Remove LLVM 8.0.1 files.

1 files changed, 0 insertions, 306 deletions

diff --git a/gnu/llvm/tools/clang/lib/StaticAnalyzer/Checkers/DereferenceChecker.cpp b/gnu/llvm/tools/clang/lib/StaticAnalyzer/Checkers/DereferenceChecker.cpp
deleted file mode 100644
index d01a889d256..00000000000
--- a/gnu/llvm/tools/clang/lib/StaticAnalyzer/Checkers/DereferenceChecker.cpp
+++ /dev/null
@@ -1,306 +0,0 @@
-//== NullDerefChecker.cpp - Null 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 NullDerefChecker, a builtin check in ExprEngine that performs
-// checks for null pointers at loads and stores.
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
-#include "clang/AST/ExprObjC.h"
-#include "clang/AST/ExprOpenMP.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 "clang/StaticAnalyzer/Core/PathSensitive/CheckerHelpers.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/Support/raw_ostream.h"
-
-using namespace clang;
-using namespace ento;
-
-namespace {
-class DereferenceChecker
-    : public Checker< check::Location,
-                      check::Bind,
-                      EventDispatcher<ImplicitNullDerefEvent> > {
-  mutable std::unique_ptr<BuiltinBug> BT_null;
-  mutable std::unique_ptr<BuiltinBug> BT_undef;
-
-  void reportBug(ProgramStateRef State, const Stmt *S, CheckerContext &C) const;
-
-public:
-  void checkLocation(SVal location, bool isLoad, const Stmt* S,
-                     CheckerContext &C) const;
-  void checkBind(SVal L, SVal V, const Stmt *S, CheckerContext &C) const;
-
-  static void AddDerefSource(raw_ostream &os,
-                             SmallVectorImpl<SourceRange> &Ranges,
-                             const Expr *Ex, const ProgramState *state,
-                             const LocationContext *LCtx,
-                             bool loadedFrom = false);
-};
-} // end anonymous namespace
-
-void
-DereferenceChecker::AddDerefSource(raw_ostream &os,
-                                   SmallVectorImpl<SourceRange> &Ranges,
-                                   const Expr *Ex,
-                                   const ProgramState *state,
-                                   const LocationContext *LCtx,
-                                   bool loadedFrom) {
-  Ex = Ex->IgnoreParenLValueCasts();
-  switch (Ex->getStmtClass()) {
-    default:
-      break;
-    case Stmt::DeclRefExprClass: {
-      const DeclRefExpr *DR = cast<DeclRefExpr>(Ex);
-      if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) {
-        os << " (" << (loadedFrom ? "loaded from" : "from")
-           << " variable '" <<  VD->getName() << "')";
-        Ranges.push_back(DR->getSourceRange());
-      }
-      break;
-    }
-    case Stmt::MemberExprClass: {
-      const MemberExpr *ME = cast<MemberExpr>(Ex);
-      os << " (" << (loadedFrom ? "loaded from" : "via")
-         << " field '" << ME->getMemberNameInfo() << "')";
-      SourceLocation L = ME->getMemberLoc();
-      Ranges.push_back(SourceRange(L, L));
-      break;
-    }
-    case Stmt::ObjCIvarRefExprClass: {
-      const ObjCIvarRefExpr *IV = cast<ObjCIvarRefExpr>(Ex);
-      os << " (" << (loadedFrom ? "loaded from" : "via")
-         << " ivar '" << IV->getDecl()->getName() << "')";
-      SourceLocation L = IV->getLocation();
-      Ranges.push_back(SourceRange(L, L));
-      break;
-    }
-  }
-}
-
-static const Expr *getDereferenceExpr(const Stmt *S, bool IsBind=false){
-  const Expr *E = nullptr;
-
-  // Walk through lvalue casts to get the original expression
-  // that syntactically caused the load.
-  if (const Expr *expr = dyn_cast<Expr>(S))
-    E = expr->IgnoreParenLValueCasts();
-
-  if (IsBind) {
-    const VarDecl *VD;
-    const Expr *Init;
-    std::tie(VD, Init) = parseAssignment(S);
-    if (VD && Init)
-      E = Init;
-  }
-  return E;
-}
-
-static bool suppressReport(const Expr *E) {
-  // Do not report dereferences on memory in non-default address spaces.
-  return E->getType().getQualifiers().hasAddressSpace();
-}
-
-static bool isDeclRefExprToReference(const Expr *E) {
-  if (const auto *DRE = dyn_cast<DeclRefExpr>(E))
-    return DRE->getDecl()->getType()->isReferenceType();
-  return false;
-}
-
-void DereferenceChecker::reportBug(ProgramStateRef State, const Stmt *S,
-                                   CheckerContext &C) const {
-  // Generate an error node.
-  ExplodedNode *N = C.generateErrorNode(State);
-  if (!N)
-    return;
-
-  // We know that 'location' cannot be non-null.  This is what
-  // we call an "explicit" null dereference.
-  if (!BT_null)
-    BT_null.reset(new BuiltinBug(this, "Dereference of null pointer"));
-
-  SmallString<100> buf;
-  llvm::raw_svector_ostream os(buf);
-
-  SmallVector<SourceRange, 2> Ranges;
-
-  switch (S->getStmtClass()) {
-  case Stmt::ArraySubscriptExprClass: {
-    os << "Array access";
-    const ArraySubscriptExpr *AE = cast<ArraySubscriptExpr>(S);
-    AddDerefSource(os, Ranges, AE->getBase()->IgnoreParenCasts(),
-                   State.get(), N->getLocationContext());
-    os << " results in a null pointer dereference";
-    break;
-  }
-  case Stmt::OMPArraySectionExprClass: {
-    os << "Array access";
-    const OMPArraySectionExpr *AE = cast<OMPArraySectionExpr>(S);
-    AddDerefSource(os, Ranges, AE->getBase()->IgnoreParenCasts(),
-                   State.get(), N->getLocationContext());
-    os << " results in a null pointer dereference";
-    break;
-  }
-  case Stmt::UnaryOperatorClass: {
-    os << "Dereference of null pointer";
-    const UnaryOperator *U = cast<UnaryOperator>(S);
-    AddDerefSource(os, Ranges, U->getSubExpr()->IgnoreParens(),
-                   State.get(), N->getLocationContext(), true);
-    break;
-  }
-  case Stmt::MemberExprClass: {
-    const MemberExpr *M = cast<MemberExpr>(S);
-    if (M->isArrow() || isDeclRefExprToReference(M->getBase())) {
-      os << "Access to field '" << M->getMemberNameInfo()
-         << "' results in a dereference of a null pointer";
-      AddDerefSource(os, Ranges, M->getBase()->IgnoreParenCasts(),
-                     State.get(), N->getLocationContext(), true);
-    }
-    break;
-  }
-  case Stmt::ObjCIvarRefExprClass: {
-    const ObjCIvarRefExpr *IV = cast<ObjCIvarRefExpr>(S);
-    os << "Access to instance variable '" << *IV->getDecl()
-       << "' results in a dereference of a null pointer";
-    AddDerefSource(os, Ranges, IV->getBase()->IgnoreParenCasts(),
-                   State.get(), N->getLocationContext(), true);
-    break;
-  }
-  default:
-    break;
-  }
-
-  auto report = llvm::make_unique<BugReport>(
-      *BT_null, buf.empty() ? BT_null->getDescription() : StringRef(buf), N);
-
-  bugreporter::trackExpressionValue(N, bugreporter::getDerefExpr(S), *report);
-
-  for (SmallVectorImpl<SourceRange>::iterator
-       I = Ranges.begin(), E = Ranges.end(); I!=E; ++I)
-    report->addRange(*I);
-
-  C.emitReport(std::move(report));
-}
-
-void DereferenceChecker::checkLocation(SVal l, bool isLoad, const Stmt* S,
-                                       CheckerContext &C) const {
-  // Check for dereference of an undefined value.
-  if (l.isUndef()) {
-    if (ExplodedNode *N = C.generateErrorNode()) {
-      if (!BT_undef)
-        BT_undef.reset(
-            new BuiltinBug(this, "Dereference of undefined pointer value"));
-
-      auto report =
-          llvm::make_unique<BugReport>(*BT_undef, BT_undef->getDescription(), N);
-      bugreporter::trackExpressionValue(N, bugreporter::getDerefExpr(S), *report);
-      C.emitReport(std::move(report));
-    }
-    return;
-  }
-
-  DefinedOrUnknownSVal location = l.castAs<DefinedOrUnknownSVal>();
-
-  // Check for null dereferences.
-  if (!location.getAs<Loc>())
-    return;
-
-  ProgramStateRef state = C.getState();
-
-  ProgramStateRef notNullState, nullState;
-  std::tie(notNullState, nullState) = state->assume(location);
-
-  // The explicit NULL case.
-  if (nullState) {
-    if (!notNullState) {
-      const Expr *expr = getDereferenceExpr(S);
-      if (!suppressReport(expr)) {
-        reportBug(nullState, expr, C);
-        return;
-      }
-    }
-
-    // Otherwise, we have the case where the location could either be
-    // null or not-null.  Record the error node as an "implicit" null
-    // dereference.
-    if (ExplodedNode *N = C.generateSink(nullState, C.getPredecessor())) {
-      ImplicitNullDerefEvent event = {l, isLoad, N, &C.getBugReporter(),
-                                      /*IsDirectDereference=*/true};
-      dispatchEvent(event);
-    }
-  }
-
-  // From this point forward, we know that the location is not null.
-  C.addTransition(notNullState);
-}
-
-void DereferenceChecker::checkBind(SVal L, SVal V, const Stmt *S,
-                                   CheckerContext &C) const {
-  // If we're binding to a reference, check if the value is known to be null.
-  if (V.isUndef())
-    return;
-
-  const MemRegion *MR = L.getAsRegion();
-  const TypedValueRegion *TVR = dyn_cast_or_null<TypedValueRegion>(MR);
-  if (!TVR)
-    return;
-
-  if (!TVR->getValueType()->isReferenceType())
-    return;
-
-  ProgramStateRef State = C.getState();
-
-  ProgramStateRef StNonNull, StNull;
-  std::tie(StNonNull, StNull) = State->assume(V.castAs<DefinedOrUnknownSVal>());
-
-  if (StNull) {
-    if (!StNonNull) {
-      const Expr *expr = getDereferenceExpr(S, /*IsBind=*/true);
-      if (!suppressReport(expr)) {
-        reportBug(StNull, expr, C);
-        return;
-      }
-    }
-
-    // At this point the value could be either null or non-null.
-    // Record this as an "implicit" null dereference.
-    if (ExplodedNode *N = C.generateSink(StNull, C.getPredecessor())) {
-      ImplicitNullDerefEvent event = {V, /*isLoad=*/true, N,
-                                      &C.getBugReporter(),
-                                      /*IsDirectDereference=*/true};
-      dispatchEvent(event);
-    }
-  }
-
-  // Unlike a regular null dereference, initializing a reference with a
-  // dereferenced null pointer does not actually cause a runtime exception in
-  // Clang's implementation of references.
-  //
-  //   int &r = *p; // safe??
-  //   if (p != NULL) return; // uh-oh
-  //   r = 5; // trap here
-  //
-  // The standard says this is invalid as soon as we try to create a "null
-  // reference" (there is no such thing), but turning this into an assumption
-  // that 'p' is never null will not match our actual runtime behavior.
-  // So we do not record this assumption, allowing us to warn on the last line
-  // of this example.
-  //
-  // We do need to add a transition because we may have generated a sink for
-  // the "implicit" null dereference.
-  C.addTransition(State, this);
-}
-
-void ento::registerDereferenceChecker(CheckerManager &mgr) {
-  mgr.registerChecker<DereferenceChecker>();
-}