Export clang-format16 via ydblib project

6e6be3a95868fde888d801b7590af4044049563f

1 files changed, 259 insertions, 0 deletions

diff --git a/contrib/libs/clang16/lib/StaticAnalyzer/Checkers/MallocSizeofChecker.cpp b/contrib/libs/clang16/lib/StaticAnalyzer/Checkers/MallocSizeofChecker.cpp
new file mode 100644
index 0000000000..58ba3dac69
--- /dev/null
+++ b/contrib/libs/clang16/lib/StaticAnalyzer/Checkers/MallocSizeofChecker.cpp
@@ -0,0 +1,259 @@
+// MallocSizeofChecker.cpp - Check for dubious malloc arguments ---*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Reports inconsistencies between the casted type of the return value of a
+// malloc/calloc/realloc call and the operand of any sizeof expressions
+// contained within its argument(s).
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
+#include "clang/AST/StmtVisitor.h"
+#include "clang/AST/TypeLoc.h"
+#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
+#include "clang/StaticAnalyzer/Core/Checker.h"
+#include "clang/StaticAnalyzer/Core/CheckerManager.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+using namespace ento;
+
+namespace {
+
+typedef std::pair<const TypeSourceInfo *, const CallExpr *> TypeCallPair;
+typedef llvm::PointerUnion<const Stmt *, const VarDecl *> ExprParent;
+
+class CastedAllocFinder
+  : public ConstStmtVisitor<CastedAllocFinder, TypeCallPair> {
+  IdentifierInfo *II_malloc, *II_calloc, *II_realloc;
+
+public:
+  struct CallRecord {
+    ExprParent CastedExprParent;
+    const Expr *CastedExpr;
+    const TypeSourceInfo *ExplicitCastType;
+    const CallExpr *AllocCall;
+
+    CallRecord(ExprParent CastedExprParent, const Expr *CastedExpr,
+               const TypeSourceInfo *ExplicitCastType,
+               const CallExpr *AllocCall)
+      : CastedExprParent(CastedExprParent), CastedExpr(CastedExpr),
+        ExplicitCastType(ExplicitCastType), AllocCall(AllocCall) {}
+  };
+
+  typedef std::vector<CallRecord> CallVec;
+  CallVec Calls;
+
+  CastedAllocFinder(ASTContext *Ctx) :
+    II_malloc(&Ctx->Idents.get("malloc")),
+    II_calloc(&Ctx->Idents.get("calloc")),
+    II_realloc(&Ctx->Idents.get("realloc")) {}
+
+  void VisitChild(ExprParent Parent, const Stmt *S) {
+    TypeCallPair AllocCall = Visit(S);
+    if (AllocCall.second && AllocCall.second != S)
+      Calls.push_back(CallRecord(Parent, cast<Expr>(S), AllocCall.first,
+                                 AllocCall.second));
+  }
+
+  void VisitChildren(const Stmt *S) {
+    for (const Stmt *Child : S->children())
+      if (Child)
+        VisitChild(S, Child);
+  }
+
+  TypeCallPair VisitCastExpr(const CastExpr *E) {
+    return Visit(E->getSubExpr());
+  }
+
+  TypeCallPair VisitExplicitCastExpr(const ExplicitCastExpr *E) {
+    return TypeCallPair(E->getTypeInfoAsWritten(),
+                        Visit(E->getSubExpr()).second);
+  }
+
+  TypeCallPair VisitParenExpr(const ParenExpr *E) {
+    return Visit(E->getSubExpr());
+  }
+
+  TypeCallPair VisitStmt(const Stmt *S) {
+    VisitChildren(S);
+    return TypeCallPair();
+  }
+
+  TypeCallPair VisitCallExpr(const CallExpr *E) {
+    VisitChildren(E);
+    const FunctionDecl *FD = E->getDirectCallee();
+    if (FD) {
+      IdentifierInfo *II = FD->getIdentifier();
+      if (II == II_malloc || II == II_calloc || II == II_realloc)
+        return TypeCallPair((const TypeSourceInfo *)nullptr, E);
+    }
+    return TypeCallPair();
+  }
+
+  TypeCallPair VisitDeclStmt(const DeclStmt *S) {
+    for (const auto *I : S->decls())
+      if (const VarDecl *VD = dyn_cast<VarDecl>(I))
+        if (const Expr *Init = VD->getInit())
+          VisitChild(VD, Init);
+    return TypeCallPair();
+  }
+};
+
+class SizeofFinder : public ConstStmtVisitor<SizeofFinder> {
+public:
+  std::vector<const UnaryExprOrTypeTraitExpr *> Sizeofs;
+
+  void VisitBinMul(const BinaryOperator *E) {
+    Visit(E->getLHS());
+    Visit(E->getRHS());
+  }
+
+  void VisitImplicitCastExpr(const ImplicitCastExpr *E) {
+    return Visit(E->getSubExpr());
+  }
+
+  void VisitParenExpr(const ParenExpr *E) {
+    return Visit(E->getSubExpr());
+  }
+
+  void VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E) {
+    if (E->getKind() != UETT_SizeOf)
+      return;
+
+    Sizeofs.push_back(E);
+  }
+};
+
+// Determine if the pointee and sizeof types are compatible.  Here
+// we ignore constness of pointer types.
+static bool typesCompatible(ASTContext &C, QualType A, QualType B) {
+  // sizeof(void*) is compatible with any other pointer.
+  if (B->isVoidPointerType() && A->getAs<PointerType>())
+    return true;
+
+  // sizeof(pointer type) is compatible with void*
+  if (A->isVoidPointerType() && B->getAs<PointerType>())
+    return true;
+
+  while (true) {
+    A = A.getCanonicalType();
+    B = B.getCanonicalType();
+
+    if (A.getTypePtr() == B.getTypePtr())
+      return true;
+
+    if (const PointerType *ptrA = A->getAs<PointerType>())
+      if (const PointerType *ptrB = B->getAs<PointerType>()) {
+        A = ptrA->getPointeeType();
+        B = ptrB->getPointeeType();
+        continue;
+      }
+
+    break;
+  }
+
+  return false;
+}
+
+static bool compatibleWithArrayType(ASTContext &C, QualType PT, QualType T) {
+  // Ex: 'int a[10][2]' is compatible with 'int', 'int[2]', 'int[10][2]'.
+  while (const ArrayType *AT = T->getAsArrayTypeUnsafe()) {
+    QualType ElemType = AT->getElementType();
+    if (typesCompatible(C, PT, AT->getElementType()))
+      return true;
+    T = ElemType;
+  }
+
+  return false;
+}
+
+class MallocSizeofChecker : public Checker<check::ASTCodeBody> {
+public:
+  void checkASTCodeBody(const Decl *D, AnalysisManager& mgr,
+                        BugReporter &BR) const {
+    AnalysisDeclContext *ADC = mgr.getAnalysisDeclContext(D);
+    CastedAllocFinder Finder(&BR.getContext());
+    Finder.Visit(D->getBody());
+    for (CastedAllocFinder::CallVec::iterator i = Finder.Calls.begin(),
+         e = Finder.Calls.end(); i != e; ++i) {
+      QualType CastedType = i->CastedExpr->getType();
+      if (!CastedType->isPointerType())
+        continue;
+      QualType PointeeType = CastedType->getPointeeType();
+      if (PointeeType->isVoidType())
+        continue;
+
+      for (CallExpr::const_arg_iterator ai = i->AllocCall->arg_begin(),
+           ae = i->AllocCall->arg_end(); ai != ae; ++ai) {
+        if (!(*ai)->getType()->isIntegralOrUnscopedEnumerationType())
+          continue;
+
+        SizeofFinder SFinder;
+        SFinder.Visit(*ai);
+        if (SFinder.Sizeofs.size() != 1)
+          continue;
+
+        QualType SizeofType = SFinder.Sizeofs[0]->getTypeOfArgument();
+
+        if (typesCompatible(BR.getContext(), PointeeType, SizeofType))
+          continue;
+
+        // If the argument to sizeof is an array, the result could be a
+        // pointer to any array element.
+        if (compatibleWithArrayType(BR.getContext(), PointeeType, SizeofType))
+          continue;
+
+        const TypeSourceInfo *TSI = nullptr;
+        if (i->CastedExprParent.is<const VarDecl *>()) {
+          TSI =
+              i->CastedExprParent.get<const VarDecl *>()->getTypeSourceInfo();
+        } else {
+          TSI = i->ExplicitCastType;
+        }
+
+        SmallString<64> buf;
+        llvm::raw_svector_ostream OS(buf);
+
+        OS << "Result of ";
+        const FunctionDecl *Callee = i->AllocCall->getDirectCallee();
+        if (Callee && Callee->getIdentifier())
+          OS << '\'' << Callee->getIdentifier()->getName() << '\'';
+        else
+          OS << "call";
+        OS << " is converted to a pointer of type '" << PointeeType
+           << "', which is incompatible with "
+           << "sizeof operand type '" << SizeofType << "'";
+        SmallVector<SourceRange, 4> Ranges;
+        Ranges.push_back(i->AllocCall->getCallee()->getSourceRange());
+        Ranges.push_back(SFinder.Sizeofs[0]->getSourceRange());
+        if (TSI)
+          Ranges.push_back(TSI->getTypeLoc().getSourceRange());
+
+        PathDiagnosticLocation L =
+            PathDiagnosticLocation::createBegin(i->AllocCall->getCallee(),
+                BR.getSourceManager(), ADC);
+
+        BR.EmitBasicReport(D, this, "Allocator sizeof operand mismatch",
+                           categories::UnixAPI, OS.str(), L, Ranges);
+      }
+    }
+  }
+};
+
+}
+
+void ento::registerMallocSizeofChecker(CheckerManager &mgr) {
+  mgr.registerChecker<MallocSizeofChecker>();
+}
+
+bool ento::shouldRegisterMallocSizeofChecker(const CheckerManager &mgr) {
+  return true;
+}