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

src/interpreter/bytecode-array-builder.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/interpreter/bytecode-array-builder.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
@@ skipping 57 matching lines @@
 
   Handle<BytecodeArray> output =
       factory->NewBytecodeArray(bytecode_size, &bytecodes_.front(), frame_size,
                                 parameter_count_, constant_pool);
   bytecode_generated_ = true;
   return output;
 }
 
 
 template <size_t N>
-void BytecodeArrayBuilder::Output(uint8_t(&bytes)[N]) {
-  DCHECK_EQ(Bytecodes::NumberOfOperands(Bytecodes::FromByte(bytes[0])),
-            static_cast<int>(N) - 1);
+void BytecodeArrayBuilder::Output(Bytecode bytecode, uint32_t(&operands)[N]) {
+  DCHECK_EQ(Bytecodes::NumberOfOperands(bytecode), N);
   last_bytecode_start_ = bytecodes()->size();
-  for (int i = 1; i < static_cast<int>(N); i++) {
-    DCHECK(OperandIsValid(Bytecodes::FromByte(bytes[0]), i - 1, bytes[i]));
+  bytecodes()->push_back(Bytecodes::ToByte(bytecode));
+  for (int i = 0; i < static_cast<int>(N); i++) {
+    DCHECK(OperandIsValid(bytecode, i, operands[i]));
+    switch (Bytecodes::GetOperandSize(bytecode, i)) {
+      case OperandSize::kNone:
+        UNREACHABLE();
+      case OperandSize::kByte:
+        bytecodes()->push_back(static_cast<uint8_t>(operands[i]));
+        break;
+      case OperandSize::kShort: {
+        uint8_t operand_bytes[2];
+        Bytecodes::ShortOperandToBytes(operands[i], operand_bytes);
+        bytecodes()->insert(bytecodes()->end(), operand_bytes,
+                            operand_bytes + 2);
+        break;
+      }
+    }
   }
-  bytecodes()->insert(bytecodes()->end(), bytes, bytes + N);
 }
 
 
-void BytecodeArrayBuilder::Output(Bytecode bytecode, uint8_t operand0,
-                                  uint8_t operand1, uint8_t operand2) {
-  uint8_t bytes[] = {Bytecodes::ToByte(bytecode), operand0, operand1, operand2};
-  Output(bytes);
+void BytecodeArrayBuilder::Output(Bytecode bytecode, uint32_t operand0,
+                                  uint32_t operand1, uint32_t operand2) {
+  uint32_t operands[] = {operand0, operand1, operand2};
+  Output(bytecode, operands);
 }
 
 
-void BytecodeArrayBuilder::Output(Bytecode bytecode, uint8_t operand0,
-                                  uint8_t operand1) {
-  uint8_t bytes[] = {Bytecodes::ToByte(bytecode), operand0, operand1};
-  Output(bytes);
+void BytecodeArrayBuilder::Output(Bytecode bytecode, uint32_t operand0,
+                                  uint32_t operand1) {
+  uint32_t operands[] = {operand0, operand1};
+  Output(bytecode, operands);
 }
 
 
-void BytecodeArrayBuilder::Output(Bytecode bytecode, uint8_t operand0) {
-  uint8_t bytes[] = {Bytecodes::ToByte(bytecode), operand0};
-  Output(bytes);
+void BytecodeArrayBuilder::Output(Bytecode bytecode, uint32_t operand0) {
+  uint32_t operands[] = {operand0};
+  Output(bytecode, operands);
 }
 
 
 void BytecodeArrayBuilder::Output(Bytecode bytecode) {
-  uint8_t bytes[] = {Bytecodes::ToByte(bytecode)};
-  Output(bytes);
+  DCHECK_EQ(Bytecodes::NumberOfOperands(bytecode), 0);
+  last_bytecode_start_ = bytecodes()->size();
+  bytecodes()->push_back(Bytecodes::ToByte(bytecode));
 }
 
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::BinaryOperation(Token::Value op,
                                                             Register reg) {
   Output(BytecodeForBinaryOperation(op), reg.ToOperand());
   return *this;
 }
 
 
@@ skipping 165 matching lines @@
       case Bytecode::kTestEqual:
       case Bytecode::kTestNotEqual:
       case Bytecode::kTestEqualStrict:
       case Bytecode::kTestNotEqualStrict:
       case Bytecode::kTestLessThan:
       case Bytecode::kTestLessThanEqual:
       case Bytecode::kTestGreaterThan:
       case Bytecode::kTestGreaterThanEqual:
       case Bytecode::kTestInstanceOf:
       case Bytecode::kTestIn:
+        return *this;
+      default:
+        // Fall through to output kToBoolean.
         break;
-      default:
-        Output(Bytecode::kToBoolean);
     }
   }
+  Output(Bytecode::kToBoolean);
   return *this;
 }
 
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::Bind(BytecodeLabel* label) {
   if (label->is_forward_target()) {
     // An earlier jump instruction refers to this label. Update it's location.
     PatchJump(bytecodes()->end(), bytecodes()->begin() + label->offset());
     // Now treat as if the label will only be back referred to.
   }
@@ skipping 176 matching lines @@
 }
 
 
 void BytecodeArrayBuilder::ReturnTemporaryRegister(int reg_index) {
   DCHECK_EQ(reg_index, temporary_register_next_ - 1);
   temporary_register_next_ = reg_index;
 }
 
 
 bool BytecodeArrayBuilder::OperandIsValid(Bytecode bytecode, int operand_index,
-                                          uint8_t operand_value) const {
+                                          uint32_t operand_value) const {
   OperandType operand_type = Bytecodes::GetOperandType(bytecode, operand_index);
   switch (operand_type) {
     case OperandType::kNone:
       return false;
-    case OperandType::kCount:
+    case OperandType::kIdx16:
+      return static_cast<uint16_t>(operand_value) == operand_value;
+    case OperandType::kCount8:
     case OperandType::kImm8:
-    case OperandType::kIdx:
-      return true;
-    case OperandType::kReg: {
-      Register reg = Register::FromOperand(operand_value);
+    case OperandType::kIdx8:
+      return static_cast<uint8_t>(operand_value) == operand_value;
+    case OperandType::kReg8: {
+      Register reg = Register::FromOperand(static_cast<uint8_t>(operand_value));
       if (reg.is_parameter()) {
         int parameter_index = reg.ToParameterIndex(parameter_count_);
         return parameter_index >= 0 && parameter_index < parameter_count_;
       } else {
         return (reg.index() >= 0 && reg.index() < temporary_register_next_);
       }
     }
   }
   UNREACHABLE();
   return false;
@@ skipping 86 matching lines @@
 
 Register TemporaryRegisterScope::NewRegister() {
   count_++;
   last_register_index_ = builder_->BorrowTemporaryRegister();
   return Register(last_register_index_);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8