annotate etc/DEBUG @ 872:79c6ff3eef26

[xemacs-hg @ 2002-06-20 21:18:01 by ben] font changes etc.; some 21.4 changes mule/mule-msw-init-late.el: Specify charset->windows-registry conversion. mule/mule-x-init.el: Delete extra mule font additions here. Put them in faces.c. cl-macs.el: Document better. font-lock.el: Move Lisp function regexp to lisp-mode.el. lisp-mode.el: Various indentation fixes: Handle flet functions better. Handle argument lists in defuns and flets. Handle quoted lists, e.g. property lists -- don't indent like function calls. Distinguish between lambdas and other lists. lisp-mode.el: Handle this form. faces.el, font-menu.el, font.el, gtk-faces.el, msw-faces.el, msw-font-menu.el, x-faces.el, x-init.el: Major overhaul of face-handling code: -- Fix lots of bogus code in msw-faces.el, msw-font-menu.el, font-menu.el that was "truenaming" font specs -- i.e. in the process of frobbing a particular field in a general user-specified font spec with wildcarded fields, sticking in particular values for all the remaining wildcarded fields. This bug was rampant everywhere except in x-faces.el (the oldest and only correctly written code). This also means that we need to work with font names at all times and not font instances, because a font instance is essentially a truenamed font. -- Total rewrite of extremely junky code in msw-faces.el. Work with names as well as font instances, and return names; stop truenaming when canonicalizing and frobbing; fix handling of the combined style field, i.e. weight/slant (also fixed in font.el). -- Totally rewrite the frobbing functions in faces.el. This time, we frob all the instantiators rather than just computing a single instance value and working backwards. That way, e.g., `bold' will work for all charsets that have bold available, rather than only for whatever charset was part of the computed font instance (another example of the truename virus). Also fix up code to look at the fallbacks (all of them) when no global value present, so we don't need to put something in the global value. Intelligently handle a request to frob a buffer locale, rather than signalling an error. When frobbing instantiators, try hard to figure out what device type is associated with them, and frob each according to its own proper device type. Correctly handle inheritance vectors given as instantiators. Preserve existing tags when putting back frobbed instantiators. Extract out general specifier-frobbing code into specifier.el. Document everything cleanly. Do lots of other things better, etc. -- Don't duplicatively set a global specification for the default font -- it's already in the fallback and we no longer need a default global specification present. Delete various code in x-faces.el and msw-faces.el that duplicated the lists of fonts in faces.c. -- init-global-faces was not being called at all under MS Windows! Major bogosity. That caused device-specific values to get stuck into all the fonts, making it very hard to change them -- setting global specs caused nothing to happen. -- Correct weight names in font.el. -- Lots more font fixups in objects*.c. Printer.el: Warning fix. specifier.el: Add more args to map-specifier. Add various "heuristic" specifier functions to aid in creation of specifier-munging code such as in faces.el. subr.el: New functions. lwlib.c: Fix warning. config.inc.samp: Clean up, add args to control fastcall (not yet supported! the changes needed are in another ws of mine), profile support, vc6 support, union-type. xemacs.dsp, xemacs.mak: Semi-major overhaul. Fix bug where dump-id was always getting recomputed, forcing a redump even when nothing changed. Add support for fastcall. Support edit-and-continue (on by default) with vc6. Use incremental linking when doing a debug compilation. Add support for profiling. Consolidate the various debug flags. Partial support for "batch-compiling" -- compiling many files on a single invocation of the compiler. Doesn't seem to help that much for me, so it's not finished or enabled by default. Remove HAVE_MSW_C_DIRED, we always do. Correct some sloppy use of directories. s/cygwin32.h: Allow pdump to work under Cygwin (mmap is broken, so need to undefine HAVE_MMAP). s/win32-common.h, s/windowsnt.h: Support for fastcall. Add WIN32_ANY for identifying all Win32 variants (Cygwin, native, MinGW). Both of these are properly used in another ws. alloc.c, balloon-x.c, buffer.c, bytecode.c, callint.c, cm.c, cmdloop.c, cmds.c, console-gtk.c, console-gtk.h, console-msw.c, console-msw.h, console-stream.c, console-stream.h, console-tty.c, console-tty.h, console-x.c, console-x.h, console.c, console.h, device-gtk.c, device-msw.c, device-tty.c, device-x.c, device.c, device.h, devslots.h, dialog-gtk.c, dialog-msw.c, dialog-x.c, dialog.c, dired-msw.c, editfns.c, emacs.c, event-Xt.c, event-gtk.c, event-msw.c, event-stream.c, event-tty.c, event-unixoid.c, events.c, extents.c, extents.h, faces.c, fileio.c, fns.c, frame-gtk.c, frame-msw.c, frame-tty.c, frame-x.c, frame.c, frame.h, glyphs-eimage.c, glyphs-gtk.c, glyphs-msw.c, glyphs-widget.c, glyphs-x.c, glyphs.c, glyphs.h, gui-gtk.c, gui-msw.c, gui-x.c, gui.c, gutter.c, input-method-xlib.c, intl-encap-win32.c, intl-win32.c, keymap.c, lisp.h, macros.c, menubar-gtk.c, menubar-msw.c, menubar-x.c, menubar.c, menubar.h, minibuf.c, mule-charset.c, nt.c, objects-gtk.c, objects-gtk.h, objects-msw.c, objects-msw.h, objects-tty.c, objects-tty.h, objects-x.c, objects-x.h, objects.c, objects.h, postgresql.c, print.c, process.h, redisplay-gtk.c, redisplay-msw.c, redisplay-output.c, redisplay-tty.c, redisplay-x.c, redisplay.c, redisplay.h, scrollbar-gtk.c, scrollbar-msw.c, scrollbar-x.c, scrollbar.c, select-gtk.c, select-msw.c, select-x.c, select.c, signal.c, sound.c, specifier.c, symbols.c, syntax.c, sysdep.c, syssignal.h, syswindows.h, toolbar-common.c, toolbar-gtk.c, toolbar-msw.c, toolbar-x.c, toolbar.c, unicode.c, window.c, window.h: The following are the major changes made: (1) Separation of various header files into an external and an internal version, similar to the existing separation of process.h and procimpl.h. Eventually this should be done for all Lisp objects. The external version has the same name as currently; the internal adds -impl. The external file has XFOO() macros for objects, but the structure is opaque and defined only in the internal file. It's now reasonable to move all prototypes in lisp.h into the appropriate external file, and this should be done. Currently, separation has been done on extents.h, objects*.h, console.h, device.h, frame.h, and window.h. For c/d/f/w, the most basic properties are available in the external header file, with the macros resolving to functions. In the internal header file, the macros are redefined to directly access the structure. Also, the global MARK_FOO_CHANGED macros have been made into functions so that they can be accessed without needing to include lots of -impl headers -- they are used in almost exclusively in non-time-critical functions, and take up enough time that the function overhead will be negligible. Similarly, the function overhead from making the basic properties mentioned above into functions is negligible, and code that does heavy accessing of c/d/f/w structures inevitably ends up needing the internal header files, anyway. (2) More face changes. -- Major rewrite of objects-msw.c. Now handles wildcard specs properly, rather than "truenaming" (or even worse, signalling an error, which previously happened with some of the fallbacks if you tried to use them in make-font-instance!). -- Split charset matching of fonts into two stages -- one to find a font specifically designed for a particular charset (by examining its registry), the second to find a Unicode font that can support the charset. This needs to proceed as two complete, separate instantiations in order to work properly (otherwise many of the fonts in the HELLO page look wrong). This should also make it easy to support iso10646 (Unicode) fonts under X. -- All default values for fonts are now completely specified in the fallbacks. Stuff from mule-x-init.el has all been moved here, merged with the existing specs, and totally rethought so you get sensible results. (HELLO now looks much better!). -- Generalize the "default X/GTK device" stuff into a per-device-type "default device". -- Add mswindows-{set-}charset-registry. In time, charset<->code-page conversion functions will be removed. -- Wrap protective code around calls to compute device specifier tags, and do this computation before calling the face initialization code because the latter may need these tags to be correctly updated. (3) Other changes. EmacsFrame.c, glyphs-msw.c, eval.c, gui-x.c, intl-encap-win32.c, search.c, signal.c, toolbar-msw.c, unicode.c: Warning fixes. config.h.in: #undefs meant to be frobbed by configure *MUST* go inside of #ifndef WIN32_NO_CONFIGURE, and everything else *MUST* go outside! eval.c: Let detailed backtraces be detailed. specifier.c: Don't override user's print-string-length/print-length settings. glyphs.c: New function image-instance-instantiator. config.h.in, sysdep.c: Changes for fastcall. sysdep.c, nt.c: Fix up a previous botched patch that tried to add support for both EEXIST and EACCES. IF THE BOTCHED PATCH WENT INTO 21.4, THIS FIXUP NEEDS TO GO IN, TOO. search.c: Fix *evil* crash due to incorrect synching of syntax-cache code with 21.1. THIS SHOULD GO INTO 21.4.
author ben
date Thu, 20 Jun 2002 21:19:10 +0000
parents 376386a54a3c
children
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1 Debugging GNU Emacs
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2 Copyright (c) 1985 Richard M. Stallman.
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3
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4 Permission is granted to anyone to make or distribute verbatim copies
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5 of this document as received, in any medium, provided that the
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6 copyright notice and permission notice are preserved,
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7 and that the distributor grants the recipient permission
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8 for further redistribution as permitted by this notice.
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9
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10 Permission is granted to distribute modified versions
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11 of this document, or of portions of it,
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12 under the above conditions, provided also that they
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13 carry prominent notices stating who last changed them.
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14
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15 On 4.2 you will probably find that dbx does not work for
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16 debugging GNU Emacs. For one thing, dbx does not keep the
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17 inferior process's terminal modes separate from its own.
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18 For another, dbx does not put the inferior in a separate
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19 process group, which makes trouble when an inferior uses
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20 interrupt input, which GNU Emacs must do on 4.2.
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21
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22 dbx has also been observed to have other problems,
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23 such as getting incorrect values for register variables
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24 in stack frames other than the innermost one.
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25
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26 The Emacs distribution now contains GDB, the new source-level
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27 debugger for the GNU system. GDB works for debugging Emacs.
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28 GDB currently runs on vaxes under 4.2 and on Sun 2 and Sun 3
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29 systems.
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30
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31
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32 ** Some useful techniques
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33
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34 `Fsignal' is a very useful place to stop in.
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35 All Lisp errors go through there.
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36
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37 It is useful, when debugging, to have a guaranteed way
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38 to return to the debugger at any time. If you are using
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39 interrupt-driven input, which is the default, then Emacs is using
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40 RAW mode and the only way you can do it is to store
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41 the code for some character into the variable stop_character:
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42
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43 set stop_character = 29
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44
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45 makes Control-] (decimal code 29) the stop character.
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46 Typing Control-] will cause immediate stop. You cannot
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47 use the set command until the inferior process has been started.
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48 Put a breakpoint early in `main', or suspend the Emacs,
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49 to get an opportunity to do the set command.
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50
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51 If you are using cbreak input (see the Lisp function set-input-mode),
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52 then typing Control-g will cause a SIGINT, which will return control
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53 to the debugger immediately unless you have done
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54
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55 ignore 3 (in dbx)
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56 or handle 3 nostop noprint (in gdb)
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57
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58 You will note that most of GNU Emacs is written to avoid
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59 declaring a local variable in an inner block, even in
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60 cases where using one would be the cleanest thing to do.
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61 This is because dbx cannot access any of the variables
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62 in a function which has even one variable defined in an
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63 inner block. A few functions in GNU Emacs do have variables
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64 in inner blocks, only because I wrote them before realizing
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65 that dbx had this problem and never rewrote them to avoid it.
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66
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67 I believe that GDB does not have such a problem.
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68
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69
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70 ** Examining Lisp object values.
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71
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72 When you have a live process to debug, and it has not encountered a
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73 fatal error, you can use the GDB command `pr'. First print the value
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74 in the ordinary way, with the `p' command. Then type `pr' with no
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75 arguments. This calls a subroutine which uses the Lisp printer.
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76
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77 If you can't use this command, either because the process can't run
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78 a subroutine or because the data is invalid, you can fall back on
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79 lower-level commands.
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80
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81 Use the `xtype' command to print out the data type of the last data
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82 value. Once you know the data type, use the command that corresponds
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83 to that type. Here are these commands:
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84
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85 xint xptr xwindow xmarker xoverlay xmiscfree xintfwd xboolfwd xobjfwd
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86 xbufobjfwd xkbobjfwd xbuflocal xbuffer xsymbol xstring xvector xframe
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87 xwinconfig xcompiled xcons xcar xcdr xsubr xprocess xfloat xscrollbar
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88
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89 Each one of them applies to a certain type or class of types.
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90 (Some of these types are not visible in Lisp, because they exist only
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91 internally.)
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92
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93 Each x... command prints some information about the value, and
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94 produces a GDB value (subsequently available in $) through which you
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95 can get at the rest of the contents.
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96
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97 In general, most of the rest of the contents will be addition Lisp
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98 objects which you can examine in turn with the x... commands.
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99
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100 ** If GDB does not run and your debuggers can't load Emacs.
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101
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102 On some systems, no debugger can load Emacs with a symbol table,
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103 perhaps because they all have fixed limits on the number of symbols
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104 and Emacs exceeds the limits. Here is a method that can be used
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105 in such an extremity. Do
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106
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107 nm -n temacs > nmout
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108 strip temacs
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109 adb temacs
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110 0xd:i
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111 0xe:i
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112 14:i
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113 17:i
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114 :r -l loadup (or whatever)
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115
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116 It is necessary to refer to the file `nmout' to convert
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117 numeric addresses into symbols and vice versa.
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118
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119 It is useful to be running under a window system.
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120 Then, if Emacs becomes hopelessly wedged, you can create
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121 another window to do kill -9 in. kill -ILL is often
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122 useful too, since that may make Emacs dump core or return
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123 to adb.
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124
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125
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126 ** Debugging incorrect screen updating.
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127
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128 To debug Emacs problems that update the screen wrong, it is useful
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129 to have a record of what input you typed and what Emacs sent to the
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130 screen. To make these records, do
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131
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132 (open-dribble-file "~/.dribble")
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133 (open-termscript "~/.termscript")
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134
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135 The dribble file contains all characters read by Emacs from the
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136 terminal, and the termscript file contains all characters it sent to
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137 the terminal. The use of the directory `~/' prevents interference
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138 with any other user.
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139
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140 If you have irreproducible display problems, put those two expressions
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141 in your ~/.emacs file. When the problem happens, exit the Emacs that
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142 you were running, kill it, and rename the two files. Then you can start
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143 another Emacs without clobbering those files, and use it to examine them.