60521c7d52
- Rewrite the Maps::Parse to use open, and a buffer on the stack. - Rewrite the line parser away from sscanf. The current way sscanf is used does not catch many malformed lines. In addition, this new version improves performance by 50% over sscanf on sailfish. - Add a lot of unit tests for the parser to make sure there are no problems. In addition, add a special line that was not rejected with the previous version of the code. - Add new accessor to get the map at a particular index. - Add a backtrace benchmark for map creation for both new and old. This cl results in ~5% speedup and makes the new unwinder map creation about the same for 64 bit. It's still a bit slower, but not by much. On 32 bit, we are still about 5% slower than the old creation method, though. Bug: 23762183 Test: libunwindstack unit tests pass. Ran the new benchmarks. Change-Id: Id4431e539f400984e6fad62153fdf4152d518322
113 lines
2.6 KiB
C++
113 lines
2.6 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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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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*/
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#ifndef _LIBUNWINDSTACK_MAPS_H
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#define _LIBUNWINDSTACK_MAPS_H
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#include <sys/types.h>
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#include <unistd.h>
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#include <string>
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#include <vector>
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#include <unwindstack/MapInfo.h>
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namespace unwindstack {
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// Special flag to indicate a map is in /dev/. However, a map in
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// /dev/ashmem/... does not set this flag.
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static constexpr int MAPS_FLAGS_DEVICE_MAP = 0x8000;
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class Maps {
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public:
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Maps() = default;
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virtual ~Maps();
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MapInfo* Find(uint64_t pc);
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virtual bool Parse();
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virtual const std::string GetMapsFile() const { return ""; }
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typedef std::vector<MapInfo>::iterator iterator;
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iterator begin() { return maps_.begin(); }
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iterator end() { return maps_.end(); }
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typedef std::vector<MapInfo>::const_iterator const_iterator;
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const_iterator begin() const { return maps_.begin(); }
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const_iterator end() const { return maps_.end(); }
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size_t Total() { return maps_.size(); }
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MapInfo* Get(size_t index) {
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if (index >= maps_.size()) return nullptr;
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return &maps_[index];
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}
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protected:
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std::vector<MapInfo> maps_;
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};
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class RemoteMaps : public Maps {
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public:
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RemoteMaps(pid_t pid) : pid_(pid) {}
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virtual ~RemoteMaps() = default;
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virtual const std::string GetMapsFile() const override;
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private:
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pid_t pid_;
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};
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class LocalMaps : public RemoteMaps {
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public:
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LocalMaps() : RemoteMaps(getpid()) {}
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virtual ~LocalMaps() = default;
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};
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class BufferMaps : public Maps {
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public:
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BufferMaps(const char* buffer) : buffer_(buffer) {}
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virtual ~BufferMaps() = default;
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bool Parse() override;
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private:
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const char* buffer_;
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};
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class FileMaps : public Maps {
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public:
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FileMaps(const std::string& file) : file_(file) {}
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virtual ~FileMaps() = default;
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const std::string GetMapsFile() const override { return file_; }
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protected:
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const std::string file_;
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};
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class OfflineMaps : public FileMaps {
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public:
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OfflineMaps(const std::string& file) : FileMaps(file) {}
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virtual ~OfflineMaps() = default;
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bool Parse() override;
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};
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} // namespace unwindstack
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#endif // _LIBUNWINDSTACK_MAPS_H
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