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