+/* WARNING: 3rd party applications might be reading the cache item metadata.
+ * Do not change these values without making the change widely known.
+ * Please contact Valve developers and make them aware of this change.
+ */
+#define CACHE_ITEM_TYPE_UNKNOWN 0x0
+#define CACHE_ITEM_TYPE_GLSL 0x1
+
+typedef void
+(*disk_cache_put_cb) (const void *key, signed long keySize,
+ const void *value, signed long valueSize);
+
+typedef signed long
+(*disk_cache_get_cb) (const void *key, signed long keySize,
+ void *value, signed long valueSize);
+
+struct cache_item_metadata {
+ /**
+ * The cache item type. This could be used to identify a GLSL cache item,
+ * a certain type of IR (tgsi, nir, etc), or signal that it is the final
+ * binary form of the shader.
+ */
+ uint32_t type;
+
+ /** GLSL cache item metadata */
+ cache_key *keys; /* sha1 list of shaders that make up the cache item */
+ uint32_t num_keys;
+};
+
+struct disk_cache;
+
+static inline char *
+disk_cache_format_hex_id(char *buf, const uint8_t *hex_id, unsigned size)
+{
+ static const char hex_digits[] = "0123456789abcdef";
+ unsigned i;
+
+ for (i = 0; i < size; i += 2) {
+ buf[i] = hex_digits[hex_id[i >> 1] >> 4];
+ buf[i + 1] = hex_digits[hex_id[i >> 1] & 0x0f];
+ }
+ buf[i] = '\0';
+
+ return buf;
+}
+
+#ifdef HAVE_DLADDR
+static inline bool
+disk_cache_get_function_timestamp(void *ptr, uint32_t* timestamp)
+{
+ Dl_info info;
+ struct stat st;
+ if (!dladdr(ptr, &info) || !info.dli_fname) {
+ return false;
+ }
+ if (stat(info.dli_fname, &st)) {
+ return false;
+ }
+
+ if (!st.st_mtime) {
+ fprintf(stderr, "Mesa: The provided filesystem timestamp for the cache "
+ "is bogus! Disabling On-disk cache.\n");
+ return false;
+ }
+
+ *timestamp = st.st_mtime;
+
+ return true;
+}
+
+static inline bool
+disk_cache_get_function_identifier(void *ptr, struct mesa_sha1 *ctx)
+{
+ uint32_t timestamp;
+
+#ifdef HAVE_DL_ITERATE_PHDR
+ const struct build_id_note *note = NULL;
+ if ((note = build_id_find_nhdr_for_addr(ptr))) {
+ _mesa_sha1_update(ctx, build_id_data(note), build_id_length(note));
+ } else
+#endif
+ if (disk_cache_get_function_timestamp(ptr, ×tamp)) {
+ _mesa_sha1_update(ctx, ×tamp, sizeof(timestamp));
+ } else
+ return false;
+ return true;
+}
+#endif
+