/*
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* Copyright (C) 2019 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 SRC_TRACE_PROCESSOR_SYSCALL_TRACKER_H_
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#define SRC_TRACE_PROCESSOR_SYSCALL_TRACKER_H_
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#include <limits>
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#include <tuple>
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#include "perfetto/base/string_view.h"
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#include "src/trace_processor/slice_tracker.h"
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#include "src/trace_processor/trace_processor_context.h"
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#include "src/trace_processor/trace_storage.h"
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namespace perfetto {
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namespace trace_processor {
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static constexpr size_t kMaxSyscalls = 550;
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enum Architecture {
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kUnknown = 0,
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kArmEabi, // 32-bit kernel running a 32-bit process (most old devices).
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kAarch32, // 64-bit kernel running a 32-bit process (should be rare).
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kAarch64, // 64-bit kernel running a 64-bit process (most new devices).
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kX86_64,
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};
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class SyscallTracker {
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public:
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explicit SyscallTracker(TraceProcessorContext*);
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SyscallTracker(const SyscallTracker&) = delete;
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SyscallTracker& operator=(const SyscallTracker&) = delete;
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virtual ~SyscallTracker();
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void SetArchitecture(Architecture architecture);
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void Enter(int64_t ts, UniqueTid utid, uint32_t syscall_num) {
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StringId name = SyscallNumberToStringId(syscall_num);
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if (name)
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context_->slice_tracker->Begin(ts, utid, 0 /* cat */, name);
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}
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void Exit(int64_t ts, UniqueTid utid, uint32_t syscall_num) {
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StringId name = SyscallNumberToStringId(syscall_num);
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if (name)
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context_->slice_tracker->End(ts, utid, 0 /* cat */, name);
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}
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private:
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TraceProcessorContext* const context_;
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inline StringId SyscallNumberToStringId(uint32_t syscall_num) {
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if (syscall_num > kMaxSyscalls)
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return 0;
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// We see two write sys calls around each userspace slice that is going via
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// trace_marker, this violates the assumption that userspace slices are
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// perfectly nested. For the moment ignore all write sys calls.
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// TODO(hjd): Remove this limitation.
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StringId id = arch_syscall_to_string_id_[syscall_num];
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if (id == sys_write_string_id_)
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return 0;
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return id;
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}
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// This is table from platform specific syscall number directly to
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// the relevent StringId (this avoids having to always do two conversions).
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std::array<StringId, kMaxSyscalls> arch_syscall_to_string_id_{};
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StringId sys_write_string_id_ = std::numeric_limits<StringId>::max();
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};
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} // namespace trace_processor
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} // namespace perfetto
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#endif // SRC_TRACE_PROCESSOR_SYSCALL_TRACKER_H_
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