| #include "jemalloc/internal/jemalloc_preamble.h" |
| #include "jemalloc/internal/jemalloc_internal_includes.h" |
| |
| #include "jemalloc/internal/log.h" |
| |
| char log_var_names[JEMALLOC_LOG_VAR_BUFSIZE]; |
| atomic_b_t log_init_done = ATOMIC_INIT(false); |
| |
| /* |
| * Returns true if we were able to pick out a segment. Fills in r_segment_end |
| * with a pointer to the first character after the end of the string. |
| */ |
| static const char * |
| log_var_extract_segment(const char* segment_begin) { |
| const char *end; |
| for (end = segment_begin; *end != '\0' && *end != '|'; end++) { |
| } |
| return end; |
| } |
| |
| static bool |
| log_var_matches_segment(const char *segment_begin, const char *segment_end, |
| const char *log_var_begin, const char *log_var_end) { |
| assert(segment_begin <= segment_end); |
| assert(log_var_begin < log_var_end); |
| |
| ptrdiff_t segment_len = segment_end - segment_begin; |
| ptrdiff_t log_var_len = log_var_end - log_var_begin; |
| /* The special '.' segment matches everything. */ |
| if (segment_len == 1 && *segment_begin == '.') { |
| return true; |
| } |
| if (segment_len == log_var_len) { |
| return strncmp(segment_begin, log_var_begin, segment_len) == 0; |
| } else if (segment_len < log_var_len) { |
| return strncmp(segment_begin, log_var_begin, segment_len) == 0 |
| && log_var_begin[segment_len] == '.'; |
| } else { |
| return false; |
| } |
| } |
| |
| unsigned |
| log_var_update_state(log_var_t *log_var) { |
| const char *log_var_begin = log_var->name; |
| const char *log_var_end = log_var->name + strlen(log_var->name); |
| |
| /* Pointer to one before the beginning of the current segment. */ |
| const char *segment_begin = log_var_names; |
| |
| /* |
| * If log_init done is false, we haven't parsed the malloc conf yet. To |
| * avoid log-spew, we default to not displaying anything. |
| */ |
| if (!atomic_load_b(&log_init_done, ATOMIC_ACQUIRE)) { |
| return LOG_INITIALIZED_NOT_ENABLED; |
| } |
| |
| while (true) { |
| const char *segment_end = log_var_extract_segment( |
| segment_begin); |
| assert(segment_end < log_var_names + JEMALLOC_LOG_VAR_BUFSIZE); |
| if (log_var_matches_segment(segment_begin, segment_end, |
| log_var_begin, log_var_end)) { |
| atomic_store_u(&log_var->state, LOG_ENABLED, |
| ATOMIC_RELAXED); |
| return LOG_ENABLED; |
| } |
| if (*segment_end == '\0') { |
| /* Hit the end of the segment string with no match. */ |
| atomic_store_u(&log_var->state, |
| LOG_INITIALIZED_NOT_ENABLED, ATOMIC_RELAXED); |
| return LOG_INITIALIZED_NOT_ENABLED; |
| } |
| /* Otherwise, skip the delimiter and continue. */ |
| segment_begin = segment_end + 1; |
| } |
| } |