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Merge pull request #552 from tannewt/flexible_parser

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Make parsing more memory flexible.
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Dan Halbert 2018-01-24 18:50:26 -08:00 committed by GitHub
commit 271c4bead6
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1 changed files with 21 additions and 2 deletions
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py/parse.c
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@ -742,11 +742,30 @@ mp_parse_tree_t mp_parse(mp_lexer_t *lex, mp_parse_input_kind_t input_kind) {
parser.rule_stack_alloc = MICROPY_ALLOC_PARSE_RULE_INIT;
parser.rule_stack_top = 0;
parser.rule_stack = m_new(rule_stack_t, parser.rule_stack_alloc);
parser.rule_stack = NULL;
while (parser.rule_stack_alloc > 1) {
parser.rule_stack = m_new_maybe(rule_stack_t, parser.rule_stack_alloc);
if (parser.rule_stack != NULL) {
break;
} else {
parser.rule_stack_alloc /= 2;
}
}
parser.result_stack_alloc = MICROPY_ALLOC_PARSE_RESULT_INIT;
parser.result_stack_top = 0;
parser.result_stack = m_new(mp_parse_node_t, parser.result_stack_alloc);
parser.result_stack = NULL;
while (parser.result_stack_alloc > 1) {
parser.result_stack = m_new_maybe(mp_parse_node_t, parser.result_stack_alloc);
if (parser.result_stack != NULL) {
break;
} else {
parser.result_stack_alloc /= 2;
}
}
if (parser.rule_stack == NULL || parser.result_stack == NULL) {
mp_raise_msg(&mp_type_MemoryError, "Unable to init parser");
}
parser.lexer = lex;