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#include "src/machine-type.h"
10
11namespace v8 {
12namespace internal {
13
14// An architecture independent representation of the sets of registers available
15// for instruction creation.
16class RegisterConfiguration {
17 public:
18  enum AliasingKind {
19    // Registers alias a single register of every other size (e.g. Intel).
20    OVERLAP,
21    // Registers alias two registers of the next smaller size (e.g. ARM).
22    COMBINE
23  };
24
25  // Architecture independent maxes.
26  static const int kMaxGeneralRegisters = 32;
27  static const int kMaxFPRegisters = 32;
28
29  // Default RegisterConfigurations for the target architecture.
30  // TODO(X87): This distinction in RegisterConfigurations is temporary
31  // until x87 TF supports all of the registers that Crankshaft does.
32  static const RegisterConfiguration* Crankshaft();
33  static const RegisterConfiguration* Turbofan();
34
35  RegisterConfiguration(int num_general_registers, int num_double_registers,
36                        int num_allocatable_general_registers,
37                        int num_allocatable_double_registers,
38                        const int* allocatable_general_codes,
39                        const int* allocatable_double_codes,
40                        AliasingKind fp_aliasing_kind,
41                        char const* const* general_names,
42                        char const* const* float_names,
43                        char const* const* double_names);
44
45  int num_general_registers() const { return num_general_registers_; }
46  int num_float_registers() const { return num_float_registers_; }
47  int num_double_registers() const { return num_double_registers_; }
48  int num_allocatable_general_registers() const {
49    return num_allocatable_general_registers_;
50  }
51  int num_allocatable_double_registers() const {
52    return num_allocatable_double_registers_;
53  }
54  int num_allocatable_float_registers() const {
55    return num_allocatable_float_registers_;
56  }
57  AliasingKind fp_aliasing_kind() const { return fp_aliasing_kind_; }
58  int32_t allocatable_general_codes_mask() const {
59    return allocatable_general_codes_mask_;
60  }
61  int32_t allocatable_double_codes_mask() const {
62    return allocatable_double_codes_mask_;
63  }
64  int GetAllocatableGeneralCode(int index) const {
65    return allocatable_general_codes_[index];
66  }
67  bool IsAllocatableGeneralCode(int index) const {
68    return ((1 << index) & allocatable_general_codes_mask_) != 0;
69  }
70  int GetAllocatableDoubleCode(int index) const {
71    return allocatable_double_codes_[index];
72  }
73  bool IsAllocatableDoubleCode(int index) const {
74    return ((1 << index) & allocatable_double_codes_mask_) != 0;
75  }
76  int GetAllocatableFloatCode(int index) const {
77    return allocatable_float_codes_[index];
78  }
79  bool IsAllocatableFloatCode(int index) const {
80    return ((1 << index) & allocatable_float_codes_mask_) != 0;
81  }
82  const char* GetGeneralRegisterName(int code) const {
83    return general_register_names_[code];
84  }
85  const char* GetFloatRegisterName(int code) const {
86    return float_register_names_[code];
87  }
88  const char* GetDoubleRegisterName(int code) const {
89    return double_register_names_[code];
90  }
91  const int* allocatable_general_codes() const {
92    return allocatable_general_codes_;
93  }
94  const int* allocatable_double_codes() const {
95    return allocatable_double_codes_;
96  }
97  const int* allocatable_float_codes() const {
98    return allocatable_float_codes_;
99  }
100
101  // Aliasing calculations for floating point registers, when fp_aliasing_kind()
102  // is COMBINE. Currently only implemented for kFloat32, or kFloat64 reps.
103  // Returns the number of aliases, and if > 0, alias_base_index is set to the
104  // index of the first alias.
105  int GetAliases(MachineRepresentation rep, int index,
106                 MachineRepresentation other_rep, int* alias_base_index) const;
107  // Returns a value indicating whether two registers alias each other, when
108  // fp_aliasing_kind() is COMBINE. Currently only implemented for kFloat32, or
109  // kFloat64 reps.
110  bool AreAliases(MachineRepresentation rep, int index,
111                  MachineRepresentation other_rep, int other_index) const;
112
113 private:
114  const int num_general_registers_;
115  int num_float_registers_;
116  const int num_double_registers_;
117  int num_allocatable_general_registers_;
118  int num_allocatable_double_registers_;
119  int num_allocatable_float_registers_;
120  int32_t allocatable_general_codes_mask_;
121  int32_t allocatable_double_codes_mask_;
122  int32_t allocatable_float_codes_mask_;
123  const int* allocatable_general_codes_;
124  const int* allocatable_double_codes_;
125  int allocatable_float_codes_[kMaxFPRegisters];
126  AliasingKind fp_aliasing_kind_;
127  char const* const* general_register_names_;
128  char const* const* float_register_names_;
129  char const* const* double_register_names_;
130};
131
132}  // namespace internal
133}  // namespace v8
134
135#endif  // V8_COMPILER_REGISTER_CONFIGURATION_H_
136