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vm: Elaborate comments for WITH_CLEANUP, other cosmetic fixes.

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This commit is contained in:
Paul Sokolovsky 2014-03-29 16:49:33 +02:00
parent c9fd6645b0
commit 40d6d29af6
1 changed files with 7 additions and 4 deletions
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11
py/vm.c
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@ -391,6 +391,10 @@ dispatch_loop:
break; break;
case MP_BC_WITH_CLEANUP: { case MP_BC_WITH_CLEANUP: {
// Arriving here, there's "exception control block" on top of stack,
// and __exit__ bound method underneath it. Bytecode calls __exit__,
// and "deletes" it off stack, shifting "exception control block"
// to its place.
static const mp_obj_t no_exc[] = {mp_const_none, mp_const_none, mp_const_none}; static const mp_obj_t no_exc[] = {mp_const_none, mp_const_none, mp_const_none};
if (TOP() == mp_const_none) { if (TOP() == mp_const_none) {
sp--; sp--;
@ -432,8 +436,8 @@ dispatch_loop:
//PUSH(MP_OBJ_NEW_SMALL_INT(UNWIND_SILENCED)); //PUSH(MP_OBJ_NEW_SMALL_INT(UNWIND_SILENCED));
// But what we need to do is - pop exception from value stack... // But what we need to do is - pop exception from value stack...
sp -= 3; sp -= 3;
// ... pop with exception handler, and signal END_FINALLY // ... pop "with" exception handler, and signal END_FINALLY
// to just execute finally handler normally (signalled by None // to just execute finally handler normally (by pushing None
// on value stack) // on value stack)
assert(exc_sp >= exc_stack); assert(exc_sp >= exc_stack);
assert(exc_sp->opcode == MP_BC_SETUP_WITH); assert(exc_sp->opcode == MP_BC_SETUP_WITH);
@ -709,8 +713,7 @@ yield:
*exc_sp_in_out = MP_TAGPTR_MAKE(exc_sp, currently_in_except_block); *exc_sp_in_out = MP_TAGPTR_MAKE(exc_sp, currently_in_except_block);
return MP_VM_RETURN_YIELD; return MP_VM_RETURN_YIELD;
case MP_BC_YIELD_FROM: case MP_BC_YIELD_FROM: {
{
//#define EXC_MATCH(exc, type) MP_OBJ_IS_TYPE(exc, type) //#define EXC_MATCH(exc, type) MP_OBJ_IS_TYPE(exc, type)
#define EXC_MATCH(exc, type) mp_obj_exception_match(exc, type) #define EXC_MATCH(exc, type) mp_obj_exception_match(exc, type)
#define GENERATOR_EXIT_IF_NEEDED(t) if (t != MP_OBJ_NULL && EXC_MATCH(t, &mp_type_GeneratorExit)) { nlr_jump(t); } #define GENERATOR_EXIT_IF_NEEDED(t) if (t != MP_OBJ_NULL && EXC_MATCH(t, &mp_type_GeneratorExit)) { nlr_jump(t); }