71568a9e28
This patch contains all of the clang changes from D72959. - Generalize the relative vtables ABI such that it can be used by other targets. - Add an enum VTableComponentLayout which controls whether components in the vtable should be pointers to other structs or relative offsets to those structs. Other ABIs can change this enum to restructure how components in the vtable are laid out/accessed. - Add methods to ConstantInitBuilder for inserting relative offsets to a specified position in the aggregate being constructed. - Fix failing tests under new PM and ASan and MSan issues. See D72959 for background info. Differential Revision: https://reviews.llvm.org/D77592
37 lines
1.3 KiB
C++
37 lines
1.3 KiB
C++
// Check that the pointer adjustment from the virtual base offset is loaded as a
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// 32-bit int.
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -S -o - -emit-llvm -fexperimental-relative-c++-abi-vtables | FileCheck %s
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// CHECK-LABEL: @_ZTv0_n12_N7Derived1fEi(
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// CHECK-NEXT: entry:
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// CHECK: [[this:%.+]] = bitcast %class.Derived* %this1 to i8*
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// CHECK-NEXT: [[this2:%.+]] = bitcast i8* [[this]] to i8**
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// CHECK-NEXT: [[vtable:%.+]] = load i8*, i8** [[this2]], align 8
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// CHECK-NEXT: [[vbase_offset_ptr:%.+]] = getelementptr inbounds i8, i8* [[vtable]], i64 -12
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// CHECK-NEXT: [[vbase_offset_ptr2:%.+]] = bitcast i8* [[vbase_offset_ptr]] to i32*
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// CHECK-NEXT: [[vbase_offset:%.+]] = load i32, i32* [[vbase_offset_ptr2]], align 4
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// CHECK-NEXT: [[adj_this:%.+]] = getelementptr inbounds i8, i8* [[this]], i32 [[vbase_offset]]
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// CHECK-NEXT: [[adj_this2:%.+]] = bitcast i8* [[adj_this]] to %class.Derived*
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// CHECK: [[call:%.+]] = tail call i32 @_ZN7Derived1fEi(%class.Derived* [[adj_this2]], i32 {{.*}})
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// CHECK: 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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