bldprog-strtab-template.cpp.h@ 81732

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1	/* $Id: bldprog-strtab-template.cpp.h 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* IPRT - Build Program - String Table Generator.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*
29	* (Avoid include sanity checks as this is ring-3 only, C++ code.)
30	*/
31	#if defined(__cplusplus) && defined(IN_RING3)
32
33
34	/*********************************************************************************************************************************
35	* Defined Constants And Macros *
36	*********************************************************************************************************************************/
37	/** @def BLDPROG_STRTAB_MAX_STRLEN
38	* The max length of strings in the table. */
39	#if !defined(BLDPROG_STRTAB_MAX_STRLEN) \|\| defined(DOXYGEN_RUNNING)
40	# define BLDPROG_STRTAB_MAX_STRLEN 256
41	#endif
42
43	/** @def BLDPROG_STRTAB_WITH_COMPRESSION
44	* Enables very simple string compression.
45	*/
46	#if defined(DOXYGEN_RUNNING)
47	# define BLDPROG_STRTAB_WITH_COMPRESSION
48	#endif
49
50	/** @def BLDPROG_STRTAB_WITH_CAMEL_WORDS
51	* Modifies the string compression to look for camel case words.
52	*/
53	#if defined(DOXYGEN_RUNNING)
54	# define BLDPROG_STRTAB_WITH_CAMEL_WORDS
55	#endif
56
57	/** @def BLDPROG_STRTAB_PURE_ASCII
58	* String compression assumes pure 7-bit ASCII and will fail on UTF-8 when this
59	* is defined. Otherwise, the compression code will require IPRT to link.
60	*/
61	#if defined(DOXYGEN_RUNNING)
62	# define BLDPROG_STRTAB_PURE_ASCII
63	#endif
64
65
66
67	/*********************************************************************************************************************************
68	* Header Files *
69	*********************************************************************************************************************************/
70	#include <iprt/stdarg.h>
71	#include <iprt/ctype.h>
72	#include <stdlib.h>
73	#include <stdio.h>
74	#include <string.h>
75
76	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
77	# include <algorithm>
78	# include <map>
79	# include <string>
80	# include <vector>
81
82	typedef std::map<std::string, size_t> BLDPROGWORDFREQMAP;
83	typedef BLDPROGWORDFREQMAP::value_type BLDPROGWORDFREQPAIR;
84
85	#endif
86
87	#include "../../src/VBox/Runtime/include/internal/strhash.h" /** @todo make this one public */
88
89
90	/*********************************************************************************************************************************
91	* Structures and Typedefs *
92	*********************************************************************************************************************************/
93	/**
94	* Build table string.
95	*/
96	typedef struct BLDPROGSTRING
97	{
98	/** The string.
99	* @note This may be modified or replaced (allocated from heap) when
100	* compressing the string table. */
101	char *pszString;
102	/** The string hash value. */
103	uint32_t uHash;
104	/** The strint table offset. */
105	uint32_t offStrTab;
106	/** The string length. */
107	size_t cchString;
108	/** Pointer to the next string reference (same string table entry). */
109	struct BLDPROGSTRING *pNextRef;
110	/** Pointer to the next string with the same hash value (collision). */
111	struct BLDPROGSTRING *pNextCollision;
112
113	} BLDPROGSTRING;
114	/** Pointer to a string table string. */
115	typedef BLDPROGSTRING *PBLDPROGSTRING;
116
117
118	/** String table data. */
119	typedef struct BLDPROGSTRTAB
120	{
121	/** The size of g_papStrHash. */
122	size_t cStrHash;
123	/** String hash table. */
124	PBLDPROGSTRING *papStrHash;
125	/** Duplicate strings found by AddString. */
126	size_t cDuplicateStrings;
127	/** Total length of the unique strings (no terminators). */
128	size_t cchUniqueStrings;
129	/** Number of unique strings after AddString. */
130	size_t cUniqueStrings;
131	/** Number of collisions. */
132	size_t cCollisions;
133
134	/** Number of entries in apSortedStrings. */
135	size_t cSortedStrings;
136	/** The sorted string table. */
137	PBLDPROGSTRING *papSortedStrings;
138
139	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
140	/** The 127 words we've picked to be indexed by reference. */
141	BLDPROGSTRING aCompDict[127];
142	/** Incoming strings pending compression. */
143	PBLDPROGSTRING *papPendingStrings;
144	/** Current number of entries in papStrPending. */
145	size_t cPendingStrings;
146	/** The allocated size of papPendingStrings. */
147	size_t cMaxPendingStrings;
148	/** Work frequency map.
149	* @todo rewrite in plain C. */
150	BLDPROGWORDFREQMAP Frequencies;
151	#endif
152
153	/** The string table. */
154	char *pachStrTab;
155	/** The actual string table size. */
156	size_t cchStrTab;
157	} BLDPROGSTRTAB;
158	typedef BLDPROGSTRTAB *PBLDPROGSTRTAB;
159
160	#if RT_CLANG_PREREQ(4, 0) \|\| RT_GNUC_PREREQ(4, 6)
161	# pragma GCC diagnostic push
162	# pragma GCC diagnostic ignored "-Wunused-function"
163	#endif
164
165
166	/**
167	* Initializes the strint table compiler.
168	*
169	* @returns success indicator (out of memory if false).
170	* @param pThis The strint table compiler instance.
171	* @param cMaxStrings The max number of strings we'll be adding.
172	*/
173	static bool BldProgStrTab_Init(PBLDPROGSTRTAB pThis, size_t cMaxStrings)
174	{
175	pThis->cStrHash = 0;
176	pThis->papStrHash = NULL;
177	pThis->cDuplicateStrings = 0;
178	pThis->cchUniqueStrings = 0;
179	pThis->cUniqueStrings = 0;
180	pThis->cCollisions = 0;
181	pThis->cSortedStrings = 0;
182	pThis->papSortedStrings = NULL;
183	pThis->pachStrTab = NULL;
184	pThis->cchStrTab = 0;
185	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
186	memset(pThis->aCompDict, 0, sizeof(pThis->aCompDict));
187	pThis->papPendingStrings = NULL;
188	pThis->cPendingStrings = 0;
189	pThis->cMaxPendingStrings = cMaxStrings;
190	#endif
191
192	/*
193	* Allocate a hash table double the size of all strings (to avoid too
194	* many collisions). Add all strings to it, finding duplicates in the
195	* process.
196	*/
197	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
198	cMaxStrings += RT_ELEMENTS(pThis->aCompDict);
199	#endif
200	cMaxStrings *= 2;
201	pThis->papStrHash = (PBLDPROGSTRING *)calloc(sizeof(pThis->papStrHash[0]), cMaxStrings);
202	if (pThis->papStrHash)
203	{
204	pThis->cStrHash = cMaxStrings;
205	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
206	pThis->papPendingStrings = (PBLDPROGSTRING *)calloc(sizeof(pThis->papPendingStrings[0]), pThis->cMaxPendingStrings);
207	if (pThis->papPendingStrings)
208	#endif
209	return true;
210
211	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
212	free(pThis->papStrHash);
213	pThis->papStrHash = NULL;
214	#endif
215	}
216	return false;
217	}
218
219
220	#if 0 /* unused */
221	static void BldProgStrTab_Delete(PBLDPROGSTRTAB pThis)
222	{
223	free(pThis->papStrHash);
224	free(pThis->papSortedStrings);
225	free(pThis->pachStrTab);
226	# ifdef BLDPROG_STRTAB_WITH_COMPRESSION
227	free(pThis->papPendingStrings);
228	# endif
229	memset(pThis, 0, sizeof(*pThis));
230	}
231	#endif
232
233	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
234
235	DECLINLINE(size_t) bldProgStrTab_compressorFindNextWord(const char pszSrc, char ch, const char *ppszSrc)
236	{
237	/*
238	* Skip leading word separators.
239	*/
240	# ifdef BLDPROG_STRTAB_WITH_CAMEL_WORDS
241	while ( ch == ' '
242	\|\| ch == '-'
243	\|\| ch == '+'
244	\|\| ch == '_')
245	# else
246	while (ch == ' ')
247	# endif
248	ch = *++pszSrc;
249	if (ch)
250	{
251	/*
252	* Find end of word.
253	*/
254	size_t cchWord = 1;
255	# ifdef BLDPROG_STRTAB_WITH_CAMEL_WORDS
256	char chPrev = ch;
257	while ( (ch = pszSrc[cchWord]) != ' '
258	&& ch != '\0'
259	&& ch != '-'
260	&& ch != '+'
261	&& ch != '_'
262	&& ( ch == chPrev
263	\|\| !RT_C_IS_UPPER(ch)
264	\|\| RT_C_IS_UPPER(chPrev)) )
265	{
266	chPrev = ch;
267	cchWord++;
268	}
269	# else
270	while ((ch = pszSrc[cchWord]) != ' ' && ch != '\0')
271	cchWord++;
272	# endif
273	*ppszSrc = pszSrc;
274	return cchWord;
275	}
276
277	*ppszSrc = pszSrc;
278	return 0;
279	}
280
281
282	/**
283	* Analyzes a string.
284	*
285	* @param pThis The strint table compiler instance.
286	* @param pStr The string to analyze.
287	*/
288	static void bldProgStrTab_compressorAnalyzeString(PBLDPROGSTRTAB pThis, PBLDPROGSTRING pStr)
289	{
290	const char *psz = pStr->pszString;
291
292	/*
293	* For now we just consider words.
294	*/
295	char ch;
296	while ((ch = *psz) != '\0')
297	{
298	size_t cchWord = bldProgStrTab_compressorFindNextWord(psz, ch, &psz);
299	if (cchWord > 1)
300	{
301	std::string strWord(psz, cchWord);
302	BLDPROGWORDFREQMAP::iterator it = pThis->Frequencies.find(strWord);
303	if (it != pThis->Frequencies.end())
304	it->second += cchWord - 1;
305	else
306	pThis->Frequencies[strWord] = 0;
307
308	/** @todo could gain hits by including the space after the word, but that
309	* has the same accounting problems as the two words scenario below. */
310
311	# if 0 /** @todo need better accounting for overlapping alternatives before this can be enabled. */
312	/* Two words - immediate yields calc may lie when this enabled and we may pick the wrong words. */
313	if (ch == ' ')
314	{
315	ch = psz[++cchWord];
316	if (ch != ' ' && ch != '\0')
317	{
318	size_t const cchSaved = cchWord;
319
320	do
321	cchWord++;
322	while ((ch = psz[cchWord]) != ' ' && ch != '\0');
323
324	strWord = std::string(psz, cchWord);
325	BLDPROGWORDFREQMAP::iterator it = pThis->Frequencies.find(strWord);
326	if (it != pThis->Frequencies.end())
327	it->second += cchWord - 1;
328	else
329	pThis->Frequencies[strWord] = 0;
330
331	cchWord = cchSaved;
332	}
333	}
334	# endif
335	}
336	else if (!cchWord)
337	break;
338
339	/* Advance. */
340	psz += cchWord;
341	}
342	pStr->cchString = psz - pStr->pszString;
343	if (pStr->cchString > BLDPROG_STRTAB_MAX_STRLEN)
344	{
345	fprintf(stderr, "error: String to long (%u)\n", (unsigned)pStr->cchString);
346	abort();
347	}
348	}
349
350	#endif /* BLDPROG_STRTAB_WITH_COMPRESSION */
351
352	/**
353	* Adds a string to the hash table.
354	* @param pThis The strint table compiler instance.
355	* @param pStr The string.
356	*/
357	static void bldProgStrTab_AddStringToHashTab(PBLDPROGSTRTAB pThis, PBLDPROGSTRING pStr)
358	{
359	pStr->pNextRef = NULL;
360	pStr->pNextCollision = NULL;
361	pStr->offStrTab = 0;
362	pStr->uHash = sdbm(pStr->pszString, &pStr->cchString);
363	if (pStr->cchString > BLDPROG_STRTAB_MAX_STRLEN)
364	{
365	fprintf(stderr, "error: String to long (%u)\n", (unsigned)pStr->cchString);
366	exit(RTEXITCODE_FAILURE);
367	}
368
369	size_t idxHash = pStr->uHash % pThis->cStrHash;
370	PBLDPROGSTRING pCur = pThis->papStrHash[idxHash];
371	if (!pCur)
372	pThis->papStrHash[idxHash] = pStr;
373	else
374	{
375	/* Look for matching string. */
376	do
377	{
378	if ( pCur->uHash == pStr->uHash
379	&& pCur->cchString == pStr->cchString
380	&& memcmp(pCur->pszString, pStr->pszString, pStr->cchString) == 0)
381	{
382	pStr->pNextRef = pCur->pNextRef;
383	pCur->pNextRef = pStr;
384	pThis->cDuplicateStrings++;
385	return;
386	}
387	pCur = pCur->pNextCollision;
388	} while (pCur != NULL);
389
390	/* No matching string, insert. */
391	pThis->cCollisions++;
392	pStr->pNextCollision = pThis->papStrHash[idxHash];
393	pThis->papStrHash[idxHash] = pStr;
394	}
395
396	pThis->cUniqueStrings++;
397	pThis->cchUniqueStrings += pStr->cchString;
398	}
399
400
401	/**
402	* Adds a string to the string table.
403	*
404	* @param pThis The strint table compiler instance.
405	* @param pStr The string.
406	*/
407	static void BldProgStrTab_AddString(PBLDPROGSTRTAB pThis, PBLDPROGSTRING pStr)
408	{
409	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
410	bldProgStrTab_compressorAnalyzeString(pThis, pStr);
411	if (pThis->cPendingStrings < pThis->cMaxPendingStrings)
412	pThis->papPendingStrings[pThis->cPendingStrings++] = pStr;
413	else
414	abort();
415	#else
416	bldProgStrTab_AddStringToHashTab(pThis, pStr);
417	#endif
418	}
419
420	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
421
422	/**
423	* Copies @a cchSrc chars from @a pchSrc to @a pszDst, escaping special
424	* sequences.
425	*
426	* @returns New @a pszDst position, NULL if invalid source encoding.
427	* @param pszDst The destination buffer.
428	* @param pszSrc The source buffer.
429	* @param cchSrc How much to copy.
430	*/
431	static char bldProgStrTab_compressorCopyAndEscape(char pszDst, const char *pszSrc, size_t cchSrc)
432	{
433	while (cchSrc-- > 0)
434	{
435	char ch = *pszSrc;
436	if (!((unsigned char)ch & 0x80))
437	{
438	*pszDst++ = ch;
439	pszSrc++;
440	}
441	else
442	{
443	# ifdef BLDPROG_STRTAB_PURE_ASCII
444	fprintf(stderr, "error: unexpected char value %#x\n", ch);
445	return NULL;
446	# else
447	RTUNICP uc;
448	int rc = RTStrGetCpEx(&pszSrc, &uc);
449	if (RT_SUCCESS(rc))
450	{
451	pszDst++ = (unsigned char)0xff; / escape single code point. */
452	pszDst = RTStrPutCp(pszDst, uc);
453	}
454	else
455	{
456	fprintf(stderr, "Error: RTStrGetCpEx failed with rc=%d\n", rc);
457	return NULL;
458	}
459	# endif
460	}
461	}
462	return pszDst;
463	}
464
465
466	/**
467	* Replaces the dictionary words and escapes non-ascii chars in a string.
468	*
469	* @param pThis The strint table compiler instance.
470	* @param pString The string to fixup.
471	*/
472	static bool bldProgStrTab_compressorFixupString(PBLDPROGSTRTAB pThis, PBLDPROGSTRING pStr)
473	{
474	char szNew[BLDPROG_STRTAB_MAX_STRLEN * 2];
475	char *pszDst = szNew;
476	const char *pszSrc = pStr->pszString;
477	const char *pszSrcEnd = pszSrc + pStr->cchString;
478
479	char ch;
480	while ((ch = *pszSrc) != '\0')
481	{
482	const char * const pszSrcUncompressed = pszSrc;
483	size_t cchWord = bldProgStrTab_compressorFindNextWord(pszSrc, ch, &pszSrc);
484	size_t cchSrcUncompressed = pszSrc - pszSrcUncompressed;
485	if (cchSrcUncompressed > 0)
486	{
487	pszDst = bldProgStrTab_compressorCopyAndEscape(pszDst, pszSrcUncompressed, cchSrcUncompressed);
488	if (!pszDst)
489	return false;
490	}
491	if (!cchWord)
492	break;
493
494	/* Check for g_aWord matches. */
495	size_t cchMax = pszSrcEnd - pszSrc;
496	for (unsigned i = 0; i < RT_ELEMENTS(pThis->aCompDict); i++)
497	{
498	size_t cchLen = pThis->aCompDict[i].cchString;
499	if ( cchLen >= cchWord
500	&& cchLen <= cchMax
501	&& memcmp(pThis->aCompDict[i].pszString, pszSrc, cchLen) == 0)
502	{
503	*pszDst++ = (unsigned char)(0x80 \| i);
504	pszSrc += cchLen;
505	cchWord = 0;
506	break;
507	}
508	}
509
510	if (cchWord)
511	{
512	/* Copy the current word. */
513	pszDst = bldProgStrTab_compressorCopyAndEscape(pszDst, pszSrc, cchWord);
514	if (!pszDst)
515	return false;
516	pszSrc += cchWord;
517	}
518	}
519
520	/* Just terminate it now. */
521	*pszDst = '\0';
522
523	/*
524	* Update the string.
525	*/
526	size_t cchNew = pszDst - &szNew[0];
527	if (cchNew > pStr->cchString)
528	{
529	pStr->pszString = (char *)malloc(cchNew + 1);
530	if (!pStr->pszString)
531	{
532	fprintf(stderr, "Out of memory!\n");
533	return false;
534	}
535	}
536	memcpy(pStr->pszString, szNew, cchNew + 1);
537	pStr->cchString = cchNew;
538
539	return true;
540	}
541
542
543	/**
544	* For sorting the frequency fidning in descending order.
545	*
546	* Comparison operators are put outside to make older gcc versions (like 4.1.1
547	* on lnx64-rel) happy.
548	*/
549	class WordFreqSortEntry
550	{
551	public:
552	BLDPROGWORDFREQPAIR const *m_pPair;
553
554	public:
555	WordFreqSortEntry(BLDPROGWORDFREQPAIR const *pPair) : m_pPair(pPair) {}
556	};
557
558	bool operator == (WordFreqSortEntry const &rLeft, WordFreqSortEntry const &rRight)
559	{
560	return rLeft.m_pPair->second == rRight.m_pPair->second;
561	}
562
563	bool operator < (WordFreqSortEntry const &rLeft, WordFreqSortEntry const &rRight)
564	{
565	return rLeft.m_pPair->second > rRight.m_pPair->second;
566	}
567
568
569	/**
570	* Compresses the vendor and product strings.
571	*
572	* This is very very simple (a lot less work than the string table for
573	* instance).
574	*/
575	static bool bldProgStrTab_compressorDoStringCompression(PBLDPROGSTRTAB pThis, bool fVerbose)
576	{
577	/*
578	* Sort the frequency analyzis result and pick the top 127 ones.
579	*/
580	std::vector<WordFreqSortEntry> SortMap;
581	for (BLDPROGWORDFREQMAP::iterator it = pThis->Frequencies.begin(); it != pThis->Frequencies.end(); ++it)
582	{
583	BLDPROGWORDFREQPAIR const &rPair = *it;
584	SortMap.push_back(WordFreqSortEntry(&rPair));
585	}
586
587	sort(SortMap.begin(), SortMap.end());
588
589	size_t cb = 0;
590	size_t i = 0;
591	for (std::vector<WordFreqSortEntry>::iterator it = SortMap.begin();
592	it != SortMap.end() && i < RT_ELEMENTS(pThis->aCompDict);
593	++it, i++)
594	{
595	pThis->aCompDict[i].cchString = it->m_pPair->first.length();
596	pThis->aCompDict[i].pszString = (char *)malloc(pThis->aCompDict[i].cchString + 1);
597	if (pThis->aCompDict[i].pszString)
598	memcpy(pThis->aCompDict[i].pszString, it->m_pPair->first.c_str(), pThis->aCompDict[i].cchString + 1);
599	else
600	return false;
601	cb += it->m_pPair->second;
602	}
603
604	if (fVerbose)
605	printf("debug: Estimated string compression saving: %u bytes\n", (unsigned)cb);
606
607	/*
608	* Rework the strings.
609	*/
610	size_t cchOld = 0;
611	size_t cchOldMax = 0;
612	size_t cchOldMin = BLDPROG_STRTAB_MAX_STRLEN;
613	size_t cchNew = 0;
614	size_t cchNewMax = 0;
615	size_t cchNewMin = BLDPROG_STRTAB_MAX_STRLEN;
616	i = pThis->cPendingStrings;
617	while (i-- > 0)
618	{
619	PBLDPROGSTRING pCurStr = pThis->papPendingStrings[i];
620	cchOld += pCurStr->cchString;
621	if (pCurStr->cchString > cchOldMax)
622	cchOldMax = pCurStr->cchString;
623	if (pCurStr->cchString < cchOldMin)
624	cchOldMin = pCurStr->cchString;
625
626	if (!bldProgStrTab_compressorFixupString(pThis, pCurStr))
627	return false;
628
629	cchNew += pCurStr->cchString;
630	if (pCurStr->cchString > cchNewMax)
631	cchNewMax = pCurStr->cchString;
632	if (pCurStr->cchString < cchNewMin)
633	cchNewMin = pCurStr->cchString;
634
635	bldProgStrTab_AddStringToHashTab(pThis, pCurStr);
636	}
637
638	/*
639	* Do debug stats.
640	*/
641	if (fVerbose)
642	{
643	for (i = 0; i < RT_ELEMENTS(pThis->aCompDict); i++)
644	cchNew += pThis->aCompDict[i].cchString + 1;
645
646	printf("debug: Strings: original: %u bytes; compressed: %u bytes;", (unsigned)cchOld, (unsigned)cchNew);
647	if (cchNew < cchOld)
648	printf(" saving %u bytes (%u%%)\n", (unsigned)(cchOld - cchNew), (unsigned)((cchOld - cchNew) * 100 / cchOld));
649	else
650	printf(" wasting %u bytes!\n", (unsigned)(cchOld - cchNew));
651	printf("debug: Original string lengths: average %u; min %u; max %u\n",
652	(unsigned)(cchOld / pThis->cPendingStrings), (unsigned)cchOldMin, (unsigned)cchOldMax);
653	printf("debug: Compressed string lengths: average %u; min %u; max %u\n",
654	(unsigned)(cchNew / pThis->cPendingStrings), (unsigned)cchNewMin, (unsigned)cchNewMax);
655	}
656
657	return true;
658	}
659
660	#endif /* BLDPROG_STRTAB_WITH_COMPRESSION */
661
662	/**
663	* Inserts a string into g_apUniqueStrings.
664	* @param pThis The strint table compiler instance.
665	* @param pStr The string.
666	*/
667	static void bldProgStrTab_InsertUniqueString(PBLDPROGSTRTAB pThis, PBLDPROGSTRING pStr)
668	{
669	size_t iIdx;
670	size_t iEnd = pThis->cSortedStrings;
671	if (iEnd)
672	{
673	size_t iStart = 0;
674	for (;;)
675	{
676	iIdx = iStart + (iEnd - iStart) / 2;
677	if (pThis->papSortedStrings[iIdx]->cchString < pStr->cchString)
678	{
679	if (iIdx <= iStart)
680	break;
681	iEnd = iIdx;
682	}
683	else if (pThis->papSortedStrings[iIdx]->cchString > pStr->cchString)
684	{
685	if (++iIdx >= iEnd)
686	break;
687	iStart = iIdx;
688	}
689	else
690	break;
691	}
692
693	if (iIdx != pThis->cSortedStrings)
694	memmove(&pThis->papSortedStrings[iIdx + 1], &pThis->papSortedStrings[iIdx],
695	(pThis->cSortedStrings - iIdx) * sizeof(pThis->papSortedStrings[iIdx]));
696	}
697	else
698	iIdx = 0;
699
700	pThis->papSortedStrings[iIdx] = pStr;
701	pThis->cSortedStrings++;
702	}
703
704
705	/**
706	* Compiles the string table after the string has been added.
707	*
708	* This will save space by dropping string terminators, eliminating duplicates
709	* and try find strings that are sub-strings of others.
710	*
711	* Will initialize the StrRef of all StrTabString instances.
712	*
713	* @returns success indicator (error flagged).
714	* @param pThis The strint table compiler instance.
715	*/
716	static bool BldProgStrTab_CompileIt(PBLDPROGSTRTAB pThis, bool fVerbose)
717	{
718	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
719	/*
720	* Do the compression and add all the compressed strings to the table.
721	*/
722	if (!bldProgStrTab_compressorDoStringCompression(pThis, fVerbose))
723	return false;
724
725	/*
726	* Add the dictionary strings.
727	*/
728	for (unsigned i = 0; i < RT_ELEMENTS(pThis->aCompDict); i++)
729	bldProgStrTab_AddStringToHashTab(pThis, &pThis->aCompDict[i]);
730	#endif
731	if (fVerbose)
732	printf("debug: %u unique strings (%u bytes), %u duplicates, %u collisions\n",
733	(unsigned)pThis->cUniqueStrings, (unsigned)pThis->cchUniqueStrings,
734	(unsigned)pThis->cDuplicateStrings, (unsigned)pThis->cCollisions);
735
736	/*
737	* Create papSortedStrings from the hash table. The table is sorted by
738	* string length, with the longer strings first.
739	*/
740	pThis->papSortedStrings = (PBLDPROGSTRING )malloc(sizeof(pThis->papSortedStrings[0]) pThis->cUniqueStrings);
741	if (!pThis->papSortedStrings)
742	return false;
743	pThis->cSortedStrings = 0;
744	size_t idxHash = pThis->cStrHash;
745	while (idxHash-- > 0)
746	{
747	PBLDPROGSTRING pCur = pThis->papStrHash[idxHash];
748	if (pCur)
749	{
750	do
751	{
752	bldProgStrTab_InsertUniqueString(pThis, pCur);
753	pCur = pCur->pNextCollision;
754	} while (pCur);
755	}
756	}
757
758	/*
759	* Create the actual string table.
760	*/
761	pThis->pachStrTab = (char *)malloc(pThis->cchUniqueStrings + 1);
762	if (!pThis->pachStrTab)
763	return false;
764	pThis->cchStrTab = 0;
765	for (size_t i = 0; i < pThis->cSortedStrings; i++)
766	{
767	PBLDPROGSTRING pCur = pThis->papSortedStrings[i];
768	const char * const pszCur = pCur->pszString;
769	size_t const cchCur = pCur->cchString;
770	size_t offStrTab = pThis->cchStrTab;
771
772	/*
773	* See if the string is a substring already found in the string table.
774	* Excluding the zero terminator increases the chances for this.
775	*/
776	size_t cchLeft = pThis->cchStrTab >= cchCur ? pThis->cchStrTab - cchCur : 0;
777	const char *pchLeft = pThis->pachStrTab;
778	char const chFirst = *pszCur;
779	while (cchLeft > 0)
780	{
781	const char pchCandidate = (const char )memchr(pchLeft, chFirst, cchLeft);
782	if (!pchCandidate)
783	break;
784	if (memcmp(pchCandidate, pszCur, cchCur) == 0)
785	{
786	offStrTab = pchCandidate - pThis->pachStrTab;
787	break;
788	}
789
790	cchLeft -= pchCandidate + 1 - pchLeft;
791	pchLeft = pchCandidate + 1;
792	}
793
794	if (offStrTab == pThis->cchStrTab)
795	{
796	/*
797	* See if the start of the string overlaps the end of the string table.
798	*/
799	if (pThis->cchStrTab && cchCur > 1)
800	{
801	cchLeft = RT_MIN(pThis->cchStrTab, cchCur - 1);
802	pchLeft = &pThis->pachStrTab[pThis->cchStrTab - cchLeft];
803	while (cchLeft > 0)
804	{
805	const char pchCandidate = (const char )memchr(pchLeft, chFirst, cchLeft);
806	if (!pchCandidate)
807	break;
808	cchLeft -= pchCandidate - pchLeft;
809	pchLeft = pchCandidate;
810	if (memcmp(pchLeft, pszCur, cchLeft) == 0)
811	{
812	size_t cchToCopy = cchCur - cchLeft;
813	memcpy(&pThis->pachStrTab[offStrTab], &pszCur[cchLeft], cchToCopy);
814	pThis->cchStrTab += cchToCopy;
815	offStrTab = pchCandidate - pThis->pachStrTab;
816	break;
817	}
818	cchLeft--;
819	pchLeft++;
820	}
821	}
822
823	/*
824	* If we didn't have any luck above, just append the string.
825	*/
826	if (offStrTab == pThis->cchStrTab)
827	{
828	memcpy(&pThis->pachStrTab[offStrTab], pszCur, cchCur);
829	pThis->cchStrTab += cchCur;
830	}
831	}
832
833	/*
834	* Set the string table offset for all the references to this string.
835	*/
836	do
837	{
838	pCur->offStrTab = (uint32_t)offStrTab;
839	pCur = pCur->pNextRef;
840	} while (pCur != NULL);
841	}
842
843	if (fVerbose)
844	printf("debug: String table: %u bytes\n", (unsigned)pThis->cchStrTab);
845	return true;
846	}
847
848
849	#ifdef RT_STRICT
850	/**
851	* Sanity checks a string table string.
852	* @param pThis The strint table compiler instance.
853	* @param pStr The string to check.
854	*/
855	static void BldProgStrTab_CheckStrTabString(PBLDPROGSTRTAB pThis, PBLDPROGSTRING pStr)
856	{
857	if (pStr->cchString != strlen(pStr->pszString))
858	abort();
859	if (pStr->offStrTab >= pThis->cchStrTab)
860	abort();
861	if (pStr->offStrTab + pStr->cchString > pThis->cchStrTab)
862	abort();
863	if (memcmp(pStr->pszString, &pThis->pachStrTab[pStr->offStrTab], pStr->cchString) != 0)
864	abort();
865	}
866	#endif
867
868
869	/**
870	* Output the string table string in C string litteral fashion.
871	*
872	* @param pThis The strint table instance.
873	* @param pString The string to print.
874	* @param pOut The output stream.
875	*/
876	static void BldProgStrTab_PrintCStringLitteral(PBLDPROGSTRTAB pThis, PBLDPROGSTRING pString, FILE *pOut)
877	{
878	const unsigned char psz = (const unsigned char )pString->pszString;
879	unsigned char uch;
880	while ((uch = *psz++) != '\0')
881	{
882	if (!(uch & 0x80))
883	{
884	if (uch != '\'' && uch != '\\')
885	fputc((char)uch, pOut);
886	else
887	{
888	fputc('\\', pOut);
889	fputc((char)uch, pOut);
890	}
891	}
892	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
893	else if (uch != 0xff)
894	fputs(pThis->aCompDict[uch & 0x7f].pszString, pOut);
895	else
896	{
897	# ifdef BLDPROG_STRTAB_PURE_ASCII
898	abort();
899	# else
900	RTUNICP uc = RTStrGetCp((const char *)psz);
901	psz += RTStrCpSize(uc);
902	fprintf(pOut, "\\u%04x", uc);
903	# endif
904	}
905	#else
906	else
907	fprintf(pOut, "\\x%02x", (unsigned)uch);
908	NOREF(pThis);
909	#endif
910	}
911	}
912
913
914	/**
915	* Writes the string table code to the output stream.
916	*
917	* @param pThis The strint table compiler instance.
918	* @param pOut The output stream.
919	* @param pszScope The scoping ("static " or empty string),
920	* including trailing space.
921	* @param pszPrefix The variable prefix. Typically "g_" for C programs,
922	* whereas C++ classes normally use "class::s_g".
923	* @param pszBaseName The base name for the variables. The user
924	* accessible variable will end up as just the
925	* prefix and basename concatenated.
926	*/
927	static void BldProgStrTab_WriteStringTable(PBLDPROGSTRTAB pThis, FILE *pOut,
928	const char pszScope, const char pszPrefix, const char *pszBaseName)
929	{
930	#ifdef RT_STRICT
931	/*
932	* Do some quick sanity checks while we're here.
933	*/
934	# ifdef BLDPROG_STRTAB_WITH_COMPRESSION
935	for (unsigned i = 0; i < RT_ELEMENTS(pThis->aCompDict); i++)
936	BldProgStrTab_CheckStrTabString(pThis, &pThis->aCompDict[i]);
937	# endif
938	#endif
939
940	/*
941	* Create a table for speeding up the character categorization.
942	*/
943	uint8_t abCharCat[256];
944	memset(abCharCat, 0, sizeof(abCharCat));
945	abCharCat[(unsigned char)'\\'] = 1;
946	abCharCat[(unsigned char)'\''] = 1;
947	for (unsigned i = 0; i < 0x20; i++)
948	abCharCat[i] = 2;
949	for (unsigned i = 0x7f; i < 0x100; i++)
950	abCharCat[i] = 2;
951
952	/*
953	* We follow the sorted string table, one string per line.
954	*/
955	fprintf(pOut,
956	"#include <iprt/bldprog-strtab.h>\n"
957	"\n"
958	"static const char g_achStrTab%s[] =\n"
959	"{\n",
960	pszBaseName);
961
962	uint32_t off = 0;
963	for (uint32_t i = 0; i < pThis->cSortedStrings; i++)
964	{
965	PBLDPROGSTRING pCur = pThis->papSortedStrings[i];
966	uint32_t offEnd = pCur->offStrTab + (uint32_t)pCur->cchString;
967	if (offEnd > off)
968	{
969	/* Comment with a uncompressed and more readable version of the string. */
970	fprintf(pOut, off == pCur->offStrTab ? "/* 0x%05x = \"" : "/* 0X%05x = \"", off);
971	BldProgStrTab_PrintCStringLitteral(pThis, pCur, pOut);
972	fputs("\" */\n", pOut);
973
974	/* Must use char by char here or we may trigger the max string
975	length limit in the compiler, */
976	fputs(" ", pOut);
977	for (; off < offEnd; off++)
978	{
979	unsigned char uch = pThis->pachStrTab[off];
980	fputc('\'', pOut);
981	if (abCharCat[uch] == 0)
982	fputc(uch, pOut);
983	else if (abCharCat[uch] != 1)
984	fprintf(pOut, "\\x%02x", (unsigned)uch);
985	else
986	{
987	fputc('\\', pOut);
988	fputc(uch, pOut);
989	}
990	fputc('\'', pOut);
991	fputc(',', pOut);
992	}
993	fputc('\n', pOut);
994	}
995	}
996
997	fprintf(pOut,
998	"};\n"
999	"AssertCompile(sizeof(g_achStrTab%s) == %#x);\n\n",
1000	pszBaseName, (unsigned)pThis->cchStrTab);
1001
1002	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
1003	/*
1004	* Write the compression dictionary.
1005	*/
1006	fprintf(pOut,
1007	"static const RTBLDPROGSTRREF g_aCompDict%s[%u] = \n"
1008	"{\n",
1009	pszBaseName, (unsigned)RT_ELEMENTS(pThis->aCompDict));
1010	for (unsigned i = 0; i < RT_ELEMENTS(pThis->aCompDict); i++)
1011	fprintf(pOut, " { %#08x, %#04x }, // %s\n",
1012	pThis->aCompDict[i].offStrTab, (unsigned)pThis->aCompDict[i].cchString, pThis->aCompDict[i].pszString);
1013	fprintf(pOut, "};\n\n");
1014	#endif
1015
1016
1017	/*
1018	* Write the string table data structure.
1019	*/
1020	fprintf(pOut,
1021	"%sconst RTBLDPROGSTRTAB %s%s = \n"
1022	"{\n"
1023	" /.pchStrTab = / &g_achStrTab%s[0],\n"
1024	" /.cchStrTab = / sizeof(g_achStrTab%s),\n"
1025	,
1026	pszScope, pszPrefix, pszBaseName, pszBaseName, pszBaseName);
1027	#ifdef BLDPROG_STRTAB_WITH_COMPRESSION
1028	fprintf(pOut,
1029	" /.cCompDict = / %u,\n"
1030	" /.paCompDict = / &g_aCompDict%s[0]\n"
1031	"};\n"
1032	, (unsigned)RT_ELEMENTS(pThis->aCompDict), pszBaseName);
1033	#else
1034	fprintf(pOut,
1035	" /.cCompDict = / 0,\n"
1036	" /.paCompDict = / NULL\n"
1037	"};\n");
1038	#endif
1039	}
1040
1041	#if RT_CLANG_PREREQ(4, 0) \|\| RT_GNUC_PREREQ(4, 6)
1042	# pragma GCC diagnostic pop
1043	#endif
1044
1045	#endif /* __cplusplus && IN_RING3 */
1046

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source: vbox/trunk/include/iprt/bldprog-strtab-template.cpp.h@ 81732

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