mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-02 22:02:51 +01:00
Boaz Brickner
852d0191a9
This requires:
* Making `FunctionDecl` mutable since generating code
(`HandleTopLevelDecl()`) requires a mutable declaration and since we
manually add `used` attribute to force code generation.
* Passing the file system to `Lower` since it's needed by Clang code
generation.
* Creating an internal Clang LLVM module and link it against the Carbon
LLVM module.
Demo:
```c++
// hello_world.h
extern int puts;
inline void hello_world() {
((int (*)(const char*))&puts)("hello world");
}
```
```carbon
// main.carbon
library "Main";
import Cpp library "hello_world.h";
fn Run() -> i32 {
Cpp.hello_world();
return 0;
}
```
```shell
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link main.o --output=demo
$ ./demo
hello world
```
Based on https://github.com/carbon-language/carbon-lang/pull/5406.
Part of #5405.
31 lines
1.3 KiB
C++
31 lines
1.3 KiB
C++
// 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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#ifndef CARBON_TOOLCHAIN_CHECK_IMPORT_CPP_H_
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#define CARBON_TOOLCHAIN_CHECK_IMPORT_CPP_H_
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#include "llvm/ADT/StringRef.h"
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#include "toolchain/check/context.h"
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#include "toolchain/check/diagnostic_helpers.h"
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namespace Carbon::Check {
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// Generates a C++ header that includes the imported cpp files, parses it,
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// generates the AST from it and links `SemIR::File` to it. Report C++ errors
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// and warnings. If successful, adds a `Cpp` namespace and returns the AST.
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auto ImportCppFiles(Context& context, llvm::StringRef importing_file_path,
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llvm::ArrayRef<Parse::Tree::PackagingNames> imports,
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llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
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llvm::StringRef target) -> std::unique_ptr<clang::ASTUnit>;
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// Looks up the given name in the Clang AST generated when importing C++ code.
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// If successful, generates the instruction and returns the new `InstId`.
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auto ImportNameFromCpp(Context& context, SemIR::LocId loc_id,
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SemIR::NameScopeId scope_id, SemIR::NameId name_id)
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-> SemIR::InstId;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_IMPORT_CPP_H_
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