Generalize loplugin:stringcopy to loplugin:redundantcopy

(such redundant std::unique_ptr copies could happen when changing parts of the
code base to make use of std::unique_ptr individually)

Change-Id: Ib48a45a212f9426a775c7f379bc5d3c92230218a

compilerplugins/clang/stringcopy.cxx → compilerplugins/clang/redundantcopy.cxx

@@ -25,10 +25,14 @@ public:
         }
         auto const t1 = expr->getTypeAsWritten();
         auto const t2 = compat::getSubExprAsWritten(expr)->getType();
-        if ((t1.getCanonicalType().getTypePtr()
+        if (t1.getCanonicalType().getTypePtr()
             != t2.getCanonicalType().getTypePtr())
-            || !(loplugin::TypeCheck(t1).Class("OUString").Namespace("rtl")
-                 .GlobalNamespace()))
+        {
+            return true;
+        }
+        auto tc = loplugin::TypeCheck(t1);
+        if (!(tc.Class("OUString").Namespace("rtl").GlobalNamespace()
+              || tc.Class("unique_ptr").StdNamespace()))
         {
             return true;
         }
@@ -47,7 +51,7 @@ private:
     }
 };
 
-static loplugin::Plugin::Registration<Visitor> reg("stringcopy");
+static loplugin::Plugin::Registration<Visitor> reg("redundantcopy");
 
 }
 

compilerplugins/clang/test/stringcopy.cxx → compilerplugins/clang/test/redundantcopy.cxx

@@ -9,15 +9,19 @@
 
 #include "sal/config.h"
 
+#include <memory>
+
 #include "rtl/ustring.hxx"
 
 int main() {
     OUString s;
-    (void) OUString(s); // expected-error {{redundant copy construction from 'rtl::OUString' to 'rtl::OUString' [loplugin:stringcopy]}}
+    (void) OUString(s); // expected-error {{redundant copy construction from 'rtl::OUString' to 'rtl::OUString' [loplugin:redundantcopy]}}
     using T1 = OUString;
-    (void) T1(s); // expected-error {{redundant copy construction from 'rtl::OUString' to 'T1' (aka 'rtl::OUString') [loplugin:stringcopy]}}
+    (void) T1(s); // expected-error {{redundant copy construction from 'rtl::OUString' to 'T1' (aka 'rtl::OUString') [loplugin:redundantcopy]}}
     using T2 = OUString const;
-    (void) T2(s); // expected-error {{redundant copy construction from 'rtl::OUString' to 'T2' (aka 'const rtl::OUString') [loplugin:stringcopy]}}
+    (void) T2(s); // expected-error {{redundant copy construction from 'rtl::OUString' to 'T2' (aka 'const rtl::OUString') [loplugin:redundantcopy]}}
+
+    (void) std::unique_ptr<int>(std::unique_ptr<int>(new int{})); // expected-error {{redundant copy construction from 'std::unique_ptr<int>' to 'std::unique_ptr<int>' [loplugin:redundantcopy]}}
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */

solenv/CompilerTest_compilerplugins_clang.mk

@@ -20,11 +20,11 @@ $(eval $(call gb_CompilerTest_add_exception_objects,compilerplugins_clang, \
     compilerplugins/clang/test/oslendian-2 \
     compilerplugins/clang/test/oslendian-3 \
     compilerplugins/clang/test/redundantcast \
+    compilerplugins/clang/test/redundantcopy \
     compilerplugins/clang/test/redundantinline \
     compilerplugins/clang/test/salbool \
     compilerplugins/clang/test/salunicodeliteral \
     compilerplugins/clang/test/stringconstant \
-    compilerplugins/clang/test/stringcopy \
     compilerplugins/clang/test/unnecessaryoverride-dtor \
     compilerplugins/clang/test/unoany \
     compilerplugins/clang/test/useuniqueptr \