rev 7876 : [mq]: nmtfix

   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.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "runtime/os.hpp"
  27 #include "utilities/globalDefinitions.hpp"
  28 #include "utilities/nativeCallStack.hpp"
  29 
  30 const NativeCallStack NativeCallStack::EMPTY_STACK(0, false);
  31 
  32 NativeCallStack::NativeCallStack(int toSkip, bool fillStack) :
  33   _hash_value(0) {
  34 
  35 #if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
  36   fillStack = false;
  37 #endif
  38 
  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 }
  47 
  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 }
  59 
  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 }
  70 
  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     }
  82 
  83     NativeCallStack* p = const_cast<NativeCallStack*>(this);
  84     p->_hash_value = (int)(hash_val & 0xFFFFFFFF);
  85   }
  86   return _hash_value;
  87 }
  88 
  89 void NativeCallStack::print_on(outputStream* out) const {
  90   print_on(out, 0);
  91 }
  92 
  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 }
 119 
--- EOF ---