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carbon-lang/toolchain/lower/testdata/interop/cpp/virtual_base.carbon
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Burak Emir 992d435023 Replace unused bindings with anonymous binding in lower/testdata. (#6479) 
This updates lower/testdata to use _ instead of proper names, in order
to avoid the "unused binding" warnings from #2022 which are being
implemented. These changes do not depend on the implementation which
should make everything easier to review.

See #6460 with part 1 of the implementation. It was split upon request
in order to make reviewing easier, the original state of the PR was
updating hundreds of test cases.
The PR has thus been split, part 2 including test cases changes can be
viewed at
https://github.com/burakemir/carbon-lang/tree/unused_pattern_bindings_p2022_impl_part2
... many tests need to be updated, so it seems best to get those tests
out of the way that are not interesting.

These are not all tests in lower/testdata - a few of them are
interesting in the sense that they cannot use '_' because it leads to
failed redeclaration check. This is exactly the scenario described in
#3763 which requires the 'unused' marker. Those are left untouched here
but are updated in
https://github.com/burakemir/carbon-lang/tree/unused_pattern_bindings_p2022_impl_part2
2025-12-17 15:43:04 +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/virtual_base.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/virtual_base.carbon
// --- diamond.h
struct A {
A();
int a;
};
struct B : virtual A {
B();
int b;
};
struct C : virtual A {
C();
int c;
};
struct D : B, C {
int d;
};
// Layout of D (x86_64):
//
// 0: B | 0: vptr
// 8: | 8: int B::b
// 12: (4 bytes padding)
// 16: C | 0: vptr
// 24: | 8: int C::c
// 28: int D::d
// 32: A | 0: int A::a
// 36: (4 bytes padding)
// 40: (end of D)
// --- use_diamond.carbon
library "[[@TEST_NAME]]";
import Cpp library "diamond.h";
fn Make() {
// This should construct a 40-byte object, using a construtor with a `...C1`
// mangled name for D (a complete object constructor), which should call
// constructors with `...C2` mangled names for A, B, and C (base subobject
// constructors).
var _: Cpp.D = Cpp.D.D();
}
fn AccessD(d: Cpp.D) -> i32 {
// This should read an i32 at offset 28.
return d.d;
}
// CHECK:STDOUT: ; ModuleID = 'use_diamond.carbon'
// CHECK:STDOUT: source_filename = "use_diamond.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: $_ZN1DC1Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTV1D = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTT1D = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTC1D0_1B = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTI1B = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTS1B = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTI1A = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTS1A = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTC1D16_1C = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTI1C = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTS1C = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTI1D = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTS1D = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: @_ZTV1D = linkonce_odr dso_local unnamed_addr constant { [3 x ptr], [3 x ptr] } { [3 x ptr] [ptr inttoptr (i64 32 to ptr), ptr null, ptr @_ZTI1D], [3 x ptr] [ptr inttoptr (i64 16 to ptr), ptr inttoptr (i64 -16 to ptr), ptr @_ZTI1D] }, comdat, align 8
// CHECK:STDOUT: @_ZTT1D = linkonce_odr dso_local unnamed_addr constant [4 x ptr] [ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 0, i32 3), ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr] }, ptr @_ZTC1D0_1B, i32 0, i32 0, i32 3), ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr] }, ptr @_ZTC1D16_1C, i32 0, i32 0, i32 3), ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 1, i32 3)], comdat, align 8
// CHECK:STDOUT: @_ZTC1D0_1B = linkonce_odr dso_local unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr inttoptr (i64 32 to ptr), ptr null, ptr @_ZTI1B] }, comdat, align 8
// CHECK:STDOUT: @_ZTI1B = linkonce_odr dso_local constant { ptr, ptr, i32, i32, ptr, i64 } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv121__vmi_class_type_infoE, i64 2), ptr @_ZTS1B, i32 0, i32 1, ptr @_ZTI1A, i64 -6141 }, comdat, align 8
// CHECK:STDOUT: @_ZTVN10__cxxabiv121__vmi_class_type_infoE = external global [0 x ptr]
// CHECK:STDOUT: @_ZTS1B = linkonce_odr dso_local constant [3 x i8] c"1B\00", comdat, align 1
// CHECK:STDOUT: @_ZTI1A = linkonce_odr dso_local constant { ptr, ptr } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv117__class_type_infoE, i64 2), ptr @_ZTS1A }, comdat, align 8
// CHECK:STDOUT: @_ZTVN10__cxxabiv117__class_type_infoE = external global [0 x ptr]
// CHECK:STDOUT: @_ZTS1A = linkonce_odr dso_local constant [3 x i8] c"1A\00", comdat, align 1
// CHECK:STDOUT: @_ZTC1D16_1C = linkonce_odr dso_local unnamed_addr constant { [3 x ptr] } { [3 x ptr] [ptr inttoptr (i64 16 to ptr), ptr null, ptr @_ZTI1C] }, comdat, align 8
// CHECK:STDOUT: @_ZTI1C = linkonce_odr dso_local constant { ptr, ptr, i32, i32, ptr, i64 } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv121__vmi_class_type_infoE, i64 2), ptr @_ZTS1C, i32 0, i32 1, ptr @_ZTI1A, i64 -6141 }, comdat, align 8
// CHECK:STDOUT: @_ZTS1C = linkonce_odr dso_local constant [3 x i8] c"1C\00", comdat, align 1
// CHECK:STDOUT: @_ZTI1D = linkonce_odr dso_local constant { ptr, ptr, i32, i32, ptr, i64, ptr, i64 } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv121__vmi_class_type_infoE, i64 2), ptr @_ZTS1D, i32 2, i32 2, ptr @_ZTI1B, i64 2, ptr @_ZTI1C, i64 4098 }, comdat, align 8
// CHECK:STDOUT: @_ZTS1D = linkonce_odr dso_local constant [3 x i8] c"1D\00", comdat, align 1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CMake.Main() #0 !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %_.var = alloca [40 x i8], align 1, !dbg !10
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !10
// CHECK:STDOUT: call void @_ZN1DC1Ev.carbon_thunk(ptr %_.var), !dbg !11
// CHECK:STDOUT: call void @_ZN1DD1Ev(ptr %_.var), !dbg !10
// CHECK:STDOUT: ret void, !dbg !12
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZN1DD1Ev(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CAccessD.Main(ptr %d) #0 !dbg !13 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc16_11.1.d = getelementptr inbounds nuw [40 x i8], ptr %d, i32 0, i32 28, !dbg !20
// CHECK:STDOUT: %.loc16_11.2 = load i32, ptr %.loc16_11.1.d, align 4, !dbg !20
// CHECK:STDOUT: ret i32 %.loc16_11.2, !dbg !21
// 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
// CHECK:STDOUT: define dso_local void @_ZN1DC1Ev.carbon_thunk(ptr %return) #2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8
// CHECK:STDOUT: %0 = load ptr, ptr %return.addr, align 8
// CHECK:STDOUT: call void @_ZN1DC1Ev(ptr nonnull align 8 dereferenceable(32) %0)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1DC1Ev(ptr nonnull align 8 dereferenceable(32) %this) unnamed_addr #3 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: %0 = getelementptr inbounds i8, ptr %this1, i64 32
// CHECK:STDOUT: call void @_ZN1AC2Ev(ptr nonnull align 4 dereferenceable(4) %0)
// CHECK:STDOUT: call void @_ZN1BC2Ev(ptr nonnull align 8 dereferenceable(12) %this1, ptr getelementptr inbounds ([4 x ptr], ptr @_ZTT1D, i64 0, i64 1))
// CHECK:STDOUT: %1 = getelementptr inbounds i8, ptr %this1, i64 16
// CHECK:STDOUT: call void @_ZN1CC2Ev(ptr nonnull align 8 dereferenceable(12) %1, ptr getelementptr inbounds ([4 x ptr], ptr @_ZTT1D, i64 0, i64 2))
// CHECK:STDOUT: store ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 0, i32 3), ptr %this1, align 8
// CHECK:STDOUT: %add.ptr = getelementptr inbounds i8, ptr %this1, i64 16
// CHECK:STDOUT: store ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 1, i32 3), ptr %add.ptr, align 8
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZN1AC2Ev(ptr nonnull align 4 dereferenceable(4)) unnamed_addr #4
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZN1BC2Ev(ptr nonnull align 8 dereferenceable(12), ptr) unnamed_addr #4
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZN1CC2Ev(ptr nonnull align 8 dereferenceable(12), ptr) unnamed_addr #4
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 0, i32 3), { 1, 0 }
// CHECK:STDOUT: uselistorder ptr getelementptr inbounds inrange(-24, 0) ({ [3 x ptr], [3 x ptr] }, ptr @_ZTV1D, i32 0, i32 1, i32 3), { 1, 0 }
// CHECK:STDOUT: uselistorder ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv121__vmi_class_type_infoE, i64 2), { 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_ZTI1B, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_ZTI1A, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_ZTI1C, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_ZTI1D, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { 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: attributes #3 = { 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 #4 = { "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_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "use_diamond.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "Make", linkageName: "_CMake.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{null}
// CHECK:STDOUT: !10 = !DILocation(line: 11, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 11, column: 18, scope: !7)
// CHECK:STDOUT: !12 = !DILocation(line: 6, column: 1, scope: !7)
// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "AccessD", linkageName: "_CAccessD.Main", scope: null, file: !6, line: 14, type: !14, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !18)
// CHECK:STDOUT: !14 = !DISubroutineType(types: !15)
// CHECK:STDOUT: !15 = !{!16, !17}
// CHECK:STDOUT: !16 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
// CHECK:STDOUT: !18 = !{!19}
// CHECK:STDOUT: !19 = !DILocalVariable(arg: 1, scope: !13, type: !17)
// CHECK:STDOUT: !20 = !DILocation(line: 16, column: 10, scope: !13)
// CHECK:STDOUT: !21 = !DILocation(line: 16, column: 3, scope: !13)
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