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//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#ifndef V8_ARM_REGISTER_ALLOCATOR_ARM_INL_H_
29#define V8_ARM_REGISTER_ALLOCATOR_ARM_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(cp) || reg.is(fp) || reg.is(sp) || reg.is(pc);
41}
42
43
44
45// The register allocator uses small integers to represent the
46// non-reserved assembler registers.  The mapping is:
47//
48// r0 <-> 0
49// r1 <-> 1
50// r2 <-> 2
51// r3 <-> 3
52// r4 <-> 4
53// r5 <-> 5
54// r6 <-> 6
55// r7 <-> 7
56// r9 <-> 8
57// r10 <-> 9
58// ip <-> 10
59// lr <-> 11
60
61int RegisterAllocator::ToNumber(Register reg) {
62  ASSERT(reg.is_valid() && !IsReserved(reg));
63  const int kNumbers[] = {
64    0,   // r0
65    1,   // r1
66    2,   // r2
67    3,   // r3
68    4,   // r4
69    5,   // r5
70    6,   // r6
71    7,   // r7
72    -1,  // cp
73    8,   // r9
74    9,   // r10
75    -1,  // fp
76    10,  // ip
77    -1,  // sp
78    11,  // lr
79    -1   // pc
80  };
81  return kNumbers[reg.code()];
82}
83
84
85Register RegisterAllocator::ToRegister(int num) {
86  ASSERT(num >= 0 && num < kNumRegisters);
87  const Register kRegisters[] =
88      { r0, r1, r2, r3, r4, r5, r6, r7, r9, r10, ip, lr };
89  return kRegisters[num];
90}
91
92
93void RegisterAllocator::Initialize() {
94  Reset();
95  // The non-reserved r1 and lr registers are live on JS function entry.
96  Use(r1);  // JS function.
97  Use(lr);  // Return address.
98}
99
100
101} }  // namespace v8::internal
102
103#endif  // V8_ARM_REGISTER_ALLOCATOR_ARM_INL_H_
104