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Implement the core of let/const statement. (#3239)

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This patch implements the core part of let/const statements. Redeclarations are correctly
detected and separate contexts are correctly created for these statements. Register
optimizations are also emplyed whenever possible.

Lots of features are still missing:
 - checking the var statements in eval
 - const are treated as lets
 - single statement checks are missing
 - export declarations are exported as vars, let/const export is not supported

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2019-10-25 18:08:10 +02:00
committed by Dániel Bátyai
parent 4b352758c1
commit 3d797b8836
33 changed files with 1997 additions and 217 deletions
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jerry-core/parser/js/js-lexer.h
+6 -19
View File
@@ -151,10 +151,6 @@ typedef enum
LEXER_COMMA_SEP_LIST, /**< comma separated bracketed expression list */
LEXER_SCAN_SWITCH, /**< special value for switch pre-scan */
LEXER_CLASS_CONSTRUCTOR, /**< special value for class constructor method */
#if ENABLED (JERRY_ES2015)
LEXER_FOR_IN_OF, /**< special value during for in/of statmenet scanning */
LEXER_LITERAL_OF, /**< 'of' literal */
#endif /* ENABLED (JERRY_ES2015) */
#if !ENABLED (JERRY_ES2015)
/* Future reserved words: these keywords
@@ -164,6 +160,9 @@ typedef enum
LEXER_KEYW_CLASS, /**< class */
LEXER_KEYW_EXTENDS, /**< extends */
LEXER_KEYW_SUPER, /**< super */
#if ENABLED (JERRY_ES2015)
LEXER_KEYW_LET, /**< let */
#endif /* ENABLED (JERRY_ES2015) */
LEXER_KEYW_CONST, /**< const */
LEXER_KEYW_EXPORT, /**< export */
LEXER_KEYW_IMPORT, /**< import */
@@ -190,25 +189,13 @@ typedef enum
LEXER_KEYW_PACKAGE, /**< package */
LEXER_KEYW_PROTECTED, /**< protected */
#if ENABLED (JERRY_ES2015)
/* Context dependent strict reserved words:
* See also: ECMA-262 v6, 11.6.2.1 */
#define LEXER_FIRST_CONTEXT_DEPENDENT_RESERVED_WORD LEXER_KEYW_STATIC
LEXER_KEYW_STATIC, /**< static */
#else /* !ENABLED (JERRY_ES2015) */
/* Context dependent strict reserved words:
* See also: ECMA-262 v6, 11.6.2.1 */
#define LEXER_FIRST_CONTEXT_DEPENDENT_RESERVED_WORD
#endif /* ENABLED (JERRY_ES2015) */
/* Context dependent future strict reserved words:
* See also: ECMA-262 v6, 11.6.2.1 */
#define LEXER_FIRST_CONTEXT_DEPENDENT_FUTURE_RESERVED_WORD LEXER_KEYW_LET
LEXER_KEYW_LET, /**< let */
LEXER_KEYW_YIELD, /**< yield */
#if !ENABLED (JERRY_ES2015)
LEXER_KEYW_STATIC, /**< static */
LEXER_KEYW_LET, /**< let */
#endif /* !ENABLED (JERRY_ES2015) */
LEXER_KEYW_YIELD, /**< yield */
LEXER_KEYW_STATIC, /**< static */
} lexer_token_type_t;
#define LEXER_NEWLINE_LS_PS_BYTE_1 0xe2