Added comments

tvm_lexer.h

@@ -14,6 +14,7 @@ typedef struct tvm_lexer_s
 tvm_lexer_t* lexer_create();
 void lexer_destroy(tvm_lexer_t* l);
 
+/* Tokenize the character array "source" into lines and tokens */
 int lex(tvm_lexer_t* lexer, char* source);
 
 #endif

tvm_program.c

@@ -13,8 +13,6 @@ static void parse_instructions(tvm_program_t* p, const char** tokens, tvm_memory
 tvm_program_t* create_program()
 {
 	tvm_program_t* p = (tvm_program_t*)calloc(1, sizeof(tvm_program_t));
-	if(!p) return NULL;
-
 	p->label_htab = create_htab();
 
 	return p;

tvm_stack.h

@@ -5,6 +5,7 @@
 
 #include "tvm_memory.h"
 
+/* Initialize our stack by setting the base pointer and stack pointer */
 void create_stack(tvm_memory_t* mem, size_t size);
 
 void stack_push(tvm_memory_t* mem, int* item);