glsl: Create a standalone executable for testing optimization passes.

This patch adds a new build artifact, glsl_test, which can be used for
testing optimization passes in isolation.

I'm hoping that we will be able to add other useful standalone tests
to this executable in the future.  Accordingly, it is built in a
modular fashion: the main() function uses its first argument to
determine which test function to invoke, removes that argument from
argv[], and then calls that function to interpret the rest of the
command line arguments and perform the test.  Currently the only test
function is "optpass", which tests optimization passes.

1 files changed, 78 insertions, 0 deletions

diff --git a/src/glsl/test.cpp b/src/glsl/test.cpp
new file mode 100644
index 00000000000..b1ff92ed1d4
--- /dev/null
+++ b/src/glsl/test.cpp
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2011 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.
+ */
+
+/**
+ * \file test.cpp
+ *
+ * Standalone tests for the GLSL compiler.
+ *
+ * This file provides a standalone executable which can be used to
+ * test components of the GLSL.
+ *
+ * Each test is a function with the same signature as main().  The
+ * main function interprets its first argument as the name of the test
+ * to run, strips out that argument, and then calls the test function.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "test_optpass.h"
+
+/**
+ * Print proper usage and exit with failure.
+ */
+static void
+usage_fail(const char *name)
+{
+   printf("*** usage: %s <command> <options>\n", name);
+   printf("\n");
+   printf("Possible commands are:\n");
+   printf("  optpass: test an optimization pass in isolation\n");
+   exit(EXIT_FAILURE);
+}
+
+static const char *extract_command_from_argv(int *argc, char **argv)
+{
+   if (*argc < 2) {
+      usage_fail(argv[0]);
+   }
+   const char *command = argv[1];
+   --*argc;
+   memmove(&argv[1], &argv[2], (*argc) * sizeof(argv[1]));
+   return command;
+}
+
+int main(int argc, char **argv)
+{
+   const char *command = extract_command_from_argv(&argc, argv);
+   if (strcmp(command, "optpass") == 0) {
+      return test_optpass(argc, argv);
+   } else {
+      usage_fail(argv[0]);
+   }
+
+   /* Execution should never reach here. */
+   return EXIT_FAILURE;
+}