Stop logging Builtin functions as LazyCompile.

Builtin functions were being logged via both LogCodeObjects and
LogCompiledFunctions. The latter assumes the code in question has a
Name and so would end up logging an unattributable entry. This patch
stops logging that entry.

Bug: v8:8061
Change-Id: I20e5a853b8a214a91191fa644083bac7af9dc2c4
Reviewed-on: https://chromium-review.googlesource.com/1177759Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55302}

src/log.cc

@@ -2231,9 +2231,6 @@ void ExistingCodeLogger::LogExistingFunction(
 #endif
       CALL_CODE_EVENT_HANDLER(CallbackEvent(shared->DebugName(), entry_point))
     }
-  } else {
-    CALL_CODE_EVENT_HANDLER(CodeCreateEvent(
-        tag, *code, *shared, ReadOnlyRoots(isolate_).empty_string()))
   }
 }
 

test/cctest/test-log.cc

@@ -30,6 +30,7 @@
 #include <unordered_set>
 #include <vector>
 #include "src/api-inl.h"
+#include "src/builtins/builtins.h"
 #include "src/log-utils.h"
 #include "src/log.h"
 #include "src/objects-inl.h"
@@ -164,6 +165,7 @@ class ScopedLoggerInitializer {
     return result;
   }
 
+  void LogCodeObjects() { logger_->LogCodeObjects(); }
   void LogCompiledFunctions() { logger_->LogCompiledFunctions(); }
 
   void StringEvent(const char* name, const char* value) {
@@ -889,3 +891,29 @@ TEST(LogFunctionEvents) {
   i::FLAG_log_function_events = false;
   isolate->Dispose();
 }
+
+TEST(BuiltinsNotLoggedAsLazyCompile) {
+  SETUP_FLAGS();
+  v8::Isolate::CreateParams create_params;
+  create_params.array_buffer_allocator = CcTest::array_buffer_allocator();
+  v8::Isolate* isolate = v8::Isolate::New(create_params);
+  {
+    ScopedLoggerInitializer logger(saved_log, saved_prof, isolate);
+
+    logger.LogCodeObjects();
+    logger.LogCompiledFunctions();
+    logger.StopLogging();
+
+    i::EmbeddedVector<char, 100> address_buffer;
+    i::Handle<i::Code> builtin = logger.i_isolate()->builtins()->builtin_handle(
+        i::Builtins::kStringPrototypeToLowerCaseIntl);
+    i::SNPrintF(address_buffer, ",0x%" V8PRIxPTR ",%d,",
+                builtin->InstructionStart(), builtin->InstructionSize());
+    std::string address(address_buffer.start());
+
+    // Should only be logged as "Builtin", not as "LazyCompile".
+    CHECK(logger.ContainsLine({"code-creation,Builtin,3,", address}));
+    CHECK(!logger.ContainsLine({"code-creation,LazyCompile,3,", address}));
+  }
+  isolate->Dispose();
+}