[LLVMbugs] [Bug 13761] New: Passing a temp struct using a reference behaves badly with -faddress-sanitizer [Windows]

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13761

             Bug #: 13761
           Summary: Passing a temp struct using a reference behaves badly
                    with -faddress-sanitizer [Windows]
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: timurrrr at google.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


As of r163111,
----------------------------
$ cat header.h
struct S {
  explicit S(const char *p);
  const char *a, *b;
};
----------------------------
$ cat with_cl.cpp
#include "header.h"

extern "C" int printf(const char *fmt, ...);

void foo(struct S &s) {
  printf("a = %p\nb = %p\n", s.a, s.b);
}

int main() {
  foo(S((char*)0x42));
}
----------------------------
$ cat with_clang.cpp
#include "header.h"

S::S(const char *p) : a(p), b(p) {}
----------------------------

$ cl -Zi -nologo -c with_cl.cpp with_clang.cpp && link -nologo with_cl.obj
with_clang.obj && ./with_cl.exe
a = 00000042
b = 00000042  # OK

$ clang -Xclang -cxx-abi -Xclang microsoft -c with_clang.cpp && cl -nologo -c
with_cl.cpp && link -nologo with_cl.obj with_clang.o
C:/src/asan/rtl/lib/asan/asan_rtl.lib && ./with_cl.exe
with_cl.cpp
a = 00000042
b = 00000042  # OK

$ clang -faddress-sanitizer -Xclang -cxx-abi -Xclang microsoft -c
with_clang.cpp && cl -nologo -c with_cl.cpp && link -nologo with_cl.obj
with_clang.o asan_rtl.lib && ./with_cl.exe
with_cl.cpp
a = 00000042
b = 0018FF88  # OOPS!

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