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Rework the core of class parsing/runtime semantic (#3598)

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Changes:
 - Use the pre-scanner to provide information for the parser about the existence of the class constructor
 - The allocation of the super declarative environment is no longer needed
 - The VM frame context holds the information about the this binding status
 - Reduce the number of class related VM/CBC instructions
 - Improve ecma_op_function_{construct, call} to properly set new.target

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
This commit is contained in:
Robert Fancsik
2020-03-16 14:37:47 +01:00
committed by GitHub
parent 56b9f098ab
commit bfd2639634
49 changed files with 1671 additions and 1490 deletions
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jerry-core/ecma/base/ecma-globals.h
+19 -17
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@@ -111,15 +111,14 @@ typedef enum
ECMA_PARSE_EVAL = (1u << 2), /**< eval is called */
ECMA_PARSE_DIRECT_EVAL = (1u << 3), /**< eval is called directly (ECMA-262 v5, 15.1.2.1.1) */
/* These four status flags must be in this order. See PARSER_CLASS_PARSE_OPTS_OFFSET. */
/* These three status flags must be in this order. See PARSER_SAVED_FLAGS_OFFSET. */
ECMA_PARSE_CLASS_CONSTRUCTOR = (1u << 4), /**< a class constructor is being parsed (this value must be kept in
* in sync with PARSER_CLASS_CONSTRUCTOR) */
ECMA_PARSE_HAS_SUPER = (1u << 5), /**< the current context has super reference */
ECMA_PARSE_HAS_IMPL_SUPER = (1u << 6), /**< the current context has implicit parent class */
ECMA_PARSE_HAS_STATIC_SUPER = (1u << 7), /**< the current context is a static class method */
ECMA_PARSE_ALLOW_SUPER = (1u << 5), /**< allow super property access */
ECMA_PARSE_ALLOW_SUPER_CALL = (1u << 6), /**< allow super constructor call */
ECMA_PARSE_CALLED_FROM_FUNCTION = (1u << 8), /**< a function body is parsed or the code is inside a function */
ECMA_PARSE_GENERATOR_FUNCTION = (1u << 9), /**< generator function is parsed */
ECMA_PARSE_CALLED_FROM_FUNCTION = (1u << 7), /**< a function body is parsed or the code is inside a function */
ECMA_PARSE_GENERATOR_FUNCTION = (1u << 8), /**< generator function is parsed */
/* These flags are internally used by the parser. */
} ecma_parse_opts_t;
@@ -195,7 +194,8 @@ enum
* ecma_op_object_find */
ECMA_VALUE_REGISTER_REF = ECMA_MAKE_VALUE (8), /**< register reference,
* a special "base" value for vm */
ECMA_VALUE_IMPLICIT_CONSTRUCTOR = ECMA_MAKE_VALUE (9), /**< special value for bound class constructors */
ECMA_VALUE_RELEASE_LEX_ENV = ECMA_MAKE_VALUE (9), /**< if this error remains on the stack when an exception occours
the top lexical environment of the VM frame should be popped */
ECMA_VALUE_UNINITIALIZED = ECMA_MAKE_VALUE (10), /**< a special value for uninitialized let/const declarations */
ECMA_VALUE_SPREAD_ELEMENT = ECMA_MAKE_VALUE (11), /**< a special value for spread elements in array initialization
* or function call argument list */
@@ -661,12 +661,12 @@ typedef enum
ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE = 13, /**< declarative lexical environment */
ECMA_LEXICAL_ENVIRONMENT_THIS_OBJECT_BOUND = 14, /**< object-bound lexical environment
* with provideThis flag */
ECMA_LEXICAL_ENVIRONMENT_SUPER_OBJECT_BOUND = 15, /**< object-bound lexical environment
* with provided super reference */
ECMA_LEXICAL_ENVIRONMENT_HOME_OBJECT_BOUND = 15, /**< object-bound lexical environment
* with provided home object reference */
ECMA_LEXICAL_ENVIRONMENT_TYPE_START = ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE, /**< first lexical
* environment type */
ECMA_LEXICAL_ENVIRONMENT_TYPE__MAX = ECMA_LEXICAL_ENVIRONMENT_SUPER_OBJECT_BOUND /**< maximum value */
ECMA_LEXICAL_ENVIRONMENT_TYPE__MAX = ECMA_LEXICAL_ENVIRONMENT_HOME_OBJECT_BOUND /**< maximum value */
} ecma_lexical_environment_type_t;
#if ENABLED (JERRY_ES2015)
@@ -686,29 +686,29 @@ typedef enum
/**
* Offset for JERRY_CONTEXT (status_flags) top 8 bits.
*/
#define ECMA_SUPER_EVAL_OPTS_OFFSET (32 - 8)
#define ECMA_LOCAL_PARSE_OPTS_OFFSET ((sizeof (uint32_t) - sizeof (uint8_t)) * JERRY_BITSINBYTE)
/**
* Set JERRY_CONTEXT (status_flags) top 8 bits to the specified 'opts'.
*/
#define ECMA_SET_SUPER_EVAL_PARSER_OPTS(opts) \
#define ECMA_SET_LOCAL_PARSE_OPTS(opts) \
do \
{ \
JERRY_CONTEXT (status_flags) |= ((uint32_t) opts << ECMA_SUPER_EVAL_OPTS_OFFSET) | ECMA_STATUS_DIRECT_EVAL; \
JERRY_CONTEXT (status_flags) |= ((uint32_t) opts << ECMA_LOCAL_PARSE_OPTS_OFFSET) | ECMA_STATUS_DIRECT_EVAL; \
} while (0)
/**
* Get JERRY_CONTEXT (status_flags) top 8 bits.
*/
#define ECMA_GET_SUPER_EVAL_PARSER_OPTS() (JERRY_CONTEXT (status_flags) >> ECMA_SUPER_EVAL_OPTS_OFFSET)
#define ECMA_GET_LOCAL_PARSE_OPTS() (JERRY_CONTEXT (status_flags) >> ECMA_LOCAL_PARSE_OPTS_OFFSET)
/**
* Clear JERRY_CONTEXT (status_flags) top 8 bits.
*/
#define ECMA_CLEAR_SUPER_EVAL_PARSER_OPTS() \
#define ECMA_CLEAR_LOCAL_PARSE_OPTS() \
do \
{ \
JERRY_CONTEXT (status_flags) &= ((1 << ECMA_SUPER_EVAL_OPTS_OFFSET) - 1); \
JERRY_CONTEXT (status_flags) &= ((1 << ECMA_LOCAL_PARSE_OPTS_OFFSET) - 1); \
} while (0)
/**
@@ -778,8 +778,9 @@ typedef struct
union
{
jmem_cpointer_t property_list_cp; /**< compressed pointer to object's
* or declerative lexical environments's property list */
* or declerative lexical environments's property list */
jmem_cpointer_t bound_object_cp; /**< compressed pointer to lexical environments's the bound object */
jmem_cpointer_t home_object_cp; /**< compressed pointer to lexical environments's the home object */
} u1;
/** object prototype or outer reference */
@@ -961,6 +962,7 @@ typedef struct
{
ecma_extended_object_t header; /**< extended object header */
ecma_value_t this_binding; /**< value of 'this' binding */
ecma_value_t new_target; /**< value of new.target */
} ecma_arrow_function_t;
#if ENABLED (JERRY_SNAPSHOT_EXEC)