DBGFR3Flow.cpp@ 95843

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1	/* $Id: DBGFR3Flow.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility, Control Flow Graph Interface (CFG).
4	*/
5
6	/*
7	* Copyright (C) 2016-2022 Oracle Corporation
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
18
19	/** @page pg_dbgf_cfg DBGFR3Flow - Control Flow Graph Interface
20	*
21	* The control flow graph interface provides an API to disassemble
22	* guest code providing the result in a control flow graph.
23	*/
24
25
26	/*********************************************************************************************************************************
27	* Header Files *
28	*********************************************************************************************************************************/
29	#define LOG_GROUP LOG_GROUP_DBGF
30	#include <VBox/vmm/dbgf.h>
31	#include "DBGFInternal.h"
32	#include <VBox/vmm/mm.h>
33	#include <VBox/vmm/uvm.h>
34	#include <VBox/vmm/vm.h>
35	#include <VBox/err.h>
36	#include <VBox/log.h>
37
38	#include <iprt/assert.h>
39	#include <iprt/thread.h>
40	#include <iprt/param.h>
41	#include <iprt/list.h>
42	#include <iprt/mem.h>
43	#include <iprt/sort.h>
44	#include <iprt/strcache.h>
45
46
47	/*********************************************************************************************************************************
48	* Structures and Typedefs *
49	*********************************************************************************************************************************/
50
51	/**
52	* Internal control flow graph state.
53	*/
54	typedef struct DBGFFLOWINT
55	{
56	/** Reference counter. */
57	uint32_t volatile cRefs;
58	/** Internal reference counter for basic blocks. */
59	uint32_t volatile cRefsBb;
60	/** Flags during creation. */
61	uint32_t fFlags;
62	/** List of all basic blocks. */
63	RTLISTANCHOR LstFlowBb;
64	/** List of identified branch tables. */
65	RTLISTANCHOR LstBranchTbl;
66	/** Number of basic blocks in this control flow graph. */
67	uint32_t cBbs;
68	/** Number of branch tables in this control flow graph. */
69	uint32_t cBranchTbls;
70	/** Number of call instructions in this control flow graph. */
71	uint32_t cCallInsns;
72	/** The lowest addres of a basic block. */
73	DBGFADDRESS AddrLowest;
74	/** The highest address of a basic block. */
75	DBGFADDRESS AddrHighest;
76	/** String cache for disassembled instructions. */
77	RTSTRCACHE hStrCacheInstr;
78	} DBGFFLOWINT;
79	/** Pointer to an internal control flow graph state. */
80	typedef DBGFFLOWINT *PDBGFFLOWINT;
81
82	/**
83	* Instruction record
84	*/
85	typedef struct DBGFFLOWBBINSTR
86	{
87	/** Instruction address. */
88	DBGFADDRESS AddrInstr;
89	/** Size of instruction. */
90	uint32_t cbInstr;
91	/** Disassembled instruction string. */
92	const char *pszInstr;
93	} DBGFFLOWBBINSTR;
94	/** Pointer to an instruction record. */
95	typedef DBGFFLOWBBINSTR *PDBGFFLOWBBINSTR;
96
97
98	/**
99	* A branch table identified by the graph processor.
100	*/
101	typedef struct DBGFFLOWBRANCHTBLINT
102	{
103	/** Node for the list of branch tables. */
104	RTLISTNODE NdBranchTbl;
105	/** The owning control flow graph. */
106	PDBGFFLOWINT pFlow;
107	/** Reference counter. */
108	uint32_t volatile cRefs;
109	/** The general register index holding the bracnh table base. */
110	uint8_t idxGenRegBase;
111	/** Start address of the branch table. */
112	DBGFADDRESS AddrStart;
113	/** Number of valid entries in the branch table. */
114	uint32_t cSlots;
115	/** The addresses contained in the branch table - variable in size. */
116	DBGFADDRESS aAddresses[1];
117	} DBGFFLOWBRANCHTBLINT;
118	/** Pointer to a branch table structure. */
119	typedef DBGFFLOWBRANCHTBLINT *PDBGFFLOWBRANCHTBLINT;
120
121
122	/**
123	* Internal control flow graph basic block state.
124	*/
125	typedef struct DBGFFLOWBBINT
126	{
127	/** Node for the list of all basic blocks. */
128	RTLISTNODE NdFlowBb;
129	/** The control flow graph the basic block belongs to. */
130	PDBGFFLOWINT pFlow;
131	/** Reference counter. */
132	uint32_t volatile cRefs;
133	/** Basic block end type. */
134	DBGFFLOWBBENDTYPE enmEndType;
135	/** Start address of this basic block. */
136	DBGFADDRESS AddrStart;
137	/** End address of this basic block. */
138	DBGFADDRESS AddrEnd;
139	/** Address of the block succeeding.
140	* This is valid for conditional jumps
141	* (the other target is referenced by AddrEnd+1) and
142	* unconditional jumps (not ret, iret, etc.) except
143	* if we can't infer the jump target (jmp eax for example). /
144	DBGFADDRESS AddrTarget;
145	/** The indirect branch table identified for indirect branches. */
146	PDBGFFLOWBRANCHTBLINT pFlowBranchTbl;
147	/** Last status error code if DBGF_FLOW_BB_F_INCOMPLETE_ERR is set. */
148	int rcError;
149	/** Error message if DBGF_FLOW_BB_F_INCOMPLETE_ERR is set. */
150	char *pszErr;
151	/** Flags for this basic block. */
152	uint32_t fFlags;
153	/** Number of instructions in this basic block. */
154	uint32_t cInstr;
155	/** Maximum number of instruction records for this basic block. */
156	uint32_t cInstrMax;
157	/** Instruction records, variable in size. */
158	DBGFFLOWBBINSTR aInstr[1];
159	} DBGFFLOWBBINT;
160	/** Pointer to an internal control flow graph basic block state. */
161	typedef DBGFFLOWBBINT *PDBGFFLOWBBINT;
162
163
164	/**
165	* Control flow graph iterator state.
166	*/
167	typedef struct DBGFFLOWITINT
168	{
169	/** Pointer to the control flow graph (holding a reference). */
170	PDBGFFLOWINT pFlow;
171	/** Next basic block to return. */
172	uint32_t idxBbNext;
173	/** Array of basic blocks sorted by the specified order - variable in size. */
174	PDBGFFLOWBBINT apBb[1];
175	} DBGFFLOWITINT;
176	/** Pointer to the internal control flow graph iterator state. */
177	typedef DBGFFLOWITINT *PDBGFFLOWITINT;
178
179
180	/**
181	* Control flow graph branch table iterator state.
182	*/
183	typedef struct DBGFFLOWBRANCHTBLITINT
184	{
185	/** Pointer to the control flow graph (holding a reference). */
186	PDBGFFLOWINT pFlow;
187	/** Next branch table to return. */
188	uint32_t idxTblNext;
189	/** Array of branch table pointers sorted by the specified order - variable in size. */
190	PDBGFFLOWBRANCHTBLINT apBranchTbl[1];
191	} DBGFFLOWBRANCHTBLITINT;
192	/** Pointer to the internal control flow graph branch table iterator state. */
193	typedef DBGFFLOWBRANCHTBLITINT *PDBGFFLOWBRANCHTBLITINT;
194
195
196	/*********************************************************************************************************************************
197	* Internal Functions *
198	*********************************************************************************************************************************/
199
200	static uint32_t dbgfR3FlowBbReleaseInt(PDBGFFLOWBBINT pFlowBb, bool fMayDestroyFlow);
201	static void dbgfR3FlowBranchTblDestroy(PDBGFFLOWBRANCHTBLINT pFlowBranchTbl);
202
203
204	/**
205	* Checks whether both addresses are equal.
206	*
207	* @returns true if both addresses point to the same location, false otherwise.
208	* @param pAddr1 First address.
209	* @param pAddr2 Second address.
210	*/
211	static bool dbgfR3FlowAddrEqual(PDBGFADDRESS pAddr1, PDBGFADDRESS pAddr2)
212	{
213	return pAddr1->Sel == pAddr2->Sel
214	&& pAddr1->off == pAddr2->off;
215	}
216
217
218	/**
219	* Checks whether the first given address is lower than the second one.
220	*
221	* @returns true if both addresses point to the same location, false otherwise.
222	* @param pAddr1 First address.
223	* @param pAddr2 Second address.
224	*/
225	static bool dbgfR3FlowAddrLower(PDBGFADDRESS pAddr1, PDBGFADDRESS pAddr2)
226	{
227	return pAddr1->Sel == pAddr2->Sel
228	&& pAddr1->off < pAddr2->off;
229	}
230
231
232	/**
233	* Checks whether the given basic block and address intersect.
234	*
235	* @returns true if they intersect, false otherwise.
236	* @param pFlowBb The basic block to check.
237	* @param pAddr The address to check for.
238	*/
239	static bool dbgfR3FlowAddrIntersect(PDBGFFLOWBBINT pFlowBb, PDBGFADDRESS pAddr)
240	{
241	return (pFlowBb->AddrStart.Sel == pAddr->Sel)
242	&& (pFlowBb->AddrStart.off <= pAddr->off)
243	&& (pFlowBb->AddrEnd.off >= pAddr->off);
244	}
245
246
247	/**
248	* Returns the distance of the two given addresses.
249	*
250	* @returns Distance of the addresses.
251	* @param pAddr1 The first address.
252	* @param pAddr2 The second address.
253	*/
254	static RTGCUINTPTR dbgfR3FlowAddrGetDistance(PDBGFADDRESS pAddr1, PDBGFADDRESS pAddr2)
255	{
256	if (pAddr1->Sel == pAddr2->Sel)
257	{
258	if (pAddr1->off >= pAddr2->off)
259	return pAddr1->off - pAddr2->off;
260	else
261	return pAddr2->off - pAddr1->off;
262	}
263	else
264	AssertFailed();
265
266	return 0;
267	}
268
269
270	/**
271	* Creates a new basic block.
272	*
273	* @returns Pointer to the basic block on success or NULL if out of memory.
274	* @param pThis The control flow graph.
275	* @param pAddrStart The start of the basic block.
276	* @param fFlowBbFlags Additional flags for this bascic block.
277	* @param cInstrMax Maximum number of instructions this block can hold initially.
278	*/
279	static PDBGFFLOWBBINT dbgfR3FlowBbCreate(PDBGFFLOWINT pThis, PDBGFADDRESS pAddrStart, uint32_t fFlowBbFlags,
280	uint32_t cInstrMax)
281	{
282	PDBGFFLOWBBINT pFlowBb = (PDBGFFLOWBBINT)RTMemAllocZ(RT_UOFFSETOF_DYN(DBGFFLOWBBINT, aInstr[cInstrMax]));
283	if (RT_LIKELY(pFlowBb))
284	{
285	RTListInit(&pFlowBb->NdFlowBb);
286	pFlowBb->cRefs = 1;
287	pFlowBb->enmEndType = DBGFFLOWBBENDTYPE_INVALID;
288	pFlowBb->pFlow = pThis;
289	pFlowBb->fFlags = DBGF_FLOW_BB_F_EMPTY \| fFlowBbFlags;
290	pFlowBb->AddrStart = *pAddrStart;
291	pFlowBb->AddrEnd = *pAddrStart;
292	pFlowBb->rcError = VINF_SUCCESS;
293	pFlowBb->pszErr = NULL;
294	pFlowBb->cInstr = 0;
295	pFlowBb->cInstrMax = cInstrMax;
296	pFlowBb->pFlowBranchTbl = NULL;
297	ASMAtomicIncU32(&pThis->cRefsBb);
298	}
299
300	return pFlowBb;
301	}
302
303
304	/**
305	* Creates an empty branch table with the given size.
306	*
307	* @returns Pointer to the empty branch table on success or NULL if out of memory.
308	* @param pThis The control flow graph.
309	* @param pAddrStart The start of the branch table.
310	* @param idxGenRegBase The general register index holding the base address.
311	* @param cSlots Number of slots the table has.
312	*/
313	static PDBGFFLOWBRANCHTBLINT
314	dbgfR3FlowBranchTblCreate(PDBGFFLOWINT pThis, PDBGFADDRESS pAddrStart, uint8_t idxGenRegBase, uint32_t cSlots)
315	{
316	PDBGFFLOWBRANCHTBLINT pBranchTbl = (PDBGFFLOWBRANCHTBLINT)RTMemAllocZ(RT_UOFFSETOF_DYN(DBGFFLOWBRANCHTBLINT,
317	aAddresses[cSlots]));
318	if (RT_LIKELY(pBranchTbl))
319	{
320	RTListInit(&pBranchTbl->NdBranchTbl);
321	pBranchTbl->pFlow = pThis;
322	pBranchTbl->idxGenRegBase = idxGenRegBase;
323	pBranchTbl->AddrStart = *pAddrStart;
324	pBranchTbl->cSlots = cSlots;
325	pBranchTbl->cRefs = 1;
326	}
327
328	return pBranchTbl;
329	}
330
331
332	/**
333	* Destroys a control flow graph.
334	*
335	* @returns nothing.
336	* @param pThis The control flow graph to destroy.
337	*/
338	static void dbgfR3FlowDestroy(PDBGFFLOWINT pThis)
339	{
340	/* Defer destruction if there are still basic blocks referencing us. */
341	PDBGFFLOWBBINT pFlowBb;
342	PDBGFFLOWBBINT pFlowBbNext;
343	RTListForEachSafe(&pThis->LstFlowBb, pFlowBb, pFlowBbNext, DBGFFLOWBBINT, NdFlowBb)
344	{
345	dbgfR3FlowBbReleaseInt(pFlowBb, false /fMayDestroyFlow/);
346	}
347
348	Assert(!pThis->cRefs);
349	if (!pThis->cRefsBb)
350	{
351	/* Destroy the branch tables. */
352	PDBGFFLOWBRANCHTBLINT pTbl = NULL;
353	PDBGFFLOWBRANCHTBLINT pTblNext = NULL;
354	RTListForEachSafe(&pThis->LstBranchTbl, pTbl, pTblNext, DBGFFLOWBRANCHTBLINT, NdBranchTbl)
355	{
356	dbgfR3FlowBranchTblDestroy(pTbl);
357	}
358
359	RTStrCacheDestroy(pThis->hStrCacheInstr);
360	RTMemFree(pThis);
361	}
362	}
363
364
365	/**
366	* Destroys a basic block.
367	*
368	* @returns nothing.
369	* @param pFlowBb The basic block to destroy.
370	* @param fMayDestroyFlow Flag whether the control flow graph container
371	* should be destroyed when there is nothing referencing it.
372	*/
373	static void dbgfR3FlowBbDestroy(PDBGFFLOWBBINT pFlowBb, bool fMayDestroyFlow)
374	{
375	PDBGFFLOWINT pThis = pFlowBb->pFlow;
376
377	RTListNodeRemove(&pFlowBb->NdFlowBb);
378	pThis->cBbs--;
379	for (uint32_t idxInstr = 0; idxInstr < pFlowBb->cInstr; idxInstr++)
380	RTStrCacheRelease(pThis->hStrCacheInstr, pFlowBb->aInstr[idxInstr].pszInstr);
381	uint32_t cRefsBb = ASMAtomicDecU32(&pThis->cRefsBb);
382	RTMemFree(pFlowBb);
383
384	if (!cRefsBb && !pThis->cRefs && fMayDestroyFlow)
385	dbgfR3FlowDestroy(pThis);
386	}
387
388
389	/**
390	* Destroys a given branch table.
391	*
392	* @returns nothing.
393	* @param pFlowBranchTbl The flow branch table to destroy.
394	*/
395	static void dbgfR3FlowBranchTblDestroy(PDBGFFLOWBRANCHTBLINT pFlowBranchTbl)
396	{
397	RTListNodeRemove(&pFlowBranchTbl->NdBranchTbl);
398	RTMemFree(pFlowBranchTbl);
399	}
400
401
402	/**
403	* Internal basic block release worker.
404	*
405	* @returns New reference count of the released basic block, on 0
406	* it is destroyed.
407	* @param pFlowBb The basic block to release.
408	* @param fMayDestroyFlow Flag whether the control flow graph container
409	* should be destroyed when there is nothing referencing it.
410	*/
411	static uint32_t dbgfR3FlowBbReleaseInt(PDBGFFLOWBBINT pFlowBb, bool fMayDestroyFlow)
412	{
413	uint32_t cRefs = ASMAtomicDecU32(&pFlowBb->cRefs);
414	AssertMsg(cRefs < _1M, ("%#x %p %d\n", cRefs, pFlowBb, pFlowBb->enmEndType));
415	if (cRefs == 0)
416	dbgfR3FlowBbDestroy(pFlowBb, fMayDestroyFlow);
417	return cRefs;
418	}
419
420
421	/**
422	* Links the given basic block into the control flow graph.
423	*
424	* @returns nothing.
425	* @param pThis The control flow graph to link into.
426	* @param pFlowBb The basic block to link.
427	*/
428	DECLINLINE(void) dbgfR3FlowLink(PDBGFFLOWINT pThis, PDBGFFLOWBBINT pFlowBb)
429	{
430	RTListAppend(&pThis->LstFlowBb, &pFlowBb->NdFlowBb);
431	pThis->cBbs++;
432	}
433
434
435	/**
436	* Links the given branch table into the control flow graph.
437	*
438	* @returns nothing.
439	* @param pThis The control flow graph to link into.
440	* @param pBranchTbl The branch table to link.
441	*/
442	DECLINLINE(void) dbgfR3FlowBranchTblLink(PDBGFFLOWINT pThis, PDBGFFLOWBRANCHTBLINT pBranchTbl)
443	{
444	RTListAppend(&pThis->LstBranchTbl, &pBranchTbl->NdBranchTbl);
445	pThis->cBranchTbls++;
446	}
447
448
449	/**
450	* Returns the first unpopulated basic block of the given control flow graph.
451	*
452	* @returns The first unpopulated control flow graph or NULL if not found.
453	* @param pThis The control flow graph.
454	*/
455	DECLINLINE(PDBGFFLOWBBINT) dbgfR3FlowGetUnpopulatedBb(PDBGFFLOWINT pThis)
456	{
457	PDBGFFLOWBBINT pFlowBb;
458	RTListForEach(&pThis->LstFlowBb, pFlowBb, DBGFFLOWBBINT, NdFlowBb)
459	{
460	if (pFlowBb->fFlags & DBGF_FLOW_BB_F_EMPTY)
461	return pFlowBb;
462	}
463
464	return NULL;
465	}
466
467
468	/**
469	* Returns the branch table with the given address if it exists.
470	*
471	* @returns Pointer to the branch table record or NULL if not found.
472	* @param pThis The control flow graph.
473	* @param pAddrTbl The branch table address.
474	*/
475	DECLINLINE(PDBGFFLOWBRANCHTBLINT) dbgfR3FlowBranchTblFindByAddr(PDBGFFLOWINT pThis, PDBGFADDRESS pAddrTbl)
476	{
477	PDBGFFLOWBRANCHTBLINT pTbl;
478	RTListForEach(&pThis->LstBranchTbl, pTbl, DBGFFLOWBRANCHTBLINT, NdBranchTbl)
479	{
480	if (dbgfR3FlowAddrEqual(&pTbl->AddrStart, pAddrTbl))
481	return pTbl;
482	}
483
484	return NULL;
485	}
486
487
488	/**
489	* Sets the given error status for the basic block.
490	*
491	* @returns nothing.
492	* @param pFlowBb The basic block causing the error.
493	* @param rcError The error to set.
494	* @param pszFmt Format string of the error description.
495	* @param ... Arguments for the format string.
496	*/
497	static void dbgfR3FlowBbSetError(PDBGFFLOWBBINT pFlowBb, int rcError, const char *pszFmt, ...)
498	{
499	va_list va;
500	va_start(va, pszFmt);
501
502	Assert(!(pFlowBb->fFlags & DBGF_FLOW_BB_F_INCOMPLETE_ERR));
503	pFlowBb->fFlags \|= DBGF_FLOW_BB_F_INCOMPLETE_ERR;
504	pFlowBb->fFlags &= ~DBGF_FLOW_BB_F_EMPTY;
505	pFlowBb->rcError = rcError;
506	pFlowBb->pszErr = RTStrAPrintf2V(pszFmt, va);
507	va_end(va);
508	}
509
510
511	/**
512	* Checks whether the given control flow graph contains a basic block
513	* with the given start address.
514	*
515	* @returns true if there is a basic block with the start address, false otherwise.
516	* @param pThis The control flow graph.
517	* @param pAddr The address to check for.
518	*/
519	static bool dbgfR3FlowHasBbWithStartAddr(PDBGFFLOWINT pThis, PDBGFADDRESS pAddr)
520	{
521	PDBGFFLOWBBINT pFlowBb;
522	RTListForEach(&pThis->LstFlowBb, pFlowBb, DBGFFLOWBBINT, NdFlowBb)
523	{
524	if (dbgfR3FlowAddrEqual(&pFlowBb->AddrStart, pAddr))
525	return true;
526	}
527	return false;
528	}
529
530
531	/**
532	* Splits a given basic block into two at the given address.
533	*
534	* @returns VBox status code.
535	* @param pThis The control flow graph.
536	* @param pFlowBb The basic block to split.
537	* @param pAddr The address to split at.
538	*/
539	static int dbgfR3FlowBbSplit(PDBGFFLOWINT pThis, PDBGFFLOWBBINT pFlowBb, PDBGFADDRESS pAddr)
540	{
541	int rc = VINF_SUCCESS;
542	uint32_t idxInstrSplit;
543
544	/* If the block is empty it will get populated later so there is nothing to split,
545	* same if the start address equals. */
546	if ( pFlowBb->fFlags & DBGF_FLOW_BB_F_EMPTY
547	\|\| dbgfR3FlowAddrEqual(&pFlowBb->AddrStart, pAddr))
548	return VINF_SUCCESS;
549
550	/* Find the instruction to split at. */
551	for (idxInstrSplit = 1; idxInstrSplit < pFlowBb->cInstr; idxInstrSplit++)
552	if (dbgfR3FlowAddrEqual(&pFlowBb->aInstr[idxInstrSplit].AddrInstr, pAddr))
553	break;
554
555	Assert(idxInstrSplit > 0);
556
557	/*
558	* Given address might not be on instruction boundary, this is not supported
559	* so far and results in an error.
560	*/
561	if (idxInstrSplit < pFlowBb->cInstr)
562	{
563	/* Create new basic block. */
564	uint32_t cInstrNew = pFlowBb->cInstr - idxInstrSplit;
565	PDBGFFLOWBBINT pFlowBbNew = dbgfR3FlowBbCreate(pThis, &pFlowBb->aInstr[idxInstrSplit].AddrInstr,
566	0 /fFlowBbFlags/, cInstrNew);
567	if (pFlowBbNew)
568	{
569	/* Move instructions over. */
570	pFlowBbNew->cInstr = cInstrNew;
571	pFlowBbNew->AddrEnd = pFlowBb->AddrEnd;
572	pFlowBbNew->enmEndType = pFlowBb->enmEndType;
573	pFlowBbNew->AddrTarget = pFlowBb->AddrTarget;
574	pFlowBbNew->fFlags = pFlowBb->fFlags & ~DBGF_FLOW_BB_F_ENTRY;
575	pFlowBbNew->pFlowBranchTbl = pFlowBb->pFlowBranchTbl;
576	pFlowBb->pFlowBranchTbl = NULL;
577
578	/* Move any error to the new basic block and clear them in the old basic block. */
579	pFlowBbNew->rcError = pFlowBb->rcError;
580	pFlowBbNew->pszErr = pFlowBb->pszErr;
581	pFlowBb->rcError = VINF_SUCCESS;
582	pFlowBb->pszErr = NULL;
583	pFlowBb->fFlags &= ~DBGF_FLOW_BB_F_INCOMPLETE_ERR;
584
585	memcpy(&pFlowBbNew->aInstr[0], &pFlowBb->aInstr[idxInstrSplit], cInstrNew * sizeof(DBGFFLOWBBINSTR));
586	pFlowBb->cInstr = idxInstrSplit;
587	pFlowBb->enmEndType = DBGFFLOWBBENDTYPE_UNCOND;
588	pFlowBb->AddrEnd = pFlowBb->aInstr[idxInstrSplit-1].AddrInstr;
589	pFlowBb->AddrTarget = pFlowBbNew->AddrStart;
590	DBGFR3AddrAdd(&pFlowBb->AddrEnd, pFlowBb->aInstr[idxInstrSplit-1].cbInstr - 1);
591	RT_BZERO(&pFlowBb->aInstr[idxInstrSplit], cInstrNew * sizeof(DBGFFLOWBBINSTR));
592
593	dbgfR3FlowLink(pThis, pFlowBbNew);
594	}
595	else
596	rc = VERR_NO_MEMORY;
597	}
598	else
599	AssertFailedStmt(rc = VERR_INVALID_STATE); /** @todo Proper status code. */
600
601	return rc;
602	}
603
604
605	/**
606	* Makes sure there is an successor at the given address splitting already existing
607	* basic blocks if they intersect.
608	*
609	* @returns VBox status code.
610	* @param pThis The control flow graph.
611	* @param pAddrSucc The guest address the new successor should start at.
612	* @param fNewBbFlags Flags for the new basic block.
613	* @param pBranchTbl Branch table candidate for this basic block.
614	*/
615	static int dbgfR3FlowBbSuccessorAdd(PDBGFFLOWINT pThis, PDBGFADDRESS pAddrSucc,
616	uint32_t fNewBbFlags, PDBGFFLOWBRANCHTBLINT pBranchTbl)
617	{
618	PDBGFFLOWBBINT pFlowBb;
619	RTListForEach(&pThis->LstFlowBb, pFlowBb, DBGFFLOWBBINT, NdFlowBb)
620	{
621	/*
622	* The basic block must be split if it intersects with the given address
623	* and the start address does not equal the given one.
624	*/
625	if (dbgfR3FlowAddrIntersect(pFlowBb, pAddrSucc))
626	return dbgfR3FlowBbSplit(pThis, pFlowBb, pAddrSucc);
627	}
628
629	int rc = VINF_SUCCESS;
630	pFlowBb = dbgfR3FlowBbCreate(pThis, pAddrSucc, fNewBbFlags, 10);
631	if (pFlowBb)
632	{
633	pFlowBb->pFlowBranchTbl = pBranchTbl;
634	dbgfR3FlowLink(pThis, pFlowBb);
635	}
636	else
637	rc = VERR_NO_MEMORY;
638
639	return rc;
640	}
641
642
643	/**
644	* Returns whether the parameter indicates an indirect branch.
645	*
646	* @returns Flag whether this is an indirect branch.
647	* @param pDisParam The parameter from the disassembler.
648	*/
649	DECLINLINE(bool) dbgfR3FlowBranchTargetIsIndirect(PDISOPPARAM pDisParam)
650	{
651	bool fIndirect = true;
652
653	if ( pDisParam->fUse & (DISUSE_IMMEDIATE8 \| DISUSE_IMMEDIATE16 \| DISUSE_IMMEDIATE32 \| DISUSE_IMMEDIATE64)
654	\|\| pDisParam->fUse & (DISUSE_IMMEDIATE8_REL \| DISUSE_IMMEDIATE16_REL \| DISUSE_IMMEDIATE32_REL \| DISUSE_IMMEDIATE64_REL))
655	fIndirect = false;
656
657	return fIndirect;
658	}
659
660
661	/**
662	* Resolves the direct branch target address if possible from the given instruction address
663	* and instruction parameter.
664	*
665	* @returns VBox status code.
666	* @param pUVM The usermode VM handle.
667	* @param idCpu CPU id for resolving the address.
668	* @param pDisParam The parameter from the disassembler.
669	* @param pAddrInstr The instruction address.
670	* @param cbInstr Size of instruction in bytes.
671	* @param fRelJmp Flag whether this is a reltive jump.
672	* @param pAddrJmpTarget Where to store the address to the jump target on success.
673	*/
674	static int dbgfR3FlowQueryDirectBranchTarget(PUVM pUVM, VMCPUID idCpu, PDISOPPARAM pDisParam, PDBGFADDRESS pAddrInstr,
675	uint32_t cbInstr, bool fRelJmp, PDBGFADDRESS pAddrJmpTarget)
676	{
677	int rc = VINF_SUCCESS;
678
679	Assert(!dbgfR3FlowBranchTargetIsIndirect(pDisParam));
680
681	/* Relative jumps are always from the beginning of the next instruction. */
682	pAddrJmpTarget = pAddrInstr;
683	DBGFR3AddrAdd(pAddrJmpTarget, cbInstr);
684
685	if (fRelJmp)
686	{
687	RTGCINTPTR iRel = 0;
688	if (pDisParam->fUse & DISUSE_IMMEDIATE8_REL)
689	iRel = (int8_t)pDisParam->uValue;
690	else if (pDisParam->fUse & DISUSE_IMMEDIATE16_REL)
691	iRel = (int16_t)pDisParam->uValue;
692	else if (pDisParam->fUse & DISUSE_IMMEDIATE32_REL)
693	iRel = (int32_t)pDisParam->uValue;
694	else if (pDisParam->fUse & DISUSE_IMMEDIATE64_REL)
695	iRel = (int64_t)pDisParam->uValue;
696	else
697	AssertFailedStmt(rc = VERR_NOT_SUPPORTED);
698
699	if (iRel < 0)
700	DBGFR3AddrSub(pAddrJmpTarget, -iRel);
701	else
702	DBGFR3AddrAdd(pAddrJmpTarget, iRel);
703	}
704	else
705	{
706	if (pDisParam->fUse & (DISUSE_IMMEDIATE8 \| DISUSE_IMMEDIATE16 \| DISUSE_IMMEDIATE32 \| DISUSE_IMMEDIATE64))
707	{
708	if (DBGFADDRESS_IS_FLAT(pAddrInstr))
709	DBGFR3AddrFromFlat(pUVM, pAddrJmpTarget, pDisParam->uValue);
710	else
711	DBGFR3AddrFromSelOff(pUVM, idCpu, pAddrJmpTarget, pAddrInstr->Sel, pDisParam->uValue);
712	}
713	else
714	AssertFailedStmt(rc = VERR_INVALID_STATE);
715	}
716
717	return rc;
718	}
719
720
721	/**
722	* Returns the CPU mode based on the given assembler flags.
723	*
724	* @returns CPU mode.
725	* @param pUVM The user mode VM handle.
726	* @param idCpu CPU id for disassembling.
727	* @param fFlagsDisasm The flags used for disassembling.
728	*/
729	static CPUMMODE dbgfR3FlowGetDisasCpuMode(PUVM pUVM, VMCPUID idCpu, uint32_t fFlagsDisasm)
730	{
731	CPUMMODE enmMode = CPUMMODE_INVALID;
732	uint32_t fDisasMode = fFlagsDisasm & DBGF_DISAS_FLAGS_MODE_MASK;
733	if (fDisasMode == DBGF_DISAS_FLAGS_DEFAULT_MODE)
734	enmMode = DBGFR3CpuGetMode(pUVM, idCpu);
735	else if ( fDisasMode == DBGF_DISAS_FLAGS_16BIT_MODE
736	\|\| fDisasMode == DBGF_DISAS_FLAGS_16BIT_REAL_MODE)
737	enmMode = CPUMMODE_REAL;
738	else if (fDisasMode == DBGF_DISAS_FLAGS_32BIT_MODE)
739	enmMode = CPUMMODE_PROTECTED;
740	else if (fDisasMode == DBGF_DISAS_FLAGS_64BIT_MODE)
741	enmMode = CPUMMODE_LONG;
742	else
743	AssertFailed();
744
745	return enmMode;
746	}
747
748
749	/**
750	* Searches backwards in the given basic block starting the given instruction index for
751	* a mov instruction with the given register as the target where the constant looks like
752	* a pointer.
753	*
754	* @returns Flag whether a candidate was found.
755	* @param pFlowBb The basic block containing the indirect branch.
756	* @param idxRegTgt The general register the mov targets.
757	* @param cbPtr The pointer size to look for.
758	* @param pUVM The user mode VM handle.
759	* @param idCpu CPU id for disassembling.
760	* @param fFlagsDisasm The flags to use for disassembling.
761	* @param pidxInstrStart The instruction index to start searching for on input,
762	* The last instruction evaluated on output.
763	* @param pAddrDest Where to store the candidate address on success.
764	*/
765	static bool dbgfR3FlowSearchMovWithConstantPtrSizeBackwards(PDBGFFLOWBBINT pFlowBb, uint8_t idxRegTgt, uint32_t cbPtr,
766	PUVM pUVM, VMCPUID idCpu, uint32_t fFlagsDisasm,
767	uint32_t *pidxInstrStart, PDBGFADDRESS pAddrDest)
768	{
769	bool fFound = false;
770	uint32_t idxInstrCur = *pidxInstrStart;
771	uint32_t cInstrCheck = idxInstrCur + 1;
772
773	for (;;)
774	{
775	/** @todo Avoid to disassemble again. */
776	PDBGFFLOWBBINSTR pInstr = &pFlowBb->aInstr[idxInstrCur];
777	DBGFDISSTATE DisState;
778	char szOutput[_4K];
779
780	int rc = dbgfR3DisasInstrStateEx(pUVM, idCpu, &pInstr->AddrInstr, fFlagsDisasm,
781	&szOutput[0], sizeof(szOutput), &DisState);
782	if (RT_SUCCESS(rc))
783	{
784	if ( DisState.pCurInstr->uOpcode == OP_MOV
785	&& (DisState.Param1.fUse & (DISUSE_REG_GEN16 \| DISUSE_REG_GEN32 \| DISUSE_REG_GEN64))
786	&& DisState.Param1.Base.idxGenReg == idxRegTgt
787	/&& DisState.Param1.cb == cbPtr/
788	&& DisState.Param2.cb == cbPtr
789	&& (DisState.Param2.fUse & (DISUSE_IMMEDIATE16 \| DISUSE_IMMEDIATE32 \| DISUSE_IMMEDIATE64)))
790	{
791	/* Found possible candidate. */
792	fFound = true;
793	if (DBGFADDRESS_IS_FLAT(&pInstr->AddrInstr))
794	DBGFR3AddrFromFlat(pUVM, pAddrDest, DisState.Param2.uValue);
795	else
796	DBGFR3AddrFromSelOff(pUVM, idCpu, pAddrDest, pInstr->AddrInstr.Sel, DisState.Param2.uValue);
797	break;
798	}
799	}
800	else
801	break;
802
803	cInstrCheck--;
804	if (!cInstrCheck)
805	break;
806
807	idxInstrCur--;
808	}
809
810	*pidxInstrStart = idxInstrCur;
811	return fFound;
812	}
813
814
815	/**
816	* Verifies the given branch table candidate and adds it to the control flow graph on success.
817	*
818	* @returns VBox status code.
819	* @param pThis The flow control graph.
820	* @param pFlowBb The basic block causing the indirect branch.
821	* @param pAddrBranchTbl Address of the branch table location.
822	* @param idxGenRegBase The general register holding the base address.
823	* @param cbPtr Guest pointer size.
824	* @param pUVM The user mode VM handle.
825	* @param idCpu CPU id for disassembling.
826	*
827	* @todo Handle branch tables greater than 4KB (lazy coder).
828	*/
829	static int dbgfR3FlowBranchTblVerifyAdd(PDBGFFLOWINT pThis, PDBGFFLOWBBINT pFlowBb, PDBGFADDRESS pAddrBranchTbl,
830	uint8_t idxGenRegBase, uint32_t cbPtr, PUVM pUVM, VMCPUID idCpu)
831	{
832	int rc = VINF_SUCCESS;
833	PDBGFFLOWBRANCHTBLINT pBranchTbl = dbgfR3FlowBranchTblFindByAddr(pThis, pAddrBranchTbl);
834
835	if (!pBranchTbl)
836	{
837	uint32_t cSlots = 0;
838	uint8_t abBuf[_4K];
839
840	rc = DBGFR3MemRead(pUVM, idCpu, pAddrBranchTbl, &abBuf[0], sizeof(abBuf));
841	if (RT_SUCCESS(rc))
842	{
843	uint8_t *pbBuf = &abBuf[0];
844	while (pbBuf < &abBuf[0] + sizeof(abBuf))
845	{
846	DBGFADDRESS AddrDest;
847	RTGCUINTPTR GCPtr = cbPtr == sizeof(uint64_t)
848	? (uint64_t )pbBuf
849	: cbPtr == sizeof(uint32_t)
850	? (uint32_t )pbBuf
851	: (uint16_t )pbBuf;
852	pbBuf += cbPtr;
853
854	if (DBGFADDRESS_IS_FLAT(pAddrBranchTbl))
855	DBGFR3AddrFromFlat(pUVM, &AddrDest, GCPtr);
856	else
857	DBGFR3AddrFromSelOff(pUVM, idCpu, &AddrDest, pAddrBranchTbl->Sel, GCPtr);
858
859	if (dbgfR3FlowAddrGetDistance(&AddrDest, &pFlowBb->AddrEnd) > _512K)
860	break;
861
862	cSlots++;
863	}
864
865	/* If there are any slots use it. */
866	if (cSlots)
867	{
868	pBranchTbl = dbgfR3FlowBranchTblCreate(pThis, pAddrBranchTbl, idxGenRegBase, cSlots);
869	if (pBranchTbl)
870	{
871	/* Get the addresses. */
872	for (unsigned i = 0; i < cSlots && RT_SUCCESS(rc); i++)
873	{
874	RTGCUINTPTR GCPtr = cbPtr == sizeof(uint64_t)
875	? (uint64_t )&abBuf[i * cbPtr]
876	: cbPtr == sizeof(uint32_t)
877	? (uint32_t )&abBuf[i * cbPtr]
878	: (uint16_t )&abBuf[i * cbPtr];
879
880	if (DBGFADDRESS_IS_FLAT(pAddrBranchTbl))
881	DBGFR3AddrFromFlat(pUVM, &pBranchTbl->aAddresses[i], GCPtr);
882	else
883	DBGFR3AddrFromSelOff(pUVM, idCpu, &pBranchTbl->aAddresses[i],
884	pAddrBranchTbl->Sel, GCPtr);
885	rc = dbgfR3FlowBbSuccessorAdd(pThis, &pBranchTbl->aAddresses[i], DBGF_FLOW_BB_F_BRANCH_TABLE,
886	pBranchTbl);
887	}
888	dbgfR3FlowBranchTblLink(pThis, pBranchTbl);
889	}
890	else
891	rc = VERR_NO_MEMORY;
892	}
893	}
894	}
895
896	if (pBranchTbl)
897	pFlowBb->pFlowBranchTbl = pBranchTbl;
898
899	return rc;
900	}
901
902
903	/**
904	* Checks whether the location for the branch target candidate contains a valid code address.
905	*
906	* @returns VBox status code.
907	* @param pThis The flow control graph.
908	* @param pFlowBb The basic block causing the indirect branch.
909	* @param pAddrBranchTgt Address of the branch target location.
910	* @param idxGenRegBase The general register holding the address of the location.
911	* @param cbPtr Guest pointer size.
912	* @param pUVM The user mode VM handle.
913	* @param idCpu CPU id for disassembling.
914	* @param fBranchTbl Flag whether this is a possible branch table containing multiple
915	* targets.
916	*/
917	static int dbgfR3FlowCheckBranchTargetLocation(PDBGFFLOWINT pThis, PDBGFFLOWBBINT pFlowBb, PDBGFADDRESS pAddrBranchTgt,
918	uint8_t idxGenRegBase, uint32_t cbPtr, PUVM pUVM, VMCPUID idCpu, bool fBranchTbl)
919	{
920	int rc = VINF_SUCCESS;
921
922	if (!fBranchTbl)
923	{
924	union { uint16_t u16Val; uint32_t u32Val; uint64_t u64Val; } uVal;
925	rc = DBGFR3MemRead(pUVM, idCpu, pAddrBranchTgt, &uVal, cbPtr);
926	if (RT_SUCCESS(rc))
927	{
928	DBGFADDRESS AddrTgt;
929	RTGCUINTPTR GCPtr = cbPtr == sizeof(uint64_t)
930	? uVal.u64Val
931	: cbPtr == sizeof(uint32_t)
932	? uVal.u32Val
933	: uVal.u16Val;
934	if (DBGFADDRESS_IS_FLAT(pAddrBranchTgt))
935	DBGFR3AddrFromFlat(pUVM, &AddrTgt, GCPtr);
936	else
937	DBGFR3AddrFromSelOff(pUVM, idCpu, &AddrTgt, pAddrBranchTgt->Sel, GCPtr);
938
939	if (dbgfR3FlowAddrGetDistance(&AddrTgt, &pFlowBb->AddrEnd) <= _128K)
940	{
941	/* Finish the basic block. */
942	pFlowBb->AddrTarget = AddrTgt;
943	rc = dbgfR3FlowBbSuccessorAdd(pThis, &AddrTgt,
944	(pFlowBb->fFlags & DBGF_FLOW_BB_F_BRANCH_TABLE),
945	pFlowBb->pFlowBranchTbl);
946	}
947	else
948	rc = VERR_NOT_FOUND;
949	}
950	}
951	else
952	rc = dbgfR3FlowBranchTblVerifyAdd(pThis, pFlowBb, pAddrBranchTgt,
953	idxGenRegBase, cbPtr, pUVM, idCpu);
954
955	return rc;
956	}
957
958
959	/**
960	* Tries to resolve the indirect branch.
961	*
962	* @returns VBox status code.
963	* @param pThis The flow control graph.
964	* @param pFlowBb The basic block causing the indirect branch.
965	* @param pUVM The user mode VM handle.
966	* @param idCpu CPU id for disassembling.
967	* @param pDisParam The parameter from the disassembler.
968	* @param fFlagsDisasm Flags for the disassembler.
969	*/
970	static int dbgfR3FlowTryResolveIndirectBranch(PDBGFFLOWINT pThis, PDBGFFLOWBBINT pFlowBb, PUVM pUVM,
971	VMCPUID idCpu, PDISOPPARAM pDisParam, uint32_t fFlagsDisasm)
972	{
973	Assert(dbgfR3FlowBranchTargetIsIndirect(pDisParam));
974
975	uint32_t cbPtr = 0;
976	CPUMMODE enmMode = dbgfR3FlowGetDisasCpuMode(pUVM, idCpu, fFlagsDisasm);
977
978	switch (enmMode)
979	{
980	case CPUMMODE_REAL:
981	cbPtr = sizeof(uint16_t);
982	break;
983	case CPUMMODE_PROTECTED:
984	cbPtr = sizeof(uint32_t);
985	break;
986	case CPUMMODE_LONG:
987	cbPtr = sizeof(uint64_t);
988	break;
989	default:
990	AssertMsgFailed(("Invalid CPU mode %u\n", enmMode));
991	}
992
993	if (pDisParam->fUse & DISUSE_BASE)
994	{
995	uint8_t idxRegBase = pDisParam->Base.idxGenReg;
996
997	/* Check that the used register size and the pointer size match. */
998	if ( ((pDisParam->fUse & DISUSE_REG_GEN16) && cbPtr == sizeof(uint16_t))
999	\|\| ((pDisParam->fUse & DISUSE_REG_GEN32) && cbPtr == sizeof(uint32_t))
1000	\|\| ((pDisParam->fUse & DISUSE_REG_GEN64) && cbPtr == sizeof(uint64_t)))
1001	{
1002	/*
1003	* Search all instructions backwards until a move to the used general register
1004	* is detected with a constant using the pointer size.
1005	*/
1006	uint32_t idxInstrStart = pFlowBb->cInstr - 1 - 1; /* Don't look at the branch. */
1007	bool fCandidateFound = false;
1008	bool fBranchTbl = RT_BOOL(pDisParam->fUse & DISUSE_INDEX);
1009	DBGFADDRESS AddrBranchTgt;
1010	do
1011	{
1012	fCandidateFound = dbgfR3FlowSearchMovWithConstantPtrSizeBackwards(pFlowBb, idxRegBase, cbPtr,
1013	pUVM, idCpu, fFlagsDisasm,
1014	&idxInstrStart, &AddrBranchTgt);
1015	if (fCandidateFound)
1016	{
1017	/* Check that the address is not too far away from the instruction address. */
1018	RTGCUINTPTR offPtr = dbgfR3FlowAddrGetDistance(&AddrBranchTgt, &pFlowBb->AddrEnd);
1019	if (offPtr <= 20 * _1M)
1020	{
1021	/* Read the content at the address and check that it is near this basic block too. */
1022	int rc = dbgfR3FlowCheckBranchTargetLocation(pThis, pFlowBb, &AddrBranchTgt, idxRegBase,
1023	cbPtr, pUVM, idCpu, fBranchTbl);
1024	if (RT_SUCCESS(rc))
1025	break;
1026	fCandidateFound = false;
1027	}
1028
1029	if (idxInstrStart > 0)
1030	idxInstrStart--;
1031	}
1032	} while (idxInstrStart > 0 && !fCandidateFound);
1033	}
1034	else
1035	dbgfR3FlowBbSetError(pFlowBb, VERR_INVALID_STATE,
1036	"The base register size and selected pointer size do not match (fUse=%#x cbPtr=%u)",
1037	pDisParam->fUse, cbPtr);
1038	}
1039
1040	return VINF_SUCCESS;
1041	}
1042
1043
1044	/**
1045	* Tries to resolve the indirect branch.
1046	*
1047	* @returns VBox status code.
1048	* @param pThis The flow control graph.
1049	* @param pFlowBb The basic block causing the indirect branch.
1050	* @param pUVM The user mode VM handle.
1051	* @param idCpu CPU id for disassembling.
1052	* @param pDisParam The parameter from the disassembler.
1053	* @param fFlagsDisasm Flags for the disassembler.
1054	*/
1055	static int dbgfR3FlowBbCheckBranchTblCandidate(PDBGFFLOWINT pThis, PDBGFFLOWBBINT pFlowBb, PUVM pUVM,
1056	VMCPUID idCpu, PDISOPPARAM pDisParam, uint32_t fFlagsDisasm)
1057	{
1058	int rc = VINF_SUCCESS;
1059
1060	Assert(pFlowBb->fFlags & DBGF_FLOW_BB_F_BRANCH_TABLE && pFlowBb->pFlowBranchTbl);
1061
1062	uint32_t cbPtr = 0;
1063	CPUMMODE enmMode = dbgfR3FlowGetDisasCpuMode(pUVM, idCpu, fFlagsDisasm);
1064
1065	switch (enmMode)
1066	{
1067	case CPUMMODE_REAL:
1068	cbPtr = sizeof(uint16_t);
1069	break;
1070	case CPUMMODE_PROTECTED:
1071	cbPtr = sizeof(uint32_t);
1072	break;
1073	case CPUMMODE_LONG:
1074	cbPtr = sizeof(uint64_t);
1075	break;
1076	default:
1077	AssertMsgFailed(("Invalid CPU mode %u\n", enmMode));
1078	}
1079
1080	if (pDisParam->fUse & DISUSE_BASE)
1081	{
1082	uint8_t idxRegBase = pDisParam->Base.idxGenReg;
1083
1084	/* Check that the used register size and the pointer size match. */
1085	if ( ((pDisParam->fUse & DISUSE_REG_GEN16) && cbPtr == sizeof(uint16_t))
1086	\|\| ((pDisParam->fUse & DISUSE_REG_GEN32) && cbPtr == sizeof(uint32_t))
1087	\|\| ((pDisParam->fUse & DISUSE_REG_GEN64) && cbPtr == sizeof(uint64_t)))
1088	{
1089	if (idxRegBase != pFlowBb->pFlowBranchTbl->idxGenRegBase)
1090	{
1091	/* Try to find the new branch table. */
1092	pFlowBb->pFlowBranchTbl = NULL;
1093	rc = dbgfR3FlowTryResolveIndirectBranch(pThis, pFlowBb, pUVM, idCpu, pDisParam, fFlagsDisasm);
1094	}
1095	/** @todo else check that the base register is not modified in this basic block. */
1096	}
1097	else
1098	dbgfR3FlowBbSetError(pFlowBb, VERR_INVALID_STATE,
1099	"The base register size and selected pointer size do not match (fUse=%#x cbPtr=%u)",
1100	pDisParam->fUse, cbPtr);
1101	}
1102	else
1103	dbgfR3FlowBbSetError(pFlowBb, VERR_INVALID_STATE,
1104	"The instruction does not use a register");
1105
1106	return rc;
1107	}
1108
1109
1110	/**
1111	* Processes and fills one basic block.
1112	*
1113	* @returns VBox status code.
1114	* @param pUVM The user mode VM handle.
1115	* @param idCpu CPU id for disassembling.
1116	* @param pThis The control flow graph to populate.
1117	* @param pFlowBb The basic block to fill.
1118	* @param cbDisasmMax The maximum amount to disassemble.
1119	* @param fFlags Combination of DBGF_DISAS_FLAGS_*.
1120	*/
1121	static int dbgfR3FlowBbProcess(PUVM pUVM, VMCPUID idCpu, PDBGFFLOWINT pThis, PDBGFFLOWBBINT pFlowBb,
1122	uint32_t cbDisasmMax, uint32_t fFlags)
1123	{
1124	int rc = VINF_SUCCESS;
1125	uint32_t cbDisasmLeft = cbDisasmMax ? cbDisasmMax : UINT32_MAX;
1126	DBGFADDRESS AddrDisasm = pFlowBb->AddrEnd;
1127
1128	Assert(pFlowBb->fFlags & DBGF_FLOW_BB_F_EMPTY);
1129
1130	/*
1131	* Disassemble instruction by instruction until we get a conditional or
1132	* unconditional jump or some sort of return.
1133	*/
1134	while ( cbDisasmLeft
1135	&& RT_SUCCESS(rc))
1136	{
1137	DBGFDISSTATE DisState;
1138	char szOutput[_4K];
1139
1140	/*
1141	* Before disassembling we have to check whether the address belongs
1142	* to another basic block and stop here.
1143	*/
1144	if ( !(pFlowBb->fFlags & DBGF_FLOW_BB_F_EMPTY)
1145	&& dbgfR3FlowHasBbWithStartAddr(pThis, &AddrDisasm))
1146	{
1147	pFlowBb->AddrTarget = AddrDisasm;
1148	pFlowBb->enmEndType = DBGFFLOWBBENDTYPE_UNCOND;
1149	break;
1150	}
1151
1152	rc = dbgfR3DisasInstrStateEx(pUVM, idCpu, &AddrDisasm, fFlags,
1153	&szOutput[0], sizeof(szOutput), &DisState);
1154	if (RT_SUCCESS(rc))
1155	{
1156	if ( pThis->fFlags & DBGF_FLOW_CREATE_F_CALL_INSN_SEPARATE_BB
1157	&& DisState.pCurInstr->uOpcode == OP_CALL
1158	&& !(pFlowBb->fFlags & DBGF_FLOW_BB_F_EMPTY))
1159	{
1160	/*
1161	* If the basic block is not empty, the basic block is terminated and the successor is added
1162	* which will contain the call instruction.
1163	*/
1164	pFlowBb->AddrTarget = AddrDisasm;
1165	pFlowBb->enmEndType = DBGFFLOWBBENDTYPE_UNCOND;
1166	rc = dbgfR3FlowBbSuccessorAdd(pThis, &AddrDisasm,
1167	(pFlowBb->fFlags & DBGF_FLOW_BB_F_BRANCH_TABLE),
1168	pFlowBb->pFlowBranchTbl);
1169	if (RT_FAILURE(rc))
1170	dbgfR3FlowBbSetError(pFlowBb, rc, "Adding successor blocks failed with %Rrc", rc);
1171	break;
1172	}
1173
1174	pFlowBb->fFlags &= ~DBGF_FLOW_BB_F_EMPTY;
1175	cbDisasmLeft -= DisState.cbInstr;
1176
1177	if (pFlowBb->cInstr == pFlowBb->cInstrMax)
1178	{
1179	/* Reallocate. */
1180	RTListNodeRemove(&pFlowBb->NdFlowBb);
1181	PDBGFFLOWBBINT pFlowBbNew = (PDBGFFLOWBBINT)RTMemRealloc(pFlowBb,
1182	RT_UOFFSETOF_DYN(DBGFFLOWBBINT, aInstr[pFlowBb->cInstrMax + 10]));
1183	if (pFlowBbNew)
1184	{
1185	pFlowBbNew->cInstrMax += 10;
1186	pFlowBb = pFlowBbNew;
1187	}
1188	else
1189	rc = VERR_NO_MEMORY;
1190	RTListAppend(&pThis->LstFlowBb, &pFlowBb->NdFlowBb);
1191	}
1192
1193	if (RT_SUCCESS(rc))
1194	{
1195	PDBGFFLOWBBINSTR pInstr = &pFlowBb->aInstr[pFlowBb->cInstr];
1196
1197	pInstr->AddrInstr = AddrDisasm;
1198	pInstr->cbInstr = DisState.cbInstr;
1199	pInstr->pszInstr = RTStrCacheEnter(pThis->hStrCacheInstr, &szOutput[0]);
1200	pFlowBb->cInstr++;
1201
1202	pFlowBb->AddrEnd = AddrDisasm;
1203	DBGFR3AddrAdd(&pFlowBb->AddrEnd, pInstr->cbInstr - 1);
1204	DBGFR3AddrAdd(&AddrDisasm, pInstr->cbInstr);
1205
1206	/*
1207	* Check control flow instructions and create new basic blocks
1208	* marking the current one as complete.
1209	*/
1210	if (DisState.pCurInstr->fOpType & DISOPTYPE_CONTROLFLOW)
1211	{
1212	uint16_t uOpc = DisState.pCurInstr->uOpcode;
1213
1214	if (uOpc == OP_CALL)
1215	pThis->cCallInsns++;
1216
1217	if ( uOpc == OP_RETN \|\| uOpc == OP_RETF \|\| uOpc == OP_IRET
1218	\|\| uOpc == OP_SYSEXIT \|\| uOpc == OP_SYSRET)
1219	pFlowBb->enmEndType = DBGFFLOWBBENDTYPE_EXIT;
1220	else if (uOpc == OP_JMP)
1221	{
1222	Assert(DisState.pCurInstr->fOpType & DISOPTYPE_UNCOND_CONTROLFLOW);
1223
1224	if (dbgfR3FlowBranchTargetIsIndirect(&DisState.Param1))
1225	{
1226	pFlowBb->enmEndType = DBGFFLOWBBENDTYPE_UNCOND_INDIRECT_JMP;
1227
1228	if (pFlowBb->fFlags & DBGF_FLOW_BB_F_BRANCH_TABLE)
1229	{
1230	Assert(pThis->fFlags & DBGF_FLOW_CREATE_F_TRY_RESOLVE_INDIRECT_BRANCHES);
1231
1232	/*
1233	* This basic block was already discovered by parsing a jump table and
1234	* there should be a candidate for the branch table. Check whether it uses the
1235	* same branch table.
1236	*/
1237	rc = dbgfR3FlowBbCheckBranchTblCandidate(pThis, pFlowBb, pUVM, idCpu,
1238	&DisState.Param1, fFlags);
1239	}
1240	else
1241	{
1242	if (pThis->fFlags & DBGF_FLOW_CREATE_F_TRY_RESOLVE_INDIRECT_BRANCHES)
1243	rc = dbgfR3FlowTryResolveIndirectBranch(pThis, pFlowBb, pUVM, idCpu,
1244	&DisState.Param1, fFlags);
1245	else
1246	dbgfR3FlowBbSetError(pFlowBb, VERR_NOT_SUPPORTED,
1247	"Detected indirect branch and resolving it not being enabled");
1248	}
1249	}
1250	else
1251	{
1252	pFlowBb->enmEndType = DBGFFLOWBBENDTYPE_UNCOND_JMP;
1253
1254	/* Create one new basic block with the jump target address. */
1255	rc = dbgfR3FlowQueryDirectBranchTarget(pUVM, idCpu, &DisState.Param1, &pInstr->AddrInstr, pInstr->cbInstr,
1256	RT_BOOL(DisState.pCurInstr->fOpType & DISOPTYPE_RELATIVE_CONTROLFLOW),
1257	&pFlowBb->AddrTarget);
1258	if (RT_SUCCESS(rc))
1259	rc = dbgfR3FlowBbSuccessorAdd(pThis, &pFlowBb->AddrTarget,
1260	(pFlowBb->fFlags & DBGF_FLOW_BB_F_BRANCH_TABLE),
1261	pFlowBb->pFlowBranchTbl);
1262	}
1263	}
1264	else if (uOpc != OP_CALL)
1265	{
1266	Assert(DisState.pCurInstr->fOpType & DISOPTYPE_COND_CONTROLFLOW);
1267	pFlowBb->enmEndType = DBGFFLOWBBENDTYPE_COND;
1268
1269	/*
1270	* Create two new basic blocks, one with the jump target address
1271	* and one starting after the current instruction.
1272	*/
1273	rc = dbgfR3FlowBbSuccessorAdd(pThis, &AddrDisasm,
1274	(pFlowBb->fFlags & DBGF_FLOW_BB_F_BRANCH_TABLE),
1275	pFlowBb->pFlowBranchTbl);
1276	if (RT_SUCCESS(rc))
1277	{
1278	rc = dbgfR3FlowQueryDirectBranchTarget(pUVM, idCpu, &DisState.Param1, &pInstr->AddrInstr, pInstr->cbInstr,
1279	RT_BOOL(DisState.pCurInstr->fOpType & DISOPTYPE_RELATIVE_CONTROLFLOW),
1280	&pFlowBb->AddrTarget);
1281	if (RT_SUCCESS(rc))
1282	rc = dbgfR3FlowBbSuccessorAdd(pThis, &pFlowBb->AddrTarget,
1283	(pFlowBb->fFlags & DBGF_FLOW_BB_F_BRANCH_TABLE),
1284	pFlowBb->pFlowBranchTbl);
1285	}
1286	}
1287	else if (pThis->fFlags & DBGF_FLOW_CREATE_F_CALL_INSN_SEPARATE_BB)
1288	{
1289	pFlowBb->enmEndType = DBGFFLOWBBENDTYPE_UNCOND;
1290	pFlowBb->fFlags \|= DBGF_FLOW_BB_F_CALL_INSN;
1291
1292	/* Add new basic block coming after the call instruction. */
1293	rc = dbgfR3FlowBbSuccessorAdd(pThis, &AddrDisasm,
1294	(pFlowBb->fFlags & DBGF_FLOW_BB_F_BRANCH_TABLE),
1295	pFlowBb->pFlowBranchTbl);
1296	if ( RT_SUCCESS(rc)
1297	&& !dbgfR3FlowBranchTargetIsIndirect(&DisState.Param1))
1298	{
1299	/* Resolve the branch target. */
1300	rc = dbgfR3FlowQueryDirectBranchTarget(pUVM, idCpu, &DisState.Param1, &pInstr->AddrInstr, pInstr->cbInstr,
1301	RT_BOOL(DisState.pCurInstr->fOpType & DISOPTYPE_RELATIVE_CONTROLFLOW),
1302	&pFlowBb->AddrTarget);
1303	if (RT_SUCCESS(rc))
1304	pFlowBb->fFlags \|= DBGF_FLOW_BB_F_CALL_INSN_TARGET_KNOWN;
1305	}
1306	}
1307
1308	if (RT_FAILURE(rc))
1309	dbgfR3FlowBbSetError(pFlowBb, rc, "Adding successor blocks failed with %Rrc", rc);
1310
1311	/* Quit disassembling. */
1312	if ( ( uOpc != OP_CALL
1313	\|\| (pThis->fFlags & DBGF_FLOW_CREATE_F_CALL_INSN_SEPARATE_BB))
1314	\|\| RT_FAILURE(rc))
1315	break;
1316	}
1317	}
1318	else
1319	dbgfR3FlowBbSetError(pFlowBb, rc, "Increasing basic block failed with %Rrc", rc);
1320	}
1321	else
1322	dbgfR3FlowBbSetError(pFlowBb, rc, "Disassembling the instruction failed with %Rrc", rc);
1323	}
1324
1325	return VINF_SUCCESS;
1326	}
1327
1328	/**
1329	* Populate all empty basic blocks.
1330	*
1331	* @returns VBox status code.
1332	* @param pUVM The user mode VM handle.
1333	* @param idCpu CPU id for disassembling.
1334	* @param pThis The control flow graph to populate.
1335	* @param cbDisasmMax The maximum amount to disassemble.
1336	* @param fFlags Combination of DBGF_DISAS_FLAGS_*.
1337	*/
1338	static int dbgfR3FlowPopulate(PUVM pUVM, VMCPUID idCpu, PDBGFFLOWINT pThis, uint32_t cbDisasmMax, uint32_t fFlags)
1339	{
1340	int rc = VINF_SUCCESS;
1341	PDBGFFLOWBBINT pFlowBb = dbgfR3FlowGetUnpopulatedBb(pThis);
1342
1343	while (pFlowBb != NULL)
1344	{
1345	rc = dbgfR3FlowBbProcess(pUVM, idCpu, pThis, pFlowBb, cbDisasmMax, fFlags);
1346	if (RT_FAILURE(rc))
1347	break;
1348
1349	pFlowBb = dbgfR3FlowGetUnpopulatedBb(pThis);
1350	}
1351
1352	return rc;
1353	}
1354
1355	/**
1356	* Creates a new control flow graph from the given start address.
1357	*
1358	* @returns VBox status code.
1359	* @param pUVM The user mode VM handle.
1360	* @param idCpu CPU id for disassembling.
1361	* @param pAddressStart Where to start creating the control flow graph.
1362	* @param cbDisasmMax Limit the amount of bytes to disassemble, 0 for no limit.
1363	* @param fFlagsFlow Combination of DBGF_FLOW_CREATE_F_* to control the creation of the flow graph.
1364	* @param fFlagsDisasm Combination of DBGF_DISAS_FLAGS_* controlling the style of the disassembled
1365	* instructions.
1366	* @param phFlow Where to store the handle to the control flow graph on success.
1367	*/
1368	VMMR3DECL(int) DBGFR3FlowCreate(PUVM pUVM, VMCPUID idCpu, PDBGFADDRESS pAddressStart, uint32_t cbDisasmMax,
1369	uint32_t fFlagsFlow, uint32_t fFlagsDisasm, PDBGFFLOW phFlow)
1370	{
1371	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
1372	PVM pVM = pUVM->pVM;
1373	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
1374	AssertReturn(idCpu < pUVM->cCpus, VERR_INVALID_CPU_ID);
1375	AssertPtrReturn(pAddressStart, VERR_INVALID_POINTER);
1376	AssertReturn(!(fFlagsDisasm & ~DBGF_DISAS_FLAGS_VALID_MASK), VERR_INVALID_PARAMETER);
1377	AssertReturn((fFlagsDisasm & DBGF_DISAS_FLAGS_MODE_MASK) <= DBGF_DISAS_FLAGS_64BIT_MODE, VERR_INVALID_PARAMETER);
1378
1379	/* Create the control flow graph container. */
1380	int rc = VINF_SUCCESS;
1381	PDBGFFLOWINT pThis = (PDBGFFLOWINT)RTMemAllocZ(sizeof(DBGFFLOWINT));
1382	if (RT_LIKELY(pThis))
1383	{
1384	rc = RTStrCacheCreate(&pThis->hStrCacheInstr, "DBGFFLOW");
1385	if (RT_SUCCESS(rc))
1386	{
1387	pThis->cRefs = 1;
1388	pThis->cRefsBb = 0;
1389	pThis->cBbs = 0;
1390	pThis->cBranchTbls = 0;
1391	pThis->cCallInsns = 0;
1392	pThis->fFlags = fFlagsFlow;
1393	RTListInit(&pThis->LstFlowBb);
1394	RTListInit(&pThis->LstBranchTbl);
1395	/* Create the entry basic block and start the work. */
1396
1397	PDBGFFLOWBBINT pFlowBb = dbgfR3FlowBbCreate(pThis, pAddressStart, DBGF_FLOW_BB_F_ENTRY, 10);
1398	if (RT_LIKELY(pFlowBb))
1399	{
1400	dbgfR3FlowLink(pThis, pFlowBb);
1401	rc = dbgfR3FlowPopulate(pUVM, idCpu, pThis, cbDisasmMax, fFlagsDisasm);
1402	if (RT_SUCCESS(rc))
1403	{
1404	*phFlow = pThis;
1405	return VINF_SUCCESS;
1406	}
1407	}
1408	else
1409	rc = VERR_NO_MEMORY;
1410	}
1411
1412	ASMAtomicDecU32(&pThis->cRefs);
1413	dbgfR3FlowDestroy(pThis);
1414	}
1415	else
1416	rc = VERR_NO_MEMORY;
1417
1418	return rc;
1419	}
1420
1421
1422	/**
1423	* Retains the control flow graph handle.
1424	*
1425	* @returns Current reference count.
1426	* @param hFlow The control flow graph handle to retain.
1427	*/
1428	VMMR3DECL(uint32_t) DBGFR3FlowRetain(DBGFFLOW hFlow)
1429	{
1430	PDBGFFLOWINT pThis = hFlow;
1431	AssertPtrReturn(pThis, UINT32_MAX);
1432
1433	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
1434	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1435	return cRefs;
1436	}
1437
1438
1439	/**
1440	* Releases the control flow graph handle.
1441	*
1442	* @returns Current reference count, on 0 the control flow graph will be destroyed.
1443	* @param hFlow The control flow graph handle to release.
1444	*/
1445	VMMR3DECL(uint32_t) DBGFR3FlowRelease(DBGFFLOW hFlow)
1446	{
1447	PDBGFFLOWINT pThis = hFlow;
1448	if (!pThis)
1449	return 0;
1450	AssertPtrReturn(pThis, UINT32_MAX);
1451
1452	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
1453	AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
1454	if (cRefs == 0)
1455	dbgfR3FlowDestroy(pThis);
1456	return cRefs;
1457	}
1458
1459
1460	/**
1461	* Queries the basic block denoting the entry point into the control flow graph.
1462	*
1463	* @returns VBox status code.
1464	* @param hFlow The control flow graph handle.
1465	* @param phFlowBb Where to store the basic block handle on success.
1466	*/
1467	VMMR3DECL(int) DBGFR3FlowQueryStartBb(DBGFFLOW hFlow, PDBGFFLOWBB phFlowBb)
1468	{
1469	PDBGFFLOWINT pThis = hFlow;
1470	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1471
1472	PDBGFFLOWBBINT pFlowBb;
1473	RTListForEach(&pThis->LstFlowBb, pFlowBb, DBGFFLOWBBINT, NdFlowBb)
1474	{
1475	if (pFlowBb->fFlags & DBGF_FLOW_BB_F_ENTRY)
1476	{
1477	*phFlowBb = pFlowBb;
1478	return VINF_SUCCESS;
1479	}
1480	}
1481
1482	AssertFailed(); /* Should never get here. */
1483	return VERR_INTERNAL_ERROR;
1484	}
1485
1486
1487	/**
1488	* Queries a basic block in the given control flow graph which covers the given
1489	* address.
1490	*
1491	* @returns VBox status code.
1492	* @retval VERR_NOT_FOUND if there is no basic block intersecting with the address.
1493	* @param hFlow The control flow graph handle.
1494	* @param pAddr The address to look for.
1495	* @param phFlowBb Where to store the basic block handle on success.
1496	*/
1497	VMMR3DECL(int) DBGFR3FlowQueryBbByAddress(DBGFFLOW hFlow, PDBGFADDRESS pAddr, PDBGFFLOWBB phFlowBb)
1498	{
1499	PDBGFFLOWINT pThis = hFlow;
1500	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1501	AssertPtrReturn(pAddr, VERR_INVALID_POINTER);
1502	AssertPtrReturn(phFlowBb, VERR_INVALID_POINTER);
1503
1504	PDBGFFLOWBBINT pFlowBb;
1505	RTListForEach(&pThis->LstFlowBb, pFlowBb, DBGFFLOWBBINT, NdFlowBb)
1506	{
1507	if (dbgfR3FlowAddrIntersect(pFlowBb, pAddr))
1508	{
1509	DBGFR3FlowBbRetain(pFlowBb);
1510	*phFlowBb = pFlowBb;
1511	return VINF_SUCCESS;
1512	}
1513	}
1514
1515	return VERR_NOT_FOUND;
1516	}
1517
1518
1519	/**
1520	* Queries a branch table in the given control flow graph by the given address.
1521	*
1522	* @returns VBox status code.
1523	* @retval VERR_NOT_FOUND if there is no branch table with the given address.
1524	* @param hFlow The control flow graph handle.
1525	* @param pAddr The address of the branch table.
1526	* @param phFlowBranchTbl Where to store the handle to branch table on success.
1527	*
1528	* @note Call DBGFR3FlowBranchTblRelease() when the handle is not required anymore.
1529	*/
1530	VMMR3DECL(int) DBGFR3FlowQueryBranchTblByAddress(DBGFFLOW hFlow, PDBGFADDRESS pAddr, PDBGFFLOWBRANCHTBL phFlowBranchTbl)
1531	{
1532	PDBGFFLOWINT pThis = hFlow;
1533	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
1534	AssertPtrReturn(pAddr, VERR_INVALID_POINTER);
1535	AssertPtrReturn(phFlowBranchTbl, VERR_INVALID_POINTER);
1536
1537	PDBGFFLOWBRANCHTBLINT pBranchTbl = dbgfR3FlowBranchTblFindByAddr(pThis, pAddr);
1538	if (pBranchTbl)
1539	{
1540	DBGFR3FlowBranchTblRetain(pBranchTbl);
1541	*phFlowBranchTbl = pBranchTbl;
1542	return VINF_SUCCESS;
1543	}
1544
1545	return VERR_NOT_FOUND;
1546	}
1547
1548
1549	/**
1550	* Returns the number of basic blcoks inside the control flow graph.
1551	*
1552	* @returns Number of basic blocks.
1553	* @param hFlow The control flow graph handle.
1554	*/
1555	VMMR3DECL(uint32_t) DBGFR3FlowGetBbCount(DBGFFLOW hFlow)
1556	{
1557	PDBGFFLOWINT pThis = hFlow;
1558	AssertPtrReturn(pThis, 0);
1559
1560	return pThis->cBbs;
1561	}
1562
1563
1564	/**
1565	* Returns the number of branch tables inside the control flow graph.
1566	*
1567	* @returns Number of basic blocks.
1568	* @param hFlow The control flow graph handle.
1569	*/
1570	VMMR3DECL(uint32_t) DBGFR3FlowGetBranchTblCount(DBGFFLOW hFlow)
1571	{
1572	PDBGFFLOWINT pThis = hFlow;
1573	AssertPtrReturn(pThis, 0);
1574
1575	return pThis->cBranchTbls;
1576	}
1577
1578
1579	/**
1580	* Returns the number of call instructions encountered in the given
1581	* control flow graph.
1582	*
1583	* @returns Number of call instructions.
1584	* @param hFlow The control flow graph handle.
1585	*/
1586	VMMR3DECL(uint32_t) DBGFR3FlowGetCallInsnCount(DBGFFLOW hFlow)
1587	{
1588	PDBGFFLOWINT pThis = hFlow;
1589	AssertPtrReturn(pThis, 0);
1590
1591	return pThis->cCallInsns;
1592	}
1593
1594
1595	/**
1596	* Retains the basic block handle.
1597	*
1598	* @returns Current reference count.
1599	* @param hFlowBb The basic block handle to retain.
1600	*/
1601	VMMR3DECL(uint32_t) DBGFR3FlowBbRetain(DBGFFLOWBB hFlowBb)
1602	{
1603	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1604	AssertPtrReturn(pFlowBb, UINT32_MAX);
1605
1606	uint32_t cRefs = ASMAtomicIncU32(&pFlowBb->cRefs);
1607	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p %d\n", cRefs, pFlowBb, pFlowBb->enmEndType));
1608	return cRefs;
1609	}
1610
1611
1612	/**
1613	* Releases the basic block handle.
1614	*
1615	* @returns Current reference count, on 0 the basic block will be destroyed.
1616	* @param hFlowBb The basic block handle to release.
1617	*/
1618	VMMR3DECL(uint32_t) DBGFR3FlowBbRelease(DBGFFLOWBB hFlowBb)
1619	{
1620	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1621	if (!pFlowBb)
1622	return 0;
1623
1624	return dbgfR3FlowBbReleaseInt(pFlowBb, true /* fMayDestroyFlow */);
1625	}
1626
1627
1628	/**
1629	* Returns the start address of the basic block.
1630	*
1631	* @returns Pointer to DBGF adress containing the start address of the basic block.
1632	* @param hFlowBb The basic block handle.
1633	* @param pAddrStart Where to store the start address of the basic block.
1634	*/
1635	VMMR3DECL(PDBGFADDRESS) DBGFR3FlowBbGetStartAddress(DBGFFLOWBB hFlowBb, PDBGFADDRESS pAddrStart)
1636	{
1637	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1638	AssertPtrReturn(pFlowBb, NULL);
1639	AssertPtrReturn(pAddrStart, NULL);
1640
1641	*pAddrStart = pFlowBb->AddrStart;
1642	return pAddrStart;
1643	}
1644
1645
1646	/**
1647	* Returns the end address of the basic block (inclusive).
1648	*
1649	* @returns Pointer to DBGF adress containing the end address of the basic block.
1650	* @param hFlowBb The basic block handle.
1651	* @param pAddrEnd Where to store the end address of the basic block.
1652	*/
1653	VMMR3DECL(PDBGFADDRESS) DBGFR3FlowBbGetEndAddress(DBGFFLOWBB hFlowBb, PDBGFADDRESS pAddrEnd)
1654	{
1655	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1656	AssertPtrReturn(pFlowBb, NULL);
1657	AssertPtrReturn(pAddrEnd, NULL);
1658
1659	*pAddrEnd = pFlowBb->AddrEnd;
1660	return pAddrEnd;
1661	}
1662
1663
1664	/**
1665	* Returns the address the last instruction in the basic block branches to.
1666	*
1667	* @returns Pointer to DBGF adress containing the branch address of the basic block.
1668	* @param hFlowBb The basic block handle.
1669	* @param pAddrTarget Where to store the branch address of the basic block.
1670	*
1671	* @note This is only valid for unconditional or conditional branches, or for a basic block
1672	* containing only a call instruction when DBGF_FLOW_CREATE_F_CALL_INSN_SEPARATE_BB was given
1673	* during creation and the branch target could be deduced as indicated by the DBGF_FLOW_BB_F_CALL_INSN_TARGET_KNOWN
1674	* flag for the basic block. This method will assert for every other basic block type.
1675	* @note For indirect unconditional branches using a branch table this will return the start address
1676	* of the branch table.
1677	*/
1678	VMMR3DECL(PDBGFADDRESS) DBGFR3FlowBbGetBranchAddress(DBGFFLOWBB hFlowBb, PDBGFADDRESS pAddrTarget)
1679	{
1680	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1681	AssertPtrReturn(pFlowBb, NULL);
1682	AssertPtrReturn(pAddrTarget, NULL);
1683	AssertReturn( pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_UNCOND_JMP
1684	\|\| pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_COND
1685	\|\| pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_UNCOND_INDIRECT_JMP
1686	\|\| ( pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_UNCOND
1687	&& (pFlowBb->fFlags & DBGF_FLOW_BB_F_CALL_INSN_TARGET_KNOWN)),
1688	NULL);
1689
1690	if ( pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_UNCOND_INDIRECT_JMP
1691	&& pFlowBb->pFlowBranchTbl)
1692	*pAddrTarget = pFlowBb->pFlowBranchTbl->AddrStart;
1693	else
1694	*pAddrTarget = pFlowBb->AddrTarget;
1695	return pAddrTarget;
1696	}
1697
1698
1699	/**
1700	* Returns the address of the next block following this one in the instruction stream.
1701	* (usually end address + 1).
1702	*
1703	* @returns Pointer to DBGF adress containing the following address of the basic block.
1704	* @param hFlowBb The basic block handle.
1705	* @param pAddrFollow Where to store the following address of the basic block.
1706	*
1707	* @note This is only valid for conditional branches and if the last instruction in the
1708	* given basic block doesn't change the control flow but the blocks were split
1709	* because the successor is referenced by multiple other blocks as an entry point.
1710	*/
1711	VMMR3DECL(PDBGFADDRESS) DBGFR3FlowBbGetFollowingAddress(DBGFFLOWBB hFlowBb, PDBGFADDRESS pAddrFollow)
1712	{
1713	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1714	AssertPtrReturn(pFlowBb, NULL);
1715	AssertPtrReturn(pAddrFollow, NULL);
1716	AssertReturn( pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_UNCOND
1717	\|\| pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_COND,
1718	NULL);
1719
1720	*pAddrFollow = pFlowBb->AddrEnd;
1721	DBGFR3AddrAdd(pAddrFollow, 1);
1722	return pAddrFollow;
1723	}
1724
1725
1726	/**
1727	* Returns the type of the last instruction in the basic block.
1728	*
1729	* @returns Last instruction type.
1730	* @param hFlowBb The basic block handle.
1731	*/
1732	VMMR3DECL(DBGFFLOWBBENDTYPE) DBGFR3FlowBbGetType(DBGFFLOWBB hFlowBb)
1733	{
1734	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1735	AssertPtrReturn(pFlowBb, DBGFFLOWBBENDTYPE_INVALID);
1736
1737	return pFlowBb->enmEndType;
1738	}
1739
1740
1741	/**
1742	* Get the number of instructions contained in the basic block.
1743	*
1744	* @returns Number of instructions in the basic block.
1745	* @param hFlowBb The basic block handle.
1746	*/
1747	VMMR3DECL(uint32_t) DBGFR3FlowBbGetInstrCount(DBGFFLOWBB hFlowBb)
1748	{
1749	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1750	AssertPtrReturn(pFlowBb, 0);
1751
1752	return pFlowBb->cInstr;
1753	}
1754
1755
1756	/**
1757	* Get flags for the given basic block.
1758	*
1759	* @returns Combination of DBGF_FLOW_BB_F_*
1760	* @param hFlowBb The basic block handle.
1761	*/
1762	VMMR3DECL(uint32_t) DBGFR3FlowBbGetFlags(DBGFFLOWBB hFlowBb)
1763	{
1764	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1765	AssertPtrReturn(pFlowBb, 0);
1766
1767	return pFlowBb->fFlags;
1768	}
1769
1770
1771	/**
1772	* Queries the branch table used if the given basic block ends with an indirect branch
1773	* and has a branch table referenced.
1774	*
1775	* @returns VBox status code.
1776	* @param hFlowBb The basic block handle.
1777	* @param phBranchTbl Where to store the branch table handle on success.
1778	*
1779	* @note Release the branch table reference with DBGFR3FlowBranchTblRelease() when not required
1780	* anymore.
1781	*/
1782	VMMR3DECL(int) DBGFR3FlowBbQueryBranchTbl(DBGFFLOWBB hFlowBb, PDBGFFLOWBRANCHTBL phBranchTbl)
1783	{
1784	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1785	AssertPtrReturn(pFlowBb, VERR_INVALID_HANDLE);
1786	AssertReturn(pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_UNCOND_INDIRECT_JMP, VERR_INVALID_STATE);
1787	AssertPtrReturn(pFlowBb->pFlowBranchTbl, VERR_INVALID_STATE);
1788	AssertPtrReturn(phBranchTbl, VERR_INVALID_POINTER);
1789
1790	DBGFR3FlowBranchTblRetain(pFlowBb->pFlowBranchTbl);
1791	*phBranchTbl = pFlowBb->pFlowBranchTbl;
1792	return VINF_SUCCESS;
1793	}
1794
1795
1796	/**
1797	* Returns the error status and message if the given basic block has an error.
1798	*
1799	* @returns VBox status code of the error for the basic block.
1800	* @param hFlowBb The basic block handle.
1801	* @param ppszErr Where to store the pointer to the error message - optional.
1802	*/
1803	VMMR3DECL(int) DBGFR3FlowBbQueryError(DBGFFLOWBB hFlowBb, const char **ppszErr)
1804	{
1805	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1806	AssertPtrReturn(pFlowBb, VERR_INVALID_HANDLE);
1807
1808	if (ppszErr)
1809	*ppszErr = pFlowBb->pszErr;
1810
1811	return pFlowBb->rcError;
1812	}
1813
1814
1815	/**
1816	* Store the disassembled instruction as a string in the given output buffer.
1817	*
1818	* @returns VBox status code.
1819	* @param hFlowBb The basic block handle.
1820	* @param idxInstr The instruction to query.
1821	* @param pAddrInstr Where to store the guest instruction address on success, optional.
1822	* @param pcbInstr Where to store the instruction size on success, optional.
1823	* @param ppszInstr Where to store the pointer to the disassembled instruction string, optional.
1824	*/
1825	VMMR3DECL(int) DBGFR3FlowBbQueryInstr(DBGFFLOWBB hFlowBb, uint32_t idxInstr, PDBGFADDRESS pAddrInstr,
1826	uint32_t pcbInstr, const char *ppszInstr)
1827	{
1828	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1829	AssertPtrReturn(pFlowBb, VERR_INVALID_POINTER);
1830	AssertReturn(idxInstr < pFlowBb->cInstr, VERR_INVALID_PARAMETER);
1831
1832	if (pAddrInstr)
1833	*pAddrInstr = pFlowBb->aInstr[idxInstr].AddrInstr;
1834	if (pcbInstr)
1835	*pcbInstr = pFlowBb->aInstr[idxInstr].cbInstr;
1836	if (ppszInstr)
1837	*ppszInstr = pFlowBb->aInstr[idxInstr].pszInstr;
1838
1839	return VINF_SUCCESS;
1840	}
1841
1842
1843	/**
1844	* Queries the successors of the basic block.
1845	*
1846	* @returns VBox status code.
1847	* @param hFlowBb The basic block handle.
1848	* @param phFlowBbFollow Where to store the handle to the basic block following
1849	* this one (optional).
1850	* @param phFlowBbTarget Where to store the handle to the basic block being the
1851	* branch target for this one (optional).
1852	*/
1853	VMMR3DECL(int) DBGFR3FlowBbQuerySuccessors(DBGFFLOWBB hFlowBb, PDBGFFLOWBB phFlowBbFollow, PDBGFFLOWBB phFlowBbTarget)
1854	{
1855	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1856	AssertPtrReturn(pFlowBb, VERR_INVALID_POINTER);
1857
1858	if ( phFlowBbFollow
1859	&& ( pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_UNCOND
1860	\|\| pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_COND))
1861	{
1862	DBGFADDRESS AddrStart = pFlowBb->AddrEnd;
1863	DBGFR3AddrAdd(&AddrStart, 1);
1864	int rc = DBGFR3FlowQueryBbByAddress(pFlowBb->pFlow, &AddrStart, phFlowBbFollow);
1865	AssertRC(rc);
1866	}
1867
1868	if ( phFlowBbTarget
1869	&& ( pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_UNCOND_JMP
1870	\|\| pFlowBb->enmEndType == DBGFFLOWBBENDTYPE_COND))
1871	{
1872	int rc = DBGFR3FlowQueryBbByAddress(pFlowBb->pFlow, &pFlowBb->AddrTarget, phFlowBbTarget);
1873	AssertRC(rc);
1874	}
1875
1876	return VINF_SUCCESS;
1877	}
1878
1879
1880	/**
1881	* Returns the number of basic blocks referencing this basic block as a target.
1882	*
1883	* @returns Number of other basic blocks referencing this one.
1884	* @param hFlowBb The basic block handle.
1885	*
1886	* @note If the given basic block references itself (loop, etc.) this will be counted as well.
1887	*/
1888	VMMR3DECL(uint32_t) DBGFR3FlowBbGetRefBbCount(DBGFFLOWBB hFlowBb)
1889	{
1890	PDBGFFLOWBBINT pFlowBb = hFlowBb;
1891	AssertPtrReturn(pFlowBb, 0);
1892
1893	uint32_t cRefsBb = 0;
1894	PDBGFFLOWBBINT pFlowBbCur;
1895	RTListForEach(&pFlowBb->pFlow->LstFlowBb, pFlowBbCur, DBGFFLOWBBINT, NdFlowBb)
1896	{
1897	if (pFlowBbCur->fFlags & DBGF_FLOW_BB_F_INCOMPLETE_ERR)
1898	continue;
1899
1900	if ( pFlowBbCur->enmEndType == DBGFFLOWBBENDTYPE_UNCOND
1901	\|\| pFlowBbCur->enmEndType == DBGFFLOWBBENDTYPE_COND)
1902	{
1903	DBGFADDRESS AddrStart = pFlowBb->AddrEnd;
1904	DBGFR3AddrAdd(&AddrStart, 1);
1905	if (dbgfR3FlowAddrEqual(&pFlowBbCur->AddrStart, &AddrStart))
1906	cRefsBb++;
1907	}
1908
1909	if ( ( pFlowBbCur->enmEndType == DBGFFLOWBBENDTYPE_UNCOND_JMP
1910	\|\| pFlowBbCur->enmEndType == DBGFFLOWBBENDTYPE_COND)
1911	&& dbgfR3FlowAddrEqual(&pFlowBbCur->AddrStart, &pFlowBb->AddrTarget))
1912	cRefsBb++;
1913	}
1914	return cRefsBb;
1915	}
1916
1917
1918	/**
1919	* Returns the basic block handles referencing the given basic block.
1920	*
1921	* @returns VBox status code.
1922	* @retval VERR_BUFFER_OVERFLOW if the array can't hold all the basic blocks.
1923	* @param hFlowBb The basic block handle.
1924	* @param paFlowBbRef Pointer to the array containing the referencing basic block handles on success.
1925	* @param cRef Number of entries in the given array.
1926	*/
1927	VMMR3DECL(int) DBGFR3FlowBbGetRefBb(DBGFFLOWBB hFlowBb, PDBGFFLOWBB paFlowBbRef, uint32_t cRef)
1928	{
1929	RT_NOREF3(hFlowBb, paFlowBbRef, cRef);
1930	return VERR_NOT_IMPLEMENTED;
1931	}
1932
1933
1934	/**
1935	* Retains a reference for the given control flow graph branch table.
1936	*
1937	* @returns new reference count.
1938	* @param hFlowBranchTbl The branch table handle.
1939	*/
1940	VMMR3DECL(uint32_t) DBGFR3FlowBranchTblRetain(DBGFFLOWBRANCHTBL hFlowBranchTbl)
1941	{
1942	PDBGFFLOWBRANCHTBLINT pFlowBranchTbl = hFlowBranchTbl;
1943	AssertPtrReturn(pFlowBranchTbl, UINT32_MAX);
1944
1945	uint32_t cRefs = ASMAtomicIncU32(&pFlowBranchTbl->cRefs);
1946	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pFlowBranchTbl));
1947	return cRefs;
1948	}
1949
1950
1951	/**
1952	* Releases a given branch table handle.
1953	*
1954	* @returns the new reference count of the given branch table, on 0 it is destroyed.
1955	* @param hFlowBranchTbl The branch table handle.
1956	*/
1957	VMMR3DECL(uint32_t) DBGFR3FlowBranchTblRelease(DBGFFLOWBRANCHTBL hFlowBranchTbl)
1958	{
1959	PDBGFFLOWBRANCHTBLINT pFlowBranchTbl = hFlowBranchTbl;
1960	if (!pFlowBranchTbl)
1961	return 0;
1962	AssertPtrReturn(pFlowBranchTbl, UINT32_MAX);
1963
1964	uint32_t cRefs = ASMAtomicDecU32(&pFlowBranchTbl->cRefs);
1965	AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pFlowBranchTbl));
1966	if (cRefs == 0)
1967	dbgfR3FlowBranchTblDestroy(pFlowBranchTbl);
1968	return cRefs;
1969	}
1970
1971
1972	/**
1973	* Return the number of slots the branch table has.
1974	*
1975	* @returns Number of slots in the branch table.
1976	* @param hFlowBranchTbl The branch table handle.
1977	*/
1978	VMMR3DECL(uint32_t) DBGFR3FlowBranchTblGetSlots(DBGFFLOWBRANCHTBL hFlowBranchTbl)
1979	{
1980	PDBGFFLOWBRANCHTBLINT pFlowBranchTbl = hFlowBranchTbl;
1981	AssertPtrReturn(pFlowBranchTbl, 0);
1982
1983	return pFlowBranchTbl->cSlots;
1984	}
1985
1986
1987	/**
1988	* Returns the start address of the branch table in the guest.
1989	*
1990	* @returns Pointer to start address of the branch table (pAddrStart).
1991	* @param hFlowBranchTbl The branch table handle.
1992	* @param pAddrStart Where to store the branch table address.
1993	*/
1994	VMMR3DECL(PDBGFADDRESS) DBGFR3FlowBranchTblGetStartAddress(DBGFFLOWBRANCHTBL hFlowBranchTbl, PDBGFADDRESS pAddrStart)
1995	{
1996	PDBGFFLOWBRANCHTBLINT pFlowBranchTbl = hFlowBranchTbl;
1997	AssertPtrReturn(pFlowBranchTbl, NULL);
1998	AssertPtrReturn(pAddrStart, NULL);
1999
2000	*pAddrStart = pFlowBranchTbl->AddrStart;
2001	return pAddrStart;
2002	}
2003
2004
2005	/**
2006	* Returns one address in the branch table at the given slot index.
2007	*
2008	* @return Pointer to the address at the given slot in the given branch table.
2009	* @param hFlowBranchTbl The branch table handle.
2010	* @param idxSlot The slot the address should be returned from.
2011	* @param pAddrSlot Where to store the address.
2012	*/
2013	VMMR3DECL(PDBGFADDRESS) DBGFR3FlowBranchTblGetAddrAtSlot(DBGFFLOWBRANCHTBL hFlowBranchTbl, uint32_t idxSlot, PDBGFADDRESS pAddrSlot)
2014	{
2015	PDBGFFLOWBRANCHTBLINT pFlowBranchTbl = hFlowBranchTbl;
2016	AssertPtrReturn(pFlowBranchTbl, NULL);
2017	AssertPtrReturn(pAddrSlot, NULL);
2018	AssertReturn(idxSlot < pFlowBranchTbl->cSlots, NULL);
2019
2020	*pAddrSlot = pFlowBranchTbl->aAddresses[idxSlot];
2021	return pAddrSlot;
2022	}
2023
2024
2025	/**
2026	* Query all addresses contained in the given branch table.
2027	*
2028	* @returns VBox status code.
2029	* @retval VERR_BUFFER_OVERFLOW if there is not enough space in the array to hold all addresses.
2030	* @param hFlowBranchTbl The branch table handle.
2031	* @param paAddrs Where to store the addresses on success.
2032	* @param cAddrs Number of entries the array can hold.
2033	*/
2034	VMMR3DECL(int) DBGFR3FlowBranchTblQueryAddresses(DBGFFLOWBRANCHTBL hFlowBranchTbl, PDBGFADDRESS paAddrs, uint32_t cAddrs)
2035	{
2036	PDBGFFLOWBRANCHTBLINT pFlowBranchTbl = hFlowBranchTbl;
2037	AssertPtrReturn(pFlowBranchTbl, VERR_INVALID_HANDLE);
2038	AssertPtrReturn(paAddrs, VERR_INVALID_POINTER);
2039	AssertReturn(cAddrs > 0, VERR_INVALID_PARAMETER);
2040
2041	if (cAddrs < pFlowBranchTbl->cSlots)
2042	return VERR_BUFFER_OVERFLOW;
2043
2044	memcpy(paAddrs, &pFlowBranchTbl->aAddresses[0], pFlowBranchTbl->cSlots * sizeof(DBGFADDRESS));
2045	return VINF_SUCCESS;
2046	}
2047
2048
2049	/**
2050	* @callback_method_impl{FNRTSORTCMP}
2051	*/
2052	static DECLCALLBACK(int) dbgfR3FlowItSortCmp(void const pvElement1, void const pvElement2, void *pvUser)
2053	{
2054	PDBGFFLOWITORDER penmOrder = (PDBGFFLOWITORDER)pvUser;
2055	PDBGFFLOWBBINT pFlowBb1 = (PDBGFFLOWBBINT )pvElement1;
2056	PDBGFFLOWBBINT pFlowBb2 = (PDBGFFLOWBBINT )pvElement2;
2057
2058	if (dbgfR3FlowAddrEqual(&pFlowBb1->AddrStart, &pFlowBb2->AddrStart))
2059	return 0;
2060
2061	if (*penmOrder == DBGFFLOWITORDER_BY_ADDR_LOWEST_FIRST)
2062	{
2063	if (dbgfR3FlowAddrLower(&pFlowBb1->AddrStart, &pFlowBb2->AddrStart))
2064	return -1;
2065	else
2066	return 1;
2067	}
2068	else
2069	{
2070	if (dbgfR3FlowAddrLower(&pFlowBb1->AddrStart, &pFlowBb2->AddrStart))
2071	return 1;
2072	else
2073	return -1;
2074	}
2075	}
2076
2077
2078	/**
2079	* Creates a new iterator for the given control flow graph.
2080	*
2081	* @returns VBox status code.
2082	* @param hFlow The control flow graph handle.
2083	* @param enmOrder The order in which the basic blocks are enumerated.
2084	* @param phFlowIt Where to store the handle to the iterator on success.
2085	*/
2086	VMMR3DECL(int) DBGFR3FlowItCreate(DBGFFLOW hFlow, DBGFFLOWITORDER enmOrder, PDBGFFLOWIT phFlowIt)
2087	{
2088	int rc = VINF_SUCCESS;
2089	PDBGFFLOWINT pFlow = hFlow;
2090	AssertPtrReturn(pFlow, VERR_INVALID_POINTER);
2091	AssertPtrReturn(phFlowIt, VERR_INVALID_POINTER);
2092	AssertReturn(enmOrder > DBGFFLOWITORDER_INVALID && enmOrder < DBGFFLOWITORDER_BREADTH_FIRST,
2093	VERR_INVALID_PARAMETER);
2094	AssertReturn(enmOrder < DBGFFLOWITORDER_DEPTH_FRIST, VERR_NOT_IMPLEMENTED); /** @todo */
2095
2096	PDBGFFLOWITINT pIt = (PDBGFFLOWITINT)RTMemAllocZ(RT_UOFFSETOF_DYN(DBGFFLOWITINT, apBb[pFlow->cBbs]));
2097	if (RT_LIKELY(pIt))
2098	{
2099	DBGFR3FlowRetain(hFlow);
2100	pIt->pFlow = pFlow;
2101	pIt->idxBbNext = 0;
2102	/* Fill the list and then sort. */
2103	uint32_t idxBb = 0;
2104	PDBGFFLOWBBINT pFlowBb;
2105	RTListForEach(&pFlow->LstFlowBb, pFlowBb, DBGFFLOWBBINT, NdFlowBb)
2106	{
2107	DBGFR3FlowBbRetain(pFlowBb);
2108	pIt->apBb[idxBb++] = pFlowBb;
2109	}
2110
2111	/* Sort the blocks by address. */
2112	RTSortShell(&pIt->apBb[0], pFlow->cBbs, sizeof(PDBGFFLOWBBINT), dbgfR3FlowItSortCmp, &enmOrder);
2113
2114	*phFlowIt = pIt;
2115	}
2116	else
2117	rc = VERR_NO_MEMORY;
2118
2119	return rc;
2120	}
2121
2122
2123	/**
2124	* Destroys a given control flow graph iterator.
2125	*
2126	* @returns nothing.
2127	* @param hFlowIt The control flow graph iterator handle.
2128	*/
2129	VMMR3DECL(void) DBGFR3FlowItDestroy(DBGFFLOWIT hFlowIt)
2130	{
2131	PDBGFFLOWITINT pIt = hFlowIt;
2132	AssertPtrReturnVoid(pIt);
2133
2134	for (unsigned i = 0; i < pIt->pFlow->cBbs; i++)
2135	DBGFR3FlowBbRelease(pIt->apBb[i]);
2136
2137	DBGFR3FlowRelease(pIt->pFlow);
2138	RTMemFree(pIt);
2139	}
2140
2141
2142	/**
2143	* Returns the next basic block in the iterator or NULL if there is no
2144	* basic block left.
2145	*
2146	* @returns Handle to the next basic block in the iterator or NULL if the end
2147	* was reached.
2148	* @param hFlowIt The iterator handle.
2149	*
2150	* @note If a valid handle is returned it must be release with DBGFR3FlowBbRelease()
2151	* when not required anymore.
2152	*/
2153	VMMR3DECL(DBGFFLOWBB) DBGFR3FlowItNext(DBGFFLOWIT hFlowIt)
2154	{
2155	PDBGFFLOWITINT pIt = hFlowIt;
2156	AssertPtrReturn(pIt, NULL);
2157
2158	PDBGFFLOWBBINT pFlowBb = NULL;
2159	if (pIt->idxBbNext < pIt->pFlow->cBbs)
2160	{
2161	pFlowBb = pIt->apBb[pIt->idxBbNext++];
2162	DBGFR3FlowBbRetain(pFlowBb);
2163	}
2164
2165	return pFlowBb;
2166	}
2167
2168
2169	/**
2170	* Resets the given iterator to the beginning.
2171	*
2172	* @returns VBox status code.
2173	* @param hFlowIt The iterator handle.
2174	*/
2175	VMMR3DECL(int) DBGFR3FlowItReset(DBGFFLOWIT hFlowIt)
2176	{
2177	PDBGFFLOWITINT pIt = hFlowIt;
2178	AssertPtrReturn(pIt, VERR_INVALID_HANDLE);
2179
2180	pIt->idxBbNext = 0;
2181	return VINF_SUCCESS;
2182	}
2183
2184
2185	/**
2186	* @callback_method_impl{FNRTSORTCMP}
2187	*/
2188	static DECLCALLBACK(int) dbgfR3FlowBranchTblItSortCmp(void const pvElement1, void const pvElement2, void *pvUser)
2189	{
2190	PDBGFFLOWITORDER penmOrder = (PDBGFFLOWITORDER)pvUser;
2191	PDBGFFLOWBRANCHTBLINT pTbl1 = (PDBGFFLOWBRANCHTBLINT )pvElement1;
2192	PDBGFFLOWBRANCHTBLINT pTbl2 = (PDBGFFLOWBRANCHTBLINT )pvElement2;
2193
2194	if (dbgfR3FlowAddrEqual(&pTbl1->AddrStart, &pTbl2->AddrStart))
2195	return 0;
2196
2197	if (*penmOrder == DBGFFLOWITORDER_BY_ADDR_LOWEST_FIRST)
2198	{
2199	if (dbgfR3FlowAddrLower(&pTbl1->AddrStart, &pTbl2->AddrStart))
2200	return -1;
2201	else
2202	return 1;
2203	}
2204	else
2205	{
2206	if (dbgfR3FlowAddrLower(&pTbl1->AddrStart, &pTbl2->AddrStart))
2207	return 1;
2208	else
2209	return -1;
2210	}
2211	}
2212
2213
2214	/**
2215	* Creates a new branch table iterator for the given control flow graph.
2216	*
2217	* @returns VBox status code.
2218	* @param hFlow The control flow graph handle.
2219	* @param enmOrder The order in which the basic blocks are enumerated.
2220	* @param phFlowBranchTblIt Where to store the handle to the iterator on success.
2221	*/
2222	VMMR3DECL(int) DBGFR3FlowBranchTblItCreate(DBGFFLOW hFlow, DBGFFLOWITORDER enmOrder,
2223	PDBGFFLOWBRANCHTBLIT phFlowBranchTblIt)
2224	{
2225	int rc = VINF_SUCCESS;
2226	PDBGFFLOWINT pFlow = hFlow;
2227	AssertPtrReturn(pFlow, VERR_INVALID_POINTER);
2228	AssertPtrReturn(phFlowBranchTblIt, VERR_INVALID_POINTER);
2229	AssertReturn(enmOrder > DBGFFLOWITORDER_INVALID && enmOrder < DBGFFLOWITORDER_BREADTH_FIRST,
2230	VERR_INVALID_PARAMETER);
2231	AssertReturn(enmOrder < DBGFFLOWITORDER_DEPTH_FRIST, VERR_NOT_SUPPORTED);
2232
2233	PDBGFFLOWBRANCHTBLITINT pIt = (PDBGFFLOWBRANCHTBLITINT)RTMemAllocZ(RT_UOFFSETOF_DYN(DBGFFLOWBRANCHTBLITINT,
2234	apBranchTbl[pFlow->cBranchTbls]));
2235	if (RT_LIKELY(pIt))
2236	{
2237	DBGFR3FlowRetain(hFlow);
2238	pIt->pFlow = pFlow;
2239	pIt->idxTblNext = 0;
2240	/* Fill the list and then sort. */
2241	uint32_t idxTbl = 0;
2242	PDBGFFLOWBRANCHTBLINT pFlowBranchTbl;
2243	RTListForEach(&pFlow->LstBranchTbl, pFlowBranchTbl, DBGFFLOWBRANCHTBLINT, NdBranchTbl)
2244	{
2245	DBGFR3FlowBranchTblRetain(pFlowBranchTbl);
2246	pIt->apBranchTbl[idxTbl++] = pFlowBranchTbl;
2247	}
2248
2249	/* Sort the blocks by address. */
2250	RTSortShell(&pIt->apBranchTbl[0], pFlow->cBranchTbls, sizeof(PDBGFFLOWBRANCHTBLINT), dbgfR3FlowBranchTblItSortCmp, &enmOrder);
2251
2252	*phFlowBranchTblIt = pIt;
2253	}
2254	else
2255	rc = VERR_NO_MEMORY;
2256
2257	return rc;
2258	}
2259
2260
2261	/**
2262	* Destroys a given control flow graph branch table iterator.
2263	*
2264	* @returns nothing.
2265	* @param hFlowBranchTblIt The control flow graph branch table iterator handle.
2266	*/
2267	VMMR3DECL(void) DBGFR3FlowBranchTblItDestroy(DBGFFLOWBRANCHTBLIT hFlowBranchTblIt)
2268	{
2269	PDBGFFLOWBRANCHTBLITINT pIt = hFlowBranchTblIt;
2270	AssertPtrReturnVoid(pIt);
2271
2272	for (unsigned i = 0; i < pIt->pFlow->cBranchTbls; i++)
2273	DBGFR3FlowBranchTblRelease(pIt->apBranchTbl[i]);
2274
2275	DBGFR3FlowRelease(pIt->pFlow);
2276	RTMemFree(pIt);
2277	}
2278
2279
2280	/**
2281	* Returns the next branch table in the iterator or NULL if there is no
2282	* branch table left.
2283	*
2284	* @returns Handle to the next basic block in the iterator or NULL if the end
2285	* was reached.
2286	* @param hFlowBranchTblIt The iterator handle.
2287	*
2288	* @note If a valid handle is returned it must be release with DBGFR3FlowBranchTblRelease()
2289	* when not required anymore.
2290	*/
2291	VMMR3DECL(DBGFFLOWBRANCHTBL) DBGFR3FlowBranchTblItNext(DBGFFLOWBRANCHTBLIT hFlowBranchTblIt)
2292	{
2293	PDBGFFLOWBRANCHTBLITINT pIt = hFlowBranchTblIt;
2294	AssertPtrReturn(pIt, NULL);
2295
2296	PDBGFFLOWBRANCHTBLINT pTbl = NULL;
2297	if (pIt->idxTblNext < pIt->pFlow->cBranchTbls)
2298	{
2299	pTbl = pIt->apBranchTbl[pIt->idxTblNext++];
2300	DBGFR3FlowBranchTblRetain(pTbl);
2301	}
2302
2303	return pTbl;
2304	}
2305
2306
2307	/**
2308	* Resets the given iterator to the beginning.
2309	*
2310	* @returns VBox status code.
2311	* @param hFlowBranchTblIt The iterator handle.
2312	*/
2313	VMMR3DECL(int) DBGFR3FlowBranchTblItReset(DBGFFLOWBRANCHTBLIT hFlowBranchTblIt)
2314	{
2315	PDBGFFLOWBRANCHTBLITINT pIt = hFlowBranchTblIt;
2316	AssertPtrReturn(pIt, VERR_INVALID_HANDLE);
2317
2318	pIt->idxTblNext = 0;
2319	return VINF_SUCCESS;
2320	}

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source: vbox/trunk/src/VBox/VMM/VMMR3/DBGFR3Flow.cpp@ 95843

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