128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <assert.h>
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "mpqstr.h"
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#include "obj.h"
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#include "runtime.h"
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#include "bc.h"
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/******************************************************************************/
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/* generator wrapper */
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typedef struct _mp_obj_gen_wrap_t {
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mp_obj_base_t base;
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uint n_state;
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mp_obj_t *fun;
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} mp_obj_gen_wrap_t;
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// args are in reverse order in the array
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mp_obj_t gen_wrap_call_n(mp_obj_t self_in, int n_args, const mp_obj_t *args) {
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mp_obj_gen_wrap_t *self = self_in;
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mp_obj_t self_fun = self->fun;
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assert(MP_OBJ_IS_TYPE(self_fun, &fun_bc_type));
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int bc_n_args;
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uint bc_n_state;
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const byte *bc_code;
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mp_obj_fun_bc_get(self_fun, &bc_n_args, &bc_n_state, &bc_code);
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if (n_args != bc_n_args) {
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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));
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}
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return mp_obj_new_gen_instance(bc_code, self->n_state, n_args, args);
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}
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const mp_obj_type_t gen_wrap_type = {
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{ &mp_const_type },
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"generator",
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NULL, // print
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NULL, // make_new
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gen_wrap_call_n, // call_n
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NULL, // unary_op
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NULL, // binary_op
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NULL, // getiter
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NULL, // iternext
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{{NULL, NULL},}, // method list
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};
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mp_obj_t mp_obj_new_gen_wrap(uint n_locals, uint n_stack, mp_obj_t fun) {
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mp_obj_gen_wrap_t *o = m_new_obj(mp_obj_gen_wrap_t);
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o->base.type = &gen_wrap_type;
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// 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;
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o->fun = fun;
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return o;
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}
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/******************************************************************************/
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/* generator instance */
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typedef struct _mp_obj_gen_instance_t {
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mp_obj_base_t base;
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const byte *ip;
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mp_obj_t *sp;
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mp_obj_t state[];
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} mp_obj_gen_instance_t;
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void gen_instance_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in) {
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print(env, "<generator object 'fun-name' at %p>", self_in);
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}
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mp_obj_t gen_instance_getiter(mp_obj_t self_in) {
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return self_in;
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}
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mp_obj_t gen_instance_iternext(mp_obj_t self_in) {
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mp_obj_gen_instance_t *self = self_in;
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bool yield = mp_execute_byte_code_2(&self->ip, &self->state[0], &self->sp);
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if (yield) {
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return *self->sp;
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} else {
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if (*self->sp == mp_const_none) {
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return mp_const_stop_iteration;
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} else {
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// TODO return StopIteration with value *self->sp
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return mp_const_stop_iteration;
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}
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}
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}
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const mp_obj_type_t gen_instance_type = {
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{ &mp_const_type },
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"generator",
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gen_instance_print, // print
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NULL, // make_new
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NULL, // call_n
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NULL, // unary_op
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NULL, // binary_op
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gen_instance_getiter, // getiter
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gen_instance_iternext, // iternext
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{{NULL, NULL},}, // method list
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};
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// args are in reverse order in the array
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mp_obj_t mp_obj_new_gen_instance(const byte *bytecode, uint n_state, int n_args, const mp_obj_t *args) {
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mp_obj_gen_instance_t *o = m_new_obj_var(mp_obj_gen_instance_t, mp_obj_t, n_state);
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o->base.type = &gen_instance_type;
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o->ip = bytecode;
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o->sp = o->state + n_state;
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// copy args (which are in reverse order) to start of state array
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for (int i = 0; i < n_args; i++) {
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o->state[i] = args[n_args - 1 - i];
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}
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// TODO
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// prelude for making cells (closed over variables)
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// for now we just make sure there are no cells variables
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// need to work out how to implement closed over variables in generators
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assert(o->ip[0] == 0);
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o->ip += 1;
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return o;
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}
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