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      1 // Copyright 2014 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_COMPILER_REGISTER_CONFIGURATION_H_
      6 #define V8_COMPILER_REGISTER_CONFIGURATION_H_
      7 
      8 #include "src/base/macros.h"
      9 
     10 namespace v8 {
     11 namespace internal {
     12 
     13 // An architecture independent representation of the sets of registers available
     14 // for instruction creation.
     15 class RegisterConfiguration {
     16  public:
     17   // Define the optimized compiler selector for register configuration
     18   // selection.
     19   //
     20   // TODO(X87): This distinction in RegisterConfigurations is temporary
     21   // until x87 TF supports all of the registers that Crankshaft does.
     22   enum CompilerSelector { CRANKSHAFT, TURBOFAN };
     23 
     24   // Architecture independent maxes.
     25   static const int kMaxGeneralRegisters = 32;
     26   static const int kMaxDoubleRegisters = 32;
     27 
     28   static const RegisterConfiguration* ArchDefault(CompilerSelector compiler);
     29 
     30   RegisterConfiguration(int num_general_registers, int num_double_registers,
     31                         int num_allocatable_general_registers,
     32                         int num_allocatable_double_registers,
     33                         int num_allocatable_aliased_double_registers,
     34                         const int* allocatable_general_codes,
     35                         const int* allocatable_double_codes,
     36                         char const* const* general_names,
     37                         char const* const* double_names);
     38 
     39   int num_general_registers() const { return num_general_registers_; }
     40   int num_double_registers() const { return num_double_registers_; }
     41   int num_allocatable_general_registers() const {
     42     return num_allocatable_general_registers_;
     43   }
     44   int num_allocatable_double_registers() const {
     45     return num_allocatable_double_registers_;
     46   }
     47   // TODO(turbofan): This is a temporary work-around required because our
     48   // register allocator does not yet support the aliasing of single/double
     49   // registers on ARM.
     50   int num_allocatable_aliased_double_registers() const {
     51     return num_allocatable_aliased_double_registers_;
     52   }
     53   int32_t allocatable_general_codes_mask() const {
     54     return allocatable_general_codes_mask_;
     55   }
     56   int32_t allocatable_double_codes_mask() const {
     57     return allocatable_double_codes_mask_;
     58   }
     59   int GetAllocatableGeneralCode(int index) const {
     60     return allocatable_general_codes_[index];
     61   }
     62   int GetAllocatableDoubleCode(int index) const {
     63     return allocatable_double_codes_[index];
     64   }
     65   const char* GetGeneralRegisterName(int code) const {
     66     return general_register_names_[code];
     67   }
     68   const char* GetDoubleRegisterName(int code) const {
     69     return double_register_names_[code];
     70   }
     71   const int* allocatable_general_codes() const {
     72     return allocatable_general_codes_;
     73   }
     74   const int* allocatable_double_codes() const {
     75     return allocatable_double_codes_;
     76   }
     77 
     78  private:
     79   const int num_general_registers_;
     80   const int num_double_registers_;
     81   int num_allocatable_general_registers_;
     82   int num_allocatable_double_registers_;
     83   int num_allocatable_aliased_double_registers_;
     84   int32_t allocatable_general_codes_mask_;
     85   int32_t allocatable_double_codes_mask_;
     86   const int* allocatable_general_codes_;
     87   const int* allocatable_double_codes_;
     88   char const* const* general_register_names_;
     89   char const* const* double_register_names_;
     90 };
     91 
     92 }  // namespace internal
     93 }  // namespace v8
     94 
     95 #endif  // V8_COMPILER_REGISTER_CONFIGURATION_H_
     96