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
@@ -13,6 +13,7 @@
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* limitations under the License.
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*/
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#include "lit-id-hash-table.h"
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#include "serializer.h"
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#include "bytecode-data.h"
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#include "pretty-printer.h"
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@@ -343,3 +344,152 @@ serializer_free (void)
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mem_heap_free_block (header_p);
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}
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}
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#ifdef JERRY_ENABLE_SNAPSHOT
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/**
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* Dump byte-code and idx-to-literal map to snapshot
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*
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* @return true, upon success (i.e. buffer size is enough),
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* false - otherwise.
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*/
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bool
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serializer_dump_bytecode_with_idx_map (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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const bytecode_data_header_t *bytecode_data_p, /**< byte-code data */
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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, /**< literals number */
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uint32_t *out_bytecode_size_p, /**< out: size of dumped instructions array */
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uint32_t *out_idx_to_lit_map_size_p) /**< out: side of dumped
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* idx to literals map */
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{
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JERRY_ASSERT (bytecode_data_p->next_header_cp == MEM_CP_NULL);
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vm_instr_counter_t instrs_num = bytecode_data_p->instrs_count;
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const size_t instrs_array_size = sizeof (vm_instr_t) * instrs_num;
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if (*in_out_buffer_offset_p + instrs_array_size > buffer_size)
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{
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return false;
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}
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memcpy (buffer_p + *in_out_buffer_offset_p, bytecode_data_p->instrs_p, instrs_array_size);
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*in_out_buffer_offset_p += instrs_array_size;
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*out_bytecode_size_p = (uint32_t) (sizeof (vm_instr_t) * instrs_num);
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lit_id_hash_table *lit_id_hash_p = MEM_CP_GET_POINTER (lit_id_hash_table, bytecode_data_p->lit_id_hash_cp);
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uint32_t idx_to_lit_map_size = lit_id_hash_table_dump_for_snapshot (buffer_p,
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buffer_size,
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in_out_buffer_offset_p,
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lit_id_hash_p,
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lit_map_p,
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literals_num,
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instrs_num);
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if (idx_to_lit_map_size == 0)
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{
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return false;
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}
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else
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{
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*out_idx_to_lit_map_size_p = idx_to_lit_map_size;
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return true;
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}
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} /* serializer_dump_bytecode_with_idx_map */
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/**
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* Register bytecode and idx map from snapshot
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*
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* NOTE:
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* If is_copy flag is set, bytecode is copied from snapshot, else bytecode is referenced directly
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* from snapshot
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*
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* @return pointer to byte-code header, upon success,
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* NULL - upon failure (i.e., in case snapshot format is not valid)
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*/
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const bytecode_data_header_t *
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serializer_load_bytecode_with_idx_map (const uint8_t *bytecode_and_idx_map_p, /**< buffer with instructions array
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* and idx to literals map from
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* snapshot */
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uint32_t bytecode_size, /**< size of instructions array */
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uint32_t idx_to_lit_map_size, /**< size of the idx to literals 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 */
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bool is_copy) /** flag, indicating whether the passed in-snapshot data
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* should be copied to engine's memory (true),
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* or it can be referenced until engine is stopped
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* (i.e. until call to jerry_cleanup) */
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{
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const uint8_t *idx_to_lit_map_p = bytecode_and_idx_map_p + bytecode_size;
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size_t instructions_number = bytecode_size / sizeof (vm_instr_t);
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size_t blocks_count = JERRY_ALIGNUP (instructions_number, BLOCK_SIZE) / BLOCK_SIZE;
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uint32_t idx_num_total;
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size_t idx_to_lit_map_offset = 0;
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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_total))
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{
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return NULL;
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}
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const size_t bytecode_alloc_size = JERRY_ALIGNUP (bytecode_size, MEM_ALIGNMENT);
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const size_t hash_table_size = lit_id_hash_table_get_size_for_table (idx_num_total, blocks_count);
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const size_t header_and_hash_table_size = JERRY_ALIGNUP (sizeof (bytecode_data_header_t) + hash_table_size,
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MEM_ALIGNMENT);
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const size_t alloc_size = header_and_hash_table_size + (is_copy ? bytecode_alloc_size : 0);
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uint8_t *buffer_p = (uint8_t*) mem_heap_alloc_block (alloc_size, MEM_HEAP_ALLOC_LONG_TERM);
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bytecode_data_header_t *header_p = (bytecode_data_header_t *) buffer_p;
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vm_instr_t *instrs_p;
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vm_instr_t *snapshot_instrs_p = (vm_instr_t *) bytecode_and_idx_map_p;
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if (is_copy)
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{
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instrs_p = (vm_instr_t *) (buffer_p + header_and_hash_table_size);
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memcpy (instrs_p, snapshot_instrs_p, bytecode_size);
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}
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else
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{
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instrs_p = snapshot_instrs_p;
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}
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uint8_t *lit_id_hash_table_buffer_p = buffer_p + sizeof (bytecode_data_header_t);
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if (lit_id_hash_table_load_from_snapshot (blocks_count,
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idx_num_total,
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idx_to_lit_map_p + idx_to_lit_map_offset,
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idx_to_lit_map_size - idx_to_lit_map_offset,
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lit_map_p,
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literals_num,
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lit_id_hash_table_buffer_p,
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hash_table_size)
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&& (vm_instr_counter_t) instructions_number == instructions_number)
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{
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MEM_CP_SET_NON_NULL_POINTER (header_p->lit_id_hash_cp, lit_id_hash_table_buffer_p);
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header_p->instrs_p = instrs_p;
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header_p->instrs_count = (vm_instr_counter_t) instructions_number;
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MEM_CP_SET_POINTER (header_p->next_header_cp, first_bytecode_header_p);
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first_bytecode_header_p = header_p;
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return header_p;
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}
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else
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{
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mem_heap_free_block (buffer_p);
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return NULL;
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}
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} /* serializer_load_bytecode_with_idx_map */
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#endif /* JERRY_ENABLE_SNAPSHOT */
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