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