picrin/contrib/10.callcc/callcc.c

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C
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#include "picrin.h"
struct pic_fullcont {
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jmp_buf jmp;
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struct pic_cont *prev_jmp;
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pic_checkpoint *cp;
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char *stk_pos, *stk_ptr;
ptrdiff_t stk_len;
pic_value *st_ptr;
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size_t sp_offset;
ptrdiff_t st_len;
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pic_callinfo *ci_ptr;
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size_t ci_offset;
ptrdiff_t ci_len;
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struct pic_proc **xp_ptr;
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size_t xp_offset;
ptrdiff_t xp_len;
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pic_code *ip;
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pic_value ptable;
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struct pic_object **arena;
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size_t arena_size, arena_idx;
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pic_value results;
};
static void
cont_dtor(pic_state *pic, void *data)
{
struct pic_fullcont *cont = data;
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pic_free(pic, cont->stk_ptr);
pic_free(pic, cont->st_ptr);
pic_free(pic, cont->ci_ptr);
pic_free(pic, cont->xp_ptr);
pic_free(pic, cont->arena);
pic_free(pic, cont);
}
static void
cont_mark(pic_state *pic, void *data, void (*mark)(pic_state *, pic_value))
{
struct pic_fullcont *cont = data;
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pic_checkpoint *cp;
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pic_value *stack;
pic_callinfo *ci;
struct pic_proc **xp;
size_t i;
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/* checkpoint */
for (cp = cont->cp; cp != NULL; cp = cp->prev) {
if (cp->in) {
mark(pic, pic_obj_value(cp->in));
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}
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if (cp->out) {
mark(pic, pic_obj_value(cp->out));
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}
}
/* stack */
for (stack = cont->st_ptr; stack != cont->st_ptr + cont->sp_offset; ++stack) {
mark(pic, *stack);
}
/* callinfo */
for (ci = cont->ci_ptr + cont->ci_offset; ci != cont->ci_ptr; --ci) {
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if (ci->cxt) {
mark(pic, pic_obj_value(ci->cxt));
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}
}
/* exception handlers */
for (xp = cont->xp_ptr; xp != cont->xp_ptr + cont->xp_offset; ++xp) {
mark(pic, pic_obj_value(*xp));
}
/* arena */
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for (i = 0; i < cont->arena_idx; ++i) {
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mark(pic, pic_obj_value(cont->arena[i]));
}
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/* parameter table */
mark(pic, cont->ptable);
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/* result values */
mark(pic, cont->results);
}
static const pic_data_type cont_type = { "continuation", cont_dtor, cont_mark };
static void save_cont(pic_state *, struct pic_fullcont **);
static void restore_cont(pic_state *, struct pic_fullcont *);
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static ptrdiff_t
native_stack_length(pic_state *pic, char **pos)
{
char t;
*pos = (pic->native_stack_start > &t)
? &t
: pic->native_stack_start;
return (pic->native_stack_start > &t)
? pic->native_stack_start - &t
: &t - pic->native_stack_start;
}
static void
save_cont(pic_state *pic, struct pic_fullcont **c)
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{
void pic_vm_tear_off(pic_state *);
struct pic_fullcont *cont;
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char *pos;
pic_vm_tear_off(pic); /* tear off */
cont = *c = pic_malloc(pic, sizeof(struct pic_fullcont));
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cont->prev_jmp = pic->cc;
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cont->cp = pic->cp;
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cont->stk_len = native_stack_length(pic, &pos);
cont->stk_pos = pos;
assert(cont->stk_len > 0);
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cont->stk_ptr = pic_malloc(pic, cont->stk_len);
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memcpy(cont->stk_ptr, cont->stk_pos, cont->stk_len);
cont->sp_offset = pic->sp - pic->stbase;
cont->st_len = pic->stend - pic->stbase;
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cont->st_ptr = pic_malloc(pic, sizeof(pic_value) * cont->st_len);
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memcpy(cont->st_ptr, pic->stbase, sizeof(pic_value) * cont->st_len);
cont->ci_offset = pic->ci - pic->cibase;
cont->ci_len = pic->ciend - pic->cibase;
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cont->ci_ptr = pic_malloc(pic, sizeof(pic_callinfo) * cont->ci_len);
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memcpy(cont->ci_ptr, pic->cibase, sizeof(pic_callinfo) * cont->ci_len);
cont->xp_offset = pic->xp - pic->xpbase;
cont->xp_len = pic->xpend - pic->xpbase;
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cont->xp_ptr = pic_malloc(pic, sizeof(struct pic_proc *) * cont->xp_len);
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memcpy(cont->xp_ptr, pic->xpbase, sizeof(struct pic_proc *) * cont->xp_len);
cont->ip = pic->ip;
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cont->ptable = pic->ptable;
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cont->arena_idx = pic->arena_idx;
cont->arena_size = pic->arena_size;
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cont->arena = pic_malloc(pic, sizeof(struct pic_object *) * pic->arena_size);
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memcpy(cont->arena, pic->arena, sizeof(struct pic_object *) * pic->arena_size);
cont->results = pic_undef_value();
}
static void
native_stack_extend(pic_state *pic, struct pic_fullcont *cont)
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{
volatile pic_value v[1024];
((void)v);
restore_cont(pic, cont);
}
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PIC_NORETURN static void
restore_cont(pic_state *pic, struct pic_fullcont *cont)
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{
char v;
struct pic_fullcont *tmp = cont;
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if (&v < pic->native_stack_start) {
if (&v > cont->stk_pos) native_stack_extend(pic, cont);
}
else {
if (&v < cont->stk_pos + cont->stk_len) native_stack_extend(pic, cont);
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}
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pic->cc = cont->prev_jmp;
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pic->cp = cont->cp;
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assert(pic->stend - pic->stbase >= cont->st_len);
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memcpy(pic->stbase, cont->st_ptr, sizeof(pic_value) * cont->st_len);
pic->sp = pic->stbase + cont->sp_offset;
pic->stend = pic->stbase + cont->st_len;
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assert(pic->ciend - pic->cibase >= cont->ci_len);
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memcpy(pic->cibase, cont->ci_ptr, sizeof(pic_callinfo) * cont->ci_len);
pic->ci = pic->cibase + cont->ci_offset;
pic->ciend = pic->cibase + cont->ci_len;
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assert(pic->xpend - pic->xpbase >= cont->xp_len);
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memcpy(pic->xpbase, cont->xp_ptr, sizeof(struct pic_proc *) * cont->xp_len);
pic->xp = pic->xpbase + cont->xp_offset;
pic->xpend = pic->xpbase + cont->xp_len;
pic->ip = cont->ip;
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pic->ptable = cont->ptable;
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assert(pic->arena_size >= cont->arena_size);
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memcpy(pic->arena, cont->arena, sizeof(struct pic_object *) * cont->arena_size);
pic->arena_size = cont->arena_size;
pic->arena_idx = cont->arena_idx;
memcpy(cont->stk_pos, cont->stk_ptr, cont->stk_len);
longjmp(tmp->jmp, 1);
}
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PIC_NORETURN static pic_value
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cont_call(pic_state *pic)
{
struct pic_proc *self;
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int argc;
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pic_value *argv;
struct pic_fullcont *cont;
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pic_get_args(pic, "&*", &self, &argc, &argv);
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cont = pic_data_ptr(pic_proc_env_ref(pic, self, "cont"))->data;
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cont->results = pic_list_by_array(pic, argc, argv);
/* execute guard handlers */
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pic_wind(pic, pic->cp, cont->cp);
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restore_cont(pic, cont);
}
pic_value
pic_callcc_full(pic_state *pic, struct pic_proc *proc)
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{
struct pic_fullcont *cont;
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save_cont(pic, &cont);
if (setjmp(cont->jmp)) {
return pic_values_by_list(pic, cont->results);
}
else {
struct pic_proc *c;
struct pic_data *dat;
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c = pic_make_proc(pic, cont_call);
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dat = pic_data_alloc(pic, &cont_type, cont);
/* save the continuation object in proc */
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pic_proc_env_set(pic, c, "cont", pic_obj_value(dat));
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return pic_apply1(pic, proc, pic_obj_value(c));
}
}
static pic_value
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pic_callcc_callcc(pic_state *pic)
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{
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struct pic_proc *proc;
struct pic_fullcont *cont;
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pic_get_args(pic, "l", &proc);
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save_cont(pic, &cont);
if (setjmp(cont->jmp)) {
return pic_values_by_list(pic, cont->results);
}
else {
struct pic_proc *c;
struct pic_data *dat;
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c = pic_make_proc(pic, cont_call);
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dat = pic_data_alloc(pic, &cont_type, cont);
/* save the continuation object in proc */
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pic_proc_env_set(pic, c, "cont", pic_obj_value(dat));
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return pic_apply_trampoline_list(pic, proc, pic_list1(pic, pic_obj_value(c)));
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}
}
#define pic_redefun(pic, lib, name, func) \
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pic_set(pic, lib, name, pic_obj_value(pic_make_proc(pic, func)))
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void
pic_init_callcc(pic_state *pic)
{
pic_deflibrary (pic, "(scheme base)") {
pic_redefun(pic, pic->PICRIN_BASE, "call-with-current-continuation", pic_callcc_callcc);
pic_redefun(pic, pic->PICRIN_BASE, "call/cc", pic_callcc_callcc);
}
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}