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Skip ImplWitnessTable::elements_id when generating fingerprints (#7629)

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Implementing interface modifiers causes an infinite loop when generating
fingerprints because the witness value generates a fingerprint that's
dependent on something dependent on the witness value. We've debugged
this to the witness table's `elements_id` field.

This hack is a workaround for creating a new block type whose value is
not codependent with its identity.

Co-authored-by: Richard Smith <richard@metafoo.co.uk>

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This commit is contained in:
Christopher Di Bella
2026-08-11 22:39:30 +00:00
committed by GitHub
co-authored by Richard Smith
parent cb5e9b6555
commit 4ea5ef45dd
368 changed files with 11718 additions and 11723 deletions
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toolchain/lower/testdata/function/generic/call_basic_depth.carbon
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+6 -6
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@@ -52,7 +52,7 @@ fn M() -> i32 {
// CHECK:STDOUT: %.loc34 = load i32, ptr %n.var, align 4, !dbg !10
// CHECK:STDOUT: call void @_CF.Main.84588f41d61dafba(i32 %.loc34), !dbg !11
// CHECK:STDOUT: %.loc35_9 = load i32, ptr %n.var, align 4, !dbg !12
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.58016a73bff04416(i32 %.loc35_9), !dbg !13
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.553a1f59d1dd8381(i32 %.loc35_9), !dbg !13
// CHECK:STDOUT: store i32 %G.call, ptr %m.var, align 4, !dbg !14
// CHECK:STDOUT: %.loc36 = load i32, ptr %m.var, align 4, !dbg !15
// CHECK:STDOUT: call void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %m.var), !dbg !9
@@ -76,11 +76,11 @@ fn M() -> i32 {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CG.Main.58016a73bff04416(i32 %x) #0 !dbg !27 {
// CHECK:STDOUT: define linkonce_odr i32 @_CG.Main.553a1f59d1dd8381(i32 %x) #0 !dbg !27 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc25_6.3.temp = alloca i32, align 4, !dbg !32
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc25_6.3.temp), !dbg !32
// CHECK:STDOUT: %H.call = call i32 @_CH.Main.5bd8d5767580997a(i32 %x), !dbg !32
// CHECK:STDOUT: %H.call = call i32 @_CH.Main.4d6ceefeb7f772f4(i32 %x), !dbg !32
// CHECK:STDOUT: store i32 %H.call, ptr %.loc25_6.3.temp, align 4, !dbg !32
// CHECK:STDOUT: call void @"_COp.5e27612b9dd31a14:core.Destroy.Core"(ptr %.loc25_6.3.temp), !dbg !32
// CHECK:STDOUT: call void @_CF.Main.84588f41d61dafba(i32 %x), !dbg !33
@@ -88,7 +88,7 @@ fn M() -> i32 {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CH.Main.5bd8d5767580997a(i32 %x) #0 !dbg !35 {
// CHECK:STDOUT: define linkonce_odr i32 @_CH.Main.4d6ceefeb7f772f4(i32 %x) #0 !dbg !35 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CF.Main.84588f41d61dafba(i32 %x), !dbg !38
// CHECK:STDOUT: ret i32 %x, !dbg !39
@@ -131,7 +131,7 @@ fn M() -> i32 {
// CHECK:STDOUT: !24 = !{!25}
// CHECK:STDOUT: !25 = !DILocalVariable(arg: 1, scope: !23, type: !7)
// CHECK:STDOUT: !26 = !DILocation(line: 16, column: 1, scope: !23)
// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.58016a73bff04416", scope: null, file: !1, line: 24, type: !28, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !30)
// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.553a1f59d1dd8381", scope: null, file: !1, line: 24, type: !28, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !30)
// CHECK:STDOUT: !28 = !DISubroutineType(types: !29)
// CHECK:STDOUT: !29 = !{!7, !7}
// CHECK:STDOUT: !30 = !{!31}
@@ -139,7 +139,7 @@ fn M() -> i32 {
// CHECK:STDOUT: !32 = !DILocation(line: 25, column: 3, scope: !27)
// CHECK:STDOUT: !33 = !DILocation(line: 26, column: 3, scope: !27)
// CHECK:STDOUT: !34 = !DILocation(line: 27, column: 3, scope: !27)
// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.5bd8d5767580997a", scope: null, file: !1, line: 19, type: !28, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !36)
// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.4d6ceefeb7f772f4", scope: null, file: !1, line: 19, type: !28, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !36)
// CHECK:STDOUT: !36 = !{!37}
// CHECK:STDOUT: !37 = !DILocalVariable(arg: 1, scope: !35, type: !7)
// CHECK:STDOUT: !38 = !DILocation(line: 20, column: 3, scope: !35)