From 7682e7bc2eb0a7a2a839fabd7c9fa103c117b876 Mon Sep 17 00:00:00 2001
From: Neil Booth <neilb@earthling.net>
Date: Mon, 4 Dec 2000 22:05:19 +0000
Subject: tradcif.y: Move lexptr to top of file.

        * tradcif.y: Move lexptr to top of file.  Add rule to handle
        assertions in conditional expressions.
        * tradcpp.c (parse_answer): Assertions do not need to go to
        end of line in conditional directives.
        (parse_assertion): Get first character of identifiers correct.
        (test_assertion): New function.
        * tradcpp.h (test_assertion): New prototype.

From-SVN: r38011
---
 gcc/tradcpp.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 46 insertions(+), 3 deletions(-)

(limited to 'gcc/tradcpp.c')

diff --git a/gcc/tradcpp.c b/gcc/tradcpp.c
index 51c8aff..5db2a84 100644
--- a/gcc/tradcpp.c
+++ b/gcc/tradcpp.c
@@ -3057,11 +3057,14 @@ parse_answer (buf, limit, answerp, type)
     buf++;
 
   /* Parentheses are optional here.  */
-  if (buf == limit && (type == T_IF || type == T_UNASSERT))
+  if (buf == limit && type == T_UNASSERT)
     return 0;
 
   if (buf == limit || *buf++ != '(')
     {
+      if (type == T_IF)
+	return 0;
+
       error ("missing '(' after predicate");
       return 1;
     }
@@ -3118,8 +3121,12 @@ parse_assertion (buf, limit, answerp, type)
   unsigned int len;
 
   bp = symname;
-  while (bp < climit && is_idchar[*bp])
-    bp++;
+  if (bp < climit && is_idstart[*bp])
+    {
+      do
+	bp++;
+      while (bp < climit && is_idchar[*bp]);
+    }
   len = bp - symname;
 
   *answerp = 0;
@@ -3130,6 +3137,8 @@ parse_assertion (buf, limit, answerp, type)
       else
 	error ("predicate must be an identifier");
     }
+  /* Unfortunately, because of the way we handle #if, we don't avoid
+     macro expansion in answers.  This is not easy to fix.  */
   else if (parse_answer (bp, climit, answerp, type) == 0)
     {
       unsigned char *sym = alloca (len + 1);
@@ -3148,6 +3157,40 @@ parse_assertion (buf, limit, answerp, type)
   return result;
 }
 
+/* Test an assertion within a preprocessor conditional.  Returns zero
+   on error or failure, one on success.  */
+int
+test_assertion (pbuf)
+     unsigned char **pbuf;	/* NUL-terminated.  */
+{
+  unsigned char *buf = *pbuf;
+  unsigned char *limit = buf + strlen ((char *) buf);
+  struct answer *answer;
+  HASHNODE *node;
+  int result = 0;
+
+  node = parse_assertion (buf, limit, &answer, T_IF);
+  if (node)
+    {
+      result = (node->type == T_ASSERT &&
+		(answer == 0 || *find_answer (node, answer) != 0));
+
+      /* Yuk.  We update pbuf to point after the assertion test.
+	 First, move past the identifier.  */
+      if (is_space[*buf])
+	buf++;
+      while (is_idchar[*buf])
+	buf++;
+      /* If we have an answer, we need to move past the parentheses.  */
+      if (answer)
+	while (*buf++ != ')')
+	  ;
+      *pbuf = buf;
+    }
+
+  return result;
+}
+
 /* Handle a #assert directive.  */
 static void
 do_assert (buf, limit, op)
-- 
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