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1 // Copyright 2008 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 #include "v8.h" | |
29 | |
30 #include "codegen-inl.h" | |
31 #include "register-allocator-inl.h" | |
32 | |
33 namespace v8 { namespace internal { | |
34 | |
35 // ------------------------------------------------------------------------- | |
36 // Result implementation. | |
37 | |
38 void Result::ToRegister() { | |
39 ASSERT(is_valid()); | |
40 if (is_constant()) { | |
41 Result fresh = cgen_->allocator()->Allocate(); | |
42 ASSERT(fresh.is_valid()); | |
43 if (cgen_->IsUnsafeSmi(handle())) { | |
44 cgen_->LoadUnsafeSmi(fresh.reg(), handle()); | |
45 } else { | |
46 cgen_->masm()->Set(fresh.reg(), Immediate(handle())); | |
47 } | |
48 // This result becomes a copy of the fresh one. | |
49 *this = fresh; | |
50 } | |
51 ASSERT(is_register()); | |
52 } | |
53 | |
54 | |
55 void Result::ToRegister(Register target) { | |
56 ASSERT(is_valid()); | |
57 if (!is_register() || !reg().is(target)) { | |
58 Result fresh = cgen_->allocator()->Allocate(target); | |
59 ASSERT(fresh.is_valid()); | |
60 if (is_register()) { | |
61 cgen_->masm()->mov(fresh.reg(), reg()); | |
62 } else { | |
63 ASSERT(is_constant()); | |
64 if (cgen_->IsUnsafeSmi(handle())) { | |
65 cgen_->LoadUnsafeSmi(fresh.reg(), handle()); | |
66 } else { | |
67 cgen_->masm()->Set(fresh.reg(), Immediate(handle())); | |
68 } | |
69 } | |
70 *this = fresh; | |
71 } else if (is_register() && reg().is(target)) { | |
72 ASSERT(cgen_->has_valid_frame()); | |
73 cgen_->frame()->Spill(target); | |
74 ASSERT(cgen_->allocator()->count(target) == 1); | |
75 } | |
76 ASSERT(is_register()); | |
77 ASSERT(reg().is(target)); | |
78 } | |
79 | |
80 | |
81 // ------------------------------------------------------------------------- | |
82 // RegisterAllocator implementation. | |
83 | |
84 RegisterFile RegisterAllocator::Reserved() { | |
85 RegisterFile reserved; | |
86 reserved.Use(esp); | |
87 reserved.Use(ebp); | |
88 reserved.Use(esi); | |
89 return reserved; | |
90 } | |
91 | |
92 | |
93 void RegisterAllocator::UnuseReserved(RegisterFile* register_file) { | |
94 register_file->ref_counts_[esp.code()] = 0; | |
95 register_file->ref_counts_[ebp.code()] = 0; | |
96 register_file->ref_counts_[esi.code()] = 0; | |
97 } | |
98 | |
99 | |
100 void RegisterAllocator::Initialize() { | |
101 Reset(); | |
102 // The following register is live on function entry, saved in the | |
103 // frame, and available for allocation during execution. | |
104 Use(edi); // JS function. | |
105 } | |
106 | |
107 | |
108 void RegisterAllocator::Reset() { | |
109 registers_.Reset(); | |
110 // The following registers are live on function entry and reserved | |
111 // during execution. | |
112 Use(esp); // Stack pointer. | |
113 Use(ebp); // Frame pointer (caller's frame pointer on entry). | |
114 Use(esi); // Context (callee's context on entry). | |
115 } | |
116 | |
117 | |
118 Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() { | |
119 Result result = AllocateWithoutSpilling(); | |
120 // Check that the register is a byte register. If not, unuse the | |
121 // register if valid and return an invalid result. | |
122 if (result.is_valid() && !result.reg().is_byte_register()) { | |
123 result.Unuse(); | |
124 return Result(cgen_); | |
125 } | |
126 return result; | |
127 } | |
128 | |
129 | |
130 } } // namespace v8::internal | |
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