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Fix name mangling of generic impls (#6533)

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### Description
Mangling collisions occur when implementing interfaces with generic
parameters. The mangler does not use the specific id, causing the same
symbol `_C[FunctionName].[PackageName]:[InterfaceName].[PackageName]` to
be generated for all of the implementations below:
```carbon
// Generic interface parameters ignored
impl C as I(A)
impl C as I(B)

// Generic class parameters ignored
impl D(A) as I
impl D(B) as I

// Both ignored
impl D(A) as I(A)
impl D(B) as I(B)
```

### Changes
Updated the mangling logic for `SemIR::ClassDecl` and
`SemIR::InterfaceDecl` to include the specific id. Now the mangling
ensures unique symbols for generic implementations using the format:

`_C[FunctionName].[FunctionSpecificId].[PackageName]:[InterfaceName].[InterfaceSpecificId].[PackageName]`.

Closes #6498
This commit is contained in:
Özgür
2025-12-23 00:36:03 +00:00
committed by GitHub
parent 90f839e84e
commit 29018f38a6
23 changed files with 386 additions and 217 deletions
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toolchain/lower/testdata/interop/cpp/nullptr.carbon
Vendored
+7 -7
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@@ -59,7 +59,7 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc12_18.2.temp = alloca ptr, align 8, !dbg !10
// CHECK:STDOUT: %.loc14_22.1.temp = alloca ptr, align 8, !dbg !11
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr poison), !dbg !10
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr poison), !dbg !10
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc12_18.2.temp), !dbg !10
// CHECK:STDOUT: store ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, ptr %.loc12_18.2.temp, align 8, !dbg !10
// CHECK:STDOUT: %.loc12_18.4 = load ptr, ptr %.loc12_18.2.temp, align 8, !dbg !10
@@ -105,7 +105,7 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
// CHECK:STDOUT: %.loc27_44.2 = load ptr, ptr %.loc27_44.1.temp, align 8, !dbg !28
// CHECK:STDOUT: store ptr %.loc27_44.2, ptr %a.var, align 8, !dbg !27
// CHECK:STDOUT: %.loc28_10 = load ptr, ptr %a.var, align 8, !dbg !29
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr %.loc28_10), !dbg !30
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr %.loc28_10), !dbg !30
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !30
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -116,19 +116,19 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc32_28.1.temp), !dbg !32
// CHECK:STDOUT: call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc32_28.1.temp), !dbg !32
// CHECK:STDOUT: %.loc32_28.2 = load ptr, ptr %.loc32_28.1.temp, align 8, !dbg !32
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr %.loc32_28.2), !dbg !33
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr %.loc32_28.2), !dbg !33
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !33
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CConvertNullptrConstant.Main() #0 !dbg !34 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr poison), !dbg !35
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr poison), !dbg !35
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !35
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr %self) #0 !dbg !36 {
// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4"(ptr %self) #0 !dbg !36 {
// CHECK:STDOUT: %1 = call ptr @_CNone.Optional.Core.7bfe1822cd6dd563(), !dbg !42
// CHECK:STDOUT: ret ptr %1, !dbg !43
// CHECK:STDOUT: }
@@ -169,7 +169,7 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
// CHECK:STDOUT: declare ptr @_Z13ReturnNullptrv() #3
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4", { 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4", { 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 5, 4, 3, 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
@@ -216,7 +216,7 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
// CHECK:STDOUT: !33 = !DILocation(line: 32, column: 3, scope: !31)
// CHECK:STDOUT: !34 = distinct !DISubprogram(name: "ConvertNullptrConstant", linkageName: "_CConvertNullptrConstant.Main", scope: null, file: !6, line: 35, type: !16, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !35 = !DILocation(line: 36, column: 3, scope: !34)
// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4", scope: null, file: !37, line: 46, type: !38, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !40)
// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.NullptrT.CppCompat.Core:ImplicitAs.95db8d3a03540861.Core.b88d1103f417c6d4", scope: null, file: !37, line: 46, type: !38, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !40)
// CHECK:STDOUT: !37 = !DIFile(filename: "{{.*}}/prelude/types/cpp/nullptr.carbon", directory: "")
// CHECK:STDOUT: !38 = !DISubroutineType(types: !39)
// CHECK:STDOUT: !39 = !{!18, !18}