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Implement proper creation of function arguments, let and const declarations. (#3725)

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After the rework it is possible to detect use before init errors for function arguments.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2020-05-12 14:38:17 +02:00
committed by GitHub
parent df7e303145
commit 4dc2cb3328
16 changed files with 729 additions and 218 deletions
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jerry-core/parser/js/js-scanner.h
+7 -5
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@@ -131,8 +131,9 @@ typedef struct
typedef enum
{
SCANNER_STREAM_UINT16_DIFF = (1 << 7), /**< relative distance is between -256 and 65535 */
SCANNER_STREAM_HAS_ESCAPE = (1 << 6), /**< literal has escape */
SCANNER_STREAM_NO_REG = (1 << 5), /**< identifier cannot be stored in register */
SCANNER_STREAM_HAS_ESCAPE = (1 << 6), /**< binding has escape */
SCANNER_STREAM_NO_REG = (1 << 5), /**< binding cannot be stored in register */
SCANNER_STREAM_EARLY_CREATE = (1 << 4), /**< binding must be created with ECMA_VALUE_UNINITIALIZED */
/* Update SCANNER_STREAM_TYPE_MASK macro if more bits are added. */
} scanner_compressed_stream_flags_t;
@@ -210,11 +211,12 @@ typedef enum
typedef enum
{
SCANNER_FUNCTION_ARGUMENTS_NEEDED = (1 << 0), /**< arguments object needs to be created */
SCANNER_FUNCTION_MAPPED_ARGUMENTS = (1 << 1), /**< arguments object should be mapped */
#if ENABLED (JERRY_ES2015)
SCANNER_FUNCTION_LEXICAL_ENV_NEEDED = (1 << 1), /**< lexical environment is needed for the function body */
SCANNER_FUNCTION_STATEMENT = (1 << 2), /**< function is function statement (not arrow expression)
SCANNER_FUNCTION_LEXICAL_ENV_NEEDED = (1 << 2), /**< lexical environment is needed for the function body */
SCANNER_FUNCTION_STATEMENT = (1 << 3), /**< function is function statement (not arrow expression)
* this flag must be combined with the type of function (e.g. async) */
SCANNER_FUNCTION_ASYNC = (1 << 3), /**< function is async function */
SCANNER_FUNCTION_ASYNC = (1 << 4), /**< function is async function */
#endif /* ENABLED (JERRY_ES2015) */
} scanner_function_flags_t;