truffle: src/share/vm/code/debugInfoRec.cpp comparison

comparison src/share/vm/code/debugInfoRec.cpp @ 0:a61af66fc99e jdk7-b24

Initial load

author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	9987d9d5eb0e

comparison

equal deleted inserted replaced

--1:000000000000
+:a61af66fc99e
+/*
+* Copyright 1998-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*
+*/
+# include "incls/_precompiled.incl"
+# include "incls/_debugInfoRec.cpp.incl"
+// Private definition.
+// There is one DIR_Chunk for each scope and values array.
+// A chunk can potentially be used more than once.
+// We keep track of these chunks in order to detect
+// repetition and enable sharing.
+class DIR_Chunk {
+friend class DebugInformationRecorder;
+int  _offset; // location in the stream of this scope
+int  _length; // number of bytes in the stream
+int  _hash;   // hash of stream bytes (for quicker reuse)
+void* operator new(size_t ignore, DebugInformationRecorder* dir) {
+assert(ignore == sizeof(DIR_Chunk), "");
+if (dir->_next_chunk >= dir->_next_chunk_limit) {
+const int CHUNK = 100;
+dir->_next_chunk = NEW_RESOURCE_ARRAY(DIR_Chunk, CHUNK);
+dir->_next_chunk_limit = dir->_next_chunk + CHUNK;
+}
+return dir->_next_chunk++;
+}
+DIR_Chunk(int offset, int length, DebugInformationRecorder* dir) {
+_offset = offset;
+_length = length;
+unsigned int hash = 0;
+address p = dir->stream()->buffer() + _offset;
+for (int i = 0; i < length; i++) {
+if (i == 6)  break;
+hash *= 127;
+hash += p[i];
+}
+_hash = hash;
+}
+DIR_Chunk* find_match(GrowableArray<DIR_Chunk*>* arr,
+int start_index,
+DebugInformationRecorder* dir) {
+int end_index = arr->length();
+int hash = this->_hash, length = this->_length;
+address buf = dir->stream()->buffer();
+for (int i = end_index; --i >= start_index; ) {
+DIR_Chunk* that = arr->at(i);
+if (hash   == that->_hash &&
+length == that->_length &&
+0 == memcmp(buf + this->_offset, buf + that->_offset, length)) {
+return that;
+}
+}
+return NULL;
+}
+};
+static inline bool compute_recording_non_safepoints() {
+if (JvmtiExport::should_post_compiled_method_load()
+&& FLAG_IS_DEFAULT(DebugNonSafepoints)) {
+// The default value of this flag is taken to be true,
+// if JVMTI is looking at nmethod codes.
+// We anticipate that JVMTI may wish to participate in profiling.
+return true;
+}
+// If the flag is set manually, use it, whether true or false.
+// Otherwise, if JVMTI is not in the picture, use the default setting.
+// (This is true in debug, just for the exercise, false in product mode.)
+return DebugNonSafepoints;
+}
+DebugInformationRecorder::DebugInformationRecorder(OopRecorder* oop_recorder)
+: _recording_non_safepoints(compute_recording_non_safepoints())
+{
+_pcs_size   = 100;
+_pcs        = NEW_RESOURCE_ARRAY(PcDesc, _pcs_size);
+_pcs_length = 0;
+_prev_safepoint_pc = PcDesc::lower_offset_limit;
+_stream = new DebugInfoWriteStream(this, 10 * K);
+// make sure that there is no stream_decode_offset that is zero
+_stream->write_byte((jbyte)0xFF);
+// make sure that we can distinguish the value "serialized_null" from offsets
+assert(_stream->position() > serialized_null, "sanity");
+_oop_recorder = oop_recorder;
+_all_chunks    = new GrowableArray<DIR_Chunk*>(300);
+_shared_chunks = new GrowableArray<DIR_Chunk*>(30);
+_next_chunk = _next_chunk_limit = NULL;
+add_new_pc_offset(PcDesc::lower_offset_limit);  // sentinel record
+debug_only(_recording_state = rs_null);
+}
+void DebugInformationRecorder::add_oopmap(int pc_offset, OopMap* map) {
+// !!!!! Preserve old style handling of oopmaps for now
+_oopmaps->add_gc_map(pc_offset, map);
+}
+void DebugInformationRecorder::add_safepoint(int pc_offset, OopMap* map) {
+assert(!_oop_recorder->is_complete(), "not frozen yet");
+// Store the new safepoint
+// Add the oop map
+add_oopmap(pc_offset, map);
+add_new_pc_offset(pc_offset);
+assert(_recording_state == rs_null, "nesting of recording calls");
+debug_only(_recording_state = rs_safepoint);
+}
+void DebugInformationRecorder::add_non_safepoint(int pc_offset) {
+assert(!_oop_recorder->is_complete(), "not frozen yet");
+assert(_recording_non_safepoints, "must be recording non-safepoints");
+add_new_pc_offset(pc_offset);
+assert(_recording_state == rs_null, "nesting of recording calls");
+debug_only(_recording_state = rs_non_safepoint);
+}
+void DebugInformationRecorder::add_new_pc_offset(int pc_offset) {
+assert(_pcs_length == 0 || last_pc()->pc_offset() < pc_offset,
+"must specify a new, larger pc offset");
+// add the pcdesc
+if (_pcs_length == _pcs_size) {
+// Expand
+int     new_pcs_size = _pcs_size * 2;
+PcDesc* new_pcs      = NEW_RESOURCE_ARRAY(PcDesc, new_pcs_size);
+for (int index = 0; index < _pcs_length; index++) {
+new_pcs[index] = _pcs[index];
+}
+_pcs_size = new_pcs_size;
+_pcs      = new_pcs;
+}
+assert(_pcs_size > _pcs_length, "There must be room for after expanding");
+_pcs[_pcs_length++] = PcDesc(pc_offset, DebugInformationRecorder::serialized_null,
+DebugInformationRecorder::serialized_null);
+}
+int DebugInformationRecorder::serialize_monitor_values(GrowableArray<MonitorValue*>* monitors) {
+if (monitors == NULL || monitors->is_empty()) return DebugInformationRecorder::serialized_null;
+assert(_recording_state == rs_safepoint, "must be recording a safepoint");
+int result = stream()->position();
+stream()->write_int(monitors->length());
+for (int index = 0; index < monitors->length(); index++) {
+monitors->at(index)->write_on(stream());
+}
+assert(result != serialized_null, "sanity");
+// (See comment below on DebugInformationRecorder::describe_scope.)
+int shared_result = find_sharable_decode_offset(result);
+if (shared_result != serialized_null) {
+stream()->set_position(result);
+result = shared_result;
+}
+return result;
+}
+int DebugInformationRecorder::serialize_scope_values(GrowableArray<ScopeValue*>* values) {
+if (values == NULL || values->is_empty()) return DebugInformationRecorder::serialized_null;
+assert(_recording_state == rs_safepoint, "must be recording a safepoint");
+int result = stream()->position();
+assert(result != serialized_null, "sanity");
+stream()->write_int(values->length());
+for (int index = 0; index < values->length(); index++) {
+values->at(index)->write_on(stream());
+}
+// (See comment below on DebugInformationRecorder::describe_scope.)
+int shared_result = find_sharable_decode_offset(result);
+if (shared_result != serialized_null) {
+stream()->set_position(result);
+result = shared_result;
+}
+return result;
+}
+#ifndef PRODUCT
+// These variables are put into one block to reduce relocations
+// and make it simpler to print from the debugger.
+static
+struct dir_stats_struct {
+int chunks_queried;
+int chunks_shared;
+int chunks_reshared;
+int chunks_elided;
+void print() {
+tty->print_cr("Debug Data Chunks: %d, shared %d+%d, non-SP's elided %d",
+chunks_queried,
+chunks_shared, chunks_reshared,
+chunks_elided);
+}
+} dir_stats;
+#endif //PRODUCT
+int DebugInformationRecorder::find_sharable_decode_offset(int stream_offset) {
+// Only pull this trick if non-safepoint recording
+// is enabled, for now.
+if (!recording_non_safepoints())
+return serialized_null;
+NOT_PRODUCT(++dir_stats.chunks_queried);
+int stream_length = stream()->position() - stream_offset;
+assert(stream_offset != serialized_null, "should not be null");
+assert(stream_length != 0, "should not be empty");
+DIR_Chunk* ns = new(this) DIR_Chunk(stream_offset, stream_length, this);
+// Look in previously shared scopes first:
+DIR_Chunk* ms = ns->find_match(_shared_chunks, 0, this);
+if (ms != NULL) {
+NOT_PRODUCT(++dir_stats.chunks_reshared);
+assert(ns+1 == _next_chunk, "");
+_next_chunk = ns;
+return ms->_offset;
+}
+// Look in recently encountered scopes next:
+const int MAX_RECENT = 50;
+int start_index = _all_chunks->length() - MAX_RECENT;
+if (start_index < 0)  start_index = 0;
+ms = ns->find_match(_all_chunks, start_index, this);
+if (ms != NULL) {
+NOT_PRODUCT(++dir_stats.chunks_shared);
+// Searching in _all_chunks is limited to a window,
+// but searching in _shared_chunks is unlimited.
+_shared_chunks->append(ms);
+assert(ns+1 == _next_chunk, "");
+_next_chunk = ns;
+return ms->_offset;
+}
+// No match.  Add this guy to the list, in hopes of future shares.
+_all_chunks->append(ns);
+return serialized_null;
+}
+// must call add_safepoint before: it sets PcDesc and this routine uses
+// the last PcDesc set
+void DebugInformationRecorder::describe_scope(int         pc_offset,
+ciMethod*   method,
+int         bci,
+DebugToken* locals,
+DebugToken* expressions,
+DebugToken* monitors) {
+assert(_recording_state != rs_null, "nesting of recording calls");
+PcDesc* last_pd = last_pc();
+assert(last_pd->pc_offset() == pc_offset, "must be last pc");
+int sender_stream_offset = last_pd->scope_decode_offset();
+// update the stream offset of current pc desc
+int stream_offset = stream()->position();
+last_pd->set_scope_decode_offset(stream_offset);
+// serialize sender stream offest
+stream()->write_int(sender_stream_offset);
+// serialize scope
+jobject method_enc = (method == NULL)? NULL: method->encoding();
+stream()->write_int(oop_recorder()->find_index(method_enc));
+stream()->write_bci(bci);
+assert(method == NULL ||
+(method->is_native() && bci == 0) ||
+(!method->is_native() && 0 <= bci && bci < method->code_size()) ||
+bci == -1, "illegal bci");
+// serialize the locals/expressions/monitors
+stream()->write_int((intptr_t) locals);
+stream()->write_int((intptr_t) expressions);
+stream()->write_int((intptr_t) monitors);
+// Here's a tricky bit.  We just wrote some bytes.
+// Wouldn't it be nice to find that we had already
+// written those same bytes somewhere else?
+// If we get lucky this way, reset the stream
+// and reuse the old bytes.  By the way, this
+// trick not only shares parent scopes, but also
+// compresses equivalent non-safepoint PcDescs.
+int shared_stream_offset = find_sharable_decode_offset(stream_offset);
+if (shared_stream_offset != serialized_null) {
+stream()->set_position(stream_offset);
+last_pd->set_scope_decode_offset(shared_stream_offset);
+}
+}
+void DebugInformationRecorder::dump_object_pool(GrowableArray<ScopeValue*>* objects) {
+guarantee( _pcs_length > 0, "safepoint must exist before describing scopes");
+PcDesc* last_pd = &_pcs[_pcs_length-1];
+if (objects != NULL) {
+for (int i = objects->length() - 1; i >= 0; i--) {
+((ObjectValue*) objects->at(i))->set_visited(false);
+}
+}
+int offset = serialize_scope_values(objects);
+last_pd->set_obj_decode_offset(offset);
+}
+void DebugInformationRecorder::end_scopes(int pc_offset, bool is_safepoint) {
+assert(_recording_state == (is_safepoint? rs_safepoint: rs_non_safepoint),
+"nesting of recording calls");
+debug_only(_recording_state = rs_null);
+// Try to compress away an equivalent non-safepoint predecessor.
+// (This only works because we have previously recognized redundant
+// scope trees and made them use a common scope_decode_offset.)
+if (_pcs_length >= 2 && recording_non_safepoints()) {
+PcDesc* last = last_pc();
+PcDesc* prev = prev_pc();
+// If prev is (a) not a safepoint and (b) has the same
+// stream pointer, then it can be coalesced into the last.
+// This is valid because non-safepoints are only sought
+// with pc_desc_near, which (when it misses prev) will
+// search forward until it finds last.
+// In addition, it does not matter if the last PcDesc
+// is for a safepoint or not.
+if (_prev_safepoint_pc < prev->pc_offset() &&
+prev->scope_decode_offset() == last->scope_decode_offset()) {
+assert(prev == last-1, "sane");
+prev->set_pc_offset(pc_offset);
+_pcs_length -= 1;
+NOT_PRODUCT(++dir_stats.chunks_elided);
+}
+}
+// We have just recorded this safepoint.
+// Remember it in case the previous paragraph needs to know.
+if (is_safepoint) {
+_prev_safepoint_pc = pc_offset;
+}
+}
+DebugToken* DebugInformationRecorder::create_scope_values(GrowableArray<ScopeValue*>* values) {
+assert(!_oop_recorder->is_complete(), "not frozen yet");
+return (DebugToken*) (intptr_t) serialize_scope_values(values);
+}
+DebugToken* DebugInformationRecorder::create_monitor_values(GrowableArray<MonitorValue*>* monitors) {
+assert(!_oop_recorder->is_complete(), "not frozen yet");
+return (DebugToken*) (intptr_t) serialize_monitor_values(monitors);
+}
+int DebugInformationRecorder::data_size() {
+debug_only(_oop_recorder->oop_size());  // mark it "frozen" for asserts
+return _stream->position();
+}
+int DebugInformationRecorder::pcs_size() {
+debug_only(_oop_recorder->oop_size());  // mark it "frozen" for asserts
+if (last_pc()->pc_offset() != PcDesc::upper_offset_limit)
+add_new_pc_offset(PcDesc::upper_offset_limit);
+return _pcs_length * sizeof(PcDesc);
+}
+void DebugInformationRecorder::copy_to(nmethod* nm) {
+nm->copy_scopes_data(stream()->buffer(), stream()->position());
+nm->copy_scopes_pcs(_pcs, _pcs_length);
+}
+void DebugInformationRecorder::verify(const nmethod* code) {
+Unimplemented();
+}
+#ifndef PRODUCT
+void DebugInformationRecorder::print_statistics() {
+dir_stats.print();
+}
+#endif //PRODUCT

Mercurial > hg > truffle

comparison src/share/vm/code/debugInfoRec.cpp @ 0:a61af66fc99e jdk7-b24