1 files changed, 0 insertions, 185 deletions
diff --git a/gnu/llvm/tools/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp b/gnu/llvm/tools/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp
deleted file mode 100644
index e458e0554ee..00000000000
--- a/gnu/llvm/tools/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp
+++ /dev/null
@@ -1,185 +0,0 @@
-//=== VLASizeChecker.cpp - Undefined dereference checker --------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This defines VLASizeChecker, a builtin check in ExprEngine that
-// performs checks for declaration of VLA of undefined or zero size.
-// In addition, VLASizeChecker is responsible for defining the extent
-// of the MemRegion that represents a VLA.
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
-#include "clang/AST/CharUnits.h"
-#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
-#include "clang/StaticAnalyzer/Core/Checker.h"
-#include "clang/StaticAnalyzer/Core/CheckerManager.h"
-#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/Support/raw_ostream.h"
-
-using namespace clang;
-using namespace ento;
-
-namespace {
-class VLASizeChecker : public Checker< check::PreStmt<DeclStmt> > {
-  mutable std::unique_ptr<BugType> BT;
-  enum VLASize_Kind { VLA_Garbage, VLA_Zero, VLA_Tainted, VLA_Negative };
-
-  void reportBug(VLASize_Kind Kind, const Expr *SizeE, ProgramStateRef State,
-                 CheckerContext &C,
-                 std::unique_ptr<BugReporterVisitor> Visitor = nullptr) const;
-
-public:
-  void checkPreStmt(const DeclStmt *DS, CheckerContext &C) const;
-};
-} // end anonymous namespace
-
-void VLASizeChecker::reportBug(
-    VLASize_Kind Kind, const Expr *SizeE, ProgramStateRef State,
-    CheckerContext &C, std::unique_ptr<BugReporterVisitor> Visitor) const {
-  // Generate an error node.
-  ExplodedNode *N = C.generateErrorNode(State);
-  if (!N)
-    return;
-
-  if (!BT)
-    BT.reset(new BuiltinBug(
-        this, "Dangerous variable-length array (VLA) declaration"));
-
-  SmallString<256> buf;
-  llvm::raw_svector_ostream os(buf);
-  os << "Declared variable-length array (VLA) ";
-  switch (Kind) {
-  case VLA_Garbage:
-    os << "uses a garbage value as its size";
-    break;
-  case VLA_Zero:
-    os << "has zero size";
-    break;
-  case VLA_Tainted:
-    os << "has tainted size";
-    break;
-  case VLA_Negative:
-    os << "has negative size";
-    break;
-  }
-
-  auto report = llvm::make_unique<BugReport>(*BT, os.str(), N);
-  report->addVisitor(std::move(Visitor));
-  report->addRange(SizeE->getSourceRange());
-  bugreporter::trackExpressionValue(N, SizeE, *report);
-  C.emitReport(std::move(report));
-}
-
-void VLASizeChecker::checkPreStmt(const DeclStmt *DS, CheckerContext &C) const {
-  if (!DS->isSingleDecl())
-    return;
-
-  const VarDecl *VD = dyn_cast<VarDecl>(DS->getSingleDecl());
-  if (!VD)
-    return;
-
-  ASTContext &Ctx = C.getASTContext();
-  const VariableArrayType *VLA = Ctx.getAsVariableArrayType(VD->getType());
-  if (!VLA)
-    return;
-
-  // FIXME: Handle multi-dimensional VLAs.
-  const Expr *SE = VLA->getSizeExpr();
-  ProgramStateRef state = C.getState();
-  SVal sizeV = C.getSVal(SE);
-
-  if (sizeV.isUndef()) {
-    reportBug(VLA_Garbage, SE, state, C);
-    return;
-  }
-
-  // See if the size value is known. It can't be undefined because we would have
-  // warned about that already.
-  if (sizeV.isUnknown())
-    return;
-
-  // Check if the size is tainted.
-  if (state->isTainted(sizeV)) {
-    reportBug(VLA_Tainted, SE, nullptr, C,
-              llvm::make_unique<TaintBugVisitor>(sizeV));
-    return;
-  }
-
-  // Check if the size is zero.
-  DefinedSVal sizeD = sizeV.castAs<DefinedSVal>();
-
-  ProgramStateRef stateNotZero, stateZero;
-  std::tie(stateNotZero, stateZero) = state->assume(sizeD);
-
-  if (stateZero && !stateNotZero) {
-    reportBug(VLA_Zero, SE, stateZero, C);
-    return;
-  }
-
-  // From this point on, assume that the size is not zero.
-  state = stateNotZero;
-
-  // VLASizeChecker is responsible for defining the extent of the array being
-  // declared. We do this by multiplying the array length by the element size,
-  // then matching that with the array region's extent symbol.
-
-  // Check if the size is negative.
-  SValBuilder &svalBuilder = C.getSValBuilder();
-
-  QualType Ty = SE->getType();
-  DefinedOrUnknownSVal Zero = svalBuilder.makeZeroVal(Ty);
-
-  SVal LessThanZeroVal = svalBuilder.evalBinOp(state, BO_LT, sizeD, Zero, Ty);
-  if (Optional<DefinedSVal> LessThanZeroDVal =
-        LessThanZeroVal.getAs<DefinedSVal>()) {
-    ConstraintManager &CM = C.getConstraintManager();
-    ProgramStateRef StatePos, StateNeg;
-
-    std::tie(StateNeg, StatePos) = CM.assumeDual(state, *LessThanZeroDVal);
-    if (StateNeg && !StatePos) {
-      reportBug(VLA_Negative, SE, state, C);
-      return;
-    }
-    state = StatePos;
-  }
-
-  // Convert the array length to size_t.
-  QualType SizeTy = Ctx.getSizeType();
-  NonLoc ArrayLength =
-      svalBuilder.evalCast(sizeD, SizeTy, SE->getType()).castAs<NonLoc>();
-
-  // Get the element size.
-  CharUnits EleSize = Ctx.getTypeSizeInChars(VLA->getElementType());
-  SVal EleSizeVal = svalBuilder.makeIntVal(EleSize.getQuantity(), SizeTy);
-
-  // Multiply the array length by the element size.
-  SVal ArraySizeVal = svalBuilder.evalBinOpNN(
-      state, BO_Mul, ArrayLength, EleSizeVal.castAs<NonLoc>(), SizeTy);
-
-  // Finally, assume that the array's extent matches the given size.
-  const LocationContext *LC = C.getLocationContext();
-  DefinedOrUnknownSVal Extent =
-    state->getRegion(VD, LC)->getExtent(svalBuilder);
-  DefinedOrUnknownSVal ArraySize = ArraySizeVal.castAs<DefinedOrUnknownSVal>();
-  DefinedOrUnknownSVal sizeIsKnown =
-    svalBuilder.evalEQ(state, Extent, ArraySize);
-  state = state->assume(sizeIsKnown, true);
-
-  // Assume should not fail at this point.
-  assert(state);
-
-  // Remember our assumptions!
-  C.addTransition(state);
-}
-
-void ento::registerVLASizeChecker(CheckerManager &mgr) {
-  mgr.registerChecker<VLASizeChecker>();
-}