSGeneratorObject::NEXT) {
+    __ push(a0);
+    __ CallRuntime(Runtime::kThrow, 1);
+    __ Branch(&done);
+  }
+
+  // Reach here when calling initial resume to a generator.
+  __ bind(&suspended_start_state);
+  if (resume_mode == JSGeneratorObject::NEXT) {
+    // When value is provided and it is not undefined, throw error.
+    __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
+    __ Branch(&resume_state, eq, a0, Operand(a2));
+    __ CallRuntime(Runtime::kThrowGeneratorStartError, 0);
+    __ Branch(&done);
+  } else {
+      // Make generator's state to "closed".
+      __ li(a2, Operand(Smi::FromInt(JSGeneratorObject::kGeneratorClosed)));
+      __ sw(a2, FieldMemOperand(a1, JSGeneratorObject::kContinuationOffset));
+    __ Branch(&throw_provided_value);
+  }
+
   // Reach here when generator is closed.
   __ bind(&closed_state);
   if (resume_mode == JSGeneratorObject::NEXT) {
     // Return completed iterator result when generator is closed.
     __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
     __ push(a2);
     // Pop value from top-of-stack slot; box result into result register.
     EmitCreateIteratorResult(true);
+    __ Branch(&done);
   } else {
-    // Throw the provided value.
-    __ push(a0);
-    __ CallRuntime(Runtime::kThrow, 1);
+    __ Branch(&throw_provided_value);
   }
-  __ jmp(&done);
 
   // Throw error if we attempt to operate on a running generator.
   __ bind(&wrong_state);
   __ push(a1);
   __ CallRuntime(Runtime::kThrowGeneratorStateError, 1);
 
   __ bind(&done);
   context()->Plug(result_register());
 }
 
@@ skipping 2713 matching lines @@
       Assembler::target_address_at(pc_immediate_load_address)) ==
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS