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https://github.com/carbon-language/carbon-lang.git
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Lucile Rose Nihlen
bc1ae703c3
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.
67 lines
3.0 KiB
Plaintext
67 lines
3.0 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/int.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/cpp_run.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/cpp_run.carbon
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// --- carbon_run.carbon
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import Cpp inline '''
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namespace N {
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void Run() {}
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}
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''';
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fn Run() {
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Cpp.N.Run();
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}
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// CHECK:STDOUT: ; ModuleID = 'carbon_run.carbon'
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// CHECK:STDOUT: source_filename = "carbon_run.carbon"
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// 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"
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// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
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// CHECK:STDOUT: define dso_local void @_ZN1N3RunEv() #0 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret void
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define i32 @main() #1 !dbg !11 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: call void @_ZN1N3RunEv(), !dbg !15
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// CHECK:STDOUT: ret i32 0, !dbg !16
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: attributes #0 = { mustprogress nounwind 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" }
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// CHECK:STDOUT: attributes #1 = { nounwind }
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// CHECK:STDOUT:
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// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
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// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
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// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
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// CHECK:STDOUT:
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// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
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// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
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// CHECK:STDOUT: !2 = !{i32 8, !"PIC Level", i32 2}
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// CHECK:STDOUT: !3 = !{i32 7, !"PIE Level", i32 2}
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// CHECK:STDOUT: !4 = !{i32 7, !"uwtable", i32 2}
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// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !6 = !DIFile(filename: "carbon_run.carbon", directory: "")
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// CHECK:STDOUT: !7 = !{!8, !8, i64 0}
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// CHECK:STDOUT: !8 = !{!"int", !9, i64 0}
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// CHECK:STDOUT: !9 = !{!"omnipotent char", !10, i64 0}
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// CHECK:STDOUT: !10 = !{!"Simple C++ TBAA"}
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// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !6, line: 8, type: !12, spFlags: DISPFlagDefinition, unit: !5)
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// CHECK:STDOUT: !12 = !DISubroutineType(types: !13)
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// CHECK:STDOUT: !13 = !{!14}
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// CHECK:STDOUT: !14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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// CHECK:STDOUT: !15 = !DILocation(line: 9, column: 3, scope: !11)
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// CHECK:STDOUT: !16 = !DILocation(line: 8, column: 1, scope: !11)
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