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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-parser-internal.h
+13 -9
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@@ -64,9 +64,10 @@ typedef enum
PARSER_DEBUGGER_BREAKPOINT_APPENDED = (1u << 15), /**< pending (unsent) breakpoint
* info is available */
#if ENABLED (JERRY_ES2015)
PARSER_FUNCTION_HAS_REST_PARAM = (1u << 16), /**< function has rest parameter */
PARSER_IS_ARROW_FUNCTION = (1u << 18), /**< an arrow function is parsed */
PARSER_ARROW_PARSE_ARGS = (1u << 19), /**< parse the argument list of an arrow function */
PARSER_INSIDE_BLOCK = (1u << 16), /**< script has a lexical environment for let and const */
PARSER_IS_ARROW_FUNCTION = (1u << 17), /**< an arrow function is parsed */
PARSER_ARROW_PARSE_ARGS = (1u << 18), /**< parse the argument list of an arrow function */
PARSER_FUNCTION_HAS_REST_PARAM = (1u << 19), /**< function has rest parameter */
/* These four status flags must be in this order. See PARSER_CLASS_PARSE_OPTS_OFFSET. */
PARSER_CLASS_CONSTRUCTOR = (1u << 20), /**< a class constructor is parsed (this value must be kept in
* in sync with ECMA_PARSE_CLASS_CONSTRUCTOR) */
@@ -371,8 +372,11 @@ typedef struct parser_saved_context_t
parser_mem_data_t literal_pool_data; /**< literal list */
parser_scope_stack *scope_stack_p; /**< scope stack */
uint16_t scope_stack_size; /**< size of scope stack */
uint16_t scope_stack_top; /**< current top of scope stack */
uint16_t scope_stack_reg_top; /**< current top register of scope stack */
uint16_t scope_stack_top; /**< preserved top of scope stack */
uint16_t scope_stack_reg_top; /**< preserved top register of scope stack */
#if ENABLED (JERRY_ES2015)
uint16_t scope_stack_global_end; /**< end of global declarations of a function */
#endif /* ENABLED (JERRY_ES2015) */
#ifndef JERRY_NDEBUG
uint16_t context_stack_depth; /**< current context stack depth */
@@ -440,6 +444,9 @@ typedef struct
uint16_t scope_stack_size; /**< size of scope stack */
uint16_t scope_stack_top; /**< current top of scope stack */
uint16_t scope_stack_reg_top; /**< current top register of scope stack */
#if ENABLED (JERRY_ES2015)
uint16_t scope_stack_global_end; /**< end of global declarations of a function */
#endif /* ENABLED (JERRY_ES2015) */
uint8_t stack_top_uint8; /**< top byte stored on the stack */
#ifndef JERRY_NDEBUG
@@ -615,10 +622,6 @@ void parser_parse_super_class_context_end (parser_context_t *context_p, bool is_
* @{
*/
void scanner_raise_error (parser_context_t *context_p);
void *scanner_malloc (parser_context_t *context_p, size_t size);
void scanner_free (void *ptr, size_t size);
void scanner_release_next (parser_context_t *context_p, size_t size);
void scanner_set_active (parser_context_t *context_p);
void scanner_release_active (parser_context_t *context_p, size_t size);
@@ -627,6 +630,7 @@ void scanner_seek (parser_context_t *context_p);
void scanner_reverse_info_list (parser_context_t *context_p);
void scanner_cleanup (parser_context_t *context_p);
bool scanner_is_context_needed (parser_context_t *context_p);
void scanner_create_variables (parser_context_t *context_p, size_t size);
void scanner_get_location (scanner_location_t *location_p, parser_context_t *context_p);