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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.c
+43 -6
View File
@@ -994,7 +994,8 @@ parser_post_processing (parser_context_t *context_p) /**< context */
length++;
#if ENABLED (JERRY_ES2015)
if (ext_opcode == CBC_EXT_CONSTRUCTOR_RETURN)
if (ext_opcode == CBC_EXT_CONSTRUCTOR_RETURN
|| ext_opcode == CBC_EXT_RETURN_PROMISE)
{
last_opcode = CBC_RETURN;
}
@@ -1140,6 +1141,14 @@ parser_post_processing (parser_context_t *context_p) /**< context */
|| !(PARSER_OPCODE_IS_RETURN (last_opcode)))
{
context_p->status_flags &= (uint32_t) ~PARSER_NO_END_LABEL;
#if ENABLED (JERRY_ES2015)
if (context_p->status_flags & PARSER_IS_ASYNC_FUNCTION)
{
length += 2;
}
#endif /* ENABLED (JERRY_ES2015) */
length++;
}
@@ -1496,6 +1505,16 @@ parser_post_processing (parser_context_t *context_p) /**< context */
if (!(context_p->status_flags & PARSER_NO_END_LABEL))
{
*dst_p++ = CBC_RETURN_WITH_BLOCK;
#if ENABLED (JERRY_ES2015)
if (context_p->status_flags & PARSER_IS_ASYNC_FUNCTION)
{
dst_p[-1] = CBC_PUSH_UNDEFINED;
dst_p[0] = CBC_EXT_OPCODE;
dst_p[1] = CBC_EXT_RETURN_PROMISE;
dst_p += 2;
}
#endif /* ENABLED (JERRY_ES2015) */
}
JERRY_ASSERT (dst_p == byte_code_p + length);
@@ -1657,11 +1676,18 @@ static void
parser_parse_function_arguments (parser_context_t *context_p, /**< context */
lexer_token_type_t end_type) /**< expected end type */
{
JERRY_ASSERT (context_p->next_scanner_info_p->type == SCANNER_TYPE_FUNCTION);
#if ENABLED (JERRY_ES2015)
bool duplicated_argument_names = false;
#endif /* ENABLED (JERRY_ES2015) */
JERRY_ASSERT (context_p->next_scanner_info_p->type == SCANNER_TYPE_FUNCTION);
/* TODO: Currently async iterators are not supported, so generators ignore the async modifier. */
if ((context_p->next_scanner_info_p->u8_arg & SCANNER_FUNCTION_ASYNC)
&& !(context_p->status_flags & PARSER_IS_GENERATOR_FUNCTION))
{
context_p->status_flags |= PARSER_IS_ASYNC_FUNCTION;
}
#endif /* ENABLED (JERRY_ES2015) */
if (context_p->token.type == end_type)
{
@@ -2454,14 +2480,25 @@ parser_parse_arrow_function (parser_context_t *context_p, /**< context */
parser_parse_expression (context_p, PARSE_EXPR_NO_COMMA);
if (context_p->last_cbc_opcode == CBC_PUSH_LITERAL)
#if ENABLED (JERRY_ES2015)
if (context_p->status_flags & PARSER_IS_ASYNC_FUNCTION)
{
context_p->last_cbc_opcode = CBC_RETURN_WITH_LITERAL;
parser_emit_cbc_ext (context_p, CBC_EXT_RETURN_PROMISE);
}
else
{
parser_emit_cbc (context_p, CBC_RETURN);
#endif /* ENABLED (JERRY_ES2015) */
if (context_p->last_cbc_opcode == CBC_PUSH_LITERAL)
{
context_p->last_cbc_opcode = CBC_RETURN_WITH_LITERAL;
}
else
{
parser_emit_cbc (context_p, CBC_RETURN);
}
#if ENABLED (JERRY_ES2015)
}
#endif /* ENABLED (JERRY_ES2015) */
parser_flush_cbc (context_p);
}