[Interpreter] Add support for short (16 bit) operands.

test/unittests/interpreter/bytecode-array-iterator-unittest.cc

 // Copyright 2015 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.
 
 #include "src/v8.h"
 
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "test/unittests/test-utils.h"
 
@@ skipping 19 matching lines @@
   Handle<HeapObject> heap_num_0 = factory->NewHeapNumber(2.718);
   Handle<HeapObject> heap_num_1 = factory->NewHeapNumber(2147483647);
   Smi* zero = Smi::FromInt(0);
   Smi* smi_0 = Smi::FromInt(64);
   Smi* smi_1 = Smi::FromInt(-65536);
   Register reg_0(0);
   Register reg_1(1);
   Register reg_2 = Register::FromParameterIndex(2, builder.parameter_count());
   int feedback_slot = 97;
 
+  // TODO(rmcilroy): Add a test for a bytecode with a short operand when
+  // the CallRuntime bytecode is landed.
+
   builder.LoadLiteral(heap_num_0)
       .LoadLiteral(heap_num_1)
       .LoadLiteral(zero)
       .LoadLiteral(smi_0)
       .LoadLiteral(smi_1)
       .LoadAccumulatorWithRegister(reg_0)
       .LoadNamedProperty(reg_1, feedback_slot, LanguageMode::SLOPPY)
       .StoreAccumulatorInRegister(reg_2)
       .Return();
 
   // Test iterator sees the expected output from the builder.
   BytecodeArrayIterator iterator(builder.ToBytecodeArray());
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaConstant);
   CHECK(iterator.GetConstantForIndexOperand(0).is_identical_to(heap_num_0));
   CHECK(!iterator.done());
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaConstant);
   CHECK(iterator.GetConstantForIndexOperand(0).is_identical_to(heap_num_1));
   CHECK(!iterator.done());
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaZero);
   CHECK(!iterator.done());
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaSmi8);
-  CHECK_EQ(Smi::FromInt(iterator.GetSmi8Operand(0)), smi_0);
+  CHECK_EQ(Smi::FromInt(iterator.GetImmediateOperand(0)), smi_0);
   CHECK(!iterator.done());
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdaConstant);
   CHECK_EQ(*iterator.GetConstantForIndexOperand(0), smi_1);
   CHECK(!iterator.done());
   iterator.Advance();
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kLdar);
   CHECK_EQ(iterator.GetRegisterOperand(0).index(), reg_0.index());
@@ skipping 13 matching lines @@
 
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
   CHECK(!iterator.done());
   iterator.Advance();
   CHECK(iterator.done());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8