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vm: Support strict stackless mode, with proper exception reporting.

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I.e. in this mode, C stack will never be used to call a Python function,
but if there's no free heap for a call, it will be reported as
RuntimeError (as expected), not MemoryError.
This commit is contained in:
Paul Sokolovsky 2015-03-28 01:14:45 +02:00
parent f0a8f21190
commit 7f1c98177b
4 changed files with 38 additions and 3 deletions
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10
py/mpconfig.h
View file

@ -125,11 +125,19 @@
#define MICROPY_QSTR_BYTES_IN_LEN (1)
#endif
// Avoid using C stack when making Python function calls.
// Avoid using C stack when making Python function calls. C stack still
// may be used if there's no free heap.
#ifndef MICROPY_STACKLESS
#define MICROPY_STACKLESS (0)
#endif
// Never use C stack when making Python function calls. This may break
// testsuite as will subtly change which exception is thrown in case
// of too deep recursion and other similar cases.
#ifndef MICROPY_STACKLESS_STRICT
#define MICROPY_STACKLESS_STRICT (0)
#endif
/*****************************************************************************/
/* Micro Python emitters */

1
py/runtime.h
View file

@ -130,6 +130,7 @@ void mp_import_all(mp_obj_t module);
// Raise NotImplementedError with given message
NORETURN void mp_not_implemented(const char *msg);
NORETURN void mp_exc_recursion_depth(void);
// helper functions for native/viper code
mp_uint_t mp_convert_obj_to_native(mp_obj_t obj, mp_uint_t type);

9
py/stackctrl.c
View file

@ -27,6 +27,7 @@
#include "py/mpstate.h"
#include "py/nlr.h"
#include "py/obj.h"
#include "py/runtime.h"
#include "py/stackctrl.h"
void mp_stack_ctrl_init(void) {
@ -46,10 +47,14 @@ void mp_stack_set_limit(mp_uint_t limit) {
MP_STATE_VM(stack_limit) = limit;
}
void mp_exc_recursion_depth(void) {
nlr_raise(mp_obj_new_exception_arg1(&mp_type_RuntimeError,
MP_OBJ_NEW_QSTR(MP_QSTR_maximum_space_recursion_space_depth_space_exceeded)));
}
void mp_stack_check(void) {
if (mp_stack_usage() >= MP_STATE_VM(stack_limit)) {
nlr_raise(mp_obj_new_exception_arg1(&mp_type_RuntimeError,
MP_OBJ_NEW_QSTR(MP_QSTR_maximum_space_recursion_space_depth_space_exceeded)));
mp_exc_recursion_depth();
}
}

21
py/vm.c
View file

@ -880,6 +880,12 @@ unwind_jump:;
nlr_pop();
goto run_code_state;
}
#if MICROPY_STACKLESS_STRICT
else {
deep_recursion_error:
mp_exc_recursion_depth();
}
#endif
}
#endif
SET_TOP(mp_call_function_n_kw(*sp, unum & 0xff, (unum >> 8) & 0xff, sp + 1));
@ -912,6 +918,11 @@ unwind_jump:;
nlr_pop();
goto run_code_state;
}
#if MICROPY_STACKLESS_STRICT
else {
goto deep_recursion_error;
}
#endif
}
#endif
SET_TOP(mp_call_method_n_kw_var(false, unum, sp));
@ -941,6 +952,11 @@ unwind_jump:;
nlr_pop();
goto run_code_state;
}
#if MICROPY_STACKLESS_STRICT
else {
goto deep_recursion_error;
}
#endif
}
#endif
SET_TOP(mp_call_method_n_kw(unum & 0xff, (unum >> 8) & 0xff, sp));
@ -973,6 +989,11 @@ unwind_jump:;
nlr_pop();
goto run_code_state;
}
#if MICROPY_STACKLESS_STRICT
else {
goto deep_recursion_error;
}
#endif
}
#endif
SET_TOP(mp_call_method_n_kw_var(true, unum, sp));