jdk8-mips64-public/hotspot: comparison src/share/vm/prims/jvmtiCodeBlobEvents.cpp

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+:f90c822e73f8
+/*
+* 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<JvmtiCodeBlobDesc*>* _code_blobs;   // collected blobs
+int _pos;                                         // iterator position
+// used during a collection
+static GrowableArray<JvmtiCodeBlobDesc*>* _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<JvmtiCodeBlobDesc*>* 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<JvmtiCodeBlobDesc*>(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;
+}

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/prims/jvmtiCodeBlobEvents.cpp

src/share/vm/prims/jvmtiCodeBlobEvents.cpp