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bc1ae703c301527eea4d2cdf74e951fc3fb4a2f6
carbon-lang/toolchain/lower/testdata/class/basic.carbon
T
Lucile Rose Nihlen bc1ae703c3 return 0 from Run when it doesn't specify a return value (#7180) 
https://carbon.compiler-explorer.com/z/88K9Kh5Wo shows the program
exiting with a garbage value copied from uninitialized memory.

This PR modifies `lower` to detect if the function lowered is the
entry point and doesn't specify a return type. If so, it emits
different LLVM IR to return int32 0, and modifies the lowered
function signature to match the int32 return type.
2026-05-08 19:00:47 +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/class/basic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/class/basic.carbon
class C {
var a: i32;
var b: C*;
}
fn F(c: C) -> C;
fn Run() {
var c: C;
var _: C = F(c);
}
// CHECK:STDOUT: ; ModuleID = 'basic.carbon'
// CHECK:STDOUT: source_filename = "basic.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CF.Main(ptr sret({ i32, ptr }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @main() #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %c.var = alloca { i32, ptr }, align 8, !dbg !8
// CHECK:STDOUT: %_.var = alloca { i32, ptr }, align 8, !dbg !9
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !8
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !9
// CHECK:STDOUT: call void @_CF.Main(ptr %_.var, ptr %c.var), !dbg !10
// CHECK:STDOUT: call void @"_COp.71e25083d63c4d6c:core.Destroy.Core"(ptr %_.var), !dbg !9
// CHECK:STDOUT: call void @"_COp.71e25083d63c4d6c:core.Destroy.Core"(ptr %c.var), !dbg !8
// CHECK:STDOUT: ret i32 0, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.7e389eab4a7e5487:core.Destroy.Core"(ptr %self) #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !17
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.e7e7253cfbad8551:core.Destroy.Core"(ptr %self) #0 !dbg !18 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !24
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.71e25083d63c4d6c:core.Destroy.Core"(ptr %self) #0 !dbg !25 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !28
// 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: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_COp.71e25083d63c4d6c:core.Destroy.Core", { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "basic.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !3, line: 20, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{!7}
// CHECK:STDOUT: !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !8 = !DILocation(line: 21, column: 3, scope: !4)
// CHECK:STDOUT: !9 = !DILocation(line: 22, column: 3, scope: !4)
// CHECK:STDOUT: !10 = !DILocation(line: 22, column: 14, scope: !4)
// CHECK:STDOUT: !11 = !DILocation(line: 20, column: 1, scope: !4)
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Op", linkageName: "_COp.7e389eab4a7e5487:core.Destroy.Core", scope: null, file: !3, line: 22, type: !13, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !15)
// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
// CHECK:STDOUT: !14 = !{null, !7}
// CHECK:STDOUT: !15 = !{!16}
// CHECK:STDOUT: !16 = !DILocalVariable(arg: 1, scope: !12, type: !7)
// CHECK:STDOUT: !17 = !DILocation(line: 22, column: 3, scope: !12)
// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "Op", linkageName: "_COp.e7e7253cfbad8551:core.Destroy.Core", scope: null, file: !3, line: 22, type: !19, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !22)
// CHECK:STDOUT: !19 = !DISubroutineType(types: !20)
// CHECK:STDOUT: !20 = !{null, !21}
// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !22 = !{!23}
// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !18, type: !21)
// CHECK:STDOUT: !24 = !DILocation(line: 22, column: 3, scope: !18)
// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "Op", linkageName: "_COp.71e25083d63c4d6c:core.Destroy.Core", scope: null, file: !3, line: 22, type: !19, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !26)
// CHECK:STDOUT: !26 = !{!27}
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !25, type: !21)
// CHECK:STDOUT: !28 = !DILocation(line: 22, column: 3, scope: !25)
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