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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 | 1.12 | : nalign ( addr1 n -- addr2 ) \ gforth |
| 22 : | \g @code{addr2} is the aligned version of @code{addr1} wrt the | ||
| 23 : | \g alignment @code{n}. | ||
| 24 : | anton | 1.1 | 1- tuck + swap invert and ; |
| 25 : | |||
| 26 : | anton | 1.11 | : dozerofield ( -- ) |
| 27 : | \ a field that makes no change | ||
| 28 : | \ to enable accessing the offset with "['] <field> >body @" this | ||
| 29 : | \ is not implemented with "['] noop alias" | ||
| 30 : | last @ | ||
| 31 : | if | ||
| 32 : | immediate | ||
| 33 : | then | ||
| 34 : | anton | 1.12 | does> ( name execution: -- ) |
| 35 : | anton | 1.11 | drop ; |
| 36 : | |||
| 37 : | anton | 1.12 | : field, ( align1 offset1 align size -- align2 offset2 ) |
| 38 : | anton | 1.13 | swap rot over nalign dup , ( align1 size align offset ) |
| 39 : | rot + >r nalign r> ; | ||
| 40 : | anton | 1.12 | |
| 41 : | : create-field ( align1 offset1 align size -- align2 offset2 ) | ||
| 42 : | create field, ; | ||
| 43 : | |||
| 44 : | : field ( align1 offset1 align size "name" -- align2 offset2 ) \ gforth | ||
| 45 : | anton | 1.11 | \G name execution: ( addr1 -- addr2 ) |
| 46 : | anton | 1.12 | 2 pick |
| 47 : | anton | 1.11 | if \ field offset <> 0 |
| 48 : | [IFDEF] (Field) | ||
| 49 : | (Field) | ||
| 50 : | [ELSE] | ||
| 51 : | Header reveal dofield: cfa, | ||
| 52 : | [THEN] | ||
| 53 : | else | ||
| 54 : | create dozerofield | ||
| 55 : | anton | 1.12 | then |
| 56 : | field, ; | ||
| 57 : | anton | 1.1 | |
| 58 : | anton | 1.12 | : end-struct ( align size "name" -- ) \ gforth |
| 59 : | \g @code{name} execution: @code{addr1 -- addr1+offset1}@* | ||
| 60 : | \g create a field @code{name} with offset @code{offset1}, and the type | ||
| 61 : | \g given by @code{size align}. @code{offset2} is the offset of the | ||
| 62 : | \g next field, and @code{align2} is the alignment of all fields. | ||
| 63 : | over nalign \ pad size to full alignment | ||
| 64 : | 2constant ; | ||
| 65 : | |||
| 66 : | 1 chars 0 end-struct struct ( -- align size ) \ gforth | ||
| 67 : | \g an empty structure, used to start a structure definition. | ||
| 68 : | |||
| 69 : | \ type descriptors | ||
| 70 : | 1 aligned 1 cells 2constant cell% ( -- align size ) \ gforth | ||
| 71 : | 1 chars 1 chars 2constant char% ( -- align size ) \ gforth | ||
| 72 : | 1 faligned 1 floats 2constant float% ( -- align size ) \ gforth | ||
| 73 : | 1 dfaligned 1 dfloats 2constant dfloat% ( -- align size ) \ gforth | ||
| 74 : | 1 sfaligned 1 sfloats 2constant sfloat% ( -- align size ) \ gforth | ||
| 75 : | cell% 2* 2constant double% ( -- align size ) \ gforth | ||
| 76 : | |||
| 77 : | \ memory allocation words | ||
| 78 : | ' drop alias %alignment ( align size -- align ) \ gforth | ||
| 79 : | \g the alignment of the structure | ||
| 80 : | ' nip alias %size ( align size -- size ) \ gforth | ||
| 81 : | \g the size of the structure | ||
| 82 : | |||
| 83 : | : %align ( align size -- ) \ gforth | ||
| 84 : | \G align the data space pointer to the alignment @code{align}. | ||
| 85 : | drop here swap nalign here - allot ; | ||
| 86 : | |||
| 87 : | : %allot ( align size -- addr ) \ gforth | ||
| 88 : | \g allot @code{size} address units of data space with alignment | ||
| 89 : | \g @code{align}; the resulting block of data is found at | ||
| 90 : | \g @code{addr}. | ||
| 91 : | tuck %align | ||
| 92 : | anton | 1.2 | here swap allot ; |
| 93 : | |||
| 94 : | anton | 1.12 | : %allocate ( align size -- addr ior ) \ gforth |
| 95 : | \g allocate @code{size} address units with alignment @code{align}, | ||
| 96 : | \g similar to @code{allocate}. | ||
| 97 : | nip allocate ; | ||
| 98 : | |||
| 99 : | : %alloc ( size align -- addr ) \ gforth | ||
| 100 : | \g allocate @code{size} address units with alignment @code{align}, | ||
| 101 : | \g giving a data block at @code{addr}; @code{throw}s an ior code | ||
| 102 : | \g if not successful. | ||
| 103 : | %allocate throw ; |
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