[compiler-rt] r220571 - tsan: support mmap(MAP_32BIT)

[Alexey Samsonov]

On Mon, Jan 19, 2015 at 8:03 PM, Dmitry Vyukov <dvyukov at google.com> wrote:

> On Fri, Jan 16, 2015 at 6:05 PM, Alexey Samsonov <vonosmas at gmail.com>
> wrote:
> >
> > On Wed, Jan 14, 2015 at 6:05 PM, Dmitry Vyukov <dvyukov at google.com>
> wrote:
> >>
> >> Do you mean linux/C++ and 0x020000000000 - 0x100000000000 memory range?
> >> If so, I don't see what is broken.
> >> I've added the following debug output:
> >>
> >> +  Printf("kShadowBeg=%p kHiAppMemBeg=%p shadow=%p ok=%d\n",
> >> +      kShadowBeg, kHiAppMemBeg, MemToShadow(kHiAppMemBeg),
> >> IsShadowMem(MemToShadow(kHiAppMemBeg)));
> >
> >
> > Have you tried to build and run runtime with TSAN_SHADOW_COUNT=2 ?
> > uptr MemToShadow(uptr x) {
> > 78  DCHECK(IsAppMem(x));
> > 79  return (((x) & ~(kAppMemMsk | (kShadowCell - 1)))
> > 80      ^ kAppMemXor) * kShadowCnt;
> >
> > const uptr kHiAppMemBeg   = 0x7e8000000000ull;
> > const uptr kAppMemMsk     = 0x7c0000000000ull;
> > const uptr kAppMemXor     = 0x020000000000ull;
> >
> > x = 0x7e8000000000ull
> > y = (x) & ~(kAppMemMsk | (kShadowCell - 1)) = 0x028000000000ull;
> > z = y ^ kAppMemXor = 0x008000000000ull;
> > z * kShadowCnt = z * 2 = 0x010000000000ull;
>
>
> OK, now I see.
> There is no simple way to fix it, removed in rev 226466.
>

Thank you!

-- 
Alexey Samsonov
vonosmas at gmail.com
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