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.
65 lines
2.3 KiB
LLVM
65 lines
2.3 KiB
LLVM
; RUN: opt -S -passes=globalsplit %s | FileCheck %s
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target datalayout = "e-p:64:64"
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK: @vtt = constant [3 x ptr] [ptr @global.0, ptr getelementptr inbounds (i8, ptr @global.0, i64 8), ptr @global.1]
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@vtt = constant [3 x ptr] [
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ptr getelementptr inrange(0, 16) ({ [2 x ptr], [1 x ptr] }, ptr @global, i32 0, i32 0, i32 0),
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ptr getelementptr inrange(-8, 8) ({ [2 x ptr], [1 x ptr] }, ptr @global, i32 0, i32 0, i32 1),
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ptr getelementptr inrange(0, 8) ({ [2 x ptr], [1 x ptr] }, ptr @global, i32 0, i32 1, i32 0)
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]
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; CHECK-NOT: @global =
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; CHECK: @global.0 = private constant [2 x ptr] [ptr @f1, ptr @f2], !type [[T1:![0-9]+]], !type [[T2:![0-9]+]], !type [[T3:![0-9]+]], !vcall_visibility [[VIS:![0-9]+]]{{$}}
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; CHECK: @global.1 = private constant [1 x ptr] [ptr @f3], !type [[T4:![0-9]+]], !type [[T5:![0-9]+]], !vcall_visibility [[VIS]]{{$}}
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; CHECK-NOT: @global =
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@global = internal constant { [2 x ptr], [1 x ptr] } {
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[2 x ptr] [ptr @f1, ptr @f2],
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[1 x ptr] [ptr @f3]
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}, !type !0, !type !1, !type !2, !type !3, !type !4, !vcall_visibility !5
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; CHECK: define ptr @f1()
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define ptr @f1() {
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; CHECK-NEXT: ret ptr @global.0
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ret ptr getelementptr inrange(0, 16) ({ [2 x ptr], [1 x ptr] }, ptr @global, i32 0, i32 0, i32 0)
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}
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; CHECK: define ptr @f2()
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define ptr @f2() {
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; CHECK-NEXT: ret ptr getelementptr inbounds (i8, ptr @global.0, i64 8)
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ret ptr getelementptr inrange(-8, 8) ({ [2 x ptr], [1 x ptr] }, ptr @global, i32 0, i32 0, i32 1)
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}
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; CHECK: define ptr @f3()
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define ptr @f3() {
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; CHECK-NEXT: ret ptr getelementptr (i8, ptr @global.0, i64 16)
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ret ptr getelementptr inrange(-16, 0) ({ [2 x ptr], [1 x ptr] }, ptr @global, i32 0, i32 0, i32 2)
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}
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; CHECK: define ptr @f4()
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define ptr @f4() {
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; CHECK-NEXT: ret ptr @global.1
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ret ptr getelementptr inrange(0, 8) ({ [2 x ptr], [1 x ptr] }, ptr @global, i32 0, i32 1, i32 0)
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}
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define void @foo() {
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%p = call i1 @llvm.type.test(ptr null, metadata !"")
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ret void
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}
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declare i1 @llvm.type.test(ptr, metadata) nounwind readnone
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; CHECK: [[T1]] = !{i32 0, !"foo"}
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; CHECK: [[T2]] = !{i32 15, !"bar"}
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; CHECK: [[T3]] = !{i32 16, !"a"}
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; CHECK: [[VIS]] = !{i64 2}
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; CHECK: [[T4]] = !{i32 1, !"b"}
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; CHECK: [[T5]] = !{i32 8, !"c"}
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!0 = !{i32 0, !"foo"}
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!1 = !{i32 15, !"bar"}
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!2 = !{i32 16, !"a"}
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!3 = !{i32 17, !"b"}
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!4 = !{i32 24, !"c"}
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!5 = !{i64 2}
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