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Support static snapshots. (#2239)

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Unlike normal snapshots, no part of a static snapshot is loaded into
the RAM when executed from ROM. Static snapshots rely heavily on
external magic strings.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2018-03-19 23:46:52 +01:00
committed by yichoi
parent dde09cc4b6
commit bb84466fcf
17 changed files with 850 additions and 166 deletions
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jerry-core/vm/vm.c
+36 -1
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@@ -275,7 +275,15 @@ vm_run_eval (ecma_compiled_code_t *bytecode_data_p, /**< byte-code data */
ecma_deref_object (lex_env_p);
ecma_free_value (this_binding);
#ifdef JERRY_ENABLE_SNAPSHOT_EXEC
if (!(bytecode_data_p->status_flags & CBC_CODE_FLAGS_STATIC_FUNCTION))
{
ecma_bytecode_deref (bytecode_data_p);
}
#else /* !JERRY_ENABLE_SNAPSHOT_EXEC */
ecma_bytecode_deref (bytecode_data_p);
#endif /* JERRY_ENABLE_SNAPSHOT_EXEC */
return completion_value;
} /* vm_run_eval */
@@ -289,8 +297,24 @@ static ecma_value_t
vm_construct_literal_object (vm_frame_ctx_t *frame_ctx_p, /**< frame context */
ecma_value_t lit_value) /**< literal */
{
#ifdef JERRY_ENABLE_SNAPSHOT_EXEC
ecma_compiled_code_t *bytecode_p;
if (likely (!(frame_ctx_p->bytecode_header_p->status_flags & CBC_CODE_FLAGS_STATIC_FUNCTION)))
{
bytecode_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_compiled_code_t,
lit_value);
}
else
{
uint8_t *byte_p = ((uint8_t *) frame_ctx_p->bytecode_header_p) + lit_value;
bytecode_p = (ecma_compiled_code_t *) byte_p;
}
#else /* !JERRY_ENABLE_SNAPSHOT_EXEC */
ecma_compiled_code_t *bytecode_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_compiled_code_t,
lit_value);
#endif /* JERRY_ENABLE_SNAPSHOT_EXEC */
bool is_function = ((bytecode_p->status_flags & CBC_CODE_FLAGS_FUNCTION) != 0);
if (is_function)
@@ -556,7 +580,16 @@ vm_init_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
ecma_value_t *literal_start_p = frame_ctx_p->literal_start_p;
bool is_strict = ((frame_ctx_p->bytecode_header_p->status_flags & CBC_CODE_FLAGS_STRICT_MODE) != 0);
ecma_value_t self_reference;
#ifdef JERRY_ENABLE_SNAPSHOT_EXEC
self_reference = 0;
if (!(bytecode_header_p->status_flags & CBC_CODE_FLAGS_STATIC_FUNCTION))
{
ECMA_SET_INTERNAL_VALUE_POINTER (self_reference, bytecode_header_p);
}
#else /* !JERRY_ENABLE_SNAPSHOT_EXEC */
ECMA_SET_INTERNAL_VALUE_POINTER (self_reference, bytecode_header_p);
#endif
/* Prepare. */
if (!(bytecode_header_p->status_flags & CBC_CODE_FLAGS_FULL_LITERAL_ENCODING))
@@ -625,6 +658,7 @@ vm_init_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
{
uint32_t value_index;
ecma_value_t lit_value;
bool is_immutable_binding = false;
READ_LITERAL_INDEX (value_index);
@@ -634,6 +668,7 @@ vm_init_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
}
else
{
is_immutable_binding = (self_reference == literal_start_p[value_index]);
lit_value = vm_construct_literal_object (frame_ctx_p,
literal_start_p[value_index]);
}
@@ -646,7 +681,7 @@ vm_init_loop (vm_frame_ctx_t *frame_ctx_p) /**< frame context */
{
ecma_string_t *name_p = ecma_get_string_from_value (literal_start_p[literal_index]);
if (likely (value_index < register_end || self_reference != literal_start_p[value_index]))
if (likely (!is_immutable_binding))
{
vm_var_decl (frame_ctx_p, name_p);