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carbon-lang/toolchain/lower/testdata/interop/cpp/method.carbon
T
Richard SmithandJon Ross-Perkins 1e7b7e53ae C++ interop: support for default arguments. (#6108) 
The general strategy here is to force use of a thunk when we want to use
default arguments, and have Clang generate uses of the default arguments
on its side of the thunk.

To support this, change the key type used in `clang_decls` from being
just a `Decl*` to being a pair of `Decl*` and number of parameters in
the case of function decls. Import distinct `SemIR::Function`s for each
number of parameters that's used, and corresponding distinct thunks.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
2025-09-24 01:07:59 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/int.carbon
// EXTRA-ARGS: --clang-arg=-std=c++26
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/method.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/method.carbon
// --- methods.h
struct Base {
virtual void virt0();
};
struct A: Base {
int by_val() const { return n; }
int by_ref() { return n; }
virtual void virt1();
int n;
};
// --- call_by_val.carbon
library "[[@TEST_NAME]]";
import Cpp library "methods.h";
fn UseVal(a: Cpp.A) -> i32 {
return a.by_val();
}
// --- call_by_ref.carbon
library "[[@TEST_NAME]]";
import Cpp library "methods.h";
fn UseVal(a: Cpp.A*) -> i32 {
return a->by_ref();
}
// --- call_virtual.carbon
library "[[@TEST_NAME]]";
import Cpp library "methods.h";
fn UseVal(a: Cpp.A*) {
a->virt0();
a->virt1();
}
// --- thunk.h
struct NeedThunk {
void Implicit(signed char c) const;
void Explicit(this NeedThunk, signed char c);
};
// --- call_thunk.carbon
library "[[@TEST_NAME]]";
import Cpp library "thunk.h";
fn Call(n: Cpp.NeedThunk) {
n.Implicit(1);
n.Explicit(1);
}
// CHECK:STDOUT: ; ModuleID = 'call_by_val.carbon'
// CHECK:STDOUT: source_filename = "call_by_val.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: %struct.A = type <{ %struct.Base, i32, [4 x i8] }>
// CHECK:STDOUT: %struct.Base = type { ptr }
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZNK1A6by_valEv = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @_CUseVal.Main(ptr %a) !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %by_val__carbon_thunk.call = call i32 @_ZNK1A6by_valEv.carbon_thunk(ptr %a), !dbg !10
// CHECK:STDOUT: ret i32 %by_val__carbon_thunk.call, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local i32 @_ZNK1A6by_valEv.carbon_thunk(ptr %this) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8
// CHECK:STDOUT: %0 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: %call = call i32 @_ZNK1A6by_valEv(ptr nonnull align 8 dereferenceable(12) %0)
// CHECK:STDOUT: ret i32 %call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr dso_local i32 @_ZNK1A6by_valEv(ptr nonnull align 8 dereferenceable(12) %this) #1 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: %n = getelementptr inbounds nuw %struct.A, ptr %this1, i32 0, i32 1
// CHECK:STDOUT: %0 = load i32, ptr %n, align 8
// CHECK:STDOUT: ret i32 %0
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #1 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "call_by_val.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "UseVal", linkageName: "_CUseVal.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 10, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: ; ModuleID = 'call_by_ref.carbon'
// CHECK:STDOUT: source_filename = "call_by_ref.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: %struct.A = type <{ %struct.Base, i32, [4 x i8] }>
// CHECK:STDOUT: %struct.Base = type { ptr }
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN1A6by_refEv = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @_CUseVal.Main(ptr %a) !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %A.by_ref.call = call i32 @_ZN1A6by_refEv(ptr %a), !dbg !10
// CHECK:STDOUT: ret i32 %A.by_ref.call, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr dso_local i32 @_ZN1A6by_refEv(ptr nonnull align 8 dereferenceable(12) %this) #0 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: %n = getelementptr inbounds nuw %struct.A, ptr %this1, i32 0, i32 1
// CHECK:STDOUT: %0 = load i32, ptr %n, align 8
// CHECK:STDOUT: ret i32 %0
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "call_by_ref.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "UseVal", linkageName: "_CUseVal.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 10, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: ; ModuleID = 'call_virtual.carbon'
// CHECK:STDOUT: source_filename = "call_virtual.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CUseVal.Main(ptr %a) !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7_4.3.base = getelementptr inbounds nuw [16 x i8], ptr %a, i32 0, i32 0, !dbg !10
// CHECK:STDOUT: %Base.virt0.call.vtable = load ptr, ptr %.loc7_4.3.base, align 8, !dbg !10
// CHECK:STDOUT: %Base.virt0.call = getelementptr ptr, ptr %Base.virt0.call.vtable, i32 0, !dbg !10
// CHECK:STDOUT: %Base.virt0.call.memptr.virtualfn = load ptr, ptr %Base.virt0.call, align 8, !dbg !10
// CHECK:STDOUT: call void %Base.virt0.call.memptr.virtualfn(ptr %.loc7_4.3.base), !dbg !10
// CHECK:STDOUT: %A.virt1.call.vtable = load ptr, ptr %a, align 8, !dbg !11
// CHECK:STDOUT: %A.virt1.call = getelementptr ptr, ptr %A.virt1.call.vtable, i32 1, !dbg !11
// CHECK:STDOUT: %A.virt1.call.memptr.virtualfn = load ptr, ptr %A.virt1.call, align 8, !dbg !11
// CHECK:STDOUT: call void %A.virt1.call.memptr.virtualfn(ptr %a), !dbg !11
// CHECK:STDOUT: ret void, !dbg !12
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZN4Base5virt0Ev(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZN1A5virt1Ev(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "call_virtual.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "UseVal", linkageName: "_CUseVal.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 3, scope: !7)
// CHECK:STDOUT: !12 = !DILocation(line: 6, column: 1, scope: !7)
// CHECK:STDOUT: ; ModuleID = 'call_thunk.carbon'
// CHECK:STDOUT: source_filename = "call_thunk.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: %struct.NeedThunk = type { i8 }
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CCall.Main(ptr %n) !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7_14.3.temp = alloca i8, align 1, !dbg !10
// CHECK:STDOUT: %.loc8_14.3.temp = alloca i8, align 1, !dbg !11
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc7_14.3.temp), !dbg !10
// CHECK:STDOUT: store i8 1, ptr %.loc7_14.3.temp, align 1, !dbg !10
// CHECK:STDOUT: call void @_ZNK9NeedThunk8ImplicitEa.carbon_thunk(ptr %n, ptr %.loc7_14.3.temp), !dbg !12
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc8_14.3.temp), !dbg !11
// CHECK:STDOUT: store i8 1, ptr %.loc8_14.3.temp, align 1, !dbg !11
// CHECK:STDOUT: call void @_ZNH9NeedThunk8ExplicitES_a.carbon_thunk(ptr %n, ptr %.loc8_14.3.temp), !dbg !13
// CHECK:STDOUT: ret void, !dbg !14
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #0
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local void @_ZNK9NeedThunk8ImplicitEa.carbon_thunk(ptr %this, ptr %c) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: %c.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8
// CHECK:STDOUT: store ptr %c, ptr %c.addr, align 8
// CHECK:STDOUT: %0 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: %1 = load ptr, ptr %c.addr, align 8
// CHECK:STDOUT: %2 = load i8, ptr %1, align 1
// CHECK:STDOUT: call void @_ZNK9NeedThunk8ImplicitEa(ptr nonnull align 1 dereferenceable(1) %0, i8 signext %2)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZNK9NeedThunk8ImplicitEa(ptr nonnull align 1 dereferenceable(1), i8 signext) #2
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local void @_ZNH9NeedThunk8ExplicitES_a.carbon_thunk(ptr %0, ptr %c) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %c.addr = alloca ptr, align 8
// CHECK:STDOUT: %agg.tmp = alloca %struct.NeedThunk, align 1
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8
// CHECK:STDOUT: store ptr %c, ptr %c.addr, align 8
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8
// CHECK:STDOUT: %2 = load ptr, ptr %c.addr, align 8
// CHECK:STDOUT: %3 = load i8, ptr %2, align 1
// CHECK:STDOUT: call void @_ZNH9NeedThunk8ExplicitES_a(i8 signext %3)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZNH9NeedThunk8ExplicitES_a(i8 signext) #2
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "call_thunk.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 14, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 14, scope: !7)
// CHECK:STDOUT: !12 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !13 = !DILocation(line: 8, column: 3, scope: !7)
// CHECK:STDOUT: !14 = !DILocation(line: 6, column: 1, scope: !7)
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