DBGCEval.cpp@ 61571

Last change on this file since 61571 was 59229, checked in by vboxsync, 9 years ago
DBGC,Main: Global and per-VM debugger console init script support.
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1	/* $Id: DBGCEval.cpp 59229 2015-12-29 14:55:16Z vboxsync $ */
2	/** @file
3	* DBGC - Debugger Console, command evaluator.
4	*/
5
6	/*
7	* Copyright (C) 2006-2015 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	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_DBGC
23	#include <VBox/dbg.h>
24	#include <VBox/err.h>
25	#include <VBox/log.h>
26
27	#include <iprt/asm.h>
28	#include <iprt/assert.h>
29	#include <iprt/mem.h>
30	#include <iprt/string.h>
31	#include <iprt/ctype.h>
32
33	#include <stdio.h>
34
35	#include "DBGCInternal.h"
36
37	/** Rewrite in progress. */
38	#define BETTER_ARGUMENT_MATCHING
39
40
41	/*********************************************************************************************************************************
42	* Global Variables *
43	*********************************************************************************************************************************/
44	/** Bitmap where set bits indicates the characters the may start an operator name. */
45	static uint32_t g_bmOperatorChars[256 / (4*8)];
46
47
48	/*********************************************************************************************************************************
49	* Internal Functions *
50	*********************************************************************************************************************************/
51	static int dbgcCheckAndTypePromoteArgument(PDBGC pDbgc, DBGCVARCAT enmCategory, PDBGCVAR pArg);
52	static int dbgcProcessArguments(PDBGC pDbgc, const char *pszCmdOrFunc,
53	uint32_t const cArgsMin, uint32_t const cArgsMax,
54	PCDBGCVARDESC const paVarDescs, uint32_t const cVarDescs,
55	char pszArgs, unsigned piArg, unsigned *pcArgs);
56
57
58
59	/**
60	* Initializes g_bmOperatorChars.
61	*/
62	void dbgcEvalInit(void)
63	{
64	memset(g_bmOperatorChars, 0, sizeof(g_bmOperatorChars));
65	for (unsigned iOp = 0; iOp < g_cDbgcOps; iOp++)
66	ASMBitSet(&g_bmOperatorChars[0], (uint8_t)g_aDbgcOps[iOp].szName[0]);
67	}
68
69
70	/**
71	* Checks whether the character may be the start of an operator.
72	*
73	* @returns true/false.
74	* @param ch The character.
75	*/
76	DECLINLINE(bool) dbgcIsOpChar(char ch)
77	{
78	return ASMBitTest(&g_bmOperatorChars[0], (uint8_t)ch);
79	}
80
81
82	/**
83	* Returns the amount of free scratch space.
84	*
85	* @returns Number of unallocated bytes.
86	* @param pDbgc The DBGC instance.
87	*/
88	size_t dbgcGetFreeScratchSpace(PDBGC pDbgc)
89	{
90	return sizeof(pDbgc->achScratch) - (pDbgc->pszScratch - &pDbgc->achScratch[0]);
91	}
92
93
94	/**
95	* Allocates a string from the scratch space.
96	*
97	* @returns Pointer to the allocated string buffer, NULL if out of space.
98	* @param pDbgc The DBGC instance.
99	* @param cbRequested The number of bytes to allocate.
100	*/
101	char *dbgcAllocStringScatch(PDBGC pDbgc, size_t cbRequested)
102	{
103	if (cbRequested > dbgcGetFreeScratchSpace(pDbgc))
104	return NULL;
105	char *psz = pDbgc->pszScratch;
106	pDbgc->pszScratch += cbRequested;
107	return psz;
108	}
109
110
111	/**
112	* Evals an expression into a string or symbol (single quotes).
113	*
114	* The string memory is allocated from the scratch buffer.
115	*
116	* @returns VBox status code.
117	* @param pDbgc The DBGC instance.
118	* @param pachExpr The string/symbol expression.
119	* @param cchExpr The length of the expression.
120	* @param pArg Where to return the string.
121	*/
122	static int dbgcEvalSubString(PDBGC pDbgc, const char *pachExpr, size_t cchExpr, PDBGCVAR pArg)
123	{
124	Log2(("dbgcEvalSubString: cchExpr=%d pachExpr=%.*s\n", cchExpr, cchExpr, pachExpr));
125
126	/*
127	* Allocate scratch space for the string.
128	*/
129	char *pszCopy = dbgcAllocStringScatch(pDbgc, cchExpr + 1);
130	if (!pszCopy)
131	return VERR_DBGC_PARSE_NO_SCRATCH;
132
133	/*
134	* Removing any quoting and escapings.
135	*/
136	char const chQuote = *pachExpr;
137	if (chQuote == '"' \|\| chQuote == '\'')
138	{
139	if (pachExpr[--cchExpr] != chQuote)
140	return VERR_DBGC_PARSE_UNBALANCED_QUOTE;
141
142	cchExpr--;
143	pachExpr++;
144	if (!memchr(pachExpr, chQuote, cchExpr))
145	memcpy(pszCopy, pachExpr, cchExpr);
146	else
147	{
148	size_t offSrc = 0;
149	size_t offDst = 0;
150	while (offSrc < cchExpr)
151	{
152	char const ch = pachExpr[offSrc++];
153	if (ch == chQuote)
154	{
155	if (pachExpr[offSrc] != ch)
156	return VERR_DBGC_PARSE_EXPECTED_BINARY_OP;
157	offSrc++;
158	}
159	pszCopy[offDst++] = ch;
160	}
161	}
162	}
163	else
164	memcpy(pszCopy, pachExpr, cchExpr);
165	pszCopy[cchExpr] = '\0';
166
167	/*
168	* Make the argument.
169	*/
170	pArg->pDesc = NULL;
171	pArg->pNext = NULL;
172	pArg->enmType = chQuote == '"' ? DBGCVAR_TYPE_STRING : DBGCVAR_TYPE_SYMBOL;
173	pArg->u.pszString = pszCopy;
174	pArg->enmRangeType = DBGCVAR_RANGE_BYTES;
175	pArg->u64Range = cchExpr;
176
177	NOREF(pDbgc);
178	return VINF_SUCCESS;
179	}
180
181
182	static int dbgcEvalSubNum(const char *pachExpr, size_t cchExpr, unsigned uBase, PDBGCVAR pArg)
183	{
184	Log2(("dbgcEvalSubNum: uBase=%d pachExpr=%.*s\n", uBase, cchExpr, pachExpr));
185
186	/*
187	* Empty expressions cannot be valid numbers.
188	*/
189	if (!cchExpr)
190	return VERR_DBGC_PARSE_INVALID_NUMBER;
191
192	/*
193	* Convert to number.
194	*/
195	uint64_t u64 = 0;
196	while (cchExpr-- > 0)
197	{
198	char const ch = *pachExpr;
199	uint64_t u64Prev = u64;
200	unsigned u = ch - '0';
201	if (u < 10 && u < uBase)
202	u64 = u64 * uBase + u;
203	else if (ch >= 'a' && (u = ch - ('a' - 10)) < uBase)
204	u64 = u64 * uBase + u;
205	else if (ch >= 'A' && (u = ch - ('A' - 10)) < uBase)
206	u64 = u64 * uBase + u;
207	else
208	return VERR_DBGC_PARSE_INVALID_NUMBER;
209
210	/* check for overflow - ARG!!! How to detect overflow correctly!?!?!? */
211	if (u64Prev != u64 / uBase)
212	return VERR_DBGC_PARSE_NUMBER_TOO_BIG;
213
214	/* next */
215	pachExpr++;
216	}
217
218	/*
219	* Initialize the argument.
220	*/
221	pArg->pDesc = NULL;
222	pArg->pNext = NULL;
223	pArg->enmType = DBGCVAR_TYPE_NUMBER;
224	pArg->u.u64Number = u64;
225	pArg->enmRangeType = DBGCVAR_RANGE_NONE;
226	pArg->u64Range = 0;
227
228	return VINF_SUCCESS;
229	}
230
231
232	/**
233	* dbgcEvalSubUnary worker that handles simple numeric or pointer expressions.
234	*
235	* @returns VBox status code. pResult contains the result on success.
236	* @param pDbgc Debugger console instance data.
237	* @param pszExpr The expression string.
238	* @param cchExpr The length of the expression.
239	* @param enmCategory The desired type category (for range / no range).
240	* @param pResult Where to store the result of the expression evaluation.
241	*/
242	static int dbgcEvalSubNumericOrPointer(PDBGC pDbgc, char *pszExpr, size_t cchExpr, DBGCVARCAT enmCategory,
243	PDBGCVAR pResult)
244	{
245	char const ch = pszExpr[0];
246	char const ch2 = pszExpr[1];
247
248	/* 0x<hex digits> */
249	if (ch == '0' && (ch2 == 'x' \|\| ch2 == 'X'))
250	return dbgcEvalSubNum(pszExpr + 2, cchExpr - 2, 16, pResult);
251
252	/* <hex digits>h */
253	if (RT_C_IS_XDIGIT(*pszExpr) && (pszExpr[cchExpr - 1] == 'h' \|\| pszExpr[cchExpr - 1] == 'H'))
254	{
255	pszExpr[cchExpr] = '\0';
256	return dbgcEvalSubNum(pszExpr, cchExpr - 1, 16, pResult);
257	}
258
259	/* 0i<decimal digits> */
260	if (ch == '0' && ch2 == 'i')
261	return dbgcEvalSubNum(pszExpr + 2, cchExpr - 2, 10, pResult);
262
263	/* 0t<octal digits> */
264	if (ch == '0' && ch2 == 't')
265	return dbgcEvalSubNum(pszExpr + 2, cchExpr - 2, 8, pResult);
266
267	/* 0y<binary digits> */
268	if (ch == '0' && ch2 == 'y')
269	return dbgcEvalSubNum(pszExpr + 2, cchExpr - 2, 10, pResult);
270
271	/* Hex number? */
272	unsigned off = 0;
273	while (off < cchExpr && (RT_C_IS_XDIGIT(pszExpr[off]) \|\| pszExpr[off] == '`'))
274	off++;
275	if (off == cchExpr)
276	return dbgcEvalSubNum(pszExpr, cchExpr, 16, pResult);
277
278	/*
279	* Some kind of symbol? Rejected double quoted strings, only unquoted
280	* and single quoted strings will be considered as symbols.
281	*/
282	DBGCVARTYPE enmType;
283	bool fStripRange = false;
284	switch (enmCategory)
285	{
286	case DBGCVAR_CAT_POINTER_NUMBER: enmType = DBGCVAR_TYPE_NUMBER; break;
287	case DBGCVAR_CAT_POINTER_NUMBER_NO_RANGE: enmType = DBGCVAR_TYPE_NUMBER; fStripRange = true; break;
288	case DBGCVAR_CAT_POINTER: enmType = DBGCVAR_TYPE_NUMBER; break;
289	case DBGCVAR_CAT_POINTER_NO_RANGE: enmType = DBGCVAR_TYPE_NUMBER; fStripRange = true; break;
290	case DBGCVAR_CAT_GC_POINTER: enmType = DBGCVAR_TYPE_GC_FLAT; break;
291	case DBGCVAR_CAT_GC_POINTER_NO_RANGE: enmType = DBGCVAR_TYPE_GC_FLAT; fStripRange = true; break;
292	case DBGCVAR_CAT_NUMBER: enmType = DBGCVAR_TYPE_NUMBER; break;
293	case DBGCVAR_CAT_NUMBER_NO_RANGE: enmType = DBGCVAR_TYPE_NUMBER; fStripRange = true; break;
294	default:
295	AssertFailedReturn(VERR_DBGC_PARSE_NOT_IMPLEMENTED);
296	}
297
298	char const chQuote = *pszExpr;
299	if (chQuote == '"')
300	return VERR_DBGC_PARSE_INVALID_NUMBER;
301
302	if (chQuote == '\'')
303	{
304	if (pszExpr[cchExpr - 1] != chQuote)
305	return VERR_DBGC_PARSE_UNBALANCED_QUOTE;
306	pszExpr[cchExpr - 1] = '\0';
307	pszExpr++;
308	}
309
310	int rc = dbgcSymbolGet(pDbgc, pszExpr, enmType, pResult);
311	if (RT_SUCCESS(rc))
312	{
313	if (fStripRange)
314	{
315	pResult->enmRangeType = DBGCVAR_RANGE_NONE;
316	pResult->u64Range = 0;
317	}
318	}
319	else if (rc == VERR_DBGC_PARSE_NOT_IMPLEMENTED)
320	rc = VERR_DBGC_PARSE_INVALID_NUMBER;
321	return rc;
322	}
323
324
325	/**
326	* dbgcEvalSubUnary worker that handles simple DBGCVAR_CAT_ANY expressions.
327	*
328	* @returns VBox status code. pResult contains the result on success.
329	* @param pDbgc Debugger console instance data.
330	* @param pszExpr The expression string.
331	* @param cchExpr The length of the expression.
332	* @param pResult Where to store the result of the expression evaluation.
333	*/
334	static int dbgcEvalSubUnaryAny(PDBGC pDbgc, char *pszExpr, size_t cchExpr, PDBGCVAR pResult)
335	{
336	char const ch = pszExpr[0];
337	char const ch2 = pszExpr[1];
338	unsigned off = 2;
339
340	/* 0x<hex digits> */
341	if (ch == '0' && (ch2 == 'x' \|\| ch2 == 'X'))
342	{
343	while (RT_C_IS_XDIGIT(pszExpr[off]) \|\| pszExpr[off] == '`')
344	off++;
345	if (off == cchExpr)
346	return dbgcEvalSubNum(pszExpr + 2, cchExpr - 2, 16, pResult);
347	return dbgcEvalSubString(pDbgc, pszExpr, cchExpr, pResult);
348	}
349
350	/* <hex digits>h */
351	if (RT_C_IS_XDIGIT(*pszExpr) && (pszExpr[cchExpr - 1] == 'h' \|\| pszExpr[cchExpr - 1] == 'H'))
352	{
353	cchExpr--;
354	while (off < cchExpr && (RT_C_IS_XDIGIT(pszExpr[off]) \|\| pszExpr[off] == '`'))
355	off++;
356	if (off == cchExpr)
357	{
358	pszExpr[cchExpr] = '\0';
359	return dbgcEvalSubNum(pszExpr, cchExpr, 16, pResult);
360	}
361	return dbgcEvalSubString(pDbgc, pszExpr, cchExpr + 1, pResult);
362	}
363
364	/* 0n<decimal digits> or 0i<decimal digits> */
365	if (ch == '0' && (ch2 == 'n' \|\| ch2 == 'i'))
366	{
367	while (RT_C_IS_DIGIT(pszExpr[off]) \|\| pszExpr[off] == '`')
368	off++;
369	if (off == cchExpr)
370	return dbgcEvalSubNum(pszExpr + 2, cchExpr - 2, 10, pResult);
371	return dbgcEvalSubString(pDbgc, pszExpr, cchExpr, pResult);
372	}
373
374	/* 0t<octal digits> */
375	if (ch == '0' && ch2 == 't')
376	{
377	while (RT_C_IS_ODIGIT(pszExpr[off]) \|\| pszExpr[off] == '`')
378	off++;
379	if (off == cchExpr)
380	return dbgcEvalSubNum(pszExpr + 2, cchExpr - 2, 8, pResult);
381	return dbgcEvalSubString(pDbgc, pszExpr, cchExpr, pResult);
382	}
383
384	/* 0y<binary digits> */
385	if (ch == '0' && ch2 == 'y')
386	{
387	while (pszExpr[off] == '0' \|\| pszExpr[off] == '1' \|\| pszExpr[off] == '`')
388	off++;
389	if (off == cchExpr)
390	return dbgcEvalSubNum(pszExpr + 2, cchExpr - 2, 10, pResult);
391	return dbgcEvalSubString(pDbgc, pszExpr, cchExpr, pResult);
392	}
393
394	/* Ok, no prefix of suffix. Is it a hex number after all? If not it must
395	be a string. */
396	off = 0;
397	while (RT_C_IS_XDIGIT(pszExpr[off]) \|\| pszExpr[off] == '`')
398	off++;
399	if (off == cchExpr)
400	return dbgcEvalSubNum(pszExpr, cchExpr, 16, pResult);
401	return dbgcEvalSubString(pDbgc, pszExpr, cchExpr, pResult);
402	}
403
404
405	/**
406	* Handles a call.
407	*
408	* @returns VBox status code. pResult contains the result on success.
409	* @param pDbgc The DBGC instance.
410	* @param pszFuncNm The function name.
411	* @param cchFuncNm The length of the function name.
412	* @param fExternal Whether it's an external name.
413	* @param pszArgs The start of the arguments (after parenthesis).
414	* @param cchArgs The length for the argument (exclusing
415	* parentesis).
416	* @param enmCategory The desired category of the result (ignored).
417	* @param pResult The result.
418	*/
419	static int dbgcEvalSubCall(PDBGC pDbgc, char pszFuncNm, size_t cchFuncNm, bool fExternal, char pszArgs, size_t cchArgs,
420	DBGCVARCAT enmCategory, PDBGCVAR pResult)
421	{
422	/*
423	* Lookup the function.
424	*/
425	PCDBGCFUNC pFunc = dbgcFunctionLookup(pDbgc, pszFuncNm, cchFuncNm, fExternal);
426	if (!pFunc)
427	return VERR_DBGC_PARSE_FUNCTION_NOT_FOUND;
428
429	/*
430	* Parse the arguments.
431	*/
432	unsigned cArgs;
433	unsigned iArg;
434	pszArgs[cchArgs] = '\0';
435	int rc = dbgcProcessArguments(pDbgc, pFunc->pszFuncNm,
436	pFunc->cArgsMin, pFunc->cArgsMax, pFunc->paArgDescs, pFunc->cArgDescs,
437	pszArgs, &iArg, &cArgs);
438	if (RT_SUCCESS(rc))
439	rc = pFunc->pfnHandler(pFunc, &pDbgc->CmdHlp, pDbgc->pUVM, &pDbgc->aArgs[iArg], cArgs, pResult);
440	pDbgc->iArg = iArg;
441	return rc;
442	}
443
444
445	/**
446	* Evaluates one argument with respect to unary operators.
447	*
448	* @returns VBox status code. pResult contains the result on success.
449	*
450	* @param pDbgc Debugger console instance data.
451	* @param pszExpr The expression string.
452	* @param cchExpr The length of the expression.
453	* @param enmCategory The target category for the result.
454	* @param pResult Where to store the result of the expression evaluation.
455	*/
456	static int dbgcEvalSubUnary(PDBGC pDbgc, char *pszExpr, size_t cchExpr, DBGCVARCAT enmCategory, PDBGCVAR pResult)
457	{
458	Log2(("dbgcEvalSubUnary: cchExpr=%d pszExpr=%s\n", cchExpr, pszExpr));
459
460	/*
461	* The state of the expression is now such that it will start by zero or more
462	* unary operators and being followed by an expression of some kind.
463	* The expression is either plain or in parenthesis.
464	*
465	* Being in a lazy, recursive mode today, the parsing is done as simple as possible. :-)
466	* ASSUME: unary operators are all of equal precedence.
467	*/
468	int rc = VINF_SUCCESS;
469	PCDBGCOP pOp = dbgcOperatorLookup(pDbgc, pszExpr, false, ' ');
470	if (pOp)
471	{
472	/* binary operators means syntax error. */
473	if (pOp->fBinary)
474	return VERR_DBGC_PARSE_UNEXPECTED_OPERATOR;
475
476	/*
477	* If the next expression (the one following the unary operator) is in a
478	* parenthesis a full eval is needed. If not the unary eval will suffice.
479	*/
480	/* calc and strip next expr. */
481	char *pszExpr2 = pszExpr + pOp->cchName;
482	while (RT_C_IS_BLANK(*pszExpr2))
483	pszExpr2++;
484
485	if (*pszExpr2)
486	{
487	DBGCVAR Arg;
488	if (*pszExpr2 == '(')
489	rc = dbgcEvalSub(pDbgc, pszExpr2, cchExpr - (pszExpr2 - pszExpr), pOp->enmCatArg1, &Arg);
490	else
491	rc = dbgcEvalSubUnary(pDbgc, pszExpr2, cchExpr - (pszExpr2 - pszExpr), pOp->enmCatArg1, &Arg);
492	if (RT_SUCCESS(rc))
493	rc = dbgcCheckAndTypePromoteArgument(pDbgc, pOp->enmCatArg1, &Arg);
494	if (RT_SUCCESS(rc))
495	rc = pOp->pfnHandlerUnary(pDbgc, &Arg, enmCategory, pResult);
496	}
497	else
498	rc = VERR_DBGC_PARSE_EMPTY_ARGUMENT;
499	return rc;
500	}
501
502	/*
503	* Could this be a function call?
504	*
505	* ASSUMPTIONS:
506	* - A function name only contains alphanumerical chars and it can not
507	* start with a numerical character.
508	* - Immediately following the name is a parenthesis which must cover
509	* the remaining part of the expression.
510	*/
511	bool fExternal = *pszExpr == '.';
512	char *pszFun = fExternal ? pszExpr + 1 : pszExpr;
513	char *pszFunEnd = NULL;
514	if (pszExpr[cchExpr - 1] == ')' && RT_C_IS_ALPHA(*pszFun))
515	{
516	pszFunEnd = pszExpr + 1;
517	while (pszFunEnd != '(' && RT_C_IS_ALNUM(pszFunEnd))
518	pszFunEnd++;
519	if (*pszFunEnd != '(')
520	pszFunEnd = NULL;
521	}
522	if (pszFunEnd)
523	{
524	size_t cchFunNm = pszFunEnd - pszFun;
525	return dbgcEvalSubCall(pDbgc, pszFun, cchFunNm, fExternal, pszFunEnd + 1, cchExpr - cchFunNm - fExternal - 2,
526	enmCategory, pResult);
527	}
528
529	/*
530	* Assuming plain expression.
531	* Didn't find any operators, so it must be a plain expression.
532	* Go by desired category first, then if anythings go, try guess.
533	*/
534	switch (enmCategory)
535	{
536	case DBGCVAR_CAT_ANY:
537	return dbgcEvalSubUnaryAny(pDbgc, pszExpr, cchExpr, pResult);
538
539	case DBGCVAR_CAT_POINTER_NUMBER:
540	case DBGCVAR_CAT_POINTER_NUMBER_NO_RANGE:
541	case DBGCVAR_CAT_POINTER:
542	case DBGCVAR_CAT_POINTER_NO_RANGE:
543	case DBGCVAR_CAT_GC_POINTER:
544	case DBGCVAR_CAT_GC_POINTER_NO_RANGE:
545	case DBGCVAR_CAT_NUMBER:
546	case DBGCVAR_CAT_NUMBER_NO_RANGE:
547	/* Pointers will be promoted later. */
548	return dbgcEvalSubNumericOrPointer(pDbgc, pszExpr, cchExpr, enmCategory, pResult);
549
550	case DBGCVAR_CAT_STRING:
551	case DBGCVAR_CAT_SYMBOL:
552	/* Symbols will be promoted later. */
553	return dbgcEvalSubString(pDbgc, pszExpr, cchExpr, pResult);
554
555	case DBGCVAR_CAT_OPTION:
556	case DBGCVAR_CAT_OPTION_STRING:
557	case DBGCVAR_CAT_OPTION_NUMBER:
558	return VERR_DBGC_PARSE_NOT_IMPLEMENTED;
559	}
560
561	AssertMsgFailed(("enmCategory=%d\n", enmCategory));
562	return VERR_NOT_IMPLEMENTED;
563	}
564
565
566	/**
567	* Evaluates one argument.
568	*
569	* @returns VBox status code.
570	*
571	* @param pDbgc Debugger console instance data.
572	* @param pszExpr The expression string.
573	* @param enmCategory The target category for the result.
574	* @param pResult Where to store the result of the expression evaluation.
575	*/
576	int dbgcEvalSub(PDBGC pDbgc, char *pszExpr, size_t cchExpr, DBGCVARCAT enmCategory, PDBGCVAR pResult)
577	{
578	Log2(("dbgcEvalSub: cchExpr=%d pszExpr=%s\n", cchExpr, pszExpr));
579
580	/*
581	* First we need to remove blanks in both ends.
582	* ASSUMES: There is no quoting unless the entire expression is a string.
583	*/
584
585	/* stripping. */
586	while (cchExpr > 0 && RT_C_IS_BLANK(pszExpr[cchExpr - 1]))
587	pszExpr[--cchExpr] = '\0';
588	while (RT_C_IS_BLANK(*pszExpr))
589	pszExpr++, cchExpr--;
590	if (!*pszExpr)
591	return VERR_DBGC_PARSE_EMPTY_ARGUMENT;
592
593	/*
594	* Check if there are any parenthesis which needs removing.
595	*/
596	if (pszExpr[0] == '(' && pszExpr[cchExpr - 1] == ')')
597	{
598	do
599	{
600	unsigned cPar = 1;
601	char *psz = pszExpr + 1;
602	char ch;
603	while ((ch = *psz) != '\0')
604	{
605	if (ch == '(')
606	cPar++;
607	else if (ch == ')')
608	{
609	if (cPar <= 0)
610	return VERR_DBGC_PARSE_UNBALANCED_PARENTHESIS;
611	cPar--;
612	if (cPar == 0 && psz[1]) /* If not at end, there's nothing to do. */
613	break;
614	}
615	/* next */
616	psz++;
617	}
618	if (ch)
619	break;
620
621	/* remove the parenthesis. */
622	pszExpr++;
623	cchExpr -= 2;
624	pszExpr[cchExpr] = '\0';
625
626	/* strip blanks. */
627	while (cchExpr > 0 && RT_C_IS_BLANK(pszExpr[cchExpr - 1]))
628	pszExpr[--cchExpr] = '\0';
629	while (RT_C_IS_BLANK(*pszExpr))
630	pszExpr++, cchExpr--;
631	if (!*pszExpr)
632	return VERR_DBGC_PARSE_EMPTY_ARGUMENT;
633	} while (pszExpr[0] == '(' && pszExpr[cchExpr - 1] == ')');
634	}
635
636	/*
637	* Now, we need to look for the binary operator with the lowest precedence.
638	*
639	* If there are no operators we're left with a simple expression which we
640	* evaluate with respect to unary operators
641	*/
642	char *pszOpSplit = NULL;
643	PCDBGCOP pOpSplit = NULL;
644	unsigned cBinaryOps = 0;
645	unsigned cPar = 0;
646	unsigned cchWord = 0;
647	char chQuote = '\0';
648	char chPrev = ' ';
649	bool fBinary = false;
650	char *psz = pszExpr;
651	char ch;
652
653	while ((ch = *psz) != '\0')
654	{
655	/*
656	* String quoting.
657	*/
658	if (chQuote)
659	{
660	if (ch == chQuote)
661	{
662	if (psz[1] == chQuote)
663	{
664	psz++; /* escaped quote */
665	cchWord++;
666	}
667	else
668	{
669	chQuote = '\0';
670	fBinary = true;
671	cchWord = 0;
672	}
673	}
674	else
675	cchWord++;
676	}
677	else if (ch == '"' \|\| ch == '\'')
678	{
679	if (fBinary \|\| cchWord)
680	return VERR_DBGC_PARSE_EXPECTED_BINARY_OP;
681	chQuote = ch;
682	}
683	/*
684	* Parentheses.
685	*/
686	else if (ch == '(')
687	{
688	if (!cPar && fBinary && !cchWord)
689	return VERR_DBGC_PARSE_EXPECTED_BINARY_OP;
690	cPar++;
691	fBinary = false;
692	cchWord = 0;
693	}
694	else if (ch == ')')
695	{
696	if (cPar <= 0)
697	return VERR_DBGC_PARSE_UNBALANCED_PARENTHESIS;
698	cPar--;
699	fBinary = true;
700	cchWord = 0;
701	}
702	/*
703	* Potential operator.
704	*/
705	else if (cPar == 0 && !RT_C_IS_BLANK(ch))
706	{
707	PCDBGCOP pOp = dbgcIsOpChar(ch)
708	? dbgcOperatorLookup(pDbgc, psz, fBinary, chPrev)
709	: NULL;
710	if (pOp)
711	{
712	/* If not the right kind of operator we've got a syntax error. */
713	if (pOp->fBinary != fBinary)
714	return VERR_DBGC_PARSE_UNEXPECTED_OPERATOR;
715
716	/*
717	* Update the parse state and skip the operator.
718	*/
719	if (!pOpSplit)
720	{
721	pOpSplit = pOp;
722	pszOpSplit = psz;
723	cBinaryOps = fBinary;
724	}
725	else if (fBinary)
726	{
727	cBinaryOps++;
728	if (pOp->iPrecedence >= pOpSplit->iPrecedence)
729	{
730	pOpSplit = pOp;
731	pszOpSplit = psz;
732	}
733	}
734
735	psz += pOp->cchName - 1;
736	fBinary = false;
737	cchWord = 0;
738	}
739	else if (fBinary && !cchWord)
740	return VERR_DBGC_PARSE_EXPECTED_BINARY_OP;
741	else
742	{
743	fBinary = true;
744	cchWord++;
745	}
746	}
747	else if (cPar == 0 && RT_C_IS_BLANK(ch))
748	cchWord++;
749
750	/* next */
751	psz++;
752	chPrev = ch;
753	} /* parse loop. */
754
755	if (chQuote)
756	return VERR_DBGC_PARSE_UNBALANCED_QUOTE;
757
758	/*
759	* Either we found an operator to divide the expression by or we didn't
760	* find any. In the first case it's divide and conquer. In the latter
761	* it's a single expression which needs dealing with its unary operators
762	* if any.
763	*/
764	int rc;
765	if ( cBinaryOps
766	&& pOpSplit->fBinary)
767	{
768	/* process 1st sub expression. */
769	*pszOpSplit = '\0';
770	DBGCVAR Arg1;
771	rc = dbgcEvalSub(pDbgc, pszExpr, pszOpSplit - pszExpr, pOpSplit->enmCatArg1, &Arg1);
772	if (RT_SUCCESS(rc))
773	{
774	/* process 2nd sub expression. */
775	char *psz2 = pszOpSplit + pOpSplit->cchName;
776	DBGCVAR Arg2;
777	rc = dbgcEvalSub(pDbgc, psz2, cchExpr - (psz2 - pszExpr), pOpSplit->enmCatArg2, &Arg2);
778	if (RT_SUCCESS(rc))
779	rc = dbgcCheckAndTypePromoteArgument(pDbgc, pOpSplit->enmCatArg1, &Arg1);
780	if (RT_SUCCESS(rc))
781	rc = dbgcCheckAndTypePromoteArgument(pDbgc, pOpSplit->enmCatArg2, &Arg2);
782	if (RT_SUCCESS(rc))
783	rc = pOpSplit->pfnHandlerBinary(pDbgc, &Arg1, &Arg2, pResult);
784	}
785	}
786	else if (cBinaryOps)
787	{
788	/* process sub expression. */
789	pszOpSplit += pOpSplit->cchName;
790	DBGCVAR Arg;
791	rc = dbgcEvalSub(pDbgc, pszOpSplit, cchExpr - (pszOpSplit - pszExpr), pOpSplit->enmCatArg1, &Arg);
792	if (RT_SUCCESS(rc))
793	rc = dbgcCheckAndTypePromoteArgument(pDbgc, pOpSplit->enmCatArg1, &Arg);
794	if (RT_SUCCESS(rc))
795	rc = pOpSplit->pfnHandlerUnary(pDbgc, &Arg, enmCategory, pResult);
796	}
797	else
798	/* plain expression, qutoed string, or using unary operators perhaps with parentheses. */
799	rc = dbgcEvalSubUnary(pDbgc, pszExpr, cchExpr, enmCategory, pResult);
800
801	return rc;
802	}
803
804
805	/**
806	* Worker for dbgcProcessArguments that performs type checking and promoptions.
807	*
808	* @returns VBox status code.
809	*
810	* @param pDbgc Debugger console instance data.
811	* @param enmCategory The target category for the result.
812	* @param pArg The argument to check and promote.
813	*/
814	static int dbgcCheckAndTypePromoteArgument(PDBGC pDbgc, DBGCVARCAT enmCategory, PDBGCVAR pArg)
815	{
816	switch (enmCategory)
817	{
818	/*
819	* Anything goes
820	*/
821	case DBGCVAR_CAT_ANY:
822	return VINF_SUCCESS;
823
824	/*
825	* Pointer with and without range.
826	* We can try resolve strings and symbols as symbols and promote
827	* numbers to flat GC pointers.
828	*/
829	case DBGCVAR_CAT_POINTER_NO_RANGE:
830	case DBGCVAR_CAT_POINTER_NUMBER_NO_RANGE:
831	if (pArg->enmRangeType != DBGCVAR_RANGE_NONE)
832	return VERR_DBGC_PARSE_NO_RANGE_ALLOWED;
833	/* fallthru */
834	case DBGCVAR_CAT_POINTER:
835	case DBGCVAR_CAT_POINTER_NUMBER:
836	switch (pArg->enmType)
837	{
838	case DBGCVAR_TYPE_GC_FLAT:
839	case DBGCVAR_TYPE_GC_FAR:
840	case DBGCVAR_TYPE_GC_PHYS:
841	case DBGCVAR_TYPE_HC_FLAT:
842	case DBGCVAR_TYPE_HC_PHYS:
843	return VINF_SUCCESS;
844
845	case DBGCVAR_TYPE_SYMBOL:
846	case DBGCVAR_TYPE_STRING:
847	{
848	DBGCVAR Var;
849	int rc = dbgcSymbolGet(pDbgc, pArg->u.pszString, DBGCVAR_TYPE_GC_FLAT, &Var);
850	if (RT_SUCCESS(rc))
851	{
852	/* deal with range */
853	if (pArg->enmRangeType != DBGCVAR_RANGE_NONE)
854	{
855	Var.enmRangeType = pArg->enmRangeType;
856	Var.u64Range = pArg->u64Range;
857	}
858	else if (enmCategory == DBGCVAR_CAT_POINTER_NO_RANGE)
859	Var.enmRangeType = DBGCVAR_RANGE_NONE;
860	*pArg = Var;
861	}
862	return rc;
863	}
864
865	case DBGCVAR_TYPE_NUMBER:
866	if ( enmCategory != DBGCVAR_CAT_POINTER_NUMBER
867	&& enmCategory != DBGCVAR_CAT_POINTER_NUMBER_NO_RANGE)
868	{
869	RTGCPTR GCPtr = (RTGCPTR)pArg->u.u64Number;
870	pArg->enmType = DBGCVAR_TYPE_GC_FLAT;
871	pArg->u.GCFlat = GCPtr;
872	}
873	return VINF_SUCCESS;
874
875	default:
876	AssertMsgFailedReturn(("Invalid type %d\n", pArg->enmType), VERR_DBGC_PARSE_INCORRECT_ARG_TYPE);
877	}
878	break; /* (not reached) */
879
880	/*
881	* GC pointer with and without range.
882	* We can try resolve strings and symbols as symbols and
883	* promote numbers to flat GC pointers.
884	*/
885	case DBGCVAR_CAT_GC_POINTER_NO_RANGE:
886	if (pArg->enmRangeType != DBGCVAR_RANGE_NONE)
887	return VERR_DBGC_PARSE_NO_RANGE_ALLOWED;
888	/* fallthru */
889	case DBGCVAR_CAT_GC_POINTER:
890	switch (pArg->enmType)
891	{
892	case DBGCVAR_TYPE_GC_FLAT:
893	case DBGCVAR_TYPE_GC_FAR:
894	case DBGCVAR_TYPE_GC_PHYS:
895	return VINF_SUCCESS;
896
897	case DBGCVAR_TYPE_HC_FLAT:
898	case DBGCVAR_TYPE_HC_PHYS:
899	return VERR_DBGC_PARSE_CONVERSION_FAILED;
900
901	case DBGCVAR_TYPE_SYMBOL:
902	case DBGCVAR_TYPE_STRING:
903	{
904	DBGCVAR Var;
905	int rc = dbgcSymbolGet(pDbgc, pArg->u.pszString, DBGCVAR_TYPE_GC_FLAT, &Var);
906	if (RT_SUCCESS(rc))
907	{
908	/* deal with range */
909	if (pArg->enmRangeType != DBGCVAR_RANGE_NONE)
910	{
911	Var.enmRangeType = pArg->enmRangeType;
912	Var.u64Range = pArg->u64Range;
913	}
914	else if (enmCategory == DBGCVAR_CAT_POINTER_NO_RANGE)
915	Var.enmRangeType = DBGCVAR_RANGE_NONE;
916	*pArg = Var;
917	}
918	return rc;
919	}
920
921	case DBGCVAR_TYPE_NUMBER:
922	{
923	RTGCPTR GCPtr = (RTGCPTR)pArg->u.u64Number;
924	pArg->enmType = DBGCVAR_TYPE_GC_FLAT;
925	pArg->u.GCFlat = GCPtr;
926	return VINF_SUCCESS;
927	}
928
929	default:
930	AssertMsgFailedReturn(("Invalid type %d\n", pArg->enmType), VERR_DBGC_PARSE_INCORRECT_ARG_TYPE);
931	}
932	break; /* (not reached) */
933
934	/*
935	* Number with or without a range.
936	* Numbers can be resolved from symbols, but we cannot demote a pointer
937	* to a number.
938	*/
939	case DBGCVAR_CAT_NUMBER_NO_RANGE:
940	if (pArg->enmRangeType != DBGCVAR_RANGE_NONE)
941	return VERR_DBGC_PARSE_NO_RANGE_ALLOWED;
942	/* fallthru */
943	case DBGCVAR_CAT_NUMBER:
944	switch (pArg->enmType)
945	{
946	case DBGCVAR_TYPE_GC_FLAT:
947	case DBGCVAR_TYPE_GC_FAR:
948	case DBGCVAR_TYPE_GC_PHYS:
949	case DBGCVAR_TYPE_HC_FLAT:
950	case DBGCVAR_TYPE_HC_PHYS:
951	return VERR_DBGC_PARSE_INCORRECT_ARG_TYPE;
952
953	case DBGCVAR_TYPE_NUMBER:
954	return VINF_SUCCESS;
955
956	case DBGCVAR_TYPE_SYMBOL:
957	case DBGCVAR_TYPE_STRING:
958	{
959	DBGCVAR Var;
960	int rc = dbgcSymbolGet(pDbgc, pArg->u.pszString, DBGCVAR_TYPE_NUMBER, &Var);
961	if (RT_SUCCESS(rc))
962	{
963	/* deal with range */
964	if (pArg->enmRangeType != DBGCVAR_RANGE_NONE)
965	{
966	Var.enmRangeType = pArg->enmRangeType;
967	Var.u64Range = pArg->u64Range;
968	}
969	else if (enmCategory == DBGCVAR_CAT_POINTER_NO_RANGE)
970	Var.enmRangeType = DBGCVAR_RANGE_NONE;
971	*pArg = Var;
972	}
973	return rc;
974	}
975
976	default:
977	AssertMsgFailedReturn(("Invalid type %d\n", pArg->enmType), VERR_DBGC_PARSE_INCORRECT_ARG_TYPE);
978	}
979	break; /* (not reached) */
980
981	/*
982	* Symbols and strings are basically the same thing for the time being.
983	*/
984	case DBGCVAR_CAT_STRING:
985	case DBGCVAR_CAT_SYMBOL:
986	{
987	switch (pArg->enmType)
988	{
989	case DBGCVAR_TYPE_STRING:
990	if (enmCategory == DBGCVAR_CAT_SYMBOL)
991	pArg->enmType = DBGCVAR_TYPE_SYMBOL;
992	return VINF_SUCCESS;
993
994	case DBGCVAR_TYPE_SYMBOL:
995	if (enmCategory == DBGCVAR_CAT_STRING)
996	pArg->enmType = DBGCVAR_TYPE_STRING;
997	return VINF_SUCCESS;
998	default:
999	break;
1000	}
1001
1002	/* Stringify numeric and pointer values. */
1003	size_t cbScratch = sizeof(pDbgc->achScratch) - (pDbgc->pszScratch - &pDbgc->achScratch[0]);
1004	size_t cch = pDbgc->CmdHlp.pfnStrPrintf(&pDbgc->CmdHlp, pDbgc->pszScratch, cbScratch, "%Dv", pArg);
1005	if (cch + 1 >= cbScratch)
1006	return VERR_DBGC_PARSE_NO_SCRATCH;
1007
1008	pArg->enmType = enmCategory == DBGCVAR_CAT_STRING ? DBGCVAR_TYPE_STRING : DBGCVAR_TYPE_SYMBOL;
1009	pArg->u.pszString = pDbgc->pszScratch;
1010	pArg->enmRangeType = DBGCVAR_RANGE_BYTES;
1011	pArg->u64Range = cch;
1012
1013	pDbgc->pszScratch += cch + 1;
1014	return VINF_SUCCESS;
1015	}
1016
1017	/*
1018	* These are not yet implemented.
1019	*/
1020	case DBGCVAR_CAT_OPTION:
1021	case DBGCVAR_CAT_OPTION_STRING:
1022	case DBGCVAR_CAT_OPTION_NUMBER:
1023	AssertMsgFailedReturn(("Not implemented enmCategory=%d\n", enmCategory), VERR_DBGC_PARSE_NOT_IMPLEMENTED);
1024
1025	default:
1026	AssertMsgFailedReturn(("Bad enmCategory=%d\n", enmCategory), VERR_DBGC_PARSE_NOT_IMPLEMENTED);
1027	}
1028	}
1029
1030
1031	/**
1032	* Parses the arguments of one command.
1033	*
1034	* @returns VBox statuc code. On parser errors the index of the troublesome
1035	* argument is indicated by *pcArg.
1036	*
1037	* @param pDbgc Debugger console instance data.
1038	* @param pszCmdOrFunc The name of the function or command. (For logging.)
1039	* @param cArgsMin See DBGCCMD::cArgsMin and DBGCFUNC::cArgsMin.
1040	* @param cArgsMax See DBGCCMD::cArgsMax and DBGCFUNC::cArgsMax.
1041	* @param paVarDescs See DBGCCMD::paVarDescs and DBGCFUNC::paVarDescs.
1042	* @param cVarDescs See DBGCCMD::cVarDescs and DBGCFUNC::cVarDescs.
1043	* @param pszArg Pointer to the arguments to parse.
1044	* @param piArg Where to return the index of the first argument in
1045	* DBGC::aArgs. Always set. Caller must restore DBGC::iArg
1046	* to this value when done, even on failure.
1047	* @param pcArgs Where to store the number of arguments. In the event
1048	* of an error this is (ab)used to store the index of the
1049	* offending argument.
1050	*/
1051	static int dbgcProcessArguments(PDBGC pDbgc, const char *pszCmdOrFunc,
1052	uint32_t const cArgsMin, uint32_t const cArgsMax,
1053	PCDBGCVARDESC const paVarDescs, uint32_t const cVarDescs,
1054	char pszArgs, unsigned piArg, unsigned *pcArgs)
1055	{
1056	Log2(("dbgcProcessArguments: pszCmdOrFunc=%s pszArgs='%s'\n", pszCmdOrFunc, pszArgs));
1057
1058	/*
1059	* Check if we have any argument and if the command takes any.
1060	*/
1061	*piArg = pDbgc->iArg;
1062	*pcArgs = 0;
1063	/* strip leading blanks. */
1064	while (pszArgs && RT_C_IS_BLANK(pszArgs))
1065	pszArgs++;
1066	if (!*pszArgs)
1067	{
1068	if (!cArgsMin)
1069	return VINF_SUCCESS;
1070	return VERR_DBGC_PARSE_TOO_FEW_ARGUMENTS;
1071	}
1072	if (!cArgsMax)
1073	return VERR_DBGC_PARSE_TOO_MANY_ARGUMENTS;
1074
1075	/*
1076	* The parse loop.
1077	*/
1078	PDBGCVAR pArg = &pDbgc->aArgs[pDbgc->iArg];
1079	PCDBGCVARDESC pPrevDesc = NULL;
1080	unsigned cCurDesc = 0;
1081	unsigned iVar = 0;
1082	unsigned iVarDesc = 0;
1083	*pcArgs = 0;
1084	do
1085	{
1086	/*
1087	* Can we have another argument?
1088	*/
1089	if (*pcArgs >= cArgsMax)
1090	return VERR_DBGC_PARSE_TOO_MANY_ARGUMENTS;
1091	if (pDbgc->iArg >= RT_ELEMENTS(pDbgc->aArgs))
1092	return VERR_DBGC_PARSE_ARGUMENT_OVERFLOW;
1093	if (iVarDesc >= cVarDescs)
1094	return VERR_DBGC_PARSE_TOO_MANY_ARGUMENTS;
1095
1096	/* Walk argument descriptors. */
1097	if (cCurDesc >= paVarDescs[iVarDesc].cTimesMax)
1098	{
1099	iVarDesc++;
1100	if (iVarDesc >= cVarDescs)
1101	return VERR_DBGC_PARSE_TOO_MANY_ARGUMENTS;
1102	cCurDesc = 0;
1103	}
1104
1105	/*
1106	* Find the end of the argument. This is just rough splitting,
1107	* dbgcEvalSub will do stricter syntax checking later on.
1108	*/
1109	int cPar = 0;
1110	char chQuote = '\0';
1111	char *pszEnd = NULL;
1112	char *psz = pszArgs;
1113	char ch;
1114	bool fBinary = false;
1115	for (;;)
1116	{
1117	/*
1118	* Check for the end.
1119	*/
1120	if ((ch = *psz) == '\0')
1121	{
1122	if (chQuote)
1123	return VERR_DBGC_PARSE_UNBALANCED_QUOTE;
1124	if (cPar)
1125	return VERR_DBGC_PARSE_UNBALANCED_PARENTHESIS;
1126	pszEnd = psz;
1127	break;
1128	}
1129	/*
1130	* When quoted we ignore everything but the quotation char.
1131	* We use the REXX way of escaping the quotation char, i.e. double occurrence.
1132	*/
1133	else if (chQuote)
1134	{
1135	if (ch == chQuote)
1136	{
1137	if (psz[1] == chQuote)
1138	psz++; /* skip the escaped quote char */
1139	else
1140	{
1141	chQuote = '\0'; /* end of quoted string. */
1142	fBinary = true;
1143	}
1144	}
1145	}
1146	else if (ch == '\'' \|\| ch == '"')
1147	{
1148	if (fBinary)
1149	return VERR_DBGC_PARSE_EXPECTED_BINARY_OP;
1150	chQuote = ch;
1151	}
1152	/*
1153	* Parenthesis can of course be nested.
1154	*/
1155	else if (ch == '(')
1156	{
1157	cPar++;
1158	fBinary = false;
1159	}
1160	else if (ch == ')')
1161	{
1162	if (!cPar)
1163	return VERR_DBGC_PARSE_UNBALANCED_PARENTHESIS;
1164	cPar--;
1165	fBinary = true;
1166	}
1167	else if (!cPar)
1168	{
1169	/*
1170	* Encountering a comma is a definite end of parameter.
1171	*/
1172	if (ch == ',')
1173	{
1174	pszEnd = psz++;
1175	break;
1176	}
1177
1178	/*
1179	* Encountering blanks may mean the end of it all. A binary
1180	* operator will force continued parsing.
1181	*/
1182	if (RT_C_IS_BLANK(ch))
1183	{
1184	pszEnd = psz++; /* in case it's the end. */
1185	while (RT_C_IS_BLANK(*psz))
1186	psz++;
1187
1188	if (*psz == ',')
1189	{
1190	psz++;
1191	break;
1192	}
1193
1194	PCDBGCOP pOp = dbgcOperatorLookup(pDbgc, psz, fBinary, ' ');
1195	if (!pOp \|\| pOp->fBinary != fBinary)
1196	break; /* the end. */
1197
1198	psz += pOp->cchName;
1199	while (RT_C_IS_BLANK(psz)) / skip blanks so we don't get here again */
1200	psz++;
1201	fBinary = false;
1202	continue;
1203	}
1204
1205	/*
1206	* Look for operators without a space up front.
1207	*/
1208	if (dbgcIsOpChar(ch))
1209	{
1210	PCDBGCOP pOp = dbgcOperatorLookup(pDbgc, psz, fBinary, ' ');
1211	if (pOp)
1212	{
1213	if (pOp->fBinary != fBinary)
1214	{
1215	pszEnd = psz;
1216	/** @todo this is a parsing error really. */
1217	break; /* the end. */
1218	}
1219	psz += pOp->cchName;
1220	while (RT_C_IS_BLANK(psz)) / skip blanks so we don't get here again */
1221	psz++;
1222	fBinary = false;
1223	continue;
1224	}
1225	}
1226	fBinary = true;
1227	}
1228
1229	/* next char */
1230	psz++;
1231	}
1232	*pszEnd = '\0';
1233	/* (psz = next char to process) */
1234	size_t cchArgs = strlen(pszArgs);
1235
1236	/*
1237	* Try optional arguments until we find something which matches
1238	* or can easily be promoted to what the descriptor want.
1239	*/
1240	for (;;)
1241	{
1242	char pszArgsCopy = (char )RTMemDup(pszArgs, cchArgs + 1);
1243	if (!pszArgsCopy)
1244	return VERR_DBGC_PARSE_NO_MEMORY;
1245
1246	int rc = dbgcEvalSub(pDbgc, pszArgs, cchArgs, paVarDescs[iVarDesc].enmCategory, pArg);
1247	if (RT_SUCCESS(rc))
1248	rc = dbgcCheckAndTypePromoteArgument(pDbgc, paVarDescs[iVarDesc].enmCategory, pArg);
1249	if (RT_SUCCESS(rc))
1250	{
1251	pArg->pDesc = pPrevDesc = &paVarDescs[iVarDesc];
1252	cCurDesc++;
1253	RTMemFree(pszArgsCopy);
1254	break;
1255	}
1256
1257	memcpy(pszArgs, pszArgsCopy, cchArgs + 1);
1258	RTMemFree(pszArgsCopy);
1259
1260	/* Continue searching optional descriptors? */
1261	if ( rc != VERR_DBGC_PARSE_INCORRECT_ARG_TYPE
1262	&& rc != VERR_DBGC_PARSE_INVALID_NUMBER
1263	&& rc != VERR_DBGC_PARSE_NO_RANGE_ALLOWED
1264	)
1265	return rc;
1266
1267	/* Try advance to the next descriptor. */
1268	if (paVarDescs[iVarDesc].cTimesMin > cCurDesc)
1269	return rc;
1270	iVarDesc++;
1271	if (!cCurDesc)
1272	while ( iVarDesc < cVarDescs
1273	&& (paVarDescs[iVarDesc].fFlags & DBGCVD_FLAGS_DEP_PREV))
1274	iVarDesc++;
1275	if (iVarDesc >= cVarDescs)
1276	return rc;
1277	cCurDesc = 0;
1278	}
1279
1280	/*
1281	* Next argument.
1282	*/
1283	iVar++;
1284	pArg++;
1285	pDbgc->iArg++;
1286	*pcArgs += 1;
1287	pszArgs = psz;
1288	while (pszArgs && RT_C_IS_BLANK(pszArgs))
1289	pszArgs++;
1290	} while (*pszArgs);
1291
1292	/*
1293	* Check that the rest of the argument descriptors indicate optional args.
1294	*/
1295	if (iVarDesc < cVarDescs)
1296	{
1297	if (cCurDesc < paVarDescs[iVarDesc].cTimesMin)
1298	return VERR_DBGC_PARSE_TOO_FEW_ARGUMENTS;
1299	iVarDesc++;
1300	while (iVarDesc < cVarDescs)
1301	{
1302	if (paVarDescs[iVarDesc].cTimesMin)
1303	return VERR_DBGC_PARSE_TOO_FEW_ARGUMENTS;
1304	iVarDesc++;
1305	}
1306	}
1307
1308	return VINF_SUCCESS;
1309	}
1310
1311
1312	/**
1313	* Evaluate one command.
1314	*
1315	* @returns VBox status code. This is also stored in DBGC::rcCmd.
1316	*
1317	* @param pDbgc Debugger console instance data.
1318	* @param pszCmd Pointer to the command.
1319	* @param cchCmd Length of the command.
1320	* @param fNoExecute Indicates that no commands should actually be executed.
1321	*/
1322	int dbgcEvalCommand(PDBGC pDbgc, char *pszCmd, size_t cchCmd, bool fNoExecute)
1323	{
1324	char *pszCmdInput = pszCmd;
1325
1326	/*
1327	* Skip blanks.
1328	*/
1329	while (RT_C_IS_BLANK(*pszCmd))
1330	pszCmd++, cchCmd--;
1331
1332	/* external command? */
1333	bool const fExternal = *pszCmd == '.';
1334	if (fExternal)
1335	pszCmd++, cchCmd--;
1336
1337	/*
1338	* Find arguments.
1339	*/
1340	char *pszArgs = pszCmd;
1341	while (RT_C_IS_ALNUM(pszArgs) \|\| pszArgs == '_')
1342	pszArgs++;
1343	if ( (pszArgs && !RT_C_IS_BLANK(pszArgs))
1344	\|\| !RT_C_IS_ALPHA(*pszCmd))
1345	{
1346	DBGCCmdHlpPrintf(&pDbgc->CmdHlp, "Syntax error: Invalid command '%s'!\n", pszCmdInput);
1347	return pDbgc->rcCmd = VERR_DBGC_PARSE_INVALD_COMMAND_NAME;
1348	}
1349
1350	/*
1351	* Find the command.
1352	*/
1353	PCDBGCCMD pCmd = dbgcCommandLookup(pDbgc, pszCmd, pszArgs - pszCmd, fExternal);
1354	if (!pCmd)
1355	{
1356	DBGCCmdHlpPrintf(&pDbgc->CmdHlp, "Syntax error: Unknown command '%s'!\n", pszCmdInput);
1357	return pDbgc->rcCmd = VERR_DBGC_PARSE_COMMAND_NOT_FOUND;
1358	}
1359
1360	/*
1361	* Parse arguments (if any).
1362	*/
1363	unsigned iArg;
1364	unsigned cArgs;
1365	int rc = dbgcProcessArguments(pDbgc, pCmd->pszCmd,
1366	pCmd->cArgsMin, pCmd->cArgsMax, pCmd->paArgDescs, pCmd->cArgDescs,
1367	pszArgs, &iArg, &cArgs);
1368	if (RT_SUCCESS(rc))
1369	{
1370	AssertMsg(rc == VINF_SUCCESS, ("%Rrc\n", rc));
1371
1372	/*
1373	* Execute the command.
1374	*/
1375	if (!fNoExecute)
1376	rc = pCmd->pfnHandler(pCmd, &pDbgc->CmdHlp, pDbgc->pUVM, &pDbgc->aArgs[iArg], cArgs);
1377	pDbgc->rcCmd = rc;
1378	pDbgc->iArg = iArg;
1379	if (rc == VERR_DBGC_COMMAND_FAILED)
1380	rc = VINF_SUCCESS;
1381	}
1382	else
1383	{
1384	pDbgc->rcCmd = rc;
1385	pDbgc->iArg = iArg;
1386
1387	/* report parse / eval error. */
1388	switch (rc)
1389	{
1390	case VERR_DBGC_PARSE_TOO_FEW_ARGUMENTS:
1391	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1392	"Syntax error: Too few arguments. Minimum is %d for command '%s'.\n", pCmd->cArgsMin, pCmd->pszCmd);
1393	break;
1394	case VERR_DBGC_PARSE_TOO_MANY_ARGUMENTS:
1395	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1396	"Syntax error: Too many arguments. Maximum is %d for command '%s'.\n", pCmd->cArgsMax, pCmd->pszCmd);
1397	break;
1398	case VERR_DBGC_PARSE_ARGUMENT_OVERFLOW:
1399	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1400	"Syntax error: Too many arguments.\n");
1401	break;
1402	case VERR_DBGC_PARSE_UNBALANCED_QUOTE:
1403	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1404	"Syntax error: Unbalanced quote (argument %d).\n", cArgs);
1405	break;
1406	case VERR_DBGC_PARSE_UNBALANCED_PARENTHESIS:
1407	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1408	"Syntax error: Unbalanced parenthesis (argument %d).\n", cArgs);
1409	break;
1410	case VERR_DBGC_PARSE_EMPTY_ARGUMENT:
1411	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1412	"Syntax error: An argument or subargument contains nothing useful (argument %d).\n", cArgs);
1413	break;
1414	case VERR_DBGC_PARSE_UNEXPECTED_OPERATOR:
1415	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1416	"Syntax error: Invalid operator usage (argument %d).\n", cArgs);
1417	break;
1418	case VERR_DBGC_PARSE_INVALID_NUMBER:
1419	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1420	"Syntax error: Invalid numeric value (argument %d). If a string was the intention, then quote it.\n", cArgs);
1421	break;
1422	case VERR_DBGC_PARSE_NUMBER_TOO_BIG:
1423	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1424	"Error: Numeric overflow (argument %d).\n", cArgs);
1425	break;
1426	case VERR_DBGC_PARSE_INVALID_OPERATION:
1427	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1428	"Error: Invalid operation attempted (argument %d).\n", cArgs);
1429	break;
1430	case VERR_DBGC_PARSE_FUNCTION_NOT_FOUND:
1431	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1432	"Error: Function not found (argument %d).\n", cArgs);
1433	break;
1434	case VERR_DBGC_PARSE_NOT_A_FUNCTION:
1435	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1436	"Error: The function specified is not a function (argument %d).\n", cArgs);
1437	break;
1438	case VERR_DBGC_PARSE_NO_MEMORY:
1439	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1440	"Error: Out memory in the regular heap! Expect odd stuff to happen...\n");
1441	break;
1442	case VERR_DBGC_PARSE_INCORRECT_ARG_TYPE:
1443	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1444	"Error: Incorrect argument type (argument %d?).\n", cArgs);
1445	break;
1446	case VERR_DBGC_PARSE_VARIABLE_NOT_FOUND:
1447	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1448	"Error: An undefined variable was referenced (argument %d).\n", cArgs);
1449	break;
1450	case VERR_DBGC_PARSE_CONVERSION_FAILED:
1451	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1452	"Error: A conversion between two types failed (argument %d).\n", cArgs);
1453	break;
1454	case VERR_DBGC_PARSE_NOT_IMPLEMENTED:
1455	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1456	"Error: You hit a debugger feature which isn't implemented yet (argument %d).\n", cArgs);
1457	break;
1458	case VERR_DBGC_PARSE_BAD_RESULT_TYPE:
1459	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1460	"Error: Couldn't satisfy a request for a specific result type (argument %d). (Usually applies to symbols)\n", cArgs);
1461	break;
1462	case VERR_DBGC_PARSE_WRITEONLY_SYMBOL:
1463	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp,
1464	"Error: Cannot get symbol, it's set only (argument %d).\n", cArgs);
1465	break;
1466
1467	case VERR_DBGC_COMMAND_FAILED:
1468	break;
1469
1470	default:
1471	{
1472	PCRTSTATUSMSG pErr = RTErrGet(rc);
1473	if (strncmp(pErr->pszDefine, RT_STR_TUPLE("Unknown Status")))
1474	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp, "Error: %s (%d) - %s\n", pErr->pszDefine, rc, pErr->pszMsgFull);
1475	else
1476	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp, "Error: Unknown error %d (%#x)!\n", rc, rc);
1477	break;
1478	}
1479	}
1480	}
1481
1482	return rc;
1483	}
1484
1485
1486	/**
1487	* Loads the script in @a pszFilename and executes the commands within.
1488	*
1489	* @returns VBox status code. Will complain about error to console.
1490	* @param pDbgc Debugger console instance data.
1491	* @param pszFilename The path to the script file.
1492	* @param fAnnounce Whether to announce the script.
1493	*/
1494	int dbgcEvalScript(PDBGC pDbgc, const char *pszFilename, bool fAnnounce)
1495	{
1496	FILE *pFile = fopen(pszFilename, "r");
1497	if (!pFile)
1498	return DBGCCmdHlpPrintf(&pDbgc->CmdHlp, "Failed to open '%s'.\n", pszFilename);
1499	if (fAnnounce)
1500	DBGCCmdHlpPrintf(&pDbgc->CmdHlp, "Running script '%s'...\n", pszFilename);
1501
1502	/*
1503	* Execute it line by line.
1504	*/
1505	int rc = VINF_SUCCESS;
1506	unsigned iLine = 0;
1507	char szLine[8192];
1508	while (fgets(szLine, sizeof(szLine), pFile))
1509	{
1510	/* check that the line isn't too long. */
1511	char *pszEnd = strchr(szLine, '\0');
1512	if (pszEnd == &szLine[sizeof(szLine) - 1])
1513	{
1514	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp, "runscript error: Line #%u is too long\n", iLine);
1515	break;
1516	}
1517	iLine++;
1518
1519	/* strip leading blanks and check for comment / blank line. */
1520	char *psz = RTStrStripL(szLine);
1521	if ( *psz == '\0'
1522	\|\| *psz == '\n'
1523	\|\| *psz == '#')
1524	continue;
1525
1526	/* strip trailing blanks and check for empty line (\r case). */
1527	while ( pszEnd > psz
1528	&& RT_C_IS_SPACE(pszEnd[-1])) /* RT_C_IS_SPACE includes \n and \r normally. */
1529	*--pszEnd = '\0';
1530
1531	/** @todo check for Control-C / Cancel at this point... */
1532
1533	/*
1534	* Execute the command.
1535	*
1536	* This is a bit wasteful with scratch space btw., can fix it later.
1537	* The whole return code crap should be fixed too, so that it's possible
1538	* to know whether a command succeeded (RT_SUCCESS()) or failed, and
1539	* more importantly why it failed.
1540	*/
1541	/** @todo optimize this. */
1542	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "%s", psz);
1543	if (RT_FAILURE(rc))
1544	{
1545	if (rc == VERR_BUFFER_OVERFLOW)
1546	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp, "runscript error: Line #%u is too long (exec overflowed)\n", iLine);
1547	break;
1548	}
1549	if (rc == VWRN_DBGC_CMD_PENDING)
1550	{
1551	rc = DBGCCmdHlpPrintf(&pDbgc->CmdHlp, "runscript error: VWRN_DBGC_CMD_PENDING on line #%u, script terminated\n", iLine);
1552	break;
1553	}
1554	}
1555
1556	fclose(pFile);
1557	return rc;
1558	}
1559

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source: vbox/trunk/src/VBox/Debugger/DBGCEval.cpp@ 61571

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