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VBoxCompilerPlugInsGcc.cpp

Last change on this file was 105378, checked in by vboxsync, 7 weeks ago
bldprogs/gccplugin: Implemented the iprt_callreq attribute (against gcc 13.2.0). bugref:10725
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File size: 46.0 KB

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1	/* $Id: VBoxCompilerPlugInsGcc.cpp 105378 2024-07-17 14:07:15Z 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	#include "tree-pretty-print.h"
52	#if __GNUC__ == 5 && __GNUC_MINOR__ == 4
53	# include "tree-ssa-alias.h"
54	# include "gimple-expr.h"
55	#endif
56	#include "gimple.h"
57	#if RT_GNUC_PREREQ(4, 9)
58	# include "gimple-iterator.h"
59	# include "context.h" /* for g */
60	#endif
61	#include "cp/cp-tree.h"
62	#if RT_GNUC_PREREQ(9, 4)
63	# include "stringpool.h"
64	# include "attribs.h"
65	#endif
66	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
67	}
68	#endif
69
70	#include "VBoxCompilerPlugIns.h"
71
72
73	/*********************************************************************************************************************************
74	* Global Variables *
75	*********************************************************************************************************************************/
76	/** License indicator. */
77	int plugin_is_GPL_compatible;
78
79
80	/*********************************************************************************************************************************
81	* Defined Constants And Macros *
82	*********************************************************************************************************************************/
83	/** Convencience macro not present in earlier gcc versions. */
84	#ifndef VAR_P
85	# define VAR_P(a_hNode) (TREE_CODE(a_hNode) == VAR_DECL)
86	#endif
87	/** Replacement for the 4.9.0 get_tree_code_name function. */
88	#if !RT_GNUC_PREREQ(4, 9)
89	# define get_tree_code_name(a_enmTreeCode) (tree_code_name[a_enmTreeCode])
90	#endif
91
92
93	/** For use with messages.
94	* @todo needs some more work... Actually, seems we're a bit handicapped by
95	* working on gimplified stuff. */
96	#define MY_LOC(a_hPreferred, a_pState) EXPR_LOC_OR_LOC(a_hPreferred, (a_pState)->hFmtLoc)
97
98	/** @name Compatibility glue
99	* @{ */
100	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
101	# define linemap_location_from_macro_expansion_p(a, b) false
102	#endif
103	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
104	static tree gimple_call_fntype(gimple hStmt)
105	{
106	tree hDecl = gimple_call_fndecl(hStmt);
107	if (hDecl)
108	return TREE_TYPE(hDecl);
109	hDecl = gimple_call_fn(hStmt);
110	if (TREE_CODE(hDecl) == OBJ_TYPE_REF)
111	hDecl = OBJ_TYPE_REF_EXPR(hDecl);
112	if (DECL_P(hDecl))
113	{
114	tree hType = TREE_TYPE(hDecl);
115	if (POINTER_TYPE_P(hType))
116	hType = TREE_TYPE(hType);
117	return hType;
118	}
119	return NULL_TREE; /* caller bitches about this*/
120	}
121	#endif
122
123	///* Integer to HOST_WIDE_INT conversion fun. */
124	//#if RT_GNUC_PREREQ(4, 6)
125	//# define MY_INT_FITS_SHWI(hNode) (hNode).fits_shwi()
126	//# define MY_INT_TO_SHWI(hNode) (hNode).to_shwi()
127	//#else
128	//# define MY_INT_FITS_SHWI(hNode) double_int_fits_in_shwi_p(hNode)
129	//# define MY_INT_TO_SHWI(hNode) double_int_to_shwi(hNode)
130	//#endif
131
132	/* Integer to HOST_WIDE_INT conversion fun. */
133	#if RT_GNUC_PREREQ(5, 1)
134	# define MY_DOUBLE_INT_FITS_SHWI(hNode) tree_fits_shwi_p(hNode)
135	# define MY_DOUBLE_INT_TO_SHWI(hNode) tree_to_shwi(hNode)
136	#elif RT_GNUC_PREREQ(4, 6)
137	# define MY_DOUBLE_INT_FITS_SHWI(hNode) (TREE_INT_CST(hNode).fits_shwi())
138	# define MY_DOUBLE_INT_TO_SHWI(hNode) (TREE_INT_CST(hNode).to_shwi())
139	#else
140	# define MY_DOUBLE_INT_FITS_SHWI(hNode) double_int_fits_in_shwi_p(TREE_INT_CST(hNode))
141	# define MY_DOUBLE_INT_TO_SHWI(hNode) double_int_to_shwi(TREE_INT_CST(hNode))
142	#endif
143
144	#ifndef EXPR_LOC_OR_LOC
145	# define EXPR_LOC_OR_LOC(a,b) (b)
146	#endif
147	/** @} */
148
149
150	/*********************************************************************************************************************************
151	* Structures and Typedefs *
152	*********************************************************************************************************************************/
153	/** gimple statement handle. */
154	#if RT_GNUC_PREREQ(6, 0)
155	typedef const gimple *MY_GIMPLE_HSTMT_T;
156	#else
157	typedef gimple MY_GIMPLE_HSTMT_T;
158	#endif
159
160
161	/*********************************************************************************************************************************
162	* Internal Functions *
163	*********************************************************************************************************************************/
164	static bool MyPassGateCallback(void);
165	static unsigned int MyPassExecuteCallback(void);
166	static unsigned int MyPassExecuteCallbackWithFunction(struct function *pFun);
167	static tree AttributeHandlerFormat(tree , tree, tree, int, bool );
168	static tree AttributeHandlerCallReq(tree , tree, tree, int, bool );
169
170
171	/*********************************************************************************************************************************
172	* Global Variables *
173	*********************************************************************************************************************************/
174	/** Plug-in info. */
175	static const struct plugin_info g_PlugInInfo =
176	{
177	version: "0.0.0-ALPHA",
178	help : "Implements the __iprt_format__ attribute for checking format strings and arguments."
179	};
180
181	#if RT_GNUC_PREREQ(4, 9)
182
183	/** My pass. */
184	static const pass_data g_MyPassData =
185	{
186	type : GIMPLE_PASS,
187	name : "iprt-format-checks", / asterisk = no dump */
188	# if RT_GNUC_PREREQ(9, 4)
189	optinfo_flags : OPTGROUP_NONE,
190	# else
191	optinfo_flags : 0,
192	# endif
193	tv_id : TV_NONE,
194	properties_required : 0,
195	properties_provided : 0,
196	properties_destroyed : 0,
197	todo_flags_start : 0,
198	todo_flags_finish : 0,
199	};
200
201	class MyPass : public gimple_opt_pass
202	{
203	public:
204	MyPass(gcc::context *pCtx) : gimple_opt_pass(g_MyPassData, pCtx)
205	{ }
206
207	virtual bool gate(function *pFun)
208	{
209	NOREF(pFun);
210	return MyPassGateCallback();
211	}
212
213	virtual unsigned int execute(function *pFun)
214	{
215	NOREF(pFun);
216	return MyPassExecuteCallbackWithFunction(pFun);
217	}
218	};
219
220	#else /* < 4.9.0 */
221
222	/** My pass. */
223	static struct gimple_opt_pass g_MyPass =
224	{
225	pass:
226	{
227	type : GIMPLE_PASS,
228	name : "iprt-format-and-callreq-checks", / asterisk = no dump */
229	# if RT_GNUC_PREREQ(4, 6)
230	optinfo_flags : 0,
231	# endif
232	gate : MyPassGateCallback,
233	execute : MyPassExecuteCallback,
234	sub : NULL,
235	next : NULL,
236	static_pass_number : 0,
237	tv_id : TV_NONE,
238	properties_required : 0,
239	properties_provided : 0,
240	properties_destroyed : 0,
241	todo_flags_start : 0,
242	todo_flags_finish : 0,
243	}
244	};
245
246	/** The registration info for my pass. */
247	static const struct register_pass_info g_MyPassInfo =
248	{
249	pass : &g_MyPass.pass,
250	reference_pass_name : "ssa",
251	ref_pass_instance_number : 1,
252	pos_op : PASS_POS_INSERT_BEFORE,
253	};
254
255	#endif /* < 4.9.0 */
256
257
258	/** Attribute specifications. */
259	static const struct attribute_spec g_aAttribSpecs[] =
260	{
261	{
262	name : "iprt_format",
263	min_length : 2,
264	max_length : 2,
265	decl_required : false,
266	type_required : true,
267	function_type_required : true,
268	// gcc 6.3 at least moves this field to after "handler", and with 8.3 it is back
269	#if RT_GNUC_PREREQ(4, 6) && !(RT_GNUC_PREREQ(6, 3) && !RT_GNUC_PREREQ(8, 0))
270	affects_type_identity : false,
271	#endif
272	handler : AttributeHandlerFormat,
273	#if RT_GNUC_PREREQ(6, 3) && !RT_GNUC_PREREQ(8, 0)
274	affects_type_identity : false,
275	#endif
276	#if RT_GNUC_PREREQ(8, 0)
277	exclude : NULL,
278	#endif
279	},
280	{
281	name : "iprt_format_maybe_null",
282	min_length : 2,
283	max_length : 2,
284	decl_required : false,
285	type_required : true,
286	function_type_required : true,
287	#if RT_GNUC_PREREQ(4, 6) && !(RT_GNUC_PREREQ(6, 3) && !RT_GNUC_PREREQ(8, 0))
288	affects_type_identity : false,
289	#endif
290	handler : AttributeHandlerFormat,
291	#if RT_GNUC_PREREQ(6, 3) && !RT_GNUC_PREREQ(8, 0)
292	affects_type_identity : false,
293	#endif
294	#if RT_GNUC_PREREQ(8, 0)
295	exclude : NULL,
296	#endif
297	},
298	{
299	name : "iprt_callreq",
300	min_length : 3,
301	max_length : 3,
302	decl_required : false,
303	type_required : true,
304	function_type_required : true,
305	#if RT_GNUC_PREREQ(4, 6) && !(RT_GNUC_PREREQ(6, 3) && !RT_GNUC_PREREQ(8, 0))
306	affects_type_identity : false,
307	#endif
308	handler : AttributeHandlerCallReq,
309	#if RT_GNUC_PREREQ(6, 3) && !RT_GNUC_PREREQ(8, 0)
310	affects_type_identity : false,
311	#endif
312	#if RT_GNUC_PREREQ(8, 0)
313	exclude : NULL,
314	#endif
315	}
316	};
317
318
319	#ifdef DEBUG
320
321	/**
322	* Debug function for printing the scope of a decl.
323	* @param hDecl Declaration to print scope for.
324	*/
325	static void dprintScope(tree hDecl)
326	{
327	# if 0 /* later? */
328	tree hScope = CP_DECL_CONTEXT(hDecl);
329	if (hScope == global_namespace)
330	return;
331	if (TREE_CODE(hScope) == RECORD_TYPE)
332	hScope = TYPE_NAME(hScope);
333
334	/* recurse */
335	dprintScope(hScope);
336
337	/* name the scope. */
338	dprintf("::%s", DECL_NAME(hScope) ? IDENTIFIER_POINTER(DECL_NAME(hScope)) : "<noname>");
339	# endif
340	}
341
342
343	/**
344	* Debug function for printing a declaration.
345	* @param hDecl The declaration to print.
346	*/
347	static void dprintDecl(tree hDecl)
348	{
349	enum tree_code const enmDeclCode = TREE_CODE(hDecl);
350	tree const hType = TREE_TYPE(hDecl);
351	enum tree_code const enmTypeCode = hType ? TREE_CODE(hType) : (enum tree_code)-1;
352	# if 0
353	if ( enmTypeCode == RECORD_TYPE
354	&& enmDeclCode == TYPE_DECL
355	&& DECL_ARTIFICIAL(hDecl))
356	dprint_class(hType);
357	# endif
358
359	dprintf("%s ", get_tree_code_name(enmDeclCode));
360	dprintScope(hDecl);
361	dprintf("::%s", DECL_NAME(hDecl) ? IDENTIFIER_POINTER(DECL_NAME(hDecl)) : "<noname>");
362	if (hType)
363	dprintf(" type %s", get_tree_code_name(enmTypeCode));
364	dprintf(" @%s:%d", DECL_SOURCE_FILE(hDecl), DECL_SOURCE_LINE(hDecl));
365	}
366
367	#endif /* DEBUG */
368
369
370	static location_t MyGetLocationPlusColumnOffset(location_t hLoc, unsigned int offColumn)
371	{
372	/*
373	* Skip NOOPs, reserved locations and macro expansion.
374	*/
375	if ( offColumn != 0
376	&& hLoc >= RESERVED_LOCATION_COUNT
377	&& !linemap_location_from_macro_expansion_p(line_table, hLoc))
378	{
379	#if __GNUC__ >= 5 /** @todo figure this... */
380	/*
381	* There is an API for doing this, nice.
382	*/
383	location_t hNewLoc = linemap_position_for_loc_and_offset(line_table, hLoc, offColumn);
384	if (hNewLoc && hNewLoc != hLoc)
385	{
386	dprintf("MyGetLocationPlusColumnOffset: hNewLoc=%#x hLoc=%#x offColumn=%u\n", hNewLoc, hLoc, offColumn);
387	return hNewLoc;
388	}
389
390	#elif __GNUC_MINOR__ > 5
391	/*
392	* Have to do the job ourselves, it seems. This is a bit hairy...
393	*/
394	line_map const *pMap = NULL;
395	location_t hLoc2 = linemap_resolve_location(line_table, hLoc, LRK_SPELLING_LOCATION, &pMap);
396	if (hLoc2)
397	hLoc = hLoc2;
398
399	/* Guard against wrap arounds and overlaps. */
400	if ( hLoc + offColumn > MAP_START_LOCATION(pMap) /** @todo Use MAX_SOURCE_LOCATION? */
401	&& ( pMap == LINEMAPS_LAST_ORDINARY_MAP(line_table)
402	\|\| hLoc + offColumn < MAP_START_LOCATION((pMap + 1))))
403	{
404	/* Calc new column and check that it's within the valid range. */
405	unsigned int uColumn = SOURCE_COLUMN(pMap, hLoc) + offColumn;
406	if (uColumn < RT_BIT_32(ORDINARY_MAP_NUMBER_OF_COLUMN_BITS(pMap)))
407	{
408	/* Try add the position. If we get a valid result, replace the location. */
409	source_location hNewLoc = linemap_position_for_line_and_column((line_map *)pMap, SOURCE_LINE(pMap, hLoc), uColumn);
410	if ( hNewLoc <= line_table->highest_location
411	&& linemap_lookup(line_table, hNewLoc) != NULL)
412	{
413	dprintf("MyGetLocationPlusColumnOffset: hNewLoc=%#x hLoc=%#x offColumn=%u uColumn=%u\n",
414	hNewLoc, hLoc, offColumn, uColumn);
415	return hNewLoc;
416	}
417	}
418	}
419	#endif
420	}
421	dprintf("MyGetLocationPlusColumnOffset: taking fallback\n");
422	return hLoc;
423	}
424
425
426	#if 0
427	DECLINLINE(int) MyGetLineLength(const char *pszLine)
428	{
429	if (pszLine)
430	{
431	const char *pszEol = strpbrk(pszLine, "\n\r");
432	if (!pszEol)
433	pszEol = strchr(pszLine, '\0');
434	return (int)(pszEol - pszLine);
435	}
436	return 0;
437	}
438	#endif
439
440	static location_t MyGetFormatStringLocation(PVFMTCHKSTATE pState, const char *pszLoc)
441	{
442	location_t hLoc = pState->hFmtLoc;
443	#if RT_GNUC_PREREQ(4,6)
444	intptr_t offString = pszLoc - pState->pszFmt;
445	if ( offString >= 0
446	&& !linemap_location_from_macro_expansion_p(line_table, hLoc))
447	{
448	unsigned uCol = 1 + offString;
449	# if 0 /* apparently not needed */
450	expanded_location XLoc = expand_location_to_spelling_point(hLoc);
451	# if RT_GNUC_PREREQ(10,0)
452	char_span Span = location_get_source_line(XLoc.file, XLoc.line);
453	const char pszLine = Span.m_ptr; /* @todo if enabled */
454	int cchLine = (int)Span.m_n_elts;
455	# elif RT_GNUC_PREREQ(6,0)
456	int cchLine = 0;
457	const char *pszLine = location_get_source_line(XLoc.file, XLoc.line, &cchLine);
458	# elif RT_GNUC_PREREQ(5,0)
459	int cchLine = 0;
460	const char *pszLine = location_get_source_line(XLoc, &cchLine);
461	# else
462	const char *pszLine = location_get_source_line(XLoc);
463	int cchLine = MyGetLineLength(pszLine);
464	# endif
465	if (pszLine)
466	{
467	/** @todo Adjust the position by parsing the source. */
468	pszLine += XLoc.column - 1;
469	cchLine -= XLoc.column - 1;
470	}
471	# endif
472
473	hLoc = MyGetLocationPlusColumnOffset(hLoc, uCol);
474	}
475	#endif
476	return hLoc;
477	}
478
479
480	/**
481	* Non-recursive worker for MyCheckFormatRecursive.
482	*
483	* This will attempt to result @a hFmtArg into a string literal which it then
484	* passes on to MyCheckFormatString for the actual analyzis.
485	*
486	* @param pState The format string checking state.
487	* @param hFmtArg The format string node.
488	*/
489	DECL_NO_INLINE(static, void) MyCheckFormatNonRecursive(PVFMTCHKSTATE pState, tree hFmtArg)
490	{
491	dprintf("checker: hFmtArg=%p %s\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)));
492
493	/*
494	* Try resolve variables into constant strings.
495	*/
496	if (VAR_P(hFmtArg))
497	{
498	hFmtArg = decl_constant_value(hFmtArg);
499	STRIP_NOPS(hFmtArg); /* Used as argument and assigned call result. */
500	dprintf("checker1: variable => hFmtArg=%p %s\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)));
501	}
502
503	/*
504	* Fend off NULLs.
505	*/
506	if (integer_zerop(hFmtArg))
507	{
508	if (pState->fMaybeNull)
509	VFmtChkVerifyEndOfArgs(pState, 0);
510	else
511	error_at(MY_LOC(hFmtArg, pState), "Format string should not be NULL");
512	}
513	/*
514	* Need address expression to get any further.
515	*/
516	else if (TREE_CODE(hFmtArg) != ADDR_EXPR)
517	dprintf("checker1: Not address expression (%s)\n", get_tree_code_name(TREE_CODE(hFmtArg)));
518	else
519	{
520	pState->hFmtLoc = EXPR_LOC_OR_LOC(hFmtArg, pState->hFmtLoc);
521	hFmtArg = TREE_OPERAND(hFmtArg, 0);
522
523	/*
524	* Deal with fixed string indexing, if possible.
525	*/
526	HOST_WIDE_INT off = 0;
527	if ( TREE_CODE(hFmtArg) == ARRAY_REF
528	&& MY_DOUBLE_INT_FITS_SHWI(TREE_OPERAND(hFmtArg, 1))
529	&& MY_DOUBLE_INT_FITS_SHWI(TREE_OPERAND(hFmtArg, 1)) )
530	{
531	off = MY_DOUBLE_INT_TO_SHWI(TREE_OPERAND(hFmtArg, 1));
532	if (off < 0)
533	{
534	dprintf("checker1: ARRAY_REF, off=%ld\n", off);
535	return;
536	}
537	hFmtArg = TREE_OPERAND(hFmtArg, 0);
538	dprintf("checker1: ARRAY_REF => hFmtArg=%p %s, off=%ld\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)), off);
539	}
540
541	/*
542	* Deal with static const char g_szFmt[] = "qwerty"; Take care as
543	* the actual string constant may not necessarily include the terminator.
544	*/
545	tree hArraySize = NULL_TREE;
546	if ( VAR_P(hFmtArg)
547	&& TREE_CODE(TREE_TYPE(hFmtArg)) == ARRAY_TYPE)
548	{
549	tree hArrayInitializer = decl_constant_value(hFmtArg);
550	if ( hArrayInitializer != hFmtArg
551	&& TREE_CODE(hArrayInitializer) == STRING_CST)
552	{
553	hArraySize = DECL_SIZE_UNIT(hFmtArg);
554	hFmtArg = hArrayInitializer;
555	}
556	}
557
558	/*
559	* Are we dealing with a string literal now?
560	*/
561	if (TREE_CODE(hFmtArg) != STRING_CST)
562	dprintf("checker1: Not string literal (%s)\n", get_tree_code_name(TREE_CODE(hFmtArg)));
563	else if (TYPE_MAIN_VARIANT(TREE_TYPE(TREE_TYPE(hFmtArg))) != char_type_node)
564	warning_at(pState->hFmtLoc, 0, "expected 'char' type string literal");
565	else
566	{
567	/*
568	* Yes we are, so get the pointer to the string and its length.
569	*/
570	const char *pszFmt = TREE_STRING_POINTER(hFmtArg);
571	int cchFmt = TREE_STRING_LENGTH(hFmtArg);
572
573	/* Adjust cchFmt to the initialized array size if appropriate. */
574	if (hArraySize != NULL_TREE)
575	{
576	if (TREE_CODE(hArraySize) != INTEGER_CST)
577	warning_at(pState->hFmtLoc, 0, "Expected integer array size (not %s)", get_tree_code_name(TREE_CODE(hArraySize)));
578	else if (!MY_DOUBLE_INT_FITS_SHWI(hArraySize))
579	warning_at(pState->hFmtLoc, 0, "Unexpected integer overflow in array size constant");
580	else
581	{
582	HOST_WIDE_INT cbArray = MY_DOUBLE_INT_TO_SHWI(hArraySize);
583	if ( cbArray <= 0
584	\|\| cbArray != (int)cbArray)
585	warning_at(pState->hFmtLoc, 0, "Unexpected integer array size constant value: %ld", cbArray);
586	else if (cchFmt > cbArray)
587	{
588	dprintf("checker1: cchFmt=%d => cchFmt=%ld (=cbArray)\n", cchFmt, cbArray);
589	cchFmt = (int)cbArray;
590	}
591	}
592	}
593
594	/* Apply the offset, if given. */
595	if (off)
596	{
597	if (off >= cchFmt)
598	{
599	dprintf("checker1: off=%ld >= cchFmt=%d -> skipping\n", off, cchFmt);
600	return;
601	}
602	pszFmt += off;
603	cchFmt -= (int)off;
604	}
605
606	/*
607	* Check for unterminated strings.
608	*/
609	if ( cchFmt < 1
610	\|\| pszFmt[cchFmt - 1] != '\0')
611	warning_at(pState->hFmtLoc, 0, "Unterminated format string (cchFmt=%d)", cchFmt);
612	/*
613	* Call worker to check the actual string.
614	*/
615	else
616	MyCheckFormatCString(pState, pszFmt);
617	}
618	}
619	}
620
621
622	/**
623	* Deal recursively with special format string constructs.
624	*
625	* This will call MyCheckFormatNonRecursive to validate each format string.
626	*
627	* @param pState The format string checking state.
628	* @param hFmtArg The format string node.
629	*/
630	static void MyCheckFormatRecursive(PVFMTCHKSTATE pState, tree hFmtArg)
631	{
632	/*
633	* Catch wrong attribute use.
634	*/
635	if (hFmtArg == NULL_TREE)
636	error_at(pState->hFmtLoc, "IPRT format attribute is probably used incorrectly (hFmtArg is NULL)");
637	/*
638	* NULL format strings may cause crashes.
639	*/
640	else if (integer_zerop(hFmtArg))
641	{
642	if (pState->fMaybeNull)
643	VFmtChkVerifyEndOfArgs(pState, 0);
644	else
645	error_at(MY_LOC(hFmtArg, pState), "Format string should not be NULL");
646	}
647	/*
648	* Check both branches of a ternary operator.
649	*/
650	else if (TREE_CODE(hFmtArg) == COND_EXPR)
651	{
652	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 1));
653	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 2));
654	}
655	/*
656	* Strip coercion.
657	*/
658	else if ( CONVERT_EXPR_P(hFmtArg)
659	&& TYPE_PRECISION(TREE_TYPE(hFmtArg)) == TYPE_PRECISION(TREE_TYPE(TREE_OPERAND(hFmtArg, 0))) )
660	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 0));
661	/*
662	* We're good, hand it to the non-recursive worker.
663	*/
664	else
665	MyCheckFormatNonRecursive(pState, hFmtArg);
666	}
667
668
669	/**
670	* Check VMR3ReqCallU stuff.
671	*
672	* @param pState The checking state.
673	*/
674	static void MyCheckCallReq(MY_GIMPLE_HSTMT_T const hStmt, location_t const hStmtLoc,
675	long const idxFn, long const idxArgc, long const idxArgs, unsigned const cCallArgs)
676	{
677	#ifdef DEBUG
678	expanded_location const XLoc = expand_location_to_spelling_point(hStmtLoc);
679	dprintf("checker-call: cCallArgs=%#lx - %s:%u\n", cCallArgs, XLoc.file ? XLoc.file : "<nofile>", XLoc.line);
680	#endif
681
682	/*
683	* Catch incorrect attribute use.
684	*/
685	if (idxFn > cCallArgs)
686	{
687	error_at(hStmtLoc, "Incorrect function argument number (first param) in IPRT call attribute: %lu (max %u)",
688	idxFn, cCallArgs);
689	return;
690	}
691	if (idxArgc > cCallArgs)
692	{
693	error_at(hStmtLoc, "Incorrect argument count argument number (second param) in IPRT call attribute: %lu (max %u)",
694	idxArgc, cCallArgs);
695	return;
696	}
697	if (idxArgs > cCallArgs + 1)
698	{
699	error_at(hStmtLoc, "Incorrect arguments argument number (last param) in IPRT call attribute: %lu (max %u)",
700	idxArgs, cCallArgs + 1);
701	return;
702	}
703
704	/*
705	* Get the argument count argument and check how it compares to cCallArgs if constant.
706	*/
707	tree hArgCount = gimple_call_arg(hStmt, idxArgc - 1);
708	if (!hArgCount)
709	{
710	error_at(hStmtLoc, "Failed to get the parameter counter argument (%lu)", idxArgc);
711	return;
712	}
713	HOST_WIDE_INT cArgsValue = -1;
714	if (TREE_CODE(hArgCount) == INTEGER_CST)
715	{
716	if (!MY_DOUBLE_INT_FITS_SHWI(hArgCount))
717	error_at(hStmtLoc, "Unexpected integer overflow in argument count constant");
718	else
719	{
720	cArgsValue = MY_DOUBLE_INT_TO_SHWI(hArgCount);
721	if ( cArgsValue < 0
722	\|\| cArgsValue != (int)cArgsValue)
723	error_at(hStmtLoc, "Unexpected integer argument count constant value: %ld", cArgsValue);
724	else
725	{
726	/* HARD CODED MAX and constants */
727	dprintf("checker-call: cArgsValue=%#lx\n", cArgsValue);
728	if ( cArgsValue <= 9
729	\|\| ((cArgsValue & 0x8000) && ((unsigned)cArgsValue & ~(unsigned)0x8000) <= 15) )
730	{ /* likely */ }
731	else
732	error_at(hStmtLoc, "Bad integer argument count constant value: %lx (max is 9, or 15 with flag)",
733	cArgsValue);
734
735	cArgsValue = (unsigned)cArgsValue & ~(unsigned)0x8000;
736	if (idxArgs != 0 && idxArgs + cArgsValue - 1 != (long)cCallArgs)
737	error_at(hStmtLoc, "Argument count %ld starting at %ld (1-based) does not match argument count: %u",
738	cArgsValue, idxArgs, cCallArgs);
739	}
740	}
741	}
742
743	/*
744	* Get the function pointer statement and strip any coercion.
745	*/
746	tree const hFnArg = gimple_call_arg(hStmt, idxFn - 1);
747	if (!hFnArg)
748	{
749	error_at(hStmtLoc, "Failed to get function argument (%lu)", idxFn);
750	return;
751	}
752	tree hFnType = 0;
753	if (TREE_CODE(hFnArg) == SSA_NAME)
754	{
755	dprintf(" * hFnArg=%p %s(%d) %s (SSA)\n", hFnArg, get_tree_code_name(TREE_CODE(hFnArg)), TREE_CODE(hFnArg),
756	SSA_NAME_IDENTIFIER(hFnArg) ? IDENTIFIER_POINTER(SSA_NAME_IDENTIFIER(hFnArg)) : "<unnamed-ssa-name>");
757	hFnType = TREE_TYPE(hFnArg);
758	if (hFnType && TREE_CODE(hFnType) != POINTER_TYPE)
759	{
760	error_at(hStmtLoc, "Expected pointer_type for hFnType=%p, not %s(%d)",
761	hFnType, get_tree_code_name(TREE_CODE(hFnType)), TREE_CODE(hFnType));
762	return;
763	}
764	if (hFnType)
765	hFnType = TREE_TYPE(hFnType);
766	}
767	else
768	{
769	dprintf(" * hFnArg=%p %s(%d)\n", hFnArg, get_tree_code_name(TREE_CODE(hFnArg)), TREE_CODE(hFnArg));
770	tree const hFnDecl = gimple_call_addr_fndecl(hFnArg);
771	if (hFnDecl)
772	{
773	#ifdef DEBUG
774	dprintDecl(hFnDecl);
775	dprintf("\n");
776	#endif
777	hFnType = TREE_TYPE(hFnDecl);
778	}
779	}
780	if (hFnType)
781	{
782	dprintf(" * hFnType=%p %s(%d)\n", hFnType, get_tree_code_name(TREE_CODE(hFnType)), TREE_CODE(hFnType));
783	if (TREE_CODE(hFnType) != FUNCTION_TYPE)
784	{
785	error_at(hStmtLoc, "Expected function_type for hFnType=%p, not %s(%d)",
786	hFnType, get_tree_code_name(TREE_CODE(hFnType)), TREE_CODE(hFnType));
787	return;
788	}
789
790	/* Count the arguments. */
791	unsigned cFnTypeArgs = 0;
792	tree const hArgList = TYPE_ARG_TYPES(hFnType);
793	dprintf(" * hArgList=%p %s(%d)\n", hFnType, get_tree_code_name(TREE_CODE(hArgList)), TREE_CODE(hArgList));
794	if (!hArgList)
795	error_at(hStmtLoc, "Using unprototyped function (arg %lu)?", idxFn);
796	else if (hArgList != void_list_node)
797	for (tree hArg = hArgList; hArg && hArg != void_list_node; hArg = TREE_CHAIN(hArg))
798	cFnTypeArgs++;
799
800	/* Check that it matches the argument value. */
801	if ((long)cFnTypeArgs != cArgsValue && cArgsValue >= 0)
802	error_at(hStmtLoc, "Function prototype takes %u arguments, but %u specified in the call request",
803	cFnTypeArgs, (unsigned)cArgsValue);
804
805	/*
806	* Check that there are no oversized arguments in the function type.
807	* If there are more than 9 arguments, also check the size of the lasts
808	* ones, up to but not including the last argument.
809	*/
810	HOST_WIDE_INT const cPtrBits = MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE(TREE_TYPE(null_pointer_node)));
811	HOST_WIDE_INT const cIntBits = MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE(integer_type_node));
812	unsigned iArg = 0;
813	for (tree hArg = hArgList; hArg && hArg != void_list_node; hArg = TREE_CHAIN(hArg), iArg++)
814	{
815	tree const hArgType = TREE_VALUE(hArg);
816	HOST_WIDE_INT const cArgBits = MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE(hArgType));
817	if (cArgBits > cPtrBits)
818	error_at(hStmtLoc, "Argument #%u (1-based) is too large: %lu bits, max %lu", iArg + 1, cArgBits, cPtrBits);
819	if (cArgBits != cPtrBits && iArg >= 8 && iArg != cFnTypeArgs - 1)
820	error_at(hStmtLoc, "Argument #%u (1-based) must be pointer sized: %lu bits, expect %lu",
821	iArg + 1, cArgBits, cPtrBits);
822
823	if (idxArgs > 0)
824	{
825	tree const hArgPassed = gimple_call_arg(hStmt, idxArgs - 1 + iArg);
826	tree hArgPassedType = TREE_TYPE(hArgPassed);
827
828	HOST_WIDE_INT const cArgPassedBits = MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE(hArgPassedType));
829	if ( cArgPassedBits != cArgBits
830	&& ( cArgPassedBits != cIntBits /* expected promotion target is INT */
831	\|\| cArgBits > cIntBits /* no promotion required */ ))
832	error_at(hStmtLoc,
833	"Argument #%u (1-based) passed to call request differs in size from target type: %lu bits, expect %lu",
834	iArg + 1, cArgPassedBits, cArgBits);
835	}
836	}
837
838	/** @todo check that the arguments passed in the VMR3ReqXxxx call matches. */
839	}
840	else if (idxArgs != 0)
841	error_at(hStmtLoc, "Failed to get function declaration (%lu) for non-va_list call", idxFn);
842	}
843
844
845	#if !RT_GNUC_PREREQ(4, 9)
846	/**
847	* Execute my pass.
848	* @returns Flags indicates stuff todo, we return 0.
849	*/
850	static unsigned int MyPassExecuteCallback(void)
851	{
852	return MyPassExecuteCallbackWithFunction(cfun);
853	}
854	#endif
855
856	/**
857	* Execute my pass.
858	* @returns Flags indicates stuff todo, we return 0.
859	*/
860	static unsigned int MyPassExecuteCallbackWithFunction(struct function *pFun)
861	{
862	dprintf("MyPassExecuteCallback:\n");
863
864	/*
865	* Enumerate the basic blocks.
866	*/
867	basic_block hBasicBlock;
868	FOR_EACH_BB_FN(hBasicBlock, pFun)
869	{
870	dprintf(" hBasicBlock=%p\n", hBasicBlock);
871
872	/*
873	* Enumerate the statements in the current basic block.
874	*
875	* We're interested in calls to functions with the __iprt_format__,
876	* iprt_format_maybe_null and __iprt_callreq__ attributes.
877	*/
878	for (gimple_stmt_iterator hStmtItr = gsi_start_bb(hBasicBlock); !gsi_end_p(hStmtItr); gsi_next(&hStmtItr))
879	{
880	#if RT_GNUC_PREREQ(6, 0)
881	const gimple * const hStmt = gsi_stmt(hStmtItr);
882	#else
883	gimple const hStmt = gsi_stmt(hStmtItr);
884	#endif
885
886	enum gimple_code const enmCode = gimple_code(hStmt);
887	#ifdef DEBUG
888	unsigned const cOps = gimple_num_ops(hStmt);
889	dprintf(" hStmt=%p %s (%d) ops=%d\n", hStmt, gimple_code_name[enmCode], enmCode, cOps);
890	for (unsigned iOp = 0; iOp < cOps; iOp++)
891	{
892	tree const hOp = gimple_op(hStmt, iOp);
893	if (hOp)
894	dprintf(" %02d: %p, code %s(%d)\n", iOp, hOp, get_tree_code_name(TREE_CODE(hOp)), TREE_CODE(hOp));
895	else
896	dprintf(" %02d: NULL_TREE\n", iOp);
897	}
898	#endif
899	if (enmCode == GIMPLE_CALL)
900	{
901	/*
902	* Check if the function type has the __iprt_format__ attribute.
903	*/
904	tree const hFn = gimple_call_fn(hStmt);
905	dprintf(" hFn =%p %s(%d); args=%d\n",
906	hFn, hFn ? get_tree_code_name(TREE_CODE(hFn)) : NULL, hFn ? TREE_CODE(hFn) : - 1,
907	gimple_call_num_args(hStmt));
908	#ifdef DEBUG
909	if (hFn && DECL_P(hFn))
910	dprintf(" hFn is decl: %s %s:%d\n",
911	DECL_NAME(hFn) ? IDENTIFIER_POINTER(DECL_NAME(hFn)) : "<unamed>",
912	DECL_SOURCE_FILE(hFn), DECL_SOURCE_LINE(hFn));
913	#endif
914	tree const hFnDecl = gimple_call_fndecl(hStmt);
915	if (hFnDecl)
916	dprintf(" hFnDecl=%p %s(%d) %s type=%p %s:%d\n",
917	hFnDecl, get_tree_code_name(TREE_CODE(hFnDecl)), TREE_CODE(hFnDecl),
918	DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
919	TREE_TYPE(hFnDecl), DECL_SOURCE_FILE(hFnDecl), DECL_SOURCE_LINE(hFnDecl));
920	tree const hFnType = gimple_call_fntype(hStmt);
921	if (hFnType == NULL_TREE)
922	{
923	if ( hFnDecl == NULL_TREE
924	&& gimple_call_internal_p(hStmt) /* va_arg() kludge */)
925	continue;
926	error_at(gimple_location(hStmt), "Failed to resolve function type [fn=%s fndecl=%s]",
927	hFn ? get_tree_code_name(TREE_CODE(hFn)) : "<null>",
928	hFnDecl ? get_tree_code_name(TREE_CODE(hFnDecl)) : "<null>");
929	}
930	else if (POINTER_TYPE_P(hFnType))
931	error_at(gimple_location(hStmt), "Got a POINTER_TYPE when expecting a function type [fn=%s]",
932	get_tree_code_name(TREE_CODE(hFn)));
933	if (hFnType)
934	dprintf(" hFnType=%p %s(%d) %s\n", hFnType, get_tree_code_name(TREE_CODE(hFnType)), TREE_CODE(hFnType),
935	TYPE_NAME(hFnType) && DECL_NAME(TYPE_NAME(hFnType))
936	? IDENTIFIER_POINTER(DECL_NAME(TYPE_NAME(hFnType))) : "<unamed>");
937
938	tree const hAttrCall = hFnType ? lookup_attribute("iprt_callreq", TYPE_ATTRIBUTES(hFnType)) : NULL_TREE;
939	tree const hAttrFmt = hFnType ? lookup_attribute("iprt_format", TYPE_ATTRIBUTES(hFnType)) : NULL_TREE;
940	tree const hAttrFmtMaybe0 = hFnType ? lookup_attribute("iprt_format_maybe_null", TYPE_ATTRIBUTES(hFnType)) : NULL_TREE;
941	if (hAttrCall \|\| hAttrFmt \|\| hAttrFmtMaybe0)
942	{
943	/*
944	* Yeah, it has one of the attributes!
945	*/
946	unsigned const cCallArgs = gimple_call_num_args(hStmt);
947	tree hAttrArgs;
948	if (hAttrCall)
949	{
950	hAttrArgs = TREE_VALUE(hAttrCall);
951	long const idxFn = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
952	long const idxArgc = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
953	long const idxArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(TREE_CHAIN(hAttrArgs))));
954	dprintf(" %s() __iprt_callreq__(idxFn=%ld, idxArgc=%ld, idxArgs=%ld)\n",
955	hFnDecl && DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
956	idxFn, idxArgc, idxArgs);
957	MyCheckCallReq(hStmt, gimple_location(hStmt), idxFn, idxArgc, idxArgs, cCallArgs);
958	}
959	else
960	{
961	hAttrArgs = hAttrFmt ? TREE_VALUE(hAttrFmt) : TREE_VALUE(hAttrFmtMaybe0);
962	VFMTCHKSTATE State;
963	State.hStmt = hStmt;
964	State.hFmtLoc = gimple_location(hStmt);
965	State.fMaybeNull = hAttrFmt ? false : true;
966	State.iFmt = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
967	State.iArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
968	State.pszFmt = NULL;
969	dprintf(" %s() __iprt_format%s__(iFmt=%ld, iArgs=%ld)\n",
970	hFnDecl && DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
971	State.fMaybeNull ? "_maybe_null" : "", State.iFmt, State.iArgs);
972	if (cCallArgs >= State.iFmt)
973	MyCheckFormatRecursive(&State, gimple_call_arg(hStmt, State.iFmt - 1));
974	else
975	error_at(gimple_location(hStmt),
976	"Call has only %d arguments; %s() format string is argument #%lu (1-based), thus missing",
977	cCallArgs, DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
978	State.iFmt);
979	}
980	}
981	}
982	}
983	}
984	return 0;
985	}
986
987
988	/**
989	* Gate callback for my pass that indicates whether it should execute or not.
990	* @returns true to execute.
991	*/
992	static bool MyPassGateCallback(void)
993	{
994	dprintf("MyPassGateCallback:\n");
995	return true;
996	}
997
998
999	/**
1000	* Validate the use of an format attribute.
1001	*
1002	* @returns ??
1003	* @param phOnNode The node the attribute is being used on.
1004	* @param hAttrName The attribute name.
1005	* @param hAttrArgs The attribute arguments.
1006	* @param fFlags Some kind of flags...
1007	* @param pfDontAddAttrib Whether to add the attribute to this node or not.
1008	*/
1009	static tree AttributeHandlerFormat(tree phOnNode, tree hAttrName, tree hAttrArgs, int fFlags, bool pfDontAddAttrib)
1010	{
1011	dprintf("AttributeHandlerFormat: name=%s fFlags=%#x", IDENTIFIER_POINTER(hAttrName), fFlags);
1012	long iFmt = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
1013	long iArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
1014	dprintf(" iFmt=%ld iArgs=%ld", iFmt, iArgs);
1015
1016	tree hType = *phOnNode;
1017	dprintf(" hType=%p %s(%d)\n", hType, get_tree_code_name(TREE_CODE(hType)), TREE_CODE(hType));
1018
1019	if (pfDontAddAttrib)
1020	*pfDontAddAttrib = false;
1021	return NULL_TREE;
1022	}
1023
1024
1025	/**
1026	* Validate the use of an call request attribute.
1027	*
1028	* @returns ??
1029	* @param phOnNode The node the attribute is being used on.
1030	* @param hAttrName The attribute name.
1031	* @param hAttrArgs The attribute arguments.
1032	* @param fFlags Some kind of flags...
1033	* @param pfDontAddAttrib Whether to add the attribute to this node or not.
1034	*/
1035	static tree AttributeHandlerCallReq(tree phOnNode, tree hAttrName, tree hAttrArgs, int fFlags, bool pfDontAddAttrib)
1036	{
1037	dprintf("AttributeHandlerCallReq: name=%s fFlags=%#x", IDENTIFIER_POINTER(hAttrName), fFlags);
1038	long iFn = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
1039	long iArgc = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
1040	long iArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(TREE_CHAIN(hAttrArgs))));
1041	dprintf(" iFn=%ld iArgc=%ld iArgs=%ld", iFn, iArgc, iArgs);
1042
1043	tree hType = *phOnNode;
1044	dprintf(" hType=%p %s(%d)\n", hType, get_tree_code_name(TREE_CODE(hType)), TREE_CODE(hType));
1045
1046	if (pfDontAddAttrib)
1047	*pfDontAddAttrib = false;
1048	return NULL_TREE;
1049	}
1050
1051
1052	/**
1053	* Called when we can register attributes.
1054	*
1055	* @param pvEventData Ignored.
1056	* @param pvUser Ignored.
1057	*/
1058	static void RegisterAttributesEvent(void pvEventData, void pvUser)
1059	{
1060	NOREF(pvEventData); NOREF(pvUser);
1061	dprintf("RegisterAttributesEvent: pvEventData=%p\n", pvEventData);
1062
1063	for (unsigned i = 0; i < RT_ELEMENTS(g_aAttribSpecs); i++)
1064	register_attribute(&g_aAttribSpecs[i]);
1065	}
1066
1067
1068	/**
1069	* The plug-in entry point.
1070	*
1071	* @returns 0 to indicate success?
1072	* @param pPlugInInfo Plugin info structure.
1073	* @param pGccVer GCC Version.
1074	*/
1075	int plugin_init(plugin_name_args pPlugInInfo, plugin_gcc_version pGccVer)
1076	{
1077	dprintf("plugin_init: %s\n", pPlugInInfo->full_name);
1078	dprintf("gcc version: basever=%s datestamp=%s devphase=%s revision=%s\n",
1079	pGccVer->basever, pGccVer->datestamp, pGccVer->devphase, pGccVer->revision);
1080
1081	/* Ask for callback in which we may register the attribute. */
1082	register_callback(pPlugInInfo->base_name, PLUGIN_ATTRIBUTES, RegisterAttributesEvent, NULL /pvUser/);
1083
1084	/* Register our pass. */
1085	#if RT_GNUC_PREREQ(4, 9)
1086	/** The registration info for my pass. */
1087	struct register_pass_info MyPassInfo;
1088	MyPassInfo.pass = new MyPass(g);
1089	MyPassInfo.reference_pass_name = "ssa";
1090	MyPassInfo.ref_pass_instance_number = 1;
1091	MyPassInfo.pos_op = PASS_POS_INSERT_BEFORE;
1092	register_callback(pPlugInInfo->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &MyPassInfo);
1093	#else
1094	register_callback(pPlugInInfo->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, (void *)&g_MyPassInfo);
1095	#endif
1096
1097	/* Register plug-in info. */
1098	register_callback(pPlugInInfo->base_name, PLUGIN_INFO, NULL, (void *)&g_PlugInInfo);
1099
1100	return 0;
1101	}
1102
1103
1104
1105
1106	/*
1107	*
1108	* Functions used by the common code.
1109	* Functions used by the common code.
1110	* Functions used by the common code.
1111	*
1112	*/
1113
1114	void VFmtChkWarnFmt(PVFMTCHKSTATE pState, const char pszLoc, const char pszFormat, ...)
1115	{
1116	char szTmp[1024];
1117	va_list va;
1118	va_start(va, pszFormat);
1119	vsnprintf(szTmp, sizeof(szTmp), pszFormat, va);
1120	va_end(va);
1121
1122	/* display the warning. */
1123	warning_at(MyGetFormatStringLocation(pState, pszLoc), 0, "%s", szTmp);
1124	}
1125
1126
1127	void VFmtChkErrFmt(PVFMTCHKSTATE pState, const char pszLoc, const char pszFormat, ...)
1128	{
1129	char szTmp[1024];
1130	va_list va;
1131	va_start(va, pszFormat);
1132	vsnprintf(szTmp, sizeof(szTmp), pszFormat, va);
1133	va_end(va);
1134
1135	/* display the warning. */
1136	error_at(MyGetFormatStringLocation(pState, pszLoc), "%s", szTmp);
1137	}
1138
1139
1140
1141	void VFmtChkVerifyEndOfArgs(PVFMTCHKSTATE pState, unsigned iArg)
1142	{
1143	dprintf("VFmtChkVerifyEndOfArgs: iArg=%u iArgs=%ld cArgs=%u\n", iArg, pState->iArgs, gimple_call_num_args(pState->hStmt));
1144	if (pState->iArgs > 0)
1145	{
1146	iArg += pState->iArgs - 1;
1147	unsigned cArgs = gimple_call_num_args(pState->hStmt);
1148	if (iArg == cArgs)
1149	{ /* fine */ }
1150	else if (iArg < cArgs)
1151	{
1152	tree hArg = gimple_call_arg(pState->hStmt, iArg);
1153	if (cArgs - iArg > 1)
1154	error_at(MY_LOC(hArg, pState), "%u extra arguments not consumed by format string", cArgs - iArg);
1155	else if ( TREE_CODE(hArg) != INTEGER_CST
1156	\|\| !MY_DOUBLE_INT_FITS_SHWI(hArg)
1157	\|\| MY_DOUBLE_INT_TO_SHWI(hArg) != -99) /* ignore final dummy argument: ..., -99); */
1158	error_at(MY_LOC(hArg, pState), "one extra argument not consumed by format string");
1159	}
1160	/* This should be handled elsewhere, but just in case. */
1161	else if (iArg - 1 == cArgs)
1162	error_at(pState->hFmtLoc, "one argument too few");
1163	else
1164	error_at(pState->hFmtLoc, "%u arguments too few", iArg - cArgs);
1165	}
1166	}
1167
1168
1169	bool VFmtChkRequirePresentArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
1170	{
1171	if (pState->iArgs > 0)
1172	{
1173	iArg += pState->iArgs - 1;
1174	unsigned cArgs = gimple_call_num_args(pState->hStmt);
1175	if (iArg >= cArgs)
1176	{
1177	VFmtChkErrFmt(pState, pszLoc, "Missing argument! %s", pszMessage);
1178	return false;
1179	}
1180
1181	tree hArg = gimple_call_arg(pState->hStmt, iArg);
1182	tree hType = TREE_TYPE(hArg);
1183	dprintf("arg%u: hArg=%p [%s] hType=%p [%s] cls=%s\n", iArg, hArg, get_tree_code_name(TREE_CODE(hArg)),
1184	hType, get_tree_code_name(TREE_CODE(hType)), tree_code_class_strings[TREE_CODE_CLASS(TREE_CODE(hType))]);
1185	dprintf(" nm=%p\n", TYPE_NAME(hType));
1186	dprintf(" cBits=%p %s value=%ld\n", TYPE_SIZE(hType), get_tree_code_name(TREE_CODE(TYPE_SIZE(hType))),
1187	MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE(hType)) );
1188	dprintf(" unit=%p %s value=%ld\n", TYPE_SIZE_UNIT(hType), get_tree_code_name(TREE_CODE(TYPE_SIZE_UNIT(hType))),
1189	MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE_UNIT(hType)) );
1190	tree hTypeNm = TYPE_NAME(hType);
1191	if (hTypeNm)
1192	dprintf(" typenm=%p %s '%s'\n", hTypeNm, get_tree_code_name(TREE_CODE(hTypeNm)),
1193	IDENTIFIER_POINTER(DECL_NAME(hTypeNm)));
1194	}
1195	return true;
1196	}
1197
1198
1199	bool VFmtChkRequireIntArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
1200	{
1201	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
1202	{
1203	/** @todo type check. */
1204	return true;
1205	}
1206	return false;
1207	}
1208
1209
1210	bool VFmtChkRequireStringArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
1211	{
1212	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
1213	{
1214	/** @todo type check. */
1215	return true;
1216	}
1217	return false;
1218	}
1219
1220
1221	bool VFmtChkRequireVaListPtrArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
1222	{
1223	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
1224	{
1225	/** @todo type check. */
1226	return true;
1227	}
1228	return false;
1229	}
1230
1231
1232	void VFmtChkHandleReplacementFormatString(PVFMTCHKSTATE pState, const char *pszPctM, unsigned iArg)
1233	{
1234	if (pState->iArgs > 0)
1235	{
1236	pState->iFmt = pState->iArgs + iArg;
1237	pState->iArgs = pState->iFmt + 1;
1238	pState->fMaybeNull = false;
1239	MyCheckFormatRecursive(pState, gimple_call_arg(pState->hStmt, pState->iFmt - 1));
1240	}
1241	}
1242
1243
1244	const char *VFmtChkGetFmtLocFile(PVFMTCHKSTATE pState)
1245	{
1246	return LOCATION_FILE(pState->hFmtLoc);
1247	}
1248
1249
1250	unsigned int VFmtChkGetFmtLocLine(PVFMTCHKSTATE pState)
1251	{
1252	return LOCATION_LINE(pState->hFmtLoc);
1253	}
1254
1255
1256	unsigned int VFmtChkGetFmtLocColumn(PVFMTCHKSTATE pState)
1257	{
1258	#ifdef LOCATION_COLUMN
1259	return LOCATION_COLUMN(pState->hFmtLoc);
1260	#else
1261	return 1;
1262	#endif
1263	}
1264

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

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