tstDisasm-2.cpp@ 41781

Last change on this file since 41781 was 41781, checked in by vboxsync, 13 years ago
DIS: Prefetch instruction bytes before starting to disassemble, inline all fetchers. Poison the state a bit in strict builds.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 20.9 KB

Line
1	/* $Id: tstDisasm-2.cpp 41781 2012-06-16 19:02:30Z vboxsync $ */
2	/** @file
3	* Testcase - Generic Disassembler Tool.
4	*/
5
6	/*
7	* Copyright (C) 2008 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	* Header Files *
20	*******************************************************************************/
21	#include <VBox/dis.h>
22	#include <VBox/err.h>
23	#include <iprt/alloc.h>
24	#include <iprt/assert.h>
25	#include <iprt/initterm.h>
26	#include <iprt/getopt.h>
27	#include <iprt/file.h>
28	#include <iprt/path.h>
29	#include <iprt/stream.h>
30	#include <iprt/string.h>
31	#include <iprt/ctype.h>
32
33
34	/*******************************************************************************
35	* Structures and Typedefs *
36	*******************************************************************************/
37	typedef enum { kAsmStyle_Default, kAsmStyle_yasm, kAsmStyle_masm, kAsmStyle_gas, kAsmStyle_invalid } ASMSTYLE;
38	typedef enum { kUndefOp_Fail, kUndefOp_All, kUndefOp_DefineByte, kUndefOp_End } UNDEFOPHANDLING;
39
40	typedef struct MYDISSTATE
41	{
42	DISCPUSTATE Cpu;
43	uint64_t uAddress; /*< The current instruction address. /
44	uint8_t pbInstr; /< The current instruction (pointer). /
45	uint32_t cbInstr; /*< The size of the current instruction. /
46	bool fUndefOp; /*< Whether the current instruction is really an undefined opcode./
47	UNDEFOPHANDLING enmUndefOp; /*< How to treat undefined opcodes. /
48	int rc; /*< Set if we hit EOF. /
49	size_t cbLeft; /*< The number of bytes left. (read) /
50	uint8_t pbNext; /< The next byte. (read) /
51	uint64_t uNextAddr; /*< The address of the next byte. (read) /
52	char szLine[256]; /*< The disassembler text output. /
53	} MYDISSTATE;
54	typedef MYDISSTATE *PMYDISSTATE;
55
56
57
58	/**
59	* Default style.
60	*
61	* @param pState The disassembler state.
62	*/
63	static void MyDisasDefaultFormatter(PMYDISSTATE pState)
64	{
65	RTPrintf("%s", pState->szLine);
66	}
67
68
69	/**
70	* Yasm style.
71	*
72	* @param pState The disassembler state.
73	*/
74	static void MyDisasYasmFormatter(PMYDISSTATE pState)
75	{
76	char szTmp[256];
77	#if 0
78	/* a very quick hack. */
79	strcpy(szTmp, RTStrStripL(strchr(pState->szLine, ':') + 1));
80
81	char *psz = strrchr(szTmp, '[');
82	*psz = '\0';
83	RTStrStripR(szTmp);
84
85	psz = strstr(szTmp, " ptr ");
86	if (psz)
87	memset(psz, ' ', 5);
88
89	char *pszEnd = strchr(szTmp, '\0');
90	while (pszEnd - &szTmp[0] < 71)
91	*pszEnd++ = ' ';
92	*pszEnd = '\0';
93
94	#else
95	size_t cch = DISFormatYasmEx(&pState->Cpu, szTmp, sizeof(szTmp),
96	DIS_FMT_FLAGS_STRICT \| DIS_FMT_FLAGS_ADDR_RIGHT \| DIS_FMT_FLAGS_ADDR_COMMENT
97	\| DIS_FMT_FLAGS_BYTES_RIGHT \| DIS_FMT_FLAGS_BYTES_COMMENT \| DIS_FMT_FLAGS_BYTES_SPACED,
98	NULL, NULL);
99	Assert(cch < sizeof(szTmp));
100	while (cch < 71)
101	szTmp[cch++] = ' ';
102	szTmp[cch] = '\0';
103	#endif
104
105	RTPrintf(" %s ; %s", szTmp, pState->szLine);
106	}
107
108
109	/**
110	* Masm style.
111	*
112	* @param pState The disassembler state.
113	*/
114	static void MyDisasMasmFormatter(PMYDISSTATE pState)
115	{
116	RTPrintf("masm not implemented: %s", pState->szLine);
117	}
118
119
120	/**
121	* This is a temporary workaround for catching a few illegal opcodes
122	* that the disassembler is currently letting thru, just enough to make
123	* the assemblers happy.
124	*
125	* We're too close to a release to dare mess with these things now as
126	* they may consequences for performance and let alone introduce bugs.
127	*
128	* @returns true if it's valid. false if it isn't.
129	*
130	* @param pCpu The disassembler output.
131	*/
132	static bool MyDisasIsValidInstruction(DISCPUSTATE const *pCpu)
133	{
134	switch (pCpu->pCurInstr->uOpcode)
135	{
136	/* These doesn't take memory operands. */
137	case OP_MOV_CR:
138	case OP_MOV_DR:
139	case OP_MOV_TR:
140	if (pCpu->ModRM.Bits.Mod != 3)
141	return false;
142	break;
143
144	/* The 0x8f /0 variant of this instruction doesn't get its /r value verified. */
145	case OP_POP:
146	if ( pCpu->bOpCode == 0x8f
147	&& pCpu->ModRM.Bits.Reg != 0)
148	return false;
149	break;
150
151	/* The 0xc6 /0 and 0xc7 /0 variants of this instruction don't get their /r values verified. */
152	case OP_MOV:
153	if ( ( pCpu->bOpCode == 0xc6
154	\|\| pCpu->bOpCode == 0xc7)
155	&& pCpu->ModRM.Bits.Reg != 0)
156	return false;
157	break;
158
159	default:
160	break;
161	}
162
163	return true;
164	}
165
166
167	/**
168	* @interface_method_impl{FNDISREADBYTES}
169	*/
170	static DECLCALLBACK(int) MyDisasInstrRead(PDISCPUSTATE pDis, uint8_t offInstr, uint8_t cbMinRead, uint8_t cbMaxRead)
171	{
172	PMYDISSTATE pState = (PMYDISSTATE)pDis;
173	RTUINTPTR uSrcAddr = pState->Cpu.uInstrAddr + offInstr;
174	if (RT_LIKELY( pState->uNextAddr == uSrcAddr
175	&& pState->cbLeft >= cbMinRead))
176	{
177	/*
178	* Straight forward reading.
179	*/
180	//size_t cbToRead = cbMaxRead;
181	size_t cbToRead = cbMinRead;
182	memcpy(&pState->Cpu.abInstr[offInstr], pState->pbNext, cbToRead);
183	pState->Cpu.cbCachedInstr = offInstr + cbToRead;
184	pState->pbNext += cbToRead;
185	pState->cbLeft -= cbToRead;
186	pState->uNextAddr += cbToRead;
187	return VINF_SUCCESS;
188	}
189
190	if (pState->uNextAddr == uSrcAddr)
191	{
192	/*
193	* Reading too much.
194	*/
195	if (pState->cbLeft > 0)
196	{
197	memcpy(&pState->Cpu.abInstr[offInstr], pState->pbNext, pState->cbLeft);
198	offInstr += (uint8_t)pState->cbLeft;
199	cbMinRead -= (uint8_t)pState->cbLeft;
200	pState->pbNext += pState->cbLeft;
201	pState->uNextAddr += pState->cbLeft;
202	pState->cbLeft = 0;
203	}
204	memset(&pState->Cpu.abInstr[offInstr], 0xcc, cbMinRead);
205	pState->rc = VERR_EOF;
206	}
207	else
208	{
209	/*
210	* Non-sequential read, that's an error.
211	*/
212	RTStrmPrintf(g_pStdErr, "Reading before current instruction!\n");
213	memset(&pState->Cpu.abInstr[offInstr], 0x90, cbMinRead);
214	pState->rc = VERR_INTERNAL_ERROR;
215	}
216	pState->Cpu.cbCachedInstr = offInstr + cbMinRead;
217	return pState->rc;
218	}
219
220
221	/**
222	* Disassembles a block of memory.
223	*
224	* @returns VBox status code.
225	* @param argv0 Program name (for errors and warnings).
226	* @param enmCpuMode The cpu mode to disassemble in.
227	* @param uAddress The address we're starting to disassemble at.
228	* @param uHighlightAddr The address of the instruction that should be
229	* highlighted. Pass UINT64_MAX to keep quiet.
230	* @param pbFile Where to start disassemble.
231	* @param cbFile How much to disassemble.
232	* @param enmStyle The assembly output style.
233	* @param fListing Whether to print in a listing like mode.
234	* @param enmUndefOp How to deal with undefined opcodes.
235	*/
236	static int MyDisasmBlock(const char *argv0, DISCPUMODE enmCpuMode, uint64_t uAddress,
237	uint64_t uHighlightAddr, uint8_t *pbFile, size_t cbFile,
238	ASMSTYLE enmStyle, bool fListing, UNDEFOPHANDLING enmUndefOp)
239	{
240	/*
241	* Initialize the CPU context.
242	*/
243	MYDISSTATE State;
244	State.uAddress = uAddress;
245	State.pbInstr = pbFile;
246	State.cbInstr = 0;
247	State.enmUndefOp = enmUndefOp;
248	State.rc = VINF_SUCCESS;
249	State.cbLeft = cbFile;
250	State.pbNext = pbFile;
251	State.uNextAddr = uAddress;
252
253	void (*pfnFormatter)(PMYDISSTATE pState);
254	switch (enmStyle)
255	{
256	case kAsmStyle_Default:
257	pfnFormatter = MyDisasDefaultFormatter;
258	break;
259
260	case kAsmStyle_yasm:
261	RTPrintf(" BITS %d\n", enmCpuMode == DISCPUMODE_16BIT ? 16 : enmCpuMode == DISCPUMODE_32BIT ? 32 : 64);
262	pfnFormatter = MyDisasYasmFormatter;
263	break;
264
265	case kAsmStyle_masm:
266	pfnFormatter = MyDisasMasmFormatter;
267	break;
268
269	default:
270	AssertFailedReturn(VERR_INTERNAL_ERROR);
271	}
272
273	/*
274	* The loop.
275	*/
276	int rcRet = VINF_SUCCESS;
277	while (State.cbLeft > 0)
278	{
279	/*
280	* Disassemble it.
281	*/
282	State.cbInstr = 0;
283	State.cbLeft += State.pbNext - State.pbInstr;
284	State.uNextAddr = State.uAddress;
285	State.pbNext = State.pbInstr;
286
287	int rc = DISInstrToStrWithReader(State.uAddress, enmCpuMode, MyDisasInstrRead, &State,
288	&State.Cpu, &State.cbInstr, State.szLine, sizeof(State.szLine));
289	if ( RT_SUCCESS(rc)
290	\|\| ( ( rc == VERR_DIS_INVALID_OPCODE
291	\|\| rc == VERR_DIS_GEN_FAILURE)
292	&& State.enmUndefOp == kUndefOp_DefineByte))
293	{
294	State.fUndefOp = rc == VERR_DIS_INVALID_OPCODE
295	\|\| rc == VERR_DIS_GEN_FAILURE
296	\|\| State.Cpu.pCurInstr->uOpcode == OP_INVALID
297	\|\| State.Cpu.pCurInstr->uOpcode == OP_ILLUD2
298	\|\| ( State.enmUndefOp == kUndefOp_DefineByte
299	&& !MyDisasIsValidInstruction(&State.Cpu));
300	if (State.fUndefOp && State.enmUndefOp == kUndefOp_DefineByte)
301	{
302	if (!State.cbInstr)
303	{
304	State.Cpu.abInstr[0] = 0;
305	State.Cpu.pfnReadBytes(&State.Cpu, 0, 1, 1);
306	State.cbInstr = 1;
307	}
308	RTPrintf(" db");
309	for (unsigned off = 0; off < State.cbInstr; off++)
310	RTPrintf(off ? ", %03xh" : " %03xh", State.Cpu.abInstr[off]);
311	RTPrintf(" ; %s\n", State.szLine);
312	}
313	else if (!State.fUndefOp && State.enmUndefOp == kUndefOp_All)
314	{
315	RTPrintf("%s: error at %#RX64: unexpected valid instruction (op=%d)\n", argv0, State.uAddress, State.Cpu.pCurInstr->uOpcode);
316	pfnFormatter(&State);
317	rcRet = VERR_GENERAL_FAILURE;
318	}
319	else if (State.fUndefOp && State.enmUndefOp == kUndefOp_Fail)
320	{
321	RTPrintf("%s: error at %#RX64: undefined opcode (op=%d)\n", argv0, State.uAddress, State.Cpu.pCurInstr->uOpcode);
322	pfnFormatter(&State);
323	rcRet = VERR_GENERAL_FAILURE;
324	}
325	else
326	{
327	/* Use db for odd encodings that we can't make the assembler use. */
328	if ( State.enmUndefOp == kUndefOp_DefineByte
329	&& DISFormatYasmIsOddEncoding(&State.Cpu))
330	{
331	RTPrintf(" db");
332	for (unsigned off = 0; off < State.cbInstr; off++)
333	RTPrintf(off ? ", %03xh" : " %03xh", State.Cpu.abInstr[off]);
334	RTPrintf(" ; ");
335	}
336
337	pfnFormatter(&State);
338	}
339	}
340	else
341	{
342	State.cbInstr = State.pbNext - State.pbInstr;
343	if (!State.cbLeft)
344	RTPrintf("%s: error at %#RX64: read beyond the end (%Rrc)\n", argv0, State.uAddress, rc);
345	else if (State.cbInstr)
346	RTPrintf("%s: error at %#RX64: %Rrc cbInstr=%d\n", argv0, State.uAddress, rc, State.cbInstr);
347	else
348	{
349	RTPrintf("%s: error at %#RX64: %Rrc cbInstr=%d!\n", argv0, State.uAddress, rc, State.cbInstr);
350	if (rcRet == VINF_SUCCESS)
351	rcRet = rc;
352	break;
353	}
354	}
355
356	/* Highlight this instruction? */
357	if (uHighlightAddr - State.uAddress < State.cbInstr)
358	RTPrintf("; ^^^^^^^^^^^^^^^^^^^^^\n");
359
360	/* next */
361	State.uAddress += State.cbInstr;
362	State.pbInstr += State.cbInstr;
363	}
364
365	return rcRet;
366	}
367
368	/**
369	* Converts a hex char to a number.
370	*
371	* @returns 0..15 on success, -1 on failure.
372	* @param ch The character.
373	*/
374	static int HexDigitToNum(char ch)
375	{
376	switch (ch)
377	{
378	case '0': return 0;
379	case '1': return 1;
380	case '2': return 2;
381	case '3': return 3;
382	case '4': return 4;
383	case '5': return 5;
384	case '6': return 6;
385	case '7': return 7;
386	case '8': return 8;
387	case '9': return 9;
388	case 'A':
389	case 'a': return 0xa;
390	case 'B':
391	case 'b': return 0xb;
392	case 'C':
393	case 'c': return 0xc;
394	case 'D':
395	case 'd': return 0xd;
396	case 'E':
397	case 'e': return 0xe;
398	case 'F':
399	case 'f': return 0xf;
400	default:
401	RTPrintf("error: Invalid hex digig '%c'\n", ch);
402	return -1;
403	}
404	}
405
406	/**
407	* Prints usage info.
408	*
409	* @returns 1.
410	* @param argv0 The program name.
411	*/
412	static int Usage(const char *argv0)
413	{
414	RTStrmPrintf(g_pStdErr,
415	"usage: %s [options] <file1> [file2..fileN]\n"
416	" or: %s [options] <-x\|--hex-bytes> <hex byte> [more hex..]\n"
417	" or: %s <--help\|-h>\n"
418	"\n"
419	"Options:\n"
420	" --address\|-a <address>\n"
421	" The base address. Default: 0\n"
422	" --max-bytes\|-b <bytes>\n"
423	" The maximum number of bytes to disassemble. Default: 1GB\n"
424	" --cpumode\|-c <16\|32\|64>\n"
425	" The cpu mode. Default: 32\n"
426	" --listing\|-l, --no-listing\|-L\n"
427	" Enables or disables listing mode. Default: --no-listing\n"
428	" --offset\|-o <offset>\n"
429	" The file offset at which to start disassembling. Default: 0\n"
430	" --style\|-s <default\|yasm\|masm>\n"
431	" The assembly output style. Default: default\n"
432	" --undef-op\|-u <fail\|all\|db>\n"
433	" How to treat undefined opcodes. Default: fail\n"
434	, argv0, argv0);
435	return 1;
436	}
437
438
439	int main(int argc, char **argv)
440	{
441	RTR3InitExe(argc, &argv, 0);
442	const char * const argv0 = RTPathFilename(argv[0]);
443
444	/* options */
445	uint64_t uAddress = 0;
446	uint64_t uHighlightAddr = UINT64_MAX;
447	ASMSTYLE enmStyle = kAsmStyle_Default;
448	UNDEFOPHANDLING enmUndefOp = kUndefOp_Fail;
449	bool fListing = true;
450	DISCPUMODE enmCpuMode = DISCPUMODE_32BIT;
451	RTFOFF off = 0;
452	RTFOFF cbMax = _1G;
453	bool fHexBytes = false;
454
455	/*
456	* Parse arguments.
457	*/
458	static const RTGETOPTDEF g_aOptions[] =
459	{
460	{ "--address", 'a', RTGETOPT_REQ_UINT64 },
461	{ "--cpumode", 'c', RTGETOPT_REQ_UINT32 },
462	{ "--bytes", 'b', RTGETOPT_REQ_INT64 },
463	{ "--listing", 'l', RTGETOPT_REQ_NOTHING },
464	{ "--no-listing", 'L', RTGETOPT_REQ_NOTHING },
465	{ "--offset", 'o', RTGETOPT_REQ_INT64 },
466	{ "--style", 's', RTGETOPT_REQ_STRING },
467	{ "--undef-op", 'u', RTGETOPT_REQ_STRING },
468	{ "--hex-bytes", 'x', RTGETOPT_REQ_NOTHING },
469	};
470
471	int ch;
472	RTGETOPTUNION ValueUnion;
473	RTGETOPTSTATE GetState;
474	RTGetOptInit(&GetState, argc, argv, g_aOptions, RT_ELEMENTS(g_aOptions), 1, RTGETOPTINIT_FLAGS_OPTS_FIRST);
475	while ( (ch = RTGetOpt(&GetState, &ValueUnion))
476	&& ch != VINF_GETOPT_NOT_OPTION)
477	{
478	switch (ch)
479	{
480	case 'a':
481	uAddress = ValueUnion.u64;
482	break;
483
484	case 'b':
485	cbMax = ValueUnion.i64;
486	break;
487
488	case 'c':
489	if (ValueUnion.u32 == 16)
490	enmCpuMode = DISCPUMODE_16BIT;
491	else if (ValueUnion.u32 == 32)
492	enmCpuMode = DISCPUMODE_32BIT;
493	else if (ValueUnion.u32 == 64)
494	enmCpuMode = DISCPUMODE_64BIT;
495	else
496	{
497	RTStrmPrintf(g_pStdErr, "%s: Invalid CPU mode value %RU32\n", argv0, ValueUnion.u32);
498	return 1;
499	}
500	break;
501
502	case 'h':
503	return Usage(argv0);
504
505	case 'l':
506	fListing = true;
507	break;
508
509	case 'L':
510	fListing = false;
511	break;
512
513	case 'o':
514	off = ValueUnion.i64;
515	break;
516
517	case 's':
518	if (!strcmp(ValueUnion.psz, "default"))
519	enmStyle = kAsmStyle_Default;
520	else if (!strcmp(ValueUnion.psz, "yasm"))
521	enmStyle = kAsmStyle_yasm;
522	else if (!strcmp(ValueUnion.psz, "masm"))
523	{
524	enmStyle = kAsmStyle_masm;
525	RTStrmPrintf(g_pStdErr, "%s: masm style isn't implemented yet\n", argv0);
526	return 1;
527	}
528	else
529	{
530	RTStrmPrintf(g_pStdErr, "%s: unknown assembly style: %s\n", argv0, ValueUnion.psz);
531	return 1;
532	}
533	break;
534
535	case 'u':
536	if (!strcmp(ValueUnion.psz, "fail"))
537	enmUndefOp = kUndefOp_Fail;
538	else if (!strcmp(ValueUnion.psz, "all"))
539	enmUndefOp = kUndefOp_All;
540	else if (!strcmp(ValueUnion.psz, "db"))
541	enmUndefOp = kUndefOp_DefineByte;
542	else
543	{
544	RTStrmPrintf(g_pStdErr, "%s: unknown undefined opcode handling method: %s\n", argv0, ValueUnion.psz);
545	return 1;
546	}
547	break;
548
549	case 'x':
550	fHexBytes = true;
551	break;
552
553	case 'V':
554	RTPrintf("$Revision: $\n");
555	return 0;
556
557	default:
558	return RTGetOptPrintError(ch, &ValueUnion);
559	}
560	}
561	int iArg = GetState.iNext - 1; /** @todo Not pretty, add RTGetOptInit flag for this. */
562	if (iArg >= argc)
563	return Usage(argv0);
564
565	int rc = VINF_SUCCESS;
566	if (fHexBytes)
567	{
568	/*
569	* Convert the remaining arguments from a hex byte string into
570	* a buffer that we disassemble.
571	*/
572	size_t cb = 0;
573	uint8_t *pb = NULL;
574	for ( ; iArg < argc; iArg++)
575	{
576	char ch2;
577	const char *psz = argv[iArg];
578	while (*psz)
579	{
580	/** @todo this stuff belongs in IPRT, same stuff as mac address reading. Could be reused for IPv6 with a different item size.*/
581	/* skip white space, and for the benefit of linux panics '<' and '>'. */
582	while (RT_C_IS_SPACE(ch2 = *psz) \|\| ch2 == '<' \|\| ch2 == '>')
583	{
584	if (ch2 == '<')
585	uHighlightAddr = uAddress + cb;
586	psz++;
587	}
588	if (!ch2)
589	break;
590
591	/* one digit followed by a space or EOS, or two digits. */
592	int iNum = HexDigitToNum(*psz++);
593	if (iNum == -1)
594	return 1;
595	if (!RT_C_IS_SPACE(ch2 = *psz) && ch2 != '\0' && ch2 != '>')
596	{
597	int iDigit = HexDigitToNum(*psz++);
598	if (iDigit == -1)
599	return 1;
600	iNum = iNum * 16 + iDigit;
601	}
602
603	/* add the byte */
604	if (!(cb % 4 /64/))
605	{
606	pb = (uint8_t *)RTMemRealloc(pb, cb + 64);
607	if (!pb)
608	{
609	RTPrintf("%s: error: RTMemRealloc failed\n", argv[0]);
610	return 1;
611	}
612	}
613	pb[cb++] = (uint8_t)iNum;
614	}
615	}
616
617	/*
618	* Disassemble it.
619	*/
620	rc = MyDisasmBlock(argv0, enmCpuMode, uAddress, uHighlightAddr, pb, cb, enmStyle, fListing, enmUndefOp);
621	}
622	else
623	{
624	/*
625	* Process the files.
626	*/
627	for ( ; iArg < argc; iArg++)
628	{
629	/*
630	* Read the file into memory.
631	*/
632	void *pvFile;
633	size_t cbFile;
634	rc = RTFileReadAllEx(argv[iArg], off, cbMax, RTFILE_RDALL_O_DENY_NONE, &pvFile, &cbFile);
635	if (RT_FAILURE(rc))
636	{
637	RTStrmPrintf(g_pStdErr, "%s: %s: %Rrc\n", argv0, argv[iArg], rc);
638	break;
639	}
640
641	/*
642	* Disassemble it.
643	*/
644	rc = MyDisasmBlock(argv0, enmCpuMode, uAddress, uHighlightAddr, (uint8_t *)pvFile, cbFile, enmStyle, fListing, enmUndefOp);
645	if (RT_FAILURE(rc))
646	break;
647	}
648	}
649
650	return RT_SUCCESS(rc) ? 0 : 1;
651	}
652

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source: vbox/trunk/src/VBox/Disassembler/testcase/tstDisasm-2.cpp@ 41781

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