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/*
* Copyright (c) 2001, 2016, 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 4446677
* @bug 8158237
* @summary debuggee used to crash when debugging under jbuilder
* @author jjh
*
* @run build TestScaffold VMConnection TargetListener TargetAdapter
* @run compile -g BacktraceFieldTest.java
* @run driver BacktraceFieldTest
*/
/*
* The fix for this bug filters out the backtrace field from the list
* of fields for java.lang.Throwable.
* This test verifies that this really happens, and also verifies that the fix
* doesn't incorrectly discard other fields.
*/
import com.sun.jdi.*;
import com.sun.jdi.event.*;
import com.sun.jdi.request.*;
import java.util.*;
/********** target program **********/
class Testy {
/*
* This is used to verify that the fix doesn't filter out fields that it
* shouldn't. 7 is an abitrary number, and this isn't a definitive
* test; the fix could conceivably filter out the 89th field of a class
* named Foo.
* To verify that this part of this test works, first uncomment the field8
* line and verify that the test fails, and then rename a field to xxx and
* verify that the test fails.
*/
int field1;
int field2;
int field3;
int field4;
int field5;
int field6;
final static int field7 = 7; // Value is the number of fields.
//int field8;
Testy() {
}
}
class BacktraceFieldTarg {
public static void gus() {
}
public static void main(String[] args) {
Testy myTesty = new Testy();
try {
throw new RuntimeException("jjException");
} catch (Exception ee) {
gus();
System.out.println("debuggee: Exception: " + ee);
}
}
}
/********** test program **********/
public class BacktraceFieldTest extends TestScaffold {
ThreadReference mainThread;
BacktraceFieldTest (String args[]) {
super(args);
}
public static void main(String[] args) throws Exception {
new BacktraceFieldTest(args).startTests();
}
private void printval(ArrayReference backTraceVal, int index) throws Exception {
ArrayReference val = (ArrayReference)backTraceVal.getValue(index);
println("BT: val at " + index + " = " + val);
// The segv used to happen here for index = 0
// Now all objects in the backtrace are objects.
Object xVal = (Object)val.getValue(0);
println("BT: xVal = " + xVal);
}
/********** test core **********/
protected void runTests() throws Exception {
/*
* Get to the top of gus()
* to determine mainThread
*/
BreakpointEvent bpe = startTo("BacktraceFieldTarg", "gus", "()V");
mainThread = bpe.thread();
/*
* We are now one frame below the exception frame that contains
* our ee var.
*/
StackFrame myFrame = mainThread.frame(1);
LocalVariable lv = myFrame.visibleVariableByName("ee");
println("BT: lv = " + lv);
println("BT: lvType = " + lv.typeName());
List allFields = ((ReferenceType)(lv.type())).allFields();
println("BT: allFields = " + allFields);
/*
* Search through the fields of ee to verify that
* java.lang.Throwable.backtrace isn't there.
*/
boolean backtrace_found = false;
Iterator iter = allFields.iterator();
while(iter.hasNext()) {
Field ff = (Field)iter.next();
if (ff.toString().equals("java.lang.Throwable.backtrace")) {
backtrace_found = true;
println("java.lang.Throwable.backtrace field not filtered out.");
/*
* If you want to experience the segv this bug causes, change
* this test to 1 == 1 and run it with jdk 1.4, build 74 or earlier
*/
if (1 == 1) {
// The following code will show the segv that this can cause.
ObjectReference myVal = (ObjectReference)myFrame.getValue(lv);
println("BT: myVal = " + myVal);
ArrayReference backTraceVal = (ArrayReference)myVal.getValue(ff);
println("BT: backTraceVal = " + backTraceVal);
printval(backTraceVal, 0);
printval(backTraceVal, 1);
printval(backTraceVal, 2);
printval(backTraceVal, 3); // backtrace has 4 elements
try {
printval(backTraceVal, 4);
} catch (Exception e) {
println("Exception " + e);
}
}
break;
}
}
if (!backtrace_found) {
failure("ERROR: java.lang.Throwable.backtrace field filtered out.");
}
// Next, verify that we don't accidently discard a field that we shouldn't
if (!testFailed) {
lv = myFrame.visibleVariableByName("myTesty");
allFields = ((ReferenceType)(lv.type())).allFields();
println("BT: allFields = " + allFields);
if (allFields.size() != Testy.field7) {
failure("ERROR: wrong number of fields; expected " + Testy.field7 + ", Got " + allFields.size());
} else {
iter = allFields.iterator();
while(iter.hasNext()) {
String fieldName = ((Field)iter.next()).toString();
if (!fieldName.startsWith("Testy.field", 0)) {
failure("ERROR: Found bogus field: " + fieldName.toString());
}
}
}
}
listenUntilVMDisconnect();
/*
* deal with results of test
* if anything has called failure("foo") testFailed will be true
*/
if (!testFailed) {
println("BacktraceFieldTest: passed");
} else {
throw new Exception("BacktraceFieldTest: failed");
}
}
}
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