C++ methodHandle::is_static方法代码示例

  SlowSignatureHandler(methodHandle method, intptr_t* from, intptr_t* to) 
    : NativeSignatureIterator(method)
  {
    _from = from;
    _to   = to;

    _reg_args = to - (method->is_static() ? 4 : 5);
    _fp_identifiers = to - 2;
    _to = _to + 4;  // Windows reserves stack space for register arguments
    *(int*) _fp_identifiers = 0;
    _num_args = (method->is_static() ? 1 : 0);
  }

    // Creation
    SignatureHandlerGenerator(methodHandle method, CodeBuffer* buffer) : NativeSignatureIterator(method) {
        _masm = new MacroAssembler(buffer);
#ifdef AMD64
#ifdef _WIN64
        _num_args = (method->is_static() ? 1 : 0);
        _stack_offset = (Argument::n_int_register_parameters_c+1)* wordSize; // don't overwrite return address
#else
        _num_int_args = (method->is_static() ? 1 : 0);
        _num_fp_args = 0;
        _stack_offset = wordSize; // don't overwrite return address
#endif // _WIN64
#endif // AMD64
    }

// Check all the formats of native implementation name to see if there is one
// for the specified method.
address NativeLookup::lookup_critical_entry(methodHandle method) {
  if (!CriticalJNINatives) return NULL;

  if (method->is_synchronized() ||
      !method->is_static()) {
    // Only static non-synchronized methods are allowed
    return NULL;
  }

  ResourceMark rm;
  address entry = NULL;

  Symbol* signature = method->signature();
  for (int end = 0; end < signature->utf8_length(); end++) {
    if (signature->byte_at(end) == 'L') {
      // Don't allow object types
      return NULL;
    }
  }

  // Compute critical name
  char* critical_name = critical_jni_name(method);

  // Compute argument size
  int args_size = 1                             // JNIEnv
                + (method->is_static() ? 1 : 0) // class for static methods
                + method->size_of_parameters(); // actual parameters


  // 1) Try JNI short style
  entry = lookup_critical_style(method, critical_name, "",        args_size, true);
  if (entry != NULL) return entry;

  // Compute long name
  char* long_name = long_jni_name(method);

  // 2) Try JNI long style
  entry = lookup_critical_style(method, critical_name, long_name, args_size, true);
  if (entry != NULL) return entry;

  // 3) Try JNI short style without os prefix/suffix
  entry = lookup_critical_style(method, critical_name, "",        args_size, false);
  if (entry != NULL) return entry;

  // 4) Try JNI long style without os prefix/suffix
  entry = lookup_critical_style(method, critical_name, long_name, args_size, false);

  return entry; // NULL indicates not found
}

 SlowSignatureHandler(methodHandle method, intptr_t* from, intptr_t* to, intptr_t *RegArgSig) : NativeSignatureIterator(method) {
   _from = from;
   _to   = to;
   _RegArgSignature = RegArgSig;	
   *_RegArgSignature = 0;
   _argcount = method->is_static() ? 2 : 1;
 }

// Check all the formats of native implementation name to see if there is one
// for the specified method.
address NativeLookup::lookup_entry(methodHandle method, bool& in_base_library, TRAPS) {
  address entry = NULL;
  in_base_library = false;

  // Compute pure name
  char* pure_name = pure_jni_name(method);

  //计算指定本地方法的参数数量
  int args_size = 1                             // JNIEnv
                + (method->is_static() ? 1 : 0) // class for static methods
                + method->size_of_parameters(); // actual parameters


  // 1) Try JNI short style
  entry = lookup_style(method, pure_name, "",        args_size, true,  in_base_library, CHECK_NULL);
  if (entry != NULL) return entry;

  // Compute long name
  char* long_name = long_jni_name(method);

  // 2) Try JNI long style
  entry = lookup_style(method, pure_name, long_name, args_size, true,  in_base_library, CHECK_NULL);
  if (entry != NULL) return entry;

  // 3) Try JNI short style without os prefix/suffix
  entry = lookup_style(method, pure_name, "",        args_size, false, in_base_library, CHECK_NULL);
  if (entry != NULL) return entry;

  // 4) Try JNI long style without os prefix/suffix
  entry = lookup_style(method, pure_name, long_name, args_size, false, in_base_library, CHECK_NULL);

  return entry; // NULL indicates not found
}

VerificationType StackMapFrame::set_locals_from_arg(
    const methodHandle m, VerificationType thisKlass, TRAPS) {
  SignatureStream ss(m->signature());
  int init_local_num = 0;
  if (!m->is_static()) {
    init_local_num++;
    // add one extra argument for instance method
    if (m->name() == vmSymbols::object_initializer_name() &&
       thisKlass.name() != vmSymbols::java_lang_Object()) {
      _locals[0] = VerificationType::uninitialized_this_type();
      _flags |= FLAG_THIS_UNINIT;
    } else {
      _locals[0] = thisKlass;
    }
  }

  // local num may be greater than size of parameters because long/double occupies two slots
  while(!ss.at_return_type()) {
    init_local_num += _verifier->change_sig_to_verificationType(
      &ss, &_locals[init_local_num],
      CHECK_VERIFY_(verifier(), VerificationType::bogus_type()));
    ss.next();
  }
  _locals_size = init_local_num;

  switch (ss.type()) {
    case T_OBJECT:
    case T_ARRAY:
    {
      Symbol* sig = ss.as_symbol(CHECK_(VerificationType::bogus_type()));
      // Create another symbol to save as signature stream unreferences
      // this symbol.
      Symbol* sig_copy =
        verifier()->create_temporary_symbol(sig, 0, sig->utf8_length(),
                                 CHECK_(VerificationType::bogus_type()));
      assert(sig_copy == sig, "symbols don't match");
      return VerificationType::reference_type(sig_copy);
    }
    case T_INT:     return VerificationType::integer_type();
    case T_BYTE:    return VerificationType::byte_type();
    case T_CHAR:    return VerificationType::char_type();
    case T_SHORT:   return VerificationType::short_type();
    case T_BOOLEAN: return VerificationType::boolean_type();
    case T_FLOAT:   return VerificationType::float_type();
    case T_DOUBLE:  return VerificationType::double_type();
    case T_LONG:    return VerificationType::long_type();
    case T_VOID:    return VerificationType::bogus_type();
    default:
      ShouldNotReachHere();
  }
  return VerificationType::bogus_type();
}

  uint64_t fingerprint() {
    // See if we fingerprinted this method already
    if (mh->constMethod()->fingerprint() != CONST64(0)) {
      return mh->constMethod()->fingerprint();
    }

    if (mh->size_of_parameters() > max_size_of_parameters ) {
      _fingerprint = UCONST64(-1);
      mh->constMethod()->set_fingerprint(_fingerprint);
      return _fingerprint;
    }

    assert( (int)mh->result_type() <= (int)result_feature_mask, "bad result type");
    _fingerprint = mh->result_type();
    _fingerprint <<= static_feature_size;
    if (mh->is_static())  _fingerprint |= 1;
    _shift_count = result_feature_size + static_feature_size;
    iterate_parameters();
    _fingerprint |= ((uint64_t)done_parm) << _shift_count;// mark end of sig
    mh->constMethod()->set_fingerprint(_fingerprint);
    return _fingerprint;
  }