'About google AddressSanitizerAlgorithm, how to determine the SHADOW_OFFSET value under different architectures?

https://github.com/google/sanitizers/wiki/AddressSanitizerAlgorithm As we can see in header file 'asan_mapping.h', the SHADOW_OFFSET under different architectures is different:

static const u64 kDefaultShadowOffset32 = 1ULL << 29;  // 0x20000000
static const u64 kDefaultShadowOffset64 = 1ULL << 44;
static const u64 kDefaultShort64bitShadowOffset = 0x7FFF8000;  // < 2G.
static const u64 kIosShadowOffset32 = 1ULL << 30;  // 0x40000000
static const u64 kIosShadowOffset64 = 0x120200000;
static const u64 kIosSimShadowOffset32 = 1ULL << 30;
static const u64 kIosSimShadowOffset64 = kDefaultShadowOffset64;
static const u64 kAArch64_ShadowOffset64 = 1ULL << 36;
static const u64 kMIPS32_ShadowOffset32 = 0x0aaa0000;
static const u64 kMIPS64_ShadowOffset64 = 1ULL << 37;
static const u64 kPPC64_ShadowOffset64 = 1ULL << 41;
static const u64 kSystemZ_ShadowOffset64 = 1ULL << 52;
static const u64 kFreeBSD_ShadowOffset32 = 1ULL << 30;  // 0x40000000
static const u64 kFreeBSD_ShadowOffset64 = 1ULL << 46;  // 0x400000000000
static const u64 kWindowsShadowOffset32 = 3ULL << 28;  // 0x30000000

So, I want to know how to determine this value???

c memory-leaks address-sanitizer java json gradle command-line-arguments gradlew

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'About google AddressSanitizerAlgorithm, how to determine the SHADOW_OFFSET value under different architectures?

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