[wasm][arm] Add an additional stack check for functions with big frames.

src/runtime/runtime-wasm.cc

Index: src/runtime/runtime-wasm.cc
diff --git a/src/runtime/runtime-wasm.cc b/src/runtime/runtime-wasm.cc
index 9320c800acfb90d5cd6f291917dd4d31d74e5be4..a8675b50e5a1a2026c518f0d38004ca50a7d4c90 100644
--- a/src/runtime/runtime-wasm.cc
+++ b/src/runtime/runtime-wasm.cc
@@ -136,6 +136,15 @@ RUNTIME_FUNCTION(Runtime_ThrowWasmError) {
   return ThrowRuntimeError(isolate, message_id, byte_offset, true);
 }
 
+RUNTIME_FUNCTION(Runtime_ThrowWasmStackOverflow) {
+  HandleScope scope(isolate);
+  DCHECK_NULL(isolate->context());
+  isolate->set_context(GetWasmContextOnStackTop(isolate));
+  SealHandleScope shs(isolate);

[Michael Starzinger, 2017/03/20 14:54:51]

nit: The {Isolate::StackOverflow} method creates its own handle scope, not much
sense in sealing the current one I think. Can we just drop this?

[ahaas, 2017/03/20 15:16:23]

I removed the HandleScope and moved the SealHandleScope to line 1.

+  DCHECK_LE(0, args.length());

[Michael Starzinger, 2017/03/20 14:54:51]

nit: DCHECK_EQ? Also, please move the check up to right after the HandleScope,
to keep it in sync with other runtime functions.

[ahaas, 2017/03/20 15:16:23]

Done.

+  return isolate->StackOverflow();
+}
+
 RUNTIME_FUNCTION(Runtime_WasmThrowTypeError) {
   HandleScope scope(isolate);
   DCHECK_EQ(0, args.length());