Request for reviews (L): 6934494: JSR 292 MethodHandles adapters should be generated into their own CodeBlob

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/6934494/webrev.01/

Passing a null pointer to an InvokeDynamic function call, like:

  MethodHandle mh = null;
  InvokeDynamic.funcall(mh);

should lead to a NullPointerException. But with current HotSpot we
hit a guarantee:

  #  Internal Error (sharedRuntime.cpp:586), pid=4116, tid=3072834448
  #  Error: guarantee(cb->is_adapter_blob(),"exception happened outside interpreter, nmethods and vtable stubs (1)")

The reason for this is that the MethodHandles adapters are generated
into the same CodeBlob as other code stubs which do not throw
exceptions. The only blob that can throw exceptions is the C2I/I2C
adapter blob, and this what the guarantee says.

The fix is to generate MethodHandles adapters into their own CodeBlob
and add a check into the guarantee for that blob.

src/cpu/sparc/vm/stubRoutines_sparc.hpp
src/cpu/x86/vm/stubGenerator_x86_32.cpp
src/cpu/x86/vm/stubGenerator_x86_64.cpp
src/cpu/x86/vm/stubRoutines_x86_32.hpp
src/cpu/x86/vm/stubRoutines_x86_64.hpp
src/share/vm/code/codeBlob.cpp
src/share/vm/code/codeBlob.hpp
src/share/vm/includeDB_core
src/share/vm/prims/methodHandles.cpp
src/share/vm/prims/methodHandles.hpp
src/share/vm/runtime/init.cpp
src/share/vm/runtime/sharedRuntime.cpp
src/share/vm/runtime/sharedRuntime.hpp