211 lines
8.2 KiB
C++
211 lines
8.2 KiB
C++
// Copyright 2014 The Crashpad Authors. All rights reserved.
|
||
//
|
||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
// you may not use this file except in compliance with the License.
|
||
// You may obtain a copy of the License at
|
||
//
|
||
// http://www.apache.org/licenses/LICENSE-2.0
|
||
//
|
||
// Unless required by applicable law or agreed to in writing, software
|
||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
// See the License for the specific language governing permissions and
|
||
// limitations under the License.
|
||
|
||
#ifndef CRASHPAD_MINIDUMP_MINIDUMP_MEMORY_WRITER_H_
|
||
#define CRASHPAD_MINIDUMP_MINIDUMP_MEMORY_WRITER_H_
|
||
|
||
#include <windows.h>
|
||
#include <dbghelp.h>
|
||
#include <stdint.h>
|
||
#include <sys/types.h>
|
||
|
||
#include <memory>
|
||
#include <vector>
|
||
|
||
#include "minidump/minidump_stream_writer.h"
|
||
#include "minidump/minidump_writable.h"
|
||
#include "snapshot/memory_snapshot.h"
|
||
#include "util/file/file_io.h"
|
||
|
||
namespace crashpad {
|
||
|
||
//! \brief The base class for writers of memory ranges pointed to by
|
||
//! MINIDUMP_MEMORY_DESCRIPTOR objects in a minidump file.
|
||
class SnapshotMinidumpMemoryWriter : public internal::MinidumpWritable,
|
||
public MemorySnapshot::Delegate {
|
||
public:
|
||
explicit SnapshotMinidumpMemoryWriter(const MemorySnapshot* memory_snapshot);
|
||
|
||
SnapshotMinidumpMemoryWriter(const SnapshotMinidumpMemoryWriter&) = delete;
|
||
SnapshotMinidumpMemoryWriter& operator=(const SnapshotMinidumpMemoryWriter&) =
|
||
delete;
|
||
|
||
~SnapshotMinidumpMemoryWriter() override;
|
||
|
||
//! \brief Returns a MINIDUMP_MEMORY_DESCRIPTOR referencing the data that this
|
||
//! object writes.
|
||
//!
|
||
//! This method is expected to be called by a MinidumpMemoryListWriter in
|
||
//! order to obtain a MINIDUMP_MEMORY_DESCRIPTOR to include in its list.
|
||
//!
|
||
//! \note Valid in #kStateWritable.
|
||
const MINIDUMP_MEMORY_DESCRIPTOR* MinidumpMemoryDescriptor() const;
|
||
|
||
//! \brief Registers a memory descriptor as one that should point to the
|
||
//! object on which this method is called.
|
||
//!
|
||
//! This method is expected to be called by objects of other classes, when
|
||
//! those other classes have their own memory descriptors that need to point
|
||
//! to memory ranges within a minidump file. MinidumpThreadWriter is one such
|
||
//! class. This method is public for this reason, otherwise it would suffice
|
||
//! to be private.
|
||
//!
|
||
//! \note Valid in #kStateFrozen or any preceding state.
|
||
void RegisterMemoryDescriptor(MINIDUMP_MEMORY_DESCRIPTOR* memory_descriptor);
|
||
|
||
//! \brief Sets the underlying memory snapshot. Does not take ownership of \a
|
||
//! memory_snapshot.
|
||
void SetSnapshot(const MemorySnapshot* memory_snapshot) {
|
||
memory_snapshot_ = memory_snapshot;
|
||
}
|
||
|
||
private:
|
||
friend class MinidumpMemoryListWriter;
|
||
|
||
// MemorySnapshot::Delegate:
|
||
bool MemorySnapshotDelegateRead(void* data, size_t size) override;
|
||
|
||
// MinidumpWritable:
|
||
bool Freeze() override;
|
||
size_t SizeOfObject() final;
|
||
bool WriteObject(FileWriterInterface* file_writer) override;
|
||
|
||
//! \brief Returns the object’s desired byte-boundary alignment.
|
||
//!
|
||
//! Memory regions are aligned to a 16-byte boundary. The actual alignment
|
||
//! requirements of any data within the memory region are unknown, and may be
|
||
//! more or less strict than this depending on the platform.
|
||
//!
|
||
//! \return `16`.
|
||
//!
|
||
//! \note Valid in #kStateFrozen or any subsequent state.
|
||
size_t Alignment() override;
|
||
|
||
bool WillWriteAtOffsetImpl(FileOffset offset) override;
|
||
|
||
//! \brief Returns the object’s desired write phase.
|
||
//!
|
||
//! Memory regions are written at the end of minidump files, because it is
|
||
//! expected that unlike most other data in a minidump file, the contents of
|
||
//! memory regions will be accessed sparsely.
|
||
//!
|
||
//! \return #kPhaseLate.
|
||
//!
|
||
//! \note Valid in any state.
|
||
Phase WritePhase() final;
|
||
|
||
//! \brief Gets the underlying memory snapshot that the memory writer will
|
||
//! write to the minidump.
|
||
const MemorySnapshot* UnderlyingSnapshot() const { return memory_snapshot_; }
|
||
|
||
MINIDUMP_MEMORY_DESCRIPTOR memory_descriptor_;
|
||
|
||
// weak
|
||
std::vector<MINIDUMP_MEMORY_DESCRIPTOR*> registered_memory_descriptors_;
|
||
const MemorySnapshot* memory_snapshot_;
|
||
FileWriterInterface* file_writer_;
|
||
};
|
||
|
||
//! \brief The writer for a MINIDUMP_MEMORY_LIST stream in a minidump file,
|
||
//! containing a list of MINIDUMP_MEMORY_DESCRIPTOR objects.
|
||
class MinidumpMemoryListWriter final : public internal::MinidumpStreamWriter {
|
||
public:
|
||
MinidumpMemoryListWriter();
|
||
|
||
MinidumpMemoryListWriter(const MinidumpMemoryListWriter&) = delete;
|
||
MinidumpMemoryListWriter& operator=(const MinidumpMemoryListWriter&) = delete;
|
||
|
||
~MinidumpMemoryListWriter() override;
|
||
|
||
//! \brief Adds a concrete initialized SnapshotMinidumpMemoryWriter for each
|
||
//! memory snapshot in \a memory_snapshots to the MINIDUMP_MEMORY_LIST.
|
||
//!
|
||
//! Memory snapshots are added in the fashion of AddMemory().
|
||
//!
|
||
//! \param[in] memory_snapshots The memory snapshots to use as source data.
|
||
//!
|
||
//! \note Valid in #kStateMutable.
|
||
void AddFromSnapshot(
|
||
const std::vector<const MemorySnapshot*>& memory_snapshots);
|
||
|
||
//! \brief Adds a SnapshotMinidumpMemoryWriter to the MINIDUMP_MEMORY_LIST.
|
||
//!
|
||
//! This object takes ownership of \a memory_writer and becomes its parent in
|
||
//! the overall tree of internal::MinidumpWritable objects.
|
||
//!
|
||
//! \note Valid in #kStateMutable.
|
||
void AddMemory(std::unique_ptr<SnapshotMinidumpMemoryWriter> memory_writer);
|
||
|
||
//! \brief Adds a SnapshotMinidumpMemoryWriter that’s a child of another
|
||
//! internal::MinidumpWritable object to the MINIDUMP_MEMORY_LIST.
|
||
//!
|
||
//! \a memory_writer does not become a child of this object, but the
|
||
//! MINIDUMP_MEMORY_LIST will still contain a MINIDUMP_MEMORY_DESCRIPTOR for
|
||
//! it. \a memory_writer must be a child of another object in the
|
||
//! internal::MinidumpWritable tree.
|
||
//!
|
||
//! This method exists to be called by objects that have their own
|
||
//! SnapshotMinidumpMemoryWriter children but wish for them to also appear in
|
||
//! the minidump file’s MINIDUMP_MEMORY_LIST. MinidumpThreadWriter, which has
|
||
//! a SnapshotMinidumpMemoryWriter for thread stack memory, is an example.
|
||
//!
|
||
//! \note Valid in #kStateMutable.
|
||
void AddNonOwnedMemory(SnapshotMinidumpMemoryWriter* memory_writer);
|
||
|
||
protected:
|
||
// MinidumpWritable:
|
||
bool Freeze() override;
|
||
size_t SizeOfObject() override;
|
||
std::vector<MinidumpWritable*> Children() override;
|
||
bool WriteObject(FileWriterInterface* file_writer) override;
|
||
|
||
// MinidumpStreamWriter:
|
||
MinidumpStreamType StreamType() const override;
|
||
|
||
//! \brief Merges any overlapping and abutting memory ranges that were added
|
||
//! via AddFromSnapshot() and AddMemory() into single entries.
|
||
//!
|
||
//! This is expected to be called once just before writing, generally from
|
||
//! Freeze().
|
||
//!
|
||
//! This function has the side-effect of merging owned ranges, dropping any
|
||
//! owned ranges that overlap with non-owned ranges, removing empty ranges,
|
||
//! and sorting all ranges by address.
|
||
//!
|
||
//! Per its name, this coalesces owned memory, however, this is not a complete
|
||
//! solution for ensuring that no overlapping memory ranges are emitted in the
|
||
//! minidump. In particular, if AddNonOwnedMemory() is used to add multiple
|
||
//! overlapping ranges, then overlapping ranges will still be emitted to the
|
||
//! minidump. Currently, AddNonOwnedMemory() is used only for adding thread
|
||
//! stacks, so overlapping shouldn't be a problem in practice. For more
|
||
//! details see https://crashpad.chromium.org/bug/61 and
|
||
//! https://crrev.com/c/374539.
|
||
void CoalesceOwnedMemory();
|
||
|
||
private:
|
||
//! \brief Drops children_ ranges that overlap non_owned_memory_writers_.
|
||
void DropRangesThatOverlapNonOwned();
|
||
|
||
std::vector<SnapshotMinidumpMemoryWriter*> non_owned_memory_writers_; // weak
|
||
std::vector<std::unique_ptr<SnapshotMinidumpMemoryWriter>> children_;
|
||
std::vector<std::unique_ptr<const MemorySnapshot>>
|
||
snapshots_created_during_merge_;
|
||
std::vector<SnapshotMinidumpMemoryWriter*> all_memory_writers_; // weak
|
||
MINIDUMP_MEMORY_LIST memory_list_base_;
|
||
};
|
||
|
||
} // namespace crashpad
|
||
|
||
#endif // CRASHPAD_MINIDUMP_MINIDUMP_MEMORY_WRITER_H_
|