1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/prims/jvmtiCodeBlobEvents.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,286 @@
1.4 +/*
1.5 + * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "code/codeBlob.hpp"
1.30 +#include "code/codeCache.hpp"
1.31 +#include "code/scopeDesc.hpp"
1.32 +#include "code/vtableStubs.hpp"
1.33 +#include "memory/resourceArea.hpp"
1.34 +#include "oops/oop.inline.hpp"
1.35 +#include "prims/jvmtiCodeBlobEvents.hpp"
1.36 +#include "prims/jvmtiExport.hpp"
1.37 +#include "runtime/handles.hpp"
1.38 +#include "runtime/handles.inline.hpp"
1.39 +#include "runtime/vmThread.hpp"
1.40 +
1.41 +// Support class to collect a list of the non-nmethod CodeBlobs in
1.42 +// the CodeCache.
1.43 +//
1.44 +// This class actually creates a list of JvmtiCodeBlobDesc - each JvmtiCodeBlobDesc
1.45 +// describes a single CodeBlob in the CodeCache. Note that collection is
1.46 +// done to a static list - this is because CodeCache::blobs_do is defined
1.47 +// as void CodeCache::blobs_do(void f(CodeBlob* nm)) and hence requires
1.48 +// a C or static method.
1.49 +//
1.50 +// Usage :-
1.51 +//
1.52 +// CodeBlobCollector collector;
1.53 +//
1.54 +// collector.collect();
1.55 +// JvmtiCodeBlobDesc* blob = collector.first();
1.56 +// while (blob != NULL) {
1.57 +// :
1.58 +// blob = collector.next();
1.59 +// }
1.60 +//
1.61 +
1.62 +class CodeBlobCollector : StackObj {
1.63 + private:
1.64 + GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected blobs
1.65 + int _pos; // iterator position
1.66 +
1.67 + // used during a collection
1.68 + static GrowableArray<JvmtiCodeBlobDesc*>* _global_code_blobs;
1.69 + static void do_blob(CodeBlob* cb);
1.70 + static void do_vtable_stub(VtableStub* vs);
1.71 + public:
1.72 + CodeBlobCollector() {
1.73 + _code_blobs = NULL;
1.74 + _pos = -1;
1.75 + }
1.76 + ~CodeBlobCollector() {
1.77 + if (_code_blobs != NULL) {
1.78 + for (int i=0; i<_code_blobs->length(); i++) {
1.79 + FreeHeap(_code_blobs->at(i));
1.80 + }
1.81 + delete _code_blobs;
1.82 + }
1.83 + }
1.84 +
1.85 + // collect list of code blobs in the cache
1.86 + void collect();
1.87 +
1.88 + // iteration support - return first code blob
1.89 + JvmtiCodeBlobDesc* first() {
1.90 + assert(_code_blobs != NULL, "not collected");
1.91 + if (_code_blobs->length() == 0) {
1.92 + return NULL;
1.93 + }
1.94 + _pos = 0;
1.95 + return _code_blobs->at(0);
1.96 + }
1.97 +
1.98 + // iteration support - return next code blob
1.99 + JvmtiCodeBlobDesc* next() {
1.100 + assert(_pos >= 0, "iteration not started");
1.101 + if (_pos+1 >= _code_blobs->length()) {
1.102 + return NULL;
1.103 + }
1.104 + return _code_blobs->at(++_pos);
1.105 + }
1.106 +
1.107 +};
1.108 +
1.109 +// used during collection
1.110 +GrowableArray<JvmtiCodeBlobDesc*>* CodeBlobCollector::_global_code_blobs;
1.111 +
1.112 +
1.113 +// called for each CodeBlob in the CodeCache
1.114 +//
1.115 +// This function filters out nmethods as it is only interested in
1.116 +// other CodeBlobs. This function also filters out CodeBlobs that have
1.117 +// a duplicate starting address as previous blobs. This is needed to
1.118 +// handle the case where multiple stubs are generated into a single
1.119 +// BufferBlob.
1.120 +
1.121 +void CodeBlobCollector::do_blob(CodeBlob* cb) {
1.122 +
1.123 + // ignore nmethods
1.124 + if (cb->is_nmethod()) {
1.125 + return;
1.126 + }
1.127 + // exclude VtableStubs, which are processed separately
1.128 + if (cb->is_buffer_blob() && strcmp(cb->name(), "vtable chunks") == 0) {
1.129 + return;
1.130 + }
1.131 +
1.132 + // check if this starting address has been seen already - the
1.133 + // assumption is that stubs are inserted into the list before the
1.134 + // enclosing BufferBlobs.
1.135 + address addr = cb->code_begin();
1.136 + for (int i=0; i<_global_code_blobs->length(); i++) {
1.137 + JvmtiCodeBlobDesc* scb = _global_code_blobs->at(i);
1.138 + if (addr == scb->code_begin()) {
1.139 + return;
1.140 + }
1.141 + }
1.142 +
1.143 + // record the CodeBlob details as a JvmtiCodeBlobDesc
1.144 + JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(cb->name(), cb->code_begin(), cb->code_end());
1.145 + _global_code_blobs->append(scb);
1.146 +}
1.147 +
1.148 +// called for each VtableStub in VtableStubs
1.149 +
1.150 +void CodeBlobCollector::do_vtable_stub(VtableStub* vs) {
1.151 + JvmtiCodeBlobDesc* scb = new JvmtiCodeBlobDesc(vs->is_vtable_stub() ? "vtable stub" : "itable stub",
1.152 + vs->code_begin(), vs->code_end());
1.153 + _global_code_blobs->append(scb);
1.154 +}
1.155 +
1.156 +// collects a list of CodeBlobs in the CodeCache.
1.157 +//
1.158 +// The created list is growable array of JvmtiCodeBlobDesc - each one describes
1.159 +// a CodeBlob. Note that the list is static - this is because CodeBlob::blobs_do
1.160 +// requires a a C or static function so we can't use an instance function. This
1.161 +// isn't a problem as the iteration is serial anyway as we need the CodeCache_lock
1.162 +// to iterate over the code cache.
1.163 +//
1.164 +// Note that the CodeBlobs in the CodeCache will include BufferBlobs that may
1.165 +// contain multiple stubs. As a profiler is interested in the stubs rather than
1.166 +// the enclosing container we first iterate over the stub code descriptors so
1.167 +// that the stubs go into the list first. do_blob will then filter out the
1.168 +// enclosing blobs if the starting address of the enclosing blobs matches the
1.169 +// starting address of first stub generated in the enclosing blob.
1.170 +
1.171 +void CodeBlobCollector::collect() {
1.172 + assert_locked_or_safepoint(CodeCache_lock);
1.173 + assert(_global_code_blobs == NULL, "checking");
1.174 +
1.175 + // create the global list
1.176 + _global_code_blobs = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JvmtiCodeBlobDesc*>(50,true);
1.177 +
1.178 + // iterate over the stub code descriptors and put them in the list first.
1.179 + int index = 0;
1.180 + StubCodeDesc* desc;
1.181 + while ((desc = StubCodeDesc::desc_for_index(++index)) != NULL) {
1.182 + _global_code_blobs->append(new JvmtiCodeBlobDesc(desc->name(), desc->begin(), desc->end()));
1.183 + }
1.184 +
1.185 + // Vtable stubs are not described with StubCodeDesc,
1.186 + // process them separately
1.187 + VtableStubs::vtable_stub_do(do_vtable_stub);
1.188 +
1.189 + // next iterate over all the non-nmethod code blobs and add them to
1.190 + // the list - as noted above this will filter out duplicates and
1.191 + // enclosing blobs.
1.192 + CodeCache::blobs_do(do_blob);
1.193 +
1.194 + // make the global list the instance list so that it can be used
1.195 + // for other iterations.
1.196 + _code_blobs = _global_code_blobs;
1.197 + _global_code_blobs = NULL;
1.198 +}
1.199 +
1.200 +
1.201 +// Generate a DYNAMIC_CODE_GENERATED event for each non-nmethod code blob.
1.202 +
1.203 +jvmtiError JvmtiCodeBlobEvents::generate_dynamic_code_events(JvmtiEnv* env) {
1.204 + CodeBlobCollector collector;
1.205 +
1.206 + // First collect all the code blobs. This has to be done in a
1.207 + // single pass over the code cache with CodeCache_lock held because
1.208 + // there isn't any safe way to iterate over regular CodeBlobs since
1.209 + // they can be freed at any point.
1.210 + {
1.211 + MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1.212 + collector.collect();
1.213 + }
1.214 +
1.215 + // iterate over the collected list and post an event for each blob
1.216 + JvmtiCodeBlobDesc* blob = collector.first();
1.217 + while (blob != NULL) {
1.218 + JvmtiExport::post_dynamic_code_generated(env, blob->name(), blob->code_begin(), blob->code_end());
1.219 + blob = collector.next();
1.220 + }
1.221 + return JVMTI_ERROR_NONE;
1.222 +}
1.223 +
1.224 +
1.225 +// Generate a COMPILED_METHOD_LOAD event for each nnmethod
1.226 +jvmtiError JvmtiCodeBlobEvents::generate_compiled_method_load_events(JvmtiEnv* env) {
1.227 + HandleMark hm;
1.228 +
1.229 + // Walk the CodeCache notifying for live nmethods. The code cache
1.230 + // may be changing while this is happening which is ok since newly
1.231 + // created nmethod will notify normally and nmethods which are freed
1.232 + // can be safely skipped.
1.233 + MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1.234 + nmethod* current = CodeCache::first_nmethod();
1.235 + while (current != NULL) {
1.236 + // Only notify for live nmethods
1.237 + if (current->is_alive()) {
1.238 + // Lock the nmethod so it can't be freed
1.239 + nmethodLocker nml(current);
1.240 +
1.241 + // Don't hold the lock over the notify or jmethodID creation
1.242 + MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1.243 + current->get_and_cache_jmethod_id();
1.244 + JvmtiExport::post_compiled_method_load(current);
1.245 + }
1.246 + current = CodeCache::next_nmethod(current);
1.247 + }
1.248 + return JVMTI_ERROR_NONE;
1.249 +}
1.250 +
1.251 +
1.252 +// create a C-heap allocated address location map for an nmethod
1.253 +void JvmtiCodeBlobEvents::build_jvmti_addr_location_map(nmethod *nm,
1.254 + jvmtiAddrLocationMap** map_ptr,
1.255 + jint *map_length_ptr)
1.256 +{
1.257 + ResourceMark rm;
1.258 + jvmtiAddrLocationMap* map = NULL;
1.259 + jint map_length = 0;
1.260 +
1.261 +
1.262 + // Generate line numbers using PcDesc and ScopeDesc info
1.263 + methodHandle mh(nm->method());
1.264 +
1.265 + if (!mh->is_native()) {
1.266 + PcDesc *pcd;
1.267 + int pcds_in_method;
1.268 +
1.269 + pcds_in_method = (nm->scopes_pcs_end() - nm->scopes_pcs_begin());
1.270 + map = NEW_C_HEAP_ARRAY(jvmtiAddrLocationMap, pcds_in_method, mtInternal);
1.271 +
1.272 + address scopes_data = nm->scopes_data_begin();
1.273 + for( pcd = nm->scopes_pcs_begin(); pcd < nm->scopes_pcs_end(); ++pcd ) {
1.274 + ScopeDesc sc0(nm, pcd->scope_decode_offset(), pcd->should_reexecute(), pcd->return_oop());
1.275 + ScopeDesc *sd = &sc0;
1.276 + while( !sd->is_top() ) { sd = sd->sender(); }
1.277 + int bci = sd->bci();
1.278 + if (bci != InvocationEntryBci) {
1.279 + assert(map_length < pcds_in_method, "checking");
1.280 + map[map_length].start_address = (const void*)pcd->real_pc(nm);
1.281 + map[map_length].location = bci;
1.282 + ++map_length;
1.283 + }
1.284 + }
1.285 + }
1.286 +
1.287 + *map_ptr = map;
1.288 + *map_length_ptr = map_length;
1.289 +}
