Method InitExecution

NULLC/Executor.cpp:665–723

#define RUNTIME_ERROR(test, desc)	if(test){ fcallStack.push_back(cmdStream); cmdStream = NULL; strcpy(execError, desc); break; }

void Executor::InitExecution()
{
	if(!exLinker->exCode.size())
	{
		strcpy(execError, "ERROR: no code to run");
		return;
	}
	fcallStack.clear();
	NULLC_UNWRAP(funcIDStack.clear());

	CommonSetLinker(exLinker);

	genParams.reserve(4096);
	genParams.clear();
	genParams.resize((exLinker->globalVarSize + 0xf) & ~0xf);

	SetUnmanagableRange(genParams.data, genParams.max);

	execError[0] = 0;
	callContinue = true;

	// Add return after the last instruction to end execution of code with no return at the end
	exLinker->exCode.push_back(VMCmd(cmdReturn, bitRetError, 0, 1));

	// General stack
	if(!genStackBase)
	{
		genStackBase = (unsigned int*)NULLC::alloc(sizeof(unsigned int) * 8192 * 2);	// Should be enough, but can grow
		genStackTop = genStackBase + 8192 * 2;
	}
	genStackPtr = genStackTop - 1;

	paramBase = 0;

#if defined(_M_X64)
	// Generate gateway code for all functions
	gateCode.clear();
	for(unsigned int i = 0; i < exFunctions.size(); i++)
	{
		if(!exFunctions[i].funcType)
		{
			exFunctions[i].startInByteCode = 0;
			exFunctions[i].returnShift = 0;
		}else{
			exFunctions[i].startInByteCode = gateCode.size();
			exFunctions[i].returnShift = (unsigned char)CreateFunctionGateway(gateCode, i);
		}
	}
#ifdef _WIN64
	DWORD old;
	VirtualProtect(gateCode.data, gateCode.size(), PAGE_EXECUTE_READWRITE, &old);
#else
	char *p = (char*)((intptr_t)((char*)gateCode.data + PAGESIZE - 1) & ~(PAGESIZE - 1)) - PAGESIZE;
	if(mprotect(p, ((gateCode.size() + PAGESIZE - 1) & ~(PAGESIZE - 1)) + PAGESIZE, PROT_READ | PROT_WRITE | PROT_EXEC))
		asm("int $0x3");
#endif

#endif