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py: Add portable framework to query/check C stack usage.

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Such mechanism is important to get stable Python functioning, because Python
function calling is handled with C stack. The idea is to sprinkle
STACK_CHECK() calls in places where there can be C recursion.

TODO: Add more STACK_CHECK()'s.
This commit is contained in:
Paul Sokolovsky
2014-06-25 03:03:34 +03:00
parent 91b576d147
commit 23668698cb
6 changed files with 119 additions and 9 deletions
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6
py/objfun.c
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@@ -39,6 +39,7 @@
#include "runtime0.h"
#include "runtime.h"
#include "bc.h"
#include "stackctrl.h"
#if 0 // print debugging info
#define DEBUG_PRINT (1)
@@ -204,6 +205,8 @@ STATIC NORETURN void fun_pos_args_mismatch(mp_obj_fun_bc_t *f, uint expected, ui
// code_state should have ->ip filled in (pointing past code info block),
// as well as ->n_state.
void mp_setup_code_state(mp_code_state *code_state, mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
// This function is pretty complicated. It's main aim is to be efficient in speed and RAM
// usage for the common case of positional only args.
mp_obj_fun_bc_t *self = self_in;
machine_uint_t n_state = code_state->n_state;
const byte *ip = code_state->ip;
@@ -353,8 +356,7 @@ continue2:;
STATIC mp_obj_t fun_bc_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
// This function is pretty complicated. It's main aim is to be efficient in speed and RAM
// usage for the common case of positional only args.
STACK_CHECK();
DEBUG_printf("Input n_args: %d, n_kw: %d\n", n_args, n_kw);
DEBUG_printf("Input pos args: ");