forked from OSchip/llvm-project
108 lines
3.5 KiB
C++
108 lines
3.5 KiB
C++
//===-- msan_allocator.cc --------------------------- ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of MemorySanitizer.
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//
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// MemorySanitizer allocator.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_allocator.h"
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#include "sanitizer_common/sanitizer_stackdepot.h"
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#include "msan.h"
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namespace __msan {
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struct Metadata {
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uptr requested_size;
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};
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static const uptr kAllocatorSpace = 0x600000000000ULL;
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static const uptr kAllocatorSize = 0x80000000000; // 8T.
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static const uptr kMetadataSize = sizeof(Metadata);
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typedef SizeClassAllocator64<kAllocatorSpace, kAllocatorSize, kMetadataSize,
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DefaultSizeClassMap> PrimaryAllocator;
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typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
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typedef LargeMmapAllocator<> SecondaryAllocator;
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typedef CombinedAllocator<PrimaryAllocator, AllocatorCache,
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SecondaryAllocator> Allocator;
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static THREADLOCAL AllocatorCache cache;
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static Allocator allocator;
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static int inited = 0;
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static inline void Init() {
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if (inited) return;
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__msan_init();
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inited = true; // this must happen before any threads are created.
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allocator.Init();
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}
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static void *MsanAllocate(StackTrace *stack, uptr size,
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uptr alignment, bool zeroise) {
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Init();
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void *res = allocator.Allocate(&cache, size, alignment, false);
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Metadata *meta = reinterpret_cast<Metadata*>(allocator.GetMetaData(res));
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meta->requested_size = size;
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if (zeroise)
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__msan_clear_and_unpoison(res, size);
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else if (flags()->poison_in_malloc)
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__msan_poison(res, size);
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if (__msan_get_track_origins()) {
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u32 stack_id = StackDepotPut(stack->trace, stack->size);
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CHECK(stack_id);
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CHECK_EQ((stack_id >> 31), 0); // Higher bit is occupied by stack origins.
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__msan_set_origin(res, size, stack_id);
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}
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return res;
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}
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void MsanDeallocate(void *p) {
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CHECK(p);
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Init();
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Metadata *meta = reinterpret_cast<Metadata*>(allocator.GetMetaData(p));
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uptr size = meta->requested_size;
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// This memory will not be reused by anyone else, so we are free to keep it
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// poisoned.
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__msan_poison(p, size);
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if (__msan_get_track_origins())
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__msan_set_origin(p, size, -1);
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allocator.Deallocate(&cache, p);
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}
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void *MsanReallocate(StackTrace *stack, void *old_p, uptr new_size,
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uptr alignment, bool zeroise) {
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if (!old_p)
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return MsanAllocate(stack, new_size, alignment, zeroise);
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if (!new_size) {
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MsanDeallocate(old_p);
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return 0;
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}
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Metadata *meta = reinterpret_cast<Metadata*>(allocator.GetMetaData(old_p));
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uptr old_size = meta->requested_size;
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uptr actually_allocated_size = allocator.GetActuallyAllocatedSize(old_p);
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if (new_size <= actually_allocated_size) {
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// We are not reallocating here.
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meta->requested_size = new_size;
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if (new_size > old_size)
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__msan_poison((char*)old_p + old_size, new_size - old_size);
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return old_p;
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}
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uptr memcpy_size = Min(new_size, old_size);
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void *new_p = MsanAllocate(stack, new_size, alignment, zeroise);
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// Printf("realloc: old_size %zd new_size %zd\n", old_size, new_size);
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if (new_p)
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__msan_memcpy(new_p, old_p, memcpy_size);
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MsanDeallocate(old_p);
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return new_p;
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}
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} // namespace __msan
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