List dynamic initializers with MSVC CRT

dynamic_initializers.cpp

// Dynamic initializer names
// Based on https://x.com/molecularmusing/status/2079654839005393235

#include <DbgHelp.h>
#pragma comment(lib, "dbghelp.lib")

PRAGMA_OPTIMIZE_OFF
typedef void(__cdecl* _PVFV)(void);
extern "C" _PVFV __xc_a[];
extern "C" _PVFV __xc_z[];

struct InspectGlobalInitializers
{
	InspectGlobalInitializers()
	{
		SymInitialize(GetCurrentProcess(), NULL, TRUE);
		SymSetOptions(SYMOPT_UNDNAME | SYMOPT_DEFERRED_LOADS | SYMOPT_LOAD_LINES);

		const _PVFV* begin = __xc_a;
		const _PVFV* end = __xc_z;

		int cnt = 0;
		for (const _PVFV* ptr = begin; ptr < end; ++ptr)
		{
			const _PVFV initializer = *ptr;
			if (initializer)
				++cnt;
		}
		names.reserve(cnt);

		for (const _PVFV* ptr = begin; ptr < end; ++ptr)
		{
			const _PVFV initializer = *ptr;
			if (initializer)
				ResolveName((DWORD64)initializer);
		}
	}

	void ResolveName(DWORD64 addr)
	{
		char buffer[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(char)];
		PSYMBOL_INFO pSymbol = (PSYMBOL_INFO)buffer;
		pSymbol->SizeOfStruct = sizeof(SYMBOL_INFO);
		pSymbol->MaxNameLen = MAX_SYM_NAME;

		DWORD64 displacement = 0;
		if (SymFromAddr(GetCurrentProcess(), addr, &displacement, pSymbol))
			names.append(EqString::Format("%s", &pSymbol->Name));
		else
			names.append(EqString::Format("0x%llX: <no symbol>", addr));
	}

	Array<EqString> names{ PPSourceLine::Empty() };
};

#pragma warning(push)
#pragma warning(disable: 4074)

#pragma init_seg(compiler)
static InspectGlobalInitializers globalsInspector;

#pragma warning(pop)
PRAGMA_OPTIMIZE_ON