1 /* Runtime types. 2 3 Copyright (C) 2015-2019, 2021 Paul Boddie <paul@boddie.org.uk> 4 5 This program is free software; you can redistribute it and/or modify it under 6 the terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3 of the License, or (at your option) any later 8 version. 9 10 This program is distributed in the hope that it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 12 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 13 details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #ifndef __TYPES_H__ 20 #define __TYPES_H__ 21 22 /* Define code and position types, populated by enum values defined for each 23 program specifically. */ 24 25 #include <stdint.h> 26 #include <stdlib.h> 27 28 /* Include the special instance position value. The pos member of __obj refers 29 to the special type attribute for classes, indicating which position holds 30 the attribute describing the class type. For instances, it is set to the same 31 attribute position as __class__ and is defined in the following file. */ 32 33 #include "instancepos.h" 34 35 typedef uint16_t __code; 36 typedef uint16_t __pos; 37 typedef uint16_t __pcode; 38 typedef uint16_t __ppos; 39 40 /* Attribute tables are lists of codes confirming the presence of attributes. */ 41 42 typedef struct __table 43 { 44 const __pos size; 45 const __code attrs[]; 46 } __table; 47 48 /* Parameter tables are lists of codes confirming the presence of parameters, as 49 well as the positions of those parameters in the list for a given function. 50 */ 51 52 typedef struct __param 53 { 54 __code code; 55 __pos pos; 56 } __param; 57 58 typedef struct __ptable 59 { 60 const __ppos min, max, size; 61 const __param params[]; 62 } __ptable; 63 64 /* Attributes are values referring to objects or encoding other information. 65 Objects are collections of attributes. 66 Object references are references to tables and collections of attributes. 67 Attribute references are references to single attributes. */ 68 69 typedef struct __obj __obj; 70 typedef struct __fragment __fragment; 71 typedef union __attr __attr; 72 typedef __obj * __ref; 73 74 /* Introduce an integer type that is interoperable with the size type. */ 75 76 typedef ssize_t __int; 77 78 /* Attribute value interpretations. */ 79 80 typedef union __attr 81 { 82 /* General attribute members. */ 83 84 __ref value; /* attribute value */ 85 __int intvalue; /* integer value data (shifted value, tagged) */ 86 87 /* Special case attribute members. */ 88 89 const __ptable * ptable; /* parameter table */ 90 struct { 91 __pcode code; /* parameter table code for key */ 92 __ppos pos; /* parameter table position for key */ 93 }; 94 __attr (*fn)(); /* callable details */ 95 float floatvalue; /* floating point value */ 96 char * strvalue; /* string value */ 97 __fragment * seqvalue; /* sequence data */ 98 void * datavalue; /* object-specific data */ 99 __int sizevalue; /* object-specific size */ 100 } __attr; 101 102 typedef struct __obj 103 { 104 const __table * table; /* attribute table */ 105 __ppos pos; /* position of attribute indicating class */ 106 __attr attrs[]; /* attributes */ 107 } __obj; 108 109 #define __INSTANCE_SIZE(NUMBER) ((NUMBER) * sizeof(__attr) + sizeof(__table *) + sizeof(__ppos)) 110 111 /* Fragments are simple collections of attributes employed by sequence types. 112 They provide the basis of lists and tuples. */ 113 114 typedef struct __fragment 115 { 116 __int size, capacity; 117 __attr attrs[]; 118 } __fragment; 119 120 #define __FRAGMENT_SIZE(NUMBER) ((NUMBER) * sizeof(__attr) + 2 * sizeof(__int)) 121 122 /* Attribute interpretation. */ 123 124 #define __NUM_TAG_BITS 2 125 #define __TAG_INT 0b01 126 #define __TAG_MASK 0b11 127 #define __INTEGER(ATTR) (((ATTR).intvalue & __TAG_MASK) == __TAG_INT) 128 129 /* Attribute value setting. */ 130 131 #define __ATTRVALUE(VALUE) ((__attr) {.value=(__ref) VALUE}) 132 #define __NULL __ATTRVALUE(0) 133 #define __SETNULL(ATTR) ((ATTR).value = 0) 134 135 /* Attribute as instance setting. */ 136 137 #define __INTVALUE(VALUE) ((__attr) {.intvalue=(((__int) VALUE) << __NUM_TAG_BITS) | __TAG_INT}) 138 #define __TOINT(ATTR) ((ATTR).intvalue >> __NUM_TAG_BITS) 139 #define __MAXINT ((((__int) 1) << ((sizeof(__int) * 8) - 1 - __NUM_TAG_BITS)) - 1) 140 #define __MININT (-(((__int) 1) << ((sizeof(__int) * 8) - 1 - __NUM_TAG_BITS))) 141 142 /* Argument lists. */ 143 144 #define __ARGS(...) ((__attr[]) {__VA_ARGS__}) 145 #define __KWARGS(...) ((__param[]) {__VA_ARGS__}) 146 147 /* Attribute codes and positions for attribute names. */ 148 149 #define __ATTRCODE(ATTRNAME) __code_##ATTRNAME 150 #define __ATTRPOS(ATTRNAME) __pos_##ATTRNAME 151 #define __PARAMCODE(PARAMNAME) __pcode_##PARAMNAME 152 #define __PARAMPOS(PARAMNAME) __ppos_##PARAMNAME 153 154 #endif /* __TYPES_H__ */