Convert the no-inline-virtuals rule into a constructors rule.

tools/clang/plugins/tests/virtual_bodies.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VIRTUAL_METHODS_H_
 #define VIRTUAL_METHODS_H_
 
 // Note: This is not actual windows.h but the stub file in system/windows.h
 #include <windows.h>
 
-#define CR_BEGIN_MSG_MAP_EX(theClass) virtual int f() { return 4; }
-#define BEGIN_SAFE_MSG_MAP_EX(theClass) virtual int g() { return 4; }
-
-// Should warn about virtual method usage.
-class VirtualMethodsInHeaders {
- public:
-  // Don't complain about these.
-  virtual void MethodIsAbstract() = 0;
-  virtual void MethodHasNoArguments();
-  virtual void MethodHasEmptyDefaultImpl() {}
-
-  // But complain about this:
-  virtual bool ComplainAboutThis() { return true; }
-
-  SYSTEM_INLINE_VIRTUAL
-  CR_BEGIN_MSG_MAP_EX(Sub)
-  BEGIN_SAFE_MSG_MAP_EX(Sub)
+struct NonTrivial {
+  NonTrivial();
+  ~NonTrivial();
 };
 
-// Complain on missing 'virtual' keyword in overrides.
-class WarnOnMissingVirtual : public VirtualMethodsInHeaders {
+// Should warn about inline constructors with too many inline virtual methods.
+class InlineVirtualMethodsInHeaders {
  public:
-  void MethodHasNoArguments() override;
+  // Complain about the inline/missing constructor.
+  virtual void Method1() {}
+  virtual bool Method2() { return true; }
+  virtual void Method3() {}
+  virtual bool Method4() { return true; }
+  virtual void Method5() {}
 };
 
-// Don't complain about things in a 'testing' namespace.
-namespace testing {
-struct TestStruct {};
-}  // namespace testing
+// Should warn about inline constructors with long inline virtual methods.
+class LongInlineVirtualMethods {
+ public:
+  // Complain about the inline/missing constructor.
+  virtual int LongMethod() {
+    int x = 1;
+    int y = x * x;
+    int w = 73;
+    int u = 1;
+    for (int z = 7; z < 8; ++z) {
+      if (z > x) {
+        return x + 1;
+      } else {
+        return z - 1;
+      }
+    }
+    return 1;
+  }
+};
 
-class VirtualMethodsInHeadersTesting : public VirtualMethodsInHeaders {
+// Should not warn if enough virtual methods are out-of-line.

[dcheng, 2016/03/24 17:37:25]

Nit: I find this comment a bit confusing because the check is actually
implemented as # of inline virtuals > some complexity limit, and not (directly)
a count of the number of out-of-lined virtuals.

+class OutoflineVirtualMethodsInHeaders {
  public:
-  // Don't complain about no virtual testing methods.
-  void MethodHasNoArguments();
+  // Complain about the inline/missing constructor.
+  virtual void Method1();
+  virtual bool Method2() { return true; }
+  virtual void Method3() {}
+  virtual bool Method4() { return true; }
+  virtual void Method5() {}
+};
+
+class InlineVirtualMethodsInAbstractClass {
+ public:
+  // Accept an inline constructor for a base class.
+  virtual void Abstract() = 0;
+  virtual void Method1() {}
+  virtual bool Method2() { return true; }
+  virtual void Method3() {}
+  virtual bool Method4() { return true; }
+  virtual void Method5() {}
+};
+
+class InlineVirtualMethodsWithProtectedConstructor {
+ protected:
+  // Accept an inline constructor for a base class.
+  InlineVirtualMethodsWithProtectedConstructor() {}
+
+ public:
+  virtual void Method1() {}
+  virtual bool Method2() { return true; }
+  virtual void Method3() {}
+  virtual bool Method4() { return true; }
+  virtual void Method5() {}
+};
+
+// Complain for leaf classes even if they inherit their inline virtual methods.
+class InlineVirtualMethodsInLeafClass
+    : public InlineVirtualMethodsInAbstractClass {
+ public:
+  void Abstract() override;
+};
+
+class DtorInlineVirtualMethodsInHeaders {
+ public:
+  DtorInlineVirtualMethodsInHeaders();
+  // Complain about the inline destructor.

[dcheng, 2016/03/24 17:37:25]

Nit: non-virtual inline

+  ~DtorInlineVirtualMethodsInHeaders() {}
+
+  virtual void Method1() {}
+  virtual bool Method2() { return true; }
+  virtual void Method3() {}
+  virtual bool Method4() { return true; }
+  virtual void Method5() {}
 
  private:
-  testing::TestStruct tester_;
+  NonTrivial non_trivial;
+};
+
+class VirtualDtorInlineVirtualMethodsInHeaders {
+ public:
+  VirtualDtorInlineVirtualMethodsInHeaders();
+  // Don't complain about the inline virtual destructor.
+  virtual ~VirtualDtorInlineVirtualMethodsInHeaders() {}
+
+  virtual void Method1() {}
+  virtual bool Method2() { return true; }
+  virtual void Method3() {}
+  virtual bool Method4() { return true; }
+  virtual void Method5() {}
+
+ private:
+  NonTrivial non_trivial;
+};
+
+// Check for a bug in which the inline destructor for the most-derived class is
+// re-counted for each base class whose destructor it overrides.
+struct Base1 {
+  virtual ~Base1();
+  virtual void Abstract() = 0;
+};
+struct Base2 : Base1 {};
+struct Base3 : Base2 {};
+struct Base4 : Base3 {};
+struct Base5 : Base4 {};
+struct Base6 : Base5 {};
+struct Base7 : Base6 {};
+struct Base8 : Base7 {};
+struct Base9 : Base8 {};
+struct Derived : Base9 {
+  ~Derived() override {}
+  void Abstract() override;
 };
 
 #endif  // VIRTUAL_METHODS_H_