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Prevents possible pointer miss-alignment error

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Thomas Hume 2017-02-23 16:33:57 +01:00 committed by Christoph Oelckers
parent 73cceea994
commit 06119987a8
1 changed files with 3 additions and 2 deletions
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5
src/dobject.h
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@ -165,10 +165,11 @@ protected: \
_X_CONSTRUCTOR_##isabstract(cls) \
_IMP_PCLASS(cls, _X_POINTERS_##ptrs(cls), _X_ABSTRACT_##isabstract(cls))
// Taking the address of a field in an object at address 1 instead of
// Taking the address of a field in an object at address > 0 instead of
// address 0 keeps GCC from complaining about possible misuse of offsetof.
// Using 8 to avoid unaligned pointer use.
#define IMPLEMENT_POINTERS_START(cls) const size_t cls::PointerOffsets[] = {
#define IMPLEMENT_POINTER(field) (size_t)&((ThisClass*)1)->field - 1,
#define IMPLEMENT_POINTER(field) ((size_t)&((ThisClass*)8)->field) - 8,
#define IMPLEMENT_POINTERS_END ~(size_t)0 };
// Possible arguments for the IMPLEMENT_CLASS macro