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#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;
}
}
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