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third_party/crashpad/crashpad/minidump/minidump_file_writer.cc

Index: third_party/crashpad/crashpad/minidump/minidump_file_writer.cc
diff --git a/third_party/crashpad/crashpad/minidump/minidump_file_writer.cc b/third_party/crashpad/crashpad/minidump/minidump_file_writer.cc
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index 0000000000000000000000000000000000000000..be2b1cd87ce19e46a5912e422048f9b287161c08
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+++ b/third_party/crashpad/crashpad/minidump/minidump_file_writer.cc
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+// 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.
+
+#include "minidump/minidump_file_writer.h"
+
+#include "base/logging.h"
+#include "minidump/minidump_crashpad_info_writer.h"
+#include "minidump/minidump_exception_writer.h"
+#include "minidump/minidump_handle_writer.h"
+#include "minidump/minidump_memory_info_writer.h"
+#include "minidump/minidump_memory_writer.h"
+#include "minidump/minidump_misc_info_writer.h"
+#include "minidump/minidump_module_writer.h"
+#include "minidump/minidump_system_info_writer.h"
+#include "minidump/minidump_thread_id_map.h"
+#include "minidump/minidump_thread_writer.h"
+#include "minidump/minidump_writer_util.h"
+#include "snapshot/process_snapshot.h"
+#include "util/file/file_writer.h"
+#include "util/stdlib/move.h"
+#include "util/numeric/safe_assignment.h"
+
+namespace crashpad {
+
+MinidumpFileWriter::MinidumpFileWriter()
+    : MinidumpWritable(), header_(), streams_(), stream_types_() {
+  // Don’t set the signature field right away. Leave it set to 0, so that a
+  // partially-written minidump file isn’t confused for a complete and valid
+  // one. The header will be rewritten in WriteToFile().
+  header_.Signature = 0;
+
+  header_.Version = MINIDUMP_VERSION;
+  header_.CheckSum = 0;
+  header_.Flags = MiniDumpNormal;
+}
+
+MinidumpFileWriter::~MinidumpFileWriter() {
+}
+
+void MinidumpFileWriter::InitializeFromSnapshot(
+    const ProcessSnapshot* process_snapshot) {
+  DCHECK_EQ(state(), kStateMutable);
+  DCHECK_EQ(header_.Signature, 0u);
+  DCHECK_EQ(header_.TimeDateStamp, 0u);
+  DCHECK_EQ(header_.Flags, MiniDumpNormal);
+  DCHECK(streams_.empty());
+
+  // This time is truncated to an integer number of seconds, not rounded, for
+  // compatibility with the truncation of process_snapshot->ProcessStartTime()
+  // done by MinidumpMiscInfoWriter::InitializeFromSnapshot(). Handling both
+  // timestamps in the same way allows the highest-fidelity computation of
+  // process uptime as the difference between the two values.
+  timeval snapshot_time;
+  process_snapshot->SnapshotTime(&snapshot_time);
+  SetTimestamp(snapshot_time.tv_sec);
+
+  const SystemSnapshot* system_snapshot = process_snapshot->System();
+  auto system_info = make_scoped_ptr(new MinidumpSystemInfoWriter());
+  system_info->InitializeFromSnapshot(system_snapshot);
+  AddStream(crashpad::move(system_info));
+
+  auto misc_info = make_scoped_ptr(new MinidumpMiscInfoWriter());
+  misc_info->InitializeFromSnapshot(process_snapshot);
+  AddStream(crashpad::move(misc_info));
+
+  auto memory_list = make_scoped_ptr(new MinidumpMemoryListWriter());
+  auto thread_list = make_scoped_ptr(new MinidumpThreadListWriter());
+  thread_list->SetMemoryListWriter(memory_list.get());
+  MinidumpThreadIDMap thread_id_map;
+  thread_list->InitializeFromSnapshot(process_snapshot->Threads(),
+                                      &thread_id_map);
+  AddStream(crashpad::move(thread_list));
+
+  const ExceptionSnapshot* exception_snapshot = process_snapshot->Exception();
+  if (exception_snapshot) {
+    auto exception = make_scoped_ptr(new MinidumpExceptionWriter());
+    exception->InitializeFromSnapshot(exception_snapshot, thread_id_map);
+    AddStream(crashpad::move(exception));
+  }
+
+  auto module_list = make_scoped_ptr(new MinidumpModuleListWriter());
+  module_list->InitializeFromSnapshot(process_snapshot->Modules());
+  AddStream(crashpad::move(module_list));
+
+  auto crashpad_info = make_scoped_ptr(new MinidumpCrashpadInfoWriter());
+  crashpad_info->InitializeFromSnapshot(process_snapshot);
+
+  // Since the MinidumpCrashpadInfo stream is an extension, it’s safe to not add
+  // it to the minidump file if it wouldn’t carry any useful information.
+  if (crashpad_info->IsUseful()) {
+    AddStream(crashpad::move(crashpad_info));
+  }
+
+  std::vector<const MemoryMapRegionSnapshot*> memory_map_snapshot =
+      process_snapshot->MemoryMap();
+  if (!memory_map_snapshot.empty()) {
+    auto memory_info_list = make_scoped_ptr(new MinidumpMemoryInfoListWriter());
+    memory_info_list->InitializeFromSnapshot(memory_map_snapshot);
+    AddStream(crashpad::move(memory_info_list));
+  }
+
+  std::vector<HandleSnapshot> handles_snapshot = process_snapshot->Handles();
+  if (!handles_snapshot.empty()) {
+    auto handle_data_writer = make_scoped_ptr(new MinidumpHandleDataWriter());
+    handle_data_writer->InitializeFromSnapshot(handles_snapshot);
+    AddStream(crashpad::move(handle_data_writer));
+  }
+
+  memory_list->AddFromSnapshot(process_snapshot->ExtraMemory());
+
+  AddStream(crashpad::move(memory_list));
+}
+
+void MinidumpFileWriter::SetTimestamp(time_t timestamp) {
+  DCHECK_EQ(state(), kStateMutable);
+
+  internal::MinidumpWriterUtil::AssignTimeT(&header_.TimeDateStamp, timestamp);
+}
+
+void MinidumpFileWriter::AddStream(
+    scoped_ptr<internal::MinidumpStreamWriter> stream) {
+  DCHECK_EQ(state(), kStateMutable);
+
+  MinidumpStreamType stream_type = stream->StreamType();
+
+  auto rv = stream_types_.insert(stream_type);
+  CHECK(rv.second) << "stream_type " << stream_type << " already present";
+
+  streams_.push_back(stream.release());
+
+  DCHECK_EQ(streams_.size(), stream_types_.size());
+}
+
+bool MinidumpFileWriter::WriteEverything(FileWriterInterface* file_writer) {
+  DCHECK_EQ(state(), kStateMutable);
+
+  FileOffset start_offset = file_writer->Seek(0, SEEK_CUR);
+  if (start_offset < 0) {
+    return false;
+  }
+
+  if (!MinidumpWritable::WriteEverything(file_writer)) {
+    return false;
+  }
+
+  FileOffset end_offset = file_writer->Seek(0, SEEK_CUR);
+  if (end_offset < 0) {
+    return false;
+  }
+
+  // Now that the entire minidump file has been completely written, go back to
+  // the beginning and rewrite the header with the correct signature to identify
+  // it as a valid minidump file.
+  header_.Signature = MINIDUMP_SIGNATURE;
+
+  if (file_writer->Seek(start_offset, SEEK_SET) != 0) {
+    return false;
+  }
+
+  if (!file_writer->Write(&header_, sizeof(header_))) {
+    return false;
+  }
+
+  // Seek back to the end of the file, in case some non-minidump content will be
+  // written to the file after the minidump content.
+  return file_writer->Seek(end_offset, SEEK_SET) >= 0;
+}
+
+bool MinidumpFileWriter::Freeze() {
+  DCHECK_EQ(state(), kStateMutable);
+
+  if (!MinidumpWritable::Freeze()) {
+    return false;
+  }
+
+  size_t stream_count = streams_.size();
+  CHECK_EQ(stream_count, stream_types_.size());
+
+  if (!AssignIfInRange(&header_.NumberOfStreams, stream_count)) {
+    LOG(ERROR) << "stream_count " << stream_count << " out of range";
+    return false;
+  }
+
+  return true;
+}
+
+size_t MinidumpFileWriter::SizeOfObject() {
+  DCHECK_GE(state(), kStateFrozen);
+  DCHECK_EQ(streams_.size(), stream_types_.size());
+
+  return sizeof(header_) + streams_.size() * sizeof(MINIDUMP_DIRECTORY);
+}
+
+std::vector<internal::MinidumpWritable*> MinidumpFileWriter::Children() {
+  DCHECK_GE(state(), kStateFrozen);
+  DCHECK_EQ(streams_.size(), stream_types_.size());
+
+  std::vector<MinidumpWritable*> children;
+  for (internal::MinidumpStreamWriter* stream : streams_) {
+    children.push_back(stream);
+  }
+
+  return children;
+}
+
+bool MinidumpFileWriter::WillWriteAtOffsetImpl(FileOffset offset) {
+  DCHECK_EQ(state(), kStateFrozen);
+  DCHECK_EQ(offset, 0);
+  DCHECK_EQ(streams_.size(), stream_types_.size());
+
+  auto directory_offset = streams_.empty() ? 0 : offset + sizeof(header_);
+  if (!AssignIfInRange(&header_.StreamDirectoryRva, directory_offset)) {
+    LOG(ERROR) << "offset " << directory_offset << " out of range";
+    return false;
+  }
+
+  return MinidumpWritable::WillWriteAtOffsetImpl(offset);
+}
+
+bool MinidumpFileWriter::WriteObject(FileWriterInterface* file_writer) {
+  DCHECK_EQ(state(), kStateWritable);
+  DCHECK_EQ(streams_.size(), stream_types_.size());
+
+  WritableIoVec iov;
+  iov.iov_base = &header_;
+  iov.iov_len = sizeof(header_);
+  std::vector<WritableIoVec> iovecs(1, iov);
+
+  for (internal::MinidumpStreamWriter* stream : streams_) {
+    iov.iov_base = stream->DirectoryListEntry();
+    iov.iov_len = sizeof(MINIDUMP_DIRECTORY);
+    iovecs.push_back(iov);
+  }
+
+  return file_writer->WriteIoVec(&iovecs);
+}
+
+}  // namespace crashpad