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773b7136ef3d0aca49c69abcdaac972326e5ea55
carbon-lang/toolchain/lower/testdata/interop/cpp/reference.carbon
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David Blaikie 773b7136ef Use a single llvm::Module for C++ interop and Carbon IRGen (#6595) 
Some module metadata changed - because rather than linking one module
with one module metadata value (eg: PIC Level 0, or unspecified) and one
module with a different one (PIC level 2, in clang) - we use Clang's
Module as-is, no merging required, so Clang's module metadata sticks
rather than being merged with default values from Carbon.

Also tweaked the name we use for Clang's module name so it matches the
carbon file name.

Otherwise the IR changes seem to be just reorderings - C++ interop goes
first, then Carbon, rather than the other way around.
2026-01-17 00:15:53 +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/reference.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/reference.carbon
// ============================================================================
// Reference params
// ============================================================================
// --- pass_references.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
class C {};
auto TakeCRef(C&) -> void;
auto TakeCRRef(C&&) -> void;
auto TakeConstCRef(const C&) -> void;
auto TakeIntRef(int&) -> void;
auto TakeIntRRef(int&&) -> void;
auto TakeConstIntRef(const int&) -> void;
''';
fn PassRefs() {
var c: Cpp.C;
Cpp.TakeCRef(ref c);
Cpp.TakeCRRef({} as Cpp.C);
Cpp.TakeConstCRef(c);
var n: i32;
Cpp.TakeIntRef(ref n);
Cpp.TakeIntRRef(42 as i32);
Cpp.TakeConstIntRef(n);
}
// --- pass_references_via_thunk.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
class C {};
class ForceThunk {};
auto TakeCRef(C&, ForceThunk = {}) -> void;
auto TakeCRRef(const C&, ForceThunk = {}) -> void;
auto TakeConstCRef(const C&, ForceThunk = {}) -> void;
auto TakeIntRef(int&, ForceThunk = {}) -> void;
auto TakeIntRRef(int&&, ForceThunk = {}) -> void;
auto TakeConstIntRef(const int&, ForceThunk = {}) -> void;
''';
fn PassRefs() {
var c: Cpp.C;
Cpp.TakeCRef(ref c);
Cpp.TakeCRRef({} as Cpp.C);
Cpp.TakeConstCRef(c);
var n: i32;
Cpp.TakeIntRef(ref n);
Cpp.TakeIntRRef(42 as i32);
Cpp.TakeConstIntRef(n);
}
// ============================================================================
// Reference return values
// ============================================================================
// --- return_references.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
class C {};
auto ReturnCRef() -> C&;
auto ReturnCRRef() -> C&&;
auto ReturnConstCRef() -> const C&;
auto ReturnIntRef() -> int&;
auto ReturnIntRRef() -> int&&;
auto ReturnConstIntRef() -> const int&;
''';
fn GetRefs() {
let ref _: Cpp.C = Cpp.ReturnCRef();
let ref _: Cpp.C = Cpp.ReturnCRRef();
let ref _: const Cpp.C = Cpp.ReturnConstCRef();
let ref _: i32 = Cpp.ReturnIntRef();
let ref _: i32 = Cpp.ReturnIntRRef();
let ref _: const i32 = Cpp.ReturnConstIntRef();
}
// --- return_references_via_thunk.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
class C {};
class ForceThunk {};
auto ReturnCRef(ForceThunk = {}) -> C&;
auto ReturnCRRef(ForceThunk = {}) -> C&&;
auto ReturnConstCRef(ForceThunk = {}) -> const C&;
auto ReturnIntRef(ForceThunk = {}) -> int&;
auto ReturnIntRRef(ForceThunk = {}) -> int&&;
auto ReturnConstIntRef(ForceThunk = {}) -> const int&;
''';
fn GetRefs() {
let ref _: Cpp.C = Cpp.ReturnCRef();
let ref _: Cpp.C = Cpp.ReturnCRRef();
let ref _: const Cpp.C = Cpp.ReturnConstCRef();
let ref _: i32 = Cpp.ReturnIntRef();
let ref _: i32 = Cpp.ReturnIntRRef();
let ref _: const i32 = Cpp.ReturnConstIntRef();
}
// CHECK:STDOUT: ; ModuleID = 'pass_references.carbon'
// CHECK:STDOUT: source_filename = "pass_references.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: @C.val.loc19_18.3 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z9TakeCRRefO1C.carbon_thunk(ptr noundef %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !12
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !12
// CHECK:STDOUT: call void @_Z9TakeCRRefO1C(ptr noundef nonnull align 1 dereferenceable(1) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z9TakeCRRefO1C(ptr noundef nonnull align 1 dereferenceable(1)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z13TakeConstCRefRK1C.carbon_thunk(ptr noundef %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !12
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !12
// CHECK:STDOUT: call void @_Z13TakeConstCRefRK1C(ptr noundef nonnull align 1 dereferenceable(1) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z13TakeConstCRefRK1C(ptr noundef nonnull align 1 dereferenceable(1)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z11TakeIntRRefOi.carbon_thunk(ptr noundef %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !15
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !15
// CHECK:STDOUT: call void @_Z11TakeIntRRefOi(ptr noundef nonnull align 4 dereferenceable(4) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z11TakeIntRRefOi(ptr noundef nonnull align 4 dereferenceable(4)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z15TakeConstIntRefRKi.carbon_thunk(ptr noundef %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !15
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !15
// CHECK:STDOUT: call void @_Z15TakeConstIntRefRKi(ptr noundef nonnull align 4 dereferenceable(4) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z15TakeConstIntRefRKi(ptr noundef nonnull align 4 dereferenceable(4)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CPassRefs.Main() #2 !dbg !17 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %c.var = alloca {}, align 8, !dbg !20
// CHECK:STDOUT: %.loc19_18.2.temp = alloca {}, align 8, !dbg !21
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !22
// CHECK:STDOUT: %.loc24_22.3.temp = alloca i32, align 4, !dbg !23
// CHECK:STDOUT: %.loc25_23.2.temp = alloca i32, align 4, !dbg !24
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !20
// CHECK:STDOUT: call void @_Z8TakeCRefR1C(ptr %c.var), !dbg !25
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc19_18.2.temp), !dbg !21
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc19_18.2.temp, ptr align 1 @C.val.loc19_18.3, i64 0, i1 false), !dbg !21
// CHECK:STDOUT: call void @_Z9TakeCRRefO1C.carbon_thunk(ptr %.loc19_18.2.temp), !dbg !26
// CHECK:STDOUT: call void @_Z13TakeConstCRefRK1C.carbon_thunk(ptr %c.var), !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !22
// CHECK:STDOUT: call void @_Z10TakeIntRefRi(ptr %n.var), !dbg !28
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc24_22.3.temp), !dbg !23
// CHECK:STDOUT: store i32 42, ptr %.loc24_22.3.temp, align 4, !dbg !23
// CHECK:STDOUT: call void @_Z11TakeIntRRefOi.carbon_thunk(ptr %.loc24_22.3.temp), !dbg !29
// CHECK:STDOUT: %.loc25_23.1 = load i32, ptr %n.var, align 4, !dbg !24
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc25_23.2.temp), !dbg !24
// CHECK:STDOUT: store i32 %.loc25_23.1, ptr %.loc25_23.2.temp, align 4, !dbg !24
// CHECK:STDOUT: call void @_Z15TakeConstIntRefRKi.carbon_thunk(ptr %.loc25_23.2.temp), !dbg !30
// CHECK:STDOUT: ret void, !dbg !31
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z8TakeCRefR1C(ptr noundef nonnull align 1 dereferenceable(1)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z10TakeIntRefRi(ptr noundef nonnull align 4 dereferenceable(4)) #1
// 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)) #3
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #4
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 4, 3, 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { 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 #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: attributes #2 = { nounwind }
// CHECK:STDOUT: attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #4 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
// 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 2}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !7 = !DIFile(filename: "pass_references.carbon", directory: "")
// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !12 = !{!13, !13, i64 0}
// CHECK:STDOUT: !13 = !{!"p1 _ZTS1C", !14, i64 0}
// CHECK:STDOUT: !14 = !{!"any pointer", !10, i64 0}
// CHECK:STDOUT: !15 = !{!16, !16, i64 0}
// CHECK:STDOUT: !16 = !{!"p1 int", !14, i64 0}
// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "PassRefs", linkageName: "_CPassRefs.Main", scope: null, file: !7, line: 16, type: !18, spFlags: DISPFlagDefinition, unit: !6)
// CHECK:STDOUT: !18 = !DISubroutineType(types: !19)
// CHECK:STDOUT: !19 = !{null}
// CHECK:STDOUT: !20 = !DILocation(line: 17, column: 3, scope: !17)
// CHECK:STDOUT: !21 = !DILocation(line: 19, column: 17, scope: !17)
// CHECK:STDOUT: !22 = !DILocation(line: 22, column: 3, scope: !17)
// CHECK:STDOUT: !23 = !DILocation(line: 24, column: 19, scope: !17)
// CHECK:STDOUT: !24 = !DILocation(line: 25, column: 23, scope: !17)
// CHECK:STDOUT: !25 = !DILocation(line: 18, column: 3, scope: !17)
// CHECK:STDOUT: !26 = !DILocation(line: 19, column: 3, scope: !17)
// CHECK:STDOUT: !27 = !DILocation(line: 20, column: 3, scope: !17)
// CHECK:STDOUT: !28 = !DILocation(line: 23, column: 3, scope: !17)
// CHECK:STDOUT: !29 = !DILocation(line: 24, column: 3, scope: !17)
// CHECK:STDOUT: !30 = !DILocation(line: 25, column: 3, scope: !17)
// CHECK:STDOUT: !31 = !DILocation(line: 16, column: 1, scope: !17)
// CHECK:STDOUT: ; ModuleID = 'pass_references_via_thunk.carbon'
// CHECK:STDOUT: source_filename = "pass_references_via_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: %class.ForceThunk = type { i8 }
// CHECK:STDOUT:
// CHECK:STDOUT: @C.val.loc20_18.3 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z8TakeCRefR1C10ForceThunk.carbon_thunk1(ptr noundef nonnull align 1 dereferenceable(1) %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !12
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !12, !nonnull !15
// CHECK:STDOUT: call void @_Z8TakeCRefR1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z8TakeCRefR1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z9TakeCRRefRK1C10ForceThunk.carbon_thunk1(ptr noundef %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !12
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !12
// CHECK:STDOUT: call void @_Z9TakeCRRefRK1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z9TakeCRRefRK1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z13TakeConstCRefRK1C10ForceThunk.carbon_thunk1(ptr noundef %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !12
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !12
// CHECK:STDOUT: call void @_Z13TakeConstCRefRK1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z13TakeConstCRefRK1C10ForceThunk(ptr noundef nonnull align 1 dereferenceable(1)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z10TakeIntRefRi10ForceThunk.carbon_thunk1(ptr noundef nonnull align 4 dereferenceable(4) %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !16
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !16, !nonnull !15, !align !18
// CHECK:STDOUT: call void @_Z10TakeIntRefRi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z10TakeIntRefRi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z11TakeIntRRefOi10ForceThunk.carbon_thunk1(ptr noundef %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !16
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !16
// CHECK:STDOUT: call void @_Z11TakeIntRRefOi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z11TakeIntRRefOi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local void @_Z15TakeConstIntRefRKi10ForceThunk.carbon_thunk1(ptr noundef %0) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !16
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8, !tbaa !16
// CHECK:STDOUT: call void @_Z15TakeConstIntRefRKi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4) %1)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z15TakeConstIntRefRKi10ForceThunk(ptr noundef nonnull align 4 dereferenceable(4)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CPassRefs.Main() #2 !dbg !19 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %c.var = alloca {}, align 8, !dbg !22
// CHECK:STDOUT: %.loc20_18.2.temp = alloca {}, align 8, !dbg !23
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !24
// CHECK:STDOUT: %.loc25_22.3.temp = alloca i32, align 4, !dbg !25
// CHECK:STDOUT: %.loc26_23.2.temp = alloca i32, align 4, !dbg !26
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !22
// CHECK:STDOUT: call void @_Z8TakeCRefR1C10ForceThunk.carbon_thunk1(ptr %c.var), !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc20_18.2.temp), !dbg !23
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %.loc20_18.2.temp, ptr align 1 @C.val.loc20_18.3, i64 0, i1 false), !dbg !23
// CHECK:STDOUT: call void @_Z9TakeCRRefRK1C10ForceThunk.carbon_thunk1(ptr %.loc20_18.2.temp), !dbg !28
// CHECK:STDOUT: call void @_Z13TakeConstCRefRK1C10ForceThunk.carbon_thunk1(ptr %c.var), !dbg !29
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !24
// CHECK:STDOUT: call void @_Z10TakeIntRefRi10ForceThunk.carbon_thunk1(ptr %n.var), !dbg !30
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc25_22.3.temp), !dbg !25
// CHECK:STDOUT: store i32 42, ptr %.loc25_22.3.temp, align 4, !dbg !25
// CHECK:STDOUT: call void @_Z11TakeIntRRefOi10ForceThunk.carbon_thunk1(ptr %.loc25_22.3.temp), !dbg !31
// CHECK:STDOUT: %.loc26_23.1 = load i32, ptr %n.var, align 4, !dbg !26
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc26_23.2.temp), !dbg !26
// CHECK:STDOUT: store i32 %.loc26_23.1, ptr %.loc26_23.2.temp, align 4, !dbg !26
// CHECK:STDOUT: call void @_Z15TakeConstIntRefRKi10ForceThunk.carbon_thunk1(ptr %.loc26_23.2.temp), !dbg !32
// CHECK:STDOUT: ret void, !dbg !33
// 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)) #3
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #4
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 4, 3, 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { 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 #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: attributes #2 = { nounwind }
// CHECK:STDOUT: attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #4 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
// 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 2}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !7 = !DIFile(filename: "pass_references_via_thunk.carbon", directory: "")
// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !12 = !{!13, !13, i64 0}
// CHECK:STDOUT: !13 = !{!"p1 _ZTS1C", !14, i64 0}
// CHECK:STDOUT: !14 = !{!"any pointer", !10, i64 0}
// CHECK:STDOUT: !15 = !{}
// CHECK:STDOUT: !16 = !{!17, !17, i64 0}
// CHECK:STDOUT: !17 = !{!"p1 int", !14, i64 0}
// CHECK:STDOUT: !18 = !{i64 4}
// CHECK:STDOUT: !19 = distinct !DISubprogram(name: "PassRefs", linkageName: "_CPassRefs.Main", scope: null, file: !7, line: 17, type: !20, spFlags: DISPFlagDefinition, unit: !6)
// CHECK:STDOUT: !20 = !DISubroutineType(types: !21)
// CHECK:STDOUT: !21 = !{null}
// CHECK:STDOUT: !22 = !DILocation(line: 18, column: 3, scope: !19)
// CHECK:STDOUT: !23 = !DILocation(line: 20, column: 17, scope: !19)
// CHECK:STDOUT: !24 = !DILocation(line: 23, column: 3, scope: !19)
// CHECK:STDOUT: !25 = !DILocation(line: 25, column: 19, scope: !19)
// CHECK:STDOUT: !26 = !DILocation(line: 26, column: 23, scope: !19)
// CHECK:STDOUT: !27 = !DILocation(line: 19, column: 3, scope: !19)
// CHECK:STDOUT: !28 = !DILocation(line: 20, column: 3, scope: !19)
// CHECK:STDOUT: !29 = !DILocation(line: 21, column: 3, scope: !19)
// CHECK:STDOUT: !30 = !DILocation(line: 24, column: 3, scope: !19)
// CHECK:STDOUT: !31 = !DILocation(line: 25, column: 3, scope: !19)
// CHECK:STDOUT: !32 = !DILocation(line: 26, column: 3, scope: !19)
// CHECK:STDOUT: !33 = !DILocation(line: 17, column: 1, scope: !19)
// CHECK:STDOUT: ; ModuleID = 'return_references.carbon'
// CHECK:STDOUT: source_filename = "return_references.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 @_CGetRefs.Main() #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %ReturnCRef.call = call ptr @_Z10ReturnCRefv(), !dbg !15
// CHECK:STDOUT: %ReturnCRRef.call = call ptr @_Z11ReturnCRRefv(), !dbg !16
// CHECK:STDOUT: %ReturnConstCRef.call = call ptr @_Z15ReturnConstCRefv(), !dbg !17
// CHECK:STDOUT: %ReturnIntRef.call = call ptr @_Z12ReturnIntRefv(), !dbg !18
// CHECK:STDOUT: %ReturnIntRRef.call = call ptr @_Z13ReturnIntRRefv(), !dbg !19
// CHECK:STDOUT: %ReturnConstIntRef.call = call ptr @_Z17ReturnConstIntRefv(), !dbg !20
// CHECK:STDOUT: ret void, !dbg !21
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRefv() #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRefv() #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRefv() #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRefv() #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRefv() #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRefv() #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.module.flags = !{!0, !1, !2, !3, !4, !5}
// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
// 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 2}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !7 = !DIFile(filename: "return_references.carbon", directory: "")
// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "GetRefs", linkageName: "_CGetRefs.Main", scope: null, file: !7, line: 16, type: !13, spFlags: DISPFlagDefinition, unit: !6)
// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
// CHECK:STDOUT: !14 = !{null}
// CHECK:STDOUT: !15 = !DILocation(line: 17, column: 22, scope: !12)
// CHECK:STDOUT: !16 = !DILocation(line: 18, column: 22, scope: !12)
// CHECK:STDOUT: !17 = !DILocation(line: 19, column: 28, scope: !12)
// CHECK:STDOUT: !18 = !DILocation(line: 21, column: 20, scope: !12)
// CHECK:STDOUT: !19 = !DILocation(line: 22, column: 20, scope: !12)
// CHECK:STDOUT: !20 = !DILocation(line: 23, column: 26, scope: !12)
// CHECK:STDOUT: !21 = !DILocation(line: 16, column: 1, scope: !12)
// CHECK:STDOUT: ; ModuleID = 'return_references_via_thunk.carbon'
// CHECK:STDOUT: source_filename = "return_references_via_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: %class.ForceThunk = type { i8 }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRef10ForceThunk.carbon_thunk0() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: %call = call noundef nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRef10ForceThunk()
// CHECK:STDOUT: ret ptr %call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 1 dereferenceable(1) ptr @_Z10ReturnCRef10ForceThunk() #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRef10ForceThunk.carbon_thunk0() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: %call = call noundef nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRef10ForceThunk()
// CHECK:STDOUT: ret ptr %call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 1 dereferenceable(1) ptr @_Z11ReturnCRRef10ForceThunk() #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRef10ForceThunk.carbon_thunk0() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: %call = call noundef nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRef10ForceThunk()
// CHECK:STDOUT: ret ptr %call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 1 dereferenceable(1) ptr @_Z15ReturnConstCRef10ForceThunk() #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local noundef nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRef10ForceThunk.carbon_thunk0() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: %call = call noundef nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRef10ForceThunk()
// CHECK:STDOUT: ret ptr %call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 4 dereferenceable(4) ptr @_Z12ReturnIntRef10ForceThunk() #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local noundef nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRef10ForceThunk.carbon_thunk0() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: %call = call noundef nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRef10ForceThunk()
// CHECK:STDOUT: ret ptr %call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 4 dereferenceable(4) ptr @_Z13ReturnIntRRef10ForceThunk() #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define dso_local noundef nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRef10ForceThunk.carbon_thunk0() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %agg.tmp = alloca %class.ForceThunk, align 1
// CHECK:STDOUT: %call = call noundef nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRef10ForceThunk()
// CHECK:STDOUT: ret ptr %call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare noundef nonnull align 4 dereferenceable(4) ptr @_Z17ReturnConstIntRef10ForceThunk() #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CGetRefs.Main() #2 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %ReturnCRef__carbon_thunk.call = call ptr @_Z10ReturnCRef10ForceThunk.carbon_thunk0(), !dbg !15
// CHECK:STDOUT: %ReturnCRRef__carbon_thunk.call = call ptr @_Z11ReturnCRRef10ForceThunk.carbon_thunk0(), !dbg !16
// CHECK:STDOUT: %ReturnConstCRef__carbon_thunk.call = call ptr @_Z15ReturnConstCRef10ForceThunk.carbon_thunk0(), !dbg !17
// CHECK:STDOUT: %ReturnIntRef__carbon_thunk.call = call ptr @_Z12ReturnIntRef10ForceThunk.carbon_thunk0(), !dbg !18
// CHECK:STDOUT: %ReturnIntRRef__carbon_thunk.call = call ptr @_Z13ReturnIntRRef10ForceThunk.carbon_thunk0(), !dbg !19
// CHECK:STDOUT: %ReturnConstIntRef__carbon_thunk.call = call ptr @_Z17ReturnConstIntRef10ForceThunk.carbon_thunk0(), !dbg !20
// CHECK:STDOUT: ret void, !dbg !21
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { 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 #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: attributes #2 = { nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4, !5}
// CHECK:STDOUT: !llvm.dbg.cu = !{!6}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!8}
// 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 2}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !6 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !7, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !7 = !DIFile(filename: "return_references_via_thunk.carbon", directory: "")
// CHECK:STDOUT: !8 = !{!9, !9, i64 0}
// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "GetRefs", linkageName: "_CGetRefs.Main", scope: null, file: !7, line: 17, type: !13, spFlags: DISPFlagDefinition, unit: !6)
// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
// CHECK:STDOUT: !14 = !{null}
// CHECK:STDOUT: !15 = !DILocation(line: 18, column: 22, scope: !12)
// CHECK:STDOUT: !16 = !DILocation(line: 19, column: 22, scope: !12)
// CHECK:STDOUT: !17 = !DILocation(line: 20, column: 28, scope: !12)
// CHECK:STDOUT: !18 = !DILocation(line: 22, column: 20, scope: !12)
// CHECK:STDOUT: !19 = !DILocation(line: 23, column: 20, scope: !12)
// CHECK:STDOUT: !20 = !DILocation(line: 24, column: 26, scope: !12)
// CHECK:STDOUT: !21 = !DILocation(line: 17, column: 1, scope: !12)
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