| 1 | // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s |
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| 2 | |
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| 3 | // PR36992 |
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| 4 | namespace Implicit { |
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| 5 | struct A { char c; A(const A&); }; |
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| 6 | struct B { int n; char c[3]; ~B(); }; |
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| 7 | struct C : B, virtual A {}; |
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| 8 | static_assert(sizeof(C) == sizeof(void*) + 8); |
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| 9 | C f(C c) { return c; } |
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| 10 | |
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| 11 | // CHECK: define {{.*}} @_ZN8Implicit1CC1EOS0_ |
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| 12 | // CHECK: call {{.*}} @_ZN8Implicit1AC2ERKS0_( |
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| 13 | // Note: this must memcpy 7 bytes, not 8, to avoid trampling over the virtual base class. |
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| 14 | // CHECK: call void @llvm.memcpy.p0i8.p0i8.i{{32|64}}(i8* {{.*}}, i8* {{.*}}, i{{32|64}} 7, i1 false) |
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| 15 | // CHECK: store i32 {{.*}} @_ZTVN8Implicit1CE |
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| 16 | } |
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| 17 | |
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| 18 | namespace InitWithinNVSize { |
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| 19 | // This is the same as the previous test, except that the A base lies |
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| 20 | // entirely within the nvsize of C. This makes it valid to copy at the |
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| 21 | // full width. |
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| 22 | struct A { char c; A(const A&); }; |
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| 23 | struct B { int n; char c[3]; ~B(); }; |
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| 24 | struct C : B, virtual A { char x; }; |
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| 25 | static_assert(sizeof(C) > sizeof(void*) + 8); |
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| 26 | C f(C c) { return c; } |
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| 27 | |
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| 28 | // CHECK: define {{.*}} @_ZN16InitWithinNVSize1CC1EOS0_ |
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| 29 | // CHECK: call {{.*}} @_ZN16InitWithinNVSize1AC2ERKS0_( |
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| 30 | // This copies over the 'C::x' member, but that's OK because we've not initialized it yet. |
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| 31 | // CHECK: call void @llvm.memcpy.p0i8.p0i8.i{{32|64}}(i8* {{.*}}, i8* {{.*}}, i{{32|64}} 8, i1 false) |
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| 32 | // CHECK: store i32 {{.*}} @_ZTVN16InitWithinNVSize1CE |
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| 33 | // CHECK: store i8 |
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| 34 | } |
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| 35 | |
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