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Canonicalize generated functions for Core witnesses (#7729)

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Use a single `SemIR::Function` per `Core` interface method, whether it's
generated locally or imported. This prevents generating duplicate
functions, which lead to different types when the witness appears in a
`FacetValue` as part of a specific for a class.

We use a `CanonicalValueStore` of `GeneratedFunction` objects that allow
finding an existing FunctionId for a `Generated` special function before
(re-)generating it. Mangling for `Generated` functions is also moved to
use the values from the `GeneratedFunction`'s canonicalization key, so
that we have a consistent source of truth for the unique ID of a
`Generated` function across all files.

New tests are in
`toolchain/check/testdata/impl/custom_witness/destroy.carbon`.
This commit is contained in:
Dana Jansens
2026-09-15 16:02:13 +00:00
committed by GitHub
parent db2e26ba86
commit 4416f3525b
278 changed files with 5941 additions and 5506 deletions
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toolchain/lower/testdata/pointer/basic.carbon
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+3 -3
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@@ -37,12 +37,12 @@ fn F() -> i32 {
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !40
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !40
// CHECK:STDOUT: %G.call = call i32 @_CG.Main(ptr %n.var), !dbg !44
// CHECK:STDOUT: call void @"_COp.70db2d92ffddbef7:core.Destroy.Core"(ptr %n.var), !dbg !40
// CHECK:STDOUT: call void @"_COp.f58524831c37807e:core.Destroy.Core"(ptr %n.var), !dbg !40
// CHECK:STDOUT: ret i32 %G.call, !dbg !45
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.70db2d92ffddbef7:core.Destroy.Core"(ptr %self) #0 !dbg !46 {
// CHECK:STDOUT: define weak_odr void @"_COp.f58524831c37807e:core.Destroy.Core"(ptr %self) #0 !dbg !46 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !48
// CHECK:STDOUT: }
@@ -77,7 +77,7 @@ fn F() -> i32 {
// CHECK:STDOUT: !40 = !DILocation(line: 18, column: 3, scope: !37)
// CHECK:STDOUT: !44 = !DILocation(line: 19, column: 10, scope: !37)
// CHECK:STDOUT: !45 = !DILocation(line: 19, column: 3, scope: !37)
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "Op", linkageName: "_COp.70db2d92ffddbef7:core.Destroy.Core", scope: null, file: !18, line: 18, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !49)
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "Op", linkageName: "_COp.f58524831c37807e:core.Destroy.Core", scope: null, file: !18, line: 18, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !49)
// CHECK:STDOUT: !47 = !DILocalVariable(arg: 1, scope: !46, type: !20)
// CHECK:STDOUT: !48 = !DILocation(line: 18, column: 3, scope: !46)
// CHECK:STDOUT: !49 = !{!47}