author | jiangli |
Fri, 02 Nov 2018 19:30:31 -0400 (2018-11-02) | |
changeset 52397 | 1322829d1501 |
parent 50260 | 46c67f5e27c2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package nsk.jvmti.SetNativeMethodPrefix; |
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import java.io.*; |
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import nsk.share.Consts; |
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|
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/* ============================================================================== */ |
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/* Quote from JVMTI specification v.1.1.102: |
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* |
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* Since native methods cannot be directly instrumented (they have no |
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* bytecodes), they must be wrapped with a non-native method which can be |
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* instrumented. For example, if we had: |
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* native boolean foo(int x); |
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* |
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* We could transform the class file (with the ClassFileLoadHook event) so |
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* that this becomes: |
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* boolean foo(int x) { |
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* ... record entry to foo ... |
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* return wrapped_foo(x); |
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* } |
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* |
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* native boolean wrapped_foo(int x); |
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* |
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* Where foo becomes a wrapper for the actual native method with the appended |
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* prefix "wrapped_". |
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* |
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* The wrapper will allow data to be collected on the native method call, but |
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* now the problem becomes linking up the wrapped method with the native |
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* implementation. That is, the method wrapped_foo needs to be resolved to the |
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* native implementation of foo, which might be: |
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* |
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* Java_somePackage_someClass_foo(JNIEnv* env, jint x) |
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* |
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* This function allows the prefix to be specified and the proper resolution |
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* to occur. Specifically, when the standard resolution fails, the resolution |
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* is retried taking the prefix into consideration. There are two ways that |
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* resolution occurs, explicit resolution with the JNI function |
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* RegisterNatives and the normal automatic resolution. For RegisterNatives, |
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* the VM will attempt this association: |
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* |
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* method(foo) -> nativeImplementation(foo) |
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* |
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* When this fails, the resolution will be retried with the specified prefix |
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* prepended to the method name, yielding the correct resolution: |
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* |
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* method(wrapped_foo) -> nativeImplementation(foo) |
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* |
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* For automatic resolution, the VM will attempt: |
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* |
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* method(wrapped_foo) -> nativeImplementation(wrapped_foo) |
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* |
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* When this fails, the resolution will be retried with the specified prefix |
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* deleted from the implementation name, yielding the correct resolution: |
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* |
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* method(wrapped_foo) -> nativeImplementation(foo) |
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* |
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* Note that since the prefix is only used when standard resolution fails, |
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* native methods can be wrapped selectively. |
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*/ |
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/* ============================================================================== */ |
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/* ======================================================= */ |
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// Auxiliary classes for explicit method resolution |
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/* ======================================================= */ |
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class ExplicitResolution1 { |
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static public int foo() { return wrapped_foo(); } |
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native static public int wrapped_foo(); |
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} |
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/* ======================================================= */ |
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class ExplicitResolution2 { |
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native static public int wrapped_foo(); |
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} |
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/* ======================================================= */ |
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// Auxiliary classes for automatic resolution |
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/* ======================================================= */ |
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class AutomaticResolution1 { |
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static public int foo() { return wrapped_foo(); } |
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native static public int wrapped_foo(); |
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} |
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/* ======================================================= */ |
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class AutomaticResolution2 { |
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static public int foo() { return wrapped_foo(); } |
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native static public int wrapped_foo(); |
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} |
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/* ======================================================= */ |
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class AutomaticResolution3 { |
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static public int foo() { return wrapped_foo(); } |
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native static public int wrapped_foo(); |
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} |
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/* ======================================================= */ |
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public class SetNativeMethodPrefix001 { |
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PrintStream out = System.out; |
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static public final String prefix = "wrapped_"; |
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/* ============================================================ */ |
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// |
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// For RegisterNatives, the VM will attempt this association: |
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// |
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// method(foo) -> nativeImplementation(foo) |
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// |
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// When this fails, the resolution will be retried with the specified |
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// prefix prepended to the method name, yielding the correct resolution: |
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// |
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// method(wrapped_foo) -> nativeImplementation(foo) |
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// |
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// The prefix is only used when standard resolution fails. |
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135 |
// |
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136 |
/* ============================================================ */ |
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public boolean checkExplicitResolution1(boolean isPrefixSet) { |
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138 |
|
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// Initiate class A loading and initialization |
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140 |
// See CR 6493522 for details |
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141 |
new ExplicitResolution1(); |
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142 |
|
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// Bind ExplicitResolution1.foo() to a native function. |
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// If the prefix isn't set, this code should fail since ExplicitResolution1.foo() isn't native. |
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if (Binder.registerMethod(ExplicitResolution1.class, "foo", "()I", Binder.FUNCTION_FOO) != isPrefixSet) |
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146 |
{ |
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out.println("ERROR: unexpected RegisterNatives() behavior."); |
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return false; |
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149 |
} |
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150 |
|
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151 |
if (isPrefixSet) { |
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if (ExplicitResolution1.foo() != Binder.FOO_RETURN) { |
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out.println("ERROR: native method wrapped_foo() wasn't correctly bound."); |
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return false; |
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155 |
} |
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156 |
} |
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157 |
|
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158 |
// Bind ExplicitResolution1.wrapped_foo() to a native fucntion. |
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// This code should succeed since ExplicitResolution1.wrapped_foo() is native. |
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if (!Binder.registerMethod(ExplicitResolution1.class, "wrapped_foo", "()I", Binder.FUNCTION_WRAPPED_FOO)) |
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161 |
{ |
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out.println("ERROR: RegisterNative() failed for native method ExplicitResolution1.wrapped_foo()."); |
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return false; |
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164 |
} |
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165 |
|
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if (ExplicitResolution1.foo() != Binder.WRAPPED_FOO_RETURN) { |
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out.println("ERROR: native method wrapped_foo() wasn't correctly bound."); |
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return false; |
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169 |
} |
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return true; |
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171 |
} |
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172 |
|
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173 |
/* ============================================================ */ |
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public boolean checkExplicitResolution2() { |
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// Initiate class ExplicitResolution2 loading and initialization |
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176 |
// See CR 6493522 for details |
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new ExplicitResolution2(); |
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178 |
|
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// This binding should fail whether the prefix is set or not since: |
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// - there's no Java_nsk_jvmti_SetNativeMethodPrefix_ExplicitResolution2_wrapped_1foo defined |
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// - class ExplicitResolution2 doesn't have java method foo() |
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if (Binder.registerMethod(ExplicitResolution2.class, "foo", "()I", Binder.FUNCTION_WRAPPED_FOO)) { |
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out.println("ERROR: unexpected RegisterNatives() behavior."); |
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184 |
return false; |
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185 |
} |
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186 |
|
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187 |
return true; |
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188 |
} |
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189 |
|
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190 |
/* ============================================================ */ |
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191 |
public boolean checkExplicitResolution (boolean isMultiplePrefixes) { |
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192 |
// Setting method prefix |
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out.println("\tSetting prefix: "+prefix); |
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194 |
if (isMultiplePrefixes) { |
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if (!Binder.setMultiplePrefixes(prefix)) { return false; } |
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196 |
} else { |
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if (!Binder.setMethodPrefix(prefix)) { return false; } |
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198 |
} |
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199 |
|
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200 |
// Check the behavior |
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201 |
out.println("\t\tChecking resolution for ExplicitResolution1"); |
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202 |
if (!checkExplicitResolution1(true)) { return false; } |
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203 |
out.println("\t\tChecking resolution for ExplicitResolution2"); |
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204 |
if (!checkExplicitResolution2()) { return false; } |
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205 |
|
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206 |
// Resetting method prefix |
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207 |
out.println("\tResetting prefix"); |
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208 |
if (isMultiplePrefixes) { |
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209 |
if (!Binder.setMultiplePrefixes(null)) { return false; } |
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210 |
} else { |
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211 |
if (!Binder.setMethodPrefix(null)) { return false; } |
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212 |
} |
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213 |
|
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214 |
// Check the behavior |
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215 |
out.println("\t\tChecking resolution for ExplicitResolution1"); |
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216 |
if (!checkExplicitResolution1(false)) { return false; } |
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217 |
out.println("\t\tChecking resolution for ExplicitResolution2"); |
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if (!checkExplicitResolution2()) { return false; } |
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219 |
|
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220 |
return true; |
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221 |
} |
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222 |
|
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223 |
/* ============================================================ */ |
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224 |
// For automatic resolution, the VM will attempt: |
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225 |
// |
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226 |
// method(wrapped_foo) -> nativeImplementation(wrapped_foo) |
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227 |
// |
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228 |
// When this fails, the resolution will be retried with the specified |
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229 |
// prefix deleted from the implementation name, yielding the correct |
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230 |
// resolution: |
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231 |
// |
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// method(wrapped_foo) -> nativeImplementation(foo) |
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233 |
// |
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234 |
// The prefix is only used when standard resolution fails. |
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235 |
/* ============================================================ */ |
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236 |
public boolean checkAutomaticResolution1() { |
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237 |
if (AutomaticResolution1.foo() != Binder.WRAPPED_FOO_RETURN) { |
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out.println("ERROR: native method AutomaticResolution1.wrapped_foo() wasn't correctly bound."); |
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239 |
return false; |
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240 |
} |
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241 |
|
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242 |
return true; |
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243 |
} |
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244 |
|
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245 |
/* ============================================================ */ |
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public boolean checkAutomaticResolution2 (boolean isPrefixSet) { |
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if (isPrefixSet) { |
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if (AutomaticResolution2.foo() != Binder.FOO_RETURN) { |
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out.println("ERROR: native method AutomaticResolution2.wrapped_foo() wasn't correctly bound."); |
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return false; |
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} |
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} else { |
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try { |
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AutomaticResolution3.foo(); |
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out.println("ERROR: native method AutomaticResolution3.wrapped_foo() was bound."); |
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return false; |
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} catch (UnsatisfiedLinkError e) { |
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out.println(String.format("The method isn't bound: %s %s\n", e.getClass().getName(), e.getMessage())); |
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return true; |
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} |
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} |
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|
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return true; |
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} |
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|
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/* ============================================================ */ |
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public boolean checkAutomaticResolution (boolean isMultiplePrefixes) { |
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// Setting method prefix |
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out.println("\tSetting prefix: "+prefix); |
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if (isMultiplePrefixes) { |
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if (!Binder.setMultiplePrefixes(prefix)) { return false; } |
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} else { |
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if (!Binder.setMethodPrefix(prefix)) { return false; } |
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} |
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|
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// Check the behavior |
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out.println("\t\tChecking resolution for AutomaticResolution1"); |
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if (!checkAutomaticResolution1()) { return false; } |
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out.println("\t\tChecking resolution for AutomaticResolution2"); |
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if (!checkAutomaticResolution2(true)) { return false; } |
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281 |
|
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// Resetting method prefix |
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out.println("\tResetting prefix"); |
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if (isMultiplePrefixes) { |
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if (!Binder.setMultiplePrefixes(null)) { return false; } |
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} else { |
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if (!Binder.setMethodPrefix(null)) { return false; } |
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} |
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289 |
|
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// Check the behavior |
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out.println("\t\tChecking resolution for AutomaticResolution1"); |
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if (!checkAutomaticResolution1()) { return false; } |
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out.println("\t\tChecking resolution for AutomaticResolution2"); |
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if (!checkAutomaticResolution2(false)) { return false; } |
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295 |
|
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return true; |
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297 |
} |
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298 |
|
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/* ============================================================ */ |
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public boolean runIt(String [] args, PrintStream _out) { |
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if (_out != null) { |
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out = _out; |
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303 |
} |
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304 |
|
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out.println("\nAutomatic resolution; SetMethodPrefix is used"); |
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if (!checkAutomaticResolution(true)) { return false; } |
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307 |
|
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out.println("\nAutomatic resolution; SetMultiplePrefixes is used"); |
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if (!checkAutomaticResolution(false)) { return false; } |
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310 |
|
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out.println("\nExplicit resolution; SetMethodPrefix is used"); |
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if (!checkExplicitResolution(true)) { return false; } |
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313 |
|
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out.println("\nExplicit resolution; SetMultiplePrefixes is used"); |
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315 |
if (!checkExplicitResolution(false)) { return false; } |
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316 |
|
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317 |
|
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318 |
return true; |
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319 |
} |
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320 |
|
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321 |
/* ============================================================ */ |
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322 |
public static int run(String argv[], PrintStream out) { |
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323 |
if ((new SetNativeMethodPrefix001()).runIt(argv, out)) { |
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324 |
out.println("TEST PASSED"); |
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325 |
return Consts.TEST_PASSED; |
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326 |
} else { |
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327 |
out.println("TEST FAILED"); |
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328 |
return Consts.TEST_FAILED; |
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329 |
} |
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330 |
} |
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331 |
|
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332 |
/* ============================================================ */ |
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333 |
public static void main(String[] argv) { |
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334 |
argv = nsk.share.jvmti.JVMTITest.commonInit(argv); |
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335 |
|
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System.exit(run(argv, System.out) + Consts.JCK_STATUS_BASE); |
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337 |
} |
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338 |
} |