124 lines
4.7 KiB
LLVM
124 lines
4.7 KiB
LLVM
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; RUN: opt < %s -globaldce -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; struct A {
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; A();
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; virtual int foo(int);
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; virtual int bar(float);
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; };
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;
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; struct B : A {
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; B();
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; virtual int foo(int);
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; virtual int bar(float);
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; };
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;
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; A::A() {}
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; B::B() {}
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; int A::foo(int) { return 1; }
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; int A::bar(float) { return 2; }
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; int B::foo(int) { return 3; }
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; int B::bar(float) { return 4; }
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;
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; extern "C" int test(B *p, int (B::*q)(int)) { return (p->*q)(42); }
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; Member function pointers are tracked by the combination of their object type
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; and function type, which must both be compatible. Here, the call is through a
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; pointer of type "int (B::*q)(int)", so the call could only be dispatched to
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; B::foo. It can't be dispatched to A::bar or B::bar as the function pointer
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; does not match, and it can't be dispatched to A::foo as the object type
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; doesn't match, so those can be removed.
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%struct.A = type { i32 (...)** }
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%struct.B = type { %struct.A }
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; CHECK: @_ZTV1A = internal unnamed_addr constant { [4 x i8*] } zeroinitializer
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@_ZTV1A = internal unnamed_addr constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* null, i8* bitcast (i32 (%struct.A*, i32)* @_ZN1A3fooEi to i8*), i8* bitcast (i32 (%struct.A*, float)* @_ZN1A3barEf to i8*)] }, align 8, !type !0, !type !1, !type !2, !vcall_visibility !3
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; CHECK: @_ZTV1B = internal unnamed_addr constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* null, i8* bitcast (i32 (%struct.B*, i32)* @_ZN1B3fooEi to i8*), i8* null] }
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@_ZTV1B = internal unnamed_addr constant { [4 x i8*] } { [4 x i8*] [i8* null, i8* null, i8* bitcast (i32 (%struct.B*, i32)* @_ZN1B3fooEi to i8*), i8* bitcast (i32 (%struct.B*, float)* @_ZN1B3barEf to i8*)] }, align 8, !type !0, !type !1, !type !2, !type !4, !type !5, !type !6, !vcall_visibility !3
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; CHECK-NOT: define internal i32 @_ZN1A3fooEi(
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define internal i32 @_ZN1A3fooEi(%struct.A* nocapture readnone %this, i32) unnamed_addr #1 align 2 {
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entry:
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ret i32 1
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}
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; CHECK-NOT: define internal i32 @_ZN1A3barEf(
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define internal i32 @_ZN1A3barEf(%struct.A* nocapture readnone %this, float) unnamed_addr #1 align 2 {
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entry:
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ret i32 2
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}
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; CHECK: define internal i32 @_ZN1B3fooEi(
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define internal i32 @_ZN1B3fooEi(%struct.B* nocapture readnone %this, i32) unnamed_addr #1 align 2 {
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entry:
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ret i32 3
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}
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; CHECK-NOT: define internal i32 @_ZN1B3barEf(
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define internal i32 @_ZN1B3barEf(%struct.B* nocapture readnone %this, float) unnamed_addr #1 align 2 {
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entry:
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ret i32 4
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}
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define hidden void @_ZN1AC2Ev(%struct.A* nocapture %this) {
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entry:
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%0 = getelementptr inbounds %struct.A, %struct.A* %this, i64 0, i32 0
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store i32 (...)** bitcast (i8** getelementptr inbounds ({ [4 x i8*] }, { [4 x i8*] }* @_ZTV1A, i64 0, inrange i32 0, i64 2) to i32 (...)**), i32 (...)*** %0, align 8
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ret void
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}
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define hidden void @_ZN1BC2Ev(%struct.B* nocapture %this) {
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entry:
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%0 = getelementptr inbounds %struct.B, %struct.B* %this, i64 0, i32 0, i32 0
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store i32 (...)** bitcast (i8** getelementptr inbounds ({ [4 x i8*] }, { [4 x i8*] }* @_ZTV1B, i64 0, inrange i32 0, i64 2) to i32 (...)**), i32 (...)*** %0, align 8
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ret void
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}
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define hidden i32 @test(%struct.B* %p, i64 %q.coerce0, i64 %q.coerce1) {
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entry:
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%0 = bitcast %struct.B* %p to i8*
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%1 = getelementptr inbounds i8, i8* %0, i64 %q.coerce1
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%this.adjusted = bitcast i8* %1 to %struct.B*
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%2 = and i64 %q.coerce0, 1
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%memptr.isvirtual = icmp eq i64 %2, 0
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br i1 %memptr.isvirtual, label %memptr.nonvirtual, label %memptr.virtual
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memptr.virtual: ; preds = %entry
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%3 = bitcast i8* %1 to i8**
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%vtable = load i8*, i8** %3, align 8
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%4 = add i64 %q.coerce0, -1
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%5 = getelementptr i8, i8* %vtable, i64 %4, !nosanitize !12
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%6 = tail call { i8*, i1 } @llvm.type.checked.load(i8* %5, i32 0, metadata !"_ZTSM1BFiiE.virtual"), !nosanitize !12
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%7 = extractvalue { i8*, i1 } %6, 0, !nosanitize !12
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%memptr.virtualfn = bitcast i8* %7 to i32 (%struct.B*, i32)*, !nosanitize !12
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br label %memptr.end
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memptr.nonvirtual: ; preds = %entry
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%memptr.nonvirtualfn = inttoptr i64 %q.coerce0 to i32 (%struct.B*, i32)*
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br label %memptr.end
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memptr.end: ; preds = %memptr.nonvirtual, %memptr.virtual
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%8 = phi i32 (%struct.B*, i32)* [ %memptr.virtualfn, %memptr.virtual ], [ %memptr.nonvirtualfn, %memptr.nonvirtual ]
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%call = tail call i32 %8(%struct.B* %this.adjusted, i32 42)
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ret i32 %call
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}
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declare { i8*, i1 } @llvm.type.checked.load(i8*, i32, metadata)
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!llvm.module.flags = !{!7}
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!0 = !{i64 16, !"_ZTS1A"}
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!1 = !{i64 16, !"_ZTSM1AFiiE.virtual"}
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!2 = !{i64 24, !"_ZTSM1AFifE.virtual"}
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!3 = !{i64 2}
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!4 = !{i64 16, !"_ZTS1B"}
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!5 = !{i64 16, !"_ZTSM1BFiiE.virtual"}
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!6 = !{i64 24, !"_ZTSM1BFifE.virtual"}
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!7 = !{i32 1, !"Virtual Function Elim", i32 1}
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!12 = !{}
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