44 lines
909 B
C++
44 lines
909 B
C++
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// adapted from https://github.com/mifki/df-sizecheck/blob/master/b.cpp
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// usage:
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// linux: PRELOAD_LIB=hack/libsizecheck.so ./dfhack
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <memory>
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using namespace std;
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const uint32_t MAGIC = 0xdfdf4ac8;
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void* alloc(size_t n) {
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void* addr;
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if (posix_memalign(&addr, 32, n + 16) != 0) {
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return addr;
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}
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memset(addr, 0, 16);
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*(size_t*)addr = n;
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*(uint32_t*)((uint8_t*)addr + 8) = MAGIC;
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return (uint8_t*)addr + 16;
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}
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void dealloc(void* addr) {
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if (intptr_t(addr) % 32 == 16 && *(size_t*)((uint8_t*)addr - 8) == MAGIC) {
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addr = (void*)((uint8_t*)addr - 16);
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}
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free(addr);
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}
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void* operator new (size_t n, const nothrow_t& tag) {
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return alloc(n);
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}
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void* operator new (size_t n) {
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return alloc(n);
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}
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void operator delete (void* addr) {
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return dealloc(addr);
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}
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