[cfe-dev] Clang crash in HTMLDiagnostics

[Nico Weber]

> I started playing around with clang today, and hit a crash in the
> HTMLDiagnostics. Unfortunately I don't have the time to reduce the
> test case right now, but nevertheless I wanted to draw your attention
> to this (maybe it's something obvious for people who know the code).
> I'll try to come up with a testcase that relies only on open source
> code for people to reproduce.

It seems this (or at least something related) happens with any input  
file that produces a warning:

Macintosh-3:clang nico$ cat test.c
int main() {
   char b[10] = "";
   printf(b);
}
Macintosh-3:clang nico$ gdb ../../Debug/bin/clang GNU gdb  
6.3.50-20050815 (Apple version gdb-768) (Tue Oct  2 04:07:49 UTC 2007)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and  
you are
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Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for  
details.
This GDB was configured as "i386-apple-darwin"...Reading symbols for  
shared libraries .... done
^P
(gdb) run -fsyntax-only -html-diags=/Users/nico test.c
Starting program: /Users/nico/src/llvm-svn/Debug/bin/clang -fsyntax- 
only -html-diags=/Users/nico test.c
Reading symbols for shared libraries +++. done
1 diagnostic generated.
Assertion failed: (FileID-1 < FileIDs.size() && "Invalid FileID!"),  
function getFIDInfo, file /Users/nico/src/llvm-svn/tools/clang/ 
Driver/../include/clang/Basic/SourceManager.h, line 453.

Program received signal SIGABRT, Aborted.
0x966eeb9e in __kill ()
(gdb) bt
#0  0x966eeb9e in __kill ()
#1  0x966eeb91 in kill$UNIX2003 ()
#2  0x96765ec2 in raise ()
#3  0x9677547f in abort ()
#4  0x96767063 in __assert_rtn ()
#5  0x00005422 in clang::SourceManager::getFIDInfo (this=0xd02090,  
FileID=1070333358) at SourceManager.h:453
#6  0x00005458 in clang::SourceManager::getContentCache  
(this=0xd02090, FileID=1070333358) at SourceManager.h:458
#7  0x0000e2e0 in clang::SourceManager::getBuffer (this=0xd02090,  
FileID=1070333358) at SourceManager.h:286
#8  0x0000bd77 in (anonymous namespace)::HTMLDiagnostics::HandlePiece  
(this=0xd01fd0, R=@0xbffff468, BugFileID=1070333358, P=@0xd073e0,  
num=1, max=1) at HTMLDiagnostics.cpp:338
#9  0x0000c611 in (anonymous namespace)::HTMLDiagnostics::ReportDiag  
(this=0xd01fd0, D=@0xd07310) at HTMLDiagnostics.cpp:182
#10 0x0000d242 in (anonymous  
namespace)::HTMLDiagnostics::~HTMLDiagnostics (this=0xd01fd0) at  
HTMLDiagnostics.cpp:98
#11 0x00030729 in std::auto_ptr<clang::DiagnosticClient>::~auto_ptr  
(this=0xbffff784) at memory:259
#12 0x0003073d in std::auto_ptr<clang::DiagnosticClient>::~auto_ptr  
(this=0xbffff784) at memory:259
#13 0x0002eb1e in main (argc=4, argv=0xbffff804) at clang.cpp:1515
(gdb) The program is running.  Exit anyway? (y or n) y