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

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7429 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-07-30 19:39:36 +00:00
parent 61972242f3
commit d33b8db415
2 changed files with 26 additions and 0 deletions
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13
support/tools/TableGen/FileLexer.l
View File

@ -16,6 +16,7 @@
%option noreject
%option noyymore
%x comment
%{
#include "Record.h"
@ -29,6 +30,8 @@ static int ParseInt(const char *Str) {
return strtol(Str, 0, 0);
}
static int CommentDepth = 0;
%}
Comment \/\/.*
@ -63,4 +66,14 @@ in { return IN; }
[ \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(); }
%%

13
utils/TableGen/FileLexer.l
View File

@ -16,6 +16,7 @@
%option noreject
%option noyymore
%x comment
%{
#include "Record.h"
@ -29,6 +30,8 @@ static int ParseInt(const char *Str) {
return strtol(Str, 0, 0);
}
static int CommentDepth = 0;
%}
Comment \/\/.*
@ -63,4 +66,14 @@ in { return IN; }
[ \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(); }
%%