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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7 // notice, this list of conditions and the following disclaimer.
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9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
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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
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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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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
33 namespace v8 {
34 namespace internal {
35
36 // -------------------------------------------------------------------------
37 // RegisterAllocator implementation.
38
IsReserved(Register reg)39 bool 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
ToNumber(Register reg)61 int 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
ToRegister(int num)85 Register 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
Initialize()93 void 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