glsl: add ARB_shading_language_include support to #line

From the ARB_shading_language_include spec:

   "#line must have, after macro substitution, one of the following
    forms:

       #line <line>
       #line <line> <source-string-number>
       #line <line> "<path>"

    where <line> and <source-string-number> are constant integer
    expressions and <path> is a valid string for a path supplied in the
    #include directive. After processing this directive (including its
    new-line), the implementation will behave as if it is compiling at
    line number <line> and source string number <source-string-number>
    or <path> path. Subsequent source strings will be numbered
    sequentially, until another #line directive overrides that
    numbering."

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

src/compiler/glsl/glcpp/glcpp-lex.l

@@ -202,6 +202,7 @@ DIGITS			[0-9][0-9]*
 DECIMAL_INTEGER		[1-9][0-9]*[uU]?
 OCTAL_INTEGER		0[0-7]*[uU]?
 HEXADECIMAL_INTEGER	0[xX][0-9a-fA-F]+[uU]?
+PATH			["][]^./ _A-Za-z0-9+*%[(){}|&~=!:;,?-]*["]
 
 %%
 
@@ -558,6 +559,10 @@ HEXADECIMAL_INTEGER	0[xX][0-9a-fA-F]+[uU]?
 	}
 }
 
+{PATH} {
+	RETURN_STRING_TOKEN (PATH);
+}
+
 	/* We preserve all newlines, even between #if 0..#endif, so no
 	skipping.. */
 <*>{NEWLINE} {

src/compiler/glsl/glcpp/glcpp-parse.y

@@ -174,11 +174,11 @@ add_builtin_define(glcpp_parser_t *parser, const char *name, int value);
         /* We use HASH_TOKEN, DEFINE_TOKEN and VERSION_TOKEN (as opposed to
          * HASH, DEFINE, and VERSION) to avoid conflicts with other symbols,
          * (such as the <HASH> and <DEFINE> start conditions in the lexer). */
-%token DEFINED ELIF_EXPANDED HASH_TOKEN DEFINE_TOKEN FUNC_IDENTIFIER OBJ_IDENTIFIER ELIF ELSE ENDIF ERROR_TOKEN IF IFDEF IFNDEF LINE PRAGMA UNDEF VERSION_TOKEN GARBAGE IDENTIFIER IF_EXPANDED INTEGER INTEGER_STRING LINE_EXPANDED NEWLINE OTHER PLACEHOLDER SPACE PLUS_PLUS MINUS_MINUS
+%token DEFINED ELIF_EXPANDED HASH_TOKEN DEFINE_TOKEN FUNC_IDENTIFIER OBJ_IDENTIFIER ELIF ELSE ENDIF ERROR_TOKEN IF IFDEF IFNDEF LINE PRAGMA UNDEF VERSION_TOKEN GARBAGE IDENTIFIER IF_EXPANDED INTEGER INTEGER_STRING LINE_EXPANDED NEWLINE OTHER PLACEHOLDER SPACE PLUS_PLUS MINUS_MINUS PATH
 %token PASTE
 %type <ival> INTEGER operator SPACE integer_constant version_constant
 %type <expression_value> expression
-%type <str> IDENTIFIER FUNC_IDENTIFIER OBJ_IDENTIFIER INTEGER_STRING OTHER ERROR_TOKEN PRAGMA
+%type <str> IDENTIFIER FUNC_IDENTIFIER OBJ_IDENTIFIER INTEGER_STRING OTHER ERROR_TOKEN PRAGMA PATH
 %type <string_list> identifier_list
 %type <token> preprocessing_token
 %type <token_list> pp_tokens replacement_list text_line
@@ -238,6 +238,13 @@ expanded_line:
 					   "#line %" PRIiMAX " %" PRIiMAX "\n",
 					    $2, $3);
 	}
+|	LINE_EXPANDED integer_constant PATH NEWLINE {
+		parser->has_new_line_number = 1;
+		parser->new_line_number = $2;
+		_mesa_string_buffer_printf(parser->output,
+					   "#line %" PRIiMAX " %s\n",
+					    $2, $3);
+	}
 ;
 
 define:
@@ -706,6 +713,10 @@ preprocessing_token:
 		$$ = _token_create_str (parser, INTEGER_STRING, $1);
 		$$->location = yylloc;
 	}
+|	PATH {
+		$$ = _token_create_str (parser, PATH, $1);
+		$$->location = yylloc;
+	}
 |	operator {
 		$$ = _token_create_ival (parser, $1, $1);
 		$$->location = yylloc;