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_ 83
