Implement snapshot functionality.
JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com JerryScript-DCO-1.0-Signed-off-by: Andrey Shitov a.shitov@samsung.com
This commit is contained in:
Andrey Shitov
committed by
Ruben Ayrapetyan
Ruben Ayrapetyan
parent
7481fb606f
commit
311cc65b33
@@ -14,6 +14,7 @@
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*/
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#include "lit-id-hash-table.h"
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#include "lit-literal-storage.h"
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#include "bytecode-data.h"
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/** \addtogroup jsparser ECMAScript parser
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@@ -122,6 +123,203 @@ lit_id_hash_table_lookup (lit_id_hash_table *table_p, /**< table's header */
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return table_p->buckets[block_id][uid];
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} /* lit_id_hash_table_lookup */
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/**
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* Dump literal identifiers hash table to snapshot buffer
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*
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* @return number of bytes dumper - upon success,
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* 0 - upon failure
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*/
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uint32_t
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lit_id_hash_table_dump_for_snapshot (uint8_t *buffer_p, /**< buffer to dump to */
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size_t buffer_size, /**< buffer size */
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size_t *in_out_buffer_offset_p, /**< in-out: buffer write offset */
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lit_id_hash_table *table_p, /**< hash table to dump */
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const lit_mem_to_snapshot_id_map_entry_t *lit_map_p, /**< map from literal
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* identifiers in
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* literal storage
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* to literal offsets
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* in snapshot */
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uint32_t literals_num, /**< number of literals */
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vm_instr_counter_t instrs_num) /**< number of instructions in corresponding
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* byte-code array */
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{
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size_t begin_offset = *in_out_buffer_offset_p;
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uint32_t idx_num_total = (uint32_t) table_p->current_bucket_pos;
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JERRY_ASSERT (idx_num_total == table_p->current_bucket_pos);
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if (!jrt_write_to_buffer_by_offset (buffer_p, buffer_size, in_out_buffer_offset_p, idx_num_total))
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{
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return 0;
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}
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size_t blocks_num = JERRY_ALIGNUP (instrs_num, BLOCK_SIZE) / BLOCK_SIZE;
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for (size_t block_index = 0, next_block_index;
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block_index < blocks_num;
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)
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{
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uint32_t idx_num_in_block;
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next_block_index = block_index + 1u;
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while (next_block_index < blocks_num
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&& table_p->buckets[next_block_index] == NULL)
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{
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next_block_index++;
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}
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if (next_block_index != blocks_num)
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{
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idx_num_in_block = (uint32_t) (table_p->buckets[next_block_index] - table_p->buckets[block_index]);
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}
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else if (table_p->buckets[block_index] != NULL)
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{
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idx_num_in_block = (uint32_t) (table_p->current_bucket_pos
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- (size_t) (table_p->buckets[block_index] - table_p->buckets[0]));
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}
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else
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{
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idx_num_in_block = 0;
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}
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if (!jrt_write_to_buffer_by_offset (buffer_p, buffer_size, in_out_buffer_offset_p, idx_num_in_block))
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{
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return 0;
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}
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for (size_t block_idx_pair_index = 0;
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block_idx_pair_index < idx_num_in_block;
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block_idx_pair_index++)
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{
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lit_cpointer_t lit_cp = table_p->buckets[block_index][block_idx_pair_index];
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uint32_t lit_index;
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for (lit_index = 0; lit_index < literals_num; lit_index++)
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{
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if (lit_map_p[lit_index].literal_id.packed_value == lit_cp.packed_value)
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{
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break;
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}
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}
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JERRY_ASSERT (lit_index < literals_num);
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uint32_t offset = lit_map_p[lit_index].literal_offset;
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if (!jrt_write_to_buffer_by_offset (buffer_p, buffer_size, in_out_buffer_offset_p, offset))
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{
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return 0;
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}
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}
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while (++block_index < next_block_index)
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{
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idx_num_in_block = 0;
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if (!jrt_write_to_buffer_by_offset (buffer_p, buffer_size, in_out_buffer_offset_p, idx_num_in_block))
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{
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return 0;
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}
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}
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}
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size_t bytes_written = (*in_out_buffer_offset_p - begin_offset);
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JERRY_ASSERT (bytes_written == (uint32_t) bytes_written);
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return (uint32_t) bytes_written;
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} /* lit_id_hash_table_dump_for_snapshot */
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/**
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* Load literal identifiers hash table from specified snapshot buffer
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*
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* @return true - upon successful load (i.e. data in snapshot is consistent),
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* false - upon failure (in case, snapshot is incorrect)
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*/
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bool
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lit_id_hash_table_load_from_snapshot (size_t blocks_count, /**< number of byte-code blocks
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* in corresponding byte-code array */
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uint32_t idx_num_total, /**< total number of (byte-code block, idx)
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* pairs in snapshot */
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const uint8_t *idx_to_lit_map_p, /**< idx-to-lit map in snapshot */
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size_t idx_to_lit_map_size, /**< size of the map */
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const lit_mem_to_snapshot_id_map_entry_t *lit_map_p, /**< map of in-snapshot
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* literal offsets
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* to literal identifiers,
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* created in literal
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* storage */
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uint32_t literals_num, /**< number of literals in snapshot */
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uint8_t *buffer_for_hash_table_p, /**< buffer to initialize hash table in */
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size_t buffer_for_hash_table_size) /**< size of the buffer */
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{
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lit_id_hash_table *hash_table_p = lit_id_hash_table_init (buffer_for_hash_table_p,
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buffer_for_hash_table_size,
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idx_num_total,
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blocks_count);
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size_t idx_to_lit_map_offset = 0;
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uint32_t idx_num_counter = 0;
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for (size_t block_idx = 0; block_idx < blocks_count; block_idx++)
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{
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uint32_t idx_num_in_block;
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if (!jrt_read_from_buffer_by_offset (idx_to_lit_map_p,
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idx_to_lit_map_size,
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&idx_to_lit_map_offset,
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&idx_num_in_block))
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{
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return false;
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}
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hash_table_p->buckets[block_idx] = hash_table_p->raw_buckets + hash_table_p->current_bucket_pos;
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if (idx_num_counter + idx_num_in_block < idx_num_counter)
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{
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return false;
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}
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idx_num_counter += idx_num_in_block;
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if (idx_num_counter > idx_num_total)
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{
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return false;
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}
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for (uint32_t idx_in_block = 0; idx_in_block < idx_num_in_block; idx_in_block++)
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{
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uint32_t lit_offset_from_snapshot;
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if (!jrt_read_from_buffer_by_offset (idx_to_lit_map_p,
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idx_to_lit_map_size,
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&idx_to_lit_map_offset,
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&lit_offset_from_snapshot))
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{
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return false;
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}
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/**
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* TODO: implement binary search here
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*/
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lit_cpointer_t lit_cp = lit_cpointer_t::null_cp ();
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uint32_t i;
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for (i = 0; i < literals_num; i++)
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{
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if (lit_map_p[i].literal_offset == lit_offset_from_snapshot)
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{
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lit_cp.packed_value = lit_map_p[i].literal_id.packed_value;
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break;
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}
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}
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if (i == literals_num)
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{
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return false;
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}
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JERRY_ASSERT (hash_table_p->current_bucket_pos < idx_num_total);
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hash_table_p->raw_buckets[hash_table_p->current_bucket_pos++] = lit_cp;
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}
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}
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return true;
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} /* lit_id_hash_table_load_from_snapshot */
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/**
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* @}
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* @}
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