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carbon-lang/toolchain/lower/testdata/interop/cpp/constructor.carbon
T
Boaz Brickner 1d314c7c4d Import C++ constructors of class Type fn Type(...) -> Type (#5879) 
Only supports classes with a single (non copy non move) constructor
(without default values), until overloading is supported.

Based on #5878.

C++ Interop Demo:

```c++
// hello_world.h

#include <cstdio>

class C {
 public:
  C(int x, int y) : x_(x), y_(y) {}

  int x() const { return x_;}
  int y() const { return y_;}

 private:
  int x_;
  int y_;
};

void hello_world(C* _Nonnull c);
```

```c++
// hello_world.cpp

#include "hello_world.h"

#include <cstdio>

void hello_world(C* _Nonnull c) {
  printf("C.x = %d. C.y = %d\n", c->x(), c->y());
}
```

```carbon
// main.carbon

library "Main";

import Cpp library "hello_world.h";

fn Run() -> i32 {
  var c : Cpp.C = Cpp.C.C(1, 2);
  Cpp.hello_world(&c);
  return 0;
}
```

```shell
$ clang -c hello_world.cpp
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link hello_world.o main.o --output=demo
$ ./demo
C.x = 1. C.y = 2
```

Part of #5880.
2025-08-06 12:02:38 +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/constructor.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/constructor.carbon
// ============================================================================
// Default constructor
// ============================================================================
// --- default.h
class C {
public:
C() : x_(8), y_(9) {}
private:
int x_;
int y_;
};
// --- import_default.carbon
library "[[@TEST_NAME]]";
import Cpp library "default.h";
fn F() {
let c: Cpp.C = Cpp.C.C();
}
// CHECK:STDOUT: ; ModuleID = 'import_default.carbon'
// CHECK:STDOUT: source_filename = "import_default.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.C = type { i32, i32 }
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN1CC1Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN1CC2Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7_26.1.temp = alloca [8 x i8], align 1, !dbg !10
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 8, ptr %.loc7_26.1.temp), !dbg !10
// CHECK:STDOUT: call void @_ZN1CC1Ev(ptr %.loc7_26.1.temp), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(i64 immarg, ptr captures(none)) #0
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1CC1Ev(ptr nonnull align 4 dereferenceable(8) %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: call void @_ZN1CC2Ev(ptr nonnull align 4 dereferenceable(8) %this1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1CC2Ev(ptr nonnull align 4 dereferenceable(8) %this) unnamed_addr #2 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: %x_ = getelementptr inbounds nuw %class.C, ptr %this1, i32 0, i32 0
// CHECK:STDOUT: store i32 8, ptr %x_, align 4
// CHECK:STDOUT: %y_ = getelementptr inbounds nuw %class.C, ptr %this1, i32 0, i32 1
// CHECK:STDOUT: store i32 9, ptr %y_, align 4
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #1 = { mustprogress noinline 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: attributes #2 = { 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: "import_default.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "F", linkageName: "_CF.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: 18, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
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