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8295537: Enhance TRACE_METHOD_LINKAGE to show the target MethodHandle

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Reviewed-by: jvernee, redestad, mchung
This commit is contained in:
Ioi Lam 2022-10-27 22:07:54 +00:00
parent 182c215888
commit fd668dc44f
5 changed files with 75 additions and 14 deletions
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24
src/java.base/share/classes/java/lang/invoke/MethodHandleNatives.java
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@ -281,6 +281,12 @@ class MethodHandleNatives {
type,
staticArguments,
caller);
if (TRACE_METHOD_LINKAGE) {
MethodHandle target = callSite.getTarget();
System.out.println("linkCallSite target class => " + target.getClass().getName());
System.out.println("linkCallSite target => " + target.debugString(0));
}
if (callSite instanceof ConstantCallSite) {
appendixResult[0] = callSite.dynamicInvoker();
return Invokers.linkToTargetMethod(type);
@ -298,13 +304,13 @@ class MethodHandleNatives {
Object bsmReference = bootstrapMethod.internalMemberName();
if (bsmReference == null) bsmReference = bootstrapMethod;
String staticArglist = staticArglistForTrace(staticArguments);
System.out.println("linkCallSite "+caller.getName()+" "+
System.out.println("linkCallSite "+getCallerInfo(caller)+" "+
bsmReference+" "+
name+type+"/"+staticArglist);
try {
MemberName res = linkCallSiteImpl(caller, bootstrapMethod, name, type,
staticArguments, appendixResult);
System.out.println("linkCallSite => "+res+" + "+appendixResult[0]);
System.out.println("linkCallSite linkage => "+res+" + "+appendixResult[0]);
return res;
} catch (Throwable ex) {
ex.printStackTrace(); // print now in case exception is swallowed
@ -313,6 +319,20 @@ class MethodHandleNatives {
}
}
/**
* Return a human-readable description of the caller. Something like
* "java.base/java.security.Security.<clinit>(Security.java:82)"
*/
private static String getCallerInfo(Class<?> caller) {
for (StackTraceElement e : Thread.currentThread().getStackTrace()) {
if (e.getClassName().equals(caller.getName())) {
return e.toString();
}
}
// fallback if the caller is somehow missing from the stack.
return caller.getName();
}
// this implements the upcall from the JVM, MethodHandleNatives.linkDynamicConstant:
static Object linkDynamicConstant(Object callerObj,
Object bootstrapMethodObj,