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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.
112 lines
5.3 KiB
Plaintext
112 lines
5.3 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/full.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/function/generic/call_different_impls.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/function/generic/call_different_impls.carbon
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import Core library "io";
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interface I {
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fn F();
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}
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class X {}
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impl X as I {
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fn F() { Core.Print(1); }
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}
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class Y {}
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impl Y as I {
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fn F() { Core.Print(2); }
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}
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// Cannot coalesce the lowering for G specifics, as they call different functions.
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// Check different functions are still emitted when trying to deduplicate emitted definitons.
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fn G(T:! I) { T.F(); }
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fn Run() {
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G(X);
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G(Y);
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}
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// CHECK:STDOUT: ; ModuleID = 'call_different_impls.carbon'
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// CHECK:STDOUT: source_filename = "call_different_impls.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: @printf.int.format = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define void @"_CF.X.Main:I.Main"() #0 !dbg !4 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %Print.call = call i32 (ptr, ...) @printf(ptr @printf.int.format, i32 1), !dbg !7
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// CHECK:STDOUT: ret void, !dbg !8
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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 void @"_CF.Y.Main:I.Main"() #0 !dbg !9 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %Print.call = call i32 (ptr, ...) @printf(ptr @printf.int.format, i32 2), !dbg !10
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// CHECK:STDOUT: ret void, !dbg !11
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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() #0 !dbg !12 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: call void @_CG.Main.e55c78367db83a6b(), !dbg !16
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// CHECK:STDOUT: call void @_CG.Main.95a632fb0c368a62(), !dbg !17
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// CHECK:STDOUT: ret i32 0, !dbg !18
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: declare i32 @printf(ptr, ...)
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CG.Main.e55c78367db83a6b() #0 !dbg !19 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: call void @"_CF.X.Main:I.Main"(), !dbg !20
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// CHECK:STDOUT: ret void, !dbg !21
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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 linkonce_odr void @_CG.Main.95a632fb0c368a62() #0 !dbg !22 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: call void @"_CF.Y.Main:I.Main"(), !dbg !23
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// CHECK:STDOUT: ret void, !dbg !24
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; uselistorder directives
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// CHECK:STDOUT: uselistorder ptr @printf, { 1, 0 }
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// CHECK:STDOUT:
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// CHECK:STDOUT: attributes #0 = { nounwind }
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// CHECK:STDOUT:
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// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
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// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
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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 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !3 = !DIFile(filename: "call_different_impls.carbon", directory: "")
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// 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)
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// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
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// CHECK:STDOUT: !6 = !{null}
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// CHECK:STDOUT: !7 = !DILocation(line: 20, column: 12, scope: !4)
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// CHECK:STDOUT: !8 = !DILocation(line: 20, column: 3, scope: !4)
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// 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)
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// CHECK:STDOUT: !10 = !DILocation(line: 24, column: 12, scope: !9)
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// CHECK:STDOUT: !11 = !DILocation(line: 24, column: 3, scope: !9)
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// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !3, line: 31, type: !13, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
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// CHECK:STDOUT: !14 = !{!15}
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// CHECK:STDOUT: !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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// CHECK:STDOUT: !16 = !DILocation(line: 32, column: 3, scope: !12)
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// CHECK:STDOUT: !17 = !DILocation(line: 33, column: 3, scope: !12)
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// CHECK:STDOUT: !18 = !DILocation(line: 31, column: 1, scope: !12)
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// CHECK:STDOUT: !19 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.e55c78367db83a6b", scope: null, file: !3, line: 29, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !20 = !DILocation(line: 29, column: 15, scope: !19)
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// CHECK:STDOUT: !21 = !DILocation(line: 29, column: 1, scope: !19)
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// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.95a632fb0c368a62", scope: null, file: !3, line: 29, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !23 = !DILocation(line: 29, column: 15, scope: !22)
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// CHECK:STDOUT: !24 = !DILocation(line: 29, column: 1, scope: !22)
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