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429a3368d4
- dbghelp.h requires windows.h to be included before it (ick!). Add a stub one for non_win to make this work. - convert __attribute__ -> macro that can work work with MSVC; - a handful of narrowing casts. R=mark@chromium.org BUG=crashpad:1 Review URL: https://codereview.chromium.org/883773005
67 lines
2.4 KiB
C++
67 lines
2.4 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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#include "minidump/minidump_thread_id_map.h"
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#include <limits>
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#include <set>
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#include <utility>
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#include "base/logging.h"
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#include "snapshot/thread_snapshot.h"
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namespace crashpad {
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void BuildMinidumpThreadIDMap(
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const std::vector<const ThreadSnapshot*>& thread_snapshots,
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MinidumpThreadIDMap* thread_id_map) {
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DCHECK(thread_id_map->empty());
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// First, try truncating each 64-bit thread ID to 32 bits. If that’s possible
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// for each unique 64-bit thread ID, then this will be used as the mapping.
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// This preserves as much of the original thread ID as possible when feasible.
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bool collision = false;
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std::set<uint32_t> thread_ids_32;
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for (const ThreadSnapshot* thread_snapshot : thread_snapshots) {
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uint64_t thread_id_64 = thread_snapshot->ThreadID();
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if (thread_id_map->find(thread_id_64) == thread_id_map->end()) {
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uint32_t thread_id_32 = static_cast<uint32_t>(thread_id_64);
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if (thread_ids_32.find(thread_id_32) != thread_ids_32.end()) {
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collision = true;
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break;
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}
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thread_ids_32.insert(thread_id_32);
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thread_id_map->insert(std::make_pair(thread_id_64, thread_id_32));
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}
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}
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if (collision) {
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// Since there was a collision, go back and assign each unique 64-bit thread
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// ID its own sequential 32-bit equivalent. The 32-bit thread IDs will not
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// bear any resemblance to the original 64-bit thread IDs.
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thread_id_map->clear();
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for (const ThreadSnapshot* thread_snapshot : thread_snapshots) {
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uint64_t thread_id_64 = thread_snapshot->ThreadID();
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if (thread_id_map->find(thread_id_64) == thread_id_map->end()) {
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uint32_t thread_id_32 = thread_id_map->size();
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thread_id_map->insert(std::make_pair(thread_id_64, thread_id_32));
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}
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}
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DCHECK_LE(thread_id_map->size(), std::numeric_limits<uint32_t>::max());
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}
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}
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} // namespace crashpad
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