summaryrefslogtreecommitdiff
path: root/storage/innobase/mem/mem0mem.cc
blob: a5b5c9e0f8468cfd9d8e50d4130cd03c8b6287e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
/*****************************************************************************

Copyright (c) 1994, 2014, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, MariaDB Corporation.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA

*****************************************************************************/

/********************************************************************//**
@file mem/mem0mem.cc
The memory management

Created 6/9/1994 Heikki Tuuri
*************************************************************************/

#include "ha_prototypes.h"

#include "mem0mem.h"
#include "buf0buf.h"
#include "srv0srv.h"
#include <stdarg.h>

/** Duplicates a NUL-terminated string, allocated from a memory heap.
@param[in]	heap,	memory heap where string is allocated
@param[in]	str)	string to be copied
@return own: a copy of the string */
char*
mem_heap_strdup(
	mem_heap_t*	heap,
	const char*	str)
{
	return(static_cast<char*>(mem_heap_dup(heap, str, strlen(str) + 1)));
}

/**********************************************************************//**
Duplicate a block of data, allocated from a memory heap.
@return own: a copy of the data */
void*
mem_heap_dup(
/*=========*/
	mem_heap_t*	heap,	/*!< in: memory heap where copy is allocated */
	const void*	data,	/*!< in: data to be copied */
	ulint		len)	/*!< in: length of data, in bytes */
{
	return(memcpy(mem_heap_alloc(heap, len), data, len));
}

/**********************************************************************//**
Concatenate two strings and return the result, using a memory heap.
@return own: the result */
char*
mem_heap_strcat(
/*============*/
	mem_heap_t*	heap,	/*!< in: memory heap where string is allocated */
	const char*	s1,	/*!< in: string 1 */
	const char*	s2)	/*!< in: string 2 */
{
	char*	s;
	ulint	s1_len = strlen(s1);
	ulint	s2_len = strlen(s2);

	s = static_cast<char*>(mem_heap_alloc(heap, s1_len + s2_len + 1));

	memcpy(s, s1, s1_len);
	memcpy(s + s1_len, s2, s2_len);

	s[s1_len + s2_len] = '\0';

	return(s);
}


/****************************************************************//**
Helper function for mem_heap_printf.
@return length of formatted string, including terminating NUL */
static
ulint
mem_heap_printf_low(
/*================*/
	char*		buf,	/*!< in/out: buffer to store formatted string
				in, or NULL to just calculate length */
	const char*	format,	/*!< in: format string */
	va_list		ap)	/*!< in: arguments */
{
	ulint 		len = 0;

	while (*format) {

		/* Does this format specifier have the 'l' length modifier. */
		ibool	is_long = FALSE;

		/* Length of one parameter. */
		size_t	plen;

		if (*format++ != '%') {
			/* Non-format character. */

			len++;

			if (buf) {
				*buf++ = *(format - 1);
			}

			continue;
		}

		if (*format == 'l') {
			is_long = TRUE;
			format++;
		}

		switch (*format++) {
		case 's':
			/* string */
			{
				char*	s = va_arg(ap, char*);

				/* "%ls" is a non-sensical format specifier. */
				ut_a(!is_long);

				plen = strlen(s);
				len += plen;

				if (buf) {
					memcpy(buf, s, plen);
					buf += plen;
				}
			}

			break;

		case 'u':
			/* unsigned int */
			{
				char		tmp[32];
				unsigned long	val;

				/* We only support 'long' values for now. */
				ut_a(is_long);

				val = va_arg(ap, unsigned long);

				plen = sprintf(tmp, "%lu", val);
				len += plen;

				if (buf) {
					memcpy(buf, tmp, plen);
					buf += plen;
				}
			}

			break;

		case '%':

			/* "%l%" is a non-sensical format specifier. */
			ut_a(!is_long);

			len++;

			if (buf) {
				*buf++ = '%';
			}

			break;

		default:
			ut_error;
		}
	}

	/* For the NUL character. */
	len++;

	if (buf) {
		*buf = '\0';
	}

	return(len);
}

/****************************************************************//**
A simple sprintf replacement that dynamically allocates the space for the
formatted string from the given heap. This supports a very limited set of
the printf syntax: types 's' and 'u' and length modifier 'l' (which is
required for the 'u' type).
@return heap-allocated formatted string */
char*
mem_heap_printf(
/*============*/
	mem_heap_t*	heap,	/*!< in: memory heap */
	const char*	format,	/*!< in: format string */
	...)
{
	va_list		ap;
	char*		str;
	ulint 		len;

	/* Calculate length of string */
	len = 0;
	va_start(ap, format);
	len = mem_heap_printf_low(NULL, format, ap);
	va_end(ap);

	/* Now create it for real. */
	str = static_cast<char*>(mem_heap_alloc(heap, len));
	va_start(ap, format);
	mem_heap_printf_low(str, format, ap);
	va_end(ap);

	return(str);
}

#ifdef UNIV_DEBUG
/** Validates the contents of a memory heap.
Checks a memory heap for consistency, prints the contents if any error
is detected. A fatal error is logged if an error is detected.
@param[in]	heap	Memory heap to validate. */
void
mem_heap_validate(
	const mem_heap_t*	heap)
{
	ulint	size = 0;

	for (const mem_block_t* block = heap;
		block != NULL;
		block = UT_LIST_GET_NEXT(list, block)) {

		mem_block_validate(block);

		switch (block->type) {
		case MEM_HEAP_DYNAMIC:
			break;
		case MEM_HEAP_BUFFER:
		case MEM_HEAP_BUFFER | MEM_HEAP_BTR_SEARCH:
			ut_ad(block->len <= UNIV_PAGE_SIZE);
			break;
		default:
			ut_error;
		}

		size += block->len;
	}

	ut_ad(size == heap->total_size);
}
#endif /* UNIV_DEBUG */

/***************************************************************//**
Creates a memory heap block where data can be allocated.
@return own: memory heap block, NULL if did not succeed (only possible
for MEM_HEAP_BTR_SEARCH type heaps) */
mem_block_t*
mem_heap_create_block_func(
/*=======================*/
	mem_heap_t*	heap,	/*!< in: memory heap or NULL if first block
				should be created */
	ulint		n,	/*!< in: number of bytes needed for user data */
#ifdef UNIV_DEBUG
	const char*	file_name,/*!< in: file name where created */
	unsigned	line,	/*!< in: line where created */
#endif /* UNIV_DEBUG */
	ulint		type)	/*!< in: type of heap: MEM_HEAP_DYNAMIC or
				MEM_HEAP_BUFFER */
{
	buf_block_t*	buf_block = NULL;
	mem_block_t*	block;
	ulint		len;

	ut_ad((type == MEM_HEAP_DYNAMIC) || (type == MEM_HEAP_BUFFER)
	      || (type == MEM_HEAP_BUFFER + MEM_HEAP_BTR_SEARCH));

	if (heap != NULL) {
		mem_block_validate(heap);
		ut_d(mem_heap_validate(heap));
	}

	/* In dynamic allocation, calculate the size: block header + data. */
	len = MEM_BLOCK_HEADER_SIZE + MEM_SPACE_NEEDED(n);

	if (type == MEM_HEAP_DYNAMIC || len < UNIV_PAGE_SIZE / 2) {

		ut_ad(type == MEM_HEAP_DYNAMIC || n <= MEM_MAX_ALLOC_IN_BUF);

		block = static_cast<mem_block_t*>(ut_malloc_nokey(len));
	} else {
		len = UNIV_PAGE_SIZE;

		if ((type & MEM_HEAP_BTR_SEARCH) && heap) {
			/* We cannot allocate the block from the
			buffer pool, but must get the free block from
			the heap header free block field */

			buf_block = static_cast<buf_block_t*>(heap->free_block);
			heap->free_block = NULL;

			if (UNIV_UNLIKELY(!buf_block)) {

				return(NULL);
			}
		} else {
			buf_block = buf_block_alloc(NULL);
		}

		block = (mem_block_t*) buf_block->frame;
	}

	if (block == NULL) {
		ib::fatal() << "Unable to allocate memory of size "
			<< len << ".";
	}

	block->buf_block = buf_block;
	block->free_block = NULL;

	block->magic_n = MEM_BLOCK_MAGIC_N;
	ut_d(ut_strlcpy_rev(block->file_name, file_name,
			    sizeof(block->file_name)));
	ut_d(block->line = line);

	mem_block_set_len(block, len);
	mem_block_set_type(block, type);
	mem_block_set_free(block, MEM_BLOCK_HEADER_SIZE);
	mem_block_set_start(block, MEM_BLOCK_HEADER_SIZE);

	if (UNIV_UNLIKELY(heap == NULL)) {
		/* This is the first block of the heap. The field
		total_size should be initialized here */
		block->total_size = len;
	} else {
		/* Not the first allocation for the heap. This block's
		total_length field should be set to undefined. */
		ut_d(block->total_size = ULINT_UNDEFINED);
		UNIV_MEM_INVALID(&block->total_size,
				 sizeof block->total_size);

		heap->total_size += len;
	}

	ut_ad((ulint)MEM_BLOCK_HEADER_SIZE < len);

	return(block);
}

/***************************************************************//**
Adds a new block to a memory heap.
@return created block, NULL if did not succeed (only possible for
MEM_HEAP_BTR_SEARCH type heaps) */
mem_block_t*
mem_heap_add_block(
/*===============*/
	mem_heap_t*	heap,	/*!< in: memory heap */
	ulint		n)	/*!< in: number of bytes user needs */
{
	mem_block_t*	block;
	mem_block_t*	new_block;
	ulint		new_size;

	ut_d(mem_block_validate(heap));

	block = UT_LIST_GET_LAST(heap->base);

	/* We have to allocate a new block. The size is always at least
	doubled until the standard size is reached. After that the size
	stays the same, except in cases where the caller needs more space. */

	new_size = 2 * mem_block_get_len(block);

	if (heap->type != MEM_HEAP_DYNAMIC) {
		/* From the buffer pool we allocate buffer frames */
		ut_a(n <= MEM_MAX_ALLOC_IN_BUF);

		if (new_size > MEM_MAX_ALLOC_IN_BUF) {
			new_size = MEM_MAX_ALLOC_IN_BUF;
		}
	} else if (new_size > MEM_BLOCK_STANDARD_SIZE) {

		new_size = MEM_BLOCK_STANDARD_SIZE;
	}

	if (new_size < n) {
		new_size = n;
	}

	new_block = mem_heap_create_block(heap, new_size, heap->type,
					  heap->file_name, heap->line);
	if (new_block == NULL) {

		return(NULL);
	}

	/* Add the new block as the last block */

	UT_LIST_INSERT_AFTER(heap->base, block, new_block);

	return(new_block);
}

/******************************************************************//**
Frees a block from a memory heap. */
void
mem_heap_block_free(
/*================*/
	mem_heap_t*	heap,	/*!< in: heap */
	mem_block_t*	block)	/*!< in: block to free */
{
	ulint		type;
	ulint		len;
	buf_block_t*	buf_block;

	buf_block = static_cast<buf_block_t*>(block->buf_block);

	mem_block_validate(block);

	UT_LIST_REMOVE(heap->base, block);

	ut_ad(heap->total_size >= block->len);
	heap->total_size -= block->len;

	type = heap->type;
	len = block->len;
	block->magic_n = MEM_FREED_BLOCK_MAGIC_N;

	UNIV_MEM_ASSERT_W(block, len);

	if (type == MEM_HEAP_DYNAMIC || len < UNIV_PAGE_SIZE / 2) {

		ut_ad(!buf_block);
		ut_free(block);
	} else {
		ut_ad(type & MEM_HEAP_BUFFER);

		buf_block_free(buf_block);
	}
}

/******************************************************************//**
Frees the free_block field from a memory heap. */
void
mem_heap_free_block_free(
/*=====================*/
	mem_heap_t*	heap)	/*!< in: heap */
{
	if (UNIV_LIKELY_NULL(heap->free_block)) {

		buf_block_free(static_cast<buf_block_t*>(heap->free_block));

		heap->free_block = NULL;
	}
}