Support old-space allocation in generated code (bump block only for now).

runtime/vm/heap.cc

Index: runtime/vm/heap.cc
===================================================================
--- runtime/vm/heap.cc	(revision 40250)
+++ runtime/vm/heap.cc	(working copy)
@@ -37,6 +37,7 @@
             "Trigger pretenuring when this many percent are promoted.");
 DEFINE_FLAG(int, pretenure_interval, 10,
             "Back off pretenuring after this many cycles.");
+DEFINE_FLAG(bool, pretenure_all, false, "Global pretenuring (for testing).");
 
 Heap::Heap(Isolate* isolate,
            intptr_t max_new_gen_semi_words,
@@ -393,16 +394,31 @@
 }
 
 
-uword Heap::TopAddress() {
-  return reinterpret_cast<uword>(new_space_->TopAddress());
+uword Heap::TopAddress(Heap::Space space) {
+  if (space == kNew) {
+    return reinterpret_cast<uword>(new_space_->TopAddress());
+  } else {
+    ASSERT(space == kPretenured);

[Ivan Posva, 2014/09/19 18:45:55]

Please add a TODO to the definition of kPretenured to mark the fact that this is
a temporary solution.

[koda, 2014/09/19 20:48:29]

Done.

+    return reinterpret_cast<uword>(old_space_->TopAddress());
+  }
 }
 
 
-uword Heap::EndAddress() {
-  return reinterpret_cast<uword>(new_space_->EndAddress());
+uword Heap::EndAddress(Heap::Space space) {
+  if (space == kNew) {
+    return reinterpret_cast<uword>(new_space_->EndAddress());
+  } else {
+    ASSERT(space == kPretenured);
+    return reinterpret_cast<uword>(old_space_->EndAddress());
+  }
 }
 
 
+Heap::Space Heap::SpaceForAllocation(intptr_t cid) const {
+  return FLAG_pretenure_all ? kPretenured : kNew;
+}
+
+
 void Heap::Init(Isolate* isolate,
                 intptr_t max_new_gen_words,
                 intptr_t max_old_gen_words) {