duke@435: /*
mikael@4153:  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "code/codeBlob.hpp"
stefank@2314: #include "code/codeCache.hpp"
stefank@2314: #include "code/scopeDesc.hpp"
stefank@2314: #include "memory/resourceArea.hpp"
stefank@2314: #include "oops/oop.inline.hpp"
stefank@2314: #include "prims/jvmtiCodeBlobEvents.hpp"
stefank@2314: #include "prims/jvmtiExport.hpp"
stefank@2314: #include "runtime/handles.hpp"
stefank@2314: #include "runtime/handles.inline.hpp"
stefank@2314: #include "runtime/vmThread.hpp"
duke@435: 
duke@435: // Support class to collect a list of the non-nmethod CodeBlobs in
duke@435: // the CodeCache.
duke@435: //
duke@435: // This class actually creates a list of JvmtiCodeBlobDesc - each JvmtiCodeBlobDesc
duke@435: // describes a single CodeBlob in the CodeCache. Note that collection is
duke@435: // done to a static list - this is because CodeCache::blobs_do is defined
duke@435: // as void CodeCache::blobs_do(void f(CodeBlob* nm)) and hence requires
duke@435: // a C or static method.
duke@435: //
duke@435: // Usage :-
duke@435: //
duke@435: // CodeBlobCollector collector;
duke@435: //
duke@435: // collector.collect();
duke@435: // JvmtiCodeBlobDesc* blob = collector.first();
duke@435: // while (blob != NULL) {
duke@435: //   :
duke@435: //   blob = collector.next();
duke@435: // }
duke@435: //
duke@435: 
duke@435: class CodeBlobCollector : StackObj {
duke@435:  private:
duke@435:   GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs;   // collected blobs
duke@435:   int _pos;                                         // iterator position
duke@435: 
duke@435:   // used during a collection
duke@435:   static GrowableArray<JvmtiCodeBlobDesc*>* _global_code_blobs;
duke@435:   static void do_blob(CodeBlob* cb);
duke@435:  public:
duke@435:   CodeBlobCollector() {
duke@435:     _code_blobs = NULL;
duke@435:     _pos = -1;
duke@435:   }
duke@435:   ~CodeBlobCollector() {
duke@435:     if (_code_blobs != NULL) {
duke@435:       for (int i=0; i<_code_blobs->length(); i++) {
duke@435:         FreeHeap(_code_blobs->at(i));
duke@435:       }
duke@435:       delete _code_blobs;
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   // collect list of code blobs in the cache
duke@435:   void collect();
duke@435: 
duke@435:   // iteration support - return first code blob
duke@435:   JvmtiCodeBlobDesc* first() {
duke@435:     assert(_code_blobs != NULL, "not collected");
duke@435:     if (_code_blobs->length() == 0) {
duke@435:       return NULL;
duke@435:     }
duke@435:     _pos = 0;
duke@435:     return _code_blobs->at(0);
duke@435:   }
duke@435: 
duke@435:   // iteration support - return next code blob
duke@435:   JvmtiCodeBlobDesc* next() {
duke@435:     assert(_pos >= 0, "iteration not started");
duke@435:     if (_pos+1 >= _code_blobs->length()) {
duke@435:       return NULL;
duke@435:     }
duke@435:     return _code_blobs->at(++_pos);
duke@435:   }
duke@435: 
duke@435: };
duke@435: 
duke@435: // used during collection
duke@435: GrowableArray<JvmtiCodeBlobDesc*>* CodeBlobCollector::_global_code_blobs;
duke@435: 
duke@435: 
duke@435: // called for each CodeBlob in the CodeCache
duke@435: //
duke@435: // This function filters out nmethods as it is only interested in
duke@435: // other CodeBlobs. This function also filters out CodeBlobs that have
duke@435: // a duplicate starting address as previous blobs. This is needed to
duke@435: // handle the case where multiple stubs are generated into a single
duke@435: // BufferBlob.
duke@435: 
duke@435: void CodeBlobCollector::do_blob(CodeBlob* cb) {
duke@435: 
duke@435:   // ignore nmethods
duke@435:   if (cb->is_nmethod()) {
duke@435:     return;
duke@435:   }
duke@435: 
duke@435:   // check if this starting address has been seen already - the
duke@435:   // assumption is that stubs are inserted into the list before the
duke@435:   // enclosing BufferBlobs.
twisti@2103:   address addr = cb->code_begin();
duke@435:   for (int i=0; i<_global_code_blobs->length(); i++) {
duke@435:     JvmtiCodeBlobDesc* scb = _global_code_blobs->at(i);
duke@435:     if (addr == scb->code_begin()) {
duke@435:       return;
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   // record the CodeBlob details as a JvmtiCodeBlobDesc
twisti@2103:   JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(cb->name(), cb->code_begin(), cb->code_end());
duke@435:   _global_code_blobs->append(scb);
duke@435: }
duke@435: 
duke@435: 
duke@435: // collects a list of CodeBlobs in the CodeCache.
duke@435: //
duke@435: // The created list is growable array of JvmtiCodeBlobDesc - each one describes
duke@435: // a CodeBlob. Note that the list is static - this is because CodeBlob::blobs_do
duke@435: // requires a a C or static function so we can't use an instance function. This
duke@435: // isn't a problem as the iteration is serial anyway as we need the CodeCache_lock
duke@435: // to iterate over the code cache.
duke@435: //
duke@435: // Note that the CodeBlobs in the CodeCache will include BufferBlobs that may
duke@435: // contain multiple stubs. As a profiler is interested in the stubs rather than
duke@435: // the enclosing container we first iterate over the stub code descriptors so
duke@435: // that the stubs go into the list first. do_blob will then filter out the
duke@435: // enclosing blobs if the starting address of the enclosing blobs matches the
duke@435: // starting address of first stub generated in the enclosing blob.
duke@435: 
duke@435: void CodeBlobCollector::collect() {
duke@435:   assert_locked_or_safepoint(CodeCache_lock);
duke@435:   assert(_global_code_blobs == NULL, "checking");
duke@435: 
duke@435:   // create the global list
zgu@3900:   _global_code_blobs = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JvmtiCodeBlobDesc*>(50,true);
duke@435: 
duke@435:   // iterate over the stub code descriptors and put them in the list first.
duke@435:   int index = 0;
duke@435:   StubCodeDesc* desc;
duke@435:   while ((desc = StubCodeDesc::desc_for_index(++index)) != NULL) {
duke@435:     _global_code_blobs->append(new JvmtiCodeBlobDesc(desc->name(), desc->begin(), desc->end()));
duke@435:   }
duke@435: 
duke@435:   // next iterate over all the non-nmethod code blobs and add them to
duke@435:   // the list - as noted above this will filter out duplicates and
duke@435:   // enclosing blobs.
duke@435:   CodeCache::blobs_do(do_blob);
duke@435: 
duke@435:   // make the global list the instance list so that it can be used
duke@435:   // for other iterations.
duke@435:   _code_blobs = _global_code_blobs;
duke@435:   _global_code_blobs = NULL;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Generate a DYNAMIC_CODE_GENERATED event for each non-nmethod code blob.
duke@435: 
duke@435: jvmtiError JvmtiCodeBlobEvents::generate_dynamic_code_events(JvmtiEnv* env) {
duke@435:   CodeBlobCollector collector;
duke@435: 
never@1988:   // First collect all the code blobs.  This has to be done in a
never@1988:   // single pass over the code cache with CodeCache_lock held because
never@1988:   // there isn't any safe way to iterate over regular CodeBlobs since
never@1988:   // they can be freed at any point.
duke@435:   {
duke@435:     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
duke@435:     collector.collect();
duke@435:   }
duke@435: 
duke@435:   // iterate over the collected list and post an event for each blob
duke@435:   JvmtiCodeBlobDesc* blob = collector.first();
duke@435:   while (blob != NULL) {
duke@435:     JvmtiExport::post_dynamic_code_generated(env, blob->name(), blob->code_begin(), blob->code_end());
duke@435:     blob = collector.next();
duke@435:   }
duke@435:   return JVMTI_ERROR_NONE;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Generate a COMPILED_METHOD_LOAD event for each nnmethod
duke@435: jvmtiError JvmtiCodeBlobEvents::generate_compiled_method_load_events(JvmtiEnv* env) {
duke@435:   HandleMark hm;
duke@435: 
never@1988:   // Walk the CodeCache notifying for live nmethods.  The code cache
never@1988:   // may be changing while this is happening which is ok since newly
never@1988:   // created nmethod will notify normally and nmethods which are freed
never@1988:   // can be safely skipped.
never@1988:   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
never@1988:   nmethod* current = CodeCache::first_nmethod();
never@1988:   while (current != NULL) {
never@1988:     // Only notify for live nmethods
never@1988:     if (current->is_alive()) {
never@2004:       // Lock the nmethod so it can't be freed
never@2004:       nmethodLocker nml(current);
never@2004: 
never@1988:       // Don't hold the lock over the notify or jmethodID creation
never@1988:       MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
never@1988:       current->get_and_cache_jmethod_id();
never@1988:       JvmtiExport::post_compiled_method_load(current);
never@1988:     }
never@1988:     current = CodeCache::next_nmethod(current);
duke@435:   }
duke@435:   return JVMTI_ERROR_NONE;
duke@435: }
duke@435: 
duke@435: 
duke@435: // create a C-heap allocated address location map for an nmethod
duke@435: void JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nmethod *nm,
duke@435:                                                         jvmtiAddrLocationMap** map_ptr,
duke@435:                                                         jint *map_length_ptr)
duke@435: {
duke@435:   ResourceMark rm;
duke@435:   jvmtiAddrLocationMap* map = NULL;
duke@435:   jint map_length = 0;
duke@435: 
duke@435: 
duke@435:   // Generate line numbers using PcDesc and ScopeDesc info
duke@435:   methodHandle mh(nm->method());
duke@435: 
duke@435:   if (!mh->is_native()) {
duke@435:     PcDesc *pcd;
duke@435:     int pcds_in_method;
duke@435: 
duke@435:     pcds_in_method = (nm->scopes_pcs_end() - nm->scopes_pcs_begin());
zgu@3900:     map = NEW_C_HEAP_ARRAY(jvmtiAddrLocationMap, pcds_in_method, mtInternal);
duke@435: 
duke@435:     address scopes_data = nm->scopes_data_begin();
duke@435:     for( pcd = nm->scopes_pcs_begin(); pcd < nm->scopes_pcs_end(); ++pcd ) {
kvn@1688:       ScopeDesc sc0(nm, pcd->scope_decode_offset(), pcd->should_reexecute(), pcd->return_oop());
duke@435:       ScopeDesc *sd  = &sc0;
duke@435:       while( !sd->is_top() ) { sd = sd->sender(); }
duke@435:       int bci = sd->bci();
duke@435:       if (bci != InvocationEntryBci) {
duke@435:         assert(map_length < pcds_in_method, "checking");
duke@435:         map[map_length].start_address = (const void*)pcd->real_pc(nm);
duke@435:         map[map_length].location = bci;
duke@435:         ++map_length;
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   *map_ptr = map;
duke@435:   *map_length_ptr = map_length;
duke@435: }