| /* |
| * Copyright (C) 2014, 2015 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "Sizes.h" |
| #include "Zone.h" |
| |
| namespace bmalloc { |
| |
| template<typename T> static void remoteRead(task_t task, memory_reader_t reader, vm_address_t remotePointer, T& result) |
| { |
| void* tmp = nullptr; |
| kern_return_t error = reader(task, remotePointer, sizeof(T), &tmp); |
| |
| // This read sometimes fails for unknown reasons (<rdar://problem/14093757>). |
| // Avoid a crash by skipping the memcpy when this happens. |
| if (error || !tmp) { |
| fprintf(stderr, "bmalloc: error reading remote process: 0x%x\n", error); |
| return; |
| } |
| |
| memcpy(&result, tmp, sizeof(T)); |
| } |
| |
| // These function pointers are invoked unconditionally on all zones by various |
| // system tools. We don't support any of these features, but we provide |
| // just enough functionality not to crash. |
| |
| static size_t good_size(malloc_zone_t*, size_t size) |
| { |
| return size; |
| } |
| |
| static boolean_t check(malloc_zone_t*) |
| { |
| return true; |
| } |
| |
| static void print(malloc_zone_t*, boolean_t) |
| { |
| } |
| |
| static void log(malloc_zone_t*, void*) |
| { |
| } |
| |
| static void force_lock(malloc_zone_t*) |
| { |
| } |
| |
| static void force_unlock(malloc_zone_t*) |
| { |
| } |
| |
| static void statistics(malloc_zone_t*, malloc_statistics_t* statistics) |
| { |
| memset(statistics, 0, sizeof(malloc_statistics_t)); |
| } |
| |
| static size_t zoneSize(malloc_zone_t*, const void*) |
| { |
| // Our zone is not public API, so no pointer can belong to us. |
| return 0; |
| } |
| |
| // This function runs inside the leaks process. |
| static kern_return_t enumerator(task_t task, void* context, unsigned type_mask, vm_address_t zone_address, memory_reader_t reader, vm_range_recorder_t recorder) |
| { |
| Zone remoteZone(task, reader, zone_address); |
| for (auto& range : remoteZone.ranges()) { |
| vm_range_t vmRange = { reinterpret_cast<vm_address_t>(range.begin()), range.size() }; |
| |
| if ((type_mask & MALLOC_PTR_REGION_RANGE_TYPE)) |
| (*recorder)(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &vmRange, 1); |
| |
| if ((type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE)) |
| (*recorder)(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, &vmRange, 1); |
| } |
| |
| return 0; |
| } |
| |
| // The memory analysis API requires the contents of this struct to be a static |
| // constant in the program binary. The leaks process will load this struct |
| // out of the program binary (and not out of the running process). |
| static const malloc_introspection_t zoneIntrospect = { |
| .enumerator = bmalloc::enumerator, |
| .good_size = bmalloc::good_size, |
| .check = bmalloc::check, |
| .print = bmalloc::print, |
| .log = bmalloc::log, |
| .force_lock = bmalloc::force_lock, |
| .force_unlock = bmalloc::force_unlock, |
| .statistics = bmalloc::statistics |
| }; |
| |
| Zone::Zone(std::lock_guard<StaticMutex>&) |
| { |
| malloc_zone_t::size = &bmalloc::zoneSize; |
| malloc_zone_t::zone_name = "WebKit Malloc"; |
| malloc_zone_t::introspect = const_cast<malloc_introspection_t*>(&bmalloc::zoneIntrospect); |
| malloc_zone_t::version = 4; |
| malloc_zone_register(this); |
| } |
| |
| Zone::Zone(task_t task, memory_reader_t reader, vm_address_t remotePointer) |
| { |
| remoteRead(task, reader, remotePointer, *this); |
| } |
| |
| } // namespace bmalloc |