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annotate alloc.c @ 8:23c546c01f17

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fix clean target, add it_production (now default) and it_debug targets
author Henry S. Thompson <ht@inf.ed.ac.uk>
date Wed, 29 Jan 2025 18:46:57 +0000
parents 2cb46628feec
children 3bfef1f22a97
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "alloc.h"
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2 #include "error.h"
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3 extern char *malloc();
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4 extern void free();
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5
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6 #define ALIGNMENT 16 /* XXX: assuming that this alignment is enough */
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7 #define SPACE 4096 /* must be multiple of ALIGNMENT */
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8
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9 typedef union { char irrelevant[ALIGNMENT]; double d; } aligned;
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10 static aligned realspace[SPACE / ALIGNMENT];
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11 #define space ((char *) realspace)
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12 static unsigned int avail = SPACE; /* multiple of ALIGNMENT; 0<=avail<=SPACE */
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13
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14 /*@null@*//*@out@*/char *alloc(n)
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15 unsigned int n;
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16 {
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17 char *x;
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18 n = ALIGNMENT + n - (n & (ALIGNMENT - 1)); /* XXX: could overflow */
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19 if (n <= avail) { avail -= n; return space + avail; }
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20 x = malloc(n);
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21 if (!x) errno = error_nomem;
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22 return x;
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23 }
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24
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25 void alloc_free(x)
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26 char *x;
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27 {
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28 if (x >= space)
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29 if (x < space + SPACE)
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30 return; /* XXX: assuming that pointers are flat */
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31 free(x);
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32 }