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#ifndef V8_IA32_REGISTER_ALLOCATOR_IA32_INL_H_
#define V8_IA32_REGISTER_ALLOCATOR_IA32_INL_H_

#include "v8.h"

namespace v8 {
namespace internal {

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

bool RegisterAllocator::IsReserved(Register reg) {
  // The code for this test relies on the order of register codes.
  return reg.code() >= esp.code() && reg.code() <= esi.code();
}


// The register allocator uses small integers to represent the
// non-reserved assembler registers.  The mapping is:

// eax <-> 0, ebx <-> 1, ecx <-> 2, edx <-> 3, edi <-> 4.

int RegisterAllocator::ToNumber(Register reg) {
  ASSERT(reg.is_valid() && !IsReserved(reg));
  const int kNumbers[] = {
    0,   // eax
    2,   // ecx
    3,   // edx
    1,   // ebx
    -1,  // esp
    -1,  // ebp
    -1,  // esi
    4    // edi
  };
  return kNumbers[reg.code()];
}


Register RegisterAllocator::ToRegister(int num) {
  ASSERT(num >= 0 && num < kNumRegisters);
  const Register kRegisters[] = { eax, ebx, ecx, edx, edi };
  return kRegisters[num];
}


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


} }  // namespace v8::internal

#endif  // V8_IA32_REGISTER_ALLOCATOR_IA32_INL_H_