glsl: introduce data section to ir_variable

Data section helps serialization and cloning of a ir_variable. This
patch includes the helper bits used for read only ir_variables.

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>

17 files changed, 81 insertions, 73 deletions

diff --git a/src/glsl/ast_function.cpp b/src/glsl/ast_function.cpp
index 6423759..8202116 100644
--- a/src/glsl/ast_function.cpp
+++ b/src/glsl/ast_function.cpp
@@ -157,7 +157,7 @@ verify_parameter_modes(_mesa_glsl_parse_state *state,
 	 if (var)
 	    var->assigned = true;
 
-	 if (var && var->read_only) {
+	 if (var && var->data.read_only) {
 	    _mesa_glsl_error(&loc, state,
 			     "function parameter '%s %s' references the "
 			     "read-only variable '%s'",
diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index f35d867..0278f97 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -776,7 +776,7 @@ do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
 			  non_lvalue_description);
 	 error_emitted = true;
       } else if (lhs->variable_referenced() != NULL
-		 && lhs->variable_referenced()->read_only) {
+		 && lhs->variable_referenced()->data.read_only) {
          _mesa_glsl_error(&lhs_loc, state,
                           "assignment to read-only variable '%s'",
                           lhs->variable_referenced()->name);
@@ -2168,20 +2168,20 @@ apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
 			  "`invariant' after being used",
 			  var->name);
       } else {
-	 var->invariant = 1;
+	 var->data.invariant = 1;
       }
    }
 
    if (qual->flags.q.constant || qual->flags.q.attribute
        || qual->flags.q.uniform
        || (qual->flags.q.varying && (state->target == fragment_shader)))
-      var->read_only = 1;
+      var->data.read_only = 1;
 
    if (qual->flags.q.centroid)
-      var->centroid = 1;
+      var->data.centroid = 1;
 
    if (qual->flags.q.sample)
-      var->sample = 1;
+      var->data.sample = 1;
 
    if (qual->flags.q.attribute && state->target != vertex_shader) {
       var->type = glsl_type::error_type;
@@ -2275,16 +2275,16 @@ apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
       switch (state->target) {
       case vertex_shader:
 	 if (var->mode == ir_var_shader_out)
-	    var->invariant = true;
+	    var->data.invariant = true;
 	 break;
       case geometry_shader:
 	 if ((var->mode == ir_var_shader_in)
              || (var->mode == ir_var_shader_out))
-	    var->invariant = true;
+	    var->data.invariant = true;
 	 break;
       case fragment_shader:
 	 if (var->mode == ir_var_shader_in)
-	    var->invariant = true;
+	    var->data.invariant = true;
 	 break;
       }
    }
@@ -2650,9 +2650,9 @@ process_initializer(ir_variable *var, ast_declaration *decl,
    }
 
    if (rhs && !rhs->type->is_error()) {
-      bool temp = var->read_only;
+      bool temp = var->data.read_only;
       if (type->qualifier.flags.q.constant)
-	 var->read_only = false;
+	 var->data.read_only = false;
 
       /* Never emit code to initialize a uniform.
        */
@@ -2691,7 +2691,7 @@ process_initializer(ir_variable *var, ast_declaration *decl,
        */
       var->type = initializer_type;
 
-      var->read_only = temp;
+      var->data.read_only = temp;
    }
 
    return result;
@@ -2859,7 +2859,7 @@ ast_declarator_list::hir(exec_list *instructions,
 			     "`invariant' after being used",
 			     earlier->name);
 	 } else {
-	    earlier->invariant = true;
+	    earlier->data.invariant = true;
 	 }
       }
 
@@ -3077,7 +3077,7 @@ ast_declarator_list::hir(exec_list *instructions,
 			     mode, var->name, extra);
 	 }
       } else if (var->mode == ir_var_shader_in) {
-         var->read_only = true;
+         var->data.read_only = true;
 
 	 if (state->target == vertex_shader) {
 	    bool error_emitted = false;
@@ -5097,8 +5097,8 @@ ast_interface_block::hir(exec_list *instructions,
                                    ralloc_strdup(state, fields[i].name),
                                    var_mode);
          var->interpolation = fields[i].interpolation;
-         var->centroid = fields[i].centroid;
-         var->sample = fields[i].sample;
+         var->data.centroid = fields[i].centroid;
+         var->data.sample = fields[i].sample;
          var->init_interface_type(block_type);
 
          if (redeclaring_per_vertex) {
diff --git a/src/glsl/builtin_variables.cpp b/src/glsl/builtin_variables.cpp
index d0e76e3..9cc11b7 100644
--- a/src/glsl/builtin_variables.cpp
+++ b/src/glsl/builtin_variables.cpp
@@ -442,7 +442,7 @@ builtin_variable_generator::add_variable(const char *name,
    case ir_var_shader_in:
    case ir_var_uniform:
    case ir_var_system_value:
-      var->read_only = true;
+      var->data.read_only = true;
       break;
    case ir_var_shader_out:
       break;
@@ -937,8 +937,8 @@ builtin_variable_generator::generate_varyings()
             add_variable(fields[i].name, fields[i].type, ir_var_shader_out,
                          fields[i].location);
          var->interpolation = fields[i].interpolation;
-         var->centroid = fields[i].centroid;
-         var->sample = fields[i].sample;
+         var->data.centroid = fields[i].centroid;
+         var->data.sample = fields[i].sample;
          var->init_interface_type(per_vertex_out_type);
       }
    }
diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index 623bc1b..a3ca4ef 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -1359,7 +1359,7 @@ ir_dereference::is_lvalue() const
 
    /* Every l-value derference chain eventually ends in a variable.
     */
-   if ((var == NULL) || var->read_only)
+   if ((var == NULL) || var->data.read_only)
       return false;
 
    /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
@@ -1580,7 +1580,6 @@ ir_swizzle::variable_referenced() const
 ir_variable::ir_variable(const struct glsl_type *type, const char *name,
 			 ir_variable_mode mode)
    : max_array_access(0), max_ifc_array_access(NULL),
-     read_only(false), centroid(false), sample(false), invariant(false),
      how_declared(ir_var_declared_normally), mode(mode),
      interpolation(INTERP_QUALIFIER_NONE), atomic()
 {
@@ -1598,10 +1597,14 @@ ir_variable::ir_variable(const struct glsl_type *type, const char *name,
    this->pixel_center_integer = false;
    this->depth_layout = ir_depth_layout_none;
    this->used = false;
+   this->data.read_only = false;
+   this->data.centroid = false;
+   this->data.sample = false;
+   this->data.invariant = false;
 
    if (type != NULL) {
       if (type->base_type == GLSL_TYPE_SAMPLER)
-         this->read_only = true;
+         this->data.read_only = true;
 
       if (type->is_interface())
          this->init_interface_type(type);
@@ -1701,11 +1704,11 @@ ir_function_signature::qualifiers_match(exec_list *params)
       ir_variable *a = (ir_variable *)iter_a.get();
       ir_variable *b = (ir_variable *)iter_b.get();
 
-      if (a->read_only != b->read_only ||
+      if (a->data.read_only != b->data.read_only ||
 	  !modes_match(a->mode, b->mode) ||
 	  a->interpolation != b->interpolation ||
-	  a->centroid != b->centroid ||
-         a->sample != b->sample) {
+	  a->data.centroid != b->data.centroid ||
+         a->data.sample != b->data.sample) {
 
 	 /* parameter a's qualifiers don't match */
 	 return a->name;
@@ -1891,7 +1894,7 @@ mode_string(const ir_variable *var)
 {
    switch (var->mode) {
    case ir_var_auto:
-      return (var->read_only) ? "global constant" : "global variable";
+      return (var->data.read_only) ? "global constant" : "global variable";
 
    case ir_var_uniform:
       return "uniform";
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index 7a939a2..cdede59 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -522,16 +522,20 @@ public:
     */
    unsigned *max_ifc_array_access;
 
-   /**
-    * Is the variable read-only?
-    *
-    * This is set for variables declared as \c const, shader inputs,
-    * and uniforms.
-    */
-   unsigned read_only:1;
-   unsigned centroid:1;
-   unsigned sample:1;
-   unsigned invariant:1;
+   struct ir_variable_data {
+
+      /**
+       * Is the variable read-only?
+       *
+       * This is set for variables declared as \c const, shader inputs,
+       * and uniforms.
+       */
+      unsigned read_only:1;
+      unsigned centroid:1;
+      unsigned sample:1;
+      unsigned invariant:1;
+
+   } data;
 
    /**
     * Has this variable been used for reading or writing?
diff --git a/src/glsl/ir_clone.cpp b/src/glsl/ir_clone.cpp
index df6e971..a781cf0 100644
--- a/src/glsl/ir_clone.cpp
+++ b/src/glsl/ir_clone.cpp
@@ -50,10 +50,10 @@ ir_variable::clone(void *mem_ctx, struct hash_table *ht) const
       memcpy(var->max_ifc_array_access, this->max_ifc_array_access,
              this->interface_type->length * sizeof(unsigned));
    }
-   var->read_only = this->read_only;
-   var->centroid = this->centroid;
-   var->sample = this->sample;
-   var->invariant = this->invariant;
+   var->data.read_only = this->data.read_only;
+   var->data.centroid = this->data.centroid;
+   var->data.sample = this->data.sample;
+   var->data.invariant = this->data.invariant;
    var->interpolation = this->interpolation;
    var->location = this->location;
    var->index = this->index;
diff --git a/src/glsl/ir_print_visitor.cpp b/src/glsl/ir_print_visitor.cpp
index 2beefed..ae5074b 100644
--- a/src/glsl/ir_print_visitor.cpp
+++ b/src/glsl/ir_print_visitor.cpp
@@ -148,9 +148,9 @@ void ir_print_visitor::visit(ir_variable *ir)
 {
    printf("(declare ");
 
-   const char *const cent = (ir->centroid) ? "centroid " : "";
-   const char *const samp = (ir->sample) ? "sample " : "";
-   const char *const inv = (ir->invariant) ? "invariant " : "";
+   const char *const cent = (ir->data.centroid) ? "centroid " : "";
+   const char *const samp = (ir->data.sample) ? "sample " : "";
+   const char *const inv = (ir->data.invariant) ? "invariant " : "";
    const char *const mode[] = { "", "uniform ", "shader_in ", "shader_out ",
                                 "in ", "out ", "inout ",
 			        "const_in ", "sys ", "temporary " };
diff --git a/src/glsl/ir_reader.cpp b/src/glsl/ir_reader.cpp
index 4afe281..127358c 100644
--- a/src/glsl/ir_reader.cpp
+++ b/src/glsl/ir_reader.cpp
@@ -412,11 +412,11 @@ ir_reader::read_declaration(s_expression *expr)
 
       // FINISHME: Check for duplicate/conflicting qualifiers.
       if (strcmp(qualifier->value(), "centroid") == 0) {
-	 var->centroid = 1;
+	 var->data.centroid = 1;
       } else if (strcmp(qualifier->value(), "sample") == 0) {
-         var->sample = 1;
+         var->data.sample = 1;
       } else if (strcmp(qualifier->value(), "invariant") == 0) {
-	 var->invariant = 1;
+	 var->data.invariant = 1;
       } else if (strcmp(qualifier->value(), "uniform") == 0) {
 	 var->mode = ir_var_uniform;
       } else if (strcmp(qualifier->value(), "auto") == 0) {
diff --git a/src/glsl/ir_set_program_inouts.cpp b/src/glsl/ir_set_program_inouts.cpp
index 1a36527..2d82439 100644
--- a/src/glsl/ir_set_program_inouts.cpp
+++ b/src/glsl/ir_set_program_inouts.cpp
@@ -100,9 +100,9 @@ mark(struct gl_program *prog, ir_variable *var, int offset, int len,
             gl_fragment_program *fprog = (gl_fragment_program *) prog;
             fprog->InterpQualifier[var->location + var->index + offset + i] =
                (glsl_interp_qualifier) var->interpolation;
-            if (var->centroid)
+            if (var->data.centroid)
                fprog->IsCentroid |= bitfield;
-            if (var->sample)
+            if (var->data.sample)
                fprog->IsSample |= bitfield;
          }
       } else if (var->mode == ir_var_system_value) {
diff --git a/src/glsl/link_varyings.cpp b/src/glsl/link_varyings.cpp
index 097cee5..53a9d75 100644
--- a/src/glsl/link_varyings.cpp
+++ b/src/glsl/link_varyings.cpp
@@ -93,39 +93,39 @@ cross_validate_types_and_qualifiers(struct gl_shader_program *prog,
 
    /* Check that all of the qualifiers match between stages.
     */
-   if (input->centroid != output->centroid) {
+   if (input->data.centroid != output->data.centroid) {
       linker_error(prog,
                    "%s shader output `%s' %s centroid qualifier, "
                    "but %s shader input %s centroid qualifier\n",
                    _mesa_glsl_shader_target_name(producer_type),
                    output->name,
-                   (output->centroid) ? "has" : "lacks",
+                   (output->data.centroid) ? "has" : "lacks",
                    _mesa_glsl_shader_target_name(consumer_type),
-                   (input->centroid) ? "has" : "lacks");
+                   (input->data.centroid) ? "has" : "lacks");
       return;
    }
 
-   if (input->sample != output->sample) {
+   if (input->data.sample != output->data.sample) {
       linker_error(prog,
                    "%s shader output `%s' %s sample qualifier, "
                    "but %s shader input %s sample qualifier\n",
                    _mesa_glsl_shader_target_name(producer_type),
                    output->name,
-                   (output->sample) ? "has" : "lacks",
+                   (output->data.sample) ? "has" : "lacks",
                    _mesa_glsl_shader_target_name(consumer_type),
-                   (input->sample) ? "has" : "lacks");
+                   (input->data.sample) ? "has" : "lacks");
       return;
    }
 
-   if (input->invariant != output->invariant) {
+   if (input->data.invariant != output->data.invariant) {
       linker_error(prog,
                    "%s shader output `%s' %s invariant qualifier, "
                    "but %s shader input %s invariant qualifier\n",
                    _mesa_glsl_shader_target_name(producer_type),
                    output->name,
-                   (output->invariant) ? "has" : "lacks",
+                   (output->data.invariant) ? "has" : "lacks",
                    _mesa_glsl_shader_target_name(consumer_type),
-                   (input->invariant) ? "has" : "lacks");
+                   (input->data.invariant) ? "has" : "lacks");
       return;
    }
 
@@ -764,13 +764,13 @@ varying_matches::record(ir_variable *producer_var, ir_variable *consumer_var)
        * regardless of where they appear.  We can trivially satisfy that
        * requirement by changing the interpolation type to flat here.
        */
-      producer_var->centroid = false;
-      producer_var->sample = false;
+      producer_var->data.centroid = false;
+      producer_var->data.sample = false;
       producer_var->interpolation = INTERP_QUALIFIER_FLAT;
 
       if (consumer_var) {
-         consumer_var->centroid = false;
-         consumer_var->sample = false;
+         consumer_var->data.centroid = false;
+         consumer_var->data.sample = false;
          consumer_var->interpolation = INTERP_QUALIFIER_FLAT;
       }
    }
@@ -887,7 +887,7 @@ varying_matches::compute_packing_class(ir_variable *var)
     *
     * Therefore, the packing class depends only on the interpolation type.
     */
-   unsigned packing_class = var->centroid | (var->sample << 1);
+   unsigned packing_class = var->data.centroid | (var->data.sample << 1);
    packing_class *= 4;
    packing_class += var->interpolation;
    return packing_class;
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 9e8eca5..38bf579 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -753,19 +753,19 @@ cross_validate_globals(struct gl_shader_program *prog,
 	       existing->has_initializer = true;
 	    }
 
-	    if (existing->invariant != var->invariant) {
+	    if (existing->data.invariant != var->data.invariant) {
 	       linker_error(prog, "declarations for %s `%s' have "
 			    "mismatching invariant qualifiers\n",
 			    mode_string(var), var->name);
 	       return;
 	    }
-            if (existing->centroid != var->centroid) {
+            if (existing->data.centroid != var->data.centroid) {
                linker_error(prog, "declarations for %s `%s' have "
 			    "mismatching centroid qualifiers\n",
 			    mode_string(var), var->name);
                return;
             }
-            if (existing->sample != var->sample) {
+            if (existing->data.sample != var->data.sample) {
                linker_error(prog, "declarations for %s `%s` have "
                             "mismatching sample qualifiers\n",
                             mode_string(var), var->name);
diff --git a/src/glsl/loop_analysis.h b/src/glsl/loop_analysis.h
index 6799f87..f841042 100644
--- a/src/glsl/loop_analysis.h
+++ b/src/glsl/loop_analysis.h
@@ -217,7 +217,8 @@ public:
 
       /* Variables that are marked read-only *MUST* be loop constant.
        */
-      assert(!this->var->read_only || (this->var->read_only && is_const));
+      assert(!this->var->data.read_only
+            || (this->var->data.read_only && is_const));
 
       return is_const;
    }
diff --git a/src/glsl/lower_named_interface_blocks.cpp b/src/glsl/lower_named_interface_blocks.cpp
index aa4c110..0775375 100644
--- a/src/glsl/lower_named_interface_blocks.cpp
+++ b/src/glsl/lower_named_interface_blocks.cpp
@@ -156,8 +156,8 @@ flatten_named_interface_blocks_declarations::run(exec_list *instructions)
             new_var->explicit_location = (new_var->location >= 0);
             new_var->interpolation =
                iface_t->fields.structure[i].interpolation;
-            new_var->centroid = iface_t->fields.structure[i].centroid;
-            new_var->sample = iface_t->fields.structure[i].sample;
+            new_var->data.centroid = iface_t->fields.structure[i].centroid;
+            new_var->data.sample = iface_t->fields.structure[i].sample;
 
             new_var->init_interface_type(iface_t);
             hash_table_insert(interface_namespace, new_var,
diff --git a/src/glsl/lower_packed_varyings.cpp b/src/glsl/lower_packed_varyings.cpp
index e097e81..498914e 100644
--- a/src/glsl/lower_packed_varyings.cpp
+++ b/src/glsl/lower_packed_varyings.cpp
@@ -564,8 +564,8 @@ lower_packed_varyings_visitor::get_packed_varying_deref(
           */
          packed_var->max_array_access = this->gs_input_vertices - 1;
       }
-      packed_var->centroid = unpacked_var->centroid;
-      packed_var->sample = unpacked_var->sample;
+      packed_var->data.centroid = unpacked_var->data.centroid;
+      packed_var->data.sample = unpacked_var->data.sample;
       packed_var->interpolation = unpacked_var->interpolation;
       packed_var->location = location;
       unpacked_var->insert_before(packed_var);
diff --git a/src/glsl/opt_cse.cpp b/src/glsl/opt_cse.cpp
index 8f73940..a2b63ee 100644
--- a/src/glsl/opt_cse.cpp
+++ b/src/glsl/opt_cse.cpp
@@ -193,7 +193,7 @@ is_cse_candidate_visitor::visit(ir_dereference_variable *ir)
    /* Currently, since we don't handle kills of the ae based on variables
     * getting assigned, we can only handle constant variables.
     */
-   if (ir->var->read_only) {
+   if (ir->var->data.read_only) {
       return visit_continue;
    } else {
       ok = false;
diff --git a/src/glsl/opt_function_inlining.cpp b/src/glsl/opt_function_inlining.cpp
index f8033a0..86d0fa3 100644
--- a/src/glsl/opt_function_inlining.cpp
+++ b/src/glsl/opt_function_inlining.cpp
@@ -139,7 +139,7 @@ ir_call::generate_inline(ir_instruction *next_ir)
 	  * read-only and the inlined function is inside a loop, the loop
 	  * analysis code will get confused.
 	  */
-	 parameters[i]->read_only = false;
+	 parameters[i]->data.read_only = false;
 	 next_ir->insert_before(parameters[i]);
       }
 
diff --git a/src/glsl/tests/builtin_variable_test.cpp b/src/glsl/tests/builtin_variable_test.cpp
index 366fbce..accdd91 100644
--- a/src/glsl/tests/builtin_variable_test.cpp
+++ b/src/glsl/tests/builtin_variable_test.cpp
@@ -129,7 +129,7 @@ common_builtin::constants_are_constant()
 
       EXPECT_FALSE(var->explicit_location);
       EXPECT_EQ(-1, var->location);
-      EXPECT_TRUE(var->read_only);
+      EXPECT_TRUE(var->data.read_only);
    }
 }