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i.c
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/* i.c -- instructions */
#include "n.h"
#include "i.h"
/* imports */
extern obj cx__2Aglobals_2A;
extern obj cx__2Atransformers_2A;
extern obj cx__2Adynamic_2Dstate_2A;
extern obj cx_continuation_2Dadapter_2Dcode;
extern obj cx_callmv_2Dadapter_2Dclosure;
extern obj cx__2Acurrent_2Dinput_2A;
extern obj cx__2Acurrent_2Doutput_2A;
extern obj cx__2Acurrent_2Derror_2A;
//#define istagged(o, t) istagged_inlined(o, t)
/* forwards */
static struct intgtab_entry *lookup_integrable(int sym);
static int intgtab_count(void);
static int isintegrable(obj x);
static struct intgtab_entry *integrabledata(obj x);
static obj mkintegrable(struct intgtab_entry *);
static int integrable_type(struct intgtab_entry *pi);
static const char *integrable_global(struct intgtab_entry *pi);
static const char *integrable_code(struct intgtab_entry *pi, int n);
static obj *rds_intgtab(obj *r, obj *sp, obj *hp);
static obj *rds_stox(obj *r, obj *sp, obj *hp);
static obj *rds_stoc(obj *r, obj *sp, obj *hp);
static obj *init_modules(obj *r, obj *sp, obj *hp);
/* platform-dependent optimizations */
#if defined(__clang__)
#define unlikely(x) __builtin_expect(x, 0)
#define likely(x) __builtin_expect(x, 1)
#if __clang_major__ >= 13
#define VM_AC_IN_REG
#define outofline __attribute__((noinline))
#define VM_MUSTTAIL_GUARANTEE
#define musttail __attribute__((musttail))
#define regcall __regcall
#define noalias restrict
#else
#define outofline
#define musttail
#define regcall
#define noalias
#endif
/* #pragma GCC optimize ("align-functions=16") */
#define nochecks __attribute__((no_stack_protector, aligned(8)))
/* __attribute__((nocf_check)) */
#define VM_INS_CODE_ALIGNED
#else
#define unlikely(x) (x)
#define likely(x) (x)
#define outofline
#define musttail
#define regcall
#define noalias
#define nochecks
#endif
/* copying objects */
#ifndef OBJCOPY_LOOP
#define objcpy(dst, src, cnt) \
memcpy((dst), (src), (cnt)*sizeof(obj))
#define objmove_left(dst, src, cnt) \
memmove((dst), (src), (cnt)*sizeof(obj))
#define objmove(dst, src, cnt) \
memmove((dst), (src), (cnt)*sizeof(obj))
#else
#define objcpy(dst, src, cnt) \
do { obj *noalias dp__ = (dst), *noalias sp__ = (src); int n__ = (cnt); \
while (n__-- > 0) *dp__++ = *sp__++; } while(0)
#define objmove_left(dst, src, cnt) \
do { int n__ = (cnt); obj *dp__ = (dst), *sp__ = (src); \
while (n__-- > 0) *dp__++ = *sp__++; } while(0)
#define objmove_right(dst, src, cnt) \
do { int n__ = (cnt); obj *dp__ = (dst)+n__, *sp__ = (src)+n__; \
while (n__-- > 0) *--dp__ = *--sp__; } while(0)
#define objmove(dst, src, cnt) \
do { int n__ = (cnt); obj *dp__ = (dst), *sp__ = (src); \
if (dp__ > sp__) { dp__ += n__, sp__ += n; while (n__-- > 0) *--dp__ = *--sp__; } \
else if (dp__ < sp__) while (n__-- > 0) *dp__++ = *sp__++; } while(0)
#endif
#ifdef VM_INS_CODE_ALIGNED /* direct representation */
#define ins_from_obj(x) ((ins_t)(x))
#else /* indirect representation (alignment needed) */
#define ins_from_obj(x) (*(ins_t*)(x))
#endif
/* instruction calling convention (platform-dependent) */
#ifdef VM_AC_IN_REG
#define ILOCALS obj ac, *r, *ip, *sp, *hp
#define IPARAMS obj ac, obj *noalias r, obj *noalias ip, obj *noalias sp, obj *noalias hp
#define IARGS ac, r, ip, sp, hp
#define IARGS1 ac, r, ip+1, sp, hp
#define unload_ac() (ra = ac)
#define reload_ac() (ac = ra)
#else
#define ILOCALS obj *r, *ip, *sp, *hp
#define IPARAMS obj *r, obj *noalias ip, obj *noalias sp, obj *noalias hp
#define IARGS r, ip, sp, hp
#define IARGS1 r, ip+1, sp, hp
#define ac ra
#define unload_ac() (0)
#define reload_ac() (0)
#endif
/* gc-safe obj registers; some of them used for saving/restoring during gc */
#define rk (r[0]) /* #f or any non-false value for unwindi; run result */
#define ra (r[1]) /* shadow reg for the accumulator (argc on call) */
#define rx (r[2]) /* next instruction (index in closure's code) */
#define rd (r[3]) /* current closure/display (vector of [0]=code, display) */
#define rs (r[4]) /* shadow reg for stack pointer */
#define rz (r[5]) /* red zone for stack pointer (r + len - rsz) */
/* the rest of the register file is used as a stack */
#define VM_REGC 6 /* r[0] ... r[5] */
#define VM_STACK_LEN 256000 /* r[6] ... r[256005] */
#define VM_STACK_RSZ 256 /* red zone for overflow checks */
#define VM_STACK_GSZ (VM_STACK_LEN-VM_STACK_RSZ)
/* faster non-debug type testing */
#ifdef NDEBUG /* quick */
static int istagged_inline(obj o, int t) { return isobjptr(o) && hblkref(o, 0) == obj_from_size(t); }
#define istagged(o, t) istagged_inline(o, t)
#endif
/* box representation extras */
#define boxbsz() hbsz(1+1)
#define hend_box() (*--hp = obj_from_size(BOX_BTAG), hendblk(1+1))
/* pair representation extras */
#define pairbsz() hbsz(2+1)
#define hend_pair() (*--hp = obj_from_size(PAIR_BTAG), hendblk(2+1))
/* vector representation extras */
#define vecbsz(n) hbsz((n)+1)
#define hend_vec(n) (*--hp = obj_from_size(VECTOR_BTAG), hendblk((n)+1))
/* record representation extras */
#define recbsz(c) hbsz((c)+1)
#define hend_rec(rtd, c) (*--hp = rtd, hendblk((c)+1))
/* vm closure representation */
#ifdef NDEBUG /* quick */
#define isvmclo(x) (isobjptr(x) && isobjptr(hblkref(x, 0)))
#define vmcloref(x,i) hblkref(x, i)
#define vmclolen(x) hblklen(x)
#define vmclobsz(c) hbsz(c)
#define hend_vmclo(c) hendblk(c)
#else /* slow but thorough */
#define isvmclo isprocedure
#define vmcloref *procedureref
#define vmclolen procedurelen
#define vmclobsz(c) hbsz(c)
#define hend_vmclo(c) hendblk(c)
#endif
/* vm tuple representation (c != 1) */
#define istuple(x) istagged(x, 0)
#define tupleref(x,i) *taggedref(x, 0, i)
#define tuplelen(x) taggedlen(x, 0)
#define tuplebsz(c) hbsz((c)+1)
#define hend_tuple(c) (*--hp = obj_from_size(0), hendblk((c)+1))
/* in/re-loading gc-save shadow registers */
#define unload_ip() (rx = obj_from_fixnum(ip - &vectorref(vmcloref(rd, 0), 0)))
#define reload_ip() (ip = &vectorref(vmcloref(rd, 0), fixnum_from_obj(rx)))
#define unload_sp() (rs = obj_from_fixnum(sp - r))
#define reload_sp() (sp = r + fixnum_from_obj(rs))
/* access to stack, display, global cells */
#define sref(i) (sp[-(i)-1])
#define dref(i) (vmcloref(rd, (i)+1))
#define gref(p) (boxref(p))
#ifdef _DEBUG
static void _sck(obj *s) {
assert(s != NULL);
assert(s >= cxg_regs + VM_REGC);
assert(s < cxg_rend);
}
#define spush(o) (_sck(sp), *sp++ = o)
#define spop() (_sck(sp), *--sp)
#define sdrop(n) (_sck(sp), sp -= (n))
#define sgrow(n) (_sck(sp), sp += (n))
#else
#define spush(o) (*sp++ = o)
#define spop() (*--sp)
#define sdrop(n) (sp -= (n))
#define sgrow(n) (sp += (n))
#endif
/* forcing gc explicitly */
#define hp_collect() do { \
unload_ac(); unload_ip(); \
hp = cxm_hgc(r, sp, hp, 0); \
reload_ac(); reload_ip(); \
} while (0)
/* reserving heap memory inside instructions */
#define hp_reserve(n) do { \
if (unlikely(hp < cxg_heap + (n))) { \
unload_ac(); unload_ip(); \
hp = cxm_hgc(r, sp, hp, n); \
reload_ac(); reload_ip(); \
} } while (0)
#define hp_reserve_inline(n) \
((hp < cxg_heap + (n)) \
? (unload_ac(), unload_ip(), hp = cxm_hgc(r, sp, hp, (n)), reload_ac(), reload_ip(), hp) \
: hp)
#define hp_pushptr(p, pt) \
(hp_reserve_inline(2), *--hp = (obj)(p), *--hp = (obj)(pt), (obj)(hp+1))
/* object representation extras */
#define bool_obj(b) obj_from_bool(b)
#define is_bool(o) is_bool_obj(o)
#define get_bool(o) bool_from_obj(o)
#define char_obj(b) obj_from_char(b)
#define is_char(o) is_char_obj(o)
#define get_char(o) char_from_obj(o)
#define void_obj() obj_from_void(0)
#define is_void(o) (o == obj_from_void(0))
#define is_shebang(o) isshebang(o)
#define get_shebang(o) getshebang(o)
#define shebang_obj(i) mkshebang(i)
#define unit_obj() obj_from_unit()
#define is_unit(o) (o == obj_from_unit())
#define null_obj() mknull()
#define is_null(o) isnull(o)
#define eof_obj() mkeof()
#define is_eof(o) ((o) == mkeof())
#define fixnum_obj(x) obj_from_fixnum(x)
#define is_fixnum(o) is_fixnum_obj(o)
#define are_fixnums(o1, o2) (is_fixnum(o1) && is_fixnum(o2))
#define get_fixnum(o) fixnum_from_obj(o)
#define is_byte(o) is_byte_obj(o)
#define byte_obj(x) obj_from_fixnum((unsigned char)(x))
#define get_byte(o) ((unsigned char)fixnum_from_obj(o))
#ifdef FLONUMS_BOXED
#define flonum_obj(x) hp_pushptr(dupflonum(x), FLONUM_NTAG)
#define is_flonum(o) is_flonum_obj(o)
#define get_flonum(o) flonum_from_obj(o)
#else
#define flonum_obj(x) obj_from_flonum(0, x)
#define is_flonum(o) is_flonum_obj(o)
#define get_flonum(o) flonum_from_obj(o)
#endif
#define is_symbol(o) issymbol(o)
#define get_symbol(o) getsymbol(o)
#define symbol_obj(i) mksymbol(i)
#define is_pair(o) ispair(o)
#define pair_car(o) car(o)
#define pair_cdr(o) cdr(o)
#define is_list(o) islist(o)
#define is_circular(o) iscircular(o)
#define is_noncircular(o) (!iscircular(o))
#define is_vector(o) isvector(o)
#define vector_len(o) vectorlen(o)
#define vector_ref(o, i) vectorref(o, i)
#define string_obj(s) hp_pushptr((s), STRING_NTAG)
#define is_string(o) isstring(o)
#define string_len(o) stringlen(o)
#define string_ref(o, i) (*stringref(o, i))
#define bytevector_obj(s) hp_pushptr((s), BYTEVECTOR_NTAG)
#define is_bytevector(o) isbytevector(o)
#define bytevector_len(o) bytevectorlen(o)
#define bytevector_ref(o, i) (*bytevectorref(o, i))
#define iport_file_obj(fp) hp_pushptr((fp), IPORT_FILE_NTAG)
#define oport_file_obj(fp) hp_pushptr((fp), OPORT_FILE_NTAG)
#define iport_string_obj(fp) hp_pushptr((fp), IPORT_STRING_NTAG)
#define oport_string_obj(fp) hp_pushptr((fp), OPORT_STRING_NTAG)
#define iport_bytevector_obj(fp) hp_pushptr((fp), IPORT_BYTEVECTOR_NTAG)
#define oport_bytevector_obj(fp) hp_pushptr((fp), OPORT_BYTEVECTOR_NTAG)
#define is_iport(o) isiport(o)
#define is_oport(o) isoport(o)
#define is_box(o) isbox(o)
#define box_ref(o) boxref(o)
#define is_proc(o) isvmclo(o)
#define is_tuple(o) (isrecord(o) && recordrtd(o) == 0)
#define tuple_len(o) tuplelen(o)
#define tuple_ref(o, i) tupleref(o, i)
#define is_record(o) (isrecord(o) && recordrtd(o) != 0)
#define record_rtd(o) recordrtd(o)
#define record_len(o) recordlen(o)
#define record_ref(o, i) recordref(o, i)
/* cxi instructions protocol; retval is new hp: */
typedef obj* regcall (*ins_t)(IPARAMS);
/* calling next instruction and returning from instruction */
#define goih(ih) musttail return ((ih)(IARGS))
#define goi(name) musttail return (glue(cxi_, name)(IARGS))
#define gonexti() musttail return ((ins_from_obj(*ip))(IARGS1))
#define unwindi(c) return (unload_ac(), unload_ip(), rd = (c), hp)
#define check_sp() if (unlikely(sp > (obj*)rz)) fail("stack overflow")
#ifdef VM_MUSTTAIL_GUARANTEE
#define callsubi() check_sp(); reload_ip(); gonexti()
#define retfromi() reload_ip(); gonexti()
#define trampcnd() (0)
#else
#define callsubi() check_sp(); unload_sp(); return hp
#define retfromi() unload_sp(); return hp
#define trampcnd() (rd)
#endif
/* defining instruction helpers */
#define define_instrhelper(name) \
static obj* regcall outofline nochecks name(IPARAMS)
/* defining and binding instructions */
#define define_instruction(name) \
obj* regcall nochecks glue(cxi_, name)(IPARAMS)
#ifdef VM_INS_CODE_ALIGNED
#define declare_instruction_global(name) \
obj glue(cx_ins_2D, name) = (obj)(&glue(cxi_, name));
#else
#define declare_instruction_global(name) \
static ins_t glue(cxib_, name)[1] = { &glue(cxi_, name) }; \
obj glue(cx_ins_2D, name) = (obj)(&glue(cxib_, name)[0]);
#endif
static obj vmhost(obj);
obj vmcases[13] = {
(obj)vmhost, (obj)vmhost, (obj)vmhost, (obj)vmhost,
(obj)vmhost, (obj)vmhost, (obj)vmhost, (obj)vmhost,
(obj)vmhost, (obj)vmhost, (obj)vmhost, (obj)vmhost,
(obj)vmhost
};
/* vmhost procedure */
static obj vmhost(obj pc)
{
ILOCALS;
int rc = cxg_rc, i;
r = cxg_regs; hp = cxg_hp;
jump:
switch (objptr_from_obj(pc)-vmcases) {
case 0: /* execute-thunk-closure */
/* r[0] = self, r[1] = k, r[2] = closure */
{ obj k, arg;
assert(rc == 3);
k = r[1]; arg = r[2];
r = cxm_rgc(NULL, VM_REGC + VM_STACK_LEN);
rk = k; /* continuation, kept there */
ra = obj_from_fixnum(0); /* argc, shadow ac */
rx = obj_from_fixnum(0); /* shadow ip */
rd = arg; /* thunk closure to execute */
rs = obj_from_fixnum(VM_REGC); /* sp */
rz = (obj)(r + VM_STACK_GSZ); /* sp red zone */
do { /* unwindi trampoline */
reload_ac(); /* ra => ac */
reload_ip(); /* rd/rx => ip */
reload_sp(); /* rs => sp */
hp = (ins_from_obj(*ip))(IARGS1);
} while (likely(trampcnd()));
/* r[0] = k, r[1] = result */
r[2] = r[1];
r[1] = obj_from_ktrap();
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 1: /* make-closure */
/* r[0] = clo, r[1] = k, r[2] = code */
{ assert(rc == 3);
r[0] = r[1]; r[1] = r[2];
/* r[0] = k; r[1] = code */
hreserve(vmclobsz(1), 2); /* 2 live regs */
*--hp = r[1];
r[2] = hend_vmclo(1);
r[1] = obj_from_ktrap();
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 2: /* decode-sexp */
/* r[0] = clo, r[1] = k, r[2] = xstr */
{ assert(rc == 3);
r[0] = r[1]; r[1] = r[2];
/* r[0] = k; r[1] = xstr */
for (i = 3; i < VM_REGC; ++i) r[i] = 0;
rz = (obj)(r + VM_STACK_GSZ); /* sp red zone */
hp = rds_stox(r, r+VM_REGC, hp); /* r[1] -> r[1] */
r[2] = r[1]; r[1] = obj_from_ktrap();
/* r[0] = k; r[1] = ek; r[2] = code */
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 3: /* decode-code */
/* r[0] = clo, r[1] = k, r[2] = cstr */
{ assert(rc == 3);
r[0] = r[1]; r[1] = r[2];
/* r[0] = k; r[1] = cstr */
for (i = 3; i < VM_REGC; ++i) r[i] = 0;
rz = (obj)(r + VM_STACK_GSZ); /* sp red zone */
hp = rds_stoc(r, r+VM_REGC, hp); /* r[1] -> r[1] */
r[2] = r[1]; r[1] = obj_from_ktrap();
/* r[0] = k; r[1] = ek; r[2] = code */
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 4: /* find-integrable-encoding */
/* r[0] = clo, r[1] = k, r[2] = id, r[3] = argc */
{ assert(rc == 4);
r[2] = obj_from_bool(0);;
r[0] = r[1]; r[1] = obj_from_ktrap();
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 5: /* encode-integrable */
/* r[0] = clo, r[1] = k, r[2] = argc, r[3] = pe, r[4] = port */
{ assert(rc == 5);
assert(0);
r[0] = r[1]; r[1] = obj_from_ktrap();
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 6: /* install-global-lambdas */
/* r[0] = clo, r[1] = k */
{ assert(rc == 2);
r[0] = r[1];
for (i = 2; i < VM_REGC; ++i) r[i] = 0;
rz = (obj)(r + VM_STACK_GSZ); /* sp red zone */
hp = rds_intgtab(r, r+VM_REGC, hp);
r[1] = obj_from_ktrap();
r[2] = obj_from_void(0);
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 7: /* initialize-modules */
/* r[0] = clo, r[1] = k */
{ assert(rc == 2);
r[0] = r[1];
r = cxm_rgc(NULL, VM_REGC + VM_STACK_LEN);
for (i = 2; i < VM_REGC; ++i) r[i] = 0;
rz = (obj)(r + VM_STACK_GSZ); /* sp red zone */
hp = init_modules(r, r+VM_REGC, hp);
r[1] = obj_from_ktrap();
r[2] = obj_from_void(0);
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 8: /* integrable? */
/* r[0] = clo, r[1] = k, r[2] = obj */
{ assert(rc == 3);
r[2] = obj_from_bool(isintegrable(r[2]));
r[0] = r[1]; r[1] = obj_from_ktrap();
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 9: /* lookup-integrable */
/* r[0] = clo, r[1] = k, r[2] = id */
{ assert(rc == 3);
if (issymbol(r[2])) {
int sym = getsymbol(r[2]);
struct intgtab_entry *pe = lookup_integrable(sym);
r[2] = pe ? mkintegrable(pe) : obj_from_bool(0);
} else r[2] = obj_from_bool(0);
r[0] = r[1]; r[1] = obj_from_ktrap();
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 10: /* integrable-type */
/* r[0] = clo, r[1] = k, r[2] = ig */
{ assert(rc == 3);
if (isintegrable(r[2])) {
int it = integrable_type(integrabledata(r[2]));
r[2] = it ? obj_from_char(it) : obj_from_bool(0);
} else r[2] = obj_from_bool(0);
r[0] = r[1]; r[1] = obj_from_ktrap();
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 11: /* integrable-global */
/* r[0] = clo, r[1] = k, r[2] = ig */
{ assert(rc == 3);
if (isintegrable(r[2])) {
const char *igs = integrable_global(integrabledata(r[2]));
r[2] = igs ? mksymbol(internsym((char*)igs)) : obj_from_bool(0);
} else r[2] = obj_from_bool(0);
r[0] = r[1]; r[1] = obj_from_ktrap();
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
case 12: /* integrable-code */
/* r[0] = clo, r[1] = k, r[2] = ig, r[3] = i */
{ assert(rc == 4);
if (isintegrable(r[2]) && is_fixnum(r[3])) {
const char *cs = integrable_code(integrabledata(r[2]), get_fixnum(r[3]));
r[2] = cs ? hpushstr(3, newstring((char*)cs)) : obj_from_bool(0);
} else r[2] = obj_from_bool(0);
r[0] = r[1]; r[1] = obj_from_ktrap();
pc = objptr_from_obj(r[0])[0];
rc = 3;
goto jump; }
default: /* inter-host call */
cxg_hp = hp;
cxm_rgc(r, 1);
cxg_rc = rc;
return pc;
}
}
/* instructions for basic vm machinery */
define_instrhelper(cxi_fail) {
fprintf(stderr, "run-time failure: %s\n", (char*)ac);
ac = void_obj(); /* so it is not printed by repl */
unwindi(0);
}
define_instrhelper(cxi_failactype) {
char *msg = (char*)spop(); obj p;
fprintf(stderr, "run-time failure: argument is not a %s:\n", msg);
p = oport_file_obj(stderr); spush(p);
oportputcircular(ac, p, 0);
fputc('\n', stderr);
spop();
ac = void_obj(); /* so it is not printed by repl */
unwindi(0);
}
#define fail(msg) do { ac = (obj)msg; musttail return cxi_fail(IARGS); } while (0)
#define failtype(x, msg) do { ac = (x); spush((obj)msg); musttail return cxi_failactype(IARGS); } while (0)
#define failactype(msg) do { spush((obj)msg); musttail return cxi_failactype(IARGS); } while (0)
#define ckp(x) do { obj _x = (x); if (unlikely(!is_pair(_x))) \
{ ac = _x; spush((obj)"pair"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckl(x) do { obj _x = (x); if (unlikely(!is_list(_x))) \
{ ac = _x; spush((obj)"list"); musttail return cxi_failactype(IARGS); } } while (0)
#define cku(x) do { obj _x = (x); if (unlikely(!is_null(_x))) \
{ ac = _x; spush((obj)"proper list"); musttail return cxi_failactype(IARGS); } } while (0)
#define cko(x) do { obj _x = (x); if (unlikely(!is_record(_x))) \
{ ac = _x; spush((obj)"record"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckv(x) do { obj _x = (x); if (unlikely(!is_vector(_x))) \
{ ac = _x; spush((obj)"vector"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckc(x) do { obj _x = (x); if (unlikely(!is_char(_x))) \
{ ac = _x; spush((obj)"char"); musttail return cxi_failactype(IARGS); } } while (0)
#define cks(x) do { obj _x = (x); if (unlikely(!is_string(_x))) \
{ ac = _x; spush((obj)"string"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckb(x) do { obj _x = (x); if (unlikely(!is_bytevector(_x))) \
{ ac = _x; spush((obj)"bytevector"); musttail return cxi_failactype(IARGS); } } while (0)
#define cki(x) do { obj _x = (x); if (unlikely(!is_fixnum(_x))) \
{ ac = _x; spush((obj)"fixnum"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckj(x) do { obj _x = (x); if (unlikely(!is_flonum(_x))) \
{ ac = _x; spush((obj)"flonum"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckn(x) do { obj _x = (x); if (unlikely(!is_fixnum(_x) && !is_flonum(_x))) \
{ ac = _x; spush((obj)"number"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckk(x) do { obj _x = (x); if (unlikely(!is_fixnum(_x) || get_fixnum(_x) < 0)) \
{ ac = _x; spush((obj)"nonnegative fixnum"); musttail return cxi_failactype(IARGS); } } while (0)
#define ck8(x) do { obj _x = (x); if (unlikely(!is_byte(_x))) \
{ ac = _x; spush((obj)"byte"); musttail return cxi_failactype(IARGS); } } while (0)
#define cky(x) do { obj _x = (x); if (unlikely(!is_symbol(_x))) \
{ ac = _x; spush((obj)"symbol"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckr(x) do { obj _x = (x); if (unlikely(!is_iport(_x))) \
{ ac = _x; spush((obj)"input port"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckw(x) do { obj _x = (x); if (unlikely(!is_oport(_x))) \
{ ac = _x; spush((obj)"output port"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckx(x) do { obj _x = (x); if (unlikely(!is_proc(_x))) \
{ ac = _x; spush((obj)"procedure"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckz(x) do { obj _x = (x); if (unlikely(!is_box(_x))) \
{ ac = _x; spush((obj)"box, cell, or promise"); musttail return cxi_failactype(IARGS); } } while (0)
#define ckg(x) do { obj _x = (x); if (unlikely(!isintegrable(_x))) \
{ ac = _x; spush((obj)"integrable entry"); musttail return cxi_failactype(IARGS); } } while (0)
#define cksb(x) do { obj _x = (x); if (unlikely(!is_shebang(_x))) \
{ ac = _x; spush((obj)"directive"); musttail return cxi_failactype(IARGS); } } while (0)
define_instruction(halt) {
unwindi(0);
}
define_instruction(panic) {
obj l, p; cks(ac); ckl(sref(0));
p = oport_file_obj(stderr);
fprintf(stderr, "error: %s", stringchars(ac));
if (is_pair(sref(0))) fputs(":\n", stderr);
else fputs("\n", stderr);
for (l = sref(0); is_pair(l); l = pair_cdr(l)) {
oportputcircular(pair_car(l), p, 0);
fputc('\n', stderr);
}
sdrop(1);
ac = void_obj();
unwindi(0);
}
define_instruction(abort) {
/* exit code ignored */
abort();
unwindi(0);
}
define_instruction(exit) {
int excode;
if (ac == bool_obj(0)) excode = 1;
else if (ac == bool_obj(1)) excode = 0;
else if (is_fixnum(ac)) excode = (int)get_fixnum(ac);
else excode = 1;
exit(excode);
unwindi(0);
}
define_instruction(lit) {
ac = *ip++;
gonexti();
}
define_instruction(sref) {
int i = get_fixnum(*ip++);
ac = sref(i);
gonexti();
}
define_instruction(dref) {
int i = get_fixnum(*ip++);
ac = dref(i);
gonexti();
}
define_instruction(gref) {
obj p = *ip++;
ac = gref(p);
gonexti();
}
define_instruction(iref) {
ac = box_ref(ac);
gonexti();
}
define_instruction(iset) {
box_ref(ac) = spop();
gonexti();
}
define_instruction(dclose) {
int i, n = get_fixnum(*ip++), c = n+1;
hp_reserve(vmclobsz(c));
for (i = n-1; i >= 0; --i) *--hp = sref(i); /* display */
*--hp = *ip++; /* code */
ac = hend_vmclo(c); /* closure */
sdrop(n);
gonexti();
}
define_instruction(sbox) {
int i = get_fixnum(*ip++);
hp_reserve(boxbsz());
*--hp = sref(i);
sref(i) = hend_box();
gonexti();
}
define_instruction(br) {
int dx = get_fixnum(*ip++);
ip += dx;
gonexti();
}
define_instruction(brt) {
int dx = get_fixnum(*ip++);
if (ac) ip += dx;
gonexti();
}
define_instruction(brnot) {
int dx = get_fixnum(*ip++);
if (!ac) ip += dx;
gonexti();
}
define_instruction(andbo) {
if (ac) { /* go to next binary instruction w/2 args */
ac = spop();
} else { /* skip the next instruction, drop its args */
sdrop(2);
ip += 1;
}
gonexti();
}
define_instruction(sseti) {
int i = get_fixnum(*ip++);
box_ref(sref(i)) = ac;
gonexti();
}
define_instruction(dseti) {
int i = get_fixnum(*ip++);
box_ref(dref(i)) = ac;
gonexti();
}
define_instruction(gloc) {
ac = *ip++;
gonexti();
}
define_instruction(gset) {
obj p = *ip++;
gref(p) = ac;
gonexti();
}
define_instruction(appl) {
int n, i; obj l = spop(), t = l;
for (n = 0; is_pair(t); t = pair_cdr(t)) ++n; sgrow(n);
for (i = 0; i < n; ++i, l = pair_cdr(l)) sref(i) = pair_car(l);
ckx(ac); rd = ac; rx = fixnum_obj(0);
ac = fixnum_obj(n); /* argc */
callsubi();
}
define_instruction(cwmv) {
obj t = ac, x = spop();
ckx(t); ckx(x);
/* we can run in constant space in some situations */
if (vmcloref(x, 0) == cx_continuation_2Dadapter_2Dcode
&& vmcloref(x, 1) == cx__2Adynamic_2Dstate_2A) {
/* arrange call of t with x as continuation */
/* [0] adapter_code, [1] dynamic_state */
int n = vmclolen(x) - 2;
assert((cxg_rend - cxg_regs - VM_REGC) > n);
sp = r + VM_REGC; /* stack is empty */
objcpy(sp, &vmcloref(x, 2), n);
sp += n; /* contains n elements now */
rd = t; rx = fixnum_obj(0);
ac = fixnum_obj(0);
callsubi();
} else {
/* arrange return to cwmv code w/x */
spush(x);
spush(cx_callmv_2Dadapter_2Dclosure);
spush(fixnum_obj(0));
/* call the producer */
rd = t; rx = fixnum_obj(0); ac = fixnum_obj(0);
callsubi();
}
}
define_instruction(rcmv) {
/* single-value producer call returns here with result in ac, cns on stack */
obj val = ac, x = spop();
/* tail-call the consumer with the returned value(s) */
if (is_unit(val)) { /* (values) in improper context */
ac = fixnum_obj(0);
} else if (is_tuple(val)) { /* (values a1 a2 a ...) in improper context */
int n = tuple_len(val), i;
for (i = n-1; i >= 0; --i) spush(tuple_ref(val, i));
ac = fixnum_obj(n);
} else { /* regular single value */
spush(val); ac = fixnum_obj(1);
}
rd = x; rx = fixnum_obj(0);
callsubi();
}
define_instruction(sdmv) {
/* sending values on stack, ac contains argc */
if (ac == fixnum_obj(1)) {
/* can return anywhere, including rcmv */
ac = spop();
rx = spop();
rd = spop();
retfromi();
} else {
/* can only pseudo-return to rcmv */
int n = get_fixnum(ac), m = 3, i;
if (sref(n) == fixnum_obj(0) && sref(n+1) == cx_callmv_2Dadapter_2Dclosure) {
/* tail-call the consumer with the produced values */
rd = sref(n+2); rx = fixnum_obj(0); /* cns */
/* NB: can be sped up for popular cases: n == 0, n == 2 */
objmove_left(sp-n-m, sp-n, n);
sdrop(m); callsubi();
} else if (n == 0) { /* return unit (n = 0) */
ac = unit_obj();
rx = spop();
rd = spop();
retfromi();
} else { /* return args as tuple (n > 1) */
hp_reserve(tuplebsz(n));
for (i = n-1; i >= 0; --i) *--hp = sref(i);
ac = hend_tuple(n);
sdrop(n);
rx = spop();
rd = spop();
retfromi();
}
}
}
define_instruction(lck) {
int m = get_fixnum(*ip++);
int n; cki(sref(m)); ckx(sref(m+1));
n = (int)(sp-m-(r+VM_REGC));
hp_reserve(vmclobsz(n+2));
hp -= n; objcpy(hp, sp-n-m, n);
/* [0] adapter_code, [1] dynamic_state */
*--hp = cx__2Adynamic_2Dstate_2A;
*--hp = cx_continuation_2Dadapter_2Dcode;
ac = hend_vmclo(n+2);
gonexti();
}
define_instruction(lck0) {
int n; cki(sref(0)); ckx(sref(1));
n = (int)(sp-(r+VM_REGC));
hp_reserve(vmclobsz(n+2));
hp -= n; objcpy(hp, sp-n, n);
/* [0] adapter_code, [1] dynamic_state */
*--hp = cx__2Adynamic_2Dstate_2A;
*--hp = cx_continuation_2Dadapter_2Dcode;
ac = hend_vmclo(n+2);
gonexti();
}
define_instruction(wck) {
obj x = ac, t = spop(); ckx(t); ckx(x);
if (vmcloref(x, 0) != cx_continuation_2Dadapter_2Dcode)
failactype("continuation");
/* [0] adapter_code, [1] dynamic_state */
if (vmcloref(x, 1) == cx__2Adynamic_2Dstate_2A) {
/* restore cont stack and invoke t there */
int n = vmclolen(x) - 2;
assert((cxg_rend - cxg_regs - VM_REGC) > n);
sp = r + VM_REGC; /* stack is empty */
objcpy(sp, &vmcloref(x, 2), n);
sp += n; /* contains n elements now */
rd = t; rx = fixnum_obj(0);
ac = fixnum_obj(0);
callsubi();
} else {
/* have to arrange call of cont adapter */
spush(x);
spush(cx_callmv_2Dadapter_2Dclosure);
spush(fixnum_obj(0));
/* call the thunk as producer */
rd = t; rx = fixnum_obj(0);
ac = fixnum_obj(0);
callsubi();
}
}
define_instruction(wckr) {
obj x = ac, o = spop(); ckx(x);
if (vmcloref(x, 0) != cx_continuation_2Dadapter_2Dcode)
failactype("continuation");
/* [0] adapter_code, [1] dynamic_state */
if (vmcloref(x, 1) == cx__2Adynamic_2Dstate_2A) {
/* restore cont stack and return o there */
int n = vmclolen(x) - 2;
assert((cxg_rend - cxg_regs - VM_REGC) > n);
sp = r + VM_REGC; /* stack is empty */
objcpy(sp, &vmcloref(x, 2), n);
sp += n;
ac = o;
rx = spop();
rd = spop();
retfromi();
} else {
/* have to arrange call of cont adapter */
spush(o);
rd = x; rx = fixnum_obj(0);
ac = fixnum_obj(1);
callsubi();
}
}
define_instruction(rck) {
/* called with continuation as rd:
* in: ac:argc, args on stack, rd display is dys, saved stack */
if (vmcloref(rd, 1) != cx__2Adynamic_2Dstate_2A) {
/* need to run the rest of the code to unwind/rewind on the
* old stack; rck will be called again when done */
gonexti();
} else if (ac == fixnum_obj(1)) { /* easy, popular case */
ac = rd;
goi(wckr);
} else { /* multiple results case */
/* rd[0] adapter_code, rd[1] dynamic_state */
int c = get_fixnum(ac), n = vmclolen(rd) - 2, i;
obj *ks = &vmcloref(rd, 2), *ke = ks + n;
if (ke-ks > 3 && *--ke == fixnum_obj(0) && *--ke == cx_callmv_2Dadapter_2Dclosure) {
obj *sb = r + VM_REGC;
rd = *--ke; rx = fixnum_obj(0); n = (int)(ke - ks); /* cns */
/* arrange stack as follows: [ks..ke] [arg ...] */
assert((cxg_rend - cxg_regs - VM_REGC) > n + c);
if (c) objmove(sb+n, sp-c, c);
objcpy(sb, ks, n);
sp = sb+n+c; callsubi();
} else if (c == 0) { /* return unit (n = 0) */
spush(unit_obj());
ac = rd;
goi(wckr);
} else { /* return args as tuple (n > 1) */
hp_reserve(tuplebsz(c));
for (i = c-1; i >= 0; --i) *--hp = sref(i);
ac = hend_tuple(c);
sdrop(c);
spush(ac);
ac = rd;
goi(wckr);
}
}
}
define_instruction(dys) {
ac = cx__2Adynamic_2Dstate_2A;
gonexti();
}
define_instruction(setdys) {
cx__2Adynamic_2Dstate_2A = ac;
gonexti();
}
define_instruction(save) {
int dx = get_fixnum(*ip++);
spush(rd);
spush(fixnum_obj(ip + dx - &vector_ref(vmcloref(rd, 0), 0)));
gonexti();
}
define_instruction(push) { spush(ac); gonexti(); }
define_instruction(jdceq) {
obj v = *ip++, i = *ip++;
if (ac == v) {
rd = dref(get_fixnum(i));
rx = fixnum_obj(0);
callsubi();
}
gonexti();
}
define_instruction(jdcge) {
obj v = *ip++, i = *ip++;
if (ac >= v) { /* unsigned tagged fixnums can be compared as-is */
rd = dref(get_fixnum(i));
rx = fixnum_obj(0);
callsubi();
}
gonexti();
}
define_instruction(jdref) {
int i = get_fixnum(*ip++);
rd = dref(i);
rx = fixnum_obj(0);
callsubi();
}
define_instruction(call) {
int n = get_fixnum(*ip++);
ckx(ac); rd = ac; rx = fixnum_obj(0);
ac = fixnum_obj(n); /* argc */
callsubi();
}
define_instruction(scall) {
int m = get_fixnum(*ip++), n = get_fixnum(*ip++);
ckx(ac); rd = ac; rx = fixnum_obj(0);
ac = fixnum_obj(n); /* argc */
objmove_left(sp-n-m, sp-n, n);
sdrop(m);
callsubi();
}
define_instruction(return) {
rx = spop();
rd = spop();
retfromi();
}
define_instruction(sreturn) {
int n = get_fixnum(*ip++);
sdrop(n);
rx = spop();
rd = spop();
retfromi();
}