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py: Add new cstack API for stack checking, with limit margin macro.

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Currently the stack limit margin is hard-coded in each port's call to
`mp_stack_set_limit()`, but on threaded ports it's fiddlier and can lead to
bugs (such as incorrect thread stack margin on esp32).

This commit provides a new API to initialise the C Stack in one function
call, with a config macro to set the margin.  Where possible the new call
is inlined to reduce code size in thread-free ports.

Intended replacement for `MP_TASK_STACK_LIMIT_MARGIN` on esp32.

The previous `stackctrl.h` API is still present and unmodified apart from a
deprecation comment.  However it's not available when the
`MICROPY_PREVIEW_VERSION_2` macro is set.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>
This commit is contained in:
Angus Gratton
2024-08-06 15:51:22 +10:00
committed by Damien George
parent 6c870dc5ec
commit 86f2c285eb
18 changed files with 167 additions and 27 deletions
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4
py/objgenerator.c
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@@ -33,7 +33,7 @@
#include "py/objstr.h"
#include "py/objgenerator.h"
#include "py/objfun.h"
#include "py/stackctrl.h"
#include "py/cstack.h"
// Instance of GeneratorExit exception - needed by generator.close()
const mp_obj_exception_t mp_const_GeneratorExit_obj = {{&mp_type_GeneratorExit}, 0, 0, NULL, (mp_obj_tuple_t *)&mp_const_empty_tuple_obj};
@@ -151,7 +151,7 @@ static void gen_instance_print(const mp_print_t *print, mp_obj_t self_in, mp_pri
}
mp_vm_return_kind_t mp_obj_gen_resume(mp_obj_t self_in, mp_obj_t send_value, mp_obj_t throw_value, mp_obj_t *ret_val) {
MP_STACK_CHECK();
mp_cstack_check();
mp_check_self(mp_obj_is_type(self_in, &mp_type_gen_instance));
mp_obj_gen_instance_t *self = MP_OBJ_TO_PTR(self_in);
if (self->code_state.ip == 0) {