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These are all of the abstract base classes used in the Snapshot series, discussed in the thread at https://groups.google.com/a/chromium.org/d/topic/crashpad-dev/4pACgjhIz-I. R=rsesek@chromium.org Review URL: https://codereview.chromium.org/597673004
79 lines
3.0 KiB
C++
79 lines
3.0 KiB
C++
// Copyright 2014 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_SNAPSHOT_MEMORY_SNAPSHOT_H_
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#define CRASHPAD_SNAPSHOT_MEMORY_SNAPSHOT_H_
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#include <stdint.h>
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#include <sys/types.h>
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namespace crashpad {
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//! \brief An abstract interface to a snapshot representing a region of memory
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//! present in a snapshot process.
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class MemorySnapshot {
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public:
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//! \brief An interface that MemorySnapshot clients must implement in order to
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//! receive memory snapshot data.
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//!
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//! This callback-based model frees MemorySnapshot implementations from having
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//! to deal with memory region ownership problems. When a memory snapshot’s
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//! data is read, it will be passed to a delegate method.
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class Delegate {
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public:
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//! \brief Called by MemorySnapshot::Read() to provide data requested by a
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//! call to that method.
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//!
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//! \param[in] data A pointer to the data that was read. The callee does not
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//! take ownership of this data. This data is only valid for the
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//! duration of the call to this method.
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//! \param[in] size The size of the data that was read.
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//!
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//! \return `true` on success, `false` on failure. MemoryDelegate::Read()
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//! will use this as its own return value.
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virtual bool MemorySnapshotDelegateRead(void* data, size_t size) = 0;
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protected:
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~Delegate() {}
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};
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//! \brief The base address of the memory snapshot in the snapshot process’
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//! address space.
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virtual uint64_t Address() const = 0;
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//! \brief The size of the memory snapshot.
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virtual size_t Size() const = 0;
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//! \brief Calls Delegate::MemorySnapshotDelegateRead(), providing it with
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//! the memory snapshot’s data.
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//!
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//! Implementations do not necessarily read the memory snapshot data prior to
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//! this method being called. Memory snapshot data may be loaded lazily and
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//! may be discarded after being passed to the delegate. This provides clean
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//! memory management without burdening a snapshot implementation with the
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//! requirement that it track all memory region data simultaneously.
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//!
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//! \return `false` on failure, otherwise, the return value of
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//! Delegate::MemorySnapshotDelegateRead(), which should be `true` on
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//! success and `false` on failure.
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virtual bool Read(Delegate* delegate) const = 0;
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protected:
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~MemorySnapshot() {}
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};
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} // namespace crashpad
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#endif // CRASHPAD_SNAPSHOT_MEMORY_SNAPSHOT_H_
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