annotate src/share/vm/prims/nativeLookup.cpp @ 17795:a9becfeecd1b

Merge
author kvn
date Wed, 22 Jan 2014 17:42:23 -0800
parents 55fb97c4c58d 2b8e28fdf503
children d8041d695d19 386dd1c71858
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1 /*
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2 * Copyright (c) 1997, 2013, 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 "precompiled.hpp"
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26 #include "classfile/javaClasses.hpp"
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27 #include "classfile/systemDictionary.hpp"
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28 #include "classfile/vmSymbols.hpp"
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29 #include "memory/oopFactory.hpp"
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30 #include "memory/resourceArea.hpp"
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31 #include "memory/universe.inline.hpp"
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32 #include "oops/instanceKlass.hpp"
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33 #include "oops/method.hpp"
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34 #include "oops/oop.inline.hpp"
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35 #include "oops/symbol.hpp"
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36 #include "prims/jvm_misc.hpp"
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37 #include "prims/nativeLookup.hpp"
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38 #include "runtime/arguments.hpp"
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39 #include "runtime/handles.inline.hpp"
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40 #include "runtime/javaCalls.hpp"
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41 #include "runtime/sharedRuntime.hpp"
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42 #include "runtime/signature.hpp"
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43 #include "utilities/macros.hpp"
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44 #ifdef TARGET_OS_FAMILY_linux
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45 # include "os_linux.inline.hpp"
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46 #endif
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47 #ifdef TARGET_OS_FAMILY_solaris
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48 # include "os_solaris.inline.hpp"
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49 #endif
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50 #ifdef TARGET_OS_FAMILY_windows
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51 # include "os_windows.inline.hpp"
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52 #endif
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53 #ifdef TARGET_OS_FAMILY_aix
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54 # include "os_aix.inline.hpp"
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55 #endif
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56 #ifdef TARGET_OS_FAMILY_bsd
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57 # include "os_bsd.inline.hpp"
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58 #endif
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61 static void mangle_name_on(outputStream* st, Symbol* name, int begin, int end) {
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62 char* bytes = (char*)name->bytes() + begin;
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63 char* end_bytes = (char*)name->bytes() + end;
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64 while (bytes < end_bytes) {
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65 jchar c;
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66 bytes = UTF8::next(bytes, &c);
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67 if (c <= 0x7f && isalnum(c)) {
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68 st->put((char) c);
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69 } else {
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70 if (c == '_') st->print("_1");
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71 else if (c == '/') st->print("_");
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72 else if (c == ';') st->print("_2");
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73 else if (c == '[') st->print("_3");
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74 else st->print("_%.5x", c);
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75 }
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76 }
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77 }
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78
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79
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80 static void mangle_name_on(outputStream* st, Symbol* name) {
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81 mangle_name_on(st, name, 0, name->utf8_length());
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82 }
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83
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84
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85 char* NativeLookup::pure_jni_name(methodHandle method) {
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86 stringStream st;
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87 // Prefix
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88 st.print("Java_");
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89 // Klass name
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90 mangle_name_on(&st, method->klass_name());
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91 st.print("_");
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92 // Method name
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93 mangle_name_on(&st, method->name());
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94 return st.as_string();
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95 }
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97
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98 char* NativeLookup::critical_jni_name(methodHandle method) {
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99 stringStream st;
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100 // Prefix
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101 st.print("JavaCritical_");
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102 // Klass name
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103 mangle_name_on(&st, method->klass_name());
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104 st.print("_");
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105 // Method name
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106 mangle_name_on(&st, method->name());
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107 return st.as_string();
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108 }
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109
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110
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111 char* NativeLookup::long_jni_name(methodHandle method) {
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112 // Signature ignore the wrapping parenteses and the trailing return type
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113 stringStream st;
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114 Symbol* signature = method->signature();
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115 st.print("__");
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116 // find ')'
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117 int end;
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118 for (end = 0; end < signature->utf8_length() && signature->byte_at(end) != ')'; end++);
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119 // skip first '('
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120 mangle_name_on(&st, signature, 1, end);
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121 return st.as_string();
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122 }
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123
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124 extern "C" {
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125 void JNICALL JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls);
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126 void JNICALL JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass unsafecls);
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127 void JNICALL JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass);
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128 void JNICALL JVM_RegisterWhiteBoxMethods(JNIEnv *env, jclass wbclass);
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129 }
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130
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131 #define CC (char*) /* cast a literal from (const char*) */
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132 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
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133
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134 static JNINativeMethod lookup_special_native_methods[] = {
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135 { CC"Java_sun_misc_Unsafe_registerNatives", NULL, FN_PTR(JVM_RegisterUnsafeMethods) },
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136 { CC"Java_java_lang_invoke_MethodHandleNatives_registerNatives", NULL, FN_PTR(JVM_RegisterMethodHandleMethods) },
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137 { CC"Java_sun_misc_Perf_registerNatives", NULL, FN_PTR(JVM_RegisterPerfMethods) },
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138 { CC"Java_sun_hotspot_WhiteBox_registerNatives", NULL, FN_PTR(JVM_RegisterWhiteBoxMethods) },
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139 };
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140
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141 static address lookup_special_native(char* jni_name) {
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142 int count = sizeof(lookup_special_native_methods) / sizeof(JNINativeMethod);
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143 for (int i = 0; i < count; i++) {
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144 // NB: To ignore the jni prefix and jni postfix strstr is used matching.
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145 if (strstr(jni_name, lookup_special_native_methods[i].name) != NULL) {
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146 return CAST_FROM_FN_PTR(address, lookup_special_native_methods[i].fnPtr);
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147 }
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148 }
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149 return NULL;
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150 }
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151
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152 address NativeLookup::lookup_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style, bool& in_base_library, TRAPS) {
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153 address entry;
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154 // Compute complete JNI name for style
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155 stringStream st;
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156 if (os_style) os::print_jni_name_prefix_on(&st, args_size);
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157 st.print_raw(pure_name);
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158 st.print_raw(long_name);
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159 if (os_style) os::print_jni_name_suffix_on(&st, args_size);
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160 char* jni_name = st.as_string();
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161
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162 // If the loader is null we have a system class, so we attempt a lookup in
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163 // the native Java library. This takes care of any bootstrapping problems.
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164 // Note: It is critical for bootstrapping that Java_java_lang_ClassLoader_00024NativeLibrary_find
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165 // gets found the first time around - otherwise an infinite loop can occure. This is
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166 // another VM/library dependency
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167 Handle loader(THREAD, method->method_holder()->class_loader());
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168 if (loader.is_null()) {
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169 entry = lookup_special_native(jni_name);
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170 if (entry == NULL) {
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171 entry = (address) os::dll_lookup(os::native_java_library(), jni_name);
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172 }
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173 if (entry != NULL) {
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174 in_base_library = true;
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175 return entry;
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176 }
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177 }
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178
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179 // Otherwise call static method findNative in ClassLoader
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180 KlassHandle klass (THREAD, SystemDictionary::ClassLoader_klass());
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181 Handle name_arg = java_lang_String::create_from_str(jni_name, CHECK_NULL);
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182
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183 JavaValue result(T_LONG);
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184 JavaCalls::call_static(&result,
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185 klass,
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186 vmSymbols::findNative_name(),
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187 vmSymbols::classloader_string_long_signature(),
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188 // Arguments
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189 loader,
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190 name_arg,
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191 CHECK_NULL);
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192 entry = (address) (intptr_t) result.get_jlong();
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193
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194 if (entry == NULL) {
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195 // findNative didn't find it, if there are any agent libraries look in them
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196 AgentLibrary* agent;
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197 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
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198 entry = (address) os::dll_lookup(agent->os_lib(), jni_name);
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199 if (entry != NULL) {
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200 return entry;
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201 }
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202 }
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203 }
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204
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205 return entry;
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206 }
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207
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208
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209 address NativeLookup::lookup_critical_style(methodHandle method, char* pure_name, const char* long_name, int args_size, bool os_style) {
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210 if (!method->has_native_function()) {
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211 return NULL;
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212 }
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213
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214 address current_entry = method->native_function();
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215
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216 char dll_name[JVM_MAXPATHLEN];
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217 int offset;
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218 if (os::dll_address_to_library_name(current_entry, dll_name, sizeof(dll_name), &offset)) {
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219 char ebuf[32];
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220 void* dll = os::dll_load(dll_name, ebuf, sizeof(ebuf));
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221 if (dll != NULL) {
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222 // Compute complete JNI name for style
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223 stringStream st;
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224 if (os_style) os::print_jni_name_prefix_on(&st, args_size);
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225 st.print_raw(pure_name);
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226 st.print_raw(long_name);
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227 if (os_style) os::print_jni_name_suffix_on(&st, args_size);
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228 char* jni_name = st.as_string();
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229 return (address)os::dll_lookup(dll, jni_name);
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230 }
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231 }
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232
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233 return NULL;
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234 }
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235
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236
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237 // Check all the formats of native implementation name to see if there is one
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238 // for the specified method.
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239 address NativeLookup::lookup_entry(methodHandle method, bool& in_base_library, TRAPS) {
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240 address entry = NULL;
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241 in_base_library = false;
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242 // Compute pure name
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243 char* pure_name = pure_jni_name(method);
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244
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245 // Compute argument size
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246 int args_size = 1 // JNIEnv
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247 + (method->is_static() ? 1 : 0) // class for static methods
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248 + method->size_of_parameters(); // actual parameters
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249
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250
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251 // 1) Try JNI short style
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252 entry = lookup_style(method, pure_name, "", args_size, true, in_base_library, CHECK_NULL);
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253 if (entry != NULL) return entry;
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254
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255 // Compute long name
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256 char* long_name = long_jni_name(method);
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257
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258 // 2) Try JNI long style
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259 entry = lookup_style(method, pure_name, long_name, args_size, true, in_base_library, CHECK_NULL);
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260 if (entry != NULL) return entry;
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261
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262 // 3) Try JNI short style without os prefix/suffix
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263 entry = lookup_style(method, pure_name, "", args_size, false, in_base_library, CHECK_NULL);
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264 if (entry != NULL) return entry;
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265
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266 // 4) Try JNI long style without os prefix/suffix
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267 entry = lookup_style(method, pure_name, long_name, args_size, false, in_base_library, CHECK_NULL);
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268
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269 return entry; // NULL indicates not found
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270 }
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271
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272 // Check all the formats of native implementation name to see if there is one
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273 // for the specified method.
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274 address NativeLookup::lookup_critical_entry(methodHandle method) {
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275 if (!CriticalJNINatives) return NULL;
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276
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277 if (method->is_synchronized() ||
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278 !method->is_static()) {
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279 // Only static non-synchronized methods are allowed
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280 return NULL;
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281 }
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282
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283 ResourceMark rm;
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284 address entry = NULL;
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285
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286 Symbol* signature = method->signature();
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287 for (int end = 0; end < signature->utf8_length(); end++) {
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288 if (signature->byte_at(end) == 'L') {
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289 // Don't allow object types
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290 return NULL;
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291 }
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292 }
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293
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294 // Compute critical name
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295 char* critical_name = critical_jni_name(method);
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296
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297 // Compute argument size
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298 int args_size = 1 // JNIEnv
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299 + (method->is_static() ? 1 : 0) // class for static methods
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300 + method->size_of_parameters(); // actual parameters
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301
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302
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303 // 1) Try JNI short style
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304 entry = lookup_critical_style(method, critical_name, "", args_size, true);
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305 if (entry != NULL) return entry;
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306
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307 // Compute long name
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308 char* long_name = long_jni_name(method);
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309
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310 // 2) Try JNI long style
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311 entry = lookup_critical_style(method, critical_name, long_name, args_size, true);
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312 if (entry != NULL) return entry;
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313
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314 // 3) Try JNI short style without os prefix/suffix
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315 entry = lookup_critical_style(method, critical_name, "", args_size, false);
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316 if (entry != NULL) return entry;
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317
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318 // 4) Try JNI long style without os prefix/suffix
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319 entry = lookup_critical_style(method, critical_name, long_name, args_size, false);
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320
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321 return entry; // NULL indicates not found
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322 }
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323
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324 // Check if there are any JVM TI prefixes which have been applied to the native method name.
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325 // If any are found, remove them before attemping the look up of the
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326 // native implementation again.
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327 // See SetNativeMethodPrefix in the JVM TI Spec for more details.
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328 address NativeLookup::lookup_entry_prefixed(methodHandle method, bool& in_base_library, TRAPS) {
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329 #if INCLUDE_JVMTI
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330 ResourceMark rm(THREAD);
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331
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332 int prefix_count;
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333 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
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334 char* in_name = method->name()->as_C_string();
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335 char* wrapper_name = in_name;
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336 // last applied prefix will be first -- go backwards
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337 for (int i = prefix_count-1; i >= 0; i--) {
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338 char* prefix = prefixes[i];
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339 size_t prefix_len = strlen(prefix);
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340 if (strncmp(prefix, wrapper_name, prefix_len) == 0) {
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341 // has this prefix remove it
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342 wrapper_name += prefix_len;
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343 }
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344 }
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345 if (wrapper_name != in_name) {
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346 // we have a name for a wrapping method
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347 int wrapper_name_len = (int)strlen(wrapper_name);
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348 TempNewSymbol wrapper_symbol = SymbolTable::probe(wrapper_name, wrapper_name_len);
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349 if (wrapper_symbol != NULL) {
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350 KlassHandle kh(method->method_holder());
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351 Method* wrapper_method = kh()->lookup_method(wrapper_symbol,
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352 method->signature());
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353 if (wrapper_method != NULL && !wrapper_method->is_native()) {
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354 // we found a wrapper method, use its native entry
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355 method->set_is_prefixed_native();
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356 return lookup_entry(wrapper_method, in_base_library, THREAD);
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357 }
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358 }
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359 }
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360 #endif // INCLUDE_JVMTI
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361 return NULL;
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362 }
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363
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364 address NativeLookup::lookup_base(methodHandle method, bool& in_base_library, TRAPS) {
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365 address entry = NULL;
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366 ResourceMark rm(THREAD);
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367
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368 entry = lookup_entry(method, in_base_library, THREAD);
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369 if (entry != NULL) return entry;
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370
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371 // standard native method resolution has failed. Check if there are any
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372 // JVM TI prefixes which have been applied to the native method name.
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373 entry = lookup_entry_prefixed(method, in_base_library, THREAD);
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374 if (entry != NULL) return entry;
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375
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376 // Native function not found, throw UnsatisfiedLinkError
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377 THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(),
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378 method->name_and_sig_as_C_string());
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379 }
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380
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381
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382 address NativeLookup::lookup(methodHandle method, bool& in_base_library, TRAPS) {
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383 if (!method->has_native_function()) {
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384 address entry = lookup_base(method, in_base_library, CHECK_NULL);
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385 method->set_native_function(entry,
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386 Method::native_bind_event_is_interesting);
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387 // -verbose:jni printing
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388 if (PrintJNIResolving) {
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389 ResourceMark rm(THREAD);
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390 tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]",
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391 method->method_holder()->external_name(),
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392 method->name()->as_C_string());
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393 }
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394 }
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395 return method->native_function();
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396 }
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397
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398 address NativeLookup::base_library_lookup(const char* class_name, const char* method_name, const char* signature) {
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399 EXCEPTION_MARK;
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400 bool in_base_library = true; // SharedRuntime inits some math methods.
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401 TempNewSymbol c_name = SymbolTable::new_symbol(class_name, CATCH);
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402 TempNewSymbol m_name = SymbolTable::new_symbol(method_name, CATCH);
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403 TempNewSymbol s_name = SymbolTable::new_symbol(signature, CATCH);
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404
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405 // Find the class
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406 Klass* k = SystemDictionary::resolve_or_fail(c_name, true, CATCH);
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407 instanceKlassHandle klass (THREAD, k);
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408
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409 // Find method and invoke standard lookup
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410 methodHandle method (THREAD,
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411 klass->uncached_lookup_method(m_name, s_name));
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412 address result = lookup(method, in_base_library, CATCH);
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413 assert(in_base_library, "must be in basic library");
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414 guarantee(result != NULL, "must be non NULL");
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415 return result;
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416 }