Export clang-format16 via ydblib project

6e6be3a95868fde888d801b7590af4044049563f

1 files changed, 125 insertions, 0 deletions

diff --git a/contrib/libs/clang16/lib/StaticAnalyzer/Checkers/UndefinedAssignmentChecker.cpp b/contrib/libs/clang16/lib/StaticAnalyzer/Checkers/UndefinedAssignmentChecker.cpp
new file mode 100644
index 0000000000..0fa3d60439
--- /dev/null
+++ b/contrib/libs/clang16/lib/StaticAnalyzer/Checkers/UndefinedAssignmentChecker.cpp
@@ -0,0 +1,125 @@
+//===--- UndefinedAssignmentChecker.h ---------------------------*- 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 UndefinedAssignmentChecker, a builtin check in ExprEngine that
+// checks for assigning undefined values.
+//
+//===----------------------------------------------------------------------===//
+
+#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"
+
+using namespace clang;
+using namespace ento;
+
+namespace {
+class UndefinedAssignmentChecker
+  : public Checker<check::Bind> {
+  mutable std::unique_ptr<BugType> BT;
+
+public:
+  void checkBind(SVal location, SVal val, const Stmt *S,
+                 CheckerContext &C) const;
+};
+}
+
+void UndefinedAssignmentChecker::checkBind(SVal location, SVal val,
+                                           const Stmt *StoreE,
+                                           CheckerContext &C) const {
+  if (!val.isUndef())
+    return;
+
+  // 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;
+
+  ExplodedNode *N = C.generateErrorNode();
+
+  if (!N)
+    return;
+
+  static const char *const DefaultMsg =
+      "Assigned value is garbage or undefined";
+  if (!BT)
+    BT.reset(new BuiltinBug(this, DefaultMsg));
+
+  // Generate a report for this bug.
+  llvm::SmallString<128> Str;
+  llvm::raw_svector_ostream OS(Str);
+
+  const Expr *ex = nullptr;
+
+  while (StoreE) {
+    if (const UnaryOperator *U = dyn_cast<UnaryOperator>(StoreE)) {
+      OS << "The expression is an uninitialized value. "
+            "The computed value will also be garbage";
+
+      ex = U->getSubExpr();
+      break;
+    }
+
+    if (const BinaryOperator *B = dyn_cast<BinaryOperator>(StoreE)) {
+      if (B->isCompoundAssignmentOp()) {
+        if (C.getSVal(B->getLHS()).isUndef()) {
+          OS << "The left expression of the compound assignment is an "
+                "uninitialized value. The computed value will also be garbage";
+          ex = B->getLHS();
+          break;
+        }
+      }
+
+      ex = B->getRHS();
+      break;
+    }
+
+    if (const DeclStmt *DS = dyn_cast<DeclStmt>(StoreE)) {
+      const VarDecl *VD = cast<VarDecl>(DS->getSingleDecl());
+      ex = VD->getInit();
+    }
+
+    if (const auto *CD =
+            dyn_cast<CXXConstructorDecl>(C.getStackFrame()->getDecl())) {
+      if (CD->isImplicit()) {
+        for (auto *I : CD->inits()) {
+          if (I->getInit()->IgnoreImpCasts() == StoreE) {
+            OS << "Value assigned to field '" << I->getMember()->getName()
+               << "' in implicit constructor is garbage or undefined";
+            break;
+          }
+        }
+      }
+    }
+
+    break;
+  }
+
+  if (OS.str().empty())
+    OS << DefaultMsg;
+
+  auto R = std::make_unique<PathSensitiveBugReport>(*BT, OS.str(), N);
+  if (ex) {
+    R->addRange(ex->getSourceRange());
+    bugreporter::trackExpressionValue(N, ex, *R);
+  }
+  C.emitReport(std::move(R));
+}
+
+void ento::registerUndefinedAssignmentChecker(CheckerManager &mgr) {
+  mgr.registerChecker<UndefinedAssignmentChecker>();
+}
+
+bool ento::shouldRegisterUndefinedAssignmentChecker(const CheckerManager &mgr) {
+  return true;
+}