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Implement async generators (#3916)

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JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2020-06-22 13:54:18 +02:00
committed by GitHub
parent 0f0041d720
commit b2a6109430
32 changed files with 1247 additions and 50 deletions
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jerry-core/ecma/base/ecma-globals.h
+20
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@@ -120,6 +120,7 @@ typedef enum
ECMA_PARSE_FUNCTION_CONTEXT = (1u << 8), /**< function context is present (ECMA_PARSE_DIRECT_EVAL must be set) */
ECMA_PARSE_GENERATOR_FUNCTION = (1u << 9), /**< generator function is parsed */
ECMA_PARSE_ASYNC_FUNCTION = (1u << 10), /**< async function is parsed */
/* These flags are internally used by the parser. */
#ifndef JERRY_NDEBUG
@@ -870,6 +871,7 @@ typedef struct
ecma_value_t value; /**< value of the object (e.g. boolean, number, string, etc.) */
uint32_t length; /**< length related property (e.g. length of ArrayBuffer) */
ecma_value_t target; /**< [[ProxyTarget]] internal property */
ecma_value_t head; /**< points to the async generator task queue head item */
} u;
} class_prop;
@@ -1862,6 +1864,7 @@ typedef enum
ECMA_EXECUTABLE_OBJECT_RUNNING = (1u << 1), /**< executable object is currently running */
/* Generator specific flags. */
ECMA_GENERATOR_ITERATE_AND_YIELD = (1u << 2), /**< the generator performs a yield* operation */
ECMA_ASYNC_GENERATOR_CALLED = (1u << 3), /**< the async generator was executed before */
} ecma_executable_object_flags_t;
/**
@@ -1870,6 +1873,23 @@ typedef enum
#define ECMA_EXECUTABLE_OBJECT_IS_SUSPENDED(extra_info) \
(!((extra_info) & (ECMA_EXECUTABLE_OBJECT_COMPLETED | ECMA_EXECUTABLE_OBJECT_RUNNING)))
/**
* Enqueued task of an AsyncGenerator.
*
* An execution of a task has three steps:
* 1) Perform a next/throw/return operation
* 2) Resume the execution of the AsyncGenerator
* 3) Fulfill or reject a promise if the AsyncGenerator yielded a value
* (these Promises are created by the AsyncGenerator itself)
*/
typedef struct
{
ecma_value_t next; /**< points to the next task which will be performed after this task is completed */
ecma_value_t promise; /**< promise which will be fulfilled or rejected after this task is completed */
ecma_value_t operation_value; /**< value argument of the operation */
uint8_t operation_type; /**< type of operation (see ecma_async_generator_operation_type_t) */
} ecma_async_generator_task_t;
#endif /* ENABLED (JERRY_ESNEXT) */
#if ENABLED (JERRY_BUILTIN_DATAVIEW)