diff --git a/src/GC/Makefile b/src/GC/Makefile
index e92237f..4aac430 100644
--- a/src/GC/Makefile
+++ b/src/GC/Makefile
@@ -69,6 +69,7 @@ static_lib:
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -c -o lib/event.o lib/event.cpp -fPIC
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -c -o lib/profiler.o lib/profiler.cpp -fPIC
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -c -o lib/heap.o lib/heap.cpp -fPIC
+<<<<<<< HEAD
 # create static library
 	ar r lib/gcoll.a lib/event.o lib/profiler.o lib/heap.o
 
@@ -92,6 +93,8 @@ wrapper:
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -O3 -g -c -o lib/heap.o lib/heap.cpp -fPIC
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -O3 -g -c -o lib/cheap.o lib/cheap.cpp -fPIC
 <<<<<<< HEAD
+=======
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 # create static library
 	ar r lib/gcoll.a lib/event.o lib/profiler.o lib/heap.o
 =======
@@ -100,19 +103,35 @@ wrapper:
 alloc_free_list: static_lib
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -o tests/alloc_fl.out tests/alloc_free_list.cpp lib/gcoll.a
 
+<<<<<<< HEAD
 linked_list_test: static_lib
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -o tests/linkedlist.out tests/linkedlist.cpp lib/gcoll.a
 
 <<<<<<< HEAD
 >>>>>>> d7ea27e (testing testing...)
 =======
+=======
+# create test program
+static_lib_test: static_lib
+	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -o tests/extern_lib.out tests/extern_lib.cpp lib/gcoll.a
+
+alloc_free_list: static_lib
+	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -o tests/alloc_fl.out tests/alloc_free_list.cpp lib/gcoll.a
+
+linked_list_test: static_lib
+	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -o tests/linkedlist.out tests/linkedlist.cpp lib/gcoll.a
+
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 revrange: static_lib
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -o tests/revrange.out tests/revrange.cpp lib/gcoll.a
 
 pointers: static_lib
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -o tests/pointers.out tests/pointers.cpp lib/gcoll.a
 
+<<<<<<< HEAD
 >>>>>>> a910d54 (rip gc)
+=======
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 wrapper:
 # remove old files 
 	rm -f lib/event.o lib/profiler.o lib/heap.o lib/coll.a tests/wrapper.out
@@ -122,8 +141,14 @@ wrapper:
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -O3 -c -o lib/heap.o lib/heap.cpp -fPIC
 	$(CC) $(STDFLAGS) $(WFLAGS) $(LIB_INCL) -O3 -c -o lib/cheap.o lib/cheap.cpp -fPIC
 # compile object files into library
+<<<<<<< HEAD
 >>>>>>> 01c93a6 (Wrapper docs)
 	ar rcs lib/gcoll.a lib/event.o lib/profiler.o lib/heap.o lib/cheap.o
 # compile test program wrapper.c with normal clang
 	clang -stdlib=libc++ $(WFLAGS) $(LIB_INCL) -o tests/wrapper.out tests/wrapper.c lib/gcoll.a -lstdc++
 >>>>>>> 12816ea (Wrapper works)
+=======
+	ar rcs lib/gcoll.a lib/event.o lib/profiler.o lib/heap.o lib/cheap.o
+# compile test program wrapper.c with normal clang
+	clang -stdlib=libc++ $(WFLAGS) $(LIB_INCL) -o tests/wrapper.out tests/wrapper.c lib/gcoll.a -lstdc++
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
diff --git a/src/GC/include/cheap.h b/src/GC/include/cheap.h
index 7bfab4e..9affefc 100644
--- a/src/GC/include/cheap.h
+++ b/src/GC/include/cheap.h
@@ -7,11 +7,16 @@
 extern "C" {
 #endif
 
+<<<<<<< HEAD
 <<<<<<< HEAD
 #define WRAPPER_DEBUG
 =======
 #define DEBUG
 >>>>>>> 74e0282 (Added Hash map marking)
+=======
+#define DEBUG
+#define WRAPPER_DEBUG
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 
 #ifdef WRAPPER_DEBUG
 typedef struct cheap
diff --git a/src/GC/include/heap.hpp b/src/GC/include/heap.hpp
index 6052966..9b8a100 100644
--- a/src/GC/include/heap.hpp
+++ b/src/GC/include/heap.hpp
@@ -12,6 +12,7 @@
 <<<<<<< HEAD
 <<<<<<< HEAD
 <<<<<<< HEAD
+<<<<<<< HEAD
 #define HEAP_SIZE 320//65536
 #define FREE_THRESH (uint) 0
 =======
@@ -28,6 +29,11 @@
 #define FREE_THRESH (uint) 100000 //1000
 #define DEBUG
 >>>>>>> 74e0282 (Added Hash map marking)
+=======
+#define HEAP_SIZE 160000//65536
+#define FREE_THRESH (uint) 5
+// #define HEAP_DEBUG
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 
 namespace GC
 {
@@ -81,11 +87,16 @@ namespace GC
 
 		std::vector<Chunk *> m_allocated_chunks;
 		std::vector<Chunk *> m_freed_chunks;
+<<<<<<< HEAD
 <<<<<<< HEAD
 		std::list<Chunk *> m_free_list;
 =======
 		std::unordered_map<uintptr_t, Chunk*> m_chunk_table;
 >>>>>>> 74e0282 (Added Hash map marking)
+=======
+		std::list<Chunk *> m_free_list;
+		std::unordered_map<uintptr_t, Chunk*> m_chunk_table;
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 
 		static bool profiler_enabled();
 		// static Chunk *get_at(std::vector<Chunk *> &list, size_t n);
diff --git a/src/GC/lib/heap.cpp b/src/GC/lib/heap.cpp
index cc393b1..f44f1f3 100644
--- a/src/GC/lib/heap.cpp
+++ b/src/GC/lib/heap.cpp
@@ -3,6 +3,10 @@
 #include <stdlib.h>
 #include <vector>
 <<<<<<< HEAD
+<<<<<<< HEAD
+=======
+#include <unordered_map>
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 #include <chrono>
 #include <queue>
 #include <set>
@@ -12,6 +16,7 @@
 #define time_now	std::chrono::high_resolution_clock::now()
 #define to_us		std::chrono::duration_cast<std::chrono::microseconds>
 
+<<<<<<< HEAD
 using std::cout, std::endl, std::vector, std::hex, std::dec;
 =======
 #include <unordered_map>
@@ -20,6 +25,9 @@ using std::cout, std::endl, std::vector, std::hex, std::dec;
 
 using std::cout, std::endl, std::vector, std::hex, std::dec, std::unordered_map;
 >>>>>>> 74e0282 (Added Hash map marking)
+=======
+using std::cout, std::endl, std::vector, std::hex, std::dec, std::unordered_map;
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 
 namespace GC
 {
@@ -104,6 +112,7 @@ namespace GC
 			heap.collect(stack_bottom);
 			// If memory is not enough after collect, crash with OOM error
 <<<<<<< HEAD
+<<<<<<< HEAD
 <<<<<<< HEAD
 			if (heap.m_size + size > HEAP_SIZE)
 			{
@@ -114,14 +123,19 @@ namespace GC
 =======
 =======
 >>>>>>> 208ff86 (Fixed bug in size handling and mark hash)
+=======
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 			if (heap.m_size > HEAP_SIZE)
 			{
 				throw std::runtime_error(std::string("Error: Heap out of memory"));
 			}
 			//throw std::runtime_error(std::string("Error: Heap out of memory"));
 <<<<<<< HEAD
+<<<<<<< HEAD
 >>>>>>> 74e0282 (Added Hash map marking)
 =======
+=======
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 		}
 		if (heap.m_size + size > HEAP_SIZE)
 		{
@@ -256,6 +270,7 @@ namespace GC
 		// create_table();
 		// mark_hash(stack_bottom, stack_top);
 
+<<<<<<< HEAD
 		vector<uintptr_t *> roots;
 		// cout << "\nb4 find_roots\n";
 		find_roots(stack_bottom, roots);
@@ -263,6 +278,16 @@ namespace GC
 		// cout << "b4 mark\n";''
 		mark(roots);
 
+=======
+		create_table();
+		vector<uintptr_t *> roots;
+		// cout << "\nb4 find_roots\n";
+		find_roots(stack_bottom, roots);
+
+		// cout << "b4 mark\n";''
+		mark(roots);
+
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 		// cout << "b4 sweep\n";
 		sweep(heap);
 
@@ -320,6 +345,7 @@ namespace GC
 	}
 
 	void Heap::find_chunks(uintptr_t *stack_addr, std::queue<std::pair<uintptr_t, uintptr_t>> &chunk_spaces)
+<<<<<<< HEAD
 	{
 		auto iter = m_allocated_chunks.begin();
 		auto end = m_allocated_chunks.end();
@@ -346,12 +372,70 @@ namespace GC
 <<<<<<< HEAD
 <<<<<<< HEAD
 	void Heap::mark_range(vector<AddrRange *> &ranges, vector<Chunk *> &worklist)
+=======
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 	{
 		Heap &heap = Heap::the();
+
+		auto it = heap.m_chunk_table.find(*stack_addr);
+		if (it != heap.m_chunk_table.end())
+		{
+			auto chunk = it->second;
+
+			if (!chunk->m_marked) 
+			{
+				auto c_start = reinterpret_cast<uintptr_t>(chunk->m_start);
+				auto c_size  = reinterpret_cast<uintptr_t>(chunk->m_size);
+				auto c_end   = reinterpret_cast<uintptr_t>(c_start + c_size);
+
+				chunk->m_marked = true;
+				chunk_spaces.push(std::make_pair(c_start, c_end));
+			}
+			
+		}
+
+/* 		auto iter = m_allocated_chunks.begin();
+		auto end = m_allocated_chunks.end();
+
+		while (iter != end)
+		{
+			auto chunk = *iter++;
+			
+			if (chunk->m_marked)
+				continue;
+
+			auto c_start = reinterpret_cast<uintptr_t>(chunk->m_start);
+			auto c_size  = reinterpret_cast<uintptr_t>(chunk->m_size);
+			auto c_end   = reinterpret_cast<uintptr_t>(c_start + c_size);
+
+			if (c_start < *stack_addr && *stack_addr < c_end)
+			{
+				chunk->m_marked = true;
+				chunk_spaces.push(std::make_pair(c_start, c_end));
+			}
+		} */
+
+	}
+
+	void Heap::create_table() 
+	{
+		Heap &heap = Heap::the();
+		unordered_map<uintptr_t, Chunk*> chunk_table;
+		for (auto chunk : heap.m_allocated_chunks) {
+			auto pair = std::make_pair(reinterpret_cast<uintptr_t>(chunk->m_start), chunk);
+			heap.m_chunk_table.insert(pair);		
+		}
+	}
+
+	void Heap::mark_hash(uintptr_t *start, const uintptr_t* const end) 
+	{
+		Heap &heap = Heap::the();
+
 		bool profiler_enabled = heap.m_profiler_enable;
 		if (profiler_enabled)
 			Profiler::record(MarkStart);
 
+<<<<<<< HEAD
 		auto iter = ranges.begin();
 		auto stop = ranges.end();
 
@@ -419,6 +503,41 @@ namespace GC
 					chunk->m_marked = true;
 					mark_hash(chunk->m_start, c_end);
 >>>>>>> 74e0282 (Added Hash map marking)
+=======
+		for (; start <= end; start++) 
+		{
+			auto search = heap.m_chunk_table.find(*start);
+			if (search != heap.m_chunk_table.end())
+			{
+				Chunk *chunk = search->second;
+				auto c_start = reinterpret_cast<uintptr_t>(chunk->m_start);
+				auto c_size = reinterpret_cast<uintptr_t>(chunk->m_size);
+				auto c_end = reinterpret_cast<uintptr_t*>(c_start + c_size);
+				if (!chunk->m_marked) 
+				{
+					chunk->m_marked = true;
+
+					if (profiler_enabled)
+						Profiler::record(ChunkMarked, chunk);
+
+					//mark_hash(chunk->m_start, c_end);
+					Chunk *next = find_pointer_hash((uintptr_t *) c_start, (uintptr_t *) c_end);
+					while (next != NULL) 
+					{
+						if (!next->m_marked) 
+						{
+							next->m_marked = true;
+
+							if (profiler_enabled)
+								Profiler::record(ChunkMarked, chunk);
+
+							auto c_start = reinterpret_cast<uintptr_t>(next->m_start);
+							auto c_size  = reinterpret_cast<uintptr_t>(next->m_size);
+							auto c_end   = reinterpret_cast<uintptr_t>(c_start + c_size);
+							next = find_pointer_hash((uintptr_t *) c_start, (uintptr_t *) c_end);
+						}
+					}
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 				}
 			}
 		}
@@ -440,6 +559,7 @@ namespace GC
 		}
 	}
 
+<<<<<<< HEAD
 	void Heap::mark_hash(uintptr_t *start, const uintptr_t* const end) 
 	{
 		Heap &heap = Heap::the();
@@ -486,6 +606,8 @@ namespace GC
 		}
 	}
 
+=======
+>>>>>>> 7e93aab6268ac896dea03dcd045b8bc249f2576c
 	/**
 	 * Sweeps the heap, unmarks the marked chunks for the next cycle,
 	 * adds the unmarked nodes to the list of freed chunks; to be freed.