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py: Add mp_pending_exception global variable, for VM soft interrupt.

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This allows to implement KeyboardInterrupt on unix, and a much safer
ctrl-C in stmhal port.  First ctrl-C is a soft one, with hope that VM
will notice it; second ctrl-C is a hard one that kills anything (for
both unix and stmhal).

One needs to check for a pending exception in the VM only for jump
opcodes.  Others can't produce an infinite loop (infinite recursion is
caught by stack check).
This commit is contained in:
Damien George
2014-10-25 18:19:55 +01:00
parent d7353fe6fe
commit 124df6f8d0
10 changed files with 71 additions and 14 deletions
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2
py/objexcept.c
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@@ -211,7 +211,7 @@ const mp_obj_type_t mp_type_ ## exc_name = { \
// http://docs.python.org/3/library/exceptions.html
MP_DEFINE_EXCEPTION_BASE(BaseException)
MP_DEFINE_EXCEPTION(SystemExit, BaseException)
//MP_DEFINE_EXCEPTION(KeyboardInterrupt, BaseException)
MP_DEFINE_EXCEPTION(KeyboardInterrupt, BaseException)
MP_DEFINE_EXCEPTION(GeneratorExit, BaseException)
MP_DEFINE_EXCEPTION(Exception, BaseException)
MP_DEFINE_EXCEPTION_BASE(Exception)