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>

6 files changed, 115 insertions, 4 deletions

diff --git a/src/glsl/Makefile.am b/src/glsl/Makefile.am
index cbf253c..f43f49d 100644
--- a/src/glsl/Makefile.am
+++ b/src/glsl/Makefile.am
@@ -32,6 +32,7 @@ AM_CXXFLAGS = $(VISIBILITY_CXXFLAGS)
 include Makefile.sources
 
 TESTS = glcpp/tests/glcpp-test				\
+	tests/general-ir-test				\
 	tests/optimization-test				\
 	tests/ralloc-test				\
 	tests/sampler-types-test                        \
@@ -45,12 +46,27 @@ noinst_LTLIBRARIES = libglsl.la libglcpp.la
 check_PROGRAMS =					\
 	glcpp/glcpp					\
 	glsl_test					\
+	tests/general-ir-test				\
 	tests/ralloc-test				\
 	tests/sampler-types-test			\
 	tests/uniform-initializer-test
 
 noinst_PROGRAMS = glsl_compiler
 
+tests_general_ir_test_SOURCES =		\
+	$(top_srcdir)/src/mesa/main/hash_table.c	\
+	$(top_srcdir)/src/mesa/main/imports.c		\
+	$(top_srcdir)/src/mesa/program/prog_hash_table.c\
+	$(top_srcdir)/src/mesa/program/symbol_table.c	\
+	$(GLSL_SRCDIR)/standalone_scaffolding.cpp \
+	tests/general_ir_test.cpp
+tests_general_ir_test_CFLAGS =				\
+	$(PTHREAD_CFLAGS)
+tests_general_ir_test_LDADD =				\
+	$(top_builddir)/src/gtest/libgtest.la		\
+	$(top_builddir)/src/glsl/libglsl.la		\
+	$(PTHREAD_LIBS)
+
 tests_uniform_initializer_test_SOURCES =		\
 	$(top_srcdir)/src/mesa/main/hash_table.c	\
 	$(top_srcdir)/src/mesa/main/imports.c		\
diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index dfa32d9..b644b22 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -4876,7 +4876,6 @@ ast_interface_block::hir(exec_list *instructions,
                                       var_mode);
       }
 
-      var->init_interface_type(block_type);
       if (state->target == geometry_shader && var_mode == ir_var_shader_in)
          handle_geometry_shader_input_decl(state, loc, var);
 
diff --git a/src/glsl/builtin_variables.cpp b/src/glsl/builtin_variables.cpp
index 64f3406..fc1115b 100644
--- a/src/glsl/builtin_variables.cpp
+++ b/src/glsl/builtin_variables.cpp
@@ -890,7 +890,6 @@ builtin_variable_generator::generate_varyings()
          this->per_vertex_in.construct_interface_instance();
       ir_variable *var = add_variable("gl_in", array(per_vertex_in_type, 0),
                                       ir_var_shader_in, -1);
-      var->init_interface_type(per_vertex_in_type);
    }
    if (state->target == vertex_shader || state->target == geometry_shader) {
       const glsl_type *per_vertex_out_type =
diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index de9613e..54a8e40 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -1603,8 +1603,15 @@ ir_variable::ir_variable(const struct glsl_type *type, const char *name,
    this->depth_layout = ir_depth_layout_none;
    this->used = false;
 
-   if (type && type->base_type == GLSL_TYPE_SAMPLER)
-      this->read_only = true;
+   if (type != NULL) {
+      if (type->base_type == GLSL_TYPE_SAMPLER)
+         this->read_only = true;
+
+      if (type->is_interface())
+         this->init_interface_type(type);
+      else if (type->is_array() && type->fields.array->is_interface())
+         this->init_interface_type(type->fields.array);
+   }
 }
 
 
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());
+}