[compiler-rt] Set asan win 64-bits to use dynamic address for memory allocator

[etienneb]

Summary

ASAN on Windows 64-bits should use a dynamic address instead of a fixed one.
The asan-allocator code to support dynamic address is already landed.
This patch is turning on the feature.

[etienneb]

The code was previously fixed by: https://reviews.llvm.org/D23170

[rnk]

lgtm, just had to verify that the allocator actually handles that.

lib/asan/asan_allocator.h

135

512G, maybe?

[etienneb]

fix missing decl

[etienneb]

I ran the test on win7, and it's working fine:

D:\src\llvm\ninja64>ninja check-asan
-- Testing: 543 tests, 16 threads --
Testing: 0 .. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
Testing Time: 69.00s
  Expected Passes    : 377
  Expected Failures  : 16
  Unsupported Tests  : 150

But, on win7 I still need that extra patch:

Index: lib/asan/asan_mapping.h
===================================================================
--- lib/asan/asan_mapping.h     (revision 281512)
+++ lib/asan/asan_mapping.h     (working copy)
@@ -140,7 +140,7 @@
 static const u64 kFreeBSD_ShadowOffset32 = 1ULL << 30;  // 0x40000000
 static const u64 kFreeBSD_ShadowOffset64 = 1ULL << 46;  // 0x400000000000
 static const u64 kWindowsShadowOffset32 = 3ULL << 28;  // 0x30000000
-static const u64 kWindowsShadowOffset64 = 1ULL << 45;  // 32TB
+static const u64 kWindowsShadowOffset64 = 1ULL << 41;  // 32TB

 #define SHADOW_SCALE kDefaultShadowScale

Until we landed this:

https://reviews.llvm.org/D24575
https://reviews.llvm.org/D23354

As I get it, no build bots should be broken.
If not, please revert this patch and I'm gonna find the right way to make it happens.

lib/asan/asan_allocator.h

 const uptr kAllocatorSize  =  0x2000000000ULL;  // 128G.
 typedef VeryCompactSizeClassMap SizeClassMap;
 # elif defined(__aarch64__)
 // AArch64/SANITIZER_CAN_USER_ALLOCATOR64 is only for 42-bit VMA
 // so no need to different values for different VMA.
 const uptr kAllocatorSpace =  0x10000000000ULL;
 const uptr kAllocatorSize  =  0x10000000000ULL;  // 3T.
 typedef DefaultSizeClassMap SizeClassMap;
+# elif SANITIZER_WINDOWS
+const uptr kAllocatorSpace = ~(uptr)0;
+const uptr kAllocatorSize  =  0x8000000000ULL;  // 500G
+typedef DefaultSizeClassMap SizeClassMap;
 # else
 const uptr kAllocatorSpace = 0x600000000000ULL;
 const uptr kAllocatorSize  =  0x40000000000ULL;  // 4T.
 typedef DefaultSizeClassMap SizeClassMap;
 # endif
 struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
   static const uptr kSpaceBeg = kAllocatorSpace;
   static const uptr kSpaceSize = kAllocatorSize;