nir/spirv: Bring back the spirv2nir helper binary

This was something that I wrote in the early days of the spirv_to_nir code
but deleted once we had a real driver.  However, in the absence of a
shader_runner equivalent, it's extremely useful for debugging the
spirv_to_nir code so let's bring it back.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>

src/compiler/Makefile.nir.am

@@ -53,6 +53,24 @@ nir/nir_opt_algebraic.c: nir/nir_opt_algebraic.py nir/nir_algebraic.py
 	$(MKDIR_GEN)
 	$(PYTHON_GEN) $(srcdir)/nir/nir_opt_algebraic.py > $@ || ($(RM) $@; false)
 
+noinst_PROGRAMS += spirv2nir
+
+spirv2nir_SOURCES = \
+	spirv/spirv2nir.c
+
+spirv2nir_CPPFLAGS =					\
+	$(AM_CPPFLAGS)					\
+	-I$(top_builddir)/src/compiler/nir		\
+	-I$(top_srcdir)/src/compiler/nir		\
+	-I$(top_srcdir)/src/compiler/spirv
+
+spirv2nir_LDADD =					\
+	nir/libnir.la					\
+	$(top_builddir)/src/util/libmesautil.la		\
+	-lm						\
+	$(PTHREAD_LIBS)
+
+nodist_EXTRA_spirv2nir_SOURCES = dummy.cpp
 
 check_PROGRAMS += nir/tests/control_flow_tests
 

src/compiler/spirv/spirv2nir.c

@@ -0,0 +1,55 @@
+/*
+ * Copyright © 2015 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 (jason@jlekstrand.net)
+ *
+ */
+
+/*
+ * A simple executable that opens a SPIR-V shader, converts it to NIR, and
+ * dumps out the result.  This should be useful for testing the
+ * spirv_to_nir code.
+ */
+
+#include "spirv/nir_spirv.h"
+
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main(int argc, char **argv)
+{
+   int fd = open(argv[1], O_RDONLY);
+   off_t len = lseek(fd, 0, SEEK_END);
+
+   assert(len % 4 == 0);
+   size_t word_count = len / 4;
+
+   const void *map = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
+   assert(map != NULL);
+
+   nir_function *func = spirv_to_nir(map, word_count, NULL, 0,
+                                     MESA_SHADER_FRAGMENT, "main", NULL);
+   nir_print_shader(func->shader, stderr);
+}