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提交 cb3ddd4e 编写于 作者: N never
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6965671: fatal error: acquiring lock JNIGlobalHandle_lock/16 out of order with... 

6965671: fatal error: acquiring lock JNIGlobalHandle_lock/16 out of order with lock CodeCache_lock/1
Reviewed-by: kvn, dcubed
上级 7445c7f5
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Showing with 25 addition and 181 deletion
src/share/vm/prims/jvmtiCodeBlobEvents.cpp
浏览文件 @ cb3ddd4e
/*
* Copyright (c) 2003, 2009, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2003, 2010, 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
......@@ -118,34 +118,13 @@ void CodeBlobCollector::do_blob(CodeBlob* cb) {
for (int i=0; i<_global_code_blobs->length(); i++) {
JvmtiCodeBlobDesc* scb = _global_code_blobs->at(i);
if (addr == scb->code_begin()) {
ShouldNotReachHere();
return;
}
}
// we must name the CodeBlob - some CodeBlobs already have names :-
// - stubs used by compiled code to call a (static) C++ runtime routine
// - non-relocatable machine code such as the interpreter, stubroutines, etc.
// - various singleton blobs
//
// others are unnamed so we create a name :-
// - OSR adapter (interpreter frame that has been on-stack replaced)
// - I2C and C2I adapters
const char* name = NULL;
if (cb->is_runtime_stub()) {
name = ((RuntimeStub*)cb)->name();
}
if (cb->is_buffer_blob()) {
name = ((BufferBlob*)cb)->name();
}
if (cb->is_deoptimization_stub() || cb->is_safepoint_stub()) {
name = ((SingletonBlob*)cb)->name();
}
if (cb->is_uncommon_trap_stub() || cb->is_exception_stub()) {
name = ((SingletonBlob*)cb)->name();
}
// record the CodeBlob details as a JvmtiCodeBlobDesc
JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(name, cb->instructions_begin(),
JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(cb->name(), cb->instructions_begin(),
cb->instructions_end());
_global_code_blobs->append(scb);
}
......@@ -197,7 +176,10 @@ void CodeBlobCollector::collect() {
jvmtiError JvmtiCodeBlobEvents::generate_dynamic_code_events(JvmtiEnv* env) {
CodeBlobCollector collector;
// first collect all the code blobs
// First collect all the code blobs. This has to be done in a
// single pass over the code cache with CodeCache_lock held because
// there isn't any safe way to iterate over regular CodeBlobs since
// they can be freed at any point.
{
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
collector.collect();
......@@ -213,166 +195,28 @@ jvmtiError JvmtiCodeBlobEvents::generate_dynamic_code_events(JvmtiEnv* env) {
}
// Support class to describe a nmethod in the CodeCache
class nmethodDesc: public CHeapObj {
private:
jmethodID _jmethod_id;
address _code_begin;
address _code_end;
jvmtiAddrLocationMap* _map;
jint _map_length;
public:
nmethodDesc(jmethodID jmethod_id, address code_begin, address code_end,
jvmtiAddrLocationMap* map, jint map_length) {
_jmethod_id = jmethod_id;
_code_begin = code_begin;
_code_end = code_end;
_map = map;
_map_length = map_length;
}
jmethodID jmethod_id() const { return _jmethod_id; }
address code_begin() const { return _code_begin; }
address code_end() const { return _code_end; }
jvmtiAddrLocationMap* map() const { return _map; }
jint map_length() const { return _map_length; }
};
// Support class to collect a list of the nmethod CodeBlobs in
// the CodeCache.
//
// Usage :-
//
// nmethodCollector collector;
//
// collector.collect();
// JvmtiCodeBlobDesc* blob = collector.first();
// while (blob != NULL) {
// :
// blob = collector.next();
// }
//
class nmethodCollector : StackObj {
private:
GrowableArray<nmethodDesc*>* _nmethods; // collect nmethods
int _pos; // iteration support
// used during a collection
static GrowableArray<nmethodDesc*>* _global_nmethods;
static void do_nmethod(nmethod* nm);
public:
nmethodCollector() {
_nmethods = NULL;
_pos = -1;
}
~nmethodCollector() {
if (_nmethods != NULL) {
for (int i=0; i<_nmethods->length(); i++) {
nmethodDesc* blob = _nmethods->at(i);
if (blob->map()!= NULL) {
FREE_C_HEAP_ARRAY(jvmtiAddrLocationMap, blob->map());
}
}
delete _nmethods;
}
}
// collect list of nmethods in the cache
void collect();
// iteration support - return first code blob
nmethodDesc* first() {
assert(_nmethods != NULL, "not collected");
if (_nmethods->length() == 0) {
return NULL;
}
_pos = 0;
return _nmethods->at(0);
}
// iteration support - return next code blob
nmethodDesc* next() {
assert(_pos >= 0, "iteration not started");
if (_pos+1 >= _nmethods->length()) {
return NULL;
}
return _nmethods->at(++_pos);
}
};
// used during collection
GrowableArray<nmethodDesc*>* nmethodCollector::_global_nmethods;
// called for each nmethod in the CodeCache
//
// This function simply adds a descriptor for each nmethod to the global list.
void nmethodCollector::do_nmethod(nmethod* nm) {
// ignore zombies
if (!nm->is_alive()) {
return;
}
assert(nm->method() != NULL, "checking");
// create the location map for the nmethod.
jvmtiAddrLocationMap* map;
jint map_length;
JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nm, &map, &map_length);
// record the nmethod details
nmethodDesc* snm = new nmethodDesc(nm->get_and_cache_jmethod_id(),
nm->code_begin(),
nm->code_end(),
map,
map_length);
_global_nmethods->append(snm);
}
// collects a list of nmethod in the CodeCache.
//
// The created list is growable array of nmethodDesc - each one describes
// a nmethod and includs its JVMTI address location map.
void nmethodCollector::collect() {
assert_locked_or_safepoint(CodeCache_lock);
assert(_global_nmethods == NULL, "checking");
// create the list
_global_nmethods = new (ResourceObj::C_HEAP) GrowableArray<nmethodDesc*>(100,true);
// any a descriptor for each nmethod to the list.
CodeCache::nmethods_do(do_nmethod);
// make the list the instance list
_nmethods = _global_nmethods;
_global_nmethods = NULL;
}
// Generate a COMPILED_METHOD_LOAD event for each nnmethod
jvmtiError JvmtiCodeBlobEvents::generate_compiled_method_load_events(JvmtiEnv* env) {
HandleMark hm;
nmethodCollector collector;
// first collect all nmethods
{
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
collector.collect();
}
// iterate over the list and post an event for each nmethod
nmethodDesc* nm_desc = collector.first();
while (nm_desc != NULL) {
jmethodID mid = nm_desc->jmethod_id();
assert(mid != NULL, "checking");
JvmtiExport::post_compiled_method_load(env, mid,
(jint)(nm_desc->code_end() - nm_desc->code_begin()),
nm_desc->code_begin(), nm_desc->map_length(),
nm_desc->map());
nm_desc = collector.next();
// Walk the CodeCache notifying for live nmethods. The code cache
// may be changing while this is happening which is ok since newly
// created nmethod will notify normally and nmethods which are freed
// can be safely skipped.
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
nmethod* current = CodeCache::first_nmethod();
while (current != NULL) {
// Lock the nmethod so it can't be freed
nmethodLocker nml(current);
// Only notify for live nmethods
if (current->is_alive()) {
// Don't hold the lock over the notify or jmethodID creation
MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
current->get_and_cache_jmethod_id();
JvmtiExport::post_compiled_method_load(current);
}
current = CodeCache::next_nmethod(current);
}
return JVMTI_ERROR_NONE;
}
......
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