Move remaining Message functions to C++

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index b517bef1fd1eb2d463b0a11fee3ba5425a7033dd..9cdedc1923f989790a4925cee4d0d33cf8e18737 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -18910,6 +18910,62 @@ void JSDate::SetCachedFields(int64_t local_time_ms, DateCache* date_cache) {
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
+namespace {
+
+Script* ScriptFromJSValue(Object* in) {
+  DCHECK(in->IsJSValue());
+  JSValue* jsvalue = JSValue::cast(in);
+  DCHECK(jsvalue->value()->IsScript());
+  return Script::cast(jsvalue->value());
+}
+
+}  // namespace
+
+int JSMessageObject::GetLineNumber() const {
+  if (start_position() == -1) return Message::kNoLineNumberInfo;
+
+  Handle<Script> the_script = handle(ScriptFromJSValue(script()));
+
+  Script::PositionInfo info;
+  const Script::OffsetFlag offset_flag = Script::WITH_OFFSET;
+  if (!the_script->GetPositionInfo(start_position(), &info, offset_flag)) {
+    return Message::kNoLineNumberInfo;
+  }
+
+  return info.line + 1;
+}
+
+int JSMessageObject::GetColumnNumber() const {
+  if (start_position() == -1) return -1;
+
+  Handle<Script> the_script = handle(ScriptFromJSValue(script()));
+
+  Script::PositionInfo info;
+  const Script::OffsetFlag offset_flag = Script::WITH_OFFSET;
+  if (!the_script->GetPositionInfo(start_position(), &info, offset_flag)) {
+    return -1;
+  }
+
+  return info.column;  // Note: No '+1' in contrast to GetLineNumber.
+}
+
+Handle<String> JSMessageObject::GetSourceLine() const {
+  Handle<Script> the_script = handle(ScriptFromJSValue(script()));
+
+  Isolate* isolate = the_script->GetIsolate();
+  if (the_script->type() == Script::TYPE_WASM) {
+    return isolate->factory()->empty_string();
+  }
+
+  Script::PositionInfo info;
+  const Script::OffsetFlag offset_flag = Script::WITH_OFFSET;
+  if (!the_script->GetPositionInfo(start_position(), &info, offset_flag)) {
+    return isolate->factory()->empty_string();
+  }
+
+  Handle<String> src = handle(String::cast(the_script->source()), isolate);
+  return isolate->factory()->NewSubString(src, info.line_start, info.line_end);
+}
 
 void JSArrayBuffer::Neuter() {
   CHECK(is_neuterable());