nir: add serialization and deserialization

v2 (Jason Ekstrand):
 - Various whitespace cleanups
 - Add helpers for reading/writing objects
 - Rework derefs
 - [de]serialize nir_shader::num_*
 - Fix uses of blob_reserve_bytes
 - Use a bitfield struct for packing tex_instr data

v3:
 - Zero nir_variable struct on deserialization. (Jordan)
 - Allow nir_serialize.h to be included in C++. (Jordan)
 - Handle NULL info.name. (Jason)
 - Set info.name to NULL when name is NULL. (Jordan)

Acked-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>

src/compiler/Makefile.sources

@@ -277,6 +277,8 @@ NIR_FILES = \
 	nir/nir_search.c \
 	nir/nir_search.h \
 	nir/nir_search_helpers.h \
+	nir/nir_serialize.c \
+	nir/nir_serialize.h \
 	nir/nir_split_var_copies.c \
 	nir/nir_sweep.c \
 	nir/nir_to_lcssa.c \

src/compiler/nir/meson.build

@@ -164,6 +164,8 @@ files_libnir = files(
   'nir_search.c',
   'nir_search.h',
   'nir_search_helpers.h',
+  'nir_serialize.c',
+  'nir_serialize.h',
   'nir_split_var_copies.c',
   'nir_sweep.c',
   'nir_to_lcssa.c',

src/compiler/nir/nir_serialize.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright © 2017 Connor Abbott
+ *
+ * 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.
+ */
+
+#ifndef _NIR_SERIALIZE_H
+#define _NIR_SERIALIZE_H
+
+#include "nir.h"
+#include "compiler/blob.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void nir_serialize(struct blob *blob, const nir_shader *nir);
+nir_shader *nir_deserialize(void *mem_ctx,
+                            const struct nir_shader_compiler_options *options,
+                            struct blob_reader *blob);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif