mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Nicholas Bishop
0635f4628f
This works by generating two thunks, one in C++ and one in Carbon. For
example, given this input:
```c++
// Carbon:
fn Callme(f: f32) {}
// C++:
void F() {
// This will call `Callme__cpp_thunk`
Carbon::Callme(1.0);
}
```
These functions are generated:
```c++
// Carbon:
fn Callme__carbon_thunk(ref f: f32) {
// Call the target function.
Callme(f);
}
// C++:
// C++ declaration for the Carbon thunk.
void Callme__carbon_thunk(float& f);
void Callme__cpp_thunk(float f) {
// Call the Carbon thunk with args passed by reference.
Callme__carbon_thunk(f);
}
```
For now, all arguments are passed by reference, even if they are simple
types like pointers or i32.
Functions with non-void return types are not supported yet.
23 lines
804 B
C++
23 lines
804 B
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_CPP_EXPORT_H_
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#define CARBON_TOOLCHAIN_CHECK_CPP_EXPORT_H_
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#include "clang/AST/Decl.h"
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#include "toolchain/check/context.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::Check {
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// Get a `clang::FunctionDecl` that can be used to call a Carbon function.
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auto GetReverseInteropFunctionDecl(Context& context, SemIR::LocId loc_id,
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clang::DeclContext& decl_context,
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SemIR::FunctionId function_id)
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-> clang::FunctionDecl*;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_CPP_EXPORT_H_
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