glsl: When constructing a variable with an interface type, set interface_type

Ever since the addition of interface blocks with instance names, we have
had an implicit invariant:

    var->type->is_interface() ==
        (var->type == var->interface_type)

The odd use of == here is intentional because !var->type->is_interface()
implies var->type != var->interface_type.

Further, if var->type->is_array() is true, we have a related implicit
invariant:

    var->type->fields.array->is_interface() ==
        (var->type->fields.array == var->interface_type)

However, the ir_variable constructor doesn't maintain either invariant.
That seems kind of silly... and I tripped over it while writing some
other code.  This patch makes the constructor do the right thing, and it
introduces some tests to verify that behavior.

v2: Add general-ir-test to .gitignore.  Update the description of the
ir_variable invariant for arrays in the commit message.  Both suggested
by Paul.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>

2 files changed, 90 insertions, 0 deletions

diff --git a/src/glsl/tests/.gitignore b/src/glsl/tests/.gitignore
index de81adf..15ce248 100644
--- a/src/glsl/tests/.gitignore
+++ b/src/glsl/tests/.gitignore
@@ -1,3 +1,4 @@
 ralloc-test
 uniform-initializer-test
 sampler-types-test
+general-ir-test
diff --git a/src/glsl/tests/general_ir_test.cpp b/src/glsl/tests/general_ir_test.cpp
new file mode 100644
index 0000000..862fa19
--- /dev/null
+++ b/src/glsl/tests/general_ir_test.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright © 2013 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.
+ */
+#include <gtest/gtest.h>
+#include "main/compiler.h"
+#include "main/mtypes.h"
+#include "main/macros.h"
+#include "ralloc.h"
+#include "ir.h"
+
+TEST(ir_variable_constructor, interface)
+{
+   void *mem_ctx = ralloc_context(NULL);
+
+   static const glsl_struct_field f[] = {
+      {
+         glsl_type::vec(4),
+         "v",
+         false
+      }
+   };
+
+   const glsl_type *const interface =
+      glsl_type::get_interface_instance(f,
+                                        ARRAY_SIZE(f),
+                                        GLSL_INTERFACE_PACKING_STD140,
+                                        "simple_interface");
+
+   static const char name[] = "named_instance";
+
+   ir_variable *const v =
+      new(mem_ctx) ir_variable(interface, name, ir_var_uniform);
+
+   EXPECT_STREQ(name, v->name);
+   EXPECT_NE(name, v->name);
+   EXPECT_EQ(interface, v->type);
+   EXPECT_EQ(interface, v->get_interface_type());
+}
+
+TEST(ir_variable_constructor, interface_array)
+{
+   void *mem_ctx = ralloc_context(NULL);
+
+   static const glsl_struct_field f[] = {
+      {
+         glsl_type::vec(4),
+         "v",
+         false
+      }
+   };
+
+   const glsl_type *const interface =
+      glsl_type::get_interface_instance(f,
+                                        ARRAY_SIZE(f),
+                                        GLSL_INTERFACE_PACKING_STD140,
+                                        "simple_interface");
+
+   const glsl_type *const interface_array =
+      glsl_type::get_array_instance(interface, 2);
+
+   static const char name[] = "array_instance";
+
+   ir_variable *const v =
+      new(mem_ctx) ir_variable(interface_array, name, ir_var_uniform);
+
+   EXPECT_STREQ(name, v->name);
+   EXPECT_NE(name, v->name);
+   EXPECT_EQ(interface_array, v->type);
+   EXPECT_EQ(interface, v->get_interface_type());
+}