diff --git a/GC.c b/GC.c
index b6a65fa..de25be0 100644
--- a/GC.c
+++ b/GC.c
@@ -12,9 +12,12 @@
 typedef struct {
     unsigned int freiZeiger;
     unsigned int size;
-    ObjRef *data;
+    unsigned char *data;
 } *heapPartRef;
 
+// SDA
+struct sda sda;
+
 // Stack
 struct stack stack;
 #define SIZE 64
@@ -38,15 +41,58 @@ void copy(ObjRef obj){
     if(obj->brokenHeart == true) return;
     obj->brokenHeart = true;
     if (IS_PRIMITIVE(obj)){
-        obj->forward_pointer = memcpy(secondary->data[secondary->freiZeiger],obj,obj->size);
+        if(obj->size > secondary->size-secondary->freiZeiger) perror("Heap is to Small");
+        obj->forward_pointer = memcpy((void *) secondary->data[secondary->freiZeiger], obj, obj->size);
         secondary->freiZeiger += obj->size;
     } else {
+        if(sizeof(*obj) + (GET_ELEMENT_COUNT(obj) * sizeof(void *)) > secondary->size-secondary->freiZeiger) perror("Heap is to Small");
         GET_ELEMENT_COUNT(obj);
-        obj->forward_pointer = memcpy(secondary->data[secondary->freiZeiger],obj,sizeof(*obj) + (GET_ELEMENT_COUNT(obj) * sizeof(void *)));
+        obj->forward_pointer = memcpy((void *) secondary->data[secondary->freiZeiger], obj, sizeof(*obj) + (GET_ELEMENT_COUNT(obj) * sizeof(void *)));
         secondary->freiZeiger += sizeof(*obj) + (GET_ELEMENT_COUNT(obj) * sizeof(void *));
         for (int i = 0; i < GET_ELEMENT_COUNT(obj); ++i) {
             copy(getField(obj,i));
         }
     }
 }
+
+void runGC(){
+    int rootSize = *sda.size + *reg.size + *stack.size + 4;
+    ObjRef* rootObjs = malloc(sizeof(ObjRef) * rootSize);
+    if(rootObjs == NULL) perror("malloc");
+    int counter = 0;
+    //Bip
+    rootObjs[0] = bip.op1;
+    rootObjs[counter++] = bip.op2;
+    rootObjs[counter++] = bip.res;
+    rootObjs[counter++] = bip.rem;
+    //SDA
+    for (int i = 0; i < *sda.size; ++i) {
+        rootObjs[counter++] = sda.sda[i];
+    }
+    //REG
+    for (int i = 0; i < *reg.size; ++i) {
+        rootObjs[counter++] = reg.stack[i].u.objRef;
+    }
+    //STACK
+    for (int i = 0; i < *stack.size; ++i) {
+        rootObjs[counter++] = stack.stack[i].u.objRef;
+    }
+
+    for (int i = 0; i < rootSize; ++i) {
+        if(rootObjs[i] == NULL) continue;
+        copy(rootObjs[i]);
+    }
+    heapPartRef temp = primary;
+    primary = secondary;
+    secondary = temp;
+
+}
+
+void *alloc(size_t size){
+    if(primary->size-primary->freiZeiger < size){
+        runGC();
+    }
+    primary->freiZeiger += size;
+    return (void *) primary->data[primary->freiZeiger - size];
+}
 #endif
diff --git a/bigint/build/bin/testbip b/bigint/build/bin/testbip
index 84ced15..b026b0c 100755
Binary files a/bigint/build/bin/testbip and b/bigint/build/bin/testbip differ
diff --git a/bigint/build/lib/libbigint.a b/bigint/build/lib/libbigint.a
index 3d8c43a..84a5d14 100644
Binary files a/bigint/build/lib/libbigint.a and b/bigint/build/lib/libbigint.a differ
diff --git a/bigint/src/libbigint.a b/bigint/src/libbigint.a
index 3d8c43a..84a5d14 100644
Binary files a/bigint/src/libbigint.a and b/bigint/src/libbigint.a differ
diff --git a/bigint/tst/testbip b/bigint/tst/testbip
index 84ced15..b026b0c 100755
Binary files a/bigint/tst/testbip and b/bigint/tst/testbip differ
diff --git a/njvm.c b/njvm.c
index 4d19931..f16e77a 100644
--- a/njvm.c
+++ b/njvm.c
@@ -5,7 +5,6 @@
 #include "stack.c"
 #include "program.c"
 #include "codeReader.c"
-#include "SDA.c"
 #include "debugMenu.c"
 #include "bigint.h"
 #include "record.c"
@@ -311,7 +310,7 @@ int main(int argc, char *argv[]) {
     int current = 0;
     stack.size = &size;
     stack.current = &current;
-    stack.stack = malloc(SIZE * 10024);
+    stack.stack = malloc(SIZE * 1024);
 
     // Initialize the registery
     int rSize = 1000;
diff --git a/njvm.o b/njvm.o
index b389ffd..d5a90df 100644
Binary files a/njvm.o and b/njvm.o differ
diff --git a/record.c b/record.c
index a9c6eb1..3428583 100644
--- a/record.c
+++ b/record.c
@@ -32,7 +32,7 @@ void setField(ObjRef arr, int point, ObjRef value){
     if(0 > point || point > getSize(arr)){
         printf("Index %i out of bounds for length %i\n",point, getSize(arr));
     }
-    GET_REFS_PTR(arr)[point] = malloc(8);
+    GET_REFS_PTR(arr)[point] = malloc(20);
     * (ObjRef *)GET_REFS_PTR(arr)[point]->data = value;
 }
 
diff --git a/stack.c b/stack.c
index 0b2ae46..2079fbe 100755
--- a/stack.c
+++ b/stack.c
@@ -9,8 +9,7 @@
 #include "stackslot.c"
 #include "sda.c"
 
-// SDA
-struct sda sda;
+
 
 struct stack {
     int* size;
diff --git a/stackslot.c b/stackslot.c
index 875f81d..24d2140 100644
--- a/stackslot.c
+++ b/stackslot.c
@@ -22,7 +22,7 @@ typedef struct {
 
 ObjRef getIntObj(int val) {
     ObjRef intObject;
-    unsigned int objSize = sizeof(unsigned int) + sizeof(int);
+    unsigned int objSize = sizeof(ObjRef) + sizeof(int);
     if ((intObject = malloc(objSize)) == NULL) {
         perror("malloc");
     }