C++ methodHandle::intrinsic_id方法代码示例

AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(methodHandle m) {
  // Abstract method?
  if (m->is_abstract()) return abstract;

  // Invoker for method handles?
  if (m->is_method_handle_invoke())  return method_handle;

  // Native method?
  // Note: This test must come _before_ the test for intrinsic
  //       methods. See also comments below.
  if (m->is_native()) {
    assert(!m->is_method_handle_invoke(), "overlapping bits here, watch out");
    return m->is_synchronized() ? native_synchronized : native;
  }

  // Synchronized?
  if (m->is_synchronized()) {
    return zerolocals_synchronized;
  }

  if (RegisterFinalizersAtInit && m->code_size() == 1 &&
      m->intrinsic_id() == vmIntrinsics::_Object_init) {
    // We need to execute the special return bytecode to check for
    // finalizer registration so create a normal frame.
    return zerolocals;
  }

  // Empty method?
  if (m->is_empty_method()) {
    return empty;
  }

  // Special intrinsic method?
  // Note: This test must come _after_ the test for native methods,
  //       otherwise we will run into problems with JDK 1.2, see also
  //       AbstractInterpreterGenerator::generate_method_entry() for
  //       for details.
  switch (m->intrinsic_id()) {
    case vmIntrinsics::_dsin  : return java_lang_math_sin  ;
    case vmIntrinsics::_dcos  : return java_lang_math_cos  ;
    case vmIntrinsics::_dtan  : return java_lang_math_tan  ;
    case vmIntrinsics::_dabs  : return java_lang_math_abs  ;
    case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ;
    case vmIntrinsics::_dlog  : return java_lang_math_log  ;
    case vmIntrinsics::_dlog10: return java_lang_math_log10;

    case vmIntrinsics::_Reference_get:
                                return java_lang_ref_reference_get;
  }

  // Accessor method?
  if (m->is_accessor()) {
    assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1");
    return accessor;
  }

  // Note: for now: zero locals for all non-empty methods
  return zerolocals;
}

bool Compiler::is_intrinsic_supported(const methodHandle& method) {
  vmIntrinsics::ID id = method->intrinsic_id();
  assert(id != vmIntrinsics::_none, "must be a VM intrinsic");

  if (method->is_synchronized()) {
    // C1 does not support intrinsification of synchronized methods.
    return false;
  }

  switch (id) {
  case vmIntrinsics::_compareAndSwapLong:
    if (!VM_Version::supports_cx8()) return false;
    break;
  case vmIntrinsics::_getAndAddInt:
    if (!VM_Version::supports_atomic_getadd4()) return false;
    break;
  case vmIntrinsics::_getAndAddLong:
    if (!VM_Version::supports_atomic_getadd8()) return false;
    break;
  case vmIntrinsics::_getAndSetInt:
    if (!VM_Version::supports_atomic_getset4()) return false;
    break;
  case vmIntrinsics::_getAndSetLong:
    if (!VM_Version::supports_atomic_getset8()) return false;
    break;
  case vmIntrinsics::_getAndSetObject:
#ifdef _LP64
    if (!UseCompressedOops && !VM_Version::supports_atomic_getset8()) return false;
    if (UseCompressedOops && !VM_Version::supports_atomic_getset4()) return false;
#else
    if (!VM_Version::supports_atomic_getset4()) return false;
#endif
    break;
  case vmIntrinsics::_arraycopy:
  case vmIntrinsics::_currentTimeMillis:
  case vmIntrinsics::_nanoTime:
  case vmIntrinsics::_Reference_get:
    // Use the intrinsic version of Reference.get() so that the value in
    // the referent field can be registered by the G1 pre-barrier code.
    // Also to prevent commoning reads from this field across safepoint
    // since GC can change its value.
  case vmIntrinsics::_loadFence:
  case vmIntrinsics::_storeFence:
  case vmIntrinsics::_fullFence:
  case vmIntrinsics::_floatToRawIntBits:
  case vmIntrinsics::_intBitsToFloat:
  case vmIntrinsics::_doubleToRawLongBits:
  case vmIntrinsics::_longBitsToDouble:
  case vmIntrinsics::_getClass:
  case vmIntrinsics::_isInstance:
  case vmIntrinsics::_currentThread:
  case vmIntrinsics::_dabs:
  case vmIntrinsics::_dsqrt:
  case vmIntrinsics::_dsin:
  case vmIntrinsics::_dcos:
  case vmIntrinsics::_dtan:
  case vmIntrinsics::_dlog:
  case vmIntrinsics::_dlog10:
  case vmIntrinsics::_dexp:
  case vmIntrinsics::_dpow:
  case vmIntrinsics::_getObject:
  case vmIntrinsics::_getBoolean:
  case vmIntrinsics::_getByte:
  case vmIntrinsics::_getShort:
  case vmIntrinsics::_getChar:
  case vmIntrinsics::_getInt:
  case vmIntrinsics::_getLong:
  case vmIntrinsics::_getFloat:
  case vmIntrinsics::_getDouble:
  case vmIntrinsics::_putObject:
  case vmIntrinsics::_putBoolean:
  case vmIntrinsics::_putByte:
  case vmIntrinsics::_putShort:
  case vmIntrinsics::_putChar:
  case vmIntrinsics::_putInt:
  case vmIntrinsics::_putLong:
  case vmIntrinsics::_putFloat:
  case vmIntrinsics::_putDouble:
  case vmIntrinsics::_getObjectVolatile:
  case vmIntrinsics::_getBooleanVolatile:
  case vmIntrinsics::_getByteVolatile:
  case vmIntrinsics::_getShortVolatile:
  case vmIntrinsics::_getCharVolatile:
  case vmIntrinsics::_getIntVolatile:
  case vmIntrinsics::_getLongVolatile:
  case vmIntrinsics::_getFloatVolatile:
  case vmIntrinsics::_getDoubleVolatile:
  case vmIntrinsics::_putObjectVolatile:
  case vmIntrinsics::_putBooleanVolatile:
  case vmIntrinsics::_putByteVolatile:
  case vmIntrinsics::_putShortVolatile:
  case vmIntrinsics::_putCharVolatile:
  case vmIntrinsics::_putIntVolatile:
  case vmIntrinsics::_putLongVolatile:
  case vmIntrinsics::_putFloatVolatile:
  case vmIntrinsics::_putDoubleVolatile:
  case vmIntrinsics::_getByte_raw:
  case vmIntrinsics::_getShort_raw:
  case vmIntrinsics::_getChar_raw:
  case vmIntrinsics::_getInt_raw:
//.........这里部分代码省略.........

AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(methodHandle m) {
  // Abstract method?
  if (m->is_abstract()) return abstract;

  // Method handle primitive?
  if (m->is_method_handle_intrinsic()) {
    vmIntrinsics::ID id = m->intrinsic_id();
    assert(MethodHandles::is_signature_polymorphic(id), "must match an intrinsic");
    MethodKind kind = (MethodKind)( method_handle_invoke_FIRST +
                                    ((int)id - vmIntrinsics::FIRST_MH_SIG_POLY) );
    assert(kind <= method_handle_invoke_LAST, "parallel enum ranges");
    return kind;
  }

#ifndef CC_INTERP
  if (UseCRC32Intrinsics && m->is_native()) {
    // Use optimized stub code for CRC32 native methods.
    switch (m->intrinsic_id()) {
      case vmIntrinsics::_updateCRC32            : return java_util_zip_CRC32_update;
      case vmIntrinsics::_updateBytesCRC32       : return java_util_zip_CRC32_updateBytes;
      case vmIntrinsics::_updateByteBufferCRC32  : return java_util_zip_CRC32_updateByteBuffer;
    }
  }
#endif

  // Native method?
  // Note: This test must come _before_ the test for intrinsic
  //       methods. See also comments below.
  if (m->is_native()) {
    assert(!m->is_method_handle_intrinsic(), "overlapping bits here, watch out");
    return m->is_synchronized() ? native_synchronized : native;
  }

  // Synchronized?
  if (m->is_synchronized()) {
    return zerolocals_synchronized;
  }

  if (RegisterFinalizersAtInit && m->code_size() == 1 &&
      m->intrinsic_id() == vmIntrinsics::_Object_init) {
    // We need to execute the special return bytecode to check for
    // finalizer registration so create a normal frame.
    return zerolocals;
  }

  // Empty method?
  if (m->is_empty_method()) {
    return empty;
  }

  // Special intrinsic method?
  // Note: This test must come _after_ the test for native methods,
  //       otherwise we will run into problems with JDK 1.2, see also
  //       InterpreterGenerator::generate_method_entry() for
  //       for details.
  switch (m->intrinsic_id()) {
    case vmIntrinsics::_dsin  : return java_lang_math_sin  ;
    case vmIntrinsics::_dcos  : return java_lang_math_cos  ;
    case vmIntrinsics::_dtan  : return java_lang_math_tan  ;
    case vmIntrinsics::_dabs  : return java_lang_math_abs  ;
    case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ;
    case vmIntrinsics::_dlog  : return java_lang_math_log  ;
    case vmIntrinsics::_dlog10: return java_lang_math_log10;
    case vmIntrinsics::_dpow  : return java_lang_math_pow  ;
    case vmIntrinsics::_dexp  : return java_lang_math_exp  ;

    case vmIntrinsics::_Reference_get:
                                return java_lang_ref_reference_get;
  }

  // Accessor method?
  if (m->is_accessor()) {
    assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1");
    return accessor;
  }

  // Note: for now: zero locals for all non-empty methods
  return zerolocals;
}