diff options
Diffstat (limited to 'bridges/source/cpp_uno/msvc_win32_arm64/cpp2uno.cxx')
-rw-r--r-- | bridges/source/cpp_uno/msvc_win32_arm64/cpp2uno.cxx | 113 |
1 files changed, 100 insertions, 13 deletions
diff --git a/bridges/source/cpp_uno/msvc_win32_arm64/cpp2uno.cxx b/bridges/source/cpp_uno/msvc_win32_arm64/cpp2uno.cxx index cfefa60e748a..fc956121dc07 100644 --- a/bridges/source/cpp_uno/msvc_win32_arm64/cpp2uno.cxx +++ b/bridges/source/cpp_uno/msvc_win32_arm64/cpp2uno.cxx @@ -24,6 +24,8 @@ #include <cstddef> #include <cstdlib> #include <cstring> +#include <limits> +#include <typeinfo> #include <com/sun/star/uno/XInterface.hpp> #include <com/sun/star/uno/genfunc.hxx> @@ -42,6 +44,8 @@ #include "abi.hxx" +extern "C" IMAGE_DOS_HEADER const __ImageBase; + extern "C" void vtableSlotCall(); using namespace ::com::sun::star; @@ -357,27 +361,110 @@ std::size_t bridges::cpp_uno::shared::VtableFactory::getBlockSize(sal_Int32 slot return (slotCount + 1) * sizeof(Slot) + slotCount * codeSnippetSize; } +static sal_uInt32 imageRelative(void const* p) +{ + assert(reinterpret_cast<sal_uIntPtr>(p) >= reinterpret_cast<sal_uIntPtr>(&__ImageBase) + && reinterpret_cast<sal_uIntPtr>(p) - reinterpret_cast<sal_uIntPtr>(&__ImageBase) + <= std::numeric_limits<sal_uInt32>::max()); + return reinterpret_cast<sal_uIntPtr>(p) - reinterpret_cast<sal_uIntPtr>(&__ImageBase); +} + +namespace +{ +// Some dummy type whose RTTI is used in the synthesized proxy vtables to make uses of dynamic_cast +// on such proxy objects not crash: +struct ProxyRtti +{ +}; + +// The following vtable RTTI data is based on how the code at +// <https://github.com/llvm/llvm-project/blob/main/clang/lib/CodeGen/MicrosoftCXXABI.cpp> computes +// such data, and on how <https://devblogs.microsoft.com/oldnewthing/20041025-00/?p=37483> +// "Accessing the current module’s HINSTANCE from a static library" obtians __ImageBase: + +struct RttiClassHierarchyDescriptor; + +#pragma warning(push) +#pragma warning(disable : 4324) // "structure was padded due to alignment specifier" + +struct alignas(16) RttiBaseClassDescriptor +{ + sal_uInt32 n0 = imageRelative(&typeid(ProxyRtti)); + sal_uInt32 n1 = 0; + sal_uInt32 n2 = 0; + sal_uInt32 n3 = 0xFFFFFFFF; + sal_uInt32 n4 = 0; + sal_uInt32 n5 = 0x40; + sal_uInt32 n6; + RttiBaseClassDescriptor(RttiClassHierarchyDescriptor const* chd) + : n6(imageRelative(chd)) + { + } +}; + +struct alignas(4) RttiBaseClassArray +{ + sal_uInt32 n0; + sal_uInt32 n1 = 0; + RttiBaseClassArray(RttiBaseClassDescriptor const* bcd) + : n0(imageRelative(bcd)) + { + } +}; + +struct alignas(8) RttiClassHierarchyDescriptor +{ + sal_uInt32 n0 = 0; + sal_uInt32 n1 = 0; + sal_uInt32 n2 = 1; + sal_uInt32 n3; + RttiClassHierarchyDescriptor(RttiBaseClassArray const* bca) + : n3(imageRelative(bca)) + { + } +}; + +struct alignas(16) RttiCompleteObjectLocator +{ + sal_uInt32 n0 = 1; + sal_uInt32 n1 = 0; + sal_uInt32 n2 = 0; + sal_uInt32 n3 = imageRelative(&typeid(ProxyRtti)); + sal_uInt32 n4; + sal_uInt32 n5 = imageRelative(this); + RttiCompleteObjectLocator(RttiClassHierarchyDescriptor const* chd) + : n4(imageRelative(chd)) + { + } +}; + +struct Rtti +{ + RttiBaseClassDescriptor bcd; + RttiBaseClassArray bca; + RttiClassHierarchyDescriptor chd; + RttiCompleteObjectLocator col; + Rtti() + : bcd(&chd) + , bca(&bcd) + , chd(&bca) + , col(&chd) + { + } +}; + +#pragma warning(pop) +} + bridges::cpp_uno::shared::VtableFactory::Slot* bridges::cpp_uno::shared::VtableFactory::initializeBlock(void* block, sal_Int32 slotCount, sal_Int32, typelib_InterfaceTypeDescription*) { - struct Rtti - { - sal_Int32 n0, n1, n2; - type_info* rtti; - Rtti() - : n0(0) - , n1(0) - , n2(0) - , rtti(RTTInfos::get("com.sun.star.uno.XInterface")) - { - } - }; static Rtti rtti; Slot* slots = mapBlockToVtable(block); - slots[-1].fn = &rtti; + slots[-1].fn = &rtti.col; return slots + slotCount; } |