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0f46e31cfb
As part of the migration to ptradd (https://discourse.llvm.org/t/rfc-replacing-getelementptr-with-ptradd/68699), we need to change the representation of the `inrange` attribute, which is used for vtable splitting. Currently, inrange is specified as follows: ``` getelementptr inbounds ({ [4 x ptr], [4 x ptr] }, ptr @vt, i64 0, inrange i32 1, i64 2) ``` The `inrange` is placed on a GEP index, and all accesses must be "in range" of that index. The new representation is as follows: ``` getelementptr inbounds inrange(-16, 16) ({ [4 x ptr], [4 x ptr] }, ptr @vt, i64 0, i32 1, i64 2) ``` This specifies which offsets are "in range" of the GEP result. The new representation will continue working when canonicalizing to ptradd representation: ``` getelementptr inbounds inrange(-16, 16) (i8, ptr @vt, i64 48) ``` The inrange offsets are relative to the return value of the GEP. An alternative design could make them relative to the source pointer instead. The result-relative format was chosen on the off-chance that we want to extend support to non-constant GEPs in the future, in which case this variant is more expressive. This implementation "upgrades" the old inrange representation in bitcode by simply dropping it. This is a very niche feature, and I don't think trying to upgrade it is worthwhile. Let me know if you disagree.
90 lines
8.0 KiB
C++
90 lines
8.0 KiB
C++
// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -std=c++11 -emit-llvm -o - | FileCheck %s
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// Test1::B should just have a single entry in its VTT, which points to the vtable.
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namespace Test1 {
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struct A { };
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struct B : virtual A {
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virtual void f();
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};
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void B::f() { }
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}
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// Check that we don't add a secondary virtual pointer for Test2::A, since Test2::A doesn't have any virtual member functions or bases.
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namespace Test2 {
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struct A { };
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struct B : A { virtual void f(); };
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struct C : virtual B { };
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C c;
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}
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// This is the sample from the C++ Itanium ABI, p2.6.2.
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namespace Test3 {
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class A1 { int i; };
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class A2 { int i; virtual void f(); };
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class V1 : public A1, public A2 { int i; };
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class B1 { int i; };
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class B2 { int i; };
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class V2 : public B1, public B2, public virtual V1 { int i; };
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class V3 {virtual void g(); };
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class C1 : public virtual V1 { int i; };
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class C2 : public virtual V3, virtual V2 { int i; };
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class X1 { int i; };
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class C3 : public X1 { int i; };
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class D : public C1, public C2, public C3 { int i; };
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D d;
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}
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// This is the sample from the C++ Itanium ABI, p2.6.2, with the change suggested
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// (making A2 a virtual base of V1)
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namespace Test4 {
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class A1 { int i; };
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class A2 { int i; virtual void f(); };
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class V1 : public A1, public virtual A2 { int i; };
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class B1 { int i; };
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class B2 { int i; };
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class V2 : public B1, public B2, public virtual V1 { int i; };
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class V3 {virtual void g(); };
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class C1 : public virtual V1 { int i; };
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class C2 : public virtual V3, virtual V2 { int i; };
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class X1 { int i; };
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class C3 : public X1 { int i; };
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class D : public C1, public C2, public C3 { int i; };
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D d;
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}
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namespace Test5 {
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struct A {
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virtual void f() = 0;
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virtual void anchor();
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};
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void A::anchor() {
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}
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}
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namespace Test6 {
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struct A {
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virtual void f() = delete;
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virtual void anchor();
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};
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void A::anchor() {
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}
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}
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// CHECK: @_ZTTN5Test11BE ={{.*}} unnamed_addr constant [1 x ptr] [ptr getelementptr inbounds inrange(-24, 8) ({ [4 x ptr] }, ptr @_ZTVN5Test11BE, i32 0, i32 0, i32 3)]
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// CHECK: @_ZTVN5Test51AE ={{.*}} unnamed_addr constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr @_ZTIN5Test51AE, ptr @__cxa_pure_virtual, ptr @_ZN5Test51A6anchorEv] }
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// CHECK: @_ZTVN5Test61AE ={{.*}} unnamed_addr constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr @_ZTIN5Test61AE, ptr @__cxa_deleted_virtual, ptr @_ZN5Test61A6anchorEv] }
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// CHECK: @_ZTTN5Test21CE = linkonce_odr unnamed_addr constant [2 x ptr] [ptr getelementptr inbounds inrange(-32, 8) ({ [5 x ptr] }, ptr @_ZTVN5Test21CE, i32 0, i32 0, i32 4), ptr getelementptr inbounds inrange(-32, 8) ({ [5 x ptr] }, ptr @_ZTVN5Test21CE, i32 0, i32 0, i32 4)]
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// CHECK: @_ZTTN5Test31DE = linkonce_odr unnamed_addr constant [13 x ptr] [ptr getelementptr inbounds inrange(-40, 0) ({ [5 x ptr], [7 x ptr], [4 x ptr], [3 x ptr] }, ptr @_ZTVN5Test31DE, i32 0, i32 0, i32 5), ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test31DE0_NS_2C1E, i32 0, i32 0, i32 3), ptr getelementptr inbounds inrange(-24, 8) ({ [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test31DE0_NS_2C1E, i32 0, i32 1, i32 3), ptr getelementptr inbounds inrange(-48, 8) ({ [7 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test31DE16_NS_2C2E, i32 0, i32 0, i32 6), ptr getelementptr inbounds inrange(-48, 8) ({ [7 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test31DE16_NS_2C2E, i32 0, i32 0, i32 6), ptr getelementptr inbounds inrange(-24, 0) ({ [7 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test31DE16_NS_2C2E, i32 0, i32 1, i32 3), ptr getelementptr inbounds inrange(-24, 8) ({ [7 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test31DE16_NS_2C2E, i32 0, i32 2, i32 3), ptr getelementptr inbounds inrange(-24, 8) ({ [5 x ptr], [7 x ptr], [4 x ptr], [3 x ptr] }, ptr @_ZTVN5Test31DE, i32 0, i32 2, i32 3), ptr getelementptr inbounds inrange(-48, 8) ({ [5 x ptr], [7 x ptr], [4 x ptr], [3 x ptr] }, ptr @_ZTVN5Test31DE, i32 0, i32 1, i32 6), ptr getelementptr inbounds inrange(-48, 8) ({ [5 x ptr], [7 x ptr], [4 x ptr], [3 x ptr] }, ptr @_ZTVN5Test31DE, i32 0, i32 1, i32 6), ptr getelementptr inbounds inrange(-24, 0) ({ [5 x ptr], [7 x ptr], [4 x ptr], [3 x ptr] }, ptr @_ZTVN5Test31DE, i32 0, i32 3, i32 3), ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test31DE64_NS_2V2E, i32 0, i32 0, i32 3), ptr getelementptr inbounds inrange(-24, 8) ({ [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test31DE64_NS_2V2E, i32 0, i32 1, i32 3)]
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// CHECK: @_ZTVN5Test41DE = linkonce_odr unnamed_addr constant { [6 x ptr], [8 x ptr], [3 x ptr], [4 x ptr], [4 x ptr] } { [6 x ptr] [ptr inttoptr (i64 72 to ptr), ptr inttoptr (i64 16 to ptr), ptr inttoptr (i64 56 to ptr), ptr inttoptr (i64 40 to ptr), ptr null, ptr @_ZTIN5Test41DE], [8 x ptr] [ptr inttoptr (i64 40 to ptr), ptr inttoptr (i64 24 to ptr), ptr inttoptr (i64 56 to ptr), ptr null, ptr null, ptr inttoptr (i64 -16 to ptr), ptr @_ZTIN5Test41DE, ptr @_ZN5Test42V31gEv], [3 x ptr] [ptr inttoptr (i64 16 to ptr), ptr inttoptr (i64 -40 to ptr), ptr @_ZTIN5Test41DE], [4 x ptr] [ptr null, ptr inttoptr (i64 -56 to ptr), ptr @_ZTIN5Test41DE, ptr @_ZN5Test42A21fEv], [4 x ptr] [ptr inttoptr (i64 -16 to ptr), ptr inttoptr (i64 -32 to ptr), ptr inttoptr (i64 -72 to ptr), ptr @_ZTIN5Test41DE] }
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// CHECK: @_ZTTN5Test41DE = linkonce_odr unnamed_addr constant [19 x ptr] [ptr getelementptr inbounds inrange(-48, 0) ({ [6 x ptr], [8 x ptr], [3 x ptr], [4 x ptr], [4 x ptr] }, ptr @_ZTVN5Test41DE, i32 0, i32 0, i32 6), ptr getelementptr inbounds inrange(-32, 0) ({ [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE0_NS_2C1E, i32 0, i32 0, i32 4), ptr getelementptr inbounds inrange(-24, 0) ({ [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE0_NS_2C1E, i32 0, i32 1, i32 3), ptr getelementptr inbounds inrange(-24, 8) ({ [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE0_NS_2C1E, i32 0, i32 2, i32 3), ptr getelementptr inbounds inrange(-56, 8) ({ [8 x ptr], [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE16_NS_2C2E, i32 0, i32 0, i32 7), ptr getelementptr inbounds inrange(-56, 8) ({ [8 x ptr], [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE16_NS_2C2E, i32 0, i32 0, i32 7), ptr getelementptr inbounds inrange(-32, 0) ({ [8 x ptr], [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE16_NS_2C2E, i32 0, i32 1, i32 4), ptr getelementptr inbounds inrange(-24, 0) ({ [8 x ptr], [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE16_NS_2C2E, i32 0, i32 2, i32 3), ptr getelementptr inbounds inrange(-24, 8) ({ [8 x ptr], [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE16_NS_2C2E, i32 0, i32 3, i32 3), ptr getelementptr inbounds inrange(-24, 0) ({ [6 x ptr], [8 x ptr], [3 x ptr], [4 x ptr], [4 x ptr] }, ptr @_ZTVN5Test41DE, i32 0, i32 2, i32 3), ptr getelementptr inbounds inrange(-24, 8) ({ [6 x ptr], [8 x ptr], [3 x ptr], [4 x ptr], [4 x ptr] }, ptr @_ZTVN5Test41DE, i32 0, i32 3, i32 3), ptr getelementptr inbounds inrange(-56, 8) ({ [6 x ptr], [8 x ptr], [3 x ptr], [4 x ptr], [4 x ptr] }, ptr @_ZTVN5Test41DE, i32 0, i32 1, i32 7), ptr getelementptr inbounds inrange(-56, 8) ({ [6 x ptr], [8 x ptr], [3 x ptr], [4 x ptr], [4 x ptr] }, ptr @_ZTVN5Test41DE, i32 0, i32 1, i32 7), ptr getelementptr inbounds inrange(-32, 0) ({ [6 x ptr], [8 x ptr], [3 x ptr], [4 x ptr], [4 x ptr] }, ptr @_ZTVN5Test41DE, i32 0, i32 4, i32 4), ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE40_NS_2V1E, i32 0, i32 0, i32 3), ptr getelementptr inbounds inrange(-24, 8) ({ [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE40_NS_2V1E, i32 0, i32 1, i32 3), ptr getelementptr inbounds inrange(-32, 0) ({ [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE72_NS_2V2E, i32 0, i32 0, i32 4), ptr getelementptr inbounds inrange(-24, 0) ({ [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE72_NS_2V2E, i32 0, i32 1, i32 3), ptr getelementptr inbounds inrange(-24, 8) ({ [4 x ptr], [3 x ptr], [4 x ptr] }, ptr @_ZTCN5Test41DE72_NS_2V2E, i32 0, i32 2, i32 3)]
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// CHECK: declare void @__cxa_pure_virtual() unnamed_addr
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// CHECK: declare void @__cxa_deleted_virtual() unnamed_addr
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