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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/vm/vm-stack.h
+35 -3
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@@ -25,20 +25,46 @@
* @{
*/
#define VM_CREATE_CONTEXT(type, end_offset) ((ecma_value_t) ((type) | (end_offset) << 4))
#define VM_GET_CONTEXT_TYPE(value) ((vm_stack_context_type_t) ((value) & 0xf))
#define VM_GET_CONTEXT_END(value) ((value) >> 4)
/**
* Create context on the vm stack.
*/
#define VM_CREATE_CONTEXT(type, end_offset) ((ecma_value_t) ((type) | ((end_offset) << 6)))
/**
* Create context on the vm stack with environment.
*/
#define VM_CREATE_CONTEXT_WITH_ENV(type, end_offset) \
((ecma_value_t) ((type) | ((end_offset) << 6) | VM_CONTEXT_HAS_LEX_ENV))
/**
* Get type of a vm context.
*/
#define VM_GET_CONTEXT_TYPE(value) ((vm_stack_context_type_t) ((value) & 0x1f))
/**
* Get the end position of a vm context.
*/
#define VM_GET_CONTEXT_END(value) ((value) >> 6)
/**
* This flag is set if the context has a lexical environment.
*/
#define VM_CONTEXT_HAS_LEX_ENV 0x20
/**
* Context types for the vm stack.
*/
typedef enum
{
/* Update VM_CONTEXT_IS_FINALLY macro if the following three values are changed. */
VM_CONTEXT_FINALLY_JUMP, /**< finally context with a jump */
VM_CONTEXT_FINALLY_THROW, /**< finally context with a throw */
VM_CONTEXT_FINALLY_RETURN, /**< finally context with a return */
VM_CONTEXT_TRY, /**< try context */
VM_CONTEXT_CATCH, /**< catch context */
#if ENABLED (JERRY_ES2015)
VM_CONTEXT_BLOCK, /**< block context */
#endif /* ENABLED (JERRY_ES2015) */
VM_CONTEXT_WITH, /**< with context */
VM_CONTEXT_FOR_IN, /**< for-in context */
#if ENABLED (JERRY_ES2015)
@@ -47,6 +73,12 @@ typedef enum
#endif /* ENABLED (JERRY_ES2015) */
} vm_stack_context_type_t;
/**
* Checks whether the context type is a finally type.
*/
#define VM_CONTEXT_IS_FINALLY(context_type) \
((context_type) <= VM_CONTEXT_FINALLY_RETURN)
ecma_value_t *vm_stack_context_abort (vm_frame_ctx_t *frame_ctx_p, ecma_value_t *vm_stack_top_p);
bool vm_stack_find_finally (vm_frame_ctx_t *frame_ctx_p, ecma_value_t **vm_stack_top_ref_p,
vm_stack_context_type_t finally_type, uint32_t search_limit);