[llvm-commits] CVS: llvm/utils/TableGen/FileLexer.l

[Chris Lattner]

Changes in directory llvm/utils/TableGen:

FileLexer.l updated: 1.1 -> 1.2

---
Log message:

Directly support C style comments in tblgen, but allow them to actually nest


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Diffs of the changes:

Index: llvm/utils/TableGen/FileLexer.l
diff -u llvm/utils/TableGen/FileLexer.l:1.1 llvm/utils/TableGen/FileLexer.l:1.2
--- llvm/utils/TableGen/FileLexer.l:1.1	Sun Dec  1 19:23:04 2002
+++ llvm/utils/TableGen/FileLexer.l	Wed Jul 30 14:39:36 2003
@@ -16,6 +16,7 @@
 %option noreject
 %option noyymore
 
+%x comment
 
 %{
 #include "Record.h"
@@ -29,6 +30,8 @@
   return strtol(Str, 0, 0); 
 }
 
+static int CommentDepth = 0;
+
 %}
 
 Comment     \/\/.*
@@ -63,4 +66,14 @@
 
 [ \t\n]+       { /* Ignore whitespace */ }
 .              { return Filetext[0]; }
+
+
+"/*"                    { BEGIN(comment); CommentDepth++; }
+<comment>[^*/]*         /* eat anything that's not a '*' or '/' */
+<comment>"*"+[^*/]*     /* eat up '*'s not followed by '/'s */
+<comment>"/*"           { ++CommentDepth; }
+<comment>"/"+[^*]*      /* eat up /'s not followed by *'s */
+<comment>"*"+"/"        { if (!--CommentDepth) { BEGIN(INITIAL); } }
+<comment><<EOF>>        { fprintf(stderr, "Unterminated comment!\n"); abort(); }
+
 %%