fix: segfaults with NULL instances

Author: lmichaelis

src/DaedalusScript.cc

@@ -88,32 +88,32 @@ ZkDaedalusSymbol* ZkDaedalusScript_getSymbolByName(ZkDaedalusScript* slf, ZkStri
 
 ZkString ZkDaedalusSymbol_getString(ZkDaedalusSymbol const* slf, uint16_t index, ZkDaedalusInstance const* context) {
 	ZKC_CHECK_NULL(slf);
-	ZKC_RETURN_CATCH(slf->get_string(index, context->get()).c_str());
+	ZKC_RETURN_CATCH(slf->get_string(index, context ? context->get() : nullptr).c_str());
 }
 
 float ZkDaedalusSymbol_getFloat(ZkDaedalusSymbol const* slf, uint16_t index, ZkDaedalusInstance const* context) {
 	ZKC_CHECK_NULL(slf);
-	ZKC_RETURN_CATCH(slf->get_float(index, context->get()));
+	ZKC_RETURN_CATCH(slf->get_float(index, context ? context->get() : nullptr));
 }
 
 int32_t ZkDaedalusSymbol_getInt(ZkDaedalusSymbol const* slf, uint16_t index, ZkDaedalusInstance const* context) {
 	ZKC_CHECK_NULL(slf);
-	ZKC_RETURN_CATCH(slf->get_int(index, context->get()));
+	ZKC_RETURN_CATCH(slf->get_int(index, context ? context->get() : nullptr));
 }
 
 void ZkDaedalusSymbol_setString(ZkDaedalusSymbol* slf, ZkString value, uint16_t index, ZkDaedalusInstance* context) {
 	ZKC_CHECK_NULLV(slf, value);
-	ZKC_CATCH(slf->set_string(value, index, context->get()));
+	ZKC_CATCH(slf->set_string(value, index, context ? context->get() : nullptr));
 }
 
 void ZkDaedalusSymbol_setFloat(ZkDaedalusSymbol* slf, float value, uint16_t index, ZkDaedalusInstance* context) {
 	ZKC_CHECK_NULLV(slf);
-	ZKC_CATCH(slf->set_float(value, index, context->get()));
+	ZKC_CATCH(slf->set_float(value, index, context ? context->get() : nullptr));
 }
 
 void ZkDaedalusSymbol_setInt(ZkDaedalusSymbol* slf, int32_t value, uint16_t index, ZkDaedalusInstance* context) {
 	ZKC_CHECK_NULLV(slf);
-	ZKC_CATCH(slf->set_int(value, index, context->get()));
+	ZKC_CATCH(slf->set_int(value, index, context ? context->get() : nullptr));
 }
 
 ZkBool ZkDaedalusSymbol_getIsConst(ZkDaedalusSymbol const* slf) {

src/DaedalusVm.cc

@@ -156,71 +156,91 @@ ZkDaedalusInstance* ZkDaedalusVm_popInstance(ZkDaedalusVm* slf) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULL(slf);
 
-	auto* instance = new ZkDaedalusInstance(slf->handle.pop_instance());
-	ZKC_RETURN_CATCH(instance);
+	auto instance = slf->handle.pop_instance();
+	if (instance == nullptr) {
+		return nullptr;
+	}
+
+	ZKC_RETURN_CATCH(new ZkDaedalusInstance(instance));
 }
 
 ZkDaedalusInstance* ZkDaedalusVm_getGlobalSelf(ZkDaedalusVm* slf) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULL(slf);
 
 	auto& instance = slf->handle.global_self()->get_instance();
+	if (instance == nullptr) {
+		return nullptr;
+	}
 	ZKC_RETURN_CATCH(new ZkDaedalusInstance(instance));
 }
 
 ZkDaedalusInstance* ZkDaedalusVm_getGlobalOther(ZkDaedalusVm* slf) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULL(slf);
 	auto& instance = slf->handle.global_other()->get_instance();
+	if (instance == nullptr) {
+		return nullptr;
+	}
 	ZKC_RETURN_CATCH(new ZkDaedalusInstance(instance));
 }
 
 ZkDaedalusInstance* ZkDaedalusVm_getGlobalVictim(ZkDaedalusVm* slf) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULL(slf);
 	auto& instance = slf->handle.global_victim()->get_instance();
+	if (instance == nullptr) {
+		return nullptr;
+	}
 	ZKC_RETURN_CATCH(new ZkDaedalusInstance(instance));
 }
 
 ZkDaedalusInstance* ZkDaedalusVm_getGlobalHero(ZkDaedalusVm* slf) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULL(slf);
 	auto& instance = slf->handle.global_hero()->get_instance();
+	if (instance == nullptr) {
+		return nullptr;
+	}
 	ZKC_RETURN_CATCH(new ZkDaedalusInstance(instance));
 }
 
 ZkDaedalusInstance* ZkDaedalusVm_getGlobalItem(ZkDaedalusVm* slf) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULL(slf);
 	auto& instance = slf->handle.global_item()->get_instance();
+	if (instance == nullptr) {
+		return nullptr;
+	}
+
 	ZKC_RETURN_CATCH(new ZkDaedalusInstance(instance));
 }
 
 void ZkDaedalusVm_setGlobalSelf(ZkDaedalusVm* slf, ZkDaedalusInstance* value) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULLV(slf);
 
-	ZKC_CATCH(slf->handle.global_self()->set_instance(*value));
+	ZKC_CATCH(slf->handle.global_self()->set_instance(value ? *value : nullptr));
 }
 void ZkDaedalusVm_setGlobalOther(ZkDaedalusVm* slf, ZkDaedalusInstance* value) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULLV(slf);
-	ZKC_CATCH(slf->handle.global_other()->set_instance(*value));
+	ZKC_CATCH(slf->handle.global_other()->set_instance(value ? *value : nullptr));
 }
 void ZkDaedalusVm_setGlobalVictim(ZkDaedalusVm* slf, ZkDaedalusInstance* value) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULLV(slf);
-	ZKC_CATCH(slf->handle.global_victim()->set_instance(*value));
+	ZKC_CATCH(slf->handle.global_victim()->set_instance(value ? *value : nullptr));
 }
 void ZkDaedalusVm_setGlobalHero(ZkDaedalusVm* slf, ZkDaedalusInstance* value) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULLV(slf);
-	ZKC_CATCH(slf->handle.global_hero()->set_instance(*value));
+	ZKC_CATCH(slf->handle.global_hero()->set_instance(value ? *value : nullptr));
 }
 void ZkDaedalusVm_setGlobalItem(ZkDaedalusVm* slf, ZkDaedalusInstance* value) {
 	ZKC_TRACE_FN();
 	ZKC_CHECK_NULLV(slf);
-	ZKC_CATCH(slf->handle.global_item()->set_instance(*value));
+	ZKC_CATCH(slf->handle.global_item()->set_instance(value ? *value : nullptr));
 }
 
 void ZkDaedalusVm_callFunction(ZkDaedalusVm* slf, ZkDaedalusSymbol* sym) {