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https://github.com/carbon-language/carbon-lang.git
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Boaz Brickner
156ab889f8
Keep a pointer to the Clang declaration in Carbon's function declaration and use it in Carbon mangling by calling Clang mangling. Create Clang's `MangleContext` once on demand. Part of #4666. C++ Interop Demo: ```c++ // hello_world.h void hello_world(); ``` ```c++ // hello_world.cpp #include <cstdio> void hello_world() { printf("Hello World!\n"); } ``` ``` // main.carbon library "Main"; import Cpp library "hello_world.h"; fn Run() -> i32 { Cpp.hello_world(); return 0; } ``` ```shell $ clang -c hello_world.cpp $ bazel-bin/toolchain/carbon compile main.carbon $ bazel-bin/toolchain/carbon link hello_world.o main.o --output=demo $ ./demo Hello World! ```
48 lines
1.9 KiB
Plaintext
48 lines
1.9 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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// 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/function_decl.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/function_decl.carbon
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// --- function_decl.h
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void foo();
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// --- import_function_decl.carbon
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library "[[@TEST_NAME]]";
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import Cpp library "function_decl.h";
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fn MyF() {
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Cpp.foo();
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}
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// CHECK:STDOUT: ; ModuleID = 'import_function_decl.carbon'
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// CHECK:STDOUT: source_filename = "import_function_decl.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: define void @_CMyF.Main() !dbg !4 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: call void @_Z3foov(), !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: declare void @_Z3foov()
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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, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !3 = !DIFile(filename: "import_function_decl.carbon", directory: "")
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// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !3, line: 6, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
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// CHECK:STDOUT: !6 = !{}
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// CHECK:STDOUT: !7 = !DILocation(line: 7, column: 3, scope: !4)
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// CHECK:STDOUT: !8 = !DILocation(line: 6, column: 1, scope: !4)
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