glsl: build stageref mask using IR, not symbol table

Instead of using symbol table, build mask by inspecting IR. This
change is required by further patches to move resource list creation
to happen later when symbol table does not exist anymore.

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Martin Peres <martin.peres@linux.intel.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index 74c2f2d..d9527d4 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -2624,9 +2624,17 @@ build_stageref(struct gl_shader_program *shProg, const char *name)
       struct gl_shader *sh = shProg->_LinkedShaders[i];
       if (!sh)
          continue;
-      ir_variable *var = sh->symbols->get_variable(name);
-      if (var)
-         stages |= (1 << i);
+
+      /* Shader symbol table may contain variables that have
+       * been optimized away. Search IR for the variable instead.
+       */
+      foreach_in_list(ir_instruction, node, sh->ir) {
+         ir_variable *var = node->as_variable();
+         if (var && strcmp(var->name, name) == 0) {
+            stages |= (1 << i);
+            break;
+         }
+      }
    }
    return stages;
 }