Truffle multithreaded language

[Timothy Baldridge]

In my continued investigations of Truffle I decided to see what happened
when I threw multiple threads at my AST.

What I have is a simple BF language with no specialization (we pass around
Objects and cast to ints/bytes as needed).

For this test, I parse the source code once, and then have 3 threads
execute the code over and over again. However when truffle kicks in (after
1000 total invocations of the function), I get the following error:

[thread:8] scope:
  [thread:8] scope: Truffle
    [thread:8] scope: Truffle.createGraph
      [thread:8] scope: Truffle.createGraph.InterceptException
      Exception occurred in scope: Truffle.createGraph.InterceptException
      Context obj java.lang.IllegalStateException: Inlined graph is in
invalid state
      Context obj
StructuredGraph:4{HotSpotMethod<OptimizedCallTarget.executeHelper(PackedFrame,
Arguments)>}
      Use -G:+DumpOnError to enable dumping of graphs on this error
      Context obj DebugDumpScope[Truffle: MainNode at 333bee49]
[truffle] opt failed MainNode at 333bee49
 java.lang.IllegalStateException: Inlined graph is in invalid state
java.lang.IllegalStateException: Inlined graph is in invalid state

I create a CallTarget per thread, but I do share the AST between all
threads.

How is this supposed to work in a large language? Am I expected to
duplicate the AST for every thread? And if so, how would I get something
like that to work with thread pools.

Thanks for the help,

Timothy Baldridge