glsl: Set operators '%' and '%=' to be reserved when GLSL < 1.30

From section 5.9 of the GLSL 1.20 spec:
   The operator modulus (%) is reserved for future use.

From section 5.8 of the GLSL 1.20 spec:
   The assignments modulus into (%=), left shift by (<<=), right shift by
   (>>=), inclusive or into ( |=), and exclusive or into ( ^=). These
   operators are reserved for future use.

The GLSL ES 1.00 spec and GLSL 1.10 spec have similiar language.

Fixes bug:
https://bugs.freedesktop.org//show_bug.cgi?id=33916

Fixes Piglit tests:
spec/glsl-1.00/compiler/arithmetic-operators/modulus-00.frag
spec/glsl-1.00/compiler/assignment-operators/modulus-assign-00.frag
spec/glsl-1.10/compiler/arithmetic-operators/modulus-00.frag
spec/glsl-1.10/compiler/assignment-operators/modulus-assign-00.frag
spec/glsl-1.20/compiler/arithmetic-operators/modulus-00.frag
spec/glsl-1.20/compiler/assignment-operators/modulus-assign-00.frag

1 files changed, 7 insertions, 0 deletions

diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 75f28cd2c7..bef099cca3 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -435,6 +435,13 @@ modulus_result_type(const struct glsl_type *type_a,
 		    const struct glsl_type *type_b,
 		    struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
 {
+   if (state->language_version < 130) {
+      _mesa_glsl_error(loc, state,
+                       "operator '%%' is reserved in %s",
+                       state->version_string);
+      return glsl_type::error_type;
+   }
+
    /* From GLSL 1.50 spec, page 56:
     *    "The operator modulus (%) operates on signed or unsigned integers or
     *    integer vectors. The operand types must both be signed or both be