case DeclarationName::Identifier: {
const IdentifierInfo *II = Name.getAsIdentifierInfo();
- // We mangle decomposition declarations as the name of their first binding.
+ // We mangle decomposition declarations as the names of their bindings.
if (auto *DD = dyn_cast<DecompositionDecl>(ND)) {
- auto B = DD->bindings();
- if (B.begin() == B.end()) {
- // FIXME: This is ill-formed but we accept it as an extension.
- DiagnosticsEngine &Diags = Context.getDiags();
- unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
- "cannot mangle global empty decomposition decl");
- Diags.Report(DD->getLocation(), DiagID);
- break;
- }
- II = (*B.begin())->getIdentifier();
+ // FIXME: Non-standard mangling for decomposition declarations:
+ //
+ // <unqualified-name> ::= DC <source-name>* E
+ //
+ // These can never be referenced across translation units, so we do
+ // not need a cross-vendor mangling for anything other than demanglers.
+ // Proposed on cxx-abi-dev on 2016-08-12
+ Out << "DC";
+ for (auto *BD : DD->bindings())
+ mangleSourceName(BD->getDeclName().getAsIdentifierInfo());
+ Out << 'E';
+ writeAbiTags(ND, AdditionalAbiTags);
+ break;
}
if (II) {
--- /dev/null
+// RUN: %clang_cc1 -std=c++1z -emit-llvm -o - %s | FileCheck %s
+
+namespace std {
+ using size_t = decltype(sizeof(0));
+ template<typename> struct tuple_size;
+ template<size_t, typename> struct tuple_element;
+}
+
+struct Y { int n; };
+struct X { X(); X(Y); X(const X&); ~X(); };
+
+struct A { int a : 13; bool b; };
+
+struct B {};
+template<> struct std::tuple_size<B> { enum { value = 2 }; };
+template<> struct std::tuple_element<0,B> { using type = X; };
+template<> struct std::tuple_element<1,B> { using type = const int&; };
+template<int N> auto get(B) {
+ if constexpr (N == 0)
+ return Y();
+ else
+ return 0.0;
+}
+
+using C = int[2];
+
+typedef int D __attribute__((ext_vector_type(2)));
+
+using E = _Complex int;
+
+template<typename T> T &make();
+
+// CHECK: @_ZDC2a12a2E = global {{.*}} zeroinitializer, align 4
+auto [a1, a2] = make<A>();
+// CHECK: @_ZDC2b12b2E = global {{.*}} zeroinitializer, align 1
+// CHECK: @b1 = global {{.*}}* null, align 8
+// CHECK: @_ZGR2b1_ = internal global {{.*}} zeroinitializer, align 1
+// CHECK: @b2 = global i32* null, align 8
+// CHECK: @_ZGR2b2_ = internal global i32 0, align 4
+auto [b1, b2] = make<B>();
+// CHECK: @_ZDC2c12c2E = global [2 x i32]* null, align 8
+auto &[c1, c2] = make<C>();
+// CHECK: @_ZDC2d12d2E = global <2 x i32> zeroinitializer, align 8
+auto [d1, d2] = make<D>();
+// CHECK: @_ZDC2e12e2E = global { i32, i32 } zeroinitializer, align 4
+auto [e1, e2] = make<E>();
+
+// CHECK: call {{.*}}* @_Z4makeI1AERT_v()
+// CHECK: call {{.*}}memcpy{{.*}}@_ZDC2a12a2E
+
+// CHECK: @_Z4makeI1BERT_v()
+// CHECK: call i32 @_Z3getILi0EEDa1B()
+// CHECK: call void @_ZN1XC1E1Y({{.*}}* @_ZGR2b1_, i32
+// CHECK: call i32 @__cxa_atexit({{.*}}@_ZN1XD1Ev{{.*}}@_ZGR2b1_
+// CHECK: store {{.*}}* @_ZGR2b1_,
+//
+// CHECK: call double @_Z3getILi1EEDa1B()
+// CHECK: fptosi double %{{.*}} to i32
+// CHECK: store i32 %{{.*}}, i32* @_ZGR2b2_
+// CHECK: store i32* @_ZGR2b2_, i32** @b2
+
+// CHECK: call {{.*}}* @_Z4makeIA2_iERT_v()
+// CHECK: store {{.*}}, [2 x i32]** @_ZDC2c12c2E
+
+// CHECK: call {{.*}}* @_Z4makeIDv2_iERT_v()
+// CHECK: store {{.*}}, <2 x i32>* @_ZDC2d12d2E, align 8
+
+// CHECK: call {{.*}}* @_Z4makeICiERT_v()
+// CHECK: store i32 %{{.*}}, i32* getelementptr inbounds ({ i32, i32 }, { i32, i32 }* @_ZDC2e12e2E, i32 0, i32 0)
+// CHECK: store i32 %{{.*}}, i32* getelementptr inbounds ({ i32, i32 }, { i32, i32 }* @_ZDC2e12e2E, i32 0, i32 1)
+
+// CHECK: define i32 @_Z12test_globalsv()
+int test_globals() {
+ return a2 + b2 + c2 + d2 + e2;
+ // CHECK: load i8, i8* getelementptr inbounds (%struct.A, %struct.A* @_ZDC2a12a2E, i32 0, i32 1)
+ //
+ // CHECK: %[[b2:.*]] = load i32*, i32** @b2
+ // CHECK: load i32, i32* %[[b2]]
+ //
+ // CHECK: %[[c1c2:.*]] = load [2 x i32]*, [2 x i32]** @_ZDC2c12c2E
+ // CHECK: %[[c2:.*]] = getelementptr inbounds [2 x i32], [2 x i32]* %[[c1c2]], i64 0, i64 1
+ // CHECK: load i32, i32* %[[c2]]
+ //
+ // CHECK: %[[d1d2:.*]] = load <2 x i32>, <2 x i32>* @_ZDC2d12d2E
+ // CHECK: extractelement <2 x i32> %[[d1d2]], i32 1
+ //
+ // CHECK: load i32, i32* getelementptr inbounds ({ i32, i32 }, { i32, i32 }* @_ZDC2e12e2E, i32 0, i32 1)
+}
+
+// CHECK: define i32 @_Z11test_localsv()
+int test_locals() {
+ auto [b1, b2] = make<B>();
+
+ // CHECK: @_Z4makeI1BERT_v()
+ // CHECK: call i32 @_Z3getILi0EEDa1B()
+ // CHECK: call void @_ZN1XC1E1Y({{.*}}* %[[b1:.*]], i32
+ //
+ // CHECK: call double @_Z3getILi1EEDa1B()
+ // CHECK: %[[cvt:.*]] = fptosi double %{{.*}} to i32
+ // CHECK: store i32 %[[cvt]], i32* %[[b2:.*]],
+ // CHECK: store i32* %[[b2]], i32** %[[b2ref:.*]],
+
+ return b2;
+ // CHECK: %[[b2:.*]] = load i32*, i32** %[[b2ref]]
+ // CHECK: load i32, i32* %[[b2]]
+
+ // CHECK: call {{.*}}@_ZN1XD1Ev({{.*}}%[[b1]])
+}
+
+// CHECK: define void @_Z13test_bitfieldR1A(
+void test_bitfield(A &a) {
+ auto &[a1, a2] = a;
+ a1 = 5;
+ // CHECK: load i16, i16* %[[BITFIELD:.*]],
+ // CHECK: and i16 %{{.*}}, -8192
+ // CHECK: or i16 %{{.*}}, 5
+ // CHECK: store i16 %{{.*}}, i16* %[[BITFIELD]],
+}