[cfe-dev] clang unable to build example C file
clattner at apple.com
Thu Oct 11 14:41:39 PDT 2007
On Oct 11, 2007, at 1:20 PM, Török Edvin wrote:
> On 10/11/07, Chris Lattner <clattner at apple.com> wrote:
>> Ok, very strange. As Anton mentioned, please try with a debug
>> build. This should give us line numbers which will make it easier to
>> identify the problem.
> Thank for the quick patch yesterday.
> See the results of running valgrind on a debug build of llvm r42868 at
> the end of this mail.
> ==25125== Conditional jump or move depends on uninitialised value(s)
> ==25125== at 0x687876: clang::IdentifierInfo::getPPKeywordID()
> const (IdentifierTable.cpp:160)
> I added a printf("%lu\n",Len); before "if (Len < 2) return
> $ clang t.c 2>/dev/null| sort |uniq -c
> 85 0
> I get all zeros, which is not what I expected.
> Where is Len set? I could try to add some printfs there...
It is somewhat convoluted, but len is set when the identifier is
lexed. The codepath is through the
StringMap<IdentifierInfo>::GetOrCreateValue method, which calls
StringMapEntry<IdentifierInfo>::Create, which sets the size on line
155 of llvm/include/llvm/ADT/StringMap.h.
I don't see how there could be a problem here, everything looks
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