mirror of
https://github.com/carbon-language/carbon-lang.git
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Richard Smith
19f1bf94db
We can lower the same variable from multiple `SemIR::File`s if we reach it through a specific for a generic in a different file. When this happens, reuse the same global variable in lowering. This matches how we handle the same problem for functions. Assisted-by: Claude via Antigravity
110 lines
5.1 KiB
Plaintext
110 lines
5.1 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/var/import_from_generic.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/var/import_from_generic.carbon
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// --- lib.carbon
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library "[[@TEST_NAME]]";
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var g: i32 = 1;
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fn Get[T: type](_: T) -> i32 { return g; }
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// --- use.carbon
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library "[[@TEST_NAME]]";
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import library "lib";
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// The direct reference to `g` and the reference from the specific `Get(())`
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// should both refer to the same global.
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fn F() -> i32 { return g; }
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fn G() -> i32 { return Get(()); }
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// CHECK:STDOUT: ; ---
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// CHECK:STDOUT: ; ModuleID = 'lib.carbon'
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// CHECK:STDOUT: source_filename = "lib.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: @_Cg.Main = global i32 0
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// CHECK:STDOUT: @llvm.global_ctors = appending global [1 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 0, ptr @_C__global_init.Main, ptr null }]
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define internal void @_C__global_init.Main() #0 !dbg !23 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: store i32 1, ptr @_Cg.Main, align 4, !dbg !24
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// CHECK:STDOUT: ret void, !dbg !25
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// CHECK:STDOUT: }
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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.dbg.cu = !{!19}
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// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
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// CHECK:STDOUT:
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// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
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// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
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// CHECK:STDOUT: !18 = !DIFile(filename: "lib.carbon", directory: "")
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// CHECK:STDOUT: !19 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !18, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !21 = !{null}
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// CHECK:STDOUT: !22 = !DISubroutineType(types: !21)
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// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "__global_init", linkageName: "_C__global_init.Main", scope: null, file: !18, type: !22, spFlags: DISPFlagDefinition, unit: !19)
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// CHECK:STDOUT: !24 = !DILocation(line: 4, column: 1, scope: !23)
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// CHECK:STDOUT: !25 = !DILocation(line: 0, scope: !23)
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; ---
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// CHECK:STDOUT: ; ModuleID = 'use.carbon'
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// CHECK:STDOUT: source_filename = "use.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: @_Cg.Main = external global i32
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define i32 @_CF.Main() #0 !dbg !30 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %.loc8_24 = load i32, ptr @_Cg.Main, align 4, !dbg !33
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// CHECK:STDOUT: ret i32 %.loc8_24, !dbg !34
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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 @_CG.Main() #0 !dbg !35 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %Get.call = call i32 @_CGet.Main.e43630e9a6c38c3f(), !dbg !38
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// CHECK:STDOUT: ret i32 %Get.call, !dbg !39
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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 i32 @_CGet.Main.e43630e9a6c38c3f() #0 !dbg !40 {
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// CHECK:STDOUT: %1 = load i32, ptr @_Cg.Main, align 4, !dbg !44
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// CHECK:STDOUT: ret i32 %1, !dbg !45
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// CHECK:STDOUT: }
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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.dbg.cu = !{!27}
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// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
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// CHECK:STDOUT:
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// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
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// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
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// CHECK:STDOUT: !18 = !DIFile(filename: "lib.carbon", directory: "")
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// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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// CHECK:STDOUT: !26 = !DIFile(filename: "use.carbon", directory: "")
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// CHECK:STDOUT: !27 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !26, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !28 = !{!20}
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// CHECK:STDOUT: !29 = !DISubroutineType(types: !28)
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// CHECK:STDOUT: !30 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !26, line: 8, type: !29, spFlags: DISPFlagDefinition, unit: !27)
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// CHECK:STDOUT: !33 = !DILocation(line: 8, column: 24, scope: !30)
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// CHECK:STDOUT: !34 = !DILocation(line: 8, column: 17, scope: !30)
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// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main", scope: null, file: !26, line: 9, type: !29, spFlags: DISPFlagDefinition, unit: !27)
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// CHECK:STDOUT: !38 = !DILocation(line: 9, column: 24, scope: !35)
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// CHECK:STDOUT: !39 = !DILocation(line: 9, column: 17, scope: !35)
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// CHECK:STDOUT: !40 = distinct !DISubprogram(name: "Get", linkageName: "_CGet.Main.e43630e9a6c38c3f", scope: null, file: !18, line: 6, type: !29, spFlags: DISPFlagDefinition, unit: !27)
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// CHECK:STDOUT: !44 = !DILocation(line: 6, column: 39, scope: !40)
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// CHECK:STDOUT: !45 = !DILocation(line: 6, column: 32, scope: !40)
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// CHECK:STDOUT:
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