add shift/reset

This commit is contained in:
Yuichi Nishiwaki 2017-04-26 02:10:40 +09:00
parent 4618afec94
commit b1ebda613b
4 changed files with 203 additions and 149 deletions

View File

@ -8,17 +8,58 @@
#if PIC_USE_CALLCC #if PIC_USE_CALLCC
/*
* [(reset e)]k = k ([e] halt ())
* [(shift e)]k = [e] halt (\c x, c (k x))
*/
static pic_value
pic_cont_reset(pic_state *pic)
{
pic_value thunk;
pic_get_args(pic, "l", &thunk);
return pic_call(pic, thunk, 0);
}
static pic_value
shift_call(pic_state *pic)
{
pic_value x;
struct context cxt;
pic_get_args(pic, "o", &x);
CONTEXT_INIT(pic, &cxt, pic_closure_ref(pic, 0), 1, &x);
pic_vm(pic, &cxt);
return pic_protect(pic, cxt.fp->regs[1]);
}
static pic_value
pic_cont_shift(pic_state *pic)
{
pic_value f, k;
pic_get_args(pic, "l", &f);
k = pic_lambda(pic, shift_call, 1, pic->cxt->fp->regs[1]);
CONTEXT_INITK(pic, pic->cxt, f, pic->halt, 1, &k);
return pic_invalid_value(pic);
}
static pic_value static pic_value
cont_call(pic_state *pic) cont_call(pic_state *pic)
{ {
int argc; int argc;
pic_value *argv, k, dyn_env; pic_value *argv, k, dyn_env;
struct context *cxt, *c; struct context *cxt, *c;
int i;
pic_get_args(pic, "*", &argc, &argv); pic_get_args(pic, "*", &argc, &argv);
cxt = pic_data(pic, pic_closure_ref(pic, 0)); cxt = pic_data(pic, pic_closure_ref(pic, 0));
k = pic_closure_ref(pic, 1);
dyn_env = pic_closure_ref(pic, 2);
/* check if continuation is alive */ /* check if continuation is alive */
for (c = pic->cxt; c != NULL; c = c->prev) { for (c = pic->cxt; c != NULL; c = c->prev) {
@ -30,20 +71,9 @@ cont_call(pic_state *pic)
pic_error(pic, "calling dead escape continuation", 0); pic_error(pic, "calling dead escape continuation", 0);
} }
k = pic_closure_ref(pic, 1); CONTEXT_INIT(pic, cxt, k, argc, argv);
dyn_env = pic_closure_ref(pic, 2);
#define MKCALLK(argc) \
(cxt->tmpcode[0] = OP_CALL, cxt->tmpcode[1] = (argc), cxt->tmpcode)
cxt->pc = MKCALLK(argc);
cxt->sp = pic_make_frame_unsafe(pic, argc + 2);
cxt->sp->regs[0] = k;
for (i = 0; i < argc; ++i) {
cxt->sp->regs[i + 1] = argv[i];
}
pic->cxt = cxt; pic->cxt = cxt;
pic->dyn_env = dyn_env; pic->dyn_env = dyn_env;
longjmp(cxt->jmp, 1); longjmp(cxt->jmp, 1);
@ -60,12 +90,11 @@ pic_make_cont(pic_state *pic, pic_value k)
static pic_value static pic_value
pic_cont_callcc(pic_state *pic) pic_cont_callcc(pic_state *pic)
{ {
pic_value f, args[1]; pic_value f;
pic_get_args(pic, "l", &f); pic_get_args(pic, "l", &f);
args[0] = pic_make_cont(pic, pic->cxt->fp->regs[1]); return pic_callk(pic, f, 1, pic_make_cont(pic, pic->cxt->fp->regs[1]));
return pic_applyk(pic, f, 1, args);
} }
void void
@ -73,6 +102,8 @@ pic_init_cont(pic_state *pic)
{ {
pic_defun(pic, "call-with-current-continuation", pic_cont_callcc); pic_defun(pic, "call-with-current-continuation", pic_cont_callcc);
pic_defun(pic, "call/cc", pic_cont_callcc); pic_defun(pic, "call/cc", pic_cont_callcc);
pic_defun(pic, "shift", pic_cont_shift);
pic_defun(pic, "reset", pic_cont_reset);
} }
#endif /* PIC_USE_CALCC */ #endif /* PIC_USE_CALCC */

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@ -237,7 +237,9 @@ int pic_get_args(pic_state *, const char *fmt, ...);
pic_value pic_closure_ref(pic_state *, int i); pic_value pic_closure_ref(pic_state *, int i);
void pic_closure_set(pic_state *, int i, pic_value v); void pic_closure_set(pic_state *, int i, pic_value v);
pic_value pic_call(pic_state *, pic_value proc, int, ...); pic_value pic_call(pic_state *, pic_value proc, int, ...);
pic_value pic_callk(pic_state *, pic_value proc, int, ...);
pic_value pic_vcall(pic_state *, pic_value proc, int, va_list); pic_value pic_vcall(pic_state *, pic_value proc, int, va_list);
pic_value pic_vcallk(pic_state *, pic_value proc, int, va_list);
pic_value pic_apply(pic_state *, pic_value proc, int n, pic_value *argv); pic_value pic_apply(pic_state *, pic_value proc, int n, pic_value *argv);
pic_value pic_applyk(pic_state *, pic_value proc, int n, pic_value *argv); pic_value pic_applyk(pic_state *, pic_value proc, int n, pic_value *argv);

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@ -496,66 +496,102 @@ pic_call(pic_state *pic, pic_value proc, int n, ...)
return r; return r;
} }
pic_value
pic_callk(pic_state *pic, pic_value proc, int n, ...)
{
va_list ap;
va_start(ap, n);
pic_vcallk(pic, proc, n, ap);
va_end(ap);
return pic_invalid_value(pic);
}
pic_value pic_value
pic_vcall(pic_state *pic, pic_value proc, int n, va_list ap) pic_vcall(pic_state *pic, pic_value proc, int n, va_list ap)
{ {
size_t ai = pic_enter(pic); struct context cxt;
pic_value *args = pic_alloca(pic, sizeof(pic_value) * n); CONTEXT_VINITK(pic, &cxt, proc, pic->halt, n, ap);
pic_value r; pic_vm(pic, &cxt);
int i; return pic_protect(pic, cxt.fp->regs[1]);
}
for (i = 0; i < n; ++i) { pic_value
args[i] = va_arg(ap, pic_value); pic_vcallk(pic_state *pic, pic_value proc, int n, va_list ap)
} {
r = pic_apply(pic, proc, n, args); CONTEXT_VINITK(pic, pic->cxt, proc, GET_CONT(pic), n, ap);
pic_leave(pic, ai); return pic_invalid_value(pic);
return pic_protect(pic, r);
} }
pic_value pic_value
pic_apply(pic_state *pic, pic_value proc, int argc, pic_value *argv) pic_apply(pic_state *pic, pic_value proc, int argc, pic_value *argv)
{ {
struct context cxt; struct context cxt;
CONTEXT_INITK(pic, &cxt, proc, pic->halt, argc, argv);
pic_vm(pic, &cxt);
return pic_protect(pic, cxt.fp->regs[1]);
}
#define MKCALL(argc) (cxt.tmpcode[0] = OP_CALL, cxt.tmpcode[1] = (argc), cxt.tmpcode) pic_value
pic_applyk(pic_state *pic, pic_value proc, int argc, pic_value *argv)
{
CONTEXT_INITK(pic, pic->cxt, proc, GET_CONT(pic), argc, argv);
return pic_invalid_value(pic);
}
cxt.pc = MKCALL(argc + 1); pic_value
cxt.sp = pic_make_frame_unsafe(pic, argc + 3); pic_values(pic_state *pic, int n, ...)
cxt.sp->regs[0] = proc; {
cxt.sp->regs[1] = pic->halt; va_list ap;
if (argc != 0) { pic_value ret;
int i;
for (i = 0; i < argc; ++i) { va_start(ap, n);
cxt.sp->regs[i + 2] = argv[i]; ret = pic_vvalues(pic, n, ap);
va_end(ap);
return ret;
}
pic_value
pic_vvalues(pic_state *pic, int n, va_list ap)
{
if (n == 1) {
return va_arg(ap, pic_value);
} }
} CONTEXT_VINIT(pic, pic->cxt, GET_CONT(pic), n, ap);
cxt.fp = NULL; return pic_invalid_value(pic);
cxt.irep = NULL; }
cxt.prev = pic->cxt;
pic->cxt = &cxt;
#define SAVE (pic->ai = cxt.ai) void
pic_vm(pic_state *pic, struct context *cxt)
{
assert(cxt->fp == NULL);
assert(cxt->irep == NULL);
if (PIC_SETJMP(cxt.jmp) == 0) { cxt->prev = pic->cxt;
cxt.ai = pic->ai; pic->cxt = cxt;
if (PIC_SETJMP(cxt->jmp) == 0) {
cxt->ai = pic->ai;
} }
#define A (cxt.pc[1]) #define SAVE (pic->ai = cxt->ai)
#define B (cxt.pc[2])
#define C (cxt.pc[3]) #define A (cxt->pc[1])
#define B (cxt->pc[2])
#define C (cxt->pc[3])
#define Bx ((C << 8) + B) #define Bx ((C << 8) + B)
#define REG(i) (cxt.sp->regs[i]) #define REG(i) (cxt->sp->regs[i])
#if PIC_DIRECT_THREADED_VM #if PIC_DIRECT_THREADED_VM
# define VM_LOOP JUMP; # define VM_LOOP JUMP;
# define CASE(x) L_##x: # define CASE(x) L_##x:
# define NEXT(n) (cxt.pc += n); JUMP; # define NEXT(n) (cxt->pc += n); JUMP;
# define JUMP goto *oplabels[*cxt.pc]; # define JUMP goto *oplabels[*cxt->pc];
# define VM_LOOP_END # define VM_LOOP_END
#else #else
# define VM_LOOP for (;;) { switch (*cxt.pc) { # define VM_LOOP for (;;) { switch (*cxt->pc) {
# define CASE(x) case x: # define CASE(x) case x:
# define NEXT(n) (cxt.pc += n); break # define NEXT(n) (cxt->pc += n); break
# define JUMP break # define JUMP break
# define VM_LOOP_END } } # define VM_LOOP_END } }
#endif #endif
@ -572,10 +608,8 @@ pic_apply(pic_state *pic, pic_value proc, int argc, pic_value *argv)
VM_LOOP { VM_LOOP {
CASE(OP_HALT) { CASE(OP_HALT) {
pic_value ret = cxt.fp->regs[1];
pic->cxt = pic->cxt->prev; pic->cxt = pic->cxt->prev;
pic_protect(pic, ret); return;
return ret;
} }
CASE(OP_CALL) { CASE(OP_CALL) {
struct proc *proc; struct proc *proc;
@ -585,19 +619,19 @@ pic_apply(pic_state *pic, pic_value proc, int argc, pic_value *argv)
proc = proc_ptr(pic, REG(0)); proc = proc_ptr(pic, REG(0));
if (proc->tt == PIC_TYPE_PROC_FUNC) { if (proc->tt == PIC_TYPE_PROC_FUNC) {
pic_value v; pic_value v;
cxt.sp->up = proc->env; /* push static link */ cxt->sp->up = proc->env; /* push static link */
cxt.fp = cxt.sp; cxt->fp = cxt->sp;
cxt.sp = NULL; cxt->sp = NULL;
cxt.irep = NULL; cxt->irep = NULL;
v = proc->u.func(pic); v = proc->u.func(pic);
if (cxt.sp != NULL) { /* tail call */ if (cxt->sp != NULL) { /* tail call */
SAVE; SAVE;
JUMP; JUMP;
} else { } else {
cxt.sp = pic_make_frame_unsafe(pic, 3); cxt->sp = pic_make_frame_unsafe(pic, 3);
cxt.sp->regs[0] = cxt.fp->regs[1]; /* cont. */ cxt->sp->regs[0] = cxt->fp->regs[1]; /* cont. */
cxt.sp->regs[1] = v; cxt->sp->regs[1] = v;
cxt.pc = MKCALL(1); cxt->pc = MKCALL(cxt, 1);
SAVE; SAVE;
JUMP; JUMP;
} }
@ -614,34 +648,34 @@ pic_apply(pic_state *pic, pic_value proc, int argc, pic_value *argv)
SAVE; /* TODO: get rid of this */ SAVE; /* TODO: get rid of this */
} }
cxt.sp->up = proc->env; /* push static link */ cxt->sp->up = proc->env; /* push static link */
cxt.fp = cxt.sp; cxt->fp = cxt->sp;
cxt.sp = pic_make_frame_unsafe(pic, irep->frame_size); cxt->sp = pic_make_frame_unsafe(pic, irep->frame_size);
cxt.pc = irep->code; cxt->pc = irep->code;
cxt.irep = irep; cxt->irep = irep;
JUMP; JUMP;
} }
} }
CASE(OP_LREF) { CASE(OP_LREF) {
struct frame *f; struct frame *f;
int depth = B; int depth = B;
for (f = cxt.fp; depth--; f = f->up); for (f = cxt->fp; depth--; f = f->up);
REG(A) = f->regs[C]; REG(A) = f->regs[C];
NEXT(4); NEXT(4);
} }
CASE(OP_LSET) { CASE(OP_LSET) {
struct frame *f; struct frame *f;
int depth = B; int depth = B;
for (f = cxt.fp; depth--; f = f->up); for (f = cxt->fp; depth--; f = f->up);
f->regs[C] = REG(A); f->regs[C] = REG(A);
NEXT(4); NEXT(4);
} }
CASE(OP_GREF) { CASE(OP_GREF) {
REG(A) = pic_global_ref(pic, cxt.irep->obj[B]); REG(A) = pic_global_ref(pic, cxt->irep->obj[B]);
NEXT(3); NEXT(3);
} }
CASE(OP_GSET) { CASE(OP_GSET) {
pic_global_set(pic, cxt.irep->obj[B], REG(A)); pic_global_set(pic, cxt->irep->obj[B], REG(A));
NEXT(3); NEXT(3);
} }
CASE(OP_COND) { CASE(OP_COND) {
@ -652,11 +686,11 @@ pic_apply(pic_state *pic, pic_value proc, int argc, pic_value *argv)
} }
} }
CASE(OP_PROC) { CASE(OP_PROC) {
REG(A) = pic_make_proc_irep_unsafe(pic, cxt.irep->irep[B], cxt.fp); REG(A) = pic_make_proc_irep_unsafe(pic, cxt->irep->irep[B], cxt->fp);
NEXT(3); NEXT(3);
} }
CASE(OP_LOAD) { CASE(OP_LOAD) {
REG(A) = cxt.irep->obj[B]; REG(A) = cxt->irep->obj[B];
NEXT(3); NEXT(3);
} }
CASE(OP_LOADU) { CASE(OP_LOADU) {
@ -682,72 +716,6 @@ pic_apply(pic_state *pic, pic_value proc, int argc, pic_value *argv)
} VM_LOOP_END } VM_LOOP_END
} }
static pic_value
applyk(pic_state *pic, pic_value proc, pic_value cont, int argc, pic_value *argv)
{
int i;
#define MKCALLK(argc) \
(pic->cxt->tmpcode[0] = OP_CALL, pic->cxt->tmpcode[1] = (argc), pic->cxt->tmpcode)
pic->cxt->pc = MKCALLK(argc + 1);
pic->cxt->sp = pic_make_frame_unsafe(pic, argc + 3);
pic->cxt->sp->regs[0] = proc;
pic->cxt->sp->regs[1] = cont;
for (i = 0; i < argc; ++i) {
pic->cxt->sp->regs[i + 2] = argv[i];
}
return pic_invalid_value(pic);
}
pic_value
pic_applyk(pic_state *pic, pic_value proc, int argc, pic_value *args)
{
return applyk(pic, proc, GET_CONT(pic), argc, args);
}
static pic_value
valuesk(pic_state *pic, int argc, pic_value *argv)
{
int i;
pic->cxt->pc = MKCALLK(argc);
pic->cxt->sp = pic_make_frame_unsafe(pic, argc + 2);
pic->cxt->sp->regs[0] = pic->cxt->fp->regs[1];
for (i = 0; i < argc; ++i) {
pic->cxt->sp->regs[i + 1] = argv[i];
}
return pic_invalid_value(pic);
}
pic_value
pic_values(pic_state *pic, int n, ...)
{
va_list ap;
pic_value ret;
va_start(ap, n);
ret = pic_vvalues(pic, n, ap);
va_end(ap);
return ret;
}
pic_value
pic_vvalues(pic_state *pic, int n, va_list ap)
{
pic_value *retv;
int i;
if (n == 1) {
return va_arg(ap, pic_value);
}
retv = pic_alloca(pic, sizeof(pic_value) * n);
for (i = 0; i < n; ++i) {
retv[i] = va_arg(ap, pic_value);
}
return valuesk(pic, n, retv);
}
static pic_value static pic_value
pic_proc_make_procedure(pic_state *pic) pic_proc_make_procedure(pic_state *pic)
{ {
@ -811,34 +779,34 @@ pic_proc_values(pic_state *pic)
if (argc == 1) { if (argc == 1) {
return argv[0]; return argv[0];
} }
return valuesk(pic, argc, argv); CONTEXT_INIT(pic, pic->cxt, GET_CONT(pic), argc, argv);
return pic_invalid_value(pic);
} }
static pic_value static pic_value
receive_call(pic_state *pic) receive_call(pic_state *pic)
{ {
int argc = pic->cxt->pc[1]; int argc = pic->cxt->pc[1];
pic_value *args = &pic->cxt->fp->regs[1], consumer, cont; pic_value *args = &pic->cxt->fp->regs[1];
/* receive_call is an inhabitant in the continuation side. /* receive_call is an inhabitant in the continuation side.
You can not use pic_get_args since it implicitly consumes the first argument. */ You can not use pic_get_args since it implicitly consumes the first argument. */
consumer = pic_closure_ref(pic, 0); CONTEXT_INITK(pic, pic->cxt, pic_closure_ref(pic, 0), pic_closure_ref(pic, 1), argc, args);
cont = pic_closure_ref(pic, 1);
return applyk(pic, consumer, cont, argc, args); return pic_invalid_value(pic);
} }
static pic_value static pic_value
pic_proc_call_with_values(pic_state *pic) pic_proc_call_with_values(pic_state *pic)
{ {
pic_value producer, consumer, k; pic_value producer, consumer;
pic_get_args(pic, "ll", &producer, &consumer); pic_get_args(pic, "ll", &producer, &consumer);
k = pic_lambda(pic, receive_call, 2, consumer, pic->cxt->fp->regs[1]); CONTEXT_INITK(pic, pic->cxt, producer, pic_lambda(pic, receive_call, 2, consumer, GET_CONT(pic)), 0, (pic_value *) NULL);
return applyk(pic, producer, k, 0, NULL); return pic_invalid_value(pic);
} }
void void

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@ -58,7 +58,60 @@ void pic_heap_close(pic_state *, struct heap *);
pic_value pic_global_ref(pic_state *pic, pic_value uid); pic_value pic_global_ref(pic_state *pic, pic_value uid);
void pic_global_set(pic_state *pic, pic_value uid, pic_value value); void pic_global_set(pic_state *pic, pic_value uid, pic_value value);
void pic_vm_tear_off(pic_state *pic); #define MKCALL(cxt,argc) \
((cxt)->tmpcode[0] = OP_CALL, (cxt)->tmpcode[1] = (argc), (cxt)->tmpcode)
#define CONTEXT_VINITK(pic,cxt,proc,k,n,ap) do { \
int i; \
(cxt)->pc = MKCALL((cxt), (n) + 1); \
(cxt)->sp = pic_make_frame_unsafe(pic, (n) + 3); \
(cxt)->sp->regs[0] = (proc); \
(cxt)->sp->regs[1] = k; \
for (i = 0; i < (n); ++i) { \
(cxt)->sp->regs[i + 2] = va_arg(ap, pic_value); \
} \
(cxt)->fp = NULL; \
(cxt)->irep = NULL; \
} while (0)
#define CONTEXT_INITK(pic,cxt,proc,k,n,argv) do { \
int i; \
(cxt)->pc = MKCALL((cxt), (n) + 1); \
(cxt)->sp = pic_make_frame_unsafe(pic, (n) + 3); \
(cxt)->sp->regs[0] = (proc); \
(cxt)->sp->regs[1] = k; \
for (i = 0; i < (n); ++i) { \
(cxt)->sp->regs[i + 2] = (argv)[i]; \
} \
(cxt)->fp = NULL; \
(cxt)->irep = NULL; \
} while (0)
#define CONTEXT_VINIT(pic,cxt,proc,n,ap) do { \
int i; \
(cxt)->pc = MKCALL((cxt), (n)); \
(cxt)->sp = pic_make_frame_unsafe(pic, (n) + 2); \
(cxt)->sp->regs[0] = (proc); \
for (i = 0; i < (n); ++i) { \
(cxt)->sp->regs[i + 1] = va_arg(ap, pic_value); \
} \
(cxt)->fp = NULL; \
(cxt)->irep = NULL; \
} while (0)
#define CONTEXT_INIT(pic,cxt,proc,n,argv) do { \
int i; \
(cxt)->pc = MKCALL((cxt), (n)); \
(cxt)->sp = pic_make_frame_unsafe(pic, (n) + 2); \
(cxt)->sp->regs[0] = (proc); \
for (i = 0; i < (n); ++i) { \
(cxt)->sp->regs[i + 1] = (argv)[i]; \
} \
(cxt)->fp = NULL; \
(cxt)->irep = NULL; \
} while (0)
void pic_vm(pic_state *pic, struct context *cxt);
#if defined(__cplusplus) #if defined(__cplusplus)
} }