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48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
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// RUN: %clang_cc1 -triple x86_64-windows-gnu -emit-llvm -o - %s | FileCheck %s
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// RUN: %clang_cc1 -triple powerpc64le-windows-gnu -emit-llvm -o - %s | FileCheck %s
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// An empty struct is handled as a struct with a dummy i8, on all targets.
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// Most targets treat an empty struct return value as essentially void - but
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// some don't. (Currently, at least x86_64-windows-* and powerpc64le-* don't
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// treat it as void.)
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//
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// When intializing a struct with such a no_unique_address member, make sure we
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// don't write the dummy i8 into the struct where there's no space allocated for
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// it.
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//
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// This can only be tested with targets that don't treat empty struct returns as
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// void.
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struct S {};
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S f();
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struct Z {
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int x;
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[[no_unique_address]] S y;
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Z();
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};
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Z::Z() : x(111), y(f()) {}
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// CHECK: define {{.*}} @_ZN1ZC2Ev
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// CHECK: %call = call i8 @_Z1fv()
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// CHECK-NEXT: ret void
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// Check that the constructor for an empty member gets called with the right
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// 'this' pointer.
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struct S2 {
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S2();
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};
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struct Z2 {
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int x;
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[[no_unique_address]] S2 y;
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Z2();
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};
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Z2::Z2() : x(111) {}
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// CHECK: define {{.*}} @_ZN2Z2C2Ev(ptr {{.*}} %this)
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// CHECK: %this.addr = alloca ptr
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// CHECK: store ptr %this, ptr %this.addr
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// CHECK: %this1 = load ptr, ptr %this.addr
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// CHECK: call void @_ZN2S2C1Ev(ptr {{.*}} %this1)
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