jdk8-mips64-public/hotspot: src/share/vm/utilities/nativeCallStack.cpp@dc1769738300

     1 /*

     2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

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    23  */

    25 #include "precompiled.hpp"

    26 #include "runtime/os.hpp"

    27 #include "utilities/globalDefinitions.hpp"

    28 #include "utilities/nativeCallStack.hpp"

    30 const NativeCallStack NativeCallStack::EMPTY_STACK(0, false);

    32 NativeCallStack::NativeCallStack(int toSkip, bool fillStack) :

    33   _hash_value(0) {

    35 #if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED

    36   fillStack = false;

    37 #endif

    39   if (fillStack) {

    40     os::get_native_stack(_stack, NMT_TrackingStackDepth, toSkip);

    41   } else {

    42     for (int index = 0; index < NMT_TrackingStackDepth; index ++) {

    43       _stack[index] = NULL;

    44     }

    45   }

    46 }

    48 NativeCallStack::NativeCallStack(address* pc, int frameCount) {

    49   int frameToCopy = (frameCount < NMT_TrackingStackDepth) ?

    50     frameCount : NMT_TrackingStackDepth;

    51   int index;

    52   for (index = 0; index < frameToCopy; index ++) {

    53     _stack[index] = pc[index];

    54   }

    55   for (; index < NMT_TrackingStackDepth; index ++) {

    56     _stack[index] = NULL;

    57   }

    58 }

    60 // number of stack frames captured

    61 int NativeCallStack::frames() const {

    62   int index;

    63   for (index = 0; index < NMT_TrackingStackDepth; index ++) {

    64     if (_stack[index] == NULL) {

    65       break;

    66     }

    67   }

    68   return index;

    69 }

    71 // Hash code. Any better algorithm?

    72 int NativeCallStack::hash() const {

    73   long hash_val = _hash_value;

    74   if (hash_val == 0) {

    75     long pc;

    76     int  index;

    77     for (index = 0; index < NMT_TrackingStackDepth; index ++) {

    78       pc = (long)_stack[index];

    79       if (pc == 0) break;

    80       hash_val += pc;

    81     }

    83     NativeCallStack* p = const_cast<NativeCallStack*>(this);

    84     p->_hash_value = (int)(hash_val & 0xFFFFFFFF);

    85   }

    86   return _hash_value;

    87 }

    89 void NativeCallStack::print_on(outputStream* out) const {

    90   print_on(out, 0);

    91 }

    93 // Decode and print this call path

    94 void NativeCallStack::print_on(outputStream* out, int indent) const {

    95   address pc;

    96   char    buf[1024];

    97   int     offset;

    98   if (is_empty()) {

    99     for (int index = 0; index < indent; index ++) out->print(" ");

   100 #if PLATFORM_NATIVE_STACK_WALKING_SUPPORTED

   101     out->print("[BOOTSTRAP]");

   102 #else

   103     out->print("[No stack]");

   104 #endif

   105   } else {

   106     for (int frame = 0; frame < NMT_TrackingStackDepth; frame ++) {

   107       pc = get_frame(frame);

   108       if (pc == NULL) break;

   109       // Print indent

   110       for (int index = 0; index < indent; index ++) out->print(" ");

   111       if (os::dll_address_to_function_name(pc, buf, sizeof(buf), &offset)) {

   112         out->print_cr("[" PTR_FORMAT "] %s+0x%x", p2i(pc), buf, offset);

   113       } else {

   114         out->print_cr("[" PTR_FORMAT "]", p2i(pc));

   115       }

   116     }

   117   }

   118 }

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