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https://github.com/carbon-language/carbon-lang.git
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Start plumbing through debug info type information with function parameters/return value (#6410)
This adds just enough debug info for i32/int parameters and return
values, with a path forward for adding DWARF type metadata for other
types.
As it happens, return type information is carried separately from
parameter information:
* Return type information is carried in the `type` of the `DISubprogram`
(as a `DISubroutineType` - which does carry parameter type information
as well, but that's unused when the DWARF is emitted by LLVM)
* Parameter information is carried by `DILocalVariable`s with a non-zero
`arg` value (representing the order of function parameters)
In the absence of locations for the parameters (future work), nothing
would usually keep the `DILocalVariable` live/reachable when emitting
DWARF - so for cases where this can happen (for clang, this happens in
optimized builds where all references to the parameter variable might be
optimized away) the variables can be "retained" in a list on the
`DISubprogram` - achieved by passing `AlwaysPreserve` parameter to
`createParameterVariable` (adds them to a list, then that list gets
attached to the `DISubprogram` when it's finalized later)
For now, any unsupported types are emitted as `void*` (except void
return, which is implemented as void) as a placeholder.
Given this example:
```
import Core library "io";
class MyClass {
}
fn Unsupported(v: MyClass) {
}
fn Ret() -> i32 {
return 42;
}
fn Arg(x: i32) {
Core.Print(x);
}
fn Run() {
}
```
this is the resulting DWARF:
```
DW_TAG_compile_unit
DW_AT_name ("test.carbon")
DW_TAG_subprogram
DW_AT_name ("Unsupported")
DW_TAG_formal_parameter
DW_AT_type (0x00000066 "void *")
DW_TAG_subprogram
DW_AT_name ("Ret")
DW_AT_type (0x00000062 "int")
DW_TAG_subprogram
DW_AT_name ("Arg")
DW_TAG_formal_parameter
DW_AT_type (0x00000062 "int")
DW_TAG_subprogram
DW_AT_name ("Run")
DW_TAG_base_type
DW_AT_name ("int")
DW_TAG_pointer_type
```
And the debugger:
```
(gdb) p Ret()
$1 = 42
(gdb) p Arg(4)
4
$2 = void
```
I'm not sure if there's a way this logic should be merged with the logic
for making the `llvm::Function` type (which the `DISubroutineType`
building code was inspired by/copied from) - since they're done at
different times/places, I don't think there's an easy way to do it in
one pass, but maybe the code can be shared (even if it's run twice) in
some generic `SemIR::Function` type walker.
---------
Co-authored-by: Dana Jansens <danakj@orodu.net>
This commit is contained in:
David Blaikie
co-authored by
Dana Jansens
Dana Jansens
parent
0baa74d96f
commit
a179bd461b
+72
-65
@@ -78,59 +78,59 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define ptr @_CReturnNullptr.Main() #0 !dbg !15 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !16
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// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, !dbg !17
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// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !19
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// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, !dbg !20
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define ptr @_CReturnNullptrCopy.Main() #0 !dbg !18 {
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// CHECK:STDOUT: define ptr @_CReturnNullptrCopy.Main() #0 !dbg !21 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %a.var = alloca ptr, align 8, !dbg !19
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !19
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// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !20
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// CHECK:STDOUT: store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22, ptr %a.var, align 8, !dbg !19
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// CHECK:STDOUT: %.loc23 = load ptr, ptr %a.var, align 8, !dbg !21
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// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr %.loc23), !dbg !21
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// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23, !dbg !22
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// CHECK:STDOUT: %a.var = alloca ptr, align 8, !dbg !22
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !22
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// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !23
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// CHECK:STDOUT: store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22, ptr %a.var, align 8, !dbg !22
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// CHECK:STDOUT: %.loc23 = load ptr, ptr %a.var, align 8, !dbg !24
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// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr %.loc23), !dbg !24
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// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23, !dbg !25
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrIndirectly.Main() #0 !dbg !23 {
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// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrIndirectly.Main() #0 !dbg !26 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %a.var = alloca ptr, align 8, !dbg !24
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// CHECK:STDOUT: %.loc27_44.1.temp = alloca ptr, align 8, !dbg !25
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !24
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc27_44.1.temp), !dbg !25
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// CHECK:STDOUT: call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc27_44.1.temp), !dbg !25
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// CHECK:STDOUT: %.loc27_44.2 = load ptr, ptr %.loc27_44.1.temp, align 8, !dbg !25
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// CHECK:STDOUT: store ptr %.loc27_44.2, ptr %a.var, align 8, !dbg !24
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// CHECK:STDOUT: %.loc28_10 = load ptr, ptr %a.var, align 8, !dbg !26
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// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr %.loc28_10), !dbg !27
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// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !27
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrDirectly.Main() #0 !dbg !28 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %.loc32_28.1.temp = alloca ptr, align 8, !dbg !29
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc32_28.1.temp), !dbg !29
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// CHECK:STDOUT: call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc32_28.1.temp), !dbg !29
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// CHECK:STDOUT: %.loc32_28.2 = load ptr, ptr %.loc32_28.1.temp, align 8, !dbg !29
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// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr %.loc32_28.2), !dbg !30
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// CHECK:STDOUT: %a.var = alloca ptr, align 8, !dbg !27
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// CHECK:STDOUT: %.loc27_44.1.temp = alloca ptr, align 8, !dbg !28
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !27
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc27_44.1.temp), !dbg !28
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// CHECK:STDOUT: call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc27_44.1.temp), !dbg !28
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// CHECK:STDOUT: %.loc27_44.2 = load ptr, ptr %.loc27_44.1.temp, align 8, !dbg !28
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// CHECK:STDOUT: store ptr %.loc27_44.2, ptr %a.var, align 8, !dbg !27
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// CHECK:STDOUT: %.loc28_10 = load ptr, ptr %a.var, align 8, !dbg !29
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// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr %.loc28_10), !dbg !30
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// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !30
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define ptr @_CConvertNullptrConstant.Main() #0 !dbg !31 {
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// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrDirectly.Main() #0 !dbg !31 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr poison), !dbg !32
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// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !32
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// CHECK:STDOUT: %.loc32_28.1.temp = alloca ptr, align 8, !dbg !32
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc32_28.1.temp), !dbg !32
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// CHECK:STDOUT: call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc32_28.1.temp), !dbg !32
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// CHECK:STDOUT: %.loc32_28.2 = load ptr, ptr %.loc32_28.1.temp, align 8, !dbg !32
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// 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
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// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !33
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr %self) #0 !dbg !33 {
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// CHECK:STDOUT: %1 = call ptr @_CNone.Optional.Core.e49c05a5c9dc9c86(), !dbg !35
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// CHECK:STDOUT: ret ptr %1, !dbg !36
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// CHECK:STDOUT: define ptr @_CConvertNullptrConstant.Main() #0 !dbg !34 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr poison), !dbg !35
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// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !35
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4"(ptr %self) #0 !dbg !36 {
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// CHECK:STDOUT: %1 = call ptr @_CNone.Optional.Core.e49c05a5c9dc9c86(), !dbg !42
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// CHECK:STDOUT: ret ptr %1, !dbg !43
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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@@ -139,8 +139,8 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
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// CHECK:STDOUT: declare ptr @_CMake.NullptrT.CppCompat.Core()
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr ptr @_CNone.Optional.Core.e49c05a5c9dc9c86() #0 !dbg !37 {
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// CHECK:STDOUT: ret ptr null, !dbg !39
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// CHECK:STDOUT: define linkonce_odr ptr @_CNone.Optional.Core.e49c05a5c9dc9c86() #0 !dbg !44 {
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// CHECK:STDOUT: ret ptr null, !dbg !46
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
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@@ -189,34 +189,41 @@ fn ConvertNullptrConstant() -> Core.Optional(i32*) {
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// CHECK:STDOUT: !6 = !DIFile(filename: "simple.carbon", directory: "")
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// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassNullptr", linkageName: "_CPassNullptr.Main", scope: null, file: !6, line: 11, type: !8, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
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// CHECK:STDOUT: !9 = !{}
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// CHECK:STDOUT: !9 = !{null}
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// CHECK:STDOUT: !10 = !DILocation(line: 12, column: 15, scope: !7)
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// CHECK:STDOUT: !11 = !DILocation(line: 14, column: 19, scope: !7)
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// CHECK:STDOUT: !12 = !DILocation(line: 12, column: 3, scope: !7)
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// CHECK:STDOUT: !13 = !DILocation(line: 14, column: 3, scope: !7)
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// CHECK:STDOUT: !14 = !DILocation(line: 11, column: 1, scope: !7)
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// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "ReturnNullptr", linkageName: "_CReturnNullptr.Main", scope: null, file: !6, line: 17, type: !8, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !16 = !DILocation(line: 18, column: 10, scope: !15)
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// CHECK:STDOUT: !17 = !DILocation(line: 18, column: 3, scope: !15)
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// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "ReturnNullptrCopy", linkageName: "_CReturnNullptrCopy.Main", scope: null, file: !6, line: 21, type: !8, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !19 = !DILocation(line: 22, column: 3, scope: !18)
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// CHECK:STDOUT: !20 = !DILocation(line: 22, column: 26, scope: !18)
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// CHECK:STDOUT: !21 = !DILocation(line: 23, column: 10, scope: !18)
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// CHECK:STDOUT: !22 = !DILocation(line: 23, column: 3, scope: !18)
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// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "ReturnConvertedNullptrIndirectly", linkageName: "_CReturnConvertedNullptrIndirectly.Main", scope: null, file: !6, line: 26, type: !8, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !24 = !DILocation(line: 27, column: 3, scope: !23)
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// CHECK:STDOUT: !25 = !DILocation(line: 27, column: 26, scope: !23)
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// CHECK:STDOUT: !26 = !DILocation(line: 28, column: 10, scope: !23)
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// CHECK:STDOUT: !27 = !DILocation(line: 28, column: 3, scope: !23)
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// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "ReturnConvertedNullptrDirectly", linkageName: "_CReturnConvertedNullptrDirectly.Main", scope: null, file: !6, line: 31, type: !8, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !29 = !DILocation(line: 32, column: 10, scope: !28)
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// CHECK:STDOUT: !30 = !DILocation(line: 32, column: 3, scope: !28)
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// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "ConvertNullptrConstant", linkageName: "_CConvertNullptrConstant.Main", scope: null, file: !6, line: 35, type: !8, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !32 = !DILocation(line: 36, column: 3, scope: !31)
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// CHECK:STDOUT: !33 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.NullptrT.CppCompat.Core:ImplicitAs.Core.b88d1103f417c6d4", scope: null, file: !34, line: 46, type: !8, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !34 = !DIFile(filename: "{{.*}}/prelude/types/cpp/nullptr.carbon", directory: "")
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// CHECK:STDOUT: !35 = !DILocation(line: 47, column: 14, scope: !33)
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// CHECK:STDOUT: !36 = !DILocation(line: 47, column: 7, scope: !33)
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// CHECK:STDOUT: !37 = distinct !DISubprogram(name: "None", linkageName: "_CNone.Optional.Core.e49c05a5c9dc9c86", scope: null, file: !38, line: 26, type: !8, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !38 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
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// CHECK:STDOUT: !39 = !DILocation(line: 27, column: 5, scope: !37)
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// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "ReturnNullptr", linkageName: "_CReturnNullptr.Main", scope: null, file: !6, line: 17, type: !16, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !16 = !DISubroutineType(types: !17)
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// CHECK:STDOUT: !17 = !{!18}
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// CHECK:STDOUT: !18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
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// CHECK:STDOUT: !19 = !DILocation(line: 18, column: 10, scope: !15)
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// CHECK:STDOUT: !20 = !DILocation(line: 18, column: 3, scope: !15)
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// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "ReturnNullptrCopy", linkageName: "_CReturnNullptrCopy.Main", scope: null, file: !6, line: 21, type: !16, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !22 = !DILocation(line: 22, column: 3, scope: !21)
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// CHECK:STDOUT: !23 = !DILocation(line: 22, column: 26, scope: !21)
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// CHECK:STDOUT: !24 = !DILocation(line: 23, column: 10, scope: !21)
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// CHECK:STDOUT: !25 = !DILocation(line: 23, column: 3, scope: !21)
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// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "ReturnConvertedNullptrIndirectly", linkageName: "_CReturnConvertedNullptrIndirectly.Main", scope: null, file: !6, line: 26, type: !16, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !27 = !DILocation(line: 27, column: 3, scope: !26)
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// CHECK:STDOUT: !28 = !DILocation(line: 27, column: 26, scope: !26)
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// CHECK:STDOUT: !29 = !DILocation(line: 28, column: 10, scope: !26)
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// CHECK:STDOUT: !30 = !DILocation(line: 28, column: 3, scope: !26)
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// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "ReturnConvertedNullptrDirectly", linkageName: "_CReturnConvertedNullptrDirectly.Main", scope: null, file: !6, line: 31, type: !16, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !32 = !DILocation(line: 32, column: 10, scope: !31)
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// CHECK:STDOUT: !33 = !DILocation(line: 32, column: 3, scope: !31)
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// CHECK:STDOUT: !34 = distinct !DISubprogram(name: "ConvertNullptrConstant", linkageName: "_CConvertNullptrConstant.Main", scope: null, file: !6, line: 35, type: !16, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !35 = !DILocation(line: 36, column: 3, scope: !34)
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// 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)
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// CHECK:STDOUT: !37 = !DIFile(filename: "{{.*}}/prelude/types/cpp/nullptr.carbon", directory: "")
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// CHECK:STDOUT: !38 = !DISubroutineType(types: !39)
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// CHECK:STDOUT: !39 = !{!18, !18}
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// CHECK:STDOUT: !40 = !{!41}
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// CHECK:STDOUT: !41 = !DILocalVariable(arg: 1, scope: !36, type: !18)
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// CHECK:STDOUT: !42 = !DILocation(line: 47, column: 14, scope: !36)
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// CHECK:STDOUT: !43 = !DILocation(line: 47, column: 7, scope: !36)
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// CHECK:STDOUT: !44 = distinct !DISubprogram(name: "None", linkageName: "_CNone.Optional.Core.e49c05a5c9dc9c86", scope: null, file: !45, line: 26, type: !16, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !45 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
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// CHECK:STDOUT: !46 = !DILocation(line: 27, column: 5, scope: !44)
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