Set lower bound on size implied by whole-array assignment

When an unsized array is accessed with a constant extension index this
sets a lower bound on the allowable sizes.  When the unsized array
gets a size set due to a whole-array assignment, this size must be at
least as large as the implied lower bound.

This causes the following tests to pass:

    glslparsertest/glsl2/array-16.vert

diff --git a/ast_to_hir.cpp b/ast_to_hir.cpp
index c9f93cb..9d067be 100644 (file)
--- a/ast_to_hir.cpp
+++ b/ast_to_hir.cpp
@@ -489,6 +489,13 @@ do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
 
         assert(var != NULL);
 
+        if (var->max_array_access >= unsigned(rhs->type->array_size())) {
+           /* FINISHME: This should actually log the location of the RHS. */
+           _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
+                            "previous access",
+                            var->max_array_access);
+        }
+
         var->type = glsl_type::get_array_instance(lhs->type->element_type(),
                                                   rhs->type->array_size());
       }