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py, lexer: Add allocation policy config; return NULL if can't allocate.

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This commit is contained in:
Damien George 2014-05-10 17:48:01 +01:00
parent 1b82e9af5c
commit e1199ecf10
2 changed files with 33 additions and 6 deletions
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29
py/lexer.c
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@ -210,8 +210,9 @@ STATIC void next_char(mp_lexer_t *lex) {
void indent_push(mp_lexer_t *lex, uint indent) {
if (lex->num_indent_level >= lex->alloc_indent_level) {
lex->indent_level = m_renew(uint16_t, lex->indent_level, lex->alloc_indent_level, lex->alloc_indent_level * 2);
lex->alloc_indent_level *= 2;
// TODO use m_renew_maybe and somehow indicate an error if it fails... probably by using MP_TOKEN_MEMORY_ERROR
lex->indent_level = m_renew(uint16_t, lex->indent_level, lex->alloc_indent_level, lex->alloc_indent_level + MP_ALLOC_LEXEL_INDENT_INC);
lex->alloc_indent_level += MP_ALLOC_LEXEL_INDENT_INC;
}
lex->indent_level[lex->num_indent_level++] = indent;
}
@ -696,7 +697,15 @@ STATIC void mp_lexer_next_token_into(mp_lexer_t *lex, mp_token_t *tok, bool firs
}
mp_lexer_t *mp_lexer_new(qstr src_name, void *stream_data, mp_lexer_stream_next_char_t stream_next_char, mp_lexer_stream_close_t stream_close) {
mp_lexer_t *lex = m_new(mp_lexer_t, 1);
mp_lexer_t *lex = m_new_maybe(mp_lexer_t, 1);
// check for memory allocation error
if (lex == NULL) {
if (stream_close) {
stream_close(stream_data);
}
return NULL;
}
lex->source_name = src_name;
lex->stream_data = stream_data;
@ -706,12 +715,20 @@ mp_lexer_t *mp_lexer_new(qstr src_name, void *stream_data, mp_lexer_stream_next_
lex->column = 1;
lex->emit_dent = 0;
lex->nested_bracket_level = 0;
lex->alloc_indent_level = 16;
lex->alloc_indent_level = MP_ALLOC_LEXER_INDENT_INIT;
lex->num_indent_level = 1;
lex->indent_level = m_new(uint16_t, lex->alloc_indent_level);
lex->indent_level[0] = 0;
lex->indent_level = m_new_maybe(uint16_t, lex->alloc_indent_level);
vstr_init(&lex->vstr, 32);
// check for memory allocation error
if (lex->indent_level == NULL || vstr_had_error(&lex->vstr)) {
mp_lexer_free(lex);
return NULL;
}
// store sentinel for first indentation level
lex->indent_level[0] = 0;
// preload characters
lex->chr0 = stream_next_char(stream_data);
lex->chr1 = stream_next_char(stream_data);

10
py/mpconfig.h
View File

@ -36,6 +36,16 @@
/*****************************************************************************/
/* Memory allocation policy */
// Initial amount for lexer indentation level
#ifndef MP_ALLOC_LEXER_INDENT_INIT
#define MP_ALLOC_LEXER_INDENT_INIT (10)
#endif
// Increment for lexer indentation level
#ifndef MP_ALLOC_LEXEL_INDENT_INC
#define MP_ALLOC_LEXEL_INDENT_INC (8)
#endif
// Initial amount for parse rule stack
#ifndef MP_ALLOC_PARSE_RULE_INIT
#define MP_ALLOC_PARSE_RULE_INIT (64)