Mercurial > hg > truffle
diff src/share/vm/graal/graalVMEntries.cpp @ 2927:f9c6d9bc4fbc
RiMethod provides branch prediction information
author | Lukas Stadler <lukas.stadler@jku.at> |
---|---|
date | Thu, 09 Jun 2011 17:33:08 +0200 |
parents | 0e3ec0a4eda4 |
children | 66ecfc755c86 |
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--- a/src/share/vm/graal/graalVMEntries.cpp Thu Jun 09 15:25:27 2011 +0200 +++ b/src/share/vm/graal/graalVMEntries.cpp Thu Jun 09 17:33:08 2011 +0200 @@ -30,6 +30,7 @@ #include "graal/graalVmIds.hpp" #include "c1/c1_Runtime1.hpp" #include "memory/oopFactory.hpp" +#include "ci/ciMethodData.hpp" // public byte[] RiMethod_code(long vmId); JNIEXPORT jbyteArray JNICALL Java_com_oracle_graal_runtime_VMEntries_RiMethod_1code(JNIEnv *env, jobject, jlong vmId) { @@ -158,13 +159,13 @@ return JNIHandles::make_local(THREAD, method_resolved); } -// public native int RiMethod_invocationCount(); +// public native int RiMethod_invocationCount(long vmId); JNIEXPORT jint JNICALL Java_com_oracle_graal_runtime_VMEntries_RiMethod_1invocationCount(JNIEnv *, jobject, jlong vmId) { TRACE_graal_3("VMEntries::RiMethod_invocationCount"); return VmIds::get<methodOop>(vmId)->invocation_count(); } -// public native RiTypeProfile RiMethod_typeProfile(int bci); +// public native RiTypeProfile RiMethod_typeProfile(long vmId, int bci); JNIEXPORT jobject JNICALL Java_com_oracle_graal_runtime_VMEntries_RiMethod_1typeProfile(JNIEnv *, jobject, jlong vmId, jint bci) { TRACE_graal_3("VMEntries::RiMethod_typeProfile"); ciMethod* cimethod; @@ -192,6 +193,50 @@ return JNIHandles::make_local(obj()); } +// public native RiTypeProfile RiMethod_branchProfile(long vmId, int bci); +JNIEXPORT jint JNICALL Java_com_oracle_graal_runtime_VMEntries_RiMethod_1branchProbability(JNIEnv *, jobject, jlong vmId, jint bci) { + TRACE_graal_3("VMEntries::RiMethod_typeProfile"); + ciMethodData* method_data; + ciMethod* cimethod; + { + VM_ENTRY_MARK; + cimethod = (ciMethod*)CURRENT_ENV->get_object(VmIds::get<methodOop>(vmId)); + } + method_data = cimethod->method_data(); + + jfloat probability = -1; + + if (!method_data->is_mature()) return -1; + + ciProfileData* data = method_data->bci_to_data(bci); + if (!data->is_JumpData()) return -1; + + // get taken and not taken values + int taken = data->as_JumpData()->taken(); + int not_taken = 0; + if (data->is_BranchData()) { + not_taken = data->as_BranchData()->not_taken(); + } + + // scale the counts to be commensurate with invocation counts: + taken = cimethod->scale_count(taken); + not_taken = cimethod->scale_count(not_taken); + + // Give up if too few (or too many, in which case the sum will overflow) counts to be meaningful. + // We also check that individual counters are positive first, otherwise the sum can become positive. + if (taken < 0 || not_taken < 0 || taken + not_taken < 40) return -1; + + // Pin probability to sane limits + if (taken == 0) + return 0; + else if (not_taken == 0) + return 100; + else { // Compute probability of true path + int probability = (int)(taken * 100.0 / (taken + not_taken)); + return MIN2(99, MAX2(1, probability)); + } +} + // public RiType RiSignature_lookupType(String returnType, HotSpotTypeResolved accessingClass); JNIEXPORT jobject JNICALL Java_com_oracle_graal_runtime_VMEntries_RiSignature_1lookupType(JNIEnv *env, jobject, jstring jname, jobject accessingClass) { TRACE_graal_3("VMEntries::RiSignature_lookupType"); @@ -723,6 +768,7 @@ {CC"RiMethod_uniqueConcreteMethod", CC"("PROXY")"METHOD, FN_PTR(Java_com_oracle_graal_runtime_VMEntries_RiMethod_1uniqueConcreteMethod)}, {CC"RiMethod_invocationCount", CC"("PROXY")I", FN_PTR(Java_com_oracle_graal_runtime_VMEntries_RiMethod_1invocationCount)}, {CC"RiMethod_typeProfile", CC"("PROXY"I)"TYPE_PROFILE, FN_PTR(Java_com_oracle_graal_runtime_VMEntries_RiMethod_1typeProfile)}, + {CC"RiMethod_branchProbability", CC"("PROXY"I)I", FN_PTR(Java_com_oracle_graal_runtime_VMEntries_RiMethod_1branchProbability)}, {CC"RiSignature_lookupType", CC"("STRING RESOLVED_TYPE")"TYPE, FN_PTR(Java_com_oracle_graal_runtime_VMEntries_RiSignature_1lookupType)}, {CC"RiConstantPool_lookupConstant", CC"("PROXY"I)"OBJECT, FN_PTR(Java_com_oracle_graal_runtime_VMEntries_RiConstantPool_1lookupConstant)}, {CC"RiConstantPool_lookupMethod", CC"("PROXY"IB)"METHOD, FN_PTR(Java_com_oracle_graal_runtime_VMEntries_RiConstantPool_1lookupMethod)},