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picrin/vm.c

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/**
* See Copyright Notice in picrin.h
*/
#include <stdlib.h>
#include <stdarg.h>
#include <limits.h>
#include <math.h>
#include "picrin.h"
#include "picrin/pair.h"
#include "picrin/string.h"
#include "picrin/vector.h"
#include "picrin/proc.h"
#include "picrin/port.h"
#include "picrin/irep.h"
#include "picrin/blob.h"
#include "picrin/lib.h"
#include "picrin/macro.h"
#include "picrin/error.h"
#include "picrin/dict.h"
#include "picrin/record.h"
#define GET_OPERAND(pic,n) ((pic)->ci->fp[(n)])
struct pic_proc *
pic_get_proc(pic_state *pic)
{
pic_value v = GET_OPERAND(pic,0);
if (! pic_proc_p(v)) {
pic_errorf(pic, "fatal error");
}
return pic_proc_ptr(v);
}
/**
* char type desc.
* ---- ---- ----
* o pic_value * object
* i int * int
* I int *, bool * int with exactness
* k size_t * size_t implicitly converted from int
* f double * float
* F double *, bool * float with exactness
* s pic_str ** string object
* z char ** c string
* m pic_sym * symbol
* v pic_vec ** vector object
* b pic_blob ** bytevector object
* c char * char
* l struct pic_proc ** lambda object
* p struct pic_port ** port object
* d struct pic_dict ** dictionary object
* e struct pic_error ** error object
*
* | optional operator
* * size_t *, pic_value ** variable length operator
*/
int
pic_get_args(pic_state *pic, const char *format, ...)
{
char c;
int i = 1, argc = pic->ci->argc;
va_list ap;
bool opt = false;
va_start(ap, format);
while ((c = *format++)) {
switch (c) {
default:
if (argc <= i && ! opt) {
pic_errorf(pic, "wrong number of arguments");
}
break;
case '|':
break;
case '*':
break;
}
/* in order to run out of all arguments passed to this function
(i.e. do va_arg for each argument), optional argument existence
check is done in every case closure */
if (c == '*')
break;
switch (c) {
case '|':
opt = true;
break;
case 'o': {
pic_value *p;
p = va_arg(ap, pic_value*);
if (i < argc) {
*p = GET_OPERAND(pic,i);
i++;
}
break;
}
case 'f': {
double *f;
f = va_arg(ap, double *);
if (i < argc) {
pic_value v;
v = GET_OPERAND(pic, i);
switch (pic_type(v)) {
case PIC_TT_FLOAT:
*f = pic_float(v);
break;
case PIC_TT_INT:
*f = pic_int(v);
break;
default:
pic_errorf(pic, "pic_get_args: expected float or int, but got ~s", v);
}
i++;
}
break;
}
case 'F': {
double *f;
bool *e;
f = va_arg(ap, double *);
e = va_arg(ap, bool *);
if (i < argc) {
pic_value v;
v = GET_OPERAND(pic, i);
switch (pic_type(v)) {
case PIC_TT_FLOAT:
*f = pic_float(v);
*e = false;
break;
case PIC_TT_INT:
*f = pic_int(v);
*e = true;
break;
default:
pic_errorf(pic, "pic_get_args: expected float or int, but got ~s", v);
}
i++;
}
break;
}
case 'I': {
int *k;
bool *e;
k = va_arg(ap, int *);
e = va_arg(ap, bool *);
if (i < argc) {
pic_value v;
v = GET_OPERAND(pic, i);
switch (pic_type(v)) {
case PIC_TT_FLOAT:
*k = (int)pic_float(v);
*e = false;
break;
case PIC_TT_INT:
*k = pic_int(v);
*e = true;
break;
default:
pic_errorf(pic, "pic_get_args: expected float or int, but got ~s", v);
}
i++;
}
break;
}
case 'i': {
int *k;
k = va_arg(ap, int *);
if (i < argc) {
pic_value v;
v = GET_OPERAND(pic, i);
switch (pic_type(v)) {
case PIC_TT_FLOAT:
*k = (int)pic_float(v);
break;
case PIC_TT_INT:
*k = pic_int(v);
break;
default:
pic_errorf(pic, "pic_get_args: expected int, but got ~s", v);
}
i++;
}
break;
}
case 'k': {
size_t *k;
k = va_arg(ap, size_t *);
if (i < argc) {
pic_value v;
int x;
v = GET_OPERAND(pic, i);
switch (pic_type(v)) {
case PIC_TT_INT:
x = pic_int(v);
if (x < 0) {
pic_errorf(pic, "pic_get_args: expected non-negative int, but got ~s", v);
}
if (sizeof(unsigned) > sizeof(size_t)) {
if ((unsigned)x > (unsigned)SIZE_MAX) {
pic_errorf(pic, "pic_get_args: int unrepresentable with size_t ~s", v);
}
}
*k = (size_t)x;
break;
default:
pic_errorf(pic, "pic_get_args: expected int, but got ~s", v);
}
i++;
}
break;
}
case 's': {
pic_str **str;
pic_value v;
str = va_arg(ap, pic_str **);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_str_p(v)) {
*str = pic_str_ptr(v);
}
else {
pic_errorf(pic, "pic_get_args: expected string, but got ~s", v);
}
i++;
}
break;
}
case 'z': {
const char **cstr;
pic_value v;
cstr = va_arg(ap, const char **);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (! pic_str_p(v)) {
pic_errorf(pic, "pic_get_args: expected string, but got ~s", v);
}
*cstr = pic_str_cstr(pic_str_ptr(v));
i++;
}
break;
}
case 'm': {
pic_sym *m;
pic_value v;
m = va_arg(ap, pic_sym *);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_sym_p(v)) {
*m = pic_sym(v);
}
else {
pic_errorf(pic, "pic_get_args: expected symbol, but got ~s", v);
}
i++;
}
break;
}
case 'v': {
struct pic_vector **vec;
pic_value v;
vec = va_arg(ap, struct pic_vector **);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_vec_p(v)) {
*vec = pic_vec_ptr(v);
}
else {
pic_errorf(pic, "pic_get_args: expected vector, but got ~s", v);
}
i++;
}
break;
}
case 'b': {
struct pic_blob **b;
pic_value v;
b = va_arg(ap, struct pic_blob **);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_blob_p(v)) {
*b = pic_blob_ptr(v);
}
else {
pic_errorf(pic, "pic_get_args: expected bytevector, but got ~s", v);
}
i++;
}
break;
}
case 'c': {
char *k;
pic_value v;
k = va_arg(ap, char *);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_char_p(v)) {
*k = pic_char(v);
}
else {
pic_errorf(pic, "pic_get_args: expected char, but got ~s", v);
}
i++;
}
break;
}
case 'l': {
struct pic_proc **l;
pic_value v;
l = va_arg(ap, struct pic_proc **);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_proc_p(v)) {
*l = pic_proc_ptr(v);
}
else {
pic_errorf(pic, "pic_get_args, expected procedure, but got ~s", v);
}
i++;
}
break;
}
case 'p': {
struct pic_port **p;
pic_value v;
p = va_arg(ap, struct pic_port **);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_port_p(v)) {
*p = pic_port_ptr(v);
}
else {
pic_errorf(pic, "pic_get_args, expected port, but got ~s", v);
}
i++;
}
break;
}
case 'd': {
struct pic_dict **d;
pic_value v;
d = va_arg(ap, struct pic_dict **);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_dict_p(v)) {
*d = pic_dict_ptr(v);
}
else {
pic_errorf(pic, "pic_get_args, expected dictionary, but got ~s", v);
}
i++;
}
break;
}
case 'r': {
struct pic_record **r;
pic_value v;
r = va_arg(ap, struct pic_record **);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_record_p(v)) {
*r = pic_record_ptr(v);
}
else {
pic_errorf(pic, "pic_get_args: expected record, but got ~s", v);
}
i++;
}
break;
}
case 'e': {
struct pic_error **e;
pic_value v;
e = va_arg(ap, struct pic_error **);
if (i < argc) {
v = GET_OPERAND(pic,i);
if (pic_error_p(v)) {
*e = pic_error_ptr(v);
}
else {
pic_errorf(pic, "pic_get_args, expected error");
}
i++;
}
break;
}
default:
pic_errorf(pic, "pic_get_args: invalid argument specifier '%c' given", c);
}
}
if ('*' == c) {
size_t *n;
pic_value **argv;
n = va_arg(ap, size_t *);
argv = va_arg(ap, pic_value **);
if (i <= argc) {
*n = (size_t)(argc - i);
*argv = &GET_OPERAND(pic, i);
i = argc;
}
}
else if (argc > i) {
pic_errorf(pic, "wrong number of arguments");
}
va_end(ap);
return i - 1;
}
void
pic_define_noexport(pic_state *pic, const char *name, pic_value val)
{
pic_sym sym, rename;
sym = pic_intern_cstr(pic, name);
if (! pic_find_rename(pic, pic->lib->env, sym, &rename)) {
rename = pic_add_rename(pic, pic->lib->env, sym);
} else {
pic_warn(pic, "redefining global");
}
xh_put_int(&pic->globals, rename, &val);
}
void
pic_define(pic_state *pic, const char *name, pic_value val)
{
pic_define_noexport(pic, name, val);
pic_export(pic, pic_intern_cstr(pic, name));
}
pic_value
pic_ref(pic_state *pic, struct pic_lib *lib, const char *name)
{
pic_sym sym, rename;
sym = pic_intern_cstr(pic, name);
if (! pic_find_rename(pic, lib->env, sym, &rename)) {
pic_errorf(pic, "symbol \"%s\" not defined in library ~s", name, lib->name);
}
return xh_val(xh_get_int(&pic->globals, rename), pic_value);
}
void
pic_set(pic_state *pic, struct pic_lib *lib, const char *name, pic_value val)
{
pic_sym sym, rename;
sym = pic_intern_cstr(pic, name);
if (! pic_find_rename(pic, lib->env, sym, &rename)) {
pic_errorf(pic, "symbol \"%s\" not defined in library ~s", name, lib->name);
}
xh_put_int(&pic->globals, rename, &val);
}
pic_value
pic_funcall(pic_state *pic, struct pic_lib *lib, const char *name, pic_list args)
{
pic_value proc;
proc = pic_ref(pic, lib, name);
pic_assert_type(pic, proc, proc);
return pic_apply(pic, pic_proc_ptr(proc), args);
}
void
pic_defun(pic_state *pic, const char *name, pic_func_t cfunc)
{
struct pic_proc *proc;
proc = pic_make_proc(pic, cfunc, name);
pic_define(pic, name, pic_obj_value(proc));
}
void
pic_defvar(pic_state *pic, const char *name, pic_value init, struct pic_proc *conv)
{
pic_define(pic, name, pic_obj_value(pic_make_var(pic, init, conv)));
}
static void
vm_push_env(pic_state *pic)
{
pic_callinfo *ci = pic->ci;
ci->env = (struct pic_env *)pic_obj_alloc(pic, offsetof(struct pic_env, storage) + sizeof(pic_value) * (size_t)(ci->regc), PIC_TT_ENV);
ci->env->up = ci->up;
ci->env->regc = ci->regc;
ci->env->regs = ci->regs;
}
static void
vm_tear_off(pic_callinfo *ci)
{
struct pic_env *env;
int i;
assert(ci->env != NULL);
env = ci->env;
if (env->regs == env->storage) {
return; /* is torn off */
}
for (i = 0; i < env->regc; ++i) {
env->storage[i] = env->regs[i];
}
env->regs = env->storage;
}
void
pic_vm_tear_off(pic_state *pic)
{
pic_callinfo *ci;
for (ci = pic->ci; ci > pic->cibase; ci--) {
if (ci->env != NULL) {
vm_tear_off(ci);
}
}
}
pic_value
pic_apply0(pic_state *pic, struct pic_proc *proc)
{
return pic_apply(pic, proc, pic_nil_value());
}
pic_value
pic_apply1(pic_state *pic, struct pic_proc *proc, pic_value arg1)
{
return pic_apply(pic, proc, pic_list1(pic, arg1));
}
pic_value
pic_apply2(pic_state *pic, struct pic_proc *proc, pic_value arg1, pic_value arg2)
{
return pic_apply(pic, proc, pic_list2(pic, arg1, arg2));
}
pic_value
pic_apply3(pic_state *pic, struct pic_proc *proc, pic_value arg1, pic_value arg2, pic_value arg3)
{
return pic_apply(pic, proc, pic_list3(pic, arg1, arg2, arg3));
}
pic_value
pic_apply4(pic_state *pic, struct pic_proc *proc, pic_value arg1, pic_value arg2, pic_value arg3, pic_value arg4)
{
return pic_apply(pic, proc, pic_list4(pic, arg1, arg2, arg3, arg4));
}
pic_value
pic_apply5(pic_state *pic, struct pic_proc *proc, pic_value arg1, pic_value arg2, pic_value arg3, pic_value arg4, pic_value arg5)
{
return pic_apply(pic, proc, pic_list5(pic, arg1, arg2, arg3, arg4, arg5));
}
#if VM_DEBUG
# define OPCODE_EXEC_HOOK pic_dump_code(c)
#else
# define OPCODE_EXEC_HOOK ((void)0)
#endif
#if PIC_DIRECT_THREADED_VM
# define VM_LOOP JUMP;
# define CASE(x) L_##x: OPCODE_EXEC_HOOK;
# define NEXT pic->ip++; JUMP;
# define JUMP c = *pic->ip; goto *oplabels[c.insn];
# define VM_LOOP_END
#else
# define VM_LOOP for (;;) { c = *pic->ip; switch (c.insn) {
# define CASE(x) case x:
# define NEXT pic->ip++; break
# define JUMP break
# define VM_LOOP_END } }
#endif
#define PUSH(v) (*pic->sp++ = (v))
#define POP() (*--pic->sp)
#define PUSHCI() (++pic->ci)
#define POPCI() (pic->ci--)
#if VM_DEBUG
# define VM_BOOT_PRINT \
do { \
puts("### booting VM... ###"); \
stbase = pic->sp; \
cibase = pic->ci; \
} while (0)
#else
# define VM_BOOT_PRINT
#endif
#if VM_DEBUG
# define VM_END_PRINT \
do { \
puts("**VM END STATE**"); \
printf("stbase\t= %p\nsp\t= %p\n", (void *)stbase, (void *)pic->sp); \
printf("cibase\t= %p\nci\t= %p\n", (void *)cibase, (void *)pic->ci); \
if (stbase < pic->sp - 1) { \
pic_value *sp; \
printf("* stack trace:"); \
for (sp = stbase; pic->sp != sp; ++sp) { \
pic_debug(pic, *sp); \
puts(""); \
} \
} \
if (stbase > pic->sp - 1) { \
puts("*** stack underflow!"); \
} \
} while (0)
#else
# define VM_END_PRINT
#endif
#if VM_DEBUG
# define VM_CALL_PRINT \
do { \
puts("\n== calling proc..."); \
printf(" proc = "); \
pic_debug(pic, pic_obj_value(proc)); \
puts(""); \
printf(" argv = ("); \
for (short i = 1; i < c.u.i; ++i) { \
if (i > 1) \
printf(" "); \
pic_debug(pic, pic->sp[-c.u.i + i]); \
} \
puts(")"); \
if (! pic_proc_func_p(proc)) { \
printf(" irep = %p\n", proc->u.irep); \
printf(" name = %s\n", pic_symbol_name(pic, pic_proc_name(proc))); \
pic_dump_irep(proc->u.irep); \
} \
else { \
printf(" cfunc = %p\n", (void *)proc->u.func.f); \
printf(" name = %s\n", pic_symbol_name(pic, pic_proc_name(proc))); \
} \
puts("== end\n"); \
} while (0)
#else
# define VM_CALL_PRINT
#endif
pic_value
pic_apply(pic_state *pic, struct pic_proc *proc, pic_value args)
{
pic_code c;
size_t ai = pic_gc_arena_preserve(pic);
pic_code boot[2];
#if PIC_DIRECT_THREADED_VM
static void *oplabels[] = {
&&L_OP_NOP, &&L_OP_POP, &&L_OP_PUSHNIL, &&L_OP_PUSHTRUE, &&L_OP_PUSHFALSE,
&&L_OP_PUSHINT, &&L_OP_PUSHCHAR, &&L_OP_PUSHCONST,
&&L_OP_GREF, &&L_OP_GSET, &&L_OP_LREF, &&L_OP_LSET, &&L_OP_CREF, &&L_OP_CSET,
&&L_OP_JMP, &&L_OP_JMPIF, &&L_OP_NOT, &&L_OP_CALL, &&L_OP_TAILCALL, &&L_OP_RET,
&&L_OP_LAMBDA, &&L_OP_CONS, &&L_OP_CAR, &&L_OP_CDR, &&L_OP_NILP,
&&L_OP_ADD, &&L_OP_SUB, &&L_OP_MUL, &&L_OP_DIV, &&L_OP_MINUS,
&&L_OP_EQ, &&L_OP_LT, &&L_OP_LE, &&L_OP_STOP
};
#endif
#if VM_DEBUG
pic_value *stbase;
pic_callinfo *cibase;
#endif
if (! pic_list_p(args)) {
pic_errorf(pic, "argv must be a proper list");
}
else {
int argc, i;
argc = (int)pic_length(pic, args) + 1;
VM_BOOT_PRINT;
PUSH(pic_obj_value(proc));
for (i = 1; i < argc; ++i) {
PUSH(pic_car(pic, args));
args = pic_cdr(pic, args);
}
/* boot! */
boot[0].insn = OP_CALL;
boot[0].u.i = argc;
boot[1].insn = OP_STOP;
pic->ip = boot;
}
VM_LOOP {
CASE(OP_NOP) {
NEXT;
}
CASE(OP_POP) {
(void)(POP());
NEXT;
}
CASE(OP_PUSHNIL) {
PUSH(pic_nil_value());
NEXT;
}
CASE(OP_PUSHTRUE) {
PUSH(pic_true_value());
NEXT;
}
CASE(OP_PUSHFALSE) {
PUSH(pic_false_value());
NEXT;
}
CASE(OP_PUSHINT) {
PUSH(pic_int_value(c.u.i));
NEXT;
}
CASE(OP_PUSHCHAR) {
PUSH(pic_char_value(c.u.c));
NEXT;
}
CASE(OP_PUSHCONST) {
pic_value self;
struct pic_irep *irep;
self = pic->ci->fp[0];
if (! pic_proc_p(self)) {
pic_errorf(pic, "logic flaw");
}
irep = pic_proc_ptr(self)->u.irep;
if (! pic_proc_irep_p(pic_proc_ptr(self))) {
pic_errorf(pic, "logic flaw");
}
PUSH(irep->pool[c.u.i]);
NEXT;
}
CASE(OP_GREF) {
xh_entry *e;
if ((e = xh_get_int(&pic->globals, c.u.i)) == NULL) {
pic_errorf(pic, "logic flaw; reference to uninitialized global variable: %s", pic_symbol_name(pic, c.u.i));
}
PUSH(xh_val(e, pic_value));
NEXT;
}
CASE(OP_GSET) {
pic_value val;
val = POP();
xh_put_int(&pic->globals, c.u.i, &val);
NEXT;
}
CASE(OP_LREF) {
pic_callinfo *ci = pic->ci;
struct pic_irep *irep;
if (ci->env != NULL && ci->env->regs == ci->env->storage) {
irep = pic_get_proc(pic)->u.irep;
if (c.u.i >= irep->argc + irep->localc) {
PUSH(ci->env->regs[c.u.i - (ci->regs - ci->fp)]);
NEXT;
}
}
PUSH(pic->ci->fp[c.u.i]);
NEXT;
}
CASE(OP_LSET) {
pic_callinfo *ci = pic->ci;
struct pic_irep *irep;
if (ci->env != NULL && ci->env->regs == ci->env->storage) {
irep = pic_get_proc(pic)->u.irep;
if (c.u.i >= irep->argc + irep->localc) {
ci->env->regs[c.u.i - (ci->regs - ci->fp)] = POP();
NEXT;
}
}
pic->ci->fp[c.u.i] = POP();
NEXT;
}
CASE(OP_CREF) {
int depth = c.u.r.depth;
struct pic_env *env;
env = pic->ci->up;
while (--depth) {
env = env->up;
}
PUSH(env->regs[c.u.r.idx]);
NEXT;
}
CASE(OP_CSET) {
int depth = c.u.r.depth;
struct pic_env *env;
env = pic->ci->up;
while (--depth) {
env = env->up;
}
env->regs[c.u.r.idx] = POP();
NEXT;
}
CASE(OP_JMP) {
pic->ip += c.u.i;
JUMP;
}
CASE(OP_JMPIF) {
pic_value v;
v = POP();
if (! pic_false_p(v)) {
pic->ip += c.u.i;
JUMP;
}
NEXT;
}
CASE(OP_NOT) {
pic_value v;
v = pic_false_p(POP()) ? pic_true_value() : pic_false_value();
PUSH(v);
NEXT;
}
CASE(OP_CALL) {
pic_value x, v;
pic_callinfo *ci;
if (c.u.i == -1) {
pic->sp += pic->ci[1].retc - 1;
c.u.i = pic->ci[1].retc + 1;
}
L_CALL:
x = pic->sp[-c.u.i];
if (! pic_proc_p(x)) {
pic_errorf(pic, "invalid application: ~s", x);
}
proc = pic_proc_ptr(x);
VM_CALL_PRINT;
if (pic->sp >= pic->stend) {
pic_panic(pic, "VM stack overflow");
}
ci = PUSHCI();
ci->argc = c.u.i;
ci->retc = 1;
ci->ip = pic->ip;
ci->fp = pic->sp - c.u.i;
ci->env = NULL;
if (pic_proc_func_p(pic_proc_ptr(x))) {
/* invoke! */
v = proc->u.func.f(pic);
pic->sp[0] = v;
pic->sp += pic->ci->retc;
pic_gc_arena_restore(pic, ai);
goto L_RET;
}
else {
struct pic_irep *irep = proc->u.irep;
int i;
pic_value rest;
if (ci->argc != irep->argc) {
if (! (irep->varg && ci->argc >= irep->argc)) {
pic_errorf(pic, "wrong number of arguments (%d for %d%s)", ci->argc - 1, irep->argc - 1, (irep->varg ? "+" : ""));
}
}
/* prepare rest args */
if (irep->varg) {
rest = pic_nil_value();
for (i = 0; i < ci->argc - irep->argc; ++i) {
pic_gc_protect(pic, v = POP());
rest = pic_cons(pic, v, rest);
}
PUSH(rest);
}
/* prepare local variable area */
if (irep->localc > 0) {
int l = irep->localc;
if (irep->varg) {
--l;
}
for (i = 0; i < l; ++i) {
PUSH(pic_undef_value());
}
}
/* prepare env */
ci->up = proc->env;
ci->regc = irep->capturec;
ci->regs = ci->fp + irep->argc + irep->localc;
pic->ip = irep->code;
pic_gc_arena_restore(pic, ai);
JUMP;
}
}
CASE(OP_TAILCALL) {
int i, argc;
pic_value *argv;
pic_callinfo *ci;
if (pic->ci->env != NULL) {
vm_tear_off(pic->ci);
}
if (c.u.i == -1) {
pic->sp += pic->ci[1].retc - 1;
c.u.i = pic->ci[1].retc + 1;
}
argc = c.u.i;
argv = pic->sp - argc;
for (i = 0; i < argc; ++i) {
pic->ci->fp[i] = argv[i];
}
ci = POPCI();
pic->sp = ci->fp + argc;
pic->ip = ci->ip;
/* c is not changed */
goto L_CALL;
}
CASE(OP_RET) {
int i, retc;
pic_value *retv;
pic_callinfo *ci;
if (pic->ci->env != NULL) {
vm_tear_off(pic->ci);
}
pic->ci->retc = c.u.i;
L_RET:
retc = pic->ci->retc;
retv = pic->sp - retc;
if (retc == 0) {
pic->ci->fp[0] = retv[0]; /* copy at least once */
}
for (i = 0; i < retc; ++i) {
pic->ci->fp[i] = retv[i];
}
ci = POPCI();
pic->sp = ci->fp + 1; /* advance only one! */
pic->ip = ci->ip;
NEXT;
}
CASE(OP_LAMBDA) {
pic_value self;
struct pic_irep *irep;
self = pic->ci->fp[0];
if (! pic_proc_p(self)) {
pic_errorf(pic, "logic flaw");
}
irep = pic_proc_ptr(self)->u.irep;
if (! pic_proc_irep_p(pic_proc_ptr(self))) {
pic_errorf(pic, "logic flaw");
}
if (pic->ci->env == NULL) {
vm_push_env(pic);
}
proc = pic_make_proc_irep(pic, irep->irep[c.u.i], pic->ci->env);
PUSH(pic_obj_value(proc));
pic_gc_arena_restore(pic, ai);
NEXT;
}
CASE(OP_CONS) {
pic_value a, b;
pic_gc_protect(pic, b = POP());
pic_gc_protect(pic, a = POP());
PUSH(pic_cons(pic, a, b));
pic_gc_arena_restore(pic, ai);
NEXT;
}
CASE(OP_CAR) {
pic_value p;
p = POP();
PUSH(pic_car(pic, p));
NEXT;
}
CASE(OP_CDR) {
pic_value p;
p = POP();
PUSH(pic_cdr(pic, p));
NEXT;
}
CASE(OP_NILP) {
pic_value p;
p = POP();
PUSH(pic_bool_value(pic_nil_p(p)));
NEXT;
}
#define DEFINE_ARITH_OP(opcode, op, guard) \
CASE(opcode) { \
pic_value a, b; \
b = POP(); \
a = POP(); \
if (pic_int_p(a) && pic_int_p(b)) { \
double f = (double)pic_int(a) op (double)pic_int(b); \
if (INT_MIN <= f && f <= INT_MAX && (guard)) { \
PUSH(pic_int_value((int)f)); \
} \
else { \
PUSH(pic_float_value(f)); \
} \
} \
else if (pic_float_p(a) && pic_float_p(b)) { \
PUSH(pic_float_value(pic_float(a) op pic_float(b))); \
} \
else if (pic_int_p(a) && pic_float_p(b)) { \
PUSH(pic_float_value(pic_int(a) op pic_float(b))); \
} \
else if (pic_float_p(a) && pic_int_p(b)) { \
PUSH(pic_float_value(pic_float(a) op pic_int(b))); \
} \
else { \
pic_errorf(pic, #op " got non-number operands"); \
} \
NEXT; \
}
DEFINE_ARITH_OP(OP_ADD, +, true);
DEFINE_ARITH_OP(OP_SUB, -, true);
DEFINE_ARITH_OP(OP_MUL, *, true);
DEFINE_ARITH_OP(OP_DIV, /, f == round(f));
CASE(OP_MINUS) {
pic_value n;
n = POP();
if (pic_int_p(n)) {
PUSH(pic_int_value(-pic_int(n)));
}
else if (pic_float_p(n)) {
PUSH(pic_float_value(-pic_float(n)));
}
else {
pic_errorf(pic, "unary - got a non-number operand");
}
NEXT;
}
#define DEFINE_COMP_OP(opcode, op) \
CASE(opcode) { \
pic_value a, b; \
b = POP(); \
a = POP(); \
if (pic_int_p(a) && pic_int_p(b)) { \
PUSH(pic_bool_value(pic_int(a) op pic_int(b))); \
} \
else if (pic_float_p(a) && pic_float_p(b)) { \
PUSH(pic_bool_value(pic_float(a) op pic_float(b))); \
} \
else if (pic_int_p(a) && pic_float_p(b)) { \
PUSH(pic_bool_value(pic_int(a) op pic_float(b))); \
} \
else if (pic_float_p(a) && pic_int_p(b)) { \
PUSH(pic_bool_value(pic_float(a) op pic_int(b))); \
} \
else { \
pic_errorf(pic, #op " got non-number operands"); \
} \
NEXT; \
}
DEFINE_COMP_OP(OP_EQ, ==);
DEFINE_COMP_OP(OP_LT, <);
DEFINE_COMP_OP(OP_LE, <=);
CASE(OP_STOP) {
VM_END_PRINT;
return pic_gc_protect(pic, POP());
}
} VM_LOOP_END;
}
pic_value
pic_apply_trampoline(pic_state *pic, struct pic_proc *proc, pic_value args)
{
static const pic_code iseq[2] = {
{ OP_NOP, { .i = 0 } },
{ OP_TAILCALL, { .i = -1 } }
};
pic_value v, *sp;
pic_callinfo *ci;
*pic->sp++ = pic_obj_value(proc);
sp = pic->sp;
pic_for_each (v, args) {
*sp++ = v;
}
ci = PUSHCI();
ci->ip = (pic_code *)iseq;
ci->fp = pic->sp;
ci->retc = (int)pic_length(pic, args);
if (ci->retc == 0) {
return pic_none_value();
} else {
return pic_car(pic, args);
}
}
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