Mesa (master): glsl/glcpp: Do not allow undefining the built-in macros

[Carl Worth]

Module: Mesa
Branch: master
Commit: 64b7fc2dd16cd4a4966a4ed8e9f239c53715f1d5
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=64b7fc2dd16cd4a4966a4ed8e9f239c53715f1d5

Author: Anuj Phogat <anuj.phogat at gmail.com>
Date:   Fri Jun  6 16:56:58 2014 -0700

glsl/glcpp: Do not allow undefining the built-in macros

Fixes piglit tests in spec/glsl-es-3.00/compile:
undef-__FILE__.vert
undef-GL_ES.vert
undef-__LINE__.vert
undef-__VERSION__.vert

Also, fixes Khronos GLES3 CTS tests:
undefine_invalid_object_1_vertex
undefine_invalid_object_1_fragment
undefine_invalid_object_2_vertex
undefine_invalid_object_2_fragment

Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
Reviewed-by: Carl Worth <cworth at cworth.org>

---

 src/glsl/glcpp/glcpp-parse.y |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/glsl/glcpp/glcpp-parse.y b/src/glsl/glcpp/glcpp-parse.y
index ccf8105..9d8b5bb 100644
--- a/src/glsl/glcpp/glcpp-parse.y
+++ b/src/glsl/glcpp/glcpp-parse.y
@@ -260,6 +260,12 @@ control_line:
 |	HASH_UNDEF {
 		glcpp_parser_resolve_implicit_version(parser);
 	} IDENTIFIER NEWLINE {
+		if (strcmp("__LINE__", $3) == 0
+		    || strcmp("__FILE__", $3) == 0
+		    || strcmp("__VERSION__", $3) == 0)
+			glcpp_error(& @1, parser, "Built-in (pre-defined)"
+				    " macro names can not be undefined.");
+
 		macro_t *macro = hash_table_find (parser->defines, $3);
 		if (macro) {
 			hash_table_remove (parser->defines, $3);