fieldType.cpp revision 0:a61af66fc99e 
1/*
2 * Copyright 1997-2000 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25# include "incls/_precompiled.incl"
26# include "incls/_fieldType.cpp.incl"
27
28void FieldType::skip_optional_size(symbolOop signature, int* index) {
29  jchar c = signature->byte_at(*index);
30  while (c >= '0' && c <= '9') {
31    *index = *index + 1;
32    c = signature->byte_at(*index);
33  }
34}
35
36BasicType FieldType::basic_type(symbolOop signature) {
37  return char2type(signature->byte_at(0));
38}
39
40// Check if it is a valid array signature
41bool FieldType::is_valid_array_signature(symbolOop sig) {
42  assert(sig->utf8_length() > 1, "this should already have been checked");
43  assert(sig->byte_at(0) == '[', "this should already have been checked");
44  // The first character is already checked
45  int i = 1;
46  int len = sig->utf8_length();
47  // First skip all '['s
48  while(i < len - 1 && sig->byte_at(i) == '[') i++;
49
50  // Check type
51  switch(sig->byte_at(i)) {
52    case 'B': // T_BYTE
53    case 'C': // T_CHAR
54    case 'D': // T_DOUBLE
55    case 'F': // T_FLOAT
56    case 'I': // T_INT
57    case 'J': // T_LONG
58    case 'S': // T_SHORT
59    case 'Z': // T_BOOLEAN
60      // If it is an array, the type is the last character
61      return (i + 1 == len);
62    case 'L':
63      // If it is an object, the last character must be a ';'
64      return sig->byte_at(len - 1) == ';';
65  }
66
67  return false;
68}
69
70
71BasicType FieldType::get_array_info(symbolOop signature, jint* dimension, symbolOop* object_key, TRAPS) {
72  assert(basic_type(signature) == T_ARRAY, "must be array");
73  int index = 1;
74  int dim   = 1;
75  skip_optional_size(signature, &index);
76  while (signature->byte_at(index) == '[') {
77    index++;
78    dim++;
79    skip_optional_size(signature, &index);
80  }
81  ResourceMark rm;
82  symbolOop element = oopFactory::new_symbol(signature->as_C_string() + index, CHECK_(T_BYTE));
83  BasicType element_type = FieldType::basic_type(element);
84  if (element_type == T_OBJECT) {
85    char* object_type = element->as_C_string();
86    object_type[element->utf8_length() - 1] = '\0';
87    *object_key = oopFactory::new_symbol(object_type + 1, CHECK_(T_BYTE));
88  }
89  // Pass dimension back to caller
90  *dimension = dim;
91  return element_type;
92}
93