py: Improvements to native emitter.

Native emitter can now compile try/except blocks using nlr_push/nlr_pop.
It probably only works for 1 level of exception handling.  It doesn't
work on Thumb (only x64).

Native emitter can also handle some additional op codes.

With this patch, 198 tests now pass using "-X emit=native" option to
micropython.

1 files changed, 5 insertions, 0 deletions

diff --git a/py/emit.h b/py/emit.h
index 874ec8819..03834cb21 100644
--- a/py/emit.h
+++ b/py/emit.h
@@ -134,6 +134,11 @@ typedef struct _emit_method_table_t {
     void (*yield_value)(emit_t *emit);
     void (*yield_from)(emit_t *emit);
 
+    // these methods are used to control entry to/exit from an exception handler
+    // they may or may not emit code
+    void (*start_except_handler)(emit_t *emit);
+    void (*end_except_handler)(emit_t *emit);
+
 #if MICROPY_EMIT_CPYTHON
     // these methods are only needed for emitcpy
     void (*load_const_verbatim_str)(emit_t *emit, const char *str);