[LLVMbugs] [Bug 9750] New: LLVM miscompiles even more functions from Wine, part 7

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Apr 19 09:44:40 PDT 2011


           Summary: LLVM miscompiles even more functions from Wine, part 7
           Product: clang
           Version: 2.8
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: miscompilation
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: austinenglish at gmail.com
                CC: llvmbugs at cs.uiuc.edu, cdavis at mymail.mines.edu

Created an attachment (id=6485)
 --> (http://llvm.org/bugs/attachment.cgi?id=6485)
preproccessed file

Compiling wine's msvcp90/test/string.c file with clang causes the string test
to crash on running:
austin at midna:~/wine-clang/dlls/msvcp90/tests$ rm string.o ; clang -m32 -c -I.
-I. -I../../../include -I../../../include -I../../../include/msvcrt
-pipe -fno-strict-aliasing -Wdeclaration-after-statement -Wstrict-prototypes
-Wtype-limits -Wwrite-strings -Wpointer-arith  -std=gnu89 -g -fno-builtin -o
string.o string.c && make && make string.ok:
wine: Unhandled page fault on execute access to 0x00000000 at address (nil)
(thread 0009), starting debugger...
Unhandled exception: page fault on execute access to 0x00000000 in 32-bit code
Register dump:
 CS:0023 SS:002b DS:002b ES:002b FS:0063 GS:006b
 EIP:00000000 ESP:0032fcd8 EBP:68187ff4 EFLAGS:00010202(  R- --  I   - - - )
 EAX:5561cff4 EBX:7b8acf00 ECX:0032fcc4 EDX:0032fcc4
 ESI:74736500 EDI:00720020
Stack dump:
0x0032fcd8:  0000000f 0000032d 7b86ec60 68187ff4
0x0032fce8:  0032fd18 6817ed18 00000001 7ffd8000
0x0032fcf8:  7ffd8000 0000032d 0032fd78 68184dd6
0x0032fd08:  68187ff4 0032fe38 7b86ec60 68187ff4
0x0032fd18:  0032fd78 68184364 00110410 0000000c
0x0032fd28:  ffffffff 00000000 0132fd58 0032fe38
=>0 0x00000000 (0x68187ff4)
  1 0x00000000 (0x0001bef4)
  2 0x00000000 (0x00000000)
0x00000000: addb    %al,0x0(%eax)

compiling that file with gcc works fine. I believe this also occurred in trunk,
will verify on another machine when time permits.

Attaching the output of clang -m32 -E -I. -I. -I../../../include
-I../../../include -I../../../include/msvcrt -DWINE_STRICT_PROTOTYPES
-fno-strict-aliasing -Wdeclaration-after-statement -Wstrict-prototypes
-Wtype-limits -Wwrite-strings -Wpointer-arith  -std=gnu89 -g -fno-builtin -o
string.i string.c

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