Reland "[interpreter] Reduce dependencies in bytecodes.{h,cc}"

src/interpreter/bytecode-register.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-register.h"
+
+namespace v8 {
+namespace internal {
+namespace interpreter {
+
+static const int kLastParamRegisterIndex =
+    (InterpreterFrameConstants::kRegisterFileFromFp -
+     InterpreterFrameConstants::kLastParamFromFp) /
+    kPointerSize;
+static const int kFunctionClosureRegisterIndex =
+    (InterpreterFrameConstants::kRegisterFileFromFp -
+     StandardFrameConstants::kFunctionOffset) /
+    kPointerSize;
+static const int kCurrentContextRegisterIndex =
+    (InterpreterFrameConstants::kRegisterFileFromFp -
+     StandardFrameConstants::kContextOffset) /
+    kPointerSize;
+static const int kNewTargetRegisterIndex =
+    (InterpreterFrameConstants::kRegisterFileFromFp -
+     InterpreterFrameConstants::kNewTargetFromFp) /
+    kPointerSize;
+static const int kBytecodeArrayRegisterIndex =
+    (InterpreterFrameConstants::kRegisterFileFromFp -
+     InterpreterFrameConstants::kBytecodeArrayFromFp) /
+    kPointerSize;
+static const int kBytecodeOffsetRegisterIndex =
+    (InterpreterFrameConstants::kRegisterFileFromFp -
+     InterpreterFrameConstants::kBytecodeOffsetFromFp) /
+    kPointerSize;
+static const int kCallerPCOffsetRegisterIndex =
+    (InterpreterFrameConstants::kRegisterFileFromFp -
+     InterpreterFrameConstants::kCallerPCOffsetFromFp) /
+    kPointerSize;
+
+Register Register::FromParameterIndex(int index, int parameter_count) {
+  DCHECK_GE(index, 0);
+  DCHECK_LT(index, parameter_count);
+  int register_index = kLastParamRegisterIndex - parameter_count + index + 1;
+  DCHECK_LT(register_index, 0);
+  return Register(register_index);
+}
+
+int Register::ToParameterIndex(int parameter_count) const {
+  DCHECK(is_parameter());
+  return index() - kLastParamRegisterIndex + parameter_count - 1;
+}
+
+Register Register::function_closure() {
+  return Register(kFunctionClosureRegisterIndex);
+}
+
+bool Register::is_function_closure() const {
+  return index() == kFunctionClosureRegisterIndex;
+}
+
+Register Register::current_context() {
+  return Register(kCurrentContextRegisterIndex);
+}
+
+bool Register::is_current_context() const {
+  return index() == kCurrentContextRegisterIndex;
+}
+
+Register Register::new_target() { return Register(kNewTargetRegisterIndex); }
+
+bool Register::is_new_target() const {
+  return index() == kNewTargetRegisterIndex;
+}
+
+Register Register::bytecode_array() {
+  return Register(kBytecodeArrayRegisterIndex);
+}
+
+bool Register::is_bytecode_array() const {
+  return index() == kBytecodeArrayRegisterIndex;
+}
+
+Register Register::bytecode_offset() {
+  return Register(kBytecodeOffsetRegisterIndex);
+}
+
+bool Register::is_bytecode_offset() const {
+  return index() == kBytecodeOffsetRegisterIndex;
+}
+
+// static
+Register Register::virtual_accumulator() {
+  return Register(kCallerPCOffsetRegisterIndex);
+}
+
+OperandSize Register::SizeOfOperand() const {
+  int32_t operand = ToOperand();
+  if (operand >= kMinInt8 && operand <= kMaxInt8) {
+    return OperandSize::kByte;
+  } else if (operand >= kMinInt16 && operand <= kMaxInt16) {
+    return OperandSize::kShort;
+  } else {
+    return OperandSize::kQuad;
+  }
+}
+
+bool Register::AreContiguous(Register reg1, Register reg2, Register reg3,
+                             Register reg4, Register reg5) {
+  if (reg1.index() + 1 != reg2.index()) {
+    return false;
+  }
+  if (reg3.is_valid() && reg2.index() + 1 != reg3.index()) {
+    return false;
+  }
+  if (reg4.is_valid() && reg3.index() + 1 != reg4.index()) {
+    return false;
+  }
+  if (reg5.is_valid() && reg4.index() + 1 != reg5.index()) {
+    return false;
+  }
+  return true;
+}
+
+std::string Register::ToString(int parameter_count) {
+  if (is_current_context()) {
+    return std::string("<context>");
+  } else if (is_function_closure()) {
+    return std::string("<closure>");
+  } else if (is_new_target()) {
+    return std::string("<new.target>");
+  } else if (is_parameter()) {
+    int parameter_index = ToParameterIndex(parameter_count);
+    if (parameter_index == 0) {
+      return std::string("<this>");
+    } else {
+      std::ostringstream s;
+      s << "a" << parameter_index - 1;
+      return s.str();
+    }
+  } else {
+    std::ostringstream s;
+    s << "r" << index();
+    return s.str();
+  }
+}
+
+}  // namespace interpreter
+}  // namespace internal
+}  // namespace v8