circuitpython/py/objgenerator.c

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#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "mpqstr.h"
#include "obj.h"
#include "runtime.h"
#include "bc.h"
/******************************************************************************/
/* generator wrapper */
typedef struct _mp_obj_gen_wrap_t {
mp_obj_base_t base;
uint n_state;
mp_obj_t *fun;
} mp_obj_gen_wrap_t;
mp_obj_t gen_wrap_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_obj_gen_wrap_t *self = self_in;
mp_obj_t self_fun = self->fun;
assert(MP_OBJ_IS_TYPE(self_fun, &fun_bc_type));
int bc_n_args;
uint bc_n_state;
const byte *bc_code;
mp_obj_fun_bc_get(self_fun, &bc_n_args, &bc_n_state, &bc_code);
if (n_args != bc_n_args) {
nlr_jump(mp_obj_new_exception_msg_2_args(MP_QSTR_TypeError, "function takes %d positional arguments but %d were given", (const char*)(machine_int_t)bc_n_args, (const char*)(machine_int_t)n_args));
}
if (n_kw != 0) {
nlr_jump(mp_obj_new_exception_msg(MP_QSTR_TypeError, "function does not take keyword arguments"));
}
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return mp_obj_new_gen_instance(bc_code, self->n_state, n_args, args);
}
const mp_obj_type_t gen_wrap_type = {
{ &mp_const_type },
"generator",
.call = gen_wrap_call,
};
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mp_obj_t mp_obj_new_gen_wrap(uint n_locals, uint n_stack, mp_obj_t fun) {
mp_obj_gen_wrap_t *o = m_new_obj(mp_obj_gen_wrap_t);
o->base.type = &gen_wrap_type;
// we have at least 3 locals so the bc can write back fast[0,1,2] safely; should improve how this is done
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o->n_state = (n_locals < 3 ? 3 : n_locals) + n_stack;
o->fun = fun;
return o;
}
/******************************************************************************/
/* generator instance */
typedef struct _mp_obj_gen_instance_t {
mp_obj_base_t base;
const byte *code_info;
const byte *ip;
mp_obj_t *sp;
uint n_state;
mp_obj_t state[];
} mp_obj_gen_instance_t;
void gen_instance_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
print(env, "<generator object 'fun-name' at %p>", self_in);
}
mp_obj_t gen_instance_getiter(mp_obj_t self_in) {
return self_in;
}
mp_obj_t gen_instance_iternext(mp_obj_t self_in) {
mp_obj_gen_instance_t *self = self_in;
bool yield = mp_execute_byte_code_2(self->code_info, &self->ip, &self->state[self->n_state - 1], &self->sp);
if (yield) {
return *self->sp;
} else {
if (*self->sp == mp_const_none) {
return mp_const_stop_iteration;
} else {
// TODO return StopIteration with value *self->sp
return mp_const_stop_iteration;
}
}
}
const mp_obj_type_t gen_instance_type = {
{ &mp_const_type },
"generator",
.print = gen_instance_print,
.getiter = gen_instance_getiter,
.iternext = gen_instance_iternext,
};
mp_obj_t mp_obj_new_gen_instance(const byte *bytecode, uint n_state, int n_args, const mp_obj_t *args) {
mp_obj_gen_instance_t *o = m_new_obj_var(mp_obj_gen_instance_t, mp_obj_t, n_state);
o->base.type = &gen_instance_type;
o->code_info = bytecode;
o->ip = bytecode;
o->sp = &o->state[0] - 1; // sp points to top of stack, which starts off 1 below the state
o->n_state = n_state;
// copy args to end of state array, in reverse (that's how mp_execute_byte_code_2 needs it)
for (int i = 0; i < n_args; i++) {
o->state[n_state - 1 - i] = args[i];
}
// TODO
// prelude for making cells (closed over variables)
// for now we just make sure there are no cells variables
// need to work out how to implement closed over variables in generators
// get code info size
machine_uint_t code_info_size = bytecode[0] | (bytecode[1] << 8) | (bytecode[2] << 16) | (bytecode[3] << 24);
o->ip += code_info_size;
assert(o->ip[0] == 0);
o->ip += 1;
return o;
}