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8038240: new WB API to get nmethod

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Reviewed-by: morris, kvn
This commit is contained in:
Igor Ignatyev 2014-03-27 11:17:26 +04:00
parent ac75d4fc2f
commit d9187e9799
6 changed files with 169 additions and 6 deletions
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42
hotspot/src/share/vm/prims/whitebox.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -510,6 +510,44 @@ WB_ENTRY(jstring, WB_GetCPUFeatures(JNIEnv* env, jobject o))
return features_string;
WB_END
WB_ENTRY(jobjectArray, WB_GetNMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
ResourceMark rm(THREAD);
jmethodID jmid = reflected_method_to_jmid(thread, env, method);
CHECK_JNI_EXCEPTION_(env, NULL);
methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
jobjectArray result = NULL;
if (code == NULL) {
return result;
}
int insts_size = code->insts_size();
ThreadToNativeFromVM ttn(thread);
jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
CHECK_JNI_EXCEPTION_(env, NULL);
result = env->NewObjectArray(2, clazz, NULL);
if (result == NULL) {
return result;
}
clazz = env->FindClass(vmSymbols::java_lang_Integer()->as_C_string());
CHECK_JNI_EXCEPTION_(env, NULL);
jmethodID constructor = env->GetMethodID(clazz, vmSymbols::object_initializer_name()->as_C_string(), vmSymbols::int_void_signature()->as_C_string());
CHECK_JNI_EXCEPTION_(env, NULL);
jobject obj = env->NewObject(clazz, constructor, code->comp_level());
CHECK_JNI_EXCEPTION_(env, NULL);
env->SetObjectArrayElement(result, 0, obj);
jbyteArray insts = env->NewByteArray(insts_size);
CHECK_JNI_EXCEPTION_(env, NULL);
env->SetByteArrayRegion(insts, 0, insts_size, (jbyte*) code->insts_begin());
env->SetObjectArrayElement(result, 1, insts);
return result;
WB_END
//Some convenience methods to deal with objects from java
int WhiteBox::offset_for_field(const char* field_name, oop object,
Symbol* signature_symbol) {
@ -622,6 +660,8 @@ static JNINativeMethod methods[] = {
{CC"fullGC", CC"()V", (void*)&WB_FullGC },
{CC"readReservedMemory", CC"()V", (void*)&WB_ReadReservedMemory },
{CC"getCPUFeatures", CC"()Ljava/lang/String;", (void*)&WB_GetCPUFeatures },
{CC"getNMethod", CC"(Ljava/lang/reflect/Executable;Z)[Ljava/lang/Object;",
(void*)&WB_GetNMethod },
};
#undef CC