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duktape/src-input/duk_hthread_builtins.c

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/*
* Initialize built-in objects. Current thread must have a valstack
* and initialization errors may longjmp, so a setjmp() catch point
* must exist.
*/
#include "duk_internal.h"
/*
* Encoding constants, must match genbuiltins.py
*/
#define DUK__PROP_FLAGS_BITS 3
#define DUK__LENGTH_PROP_BITS 3
#define DUK__NARGS_BITS 3
#define DUK__PROP_TYPE_BITS 3
#define DUK__NARGS_VARARGS_MARKER 0x07
#define DUK__PROP_TYPE_DOUBLE 0
#define DUK__PROP_TYPE_STRING 1
#define DUK__PROP_TYPE_STRIDX 2
#define DUK__PROP_TYPE_BUILTIN 3
#define DUK__PROP_TYPE_UNDEFINED 4
#define DUK__PROP_TYPE_BOOLEAN_TRUE 5
#define DUK__PROP_TYPE_BOOLEAN_FALSE 6
#define DUK__PROP_TYPE_ACCESSOR 7
/*
* Create built-in objects by parsing an init bitstream generated
* by genbuiltins.py.
*/
#if defined(DUK_USE_ROM_OBJECTS)
#if defined(DUK_USE_ROM_GLOBAL_CLONE) || defined(DUK_USE_ROM_GLOBAL_INHERIT)
DUK_LOCAL void duk__duplicate_ram_global_object(duk_hthread *thr) {
duk_hobject *h_global;
#if defined(DUK_USE_ROM_GLOBAL_CLONE)
duk_hobject *h_oldglobal;
duk_uint8_t *props;
duk_size_t alloc_size;
#endif
duk_hobject *h_objenv;
/* XXX: refactor into internal helper, duk_clone_hobject() */
#if defined(DUK_USE_ROM_GLOBAL_INHERIT)
/* Inherit from ROM-based global object: less RAM usage, less transparent. */
h_global = duk_push_object_helper(thr,
DUK_HOBJECT_FLAG_EXTENSIBLE | DUK_HOBJECT_FLAG_FASTREFS |
DUK_HEAPHDR_HTYPE_AS_FLAGS(DUK_HTYPE_GLOBAL),
DUK_BIDX_GLOBAL);
DUK_ASSERT(h_global != NULL);
#elif defined(DUK_USE_ROM_GLOBAL_CLONE)
/* Clone the properties of the ROM-based global object to create a
* fully RAM-based global object. Uses more memory than the inherit
* model but more compliant.
*/
h_global = duk_push_object_helper(thr,
DUK_HOBJECT_FLAG_EXTENSIBLE | DUK_HOBJECT_FLAG_FASTREFS |
DUK_HEAPHDR_HTYPE_AS_FLAGS(DUK_HTYPE_GLOBAL),
DUK_BIDX_OBJECT_PROTOTYPE);
DUK_ASSERT(h_global != NULL);
h_oldglobal = thr->builtins[DUK_BIDX_GLOBAL];
DUK_ASSERT(h_oldglobal != NULL);
/* Copy the property table verbatim; this handles attributes etc.
* For ROM objects it's not necessary (or possible) to update
* refcounts so leave them as is.
*/
alloc_size = duk_hobject_get_ebytes(h_oldglobal);
DUK_ASSERT(alloc_size > 0);
props = DUK_ALLOC_CHECKED(thr, alloc_size);
DUK_ASSERT(props != NULL);
DUK_ASSERT(duk_hobject_get_strprops(thr->heap, h_oldglobal) != NULL);
duk_memcpy((void *) props, (const void *) duk_hobject_get_strprops(thr->heap, h_oldglobal), alloc_size);
/* XXX: keep property attributes or tweak them here?
* Properties will now be non-configurable even when they're
* normally configurable for the global object.
*/
DUK_ASSERT(duk_hobject_get_strprops(thr->heap, h_global) == NULL);
duk_hobject_set_strprops(thr->heap, h_global, props);
duk_hobject_set_esize(h_global, duk_hobject_get_esize(h_oldglobal));
duk_hobject_set_enext(h_global, duk_hobject_get_enext(h_oldglobal));
#else
#error internal error in config defines
#endif
duk_hobject_compact_object(thr, h_global);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
DUK_ASSERT(
!DUK_HEAPHDR_NEEDS_REFCOUNT_UPDATE((duk_heaphdr *) thr->builtins[DUK_BIDX_GLOBAL])); /* no need to decref: ROM object */
thr->builtins[DUK_BIDX_GLOBAL] = h_global;
DUK_HOBJECT_INCREF(thr, h_global);
DUK_D(DUK_DPRINT("duplicated global object: %!O", h_global));
/* Create a fresh object environment for the global scope. This is
* needed so that the global scope points to the newly created RAM-based
* global object.
*/
h_objenv =
(duk_hobject *) duk_hobjenv_alloc(thr, DUK_HOBJECT_FLAG_EXTENSIBLE | DUK_HEAPHDR_HTYPE_AS_FLAGS(DUK_HTYPE_OBJENV));
DUK_ASSERT(h_objenv != NULL);
DUK_ASSERT(duk_hobject_get_proto_raw(thr->heap, h_objenv) == NULL);
duk_push_hobject(thr, h_objenv);
DUK_ASSERT(h_global != NULL);
((duk_hobjenv *) h_objenv)->target = h_global;
DUK_HOBJECT_INCREF(thr, h_global);
DUK_ASSERT(((duk_hobjenv *) h_objenv)->has_this == 0);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL_ENV] != NULL);
DUK_ASSERT(!DUK_HEAPHDR_NEEDS_REFCOUNT_UPDATE(
(duk_heaphdr *) thr->builtins[DUK_BIDX_GLOBAL_ENV])); /* no need to decref: ROM object */
thr->builtins[DUK_BIDX_GLOBAL_ENV] = h_objenv;
DUK_HOBJECT_INCREF(thr, h_objenv);
DUK_D(DUK_DPRINT("duplicated global env: %!O", h_objenv));
DUK_HOBJENV_ASSERT_VALID((duk_hobjenv *) h_objenv);
duk_pop_2(thr); /* Pop global object and global env. */
}
#endif /* DUK_USE_ROM_GLOBAL_CLONE || DUK_USE_ROM_GLOBAL_INHERIT */
DUK_INTERNAL void duk_hthread_create_builtin_objects(duk_hthread *thr) {
/* Setup builtins from ROM objects. All heaps/threads will share
* the same readonly objects.
*/
duk_small_uint_t i;
for (i = 0; i < DUK_NUM_BUILTINS; i++) {
duk_hobject *h;
h = (duk_hobject *) DUK_LOSE_CONST(duk_rom_builtins_bidx[i]);
DUK_ASSERT(h != NULL);
thr->builtins[i] = h;
}
#if defined(DUK_USE_ROM_GLOBAL_CLONE) || defined(DUK_USE_ROM_GLOBAL_INHERIT)
/* By default the global object is read-only which is often much
* more of an issue than having read-only built-in objects (like
* RegExp, Date, etc). Use a RAM-based copy of the global object
* and the global environment object for convenience.
*/
duk__duplicate_ram_global_object(thr);
#endif
}
#else /* DUK_USE_ROM_OBJECTS */
DUK_LOCAL void duk__push_stridx(duk_hthread *thr, duk_bitdecoder_ctx *bd) {
duk_small_uint_t n;
n = (duk_small_uint_t) duk_bd_decode_varuint(bd);
DUK_ASSERT_DISABLE(n >= 0); /* unsigned */
DUK_ASSERT(n < DUK_HEAP_NUM_STRINGS);
duk_push_hstring_stridx(thr, n);
}
DUK_LOCAL void duk__push_string(duk_hthread *thr, duk_bitdecoder_ctx *bd) {
/* XXX: built-ins data could provide a maximum length that is
* actually needed; bitpacked max length is now 256 bytes.
*/
duk_uint8_t tmp[DUK_BD_BITPACKED_STRING_MAXLEN];
duk_small_uint_t len;
len = duk_bd_decode_bitpacked_string(bd, tmp);
duk_push_lstring(thr, (const char *) tmp, (duk_size_t) len);
}
DUK_LOCAL void duk__push_stridx_or_string(duk_hthread *thr, duk_bitdecoder_ctx *bd) {
duk_small_uint_t n;
n = (duk_small_uint_t) duk_bd_decode_varuint(bd);
if (n == 0) {
duk__push_string(thr, bd);
} else {
n--;
DUK_ASSERT(n < DUK_HEAP_NUM_STRINGS);
duk_push_hstring_stridx(thr, n);
}
}
DUK_LOCAL void duk__push_double(duk_hthread *thr, duk_bitdecoder_ctx *bd) {
duk_double_union du;
duk_small_uint_t i;
for (i = 0; i < 8; i++) {
/* Encoding endianness must match target memory layout,
* build scripts and genbuiltins.py must ensure this.
*/
du.uc[i] = (duk_uint8_t) duk_bd_decode(bd, 8);
}
duk_push_number(thr, du.d); /* push operation normalizes NaNs */
}
DUK_INTERNAL void duk_hthread_create_builtin_objects(duk_hthread *thr) {
duk_bitdecoder_ctx bd_ctx;
duk_bitdecoder_ctx *bd = &bd_ctx; /* convenience */
duk_hobject *h;
duk_small_uint_t i, j;
DUK_D(DUK_DPRINT("INITBUILTINS BEGIN: DUK_NUM_BUILTINS=%d, DUK_NUM_BUILTINS_ALL=%d",
(int) DUK_NUM_BUILTINS,
(int) DUK_NUM_ALL_BUILTINS));
duk_memzero(&bd_ctx, sizeof(bd_ctx));
bd->data = (const duk_uint8_t *) duk_builtins_data;
bd->length = (duk_size_t) DUK_BUILTINS_DATA_LENGTH;
/*
* First create all built-in bare objects on the empty valstack.
*
* Built-ins in the index range [0,DUK_NUM_BUILTINS-1] have value
* stack indices matching their eventual thr->builtins[] index.
*
* Built-ins in the index range [DUK_NUM_BUILTINS,DUK_NUM_ALL_BUILTINS]
* will exist on the value stack during init but won't be placed
* into thr->builtins[]. These are objects referenced in some way
* from thr->builtins[] roots but which don't need to be indexed by
* Duktape through thr->builtins[] (e.g. user custom objects).
*
* Internal prototypes will be incorrect (NULL) at this stage.
*/
duk_require_stack(thr, DUK_NUM_ALL_BUILTINS);
DUK_DD(DUK_DDPRINT("create empty built-ins"));
DUK_ASSERT_TOP(thr, 0);
for (i = 0; i < DUK_NUM_ALL_BUILTINS; i++) {
duk_small_uint_t htype;
duk_small_int_t len = -1; /* must be signed */
htype = (duk_small_uint_t) duk_bd_decode_varuint(bd);
len = (duk_small_int_t) duk_bd_decode_flagged_signed(bd, DUK__LENGTH_PROP_BITS, (duk_int32_t) -1 /*def_value*/);
if (htype == DUK_HTYPE_NATFUNC) {
duk_small_uint_t natidx;
duk_small_int_t c_nargs; /* must hold DUK_VARARGS */
duk_c_function c_func;
duk_int16_t magic;
DUK_DDD(DUK_DDDPRINT("len=%ld", (long) len));
DUK_ASSERT(len >= 0);
natidx = (duk_small_uint_t) duk_bd_decode_varuint(bd);
DUK_ASSERT(natidx != 0);
c_func = duk_bi_native_functions[natidx];
DUK_ASSERT(c_func != NULL);
c_nargs = (duk_small_int_t) duk_bd_decode_flagged_signed(bd, DUK__NARGS_BITS, len /*def_value*/);
if (c_nargs == DUK__NARGS_VARARGS_MARKER) {
c_nargs = DUK_VARARGS;
}
/* XXX: set magic directly here? (it could share the c_nargs arg) */
(void) duk_push_c_function_builtin(thr, c_func, c_nargs);
h = duk_known_hobject(thr, -1);
/* Currently all built-in native functions are strict.
* duk_push_c_function() now sets strict flag, so
* assert for it.
*/
DUK_ASSERT(DUK_HOBJECT_HAS_STRICT(h));
/* XXX: function properties */
duk__push_stridx_or_string(thr, bd);
#if defined(DUK_USE_FUNC_NAME_PROPERTY)
duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_C);
#else
duk_pop(thr); /* Not very ideal but good enough for now. */
#endif
/* Almost all global level Function objects are constructable
* but not all: Function.prototype is a non-constructable,
* callable Function.
*/
if (duk_bd_decode_flag(bd)) {
DUK_ASSERT(DUK_HOBJECT_HAS_CONSTRUCTABLE(h));
} else {
DUK_HOBJECT_CLEAR_CONSTRUCTABLE(h);
}
/* Cast converts magic to 16-bit signed value */
magic = (duk_int16_t) duk_bd_decode_varuint(bd);
((duk_hnatfunc *) h)->magic = magic;
} else if (htype == DUK_HTYPE_ARRAY) {
duk_push_array(thr);
} else if (htype == DUK_HTYPE_OBJENV) {
duk_hobjenv *env;
duk_hobject *global;
DUK_ASSERT(i == DUK_BIDX_GLOBAL_ENV);
DUK_ASSERT(DUK_BIDX_GLOBAL_ENV > DUK_BIDX_GLOBAL);
env = duk_hobjenv_alloc(thr, DUK_HOBJECT_FLAG_EXTENSIBLE | DUK_HEAPHDR_HTYPE_AS_FLAGS(DUK_HTYPE_OBJENV));
DUK_ASSERT(env->target == NULL);
duk_push_hobject(thr, (duk_hobject *) env);
global = duk_known_hobject(thr, DUK_BIDX_GLOBAL);
DUK_ASSERT(global != NULL);
env->target = global;
DUK_HOBJECT_INCREF(thr, global);
DUK_ASSERT(env->has_this == 0);
DUK_HOBJENV_ASSERT_VALID(env);
} else {
DUK_ASSERT(htype != DUK_HTYPE_DECENV);
(void) duk_push_object_helper(thr,
DUK_HOBJECT_FLAG_FASTREFS | DUK_HOBJECT_FLAG_EXTENSIBLE |
DUK_HEAPHDR_HTYPE_AS_FLAGS(htype),
-1);
}
h = duk_known_hobject(thr, -1);
DUK_ASSERT(DUK_HOBJECT_GET_HTYPE(h) == htype);
if (i < DUK_NUM_BUILTINS) {
thr->builtins[i] = h;
DUK_HOBJECT_INCREF(thr, &h->hdr);
}
if (len >= 0) {
/* In ES2015+ built-in function object .length property
* has property attributes C (configurable only):
* http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-standard-built-in-objects
*
* Array.prototype remains an Array instance in ES2015+
* and its length has attributes W (writable only).
* Because .length is now virtual for duk_harray, it is
* not encoded explicitly in init data.
*/
DUK_ASSERT(htype != DUK_HTYPE_ARRAY); /* .length is virtual */
duk_push_int(thr, len);
duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_C);
}
/* enable exotic behaviors last */
if (htype == DUK_HTYPE_ARRAY) {
DUK_ASSERT(DUK_HOBJECT_HAS_EXOTIC_ARRAY(h)); /* set by duk_push_array() */
}
if (htype == DUK_HTYPE_STRING_OBJECT) {
DUK_HOBJECT_SET_EXOTIC_STRINGOBJ(h);
}
/* some assertions */
DUK_ASSERT(DUK_HOBJECT_HAS_EXTENSIBLE(h));
/* DUK_HOBJECT_FLAG_CONSTRUCTABLE varies */
DUK_ASSERT(!DUK_HOBJECT_HAS_BOUNDFUNC(h));
DUK_ASSERT(!DUK_HOBJECT_HAS_COMPFUNC(h));
/* DUK_HOBJECT_FLAG_NATFUNC varies */
DUK_ASSERT(!DUK_HOBJECT_IS_THREAD(h));
DUK_ASSERT(!DUK_HOBJECT_IS_PROXY(h));
/* DUK_HOBJECT_FLAG_STRICT varies */
DUK_ASSERT(!DUK_HOBJECT_HAS_NATFUNC(h) || /* all native functions have NEWENV */
DUK_HOBJECT_HAS_NEWENV(h));
DUK_ASSERT(!DUK_HOBJECT_HAS_NAMEBINDING(h));
DUK_ASSERT(!DUK_HOBJECT_HAS_CREATEARGS(h));
/* DUK_HOBJECT_FLAG_EXOTIC_ARRAY varies */
/* DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ varies */
DUK_ASSERT(!DUK_HOBJECT_HAS_EXOTIC_ARGUMENTS(h));
DUK_DDD(DUK_DDDPRINT("created built-in %ld, htype=%ld, length=%ld", (long) i, (long) htype, (long) len));
}
/*
* Then decode the builtins init data (see genbuiltins.py) to
* init objects. Internal prototypes are set at this stage,
* with thr->builtins[] populated.
*/
DUK_DD(DUK_DDPRINT("initialize built-in object properties"));
for (i = 0; i < DUK_NUM_ALL_BUILTINS; i++) {
duk_small_uint_t t;
duk_small_uint_t num;
DUK_DDD(DUK_DDDPRINT("initializing built-in object at index %ld", (long) i));
h = duk_known_hobject(thr, (duk_idx_t) i);
t = (duk_small_uint_t) duk_bd_decode_varuint(bd);
if (t > 0) {
t--;
DUK_DDD(DUK_DDDPRINT("set internal prototype: built-in %ld", (long) t));
duk_hobject_set_proto_raw_updref(thr, h, duk_known_hobject(thr, (duk_idx_t) t));
} else if (DUK_HOBJECT_IS_NATFUNC(h)) {
/* Standard native built-ins cannot inherit from
* %NativeFunctionPrototype%, they are required to
* inherit from Function.prototype directly.
*/
DUK_ASSERT(thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE] != NULL);
duk_hobject_set_proto_raw_updref(thr, h, thr->builtins[DUK_BIDX_FUNCTION_PROTOTYPE]);
}
t = (duk_small_uint_t) duk_bd_decode_varuint(bd);
if (t > 0) {
/* 'prototype' property for all built-in objects (which have it) has attributes:
* [[Writable]] = false,
* [[Enumerable]] = false,
* [[Configurable]] = false
*/
t--;
DUK_DDD(DUK_DDDPRINT("set external prototype: built-in %ld", (long) t));
duk_dup(thr, (duk_idx_t) t);
duk_xdef_prop_stridx(thr, (duk_idx_t) i, DUK_STRIDX_PROTOTYPE, DUK_PROPDESC_FLAGS_NONE);
}
t = (duk_small_uint_t) duk_bd_decode_varuint(bd);
if (t > 0) {
/* 'constructor' property for all built-in objects (which have it) has attributes:
* [[Writable]] = true,
* [[Enumerable]] = false,
* [[Configurable]] = true
*/
t--;
DUK_DDD(DUK_DDDPRINT("set external constructor: built-in %ld", (long) t));
duk_dup(thr, (duk_idx_t) t);
duk_xdef_prop_stridx(thr, (duk_idx_t) i, DUK_STRIDX_CONSTRUCTOR, DUK_PROPDESC_FLAGS_WC);
}
/* normal valued properties */
num = (duk_small_uint_t) duk_bd_decode_varuint(bd);
DUK_DDD(DUK_DDDPRINT("built-in object %ld, %ld normal valued properties", (long) i, (long) num));
for (j = 0; j < num; j++) {
duk_small_uint_t defprop_flags;
duk__push_stridx_or_string(thr, bd);
/*
* Property attribute defaults are defined in E5 Section 15 (first
* few pages); there is a default for all properties and a special
* default for 'length' properties. Variation from the defaults is
* signaled using a single flag bit in the bitstream.
*/
defprop_flags = (duk_small_uint_t) duk_bd_decode_flagged(bd,
DUK__PROP_FLAGS_BITS,
(duk_uint32_t) DUK_PROPDESC_FLAGS_WC);
defprop_flags |= DUK_DEFPROP_FORCE | DUK_DEFPROP_HAVE_VALUE | DUK_DEFPROP_HAVE_WRITABLE |
DUK_DEFPROP_HAVE_ENUMERABLE |
DUK_DEFPROP_HAVE_CONFIGURABLE; /* Defaults for data properties. */
/* The writable, enumerable, configurable flags in prop_flags
* match both duk_def_prop() and internal property flags.
*/
DUK_ASSERT(DUK_PROPDESC_FLAG_WRITABLE == DUK_DEFPROP_WRITABLE);
DUK_ASSERT(DUK_PROPDESC_FLAG_ENUMERABLE == DUK_DEFPROP_ENUMERABLE);
DUK_ASSERT(DUK_PROPDESC_FLAG_CONFIGURABLE == DUK_DEFPROP_CONFIGURABLE);
t = (duk_small_uint_t) duk_bd_decode(bd, DUK__PROP_TYPE_BITS);
DUK_DDD(DUK_DDDPRINT("built-in %ld, normal-valued property %ld, key %!T, flags 0x%02lx, type %ld",
(long) i,
(long) j,
duk_get_tval(thr, -1),
(unsigned long) defprop_flags,
(long) t));
switch (t) {
case DUK__PROP_TYPE_DOUBLE: {
duk__push_double(thr, bd);
break;
}
case DUK__PROP_TYPE_STRING: {
duk__push_string(thr, bd);
break;
}
case DUK__PROP_TYPE_STRIDX: {
duk__push_stridx(thr, bd);
break;
}
case DUK__PROP_TYPE_BUILTIN: {
duk_small_uint_t bidx;
bidx = (duk_small_uint_t) duk_bd_decode_varuint(bd);
duk_dup(thr, (duk_idx_t) bidx);
break;
}
case DUK__PROP_TYPE_UNDEFINED: {
duk_push_undefined(thr);
break;
}
case DUK__PROP_TYPE_BOOLEAN_TRUE: {
duk_push_true(thr);
break;
}
case DUK__PROP_TYPE_BOOLEAN_FALSE: {
duk_push_false(thr);
break;
}
case DUK__PROP_TYPE_ACCESSOR: {
duk_small_uint_t natidx_getter = (duk_small_uint_t) duk_bd_decode_varuint(bd);
duk_small_uint_t natidx_setter = (duk_small_uint_t) duk_bd_decode_varuint(bd);
duk_small_uint_t accessor_magic = (duk_small_uint_t) duk_bd_decode_varuint(bd);
duk_c_function c_func_getter;
duk_c_function c_func_setter;
DUK_DDD(DUK_DDDPRINT(
"built-in accessor property: objidx=%ld, key=%!T, getteridx=%ld, setteridx=%ld, flags=0x%04lx",
(long) i,
duk_get_tval(thr, -1),
(long) natidx_getter,
(long) natidx_setter,
(unsigned long) defprop_flags));
c_func_getter = duk_bi_native_functions[natidx_getter];
if (c_func_getter != NULL) {
/* Deal with Function.prototype .caller and .arguments, ensure
* all share the same thrower function instance.
*/
if (c_func_getter == duk_bi_type_error_thrower) {
duk_dup(thr, DUK_BIDX_TYPE_ERROR_THROWER);
} else {
duk_push_c_function_builtin_noconstruct(thr, c_func_getter, 0); /* always 0 args */
duk_set_magic(thr, -1, (duk_int_t) accessor_magic);
}
defprop_flags |= DUK_DEFPROP_HAVE_GETTER;
}
c_func_setter = duk_bi_native_functions[natidx_setter];
if (c_func_setter != NULL) {
/* Deal with Function.prototype .caller and .arguments, ensure
* all share the same thrower function instance.
*/
if (c_func_setter == duk_bi_type_error_thrower) {
duk_dup(thr, DUK_BIDX_TYPE_ERROR_THROWER);
} else {
duk_push_c_function_builtin_noconstruct(thr, c_func_setter, 1); /* always 1 arg */
duk_set_magic(thr, -1, (duk_int_t) accessor_magic);
}
defprop_flags |= DUK_DEFPROP_HAVE_SETTER;
}
/* Writable flag doesn't make sense for an accessor. */
DUK_ASSERT((defprop_flags & DUK_PROPDESC_FLAG_WRITABLE) == 0); /* genbuiltins.py ensures */
defprop_flags &= ~(DUK_DEFPROP_HAVE_VALUE | DUK_DEFPROP_HAVE_WRITABLE);
defprop_flags |= DUK_DEFPROP_HAVE_ENUMERABLE | DUK_DEFPROP_HAVE_CONFIGURABLE;
break;
}
default: {
/* exhaustive */
DUK_UNREACHABLE();
}
}
duk_def_prop(thr, (duk_idx_t) i, defprop_flags);
DUK_ASSERT_TOP(thr, DUK_NUM_ALL_BUILTINS);
}
/* native function properties */
num = (duk_small_uint_t) duk_bd_decode_varuint(bd);
DUK_DDD(DUK_DDDPRINT("built-in object %ld, %ld function valued properties", (long) i, (long) num));
for (j = 0; j < num; j++) {
duk_hstring *h_key;
duk_small_uint_t natidx;
duk_int_t c_nargs; /* must hold DUK_VARARGS */
duk_small_uint_t c_length;
duk_int16_t magic;
duk_c_function c_func;
duk_hnatfunc *h_func;
#if defined(DUK_USE_LIGHTFUNC_BUILTINS)
duk_small_int_t lightfunc_eligible;
#endif
duk_small_uint_t defprop_flags;
duk__push_stridx_or_string(thr, bd);
h_key = duk_known_hstring_m1(thr);
DUK_UNREF(h_key);
natidx = (duk_small_uint_t) duk_bd_decode_varuint(bd);
c_length = (duk_small_uint_t) duk_bd_decode(bd, DUK__LENGTH_PROP_BITS);
c_nargs = (duk_int_t) duk_bd_decode_flagged(bd, DUK__NARGS_BITS, (duk_uint32_t) c_length /*def_value*/);
if (c_nargs == DUK__NARGS_VARARGS_MARKER) {
c_nargs = DUK_VARARGS;
}
c_func = duk_bi_native_functions[natidx];
DUK_DDD(
DUK_DDDPRINT("built-in %ld, function-valued property %ld, key %!O, natidx %ld, length %ld, nargs %ld",
(long) i,
(long) j,
(duk_heaphdr *) h_key,
(long) natidx,
(long) c_length,
(c_nargs == DUK_VARARGS ? (long) -1 : (long) c_nargs)));
/* Cast converts magic to 16-bit signed value */
magic = (duk_int16_t) duk_bd_decode_varuint(bd);
#if defined(DUK_USE_LIGHTFUNC_BUILTINS)
lightfunc_eligible =
((c_nargs >= DUK_LFUNC_NARGS_MIN && c_nargs <= DUK_LFUNC_NARGS_MAX) || (c_nargs == DUK_VARARGS)) &&
(c_length <= DUK_LFUNC_LENGTH_MAX) && (magic >= DUK_LFUNC_MAGIC_MIN && magic <= DUK_LFUNC_MAGIC_MAX);
/* These functions have trouble working as lightfuncs.
* Some of them have specific asserts and some may have
* additional properties (e.g. 'require.id' may be written).
*/
if (c_func == duk_bi_global_object_eval) {
lightfunc_eligible = 0;
}
#if defined(DUK_USE_COROUTINE_SUPPORT)
if (c_func == duk_bi_thread_yield || c_func == duk_bi_thread_resume) {
lightfunc_eligible = 0;
}
#endif
if (c_func == duk_bi_function_prototype_call || c_func == duk_bi_function_prototype_apply ||
c_func == duk_bi_reflect_apply || c_func == duk_bi_reflect_construct) {
lightfunc_eligible = 0;
}
if (lightfunc_eligible) {
duk_tval tv_lfunc;
duk_small_uint_t lf_nargs =
(duk_small_uint_t) (c_nargs == DUK_VARARGS ? DUK_LFUNC_NARGS_VARARGS : c_nargs);
duk_small_uint_t lf_flags = DUK_LFUNC_FLAGS_PACK(magic, c_length, lf_nargs);
DUK_TVAL_SET_LIGHTFUNC(&tv_lfunc, c_func, lf_flags);
duk_push_tval(thr, &tv_lfunc);
DUK_D(DUK_DPRINT("built-in function eligible as light function: i=%d, j=%d c_length=%ld, "
"c_nargs=%ld, magic=%ld -> %!iT",
(int) i,
(int) j,
(long) c_length,
(long) c_nargs,
(long) magic,
duk_get_tval(thr, -1)));
goto lightfunc_skip;
}
DUK_D(DUK_DPRINT(
"built-in function NOT ELIGIBLE as light function: i=%d, j=%d c_length=%ld, c_nargs=%ld, magic=%ld",
(int) i,
(int) j,
(long) c_length,
(long) c_nargs,
(long) magic));
#endif /* DUK_USE_LIGHTFUNC_BUILTINS */
/* [ (builtin objects) name ] */
duk_push_c_function_builtin_noconstruct(thr, c_func, c_nargs);
h_func = duk_known_hnatfunc(thr, -1);
DUK_UNREF(h_func);
/* XXX: add into init data? */
/* Special call handling, not described in init data. */
if (c_func == duk_bi_global_object_eval || c_func == duk_bi_function_prototype_call ||
c_func == duk_bi_function_prototype_apply || c_func == duk_bi_reflect_apply ||
c_func == duk_bi_reflect_construct) {
DUK_HOBJECT_SET_SPECIAL_CALL((duk_hobject *) h_func);
}
/* Currently all built-in native functions are strict.
* This doesn't matter for many functions, but e.g.
* String.prototype.charAt (and other string functions)
* rely on being strict so that their 'this' binding is
* not automatically coerced.
*/
DUK_HOBJECT_SET_STRICT((duk_hobject *) h_func);
/* No built-in functions are constructable except the top
* level ones (Number, etc).
*/
DUK_ASSERT(!DUK_HOBJECT_HAS_CONSTRUCTABLE((duk_hobject *) h_func));
/* XXX: any way to avoid decoding magic bit; there are quite
* many function properties and relatively few with magic values.
*/
h_func->magic = magic;
/* [ (builtin objects) name func ] */
duk_push_uint(thr, c_length);
duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_C);
duk_dup_m2(thr);
duk_xdef_prop_stridx_short(thr, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_C);
/* XXX: other properties of function instances; 'arguments', 'caller'. */
DUK_DD(DUK_DDPRINT("built-in object %ld, function property %ld -> %!T",
(long) i,
(long) j,
(duk_tval *) duk_get_tval(thr, -1)));
/* [ (builtin objects) name func ] */
/*
* The default property attributes are correct for all
* function valued properties of built-in objects now.
*/
#if defined(DUK_USE_LIGHTFUNC_BUILTINS)
lightfunc_skip:
#endif
defprop_flags = (duk_small_uint_t) duk_bd_decode_flagged(bd,
DUK__PROP_FLAGS_BITS,
(duk_uint32_t) DUK_PROPDESC_FLAGS_WC);
defprop_flags |= DUK_DEFPROP_FORCE | DUK_DEFPROP_HAVE_VALUE | DUK_DEFPROP_HAVE_WRITABLE |
DUK_DEFPROP_HAVE_ENUMERABLE | DUK_DEFPROP_HAVE_CONFIGURABLE;
DUK_ASSERT(DUK_PROPDESC_FLAG_WRITABLE == DUK_DEFPROP_WRITABLE);
DUK_ASSERT(DUK_PROPDESC_FLAG_ENUMERABLE == DUK_DEFPROP_ENUMERABLE);
DUK_ASSERT(DUK_PROPDESC_FLAG_CONFIGURABLE == DUK_DEFPROP_CONFIGURABLE);
duk_def_prop(thr, (duk_idx_t) i, defprop_flags);
/* [ (builtin objects) ] */
}
}
/*
* Special post-tweaks, for cases not covered by the init data format.
*
* - Set Date.prototype.toGMTString to Date.prototype.toUTCString.
* toGMTString is required to have the same Function object as
* toUTCString in E5 Section B.2.6. Note that while Smjs respects
* this, V8 does not (the Function objects are distinct).
*
* - Make DoubleError non-extensible.
*
* - Add info about most important effective compile options to Duktape.
*
* - Possibly remove some properties (values or methods) which are not
* desirable with current feature options but are not currently
* conditional in init data.
*/
#if defined(DUK_USE_DATE_BUILTIN)
duk_get_prop_stridx_short(thr, DUK_BIDX_DATE_PROTOTYPE, DUK_STRIDX_TO_UTC_STRING);
duk_xdef_prop_stridx_short(thr, DUK_BIDX_DATE_PROTOTYPE, DUK_STRIDX_TO_GMT_STRING, DUK_PROPDESC_FLAGS_WC);
#endif
h = duk_known_hobject(thr, DUK_BIDX_DOUBLE_ERROR);
DUK_HOBJECT_CLEAR_EXTENSIBLE(h);
#if !defined(DUK_USE_ES6_OBJECT_PROTO_PROPERTY)
DUK_DD(DUK_DDPRINT("delete Object.prototype.__proto__ built-in which is not enabled in features"));
(void) duk_prop_delete_obj_str(thr,
thr->builtins[DUK_BIDX_OBJECT_PROTOTYPE],
DUK_HTHREAD_STRING___PROTO__(thr),
DUK_DELPROP_FLAG_THROW);
#endif
#if !defined(DUK_USE_ES6_OBJECT_SETPROTOTYPEOF)
DUK_DD(DUK_DDPRINT("delete Object.setPrototypeOf built-in which is not enabled in features"));
(void) duk_prop_delete_obj_str(thr,
thr->builtins[DUK_BIDX_OBJECT_CONSTRUCTOR],
DUK_HTHREAD_STRING_SET_PROTOTYPE_OF(thr),
DUK_DELPROP_FLAG_THROW);
#endif
/* XXX: relocate */
duk_push_string(thr,
/* Endianness indicator */
#if defined(DUK_USE_INTEGER_LE)
"l"
#elif defined(DUK_USE_INTEGER_BE)
"b"
#elif defined(DUK_USE_INTEGER_ME) /* integer mixed endian not really used now */
"m"
#else
"?"
#endif
#if defined(DUK_USE_DOUBLE_LE)
"l"
#elif defined(DUK_USE_DOUBLE_BE)
"b"
#elif defined(DUK_USE_DOUBLE_ME)
"m"
#else
"?"
#endif
" "
/* Packed or unpacked tval */
#if defined(DUK_USE_PACKED_TVAL)
"p"
#else
"u"
#endif
#if defined(DUK_USE_FASTINT)
"f"
#endif
" "
/* Low memory/performance options */
#if defined(DUK_USE_STRTAB_PTRCOMP)
"s"
#endif
#if !defined(DUK_USE_HEAPPTR16) && !defined(DUK_DATAPTR16) && !defined(DUK_FUNCPTR16)
"n"
#endif
#if defined(DUK_USE_HEAPPTR16)
"h"
#endif
#if defined(DUK_USE_DATAPTR16)
"d"
#endif
#if defined(DUK_USE_FUNCPTR16)
"f"
#endif
#if defined(DUK_USE_REFCOUNT16)
"R"
#endif
#if defined(DUK_USE_STRHASH16)
"H"
#endif
#if defined(DUK_USE_STRLEN16)
"S"
#endif
#if defined(DUK_USE_BUFLEN16)
"B"
#endif
#if defined(DUK_USE_OBJSIZES16)
"O"
#endif
#if defined(DUK_USE_LIGHTFUNC_BUILTINS)
"L"
#endif
#if defined(DUK_USE_ROM_STRINGS) || defined(DUK_USE_ROM_OBJECTS)
/* XXX: This won't be shown in practice now
* because this code is not run when builtins
* are in ROM.
*/
"Z"
#endif
#if defined(DUK_USE_LITCACHE_SIZE)
"l"
#endif
" "
/* Alignment guarantee */
#if (DUK_USE_ALIGN_BY == 4)
"a4"
#elif (DUK_USE_ALIGN_BY == 8)
"a8"
#elif (DUK_USE_ALIGN_BY == 1)
"a1"
#else
#error invalid DUK_USE_ALIGN_BY
#endif
" "
/* Architecture, OS, and compiler strings */
DUK_USE_ARCH_STRING " " DUK_USE_OS_STRING " " DUK_USE_COMPILER_STRING);
duk_xdef_prop_stridx_short(thr, DUK_BIDX_DUKTAPE, DUK_STRIDX_ENV, DUK_PROPDESC_FLAGS_WC);
/*
* Since built-ins are not often extended, compact them.
*/
DUK_DD(DUK_DDPRINT("compact built-ins"));
for (i = 0; i < DUK_NUM_ALL_BUILTINS; i++) {
duk_hobject_compact_object(thr, duk_known_hobject(thr, (duk_idx_t) i));
}
DUK_D(DUK_DPRINT("INITBUILTINS END"));
#if defined(DUK_USE_DEBUG_LEVEL) && (DUK_USE_DEBUG_LEVEL >= 1)
for (i = 0; i < DUK_NUM_ALL_BUILTINS; i++) {
DUK_DD(DUK_DDPRINT("built-in object %ld after initialization and compacting: %!@iO",
(long) i,
(duk_heaphdr *) duk_require_hobject(thr, (duk_idx_t) i)));
}
#endif
/*
* Pop built-ins from stack: they are now INCREF'd and
* reachable from the builtins[] array or indirectly
* through builtins[].
*/
duk_set_top(thr, 0);
DUK_ASSERT_TOP(thr, 0);
}
#endif /* DUK_USE_ROM_OBJECTS */
DUK_INTERNAL void duk_hthread_copy_builtin_objects(duk_hthread *thr_from, duk_hthread *thr_to) {
duk_small_uint_t i;
for (i = 0; i < DUK_NUM_BUILTINS; i++) {
thr_to->builtins[i] = thr_from->builtins[i];
DUK_HOBJECT_INCREF_ALLOWNULL(thr_to, thr_to->builtins[i]); /* side effect free */
}
}