[log] fix boolean logic on LogCodeObject

R=yangguo@google.com

Change-Id: Icb4825344991e5b2d15050e037064c60eeb9617e
Reviewed-on: https://chromium-review.googlesource.com/1097578Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53777}

src/log.cc

@@ -2023,7 +2023,7 @@ void ExistingCodeLogger::LogCodeObject(Object* object) {
       break;
     case AbstractCode::BUILTIN:
       if (Code::cast(object)->is_interpreter_trampoline_builtin() &&
-          Code::cast(object) ==
+          Code::cast(object) !=
               *BUILTIN_CODE(isolate_, InterpreterEntryTrampoline)) {
         return;
       }

test/cctest/test-log.cc

@@ -36,6 +36,9 @@
 
 #include <unordered_set>
 #include <vector>
+// The C++ style guide recommends using <re2> instead of <regex>. However, the
+// former isn't available in V8.
+#include <regex>  // NOLINT(build/c++11)
 #include "src/api.h"
 #include "src/log-utils.h"
 #include "src/log.h"
@@ -257,30 +260,41 @@ class TestCodeEventHandler : public v8::CodeEventHandler {
   explicit TestCodeEventHandler(v8::Isolate* isolate)
       : v8::CodeEventHandler(isolate) {}
 
-  const char* FindLine(const char* prefix, const char* suffix = nullptr,
-                       const char* start = nullptr) {
-    if (!log_.length()) return NULL;
-    const char* c_log = log_.c_str();
-    if (start == nullptr) start = c_log;
-    const char* end = c_log + log_.length();
-    return FindLogLine(start, end, prefix, suffix);
+  size_t CountLines(std::string prefix, std::string suffix = std::string()) {
+    if (!log_.length()) return 0;
+
+    std::regex expression("(^|\\n)" + prefix + ".*" + suffix + "(?=\\n|$)");
+
+    size_t match_count(std::distance(
+        std::sregex_iterator(log_.begin(), log_.end(), expression),
+        std::sregex_iterator()));
+
+    return match_count;
   }
 
   void Handle(v8::CodeEvent* code_event) override {
-    const char* code_type =
-        v8::CodeEvent::GetCodeEventTypeName(code_event->GetCodeType());
-    char function_name[1000];
-    strncpy(function_name, code_type, 1000);
-    function_name[strlen(code_type)] = ' ';
-    code_event->GetFunctionName()->WriteUtf8(
-        function_name + strlen(code_type) + 1, 1000);
-    function_name[strlen(function_name) + 1] = '\0';
-    function_name[strlen(function_name)] = '\n';
-
-    log_ += std::string(function_name);
+    std::string log_line = "";
+    log_line += v8::CodeEvent::GetCodeEventTypeName(code_event->GetCodeType());
+    log_line += " ";
+    log_line += FormatName(code_event);
+    log_line += "\n";
+    log_ += log_line;
   }
 
  private:
+  std::string FormatName(v8::CodeEvent* code_event) {
+    std::string name = std::string(code_event->GetComment());
+    if (name.empty()) {
+      v8::Local<v8::String> functionName = code_event->GetFunctionName();
+      std::string buffer(functionName->Utf8Length() + 1, 0);
+      functionName->WriteUtf8(&buffer[0], functionName->Utf8Length() + 1);
+      // Sanitize name, removing unwanted \0 resulted from WriteUtf8
+      name = std::string(buffer.c_str());
+    }
+
+    return name;
+  }
+
   std::string log_;
 };
 
@@ -854,21 +868,24 @@ TEST(ExternalCodeEventListener) {
         "testCodeEventListenerBeforeStart('1', 1);";
     CompileRun(source_text_before_start);
 
-    CHECK_NULL(code_event_handler.FindLine("LazyCompile",
-                                           "testCodeEventListenerBeforeStart"));
+    CHECK_EQ(code_event_handler.CountLines("LazyCompile",
+                                           "testCodeEventListenerBeforeStart"),
+             0);
 
     code_event_handler.Enable();
 
-    CHECK_NOT_NULL(code_event_handler.FindLine(
-        "LazyCompile", "testCodeEventListenerBeforeStart"));
+    CHECK_GE(code_event_handler.CountLines("LazyCompile",
+                                           "testCodeEventListenerBeforeStart"),
+             1);
 
     const char* source_text_after_start =
         "function testCodeEventListenerAfterStart(a,b) { return a + b };"
         "testCodeEventListenerAfterStart('1', 1);";
     CompileRun(source_text_after_start);
 
-    CHECK_NOT_NULL(code_event_handler.FindLine(
-        "LazyCompile", "testCodeEventListenerAfterStart"));
+    CHECK_GE(code_event_handler.CountLines("LazyCompile",
+                                           "testCodeEventListenerAfterStart"),
+             1);
 
     context->Exit();
   }
@@ -897,21 +914,28 @@ TEST(ExternalCodeEventListenerWithInterpretedFramesNativeStack) {
         "testCodeEventListenerBeforeStart('1', 1);";
     CompileRun(source_text_before_start);
 
-    CHECK_NULL(code_event_handler.FindLine("InterpretedFunction",
-                                           "testCodeEventListenerBeforeStart"));
+    CHECK_EQ(code_event_handler.CountLines("InterpretedFunction",
+                                           "testCodeEventListenerBeforeStart"),
+             0);
 
     code_event_handler.Enable();
 
-    CHECK_NOT_NULL(code_event_handler.FindLine(
-        "InterpretedFunction", "testCodeEventListenerBeforeStart"));
+    CHECK_GE(code_event_handler.CountLines("InterpretedFunction",
+                                           "testCodeEventListenerBeforeStart"),
+             1);
 
     const char* source_text_after_start =
         "function testCodeEventListenerAfterStart(a,b) { return a + b };"
         "testCodeEventListenerAfterStart('1', 1);";
     CompileRun(source_text_after_start);
 
-    CHECK_NOT_NULL(code_event_handler.FindLine(
-        "InterpretedFunction", "testCodeEventListenerAfterStart"));
+    CHECK_GE(code_event_handler.CountLines("InterpretedFunction",
+                                           "testCodeEventListenerAfterStart"),
+             1);
+
+    CHECK_EQ(
+        code_event_handler.CountLines("Builtin", "InterpreterEntryTrampoline"),
+        1);
 
     context->Exit();
   }