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a567040d77e5792c94decabe3b9c650ad3d5be5c
carbon-lang/toolchain/lower/testdata/interop/cpp/extern_c.carbon
T
Lucile Rose Nihlen a567040d77 Update LLVM to c744694c6ae1 (#8096) 
Moves Carbon code away from deprecated `llvm::IRBuilder`
and `llvm::PassBuilder` constructors  

Removes llvm patch 0002 as it landed upstream in
[#234482](https://github.com/llvm/llvm-project/pull/234482)

Removes llvm patch 0004 as it landed upstream in
[#234485](https://github.com/llvm/llvm-project/pull/234485)

Removes llvm patch 0005 as it landed upstream in
[#234489](https://github.com/llvm/llvm-project/pull/234489)

Removes llvm patch 0006 as it landed upstream in
[#234486](https://github.com/llvm/llvm-project/pull/234486)

Adds llvm patch 0013, also uploaded as an upstream
PR in [#239321](https://github.com/llvm/llvm-project/pull/239321)

Updates tests in lower and driver to suit changes to LLVM.
2026-11-05 20:33:12 +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();
}
// ============================================================================
// Overload set of extern "C" function and a C++ function
// ============================================================================
// --- extern_c_function_with_cpp_overload_set.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
extern "C" void foo();
void foo(int x);
''';
fn MyF() {
Cpp.foo();
Cpp.foo(5);
}
// ============================================================================
// extern "C" variable
// ============================================================================
// --- extern_c_variable.h
extern "C" int foo_var;
// --- import_extern_c_variable.carbon
library "[[@TEST_NAME]]";
import Cpp library "extern_c_variable.h";
fn MyF() -> i32 {
return Cpp.foo_var;
}
// ============================================================================
// 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_with_asm_label() __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_with_asm_label();
}
// CHECK:STDOUT: ; ---
// 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: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !22 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @foo(), !dbg !23
// CHECK:STDOUT: ret void, !dbg !24
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @foo() #1
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { "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:
// CHECK:STDOUT: !llvm.dbg.cu = !{!19}
// CHECK:STDOUT: !llvm.module.flags = !{!25, !26, !27, !28, !2, !3}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!33}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !18 = !DIFile(filename: "import_extern_c_function.carbon", directory: "")
// CHECK:STDOUT: !19 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !18, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !20 = !{null}
// CHECK:STDOUT: !21 = !DISubroutineType(types: !20)
// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !18, line: 6, type: !21, spFlags: DISPFlagDefinition, unit: !19)
// CHECK:STDOUT: !23 = !DILocation(line: 7, column: 3, scope: !22)
// CHECK:STDOUT: !24 = !DILocation(line: 6, column: 1, scope: !22)
// CHECK:STDOUT: !25 = !{i32 2, !"debugger-tuning", !"gdb"}
// CHECK:STDOUT: !26 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !27 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !28 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !29 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !30 = !{!"omnipotent char", !29, i64 0}
// CHECK:STDOUT: !31 = !{!"int", !30, i64 0}
// CHECK:STDOUT: !32 = !{!"__libc_errno", !31, i64 0}
// CHECK:STDOUT: !33 = !{!32, !31, i64 0}
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'extern_c_function_with_cpp_overload_set.carbon'
// CHECK:STDOUT: source_filename = "extern_c_function_with_cpp_overload_set.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: nounwind
// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !39 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @foo(), !dbg !40
// CHECK:STDOUT: call void @_Z3fooi(i32 5), !dbg !41
// CHECK:STDOUT: ret void, !dbg !42
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @foo() #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z3fooi(i32 noundef) #1
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { "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:
// CHECK:STDOUT: !llvm.dbg.cu = !{!35}
// CHECK:STDOUT: !llvm.module.flags = !{!25, !26, !27, !28, !2, !3}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!33}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !20 = !{null}
// CHECK:STDOUT: !21 = !DISubroutineType(types: !20)
// CHECK:STDOUT: !25 = !{i32 2, !"debugger-tuning", !"gdb"}
// CHECK:STDOUT: !26 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !27 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !28 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !29 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !30 = !{!"omnipotent char", !29, i64 0}
// CHECK:STDOUT: !31 = !{!"int", !30, i64 0}
// CHECK:STDOUT: !32 = !{!"__libc_errno", !31, i64 0}
// CHECK:STDOUT: !33 = !{!32, !31, i64 0}
// CHECK:STDOUT: !34 = !DIFile(filename: "extern_c_function_with_cpp_overload_set.carbon", directory: "")
// CHECK:STDOUT: !35 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !34, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !39 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !34, line: 9, type: !21, spFlags: DISPFlagDefinition, unit: !35)
// CHECK:STDOUT: !40 = !DILocation(line: 10, column: 3, scope: !39)
// CHECK:STDOUT: !41 = !DILocation(line: 11, column: 3, scope: !39)
// CHECK:STDOUT: !42 = !DILocation(line: 9, column: 1, scope: !39)
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// 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_var = external global i32, align 4
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CMyF.Main() #0 !dbg !47 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc7 = load i32, ptr @foo_var, align 4, !dbg !50
// CHECK:STDOUT: ret i32 %.loc7, !dbg !51
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!44}
// CHECK:STDOUT: !llvm.module.flags = !{!25, !26, !27, !28, !2, !3}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!33}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !25 = !{i32 2, !"debugger-tuning", !"gdb"}
// CHECK:STDOUT: !26 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !27 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !28 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !29 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !30 = !{!"omnipotent char", !29, i64 0}
// CHECK:STDOUT: !31 = !{!"int", !30, i64 0}
// CHECK:STDOUT: !32 = !{!"__libc_errno", !31, i64 0}
// CHECK:STDOUT: !33 = !{!32, !31, i64 0}
// CHECK:STDOUT: !36 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !43 = !DIFile(filename: "import_extern_c_variable.carbon", directory: "")
// CHECK:STDOUT: !44 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !43, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !45 = !{!36}
// CHECK:STDOUT: !46 = !DISubroutineType(types: !45)
// CHECK:STDOUT: !47 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !43, line: 6, type: !46, spFlags: DISPFlagDefinition, unit: !44)
// CHECK:STDOUT: !50 = !DILocation(line: 7, column: 10, scope: !47)
// CHECK:STDOUT: !51 = !DILocation(line: 7, column: 3, scope: !47)
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// 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: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CMyF.Main(ptr sret({}) %return, ptr %a, ptr %b) #0 !dbg !59 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Zpl1XS_.carbon_thunk.__(ptr %a, ptr %b, ptr %return), !dbg !66
// CHECK:STDOUT: ret void, !dbg !68
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define internal void @_Zpl1XS_.carbon_thunk.__(ptr noundef %0, ptr noundef %1, ptr noundef %return) #1 {
// 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, !tbaa !72
// CHECK:STDOUT: store ptr %1, ptr %.addr1, align 8, !tbaa !72
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !72
// CHECK:STDOUT: %2 = load ptr, ptr %return.addr, align 8, !tbaa !72
// CHECK:STDOUT: %3 = load ptr, ptr %.addr, align 8, !tbaa !72
// CHECK:STDOUT: %4 = load ptr, ptr %.addr1, align 8, !tbaa !72
// CHECK:STDOUT: call void @_Zpl1XS_()
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Zpl1XS_() #2
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { alwaysinline 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 #2 = { "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:
// CHECK:STDOUT: !llvm.dbg.cu = !{!53}
// CHECK:STDOUT: !llvm.module.flags = !{!25, !26, !27, !28, !2, !3}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!33}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !25 = !{i32 2, !"debugger-tuning", !"gdb"}
// CHECK:STDOUT: !26 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !27 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !28 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !29 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !30 = !{!"omnipotent char", !29, i64 0}
// CHECK:STDOUT: !31 = !{!"int", !30, i64 0}
// CHECK:STDOUT: !32 = !{!"__libc_errno", !31, i64 0}
// CHECK:STDOUT: !33 = !{!32, !31, i64 0}
// CHECK:STDOUT: !52 = !DIFile(filename: "import_extern_c_with_special_name.carbon", directory: "")
// CHECK:STDOUT: !53 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !52, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !54 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !55 = !{!54, !54, !54}
// CHECK:STDOUT: !56 = !DISubroutineType(types: !55)
// CHECK:STDOUT: !59 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !52, line: 6, type: !56, spFlags: DISPFlagDefinition, unit: !53, retainedNodes: !69)
// CHECK:STDOUT: !60 = !DILocalVariable(arg: 1, scope: !59, type: !54)
// CHECK:STDOUT: !61 = !DILocalVariable(arg: 2, scope: !59, type: !54)
// CHECK:STDOUT: !66 = !DILocation(line: 7, column: 10, scope: !59)
// CHECK:STDOUT: !68 = !DILocation(line: 7, column: 3, scope: !59)
// CHECK:STDOUT: !69 = !{!60, !61}
// CHECK:STDOUT: !70 = !{!"any pointer", !30, i64 0}
// CHECK:STDOUT: !71 = !{!"p1 _ZTS1X", !70, i64 0}
// CHECK:STDOUT: !72 = !{!71, !71, i64 0}
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// 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: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CMyF.Main() #0 !dbg !76 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @bar(), !dbg !77
// CHECK:STDOUT: ret void, !dbg !78
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @bar() #1
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { "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:
// CHECK:STDOUT: !llvm.dbg.cu = !{!75}
// CHECK:STDOUT: !llvm.module.flags = !{!25, !26, !27, !28, !2, !3}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!33}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !20 = !{null}
// CHECK:STDOUT: !21 = !DISubroutineType(types: !20)
// CHECK:STDOUT: !25 = !{i32 2, !"debugger-tuning", !"gdb"}
// CHECK:STDOUT: !26 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !27 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !28 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !29 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !30 = !{!"omnipotent char", !29, i64 0}
// CHECK:STDOUT: !31 = !{!"int", !30, i64 0}
// CHECK:STDOUT: !32 = !{!"__libc_errno", !31, i64 0}
// CHECK:STDOUT: !33 = !{!32, !31, i64 0}
// CHECK:STDOUT: !74 = !DIFile(filename: "import_extern_c_with_asm_label.carbon", directory: "")
// CHECK:STDOUT: !75 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !74, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !76 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !74, line: 6, type: !21, spFlags: DISPFlagDefinition, unit: !75)
// CHECK:STDOUT: !77 = !DILocation(line: 7, column: 3, scope: !76)
// CHECK:STDOUT: !78 = !DILocation(line: 6, column: 1, scope: !76)
// CHECK:STDOUT:
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