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[asan] LLVM: Switch to using dynamic shadow offset on iOS

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The VM layout is not stable between iOS version releases, so switch to dynamic shadow offset.

This is the LLVM counterpart of https://reviews.llvm.org/D25218

Differential Revision: https://reviews.llvm.org/D25219

llvm-svn: 283239
This commit is contained in:
Anna Zaks 2016-10-04 19:02:29 +00:00
parent 95d4e72334
commit e1856ce1ee
1 changed files with 3 additions and 2 deletions
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5
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -69,7 +69,6 @@ static const uint64_t kDefaultShadowOffset32 = 1ULL << 29;
static const uint64_t kDefaultShadowOffset64 = 1ULL << 44;
static const uint64_t kDynamicShadowSentinel = ~(uint64_t)0;
static const uint64_t kIOSShadowOffset32 = 1ULL << 30;
static const uint64_t kIOSShadowOffset64 = 0x120200000;
static const uint64_t kIOSSimShadowOffset32 = 1ULL << 30;
static const uint64_t kIOSSimShadowOffset64 = kDefaultShadowOffset64;
static const uint64_t kSmallX86_64ShadowOffset = 0x7FFF8000; // < 2G.
@ -434,7 +433,9 @@ static ShadowMapping getShadowMapping(Triple &TargetTriple, int LongSize,
Mapping.Offset = kMIPS64_ShadowOffset64;
else if (IsIOS)
// If we're targeting iOS and x86, the binary is built for iOS simulator.
Mapping.Offset = IsX86_64 ? kIOSSimShadowOffset64 : kIOSShadowOffset64;
// We are using dynamic shadow offset on the 64-bit devices.
Mapping.Offset =
IsX86_64 ? kIOSSimShadowOffset64 : kDynamicShadowSentinel;
else if (IsAArch64)
Mapping.Offset = kAArch64_ShadowOffset64;
else