1 #include "jemalloc/internal/jemalloc_preamble.h" 2 #include "jemalloc/internal/jemalloc_internal_includes.h" 3 4 #include "jemalloc/internal/log.h" 5 6 char log_var_names[JEMALLOC_LOG_VAR_BUFSIZE]; 7 atomic_b_t log_init_done = ATOMIC_INIT(false); 8 9 /* 10 * Returns true if we were able to pick out a segment. Fills in r_segment_end 11 * with a pointer to the first character after the end of the string. 12 */ 13 static const char * 14 log_var_extract_segment(const char* segment_begin) { 15 const char *end; 16 for (end = segment_begin; *end != '\0' && *end != '|'; end++) { 17 } 18 return end; 19 } 20 21 static bool 22 log_var_matches_segment(const char *segment_begin, const char *segment_end, 23 const char *log_var_begin, const char *log_var_end) { 24 assert(segment_begin <= segment_end); 25 assert(log_var_begin < log_var_end); 26 27 ptrdiff_t segment_len = segment_end - segment_begin; 28 ptrdiff_t log_var_len = log_var_end - log_var_begin; 29 /* The special '.' segment matches everything. */ 30 if (segment_len == 1 && *segment_begin == '.') { 31 return true; 32 } 33 if (segment_len == log_var_len) { 34 return strncmp(segment_begin, log_var_begin, segment_len) == 0; 35 } else if (segment_len < log_var_len) { 36 return strncmp(segment_begin, log_var_begin, segment_len) == 0 37 && log_var_begin[segment_len] == '.'; 38 } else { 39 return false; 40 } 41 } 42 43 unsigned 44 log_var_update_state(log_var_t *log_var) { 45 const char *log_var_begin = log_var->name; 46 const char *log_var_end = log_var->name + strlen(log_var->name); 47 48 /* Pointer to one before the beginning of the current segment. */ 49 const char *segment_begin = log_var_names; 50 51 /* 52 * If log_init done is false, we haven't parsed the malloc conf yet. To 53 * avoid log-spew, we default to not displaying anything. 54 */ 55 if (!atomic_load_b(&log_init_done, ATOMIC_ACQUIRE)) { 56 return LOG_INITIALIZED_NOT_ENABLED; 57 } 58 59 while (true) { 60 const char *segment_end = log_var_extract_segment( 61 segment_begin); 62 assert(segment_end < log_var_names + JEMALLOC_LOG_VAR_BUFSIZE); 63 if (log_var_matches_segment(segment_begin, segment_end, 64 log_var_begin, log_var_end)) { 65 atomic_store_u(&log_var->state, LOG_ENABLED, 66 ATOMIC_RELAXED); 67 return LOG_ENABLED; 68 } 69 if (*segment_end == '\0') { 70 /* Hit the end of the segment string with no match. */ 71 atomic_store_u(&log_var->state, 72 LOG_INITIALIZED_NOT_ENABLED, ATOMIC_RELAXED); 73 return LOG_INITIALIZED_NOT_ENABLED; 74 } 75 /* Otherwise, skip the delimiter and continue. */ 76 segment_begin = segment_end + 1; 77 } 78 } 79