VBoxCompilerPlugInsGcc.cpp@ 87247

Last change on this file since 87247 was 85502, checked in by vboxsync, 4 years ago
gccplugin: gcc 10 fixes. bugref:9746
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1	/* $Id: VBoxCompilerPlugInsGcc.cpp 85502 2020-07-29 09:52:10Z vboxsync $ */
2	/** @file
3	* gccplugin - GCC plugin for checking IPRT format strings.
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#include <stdio.h>
23	#include <iprt/cdefs.h>
24	#include <iprt/stdarg.h>
25
26	#if RT_GNUC_PREREQ(5, 1)
27	# include "gcc-plugin.h"
28	# include "plugin-version.h"
29	#endif
30	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
31	# include "gmp.h"
32	extern "C" {
33	#endif
34	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
35	# include "coretypes.h"
36	#endif
37	#include "plugin.h"
38	#include "basic-block.h"
39	#include "tree.h"
40	#include "tree-pass.h"
41	#if __GNUC__ == 5 && __GNUC_MINOR__ == 4
42	# include "tree-ssa-alias.h"
43	# include "gimple-expr.h"
44	#endif
45	#include "gimple.h"
46	#if RT_GNUC_PREREQ(4, 9)
47	# include "gimple-iterator.h"
48	# include "context.h" /* for g */
49	#endif
50	#include "cp/cp-tree.h"
51	#if RT_GNUC_PREREQ(10, 0)
52	# include "stringpool.h"
53	# include "attribs.h"
54	#endif
55	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
56	}
57	#endif
58
59	#include "VBoxCompilerPlugIns.h"
60
61
62	/*********************************************************************************************************************************
63	* Global Variables *
64	*********************************************************************************************************************************/
65	/** License indicator. */
66	int plugin_is_GPL_compatible;
67
68
69	/*********************************************************************************************************************************
70	* Defined Constants And Macros *
71	*********************************************************************************************************************************/
72	/** Convencience macro not present in earlier gcc versions. */
73	#ifndef VAR_P
74	# define VAR_P(a_hNode) (TREE_CODE(a_hNode) == VAR_DECL)
75	#endif
76	/** Replacement for the 4.9.0 get_tree_code_name function. */
77	#if !RT_GNUC_PREREQ(4, 9)
78	# define get_tree_code_name(a_enmTreeCode) (tree_code_name[a_enmTreeCode])
79	#endif
80
81
82	/** For use with messages.
83	* @todo needs some more work... Actually, seems we're a bit handicapped by
84	* working on gimplified stuff. */
85	#define MY_LOC(a_hPreferred, a_pState) EXPR_LOC_OR_LOC(a_hPreferred, (a_pState)->hFmtLoc)
86
87	/** @name Compatibility glue
88	* @{ */
89	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
90	# define linemap_location_from_macro_expansion_p(a, b) false
91	#endif
92	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
93	static tree gimple_call_fntype(gimple hStmt)
94	{
95	tree hDecl = gimple_call_fndecl(hStmt);
96	if (hDecl)
97	return TREE_TYPE(hDecl);
98	hDecl = gimple_call_fn(hStmt);
99	if (TREE_CODE(hDecl) == OBJ_TYPE_REF)
100	hDecl = OBJ_TYPE_REF_EXPR(hDecl);
101	if (DECL_P(hDecl))
102	{
103	tree hType = TREE_TYPE(hDecl);
104	if (POINTER_TYPE_P(hType))
105	hType = TREE_TYPE(hType);
106	return hType;
107	}
108	return NULL_TREE; /* caller bitches about this*/
109	}
110	#endif
111
112	///* Integer to HOST_WIDE_INT conversion fun. */
113	//#if RT_GNUC_PREREQ(4, 6)
114	//# define MY_INT_FITS_SHWI(hNode) (hNode).fits_shwi()
115	//# define MY_INT_TO_SHWI(hNode) (hNode).to_shwi()
116	//#else
117	//# define MY_INT_FITS_SHWI(hNode) double_int_fits_in_shwi_p(hNode)
118	//# define MY_INT_TO_SHWI(hNode) double_int_to_shwi(hNode)
119	//#endif
120
121	/* Integer to HOST_WIDE_INT conversion fun. */
122	#if RT_GNUC_PREREQ(5, 1)
123	# define MY_DOUBLE_INT_FITS_SHWI(hNode) tree_fits_shwi_p(hNode)
124	# define MY_DOUBLE_INT_TO_SHWI(hNode) tree_to_shwi(hNode)
125	#elif RT_GNUC_PREREQ(4, 6)
126	# define MY_DOUBLE_INT_FITS_SHWI(hNode) (TREE_INT_CST(hNode).fits_shwi())
127	# define MY_DOUBLE_INT_TO_SHWI(hNode) (TREE_INT_CST(hNode).to_shwi())
128	#else
129	# define MY_DOUBLE_INT_FITS_SHWI(hNode) double_int_fits_in_shwi_p(TREE_INT_CST(hNode))
130	# define MY_DOUBLE_INT_TO_SHWI(hNode) double_int_to_shwi(TREE_INT_CST(hNode))
131	#endif
132
133	#ifndef EXPR_LOC_OR_LOC
134	# define EXPR_LOC_OR_LOC(a,b) (b)
135	#endif
136	/** @} */
137
138
139	/*********************************************************************************************************************************
140	* Internal Functions *
141	*********************************************************************************************************************************/
142	static bool MyPassGateCallback(void);
143	static unsigned int MyPassExecuteCallback(void);
144	static unsigned int MyPassExecuteCallbackWithFunction(struct function *pFun);
145	static tree AttributeHandler(tree , tree, tree, int, bool );
146
147
148	/*********************************************************************************************************************************
149	* Global Variables *
150	*********************************************************************************************************************************/
151	/** Plug-in info. */
152	static const struct plugin_info g_PlugInInfo =
153	{
154	version: "0.0.0-ALPHA",
155	help : "Implements the __iprt_format__ attribute for checking format strings and arguments."
156	};
157
158	#if RT_GNUC_PREREQ(4, 9)
159
160	/** My pass. */
161	static const pass_data g_MyPassData =
162	{
163	type : GIMPLE_PASS,
164	name : "iprt-format-checks", / asterisk = no dump */
165	# if RT_GNUC_PREREQ(10, 0)
166	optinfo_flags : OPTGROUP_NONE,
167	# else
168	optinfo_flags : 0,
169	# endif
170	tv_id : TV_NONE,
171	properties_required : 0,
172	properties_provided : 0,
173	properties_destroyed : 0,
174	todo_flags_start : 0,
175	todo_flags_finish : 0,
176	};
177
178	class MyPass : public gimple_opt_pass
179	{
180	public:
181	MyPass(gcc::context *pCtx) : gimple_opt_pass(g_MyPassData, pCtx)
182	{ }
183
184	virtual bool gate(function *pFun)
185	{
186	NOREF(pFun);
187	return MyPassGateCallback();
188	}
189
190	virtual unsigned int execute(function *pFun)
191	{
192	NOREF(pFun);
193	return MyPassExecuteCallbackWithFunction(pFun);
194	}
195	};
196
197	#else /* < 4.9.0 */
198
199	/** My pass. */
200	static struct gimple_opt_pass g_MyPass =
201	{
202	pass:
203	{
204	type : GIMPLE_PASS,
205	name : "iprt-format-checks", / asterisk = no dump */
206	# if RT_GNUC_PREREQ(4, 6)
207	optinfo_flags : 0,
208	# endif
209	gate : MyPassGateCallback,
210	execute : MyPassExecuteCallback,
211	sub : NULL,
212	next : NULL,
213	static_pass_number : 0,
214	tv_id : TV_NONE,
215	properties_required : 0,
216	properties_provided : 0,
217	properties_destroyed : 0,
218	todo_flags_start : 0,
219	todo_flags_finish : 0,
220	}
221	};
222
223	/** The registration info for my pass. */
224	static const struct register_pass_info g_MyPassInfo =
225	{
226	pass : &g_MyPass.pass,
227	reference_pass_name : "ssa",
228	ref_pass_instance_number : 1,
229	pos_op : PASS_POS_INSERT_BEFORE,
230	};
231
232	#endif /* < 4.9.0 */
233
234
235	/** Attribute specifications. */
236	static const struct attribute_spec g_AttribSpecs[] =
237	{
238	{
239	name : "iprt_format",
240	min_length : 2,
241	max_length : 2,
242	decl_required : false,
243	type_required : true,
244	function_type_required : true,
245	# if RT_GNUC_PREREQ(4, 6)
246	affects_type_identity : false,
247	#endif
248	handler : AttributeHandler,
249	# if RT_GNUC_PREREQ(10, 0)
250	exclude : NULL,
251	# endif
252	},
253	{
254	name : "iprt_format_maybe_null",
255	min_length : 2,
256	max_length : 2,
257	decl_required : false,
258	type_required : true,
259	function_type_required : true,
260	# if RT_GNUC_PREREQ(4, 6)
261	affects_type_identity : false,
262	#endif
263	handler : AttributeHandler,
264	# if RT_GNUC_PREREQ(10, 0)
265	exclude : NULL,
266	# endif
267	}
268	};
269
270
271	#ifdef DEBUG
272
273	/**
274	* Debug function for printing the scope of a decl.
275	* @param hDecl Declaration to print scope for.
276	*/
277	static void dprintScope(tree hDecl)
278	{
279	# if 0 /* later? */
280	tree hScope = CP_DECL_CONTEXT(hDecl);
281	if (hScope == global_namespace)
282	return;
283	if (TREE_CODE(hScope) == RECORD_TYPE)
284	hScope = TYPE_NAME(hScope);
285
286	/* recurse */
287	dprintScope(hScope);
288
289	/* name the scope. */
290	dprintf("::%s", DECL_NAME(hScope) ? IDENTIFIER_POINTER(DECL_NAME(hScope)) : "<noname>");
291	# endif
292	}
293
294
295	/**
296	* Debug function for printing a declaration.
297	* @param hDecl The declaration to print.
298	*/
299	static void dprintDecl(tree hDecl)
300	{
301	enum tree_code const enmDeclCode = TREE_CODE(hDecl);
302	tree const hType = TREE_TYPE(hDecl);
303	enum tree_code const enmTypeCode = hType ? TREE_CODE(hType) : (enum tree_code)-1;
304	#if 0
305	if ( enmTypeCode == RECORD_TYPE
306	&& enmDeclCode == TYPE_DECL
307	&& DECL_ARTIFICIAL(hDecl))
308	dprint_class(hType);
309	#endif
310
311	dprintf("%s ", get_tree_code_name(enmDeclCode));
312	dprintScope(hDecl);
313	dprintf("::%s", DECL_NAME(hDecl) ? IDENTIFIER_POINTER(DECL_NAME(hDecl)) : "<noname>");
314	if (hType)
315	dprintf(" type %s", get_tree_code_name(enmTypeCode));
316	dprintf(" @%s:%d", DECL_SOURCE_FILE(hDecl), DECL_SOURCE_LINE(hDecl));
317	}
318
319	#endif /* DEBUG */
320
321
322	static location_t MyGetLocationPlusColumnOffset(location_t hLoc, unsigned int offColumn)
323	{
324	/*
325	* Skip NOOPs, reserved locations and macro expansion.
326	*/
327	if ( offColumn != 0
328	&& hLoc >= RESERVED_LOCATION_COUNT
329	&& !linemap_location_from_macro_expansion_p(line_table, hLoc))
330	{
331	#if __GNUC__ >= 5 /** @todo figure this... */
332	/*
333	* There is an API for doing this, nice.
334	*/
335	location_t hNewLoc = linemap_position_for_loc_and_offset(line_table, hLoc, offColumn);
336	if (hNewLoc && hNewLoc != hLoc)
337	{
338	dprintf("MyGetLocationPlusColumnOffset: hNewLoc=%#x hLoc=%#x offColumn=%u\n", hNewLoc, hLoc, offColumn);
339	return hNewLoc;
340	}
341
342	#elif __GNUC_MINOR__ > 5
343	/*
344	* Have to do the job ourselves, it seems. This is a bit hairy...
345	*/
346	line_map const *pMap = NULL;
347	location_t hLoc2 = linemap_resolve_location(line_table, hLoc, LRK_SPELLING_LOCATION, &pMap);
348	if (hLoc2)
349	hLoc = hLoc2;
350
351	/* Guard against wrap arounds and overlaps. */
352	if ( hLoc + offColumn > MAP_START_LOCATION(pMap) /** @todo Use MAX_SOURCE_LOCATION? */
353	&& ( pMap == LINEMAPS_LAST_ORDINARY_MAP(line_table)
354	\|\| hLoc + offColumn < MAP_START_LOCATION((pMap + 1))))
355	{
356	/* Calc new column and check that it's within the valid range. */
357	unsigned int uColumn = SOURCE_COLUMN(pMap, hLoc) + offColumn;
358	if (uColumn < RT_BIT_32(ORDINARY_MAP_NUMBER_OF_COLUMN_BITS(pMap)))
359	{
360	/* Try add the position. If we get a valid result, replace the location. */
361	source_location hNewLoc = linemap_position_for_line_and_column((line_map *)pMap, SOURCE_LINE(pMap, hLoc), uColumn);
362	if ( hNewLoc <= line_table->highest_location
363	&& linemap_lookup(line_table, hNewLoc) != NULL)
364	{
365	dprintf("MyGetLocationPlusColumnOffset: hNewLoc=%#x hLoc=%#x offColumn=%u uColumn=%u\n",
366	hNewLoc, hLoc, offColumn, uColumn);
367	return hNewLoc;
368	}
369	}
370	}
371	#endif
372	}
373	dprintf("MyGetLocationPlusColumnOffset: taking fallback\n");
374	return hLoc;
375	}
376
377
378	#if 0
379	DECLINLINE(int) MyGetLineLength(const char *pszLine)
380	{
381	if (pszLine)
382	{
383	const char *pszEol = strpbrk(pszLine, "\n\r");
384	if (!pszEol)
385	pszEol = strchr(pszLine, '\0');
386	return (int)(pszEol - pszLine);
387	}
388	return 0;
389	}
390	#endif
391
392	static location_t MyGetFormatStringLocation(PVFMTCHKSTATE pState, const char *pszLoc)
393	{
394	location_t hLoc = pState->hFmtLoc;
395	#if RT_GNUC_PREREQ(4,6)
396	intptr_t offString = pszLoc - pState->pszFmt;
397	if ( offString >= 0
398	&& !linemap_location_from_macro_expansion_p(line_table, hLoc))
399	{
400	unsigned uCol = 1 + offString;
401	# if 0 /* apparently not needed */
402	expanded_location XLoc = expand_location_to_spelling_point(hLoc);
403	# if RT_GNUC_PREREQ(10,0)
404	char_span Span = location_get_source_line(XLoc.file, XLoc.line);
405	const char pszLine = Span.m_ptr; /* @todo if enabled */
406	int cchLine = (int)Span.m_n_elts;
407	# elif RT_GNUC_PREREQ(6,0)
408	int cchLine = 0;
409	const char *pszLine = location_get_source_line(XLoc.file, XLoc.line, &cchLine);
410	# elif RT_GNUC_PREREQ(5,0)
411	int cchLine = 0;
412	const char *pszLine = location_get_source_line(XLoc, &cchLine);
413	# else
414	const char *pszLine = location_get_source_line(XLoc);
415	int cchLine = MyGetLineLength(pszLine);
416	# endif
417	if (pszLine)
418	{
419	/** @todo Adjust the position by parsing the source. */
420	pszLine += XLoc.column - 1;
421	cchLine -= XLoc.column - 1;
422	}
423	# endif
424
425	hLoc = MyGetLocationPlusColumnOffset(hLoc, uCol);
426	}
427	#endif
428	return hLoc;
429	}
430
431
432	/**
433	* Non-recursive worker for MyCheckFormatRecursive.
434	*
435	* This will attempt to result @a hFmtArg into a string literal which it then
436	* passes on to MyCheckFormatString for the actual analyzis.
437	*
438	* @param pState The format string checking state.
439	* @param hFmtArg The format string node.
440	*/
441	DECL_NO_INLINE(static, void) MyCheckFormatNonRecursive(PVFMTCHKSTATE pState, tree hFmtArg)
442	{
443	dprintf("checker: hFmtArg=%p %s\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)));
444
445	/*
446	* Try resolve variables into constant strings.
447	*/
448	if (VAR_P(hFmtArg))
449	{
450	hFmtArg = decl_constant_value(hFmtArg);
451	STRIP_NOPS(hFmtArg); /* Used as argument and assigned call result. */
452	dprintf("checker1: variable => hFmtArg=%p %s\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)));
453	}
454
455	/*
456	* Fend off NULLs.
457	*/
458	if (integer_zerop(hFmtArg))
459	{
460	if (pState->fMaybeNull)
461	VFmtChkVerifyEndOfArgs(pState, 0);
462	else
463	error_at(MY_LOC(hFmtArg, pState), "Format string should not be NULL");
464	}
465	/*
466	* Need address expression to get any further.
467	*/
468	else if (TREE_CODE(hFmtArg) != ADDR_EXPR)
469	dprintf("checker1: Not address expression (%s)\n", get_tree_code_name(TREE_CODE(hFmtArg)));
470	else
471	{
472	pState->hFmtLoc = EXPR_LOC_OR_LOC(hFmtArg, pState->hFmtLoc);
473	hFmtArg = TREE_OPERAND(hFmtArg, 0);
474
475	/*
476	* Deal with fixed string indexing, if possible.
477	*/
478	HOST_WIDE_INT off = 0;
479	if ( TREE_CODE(hFmtArg) == ARRAY_REF
480	&& MY_DOUBLE_INT_FITS_SHWI(TREE_OPERAND(hFmtArg, 1))
481	&& MY_DOUBLE_INT_FITS_SHWI(TREE_OPERAND(hFmtArg, 1)) )
482	{
483	off = MY_DOUBLE_INT_TO_SHWI(TREE_OPERAND(hFmtArg, 1));
484	if (off < 0)
485	{
486	dprintf("checker1: ARRAY_REF, off=%ld\n", off);
487	return;
488	}
489	hFmtArg = TREE_OPERAND(hFmtArg, 0);
490	dprintf("checker1: ARRAY_REF => hFmtArg=%p %s, off=%ld\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)), off);
491	}
492
493	/*
494	* Deal with static const char g_szFmt[] = "qwerty"; Take care as
495	* the actual string constant may not necessarily include the terminator.
496	*/
497	tree hArraySize = NULL_TREE;
498	if ( VAR_P(hFmtArg)
499	&& TREE_CODE(TREE_TYPE(hFmtArg)) == ARRAY_TYPE)
500	{
501	tree hArrayInitializer = decl_constant_value(hFmtArg);
502	if ( hArrayInitializer != hFmtArg
503	&& TREE_CODE(hArrayInitializer) == STRING_CST)
504	{
505	hArraySize = DECL_SIZE_UNIT(hFmtArg);
506	hFmtArg = hArrayInitializer;
507	}
508	}
509
510	/*
511	* Are we dealing with a string literal now?
512	*/
513	if (TREE_CODE(hFmtArg) != STRING_CST)
514	dprintf("checker1: Not string literal (%s)\n", get_tree_code_name(TREE_CODE(hFmtArg)));
515	else if (TYPE_MAIN_VARIANT(TREE_TYPE(TREE_TYPE(hFmtArg))) != char_type_node)
516	warning_at(pState->hFmtLoc, 0, "expected 'char' type string literal");
517	else
518	{
519	/*
520	* Yes we are, so get the pointer to the string and its length.
521	*/
522	const char *pszFmt = TREE_STRING_POINTER(hFmtArg);
523	int cchFmt = TREE_STRING_LENGTH(hFmtArg);
524
525	/* Adjust cchFmt to the initialized array size if appropriate. */
526	if (hArraySize != NULL_TREE)
527	{
528	if (TREE_CODE(hArraySize) != INTEGER_CST)
529	warning_at(pState->hFmtLoc, 0, "Expected integer array size (not %s)", get_tree_code_name(TREE_CODE(hArraySize)));
530	else if (!MY_DOUBLE_INT_FITS_SHWI(hArraySize))
531	warning_at(pState->hFmtLoc, 0, "Unexpected integer overflow in array size constant");
532	else
533	{
534	HOST_WIDE_INT cbArray = MY_DOUBLE_INT_TO_SHWI(hArraySize);
535	if ( cbArray <= 0
536	\|\| cbArray != (int)cbArray)
537	warning_at(pState->hFmtLoc, 0, "Unexpected integer array size constant value: %ld", cbArray);
538	else if (cchFmt > cbArray)
539	{
540	dprintf("checker1: cchFmt=%d => cchFmt=%ld (=cbArray)\n", cchFmt, cbArray);
541	cchFmt = (int)cbArray;
542	}
543	}
544	}
545
546	/* Apply the offset, if given. */
547	if (off)
548	{
549	if (off >= cchFmt)
550	{
551	dprintf("checker1: off=%ld >= cchFmt=%d -> skipping\n", off, cchFmt);
552	return;
553	}
554	pszFmt += off;
555	cchFmt -= (int)off;
556	}
557
558	/*
559	* Check for unterminated strings.
560	*/
561	if ( cchFmt < 1
562	\|\| pszFmt[cchFmt - 1] != '\0')
563	warning_at(pState->hFmtLoc, 0, "Unterminated format string (cchFmt=%d)", cchFmt);
564	/*
565	* Call worker to check the actual string.
566	*/
567	else
568	MyCheckFormatCString(pState, pszFmt);
569	}
570	}
571	}
572
573
574	/**
575	* Deal recursively with special format string constructs.
576	*
577	* This will call MyCheckFormatNonRecursive to validate each format string.
578	*
579	* @param pState The format string checking state.
580	* @param hFmtArg The format string node.
581	*/
582	static void MyCheckFormatRecursive(PVFMTCHKSTATE pState, tree hFmtArg)
583	{
584	/*
585	* Catch wrong attribute use.
586	*/
587	if (hFmtArg == NULL_TREE)
588	error_at(pState->hFmtLoc, "IPRT format attribute is probably used incorrectly (hFmtArg is NULL)");
589	/*
590	* NULL format strings may cause crashes.
591	*/
592	else if (integer_zerop(hFmtArg))
593	{
594	if (pState->fMaybeNull)
595	VFmtChkVerifyEndOfArgs(pState, 0);
596	else
597	error_at(MY_LOC(hFmtArg, pState), "Format string should not be NULL");
598	}
599	/*
600	* Check both branches of a ternary operator.
601	*/
602	else if (TREE_CODE(hFmtArg) == COND_EXPR)
603	{
604	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 1));
605	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 2));
606	}
607	/*
608	* Strip coercion.
609	*/
610	else if ( CONVERT_EXPR_P(hFmtArg)
611	&& TYPE_PRECISION(TREE_TYPE(hFmtArg)) == TYPE_PRECISION(TREE_TYPE(TREE_OPERAND(hFmtArg, 0))) )
612	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 0));
613	/*
614	* We're good, hand it to the non-recursive worker.
615	*/
616	else
617	MyCheckFormatNonRecursive(pState, hFmtArg);
618	}
619
620
621	#if !RT_GNUC_PREREQ(4, 9)
622	/**
623	* Execute my pass.
624	* @returns Flags indicates stuff todo, we return 0.
625	*/
626	static unsigned int MyPassExecuteCallback(void)
627	{
628	return MyPassExecuteCallbackWithFunction(cfun);
629	}
630	#endif
631
632	/**
633	* Execute my pass.
634	* @returns Flags indicates stuff todo, we return 0.
635	*/
636	static unsigned int MyPassExecuteCallbackWithFunction(struct function *pFun)
637	{
638	dprintf("MyPassExecuteCallback:\n");
639
640	/*
641	* Enumerate the basic blocks.
642	*/
643	basic_block hBasicBlock;
644	FOR_EACH_BB_FN(hBasicBlock, pFun)
645	{
646	dprintf(" hBasicBlock=%p\n", hBasicBlock);
647
648	/*
649	* Enumerate the statements in the current basic block.
650	* We're interested in calls to functions with the __iprt_format__ attribute.
651	*/
652	for (gimple_stmt_iterator hStmtItr = gsi_start_bb(hBasicBlock); !gsi_end_p(hStmtItr); gsi_next(&hStmtItr))
653	{
654	#if RT_GNUC_PREREQ(6, 0)
655	const gimple * const hStmt = gsi_stmt(hStmtItr);
656	#else
657	gimple const hStmt = gsi_stmt(hStmtItr);
658	#endif
659
660	enum gimple_code const enmCode = gimple_code(hStmt);
661	#ifdef DEBUG
662	unsigned const cOps = gimple_num_ops(hStmt);
663	dprintf(" hStmt=%p %s (%d) ops=%d\n", hStmt, gimple_code_name[enmCode], enmCode, cOps);
664	for (unsigned iOp = 0; iOp < cOps; iOp++)
665	{
666	tree const hOp = gimple_op(hStmt, iOp);
667	if (hOp)
668	dprintf(" %02d: %p, code %s(%d)\n", iOp, hOp, get_tree_code_name(TREE_CODE(hOp)), TREE_CODE(hOp));
669	else
670	dprintf(" %02d: NULL_TREE\n", iOp);
671	}
672	#endif
673	if (enmCode == GIMPLE_CALL)
674	{
675	/*
676	* Check if the function type has the __iprt_format__ attribute.
677	*/
678	tree const hFn = gimple_call_fn(hStmt);
679	dprintf(" hFn =%p %s(%d); args=%d\n",
680	hFn, hFn ? get_tree_code_name(TREE_CODE(hFn)) : NULL, hFn ? TREE_CODE(hFn) : - 1,
681	gimple_call_num_args(hStmt));
682	#ifdef DEBUG
683	if (hFn && DECL_P(hFn))
684	dprintf(" hFn is decl: %s %s:%d\n",
685	DECL_NAME(hFn) ? IDENTIFIER_POINTER(DECL_NAME(hFn)) : "<unamed>",
686	DECL_SOURCE_FILE(hFn), DECL_SOURCE_LINE(hFn));
687	#endif
688	tree const hFnDecl = gimple_call_fndecl(hStmt);
689	if (hFnDecl)
690	dprintf(" hFnDecl=%p %s(%d) %s type=%p %s:%d\n",
691	hFnDecl, get_tree_code_name(TREE_CODE(hFnDecl)), TREE_CODE(hFnDecl),
692	DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
693	TREE_TYPE(hFnDecl), DECL_SOURCE_FILE(hFnDecl), DECL_SOURCE_LINE(hFnDecl));
694	tree const hFnType = gimple_call_fntype(hStmt);
695	if (hFnType == NULL_TREE)
696	{
697	if ( hFnDecl == NULL_TREE
698	&& gimple_call_internal_p(hStmt) /* va_arg() kludge */)
699	continue;
700	error_at(gimple_location(hStmt), "Failed to resolve function type [fn=%s fndecl=%s]\n",
701	hFn ? get_tree_code_name(TREE_CODE(hFn)) : "<null>",
702	hFnDecl ? get_tree_code_name(TREE_CODE(hFnDecl)) : "<null>");
703	}
704	else if (POINTER_TYPE_P(hFnType))
705	error_at(gimple_location(hStmt), "Got a POINTER_TYPE when expecting a function type [fn=%s]\n",
706	get_tree_code_name(TREE_CODE(hFn)));
707	if (hFnType)
708	dprintf(" hFnType=%p %s(%d) %s\n", hFnType, get_tree_code_name(TREE_CODE(hFnType)), TREE_CODE(hFnType),
709	TYPE_NAME(hFnType) && DECL_NAME(TYPE_NAME(hFnType))
710	? IDENTIFIER_POINTER(DECL_NAME(TYPE_NAME(hFnType))) : "<unamed>");
711
712	tree const hAttr = hFnType ? lookup_attribute("iprt_format", TYPE_ATTRIBUTES(hFnType)) : NULL_TREE;
713	tree const hAttrMaybe0 = hFnType ? lookup_attribute("iprt_format_maybe_null", TYPE_ATTRIBUTES(hFnType)) : NULL_TREE;
714	if (hAttr \|\| hAttrMaybe0)
715	{
716	/*
717	* Yeah, it has the attribute!
718	*/
719	tree const hAttrArgs = hAttr ? TREE_VALUE(hAttr) : TREE_VALUE(hAttrMaybe0);
720	VFMTCHKSTATE State;
721	State.iFmt = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
722	State.iArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
723	State.pszFmt = NULL;
724	State.fMaybeNull = hAttr == NULL_TREE;
725	State.hStmt = hStmt;
726	State.hFmtLoc = gimple_location(hStmt);
727	dprintf(" %s() __iprt_format%s__(iFmt=%ld, iArgs=%ld)\n",
728	hFnDecl && DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
729	State.fMaybeNull ? "_maybe_null" : "", State.iFmt, State.iArgs);
730
731	unsigned cCallArgs = gimple_call_num_args(hStmt);
732	if (cCallArgs >= State.iFmt)
733	MyCheckFormatRecursive(&State, gimple_call_arg(hStmt, State.iFmt - 1));
734	else
735	error_at(gimple_location(hStmt),
736	"Call has only %d arguments; %s() format string is argument #%lu (1-based), thus missing\n",
737	cCallArgs, DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>", State.iFmt);
738	}
739	}
740	}
741	}
742	return 0;
743	}
744
745
746	/**
747	* Gate callback for my pass that indicates whether it should execute or not.
748	* @returns true to execute.
749	*/
750	static bool MyPassGateCallback(void)
751	{
752	dprintf("MyPassGateCallback:\n");
753	return true;
754	}
755
756
757	/**
758	* Validate the use of an attribute.
759	*
760	* @returns ??
761	* @param phOnNode The node the attribute is being used on.
762	* @param hAttrName The attribute name.
763	* @param hAttrArgs The attribute arguments.
764	* @param fFlags Some kind of flags...
765	* @param pfDontAddAttrib Whether to add the attribute to this node or not.
766	*/
767	static tree AttributeHandler(tree phOnNode, tree hAttrName, tree hAttrArgs, int fFlags, bool pfDontAddAttrib)
768	{
769	dprintf("AttributeHandler: name=%s fFlags=%#x", IDENTIFIER_POINTER(hAttrName), fFlags);
770	long iFmt = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
771	long iArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
772	dprintf(" iFmt=%ld iArgs=%ld", iFmt, iArgs);
773
774	tree hType = *phOnNode;
775	dprintf(" hType=%p %s(%d)\n", hType, get_tree_code_name(TREE_CODE(hType)), TREE_CODE(hType));
776
777	if (pfDontAddAttrib)
778	*pfDontAddAttrib = false;
779	return NULL_TREE;
780	}
781
782
783	/**
784	* Called when we can register attributes.
785	*
786	* @param pvEventData Ignored.
787	* @param pvUser Ignored.
788	*/
789	static void RegisterAttributesEvent(void pvEventData, void pvUser)
790	{
791	NOREF(pvEventData); NOREF(pvUser);
792	dprintf("RegisterAttributesEvent: pvEventData=%p\n", pvEventData);
793
794	register_attribute(&g_AttribSpecs[0]);
795	register_attribute(&g_AttribSpecs[1]);
796	}
797
798
799	/**
800	* The plug-in entry point.
801	*
802	* @returns 0 to indicate success?
803	* @param pPlugInInfo Plugin info structure.
804	* @param pGccVer GCC Version.
805	*/
806	int plugin_init(plugin_name_args pPlugInInfo, plugin_gcc_version pGccVer)
807	{
808	dprintf("plugin_init: %s\n", pPlugInInfo->full_name);
809	dprintf("gcc version: basever=%s datestamp=%s devphase=%s revision=%s\n",
810	pGccVer->basever, pGccVer->datestamp, pGccVer->devphase, pGccVer->revision);
811
812	/* Ask for callback in which we may register the attribute. */
813	register_callback(pPlugInInfo->base_name, PLUGIN_ATTRIBUTES, RegisterAttributesEvent, NULL /pvUser/);
814
815	/* Register our pass. */
816	#if RT_GNUC_PREREQ(4, 9)
817	/** The registration info for my pass. */
818	struct register_pass_info MyPassInfo;
819	MyPassInfo.pass = new MyPass(g);
820	MyPassInfo.reference_pass_name = "ssa";
821	MyPassInfo.ref_pass_instance_number = 1;
822	MyPassInfo.pos_op = PASS_POS_INSERT_BEFORE;
823	register_callback(pPlugInInfo->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &MyPassInfo);
824	#else
825	register_callback(pPlugInInfo->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, (void *)&g_MyPassInfo);
826	#endif
827
828	/* Register plug-in info. */
829	register_callback(pPlugInInfo->base_name, PLUGIN_INFO, NULL, (void *)&g_PlugInInfo);
830
831	return 0;
832	}
833
834
835
836
837	/*
838	*
839	* Functions used by the common code.
840	* Functions used by the common code.
841	* Functions used by the common code.
842	*
843	*/
844
845	void VFmtChkWarnFmt(PVFMTCHKSTATE pState, const char pszLoc, const char pszFormat, ...)
846	{
847	char szTmp[1024];
848	va_list va;
849	va_start(va, pszFormat);
850	vsnprintf(szTmp, sizeof(szTmp), pszFormat, va);
851	va_end(va);
852
853	/* display the warning. */
854	warning_at(MyGetFormatStringLocation(pState, pszLoc), 0, "%s", szTmp);
855	}
856
857
858	void VFmtChkErrFmt(PVFMTCHKSTATE pState, const char pszLoc, const char pszFormat, ...)
859	{
860	char szTmp[1024];
861	va_list va;
862	va_start(va, pszFormat);
863	vsnprintf(szTmp, sizeof(szTmp), pszFormat, va);
864	va_end(va);
865
866	/* display the warning. */
867	error_at(MyGetFormatStringLocation(pState, pszLoc), "%s", szTmp);
868	}
869
870
871
872	void VFmtChkVerifyEndOfArgs(PVFMTCHKSTATE pState, unsigned iArg)
873	{
874	dprintf("VFmtChkVerifyEndOfArgs: iArg=%u iArgs=%ld cArgs=%u\n", iArg, pState->iArgs, gimple_call_num_args(pState->hStmt));
875	if (pState->iArgs > 0)
876	{
877	iArg += pState->iArgs - 1;
878	unsigned cArgs = gimple_call_num_args(pState->hStmt);
879	if (iArg == cArgs)
880	{ /* fine */ }
881	else if (iArg < cArgs)
882	{
883	tree hArg = gimple_call_arg(pState->hStmt, iArg);
884	if (cArgs - iArg > 1)
885	error_at(MY_LOC(hArg, pState), "%u extra arguments not consumed by format string", cArgs - iArg);
886	else if ( TREE_CODE(hArg) != INTEGER_CST
887	\|\| !MY_DOUBLE_INT_FITS_SHWI(hArg)
888	\|\| MY_DOUBLE_INT_TO_SHWI(hArg) != -99) /* ignore final dummy argument: ..., -99); */
889	error_at(MY_LOC(hArg, pState), "one extra argument not consumed by format string");
890	}
891	/* This should be handled elsewhere, but just in case. */
892	else if (iArg - 1 == cArgs)
893	error_at(pState->hFmtLoc, "one argument too few");
894	else
895	error_at(pState->hFmtLoc, "%u arguments too few", iArg - cArgs);
896	}
897	}
898
899
900	bool VFmtChkRequirePresentArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
901	{
902	if (pState->iArgs > 0)
903	{
904	iArg += pState->iArgs - 1;
905	unsigned cArgs = gimple_call_num_args(pState->hStmt);
906	if (iArg >= cArgs)
907	{
908	VFmtChkErrFmt(pState, pszLoc, "Missing argument! %s", pszMessage);
909	return false;
910	}
911
912	tree hArg = gimple_call_arg(pState->hStmt, iArg);
913	tree hType = TREE_TYPE(hArg);
914	dprintf("arg%u: hArg=%p [%s] hType=%p [%s] cls=%s\n", iArg, hArg, get_tree_code_name(TREE_CODE(hArg)),
915	hType, get_tree_code_name(TREE_CODE(hType)), tree_code_class_strings[TREE_CODE_CLASS(TREE_CODE(hType))]);
916	dprintf(" nm=%p\n", TYPE_NAME(hType));
917	dprintf(" cb=%p %s value=%ld\n", TYPE_SIZE(hType), get_tree_code_name(TREE_CODE(TYPE_SIZE(hType))),
918	MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE(hType)) );
919	dprintf(" unit=%p %s value=%ld\n", TYPE_SIZE_UNIT(hType), get_tree_code_name(TREE_CODE(TYPE_SIZE_UNIT(hType))),
920	MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE_UNIT(hType)) );
921	tree hTypeNm = TYPE_NAME(hType);
922	if (hTypeNm)
923	dprintf(" typenm=%p %s '%s'\n", hTypeNm, get_tree_code_name(TREE_CODE(hTypeNm)),
924	IDENTIFIER_POINTER(DECL_NAME(hTypeNm)));
925	}
926	return true;
927	}
928
929
930	bool VFmtChkRequireIntArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
931	{
932	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
933	{
934	/** @todo type check. */
935	return true;
936	}
937	return false;
938	}
939
940
941	bool VFmtChkRequireStringArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
942	{
943	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
944	{
945	/** @todo type check. */
946	return true;
947	}
948	return false;
949	}
950
951
952	bool VFmtChkRequireVaListPtrArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
953	{
954	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
955	{
956	/** @todo type check. */
957	return true;
958	}
959	return false;
960	}
961
962
963	void VFmtChkHandleReplacementFormatString(PVFMTCHKSTATE pState, const char *pszPctM, unsigned iArg)
964	{
965	if (pState->iArgs > 0)
966	{
967	pState->iFmt = pState->iArgs + iArg;
968	pState->iArgs = pState->iFmt + 1;
969	pState->fMaybeNull = false;
970	MyCheckFormatRecursive(pState, gimple_call_arg(pState->hStmt, pState->iFmt - 1));
971	}
972	}
973
974
975	const char *VFmtChkGetFmtLocFile(PVFMTCHKSTATE pState)
976	{
977	return LOCATION_FILE(pState->hFmtLoc);
978	}
979
980
981	unsigned int VFmtChkGetFmtLocLine(PVFMTCHKSTATE pState)
982	{
983	return LOCATION_LINE(pState->hFmtLoc);
984	}
985
986
987	unsigned int VFmtChkGetFmtLocColumn(PVFMTCHKSTATE pState)
988	{
989	#ifdef LOCATION_COLUMN
990	return LOCATION_COLUMN(pState->hFmtLoc);
991	#else
992	return 1;
993	#endif
994	}
995

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source: vbox/trunk/src/bldprogs/VBoxCompilerPlugInsGcc.cpp@ 87247

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