diff options
Diffstat (limited to 'lib/monoucha0/monoucha/qjs/libregexp.c')
| -rw-r--r-- | lib/monoucha0/monoucha/qjs/libregexp.c | 36 |
1 files changed, 30 insertions, 6 deletions
diff --git a/lib/monoucha0/monoucha/qjs/libregexp.c b/lib/monoucha0/monoucha/qjs/libregexp.c index 693acbbf..da79dedb 100644 --- a/lib/monoucha0/monoucha/qjs/libregexp.c +++ b/lib/monoucha0/monoucha/qjs/libregexp.c @@ -53,6 +53,9 @@ typedef enum { #define CAPTURE_COUNT_MAX 255 #define STACK_SIZE_MAX 255 +/* must be large enough to have a negligible runtime cost and small + enough to call the interrupt callback often. */ +#define INTERRUPT_COUNTER_INIT 10000 /* unicode code points */ #define CP_LS 0x2028 @@ -2012,6 +2015,7 @@ typedef struct { bool multi_line; bool ignore_case; bool is_unicode; + int interrupt_counter; void *opaque; /* used for stack overflow check */ size_t state_size; @@ -2058,7 +2062,17 @@ static int push_state(REExecContext *s, return 0; } -/* return 1 if match, 0 if not match or -1 if error. */ +static int lre_poll_timeout(REExecContext *s) +{ + if (unlikely(--s->interrupt_counter <= 0)) { + s->interrupt_counter = INTERRUPT_COUNTER_INIT; + if (lre_check_timeout(s->opaque)) + return LRE_RET_TIMEOUT; + } + return 0; +} + +/* return 1 if match, 0 if not match or < 0 if error. */ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture, StackInt *stack, int stack_len, const uint8_t *pc, const uint8_t *cptr, @@ -2089,6 +2103,8 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture, ret = 0; recurse: for(;;) { + if (lre_poll_timeout(s)) + return LRE_RET_TIMEOUT; if (s->state_stack_len == 0) return ret; rs = (REExecState *)(s->state_stack + @@ -2182,7 +2198,7 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture, ret = push_state(s, capture, stack, stack_len, pc1, cptr, RE_EXEC_STATE_SPLIT, 0); if (ret < 0) - return -1; + return LRE_RET_MEMORY_ERROR; break; } case REOP_lookahead: @@ -2194,12 +2210,14 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture, RE_EXEC_STATE_LOOKAHEAD + opcode - REOP_lookahead, 0); if (ret < 0) - return -1; + return LRE_RET_MEMORY_ERROR; break; case REOP_goto: val = get_u32(pc); pc += 4 + (int)val; + if (lre_poll_timeout(s)) + return LRE_RET_TIMEOUT; break; case REOP_line_start: if (cptr == s->cbuf) @@ -2264,6 +2282,8 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture, pc += 4; if (--stack[stack_len - 1] != 0) { pc += (int)val; + if (lre_poll_timeout(s)) + return LRE_RET_TIMEOUT; } break; case REOP_push_char_pos: @@ -2438,9 +2458,12 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture, q = 0; for(;;) { + if (lre_poll_timeout(s)) + return LRE_RET_TIMEOUT; res = lre_exec_backtrack(s, capture, stack, stack_len, pc1, cptr, true); - if (res == -1) + if (res == LRE_RET_MEMORY_ERROR || + res == LRE_RET_TIMEOUT) return res; if (!res) break; @@ -2458,7 +2481,7 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture, RE_EXEC_STATE_GREEDY_QUANT, q - quant_min); if (ret < 0) - return -1; + return LRE_RET_MEMORY_ERROR; } } break; @@ -2468,7 +2491,7 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture, } } -/* Return 1 if match, 0 if not match or -1 if error. cindex is the +/* Return 1 if match, 0 if not match or < 0 if error (see LRE_RET_x). cindex is the starting position of the match and must be such as 0 <= cindex <= clen. */ int lre_exec(uint8_t **capture, @@ -2492,6 +2515,7 @@ int lre_exec(uint8_t **capture, s->cbuf_type = cbuf_type; if (s->cbuf_type == 1 && s->is_unicode) s->cbuf_type = 2; + s->interrupt_counter = INTERRUPT_COUNTER_INIT; s->opaque = opaque; s->state_size = sizeof(REExecState) + |