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RickandClaude Opus 5.5
f4be0362c8
Every other export of the C++ runtime is declared APS5_VABI, but these two were not. On Windows a title calls them with the System V convention while they read the Microsoft one, so __dynamic_cast took its fourth argument, the src2dst hint, as the source pointer: an ordinary downcast (hint 0) returned null, and the negative hints made it read through an invalid pointer. guest_dynamic_cast calls both through APS5_VABI declarations, as a title does, and checks a single-inheritance downcast, a failed cross cast, a cast of a base object and the header __cxa_init_primary_exception fills in. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
46 lines
2.1 KiB
C++
46 lines
2.1 KiB
C++
#include "prx/libc/include/exceptions/Runtime.hpp"
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#include <cstddef>
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#include <cstdint>
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#include <cstdlib>
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#include <typeinfo>
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struct TypeRecord { const void* vtable; const char* name; const TypeRecord* base; };
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struct Vtable { std::intptr_t offsetToTop; const TypeRecord* type; const void* first; };
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struct Object { const void* vtable; };
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extern "C" {
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extern const unsigned char _ZTVN10__cxxabiv117__class_type_infoE_nid_postfix[];
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extern const unsigned char _ZTVN10__cxxabiv120__si_class_type_infoE_nid_postfix[];
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void* APS5_VABI __dynamic_cast_nid_postfix(const void*, const void*, const void*, std::ptrdiff_t);
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LibcException::Header* APS5_VABI __cxa_init_primary_exception_nid_postfix(void*, std::type_info*, void (*)(void*));
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}
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namespace {
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void Require(bool value) { if (!value) std::abort(); }
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void Destroy(void*) {}
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const TypeRecord BaseType{_ZTVN10__cxxabiv117__class_type_infoE_nid_postfix + 16, "4Base", nullptr};
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const TypeRecord DerivedType{_ZTVN10__cxxabiv120__si_class_type_infoE_nid_postfix + 16, "7Derived", &BaseType};
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const TypeRecord OtherType{_ZTVN10__cxxabiv120__si_class_type_infoE_nid_postfix + 16, "5Other", &BaseType};
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const Vtable BaseVtable{0, &BaseType, nullptr};
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const Vtable DerivedVtable{0, &DerivedType, nullptr};
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} // namespace
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int main() {
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const Object derived{&DerivedVtable.first};
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const Object base{&BaseVtable.first};
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Require(__dynamic_cast_nid_postfix(&derived, &BaseType, &DerivedType, 0) == &derived);
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Require(__dynamic_cast_nid_postfix(&derived, &BaseType, &OtherType, 0) == nullptr);
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Require(__dynamic_cast_nid_postfix(&base, &BaseType, &DerivedType, 0) == nullptr);
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Require(__dynamic_cast_nid_postfix(nullptr, &BaseType, &DerivedType, 0) == nullptr);
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void* object = __cxa_allocate_exception_nid_postfix(16);
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auto* type = reinterpret_cast<std::type_info*>(const_cast<TypeRecord*>(&DerivedType));
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LibcException::Header* header = __cxa_init_primary_exception_nid_postfix(object, type, Destroy);
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Require(header == LibcException::FromObject(object));
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Require(header->type == type && header->destructor == Destroy && header->adjusted == object);
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__cxa_free_exception_nid_postfix(object);
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}
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