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Implement direct strings. (#2196)

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Direct strings are a new type of direct ecma-values (no memory allocation
is needed for encoding them) in JerryScript. Currently magic strings,
external magic strings and uint values are encoded as direct strings.

The constant pool of JerryScript byte-code is changed to hold ecma-values
rather than cpointers to support direct strings.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2018-02-23 00:21:46 +01:00
committed by yichoi
parent fbf5c32747
commit 51e3c4455a
37 changed files with 1493 additions and 1148 deletions
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jerry-core/ecma/base/ecma-helpers-value.c
+18 -3
View File
@@ -296,6 +296,9 @@ ecma_is_value_number (ecma_value_t value) /**< ecma value */
|| ecma_is_value_float_number (value));
} /* ecma_is_value_number */
JERRY_STATIC_ASSERT ((ECMA_TYPE_STRING | 0x4) == ECMA_TYPE_DIRECT_STRING,
ecma_type_string_and_direct_string_must_have_one_bit_difference);
/**
* Check if the value is ecma-string.
*
@@ -305,7 +308,7 @@ ecma_is_value_number (ecma_value_t value) /**< ecma value */
inline bool __attr_const___ __attr_always_inline___
ecma_is_value_string (ecma_value_t value) /**< ecma value */
{
return (ecma_get_value_type_field (value) == ECMA_TYPE_STRING);
return ((value & (ECMA_VALUE_TYPE_MASK - 0x4)) == ECMA_TYPE_STRING);
} /* ecma_is_value_string */
/**
@@ -503,6 +506,11 @@ ecma_make_string_value (const ecma_string_t *ecma_string_p) /**< string to refer
{
JERRY_ASSERT (ecma_string_p != NULL);
if ((((uintptr_t) ecma_string_p) & ECMA_VALUE_TYPE_MASK) != 0)
{
return (ecma_value_t) (uintptr_t) ecma_string_p;
}
return ecma_pointer_to_ecma_value (ecma_string_p) | ECMA_TYPE_STRING;
} /* ecma_make_string_value */
@@ -594,7 +602,12 @@ ecma_get_number_from_value (ecma_value_t value) /**< ecma value */
inline ecma_string_t *__attr_pure___ __attr_always_inline___
ecma_get_string_from_value (ecma_value_t value) /**< ecma value */
{
JERRY_ASSERT (ecma_get_value_type_field (value) == ECMA_TYPE_STRING);
JERRY_ASSERT (ecma_is_value_string (value));
if ((value & ECMA_VALUE_TYPE_MASK) == ECMA_TYPE_DIRECT_STRING)
{
return (ecma_string_t *) (uintptr_t) value;
}
return (ecma_string_t *) ecma_get_pointer_from_ecma_value (value);
} /* ecma_get_string_from_value */
@@ -607,7 +620,7 @@ ecma_get_string_from_value (ecma_value_t value) /**< ecma value */
inline ecma_object_t *__attr_pure___ __attr_always_inline___
ecma_get_object_from_value (ecma_value_t value) /**< ecma value */
{
JERRY_ASSERT (ecma_get_value_type_field (value) == ECMA_TYPE_OBJECT);
JERRY_ASSERT (ecma_is_value_object (value));
return (ecma_object_t *) ecma_get_pointer_from_ecma_value (value);
} /* ecma_get_object_from_value */
@@ -666,6 +679,7 @@ ecma_copy_value (ecma_value_t value) /**< value description */
switch (ecma_get_value_type_field (value))
{
case ECMA_TYPE_DIRECT:
case ECMA_TYPE_DIRECT_STRING:
{
return value;
}
@@ -856,6 +870,7 @@ ecma_free_value (ecma_value_t value) /**< value description */
switch (ecma_get_value_type_field (value))
{
case ECMA_TYPE_DIRECT:
case ECMA_TYPE_DIRECT_STRING:
{
/* no memory is allocated */
break;