JDK-7055941 : JSR 292 method handle invocation causes excessive deoptimization for types not on boot class path
- Type: Bug
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 7
- Priority: P4
- Status: Closed
- Resolution: Cannot Reproduce
- OS: generic
- CPU: generic
- Submitted: 2011-06-17
- Updated: 2011-09-22
- Resolved: 2011-09-22
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Resolved: Release in which this issue/RFE has been resolved.
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| JDK 7 |
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7u2Resolved  |
Related Reports
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Description
The server compiler cannot gracefully handle calls to MH.invoke[Exact] when one of the types present is not on the BCP. The problem is in SystemDictionary::find_method_handle_invoke, when run in the compile thread, when it uses the path involving non_cached_result. We should be caching the required results on a class loader object associated with the referencing class.
/*
Run:
$ javac -d . TooManyTraps.java
$ java -client -cp . -XX:+PrintCompilation TooManyTraps
$ java -server -cp . -XX:+PrintCompilation TooManyTraps
*/
import java.lang.invoke.*;
import static java.lang.invoke.MethodType.*;
import static java.lang.invoke.MethodHandles.*;
class TooManyTraps {
static void callme(Object x) { }
static void callme(TooManyTraps x) { }
public static void main(String... av) throws Throwable {
MethodHandle mh1 = lookup().findStatic(TooManyTraps.class, "callme", methodType(void.class, Object.class));
MethodHandle mh2 = lookup().findStatic(TooManyTraps.class, "callme", methodType(void.class, TooManyTraps.class));
System.out.println("starting...");
long t0 = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
test1(1000, mh1);
}
long t1 = System.currentTimeMillis();
System.out.println("fast way took "+(t1-t0)+"ms");
t0 = System.currentTimeMillis();
for (int i = 0; i < 1000; i++) {
test2(1000, mh2);
}
t1 = System.currentTimeMillis();
System.out.println("slow way took "+(t1-t0)+"ms");
}
static void test1(int reps, MethodHandle mh) throws Throwable {
for (int i = 0; i < reps; i++) {
mh.invokeExact((Object)null);
}
}
static void test2(int reps, MethodHandle mh) throws Throwable {
for (int i = 0; i < reps; i++) {
mh.invokeExact((TooManyTraps)null);
}
}
}
/*
--------
$JAVA_HOME/bin/javac -d . TooManyTraps.java
--------
$JAVA_HOME/bin/java -client -XX:+PrintCompilation -cp . TooManyTraps
starting...
70 1 java.lang.String::equals (88 bytes)
72 2 java.lang.String::hashCode (67 bytes)
72 3 java.lang.String::charAt (33 bytes)
72 4 java.lang.String::indexOf (87 bytes)
72 5 sun.nio.cs.US_ASCII$Encoder::encode (107 bytes)
73 6 java.lang.String::lastIndexOf (68 bytes)
73 7 TooManyTraps::callme (1 bytes)
73 8 TooManyTraps::test1 (22 bytes)
fast way took 19ms
88 9 TooManyTraps::callme (1 bytes)
88 10 TooManyTraps::test2 (22 bytes)
slow way took 23ms
--------
$JAVA_HOME/bin/java -server -XX:+PrintCompilation -cp . TooManyTraps
starting...
78 1 TooManyTraps::callme (1 bytes)
85 2 TooManyTraps::test1 (22 bytes)
87 1 % TooManyTraps::test1 @ 2 (22 bytes)
fast way took 21ms
100 3 TooManyTraps::callme (1 bytes)
100 4 TooManyTraps::test2 (22 bytes)
100 4 TooManyTraps::test2 (22 bytes) made not entrant
101 2 % TooManyTraps::test2 @ 2 (22 bytes)
102 2 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
102 5 TooManyTraps::test2 (22 bytes)
102 3 % TooManyTraps::test2 @ 2 (22 bytes)
103 3 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
103 5 TooManyTraps::test2 (22 bytes) made not entrant
103 4 % TooManyTraps::test2 @ 2 (22 bytes)
103 4 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
104 6 TooManyTraps::test2 (22 bytes)
104 5 % TooManyTraps::test2 @ 2 (22 bytes)
130 6 TooManyTraps::test2 (22 bytes) made not entrant
131 5 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
131 7 TooManyTraps::test2 (22 bytes)
131 6 % TooManyTraps::test2 @ 2 (22 bytes)
132 6 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
132 7 TooManyTraps::test2 (22 bytes) made not entrant
132 7 % TooManyTraps::test2 @ 2 (22 bytes)
133 7 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
133 8 TooManyTraps::test2 (22 bytes)
133 8 % TooManyTraps::test2 @ 2 (22 bytes)
134 8 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
134 8 TooManyTraps::test2 (22 bytes) made not entrant
135 9 % TooManyTraps::test2 @ 2 (22 bytes)
135 9 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
135 9 TooManyTraps::test2 (22 bytes)
179 9 TooManyTraps::test2 (22 bytes) made not entrant
180 10 % TooManyTraps::test2 @ 2 (22 bytes)
181 10 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
181 10 TooManyTraps::test2 (22 bytes)
181 11 % TooManyTraps::test2 @ 2 (22 bytes)
182 11 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
182 10 TooManyTraps::test2 (22 bytes) made not entrant
183 12 % TooManyTraps::test2 @ 2 (22 bytes)
185 12 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
185 11 TooManyTraps::test2 (22 bytes)
185 13 % TooManyTraps::test2 @ 2 (22 bytes)
186 13 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
186 11 TooManyTraps::test2 (22 bytes) made not entrant
186 14 % TooManyTraps::test2 @ 2 (22 bytes)
187 14 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
208 12 TooManyTraps::test2 (22 bytes)
209 15 % TooManyTraps::test2 @ 2 (22 bytes)
210 15 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
210 12 TooManyTraps::test2 (22 bytes) made not entrant
210 16 % TooManyTraps::test2 @ 2 (22 bytes)
211 16 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
211 13 TooManyTraps::test2 (22 bytes)
211 17 % TooManyTraps::test2 @ 2 (22 bytes)
212 17 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
212 13 TooManyTraps::test2 (22 bytes) made not entrant
212 18 % TooManyTraps::test2 @ 2 (22 bytes)
213 18 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
213 14 TooManyTraps::test2 (22 bytes)
213 19 % TooManyTraps::test2 @ 2 (22 bytes)
214 19 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
245 14 TooManyTraps::test2 (22 bytes) made not entrant
245 20 % TooManyTraps::test2 @ 2 (22 bytes)
246 20 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
246 15 TooManyTraps::test2 (22 bytes)
246 21 % TooManyTraps::test2 @ 2 (22 bytes)
247 21 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
247 15 TooManyTraps::test2 (22 bytes) made not entrant
248 22 % TooManyTraps::test2 @ 2 (22 bytes)
249 22 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
249 16 TooManyTraps::test2 (22 bytes)
251 23 % TooManyTraps::test2 @ 2 (22 bytes)
251 23 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
251 16 TooManyTraps::test2 (22 bytes) made not entrant
252 24 % TooManyTraps::test2 @ 2 (22 bytes)
252 24 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
293 17 TooManyTraps::test2 (22 bytes)
294 25 % TooManyTraps::test2 @ 2 (22 bytes)
294 25 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
295 17 TooManyTraps::test2 (22 bytes) made not entrant
295 26 % TooManyTraps::test2 @ 2 (22 bytes)
296 26 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
296 18 TooManyTraps::test2 (22 bytes)
296 27 % TooManyTraps::test2 @ 2 (22 bytes)
297 27 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
297 18 TooManyTraps::test2 (22 bytes) made not entrant
297 28 % TooManyTraps::test2 @ 2 (22 bytes)
298 28 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
298 19 TooManyTraps::test2 (22 bytes)
298 29 % TooManyTraps::test2 @ 2 (22 bytes)
299 29 % TooManyTraps::test2 @ -2 (22 bytes) made not entrant
343 19 TooManyTraps::test2 (22 bytes) made not entrant
slow way took 246ms
--------
*/
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