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value.c
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353 lines (307 loc) · 10 KB
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#include "devs_internal.h"
#include <math.h>
#include <stdlib.h>
#include <limits.h>
const value_t devs_zero = {.exp_sign = DEVS_INT_TAG, .val_int32 = 0};
const value_t devs_one = {.exp_sign = DEVS_INT_TAG, .val_int32 = 1};
const value_t devs_int_min = {.exp_sign = DEVS_INT_TAG, .val_int32 = INT_MIN};
const value_t devs_max_int_1 = {._f = 0x80000000U};
#define SPECIAL(n) \
{ .exp_sign = DEVS_HANDLE_TAG + DEVS_HANDLE_TYPE_SPECIAL, .val_int32 = n }
const value_t devs_true = SPECIAL(DEVS_SPECIAL_TRUE);
const value_t devs_false = SPECIAL(DEVS_SPECIAL_FALSE);
const value_t devs_nan = SPECIAL(DEVS_SPECIAL_NAN);
const value_t devs_inf = SPECIAL(DEVS_SPECIAL_INF);
const value_t devs_minf = SPECIAL(DEVS_SPECIAL_MINF);
value_t devs_value_from_double(double v) {
switch (fpclassify(v)) {
case FP_NAN:
return devs_nan;
case FP_INFINITE:
return v > 0 ? devs_inf : devs_minf;
case FP_SUBNORMAL:
case FP_ZERO: // this is both 0.0 and -0.0
return devs_zero;
default:
break;
}
value_t t;
value_t r;
t._f = v;
int m32z = t.mantisa32 == 0;
r.exp_sign = DEVS_INT_TAG;
if (m32z && t.exp_sign == 0)
return devs_zero;
int e = t.exponent - 0x3ff;
if (e >= 0) {
if (e <= 20) {
if (m32z && (e == 20 || (t.mantisa20 << (e + 12)) == 0)) {
r.val_int32 = (t.mantisa20 | (1 << 20)) >> (20 - e);
goto int_sign;
}
} else {
if (e > 30) {
if (m32z && t.exp_sign == 0xc1e00000)
return devs_int_min;
} else {
if ((t.mantisa32 << (e - 20)) == 0) {
r.val_int32 =
((t.mantisa20 | (1 << 20)) << (e - 20)) | (t.mantisa32 >> (32 - (e - 20)));
goto int_sign;
}
}
}
}
return t;
int_sign:
if (t.sign)
r.val_int32 = -r.val_int32;
return r;
}
value_t devs_value_from_int(int v) {
value_t r;
r.exp_sign = DEVS_INT_TAG;
r.val_int32 = v;
return r;
}
value_t devs_value_from_bool(int v) {
return v ? devs_true : devs_false;
}
value_t devs_value_from_pointer(devs_ctx_t *ctx, int type, void *ptr) {
uint32_t v;
if (ptr == NULL)
return devs_null;
JD_ASSERT(devs_handle_type_is_ptr(type));
JD_ASSERT(devs_gc_obj_valid(ctx, ptr));
#if JD_64
v = (uintptr_t)ptr - (uintptr_t)devs_gc_base_addr(ctx->gc);
JD_ASSERT((v >> 24) == 0);
#else
v = (uintptr_t)ptr;
#endif
return devs_value_from_handle(type, v);
}
#if JD_64
void *devs_handle_ptr_value(devs_ctx_t *ctx, value_t t) {
if (devs_handle_is_ptr(t))
return (void *)((uintptr_t)devs_gc_base_addr(ctx->gc) + t.mantisa32);
JD_PANIC();
return NULL;
}
#endif
double devs_value_to_double(devs_ctx_t *ctx, value_t v) {
if (devs_is_tagged_int(v))
return (double)v.val_int32;
if (devs_handle_type(v) == DEVS_HANDLE_TYPE_FLOAT64)
return v._f;
if (devs_is_special(v))
switch (devs_handle_value(v)) {
case DEVS_SPECIAL_NULL:
case DEVS_SPECIAL_FALSE:
return 0;
case DEVS_SPECIAL_TRUE:
return 1;
case DEVS_SPECIAL_INF:
return INFINITY;
case DEVS_SPECIAL_MINF:
return -INFINITY;
default:
return NAN;
}
if (devs_is_string(ctx, v)) {
unsigned sz;
const char *data = devs_string_get_utf8(ctx, v, &sz);
char *endp;
double d = strtod(data, &endp);
if (data != endp)
return d;
}
return NAN;
}
int32_t devs_value_to_int(devs_ctx_t *ctx, value_t v) {
if (devs_is_tagged_int(v))
return v.val_int32;
if (devs_is_special(v))
return devs_handle_value(v) >= DEVS_SPECIAL_TRUE ? 1 : 0;
double vv = devs_value_to_double(ctx, v);
if (isnan(vv))
return 0;
double rem = fmod(trunc(vv), 4294967296.0);
if (rem < 0.0)
rem += 4294967296.0;
return (int32_t)((uint32_t)rem);
}
bool devs_value_to_bool(devs_ctx_t *ctx, value_t v) {
if (devs_is_tagged_int(v))
return !!v.val_int32;
if (devs_is_special(v))
return devs_handle_value(v) >= DEVS_SPECIAL_TRUE;
if (devs_is_string(ctx, v)) {
unsigned sz;
devs_string_get_utf8(ctx, v, &sz);
return sz > 0;
}
if (devs_is_handle(v))
return 1;
return v._f == 0.0 ? true : false;
}
bool devs_is_buffer(devs_ctx_t *ctx, value_t v) {
switch (devs_handle_type(v)) {
case DEVS_HANDLE_TYPE_GC_OBJECT:
return devs_gc_tag(devs_handle_ptr_value(ctx, v)) == DEVS_GC_TAG_BUFFER;
case DEVS_HANDLE_TYPE_IMG_BUFFERISH:
return devs_bufferish_is_buffer(v);
default:
return false;
}
}
bool devs_buffer_is_writable(devs_ctx_t *ctx, value_t v) {
return devs_is_buffer(ctx, v) && devs_handle_type(v) != DEVS_HANDLE_TYPE_IMG_BUFFERISH;
}
void *devs_buffer_data(devs_ctx_t *ctx, value_t v, unsigned *sz) {
JD_ASSERT(devs_is_buffer(ctx, v));
switch (devs_handle_type(v)) {
case DEVS_HANDLE_TYPE_GC_OBJECT: {
devs_buffer_t *buf = devs_handle_ptr_value(ctx, v);
if (sz)
*sz = buf->length;
return buf->data;
}
case DEVS_HANDLE_TYPE_IMG_BUFFERISH: {
// TODO optimize - we know it's a buffer in range
unsigned idx = devs_handle_value(v);
return (void *)devs_get_static_utf8(ctx, idx, sz);
}
default:
JD_PANIC();
return NULL;
}
}
const void *devs_bufferish_data(devs_ctx_t *ctx, value_t v, unsigned *sz) {
if (devs_is_buffer(ctx, v))
return devs_buffer_data(ctx, v, sz);
else if (devs_is_string(ctx, v))
return devs_string_get_utf8(ctx, v, sz);
else {
if (sz)
*sz = 0;
return NULL;
}
}
void *devs_value_to_gc_obj(devs_ctx_t *ctx, value_t v) {
if (devs_handle_type(v) == DEVS_HANDLE_TYPE_GC_OBJECT)
return devs_handle_ptr_value(ctx, v);
return NULL;
}
bool devs_is_array(devs_ctx_t *ctx, value_t v) {
return devs_gc_tag(devs_value_to_gc_obj(ctx, v)) == DEVS_GC_TAG_ARRAY;
}
unsigned devs_value_typeof(devs_ctx_t *ctx, value_t v) {
uint32_t hv;
if (devs_is_tagged_int(v))
return DEVS_OBJECT_TYPE_NUMBER;
switch (devs_handle_type(v)) {
case DEVS_HANDLE_TYPE_FLOAT64:
return DEVS_OBJECT_TYPE_NUMBER;
case DEVS_HANDLE_TYPE_SPECIAL:
switch ((hv = devs_handle_value(v))) {
case DEVS_SPECIAL_NULL:
return DEVS_OBJECT_TYPE_NULL;
case DEVS_SPECIAL_FALSE:
case DEVS_SPECIAL_TRUE:
return DEVS_OBJECT_TYPE_BOOL;
case DEVS_SPECIAL_INF:
case DEVS_SPECIAL_MINF:
case DEVS_SPECIAL_NAN:
return DEVS_OBJECT_TYPE_NUMBER;
default:
if (devs_handle_is_builtin(hv))
return DEVS_OBJECT_TYPE_MAP;
else if (devs_handle_is_throw_jmp(hv))
return DEVS_OBJECT_TYPE_EXOTIC;
else
JD_PANIC();
}
case DEVS_HANDLE_TYPE_FIBER:
return DEVS_OBJECT_TYPE_FIBER;
case DEVS_HANDLE_TYPE_BOUND_FUNCTION:
case DEVS_HANDLE_TYPE_BOUND_FUNCTION_STATIC:
case DEVS_HANDLE_TYPE_CLOSURE:
case DEVS_HANDLE_TYPE_STATIC_FUNCTION:
return DEVS_OBJECT_TYPE_FUNCTION;
case DEVS_HANDLE_TYPE_GC_OBJECT:
switch (devs_gc_tag(devs_handle_ptr_value(ctx, v))) {
case DEVS_GC_TAG_STRING:
return DEVS_OBJECT_TYPE_STRING;
case DEVS_GC_TAG_PACKET:
return DEVS_OBJECT_TYPE_PACKET;
case DEVS_GC_TAG_SHORT_MAP:
case DEVS_GC_TAG_HALF_STATIC_MAP:
case DEVS_GC_TAG_MAP:
return DEVS_OBJECT_TYPE_MAP;
case DEVS_GC_TAG_ARRAY:
return DEVS_OBJECT_TYPE_ARRAY;
case DEVS_GC_TAG_BUFFER:
return DEVS_OBJECT_TYPE_BUFFER;
case DEVS_GC_TAG_BOUND_FUNCTION:
return DEVS_OBJECT_TYPE_FUNCTION;
case DEVS_GC_TAG_BUILTIN_PROTO:
default:
JD_PANIC();
return 0;
}
case DEVS_HANDLE_TYPE_IMG_BUFFERISH:
return devs_bufferish_is_buffer(v) ? DEVS_OBJECT_TYPE_BUFFER : DEVS_OBJECT_TYPE_STRING;
case DEVS_HANDLE_TYPE_ROLE_MEMBER:
return (devs_decode_role_packet(ctx, v, NULL)->code & DEVS_PACKETSPEC_CODE_MASK) ==
DEVS_PACKETSPEC_CODE_COMMAND
? DEVS_OBJECT_TYPE_FUNCTION
: DEVS_OBJECT_TYPE_MAP;
case DEVS_HANDLE_TYPE_ROLE:
return DEVS_OBJECT_TYPE_ROLE;
default:
JD_PANIC();
return 0;
}
}
bool devs_is_nullish(value_t t) {
if (devs_is_special(t))
switch (devs_handle_value(t)) {
case DEVS_SPECIAL_FALSE:
case DEVS_SPECIAL_NULL:
case DEVS_SPECIAL_NAN:
return true;
}
return false;
}
bool devs_value_ieee_eq(devs_ctx_t *ctx, value_t a, value_t b) {
if (devs_is_nan(a) && devs_is_nan(b))
return false;
return devs_value_eq(ctx, a, b);
}
// Values are equal if they share the exact same representation,
// or if they are both strings and have the same contents.
// NaN is handled in devs_value_ieee_eq().
bool devs_value_eq(devs_ctx_t *ctx, value_t a, value_t b) {
if (a.u64 == b.u64)
return true;
if (devs_is_string(ctx, a) && devs_is_string(ctx, b)) {
unsigned alen, blen;
const char *aptr = devs_string_get_utf8(ctx, a, &alen);
const char *bptr = devs_string_get_utf8(ctx, b, &blen);
return alen == blen && memcmp(aptr, bptr, alen) == 0;
}
return false;
#if 0
int ta = devs_handle_type(a);
int tb = devs_handle_type(b);
if (ta != tb)
return false;
#endif
}
value_t devs_value_encode_throw_jmp_pc(int pc, unsigned lev) {
JD_ASSERT(lev <= DEVS_SPECIAL_THROW_JMP_LEVEL_MAX);
JD_ASSERT(pc && pc <= DEVS_SPECIAL_THROW_JMP_PC_MAX);
uint32_t hv = (pc << DEVS_SPECIAL_THROW_JMP_LEVEL_SHIFT) | lev;
return devs_value_from_handle(DEVS_HANDLE_TYPE_SPECIAL, DEVS_SPECIAL_THROW_JMP_OFF + hv);
}