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Profiler: Parse and render signpost strings

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The first perf_event argument to a PERF_EVENT_SIGNPOST is now
interpreted as a string ID (in the profile strings set.)

This allows us to generate signposts with custom strings. :^)
This commit is contained in:
Andreas Kling 2021-08-11 20:29:34 +02:00
parent 4657c79143
commit 3ed6c137df
3 changed files with 15 additions and 3 deletions
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14
Userland/DevTools/Profiler/Profile.cpp
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@ -208,6 +208,17 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
if (!file_or_error.is_error())
kernel_elf = make<ELF::Image>(file_or_error.value()->bytes());
auto strings_value = object.get_ptr("strings"sv);
if (!strings_value || !strings_value->is_object())
return String { "Malformed profile (strings is not an object)" };
HashMap<FlatPtr, String> profile_strings;
strings_value->as_object().for_each_member([&](String const& key, JsonValue const& value) {
auto string_id = key.to_uint();
VERIFY(string_id.has_value());
profile_strings.set(string_id.value(), value.to_string());
});
auto events_value = object.get_ptr("events");
if (!events_value || !events_value->is_array())
return String { "Malformed profile (events is not an array)" };
@ -242,7 +253,8 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
event.ptr = perf_event.get("ptr").to_number<FlatPtr>();
} else if (event.type == "signpost"sv) {
is_signpost = true;
event.arg1 = perf_event.get("arg1").to_number<FlatPtr>();
auto string_id = perf_event.get("arg1").to_number<FlatPtr>();
event.signpost_string = profile_strings.get(string_id).value_or(String::formatted("Signpost #{}", string_id));
event.arg2 = perf_event.get("arg2").to_number<FlatPtr>();
} else if (event.type == "mmap"sv) {
event.ptr = perf_event.get("ptr").to_number<FlatPtr>();