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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <stdint.h>
     30 
     31 #include "BacktraceData.h"
     32 #include "Config.h"
     33 #include "DebugData.h"
     34 #include "debug_disable.h"
     35 #include "FreeTrackData.h"
     36 #include "GuardData.h"
     37 #include "malloc_debug.h"
     38 #include "TrackData.h"
     39 
     40 bool DebugData::Initialize() {
     41   if (!config_.SetFromProperties()) {
     42     return false;
     43   }
     44 
     45   // Check to see if the options that require a header are enabled.
     46   if ((config_.options & ~(NO_HEADER_OPTIONS)) != 0) {
     47     need_header_ = true;
     48 
     49     // Initialize all of the static header offsets.
     50     pointer_offset_ = BIONIC_ALIGN(sizeof(Header), MINIMUM_ALIGNMENT_BYTES);
     51 
     52     if (config_.options & BACKTRACE) {
     53       backtrace.reset(new BacktraceData(config_, &pointer_offset_));
     54       if (!backtrace->Initialize(config_)) {
     55         return false;
     56       }
     57     }
     58 
     59     if (config_.options & FRONT_GUARD) {
     60       front_guard.reset(new FrontGuardData(config_, &pointer_offset_));
     61     }
     62 
     63     extra_bytes_ = pointer_offset_;
     64 
     65     // Initialize all of the non-header data.
     66     if (config_.options & REAR_GUARD) {
     67       rear_guard.reset(new RearGuardData(config_));
     68       extra_bytes_ += config_.rear_guard_bytes;
     69     }
     70 
     71     if (config_.options & FREE_TRACK) {
     72       free_track.reset(new FreeTrackData(config_));
     73     }
     74 
     75     if (config_.options & TRACK_ALLOCS) {
     76       track.reset(new TrackData());
     77     }
     78   }
     79 
     80   if (config_.options & EXPAND_ALLOC) {
     81     extra_bytes_ += config_.expand_alloc_bytes;
     82   }
     83   return true;
     84 }
     85 
     86 void DebugData::PrepareFork() {
     87   if (track != nullptr) {
     88     track->PrepareFork();
     89   }
     90 }
     91 
     92 void DebugData::PostForkParent() {
     93   if (track != nullptr) {
     94     track->PostForkParent();
     95   }
     96 }
     97 
     98 void DebugData::PostForkChild() {
     99   if (track != nullptr) {
    100     track->PostForkChild();
    101   }
    102 }
    103