Avoid massive stack frames by allocating 64k buffers in the heap.

runtime/bin/filter.cc

Index: runtime/bin/filter.cc
diff --git a/runtime/bin/filter.cc b/runtime/bin/filter.cc
index 3515052321aaa0221069f1fabaed5963c42abc1d..19d97de8b2777d0bab0f3858e5f878db9a0690ab 100644
--- a/runtime/bin/filter.cc
+++ b/runtime/bin/filter.cc
@@ -133,11 +133,12 @@ void FUNCTION_NAME(Filter_Processed)(Dart_NativeArguments args) {
     Dart_ThrowException(DartUtils::NewInternalError(
         "Failed to get 'flush' parameter"));
   }
-  uint8_t buffer[kFilterBufferLength];
+  uint8_t* buffer = new uint8_t[kFilterBufferLength];

[siva, 2013/03/15 07:47:00]

Not sure how frequently this function is called but it might be worthwhile
adding this buffer to the Filter object then you won't have to allocate and
delete on every call.

[Mads Ager (google), 2013/03/15 09:24:56]

I don't have any data on how often this is called either. But it is simple to
allocate it as part of the filter. Thanks!

   intptr_t read = filter->Processed(buffer, kFilterBufferLength, flush);
   if (read < 0) {
     // Error, end filter.
     EndFilter(filter_obj, filter);
+    delete[] buffer;
     Dart_ThrowException(DartUtils::NewInternalError(
         "Filter error, bad data"));
   } else if (read == 0) {
@@ -148,6 +149,7 @@ void FUNCTION_NAME(Filter_Processed)(Dart_NativeArguments args) {
     memmove(io_buffer, buffer, read);
     Dart_SetReturnValue(args, result);
   }
+  delete[] buffer;
   Dart_ExitScope();
 }