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Because references must be initialized using some evaluated expression, they must point to something, and a callee can assume the reference parameter is dereferenceable. Taking advantage of a new attribute just added to LLVM, mark them as such. Because dereferenceability in addrspace(0) implies nonnull in the backend, we don't need both attributes. However, we need to know the size of the object to use the dereferenceable attribute, so for incomplete types we still emit only nonnull. llvm-svn: 213386
108 lines
2.1 KiB
C++
108 lines
2.1 KiB
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -std=c++11 | FileCheck %s
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struct A {
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A();
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A(const A&);
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A(A&);
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~A();
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};
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struct B {
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B();
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B(B&);
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};
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struct C {
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C() {}
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C(C& other, A a = A());
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int i, j;
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};
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struct POD {
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int array[3][4];
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};
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struct D : A, B, virtual C {
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D();
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int scalar;
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int scalar_array[2][3];
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B class_member;
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C class_member_array[2][3];
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POD pod_array[2][3];
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union {
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int x;
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float f[3];
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};
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};
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void f(D d) {
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D d2(d);
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}
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// CHECK-LABEL: define linkonce_odr void @_ZN1DC1ERS_(%struct.D* %this, %struct.D* dereferenceable({{[0-9]+}})) unnamed_addr
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// CHECK: call void @_ZN1AC1Ev
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// CHECK: call void @_ZN1CC2ERS_1A
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// CHECK: call void @_ZN1AD1Ev
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// CHECK: call void @_ZN1AC2ERS_
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// CHECK: call void @_ZN1BC2ERS_
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// CHECK: {{call void @llvm.memcpy.p0i8.p0i8.i64.*i64 28}}
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// CHECK: call void @_ZN1BC1ERS_
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// CHECK: br
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// CHECK: {{icmp ult.*, 2}}
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// CHECK: {{icmp ult.*, 3}}
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// CHECK: call void @_ZN1AC1Ev
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// CHECK: call void @_ZN1CC1ERS_1A
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// CHECK: call void @_ZN1AD1Ev
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// CHECK: {{call void @llvm.memcpy.p0i8.p0i8.i64.*i64 300}}
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// CHECK: ret void
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template<class T> struct X0 { void f0(T * ) { } };
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template <class > struct X1 { X1( X1& , int = 0 ) { } };
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struct X2 { X1<int> result; };
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void test_X2()
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{
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typedef X2 impl;
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typedef X0<impl> pimpl;
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impl* i;
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pimpl pdata;
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pdata.f0( new impl(*i));
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}
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// rdar://problem/9598341
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namespace test3 {
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struct A { A(const A&); A&operator=(const A&); };
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struct B { A a; unsigned : 0; };
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void test(const B &x) {
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B y = x;
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y = x;
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}
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}
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namespace test4 {
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// When determining whether to implement an array copy as a memcpy, look at
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// whether the *selected* constructor is trivial.
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struct S {
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int arr[5][5];
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S(S &);
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S(const S &) = default;
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};
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// CHECK: @_ZN5test42f1
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void f1(S a) {
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// CHECK-NOT: memcpy
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// CHECK: call void @_ZN5test41SC1ERS0_
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// CHECK-NOT: memcpy
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S b(a);
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// CHECK: }
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}
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// CHECK: @_ZN5test42f2
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void f2(const S a) {
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// CHECK-NOT: call void @_ZN5test41SC1ERS0_
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// CHECK: memcpy
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// CHECK-NOT: call void @_ZN5test41SC1ERS0_
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S b(a);
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// CHECK: }
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}
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}
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