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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/array/function_param.carbon
Vendored
+5 -5
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@@ -21,21 +21,21 @@ fn G() -> i32 {
// CHECK:STDOUT:
// CHECK:STDOUT: @array.loc16_11.1 = internal constant [3 x i32] [i32 1, i32 2, i32 3]
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @F(ptr %arr, i32 %i) !dbg !4 {
// CHECK:STDOUT: define i32 @_CF.Main(ptr %arr, i32 %i) !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc12_15.2.array.index = getelementptr inbounds [3 x i32], ptr %arr, i32 0, i32 %i, !dbg !7
// CHECK:STDOUT: %.loc12_15.3 = load i32, ptr %.loc12_15.2.array.index, align 4, !dbg !7
// CHECK:STDOUT: ret i32 %.loc12_15.3, !dbg !8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @G() !dbg !9 {
// CHECK:STDOUT: define i32 @_CG.Main() !dbg !9 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc16_20.2.temp = alloca [3 x i32], align 4, !dbg !10
// CHECK:STDOUT: %.loc16_20.4.array.index = getelementptr inbounds [3 x i32], ptr %.loc16_20.2.temp, i32 0, i32 0, !dbg !10
// CHECK:STDOUT: %.loc16_20.7.array.index = getelementptr inbounds [3 x i32], ptr %.loc16_20.2.temp, i32 0, i32 1, !dbg !10
// CHECK:STDOUT: %.loc16_20.10.array.index = getelementptr inbounds [3 x i32], ptr %.loc16_20.2.temp, i32 0, i32 2, !dbg !10
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %.loc16_20.2.temp, ptr align 4 @array.loc16_11.1, i64 12, i1 false), !dbg !11
// CHECK:STDOUT: %F.call = call i32 @F(ptr %.loc16_20.2.temp, i32 1), !dbg !11
// CHECK:STDOUT: %F.call = call i32 @_CF.Main(ptr %.loc16_20.2.temp, i32 1), !dbg !11
// CHECK:STDOUT: ret i32 %F.call, !dbg !12
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -51,12 +51,12 @@ fn G() -> i32 {
// 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: "function_param.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "F", linkageName: "F", scope: null, file: !3, line: 11, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "F", linkageName: "_CF.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: 10, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 12, column: 3, scope: !4)
// CHECK:STDOUT: !9 = distinct !DISubprogram(name: "G", linkageName: "G", scope: null, file: !3, line: 15, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !9 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main", scope: null, file: !3, line: 15, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !10 = !DILocation(line: 16, column: 12, scope: !9)
// CHECK:STDOUT: !11 = !DILocation(line: 16, column: 10, scope: !9)
// CHECK:STDOUT: !12 = !DILocation(line: 16, column: 3, scope: !9)