0a1e54644b
Uses "construct on First Use Idiom" pattern to workaround static initialization order Reviewed-by: dholmes, minqi
127 lines
4.2 KiB
C++
127 lines
4.2 KiB
C++
/*
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* Copyright (c) 2014, 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 "runtime/os.hpp"
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#include "utilities/decoder.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/nativeCallStack.hpp"
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NativeCallStack::NativeCallStack(int toSkip, bool fillStack) :
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_hash_value(0) {
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if (fillStack) {
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// We need to skip the NativeCallStack::NativeCallStack frame if a tail call is NOT used
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// to call os::get_native_stack. A tail call is used if _NMT_NOINLINE_ is not defined
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// (which means this is not a slowdebug build), and we are on 64-bit (except Windows).
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// This is not necessarily a rule, but what has been obvserved to date.
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#if (defined(_NMT_NOINLINE_) || defined(_WINDOWS) || !defined(_LP64))
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// Not a tail call.
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toSkip++;
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#if (defined(_NMT_NOINLINE_) && defined(BSD) && defined(_LP64))
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// Mac OS X slowdebug builds have this odd behavior where NativeCallStack::NativeCallStack
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// appears as two frames, so we need to skip an extra frame.
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toSkip++;
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#endif // Special-case for BSD.
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#endif // Not a tail call.
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os::get_native_stack(_stack, NMT_TrackingStackDepth, toSkip);
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} else {
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for (int index = 0; index < NMT_TrackingStackDepth; index ++) {
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_stack[index] = NULL;
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}
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}
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}
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NativeCallStack::NativeCallStack(address* pc, int frameCount) {
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int frameToCopy = (frameCount < NMT_TrackingStackDepth) ?
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frameCount : NMT_TrackingStackDepth;
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int index;
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for (index = 0; index < frameToCopy; index ++) {
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_stack[index] = pc[index];
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}
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for (; index < NMT_TrackingStackDepth; index ++) {
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_stack[index] = NULL;
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}
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_hash_value = 0;
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}
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// number of stack frames captured
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int NativeCallStack::frames() const {
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int index;
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for (index = 0; index < NMT_TrackingStackDepth; index ++) {
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if (_stack[index] == NULL) {
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break;
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}
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}
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return index;
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}
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// Hash code. Any better algorithm?
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unsigned int NativeCallStack::hash() const {
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uintptr_t hash_val = _hash_value;
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if (hash_val == 0) {
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for (int index = 0; index < NMT_TrackingStackDepth; index++) {
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if (_stack[index] == NULL) break;
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hash_val += (uintptr_t)_stack[index];
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}
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NativeCallStack* p = const_cast<NativeCallStack*>(this);
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p->_hash_value = (unsigned int)(hash_val & 0xFFFFFFFF);
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}
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return _hash_value;
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}
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void NativeCallStack::print_on(outputStream* out) const {
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print_on(out, 0);
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}
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// Decode and print this call path
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void NativeCallStack::print_on(outputStream* out, int indent) const {
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address pc;
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char buf[1024];
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int offset;
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int line_no;
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if (is_empty()) {
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for (int index = 0; index < indent; index ++) out->print(" ");
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out->print("[BOOTSTRAP]");
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} else {
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for (int frame = 0; frame < NMT_TrackingStackDepth; frame ++) {
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pc = get_frame(frame);
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if (pc == NULL) break;
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// Print indent
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for (int index = 0; index < indent; index ++) out->print(" ");
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if (os::dll_address_to_function_name(pc, buf, sizeof(buf), &offset)) {
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out->print("[" PTR_FORMAT "] %s+0x%x", p2i(pc), buf, offset);
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} else {
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out->print("[" PTR_FORMAT "]", p2i(pc));
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}
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if (Decoder::get_source_info(pc, buf, sizeof(buf), &line_no)) {
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out->print(" (%s:%d)", buf, line_no);
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}
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out->cr();
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}
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}
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}
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