Revert of [debugger] flood function for stepping before calling it.

src/js/array.js

 // Copyright 2012 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.
 
 (function(global, utils, extrasUtils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 1194 matching lines @@
 
 // The following functions cannot be made efficient on sparse arrays while
 // preserving the semantics, since the calls to the receiver function can add
 // or delete elements from the array.
 function InnerArrayFilter(f, receiver, array, length) {
   if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 
   var accumulator = new InternalArray();
   var accumulator_length = 0;
   var is_array = IS_ARRAY(array);
+  var stepping = DEBUG_IS_STEPPING(f);
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
       if (%_Call(f, receiver, element, i, array)) {
         accumulator[accumulator_length++] = element;
       }
     }
   }
   var result = new GlobalArray();
   %MoveArrayContents(accumulator, result);
   return result;
 }
 
 
 function ArrayFilter(f, receiver) {
   CHECK_OBJECT_COERCIBLE(this, "Array.prototype.filter");
 
   // Pull out the length so that modifications to the length in the
   // loop will not affect the looping and side effects are visible.
   var array = TO_OBJECT(this);
   var length = TO_LENGTH_OR_UINT32(array.length);
   return InnerArrayFilter(f, receiver, array, length);
 }
 
 
 function InnerArrayForEach(f, receiver, array, length) {
   if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 
   var is_array = IS_ARRAY(array);
+  var stepping = DEBUG_IS_STEPPING(f);
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
       %_Call(f, receiver, element, i, array);
     }
   }
 }
 
 
 function ArrayForEach(f, receiver) {
   CHECK_OBJECT_COERCIBLE(this, "Array.prototype.forEach");
 
   // Pull out the length so that modifications to the length in the
   // loop will not affect the looping and side effects are visible.
   var array = TO_OBJECT(this);
   var length = TO_LENGTH_OR_UINT32(array.length);
   InnerArrayForEach(f, receiver, array, length);
 }
 
 
 function InnerArraySome(f, receiver, array, length) {
   if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 
   var is_array = IS_ARRAY(array);
+  var stepping = DEBUG_IS_STEPPING(f);
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
       if (%_Call(f, receiver, element, i, array)) return true;
     }
   }
   return false;
 }
 
 
 // Executes the function once for each element present in the
 // array until it finds one where callback returns true.
 function ArraySome(f, receiver) {
   CHECK_OBJECT_COERCIBLE(this, "Array.prototype.some");
 
   // Pull out the length so that modifications to the length in the
   // loop will not affect the looping and side effects are visible.
   var array = TO_OBJECT(this);
   var length = TO_LENGTH_OR_UINT32(array.length);
   return InnerArraySome(f, receiver, array, length);
 }
 
 
 function InnerArrayEvery(f, receiver, array, length) {
   if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 
   var is_array = IS_ARRAY(array);
+  var stepping = DEBUG_IS_STEPPING(f);
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
       if (!%_Call(f, receiver, element, i, array)) return false;
     }
   }
   return true;
 }
 
 function ArrayEvery(f, receiver) {
   CHECK_OBJECT_COERCIBLE(this, "Array.prototype.every");
 
   // Pull out the length so that modifications to the length in the
   // loop will not affect the looping and side effects are visible.
   var array = TO_OBJECT(this);
   var length = TO_LENGTH_OR_UINT32(array.length);
   return InnerArrayEvery(f, receiver, array, length);
 }
 
 
 function InnerArrayMap(f, receiver, array, length) {
   if (!IS_CALLABLE(f)) throw MakeTypeError(kCalledNonCallable, f);
 
   var accumulator = new InternalArray(length);
   var is_array = IS_ARRAY(array);
+  var stepping = DEBUG_IS_STEPPING(f);
   for (var i = 0; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
       accumulator[i] = %_Call(f, receiver, element, i, array);
     }
   }
   var result = new GlobalArray();
   %MoveArrayContents(accumulator, result);
   return result;
 }
 
 
 function ArrayMap(f, receiver) {
@@ skipping 142 matching lines @@
   find_initial: if (argumentsLength < 2) {
     for (; i < length; i++) {
       if (HAS_INDEX(array, i, is_array)) {
         current = array[i++];
         break find_initial;
       }
     }
     throw MakeTypeError(kReduceNoInitial);
   }
 
+  var stepping = DEBUG_IS_STEPPING(callback);
   for (; i < length; i++) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(callback);
       current = callback(current, element, i, array);
     }
   }
   return current;
 }
 
 
 function ArrayReduce(callback, current) {
   CHECK_OBJECT_COERCIBLE(this, "Array.prototype.reduce");
 
@@ skipping 17 matching lines @@
   find_initial: if (argumentsLength < 2) {
     for (; i >= 0; i--) {
       if (HAS_INDEX(array, i, is_array)) {
         current = array[i--];
         break find_initial;
       }
     }
     throw MakeTypeError(kReduceNoInitial);
   }
 
+  var stepping = DEBUG_IS_STEPPING(callback);
   for (; i >= 0; i--) {
     if (HAS_INDEX(array, i, is_array)) {
       var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(callback);
       current = callback(current, element, i, array);
     }
   }
   return current;
 }
 
 
 function ArrayReduceRight(callback, current) {
   CHECK_OBJECT_COERCIBLE(this, "Array.prototype.reduceRight");
 
@@ skipping 391 matching lines @@
 %InstallToContext([
   "array_pop", ArrayPop,
   "array_push", ArrayPush,
   "array_shift", ArrayShift,
   "array_splice", ArraySplice,
   "array_slice", ArraySlice,
   "array_unshift", ArrayUnshift,
 ]);
 
 });