ciObjArrayKlass.cpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 1999, 2007, 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.
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23 */
24
25#include "incls/_precompiled.incl"
26#include "incls/_ciObjArrayKlass.cpp.incl"
27
28// ciObjArrayKlass
29//
30// This class represents a klassOop in the HotSpot virtual machine
31// whose Klass part is an objArrayKlass.
32
33// ------------------------------------------------------------------
34// ciObjArrayKlass::ciObjArrayKlass
35//
36// Constructor for loaded object array klasses.
37ciObjArrayKlass::ciObjArrayKlass(KlassHandle h_k) : ciArrayKlass(h_k) {
38  assert(get_Klass()->oop_is_objArray(), "wrong type");
39  klassOop element_klassOop = get_objArrayKlass()->bottom_klass();
40  _base_element_klass = CURRENT_ENV->get_object(element_klassOop)->as_klass();
41  assert(_base_element_klass->is_instance_klass() ||
42         _base_element_klass->is_type_array_klass(), "bad base klass");
43  if (dimension() == 1) {
44    _element_klass = _base_element_klass;
45  } else {
46    _element_klass = NULL;
47  }
48  if (!ciObjectFactory::is_initialized()) {
49    assert(_element_klass->is_java_lang_Object(), "only arrays of object are shared");
50  }
51}
52
53// ------------------------------------------------------------------
54// ciObjArrayKlass::ciObjArrayKlass
55//
56// Constructor for unloaded object array klasses.
57ciObjArrayKlass::ciObjArrayKlass(ciSymbol* array_name,
58                                 ciKlass* base_element_klass,
59                                 int dimension)
60  : ciArrayKlass(array_name,
61                 dimension,
62                 ciObjArrayKlassKlass::make()) {
63    _base_element_klass = base_element_klass;
64    assert(_base_element_klass->is_instance_klass() ||
65           _base_element_klass->is_type_array_klass(), "bad base klass");
66    if (dimension == 1) {
67      _element_klass = base_element_klass;
68    } else {
69      _element_klass = NULL;
70    }
71}
72
73// ------------------------------------------------------------------
74// ciObjArrayKlass::element_klass
75//
76// What is the one-level element type of this array?
77ciKlass* ciObjArrayKlass::element_klass() {
78  if (_element_klass == NULL) {
79    assert(dimension() > 1, "_element_klass should not be NULL");
80    // Produce the element klass.
81    if (is_loaded()) {
82      VM_ENTRY_MARK;
83      klassOop element_klassOop = get_objArrayKlass()->element_klass();
84      _element_klass = CURRENT_THREAD_ENV->get_object(element_klassOop)->as_klass();
85    } else {
86      VM_ENTRY_MARK;
87      // We are an unloaded array klass.  Attempt to fetch our
88      // element klass by name.
89      _element_klass = CURRENT_THREAD_ENV->get_klass_by_name_impl(
90                          this,
91                          construct_array_name(base_element_klass()->name(),
92                                               dimension() - 1),
93                          false);
94    }
95  }
96  return _element_klass;
97}
98
99// ------------------------------------------------------------------
100// ciObjArrayKlass::construct_array_name
101//
102// Build an array name from an element name and a dimension.
103ciSymbol* ciObjArrayKlass::construct_array_name(ciSymbol* element_name,
104                                                int dimension) {
105  EXCEPTION_CONTEXT;
106  int element_len = element_name->utf8_length();
107
108  symbolOop base_name_sym = element_name->get_symbolOop();
109  char* name;
110
111  if (base_name_sym->byte_at(0) == '[' ||
112      (base_name_sym->byte_at(0) == 'L' &&  // watch package name 'Lxx'
113       base_name_sym->byte_at(element_len-1) == ';')) {
114
115    int new_len = element_len + dimension + 1; // for the ['s and '\0'
116    name = CURRENT_THREAD_ENV->name_buffer(new_len);
117
118    int pos = 0;
119    for ( ; pos < dimension; pos++) {
120      name[pos] = '[';
121    }
122    strncpy(name+pos, (char*)element_name->base(), element_len);
123    name[new_len-1] = '\0';
124  } else {
125    int new_len =   3                       // for L, ;, and '\0'
126                  + dimension               // for ['s
127                  + element_len;
128
129    name = CURRENT_THREAD_ENV->name_buffer(new_len);
130    int pos = 0;
131    for ( ; pos < dimension; pos++) {
132      name[pos] = '[';
133    }
134    name[pos++] = 'L';
135    strncpy(name+pos, (char*)element_name->base(), element_len);
136    name[new_len-2] = ';';
137    name[new_len-1] = '\0';
138  }
139  return ciSymbol::make(name);
140}
141
142// ------------------------------------------------------------------
143// ciObjArrayKlass::make_impl
144//
145// Implementation of make.
146ciObjArrayKlass* ciObjArrayKlass::make_impl(ciKlass* element_klass) {
147
148  if (element_klass->is_loaded()) {
149    EXCEPTION_CONTEXT;
150    // The element klass is loaded
151    klassOop array = element_klass->get_Klass()->array_klass(THREAD);
152    if (HAS_PENDING_EXCEPTION) {
153      CLEAR_PENDING_EXCEPTION;
154      CURRENT_THREAD_ENV->record_out_of_memory_failure();
155      return ciEnv::unloaded_ciobjarrayklass();
156    }
157    return CURRENT_THREAD_ENV->get_object(array)->as_obj_array_klass();
158  }
159
160  // The array klass was unable to be made or the element klass was
161  // not loaded.
162  ciSymbol* array_name = construct_array_name(element_klass->name(), 1);
163  if (array_name == ciEnv::unloaded_cisymbol()) {
164    return ciEnv::unloaded_ciobjarrayklass();
165  }
166  return
167    CURRENT_ENV->get_unloaded_klass(element_klass, array_name)
168                        ->as_obj_array_klass();
169}
170
171// ------------------------------------------------------------------
172// ciObjArrayKlass::make
173//
174// Make an array klass corresponding to the specified primitive type.
175ciObjArrayKlass* ciObjArrayKlass::make(ciKlass* element_klass) {
176  assert(element_klass->is_java_klass(), "wrong kind of klass");
177  GUARDED_VM_ENTRY(return make_impl(element_klass);)
178}
179