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6862945: 4/3 conversion of jmethodID to methodOop in JVMTI is too expensive

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Refactor JNIHandles::checked_resolve_jmethod_id() into fast and paranoid parts.

Reviewed-by: never, alanb
This commit is contained in:
Daniel D. Daugherty 2009-08-11 11:57:51 -06:00
parent 10e13deca1
commit aca1d9534f
2 changed files with 17 additions and 6 deletions
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9
hotspot/src/share/vm/prims/jniCheck.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 2001-2009 Sun Microsystems, Inc. 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
@ -96,6 +96,7 @@ static const char * fatal_received_null_class = "JNI received a null class";
static const char * fatal_class_not_a_class = "JNI received a class argument that is not a class";
static const char * fatal_class_not_a_throwable_class = "JNI Throw or ThrowNew received a class argument that is not a Throwable or Throwable subclass";
static const char * fatal_wrong_class_or_method = "Wrong object class or methodID passed to JNI call";
static const char * fatal_non_weak_method = "non-weak methodID passed to JNI call";
static const char * fatal_unknown_array_object = "Unknown array object passed to JNI array operations";
static const char * fatal_object_array_expected = "Object array expected but not received for JNI array operation";
static const char * fatal_non_array = "Non-array passed to JNI array operations";
@ -291,10 +292,16 @@ oop jniCheck::validate_handle(JavaThread* thr, jobject obj) {
methodOop jniCheck::validate_jmethod_id(JavaThread* thr, jmethodID method_id) {
ASSERT_OOPS_ALLOWED;
// do the fast jmethodID check first
methodOop moop = JNIHandles::checked_resolve_jmethod_id(method_id);
if (moop == NULL) {
ReportJNIFatalError(thr, fatal_wrong_class_or_method);
}
// jmethodIDs are supposed to be weak global handles, but that
// can be expensive so check it last
else if (!JNIHandles::is_weak_global_handle((jobject) method_id)) {
ReportJNIFatalError(thr, fatal_non_weak_method);
}
return moop;
}

14
hotspot/src/share/vm/runtime/jniHandles.hpp
View file

@ -1,5 +1,5 @@
/*
* Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 1998-2009 Sun Microsystems, Inc. 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
@ -196,12 +196,16 @@ inline methodOop JNIHandles::resolve_jmethod_id(jmethodID mid) {
};
inline methodOop JNIHandles::checked_resolve_jmethod_id(jmethodID mid) {
jobject handle = (jobject)mid;
if (is_weak_global_handle(handle)) {
return (methodOop) resolve_non_null(handle);
} else {
if (mid == NULL) {
return (methodOop) NULL;
}
oop o = resolve_non_null((jobject) mid);
if (!o->is_method()) {
return (methodOop) NULL;
}
return (methodOop) o;
};