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Rudimentary name mangling support (#4267)

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This seems to be enough to avoid naming collisions for functions in any
of the current test cases (verified by asserting that the name of the
`llvm::Function` matches the name passed to create it - not triggering
LLVM's numbering that happens when names collide)

It currently implements mangling for namespace scopes, class scopes, and
impls.
Nothing generic is mangled yet - haven't looked at how that works,
though evidently it's not covered by existing testing, I guess.

Follow-up change will document the current mangling algorithm in
`toolchain/docs/lower.md`

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Co-authored-by: Carbon Infra Bot <carbon-external-infra@google.com>
This commit is contained in:
David Blaikie
2024-09-06 23:10:21 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins Carbon Infra Bot
parent 49f2136325
commit a548eff0bb
94 changed files with 657 additions and 498 deletions
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toolchain/lower/testdata/struct/nested_struct_in_place.carbon
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+5 -5
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@@ -17,15 +17,15 @@ fn G() {
// CHECK:STDOUT: ; ModuleID = 'nested_struct_in_place.carbon'
// CHECK:STDOUT: source_filename = "nested_struct_in_place.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @F(ptr sret({ i32, i32, i32 }))
// CHECK:STDOUT: declare void @_CF.Main(ptr sret({ i32, i32, i32 }))
// CHECK:STDOUT:
// CHECK:STDOUT: define void @G() !dbg !4 {
// CHECK:STDOUT: define void @_CG.Main() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %v.var = alloca { { i32, i32, i32 }, { i32, i32, i32 } }, align 8, !dbg !7
// CHECK:STDOUT: %.loc14_74.1.a = getelementptr inbounds nuw { { i32, i32, i32 }, { i32, i32, i32 } }, ptr %v.var, i32 0, i32 0, !dbg !8
// CHECK:STDOUT: call void @F(ptr %.loc14_74.1.a), !dbg !9
// CHECK:STDOUT: call void @_CF.Main(ptr %.loc14_74.1.a), !dbg !9
// CHECK:STDOUT: %.loc14_74.2.b = getelementptr inbounds nuw { { i32, i32, i32 }, { i32, i32, i32 } }, ptr %v.var, i32 0, i32 1, !dbg !8
// CHECK:STDOUT: call void @F(ptr %.loc14_74.2.b), !dbg !10
// CHECK:STDOUT: call void @_CF.Main(ptr %.loc14_74.2.b), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -36,7 +36,7 @@ fn G() {
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "nested_struct_in_place.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "G", linkageName: "G", scope: null, file: !3, line: 13, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main", scope: null, file: !3, line: 13, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 14, column: 7, scope: !4)