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Mangle the signature decl when mangling a thunk. (#7177)

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Fixes mangling collisions when two thunks with the same name (eg, `Op`)
are created in the same context, which in turn would lead to LLVM
verifier failures and miscompiles.

To support this, add a new value store to track a little more
information about thunks beyond what's in the `Function`.
This commit is contained in:
Richard Smith
2026-05-07 21:58:29 +00:00
committed by GitHub
parent 031ec0a140
commit bc06f6c5ec
40 changed files with 637 additions and 341 deletions
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toolchain/driver/testdata/compile/optimize/optimize_debug.carbon
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@@ -120,7 +120,7 @@ fn VectorizedWithOptSpeed(a: array(i32, 65536)*) {
// CHECK:STDOUT: !22 = !DILocation(line: 18, column: 9, scope: !16)
// CHECK:STDOUT: !23 = !DILocation(line: 19, column: 5, scope: !16)
// CHECK:STDOUT: !24 = !DILocation(line: 299, column: 3, scope: !25, inlinedAt: !32)
// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk.Int.9452f4c51951679b.Core:AddAssignWith.c820bd8c65a452f9.Core.bb7b2a0b30fd4cda", scope: null, file: !26, line: 299, type: !27, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !29)
// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:AddAssignWith.808ff30fe61f0791.Core:Int.9452f4c51951679b.Core:AddAssignWith.c820bd8c65a452f9.Core.bb7b2a0b30fd4cda", scope: null, file: !26, line: 299, type: !27, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !29)
// CHECK:STDOUT: !26 = !DIFile(filename: "{{.*}}/prelude/types/int.carbon", directory: "")
// CHECK:STDOUT: !27 = !DISubroutineType(types: !28)
// CHECK:STDOUT: !28 = !{null, !7, !7}