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/* Copyright JS Foundation and other contributors, http://js.foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ecma-gc.h"
#include "ecma-globals.h"
#include "ecma-helpers.h"
#include "ecma-lcache.h"
#include "jcontext.h"
/** \addtogroup ecma ECMA
* @{
*
* \addtogroup ecmalcache Property lookup cache
* @{
*/
#ifndef CONFIG_ECMA_LCACHE_DISABLE
/**
* Mask for hash bits
*/
#define ECMA_LCACHE_HASH_MASK (ECMA_LCACHE_HASH_ROWS_COUNT - 1)
#endif /* !CONFIG_ECMA_LCACHE_DISABLE */
/**
* Initialize LCache
*/
void
ecma_lcache_init (void)
{
#ifndef CONFIG_ECMA_LCACHE_DISABLE
memset (JERRY_HASH_TABLE_CONTEXT (table), 0, sizeof (jerry_hash_table_t));
#endif /* !CONFIG_ECMA_LCACHE_DISABLE */
} /* ecma_lcache_init */
#ifndef CONFIG_ECMA_LCACHE_DISABLE
/**
* Invalidate specified LCache entry
*/
static inline void JERRY_ATTR_ALWAYS_INLINE
ecma_lcache_invalidate_entry (ecma_lcache_hash_entry_t *entry_p) /**< entry to invalidate */
{
JERRY_ASSERT (entry_p != NULL);
JERRY_ASSERT (entry_p->object_cp != ECMA_NULL_POINTER);
JERRY_ASSERT (entry_p->prop_p != NULL);
entry_p->object_cp = ECMA_NULL_POINTER;
ecma_set_property_lcached (entry_p->prop_p, false);
} /* ecma_lcache_invalidate_entry */
/**
* Compute the row index of object / property name pair
*
* @return row index
*/
static inline size_t JERRY_ATTR_ALWAYS_INLINE
ecma_lcache_row_index (jmem_cpointer_t object_cp, /**< compressed pointer to object */
lit_string_hash_t name_hash) /**< property name hash */
{
/* Randomize the hash of the property name with the object pointer using a xor operation,
* so properties of different objects with the same name can be cached effectively. */
return (size_t) ((name_hash ^ object_cp) & ECMA_LCACHE_HASH_MASK);
} /* ecma_lcache_row_index */
#endif /* !CONFIG_ECMA_LCACHE_DISABLE */
/**
* Insert an entry into LCache
*/
void
ecma_lcache_insert (ecma_object_t *object_p, /**< object */
jmem_cpointer_t name_cp, /**< property name */
ecma_property_t *prop_p) /**< property */
{
JERRY_ASSERT (object_p != NULL);
JERRY_ASSERT (prop_p != NULL && !ecma_is_property_lcached (prop_p));
JERRY_ASSERT (ECMA_PROPERTY_GET_TYPE (*prop_p) == ECMA_PROPERTY_TYPE_NAMEDDATA
|| ECMA_PROPERTY_GET_TYPE (*prop_p) == ECMA_PROPERTY_TYPE_NAMEDACCESSOR);
#ifndef CONFIG_ECMA_LCACHE_DISABLE
jmem_cpointer_t object_cp;
ECMA_SET_NON_NULL_POINTER (object_cp, object_p);
lit_string_hash_t name_hash = ecma_string_get_property_name_hash (*prop_p, name_cp);
size_t row_index = ecma_lcache_row_index (object_cp, name_hash);
ecma_lcache_hash_entry_t *entries_p = JERRY_HASH_TABLE_CONTEXT (table)[row_index];
uint32_t entry_index;
for (entry_index = 0; entry_index < ECMA_LCACHE_HASH_ROW_LENGTH; entry_index++)
{
if (entries_p[entry_index].object_cp == ECMA_NULL_POINTER)
{
break;
}
}
if (entry_index == ECMA_LCACHE_HASH_ROW_LENGTH)
{
/* Invalidate the last entry. */
ecma_lcache_invalidate_entry (entries_p + ECMA_LCACHE_HASH_ROW_LENGTH - 1);
/* Shift other entries towards the end. */
for (uint32_t i = ECMA_LCACHE_HASH_ROW_LENGTH - 1; i > 0; i--)
{
entries_p[i] = entries_p[i - 1];
}
entry_index = 0;
}
ecma_lcache_hash_entry_t *entry_p = entries_p + entry_index;
ECMA_SET_NON_NULL_POINTER (entry_p->object_cp, object_p);
entry_p->prop_name_cp = name_cp;
entry_p->prop_p = prop_p;
ecma_set_property_lcached (entry_p->prop_p, true);
#else /* CONFIG_ECMA_LCACHE_DISABLE */
JERRY_UNUSED (name_cp);
#endif /* !CONFIG_ECMA_LCACHE_DISABLE */
} /* ecma_lcache_insert */
#ifndef CONFIG_ECMA_LCACHE_DISABLE
#endif /* !CONFIG_ECMA_LCACHE_DISABLE */
/**
* Lookup property in the LCache
*
* @return a pointer to an ecma_property_t if the lookup is successful
* NULL otherwise
*/
inline ecma_property_t * JERRY_ATTR_ALWAYS_INLINE
ecma_lcache_lookup (ecma_object_t *object_p, /**< object */
const ecma_string_t *prop_name_p) /**< property's name */
{
JERRY_ASSERT (object_p != NULL);
JERRY_ASSERT (prop_name_p != NULL);
#ifndef CONFIG_ECMA_LCACHE_DISABLE
jmem_cpointer_t object_cp;
ECMA_SET_NON_NULL_POINTER (object_cp, object_p);
ecma_property_t prop_name_type;
jmem_cpointer_t prop_name_cp;
lit_string_hash_t name_hash;
if (ECMA_IS_DIRECT_STRING (prop_name_p))
{
prop_name_type = (ecma_property_t) ECMA_GET_DIRECT_STRING_TYPE (prop_name_p);
uintptr_t value = ECMA_GET_DIRECT_STRING_VALUE (prop_name_p);
prop_name_cp = (jmem_cpointer_t) value;
name_hash = (lit_string_hash_t) value;
if (prop_name_type == ECMA_DIRECT_STRING_MAGIC_EX)
{
name_hash = (lit_string_hash_t) (name_hash + LIT_MAGIC_STRING__COUNT);
}
}
else
{
prop_name_type = ECMA_DIRECT_STRING_PTR;
ECMA_SET_NON_NULL_POINTER (prop_name_cp, prop_name_p);
name_hash = prop_name_p->hash;
}
size_t row_index = ecma_lcache_row_index (object_cp, name_hash);
ecma_lcache_hash_entry_t *entry_p = JERRY_HASH_TABLE_CONTEXT (table) [row_index];
ecma_lcache_hash_entry_t *entry_end_p = entry_p + ECMA_LCACHE_HASH_ROW_LENGTH;
while (entry_p < entry_end_p)
{
if (entry_p->object_cp == object_cp
&& entry_p->prop_name_cp == prop_name_cp)
{
ecma_property_t *prop_p = entry_p->prop_p;
JERRY_ASSERT (prop_p != NULL && ecma_is_property_lcached (prop_p));
if (ECMA_PROPERTY_GET_NAME_TYPE (*prop_p) == prop_name_type)
{
return prop_p;
}
}
else
{
/* They can be equal, but generic string comparison is too costly. */
}
entry_p++;
}
#endif /* !CONFIG_ECMA_LCACHE_DISABLE */
return NULL;
} /* ecma_lcache_lookup */
/**
* Invalidate LCache entries associated with given object and property name / property
*/
void
ecma_lcache_invalidate (ecma_object_t *object_p, /**< object */
jmem_cpointer_t name_cp, /**< property name */
ecma_property_t *prop_p) /**< property */
{
JERRY_ASSERT (object_p != NULL);
JERRY_ASSERT (prop_p != NULL && ecma_is_property_lcached (prop_p));
JERRY_ASSERT (ECMA_PROPERTY_GET_TYPE (*prop_p) == ECMA_PROPERTY_TYPE_NAMEDDATA
|| ECMA_PROPERTY_GET_TYPE (*prop_p) == ECMA_PROPERTY_TYPE_NAMEDACCESSOR);
#ifndef CONFIG_ECMA_LCACHE_DISABLE
jmem_cpointer_t object_cp;
ECMA_SET_NON_NULL_POINTER (object_cp, object_p);
lit_string_hash_t name_hash = ecma_string_get_property_name_hash (*prop_p, name_cp);
size_t row_index = ecma_lcache_row_index (object_cp, name_hash);
ecma_lcache_hash_entry_t *entry_p = JERRY_HASH_TABLE_CONTEXT (table) [row_index];
while (true)
{
/* The property must be present. */
JERRY_ASSERT (entry_p - JERRY_HASH_TABLE_CONTEXT (table) [row_index] < ECMA_LCACHE_HASH_ROW_LENGTH);
if (entry_p->object_cp != ECMA_NULL_POINTER && entry_p->prop_p == prop_p)
{
JERRY_ASSERT (entry_p->object_cp == object_cp);
ecma_lcache_invalidate_entry (entry_p);
return;
}
entry_p++;
}
#else /* CONFIG_ECMA_LCACHE_DISABLE */
JERRY_UNUSED (name_cp);
#endif /* !CONFIG_ECMA_LCACHE_DISABLE */
} /* ecma_lcache_invalidate */
/**
* @}
* @}
*/
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