Bigfoot/Bigfoot/Sources/Utils/MimallocImpl.cpp

/*********************************************************************
 * \file   MimallocImpl.cpp
 *
 * \author Romain BOULLARD
 * \date   October 2025
 *********************************************************************/
// NOLINTBEGIN
#include <Utils/Profiler.hpp>

#if defined BIGFOOT_WINDOWS
#pragma comment(linker, "/include:mi_version")
#pragma warning(disable: 4100 4559)
#elif defined BIGFOOT_LINUX
#if defined(__GNUC__) && !defined(__llvm__) && !defined(__INTEL_COMPILER)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#else
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-parameter"
#endif
#endif

// Taken from mimalloc-new-delete.h

// clang-format off

// ----------------------------------------------------------------------------
// This header provides convenient overrides for the new and
// delete operations in C++.
//
// This header should be included in only one source file!
//
// On Windows, or when linking dynamically with mimalloc, these
// can be more performant than the standard new-delete operations.
// See <https://en.cppreference.com/w/cpp/memory/new/operator_new>
// ---------------------------------------------------------------------------
#if defined(__cplusplus)
  #include <new>
  #include <mimalloc.h>

  #if defined(_MSC_VER) && defined(_Ret_notnull_) && defined(_Post_writable_byte_size_)
  // stay consistent with VCRT definitions
  #define mi_decl_new(n)          mi_decl_nodiscard mi_decl_restrict _Ret_notnull_ _Post_writable_byte_size_(n)
  #define mi_decl_new_nothrow(n)  mi_decl_nodiscard mi_decl_restrict _Ret_maybenull_ _Success_(return != NULL) _Post_writable_byte_size_(n)
  #else
  #define mi_decl_new(n)          mi_decl_nodiscard mi_decl_restrict
  #define mi_decl_new_nothrow(n)  mi_decl_nodiscard mi_decl_restrict
  #endif

  void operator delete(void* p) noexcept              { mi_free(p); BIGFOOT_PROFILER_MEMORY_FREE(p); };
  void operator delete[](void* p) noexcept            { mi_free(p); BIGFOOT_PROFILER_MEMORY_FREE(p); };

  void operator delete  (void* p, const std::nothrow_t&) noexcept { mi_free(p); BIGFOOT_PROFILER_MEMORY_FREE(p); }
  void operator delete[](void* p, const std::nothrow_t&) noexcept { mi_free(p); BIGFOOT_PROFILER_MEMORY_FREE(p); }

  mi_decl_new(n) void* operator new(std::size_t n) noexcept(false) { void* p = mi_new(n); BIGFOOT_PROFILER_MEMORY_ALLOC(p, n); return p; }
  mi_decl_new(n) void* operator new[](std::size_t n) noexcept(false) { void* p = mi_new(n); BIGFOOT_PROFILER_MEMORY_ALLOC(p, n); return p; }

  mi_decl_new_nothrow(n) void* operator new  (std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); void* p = mi_new_nothrow(n); BIGFOOT_PROFILER_MEMORY_ALLOC(p, n); return p; }
  mi_decl_new_nothrow(n) void* operator new[](std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); void* p = mi_new_nothrow(n); BIGFOOT_PROFILER_MEMORY_ALLOC(p, n); return p; }

  // Not from mimalloc-new-delete.h, but necessary for EASTL
  void* operator new[](size_t size, const char* name, int flags, unsigned debugFlags, const char* file, int line) noexcept(false) { void* p = mi_new(size); BIGFOOT_PROFILER_MEMORY_ALLOC(p, size); return p; }

  #if (__cplusplus >= 201402L || _MSC_VER >= 1916)
  void operator delete  (void* p, std::size_t n) noexcept { mi_free_size(p,n); BIGFOOT_PROFILER_MEMORY_FREE(p); };
  void operator delete[](void* p, std::size_t n) noexcept { mi_free_size(p,n); BIGFOOT_PROFILER_MEMORY_FREE(p); };
  #endif

  #if (__cplusplus > 201402L || defined(__cpp_aligned_new))
  void operator delete  (void* p, std::align_val_t al) noexcept { mi_free_aligned(p, static_cast<size_t>(al)); BIGFOOT_PROFILER_MEMORY_FREE(p); }
  void operator delete[](void* p, std::align_val_t al) noexcept { mi_free_aligned(p, static_cast<size_t>(al)); BIGFOOT_PROFILER_MEMORY_FREE(p); }
  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)); BIGFOOT_PROFILER_MEMORY_FREE(p); };
  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)); BIGFOOT_PROFILER_MEMORY_FREE(p); };
  void operator delete  (void* p, std::align_val_t al, const std::nothrow_t&) noexcept { mi_free_aligned(p, static_cast<size_t>(al)); BIGFOOT_PROFILER_MEMORY_FREE(p); }
  void operator delete[](void* p, std::align_val_t al, const std::nothrow_t&) noexcept { mi_free_aligned(p, static_cast<size_t>(al)); BIGFOOT_PROFILER_MEMORY_FREE(p); }

  void* operator new  (std::size_t n, std::align_val_t al) noexcept(false) { void* p = mi_new_aligned(n, static_cast<size_t>(al)); BIGFOOT_PROFILER_MEMORY_ALLOC(p, n); return p; }
  void* operator new[](std::size_t n, std::align_val_t al) noexcept(false) { void* p = mi_new_aligned(n, static_cast<size_t>(al)); BIGFOOT_PROFILER_MEMORY_ALLOC(p, n); return p; }
  void* operator new  (std::size_t n, std::align_val_t al, const std::nothrow_t&) noexcept { void* p = mi_new_aligned_nothrow(n, static_cast<size_t>(al)); BIGFOOT_PROFILER_MEMORY_ALLOC(p, n); return p; }
  void* operator new[](std::size_t n, std::align_val_t al, const std::nothrow_t&) noexcept { void* p = mi_new_aligned_nothrow(n, static_cast<size_t>(al)); BIGFOOT_PROFILER_MEMORY_ALLOC(p, n); return p; }

  // Not from mimalloc-new-delete.h, but necessary for EASTL
  void* operator new[](size_t size, size_t alignment, size_t alignmentOffset, const char* pName, int flags, unsigned debugFlags, const char* file, int line) noexcept(false) { void* p = mi_new_aligned(size, alignment); BIGFOOT_PROFILER_MEMORY_ALLOC(p, size); return p; }
  #endif

#endif

// clang-format on

#if defined BIGFOOT_WINDOWS
#pragma warning(default: 4100 4559)
#elif defined BIGFOOT_LINUX
#if defined(__GNUC__) && !defined(__llvm__) && !defined(__INTEL_COMPILER)
#pragma GCC diagnostic pop
#else
#pragma clang diagnostic pop
#endif
#endif
// NOLINTEND