1 files changed, 308 insertions, 0 deletions
diff --git a/clang/test/CodeGenCXX/thunks.cpp b/clang/test/CodeGenCXX/thunks.cpp
new file mode 100644
index 0000000..04d0820
--- /dev/null
+++ b/clang/test/CodeGenCXX/thunks.cpp
@@ -0,0 +1,308 @@
+// RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 %s -triple=x86_64-pc-linux-gnu -fhidden-weak-vtables -emit-llvm -o - | FileCheck -check-prefix=HIDDEN %s
+
+namespace Test1 {
+
+// Check that we emit a non-virtual thunk for C::f.
+
+struct A {
+  virtual void f();
+};
+
+struct B {
+  virtual void f();
+};
+
+struct C : A, B {
+  virtual void c();
+  
+  virtual void f();
+};
+
+// CHECK: define void @_ZThn8_N5Test11C1fEv(
+void C::f() { }
+
+}
+
+namespace Test2 {
+
+// Check that we emit a thunk for B::f since it's overriding a virtual base.
+
+struct A {
+  virtual void f();
+};
+
+struct B : virtual A {
+  virtual void b();
+  virtual void f();
+};
+
+// CHECK: define void @_ZTv0_n24_N5Test21B1fEv(
+void B::f() { }
+
+}
+
+namespace Test3 {
+
+// Check that we emit a covariant thunk for B::f.
+
+struct V1 { };
+struct V2 : virtual V1 { };
+
+struct A {
+  virtual V1 *f();
+};
+
+struct B : A {
+  virtual void b();
+  
+  virtual V2 *f();
+};
+
+// CHECK: define %{{.*}}* @_ZTch0_v0_n24_N5Test31B1fEv(
+V2 *B::f() { return 0; }
+
+}
+
+namespace Test4 {
+
+// Check that the thunk for 'C::f' has the same visibility as the function itself.
+
+struct A {
+  virtual void f();
+};
+
+struct B {
+  virtual void f();
+};
+
+struct __attribute__((visibility("protected"))) C : A, B {
+  virtual void c();
+  
+  virtual void f();
+};
+
+// CHECK: define protected void @_ZThn8_N5Test41C1fEv(
+void C::f() { }
+
+}
+
+// Check that the thunk gets internal linkage.
+namespace Test4B {
+  struct A {
+    virtual void f();
+  };
+
+  struct B {
+    virtual void f();
+  };
+
+  namespace {
+    struct C : A, B {
+      virtual void c();
+      virtual void f();
+    };
+  }
+  void C::c() {}
+  void C::f() {}
+
+  // Force C::f to be used.
+  void f() { 
+    C c; 
+    c.f();
+  }
+}
+
+namespace Test5 {
+
+// Check that the thunk for 'B::f' gets the same linkage as the function itself.
+struct A {
+  virtual void f();
+};
+
+struct B : virtual A {
+  virtual void f() { }
+};
+
+void f(B b) {
+  b.f();
+}
+}
+
+namespace Test6 {
+  struct X {
+    X();
+    X(const X&);
+    X &operator=(const X&);
+    ~X();
+  };
+
+  struct P {
+    P();
+    P(const P&);
+    ~P();
+    X first;
+    X second;
+  };
+
+  P getP();
+
+  struct Base1 {
+    int i;
+
+    virtual X f() { return X(); }
+  };
+
+  struct Base2 {
+    float real;
+
+    virtual X f() { return X(); }
+  };
+
+  struct Thunks : Base1, Base2 {
+    long l;
+
+    virtual X f();
+  };
+
+  // CHECK: define void @_ZThn16_N5Test66Thunks1fEv
+  // CHECK-NOT: memcpy
+  // CHECK: {{call void @_ZN5Test66Thunks1fEv.*sret}}
+  // CHECK: ret void
+  X Thunks::f() { return X(); }
+}
+
+namespace Test7 {
+  // PR7188
+  struct X {
+    X();
+    X(const X&);
+    X &operator=(const X&);
+    ~X();
+  };
+
+  struct Small { short s; };
+  struct Large {
+    char array[1024];
+  };
+
+  class A {
+  protected:
+    virtual void foo() = 0;
+  };
+
+  class B : public A {
+  protected:
+    virtual void bar() = 0;
+  };
+
+  class C : public A  {
+  protected:
+    virtual void baz(X, X&, _Complex float, Small, Small&, Large) = 0;
+  };
+
+  class D : public B,
+            public C {
+
+    void foo() {}
+    void bar() {}
+    void baz(X, X&, _Complex float, Small, Small&, Large);
+  };
+
+  void D::baz(X, X&, _Complex float, Small, Small&, Large) { }
+
+  // CHECK: define void @_ZThn8_N5Test71D3bazENS_1XERS1_CfNS_5SmallERS4_NS_5LargeE(
+  // CHECK-NOT: memcpy
+  // CHECK: ret void
+  void testD() { D d; }
+}
+
+namespace Test8 {
+  struct NonPOD { ~NonPOD(); int x, y, z; };
+  struct A { virtual void foo(); };
+  struct B { virtual void bar(NonPOD); };
+  struct C : A, B { virtual void bar(NonPOD); static void helper(NonPOD); };
+
+  // CHECK: define void @_ZN5Test81C6helperENS_6NonPODE([[NONPODTYPE:%.*]]*
+  void C::helper(NonPOD var) {}
+
+  // CHECK: define void @_ZThn8_N5Test81C3barENS_6NonPODE(
+  // CHECK-NOT: load [[NONPODTYPE]]*
+  // CHECK-NOT: memcpy
+  // CHECK: ret void
+  void C::bar(NonPOD var) {}
+}
+
+// PR7241: Emitting thunks for a method shouldn't require the vtable for
+// that class to be emitted.
+namespace Test9 {
+  struct A { virtual ~A() { } };
+  struct B : A { virtual void test() const {} };
+  struct C : B { C(); ~C(); };
+  struct D : C { D() {} };
+  void test() {
+    D d;
+  }
+}
+
+namespace Test10 {
+  struct A { virtual void foo(); };
+  struct B { virtual void foo(); };
+  struct C : A, B { void foo() {} };
+
+  // CHECK-HIDDEN: define linkonce_odr void @_ZN6Test101C3fooEv
+  // CHECK-HIDDEN: define linkonce_odr hidden void @_ZThn8_N6Test101C3fooEv
+
+  void test() {
+    C c;
+  }
+}
+
+// PR7611
+namespace Test11 {
+  struct A {             virtual A* f(); };
+  struct B : virtual A { virtual A* f(); };
+  struct C : B         { virtual C* f(); };
+  C* C::f() { return 0; }
+
+  //  C::f itself.
+  // CHECK: define {{.*}} @_ZN6Test111C1fEv(
+
+  //  The this-adjustment and return-adjustment thunk required when
+  //  C::f appears in a vtable where A is at a nonzero offset from C.
+  // CHECK: define {{.*}} @_ZTcv0_n24_v0_n32_N6Test111C1fEv(
+
+  //  The return-adjustment thunk required when C::f appears in a vtable
+  //  where A is at a zero offset from C.
+  // CHECK: define {{.*}} @_ZTch0_v0_n32_N6Test111C1fEv(
+}
+
+// Varargs thunk test.
+namespace Test12 {
+  struct A {
+    virtual A* f(int x, ...);
+  };
+  struct B {
+    virtual B* f(int x, ...);
+  };
+  struct C : A, B {
+    virtual void c();
+    virtual C* f(int x, ...);
+  };
+  C* C::f(int x, ...) { return this; }
+
+  // C::f
+  // CHECK: define {{.*}} @_ZN6Test121C1fEiz
+
+  // Varargs thunk; check that both the this and covariant adjustments
+  // are generated.
+  // CHECK: define {{.*}} @_ZTchn8_h8_N6Test121C1fEiz
+  // CHECK: getelementptr inbounds i8* {{.*}}, i64 -8
+  // CHECK: getelementptr inbounds i8* {{.*}}, i64 8
+}
+
+/**** The following has to go at the end of the file ****/
+
+// This is from Test5:
+// CHECK: define linkonce_odr void @_ZTv0_n24_N5Test51B1fEv
+// CHECK: define internal void @_ZThn8_N6Test4B12_GLOBAL__N_11C1fEv(