/* ---------------------------------------------------------------------------- Copyright (c) 2018-2021, Microsoft Research, Daan Leijen This is free software; you can redistribute it and/or modify it under the terms of the MIT license. A copy of the license can be found in the file "LICENSE" at the root of this distribution. -----------------------------------------------------------------------------*/ #if !defined(MI_IN_ALLOC_C) #error "this file should be included from 'alloc.c' (so aliases can work)" #endif #if defined(MI_MALLOC_OVERRIDE) && defined(_WIN32) && !(defined(MI_SHARED_LIB) && defined(_DLL)) #error "It is only possible to override "malloc" on Windows when building as a DLL (and linking the C runtime as a DLL)" #endif #if defined(MI_MALLOC_OVERRIDE) && !(defined(_WIN32)) #if defined(__APPLE__) #include <AvailabilityMacros.h> mi_decl_externc void vfree(void* p); mi_decl_externc size_t malloc_size(const void* p); mi_decl_externc size_t malloc_good_size(size_t size); #endif // helper definition for C override of C++ new typedef struct mi_nothrow_s { int _tag; } mi_nothrow_t; // ------------------------------------------------------ // Override system malloc // ------------------------------------------------------ #if (defined(__GNUC__) || defined(__clang__)) && !defined(__APPLE__) && !MI_TRACK_ENABLED // gcc, clang: use aliasing to alias the exported function to one of our `mi_` functions #if (defined(__GNUC__) && __GNUC__ >= 9) #pragma GCC diagnostic ignored "-Wattributes" // or we get warnings that nodiscard is ignored on a forward #define MI_FORWARD … #else #define MI_FORWARD … #endif #define MI_FORWARD1 … #define MI_FORWARD2 … #define MI_FORWARD3 … #define MI_FORWARD0 … #define MI_FORWARD02 … #else // otherwise use forwarding by calling our `mi_` function #define MI_FORWARD1 … #define MI_FORWARD2 … #define MI_FORWARD3 … #define MI_FORWARD0 … #define MI_FORWARD02 … #endif #if defined(__APPLE__) && defined(MI_SHARED_LIB_EXPORT) && defined(MI_OSX_INTERPOSE) // define MI_OSX_IS_INTERPOSED as we should not provide forwarding definitions for // functions that are interposed (or the interposing does not work) #define MI_OSX_IS_INTERPOSED mi_decl_externc size_t mi_malloc_size_checked(void *p) { if (!mi_is_in_heap_region(p)) return 0; return mi_usable_size(p); } // use interposing so `DYLD_INSERT_LIBRARIES` works without `DYLD_FORCE_FLAT_NAMESPACE=1` // See: <https://books.google.com/books?id=K8vUkpOXhN4C&pg=PA73> struct mi_interpose_s { const void* replacement; const void* target; }; #define MI_INTERPOSE_FUN … #define MI_INTERPOSE_MI … __attribute__((used)) static struct mi_interpose_s _mi_interposes[] __attribute__((section("__DATA, __interpose"))) = { MI_INTERPOSE_MI(malloc), MI_INTERPOSE_MI(calloc), MI_INTERPOSE_MI(realloc), MI_INTERPOSE_MI(strdup), MI_INTERPOSE_MI(strndup), MI_INTERPOSE_MI(realpath), MI_INTERPOSE_MI(posix_memalign), MI_INTERPOSE_MI(reallocf), MI_INTERPOSE_MI(valloc), MI_INTERPOSE_FUN(malloc_size,mi_malloc_size_checked), MI_INTERPOSE_MI(malloc_good_size), #if defined(MAC_OS_X_VERSION_10_15) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_15 MI_INTERPOSE_MI(aligned_alloc), #endif #ifdef MI_OSX_ZONE // we interpose malloc_default_zone in alloc-override-osx.c so we can use mi_free safely MI_INTERPOSE_MI(free), MI_INTERPOSE_FUN(vfree,mi_free), #else // sometimes code allocates from default zone but deallocates using plain free :-( (like NxHashResizeToCapacity <https://github.com/nneonneo/osx-10.9-opensource/blob/master/objc4-551.1/runtime/hashtable2.mm>) MI_INTERPOSE_FUN(free,mi_cfree), // use safe free that checks if pointers are from us MI_INTERPOSE_FUN(vfree,mi_cfree), #endif }; #ifdef __cplusplus extern "C" { #endif void _ZdlPv(void* p); // delete void _ZdaPv(void* p); // delete[] void _ZdlPvm(void* p, size_t n); // delete void _ZdaPvm(void* p, size_t n); // delete[] void* _Znwm(size_t n); // new void* _Znam(size_t n); // new[] void* _ZnwmRKSt9nothrow_t(size_t n, mi_nothrow_t tag); // new nothrow void* _ZnamRKSt9nothrow_t(size_t n, mi_nothrow_t tag); // new[] nothrow #ifdef __cplusplus } #endif __attribute__((used)) static struct mi_interpose_s _mi_cxx_interposes[] __attribute__((section("__DATA, __interpose"))) = { MI_INTERPOSE_FUN(_ZdlPv,mi_free), MI_INTERPOSE_FUN(_ZdaPv,mi_free), MI_INTERPOSE_FUN(_ZdlPvm,mi_free_size), MI_INTERPOSE_FUN(_ZdaPvm,mi_free_size), MI_INTERPOSE_FUN(_Znwm,mi_new), MI_INTERPOSE_FUN(_Znam,mi_new), MI_INTERPOSE_FUN(_ZnwmRKSt9nothrow_t,mi_new_nothrow), MI_INTERPOSE_FUN(_ZnamRKSt9nothrow_t,mi_new_nothrow), }; #elif defined(_MSC_VER) // cannot override malloc unless using a dll. // we just override new/delete which does work in a static library. #else // On all other systems forward to our API mi_decl_export void* malloc(size_t size) MI_FORWARD1(mi_malloc, size) mi_decl_export void* calloc(size_t size, size_t n) MI_FORWARD2(mi_calloc, size, n) mi_decl_export void* realloc(void* p, size_t newsize) MI_FORWARD2(mi_realloc, p, newsize) mi_decl_export void free(void* p) MI_FORWARD0(mi_free, p) #endif #if (defined(__GNUC__) || defined(__clang__)) && !defined(__APPLE__) #pragma GCC visibility push(default) #endif // ------------------------------------------------------ // Override new/delete // This is not really necessary as they usually call // malloc/free anyway, but it improves performance. // ------------------------------------------------------ #ifdef __cplusplus // ------------------------------------------------------ // With a C++ compiler we override the new/delete operators. // see <https://en.cppreference.com/w/cpp/memory/new/operator_new> // ------------------------------------------------------ #include <new> #ifndef MI_OSX_IS_INTERPOSED void operator delete(void* p) noexcept MI_FORWARD0(mi_free,p) void operator delete[](void* p) noexcept MI_FORWARD0(mi_free,p) void* operator new(std::size_t n) noexcept(false) MI_FORWARD1(mi_new,n) void* operator new[](std::size_t n) noexcept(false) MI_FORWARD1(mi_new,n) void* operator new (std::size_t n, const std::nothrow_t& tag) noexcept { MI_UNUSED(tag); return mi_new_nothrow(n); } void* operator new[](std::size_t n, const std::nothrow_t& tag) noexcept { MI_UNUSED(tag); return mi_new_nothrow(n); } #if (__cplusplus >= 201402L || _MSC_VER >= 1916) void operator delete (void* p, std::size_t n) noexcept MI_FORWARD02(mi_free_size,p,n) void operator delete[](void* p, std::size_t n) noexcept MI_FORWARD02(mi_free_size,p,n) #endif #endif #if (__cplusplus > 201402L && defined(__cpp_aligned_new)) && (!defined(__GNUC__) || (__GNUC__ > 5)) void operator delete (void* p, std::align_val_t al) noexcept { mi_free_aligned(p, static_cast<size_t>(al)); } void operator delete[](void* p, std::align_val_t al) noexcept { mi_free_aligned(p, static_cast<size_t>(al)); } void operator delete (void* p, std::size_t n, std::align_val_t al) noexcept { mi_free_size_aligned(p, n, static_cast<size_t>(al)); }; void operator delete[](void* p, std::size_t n, std::align_val_t al) noexcept { mi_free_size_aligned(p, n, static_cast<size_t>(al)); }; void operator delete (void* p, std::align_val_t al, const std::nothrow_t&) noexcept { mi_free_aligned(p, static_cast<size_t>(al)); } void operator delete[](void* p, std::align_val_t al, const std::nothrow_t&) noexcept { mi_free_aligned(p, static_cast<size_t>(al)); } void* operator new( std::size_t n, std::align_val_t al) noexcept(false) { return mi_new_aligned(n, static_cast<size_t>(al)); } void* operator new[]( std::size_t n, std::align_val_t al) noexcept(false) { return mi_new_aligned(n, static_cast<size_t>(al)); } void* operator new (std::size_t n, std::align_val_t al, const std::nothrow_t&) noexcept { return mi_new_aligned_nothrow(n, static_cast<size_t>(al)); } void* operator new[](std::size_t n, std::align_val_t al, const std::nothrow_t&) noexcept { return mi_new_aligned_nothrow(n, static_cast<size_t>(al)); } #endif #elif (defined(__GNUC__) || defined(__clang__)) // ------------------------------------------------------ // Override by defining the mangled C++ names of the operators (as // used by GCC and CLang). // See <https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling> // ------------------------------------------------------ void _ZdlPv(void* p) MI_FORWARD0(mi_free,p) // delete void _ZdaPv(void* p) MI_FORWARD0(mi_free,p) // delete[] void _ZdlPvm(void* p, size_t n) MI_FORWARD02(mi_free_size,p,n) void _ZdaPvm(void* p, size_t n) MI_FORWARD02(mi_free_size,p,n) void _ZdlPvSt11align_val_t(void* p, size_t al) { mi_free_aligned(p,al); } void _ZdaPvSt11align_val_t(void* p, size_t al) { mi_free_aligned(p,al); } void _ZdlPvmSt11align_val_t(void* p, size_t n, size_t al) { mi_free_size_aligned(p,n,al); } void _ZdaPvmSt11align_val_t(void* p, size_t n, size_t al) { mi_free_size_aligned(p,n,al); } #if (MI_INTPTR_SIZE==8) void* _Znwm(size_t n) MI_FORWARD1(mi_new,n) // new 64-bit void* _Znam(size_t n) MI_FORWARD1(mi_new,n) // new[] 64-bit void* _ZnwmRKSt9nothrow_t(size_t n, mi_nothrow_t tag) { MI_UNUSED(tag); return mi_new_nothrow(n); } void* _ZnamRKSt9nothrow_t(size_t n, mi_nothrow_t tag) { MI_UNUSED(tag); return mi_new_nothrow(n); } void* _ZnwmSt11align_val_t(size_t n, size_t al) MI_FORWARD2(mi_new_aligned, n, al) void* _ZnamSt11align_val_t(size_t n, size_t al) MI_FORWARD2(mi_new_aligned, n, al) void* _ZnwmSt11align_val_tRKSt9nothrow_t(size_t n, size_t al, mi_nothrow_t tag) { MI_UNUSED(tag); return mi_new_aligned_nothrow(n,al); } void* _ZnamSt11align_val_tRKSt9nothrow_t(size_t n, size_t al, mi_nothrow_t tag) { MI_UNUSED(tag); return mi_new_aligned_nothrow(n,al); } #elif (MI_INTPTR_SIZE==4) void* _Znwj(size_t n) MI_FORWARD1(mi_new,n) // new 64-bit void* _Znaj(size_t n) MI_FORWARD1(mi_new,n) // new[] 64-bit void* _ZnwjRKSt9nothrow_t(size_t n, mi_nothrow_t tag) { MI_UNUSED(tag); return mi_new_nothrow(n); } void* _ZnajRKSt9nothrow_t(size_t n, mi_nothrow_t tag) { MI_UNUSED(tag); return mi_new_nothrow(n); } void* _ZnwjSt11align_val_t(size_t n, size_t al) MI_FORWARD2(mi_new_aligned, n, al) void* _ZnajSt11align_val_t(size_t n, size_t al) MI_FORWARD2(mi_new_aligned, n, al) void* _ZnwjSt11align_val_tRKSt9nothrow_t(size_t n, size_t al, mi_nothrow_t tag) { MI_UNUSED(tag); return mi_new_aligned_nothrow(n,al); } void* _ZnajSt11align_val_tRKSt9nothrow_t(size_t n, size_t al, mi_nothrow_t tag) { MI_UNUSED(tag); return mi_new_aligned_nothrow(n,al); } #else #error "define overloads for new/delete for this platform (just for performance, can be skipped)" #endif #endif // __cplusplus // ------------------------------------------------------ // Further Posix & Unix functions definitions // ------------------------------------------------------ #ifdef __cplusplus extern "C" { #endif #ifndef MI_OSX_IS_INTERPOSED // Forward Posix/Unix calls as well void* reallocf(void* p, size_t newsize) MI_FORWARD2(mi_reallocf,p,newsize) size_t malloc_size(const void* p) MI_FORWARD1(mi_usable_size,p) #if !defined(__ANDROID__) && !defined(__FreeBSD__) size_t malloc_usable_size(void *p) MI_FORWARD1(mi_usable_size,p) #else size_t malloc_usable_size(const void *p) MI_FORWARD1(mi_usable_size,p) #endif // No forwarding here due to aliasing/name mangling issues void* valloc(size_t size) { return mi_valloc(size); } void vfree(void* p) { mi_free(p); } size_t malloc_good_size(size_t size) { return mi_malloc_good_size(size); } int posix_memalign(void** p, size_t alignment, size_t size) { return mi_posix_memalign(p, alignment, size); } // `aligned_alloc` is only available when __USE_ISOC11 is defined. // Note: it seems __USE_ISOC11 is not defined in musl (and perhaps other libc's) so we only check // for it if using glibc. // Note: Conda has a custom glibc where `aligned_alloc` is declared `static inline` and we cannot // override it, but both _ISOC11_SOURCE and __USE_ISOC11 are undefined in Conda GCC7 or GCC9. // Fortunately, in the case where `aligned_alloc` is declared as `static inline` it // uses internally `memalign`, `posix_memalign`, or `_aligned_malloc` so we can avoid overriding it ourselves. #if !defined(__GLIBC__) || __USE_ISOC11 void* aligned_alloc(size_t alignment, size_t size) { return mi_aligned_alloc(alignment, size); } #endif #endif // no forwarding here due to aliasing/name mangling issues void cfree(void* p) { mi_free(p); } void* pvalloc(size_t size) { return mi_pvalloc(size); } void* reallocarray(void* p, size_t count, size_t size) { return mi_reallocarray(p, count, size); } int reallocarr(void* p, size_t count, size_t size) { return mi_reallocarr(p, count, size); } void* memalign(size_t alignment, size_t size) { return mi_memalign(alignment, size); } void* _aligned_malloc(size_t alignment, size_t size) { return mi_aligned_alloc(alignment, size); } #if defined(__wasi__) // forward __libc interface (see PR #667) void* __libc_malloc(size_t size) MI_FORWARD1(mi_malloc, size) void* __libc_calloc(size_t count, size_t size) MI_FORWARD2(mi_calloc, count, size) void* __libc_realloc(void* p, size_t size) MI_FORWARD2(mi_realloc, p, size) void __libc_free(void* p) MI_FORWARD0(mi_free, p) void* __libc_memalign(size_t alignment, size_t size) { return mi_memalign(alignment, size); } #elif defined(__GLIBC__) && defined(__linux__) // forward __libc interface (needed for glibc-based Linux distributions) void* __libc_malloc(size_t size) MI_FORWARD1(mi_malloc,size) void* __libc_calloc(size_t count, size_t size) MI_FORWARD2(mi_calloc,count,size) void* __libc_realloc(void* p, size_t size) MI_FORWARD2(mi_realloc,p,size) void __libc_free(void* p) MI_FORWARD0(mi_free,p) void __libc_cfree(void* p) MI_FORWARD0(mi_free,p) void* __libc_valloc(size_t size) { return mi_valloc(size); } void* __libc_pvalloc(size_t size) { return mi_pvalloc(size); } void* __libc_memalign(size_t alignment, size_t size) { return mi_memalign(alignment,size); } int __posix_memalign(void** p, size_t alignment, size_t size) { return mi_posix_memalign(p,alignment,size); } #endif #ifdef __cplusplus } #endif #if (defined(__GNUC__) || defined(__clang__)) && !defined(__APPLE__) #pragma GCC visibility pop #endif #endif // MI_MALLOC_OVERRIDE && !_WIN32
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