Re-reland: Remove register index/code indirection

src/register-configuration.h

+// Copyright 2014 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.
+
+#ifndef V8_COMPILER_REGISTER_CONFIGURATION_H_
+#define V8_COMPILER_REGISTER_CONFIGURATION_H_
+
+#include "src/base/macros.h"
+
+namespace v8 {
+namespace internal {
+
+// An architecture independent representation of the sets of registers available
+// for instruction creation.
+class RegisterConfiguration {
+ public:
+  // Architecture independent maxes.
+  static const int kMaxGeneralRegisters = 32;
+  static const int kMaxDoubleRegisters = 32;
+
+  static const RegisterConfiguration* ArchDefault();
+
+  RegisterConfiguration(int num_general_registers, int num_double_registers,
+                        int num_allocatable_general_registers,
+                        int num_allocatable_double_registers,
+                        int num_allocatable_aliased_double_registers,
+                        const int* allocatable_general_codes,
+                        const int* allocatable_double_codes,
+                        char const* const* general_names,
+                        char const* const* double_names);
+
+  int num_general_registers() const { return num_general_registers_; }
+  int num_double_registers() const { return num_double_registers_; }
+  int num_allocatable_general_registers() const {
+    return num_allocatable_general_registers_;
+  }
+  int num_allocatable_double_registers() const {
+    return num_allocatable_double_registers_;
+  }
+  // TODO(turbofan): This is a temporary work-around required because our
+  // register allocator does not yet support the aliasing of single/double
+  // registers on ARM.
+  int num_allocatable_aliased_double_registers() const {
+    return num_allocatable_aliased_double_registers_;
+  }
+  int32_t allocatable_general_codes_mask() const {
+    return allocatable_general_codes_mask_;
+  }
+  int32_t allocatable_double_codes_mask() const {
+    return allocatable_double_codes_mask_;
+  }
+  int GetAllocatableGeneralCode(int index) const {
+    return allocatable_general_codes_[index];
+  }
+  int GetAllocatableDoubleCode(int index) const {
+    return allocatable_double_codes_[index];
+  }
+  const char* GetGeneralRegisterName(int code) const {
+    return general_register_names_[code];
+  }
+  const char* GetDoubleRegisterName(int code) const {
+    return double_register_names_[code];
+  }
+  const int* allocatable_general_codes() const {
+    return allocatable_general_codes_;
+  }
+  const int* allocatable_double_codes() const {
+    return allocatable_double_codes_;
+  }
+
+ private:
+  const int num_general_registers_;
+  const int num_double_registers_;
+  int num_allocatable_general_registers_;
+  int num_allocatable_double_registers_;
+  int num_allocatable_aliased_double_registers_;
+  int32_t allocatable_general_codes_mask_;
+  int32_t allocatable_double_codes_mask_;
+  const int* allocatable_general_codes_;
+  const int* allocatable_double_codes_;
+  char const* const* general_register_names_;
+  char const* const* double_register_names_;
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_REGISTER_CONFIGURATION_H_