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8261095: Add test for clhsdb "symbol" command
Reviewed-by: cjplummer, ysuenaga
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Vipin Sharma authored and YaSuenag committed Mar 17, 2021
1 parent ec95a5c commit 086a66a0cd9fae4855693a75513e77f9942f7567
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import jdk.test.lib.apps.LingeredApp;
import jtreg.SkippedException;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

* @test
* @bug 8261095
* @summary Test the clhsdb 'symbol' command on live process
* @requires vm.hasSA
* @library /test/lib
* @run main/othervm ClhsdbSymbol

public class ClhsdbSymbol {

public static void main(String[] args) throws Exception {
System.out.println("Starting the ClhsdbSymbol test");
LingeredApp theApp = null;

try {
List<String> cmds = null;
String cmdStr = null;
Map<String, List<String>> expStrMap = null;
ClhsdbLauncher test = new ClhsdbLauncher();
theApp = LingeredApp.startApp();
System.out.println("Started LingeredApp with pid " + theApp.getPid());

// Use command "class java.lang.Thread" to get the address of the InstanceKlass for java.lang.Thread
cmdStr = "class java.lang.Thread";
cmds = List.of(cmdStr);
expStrMap = new HashMap<>();
expStrMap.put(cmdStr, List.of("java/lang/Thread"));
String classOutput =, cmds, expStrMap, null);

// Extract the thread InstanceKlass address from the output, which looks similar to the following:
// java/lang/Thread @0x000000080001d940
String threadAddress = classOutput.lines()
.filter(part -> part.startsWith("java/lang/Thread"))
.map(part -> part.split(" @"))
.map(addresses -> addresses[1])
.orElseThrow(() -> new RuntimeException(
"Cannot find address of the InstanceKlass for java.lang.Thread in output"));

// Use "inspect" on the thread address we extracted in the previous step
cmdStr = "inspect " + threadAddress;
cmds = List.of(cmdStr);
expStrMap = new HashMap<>();
expStrMap.put(cmdStr, List.of("Symbol"));
String inspectOutput =, cmds, expStrMap, null);

// The inspect command output will have one line of output that looks like the following.
// Symbol* Klass::_name: Symbol @ 0x0000000800471120
// Extract the Symbol address from it.
String symbolAddress = inspectOutput.lines()
.filter(part -> part.startsWith("Symbol"))
.map(part -> part.split("@ "))
.findFirst().map(symbolParts -> symbolParts[1])
.orElseThrow(() -> new RuntimeException("Cannot find address with Symbol instance"));

// Run "symbol" command on the Symbol instance address extracted in the previous step.
// It should produce the symbol for java/lang/Thread.
cmdStr = "symbol " + symbolAddress;
cmds = List.of(cmdStr);
expStrMap = new HashMap<>();
expStrMap.put(cmdStr, List.of("#java/lang/Thread"));, cmds, expStrMap, null);
} catch (SkippedException se) {
throw se;
} catch (Exception ex) {
throw new RuntimeException("Test ERROR " + ex, ex);
} finally {
System.out.println("Test PASSED");

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