VBoxCompilerPlugInsGcc.cpp@ 100111

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1	/* $Id: VBoxCompilerPlugInsGcc.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* gccplugin - GCC plugin for checking IPRT format strings.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#include <stdio.h>
33	#include <iprt/cdefs.h>
34	#include <iprt/stdarg.h>
35
36	#if RT_GNUC_PREREQ(5, 1)
37	# include "gcc-plugin.h"
38	# include "plugin-version.h"
39	#endif
40	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
41	# include "gmp.h"
42	extern "C" {
43	#endif
44	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
45	# include "coretypes.h"
46	#endif
47	#include "plugin.h"
48	#include "basic-block.h"
49	#include "tree.h"
50	#include "tree-pass.h"
51	#if __GNUC__ == 5 && __GNUC_MINOR__ == 4
52	# include "tree-ssa-alias.h"
53	# include "gimple-expr.h"
54	#endif
55	#include "gimple.h"
56	#if RT_GNUC_PREREQ(4, 9)
57	# include "gimple-iterator.h"
58	# include "context.h" /* for g */
59	#endif
60	#include "cp/cp-tree.h"
61	#if RT_GNUC_PREREQ(10, 0)
62	# include "stringpool.h"
63	# include "attribs.h"
64	#endif
65	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
66	}
67	#endif
68
69	#include "VBoxCompilerPlugIns.h"
70
71
72	/*********************************************************************************************************************************
73	* Global Variables *
74	*********************************************************************************************************************************/
75	/** License indicator. */
76	int plugin_is_GPL_compatible;
77
78
79	/*********************************************************************************************************************************
80	* Defined Constants And Macros *
81	*********************************************************************************************************************************/
82	/** Convencience macro not present in earlier gcc versions. */
83	#ifndef VAR_P
84	# define VAR_P(a_hNode) (TREE_CODE(a_hNode) == VAR_DECL)
85	#endif
86	/** Replacement for the 4.9.0 get_tree_code_name function. */
87	#if !RT_GNUC_PREREQ(4, 9)
88	# define get_tree_code_name(a_enmTreeCode) (tree_code_name[a_enmTreeCode])
89	#endif
90
91
92	/** For use with messages.
93	* @todo needs some more work... Actually, seems we're a bit handicapped by
94	* working on gimplified stuff. */
95	#define MY_LOC(a_hPreferred, a_pState) EXPR_LOC_OR_LOC(a_hPreferred, (a_pState)->hFmtLoc)
96
97	/** @name Compatibility glue
98	* @{ */
99	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
100	# define linemap_location_from_macro_expansion_p(a, b) false
101	#endif
102	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
103	static tree gimple_call_fntype(gimple hStmt)
104	{
105	tree hDecl = gimple_call_fndecl(hStmt);
106	if (hDecl)
107	return TREE_TYPE(hDecl);
108	hDecl = gimple_call_fn(hStmt);
109	if (TREE_CODE(hDecl) == OBJ_TYPE_REF)
110	hDecl = OBJ_TYPE_REF_EXPR(hDecl);
111	if (DECL_P(hDecl))
112	{
113	tree hType = TREE_TYPE(hDecl);
114	if (POINTER_TYPE_P(hType))
115	hType = TREE_TYPE(hType);
116	return hType;
117	}
118	return NULL_TREE; /* caller bitches about this*/
119	}
120	#endif
121
122	///* Integer to HOST_WIDE_INT conversion fun. */
123	//#if RT_GNUC_PREREQ(4, 6)
124	//# define MY_INT_FITS_SHWI(hNode) (hNode).fits_shwi()
125	//# define MY_INT_TO_SHWI(hNode) (hNode).to_shwi()
126	//#else
127	//# define MY_INT_FITS_SHWI(hNode) double_int_fits_in_shwi_p(hNode)
128	//# define MY_INT_TO_SHWI(hNode) double_int_to_shwi(hNode)
129	//#endif
130
131	/* Integer to HOST_WIDE_INT conversion fun. */
132	#if RT_GNUC_PREREQ(5, 1)
133	# define MY_DOUBLE_INT_FITS_SHWI(hNode) tree_fits_shwi_p(hNode)
134	# define MY_DOUBLE_INT_TO_SHWI(hNode) tree_to_shwi(hNode)
135	#elif RT_GNUC_PREREQ(4, 6)
136	# define MY_DOUBLE_INT_FITS_SHWI(hNode) (TREE_INT_CST(hNode).fits_shwi())
137	# define MY_DOUBLE_INT_TO_SHWI(hNode) (TREE_INT_CST(hNode).to_shwi())
138	#else
139	# define MY_DOUBLE_INT_FITS_SHWI(hNode) double_int_fits_in_shwi_p(TREE_INT_CST(hNode))
140	# define MY_DOUBLE_INT_TO_SHWI(hNode) double_int_to_shwi(TREE_INT_CST(hNode))
141	#endif
142
143	#ifndef EXPR_LOC_OR_LOC
144	# define EXPR_LOC_OR_LOC(a,b) (b)
145	#endif
146	/** @} */
147
148
149	/*********************************************************************************************************************************
150	* Internal Functions *
151	*********************************************************************************************************************************/
152	static bool MyPassGateCallback(void);
153	static unsigned int MyPassExecuteCallback(void);
154	static unsigned int MyPassExecuteCallbackWithFunction(struct function *pFun);
155	static tree AttributeHandler(tree , tree, tree, int, bool );
156
157
158	/*********************************************************************************************************************************
159	* Global Variables *
160	*********************************************************************************************************************************/
161	/** Plug-in info. */
162	static const struct plugin_info g_PlugInInfo =
163	{
164	version: "0.0.0-ALPHA",
165	help : "Implements the __iprt_format__ attribute for checking format strings and arguments."
166	};
167
168	#if RT_GNUC_PREREQ(4, 9)
169
170	/** My pass. */
171	static const pass_data g_MyPassData =
172	{
173	type : GIMPLE_PASS,
174	name : "iprt-format-checks", / asterisk = no dump */
175	# if RT_GNUC_PREREQ(10, 0)
176	optinfo_flags : OPTGROUP_NONE,
177	# else
178	optinfo_flags : 0,
179	# endif
180	tv_id : TV_NONE,
181	properties_required : 0,
182	properties_provided : 0,
183	properties_destroyed : 0,
184	todo_flags_start : 0,
185	todo_flags_finish : 0,
186	};
187
188	class MyPass : public gimple_opt_pass
189	{
190	public:
191	MyPass(gcc::context *pCtx) : gimple_opt_pass(g_MyPassData, pCtx)
192	{ }
193
194	virtual bool gate(function *pFun)
195	{
196	NOREF(pFun);
197	return MyPassGateCallback();
198	}
199
200	virtual unsigned int execute(function *pFun)
201	{
202	NOREF(pFun);
203	return MyPassExecuteCallbackWithFunction(pFun);
204	}
205	};
206
207	#else /* < 4.9.0 */
208
209	/** My pass. */
210	static struct gimple_opt_pass g_MyPass =
211	{
212	pass:
213	{
214	type : GIMPLE_PASS,
215	name : "iprt-format-checks", / asterisk = no dump */
216	# if RT_GNUC_PREREQ(4, 6)
217	optinfo_flags : 0,
218	# endif
219	gate : MyPassGateCallback,
220	execute : MyPassExecuteCallback,
221	sub : NULL,
222	next : NULL,
223	static_pass_number : 0,
224	tv_id : TV_NONE,
225	properties_required : 0,
226	properties_provided : 0,
227	properties_destroyed : 0,
228	todo_flags_start : 0,
229	todo_flags_finish : 0,
230	}
231	};
232
233	/** The registration info for my pass. */
234	static const struct register_pass_info g_MyPassInfo =
235	{
236	pass : &g_MyPass.pass,
237	reference_pass_name : "ssa",
238	ref_pass_instance_number : 1,
239	pos_op : PASS_POS_INSERT_BEFORE,
240	};
241
242	#endif /* < 4.9.0 */
243
244
245	/** Attribute specifications. */
246	static const struct attribute_spec g_AttribSpecs[] =
247	{
248	{
249	name : "iprt_format",
250	min_length : 2,
251	max_length : 2,
252	decl_required : false,
253	type_required : true,
254	function_type_required : true,
255	// gcc 7.3 at least moves this field to after "handler", and with 8.3 it is back
256	#if RT_GNUC_PREREQ(4, 6) && !(RT_GNUC_PREREQ(7, 0) && !RT_GNUC_PREREQ(8, 0))
257	affects_type_identity : false,
258	#endif
259	handler : AttributeHandler,
260	#if RT_GNUC_PREREQ(7, 0) && !RT_GNUC_PREREQ(8, 0)
261	affects_type_identity : false,
262	#endif
263	#if RT_GNUC_PREREQ(8, 0)
264	exclude : NULL,
265	#endif
266	},
267	{
268	name : "iprt_format_maybe_null",
269	min_length : 2,
270	max_length : 2,
271	decl_required : false,
272	type_required : true,
273	function_type_required : true,
274	#if RT_GNUC_PREREQ(4, 6) && !(RT_GNUC_PREREQ(7, 0) && !RT_GNUC_PREREQ(8, 0))
275	affects_type_identity : false,
276	#endif
277	handler : AttributeHandler,
278	#if RT_GNUC_PREREQ(7, 0) && !RT_GNUC_PREREQ(8, 0)
279	affects_type_identity : false,
280	#endif
281	#if RT_GNUC_PREREQ(8, 0)
282	exclude : NULL,
283	#endif
284	}
285	};
286
287
288	#ifdef DEBUG
289
290	/**
291	* Debug function for printing the scope of a decl.
292	* @param hDecl Declaration to print scope for.
293	*/
294	static void dprintScope(tree hDecl)
295	{
296	# if 0 /* later? */
297	tree hScope = CP_DECL_CONTEXT(hDecl);
298	if (hScope == global_namespace)
299	return;
300	if (TREE_CODE(hScope) == RECORD_TYPE)
301	hScope = TYPE_NAME(hScope);
302
303	/* recurse */
304	dprintScope(hScope);
305
306	/* name the scope. */
307	dprintf("::%s", DECL_NAME(hScope) ? IDENTIFIER_POINTER(DECL_NAME(hScope)) : "<noname>");
308	# endif
309	}
310
311
312	/**
313	* Debug function for printing a declaration.
314	* @param hDecl The declaration to print.
315	*/
316	static void dprintDecl(tree hDecl)
317	{
318	enum tree_code const enmDeclCode = TREE_CODE(hDecl);
319	tree const hType = TREE_TYPE(hDecl);
320	enum tree_code const enmTypeCode = hType ? TREE_CODE(hType) : (enum tree_code)-1;
321	#if 0
322	if ( enmTypeCode == RECORD_TYPE
323	&& enmDeclCode == TYPE_DECL
324	&& DECL_ARTIFICIAL(hDecl))
325	dprint_class(hType);
326	#endif
327
328	dprintf("%s ", get_tree_code_name(enmDeclCode));
329	dprintScope(hDecl);
330	dprintf("::%s", DECL_NAME(hDecl) ? IDENTIFIER_POINTER(DECL_NAME(hDecl)) : "<noname>");
331	if (hType)
332	dprintf(" type %s", get_tree_code_name(enmTypeCode));
333	dprintf(" @%s:%d", DECL_SOURCE_FILE(hDecl), DECL_SOURCE_LINE(hDecl));
334	}
335
336	#endif /* DEBUG */
337
338
339	static location_t MyGetLocationPlusColumnOffset(location_t hLoc, unsigned int offColumn)
340	{
341	/*
342	* Skip NOOPs, reserved locations and macro expansion.
343	*/
344	if ( offColumn != 0
345	&& hLoc >= RESERVED_LOCATION_COUNT
346	&& !linemap_location_from_macro_expansion_p(line_table, hLoc))
347	{
348	#if __GNUC__ >= 5 /** @todo figure this... */
349	/*
350	* There is an API for doing this, nice.
351	*/
352	location_t hNewLoc = linemap_position_for_loc_and_offset(line_table, hLoc, offColumn);
353	if (hNewLoc && hNewLoc != hLoc)
354	{
355	dprintf("MyGetLocationPlusColumnOffset: hNewLoc=%#x hLoc=%#x offColumn=%u\n", hNewLoc, hLoc, offColumn);
356	return hNewLoc;
357	}
358
359	#elif __GNUC_MINOR__ > 5
360	/*
361	* Have to do the job ourselves, it seems. This is a bit hairy...
362	*/
363	line_map const *pMap = NULL;
364	location_t hLoc2 = linemap_resolve_location(line_table, hLoc, LRK_SPELLING_LOCATION, &pMap);
365	if (hLoc2)
366	hLoc = hLoc2;
367
368	/* Guard against wrap arounds and overlaps. */
369	if ( hLoc + offColumn > MAP_START_LOCATION(pMap) /** @todo Use MAX_SOURCE_LOCATION? */
370	&& ( pMap == LINEMAPS_LAST_ORDINARY_MAP(line_table)
371	\|\| hLoc + offColumn < MAP_START_LOCATION((pMap + 1))))
372	{
373	/* Calc new column and check that it's within the valid range. */
374	unsigned int uColumn = SOURCE_COLUMN(pMap, hLoc) + offColumn;
375	if (uColumn < RT_BIT_32(ORDINARY_MAP_NUMBER_OF_COLUMN_BITS(pMap)))
376	{
377	/* Try add the position. If we get a valid result, replace the location. */
378	source_location hNewLoc = linemap_position_for_line_and_column((line_map *)pMap, SOURCE_LINE(pMap, hLoc), uColumn);
379	if ( hNewLoc <= line_table->highest_location
380	&& linemap_lookup(line_table, hNewLoc) != NULL)
381	{
382	dprintf("MyGetLocationPlusColumnOffset: hNewLoc=%#x hLoc=%#x offColumn=%u uColumn=%u\n",
383	hNewLoc, hLoc, offColumn, uColumn);
384	return hNewLoc;
385	}
386	}
387	}
388	#endif
389	}
390	dprintf("MyGetLocationPlusColumnOffset: taking fallback\n");
391	return hLoc;
392	}
393
394
395	#if 0
396	DECLINLINE(int) MyGetLineLength(const char *pszLine)
397	{
398	if (pszLine)
399	{
400	const char *pszEol = strpbrk(pszLine, "\n\r");
401	if (!pszEol)
402	pszEol = strchr(pszLine, '\0');
403	return (int)(pszEol - pszLine);
404	}
405	return 0;
406	}
407	#endif
408
409	static location_t MyGetFormatStringLocation(PVFMTCHKSTATE pState, const char *pszLoc)
410	{
411	location_t hLoc = pState->hFmtLoc;
412	#if RT_GNUC_PREREQ(4,6)
413	intptr_t offString = pszLoc - pState->pszFmt;
414	if ( offString >= 0
415	&& !linemap_location_from_macro_expansion_p(line_table, hLoc))
416	{
417	unsigned uCol = 1 + offString;
418	# if 0 /* apparently not needed */
419	expanded_location XLoc = expand_location_to_spelling_point(hLoc);
420	# if RT_GNUC_PREREQ(10,0)
421	char_span Span = location_get_source_line(XLoc.file, XLoc.line);
422	const char pszLine = Span.m_ptr; /* @todo if enabled */
423	int cchLine = (int)Span.m_n_elts;
424	# elif RT_GNUC_PREREQ(6,0)
425	int cchLine = 0;
426	const char *pszLine = location_get_source_line(XLoc.file, XLoc.line, &cchLine);
427	# elif RT_GNUC_PREREQ(5,0)
428	int cchLine = 0;
429	const char *pszLine = location_get_source_line(XLoc, &cchLine);
430	# else
431	const char *pszLine = location_get_source_line(XLoc);
432	int cchLine = MyGetLineLength(pszLine);
433	# endif
434	if (pszLine)
435	{
436	/** @todo Adjust the position by parsing the source. */
437	pszLine += XLoc.column - 1;
438	cchLine -= XLoc.column - 1;
439	}
440	# endif
441
442	hLoc = MyGetLocationPlusColumnOffset(hLoc, uCol);
443	}
444	#endif
445	return hLoc;
446	}
447
448
449	/**
450	* Non-recursive worker for MyCheckFormatRecursive.
451	*
452	* This will attempt to result @a hFmtArg into a string literal which it then
453	* passes on to MyCheckFormatString for the actual analyzis.
454	*
455	* @param pState The format string checking state.
456	* @param hFmtArg The format string node.
457	*/
458	DECL_NO_INLINE(static, void) MyCheckFormatNonRecursive(PVFMTCHKSTATE pState, tree hFmtArg)
459	{
460	dprintf("checker: hFmtArg=%p %s\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)));
461
462	/*
463	* Try resolve variables into constant strings.
464	*/
465	if (VAR_P(hFmtArg))
466	{
467	hFmtArg = decl_constant_value(hFmtArg);
468	STRIP_NOPS(hFmtArg); /* Used as argument and assigned call result. */
469	dprintf("checker1: variable => hFmtArg=%p %s\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)));
470	}
471
472	/*
473	* Fend off NULLs.
474	*/
475	if (integer_zerop(hFmtArg))
476	{
477	if (pState->fMaybeNull)
478	VFmtChkVerifyEndOfArgs(pState, 0);
479	else
480	error_at(MY_LOC(hFmtArg, pState), "Format string should not be NULL");
481	}
482	/*
483	* Need address expression to get any further.
484	*/
485	else if (TREE_CODE(hFmtArg) != ADDR_EXPR)
486	dprintf("checker1: Not address expression (%s)\n", get_tree_code_name(TREE_CODE(hFmtArg)));
487	else
488	{
489	pState->hFmtLoc = EXPR_LOC_OR_LOC(hFmtArg, pState->hFmtLoc);
490	hFmtArg = TREE_OPERAND(hFmtArg, 0);
491
492	/*
493	* Deal with fixed string indexing, if possible.
494	*/
495	HOST_WIDE_INT off = 0;
496	if ( TREE_CODE(hFmtArg) == ARRAY_REF
497	&& MY_DOUBLE_INT_FITS_SHWI(TREE_OPERAND(hFmtArg, 1))
498	&& MY_DOUBLE_INT_FITS_SHWI(TREE_OPERAND(hFmtArg, 1)) )
499	{
500	off = MY_DOUBLE_INT_TO_SHWI(TREE_OPERAND(hFmtArg, 1));
501	if (off < 0)
502	{
503	dprintf("checker1: ARRAY_REF, off=%ld\n", off);
504	return;
505	}
506	hFmtArg = TREE_OPERAND(hFmtArg, 0);
507	dprintf("checker1: ARRAY_REF => hFmtArg=%p %s, off=%ld\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)), off);
508	}
509
510	/*
511	* Deal with static const char g_szFmt[] = "qwerty"; Take care as
512	* the actual string constant may not necessarily include the terminator.
513	*/
514	tree hArraySize = NULL_TREE;
515	if ( VAR_P(hFmtArg)
516	&& TREE_CODE(TREE_TYPE(hFmtArg)) == ARRAY_TYPE)
517	{
518	tree hArrayInitializer = decl_constant_value(hFmtArg);
519	if ( hArrayInitializer != hFmtArg
520	&& TREE_CODE(hArrayInitializer) == STRING_CST)
521	{
522	hArraySize = DECL_SIZE_UNIT(hFmtArg);
523	hFmtArg = hArrayInitializer;
524	}
525	}
526
527	/*
528	* Are we dealing with a string literal now?
529	*/
530	if (TREE_CODE(hFmtArg) != STRING_CST)
531	dprintf("checker1: Not string literal (%s)\n", get_tree_code_name(TREE_CODE(hFmtArg)));
532	else if (TYPE_MAIN_VARIANT(TREE_TYPE(TREE_TYPE(hFmtArg))) != char_type_node)
533	warning_at(pState->hFmtLoc, 0, "expected 'char' type string literal");
534	else
535	{
536	/*
537	* Yes we are, so get the pointer to the string and its length.
538	*/
539	const char *pszFmt = TREE_STRING_POINTER(hFmtArg);
540	int cchFmt = TREE_STRING_LENGTH(hFmtArg);
541
542	/* Adjust cchFmt to the initialized array size if appropriate. */
543	if (hArraySize != NULL_TREE)
544	{
545	if (TREE_CODE(hArraySize) != INTEGER_CST)
546	warning_at(pState->hFmtLoc, 0, "Expected integer array size (not %s)", get_tree_code_name(TREE_CODE(hArraySize)));
547	else if (!MY_DOUBLE_INT_FITS_SHWI(hArraySize))
548	warning_at(pState->hFmtLoc, 0, "Unexpected integer overflow in array size constant");
549	else
550	{
551	HOST_WIDE_INT cbArray = MY_DOUBLE_INT_TO_SHWI(hArraySize);
552	if ( cbArray <= 0
553	\|\| cbArray != (int)cbArray)
554	warning_at(pState->hFmtLoc, 0, "Unexpected integer array size constant value: %ld", cbArray);
555	else if (cchFmt > cbArray)
556	{
557	dprintf("checker1: cchFmt=%d => cchFmt=%ld (=cbArray)\n", cchFmt, cbArray);
558	cchFmt = (int)cbArray;
559	}
560	}
561	}
562
563	/* Apply the offset, if given. */
564	if (off)
565	{
566	if (off >= cchFmt)
567	{
568	dprintf("checker1: off=%ld >= cchFmt=%d -> skipping\n", off, cchFmt);
569	return;
570	}
571	pszFmt += off;
572	cchFmt -= (int)off;
573	}
574
575	/*
576	* Check for unterminated strings.
577	*/
578	if ( cchFmt < 1
579	\|\| pszFmt[cchFmt - 1] != '\0')
580	warning_at(pState->hFmtLoc, 0, "Unterminated format string (cchFmt=%d)", cchFmt);
581	/*
582	* Call worker to check the actual string.
583	*/
584	else
585	MyCheckFormatCString(pState, pszFmt);
586	}
587	}
588	}
589
590
591	/**
592	* Deal recursively with special format string constructs.
593	*
594	* This will call MyCheckFormatNonRecursive to validate each format string.
595	*
596	* @param pState The format string checking state.
597	* @param hFmtArg The format string node.
598	*/
599	static void MyCheckFormatRecursive(PVFMTCHKSTATE pState, tree hFmtArg)
600	{
601	/*
602	* Catch wrong attribute use.
603	*/
604	if (hFmtArg == NULL_TREE)
605	error_at(pState->hFmtLoc, "IPRT format attribute is probably used incorrectly (hFmtArg is NULL)");
606	/*
607	* NULL format strings may cause crashes.
608	*/
609	else if (integer_zerop(hFmtArg))
610	{
611	if (pState->fMaybeNull)
612	VFmtChkVerifyEndOfArgs(pState, 0);
613	else
614	error_at(MY_LOC(hFmtArg, pState), "Format string should not be NULL");
615	}
616	/*
617	* Check both branches of a ternary operator.
618	*/
619	else if (TREE_CODE(hFmtArg) == COND_EXPR)
620	{
621	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 1));
622	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 2));
623	}
624	/*
625	* Strip coercion.
626	*/
627	else if ( CONVERT_EXPR_P(hFmtArg)
628	&& TYPE_PRECISION(TREE_TYPE(hFmtArg)) == TYPE_PRECISION(TREE_TYPE(TREE_OPERAND(hFmtArg, 0))) )
629	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 0));
630	/*
631	* We're good, hand it to the non-recursive worker.
632	*/
633	else
634	MyCheckFormatNonRecursive(pState, hFmtArg);
635	}
636
637
638	#if !RT_GNUC_PREREQ(4, 9)
639	/**
640	* Execute my pass.
641	* @returns Flags indicates stuff todo, we return 0.
642	*/
643	static unsigned int MyPassExecuteCallback(void)
644	{
645	return MyPassExecuteCallbackWithFunction(cfun);
646	}
647	#endif
648
649	/**
650	* Execute my pass.
651	* @returns Flags indicates stuff todo, we return 0.
652	*/
653	static unsigned int MyPassExecuteCallbackWithFunction(struct function *pFun)
654	{
655	dprintf("MyPassExecuteCallback:\n");
656
657	/*
658	* Enumerate the basic blocks.
659	*/
660	basic_block hBasicBlock;
661	FOR_EACH_BB_FN(hBasicBlock, pFun)
662	{
663	dprintf(" hBasicBlock=%p\n", hBasicBlock);
664
665	/*
666	* Enumerate the statements in the current basic block.
667	* We're interested in calls to functions with the __iprt_format__ attribute.
668	*/
669	for (gimple_stmt_iterator hStmtItr = gsi_start_bb(hBasicBlock); !gsi_end_p(hStmtItr); gsi_next(&hStmtItr))
670	{
671	#if RT_GNUC_PREREQ(6, 0)
672	const gimple * const hStmt = gsi_stmt(hStmtItr);
673	#else
674	gimple const hStmt = gsi_stmt(hStmtItr);
675	#endif
676
677	enum gimple_code const enmCode = gimple_code(hStmt);
678	#ifdef DEBUG
679	unsigned const cOps = gimple_num_ops(hStmt);
680	dprintf(" hStmt=%p %s (%d) ops=%d\n", hStmt, gimple_code_name[enmCode], enmCode, cOps);
681	for (unsigned iOp = 0; iOp < cOps; iOp++)
682	{
683	tree const hOp = gimple_op(hStmt, iOp);
684	if (hOp)
685	dprintf(" %02d: %p, code %s(%d)\n", iOp, hOp, get_tree_code_name(TREE_CODE(hOp)), TREE_CODE(hOp));
686	else
687	dprintf(" %02d: NULL_TREE\n", iOp);
688	}
689	#endif
690	if (enmCode == GIMPLE_CALL)
691	{
692	/*
693	* Check if the function type has the __iprt_format__ attribute.
694	*/
695	tree const hFn = gimple_call_fn(hStmt);
696	dprintf(" hFn =%p %s(%d); args=%d\n",
697	hFn, hFn ? get_tree_code_name(TREE_CODE(hFn)) : NULL, hFn ? TREE_CODE(hFn) : - 1,
698	gimple_call_num_args(hStmt));
699	#ifdef DEBUG
700	if (hFn && DECL_P(hFn))
701	dprintf(" hFn is decl: %s %s:%d\n",
702	DECL_NAME(hFn) ? IDENTIFIER_POINTER(DECL_NAME(hFn)) : "<unamed>",
703	DECL_SOURCE_FILE(hFn), DECL_SOURCE_LINE(hFn));
704	#endif
705	tree const hFnDecl = gimple_call_fndecl(hStmt);
706	if (hFnDecl)
707	dprintf(" hFnDecl=%p %s(%d) %s type=%p %s:%d\n",
708	hFnDecl, get_tree_code_name(TREE_CODE(hFnDecl)), TREE_CODE(hFnDecl),
709	DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
710	TREE_TYPE(hFnDecl), DECL_SOURCE_FILE(hFnDecl), DECL_SOURCE_LINE(hFnDecl));
711	tree const hFnType = gimple_call_fntype(hStmt);
712	if (hFnType == NULL_TREE)
713	{
714	if ( hFnDecl == NULL_TREE
715	&& gimple_call_internal_p(hStmt) /* va_arg() kludge */)
716	continue;
717	error_at(gimple_location(hStmt), "Failed to resolve function type [fn=%s fndecl=%s]\n",
718	hFn ? get_tree_code_name(TREE_CODE(hFn)) : "<null>",
719	hFnDecl ? get_tree_code_name(TREE_CODE(hFnDecl)) : "<null>");
720	}
721	else if (POINTER_TYPE_P(hFnType))
722	error_at(gimple_location(hStmt), "Got a POINTER_TYPE when expecting a function type [fn=%s]\n",
723	get_tree_code_name(TREE_CODE(hFn)));
724	if (hFnType)
725	dprintf(" hFnType=%p %s(%d) %s\n", hFnType, get_tree_code_name(TREE_CODE(hFnType)), TREE_CODE(hFnType),
726	TYPE_NAME(hFnType) && DECL_NAME(TYPE_NAME(hFnType))
727	? IDENTIFIER_POINTER(DECL_NAME(TYPE_NAME(hFnType))) : "<unamed>");
728
729	tree const hAttr = hFnType ? lookup_attribute("iprt_format", TYPE_ATTRIBUTES(hFnType)) : NULL_TREE;
730	tree const hAttrMaybe0 = hFnType ? lookup_attribute("iprt_format_maybe_null", TYPE_ATTRIBUTES(hFnType)) : NULL_TREE;
731	if (hAttr \|\| hAttrMaybe0)
732	{
733	/*
734	* Yeah, it has the attribute!
735	*/
736	tree const hAttrArgs = hAttr ? TREE_VALUE(hAttr) : TREE_VALUE(hAttrMaybe0);
737	VFMTCHKSTATE State;
738	State.iFmt = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
739	State.iArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
740	State.pszFmt = NULL;
741	State.fMaybeNull = hAttr == NULL_TREE;
742	State.hStmt = hStmt;
743	State.hFmtLoc = gimple_location(hStmt);
744	dprintf(" %s() __iprt_format%s__(iFmt=%ld, iArgs=%ld)\n",
745	hFnDecl && DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
746	State.fMaybeNull ? "_maybe_null" : "", State.iFmt, State.iArgs);
747
748	unsigned cCallArgs = gimple_call_num_args(hStmt);
749	if (cCallArgs >= State.iFmt)
750	MyCheckFormatRecursive(&State, gimple_call_arg(hStmt, State.iFmt - 1));
751	else
752	error_at(gimple_location(hStmt),
753	"Call has only %d arguments; %s() format string is argument #%lu (1-based), thus missing\n",
754	cCallArgs, DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>", State.iFmt);
755	}
756	}
757	}
758	}
759	return 0;
760	}
761
762
763	/**
764	* Gate callback for my pass that indicates whether it should execute or not.
765	* @returns true to execute.
766	*/
767	static bool MyPassGateCallback(void)
768	{
769	dprintf("MyPassGateCallback:\n");
770	return true;
771	}
772
773
774	/**
775	* Validate the use of an attribute.
776	*
777	* @returns ??
778	* @param phOnNode The node the attribute is being used on.
779	* @param hAttrName The attribute name.
780	* @param hAttrArgs The attribute arguments.
781	* @param fFlags Some kind of flags...
782	* @param pfDontAddAttrib Whether to add the attribute to this node or not.
783	*/
784	static tree AttributeHandler(tree phOnNode, tree hAttrName, tree hAttrArgs, int fFlags, bool pfDontAddAttrib)
785	{
786	dprintf("AttributeHandler: name=%s fFlags=%#x", IDENTIFIER_POINTER(hAttrName), fFlags);
787	long iFmt = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
788	long iArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
789	dprintf(" iFmt=%ld iArgs=%ld", iFmt, iArgs);
790
791	tree hType = *phOnNode;
792	dprintf(" hType=%p %s(%d)\n", hType, get_tree_code_name(TREE_CODE(hType)), TREE_CODE(hType));
793
794	if (pfDontAddAttrib)
795	*pfDontAddAttrib = false;
796	return NULL_TREE;
797	}
798
799
800	/**
801	* Called when we can register attributes.
802	*
803	* @param pvEventData Ignored.
804	* @param pvUser Ignored.
805	*/
806	static void RegisterAttributesEvent(void pvEventData, void pvUser)
807	{
808	NOREF(pvEventData); NOREF(pvUser);
809	dprintf("RegisterAttributesEvent: pvEventData=%p\n", pvEventData);
810
811	register_attribute(&g_AttribSpecs[0]);
812	register_attribute(&g_AttribSpecs[1]);
813	}
814
815
816	/**
817	* The plug-in entry point.
818	*
819	* @returns 0 to indicate success?
820	* @param pPlugInInfo Plugin info structure.
821	* @param pGccVer GCC Version.
822	*/
823	int plugin_init(plugin_name_args pPlugInInfo, plugin_gcc_version pGccVer)
824	{
825	dprintf("plugin_init: %s\n", pPlugInInfo->full_name);
826	dprintf("gcc version: basever=%s datestamp=%s devphase=%s revision=%s\n",
827	pGccVer->basever, pGccVer->datestamp, pGccVer->devphase, pGccVer->revision);
828
829	/* Ask for callback in which we may register the attribute. */
830	register_callback(pPlugInInfo->base_name, PLUGIN_ATTRIBUTES, RegisterAttributesEvent, NULL /pvUser/);
831
832	/* Register our pass. */
833	#if RT_GNUC_PREREQ(4, 9)
834	/** The registration info for my pass. */
835	struct register_pass_info MyPassInfo;
836	MyPassInfo.pass = new MyPass(g);
837	MyPassInfo.reference_pass_name = "ssa";
838	MyPassInfo.ref_pass_instance_number = 1;
839	MyPassInfo.pos_op = PASS_POS_INSERT_BEFORE;
840	register_callback(pPlugInInfo->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &MyPassInfo);
841	#else
842	register_callback(pPlugInInfo->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, (void *)&g_MyPassInfo);
843	#endif
844
845	/* Register plug-in info. */
846	register_callback(pPlugInInfo->base_name, PLUGIN_INFO, NULL, (void *)&g_PlugInInfo);
847
848	return 0;
849	}
850
851
852
853
854	/*
855	*
856	* Functions used by the common code.
857	* Functions used by the common code.
858	* Functions used by the common code.
859	*
860	*/
861
862	void VFmtChkWarnFmt(PVFMTCHKSTATE pState, const char pszLoc, const char pszFormat, ...)
863	{
864	char szTmp[1024];
865	va_list va;
866	va_start(va, pszFormat);
867	vsnprintf(szTmp, sizeof(szTmp), pszFormat, va);
868	va_end(va);
869
870	/* display the warning. */
871	warning_at(MyGetFormatStringLocation(pState, pszLoc), 0, "%s", szTmp);
872	}
873
874
875	void VFmtChkErrFmt(PVFMTCHKSTATE pState, const char pszLoc, const char pszFormat, ...)
876	{
877	char szTmp[1024];
878	va_list va;
879	va_start(va, pszFormat);
880	vsnprintf(szTmp, sizeof(szTmp), pszFormat, va);
881	va_end(va);
882
883	/* display the warning. */
884	error_at(MyGetFormatStringLocation(pState, pszLoc), "%s", szTmp);
885	}
886
887
888
889	void VFmtChkVerifyEndOfArgs(PVFMTCHKSTATE pState, unsigned iArg)
890	{
891	dprintf("VFmtChkVerifyEndOfArgs: iArg=%u iArgs=%ld cArgs=%u\n", iArg, pState->iArgs, gimple_call_num_args(pState->hStmt));
892	if (pState->iArgs > 0)
893	{
894	iArg += pState->iArgs - 1;
895	unsigned cArgs = gimple_call_num_args(pState->hStmt);
896	if (iArg == cArgs)
897	{ /* fine */ }
898	else if (iArg < cArgs)
899	{
900	tree hArg = gimple_call_arg(pState->hStmt, iArg);
901	if (cArgs - iArg > 1)
902	error_at(MY_LOC(hArg, pState), "%u extra arguments not consumed by format string", cArgs - iArg);
903	else if ( TREE_CODE(hArg) != INTEGER_CST
904	\|\| !MY_DOUBLE_INT_FITS_SHWI(hArg)
905	\|\| MY_DOUBLE_INT_TO_SHWI(hArg) != -99) /* ignore final dummy argument: ..., -99); */
906	error_at(MY_LOC(hArg, pState), "one extra argument not consumed by format string");
907	}
908	/* This should be handled elsewhere, but just in case. */
909	else if (iArg - 1 == cArgs)
910	error_at(pState->hFmtLoc, "one argument too few");
911	else
912	error_at(pState->hFmtLoc, "%u arguments too few", iArg - cArgs);
913	}
914	}
915
916
917	bool VFmtChkRequirePresentArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
918	{
919	if (pState->iArgs > 0)
920	{
921	iArg += pState->iArgs - 1;
922	unsigned cArgs = gimple_call_num_args(pState->hStmt);
923	if (iArg >= cArgs)
924	{
925	VFmtChkErrFmt(pState, pszLoc, "Missing argument! %s", pszMessage);
926	return false;
927	}
928
929	tree hArg = gimple_call_arg(pState->hStmt, iArg);
930	tree hType = TREE_TYPE(hArg);
931	dprintf("arg%u: hArg=%p [%s] hType=%p [%s] cls=%s\n", iArg, hArg, get_tree_code_name(TREE_CODE(hArg)),
932	hType, get_tree_code_name(TREE_CODE(hType)), tree_code_class_strings[TREE_CODE_CLASS(TREE_CODE(hType))]);
933	dprintf(" nm=%p\n", TYPE_NAME(hType));
934	dprintf(" cb=%p %s value=%ld\n", TYPE_SIZE(hType), get_tree_code_name(TREE_CODE(TYPE_SIZE(hType))),
935	MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE(hType)) );
936	dprintf(" unit=%p %s value=%ld\n", TYPE_SIZE_UNIT(hType), get_tree_code_name(TREE_CODE(TYPE_SIZE_UNIT(hType))),
937	MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE_UNIT(hType)) );
938	tree hTypeNm = TYPE_NAME(hType);
939	if (hTypeNm)
940	dprintf(" typenm=%p %s '%s'\n", hTypeNm, get_tree_code_name(TREE_CODE(hTypeNm)),
941	IDENTIFIER_POINTER(DECL_NAME(hTypeNm)));
942	}
943	return true;
944	}
945
946
947	bool VFmtChkRequireIntArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
948	{
949	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
950	{
951	/** @todo type check. */
952	return true;
953	}
954	return false;
955	}
956
957
958	bool VFmtChkRequireStringArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
959	{
960	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
961	{
962	/** @todo type check. */
963	return true;
964	}
965	return false;
966	}
967
968
969	bool VFmtChkRequireVaListPtrArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
970	{
971	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
972	{
973	/** @todo type check. */
974	return true;
975	}
976	return false;
977	}
978
979
980	void VFmtChkHandleReplacementFormatString(PVFMTCHKSTATE pState, const char *pszPctM, unsigned iArg)
981	{
982	if (pState->iArgs > 0)
983	{
984	pState->iFmt = pState->iArgs + iArg;
985	pState->iArgs = pState->iFmt + 1;
986	pState->fMaybeNull = false;
987	MyCheckFormatRecursive(pState, gimple_call_arg(pState->hStmt, pState->iFmt - 1));
988	}
989	}
990
991
992	const char *VFmtChkGetFmtLocFile(PVFMTCHKSTATE pState)
993	{
994	return LOCATION_FILE(pState->hFmtLoc);
995	}
996
997
998	unsigned int VFmtChkGetFmtLocLine(PVFMTCHKSTATE pState)
999	{
1000	return LOCATION_LINE(pState->hFmtLoc);
1001	}
1002
1003
1004	unsigned int VFmtChkGetFmtLocColumn(PVFMTCHKSTATE pState)
1005	{
1006	#ifdef LOCATION_COLUMN
1007	return LOCATION_COLUMN(pState->hFmtLoc);
1008	#else
1009	return 1;
1010	#endif
1011	}
1012

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source: vbox/trunk/src/bldprogs/VBoxCompilerPlugInsGcc.cpp@ 100111

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