mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:10:12 +01:00
Boaz Brickner
d6fbe3c663
C++ Interop Demo:
```c++
// my_number.h
namespace MyNamespace {
class MyNumber {
public:
explicit MyNumber(int value) : value_(value) {}
auto value() const -> int { return value_; }
private:
int value_;
};
auto operator+(MyNumber lhs, MyNumber rhs) -> MyNumber;
} // namespace MyNamespace
```
```c++
// my_number.cpp
#include "my_number.h"
namespace MyNamespace {
auto operator+(MyNumber lhs, MyNumber rhs) -> MyNumber {
return MyNumber(lhs.value() + rhs.value());
}
} // namespace MyNamespace
```
```carbon
// main.carbon
library "Main";
import Core library "io";
import Cpp library "my_number.h";
fn Run() -> i32 {
let n1: Cpp.MyNamespace.MyNumber = Cpp.MyNamespace.MyNumber.MyNumber(5);
Core.Print(n1.value());
let n2: Cpp.MyNamespace.MyNumber = Cpp.MyNamespace.MyNumber.MyNumber(7);
Core.Print(n2.value());
let n3: Cpp.MyNamespace.MyNumber = n1 + n2;
Core.Print(n3.value());
return 0;
}
```
Before this change:
```
$ bazel-bin/toolchain/carbon compile main.carbon
main.carbon:13:38: error: cannot access member of interface `Core.AddWith(Cpp.MyNamespace.MyNumber)` in type `Cpp.MyNamespace.MyNumber` that does not implement that interface
let n3: Cpp.MyNamespace.MyNumber = n1 + n2;
^~~~~~~
```
With this change:
```shell
$ clang -c my_number.cpp
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link my_number.o main.o --output=demo
$ ./demo
5
7
12
```
Part of https://github.com/carbon-language/carbon-lang/issues/5995.
53 lines
2.4 KiB
C++
53 lines
2.4 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/ArrayRef.h"
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#include "llvm/ADT/IntrusiveRefCntPtr.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/VirtualFileSystem.h"
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#include "toolchain/check/context.h"
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#include "toolchain/check/diagnostic_helpers.h"
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#include "toolchain/check/operator.h"
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#include "toolchain/diagnostics/diagnostic_emitter.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,
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llvm::ArrayRef<Parse::Tree::PackagingNames> imports,
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llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
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std::shared_ptr<clang::CompilerInvocation> invocation)
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-> 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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// and returns a lookup result. If using the injected class name (`X.X()`),
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// imports the class constructor as a function named as the class.
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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::ScopeLookupResult;
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// Looks up the given operator in the Clang AST generated when importing C++
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// code and returns a lookup result.
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auto ImportOperatorFromCpp(Context& context, SemIR::LocId loc_id,
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SemIR::NameScopeId scope_id, Operator op)
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-> SemIR::ScopeLookupResult;
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// Given a Carbon class declaration that was imported from some kind of C++
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// declaration, such as a class or enum, attempt to import a corresponding class
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// definition. Returns true if nothing went wrong (whether or not a definition
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// could be imported), false if a diagnostic was produced.
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auto ImportClassDefinitionForClangDecl(Context& context, SemIR::LocId loc_id,
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SemIR::ClassId class_id,
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SemIR::ClangDeclId clang_decl_id)
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-> bool;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_IMPORT_CPP_H_
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