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b88b53e7e31a483c421e3a5bf75569b816d24fd8
carbon-lang/toolchain/lower/testdata/interop/cpp/extern_c.carbon
T
Boaz Brickner b88b53e7e3 C++ interop: Add support for importing globals (#6005) 
This supports importing globals in the global scope and within
namespaces, and support for class static data members.

C++ Interop Demo:

```c++
// my_global.h

extern int my_global;
void inc_my_global();
```

```c++
// my_global.cpp

#include "my_global.h"

int my_global = 5;

void inc_my_global() {
  ++my_global;
}
```

```carbon
// main.carbon

library "Main";

import Core library "io";
import Cpp library "my_global.h";

fn Run() -> i32 {
  Core.Print(Cpp.my_global);
  Cpp.inc_my_global();
  Core.Print(Cpp.my_global);
  return 0;
}
```

```shell
$ clang -c my_global.cpp
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link my_global.o main.o --output=demo
$ ./demo
5
6
```

Part of #6006.
2025-09-08 08:34:55 +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/extern_c.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/extern_c.carbon
// ============================================================================
// extern "C" function
// ============================================================================
// --- extern_c_function.h
extern "C" void foo();
// --- import_extern_c_function.carbon
library "[[@TEST_NAME]]";
import Cpp library "extern_c_function.h";
fn MyF() {
Cpp.foo();
}
// ============================================================================
// extern "C" variable
// ============================================================================
// --- extern_c_variable.h
extern "C" int foo;
// --- import_extern_c_variable.carbon
library "[[@TEST_NAME]]";
import Cpp library "extern_c_variable.h";
fn MyF() -> i32 {
return Cpp.foo;
}
// ============================================================================
// extern "C" function with C++ special name
// ============================================================================
// --- extern_c_with_special_name.h
struct X {};
extern "C" X operator+(X, X);
// --- import_extern_c_with_special_name.carbon
library "[[@TEST_NAME]]";
import Cpp library "extern_c_with_special_name.h";
fn MyF(a: Cpp.X, b: Cpp.X) -> Cpp.X {
return a + b;
}
// ============================================================================
// extern "C" function with asm label
// ============================================================================
// --- extern_c_with_asm_label.h
extern "C" void foo() __asm__("bar");
// --- import_extern_c_with_asm_label.carbon
library "[[@TEST_NAME]]";
import Cpp library "extern_c_with_asm_label.h";
fn MyF() {
Cpp.foo();
}
// CHECK:STDOUT: ; ModuleID = 'import_extern_c_function.carbon'
// CHECK:STDOUT: source_filename = "import_extern_c_function.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 @_CMyF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @foo(), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @foo()
// 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_extern_c_function.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.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: 6, column: 1, scope: !7)
// CHECK:STDOUT: ; ModuleID = 'import_extern_c_variable.carbon'
// CHECK:STDOUT: source_filename = "import_extern_c_variable.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: @foo = external global i32
// CHECK:STDOUT:
// CHECK:STDOUT: define i32 @_CMyF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7 = load i32, ptr @foo, align 4, !dbg !10
// CHECK:STDOUT: ret i32 %.loc7, !dbg !11
// CHECK:STDOUT: }
// 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_extern_c_variable.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.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 = 'import_extern_c_with_special_name.carbon'
// CHECK:STDOUT: source_filename = "import_extern_c_with_special_name.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.X = type { i8 }
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CMyF.Main(ptr sret({}) %return, ptr %a, ptr %b) !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Zpl1XS_.carbon_thunk(ptr %a, ptr %b, ptr %return), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Zpl1XS_(ptr sret({}), ptr, ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local void @_Zpl1XS_.carbon_thunk(ptr %0, ptr %1, ptr %return) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %.addr1 = alloca ptr, align 8
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: %agg.tmp = alloca %struct.X, align 1
// CHECK:STDOUT: %agg.tmp2 = alloca %struct.X, align 1
// CHECK:STDOUT: %undef.agg.tmp = alloca %struct.X, align 1
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8
// CHECK:STDOUT: store ptr %1, ptr %.addr1, align 8
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8
// CHECK:STDOUT: %2 = load ptr, ptr %return.addr, align 8
// CHECK:STDOUT: %3 = load ptr, ptr %.addr, align 8
// CHECK:STDOUT: %4 = load ptr, ptr %.addr1, align 8
// CHECK:STDOUT: call void @_Zpl1XS_()
// CHECK:STDOUT: ret void
// 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:
// 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_extern_c_with_special_name.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.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 = 'import_extern_c_with_asm_label.carbon'
// CHECK:STDOUT: source_filename = "import_extern_c_with_asm_label.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 @_CMyF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @bar(), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @bar()
// 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_extern_c_with_asm_label.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.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: 6, column: 1, scope: !7)
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