fieldType.cpp revision 1879:f95d63e2154a 
1/*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "classfile/systemDictionary.hpp"
27#include "memory/oopFactory.hpp"
28#include "oops/oop.inline.hpp"
29#include "oops/typeArrayKlass.hpp"
30#include "runtime/fieldType.hpp"
31#include "runtime/signature.hpp"
32
33void FieldType::skip_optional_size(symbolOop signature, int* index) {
34  jchar c = signature->byte_at(*index);
35  while (c >= '0' && c <= '9') {
36    *index = *index + 1;
37    c = signature->byte_at(*index);
38  }
39}
40
41BasicType FieldType::basic_type(symbolOop signature) {
42  return char2type(signature->byte_at(0));
43}
44
45// Check if it is a valid array signature
46bool FieldType::is_valid_array_signature(symbolOop sig) {
47  assert(sig->utf8_length() > 1, "this should already have been checked");
48  assert(sig->byte_at(0) == '[', "this should already have been checked");
49  // The first character is already checked
50  int i = 1;
51  int len = sig->utf8_length();
52  // First skip all '['s
53  while(i < len - 1 && sig->byte_at(i) == '[') i++;
54
55  // Check type
56  switch(sig->byte_at(i)) {
57    case 'B': // T_BYTE
58    case 'C': // T_CHAR
59    case 'D': // T_DOUBLE
60    case 'F': // T_FLOAT
61    case 'I': // T_INT
62    case 'J': // T_LONG
63    case 'S': // T_SHORT
64    case 'Z': // T_BOOLEAN
65      // If it is an array, the type is the last character
66      return (i + 1 == len);
67    case 'L':
68      // If it is an object, the last character must be a ';'
69      return sig->byte_at(len - 1) == ';';
70  }
71
72  return false;
73}
74
75
76BasicType FieldType::get_array_info(symbolOop signature, jint* dimension, symbolOop* object_key, TRAPS) {
77  assert(basic_type(signature) == T_ARRAY, "must be array");
78  int index = 1;
79  int dim   = 1;
80  skip_optional_size(signature, &index);
81  while (signature->byte_at(index) == '[') {
82    index++;
83    dim++;
84    skip_optional_size(signature, &index);
85  }
86  ResourceMark rm;
87  symbolOop element = oopFactory::new_symbol(signature->as_C_string() + index, CHECK_(T_BYTE));
88  BasicType element_type = FieldType::basic_type(element);
89  if (element_type == T_OBJECT) {
90    char* object_type = element->as_C_string();
91    object_type[element->utf8_length() - 1] = '\0';
92    *object_key = oopFactory::new_symbol(object_type + 1, CHECK_(T_BYTE));
93  }
94  // Pass dimension back to caller
95  *dimension = dim;
96  return element_type;
97}
98