summaryrefslogtreecommitdiffstats
path: root/compilerplugins/clang/salcall.cxx
blob: d2b4fc2bfb2b02c89660d14e1708d76f968070b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include "plugin.hxx"
#include "check.hxx"
#include "compat.hxx"
#include "functionaddress.hxx"

#include <algorithm>
#include <cassert>
#include <set>
#include <utility>
#include <vector>

// The SAL_CALL function annotation is only necessary on our outward
// facing C++ ABI, anywhere else it is just cargo-cult.
//

//TODO: To find inconsistencies like
//
//  template<typename> struct S { void f(); }; // #1
//  template<typename T> void S<T>::f() {} // #2
//  template void SAL_CALL S<void>::f();
//
// VisitFunctionDecl would need to also visit explicit instantiations, by letting
// shouldVisitTemplateInstantiations return true and returning from VisitFunctionDecl early iff
// decl->getTemplateSpecializationKind() == TSK_ImplicitInstantiation.  However, an instantiated
// FunctionDecl is created in TemplateDeclInstantiator::VisitCXXMethodDecl by copying information
// (including source locations) from the declaration at #1, and later modified in
// Sema::InstantiateFunctionDefinition with some source location information from the definition at
// #2.  That means that the source scanning in isSalCallFunction below would be thoroughly confused
// and break.  (This happens for both explicit and implicit template instantiations, which is the
// reason why calls to isSalCallFunction make sure to not call it with any FunctionDecls
// representing such template instantiations.)

namespace
{
//static bool startswith(const std::string& rStr, const char* pSubStr)
//{
//    return rStr.compare(0, strlen(pSubStr), pSubStr) == 0;
//}

CXXMethodDecl const* getTemplateInstantiationPattern(CXXMethodDecl const* decl)
{
    auto const p = decl->getTemplateInstantiationPattern();
    return p == nullptr ? decl : cast<CXXMethodDecl>(p);
}

class SalCall final : public loplugin::FunctionAddress<loplugin::FilteringRewritePlugin<SalCall>>
{
public:
    explicit SalCall(loplugin::InstantiationData const& data)
        : FunctionAddress(data)
    {
    }

    virtual void run() override
    {
        if (TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()))
        {
            auto const& addressOfSet = getFunctionsWithAddressTaken();
            for (auto const decl : m_decls)
            {
                if (addressOfSet.find(decl->getCanonicalDecl()) == addressOfSet.end())
                {
                    handleFunctionDecl(decl);
                }
            }
        }
    }

    bool VisitFunctionDecl(FunctionDecl const*);

private:
    void handleFunctionDecl(FunctionDecl const* decl);
    bool rewrite(SourceLocation);
    bool isSalCallFunction(FunctionDecl const* functionDecl, SourceLocation* pLoc = nullptr);

    std::set<FunctionDecl const*> m_decls;
};

bool SalCall::VisitFunctionDecl(FunctionDecl const* decl)
{
    if (ignoreLocation(decl))
        return true;

    // ignore template stuff
    if (decl->getTemplatedKind() != clang::FunctionDecl::TK_NonTemplate)
        return true;
    auto recordDecl = dyn_cast<CXXRecordDecl>(decl->getDeclContext());
    if (recordDecl
        && (recordDecl->getTemplateSpecializationKind() != TSK_Undeclared
            || recordDecl->isDependentContext()))
    {
        return true;
    }

    auto canonicalDecl = decl->getCanonicalDecl();

    // ignore UNO implementations
    if (isInUnoIncludeFile(
            compiler.getSourceManager().getSpellingLoc(canonicalDecl->getLocation())))
        return true;

    SourceLocation rewriteLoc;
    SourceLocation rewriteCanonicalLoc;
    bool bDeclIsSalCall = isSalCallFunction(decl, &rewriteLoc);
    bool bCanonicalDeclIsSalCall = isSalCallFunction(canonicalDecl, &rewriteCanonicalLoc);

    // first, check for consistency, so we don't trip ourselves up on Linux, where we normally run the plugin
    if (canonicalDecl != decl)
    {
        if (bCanonicalDeclIsSalCall)
            ; // this is fine, the actual definition have or not have SAL_CALL, and MSVC is fine with it
        else if (bDeclIsSalCall)
        {
            // not fine
            report(DiagnosticsEngine::Warning, "SAL_CALL inconsistency", decl->getLocation())
                << decl->getSourceRange();
            report(DiagnosticsEngine::Note, "SAL_CALL inconsistency", canonicalDecl->getLocation())
                << canonicalDecl->getSourceRange();
            return true;
        }
    }
    auto methodDecl = dyn_cast<CXXMethodDecl>(canonicalDecl);
    if (methodDecl)
    {
        for (auto iter = methodDecl->begin_overridden_methods();
             iter != methodDecl->end_overridden_methods(); ++iter)
        {
            const CXXMethodDecl* overriddenMethod
                = getTemplateInstantiationPattern(*iter)->getCanonicalDecl();
            if (bCanonicalDeclIsSalCall != isSalCallFunction(overriddenMethod))
            {
                report(DiagnosticsEngine::Warning, "SAL_CALL inconsistency",
                       methodDecl->getLocation())
                    << methodDecl->getSourceRange();
                report(DiagnosticsEngine::Note, "SAL_CALL inconsistency",
                       overriddenMethod->getLocation())
                    << overriddenMethod->getSourceRange();
                return true;
            }
        }
    }

    if (!bCanonicalDeclIsSalCall)
        return true;

    if (!decl->isThisDeclarationADefinition() && !(methodDecl && methodDecl->isPure()))
        return true;

    m_decls.insert(decl);
    return true;
}

void SalCall::handleFunctionDecl(FunctionDecl const* decl)
{
    // some base classes are overridden by sub-classes which override both the base-class and a UNO class
    if (auto recordDecl = dyn_cast<CXXRecordDecl>(decl->getDeclContext()))
    {
        auto dc = loplugin::DeclCheck(recordDecl);
        if (dc.Class("OProxyAggregation").Namespace("comphelper").GlobalNamespace()
            || dc.Class("OComponentProxyAggregationHelper")
                   .Namespace("comphelper")
                   .GlobalNamespace()
            || dc.Class("SvxShapeMaster").GlobalNamespace()
            || dc.Class("ListBoxAccessibleBase").Namespace("accessibility").GlobalNamespace()
            || dc.Class("AsyncEventNotifierBase").Namespace("comphelper").GlobalNamespace()
            || dc.Class("ODescriptor")
                   .Namespace("sdbcx")
                   .Namespace("connectivity")
                   .GlobalNamespace()
            || dc.Class("IController").Namespace("dbaui").GlobalNamespace()
            || dc.Class("ORowSetBase").Namespace("dbaccess").GlobalNamespace()
            || dc.Class("OComponentAdapterBase").Namespace("bib").GlobalNamespace()
            || dc.Class("IEventProcessor").Namespace("comphelper").GlobalNamespace()
            || dc.Class("SvxUnoTextBase").GlobalNamespace()
            || dc.Class("OInterfaceContainer").Namespace("frm").GlobalNamespace()
            || dc.Class("AccessibleComponentBase").Namespace("accessibility").GlobalNamespace()
            || dc.Class("ContextHandler2Helper")
                   .Namespace("core")
                   .Namespace("oox")
                   .GlobalNamespace()
            || dc.Class("AccessibleStaticTextBase").Namespace("accessibility").GlobalNamespace()
            || dc.Class("OCommonPicker").Namespace("svt").GlobalNamespace()
            || dc.Class("VbaDocumentBase").GlobalNamespace()
            || dc.Class("VbaPageSetupBase").GlobalNamespace()
            || dc.Class("ScVbaControl").GlobalNamespace()

        )
            return;
    }

    auto canonicalDecl = decl->getCanonicalDecl();

    // if any of the overridden methods are SAL_CALL, we should be too
    if (auto methodDecl = dyn_cast<CXXMethodDecl>(canonicalDecl))
    {
        for (auto iter = methodDecl->begin_overridden_methods();
             iter != methodDecl->end_overridden_methods(); ++iter)
        {
            const CXXMethodDecl* overriddenMethod
                = getTemplateInstantiationPattern(*iter)->getCanonicalDecl();
            if (isSalCallFunction(overriddenMethod))
                return;
        }
    }

    SourceLocation rewriteLoc;
    SourceLocation rewriteCanonicalLoc;
    bool bDeclIsSalCall = isSalCallFunction(decl, &rewriteLoc);
    isSalCallFunction(canonicalDecl, &rewriteCanonicalLoc);

    bool bOK = rewrite(rewriteLoc);
    if (bOK && canonicalDecl != decl)
    {
        bOK = rewrite(rewriteCanonicalLoc);
    }
    if (bOK)
        return;

    if (bDeclIsSalCall)
    {
        report(DiagnosticsEngine::Warning, "SAL_CALL unnecessary here",
               rewriteLoc.isValid() ? rewriteLoc : decl->getLocation())
            << decl->getSourceRange();
    }
    if (canonicalDecl != decl)
    {
        report(DiagnosticsEngine::Warning, "SAL_CALL unnecessary here", rewriteCanonicalLoc)
            << canonicalDecl->getSourceRange();
        if (!bDeclIsSalCall)
        {
            report(DiagnosticsEngine::Note, "defined here (without SAL_CALL decoration)",
                   decl->getLocation())
                << decl->getSourceRange();
        }
    }
}

//TODO: This doesn't handle all possible cases of macro usage (and possibly never will be able to),
// just what is encountered in practice:
bool SalCall::isSalCallFunction(FunctionDecl const* functionDecl, SourceLocation* pLoc)
{
    assert(!functionDecl->isTemplateInstantiation());

    //TODO:  It appears that FunctionDecls representing explicit template specializations have the
    // same issue as those representing (implicit or explicit) instantiations, namely that their
    // data (including relevant source locations) is an incoherent combination of data from the
    // original template declaration and the later specialization definition.  For example, for the
    // OValueLimitedType<double>::registerProperties specialization at
    // forms/source/xforms/datatyperepository.cxx:241, the FunctionDecl (which is even considered
    // canonic) representing the base-class function overridden by ODecimalType::registerProperties
    // (forms/source/xforms/datatypes.hxx:299) is dumped as
    //
    //  CXXMethodDecl <forms/source/xforms/datatypes.hxx:217:9, col:54>
    //   forms/source/xforms/datatyperepository.cxx:242:37 registerProperties 'void (void)' virtual
    //
    // mixing the source range ("datatypes.hxx:217:9, col:54") from the original declaration with
    // the name location ("datatyperepository.cxx:242:37") from the explicit specialization.  Just
    // give up for now and assume no "SAL_CALL" is present:
    if (functionDecl->getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
    {
        return false;
    }

    SourceManager& SM = compiler.getSourceManager();
    std::vector<SourceRange> ranges;

    SourceLocation startLoc;
    SourceLocation endLoc;
    bool noReturnType = isa<CXXConstructorDecl>(functionDecl)
                        || isa<CXXDestructorDecl>(functionDecl)
                        || isa<CXXConversionDecl>(functionDecl);
    bool startAfterReturnType = !noReturnType;
    if (startAfterReturnType)
    {
        // For functions that do have a return type, start searching for "SAL_CALL" after the return
        // type (which for SAL_CALL functions on Windows will be an AttributedTypeLoc, which the
        // implementation of FunctionDecl::getReturnTypeSourceRange does not take into account, so
        // do that here explicitly):
        auto const TSI = functionDecl->getTypeSourceInfo();
        if (TSI == nullptr)
        {
            if (isDebugMode())
            {
                report(DiagnosticsEngine::Fatal, "TODO: unexpected failure #1, needs investigation",
                       functionDecl->getLocation())
                    << functionDecl->getSourceRange();
            }
            return false;
        }
        auto TL = TSI->getTypeLoc().IgnoreParens();
        if (auto ATL = TL.getAs<AttributedTypeLoc>())
        {
            TL = ATL.getModifiedLoc();
        }
        auto const FTL = TL.getAs<FunctionTypeLoc>();
        if (!FTL)
        {
            // Happens when a function declaration uses a typedef for the function type, as in
            //
            //  SAL_JNI_EXPORT javaunohelper::detail::Func_bootstrap
            //  Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap;
            //
            // in javaunohelper/source/juhx-export-functions.hxx.
            //TODO: check the typedef for mention of "SAL_CALL" (and also check for usage of such
            // typedefs in the !startAfterReturnType case below)
            return false;
        }
        startLoc = FTL.getReturnLoc().getEndLoc();
        while (SM.isMacroArgExpansion(startLoc, &startLoc))
        {
        }

        // Stop searching for "SAL_CALL" at the start of the function declaration's name (for
        // qualified names this will point after the qualifiers, but needlessly including those in
        // the search should be harmless---modulo issues with using "SAL_CALL" as the name of a
        // function-like macro parameter as discussed below):
        endLoc = functionDecl->getNameInfo().getBeginLoc();
        while (SM.isMacroArgExpansion(endLoc, &endLoc))
        {
        }
        while (endLoc.isMacroID() && SM.isAtStartOfImmediateMacroExpansion(endLoc, &endLoc))
        {
        }
        endLoc = SM.getSpellingLoc(endLoc);

        auto const slEnd = Lexer::getLocForEndOfToken(startLoc, 0, SM, compiler.getLangOpts());
        if (slEnd.isValid())
        {
            // startLoc is either non-macro, or at end of macro; one source range from startLoc to
            // endLoc:
            startLoc = slEnd;
            while (startLoc.isMacroID() && SM.isAtEndOfImmediateMacroExpansion(startLoc, &startLoc))
            {
            }
            startLoc = SM.getSpellingLoc(startLoc);

            if (startLoc.isValid() && endLoc.isValid() && startLoc != endLoc
                && !SM.isBeforeInTranslationUnit(startLoc, endLoc))
            {
                // Happens for uses of trailing return type (in which case starting instead at the
                // start of the function declaration should be fine), but also for cases like
                //
                //  void (*f())();
                //
                // where the function name is within the function type (TODO: in which case starting
                // at the start can erroneously pick up the "SAL_CALL" from the returned pointer-to-
                // function type in cases like
                //
                //  void SAL_CALL (*f())();
                //
                // that are hopefully rare):
                startAfterReturnType = false;
            }
        }
        else
        {
            // startLoc is within a macro body; two source ranges, first is the remainder of the
            // corresponding macro definition's replacement text, second is from after the macro
            // invocation to endLoc, unless endLoc is already in the first range:
            //TODO: If the macro is a function-like macro with a parameter named "SAL_CALL", uses of
            // that parameter in the remainder of the replacement text will be false positives.
            assert(SM.isMacroBodyExpansion(startLoc));
            auto const startLoc2 = compat::getImmediateExpansionRange(SM, startLoc).second;
            auto name = Lexer::getImmediateMacroName(startLoc, SM, compiler.getLangOpts());
            while (name.startswith("\\\n"))
            {
                name = name.drop_front(2);
                while (!name.empty()
                       && (name.front() == ' ' || name.front() == '\t' || name.front() == '\n'
                           || name.front() == '\v' || name.front() == '\f'))
                {
                    name = name.drop_front(1);
                }
            }
            auto const MI = compiler.getPreprocessor()
                                .getMacroDefinitionAtLoc(&compiler.getASTContext().Idents.get(name),
                                                         SM.getSpellingLoc(startLoc))
                                .getMacroInfo();
            assert(MI != nullptr);
            auto endLoc1 = MI->getDefinitionEndLoc();
            assert(endLoc1.isFileID());
            endLoc1 = Lexer::getLocForEndOfToken(endLoc1, 0, SM, compiler.getLangOpts());
            startLoc = Lexer::getLocForEndOfToken(SM.getSpellingLoc(startLoc), 0, SM,
                                                  compiler.getLangOpts());
            if (!SM.isPointWithin(endLoc, startLoc, endLoc1))
            {
                ranges.emplace_back(startLoc, endLoc1);
                startLoc = Lexer::getLocForEndOfToken(SM.getSpellingLoc(startLoc2), 0, SM,
                                                      compiler.getLangOpts());
            }
        }
    }
    if (!startAfterReturnType)
    {
        // Stop searching for "SAL_CALL" at the start of the function declaration's name (for
        // qualified names this will point after the qualifiers, but needlessly including those in
        // the search should be harmless):
        endLoc = functionDecl->getNameInfo().getBeginLoc();
        while (endLoc.isMacroID() && SM.isAtStartOfImmediateMacroExpansion(endLoc, &endLoc))
        {
        }

        SourceRange macroRange;
        if (SM.isMacroBodyExpansion(endLoc))
        {
            auto name = Lexer::getImmediateMacroName(endLoc, SM, compiler.getLangOpts());
            while (name.startswith("\\\n"))
            {
                name = name.drop_front(2);
                while (!name.empty()
                       && (name.front() == ' ' || name.front() == '\t' || name.front() == '\n'
                           || name.front() == '\v' || name.front() == '\f'))
                {
                    name = name.drop_front(1);
                }
            }
            auto const MI = compiler.getPreprocessor()
                                .getMacroDefinitionAtLoc(&compiler.getASTContext().Idents.get(name),
                                                         SM.getSpellingLoc(endLoc))
                                .getMacroInfo();
            assert(MI != nullptr);
            macroRange = SourceRange(MI->getDefinitionLoc(), MI->getDefinitionEndLoc());
            if (isDebugMode() && macroRange.isInvalid())
            {
                report(DiagnosticsEngine::Fatal, "TODO: unexpected failure #4, needs investigation",
                       functionDecl->getLocation())
                    << functionDecl->getSourceRange();
            }
        }

#if defined _WIN32
        auto const macroExpansion = SM.getExpansionLoc(endLoc);
#endif
        endLoc = SM.getSpellingLoc(endLoc);

        // Ctors/dtors/conversion functions don't have a return type, start searching for "SAL_CALL"
        // at the start of the function declaration:
        startLoc = functionDecl->getSourceRange().getBegin();
        while (startLoc.isMacroID()
               && !(macroRange.isValid()
                    && SM.isPointWithin(SM.getSpellingLoc(startLoc), macroRange.getBegin(),
                                        macroRange.getEnd()))
               && SM.isAtStartOfImmediateMacroExpansion(startLoc, &startLoc))
        {
        }
#if !defined _WIN32
        auto const macroStartLoc = startLoc;
#endif
        startLoc = SM.getSpellingLoc(startLoc);

#if defined _WIN32
        if (macroRange.isValid()
            && !SM.isPointWithin(startLoc, macroRange.getBegin(), macroRange.getEnd()))
        {
            // endLoc is within a macro body but startLoc is not; two source ranges, first is from
            // startLoc to the macro invocation, second is the leading part of the corresponding
            // macro definition's replacement text:
            ranges.emplace_back(startLoc, macroExpansion);
            startLoc = macroRange.getBegin();
        }
#else
        // When the SAL_CALL macro expands to nothing, it may even precede the function
        // declaration's source range, so go back one token (unless the declaration is known to
        // start with a token that must precede a possible "SAL_CALL", like "virtual" or
        // "explicit"):
        //TODO: this will produce false positives if the declaration is immediately preceded by a
        // macro definition whose replacement text ends in "SAL_CALL"
        if (noReturnType
            && !(functionDecl->isVirtualAsWritten()
                 || (isa<CXXConstructorDecl>(functionDecl)
                     && cast<CXXConstructorDecl>(functionDecl)->getExplicitSpecifier().isExplicit())
                 || (isa<CXXConversionDecl>(functionDecl)
                     && cast<CXXConversionDecl>(functionDecl)
                            ->getExplicitSpecifier()
                            .isExplicit())))
        {
            SourceLocation endLoc1;
            if (macroStartLoc.isMacroID()
                && SM.isAtStartOfImmediateMacroExpansion(macroStartLoc, &endLoc1))
            {
                // startLoc is at the start of a macro body; two source ranges, first one is looking
                // backwards one token from the call site of the macro:
                auto startLoc1 = endLoc1;
                for (;;)
                {
                    startLoc1 = Lexer::GetBeginningOfToken(startLoc1.getLocWithOffset(-1), SM,
                                                           compiler.getLangOpts());
                    auto const s = StringRef(
                        SM.getCharacterData(startLoc1),
                        Lexer::MeasureTokenLength(startLoc1, SM, compiler.getLangOpts()));
                    // When looking backward at least through a function-like macro replacement like
                    //
                    // | foo\         |
                    // |    barbaz##X    |
                    //
                    // starting at "barbaz" in the second line, the next token reported will start at "\"
                    // in the first line and include the intervening spaces and (part of? looks like an
                    // error in Clang) "barbaz", so just skip any tokens starting with backslash-newline
                    // when looking backwards here, without even trying to look at their content:
                    if (!(s.empty() || s.startswith("/*") || s.startswith("//")
                          || s.startswith("\\\n")))
                    {
                        break;
                    }
                }
                ranges.emplace_back(startLoc1, endLoc1);
            }
            else
            {
                for (;;)
                {
                    startLoc = Lexer::GetBeginningOfToken(startLoc.getLocWithOffset(-1), SM,
                                                          compiler.getLangOpts());
                    auto const s = StringRef(
                        SM.getCharacterData(startLoc),
                        Lexer::MeasureTokenLength(startLoc, SM, compiler.getLangOpts()));
                    // When looking backward at least through a function-like macro replacement like
                    //
                    // | foo\         |
                    // |    barbaz##X    |
                    //
                    // starting at "barbaz" in the second line, the next token reported will start at "\"
                    // in the first line and include the intervening spaces and (part of? looks like an
                    // error in Clang) "barbaz", so just skip any tokens starting with backslash-newline
                    // when looking backwards here, without even trying to look at their content:
                    if (!(s.empty() || s.startswith("/*") || s.startswith("//")
                          || s.startswith("\\\n")))
                    {
                        break;
                    }
                }
            }
        }
#endif
    }
    ranges.emplace_back(startLoc, endLoc);

    for (auto const& range : ranges)
    {
        if (range.isInvalid())
        {
            if (isDebugMode())
            {
                report(DiagnosticsEngine::Fatal, "TODO: unexpected failure #2, needs investigation",
                       functionDecl->getLocation())
                    << functionDecl->getSourceRange();
            }
            return false;
        }
        if (isDebugMode() && range.getBegin() != range.getEnd()
            && !SM.isBeforeInTranslationUnit(range.getBegin(), range.getEnd()))
        {
            report(DiagnosticsEngine::Fatal, "TODO: unexpected failure #3, needs investigation",
                   functionDecl->getLocation())
                << functionDecl->getSourceRange();
        }

        for (auto loc = range.getBegin(); SM.isBeforeInTranslationUnit(loc, range.getEnd());)
        {
            unsigned n = Lexer::MeasureTokenLength(loc, SM, compiler.getLangOpts());
            auto s = StringRef(compiler.getSourceManager().getCharacterData(loc), n);
            while (s.startswith("\\\n"))
            {
                s = s.drop_front(2);
                while (!s.empty()
                       && (s.front() == ' ' || s.front() == '\t' || s.front() == '\n'
                           || s.front() == '\v' || s.front() == '\f'))
                {
                    s = s.drop_front(1);
                }
            }
            if (s == "SAL_CALL")
            {
                if (pLoc)
                    *pLoc = loc;
                return true;
            }
            loc = loc.getLocWithOffset(std::max<unsigned>(n, 1));
        }
    }
    return false;
}

bool SalCall::rewrite(SourceLocation locBegin)
{
    if (!rewriter)
        return false;
    if (!locBegin.isValid())
        return false;

    auto locEnd = locBegin.getLocWithOffset(8);
    if (!locEnd.isValid())
        return false;

    SourceRange range(locBegin, locEnd);

    if (!replaceText(locBegin, 9, ""))
        return false;

    return true;
}

static loplugin::Plugin::Registration<SalCall> reg("salcall", true);
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */