Refactor script position calculation

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index c10b5eb3e6a5d73156e439a6c151b7de400c1c8c..a721e3bdb127d03b297e60da81312a37e0d79e77 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -551,28 +551,17 @@ class CaptureStackTraceHelper {
     Handle<Script> script(Script::cast(fun->shared()->script()));
 
     if (!line_key_.is_null()) {
-      int script_line_offset = script->line_offset();
-      int line_number = Script::GetLineNumber(script, position);
-      // line_number is already shifted by the script_line_offset.
-      int relative_line_number = line_number - script_line_offset;
-      if (!column_key_.is_null() && relative_line_number >= 0) {
-        Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends()));
-        int start =
-            (relative_line_number == 0)
-                ? 0
-                : Smi::cast(line_ends->get(relative_line_number - 1))->value() +
-                      1;
-        int column_offset = position - start;
-        if (relative_line_number == 0) {
-          // For the case where the code is on the same line as the script tag.
-          column_offset += script->column_offset();
-        }
+      Script::PositionInfo info;
+      bool valid_pos =
+          script->GetPositionInfo(position, &info, Script::WITH_OFFSET);
+
+      if (!column_key_.is_null() && valid_pos) {
         JSObject::AddProperty(stack_frame, column_key_,
-                              handle(Smi::FromInt(column_offset + 1), isolate_),
+                              handle(Smi::FromInt(info.column + 1), isolate_),
                               NONE);
       }
       JSObject::AddProperty(stack_frame, line_key_,
-                            handle(Smi::FromInt(line_number + 1), isolate_),
+                            handle(Smi::FromInt(info.line + 1), isolate_),
                             NONE);
     }