MMHeap.cpp@ 26491

Last change on this file since 26491 was 26491, checked in by vboxsync, 15 years ago
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1	/* $Id: MMHeap.cpp 26491 2010-02-14 07:47:12Z vboxsync $ */
2	/** @file
3	* MM - Memory Manager - Heap.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_MM_HEAP
27	#include <VBox/mm.h>
28	#include <VBox/stam.h>
29	#include <VBox/pgm.h>
30	#include "MMInternal.h"
31	#include <VBox/vm.h>
32	#include <VBox/uvm.h>
33	#include <VBox/err.h>
34	#include <VBox/param.h>
35	#include <VBox/log.h>
36
37	#include <iprt/alloc.h>
38	#include <iprt/assert.h>
39	#include <iprt/string.h>
40
41
42	/*******************************************************************************
43	* Internal Functions *
44	*******************************************************************************/
45	static void *mmR3HeapAlloc(PMMHEAP pHeap, MMTAG enmTag, size_t cbSize, bool fZero);
46
47
48
49	/**
50	* Allocate and initialize a heap structure and it's associated substructures.
51	*
52	* @returns VBox status.
53	* @param pVM The handle to the VM the heap should be associated with.
54	* @param ppHeap Where to store the heap pointer.
55	*/
56	int mmR3HeapCreateU(PUVM pUVM, PMMHEAP *ppHeap)
57	{
58	PMMHEAP pHeap = (PMMHEAP)RTMemAllocZ(sizeof(MMHEAP) + sizeof(MMHEAPSTAT));
59	if (pHeap)
60	{
61	int rc = RTCritSectInit(&pHeap->Lock);
62	if (RT_SUCCESS(rc))
63	{
64	/*
65	* Initialize the global stat record.
66	*/
67	pHeap->pUVM = pUVM;
68	pHeap->Stat.pHeap = pHeap;
69	#ifdef MMR3HEAP_WITH_STATISTICS
70	PMMHEAPSTAT pStat = &pHeap->Stat;
71	STAMR3RegisterU(pUVM, &pStat->cAllocations, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, "/MM/R3Heap/cAllocations", STAMUNIT_CALLS, "Number or MMR3HeapAlloc() calls.");
72	STAMR3RegisterU(pUVM, &pStat->cReallocations, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, "/MM/R3Heap/cReallocations", STAMUNIT_CALLS, "Number of MMR3HeapRealloc() calls.");
73	STAMR3RegisterU(pUVM, &pStat->cFrees, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, "/MM/R3Heap/cFrees", STAMUNIT_CALLS, "Number of MMR3HeapFree() calls.");
74	STAMR3RegisterU(pUVM, &pStat->cFailures, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, "/MM/R3Heap/cFailures", STAMUNIT_COUNT, "Number of failures.");
75	STAMR3RegisterU(pUVM, &pStat->cbCurAllocated, sizeof(pStat->cbCurAllocated) == sizeof(uint32_t) ? STAMTYPE_U32 : STAMTYPE_U64,
76	STAMVISIBILITY_ALWAYS, "/MM/R3Heap/cbCurAllocated", STAMUNIT_BYTES, "Number of bytes currently allocated.");
77	STAMR3RegisterU(pUVM, &pStat->cbAllocated, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, "/MM/R3Heap/cbAllocated", STAMUNIT_BYTES, "Total number of bytes allocated.");
78	STAMR3RegisterU(pUVM, &pStat->cbFreed, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, "/MM/R3Heap/cbFreed", STAMUNIT_BYTES, "Total number of bytes freed.");
79	#endif
80	*ppHeap = pHeap;
81	return VINF_SUCCESS;
82	}
83	AssertRC(rc);
84	RTMemFree(pHeap);
85	}
86	AssertMsgFailed(("failed to allocate heap structure\n"));
87	return VERR_NO_MEMORY;
88	}
89
90
91	/**
92	* Destroy a heap.
93	*
94	* @param pHeap Heap handle.
95	*/
96	void mmR3HeapDestroy(PMMHEAP pHeap)
97	{
98	/*
99	* Start by deleting the lock, that'll trap anyone
100	* attempting to use the heap.
101	*/
102	RTCritSectDelete(&pHeap->Lock);
103
104	/*
105	* Walk the node list and free all the memory.
106	*/
107	PMMHEAPHDR pHdr = pHeap->pHead;
108	while (pHdr)
109	{
110	void *pv = pHdr;
111	pHdr = pHdr->pNext;
112	RTMemFree(pv);
113	}
114
115	/*
116	* Free the stat nodes.
117	*/
118	/** @todo free all nodes in a AVL tree. */
119	RTMemFree(pHeap);
120	}
121
122
123	/**
124	* Allocate memory associating it with the VM for collective cleanup.
125	*
126	* The memory will be allocated from the default heap but a header
127	* is added in which we keep track of which VM it belongs to and chain
128	* all the allocations together so they can be freed in one go.
129	*
130	* This interface is typically used for memory block which will not be
131	* freed during the life of the VM.
132	*
133	* @returns Pointer to allocated memory.
134	* @param pUVM Pointer to the user mode VM structure.
135	* @param enmTag Statistics tag. Statistics are collected on a per tag
136	* basis in addition to a global one. Thus we can easily
137	* identify how memory is used by the VM.
138	* @param cbSize Size of the block.
139	*/
140	VMMR3DECL(void *) MMR3HeapAllocU(PUVM pUVM, MMTAG enmTag, size_t cbSize)
141	{
142	Assert(pUVM->mm.s.pHeap);
143	return mmR3HeapAlloc(pUVM->mm.s.pHeap, enmTag, cbSize, false);
144	}
145
146
147	/**
148	* Allocate memory associating it with the VM for collective cleanup.
149	*
150	* The memory will be allocated from the default heap but a header
151	* is added in which we keep track of which VM it belongs to and chain
152	* all the allocations together so they can be freed in one go.
153	*
154	* This interface is typically used for memory block which will not be
155	* freed during the life of the VM.
156	*
157	* @returns Pointer to allocated memory.
158	* @param pVM VM handle.
159	* @param enmTag Statistics tag. Statistics are collected on a per tag
160	* basis in addition to a global one. Thus we can easily
161	* identify how memory is used by the VM.
162	* @param cbSize Size of the block.
163	*/
164	VMMR3DECL(void *) MMR3HeapAlloc(PVM pVM, MMTAG enmTag, size_t cbSize)
165	{
166	return mmR3HeapAlloc(pVM->pUVM->mm.s.pHeap, enmTag, cbSize, false);
167	}
168
169
170	/**
171	* Same as MMR3HeapAllocU().
172	*
173	* @returns Pointer to allocated memory.
174	* @param pUVM Pointer to the user mode VM structure.
175	* @param enmTag Statistics tag. Statistics are collected on a per tag
176	* basis in addition to a global one. Thus we can easily
177	* identify how memory is used by the VM.
178	* @param cbSize Size of the block.
179	* @param ppv Where to store the pointer to the allocated memory on success.
180	*/
181	VMMR3DECL(int) MMR3HeapAllocExU(PUVM pUVM, MMTAG enmTag, size_t cbSize, void **ppv)
182	{
183	Assert(pUVM->mm.s.pHeap);
184	void *pv = mmR3HeapAlloc(pUVM->mm.s.pHeap, enmTag, cbSize, false);
185	if (pv)
186	{
187	*ppv = pv;
188	return VINF_SUCCESS;
189	}
190	return VERR_NO_MEMORY;
191	}
192
193
194	/**
195	* Same as MMR3HeapAlloc().
196	*
197	* @returns Pointer to allocated memory.
198	* @param pVM VM handle.
199	* @param enmTag Statistics tag. Statistics are collected on a per tag
200	* basis in addition to a global one. Thus we can easily
201	* identify how memory is used by the VM.
202	* @param cbSize Size of the block.
203	* @param ppv Where to store the pointer to the allocated memory on success.
204	*/
205	VMMR3DECL(int) MMR3HeapAllocEx(PVM pVM, MMTAG enmTag, size_t cbSize, void **ppv)
206	{
207	void *pv = mmR3HeapAlloc(pVM->pUVM->mm.s.pHeap, enmTag, cbSize, false);
208	if (pv)
209	{
210	*ppv = pv;
211	return VINF_SUCCESS;
212	}
213	return VERR_NO_MEMORY;
214	}
215
216
217	/**
218	* Same as MMR3HeapAlloc() only the memory is zeroed.
219	*
220	* @returns Pointer to allocated memory.
221	* @param pUVM Pointer to the user mode VM structure.
222	* @param enmTag Statistics tag. Statistics are collected on a per tag
223	* basis in addition to a global one. Thus we can easily
224	* identify how memory is used by the VM.
225	* @param cbSize Size of the block.
226	*/
227	VMMR3DECL(void *) MMR3HeapAllocZU(PUVM pUVM, MMTAG enmTag, size_t cbSize)
228	{
229	return mmR3HeapAlloc(pUVM->mm.s.pHeap, enmTag, cbSize, true);
230	}
231
232
233	/**
234	* Same as MMR3HeapAlloc() only the memory is zeroed.
235	*
236	* @returns Pointer to allocated memory.
237	* @param pVM VM handle.
238	* @param enmTag Statistics tag. Statistics are collected on a per tag
239	* basis in addition to a global one. Thus we can easily
240	* identify how memory is used by the VM.
241	* @param cbSize Size of the block.
242	*/
243	VMMR3DECL(void *) MMR3HeapAllocZ(PVM pVM, MMTAG enmTag, size_t cbSize)
244	{
245	return mmR3HeapAlloc(pVM->pUVM->mm.s.pHeap, enmTag, cbSize, true);
246	}
247
248
249	/**
250	* Same as MMR3HeapAllocZ().
251	*
252	* @returns Pointer to allocated memory.
253	* @param pUVM Pointer to the user mode VM structure.
254	* @param enmTag Statistics tag. Statistics are collected on a per tag
255	* basis in addition to a global one. Thus we can easily
256	* identify how memory is used by the VM.
257	* @param cbSize Size of the block.
258	* @param ppv Where to store the pointer to the allocated memory on success.
259	*/
260	VMMR3DECL(int) MMR3HeapAllocZExU(PUVM pUVM, MMTAG enmTag, size_t cbSize, void **ppv)
261	{
262	Assert(pUVM->mm.s.pHeap);
263	void *pv = mmR3HeapAlloc(pUVM->mm.s.pHeap, enmTag, cbSize, true);
264	if (pv)
265	{
266	*ppv = pv;
267	return VINF_SUCCESS;
268	}
269	return VERR_NO_MEMORY;
270	}
271
272
273	/**
274	* Same as MMR3HeapAllocZ().
275	*
276	* @returns Pointer to allocated memory.
277	* @param pVM VM handle.
278	* @param enmTag Statistics tag. Statistics are collected on a per tag
279	* basis in addition to a global one. Thus we can easily
280	* identify how memory is used by the VM.
281	* @param cbSize Size of the block.
282	* @param ppv Where to store the pointer to the allocated memory on success.
283	*/
284	VMMR3DECL(int) MMR3HeapAllocZEx(PVM pVM, MMTAG enmTag, size_t cbSize, void **ppv)
285	{
286	void *pv = mmR3HeapAlloc(pVM->pUVM->mm.s.pHeap, enmTag, cbSize, true);
287	if (pv)
288	{
289	*ppv = pv;
290	return VINF_SUCCESS;
291	}
292	return VERR_NO_MEMORY;
293	}
294
295
296	/**
297	* Allocate memory from the heap.
298	*
299	* @returns Pointer to allocated memory.
300	* @param pHeap Heap handle.
301	* @param enmTag Statistics tag. Statistics are collected on a per tag
302	* basis in addition to a global one. Thus we can easily
303	* identify how memory is used by the VM.
304	* @param cbSize Size of the block.
305	* @param fZero Whether or not to zero the memory block.
306	*/
307	void *mmR3HeapAlloc(PMMHEAP pHeap, MMTAG enmTag, size_t cbSize, bool fZero)
308	{
309	#ifdef MMR3HEAP_WITH_STATISTICS
310	RTCritSectEnter(&pHeap->Lock);
311
312	/*
313	* Find/alloc statistics nodes.
314	*/
315	pHeap->Stat.cAllocations++;
316	PMMHEAPSTAT pStat = (PMMHEAPSTAT)RTAvlULGet(&pHeap->pStatTree, (AVLULKEY)enmTag);
317	if (pStat)
318	{
319	pStat->cAllocations++;
320
321	RTCritSectLeave(&pHeap->Lock);
322	}
323	else
324	{
325	pStat = (PMMHEAPSTAT)RTMemAllocZ(sizeof(MMHEAPSTAT));
326	if (!pStat)
327	{
328	pHeap->Stat.cFailures++;
329	AssertMsgFailed(("Failed to allocate heap stat record.\n"));
330	RTCritSectLeave(&pHeap->Lock);
331	return NULL;
332	}
333	pStat->Core.Key = (AVLULKEY)enmTag;
334	pStat->pHeap = pHeap;
335	RTAvlULInsert(&pHeap->pStatTree, &pStat->Core);
336
337	pStat->cAllocations++;
338	RTCritSectLeave(&pHeap->Lock);
339
340	/* register the statistics */
341	PUVM pUVM = pHeap->pUVM;
342	const char *pszTag = mmGetTagName(enmTag);
343	STAMR3RegisterFU(pUVM, &pStat->cbCurAllocated, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, STAMUNIT_BYTES, "Number of bytes currently allocated.", "/MM/R3Heap/%s", pszTag);
344	STAMR3RegisterFU(pUVM, &pStat->cAllocations, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, STAMUNIT_CALLS, "Number or MMR3HeapAlloc() calls.", "/MM/R3Heap/%s/cAllocations", pszTag);
345	STAMR3RegisterFU(pUVM, &pStat->cReallocations, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, STAMUNIT_CALLS, "Number of MMR3HeapRealloc() calls.", "/MM/R3Heap/%s/cReallocations", pszTag);
346	STAMR3RegisterFU(pUVM, &pStat->cFrees, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, STAMUNIT_CALLS, "Number of MMR3HeapFree() calls.", "/MM/R3Heap/%s/cFrees", pszTag);
347	STAMR3RegisterFU(pUVM, &pStat->cFailures, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, STAMUNIT_COUNT, "Number of failures.", "/MM/R3Heap/%s/cFailures", pszTag);
348	STAMR3RegisterFU(pUVM, &pStat->cbAllocated, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, STAMUNIT_BYTES, "Total number of bytes allocated.", "/MM/R3Heap/%s/cbAllocated", pszTag);
349	STAMR3RegisterFU(pUVM, &pStat->cbFreed, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, STAMUNIT_BYTES, "Total number of bytes freed.", "/MM/R3Heap/%s/cbFreed", pszTag);
350	}
351	#endif
352
353	/*
354	* Validate input.
355	*/
356	if (cbSize == 0)
357	{
358	#ifdef MMR3HEAP_WITH_STATISTICS
359	RTCritSectEnter(&pHeap->Lock);
360	pStat->cFailures++;
361	pHeap->Stat.cFailures++;
362	RTCritSectLeave(&pHeap->Lock);
363	#endif
364	return NULL;
365	}
366
367	/*
368	* Allocate heap block.
369	*/
370	cbSize = RT_ALIGN_Z(cbSize, MMR3HEAP_SIZE_ALIGNMENT) + sizeof(MMHEAPHDR);
371	PMMHEAPHDR pHdr = (PMMHEAPHDR)(fZero ? RTMemAllocZ(cbSize) : RTMemAlloc(cbSize));
372	if (!pHdr)
373	{
374	AssertMsgFailed(("Failed to allocate heap block %d, enmTag=%x(%.4s).\n", cbSize, enmTag, &enmTag));
375	#ifdef MMR3HEAP_WITH_STATISTICS
376	RTCritSectEnter(&pHeap->Lock);
377	pStat->cFailures++;
378	pHeap->Stat.cFailures++;
379	RTCritSectLeave(&pHeap->Lock);
380	#endif
381	return NULL;
382	}
383	Assert(!((uintptr_t)pHdr & (RTMEM_ALIGNMENT - 1)));
384
385	RTCritSectEnter(&pHeap->Lock);
386
387	/*
388	* Init and link in the header.
389	*/
390	pHdr->pNext = NULL;
391	pHdr->pPrev = pHeap->pTail;
392	if (pHdr->pPrev)
393	pHdr->pPrev->pNext = pHdr;
394	else
395	pHeap->pHead = pHdr;
396	pHeap->pTail = pHdr;
397	#ifdef MMR3HEAP_WITH_STATISTICS
398	pHdr->pStat = pStat;
399	#else
400	pHdr->pStat = &pHeap->Stat;
401	#endif
402	pHdr->cbSize = cbSize;
403
404	/*
405	* Update statistics
406	*/
407	#ifdef MMR3HEAP_WITH_STATISTICS
408	pStat->cbAllocated += cbSize;
409	pStat->cbCurAllocated += cbSize;
410	pHeap->Stat.cbAllocated += cbSize;
411	pHeap->Stat.cbCurAllocated += cbSize;
412	#endif
413
414	RTCritSectLeave(&pHeap->Lock);
415
416	return pHdr + 1;
417	}
418
419
420	/**
421	* Reallocate memory allocated with MMR3HeapAlloc() or MMR3HeapRealloc().
422	*
423	* @returns Pointer to reallocated memory.
424	* @param pv Pointer to the memory block to reallocate.
425	* Must not be NULL!
426	* @param cbNewSize New block size.
427	*/
428	VMMR3DECL(void ) MMR3HeapRealloc(void pv, size_t cbNewSize)
429	{
430	AssertMsg(pv, ("Invalid pointer pv=%p\n", pv));
431	if (!pv)
432	return NULL;
433
434	/*
435	* If newsize is zero then this is a free.
436	*/
437	if (!cbNewSize)
438	{
439	MMR3HeapFree(pv);
440	return NULL;
441	}
442
443	/*
444	* Validate header.
445	*/
446	PMMHEAPHDR pHdr = (PMMHEAPHDR)pv - 1;
447	if ( pHdr->cbSize & (MMR3HEAP_SIZE_ALIGNMENT - 1)
448	\|\| (uintptr_t)pHdr & (RTMEM_ALIGNMENT - 1))
449	{
450	AssertMsgFailed(("Invalid heap header! pv=%p, size=%#x\n", pv, pHdr->cbSize));
451	return NULL;
452	}
453	Assert(pHdr->pStat != NULL);
454	Assert(!((uintptr_t)pHdr->pNext & (RTMEM_ALIGNMENT - 1)));
455	Assert(!((uintptr_t)pHdr->pPrev & (RTMEM_ALIGNMENT - 1)));
456
457	PMMHEAP pHeap = pHdr->pStat->pHeap;
458
459	#ifdef MMR3HEAP_WITH_STATISTICS
460	RTCritSectEnter(&pHeap->Lock);
461	pHdr->pStat->cReallocations++;
462	pHeap->Stat.cReallocations++;
463	RTCritSectLeave(&pHeap->Lock);
464	#endif
465
466	/*
467	* Rellocate the block.
468	*/
469	cbNewSize = RT_ALIGN_Z(cbNewSize, MMR3HEAP_SIZE_ALIGNMENT) + sizeof(MMHEAPHDR);
470	PMMHEAPHDR pHdrNew = (PMMHEAPHDR)RTMemRealloc(pHdr, cbNewSize);
471	if (!pHdrNew)
472	{
473	#ifdef MMR3HEAP_WITH_STATISTICS
474	RTCritSectEnter(&pHeap->Lock);
475	pHdr->pStat->cFailures++;
476	pHeap->Stat.cFailures++;
477	RTCritSectLeave(&pHeap->Lock);
478	#endif
479	return NULL;
480	}
481
482	/*
483	* Update pointers.
484	*/
485	if (pHdrNew != pHdr)
486	{
487	RTCritSectEnter(&pHeap->Lock);
488	if (pHdrNew->pPrev)
489	pHdrNew->pPrev->pNext = pHdrNew;
490	else
491	pHeap->pHead = pHdrNew;
492
493	if (pHdrNew->pNext)
494	pHdrNew->pNext->pPrev = pHdrNew;
495	else
496	pHeap->pTail = pHdrNew;
497	RTCritSectLeave(&pHeap->Lock);
498	}
499
500	/*
501	* Update statistics.
502	*/
503	#ifdef MMR3HEAP_WITH_STATISTICS
504	RTCritSectEnter(&pHeap->Lock);
505	pHdrNew->pStat->cbAllocated += cbNewSize - pHdrNew->cbSize;
506	pHeap->Stat.cbAllocated += cbNewSize - pHdrNew->cbSize;
507	RTCritSectLeave(&pHeap->Lock);
508	#endif
509
510	pHdrNew->cbSize = cbNewSize;
511
512	return pHdrNew + 1;
513	}
514
515
516	/**
517	* Duplicates the specified string.
518	*
519	* @returns Pointer to the duplicate.
520	* @returns NULL on failure or when input NULL.
521	* @param pUVM Pointer to the user mode VM structure.
522	* @param enmTag Statistics tag. Statistics are collected on a per tag
523	* basis in addition to a global one. Thus we can easily
524	* identify how memory is used by the VM.
525	* @param psz The string to duplicate. NULL is allowed.
526	*/
527	VMMR3DECL(char ) MMR3HeapStrDupU(PUVM pUVM, MMTAG enmTag, const char psz)
528	{
529	if (!psz)
530	return NULL;
531	AssertPtr(psz);
532
533	size_t cch = strlen(psz) + 1;
534	char pszDup = (char )MMR3HeapAllocU(pUVM, enmTag, cch);
535	if (pszDup)
536	memcpy(pszDup, psz, cch);
537	return pszDup;
538	}
539
540
541	/**
542	* Duplicates the specified string.
543	*
544	* @returns Pointer to the duplicate.
545	* @returns NULL on failure or when input NULL.
546	* @param pVM The VM handle.
547	* @param enmTag Statistics tag. Statistics are collected on a per tag
548	* basis in addition to a global one. Thus we can easily
549	* identify how memory is used by the VM.
550	* @param psz The string to duplicate. NULL is allowed.
551	*/
552	VMMR3DECL(char ) MMR3HeapStrDup(PVM pVM, MMTAG enmTag, const char psz)
553	{
554	return MMR3HeapStrDupU(pVM->pUVM, enmTag, psz);
555	}
556
557
558	/**
559	* Allocating string printf.
560	*
561	* @returns Pointer to the string.
562	* @param pVM The VM
563	* @param enmTag The statistics tag.
564	* @param pszFormat The format string.
565	* @param ... Format arguments.
566	*/
567	VMMR3DECL(char ) MMR3HeapAPrintf(PVM pVM, MMTAG enmTag, const char pszFormat, ...)
568	{
569	va_list va;
570	va_start(va, pszFormat);
571	char *psz = MMR3HeapAPrintfVU(pVM->pUVM, enmTag, pszFormat, va);
572	va_end(va);
573	return psz;
574	}
575
576
577	/**
578	* Allocating string printf.
579	*
580	* @returns Pointer to the string.
581	* @param pUVM Pointer to the user mode VM structure.
582	* @param enmTag The statistics tag.
583	* @param pszFormat The format string.
584	* @param ... Format arguments.
585	*/
586	VMMR3DECL(char ) MMR3HeapAPrintfU(PUVM pUVM, MMTAG enmTag, const char pszFormat, ...)
587	{
588	va_list va;
589	va_start(va, pszFormat);
590	char *psz = MMR3HeapAPrintfVU(pUVM, enmTag, pszFormat, va);
591	va_end(va);
592	return psz;
593	}
594
595
596	/**
597	* Allocating string printf.
598	*
599	* @returns Pointer to the string.
600	* @param pVM The VM
601	* @param enmTag The statistics tag.
602	* @param pszFormat The format string.
603	* @param va Format arguments.
604	*/
605	VMMR3DECL(char ) MMR3HeapAPrintfV(PVM pVM, MMTAG enmTag, const char pszFormat, va_list va)
606	{
607	return MMR3HeapAPrintfVU(pVM->pUVM, enmTag, pszFormat, va);
608	}
609
610
611	/**
612	* Allocating string printf.
613	*
614	* @returns Pointer to the string.
615	* @param pUVM Pointer to the user mode VM structure.
616	* @param enmTag The statistics tag.
617	* @param pszFormat The format string.
618	* @param va Format arguments.
619	*/
620	VMMR3DECL(char ) MMR3HeapAPrintfVU(PUVM pUVM, MMTAG enmTag, const char pszFormat, va_list va)
621	{
622	/*
623	* The lazy bird way.
624	*/
625	char *psz;
626	int cch = RTStrAPrintfV(&psz, pszFormat, va);
627	if (cch < 0)
628	return NULL;
629	Assert(psz[cch] == '\0');
630	char pszRet = (char )MMR3HeapAllocU(pUVM, enmTag, cch + 1);
631	if (pszRet)
632	memcpy(pszRet, psz, cch + 1);
633	RTStrFree(psz);
634	return pszRet;
635	}
636
637
638	/**
639	* Releases memory allocated with MMR3HeapAlloc() or MMR3HeapRealloc().
640	*
641	* @param pv Pointer to the memory block to free.
642	*/
643	VMMR3DECL(void) MMR3HeapFree(void *pv)
644	{
645	/* Ignore NULL pointers. */
646	if (!pv)
647	return;
648
649	/*
650	* Validate header.
651	*/
652	PMMHEAPHDR pHdr = (PMMHEAPHDR)pv - 1;
653	if ( pHdr->cbSize & (MMR3HEAP_SIZE_ALIGNMENT - 1)
654	\|\| (uintptr_t)pHdr & (RTMEM_ALIGNMENT - 1))
655	{
656	AssertMsgFailed(("Invalid heap header! pv=%p, size=%#x\n", pv, pHdr->cbSize));
657	return;
658	}
659	Assert(pHdr->pStat != NULL);
660	Assert(!((uintptr_t)pHdr->pNext & (RTMEM_ALIGNMENT - 1)));
661	Assert(!((uintptr_t)pHdr->pPrev & (RTMEM_ALIGNMENT - 1)));
662
663	/*
664	* Update statistics
665	*/
666	PMMHEAP pHeap = pHdr->pStat->pHeap;
667	RTCritSectEnter(&pHeap->Lock);
668
669	#ifdef MMR3HEAP_WITH_STATISTICS
670	pHdr->pStat->cFrees++;
671	pHeap->Stat.cFrees++;
672	pHdr->pStat->cbFreed += pHdr->cbSize;
673	pHeap->Stat.cbFreed += pHdr->cbSize;
674	pHdr->pStat->cbCurAllocated -= pHdr->cbSize;
675	pHeap->Stat.cbCurAllocated -= pHdr->cbSize;
676	#endif
677
678	/*
679	* Unlink it.
680	*/
681	if (pHdr->pPrev)
682	pHdr->pPrev->pNext = pHdr->pNext;
683	else
684	pHeap->pHead = pHdr->pNext;
685
686	if (pHdr->pNext)
687	pHdr->pNext->pPrev = pHdr->pPrev;
688	else
689	pHeap->pTail = pHdr->pPrev;
690
691	RTCritSectLeave(&pHeap->Lock);
692
693	/*
694	* Free the memory.
695	*/
696	RTMemFree(pHdr);
697	}
698

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source: vbox/trunk/src/VBox/VMM/MMHeap.cpp@ 26491

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