Added old data space allocation infrastructure for pretenuring.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 1d0d262fef93bb8f868e07258c4969218480965f..3827ddf24f6845220b07439543935bf413cc6bac 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -9274,6 +9274,27 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_AllocateInOldPointerSpace) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_AllocateInOldDataSpace) {
+  // Allocate a block of memory in old data space (filled with a filler).
+  // Use as fallback for allocation in generated code when old pointer space
+  // is full.
+  ASSERT(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Smi, size_smi, 0);
+  int size = size_smi->value();
+  RUNTIME_ASSERT(IsAligned(size, kPointerSize));
+  RUNTIME_ASSERT(size > 0);
+  Heap* heap = isolate->heap();
+  Object* allocation;
+  { MaybeObject* maybe_allocation =
+        heap->old_data_space()->AllocateRaw(size);
+    if (maybe_allocation->ToObject(&allocation)) {
+      heap->CreateFillerObjectAt(HeapObject::cast(allocation)->address(), size);
+    }
+    return maybe_allocation;

[mvstanton, 2013/05/28 07:11:11]

Aside from the assert involving MaxNewSpaceAllocationSize() and the pointer
(new_space(), old_pointer_space(), old_data_space()), these three runtime
allocation methods are the same. Could the assert be placed in
Runtime_AllocateInNewSpace, but have all the other code in a common method that
takes a Space pointer?

[Hannes Payer (out of office), 2013/05/28 09:06:07]

Thanks for the suggestion. I refactored the code. Moreover
MaxNewSpaceAllocationSize() should be also checked for old data space and old
pointer space allocation. I renamed MaxNewSpaceAllocationSize to
MaxRegularSpaceAllocationSize.

+  }
+}
+
+
 // Push an object unto an array of objects if it is not already in the
 // array.  Returns true if the element was pushed on the stack and
 // false otherwise.