lisp/cedet/semantic/bovine/gcc.el

   1 ;;; semantic/bovine/gcc.el --- gcc querying special code for the C parser
   2
   3 ;; Copyright (C) 2008, 2009 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric M. Ludlam <eric@siege-engine.com>
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software: you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23 ;;
  24 ;; GCC stores things in special places.  These functions will query
  25 ;; GCC, and set up the preprocessor and include paths.
  26
  27 (require 'semantic/dep)
  28
  29 (defvar semantic-lex-c-preprocessor-symbol-file)
  30 (defvar semantic-lex-c-preprocessor-symbol-map)
  31 (declare-function semantic-c-reset-preprocessor-symbol-map
  32                   "semantic/bovine/gcc")
  33
  34 ;;; Code:
  35
  36 (defun semantic-gcc-query (gcc-cmd &rest gcc-options)
  37   "Return program output to both standard output and standard error.
  38 GCC-CMD is the program to execute and GCC-OPTIONS are the options
  39 to give to the program."
  40   ;; $ gcc -v
  41   ;;
  42   (let ((buff (get-buffer-create " *gcc-query*"))
  43         (old-lc-messages (getenv "LC_ALL")))
  44     (save-excursion
  45       (set-buffer buff)
  46       (erase-buffer)
  47       (setenv "LC_ALL" "C")
  48       (condition-case nil
  49           (apply 'call-process gcc-cmd nil (cons buff t) nil gcc-options)
  50         (error ;; Some bogus directory for the first time perhaps?
  51          (let ((default-directory (expand-file-name "~/")))
  52            (condition-case nil
  53                (apply 'call-process gcc-cmd nil (cons buff t) nil gcc-options)
  54              (error ;; gcc doesn't exist???
  55               nil)))))
  56       (setenv "LC_ALL" old-lc-messages)
  57       (prog1
  58           (buffer-string)
  59         (kill-buffer buff)
  60         )
  61       )))
  62
  63 ;;(semantic-gcc-get-include-paths "c")
  64 ;;(semantic-gcc-get-include-paths "c++")
  65 (defun semantic-gcc-get-include-paths (lang)
  66   "Return include paths as gcc use them for language LANG."
  67   (let* ((gcc-cmd (cond
  68                    ((string= lang "c") "gcc")
  69                    ((string= lang "c++") "c++")
  70                    (t (if (stringp lang)
  71                           (error "Unknown lang: %s" lang)
  72                         (error "LANG=%S, should be a string" lang)))))
  73          (gcc-output (semantic-gcc-query gcc-cmd "-v" "-E" "-x" lang null-device))
  74          (lines (split-string gcc-output "\n"))
  75          (include-marks 0)
  76          (inc-mark "#include ")
  77          (inc-mark-len (length "#include "))
  78          inc-path)
  79     ;;(message "gcc-output=%s" gcc-output)
  80     (dolist (line lines)
  81       (when (> (length line) 1)
  82         (if (= 0 include-marks)
  83             (when (and (> (length line) inc-mark-len)
  84                        (string= inc-mark (substring line 0 inc-mark-len)))
  85               (setq include-marks (1+ include-marks)))
  86           (let ((chars (append line nil)))
  87             (when (= 32 (nth 0 chars))
  88               (let ((path (substring line 1)))
  89                 (when (file-accessible-directory-p path)
  90                   (when (if (memq system-type '(windows-nt))
  91                             (/= ?/ (nth 1 chars))
  92                           (= ?/ (nth 1 chars)))
  93                     (add-to-list 'inc-path
  94                                  (expand-file-name (substring line 1))
  95                                  t)))))))))
  96     inc-path))
  97
  98
  99 (defun semantic-cpp-defs (str)
 100   "Convert CPP output STR into a list of cons cells with defines for C++."
 101   (let ((lines (split-string str "\n"))
 102         (lst nil))
 103     (dolist (L lines)
 104       (let ((dat (split-string L)))
 105         (when (= (length dat) 3)
 106           (add-to-list 'lst (cons (nth 1 dat) (nth 2 dat))))))
 107     lst))
 108
 109 (defun semantic-gcc-fields (str)
 110   "Convert GCC output STR into an alist of fields."
 111   (let ((fields nil)
 112         (lines (split-string str "\n"))
 113         )
 114     (dolist (L lines)
 115       ;; For any line, what do we do with it?
 116       (cond ((or (string-match "Configured with\\(:\\)" L)
 117                  (string-match "\\(:\\)\\s-*[^ ]*configure " L))
 118              (let* ((parts (substring L (match-end 1)))
 119                     (opts (split-string parts " " t))
 120                     )
 121                (dolist (O (cdr opts))
 122                  (let* ((data (split-string O "="))
 123                         (sym (intern (car data)))
 124                         (val (car (cdr data))))
 125                    (push (cons sym val) fields)
 126                    ))
 127                ))
 128             ((string-match "gcc[ -][vV]ersion" L)
 129              (let* ((vline (substring L (match-end 0)))
 130                     (parts (split-string vline " ")))
 131                (push (cons 'version (nth 1 parts)) fields)))
 132             ((string-match "Target: " L)
 133              (let ((parts (split-string L " ")))
 134                (push (cons 'target (nth 1 parts)) fields)))
 135             ))
 136     fields))
 137
 138 (defvar semantic-gcc-setup-data nil
 139   "The GCC setup data.
 140 This is setup by `semantic-gcc-setup'.
 141 This is an alist, and should include keys of:
 142   'version - The version of gcc
 143   '--host  - The host symbol.  (Used in include directories)
 144   '--prefix - Where GCC was installed.
 145 It should also include other symbols GCC was compiled with.")
 146
 147 ;;;###autoload
 148 (defun semantic-gcc-setup ()
 149   "Setup Semantic C/C++ parsing based on GCC output."
 150   (interactive)
 151   (let* ((fields (or semantic-gcc-setup-data
 152                      (semantic-gcc-fields (semantic-gcc-query "gcc" "-v"))))
 153          (defines (semantic-cpp-defs (semantic-gcc-query "cpp" "-E" "-dM" "-x" "c++" null-device)))
 154          (ver (cdr (assoc 'version fields)))
 155          (host (or (cdr (assoc 'target fields))
 156                    (cdr (assoc '--target fields))
 157                    (cdr (assoc '--host fields))))
 158          (prefix (cdr (assoc '--prefix fields)))
 159          ;; gcc output supplied paths
 160          (c-include-path (semantic-gcc-get-include-paths "c"))
 161          (c++-include-path (semantic-gcc-get-include-paths "c++")))
 162     ;; Remember so we don't have to call GCC twice.
 163     (setq semantic-gcc-setup-data fields)
 164     (unless c-include-path
 165       ;; Fallback to guesses
 166       (let* ( ;; gcc include dirs
 167              (gcc-exe (locate-file "gcc" exec-path exec-suffixes 'executable))
 168              (gcc-root (expand-file-name ".." (file-name-directory gcc-exe)))
 169              (gcc-include (expand-file-name "include" gcc-root))
 170              (gcc-include-c++ (expand-file-name "c++" gcc-include))
 171              (gcc-include-c++-ver (expand-file-name ver gcc-include-c++))
 172              (gcc-include-c++-ver-host (expand-file-name host gcc-include-c++-ver)))
 173         (setq c-include-path
 174               (remove-if-not 'file-accessible-directory-p
 175                              (list "/usr/include" gcc-include)))
 176         (setq c++-include-path
 177               (remove-if-not 'file-accessible-directory-p
 178                              (list "/usr/include"
 179                                    gcc-include
 180                                    gcc-include-c++
 181                                    gcc-include-c++-ver
 182                                    gcc-include-c++-ver-host)))))
 183
 184     ;;; Fix-me: I think this part might have been a misunderstanding, but I am not sure.
 185     ;; If this option is specified, try it both with and without prefix, and with and without host
 186     ;; (if (assoc '--with-gxx-include-dir fields)
 187     ;;     (let ((gxx-include-dir (cdr (assoc '--with-gxx-include-dir fields))))
 188     ;;       (nconc try-paths (list gxx-include-dir
 189     ;;                              (concat prefix gxx-include-dir)
 190     ;;                              (concat gxx-include-dir "/" host)
 191     ;;                              (concat prefix gxx-include-dir "/" host)))))
 192
 193     ;; Now setup include paths etc
 194     (dolist (D (semantic-gcc-get-include-paths "c"))
 195       (semantic-add-system-include D 'c-mode))
 196     (dolist (D (semantic-gcc-get-include-paths "c++"))
 197       (semantic-add-system-include D 'c++-mode)
 198       (let ((cppconfig (concat D "/bits/c++config.h")))
 199         ;; Presumably there will be only one of these files in the try-paths list...
 200         (when (file-readable-p cppconfig)
 201           ;; Add it to the symbol file
 202           (if (boundp 'semantic-lex-c-preprocessor-symbol-file)
 203               ;; Add to the core macro header list
 204               (add-to-list 'semantic-lex-c-preprocessor-symbol-file cppconfig)
 205             ;; Setup the core macro header
 206             (setq semantic-lex-c-preprocessor-symbol-file (list cppconfig)))
 207           )))
 208     (if (not (boundp 'semantic-lex-c-preprocessor-symbol-map))
 209         (setq semantic-lex-c-preprocessor-symbol-map nil))
 210     (dolist (D defines)
 211       (add-to-list 'semantic-lex-c-preprocessor-symbol-map D))
 212     (when (featurep 'semantic/bovine/c)
 213       (semantic-c-reset-preprocessor-symbol-map))
 214     nil))
 215
 216 (provide 'semantic/bovine/gcc)
 217
 218 ;; Local variables:
 219 ;; generated-autoload-file: "../loaddefs.el"
 220 ;; generated-autoload-feature: semantic/loaddefs
 221 ;; generated-autoload-load-name: "semantic/bovine/gcc"
 222 ;; End:
 223
 224 ;;; semantic/bovine/gcc.el ends here