a68g-mem.c
1 //! @file a68g-mem.c
2 //! @author J. Marcel van der Veer
3
4 //! @section Copyright
5 //!
6 //! This file is part of Algol68G - an Algol 68 compiler-interpreter.
7 //! Copyright 2001-2025 J. Marcel van der Veer [algol68g@xs4all.nl].
8
9 //! @section License
10 //!
11 //! This program is free software; you can redistribute it and/or modify it
12 //! under the terms of the GNU General Public License as published by the
13 //! Free Software Foundation; either version 3 of the License, or
14 //! (at your option) any later version.
15 //!
16 //! This program is distributed in the hope that it will be useful, but
17 //! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
18 //! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 //! more details. You should have received a copy of the GNU General Public
20 //! License along with this program. If not, see [http://www.gnu.org/licenses/].
21
22 //! @section Synopsis
23 //!
24 //! Low-level memory management.
25
26 #include "a68g.h"
27 #include "a68g-prelude.h"
28
29 //! @brief Initialise C and A68 heap management.
30
31 void init_heap (void)
32 {
33 unt heap_a_size = A68_ALIGN (A68 (heap_size));
34 unt handle_a_size = A68_ALIGN (A68 (handle_pool_size));
35 unt frame_a_size = A68_ALIGN (A68 (frame_stack_size));
36 unt expr_a_size = A68_ALIGN (A68 (expr_stack_size));
37 REAL_T /* sic */ total_size = A68_ALIGN (heap_a_size + handle_a_size + frame_a_size + 2 * expr_a_size);
38 ABEND (OVER_2G (total_size), ERROR_OVER_2G, __func__);
39 errno = 0;
40 BYTE_T *core = (BYTE_T *) (A68_ALIGN_T *) a68_alloc ((size_t) total_size, __func__, __LINE__);
41 ABEND (core == NO_BYTE, ERROR_OUT_OF_CORE, __func__);
42 A68_HEAP = NO_BYTE;
43 A68_HANDLES = NO_BYTE;
44 A68_STACK = NO_BYTE;
45 A68_SP = 0;
46 A68_FP = 0;
47 A68_HP = 0;
48 A68_GLOBALS = 0;
49 A68_HEAP = &(core[0]);
50 A68_HANDLES = &(A68_HEAP[heap_a_size]);
51 A68_STACK = &(A68_HANDLES[handle_a_size]);
52 A68 (fixed_heap_pointer) = A68_ALIGNMENT;
53 A68 (temp_heap_pointer) = total_size;
54 A68 (frame_start) = 0;
55 A68 (frame_end) = A68 (stack_start) = A68 (frame_start) + frame_a_size;
56 A68 (stack_end) = A68 (stack_start) + expr_a_size;
57 ABEND (errno != 0, ERROR_ALLOCATION, __func__);
58 }
59
60 //! @brief aligned allocation.
61
62 void *a68_alloc (size_t len, const char *f, int line)
63 {
64 // We need this since malloc aligns to "standard C types".
65 // __float128 is not a standard type, apparently ...
66 // Huge chunks cause trouble!
67 ABEND (len >= 2 * GIGABYTE, ERROR_OUT_OF_CORE, __func__);
68 if (len > 0) {
69 void *p = NULL;
70 int save = errno;
71 size_t align = sizeof (A68_ALIGN_T);
72 errno = 0;
73 #if defined (BUILD_WIN32)
74 p = _aligned_malloc (len, align);
75 #elif defined (HAVE_POSIX_MEMALIGN)
76 errno = posix_memalign (&p, align, len);
77 if (errno != 0) {
78 p = NULL;
79 }
80 #elif defined (HAVE_ALIGNED_ALLOC)
81 // Glibc version of posix_memalign.
82 if (align < sizeof (void *)) {
83 errno = EINVAL;
84 } else {
85 p = aligned_alloc (align, len);
86 }
87 #else
88 // Aude audenda.
89 p = malloc (len);
90 #endif
91 if (p == (void *) NULL || errno != 0) {
92 static BUFFER msg;
93 a68_bufprt (msg, SNPRINTF_SIZE, "cannot allocate %lu bytes; called from function %s, line %d", (long unt) len, f, line);
94 ABEND (A68_TRUE, ERROR_ALLOCATION, msg);
95 }
96 errno = save;
97 return p;
98 } else {
99 return (void *) NULL;
100 }
101 }
102
103 void a68_free (void *z)
104 {
105 if (z != NULL) {
106 #if defined (BUILD_WIN32)
107 // On WIN32, free cannot deallocate _aligned_malloc
108 _aligned_free (z);
109 #else
110 free (z);
111 #endif
112 }
113 }
114
115 //! @brief Give pointer to block of "s" bytes.
116
117 BYTE_T *get_heap_space (size_t s)
118 {
119 ABEND (s == 0, ERROR_INVALID_SIZE, __func__);
120 BYTE_T *z = (BYTE_T *) (A68_ALIGN_T *) a68_alloc (A68_ALIGN (s), __func__, __LINE__);
121 ABEND (z == NO_BYTE, ERROR_OUT_OF_CORE, __func__);
122 return z;
123 }
124
125 //! @brief Make a new copy of concatenated strings.
126
127 char *new_string (char *t, ...)
128 {
129 va_list vl;
130 va_start (vl, t);
131 char *q = t;
132 if (q == NO_TEXT) {
133 va_end (vl);
134 return NO_TEXT;
135 }
136 int len = 0;
137 while (q != NO_TEXT) {
138 len += (int) strlen (q);
139 q = va_arg (vl, char *);
140 }
141 va_end (vl);
142 len++;
143 char *z = (char *) get_heap_space ((size_t) len);
144 z[0] = NULL_CHAR;
145 q = t;
146 va_start (vl, t);
147 while (q != NO_TEXT) {
148 a68_bufcat (z, q, len);
149 q = va_arg (vl, char *);
150 }
151 va_end (vl);
152 return z;
153 }
154
155 //! @brief Make a new copy of "t".
156
157 char *new_fixed_string (char *t)
158 {
159 int n = (int) (strlen (t) + 1);
160 char *z = (char *) get_fixed_heap_space ((size_t) n);
161 a68_bufcpy (z, t, n);
162 return z;
163 }
164
165 //! @brief Make a new copy of "t".
166
167 char *new_temp_string (char *t)
168 {
169 int n = (int) (strlen (t) + 1);
170 char *z = (char *) get_temp_heap_space ((size_t) n);
171 a68_bufcpy (z, t, n);
172 return z;
173 }
174
175 //! @brief Get (preferably fixed) heap space.
176
177 BYTE_T *get_fixed_heap_space (size_t s)
178 {
179 if (A68 (heap_is_fluid)) {
180 BYTE_T *z = HEAP_ADDRESS (A68 (fixed_heap_pointer));
181 A68 (fixed_heap_pointer) += A68_ALIGN ((int) s);
182 // Allow for extra storage for diagnostics etcetera
183 ABEND (A68 (fixed_heap_pointer) >= (A68 (heap_size) - MIN_MEM_SIZE), ERROR_OUT_OF_CORE, __func__);
184 ABEND (((unt) A68 (temp_heap_pointer) - (unt) A68 (fixed_heap_pointer)) <= MIN_MEM_SIZE, ERROR_OUT_OF_CORE, __func__);
185 return z;
186 } else {
187 return get_heap_space (s);
188 }
189 }
190
191 //! @brief Get (preferably temporary) heap space.
192
193 BYTE_T *get_temp_heap_space (size_t s)
194 {
195 if (A68 (heap_is_fluid)) {
196 A68 (temp_heap_pointer) -= A68_ALIGN ((int) s);
197 // Allow for extra storage for diagnostics etcetera.
198 ABEND (((unt) A68 (temp_heap_pointer) - (unt) A68 (fixed_heap_pointer)) <= MIN_MEM_SIZE, ERROR_OUT_OF_CORE, __func__);
199 return HEAP_ADDRESS (A68 (temp_heap_pointer));
200 } else {
201 return get_heap_space (s);
202 }
203 }
204
205 //! @brief Get size of stack segment.
206
207 void get_stack_size (void)
208 {
209 #if defined (BUILD_WIN32)
210 A68 (stack_size) = MEGABYTE; // Guestimate
211 #else
212 errno = 0;
213 // Some systems do not implement RLIMIT_STACK so if getrlimit fails, we do not abend.
214 struct rlimit limits;
215 if (!(getrlimit (RLIMIT_STACK, &limits) == 0 && errno == 0)) {
216 A68 (stack_size) = MEGABYTE;
217 }
218 A68 (stack_size) = (unt) (RLIM_CUR (&limits) < RLIM_MAX (&limits) ? RLIM_CUR (&limits) : RLIM_MAX (&limits));
219 // A heuristic in case getrlimit yields extreme numbers: the frame stack is
220 // assumed to fill at a rate comparable to the C stack, so the C stack needs
221 // not be larger than the frame stack. This may not be true.
222 if (A68 (stack_size) < KILOBYTE || (A68 (stack_size) > 96 * MEGABYTE && A68 (stack_size) > A68 (frame_stack_size))) {
223 A68 (stack_size) = A68 (frame_stack_size);
224 }
225 #endif
226 A68 (stack_limit) = (A68 (stack_size) > (4 * A68 (storage_overhead)) ? (A68 (stack_size) - A68 (storage_overhead)) : A68 (stack_size) / 2);
227 }
228
229 //! @brief Free heap allocated by genie.
230
231 void genie_free (NODE_T * p)
232 {
233 for (; p != NO_NODE; FORWARD (p)) {
234 genie_free (SUB (p));
235 if (GINFO (p) != NO_GINFO) {
236 a68_free (CONSTANT (GINFO (p)));
237 CONSTANT (GINFO (p)) = NO_CONSTANT;
238 a68_free (COMPILE_NAME (GINFO (p)));
239 COMPILE_NAME (GINFO (p)) = NO_TEXT;
240 }
241 }
242 }
243
244 //! @brief Free heap allocated by genie.
245
246 void free_syntax_tree (NODE_T * p)
247 {
248 for (; p != NO_NODE; FORWARD (p)) {
249 free_syntax_tree (SUB (p));
250 a68_free (NPRAGMENT (p));
251 NPRAGMENT (p) = NO_TEXT;
252 DIAGNOSTIC_T *d = DIAGNOSTICS (LINE (INFO (p)));
253 while (d != NO_DIAGNOSTIC) {
254 a68_free (TEXT (d));
255 DIAGNOSTIC_T *stale = d;
256 FORWARD (d);
257 a68_free (stale);
258 }
259 DIAGNOSTICS (LINE (INFO (p))) = NO_DIAGNOSTIC;
260 }
261 }
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© 2002-2025 J.M. van der Veer (jmvdveer@xs4all.nl)
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