1// Copyright 2009 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
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8//     * Redistributions in binary form must reproduce the above
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13//       contributors may be used to endorse or promote products derived
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15//
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17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#ifndef V8_X64_REGISTER_ALLOCATOR_X64_INL_H_
29#define V8_X64_REGISTER_ALLOCATOR_X64_INL_H_
30
31#include "v8.h"
32
33namespace v8 {
34namespace internal {
35
36// -------------------------------------------------------------------------
37// RegisterAllocator implementation.
38
39bool RegisterAllocator::IsReserved(Register reg) {
40  return reg.is(rsp) || reg.is(rbp) || reg.is(rsi) ||
41      reg.is(kScratchRegister);
42}
43
44
45// The register allocator uses small integers to represent the
46// non-reserved assembler registers.
47int RegisterAllocator::ToNumber(Register reg) {
48  ASSERT(reg.is_valid() && !IsReserved(reg));
49  const int kNumbers[] = {
50    0,   // rax
51    2,   // rcx
52    3,   // rdx
53    1,   // rbx
54    -1,  // rsp  Stack pointer.
55    -1,  // rbp  Frame pointer.
56    -1,  // rsi  Context.
57    4,   // rdi
58    5,   // r8
59    6,   // r9
60    -1,  // r10  Scratch register.
61    9,   // r11
62    10,  // r12
63    -1,  // r13  Roots array.  This is callee saved.
64    7,   // r14
65    8    // r15
66  };
67  return kNumbers[reg.code()];
68}
69
70
71Register RegisterAllocator::ToRegister(int num) {
72  ASSERT(num >= 0 && num < kNumRegisters);
73  const Register kRegisters[] =
74      { rax, rbx, rcx, rdx, rdi, r8, r9, r14, r15, r11, r12 };
75  return kRegisters[num];
76}
77
78
79void RegisterAllocator::Initialize() {
80  Reset();
81  // The non-reserved rdi register is live on JS function entry.
82  Use(rdi);  // JS function.
83}
84} }  // namespace v8::internal
85
86#endif  // V8_X64_REGISTER_ALLOCATOR_X64_INL_H_
87