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_X64_REGISTER_ALLOCATOR_X64_INL_H_ 29 #define V8_X64_REGISTER_ALLOCATOR_X64_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 return reg.is(rsp) || reg.is(rbp) || reg.is(rsi) || 41 reg.is(kScratchRegister); 42 } 43 44 45 // The register allocator uses small integers to represent the 46 // non-reserved assembler registers. 47 int RegisterAllocator::ToNumber(Register reg) { 48 ASSERT(reg.is_valid() && !IsReserved(reg)); 49 const int kNumbers[] = { 50 0, // rax 51 2, // rcx 52 3, // rdx 53 1, // rbx 54 -1, // rsp Stack pointer. 55 -1, // rbp Frame pointer. 56 -1, // rsi Context. 57 4, // rdi 58 5, // r8 59 6, // r9 60 -1, // r10 Scratch register. 61 9, // r11 62 10, // r12 63 -1, // r13 Roots array. This is callee saved. 64 7, // r14 65 8 // r15 66 }; 67 return kNumbers[reg.code()]; 68 } 69 70 71 Register RegisterAllocator::ToRegister(int num) { 72 ASSERT(num >= 0 && num < kNumRegisters); 73 const Register kRegisters[] = 74 { rax, rbx, rcx, rdx, rdi, r8, r9, r14, r15, r11, r12 }; 75 return kRegisters[num]; 76 } 77 78 79 void RegisterAllocator::Initialize() { 80 Reset(); 81 // The non-reserved rdi register is live on JS function entry. 82 Use(rdi); // JS function. 83 } 84 } } // namespace v8::internal 85 86 #endif // V8_X64_REGISTER_ALLOCATOR_X64_INL_H_ 87