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/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @bug 8143214
* @summary Verify StackWalker works well when embedded in another
* StackWalker's functions.
* @run testng/othervm EmbeddedStackWalkTest
*/
import java.lang.StackWalker.StackFrame;
import static java.lang.StackWalker.Option.*;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.Arrays;
import java.util.EnumSet;
import org.testng.annotations.*;
import static org.testng.Assert.*;
public class EmbeddedStackWalkTest {
static final StackWalker WALKERS[] = new StackWalker[] {
StackWalker.getInstance(RETAIN_CLASS_REFERENCE),
StackWalker.getInstance(EnumSet.of(SHOW_REFLECT_FRAMES, RETAIN_CLASS_REFERENCE)),
StackWalker.getInstance(EnumSet.of(SHOW_HIDDEN_FRAMES, RETAIN_CLASS_REFERENCE))
};
static final int BIG_LOOP = 30;
static final int SMALL_LOOP = 5;
@DataProvider
public StackWalker[][] walkerProvider() {
return new StackWalker[][] {
new StackWalker[] { WALKERS[0] },
new StackWalker[] { WALKERS[1] },
new StackWalker[] { WALKERS[2] }
};
}
@Test(dataProvider = "walkerProvider")
public void test(StackWalker walker) {
C1.call(walker, BIG_LOOP);
}
// line numbers are hardcoded for now.
// Should annotate the line numbers and auto-generated these constants
// for test verification instead
static final int BEGIN_LINE = 71; // the begin line number of approximate range.
static final int END_LINE = 136; // the end line number of approximate range.
static class C1 { // here is the begin line number of approximate range, L71.
public static void call(StackWalker walker, int loops) {
if (loops == 0) {
String caller = walker.walk(s ->
s.map(StackFrame::getClassName)
.filter(cn -> !cn.startsWith("jdk.internal.reflect.") && !cn.startsWith("java.lang.invoke"))
.skip(2).findFirst()
).get();
assertEquals(caller, C1.class.getName());
walker.forEach(f -> C2.testEmbeddedWalker());
} else {
call(walker, --loops);
}
}
}
static class C2 {
static final StackWalker embeddedWalkers[] = new StackWalker[] {
StackWalker.getInstance(),
StackWalker.getInstance(SHOW_REFLECT_FRAMES),
StackWalker.getInstance(SHOW_HIDDEN_FRAMES)
};
public static void testEmbeddedWalker() {
walk(SMALL_LOOP);
}
static void walk(int loops) {
if (loops == 0) {
Arrays.stream(embeddedWalkers)
.forEach(walker -> run(walker));
} else {
walk(--loops);
}
}
static void run(StackWalker walker) {
MethodHandles.Lookup lookup = MethodHandles.lookup();
MethodHandle handle = null;
try {
handle = lookup.findStatic(C2.class, "call",
MethodType.methodType(void.class, StackWalker.class));
handle.invoke(walker);
} catch(Throwable t) {
throw new RuntimeException(t);
}
}
static void call(StackWalker walker) {
String caller = walker.walk(s ->
s.map(StackFrame::getClassName)
.filter(cn -> !cn.startsWith("jdk.internal.reflect.") && !cn.startsWith("java.lang.invoke"))
.skip(2).findFirst()
).get();
assertEquals(caller, C2.class.getName());
verify(walker, C1.class, "call");
verify(walker, C2.class, "call");
verify(walker, C2.class, "run");
verify(walker, C2.class, "walk");
verify(walker, C2.class, "testEmbeddedWalker");
} // here is the end line number of approximate range, L136.
static void verify(StackWalker walker, Class<?> c, String mn) {
final String fileName = "EmbeddedStackWalkTest.java";
walker.walk(s -> {
s.limit(BIG_LOOP)
.filter(f -> c.getName().equals(f.getClassName()) && mn.equals(f.getMethodName()))
.forEach(f -> {
assertEquals(f.getFileName(), fileName);
int line = f.getLineNumber();
assertTrue(line >= BEGIN_LINE && line <= END_LINE);
StackTraceElement st = f.toStackTraceElement();
assertEquals(c.getName(), st.getClassName());
assertEquals(mn, st.getMethodName());
assertEquals(st.getFileName(), fileName);
line = st.getLineNumber();
assertTrue(line >= BEGIN_LINE && line <= END_LINE);
});
return null;
});
}
}
}
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