author | acorn |
Fri, 22 Oct 2010 15:59:34 -0400 | |
changeset 6975 | dc9b63952682 |
parent 5547 | f4b087cbb361 |
child 7123 | 523bb0f29d61 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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parents:
2137
diff
changeset
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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parents:
2137
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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# include "incls/_precompiled.incl" |
|
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# include "incls/_jvmtiImpl.cpp.incl" |
|
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||
28 |
// |
|
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// class JvmtiAgentThread |
|
30 |
// |
|
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// JavaThread used to wrap a thread started by an agent |
|
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// using the JVMTI method RunAgentThread. |
|
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// |
|
34 |
||
35 |
JvmtiAgentThread::JvmtiAgentThread(JvmtiEnv* env, jvmtiStartFunction start_fn, const void *start_arg) |
|
36 |
: JavaThread(start_function_wrapper) { |
|
37 |
_env = env; |
|
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_start_fn = start_fn; |
|
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_start_arg = start_arg; |
|
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} |
|
41 |
||
42 |
void |
|
43 |
JvmtiAgentThread::start_function_wrapper(JavaThread *thread, TRAPS) { |
|
44 |
// It is expected that any Agent threads will be created as |
|
45 |
// Java Threads. If this is the case, notification of the creation |
|
46 |
// of the thread is given in JavaThread::thread_main(). |
|
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assert(thread->is_Java_thread(), "debugger thread should be a Java Thread"); |
|
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assert(thread == JavaThread::current(), "sanity check"); |
|
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||
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JvmtiAgentThread *dthread = (JvmtiAgentThread *)thread; |
|
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dthread->call_start_function(); |
|
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} |
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||
54 |
void |
|
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JvmtiAgentThread::call_start_function() { |
|
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ThreadToNativeFromVM transition(this); |
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_start_fn(_env->jvmti_external(), jni_environment(), (void*)_start_arg); |
|
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} |
|
59 |
||
60 |
||
61 |
// |
|
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// class GrowableCache - private methods |
|
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// |
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64 |
||
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void GrowableCache::recache() { |
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int len = _elements->length(); |
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||
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FREE_C_HEAP_ARRAY(address, _cache); |
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_cache = NEW_C_HEAP_ARRAY(address,len+1); |
|
70 |
||
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for (int i=0; i<len; i++) { |
|
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_cache[i] = _elements->at(i)->getCacheValue(); |
|
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// |
|
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// The cache entry has gone bad. Without a valid frame pointer |
|
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// value, the entry is useless so we simply delete it in product |
|
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// mode. The call to remove() will rebuild the cache again |
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// without the bad entry. |
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// |
|
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if (_cache[i] == NULL) { |
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assert(false, "cannot recache NULL elements"); |
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remove(i); |
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return; |
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} |
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} |
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_cache[len] = NULL; |
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||
87 |
_listener_fun(_this_obj,_cache); |
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} |
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||
90 |
bool GrowableCache::equals(void* v, GrowableElement *e2) { |
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GrowableElement *e1 = (GrowableElement *) v; |
|
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assert(e1 != NULL, "e1 != NULL"); |
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assert(e2 != NULL, "e2 != NULL"); |
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||
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return e1->equals(e2); |
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} |
|
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||
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// |
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// class GrowableCache - public methods |
|
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// |
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||
102 |
GrowableCache::GrowableCache() { |
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_this_obj = NULL; |
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_listener_fun = NULL; |
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_elements = NULL; |
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_cache = NULL; |
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} |
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108 |
||
109 |
GrowableCache::~GrowableCache() { |
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clear(); |
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delete _elements; |
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FREE_C_HEAP_ARRAY(address, _cache); |
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} |
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||
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void GrowableCache::initialize(void *this_obj, void listener_fun(void *, address*) ) { |
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_this_obj = this_obj; |
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_listener_fun = listener_fun; |
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_elements = new (ResourceObj::C_HEAP) GrowableArray<GrowableElement*>(5,true); |
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recache(); |
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} |
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||
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// number of elements in the collection |
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int GrowableCache::length() { |
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return _elements->length(); |
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} |
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||
127 |
// get the value of the index element in the collection |
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GrowableElement* GrowableCache::at(int index) { |
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GrowableElement *e = (GrowableElement *) _elements->at(index); |
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130 |
assert(e != NULL, "e != NULL"); |
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return e; |
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} |
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133 |
||
134 |
int GrowableCache::find(GrowableElement* e) { |
|
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return _elements->find(e, GrowableCache::equals); |
|
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} |
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||
138 |
// append a copy of the element to the end of the collection |
|
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void GrowableCache::append(GrowableElement* e) { |
|
140 |
GrowableElement *new_e = e->clone(); |
|
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_elements->append(new_e); |
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recache(); |
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} |
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||
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// insert a copy of the element using lessthan() |
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void GrowableCache::insert(GrowableElement* e) { |
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GrowableElement *new_e = e->clone(); |
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_elements->append(new_e); |
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149 |
||
150 |
int n = length()-2; |
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for (int i=n; i>=0; i--) { |
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GrowableElement *e1 = _elements->at(i); |
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GrowableElement *e2 = _elements->at(i+1); |
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if (e2->lessThan(e1)) { |
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_elements->at_put(i+1, e1); |
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_elements->at_put(i, e2); |
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} |
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} |
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||
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recache(); |
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} |
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162 |
||
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// remove the element at index |
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164 |
void GrowableCache::remove (int index) { |
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GrowableElement *e = _elements->at(index); |
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assert(e != NULL, "e != NULL"); |
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_elements->remove(e); |
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delete e; |
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recache(); |
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} |
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171 |
||
172 |
// clear out all elements, release all heap space and |
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// let our listener know that things have changed. |
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174 |
void GrowableCache::clear() { |
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int len = _elements->length(); |
|
176 |
for (int i=0; i<len; i++) { |
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177 |
delete _elements->at(i); |
|
178 |
} |
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179 |
_elements->clear(); |
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recache(); |
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181 |
} |
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182 |
||
183 |
void GrowableCache::oops_do(OopClosure* f) { |
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184 |
int len = _elements->length(); |
|
185 |
for (int i=0; i<len; i++) { |
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186 |
GrowableElement *e = _elements->at(i); |
|
187 |
e->oops_do(f); |
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188 |
} |
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189 |
} |
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190 |
||
191 |
void GrowableCache::gc_epilogue() { |
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int len = _elements->length(); |
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193 |
// recompute the new cache value after GC |
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194 |
for (int i=0; i<len; i++) { |
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195 |
_cache[i] = _elements->at(i)->getCacheValue(); |
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196 |
} |
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197 |
} |
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198 |
||
199 |
// |
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200 |
// class JvmtiBreakpoint |
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// |
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202 |
||
203 |
JvmtiBreakpoint::JvmtiBreakpoint() { |
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204 |
_method = NULL; |
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205 |
_bci = 0; |
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206 |
#ifdef CHECK_UNHANDLED_OOPS |
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207 |
// This one is always allocated with new, but check it just in case. |
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Thread *thread = Thread::current(); |
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209 |
if (thread->is_in_stack((address)&_method)) { |
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210 |
thread->allow_unhandled_oop((oop*)&_method); |
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211 |
} |
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212 |
#endif // CHECK_UNHANDLED_OOPS |
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213 |
} |
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214 |
||
215 |
JvmtiBreakpoint::JvmtiBreakpoint(methodOop m_method, jlocation location) { |
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216 |
_method = m_method; |
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217 |
assert(_method != NULL, "_method != NULL"); |
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218 |
_bci = (int) location; |
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219 |
#ifdef CHECK_UNHANDLED_OOPS |
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220 |
// Could be allocated with new and wouldn't be on the unhandled oop list. |
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221 |
Thread *thread = Thread::current(); |
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222 |
if (thread->is_in_stack((address)&_method)) { |
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223 |
thread->allow_unhandled_oop(&_method); |
|
224 |
} |
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225 |
#endif // CHECK_UNHANDLED_OOPS |
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226 |
||
227 |
assert(_bci >= 0, "_bci >= 0"); |
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228 |
} |
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229 |
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230 |
void JvmtiBreakpoint::copy(JvmtiBreakpoint& bp) { |
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231 |
_method = bp._method; |
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232 |
_bci = bp._bci; |
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233 |
} |
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234 |
||
235 |
bool JvmtiBreakpoint::lessThan(JvmtiBreakpoint& bp) { |
|
236 |
Unimplemented(); |
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237 |
return false; |
|
238 |
} |
|
239 |
||
240 |
bool JvmtiBreakpoint::equals(JvmtiBreakpoint& bp) { |
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241 |
return _method == bp._method |
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242 |
&& _bci == bp._bci; |
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243 |
} |
|
244 |
||
245 |
bool JvmtiBreakpoint::is_valid() { |
|
246 |
return _method != NULL && |
|
247 |
_bci >= 0; |
|
248 |
} |
|
249 |
||
250 |
address JvmtiBreakpoint::getBcp() { |
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251 |
return _method->bcp_from(_bci); |
|
252 |
} |
|
253 |
||
254 |
void JvmtiBreakpoint::each_method_version_do(method_action meth_act) { |
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255 |
((methodOopDesc*)_method->*meth_act)(_bci); |
|
256 |
||
257 |
// add/remove breakpoint to/from versions of the method that |
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258 |
// are EMCP. Directly or transitively obsolete methods are |
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259 |
// not saved in the PreviousVersionInfo. |
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260 |
Thread *thread = Thread::current(); |
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261 |
instanceKlassHandle ikh = instanceKlassHandle(thread, _method->method_holder()); |
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262 |
symbolOop m_name = _method->name(); |
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263 |
symbolOop m_signature = _method->signature(); |
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264 |
||
265 |
{ |
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266 |
ResourceMark rm(thread); |
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267 |
// PreviousVersionInfo objects returned via PreviousVersionWalker |
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268 |
// contain a GrowableArray of handles. We have to clean up the |
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269 |
// GrowableArray _after_ the PreviousVersionWalker destructor |
|
270 |
// has destroyed the handles. |
|
271 |
{ |
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272 |
// search previous versions if they exist |
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273 |
PreviousVersionWalker pvw((instanceKlass *)ikh()->klass_part()); |
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274 |
for (PreviousVersionInfo * pv_info = pvw.next_previous_version(); |
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275 |
pv_info != NULL; pv_info = pvw.next_previous_version()) { |
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276 |
GrowableArray<methodHandle>* methods = |
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277 |
pv_info->prev_EMCP_method_handles(); |
|
278 |
||
279 |
if (methods == NULL) { |
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280 |
// We have run into a PreviousVersion generation where |
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281 |
// all methods were made obsolete during that generation's |
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282 |
// RedefineClasses() operation. At the time of that |
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283 |
// operation, all EMCP methods were flushed so we don't |
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284 |
// have to go back any further. |
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285 |
// |
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286 |
// A NULL methods array is different than an empty methods |
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287 |
// array. We cannot infer any optimizations about older |
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288 |
// generations from an empty methods array for the current |
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289 |
// generation. |
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290 |
break; |
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291 |
} |
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292 |
||
293 |
for (int i = methods->length() - 1; i >= 0; i--) { |
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294 |
methodHandle method = methods->at(i); |
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295 |
if (method->name() == m_name && method->signature() == m_signature) { |
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296 |
RC_TRACE(0x00000800, ("%sing breakpoint in %s(%s)", |
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297 |
meth_act == &methodOopDesc::set_breakpoint ? "sett" : "clear", |
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298 |
method->name()->as_C_string(), |
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299 |
method->signature()->as_C_string())); |
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300 |
assert(!method->is_obsolete(), "only EMCP methods here"); |
|
301 |
||
302 |
((methodOopDesc*)method()->*meth_act)(_bci); |
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303 |
break; |
|
304 |
} |
|
305 |
} |
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306 |
} |
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307 |
} // pvw is cleaned up |
|
308 |
} // rm is cleaned up |
|
309 |
} |
|
310 |
||
311 |
void JvmtiBreakpoint::set() { |
|
312 |
each_method_version_do(&methodOopDesc::set_breakpoint); |
|
313 |
} |
|
314 |
||
315 |
void JvmtiBreakpoint::clear() { |
|
316 |
each_method_version_do(&methodOopDesc::clear_breakpoint); |
|
317 |
} |
|
318 |
||
319 |
void JvmtiBreakpoint::print() { |
|
320 |
#ifndef PRODUCT |
|
321 |
const char *class_name = (_method == NULL) ? "NULL" : _method->klass_name()->as_C_string(); |
|
322 |
const char *method_name = (_method == NULL) ? "NULL" : _method->name()->as_C_string(); |
|
323 |
||
324 |
tty->print("Breakpoint(%s,%s,%d,%p)",class_name, method_name, _bci, getBcp()); |
|
325 |
#endif |
|
326 |
} |
|
327 |
||
328 |
||
329 |
// |
|
330 |
// class VM_ChangeBreakpoints |
|
331 |
// |
|
332 |
// Modify the Breakpoints data structure at a safepoint |
|
333 |
// |
|
334 |
||
335 |
void VM_ChangeBreakpoints::doit() { |
|
336 |
switch (_operation) { |
|
337 |
case SET_BREAKPOINT: |
|
338 |
_breakpoints->set_at_safepoint(*_bp); |
|
339 |
break; |
|
340 |
case CLEAR_BREAKPOINT: |
|
341 |
_breakpoints->clear_at_safepoint(*_bp); |
|
342 |
break; |
|
343 |
case CLEAR_ALL_BREAKPOINT: |
|
344 |
_breakpoints->clearall_at_safepoint(); |
|
345 |
break; |
|
346 |
default: |
|
347 |
assert(false, "Unknown operation"); |
|
348 |
} |
|
349 |
} |
|
350 |
||
351 |
void VM_ChangeBreakpoints::oops_do(OopClosure* f) { |
|
352 |
// This operation keeps breakpoints alive |
|
353 |
if (_breakpoints != NULL) { |
|
354 |
_breakpoints->oops_do(f); |
|
355 |
} |
|
356 |
if (_bp != NULL) { |
|
357 |
_bp->oops_do(f); |
|
358 |
} |
|
359 |
} |
|
360 |
||
361 |
// |
|
362 |
// class JvmtiBreakpoints |
|
363 |
// |
|
364 |
// a JVMTI internal collection of JvmtiBreakpoint |
|
365 |
// |
|
366 |
||
367 |
JvmtiBreakpoints::JvmtiBreakpoints(void listener_fun(void *,address *)) { |
|
368 |
_bps.initialize(this,listener_fun); |
|
369 |
} |
|
370 |
||
371 |
JvmtiBreakpoints:: ~JvmtiBreakpoints() {} |
|
372 |
||
373 |
void JvmtiBreakpoints::oops_do(OopClosure* f) { |
|
374 |
_bps.oops_do(f); |
|
375 |
} |
|
376 |
||
377 |
void JvmtiBreakpoints::gc_epilogue() { |
|
378 |
_bps.gc_epilogue(); |
|
379 |
} |
|
380 |
||
381 |
void JvmtiBreakpoints::print() { |
|
382 |
#ifndef PRODUCT |
|
383 |
ResourceMark rm; |
|
384 |
||
385 |
int n = _bps.length(); |
|
386 |
for (int i=0; i<n; i++) { |
|
387 |
JvmtiBreakpoint& bp = _bps.at(i); |
|
388 |
tty->print("%d: ", i); |
|
389 |
bp.print(); |
|
390 |
tty->print_cr(""); |
|
391 |
} |
|
392 |
#endif |
|
393 |
} |
|
394 |
||
395 |
||
396 |
void JvmtiBreakpoints::set_at_safepoint(JvmtiBreakpoint& bp) { |
|
397 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
398 |
||
399 |
int i = _bps.find(bp); |
|
400 |
if (i == -1) { |
|
401 |
_bps.append(bp); |
|
402 |
bp.set(); |
|
403 |
} |
|
404 |
} |
|
405 |
||
406 |
void JvmtiBreakpoints::clear_at_safepoint(JvmtiBreakpoint& bp) { |
|
407 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
408 |
||
409 |
int i = _bps.find(bp); |
|
410 |
if (i != -1) { |
|
411 |
_bps.remove(i); |
|
412 |
bp.clear(); |
|
413 |
} |
|
414 |
} |
|
415 |
||
416 |
void JvmtiBreakpoints::clearall_at_safepoint() { |
|
417 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
418 |
||
419 |
int len = _bps.length(); |
|
420 |
for (int i=0; i<len; i++) { |
|
421 |
_bps.at(i).clear(); |
|
422 |
} |
|
423 |
_bps.clear(); |
|
424 |
} |
|
425 |
||
426 |
int JvmtiBreakpoints::length() { return _bps.length(); } |
|
427 |
||
428 |
int JvmtiBreakpoints::set(JvmtiBreakpoint& bp) { |
|
429 |
if ( _bps.find(bp) != -1) { |
|
430 |
return JVMTI_ERROR_DUPLICATE; |
|
431 |
} |
|
432 |
VM_ChangeBreakpoints set_breakpoint(this,VM_ChangeBreakpoints::SET_BREAKPOINT, &bp); |
|
433 |
VMThread::execute(&set_breakpoint); |
|
434 |
return JVMTI_ERROR_NONE; |
|
435 |
} |
|
436 |
||
437 |
int JvmtiBreakpoints::clear(JvmtiBreakpoint& bp) { |
|
438 |
if ( _bps.find(bp) == -1) { |
|
439 |
return JVMTI_ERROR_NOT_FOUND; |
|
440 |
} |
|
441 |
||
442 |
VM_ChangeBreakpoints clear_breakpoint(this,VM_ChangeBreakpoints::CLEAR_BREAKPOINT, &bp); |
|
443 |
VMThread::execute(&clear_breakpoint); |
|
444 |
return JVMTI_ERROR_NONE; |
|
445 |
} |
|
446 |
||
447 |
void JvmtiBreakpoints::clearall_in_class_at_safepoint(klassOop klass) { |
|
448 |
bool changed = true; |
|
449 |
// We are going to run thru the list of bkpts |
|
450 |
// and delete some. This deletion probably alters |
|
451 |
// the list in some implementation defined way such |
|
452 |
// that when we delete entry i, the next entry might |
|
453 |
// no longer be at i+1. To be safe, each time we delete |
|
454 |
// an entry, we'll just start again from the beginning. |
|
455 |
// We'll stop when we make a pass thru the whole list without |
|
456 |
// deleting anything. |
|
457 |
while (changed) { |
|
458 |
int len = _bps.length(); |
|
459 |
changed = false; |
|
460 |
for (int i = 0; i < len; i++) { |
|
461 |
JvmtiBreakpoint& bp = _bps.at(i); |
|
462 |
if (bp.method()->method_holder() == klass) { |
|
463 |
bp.clear(); |
|
464 |
_bps.remove(i); |
|
465 |
// This changed 'i' so we have to start over. |
|
466 |
changed = true; |
|
467 |
break; |
|
468 |
} |
|
469 |
} |
|
470 |
} |
|
471 |
} |
|
472 |
||
473 |
void JvmtiBreakpoints::clearall() { |
|
474 |
VM_ChangeBreakpoints clearall_breakpoint(this,VM_ChangeBreakpoints::CLEAR_ALL_BREAKPOINT); |
|
475 |
VMThread::execute(&clearall_breakpoint); |
|
476 |
} |
|
477 |
||
478 |
// |
|
479 |
// class JvmtiCurrentBreakpoints |
|
480 |
// |
|
481 |
||
482 |
JvmtiBreakpoints *JvmtiCurrentBreakpoints::_jvmti_breakpoints = NULL; |
|
483 |
address * JvmtiCurrentBreakpoints::_breakpoint_list = NULL; |
|
484 |
||
485 |
||
486 |
JvmtiBreakpoints& JvmtiCurrentBreakpoints::get_jvmti_breakpoints() { |
|
487 |
if (_jvmti_breakpoints != NULL) return (*_jvmti_breakpoints); |
|
488 |
_jvmti_breakpoints = new JvmtiBreakpoints(listener_fun); |
|
489 |
assert(_jvmti_breakpoints != NULL, "_jvmti_breakpoints != NULL"); |
|
490 |
return (*_jvmti_breakpoints); |
|
491 |
} |
|
492 |
||
493 |
void JvmtiCurrentBreakpoints::listener_fun(void *this_obj, address *cache) { |
|
494 |
JvmtiBreakpoints *this_jvmti = (JvmtiBreakpoints *) this_obj; |
|
495 |
assert(this_jvmti != NULL, "this_jvmti != NULL"); |
|
496 |
||
497 |
debug_only(int n = this_jvmti->length();); |
|
498 |
assert(cache[n] == NULL, "cache must be NULL terminated"); |
|
499 |
||
500 |
set_breakpoint_list(cache); |
|
501 |
} |
|
502 |
||
503 |
||
504 |
void JvmtiCurrentBreakpoints::oops_do(OopClosure* f) { |
|
505 |
if (_jvmti_breakpoints != NULL) { |
|
506 |
_jvmti_breakpoints->oops_do(f); |
|
507 |
} |
|
508 |
} |
|
509 |
||
510 |
void JvmtiCurrentBreakpoints::gc_epilogue() { |
|
511 |
if (_jvmti_breakpoints != NULL) { |
|
512 |
_jvmti_breakpoints->gc_epilogue(); |
|
513 |
} |
|
514 |
} |
|
515 |
||
516 |
||
517 |
/////////////////////////////////////////////////////////////// |
|
518 |
// |
|
519 |
// class VM_GetOrSetLocal |
|
520 |
// |
|
521 |
||
522 |
// Constructor for non-object getter |
|
523 |
VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type) |
|
524 |
: _thread(thread) |
|
525 |
, _calling_thread(NULL) |
|
526 |
, _depth(depth) |
|
527 |
, _index(index) |
|
528 |
, _type(type) |
|
529 |
, _set(false) |
|
530 |
, _jvf(NULL) |
|
531 |
, _result(JVMTI_ERROR_NONE) |
|
532 |
{ |
|
533 |
} |
|
534 |
||
535 |
// Constructor for object or non-object setter |
|
536 |
VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, jint depth, int index, BasicType type, jvalue value) |
|
537 |
: _thread(thread) |
|
538 |
, _calling_thread(NULL) |
|
539 |
, _depth(depth) |
|
540 |
, _index(index) |
|
541 |
, _type(type) |
|
542 |
, _value(value) |
|
543 |
, _set(true) |
|
544 |
, _jvf(NULL) |
|
545 |
, _result(JVMTI_ERROR_NONE) |
|
546 |
{ |
|
547 |
} |
|
548 |
||
549 |
// Constructor for object getter |
|
550 |
VM_GetOrSetLocal::VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth, int index) |
|
551 |
: _thread(thread) |
|
552 |
, _calling_thread(calling_thread) |
|
553 |
, _depth(depth) |
|
554 |
, _index(index) |
|
555 |
, _type(T_OBJECT) |
|
556 |
, _set(false) |
|
557 |
, _jvf(NULL) |
|
558 |
, _result(JVMTI_ERROR_NONE) |
|
559 |
{ |
|
560 |
} |
|
561 |
||
562 |
||
563 |
vframe *VM_GetOrSetLocal::get_vframe() { |
|
564 |
if (!_thread->has_last_Java_frame()) { |
|
565 |
return NULL; |
|
566 |
} |
|
567 |
RegisterMap reg_map(_thread); |
|
568 |
vframe *vf = _thread->last_java_vframe(®_map); |
|
569 |
int d = 0; |
|
570 |
while ((vf != NULL) && (d < _depth)) { |
|
571 |
vf = vf->java_sender(); |
|
572 |
d++; |
|
573 |
} |
|
574 |
return vf; |
|
575 |
} |
|
576 |
||
577 |
javaVFrame *VM_GetOrSetLocal::get_java_vframe() { |
|
578 |
vframe* vf = get_vframe(); |
|
579 |
if (vf == NULL) { |
|
580 |
_result = JVMTI_ERROR_NO_MORE_FRAMES; |
|
581 |
return NULL; |
|
582 |
} |
|
583 |
javaVFrame *jvf = (javaVFrame*)vf; |
|
584 |
||
585 |
if (!vf->is_java_frame() || jvf->method()->is_native()) { |
|
586 |
_result = JVMTI_ERROR_OPAQUE_FRAME; |
|
587 |
return NULL; |
|
588 |
} |
|
589 |
return jvf; |
|
590 |
} |
|
591 |
||
592 |
// Check that the klass is assignable to a type with the given signature. |
|
593 |
// Another solution could be to use the function Klass::is_subtype_of(type). |
|
594 |
// But the type class can be forced to load/initialize eagerly in such a case. |
|
595 |
// This may cause unexpected consequences like CFLH or class-init JVMTI events. |
|
596 |
// It is better to avoid such a behavior. |
|
597 |
bool VM_GetOrSetLocal::is_assignable(const char* ty_sign, Klass* klass, Thread* thread) { |
|
598 |
assert(ty_sign != NULL, "type signature must not be NULL"); |
|
599 |
assert(thread != NULL, "thread must not be NULL"); |
|
600 |
assert(klass != NULL, "klass must not be NULL"); |
|
601 |
||
602 |
int len = (int) strlen(ty_sign); |
|
603 |
if (ty_sign[0] == 'L' && ty_sign[len-1] == ';') { // Need pure class/interface name |
|
604 |
ty_sign++; |
|
605 |
len -= 2; |
|
606 |
} |
|
607 |
symbolHandle ty_sym = oopFactory::new_symbol_handle(ty_sign, len, thread); |
|
608 |
if (klass->name() == ty_sym()) { |
|
609 |
return true; |
|
610 |
} |
|
611 |
// Compare primary supers |
|
612 |
int super_depth = klass->super_depth(); |
|
613 |
int idx; |
|
614 |
for (idx = 0; idx < super_depth; idx++) { |
|
615 |
if (Klass::cast(klass->primary_super_of_depth(idx))->name() == ty_sym()) { |
|
616 |
return true; |
|
617 |
} |
|
618 |
} |
|
619 |
// Compare secondary supers |
|
620 |
objArrayOop sec_supers = klass->secondary_supers(); |
|
621 |
for (idx = 0; idx < sec_supers->length(); idx++) { |
|
622 |
if (Klass::cast((klassOop) sec_supers->obj_at(idx))->name() == ty_sym()) { |
|
623 |
return true; |
|
624 |
} |
|
625 |
} |
|
626 |
return false; |
|
627 |
} |
|
628 |
||
629 |
// Checks error conditions: |
|
630 |
// JVMTI_ERROR_INVALID_SLOT |
|
631 |
// JVMTI_ERROR_TYPE_MISMATCH |
|
632 |
// Returns: 'true' - everything is Ok, 'false' - error code |
|
633 |
||
634 |
bool VM_GetOrSetLocal::check_slot_type(javaVFrame* jvf) { |
|
635 |
methodOop method_oop = jvf->method(); |
|
636 |
if (!method_oop->has_localvariable_table()) { |
|
637 |
// Just to check index boundaries |
|
638 |
jint extra_slot = (_type == T_LONG || _type == T_DOUBLE) ? 1 : 0; |
|
639 |
if (_index < 0 || _index + extra_slot >= method_oop->max_locals()) { |
|
640 |
_result = JVMTI_ERROR_INVALID_SLOT; |
|
641 |
return false; |
|
642 |
} |
|
643 |
return true; |
|
644 |
} |
|
645 |
||
646 |
jint num_entries = method_oop->localvariable_table_length(); |
|
647 |
if (num_entries == 0) { |
|
648 |
_result = JVMTI_ERROR_INVALID_SLOT; |
|
649 |
return false; // There are no slots |
|
650 |
} |
|
651 |
int signature_idx = -1; |
|
652 |
int vf_bci = jvf->bci(); |
|
653 |
LocalVariableTableElement* table = method_oop->localvariable_table_start(); |
|
654 |
for (int i = 0; i < num_entries; i++) { |
|
655 |
int start_bci = table[i].start_bci; |
|
656 |
int end_bci = start_bci + table[i].length; |
|
657 |
||
658 |
// Here we assume that locations of LVT entries |
|
659 |
// with the same slot number cannot be overlapped |
|
660 |
if (_index == (jint) table[i].slot && start_bci <= vf_bci && vf_bci <= end_bci) { |
|
661 |
signature_idx = (int) table[i].descriptor_cp_index; |
|
662 |
break; |
|
663 |
} |
|
664 |
} |
|
665 |
if (signature_idx == -1) { |
|
666 |
_result = JVMTI_ERROR_INVALID_SLOT; |
|
667 |
return false; // Incorrect slot index |
|
668 |
} |
|
669 |
symbolOop sign_sym = method_oop->constants()->symbol_at(signature_idx); |
|
670 |
const char* signature = (const char *) sign_sym->as_utf8(); |
|
671 |
BasicType slot_type = char2type(signature[0]); |
|
672 |
||
673 |
switch (slot_type) { |
|
674 |
case T_BYTE: |
|
675 |
case T_SHORT: |
|
676 |
case T_CHAR: |
|
677 |
case T_BOOLEAN: |
|
678 |
slot_type = T_INT; |
|
679 |
break; |
|
680 |
case T_ARRAY: |
|
681 |
slot_type = T_OBJECT; |
|
682 |
break; |
|
683 |
}; |
|
684 |
if (_type != slot_type) { |
|
685 |
_result = JVMTI_ERROR_TYPE_MISMATCH; |
|
686 |
return false; |
|
687 |
} |
|
688 |
||
689 |
jobject jobj = _value.l; |
|
690 |
if (_set && slot_type == T_OBJECT && jobj != NULL) { // NULL reference is allowed |
|
691 |
// Check that the jobject class matches the return type signature. |
|
692 |
JavaThread* cur_thread = JavaThread::current(); |
|
693 |
HandleMark hm(cur_thread); |
|
694 |
||
695 |
Handle obj = Handle(cur_thread, JNIHandles::resolve_external_guard(jobj)); |
|
696 |
NULL_CHECK(obj, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); |
|
697 |
KlassHandle ob_kh = KlassHandle(cur_thread, obj->klass()); |
|
698 |
NULL_CHECK(ob_kh, (_result = JVMTI_ERROR_INVALID_OBJECT, false)); |
|
699 |
||
700 |
if (!is_assignable(signature, Klass::cast(ob_kh()), cur_thread)) { |
|
701 |
_result = JVMTI_ERROR_TYPE_MISMATCH; |
|
702 |
return false; |
|
703 |
} |
|
704 |
} |
|
705 |
return true; |
|
706 |
} |
|
707 |
||
708 |
static bool can_be_deoptimized(vframe* vf) { |
|
709 |
return (vf->is_compiled_frame() && vf->fr().can_be_deoptimized()); |
|
710 |
} |
|
711 |
||
712 |
bool VM_GetOrSetLocal::doit_prologue() { |
|
713 |
_jvf = get_java_vframe(); |
|
714 |
NULL_CHECK(_jvf, false); |
|
715 |
||
716 |
if (!check_slot_type(_jvf)) { |
|
717 |
return false; |
|
718 |
} |
|
719 |
return true; |
|
720 |
} |
|
721 |
||
722 |
void VM_GetOrSetLocal::doit() { |
|
723 |
if (_set) { |
|
724 |
// Force deoptimization of frame if compiled because it's |
|
725 |
// possible the compiler emitted some locals as constant values, |
|
726 |
// meaning they are not mutable. |
|
727 |
if (can_be_deoptimized(_jvf)) { |
|
728 |
||
729 |
// Schedule deoptimization so that eventually the local |
|
730 |
// update will be written to an interpreter frame. |
|
731 |
VM_DeoptimizeFrame deopt(_jvf->thread(), _jvf->fr().id()); |
|
732 |
VMThread::execute(&deopt); |
|
733 |
||
734 |
// Now store a new value for the local which will be applied |
|
735 |
// once deoptimization occurs. Note however that while this |
|
736 |
// write is deferred until deoptimization actually happens |
|
737 |
// can vframe created after this point will have its locals |
|
738 |
// reflecting this update so as far as anyone can see the |
|
739 |
// write has already taken place. |
|
740 |
||
741 |
// If we are updating an oop then get the oop from the handle |
|
742 |
// since the handle will be long gone by the time the deopt |
|
743 |
// happens. The oop stored in the deferred local will be |
|
744 |
// gc'd on its own. |
|
745 |
if (_type == T_OBJECT) { |
|
746 |
_value.l = (jobject) (JNIHandles::resolve_external_guard(_value.l)); |
|
747 |
} |
|
748 |
// Re-read the vframe so we can see that it is deoptimized |
|
749 |
// [ Only need because of assert in update_local() ] |
|
750 |
_jvf = get_java_vframe(); |
|
751 |
((compiledVFrame*)_jvf)->update_local(_type, _index, _value); |
|
752 |
return; |
|
753 |
} |
|
754 |
StackValueCollection *locals = _jvf->locals(); |
|
755 |
HandleMark hm; |
|
756 |
||
757 |
switch (_type) { |
|
758 |
case T_INT: locals->set_int_at (_index, _value.i); break; |
|
759 |
case T_LONG: locals->set_long_at (_index, _value.j); break; |
|
760 |
case T_FLOAT: locals->set_float_at (_index, _value.f); break; |
|
761 |
case T_DOUBLE: locals->set_double_at(_index, _value.d); break; |
|
762 |
case T_OBJECT: { |
|
763 |
Handle ob_h(JNIHandles::resolve_external_guard(_value.l)); |
|
764 |
locals->set_obj_at (_index, ob_h); |
|
765 |
break; |
|
766 |
} |
|
767 |
default: ShouldNotReachHere(); |
|
768 |
} |
|
769 |
_jvf->set_locals(locals); |
|
770 |
} else { |
|
771 |
StackValueCollection *locals = _jvf->locals(); |
|
772 |
||
773 |
if (locals->at(_index)->type() == T_CONFLICT) { |
|
774 |
memset(&_value, 0, sizeof(_value)); |
|
775 |
_value.l = NULL; |
|
776 |
return; |
|
777 |
} |
|
778 |
||
779 |
switch (_type) { |
|
780 |
case T_INT: _value.i = locals->int_at (_index); break; |
|
781 |
case T_LONG: _value.j = locals->long_at (_index); break; |
|
782 |
case T_FLOAT: _value.f = locals->float_at (_index); break; |
|
783 |
case T_DOUBLE: _value.d = locals->double_at(_index); break; |
|
784 |
case T_OBJECT: { |
|
785 |
// Wrap the oop to be returned in a local JNI handle since |
|
786 |
// oops_do() no longer applies after doit() is finished. |
|
787 |
oop obj = locals->obj_at(_index)(); |
|
788 |
_value.l = JNIHandles::make_local(_calling_thread, obj); |
|
789 |
break; |
|
790 |
} |
|
791 |
default: ShouldNotReachHere(); |
|
792 |
} |
|
793 |
} |
|
794 |
} |
|
795 |
||
796 |
||
797 |
bool VM_GetOrSetLocal::allow_nested_vm_operations() const { |
|
798 |
return true; // May need to deoptimize |
|
799 |
} |
|
800 |
||
801 |
||
802 |
///////////////////////////////////////////////////////////////////////////////////////// |
|
803 |
||
804 |
// |
|
805 |
// class JvmtiSuspendControl - see comments in jvmtiImpl.hpp |
|
806 |
// |
|
807 |
||
808 |
bool JvmtiSuspendControl::suspend(JavaThread *java_thread) { |
|
809 |
// external suspend should have caught suspending a thread twice |
|
810 |
||
811 |
// Immediate suspension required for JPDA back-end so JVMTI agent threads do |
|
812 |
// not deadlock due to later suspension on transitions while holding |
|
813 |
// raw monitors. Passing true causes the immediate suspension. |
|
814 |
// java_suspend() will catch threads in the process of exiting |
|
815 |
// and will ignore them. |
|
816 |
java_thread->java_suspend(); |
|
817 |
||
818 |
// It would be nice to have the following assertion in all the time, |
|
819 |
// but it is possible for a racing resume request to have resumed |
|
820 |
// this thread right after we suspended it. Temporarily enable this |
|
821 |
// assertion if you are chasing a different kind of bug. |
|
822 |
// |
|
823 |
// assert(java_lang_Thread::thread(java_thread->threadObj()) == NULL || |
|
824 |
// java_thread->is_being_ext_suspended(), "thread is not suspended"); |
|
825 |
||
826 |
if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) { |
|
827 |
// check again because we can get delayed in java_suspend(): |
|
828 |
// the thread is in process of exiting. |
|
829 |
return false; |
|
830 |
} |
|
831 |
||
832 |
return true; |
|
833 |
} |
|
834 |
||
835 |
bool JvmtiSuspendControl::resume(JavaThread *java_thread) { |
|
836 |
// external suspend should have caught resuming a thread twice |
|
837 |
assert(java_thread->is_being_ext_suspended(), "thread should be suspended"); |
|
838 |
||
839 |
// resume thread |
|
840 |
{ |
|
841 |
// must always grab Threads_lock, see JVM_SuspendThread |
|
842 |
MutexLocker ml(Threads_lock); |
|
843 |
java_thread->java_resume(); |
|
844 |
} |
|
845 |
||
846 |
return true; |
|
847 |
} |
|
848 |
||
849 |
||
850 |
void JvmtiSuspendControl::print() { |
|
851 |
#ifndef PRODUCT |
|
852 |
MutexLocker mu(Threads_lock); |
|
853 |
ResourceMark rm; |
|
854 |
||
855 |
tty->print("Suspended Threads: ["); |
|
856 |
for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) { |
|
857 |
#if JVMTI_TRACE |
|
858 |
const char *name = JvmtiTrace::safe_get_thread_name(thread); |
|
859 |
#else |
|
860 |
const char *name = ""; |
|
861 |
#endif /*JVMTI_TRACE */ |
|
862 |
tty->print("%s(%c ", name, thread->is_being_ext_suspended() ? 'S' : '_'); |
|
863 |
if (!thread->has_last_Java_frame()) { |
|
864 |
tty->print("no stack"); |
|
865 |
} |
|
866 |
tty->print(") "); |
|
867 |
} |
|
868 |
tty->print_cr("]"); |
|
869 |
#endif |
|
870 |
} |