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1 /*
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2 * Copyright 1997-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any 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/_nativeLookup.cpp.incl"
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27
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28
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29 static void mangle_name_on(outputStream* st, symbolOop name, int begin, int end) {
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30 char* bytes = (char*)name->bytes() + begin;
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31 char* end_bytes = (char*)name->bytes() + end;
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32 while (bytes < end_bytes) {
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33 jchar c;
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34 bytes = UTF8::next(bytes, &c);
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35 if (c <= 0x7f && isalnum(c)) {
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36 st->put((char) c);
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37 } else {
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38 if (c == '_') st->print("_1");
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39 else if (c == '/') st->print("_");
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40 else if (c == ';') st->print("_2");
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41 else if (c == '[') st->print("_3");
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42 else st->print("_%.5x", c);
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43 }
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44 }
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45 }
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46
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47
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48 static void mangle_name_on(outputStream* st, symbolOop name) {
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49 mangle_name_on(st, name, 0, name->utf8_length());
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50 }
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51
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52
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53 char* NativeLookup::pure_jni_name(methodHandle method) {
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54 stringStream st;
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55 // Prefix
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56 st.print("Java_");
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57 // Klass name
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58 mangle_name_on(&st, method->klass_name());
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59 st.print("_");
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60 // Method name
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61 mangle_name_on(&st, method->name());
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62 return st.as_string();
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63 }
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64
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65
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66 char* NativeLookup::long_jni_name(methodHandle method) {
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67 // Signature ignore the wrapping parenteses and the trailing return type
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68 stringStream st;
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69 symbolOop signature = method->signature();
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70 st.print("__");
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71 // find ')'
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72 int end;
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73 for (end = 0; end < signature->utf8_length() && signature->byte_at(end) != ')'; end++);
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74 // skip first '('
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75 mangle_name_on(&st, signature, 1, end);
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76 return st.as_string();
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77 }
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78
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79 extern "C" {
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80 void JNICALL JVM_RegisterUnsafeMethods(JNIEnv *env, jclass unsafecls);
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81 void JNICALL JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass);
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82 }
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83
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84 static address lookup_special_native(char* jni_name) {
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85 // NB: To ignore the jni prefix and jni postfix strstr is used matching.
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86 if (!JDK_Version::is_gte_jdk14x_version()) {
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87 // These functions only exist for compatibility with 1.3.1 and earlier
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88 // Intercept ObjectOutputStream getPrimitiveFieldValues for faster serialization
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89 if (strstr(jni_name, "Java_java_io_ObjectOutputStream_getPrimitiveFieldValues") != NULL) {
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90 return CAST_FROM_FN_PTR(address, JVM_GetPrimitiveFieldValues);
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91 }
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92 // Intercept ObjectInputStream setPrimitiveFieldValues for faster serialization
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93 if (strstr(jni_name, "Java_java_io_ObjectInputStream_setPrimitiveFieldValues") != NULL) {
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94 return CAST_FROM_FN_PTR(address, JVM_SetPrimitiveFieldValues);
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95 }
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96 }
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97 if (strstr(jni_name, "Java_sun_misc_Unsafe_registerNatives") != NULL) {
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98 return CAST_FROM_FN_PTR(address, JVM_RegisterUnsafeMethods);
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99 }
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100 if (strstr(jni_name, "Java_sun_misc_Perf_registerNatives") != NULL) {
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101 return CAST_FROM_FN_PTR(address, JVM_RegisterPerfMethods);
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102 }
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103
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104 return NULL;
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105 }
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106
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107 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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108 address entry;
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109 // Compute complete JNI name for style
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110 stringStream st;
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111 if (os_style) os::print_jni_name_prefix_on(&st, args_size);
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112 st.print_raw(pure_name);
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113 st.print_raw(long_name);
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114 if (os_style) os::print_jni_name_suffix_on(&st, args_size);
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115 char* jni_name = st.as_string();
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116
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117 // If the loader is null we have a system class, so we attempt a lookup in
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118 // the native Java library. This takes care of any bootstrapping problems.
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119 // Note: It is critical for bootstrapping that Java_java_lang_ClassLoader_00024NativeLibrary_find
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120 // gets found the first time around - otherwise an infinite loop can occure. This is
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121 // another VM/library dependency
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122 Handle loader(THREAD,
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123 instanceKlass::cast(method->method_holder())->class_loader());
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124 if (loader.is_null()) {
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125 entry = lookup_special_native(jni_name);
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126 if (entry == NULL) {
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127 entry = (address) hpi::dll_lookup(os::native_java_library(), jni_name);
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128 }
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129 if (entry != NULL) {
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130 in_base_library = true;
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131 return entry;
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132 }
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133 }
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134
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135 // Otherwise call static method findNative in ClassLoader
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136 KlassHandle klass (THREAD, SystemDictionary::classloader_klass());
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137 Handle name_arg = java_lang_String::create_from_str(jni_name, CHECK_NULL);
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138
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139 JavaValue result(T_LONG);
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140 JavaCalls::call_static(&result,
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141 klass,
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142 vmSymbolHandles::findNative_name(),
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143 vmSymbolHandles::classloader_string_long_signature(),
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144 // Arguments
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145 loader,
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146 name_arg,
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147 CHECK_NULL);
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148 entry = (address) (intptr_t) result.get_jlong();
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149
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150 if (entry == NULL) {
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151 // findNative didn't find it, if there are any agent libraries look in them
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152 AgentLibrary* agent;
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153 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
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154 entry = (address) hpi::dll_lookup(agent->os_lib(), jni_name);
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155 if (entry != NULL) {
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156 return entry;
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157 }
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158 }
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159 }
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160
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161 return entry;
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162 }
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163
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164
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165 // Check all the formats of native implementation name to see if there is one
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166 // for the specified method.
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167 address NativeLookup::lookup_entry(methodHandle method, bool& in_base_library, TRAPS) {
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168 address entry = NULL;
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169 in_base_library = false;
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170 // Compute pure name
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171 char* pure_name = pure_jni_name(method);
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172
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173 // Compute argument size
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174 int args_size = 1 // JNIEnv
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175 + (method->is_static() ? 1 : 0) // class for static methods
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176 + method->size_of_parameters(); // actual parameters
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177
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178
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179 // 1) Try JNI short style
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180 entry = lookup_style(method, pure_name, "", args_size, true, in_base_library, CHECK_NULL);
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181 if (entry != NULL) return entry;
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182
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183 // Compute long name
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184 char* long_name = long_jni_name(method);
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185
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186 // 2) Try JNI long style
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187 entry = lookup_style(method, pure_name, long_name, args_size, true, in_base_library, CHECK_NULL);
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188 if (entry != NULL) return entry;
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189
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190 // 3) Try JNI short style without os prefix/suffix
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191 entry = lookup_style(method, pure_name, "", args_size, false, in_base_library, CHECK_NULL);
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192 if (entry != NULL) return entry;
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193
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194 // 4) Try JNI long style without os prefix/suffix
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195 entry = lookup_style(method, pure_name, long_name, args_size, false, in_base_library, CHECK_NULL);
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196
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197 return entry; // NULL indicates not found
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198 }
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199
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200 // Check if there are any JVM TI prefixes which have been applied to the native method name.
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201 // If any are found, remove them before attemping the look up of the
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202 // native implementation again.
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203 // See SetNativeMethodPrefix in the JVM TI Spec for more details.
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204 address NativeLookup::lookup_entry_prefixed(methodHandle method, bool& in_base_library, TRAPS) {
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205 ResourceMark rm(THREAD);
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206
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207 int prefix_count;
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208 char** prefixes = JvmtiExport::get_all_native_method_prefixes(&prefix_count);
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209 char* in_name = method->name()->as_C_string();
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210 char* wrapper_name = in_name;
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211 // last applied prefix will be first -- go backwards
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212 for (int i = prefix_count-1; i >= 0; i--) {
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213 char* prefix = prefixes[i];
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214 size_t prefix_len = strlen(prefix);
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215 if (strncmp(prefix, wrapper_name, prefix_len) == 0) {
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216 // has this prefix remove it
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217 wrapper_name += prefix_len;
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218 }
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219 }
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220 if (wrapper_name != in_name) {
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221 // we have a name for a wrapping method
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222 int wrapper_name_len = (int)strlen(wrapper_name);
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223 symbolHandle wrapper_symbol(THREAD, SymbolTable::probe(wrapper_name, wrapper_name_len));
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224 if (!wrapper_symbol.is_null()) {
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225 KlassHandle kh(method->method_holder());
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226 methodOop wrapper_method = Klass::cast(kh())->lookup_method(wrapper_symbol(),
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227 method->signature());
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228 if (wrapper_method != NULL && !wrapper_method->is_native()) {
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229 // we found a wrapper method, use its native entry
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230 method->set_is_prefixed_native();
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231 return lookup_entry(wrapper_method, in_base_library, THREAD);
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232 }
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233 }
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234 }
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235 return NULL;
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236 }
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237
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238 address NativeLookup::lookup_base(methodHandle method, bool& in_base_library, TRAPS) {
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239 address entry = NULL;
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240 ResourceMark rm(THREAD);
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241
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242 entry = lookup_entry(method, in_base_library, THREAD);
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243 if (entry != NULL) return entry;
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244
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245 // standard native method resolution has failed. Check if there are any
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246 // JVM TI prefixes which have been applied to the native method name.
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247 entry = lookup_entry_prefixed(method, in_base_library, THREAD);
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248 if (entry != NULL) return entry;
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249
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250 // Native function not found, throw UnsatisfiedLinkError
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251 THROW_MSG_0(vmSymbols::java_lang_UnsatisfiedLinkError(),
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252 method->name_and_sig_as_C_string());
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253 }
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254
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255
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256 address NativeLookup::lookup(methodHandle method, bool& in_base_library, TRAPS) {
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257 if (!method->has_native_function()) {
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258 address entry = lookup_base(method, in_base_library, CHECK_NULL);
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259 method->set_native_function(entry,
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260 methodOopDesc::native_bind_event_is_interesting);
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261 // -verbose:jni printing
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262 if (PrintJNIResolving) {
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263 ResourceMark rm(THREAD);
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264 tty->print_cr("[Dynamic-linking native method %s.%s ... JNI]",
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265 Klass::cast(method->method_holder())->external_name(),
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266 method->name()->as_C_string());
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267 }
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268 }
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269 return method->native_function();
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270 }
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271
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272 address NativeLookup::base_library_lookup(const char* class_name, const char* method_name, const char* signature) {
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273 EXCEPTION_MARK;
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274 bool in_base_library = true; // SharedRuntime inits some math methods.
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275 symbolHandle c_name = oopFactory::new_symbol_handle(class_name, CATCH);
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276 symbolHandle m_name = oopFactory::new_symbol_handle(method_name, CATCH);
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277 symbolHandle s_name = oopFactory::new_symbol_handle(signature, CATCH);
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278
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279 // Find the class
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280 klassOop k = SystemDictionary::resolve_or_fail(c_name, true, CATCH);
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281 instanceKlassHandle klass (THREAD, k);
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282
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283 // Find method and invoke standard lookup
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284 methodHandle method (THREAD,
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285 klass->uncached_lookup_method(m_name(), s_name()));
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286 address result = lookup(method, in_base_library, CATCH);
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287 assert(in_base_library, "must be in basic library");
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288 guarantee(result != NULL, "must be non NULL");
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289 return result;
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290 }
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