// Copyright 2009 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//
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#ifndef V8_X64_REGISTER_ALLOCATOR_X64_INL_H_
#define V8_X64_REGISTER_ALLOCATOR_X64_INL_H_

#include "v8.h"

namespace v8 {
namespace internal {

// -------------------------------------------------------------------------
// RegisterAllocator implementation.

bool RegisterAllocator::IsReserved(Register reg) {
  return reg.is(rsp) || reg.is(rbp) || reg.is(rsi) ||
      reg.is(kScratchRegister);
}


// The register allocator uses small integers to represent the
// non-reserved assembler registers.
int RegisterAllocator::ToNumber(Register reg) {
  ASSERT(reg.is_valid() && !IsReserved(reg));
  static const int numbers[] = {
    0,   // rax
    2,   // rcx
    3,   // rdx
    1,   // rbx
    -1,  // rsp
    -1,  // rbp
    -1,  // rsi
    4,   // rdi
    5,   // r8
    6,   // r9
    -1,  // r10
    7,   // r11
    11,  // r12
    10,   // r13
    8,   // r14
    9   // r15
  };
  return numbers[reg.code()];
}


Register RegisterAllocator::ToRegister(int num) {
  ASSERT(num >= 0 && num < kNumRegisters);
  static Register registers[] =
      { rax, rbx, rcx, rdx, rdi, r8, r9, r11, r14, r15, r13, r12 };
  return registers[num];
}


void RegisterAllocator::Initialize() {
  Reset();
  // The non-reserved rdi register is live on JS function entry.
  Use(rdi);  // JS function.
}
} }  // namespace v8::internal

#endif  // V8_X64_REGISTER_ALLOCATOR_X64_INL_H_
