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[sanitizer_common] Introduce SANITIZER_MMAP_BEGIN macro #147645

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[sanitizer_common] Introduce SANITIZER_MMAP_BEGIN macro #147645

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01ac087
Introduce SANITIZER_MMAP_BEGIN
jakeegan Jul 9, 2025
f43c06c
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jakeegan Jul 9, 2025
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2 changes: 1 addition & 1 deletion compiler-rt/lib/asan/asan_allocator.h
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Original file line number Diff line number Diff line change
Expand Up @@ -239,7 +239,7 @@ using PrimaryAllocator = PrimaryAllocatorASVT<LocalAddressSpaceView>;
typedef CompactSizeClassMap SizeClassMap;
template <typename AddressSpaceViewTy>
struct AP32 {
static const uptr kSpaceBeg = 0;
static const uptr kSpaceBeg = SANITIZER_MMAP_BEGIN;
static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
static const uptr kMetadataSize = 0;
typedef __asan::SizeClassMap SizeClassMap;
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2 changes: 1 addition & 1 deletion compiler-rt/lib/lsan/lsan_allocator.h
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Expand Up @@ -53,7 +53,7 @@ struct ChunkMetadata {
#if !SANITIZER_CAN_USE_ALLOCATOR64
template <typename AddressSpaceViewTy>
struct AP32 {
static const uptr kSpaceBeg = 0;
static const uptr kSpaceBeg = SANITIZER_MMAP_BEGIN;
static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
static const uptr kMetadataSize = sizeof(ChunkMetadata);
typedef __sanitizer::CompactSizeClassMap SizeClassMap;
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2 changes: 1 addition & 1 deletion compiler-rt/lib/msan/msan_allocator.cpp
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Expand Up @@ -56,7 +56,7 @@ struct MsanMapUnmapCallback {
const uptr kMaxAllowedMallocSize = 2UL << 30;

struct AP32 {
static const uptr kSpaceBeg = 0;
static const uptr kSpaceBeg = SANITIZER_MMAP_BEGIN;
static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
static const uptr kMetadataSize = sizeof(Metadata);
using SizeClassMap = __sanitizer::CompactSizeClassMap;
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2 changes: 1 addition & 1 deletion compiler-rt/lib/sanitizer_common/sanitizer_allocator_internal.h
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Expand Up @@ -23,7 +23,7 @@ namespace __sanitizer {
typedef CompactSizeClassMap InternalSizeClassMap;

struct AP32 {
static const uptr kSpaceBeg = 0;
static const uptr kSpaceBeg = SANITIZER_MMAP_BEGIN;
static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
static const uptr kMetadataSize = 0;
typedef InternalSizeClassMap SizeClassMap;
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3 changes: 3 additions & 0 deletions compiler-rt/lib/sanitizer_common/sanitizer_platform.h
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Expand Up @@ -318,6 +318,9 @@
# endif
#endif

// The first address that can be returned by mmap.
#define SANITIZER_MMAP_BEGIN 0

// The range of addresses which can be returned my mmap.
// FIXME: this value should be different on different platforms. Larger values
// will still work but will consume more memory for TwoLevelByteMap.
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2 changes: 1 addition & 1 deletion compiler-rt/lib/tsan/rtl/tsan_rtl.h
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Expand Up @@ -62,7 +62,7 @@ struct MapUnmapCallback;
defined(__powerpc__) || SANITIZER_RISCV64

struct AP32 {
static const uptr kSpaceBeg = 0;
static const uptr kSpaceBeg = SANITIZER_MMAP_BEGIN;
static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
static const uptr kMetadataSize = 0;
typedef __sanitizer::CompactSizeClassMap SizeClassMap;
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