mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-04 22:02:52 +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.
30 lines
1.1 KiB
C++
30 lines
1.1 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_LOWER_LOWER_H_
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#define CARBON_TOOLCHAIN_LOWER_LOWER_H_
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "toolchain/parse/tree_and_subtrees.h"
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#include "toolchain/sem_ir/file.h"
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#include "toolchain/sem_ir/inst_namer.h"
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namespace Carbon::Lower {
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// Lowers SemIR to LLVM IR.
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auto LowerToLLVM(llvm::LLVMContext& llvm_context,
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llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
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std::optional<llvm::ArrayRef<Parse::GetTreeAndSubtreesFn>>
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tree_and_subtrees_getters_for_debug_info,
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llvm::StringRef module_name, const SemIR::File& sem_ir,
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clang::ASTUnit* cpp_ast, const SemIR::InstNamer* inst_namer,
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llvm::raw_ostream* vlog_stream)
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-> std::unique_ptr<llvm::Module>;
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} // namespace Carbon::Lower
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#endif // CARBON_TOOLCHAIN_LOWER_LOWER_H_
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