110 lines
3.3 KiB
C++
110 lines
3.3 KiB
C++
// Copyright 2021 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CRASHPAD_UTIL_IOS_SCOPED_VM_READ_H_
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#define CRASHPAD_UTIL_IOS_SCOPED_VM_READ_H_
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#include <mach/mach.h>
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namespace crashpad {
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namespace internal {
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//! \brief Non-templated internal class to be used by ScopedVMRead.
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//!
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//! Note: RUNS-DURING-CRASH.
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class ScopedVMReadInternal {
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public:
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ScopedVMReadInternal();
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ScopedVMReadInternal(const ScopedVMReadInternal&) = delete;
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ScopedVMReadInternal& operator=(const ScopedVMReadInternal&) = delete;
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~ScopedVMReadInternal();
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//! \brief Releases any previously read data and vm_reads \a data. Logs an
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//! error on failure.
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//!
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//! \param[in] data Memory to be read by vm_read.
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//! \param[in] data_length Length of \a data.
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//!
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//! \return `true` if all the data was read. Logs an error and returns false
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//! on failure
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bool Read(const void* data, size_t data_length);
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vm_address_t data() const { return data_; }
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private:
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// The address of the requested data.
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vm_address_t data_;
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// The rounded down page boundary of the requested data.
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vm_address_t vm_read_data_;
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// The size of the pages that were actually read.
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mach_msg_type_number_t vm_read_data_count_;
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};
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//! \brief A scoped wrapper for calls to `vm_read` and `vm_deallocate`. Allows
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//! in-process handler to safely read memory for the intermediate dump.
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//!
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//! Note: RUNS-DURING-CRASH.
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template <typename T>
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class ScopedVMRead {
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public:
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ScopedVMRead() : internal_() {}
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ScopedVMRead(const ScopedVMRead&) = delete;
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ScopedVMRead& operator=(const ScopedVMRead&) = delete;
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~ScopedVMRead() {}
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//! \brief Releases any previously read data and vm_reads data.
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//!
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//! \param[in] data Memory to be read by vm_read.
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//! \param[in] count Length of \a data.
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//!
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//! \return `true` if all \a data was read. Returns false on failure.
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bool Read(const void* data, size_t count = 1) {
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size_t data_length = count * sizeof(T);
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return internal_.Read(data, data_length);
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}
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//! \brief Releases any previously read data and vm_reads address.
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//!
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//! \param[in] address Address of memory to be read by vm_read.
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//! \param[in] count Length of \a data.
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//!
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//! \return `true` if all of \a address was read. Returns false on failure.
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bool Read(vm_address_t address, size_t count = 1) {
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return Read(reinterpret_cast<T*>(address), count);
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}
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//! \brief Returns the pointer to memory safe to read during the in-process
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//! crash handler.
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T* operator->() const { return get(); }
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//! \brief Returns the pointer to memory safe to read during the in-process
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//! crash handler.
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T* get() const { return reinterpret_cast<T*>(internal_.data()); }
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private:
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ScopedVMReadInternal internal_;
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};
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} // namespace internal
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_IOS_SCOPED_VM_READ_H_
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