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