[JSC] Include inliner information in SamplingProfiler JSON dump

https://bugs.webkit.org/show_bug.cgi?id=259995
rdar://113655463

Reviewed by Justin Michaud.

C++ SamplingProfiler::reportTopBytecodes has a feature showing inliner of the hot bytecodes.
This patch,

1. extends JSON dump with inliner information for each frame.
2. dumps inliner information as the same way to C++ SamplingProfiler::reportTopBytecodes from ruby script.

* Source/JavaScriptCore/runtime/SamplingProfiler.cpp:
(JSC::SamplingProfiler::stackTracesAsJSON):
* Tools/Scripts/display-sampling-profiler-output:

Canonical link: https://commits.webkit.org/266746@main

Source/JavaScriptCore/runtime/SamplingProfiler.cpp

@@ -1078,6 +1078,13 @@ Ref<JSON::Value> SamplingProfiler::stackTracesAsJSON()
         result->setString("name"_s, stackFrame.displayName(m_vm));
         result->setString("location"_s, descriptionForLocation(stackFrame.semanticLocation, stackFrame.wasmCompilationMode, stackFrame.wasmOffset));
         result->setString("category"_s, tierName(stackFrame));
+        if (std::optional<std::pair<StackFrame::CodeLocation, CodeBlock*>> machineLocation = stackFrame.machineLocation) {
+            auto inliner = JSON::Object::create();
+            inliner->setString("name"_s, String::fromUTF8(machineLocation->second->inferredName()));
+            inliner->setString("location"_s, descriptionForLocation(machineLocation->first, std::nullopt, BytecodeIndex()));
+            inliner->setString("category"_s, tierName(stackFrame));
+            result->setValue("inliner"_s, WTFMove(inliner));
+        }
         return result;
     };
 

Tools/Scripts/display-sampling-profiler-output

@@ -107,6 +107,10 @@ def reportTopBytecodes database
     next if stackTrace["frames"].empty?
     frame = stackTrace["frames"][0]
     description = "#{frame["name"]}#{frame["location"]}"
+    inliner = frame["inliner"]
+    unless inliner.nil?
+      description = "#{description} <-- #{inliner["name"]}#{inliner["location"]}"
+    end
     bytecodeCounts[description] += 1
     tierCounts[frame["category"]] += 1
     totalSamples += 1