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Support parsing async modifiers for functions. (#3460)

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Only parsing is implemented, so the async functions currently behave
like normal function except they return with a resolved Promise object
when the function is terminated correctly.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2019-12-20 09:55:41 +01:00
committed by GitHub
parent 2a29b72a83
commit 8cb2be6001
22 changed files with 873 additions and 234 deletions
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jerry-core/parser/js/js-parser-expr.c
+42 -1
View File
@@ -547,11 +547,23 @@ parser_parse_class_literal (parser_context_t *context_p) /**< context */
}
}
if (context_p->token.type == LEXER_KEYW_ASYNC)
{
if (!lexer_consume_generator (context_p))
{
lexer_expect_object_literal_id (context_p, LEXER_OBJ_IDENT_ONLY_IDENTIFIERS);
}
}
if (context_p->token.type == LEXER_MULTIPLY)
{
lexer_expect_object_literal_id (context_p, LEXER_OBJ_IDENT_ONLY_IDENTIFIERS);
status_flags |= PARSER_IS_GENERATOR_FUNCTION | PARSER_DISALLOW_YIELD;
}
else
{
status_flags &= (uint32_t) ~(PARSER_IS_GENERATOR_FUNCTION | PARSER_DISALLOW_YIELD);
}
if (context_p->token.type == LEXER_RIGHT_SQUARE)
{
@@ -875,8 +887,20 @@ parser_parse_object_literal (parser_context_t *context_p) /**< context */
}
break;
}
case LEXER_KEYW_ASYNC:
{
lexer_consume_generator (context_p);
/* FALLTHRU */
}
case LEXER_MULTIPLY:
{
uint32_t status_flags = PARSER_FUNCTION_CLOSURE;
if (context_p->token.type == LEXER_MULTIPLY)
{
status_flags |= PARSER_IS_GENERATOR_FUNCTION | PARSER_DISALLOW_YIELD;
}
lexer_expect_object_literal_id (context_p, LEXER_OBJ_IDENT_ONLY_IDENTIFIERS);
uint16_t opcode = CBC_SET_LITERAL_PROPERTY;
@@ -888,7 +912,6 @@ parser_parse_object_literal (parser_context_t *context_p) /**< context */
opcode = PARSER_TO_EXT_OPCODE (CBC_EXT_SET_COMPUTED_PROPERTY_LITERAL);
}
uint32_t status_flags = PARSER_FUNCTION_CLOSURE | PARSER_IS_GENERATOR_FUNCTION | PARSER_DISALLOW_YIELD;
uint16_t function_literal_index = lexer_construct_function_object (context_p, status_flags);
parser_emit_cbc_literal (context_p,
@@ -1383,6 +1406,24 @@ parser_parse_unary_expression (parser_context_t *context_p, /**< context */
{
JERRY_ASSERT (context_p->next_scanner_info_p->type == SCANNER_TYPE_FUNCTION);
if (context_p->next_scanner_info_p->u8_arg & SCANNER_FUNCTION_ASYNC)
{
JERRY_ASSERT (lexer_token_is_async (context_p));
JERRY_ASSERT (!(context_p->next_scanner_info_p->u8_arg & SCANNER_FUNCTION_STATEMENT));
lexer_next_token (context_p);
if (context_p->token.type == LEXER_KEYW_FUNCTION)
{
parser_parse_function_expression (context_p, PARSER_FUNCTION_CLOSURE | PARSER_IS_FUNC_EXPRESSION);
break;
}
if (context_p->token.type == LEXER_LEFT_PAREN)
{
context_p->token.type = LEXER_ARROW_LEFT_PAREN;
}
}
parser_check_assignment_expr (context_p);
parser_parse_function_expression (context_p,
PARSER_IS_FUNCTION | PARSER_IS_ARROW_FUNCTION);