Parsing exprs, enum_decls, Introduce intern table, symbol table

os_win32.c

@@ -0,0 +1,41 @@
+function S32 os_main();
+const SizeU page_size = 4096;
+
+LRESULT CALLBACK 
+WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){
+  return DefWindowProcW(hwnd, uMsg, wParam, lParam);;
+}
+
+int
+WinMain(HINSTANCE hInstance, HINSTANCE a, LPSTR b, int nShowCmd){
+  wchar_t *CLASS_NAME  = L"Cool window class";
+  wchar_t *WINDOW_NAME = L"Have a good day!";
+  
+  WNDCLASSW wc = { };
+  wc.lpfnWndProc   = WindowProc;
+  wc.hInstance     = hInstance;
+  wc.lpszClassName = CLASS_NAME;
+  RegisterClassW(&wc);
+  
+  HWND window_handle = CreateWindowExW(0, CLASS_NAME, WINDOW_NAME, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 0, 0, hInstance, 0);
+  ShowWindow(window_handle, nShowCmd);
+  return os_main();
+}
+
+function OS_Memory
+os_reserve(SizeU size){
+  OS_Memory result = {0};
+  SizeU adjusted_size = align_up(size, page_size);
+  result.data = VirtualAlloc(0, adjusted_size, MEM_RESERVE, PAGE_READWRITE);
+  assert_msg(result.data, "Failed to reserve virtual memory");
+  result.reserve = adjusted_size;
+  return result;
+}
+
+function void
+os_commit(OS_Memory *m, SizeU size){
+  SizeU commit = align_up(size, page_size);
+  void *p = VirtualAlloc((U8 *)m->data + m->commit, commit, MEM_COMMIT, PAGE_READWRITE);
+  assert_msg(p, "Failed to commit more memory");
+  m->commit += commit;
+}