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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/function/call/empty_struct.carbon
Vendored
+5 -5
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@@ -19,15 +19,15 @@ fn Main() {
// CHECK:STDOUT: ; ModuleID = 'empty_struct.carbon'
// CHECK:STDOUT: source_filename = "empty_struct.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: define void @Echo() !dbg !4 {
// CHECK:STDOUT: define void @_CEcho.Main() !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !7
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define void @Main() !dbg !8 {
// CHECK:STDOUT: define void @_CMain.Main() !dbg !8 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %b.var = alloca {}, align 8, !dbg !9
// CHECK:STDOUT: call void @Echo(), !dbg !10
// CHECK:STDOUT: call void @_CEcho.Main(), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -38,11 +38,11 @@ fn Main() {
// 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: "empty_struct.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Echo", linkageName: "Echo", scope: null, file: !3, line: 11, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Echo", linkageName: "_CEcho.Main", scope: null, file: !3, line: 11, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{}
// CHECK:STDOUT: !7 = !DILocation(line: 12, column: 3, scope: !4)
// CHECK:STDOUT: !8 = distinct !DISubprogram(name: "Main", linkageName: "Main", scope: null, file: !3, line: 15, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !8 = distinct !DISubprogram(name: "Main", linkageName: "_CMain.Main", scope: null, file: !3, line: 15, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !9 = !DILocation(line: 16, column: 7, scope: !8)
// CHECK:STDOUT: !10 = !DILocation(line: 16, column: 15, scope: !8)
// CHECK:STDOUT: !11 = !DILocation(line: 15, column: 1, scope: !8)