mirror of
https://github.com/jerryscript-project/jerryscript.git
synced 2025-12-15 16:29:21 +00:00
312 lines
9.0 KiB
C++
312 lines
9.0 KiB
C++
/* Copyright 2014-2015 Samsung Electronics Co., Ltd.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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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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#include "array-list.h"
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#include "scopes-tree.h"
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static bytecode_data_t bytecode_data;
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static scopes_tree current_scope;
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static bool print_instrs;
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static void
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serializer_print_instrs (const vm_instr_t *instrs_p,
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size_t instrs_count);
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op_meta
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serializer_get_op_meta (vm_instr_counter_t oc)
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{
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JERRY_ASSERT (current_scope);
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return scopes_tree_op_meta (current_scope, oc);
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}
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/**
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* Get variable declaration of the current scope
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*
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* @return variable declaration instruction
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*/
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op_meta
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serializer_get_var_decl (vm_instr_counter_t oc) /**< index of variable declaration */
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{
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JERRY_ASSERT (current_scope);
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return scopes_tree_var_decl (current_scope, oc);
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} /* serializer_get_var_decl */
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/**
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* Get byte-code instruction from current scope, or specified byte-code array
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*
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* @return byte-code instruction
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*/
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vm_instr_t
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serializer_get_instr (const vm_instr_t *instrs_p, /**< pointer to byte-code array (or NULL,
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* if instruction should be taken from
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* instruction list of current scope) */
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vm_instr_counter_t oc) /**< position of the intruction */
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{
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if (instrs_p == NULL)
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{
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return serializer_get_op_meta (oc).op;
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}
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else
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{
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JERRY_ASSERT (oc < GET_BYTECODE_HEADER (instrs_p)->instructions_number);
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return instrs_p[oc];
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}
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} /* serializer_get_instr */
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/**
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* Convert literal id (operand value of instruction) to compressed pointer to literal
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*
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* Bytecode is divided into blocks of fixed size and each block has independent encoding of variable names,
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* which are represented by 8 bit numbers - ids.
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* This function performs conversion from id to literal.
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*
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* @return compressed pointer to literal
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*/
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lit_cpointer_t
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serializer_get_literal_cp_by_uid (uint8_t id, /**< literal idx */
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const vm_instr_t *instrs_p, /**< pointer to bytecode */
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vm_instr_counter_t oc) /**< position in the bytecode */
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{
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lit_id_hash_table *lit_id_hash = GET_HASH_TABLE_FOR_BYTECODE (instrs_p == NULL ? bytecode_data.instrs_p : instrs_p);
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if (lit_id_hash == null_hash)
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{
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return INVALID_LITERAL;
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}
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return lit_id_hash_table_lookup (lit_id_hash, id, oc);
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} /* serializer_get_literal_cp_by_uid */
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void
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serializer_set_strings_buffer (const ecma_char_t *s)
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{
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bytecode_data.strings_buffer = s;
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}
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void
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serializer_set_scope (scopes_tree new_scope)
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{
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current_scope = new_scope;
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}
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/**
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* Dump scope to current scope
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*
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* NOTE:
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* This function is used for processing of function expressions as they should not be hoisted.
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* After parsing a function expression, it is immediately dumped to current scope via call of this function.
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*/
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void
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serializer_dump_subscope (scopes_tree tree) /**< scope to dump */
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{
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JERRY_ASSERT (tree != NULL);
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vm_instr_counter_t instr_pos;
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bool header = true;
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for (instr_pos = 0; instr_pos < tree->instrs_count; instr_pos++)
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{
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op_meta *om_p = (op_meta *) linked_list_element (tree->instrs, instr_pos);
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if (om_p->op.op_idx != VM_OP_VAR_DECL
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&& om_p->op.op_idx != VM_OP_META && !header)
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{
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break;
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}
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if (om_p->op.op_idx == VM_OP_REG_VAR_DECL)
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{
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header = false;
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}
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scopes_tree_add_op_meta (current_scope, *om_p);
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}
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for (vm_instr_counter_t var_decl_pos = 0; var_decl_pos < tree->var_decls_cout; var_decl_pos++)
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{
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op_meta *om_p = (op_meta *) linked_list_element (tree->var_decls, var_decl_pos);
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scopes_tree_add_op_meta (current_scope, *om_p);
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}
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for (uint8_t child_id = 0; child_id < tree->t.children_num; child_id++)
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{
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serializer_dump_subscope (*(scopes_tree *) linked_list_element (tree->t.children, child_id));
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}
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for (; instr_pos < tree->instrs_count; instr_pos++)
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{
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op_meta *om_p = (op_meta *) linked_list_element (tree->instrs, instr_pos);
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scopes_tree_add_op_meta (current_scope, *om_p);
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}
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} /* serializer_dump_subscope */
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const vm_instr_t *
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serializer_merge_scopes_into_bytecode (void)
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{
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bytecode_data.instrs_count = scopes_tree_count_instructions (current_scope);
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const size_t buckets_count = scopes_tree_count_literals_in_blocks (current_scope);
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const size_t blocks_count = (size_t) bytecode_data.instrs_count / BLOCK_SIZE + 1;
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const vm_instr_counter_t instrs_count = scopes_tree_count_instructions (current_scope);
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const size_t bytecode_array_size = JERRY_ALIGNUP (sizeof (insts_data_header_t) + instrs_count * sizeof (vm_instr_t),
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MEM_ALIGNMENT);
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const size_t lit_id_hash_table_size = JERRY_ALIGNUP (lit_id_hash_table_get_size_for_table (buckets_count,
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blocks_count),
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MEM_ALIGNMENT);
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uint8_t *buffer_p = (uint8_t*) mem_heap_alloc_block (bytecode_array_size + lit_id_hash_table_size,
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MEM_HEAP_ALLOC_LONG_TERM);
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lit_id_hash_table *lit_id_hash = lit_id_hash_table_init (buffer_p + bytecode_array_size,
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lit_id_hash_table_size,
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buckets_count, blocks_count);
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const vm_instr_t *instrs_p = scopes_tree_raw_data (current_scope, buffer_p, bytecode_array_size, lit_id_hash);
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insts_data_header_t *header_p = (insts_data_header_t*) buffer_p;
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MEM_CP_SET_POINTER (header_p->next_instrs_cp, bytecode_data.instrs_p);
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header_p->instructions_number = instrs_count;
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bytecode_data.instrs_p = instrs_p;
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if (print_instrs)
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{
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lit_dump_literals ();
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serializer_print_instrs (instrs_p, bytecode_data.instrs_count);
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}
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return instrs_p;
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}
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void
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serializer_dump_op_meta (op_meta op)
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{
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JERRY_ASSERT (scopes_tree_instrs_num (current_scope) < MAX_OPCODES);
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scopes_tree_add_op_meta (current_scope, op);
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#ifdef JERRY_ENABLE_PRETTY_PRINTER
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if (print_instrs)
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{
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pp_op_meta (NULL, (vm_instr_counter_t) (scopes_tree_instrs_num (current_scope) - 1), op, false);
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}
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#endif
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}
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/**
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* Dump variable declaration into the current scope
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*/
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void
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serializer_dump_var_decl (op_meta op) /**< variable declaration instruction */
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{
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JERRY_ASSERT (scopes_tree_instrs_num (current_scope) + current_scope->var_decls_cout < MAX_OPCODES);
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scopes_tree_add_var_decl (current_scope, op);
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} /* serializer_dump_var_decl */
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vm_instr_counter_t
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serializer_get_current_instr_counter (void)
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{
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return scopes_tree_instrs_num (current_scope);
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}
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/**
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* Get number of variable declarations in the current scope
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*
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* @return count of variable declarations
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*/
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vm_instr_counter_t
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serializer_get_current_var_decls_counter (void)
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{
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return scopes_tree_var_decls_num (current_scope);
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} /* serializer_get_current_var_decls_counter */
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vm_instr_counter_t
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serializer_count_instrs_in_subscopes (void)
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{
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return (vm_instr_counter_t) (scopes_tree_count_instructions (current_scope) - scopes_tree_instrs_num (current_scope));
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}
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void
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serializer_set_writing_position (vm_instr_counter_t oc)
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{
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scopes_tree_set_instrs_num (current_scope, oc);
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}
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void
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serializer_rewrite_op_meta (const vm_instr_counter_t loc, op_meta op)
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{
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scopes_tree_set_op_meta (current_scope, loc, op);
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#ifdef JERRY_ENABLE_PRETTY_PRINTER
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if (print_instrs)
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{
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pp_op_meta (NULL, loc, op, true);
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}
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#endif
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}
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static void
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serializer_print_instrs (const vm_instr_t *instrs_p,
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size_t instrs_count)
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{
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#ifdef JERRY_ENABLE_PRETTY_PRINTER
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for (vm_instr_counter_t loc = 0; loc < instrs_count; loc++)
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{
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op_meta opm;
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opm.op = instrs_p[loc];
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for (int i = 0; i < 3; i++)
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{
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opm.lit_id[i] = NOT_A_LITERAL;
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}
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pp_op_meta (instrs_p, loc, opm, false);
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}
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#else
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(void) instrs_p;
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(void) instrs_count;
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#endif
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}
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void
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serializer_init ()
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{
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current_scope = NULL;
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print_instrs = false;
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bytecode_data.strings_buffer = NULL;
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bytecode_data.instrs_p = NULL;
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lit_init ();
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}
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void serializer_set_show_instrs (bool show_instrs)
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{
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print_instrs = show_instrs;
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}
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void
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serializer_free (void)
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{
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if (bytecode_data.strings_buffer)
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{
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mem_heap_free_block ((uint8_t *) bytecode_data.strings_buffer);
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}
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lit_finalize ();
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while (bytecode_data.instrs_p != NULL)
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{
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insts_data_header_t *header_p = GET_BYTECODE_HEADER (bytecode_data.instrs_p);
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bytecode_data.instrs_p = MEM_CP_GET_POINTER (vm_instr_t, header_p->next_instrs_cp);
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mem_heap_free_block (header_p);
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}
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}
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