gecko-dev/gc/boehm/typeinfo.cpp

56 строки
1.3 KiB
C++
Исходник Обычный вид История

1999-09-30 06:25:54 +04:00
/*
typeinfo.cpp
Speculatively use RTTI on a random object. If it contains a pointer at offset 0
that is in the current process' address space, and that so on, then attempt to
use C++ RTTI's typeid operation to obtain the name of the type.
by Patrick C. Beard.
*/
#include <typeinfo>
#include <Processes.h>
extern "C" const char* getTypeName(void* ptr);
class AddressSpace {
public:
AddressSpace();
Boolean contains(void* ptr);
private:
ProcessInfoRec mInfo;
};
AddressSpace::AddressSpace()
{
ProcessSerialNumber psn = { 0, kCurrentProcess };
mInfo.processInfoLength = sizeof(mInfo);
::GetProcessInformation(&psn, &mInfo);
}
Boolean AddressSpace::contains(void* ptr)
{
UInt32 start = UInt32(mInfo.processLocation);
return (UInt32(ptr) >= start && UInt32(ptr) < (start + mInfo.processSize));
}
class IUnknown {
virtual long QueryInterface() = 0;
virtual long AddRef() = 0;
virtual long Release() = 0;
};
const char* getTypeName(void* ptr)
{
// construct only one of these per process.
static AddressSpace space;
// sanity check the vtable pointer, before trying to use RTTI on the object.
void** vt = *(void***)ptr;
if (space.contains(vt) && space.contains(*vt)) {
IUnknown* u = static_cast<IUnknown*>(ptr);
return typeid(*u).name();
}
return "void*";
}