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-rw-r--r--compilerplugins/clang/data.cxx89
1 files changed, 89 insertions, 0 deletions
diff --git a/compilerplugins/clang/data.cxx b/compilerplugins/clang/data.cxx
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+++ b/compilerplugins/clang/data.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#ifndef LO_CLANG_SHARED_PLUGINS
+
+#include "check.hxx"
+#include "compat.hxx"
+#include "plugin.hxx"
+
+// For std::array or std::vector x, replace &x[0] with x.data().
+
+namespace
+{
+class Data final : public loplugin::FilteringPlugin<Data>
+{
+public:
+ explicit Data(loplugin::InstantiationData const& data)
+ : FilteringPlugin(data)
+ {
+ }
+
+ bool VisitUnaryOperator(UnaryOperator const* expr)
+ {
+ if (ignoreLocation(expr))
+ {
+ return true;
+ }
+ if (expr->getOpcode() != UO_AddrOf)
+ {
+ return true;
+ }
+ auto const e1 = dyn_cast<CXXOperatorCallExpr>(expr->getSubExpr()->IgnoreParenImpCasts());
+ if (e1 == nullptr)
+ {
+ return true;
+ }
+ if (e1->getOperator() != OO_Subscript)
+ {
+ return true;
+ }
+ auto const t = e1->getArg(0)->getType();
+ auto const chk = loplugin::TypeCheck(t);
+ if (!(chk.Class("array").StdNamespace() || chk.Class("vector").StdNamespace()))
+ {
+ return true;
+ }
+ auto const e2 = e1->getArg(1);
+ if (e2->isValueDependent())
+ {
+ return true;
+ }
+ APSInt v;
+ if (!compat::EvaluateAsInt(e2, v, compiler.getASTContext()))
+ {
+ return true;
+ }
+ if (v != 0)
+ {
+ return true;
+ }
+ report(DiagnosticsEngine::Warning,
+ "use 'data' member function to access first element of %0", expr->getExprLoc())
+ << t << expr->getSourceRange();
+ return true;
+ }
+
+ bool preRun() override { return compiler.getLangOpts().CPlusPlus; }
+
+ void run() override
+ {
+ if (preRun())
+ {
+ TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
+ }
+ }
+};
+
+static loplugin::Plugin::Registration<Data> data("data");
+
+} // namespace
+
+#endif // LO_CLANG_SHARED_PLUGINS
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */