Parsing exprs, enum_decls, Introduce intern table, symbol table

memory.c

@@ -0,0 +1,47 @@
+global const SizeU default_reserve_size   = gib(4);
+global const SizeU default_alignment      = 8;
+global const SizeU additional_commit_size = mib(1);
+
+function void
+memory_copy(U8 *dst, U8 *src, SizeU size){
+  for(SizeU i = 0; i < size; i++){
+    dst[i] = src[i];
+  }
+}
+
+function void
+memory_zero(void *p, SizeU size){
+  U8 *pp = p;
+  for(SizeU i = 0; i < size; i++)
+    pp[i] = 0;
+}
+
+function void
+arena_init(Arena *a){
+  a->memory = os_reserve(default_reserve_size);
+  a->alignment = default_alignment;
+}
+
+function void *
+arena_push_size(Arena *a, SizeU size){
+  SizeU generous_size = size + a->alignment;
+  if(generous_size>a->memory.commit){
+    if(a->memory.reserve == 0){
+      arena_init(a);
+    }
+    os_commit(&a->memory, generous_size+additional_commit_size);
+  }
+  
+  a->len = align_up(a->len, a->alignment);
+  void *result = (U8*)a->memory.data + a->len;
+  a->len += size;
+  return result;
+}
+
+function String
+arena_push_string_copy(Arena *arena, String string){
+  U8 *copy = arena_push_array(arena, U8, string.len+1);
+  memory_copy(copy, string.str, string.len);
+  copy[string.len] = 0;
+  return (String){copy, string.len};
+}