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Optimize reg_var_decl memory usage

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This commit is contained in:
Ilmir Usmanov 2014-07-24 16:54:59 +04:00
parent 389cd34bc0
commit c837c7d435
1 changed files with 31 additions and 19 deletions
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50
src/libjsparser/parser.c
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@ -25,7 +25,8 @@
static token tok;
static OPCODE opcode, opcodes_buffer[MAX_OPCODES];
static uint8_t current_opcode_in_buffer = 0;
static uint8_t opcode_counter = 0, sub_assignment_exprs = 0;
static uint8_t opcode_counter = 0;
static T_IDX temp_name_stack[MAX_OPCODES], temp_name_stack_head = 0, max_temp_name;
#ifdef __HOST
_FILE *debug_file;
@ -44,9 +45,25 @@ next_temp_name (void)
return temp_name++;
}
static void
start_new_scope (void)
{
JERRY_ASSERT (temp_name_stack_head < MAX_OPCODES);
temp_name_stack[temp_name_stack_head++] = temp_name;
max_temp_name = min_temp_name;
}
static void
finish_scope (void)
{
temp_name = temp_name_stack[--temp_name_stack_head];
}
static void
reset_temp_name (void)
{
if (max_temp_name < temp_name)
max_temp_name = temp_name;
temp_name = min_temp_name;
}
@ -1175,18 +1192,9 @@ parse_conditional_expression (bool *was_conditional)
static T_IDX
parse_assignment_expression (void)
{
T_IDX lhs, rhs, reg_var_decl_loc;
T_IDX lhs, rhs;
bool was_conditional = false;
if (!sub_assignment_exprs)
{
reset_temp_name ();
reg_var_decl_loc = opcode_counter;
DUMP_OPCODE (reg_var_decl, min_temp_name, INVALID_VALUE);
}
sub_assignment_exprs++;
lhs = parse_conditional_expression (&was_conditional);
if (was_conditional)
{
@ -1261,13 +1269,7 @@ parse_assignment_expression (void)
}
end:
sub_assignment_exprs--;
if (!sub_assignment_exprs)
{
REWRITE_OPCODE (reg_var_decl_loc, reg_var_decl, min_temp_name, (uint8_t) (temp_name - 1));
dump_saved_opcodes ();
}
dump_saved_opcodes ();
return lhs;
}
@ -1687,6 +1689,8 @@ parse_try_statement (void)
static void
parse_statement (void)
{
reset_temp_name ();
if (tok.type == TOK_CLOSE_BRACE)
{
lexer_save_token (tok);
@ -1815,12 +1819,20 @@ parse_source_element (void)
static void
parse_source_element_list (void)
{
T_IDX reg_var_decl_loc;
start_new_scope ();
reg_var_decl_loc = opcode_counter;
DUMP_OPCODE (reg_var_decl, min_temp_name, INVALID_VALUE);
while (tok.type != TOK_EOF && tok.type != TOK_CLOSE_BRACE)
{
parse_source_element ();
skip_newlines ();
}
lexer_save_token (tok);
REWRITE_OPCODE (reg_var_decl_loc, reg_var_decl, min_temp_name, (uint8_t) (max_temp_name - 1));
finish_scope ();
}
/* program
@ -1840,7 +1852,7 @@ parser_parse_program (void)
void
parser_init (void)
{
temp_name = min_temp_name = lexer_get_reserved_ids_count ();
max_temp_name = temp_name = min_temp_name = lexer_get_reserved_ids_count ();
#ifdef __HOST
debug_file = __fopen ("parser.log", "w");
#endif