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Simplify arrow function parsing #360

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merged 1 commit into from
Apr 14, 2024
Merged

Simplify arrow function parsing #360

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116 changes: 63 additions & 53 deletions quickjs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -21245,12 +21245,10 @@ static __exception int js_parse_object_literal(JSParseState *s)
#define PF_IN_ACCEPTED (1 << 0)
/* allow function calls parsing in js_parse_postfix_expr() */
#define PF_POSTFIX_CALL (1 << 1)
/* allow arrow functions parsing in js_parse_postfix_expr() */
#define PF_ARROW_FUNC (1 << 2)
/* allow the exponentiation operator in js_parse_unary() */
#define PF_POW_ALLOWED (1 << 3)
#define PF_POW_ALLOWED (1 << 2)
/* forbid the exponentiation operator in js_parse_unary() */
#define PF_POW_FORBIDDEN (1 << 4)
#define PF_POW_FORBIDDEN (1 << 3)

static __exception int js_parse_postfix_expr(JSParseState *s, int parse_flags);

Expand Down Expand Up @@ -22910,7 +22908,7 @@ static void optional_chain_test(JSParseState *s, int *poptional_chaining_label,
emit_label(s, label_next);
}

/* allowed parse_flags: PF_POSTFIX_CALL, PF_ARROW_FUNC */
/* allowed parse_flags: PF_POSTFIX_CALL */
static __exception int js_parse_postfix_expr(JSParseState *s, int parse_flags)
{
FuncCallType call_type;
Expand Down Expand Up @@ -22988,18 +22986,8 @@ static __exception int js_parse_postfix_expr(JSParseState *s, int parse_flags)
}
break;
case '(':
if ((parse_flags & PF_ARROW_FUNC) &&
js_parse_skip_parens_token(s, NULL, TRUE) == TOK_ARROW) {
if (js_parse_function_decl(s, JS_PARSE_FUNC_ARROW,
JS_FUNC_NORMAL, JS_ATOM_NULL,
s->token.ptr,
s->token.line_num,
s->token.col_num))
return -1;
} else {
if (js_parse_expr_paren(s))
return -1;
}
if (js_parse_expr_paren(s))
return -1;
break;
case TOK_FUNCTION:
if (js_parse_function_decl(s, JS_PARSE_FUNC_EXPR,
Expand Down Expand Up @@ -23041,16 +23029,8 @@ static __exception int js_parse_postfix_expr(JSParseState *s, int parse_flags)
if (s->token.u.ident.is_reserved) {
return js_parse_error_reserved_identifier(s);
}
if ((parse_flags & PF_ARROW_FUNC) &&
peek_token(s, TRUE) == TOK_ARROW) {
if (js_parse_function_decl(s, JS_PARSE_FUNC_ARROW,
JS_FUNC_NORMAL, JS_ATOM_NULL,
s->token.ptr,
s->token.line_num,
s->token.col_num))
return -1;
} else if (token_is_pseudo_keyword(s, JS_ATOM_async) &&
peek_token(s, TRUE) != '\n') {
if (token_is_pseudo_keyword(s, JS_ATOM_async) &&
peek_token(s, TRUE) != '\n') {
const uint8_t *source_ptr;
int source_line_num;
int source_col_num;
Expand All @@ -23067,17 +23047,6 @@ static __exception int js_parse_postfix_expr(JSParseState *s, int parse_flags)
source_line_num,
source_col_num))
return -1;
} else if ((parse_flags & PF_ARROW_FUNC) &&
((s->token.val == '(' &&
js_parse_skip_parens_token(s, NULL, TRUE) == TOK_ARROW) ||
(s->token.val == TOK_IDENT && !s->token.u.ident.is_reserved &&
peek_token(s, TRUE) == TOK_ARROW))) {
if (js_parse_function_decl(s, JS_PARSE_FUNC_ARROW,
JS_FUNC_ASYNC, JS_ATOM_NULL,
source_ptr,
source_line_num,
source_col_num))
return -1;
} else {
name = JS_DupAtom(s->ctx, JS_ATOM_async);
goto do_get_var;
Expand All @@ -23089,8 +23058,10 @@ static __exception int js_parse_postfix_expr(JSParseState *s, int parse_flags)
return -1;
}
name = JS_DupAtom(s->ctx, s->token.u.ident.atom);
if (next_token(s)) /* update line number before emitting code */
if (next_token(s)) { /* update line number before emitting code */
JS_FreeAtom(s->ctx, name);
return -1;
}
do_get_var:
emit_op(s, OP_scope_get_var);
emit_u32(s, name);
Expand Down Expand Up @@ -23572,7 +23543,7 @@ static __exception int js_parse_delete(JSParseState *s)
return 0;
}

/* allowed parse_flags: PF_ARROW_FUNC, PF_POW_ALLOWED, PF_POW_FORBIDDEN */
/* allowed parse_flags: PF_POW_ALLOWED, PF_POW_FORBIDDEN */
static __exception int js_parse_unary(JSParseState *s, int parse_flags)
{
int op;
Expand Down Expand Up @@ -23662,8 +23633,7 @@ static __exception int js_parse_unary(JSParseState *s, int parse_flags)
parse_flags = 0;
break;
default:
if (js_parse_postfix_expr(s, (parse_flags & PF_ARROW_FUNC) |
PF_POSTFIX_CALL))
if (js_parse_postfix_expr(s, PF_POSTFIX_CALL))
return -1;
if (!s->got_lf &&
(s->token.val == TOK_DEC || s->token.val == TOK_INC)) {
Expand Down Expand Up @@ -23699,15 +23669,14 @@ static __exception int js_parse_unary(JSParseState *s, int parse_flags)
return 0;
}

/* allowed parse_flags: PF_ARROW_FUNC, PF_IN_ACCEPTED */
/* allowed parse_flags: PF_IN_ACCEPTED */
static __exception int js_parse_expr_binary(JSParseState *s, int level,
int parse_flags)
{
int op, opcode;

if (level == 0) {
return js_parse_unary(s, (parse_flags & PF_ARROW_FUNC) |
PF_POW_ALLOWED);
return js_parse_unary(s, PF_POW_ALLOWED);
}
if (js_parse_expr_binary(s, level - 1, parse_flags))
return -1;
Expand Down Expand Up @@ -23834,14 +23803,14 @@ static __exception int js_parse_expr_binary(JSParseState *s, int level,
}
if (next_token(s))
return -1;
if (js_parse_expr_binary(s, level - 1, parse_flags & ~PF_ARROW_FUNC))
if (js_parse_expr_binary(s, level - 1, parse_flags))
return -1;
emit_op(s, opcode);
}
return 0;
}

/* allowed parse_flags: PF_ARROW_FUNC, PF_IN_ACCEPTED */
/* allowed parse_flags: PF_IN_ACCEPTED */
static __exception int js_parse_logical_and_or(JSParseState *s, int op,
int parse_flags)
{
Expand All @@ -23865,11 +23834,10 @@ static __exception int js_parse_logical_and_or(JSParseState *s, int op,
emit_op(s, OP_drop);

if (op == TOK_LAND) {
if (js_parse_expr_binary(s, 8, parse_flags & ~PF_ARROW_FUNC))
if (js_parse_expr_binary(s, 8, parse_flags))
return -1;
} else {
if (js_parse_logical_and_or(s, TOK_LAND,
parse_flags & ~PF_ARROW_FUNC))
if (js_parse_logical_and_or(s, TOK_LAND, parse_flags))
return -1;
}
if (s->token.val != op) {
Expand Down Expand Up @@ -23901,7 +23869,7 @@ static __exception int js_parse_coalesce_expr(JSParseState *s, int parse_flags)
emit_goto(s, OP_if_false, label1);
emit_op(s, OP_drop);

if (js_parse_expr_binary(s, 8, parse_flags & ~PF_ARROW_FUNC))
if (js_parse_expr_binary(s, 8, parse_flags))
return -1;
if (s->token.val != TOK_DOUBLE_QUESTION_MARK)
break;
Expand All @@ -23911,7 +23879,7 @@ static __exception int js_parse_coalesce_expr(JSParseState *s, int parse_flags)
return 0;
}

/* allowed parse_flags: PF_ARROW_FUNC, PF_IN_ACCEPTED */
/* allowed parse_flags: PF_IN_ACCEPTED */
static __exception int js_parse_cond_expr(JSParseState *s, int parse_flags)
{
int label1, label2;
Expand Down Expand Up @@ -24090,12 +24058,54 @@ static __exception int js_parse_assign_expr2(JSParseState *s, int parse_flags)
emit_label(s, label_next);
}
return 0;
} else if (s->token.val == '(' &&
js_parse_skip_parens_token(s, NULL, TRUE) == TOK_ARROW) {
return js_parse_function_decl(s, JS_PARSE_FUNC_ARROW,
JS_FUNC_NORMAL, JS_ATOM_NULL,
s->token.ptr, s->token.line_num,
s->token.col_num);
} else if (token_is_pseudo_keyword(s, JS_ATOM_async)) {
const uint8_t *source_ptr;
int tok, source_line_num, source_col_num;
JSParsePos pos;

/* fast test */
tok = peek_token(s, TRUE);
if (tok == TOK_FUNCTION || tok == '\n')
goto next;

source_ptr = s->token.ptr;
source_line_num = s->token.line_num;
source_col_num = s->token.col_num;
js_parse_get_pos(s, &pos);
if (next_token(s))
return -1;
if ((s->token.val == '(' &&
js_parse_skip_parens_token(s, NULL, TRUE) == TOK_ARROW) ||
(s->token.val == TOK_IDENT && !s->token.u.ident.is_reserved &&
peek_token(s, TRUE) == TOK_ARROW)) {
return js_parse_function_decl(s, JS_PARSE_FUNC_ARROW,
JS_FUNC_ASYNC, JS_ATOM_NULL,
source_ptr, source_line_num,
source_col_num);
} else {
/* undo the token parsing */
if (js_parse_seek_token(s, &pos))
return -1;
}
} else if (s->token.val == TOK_IDENT &&
peek_token(s, TRUE) == TOK_ARROW) {
return js_parse_function_decl(s, JS_PARSE_FUNC_ARROW,
JS_FUNC_NORMAL, JS_ATOM_NULL,
s->token.ptr, s->token.line_num,
s->token.col_num);
}
next:
if (s->token.val == TOK_IDENT) {
/* name0 is used to check for OP_set_name pattern, not duplicated */
name0 = s->token.u.ident.atom;
}
if (js_parse_cond_expr(s, parse_flags | PF_ARROW_FUNC))
if (js_parse_cond_expr(s, parse_flags))
return -1;

op = s->token.val;
Expand Down