6906727: UseCompressedOops: some card-marking fixes related to object arrays
Summary: Introduced a new write_ref_array(HeapWords* start, size_t count) method that does the requisite MemRegion range calculation so (some of the) clients of the erstwhile write_ref_array(MemRegion mr) do not need to worry. This removed all external uses of array_size(), which was also simplified and made private. Asserts were added to catch other possible issues. Further, less essential, fixes stemming from this investigation are deferred to CR 6904516 (to follow shortly in hs17).
Reviewed-by: kvn, coleenp, jmasa
/*
* Copyright 2001-2005 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
/*
* Implementation of class sun.misc.Perf
*/
#include "incls/_precompiled.incl"
#include "incls/_perf.cpp.incl"
#define PERF_ENTRY(result_type, header) \
JVM_ENTRY(result_type, header)
#define PERF_END JVM_END
#define PerfWrapper(arg) /* Unimplemented at this time */
static char* jstr_to_utf(JNIEnv *env, jstring str, TRAPS) {
char* utfstr = NULL;
if (str == NULL) {
THROW_0(vmSymbols::java_lang_NullPointerException());
//throw_new(env,"NullPointerException");
}
int len = env->GetStringUTFLength(str);
int unicode_len = env->GetStringLength(str);
utfstr = NEW_RESOURCE_ARRAY(char, len + 1);
env->GetStringUTFRegion(str, 0, unicode_len, utfstr);
return utfstr;
}
PERF_ENTRY(jobject, Perf_Attach(JNIEnv *env, jobject unused, jstring user, int vmid, int mode))
PerfWrapper("Perf_Attach");
char* address = 0;
size_t capacity = 0;
const char* user_utf = NULL;
ResourceMark rm;
{
ThreadToNativeFromVM ttnfv(thread);
user_utf = user == NULL ? NULL : jstr_to_utf(env, user, CHECK_NULL);
}
if (mode != PerfMemory::PERF_MODE_RO &&
mode != PerfMemory::PERF_MODE_RW) {
THROW_0(vmSymbols::java_lang_IllegalArgumentException());
}
// attach to the PerfData memory region for the specified VM
PerfMemory::attach(user_utf, vmid, (PerfMemory::PerfMemoryMode) mode,
&address, &capacity, CHECK_NULL);
{
ThreadToNativeFromVM ttnfv(thread);
return env->NewDirectByteBuffer(address, (jlong)capacity);
}
PERF_END
PERF_ENTRY(void, Perf_Detach(JNIEnv *env, jobject unused, jobject buffer))
PerfWrapper("Perf_Detach");
void* address = 0;
jlong capacity = 0;
// get buffer address and capacity
{
ThreadToNativeFromVM ttnfv(thread);
address = env->GetDirectBufferAddress(buffer);
capacity = env->GetDirectBufferCapacity(buffer);
}
PerfMemory::detach((char*)address, capacity, CHECK);
PERF_END
PERF_ENTRY(jobject, Perf_CreateLong(JNIEnv *env, jobject perf, jstring name,
int variability, int units, jlong value))
PerfWrapper("Perf_CreateLong");
char* name_utf = NULL;
if (units <= 0 || units > PerfData::U_Last) {
debug_only(warning("unexpected units argument, units = %d", units));
THROW_0(vmSymbols::java_lang_IllegalArgumentException());
}
ResourceMark rm;
{
ThreadToNativeFromVM ttnfv(thread);
name_utf = jstr_to_utf(env, name, CHECK_NULL);
}
PerfLong* pl = NULL;
// check that the PerfData name doesn't already exist
if (PerfDataManager::exists(name_utf)) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "PerfLong name already exists");
}
switch(variability) {
case 1: /* V_Constant */
pl = PerfDataManager::create_long_constant(NULL_NS, (char *)name_utf,
(PerfData::Units)units, value,
CHECK_NULL);
break;
case 2: /* V_Variable */
pl = PerfDataManager::create_long_variable(NULL_NS, (char *)name_utf,
(PerfData::Units)units, value,
CHECK_NULL);
break;
case 3: /* V_Monotonic Counter */
pl = PerfDataManager::create_long_counter(NULL_NS, (char *)name_utf,
(PerfData::Units)units, value,
CHECK_NULL);
break;
default: /* Illegal Argument */
debug_only(warning("unexpected variability value: %d", variability));
THROW_0(vmSymbols::java_lang_IllegalArgumentException());
break;
}
long* lp = (long*)pl->get_address();
{
ThreadToNativeFromVM ttnfv(thread);
return env->NewDirectByteBuffer(lp, sizeof(jlong));
}
PERF_END
PERF_ENTRY(jobject, Perf_CreateByteArray(JNIEnv *env, jobject perf,
jstring name, jint variability,
jint units, jbyteArray value,
jint maxlength))
PerfWrapper("Perf_CreateByteArray");
// check for valid byte array objects
if (name == NULL || value == NULL) {
THROW_0(vmSymbols::java_lang_NullPointerException());
}
// check for valid variability classification
if (variability != PerfData::V_Constant &&
variability != PerfData::V_Variable) {
debug_only(warning("unexpected variability value: %d", variability));
THROW_0(vmSymbols::java_lang_IllegalArgumentException());
}
// check for valid units
if (units != PerfData::U_String) {
// only String based ByteArray objects are currently supported
debug_only(warning("unexpected units value: %d", variability));
THROW_0(vmSymbols::java_lang_IllegalArgumentException());
}
int value_length;
char* name_utf = NULL;
jbyte* value_local = NULL;
ResourceMark rm;
{
ThreadToNativeFromVM ttnfv(thread);
name_utf = jstr_to_utf(env, name, CHECK_NULL);
value_length = env->GetArrayLength(value);
value_local = NEW_RESOURCE_ARRAY(jbyte, value_length + 1);
env->GetByteArrayRegion(value, 0, value_length, value_local);
}
// check that the counter name doesn't already exist
if (PerfDataManager::exists((char*)name_utf)) {
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "PerfByteArray name already exists");
}
PerfByteArray* pbv = NULL;
if (units == PerfData::U_String) {
if (variability == PerfData::V_Constant) {
// create the string constant
pbv = PerfDataManager::create_string_constant(NULL_NS, (char*)name_utf,
(char*)value_local,
CHECK_NULL);
assert(maxlength == value_length, "string constant length should be == maxlength");
maxlength = value_length;
}
else {
// create the string variable
pbv = PerfDataManager::create_string_variable(NULL_NS, (char*)name_utf,
maxlength,
(char*)value_local,
CHECK_NULL);
assert(maxlength >= value_length,"string variable length should be <= maxlength");
}
}
char* cp = (char*)pbv->get_address();
{
ThreadToNativeFromVM ttnfv(thread);
return env->NewDirectByteBuffer(cp, maxlength+1);
}
PERF_END
PERF_ENTRY(jlong, Perf_HighResCounter(JNIEnv *env, jobject perf))
PerfWrapper("Perf_HighResCounter");
// this should be a method in java.lang.System. This value could
// be acquired through access to a PerfData performance counter, but
// doing so would require that the PerfData monitoring overhead be
// incurred by all Java applications, which is unacceptable.
return os::elapsed_counter();
PERF_END
PERF_ENTRY(jlong, Perf_HighResFrequency(JNIEnv *env, jobject perf))
PerfWrapper("Perf_HighResFrequency");
// this should be a method in java.lang.System. This value could
// be acquired through access to a PerfData performance counter, but
// doing so would require that the PerfData monitoring overhead be
// incurred by all Java applications, which is unacceptable.
return os::elapsed_frequency();
PERF_END
/// JVM_RegisterPerfMethods
#define CC (char*) /*cast a literal from (const char*)*/
#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
#define BB "Ljava/nio/ByteBuffer;"
#define JLS "Ljava/lang/String;"
#define CL_ARGS CC"("JLS"IIJ)"BB
#define CBA_ARGS CC"("JLS"II[BI)"BB
static JNINativeMethod perfmethods[] = {
{CC"attach", CC"("JLS"II)"BB, FN_PTR(Perf_Attach)},
{CC"detach", CC"("BB")V", FN_PTR(Perf_Detach)},
{CC"createLong", CL_ARGS, FN_PTR(Perf_CreateLong)},
{CC"createByteArray", CBA_ARGS, FN_PTR(Perf_CreateByteArray)},
{CC"highResCounter", CC"()J", FN_PTR(Perf_HighResCounter)},
{CC"highResFrequency", CC"()J", FN_PTR(Perf_HighResFrequency)}
};
#undef CBA_ARGS
#undef CL_ARGS
#undef JLS
#undef BB
#undef FN_PTR
#undef CC
// This one function is exported, used by NativeLookup.
JVM_ENTRY(void, JVM_RegisterPerfMethods(JNIEnv *env, jclass perfclass))
PerfWrapper("JVM_RegisterPerfMethods");
{
ThreadToNativeFromVM ttnfv(thread);
int ok = env->RegisterNatives(perfclass, perfmethods, sizeof(perfmethods)/sizeof(JNINativeMethod));
guarantee(ok == 0, "register perf natives");
}
JVM_END