Last snapshot bits to get working precompiled hello_world on x64.

runtime/vm/megamorphic_cache_table.cc

Index: runtime/vm/megamorphic_cache_table.cc
diff --git a/runtime/vm/megamorphic_cache_table.cc b/runtime/vm/megamorphic_cache_table.cc
index 3bbc5291fc9fcd925c96c623c6cba1e8adac1b44..5757327020991fce9828674e5e573e69c1706384 100644
--- a/runtime/vm/megamorphic_cache_table.cc
+++ b/runtime/vm/megamorphic_cache_table.cc
@@ -55,6 +55,11 @@ void MegamorphicCacheTable::InitMissHandler() {
   const Code& code =
       Code::Handle(StubCode::Generate("_stub_MegamorphicMiss",
                                       StubCode::GenerateMegamorphicMissStub));
+  // When FLAG_lazy_dispatcher=false, this stub can be on the stack during
+  // exceptions, but it has a corresponding function so IsStubCode is false and
+  // it is considered in the search for an exception handler.
+  code.set_exception_handlers(Object::empty_exception_handlers());
+
   const Class& cls =
       Class::Handle(Type::Handle(Type::Function()).type_class());
   const Function& function =
@@ -102,4 +107,40 @@ void MegamorphicCacheTable::PrintSizes() {
             length_, size / 1024);
 }
 
+
+void MegamorphicCacheTable::ReadFrom(SnapshotReader* reader) {
+  ASSERT(reader->snapshot_code());
+
+  *reader->FunctionHandle() ^= reader->ReadObject();
+  miss_handler_function_ = reader->FunctionHandle()->raw();
+  miss_handler_code_ = reader->FunctionHandle()->CurrentCode();
+
+  capacity_ = reader->Read<intptr_t>();
+  length_ = capacity_;
+
+  table_ = reinterpret_cast<Entry*>(malloc(length_ * sizeof(*table_)));
+  for (intptr_t i = 0; i < length_; ++i) {
+    *reader->StringHandle() ^= reader->ReadObject();
+    table_[i].name = reader->StringHandle()->raw();
+    *reader->ArrayHandle() ^= reader->ReadObject();
+    table_[i].descriptor = reader->ArrayHandle()->raw();
+    *reader->MegamorphicCacheHandle() ^= reader->ReadObject();
+    table_[i].cache = reader->MegamorphicCacheHandle()->raw();
+  }
+}
+
+
+void MegamorphicCacheTable::WriteTo(SnapshotWriter* writer) {
+  ASSERT(writer->snapshot_code());
+
+  writer->WriteObject(miss_handler_function_);
+  writer->Write<intptr_t>(length_);
+  for (intptr_t i = 0; i < length_; i++) {
+    writer->WriteObject(table_[i].name);
+    writer->WriteObject(table_[i].descriptor);
+    writer->WriteObject(table_[i].cache);
+  }
+}

[siva, 2015/09/14 21:29:34]

This code is another CL and as discussed offline might go away.

[rmacnak, 2015/09/15 20:07:45]

Dropped.

+
+
 }  // namespace dart