diff --git a/.gitignore b/.gitignore
index 76f7136..e586fc2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,4 +15,6 @@ lib*.a
 
 embedder
 
-*_n.c
\ No newline at end of file
+*_n.c
+
+profiling-results.txt
\ No newline at end of file
diff --git a/README.md b/README.md
index bf8a103..c99f9a8 100644
--- a/README.md
+++ b/README.md
@@ -67,10 +67,10 @@ The `noja` executable will be generated, which is a CLI that runs Noja code.
 ## Usage
 You can run files by doing:
 ```sh
-location/of/noja run <filename>
+location/of/noja <filename>
 ```
 
 or you can run strings by doing:
 ```sh
-location/of/noja run inline <string>
+location/of/noja -i <string>
 ```
diff --git a/examples/http_server/router.noja b/examples/http_server/router.noja
index 65f93ae..a73dbe8 100644
--- a/examples/http_server/router.noja
+++ b/examples/http_server/router.noja
@@ -5,6 +5,8 @@ Router = {table: Map, plug: Callable, solve: Callable};
 
 fun loadFile(path: String) {
 
+	print("path=", path, "\n");
+
 	stream, error = files.openFile(path, files.READ);
 	if error != none:
 		return none, error;
@@ -83,8 +85,8 @@ fun new() {
 			if isCallable(method_item):
 				res = method_item(req);
 			else {
-				cwd  = getCurrentWorkingDirectory();
-				file = path.join(cwd, method_item);
+				csd  = getCurrentScriptDirectory();
+				file = path.join(csd, method_item);
 				data, error = loadFile(file);
 				if error == none: 
 					res = respond(200, data);
diff --git a/examples/json.noja b/examples/json.noja
index e52288f..d7936b5 100644
--- a/examples/json.noja
+++ b/examples/json.noja
@@ -251,6 +251,43 @@ fun parse(src: String) {
     return val, err;
 }
 
+fun readFile(name: String) {
+    stream, error = files.openFile(name, files.READ);
+    if error != none:
+        return error;
+
+    text = "";
+    size = 256;
+    do {
+        
+        size = size * 2;
+        buff = buffer.new(size);
+
+        read_bytes, error = files.read(stream, buff);
+        if error != none:
+            return error;
+
+        text2, error = buffer.toString(buff);
+        if error != none:
+            return none, error;
+        assert(text2 != none);
+        
+        text = string.cat(text, text2);
+
+    } while count(buff) == read_bytes;
+
+    return text;
+}
+
+fun parseFile(name: String) {
+    text, error = readFile(name);
+    if error != none:
+        return none, error;
+    assert(text != none);
+    result, error = parse(text);
+    return result, error;
+}
+
 fun test() {
 
     compareAny = import("compare.noja").compareAny;
@@ -330,4 +367,4 @@ fun test() {
     print(" total: ", total,  "\n");
 }
 
-return {parse: parse, test: test};
\ No newline at end of file
+return {parse: parse, parseFile: parseFile, test: test};
\ No newline at end of file
diff --git a/examples/scan.noja b/examples/scan.noja
index 96d594c..8e87db4 100644
--- a/examples/scan.noja
+++ b/examples/scan.noja
@@ -8,13 +8,13 @@ Scanner = {
     consumeSpaces: Callable
 };
 
+fun isSpace(c: String)
+    return c == ' '
+        or c == '\t'
+        or c == '\n';
+
 fun newScanner(src: String) {
     
-    fun isSpace(c: String)
-        return c == ' '
-            or c == '\t'
-            or c == '\n';
-    
     scan = {
         src: src, 
         i: 0,
diff --git a/src/cli/main.c b/src/cli/main.c
index c58d9ab..4cf18d9 100644
--- a/src/cli/main.c
+++ b/src/cli/main.c
@@ -27,114 +27,170 @@
 ** | with The Noja Interpreter. If not, see <http://www.gnu.org/licenses/>.   |
 ** +--------------------------------------------------------------------------+ 
 */
-
+#include <stdio.h>
 #include <assert.h>
 #include <string.h>
 #include <stdlib.h>
-#include <stdio.h>
+#include <stdbool.h>
 #include "../lib/noja.h"
 
-static const char usage[] = 
-	"Usage patterns:\n"
-	"    $ noja run file.noja\n"
-	"    $ noja run inline \"print('some noja code');\"\n"
-	"    $ noja dis file.noja\n"
-	"    $ noja dis inline \"print('some noja code');\"\n"
-	"    $ noja asm file.noja\n"
-	"    $ noja asm inline \"PUSHINT 5; PUSHFLT 1.0; ADD; POP 1;\"\n";
+static void usage(FILE *stream, const char *name) 
+{
+	fprintf(stream, 
+		"USAGE\n"
+		"  $ %s [-h | -o <file> | -p | -H <heap size> | {-d | -a}] [--] <file>\n", name);
+}
+
+static void help(FILE *stream, const char *name)
+{
+	usage(stream, name);
+	fprintf(stream, 
+		"OPTIONS\n"
+		"  -h, --help        Show this message\n"
+		"  -d, --disassembly Output the bytecode associated to noja code\n"
+		"  -i, --inline      Execute a string of code instead of a file\n"
+		"  -a, --assembly    Specify that the source is bytecode and not noja code\n"
+		"  -p, --profile     Profile the execution of the source (can't be used with -d)\n"
+		"  -o, --output      Specify the output file of -p or -d\n"
+		"  -H, --heap <size> Heap size\n"
+		"\n");
+}
+
+typedef enum {
+	Mode_DISASSEMBLy,
+	Mode_ASSEMBLY,
+	Mode_DEFAULT,
+	Mode_HELP,
+} Mode;
 
 int main(int argc, char **argv)
 {
-	assert(argc > 0);
+	Mode mode = Mode_DEFAULT;
+	bool profile = false;
+	bool no_file = false;
+	const char *output = NULL;
+	const char *input  = NULL;
+	size_t heap = 1024 * 1024;
+
+	for (int i = 1; i < argc; i++) {
+
+		if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 	
-	if(argc == 1)
-	{
-		// $ noja
-		fprintf(stderr, "Error: Incorrect usage.\n\n");
-		fprintf(stderr, usage);
-		return -1;
-	}
+			mode = Mode_HELP;
+		
+		} else if (!strcmp(argv[i], "-d") || !strcmp(argv[i], "--disassembly")) {
 
-	if(!strcmp(argv[1], "run"))
-	{
-		if(argc == 2)
-		{
-			fprintf(stderr, "Error: Missing source file.\n");
-			return -1;
-		}
+			mode = Mode_DISASSEMBLy;
 
-		_Bool r;
+		} else if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--inline")) {
+			
+			no_file = true;
 
-		if(!strcmp(argv[2], "inline"))
-		{
-			if(argc == 3)
-			{
-				fprintf(stderr, "Error: Missing source string.\n");
+		} else if (!strcmp(argv[i], "-a") || !strcmp(argv[i], "--assembly")) {
+
+			mode = Mode_ASSEMBLY;
+
+		} else if (!strcmp(argv[i], "-p") || !strcmp(argv[i], "--profile")) {
+
+			profile = true;
+
+		} else if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--output")) {
+
+			if (i+1 == argc || argv[i+1][0] == '-') {
+				fprintf(stderr, "Missing file path after %s option\n", argv[i]);
+				usage(stderr, argv[0]);
 				return -1;
 			}
-			r = NOJA_runString(argv[3]);
-		}
-		else
-			r = NOJA_runFile(argv[2]);
-		return r ? 0 : -1;
-	}
+			output = argv[++i];
 
-	if(!strcmp(argv[1], "asm"))
-	{
-		if(argc == 2)
-		{
-			fprintf(stderr, "Error: Missing source file.\n");
-			return -1;
-		}
+		} else if (!strcmp(argv[i], "-H") || !strcmp(argv[i], "--heap")) {
 
-		_Bool r;
-
-		if(!strcmp(argv[2], "inline"))
-		{
-			if(argc == 3)
-			{
-				fprintf(stderr, "Error: Missing source string.\n");
+			if (i+1 == argc || argv[i+1][0] == '-') {
+				fprintf(stderr, "Missing byte count after %s option\n", argv[i]);
+				usage(stderr, argv[0]);
 				return -1;
 			}
-			r = NOJA_runAssemblyString(argv[3]);
-		}
-		else
-			r = NOJA_runAssemblyFile(argv[2]);
-		return r ? 0 : -1;
-	}
-	
-	if(!strcmp(argv[1], "dis"))
-	{
-		if(argc == 2)
-		{
-			fprintf(stderr, "Error: Missing source file.\n");
-			return -1;
-		}
-
-		_Bool r;
-
-		if(!strcmp(argv[2], "inline"))
-		{
-			if(argc == 3)
-			{
-				fprintf(stderr, "Error: Missing source string.\n");
+			heap = atoi(argv[++i]);
+			if (heap == 0) {
+				fprintf(stderr, "Invalid heap size\n");
+				usage(stderr, argv[0]);
 				return -1;
 			}
-
-			r = NOJA_dumpStringBytecode(argv[3]);
+			
+		} else {
+			input = argv[i];
+			break;
 		}
-		else
-			r = NOJA_dumpFileBytecode(argv[2]);
-		return r ? 0 : -1;
 	}
 
-	if(!strcmp(argv[1], "help"))
-	{
-		fprintf(stdout, usage);
-		return 0;
+	int code;
+	switch (mode) {
+		
+		case Mode_HELP: 
+		help(stdout, argv[0]); 
+		code = 0; 
+		break;
+		
+		case Mode_DEFAULT: 
+		if (input == NULL) {
+			fprintf(stderr, "No input file");
+			code = -1;
+			break;
+		}
+		if (profile) {
+			if (no_file) code = NOJA_profileString(input, heap) ? 0 : -1;
+			else         code = NOJA_profileFile(input, heap)   ? 0 : -1;
+		} else {
+			if (output != NULL)
+				fprintf(stderr, "Ignoring option -o\n");
+			if (no_file) code = NOJA_runString(input, heap) ? 0 : -1;
+			else         code = NOJA_runFile(input, heap)   ? 0 : -1;
+		}
+		break;
+		
+		case Mode_ASSEMBLY:
+		if (input == NULL) {
+			fprintf(stderr, "No assembly input file");
+			code = -1;
+			break;
+		}
+		if (profile) {
+			if (no_file) code = NOJA_profileAssemblyString(input, heap) ? 0 : -1;
+			else         code = NOJA_profileAssemblyFile(input, heap)   ? 0 : -1;
+		} else {
+			if (output != NULL)
+				fprintf(stderr, "Ignoring option -o\n");
+			if (no_file) code = NOJA_runAssemblyString(input, heap) ? 0 : -1;
+			else         code = NOJA_runAssemblyFile(input, heap)   ? 0 : -1;
+		}
+		break;
+		case Mode_DISASSEMBLy:
+		if (input == NULL) {
+			fprintf(stderr, "No disassembly input file");
+			code = -1;
+			break;
+		}
+		if (no_file) code = NOJA_dumpStringBytecode(input) ? 0 : -1;
+		else         code = NOJA_dumpFileBytecode(input)   ? 0 : -1;
+		break;
 	}
 
-	fprintf(stderr, "Error: Incorrect usage.\n\n");
-	fprintf(stderr, usage);
-	return -1;
+	return code;
 }
+
+/*
+	noja [-o <file> | -p | {-d | -a}] [--] <file>
+	
+	-o can only be used with -d or -a
+	
+	-h --help
+	-d --disassembly disassembly
+	-i --inline      inline
+	-a --assembly
+    -p --profile
+	-o --output
+	
+    noja <file>
+    noja -i <code>
+
+*/
\ No newline at end of file
diff --git a/src/lib/builtins/basic.c b/src/lib/builtins/basic.c
index a2e7ffb..ed76e6d 100644
--- a/src/lib/builtins/basic.c
+++ b/src/lib/builtins/basic.c
@@ -61,6 +61,38 @@ static int bin_getCurrentWorkingDirectory(Runtime *runtime, Object **argv, unsig
 	return returnValues2(error, runtime, rets, "s", path);
 }
 
+static int bin_getCurrentScriptDirectory(Runtime *runtime, Object **argv, unsigned int argc, Object *rets[static MAX_RETS], Error *error)
+{
+	UNUSED(argc);
+	UNUSED(argv);
+	ASSERT(argc == 0);
+	const char *path = Runtime_GetCurrentScriptAbsolutePath(runtime);
+	if (path == NULL)
+		return returnValues2(error, runtime, rets, "n");
+
+	size_t len = strlen(path);
+
+	while (path[len-1] != '/') // This underflows if path has len 0 or doesn't contain a "/".
+		len--;
+	
+	Object *obj = Object_FromString(path, len, Runtime_GetHeap(runtime), error);
+	if (obj == NULL)
+		return -1;
+	rets[0] = obj;
+	return 1;
+}
+
+static int bin_getCurrentScriptLocation(Runtime *runtime, Object **argv, unsigned int argc, Object *rets[static MAX_RETS], Error *error)
+{
+	UNUSED(argc);
+	UNUSED(argv);
+	ASSERT(argc == 0);
+	const char *path = Runtime_GetCurrentScriptAbsolutePath(runtime);
+	if (path == NULL)
+		return returnValues2(error, runtime, rets, "n");
+	return returnValues2(error, runtime, rets, "s", path);
+}
+
 static int bin_typename(Runtime *runtime, Object **argv, unsigned int argc, Object *rets[static MAX_RETS], Error *error)
 {
 	UNUSED(argc);
@@ -364,5 +396,7 @@ StaticMapSlot bins_basic[] = {
 	{ "typename", SM_FUNCT, .as_funct = bin_typename, .argc = 1, },
 	{ "keysof", SM_FUNCT, .as_funct = bin_keysof, .argc = 1, },
 	{ "getCurrentWorkingDirectory", SM_FUNCT, .as_funct = bin_getCurrentWorkingDirectory, .argc = 0 },
+	{ "getCurrentScriptDirectory",  SM_FUNCT, .as_funct = bin_getCurrentScriptDirectory,  .argc = 0 },
+	{ "getCurrentScriptLocation",   SM_FUNCT, .as_funct = bin_getCurrentScriptLocation,   .argc = 0 },
 	{ NULL, SM_END, {}, {} },
 };
diff --git a/src/lib/builtins/net.c b/src/lib/builtins/net.c
index a27d6ae..fbeb267 100644
--- a/src/lib/builtins/net.c
+++ b/src/lib/builtins/net.c
@@ -163,7 +163,7 @@ static int bin_accept(Runtime *runtime, Object **argv, unsigned int argc, Object
 	int fd = pargs[0].as_int;
 	
 	struct sockaddr_in new_addr;
-	socklen_t new_addr_size;
+	socklen_t new_addr_size = sizeof(new_addr);
 	int new_fd = accept(fd, (struct sockaddr*) &new_addr, &new_addr_size);
 	if (new_fd < 0)
 		return returnValues2(error, runtime, rets, "ns", strerror(errno));
diff --git a/src/lib/builtins/start.noja b/src/lib/builtins/start.noja
index 88b30d4..a561866 100644
--- a/src/lib/builtins/start.noja
+++ b/src/lib/builtins/start.noja
@@ -124,13 +124,6 @@ fun stringFromMap(map: Map, can_use_method=true) {
 	return s;
 }
 
-fun integerFromDigit(char: String) {
-    res = ord(char) - ord('0');
-    if res < 0 or res > 9:
-    	error("String isn't a digit");
-    return res;
-}
-
 fun GenericIterator(T) return {
 	set : T,
 	keys : List,
@@ -191,6 +184,13 @@ return {
 		error(cat("Don't know how to convert ", typename(value), " to a string"));
 	}
 
+	fun integerFromDigit(char: String) {
+    	res = ord(char) - ord('0');
+	    if res < 0 or res > 9:
+    		error("String isn't a digit");
+    	return res;
+	}
+
 	fun isCallable(x)
 		return istypeof(Callable, x);
 
diff --git a/src/lib/builtins/string.c b/src/lib/builtins/string.c
index 9f4ce9f..1d1079d 100644
--- a/src/lib/builtins/string.c
+++ b/src/lib/builtins/string.c
@@ -91,11 +91,14 @@ static int bin_cat(Runtime *runtime, Object **argv, unsigned int argc, Object *r
             Error_Report(error, 0, "Argument #%d is not a string", i+1);
             return -1;
         }
+        
+        size_t length;
+        Object_GetString(argv[i], &length);
+        total_count += length;
 
-        total_count += Object_Count(argv[i], error);
-
-        if(error->occurred)
-            return -1;
+        // The Object_Count of a string doesn't match the
+        // byte count, but the second argument of Object_GetString
+        // does.
     }
 
     char starting[128];
@@ -112,8 +115,6 @@ static int bin_cat(Runtime *runtime, Object **argv, unsigned int argc, Object *r
         }
     }
 
-    Object *result = NULL;
-
     for(unsigned int i = 0, written = 0; i < argc; i += 1)
     {
         size_t length;
@@ -125,7 +126,7 @@ static int bin_cat(Runtime *runtime, Object **argv, unsigned int argc, Object *r
 
     buffer[total_count] = '\0';
 
-    result = Object_FromString(buffer, total_count, Runtime_GetHeap(runtime), error);
+    Object *result = Object_FromString(buffer, total_count, Runtime_GetHeap(runtime), error);
         
     if(starting != buffer)
         free(buffer);
diff --git a/src/lib/common/executable.c b/src/lib/common/executable.c
index dd75a94..1884ab5 100644
--- a/src/lib/common/executable.c
+++ b/src/lib/common/executable.c
@@ -110,7 +110,7 @@ static const InstrInfo instr_table[] = {
 	INSTR(PUSHTRU)
 	INSTR(PUSHFLS)
 	INSTR(PUSHNNE)
-	INSTR(PUSHFUN, OPTP_IDX, OPTP_INT)
+	INSTR(PUSHFUN, OPTP_IDX, OPTP_INT, OPTP_STRING)
 	INSTR(PUSHLST, OPTP_INT)
 	INSTR(PUSHMAP, OPTP_INT)
 	INSTR(PUSHTYP)
diff --git a/src/lib/compiler/codegen.c b/src/lib/compiler/codegen.c
index 096e618..2271418 100644
--- a/src/lib/compiler/codegen.c
+++ b/src/lib/compiler/codegen.c
@@ -255,18 +255,19 @@ static void emitInstrForArgumentNode(CodegenContext *ctx, ArgumentNode *arg, int
 	emitInstr_POP1(ctx, arg->base.offset, arg->base.length);
 }
 
-static void emitInstrForFuncExprNode(CodegenContext *ctx, FuncExprNode *func)
+static void emitInstrForFuncExprNode(CodegenContext *ctx, FuncExprNode *func, const char *name)
 {
 	Label *label_func = Label_New(ctx);
 	Label *label_jump = Label_New(ctx);
 
 	// Push function.
 	{
-		Operand ops[2] = {
+		Operand ops[3] = {
 			{ .type = OPTP_PROMISE, .as_promise = Label_ToPromise(label_func) },
 			{ .type = OPTP_INT,     .as_int     = func->argc },
+			{ .type = OPTP_STRING,  .as_string  = name },
 		};
-		CodegenContext_EmitInstr(ctx, OPCODE_PUSHFUN, ops, 2, func->base.base.offset, func->base.base.length);
+		CodegenContext_EmitInstr(ctx, OPCODE_PUSHFUN, ops, 3, func->base.base.offset, func->base.base.length);
 	}
 	emitInstr_JUMP(ctx, label_jump, func->base.base.offset, func->base.base.length); // Jump after the function code
 	Label_SetHere(label_func, ctx); // This is the function code index.
@@ -302,7 +303,7 @@ static void emitInstrForFuncExprNode(CodegenContext *ctx, FuncExprNode *func)
 
 static void emitInstrForFuncDeclNode(CodegenContext *ctx, FuncDeclNode *func)
 {
-	emitInstrForFuncExprNode(ctx, func->expr);
+	emitInstrForFuncExprNode(ctx, func->expr, func->name->val);
 	emitInstr_ASS(ctx, func->name->val, func->base.offset, func->base.length); // Assign variable
 	emitInstr_POP1(ctx, func->base.offset, func->base.length); // Pop function object
 }
@@ -557,7 +558,7 @@ static void emitInstrForExprNode(CodegenContext *ctx, ExprNode *expr,
 
 			Node *key  = m->keys;
 			Node *item = m->items;
-						
+			
 			while(item)
 			{
 				emitInstrForNode(ctx, key, label_break);
@@ -574,7 +575,7 @@ static void emitInstrForExprNode(CodegenContext *ctx, ExprNode *expr,
 		return;
 
 		case EXPR_FUNC:
-		emitInstrForFuncExprNode(ctx, (FuncExprNode*) expr);
+		emitInstrForFuncExprNode(ctx, (FuncExprNode*) expr, "???");
 		return;
 
 		case EXPR_SELECT:
diff --git a/src/lib/compiler/parse.c b/src/lib/compiler/parse.c
index 34aa331..cd24a75 100644
--- a/src/lib/compiler/parse.c
+++ b/src/lib/compiler/parse.c
@@ -489,12 +489,12 @@ static inline TokenKind next(Context *ctx, const char *file, int line)
 	Token *prev = ctx->token;
 
 	ctx->token = ctx->token->next;
-
+/*
 	fprintf(stderr, "NEXT [%.*s] -> [%.*s] from %s:%d\n", 
 		      prev->length, ctx->src +       prev->offset,
 		ctx->token->length, ctx->src + ctx->token->offset, 
 		file, line);
-
+*/
 	return current(ctx);
 }
 
diff --git a/src/lib/noja.c b/src/lib/noja.c
index b3e8a7c..489ee0b 100644
--- a/src/lib/noja.c
+++ b/src/lib/noja.c
@@ -5,6 +5,7 @@
 #include "compiler/compile.h"
 #include "assembler/assemble.h"
 #include "builtins/basic.h"
+#include "runtime/timing.h"
 #include "noja.h"
 
 static void print_error(const char *type, Error *error)
@@ -33,10 +34,23 @@ static void print_error(const char *type, Error *error)
     fprintf(stderr, "\n");
 }
 
-static _Bool interpret(Executable *exe)
-{
-    Runtime *runt = Runtime_New(-1, 1024*1024, NULL, NULL);
+#include <signal.h>
 
+Runtime *runt = NULL;
+
+static void signalHandler(int signo)
+{
+    (void) signo;
+    if (runt != NULL)
+       Runtime_Interrupt(runt);
+}
+
+static _Bool interpret(Executable *exe, bool time, size_t heap)
+{
+    RuntimeConfig config = Runtime_GetDefaultConfigs();
+    config.time = time;
+
+    runt = Runtime_New(heap, config);
     if(runt == NULL)
     {
         Error error;
@@ -46,6 +60,8 @@ static _Bool interpret(Executable *exe)
         Error_Free(&error);
         return 0;
     }
+    signal(SIGINT,  signalHandler);
+    signal(SIGTERM, signalHandler);
 
     // We use a [RuntimeError] instead of a simple [Error]
     // because the [RuntimeError] makes a snapshot of the
@@ -158,6 +174,37 @@ static _Bool interpret(Executable *exe)
         RuntimeError_Free(&error);
     }
 
+    TimingTable *table = Runtime_GetTimingTable(runt);
+    if (table != NULL) {
+
+        const char *file = "profiling-results.txt";
+
+        FILE *stream = fopen(file, "wb");
+        if (stream == NULL) {
+            fprintf(stderr, "Failed to serialize profiling results\n");
+        } else {
+            
+            const FunctionExecutionSummary *summary;
+            size_t count;
+            
+            summary = TimingTable_getSummary(table, &count);
+            assert(summary != NULL);
+            
+            for (size_t i = 0; i < count; i++) {
+                if (summary[i].calls > 0) {
+                    fprintf(stream, "%20s - %s - %ld calls - %.2lfus\n",
+                           summary[i].name,
+                           Source_GetName(summary[i].src),
+                           summary[i].calls,
+                           summary[i].time * 1000000);
+                }
+            }
+            
+            fclose(stream);
+            fprintf(stderr, "Wrote profiling result to %s\n", file);
+        }
+    }
+
     Runtime_Free(runt);
     return retc > -1;
 }
@@ -193,7 +240,7 @@ static _Bool disassemble(Source *src)
     return 1;
 }
 
-static _Bool interpret_file(const char *file)
+static _Bool interpret_file(const char *file, bool time, size_t heap)
 {
     Error error;
     Error_Init(&error);
@@ -213,14 +260,14 @@ static _Bool interpret_file(const char *file)
         return 0;
     }
 
-    _Bool r = interpret(exe);
+    _Bool r = interpret(exe, time, heap);
 
     Executable_Free(exe);
     Source_Free(src);
     return r;
 }
 
-static _Bool interpret_code(const char *code)
+static _Bool interpret_code(const char *code, bool time, size_t heap)
 {
     Error error;
     Error_Init(&error);
@@ -241,14 +288,14 @@ static _Bool interpret_code(const char *code)
         return 0;
     }
 
-    _Bool r = interpret(exe);
+    _Bool r = interpret(exe, time, heap);
 
     Executable_Free(exe);
     Source_Free(src);
     return r;
 }
 
-static _Bool interpret_asm_file(const char *file)
+static _Bool interpret_asm_file(const char *file, bool time, size_t heap)
 {
     Error error;
     Error_Init(&error);
@@ -262,7 +309,7 @@ static _Bool interpret_asm_file(const char *file)
         Error_Free(&error);
         return 0;
     }
-
+    
     Executable *exe = assemble(src, &error);
     if(exe == NULL) {
         print_error("Assemblation", &error);
@@ -271,7 +318,7 @@ static _Bool interpret_asm_file(const char *file)
         return 0;
     }
 
-    _Bool r = interpret(exe);
+    _Bool r = interpret(exe, time, heap);
 
     Executable_Free(exe);
     Source_Free(src);
@@ -279,7 +326,7 @@ static _Bool interpret_asm_file(const char *file)
     return r;
 }
 
-static _Bool interpret_asm_code(const char *code)
+static _Bool interpret_asm_code(const char *code, bool time, size_t heap)
 {
     Error error;
     Error_Init(&error);
@@ -302,7 +349,7 @@ static _Bool interpret_asm_code(const char *code)
         return 0;
     }
 
-    _Bool r = interpret(exe);
+    _Bool r = interpret(exe, time, heap);
 
     Executable_Free(exe);
     Source_Free(src);
@@ -352,14 +399,14 @@ static _Bool disassemble_code(const char *code)
     return r;
 }
 
-_Bool NOJA_runString(const char *str)
+_Bool NOJA_runString(const char *str, size_t heap)
 {
-    return interpret_code(str);
+    return interpret_code(str, false, heap);
 }
 
-_Bool NOJA_runFile(const char *file)
+_Bool NOJA_runFile(const char *file, size_t heap)
 {
-    return interpret_file(file);
+    return interpret_file(file, false, heap);
 }
 
 _Bool NOJA_dumpFileBytecode(const char *file)
@@ -372,12 +419,32 @@ _Bool NOJA_dumpStringBytecode(const char *str)
     return disassemble_code(str);
 }
 
-_Bool NOJA_runAssemblyFile(const char *file)
+_Bool NOJA_runAssemblyFile(const char *file, size_t heap)
 {
-    return interpret_asm_file(file);
+    return interpret_asm_file(file, false, heap);
 }
 
-_Bool NOJA_runAssemblyString(const char *str)
+_Bool NOJA_runAssemblyString(const char *str, size_t heap)
 {
-    return interpret_asm_code(str);
-}
\ No newline at end of file
+    return interpret_asm_code(str, false, heap);
+}
+
+_Bool NOJA_profileString(const char *str, size_t heap)
+{
+    return interpret_code(str, true, heap);
+}
+
+_Bool NOJA_profileFile(const char *file, size_t heap)
+{
+    return interpret_file(file, true, heap);
+}
+
+_Bool NOJA_profileAssemblyFile(const char *file, size_t heap)
+{
+    return interpret_asm_file(file, true, heap);
+}
+
+_Bool NOJA_profileAssemblyString(const char *str, size_t heap)
+{
+    return interpret_asm_code(str, true, heap);
+}
diff --git a/src/lib/noja.h b/src/lib/noja.h
index a4979f8..ad99f90 100644
--- a/src/lib/noja.h
+++ b/src/lib/noja.h
@@ -1,9 +1,13 @@
 #ifndef NOJA_H
 #define NOJA_H
-_Bool NOJA_runFile  (const char *file);
-_Bool NOJA_runString(const char *str);
-_Bool NOJA_runAssemblyFile(const char *file);
-_Bool NOJA_runAssemblyString(const char *str);
+_Bool NOJA_runFile  (const char *file, size_t heap);
+_Bool NOJA_runString(const char *str, size_t heap);
+_Bool NOJA_runAssemblyFile(const char *file, size_t heap);
+_Bool NOJA_runAssemblyString(const char *str, size_t heap);
 _Bool NOJA_dumpFileBytecode(const char *file);
 _Bool NOJA_dumpStringBytecode(const char *str);
-#endif /* NOJA_H */
\ No newline at end of file
+_Bool NOJA_profileFile(const char *file, size_t heap);
+_Bool NOJA_profileString(const char *str, size_t heap);
+_Bool NOJA_profileAssemblyFile(const char *file, size_t heap);
+_Bool NOJA_profileAssemblyString(const char *str, size_t heap);
+#endif /* NOJA_H */
diff --git a/src/lib/objects/heap.c b/src/lib/objects/heap.c
index 740c80d..4e68fc0 100644
--- a/src/lib/objects/heap.c
+++ b/src/lib/objects/heap.c
@@ -299,9 +299,9 @@ void *Heap_RawMalloc(Heap *heap, int size, Error *err)
 			Error_Report(err, 1, "Out of heap");
 			return NULL;
 		}
-
+		
 		OflowAlloc *oflow = malloc(sizeof(OflowAlloc) + size);
-
+		
 		if(oflow == 0)
 			return 0;
 
@@ -355,68 +355,73 @@ _Bool Heap_StartCollection(Heap *heap, Error *error)
 	return 1;
 }
 
-_Bool Heap_StopCollection(Heap *heap)
+static bool callDestructors(Heap *heap)
 {
-	assert(heap->collecting == 1);
+	int i = 0;
 
-	if(heap->collection_failed)
+	while(i < heap->pend_used)
 	{
-		free(heap->old_body);
-		return 0;
-	}
+		Object *obj = heap->pend[i].object;
 
-	/* Call destructors here */
-	{
-		int i = 0;
-	
-		while(i < heap->pend_used)
+		if(obj->flags & Object_MOVED)
 		{
-			Object *obj = heap->pend[i].object;
-
-			if(obj->flags & Object_MOVED)
-			{
-				heap->pend[i].object = ((MovedObject*) heap->pend[i].object)->new_location;
-				i += 1;
-			}
-			else
-			{
-				// We need to call the destructor.
-
-				heap->pend[i].destructor(obj, heap->error);
-						
-				if(heap->error->occurred) 
-					return 0; // There will be leaks.
-				
-				heap->pend[i] = heap->pend[heap->pend_used-1];
-				heap->pend_used -= 1;
-			}
+			heap->pend[i].object = ((MovedObject*) heap->pend[i].object)->new_location;
+			i += 1;
 		}
-
-		if(heap->pend_size / 2 > heap->pend_used)
+		else
 		{
-			// Downsize
-			void *temp = realloc(heap->pend, heap->pend_size / 2 * sizeof(PendingDestruct));
+			// We need to call the destructor.
 
-			if(temp != NULL)
-			{
-				heap->pend = temp;
-				heap->pend_size /= 2;
-			}
+			heap->pend[i].destructor(obj, heap->error);
+					
+			if(heap->error->occurred) 
+				return false; // There will be leaks.
+			
+			heap->pend[i] = heap->pend[heap->pend_used-1];
+			heap->pend_used -= 1;
 		}
 	}
 
+	if(heap->pend_size / 2 > heap->pend_used)
+	{
+		// Downsize
+		void *temp = realloc(heap->pend, heap->pend_size / 2 * sizeof(PendingDestruct));
+
+		if(temp != NULL)
+		{
+			heap->pend = temp;
+			heap->pend_size /= 2;
+		}
+	}
+
+	return true;
+}
+
+static void freeOverflowAllocations(Heap *heap)
+{
 	while(heap->old_oflow)
 	{
 		OflowAlloc *prev = heap->old_oflow->prev;
 		free(heap->old_oflow);
 		heap->old_oflow = prev;
 	}
+}
+
+_Bool Heap_StopCollection(Heap *heap)
+{
+	assert(heap->collecting == 1);
+
+	if(!callDestructors(heap))
+		return false;
+	
+	freeOverflowAllocations(heap);
 
 	free(heap->old_body);
 
 	heap->collecting = 0;
 	heap->objcount = heap->movedcount;
-	return 1;
+
+	return !heap->collection_failed;
 }
 
 void Heap_CollectExtension(void **referer, unsigned int size, void *userp)
diff --git a/src/lib/runtime/o_func.c b/src/lib/runtime/o_func.c
index 3ce55aa..6b3cd18 100644
--- a/src/lib/runtime/o_func.c
+++ b/src/lib/runtime/o_func.c
@@ -28,18 +28,22 @@
 ** +--------------------------------------------------------------------------+ 
 */
 
+#include <time.h>
 #include <assert.h>
 #include <stdlib.h>
 #include "../utils/defs.h"
 #include "../objects/objects.h"
+#include "timing.h"
 #include "runtime.h"
 
 typedef struct {
 	Object base;
+	const char *name;
 	Runtime *runtime;
 	Executable *exe;
 	int index, argc;
 	Object *closure;
+	TimingID timing_id;
 } FunctionObject;
 
 static _Bool free_(Object *self, Error *error)
@@ -108,10 +112,28 @@ static int call(Object *self, Object **argv, unsigned int argc, Object *rets[sta
 		// The right amount of arguments was provided.
 		argv2 = argv;
 
+	clock_t begin;
+	TimingID timing_id;
+	TimingTable *timing_table = Runtime_GetTimingTable(func->runtime);
+	if (timing_table != NULL) {
+		begin = clock();
+
+		// Need to save the object's member
+	    // before the run function since it
+	    // may trigger a GC cycle invalidating
+	    // the object pointer.
+		timing_id = func->timing_id;
+	}
+
 	int retc = run(func->runtime, error, func->exe, func->index, func->closure, argv2, expected_argc, rets);
 
-	// NOTE: Every object reference is invalidated from here.
+	if (timing_table != NULL) {
+		double time = (double) (clock() - begin) / CLOCKS_PER_SEC;
+		TimingTable_sumCallTime(timing_table, timing_id, time);
+	}
 
+	// NOTE: Every object reference is invalidated from here.
+	
 	if(argv2 != argv)
 		free(argv2);
 
@@ -157,7 +179,7 @@ static TypeObject t_func = {
  *   The newly created object. If an error occurred, NULL is returned
  *   and information about the error is stored in the [error] argument.
  */
-Object *Object_FromNojaFunction(Runtime *runtime, Executable *exe, int index, int argc, Object *closure, Heap *heap, Error *error)
+Object *Object_FromNojaFunction(Runtime *runtime, const char *name, Executable *exe, int index, int argc, Object *closure, Heap *heap, Error *error)
 {
 	assert(runtime != NULL);
 	assert(exe != NULL);
@@ -180,10 +202,19 @@ Object *Object_FromNojaFunction(Runtime *runtime, Executable *exe, int index, in
 	}
 
 	func->runtime = runtime;
+	func->name = name; // Should this be copied?
 	func->exe = exe_copy;
 	func->index = index;
 	func->argc = argc;
 	func->closure = closure;
 
+	TimingTable *table = Runtime_GetTimingTable(runtime);
+	if (table != NULL) {
+		#warning "TODO: Calculate line number"
+		size_t line = 0;
+		Source *src = Executable_GetSource(exe);
+		func->timing_id = TimingTable_newEntry(table, src, line, name);
+	}
+
 	return (Object*) func;
 }
\ No newline at end of file
diff --git a/src/lib/runtime/runtime.c b/src/lib/runtime/runtime.c
index be83a56..cd9bdaa 100644
--- a/src/lib/runtime/runtime.c
+++ b/src/lib/runtime/runtime.c
@@ -31,6 +31,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <stdbool.h>
 #include "runtime.h"
 #include "../utils/path.h"
 #include "../utils/defs.h"
@@ -49,16 +50,25 @@ struct xFrame {
 };
 
 struct xRuntime {
-	void *callback_userp;
-	_Bool (*callback_addr)(Runtime*, void*);
+	bool interrupt;
+	RuntimeCallback callback;
 	_Bool free_heap;
 	Object *builtins;
 	int    depth;
 	Frame *frame;
 	Stack *stack;
 	Heap  *heap;
+	TimingTable *timing;
 };
 
+RuntimeConfig Runtime_GetDefaultConfigs()
+{
+    return (RuntimeConfig) {
+        .stack = 1024,
+        .callback = { .func = NULL, .data = NULL },
+        .time = false,
+    };
+}
 
 // Returns the length written in buff (not considering the zero byte)
 size_t Runtime_GetCurrentScriptFolder(Runtime *runtime, char *buff, size_t buffsize)
@@ -153,50 +163,69 @@ Executable *Runtime_GetCurrentExecutable(Runtime *runtime)
 		return runtime->frame->exe;
 }
 
-Runtime *Runtime_New2(int stack_size, Heap *heap, _Bool free_heap, void *callback_userp, _Bool (*callback_addr)(Runtime*, void*))
+TimingTable *Runtime_GetTimingTable(Runtime *runtime)
 {
-	if(stack_size < 0)
-		stack_size = 1024;
+	return runtime->timing;
+}
 
+void Runtime_Interrupt(Runtime *runtime)
+{
+	runtime->interrupt = true;
+}
+
+Runtime *Runtime_New2(Heap *heap, _Bool free_it, RuntimeConfig config)
+{
 	Runtime *runtime = malloc(sizeof(Runtime));
+	if (runtime == NULL)
+		return NULL;
 
-	if(runtime != NULL)
-	{
-		runtime->heap = heap;
-		runtime->stack = Stack_New(stack_size);
-
-		if(runtime->stack == NULL)
-		{
-			Heap_Free(runtime->heap);
-			free(runtime);
-		}
-
-		runtime->free_heap = free_heap;
-		runtime->callback_userp = callback_userp;
-		runtime->callback_addr = callback_addr;
-		runtime->builtins = NULL;
-		runtime->frame = NULL;
-		runtime->depth = 0;
+	runtime->stack = Stack_New(config.stack);
+	if(runtime->stack == NULL) {
+		if (free_it)
+			Heap_Free(heap);
+		free(runtime);
+		return NULL;
 	}
 
+	TimingTable *timing_table = NULL;
+	if (config.time) {
+		timing_table = TimingTable_new();
+		if (timing_table == NULL) {
+			if (free_it)
+				Heap_Free(heap);
+			free(runtime);
+			return NULL;
+		}
+	}
+	
+
+	runtime->interrupt = false;
+	runtime->timing = timing_table;
+	runtime->heap = heap;
+	runtime->free_heap = free_it;
+	runtime->callback = config.callback;
+	runtime->builtins = NULL;
+	runtime->frame = NULL;
+	runtime->depth = 0;
+
 	return runtime;
 }
 
-Runtime *Runtime_New(int stack_size, int heap_size, void *callback_userp, _Bool (*callback_addr)(Runtime*, void*))
+Runtime *Runtime_New(int heap_size, RuntimeConfig config)
 {
 	if(heap_size < 0)
 		heap_size = 65536;
 
 	Heap *heap = Heap_New(heap_size);
+	if(heap == NULL) return NULL;
 
-	if(heap == NULL)
-		return NULL;
-
-	return Runtime_New2(stack_size, heap, 1, callback_userp, callback_addr);
+	return Runtime_New2(heap, 1, config);
 }
 
 void Runtime_Free(Runtime *runtime)
 {
+	if (runtime->timing != NULL)
+		TimingTable_free(runtime->timing);
 	if(runtime->free_heap)
 		Heap_Free(runtime->heap);
 	Stack_Free(runtime->stack);
@@ -839,6 +868,7 @@ static _Bool step(Runtime *runtime, Error *error)
 		{
 			ASSERT(opc == 1);
 			ASSERT(ops[0].type == OPTP_STRING);
+			const char *name = ops[0].as_string;
 
 			if(runtime->frame->used == 0)
 			{
@@ -849,7 +879,7 @@ static _Bool step(Runtime *runtime, Error *error)
 			Object *val = Stack_Top(runtime->stack, 0);
 			ASSERT(val != NULL);
 
-			Object *key = Object_FromString(ops[0].as_string, -1, runtime->heap, error);
+			Object *key = Object_FromString(name, -1, runtime->heap, error);
 
 			if(key == NULL)
 				return 0;
@@ -1204,16 +1234,17 @@ static _Bool step(Runtime *runtime, Error *error)
 
 		case OPCODE_PUSHFUN:
 		{
-			ASSERT(opc == 2);
+			ASSERT(opc == 3);
 			ASSERT(ops[0].type == OPTP_IDX);
 			ASSERT(ops[1].type == OPTP_INT);
+			ASSERT(ops[2].type == OPTP_STRING);
 
 			Object *closure = Object_NewClosure(runtime->frame->closure, runtime->frame->locals, Runtime_GetHeap(runtime), error);
 
 			if(closure == NULL)
 				return 0;
 
-			Object *obj = Object_FromNojaFunction(runtime, runtime->frame->exe, ops[0].as_int, ops[1].as_int, closure, runtime->heap, error);
+			Object *obj = Object_FromNojaFunction(runtime, ops[2].as_string, runtime->frame->exe, ops[0].as_int, ops[1].as_int, closure, runtime->heap, error);
 
 			if(obj == NULL)
 				return 0;
@@ -1470,34 +1501,23 @@ int run(Runtime *runtime, Error *error,
 
 	// Run the code.
 
-	if(runtime->callback_addr != NULL)
-	{
-		if(!runtime->callback_addr(runtime, runtime->callback_userp))
-			Error_Report(error, 0, "Forced abortion");
-		else
-			while(step(runtime, error))
-			{
-				if(!runtime->callback_addr(runtime, runtime->callback_userp))
-				{
-					Error_Report(error, 0, "Forced abortion");
-					break;
-				}
 
-				//printf("%2.2f%% percent.\n", Heap_GetUsagePercentage(runtime->heap));
-
-				if(Heap_GetUsagePercentage(runtime->heap) > 100)
-					if(!collect(runtime, error))
-						break;
-			}
-	}
+	if(runtime->interrupt || (runtime->callback.func != NULL && !runtime->callback.func(runtime, runtime->callback.data)))
+		Error_Report(error, 0, "Forced abortion");
 	else
 		while(step(runtime, error))
 		{
+			if(runtime->interrupt || (runtime->callback.func != NULL && !runtime->callback.func(runtime, runtime->callback.data)))
+			{
+				Error_Report(error, 0, "Forced abortion");
+				break;
+			}
+
+			//printf("%2.2f%% percent.\n", Heap_GetUsagePercentage(runtime->heap));
+
 			if(Heap_GetUsagePercentage(runtime->heap) > 100)
 				if(!collect(runtime, error))
 					break;
-
-			//printf("%2.2f%% percent.\n", Heap_GetUsagePercentage(runtime->heap));
 		}
 
 	// If an error occurred, we want to return NULL.
diff --git a/src/lib/runtime/runtime.h b/src/lib/runtime/runtime.h
index 8294215..284ba13 100644
--- a/src/lib/runtime/runtime.h
+++ b/src/lib/runtime/runtime.h
@@ -32,6 +32,7 @@
 #define RUNTIME_H
 
 #include <stdio.h> // meh.. just for the definition of FILE.
+#include "timing.h"
 #include "../utils/error.h"
 #include "../utils/stack.h"
 #include "../objects/objects.h"
@@ -40,19 +41,34 @@
 typedef struct xRuntime Runtime;
 typedef struct xSnapshot Snapshot;
 
-Runtime*	Runtime_New(int stack_size, int heap_size, void *callback_userp, _Bool (*callback_addr)(Runtime*, void*));
-Runtime*	Runtime_New2(int stack_size, Heap *heap, _Bool free_heap, void *callback_userp, _Bool (*callback_addr)(Runtime*, void*));
-void 		Runtime_Free(Runtime *runtime);
-_Bool 		Runtime_Pop(Runtime *runtime, Error *error, unsigned int n);
-_Bool 		Runtime_Push(Runtime *runtime, Error *error, Object *obj);
-Heap*		Runtime_GetHeap(Runtime *runtime);
-Stack*		Runtime_GetStack(Runtime *runtime);
-Object*		Runtime_GetBuiltins(Runtime *runtime);
-void 		Runtime_SetBuiltins(Runtime *runtime, Object *builtins);
-int 		Runtime_GetCurrentIndex(Runtime *runtime);
-Executable *Runtime_GetCurrentExecutable(Runtime *runtime);
-size_t      Runtime_GetCurrentScriptFolder(Runtime *runtime, char *buff, size_t buffsize);
-const char *Runtime_GetCurrentScriptAbsolutePath(Runtime *runtime);
+typedef struct {
+    bool (*func)(Runtime*, void*);
+    void  *data;
+} RuntimeCallback;
+
+typedef struct {
+    bool time;
+    size_t stack;
+    RuntimeCallback callback;
+} RuntimeConfig;
+
+Runtime*	 Runtime_New(int heap_size, RuntimeConfig config);
+Runtime*	 Runtime_New2(Heap *heap, bool free_it, RuntimeConfig config);
+void 		 Runtime_Free(Runtime *runtime);
+_Bool 		 Runtime_Pop(Runtime *runtime, Error *error, unsigned int n);
+_Bool 		 Runtime_Push(Runtime *runtime, Error *error, Object *obj);
+void         Runtime_Interrupt(Runtime *runtime);
+Heap*		 Runtime_GetHeap(Runtime *runtime);
+Stack*		 Runtime_GetStack(Runtime *runtime);
+Object*		 Runtime_GetBuiltins(Runtime *runtime);
+void 		 Runtime_SetBuiltins(Runtime *runtime, Object *builtins);
+int 		 Runtime_GetCurrentIndex(Runtime *runtime);
+Executable  *Runtime_GetCurrentExecutable(Runtime *runtime);
+size_t       Runtime_GetCurrentScriptFolder(Runtime *runtime, char *buff, size_t buffsize);
+const char  *Runtime_GetCurrentScriptAbsolutePath(Runtime *runtime);
+TimingTable *Runtime_GetTimingTable(Runtime *runtime);
+RuntimeConfig Runtime_GetDefaultConfigs();
+
 Snapshot   *Snapshot_New(Runtime *runtime);
 void 	    Snapshot_Free(Snapshot *snapshot);
 void 	    Snapshot_Print(Snapshot *snapshot, FILE *fp);
@@ -90,8 +106,9 @@ struct StaticMapSlot {
 };
 
 Object *Object_NewStaticMap(StaticMapSlot slots[], void (*initfn)(StaticMapSlot[]), Runtime *runt, Error *error);
-Object *Object_FromNojaFunction(Runtime *runtime, Executable *exe, int index, int argc, Object *closure, Heap *heap, Error *error);
+Object *Object_FromNojaFunction(Runtime *runtime, const char *name, Executable *exe, int index, int argc, Object *closure, Heap *heap, Error *error);
 Object *Object_FromNativeFunction(Runtime *runtime, int (*callback)(Runtime*, Object**, unsigned int, Object*[static MAX_RETS], Error*), int argc, Heap *heap, Error *error);
+
 typedef struct {
     Error base;
     Runtime *runtime;
diff --git a/src/lib/runtime/timing.c b/src/lib/runtime/timing.c
new file mode 100644
index 0000000..0d48b0c
--- /dev/null
+++ b/src/lib/runtime/timing.c
@@ -0,0 +1,76 @@
+#include <stdlib.h>
+#include <string.h>
+#include "timing.h"
+#include "../utils/defs.h"
+
+struct TimingTable {
+	FunctionExecutionSummary *entries;
+	size_t size, used;
+};
+
+TimingTable *TimingTable_new()
+{
+	TimingTable *table = malloc(sizeof(TimingTable));
+	if (table == NULL)
+		return NULL;
+	table->entries = NULL;
+	table->size = 0;
+	table->used = 0;
+	return table;
+}
+
+void TimingTable_free(TimingTable *table)
+{
+	if (table != NULL) {
+		for(size_t i = 0; i < table->used; i++) {
+			free(table->entries[i].name);
+			Source_Free(table->entries[i].src);
+		}
+		free(table->entries);
+		free(table);
+	}
+}
+
+void TimingTable_sumCallTime(TimingTable *table, TimingID id, double time)
+{
+	if (id < 0 || id >= (int) table->used)
+		abort();
+	
+	table->entries[id].calls++;
+	table->entries[id].time += time;
+}
+
+TimingID TimingTable_newEntry(TimingTable *table, Source *src, size_t line, const char *name)
+{
+	if (table->size == table->used) {
+		
+		size_t new_size = 2 * table->size;
+		if (new_size == 0) new_size = 8;
+
+		void *temp = realloc(table->entries, new_size * sizeof(FunctionExecutionSummary));
+		if (temp == NULL) abort();
+		
+		table->entries = temp;
+		table->size = new_size;
+	}
+	
+	char *name2 = strdup(name);
+	if (name2 == NULL)
+		abort();
+	
+	TimingID id = (int) table->used++;
+	table->entries[id].src = Source_Copy(src);
+	table->entries[id].line = line;
+	table->entries[id].name = name2;
+	table->entries[id].time = 0;
+	table->entries[id].calls = 0;
+	return id;
+}
+
+const FunctionExecutionSummary*
+TimingTable_getSummary(TimingTable *table, size_t *count)
+{
+	ASSERT(table != NULL && count != NULL);
+	*count = table->used;
+	return table->entries;
+}
\ No newline at end of file
diff --git a/src/lib/runtime/timing.h b/src/lib/runtime/timing.h
new file mode 100644
index 0000000..16b6be6
--- /dev/null
+++ b/src/lib/runtime/timing.h
@@ -0,0 +1,23 @@
+#ifndef TIMING_H
+#define TIMING_H
+
+#include <stddef.h>
+#include "../utils/source.h"
+
+typedef struct {
+	size_t calls;
+	double time;
+	size_t line;
+	char  *name;
+	Source *src;
+} FunctionExecutionSummary;
+
+typedef int TimingID;
+typedef struct TimingTable TimingTable;
+TimingTable *TimingTable_new();
+void         TimingTable_free(TimingTable *table);
+TimingID     TimingTable_newEntry(TimingTable *table, Source *src, size_t line, const char *name);
+void         TimingTable_sumCallTime(TimingTable *table, TimingID id, double time);
+TimingTable *TimingTable_getDefaultTable();
+const FunctionExecutionSummary *TimingTable_getSummary(TimingTable *table, size_t *count);
+#endif
\ No newline at end of file