VM: New calling convention for generated code.

runtime/vm/deopt_instructions.cc

Index: runtime/vm/deopt_instructions.cc
diff --git a/runtime/vm/deopt_instructions.cc b/runtime/vm/deopt_instructions.cc
index 326076038cdcf46b8ea4850aaf0e691ef077196d..d0ae37b047ed30131ebc100eba9b93c28f298cd0 100644
--- a/runtime/vm/deopt_instructions.cc
+++ b/runtime/vm/deopt_instructions.cc
@@ -26,7 +26,8 @@ DeoptContext::DeoptContext(const StackFrame* frame,
                            const Code& code,
                            DestFrameOptions dest_options,
                            fpu_register_t* fpu_registers,
-                           intptr_t* cpu_registers)
+                           intptr_t* cpu_registers,
+                           bool is_lazy_deopt)
     : code_(code.raw()),
       object_pool_(code.GetObjectPool()),
       deopt_info_(TypedData::null()),
@@ -45,7 +46,8 @@ DeoptContext::DeoptContext(const StackFrame* frame,
       timeline_event_(NULL),
       deferred_slots_(NULL),
       deferred_objects_count_(0),
-      deferred_objects_(NULL) {
+      deferred_objects_(NULL),
+      is_lazy_deopt_(is_lazy_deopt) {
   const TypedData& deopt_info = TypedData::Handle(
       code.GetDeoptInfoAtPc(frame->pc(), &deopt_reason_, &deopt_flags_));
   ASSERT(!deopt_info.IsNull());
@@ -651,6 +653,16 @@ class DeoptPcMarkerInstr : public DeoptInstr {
   }
 
   void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
+    Function& function = Function::Handle(deopt_context->zone());
+    function ^= deopt_context->ObjectAt(object_table_index_);
+    if (function.IsNull()) {
+      StubCode* stub_code = deopt_context->thread()->isolate()->stub_code();
+      *reinterpret_cast<RawObject**>(dest_addr) =
+          deopt_context->is_lazy_deopt() ? stub_code->DeoptimizeLazyCode()
+                                         : stub_code->DeoptimizeCode();
+      return;
+    }
+
     *dest_addr = Smi::RawValue(0);
     deopt_context->DeferPcMarkerMaterialization(
         object_table_index_, dest_addr);