diff --git a/custom.el b/custom.el
index 754a395..116096d 100644
--- a/custom.el
+++ b/custom.el
@@ -122,7 +122,9 @@
      ("shell" . sh)
      ("bash" . sh)))
  '(package-selected-packages
-   '(nginx-mode
+   '(jinja2-mode
+     masm-mode
+     nginx-mode
      disable-mouse
      meghanada
      pip-requirements
diff --git a/elpa/jinja2-mode-0.2/jinja2-mode-autoloads.el b/elpa/jinja2-mode-0.2/jinja2-mode-autoloads.el
new file mode 100644
index 0000000..149c782
--- /dev/null
+++ b/elpa/jinja2-mode-0.2/jinja2-mode-autoloads.el
@@ -0,0 +1,29 @@
+;;; jinja2-mode-autoloads.el --- automatically extracted autoloads
+;;
+;;; Code:
+
+(add-to-list 'load-path (directory-file-name
+                         (or (file-name-directory #$) (car load-path))))
+
+
+;;;### (autoloads nil "jinja2-mode" "jinja2-mode.el" (0 0 0 0))
+;;; Generated autoloads from jinja2-mode.el
+
+(autoload 'jinja2-mode "jinja2-mode" "\
+Major mode for editing jinja2 files
+
+\(fn)" t nil)
+
+(add-to-list 'auto-mode-alist '("\\.jinja2\\'" . jinja2-mode))
+
+(if (fboundp 'register-definition-prefixes) (register-definition-prefixes "jinja2-mode" '("jinja2-" "sgml-indent-line-num")))
+
+;;;***
+
+;; Local Variables:
+;; version-control: never
+;; no-byte-compile: t
+;; no-update-autoloads: t
+;; coding: utf-8
+;; End:
+;;; jinja2-mode-autoloads.el ends here
diff --git a/elpa/jinja2-mode-0.2/jinja2-mode-pkg.el b/elpa/jinja2-mode-0.2/jinja2-mode-pkg.el
new file mode 100644
index 0000000..0c89b5c
--- /dev/null
+++ b/elpa/jinja2-mode-0.2/jinja2-mode-pkg.el
@@ -0,0 +1,2 @@
+;;; Generated package description from jinja2-mode.el  -*- no-byte-compile: t -*-
+(define-package "jinja2-mode" "0.2" "A major mode for jinja2" 'nil :commit "cfaa7bbe7bb290cc500440124ce89686f3e26f86" :authors '(("Florian Mounier aka paradoxxxzero")) :maintainer '("Florian Mounier aka paradoxxxzero"))
diff --git a/elpa/jinja2-mode-0.2/jinja2-mode.el b/elpa/jinja2-mode-0.2/jinja2-mode.el
new file mode 100644
index 0000000..51798c9
--- /dev/null
+++ b/elpa/jinja2-mode-0.2/jinja2-mode.el
@@ -0,0 +1,330 @@
+;;; jinja2-mode.el --- A major mode for jinja2
+
+;; Copyright (C) 2011 Florian Mounier aka paradoxxxzero
+
+;; Author: Florian Mounier aka paradoxxxzero
+;; Version: 0.2
+;; Package-Version: 0.2
+;; Package-Commit: cfaa7bbe7bb290cc500440124ce89686f3e26f86
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;   This is an emacs major mode for jinja2 with:
+;;        syntax highlighting
+;;        sgml/html integration
+;;        indentation (working with sgml)
+;;        more to come
+
+;; This file comes from http://github.com/paradoxxxzero/jinja2-mode
+
+;;; Code:
+
+(require 'sgml-mode)
+
+(defgroup jinja2 nil
+  "Major mode for editing jinja2 code."
+  :prefix "jinja2-"
+  :group 'languages)
+
+(defcustom jinja2-user-keywords nil
+  "Custom keyword names"
+  :type '(repeat string)
+  :group 'jinja2)
+
+(defcustom jinja2-user-functions nil
+  "Custom function names"
+  :type '(repeat string)
+  :group 'jinja2)
+
+;; (defcustom jinja2-debug nil
+;;   "Log indentation logic"
+;;   :type 'boolean
+;;   :group 'jinja2)
+
+(defun jinja2-closing-keywords ()
+  (append
+   jinja2-user-keywords
+   '("if" "for" "block" "filter" "with"
+     "raw" "macro" "autoescape" "trans" "call")))
+
+(defun jinja2-indenting-keywords ()
+  (append
+   (jinja2-closing-keywords)
+   '("else" "elif")))
+
+(defun jinja2-builtin-keywords ()
+  '("as" "autoescape" "debug" "extends"
+    "firstof" "in" "include" "load"
+    "now" "regroup" "ssi" "templatetag"
+    "url" "widthratio" "elif" "true"
+    "false" "none" "False" "True" "None"
+    "loop" "super" "caller" "varargs"
+    "kwargs" "break" "continue" "is"
+    "not" "or" "and"
+    "do" "pluralize" "set" "from" "import"
+    "context" "with" "without" "ignore"
+    "missing" "scoped"))
+
+(defun jinja2-functions-keywords ()
+  (append
+   jinja2-user-functions
+   '("abs" "attr" "batch" "capitalize"
+     "center" "default" "dictsort"
+     "escape" "filesizeformat" "first"
+     "float" "forceescape" "format"
+     "groupby" "indent" "int" "join"
+     "last" "length" "list" "lower"
+     "pprint" "random" "replace"
+     "reverse" "round" "safe" "slice"
+     "sort" "string" "striptags" "sum"
+     "title" "trim" "truncate" "upper"
+     "urlize" "wordcount" "wordwrap" "xmlattr")))
+
+(defun jinja2-find-open-tag ()
+  (if (search-backward-regexp
+       (rx-to-string
+        `(and "{%"
+              (? "-")
+              (* whitespace)
+              (? (group
+                  "end"))
+              (group
+               ,(append '(or)
+                        (jinja2-closing-keywords)
+                        ))
+              (group
+               (*? anything))
+              (* whitespace)
+              (? "-")
+              "%}")) nil t)
+      (if (match-string 1) ;; End tag, going on
+          (let ((matches (jinja2-find-open-tag)))
+            (if (string= (car matches) (match-string 2))
+                (jinja2-find-open-tag)
+              (list (match-string 2) (match-string 3))))
+        (list (match-string 2) (match-string 3)))
+    nil))
+
+(defun jinja2-close-tag ()
+  "Close the previously opened template tag."
+  (interactive)
+  (let ((open-tag (save-excursion (jinja2-find-open-tag))))
+    (if open-tag
+        (insert
+         (if (string= (car open-tag) "block")
+             (format "{%% end%s%s %%}"
+                     (car open-tag)(nth 1 open-tag))
+           (format "{%% end%s %%}"
+                   (match-string 2))))
+      (error "Nothing to close")))
+  (save-excursion (jinja2-indent-line)))
+
+(defun jinja2-insert-tag ()
+  "Insert an empty tag"
+  (interactive)
+  (insert "{% ")
+  (save-excursion
+    (insert " %}")
+    (jinja2-indent-line)))
+
+(defun jinja2-insert-var ()
+  "Insert an empty tag"
+  (interactive)
+  (insert "{{ ")
+  (save-excursion
+    (insert " }}")
+    (jinja2-indent-line)))
+
+(defun jinja2-insert-comment ()
+  "Insert an empty tag"
+  (interactive)
+  (insert "{# ")
+  (save-excursion
+    (insert " #}")
+    (jinja2-indent-line)))
+
+(defconst jinja2-font-lock-comments
+  `(
+    (,(rx "{#"
+          (* whitespace)
+          (group
+           (*? anything)
+           )
+          (* whitespace)
+          "#}")
+     . (1 font-lock-comment-face t))))
+
+(defconst jinja2-font-lock-keywords-1
+  (append
+   jinja2-font-lock-comments
+   sgml-font-lock-keywords-1))
+
+(defconst jinja2-font-lock-keywords-2
+  (append
+   jinja2-font-lock-keywords-1
+   sgml-font-lock-keywords-2))
+
+(defconst jinja2-font-lock-keywords-3
+  (append
+   jinja2-font-lock-keywords-1
+   jinja2-font-lock-keywords-2
+   `(
+     (,(rx "{{"
+           (* whitespace)
+           (group
+            (*? anything)
+            )
+           (*
+            "|" (* whitespace) (*? anything))
+           (* whitespace)
+           "}}") (1 font-lock-variable-name-face t))
+     (,(rx  (group "|" (* whitespace))
+            (group (+ word))
+            )
+      (1 font-lock-keyword-face t)
+      (2 font-lock-warning-face t))
+     (,(rx-to-string `(and (group "|" (* whitespace))
+                           (group
+                            ,(append '(or)
+                                     (jinja2-functions-keywords)
+                                     ))))
+      (1 font-lock-keyword-face t)
+      (2 font-lock-function-name-face t)
+      )
+     (,(rx-to-string `(and word-start
+                           (? "end")
+                           ,(append '(or)
+                                    (jinja2-indenting-keywords)
+                                    )
+                           word-end)) (0 font-lock-keyword-face))
+     (,(rx-to-string `(and word-start
+                           ,(append '(or)
+                                    (jinja2-builtin-keywords)
+                                    )
+                           word-end)) (0 font-lock-builtin-face))
+
+     (,(rx (or "{%" "%}" "{%-" "-%}")) (0 font-lock-function-name-face t))
+     (,(rx (or "{{" "}}")) (0 font-lock-type-face t))
+     (,(rx "{#"
+           (* whitespace)
+           (group
+            (*? anything)
+            )
+           (* whitespace)
+           "#}")
+      (1 font-lock-comment-face t))
+     (,(rx (or "{#" "#}")) (0 font-lock-comment-delimiter-face t))
+     )))
+
+(defvar jinja2-font-lock-keywords
+  jinja2-font-lock-keywords-1)
+
+(defun sgml-indent-line-num ()
+  "Indent the current line as SGML."
+  (let* ((savep (point))
+         (indent-col
+          (save-excursion
+            (back-to-indentation)
+            (if (>= (point) savep) (setq savep nil))
+            (sgml-calculate-indent))))
+    (if (null indent-col)
+        0
+      (if savep
+          (save-excursion indent-col)
+        indent-col))))
+
+(defun jinja2-calculate-indent-backward (default)
+  "Return indent column based on previous lines"
+  (let ((indent-width sgml-basic-offset) (default (sgml-indent-line-num)))
+    (forward-line -1)
+    (if (looking-at "^[ \t]*{%-? *end") ; Don't indent after end
+        (current-indentation)
+      (if (looking-at (concat "^[ \t]*{%-? *.*?{%-? *end" (regexp-opt (jinja2-indenting-keywords))))
+          (current-indentation)
+        (if (looking-at (concat "^[ \t]*{%-? *" (regexp-opt (jinja2-indenting-keywords)))) ; Check start tag
+            (+ (current-indentation) indent-width)
+          (if (looking-at "^[ \t]*<") ; Assume sgml block trust sgml
+              default
+            (if (bobp)
+                0
+              (jinja2-calculate-indent-backward default))))))))
+
+
+(defun jinja2-calculate-indent ()
+  "Return indent column"
+  (if (bobp)  ; Check begining of buffer
+      0
+    (let ((indent-width sgml-basic-offset) (default (sgml-indent-line-num)))
+      (if (looking-at "^[ \t]*{%-? *e\\(nd\\|lse\\|lif\\)") ; Check close tag
+          (save-excursion
+            (forward-line -1)
+            (if
+                (and
+                 (looking-at (concat "^[ \t]*{%-? *" (regexp-opt (jinja2-indenting-keywords))))
+                 (not (looking-at (concat "^[ \t]*{%-? *.*?{% *end" (regexp-opt (jinja2-indenting-keywords))))))
+                (current-indentation)
+              (- (current-indentation) indent-width)))
+        (if (looking-at "^[ \t]*</") ; Assume sgml end block trust sgml
+            default
+          (save-excursion
+            (jinja2-calculate-indent-backward default)))))))
+
+(defun jinja2-indent-line ()
+  "Indent current line as Jinja code"
+  (interactive)
+  (let ((old_indent (current-indentation)) (old_point (point)))
+    (move-beginning-of-line nil)
+    (let ((indent (max 0 (jinja2-calculate-indent))))
+      (indent-line-to indent)
+      (if (< old_indent (- old_point (line-beginning-position)))
+          (goto-char (+ (- indent old_indent) old_point)))
+      indent)))
+
+
+;;;###autoload
+(define-derived-mode jinja2-mode html-mode  "Jinja2"
+  "Major mode for editing jinja2 files"
+  :group 'jinja2
+  ;; Disabling this because of this emacs bug: 
+  ;;  http://lists.gnu.org/archive/html/bug-gnu-emacs/2002-09/msg00041.html
+  ;; (modify-syntax-entry ?\'  "\"" sgml-mode-syntax-table)
+  (set (make-local-variable 'comment-start) "{#")
+  (set (make-local-variable 'comment-start-skip) "{#")
+  (set (make-local-variable 'comment-end) "#}")
+  (set (make-local-variable 'comment-end-skip) "#}")
+  ;; it mainly from sgml-mode font lock setting
+  (set (make-local-variable 'font-lock-defaults)
+       '((
+          jinja2-font-lock-keywords
+          jinja2-font-lock-keywords-1
+          jinja2-font-lock-keywords-2
+          jinja2-font-lock-keywords-3)
+         nil t nil nil
+         (font-lock-syntactic-keywords
+          . sgml-font-lock-syntactic-keywords)))
+  (set (make-local-variable 'indent-line-function) 'jinja2-indent-line))
+
+(define-key jinja2-mode-map (kbd "C-c c") 'jinja2-close-tag)
+(define-key jinja2-mode-map (kbd "C-c t") 'jinja2-insert-tag)
+(define-key jinja2-mode-map (kbd "C-c v") 'jinja2-insert-var)
+(define-key jinja2-mode-map (kbd "C-c #") 'jinja2-insert-comment)
+
+;;;###autoload
+(add-to-list 'auto-mode-alist '("\\.jinja2\\'" . jinja2-mode))
+
+(provide 'jinja2-mode)
+
+;;; jinja2-mode.el ends here
diff --git a/elpa/masm-mode-20200308.1450/masm-mode-autoloads.el b/elpa/masm-mode-20200308.1450/masm-mode-autoloads.el
new file mode 100644
index 0000000..67ce2b9
--- /dev/null
+++ b/elpa/masm-mode-20200308.1450/masm-mode-autoloads.el
@@ -0,0 +1,31 @@
+;;; masm-mode-autoloads.el --- automatically extracted autoloads
+;;
+;;; Code:
+
+(add-to-list 'load-path (directory-file-name
+                         (or (file-name-directory #$) (car load-path))))
+
+
+;;;### (autoloads nil "masm-mode" "masm-mode.el" (0 0 0 0))
+;;; Generated autoloads from masm-mode.el
+
+(autoload 'masm-mode "masm-mode" "\
+Major mode for editing MASM assembly programs.
+
+\(fn)" t nil)
+
+(add-to-list 'auto-mode-alist '("\\.asm\\'" . masm-mode))
+
+(add-to-list 'auto-mode-alist '("\\.inc\\'" . masm-mode))
+
+(if (fboundp 'register-definition-prefixes) (register-definition-prefixes "masm-mode" '("masm-")))
+
+;;;***
+
+;; Local Variables:
+;; version-control: never
+;; no-byte-compile: t
+;; no-update-autoloads: t
+;; coding: utf-8
+;; End:
+;;; masm-mode-autoloads.el ends here
diff --git a/elpa/masm-mode-20200308.1450/masm-mode-pkg.el b/elpa/masm-mode-20200308.1450/masm-mode-pkg.el
new file mode 100644
index 0000000..c88e937
--- /dev/null
+++ b/elpa/masm-mode-20200308.1450/masm-mode-pkg.el
@@ -0,0 +1,2 @@
+;;; Generated package description from masm-mode.el  -*- no-byte-compile: t -*-
+(define-package "masm-mode" "20200308.1450" "MASM x86 and x64 assembly major mode" '((emacs "25.1")) :commit "626b9255c2bb967a53d1d50be0b98a1bcae3250c" :authors '(("YiGeeker" . "zyfchinese@yeah.net")) :maintainer '("YiGeeker" . "zyfchinese@yeah.net") :keywords '("languages") :url "https://github.com/YiGeeker/masm-mode")
diff --git a/elpa/masm-mode-20200308.1450/masm-mode.el b/elpa/masm-mode-20200308.1450/masm-mode.el
new file mode 100644
index 0000000..42c1b37
--- /dev/null
+++ b/elpa/masm-mode-20200308.1450/masm-mode.el
@@ -0,0 +1,737 @@
+;;; masm-mode.el --- MASM x86 and x64 assembly major mode -*- lexical-binding: t; -*-
+
+;; This is free and unencumbered software released into the public domain.
+
+;; Author: YiGeeker <zyfchinese@yeah.net>
+;; Version: 1.0.0
+;; Package-Version: 20200308.1450
+;; Package-Commit: 626b9255c2bb967a53d1d50be0b98a1bcae3250c
+;; Package-Requires: ((emacs "25.1"))
+;; Keywords: languages
+;; URL: https://github.com/YiGeeker/masm-mode
+
+;; This file is NOT part of GNU Emacs.
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of GNU General Public License.
+
+;;; Commentary:
+
+;; A major mode for editing MASM x86 and x64 assembly code. It
+;; includes syntax highlighting, automatic comment indentation and
+;; various build commands.
+;; Notice: masm-mode will clobber Emacs's built-in asm-mode.
+
+;;; Code:
+
+(defgroup masm nil
+  "Options for `masm-mode'."
+  :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
+  :group 'languages)
+
+(defcustom masm-program-win64 t
+  "Syntax for `masm-mode', t for Win64 and nil for Win32."
+  :type '(choice (const :tag "Win64" t)
+                 (const :tag "Win32" nil))
+  :group 'masm-mode)
+
+(defcustom masm-win32-compile-args '("/c" "/coff")
+  "Default arguments for the ml.exe in `masm-mode'."
+  :type '(repeat string)
+  :group 'masm-mode)
+
+(defcustom masm-win32-link-args '("/subsystem:windows")
+  "Default arguments for the Win32 link.exe in `masm-mode'."
+  :type '(repeat string)
+  :group 'masm-mode)
+
+(defcustom masm-win32-executable-path ""
+  "Path for ml.exe."
+  :type 'directory
+  :group 'masm-mode)
+
+(defcustom masm-win32-include-path ()
+  "Path for Win32 inc files in `masm-mode'."
+  :type '(repeat directory)
+  :group 'masm-mode)
+
+(defcustom masm-win32-library-path ()
+  "Path for Win32 lib files in `masm-mode'."
+  :type '(repeat directory)
+  :group 'masm-mode)
+
+(defcustom masm-win64-compile-args '("/c")
+  "Default arguments for the ml64.exe in `masm-mode'."
+  :type '(repeat string)
+  :group 'masm-mode)
+
+(defcustom masm-win64-link-args '("/subsystem:windows" "/machine:x64" "/entry:main")
+  "Default arguments for the Win64 link.exe in `masm-mode'."
+  :type '(repeat string)
+  :group 'masm-mode)
+
+(defcustom masm-win64-executable-path ""
+  "Path for ml64.exe."
+  :type 'directory
+  :group 'masm-mode)
+
+(defcustom masm-win64-include-path ()
+  "Path for Win64 inc files in `masm-mode'."
+  :type '(repeat directory)
+  :group 'masm-mode)
+
+(defcustom masm-win64-library-path ()
+  "Path for Win64 lib files in `masm-mode'."
+  :type '(repeat directory)
+  :group 'masm-mode)
+
+(defcustom masm-build-executable "nmake"
+  "Default executable for building the assembly project in `masm-mode'."
+  :type 'string
+  :group 'masm-mode)
+
+(defcustom masm-build-args ()
+  "Default arguments for the build command in `masm-mode'."
+  :type '(repeat string)
+  :group 'masm-mode)
+
+(defvar-local masm--program-win64
+  masm-program-win64
+  "Decided by customizable value.")
+
+(defvar-local masm--compile-command-used nil
+  "Save changed compile command.")
+
+(defvar-local masm--link-command-used nil
+  "Save changed link command.")
+
+(defvar-local masm--build-command-used nil
+  "Save changed build command.")
+
+(defgroup masm-mode-faces ()
+  "Faces used by `masm-mode'."
+  :group 'masm-mode)
+
+(defvar masm-mode-abbrev-table nil
+  "Abbrev table used while in `masm-mode'.")
+(define-abbrev-table 'masm-mode-abbrev-table ())
+
+(defface masm-registers
+  '((t :inherit (font-lock-variable-name-face)))
+  "Face for registers."
+  :group 'masm-mode-faces)
+
+(defface masm-prefix
+  '((t :inherit (font-lock-builtin-face)))
+  "Face for prefix."
+  :group 'masm-mode-faces)
+
+(defface masm-types
+  '((t :inherit (font-lock-type-face)))
+  "Face for types."
+  :group 'masm-mode-faces)
+
+(defface masm-instructions
+  '((t :inherit (font-lock-builtin-face)))
+  "Face for instructions."
+  :group 'masm-mode-faces)
+
+(defface masm-directives
+  '((t :inherit (font-lock-keyword-face)))
+  "Face for directives."
+  :group 'masm-mode-faces)
+
+(defface masm-labels
+  '((t :inherit (font-lock-function-name-face)))
+  "Face for labels."
+  :group 'masm-mode-faces)
+
+(defface masm-subprogram
+  '((t :inherit (font-lock-function-name-face)))
+  "Face for subprogram."
+  :group 'masm-mode-faces)
+
+(defface masm-macro
+  '((t :inherit (font-lock-function-name-face)))
+  "Face for macro."
+  :group 'masm-mode-faces)
+
+(defface masm-section-name
+  '((t :inherit (font-lock-type-face)))
+  "Face for section name."
+  :group 'masm-mode-faces)
+
+(defface masm-constant
+  '((t :inherit (font-lock-constant-face)))
+  "Face for constant."
+  :group 'masm-mode-faces)
+
+(defface masm-struct
+  '((t :inherit (font-lock-type-face)))
+  "Face for struct."
+  :group 'masm-mode-faces)
+
+(defface masm-union
+  '((t :inherit (font-lock-type-face)))
+  "Face for union."
+  :group 'masm-mode-faces)
+
+(eval-and-compile
+  (defconst masm-registers-common
+    '("ah" "al" "ax" "bh" "bl" "bp" "bx" "ch" "cl" "cr0" "cr2" "cr3"
+      "cs" "cx" "dh" "di" "dl" "dr0" "dr1" "dr2" "dr3" "dr6" "dr7"
+      "ds" "dx" "eax" "ebp" "ebx" "ecx" "edi" "edx" "eip" "es" "esi"
+      "esp" "fpr0" "fpr1" "fpr2" "fpr3" "fpr4" "fpr5" "fpr6" "fpr7"
+      "fs" "gs" "ip" "mmx0" "mmx1" "mmx2" "mmx3" "mmx4" "mmx5" "mmx6"
+      "mmx7" "si" "sp" "ss" "st" "tr3" "tr4" "tr5" "tr6" "tr7" )
+    "MASM registers for `masm-mode'."))
+
+
+(eval-and-compile
+  (defconst masm-registers-win64-only
+    '( "r10" "r10b" "r10d" "r10w" "r11" "r11b" "r11d" "r11w" "r12"
+       "r12b" "r12d" "r12w" "r13" "r13b" "r13d" "r13w" "r14" "r14b"
+       "r14d" "r14w" "r15" "r15b" "r15d" "r15w" "r8" "r8b" "r8d" "r8w"
+       "r9" "r9b" "r9d" "r9w" "rax" "rbp" "rbx" "rcx" "rdi" "rdx" "rip"
+       "rsi" "rsp" "xmm0" "xmm1" "xmm10" "xmm11" "xmm12" "xmm13"
+       "xmm14" "xmm15" "xmm2" "xmm3" "xmm4" "xmm5" "xmm6" "xmm7" "xmm8"
+       "xmm9")
+    "MASM win64 registers for `masm-mode'."))
+
+(eval-and-compile
+  (defconst masm-instructions-common
+    '("aaa" "aad" "aam" "aas" "adc" "adcx" "add" "addpd" "addps"
+      "addsd" "addss" "addsubpd" "addsubps" "adox" "aesdec"
+      "aesdeclast" "aesenc" "aesenclast" "aesimc" "aeskeygenassist"
+      "and" "andn" "andnpd" "andnps" "andpd" "andps" "arpl" "bound"
+      "bsf" "bsr" "bswap" "bt" "btc" "btr" "bts" "call" "clc" "cld"
+      "cli" "clts" "cmp" "cmps" "cmpsb" "cmpsw" "cmpxchg" "cwd" "daa"
+      "das" "dec" "div" "enter" "esc" "f2xm1" "fabs" "fadd" "faddp"
+      "fbld" "fbstp" "fchs" "fclex" "fcom" "fcomp" "fcompp" "fcos"
+      "fdecstp" "fdisi" "fdiv" "fdivp" "fdivr" "fdivrp" "feni" "ffree"
+      "fiadd" "ficom" "ficomp" "fidiv" "fidivr" "fild" "fimul"
+      "fincstp" "finit" "fist" "fistp" "fisub" "fisubr" "fld" "fld1"
+      "fldcw" "fldenv" "fldenvd" "fldenvw" "fldl2e" "fldl2t" "fldlg2"
+      "fldln2" "fldpi" "fldz" "fmul" "fmulp" "fnclex" "fndisi" "fneni"
+      "fninit" "fnop" "fnsave" "fnsaved" "fnsavew" "fnstcw" "fnstenv"
+      "fnstenvd" "fnstenvw" "fnstsw" "fpatan" "fprem" "fprem1" "fptan"
+      "frndint" "frstor" "frstord" "frstorw" "fsave" "fsaved" "fsavew"
+      "fscale" "fsetpm" "fsin" "fincos" "fsqrt" "fst" "fstcw" "fstenv"
+      "fstenvd" "fstenvw" "fstp" "fstsw" "fsub" "fsubp" "fsubr"
+      "fsubrp" "ftst" "fucom" "fucomp" "fucompp" "fwait" "fxam" "fxch"
+      "fxtract" "fyl2x" "fyl2xp1" "hlt" "idiv" "imul" "in" "inc" "ins"
+      "insb" "insd" "insw" "int" "into" "invd" "invlpg" "iret" "iretd"
+      "iretdf" "iretf" "ja" "jae" "jb" "jbe" "jc" "jcxz" "je" "jecxz"
+      "jg" "jge" "jl" "jle" "jmp" "jna" "jnae" "jnb" "jnbe" "jnc"
+      "jne" "jng" "jnge" "jnl" "jnle" "jno" "jnp" "jns" "jnz" "jo"
+      "jp" "jpe" "jpo" "js" "jz" "lahf" "lar" "lds" "lea" "leave"
+      "les" "lfs" "lgdt" "lgs" "lidt" "lldt" "lmsw" "lods" "lodsb"
+      "lodsd" "lodsw" "loop" "loopd" "loope" "looped" "loopew"
+      "loopne" "loopned" "loopnz" "loopnzd" "loopnzw" "loopw" "loopz"
+      "loopzd" "loopzw" "lsl" "lss" "ltr" "mov" "movapd" "movaps"
+      "movbe" "movd" "movddup" "movdq2q" "movdqa" "movdqu" "movhlps"
+      "movhpd" "movhps" "movlhps" "movlpd" "movlps" "movmskpd"
+      "movmskps" "movntdq" "movntdqa" "movnti" "movntpd" "movntps"
+      "movntq" "movntsd" "movntss" "movq" "movq2dq" "movs" "movsb"
+      "movsd" "movsx" "movsw" "movzx" "mul" "nop" "not" "or" "out"
+      "outs" "outsb" "outsd" "outsw" "pabsb" "pabsd" "pabsw"
+      "packssdw" "packsswb" "packusdw" "packuswb" "paddb" "paddd"
+      "paddq" "paddsb" "paddsiw" "paddsw" "paddusb" "paddusw" "paddw"
+      "palignr" "pand" "pandn" "pause" "paveb" "pavgb" "pavgusb"
+      "pavgw" "pblendvb" "pblendw" "pclmulhqhqdq" "pclmulhqlqdq"
+      "pclmullqhqdq" "pclmullqlqdq" "pclmulqdq" "pcmpeqb" "pcmpeqd"
+      "pcmpeqq" "pcmpeqw" "pcmpestri" "pcmpestrm" "pcmpgtb" "pcmpgtd"
+      "pcmpgtq" "pcmpgtw" "pcmpistri" "pcmpistrm" "pdep" "pdistib"
+      "pext" "pextrb" "pextrd" "pextrq" "pextrw" "pf2id" "pf2iw"
+      "pfacc" "pfadd" "pfcmpeq" "pfcmpge" "pfcmpgt" "pfmax" "pfmin"
+      "pfmul" "pfnacc" "pfpnacc" "pfrcp" "pfrcpit1" "pfrcpit2"
+      "pfrcpv" "pfrsqit1" "pfrsqrt" "pfrsqrtv" "pfsub" "pfsubr"
+      "phaddd" "phaddsw" "phaddw" "phminposuw" "phsubd" "phsubsw"
+      "phsubw" "pi2fd" "pi2fw" "pinsrb" "pinsrd" "pinsrq" "pinsrw"
+      "pmachriw" "pmaddubsw" "pmaddwd" "pmagw" "pmaxsb" "pmaxsd"
+      "pmaxsw" "pmaxub" "pmaxud" "pmaxuw" "pminsb" "pminsd" "pminsw"
+      "pminub" "pminud" "pminuw" "pmovmskb" "pmovsxbd" "pmovsxbq"
+      "pmovsxbw" "pmovsxdq" "pmovsxwd" "pmovsxwq" "pmovzxbd"
+      "pmovzxbq" "pmovzxbw" "pmovzxdq" "pmovzxwd" "pmovzxwq" "pmuldq"
+      "pmulhriw" "pmulhrsw" "pmulhrwa" "pmulhrwc" "pmulhuw" "pmulhw"
+      "pmulld" "pmullw" "pmuludq" "pmvgezb" "pmvlzb" "pmvnzb" "pmvzb"
+      "pop" "popa" "popf" "popfd" "push" "pusha" "pushd" "pushf"
+      "pushfd" "pushw" "rcl" "rcr" "ret" "retf" "retn" "rol" "ror"
+      "sahf" "sal" "sar" "sbb" "scas" "scasb" "scasd" "scasw" "seta"
+      "setae" "setb" "setbe" "setc" "sete" "setg" "setge" "setl"
+      "setle" "setna" "setnae" "setnb" "setnbe" "setnc" "setne"
+      "setng" "setnge" "setnl" "setnle" "setno" "setnp" "setns"
+      "setnz" "seto" "setp" "setpe" "setpo" "sets" "setz" "shld" "shl"
+      "shld" "shr" "shrd" "sidt" "sldt" "smsw" "stc" "std" "sti" "str"
+      "stos" "stosb" "stosd" "stosw" "sub" "test" "verr" "verw"
+      "wbinvd" "xadd" "xchg" "xlat" "xlatb" "xor")
+    "MASM instructions for `masm-mode'."))
+
+(eval-and-compile
+  (defconst masm-instructions-win32-only
+    '("pushad" "popad")
+    "MASM Win32 instructions for `masm-mode'."))
+
+(eval-and-compile
+  (defconst masm-section-name
+    '(".code" ".const" ".data" ".data?" ".stack")
+    "MASM section names for `masm-mode'."))
+
+(eval-and-compile
+  (defconst masm-types
+    '("byte" "dword" "fword" "qword" "Real4" "Real8" "Real10" "sbyte"
+      "sdword" "sword" "tbyte" "word")
+    "MASM types for `masm-mode'."))
+
+(eval-and-compile
+  (defconst masm-prefix
+    '("lock" "rep" "repe" "repne" "repnz" "repz")
+    "MASM prefixes for `masm-mode'."))
+
+(eval-and-compile
+  (defconst masm-directives-win32-only
+    '(".186" ".286" ".286c" ".286p" ".287" ".386" ".386c" ".386p"
+      ".387" ".486" ".486p" ".8086" ".8087" ".alpha" ".break"
+      ".continue" ".cref" ".dosseg" ".else" ".elseif" ".endif" ".endw"
+      ".err" ".err1" ".err2" ".errb" ".errdef" ".errdif" ".errdifi"
+      ".erre" ".erridn" ".erridni" ".errnb" ".errndef" ".errnz"
+      ".exit" ".fardata" ".fardata?" ".if" ".lall" ".lfcond" ".list"
+      ".listall" ".listif" ".listmacro" ".listmacroall" ".mmx"
+      ".model" ".msfloat" ".no87" ".nocref" ".nolist" ".nolistif"
+      ".nolistmacro" ".radix"".repeat" ".sall" ".seq" ".sfcond"
+      ".startup" ".tfcond" ".type" ".until" ".untilcxz" ".while"
+      ".xall" ".xcref" ".xlist" "%out" "carry?" "invoke" "overflow?"
+      "parity?" "sign?" "zero?")
+    "MASM win32 directives for `masm-mode'."))
+
+(eval-and-compile
+  (defconst masm-directives-common
+    '("alias" "align" "assume" "catstr" "comm" "comment" "db" "dd"
+      "df" "dosseg" "dq" "dt" "dup" "dw" "echo" "else" "elseif"
+      "elseif1" "elseif2" "elseifb" "elseifdef" "elseifdif"
+      "elseifdifi" "elseife" "elseifidn" "elseifidni" "elseifnb"
+      "elseifndef" "end" "endif" "endm" "endp" "ends" "eq" "equ"
+      "even" "exitm" "extern" "externdef" "extrn" "for" "forc""ge"
+      "goto" "group" "gt" "high" "highword" "if" "if1" "if2" "ifb"
+      "ifdef" "ifdif" "ifdifi" "ife" "ifidn" "ifidni" "ifnb" "ifndef"
+      "include" "includelib" "instr" "irp" "irpc" "label" "le"
+      "length" "lengthof" "local" "low" "lowword" "lroffset" "lt"
+      "macro" "mask" "mod" "name" "ne" "offset" "opattr" "option"
+      "org" "page" "popcontext" "proc" "proto" "ptr" "public" "purge"
+      "pushcontext" "record" "repeat" "rept" "seg" "segment" "short"
+      "size" "sizeof" "sizestr" "struc" "struct" "substr" "subtitle"
+      "subttl" "textequ" "this" "title" "type" "typedef" "union" "uses"
+      "while")
+    "MASM directives for `masm-mode'."))
+
+(defconst masm-label-regexp
+  "\\(\\_<[a-zA-Z_@][a-zA-Z0-9_@?]*\\_>\\):\\s-*"
+  "Regexp for `masm-mode' for matching labels.")
+
+(defconst masm-subprogram-regexp
+  "\\(\\_<[a-zA-Z_@]+\\_>\\)[ \t]+\\(proc\\|endp\\)\\s-*"
+  "Regexp for `masm-mode' for matching subprogram.")
+
+(defconst masm-constant-regexp
+  "\\<[-+]?\\([0-9]+[Dd]?\\|[01]+[Bb]\\|[0-7]+[Qq]\\|[0-9A-Fa-f]+[Hh]\\)\\([-+]\\([0-9]+[Dd]?\\|[01]+[Bb]\\|[0-7]+[Qq]\\|[0-9A-Fa-f]+[Hh]\\)\\)*\\>"
+  "Regexp for `masm-mode' for matching numeric constants.")
+
+(defconst masm-struct-regexp
+  "\\(\\_<[a-zA-Z_@]+\\_>\\)[ \t]+\\(struct\\|ends\\)\\s-*"
+  "Regexp for `masm-mode' for matching struct.")
+
+(defconst masm-union-regexp
+  "\\(\\_<[a-zA-Z_@]+\\_>\\)[ \t]+\\(union\\|ends\\)\\s-*"
+  "Regexp for `masm-mode' for matching struct.")
+
+(defconst masm-macro-regexp
+  "\\(\\_<[a-zA-Z_@]+\\_>\\)[ \t]+macro\\s-*"
+  "Regexp for `masm-mode' for matching macro.")
+
+(defmacro masm--opt (keywords)
+  "Prepare KEYWORDS for `looking-at'."
+  `(eval-when-compile
+     (regexp-opt ,keywords 'words)))
+
+(defconst masm-imenu-generic-expression
+  `((nil ,(concat "^\\s-*" masm-label-regexp) 1)
+    (nil ,(concat "\\(\\_<[a-zA-Z_@]+\\_>\\)[ \t]+"
+                  (masm--opt '("proc" "macro")))
+         1))
+  "Expressions for `imenu-generic-expression'.")
+
+(defconst masm-win32-font-lock-keywords
+  `((,(masm--opt masm-section-name) . 'masm-section-name)
+    (,(masm--opt masm-registers-common) . 'masm-registers)
+    (,(masm--opt masm-types) . 'masm-types)
+    (,(masm--opt masm-instructions-common) . 'masm-instructions)
+    (,(masm--opt masm-instructions-win32-only) . 'masm-instructions)
+    (,(masm--opt masm-prefix) . 'masm-prefix)
+    (,masm-label-regexp (1 'masm-labels))
+    (,masm-subprogram-regexp (1 'masm-subprogram))
+    (,masm-constant-regexp . 'masm-constant)
+    (,masm-struct-regexp (1 'masm-struct))
+    (,masm-union-regexp (1 'masm-union))
+    (,masm-macro-regexp (1 'masm-macro))
+    (,(masm--opt masm-directives-common) . 'masm-directives)
+    (,(masm--opt masm-directives-win32-only) . 'masm-directives))
+  "Win32 keywords for `masm-mode'.")
+
+(defconst masm-win64-font-lock-keywords
+  `((,(masm--opt masm-section-name) . 'masm-section-name)
+    (,(masm--opt masm-registers-common) . 'masm-registers)
+    (,(masm--opt masm-registers-win64-only) . 'masm-registers)
+    (,(masm--opt masm-types) . 'masm-types)
+    (,(masm--opt masm-instructions-common) . 'masm-instructions)
+    (,(masm--opt masm-prefix) . 'masm-prefix)
+    (,masm-label-regexp (1 'masm-labels))
+    (,masm-subprogram-regexp (1 'masm-subprogram))
+    (,masm-constant-regexp . 'masm-constant)
+    (,masm-struct-regexp (1 'masm-struct))
+    (,masm-union-regexp (1 'masm-union))
+    (,masm-macro-regexp (1 'masm-macro))
+    (,(masm--opt masm-directives-common) . 'masm-directives))
+  "Win64 keywords for `masm-mode'.")
+
+(defconst masm-mode-syntax-table
+  (with-syntax-table (copy-syntax-table)
+    (modify-syntax-entry ?_  "w")
+    (modify-syntax-entry ?@  "w")
+    (modify-syntax-entry ?\? "w")
+    (modify-syntax-entry ?\. "w")
+    (modify-syntax-entry ?\; "<")
+    (modify-syntax-entry ?\n ">")
+    (modify-syntax-entry ?\" "\"")
+    (modify-syntax-entry ?\' "\"")
+    (syntax-table))
+  "Syntax table for `masm-mode'.")
+
+(defvar masm-mode-map
+  (let ((map (make-sparse-keymap)))
+    ;; Note that the comment character isn't set up until masm-mode is called.
+    (define-key map ":"        #'masm-colon)
+    (define-key map "\C-c;"    #'comment-region)
+    (define-key map ";"        #'masm-comment)
+    (define-key map "\C-j"     #'masm-newline-and-indent)
+    (define-key map "\C-m"     #'masm-newline-and-indent)
+    (define-key map "\C-c\C-c" #'masm-build)
+    (define-key map "\C-c\C-b" #'masm-compile)
+    (define-key map "\C-c\C-l" #'masm-link)
+    (define-key map "\C-c\C-s" #'masm-change-program-type)
+    (define-key map [menu-bar masm-mode] (cons "Masm" (make-sparse-keymap)))
+
+    (define-key map [menu-bar masm-mode newline-and-indent]
+      '(menu-item "Insert Newline and Indent" masm-newline-and-indent
+                  :help "Insert a newline, then indent according to major mode"))
+    (define-key map [menu-bar masm-mode masm-colon]
+      '(menu-item "Insert Colon" masm-colon
+                  :help "Insert a colon; if it follows a label, delete the label's indentation"))
+    (define-key map [menu-bar masm-mode masm-change-program-type]
+      '(menu-item "Switch program type" masm-change-program-type
+                  :help "Switch between Win32 and Win64"))
+    (define-key map [menu-bar masm-mode masm-link]
+      '(menu-item "Link the obj file" masm-link
+                  :help "Use link to link the obj file"))
+    (define-key map [menu-bar masm-mode masm-compile]
+      '(menu-item "Compile the file" masm-compile
+                  :help "Use ml64 to compile the file"))
+    (define-key map [menu-bar masm-mode masm-build]
+      '(menu-item "Build the project" masm-build
+                  :help "Use nmake to build the project"))
+    (define-key map [menu-bar masm-mode comment-region]
+      '(menu-item "Comment Region" comment-region
+                  :help "Comment or uncomment each line in the region"))
+    map)
+  "Keymap for masm mode.")
+
+(defun masm-colon ()
+  "Insert a colon and convert the current line into a label."
+  (interactive)
+  (call-interactively #'self-insert-command)
+  (save-excursion
+    (back-to-indentation)
+    (delete-horizontal-space)))
+
+(defun masm-newline-and-indent ()
+  "Auto-indent the new line."
+  (interactive)
+  (let ((indent
+         (save-excursion
+           (back-to-indentation)
+           (current-column)))
+        (col (current-column)))
+    (newline-and-indent)
+    (if (eql indent col)
+        (indent-line-to indent))))
+
+(defun masm--current-line ()
+  "Return the current line as a string."
+  (save-excursion
+    (let ((start (line-beginning-position))
+          (end (line-end-position)))
+      (buffer-substring-no-properties start end))))
+
+(defun masm--empty-line-p ()
+  "Return non-nil if current line has non-whitespace."
+  (not (string-match-p "\\S-" (masm--current-line))))
+
+(defun masm--line-has-comment-p ()
+  "Return non-nil if current line contain a comment."
+  (save-excursion
+    (end-of-line)
+    (nth 4 (syntax-ppss))))
+
+(defun masm--line-has-non-comment-p ()
+  "Return non-nil of the current line has code."
+  (let* ((line (masm--current-line))
+         (match (string-match-p "\\S-" line)))
+    (when match
+      (not (eql ?\; (aref line match))))))
+
+(defun masm--inside-indentation-p ()
+  "Return non-nil if point is within the indentation."
+  (save-excursion
+    (let ((point (point))
+          (start (line-beginning-position))
+          (end (save-excursion (back-to-indentation) (point))))
+      (and (<= start point) (<= point end)))))
+
+(defun masm-insert-comment ()
+  "Insert a comment if the current line doesn’t contain one."
+  (let ((comment-insert-comment-function nil))
+    (if (or (masm--empty-line-p) (nth 3 (syntax-ppss)))
+        (progn
+          (indent-line-to 0)
+          (insert ";"))
+      (comment-indent))))
+
+(defun masm-comment (&optional arg)
+  "Begin or edit a comment with context-sensitive placement.
+
+The right-hand comment gutter is far away from the code, so this
+command uses the mark ring to help move back and forth between
+code and the comment gutter.
+
+* If no comment gutter exists yet, mark the current position and
+  jump to it.
+* If already within the gutter, pop the top mark and return to
+  the code.
+* If on a line with no code, just insert a comment character.
+* If within the indentation, just insert a comment character.
+  This is intended prevent interference when the intention is to
+  comment out the line.
+
+With a prefix ARG, kill the comment on the current line with
+`comment-kill'."
+  (interactive "p")
+  (if (not (eql arg 1))
+      (comment-kill nil)
+    (cond
+     ;; Empty line, or inside a string? Insert.
+     ((or (masm--empty-line-p) (nth 3 (syntax-ppss)))
+      (indent-line-to 0)
+      (insert ";"))
+     ;; Inside the indentation? Comment out the line.
+     ((masm--inside-indentation-p)
+      (insert ";"))
+     ;; Currently in a right-side comment? Return.
+     ((and (masm--line-has-comment-p)
+           (masm--line-has-non-comment-p)
+           (nth 4 (syntax-ppss)))
+      (setf (point) (mark))
+      (pop-mark))
+     ;; Line has code? Mark and jump to right-side comment.
+     ((masm--line-has-non-comment-p)
+      (push-mark)
+      (comment-indent))
+     ;; Otherwise insert.
+     ((insert ";")))))
+
+(defun masm-compile (_savep command)
+  "Compile COMMAND in `masm-mode'."
+  (interactive
+   (list (if (buffer-modified-p)
+             (let ((savep (y-or-n-p (format "Buffer %s modified; Save it before compile? " (current-buffer)))))
+               (if savep
+                   (save-buffer))))
+         (if masm--compile-command-used
+             (read-shell-command "Compile command: " masm--compile-command-used)
+           (let ((command (if masm--program-win64
+                              (concat
+                               "ml64 "
+                               (mapconcat (lambda (str) str) masm-win64-compile-args " ")
+                               " "
+                               (file-name-nondirectory buffer-file-name))
+                            (concat
+                             "ml "
+                             (mapconcat (lambda (str) str) masm-win32-compile-args " ")
+                             " "
+                             (file-name-nondirectory buffer-file-name)))))
+             (read-shell-command "Compile command: " command)))))
+  (setq masm--compile-command-used command)
+  (if masm--program-win64
+      (let ((process-environment
+             (append
+              (list
+               (concat "PATH=" masm-win64-executable-path ";"
+                       (getenv "path"))
+               (concat "INCLUDE=" (mapconcat #'file-name-as-directory masm-win64-include-path ";")
+                       (getenv "include"))
+               (concat "LIB=" (mapconcat #'file-name-as-directory masm-win64-library-path ";")
+                       (getenv "lib")))
+              process-environment)))
+        (compilation-start
+         command nil (lambda (_maj-mode)
+                       "*masm x64 compile*")))
+    (let ((process-environment
+           (append
+            (list
+             (concat "PATH=" masm-win32-executable-path ";"
+                     (getenv "path"))
+             (concat "INCLUDE=" (mapconcat #'file-name-as-directory masm-win32-include-path ";")
+                     (getenv "include"))
+             (concat "LIB=" (mapconcat #'file-name-as-directory masm-win32-library-path ";")
+                     (getenv "lib")))
+            process-environment)))
+      (compilation-start
+       command nil (lambda (_maj-mode)
+                     "*masm x86 compile*")))))
+
+
+(defun masm-link (command)
+  "Compile COMMAND in `masm-mode'."
+  (interactive
+   (list (if masm--link-command-used
+             (read-shell-command "Link command: " masm--link-command-used)
+           (let ((command (concat
+                           "link "
+                           (mapconcat (lambda (str) str) (if masm--program-win64 masm-win64-link-args masm-win32-link-args) " ")
+                           " "
+                           (file-name-base buffer-file-name)
+                           ".obj")))
+             (read-shell-command "Link command: " command)))))
+  (setq masm--link-command-used command)
+  (if masm--program-win64
+      (let ((process-environment
+             (append
+              (list
+               (concat "PATH=" masm-win64-executable-path ";"
+                       (getenv "path"))
+               (concat "INCLUDE=" (mapconcat #'file-name-as-directory masm-win64-include-path ";")
+                       (getenv "include"))
+               (concat "LIB=" (mapconcat #'file-name-as-directory masm-win64-library-path ";")
+                       (getenv "lib")))
+              process-environment)))
+        (compilation-start
+         command nil (lambda (_maj-mode)
+                       "*masm x64 link*")))
+    (let ((process-environment
+           (append
+            (list
+             (concat "PATH=" masm-win32-executable-path ";"
+                     (getenv "path"))
+             (concat "INCLUDE=" (mapconcat #'file-name-as-directory masm-win32-include-path ";")
+                     (getenv "include"))
+             (concat "LIB=" (mapconcat #'file-name-as-directory masm-win32-library-path ";")
+                     (getenv "lib")))
+            process-environment)))
+      (compilation-start
+       command nil (lambda (_maj-mode)
+                     "*masm x86 link*")))))
+
+(defun masm-build (_savep command)
+  "Build COMMAND in `masm-mode'."
+  (interactive
+   (list (if (buffer-modified-p)
+             (let ((savep (y-or-n-p (format "Buffer %s modified; Save it before build? " (current-buffer)))))
+               (if savep
+                   (save-buffer))))
+         (if masm--build-command-used
+             (read-shell-command "Build command: " masm--build-command-used)
+           (let ((command (concat
+                           masm-build-executable " "
+                           (mapconcat (lambda (str) str) masm-build-args " "))))
+             (read-shell-command "Build command: " command)))))
+  (setq masm--build-command-used command)
+  (if masm--program-win64
+      (let ((process-environment
+             (append
+              (list
+               (concat "PATH=" masm-win64-executable-path ";"
+                       (getenv "path"))
+               (concat "INCLUDE=" (mapconcat #'file-name-as-directory masm-win64-include-path ";")
+                       (getenv "include"))
+               (concat "LIB=" (mapconcat #'file-name-as-directory masm-win64-library-path ";")
+                       (getenv "lib")))
+              process-environment)))
+        (compilation-start
+         command nil (lambda (_maj-mode)
+                       "*masm x64 build*")))
+    (let ((process-environment
+           (append
+            (list
+             (concat "PATH=" masm-win32-executable-path ";"
+                     (getenv "path"))
+             (concat "INCLUDE=" (mapconcat #'file-name-as-directory masm-win32-include-path ";")
+                     (getenv "include"))
+             (concat "LIB=" (mapconcat #'file-name-as-directory masm-win32-library-path ";")
+                     (getenv "lib")))
+            process-environment)))
+      (compilation-start
+       command nil (lambda (_maj-mode)
+                     "*masm x86 build*")))))
+
+(defun masm-win32 ()
+  "Change to Win32 highlighting."
+  (interactive)
+  (setq-local masm--program-win64 nil)
+  (setq-local font-lock-keywords masm-win32-font-lock-keywords)
+  (font-lock-flush))
+
+(defun masm-win64 ()
+  "Change to Win64 highlighting."
+  (interactive)
+  (setq-local masm--program-win64 t)
+  (setq-local font-lock-keywords masm-win64-font-lock-keywords)
+  (font-lock-flush))
+
+(defun masm-change-program-type ()
+  "Switch program highlighting."
+  (interactive)
+  (if masm--program-win64
+      (call-interactively #'masm-win32)
+    (call-interactively #'masm-win64)))
+
+(defun masm-mode-before ()
+  "Delay this to a hook instead of running it immediately, due the order in which file local variables are processed."
+  (unless (eql masm--program-win64 masm-program-win64)
+    (setq masm--program-win64 masm-program-win64)
+    (if masm-program-win64
+        (setq-local font-lock-keywords masm-win64-font-lock-keywords)
+      (setq-local font-lock-keywords masm-win32-font-lock-keywords))))
+
+;;;###autoload
+(define-derived-mode masm-mode prog-mode "MASM"
+  "Major mode for editing MASM assembly programs."
+  :group 'masm-mode
+  (setq local-abbrev-table masm-mode-abbrev-table)
+  (if masm--program-win64
+      (setq-local font-lock-defaults '(masm-win64-font-lock-keywords nil :case-fold))
+    (setq-local font-lock-defaults '(masm-win32-font-lock-keywords nil :case-fold)))
+  (setq-local comment-start ";")
+  (setq-local comment-insert-comment-function #'masm-insert-comment)
+  (setq-local imenu-generic-expression masm-imenu-generic-expression)
+    
+  (add-hook 'after-change-major-mode-hook #'masm-mode-before t t))
+
+;;;###autoload
+(add-to-list 'auto-mode-alist '("\\.asm\\'" . masm-mode))
+;;;###autoload
+(add-to-list 'auto-mode-alist '("\\.inc\\'" . masm-mode))
+
+(provide 'masm-mode)
+
+;; Local Variables:
+;; indent-tabs-mode: nil
+;; End:
+
+;;; masm-mode.el ends here