UserspaceEmulator: Make generated profiles debugable with cli tools

The fact that profiles are json on one giant line makes them very
difficult to debug when things go wrong. Instead make sure to wrap
each event or sample on a newline so you can easily grep/heap/tail
the profile files.

1 files changed, 2 insertions, 1 deletions

diff --git a/Userland/DevTools/UserspaceEmulator/Emulator.cpp b/Userland/DevTools/UserspaceEmulator/Emulator.cpp
index 64bb35c54e..65e50e8908 100644
--- a/Userland/DevTools/UserspaceEmulator/Emulator.cpp
+++ b/Userland/DevTools/UserspaceEmulator/Emulator.cpp
@@ -476,7 +476,7 @@ void Emulator::emit_profile_sample(AK::OutputStream& output)
     gettimeofday(&tv, nullptr);
     builder.appendff(R"~(, {{"type": "sample", "pid": {}, "tid": {}, "timestamp": {}, "lost_samples": 0, "stack": [)~", getpid(), gettid(), tv.tv_sec * 1000 + tv.tv_usec / 1000);
     builder.join(',', raw_backtrace());
-    builder.append("]}");
+    builder.append("]}\n");
     output.write_or_error(builder.string_view().bytes());
 }
 
@@ -486,6 +486,7 @@ void Emulator::emit_profile_event(AK::OutputStream& output, StringView event_nam
     timeval tv {};
     gettimeofday(&tv, nullptr);
     builder.appendff(R"~(, {{"type": "{}", "pid": {}, "tid": {}, "timestamp": {}, "lost_samples": 0, "stack": [], {}}})~", event_name, getpid(), gettid(), tv.tv_sec * 1000 + tv.tv_usec / 1000, contents);
+    builder.append('\n');
     output.write_or_error(builder.string_view().bytes());
 }