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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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