Files
carbon-lang/toolchain/lower/testdata/interop/cpp/reverse/method.carbon
T
Nicholas Bishop 33d534ab31 Support calling Carbon methods from C++ (#7078)
The FunctionDecl created for calling the Carbon thunk now takes a `self`
parameter for non-static methods, and the C++ thunk now passes an extra
argument for that `self` parameter when needed.

The CXXMethodDecl thunk created for calling methods now sets the storage
class appropriate depending on whether the method is static or not.

To reduce the number of parameters being passed around to thunk-building
functions, added a `FunctionInfo` struct and pass that around instead.
2026-04-22 15:09:33 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/reverse/method.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/reverse/method.carbon
// --- method.carbon
library "[[@TEST_NAME]]";
import Cpp;
class A {
fn F[self: Self]() { self; }
}
inline Cpp '''
void CallF() {
Carbon::A().F();
}
''';
// --- method_with_args_and_return.carbon
library "[[@TEST_NAME]]";
import Cpp;
class A {
fn F[self: Self](a: i32) -> i32 {
self;
return a;
}
}
inline Cpp '''
int CallF() {
return Carbon::A().F(123);
}
''';
fn CallCallF() -> i32 { return Cpp.CallF(); }
// --- static.carbon
library "[[@TEST_NAME]]";
import Cpp;
class A {
fn F() {}
}
inline Cpp '''
void CallF() {
Carbon::A::F();
}
''';
fn CallCallF() { Cpp.CallF(); }
// CHECK:STDOUT: ; ModuleID = 'method.carbon'
// CHECK:STDOUT: source_filename = "method.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: %"class.Carbon::A" = type {}
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z5CallFv() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %ref.tmp = alloca %"class.Carbon::A", align 1
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ref.tmp) #3
// CHECK:STDOUT: call void @_ZN6Carbon1A1FEv(ptr noundef nonnull align 1 dereferenceable(1) %ref.tmp)
// CHECK:STDOUT: call void @llvm.lifetime.end.p0(ptr %ref.tmp) #3
// CHECK:STDOUT: ret void
// 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)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress nounwind uwtable
// CHECK:STDOUT: define internal void @_ZN6Carbon1A1FEv(ptr noundef nonnull align 1 dereferenceable(1) %this) #2 align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !11
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: call void @_CF__carbon_thunk.A.Main(ptr noundef nonnull align 1 dereferenceable(1) %this1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.end.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CF.A.Main(ptr %self) #3 !dbg !14 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !20
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CF__carbon_thunk.A.Main(ptr %self) #3 !dbg !21 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CF.A.Main(ptr %self), !dbg !24
// CHECK:STDOUT: ret void, !dbg !24
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #3 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// 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 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !3 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !4 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "method.carbon", directory: "")
// CHECK:STDOUT: !7 = !{!8, !8, i64 0}
// CHECK:STDOUT: !8 = !{!"int", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"omnipotent char", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !11 = !{!12, !12, i64 0}
// CHECK:STDOUT: !12 = !{!"p1 _ZTSN6Carbon1AE", !13, i64 0}
// CHECK:STDOUT: !13 = !{!"any pointer", !9, i64 0}
// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "F", linkageName: "_CF.A.Main", scope: null, file: !6, line: 6, type: !15, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !18)
// CHECK:STDOUT: !15 = !DISubroutineType(types: !16)
// CHECK:STDOUT: !16 = !{null, !17}
// CHECK:STDOUT: !17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !18 = !{!19}
// CHECK:STDOUT: !19 = !DILocalVariable(arg: 1, scope: !14, type: !17)
// CHECK:STDOUT: !20 = !DILocation(line: 6, column: 3, scope: !14)
// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "F__carbon_thunk", linkageName: "_CF__carbon_thunk.A.Main", scope: null, file: !6, line: 6, type: !15, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !22)
// CHECK:STDOUT: !22 = !{!23}
// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !21, type: !17)
// CHECK:STDOUT: !24 = !DILocation(line: 6, column: 3, scope: !21)
// CHECK:STDOUT: ; ModuleID = 'method_with_args_and_return.carbon'
// CHECK:STDOUT: source_filename = "method_with_args_and_return.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: %"class.Carbon::A" = type {}
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress uwtable
// CHECK:STDOUT: define dso_local noundef i32 @_Z5CallFv() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %ref.tmp = alloca %"class.Carbon::A", align 1
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %ref.tmp) #3
// CHECK:STDOUT: %call = call noundef i32 @_ZN6Carbon1A1FEi(ptr noundef nonnull align 1 dereferenceable(1) %ref.tmp, i32 noundef 123)
// CHECK:STDOUT: call void @llvm.lifetime.end.p0(ptr %ref.tmp) #3
// CHECK:STDOUT: ret i32 %call
// 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)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress nounwind uwtable
// CHECK:STDOUT: define internal noundef i32 @_ZN6Carbon1A1FEi(ptr noundef nonnull align 1 dereferenceable(1) %this, i32 noundef %0) #2 align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %retval = alloca i32, align 4
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: %.addr = alloca i32, align 4
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !11
// CHECK:STDOUT: store i32 %0, ptr %.addr, align 4, !tbaa !7
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: call void @_CF__carbon_thunk.A.Main(ptr noundef nonnull align 1 dereferenceable(1) %this1, ptr noundef nonnull align 4 dereferenceable(4) %.addr, ptr noundef nonnull align 4 dereferenceable(4) %retval)
// CHECK:STDOUT: %1 = load i32, ptr %retval, align 4
// CHECK:STDOUT: ret i32 %1
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.end.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CF.A.Main(ptr %self, i32 %a) #3 !dbg !14 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret i32 %a, !dbg !22
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CF__carbon_thunk.A.Main(ptr %self, ptr %_, ptr %_1) #3 !dbg !23 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc6_35.2 = load i32, ptr %_, align 4, !dbg !30
// CHECK:STDOUT: %A.F.call = call i32 @_CF.A.Main(ptr %self, i32 %.loc6_35.2), !dbg !30
// CHECK:STDOUT: store i32 %A.F.call, ptr %_1, align 4, !dbg !30
// CHECK:STDOUT: ret void, !dbg !30
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CCallCallF.Main() #3 !dbg !31 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %CallF.call = call i32 @_Z5CallFv(), !dbg !34
// CHECK:STDOUT: ret i32 %CallF.call, !dbg !35
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #3 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// 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 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !3 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !4 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "method_with_args_and_return.carbon", directory: "")
// CHECK:STDOUT: !7 = !{!8, !8, i64 0}
// CHECK:STDOUT: !8 = !{!"int", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"omnipotent char", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !11 = !{!12, !12, i64 0}
// CHECK:STDOUT: !12 = !{!"p1 _ZTSN6Carbon1AE", !13, i64 0}
// CHECK:STDOUT: !13 = !{!"any pointer", !9, i64 0}
// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "F", linkageName: "_CF.A.Main", scope: null, file: !6, line: 6, type: !15, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !19)
// CHECK:STDOUT: !15 = !DISubroutineType(types: !16)
// CHECK:STDOUT: !16 = !{!17, !18, !17}
// CHECK:STDOUT: !17 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !19 = !{!20, !21}
// CHECK:STDOUT: !20 = !DILocalVariable(arg: 1, scope: !14, type: !18)
// CHECK:STDOUT: !21 = !DILocalVariable(arg: 2, scope: !14, type: !17)
// CHECK:STDOUT: !22 = !DILocation(line: 8, column: 5, scope: !14)
// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "F__carbon_thunk", linkageName: "_CF__carbon_thunk.A.Main", scope: null, file: !6, line: 6, type: !24, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !26)
// CHECK:STDOUT: !24 = !DISubroutineType(types: !25)
// CHECK:STDOUT: !25 = !{null, !18, !17, !17}
// CHECK:STDOUT: !26 = !{!27, !28, !29}
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !23, type: !18)
// CHECK:STDOUT: !28 = !DILocalVariable(arg: 2, scope: !23, type: !17)
// CHECK:STDOUT: !29 = !DILocalVariable(arg: 3, scope: !23, type: !17)
// CHECK:STDOUT: !30 = !DILocation(line: 6, column: 3, scope: !23)
// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "CallCallF", linkageName: "_CCallCallF.Main", scope: null, file: !6, line: 18, type: !32, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !32 = !DISubroutineType(types: !33)
// CHECK:STDOUT: !33 = !{!17}
// CHECK:STDOUT: !34 = !DILocation(line: 18, column: 32, scope: !31)
// CHECK:STDOUT: !35 = !DILocation(line: 18, column: 25, scope: !31)
// CHECK:STDOUT: ; ModuleID = 'static.carbon'
// CHECK:STDOUT: source_filename = "static.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: ; Function Attrs: mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z5CallFv() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN6Carbon1A12F__cpp_thunkEv()
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress nounwind uwtable
// CHECK:STDOUT: define internal void @_ZN6Carbon1A12F__cpp_thunkEv() #1 align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CF__carbon_thunk.A.Main()
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CF.A.Main() #2 !dbg !11 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !14
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CF__carbon_thunk.A.Main() #2 !dbg !15 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CF.A.Main(), !dbg !16
// CHECK:STDOUT: ret void, !dbg !16
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CCallCallF.Main() #2 !dbg !17 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z5CallFv(), !dbg !18
// CHECK:STDOUT: ret void, !dbg !19
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #2 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// 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 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !3 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !4 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "static.carbon", directory: "")
// CHECK:STDOUT: !7 = !{!8, !8, i64 0}
// CHECK:STDOUT: !8 = !{!"int", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"omnipotent char", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "F", linkageName: "_CF.A.Main", scope: null, file: !6, line: 6, type: !12, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !12 = !DISubroutineType(types: !13)
// CHECK:STDOUT: !13 = !{null}
// CHECK:STDOUT: !14 = !DILocation(line: 6, column: 3, scope: !11)
// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "F__carbon_thunk", linkageName: "_CF__carbon_thunk.A.Main", scope: null, file: !6, line: 6, type: !12, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !16 = !DILocation(line: 6, column: 3, scope: !15)
// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "CallCallF", linkageName: "_CCallCallF.Main", scope: null, file: !6, line: 15, type: !12, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !18 = !DILocation(line: 15, column: 18, scope: !17)
// CHECK:STDOUT: !19 = !DILocation(line: 15, column: 1, scope: !17)