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a2347baaec
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
77 lines
1.7 KiB
C++
77 lines
1.7 KiB
C++
// RUN: %clang_cc1 -triple armv7-none-eabi -emit-llvm -o - %s | FileCheck %s
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struct A { int x; A(int); ~A(); };
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A f() { return A(0); }
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// CHECK-LABEL: define void @_Z1fv
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// CHECK: call {{.*}} @_ZN1AC1Ei
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// CHECK-NEXT: ret void
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// Verify that we do not elide copies when constructing a base class.
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namespace no_elide_base {
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struct Base {
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Base(const Base&);
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~Base();
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};
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struct Other {
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operator Base() const;
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};
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struct Derived : public virtual Base {
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Derived(const Other &O);
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};
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// CHECK: define {{.*}} @_ZN13no_elide_base7DerivedC1ERKNS_5OtherE(%"struct.no_elide_base::Derived"* returned %this, %"struct.no_elide_base::Other"* dereferenceable({{[0-9]+}}) %O) unnamed_addr
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Derived::Derived(const Other &O)
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// CHECK: call {{.*}} @_ZNK13no_elide_base5OthercvNS_4BaseEEv
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// CHECK: call {{.*}} @_ZN13no_elide_base4BaseC2ERKS0_
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// CHECK: call {{.*}} @_ZN13no_elide_base4BaseD1Ev
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: Base(O)
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{
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// CHECK: ret
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}
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}
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// PR8683.
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namespace PR8683 {
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struct A {
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A();
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A(const A&);
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A& operator=(const A&);
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};
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struct B {
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A a;
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};
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void f() {
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// Verify that we don't mark the copy constructor in this expression as elidable.
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// CHECK: call {{.*}} @_ZN6PR86831AC1ERKS0_
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A a = (B().a);
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}
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}
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namespace PR12139 {
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struct A {
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A() : value(1) { }
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A(A const &, int value = 2) : value(value) { }
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int value;
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static A makeA() { A a; a.value = 2; return a; }
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};
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// CHECK-LABEL: define i32 @_ZN7PR121394testEv
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int test() {
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// CHECK: call void @_ZN7PR121391A5makeAEv
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// CHECK-NEXT: call %"struct.PR12139::A"* @_ZN7PR121391AC1ERKS0_i
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A a(A::makeA(), 3);
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// CHECK-NEXT: getelementptr inbounds
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// CHECK-NEXT: load
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// CHECK-NEXT: ret i32
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return a.value;
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}
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}
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