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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/local_function.carbon
Vendored
+6 -6
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@@ -30,19 +30,19 @@ fn Run() -> i32 {
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @main() #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %F.call = call i32 @_CF.Main.5bd8d5767580997a(i32 0), !dbg !8
// CHECK:STDOUT: %F.call = call i32 @_CF.Main.4d6ceefeb7f772f4(i32 0), !dbg !8
// CHECK:STDOUT: ret i32 %F.call, !dbg !9
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CF.Main.5bd8d5767580997a(i32 %y) #0 !dbg !10 {
// CHECK:STDOUT: define linkonce_odr i32 @_CF.Main.4d6ceefeb7f772f4(i32 %y) #0 !dbg !10 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %G.call = call i32 @"_CG:enclosed.5bd8d5767580997a"(i32 %y), !dbg !15
// CHECK:STDOUT: %G.call = call i32 @"_CG:enclosed.4d6ceefeb7f772f4"(i32 %y), !dbg !15
// CHECK:STDOUT: ret i32 %G.call, !dbg !16
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @"_CG:enclosed.5bd8d5767580997a"(i32 %x) #0 !dbg !17 {
// CHECK:STDOUT: define linkonce_odr i32 @"_CG:enclosed.4d6ceefeb7f772f4"(i32 %x) #0 !dbg !17 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret i32 %x, !dbg !20
// CHECK:STDOUT: }
@@ -62,14 +62,14 @@ fn Run() -> i32 {
// CHECK:STDOUT: !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !8 = !DILocation(line: 23, column: 10, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 23, column: 3, scope: !4)
// CHECK:STDOUT: !10 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.5bd8d5767580997a", scope: null, file: !1, line: 17, type: !11, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !13)
// CHECK:STDOUT: !10 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.4d6ceefeb7f772f4", scope: null, file: !1, line: 17, type: !11, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !13)
// CHECK:STDOUT: !11 = !DISubroutineType(types: !12)
// CHECK:STDOUT: !12 = !{!7, !7}
// CHECK:STDOUT: !13 = !{!14}
// CHECK:STDOUT: !14 = !DILocalVariable(arg: 1, scope: !10, type: !7)
// CHECK:STDOUT: !15 = !DILocation(line: 19, column: 10, scope: !10)
// CHECK:STDOUT: !16 = !DILocation(line: 19, column: 3, scope: !10)
// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "G", linkageName: "_CG:enclosed.5bd8d5767580997a", scope: null, file: !1, line: 18, type: !11, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !18)
// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "G", linkageName: "_CG:enclosed.4d6ceefeb7f772f4", scope: null, file: !1, line: 18, type: !11, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !18)
// CHECK:STDOUT: !18 = !{!19}
// CHECK:STDOUT: !19 = !DILocalVariable(arg: 1, scope: !17, type: !7)
// CHECK:STDOUT: !20 = !DILocation(line: 18, column: 21, scope: !17)