Exemplo n.º 1
0
void duk_hthread_create_builtin_objects(duk_hthread *thr) {
	duk_context *ctx = (duk_context *) 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_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.
	 *  During init, their indices will correspond to built-in indices.
	 *
	 *  Built-ins will be reachable from both valstack and thr->builtins.
	 */

	/* XXX: there is no need to resize valstack because builtin count
	 * is much less than the default space; assert for it.
	 */

	DUK_DD(DUK_DDPRINT("create empty built-ins"));
	DUK_ASSERT_TOP(ctx, 0);
	for (i = 0; i < DUK_NUM_BUILTINS; i++) {
		duk_small_uint_t class_num;
		duk_small_int_t len = -1;  /* must be signed */

		class_num = (duk_small_uint_t) duk_bd_decode(bd, DUK__CLASS_BITS);
		len = (duk_small_int_t) duk_bd_decode_flagged(bd, DUK__LENGTH_PROP_BITS, (duk_int32_t) -1 /*def_value*/);

		if (class_num == DUK_HOBJECT_CLASS_FUNCTION) {
			duk_small_uint_t natidx;
			duk_small_uint_t stridx;
			duk_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(bd, DUK__NATIDX_BITS);
			stridx = (duk_small_uint_t) duk_bd_decode(bd, DUK__STRIDX_BITS);
			c_func = duk_bi_native_functions[natidx];

			c_nargs = (duk_small_uint_t) duk_bd_decode_flagged(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) */
			duk_push_c_function_noexotic(ctx, c_func, c_nargs);

			h = duk_require_hobject(ctx, -1);
			DUK_ASSERT(h != NULL);

			/* 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_hstring_stridx(ctx, stridx);
			duk_def_prop_stridx(ctx, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_NONE);

			/* 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_flagged(bd, DUK__MAGIC_BITS, 0 /*def_value*/);
			((duk_hnativefunction *) h)->magic = magic;
		} else {
			/* XXX: ARRAY_PART for Array prototype? */

			duk_push_object_helper(ctx,
			                       DUK_HOBJECT_FLAG_EXTENSIBLE,
			                       -1);  /* no prototype or class yet */

			h = duk_require_hobject(ctx, -1);
			DUK_ASSERT(h != NULL);
		}

		DUK_HOBJECT_SET_CLASS_NUMBER(h, class_num);

		thr->builtins[i] = h;
		DUK_HOBJECT_INCREF(thr, &h->hdr);

		if (len >= 0) {
			/*
			 *  For top-level objects, 'length' property has the following
			 *  default attributes: non-writable, non-enumerable, non-configurable
			 *  (E5 Section 15).
			 *
			 *  However, 'length' property for Array.prototype has attributes
			 *  expected of an Array instance which are different: writable,
			 *  non-enumerable, non-configurable (E5 Section 15.4.5.2).
			 *
			 *  This is currently determined implicitly based on class; there are
			 *  no attribute flags in the init data.
			 */

			duk_push_int(ctx, len);
			duk_def_prop_stridx(ctx,
			                    -2,
			                    DUK_STRIDX_LENGTH,
			                    (class_num == DUK_HOBJECT_CLASS_ARRAY ?  /* only Array.prototype matches */
			                     DUK_PROPDESC_FLAGS_W : DUK_PROPDESC_FLAGS_NONE));
		}

		/* enable exotic behaviors last */

		if (class_num == DUK_HOBJECT_CLASS_ARRAY) {
			DUK_HOBJECT_SET_EXOTIC_ARRAY(h);
		}
		if (class_num == DUK_HOBJECT_CLASS_STRING) {
			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_BOUND(h));
		DUK_ASSERT(!DUK_HOBJECT_HAS_COMPILEDFUNCTION(h));
		/* DUK_HOBJECT_FLAG_NATIVEFUNCTION varies */
		DUK_ASSERT(!DUK_HOBJECT_HAS_THREAD(h));
		DUK_ASSERT(!DUK_HOBJECT_HAS_ARRAY_PART(h));       /* currently, even for Array.prototype */
		/* DUK_HOBJECT_FLAG_STRICT varies */
		DUK_ASSERT(!DUK_HOBJECT_HAS_NATIVEFUNCTION(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_ASSERT(!DUK_HOBJECT_HAS_ENVRECCLOSED(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, class=%ld, length=%ld", (long) i, (long) class_num, (long) len));
	}

	/*
	 *  Then decode the builtins init data (see genbuiltins.py) to
	 *  init objects
	 */

	DUK_DD(DUK_DDPRINT("initialize built-in object properties"));
	for (i = 0; i < DUK_NUM_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 = thr->builtins[i];

		t = (duk_small_uint_t) duk_bd_decode(bd, DUK__BIDX_BITS);
		if (t != DUK__NO_BIDX_MARKER) {
			DUK_DDD(DUK_DDDPRINT("set internal prototype: built-in %ld", (long) t));
			DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, h, thr->builtins[t]);
		}

		t = (duk_small_uint_t) duk_bd_decode(bd, DUK__BIDX_BITS);
		if (t != DUK__NO_BIDX_MARKER) {
			/* 'prototype' property for all built-in objects (which have it) has attributes:
			 *  [[Writable]] = false,
			 *  [[Enumerable]] = false,
			 *  [[Configurable]] = false
			 */
			DUK_DDD(DUK_DDDPRINT("set external prototype: built-in %ld", (long) t));
			duk_def_prop_stridx_builtin(ctx, i, DUK_STRIDX_PROTOTYPE, t, DUK_PROPDESC_FLAGS_NONE);
		}

		t = (duk_small_uint_t) duk_bd_decode(bd, DUK__BIDX_BITS);
		if (t != DUK__NO_BIDX_MARKER) {
			/* 'constructor' property for all built-in objects (which have it) has attributes:
			 *  [[Writable]] = true,
			 *  [[Enumerable]] = false,	
			 *  [[Configurable]] = true
			 */
			DUK_DDD(DUK_DDDPRINT("set external constructor: built-in %ld", (long) t));
			duk_def_prop_stridx_builtin(ctx, i, DUK_STRIDX_CONSTRUCTOR, t, DUK_PROPDESC_FLAGS_WC);
		}

		/* normal valued properties */
		num = (duk_small_uint_t) duk_bd_decode(bd, DUK__NUM_NORMAL_PROPS_BITS);
		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 stridx;
			duk_small_uint_t prop_flags;

			stridx = (duk_small_uint_t) duk_bd_decode(bd, DUK__STRIDX_BITS);

			/*
			 *  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.
			 */

			if (duk_bd_decode_flag(bd)) {
				prop_flags = (duk_small_uint_t) duk_bd_decode(bd, DUK__PROP_FLAGS_BITS);
			} else {
				if (stridx == DUK_STRIDX_LENGTH) {
					prop_flags = DUK_PROPDESC_FLAGS_NONE;
				} else {
					prop_flags = DUK_PROPDESC_FLAGS_WC;
				}
			}

			t = (duk_small_uint_t) duk_bd_decode(bd, DUK__PROP_TYPE_BITS);

			DUK_DDD(DUK_DDDPRINT("built-in %ld, normal-valued property %ld, stridx %ld, flags 0x%02lx, type %ld",
			                     (long) i, (long) j, (long) stridx, (unsigned long) prop_flags, (long) t));

			switch (t) {
			case DUK__PROP_TYPE_DOUBLE: {
				duk_double_union du;
				duk_small_uint_t k;

				for (k = 0; k < 8; k++) {
					/* Encoding endianness must match target memory layout,
					 * build scripts and genbuiltins.py must ensure this.
					 */
					du.uc[k] = (duk_uint8_t) duk_bd_decode(bd, 8);
				}

				duk_push_number(ctx, du.d);  /* push operation normalizes NaNs */
				break;
			}
			case DUK__PROP_TYPE_STRING: {
				duk_small_uint_t n;
				duk_small_uint_t k;
				duk_uint8_t *p;

				n = (duk_small_uint_t) duk_bd_decode(bd, DUK__STRING_LENGTH_BITS);
				p = (duk_uint8_t *) duk_push_fixed_buffer(ctx, n);
				for (k = 0; k < n; k++) {
					*p++ = (duk_uint8_t) duk_bd_decode(bd, DUK__STRING_CHAR_BITS);
				}

				duk_to_string(ctx, -1);
				break;
			}
			case DUK__PROP_TYPE_STRIDX: {
				duk_small_uint_t n;

				n = (duk_small_uint_t) duk_bd_decode(bd, DUK__STRIDX_BITS);
				DUK_ASSERT_DISABLE(n >= 0);  /* unsigned */
				DUK_ASSERT(n < DUK_HEAP_NUM_STRINGS);
				duk_push_hstring_stridx(ctx, n);
				break;
			}
			case DUK__PROP_TYPE_BUILTIN: {
				duk_small_uint_t bidx;

				bidx = (duk_small_uint_t) duk_bd_decode(bd, DUK__BIDX_BITS);
				DUK_ASSERT(bidx != DUK__NO_BIDX_MARKER);
				duk_dup(ctx, (duk_idx_t) bidx);
				break;
			}
			case DUK__PROP_TYPE_UNDEFINED: {
				duk_push_undefined(ctx);
				break;
			}
			case DUK__PROP_TYPE_BOOLEAN_TRUE: {
				duk_push_true(ctx);
				break;
			}
			case DUK__PROP_TYPE_BOOLEAN_FALSE: {
				duk_push_false(ctx);
				break;
			}
			case DUK__PROP_TYPE_ACCESSOR: {
				duk_small_uint_t natidx_getter = (duk_small_uint_t) duk_bd_decode(bd, DUK__NATIDX_BITS);
				duk_small_uint_t natidx_setter = (duk_small_uint_t) duk_bd_decode(bd, DUK__NATIDX_BITS);
				duk_c_function c_func_getter;
				duk_c_function c_func_setter;

				/* XXX: this is a bit awkward because there is no exposed helper
				 * in the API style, only this internal helper.
				 */
				DUK_DDD(DUK_DDDPRINT("built-in accessor property: objidx=%ld, stridx=%ld, getteridx=%ld, setteridx=%ld, flags=0x%04lx",
				                     (long) i, (long) stridx, (long) natidx_getter, (long) natidx_setter, (unsigned long) prop_flags));

				c_func_getter = duk_bi_native_functions[natidx_getter];
				c_func_setter = duk_bi_native_functions[natidx_setter];
				duk_push_c_function_noconstruct_noexotic(ctx, c_func_getter, 0);  /* always 0 args */
				duk_push_c_function_noconstruct_noexotic(ctx, c_func_setter, 1);  /* always 1 arg */

				/* XXX: magic for getter/setter? */

				prop_flags |= DUK_PROPDESC_FLAG_ACCESSOR;  /* accessor flag not encoded explicitly */
				duk_hobject_define_accessor_internal(thr,
				                                     duk_require_hobject(ctx, i),
				                                     DUK_HTHREAD_GET_STRING(thr, stridx),
				                                     duk_require_hobject(ctx, -2),
				                                     duk_require_hobject(ctx, -1),
				                                     prop_flags);
				duk_pop_2(ctx);  /* getter and setter, now reachable through object */
				goto skip_value;
			}
			default: {
				/* exhaustive */
				DUK_UNREACHABLE();
			}
			}

			DUK_ASSERT((prop_flags & DUK_PROPDESC_FLAG_ACCESSOR) == 0);
			duk_def_prop_stridx(ctx, i, stridx, prop_flags);

		 skip_value:
			continue;  /* avoid empty label at the end of a compound statement */
		}

		/* native function properties */
		num = (duk_small_uint_t) duk_bd_decode(bd, DUK__NUM_FUNC_PROPS_BITS);
		DUK_DDD(DUK_DDDPRINT("built-in object %ld, %ld function valued properties", (long) i, (long) num));
		for (j = 0; j < num; j++) {
			duk_small_uint_t stridx;
			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_hnativefunction *h_func;

			stridx = (duk_small_uint_t) duk_bd_decode(bd, DUK__STRIDX_BITS);
			natidx = (duk_small_uint_t) duk_bd_decode(bd, DUK__NATIDX_BITS);

			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_int32_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, stridx %ld, natidx %ld, length %ld, nargs %ld",
			                     (long) i, (long) j, (long) stridx, (long) natidx, (long) c_length,
			                     (c_nargs == DUK_VARARGS ? (long) -1 : (long) c_nargs)));

			/* [ (builtin objects) ] */

			duk_push_c_function_noconstruct_noexotic(ctx, c_func, c_nargs);
			h_func = duk_require_hnativefunction(ctx, -1);
			DUK_UNREF(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.
			 */
			/* Cast converts magic to 16-bit signed value */
			magic = (duk_int16_t) duk_bd_decode_flagged(bd, DUK__MAGIC_BITS, 0);
			h_func->magic = magic;

			/* [ (builtin objects) func ] */

			duk_push_int(ctx, c_length);
			duk_def_prop_stridx(ctx, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_NONE);

			duk_push_hstring_stridx(ctx, stridx);
			duk_def_prop_stridx(ctx, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_NONE);

			/* 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(ctx, -1)));

			/* [ (builtin objects) func ] */

			/*
			 *  The default property attributes are correct for all
			 *  function valued properties of built-in objects now.
			 */

			duk_def_prop_stridx(ctx, i, stridx, DUK_PROPDESC_FLAGS_WC);

			/* [ (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.
	 */

	duk_get_prop_stridx(ctx, DUK_BIDX_DATE_PROTOTYPE, DUK_STRIDX_TO_UTC_STRING);
	duk_def_prop_stridx(ctx, DUK_BIDX_DATE_PROTOTYPE, DUK_STRIDX_TO_GMT_STRING, DUK_PROPDESC_FLAGS_WC);

	h = duk_require_hobject(ctx, DUK_BIDX_DOUBLE_ERROR);
	DUK_ASSERT(h != NULL);
	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_hobject_delprop_raw(thr, thr->builtins[DUK_BIDX_OBJECT_PROTOTYPE], DUK_HTHREAD_STRING___PROTO__(thr), 1 /*throw_flag*/);
#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_hobject_delprop_raw(thr, thr->builtins[DUK_BIDX_OBJECT_CONSTRUCTOR], DUK_HTHREAD_STRING_SET_PROTOTYPE_OF(thr), 1 /*throw_flag*/);
#endif

	duk_push_string(ctx,
#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
#if defined(DUK_USE_BYTEORDER_FORCED)
			"f"
#endif
	                " "
#if defined(DUK_USE_PACKED_TVAL)
	                "p"
#else
	                "u"
#endif
	                " "
#if defined(DUK_USE_HOBJECT_LAYOUT_1)
			"p1"
#elif defined(DUK_USE_HOBJECT_LAYOUT_2)
			"p2"
#elif defined(DUK_USE_HOBJECT_LAYOUT_3)
			"p3"
#else
			"p?"
#endif
			" "
#if defined(DUK_USE_ALIGN_4)
			"a4"
#elif defined(DUK_USE_ALIGN_8)
			"a8"
#else
			"a1"
#endif
			" "
	                DUK_USE_ARCH_STRING);
	duk_def_prop_stridx(ctx, DUK_BIDX_DUKTAPE, DUK_STRIDX_ENV, DUK_PROPDESC_FLAGS_WC);

	/*
	 *  InitJS code - Ecmascript code evaluated from a built-in source
	 *  which provides e.g. backward compatibility.  User can also provide
	 *  JS code to be evaluated at startup.
	 */

#ifdef DUK_USE_BUILTIN_INITJS
	/* XXX: compression */
	DUK_DD(DUK_DDPRINT("running built-in initjs"));
	duk_eval_string(ctx, (const char *) duk_initjs_data);  /* initjs data is NUL terminated */
	duk_pop(ctx);
#endif  /* DUK_USE_BUILTIN_INITJS */

#ifdef DUK_USE_USER_INITJS
	/* XXX: compression (as an option) */
	DUK_DD(DUK_DDPRINT("running user initjs"));
	duk_eval_string_noresult(ctx, (const char *) DUK_USE_USER_INITJS);
#endif  /* DUK_USE_USER_INITJS */

	/*
	 *  Since built-ins are not often extended, compact them.
	 */

	DUK_DD(DUK_DDPRINT("compact built-ins"));
	for (i = 0; i < DUK_NUM_BUILTINS; i++) {
		duk_hobject_compact_props(thr, thr->builtins[i]);
	}

	DUK_D(DUK_DPRINT("INITBUILTINS END"));

#ifdef DUK_USE_DDPRINT
	for (i = 0; i < DUK_NUM_BUILTINS; i++) {
		DUK_DD(DUK_DDPRINT("built-in object %ld after initialization and compacting: %!@iO",
		                   (long) i, (duk_heaphdr *) thr->builtins[i]));
	}
#endif
	
#ifdef DUK_USE_DDDPRINT /*XXX:incorrect*/
	for (i = 0; i < DUK_NUM_BUILTINS; i++) {
		DUK_DDD(DUK_DDDPRINT("built-in object %ld after initialization and compacting", (long) i));
		DUK_DEBUG_DUMP_HOBJECT(thr->builtins[i]);
	}
#endif

	/*
	 *  Pop built-ins from stack: they are now INCREF'd and
	 *  reachable from the builtins[] array.
	 */

	duk_pop_n(ctx, DUK_NUM_BUILTINS);
	DUK_ASSERT_TOP(ctx, 0);
}
Exemplo n.º 2
0
/* basic enum success cases */
int test_1(duk_context *ctx) {
	duk_set_top(ctx, 0);

	printf("object with own properties only, enum with get_value=0\n");
	duk_eval_string(ctx, "({ 1: 1, foo: 2, bar: 3, quux: 4, 2: 5 })");
	duk_enum(ctx, -1, 0 /*enum_flags*/);  /* [ obj enum ] */
	while (duk_next(ctx, -1 /*enum_index*/, 0 /*get_value*/)) {
		printf("key: '%s'\n", duk_get_string(ctx, -1));
		duk_pop(ctx);
	}
	duk_pop_2(ctx);

	printf("object with own properties only, enum with get_value=1\n");
	duk_eval_string(ctx, "({ 1: 1, foo: 2, bar: 3, quux: 4, 2: 5 })");
	duk_enum(ctx, -1, 0 /*enum_flags*/);  /* [ obj enum ] */
	while (duk_next(ctx, -1 /*enum_index*/, 1 /*get_value*/)) {
		printf("key: '%s', value: '%s'\n", duk_get_string(ctx, -2), duk_to_string(ctx, -1));
		duk_pop_2(ctx);
	}
	duk_pop(ctx);
	duk_pop(ctx);

	printf("object with inherited, enumerable properties, enum with get_value=1\n");
	duk_eval_string(ctx, "(function () { var o = Object.create({ parent: 'inherited' }); o.foo = 'bar'; return o; })()");
	duk_enum(ctx, -1, 0 /*enum_flags*/);  /* [ obj enum ] */
	while (duk_next(ctx, -1 /*enum_index*/, 1 /*get_value*/)) {
		printf("key: '%s', value: '%s'\n", duk_get_string(ctx, -2), duk_to_string(ctx, -1));
		duk_pop_2(ctx);
	}
	duk_pop(ctx);
	duk_pop(ctx);

	printf("object with own non-enumerable properties, enum with get_value=1, don't enum inherited properties\n");
	duk_eval_string(ctx, "(function () { var o = Object.create({ parent: 'inherited' }); "
	                     "Object.defineProperty(o, 'enumerable_prop', { value: 123, writable: true, enumerable: true, configurable: true}); "
	                     "Object.defineProperty(o, 'nonenumerable_prop', { value: 234, writable: true, enumerable: false, configurable: true}); "
	                     " return o; })()");
	printf("- enum only enumerable own properties\n");
	duk_enum(ctx, -1, DUK_ENUM_OWN_PROPERTIES_ONLY /*enum_flags*/);  /* [ obj enum ] */
	while (duk_next(ctx, -1 /*enum_index*/, 1 /*get_value*/)) {
		printf("key: '%s', value: '%s'\n", duk_get_string(ctx, -2), duk_to_string(ctx, -1));
		duk_pop_2(ctx);
	}
	duk_pop(ctx);
	printf("- enum all own properties\n");
	duk_enum(ctx, -1, DUK_ENUM_OWN_PROPERTIES_ONLY | DUK_ENUM_INCLUDE_NONENUMERABLE /*enum_flags*/);  /* [ obj enum ] */
	while (duk_next(ctx, -1 /*enum_index*/, 1 /*get_value*/)) {
		printf("key: '%s', value: '%s'\n", duk_get_string(ctx, -2), duk_to_string(ctx, -1));
		duk_pop_2(ctx);
	}
	duk_pop(ctx);
	duk_pop(ctx);

	printf("object with string and array index keys, enum with get_value=1\n");
	duk_eval_string(ctx, "({ foo: 'val1', 999: 'val2', 1: 'val3', 123: 'val4', 234: 'val5', 2: 'val6', bar: 'val7' })");
	printf("- enum array indices only, not sorted\n");
	duk_enum(ctx, -1, DUK_ENUM_ARRAY_INDICES_ONLY /*enum_flags*/);  /* [ obj enum ] */
	while (duk_next(ctx, -1 /*enum_index*/, 1 /*get_value*/)) {
		printf("key: '%s', value: '%s'\n", duk_get_string(ctx, -2), duk_to_string(ctx, -1));
		duk_pop_2(ctx);
	}
	duk_pop(ctx);
	printf("- enum array indices only, sorted\n");
	duk_enum(ctx, -1, DUK_ENUM_ARRAY_INDICES_ONLY | DUK_ENUM_SORT_ARRAY_INDICES /*enum_flags*/);  /* [ obj enum ] */
	while (duk_next(ctx, -1 /*enum_index*/, 1 /*get_value*/)) {
		printf("key: '%s', value: '%s'\n", duk_get_string(ctx, -2), duk_to_string(ctx, -1));
		duk_pop_2(ctx);
	}
	duk_pop(ctx);
	duk_pop(ctx);

	/* XXX: there is no test for DUK_ENUM_INCLUDE_INTERNAL now,
	 * this is a bit difficult because internal properties are
	 * not exposed or stable.
	 */

	printf("final top: %d\n", duk_get_top(ctx));
	return 0;
}
Exemplo n.º 3
0
static duk_ret_t test_recursive_finalizer(duk_context *ctx, void *udata) {
	(void) udata;

	/* Object to be finalized */
	duk_push_object(ctx);
	duk_push_int(ctx, 123);
	duk_put_prop_string(ctx, -2, "foo");

	/* Ecmascript finalizer */
	duk_eval_string(ctx, "(function (obj) { print('finalizing obj, obj.foo:', obj.foo); })");
	duk_push_int(ctx, 321);
	duk_put_prop_string(ctx, -2, "bar");

	/* [ target finalizer ] */

	/* Break the function <-> prototype reference loop so that the
	 * Ecmascript finalizer is not in a reference loop and gets
	 * collected by refcounting.
	 *
	 * (Note that 'prototype' is not configurable so we can't
	 * delete it.)
	 */
	duk_push_string(ctx, "dummy");
	duk_put_prop_string(ctx, -2, "prototype");

	/* Add a Duktape/C finalizer for the Ecmascript finalizer to
	 * exercise both Duktape/C finalizers and recursive finalization
	 */
	duk_push_c_function(ctx, c_finalizer, 1);
	duk_push_int(ctx, 234);
	duk_put_prop_string(ctx, -2, "quux");
	duk_set_finalizer(ctx, -2);

	/* [ target(foo:123) finalizer(bar:321) ] */

	/* Set Ecmascript finalizer to original object */
	duk_set_finalizer(ctx, -2);

	/* [ target(foo:123) ] */

	printf("top: %ld\n", (long) duk_get_top(ctx));

	/* Read back the finalizer and the finalizer's finalizer */
	duk_get_finalizer(ctx, -1);  /* target's finalizer */
	duk_get_finalizer(ctx, -1);  /* finalizer's finalizer */

	/* [ target(foo:123) finalizer(bar:321) c_finalizer(quux:234) ] */

	duk_get_prop_string(ctx, -2, "bar");
	printf("finalizer.bar=%s\n", duk_safe_to_string(ctx, -1));
	duk_pop(ctx);
	duk_get_prop_string(ctx, -1, "quux");
	printf("c_finalizer.quux=%s\n", duk_safe_to_string(ctx, -1));
	duk_pop(ctx);

	/* [ target(foo:123) finalizer(bar:321) c_finalizer(quux:234) ] */

	printf("before set top 0\n");
	duk_set_top(ctx, 0);  /* causes finalization */
	printf("after set top 0\n");

	/* [ ] */

	/* Explicit GC (just in case e.g. a reference loop prevented collection) */
	printf("before explicit gc\n");
	duk_gc(ctx, 0);
	printf("after explicit gc\n");

	return 0;
}
Exemplo n.º 4
0
DUK_INTERNAL void duk_hthread_create_builtin_objects(duk_hthread *thr) {
	duk_context *ctx = (duk_context *) 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).
	 */

	duk_require_stack(ctx, DUK_NUM_ALL_BUILTINS);

	DUK_DD(DUK_DDPRINT("create empty built-ins"));
	DUK_ASSERT_TOP(ctx, 0);
	for (i = 0; i < DUK_NUM_ALL_BUILTINS; i++) {
		duk_small_uint_t class_num;
		duk_small_int_t len = -1;  /* must be signed */

		class_num = (duk_small_uint_t) duk_bd_decode(bd, DUK__CLASS_BITS);
		len = (duk_small_int_t) duk_bd_decode_flagged(bd, DUK__LENGTH_PROP_BITS, (duk_int32_t) -1 /*def_value*/);

		if (class_num == DUK_HOBJECT_CLASS_FUNCTION) {
			duk_small_uint_t natidx;
			duk_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(bd, DUK__NATIDX_BITS);
			c_func = duk_bi_native_functions[natidx];

			c_nargs = (duk_small_uint_t) duk_bd_decode_flagged(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) */
			duk_push_c_function_noexotic(ctx, c_func, c_nargs);

			h = duk_require_hobject(ctx, -1);
			DUK_ASSERT(h != NULL);

			/* 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 */

			/* Built-in 'name' is not writable by default.  Function '.name'
			 * is writable to allow user code to set a '.name' on a native
			 * function.
			 */
			duk__push_stridx_or_string(ctx, bd);
			duk_xdef_prop_stridx(ctx,
			                     -2,
			                     DUK_STRIDX_NAME,
			                     (i == DUK_BIDX_FUNCTION_PROTOTYPE) ?
			                         DUK_PROPDESC_FLAGS_W : DUK_PROPDESC_FLAGS_NONE);

			/* 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_flagged(bd, DUK__MAGIC_BITS, 0 /*def_value*/);
			((duk_hnatfunc *) h)->magic = magic;
		} else if (class_num == DUK_HOBJECT_CLASS_ARRAY) {
			duk_push_array(ctx);
		} else {
			duk_push_object_helper(ctx,
			                       DUK_HOBJECT_FLAG_EXTENSIBLE,
			                       -1);  /* no prototype or class yet */

		}

		h = duk_require_hobject(ctx, -1);
		DUK_ASSERT(h != NULL);
		DUK_HOBJECT_SET_CLASS_NUMBER(h, class_num);

		if (i < DUK_NUM_BUILTINS) {
			thr->builtins[i] = h;
			DUK_HOBJECT_INCREF(thr, &h->hdr);
		}

		if (len >= 0) {
			/*
			 *  For top-level objects, 'length' property has the following
			 *  default attributes: non-writable, non-enumerable, non-configurable
			 *  (E5 Section 15).
			 *
			 *  However, 'length' property for Array.prototype has attributes
			 *  expected of an Array instance which are different: writable,
			 *  non-enumerable, non-configurable (E5 Section 15.4.5.2).
			 *
			 *  Because Array .length is virtual, it's not encoded in the init
			 *  data separately.
			 */

			DUK_ASSERT(class_num != DUK_HOBJECT_CLASS_ARRAY);  /* .length is virtual */
			duk_push_int(ctx, len);
			duk_xdef_prop_stridx(ctx,
			                     -2,
			                     DUK_STRIDX_LENGTH,
			                     DUK_PROPDESC_FLAGS_NONE);
		}

		/* enable exotic behaviors last */

		if (class_num == DUK_HOBJECT_CLASS_ARRAY) {
			DUK_ASSERT(DUK_HOBJECT_HAS_EXOTIC_ARRAY(h));  /* set by duk_push_array() */
		}
		if (class_num == DUK_HOBJECT_CLASS_STRING) {
			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_HAS_THREAD(h));
		DUK_ASSERT(!DUK_HOBJECT_HAS_ARRAY_PART(h) || class_num == DUK_HOBJECT_CLASS_ARRAY);
		/* 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_ASSERT(!DUK_HOBJECT_HAS_ENVRECCLOSED(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, class=%ld, length=%ld", (long) i, (long) class_num, (long) len));
	}

	/*
	 *  Then decode the builtins init data (see genbuiltins.py) to
	 *  init objects
	 */

	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_require_hobject(ctx, i);
		DUK_ASSERT(h != NULL);

		t = (duk_small_uint_t) duk_bd_decode(bd, DUK__BIDX_BITS);
		if (t != DUK__NO_BIDX_MARKER) {
			DUK_DDD(DUK_DDDPRINT("set internal prototype: built-in %ld", (long) t));
			DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, h, duk_require_hobject(ctx, t));
		}

		t = (duk_small_uint_t) duk_bd_decode(bd, DUK__BIDX_BITS);
		if (t != DUK__NO_BIDX_MARKER) {
			/* 'prototype' property for all built-in objects (which have it) has attributes:
			 *  [[Writable]] = false,
			 *  [[Enumerable]] = false,
			 *  [[Configurable]] = false
			 */
			DUK_DDD(DUK_DDDPRINT("set external prototype: built-in %ld", (long) t));
			duk_xdef_prop_stridx_builtin(ctx, i, DUK_STRIDX_PROTOTYPE, t, DUK_PROPDESC_FLAGS_NONE);
		}

		t = (duk_small_uint_t) duk_bd_decode(bd, DUK__BIDX_BITS);
		if (t != DUK__NO_BIDX_MARKER) {
			/* 'constructor' property for all built-in objects (which have it) has attributes:
			 *  [[Writable]] = true,
			 *  [[Enumerable]] = false,
			 *  [[Configurable]] = true
			 */
			DUK_DDD(DUK_DDDPRINT("set external constructor: built-in %ld", (long) t));
			duk_xdef_prop_stridx_builtin(ctx, i, DUK_STRIDX_CONSTRUCTOR, t, DUK_PROPDESC_FLAGS_WC);
		}

		/* normal valued properties */
		num = (duk_small_uint_t) duk_bd_decode(bd, DUK__NUM_NORMAL_PROPS_BITS);
		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 prop_flags;

			duk__push_stridx_or_string(ctx, 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.
			 */

			if (duk_bd_decode_flag(bd)) {
				prop_flags = (duk_small_uint_t) duk_bd_decode(bd, DUK__PROP_FLAGS_BITS);
			} else {
				prop_flags = DUK_PROPDESC_FLAGS_WC;
			}

			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(ctx, -1), (unsigned long) prop_flags, (long) t));

			switch (t) {
			case DUK__PROP_TYPE_DOUBLE: {
				duk__push_double(ctx, bd);
				break;
			}
			case DUK__PROP_TYPE_STRING: {
				duk__push_string(ctx, bd);
				break;
			}
			case DUK__PROP_TYPE_STRIDX: {
				duk__push_stridx(ctx, bd);
				break;
			}
			case DUK__PROP_TYPE_BUILTIN: {
				duk_small_uint_t bidx;

				bidx = (duk_small_uint_t) duk_bd_decode(bd, DUK__BIDX_BITS);
				DUK_ASSERT(bidx != DUK__NO_BIDX_MARKER);
				duk_dup(ctx, (duk_idx_t) bidx);
				break;
			}
			case DUK__PROP_TYPE_UNDEFINED: {
				duk_push_undefined(ctx);
				break;
			}
			case DUK__PROP_TYPE_BOOLEAN_TRUE: {
				duk_push_true(ctx);
				break;
			}
			case DUK__PROP_TYPE_BOOLEAN_FALSE: {
				duk_push_false(ctx);
				break;
			}
			case DUK__PROP_TYPE_ACCESSOR: {
				duk_small_uint_t natidx_getter = (duk_small_uint_t) duk_bd_decode(bd, DUK__NATIDX_BITS);
				duk_small_uint_t natidx_setter = (duk_small_uint_t) duk_bd_decode(bd, DUK__NATIDX_BITS);
				duk_c_function c_func_getter;
				duk_c_function c_func_setter;

				/* XXX: this is a bit awkward because there is no exposed helper
				 * in the API style, only this internal helper.
				 */
				DUK_DDD(DUK_DDDPRINT("built-in accessor property: objidx=%ld, key=%!T, getteridx=%ld, setteridx=%ld, flags=0x%04lx",
				                     (long) i, duk_get_tval(ctx, -1), (long) natidx_getter, (long) natidx_setter, (unsigned long) prop_flags));

				c_func_getter = duk_bi_native_functions[natidx_getter];
				c_func_setter = duk_bi_native_functions[natidx_setter];
				duk_push_c_function_noconstruct_noexotic(ctx, c_func_getter, 0);  /* always 0 args */
				duk_push_c_function_noconstruct_noexotic(ctx, c_func_setter, 1);  /* always 1 arg */

				/* XXX: magic for getter/setter? use duk_def_prop()? */

				DUK_ASSERT((prop_flags & DUK_PROPDESC_FLAG_WRITABLE) == 0);  /* genbuiltins.py ensures */

				prop_flags |= DUK_PROPDESC_FLAG_ACCESSOR;  /* accessor flag not encoded explicitly */
				duk_hobject_define_accessor_internal(thr,
				                                     duk_require_hobject(ctx, i),
				                                     duk_get_hstring(ctx, -3),
				                                     duk_require_hobject(ctx, -2),
				                                     duk_require_hobject(ctx, -1),
				                                     prop_flags);
				duk_pop_3(ctx);  /* key, getter and setter, now reachable through object */
				goto skip_value;
			}
			default: {
				/* exhaustive */
				DUK_UNREACHABLE();
			}
			}

			DUK_ASSERT((prop_flags & DUK_PROPDESC_FLAG_ACCESSOR) == 0);
			duk_xdef_prop(ctx, i, prop_flags);

		 skip_value:
			continue;  /* avoid empty label at the end of a compound statement */
		}

		/* native function properties */
		num = (duk_small_uint_t) duk_bd_decode(bd, DUK__NUM_FUNC_PROPS_BITS);
		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__push_stridx_or_string(ctx, bd);
			h_key = duk_get_hstring(ctx, -1);
			DUK_ASSERT(h_key != NULL);
			DUK_UNREF(h_key);
			natidx = (duk_small_uint_t) duk_bd_decode(bd, DUK__NATIDX_BITS);

			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_int32_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_flagged(bd, DUK__MAGIC_BITS, 0);

#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);

			if (h_key == DUK_HTHREAD_STRING_EVAL(thr) ||
			    h_key == DUK_HTHREAD_STRING_YIELD(thr) ||
			    h_key == DUK_HTHREAD_STRING_RESUME(thr)) {
				/* 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).
				 */
				DUK_D(DUK_DPRINT("reject as lightfunc: key=%!O, i=%d, j=%d", (duk_heaphdr *) h_key, (int) i, (int) j));
				lightfunc_eligible = 0;
			}

			if (lightfunc_eligible) {
				duk_tval tv_lfunc;
				duk_small_uint_t lf_nargs = (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(ctx, &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(ctx, -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_noconstruct_noexotic(ctx, c_func, c_nargs);
			h_func = duk_require_hnatfunc(ctx, -1);
			DUK_UNREF(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_int(ctx, c_length);
			duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_LENGTH, DUK_PROPDESC_FLAGS_NONE);

			duk_dup(ctx, -2);
			duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_NAME, DUK_PROPDESC_FLAGS_NONE);

			/* 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(ctx, -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

			duk_xdef_prop(ctx, i, DUK_PROPDESC_FLAGS_WC);

			/* [ (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.
	 */

	duk_get_prop_stridx(ctx, DUK_BIDX_DATE_PROTOTYPE, DUK_STRIDX_TO_UTC_STRING);
	duk_xdef_prop_stridx(ctx, DUK_BIDX_DATE_PROTOTYPE, DUK_STRIDX_TO_GMT_STRING, DUK_PROPDESC_FLAGS_WC);

	h = duk_require_hobject(ctx, DUK_BIDX_DOUBLE_ERROR);
	DUK_ASSERT(h != NULL);
	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_hobject_delprop_raw(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_hobject_delprop_raw(thr, thr->builtins[DUK_BIDX_OBJECT_CONSTRUCTOR], DUK_HTHREAD_STRING_SET_PROTOTYPE_OF(thr), DUK_DELPROP_FLAG_THROW);
#endif

	/* XXX: relocate */
	duk_push_string(ctx,
			/* 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 options */
#if defined(DUK_USE_STRTAB_CHAIN)
			"c"  /* chain */
#elif defined(DUK_USE_STRTAB_PROBE)
			"p"  /* probe */
#else
			"?"
#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
	                " "
			/* Object property allocation layout */
#if defined(DUK_USE_HOBJECT_LAYOUT_1)
			"p1"
#elif defined(DUK_USE_HOBJECT_LAYOUT_2)
			"p2"
#elif defined(DUK_USE_HOBJECT_LAYOUT_3)
			"p3"
#else
			"p?"
#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(ctx, DUK_BIDX_DUKTAPE, DUK_STRIDX_ENV, DUK_PROPDESC_FLAGS_WC);

	/*
	 *  InitJS code - Ecmascript code evaluated from a built-in source
	 *  which provides e.g. backward compatibility.  User can also provide
	 *  JS code to be evaluated at startup.
	 */

#ifdef DUK_USE_BUILTIN_INITJS
	/* XXX: compression */
	DUK_DD(DUK_DDPRINT("running built-in initjs"));
	duk_eval_string(ctx, (const char *) duk_initjs_data);  /* initjs data is NUL terminated */
	duk_pop(ctx);
#endif  /* DUK_USE_BUILTIN_INITJS */

#ifdef DUK_USE_USER_INITJS
	/* XXX: compression (as an option) */
	DUK_DD(DUK_DDPRINT("running user initjs"));
	duk_eval_string_noresult(ctx, (const char *) DUK_USE_USER_INITJS);
#endif  /* DUK_USE_USER_INITJS */

	/*
	 *  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_props(thr, duk_require_hobject(ctx, 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(ctx, 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(ctx, 0);
	DUK_ASSERT_TOP(ctx, 0);
}
Exemplo n.º 5
0
static void remove_handlers(duk_context *ctx) {
	duk_eval_string(ctx, "delete Duktape.errCreate; delete Duktape.errThrow;");
	duk_pop(ctx);
}
Exemplo n.º 6
0
			/* in interactive mode, write to stdout */
			print_pop_error(ctx, stdout);
			retval = -1;  /* an error 'taints' the execution */
		} else {
			duk_pop(ctx);
		}
	}

 done:
	if (buffer) {
		free(buffer);
		buffer = NULL;
	}

	return retval;
}
#else  /* NO_READLINE */
static int handle_interactive(duk_context *ctx) {
	const char *prompt = "duk> ";
	char *buffer = NULL;
	int retval = 0;
	int rc;

	duk_eval_string(ctx, GREET_CODE(""));
	duk_pop(ctx);

	/*
	 *  Note: using readline leads to valgrind-reported leaks inside
	 *  readline itself.  Execute code from an input file (and not
	 *  through stdin) for clean valgrind runs.
	 */

	rl_initialize();

	for (;;) {
		if (buffer) {
			free(buffer);
			buffer = NULL;
		}

		buffer = readline(prompt);
		if (!buffer) {
			break;
		}

		if (buffer && buffer[0] != (char) 0) {
			add_history(buffer);
		}

		duk_push_pointer(ctx, (void *) buffer);
		duk_push_uint(ctx, (duk_uint_t) strlen(buffer));
		duk_push_string(ctx, "input");

		interactive_mode = 1;  /* global */

		rc = duk_safe_call(ctx, wrapped_compile_execute, 3 /*nargs*/, 1 /*nret*/);

#if defined(DUK_CMDLINE_AJSHEAP)
		ajsheap_clear_exec_timeout();
#endif

		if (buffer) {
			free(buffer);
			buffer = NULL;
		}

		if (rc != DUK_EXEC_SUCCESS) {
			/* in interactive mode, write to stdout */
			print_pop_error(ctx, stdout);
			retval = -1;  /* an error 'taints' the execution */
		} else {
			duk_pop(ctx);
		}
	}

	if (buffer) {
		free(buffer);
		buffer = NULL;
	}

	return retval;
}
Exemplo n.º 7
0
static int handle_interactive(duk_context *ctx) {
	const char *prompt = "duk> ";
	char *buffer = NULL;
	int retval = 0;
	int rc;
	int got_eof = 0;

	duk_eval_string(ctx, GREET_CODE(" [no readline]"));
	duk_pop(ctx);

	buffer = (char *) malloc(LINEBUF_SIZE);
	if (!buffer) {
		fprintf(stderr, "failed to allocated a line buffer\n");
		fflush(stderr);
		retval = -1;
		goto done;
	}

	while (!got_eof) {
		size_t idx = 0;

		fwrite(prompt, 1, strlen(prompt), stdout);
		fflush(stdout);

		for (;;) {
			int c = fgetc(stdin);
			if (c == EOF) {
				got_eof = 1;
				break;
			} else if (c == '\n') {
				break;
			} else if (idx >= LINEBUF_SIZE) {
				fprintf(stderr, "line too long\n");
				fflush(stderr);
				retval = -1;
				goto done;
			} else {
				buffer[idx++] = (char) c;
			}
		}

		duk_push_pointer(ctx, (void *) buffer);
		duk_push_uint(ctx, (duk_uint_t) idx);
		duk_push_string(ctx, "input");

		interactive_mode = 1;  /* global */

		rc = duk_safe_call(ctx, wrapped_compile_execute, 3 /*nargs*/, 1 /*nret*/);

#if defined(DUK_CMDLINE_AJSHEAP)
		ajsheap_clear_exec_timeout();
#endif

		if (rc != DUK_EXEC_SUCCESS) {
			/* in interactive mode, write to stdout */
			print_pop_error(ctx, stdout);
			retval = -1;  /* an error 'taints' the execution */
		} else {
			duk_pop(ctx);
		}
	}

 done:
	if (buffer) {
		free(buffer);
		buffer = NULL;
	}

	return retval;
}