0f1c1be196
We have a new policy in place making links to private resources something we try to avoid in source and test files. Normally, we'd organically switch to the new policy rather than make a sweeping change across a project. However, Clang is in a somewhat special circumstance currently: recently, I've had several new contributors run into rdar links around test code which their patch was changing the behavior of. This turns out to be a surprisingly bad experience, especially for newer folks, for a handful of reasons: not understanding what the link is and feeling intimidated by it, wondering whether their changes are actually breaking something important to a downstream in some way, having to hunt down strangers not involved with the patch to impose on them for help, accidental pressure from asking for potentially private IP to be made public, etc. Because folks run into these links entirely by chance (through fixing bugs or working on new features), there's not really a set of problematic links to focus on -- all of the links have basically the same potential for causing these problems. As a result, this is an omnibus patch to remove all such links. This was not a mechanical change; it was done by manually searching for rdar, radar, radr, and other variants to find all the various problematic links. From there, I tried to retain or reword the surrounding comments so that we would lose as little context as possible. However, because most links were just a plain link with no supporting context, the majority of the changes are simple removals. Differential Review: https://reviews.llvm.org/D158071
125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
//===--- UndefinedAssignmentChecker.h ---------------------------*- C++ -*--==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This defines UndefinedAssignmentChecker, a builtin check in ExprEngine that
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// checks for assigning undefined values.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
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#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
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#include "clang/StaticAnalyzer/Core/Checker.h"
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#include "clang/StaticAnalyzer/Core/CheckerManager.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
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using namespace clang;
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using namespace ento;
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namespace {
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class UndefinedAssignmentChecker
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: public Checker<check::Bind> {
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mutable std::unique_ptr<BugType> BT;
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public:
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void checkBind(SVal location, SVal val, const Stmt *S,
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CheckerContext &C) const;
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};
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}
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void UndefinedAssignmentChecker::checkBind(SVal location, SVal val,
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const Stmt *StoreE,
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CheckerContext &C) const {
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if (!val.isUndef())
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return;
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// Do not report assignments of uninitialized values inside swap functions.
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// This should allow to swap partially uninitialized structs
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if (const FunctionDecl *EnclosingFunctionDecl =
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dyn_cast<FunctionDecl>(C.getStackFrame()->getDecl()))
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if (C.getCalleeName(EnclosingFunctionDecl) == "swap")
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return;
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ExplodedNode *N = C.generateErrorNode();
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if (!N)
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return;
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static const char *const DefaultMsg =
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"Assigned value is garbage or undefined";
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if (!BT)
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BT.reset(new BugType(this, DefaultMsg));
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// Generate a report for this bug.
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llvm::SmallString<128> Str;
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llvm::raw_svector_ostream OS(Str);
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const Expr *ex = nullptr;
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while (StoreE) {
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if (const UnaryOperator *U = dyn_cast<UnaryOperator>(StoreE)) {
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OS << "The expression is an uninitialized value. "
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"The computed value will also be garbage";
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ex = U->getSubExpr();
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break;
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}
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if (const BinaryOperator *B = dyn_cast<BinaryOperator>(StoreE)) {
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if (B->isCompoundAssignmentOp()) {
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if (C.getSVal(B->getLHS()).isUndef()) {
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OS << "The left expression of the compound assignment is an "
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"uninitialized value. The computed value will also be garbage";
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ex = B->getLHS();
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break;
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}
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}
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ex = B->getRHS();
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break;
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}
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if (const DeclStmt *DS = dyn_cast<DeclStmt>(StoreE)) {
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const VarDecl *VD = cast<VarDecl>(DS->getSingleDecl());
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ex = VD->getInit();
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}
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if (const auto *CD =
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dyn_cast<CXXConstructorDecl>(C.getStackFrame()->getDecl())) {
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if (CD->isImplicit()) {
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for (auto *I : CD->inits()) {
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if (I->getInit()->IgnoreImpCasts() == StoreE) {
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OS << "Value assigned to field '" << I->getMember()->getName()
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<< "' in implicit constructor is garbage or undefined";
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break;
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}
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}
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}
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}
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break;
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}
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if (OS.str().empty())
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OS << DefaultMsg;
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auto R = std::make_unique<PathSensitiveBugReport>(*BT, OS.str(), N);
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if (ex) {
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R->addRange(ex->getSourceRange());
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bugreporter::trackExpressionValue(N, ex, *R);
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}
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C.emitReport(std::move(R));
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}
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void ento::registerUndefinedAssignmentChecker(CheckerManager &mgr) {
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mgr.registerChecker<UndefinedAssignmentChecker>();
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}
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bool ento::shouldRegisterUndefinedAssignmentChecker(const CheckerManager &mgr) {
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return true;
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}
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