1 files changed, 0 insertions, 191 deletions
diff --git a/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp b/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp
deleted file mode 100644
index a2f3e0da13fb0..0000000000000
--- a/lib/StaticAnalyzer/Checkers/UndefResultChecker.cpp
+++ /dev/null
@@ -1,191 +0,0 @@
-//=== UndefResultChecker.cpp ------------------------------------*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This defines UndefResultChecker, a builtin check in ExprEngine that
-// performs checks for undefined results of non-assignment binary operators.
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.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/ExprEngine.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/Support/raw_ostream.h"
-
-using namespace clang;
-using namespace ento;
-
-namespace {
-class UndefResultChecker
-  : public Checker< check::PostStmt<BinaryOperator> > {
-
-  mutable std::unique_ptr<BugType> BT;
-
-public:
-  void checkPostStmt(const BinaryOperator *B, CheckerContext &C) const;
-};
-} // end anonymous namespace
-
-static bool isArrayIndexOutOfBounds(CheckerContext &C, const Expr *Ex) {
-  ProgramStateRef state = C.getState();
-
-  if (!isa<ArraySubscriptExpr>(Ex))
-    return false;
-
-  SVal Loc = C.getSVal(Ex);
-  if (!Loc.isValid())
-    return false;
-
-  const MemRegion *MR = Loc.castAs<loc::MemRegionVal>().getRegion();
-  const ElementRegion *ER = dyn_cast<ElementRegion>(MR);
-  if (!ER)
-    return false;
-
-  DefinedOrUnknownSVal Idx = ER->getIndex().castAs<DefinedOrUnknownSVal>();
-  DefinedOrUnknownSVal NumElements = C.getStoreManager().getSizeInElements(
-      state, ER->getSuperRegion(), ER->getValueType());
-  ProgramStateRef StInBound = state->assumeInBound(Idx, NumElements, true);
-  ProgramStateRef StOutBound = state->assumeInBound(Idx, NumElements, false);
-  return StOutBound && !StInBound;
-}
-
-static bool isShiftOverflow(const BinaryOperator *B, CheckerContext &C) {
-  return C.isGreaterOrEqual(
-      B->getRHS(), C.getASTContext().getIntWidth(B->getLHS()->getType()));
-}
-
-static bool isLeftShiftResultUnrepresentable(const BinaryOperator *B,
-                                             CheckerContext &C) {
-  SValBuilder &SB = C.getSValBuilder();
-  ProgramStateRef State = C.getState();
-  const llvm::APSInt *LHS = SB.getKnownValue(State, C.getSVal(B->getLHS()));
-  const llvm::APSInt *RHS = SB.getKnownValue(State, C.getSVal(B->getRHS()));
-  assert(LHS && RHS && "Values unknown, inconsistent state");
-  return (unsigned)RHS->getZExtValue() > LHS->countLeadingZeros();
-}
-
-void UndefResultChecker::checkPostStmt(const BinaryOperator *B,
-                                       CheckerContext &C) const {
-  if (C.getSVal(B).isUndef()) {
-
-    // Do not report assignments of uninitialized values inside swap functions.
-    // This should allow to swap partially uninitialized structs
-    // (radar://14129997)
-    if (const FunctionDecl *EnclosingFunctionDecl =
-        dyn_cast<FunctionDecl>(C.getStackFrame()->getDecl()))
-      if (C.getCalleeName(EnclosingFunctionDecl) == "swap")
-        return;
-
-    // Generate an error node.
-    ExplodedNode *N = C.generateErrorNode();
-    if (!N)
-      return;
-
-    if (!BT)
-      BT.reset(
-          new BuiltinBug(this, "Result of operation is garbage or undefined"));
-
-    SmallString<256> sbuf;
-    llvm::raw_svector_ostream OS(sbuf);
-    const Expr *Ex = nullptr;
-    bool isLeft = true;
-
-    if (C.getSVal(B->getLHS()).isUndef()) {
-      Ex = B->getLHS()->IgnoreParenCasts();
-      isLeft = true;
-    }
-    else if (C.getSVal(B->getRHS()).isUndef()) {
-      Ex = B->getRHS()->IgnoreParenCasts();
-      isLeft = false;
-    }
-
-    if (Ex) {
-      OS << "The " << (isLeft ? "left" : "right") << " operand of '"
-         << BinaryOperator::getOpcodeStr(B->getOpcode())
-         << "' is a garbage value";
-      if (isArrayIndexOutOfBounds(C, Ex))
-        OS << " due to array index out of bounds";
-    } else {
-      // Neither operand was undefined, but the result is undefined.
-      if ((B->getOpcode() == BinaryOperatorKind::BO_Shl ||
-           B->getOpcode() == BinaryOperatorKind::BO_Shr) &&
-          C.isNegative(B->getRHS())) {
-        OS << "The result of the "
-           << ((B->getOpcode() == BinaryOperatorKind::BO_Shl) ? "left"
-                                                              : "right")
-           << " shift is undefined because the right operand is negative";
-        Ex = B->getRHS();
-      } else if ((B->getOpcode() == BinaryOperatorKind::BO_Shl ||
-                  B->getOpcode() == BinaryOperatorKind::BO_Shr) &&
-                 isShiftOverflow(B, C)) {
-
-        OS << "The result of the "
-           << ((B->getOpcode() == BinaryOperatorKind::BO_Shl) ? "left"
-                                                              : "right")
-           << " shift is undefined due to shifting by ";
-        Ex = B->getRHS();
-
-        SValBuilder &SB = C.getSValBuilder();
-        const llvm::APSInt *I =
-            SB.getKnownValue(C.getState(), C.getSVal(B->getRHS()));
-        if (!I)
-          OS << "a value that is";
-        else if (I->isUnsigned())
-          OS << '\'' << I->getZExtValue() << "\', which is";
-        else
-          OS << '\'' << I->getSExtValue() << "\', which is";
-
-        OS << " greater or equal to the width of type '"
-           << B->getLHS()->getType().getAsString() << "'.";
-      } else if (B->getOpcode() == BinaryOperatorKind::BO_Shl &&
-                 C.isNegative(B->getLHS())) {
-        OS << "The result of the left shift is undefined because the left "
-              "operand is negative";
-        Ex = B->getLHS();
-      } else if (B->getOpcode() == BinaryOperatorKind::BO_Shl &&
-                 isLeftShiftResultUnrepresentable(B, C)) {
-        ProgramStateRef State = C.getState();
-        SValBuilder &SB = C.getSValBuilder();
-        const llvm::APSInt *LHS =
-            SB.getKnownValue(State, C.getSVal(B->getLHS()));
-        const llvm::APSInt *RHS =
-            SB.getKnownValue(State, C.getSVal(B->getRHS()));
-        OS << "The result of the left shift is undefined due to shifting \'"
-           << LHS->getSExtValue() << "\' by \'" << RHS->getZExtValue()
-           << "\', which is unrepresentable in the unsigned version of "
-           << "the return type \'" << B->getLHS()->getType().getAsString()
-           << "\'";
-        Ex = B->getLHS();
-      } else {
-        OS << "The result of the '"
-           << BinaryOperator::getOpcodeStr(B->getOpcode())
-           << "' expression is undefined";
-      }
-    }
-    auto report = std::make_unique<PathSensitiveBugReport>(*BT, OS.str(), N);
-    if (Ex) {
-      report->addRange(Ex->getSourceRange());
-      bugreporter::trackExpressionValue(N, Ex, *report);
-    }
-    else
-      bugreporter::trackExpressionValue(N, B, *report);
-
-    C.emitReport(std::move(report));
-  }
-}
-
-void ento::registerUndefResultChecker(CheckerManager &mgr) {
-  mgr.registerChecker<UndefResultChecker>();
-}
-
-bool ento::shouldRegisterUndefResultChecker(const LangOptions &LO) {
-  return true;
-}