VBoxCompilerPlugInsGcc.cpp@ 85239

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1	/* $Id: VBoxCompilerPlugInsGcc.cpp 82968 2020-02-04 10:35:17Z 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 __GNUC__ == 4 && __GNUC_MINOR__ == 5
52	}
53	#endif
54
55	#include "VBoxCompilerPlugIns.h"
56
57
58	/*********************************************************************************************************************************
59	* Global Variables *
60	*********************************************************************************************************************************/
61	/** License indicator. */
62	int plugin_is_GPL_compatible;
63
64
65	/*********************************************************************************************************************************
66	* Defined Constants And Macros *
67	*********************************************************************************************************************************/
68	/** Convencience macro not present in earlier gcc versions. */
69	#ifndef VAR_P
70	# define VAR_P(a_hNode) (TREE_CODE(a_hNode) == VAR_DECL)
71	#endif
72	/** Replacement for the 4.9.0 get_tree_code_name function. */
73	#if !RT_GNUC_PREREQ(4, 9)
74	# define get_tree_code_name(a_enmTreeCode) (tree_code_name[a_enmTreeCode])
75	#endif
76
77
78	/** For use with messages.
79	* @todo needs some more work... Actually, seems we're a bit handicapped by
80	* working on gimplified stuff. */
81	#define MY_LOC(a_hPreferred, a_pState) EXPR_LOC_OR_LOC(a_hPreferred, (a_pState)->hFmtLoc)
82
83	/** @name Compatibility glue
84	* @{ */
85	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
86	# define linemap_location_from_macro_expansion_p(a, b) false
87	#endif
88	#if __GNUC__ == 4 && __GNUC_MINOR__ == 5
89	static tree gimple_call_fntype(gimple hStmt)
90	{
91	tree hDecl = gimple_call_fndecl(hStmt);
92	if (hDecl)
93	return TREE_TYPE(hDecl);
94	hDecl = gimple_call_fn(hStmt);
95	if (TREE_CODE(hDecl) == OBJ_TYPE_REF)
96	hDecl = OBJ_TYPE_REF_EXPR(hDecl);
97	if (DECL_P(hDecl))
98	{
99	tree hType = TREE_TYPE(hDecl);
100	if (POINTER_TYPE_P(hType))
101	hType = TREE_TYPE(hType);
102	return hType;
103	}
104	return NULL_TREE; /* caller bitches about this*/
105	}
106	#endif
107
108	///* Integer to HOST_WIDE_INT conversion fun. */
109	//#if RT_GNUC_PREREQ(4, 6)
110	//# define MY_INT_FITS_SHWI(hNode) (hNode).fits_shwi()
111	//# define MY_INT_TO_SHWI(hNode) (hNode).to_shwi()
112	//#else
113	//# define MY_INT_FITS_SHWI(hNode) double_int_fits_in_shwi_p(hNode)
114	//# define MY_INT_TO_SHWI(hNode) double_int_to_shwi(hNode)
115	//#endif
116
117	/* Integer to HOST_WIDE_INT conversion fun. */
118	#if RT_GNUC_PREREQ(5, 1)
119	# define MY_DOUBLE_INT_FITS_SHWI(hNode) tree_fits_shwi_p(hNode)
120	# define MY_DOUBLE_INT_TO_SHWI(hNode) tree_to_shwi(hNode)
121	#elif RT_GNUC_PREREQ(4, 6)
122	# define MY_DOUBLE_INT_FITS_SHWI(hNode) (TREE_INT_CST(hNode).fits_shwi())
123	# define MY_DOUBLE_INT_TO_SHWI(hNode) (TREE_INT_CST(hNode).to_shwi())
124	#else
125	# define MY_DOUBLE_INT_FITS_SHWI(hNode) double_int_fits_in_shwi_p(TREE_INT_CST(hNode))
126	# define MY_DOUBLE_INT_TO_SHWI(hNode) double_int_to_shwi(TREE_INT_CST(hNode))
127	#endif
128
129	#ifndef EXPR_LOC_OR_LOC
130	# define EXPR_LOC_OR_LOC(a,b) (b)
131	#endif
132	/** @} */
133
134
135	/*********************************************************************************************************************************
136	* Internal Functions *
137	*********************************************************************************************************************************/
138	static bool MyPassGateCallback(void);
139	static unsigned int MyPassExecuteCallback(void);
140	static unsigned int MyPassExecuteCallbackWithFunction(struct function *pFun);
141	static tree AttributeHandler(tree , tree, tree, int, bool );
142
143
144	/*********************************************************************************************************************************
145	* Global Variables *
146	*********************************************************************************************************************************/
147	/** Plug-in info. */
148	static const struct plugin_info g_PlugInInfo =
149	{
150	version: "0.0.0-ALPHA",
151	help : "Implements the __iprt_format__ attribute for checking format strings and arguments."
152	};
153
154	#if RT_GNUC_PREREQ(4, 9)
155	/** My pass. */
156	static const pass_data g_MyPassData =
157	{
158	type : GIMPLE_PASS,
159	name : "iprt-format-checks", / asterisk = no dump */
160	optinfo_flags : 0,
161	tv_id : TV_NONE,
162	properties_required : 0,
163	properties_provided : 0,
164	properties_destroyed : 0,
165	todo_flags_start : 0,
166	todo_flags_finish : 0,
167	};
168
169	class MyPass : public gimple_opt_pass
170	{
171	public:
172	MyPass(gcc::context *pCtx) : gimple_opt_pass(g_MyPassData, pCtx)
173	{ }
174
175	virtual bool gate(function *pFun)
176	{
177	NOREF(pFun);
178	return MyPassGateCallback();
179	}
180
181	virtual unsigned int execute(function *pFun)
182	{
183	NOREF(pFun);
184	return MyPassExecuteCallbackWithFunction(pFun);
185	}
186	};
187
188	#else /* < 4.9.0 */
189
190	/** My pass. */
191	static struct gimple_opt_pass g_MyPass =
192	{
193	pass:
194	{
195	type : GIMPLE_PASS,
196	name : "iprt-format-checks", / asterisk = no dump */
197	# if __GNUC__ != 4 \|\| __GNUC_MINOR__ != 5
198	optinfo_flags : 0,
199	# endif
200	gate : MyPassGateCallback,
201	execute : MyPassExecuteCallback,
202	sub : NULL,
203	next : NULL,
204	static_pass_number : 0,
205	tv_id : TV_NONE,
206	properties_required : 0,
207	properties_provided : 0,
208	properties_destroyed : 0,
209	todo_flags_start : 0,
210	todo_flags_finish : 0,
211	}
212	};
213
214	/** The registration info for my pass. */
215	static const struct register_pass_info g_MyPassInfo =
216	{
217	pass : &g_MyPass.pass,
218	reference_pass_name : "ssa",
219	ref_pass_instance_number : 1,
220	pos_op : PASS_POS_INSERT_BEFORE,
221	};
222
223	#endif /* < 4.9.0 */
224
225
226	/** Attribute specifications. */
227	static const struct attribute_spec g_AttribSpecs[] =
228	{
229	{
230	name : "iprt_format",
231	min_length : 2,
232	max_length : 2,
233	decl_required : false,
234	type_required : true,
235	function_type_required : true,
236	handler : AttributeHandler,
237	#if __GNUC__ != 4 \|\| __GNUC_MINOR__ != 5
238	affects_type_identity : false
239	#endif
240	},
241	{
242	name : "iprt_format_maybe_null",
243	min_length : 2,
244	max_length : 2,
245	decl_required : false,
246	type_required : true,
247	function_type_required : true,
248	handler : AttributeHandler,
249	#if __GNUC__ != 4 \|\| __GNUC_MINOR__ != 5
250	affects_type_identity : false
251	#endif
252	}
253	};
254
255
256	#ifdef DEBUG
257
258	/**
259	* Debug function for printing the scope of a decl.
260	* @param hDecl Declaration to print scope for.
261	*/
262	static void dprintScope(tree hDecl)
263	{
264	# if 0 /* later? */
265	tree hScope = CP_DECL_CONTEXT(hDecl);
266	if (hScope == global_namespace)
267	return;
268	if (TREE_CODE(hScope) == RECORD_TYPE)
269	hScope = TYPE_NAME(hScope);
270
271	/* recurse */
272	dprintScope(hScope);
273
274	/* name the scope. */
275	dprintf("::%s", DECL_NAME(hScope) ? IDENTIFIER_POINTER(DECL_NAME(hScope)) : "<noname>");
276	# endif
277	}
278
279
280	/**
281	* Debug function for printing a declaration.
282	* @param hDecl The declaration to print.
283	*/
284	static void dprintDecl(tree hDecl)
285	{
286	enum tree_code const enmDeclCode = TREE_CODE(hDecl);
287	tree const hType = TREE_TYPE(hDecl);
288	enum tree_code const enmTypeCode = hType ? TREE_CODE(hType) : (enum tree_code)-1;
289	#if 0
290	if ( enmTypeCode == RECORD_TYPE
291	&& enmDeclCode == TYPE_DECL
292	&& DECL_ARTIFICIAL(hDecl))
293	dprint_class(hType);
294	#endif
295
296	dprintf("%s ", get_tree_code_name(enmDeclCode));
297	dprintScope(hDecl);
298	dprintf("::%s", DECL_NAME(hDecl) ? IDENTIFIER_POINTER(DECL_NAME(hDecl)) : "<noname>");
299	if (hType)
300	dprintf(" type %s", get_tree_code_name(enmTypeCode));
301	dprintf(" @%s:%d", DECL_SOURCE_FILE(hDecl), DECL_SOURCE_LINE(hDecl));
302	}
303
304	#endif /* DEBUG */
305
306
307	static location_t MyGetLocationPlusColumnOffset(location_t hLoc, unsigned int offColumn)
308	{
309	/*
310	* Skip NOOPs, reserved locations and macro expansion.
311	*/
312	if ( offColumn != 0
313	&& hLoc >= RESERVED_LOCATION_COUNT
314	&& !linemap_location_from_macro_expansion_p(line_table, hLoc))
315	{
316	#if __GNUC__ >= 5 /** @todo figure this... */
317	/*
318	* There is an API for doing this, nice.
319	*/
320	location_t hNewLoc = linemap_position_for_loc_and_offset(line_table, hLoc, offColumn);
321	if (hNewLoc && hNewLoc != hLoc)
322	{
323	dprintf("MyGetLocationPlusColumnOffset: hNewLoc=%#x hLoc=%#x offColumn=%u\n", hNewLoc, hLoc, offColumn);
324	return hNewLoc;
325	}
326
327	#elif __GNUC_MINOR__ > 5
328	/*
329	* Have to do the job ourselves, it seems. This is a bit hairy...
330	*/
331	line_map const *pMap = NULL;
332	location_t hLoc2 = linemap_resolve_location(line_table, hLoc, LRK_SPELLING_LOCATION, &pMap);
333	if (hLoc2)
334	hLoc = hLoc2;
335
336	/* Guard against wrap arounds and overlaps. */
337	if ( hLoc + offColumn > MAP_START_LOCATION(pMap) /** @todo Use MAX_SOURCE_LOCATION? */
338	&& ( pMap == LINEMAPS_LAST_ORDINARY_MAP(line_table)
339	\|\| hLoc + offColumn < MAP_START_LOCATION((pMap + 1))))
340	{
341	/* Calc new column and check that it's within the valid range. */
342	unsigned int uColumn = SOURCE_COLUMN(pMap, hLoc) + offColumn;
343	if (uColumn < RT_BIT_32(ORDINARY_MAP_NUMBER_OF_COLUMN_BITS(pMap)))
344	{
345	/* Try add the position. If we get a valid result, replace the location. */
346	source_location hNewLoc = linemap_position_for_line_and_column((line_map *)pMap, SOURCE_LINE(pMap, hLoc), uColumn);
347	if ( hNewLoc <= line_table->highest_location
348	&& linemap_lookup(line_table, hNewLoc) != NULL)
349	{
350	dprintf("MyGetLocationPlusColumnOffset: hNewLoc=%#x hLoc=%#x offColumn=%u uColumn=%u\n",
351	hNewLoc, hLoc, offColumn, uColumn);
352	return hNewLoc;
353	}
354	}
355	}
356	#endif
357	}
358	dprintf("MyGetLocationPlusColumnOffset: taking fallback\n");
359	return hLoc;
360	}
361
362
363	static location_t MyGetFormatStringLocation(PVFMTCHKSTATE pState, const char *pszLoc)
364	{
365	location_t hLoc = pState->hFmtLoc;
366	#if RT_GNUC_PREREQ(4,6)
367	intptr_t offString = pszLoc - pState->pszFmt;
368	if ( offString >= 0
369	&& !linemap_location_from_macro_expansion_p(line_table, hLoc))
370	{
371	unsigned uCol = 1 + offString;
372	expanded_location XLoc = expand_location_to_spelling_point(hLoc);
373	int cchLine = 0;
374	# if RT_GNUC_PREREQ(6,0)
375	const char *pszLine = location_get_source_line(XLoc.file, XLoc.line, &cchLine);
376	# elif RT_GNUC_PREREQ(5,0)
377	const char *pszLine = location_get_source_line(XLoc, &cchLine);
378	# else
379	const char *pszLine = location_get_source_line(XLoc);
380	if (pszLine)
381	{
382	const char *pszEol = strpbrk(pszLine, "\n\r");
383	if (!pszEol)
384	pszEol = strchr(pszLine, '\0');
385	cchLine = (int)(pszEol - pszLine);
386	}
387	# endif
388	if (pszLine)
389	{
390	/** @todo Adjust the position by parsing the source. */
391	pszLine += XLoc.column - 1;
392	cchLine -= XLoc.column - 1;
393	}
394
395	hLoc = MyGetLocationPlusColumnOffset(hLoc, uCol);
396	}
397	#endif
398	return hLoc;
399	}
400
401
402	/**
403	* Non-recursive worker for MyCheckFormatRecursive.
404	*
405	* This will attempt to result @a hFmtArg into a string literal which it then
406	* passes on to MyCheckFormatString for the actual analyzis.
407	*
408	* @param pState The format string checking state.
409	* @param hFmtArg The format string node.
410	*/
411	DECL_NO_INLINE(static, void) MyCheckFormatNonRecursive(PVFMTCHKSTATE pState, tree hFmtArg)
412	{
413	dprintf("checker: hFmtArg=%p %s\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)));
414
415	/*
416	* Try resolve variables into constant strings.
417	*/
418	if (VAR_P(hFmtArg))
419	{
420	hFmtArg = decl_constant_value(hFmtArg);
421	STRIP_NOPS(hFmtArg); /* Used as argument and assigned call result. */
422	dprintf("checker1: variable => hFmtArg=%p %s\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)));
423	}
424
425	/*
426	* Fend off NULLs.
427	*/
428	if (integer_zerop(hFmtArg))
429	{
430	if (pState->fMaybeNull)
431	VFmtChkVerifyEndOfArgs(pState, 0);
432	else
433	error_at(MY_LOC(hFmtArg, pState), "Format string should not be NULL");
434	}
435	/*
436	* Need address expression to get any further.
437	*/
438	else if (TREE_CODE(hFmtArg) != ADDR_EXPR)
439	dprintf("checker1: Not address expression (%s)\n", get_tree_code_name(TREE_CODE(hFmtArg)));
440	else
441	{
442	pState->hFmtLoc = EXPR_LOC_OR_LOC(hFmtArg, pState->hFmtLoc);
443	hFmtArg = TREE_OPERAND(hFmtArg, 0);
444
445	/*
446	* Deal with fixed string indexing, if possible.
447	*/
448	HOST_WIDE_INT off = 0;
449	if ( TREE_CODE(hFmtArg) == ARRAY_REF
450	&& MY_DOUBLE_INT_FITS_SHWI(TREE_OPERAND(hFmtArg, 1))
451	&& MY_DOUBLE_INT_FITS_SHWI(TREE_OPERAND(hFmtArg, 1)) )
452	{
453	off = MY_DOUBLE_INT_TO_SHWI(TREE_OPERAND(hFmtArg, 1));
454	if (off < 0)
455	{
456	dprintf("checker1: ARRAY_REF, off=%ld\n", off);
457	return;
458	}
459	hFmtArg = TREE_OPERAND(hFmtArg, 0);
460	dprintf("checker1: ARRAY_REF => hFmtArg=%p %s, off=%ld\n", hFmtArg, get_tree_code_name(TREE_CODE(hFmtArg)), off);
461	}
462
463	/*
464	* Deal with static const char g_szFmt[] = "qwerty"; Take care as
465	* the actual string constant may not necessarily include the terminator.
466	*/
467	tree hArraySize = NULL_TREE;
468	if ( VAR_P(hFmtArg)
469	&& TREE_CODE(TREE_TYPE(hFmtArg)) == ARRAY_TYPE)
470	{
471	tree hArrayInitializer = decl_constant_value(hFmtArg);
472	if ( hArrayInitializer != hFmtArg
473	&& TREE_CODE(hArrayInitializer) == STRING_CST)
474	{
475	hArraySize = DECL_SIZE_UNIT(hFmtArg);
476	hFmtArg = hArrayInitializer;
477	}
478	}
479
480	/*
481	* Are we dealing with a string literal now?
482	*/
483	if (TREE_CODE(hFmtArg) != STRING_CST)
484	dprintf("checker1: Not string literal (%s)\n", get_tree_code_name(TREE_CODE(hFmtArg)));
485	else if (TYPE_MAIN_VARIANT(TREE_TYPE(TREE_TYPE(hFmtArg))) != char_type_node)
486	warning_at(pState->hFmtLoc, 0, "expected 'char' type string literal");
487	else
488	{
489	/*
490	* Yes we are, so get the pointer to the string and its length.
491	*/
492	const char *pszFmt = TREE_STRING_POINTER(hFmtArg);
493	int cchFmt = TREE_STRING_LENGTH(hFmtArg);
494
495	/* Adjust cchFmt to the initialized array size if appropriate. */
496	if (hArraySize != NULL_TREE)
497	{
498	if (TREE_CODE(hArraySize) != INTEGER_CST)
499	warning_at(pState->hFmtLoc, 0, "Expected integer array size (not %s)", get_tree_code_name(TREE_CODE(hArraySize)));
500	else if (!MY_DOUBLE_INT_FITS_SHWI(hArraySize))
501	warning_at(pState->hFmtLoc, 0, "Unexpected integer overflow in array size constant");
502	else
503	{
504	HOST_WIDE_INT cbArray = MY_DOUBLE_INT_TO_SHWI(hArraySize);
505	if ( cbArray <= 0
506	\|\| cbArray != (int)cbArray)
507	warning_at(pState->hFmtLoc, 0, "Unexpected integer array size constant value: %ld", cbArray);
508	else if (cchFmt > cbArray)
509	{
510	dprintf("checker1: cchFmt=%d => cchFmt=%ld (=cbArray)\n", cchFmt, cbArray);
511	cchFmt = (int)cbArray;
512	}
513	}
514	}
515
516	/* Apply the offset, if given. */
517	if (off)
518	{
519	if (off >= cchFmt)
520	{
521	dprintf("checker1: off=%ld >= cchFmt=%d -> skipping\n", off, cchFmt);
522	return;
523	}
524	pszFmt += off;
525	cchFmt -= (int)off;
526	}
527
528	/*
529	* Check for unterminated strings.
530	*/
531	if ( cchFmt < 1
532	\|\| pszFmt[cchFmt - 1] != '\0')
533	warning_at(pState->hFmtLoc, 0, "Unterminated format string (cchFmt=%d)", cchFmt);
534	/*
535	* Call worker to check the actual string.
536	*/
537	else
538	MyCheckFormatCString(pState, pszFmt);
539	}
540	}
541	}
542
543
544	/**
545	* Deal recursively with special format string constructs.
546	*
547	* This will call MyCheckFormatNonRecursive to validate each format string.
548	*
549	* @param pState The format string checking state.
550	* @param hFmtArg The format string node.
551	*/
552	static void MyCheckFormatRecursive(PVFMTCHKSTATE pState, tree hFmtArg)
553	{
554	/*
555	* Catch wrong attribute use.
556	*/
557	if (hFmtArg == NULL_TREE)
558	error_at(pState->hFmtLoc, "IPRT format attribute is probably used incorrectly (hFmtArg is NULL)");
559	/*
560	* NULL format strings may cause crashes.
561	*/
562	else if (integer_zerop(hFmtArg))
563	{
564	if (pState->fMaybeNull)
565	VFmtChkVerifyEndOfArgs(pState, 0);
566	else
567	error_at(MY_LOC(hFmtArg, pState), "Format string should not be NULL");
568	}
569	/*
570	* Check both branches of a ternary operator.
571	*/
572	else if (TREE_CODE(hFmtArg) == COND_EXPR)
573	{
574	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 1));
575	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 2));
576	}
577	/*
578	* Strip coercion.
579	*/
580	else if ( CONVERT_EXPR_P(hFmtArg)
581	&& TYPE_PRECISION(TREE_TYPE(hFmtArg)) == TYPE_PRECISION(TREE_TYPE(TREE_OPERAND(hFmtArg, 0))) )
582	MyCheckFormatRecursive(pState, TREE_OPERAND(hFmtArg, 0));
583	/*
584	* We're good, hand it to the non-recursive worker.
585	*/
586	else
587	MyCheckFormatNonRecursive(pState, hFmtArg);
588	}
589
590
591	#if !RT_GNUC_PREREQ(4, 9)
592	/**
593	* Execute my pass.
594	* @returns Flags indicates stuff todo, we return 0.
595	*/
596	static unsigned int MyPassExecuteCallback(void)
597	{
598	return MyPassExecuteCallbackWithFunction(cfun);
599	}
600	#endif
601
602	/**
603	* Execute my pass.
604	* @returns Flags indicates stuff todo, we return 0.
605	*/
606	static unsigned int MyPassExecuteCallbackWithFunction(struct function *pFun)
607	{
608	dprintf("MyPassExecuteCallback:\n");
609
610	/*
611	* Enumerate the basic blocks.
612	*/
613	basic_block hBasicBlock;
614	FOR_EACH_BB_FN(hBasicBlock, pFun)
615	{
616	dprintf(" hBasicBlock=%p\n", hBasicBlock);
617
618	/*
619	* Enumerate the statements in the current basic block.
620	* We're interested in calls to functions with the __iprt_format__ attribute.
621	*/
622	for (gimple_stmt_iterator hStmtItr = gsi_start_bb(hBasicBlock); !gsi_end_p(hStmtItr); gsi_next(&hStmtItr))
623	{
624	#if RT_GNUC_PREREQ(6, 0)
625	const gimple * const hStmt = gsi_stmt(hStmtItr);
626	#else
627	gimple const hStmt = gsi_stmt(hStmtItr);
628	#endif
629
630	enum gimple_code const enmCode = gimple_code(hStmt);
631	#ifdef DEBUG
632	unsigned const cOps = gimple_num_ops(hStmt);
633	dprintf(" hStmt=%p %s (%d) ops=%d\n", hStmt, gimple_code_name[enmCode], enmCode, cOps);
634	for (unsigned iOp = 0; iOp < cOps; iOp++)
635	{
636	tree const hOp = gimple_op(hStmt, iOp);
637	if (hOp)
638	dprintf(" %02d: %p, code %s(%d)\n", iOp, hOp, get_tree_code_name(TREE_CODE(hOp)), TREE_CODE(hOp));
639	else
640	dprintf(" %02d: NULL_TREE\n", iOp);
641	}
642	#endif
643	if (enmCode == GIMPLE_CALL)
644	{
645	/*
646	* Check if the function type has the __iprt_format__ attribute.
647	*/
648	tree const hFn = gimple_call_fn(hStmt);
649	dprintf(" hFn =%p %s(%d); args=%d\n",
650	hFn, hFn ? get_tree_code_name(TREE_CODE(hFn)) : NULL, hFn ? TREE_CODE(hFn) : - 1,
651	gimple_call_num_args(hStmt));
652	#ifdef DEBUG
653	if (hFn && DECL_P(hFn))
654	dprintf(" hFn is decl: %s %s:%d\n",
655	DECL_NAME(hFn) ? IDENTIFIER_POINTER(DECL_NAME(hFn)) : "<unamed>",
656	DECL_SOURCE_FILE(hFn), DECL_SOURCE_LINE(hFn));
657	#endif
658	tree const hFnDecl = gimple_call_fndecl(hStmt);
659	if (hFnDecl)
660	dprintf(" hFnDecl=%p %s(%d) %s type=%p %s:%d\n",
661	hFnDecl, get_tree_code_name(TREE_CODE(hFnDecl)), TREE_CODE(hFnDecl),
662	DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
663	TREE_TYPE(hFnDecl), DECL_SOURCE_FILE(hFnDecl), DECL_SOURCE_LINE(hFnDecl));
664	tree const hFnType = gimple_call_fntype(hStmt);
665	if (hFnType == NULL_TREE)
666	{
667	if ( hFnDecl == NULL_TREE
668	&& gimple_call_internal_p(hStmt) /* va_arg() kludge */)
669	continue;
670	error_at(gimple_location(hStmt), "Failed to resolve function type [fn=%s fndecl=%s]\n",
671	hFn ? get_tree_code_name(TREE_CODE(hFn)) : "<null>",
672	hFnDecl ? get_tree_code_name(TREE_CODE(hFnDecl)) : "<null>");
673	}
674	else if (POINTER_TYPE_P(hFnType))
675	error_at(gimple_location(hStmt), "Got a POINTER_TYPE when expecting a function type [fn=%s]\n",
676	get_tree_code_name(TREE_CODE(hFn)));
677	if (hFnType)
678	dprintf(" hFnType=%p %s(%d) %s\n", hFnType, get_tree_code_name(TREE_CODE(hFnType)), TREE_CODE(hFnType),
679	TYPE_NAME(hFnType) && DECL_NAME(TYPE_NAME(hFnType))
680	? IDENTIFIER_POINTER(DECL_NAME(TYPE_NAME(hFnType))) : "<unamed>");
681
682	tree const hAttr = hFnType ? lookup_attribute("iprt_format", TYPE_ATTRIBUTES(hFnType)) : NULL_TREE;
683	tree const hAttrMaybe0 = hFnType ? lookup_attribute("iprt_format_maybe_null", TYPE_ATTRIBUTES(hFnType)) : NULL_TREE;
684	if (hAttr \|\| hAttrMaybe0)
685	{
686	/*
687	* Yeah, it has the attribute!
688	*/
689	tree const hAttrArgs = hAttr ? TREE_VALUE(hAttr) : TREE_VALUE(hAttrMaybe0);
690	VFMTCHKSTATE State;
691	State.iFmt = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
692	State.iArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
693	State.pszFmt = NULL;
694	State.fMaybeNull = hAttr == NULL_TREE;
695	State.hStmt = hStmt;
696	State.hFmtLoc = gimple_location(hStmt);
697	dprintf(" %s() __iprt_format%s__(iFmt=%ld, iArgs=%ld)\n",
698	hFnDecl && DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>",
699	State.fMaybeNull ? "_maybe_null" : "", State.iFmt, State.iArgs);
700
701	unsigned cCallArgs = gimple_call_num_args(hStmt);
702	if (cCallArgs >= State.iFmt)
703	MyCheckFormatRecursive(&State, gimple_call_arg(hStmt, State.iFmt - 1));
704	else
705	error_at(gimple_location(hStmt),
706	"Call has only %d arguments; %s() format string is argument #%lu (1-based), thus missing\n",
707	cCallArgs, DECL_NAME(hFnDecl) ? IDENTIFIER_POINTER(DECL_NAME(hFnDecl)) : "<unamed>", State.iFmt);
708	}
709	}
710	}
711	}
712	return 0;
713	}
714
715
716	/**
717	* Gate callback for my pass that indicates whether it should execute or not.
718	* @returns true to execute.
719	*/
720	static bool MyPassGateCallback(void)
721	{
722	dprintf("MyPassGateCallback:\n");
723	return true;
724	}
725
726
727	/**
728	* Validate the use of an attribute.
729	*
730	* @returns ??
731	* @param phOnNode The node the attribute is being used on.
732	* @param hAttrName The attribute name.
733	* @param hAttrArgs The attribute arguments.
734	* @param fFlags Some kind of flags...
735	* @param pfDontAddAttrib Whether to add the attribute to this node or not.
736	*/
737	static tree AttributeHandler(tree phOnNode, tree hAttrName, tree hAttrArgs, int fFlags, bool pfDontAddAttrib)
738	{
739	dprintf("AttributeHandler: name=%s fFlags=%#x", IDENTIFIER_POINTER(hAttrName), fFlags);
740	long iFmt = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(hAttrArgs));
741	long iArgs = MY_DOUBLE_INT_TO_SHWI(TREE_VALUE(TREE_CHAIN(hAttrArgs)));
742	dprintf(" iFmt=%ld iArgs=%ld", iFmt, iArgs);
743
744	tree hType = *phOnNode;
745	dprintf(" hType=%p %s(%d)\n", hType, get_tree_code_name(TREE_CODE(hType)), TREE_CODE(hType));
746
747	if (pfDontAddAttrib)
748	*pfDontAddAttrib = false;
749	return NULL_TREE;
750	}
751
752
753	/**
754	* Called when we can register attributes.
755	*
756	* @param pvEventData Ignored.
757	* @param pvUser Ignored.
758	*/
759	static void RegisterAttributesEvent(void pvEventData, void pvUser)
760	{
761	NOREF(pvEventData); NOREF(pvUser);
762	dprintf("RegisterAttributesEvent: pvEventData=%p\n", pvEventData);
763
764	register_attribute(&g_AttribSpecs[0]);
765	register_attribute(&g_AttribSpecs[1]);
766	}
767
768
769	/**
770	* The plug-in entry point.
771	*
772	* @returns 0 to indicate success?
773	* @param pPlugInInfo Plugin info structure.
774	* @param pGccVer GCC Version.
775	*/
776	int plugin_init(plugin_name_args pPlugInInfo, plugin_gcc_version pGccVer)
777	{
778	dprintf("plugin_init: %s\n", pPlugInInfo->full_name);
779	dprintf("gcc version: basever=%s datestamp=%s devphase=%s revision=%s\n",
780	pGccVer->basever, pGccVer->datestamp, pGccVer->devphase, pGccVer->revision);
781
782	/* Ask for callback in which we may register the attribute. */
783	register_callback(pPlugInInfo->base_name, PLUGIN_ATTRIBUTES, RegisterAttributesEvent, NULL /pvUser/);
784
785	/* Register our pass. */
786	#if RT_GNUC_PREREQ(4, 9)
787	/** The registration info for my pass. */
788	struct register_pass_info MyPassInfo;
789	MyPassInfo.pass = new MyPass(g);
790	MyPassInfo.reference_pass_name = "ssa";
791	MyPassInfo.ref_pass_instance_number = 1;
792	MyPassInfo.pos_op = PASS_POS_INSERT_BEFORE;
793	register_callback(pPlugInInfo->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &MyPassInfo);
794	#else
795	register_callback(pPlugInInfo->base_name, PLUGIN_PASS_MANAGER_SETUP, NULL, (void *)&g_MyPassInfo);
796	#endif
797
798	/* Register plug-in info. */
799	register_callback(pPlugInInfo->base_name, PLUGIN_INFO, NULL, (void *)&g_PlugInInfo);
800
801	return 0;
802	}
803
804
805
806
807	/*
808	*
809	* Functions used by the common code.
810	* Functions used by the common code.
811	* Functions used by the common code.
812	*
813	*/
814
815	void VFmtChkWarnFmt(PVFMTCHKSTATE pState, const char pszLoc, const char pszFormat, ...)
816	{
817	char szTmp[1024];
818	va_list va;
819	va_start(va, pszFormat);
820	vsnprintf(szTmp, sizeof(szTmp), pszFormat, va);
821	va_end(va);
822
823	/* display the warning. */
824	warning_at(MyGetFormatStringLocation(pState, pszLoc), 0, "%s", szTmp);
825	}
826
827
828	void VFmtChkErrFmt(PVFMTCHKSTATE pState, const char pszLoc, const char pszFormat, ...)
829	{
830	char szTmp[1024];
831	va_list va;
832	va_start(va, pszFormat);
833	vsnprintf(szTmp, sizeof(szTmp), pszFormat, va);
834	va_end(va);
835
836	/* display the warning. */
837	error_at(MyGetFormatStringLocation(pState, pszLoc), "%s", szTmp);
838	}
839
840
841
842	void VFmtChkVerifyEndOfArgs(PVFMTCHKSTATE pState, unsigned iArg)
843	{
844	dprintf("VFmtChkVerifyEndOfArgs: iArg=%u iArgs=%ld cArgs=%u\n", iArg, pState->iArgs, gimple_call_num_args(pState->hStmt));
845	if (pState->iArgs > 0)
846	{
847	iArg += pState->iArgs - 1;
848	unsigned cArgs = gimple_call_num_args(pState->hStmt);
849	if (iArg == cArgs)
850	{ /* fine */ }
851	else if (iArg < cArgs)
852	{
853	tree hArg = gimple_call_arg(pState->hStmt, iArg);
854	if (cArgs - iArg > 1)
855	error_at(MY_LOC(hArg, pState), "%u extra arguments not consumed by format string", cArgs - iArg);
856	else if ( TREE_CODE(hArg) != INTEGER_CST
857	\|\| !MY_DOUBLE_INT_FITS_SHWI(hArg)
858	\|\| MY_DOUBLE_INT_TO_SHWI(hArg) != -99) /* ignore final dummy argument: ..., -99); */
859	error_at(MY_LOC(hArg, pState), "one extra argument not consumed by format string");
860	}
861	/* This should be handled elsewhere, but just in case. */
862	else if (iArg - 1 == cArgs)
863	error_at(pState->hFmtLoc, "one argument too few");
864	else
865	error_at(pState->hFmtLoc, "%u arguments too few", iArg - cArgs);
866	}
867	}
868
869
870	bool VFmtChkRequirePresentArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
871	{
872	if (pState->iArgs > 0)
873	{
874	iArg += pState->iArgs - 1;
875	unsigned cArgs = gimple_call_num_args(pState->hStmt);
876	if (iArg >= cArgs)
877	{
878	VFmtChkErrFmt(pState, pszLoc, "Missing argument! %s", pszMessage);
879	return false;
880	}
881
882	tree hArg = gimple_call_arg(pState->hStmt, iArg);
883	tree hType = TREE_TYPE(hArg);
884	dprintf("arg%u: hArg=%p [%s] hType=%p [%s] cls=%s\n", iArg, hArg, get_tree_code_name(TREE_CODE(hArg)),
885	hType, get_tree_code_name(TREE_CODE(hType)), tree_code_class_strings[TREE_CODE_CLASS(TREE_CODE(hType))]);
886	dprintf(" nm=%p\n", TYPE_NAME(hType));
887	dprintf(" cb=%p %s value=%ld\n", TYPE_SIZE(hType), get_tree_code_name(TREE_CODE(TYPE_SIZE(hType))),
888	MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE(hType)) );
889	dprintf(" unit=%p %s value=%ld\n", TYPE_SIZE_UNIT(hType), get_tree_code_name(TREE_CODE(TYPE_SIZE_UNIT(hType))),
890	MY_DOUBLE_INT_TO_SHWI(TYPE_SIZE_UNIT(hType)) );
891	tree hTypeNm = TYPE_NAME(hType);
892	if (hTypeNm)
893	dprintf(" typenm=%p %s '%s'\n", hTypeNm, get_tree_code_name(TREE_CODE(hTypeNm)),
894	IDENTIFIER_POINTER(DECL_NAME(hTypeNm)));
895	}
896	return true;
897	}
898
899
900	bool VFmtChkRequireIntArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
901	{
902	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
903	{
904	/** @todo type check. */
905	return true;
906	}
907	return false;
908	}
909
910
911	bool VFmtChkRequireStringArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
912	{
913	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
914	{
915	/** @todo type check. */
916	return true;
917	}
918	return false;
919	}
920
921
922	bool VFmtChkRequireVaListPtrArg(PVFMTCHKSTATE pState, const char pszLoc, unsigned iArg, const char pszMessage)
923	{
924	if (VFmtChkRequirePresentArg(pState, pszLoc, iArg, pszMessage))
925	{
926	/** @todo type check. */
927	return true;
928	}
929	return false;
930	}
931
932
933	void VFmtChkHandleReplacementFormatString(PVFMTCHKSTATE pState, const char *pszPctM, unsigned iArg)
934	{
935	if (pState->iArgs > 0)
936	{
937	pState->iFmt = pState->iArgs + iArg;
938	pState->iArgs = pState->iFmt + 1;
939	pState->fMaybeNull = false;
940	MyCheckFormatRecursive(pState, gimple_call_arg(pState->hStmt, pState->iFmt - 1));
941	}
942	}
943
944
945	const char *VFmtChkGetFmtLocFile(PVFMTCHKSTATE pState)
946	{
947	return LOCATION_FILE(pState->hFmtLoc);
948	}
949
950
951	unsigned int VFmtChkGetFmtLocLine(PVFMTCHKSTATE pState)
952	{
953	return LOCATION_LINE(pState->hFmtLoc);
954	}
955
956
957	unsigned int VFmtChkGetFmtLocColumn(PVFMTCHKSTATE pState)
958	{
959	#ifdef LOCATION_COLUMN
960	return LOCATION_COLUMN(pState->hFmtLoc);
961	#else
962	return 1;
963	#endif
964	}
965

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source: vbox/trunk/src/bldprogs/VBoxCompilerPlugInsGcc.cpp@ 85239

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