glsl: Parse define directive in preprocessor.

1 files changed, 156 insertions, 0 deletions

diff --git a/src/glsl/pp/sl_pp_define.c b/src/glsl/pp/sl_pp_define.c
new file mode 100644
index 0000000000..5ce0f0551b
--- /dev/null
+++ b/src/glsl/pp/sl_pp_define.c
@@ -0,0 +1,156 @@
+/**************************************************************************
+ * 
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+#include <stdlib.h>
+#include "sl_pp_process.h"
+
+
+static void
+skip_whitespace(const struct sl_pp_token_info *input,
+                unsigned int *first,
+                unsigned int last)
+{
+   while (*first < last && input[*first].token == SL_PP_WHITESPACE) {
+      (*first)++;
+   }
+}
+
+
+static int
+_parse_formal_args(const struct sl_pp_token_info *input,
+                   unsigned int *first,
+                   unsigned int last,
+                   struct sl_pp_macro *macro)
+{
+   struct sl_pp_macro_formal_arg **arg;
+
+   skip_whitespace(input, first, last);
+   if (*first < last) {
+      if (input[*first].token == SL_PP_RPAREN) {
+         (*first)++;
+         return 0;
+      }
+   } else {
+      /* Expected either an identifier or `)'. */
+      return -1;
+   }
+
+   arg = &macro->arg;
+
+   for (;;) {
+      if (*first < last && input[*first].token != SL_PP_IDENTIFIER) {
+         /* Expected an identifier. */
+         return -1;
+      }
+
+      *arg = malloc(sizeof(struct sl_pp_macro_formal_arg));
+      if (!*arg) {
+         return -1;
+      }
+
+      (**arg).name = input[*first].data.identifier;
+      (*first)++;
+
+      (**arg).next = NULL;
+      arg = &(**arg).next;
+
+      skip_whitespace(input, first, last);
+      if (*first < last) {
+         if (input[*first].token == SL_PP_COMMA) {
+            (*first)++;
+         } else if (input[*first].token == SL_PP_RPAREN) {
+            (*first)++;
+            return 0;
+         } else {
+            /* Expected either `,' or `)'. */
+            return -1;
+         }
+      } else {
+         /* Expected either `,' or `)'. */
+         return -1;
+      }
+   }
+}
+
+
+int
+sl_pp_process_define(struct sl_pp_context *context,
+                     const struct sl_pp_token_info *input,
+                     unsigned int first,
+                     unsigned int last,
+                     struct sl_pp_macro *macro)
+{
+   macro->name = -1;
+   macro->arg = NULL;
+   macro->body = NULL;
+   macro->next = NULL;
+
+   if (first < last && input[first].token == SL_PP_IDENTIFIER) {
+      macro->name = input[first].data.identifier;
+      first++;
+   }
+
+   if (macro->name == -1) {
+      return -1;
+   }
+
+   /*
+    * If there is no whitespace between macro name and left paren, a macro
+    * formal argument list follows. This is the only place where the presence
+    * of a whitespace matters and it's the only reason why we are dealing
+    * with whitespace at this level.
+    */
+   if (first < last && input[first].token == SL_PP_LPAREN) {
+      first++;
+      if (_parse_formal_args(input, &first, last, macro)) {
+         return -1;
+      }
+   }
+
+   /* Trim whitespace from the left side. */
+   skip_whitespace(input, &first, last);
+
+   /* Trom whitespace from the right side. */
+   while (first < last && input[last - 1].token == SL_PP_WHITESPACE) {
+      last--;
+   }
+
+   /* All that is left between first and last is the macro definition. */
+   macro->body_len = last - first;
+   if (macro->body_len) {
+      macro->body = malloc(sizeof(struct sl_pp_token_info) * macro->body_len);
+      if (!macro->body) {
+         return -1;
+      }
+
+      memcpy(macro->body,
+             &input[first],
+             sizeof(struct sl_pp_token_info) * macro->body_len);
+   }
+
+   return 0;
+}