util: add disk_cache_get_function_identifier()

This can be used as a drop in replacement for
disk_cache_get_function_timestamp().

Here we use build-id to generate a driver-id rather than build
timestamp if available. This should resolve issues such as
distros using reproducable builds and flatpak not having
real build timestamps.

Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/util/disk_cache.h b/src/util/disk_cache.h
index c8685a53ed3..3129de8ec9d 100644
--- a/src/util/disk_cache.h
+++ b/src/util/disk_cache.h
@@ -27,6 +27,7 @@
 #ifdef HAVE_DLFCN_H
 #include <dlfcn.h>
 #include <stdio.h>
+#include "util/build_id.h"
 #endif
 #include <assert.h>
 #include <stdint.h>
@@ -112,6 +113,21 @@ disk_cache_get_function_timestamp(void *ptr, uint32_t* timestamp)
 
    return true;
 }
+
+static inline bool
+disk_cache_get_function_identifier(void *ptr, uint32_t *id)
+{
+#ifdef HAVE_DL_ITERATE_PHDR
+   const struct build_id_note *note = NULL;
+   if ((note = build_id_find_nhdr_for_addr(ptr))) {
+      const uint8_t *id_sha1 = build_id_data(note);
+      assert(id_sha1);
+      *id = *id_sha1;
+      return true;
+   } else
+#endif
+   return disk_cache_get_function_timestamp(ptr, id);
+}
 #endif
 
 /* Provide inlined stub functions if the shader cache is disabled. */