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