Mercurial > hg > xemacs-beta
annotate src/lisp-disunion.h @ 5518:3cc7470ea71c
gnuclient: if TMPDIR was set and connect failed, try again with /tmp
2011-06-03 Aidan Kehoe <kehoea@parhasard.net>
* gnuslib.c (connect_to_unix_server):
Retry with /tmp as a directory in which to search for Unix sockets
if an attempt to connect with some other directory failed (which
may be because gnuclient and gnuserv don't share an environment
value for TMPDIR, or because gnuserv was compiled with USE_TMPDIR
turned off).
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Fri, 03 Jun 2011 18:40:57 +0100 |
| parents | 308d34e9f07d |
| children | 56144c8593a8 |
| rev | line source |
|---|---|
| 428 | 1 /* Fundamental definitions for XEmacs Lisp interpreter -- non-union objects. |
| 2 Copyright (C) 1985, 1986, 1987, 1992, 1993 Free Software Foundation, Inc. | |
| 826 | 3 Copyright (C) 2001, 2002 Ben Wing. |
| 428 | 4 |
| 5 This file is part of XEmacs. | |
| 6 | |
|
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7 XEmacs is free software: you can redistribute it and/or modify it |
| 428 | 8 under the terms of the GNU General Public License as published by the |
|
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9 Free Software Foundation, either version 3 of the License, or (at your |
|
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10 option) any later version. |
| 428 | 11 |
| 12 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
|
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18 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 19 |
| 20 /* Synched up with: FSF 19.30. Split out from lisp.h. */ | |
| 21 /* This file has diverged greatly from FSF Emacs. Syncing is no | |
| 22 longer desirable or possible */ | |
| 23 | |
| 24 /* | |
| 25 Format of a non-union-type Lisp Object | |
| 26 | |
| 27 3 2 1 0 | |
| 28 bit 10987654321098765432109876543210 | |
| 29 -------------------------------- | |
| 30 VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVTT | |
| 31 | |
| 32 Integers are treated specially, and look like this: | |
| 33 | |
| 34 3 2 1 0 | |
| 35 bit 10987654321098765432109876543210 | |
| 36 -------------------------------- | |
| 37 VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVT | |
| 38 | |
| 39 For integral Lisp types, i.e. integers and characters, the value | |
| 458 | 40 bits are the Lisp object. Some people call such Lisp_Objects "immediate". |
| 428 | 41 |
| 458 | 42 The object is obtained by masking off the type bits. |
| 462 | 43 Bit 1 is used as a value bit by splitting the Lisp integer type |
| 458 | 44 into two subtypes, Lisp_Type_Int_Even and Lisp_Type_Int_Odd. |
| 45 By this trickery we get 31 bits for integers instead of 30. | |
| 428 | 46 |
| 47 For non-integral types, the value bits of a Lisp_Object contain | |
| 48 a pointer to a structure containing the object. The pointer is | |
| 49 obtained by masking off the type and mark bits. | |
| 50 | |
| 462 | 51 All pointer-based types are coalesced under a single type called |
| 458 | 52 Lisp_Type_Record. The type bits for this type are required by the |
| 53 implementation to be 00, just like the least significant bits of | |
| 54 word-aligned struct pointers on 32-bit hardware. This requires that | |
| 55 all structs implementing Lisp_Objects have an alignment of at least 4 | |
| 56 bytes. Because of this, Lisp_Object pointers don't have to be masked | |
| 57 and are full-sized. | |
| 428 | 58 |
| 458 | 59 There are no mark bits in the Lisp_Object itself (there used to be). |
| 60 | |
| 61 Integers and characters don't need to be marked. All other types are | |
| 62 lrecord-based, which means they get marked by setting the mark bit in | |
| 63 the struct lrecord_header. | |
| 428 | 64 |
| 65 Here is a brief description of the following macros: | |
| 66 | |
| 67 XTYPE The type bits of a Lisp_Object | |
| 68 XPNTRVAL The value bits of a Lisp_Object storing a pointer | |
| 867 | 69 XCHARVAL The value bits of a Lisp_Object storing a Ichar |
| 428 | 70 XREALINT The value bits of a Lisp_Object storing an integer, signed |
| 71 XUINT The value bits of a Lisp_Object storing an integer, unsigned | |
| 458 | 72 INTP Non-zero if this Lisp_Object is an integer |
| 428 | 73 Qzero Lisp Integer 0 |
| 458 | 74 EQ Non-zero if two Lisp_Objects are identical, not merely equal. */ |
| 428 | 75 |
| 76 | |
| 77 typedef EMACS_INT Lisp_Object; | |
| 78 | |
| 79 #define Lisp_Type_Int_Bit (Lisp_Type_Int_Even & Lisp_Type_Int_Odd) | |
| 80 #define VALMASK (((1UL << VALBITS) - 1UL) << GCTYPEBITS) | |
| 81 #define XTYPE(x) ((enum Lisp_Type) (((EMACS_UINT)(x)) & ~VALMASK)) | |
| 82 #define XPNTRVAL(x) (x) /* This depends on Lisp_Type_Record == 0 */ | |
| 83 #define XCHARVAL(x) ((x) >> GCBITS) | |
| 84 #define XREALINT(x) ((x) >> INT_GCBITS) | |
| 85 #define XUINT(x) ((EMACS_UINT)(x) >> INT_GCBITS) | |
| 826 | 86 |
| 87 #define wrap_pointer_1(ptr) ((Lisp_Object) (ptr)) | |
| 88 | |
| 89 DECLARE_INLINE_HEADER ( | |
| 90 Lisp_Object | |
| 91 make_int_verify (EMACS_INT val) | |
| 92 ) | |
| 93 { | |
| 94 Lisp_Object obj = (Lisp_Object) ((val << INT_GCBITS) | Lisp_Type_Int_Bit); | |
| 95 type_checking_assert (XREALINT (obj) == val); | |
| 96 return obj; | |
| 97 } | |
| 98 | |
| 99 #define make_int(x) ((Lisp_Object) (((x) << INT_GCBITS) | Lisp_Type_Int_Bit)) | |
| 100 | |
| 831 | 101 #define make_char_1(x) ((Lisp_Object) (((x) << GCBITS) | Lisp_Type_Char)) |
| 826 | 102 |
| 428 | 103 #define INTP(x) ((EMACS_UINT)(x) & Lisp_Type_Int_Bit) |
| 104 #define INT_PLUS(x,y) ((x)+(y)-Lisp_Type_Int_Bit) | |
| 105 #define INT_MINUS(x,y) ((x)-(y)+Lisp_Type_Int_Bit) | |
| 106 #define INT_PLUS1(x) INT_PLUS (x, make_int (1)) | |
| 107 #define INT_MINUS1(x) INT_MINUS (x, make_int (1)) | |
| 108 | |
| 109 #define Qzero make_int (0) | |
| 110 #define Qnull_pointer ((Lisp_Object) 0) | |
| 111 #define EQ(x,y) ((x) == (y)) | |
| 112 | |
| 853 | 113 /* WARNING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
| 114 | |
| 5013 | 115 You can only GET_LISP_FROM_VOID something that had previously been |
| 116 STORE_LISP_IN_VOID'd. If you want to go the other way, use | |
| 117 STORE_VOID_IN_LISP and GET_VOID_FROM_LISP, or use make_opaque_ptr(). */ | |
| 853 | 118 |
| 5013 | 119 /* Convert a Lisp object to a void * pointer, as when it needs to be passed |
| 120 to a toolkit callback function */ | |
| 121 #define STORE_LISP_IN_VOID(larg) ((void *) (larg)) | |
| 122 | |
| 123 /* Convert a void * pointer back into a Lisp object, assuming that the | |
| 124 pointer was generated by STORE_LISP_IN_VOID. */ | |
| 125 #define GET_LISP_FROM_VOID(varg) ((Lisp_Object) (varg)) | |
| 428 | 126 |
| 127 /* Convert a Lisp_Object into something that can't be used as an | |
| 128 lvalue. Useful for type-checking. */ | |
| 129 #define NON_LVALUE(larg) ((larg) + 0) |