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//===- Minidump.h - Minidump object file implementation ---------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_OBJECT_MINIDUMP_H
#define LLVM_OBJECT_MINIDUMP_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/iterator.h"
#include "llvm/BinaryFormat/Minidump.h"
#include "llvm/Object/Binary.h"
#include "llvm/Support/Error.h"
namespace llvm {
namespace object {
/// A class providing access to the contents of a minidump file.
class MinidumpFile : public Binary {
public:
/// Construct a new MinidumpFile object from the given memory buffer. Returns
/// an error if this file cannot be identified as a minidump file, or if its
/// contents are badly corrupted (i.e. we cannot read the stream directory).
static Expected<std::unique_ptr<MinidumpFile>> create(MemoryBufferRef Source);
static bool classof(const Binary *B) { return B->isMinidump(); }
/// Returns the contents of the minidump header.
const minidump::Header &header() const { return Header; }
/// Returns the list of streams (stream directory entries) in this file.
ArrayRef<minidump::Directory> streams() const { return Streams; }
/// Returns the raw contents of the stream given by the directory entry.
ArrayRef<uint8_t> getRawStream(const minidump::Directory &Stream) const {
return getData().slice(Stream.Location.RVA, Stream.Location.DataSize);
}
/// Returns the raw contents of the stream of the given type, or std::nullopt
/// if the file does not contain a stream of this type.
std::optional<ArrayRef<uint8_t>>
getRawStream(minidump::StreamType Type) const;
/// Returns the raw contents of an object given by the LocationDescriptor. An
/// error is returned if the descriptor points outside of the minidump file.
Expected<ArrayRef<uint8_t>>
getRawData(minidump::LocationDescriptor Desc) const {
return getDataSlice(getData(), Desc.RVA, Desc.DataSize);
}
/// Returns the minidump string at the given offset. An error is returned if
/// we fail to parse the string, or the string is invalid UTF16.
Expected<std::string> getString(size_t Offset) const;
/// Returns the contents of the SystemInfo stream, cast to the appropriate
/// type. An error is returned if the file does not contain this stream, or
/// the stream is smaller than the size of the SystemInfo structure. The
/// internal consistency of the stream is not checked in any way.
Expected<const minidump::SystemInfo &> getSystemInfo() const {
return getStream<minidump::SystemInfo>(minidump::StreamType::SystemInfo);
}
/// Returns the module list embedded in the ModuleList stream. An error is
/// returned if the file does not contain this stream, or if the stream is
/// not large enough to contain the number of modules declared in the stream
/// header. The consistency of the Module entries themselves is not checked in
/// any way.
Expected<ArrayRef<minidump::Module>> getModuleList() const {
return getListStream<minidump::Module>(minidump::StreamType::ModuleList);
}
/// Returns the thread list embedded in the ThreadList stream. An error is
/// returned if the file does not contain this stream, or if the stream is
/// not large enough to contain the number of threads declared in the stream
/// header. The consistency of the Thread entries themselves is not checked in
/// any way.
Expected<ArrayRef<minidump::Thread>> getThreadList() const {
return getListStream<minidump::Thread>(minidump::StreamType::ThreadList);
}
/// Returns the contents of the Exception stream. An error is returned if the
/// file does not contain this stream, or the stream is smaller than the size
/// of the ExceptionStream structure. The internal consistency of the stream
/// is not checked in any way.
Expected<const minidump::ExceptionStream &> getExceptionStream() const {
return getStream<minidump::ExceptionStream>(
minidump::StreamType::Exception);
}
/// Returns the list of descriptors embedded in the MemoryList stream. The
/// descriptors provide the content of interesting regions of memory at the
/// time the minidump was taken. An error is returned if the file does not
/// contain this stream, or if the stream is not large enough to contain the
/// number of memory descriptors declared in the stream header. The
/// consistency of the MemoryDescriptor entries themselves is not checked in
/// any way.
Expected<ArrayRef<minidump::MemoryDescriptor>> getMemoryList() const {
return getListStream<minidump::MemoryDescriptor>(
minidump::StreamType::MemoryList);
}
class MemoryInfoIterator
: public iterator_facade_base<MemoryInfoIterator,
std::forward_iterator_tag,
minidump::MemoryInfo> {
public:
MemoryInfoIterator(ArrayRef<uint8_t> Storage, size_t Stride)
: Storage(Storage), Stride(Stride) {
assert(Storage.size() % Stride == 0);
}
bool operator==(const MemoryInfoIterator &R) const {
return Storage.size() == R.Storage.size();
}
const minidump::MemoryInfo &operator*() const {
assert(Storage.size() >= sizeof(minidump::MemoryInfo));
return *reinterpret_cast<const minidump::MemoryInfo *>(Storage.data());
}
MemoryInfoIterator &operator++() {
Storage = Storage.drop_front(Stride);
return *this;
}
private:
ArrayRef<uint8_t> Storage;
size_t Stride;
};
/// Returns the list of descriptors embedded in the MemoryInfoList stream. The
/// descriptors provide properties (e.g. permissions) of interesting regions
/// of memory at the time the minidump was taken. An error is returned if the
/// file does not contain this stream, or if the stream is not large enough to
/// contain the number of memory descriptors declared in the stream header.
/// The consistency of the MemoryInfoList entries themselves is not checked
/// in any way.
Expected<iterator_range<MemoryInfoIterator>> getMemoryInfoList() const;
private:
static Error createError(StringRef Str) {
return make_error<GenericBinaryError>(Str, object_error::parse_failed);
}
static Error createEOFError() {
return make_error<GenericBinaryError>("Unexpected EOF",
object_error::unexpected_eof);
}
/// Return a slice of the given data array, with bounds checking.
static Expected<ArrayRef<uint8_t>> getDataSlice(ArrayRef<uint8_t> Data,
size_t Offset, size_t Size);
/// Return the slice of the given data array as an array of objects of the
/// given type. The function checks that the input array is large enough to
/// contain the correct number of objects of the given type.
template <typename T>
static Expected<ArrayRef<T>> getDataSliceAs(ArrayRef<uint8_t> Data,
size_t Offset, size_t Count);
MinidumpFile(MemoryBufferRef Source, const minidump::Header &Header,
ArrayRef<minidump::Directory> Streams,
DenseMap<minidump::StreamType, std::size_t> StreamMap)
: Binary(ID_Minidump, Source), Header(Header), Streams(Streams),
StreamMap(std::move(StreamMap)) {}
ArrayRef<uint8_t> getData() const {
return arrayRefFromStringRef(Data.getBuffer());
}
/// Return the stream of the given type, cast to the appropriate type. Checks
/// that the stream is large enough to hold an object of this type.
template <typename T>
Expected<const T &> getStream(minidump::StreamType Stream) const;
/// Return the contents of a stream which contains a list of fixed-size items,
/// prefixed by the list size.
template <typename T>
Expected<ArrayRef<T>> getListStream(minidump::StreamType Stream) const;
const minidump::Header &Header;
ArrayRef<minidump::Directory> Streams;
DenseMap<minidump::StreamType, std::size_t> StreamMap;
};
template <typename T>
Expected<const T &> MinidumpFile::getStream(minidump::StreamType Type) const {
if (std::optional<ArrayRef<uint8_t>> Stream = getRawStream(Type)) {
if (Stream->size() >= sizeof(T))
return *reinterpret_cast<const T *>(Stream->data());
return createEOFError();
}
return createError("No such stream");
}
template <typename T>
Expected<ArrayRef<T>> MinidumpFile::getDataSliceAs(ArrayRef<uint8_t> Data,
size_t Offset,
size_t Count) {
// Check for overflow.
if (Count > std::numeric_limits<size_t>::max() / sizeof(T))
return createEOFError();
Expected<ArrayRef<uint8_t>> Slice =
getDataSlice(Data, Offset, sizeof(T) * Count);
if (!Slice)
return Slice.takeError();
return ArrayRef<T>(reinterpret_cast<const T *>(Slice->data()), Count);
}
} // end namespace object
} // end namespace llvm
#endif // LLVM_OBJECT_MINIDUMP_H
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