Mercurial > hg > graal-compiler

annotate src/share/vm/ci/ciInstanceKlass.cpp @ 1846:d55217dc206f

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6829194: JSR 292 needs to support compressed oops Reviewed-by: kvn, jrose
author twisti
date Mon, 11 Oct 2010 04:18:58 -0700
parents 0e35fa8ebccd
children b0e6879e48fa
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1 /*
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2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_ciInstanceKlass.cpp.incl"
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27
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28 // ciInstanceKlass
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29 //
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30 // This class represents a klassOop in the HotSpot virtual machine
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31 // whose Klass part in an instanceKlass.
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32
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33 // ------------------------------------------------------------------
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34 // ciInstanceKlass::ciInstanceKlass
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35 //
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36 // Loaded instance klass.
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37 ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) :
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38 ciKlass(h_k), _non_static_fields(NULL)
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39 {
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40 assert(get_Klass()->oop_is_instance(), "wrong type");
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41 instanceKlass* ik = get_instanceKlass();
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42
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43 AccessFlags access_flags = ik->access_flags();
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44 _flags = ciFlags(access_flags);
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45 _has_finalizer = access_flags.has_finalizer();
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46 _has_subklass = ik->subklass() != NULL;
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47 _init_state = (instanceKlass::ClassState)ik->get_init_state();
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48 _nonstatic_field_size = ik->nonstatic_field_size();
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49 _has_nonstatic_fields = ik->has_nonstatic_fields();
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50 _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
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51
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52 _nof_implementors = ik->nof_implementors();
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53 for (int i = 0; i < implementors_limit; i++) {
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54 _implementors[i] = NULL; // we will fill these lazily
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55 }
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56
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57 Thread *thread = Thread::current();
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58 if (ciObjectFactory::is_initialized()) {
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59 _loader = JNIHandles::make_local(thread, ik->class_loader());
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60 _protection_domain = JNIHandles::make_local(thread,
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61 ik->protection_domain());
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62 _is_shared = false;
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63 } else {
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64 Handle h_loader(thread, ik->class_loader());
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65 Handle h_protection_domain(thread, ik->protection_domain());
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66 _loader = JNIHandles::make_global(h_loader);
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67 _protection_domain = JNIHandles::make_global(h_protection_domain);
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68 _is_shared = true;
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69 }
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70
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71 // Lazy fields get filled in only upon request.
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72 _super = NULL;
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73 _java_mirror = NULL;
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74
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75 if (is_shared()) {
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76 if (h_k() != SystemDictionary::Object_klass()) {
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77 super();
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78 }
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79 java_mirror();
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80 //compute_nonstatic_fields(); // done outside of constructor
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81 }
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82
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83 _field_cache = NULL;
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84 }
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85
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86 // Version for unloaded classes:
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87 ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
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88 jobject loader, jobject protection_domain)
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89 : ciKlass(name, ciInstanceKlassKlass::make())
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90 {
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91 assert(name->byte_at(0) != '[', "not an instance klass");
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92 _init_state = (instanceKlass::ClassState)0;
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93 _nonstatic_field_size = -1;
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94 _has_nonstatic_fields = false;
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95 _nonstatic_fields = NULL;
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96 _nof_implementors = -1;
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97 _loader = loader;
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98 _protection_domain = protection_domain;
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99 _is_shared = false;
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100 _super = NULL;
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101 _java_mirror = NULL;
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102 _field_cache = NULL;
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103 }
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104
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105
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106
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107 // ------------------------------------------------------------------
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108 // ciInstanceKlass::compute_shared_is_initialized
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109 void ciInstanceKlass::compute_shared_init_state() {
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110 GUARDED_VM_ENTRY(
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111 instanceKlass* ik = get_instanceKlass();
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112 _init_state = (instanceKlass::ClassState)ik->get_init_state();
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113 )
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114 }
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115
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116 // ------------------------------------------------------------------
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117 // ciInstanceKlass::compute_shared_has_subklass
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118 bool ciInstanceKlass::compute_shared_has_subklass() {
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119 GUARDED_VM_ENTRY(
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120 instanceKlass* ik = get_instanceKlass();
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121 _has_subklass = ik->subklass() != NULL;
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122 return _has_subklass;
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123 )
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124 }
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125
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126 // ------------------------------------------------------------------
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127 // ciInstanceKlass::compute_shared_nof_implementors
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128 int ciInstanceKlass::compute_shared_nof_implementors() {
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129 // We requery this property, since it is a very old ciObject.
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130 GUARDED_VM_ENTRY(
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131 instanceKlass* ik = get_instanceKlass();
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132 _nof_implementors = ik->nof_implementors();
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133 return _nof_implementors;
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134 )
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135 }
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136
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137 // ------------------------------------------------------------------
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138 // ciInstanceKlass::loader
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139 oop ciInstanceKlass::loader() {
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140 ASSERT_IN_VM;
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141 return JNIHandles::resolve(_loader);
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142 }
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143
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144 // ------------------------------------------------------------------
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145 // ciInstanceKlass::loader_handle
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146 jobject ciInstanceKlass::loader_handle() {
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147 return _loader;
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148 }
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149
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150 // ------------------------------------------------------------------
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151 // ciInstanceKlass::protection_domain
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152 oop ciInstanceKlass::protection_domain() {
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153 ASSERT_IN_VM;
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154 return JNIHandles::resolve(_protection_domain);
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155 }
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156
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157 // ------------------------------------------------------------------
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158 // ciInstanceKlass::protection_domain_handle
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159 jobject ciInstanceKlass::protection_domain_handle() {
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160 return _protection_domain;
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161 }
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162
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163 // ------------------------------------------------------------------
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164 // ciInstanceKlass::field_cache
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165 //
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166 // Get the field cache associated with this klass.
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167 ciConstantPoolCache* ciInstanceKlass::field_cache() {
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168 if (is_shared()) {
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169 return NULL;
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170 }
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171 if (_field_cache == NULL) {
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172 assert(!is_java_lang_Object(), "Object has no fields");
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173 Arena* arena = CURRENT_ENV->arena();
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174 _field_cache = new (arena) ciConstantPoolCache(arena, 5);
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175 }
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176 return _field_cache;
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177 }
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178
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179 // ------------------------------------------------------------------
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180 // ciInstanceKlass::get_canonical_holder
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181 //
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182 ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
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183 #ifdef ASSERT
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184 if (!(offset >= 0 && offset < layout_helper())) {
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185 tty->print("*** get_canonical_holder(%d) on ", offset);
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186 this->print();
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187 tty->print_cr(" ***");
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188 };
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189 assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
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190 #endif
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191
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192 if (offset < instanceOopDesc::base_offset_in_bytes()) {
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193 // All header offsets belong properly to java/lang/Object.
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194 return CURRENT_ENV->Object_klass();
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195 }
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196
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197 ciInstanceKlass* self = this;
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198 for (;;) {
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199 assert(self->is_loaded(), "must be loaded to have size");
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200 ciInstanceKlass* super = self->super();
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201 if (super == NULL || super->nof_nonstatic_fields() == 0 ||
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202 !super->contains_field_offset(offset)) {
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203 return self;
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204 } else {
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205 self = super; // return super->get_canonical_holder(offset)
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206 }
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207 }
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208 }
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209
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210 // ------------------------------------------------------------------
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211 // ciInstanceKlass::is_java_lang_Object
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212 //
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213 // Is this klass java.lang.Object?
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214 bool ciInstanceKlass::is_java_lang_Object() {
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215 return equals(CURRENT_ENV->Object_klass());
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216 }
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217
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218 // ------------------------------------------------------------------
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219 // ciInstanceKlass::uses_default_loader
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220 bool ciInstanceKlass::uses_default_loader() {
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221 // Note: We do not need to resolve the handle or enter the VM
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222 // in order to test null-ness.
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223 return _loader == NULL;
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224 }
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225
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226 // ------------------------------------------------------------------
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227 // ciInstanceKlass::is_in_package
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228 //
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229 // Is this klass in the given package?
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230 bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
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231 // To avoid class loader mischief, this test always rejects application classes.
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232 if (!uses_default_loader())
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233 return false;
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234 GUARDED_VM_ENTRY(
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235 return is_in_package_impl(packagename, len);
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236 )
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237 }
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238
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239 bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
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240 ASSERT_IN_VM;
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241
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242 // If packagename contains trailing '/' exclude it from the
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243 // prefix-test since we test for it explicitly.
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244 if (packagename[len - 1] == '/')
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245 len--;
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246
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247 if (!name()->starts_with(packagename, len))
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248 return false;
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249
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250 // Test if the class name is something like "java/lang".
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251 if ((len + 1) > name()->utf8_length())
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252 return false;
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253
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254 // Test for trailing '/'
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255 if ((char) name()->byte_at(len) != '/')
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256 return false;
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257
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258 // Make sure it's not actually in a subpackage:
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259 if (name()->index_of_at(len+1, "/", 1) >= 0)
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260 return false;
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261
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262 return true;
0
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263 }
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264
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265 // ------------------------------------------------------------------
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266 // ciInstanceKlass::print_impl
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267 //
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268 // Implementation of the print method.
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269 void ciInstanceKlass::print_impl(outputStream* st) {
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270 ciKlass::print_impl(st);
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271 GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());)
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272 if (is_loaded()) {
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273 st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
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274 bool_to_str(is_initialized()),
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275 bool_to_str(has_finalizer()),
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276 bool_to_str(has_subklass()),
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277 layout_helper());
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278
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279 _flags.print_klass_flags();
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280
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281 if (_super) {
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282 st->print(" super=");
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283 _super->print_name();
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284 }
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285 if (_java_mirror) {
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286 st->print(" mirror=PRESENT");
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287 }
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288 } else {
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289 st->print(" loaded=false");
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290 }
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291 }
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292
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293 // ------------------------------------------------------------------
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294 // ciInstanceKlass::super
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295 //
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296 // Get the superklass of this klass.
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297 ciInstanceKlass* ciInstanceKlass::super() {
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298 assert(is_loaded(), "must be loaded");
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299 if (_super == NULL && !is_java_lang_Object()) {
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300 GUARDED_VM_ENTRY(
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301 klassOop super_klass = get_instanceKlass()->super();
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302 _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass();
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303 )
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304 }
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305 return _super;
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306 }
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307
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308 // ------------------------------------------------------------------
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309 // ciInstanceKlass::java_mirror
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310 //
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311 // Get the instance of java.lang.Class corresponding to this klass.
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312 // Cache it on this->_java_mirror.
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313 ciInstance* ciInstanceKlass::java_mirror() {
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314 if (_java_mirror == NULL) {
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315 _java_mirror = ciKlass::java_mirror();
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316 }
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317 return _java_mirror;
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318 }
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319
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320 // ------------------------------------------------------------------
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321 // ciInstanceKlass::unique_concrete_subklass
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322 ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
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323 if (!is_loaded()) return NULL; // No change if class is not loaded
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324 if (!is_abstract()) return NULL; // Only applies to abstract classes.
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325 if (!has_subklass()) return NULL; // Must have at least one subklass.
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326 VM_ENTRY_MARK;
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327 instanceKlass* ik = get_instanceKlass();
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328 Klass* up = ik->up_cast_abstract();
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329 assert(up->oop_is_instance(), "must be instanceKlass");
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330 if (ik == up) {
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331 return NULL;
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332 }
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333 return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass();
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334 }
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335
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336 // ------------------------------------------------------------------
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337 // ciInstanceKlass::has_finalizable_subclass
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338 bool ciInstanceKlass::has_finalizable_subclass() {
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339 if (!is_loaded()) return true;
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340 VM_ENTRY_MARK;
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341 return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
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342 }
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343
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344 // ------------------------------------------------------------------
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345 // ciInstanceKlass::get_field_by_offset
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346 ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
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347 if (!is_static) {
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348 for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
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349 ciField* field = _nonstatic_fields->at(i);
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350 int field_off = field->offset_in_bytes();
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351 if (field_off == field_offset)
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352 return field;
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353 if (field_off > field_offset)
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354 break;
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355 // could do binary search or check bins, but probably not worth it
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356 }
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357 return NULL;
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358 }
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359 VM_ENTRY_MARK;
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360 instanceKlass* k = get_instanceKlass();
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361 fieldDescriptor fd;
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362 if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
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363 return NULL;
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364 }
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365 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
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366 return field;
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367 }
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368
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369 // ------------------------------------------------------------------
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370 // ciInstanceKlass::get_field_by_name
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371 ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
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372 VM_ENTRY_MARK;
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373 instanceKlass* k = get_instanceKlass();
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374 fieldDescriptor fd;
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375 klassOop def = k->find_field(name->get_symbolOop(), signature->get_symbolOop(), is_static, &fd);
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parents: 196
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376 if (def == NULL) {
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377 return NULL;
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parents: 196
diff changeset
378 }
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379 ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
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380 return field;
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381 }
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382
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383 // ------------------------------------------------------------------
44
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384 // ciInstanceKlass::non_static_fields.
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385
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386 class NonStaticFieldFiller: public FieldClosure {
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387 GrowableArray<ciField*>* _arr;
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388 ciEnv* _curEnv;
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389 public:
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390 NonStaticFieldFiller(ciEnv* curEnv, GrowableArray<ciField*>* arr) :
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391 _curEnv(curEnv), _arr(arr)
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392 {}
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393 void do_field(fieldDescriptor* fd) {
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394 ciField* field = new (_curEnv->arena()) ciField(fd);
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395 _arr->append(field);
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396 }
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397 };
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398
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399 GrowableArray<ciField*>* ciInstanceKlass::non_static_fields() {
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400 if (_non_static_fields == NULL) {
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401 VM_ENTRY_MARK;
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402 ciEnv* curEnv = ciEnv::current();
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403 instanceKlass* ik = get_instanceKlass();
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404 int max_n_fields = ik->fields()->length()/instanceKlass::next_offset;
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405
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406 Arena* arena = curEnv->arena();
44
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407 _non_static_fields =
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408 new (arena) GrowableArray<ciField*>(arena, max_n_fields, 0, NULL);
44
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409 NonStaticFieldFiller filler(curEnv, _non_static_fields);
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410 ik->do_nonstatic_fields(&filler);
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411 }
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412 return _non_static_fields;
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413 }
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414
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415 static int sort_field_by_offset(ciField** a, ciField** b) {
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416 return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
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417 // (no worries about 32-bit overflow...)
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418 }
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419
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420 // ------------------------------------------------------------------
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421 // ciInstanceKlass::compute_nonstatic_fields
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422 int ciInstanceKlass::compute_nonstatic_fields() {
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423 assert(is_loaded(), "must be loaded");
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424
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425 if (_nonstatic_fields != NULL)
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426 return _nonstatic_fields->length();
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427
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428 if (!has_nonstatic_fields()) {
0
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429 Arena* arena = CURRENT_ENV->arena();
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430 _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
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431 return 0;
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432 }
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433 assert(!is_java_lang_Object(), "bootstrap OK");
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434
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435 // Size in bytes of my fields, including inherited fields.
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436 int fsize = nonstatic_field_size() * heapOopSize;
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437
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438 ciInstanceKlass* super = this->super();
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439 GrowableArray<ciField*>* super_fields = NULL;
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440 if (super != NULL && super->has_nonstatic_fields()) {
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441 int super_fsize = super->nonstatic_field_size() * heapOopSize;
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442 int super_flen = super->nof_nonstatic_fields();
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443 super_fields = super->_nonstatic_fields;
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444 assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
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445 // See if I am no larger than my super; if so, I can use his fields.
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446 if (fsize == super_fsize) {
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447 _nonstatic_fields = super_fields;
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448 return super_fields->length();
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449 }
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450 }
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451
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452 GrowableArray<ciField*>* fields = NULL;
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453 GUARDED_VM_ENTRY({
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454 fields = compute_nonstatic_fields_impl(super_fields);
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455 });
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456
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457 if (fields == NULL) {
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458 // This can happen if this class (java.lang.Class) has invisible fields.
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459 _nonstatic_fields = super_fields;
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460 return super_fields->length();
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461 }
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462
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463 int flen = fields->length();
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464
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465 // Now sort them by offset, ascending.
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466 // (In principle, they could mix with superclass fields.)
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467 fields->sort(sort_field_by_offset);
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468 #ifdef ASSERT
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469 int last_offset = instanceOopDesc::base_offset_in_bytes();
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470 for (int i = 0; i < fields->length(); i++) {
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471 ciField* field = fields->at(i);
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472 int offset = field->offset_in_bytes();
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473 int size = (field->_type == NULL) ? heapOopSize : field->size_in_bytes();
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474 assert(last_offset <= offset, err_msg("no field overlap: %d <= %d", last_offset, offset));
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475 if (last_offset > (int)sizeof(oopDesc))
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476 assert((offset - last_offset) < BytesPerLong, "no big holes");
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477 // Note: Two consecutive T_BYTE fields will be separated by wordSize-1
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478 // padding bytes if one of them is declared by a superclass.
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479 // This is a minor inefficiency classFileParser.cpp.
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480 last_offset = offset + size;
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481 }
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482 assert(last_offset <= (int)instanceOopDesc::base_offset_in_bytes() + fsize, "no overflow");
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483 #endif
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484
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485 _nonstatic_fields = fields;
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486 return flen;
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487 }
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488
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489 GrowableArray<ciField*>*
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490 ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
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491 super_fields) {
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492 ASSERT_IN_VM;
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493 Arena* arena = CURRENT_ENV->arena();
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494 int flen = 0;
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495 GrowableArray<ciField*>* fields = NULL;
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496 instanceKlass* k = get_instanceKlass();
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497 typeArrayOop fields_array = k->fields();
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498 for (int pass = 0; pass <= 1; pass++) {
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499 for (int i = 0, alen = fields_array->length(); i < alen; i += instanceKlass::next_offset) {
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500 fieldDescriptor fd;
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501 fd.initialize(k->as_klassOop(), i);
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502 if (fd.is_static()) continue;
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503 if (pass == 0) {
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504 flen += 1;
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505 } else {
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506 ciField* field = new (arena) ciField(&fd);
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507 fields->append(field);
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508 }
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509 }
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510
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511 // Between passes, allocate the array:
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512 if (pass == 0) {
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513 if (flen == 0) {
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514 return NULL; // return nothing if none are locally declared
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515 }
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516 if (super_fields != NULL) {
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517 flen += super_fields->length();
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518 }
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519 fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
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520 if (super_fields != NULL) {
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521 fields->appendAll(super_fields);
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522 }
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523 }
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524 }
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525 assert(fields->length() == flen, "sanity");
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526 return fields;
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527 }
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528
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529 // ------------------------------------------------------------------
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530 // ciInstanceKlass::find_method
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531 //
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532 // Find a method in this klass.
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533 ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
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534 VM_ENTRY_MARK;
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535 instanceKlass* k = get_instanceKlass();
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536 symbolOop name_sym = name->get_symbolOop();
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537 symbolOop sig_sym= signature->get_symbolOop();
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538
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539 methodOop m = k->find_method(name_sym, sig_sym);
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540 if (m == NULL) return NULL;
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541
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542 return CURRENT_THREAD_ENV->get_object(m)->as_method();
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543 }
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544
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545 // ------------------------------------------------------------------
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546 // ciInstanceKlass::is_leaf_type
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547 bool ciInstanceKlass::is_leaf_type() {
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548 assert(is_loaded(), "must be loaded");
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549 if (is_shared()) {
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550 return is_final(); // approximately correct
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551 } else {
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552 return !_has_subklass && (_nof_implementors == 0);
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553 }
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554 }
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555
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556 // ------------------------------------------------------------------
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557 // ciInstanceKlass::implementor
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558 //
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559 // Report an implementor of this interface.
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560 // Returns NULL if exact information is not available.
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561 // Note that there are various races here, since my copy
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562 // of _nof_implementors might be out of date with respect
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563 // to results returned by instanceKlass::implementor.
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564 // This is OK, since any dependencies we decide to assert
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565 // will be checked later under the Compile_lock.
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566 ciInstanceKlass* ciInstanceKlass::implementor(int n) {
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567 if (n > implementors_limit) {
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568 return NULL;
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569 }
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570 ciInstanceKlass* impl = _implementors[n];
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571 if (impl == NULL) {
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572 if (_nof_implementors > implementors_limit) {
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573 return NULL;
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574 }
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575 // Go into the VM to fetch the implementor.
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576 {
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577 VM_ENTRY_MARK;
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578 klassOop k = get_instanceKlass()->implementor(n);
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579 if (k != NULL) {
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580 impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass();
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581 }
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582 }
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diff changeset
583 // Memoize this result.
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diff changeset
584 if (!is_shared()) {
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585 _implementors[n] = (impl == NULL)? this: impl;
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586 }
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587 } else if (impl == this) {
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588 impl = NULL; // memoized null result from a VM query
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589 }
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590 return impl;
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591 }