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//===-- tsan_allocator-------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
//===----------------------------------------------------------------------===//
#include "tsan_allocator.h"
// Provisional implementation.
extern "C" void *__libc_malloc(__tsan::uptr size);
extern "C" void __libc_free(void *ptr);
namespace __tsan {
u64 kBlockMagic = 0x6A6CB03ABCEBC041ull;
void AllocInit() {
}
void *Alloc(uptr sz) {
void *p = __libc_malloc(sz + sizeof(u64));
((u64*)p)[0] = kBlockMagic;
return (char*)p + sizeof(u64);
}
void Free(void *p) {
CHECK_NE(p, (char*)0);
p = (char*)p - sizeof(u64);
CHECK_EQ(((u64*)p)[0], kBlockMagic);
((u64*)p)[0] = 0;
__libc_free(p);
}
void *AllocBlock(void *p) {
CHECK_NE(p, (void*)0);
u64 *pp = (u64*)((uptr)p & ~0x7);
for (; pp[0] != kBlockMagic; pp--) {}
return pp + 1;
}
} // namespace __tsan
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