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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 | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
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_IA32_REGISTER_ALLOCATOR_IA32_INL_H_ | |
29 #define V8_IA32_REGISTER_ALLOCATOR_IA32_INL_H_ | |
30 | |
31 #include "v8.h" | |
32 | |
33 namespace v8 { | |
34 namespace internal { | |
35 | |
36 // ------------------------------------------------------------------------- | |
37 // RegisterAllocator implementation. | |
38 | |
39 bool RegisterAllocator::IsReserved(Register reg) { | |
40 // The code for this test relies on the order of register codes. | |
41 return reg.code() >= esp.code() && reg.code() <= esi.code(); | |
42 } | |
43 | |
44 | |
45 // The register allocator uses small integers to represent the | |
46 // non-reserved assembler registers. The mapping is: | |
47 | |
48 // eax <-> 0, ebx <-> 1, ecx <-> 2, edx <-> 3, edi <-> 4. | |
49 | |
50 int RegisterAllocator::ToNumber(Register reg) { | |
51 ASSERT(reg.is_valid() && !IsReserved(reg)); | |
52 const int kNumbers[] = { | |
53 0, // eax | |
54 2, // ecx | |
55 3, // edx | |
56 1, // ebx | |
57 -1, // esp | |
58 -1, // ebp | |
59 -1, // esi | |
60 4 // edi | |
61 }; | |
62 return kNumbers[reg.code()]; | |
63 } | |
64 | |
65 | |
66 Register RegisterAllocator::ToRegister(int num) { | |
67 ASSERT(num >= 0 && num < kNumRegisters); | |
68 const Register kRegisters[] = { eax, ebx, ecx, edx, edi }; | |
69 return kRegisters[num]; | |
70 } | |
71 | |
72 | |
73 void RegisterAllocator::Initialize() { | |
74 Reset(); | |
75 // The non-reserved edi register is live on JS function entry. | |
76 Use(edi); // JS function. | |
77 } | |
78 | |
79 | |
80 } } // namespace v8::internal | |
81 | |
82 #endif // V8_IA32_REGISTER_ALLOCATOR_IA32_INL_H_ | |
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