JavaScript stubs have access to their calling convention and minor key now.

src/runtime.js

 // Copyright 2006-2008 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.
 
 // This files contains runtime support implemented in JavaScript.
 
 // CAUTION: Some of the functions specified in this file are called
 // directly from compiled code. These are the functions with names in
 // ALL CAPS. The compiled code passes the first argument in 'this'.
 
@@ skipping 46 matching lines @@
 var CONCAT_ITERABLE_TO_ARRAY;
 var APPLY_PREPARE;
 var REFLECT_APPLY_PREPARE;
 var REFLECT_CONSTRUCT_PREPARE;
 var STACK_OVERFLOW;
 var TO_OBJECT;
 var TO_NUMBER;
 var TO_STRING;
 var TO_NAME;
 
-var StringLengthTF_STUB;
-var StringAddTF_STUB;
-var MathFloor_STUB;
+var StringLengthTFStub;
+var StringAddTFStub;
+var MathFloorStub;
 
 var $defaultNumber;
 var $defaultString;
 var $NaN;
 var $nonNumberToNumber;
 var $nonStringToString;
 var $sameValue;
 var $sameValueZero;
 var $toBoolean;
 var $toInt32;
@@ skipping 680 matching lines @@
 TO_NAME = function TO_NAME() {
   return %$toName(this);
 }
 
 
 /* -----------------------------------------------
    - - -   J a v a S c r i p t   S t u b s   - - -
    -----------------------------------------------
 */
 
-StringLengthTF_STUB = function StringLengthTF_STUB(receiver, name, i, v) {
-  // i and v are dummy parameters mandated by the InterfaceDescriptor,
-  // (LoadWithVectorDescriptor).
-  return %_StringGetLength(%_JSValueGetValue(receiver));
+StringLengthTFStub = function StringLengthTFStub(call_conv, minor_key) {
+  var stub = function(receiver, name, i, v) {
+    // i and v are dummy parameters mandated by the InterfaceDescriptor,
+    // (LoadWithVectorDescriptor).
+    return %_StringGetLength(%_JSValueGetValue(receiver));
+  }
+  return stub;
 }
 
-StringAddTF_STUB = function StringAddTF_STUB(left, right) {
-  return %StringAdd(left, right);
+StringAddTFStub = function StringAddTFStub(call_conv, minor_key) {
+  var stub = function(left, right) {
+    return %StringAdd(left, right);
+  }
+  return stub;
 }
 
-MathFloor_STUB = function MathFloor_STUB(f, i, v) {
-  // |f| is calling function's JSFunction
-  // |i| is TypeFeedbackVector slot # of callee's CallIC for Math.floor call
-  // |v| is the value to floor
-  var r = %_MathFloor(+v);
-  if (%_IsMinusZero(r)) {
-    // Collect type feedback when the result of the floor is -0. This is
-    // accomplished by storing a sentinel in the second, "extra"
-    // TypeFeedbackVector slot corresponding to the Math.floor CallIC call in
-    // the caller's TypeVector.
-    %_FixedArraySet(%_GetTypeFeedbackVector(f), ((i|0)+1)|0, 1);
-    return -0;
+MathFloorStub = function MathFloorStub(call_conv, minor_key) {
+  var stub = function(f, i, v) {
+    // |f| is calling function's JSFunction
+    // |i| is TypeFeedbackVector slot # of callee's CallIC for Math.floor call
+    // |v| is the value to floor
+    var r = %_MathFloor(+v);
+    if (%_IsMinusZero(r)) {
+      // Collect type feedback when the result of the floor is -0. This is
+      // accomplished by storing a sentinel in the second, "extra"
+      // TypeFeedbackVector slot corresponding to the Math.floor CallIC call in
+      // the caller's TypeVector.
+      %_FixedArraySet(%_GetTypeFeedbackVector(f), ((i|0)+1)|0, 1);
+      return -0;
+    }
+    // Return integers in smi range as smis.
+    var trunc = r|0;
+    if (trunc === r) {
+      return trunc;
+    }
+    return r;
   }
-  // Return integers in smi range as smis.
-  var trunc = r|0;
-  if (trunc === r) {
-    return trunc;
-  }
-  return r;
+  return stub;
 }
 
 
 /* -------------------------------------
    - - -   C o n v e r s i o n s   - - -
    -------------------------------------
 */
 
 // ECMA-262, section 9.1, page 30. Use null/undefined for no hint,
 // (1) for number hint, and (2) for string hint.
@@ skipping 234 matching lines @@
 $toLength = ToLength;
 $toName = ToName;
 $toNumber = ToNumber;
 $toObject = ToObject;
 $toPositiveInteger = ToPositiveInteger;
 $toPrimitive = ToPrimitive;
 $toString = ToString;
 $toUint32 = ToUint32;
 
 })