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| 1 : | anton | 1.8 | \ data structures (like C structs) |
| 2 : | |||
| 3 : | anton | 1.11 | \ Copyright (C) 1995, 1997 Free Software Foundation, Inc. |
| 4 : | anton | 1.8 | |
| 5 : | \ This file is part of Gforth. | ||
| 6 : | |||
| 7 : | \ Gforth is free software; you can redistribute it and/or | ||
| 8 : | \ modify it under the terms of the GNU General Public License | ||
| 9 : | \ as published by the Free Software Foundation; either version 2 | ||
| 10 : | \ of the License, or (at your option) any later version. | ||
| 11 : | |||
| 12 : | \ This program is distributed in the hope that it will be useful, | ||
| 13 : | \ but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 : | \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 15 : | \ GNU General Public License for more details. | ||
| 16 : | |||
| 17 : | \ You should have received a copy of the GNU General Public License | ||
| 18 : | \ along with this program; if not, write to the Free Software | ||
| 19 : | \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| 20 : | |||
| 21 : | anton | 1.14 | : naligned ( addr1 n -- addr2 ) \ gforth |
| 22 : | crook | 1.15 | \g @var{addr2} is the aligned version of @var{addr1} with respect to the |
| 23 : | \g alignment @var{n}. | ||
| 24 : | anton | 1.1 | 1- tuck + swap invert and ; |
| 25 : | anton | 1.14 | |
| 26 : | ' naligned alias nalign \ old name, obsolete | ||
| 27 : | anton | 1.1 | |
| 28 : | anton | 1.11 | : dozerofield ( -- ) |
| 29 : | \ a field that makes no change | ||
| 30 : | \ to enable accessing the offset with "['] <field> >body @" this | ||
| 31 : | \ is not implemented with "['] noop alias" | ||
| 32 : | last @ | ||
| 33 : | if | ||
| 34 : | immediate | ||
| 35 : | then | ||
| 36 : | anton | 1.12 | does> ( name execution: -- ) |
| 37 : | anton | 1.11 | drop ; |
| 38 : | |||
| 39 : | anton | 1.12 | : field, ( align1 offset1 align size -- align2 offset2 ) |
| 40 : | anton | 1.13 | swap rot over nalign dup , ( align1 size align offset ) |
| 41 : | rot + >r nalign r> ; | ||
| 42 : | anton | 1.12 | |
| 43 : | : create-field ( align1 offset1 align size -- align2 offset2 ) | ||
| 44 : | create field, ; | ||
| 45 : | |||
| 46 : | : field ( align1 offset1 align size "name" -- align2 offset2 ) \ gforth | ||
| 47 : | anton | 1.16 | \g Create a field @var{name} with offset @var{offset1}, and the type |
| 48 : | \g given by @var{align size}. @var{offset2} is the offset of the | ||
| 49 : | \g next field, and @var{align2} is the alignment of all fields.@* | ||
| 50 : | \g @code{name} execution: @var{addr1} -- @var{addr2}.@* | ||
| 51 : | \g @var{addr2}=@var{addr1}+@var{offset1} | ||
| 52 : | anton | 1.12 | 2 pick |
| 53 : | anton | 1.11 | if \ field offset <> 0 |
| 54 : | [IFDEF] (Field) | ||
| 55 : | (Field) | ||
| 56 : | [ELSE] | ||
| 57 : | Header reveal dofield: cfa, | ||
| 58 : | [THEN] | ||
| 59 : | else | ||
| 60 : | create dozerofield | ||
| 61 : | anton | 1.12 | then |
| 62 : | field, ; | ||
| 63 : | anton | 1.1 | |
| 64 : | anton | 1.12 | : end-struct ( align size "name" -- ) \ gforth |
| 65 : | anton | 1.16 | \g Define a structure/type descriptor @var{name} with alignment |
| 66 : | \g @var{align} and size @var{size1} (@var{size} rounded up to be a | ||
| 67 : | \g multiple of @var{align}).@* | ||
| 68 : | \g @code{name} execution: -- @var{align size1}@* | ||
| 69 : | anton | 1.12 | over nalign \ pad size to full alignment |
| 70 : | 2constant ; | ||
| 71 : | |||
| 72 : | 1 chars 0 end-struct struct ( -- align size ) \ gforth | ||
| 73 : | crook | 1.15 | \g An empty structure, used to start a structure definition. |
| 74 : | anton | 1.12 | |
| 75 : | \ type descriptors | ||
| 76 : | 1 aligned 1 cells 2constant cell% ( -- align size ) \ gforth | ||
| 77 : | 1 chars 1 chars 2constant char% ( -- align size ) \ gforth | ||
| 78 : | 1 faligned 1 floats 2constant float% ( -- align size ) \ gforth | ||
| 79 : | 1 dfaligned 1 dfloats 2constant dfloat% ( -- align size ) \ gforth | ||
| 80 : | 1 sfaligned 1 sfloats 2constant sfloat% ( -- align size ) \ gforth | ||
| 81 : | cell% 2* 2constant double% ( -- align size ) \ gforth | ||
| 82 : | |||
| 83 : | \ memory allocation words | ||
| 84 : | ' drop alias %alignment ( align size -- align ) \ gforth | ||
| 85 : | crook | 1.15 | \g The alignment of the structure. |
| 86 : | anton | 1.12 | ' nip alias %size ( align size -- size ) \ gforth |
| 87 : | crook | 1.15 | \g The size of the structure. |
| 88 : | anton | 1.12 | |
| 89 : | : %align ( align size -- ) \ gforth | ||
| 90 : | crook | 1.15 | \G Align the data space pointer to the alignment @var{align}. |
| 91 : | anton | 1.12 | drop here swap nalign here - allot ; |
| 92 : | |||
| 93 : | : %allot ( align size -- addr ) \ gforth | ||
| 94 : | crook | 1.15 | \g Allot @var{size} address units of data space with alignment |
| 95 : | \g @var{align}; the resulting block of data is found at | ||
| 96 : | \g @var{addr}. | ||
| 97 : | anton | 1.12 | tuck %align |
| 98 : | anton | 1.2 | here swap allot ; |
| 99 : | |||
| 100 : | anton | 1.12 | : %allocate ( align size -- addr ior ) \ gforth |
| 101 : | crook | 1.15 | \g Allocate @var{size} address units with alignment @var{align}, |
| 102 : | anton | 1.12 | \g similar to @code{allocate}. |
| 103 : | nip allocate ; | ||
| 104 : | |||
| 105 : | : %alloc ( size align -- addr ) \ gforth | ||
| 106 : | crook | 1.15 | \g Allocate @var{size} address units with alignment @var{align}, |
| 107 : | \g giving a data block at @var{addr}; @code{throw} an ior code | ||
| 108 : | anton | 1.12 | \g if not successful. |
| 109 : | %allocate throw ; |
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