VBoxCPP.cpp@ 96407

Last change on this file since 96407 was 96407, checked in by vboxsync, 2 years ago
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1	/* $Id: VBoxCPP.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* VBox Build Tool - A mini C Preprocessor.
4	*
5	* Purposes to which this preprocessor will be put:
6	* - Preprocessig vm.h into dtrace/lib/vm.d so we can access the VM
7	* structure (as well as substructures) from DTrace without having
8	* to handcraft it all.
9	* - Removing \#ifdefs relating to a new feature that has become
10	* stable and no longer needs \#ifdef'ing.
11	* - Pretty printing preprocessor directives. This will be used by
12	* SCM.
13	*/
14
15	/*
16	* Copyright (C) 2012-2022 Oracle and/or its affiliates.
17	*
18	* This file is part of VirtualBox base platform packages, as
19	* available from https://www.virtualbox.org.
20	*
21	* This program is free software; you can redistribute it and/or
22	* modify it under the terms of the GNU General Public License
23	* as published by the Free Software Foundation, in version 3 of the
24	* License.
25	*
26	* This program is distributed in the hope that it will be useful, but
27	* WITHOUT ANY WARRANTY; without even the implied warranty of
28	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29	* General Public License for more details.
30	*
31	* You should have received a copy of the GNU General Public License
32	* along with this program; if not, see <https://www.gnu.org/licenses>.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#include <VBox/VBoxTpG.h>
42
43	#include <iprt/alloca.h>
44	#include <iprt/assert.h>
45	#include <iprt/asm.h>
46	#include <iprt/ctype.h>
47	#include <iprt/err.h>
48	#include <iprt/file.h>
49	#include <iprt/getopt.h>
50	#include <iprt/initterm.h>
51	#include <iprt/list.h>
52	#include <iprt/mem.h>
53	#include <iprt/message.h>
54	#include <iprt/path.h>
55	#include <iprt/stream.h>
56	#include <iprt/string.h>
57
58	#include "scmstream.h"
59
60
61	/*********************************************************************************************************************************
62	* Defined Constants And Macros *
63	*********************************************************************************************************************************/
64	/** The bitmap type. */
65	#define VBCPP_BITMAP_TYPE uint64_t
66	/** The bitmap size as a multiple of VBCPP_BITMAP_TYPE. */
67	#define VBCPP_BITMAP_SIZE (128 / 64)
68	/** Checks if a bit is set. */
69	#define VBCPP_BITMAP_IS_SET(a_bm, a_ch) ASMBitTest(a_bm, (a_ch) & 0x7f)
70	/** Sets a bit. */
71	#define VBCPP_BITMAP_SET(a_bm, a_ch) ASMBitSet(a_bm, (a_ch) & 0x7f)
72	/** Empties the bitmap. */
73	#define VBCPP_BITMAP_EMPTY(a_bm) do { (a_bm)[0] = 0; (a_bm)[1] = 0; } while (0)
74	/** Joins to bitmaps by OR'ing their values.. */
75	#define VBCPP_BITMAP_OR(a_bm1, a_bm2) do { (a_bm1)[0] \|= (a_bm2)[0]; (a_bm1)[1] \|= (a_bm2)[1]; } while (0)
76
77
78	/*********************************************************************************************************************************
79	* Structures and Typedefs *
80	*********************************************************************************************************************************/
81	/** Pointer to the C preprocessor instance data. */
82	typedef struct VBCPP *PVBCPP;
83
84
85	/**
86	* Variable string buffer (very simple version of SCMSTREAM).
87	*/
88	typedef struct VBCPPSTRBUF
89	{
90	/** The preprocessor instance (for error reporting). */
91	struct VBCPP *pThis;
92	/** The length of the string in the buffer. */
93	size_t cchBuf;
94	/** The string storage. */
95	char *pszBuf;
96	/** Allocated buffer space. */
97	size_t cbBufAllocated;
98	} VBCPPSTRBUF;
99	/** Pointer to a variable string buffer. */
100	typedef VBCPPSTRBUF *PVBCPPSTRBUF;
101
102
103	/**
104	* The preprocessor mode.
105	*/
106	typedef enum VBCPPMODE
107	{
108	kVBCppMode_Invalid = 0,
109	kVBCppMode_Standard,
110	kVBCppMode_Selective,
111	kVBCppMode_SelectiveD,
112	kVBCppMode_End
113	} VBCPPMODE;
114
115
116	/**
117	* A macro (aka define).
118	*/
119	typedef struct VBCPPMACRO
120	{
121	/** The string space core. */
122	RTSTRSPACECORE Core;
123	#if 0
124	/** For linking macros that have the fExpanding flag set. */
125	struct VBCPPMACRO *pUpExpanding;
126	#endif
127	/** Whether it's a function. */
128	bool fFunction;
129	/** Variable argument count. */
130	bool fVarArg;
131	/** Set if originating on the command line. */
132	bool fCmdLine;
133	/** Set if this macro is currently being expanded and should not be
134	* recursively applied. */
135	bool fExpanding;
136	/** The number of known arguments. */
137	uint32_t cArgs;
138	/** Pointer to a list of argument names. */
139	const char **papszArgs;
140	/** Lead character bitmap for the argument names. */
141	VBCPP_BITMAP_TYPE bmArgs[VBCPP_BITMAP_SIZE];
142	/** The value length. */
143	size_t cchValue;
144	/** The define value. (This is followed by the name and arguments.) */
145	char szValue[1];
146	} VBCPPMACRO;
147	/** Pointer to a macro. */
148	typedef VBCPPMACRO *PVBCPPMACRO;
149
150
151	/**
152	* Macro expansion data.
153	*/
154	typedef struct VBCPPMACROEXP
155	{
156	/** The expansion buffer. */
157	VBCPPSTRBUF StrBuf;
158	#if 0
159	/** List of expanding macros (Stack). */
160	PVBCPPMACRO pMacroStack;
161	#endif
162	/** The input stream (in case we want to look for parameter lists). */
163	PSCMSTREAM pStrmInput;
164	/** Array of argument values. Used when expanding function style macros. */
165	char **papszArgs;
166	/** The number of argument values current in papszArgs. */
167	uint32_t cArgs;
168	/** The number of argument values papszArgs can currently hold */
169	uint32_t cArgsAlloced;
170	} VBCPPMACROEXP;
171	/** Pointer to macro expansion data. */
172	typedef VBCPPMACROEXP *PVBCPPMACROEXP;
173
174
175	/**
176	* The vbcppMacroExpandReScan mode of operation.
177	*/
178	typedef enum VBCPPMACRORESCANMODE
179	{
180	/** Invalid mode. */
181	kMacroReScanMode_Invalid = 0,
182	/** Normal expansion mode. */
183	kMacroReScanMode_Normal,
184	/** Replaces known macros and heeds the 'defined' operator. */
185	kMacroReScanMode_Expression,
186	/** End of valid modes. */
187	kMacroReScanMode_End
188	} VBCPPMACRORESCANMODE;
189
190
191	/**
192	* Expression node type.
193	*/
194	typedef enum VBCPPEXPRKIND
195	{
196	kVBCppExprKind_Invalid = 0,
197	kVBCppExprKind_Unary,
198	kVBCppExprKind_Binary,
199	kVBCppExprKind_Ternary,
200	kVBCppExprKind_SignedValue,
201	kVBCppExprKind_UnsignedValue,
202	kVBCppExprKind_End
203	} VBCPPEXPRKIND;
204
205
206	/** Macro used for the precedence field. */
207	#define VBCPPOP_PRECEDENCE(a_iPrecedence) ((a_iPrecedence) << 8)
208	/** Mask for getting the precedence field value. */
209	#define VBCPPOP_PRECEDENCE_MASK 0xff00
210	/** Operator associativity - Left to right. */
211	#define VBCPPOP_L2R (1 << 16)
212	/** Operator associativity - Right to left. */
213	#define VBCPPOP_R2L (2 << 16)
214
215	/**
216	* Unary operators.
217	*/
218	typedef enum VBCPPUNARYOP
219	{
220	kVBCppUnaryOp_Invalid = 0,
221	kVBCppUnaryOp_Pluss = VBCPPOP_R2L \| VBCPPOP_PRECEDENCE( 3) \| 5,
222	kVBCppUnaryOp_Minus = VBCPPOP_R2L \| VBCPPOP_PRECEDENCE( 3) \| 6,
223	kVBCppUnaryOp_LogicalNot = VBCPPOP_R2L \| VBCPPOP_PRECEDENCE( 3) \| 7,
224	kVBCppUnaryOp_BitwiseNot = VBCPPOP_R2L \| VBCPPOP_PRECEDENCE( 3) \| 8,
225	kVBCppUnaryOp_Parenthesis = VBCPPOP_R2L \| VBCPPOP_PRECEDENCE(15) \| 9,
226	kVBCppUnaryOp_End
227	} VBCPPUNARYOP;
228
229	/**
230	* Binary operators.
231	*/
232	typedef enum VBCPPBINARYOP
233	{
234	kVBCppBinary_Invalid = 0,
235	kVBCppBinary_Multiplication = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 5) \| 2,
236	kVBCppBinary_Division = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 5) \| 4,
237	kVBCppBinary_Modulo = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 5) \| 5,
238	kVBCppBinary_Addition = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 6) \| 6,
239	kVBCppBinary_Subtraction = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 6) \| 7,
240	kVBCppBinary_LeftShift = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 7) \| 8,
241	kVBCppBinary_RightShift = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 7) \| 9,
242	kVBCppBinary_LessThan = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 8) \| 10,
243	kVBCppBinary_LessThanOrEqual = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 8) \| 11,
244	kVBCppBinary_GreaterThan = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 8) \| 12,
245	kVBCppBinary_GreaterThanOrEqual = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 8) \| 13,
246	kVBCppBinary_EqualTo = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 9) \| 14,
247	kVBCppBinary_NotEqualTo = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE( 9) \| 15,
248	kVBCppBinary_BitwiseAnd = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE(10) \| 16,
249	kVBCppBinary_BitwiseXor = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE(11) \| 17,
250	kVBCppBinary_BitwiseOr = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE(12) \| 18,
251	kVBCppBinary_LogicalAnd = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE(13) \| 19,
252	kVBCppBinary_LogicalOr = VBCPPOP_L2R \| VBCPPOP_PRECEDENCE(14) \| 20,
253	kVBCppBinary_End
254	} VBCPPBINARYOP;
255
256	/** The precedence of the ternary operator (expr ? true : false). */
257	#define VBCPPTERNAROP_PRECEDENCE VBCPPOP_PRECEDENCE(16)
258
259
260	/** Pointer to an expression parsing node. */
261	typedef struct VBCPPEXPR *PVBCPPEXPR;
262	/**
263	* Expression parsing node.
264	*/
265	typedef struct VBCPPEXPR
266	{
267	/** Parent expression. */
268	PVBCPPEXPR pParent;
269	/** Whether the expression is complete or not. */
270	bool fComplete;
271	/** The kind of expression. */
272	VBCPPEXPRKIND enmKind;
273	/** Kind specific content. */
274	union
275	{
276	/** kVBCppExprKind_Unary */
277	struct
278	{
279	VBCPPUNARYOP enmOperator;
280	PVBCPPEXPR pArg;
281	} Unary;
282
283	/** kVBCppExprKind_Binary */
284	struct
285	{
286	VBCPPBINARYOP enmOperator;
287	PVBCPPEXPR pLeft;
288	PVBCPPEXPR pRight;
289	} Binary;
290
291	/** kVBCppExprKind_Ternary */
292	struct
293	{
294	PVBCPPEXPR pExpr;
295	PVBCPPEXPR pTrue;
296	PVBCPPEXPR pFalse;
297	} Ternary;
298
299	/** kVBCppExprKind_SignedValue */
300	struct
301	{
302	int64_t s64;
303	} SignedValue;
304
305	/** kVBCppExprKind_UnsignedValue */
306	struct
307	{
308	uint64_t u64;
309	} UnsignedValue;
310	} u;
311	} VBCPPEXPR;
312
313
314	/**
315	* Operator return statuses.
316	*/
317	typedef enum VBCPPEXPRRET
318	{
319	kExprRet_Error = -1,
320	kExprRet_Ok = 0,
321	kExprRet_UnaryOperator,
322	kExprRet_Value,
323	kExprRet_EndOfExpr,
324	kExprRet_End
325	} VBCPPEXPRRET;
326
327	/**
328	* Expression parser context.
329	*/
330	typedef struct VBCPPEXPRPARSER
331	{
332	/** The current expression posistion. */
333	const char *pszCur;
334	/** The root node. */
335	PVBCPPEXPR pRoot;
336	/** The current expression node. */
337	PVBCPPEXPR pCur;
338	/** Where to insert the next expression. */
339	PVBCPPEXPR *ppCur;
340	/** The expression. */
341	const char *pszExpr;
342	/** The number of undefined macros we've encountered while parsing. */
343	size_t cUndefined;
344	/** Pointer to the C preprocessor instance. */
345	PVBCPP pThis;
346	} VBCPPEXPRPARSER;
347	/** Pointer to an expression parser context. */
348	typedef VBCPPEXPRPARSER *PVBCPPEXPRPARSER;
349
350
351	/**
352	* Evaluation result.
353	*/
354	typedef enum VBCPPEVAL
355	{
356	kVBCppEval_Invalid = 0,
357	kVBCppEval_True,
358	kVBCppEval_False,
359	kVBCppEval_Undecided,
360	kVBCppEval_End
361	} VBCPPEVAL;
362
363
364	/**
365	* The condition kind.
366	*/
367	typedef enum VBCPPCONDKIND
368	{
369	kVBCppCondKind_Invalid = 0,
370	/** \#if expr */
371	kVBCppCondKind_If,
372	/** \#ifdef define */
373	kVBCppCondKind_IfDef,
374	/** \#ifndef define */
375	kVBCppCondKind_IfNDef,
376	/** \#elif expr */
377	kVBCppCondKind_ElIf,
378	/** The end of valid values. */
379	kVBCppCondKind_End
380	} VBCPPCONDKIND;
381
382
383	/**
384	* Conditional stack entry.
385	*/
386	typedef struct VBCPPCOND
387	{
388	/** The next conditional on the stack. */
389	struct VBCPPCOND *pUp;
390	/** The kind of conditional. This changes on encountering \#elif. */
391	VBCPPCONDKIND enmKind;
392	/** Evaluation result. */
393	VBCPPEVAL enmResult;
394	/** The evaluation result of the whole stack. */
395	VBCPPEVAL enmStackResult;
396
397	/** Whether we've seen the last else. */
398	bool fSeenElse;
399	/** Set if we have an else if which has already been decided. */
400	bool fElIfDecided;
401	/** The nesting level of this condition. */
402	uint16_t iLevel;
403	/** The nesting level of this condition wrt the ones we keep. */
404	uint16_t iKeepLevel;
405
406	/** The condition string. (Points within the stream buffer.) */
407	const char *pchCond;
408	/** The condition length. */
409	size_t cchCond;
410	} VBCPPCOND;
411	/** Pointer to a conditional stack entry. */
412	typedef VBCPPCOND *PVBCPPCOND;
413
414
415	/**
416	* Input buffer stack entry.
417	*/
418	typedef struct VBCPPINPUT
419	{
420	/** Pointer to the next input on the stack. */
421	struct VBCPPINPUT *pUp;
422	/** The input stream. */
423	SCMSTREAM StrmInput;
424	/** Pointer into szName to the part which was specified. */
425	const char *pszSpecified;
426	/** The input file name with include path. */
427	char szName[1];
428	} VBCPPINPUT;
429	/** Pointer to a input buffer stack entry */
430	typedef VBCPPINPUT *PVBCPPINPUT;
431
432
433	/**
434	* The action to take with \#include.
435	*/
436	typedef enum VBCPPINCLUDEACTION
437	{
438	kVBCppIncludeAction_Invalid = 0,
439	kVBCppIncludeAction_Include,
440	kVBCppIncludeAction_PassThru,
441	kVBCppIncludeAction_Drop,
442	kVBCppIncludeAction_End
443	} VBCPPINCLUDEACTION;
444
445
446	/**
447	* C Preprocessor instance data.
448	*/
449	typedef struct VBCPP
450	{
451	/** @name Options
452	* @{ */
453	/** The preprocessing mode. */
454	VBCPPMODE enmMode;
455	/** Whether to keep comments. */
456	bool fKeepComments;
457	/** Whether to respect source defines. */
458	bool fRespectSourceDefines;
459	/** Whether to let source defines overrides the ones on the command
460	* line. */
461	bool fAllowRedefiningCmdLineDefines;
462	/** Whether to pass thru defines. */
463	bool fPassThruDefines;
464	/** Whether to allow undecided conditionals. */
465	bool fUndecidedConditionals;
466	/** Whether to pass thru D pragmas. */
467	bool fPassThruPragmaD;
468	/** Whether to pass thru STD pragmas. */
469	bool fPassThruPragmaSTD;
470	/** Whether to pass thru other pragmas. */
471	bool fPassThruPragmaOther;
472	/** Whether to remove dropped lines from the output. */
473	bool fRemoveDroppedLines;
474	/** Whether to preforme line splicing.
475	* @todo implement line splicing */
476	bool fLineSplicing;
477	/** What to do about include files. */
478	VBCPPINCLUDEACTION enmIncludeAction;
479
480	/** The number of include directories. */
481	uint32_t cIncludes;
482	/** Array of directories to search for include files. */
483	char **papszIncludes;
484
485	/** The name of the input file. */
486	const char *pszInput;
487	/** The name of the output file. NULL if stdout. */
488	const char *pszOutput;
489	/** @} */
490
491	/** The define string space. */
492	RTSTRSPACE StrSpace;
493	/** The string space holding explicitly undefined macros for selective
494	* preprocessing runs. */
495	RTSTRSPACE UndefStrSpace;
496	/** Indicates whether a C-word might need expansion.
497	* The bitmap is indexed by C-word lead character. Bits that are set
498	* indicates that the lead character is used in a \#define that we know and
499	* should expand. */
500	VBCPP_BITMAP_TYPE bmDefined[VBCPP_BITMAP_SIZE];
501
502	/** The current depth of the conditional stack. */
503	uint32_t cCondStackDepth;
504	/** Conditional stack. */
505	PVBCPPCOND pCondStack;
506	/** The current condition evaluates to kVBCppEval_False, don't output. */
507	bool fIf0Mode;
508	/** Just dropped a line and should maybe drop the current line. */
509	bool fJustDroppedLine;
510
511	/** Whether the current line could be a preprocessor line.
512	* This is set when EOL is encountered and cleared again when a
513	* non-comment-or-space character is encountered. See vbcppPreprocess. */
514	bool fMaybePreprocessorLine;
515
516	/** The input stack depth */
517	uint32_t cInputStackDepth;
518	/** The input buffer stack. */
519	PVBCPPINPUT pInputStack;
520
521	/** The output stream. */
522	SCMSTREAM StrmOutput;
523
524	/** The status of the whole job, as far as we know. */
525	RTEXITCODE rcExit;
526	/** Whether StrmOutput is valid (for vbcppTerm). */
527	bool fStrmOutputValid;
528	} VBCPP;
529
530
531	/*********************************************************************************************************************************
532	* Internal Functions *
533	*********************************************************************************************************************************/
534	static PVBCPPMACRO vbcppMacroLookup(PVBCPP pThis, const char *pszDefine, size_t cchDefine);
535	static RTEXITCODE vbcppMacroExpandIt(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t offMacro, PVBCPPMACRO pMacro, size_t offParameters);
536	static RTEXITCODE vbcppMacroExpandReScan(PVBCPP pThis, PVBCPPMACROEXP pExp, VBCPPMACRORESCANMODE enmMode, size_t *pcReplacements);
537	static void vbcppMacroExpandCleanup(PVBCPPMACROEXP pExp);
538
539
540
541	/*
542	*
543	*
544	* Message Handling.
545	* Message Handling.
546	* Message Handling.
547	* Message Handling.
548	* Message Handling.
549	*
550	*
551	*/
552
553
554	/**
555	* Displays an error message.
556	*
557	* @returns RTEXITCODE_FAILURE
558	* @param pThis The C preprocessor instance.
559	* @param pszMsg The message.
560	* @param va Message arguments.
561	*/
562	static RTEXITCODE vbcppErrorV(PVBCPP pThis, const char *pszMsg, va_list va)
563	{
564	NOREF(pThis);
565	if (pThis->pInputStack)
566	{
567	PSCMSTREAM pStrm = &pThis->pInputStack->StrmInput;
568
569	size_t const off = ScmStreamTell(pStrm);
570	size_t const iLine = ScmStreamTellLine(pStrm);
571	ScmStreamSeekByLine(pStrm, iLine);
572	size_t const offLine = ScmStreamTell(pStrm);
573
574	RTPrintf("%s:%d:%zd: error: %N.\n", pThis->pInputStack->szName, iLine + 1, off - offLine + 1, pszMsg, va);
575
576	size_t cchLine;
577	SCMEOL enmEof;
578	const char *pszLine = ScmStreamGetLineByNo(pStrm, iLine, &cchLine, &enmEof);
579	if (pszLine)
580	RTPrintf(" %.*s\n"
581	" %*s^\n",
582	cchLine, pszLine, off - offLine, "");
583
584	ScmStreamSeekAbsolute(pStrm, off);
585	}
586	else
587	RTMsgErrorV(pszMsg, va);
588	return pThis->rcExit = RTEXITCODE_FAILURE;
589	}
590
591
592	/**
593	* Displays an error message.
594	*
595	* @returns RTEXITCODE_FAILURE
596	* @param pThis The C preprocessor instance.
597	* @param pszMsg The message.
598	* @param ... Message arguments.
599	*/
600	static RTEXITCODE vbcppError(PVBCPP pThis, const char *pszMsg, ...)
601	{
602	va_list va;
603	va_start(va, pszMsg);
604	RTEXITCODE rcExit = vbcppErrorV(pThis, pszMsg, va);
605	va_end(va);
606	return rcExit;
607	}
608
609
610	/**
611	* Displays an error message.
612	*
613	* @returns RTEXITCODE_FAILURE
614	* @param pThis The C preprocessor instance.
615	* @param pszPos Pointer to the offending character.
616	* @param pszMsg The message.
617	* @param ... Message arguments.
618	*/
619	static RTEXITCODE vbcppErrorPos(PVBCPP pThis, const char pszPos, const char pszMsg, ...)
620	{
621	NOREF(pszPos); NOREF(pThis);
622	va_list va;
623	va_start(va, pszMsg);
624	RTMsgErrorV(pszMsg, va);
625	va_end(va);
626	return pThis->rcExit = RTEXITCODE_FAILURE;
627	}
628
629
630
631
632
633
634
635	/*
636	*
637	*
638	* Variable String Buffers.
639	* Variable String Buffers.
640	* Variable String Buffers.
641	* Variable String Buffers.
642	* Variable String Buffers.
643	*
644	*
645	*/
646
647
648	/**
649	* Initializes a string buffer.
650	*
651	* @param pStrBuf The buffer structure to initialize.
652	* @param pThis The C preprocessor instance.
653	*/
654	static void vbcppStrBufInit(PVBCPPSTRBUF pStrBuf, PVBCPP pThis)
655	{
656	pStrBuf->pThis = pThis;
657	pStrBuf->cchBuf = 0;
658	pStrBuf->cbBufAllocated = 0;
659	pStrBuf->pszBuf = NULL;
660	}
661
662
663	/**
664	* Deletes a string buffer.
665	*
666	* @param pStrBuf Pointer to the string buffer.
667	*/
668	static void vbcppStrBufDelete(PVBCPPSTRBUF pStrBuf)
669	{
670	RTMemFree(pStrBuf->pszBuf);
671	pStrBuf->pszBuf = NULL;
672	}
673
674
675	/**
676	* Ensures that sufficient bufferspace is available, growing the buffer if
677	* necessary.
678	*
679	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
680	* @param pStrBuf Pointer to the string buffer.
681	* @param cbMin The minimum buffer size.
682	*/
683	static RTEXITCODE vbcppStrBufGrow(PVBCPPSTRBUF pStrBuf, size_t cbMin)
684	{
685	if (pStrBuf->cbBufAllocated >= cbMin)
686	return RTEXITCODE_SUCCESS;
687
688	size_t cbNew = pStrBuf->cbBufAllocated * 2;
689	if (cbNew < cbMin)
690	cbNew = RT_ALIGN_Z(cbMin, _1K);
691	void *pv = RTMemRealloc(pStrBuf->pszBuf, cbNew);
692	if (!pv)
693	return vbcppError(pStrBuf->pThis, "out of memory (%zu bytes)", cbNew);
694
695	pStrBuf->pszBuf = (char *)pv;
696	pStrBuf->cbBufAllocated = cbNew;
697	return RTEXITCODE_SUCCESS;
698	}
699
700
701	/**
702	* Appends a substring.
703	*
704	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
705	* @param pStrBuf Pointer to the string buffer.
706	* @param pchSrc Pointer to the first character in the substring.
707	* @param cchSrc The length of the substring.
708	*/
709	static RTEXITCODE vbcppStrBufAppendN(PVBCPPSTRBUF pStrBuf, const char *pchSrc, size_t cchSrc)
710	{
711	size_t cchBuf = pStrBuf->cchBuf;
712	if (cchBuf + cchSrc + 1 > pStrBuf->cbBufAllocated)
713	{
714	RTEXITCODE rcExit = vbcppStrBufGrow(pStrBuf, cchBuf + cchSrc + 1);
715	if (rcExit != RTEXITCODE_SUCCESS)
716	return rcExit;
717	}
718
719	memcpy(&pStrBuf->pszBuf[cchBuf], pchSrc, cchSrc);
720	cchBuf += cchSrc;
721	pStrBuf->pszBuf[cchBuf] = '\0';
722	pStrBuf->cchBuf = cchBuf;
723
724	return RTEXITCODE_SUCCESS;
725	}
726
727
728	/**
729	* Appends a character.
730	*
731	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
732	* @param pStrBuf Pointer to the string buffer.
733	* @param ch The charater to append.
734	*/
735	static RTEXITCODE vbcppStrBufAppendCh(PVBCPPSTRBUF pStrBuf, char ch)
736	{
737	size_t cchBuf = pStrBuf->cchBuf;
738	if (cchBuf + 2 > pStrBuf->cbBufAllocated)
739	{
740	RTEXITCODE rcExit = vbcppStrBufGrow(pStrBuf, cchBuf + 2);
741	if (rcExit != RTEXITCODE_SUCCESS)
742	return rcExit;
743	}
744
745	pStrBuf->pszBuf[cchBuf++] = ch;
746	pStrBuf->pszBuf[cchBuf] = '\0';
747	pStrBuf->cchBuf = cchBuf;
748
749	return RTEXITCODE_SUCCESS;
750	}
751
752
753	/**
754	* Appends a string to the buffer.
755	*
756	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
757	* @param pStrBuf Pointer to the string buffer.
758	* @param psz The string to append.
759	*/
760	static RTEXITCODE vbcppStrBufAppend(PVBCPPSTRBUF pStrBuf, const char *psz)
761	{
762	return vbcppStrBufAppendN(pStrBuf, psz, strlen(psz));
763	}
764
765
766	/**
767	* Gets the last char in the buffer.
768	*
769	* @returns Last character, 0 if empty.
770	* @param pStrBuf Pointer to the string buffer.
771	*/
772	static char vbcppStrBufLastCh(PVBCPPSTRBUF pStrBuf)
773	{
774	if (!pStrBuf->cchBuf)
775	return '\0';
776	return pStrBuf->pszBuf[pStrBuf->cchBuf - 1];
777	}
778
779
780
781
782
783
784
785	/*
786	*
787	*
788	* C Identifier/Word Parsing.
789	* C Identifier/Word Parsing.
790	* C Identifier/Word Parsing.
791	* C Identifier/Word Parsing.
792	* C Identifier/Word Parsing.
793	*
794	*
795	*/
796
797
798	/**
799	* Checks if the given character is a valid C identifier lead character.
800	*
801	* @returns true / false.
802	* @param ch The character to inspect.
803	*/
804	DECLINLINE(bool) vbcppIsCIdentifierLeadChar(char ch)
805	{
806	return RT_C_IS_ALPHA(ch)
807	\|\| ch == '_';
808	}
809
810
811	/**
812	* Checks if the given character is a valid C identifier character.
813	*
814	* @returns true / false.
815	* @param ch The character to inspect.
816	*/
817	DECLINLINE(bool) vbcppIsCIdentifierChar(char ch)
818	{
819	return RT_C_IS_ALNUM(ch)
820	\|\| ch == '_';
821	}
822
823
824
825	/**
826	*
827	* @returns @c true if valid, @c false if not. Error message already displayed
828	* on failure.
829	* @param pThis The C preprocessor instance.
830	* @param pchIdentifier The start of the identifier to validate.
831	* @param cchIdentifier The length of the identifier. RTSTR_MAX if not
832	* known.
833	*/
834	static bool vbcppValidateCIdentifier(PVBCPP pThis, const char *pchIdentifier, size_t cchIdentifier)
835	{
836	if (cchIdentifier == RTSTR_MAX)
837	cchIdentifier = strlen(pchIdentifier);
838
839	if (cchIdentifier == 0)
840	{
841	vbcppErrorPos(pThis, pchIdentifier, "Zero length identifier");
842	return false;
843	}
844
845	if (!vbcppIsCIdentifierLeadChar(*pchIdentifier))
846	{
847	vbcppErrorPos(pThis, pchIdentifier, "Bad lead chararacter in identifier: '%.*s'", cchIdentifier, pchIdentifier);
848	return false;
849	}
850
851	for (size_t off = 1; off < cchIdentifier; off++)
852	{
853	if (!vbcppIsCIdentifierChar(pchIdentifier[off]))
854	{
855	vbcppErrorPos(pThis, pchIdentifier + off, "Illegal chararacter in identifier: '%.*s' (#%zu)", cchIdentifier, pchIdentifier, off + 1);
856	return false;
857	}
858	}
859
860	return true;
861	}
862
863	#if 0
864
865	/**
866	* Checks if the given character is valid C punctuation.
867	*
868	* @returns true / false.
869	* @param ch The character to inspect.
870	*/
871	DECLINLINE(bool) vbcppIsCPunctuationLeadChar(char ch)
872	{
873	switch (ch)
874	{
875	case '!':
876	case '#':
877	case '%':
878	case '&':
879	case '(':
880	case ')':
881	case '*':
882	case '+':
883	case ',':
884	case '-':
885	case '.':
886	case '/':
887	case ':':
888	case ';':
889	case '<':
890	case '=':
891	case '>':
892	case '?':
893	case '[':
894	case ']':
895	case '^':
896	case '{':
897	case '\|':
898	case '}':
899	case '~':
900	return true;
901	default:
902	return false;
903	}
904	}
905
906
907	/**
908	* Checks if the given string start with valid C punctuation.
909	*
910	* @returns 0 if not, otherwise the length of the punctuation.
911	* @param pch The which start we should evaluate.
912	* @param cchMax The maximum string length.
913	*/
914	static size_t vbcppIsCPunctuationLeadChar(const char *psz, size_t cchMax)
915	{
916	if (!cchMax)
917	return 0;
918
919	switch (psz[0])
920	{
921	case '!':
922	case '*':
923	case '/':
924	case '=':
925	case '^':
926	if (cchMax >= 2 && psz[1] == '=')
927	return 2;
928	return 1;
929
930	case '#':
931	if (cchMax >= 2 && psz[1] == '#')
932	return 2;
933	return 1;
934
935	case '%':
936	if (cchMax >= 2 && (psz[1] == '=' \|\| psz[1] == '>'))
937	return 2;
938	if (cchMax >= 2 && psz[1] == ':')
939	{
940	if (cchMax >= 4 && psz[2] == '%' && psz[3] == ':')
941	return 4;
942	return 2;
943	}
944	return 1;
945
946	case '&':
947	if (cchMax >= 2 && (psz[1] == '=' \|\| psz[1] == '&'))
948	return 2;
949	return 1;
950
951	case '(':
952	case ')':
953	case ',':
954	case '?':
955	case '[':
956	case ']':
957	case '{':
958	case '}':
959	return 1;
960
961	case '+':
962	if (cchMax >= 2 && (psz[1] == '=' \|\| psz[1] == '+'))
963	return 2;
964	return 1;
965
966	case '-':
967	if (cchMax >= 2 && (psz[1] == '=' \|\| psz[1] == '-' \|\| psz[1] == '>'))
968	return 2;
969	return 1;
970
971	case ':':
972	if (cchMax >= 2 && psz[1] == '>')
973	return 2;
974	return 1;
975
976	case ';':
977	return 1;
978
979	case '<':
980	if (cchMax >= 2 && psz[1] == '<')
981	{
982	if (cchMax >= 3 && psz[2] == '=')
983	return 3;
984	return 2;
985	}
986	if (cchMax >= 2 && (psz[1] == '=' \|\| psz[1] == ':' \|\| psz[1] == '%'))
987	return 2;
988	return 1;
989
990	case '.':
991	if (cchMax >= 3 && psz[1] == '.' && psz[2] == '.')
992	return 3;
993	return 1;
994
995	case '>':
996	if (cchMax >= 2 && psz[1] == '>')
997	{
998	if (cchMax >= 3 && psz[2] == '=')
999	return 3;
1000	return 2;
1001	}
1002	if (cchMax >= 2 && psz[1] == '=')
1003	return 2;
1004	return 1;
1005
1006	case '\|':
1007	if (cchMax >= 2 && (psz[1] == '=' \|\| psz[1] == '\|'))
1008	return 2;
1009	return 1;
1010
1011	case '~':
1012	return 1;
1013
1014	default:
1015	return 0;
1016	}
1017	}
1018
1019	#endif
1020
1021
1022
1023
1024
1025	/*
1026	*
1027	*
1028	* Output
1029	* Output
1030	* Output
1031	* Output
1032	* Output
1033	*
1034	*
1035	*/
1036
1037
1038	/**
1039	* Outputs a character.
1040	*
1041	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
1042	* @param pThis The C preprocessor instance.
1043	* @param ch The character to output.
1044	*/
1045	static RTEXITCODE vbcppOutputCh(PVBCPP pThis, char ch)
1046	{
1047	int rc = ScmStreamPutCh(&pThis->StrmOutput, ch);
1048	if (RT_SUCCESS(rc))
1049	return RTEXITCODE_SUCCESS;
1050	return vbcppError(pThis, "Output error: %Rrc", rc);
1051	}
1052
1053
1054	/**
1055	* Outputs a string.
1056	*
1057	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
1058	* @param pThis The C preprocessor instance.
1059	* @param pch The string.
1060	* @param cch The number of characters to write.
1061	*/
1062	static RTEXITCODE vbcppOutputWrite(PVBCPP pThis, const char *pch, size_t cch)
1063	{
1064	int rc = ScmStreamWrite(&pThis->StrmOutput, pch, cch);
1065	if (RT_SUCCESS(rc))
1066	return RTEXITCODE_SUCCESS;
1067	return vbcppError(pThis, "Output error: %Rrc", rc);
1068	}
1069
1070
1071	static RTEXITCODE vbcppOutputComment(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart, size_t cchOutputted,
1072	size_t cchMinIndent)
1073	{
1074	RT_NOREF_PV(cchMinIndent); /** @todo cchMinIndent */
1075
1076	size_t offCur = ScmStreamTell(pStrmInput);
1077	if (offStart < offCur)
1078	{
1079	int rc = ScmStreamSeekAbsolute(pStrmInput, offStart);
1080	AssertRCReturn(rc, vbcppError(pThis, "Input seek error: %Rrc", rc));
1081
1082	/*
1083	* Use the same indent, if possible.
1084	*/
1085	size_t cchIndent = offStart - ScmStreamTellOffsetOfLine(pStrmInput, ScmStreamTellLine(pStrmInput));
1086	if (cchOutputted < cchIndent)
1087	rc = ScmStreamPrintf(&pThis->StrmOutput, "%*s", cchIndent - cchOutputted, "");
1088	else
1089	rc = ScmStreamPutCh(&pThis->StrmOutput, ' ');
1090	if (RT_FAILURE(rc))
1091	return vbcppError(pThis, "Output error: %Rrc", rc);
1092
1093	/*
1094	* Copy the bytes.
1095	*/
1096	while (ScmStreamTell(pStrmInput) < offCur)
1097	{
1098	unsigned ch = ScmStreamGetCh(pStrmInput);
1099	if (ch == ~(unsigned)0)
1100	return vbcppError(pThis, "Input error: %Rrc", rc);
1101	rc = ScmStreamPutCh(&pThis->StrmOutput, ch);
1102	if (RT_FAILURE(rc))
1103	return vbcppError(pThis, "Output error: %Rrc", rc);
1104	}
1105	}
1106
1107	return RTEXITCODE_SUCCESS;
1108	}
1109
1110
1111
1112
1113
1114	/*
1115	*
1116	*
1117	* Input
1118	* Input
1119	* Input
1120	* Input
1121	* Input
1122	*
1123	*
1124	*/
1125
1126
1127	#if 0 /* unused */
1128	/**
1129	* Skips white spaces, including escaped new-lines.
1130	*
1131	* @param pStrmInput The input stream.
1132	*/
1133	static void vbcppProcessSkipWhiteAndEscapedEol(PSCMSTREAM pStrmInput)
1134	{
1135	unsigned chPrev = ~(unsigned)0;
1136	unsigned ch;
1137	while ((ch = ScmStreamPeekCh(pStrmInput)) != ~(unsigned)0)
1138	{
1139	if (ch == '\r' \|\| ch == '\n')
1140	{
1141	if (chPrev != '\\')
1142	break;
1143	chPrev = ch;
1144	ScmStreamSeekByLine(pStrmInput, ScmStreamTellLine(pStrmInput) + 1);
1145	}
1146	else if (RT_C_IS_SPACE(ch))
1147	{
1148	chPrev = ch;
1149	ch = ScmStreamGetCh(pStrmInput);
1150	Assert(ch == chPrev);
1151	}
1152	else
1153	break;
1154	}
1155	}
1156	#endif
1157
1158
1159	/**
1160	* Skips white spaces, escaped new-lines and multi line comments.
1161	*
1162	* @param pThis The C preprocessor instance.
1163	* @param pStrmInput The input stream.
1164	*/
1165	static RTEXITCODE vbcppProcessSkipWhiteEscapedEolAndComments(PVBCPP pThis, PSCMSTREAM pStrmInput)
1166	{
1167	unsigned chPrev = ~(unsigned)0;
1168	unsigned ch;
1169	while ((ch = ScmStreamPeekCh(pStrmInput)) != ~(unsigned)0)
1170	{
1171	if (!RT_C_IS_SPACE(ch))
1172	{
1173	/* Multi-line Comment? */
1174	if (ch != '/')
1175	break; /* most definitely, not. */
1176
1177	size_t offSaved = ScmStreamTell(pStrmInput);
1178	ScmStreamGetCh(pStrmInput);
1179	if (ScmStreamPeekCh(pStrmInput) != '*')
1180	{
1181	ScmStreamSeekAbsolute(pStrmInput, offSaved);
1182	break; /* no */
1183	}
1184
1185	/* Skip to the end of the comment. */
1186	while ((ch = ScmStreamGetCh(pStrmInput)) != ~(unsigned)0)
1187	{
1188	if (ch == '*')
1189	{
1190	ch = ScmStreamGetCh(pStrmInput);
1191	if (ch == '/')
1192	break;
1193	if (ch == ~(unsigned)0)
1194	break;
1195	}
1196	}
1197	if (ch == ~(unsigned)0)
1198	return vbcppError(pThis, "unterminated multi-line comment");
1199	chPrev = '/';
1200	}
1201	/* New line (also matched by RT_C_IS_SPACE). */
1202	else if (ch == '\r' \|\| ch == '\n')
1203	{
1204	/* Stop if not escaped. */
1205	if (chPrev != '\\')
1206	break;
1207	chPrev = ch;
1208	ScmStreamSeekByLine(pStrmInput, ScmStreamTellLine(pStrmInput) + 1);
1209	}
1210	/* Real space char. */
1211	else
1212	{
1213	chPrev = ch;
1214	ch = ScmStreamGetCh(pStrmInput);
1215	Assert(ch == chPrev);
1216	}
1217	}
1218	return RTEXITCODE_SUCCESS;
1219	}
1220
1221
1222	/**
1223	* Skips white spaces, escaped new-lines, and multi line comments, then checking
1224	* that we're at the end of a line.
1225	*
1226	* @param pThis The C preprocessor instance.
1227	* @param pStrmInput The input stream.
1228	*/
1229	static RTEXITCODE vbcppProcessSkipWhiteEscapedEolAndCommentsCheckEol(PVBCPP pThis, PSCMSTREAM pStrmInput)
1230	{
1231	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
1232	if (rcExit == RTEXITCODE_SUCCESS)
1233	{
1234	unsigned ch = ScmStreamPeekCh(pStrmInput);
1235	if ( ch != ~(unsigned)0
1236	&& ch != '\r'
1237	&& ch != '\n')
1238	rcExit = vbcppError(pThis, "Did not expected anything more on this line");
1239	}
1240	return rcExit;
1241	}
1242
1243
1244	/**
1245	* Skips white spaces.
1246	*
1247	* @returns The current location upon return.
1248	* @param pStrmInput The input stream.
1249	*/
1250	static size_t vbcppProcessSkipWhite(PSCMSTREAM pStrmInput)
1251	{
1252	unsigned ch;
1253	while ((ch = ScmStreamPeekCh(pStrmInput)) != ~(unsigned)0)
1254	{
1255	if (!RT_C_IS_SPACE(ch) \|\| ch == '\r' \|\| ch == '\n')
1256	break;
1257	unsigned chCheck = ScmStreamGetCh(pStrmInput);
1258	AssertBreak(chCheck == ch);
1259	}
1260	return ScmStreamTell(pStrmInput);
1261	}
1262
1263
1264	/**
1265	* Looks for a left parenthesis in the input stream.
1266	*
1267	* Used during macro expansion. Will ignore comments, newlines and other
1268	* whitespace.
1269	*
1270	* @retval true if found. The stream position at opening parenthesis.
1271	* @retval false if not found. The stream position is unchanged.
1272	*
1273	* @param pThis The C preprocessor instance.
1274	* @param pStrmInput The input stream.
1275	*/
1276	static bool vbcppInputLookForLeftParenthesis(PVBCPP pThis, PSCMSTREAM pStrmInput)
1277	{
1278	size_t offSaved = ScmStreamTell(pStrmInput);
1279	/RTEXITCODE rcExit =/ vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
1280	unsigned ch = ScmStreamPeekCh(pStrmInput);
1281	if (ch == '(')
1282	return true;
1283
1284	int rc = ScmStreamSeekAbsolute(pStrmInput, offSaved);
1285	AssertFatalRC(rc);
1286	return false;
1287	}
1288
1289
1290	/**
1291	* Skips input until the real end of the current directive line has been
1292	* reached.
1293	*
1294	* This includes multiline comments starting on the same line
1295	*
1296	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
1297	* @param pThis The C preprocessor instance.
1298	* @param pStrmInput The input stream.
1299	* @param poffComment Where to note down the position of the final
1300	* comment. Optional.
1301	*/
1302	static RTEXITCODE vbcppInputSkipToEndOfDirectiveLine(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t *poffComment)
1303	{
1304	if (poffComment)
1305	*poffComment = ~(size_t)0;
1306
1307	RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
1308	bool fInComment = false;
1309	unsigned chPrev = 0;
1310	unsigned ch;
1311	while ((ch = ScmStreamPeekCh(pStrmInput)) != ~(unsigned)0)
1312	{
1313	if (ch == '\r' \|\| ch == '\n')
1314	{
1315	if (chPrev == '\\')
1316	{
1317	ScmStreamSeekByLine(pStrmInput, ScmStreamTellLine(pStrmInput) + 1);
1318	continue;
1319	}
1320	if (!fInComment)
1321	break;
1322	/* The expression continues after multi-line comments. Cool. :-) */
1323	}
1324	else if (!fInComment)
1325	{
1326	if (chPrev == '/' && ch == '*' )
1327	{
1328	fInComment = true;
1329	if (poffComment)
1330	*poffComment = ScmStreamTell(pStrmInput) - 1;
1331	}
1332	else if (chPrev == '/' && ch == '/')
1333	{
1334	if (poffComment)
1335	*poffComment = ScmStreamTell(pStrmInput) - 1;
1336	rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
1337	break; /* done */
1338	}
1339	}
1340	else if (ch == '/' && chPrev == '*')
1341	fInComment = false;
1342
1343	/* advance */
1344	chPrev = ch;
1345	ch = ScmStreamGetCh(pStrmInput); Assert(ch == chPrev);
1346	}
1347	return rcExit;
1348	}
1349
1350
1351	/**
1352	* Processes a multi-line comment.
1353	*
1354	* Must either string the comment or keep it. If the latter, we must refrain
1355	* from replacing C-words in it.
1356	*
1357	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
1358	* @param pThis The C preprocessor instance.
1359	* @param pStrmInput The input stream.
1360	*/
1361	static RTEXITCODE vbcppProcessMultiLineComment(PVBCPP pThis, PSCMSTREAM pStrmInput)
1362	{
1363	/* The open comment sequence. */
1364	ScmStreamGetCh(pStrmInput); /* '' /
1365	RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
1366	if ( pThis->fKeepComments
1367	&& !pThis->fIf0Mode)
1368	rcExit = vbcppOutputWrite(pThis, "/*", 2);
1369
1370	/* The comment.*/
1371	unsigned ch;
1372	while ( rcExit == RTEXITCODE_SUCCESS
1373	&& (ch = ScmStreamGetCh(pStrmInput)) != ~(unsigned)0 )
1374	{
1375	if (ch == '*')
1376	{
1377	/* Closing sequence? */
1378	unsigned ch2 = ScmStreamPeekCh(pStrmInput);
1379	if (ch2 == '/')
1380	{
1381	ScmStreamGetCh(pStrmInput);
1382	if ( pThis->fKeepComments
1383	&& !pThis->fIf0Mode)
1384	rcExit = vbcppOutputWrite(pThis, "*/", 2);
1385	break;
1386	}
1387	}
1388
1389	if (ch == '\r' \|\| ch == '\n')
1390	{
1391	if ( ( pThis->fKeepComments
1392	&& !pThis->fIf0Mode)
1393	\|\| !pThis->fRemoveDroppedLines
1394	\|\| !ScmStreamIsAtStartOfLine(&pThis->StrmOutput))
1395	rcExit = vbcppOutputCh(pThis, ch);
1396	pThis->fJustDroppedLine = false;
1397	pThis->fMaybePreprocessorLine = true;
1398	}
1399	else if ( pThis->fKeepComments
1400	&& !pThis->fIf0Mode)
1401	rcExit = vbcppOutputCh(pThis, ch);
1402
1403	if (rcExit != RTEXITCODE_SUCCESS)
1404	break;
1405	}
1406	return rcExit;
1407	}
1408
1409
1410	/**
1411	* Processes a single line comment.
1412	*
1413	* Must either string the comment or keep it. If the latter, we must refrain
1414	* from replacing C-words in it.
1415	*
1416	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
1417	* @param pThis The C preprocessor instance.
1418	* @param pStrmInput The input stream.
1419	*/
1420	static RTEXITCODE vbcppProcessOneLineComment(PVBCPP pThis, PSCMSTREAM pStrmInput)
1421	{
1422	RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
1423	SCMEOL enmEol;
1424	size_t cchLine;
1425	const char *pszLine = ScmStreamGetLine(pStrmInput, &cchLine, &enmEol); Assert(pszLine);
1426	pszLine--; cchLine++; /* unfetching the first slash. */
1427	for (;;)
1428	{
1429	if ( pThis->fKeepComments
1430	&& !pThis->fIf0Mode)
1431	rcExit = vbcppOutputWrite(pThis, pszLine, cchLine + enmEol);
1432	else if ( !pThis->fIf0Mode
1433	\|\| !pThis->fRemoveDroppedLines
1434	\|\| !ScmStreamIsAtStartOfLine(&pThis->StrmOutput) )
1435	rcExit = vbcppOutputWrite(pThis, pszLine + cchLine, enmEol);
1436	if (rcExit != RTEXITCODE_SUCCESS)
1437	break;
1438	if ( cchLine == 0
1439	\|\| pszLine[cchLine - 1] != '\\')
1440	break;
1441
1442	pszLine = ScmStreamGetLine(pStrmInput, &cchLine, &enmEol);
1443	if (!pszLine)
1444	break;
1445	}
1446	pThis->fJustDroppedLine = false;
1447	pThis->fMaybePreprocessorLine = true;
1448	return rcExit;
1449	}
1450
1451
1452	/**
1453	* Processes a double quoted string.
1454	*
1455	* Must not replace any C-words in strings.
1456	*
1457	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
1458	* @param pThis The C preprocessor instance.
1459	* @param pStrmInput The input stream.
1460	*/
1461	static RTEXITCODE vbcppProcessStringLitteral(PVBCPP pThis, PSCMSTREAM pStrmInput)
1462	{
1463	RTEXITCODE rcExit = vbcppOutputCh(pThis, '"');
1464	if (rcExit == RTEXITCODE_SUCCESS)
1465	{
1466	bool fEscaped = false;
1467	for (;;)
1468	{
1469	unsigned ch = ScmStreamGetCh(pStrmInput);
1470	if (ch == ~(unsigned)0)
1471	{
1472	rcExit = vbcppError(pThis, "Unterminated double quoted string");
1473	break;
1474	}
1475
1476	rcExit = vbcppOutputCh(pThis, ch);
1477	if (rcExit != RTEXITCODE_SUCCESS)
1478	break;
1479
1480	if (ch == '"' && !fEscaped)
1481	break;
1482	fEscaped = !fEscaped && ch == '\\';
1483	}
1484	}
1485	return rcExit;
1486	}
1487
1488
1489	/**
1490	* Processes a single quoted constant.
1491	*
1492	* Must not replace any C-words in character constants.
1493	*
1494	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
1495	* @param pThis The C preprocessor instance.
1496	* @param pStrmInput The input stream.
1497	*/
1498	static RTEXITCODE vbcppProcessCharacterConstant(PVBCPP pThis, PSCMSTREAM pStrmInput)
1499	{
1500	RTEXITCODE rcExit = vbcppOutputCh(pThis, '\'');
1501	if (rcExit == RTEXITCODE_SUCCESS)
1502	{
1503	bool fEscaped = false;
1504	for (;;)
1505	{
1506	unsigned ch = ScmStreamGetCh(pStrmInput);
1507	if (ch == ~(unsigned)0)
1508	{
1509	rcExit = vbcppError(pThis, "Unterminated singled quoted string");
1510	break;
1511	}
1512
1513	rcExit = vbcppOutputCh(pThis, ch);
1514	if (rcExit != RTEXITCODE_SUCCESS)
1515	break;
1516
1517	if (ch == '\'' && !fEscaped)
1518	break;
1519	fEscaped = !fEscaped && ch == '\\';
1520	}
1521	}
1522	return rcExit;
1523	}
1524
1525
1526	/**
1527	* Processes a integer or floating point number constant.
1528	*
1529	* Must not replace the type suffix.
1530	*
1531	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
1532	* @param pThis The C preprocessor instance.
1533	* @param pStrmInput The input stream.
1534	* @param chFirst The first character.
1535	*/
1536	static RTEXITCODE vbcppProcessNumber(PVBCPP pThis, PSCMSTREAM pStrmInput, char chFirst)
1537	{
1538	RTEXITCODE rcExit = vbcppOutputCh(pThis, chFirst);
1539
1540	unsigned ch;
1541	while ( rcExit == RTEXITCODE_SUCCESS
1542	&& (ch = ScmStreamPeekCh(pStrmInput)) != ~(unsigned)0)
1543	{
1544	if ( !vbcppIsCIdentifierChar(ch)
1545	&& ch != '.')
1546	break;
1547
1548	unsigned ch2 = ScmStreamGetCh(pStrmInput);
1549	AssertBreakStmt(ch2 == ch, rcExit = vbcppError(pThis, "internal error"));
1550	rcExit = vbcppOutputCh(pThis, ch);
1551	}
1552
1553	return rcExit;
1554	}
1555
1556
1557	/**
1558	* Processes a identifier, possibly replacing it with a definition.
1559	*
1560	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
1561	* @param pThis The C preprocessor instance.
1562	* @param pStrmInput The input stream.
1563	*/
1564	static RTEXITCODE vbcppProcessIdentifier(PVBCPP pThis, PSCMSTREAM pStrmInput)
1565	{
1566	RTEXITCODE rcExit;
1567	size_t cchDefine;
1568	const char *pchDefine = ScmStreamCGetWordM1(pStrmInput, &cchDefine);
1569	AssertReturn(pchDefine, vbcppError(pThis, "Internal error in ScmStreamCGetWordM1"));
1570
1571	/*
1572	* Does this look like a define we know?
1573	*/
1574	PVBCPPMACRO pMacro = vbcppMacroLookup(pThis, pchDefine, cchDefine);
1575	if ( pMacro
1576	&& ( !pMacro->fFunction
1577	\|\| vbcppInputLookForLeftParenthesis(pThis, pStrmInput)) )
1578	{
1579	/*
1580	* Expand it.
1581	*/
1582	VBCPPMACROEXP ExpCtx;
1583	#if 0
1584	ExpCtx.pMacroStack = NULL;
1585	#endif
1586	ExpCtx.pStrmInput = pStrmInput;
1587	ExpCtx.papszArgs = NULL;
1588	ExpCtx.cArgs = 0;
1589	ExpCtx.cArgsAlloced = 0;
1590	vbcppStrBufInit(&ExpCtx.StrBuf, pThis);
1591	rcExit = vbcppStrBufAppendN(&ExpCtx.StrBuf, pchDefine, cchDefine);
1592	if (rcExit == RTEXITCODE_SUCCESS)
1593	rcExit = vbcppMacroExpandIt(pThis, &ExpCtx, 0 /* offset */, pMacro, cchDefine);
1594	if (rcExit == RTEXITCODE_SUCCESS)
1595	rcExit = vbcppMacroExpandReScan(pThis, &ExpCtx, kMacroReScanMode_Normal, NULL);
1596	if (rcExit == RTEXITCODE_SUCCESS)
1597	{
1598	/*
1599	* Insert it into the output stream. Make sure there is a
1600	* whitespace following it.
1601	*/
1602	int rc = ScmStreamWrite(&pThis->StrmOutput, ExpCtx.StrBuf.pszBuf, ExpCtx.StrBuf.cchBuf);
1603	if (RT_SUCCESS(rc))
1604	{
1605	unsigned chAfter = ScmStreamPeekCh(pStrmInput);
1606	if (chAfter != ~(unsigned)0 && !RT_C_IS_SPACE(chAfter))
1607	rcExit = vbcppOutputCh(pThis, ' ');
1608	}
1609	else
1610	rcExit = vbcppError(pThis, "Output error: %Rrc", rc);
1611	}
1612	vbcppMacroExpandCleanup(&ExpCtx);
1613	}
1614	else
1615	{
1616	/*
1617	* Not a macro or a function-macro name match but no invocation, just
1618	* output the text unchanged.
1619	*/
1620	int rc = ScmStreamWrite(&pThis->StrmOutput, pchDefine, cchDefine);
1621	if (RT_SUCCESS(rc))
1622	rcExit = RTEXITCODE_SUCCESS;
1623	else
1624	rcExit = vbcppError(pThis, "Output error: %Rrc", rc);
1625	}
1626	return rcExit;
1627	}
1628
1629
1630
1631
1632
1633
1634
1635	/*
1636	*
1637	*
1638	* D E F I N E S / M A C R O S
1639	* D E F I N E S / M A C R O S
1640	* D E F I N E S / M A C R O S
1641	* D E F I N E S / M A C R O S
1642	* D E F I N E S / M A C R O S
1643	*
1644	*
1645	*/
1646
1647
1648	/**
1649	* Checks if a define exists.
1650	*
1651	* @returns true or false.
1652	* @param pThis The C preprocessor instance.
1653	* @param pszDefine The define name and optionally the argument
1654	* list.
1655	* @param cchDefine The length of the name. RTSTR_MAX is ok.
1656	*/
1657	static bool vbcppMacroExists(PVBCPP pThis, const char *pszDefine, size_t cchDefine)
1658	{
1659	return cchDefine > 0
1660	&& VBCPP_BITMAP_IS_SET(pThis->bmDefined, *pszDefine)
1661	&& RTStrSpaceGetN(&pThis->StrSpace, pszDefine, cchDefine) != NULL;
1662	}
1663
1664
1665	/**
1666	* Looks up a define.
1667	*
1668	* @returns Pointer to the define if found, NULL if not.
1669	* @param pThis The C preprocessor instance.
1670	* @param pszDefine The define name and optionally the argument
1671	* list.
1672	* @param cchDefine The length of the name. RTSTR_MAX is ok.
1673	*/
1674	static PVBCPPMACRO vbcppMacroLookup(PVBCPP pThis, const char *pszDefine, size_t cchDefine)
1675	{
1676	if (!cchDefine)
1677	return NULL;
1678	if (!VBCPP_BITMAP_IS_SET(pThis->bmDefined, *pszDefine))
1679	return NULL;
1680	return (PVBCPPMACRO)RTStrSpaceGetN(&pThis->StrSpace, pszDefine, cchDefine);
1681	}
1682
1683
1684	static uint32_t vbcppMacroLookupArg(PVBCPPMACRO pMacro, const char *pchName, size_t cchName)
1685	{
1686	Assert(cchName > 0);
1687
1688	char const ch = *pchName;
1689	for (uint32_t i = 0; i < pMacro->cArgs; i++)
1690	if ( pMacro->papszArgs[i][0] == ch
1691	&& !strncmp(pMacro->papszArgs[i], pchName, cchName)
1692	&& pMacro->papszArgs[i][cchName] == '\0')
1693	return i;
1694
1695	if ( pMacro->fVarArg
1696	&& cchName == sizeof("__VA_ARGS__") - 1
1697	&& !strncmp(pchName, "__VA_ARGS__", sizeof("__VA_ARGS__") - 1) )
1698	return pMacro->cArgs;
1699
1700	return UINT32_MAX;
1701	}
1702
1703
1704	static RTEXITCODE vbcppMacroExpandReplace(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t off, size_t cchToReplace,
1705	const char *pchReplacement, size_t cchReplacement)
1706	{
1707	RT_NOREF_PV(pThis);
1708
1709	/*
1710	* Figure how much space we actually need.
1711	* (Hope this whitespace stuff is correct...)
1712	*/
1713	bool const fLeadingSpace = off > 0
1714	&& !RT_C_IS_SPACE(pExp->StrBuf.pszBuf[off - 1]);
1715	bool const fTrailingSpace = off + cchToReplace < pExp->StrBuf.cchBuf
1716	&& !RT_C_IS_SPACE(pExp->StrBuf.pszBuf[off + cchToReplace]);
1717	size_t const cchActualReplacement = fLeadingSpace + cchReplacement + fTrailingSpace;
1718
1719	/*
1720	* Adjust the buffer size and contents.
1721	*/
1722	if (cchActualReplacement > cchToReplace)
1723	{
1724	size_t const offMore = cchActualReplacement - cchToReplace;
1725
1726	/* Ensure enough buffer space. */
1727	size_t cbMinBuf = offMore + pExp->StrBuf.cchBuf + 1;
1728	RTEXITCODE rcExit = vbcppStrBufGrow(&pExp->StrBuf, cbMinBuf);
1729	if (rcExit != RTEXITCODE_SUCCESS)
1730	return rcExit;
1731
1732	/* Push the chars following the replacement area down to make room. */
1733	memmove(&pExp->StrBuf.pszBuf[off + cchToReplace + offMore],
1734	&pExp->StrBuf.pszBuf[off + cchToReplace],
1735	pExp->StrBuf.cchBuf - off - cchToReplace + 1);
1736	pExp->StrBuf.cchBuf += offMore;
1737
1738	}
1739	else if (cchActualReplacement < cchToReplace)
1740	{
1741	size_t const offLess = cchToReplace - cchActualReplacement;
1742
1743	/* Pull the chars following the replacement area up. */
1744	memmove(&pExp->StrBuf.pszBuf[off + cchToReplace - offLess],
1745	&pExp->StrBuf.pszBuf[off + cchToReplace],
1746	pExp->StrBuf.cchBuf - off - cchToReplace + 1);
1747	pExp->StrBuf.cchBuf -= offLess;
1748	}
1749
1750	/*
1751	* Insert the replacement string.
1752	*/
1753	char *pszCur = &pExp->StrBuf.pszBuf[off];
1754	if (fLeadingSpace)
1755	*pszCur++ = ' ';
1756	memcpy(pszCur, pchReplacement, cchReplacement);
1757	if (fTrailingSpace)
1758	*pszCur++ = ' ';
1759
1760	Assert(strlen(pExp->StrBuf.pszBuf) == pExp->StrBuf.cchBuf);
1761
1762	return RTEXITCODE_SUCCESS;
1763	}
1764
1765
1766	static unsigned vbcppMacroExpandPeekCh(PVBCPPMACROEXP pExp, size_t *poff)
1767	{
1768	size_t off = *poff;
1769	if (off >= pExp->StrBuf.cchBuf)
1770	return pExp->pStrmInput ? ScmStreamPeekCh(pExp->pStrmInput) : ~(unsigned)0;
1771	return pExp->StrBuf.pszBuf[off];
1772	}
1773
1774
1775	static unsigned vbcppMacroExpandGetCh(PVBCPPMACROEXP pExp, size_t *poff)
1776	{
1777	size_t off = *poff;
1778	if (off >= pExp->StrBuf.cchBuf)
1779	return pExp->pStrmInput ? ScmStreamGetCh(pExp->pStrmInput) : ~(unsigned)0;
1780	*poff = off + 1;
1781	return pExp->StrBuf.pszBuf[off];
1782	}
1783
1784
1785	static RTEXITCODE vbcppMacroExpandSkipEolEx(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t *poff, unsigned chFirst)
1786	{
1787	if (chFirst == '\r')
1788	{
1789	unsigned ch2 = vbcppMacroExpandPeekCh(pExp, poff);
1790	if (ch2 == '\n')
1791	{
1792	ch2 = ScmStreamGetCh(pExp->pStrmInput);
1793	AssertReturn(ch2 == '\n', vbcppError(pThis, "internal error"));
1794	}
1795	}
1796	return RTEXITCODE_SUCCESS;
1797	}
1798
1799
1800	static RTEXITCODE vbcppMacroExpandSkipEol(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t *poff)
1801	{
1802	unsigned ch = vbcppMacroExpandGetCh(pExp, poff);
1803	AssertReturn(ch == '\r' \|\| ch == '\n', vbcppError(pThis, "internal error"));
1804	return vbcppMacroExpandSkipEolEx(pThis, pExp, poff, ch);
1805	}
1806
1807
1808	static RTEXITCODE vbcppMacroExpandSkipCommentLine(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t *poff)
1809	{
1810	unsigned ch = vbcppMacroExpandGetCh(pExp, poff);
1811	AssertReturn(ch == '/', vbcppError(pThis, "Internal error - expected '/' got '%c'", ch));
1812
1813	unsigned chPrev = 0;
1814	while ((ch = vbcppMacroExpandGetCh(pExp, poff)) != ~(unsigned)0)
1815	{
1816	if (ch == '\r' \|\| ch == '\n')
1817	{
1818	RTEXITCODE rcExit = vbcppMacroExpandSkipEolEx(pThis, pExp, poff, ch);
1819	if (rcExit != RTEXITCODE_SUCCESS)
1820	return rcExit;
1821	if (chPrev != '\\')
1822	break;
1823	}
1824
1825	chPrev = ch;
1826	}
1827	return RTEXITCODE_SUCCESS;
1828	}
1829
1830
1831	static RTEXITCODE vbcppMacroExpandSkipComment(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t *poff)
1832	{
1833	unsigned ch = vbcppMacroExpandGetCh(pExp, poff);
1834	AssertReturn(ch == '', vbcppError(pThis, "Internal error - expected '' got '%c'", ch));
1835
1836	unsigned chPrev2 = 0;
1837	unsigned chPrev = 0;
1838	while ((ch = vbcppMacroExpandGetCh(pExp, poff)) != ~(unsigned)0)
1839	{
1840	if (ch == '/' && chPrev == '*')
1841	break;
1842
1843	if (ch == '\r' \|\| ch == '\n')
1844	{
1845	RTEXITCODE rcExit = vbcppMacroExpandSkipEolEx(pThis, pExp, poff, ch);
1846	if (rcExit != RTEXITCODE_SUCCESS)
1847	return rcExit;
1848	if (chPrev == '\\')
1849	{
1850	chPrev = chPrev2; /* for line splicing */
1851	continue;
1852	}
1853	}
1854
1855	chPrev2 = chPrev;
1856	chPrev = ch;
1857	}
1858	return RTEXITCODE_SUCCESS;
1859	}
1860
1861
1862	static RTEXITCODE vbcppMacroExpandGrowArgArray(PVBCPP pThis, PVBCPPMACROEXP pExp, uint32_t cMinArgs)
1863	{
1864	if (cMinArgs > pExp->cArgsAlloced)
1865	{
1866	void pv = RTMemRealloc(pExp->papszArgs, cMinArgs sizeof(char *));
1867	if (!pv)
1868	return vbcppError(pThis, "out of memory");
1869	pExp->papszArgs = (char **)pv;
1870	pExp->cArgsAlloced = cMinArgs;
1871	}
1872	return RTEXITCODE_SUCCESS;
1873	}
1874
1875
1876	static RTEXITCODE vbcppMacroExpandAddEmptyParameter(PVBCPP pThis, PVBCPPMACROEXP pExp)
1877	{
1878	RTEXITCODE rcExit = vbcppMacroExpandGrowArgArray(pThis, pExp, pExp->cArgs + 1);
1879	if (rcExit == RTEXITCODE_SUCCESS)
1880	{
1881	char pszArg = (char )RTMemAllocZ(1);
1882	if (pszArg)
1883	pExp->papszArgs[pExp->cArgs++] = pszArg;
1884	else
1885	rcExit = vbcppError(pThis, "out of memory");
1886	}
1887	return rcExit;
1888	}
1889
1890
1891	static RTEXITCODE vbcppMacroExpandGatherParameters(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t *poff, uint32_t cArgsHint)
1892	{
1893	RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
1894
1895	/*
1896	* Free previous argument values.
1897	*/
1898	while (pExp->cArgs > 0)
1899	{
1900	RTMemFree(pExp->papszArgs[--pExp->cArgs]);
1901	pExp->papszArgs[pExp->cArgs] = NULL;
1902	}
1903
1904	/*
1905	* The current character should be an opening parenthsis.
1906	*/
1907	unsigned ch = vbcppMacroExpandGetCh(pExp, poff);
1908	if (ch != '(')
1909	return vbcppError(pThis, "Internal error - expected '(', found '%c' (#x)", ch, ch);
1910
1911	/*
1912	* Parse the argument list.
1913	*/
1914	char chQuote = 0;
1915	size_t cbArgAlloc = 0;
1916	size_t cchArg = 0;
1917	char *pszArg = NULL;
1918	size_t cParentheses = 1;
1919	unsigned chPrev = 0;
1920	while ((ch = vbcppMacroExpandGetCh(pExp, poff)) != ~(unsigned)0)
1921	{
1922	/** @todo check for '#directives'! */
1923	if (ch == ')' && !chQuote)
1924	{
1925	Assert(cParentheses >= 1);
1926	cParentheses--;
1927
1928	/* The end? */
1929	if (!cParentheses)
1930	{
1931	if (cchArg)
1932	while (cchArg > 0 && RT_C_IS_SPACE(pszArg[cchArg - 1]))
1933	pszArg[--cchArg] = '\0';
1934	else if (pExp->cArgs \|\| cArgsHint > 0)
1935	rcExit = vbcppMacroExpandAddEmptyParameter(pThis, pExp);
1936	break;
1937	}
1938	}
1939	else if (ch == '(' && !chQuote)
1940	cParentheses++;
1941	else if (ch == ',' && cParentheses == 1 && !chQuote)
1942	{
1943	/* End of one argument, start of the next. */
1944	if (cchArg)
1945	while (cchArg > 0 && RT_C_IS_SPACE(pszArg[cchArg - 1]))
1946	pszArg[--cchArg] = '\0';
1947	else
1948	{
1949	rcExit = vbcppMacroExpandAddEmptyParameter(pThis, pExp);
1950	if (rcExit != RTEXITCODE_SUCCESS)
1951	break;
1952	}
1953
1954	cbArgAlloc = 0;
1955	cchArg = 0;
1956	pszArg = NULL;
1957	continue;
1958	}
1959	else if (ch == '/' && !chQuote)
1960	{
1961	/* Comment? */
1962	unsigned ch2 = vbcppMacroExpandPeekCh(pExp, poff);
1963	/** @todo This ain't right wrt line splicing. */
1964	if (ch2 == '/' \|\| ch == '*')
1965	{
1966	if (ch2 == '/')
1967	rcExit = vbcppMacroExpandSkipCommentLine(pThis, pExp, poff);
1968	else
1969	rcExit = vbcppMacroExpandSkipComment(pThis, pExp, poff);
1970	if (rcExit != RTEXITCODE_SUCCESS)
1971	break;
1972	continue;
1973	}
1974	}
1975	else if (ch == '"')
1976	{
1977	if (!chQuote)
1978	chQuote = '"';
1979	else if (chPrev != '\\')
1980	chQuote = 0;
1981	}
1982	else if (ch == '\'')
1983	{
1984	if (!chQuote)
1985	chQuote = '\'';
1986	else if (chPrev != '\\')
1987	chQuote = 0;
1988	}
1989	else if (ch == '\\')
1990	{
1991	/* Splice lines? */
1992	unsigned ch2 = vbcppMacroExpandPeekCh(pExp, poff);
1993	if (ch2 == '\r' \|\| ch2 == '\n')
1994	{
1995	rcExit = vbcppMacroExpandSkipEol(pThis, pExp, poff);
1996	if (rcExit != RTEXITCODE_SUCCESS)
1997	break;
1998	continue;
1999	}
2000	}
2001	else if (cchArg == 0 && RT_C_IS_SPACE(ch))
2002	continue; /* ignore spaces leading up to an argument value */
2003
2004	/* Append the character to the argument value, adding the argument
2005	to the output array if it's first character in it. */
2006	if (cchArg + 1 >= cbArgAlloc)
2007	{
2008	/* Add argument to the vector. */
2009	if (!cchArg)
2010	{
2011	rcExit = vbcppMacroExpandGrowArgArray(pThis, pExp, RT_MAX(pExp->cArgs + 1, cArgsHint));
2012	if (rcExit != RTEXITCODE_SUCCESS)
2013	break;
2014	pExp->papszArgs[pExp->cArgs++] = pszArg;
2015	}
2016
2017	/* Resize the argument value buffer. */
2018	cbArgAlloc = cbArgAlloc ? cbArgAlloc * 2 : 16;
2019	pszArg = (char *)RTMemRealloc(pszArg, cbArgAlloc);
2020	if (!pszArg)
2021	{
2022	rcExit = vbcppError(pThis, "out of memory");
2023	break;
2024	}
2025	pExp->papszArgs[pExp->cArgs - 1] = pszArg;
2026	}
2027
2028	pszArg[cchArg++] = ch;
2029	pszArg[cchArg] = '\0';
2030	}
2031
2032	/*
2033	* Check that we're leaving on good terms.
2034	*/
2035	if (rcExit == RTEXITCODE_SUCCESS)
2036	{
2037	if (cParentheses)
2038	rcExit = vbcppError(pThis, "Missing ')'");
2039	}
2040
2041	return rcExit;
2042	}
2043
2044
2045	/**
2046	* Expands the arguments referenced in the macro value.
2047	*
2048	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE + msg.
2049	* @param pThis The C preprocessor instance.
2050	* @param pExp The expansion context.
2051	* @param pMacro The macro. Must be a function macro.
2052	* @param pStrBuf String buffer containing the result. The caller
2053	* should initialize and destroy this!
2054	*/
2055	static RTEXITCODE vbcppMacroExpandValueWithArguments(PVBCPP pThis, PVBCPPMACROEXP pExp, PVBCPPMACRO pMacro,
2056	PVBCPPSTRBUF pStrBuf)
2057	{
2058	Assert(pMacro->fFunction);
2059
2060	/*
2061	* Empty?
2062	*/
2063	if ( !pMacro->cchValue
2064	\|\| (pMacro->cchValue == 1 && pMacro->szValue[0] == '#'))
2065	return RTEXITCODE_SUCCESS;
2066
2067	/*
2068	* Parse the value.
2069	*/
2070	RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
2071	const char *pszSrc = pMacro->szValue;
2072	const char *pszSrcSeq;
2073	char ch;
2074	while ((ch = *pszSrc++) != '\0')
2075	{
2076	Assert(ch != '\r'); Assert(ch != '\n'); /* probably not true atm. */
2077	if (ch == '#')
2078	{
2079	if (*pszSrc == '#')
2080	{
2081	/* Concatenate operator. */
2082	rcExit = vbcppError(pThis, "The '##' operatore is not yet implemented");
2083	}
2084	else
2085	{
2086	/* Stringify macro argument. */
2087	rcExit = vbcppError(pThis, "The '#' operatore is not yet implemented");
2088	}
2089	return rcExit;
2090	}
2091	else if (ch == '"')
2092	{
2093	/* String litteral. */
2094	pszSrcSeq = pszSrc - 1;
2095	while ((ch = *pszSrc++) != '"')
2096	{
2097	if (ch == '\\')
2098	ch = *pszSrc++;
2099	if (ch == '\0')
2100	{
2101	rcExit = vbcppError(pThis, "String litteral is missing closing quote (\").");
2102	break;
2103	}
2104	}
2105	rcExit = vbcppStrBufAppendN(pStrBuf, pszSrcSeq, pszSrc - pszSrcSeq);
2106	}
2107	else if (ch == '\'')
2108	{
2109	/* Character constant. */
2110	pszSrcSeq = pszSrc - 1;
2111	while ((ch = *pszSrc++) != '\'')
2112	{
2113	if (ch == '\\')
2114	ch = *pszSrc++;
2115	if (ch == '\0')
2116	{
2117	rcExit = vbcppError(pThis, "Character constant is missing closing quote (').");
2118	break;
2119	}
2120	}
2121	rcExit = vbcppStrBufAppendN(pStrBuf, pszSrcSeq, pszSrc - pszSrcSeq);
2122	}
2123	else if (RT_C_IS_DIGIT(ch))
2124	{
2125	/* Process numerical constants correctly (i.e. don't mess with the suffix). */
2126	pszSrcSeq = pszSrc - 1;
2127	while ( (ch = *pszSrc) != '\0'
2128	&& ( vbcppIsCIdentifierChar(ch)
2129	\|\| ch == '.') )
2130	pszSrc++;
2131	rcExit = vbcppStrBufAppendN(pStrBuf, pszSrcSeq, pszSrc - pszSrcSeq);
2132	}
2133	else if (RT_C_IS_SPACE(ch))
2134	{
2135	/* join spaces */
2136	if (RT_C_IS_SPACE(vbcppStrBufLastCh(pStrBuf)))
2137	continue;
2138	rcExit = vbcppStrBufAppendCh(pStrBuf, ch);
2139	}
2140	else if (vbcppIsCIdentifierLeadChar(ch))
2141	{
2142	/* Something we should replace? */
2143	pszSrcSeq = pszSrc - 1;
2144	while ( (ch = *pszSrc) != '\0'
2145	&& vbcppIsCIdentifierChar(ch))
2146	pszSrc++;
2147	size_t cchDefine = pszSrc - pszSrcSeq;
2148	uint32_t iArg;
2149	if ( VBCPP_BITMAP_IS_SET(pMacro->bmArgs, *pszSrcSeq)
2150	&& (iArg = vbcppMacroLookupArg(pMacro, pszSrcSeq, cchDefine)) != UINT32_MAX)
2151	{
2152	/** @todo check out spaces here! */
2153	if (iArg < pMacro->cArgs)
2154	{
2155	Assert(iArg < pExp->cArgs);
2156	rcExit = vbcppStrBufAppend(pStrBuf, pExp->papszArgs[iArg]);
2157	if (*pExp->papszArgs[iArg] != '\0' && rcExit == RTEXITCODE_SUCCESS)
2158	rcExit = vbcppStrBufAppendCh(pStrBuf, ' ');
2159	}
2160	else
2161	{
2162	/* __VA_ARGS__ */
2163	if (iArg < pExp->cArgs)
2164	{
2165	for (;;)
2166	{
2167	rcExit = vbcppStrBufAppend(pStrBuf, pExp->papszArgs[iArg]);
2168	if (rcExit != RTEXITCODE_SUCCESS)
2169	break;
2170	iArg++;
2171	if (iArg >= pExp->cArgs)
2172	break;
2173	rcExit = vbcppStrBufAppendCh(pStrBuf, ',');
2174	if (rcExit != RTEXITCODE_SUCCESS)
2175	break;
2176	}
2177	}
2178	if (rcExit == RTEXITCODE_SUCCESS)
2179	rcExit = vbcppStrBufAppendCh(pStrBuf, ' ');
2180	}
2181	}
2182	/* Not an argument needing replacing. */
2183	else
2184	rcExit = vbcppStrBufAppendN(pStrBuf, pszSrcSeq, cchDefine);
2185	}
2186	else
2187	{
2188	rcExit = vbcppStrBufAppendCh(pStrBuf, ch);
2189	}
2190	}
2191
2192	return rcExit;
2193	}
2194
2195
2196
2197	/**
2198	* Expands the given macro.
2199	*
2200	* Caller already checked if a function macro should be expanded, i.e. whether
2201	* there is a parameter list.
2202	*
2203	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE + msg.
2204	* @param pThis The C preprocessor instance.
2205	* @param pExp The expansion context.
2206	* @param offMacro Offset into the expansion buffer of the macro
2207	* invocation.
2208	* @param pMacro The macro.
2209	* @param offParameters The start of the parameter list if applicable.
2210	* Ignored if not function macro. If the
2211	* parameter list starts at the current stream
2212	* position shall be at the end of the expansion
2213	* buffer.
2214	*/
2215	static RTEXITCODE vbcppMacroExpandIt(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t offMacro, PVBCPPMACRO pMacro,
2216	size_t offParameters)
2217	{
2218	RTEXITCODE rcExit;
2219	Assert(offMacro + pMacro->Core.cchString <= pExp->StrBuf.cchBuf);
2220	Assert(!pMacro->fExpanding);
2221
2222	/*
2223	* Function macros are kind of difficult...
2224	*/
2225	if (pMacro->fFunction)
2226	{
2227	rcExit = vbcppMacroExpandGatherParameters(pThis, pExp, &offParameters, pMacro->cArgs + pMacro->fVarArg);
2228	if (rcExit == RTEXITCODE_SUCCESS)
2229	{
2230	if (pExp->cArgs > pMacro->cArgs && !pMacro->fVarArg)
2231	rcExit = vbcppError(pThis, "Too many arguments to macro '%s' - found %u, expected %u",
2232	pMacro->Core.pszString, pExp->cArgs, pMacro->cArgs);
2233	else if (pExp->cArgs < pMacro->cArgs)
2234	rcExit = vbcppError(pThis, "Too few arguments to macro '%s' - found %u, expected %u",
2235	pMacro->Core.pszString, pExp->cArgs, pMacro->cArgs);
2236	}
2237	if (rcExit == RTEXITCODE_SUCCESS)
2238	{
2239	VBCPPSTRBUF ValueBuf;
2240	vbcppStrBufInit(&ValueBuf, pThis);
2241	rcExit = vbcppMacroExpandValueWithArguments(pThis, pExp, pMacro, &ValueBuf);
2242	if (rcExit == RTEXITCODE_SUCCESS)
2243	rcExit = vbcppMacroExpandReplace(pThis, pExp, offMacro, offParameters - offMacro,
2244	ValueBuf.pszBuf, ValueBuf.cchBuf);
2245	vbcppStrBufDelete(&ValueBuf);
2246	}
2247	}
2248	/*
2249	* Object-like macros are easy. :-)
2250	*/
2251	else
2252	rcExit = vbcppMacroExpandReplace(pThis, pExp, offMacro, pMacro->Core.cchString, pMacro->szValue, pMacro->cchValue);
2253	if (rcExit == RTEXITCODE_SUCCESS)
2254	{
2255	#if 0 /* wrong */
2256	/*
2257	* Push the macro onto the stack.
2258	*/
2259	pMacro->fExpanding = true;
2260	pMacro->pUpExpanding = pExp->pMacroStack;
2261	pExp->pMacroStack = pMacro;
2262	#endif
2263	}
2264
2265	return rcExit;
2266	}
2267
2268
2269	/**
2270	* Looks for a left parenthesis in the macro expansion buffer and the input
2271	* stream.
2272	*
2273	* @retval true if found. The stream position at opening parenthesis.
2274	* @retval false if not found. The stream position is unchanged.
2275	*
2276	* @param pThis The C preprocessor instance.
2277	* @param pExp The expansion context.
2278	* @param poff The current offset in the expansion context.
2279	* Will be updated on success.
2280	*
2281	* @sa vbcppInputLookForLeftParenthesis
2282	*/
2283	static bool vbcppMacroExpandLookForLeftParenthesis(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t *poff)
2284	{
2285	/*
2286	* Search the buffer first. (No comments there.)
2287	*/
2288	size_t off = *poff;
2289	while (off < pExp->StrBuf.cchBuf)
2290	{
2291	char ch = pExp->StrBuf.pszBuf[off];
2292	if (!RT_C_IS_SPACE(ch))
2293	{
2294	if (ch == '(')
2295	{
2296	*poff = off;
2297	return true;
2298	}
2299	return false;
2300	}
2301	off++;
2302	}
2303
2304	/*
2305	* Reached the end of the buffer, continue searching in the stream.
2306	*/
2307	PSCMSTREAM pStrmInput = pExp->pStrmInput;
2308	size_t offSaved = ScmStreamTell(pStrmInput);
2309	/RTEXITCODE rcExit = / vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
2310	unsigned ch = ScmStreamPeekCh(pStrmInput);
2311	if (ch == '(')
2312	{
2313	*poff = pExp->StrBuf.cchBuf;
2314	return true;
2315	}
2316
2317	int rc = ScmStreamSeekAbsolute(pStrmInput, offSaved);
2318	AssertFatalRC(rc);
2319	return false;
2320	}
2321
2322
2323	/**
2324	* Implements the 'defined' unary operator for \#if and \#elif expressions.
2325	*
2326	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE + msg.
2327	* @param pThis The C preprocessor instance.
2328	* @param pExp The expansion context.
2329	* @param offStart The expansion buffer offset where the 'defined'
2330	* occurs.
2331	* @param poff Where to store the offset at which the re-scan
2332	* shall resume upon return.
2333	*/
2334	static RTEXITCODE vbcppMacroExpandDefinedOperator(PVBCPP pThis, PVBCPPMACROEXP pExp, size_t offStart, size_t *poff)
2335	{
2336	Assert(!pExp->pStrmInput); /* offset usage below. */
2337
2338	/*
2339	* Skip white space.
2340	*/
2341	unsigned ch;
2342	while ((ch = vbcppMacroExpandGetCh(pExp, poff)) != ~(unsigned)0)
2343	if (!RT_C_IS_SPACE(ch))
2344	break;
2345	bool const fWithParenthesis = ch == '(';
2346	if (fWithParenthesis)
2347	while ((ch = vbcppMacroExpandGetCh(pExp, poff)) != ~(unsigned)0)
2348	if (!RT_C_IS_SPACE(ch))
2349	break;
2350
2351	/*
2352	* Macro identifier.
2353	*/
2354	if (!vbcppIsCIdentifierLeadChar(ch))
2355	return vbcppError(pThis, "Expected macro name after 'defined' operator");
2356
2357	size_t const offDefine = *poff - 1;
2358	while ((ch = vbcppMacroExpandGetCh(pExp, poff)) != ~(unsigned)0)
2359	if (!vbcppIsCIdentifierChar(ch))
2360	break;
2361	size_t const cchDefine = *poff - offDefine - 1;
2362
2363	/*
2364	* Check for closing parenthesis.
2365	*/
2366	if (fWithParenthesis)
2367	{
2368	while (RT_C_IS_SPACE(ch))
2369	ch = vbcppMacroExpandGetCh(pExp, poff);
2370	if (ch != ')')
2371	return vbcppError(pThis, "Expected closing parenthesis after macro name");
2372	}
2373
2374	/*
2375	* Do the job.
2376	*/
2377	const char *pszResult = vbcppMacroExists(pThis, &pExp->StrBuf.pszBuf[offDefine], cchDefine)
2378	? "1" : "0";
2379	RTEXITCODE rcExit = vbcppMacroExpandReplace(pThis, pExp, offStart, *poff - offStart, pszResult, 1);
2380	*poff = offStart + 1;
2381	return rcExit;
2382	}
2383
2384
2385	/**
2386	* Re-scan the expanded macro.
2387	*
2388	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE + msg.
2389	* @param pThis The C preprocessor instance.
2390	* @param pExp The expansion context.
2391	* @param enmMode The re-scan mode.
2392	* @param pcReplacements Where to return the number of replacements
2393	* performed. Optional.
2394	*/
2395	static RTEXITCODE vbcppMacroExpandReScan(PVBCPP pThis, PVBCPPMACROEXP pExp, VBCPPMACRORESCANMODE enmMode, size_t *pcReplacements)
2396	{
2397	RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
2398	size_t cReplacements = 0;
2399	size_t off = 0;
2400	unsigned ch;
2401	while ( off < pExp->StrBuf.cchBuf
2402	&& (ch = vbcppMacroExpandGetCh(pExp, &off)) != ~(unsigned)0)
2403	{
2404	/*
2405	* String litteral or character constant.
2406	*/
2407	if (ch == '\'' \|\| ch == '"')
2408	{
2409	unsigned const chEndQuote = ch;
2410	while ( off < pExp->StrBuf.cchBuf
2411	&& (ch = vbcppMacroExpandGetCh(pExp, &off)) != ~(unsigned)0)
2412	{
2413	if (ch == '\\')
2414	{
2415	ch = vbcppMacroExpandGetCh(pExp, &off);
2416	if (ch == ~(unsigned)0)
2417	break;
2418	}
2419	else if (ch == chEndQuote)
2420	break;
2421	}
2422	if (ch == ~(unsigned)0)
2423	return vbcppError(pThis, "Missing end quote (%c)", chEndQuote);
2424	}
2425	/*
2426	* Number constant.
2427	*/
2428	else if ( RT_C_IS_DIGIT(ch)
2429	\|\| ( ch == '.'
2430	&& off + 1 < pExp->StrBuf.cchBuf
2431	&& RT_C_IS_DIGIT(vbcppMacroExpandPeekCh(pExp, &off))
2432	)
2433	)
2434	{
2435	while ( off < pExp->StrBuf.cchBuf
2436	&& (ch = vbcppMacroExpandPeekCh(pExp, &off)) != ~(unsigned)0
2437	&& vbcppIsCIdentifierChar(ch) )
2438	vbcppMacroExpandGetCh(pExp, &off);
2439	}
2440	/*
2441	* Something that can be replaced?
2442	*/
2443	else if (vbcppIsCIdentifierLeadChar(ch))
2444	{
2445	size_t offDefine = off - 1;
2446	while ( off < pExp->StrBuf.cchBuf
2447	&& (ch = vbcppMacroExpandPeekCh(pExp, &off)) != ~(unsigned)0
2448	&& vbcppIsCIdentifierChar(ch) )
2449	vbcppMacroExpandGetCh(pExp, &off);
2450	size_t cchDefine = off - offDefine;
2451
2452	PVBCPPMACRO pMacro = vbcppMacroLookup(pThis, &pExp->StrBuf.pszBuf[offDefine], cchDefine);
2453	if ( pMacro
2454	&& ( !pMacro->fFunction
2455	\|\| vbcppMacroExpandLookForLeftParenthesis(pThis, pExp, &off)) )
2456	{
2457	cReplacements++;
2458	rcExit = vbcppMacroExpandIt(pThis, pExp, offDefine, pMacro, off);
2459	off = offDefine;
2460	}
2461	else
2462	{
2463	if ( !pMacro
2464	&& enmMode == kMacroReScanMode_Expression
2465	&& cchDefine == sizeof("defined") - 1
2466	&& !strncmp(&pExp->StrBuf.pszBuf[offDefine], "defined", cchDefine))
2467	{
2468	cReplacements++;
2469	rcExit = vbcppMacroExpandDefinedOperator(pThis, pExp, offDefine, &off);
2470	}
2471	else
2472	off = offDefine + cchDefine;
2473	}
2474	}
2475	else
2476	{
2477	Assert(RT_C_IS_SPACE(ch) \|\| RT_C_IS_PUNCT(ch));
2478	Assert(ch != '\r' && ch != '\n');
2479	}
2480	}
2481
2482	if (pcReplacements)
2483	*pcReplacements = cReplacements;
2484	return rcExit;
2485	}
2486
2487
2488	/**
2489	* Cleans up the expansion context.
2490	*
2491	* This involves clearing VBCPPMACRO::fExpanding and VBCPPMACRO::pUpExpanding,
2492	* and freeing the memory resources associated with the expansion context.
2493	*
2494	* @param pExp The expansion context.
2495	*/
2496	static void vbcppMacroExpandCleanup(PVBCPPMACROEXP pExp)
2497	{
2498	#if 0
2499	while (pExp->pMacroStack)
2500	{
2501	PVBCPPMACRO pMacro = pExp->pMacroStack;
2502	pExp->pMacroStack = pMacro->pUpExpanding;
2503
2504	pMacro->fExpanding = false;
2505	pMacro->pUpExpanding = NULL;
2506	}
2507	#endif
2508
2509	while (pExp->cArgs > 0)
2510	{
2511	RTMemFree(pExp->papszArgs[--pExp->cArgs]);
2512	pExp->papszArgs[pExp->cArgs] = NULL;
2513	}
2514
2515	RTMemFree(pExp->papszArgs);
2516	pExp->papszArgs = NULL;
2517
2518	vbcppStrBufDelete(&pExp->StrBuf);
2519	}
2520
2521
2522
2523	/**
2524	* Frees a define.
2525	*
2526	* @returns VINF_SUCCESS (used when called by RTStrSpaceDestroy)
2527	* @param pStr Pointer to the VBCPPMACRO::Core member.
2528	* @param pvUser Unused.
2529	*/
2530	static DECLCALLBACK(int) vbcppMacroFree(PRTSTRSPACECORE pStr, void *pvUser)
2531	{
2532	RTMemFree(pStr);
2533	NOREF(pvUser);
2534	return VINF_SUCCESS;
2535	}
2536
2537
2538	/**
2539	* Removes a define.
2540	*
2541	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE + msg.
2542	* @param pThis The C preprocessor instance.
2543	* @param pszDefine The define name, no argument list or anything.
2544	* @param cchDefine The length of the name. RTSTR_MAX is ok.
2545	* @param fExplicitUndef Explicit undefinition, that is, in a selective
2546	* preprocessing run it will evaluate to undefined.
2547	*/
2548	static RTEXITCODE vbcppMacroUndef(PVBCPP pThis, const char *pszDefine, size_t cchDefine, bool fExplicitUndef)
2549	{
2550	PRTSTRSPACECORE pHit = RTStrSpaceGetN(&pThis->StrSpace, pszDefine, cchDefine);
2551	if (pHit)
2552	{
2553	RTStrSpaceRemove(&pThis->StrSpace, pHit->pszString);
2554	vbcppMacroFree(pHit, NULL);
2555	}
2556
2557	if (fExplicitUndef)
2558	{
2559	if (cchDefine == RTSTR_MAX)
2560	cchDefine = strlen(pszDefine);
2561
2562	PRTSTRSPACECORE pStr = (PRTSTRSPACECORE)RTMemAlloc(sizeof(*pStr) + cchDefine + 1);
2563	if (!pStr)
2564	return vbcppError(pThis, "out of memory");
2565	char pszDst = (char )(pStr + 1);
2566	pStr->pszString = pszDst;
2567	memcpy(pszDst, pszDefine, cchDefine);
2568	pszDst[cchDefine] = '\0';
2569	if (!RTStrSpaceInsert(&pThis->UndefStrSpace, pStr))
2570	RTMemFree(pStr);
2571	}
2572
2573	return RTEXITCODE_SUCCESS;
2574	}
2575
2576
2577	/**
2578	* Inserts a define (rejecting and freeing it in some case).
2579	*
2580	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE + msg.
2581	* @param pThis The C preprocessor instance.
2582	* @param pMacro The define to insert.
2583	*/
2584	static RTEXITCODE vbcppMacroInsert(PVBCPP pThis, PVBCPPMACRO pMacro)
2585	{
2586	/*
2587	* Reject illegal macro names.
2588	*/
2589	if (!strcmp(pMacro->Core.pszString, "defined"))
2590	{
2591	RTEXITCODE rcExit = vbcppError(pThis, "Cannot use '%s' as a macro name", pMacro->Core.pszString);
2592	vbcppMacroFree(&pMacro->Core, NULL);
2593	return rcExit;
2594	}
2595
2596	/*
2597	* Ignore in source-file defines when doing selective preprocessing.
2598	*/
2599	if ( !pThis->fRespectSourceDefines
2600	&& !pMacro->fCmdLine)
2601	{
2602	/* Ignore*/
2603	vbcppMacroFree(&pMacro->Core, NULL);
2604	return RTEXITCODE_SUCCESS;
2605	}
2606
2607	/*
2608	* Insert it and update the lead character hint bitmap.
2609	*/
2610	if (RTStrSpaceInsert(&pThis->StrSpace, &pMacro->Core))
2611	VBCPP_BITMAP_SET(pThis->bmDefined, *pMacro->Core.pszString);
2612	else
2613	{
2614	/*
2615	* Duplicate. When doing selective D preprocessing, let the command
2616	* line take precendece.
2617	*/
2618	PVBCPPMACRO pOld = (PVBCPPMACRO)RTStrSpaceGet(&pThis->StrSpace, pMacro->Core.pszString); Assert(pOld);
2619	if ( pThis->fAllowRedefiningCmdLineDefines
2620	\|\| pMacro->fCmdLine == pOld->fCmdLine)
2621	{
2622	if (pMacro->fCmdLine)
2623	RTMsgWarning("Redefining '%s'", pMacro->Core.pszString);
2624
2625	RTStrSpaceRemove(&pThis->StrSpace, pOld->Core.pszString);
2626	vbcppMacroFree(&pOld->Core, NULL);
2627
2628	bool fRc = RTStrSpaceInsert(&pThis->StrSpace, &pMacro->Core);
2629	Assert(fRc); NOREF(fRc);
2630	}
2631	else
2632	{
2633	RTMsgWarning("Ignoring redefinition of '%s'", pMacro->Core.pszString);
2634	vbcppMacroFree(&pMacro->Core, NULL);
2635	}
2636	}
2637
2638	return RTEXITCODE_SUCCESS;
2639	}
2640
2641
2642	/**
2643	* Adds a define.
2644	*
2645	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE + msg.
2646	* @param pThis The C preprocessor instance.
2647	* @param pszDefine The define name, no parameter list.
2648	* @param cchDefine The length of the name.
2649	* @param pszParams The parameter list.
2650	* @param cchParams The length of the parameter list.
2651	* @param pszValue The value.
2652	* @param cchDefine The length of the value.
2653	* @param fCmdLine Set if originating on the command line.
2654	*/
2655	static RTEXITCODE vbcppMacroAddFn(PVBCPP pThis, const char *pszDefine, size_t cchDefine,
2656	const char *pszParams, size_t cchParams,
2657	const char *pszValue, size_t cchValue,
2658	bool fCmdLine)
2659
2660	{
2661	Assert(RTStrNLen(pszDefine, cchDefine) == cchDefine);
2662	Assert(RTStrNLen(pszParams, cchParams) == cchParams);
2663	Assert(RTStrNLen(pszValue, cchValue) == cchValue);
2664
2665	/*
2666	* Determin the number of arguments and how much space their names
2667	* requires. Performing syntax validation while parsing.
2668	*/
2669	uint32_t cchArgNames = 0;
2670	uint32_t cArgs = 0;
2671	for (size_t off = 0; off < cchParams; off++)
2672	{
2673	/* Skip blanks and maybe one comma. */
2674	bool fIgnoreComma = cArgs != 0;
2675	while (off < cchParams)
2676	{
2677	if (!RT_C_IS_SPACE(pszParams[off]))
2678	{
2679	if (pszParams[off] != ',' \|\| !fIgnoreComma)
2680	{
2681	if (vbcppIsCIdentifierLeadChar(pszParams[off]))
2682	break;
2683	/** @todo variadic macros. */
2684	return vbcppErrorPos(pThis, &pszParams[off], "Unexpected character");
2685	}
2686	fIgnoreComma = false;
2687	}
2688	off++;
2689	}
2690	if (off >= cchParams)
2691	break;
2692
2693	/* Found and argument. First character is already validated. */
2694	cArgs++;
2695	cchArgNames += 2;
2696	off++;
2697	while ( off < cchParams
2698	&& vbcppIsCIdentifierChar(pszParams[off]))
2699	off++, cchArgNames++;
2700	}
2701
2702	/*
2703	* Allocate a structure.
2704	*/
2705	size_t cbDef = RT_UOFFSETOF_DYN(VBCPPMACRO, szValue[cchValue + 1 + cchDefine + 1 + cchArgNames])
2706	+ sizeof(const char ) cArgs;
2707	cbDef = RT_ALIGN_Z(cbDef, sizeof(const char *));
2708	PVBCPPMACRO pMacro = (PVBCPPMACRO)RTMemAlloc(cbDef);
2709	if (!pMacro)
2710	return RTMsgErrorExit(RTEXITCODE_FAILURE, "out of memory");
2711
2712	char *pszDst = &pMacro->szValue[cchValue + 1];
2713	pMacro->Core.pszString = pszDst;
2714	memcpy(pszDst, pszDefine, cchDefine);
2715	pszDst += cchDefine;
2716	*pszDst++ = '\0';
2717	pMacro->fFunction = true;
2718	pMacro->fVarArg = false;
2719	pMacro->fCmdLine = fCmdLine;
2720	pMacro->fExpanding = false;
2721	pMacro->cArgs = cArgs;
2722	pMacro->papszArgs = (const char *)((uintptr_t)pMacro + cbDef - sizeof(const char ) * cArgs);
2723	VBCPP_BITMAP_EMPTY(pMacro->bmArgs);
2724	pMacro->cchValue = cchValue;
2725	memcpy(pMacro->szValue, pszValue, cchValue);
2726	pMacro->szValue[cchValue] = '\0';
2727
2728	/*
2729	* Set up the arguments.
2730	*/
2731	uint32_t iArg = 0;
2732	for (size_t off = 0; off < cchParams; off++)
2733	{
2734	/* Skip blanks and maybe one comma. */
2735	bool fIgnoreComma = cArgs != 0;
2736	while (off < cchParams)
2737	{
2738	if (!RT_C_IS_SPACE(pszParams[off]))
2739	{
2740	if (pszParams[off] != ',' \|\| !fIgnoreComma)
2741	break;
2742	fIgnoreComma = false;
2743	}
2744	off++;
2745	}
2746	if (off >= cchParams)
2747	break;
2748
2749	/* Found and argument. First character is already validated. */
2750	VBCPP_BITMAP_SET(pMacro->bmArgs, pszParams[off]);
2751	pMacro->papszArgs[iArg] = pszDst;
2752	do
2753	{
2754	*pszDst++ = pszParams[off++];
2755	} while ( off < cchParams
2756	&& vbcppIsCIdentifierChar(pszParams[off]));
2757	*pszDst++ = '\0';
2758	iArg++;
2759	}
2760	Assert((uintptr_t)pszDst <= (uintptr_t)pMacro->papszArgs);
2761
2762	return vbcppMacroInsert(pThis, pMacro);
2763	}
2764
2765
2766	/**
2767	* Adds a define.
2768	*
2769	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE + msg.
2770	* @param pThis The C preprocessor instance.
2771	* @param pszDefine The define name and optionally the argument
2772	* list.
2773	* @param cchDefine The length of the name. RTSTR_MAX is ok.
2774	* @param pszValue The value.
2775	* @param cchDefine The length of the value. RTSTR_MAX is ok.
2776	* @param fCmdLine Set if originating on the command line.
2777	*/
2778	static RTEXITCODE vbcppMacroAdd(PVBCPP pThis, const char *pszDefine, size_t cchDefine,
2779	const char *pszValue, size_t cchValue, bool fCmdLine)
2780	{
2781	/*
2782	* We need the lengths. Trim the input.
2783	*/
2784	if (cchDefine == RTSTR_MAX)
2785	cchDefine = strlen(pszDefine);
2786	while (cchDefine > 0 && RT_C_IS_SPACE(*pszDefine))
2787	pszDefine++, cchDefine--;
2788	while (cchDefine > 0 && RT_C_IS_SPACE(pszDefine[cchDefine - 1]))
2789	cchDefine--;
2790	if (!cchDefine)
2791	return vbcppErrorPos(pThis, pszDefine, "The define has no name");
2792
2793	if (cchValue == RTSTR_MAX)
2794	cchValue = strlen(pszValue);
2795	while (cchValue > 0 && RT_C_IS_SPACE(*pszValue))
2796	pszValue++, cchValue--;
2797	while (cchValue > 0 && RT_C_IS_SPACE(pszValue[cchValue - 1]))
2798	cchValue--;
2799
2800	/*
2801	* Arguments make the job a bit more annoying. Handle that elsewhere
2802	*/
2803	const char pszParams = (const char )memchr(pszDefine, '(', cchDefine);
2804	if (pszParams)
2805	{
2806	size_t cchParams = pszDefine + cchDefine - pszParams;
2807	cchDefine -= cchParams;
2808	if (!vbcppValidateCIdentifier(pThis, pszDefine, cchDefine))
2809	return RTEXITCODE_FAILURE;
2810	if (pszParams[cchParams - 1] != ')')
2811	return vbcppErrorPos(pThis, pszParams + cchParams - 1, "Missing closing parenthesis");
2812	pszParams++;
2813	cchParams -= 2;
2814	return vbcppMacroAddFn(pThis, pszDefine, cchDefine, pszParams, cchParams, pszValue, cchValue, fCmdLine);
2815	}
2816
2817	/*
2818	* Simple define, no arguments.
2819	*/
2820	if (!vbcppValidateCIdentifier(pThis, pszDefine, cchDefine))
2821	return RTEXITCODE_FAILURE;
2822
2823	PVBCPPMACRO pMacro = (PVBCPPMACRO)RTMemAlloc(RT_UOFFSETOF_DYN(VBCPPMACRO, szValue[cchValue + 1 + cchDefine + 1]));
2824	if (!pMacro)
2825	return RTMsgErrorExit(RTEXITCODE_FAILURE, "out of memory");
2826
2827	pMacro->Core.pszString = &pMacro->szValue[cchValue + 1];
2828	memcpy((char *)pMacro->Core.pszString, pszDefine, cchDefine);
2829	((char *)pMacro->Core.pszString)[cchDefine] = '\0';
2830	pMacro->fFunction = false;
2831	pMacro->fVarArg = false;
2832	pMacro->fCmdLine = fCmdLine;
2833	pMacro->fExpanding = false;
2834	pMacro->cArgs = 0;
2835	pMacro->papszArgs = NULL;
2836	VBCPP_BITMAP_EMPTY(pMacro->bmArgs);
2837	pMacro->cchValue = cchValue;
2838	memcpy(pMacro->szValue, pszValue, cchValue);
2839	pMacro->szValue[cchValue] = '\0';
2840
2841	return vbcppMacroInsert(pThis, pMacro);
2842	}
2843
2844
2845	/**
2846	* Tries to convert a define into an inline D constant.
2847	*
2848	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
2849	* @param pThis The C preprocessor instance.
2850	* @param pMacro The macro.
2851	*/
2852	static RTEXITCODE vbcppMacroTryConvertToInlineD(PVBCPP pThis, PVBCPPMACRO pMacro)
2853	{
2854	AssertReturn(pMacro, vbcppError(pThis, "Internal error"));
2855	if (pMacro->fFunction)
2856	return RTEXITCODE_SUCCESS;
2857
2858	/*
2859	* Do some simple macro resolving. (Mostly to make x86.h work.)
2860	*/
2861	const char *pszDefine = pMacro->Core.pszString;
2862	const char *pszValue = pMacro->szValue;
2863	size_t cchValue = pMacro->cchValue;
2864
2865	unsigned i = 0;
2866	PVBCPPMACRO pMacro2;
2867	while ( i < 10
2868	&& cchValue > 0
2869	&& vbcppIsCIdentifierLeadChar(*pszValue)
2870	&& (pMacro2 = vbcppMacroLookup(pThis, pszValue, cchValue)) != NULL
2871	&& !pMacro2->fFunction )
2872	{
2873	pszValue = pMacro2->szValue;
2874	cchValue = pMacro2->cchValue;
2875	i++;
2876	}
2877
2878	if (!pMacro->cchValue)
2879	return RTEXITCODE_SUCCESS;
2880
2881
2882	/*
2883	* A lone value?
2884	*/
2885	ssize_t cch = 0;
2886	uint64_t u64;
2887	char *pszNext;
2888	int rc = RTStrToUInt64Ex(pszValue, &pszNext, 0, &u64);
2889	if (RT_SUCCESS(rc))
2890	{
2891	if ( rc == VWRN_TRAILING_SPACES
2892	\|\| rc == VWRN_NEGATIVE_UNSIGNED
2893	\|\| rc == VWRN_NUMBER_TOO_BIG)
2894	return RTEXITCODE_SUCCESS;
2895	const char *pszType;
2896	if (rc == VWRN_TRAILING_CHARS)
2897	{
2898	if (!strcmp(pszNext, "u") \|\| !strcmp(pszNext, "U"))
2899	pszType = "uint32_t";
2900	else if (!strcmp(pszNext, "ul") \|\| !strcmp(pszNext, "UL"))
2901	pszType = "uintptr_t";
2902	else if (!strcmp(pszNext, "ull") \|\| !strcmp(pszNext, "ULL"))
2903	pszType = "uint64_t";
2904	else
2905	pszType = NULL;
2906	}
2907	else if (u64 <= UINT8_MAX)
2908	pszType = "uint8_t";
2909	else if (u64 <= UINT16_MAX)
2910	pszType = "uint16_t";
2911	else if (u64 <= UINT32_MAX)
2912	pszType = "uint32_t";
2913	else
2914	pszType = "uint64_t";
2915	if (!pszType)
2916	return RTEXITCODE_SUCCESS;
2917	cch = ScmStreamPrintf(&pThis->StrmOutput, "inline %s %s = %.*s;\n",
2918	pszType, pszDefine, pszNext - pszValue, pszValue);
2919	}
2920	/*
2921	* A value wrapped in a constant macro?
2922	*/
2923	else if ( (pszNext = (char *)strchr(pszValue, '(')) != NULL
2924	&& pszValue[cchValue - 1] == ')' )
2925	{
2926	size_t cchPrefix = pszNext - pszValue;
2927	size_t cchInnerValue = cchValue - cchPrefix - 2;
2928	const char *pchInnerValue = &pszValue[cchPrefix + 1];
2929	while (cchInnerValue > 0 && RT_C_IS_SPACE(*pchInnerValue))
2930	cchInnerValue--, pchInnerValue++;
2931	while (cchInnerValue > 0 && RT_C_IS_SPACE(pchInnerValue[cchInnerValue - 1]))
2932	cchInnerValue--;
2933	if (!cchInnerValue \|\| !RT_C_IS_XDIGIT(*pchInnerValue))
2934	return RTEXITCODE_SUCCESS;
2935
2936	rc = RTStrToUInt64Ex(pchInnerValue, &pszNext, 0, &u64);
2937	if ( RT_FAILURE(rc)
2938	\|\| rc == VWRN_TRAILING_SPACES
2939	\|\| rc == VWRN_NEGATIVE_UNSIGNED
2940	\|\| rc == VWRN_NUMBER_TOO_BIG)
2941	return RTEXITCODE_SUCCESS;
2942
2943	const char *pszType;
2944	#define MY_MATCH_STR(a_sz) (sizeof(a_sz) - 1 == cchPrefix && !strncmp(pszValue, a_sz, sizeof(a_sz) - 1))
2945	if (MY_MATCH_STR("UINT8_C"))
2946	pszType = "uint8_t";
2947	else if (MY_MATCH_STR("UINT16_C"))
2948	pszType = "uint16_t";
2949	else if (MY_MATCH_STR("UINT32_C"))
2950	pszType = "uint32_t";
2951	else if (MY_MATCH_STR("UINT64_C"))
2952	pszType = "uint64_t";
2953	else
2954	pszType = NULL;
2955	if (pszType)
2956	cch = ScmStreamPrintf(&pThis->StrmOutput, "inline %s %s = %.*s;\n",
2957	pszType, pszDefine, cchInnerValue, pchInnerValue);
2958	else if (MY_MATCH_STR("RT_BIT") \|\| MY_MATCH_STR("RT_BIT_32"))
2959	cch = ScmStreamPrintf(&pThis->StrmOutput, "inline uint32_t %s = 1U << %llu;\n",
2960	pszDefine, u64);
2961	else if (MY_MATCH_STR("RT_BIT_64"))
2962	cch = ScmStreamPrintf(&pThis->StrmOutput, "inline uint64_t %s = 1ULL << %llu;\n",
2963	pszDefine, u64);
2964	else
2965	return RTEXITCODE_SUCCESS;
2966	#undef MY_MATCH_STR
2967	}
2968	/* Dunno what this is... */
2969	else
2970	return RTEXITCODE_SUCCESS;
2971
2972	/*
2973	* Check for output error and clear the output suppression indicator.
2974	*/
2975	if (cch < 0)
2976	return vbcppError(pThis, "Output error");
2977
2978	pThis->fJustDroppedLine = false;
2979	return RTEXITCODE_SUCCESS;
2980	}
2981
2982
2983
2984	/**
2985	* Processes a abbreviated line number directive.
2986	*
2987	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
2988	* @param pThis The C preprocessor instance.
2989	* @param pStrmInput The input stream.
2990	* @param offStart The stream position where the directive
2991	* started (for pass thru).
2992	*/
2993	static RTEXITCODE vbcppDirectiveDefine(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
2994	{
2995	RT_NOREF_PV(offStart);
2996
2997	/*
2998	* Parse it.
2999	*/
3000	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
3001	if (rcExit == RTEXITCODE_SUCCESS)
3002	{
3003	size_t cchDefine;
3004	const char *pchDefine = ScmStreamCGetWord(pStrmInput, &cchDefine);
3005	if (pchDefine)
3006	{
3007	/* If it's a function style define, parse out the parameter list. */
3008	size_t cchParams = 0;
3009	const char *pchParams = NULL;
3010	unsigned ch = ScmStreamPeekCh(pStrmInput);
3011	if (ch == '(')
3012	{
3013	ScmStreamGetCh(pStrmInput);
3014	pchParams = ScmStreamGetCur(pStrmInput);
3015
3016	unsigned chPrev = ch;
3017	while ((ch = ScmStreamPeekCh(pStrmInput)) != ~(unsigned)0)
3018	{
3019	if (ch == '\r' \|\| ch == '\n')
3020	{
3021	if (chPrev != '\\')
3022	{
3023	rcExit = vbcppError(pThis, "Missing ')'");
3024	break;
3025	}
3026	ScmStreamSeekByLine(pStrmInput, ScmStreamTellLine(pStrmInput) + 1);
3027	}
3028	if (ch == ')')
3029	{
3030	cchParams = ScmStreamGetCur(pStrmInput) - pchParams;
3031	ScmStreamGetCh(pStrmInput);
3032	break;
3033	}
3034	ScmStreamGetCh(pStrmInput);
3035	}
3036	}
3037	/* The simple kind. */
3038	else if (!RT_C_IS_SPACE(ch) && ch != ~(unsigned)0)
3039	rcExit = vbcppError(pThis, "Expected whitespace after macro name");
3040
3041	/* Parse out the value. */
3042	if (rcExit == RTEXITCODE_SUCCESS)
3043	rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
3044	if (rcExit == RTEXITCODE_SUCCESS)
3045	{
3046	size_t offValue = ScmStreamTell(pStrmInput);
3047	const char *pchValue = ScmStreamGetCur(pStrmInput);
3048	unsigned chPrev = ch;
3049	while ((ch = ScmStreamPeekCh(pStrmInput)) != ~(unsigned)0)
3050	{
3051	if (ch == '\r' \|\| ch == '\n')
3052	{
3053	if (chPrev != '\\')
3054	break;
3055	ScmStreamSeekByLine(pStrmInput, ScmStreamTellLine(pStrmInput) + 1);
3056	}
3057	chPrev = ScmStreamGetCh(pStrmInput);
3058	}
3059	size_t cchValue = ScmStreamGetCur(pStrmInput) - pchValue;
3060
3061	/*
3062	* Execute.
3063	*/
3064	if (pchParams)
3065	rcExit = vbcppMacroAddFn(pThis, pchDefine, cchDefine, pchParams, cchParams, pchValue, cchValue, false);
3066	else
3067	rcExit = vbcppMacroAdd(pThis, pchDefine, cchDefine, pchValue, cchValue, false);
3068
3069	/*
3070	* Pass thru?
3071	*/
3072	if ( rcExit == RTEXITCODE_SUCCESS
3073	&& pThis->fPassThruDefines)
3074	{
3075	unsigned cchIndent = pThis->pCondStack ? pThis->pCondStack->iKeepLevel : 0;
3076	ssize_t cch;
3077	if (pchParams)
3078	cch = ScmStreamPrintf(&pThis->StrmOutput, "#%sdefine %.s(%.*s)",
3079	cchIndent, "", cchDefine, pchDefine, cchParams, pchParams);
3080	else
3081	cch = ScmStreamPrintf(&pThis->StrmOutput, "#%sdefine %.s",
3082	cchIndent, "", cchDefine, pchDefine);
3083	if (cch > 0)
3084	vbcppOutputComment(pThis, pStrmInput, offValue, cch, 1);
3085	else
3086	rcExit = vbcppError(pThis, "output error");
3087	}
3088	else if ( rcExit == RTEXITCODE_SUCCESS
3089	&& pThis->enmMode == kVBCppMode_SelectiveD)
3090	rcExit = vbcppMacroTryConvertToInlineD(pThis, vbcppMacroLookup(pThis, pchDefine, cchDefine));
3091	else
3092	pThis->fJustDroppedLine = true;
3093	}
3094	}
3095	}
3096	return rcExit;
3097	}
3098
3099
3100	/**
3101	* Processes a abbreviated line number directive.
3102	*
3103	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
3104	* @param pThis The C preprocessor instance.
3105	* @param pStrmInput The input stream.
3106	* @param offStart The stream position where the directive
3107	* started (for pass thru).
3108	*/
3109	static RTEXITCODE vbcppDirectiveUndef(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
3110	{
3111	RT_NOREF_PV(offStart);
3112
3113	/*
3114	* Parse it.
3115	*/
3116	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
3117	if (rcExit == RTEXITCODE_SUCCESS)
3118	{
3119	size_t cchDefine;
3120	const char *pchDefine = ScmStreamCGetWord(pStrmInput, &cchDefine);
3121	if (pchDefine)
3122	{
3123	size_t offMaybeComment = vbcppProcessSkipWhite(pStrmInput);
3124	rcExit = vbcppProcessSkipWhiteEscapedEolAndCommentsCheckEol(pThis, pStrmInput);
3125	if (rcExit == RTEXITCODE_SUCCESS)
3126	{
3127	/*
3128	* Take action.
3129	*/
3130	PVBCPPMACRO pMacro = vbcppMacroLookup(pThis, pchDefine, cchDefine);
3131	if ( pMacro
3132	&& pThis->fRespectSourceDefines
3133	&& ( !pMacro->fCmdLine
3134	\|\| pThis->fAllowRedefiningCmdLineDefines ) )
3135	{
3136	RTStrSpaceRemove(&pThis->StrSpace, pMacro->Core.pszString);
3137	vbcppMacroFree(&pMacro->Core, NULL);
3138	}
3139
3140	/*
3141	* Pass thru.
3142	*/
3143	if ( rcExit == RTEXITCODE_SUCCESS
3144	&& pThis->fPassThruDefines)
3145	{
3146	unsigned cchIndent = pThis->pCondStack ? pThis->pCondStack->iKeepLevel : 0;
3147	ssize_t cch = ScmStreamPrintf(&pThis->StrmOutput, "#%sundef %.s",
3148	cchIndent, "", cchDefine, pchDefine);
3149	if (cch > 0)
3150	vbcppOutputComment(pThis, pStrmInput, offMaybeComment, cch, 1);
3151	else
3152	rcExit = vbcppError(pThis, "output error");
3153	}
3154
3155	}
3156	}
3157	else
3158	rcExit = vbcppError(pThis, "Malformed #ifndef");
3159	}
3160	return rcExit;
3161
3162	}
3163
3164
3165
3166
3167
3168	/*
3169	*
3170	*
3171	* C O N D I T I O N A L S
3172	* C O N D I T I O N A L S
3173	* C O N D I T I O N A L S
3174	* C O N D I T I O N A L S
3175	* C O N D I T I O N A L S
3176	*
3177	*
3178	*/
3179
3180
3181	/**
3182	* Combines current stack result with the one being pushed.
3183	*
3184	* @returns Combined result.
3185	* @param enmEvalPush The result of the condition being pushed.
3186	* @param enmEvalStack The current stack result.
3187	*/
3188	static VBCPPEVAL vbcppCondCombine(VBCPPEVAL enmEvalPush, VBCPPEVAL enmEvalStack)
3189	{
3190	if (enmEvalStack == kVBCppEval_False)
3191	return kVBCppEval_False;
3192	return enmEvalPush;
3193	}
3194
3195
3196	/**
3197	* Pushes an conditional onto the stack.
3198	*
3199	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
3200	* @param pThis The C preprocessor instance.
3201	* @param pStrmInput The current input stream.
3202	* @param offStart Not currently used, using @a pchCondition and
3203	* @a cchCondition instead.
3204	* @param enmKind The kind of conditional.
3205	* @param enmResult The result of the evaluation.
3206	* @param pchCondition The raw condition.
3207	* @param cchCondition The length of @a pchCondition.
3208	*/
3209	static RTEXITCODE vbcppCondPush(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart,
3210	VBCPPCONDKIND enmKind, VBCPPEVAL enmResult,
3211	const char *pchCondition, size_t cchCondition)
3212	{
3213	RT_NOREF_PV(offStart); RT_NOREF_PV(pStrmInput);
3214
3215
3216	if (pThis->cCondStackDepth >= _64K)
3217	return vbcppError(pThis, "Too many nested #if/#ifdef/#ifndef statements");
3218
3219	/*
3220	* Allocate a new entry and push it.
3221	*/
3222	PVBCPPCOND pCond = (PVBCPPCOND)RTMemAlloc(sizeof(*pCond));
3223	if (!pCond)
3224	return vbcppError(pThis, "out of memory");
3225
3226	PVBCPPCOND pUp = pThis->pCondStack;
3227	pCond->enmKind = enmKind;
3228	pCond->enmResult = enmResult;
3229	pCond->enmStackResult = pUp ? vbcppCondCombine(enmResult, pUp->enmStackResult) : enmResult;
3230	pCond->fSeenElse = false;
3231	pCond->fElIfDecided = enmResult == kVBCppEval_True;
3232	pCond->iLevel = pThis->cCondStackDepth;
3233	pCond->iKeepLevel = (pUp ? pUp->iKeepLevel : 0) + enmResult == kVBCppEval_Undecided;
3234	pCond->pchCond = pchCondition;
3235	pCond->cchCond = cchCondition;
3236
3237	pCond->pUp = pThis->pCondStack;
3238	pThis->pCondStack = pCond;
3239	pThis->fIf0Mode = pCond->enmStackResult == kVBCppEval_False;
3240
3241	/*
3242	* Do pass thru.
3243	*/
3244	if ( !pThis->fIf0Mode
3245	&& enmResult == kVBCppEval_Undecided)
3246	{
3247	/** @todo this is stripping comments of \#ifdef and \#ifndef atm. */
3248	const char *pszDirective;
3249	switch (enmKind)
3250	{
3251	case kVBCppCondKind_If: pszDirective = "if"; break;
3252	case kVBCppCondKind_IfDef: pszDirective = "ifdef"; break;
3253	case kVBCppCondKind_IfNDef: pszDirective = "ifndef"; break;
3254	case kVBCppCondKind_ElIf: pszDirective = "elif"; break;
3255	default: AssertFailedReturn(RTEXITCODE_FAILURE);
3256	}
3257	ssize_t cch = ScmStreamPrintf(&pThis->StrmOutput, "#%s%s %.s",
3258	pCond->iKeepLevel - 1, "", pszDirective, cchCondition, pchCondition);
3259	if (cch < 0)
3260	return vbcppError(pThis, "Output error %Rrc", (int)cch);
3261	}
3262	else
3263	pThis->fJustDroppedLine = true;
3264
3265	return RTEXITCODE_SUCCESS;
3266	}
3267
3268
3269	/**
3270	* Recursively destroys the expression tree.
3271	*
3272	* @param pExpr The root of the expression tree to destroy.
3273	*/
3274	static void vbcppExprDestoryTree(PVBCPPEXPR pExpr)
3275	{
3276	if (!pExpr)
3277	return;
3278
3279	switch (pExpr->enmKind)
3280	{
3281	case kVBCppExprKind_Unary:
3282	vbcppExprDestoryTree(pExpr->u.Unary.pArg);
3283	break;
3284	case kVBCppExprKind_Binary:
3285	vbcppExprDestoryTree(pExpr->u.Binary.pLeft);
3286	vbcppExprDestoryTree(pExpr->u.Binary.pRight);
3287	break;
3288	case kVBCppExprKind_Ternary:
3289	vbcppExprDestoryTree(pExpr->u.Ternary.pExpr);
3290	vbcppExprDestoryTree(pExpr->u.Ternary.pExpr);
3291	vbcppExprDestoryTree(pExpr->u.Ternary.pFalse);
3292	break;
3293	case kVBCppExprKind_SignedValue:
3294	case kVBCppExprKind_UnsignedValue:
3295	break;
3296	default:
3297	AssertFailed();
3298	return;
3299	}
3300	RTMemFree(pExpr);
3301	}
3302
3303
3304	/**
3305	* Report error during expression parsing.
3306	*
3307	* @returns kExprRet_Error
3308	* @param pParser The parser instance.
3309	* @param pszMsg The error message.
3310	* @param ... Format arguments.
3311	*/
3312	static VBCPPEXPRRET vbcppExprParseError(PVBCPPEXPRPARSER pParser, const char *pszMsg, ...)
3313	{
3314	va_list va;
3315	va_start(va, pszMsg);
3316	vbcppErrorV(pParser->pThis, pszMsg, va);
3317	va_end(va);
3318	return kExprRet_Error;
3319	}
3320
3321
3322	/**
3323	* Skip white space.
3324	*
3325	* @param pParser The parser instance.
3326	*/
3327	static void vbcppExprParseSkipWhiteSpace(PVBCPPEXPRPARSER pParser)
3328	{
3329	while (RT_C_IS_SPACE(*pParser->pszCur))
3330	pParser->pszCur++;
3331	}
3332
3333
3334	/**
3335	* Allocate a new
3336	*
3337	* @returns Pointer to the node. NULL+msg on failure.
3338	* @param pParser The parser instance.
3339	*/
3340	static PVBCPPEXPR vbcppExprParseAllocNode(PVBCPPEXPRPARSER pParser)
3341	{
3342	PVBCPPEXPR pExpr = (PVBCPPEXPR)RTMemAllocZ(sizeof(*pExpr));
3343	if (!pExpr)
3344	vbcppExprParseError(pParser, "out of memory (expression node)");
3345	return pExpr;
3346	}
3347
3348
3349	/**
3350	* Looks for right parentheses and/or end of expression.
3351	*
3352	* @returns Expression status.
3353	* @retval kExprRet_Ok
3354	* @retval kExprRet_Error with msg.
3355	* @retval kExprRet_EndOfExpr
3356	* @param pParser The parser instance.
3357	*/
3358	static VBCPPEXPRRET vbcppExprParseMaybeRParenOrEoe(PVBCPPEXPRPARSER pParser)
3359	{
3360	Assert(!pParser->ppCur);
3361	for (;;)
3362	{
3363	vbcppExprParseSkipWhiteSpace(pParser);
3364	char ch = *pParser->pszCur;
3365	if (ch == '\0')
3366	return kExprRet_EndOfExpr;
3367	if (ch != ')')
3368	break;
3369	pParser->pszCur++;
3370
3371	PVBCPPEXPR pCur = pParser->pCur;
3372	while ( pCur
3373	&& ( pCur->enmKind != kVBCppExprKind_Unary
3374	\|\| pCur->u.Unary.enmOperator != kVBCppUnaryOp_Parenthesis))
3375	{
3376	switch (pCur->enmKind)
3377	{
3378	case kVBCppExprKind_SignedValue:
3379	case kVBCppExprKind_UnsignedValue:
3380	Assert(pCur->fComplete);
3381	break;
3382	case kVBCppExprKind_Unary:
3383	AssertReturn(pCur->u.Unary.pArg, vbcppExprParseError(pParser, "internal error"));
3384	pCur->fComplete = true;
3385	break;
3386	case kVBCppExprKind_Binary:
3387	AssertReturn(pCur->u.Binary.pLeft, vbcppExprParseError(pParser, "internal error"));
3388	AssertReturn(pCur->u.Binary.pRight, vbcppExprParseError(pParser, "internal error"));
3389	pCur->fComplete = true;
3390	break;
3391	case kVBCppExprKind_Ternary:
3392	#if 1 /** @todo Check out the ternary operator implementation. */
3393	return vbcppExprParseError(pParser, "The ternary operator is not implemented");
3394	#else
3395	Assert(pCur->u.Ternary.pExpr);
3396	if (!pCur->u.Ternary.pTrue)
3397	return vbcppExprParseError(pParser, "?!?!?");
3398	if (!pCur->u.Ternary.pFalse)
3399	return vbcppExprParseError(pParser, "?!?!?!?");
3400	pCur->fComplete = true;
3401	#endif
3402	break;
3403	default:
3404	return vbcppExprParseError(pParser, "Internal error (enmKind=%d)", pCur->enmKind);
3405	}
3406	pCur = pCur->pParent;
3407	}
3408	if (!pCur)
3409	return vbcppExprParseError(pParser, "Right parenthesis without a left one");
3410	pCur->fComplete = true;
3411
3412	while ( pCur->enmKind == kVBCppExprKind_Unary
3413	&& pCur->u.Unary.enmOperator != kVBCppUnaryOp_Parenthesis
3414	&& pCur->pParent)
3415	{
3416	AssertReturn(pCur->u.Unary.pArg, vbcppExprParseError(pParser, "internal error"));
3417	pCur->fComplete = true;
3418	pCur = pCur->pParent;
3419	}
3420	}
3421
3422	return kExprRet_Ok;
3423	}
3424
3425
3426	/**
3427	* Parses an binary operator.
3428	*
3429	* @returns Expression status.
3430	* @retval kExprRet_Ok
3431	* @retval kExprRet_Error with msg.
3432	* @param pParser The parser instance.
3433	*/
3434	static VBCPPEXPRRET vbcppExprParseBinaryOperator(PVBCPPEXPRPARSER pParser)
3435	{
3436	/*
3437	* Binary or ternary operator should follow now.
3438	*/
3439	VBCPPBINARYOP enmOp;
3440	char ch = *pParser->pszCur;
3441	switch (ch)
3442	{
3443	case '*':
3444	if (pParser->pszCur[1] == '=')
3445	return vbcppExprParseError(pParser, "The assignment by product operator is not valid in a preprocessor expression");
3446	enmOp = kVBCppBinary_Multiplication;
3447	break;
3448	case '/':
3449	if (pParser->pszCur[1] == '=')
3450	return vbcppExprParseError(pParser, "The assignment by quotient operator is not valid in a preprocessor expression");
3451	enmOp = kVBCppBinary_Division;
3452	break;
3453	case '%':
3454	if (pParser->pszCur[1] == '=')
3455	return vbcppExprParseError(pParser, "The assignment by remainder operator is not valid in a preprocessor expression");
3456	enmOp = kVBCppBinary_Modulo;
3457	break;
3458	case '+':
3459	if (pParser->pszCur[1] == '=')
3460	return vbcppExprParseError(pParser, "The assignment by sum operator is not valid in a preprocessor expression");
3461	enmOp = kVBCppBinary_Addition;
3462	break;
3463	case '-':
3464	if (pParser->pszCur[1] == '=')
3465	return vbcppExprParseError(pParser, "The assignment by difference operator is not valid in a preprocessor expression");
3466	enmOp = kVBCppBinary_Subtraction;
3467	break;
3468	case '<':
3469	enmOp = kVBCppBinary_LessThan;
3470	if (pParser->pszCur[1] == '=')
3471	{
3472	pParser->pszCur++;
3473	enmOp = kVBCppBinary_LessThanOrEqual;
3474	}
3475	else if (pParser->pszCur[1] == '<')
3476	{
3477	pParser->pszCur++;
3478	if (pParser->pszCur[1] == '=')
3479	return vbcppExprParseError(pParser, "The assignment by bitwise left shift operator is not valid in a preprocessor expression");
3480	enmOp = kVBCppBinary_LeftShift;
3481	}
3482	break;
3483	case '>':
3484	enmOp = kVBCppBinary_GreaterThan;
3485	if (pParser->pszCur[1] == '=')
3486	{
3487	pParser->pszCur++;
3488	enmOp = kVBCppBinary_GreaterThanOrEqual;
3489	}
3490	else if (pParser->pszCur[1] == '<')
3491	{
3492	pParser->pszCur++;
3493	if (pParser->pszCur[1] == '=')
3494	return vbcppExprParseError(pParser, "The assignment by bitwise right shift operator is not valid in a preprocessor expression");
3495	enmOp = kVBCppBinary_LeftShift;
3496	}
3497	break;
3498	case '=':
3499	if (pParser->pszCur[1] != '=')
3500	return vbcppExprParseError(pParser, "The assignment operator is not valid in a preprocessor expression");
3501	pParser->pszCur++;
3502	enmOp = kVBCppBinary_EqualTo;
3503	break;
3504
3505	case '!':
3506	if (pParser->pszCur[1] != '=')
3507	return vbcppExprParseError(pParser, "Expected binary operator, found the unary operator logical NOT");
3508	pParser->pszCur++;
3509	enmOp = kVBCppBinary_NotEqualTo;
3510	break;
3511
3512	case '&':
3513	if (pParser->pszCur[1] == '=')
3514	return vbcppExprParseError(pParser, "The assignment by bitwise AND operator is not valid in a preprocessor expression");
3515	if (pParser->pszCur[1] == '&')
3516	{
3517	pParser->pszCur++;
3518	enmOp = kVBCppBinary_LogicalAnd;
3519	}
3520	else
3521	enmOp = kVBCppBinary_BitwiseAnd;
3522	break;
3523	case '^':
3524	if (pParser->pszCur[1] == '=')
3525	return vbcppExprParseError(pParser, "The assignment by bitwise XOR operator is not valid in a preprocessor expression");
3526	enmOp = kVBCppBinary_BitwiseXor;
3527	break;
3528	case '\|':
3529	if (pParser->pszCur[1] == '=')
3530	return vbcppExprParseError(pParser, "The assignment by bitwise AND operator is not valid in a preprocessor expression");
3531	if (pParser->pszCur[1] == '\|')
3532	{
3533	pParser->pszCur++;
3534	enmOp = kVBCppBinary_LogicalOr;
3535	}
3536	else
3537	enmOp = kVBCppBinary_BitwiseOr;
3538	break;
3539	case '~':
3540	return vbcppExprParseError(pParser, "Expected binary operator, found the unary operator bitwise NOT");
3541
3542	case ':':
3543	case '?':
3544	return vbcppExprParseError(pParser, "The ternary operator is not yet implemented");
3545
3546	default:
3547	return vbcppExprParseError(pParser, "Expected binary operator, found '%.20s'", pParser->pszCur);
3548	}
3549	pParser->pszCur++;
3550
3551	/*
3552	* Create a binary operator node.
3553	*/
3554	PVBCPPEXPR pExpr = vbcppExprParseAllocNode(pParser);
3555	if (!pExpr)
3556	return kExprRet_Error;
3557	pExpr->fComplete = true;
3558	pExpr->enmKind = kVBCppExprKind_Binary;
3559	pExpr->u.Binary.enmOperator = enmOp;
3560	pExpr->u.Binary.pLeft = NULL;
3561	pExpr->u.Binary.pRight = NULL;
3562
3563	/*
3564	* Back up the tree until we find our spot.
3565	*/
3566	PVBCPPEXPR *ppPlace = NULL;
3567	PVBCPPEXPR pChild = NULL;
3568	PVBCPPEXPR pParent = pParser->pCur;
3569	while (pParent)
3570	{
3571	if (pParent->enmKind == kVBCppExprKind_Unary)
3572	{
3573	if (pParent->u.Unary.enmOperator == kVBCppUnaryOp_Parenthesis)
3574	{
3575	ppPlace = &pParent->u.Unary.pArg;
3576	break;
3577	}
3578	AssertReturn(pParent->u.Unary.pArg, vbcppExprParseError(pParser, "internal error"));
3579	pParent->fComplete = true;
3580	}
3581	else if (pParent->enmKind == kVBCppExprKind_Binary)
3582	{
3583	AssertReturn(pParent->u.Binary.pLeft, vbcppExprParseError(pParser, "internal error"));
3584	AssertReturn(pParent->u.Binary.pRight, vbcppExprParseError(pParser, "internal error"));
3585	if ((pParent->u.Binary.enmOperator & VBCPPOP_PRECEDENCE_MASK) >= (enmOp & VBCPPOP_PRECEDENCE_MASK))
3586	{
3587	AssertReturn(pChild, vbcppExprParseError(pParser, "internal error"));
3588
3589	if (pParent->u.Binary.pRight == pChild)
3590	ppPlace = &pParent->u.Binary.pRight;
3591	else
3592	ppPlace = &pParent->u.Binary.pLeft;
3593	AssertReturn(*ppPlace == pChild, vbcppExprParseError(pParser, "internal error"));
3594	break;
3595	}
3596	pParent->fComplete = true;
3597	}
3598	else if (pParent->enmKind == kVBCppExprKind_Ternary)
3599	{
3600	return vbcppExprParseError(pParser, "The ternary operator is not implemented");
3601	}
3602	else
3603	AssertReturn( pParent->enmKind == kVBCppExprKind_SignedValue
3604	\|\| pParent->enmKind == kVBCppExprKind_UnsignedValue,
3605	vbcppExprParseError(pParser, "internal error"));
3606
3607	/* Up on level */
3608	pChild = pParent;
3609	pParent = pParent->pParent;
3610	}
3611
3612	/*
3613	* Do the rotation.
3614	*/
3615	Assert(pChild);
3616	Assert(pChild->pParent == pParent);
3617	pChild->pParent = pExpr;
3618
3619	pExpr->u.Binary.pLeft = pChild;
3620	pExpr->pParent = pParent;
3621
3622	if (!pParent)
3623	pParser->pRoot = pExpr;
3624	else
3625	*ppPlace = pExpr;
3626
3627	pParser->ppCur = &pExpr->u.Binary.pRight;
3628	pParser->pCur = pExpr;
3629
3630	return kExprRet_Ok;
3631	}
3632
3633
3634	/**
3635	* Deals with right paretheses or/and end of expression, looks for binary
3636	* operators.
3637	*
3638	* @returns Expression status.
3639	* @retval kExprRet_Ok if binary operator was found processed.
3640	* @retval kExprRet_Error with msg.
3641	* @retval kExprRet_EndOfExpr
3642	* @param pParser The parser instance.
3643	*/
3644	static VBCPPEXPRRET vbcppExprParseBinaryOrEoeOrRparen(PVBCPPEXPRPARSER pParser)
3645	{
3646	VBCPPEXPRRET enmRet = vbcppExprParseMaybeRParenOrEoe(pParser);
3647	if (enmRet != kExprRet_Ok)
3648	return enmRet;
3649	return vbcppExprParseBinaryOperator(pParser);
3650	}
3651
3652
3653	/**
3654	* Parses an identifier in the expression, replacing it by 0.
3655	*
3656	* All known identifiers has already been replaced by their macro values, so
3657	* what's left are unknown macros. These are replaced by 0.
3658	*
3659	* @returns Expression status.
3660	* @retval kExprRet_Value
3661	* @retval kExprRet_Error with msg.
3662	* @param pParser The parser instance.
3663	*/
3664	static VBCPPEXPRRET vbcppExprParseIdentifier(PVBCPPEXPRPARSER pParser)
3665	{
3666	/** @todo don't increment if it's an actively undefined macro. Need to revise
3667	* the expression related code wrt selective preprocessing. */
3668	pParser->cUndefined++;
3669
3670	/* Find the end. */
3671	const char *pszMacro = pParser->pszCur;
3672	const char *pszNext = pszMacro + 1;
3673	while (vbcppIsCIdentifierChar(*pszNext))
3674	pszNext++;
3675	size_t cchMacro = pszNext - pszMacro;
3676
3677	/* Create a signed value node. */
3678	PVBCPPEXPR pExpr = vbcppExprParseAllocNode(pParser);
3679	if (!pExpr)
3680	return kExprRet_Error;
3681	pExpr->fComplete = true;
3682	pExpr->enmKind = kVBCppExprKind_UnsignedValue;
3683	pExpr->u.UnsignedValue.u64 = 0;
3684
3685	/* Link it. */
3686	pExpr->pParent = pParser->pCur;
3687	pParser->pCur = pExpr;
3688	*pParser->ppCur = pExpr;
3689	pParser->ppCur = NULL;
3690
3691	/* Skip spaces and check for parenthesis. */
3692	pParser->pszCur = pszNext;
3693	vbcppExprParseSkipWhiteSpace(pParser);
3694	if (*pParser->pszCur == '(')
3695	return vbcppExprParseError(pParser, "Unknown unary operator '%.*s'", cchMacro, pszMacro);
3696
3697	return kExprRet_Value;
3698	}
3699
3700
3701	/**
3702	* Parses an numeric constant in the expression.
3703	*
3704	* @returns Expression status.
3705	* @retval kExprRet_Value
3706	* @retval kExprRet_Error with msg.
3707	* @param pParser The parser instance.
3708	*/
3709	static VBCPPEXPRRET vbcppExprParseNumber(PVBCPPEXPRPARSER pParser)
3710	{
3711	bool fSigned;
3712	char *pszNext;
3713	uint64_t u64;
3714	char ch = *pParser->pszCur++;
3715	char ch2 = *pParser->pszCur;
3716	if ( ch == '0'
3717	&& (ch == 'x' \|\| ch == 'X'))
3718	{
3719	ch2 = *++pParser->pszCur;
3720	if (!RT_C_IS_XDIGIT(ch2))
3721	return vbcppExprParseError(pParser, "Expected hex digit following '0x'");
3722	int rc = RTStrToUInt64Ex(pParser->pszCur, &pszNext, 16, &u64);
3723	if ( RT_FAILURE(rc)
3724	\|\| rc == VWRN_NUMBER_TOO_BIG)
3725	return vbcppExprParseError(pParser, "Invalid hex value '%.20s...' (%Rrc)", pParser->pszCur, rc);
3726	fSigned = false;
3727	}
3728	else if (ch == '0')
3729	{
3730	int rc = RTStrToUInt64Ex(pParser->pszCur - 1, &pszNext, 8, &u64);
3731	if ( RT_FAILURE(rc)
3732	\|\| rc == VWRN_NUMBER_TOO_BIG)
3733	return vbcppExprParseError(pParser, "Invalid octal value '%.20s...' (%Rrc)", pParser->pszCur, rc);
3734	fSigned = u64 > (uint64_t)INT64_MAX ? false : true;
3735	}
3736	else
3737	{
3738	int rc = RTStrToUInt64Ex(pParser->pszCur - 1, &pszNext, 10, &u64);
3739	if ( RT_FAILURE(rc)
3740	\|\| rc == VWRN_NUMBER_TOO_BIG)
3741	return vbcppExprParseError(pParser, "Invalid decimal value '%.20s...' (%Rrc)", pParser->pszCur, rc);
3742	fSigned = u64 > (uint64_t)INT64_MAX ? false : true;
3743	}
3744
3745	/* suffix. */
3746	if (vbcppIsCIdentifierLeadChar(*pszNext))
3747	{
3748	size_t cchSuffix = 1;
3749	while (vbcppIsCIdentifierLeadChar(pszNext[cchSuffix]))
3750	cchSuffix++;
3751
3752	if (cchSuffix == '1' && (pszNext == 'u' \|\| pszNext == 'U'))
3753	fSigned = false;
3754	else if ( cchSuffix == '1'
3755	&& (pszNext == 'l' \|\| pszNext == 'L'))
3756	fSigned = true;
3757	else if ( cchSuffix == '2'
3758	&& (!strncmp(pszNext, "ul", 2) \|\| !strncmp(pszNext, "UL", 2)))
3759	fSigned = false;
3760	else if ( cchSuffix == '2'
3761	&& (!strncmp(pszNext, "ll", 2) \|\| !strncmp(pszNext, "LL", 2)))
3762	fSigned = true;
3763	else if ( cchSuffix == '3'
3764	&& (!strncmp(pszNext, "ull", 3) \|\| !strncmp(pszNext, "ULL", 3)))
3765	fSigned = false;
3766	else
3767	return vbcppExprParseError(pParser, "Invalid number suffix '%.*s'", cchSuffix, pszNext);
3768
3769	pszNext += cchSuffix;
3770	}
3771	pParser->pszCur = pszNext;
3772
3773	/* Create a signed value node. */
3774	PVBCPPEXPR pExpr = vbcppExprParseAllocNode(pParser);
3775	if (!pExpr)
3776	return kExprRet_Error;
3777	pExpr->fComplete = true;
3778	if (fSigned)
3779	{
3780	pExpr->enmKind = kVBCppExprKind_SignedValue;
3781	pExpr->u.SignedValue.s64 = (int64_t)u64;
3782	}
3783	else
3784	{
3785	pExpr->enmKind = kVBCppExprKind_UnsignedValue;
3786	pExpr->u.UnsignedValue.u64 = u64;
3787	}
3788
3789	/* Link it. */
3790	pExpr->pParent = pParser->pCur;
3791	pParser->pCur = pExpr;
3792	*pParser->ppCur = pExpr;
3793	pParser->ppCur = NULL;
3794
3795	return kExprRet_Value;
3796	}
3797
3798
3799	/**
3800	* Parses an character constant in the expression.
3801	*
3802	* @returns Expression status.
3803	* @retval kExprRet_Value
3804	* @retval kExprRet_Error with msg.
3805	* @param pParser The parser instance.
3806	*/
3807	static VBCPPEXPRRET vbcppExprParseCharacterConstant(PVBCPPEXPRPARSER pParser)
3808	{
3809	Assert(*pParser->pszCur == '\'');
3810	pParser->pszCur++;
3811	char ch2 = *pParser->pszCur++;
3812	if (ch2 == '\'')
3813	return vbcppExprParseError(pParser, "Empty character constant");
3814	int64_t s64;
3815	if (ch2 == '\\')
3816	{
3817	ch2 = *pParser->pszCur++;
3818	switch (ch2)
3819	{
3820	case '0': s64 = 0x00; break;
3821	case 'n': s64 = 0x0d; break;
3822	case 'r': s64 = 0x0a; break;
3823	case 't': s64 = 0x09; break;
3824	default:
3825	return vbcppExprParseError(pParser, "Escape character '%c' is not implemented", ch2);
3826	}
3827	}
3828	else
3829	s64 = ch2;
3830	if (*pParser->pszCur != '\'')
3831	return vbcppExprParseError(pParser, "Character constant contains more than one character");
3832
3833	/* Create a signed value node. */
3834	PVBCPPEXPR pExpr = vbcppExprParseAllocNode(pParser);
3835	if (!pExpr)
3836	return kExprRet_Error;
3837	pExpr->fComplete = true;
3838	pExpr->enmKind = kVBCppExprKind_SignedValue;
3839	pExpr->u.SignedValue.s64 = s64;
3840
3841	/* Link it. */
3842	pExpr->pParent = pParser->pCur;
3843	pParser->pCur = pExpr;
3844	*pParser->ppCur = pExpr;
3845	pParser->ppCur = NULL;
3846
3847	return kExprRet_Value;
3848	}
3849
3850
3851	/**
3852	* Parses a unary operator or a value.
3853	*
3854	* @returns Expression status.
3855	* @retval kExprRet_Value if value was found and processed.
3856	* @retval kExprRet_UnaryOperator if an unary operator was found and processed.
3857	* @retval kExprRet_Error with msg.
3858	* @param pParser The parser instance.
3859	*/
3860	static VBCPPEXPRRET vbcppExprParseUnaryOrValue(PVBCPPEXPRPARSER pParser)
3861	{
3862	vbcppExprParseSkipWhiteSpace(pParser);
3863	char ch = *pParser->pszCur;
3864	if (ch == '\0')
3865	return vbcppExprParseError(pParser, "Premature end of expression");
3866
3867	/*
3868	* Value?
3869	*/
3870	if (ch == '\'')
3871	return vbcppExprParseCharacterConstant(pParser);
3872	if (RT_C_IS_DIGIT(ch))
3873	return vbcppExprParseNumber(pParser);
3874	if (ch == '"')
3875	return vbcppExprParseError(pParser, "String litteral");
3876	if (vbcppIsCIdentifierLeadChar(ch))
3877	return vbcppExprParseIdentifier(pParser);
3878
3879	/*
3880	* Operator?
3881	*/
3882	VBCPPUNARYOP enmOperator;
3883	if (ch == '+')
3884	{
3885	enmOperator = kVBCppUnaryOp_Pluss;
3886	if (pParser->pszCur[1] == '+')
3887	return vbcppExprParseError(pParser, "The prefix increment operator is not valid in a preprocessor expression");
3888	}
3889	else if (ch == '-')
3890	{
3891	enmOperator = kVBCppUnaryOp_Minus;
3892	if (pParser->pszCur[1] == '-')
3893	return vbcppExprParseError(pParser, "The prefix decrement operator is not valid in a preprocessor expression");
3894	}
3895	else if (ch == '!')
3896	enmOperator = kVBCppUnaryOp_LogicalNot;
3897	else if (ch == '~')
3898	enmOperator = kVBCppUnaryOp_BitwiseNot;
3899	else if (ch == '(')
3900	enmOperator = kVBCppUnaryOp_Parenthesis;
3901	else
3902	return vbcppExprParseError(pParser, "Unknown token '%.*s'", 32, pParser->pszCur - 1);
3903	pParser->pszCur++;
3904
3905	/* Create an operator node. */
3906	PVBCPPEXPR pExpr = vbcppExprParseAllocNode(pParser);
3907	if (!pExpr)
3908	return kExprRet_Error;
3909	pExpr->fComplete = false;
3910	pExpr->enmKind = kVBCppExprKind_Unary;
3911	pExpr->u.Unary.enmOperator = enmOperator;
3912	pExpr->u.Unary.pArg = NULL;
3913
3914	/* Link it into the tree. */
3915	pExpr->pParent = pParser->pCur;
3916	pParser->pCur = pExpr;
3917	*pParser->ppCur = pExpr;
3918	pParser->ppCur = &pExpr->u.Unary.pArg;
3919
3920	return kExprRet_UnaryOperator;
3921	}
3922
3923
3924	/**
3925	* Parses an expanded preprocessor expression.
3926	*
3927	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
3928	* @param pThis The C preprocessor instance.
3929	* @param pszExpr The expression to parse.
3930	* @param cchExpr The length of the expression in case we need it.
3931	* @param ppExprTree Where to return the parse tree.
3932	* @param pcUndefined Where to return the number of unknown undefined
3933	* macros. Optional.
3934	*/
3935	static RTEXITCODE vbcppExprParse(PVBCPP pThis, char pszExpr, size_t cchExpr, PVBCPPEXPR ppExprTree, size_t *pcUndefined)
3936	{
3937	RTEXITCODE rcExit = RTEXITCODE_FAILURE;
3938	NOREF(cchExpr);
3939
3940	/*
3941	* Initialize the parser context structure.
3942	*/
3943	VBCPPEXPRPARSER Parser;
3944	Parser.pszCur = pszExpr;
3945	Parser.pRoot = NULL;
3946	Parser.pCur = NULL;
3947	Parser.ppCur = &Parser.pRoot;
3948	Parser.pszExpr = pszExpr;
3949	Parser.cUndefined = 0;
3950	Parser.pThis = pThis;
3951
3952	/*
3953	* Do the parsing.
3954	*/
3955	VBCPPEXPRRET enmRet;
3956	for (;;)
3957	{
3958	/*
3959	* Eat unary operators until we hit a value.
3960	*/
3961	do
3962	enmRet = vbcppExprParseUnaryOrValue(&Parser);
3963	while (enmRet == kExprRet_UnaryOperator);
3964	if (enmRet == kExprRet_Error)
3965	break;
3966	AssertBreakStmt(enmRet == kExprRet_Value, enmRet = vbcppExprParseError(&Parser, "Expected value (enmRet=%d)", enmRet));
3967
3968	/*
3969	* Non-unary operator, right parenthesis or end of expression is up next.
3970	*/
3971	enmRet = vbcppExprParseBinaryOrEoeOrRparen(&Parser);
3972	if (enmRet == kExprRet_Error)
3973	break;
3974	if (enmRet == kExprRet_EndOfExpr)
3975	{
3976	/** @todo check if there are any open parentheses. */
3977	rcExit = RTEXITCODE_SUCCESS;
3978	break;
3979	}
3980	AssertBreakStmt(enmRet == kExprRet_Ok, enmRet = vbcppExprParseError(&Parser, "Expected value (enmRet=%d)", enmRet));
3981	}
3982
3983	if (rcExit != RTEXITCODE_SUCCESS)
3984	{
3985	vbcppExprDestoryTree(Parser.pRoot);
3986	return rcExit;
3987	}
3988
3989	if (pcUndefined)
3990	*pcUndefined = Parser.cUndefined;
3991	*ppExprTree = Parser.pRoot;
3992	return rcExit;
3993	}
3994
3995
3996	/**
3997	* Checks if an expression value value is evaluates to @c true or @c false.
3998	*
3999	* @returns @c true or @c false.
4000	* @param pExpr The value expression.
4001	*/
4002	static bool vbcppExprIsExprTrue(PVBCPPEXPR pExpr)
4003	{
4004	Assert(pExpr->enmKind == kVBCppExprKind_SignedValue \|\| pExpr->enmKind == kVBCppExprKind_UnsignedValue);
4005
4006	return pExpr->enmKind == kVBCppExprKind_SignedValue
4007	? pExpr->u.SignedValue.s64 != 0
4008	: pExpr->u.UnsignedValue.u64 != 0;
4009	}
4010
4011
4012	/**
4013	* Evalutes a parse (sub-)tree.
4014	*
4015	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4016	* @param pThis The C preprocessor instance.
4017	* @param pRoot The root of the parse (sub-)tree.
4018	* @param pResult Where to store the result value.
4019	*/
4020	static RTEXITCODE vbcppExprEvaluteTree(PVBCPP pThis, PVBCPPEXPR pRoot, PVBCPPEXPR pResult)
4021	{
4022	RTEXITCODE rcExit;
4023	switch (pRoot->enmKind)
4024	{
4025	case kVBCppExprKind_SignedValue:
4026	pResult->enmKind = kVBCppExprKind_SignedValue;
4027	pResult->u.SignedValue.s64 = pRoot->u.SignedValue.s64;
4028	return RTEXITCODE_SUCCESS;
4029
4030	case kVBCppExprKind_UnsignedValue:
4031	pResult->enmKind = kVBCppExprKind_UnsignedValue;
4032	pResult->u.UnsignedValue.u64 = pRoot->u.UnsignedValue.u64;
4033	return RTEXITCODE_SUCCESS;
4034
4035	case kVBCppExprKind_Unary:
4036	rcExit = vbcppExprEvaluteTree(pThis, pRoot->u.Unary.pArg, pResult);
4037	if (rcExit != RTEXITCODE_SUCCESS)
4038	return rcExit;
4039
4040	/* Apply the unary operator to the value */
4041	switch (pRoot->u.Unary.enmOperator)
4042	{
4043	case kVBCppUnaryOp_Minus:
4044	if (pResult->enmKind == kVBCppExprKind_SignedValue)
4045	pResult->u.SignedValue.s64 = -pResult->u.SignedValue.s64;
4046	else
4047	pResult->u.UnsignedValue.u64 = (uint64_t)-(int64_t)pResult->u.UnsignedValue.u64;
4048	break;
4049
4050	case kVBCppUnaryOp_LogicalNot:
4051	if (pResult->enmKind == kVBCppExprKind_SignedValue)
4052	pResult->u.SignedValue.s64 = !pResult->u.SignedValue.s64;
4053	else
4054	pResult->u.UnsignedValue.u64 = !pResult->u.UnsignedValue.u64;
4055	break;
4056
4057	case kVBCppUnaryOp_BitwiseNot:
4058	if (pResult->enmKind == kVBCppExprKind_SignedValue)
4059	pResult->u.SignedValue.s64 = ~pResult->u.SignedValue.s64;
4060	else
4061	pResult->u.UnsignedValue.u64 = ~pResult->u.UnsignedValue.u64;
4062	break;
4063
4064	case kVBCppUnaryOp_Pluss:
4065	case kVBCppUnaryOp_Parenthesis:
4066	/* do nothing. */
4067	break;
4068
4069	default:
4070	return vbcppError(pThis, "Internal error: u.Unary.enmOperator=%d", pRoot->u.Unary.enmOperator);
4071	}
4072	return RTEXITCODE_SUCCESS;
4073
4074	case kVBCppExprKind_Binary:
4075	{
4076	/* Always evalute the left side. */
4077	rcExit = vbcppExprEvaluteTree(pThis, pRoot->u.Binary.pLeft, pResult);
4078	if (rcExit != RTEXITCODE_SUCCESS)
4079	return rcExit;
4080
4081	/* If logical AND or OR we can sometimes skip evaluting the right side. */
4082	if ( pRoot->u.Binary.enmOperator == kVBCppBinary_LogicalAnd
4083	&& !vbcppExprIsExprTrue(pResult))
4084	return RTEXITCODE_SUCCESS;
4085
4086	if ( pRoot->u.Binary.enmOperator == kVBCppBinary_LogicalOr
4087	&& vbcppExprIsExprTrue(pResult))
4088	return RTEXITCODE_SUCCESS;
4089
4090	/* Evalute the right side. */
4091	VBCPPEXPR Result2;
4092	rcExit = vbcppExprEvaluteTree(pThis, pRoot->u.Binary.pRight, &Result2);
4093	if (rcExit != RTEXITCODE_SUCCESS)
4094	return rcExit;
4095
4096	/* If one of them is unsigned, promote the other to unsigned as well. */
4097	if ( pResult->enmKind == kVBCppExprKind_UnsignedValue
4098	&& Result2.enmKind == kVBCppExprKind_SignedValue)
4099	{
4100	Result2.enmKind = kVBCppExprKind_UnsignedValue;
4101	Result2.u.UnsignedValue.u64 = Result2.u.SignedValue.s64;
4102	}
4103	else if ( pResult->enmKind == kVBCppExprKind_SignedValue
4104	&& Result2.enmKind == kVBCppExprKind_UnsignedValue)
4105	{
4106	pResult->enmKind = kVBCppExprKind_UnsignedValue;
4107	pResult->u.UnsignedValue.u64 = pResult->u.SignedValue.s64;
4108	}
4109
4110	/* Perform the operation. */
4111	if (pResult->enmKind == kVBCppExprKind_UnsignedValue)
4112	{
4113	switch (pRoot->u.Binary.enmOperator)
4114	{
4115	case kVBCppBinary_Multiplication:
4116	pResult->u.UnsignedValue.u64 *= Result2.u.UnsignedValue.u64;
4117	break;
4118	case kVBCppBinary_Division:
4119	if (!Result2.u.UnsignedValue.u64)
4120	return vbcppError(pThis, "Divide by zero");
4121	pResult->u.UnsignedValue.u64 /= Result2.u.UnsignedValue.u64;
4122	break;
4123	case kVBCppBinary_Modulo:
4124	if (!Result2.u.UnsignedValue.u64)
4125	return vbcppError(pThis, "Divide by zero");
4126	pResult->u.UnsignedValue.u64 %= Result2.u.UnsignedValue.u64;
4127	break;
4128	case kVBCppBinary_Addition:
4129	pResult->u.UnsignedValue.u64 += Result2.u.UnsignedValue.u64;
4130	break;
4131	case kVBCppBinary_Subtraction:
4132	pResult->u.UnsignedValue.u64 -= Result2.u.UnsignedValue.u64;
4133	break;
4134	case kVBCppBinary_LeftShift:
4135	pResult->u.UnsignedValue.u64 <<= Result2.u.UnsignedValue.u64;
4136	break;
4137	case kVBCppBinary_RightShift:
4138	pResult->u.UnsignedValue.u64 >>= Result2.u.UnsignedValue.u64;
4139	break;
4140	case kVBCppBinary_LessThan:
4141	pResult->u.UnsignedValue.u64 = pResult->u.UnsignedValue.u64 < Result2.u.UnsignedValue.u64;
4142	break;
4143	case kVBCppBinary_LessThanOrEqual:
4144	pResult->u.UnsignedValue.u64 = pResult->u.UnsignedValue.u64 <= Result2.u.UnsignedValue.u64;
4145	break;
4146	case kVBCppBinary_GreaterThan:
4147	pResult->u.UnsignedValue.u64 = pResult->u.UnsignedValue.u64 > Result2.u.UnsignedValue.u64;
4148	break;
4149	case kVBCppBinary_GreaterThanOrEqual:
4150	pResult->u.UnsignedValue.u64 = pResult->u.UnsignedValue.u64 >= Result2.u.UnsignedValue.u64;
4151	break;
4152	case kVBCppBinary_EqualTo:
4153	pResult->u.UnsignedValue.u64 = pResult->u.UnsignedValue.u64 == Result2.u.UnsignedValue.u64;
4154	break;
4155	case kVBCppBinary_NotEqualTo:
4156	pResult->u.UnsignedValue.u64 = pResult->u.UnsignedValue.u64 != Result2.u.UnsignedValue.u64;
4157	break;
4158	case kVBCppBinary_BitwiseAnd:
4159	pResult->u.UnsignedValue.u64 &= Result2.u.UnsignedValue.u64;
4160	break;
4161	case kVBCppBinary_BitwiseXor:
4162	pResult->u.UnsignedValue.u64 ^= Result2.u.UnsignedValue.u64;
4163	break;
4164	case kVBCppBinary_BitwiseOr:
4165	pResult->u.UnsignedValue.u64 \|= Result2.u.UnsignedValue.u64;
4166	break;
4167	case kVBCppBinary_LogicalAnd:
4168	pResult->u.UnsignedValue.u64 = pResult->u.UnsignedValue.u64 && Result2.u.UnsignedValue.u64;
4169	break;
4170	case kVBCppBinary_LogicalOr:
4171	pResult->u.UnsignedValue.u64 = pResult->u.UnsignedValue.u64 \|\| Result2.u.UnsignedValue.u64;
4172	break;
4173	default:
4174	return vbcppError(pThis, "Internal error: u.Binary.enmOperator=%d", pRoot->u.Binary.enmOperator);
4175	}
4176	}
4177	else
4178	{
4179	switch (pRoot->u.Binary.enmOperator)
4180	{
4181	case kVBCppBinary_Multiplication:
4182	pResult->u.SignedValue.s64 *= Result2.u.SignedValue.s64;
4183	break;
4184	case kVBCppBinary_Division:
4185	if (!Result2.u.SignedValue.s64)
4186	return vbcppError(pThis, "Divide by zero");
4187	pResult->u.SignedValue.s64 /= Result2.u.SignedValue.s64;
4188	break;
4189	case kVBCppBinary_Modulo:
4190	if (!Result2.u.SignedValue.s64)
4191	return vbcppError(pThis, "Divide by zero");
4192	pResult->u.SignedValue.s64 %= Result2.u.SignedValue.s64;
4193	break;
4194	case kVBCppBinary_Addition:
4195	pResult->u.SignedValue.s64 += Result2.u.SignedValue.s64;
4196	break;
4197	case kVBCppBinary_Subtraction:
4198	pResult->u.SignedValue.s64 -= Result2.u.SignedValue.s64;
4199	break;
4200	case kVBCppBinary_LeftShift:
4201	pResult->u.SignedValue.s64 <<= Result2.u.SignedValue.s64;
4202	break;
4203	case kVBCppBinary_RightShift:
4204	pResult->u.SignedValue.s64 >>= Result2.u.SignedValue.s64;
4205	break;
4206	case kVBCppBinary_LessThan:
4207	pResult->u.SignedValue.s64 = pResult->u.SignedValue.s64 < Result2.u.SignedValue.s64;
4208	break;
4209	case kVBCppBinary_LessThanOrEqual:
4210	pResult->u.SignedValue.s64 = pResult->u.SignedValue.s64 <= Result2.u.SignedValue.s64;
4211	break;
4212	case kVBCppBinary_GreaterThan:
4213	pResult->u.SignedValue.s64 = pResult->u.SignedValue.s64 > Result2.u.SignedValue.s64;
4214	break;
4215	case kVBCppBinary_GreaterThanOrEqual:
4216	pResult->u.SignedValue.s64 = pResult->u.SignedValue.s64 >= Result2.u.SignedValue.s64;
4217	break;
4218	case kVBCppBinary_EqualTo:
4219	pResult->u.SignedValue.s64 = pResult->u.SignedValue.s64 == Result2.u.SignedValue.s64;
4220	break;
4221	case kVBCppBinary_NotEqualTo:
4222	pResult->u.SignedValue.s64 = pResult->u.SignedValue.s64 != Result2.u.SignedValue.s64;
4223	break;
4224	case kVBCppBinary_BitwiseAnd:
4225	pResult->u.SignedValue.s64 &= Result2.u.SignedValue.s64;
4226	break;
4227	case kVBCppBinary_BitwiseXor:
4228	pResult->u.SignedValue.s64 ^= Result2.u.SignedValue.s64;
4229	break;
4230	case kVBCppBinary_BitwiseOr:
4231	pResult->u.SignedValue.s64 \|= Result2.u.SignedValue.s64;
4232	break;
4233	case kVBCppBinary_LogicalAnd:
4234	pResult->u.SignedValue.s64 = pResult->u.SignedValue.s64 && Result2.u.SignedValue.s64;
4235	break;
4236	case kVBCppBinary_LogicalOr:
4237	pResult->u.SignedValue.s64 = pResult->u.SignedValue.s64 \|\| Result2.u.SignedValue.s64;
4238	break;
4239	default:
4240	return vbcppError(pThis, "Internal error: u.Binary.enmOperator=%d", pRoot->u.Binary.enmOperator);
4241	}
4242	}
4243	return rcExit;
4244	}
4245
4246	case kVBCppExprKind_Ternary:
4247	rcExit = vbcppExprEvaluteTree(pThis, pRoot->u.Ternary.pExpr, pResult);
4248	if (rcExit != RTEXITCODE_SUCCESS)
4249	return rcExit;
4250	if (vbcppExprIsExprTrue(pResult))
4251	return vbcppExprEvaluteTree(pThis, pRoot->u.Ternary.pTrue, pResult);
4252	return vbcppExprEvaluteTree(pThis, pRoot->u.Ternary.pFalse, pResult);
4253
4254	default:
4255	return vbcppError(pThis, "Internal error: enmKind=%d", pRoot->enmKind);
4256	}
4257	}
4258
4259
4260	/**
4261	* Evalutes the expression.
4262	*
4263	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4264	* @param pThis The C preprocessor instance.
4265	* @param pszExpr The expression.
4266	* @param cchExpr The length of the expression.
4267	* @param penmResult Where to store the result.
4268	*/
4269	static RTEXITCODE vbcppExprEval(PVBCPP pThis, char pszExpr, size_t cchExpr, size_t cReplacements, VBCPPEVAL penmResult)
4270	{
4271	Assert(strlen(pszExpr) == cchExpr);
4272	RT_NOREF_PV(cReplacements);
4273
4274	size_t cUndefined;
4275	PVBCPPEXPR pExprTree;
4276	RTEXITCODE rcExit = vbcppExprParse(pThis, pszExpr, cchExpr, &pExprTree, &cUndefined);
4277	if (rcExit == RTEXITCODE_SUCCESS)
4278	{
4279	if ( !cUndefined
4280	\|\| pThis->enmMode == kVBCppMode_SelectiveD
4281	\|\| pThis->enmMode == kVBCppMode_Standard)
4282	{
4283	VBCPPEXPR Result;
4284	rcExit = vbcppExprEvaluteTree(pThis, pExprTree, &Result);
4285	if (rcExit == RTEXITCODE_SUCCESS)
4286	{
4287	if (vbcppExprIsExprTrue(&Result))
4288	*penmResult = kVBCppEval_True;
4289	else
4290	*penmResult = kVBCppEval_False;
4291	}
4292	}
4293	else
4294	*penmResult = kVBCppEval_Undecided;
4295	}
4296	return rcExit;
4297	}
4298
4299
4300	static RTEXITCODE vbcppExtractSkipCommentLine(PVBCPP pThis, PSCMSTREAM pStrmInput)
4301	{
4302	RT_NOREF_PV(pThis);
4303
4304	unsigned chPrev = ScmStreamGetCh(pStrmInput); Assert(chPrev == '/');
4305	unsigned ch;
4306	while ((ch = ScmStreamPeekCh(pStrmInput)) != ~(unsigned)0)
4307	{
4308	if (ch == '\r' \|\| ch == '\n')
4309	{
4310	if (chPrev != '\\')
4311	break;
4312	ScmStreamSeekByLine(pStrmInput, ScmStreamTellLine(pStrmInput) + 1);
4313	chPrev = ch;
4314	}
4315	else
4316	{
4317	chPrev = ScmStreamGetCh(pStrmInput);
4318	Assert(chPrev == ch);
4319	}
4320	}
4321	return RTEXITCODE_SUCCESS;
4322	}
4323
4324
4325	static RTEXITCODE vbcppExtractSkipComment(PVBCPP pThis, PSCMSTREAM pStrmInput)
4326	{
4327	unsigned ch = ScmStreamGetCh(pStrmInput); Assert(ch == '*');
4328	while ((ch = ScmStreamGetCh(pStrmInput)) != ~(unsigned)0)
4329	{
4330	if (ch == '*')
4331	{
4332	ch = ScmStreamGetCh(pStrmInput);
4333	if (ch == '/')
4334	return RTEXITCODE_SUCCESS;
4335	}
4336	}
4337	return vbcppError(pThis, "Expected '*/'");
4338	}
4339
4340
4341	static RTEXITCODE vbcppExtractQuotedString(PVBCPP pThis, PSCMSTREAM pStrmInput, PVBCPPSTRBUF pStrBuf,
4342	char chOpen, char chClose)
4343	{
4344	unsigned ch = ScmStreamGetCh(pStrmInput);
4345	Assert(ch == (unsigned)chOpen);
4346
4347	RTEXITCODE rcExit = vbcppStrBufAppendCh(pStrBuf, chOpen);
4348	if (rcExit != RTEXITCODE_SUCCESS)
4349	return rcExit;
4350
4351	for (;;)
4352	{
4353	ch = ScmStreamGetCh(pStrmInput);
4354	if (ch == '\\')
4355	{
4356	ch = ScmStreamGetCh(pStrmInput);
4357	if (ch == ~(unsigned)0)
4358	break;
4359	rcExit = vbcppStrBufAppendCh(pStrBuf, '\\');
4360	if (rcExit == RTEXITCODE_SUCCESS)
4361	rcExit = vbcppStrBufAppendCh(pStrBuf, ch);
4362	if (rcExit != RTEXITCODE_SUCCESS)
4363	return rcExit;
4364	}
4365	else if (ch != ~(unsigned)0)
4366	{
4367	rcExit = vbcppStrBufAppendCh(pStrBuf, ch);
4368	if (rcExit != RTEXITCODE_SUCCESS)
4369	return rcExit;
4370	if (ch == (unsigned)chClose)
4371	return RTEXITCODE_SUCCESS;
4372	}
4373	else
4374	break;
4375	}
4376
4377	return vbcppError(pThis, "File ended with an open character constant");
4378	}
4379
4380
4381	/**
4382	* Extracts a line from the stream, stripping it for comments and maybe
4383	* optimzing some of the whitespace.
4384	*
4385	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4386	* @param pThis The C preprocessor instance.
4387	* @param pStrmInput The input stream.
4388	* @param pStrBuf Where to store the extracted line. Caller must
4389	* initialize this prior to the call an delete it
4390	* after use (even on failure).
4391	* @param poffComment Where to note down the position of the final
4392	* comment. Optional.
4393	*/
4394	static RTEXITCODE vbcppExtractDirectiveLine(PVBCPP pThis, PSCMSTREAM pStrmInput, PVBCPPSTRBUF pStrBuf, size_t *poffComment)
4395	{
4396	size_t offComment = ~(size_t)0;
4397	unsigned ch;
4398	while ((ch = ScmStreamPeekCh(pStrmInput)) != ~(unsigned)0)
4399	{
4400	RTEXITCODE rcExit;
4401	if (ch == '/')
4402	{
4403	/* Comment? */
4404	unsigned ch2 = ScmStreamGetCh(pStrmInput); Assert(ch == ch2); NOREF(ch2);
4405	ch = ScmStreamPeekCh(pStrmInput);
4406	if (ch == '*')
4407	{
4408	offComment = ScmStreamTell(pStrmInput) - 1;
4409	rcExit = vbcppExtractSkipComment(pThis, pStrmInput);
4410	}
4411	else if (ch == '/')
4412	{
4413	offComment = ScmStreamTell(pStrmInput) - 1;
4414	rcExit = vbcppExtractSkipCommentLine(pThis, pStrmInput);
4415	}
4416	else
4417	rcExit = vbcppStrBufAppendCh(pStrBuf, '/');
4418	}
4419	else if (ch == '\'')
4420	{
4421	offComment = ~(size_t)0;
4422	rcExit = vbcppExtractQuotedString(pThis, pStrmInput, pStrBuf, '\'', '\'');
4423	}
4424	else if (ch == '"')
4425	{
4426	offComment = ~(size_t)0;
4427	rcExit = vbcppExtractQuotedString(pThis, pStrmInput, pStrBuf, '"', '"');
4428	}
4429	else if (ch == '\r' \|\| ch == '\n')
4430	break; /* done */
4431	else if ( RT_C_IS_SPACE(ch)
4432	&& ( RT_C_IS_SPACE(vbcppStrBufLastCh(pStrBuf))
4433	\|\| vbcppStrBufLastCh(pStrBuf) == '\0') )
4434	{
4435	unsigned ch2 = ScmStreamGetCh(pStrmInput);
4436	Assert(ch == ch2); NOREF(ch2);
4437	rcExit = RTEXITCODE_SUCCESS;
4438	}
4439	else
4440	{
4441	unsigned ch2 = ScmStreamGetCh(pStrmInput); Assert(ch == ch2);
4442
4443	/* Escaped newline? */
4444	if ( ch == '\\'
4445	&& ( (ch2 = ScmStreamPeekCh(pStrmInput)) == '\r'
4446	\|\| ch2 == '\n'))
4447	{
4448	ScmStreamSeekByLine(pStrmInput, ScmStreamTellLine(pStrmInput) + 1);
4449	rcExit = RTEXITCODE_SUCCESS;
4450	}
4451	else
4452	{
4453	offComment = ~(size_t)0;
4454	rcExit = vbcppStrBufAppendCh(pStrBuf, ch);
4455	}
4456	}
4457	if (rcExit != RTEXITCODE_SUCCESS)
4458	return rcExit;
4459	}
4460
4461	if (poffComment)
4462	*poffComment = offComment;
4463	return RTEXITCODE_SUCCESS;
4464	}
4465
4466
4467	/**
4468	* Processes a abbreviated line number directive.
4469	*
4470	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4471	* @param pThis The C preprocessor instance.
4472	* @param pStrmInput The input stream.
4473	* @param offStart The stream position where the directive
4474	* started (for pass thru).
4475	* @param enmKind The kind of directive we're processing.
4476	*/
4477	static RTEXITCODE vbcppDirectiveIfOrElif(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart,
4478	VBCPPCONDKIND enmKind)
4479	{
4480	/*
4481	* Check for missing #if if #elif.
4482	*/
4483	if ( enmKind == kVBCppCondKind_ElIf
4484	&& !pThis->pCondStack )
4485	return vbcppError(pThis, "#elif without #if");
4486
4487	/*
4488	* Extract the expression string.
4489	*/
4490	const char *pchCondition = ScmStreamGetCur(pStrmInput);
4491	size_t offComment;
4492	VBCPPMACROEXP ExpCtx;
4493	#if 0
4494	ExpCtx.pMacroStack = NULL;
4495	#endif
4496	ExpCtx.pStrmInput = NULL;
4497	ExpCtx.papszArgs = NULL;
4498	ExpCtx.cArgs = 0;
4499	ExpCtx.cArgsAlloced = 0;
4500	vbcppStrBufInit(&ExpCtx.StrBuf, pThis);
4501	RTEXITCODE rcExit = vbcppExtractDirectiveLine(pThis, pStrmInput, &ExpCtx.StrBuf, &offComment);
4502	if (rcExit == RTEXITCODE_SUCCESS)
4503	{
4504	size_t const cchCondition = ScmStreamGetCur(pStrmInput) - pchCondition;
4505
4506	/*
4507	* Expand known macros in it.
4508	*/
4509	size_t cReplacements;
4510	rcExit = vbcppMacroExpandReScan(pThis, &ExpCtx, kMacroReScanMode_Expression, &cReplacements);
4511	if (rcExit == RTEXITCODE_SUCCESS)
4512	{
4513	/*
4514	* Strip it and check that it's not empty.
4515	*/
4516	char *pszExpr = ExpCtx.StrBuf.pszBuf;
4517	size_t cchExpr = ExpCtx.StrBuf.cchBuf;
4518	while (cchExpr > 0 && RT_C_IS_SPACE(*pszExpr))
4519	pszExpr++, cchExpr--;
4520
4521	while (cchExpr > 0 && RT_C_IS_SPACE(pszExpr[cchExpr - 1]))
4522	{
4523	pszExpr[--cchExpr] = '\0';
4524	ExpCtx.StrBuf.cchBuf--;
4525	}
4526	if (cchExpr)
4527	{
4528	/*
4529	* Now, evalute the expression.
4530	*/
4531	VBCPPEVAL enmResult;
4532	rcExit = vbcppExprEval(pThis, pszExpr, cchExpr, cReplacements, &enmResult);
4533	if (rcExit == RTEXITCODE_SUCCESS)
4534	{
4535	/*
4536	* Take action.
4537	*/
4538	if (enmKind != kVBCppCondKind_ElIf)
4539	rcExit = vbcppCondPush(pThis, pStrmInput, offComment, enmKind, enmResult,
4540	pchCondition, cchCondition);
4541	else
4542	{
4543	PVBCPPCOND pCond = pThis->pCondStack;
4544	if ( pCond->enmResult != kVBCppEval_Undecided
4545	&& ( !pCond->pUp
4546	\|\| pCond->pUp->enmStackResult == kVBCppEval_True))
4547	{
4548	Assert(enmResult == kVBCppEval_True \|\| enmResult == kVBCppEval_False);
4549	if ( pCond->enmResult == kVBCppEval_False
4550	&& enmResult == kVBCppEval_True
4551	&& !pCond->fElIfDecided)
4552	{
4553	pCond->enmStackResult = kVBCppEval_True;
4554	pCond->fElIfDecided = true;
4555	}
4556	else
4557	pCond->enmStackResult = kVBCppEval_False;
4558	pThis->fIf0Mode = pCond->enmStackResult == kVBCppEval_False;
4559	}
4560	pCond->enmKind = kVBCppCondKind_ElIf;
4561	pCond->enmResult = enmResult;
4562	pCond->pchCond = pchCondition;
4563	pCond->cchCond = cchCondition;
4564
4565	/*
4566	* Do #elif pass thru.
4567	*/
4568	if ( !pThis->fIf0Mode
4569	&& pCond->enmResult == kVBCppEval_Undecided)
4570	{
4571	ssize_t cch = ScmStreamPrintf(&pThis->StrmOutput, "#%*selif", pCond->iKeepLevel - 1, "");
4572	if (cch > 0)
4573	rcExit = vbcppOutputComment(pThis, pStrmInput, offStart, cch, 2);
4574	else
4575	rcExit = vbcppError(pThis, "Output error %Rrc", (int)cch);
4576	}
4577	else
4578	pThis->fJustDroppedLine = true;
4579	}
4580	}
4581	}
4582	else
4583	rcExit = vbcppError(pThis, "Empty #if expression");
4584	}
4585	}
4586	vbcppMacroExpandCleanup(&ExpCtx);
4587	return rcExit;
4588	}
4589
4590
4591	/**
4592	* Processes a abbreviated line number directive.
4593	*
4594	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4595	* @param pThis The C preprocessor instance.
4596	* @param pStrmInput The input stream.
4597	* @param offStart The stream position where the directive
4598	* started (for pass thru).
4599	*/
4600	static RTEXITCODE vbcppDirectiveIfDef(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
4601	{
4602	/*
4603	* Parse it.
4604	*/
4605	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
4606	if (rcExit == RTEXITCODE_SUCCESS)
4607	{
4608	size_t cchDefine;
4609	const char *pchDefine = ScmStreamCGetWord(pStrmInput, &cchDefine);
4610	if (pchDefine)
4611	{
4612	rcExit = vbcppProcessSkipWhiteEscapedEolAndCommentsCheckEol(pThis, pStrmInput);
4613	if (rcExit == RTEXITCODE_SUCCESS)
4614	{
4615	/*
4616	* Evaluate it.
4617	*/
4618	VBCPPEVAL enmEval;
4619	if (vbcppMacroExists(pThis, pchDefine, cchDefine))
4620	enmEval = kVBCppEval_True;
4621	else if ( !pThis->fUndecidedConditionals
4622	\|\| RTStrSpaceGetN(&pThis->UndefStrSpace, pchDefine, cchDefine) != NULL)
4623	enmEval = kVBCppEval_False;
4624	else
4625	enmEval = kVBCppEval_Undecided;
4626	rcExit = vbcppCondPush(pThis, pStrmInput, offStart, kVBCppCondKind_IfDef, enmEval,
4627	pchDefine, cchDefine);
4628	}
4629	}
4630	else
4631	rcExit = vbcppError(pThis, "Malformed #ifdef");
4632	}
4633	return rcExit;
4634	}
4635
4636
4637	/**
4638	* Processes a abbreviated line number directive.
4639	*
4640	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4641	* @param pThis The C preprocessor instance.
4642	* @param pStrmInput The input stream.
4643	* @param offStart The stream position where the directive
4644	* started (for pass thru).
4645	*/
4646	static RTEXITCODE vbcppDirectiveIfNDef(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
4647	{
4648	/*
4649	* Parse it.
4650	*/
4651	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
4652	if (rcExit == RTEXITCODE_SUCCESS)
4653	{
4654	size_t cchDefine;
4655	const char *pchDefine = ScmStreamCGetWord(pStrmInput, &cchDefine);
4656	if (pchDefine)
4657	{
4658	rcExit = vbcppProcessSkipWhiteEscapedEolAndCommentsCheckEol(pThis, pStrmInput);
4659	if (rcExit == RTEXITCODE_SUCCESS)
4660	{
4661	/*
4662	* Evaluate it.
4663	*/
4664	VBCPPEVAL enmEval;
4665	if (vbcppMacroExists(pThis, pchDefine, cchDefine))
4666	enmEval = kVBCppEval_False;
4667	else if ( !pThis->fUndecidedConditionals
4668	\|\| RTStrSpaceGetN(&pThis->UndefStrSpace, pchDefine, cchDefine) != NULL)
4669	enmEval = kVBCppEval_True;
4670	else
4671	enmEval = kVBCppEval_Undecided;
4672	rcExit = vbcppCondPush(pThis, pStrmInput, offStart, kVBCppCondKind_IfNDef, enmEval,
4673	pchDefine, cchDefine);
4674	}
4675	}
4676	else
4677	rcExit = vbcppError(pThis, "Malformed #ifndef");
4678	}
4679	return rcExit;
4680	}
4681
4682
4683	/**
4684	* Processes a abbreviated line number directive.
4685	*
4686	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4687	* @param pThis The C preprocessor instance.
4688	* @param pStrmInput The input stream.
4689	* @param offStart The stream position where the directive
4690	* started (for pass thru).
4691	*/
4692	static RTEXITCODE vbcppDirectiveElse(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
4693	{
4694	/*
4695	* Nothing to parse, just comment positions to find and note down.
4696	*/
4697	offStart = vbcppProcessSkipWhite(pStrmInput);
4698	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndCommentsCheckEol(pThis, pStrmInput);
4699	if (rcExit == RTEXITCODE_SUCCESS)
4700	{
4701	/*
4702	* Execute.
4703	*/
4704	PVBCPPCOND pCond = pThis->pCondStack;
4705	if (pCond)
4706	{
4707	if (!pCond->fSeenElse)
4708	{
4709	pCond->fSeenElse = true;
4710	if ( pCond->enmResult != kVBCppEval_Undecided
4711	&& ( !pCond->pUp
4712	\|\| pCond->pUp->enmStackResult == kVBCppEval_True))
4713	{
4714	if ( pCond->enmResult == kVBCppEval_True
4715	\|\| pCond->fElIfDecided)
4716
4717	pCond->enmStackResult = kVBCppEval_False;
4718	else
4719	pCond->enmStackResult = kVBCppEval_True;
4720	pThis->fIf0Mode = pCond->enmStackResult == kVBCppEval_False;
4721	}
4722
4723	/*
4724	* Do pass thru.
4725	*/
4726	if ( !pThis->fIf0Mode
4727	&& pCond->enmResult == kVBCppEval_Undecided)
4728	{
4729	ssize_t cch = ScmStreamPrintf(&pThis->StrmOutput, "#%*selse", pCond->iKeepLevel - 1, "");
4730	if (cch > 0)
4731	rcExit = vbcppOutputComment(pThis, pStrmInput, offStart, cch, 2);
4732	else
4733	rcExit = vbcppError(pThis, "Output error %Rrc", (int)cch);
4734	}
4735	else
4736	pThis->fJustDroppedLine = true;
4737	}
4738	else
4739	rcExit = vbcppError(pThis, "Double #else or/and missing #endif");
4740	}
4741	else
4742	rcExit = vbcppError(pThis, "#else without #if");
4743	}
4744	return rcExit;
4745	}
4746
4747
4748	/**
4749	* Processes a abbreviated line number directive.
4750	*
4751	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4752	* @param pThis The C preprocessor instance.
4753	* @param pStrmInput The input stream.
4754	* @param offStart The stream position where the directive
4755	* started (for pass thru).
4756	*/
4757	static RTEXITCODE vbcppDirectiveEndif(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
4758	{
4759	/*
4760	* Nothing to parse, just comment positions to find and note down.
4761	*/
4762	offStart = vbcppProcessSkipWhite(pStrmInput);
4763	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndCommentsCheckEol(pThis, pStrmInput);
4764	if (rcExit == RTEXITCODE_SUCCESS)
4765	{
4766	/*
4767	* Execute.
4768	*/
4769	PVBCPPCOND pCond = pThis->pCondStack;
4770	if (pCond)
4771	{
4772	pThis->pCondStack = pCond->pUp;
4773	pThis->fIf0Mode = pCond->pUp && pCond->pUp->enmStackResult == kVBCppEval_False;
4774
4775	/*
4776	* Do pass thru.
4777	*/
4778	if ( !pThis->fIf0Mode
4779	&& pCond->enmResult == kVBCppEval_Undecided)
4780	{
4781	ssize_t cch = ScmStreamPrintf(&pThis->StrmOutput, "#%*sendif", pCond->iKeepLevel - 1, "");
4782	if (cch > 0)
4783	rcExit = vbcppOutputComment(pThis, pStrmInput, offStart, cch, 1);
4784	else
4785	rcExit = vbcppError(pThis, "Output error %Rrc", (int)cch);
4786	}
4787	else
4788	pThis->fJustDroppedLine = true;
4789	}
4790	else
4791	rcExit = vbcppError(pThis, "#endif without #if");
4792	}
4793	return rcExit;
4794	}
4795
4796
4797
4798
4799
4800	/*
4801	*
4802	*
4803	* Misc Directives
4804	* Misc Directives
4805	* Misc Directives
4806	* Misc Directives
4807	*
4808	*
4809	*/
4810
4811
4812	/**
4813	* Adds an include directory.
4814	*
4815	* @returns Program exit code, with error message on failure.
4816	* @param pThis The C preprocessor instance.
4817	* @param pszDir The directory to add.
4818	*/
4819	static RTEXITCODE vbcppAddInclude(PVBCPP pThis, const char *pszDir)
4820	{
4821	uint32_t cIncludes = pThis->cIncludes;
4822	if (cIncludes >= _64K)
4823	return vbcppError(pThis, "Too many include directories");
4824
4825	void pv = RTMemRealloc(pThis->papszIncludes, (cIncludes + 1) sizeof(char **));
4826	if (!pv)
4827	return vbcppError(pThis, "No memory for include directories");
4828	pThis->papszIncludes = (char **)pv;
4829
4830	int rc = RTStrDupEx(&pThis->papszIncludes[cIncludes], pszDir);
4831	if (RT_FAILURE(rc))
4832	return vbcppError(pThis, "No string memory for include directories");
4833
4834	pThis->cIncludes = cIncludes + 1;
4835	return RTEXITCODE_SUCCESS;
4836	}
4837
4838
4839	/**
4840	* Processes a abbreviated line number directive.
4841	*
4842	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4843	* @param pThis The C preprocessor instance.
4844	* @param pStrmInput The input stream.
4845	* @param offStart The stream position where the directive
4846	* started (for pass thru).
4847	*/
4848	static RTEXITCODE vbcppDirectiveInclude(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
4849	{
4850	RT_NOREF_PV(offStart);
4851
4852	/*
4853	* Parse it.
4854	*/
4855	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
4856	if (rcExit == RTEXITCODE_SUCCESS)
4857	{
4858	size_t cchFileSpec = 0;
4859	const char *pchFileSpec = NULL;
4860	size_t cchFilename = 0;
4861	const char *pchFilename = NULL;
4862
4863	unsigned ch = ScmStreamPeekCh(pStrmInput);
4864	unsigned chType = ch;
4865	if (ch == '"' \|\| ch == '<')
4866	{
4867	ScmStreamGetCh(pStrmInput);
4868	pchFileSpec = pchFilename = ScmStreamGetCur(pStrmInput);
4869	unsigned chEnd = chType == '<' ? '>' : '"';
4870	while ( (ch = ScmStreamGetCh(pStrmInput)) != ~(unsigned)0
4871	&& ch != chEnd)
4872	{
4873	if (ch == '\r' \|\| ch == '\n')
4874	{
4875	rcExit = vbcppError(pThis, "Multi-line include file specfications are not supported");
4876	break;
4877	}
4878	}
4879
4880	if (rcExit == RTEXITCODE_SUCCESS)
4881	{
4882	if (ch != ~(unsigned)0)
4883	cchFileSpec = cchFilename = ScmStreamGetCur(pStrmInput) - pchFilename - 1;
4884	else
4885	rcExit = vbcppError(pThis, "Expected '%c'", chType);
4886	}
4887	}
4888	else if (vbcppIsCIdentifierLeadChar(ch))
4889	{
4890	//pchFileSpec = ScmStreamCGetWord(pStrmInput, &cchFileSpec);
4891	rcExit = vbcppError(pThis, "Including via a define is not implemented yet");
4892	}
4893	else
4894	rcExit = vbcppError(pThis, "Malformed include directive");
4895
4896	/*
4897	* Take down the location of the next non-white space, in case we need
4898	* to pass thru the directive further down. Then skip to the end of the
4899	* line.
4900	*/
4901	size_t const offIncEnd = vbcppProcessSkipWhite(pStrmInput);
4902	if (rcExit == RTEXITCODE_SUCCESS)
4903	rcExit = vbcppProcessSkipWhiteEscapedEolAndCommentsCheckEol(pThis, pStrmInput);
4904
4905	if (rcExit == RTEXITCODE_SUCCESS)
4906	{
4907	/*
4908	* Execute it.
4909	*/
4910	if (pThis->enmIncludeAction == kVBCppIncludeAction_Include)
4911	{
4912	/** @todo Search for the include file and push it onto the input stack.
4913	* Not difficult, just unnecessary rigth now. */
4914	rcExit = vbcppError(pThis, "Includes are fully implemented");
4915	}
4916	else if (pThis->enmIncludeAction == kVBCppIncludeAction_PassThru)
4917	{
4918	/* Pretty print the passthru. */
4919	unsigned cchIndent = pThis->pCondStack ? pThis->pCondStack->iKeepLevel : 0;
4920	ssize_t cch;
4921	if (chType == '<')
4922	cch = ScmStreamPrintf(&pThis->StrmOutput, "#%sinclude <%.s>",
4923	cchIndent, "", cchFileSpec, pchFileSpec);
4924	else if (chType == '"')
4925	cch = ScmStreamPrintf(&pThis->StrmOutput, "#%sinclude \"%.s\"",
4926	cchIndent, "", cchFileSpec, pchFileSpec);
4927	else
4928	cch = ScmStreamPrintf(&pThis->StrmOutput, "#%sinclude %.s",
4929	cchIndent, "", cchFileSpec, pchFileSpec);
4930	if (cch > 0)
4931	rcExit = vbcppOutputComment(pThis, pStrmInput, offIncEnd, cch, 1);
4932	else
4933	rcExit = vbcppError(pThis, "Output error %Rrc", (int)cch);
4934
4935	}
4936	else
4937	{
4938	Assert(pThis->enmIncludeAction == kVBCppIncludeAction_Drop);
4939	pThis->fJustDroppedLine = true;
4940	}
4941	}
4942	}
4943	return rcExit;
4944	}
4945
4946
4947	/**
4948	* Processes a abbreviated line number directive.
4949	*
4950	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
4951	* @param pThis The C preprocessor instance.
4952	* @param pStrmInput The input stream.
4953	* @param offStart The stream position where the directive
4954	* started (for pass thru).
4955	*/
4956	static RTEXITCODE vbcppDirectivePragma(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
4957	{
4958	RT_NOREF_PV(offStart);
4959
4960	/*
4961	* Parse out the first word.
4962	*/
4963	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
4964	if (rcExit == RTEXITCODE_SUCCESS)
4965	{
4966	size_t cchPragma;
4967	const char *pchPragma = ScmStreamCGetWord(pStrmInput, &cchPragma);
4968	if (pchPragma)
4969	{
4970	size_t const off2nd = vbcppProcessSkipWhite(pStrmInput);
4971	size_t offComment;
4972	rcExit = vbcppInputSkipToEndOfDirectiveLine(pThis, pStrmInput, &offComment);
4973	if (rcExit == RTEXITCODE_SUCCESS)
4974	{
4975	/*
4976	* What to do about this
4977	*/
4978	bool fPassThru = false;
4979	if ( cchPragma == 1
4980	&& *pchPragma == 'D')
4981	fPassThru = pThis->fPassThruPragmaD;
4982	else if ( cchPragma == 3
4983	&& !strncmp(pchPragma, "STD", 3))
4984	fPassThru = pThis->fPassThruPragmaSTD;
4985	else
4986	fPassThru = pThis->fPassThruPragmaOther;
4987	if (fPassThru)
4988	{
4989	unsigned cchIndent = pThis->pCondStack ? pThis->pCondStack->iKeepLevel : 0;
4990	ssize_t cch = ScmStreamPrintf(&pThis->StrmOutput, "#%spragma %.s",
4991	cchIndent, "", cchPragma, pchPragma);
4992	if (cch > 0)
4993	rcExit = vbcppOutputComment(pThis, pStrmInput, off2nd, cch, 1);
4994	else
4995	rcExit = vbcppError(pThis, "output error");
4996	}
4997	else
4998	pThis->fJustDroppedLine = true;
4999	}
5000	}
5001	else
5002	rcExit = vbcppError(pThis, "Malformed #pragma");
5003	}
5004
5005	return rcExit;
5006	}
5007
5008
5009	/**
5010	* Processes an error directive.
5011	*
5012	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
5013	* @param pThis The C preprocessor instance.
5014	* @param pStrmInput The input stream.
5015	* @param offStart The stream position where the directive
5016	* started (for pass thru).
5017	*/
5018	static RTEXITCODE vbcppDirectiveError(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
5019	{
5020	RT_NOREF_PV(offStart);
5021	RT_NOREF_PV(pStrmInput);
5022	return vbcppError(pThis, "Hit an #error");
5023	}
5024
5025
5026	/**
5027	* Processes a abbreviated line number directive.
5028	*
5029	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
5030	* @param pThis The C preprocessor instance.
5031	* @param pStrmInput The input stream.
5032	* @param offStart The stream position where the directive
5033	* started (for pass thru).
5034	*/
5035	static RTEXITCODE vbcppDirectiveLineNo(PVBCPP pThis, PSCMSTREAM pStrmInput, size_t offStart)
5036	{
5037	RT_NOREF_PV(offStart);
5038	RT_NOREF_PV(pStrmInput);
5039	return vbcppError(pThis, "Not implemented: %s", __FUNCTION__);
5040	}
5041
5042
5043	/**
5044	* Processes a abbreviated line number directive.
5045	*
5046	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
5047	* @param pThis The C preprocessor instance.
5048	* @param pStrmInput The input stream.
5049	*/
5050	static RTEXITCODE vbcppDirectiveLineNoShort(PVBCPP pThis, PSCMSTREAM pStrmInput)
5051	{
5052	RT_NOREF_PV(pStrmInput);
5053	return vbcppError(pThis, "Not implemented: %s", __FUNCTION__);
5054	}
5055
5056
5057	/**
5058	* Handles a preprocessor directive.
5059	*
5060	* @returns RTEXITCODE_SUCCESS or RTEXITCODE_FAILURE+msg.
5061	* @param pThis The C preprocessor instance.
5062	* @param pStrmInput The input stream.
5063	*/
5064	static RTEXITCODE vbcppProcessDirective(PVBCPP pThis, PSCMSTREAM pStrmInput)
5065	{
5066	/*
5067	* Get the directive and do a string switch on it.
5068	*/
5069	RTEXITCODE rcExit = vbcppProcessSkipWhiteEscapedEolAndComments(pThis, pStrmInput);
5070	if (rcExit != RTEXITCODE_SUCCESS)
5071	return rcExit;
5072	size_t cchDirective;
5073	const char *pchDirective = ScmStreamCGetWord(pStrmInput, &cchDirective);
5074	if (pchDirective)
5075	{
5076	size_t const offStart = ScmStreamTell(pStrmInput);
5077	#define IS_DIRECTIVE(a_sz) ( sizeof(a_sz) - 1 == cchDirective && strncmp(pchDirective, a_sz, sizeof(a_sz) - 1) == 0)
5078	if (IS_DIRECTIVE("if"))
5079	rcExit = vbcppDirectiveIfOrElif(pThis, pStrmInput, offStart, kVBCppCondKind_If);
5080	else if (IS_DIRECTIVE("elif"))
5081	rcExit = vbcppDirectiveIfOrElif(pThis, pStrmInput, offStart, kVBCppCondKind_ElIf);
5082	else if (IS_DIRECTIVE("ifdef"))
5083	rcExit = vbcppDirectiveIfDef(pThis, pStrmInput, offStart);
5084	else if (IS_DIRECTIVE("ifndef"))
5085	rcExit = vbcppDirectiveIfNDef(pThis, pStrmInput, offStart);
5086	else if (IS_DIRECTIVE("else"))
5087	rcExit = vbcppDirectiveElse(pThis, pStrmInput, offStart);
5088	else if (IS_DIRECTIVE("endif"))
5089	rcExit = vbcppDirectiveEndif(pThis, pStrmInput, offStart);
5090	else if (!pThis->fIf0Mode)
5091	{
5092	if (IS_DIRECTIVE("include"))
5093	rcExit = vbcppDirectiveInclude(pThis, pStrmInput, offStart);
5094	else if (IS_DIRECTIVE("define"))
5095	rcExit = vbcppDirectiveDefine(pThis, pStrmInput, offStart);
5096	else if (IS_DIRECTIVE("undef"))
5097	rcExit = vbcppDirectiveUndef(pThis, pStrmInput, offStart);
5098	else if (IS_DIRECTIVE("pragma"))
5099	rcExit = vbcppDirectivePragma(pThis, pStrmInput, offStart);
5100	else if (IS_DIRECTIVE("error"))
5101	rcExit = vbcppDirectiveError(pThis, pStrmInput, offStart);
5102	else if (IS_DIRECTIVE("line"))
5103	rcExit = vbcppDirectiveLineNo(pThis, pStrmInput, offStart);
5104	else
5105	rcExit = vbcppError(pThis, "Unknown preprocessor directive '#%.*s'", cchDirective, pchDirective);
5106	}
5107	#undef IS_DIRECTIVE
5108	}
5109	else if (!pThis->fIf0Mode)
5110	{
5111	/* Could it be a # <num> "file" directive? */
5112	unsigned ch = ScmStreamPeekCh(pStrmInput);
5113	if (RT_C_IS_DIGIT(ch))
5114	rcExit = vbcppDirectiveLineNoShort(pThis, pStrmInput);
5115	else
5116	rcExit = vbcppError(pThis, "Malformed preprocessor directive");
5117	}
5118	return rcExit;
5119	}
5120
5121
5122	/*
5123	*
5124	*
5125	* M a i n b o d y.
5126	* M a i n b o d y.
5127	* M a i n b o d y.
5128	* M a i n b o d y.
5129	* M a i n b o d y.
5130	*
5131	*
5132	*/
5133
5134
5135	/**
5136	* Does the actually preprocessing of the input file.
5137	*
5138	* @returns Exit code.
5139	* @param pThis The C preprocessor instance.
5140	*/
5141	static RTEXITCODE vbcppPreprocess(PVBCPP pThis)
5142	{
5143	RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
5144
5145	/*
5146	* Parse.
5147	*/
5148	while (pThis->pInputStack)
5149	{
5150	pThis->fMaybePreprocessorLine = true;
5151
5152	PSCMSTREAM pStrmInput = &pThis->pInputStack->StrmInput;
5153	unsigned ch;
5154	while ((ch = ScmStreamGetCh(pStrmInput)) != ~(unsigned)0)
5155	{
5156	if (ch == '/')
5157	{
5158	ch = ScmStreamPeekCh(pStrmInput);
5159	if (ch == '*')
5160	rcExit = vbcppProcessMultiLineComment(pThis, pStrmInput);
5161	else if (ch == '/')
5162	rcExit = vbcppProcessOneLineComment(pThis, pStrmInput);
5163	else
5164	{
5165	pThis->fMaybePreprocessorLine = false;
5166	if (!pThis->fIf0Mode)
5167	rcExit = vbcppOutputCh(pThis, '/');
5168	}
5169	}
5170	else if (ch == '#' && pThis->fMaybePreprocessorLine)
5171	{
5172	rcExit = vbcppProcessDirective(pThis, pStrmInput);
5173	pStrmInput = &pThis->pInputStack->StrmInput;
5174	}
5175	else if (ch == '\r' \|\| ch == '\n')
5176	{
5177	if ( ( !pThis->fIf0Mode
5178	&& !pThis->fJustDroppedLine)
5179	\|\| !pThis->fRemoveDroppedLines
5180	\|\| !ScmStreamIsAtStartOfLine(&pThis->StrmOutput))
5181	rcExit = vbcppOutputCh(pThis, ch);
5182	pThis->fJustDroppedLine = false;
5183	pThis->fMaybePreprocessorLine = true;
5184	}
5185	else if (RT_C_IS_SPACE(ch))
5186	{
5187	if (!pThis->fIf0Mode)
5188	rcExit = vbcppOutputCh(pThis, ch);
5189	}
5190	else
5191	{
5192	pThis->fMaybePreprocessorLine = false;
5193	if (!pThis->fIf0Mode)
5194	{
5195	if (ch == '"')
5196	rcExit = vbcppProcessStringLitteral(pThis, pStrmInput);
5197	else if (ch == '\'')
5198	rcExit = vbcppProcessCharacterConstant(pThis, pStrmInput);
5199	else if (vbcppIsCIdentifierLeadChar(ch))
5200	rcExit = vbcppProcessIdentifier(pThis, pStrmInput);
5201	else if (RT_C_IS_DIGIT(ch))
5202	rcExit = vbcppProcessNumber(pThis, pStrmInput, ch);
5203	else
5204	rcExit = vbcppOutputCh(pThis, ch);
5205	}
5206	}
5207	if (rcExit != RTEXITCODE_SUCCESS)
5208	break;
5209	}
5210
5211	/*
5212	* Check for errors.
5213	*/
5214	if (rcExit != RTEXITCODE_SUCCESS)
5215	break;
5216
5217	/*
5218	* Pop the input stack.
5219	*/
5220	PVBCPPINPUT pPopped = pThis->pInputStack;
5221	pThis->pInputStack = pPopped->pUp;
5222	RTMemFree(pPopped);
5223	}
5224
5225	return rcExit;
5226	}
5227
5228
5229	/**
5230	* Opens the input and output streams.
5231	*
5232	* @returns Exit code.
5233	* @param pThis The C preprocessor instance.
5234	*/
5235	static RTEXITCODE vbcppOpenStreams(PVBCPP pThis)
5236	{
5237	if (!pThis->pszInput)
5238	return vbcppError(pThis, "Preprocessing the standard input stream is currently not supported");
5239
5240	size_t cchName = strlen(pThis->pszInput);
5241	PVBCPPINPUT pInput = (PVBCPPINPUT)RTMemAlloc(RT_UOFFSETOF_DYN(VBCPPINPUT, szName[cchName + 1]));
5242	if (!pInput)
5243	return vbcppError(pThis, "out of memory");
5244	pInput->pUp = pThis->pInputStack;
5245	pInput->pszSpecified = pInput->szName;
5246	memcpy(pInput->szName, pThis->pszInput, cchName + 1);
5247	pThis->pInputStack = pInput;
5248	int rc = ScmStreamInitForReading(&pInput->StrmInput, pThis->pszInput);
5249	if (RT_FAILURE(rc))
5250	return vbcppError(pThis, "ScmStreamInitForReading returned %Rrc when opening input file (%s)",
5251	rc, pThis->pszInput);
5252
5253	rc = ScmStreamInitForWriting(&pThis->StrmOutput, &pInput->StrmInput);
5254	if (RT_FAILURE(rc))
5255	return vbcppError(pThis, "ScmStreamInitForWriting returned %Rrc", rc);
5256
5257	pThis->fStrmOutputValid = true;
5258	return RTEXITCODE_SUCCESS;
5259	}
5260
5261
5262	/**
5263	* Changes the preprocessing mode.
5264	*
5265	* @param pThis The C preprocessor instance.
5266	* @param enmMode The new mode.
5267	*/
5268	static void vbcppSetMode(PVBCPP pThis, VBCPPMODE enmMode)
5269	{
5270	switch (enmMode)
5271	{
5272	case kVBCppMode_Standard:
5273	pThis->fKeepComments = false;
5274	pThis->fRespectSourceDefines = true;
5275	pThis->fAllowRedefiningCmdLineDefines = true;
5276	pThis->fPassThruDefines = false;
5277	pThis->fUndecidedConditionals = false;
5278	pThis->fPassThruPragmaD = false;
5279	pThis->fPassThruPragmaSTD = true;
5280	pThis->fPassThruPragmaOther = true;
5281	pThis->fRemoveDroppedLines = false;
5282	pThis->fLineSplicing = true;
5283	pThis->enmIncludeAction = kVBCppIncludeAction_Include;
5284	break;
5285
5286	case kVBCppMode_Selective:
5287	pThis->fKeepComments = true;
5288	pThis->fRespectSourceDefines = false;
5289	pThis->fAllowRedefiningCmdLineDefines = false;
5290	pThis->fPassThruDefines = true;
5291	pThis->fUndecidedConditionals = true;
5292	pThis->fPassThruPragmaD = true;
5293	pThis->fPassThruPragmaSTD = true;
5294	pThis->fPassThruPragmaOther = true;
5295	pThis->fRemoveDroppedLines = true;
5296	pThis->fLineSplicing = false;
5297	pThis->enmIncludeAction = kVBCppIncludeAction_PassThru;
5298	break;
5299
5300	case kVBCppMode_SelectiveD:
5301	pThis->fKeepComments = true;
5302	pThis->fRespectSourceDefines = true;
5303	pThis->fAllowRedefiningCmdLineDefines = false;
5304	pThis->fPassThruDefines = false;
5305	pThis->fUndecidedConditionals = false;
5306	pThis->fPassThruPragmaD = true;
5307	pThis->fPassThruPragmaSTD = false;
5308	pThis->fPassThruPragmaOther = false;
5309	pThis->fRemoveDroppedLines = true;
5310	pThis->fLineSplicing = false;
5311	pThis->enmIncludeAction = kVBCppIncludeAction_Drop;
5312	break;
5313
5314	default:
5315	AssertFailedReturnVoid();
5316	}
5317	pThis->enmMode = enmMode;
5318	}
5319
5320
5321	/**
5322	* Parses the command line options.
5323	*
5324	* @returns Program exit code. Exit on non-success or if *pfExit is set.
5325	* @param pThis The C preprocessor instance.
5326	* @param argc The argument count.
5327	* @param argv The argument vector.
5328	* @param pfExit Pointer to the exit indicator.
5329	*/
5330	static RTEXITCODE vbcppParseOptions(PVBCPP pThis, int argc, char *argv, bool pfExit)
5331	{
5332	RTEXITCODE rcExit;
5333
5334	*pfExit = false;
5335
5336	/*
5337	* Option config.
5338	*/
5339	static RTGETOPTDEF const s_aOpts[] =
5340	{
5341	{ "--define", 'D', RTGETOPT_REQ_STRING },
5342	{ "--include-dir", 'I', RTGETOPT_REQ_STRING },
5343	{ "--undefine", 'U', RTGETOPT_REQ_STRING },
5344	{ "--keep-comments", 'C', RTGETOPT_REQ_NOTHING },
5345	{ "--strip-comments", 'c', RTGETOPT_REQ_NOTHING },
5346	{ "--D-strip", 'd', RTGETOPT_REQ_NOTHING },
5347	};
5348
5349	RTGETOPTUNION ValueUnion;
5350	RTGETOPTSTATE GetOptState;
5351	int rc = RTGetOptInit(&GetOptState, argc, argv, &s_aOpts[0], RT_ELEMENTS(s_aOpts), 1, RTGETOPTINIT_FLAGS_OPTS_FIRST);
5352	AssertReleaseRCReturn(rc, RTEXITCODE_FAILURE);
5353
5354	/*
5355	* Process the options.
5356	*/
5357	while ((rc = RTGetOpt(&GetOptState, &ValueUnion)) != 0)
5358	{
5359	switch (rc)
5360	{
5361	case 'c':
5362	pThis->fKeepComments = false;
5363	break;
5364
5365	case 'C':
5366	pThis->fKeepComments = false;
5367	break;
5368
5369	case 'd':
5370	vbcppSetMode(pThis, kVBCppMode_SelectiveD);
5371	break;
5372
5373	case 'D':
5374	{
5375	const char *pszEqual = strchr(ValueUnion.psz, '=');
5376	if (pszEqual)
5377	rcExit = vbcppMacroAdd(pThis, ValueUnion.psz, pszEqual - ValueUnion.psz, pszEqual + 1, RTSTR_MAX, true);
5378	else
5379	rcExit = vbcppMacroAdd(pThis, ValueUnion.psz, RTSTR_MAX, "1", 1, true);
5380	if (rcExit != RTEXITCODE_SUCCESS)
5381	return rcExit;
5382	break;
5383	}
5384
5385	case 'I':
5386	rcExit = vbcppAddInclude(pThis, ValueUnion.psz);
5387	if (rcExit != RTEXITCODE_SUCCESS)
5388	return rcExit;
5389	break;
5390
5391	case 'U':
5392	rcExit = vbcppMacroUndef(pThis, ValueUnion.psz, RTSTR_MAX, true);
5393	break;
5394
5395	case 'h':
5396	RTPrintf("No help yet, sorry\n");
5397	*pfExit = true;
5398	return RTEXITCODE_SUCCESS;
5399
5400	case 'V':
5401	{
5402	/* The following is assuming that svn does it's job here. */
5403	static const char s_szRev[] = "$Revision: 96407 $";
5404	const char *psz = RTStrStripL(strchr(s_szRev, ' '));
5405	RTPrintf("r%.*s\n", strchr(psz, ' ') - psz, psz);
5406	*pfExit = true;
5407	return RTEXITCODE_SUCCESS;
5408	}
5409
5410	case VINF_GETOPT_NOT_OPTION:
5411	if (!pThis->pszInput)
5412	pThis->pszInput = ValueUnion.psz;
5413	else if (!pThis->pszOutput)
5414	pThis->pszOutput = ValueUnion.psz;
5415	else
5416	return RTMsgErrorExit(RTEXITCODE_SYNTAX, "too many file arguments");
5417	break;
5418
5419
5420	/*
5421	* Errors and bugs.
5422	*/
5423	default:
5424	return RTGetOptPrintError(rc, &ValueUnion);
5425	}
5426	}
5427
5428	return RTEXITCODE_SUCCESS;
5429	}
5430
5431
5432	/**
5433	* Terminates the preprocessor.
5434	*
5435	* This may return failure if an error was delayed.
5436	*
5437	* @returns Exit code.
5438	* @param pThis The C preprocessor instance.
5439	*/
5440	static RTEXITCODE vbcppTerm(PVBCPP pThis)
5441	{
5442	/*
5443	* Flush the output first.
5444	*/
5445	if (pThis->fStrmOutputValid)
5446	{
5447	if (pThis->pszOutput)
5448	{
5449	int rc = ScmStreamWriteToFile(&pThis->StrmOutput, "%s", pThis->pszOutput);
5450	if (RT_FAILURE(rc))
5451	vbcppError(pThis, "ScmStreamWriteToFile failed with %Rrc when writing '%s'", rc, pThis->pszOutput);
5452	}
5453	else
5454	{
5455	int rc = ScmStreamWriteToStdOut(&pThis->StrmOutput);
5456	if (RT_FAILURE(rc))
5457	vbcppError(pThis, "ScmStreamWriteToStdOut failed with %Rrc", rc);
5458	}
5459	}
5460
5461	/*
5462	* Cleanup.
5463	*/
5464	while (pThis->pInputStack)
5465	{
5466	ScmStreamDelete(&pThis->pInputStack->StrmInput);
5467	void *pvFree = pThis->pInputStack;
5468	pThis->pInputStack = pThis->pInputStack->pUp;
5469	RTMemFree(pvFree);
5470	}
5471
5472	ScmStreamDelete(&pThis->StrmOutput);
5473
5474	RTStrSpaceDestroy(&pThis->StrSpace, vbcppMacroFree, NULL);
5475	pThis->StrSpace = NULL;
5476
5477	uint32_t i = pThis->cIncludes;
5478	while (i-- > 0)
5479	RTStrFree(pThis->papszIncludes[i]);
5480	RTMemFree(pThis->papszIncludes);
5481	pThis->papszIncludes = NULL;
5482
5483	return pThis->rcExit;
5484	}
5485
5486
5487	/**
5488	* Initializes the C preprocessor instance data.
5489	*
5490	* @param pThis The C preprocessor instance data.
5491	*/
5492	static void vbcppInit(PVBCPP pThis)
5493	{
5494	vbcppSetMode(pThis, kVBCppMode_Selective);
5495	pThis->cIncludes = 0;
5496	pThis->papszIncludes = NULL;
5497	pThis->pszInput = NULL;
5498	pThis->pszOutput = NULL;
5499	pThis->StrSpace = NULL;
5500	pThis->UndefStrSpace = NULL;
5501	pThis->cCondStackDepth = 0;
5502	pThis->pCondStack = NULL;
5503	pThis->fIf0Mode = false;
5504	pThis->fJustDroppedLine = false;
5505	pThis->fMaybePreprocessorLine = true;
5506	VBCPP_BITMAP_EMPTY(pThis->bmDefined);
5507	pThis->cCondStackDepth = 0;
5508	pThis->pInputStack = NULL;
5509	RT_ZERO(pThis->StrmOutput);
5510	pThis->rcExit = RTEXITCODE_SUCCESS;
5511	pThis->fStrmOutputValid = false;
5512	}
5513
5514
5515
5516	int main(int argc, char **argv)
5517	{
5518	int rc = RTR3InitExe(argc, &argv, 0);
5519	if (RT_FAILURE(rc))
5520	return RTMsgInitFailure(rc);
5521
5522	/*
5523	* Do the job. The code says it all.
5524	*/
5525	VBCPP This;
5526	vbcppInit(&This);
5527	bool fExit;
5528	RTEXITCODE rcExit = vbcppParseOptions(&This, argc, argv, &fExit);
5529	if (!fExit && rcExit == RTEXITCODE_SUCCESS)
5530	{
5531	rcExit = vbcppOpenStreams(&This);
5532	if (rcExit == RTEXITCODE_SUCCESS)
5533	rcExit = vbcppPreprocess(&This);
5534	}
5535
5536	if (rcExit == RTEXITCODE_SUCCESS)
5537	rcExit = vbcppTerm(&This);
5538	else
5539	vbcppTerm(&This);
5540	return rcExit;
5541	}
5542

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source: vbox/trunk/src/bldprogs/VBoxCPP.cpp@ 96407

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