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py/objfun, vm: Add comments on codestate allocation in stackless mode.

pull/1/head
Paul Sokolovsky 2017-12-09 10:57:40 +02:00
parent fca1d1aa62
commit d72370def7
2 changed files with 17 additions and 1 deletions
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6
py/objfun.c
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@ -218,8 +218,12 @@ mp_code_state_t *mp_obj_fun_bc_prepare_codestate(mp_obj_t self_in, size_t n_args
size_t n_state, state_size;
DECODE_CODESTATE_SIZE(self->bytecode, n_state, state_size);
// allocate state for locals and stack
mp_code_state_t *code_state;
// If we use m_new_obj_var(), then on no memory, MemoryError will be
// raised. But this is not correct exception for a function call,
// RuntimeError should be raised instead. So, we use m_new_obj_var_maybe(),
// return NULL, then vm.c takes the needed action (either raise
// RuntimeError or fallback to stack allocation).
code_state = m_new_obj_var_maybe(mp_code_state_t, byte, state_size);
if (!code_state) {
return NULL;

12
py/vm.c
View File

@ -937,6 +937,9 @@ unwind_jump:;
deep_recursion_error:
mp_exc_recursion_depth();
}
#else
// If we couldn't allocate codestate on heap, in
// non non-strict case fall thru to stack allocation.
#endif
}
#endif
@ -974,6 +977,9 @@ unwind_jump:;
else {
goto deep_recursion_error;
}
#else
// If we couldn't allocate codestate on heap, in
// non non-strict case fall thru to stack allocation.
#endif
}
#endif
@ -1008,6 +1014,9 @@ unwind_jump:;
else {
goto deep_recursion_error;
}
#else
// If we couldn't allocate codestate on heap, in
// non non-strict case fall thru to stack allocation.
#endif
}
#endif
@ -1045,6 +1054,9 @@ unwind_jump:;
else {
goto deep_recursion_error;
}
#else
// If we couldn't allocate codestate on heap, in
// non non-strict case fall thru to stack allocation.
#endif
}
#endif