crashpad/minidump/minidump_thread_id_map.cc
Mark Mentovai 6278690abe Update copyright boilerplate, 2022 edition (Crashpad)
sed -i '' -E -e 's/Copyright (.+) The Crashpad Authors\. All rights reserved\.$/Copyright \1 The Crashpad Authors/' $(git grep -El 'Copyright (.+) The Crashpad Authors\. All rights reserved\.$')

Bug: chromium:1098010
Change-Id: I8d6138469ddbe3d281a5d83f64cf918ec2491611
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3878262
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
2022-09-06 23:54:07 +00:00

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// Copyright 2014 The Crashpad Authors
//
// 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_thread_id_map.h"
#include <limits>
#include <set>
#include <utility>
#include "base/check_op.h"
#include "base/numerics/safe_conversions.h"
#include "snapshot/thread_snapshot.h"
namespace crashpad {
void BuildMinidumpThreadIDMap(
const std::vector<const ThreadSnapshot*>& thread_snapshots,
MinidumpThreadIDMap* thread_id_map) {
DCHECK(thread_id_map->empty());
// First, try truncating each 64-bit thread ID to 32 bits. If thats possible
// for each unique 64-bit thread ID, then this will be used as the mapping.
// This preserves as much of the original thread ID as possible when feasible.
bool collision = false;
std::set<uint32_t> thread_ids_32;
for (const ThreadSnapshot* thread_snapshot : thread_snapshots) {
uint64_t thread_id_64 = thread_snapshot->ThreadID();
if (thread_id_map->find(thread_id_64) == thread_id_map->end()) {
uint32_t thread_id_32 = static_cast<uint32_t>(thread_id_64);
if (!thread_ids_32.insert(thread_id_32).second) {
collision = true;
break;
}
thread_id_map->insert(std::make_pair(thread_id_64, thread_id_32));
}
}
if (collision) {
// Since there was a collision, go back and assign each unique 64-bit thread
// ID its own sequential 32-bit equivalent. The 32-bit thread IDs will not
// bear any resemblance to the original 64-bit thread IDs.
thread_id_map->clear();
for (const ThreadSnapshot* thread_snapshot : thread_snapshots) {
uint64_t thread_id_64 = thread_snapshot->ThreadID();
if (thread_id_map->find(thread_id_64) == thread_id_map->end()) {
uint32_t thread_id_32 =
base::checked_cast<uint32_t>(thread_id_map->size());
thread_id_map->insert(std::make_pair(thread_id_64, thread_id_32));
}
}
DCHECK_LE(thread_id_map->size(), std::numeric_limits<uint32_t>::max());
}
}
} // namespace crashpad