annotate src/compiler.h @ 2367:ecf1ebac70d8

[xemacs-hg @ 2004-11-04 23:05:23 by ben] commit mega-patch configure.in: Turn off -Winline and -Wchar-subscripts. Use the right set of cflags when compiling modules. Rewrite ldap configuration to separate the inclusion of lber (needed in recent Cygwin) from the basic checks for the needed libraries. add a function for MAKE_JUNK_C; initially code was added to generate xemacs.def using this, but it will need to be rewritten. add an rm -f for junk.c to avoid weird Cygwin bug with cp -f onto an existing file. Sort list of auto-detected functions and eliminate unused checks for stpcpy, setlocale and getwd. Add autodetection of Cygwin scanf problems BETA: Rewrite section on configure to indicate what flags are important and what not. digest-doc.c, make-dump-id.c, profile.c, sorted-doc.c: Add proper decls for main(). make-msgfile.c: Document that this is old junk. Move proposal to text.c. make-msgfile.lex: Move proposal to text.c. make-mswin-unicode.pl: Convert error-generating code so that the entire message will be seen as a single unrecognized token. mule/mule-ccl.el: Update docs. lispref/mule.texi: Update CCL docs. ldap/eldap.c: Mule-ize. Use EXTERNAL_LIST_LOOP_2 instead of deleted EXTERNAL_LIST_LOOP. * XEmacs 21.5.18 "chestnut" is released. --------------------------------------------------------------- MULE-RELATED WORK: --------------------------------------------------------------- --------------------------- byte-char conversion --------------------------- buffer.c, buffer.h, insdel.c, text.c: Port FSF algorithm for byte-char conversion, replacing broken previous version. Track the char position of the gap. Add functions to do char-byte conversion downwards as well as upwards. Move comments about algorithm workings to internals manual. --------------------------- work on types --------------------------- alloc.c, console-x-impl.h, dump-data.c, dump-data.h, dumper.c, dialog-msw.c, dired-msw.c, doc.c, editfns.c, esd.c, event-gtk.h, event-msw.c, events.c, file-coding.c, file-coding.h, fns.c, glyphs-eimage.c, glyphs-gtk.c, glyphs-msw.c, glyphs-shared.c, glyphs-x.c, glyphs.c, glyphs.h, gui.c, hpplay.c, imgproc.c, intl-win32.c, lrecord.h, lstream.c, keymap.c, lisp.h, libsst.c, linuxplay.c, miscplay.c, miscplay.h, mule-coding.c, nas.c, nt.c, ntheap.c, ntplay.c, objects-msw.c, objects-tty.c, objects-x.c, print.c, process-nt.c, process.c, redisplay.h, select-common.h, select-gtk.c, select-x.c, sgiplay.c, sound.c, sound.h, sunplay.c, sysfile.h, sysdep.c, syswindows.h, text.c, unexnt.c, win32.c, xgccache.c: Further work on types. This creates a full set of types for all the basic semantics of `char' that I have so far identified, so that its semantics can always be identified for the purposes of proper Mule-safe code, and the raw use of `char' always avoided. (1) More type renaming, for consistency of naming. Char_ASCII -> Ascbyte UChar_ASCII -> UAscbyte Char_Binary -> CBinbyte UChar_Binary -> Binbyte SChar_Binary -> SBinbyte (2) Introduce Rawbyte, CRawbyte, Boolbyte, Chbyte, UChbyte, and Bitbyte and use them. (3) New types Itext, Wexttext and Textcount for separating out the concepts of bytes and textual units (different under UTF-16 and UTF-32, which are potential internal encodings). (4) qxestr*_c -> qxestr*_ascii. lisp.h: New; goes with other qxe() functions. #### Maybe goes in a different section. lisp.h: Group generic int-type defs together with EMACS_INT defs. lisp.h: * lisp.h (WEXTTEXT_IS_WIDE) New defns. lisp.h: New type to replace places where int occurs as a boolean. It's signed because occasionally people may want to use -1 as an error value, and because unsigned ints are viral -- see comments in the internals manual against using them. dynarr.c: int -> Bytecount. --------------------------- Mule-izing --------------------------- device-x.c: Partially Mule-ize. dumper.c, dumper.h: Mule-ize. Use Rawbyte. Use stderr_out not printf. Use wext_*(). sysdep.c, syswindows.h, text.c: New Wexttext API for manipulation of external text that may be Unicode (e.g. startup code under Windows). emacs.c: Mule-ize. Properly deal with argv in external encoding. Use wext_*() and Wexttext. Use Rawbyte. #if 0 some old junk on SCO that is unlikely to be correct. Rewrite allocation code in run-temacs. emacs.c, symsinit.h, win32.c: Rename win32 init function and call it even earlier, to initialize mswindows_9x_p even earlier, for use in startup code (XEUNICODE_P). process.c: Use _wenviron not environ under Windows, to get Unicode environment variables. event-Xt.c: Mule-ize drag-n-drop related stuff. dragdrop.c, dragdrop.h, frame-x.c: Mule-ize. text.h: Add some more stand-in defines for particular kinds of conversion; use in Mule-ization work in frame-x.c etc. --------------------------- Freshening --------------------------- intl-auto-encap-win32.c, intl-auto-encap-win32.h: Regenerate. --------------------------- Unicode-work --------------------------- intl-win32.c, syswindows.h: Factor out common options to MultiByteToWideChar and WideCharToMultiByte. Add convert_unicode_to_multibyte_malloc() and convert_unicode_to_multibyte_dynarr() and use. Add stuff for alloca() conversion of multibyte/unicode. alloc.c: Use dfc_external_data_len() in case of unicode coding system. alloc.c, mule-charset.c: Don't zero out and reinit charset Unicode tables. This fucks up dump-time loading. Anyway, either we load them at dump time or run time, never both. unicode.c: Dump the blank tables as well. --------------------------------------------------------------- DOCUMENTATION, MOSTLY MULE-RELATED: --------------------------------------------------------------- EmacsFrame.c, emodules.c, event-Xt.c, fileio.c, input-method-xlib.c, mule-wnnfns.c, redisplay-gtk.c, redisplay-tty.c, redisplay-x.c, regex.c, sysdep.c: Add comment about Mule work needed. text.h: Add more documentation describing why DFC routines were not written to return their value. Add some other DFC documentation. console-msw.c, console-msw.h: Add pointer to docs in win32.c. emacs.c: Add comments on sources of doc info. text.c, charset.h, unicode.c, intl-win32.c, intl-encap-win32.c, text.h, file-coding.c, mule-coding.c: Collect background comments and related to text matters and internationalization, and proposals for work to be done, in text.c or Internals manual, stuff related to specific textual API's in text.h, and stuff related to internal implementation of Unicode conversion in unicode.c. Put lots of pointers to the comments to make them easier to find. s/mingw32.h, s/win32-common.h, s/win32-native.h, s/windowsnt.h, win32.c: Add bunches of new documentation on the different kinds of builds and environments under Windows and how they work. Collect this info in win32.c. Add pointers to these docs in the relevant s/* files. emacs.c: Document places with long comments. Remove comment about exiting, move to internals manual, put in pointer. event-stream.c: Move docs about event queues and focus to internals manual, put in pointer. events.h: Move docs about event stream callbacks to internals manual, put in pointer. profile.c, redisplay.c, signal.c: Move documentation to the Internals manual. process-nt.c: Add pointer to comment in win32-native.el. lisp.h: Add comments about some comment conventions. lisp.h: Add comment about the second argument. device-msw.c, redisplay-msw.c: @@#### comments are out-of-date. --------------------------------------------------------------- PDUMP WORK (MOTIVATED BY UNICODE CHANGES) --------------------------------------------------------------- alloc.c, buffer.c, bytecode.c, console-impl.h, console.c, device.c, dumper.c, lrecord.h, elhash.c, emodules.h, events.c, extents.c, frame.c, glyphs.c, glyphs.h, mule-charset.c, mule-coding.c, objects.c, profile.c, rangetab.c, redisplay.c, specifier.c, specifier.h, window.c, lstream.c, file-coding.h, file-coding.c: PDUMP: Properly implement dump_add_root_block(), which never worked before, and is necessary for dumping Unicode tables. Pdump name changes for accuracy: XD_STRUCT_PTR -> XD_BLOCK_PTR. XD_STRUCT_ARRAY -> XD_BLOCK_ARRAY. XD_C_STRING -> XD_ASCII_STRING. *_structure_* -> *_block_*. lrecord.h: some comments added about dump_add_root_block() vs dump_add_root_block_ptr(). extents.c: remove incorrect comment about pdump problems with gap array. --------------------------------------------------------------- ALLOCATION --------------------------------------------------------------- abbrev.c, alloc.c, bytecode.c, casefiddle.c, device-msw.c, device-x.c, dired-msw.c, doc.c, doprnt.c, dragdrop.c, editfns.c, emodules.c, file-coding.c, fileio.c, filelock.c, fns.c, glyphs-eimage.c, glyphs-gtk.c, glyphs-msw.c, glyphs-x.c, gui-msw.c, gui-x.c, imgproc.c, intl-win32.c, lread.c, menubar-gtk.c, menubar.c, nt.c, objects-msw.c, objects-x.c, print.c, process-nt.c, process-unix.c, process.c, realpath.c, redisplay.c, search.c, select-common.c, symbols.c, sysdep.c, syswindows.h, text.c, text.h, ui-byhand.c: New macros {alloca,xnew}_{itext,{i,ext,raw,bin,asc}bytes} for more convenient allocation of these commonly requested items. Modify functions to use alloca_ibytes, alloca_array, alloca_extbytes, xnew_ibytes, etc. also XREALLOC_ARRAY, xnew. alloc.c: Rewrite the allocation functions to factor out repeated code. Add assertions for freeing dumped data. lisp.h: Moved down and consolidated with other allocation stuff. lisp.h, dynarr.c: New functions for allocation that's very efficient when mostly in LIFO order. lisp.h, text.c, text.h: Factor out some stuff for general use by alloca()-conversion funs. text.h, lisp.h: Fill out convenience routines for allocating various kinds of bytes and put them in lisp.h. Use them in place of xmalloc(), ALLOCA(). text.h: Fill out the convenience functions so the _MALLOC() kinds match the alloca() kinds. --------------------------------------------------------------- ERROR-CHECKING --------------------------------------------------------------- text.h: Create ASSERT_ASCTEXT_ASCII() and ASSERT_ASCTEXT_ASCII_LEN() from similar Eistring checkers and change the Eistring checkers to use them instead. --------------------------------------------------------------- MACROS IN LISP.H --------------------------------------------------------------- lisp.h: Redo GCPRO declarations. Create a "base" set of functions that can be used to generate any kind of gcpro sets -- regular, ngcpro, nngcpro, private ones used in GC_EXTERNAL_LIST_LOOP_2. buffer.c, callint.c, chartab.c, console-msw.c, device-x.c, dialog-msw.c, dired.c, extents.c, ui-gtk.c, rangetab.c, nt.c, mule-coding.c, minibuf.c, menubar-msw.c, menubar.c, menubar-gtk.c, lread.c, lisp.h, gutter.c, glyphs.c, glyphs-widget.c, fns.c, fileio.c, file-coding.c, specifier.c: Eliminate EXTERNAL_LIST_LOOP, which does not check for circularities. Use EXTERNAL_LIST_LOOP_2 instead or EXTERNAL_LIST_LOOP_3 or EXTERNAL_PROPERTY_LIST_LOOP_3 or GC_EXTERNAL_LIST_LOOP_2 (new macro). Removed/redid comments on EXTERNAL_LIST_LOOP. --------------------------------------------------------------- SPACING FIXES --------------------------------------------------------------- callint.c, hftctl.c, number-gmp.c, process-unix.c: Spacing fixes. --------------------------------------------------------------- FIX FOR GEOMETRY PROBLEM IN FIRST FRAME --------------------------------------------------------------- unicode.c: Add workaround for newlib bug in sscanf() [should be fixed by release 1.5.12 of Cygwin]. toolbar.c: bug fix for problem of initial frame being 77 chars wide on Windows. will be overridden by my other ws. --------------------------------------------------------------- FIX FOR LEAKING PROCESS HANDLES: --------------------------------------------------------------- process-nt.c: Fixes for leaking handles. Inspired by work done by Adrian Aichner <adrian@xemacs.org>. --------------------------------------------------------------- FIX FOR CYGWIN BUG (Unicode-related): --------------------------------------------------------------- unicode.c: Add workaround for newlib bug in sscanf() [should be fixed by release 1.5.12 of Cygwin]. --------------------------------------------------------------- WARNING FIXES: --------------------------------------------------------------- console-stream.c: `reinit' is unused. compiler.h, event-msw.c, frame-msw.c, intl-encap-win32.c, text.h: Add stuff to deal with ANSI-aliasing warnings I got. regex.c: Gather includes together to avoid warning. --------------------------------------------------------------- CHANGES TO INITIALIZATION ROUTINES: --------------------------------------------------------------- buffer.c, emacs.c, console.c, debug.c, device-x.c, device.c, dragdrop.c, emodules.c, eval.c, event-Xt.c, event-gtk.c, event-msw.c, event-stream.c, event-tty.c, events.c, extents.c, faces.c, file-coding.c, fileio.c, font-lock.c, frame-msw.c, glyphs-widget.c, glyphs.c, gui-x.c, insdel.c, lread.c, lstream.c, menubar-gtk.c, menubar-x.c, minibuf.c, mule-wnnfns.c, objects-msw.c, objects.c, print.c, scrollbar-x.c, search.c, select-x.c, text.c, undo.c, unicode.c, window.c, symsinit.h: Call reinit_*() functions directly from emacs.c, for clarity. Factor out some redundant init code. Move disallowed stuff that had crept into vars_of_glyphs() into complex_vars_of_glyphs(). Call init_eval_semi_early() from eval.c not in the middle of vars_of_() in emacs.c since there should be no order dependency in the latter calls. --------------------------------------------------------------- ARMAGEDDON: --------------------------------------------------------------- alloc.c, emacs.c, lisp.h, print.c: Rename inhibit_non_essential_printing_operations to inhibit_non_essential_conversion_operations. text.c: Assert on !inhibit_non_essential_conversion_operations. console-msw.c, print.c: Don't do conversion in SetConsoleTitle or FindWindow to avoid problems during armageddon. Put #errors for NON_ASCII_INTERNAL_FORMAT in places where problems would arise. --------------------------------------------------------------- CHANGES TO THE BUILD PROCEDURE: --------------------------------------------------------------- config.h.in, s/cxux.h, s/usg5-4-2.h, m/powerpc.h: Add comment about correct ordering of this file. Rearrange everything to follow this -- put all #undefs together and before the s&m files. Add undefs for HAVE_ALLOCA, C_ALLOCA, BROKEN_ALLOCA_IN_FUNCTION_CALLS, STACK_DIRECTION. Remove unused HAVE_STPCPY, HAVE_GETWD, HAVE_SETLOCALE. m/gec63.h: Deleted; totally broken, not used at all, not in FSF. m/7300.h, m/acorn.h, m/alliant-2800.h, m/alliant.h, m/altos.h, m/amdahl.h, m/apollo.h, m/att3b.h, m/aviion.h, m/celerity.h, m/clipper.h, m/cnvrgnt.h, m/convex.h, m/cydra5.h, m/delta.h, m/delta88k.h, m/dpx2.h, m/elxsi.h, m/ews4800r.h, m/gould.h, m/hp300bsd.h, m/hp800.h, m/hp9000s300.h, m/i860.h, m/ibmps2-aix.h, m/ibmrs6000.h, m/ibmrt-aix.h, m/ibmrt.h, m/intel386.h, m/iris4d.h, m/iris5d.h, m/iris6d.h, m/irist.h, m/isi-ov.h, m/luna88k.h, m/m68k.h, m/masscomp.h, m/mg1.h, m/mips-nec.h, m/mips-siemens.h, m/mips.h, m/news.h, m/nh3000.h, m/nh4000.h, m/ns32000.h, m/orion105.h, m/pfa50.h, m/plexus.h, m/pmax.h, m/powerpc.h, m/pyrmips.h, m/sequent-ptx.h, m/sequent.h, m/sgi-challenge.h, m/symmetry.h, m/tad68k.h, m/tahoe.h, m/targon31.h, m/tekxd88.h, m/template.h, m/tower32.h, m/tower32v3.h, m/ustation.h, m/vax.h, m/wicat.h, m/xps100.h: Delete C_ALLOCA, HAVE_ALLOCA, STACK_DIRECTION, BROKEN_ALLOCA_IN_FUNCTION_CALLS. All of this is auto-detected. When in doubt, I followed recent FSF sources, which also have these things deleted.
author ben
date Thu, 04 Nov 2004 23:08:28 +0000
parents ba4677f54a05
children 3d8143fc88e1
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1 /* Compiler-specific definitions for XEmacs.
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2 Copyright (C) 1998-1999, 2003 Free Software Foundation, Inc.
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3 Copyright (C) 1994 Richard Mlynarik.
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4 Copyright (C) 1995, 1996, 2000-2004 Ben Wing.
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Synched up with: not in FSF. */
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24
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25 /* Authorship:
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26
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27 NOT_REACHED, DOESNT_RETURN, PRINTF_ARGS by Richard Mlynarik, c. 1994.
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28 RETURN_SANS_WARNING by Martin buchholz, 1998 or 1999.
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29 Many changes and improvements by Jerry James, 2003.
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30 Split out of lisp.h, reorganized, and modernized.
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31 {BEGIN,END}_C_DECLS, NEED_GCC, GCC_VERSION
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32 ATTRIBUTE_MALLOC, ATTRIBUTE_CONST, ATTRIBUTE_PURE, UNUSED
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33 */
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34
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35 #ifndef INCLUDED_compiler_h
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36 #define INCLUDED_compiler_h
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37
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38 /* Define min() and max(). (Some compilers put them in strange places that
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39 won't be referenced by include files used by XEmacs, such as 'macros.h'
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40 under Solaris.) */
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42 #ifndef min
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43 # define min(a,b) (((a) <= (b)) ? (a) : (b))
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44 #endif
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45 #ifndef max
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46 # define max(a,b) (((a) > (b)) ? (a) : (b))
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47 #endif
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48
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49 /* Regular C complains about possible clobbering of local vars NOT declared
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50 as volatile if there's a longjmp() in a function. C++ complains if such
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51 vars ARE volatile; or more correctly, sans volatile no problem even when
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52 you longjmp, avec volatile you get unfixable compile errors like
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53
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54 /src/xemacs/lilfix/src/process-unix.c: In function `void
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55 unix_send_process(Lisp_Object, lstream*)':
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56 /src/xemacs/lilfix/src/process-unix.c:1577: no matching function for call to `
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57 Lisp_Object::Lisp_Object(volatile Lisp_Object&)'
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58 /src/xemacs/lilfix/src/lisp-union.h:32: candidates are:
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59 Lisp_Object::Lisp_Object(const Lisp_Object&)
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60 */
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61
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62 #ifdef __cplusplus
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63 # define VOLATILE_IF_NOT_CPP
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64 #else
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65 # define VOLATILE_IF_NOT_CPP volatile
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66 #endif
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67
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68 /* Avoid indentation problems when XEmacs sees the curly braces */
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69 #ifndef BEGIN_C_DECLS
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70 # ifdef __cplusplus
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71 # define BEGIN_C_DECLS extern "C" {
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72 # define END_C_DECLS }
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73 # else
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74 # define BEGIN_C_DECLS
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75 # define END_C_DECLS
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76 # endif
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77 #endif
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78
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79 /* Guard against older gccs that did not define all of these symbols */
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80 #ifdef __GNUC__
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81 # ifndef __GNUC_MINOR__
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82 # define __GNUC_MINOR__ 0
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83 # endif
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84 # ifndef __GNUC_PATCHLEVEL__
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85 # define __GNUC_PATCHLEVEL__ 0
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86 # endif
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87 #endif /* __GNUC__ */
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88
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89 /* Simplify testing for specific GCC versions. For non-GNU compilers,
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90 GCC_VERSION evaluates to zero. */
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91 #ifndef NEED_GCC
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92 # define NEED_GCC(major,minor,patch) (major * 1000000 + minor * 1000 + patch)
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93 #endif /* NEED_GCC */
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94 #ifndef GCC_VERSION
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95 # ifdef __GNUC__
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96 # define GCC_VERSION NEED_GCC (__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
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97 # else
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98 # define GCC_VERSION 0
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99 # endif /* __GNUC__ */
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100 #endif /* GCC_VERSION */
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101
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102 /* GCC < 2.6.0 could only declare one attribute per function. In that case,
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103 we define DOESNT_RETURN in preference to PRINTF_ARGS, which is only used
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104 for checking args against the string spec. */
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105 #ifndef PRINTF_ARGS
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106 # if (GCC_VERSION >= NEED_GCC (2, 6, 0))
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107 # define PRINTF_ARGS(string_index,first_to_check) \
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108 __attribute__ ((format (printf, string_index, first_to_check)))
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109 # else
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110 # define PRINTF_ARGS(string_index,first_to_check)
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111 # endif /* GNUC */
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112 #endif
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113
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114 #ifndef DOESNT_RETURN_TYPE
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115 # if (GCC_VERSION > NEED_GCC (0, 0, 0))
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116 # if (GCC_VERSION >= NEED_GCC (2, 5, 0))
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117 # ifndef __INTEL_COMPILER
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118 # define RETURN_NOT_REACHED(value) DO_NOTHING
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119 # endif
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120 # define DOESNT_RETURN_TYPE(rettype) rettype
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121 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) rettype decl \
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122 __attribute__ ((noreturn))
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123 # else /* GCC_VERSION < NEED_GCC (2, 5, 0) */
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124 # define DOESNT_RETURN_TYPE(rettype) rettype volatile
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125 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) rettype volatile decl
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126 # endif /* GCC_VERSION >= NEED_GCC (2, 5, 0) */
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127 # else /* not gcc */
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128 # define DOESNT_RETURN_TYPE(rettype) rettype
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129 # define DECLARE_DOESNT_RETURN_TYPE(rettype,decl) rettype decl
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130 # endif /* GCC_VERSION > NEED_GCC (0, 0, 0) */
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131 #endif /* DOESNT_RETURN_TYPE */
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132 #ifndef DOESNT_RETURN
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133 # define DOESNT_RETURN DOESNT_RETURN_TYPE (void)
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134 # define DECLARE_DOESNT_RETURN(decl) DECLARE_DOESNT_RETURN_TYPE (void, decl)
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135 #endif /* DOESNT_RETURN */
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136
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137 /* Another try to fix SunPro C compiler warnings */
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138 /* "end-of-loop code not reached" */
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139 /* "statement not reached */
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140 #if defined __SUNPRO_C || defined __USLC__
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141 # define RETURN_SANS_WARNINGS if (1) return
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142 # define RETURN_NOT_REACHED(value) DO_NOTHING
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143 #endif
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144
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145 /* More ways to shut up compiler. This works in Fcommand_loop_1(),
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146 where there's an infinite loop in a function returning a Lisp object.
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147 */
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148 #if defined (_MSC_VER) || defined (__SUNPRO_C) || defined (__SUNPRO_CC) || \
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149 (defined (DEC_ALPHA) && defined (OSF1))
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150 # define DO_NOTHING_DISABLING_NO_RETURN_WARNINGS if (0) return Qnil
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151 #else
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152 # define DO_NOTHING_DISABLING_NO_RETURN_WARNINGS DO_NOTHING
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153 #endif
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154
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155 #ifndef RETURN_NOT_REACHED
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156 # define RETURN_NOT_REACHED(value) return (value)
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157 #endif
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158
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159 #ifndef RETURN_SANS_WARNINGS
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160 # define RETURN_SANS_WARNINGS return
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161 #endif
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162
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163 #ifndef DO_NOTHING
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164 # define DO_NOTHING do {} while (0)
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165 #endif
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166
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167 #ifndef DECLARE_NOTHING
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168 # define DECLARE_NOTHING struct nosuchstruct
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169 #endif
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170
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171 #ifndef ATTRIBUTE_MALLOC
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172 # if (GCC_VERSION >= NEED_GCC (2, 96, 0))
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173 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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174 # else
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175 # define ATTRIBUTE_MALLOC
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176 # endif /* GCC_VERSION >= NEED_GCC (2, 96, 0) */
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177 #endif /* ATTRIBUTE_MALLOC */
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178
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179 #ifndef ATTRIBUTE_PURE
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180 # if (GCC_VERSION >= NEED_GCC (2, 96, 0))
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181 # define ATTRIBUTE_PURE __attribute__ ((pure))
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182 # else
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183 # define ATTRIBUTE_PURE
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184 # endif /* GCC_VERSION >= NEED_GCC (2, 96, 0) */
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185 #endif /* ATTRIBUTE_PURE */
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186
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187 #ifndef ATTRIBUTE_CONST
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188 # if (GCC_VERSION >= NEED_GCC (2, 5, 0))
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189 # define ATTRIBUTE_CONST __attribute__ ((const))
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190 # define CONST_FUNC
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191 # else
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192 # define ATTRIBUTE_CONST
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193 # define CONST_FUNC const
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194 # endif /* GCC_VERSION >= NEED_GCC (2, 5, 0) */
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195 #endif /* ATTRIBUTE_CONST */
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196
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197 /* Unused declarations; g++ and icc do not support this. */
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198 #ifndef UNUSED_ARG
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199 # define UNUSED_ARG(decl) unused_##decl
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200 #endif
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201 #ifndef UNUSED
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202 # if defined(__GNUC__) && !defined(__cplusplus) && !defined(__INTEL_COMPILER)
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203 # define ATTRIBUTE_UNUSED __attribute__ ((unused))
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204 # else
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205 # define ATTRIBUTE_UNUSED
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206 # endif
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207 # define UNUSED(decl) UNUSED_ARG (decl) ATTRIBUTE_UNUSED
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208 # ifdef MULE
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209 # define USED_IF_MULE(decl) decl
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210 # else
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211 # define USED_IF_MULE(decl) UNUSED (decl)
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212 # endif
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213 # if defined (MULE) || defined (ERROR_CHECK_TEXT)
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214 # define USED_IF_MULE_OR_CHECK_TEXT(decl) decl
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215 # else
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216 # define USED_IF_MULE_OR_CHECK_TEXT(decl) UNUSED (decl)
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217 # endif
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218 #endif /* UNUSED */
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219
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220 #ifdef DEBUG_XEMACS
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221 # define REGISTER
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222 # define register
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223 #else
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224 # define REGISTER register
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225 #endif
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226
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227 #if defined(HAVE_MS_WINDOWS) && defined(HAVE_SHLIB)
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228 # ifdef EMACS_MODULE
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229 # define MODULE_API __declspec(dllimport)
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230 # else
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231 # define MODULE_API __declspec(dllexport)
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232 # endif
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233 #else
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234 # define MODULE_API
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235 #endif
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236
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237 /* Under "strict-aliasing" assumptions, you're not necessarily allowed to
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238 access the same memory address as two different types. The proper way
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239 around that is with a union. The macros below help out, e.g. the
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240 definition of XE_MAKEPOINTS(val) is
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241
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242 ANSI_ALIASING_TYPEDEF (POINTS, POINTS);
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243 #define XE_MAKEPOINTS(l) ANSI_ALIASING_CAST (POINTS, l)
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244
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245 replacing
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246
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247 BAD!!! #define XE_MAKEPOINTS(l) (* (POINTS *) &(l))
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248
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249 On the other hand, if you are just casting from one pointer to the other
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250 in order to pass a pointer to another function, it's probably OK to just
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251 trick GCC by inserting an intermediate cast to (void *), to avoid
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252 warnings about "dereferencing type-punned pointer". #### I don't know
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253 how kosher this is, but do strict-aliasing rules really apply across
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254 functions?
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255
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256 Note that the input to e.g. VOIDP_CAST must be an lvalue (i.e. not
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257 &(something)), but the value of the macro is also an lvalue, so in place
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258 of `(void **) &foo' you could write `& VOIDP_CAST (foo)' if you are
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259 subsequently dereferencing the value or don't feel comfortable doing a
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260 trick like `(void **) (void *) &foo'.
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261
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262 Unfortunately, it does not work to just define the union type on the fly in
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263 the cast -- otherwise, we could avoid the need for a typedef. Or rather,
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264 it does work under gcc but not under Visual C++.
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265
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266 --ben
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267 */
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268
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269 #define ANSI_ALIASING_TYPEDEF(name, type) typedef union { char c; type p; } *ANSI_ALIASING_##name
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270 #define ANSI_ALIASING_CAST(name, val) (((ANSI_ALIASING_##name) &(val))->p)
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271 ANSI_ALIASING_TYPEDEF (voidp, void *);
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272 /* VOIDP_CAST: Cast an lvalue to (void *) in a way that is ANSI-aliasing
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273 safe and will not result in GCC warnings. The result is still an
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274 lvalue, so you can assign to it or take its address. */
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275 #define VOIDP_CAST(l) ANSI_ALIASING_CAST (voidp, l)
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276
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277 #endif /* INCLUDED_compiler_h */