Ignore debug stepin in optimized code for array builtins.

R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/251933004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@21013 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

diff --git a/src/array.js b/src/array.js
index 104fe3f..ab8bb39 100644 (file)
--- a/src/array.js
+++ b/src/array.js
@@ -1147,28 +1147,16 @@ function ArrayFilter(f, receiver) {
   var result = new $Array();
   var accumulator = new InternalArray();
   var accumulator_length = 0;
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        if (%_CallFunction(receiver, element, i, array, f)) {
-          accumulator[accumulator_length++] = element;
-        }
-      }
-    }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        if (%_CallFunction(receiver, element, i, array, f)) {
-          accumulator[accumulator_length++] = element;
-        }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      if (%_CallFunction(receiver, element, i, array, f)) {
+        accumulator[accumulator_length++] = element;
       }
     }
-    // End of duplicate.
   }
   %MoveArrayContents(accumulator, result);
   return result;
@@ -1192,24 +1180,14 @@ function ArrayForEach(f, receiver) {
     receiver = ToObject(receiver);
   }
 
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        %_CallFunction(receiver, element, i, array, f);
-      }
-    }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        %_CallFunction(receiver, element, i, array, f);
-      }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      %_CallFunction(receiver, element, i, array, f);
     }
-    // End of duplicate.
   }
 }
 
@@ -1233,24 +1211,14 @@ function ArraySome(f, receiver) {
     receiver = ToObject(receiver);
   }
 
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        if (%_CallFunction(receiver, element, i, array, f)) return true;
-      }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      if (%_CallFunction(receiver, element, i, array, f)) return true;
     }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        if (%_CallFunction(receiver, element, i, array, f)) return true;
-      }
-    }
-    // End of duplicate.
   }
   return false;
 }
@@ -1273,24 +1241,14 @@ function ArrayEvery(f, receiver) {
     receiver = ToObject(receiver);
   }
 
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        if (!%_CallFunction(receiver, element, i, array, f)) return false;
-      }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      if (!%_CallFunction(receiver, element, i, array, f)) return false;
     }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        if (!%_CallFunction(receiver, element, i, array, f)) return false;
-      }
-    }
-    // End of duplicate.
   }
   return true;
 }
@@ -1314,24 +1272,14 @@ function ArrayMap(f, receiver) {
 
   var result = new $Array();
   var accumulator = new InternalArray(length);
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        accumulator[i] = %_CallFunction(receiver, element, i, array, f);
-      }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      accumulator[i] = %_CallFunction(receiver, element, i, array, f);
     }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        accumulator[i] = %_CallFunction(receiver, element, i, array, f);
-      }
-    }
-    // End of duplicate.
   }
   %MoveArrayContents(accumulator, result);
   return result;
@@ -1471,27 +1419,14 @@ function ArrayReduce(callback, current) {
   }
 
   var receiver = %GetDefaultReceiver(callback);
-
-  if (%DebugCallbackSupportsStepping(callback)) {
-    for (; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(callback);
-        current =
-          %_CallFunction(receiver, current, element, i, array, callback);
-      }
+  var stepping = %_DebugCallbackSupportsStepping(callback);
+  for (; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(callback);
+      current = %_CallFunction(receiver, current, element, i, array, callback);
     }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        current =
-          %_CallFunction(receiver, current, element, i, array, callback);
-      }
-    }
-    // End of duplicate.
   }
   return current;
 }
@@ -1521,27 +1456,14 @@ function ArrayReduceRight(callback, current) {
   }
 
   var receiver = %GetDefaultReceiver(callback);
-
-  if (%DebugCallbackSupportsStepping(callback)) {
-    for (; i >= 0; i--) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(callback);
-        current =
-          %_CallFunction(receiver, current, element, i, array, callback);
-      }
-    }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (; i >= 0; i--) {
-      if (i in array) {
-        var element = array[i];
-        current =
-          %_CallFunction(receiver, current, element, i, array, callback);
-      }
+  var stepping = %_DebugCallbackSupportsStepping(callback);
+  for (; i >= 0; i--) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(callback);
+      current = %_CallFunction(receiver, current, element, i, array, callback);
     }
-    // End of duplicate.
   }
   return current;
 }

diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 76360c5..a41b80e 100644 (file)
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -11055,6 +11055,14 @@ void HOptimizedGraphBuilder::GenerateDebugBreakInOptimizedCode(
 }
 
 
+void HOptimizedGraphBuilder::GenerateDebugCallbackSupportsStepping(
+    CallRuntime* call) {
+  ASSERT(call->arguments()->length() == 1);
+  // Debugging is not supported in optimized code.
+  return ast_context()->ReturnValue(graph()->GetConstantFalse());
+}
+
+
 #undef CHECK_BAILOUT
 #undef CHECK_ALIVE
 

diff --git a/src/runtime.h b/src/runtime.h
index 3ce332b..9dca233 100644 (file)
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -97,7 +97,6 @@ namespace internal {
   F(SetNativeFlag, 1, 1) \
   F(SetInlineBuiltinFlag, 1, 1) \
   F(StoreArrayLiteralElement, 5, 1) \
-  F(DebugCallbackSupportsStepping, 1, 1) \
   F(DebugPrepareStepInIfStepping, 1, 1) \
   F(DebugPendingExceptionInPromise, 2, 1) \
   F(FlattenString, 1, 1) \
@@ -707,7 +706,9 @@ namespace internal {
   F(DoubleHi, 1, 1)                                                          \
   F(DoubleLo, 1, 1)                                                          \
   F(MathSqrt, 1, 1)                                                          \
-  F(MathLog, 1, 1)
+  F(MathLog, 1, 1)                                                           \
+  /* Debugger */                                                             \
+  F(DebugCallbackSupportsStepping, 1, 1)
 
 
 //---------------------------------------------------------------------------