diff -r 000000000000 -r f90c822e73f8 src/share/vm/prims/jvmtiCodeBlobEvents.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/prims/jvmtiCodeBlobEvents.cpp Wed Apr 27 01:25:04 2016 +0800 @@ -0,0 +1,286 @@ +/* + * Copyright (c) 2003, 2012, 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 + * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "code/codeBlob.hpp" +#include "code/codeCache.hpp" +#include "code/scopeDesc.hpp" +#include "code/vtableStubs.hpp" +#include "memory/resourceArea.hpp" +#include "oops/oop.inline.hpp" +#include "prims/jvmtiCodeBlobEvents.hpp" +#include "prims/jvmtiExport.hpp" +#include "runtime/handles.hpp" +#include "runtime/handles.inline.hpp" +#include "runtime/vmThread.hpp" + +// Support class to collect a list of the non-nmethod CodeBlobs in +// the CodeCache. +// +// This class actually creates a list of JvmtiCodeBlobDesc - each JvmtiCodeBlobDesc +// describes a single CodeBlob in the CodeCache. Note that collection is +// done to a static list - this is because CodeCache::blobs_do is defined +// as void CodeCache::blobs_do(void f(CodeBlob* nm)) and hence requires +// a C or static method. +// +// Usage :- +// +// CodeBlobCollector collector; +// +// collector.collect(); +// JvmtiCodeBlobDesc* blob = collector.first(); +// while (blob != NULL) { +// : +// blob = collector.next(); +// } +// + +class CodeBlobCollector : StackObj { + private: + GrowableArray* _code_blobs; // collected blobs + int _pos; // iterator position + + // used during a collection + static GrowableArray* _global_code_blobs; + static void do_blob(CodeBlob* cb); + static void do_vtable_stub(VtableStub* vs); + public: + CodeBlobCollector() { + _code_blobs = NULL; + _pos = -1; + } + ~CodeBlobCollector() { + if (_code_blobs != NULL) { + for (int i=0; i<_code_blobs->length(); i++) { + FreeHeap(_code_blobs->at(i)); + } + delete _code_blobs; + } + } + + // collect list of code blobs in the cache + void collect(); + + // iteration support - return first code blob + JvmtiCodeBlobDesc* first() { + assert(_code_blobs != NULL, "not collected"); + if (_code_blobs->length() == 0) { + return NULL; + } + _pos = 0; + return _code_blobs->at(0); + } + + // iteration support - return next code blob + JvmtiCodeBlobDesc* next() { + assert(_pos >= 0, "iteration not started"); + if (_pos+1 >= _code_blobs->length()) { + return NULL; + } + return _code_blobs->at(++_pos); + } + +}; + +// used during collection +GrowableArray* CodeBlobCollector::_global_code_blobs; + + +// called for each CodeBlob in the CodeCache +// +// This function filters out nmethods as it is only interested in +// other CodeBlobs. This function also filters out CodeBlobs that have +// a duplicate starting address as previous blobs. This is needed to +// handle the case where multiple stubs are generated into a single +// BufferBlob. + +void CodeBlobCollector::do_blob(CodeBlob* cb) { + + // ignore nmethods + if (cb->is_nmethod()) { + return; + } + // exclude VtableStubs, which are processed separately + if (cb->is_buffer_blob() && strcmp(cb->name(), "vtable chunks") == 0) { + return; + } + + // check if this starting address has been seen already - the + // assumption is that stubs are inserted into the list before the + // enclosing BufferBlobs. + address addr = cb->code_begin(); + for (int i=0; i<_global_code_blobs->length(); i++) { + JvmtiCodeBlobDesc* scb = _global_code_blobs->at(i); + if (addr == scb->code_begin()) { + return; + } + } + + // record the CodeBlob details as a JvmtiCodeBlobDesc + JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(cb->name(), cb->code_begin(), cb->code_end()); + _global_code_blobs->append(scb); +} + +// called for each VtableStub in VtableStubs + +void CodeBlobCollector::do_vtable_stub(VtableStub* vs) { + JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(vs->is_vtable_stub() ? "vtable stub" : "itable stub", + vs->code_begin(), vs->code_end()); + _global_code_blobs->append(scb); +} + +// collects a list of CodeBlobs in the CodeCache. +// +// The created list is growable array of JvmtiCodeBlobDesc - each one describes +// a CodeBlob. Note that the list is static - this is because CodeBlob::blobs_do +// requires a a C or static function so we can't use an instance function. This +// isn't a problem as the iteration is serial anyway as we need the CodeCache_lock +// to iterate over the code cache. +// +// Note that the CodeBlobs in the CodeCache will include BufferBlobs that may +// contain multiple stubs. As a profiler is interested in the stubs rather than +// the enclosing container we first iterate over the stub code descriptors so +// that the stubs go into the list first. do_blob will then filter out the +// enclosing blobs if the starting address of the enclosing blobs matches the +// starting address of first stub generated in the enclosing blob. + +void CodeBlobCollector::collect() { + assert_locked_or_safepoint(CodeCache_lock); + assert(_global_code_blobs == NULL, "checking"); + + // create the global list + _global_code_blobs = new (ResourceObj::C_HEAP, mtInternal) GrowableArray(50,true); + + // iterate over the stub code descriptors and put them in the list first. + int index = 0; + StubCodeDesc* desc; + while ((desc = StubCodeDesc::desc_for_index(++index)) != NULL) { + _global_code_blobs->append(new JvmtiCodeBlobDesc(desc->name(), desc->begin(), desc->end())); + } + + // Vtable stubs are not described with StubCodeDesc, + // process them separately + VtableStubs::vtable_stub_do(do_vtable_stub); + + // next iterate over all the non-nmethod code blobs and add them to + // the list - as noted above this will filter out duplicates and + // enclosing blobs. + CodeCache::blobs_do(do_blob); + + // make the global list the instance list so that it can be used + // for other iterations. + _code_blobs = _global_code_blobs; + _global_code_blobs = NULL; +} + + +// Generate a DYNAMIC_CODE_GENERATED event for each non-nmethod code blob. + +jvmtiError JvmtiCodeBlobEvents::generate_dynamic_code_events(JvmtiEnv* env) { + CodeBlobCollector collector; + + // 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(); + } + + // iterate over the collected list and post an event for each blob + JvmtiCodeBlobDesc* blob = collector.first(); + while (blob != NULL) { + JvmtiExport::post_dynamic_code_generated(env, blob->name(), blob->code_begin(), blob->code_end()); + blob = collector.next(); + } + return JVMTI_ERROR_NONE; +} + + +// Generate a COMPILED_METHOD_LOAD event for each nnmethod +jvmtiError JvmtiCodeBlobEvents::generate_compiled_method_load_events(JvmtiEnv* env) { + HandleMark hm; + + // 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) { + // Only notify for live nmethods + if (current->is_alive()) { + // Lock the nmethod so it can't be freed + nmethodLocker nml(current); + + // 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; +} + + +// create a C-heap allocated address location map for an nmethod +void JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nmethod *nm, + jvmtiAddrLocationMap** map_ptr, + jint *map_length_ptr) +{ + ResourceMark rm; + jvmtiAddrLocationMap* map = NULL; + jint map_length = 0; + + + // Generate line numbers using PcDesc and ScopeDesc info + methodHandle mh(nm->method()); + + if (!mh->is_native()) { + PcDesc *pcd; + int pcds_in_method; + + pcds_in_method = (nm->scopes_pcs_end() - nm->scopes_pcs_begin()); + map = NEW_C_HEAP_ARRAY(jvmtiAddrLocationMap, pcds_in_method, mtInternal); + + address scopes_data = nm->scopes_data_begin(); + for( pcd = nm->scopes_pcs_begin(); pcd < nm->scopes_pcs_end(); ++pcd ) { + ScopeDesc sc0(nm, pcd->scope_decode_offset(), pcd->should_reexecute(), pcd->return_oop()); + ScopeDesc *sd = &sc0; + while( !sd->is_top() ) { sd = sd->sender(); } + int bci = sd->bci(); + if (bci != InvocationEntryBci) { + assert(map_length < pcds_in_method, "checking"); + map[map_length].start_address = (const void*)pcd->real_pc(nm); + map[map_length].location = bci; + ++map_length; + } + } + } + + *map_ptr = map; + *map_length_ptr = map_length; +}