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Implement @@toStringTag well-known symbol related features (#2739)

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JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
This commit is contained in:
Robert Fancsik
2019-02-01 14:59:22 +01:00
committed by László Langó
parent ca8442c523
commit 5c1a4f18ea
11 changed files with 277 additions and 1 deletions
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jerry-core/ecma/builtin-objects/ecma-builtin-helpers.c
+84 -1
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@@ -21,7 +21,9 @@
#include "ecma-conversion.h"
#include "ecma-function-object.h"
#include "ecma-exceptions.h"
#include "ecma-gc.h"
#include "ecma-helpers.h"
#include "jmem.h"
#include "ecma-objects.h"
#include "ecma-try-catch-macro.h"
#include "lit-magic-strings.h"
@@ -33,6 +35,69 @@
* @{
*/
#ifndef CONFIG_DISABLE_ES2015_SYMBOL_BUILTIN
/**
* Helper function for Object.prototype.toString routine when
* the @@toStringTag property is present
*
* See also:
* ECMA-262 v6, 19.1.3.6
*
* @return ecma value
* Returned value must be freed with ecma_free_value.
*/
static ecma_value_t
ecma_builtin_helper_object_to_string_tag_helper (ecma_value_t tag_value) /**< string tag */
{
JERRY_ASSERT (ecma_is_value_string (tag_value));
ecma_string_t *tag_str_p = ecma_get_string_from_value (tag_value);
ecma_string_t *ret_string_p;
/* Building string "[object #@@toStringTag#]"
The string size will be size("[object ") + size(#@@toStringTag#) + size ("]"). */
const lit_utf8_size_t buffer_size = 9 + ecma_string_get_size (tag_str_p);
JMEM_DEFINE_LOCAL_ARRAY (str_buffer, buffer_size, lit_utf8_byte_t);
lit_utf8_byte_t *buffer_ptr = str_buffer;
const lit_magic_string_id_t magic_string_ids[] =
{
LIT_MAGIC_STRING_LEFT_SQUARE_CHAR,
LIT_MAGIC_STRING_OBJECT,
LIT_MAGIC_STRING_SPACE_CHAR,
};
/* Copy to buffer the "[object " string */
for (uint32_t i = 0; i < sizeof (magic_string_ids) / sizeof (lit_magic_string_id_t); ++i)
{
buffer_ptr = lit_copy_magic_string_to_buffer (magic_string_ids[i], buffer_ptr,
(lit_utf8_size_t) ((str_buffer + buffer_size) - buffer_ptr));
JERRY_ASSERT (buffer_ptr <= str_buffer + buffer_size);
}
/* Copy to buffer the #@@toStringTag# string */
buffer_ptr += ecma_string_copy_to_utf8_buffer (tag_str_p, buffer_ptr,
(lit_utf8_size_t) ((str_buffer + buffer_size) - buffer_ptr));
JERRY_ASSERT (buffer_ptr <= str_buffer + buffer_size);
/* Copy to buffer the "]" string */
buffer_ptr = lit_copy_magic_string_to_buffer (LIT_MAGIC_STRING_RIGHT_SQUARE_CHAR, buffer_ptr,
(lit_utf8_size_t) ((str_buffer + buffer_size) - buffer_ptr));
JERRY_ASSERT (buffer_ptr <= str_buffer + buffer_size);
ret_string_p = ecma_new_ecma_string_from_utf8 (str_buffer, (lit_utf8_size_t) (buffer_ptr - str_buffer));
JMEM_FINALIZE_LOCAL_ARRAY (str_buffer);
ecma_deref_ecma_string (tag_str_p);
return ecma_make_string_value (ret_string_p);
} /* ecma_builtin_helper_object_to_string_tag_helper */
#endif /* !CONFIG_DISABLE_ES2015_SYMBOL_BUILTIN */
/**
* Common implementation of the Object.prototype.toString routine
*
@@ -75,7 +140,25 @@ ecma_builtin_helper_object_to_string (const ecma_value_t this_arg) /**< this arg
type_string = ecma_object_get_class_name (obj_p);
ecma_free_value (obj_this);
#ifndef CONFIG_DISABLE_ES2015_SYMBOL_BUILTIN
ecma_value_t tag_value = ecma_op_object_get_by_symbol_id (obj_p, LIT_MAGIC_STRING_TO_STRING_TAG);
if (ECMA_IS_VALUE_ERROR (tag_value))
{
ecma_deref_object (obj_p);
return tag_value;
}
if (ecma_is_value_string (tag_value))
{
ecma_deref_object (obj_p);
return ecma_builtin_helper_object_to_string_tag_helper (tag_value);
}
ecma_free_value (tag_value);
#endif /* !CONFIG_DISABLE_ES2015_SYMBOL_BUILTIN */
ecma_deref_object (obj_p);
}
ecma_string_t *ret_string_p;