51 lines
2.2 KiB
C++
51 lines
2.2 KiB
C++
/// Check that the offset to top calculation is adjusted to account for the
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/// omitted RTTI entry.
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-linux-gnu -fexperimental-omit-vtable-rtti -fno-rtti -S -o - -emit-llvm | FileCheck -check-prefixes=POINTER %s
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-linux-gnu -fexperimental-relative-c++-abi-vtables -fexperimental-omit-vtable-rtti -fno-rtti -S -o - -emit-llvm | FileCheck -check-prefixes=RELATIVE %s
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/// Some important things to check:
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/// - The n16 here represents the virtual thunk size. Normally this would be 24
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/// to represent 3 components (offset to top, RTTI component, vcall offset),
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/// but since one 8-byte component is removed, this is now 16.
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// POINTER-LABEL: @_ZTv0_n16_N7Derived1fEi(
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// POINTER-NEXT: entry:
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// POINTER: [[vtable:%.+]] = load ptr, ptr %this1, align 8
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/// Same here - When getting the vbase offset, we subtract 2 pointer sizes
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/// instead of 3.
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// POINTER-NEXT: [[vbase_offset_ptr:%.+]] = getelementptr inbounds i8, ptr [[vtable]], i64 -16
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// POINTER-NEXT: [[vbase_offset:%.+]] = load i64, ptr [[vbase_offset_ptr]], align 8
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// POINTER-NEXT: [[adj_this:%.+]] = getelementptr inbounds i8, ptr %this1, i64 [[vbase_offset]]
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// POINTER: [[call:%.+]] = tail call noundef i32 @_ZN7Derived1fEi(ptr noundef{{[^,]*}} [[adj_this]], i32 noundef {{.*}})
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// POINTER: ret i32 [[call]]
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/// For relative vtables, it's almost the same except the offset sizes are
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/// halved.
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// RELATIVE-LABEL: @_ZTv0_n8_N7Derived1fEi(
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// RELATIVE-NEXT: entry:
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// RELATIVE: [[vtable:%.+]] = load ptr, ptr %this1, align 8
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// RELATIVE-NEXT: [[vbase_offset_ptr:%.+]] = getelementptr inbounds i8, ptr [[vtable]], i64 -8
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// RELATIVE-NEXT: [[vbase_offset:%.+]] = load i32, ptr [[vbase_offset_ptr]], align 4
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// RELATIVE-NEXT: [[adj_this:%.+]] = getelementptr inbounds i8, ptr %this1, i32 [[vbase_offset]]
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// RELATIVE: [[call:%.+]] = tail call noundef i32 @_ZN7Derived1fEi(ptr noundef{{[^,]*}} [[adj_this]], i32 noundef {{.*}})
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// RELATIVE: ret i32 [[call]]
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class Base {
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public:
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virtual int f(int x);
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private:
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long x;
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};
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class Derived : public virtual Base {
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public:
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virtual int f(int x);
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private:
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long y;
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};
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int Base::f(int x) { return x + 1; }
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int Derived::f(int x) { return x + 2; }
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