Coverage Report

Created: 2021-03-06 07:03

/Users/buildslave/jenkins/workspace/coverage/llvm-project/clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
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Source (jump to first uncovered line)
1
//===- ExprEngineCXX.cpp - ExprEngine support for C++ -----------*- 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 defines the C++ expression evaluation engine.
10
//
11
//===----------------------------------------------------------------------===//
12
13
#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
14
#include "clang/Analysis/ConstructionContext.h"
15
#include "clang/AST/DeclCXX.h"
16
#include "clang/AST/StmtCXX.h"
17
#include "clang/AST/ParentMap.h"
18
#include "clang/Basic/PrettyStackTrace.h"
19
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
20
#include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"
21
#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
22
23
using namespace clang;
24
using namespace ento;
25
26
void ExprEngine::CreateCXXTemporaryObject(const MaterializeTemporaryExpr *ME,
27
                                          ExplodedNode *Pred,
28
9.00k
                                          ExplodedNodeSet &Dst) {
29
9.00k
  StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx);
30
9.00k
  const Expr *tempExpr = ME->getSubExpr()->IgnoreParens();
31
9.00k
  ProgramStateRef state = Pred->getState();
32
9.00k
  const LocationContext *LCtx = Pred->getLocationContext();
33
34
9.00k
  state = createTemporaryRegionIfNeeded(state, LCtx, tempExpr, ME);
35
9.00k
  Bldr.generateNode(ME, Pred, state);
36
9.00k
}
37
38
// FIXME: This is the sort of code that should eventually live in a Core
39
// checker rather than as a special case in ExprEngine.
40
void ExprEngine::performTrivialCopy(NodeBuilder &Bldr, ExplodedNode *Pred,
41
12.6k
                                    const CallEvent &Call) {
42
12.6k
  SVal ThisVal;
43
12.6k
  bool AlwaysReturnsLValue;
44
12.6k
  const CXXRecordDecl *ThisRD = nullptr;
45
12.6k
  if (const CXXConstructorCall *Ctor = dyn_cast<CXXConstructorCall>(&Call)) {
46
12.5k
    assert(Ctor->getDecl()->isTrivial());
47
0
    assert(Ctor->getDecl()->isCopyOrMoveConstructor());
48
0
    ThisVal = Ctor->getCXXThisVal();
49
12.5k
    ThisRD = Ctor->getDecl()->getParent();
50
12.5k
    AlwaysReturnsLValue = false;
51
110
  } else {
52
110
    assert(cast<CXXMethodDecl>(Call.getDecl())->isTrivial());
53
0
    assert(cast<CXXMethodDecl>(Call.getDecl())->getOverloadedOperator() ==
54
110
           OO_Equal);
55
0
    ThisVal = cast<CXXInstanceCall>(Call).getCXXThisVal();
56
110
    ThisRD = cast<CXXMethodDecl>(Call.getDecl())->getParent();
57
110
    AlwaysReturnsLValue = true;
58
110
  }
59
60
0
  assert(ThisRD);
61
12.6k
  if (ThisRD->isEmpty()) {
62
    // Do nothing for empty classes. Otherwise it'd retrieve an UnknownVal
63
    // and bind it and RegionStore would think that the actual value
64
    // in this region at this offset is unknown.
65
1.74k
    return;
66
1.74k
  }
67
68
10.9k
  const LocationContext *LCtx = Pred->getLocationContext();
69
70
10.9k
  ExplodedNodeSet Dst;
71
10.9k
  Bldr.takeNodes(Pred);
72
73
10.9k
  SVal V = Call.getArgSVal(0);
74
75
  // If the value being copied is not unknown, load from its location to get
76
  // an aggregate rvalue.
77
10.9k
  if (Optional<Loc> L = V.getAs<Loc>())
78
10.9k
    V = Pred->getState()->getSVal(*L);
79
10
  else
80
10
    assert(V.isUnknownOrUndef());
81
82
0
  const Expr *CallExpr = Call.getOriginExpr();
83
10.9k
  evalBind(Dst, CallExpr, Pred, ThisVal, V, true);
84
85
10.9k
  PostStmt PS(CallExpr, LCtx);
86
10.9k
  for (ExplodedNodeSet::iterator I = Dst.begin(), E = Dst.end();
87
21.8k
       I != E; 
++I10.9k
) {
88
10.9k
    ProgramStateRef State = (*I)->getState();
89
10.9k
    if (AlwaysReturnsLValue)
90
79
      State = State->BindExpr(CallExpr, LCtx, ThisVal);
91
10.8k
    else
92
10.8k
      State = bindReturnValue(Call, LCtx, State);
93
10.9k
    Bldr.generateNode(PS, State, *I);
94
10.9k
  }
95
10.9k
}
96
97
98
SVal ExprEngine::makeZeroElementRegion(ProgramStateRef State, SVal LValue,
99
10.6k
                                       QualType &Ty, bool &IsArray) {
100
10.6k
  SValBuilder &SVB = State->getStateManager().getSValBuilder();
101
10.6k
  ASTContext &Ctx = SVB.getContext();
102
103
10.7k
  while (const ArrayType *AT = Ctx.getAsArrayType(Ty)) {
104
138
    Ty = AT->getElementType();
105
138
    LValue = State->getLValue(Ty, SVB.makeZeroArrayIndex(), LValue);
106
138
    IsArray = true;
107
138
  }
108
109
10.6k
  return LValue;
110
10.6k
}
111
112
SVal ExprEngine::computeObjectUnderConstruction(
113
    const Expr *E, ProgramStateRef State, const LocationContext *LCtx,
114
33.0k
    const ConstructionContext *CC, EvalCallOptions &CallOpts) {
115
33.0k
  SValBuilder &SVB = getSValBuilder();
116
33.0k
  MemRegionManager &MRMgr = SVB.getRegionManager();
117
33.0k
  ASTContext &ACtx = SVB.getContext();
118
119
  // Compute the target region by exploring the construction context.
120
33.0k
  if (CC) {
121
32.7k
    switch (CC->getKind()) {
122
26
    case ConstructionContext::CXX17ElidedCopyVariableKind:
123
7.38k
    case ConstructionContext::SimpleVariableKind: {
124
7.38k
      const auto *DSCC = cast<VariableConstructionContext>(CC);
125
7.38k
      const auto *DS = DSCC->getDeclStmt();
126
7.38k
      const auto *Var = cast<VarDecl>(DS->getSingleDecl());
127
7.38k
      QualType Ty = Var->getType();
128
7.38k
      return makeZeroElementRegion(State, State->getLValue(Var, LCtx), Ty,
129
7.38k
                                   CallOpts.IsArrayCtorOrDtor);
130
26
    }
131
4
    case ConstructionContext::CXX17ElidedCopyConstructorInitializerKind:
132
2.58k
    case ConstructionContext::SimpleConstructorInitializerKind: {
133
2.58k
      const auto *ICC = cast<ConstructorInitializerConstructionContext>(CC);
134
2.58k
      const auto *Init = ICC->getCXXCtorInitializer();
135
2.58k
      const CXXMethodDecl *CurCtor = cast<CXXMethodDecl>(LCtx->getDecl());
136
2.58k
      Loc ThisPtr = SVB.getCXXThis(CurCtor, LCtx->getStackFrame());
137
2.58k
      SVal ThisVal = State->getSVal(ThisPtr);
138
2.58k
      if (Init->isBaseInitializer()) {
139
2
        const auto *ThisReg = cast<SubRegion>(ThisVal.getAsRegion());
140
2
        const CXXRecordDecl *BaseClass =
141
2
          Init->getBaseClass()->getAsCXXRecordDecl();
142
2
        const auto *BaseReg =
143
2
          MRMgr.getCXXBaseObjectRegion(BaseClass, ThisReg,
144
2
                                       Init->isBaseVirtual());
145
2
        return SVB.makeLoc(BaseReg);
146
2
      }
147
2.57k
      if (Init->isDelegatingInitializer())
148
1
        return ThisVal;
149
150
2.57k
      const ValueDecl *Field;
151
2.57k
      SVal FieldVal;
152
2.57k
      if (Init->isIndirectMemberInitializer()) {
153
0
        Field = Init->getIndirectMember();
154
0
        FieldVal = State->getLValue(Init->getIndirectMember(), ThisVal);
155
2.57k
      } else {
156
2.57k
        Field = Init->getMember();
157
2.57k
        FieldVal = State->getLValue(Init->getMember(), ThisVal);
158
2.57k
      }
159
160
2.57k
      QualType Ty = Field->getType();
161
2.57k
      return makeZeroElementRegion(State, FieldVal, Ty,
162
2.57k
                                   CallOpts.IsArrayCtorOrDtor);
163
2.57k
    }
164
490
    case ConstructionContext::NewAllocatedObjectKind: {
165
490
      if (AMgr.getAnalyzerOptions().MayInlineCXXAllocator) {
166
487
        const auto *NECC = cast<NewAllocatedObjectConstructionContext>(CC);
167
487
        const auto *NE = NECC->getCXXNewExpr();
168
487
        SVal V = *getObjectUnderConstruction(State, NE, LCtx);
169
487
        if (const SubRegion *MR =
170
475
                dyn_cast_or_null<SubRegion>(V.getAsRegion())) {
171
475
          if (NE->isArray()) {
172
            // TODO: In fact, we need to call the constructor for every
173
            // allocated element, not just the first one!
174
41
            CallOpts.IsArrayCtorOrDtor = true;
175
41
            return loc::MemRegionVal(getStoreManager().GetElementZeroRegion(
176
41
                MR, NE->getType()->getPointeeType()));
177
41
          }
178
434
          return  V;
179
475
        }
180
        // TODO: Detect when the allocator returns a null pointer.
181
        // Constructor shall not be called in this case.
182
487
      }
183
15
      break;
184
490
    }
185
2.41k
    case ConstructionContext::SimpleReturnedValueKind:
186
2.45k
    case ConstructionContext::CXX17ElidedCopyReturnedValueKind: {
187
      // The temporary is to be managed by the parent stack frame.
188
      // So build it in the parent stack frame if we're not in the
189
      // top frame of the analysis.
190
2.45k
      const StackFrameContext *SFC = LCtx->getStackFrame();
191
2.45k
      if (const LocationContext *CallerLCtx = SFC->getParent()) {
192
2.39k
        auto RTC = (*SFC->getCallSiteBlock())[SFC->getIndex()]
193
2.39k
                       .getAs<CFGCXXRecordTypedCall>();
194
2.39k
        if (!RTC) {
195
          // We were unable to find the correct construction context for the
196
          // call in the parent stack frame. This is equivalent to not being
197
          // able to find construction context at all.
198
331
          break;
199
331
        }
200
2.06k
        if (isa<BlockInvocationContext>(CallerLCtx)) {
201
          // Unwrap block invocation contexts. They're mostly part of
202
          // the current stack frame.
203
1
          CallerLCtx = CallerLCtx->getParent();
204
1
          assert(!isa<BlockInvocationContext>(CallerLCtx));
205
1
        }
206
0
        return computeObjectUnderConstruction(
207
2.06k
            cast<Expr>(SFC->getCallSite()), State, CallerLCtx,
208
2.06k
            RTC->getConstructionContext(), CallOpts);
209
57
      } else {
210
        // We are on the top frame of the analysis. We do not know where is the
211
        // object returned to. Conjure a symbolic region for the return value.
212
        // TODO: We probably need a new MemRegion kind to represent the storage
213
        // of that SymbolicRegion, so that we cound produce a fancy symbol
214
        // instead of an anonymous conjured symbol.
215
        // TODO: Do we need to track the region to avoid having it dead
216
        // too early? It does die too early, at least in C++17, but because
217
        // putting anything into a SymbolicRegion causes an immediate escape,
218
        // it doesn't cause any leak false positives.
219
57
        const auto *RCC = cast<ReturnedValueConstructionContext>(CC);
220
        // Make sure that this doesn't coincide with any other symbol
221
        // conjured for the returned expression.
222
57
        static const int TopLevelSymRegionTag = 0;
223
57
        const Expr *RetE = RCC->getReturnStmt()->getRetValue();
224
57
        assert(RetE && "Void returns should not have a construction context");
225
0
        QualType ReturnTy = RetE->getType();
226
57
        QualType RegionTy = ACtx.getPointerType(ReturnTy);
227
57
        return SVB.conjureSymbolVal(&TopLevelSymRegionTag, RetE, SFC, RegionTy,
228
57
                                    currBldrCtx->blockCount());
229
57
      }
230
2.45k
      
llvm_unreachable0
("Unhandled return value construction context!");
231
2.45k
    }
232
6.61k
    case ConstructionContext::ElidedTemporaryObjectKind: {
233
6.61k
      assert(AMgr.getAnalyzerOptions().ShouldElideConstructors);
234
0
      const auto *TCC = cast<ElidedTemporaryObjectConstructionContext>(CC);
235
236
      // Support pre-C++17 copy elision. We'll have the elidable copy
237
      // constructor in the AST and in the CFG, but we'll skip it
238
      // and construct directly into the final object. This call
239
      // also sets the CallOpts flags for us.
240
      // If the elided copy/move constructor is not supported, there's still
241
      // benefit in trying to model the non-elided constructor.
242
      // Stash our state before trying to elide, as it'll get overwritten.
243
6.61k
      ProgramStateRef PreElideState = State;
244
6.61k
      EvalCallOptions PreElideCallOpts = CallOpts;
245
246
6.61k
      SVal V = computeObjectUnderConstruction(
247
6.61k
          TCC->getConstructorAfterElision(), State, LCtx,
248
6.61k
          TCC->getConstructionContextAfterElision(), CallOpts);
249
250
      // FIXME: This definition of "copy elision has not failed" is unreliable.
251
      // It doesn't indicate that the constructor will actually be inlined
252
      // later; this is still up to evalCall() to decide.
253
6.61k
      if (!CallOpts.IsCtorOrDtorWithImproperlyModeledTargetRegion)
254
6.48k
        return V;
255
256
      // Copy elision failed. Revert the changes and proceed as if we have
257
      // a simple temporary.
258
131
      CallOpts = PreElideCallOpts;
259
131
      CallOpts.IsElidableCtorThatHasNotBeenElided = true;
260
131
      LLVM_FALLTHROUGH;
261
131
    }
262
2.08k
    case ConstructionContext::SimpleTemporaryObjectKind: {
263
2.08k
      const auto *TCC = cast<TemporaryObjectConstructionContext>(CC);
264
2.08k
      const MaterializeTemporaryExpr *MTE = TCC->getMaterializedTemporaryExpr();
265
266
2.08k
      CallOpts.IsTemporaryCtorOrDtor = true;
267
2.08k
      if (MTE) {
268
1.96k
        if (const ValueDecl *VD = MTE->getExtendingDecl()) {
269
183
          assert(MTE->getStorageDuration() != SD_FullExpression);
270
183
          if (!VD->getType()->isReferenceType()) {
271
            // We're lifetime-extended by a surrounding aggregate.
272
            // Automatic destructors aren't quite working in this case
273
            // on the CFG side. We should warn the caller about that.
274
            // FIXME: Is there a better way to retrieve this information from
275
            // the MaterializeTemporaryExpr?
276
24
            CallOpts.IsTemporaryLifetimeExtendedViaAggregate = true;
277
24
          }
278
183
        }
279
280
1.96k
        if (MTE->getStorageDuration() == SD_Static ||
281
1.95k
            MTE->getStorageDuration() == SD_Thread)
282
14
          return loc::MemRegionVal(MRMgr.getCXXStaticTempObjectRegion(E));
283
1.96k
      }
284
285
2.06k
      return loc::MemRegionVal(MRMgr.getCXXTempObjectRegion(E, LCtx));
286
2.08k
    }
287
11.2k
    case ConstructionContext::ArgumentKind: {
288
      // Arguments are technically temporaries.
289
11.2k
      CallOpts.IsTemporaryCtorOrDtor = true;
290
291
11.2k
      const auto *ACC = cast<ArgumentConstructionContext>(CC);
292
11.2k
      const Expr *E = ACC->getCallLikeExpr();
293
11.2k
      unsigned Idx = ACC->getIndex();
294
295
11.2k
      CallEventManager &CEMgr = getStateManager().getCallEventManager();
296
11.2k
      auto getArgLoc = [&](CallEventRef<> Caller) -> Optional<SVal> {
297
11.2k
        const LocationContext *FutureSFC =
298
11.2k
            Caller->getCalleeStackFrame(currBldrCtx->blockCount());
299
        // Return early if we are unable to reliably foresee
300
        // the future stack frame.
301
11.2k
        if (!FutureSFC)
302
0
          return None;
303
304
        // This should be equivalent to Caller->getDecl() for now, but
305
        // FutureSFC->getDecl() is likely to support better stuff (like
306
        // virtual functions) earlier.
307
11.2k
        const Decl *CalleeD = FutureSFC->getDecl();
308
309
        // FIXME: Support for variadic arguments is not implemented here yet.
310
11.2k
        if (CallEvent::isVariadic(CalleeD))
311
0
          return None;
312
313
        // Operator arguments do not correspond to operator parameters
314
        // because this-argument is implemented as a normal argument in
315
        // operator call expressions but not in operator declarations.
316
11.2k
        const TypedValueRegion *TVR = Caller->getParameterLocation(
317
11.2k
            *Caller->getAdjustedParameterIndex(Idx), currBldrCtx->blockCount());
318
11.2k
        if (!TVR)
319
0
          return None;
320
321
11.2k
        return loc::MemRegionVal(TVR);
322
11.2k
      };
323
324
11.2k
      if (const auto *CE = dyn_cast<CallExpr>(E)) {
325
11.1k
        CallEventRef<> Caller = CEMgr.getSimpleCall(CE, State, LCtx);
326
11.1k
        if (Optional<SVal> V = getArgLoc(Caller))
327
11.1k
          return *V;
328
0
        else
329
0
          break;
330
58
      } else if (const auto *CCE = dyn_cast<CXXConstructExpr>(E)) {
331
        // Don't bother figuring out the target region for the future
332
        // constructor because we won't need it.
333
48
        CallEventRef<> Caller =
334
48
            CEMgr.getCXXConstructorCall(CCE, /*Target=*/nullptr, State, LCtx);
335
48
        if (Optional<SVal> V = getArgLoc(Caller))
336
48
          return *V;
337
0
        else
338
0
          break;
339
10
      } else if (const auto *ME = dyn_cast<ObjCMessageExpr>(E)) {
340
10
        CallEventRef<> Caller = CEMgr.getObjCMethodCall(ME, State, LCtx);
341
10
        if (Optional<SVal> V = getArgLoc(Caller))
342
10
          return *V;
343
0
        else
344
0
          break;
345
10
      }
346
11.2k
    }
347
32.7k
    } // switch (CC->getKind())
348
32.7k
  }
349
350
  // If we couldn't find an existing region to construct into, assume we're
351
  // constructing a temporary. Notify the caller of our failure.
352
645
  CallOpts.IsCtorOrDtorWithImproperlyModeledTargetRegion = true;
353
645
  return loc::MemRegionVal(MRMgr.getCXXTempObjectRegion(E, LCtx));
354
33.0k
}
355
356
ProgramStateRef ExprEngine::updateObjectsUnderConstruction(
357
    SVal V, const Expr *E, ProgramStateRef State, const LocationContext *LCtx,
358
32.8k
    const ConstructionContext *CC, const EvalCallOptions &CallOpts) {
359
32.8k
  if (CallOpts.IsCtorOrDtorWithImproperlyModeledTargetRegion) {
360
    // Sounds like we failed to find the target region and therefore
361
    // copy elision failed. There's nothing we can do about it here.
362
514
    return State;
363
514
  }
364
365
  // See if we're constructing an existing region by looking at the
366
  // current construction context.
367
32.3k
  assert(CC && "Computed target region without construction context?");
368
0
  switch (CC->getKind()) {
369
26
  case ConstructionContext::CXX17ElidedCopyVariableKind:
370
7.37k
  case ConstructionContext::SimpleVariableKind: {
371
7.37k
    const auto *DSCC = cast<VariableConstructionContext>(CC);
372
7.37k
    return addObjectUnderConstruction(State, DSCC->getDeclStmt(), LCtx, V);
373
26
    }
374
4
    case ConstructionContext::CXX17ElidedCopyConstructorInitializerKind:
375
2.57k
    case ConstructionContext::SimpleConstructorInitializerKind: {
376
2.57k
      const auto *ICC = cast<ConstructorInitializerConstructionContext>(CC);
377
2.57k
      const auto *Init = ICC->getCXXCtorInitializer();
378
      // Base and delegating initializers handled above
379
2.57k
      assert(Init->isAnyMemberInitializer() &&
380
2.57k
             "Base and delegating initializers should have been handled by"
381
2.57k
             "computeObjectUnderConstruction()");
382
0
      return addObjectUnderConstruction(State, Init, LCtx, V);
383
4
    }
384
475
    case ConstructionContext::NewAllocatedObjectKind: {
385
475
      return State;
386
4
    }
387
2.07k
    case ConstructionContext::SimpleReturnedValueKind:
388
2.11k
    case ConstructionContext::CXX17ElidedCopyReturnedValueKind: {
389
2.11k
      const StackFrameContext *SFC = LCtx->getStackFrame();
390
2.11k
      const LocationContext *CallerLCtx = SFC->getParent();
391
2.11k
      if (!CallerLCtx) {
392
        // No extra work is necessary in top frame.
393
57
        return State;
394
57
      }
395
396
2.06k
      auto RTC = (*SFC->getCallSiteBlock())[SFC->getIndex()]
397
2.06k
                     .getAs<CFGCXXRecordTypedCall>();
398
2.06k
      assert(RTC && "Could not have had a target region without it");
399
2.06k
      if (isa<BlockInvocationContext>(CallerLCtx)) {
400
        // Unwrap block invocation contexts. They're mostly part of
401
        // the current stack frame.
402
1
        CallerLCtx = CallerLCtx->getParent();
403
1
        assert(!isa<BlockInvocationContext>(CallerLCtx));
404
1
      }
405
406
0
      return updateObjectsUnderConstruction(V,
407
2.06k
          cast<Expr>(SFC->getCallSite()), State, CallerLCtx,
408
2.06k
          RTC->getConstructionContext(), CallOpts);
409
2.11k
    }
410
6.61k
    case ConstructionContext::ElidedTemporaryObjectKind: {
411
6.61k
      assert(AMgr.getAnalyzerOptions().ShouldElideConstructors);
412
6.61k
      if (!CallOpts.IsElidableCtorThatHasNotBeenElided) {
413
6.48k
        const auto *TCC = cast<ElidedTemporaryObjectConstructionContext>(CC);
414
6.48k
        State = updateObjectsUnderConstruction(
415
6.48k
            V, TCC->getConstructorAfterElision(), State, LCtx,
416
6.48k
            TCC->getConstructionContextAfterElision(), CallOpts);
417
418
        // Remember that we've elided the constructor.
419
6.48k
        State = addObjectUnderConstruction(
420
6.48k
            State, TCC->getConstructorAfterElision(), LCtx, V);
421
422
        // Remember that we've elided the destructor.
423
6.48k
        if (const auto *BTE = TCC->getCXXBindTemporaryExpr())
424
588
          State = elideDestructor(State, BTE, LCtx);
425
426
        // Instead of materialization, shamelessly return
427
        // the final object destination.
428
6.48k
        if (const auto *MTE = TCC->getMaterializedTemporaryExpr())
429
6.48k
          State = addObjectUnderConstruction(State, MTE, LCtx, V);
430
431
6.48k
        return State;
432
6.48k
      }
433
      // If we decided not to elide the constructor, proceed as if
434
      // it's a simple temporary.
435
131
      LLVM_FALLTHROUGH;
436
131
    }
437
2.08k
    case ConstructionContext::SimpleTemporaryObjectKind: {
438
2.08k
      const auto *TCC = cast<TemporaryObjectConstructionContext>(CC);
439
2.08k
      if (const auto *BTE = TCC->getCXXBindTemporaryExpr())
440
350
        State = addObjectUnderConstruction(State, BTE, LCtx, V);
441
442
2.08k
      if (const auto *MTE = TCC->getMaterializedTemporaryExpr())
443
1.96k
        State = addObjectUnderConstruction(State, MTE, LCtx, V);
444
445
2.08k
      return State;
446
131
    }
447
11.2k
    case ConstructionContext::ArgumentKind: {
448
11.2k
      const auto *ACC = cast<ArgumentConstructionContext>(CC);
449
11.2k
      if (const auto *BTE = ACC->getCXXBindTemporaryExpr())
450
293
        State = addObjectUnderConstruction(State, BTE, LCtx, V);
451
452
11.2k
      return addObjectUnderConstruction(
453
11.2k
          State, {ACC->getCallLikeExpr(), ACC->getIndex()}, LCtx, V);
454
131
    }
455
32.3k
  }
456
32.3k
  
llvm_unreachable0
("Unhandled construction context!");
457
32.3k
}
458
459
void ExprEngine::handleConstructor(const Expr *E,
460
                                   ExplodedNode *Pred,
461
29.5k
                                   ExplodedNodeSet &destNodes) {
462
29.5k
  const auto *CE = dyn_cast<CXXConstructExpr>(E);
463
29.5k
  const auto *CIE = dyn_cast<CXXInheritedCtorInitExpr>(E);
464
29.5k
  assert(CE || CIE);
465
466
0
  const LocationContext *LCtx = Pred->getLocationContext();
467
29.5k
  ProgramStateRef State = Pred->getState();
468
469
29.5k
  SVal Target = UnknownVal();
470
471
29.5k
  if (CE) {
472
29.5k
    if (Optional<SVal> ElidedTarget =
473
6.48k
            getObjectUnderConstruction(State, CE, LCtx)) {
474
      // We've previously modeled an elidable constructor by pretending that it
475
      // in fact constructs into the correct target. This constructor can
476
      // therefore be skipped.
477
6.48k
      Target = *ElidedTarget;
478
6.48k
      StmtNodeBuilder Bldr(Pred, destNodes, *currBldrCtx);
479
6.48k
      State = finishObjectConstruction(State, CE, LCtx);
480
6.48k
      if (auto L = Target.getAs<Loc>())
481
6.48k
        State = State->BindExpr(CE, LCtx, State->getSVal(*L, CE->getType()));
482
6.48k
      Bldr.generateNode(CE, Pred, State);
483
6.48k
      return;
484
6.48k
    }
485
29.5k
  }
486
487
  // FIXME: Handle arrays, which run the same constructor for every element.
488
  // For now, we just run the first constructor (which should still invalidate
489
  // the entire array).
490
491
23.0k
  EvalCallOptions CallOpts;
492
23.0k
  auto C = getCurrentCFGElement().getAs<CFGConstructor>();
493
23.0k
  assert(C || getCurrentCFGElement().getAs<CFGStmt>());
494
23.0k
  const ConstructionContext *CC = C ? 
C->getConstructionContext()22.7k
:
nullptr328
;
495
496
23.0k
  const CXXConstructExpr::ConstructionKind CK =
497
23.0k
      CE ? 
CE->getConstructionKind()23.0k
:
CIE->getConstructionKind()5
;
498
23.0k
  switch (CK) {
499
22.2k
  case CXXConstructExpr::CK_Complete: {
500
    // Inherited constructors are always base class constructors.
501
22.2k
    assert(CE && !CIE && "A complete constructor is inherited?!");
502
503
    // The target region is found from construction context.
504
0
    std::tie(State, Target) =
505
22.2k
        handleConstructionContext(CE, State, LCtx, CC, CallOpts);
506
22.2k
    break;
507
0
  }
508
116
  case CXXConstructExpr::CK_VirtualBase: {
509
    // Make sure we are not calling virtual base class initializers twice.
510
    // Only the most-derived object should initialize virtual base classes.
511
116
    const auto *OuterCtor = dyn_cast_or_null<CXXConstructExpr>(
512
116
        LCtx->getStackFrame()->getCallSite());
513
116
    assert(
514
116
        (!OuterCtor ||
515
116
         OuterCtor->getConstructionKind() == CXXConstructExpr::CK_Complete ||
516
116
         OuterCtor->getConstructionKind() == CXXConstructExpr::CK_Delegating) &&
517
116
        ("This virtual base should have already been initialized by "
518
116
         "the most derived class!"));
519
0
    (void)OuterCtor;
520
116
    LLVM_FALLTHROUGH;
521
116
  }
522
761
  case CXXConstructExpr::CK_NonVirtualBase:
523
    // In C++17, classes with non-virtual bases may be aggregates, so they would
524
    // be initialized as aggregates without a constructor call, so we may have
525
    // a base class constructed directly into an initializer list without
526
    // having the derived-class constructor call on the previous stack frame.
527
    // Initializer lists may be nested into more initializer lists that
528
    // correspond to surrounding aggregate initializations.
529
    // FIXME: For now this code essentially bails out. We need to find the
530
    // correct target region and set it.
531
    // FIXME: Instead of relying on the ParentMap, we should have the
532
    // trigger-statement (InitListExpr in this case) passed down from CFG or
533
    // otherwise always available during construction.
534
761
    if (dyn_cast_or_null<InitListExpr>(LCtx->getParentMap().getParent(E))) {
535
24
      MemRegionManager &MRMgr = getSValBuilder().getRegionManager();
536
24
      Target = loc::MemRegionVal(MRMgr.getCXXTempObjectRegion(E, LCtx));
537
24
      CallOpts.IsCtorOrDtorWithImproperlyModeledTargetRegion = true;
538
24
      break;
539
24
    }
540
737
    LLVM_FALLTHROUGH;
541
748
  case CXXConstructExpr::CK_Delegating: {
542
748
    const CXXMethodDecl *CurCtor = cast<CXXMethodDecl>(LCtx->getDecl());
543
748
    Loc ThisPtr = getSValBuilder().getCXXThis(CurCtor,
544
748
                                              LCtx->getStackFrame());
545
748
    SVal ThisVal = State->getSVal(ThisPtr);
546
547
748
    if (CK == CXXConstructExpr::CK_Delegating) {
548
11
      Target = ThisVal;
549
737
    } else {
550
      // Cast to the base type.
551
737
      bool IsVirtual = (CK == CXXConstructExpr::CK_VirtualBase);
552
737
      SVal BaseVal =
553
737
          getStoreManager().evalDerivedToBase(ThisVal, E->getType(), IsVirtual);
554
737
      Target = BaseVal;
555
737
    }
556
748
    break;
557
737
  }
558
23.0k
  }
559
560
23.0k
  if (State != Pred->getState()) {
561
21.2k
    static SimpleProgramPointTag T("ExprEngine",
562
21.2k
                                   "Prepare for object construction");
563
21.2k
    ExplodedNodeSet DstPrepare;
564
21.2k
    StmtNodeBuilder BldrPrepare(Pred, DstPrepare, *currBldrCtx);
565
21.2k
    BldrPrepare.generateNode(E, Pred, State, &T, ProgramPoint::PreStmtKind);
566
21.2k
    assert(DstPrepare.size() <= 1);
567
21.2k
    if (DstPrepare.size() == 0)
568
27
      return;
569
21.2k
    Pred = *BldrPrepare.begin();
570
21.2k
  }
571
572
23.0k
  const MemRegion *TargetRegion = Target.getAsRegion();
573
23.0k
  CallEventManager &CEMgr = getStateManager().getCallEventManager();
574
23.0k
  CallEventRef<> Call =
575
23.0k
      CIE ? (CallEventRef<>)CEMgr.getCXXInheritedConstructorCall(
576
5
                CIE, TargetRegion, State, LCtx)
577
23.0k
          : (CallEventRef<>)CEMgr.getCXXConstructorCall(
578
23.0k
                CE, TargetRegion, State, LCtx);
579
580
23.0k
  ExplodedNodeSet DstPreVisit;
581
23.0k
  getCheckerManager().runCheckersForPreStmt(DstPreVisit, Pred, E, *this);
582
583
23.0k
  ExplodedNodeSet PreInitialized;
584
23.0k
  if (CE) {
585
    // FIXME: Is it possible and/or useful to do this before PreStmt?
586
23.0k
    StmtNodeBuilder Bldr(DstPreVisit, PreInitialized, *currBldrCtx);
587
23.0k
    for (ExplodedNodeSet::iterator I = DstPreVisit.begin(),
588
23.0k
                                   E = DstPreVisit.end();
589
46.0k
         I != E; 
++I23.0k
) {
590
23.0k
      ProgramStateRef State = (*I)->getState();
591
23.0k
      if (CE->requiresZeroInitialization()) {
592
        // FIXME: Once we properly handle constructors in new-expressions, we'll
593
        // need to invalidate the region before setting a default value, to make
594
        // sure there aren't any lingering bindings around. This probably needs
595
        // to happen regardless of whether or not the object is zero-initialized
596
        // to handle random fields of a placement-initialized object picking up
597
        // old bindings. We might only want to do it when we need to, though.
598
        // FIXME: This isn't actually correct for arrays -- we need to zero-
599
        // initialize the entire array, not just the first element -- but our
600
        // handling of arrays everywhere else is weak as well, so this shouldn't
601
        // actually make things worse. Placement new makes this tricky as well,
602
        // since it's then possible to be initializing one part of a multi-
603
        // dimensional array.
604
1.95k
        State = State->bindDefaultZero(Target, LCtx);
605
1.95k
      }
606
607
23.0k
      Bldr.generateNode(CE, *I, State, /*tag=*/nullptr,
608
23.0k
                        ProgramPoint::PreStmtKind);
609
23.0k
    }
610
5
  } else {
611
5
    PreInitialized = DstPreVisit;
612
5
  }
613
614
23.0k
  ExplodedNodeSet DstPreCall;
615
23.0k
  getCheckerManager().runCheckersForPreCall(DstPreCall, PreInitialized,
616
23.0k
                                            *Call, *this);
617
618
23.0k
  ExplodedNodeSet DstEvaluated;
619
620
23.0k
  if (CE && 
CE->getConstructor()->isTrivial()23.0k
&&
621
15.3k
      CE->getConstructor()->isCopyOrMoveConstructor() &&
622
12.5k
      !CallOpts.IsArrayCtorOrDtor) {
623
12.5k
    StmtNodeBuilder Bldr(DstPreCall, DstEvaluated, *currBldrCtx);
624
    // FIXME: Handle other kinds of trivial constructors as well.
625
12.5k
    for (ExplodedNodeSet::iterator I = DstPreCall.begin(), E = DstPreCall.end();
626
25.1k
         I != E; 
++I12.5k
)
627
12.5k
      performTrivialCopy(Bldr, *I, *Call);
628
629
10.4k
  } else {
630
10.4k
    for (ExplodedNodeSet::iterator I = DstPreCall.begin(), E = DstPreCall.end();
631
20.9k
         I != E; 
++I10.4k
)
632
10.4k
      getCheckerManager().runCheckersForEvalCall(DstEvaluated, *I, *Call, *this,
633
10.4k
                                                 CallOpts);
634
10.4k
  }
635
636
  // If the CFG was constructed without elements for temporary destructors
637
  // and the just-called constructor created a temporary object then
638
  // stop exploration if the temporary object has a noreturn constructor.
639
  // This can lose coverage because the destructor, if it were present
640
  // in the CFG, would be called at the end of the full expression or
641
  // later (for life-time extended temporaries) -- but avoids infeasible
642
  // paths when no-return temporary destructors are used for assertions.
643
23.0k
  ExplodedNodeSet DstEvaluatedPostProcessed;
644
23.0k
  StmtNodeBuilder Bldr(DstEvaluated, DstEvaluatedPostProcessed, *currBldrCtx);
645
23.0k
  const AnalysisDeclContext *ADC = LCtx->getAnalysisDeclContext();
646
23.0k
  if (!ADC->getCFGBuildOptions().AddTemporaryDtors) {
647
283
    if (llvm::isa_and_nonnull<CXXTempObjectRegion>(TargetRegion) &&
648
110
        cast<CXXConstructorDecl>(Call->getDecl())
649
110
            ->getParent()
650
4
            ->isAnyDestructorNoReturn()) {
651
652
      // If we've inlined the constructor, then DstEvaluated would be empty.
653
      // In this case we still want a sink, which could be implemented
654
      // in processCallExit. But we don't have that implemented at the moment,
655
      // so if you hit this assertion, see if you can avoid inlining
656
      // the respective constructor when analyzer-config cfg-temporary-dtors
657
      // is set to false.
658
      // Otherwise there's nothing wrong with inlining such constructor.
659
4
      assert(!DstEvaluated.empty() &&
660
4
             "We should not have inlined this constructor!");
661
662
4
      for (ExplodedNode *N : DstEvaluated) {
663
4
        Bldr.generateSink(E, N, N->getState());
664
4
      }
665
666
      // There is no need to run the PostCall and PostStmt checker
667
      // callbacks because we just generated sinks on all nodes in th
668
      // frontier.
669
4
      return;
670
4
    }
671
283
  }
672
673
23.0k
  ExplodedNodeSet DstPostArgumentCleanup;
674
23.0k
  for (ExplodedNode *I : DstEvaluatedPostProcessed)
675
14.2k
    finishArgumentConstruction(DstPostArgumentCleanup, I, *Call);
676
677
  // If there were other constructors called for object-type arguments
678
  // of this constructor, clean them up.
679
23.0k
  ExplodedNodeSet DstPostCall;
680
23.0k
  getCheckerManager().runCheckersForPostCall(DstPostCall,
681
23.0k
                                             DstPostArgumentCleanup,
682
23.0k
                                             *Call, *this);
683
23.0k
  getCheckerManager().runCheckersForPostStmt(destNodes, DstPostCall, E, *this);
684
23.0k
}
685
686
void ExprEngine::VisitCXXConstructExpr(const CXXConstructExpr *CE,
687
                                       ExplodedNode *Pred,
688
29.5k
                                       ExplodedNodeSet &Dst) {
689
29.5k
  handleConstructor(CE, Pred, Dst);
690
29.5k
}
691
692
void ExprEngine::VisitCXXInheritedCtorInitExpr(
693
    const CXXInheritedCtorInitExpr *CE, ExplodedNode *Pred,
694
5
    ExplodedNodeSet &Dst) {
695
5
  handleConstructor(CE, Pred, Dst);
696
5
}
697
698
void ExprEngine::VisitCXXDestructor(QualType ObjectType,
699
                                    const MemRegion *Dest,
700
                                    const Stmt *S,
701
                                    bool IsBaseDtor,
702
                                    ExplodedNode *Pred,
703
                                    ExplodedNodeSet &Dst,
704
1.50k
                                    EvalCallOptions &CallOpts) {
705
1.50k
  assert(S && "A destructor without a trigger!");
706
0
  const LocationContext *LCtx = Pred->getLocationContext();
707
1.50k
  ProgramStateRef State = Pred->getState();
708
709
1.50k
  const CXXRecordDecl *RecordDecl = ObjectType->getAsCXXRecordDecl();
710
1.50k
  assert(RecordDecl && "Only CXXRecordDecls should have destructors");
711
0
  const CXXDestructorDecl *DtorDecl = RecordDecl->getDestructor();
712
  // FIXME: There should always be a Decl, otherwise the destructor call
713
  // shouldn't have been added to the CFG in the first place.
714
1.50k
  if (!DtorDecl) {
715
    // Skip the invalid destructor. We cannot simply return because
716
    // it would interrupt the analysis instead.
717
1
    static SimpleProgramPointTag T("ExprEngine", "SkipInvalidDestructor");
718
    // FIXME: PostImplicitCall with a null decl may crash elsewhere anyway.
719
1
    PostImplicitCall PP(/*Decl=*/nullptr, S->getEndLoc(), LCtx, &T);
720
1
    NodeBuilder Bldr(Pred, Dst, *currBldrCtx);
721
1
    Bldr.generateNode(PP, Pred->getState(), Pred);
722
1
    return;
723
1
  }
724
725
1.50k
  if (!Dest) {
726
    // We're trying to destroy something that is not a region. This may happen
727
    // for a variety of reasons (unknown target region, concrete integer instead
728
    // of target region, etc.). The current code makes an attempt to recover.
729
    // FIXME: We probably don't really need to recover when we're dealing
730
    // with concrete integers specifically.
731
70
    CallOpts.IsCtorOrDtorWithImproperlyModeledTargetRegion = true;
732
70
    if (const Expr *E = dyn_cast_or_null<Expr>(S)) {
733
68
      Dest = MRMgr.getCXXTempObjectRegion(E, Pred->getLocationContext());
734
2
    } else {
735
2
      static SimpleProgramPointTag T("ExprEngine", "SkipInvalidDestructor");
736
2
      NodeBuilder Bldr(Pred, Dst, *currBldrCtx);
737
2
      Bldr.generateSink(Pred->getLocation().withTag(&T),
738
2
                        Pred->getState(), Pred);
739
2
      return;
740
2
    }
741
70
  }
742
743
1.50k
  CallEventManager &CEMgr = getStateManager().getCallEventManager();
744
1.50k
  CallEventRef<CXXDestructorCall> Call =
745
1.50k
      CEMgr.getCXXDestructorCall(DtorDecl, S, Dest, IsBaseDtor, State, LCtx);
746
747
1.50k
  PrettyStackTraceLoc CrashInfo(getContext().getSourceManager(),
748
1.50k
                                Call->getSourceRange().getBegin(),
749
1.50k
                                "Error evaluating destructor");
750
751
1.50k
  ExplodedNodeSet DstPreCall;
752
1.50k
  getCheckerManager().runCheckersForPreCall(DstPreCall, Pred,
753
1.50k
                                            *Call, *this);
754
755
1.50k
  ExplodedNodeSet DstInvalidated;
756
1.50k
  StmtNodeBuilder Bldr(DstPreCall, DstInvalidated, *currBldrCtx);
757
1.50k
  for (ExplodedNodeSet::iterator I = DstPreCall.begin(), E = DstPreCall.end();
758
2.99k
       I != E; 
++I1.49k
)
759
1.49k
    defaultEvalCall(Bldr, *I, *Call, CallOpts);
760
761
1.50k
  getCheckerManager().runCheckersForPostCall(Dst, DstInvalidated,
762
1.50k
                                             *Call, *this);
763
1.50k
}
764
765
void ExprEngine::VisitCXXNewAllocatorCall(const CXXNewExpr *CNE,
766
                                          ExplodedNode *Pred,
767
1.02k
                                          ExplodedNodeSet &Dst) {
768
1.02k
  ProgramStateRef State = Pred->getState();
769
1.02k
  const LocationContext *LCtx = Pred->getLocationContext();
770
1.02k
  PrettyStackTraceLoc CrashInfo(getContext().getSourceManager(),
771
1.02k
                                CNE->getBeginLoc(),
772
1.02k
                                "Error evaluating New Allocator Call");
773
1.02k
  CallEventManager &CEMgr = getStateManager().getCallEventManager();
774
1.02k
  CallEventRef<CXXAllocatorCall> Call =
775
1.02k
    CEMgr.getCXXAllocatorCall(CNE, State, LCtx);
776
777
1.02k
  ExplodedNodeSet DstPreCall;
778
1.02k
  getCheckerManager().runCheckersForPreCall(DstPreCall, Pred,
779
1.02k
                                            *Call, *this);
780
781
1.02k
  ExplodedNodeSet DstPostCall;
782
1.02k
  StmtNodeBuilder CallBldr(DstPreCall, DstPostCall, *currBldrCtx);
783
1.01k
  for (ExplodedNode *I : DstPreCall) {
784
    // FIXME: Provide evalCall for checkers?
785
1.01k
    defaultEvalCall(CallBldr, I, *Call);
786
1.01k
  }
787
  // If the call is inlined, DstPostCall will be empty and we bail out now.
788
789
  // Store return value of operator new() for future use, until the actual
790
  // CXXNewExpr gets processed.
791
1.02k
  ExplodedNodeSet DstPostValue;
792
1.02k
  StmtNodeBuilder ValueBldr(DstPostCall, DstPostValue, *currBldrCtx);
793
652
  for (ExplodedNode *I : DstPostCall) {
794
    // FIXME: Because CNE serves as the "call site" for the allocator (due to
795
    // lack of a better expression in the AST), the conjured return value symbol
796
    // is going to be of the same type (C++ object pointer type). Technically
797
    // this is not correct because the operator new's prototype always says that
798
    // it returns a 'void *'. So we should change the type of the symbol,
799
    // and then evaluate the cast over the symbolic pointer from 'void *' to
800
    // the object pointer type. But without changing the symbol's type it
801
    // is breaking too much to evaluate the no-op symbolic cast over it, so we
802
    // skip it for now.
803
652
    ProgramStateRef State = I->getState();
804
652
    SVal RetVal = State->getSVal(CNE, LCtx);
805
806
    // If this allocation function is not declared as non-throwing, failures
807
    // /must/ be signalled by exceptions, and thus the return value will never
808
    // be NULL. -fno-exceptions does not influence this semantics.
809
    // FIXME: GCC has a -fcheck-new option, which forces it to consider the case
810
    // where new can return NULL. If we end up supporting that option, we can
811
    // consider adding a check for it here.
812
    // C++11 [basic.stc.dynamic.allocation]p3.
813
652
    if (const FunctionDecl *FD = CNE->getOperatorNew()) {
814
652
      QualType Ty = FD->getType();
815
652
      if (const auto *ProtoType = Ty->getAs<FunctionProtoType>())
816
652
        if (!ProtoType->isNothrow())
817
628
          State = State->assume(RetVal.castAs<DefinedOrUnknownSVal>(), true);
818
652
    }
819
820
652
    ValueBldr.generateNode(
821
652
        CNE, I, addObjectUnderConstruction(State, CNE, LCtx, RetVal));
822
652
  }
823
824
1.02k
  ExplodedNodeSet DstPostPostCallCallback;
825
1.02k
  getCheckerManager().runCheckersForPostCall(DstPostPostCallCallback,
826
1.02k
                                             DstPostValue, *Call, *this);
827
652
  for (ExplodedNode *I : DstPostPostCallCallback) {
828
652
    getCheckerManager().runCheckersForNewAllocator(*Call, Dst, I, *this);
829
652
  }
830
1.02k
}
831
832
void ExprEngine::VisitCXXNewExpr(const CXXNewExpr *CNE, ExplodedNode *Pred,
833
994
                                   ExplodedNodeSet &Dst) {
834
  // FIXME: Much of this should eventually migrate to CXXAllocatorCall.
835
  // Also, we need to decide how allocators actually work -- they're not
836
  // really part of the CXXNewExpr because they happen BEFORE the
837
  // CXXConstructExpr subexpression. See PR12014 for some discussion.
838
839
994
  unsigned blockCount = currBldrCtx->blockCount();
840
994
  const LocationContext *LCtx = Pred->getLocationContext();
841
994
  SVal symVal = UnknownVal();
842
994
  FunctionDecl *FD = CNE->getOperatorNew();
843
844
994
  bool IsStandardGlobalOpNewFunction =
845
994
      FD->isReplaceableGlobalAllocationFunction();
846
847
994
  ProgramStateRef State = Pred->getState();
848
849
  // Retrieve the stored operator new() return value.
850
994
  if (AMgr.getAnalyzerOptions().MayInlineCXXAllocator) {
851
987
    symVal = *getObjectUnderConstruction(State, CNE, LCtx);
852
987
    State = finishObjectConstruction(State, CNE, LCtx);
853
987
  }
854
855
  // We assume all standard global 'operator new' functions allocate memory in
856
  // heap. We realize this is an approximation that might not correctly model
857
  // a custom global allocator.
858
994
  if (symVal.isUnknown()) {
859
7
    if (IsStandardGlobalOpNewFunction)
860
5
      symVal = svalBuilder.getConjuredHeapSymbolVal(CNE, LCtx, blockCount);
861
2
    else
862
2
      symVal = svalBuilder.conjureSymbolVal(nullptr, CNE, LCtx, CNE->getType(),
863
2
                                            blockCount);
864
7
  }
865
866
994
  CallEventManager &CEMgr = getStateManager().getCallEventManager();
867
994
  CallEventRef<CXXAllocatorCall> Call =
868
994
    CEMgr.getCXXAllocatorCall(CNE, State, LCtx);
869
870
994
  if (!AMgr.getAnalyzerOptions().MayInlineCXXAllocator) {
871
    // Invalidate placement args.
872
    // FIXME: Once we figure out how we want allocators to work,
873
    // we should be using the usual pre-/(default-)eval-/post-call checkers
874
    // here.
875
7
    State = Call->invalidateRegions(blockCount);
876
7
    if (!State)
877
0
      return;
878
879
    // If this allocation function is not declared as non-throwing, failures
880
    // /must/ be signalled by exceptions, and thus the return value will never
881
    // be NULL. -fno-exceptions does not influence this semantics.
882
    // FIXME: GCC has a -fcheck-new option, which forces it to consider the case
883
    // where new can return NULL. If we end up supporting that option, we can
884
    // consider adding a check for it here.
885
    // C++11 [basic.stc.dynamic.allocation]p3.
886
7
    if (FD) {
887
7
      QualType Ty = FD->getType();
888
7
      if (const auto *ProtoType = Ty->getAs<FunctionProtoType>())
889
7
        if (!ProtoType->isNothrow())
890
3
          if (auto dSymVal = symVal.getAs<DefinedOrUnknownSVal>())
891
3
            State = State->assume(*dSymVal, true);
892
7
    }
893
7
  }
894
895
994
  StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx);
896
897
994
  SVal Result = symVal;
898
899
994
  if (CNE->isArray()) {
900
    // FIXME: allocating an array requires simulating the constructors.
901
    // For now, just return a symbolicated region.
902
126
    if (const auto *NewReg = cast_or_null<SubRegion>(symVal.getAsRegion())) {
903
121
      QualType ObjTy = CNE->getType()->getPointeeType();
904
121
      const ElementRegion *EleReg =
905
121
          getStoreManager().GetElementZeroRegion(NewReg, ObjTy);
906
121
      Result = loc::MemRegionVal(EleReg);
907
121
    }
908
126
    State = State->BindExpr(CNE, Pred->getLocationContext(), Result);
909
126
    Bldr.generateNode(CNE, Pred, State);
910
126
    return;
911
126
  }
912
913
  // FIXME: Once we have proper support for CXXConstructExprs inside
914
  // CXXNewExpr, we need to make sure that the constructed object is not
915
  // immediately invalidated here. (The placement call should happen before
916
  // the constructor call anyway.)
917
868
  if (FD && FD->isReservedGlobalPlacementOperator()) {
918
    // Non-array placement new should always return the placement location.
919
295
    SVal PlacementLoc = State->getSVal(CNE->getPlacementArg(0), LCtx);
920
295
    Result = svalBuilder.evalCast(PlacementLoc, CNE->getType(),
921
295
                                  CNE->getPlacementArg(0)->getType());
922
295
  }
923
924
  // Bind the address of the object, then check to see if we cached out.
925
868
  State = State->BindExpr(CNE, LCtx, Result);
926
868
  ExplodedNode *NewN = Bldr.generateNode(CNE, Pred, State);
927
868
  if (!NewN)
928
0
    return;
929
930
  // If the type is not a record, we won't have a CXXConstructExpr as an
931
  // initializer. Copy the value over.
932
868
  if (const Expr *Init = CNE->getInitializer()) {
933
618
    if (!isa<CXXConstructExpr>(Init)) {
934
175
      assert(Bldr.getResults().size() == 1);
935
0
      Bldr.takeNodes(NewN);
936
175
      evalBind(Dst, CNE, NewN, Result, State->getSVal(Init, LCtx),
937
175
               /*FirstInit=*/IsStandardGlobalOpNewFunction);
938
175
    }
939
618
  }
940
868
}
941
942
void ExprEngine::VisitCXXDeleteExpr(const CXXDeleteExpr *CDE,
943
436
                                    ExplodedNode *Pred, ExplodedNodeSet &Dst) {
944
945
436
  CallEventManager &CEMgr = getStateManager().getCallEventManager();
946
436
  CallEventRef<CXXDeallocatorCall> Call = CEMgr.getCXXDeallocatorCall(
947
436
      CDE, Pred->getState(), Pred->getLocationContext());
948
949
436
  ExplodedNodeSet DstPreCall;
950
436
  getCheckerManager().runCheckersForPreCall(DstPreCall, Pred, *Call, *this);
951
952
436
  getCheckerManager().runCheckersForPostCall(Dst, DstPreCall, *Call, *this);
953
436
}
954
955
void ExprEngine::VisitCXXCatchStmt(const CXXCatchStmt *CS, ExplodedNode *Pred,
956
0
                                   ExplodedNodeSet &Dst) {
957
0
  const VarDecl *VD = CS->getExceptionDecl();
958
0
  if (!VD) {
959
0
    Dst.Add(Pred);
960
0
    return;
961
0
  }
962
963
0
  const LocationContext *LCtx = Pred->getLocationContext();
964
0
  SVal V = svalBuilder.conjureSymbolVal(CS, LCtx, VD->getType(),
965
0
                                        currBldrCtx->blockCount());
966
0
  ProgramStateRef state = Pred->getState();
967
0
  state = state->bindLoc(state->getLValue(VD, LCtx), V, LCtx);
968
969
0
  StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx);
970
0
  Bldr.generateNode(CS, Pred, state);
971
0
}
972
973
void ExprEngine::VisitCXXThisExpr(const CXXThisExpr *TE, ExplodedNode *Pred,
974
9.57k
                                    ExplodedNodeSet &Dst) {
975
9.57k
  StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx);
976
977
  // Get the this object region from StoreManager.
978
9.57k
  const LocationContext *LCtx = Pred->getLocationContext();
979
9.57k
  const MemRegion *R =
980
9.57k
    svalBuilder.getRegionManager().getCXXThisRegion(
981
9.57k
                                  getContext().getCanonicalType(TE->getType()),
982
9.57k
                                                    LCtx);
983
984
9.57k
  ProgramStateRef state = Pred->getState();
985
9.57k
  SVal V = state->getSVal(loc::MemRegionVal(R));
986
9.57k
  Bldr.generateNode(TE, Pred, state->BindExpr(TE, LCtx, V));
987
9.57k
}
988
989
void ExprEngine::VisitLambdaExpr(const LambdaExpr *LE, ExplodedNode *Pred,
990
197
                                 ExplodedNodeSet &Dst) {
991
197
  const LocationContext *LocCtxt = Pred->getLocationContext();
992
993
  // Get the region of the lambda itself.
994
197
  const MemRegion *R = svalBuilder.getRegionManager().getCXXTempObjectRegion(
995
197
      LE, LocCtxt);
996
197
  SVal V = loc::MemRegionVal(R);
997
998
197
  ProgramStateRef State = Pred->getState();
999
1000
  // If we created a new MemRegion for the lambda, we should explicitly bind
1001
  // the captures.
1002
197
  CXXRecordDecl::field_iterator CurField = LE->getLambdaClass()->field_begin();
1003
197
  for (LambdaExpr::const_capture_init_iterator i = LE->capture_init_begin(),
1004
197
                                               e = LE->capture_init_end();
1005
398
       i != e; 
++i, ++CurField201
) {
1006
201
    FieldDecl *FieldForCapture = *CurField;
1007
201
    SVal FieldLoc = State->getLValue(FieldForCapture, V);
1008
1009
201
    SVal InitVal;
1010
201
    if (!FieldForCapture->hasCapturedVLAType()) {
1011
199
      Expr *InitExpr = *i;
1012
199
      assert(InitExpr && "Capture missing initialization expression");
1013
0
      InitVal = State->getSVal(InitExpr, LocCtxt);
1014
2
    } else {
1015
      // The field stores the length of a captured variable-length array.
1016
      // These captures don't have initialization expressions; instead we
1017
      // get the length from the VLAType size expression.
1018
2
      Expr *SizeExpr = FieldForCapture->getCapturedVLAType()->getSizeExpr();
1019
2
      InitVal = State->getSVal(SizeExpr, LocCtxt);
1020
2
    }
1021
1022
0
    State = State->bindLoc(FieldLoc, InitVal, LocCtxt);
1023
201
  }
1024
1025
  // Decay the Loc into an RValue, because there might be a
1026
  // MaterializeTemporaryExpr node above this one which expects the bound value
1027
  // to be an RValue.
1028
197
  SVal LambdaRVal = State->getSVal(R);
1029
1030
197
  ExplodedNodeSet Tmp;
1031
197
  StmtNodeBuilder Bldr(Pred, Tmp, *currBldrCtx);
1032
  // FIXME: is this the right program point kind?
1033
197
  Bldr.generateNode(LE, Pred,
1034
197
                    State->BindExpr(LE, LocCtxt, LambdaRVal),
1035
197
                    nullptr, ProgramPoint::PostLValueKind);
1036
1037
  // FIXME: Move all post/pre visits to ::Visit().
1038
197
  getCheckerManager().runCheckersForPostStmt(Dst, Tmp, LE, *this);
1039
197
}