ir_reader: Refactor reading of dereferences for later reuse.

diff --git a/ir_reader.cpp b/ir_reader.cpp
index f4b9967d449ef8462aa9333d1d9dbaf058848bea..019631f808024fc8d3803d5803e385c9f66b7cf9 100644 (file)
--- a/ir_reader.cpp
+++ b/ir_reader.cpp
@@ -53,6 +53,9 @@ static ir_expression *read_expression(_mesa_glsl_parse_state *, s_list *);
 static ir_call *read_call(_mesa_glsl_parse_state *, s_list *);
 static ir_swizzle *read_swizzle(_mesa_glsl_parse_state *, s_list *);
 static ir_constant *read_constant(_mesa_glsl_parse_state *, s_list *);
+
+static ir_dereference *read_dereference(_mesa_glsl_parse_state *,
+                                       s_expression *);
 static ir_dereference *read_var_ref(_mesa_glsl_parse_state *, s_list *);
 static ir_dereference *read_array_ref(_mesa_glsl_parse_state *, s_list *);
 static ir_dereference *read_record_ref(_mesa_glsl_parse_state *, s_list *);
@@ -528,8 +531,10 @@ read_rvalue(_mesa_glsl_parse_state *st, s_expression *expr)
       return NULL;
    }
 
-   ir_rvalue *rvalue = NULL;
-   if (strcmp(tag->value(), "swiz") == 0) {
+   ir_rvalue *rvalue = read_dereference(st, list);
+   if (rvalue != NULL || st->error)
+      return rvalue;
+   else if (strcmp(tag->value(), "swiz") == 0) {
       rvalue = read_swizzle(st, list);
    } else if (strcmp(tag->value(), "assign") == 0) {
       rvalue = read_assignment(st, list);
@@ -539,12 +544,6 @@ read_rvalue(_mesa_glsl_parse_state *st, s_expression *expr)
       rvalue = read_call(st, list);
    } else if (strcmp(tag->value(), "constant") == 0) {
       rvalue = read_constant(st, list);
-   } else if (strcmp(tag->value(), "var_ref") == 0) {
-      rvalue = read_var_ref(st, list);
-   } else if (strcmp(tag->value(), "array_ref") == 0) {
-      rvalue = read_array_ref(st, list);
-   } else if (strcmp(tag->value(), "record_ref") == 0) {
-      rvalue = read_record_ref(st, list);
    } else {
       ir_read_error(st, expr, "unrecognized rvalue tag: %s", tag->value());
    }
@@ -817,6 +816,25 @@ read_constant(_mesa_glsl_parse_state *st, s_list *list)
    return NULL; // should not be reached
 }
 
+static ir_dereference *
+read_dereference(_mesa_glsl_parse_state *st, s_expression *expr)
+{
+   s_list *list = SX_AS_LIST(expr);
+   if (list == NULL || list->subexpressions.is_empty())
+      return NULL;
+
+   s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.head);
+   assert(tag != NULL);
+
+   if (strcmp(tag->value(), "var_ref") == 0)
+      return read_var_ref(st, list);
+   if (strcmp(tag->value(), "array_ref") == 0)
+      return read_array_ref(st, list);
+   if (strcmp(tag->value(), "record_ref") == 0)
+      return read_record_ref(st, list);
+   return NULL;
+}
+
 static ir_dereference *
 read_var_ref(_mesa_glsl_parse_state *st, s_list *list)
 {