Make global eval faster by lazily computing its call position.

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 6418 matching lines @@
   // [type]: the script type.
   DECL_INT_ACCESSORS(type)
 
   // [line_ends]: FixedArray of line ends positions.
   DECL_ACCESSORS(line_ends, Object)
 
   // [eval_from_shared]: for eval scripts the shared function info for the
   // function from which eval was called.
   DECL_ACCESSORS(eval_from_shared, Object)
 
-  // [eval_from_position]: the source position in the code for the
-  // function from which eval was called.
+  // [eval_from_position]: the source position in the code for the function
+  // from which eval was called, as positive integer. Or the code offset in the
+  // code from which eval was called, as negative integer.
   DECL_INT_ACCESSORS(eval_from_position)
 
   // [shared_function_infos]: weak fixed array containing all shared
   // function infos created from this script.
   DECL_ACCESSORS(shared_function_infos, Object)
 
   // [flags]: Holds an exciting bitfield.
   DECL_INT_ACCESSORS(flags)
 
   // [source_url]: sourceURL from magic comment
@@ skipping 32 matching lines @@
   // Convert code offset into column number.
   static int GetColumnNumber(Handle<Script> script, int code_offset);
 
   // Convert code offset into (zero-based) line number.
   // The non-handlified version does not allocate, but may be much slower.
   static int GetLineNumber(Handle<Script> script, int code_offset);
   int GetLineNumber(int code_pos);
 
   static Handle<Object> GetNameOrSourceURL(Handle<Script> script);
 
+  // Set eval origin for stack trace formatting.
+  static void SetEvalOrigin(Handle<Script> script,
+                            Handle<SharedFunctionInfo> outer,
+                            int eval_position);
+  // Retrieve source position from where eval was called.
+  int GetEvalPosition();
+
   // Init line_ends array with source code positions of line ends.
   static void InitLineEnds(Handle<Script> script);
 
   // Get the JS object wrapping the given script; create it if none exists.
   static Handle<JSObject> GetWrapper(Handle<Script> script);
 
   // Look through the list of existing shared function infos to find one
   // that matches the function literal.  Return empty handle if not found.
   MaybeHandle<SharedFunctionInfo> FindSharedFunctionInfo(FunctionLiteral* fun);
 
@@ skipping 4292 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_