1 files changed, 90 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_metadata.c b/src/compiler/nir/nir_metadata.c
new file mode 100644
index 00000000000..61aae73221e
--- /dev/null
+++ b/src/compiler/nir/nir_metadata.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Jason Ekstrand ([email protected])
+ */
+
+#include "nir.h"
+
+/*
+ * Handles management of the metadata.
+ */
+
+void
+nir_metadata_require(nir_function_impl *impl, nir_metadata required)
+{
+#define NEEDS_UPDATE(X) ((required & ~impl->valid_metadata) & (X))
+
+   if (NEEDS_UPDATE(nir_metadata_block_index))
+      nir_index_blocks(impl);
+   if (NEEDS_UPDATE(nir_metadata_dominance))
+      nir_calc_dominance_impl(impl);
+   if (NEEDS_UPDATE(nir_metadata_live_ssa_defs))
+      nir_live_ssa_defs_impl(impl);
+
+#undef NEEDS_UPDATE
+
+   impl->valid_metadata |= required;
+}
+
+void
+nir_metadata_preserve(nir_function_impl *impl, nir_metadata preserved)
+{
+   impl->valid_metadata &= preserved;
+}
+
+#ifdef DEBUG
+/**
+ * Make sure passes properly invalidate metadata (part 1).
+ *
+ * Call this before running a pass to set a bogus metadata flag, which will
+ * only be preserved if the pass forgets to call nir_metadata_preserve().
+ */
+void
+nir_metadata_set_validation_flag(nir_shader *shader)
+{
+   nir_foreach_function(shader, function) {
+      if (function->impl) {
+         function->impl->valid_metadata |= nir_metadata_not_properly_reset;
+      }
+   }
+}
+
+/**
+ * Make sure passes properly invalidate metadata (part 2).
+ *
+ * Call this after a pass makes progress to verify that the bogus metadata set by
+ * the earlier function was properly thrown away.  Note that passes may not call
+ * nir_metadata_preserve() if they don't actually make any changes at all.
+ */
+void
+nir_metadata_check_validation_flag(nir_shader *shader)
+{
+   nir_foreach_function(shader, function) {
+      if (function->impl) {
+         assert(!(function->impl->valid_metadata &
+                  nir_metadata_not_properly_reset));
+      }
+   }
+}
+#endif