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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_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