278
279 PERF_ENTRY(jlong, Perf_HighResFrequency(JNIEnv *env, jobject perf))
280
281 PerfWrapper("Perf_HighResFrequency");
282
283 // this should be a method in java.lang.System. This value could
284 // be acquired through access to a PerfData performance counter, but
285 // doing so would require that the PerfData monitoring overhead be
286 // incurred by all Java applications, which is unacceptable.
287
288 return os::elapsed_frequency();
289
290 PERF_END
291
292 /// JVM_RegisterPerfMethods
293
294 #define CC (char*) /*cast a literal from (const char*)*/
295 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
296 #define BB "Ljava/nio/ByteBuffer;"
297 #define JLS "Ljava/lang/String;"
298 #define CL_ARGS CC"("JLS"IIJ)"BB
299 #define CBA_ARGS CC"("JLS"II[BI)"BB
300
301 static JNINativeMethod perfmethods[] = {
302
303 {CC"attach", CC"("JLS"II)"BB, FN_PTR(Perf_Attach)},
304 {CC"detach", CC"("BB")V", FN_PTR(Perf_Detach)},
305 {CC"createLong", CL_ARGS, FN_PTR(Perf_CreateLong)},
306 {CC"createByteArray", CBA_ARGS, FN_PTR(Perf_CreateByteArray)},
307 {CC"highResCounter", CC"()J", FN_PTR(Perf_HighResCounter)},
308 {CC"highResFrequency", CC"()J", FN_PTR(Perf_HighResFrequency)}
309 };
310
311 #undef CBA_ARGS
312 #undef CL_ARGS
313 #undef JLS
314 #undef BB
315 #undef FN_PTR
316 #undef CC
317
318 // This one function is exported, used by NativeLookup.
319 JVM_ENTRY(void, JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass))
320 PerfWrapper("JVM_RegisterPerfMethods");
321 {
322 ThreadToNativeFromVM ttnfv(thread);
323 int ok = env->RegisterNatives(perfclass, perfmethods, sizeof(perfmethods)/sizeof(JNINativeMethod));
324 guarantee(ok == 0, "register perf natives");
325 }
326 JVM_END
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278
279 PERF_ENTRY(jlong, Perf_HighResFrequency(JNIEnv *env, jobject perf))
280
281 PerfWrapper("Perf_HighResFrequency");
282
283 // this should be a method in java.lang.System. This value could
284 // be acquired through access to a PerfData performance counter, but
285 // doing so would require that the PerfData monitoring overhead be
286 // incurred by all Java applications, which is unacceptable.
287
288 return os::elapsed_frequency();
289
290 PERF_END
291
292 /// JVM_RegisterPerfMethods
293
294 #define CC (char*) /*cast a literal from (const char*)*/
295 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
296 #define BB "Ljava/nio/ByteBuffer;"
297 #define JLS "Ljava/lang/String;"
298 #define CL_ARGS CC "(" JLS "IIJ)" BB
299 #define CBA_ARGS CC "(" JLS "II[BI)" BB
300
301 static JNINativeMethod perfmethods[] = {
302
303 {CC "attach", CC "(" JLS "II)" BB, FN_PTR(Perf_Attach)},
304 {CC "detach", CC "(" BB ")V", FN_PTR(Perf_Detach)},
305 {CC "createLong", CL_ARGS, FN_PTR(Perf_CreateLong)},
306 {CC "createByteArray", CBA_ARGS, FN_PTR(Perf_CreateByteArray)},
307 {CC "highResCounter", CC "()J", FN_PTR(Perf_HighResCounter)},
308 {CC "highResFrequency", CC "()J", FN_PTR(Perf_HighResFrequency)}
309 };
310
311 #undef CBA_ARGS
312 #undef CL_ARGS
313 #undef JLS
314 #undef BB
315 #undef FN_PTR
316 #undef CC
317
318 // This one function is exported, used by NativeLookup.
319 JVM_ENTRY(void, JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass))
320 PerfWrapper("JVM_RegisterPerfMethods");
321 {
322 ThreadToNativeFromVM ttnfv(thread);
323 int ok = env->RegisterNatives(perfclass, perfmethods, sizeof(perfmethods)/sizeof(JNINativeMethod));
324 guarantee(ok == 0, "register perf natives");
325 }
326 JVM_END
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