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Support strict mode detection in the pre-scanner. (#3450)

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Furthermode an error is thrown when 'use strict' is used in a function with non-simple arguments
and function arguments are not moved to lexical environment when unmapped arguments are present.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2019-12-17 10:59:03 +01:00
committed by Robert Fancsik
parent b1237dbc5a
commit 3c0beaf87d
9 changed files with 305 additions and 138 deletions
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jerry-core/parser/js/js-lexer.c
+36
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@@ -3042,6 +3042,42 @@ lexer_current_is_literal (parser_context_t *context_p, /**< context */
return lexer_compare_identifiers (context_p, left_ident_p, right_ident_p);
} /* lexer_current_is_literal */
/**
* Compares the current string token to "use strict".
*
* Note:
* Escape sequences are not allowed.
*
* @return true if "use strict" is found, false otherwise
*/
inline bool JERRY_ATTR_ALWAYS_INLINE
lexer_string_is_use_strict (parser_context_t *context_p) /**< context */
{
JERRY_ASSERT (context_p->token.type == LEXER_LITERAL
&& context_p->token.lit_location.type == LEXER_STRING_LITERAL);
return (context_p->token.lit_location.length == 10
&& !context_p->token.lit_location.has_escape
&& memcmp (context_p->token.lit_location.char_p, "use strict", 10) == 0);
} /* lexer_string_is_use_strict */
/**
* Checks whether the string before the current token is a directive or a string literal.
*
* @return true if the string is a directive, false otherwise
*/
inline bool JERRY_ATTR_ALWAYS_INLINE
lexer_string_is_directive (parser_context_t *context_p) /**< context */
{
return (context_p->token.type == LEXER_SEMICOLON
|| context_p->token.type == LEXER_RIGHT_BRACE
|| ((context_p->token.flags & LEXER_WAS_NEWLINE)
&& !LEXER_IS_BINARY_OP_TOKEN (context_p->token.type)
&& context_p->token.type != LEXER_LEFT_PAREN
&& context_p->token.type != LEXER_LEFT_SQUARE
&& context_p->token.type != LEXER_DOT));
} /* lexer_string_is_directive */
#if ENABLED (JERRY_ES2015)
/**