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832d46f01bca103733fe76943efe3b3021cdee92
carbon-lang/toolchain/lower/testdata/function/generic/call_recursive_impl.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/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/function/generic/call_recursive_impl.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_recursive_impl.carbon
import Core library "io";
interface I {
fn F();
}
class X {}
impl X as I {
fn F() { Core.Print(1); }
}
class Y {}
impl Y as I {
fn F() { Core.Print(2); }
}
// Builds on "call_different_impls.carbon", cannot lower a single G due to
// different calls to F. Additionally, add recursion so the function
// fingerprint is dependent on itself.
fn G(T:! I, count: i32) -> i32 {
T.F();
if (count > 0) {
return count;
}
return G(T, count + 1);
}
fn Run() {
G(X, 0);
G(Y, 0);
}
// CHECK:STDOUT: ; ModuleID = 'call_recursive_impl.carbon'
// CHECK:STDOUT: source_filename = "call_recursive_impl.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @printf.int.format = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CF.X.Main:I.Main"() #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Print.call = call i32 (ptr, ...) @printf(ptr @printf.int.format, i32 1), !dbg !7
// CHECK:STDOUT: ret void, !dbg !8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CF.Y.Main:I.Main"() #0 !dbg !9 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Print.call = call i32 (ptr, ...) @printf(ptr @printf.int.format, i32 2), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @main() #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %G.call.loc40 = call i32 @_CG.Main.e55c78367db83a6b(i32 0), !dbg !16
// CHECK:STDOUT: %G.call.loc41 = call i32 @_CG.Main.95a632fb0c368a62(i32 0), !dbg !17
// CHECK:STDOUT: ret i32 0, !dbg !18
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare i32 @printf(ptr, ...)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CG.Main.e55c78367db83a6b(i32 %count) #0 !dbg !19 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_CF.X.Main:I.Main"(), !dbg !24
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !25
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !26
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret i32 %count, !dbg !27
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !28
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.e55c78367db83a6b(i32 %Int.as.AddWith.impl.Op.call), !dbg !29
// CHECK:STDOUT: ret i32 %G.call, !dbg !30
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr i32 @_CG.Main.95a632fb0c368a62(i32 %count) #0 !dbg !31 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_CF.Y.Main:I.Main"(), !dbg !34
// CHECK:STDOUT: %Int.as.OrderedWith.impl.Greater.call = icmp sgt i32 %count, 0, !dbg !35
// CHECK:STDOUT: br i1 %Int.as.OrderedWith.impl.Greater.call, label %if.then, label %if.else, !dbg !36
// CHECK:STDOUT:
// CHECK:STDOUT: if.then: ; preds = %entry
// CHECK:STDOUT: ret i32 %count, !dbg !37
// CHECK:STDOUT:
// CHECK:STDOUT: if.else: ; preds = %entry
// CHECK:STDOUT: %Int.as.AddWith.impl.Op.call = add i32 %count, 1, !dbg !38
// CHECK:STDOUT: %G.call = call i32 @_CG.Main.95a632fb0c368a62(i32 %Int.as.AddWith.impl.Op.call), !dbg !39
// CHECK:STDOUT: ret i32 %G.call, !dbg !40
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @printf, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// 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: "call_recursive_impl.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "F", linkageName: "_CF.X.Main:I.Main", scope: null, file: !3, line: 20, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{null}
// CHECK:STDOUT: !7 = !DILocation(line: 20, column: 12, scope: !4)
// CHECK:STDOUT: !8 = !DILocation(line: 20, column: 3, scope: !4)
// CHECK:STDOUT: !9 = distinct !DISubprogram(name: "F", linkageName: "_CF.Y.Main:I.Main", scope: null, file: !3, line: 24, type: !5, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !10 = !DILocation(line: 24, column: 12, scope: !9)
// CHECK:STDOUT: !11 = !DILocation(line: 24, column: 3, scope: !9)
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !3, line: 39, type: !13, spFlags: DISPFlagDefinition, unit: !2)
// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
// CHECK:STDOUT: !14 = !{!15}
// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !16 = !DILocation(line: 40, column: 3, scope: !12)
// CHECK:STDOUT: !17 = !DILocation(line: 41, column: 3, scope: !12)
// CHECK:STDOUT: !18 = !DILocation(line: 39, column: 1, scope: !12)
// CHECK:STDOUT: !19 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.e55c78367db83a6b", scope: null, file: !3, line: 30, type: !20, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !22)
// CHECK:STDOUT: !20 = !DISubroutineType(types: !21)
// CHECK:STDOUT: !21 = !{!15, !15}
// CHECK:STDOUT: !22 = !{!23}
// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !19, type: !15)
// CHECK:STDOUT: !24 = !DILocation(line: 31, column: 3, scope: !19)
// CHECK:STDOUT: !25 = !DILocation(line: 33, column: 7, scope: !19)
// CHECK:STDOUT: !26 = !DILocation(line: 33, column: 6, scope: !19)
// CHECK:STDOUT: !27 = !DILocation(line: 34, column: 5, scope: !19)
// CHECK:STDOUT: !28 = !DILocation(line: 36, column: 15, scope: !19)
// CHECK:STDOUT: !29 = !DILocation(line: 36, column: 10, scope: !19)
// CHECK:STDOUT: !30 = !DILocation(line: 36, column: 3, scope: !19)
// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.95a632fb0c368a62", scope: null, file: !3, line: 30, type: !20, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !32)
// CHECK:STDOUT: !32 = !{!33}
// CHECK:STDOUT: !33 = !DILocalVariable(arg: 1, scope: !31, type: !15)
// CHECK:STDOUT: !34 = !DILocation(line: 31, column: 3, scope: !31)
// CHECK:STDOUT: !35 = !DILocation(line: 33, column: 7, scope: !31)
// CHECK:STDOUT: !36 = !DILocation(line: 33, column: 6, scope: !31)
// CHECK:STDOUT: !37 = !DILocation(line: 34, column: 5, scope: !31)
// CHECK:STDOUT: !38 = !DILocation(line: 36, column: 15, scope: !31)
// CHECK:STDOUT: !39 = !DILocation(line: 36, column: 10, scope: !31)
// CHECK:STDOUT: !40 = !DILocation(line: 36, column: 3, scope: !31)
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