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UserspaceEmulator: Handle PerfEvent syscalls

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We only froward String setting and FlagPost creation for now, due to the
other performance events being nonsensical to forward.
We also record these signposts in the optionally generated profile.
This commit is contained in:
Hediadyoin1 2021-08-20 17:09:23 +02:00 • committed by Brian Gianforcaro
parent 045461b7cb
commit bce3bf9f1e
3 changed files with 63 additions and 7 deletions
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20
Userland/DevTools/UserspaceEmulator/main.cpp
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@ -59,6 +59,9 @@ int main(int argc, char** argv, char** env)
profile_dump_path = String::formatted("{}.{}.profile", LexicalPath(executable_path).basename(), getpid());
OwnPtr<OutputFileStream> profile_stream;
OwnPtr<NonnullOwnPtrVector<String>> profile_strings;
OwnPtr<Vector<int>> profile_string_id_map;
if (dump_profile) {
profile_output_file = fopen(profile_dump_path.characters(), "w+");
if (profile_output_file == nullptr) {
@ -67,6 +70,8 @@ int main(int argc, char** argv, char** env)
return 1;
}
profile_stream = make<OutputFileStream>(profile_output_file);
profile_strings = make<NonnullOwnPtrVector<String>>();
profile_string_id_map = make<Vector<int>>();
profile_stream->write_or_error(R"({"events":[)"sv.bytes());
timeval tv {};
@ -85,7 +90,8 @@ int main(int argc, char** argv, char** env)
// FIXME: It might be nice to tear down the emulator properly.
auto& emulator = *new UserspaceEmulator::Emulator(executable_path, arguments, environment);
emulator.set_profiling_details(dump_profile, profile_instruction_interval, profile_stream);
emulator.set_profiling_details(dump_profile, profile_instruction_interval, profile_stream, profile_strings, profile_string_id_map);
emulator.set_in_region_of_interest(!enable_roi_mode);
if (!emulator.load_elf())
@ -109,8 +115,14 @@ int main(int argc, char** argv, char** env)
rc = emulator.exec();
if (dump_profile)
emulator.profile_stream().write_or_error(R"(], "strings": []})"sv.bytes());
if (dump_profile) {
emulator.profile_stream().write_or_error(", \"strings\": ["sv.bytes());
if (emulator.profiler_strings().size()) {
for (size_t i = 0; i < emulator.profiler_strings().size() - 1; ++i)
emulator.profile_stream().write_or_error(String::formatted("\"{}\", ", emulator.profiler_strings().at(i)).bytes());
emulator.profile_stream().write_or_error(String::formatted("\"{}\"", emulator.profiler_strings().last()).bytes());
}
emulator.profile_stream().write_or_error("]}"sv.bytes());
}
return rc;
}