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Quelle pure_virtual.c Sprache: C |
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/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include <mozilla/Assertions.h> // This function is used in vtables to point at pure virtual methods. // The implementation in the standard library usually aborts, but // the function is normally never called (a call would be a bug). // Each of these entries in vtables, however, require an unnecessary // dynamic relocation. Defining our own function makes the linker // point the vtables here instead of the standard library, replacing // the dynamic relocations with relative relocations. // // On Windows, it doesn't really make a difference, but on macOS it // can be packed better, saving about 10KB in libxul, and on 64-bits // ELF systems, with packed relative relocations, it saves 140KB. // // Another advantage of having our own is that we can use MOZ_CRASH // instead of the system's abort. #ifdef _MSC_VER int __cdecl _purecall() { MOZ_CRASH("pure virtual call"); } #else __attribute__((visibility("hidden"))) void __cxa_pure_virtual() { MOZ_CRASH("pure virtual call"); } #endif
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2026-04-04