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py: Fix generator where state array was incorrectly indexed.

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Generator objects now allocate the object and the state in one malloc.
This improvement fixes Issue #38.
This commit is contained in:
Damien George 2014-01-02 20:57:05 +00:00
parent ebd2e8702d
commit 0ff883904a
3 changed files with 26 additions and 26 deletions
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2
py/obj.h
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@ -136,7 +136,7 @@ mp_obj_t mp_obj_new_range_iterator(int cur, int stop, int step);
mp_obj_t mp_obj_new_fun_bc(int n_args, uint n_state, const byte *code);
mp_obj_t mp_obj_new_fun_asm(uint n_args, void *fun);
mp_obj_t mp_obj_new_gen_wrap(uint n_locals, uint n_stack, mp_obj_t fun);
mp_obj_t mp_obj_new_gen_instance(mp_obj_t state, const byte *ip, mp_obj_t *sp);
mp_obj_t mp_obj_new_gen_instance(const byte *bytecode, uint n_state, int n_args, const mp_obj_t *args);
mp_obj_t mp_obj_new_closure(mp_obj_t fun, mp_obj_t closure_tuple);
mp_obj_t mp_obj_new_tuple(uint n, mp_obj_t *items);
mp_obj_t mp_obj_new_tuple_reverse(uint n, mp_obj_t *items);

47
py/objgenerator.c
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@ -15,7 +15,7 @@
typedef struct _mp_obj_gen_wrap_t {
mp_obj_base_t base;
int n_state;
uint n_state;
mp_obj_t *fun;
} mp_obj_gen_wrap_t;
@ -31,22 +31,8 @@ mp_obj_t gen_wrap_call_n(mp_obj_t self_in, int n_args, const mp_obj_t *args) {
if (n_args != bc_n_args) {
nlr_jump(mp_obj_new_exception_msg_2_args(rt_q_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));
}
mp_obj_t *state = m_new(mp_obj_t, 1 + self->n_state);
// put function object at first slot in state (to keep u_gen_instance small)
state[0] = self_fun;
// init args
for (int i = 0; i < n_args; i++) {
state[1 + i] = args[n_args - 1 - 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
assert(bc_code[0] == 0);
bc_code += 1;
return mp_obj_new_gen_instance(state, bc_code, state + self->n_state);
return mp_obj_new_gen_instance(bc_code, self->n_state, n_args, args);
}
const mp_obj_type_t gen_wrap_type = {
@ -75,9 +61,9 @@ mp_obj_t mp_obj_new_gen_wrap(uint n_locals, uint n_stack, mp_obj_t fun) {
typedef struct _mp_obj_gen_instance_t {
mp_obj_base_t base;
mp_obj_t *state;
const byte *ip;
mp_obj_t *sp;
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) {
@ -90,9 +76,7 @@ mp_obj_t gen_instance_getiter(mp_obj_t self_in) {
mp_obj_t gen_instance_iternext(mp_obj_t self_in) {
mp_obj_gen_instance_t *self = self_in;
//mp_obj_base_t *fun = self->u_gen_instance.state[0];
//assert(fun->kind == O_FUN_BC);
bool yield = mp_execute_byte_code_2(&self->ip, &self->state[1], &self->sp);
bool yield = mp_execute_byte_code_2(&self->ip, &self->state[0], &self->sp);
if (yield) {
return *self->sp;
} else {
@ -117,11 +101,24 @@ const mp_obj_type_t gen_instance_type = {
{{NULL, NULL},}, // method list
};
mp_obj_t mp_obj_new_gen_instance(mp_obj_t state, const byte *ip, mp_obj_t *sp) {
mp_obj_gen_instance_t *o = m_new_obj(mp_obj_gen_instance_t);
// args are in reverse order in the array
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->state = state;
o->ip = ip;
o->sp = sp;
o->ip = bytecode;
o->sp = o->state + n_state;
// copy args (which are in reverse order) to start of state array
for (int i = 0; i < n_args; i++) {
o->state[i] = args[n_args - 1 - 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
assert(o->ip[0] == 0);
o->ip += 1;
return o;
}

3
tests/basics/tests/generator2.py Normal file
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@ -0,0 +1,3 @@
gen = (i for i in range(10))
for i in gen:
print(i)