Use a typed array for the irregexp stack.

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
diff --git a/runtime/vm/code_generator.cc b/runtime/vm/code_generator.cc
index 90e5ba5f7daf9d98d18dbdeeedbff4a9100ac361..73c4744db069492cd650a72dbf93d509b3a98ca0 100644
--- a/runtime/vm/code_generator.cc
+++ b/runtime/vm/code_generator.cc
@@ -1661,4 +1661,19 @@ DEFINE_RUNTIME_ENTRY(InitStaticField, 1) {
   field.EvaluateInitializer();
 }
 
+
+DEFINE_RUNTIME_ENTRY(GrowTypedData, 1) {

[Vyacheslav Egorov (Google), 2015/01/20 16:26:24]

The name is a bit confusing: but I can't come up with a better one.

Grow implies in-place grow which is not the case.

Maybe ReallocTypedData (parallel with realloc())?

[zerny-google, 2015/01/21 12:03:11]

Since I've changed the call to take a typed-data cell, as per your suggestion,
the Grow prefix is more fitting now. However, I'm fine with renaming to Realloc
if you like.

[Vyacheslav Egorov (Google), 2015/01/21 12:10:00]

Agreed. Maybe GrowRegExpStack then?

+  const TypedData& old_data = TypedData::CheckedHandle(arguments.ArgAt(0));
+  ASSERT(!old_data.IsNull());
+  const intptr_t cid = old_data.GetClassId();
+  const intptr_t old_size = old_data.Length();
+  const intptr_t new_size = 2 * old_size;
+  const intptr_t elm_size = old_data.ElementSizeInBytes();
+  const TypedData& new_data =
+      TypedData::Handle(TypedData::New(cid, new_size, Heap::kOld));
+  TypedData::Copy(new_data, 0, old_data, 0, old_size * elm_size);
+  arguments.SetReturn(new_data);
+}
+
+
 }  // namespace dart