update loplugin stylepolice to check local pointers vars

are actually pointer vars.

Also convert from regex to normal code, so we can enable this
plugin all the time.

Reviewed-on: https://gerrit.libreoffice.org/24391
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
(cherry picked from commit e8fd5a07eca70912ddee45aaa34d434809b59fb7)

Change-Id: Ie36a25ecba61c18f99c77c77646d6459a443cbd1

1 files changed, 142 insertions, 0 deletions

diff --git a/compilerplugins/clang/stylepolice.cxx b/compilerplugins/clang/stylepolice.cxx
new file mode 100644
index 000000000000..93b1fcea5a57
--- /dev/null
+++ b/compilerplugins/clang/stylepolice.cxx
@@ -0,0 +1,142 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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/.
+ */
+
+#include <regex>
+#include <string>
+#include <set>
+
+#include "compat.hxx"
+#include "plugin.hxx"
+
+// Check for some basic naming mismatches which make the code harder to read
+
+namespace {
+
+class StylePolice :
+    public RecursiveASTVisitor<StylePolice>, public loplugin::Plugin
+{
+public:
+    explicit StylePolice(InstantiationData const & data): Plugin(data) {}
+
+    virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
+
+    bool VisitVarDecl(const VarDecl *);
+private:
+    StringRef getFilename(SourceLocation loc);
+};
+
+StringRef StylePolice::getFilename(SourceLocation loc)
+{
+    SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(loc);
+    StringRef name { compiler.getSourceManager().getFilename(spellingLocation) };
+    return name;
+}
+
+bool startswith(const std::string& rStr, const char* pSubStr) {
+    return rStr.compare(0, strlen(pSubStr), pSubStr) == 0;
+}
+bool isUpperLetter(char c) {
+    return c >= 'A' && c <= 'Z';
+}
+bool isLowerLetter(char c) {
+    return c >= 'a' && c <= 'z';
+}
+bool isIdentifierLetter(char c) {
+    return isUpperLetter(c) || isLowerLetter(c);
+}
+bool matchPointerVar(const std::string& s) {
+    return s.size() > 2 && s[0] == 'p' && isUpperLetter(s[1]);
+}
+bool matchMember(const std::string& s) {
+    return s.size() > 3 && s[0] == 'm'
+        && (   ( strchr("abnprsx", s[1]) && isUpperLetter(s[2]) )
+            || ( s[1] == '_' && isIdentifierLetter(s[2]) ) );
+}
+
+bool StylePolice::VisitVarDecl(const VarDecl * varDecl)
+{
+    if (ignoreLocation(varDecl)) {
+        return true;
+    }
+    StringRef aFileName = getFilename(varDecl->getLocStart());
+    std::string name = varDecl->getName();
+
+    if (!varDecl->isLocalVarDecl()) {
+        return true;
+    }
+
+    if (matchMember(name))
+    {
+        // these names appear to be taken from some scientific paper
+        if (aFileName == SRCDIR "/scaddins/source/analysis/bessel.cxx" ) {
+        }
+        // lots of places where we are storing a "method id" here
+        else if (aFileName.startswith(SRCDIR "/connectivity/source/drivers/jdbc") && name.compare(0,3,"mID") == 0) {
+        }
+        else {
+            report(
+                DiagnosticsEngine::Warning,
+                "this local variable follows our member field naming convention, which is confusing",
+                varDecl->getLocation())
+                 << varDecl->getType() << varDecl->getSourceRange();
+        }
+    }
+
+    QualType qt = varDecl->getType().getDesugaredType(compiler.getASTContext()).getCanonicalType();
+    qt = qt.getNonReferenceType();
+    std::string typeName = qt.getAsString();
+    if (startswith(typeName, "const "))
+        typeName = typeName.substr(6);
+    if (startswith(typeName, "class "))
+        typeName = typeName.substr(6);
+    std::string aOriginalTypeName = varDecl->getType().getAsString();
+    if (!qt->isPointerType() && !qt->isArrayType() && !qt->isFunctionPointerType() && !qt->isMemberPointerType()
+        && matchPointerVar(name)
+        && !startswith(typeName, "boost::intrusive_ptr")
+        && !startswith(typeName, "boost::optional")
+        && !startswith(typeName, "boost::shared_ptr")
+        && !startswith(typeName, "com::sun::star::uno::Reference")
+        && !startswith(typeName, "cppu::OInterfaceIteratorHelper")
+        && !startswith(typeName, "formula::FormulaCompiler::CurrentFactor")
+        && aOriginalTypeName != "GLXPixmap"
+        && !startswith(typeName, "rtl::Reference")
+        && !startswith(typeName, "ScopedVclPtr")
+        && !startswith(typeName, "std::mem_fun")
+        && !startswith(typeName, "std::shared_ptr")
+        && !startswith(typeName, "shared_ptr") // weird issue in slideshow
+        && !startswith(typeName, "std::unique_ptr")
+        && !startswith(typeName, "unique_ptr") // weird issue in include/vcl/threadex.hxx
+        && !startswith(typeName, "std::weak_ptr")
+        && !startswith(typeName, "struct _LOKDocViewPrivate")
+        && !startswith(typeName, "sw::UnoCursorPointer")
+        && !startswith(typeName, "tools::SvRef")
+        && !startswith(typeName, "VclPtr")
+        && !startswith(typeName, "vcl::ScopedBitmapAccess")
+        // lots of the code seems to regard iterator objects as being "pointer-like"
+        && typeName.find("iterator<") == std::string::npos
+        && aOriginalTypeName != "sal_IntPtr" )
+    {
+        if (aFileName.startswith(SRCDIR "/bridges/") ) {
+        } else if (aFileName.startswith(SRCDIR "/vcl/source/fontsubset/sft.cxx") ) {
+        } else {
+            report(
+                DiagnosticsEngine::Warning,
+                "this local variable of type '%0' follows our pointer naming convention, but it is not a pointer, %1",
+                varDecl->getLocation())
+                 << typeName << aOriginalTypeName << varDecl->getSourceRange();
+        }
+    }
+    return true;
+}
+
+loplugin::Plugin::Registration< StylePolice > X("stylepolice");
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */