b938ae51ce
Reviewed-by: coleenp, eosterlund, jrose
489 lines
18 KiB
C++
489 lines
18 KiB
C++
/*
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/javaClasses.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "logging/log.hpp"
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#include "logging/logStream.hpp"
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#include "memory/oopFactory.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/objArrayOop.inline.hpp"
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#include "prims/stackwalk.hpp"
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#include "runtime/globals.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/vframe.inline.hpp"
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#include "utilities/globalDefinitions.hpp"
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// setup and cleanup actions
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void BaseFrameStream::setup_magic_on_entry(objArrayHandle frames_array) {
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frames_array->obj_at_put(magic_pos, _thread->threadObj());
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_anchor = address_value();
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assert(check_magic(frames_array), "invalid magic");
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}
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bool BaseFrameStream::check_magic(objArrayHandle frames_array) {
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oop m1 = frames_array->obj_at(magic_pos);
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jlong m2 = _anchor;
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if (oopDesc::equals(m1, _thread->threadObj()) && m2 == address_value()) return true;
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return false;
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}
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bool BaseFrameStream::cleanup_magic_on_exit(objArrayHandle frames_array) {
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bool ok = check_magic(frames_array);
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frames_array->obj_at_put(magic_pos, NULL);
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_anchor = 0L;
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return ok;
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}
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JavaFrameStream::JavaFrameStream(JavaThread* thread, int mode)
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: BaseFrameStream(thread), _vfst(thread) {
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_need_method_info = StackWalk::need_method_info(mode);
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}
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void JavaFrameStream::next() { _vfst.next();}
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// Returns the BaseFrameStream for the current stack being traversed.
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//
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// Parameters:
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// thread Current Java thread.
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// magic Magic value used for each stack walking
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// frames_array User-supplied buffers. The 0th element is reserved
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// for this BaseFrameStream to use
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//
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BaseFrameStream* BaseFrameStream::from_current(JavaThread* thread, jlong magic,
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objArrayHandle frames_array)
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{
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assert(thread != NULL && thread->is_Java_thread(), "");
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oop m1 = frames_array->obj_at(magic_pos);
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if (!oopDesc::equals(m1, thread->threadObj())) return NULL;
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if (magic == 0L) return NULL;
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BaseFrameStream* stream = (BaseFrameStream*) (intptr_t) magic;
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if (!stream->is_valid_in(thread, frames_array)) return NULL;
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return stream;
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}
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// Unpacks one or more frames into user-supplied buffers.
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// Updates the end index, and returns the number of unpacked frames.
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// Always start with the existing vfst.method and bci.
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// Do not call vfst.next to advance over the last returned value.
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// In other words, do not leave any stale data in the vfst.
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//
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// Parameters:
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// mode Restrict which frames to be decoded.
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// BaseFrameStream stream of frames
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// max_nframes Maximum number of frames to be filled.
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// start_index Start index to the user-supplied buffers.
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// frames_array Buffer to store Class or StackFrame in, starting at start_index.
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// frames array is a Class<?>[] array when only getting caller
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// reference, and a StackFrameInfo[] array (or derivative)
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// otherwise. It should never be null.
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// end_index End index to the user-supplied buffers with unpacked frames.
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//
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// Returns the number of frames whose information was transferred into the buffers.
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//
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int StackWalk::fill_in_frames(jlong mode, BaseFrameStream& stream,
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int max_nframes, int start_index,
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objArrayHandle frames_array,
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int& end_index, TRAPS) {
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log_debug(stackwalk)("fill_in_frames limit=%d start=%d frames length=%d",
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max_nframes, start_index, frames_array->length());
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assert(max_nframes > 0, "invalid max_nframes");
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assert(start_index + max_nframes <= frames_array->length(), "oob");
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int frames_decoded = 0;
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for (; !stream.at_end(); stream.next()) {
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Method* method = stream.method();
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if (method == NULL) continue;
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// skip hidden frames for default StackWalker option (i.e. SHOW_HIDDEN_FRAMES
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// not set) and when StackWalker::getCallerClass is called
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if (!ShowHiddenFrames && (skip_hidden_frames(mode) || get_caller_class(mode))) {
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if (method->is_hidden()) {
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LogTarget(Debug, stackwalk) lt;
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if (lt.is_enabled()) {
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ResourceMark rm(THREAD);
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LogStream ls(lt);
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ls.print(" hidden method: ");
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method->print_short_name(&ls);
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ls.cr();
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}
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continue;
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}
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}
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int index = end_index++;
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LogTarget(Debug, stackwalk) lt;
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if (lt.is_enabled()) {
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ResourceMark rm(THREAD);
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LogStream ls(lt);
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ls.print(" %d: frame method: ", index);
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method->print_short_name(&ls);
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ls.print_cr(" bci=%d", stream.bci());
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}
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if (!need_method_info(mode) && get_caller_class(mode) &&
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index == start_index && method->caller_sensitive()) {
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ResourceMark rm(THREAD);
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THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(),
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err_msg("StackWalker::getCallerClass called from @CallerSensitive %s method",
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method->name_and_sig_as_C_string()));
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}
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// fill in StackFrameInfo and initialize MemberName
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stream.fill_frame(index, frames_array, method, CHECK_0);
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if (++frames_decoded >= max_nframes) break;
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}
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return frames_decoded;
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}
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// Fill in the LiveStackFrameInfo at the given index in frames_array
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void LiveFrameStream::fill_frame(int index, objArrayHandle frames_array,
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const methodHandle& method, TRAPS) {
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Handle stackFrame(THREAD, frames_array->obj_at(index));
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fill_live_stackframe(stackFrame, method, CHECK);
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}
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// Fill in the StackFrameInfo at the given index in frames_array
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void JavaFrameStream::fill_frame(int index, objArrayHandle frames_array,
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const methodHandle& method, TRAPS) {
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if (_need_method_info) {
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Handle stackFrame(THREAD, frames_array->obj_at(index));
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fill_stackframe(stackFrame, method, CHECK);
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} else {
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frames_array->obj_at_put(index, method->method_holder()->java_mirror());
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}
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}
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// Create and return a LiveStackFrame.PrimitiveSlot (if needed) for the
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// StackValue at the given index. 'type' is expected to be T_INT, T_LONG,
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// T_OBJECT, or T_CONFLICT.
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oop LiveFrameStream::create_primitive_slot_instance(StackValueCollection* values,
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int i, BasicType type, TRAPS) {
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Klass* k = SystemDictionary::resolve_or_null(vmSymbols::java_lang_LiveStackFrameInfo(), CHECK_NULL);
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InstanceKlass* ik = InstanceKlass::cast(k);
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JavaValue result(T_OBJECT);
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JavaCallArguments args;
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Symbol* signature = NULL;
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// ## TODO: type is only available in LocalVariable table, if present.
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// ## StackValue type is T_INT or T_OBJECT (or converted to T_LONG on 64-bit)
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switch (type) {
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case T_INT:
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args.push_int(values->int_at(i));
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signature = vmSymbols::asPrimitive_int_signature();
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break;
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case T_LONG:
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args.push_long(values->long_at(i));
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signature = vmSymbols::asPrimitive_long_signature();
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break;
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case T_FLOAT:
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case T_DOUBLE:
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case T_BYTE:
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case T_SHORT:
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case T_CHAR:
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case T_BOOLEAN:
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THROW_MSG_(vmSymbols::java_lang_InternalError(), "Unexpected StackValue type", NULL);
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case T_OBJECT:
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return values->obj_at(i)();
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case T_CONFLICT:
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// put a non-null slot
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#ifdef _LP64
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args.push_long(0);
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signature = vmSymbols::asPrimitive_long_signature();
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#else
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args.push_int(0);
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signature = vmSymbols::asPrimitive_int_signature();
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#endif
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break;
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default: ShouldNotReachHere();
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}
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JavaCalls::call_static(&result,
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ik,
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vmSymbols::asPrimitive_name(),
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signature,
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&args,
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CHECK_NULL);
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return (instanceOop) result.get_jobject();
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}
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objArrayHandle LiveFrameStream::values_to_object_array(StackValueCollection* values, TRAPS) {
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objArrayHandle empty;
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int length = values->size();
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objArrayOop array_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(),
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length, CHECK_(empty));
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objArrayHandle array_h(THREAD, array_oop);
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for (int i = 0; i < values->size(); i++) {
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StackValue* st = values->at(i);
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BasicType type = st->type();
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int index = i;
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#ifdef _LP64
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if (type != T_OBJECT && type != T_CONFLICT) {
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intptr_t ret = st->get_int(); // read full 64-bit slot
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type = T_LONG; // treat as long
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index--; // undo +1 in StackValueCollection::long_at
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}
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#endif
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oop obj = create_primitive_slot_instance(values, index, type, CHECK_(empty));
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if (obj != NULL) {
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array_h->obj_at_put(i, obj);
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}
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}
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return array_h;
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}
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objArrayHandle LiveFrameStream::monitors_to_object_array(GrowableArray<MonitorInfo*>* monitors, TRAPS) {
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int length = monitors->length();
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objArrayOop array_oop = oopFactory::new_objArray(SystemDictionary::Object_klass(),
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length, CHECK_(objArrayHandle()));
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objArrayHandle array_h(THREAD, array_oop);
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for (int i = 0; i < length; i++) {
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MonitorInfo* monitor = monitors->at(i);
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array_h->obj_at_put(i, monitor->owner());
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}
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return array_h;
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}
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// Fill StackFrameInfo with bci and initialize memberName
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void BaseFrameStream::fill_stackframe(Handle stackFrame, const methodHandle& method, TRAPS) {
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java_lang_StackFrameInfo::set_method_and_bci(stackFrame, method, bci(), THREAD);
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}
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// Fill LiveStackFrameInfo with locals, monitors, and expressions
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void LiveFrameStream::fill_live_stackframe(Handle stackFrame,
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const methodHandle& method, TRAPS) {
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fill_stackframe(stackFrame, method, CHECK);
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if (_jvf != NULL) {
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StackValueCollection* locals = _jvf->locals();
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StackValueCollection* expressions = _jvf->expressions();
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GrowableArray<MonitorInfo*>* monitors = _jvf->monitors();
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int mode = 0;
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if (_jvf->is_interpreted_frame()) {
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mode = MODE_INTERPRETED;
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} else if (_jvf->is_compiled_frame()) {
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mode = MODE_COMPILED;
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}
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if (!locals->is_empty()) {
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objArrayHandle locals_h = values_to_object_array(locals, CHECK);
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java_lang_LiveStackFrameInfo::set_locals(stackFrame(), locals_h());
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}
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if (!expressions->is_empty()) {
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objArrayHandle expressions_h = values_to_object_array(expressions, CHECK);
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java_lang_LiveStackFrameInfo::set_operands(stackFrame(), expressions_h());
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}
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if (monitors->length() > 0) {
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objArrayHandle monitors_h = monitors_to_object_array(monitors, CHECK);
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java_lang_LiveStackFrameInfo::set_monitors(stackFrame(), monitors_h());
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}
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java_lang_LiveStackFrameInfo::set_mode(stackFrame(), mode);
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}
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}
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// Begins stack walking.
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//
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// Parameters:
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// stackStream StackStream object
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// mode Stack walking mode.
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// skip_frames Number of frames to be skipped.
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// frame_count Number of frames to be traversed.
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// start_index Start index to the user-supplied buffers.
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// frames_array Buffer to store StackFrame in, starting at start_index.
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// frames array is a Class<?>[] array when only getting caller
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// reference, and a StackFrameInfo[] array (or derivative)
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// otherwise. It should never be null.
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//
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// Returns Object returned from AbstractStackWalker::doStackWalk call.
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//
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oop StackWalk::walk(Handle stackStream, jlong mode,
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int skip_frames, int frame_count, int start_index,
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objArrayHandle frames_array,
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TRAPS) {
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ResourceMark rm(THREAD);
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JavaThread* jt = (JavaThread*)THREAD;
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log_debug(stackwalk)("Start walking: mode " JLONG_FORMAT " skip %d frames batch size %d",
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mode, skip_frames, frame_count);
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if (frames_array.is_null()) {
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THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "frames_array is NULL", NULL);
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}
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// Setup traversal onto my stack.
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if (live_frame_info(mode)) {
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assert (use_frames_array(mode), "Bad mode for get live frame");
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RegisterMap regMap(jt, true);
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LiveFrameStream stream(jt, ®Map);
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return fetchFirstBatch(stream, stackStream, mode, skip_frames, frame_count,
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start_index, frames_array, THREAD);
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} else {
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JavaFrameStream stream(jt, mode);
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return fetchFirstBatch(stream, stackStream, mode, skip_frames, frame_count,
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start_index, frames_array, THREAD);
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}
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}
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oop StackWalk::fetchFirstBatch(BaseFrameStream& stream, Handle stackStream,
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jlong mode, int skip_frames, int frame_count,
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int start_index, objArrayHandle frames_array, TRAPS) {
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methodHandle m_doStackWalk(THREAD, Universe::do_stack_walk_method());
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{
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Klass* stackWalker_klass = SystemDictionary::StackWalker_klass();
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Klass* abstractStackWalker_klass = SystemDictionary::AbstractStackWalker_klass();
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while (!stream.at_end()) {
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InstanceKlass* ik = stream.method()->method_holder();
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if (ik != stackWalker_klass &&
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ik != abstractStackWalker_klass && ik->super() != abstractStackWalker_klass) {
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break;
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}
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LogTarget(Debug, stackwalk) lt;
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if (lt.is_enabled()) {
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ResourceMark rm(THREAD);
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LogStream ls(lt);
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ls.print(" skip ");
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stream.method()->print_short_name(&ls);
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ls.cr();
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}
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stream.next();
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}
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// stack frame has been traversed individually and resume stack walk
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// from the stack frame at depth == skip_frames.
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for (int n=0; n < skip_frames && !stream.at_end(); stream.next(), n++) {
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LogTarget(Debug, stackwalk) lt;
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if (lt.is_enabled()) {
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ResourceMark rm(THREAD);
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LogStream ls(lt);
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ls.print(" skip ");
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stream.method()->print_short_name(&ls);
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ls.cr();
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}
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}
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}
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int end_index = start_index;
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int numFrames = 0;
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if (!stream.at_end()) {
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numFrames = fill_in_frames(mode, stream, frame_count, start_index,
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frames_array, end_index, CHECK_NULL);
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if (numFrames < 1) {
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THROW_MSG_(vmSymbols::java_lang_InternalError(), "stack walk: decode failed", NULL);
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}
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}
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// JVM_CallStackWalk walks the stack and fills in stack frames, then calls to
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// Java method java.lang.StackStreamFactory.AbstractStackWalker::doStackWalk
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// which calls the implementation to consume the stack frames.
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// When JVM_CallStackWalk returns, it invalidates the stack stream.
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JavaValue result(T_OBJECT);
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JavaCallArguments args(stackStream);
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args.push_long(stream.address_value());
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args.push_int(skip_frames);
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args.push_int(frame_count);
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args.push_int(start_index);
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args.push_int(end_index);
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// Link the thread and vframe stream into the callee-visible object
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stream.setup_magic_on_entry(frames_array);
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JavaCalls::call(&result, m_doStackWalk, &args, THREAD);
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// Do this before anything else happens, to disable any lingering stream objects
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bool ok = stream.cleanup_magic_on_exit(frames_array);
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// Throw pending exception if we must
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(void) (CHECK_NULL);
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if (!ok) {
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THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: corrupted buffers on exit", NULL);
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}
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// Return normally
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return (oop)result.get_jobject();
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}
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// Walk the next batch of stack frames
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//
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// Parameters:
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// stackStream StackStream object
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// mode Stack walking mode.
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// magic Must be valid value to continue the stack walk
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// frame_count Number of frames to be decoded.
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// start_index Start index to the user-supplied buffers.
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// frames_array Buffer to store StackFrame in, starting at start_index.
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//
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// Returns the end index of frame filled in the buffer.
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//
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jint StackWalk::fetchNextBatch(Handle stackStream, jlong mode, jlong magic,
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int frame_count, int start_index,
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objArrayHandle frames_array,
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TRAPS)
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{
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JavaThread* jt = (JavaThread*)THREAD;
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BaseFrameStream* existing_stream = BaseFrameStream::from_current(jt, magic, frames_array);
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if (existing_stream == NULL) {
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THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: corrupted buffers", 0L);
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}
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if (frames_array.is_null()) {
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THROW_MSG_(vmSymbols::java_lang_NullPointerException(), "frames_array is NULL", 0L);
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}
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log_debug(stackwalk)("StackWalk::fetchNextBatch frame_count %d existing_stream "
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PTR_FORMAT " start %d frames %d",
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frame_count, p2i(existing_stream), start_index, frames_array->length());
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int end_index = start_index;
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if (frame_count <= 0) {
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return end_index; // No operation.
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}
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int count = frame_count + start_index;
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assert (frames_array->length() >= count, "not enough space in buffers");
|
|
|
|
BaseFrameStream& stream = (*existing_stream);
|
|
if (!stream.at_end()) {
|
|
stream.next(); // advance past the last frame decoded in previous batch
|
|
if (!stream.at_end()) {
|
|
int n = fill_in_frames(mode, stream, frame_count, start_index,
|
|
frames_array, end_index, CHECK_0);
|
|
if (n < 1) {
|
|
THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: later decode failed", 0L);
|
|
}
|
|
return end_index;
|
|
}
|
|
}
|
|
return end_index;
|
|
}
|