Coverage Report

Created: 2021-01-19 06:58

/Users/buildslave/jenkins/workspace/coverage/llvm-project/clang/lib/Sema/JumpDiagnostics.cpp
Line
Count
Source (jump to first uncovered line)
1
//===--- JumpDiagnostics.cpp - Protected scope jump analysis ------*- C++ -*-=//
2
//
3
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4
// See https://llvm.org/LICENSE.txt for license information.
5
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6
//
7
//===----------------------------------------------------------------------===//
8
//
9
// This file implements the JumpScopeChecker class, which is used to diagnose
10
// jumps that enter a protected scope in an invalid way.
11
//
12
//===----------------------------------------------------------------------===//
13
14
#include "clang/Sema/SemaInternal.h"
15
#include "clang/AST/DeclCXX.h"
16
#include "clang/AST/Expr.h"
17
#include "clang/AST/ExprCXX.h"
18
#include "clang/AST/StmtCXX.h"
19
#include "clang/AST/StmtObjC.h"
20
#include "clang/AST/StmtOpenMP.h"
21
#include "llvm/ADT/BitVector.h"
22
using namespace clang;
23
24
namespace {
25
26
/// JumpScopeChecker - This object is used by Sema to diagnose invalid jumps
27
/// into VLA and other protected scopes.  For example, this rejects:
28
///    goto L;
29
///    int a[n];
30
///  L:
31
///
32
class JumpScopeChecker {
33
  Sema &S;
34
35
  /// Permissive - True when recovering from errors, in which case precautions
36
  /// are taken to handle incomplete scope information.
37
  const bool Permissive;
38
39
  /// GotoScope - This is a record that we use to keep track of all of the
40
  /// scopes that are introduced by VLAs and other things that scope jumps like
41
  /// gotos.  This scope tree has nothing to do with the source scope tree,
42
  /// because you can have multiple VLA scopes per compound statement, and most
43
  /// compound statements don't introduce any scopes.
44
  struct GotoScope {
45
    /// ParentScope - The index in ScopeMap of the parent scope.  This is 0 for
46
    /// the parent scope is the function body.
47
    unsigned ParentScope;
48
49
    /// InDiag - The note to emit if there is a jump into this scope.
50
    unsigned InDiag;
51
52
    /// OutDiag - The note to emit if there is an indirect jump out
53
    /// of this scope.  Direct jumps always clean up their current scope
54
    /// in an orderly way.
55
    unsigned OutDiag;
56
57
    /// Loc - Location to emit the diagnostic.
58
    SourceLocation Loc;
59
60
    GotoScope(unsigned parentScope, unsigned InDiag, unsigned OutDiag,
61
              SourceLocation L)
62
40.2k
      : ParentScope(parentScope), InDiag(InDiag), OutDiag(OutDiag), Loc(L) {}
63
  };
64
65
  SmallVector<GotoScope, 48> Scopes;
66
  llvm::DenseMap<Stmt*, unsigned> LabelAndGotoScopes;
67
  SmallVector<Stmt*, 16> Jumps;
68
69
  SmallVector<Stmt*, 4> IndirectJumps;
70
  SmallVector<Stmt*, 4> AsmJumps;
71
  SmallVector<LabelDecl*, 4> IndirectJumpTargets;
72
  SmallVector<LabelDecl*, 4> AsmJumpTargets;
73
public:
74
  JumpScopeChecker(Stmt *Body, Sema &S);
75
private:
76
  void BuildScopeInformation(Decl *D, unsigned &ParentScope);
77
  void BuildScopeInformation(VarDecl *D, const BlockDecl *BDecl,
78
                             unsigned &ParentScope);
79
  void BuildScopeInformation(CompoundLiteralExpr *CLE, unsigned &ParentScope);
80
  void BuildScopeInformation(Stmt *S, unsigned &origParentScope);
81
82
  void VerifyJumps();
83
  void VerifyIndirectOrAsmJumps(bool IsAsmGoto);
84
  void NoteJumpIntoScopes(ArrayRef<unsigned> ToScopes);
85
  void DiagnoseIndirectOrAsmJump(Stmt *IG, unsigned IGScope, LabelDecl *Target,
86
                                 unsigned TargetScope);
87
  void CheckJump(Stmt *From, Stmt *To, SourceLocation DiagLoc,
88
                 unsigned JumpDiag, unsigned JumpDiagWarning,
89
                 unsigned JumpDiagCXX98Compat);
90
  void CheckGotoStmt(GotoStmt *GS);
91
92
  unsigned GetDeepestCommonScope(unsigned A, unsigned B);
93
};
94
} // end anonymous namespace
95
96
64.6k
#define CHECK_PERMISSIVE(x) (assert(Permissive || !(x)), (Permissive && 
(x)1.20k
))
97
98
JumpScopeChecker::JumpScopeChecker(Stmt *Body, Sema &s)
99
5.63k
    : S(s), Permissive(s.hasAnyUnrecoverableErrorsInThisFunction()) {
100
  // Add a scope entry for function scope.
101
5.63k
  Scopes.push_back(GotoScope(~0U, ~0U, ~0U, SourceLocation()));
102
103
  // Build information for the top level compound statement, so that we have a
104
  // defined scope record for every "goto" and label.
105
5.63k
  unsigned BodyParentScope = 0;
106
5.63k
  BuildScopeInformation(Body, BodyParentScope);
107
108
  // Check that all jumps we saw are kosher.
109
5.63k
  VerifyJumps();
110
5.63k
  VerifyIndirectOrAsmJumps(false);
111
5.63k
  VerifyIndirectOrAsmJumps(true);
112
5.63k
}
113
114
/// GetDeepestCommonScope - Finds the innermost scope enclosing the
115
/// two scopes.
116
1.53k
unsigned JumpScopeChecker::GetDeepestCommonScope(unsigned A, unsigned B) {
117
6.79k
  while (A != B) {
118
    // Inner scopes are created after outer scopes and therefore have
119
    // higher indices.
120
5.26k
    if (A < B) {
121
252
      assert(Scopes[B].ParentScope < B);
122
252
      B = Scopes[B].ParentScope;
123
5.01k
    } else {
124
5.01k
      assert(Scopes[A].ParentScope < A);
125
5.01k
      A = Scopes[A].ParentScope;
126
5.01k
    }
127
5.26k
  }
128
1.53k
  return A;
129
1.53k
}
130
131
typedef std::pair<unsigned,unsigned> ScopePair;
132
133
/// GetDiagForGotoScopeDecl - If this decl induces a new goto scope, return a
134
/// diagnostic that should be emitted if control goes over it. If not, return 0.
135
40.7k
static ScopePair GetDiagForGotoScopeDecl(Sema &S, const Decl *D) {
136
40.7k
  if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
137
36.1k
    unsigned InDiag = 0;
138
36.1k
    unsigned OutDiag = 0;
139
140
36.1k
    if (VD->getType()->isVariablyModifiedType())
141
35
      InDiag = diag::note_protected_by_vla;
142
143
36.1k
    if (VD->hasAttr<BlocksAttr>())
144
2
      return ScopePair(diag::note_protected_by___block,
145
2
                       diag::note_exits___block);
146
147
36.1k
    if (VD->hasAttr<CleanupAttr>())
148
1
      return ScopePair(diag::note_protected_by_cleanup,
149
1
                       diag::note_exits_cleanup);
150
151
36.1k
    if (VD->hasLocalStorage()) {
152
35.6k
      switch (VD->getType().isDestructedType()) {
153
22
      case QualType::DK_objc_strong_lifetime:
154
22
        return ScopePair(diag::note_protected_by_objc_strong_init,
155
22
                         diag::note_exits_objc_strong);
156
157
5
      case QualType::DK_objc_weak_lifetime:
158
5
        return ScopePair(diag::note_protected_by_objc_weak_init,
159
5
                         diag::note_exits_objc_weak);
160
161
4
      case QualType::DK_nontrivial_c_struct:
162
4
        return ScopePair(diag::note_protected_by_non_trivial_c_struct_init,
163
4
                         diag::note_exits_dtor);
164
165
556
      case QualType::DK_cxx_destructor:
166
556
        OutDiag = diag::note_exits_dtor;
167
556
        break;
168
169
35.1k
      case QualType::DK_none:
170
35.1k
        break;
171
36.1k
      }
172
36.1k
    }
173
174
36.1k
    const Expr *Init = VD->getInit();
175
36.1k
    if (S.Context.getLangOpts().CPlusPlus && 
VD->hasLocalStorage()35.8k
&&
Init35.3k
) {
176
      // C++11 [stmt.dcl]p3:
177
      //   A program that jumps from a point where a variable with automatic
178
      //   storage duration is not in scope to a point where it is in scope
179
      //   is ill-formed unless the variable has scalar type, class type with
180
      //   a trivial default constructor and a trivial destructor, a
181
      //   cv-qualified version of one of these types, or an array of one of
182
      //   the preceding types and is declared without an initializer.
183
184
      // C++03 [stmt.dcl.p3:
185
      //   A program that jumps from a point where a local variable
186
      //   with automatic storage duration is not in scope to a point
187
      //   where it is in scope is ill-formed unless the variable has
188
      //   POD type and is declared without an initializer.
189
190
32.4k
      InDiag = diag::note_protected_by_variable_init;
191
192
      // For a variable of (array of) class type declared without an
193
      // initializer, we will have call-style initialization and the initializer
194
      // will be the CXXConstructExpr with no intervening nodes.
195
32.4k
      if (const CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init)) {
196
2.39k
        const CXXConstructorDecl *Ctor = CCE->getConstructor();
197
2.39k
        if (Ctor->isTrivial() && 
Ctor->isDefaultConstructor()363
&&
198
246
            VD->getInitStyle() == VarDecl::CallInit) {
199
235
          if (OutDiag)
200
79
            InDiag = diag::note_protected_by_variable_nontriv_destructor;
201
156
          else if (!Ctor->getParent()->isPOD())
202
21
            InDiag = diag::note_protected_by_variable_non_pod;
203
135
          else
204
135
            InDiag = 0;
205
235
        }
206
2.39k
      }
207
32.4k
    }
208
209
36.1k
    return ScopePair(InDiag, OutDiag);
210
36.1k
  }
211
212
4.66k
  if (const TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
213
4.24k
    if (TD->getUnderlyingType()->isVariablyModifiedType())
214
4
      return ScopePair(isa<TypedefDecl>(TD)
215
3
                           ? diag::note_protected_by_vla_typedef
216
1
                           : diag::note_protected_by_vla_type_alias,
217
4
                       0);
218
4.66k
  }
219
220
4.66k
  return ScopePair(0U, 0U);
221
4.66k
}
222
223
/// Build scope information for a declaration that is part of a DeclStmt.
224
40.7k
void JumpScopeChecker::BuildScopeInformation(Decl *D, unsigned &ParentScope) {
225
  // If this decl causes a new scope, push and switch to it.
226
40.7k
  std::pair<unsigned,unsigned> Diags = GetDiagForGotoScopeDecl(S, D);
227
40.7k
  if (Diags.first || 
Diags.second8.43k
) {
228
32.3k
    Scopes.push_back(GotoScope(ParentScope, Diags.first, Diags.second,
229
32.3k
                               D->getLocation()));
230
32.3k
    ParentScope = Scopes.size()-1;
231
32.3k
  }
232
233
  // If the decl has an initializer, walk it with the potentially new
234
  // scope we just installed.
235
40.7k
  if (VarDecl *VD = dyn_cast<VarDecl>(D))
236
36.1k
    if (Expr *Init = VD->getInit())
237
33.0k
      BuildScopeInformation(Init, ParentScope);
238
40.7k
}
239
240
/// Build scope information for a captured block literal variables.
241
void JumpScopeChecker::BuildScopeInformation(VarDecl *D,
242
                                             const BlockDecl *BDecl,
243
109
                                             unsigned &ParentScope) {
244
  // exclude captured __block variables; there's no destructor
245
  // associated with the block literal for them.
246
109
  if (D->hasAttr<BlocksAttr>())
247
2
    return;
248
107
  QualType T = D->getType();
249
107
  QualType::DestructionKind destructKind = T.isDestructedType();
250
107
  if (destructKind != QualType::DK_none) {
251
17
    std::pair<unsigned,unsigned> Diags;
252
17
    switch (destructKind) {
253
1
      case QualType::DK_cxx_destructor:
254
1
        Diags = ScopePair(diag::note_enters_block_captures_cxx_obj,
255
1
                          diag::note_exits_block_captures_cxx_obj);
256
1
        break;
257
14
      case QualType::DK_objc_strong_lifetime:
258
14
        Diags = ScopePair(diag::note_enters_block_captures_strong,
259
14
                          diag::note_exits_block_captures_strong);
260
14
        break;
261
0
      case QualType::DK_objc_weak_lifetime:
262
0
        Diags = ScopePair(diag::note_enters_block_captures_weak,
263
0
                          diag::note_exits_block_captures_weak);
264
0
        break;
265
2
      case QualType::DK_nontrivial_c_struct:
266
2
        Diags = ScopePair(diag::note_enters_block_captures_non_trivial_c_struct,
267
2
                          diag::note_exits_block_captures_non_trivial_c_struct);
268
2
        break;
269
0
      case QualType::DK_none:
270
0
        llvm_unreachable("non-lifetime captured variable");
271
17
    }
272
17
    SourceLocation Loc = D->getLocation();
273
17
    if (Loc.isInvalid())
274
9
      Loc = BDecl->getLocation();
275
17
    Scopes.push_back(GotoScope(ParentScope,
276
17
                               Diags.first, Diags.second, Loc));
277
17
    ParentScope = Scopes.size()-1;
278
17
  }
279
107
}
280
281
/// Build scope information for compound literals of C struct types that are
282
/// non-trivial to destruct.
283
void JumpScopeChecker::BuildScopeInformation(CompoundLiteralExpr *CLE,
284
2
                                             unsigned &ParentScope) {
285
2
  unsigned InDiag = diag::note_enters_compound_literal_scope;
286
2
  unsigned OutDiag = diag::note_exits_compound_literal_scope;
287
2
  Scopes.push_back(GotoScope(ParentScope, InDiag, OutDiag, CLE->getExprLoc()));
288
2
  ParentScope = Scopes.size() - 1;
289
2
}
290
291
/// BuildScopeInformation - The statements from CI to CE are known to form a
292
/// coherent VLA scope with a specified parent node.  Walk through the
293
/// statements, adding any labels or gotos to LabelAndGotoScopes and recursively
294
/// walking the AST as needed.
295
void JumpScopeChecker::BuildScopeInformation(Stmt *S,
296
1.12M
                                             unsigned &origParentScope) {
297
  // If this is a statement, rather than an expression, scopes within it don't
298
  // propagate out into the enclosing scope.  Otherwise we have to worry
299
  // about block literals, which have the lifetime of their enclosing statement.
300
1.12M
  unsigned independentParentScope = origParentScope;
301
1.12M
  unsigned &ParentScope = ((isa<Expr>(S) && 
!isa<StmtExpr>(S)939k
)
302
938k
                            ? origParentScope : 
independentParentScope191k
);
303
304
1.12M
  unsigned StmtsToSkip = 0u;
305
306
  // If we found a label, remember that it is in ParentScope scope.
307
1.12M
  switch (S->getStmtClass()) {
308
187
  case Stmt::AddrLabelExprClass:
309
187
    IndirectJumpTargets.push_back(cast<AddrLabelExpr>(S)->getLabel());
310
187
    break;
311
312
4
  case Stmt::ObjCForCollectionStmtClass: {
313
4
    auto *CS = cast<ObjCForCollectionStmt>(S);
314
4
    unsigned Diag = diag::note_protected_by_objc_fast_enumeration;
315
4
    unsigned NewParentScope = Scopes.size();
316
4
    Scopes.push_back(GotoScope(ParentScope, Diag, 0, S->getBeginLoc()));
317
4
    BuildScopeInformation(CS->getBody(), NewParentScope);
318
4
    return;
319
0
  }
320
321
127
  case Stmt::IndirectGotoStmtClass:
322
    // "goto *&&lbl;" is a special case which we treat as equivalent
323
    // to a normal goto.  In addition, we don't calculate scope in the
324
    // operand (to avoid recording the address-of-label use), which
325
    // works only because of the restricted set of expressions which
326
    // we detect as constant targets.
327
127
    if (cast<IndirectGotoStmt>(S)->getConstantTarget()) {
328
7
      LabelAndGotoScopes[S] = ParentScope;
329
7
      Jumps.push_back(S);
330
7
      return;
331
7
    }
332
333
120
    LabelAndGotoScopes[S] = ParentScope;
334
120
    IndirectJumps.push_back(S);
335
120
    break;
336
337
4.45k
  case Stmt::SwitchStmtClass:
338
    // Evaluate the C++17 init stmt and condition variable
339
    // before entering the scope of the switch statement.
340
4.45k
    if (Stmt *Init = cast<SwitchStmt>(S)->getInit()) {
341
65
      BuildScopeInformation(Init, ParentScope);
342
65
      ++StmtsToSkip;
343
65
    }
344
4.45k
    if (VarDecl *Var = cast<SwitchStmt>(S)->getConditionVariable()) {
345
53
      BuildScopeInformation(Var, ParentScope);
346
53
      ++StmtsToSkip;
347
53
    }
348
4.45k
    LLVM_FALLTHROUGH;
349
350
8.34k
  case Stmt::GotoStmtClass:
351
    // Remember both what scope a goto is in as well as the fact that we have
352
    // it.  This makes the second scan not have to walk the AST again.
353
8.34k
    LabelAndGotoScopes[S] = ParentScope;
354
8.34k
    Jumps.push_back(S);
355
8.34k
    break;
356
357
28
  case Stmt::GCCAsmStmtClass:
358
28
    if (auto *GS = dyn_cast<GCCAsmStmt>(S))
359
28
      if (GS->isAsmGoto()) {
360
        // Remember both what scope a goto is in as well as the fact that we
361
        // have it.  This makes the second scan not have to walk the AST again.
362
17
        LabelAndGotoScopes[S] = ParentScope;
363
17
        AsmJumps.push_back(GS);
364
17
        for (auto *E : GS->labels())
365
19
          AsmJumpTargets.push_back(E->getLabel());
366
17
      }
367
28
    break;
368
369
36.5k
  case Stmt::IfStmtClass: {
370
36.5k
    IfStmt *IS = cast<IfStmt>(S);
371
36.5k
    if (!(IS->isConstexpr() || 
IS->isObjCAvailabilityCheck()36.5k
))
372
36.5k
      break;
373
374
16
    unsigned Diag = IS->isConstexpr() ? 
diag::note_protected_by_constexpr_if14
375
2
                                      : diag::note_protected_by_if_available;
376
377
16
    if (VarDecl *Var = IS->getConditionVariable())
378
0
      BuildScopeInformation(Var, ParentScope);
379
380
    // Cannot jump into the middle of the condition.
381
16
    unsigned NewParentScope = Scopes.size();
382
16
    Scopes.push_back(GotoScope(ParentScope, Diag, 0, IS->getBeginLoc()));
383
16
    BuildScopeInformation(IS->getCond(), NewParentScope);
384
385
    // Jumps into either arm of an 'if constexpr' are not allowed.
386
16
    NewParentScope = Scopes.size();
387
16
    Scopes.push_back(GotoScope(ParentScope, Diag, 0, IS->getBeginLoc()));
388
16
    BuildScopeInformation(IS->getThen(), NewParentScope);
389
16
    if (Stmt *Else = IS->getElse()) {
390
9
      NewParentScope = Scopes.size();
391
9
      Scopes.push_back(GotoScope(ParentScope, Diag, 0, IS->getBeginLoc()));
392
9
      BuildScopeInformation(Else, NewParentScope);
393
9
    }
394
16
    return;
395
16
  }
396
397
125
  case Stmt::CXXTryStmtClass: {
398
125
    CXXTryStmt *TS = cast<CXXTryStmt>(S);
399
125
    {
400
125
      unsigned NewParentScope = Scopes.size();
401
125
      Scopes.push_back(GotoScope(ParentScope,
402
125
                                 diag::note_protected_by_cxx_try,
403
125
                                 diag::note_exits_cxx_try,
404
125
                                 TS->getSourceRange().getBegin()));
405
125
      if (Stmt *TryBlock = TS->getTryBlock())
406
125
        BuildScopeInformation(TryBlock, NewParentScope);
407
125
    }
408
409
    // Jump from the catch into the try is not allowed either.
410
254
    for (unsigned I = 0, E = TS->getNumHandlers(); I != E; 
++I129
) {
411
129
      CXXCatchStmt *CS = TS->getHandler(I);
412
129
      unsigned NewParentScope = Scopes.size();
413
129
      Scopes.push_back(GotoScope(ParentScope,
414
129
                                 diag::note_protected_by_cxx_catch,
415
129
                                 diag::note_exits_cxx_catch,
416
129
                                 CS->getSourceRange().getBegin()));
417
129
      BuildScopeInformation(CS->getHandlerBlock(), NewParentScope);
418
129
    }
419
125
    return;
420
16
  }
421
422
78
  case Stmt::SEHTryStmtClass: {
423
78
    SEHTryStmt *TS = cast<SEHTryStmt>(S);
424
78
    {
425
78
      unsigned NewParentScope = Scopes.size();
426
78
      Scopes.push_back(GotoScope(ParentScope,
427
78
                                 diag::note_protected_by_seh_try,
428
78
                                 diag::note_exits_seh_try,
429
78
                                 TS->getSourceRange().getBegin()));
430
78
      if (Stmt *TryBlock = TS->getTryBlock())
431
78
        BuildScopeInformation(TryBlock, NewParentScope);
432
78
    }
433
434
    // Jump from __except or __finally into the __try are not allowed either.
435
78
    if (SEHExceptStmt *Except = TS->getExceptHandler()) {
436
24
      unsigned NewParentScope = Scopes.size();
437
24
      Scopes.push_back(GotoScope(ParentScope,
438
24
                                 diag::note_protected_by_seh_except,
439
24
                                 diag::note_exits_seh_except,
440
24
                                 Except->getSourceRange().getBegin()));
441
24
      BuildScopeInformation(Except->getBlock(), NewParentScope);
442
54
    } else if (SEHFinallyStmt *Finally = TS->getFinallyHandler()) {
443
54
      unsigned NewParentScope = Scopes.size();
444
54
      Scopes.push_back(GotoScope(ParentScope,
445
54
                                 diag::note_protected_by_seh_finally,
446
54
                                 diag::note_exits_seh_finally,
447
54
                                 Finally->getSourceRange().getBegin()));
448
54
      BuildScopeInformation(Finally->getBlock(), NewParentScope);
449
54
    }
450
451
78
    return;
452
16
  }
453
454
40.5k
  case Stmt::DeclStmtClass: {
455
    // If this is a declstmt with a VLA definition, it defines a scope from here
456
    // to the end of the containing context.
457
40.5k
    DeclStmt *DS = cast<DeclStmt>(S);
458
    // The decl statement creates a scope if any of the decls in it are VLAs
459
    // or have the cleanup attribute.
460
40.5k
    for (auto *I : DS->decls())
461
40.7k
      BuildScopeInformation(I, origParentScope);
462
40.5k
    return;
463
16
  }
464
465
7
  case Stmt::ObjCAtTryStmtClass: {
466
    // Disallow jumps into any part of an @try statement by pushing a scope and
467
    // walking all sub-stmts in that scope.
468
7
    ObjCAtTryStmt *AT = cast<ObjCAtTryStmt>(S);
469
    // Recursively walk the AST for the @try part.
470
7
    {
471
7
      unsigned NewParentScope = Scopes.size();
472
7
      Scopes.push_back(GotoScope(ParentScope,
473
7
                                 diag::note_protected_by_objc_try,
474
7
                                 diag::note_exits_objc_try,
475
7
                                 AT->getAtTryLoc()));
476
7
      if (Stmt *TryPart = AT->getTryBody())
477
7
        BuildScopeInformation(TryPart, NewParentScope);
478
7
    }
479
480
    // Jump from the catch to the finally or try is not valid.
481
18
    for (unsigned I = 0, N = AT->getNumCatchStmts(); I != N; 
++I11
) {
482
11
      ObjCAtCatchStmt *AC = AT->getCatchStmt(I);
483
11
      unsigned NewParentScope = Scopes.size();
484
11
      Scopes.push_back(GotoScope(ParentScope,
485
11
                                 diag::note_protected_by_objc_catch,
486
11
                                 diag::note_exits_objc_catch,
487
11
                                 AC->getAtCatchLoc()));
488
      // @catches are nested and it isn't
489
11
      BuildScopeInformation(AC->getCatchBody(), NewParentScope);
490
11
    }
491
492
    // Jump from the finally to the try or catch is not valid.
493
7
    if (ObjCAtFinallyStmt *AF = AT->getFinallyStmt()) {
494
4
      unsigned NewParentScope = Scopes.size();
495
4
      Scopes.push_back(GotoScope(ParentScope,
496
4
                                 diag::note_protected_by_objc_finally,
497
4
                                 diag::note_exits_objc_finally,
498
4
                                 AF->getAtFinallyLoc()));
499
4
      BuildScopeInformation(AF, NewParentScope);
500
4
    }
501
502
7
    return;
503
16
  }
504
505
1
  case Stmt::ObjCAtSynchronizedStmtClass: {
506
    // Disallow jumps into the protected statement of an @synchronized, but
507
    // allow jumps into the object expression it protects.
508
1
    ObjCAtSynchronizedStmt *AS = cast<ObjCAtSynchronizedStmt>(S);
509
    // Recursively walk the AST for the @synchronized object expr, it is
510
    // evaluated in the normal scope.
511
1
    BuildScopeInformation(AS->getSynchExpr(), ParentScope);
512
513
    // Recursively walk the AST for the @synchronized part, protected by a new
514
    // scope.
515
1
    unsigned NewParentScope = Scopes.size();
516
1
    Scopes.push_back(GotoScope(ParentScope,
517
1
                               diag::note_protected_by_objc_synchronized,
518
1
                               diag::note_exits_objc_synchronized,
519
1
                               AS->getAtSynchronizedLoc()));
520
1
    BuildScopeInformation(AS->getSynchBody(), NewParentScope);
521
1
    return;
522
16
  }
523
524
2
  case Stmt::ObjCAutoreleasePoolStmtClass: {
525
    // Disallow jumps into the protected statement of an @autoreleasepool.
526
2
    ObjCAutoreleasePoolStmt *AS = cast<ObjCAutoreleasePoolStmt>(S);
527
    // Recursively walk the AST for the @autoreleasepool part, protected by a
528
    // new scope.
529
2
    unsigned NewParentScope = Scopes.size();
530
2
    Scopes.push_back(GotoScope(ParentScope,
531
2
                               diag::note_protected_by_objc_autoreleasepool,
532
2
                               diag::note_exits_objc_autoreleasepool,
533
2
                               AS->getAtLoc()));
534
2
    BuildScopeInformation(AS->getSubStmt(), NewParentScope);
535
2
    return;
536
16
  }
537
538
1.83k
  case Stmt::ExprWithCleanupsClass: {
539
    // Disallow jumps past full-expressions that use blocks with
540
    // non-trivial cleanups of their captures.  This is theoretically
541
    // implementable but a lot of work which we haven't felt up to doing.
542
1.83k
    ExprWithCleanups *EWC = cast<ExprWithCleanups>(S);
543
1.94k
    for (unsigned i = 0, e = EWC->getNumObjects(); i != e; 
++i111
) {
544
111
      if (auto *BDecl = EWC->getObject(i).dyn_cast<BlockDecl *>())
545
109
        for (const auto &CI : BDecl->captures()) {
546
109
          VarDecl *variable = CI.getVariable();
547
109
          BuildScopeInformation(variable, BDecl, origParentScope);
548
109
        }
549
2
      else if (auto *CLE = EWC->getObject(i).dyn_cast<CompoundLiteralExpr *>())
550
2
        BuildScopeInformation(CLE, origParentScope);
551
2
      else
552
0
        llvm_unreachable("unexpected cleanup object type");
553
111
    }
554
1.83k
    break;
555
1.83k
  }
556
557
1.09k
  case Stmt::MaterializeTemporaryExprClass: {
558
    // Disallow jumps out of scopes containing temporaries lifetime-extended to
559
    // automatic storage duration.
560
1.09k
    MaterializeTemporaryExpr *MTE = cast<MaterializeTemporaryExpr>(S);
561
1.09k
    if (MTE->getStorageDuration() == SD_Automatic) {
562
96
      SmallVector<const Expr *, 4> CommaLHS;
563
96
      SmallVector<SubobjectAdjustment, 4> Adjustments;
564
96
      const Expr *ExtendedObject =
565
96
          MTE->getSubExpr()->skipRValueSubobjectAdjustments(CommaLHS,
566
96
                                                            Adjustments);
567
96
      if (ExtendedObject->getType().isDestructedType()) {
568
11
        Scopes.push_back(GotoScope(ParentScope, 0,
569
11
                                   diag::note_exits_temporary_dtor,
570
11
                                   ExtendedObject->getExprLoc()));
571
11
        origParentScope = Scopes.size()-1;
572
11
      }
573
96
    }
574
1.09k
    break;
575
1.83k
  }
576
577
2
  case Stmt::CaseStmtClass:
578
4
  case Stmt::DefaultStmtClass:
579
76
  case Stmt::LabelStmtClass:
580
76
    LabelAndGotoScopes[S] = ParentScope;
581
76
    break;
582
583
1.04M
  default:
584
1.04M
    if (auto *ED = dyn_cast<OMPExecutableDirective>(S)) {
585
2.29k
      if (!ED->isStandaloneDirective()) {
586
1.76k
        unsigned NewParentScope = Scopes.size();
587
1.76k
        Scopes.emplace_back(ParentScope,
588
1.76k
                            diag::note_omp_protected_structured_block,
589
1.76k
                            diag::note_omp_exits_structured_block,
590
1.76k
                            ED->getStructuredBlock()->getBeginLoc());
591
1.76k
        BuildScopeInformation(ED->getStructuredBlock(), NewParentScope);
592
1.76k
        return;
593
1.76k
      }
594
1.03M
    }
595
1.03M
    break;
596
1.08M
  }
597
598
1.09M
  
for (Stmt *SubStmt : S->children())1.08M
{
599
1.09M
    if (!SubStmt)
600
3.76k
        continue;
601
1.08M
    if (StmtsToSkip) {
602
118
      --StmtsToSkip;
603
118
      continue;
604
118
    }
605
606
    // Cases, labels, and defaults aren't "scope parents".  It's also
607
    // important to handle these iteratively instead of recursively in
608
    // order to avoid blowing out the stack.
609
1.11M
    
while (1.08M
true) {
610
1.11M
      Stmt *Next;
611
1.11M
      if (SwitchCase *SC = dyn_cast<SwitchCase>(SubStmt))
612
18.9k
        Next = SC->getSubStmt();
613
1.09M
      else if (LabelStmt *LS = dyn_cast<LabelStmt>(SubStmt))
614
3.37k
        Next = LS->getSubStmt();
615
1.08M
      else
616
1.08M
        break;
617
618
22.3k
      LabelAndGotoScopes[SubStmt] = ParentScope;
619
22.3k
      SubStmt = Next;
620
22.3k
    }
621
622
    // Recursively walk the AST.
623
1.08M
    BuildScopeInformation(SubStmt, ParentScope);
624
1.08M
  }
625
1.08M
}
626
627
/// VerifyJumps - Verify each element of the Jumps array to see if they are
628
/// valid, emitting diagnostics if not.
629
5.63k
void JumpScopeChecker::VerifyJumps() {
630
13.9k
  while (!Jumps.empty()) {
631
8.34k
    Stmt *Jump = Jumps.pop_back_val();
632
633
    // With a goto,
634
8.34k
    if (GotoStmt *GS = dyn_cast<GotoStmt>(Jump)) {
635
      // The label may not have a statement if it's coming from inline MS ASM.
636
3.88k
      if (GS->getLabel()->getStmt()) {
637
3.57k
        CheckJump(GS, GS->getLabel()->getStmt(), GS->getGotoLoc(),
638
3.57k
                  diag::err_goto_into_protected_scope,
639
3.57k
                  diag::ext_goto_into_protected_scope,
640
3.57k
                  diag::warn_cxx98_compat_goto_into_protected_scope);
641
3.57k
      }
642
3.88k
      CheckGotoStmt(GS);
643
3.88k
      continue;
644
3.88k
    }
645
646
    // We only get indirect gotos here when they have a constant target.
647
4.46k
    if (IndirectGotoStmt *IGS = dyn_cast<IndirectGotoStmt>(Jump)) {
648
7
      LabelDecl *Target = IGS->getConstantTarget();
649
7
      CheckJump(IGS, Target->getStmt(), IGS->getGotoLoc(),
650
7
                diag::err_goto_into_protected_scope,
651
7
                diag::ext_goto_into_protected_scope,
652
7
                diag::warn_cxx98_compat_goto_into_protected_scope);
653
7
      continue;
654
7
    }
655
656
4.45k
    SwitchStmt *SS = cast<SwitchStmt>(Jump);
657
23.4k
    for (SwitchCase *SC = SS->getSwitchCaseList(); SC;
658
18.9k
         SC = SC->getNextSwitchCase()) {
659
18.9k
      if (CHECK_PERMISSIVE(!LabelAndGotoScopes.count(SC)))
660
0
        continue;
661
18.9k
      SourceLocation Loc;
662
18.9k
      if (CaseStmt *CS = dyn_cast<CaseStmt>(SC))
663
17.8k
        Loc = CS->getBeginLoc();
664
1.14k
      else if (DefaultStmt *DS = dyn_cast<DefaultStmt>(SC))
665
1.14k
        Loc = DS->getBeginLoc();
666
0
      else
667
0
        Loc = SC->getBeginLoc();
668
18.9k
      CheckJump(SS, SC, Loc, diag::err_switch_into_protected_scope, 0,
669
18.9k
                diag::warn_cxx98_compat_switch_into_protected_scope);
670
18.9k
    }
671
4.45k
  }
672
5.63k
}
673
674
/// VerifyIndirectOrAsmJumps - Verify whether any possible indirect goto or
675
/// asm goto jump might cross a protection boundary.  Unlike direct jumps,
676
/// indirect or asm goto jumps count cleanups as protection boundaries:
677
/// since there's no way to know where the jump is going, we can't implicitly
678
/// run the right cleanups the way we can with direct jumps.
679
/// Thus, an indirect/asm jump is "trivial" if it bypasses no
680
/// initializations and no teardowns.  More formally, an indirect/asm jump
681
/// from A to B is trivial if the path out from A to DCA(A,B) is
682
/// trivial and the path in from DCA(A,B) to B is trivial, where
683
/// DCA(A,B) is the deepest common ancestor of A and B.
684
/// Jump-triviality is transitive but asymmetric.
685
///
686
/// A path in is trivial if none of the entered scopes have an InDiag.
687
/// A path out is trivial is none of the exited scopes have an OutDiag.
688
///
689
/// Under these definitions, this function checks that the indirect
690
/// jump between A and B is trivial for every indirect goto statement A
691
/// and every label B whose address was taken in the function.
692
11.2k
void JumpScopeChecker::VerifyIndirectOrAsmJumps(bool IsAsmGoto) {
693
5.63k
  SmallVector<Stmt*, 4> GotoJumps = IsAsmGoto ? AsmJumps : IndirectJumps;
694
11.2k
  if (GotoJumps.empty())
695
11.1k
    return;
696
115
  SmallVector<LabelDecl *, 4> JumpTargets =
697
98
      IsAsmGoto ? 
AsmJumpTargets17
: IndirectJumpTargets;
698
  // If there aren't any address-of-label expressions in this function,
699
  // complain about the first indirect goto.
700
115
  if (JumpTargets.empty()) {
701
0
    assert(!IsAsmGoto &&"only indirect goto can get here");
702
0
    S.Diag(GotoJumps[0]->getBeginLoc(),
703
0
           diag::err_indirect_goto_without_addrlabel);
704
0
    return;
705
0
  }
706
  // Collect a single representative of every scope containing an
707
  // indirect or asm goto.  For most code bases, this substantially cuts
708
  // down on the number of jump sites we'll have to consider later.
709
115
  typedef std::pair<unsigned, Stmt*> JumpScope;
710
115
  SmallVector<JumpScope, 32> JumpScopes;
711
115
  {
712
115
    llvm::DenseMap<unsigned, Stmt*> JumpScopesMap;
713
115
    for (SmallVectorImpl<Stmt *>::iterator I = GotoJumps.begin(),
714
115
                                           E = GotoJumps.end();
715
252
         I != E; 
++I137
) {
716
137
      Stmt *IG = *I;
717
137
      if (CHECK_PERMISSIVE(!LabelAndGotoScopes.count(IG)))
718
0
        continue;
719
137
      unsigned IGScope = LabelAndGotoScopes[IG];
720
137
      Stmt *&Entry = JumpScopesMap[IGScope];
721
137
      if (!Entry) 
Entry = IG126
;
722
137
    }
723
115
    JumpScopes.reserve(JumpScopesMap.size());
724
115
    for (llvm::DenseMap<unsigned, Stmt *>::iterator I = JumpScopesMap.begin(),
725
115
                                                    E = JumpScopesMap.end();
726
241
         I != E; 
++I126
)
727
126
      JumpScopes.push_back(*I);
728
115
  }
729
730
  // Collect a single representative of every scope containing a
731
  // label whose address was taken somewhere in the function.
732
  // For most code bases, there will be only one such scope.
733
115
  llvm::DenseMap<unsigned, LabelDecl*> TargetScopes;
734
115
  for (SmallVectorImpl<LabelDecl *>::iterator I = JumpTargets.begin(),
735
115
                                              E = JumpTargets.end();
736
311
       I != E; 
++I196
) {
737
196
    LabelDecl *TheLabel = *I;
738
196
    if (CHECK_PERMISSIVE(!LabelAndGotoScopes.count(TheLabel->getStmt())))
739
0
      continue;
740
196
    unsigned LabelScope = LabelAndGotoScopes[TheLabel->getStmt()];
741
196
    LabelDecl *&Target = TargetScopes[LabelScope];
742
196
    if (!Target) 
Target = TheLabel122
;
743
196
  }
744
745
  // For each target scope, make sure it's trivially reachable from
746
  // every scope containing a jump site.
747
  //
748
  // A path between scopes always consists of exitting zero or more
749
  // scopes, then entering zero or more scopes.  We build a set of
750
  // of scopes S from which the target scope can be trivially
751
  // entered, then verify that every jump scope can be trivially
752
  // exitted to reach a scope in S.
753
115
  llvm::BitVector Reachable(Scopes.size(), false);
754
115
  for (llvm::DenseMap<unsigned,LabelDecl*>::iterator
755
237
         TI = TargetScopes.begin(), TE = TargetScopes.end(); TI != TE; 
++TI122
) {
756
122
    unsigned TargetScope = TI->first;
757
122
    LabelDecl *TargetLabel = TI->second;
758
759
122
    Reachable.reset();
760
761
    // Mark all the enclosing scopes from which you can safely jump
762
    // into the target scope.  'Min' will end up being the index of
763
    // the shallowest such scope.
764
122
    unsigned Min = TargetScope;
765
122
    while (true) {
766
122
      Reachable.set(Min);
767
768
      // Don't go beyond the outermost scope.
769
122
      if (Min == 0) 
break86
;
770
771
      // Stop if we can't trivially enter the current scope.
772
36
      if (Scopes[Min].InDiag) break;
773
774
0
      Min = Scopes[Min].ParentScope;
775
0
    }
776
777
    // Walk through all the jump sites, checking that they can trivially
778
    // reach this label scope.
779
122
    for (SmallVectorImpl<JumpScope>::iterator
780
256
           I = JumpScopes.begin(), E = JumpScopes.end(); I != E; 
++I134
) {
781
134
      unsigned Scope = I->first;
782
783
      // Walk out the "scope chain" for this scope, looking for a scope
784
      // we've marked reachable.  For well-formed code this amortizes
785
      // to O(JumpScopes.size() / Scopes.size()):  we only iterate
786
      // when we see something unmarked, and in well-formed code we
787
      // mark everything we iterate past.
788
134
      bool IsReachable = false;
789
163
      while (true) {
790
163
        if (Reachable.test(Scope)) {
791
          // If we find something reachable, mark all the scopes we just
792
          // walked through as reachable.
793
115
          for (unsigned S = I->first; S != Scope; 
S = Scopes[S].ParentScope23
)
794
23
            Reachable.set(S);
795
92
          IsReachable = true;
796
92
          break;
797
92
        }
798
799
        // Don't walk out if we've reached the top-level scope or we've
800
        // gotten shallower than the shallowest reachable scope.
801
71
        if (Scope == 0 || 
Scope < Min65
)
break13
;
802
803
        // Don't walk out through an out-diagnostic.
804
58
        if (Scopes[Scope].OutDiag) 
break29
;
805
806
29
        Scope = Scopes[Scope].ParentScope;
807
29
      }
808
809
      // Only diagnose if we didn't find something.
810
134
      if (IsReachable) 
continue92
;
811
812
42
      DiagnoseIndirectOrAsmJump(I->second, I->first, TargetLabel, TargetScope);
813
42
    }
814
122
  }
815
115
}
816
817
/// Return true if a particular error+note combination must be downgraded to a
818
/// warning in Microsoft mode.
819
8
static bool IsMicrosoftJumpWarning(unsigned JumpDiag, unsigned InDiagNote) {
820
8
  return (JumpDiag == diag::err_goto_into_protected_scope &&
821
8
         (InDiagNote == diag::note_protected_by_variable_init ||
822
4
          InDiagNote == diag::note_protected_by_variable_nontriv_destructor));
823
8
}
824
825
/// Return true if a particular note should be downgraded to a compatibility
826
/// warning in C++11 mode.
827
246
static bool IsCXX98CompatWarning(Sema &S, unsigned InDiagNote) {
828
246
  return S.getLangOpts().CPlusPlus11 &&
829
137
         InDiagNote == diag::note_protected_by_variable_non_pod;
830
246
}
831
832
/// Produce primary diagnostic for an indirect jump statement.
833
static void DiagnoseIndirectOrAsmJumpStmt(Sema &S, Stmt *Jump,
834
40
                                          LabelDecl *Target, bool &Diagnosed) {
835
40
  if (Diagnosed)
836
1
    return;
837
39
  bool IsAsmGoto = isa<GCCAsmStmt>(Jump);
838
39
  S.Diag(Jump->getBeginLoc(), diag::err_indirect_goto_in_protected_scope)
839
39
      << IsAsmGoto;
840
39
  S.Diag(Target->getStmt()->getIdentLoc(), diag::note_indirect_goto_target)
841
39
      << IsAsmGoto;
842
39
  Diagnosed = true;
843
39
}
844
845
/// Produce note diagnostics for a jump into a protected scope.
846
221
void JumpScopeChecker::NoteJumpIntoScopes(ArrayRef<unsigned> ToScopes) {
847
221
  if (CHECK_PERMISSIVE(ToScopes.empty()))
848
0
    return;
849
463
  
for (unsigned I = 0, E = ToScopes.size(); 221
I != E;
++I242
)
850
242
    if (Scopes[ToScopes[I]].InDiag)
851
242
      S.Diag(Scopes[ToScopes[I]].Loc, Scopes[ToScopes[I]].InDiag);
852
221
}
853
854
/// Diagnose an indirect jump which is known to cross scopes.
855
void JumpScopeChecker::DiagnoseIndirectOrAsmJump(Stmt *Jump, unsigned JumpScope,
856
                                                 LabelDecl *Target,
857
42
                                                 unsigned TargetScope) {
858
42
  if (CHECK_PERMISSIVE(JumpScope == TargetScope))
859
0
    return;
860
861
42
  unsigned Common = GetDeepestCommonScope(JumpScope, TargetScope);
862
42
  bool Diagnosed = false;
863
864
  // Walk out the scope chain until we reach the common ancestor.
865
88
  for (unsigned I = JumpScope; I != Common; 
I = Scopes[I].ParentScope46
)
866
46
    if (Scopes[I].OutDiag) {
867
30
      DiagnoseIndirectOrAsmJumpStmt(S, Jump, Target, Diagnosed);
868
30
      S.Diag(Scopes[I].Loc, Scopes[I].OutDiag);
869
30
    }
870
871
42
  SmallVector<unsigned, 10> ToScopesCXX98Compat;
872
873
  // Now walk into the scopes containing the label whose address was taken.
874
55
  for (unsigned I = TargetScope; I != Common; 
I = Scopes[I].ParentScope13
)
875
13
    if (IsCXX98CompatWarning(S, Scopes[I].InDiag))
876
3
      ToScopesCXX98Compat.push_back(I);
877
10
    else if (Scopes[I].InDiag) {
878
10
      DiagnoseIndirectOrAsmJumpStmt(S, Jump, Target, Diagnosed);
879
10
      S.Diag(Scopes[I].Loc, Scopes[I].InDiag);
880
10
    }
881
882
  // Diagnose this jump if it would be ill-formed in C++98.
883
42
  if (!Diagnosed && 
!ToScopesCXX98Compat.empty()3
) {
884
3
    bool IsAsmGoto = isa<GCCAsmStmt>(Jump);
885
3
    S.Diag(Jump->getBeginLoc(),
886
3
           diag::warn_cxx98_compat_indirect_goto_in_protected_scope)
887
3
        << IsAsmGoto;
888
3
    S.Diag(Target->getStmt()->getIdentLoc(), diag::note_indirect_goto_target)
889
3
        << IsAsmGoto;
890
3
    NoteJumpIntoScopes(ToScopesCXX98Compat);
891
3
  }
892
42
}
893
894
/// CheckJump - Validate that the specified jump statement is valid: that it is
895
/// jumping within or out of its current scope, not into a deeper one.
896
void JumpScopeChecker::CheckJump(Stmt *From, Stmt *To, SourceLocation DiagLoc,
897
                               unsigned JumpDiagError, unsigned JumpDiagWarning,
898
22.5k
                                 unsigned JumpDiagCXX98Compat) {
899
22.5k
  if (CHECK_PERMISSIVE(!LabelAndGotoScopes.count(From)))
900
0
    return;
901
22.5k
  if (CHECK_PERMISSIVE(!LabelAndGotoScopes.count(To)))
902
0
    return;
903
904
22.5k
  unsigned FromScope = LabelAndGotoScopes[From];
905
22.5k
  unsigned ToScope = LabelAndGotoScopes[To];
906
907
  // Common case: exactly the same scope, which is fine.
908
22.5k
  if (FromScope == ToScope) 
return21.0k
;
909
910
  // Warn on gotos out of __finally blocks.
911
1.49k
  if (isa<GotoStmt>(From) || 
isa<IndirectGotoStmt>(From)52
) {
912
    // If FromScope > ToScope, FromScope is more nested and the jump goes to a
913
    // less nested scope.  Check if it crosses a __finally along the way.
914
6.36k
    for (unsigned I = FromScope; I > ToScope; 
I = Scopes[I].ParentScope4.92k
) {
915
4.93k
      if (Scopes[I].InDiag == diag::note_protected_by_seh_finally) {
916
8
        S.Diag(From->getBeginLoc(), diag::warn_jump_out_of_seh_finally);
917
8
        break;
918
8
      }
919
4.92k
      if (Scopes[I].InDiag == diag::note_omp_protected_structured_block) {
920
4
        S.Diag(From->getBeginLoc(), diag::err_goto_into_protected_scope);
921
4
        S.Diag(To->getBeginLoc(), diag::note_omp_exits_structured_block);
922
4
        break;
923
4
      }
924
4.92k
    }
925
1.44k
  }
926
927
1.49k
  unsigned CommonScope = GetDeepestCommonScope(FromScope, ToScope);
928
929
  // It's okay to jump out from a nested scope.
930
1.49k
  if (CommonScope == ToScope) 
return1.27k
;
931
932
  // Pull out (and reverse) any scopes we might need to diagnose skipping.
933
218
  SmallVector<unsigned, 10> ToScopesCXX98Compat;
934
218
  SmallVector<unsigned, 10> ToScopesError;
935
218
  SmallVector<unsigned, 10> ToScopesWarning;
936
457
  for (unsigned I = ToScope; I != CommonScope; 
I = Scopes[I].ParentScope239
) {
937
239
    if (S.getLangOpts().MSVCCompat && 
JumpDiagWarning != 010
&&
938
8
        IsMicrosoftJumpWarning(JumpDiagError, Scopes[I].InDiag))
939
6
      ToScopesWarning.push_back(I);
940
233
    else if (IsCXX98CompatWarning(S, Scopes[I].InDiag))
941
12
      ToScopesCXX98Compat.push_back(I);
942
221
    else if (Scopes[I].InDiag)
943
221
      ToScopesError.push_back(I);
944
239
  }
945
946
  // Handle warnings.
947
218
  if (!ToScopesWarning.empty()) {
948
6
    S.Diag(DiagLoc, JumpDiagWarning);
949
6
    NoteJumpIntoScopes(ToScopesWarning);
950
6
  }
951
952
  // Handle errors.
953
218
  if (!ToScopesError.empty()) {
954
200
    S.Diag(DiagLoc, JumpDiagError);
955
200
    NoteJumpIntoScopes(ToScopesError);
956
200
  }
957
958
  // Handle -Wc++98-compat warnings if the jump is well-formed.
959
218
  if (ToScopesError.empty() && 
!ToScopesCXX98Compat.empty()18
) {
960
12
    S.Diag(DiagLoc, JumpDiagCXX98Compat);
961
12
    NoteJumpIntoScopes(ToScopesCXX98Compat);
962
12
  }
963
218
}
964
965
3.88k
void JumpScopeChecker::CheckGotoStmt(GotoStmt *GS) {
966
3.88k
  if (GS->getLabel()->isMSAsmLabel()) {
967
4
    S.Diag(GS->getGotoLoc(), diag::err_goto_ms_asm_label)
968
4
        << GS->getLabel()->getIdentifier();
969
4
    S.Diag(GS->getLabel()->getLocation(), diag::note_goto_ms_asm_label)
970
4
        << GS->getLabel()->getIdentifier();
971
4
  }
972
3.88k
}
973
974
5.63k
void Sema::DiagnoseInvalidJumps(Stmt *Body) {
975
5.63k
  (void)JumpScopeChecker(Body, *this);
976
5.63k
}