carbon-language/carbon-lang
1
0
Fork 0
mirror of https://github.com/carbon-language/carbon-lang.git synced 2026-10-04 22:02:52 +01:00
Code Issues Packages Projects Releases 10 Wiki Activity
4,893 Commits 3 Branches 813 Tags
c7a7688d21baa2bbceed4e5751302b92a9c17f93
Commit Graph
6 Commits
Author SHA1 Message Date
Richard Smith ead7803d60 Simplify importing of C++ global variables. (#6565) 
Remove the unnecessary two-phase creation of variables in C++ import. We
don't need to create a placeholder and overwrite it here, so stop doing
so.

Also, add the patterns to the imports table and don't create a
NameBindingDecl. The NameBindingDecl would never be used for anything.
This matches what we do when importing a Carbon variable, and improves
the formatted SemIR output.
 2026-01-09 00:16:27 +00:00
Geoff Romer 0811d996e1 Finish renaming BindName and related insts. (#6281) 
Resolves the TODO from #6235
 2025-10-28 17:17:38 +00:00
Richard Smith 6011040481 Rework handling of C++ references. (#6268) 
For now, map C++ reference types to const-qualified Carbon pointer types
rather than picking between a (non-const) pointer or a value type. This
fixes misbehavior in lowering for reference members in classes and
reference return types.

Update the special-case handling for references as function parameters
so that it continues to map const reference parameters to Carbon
pass-by-value, and unify the code paths for `self` parameters and other
parameters, which were mostly doing the same thing but had some subtle
differences.

Add references to the list of types that we can pass to and from C++
directly, without needing an additional layer of thunks.
 2025-10-28 00:33:26 +00:00
Geoff Romer 09710d102f Separate binding insts for refs and values (#6235) 
This resolves a TODO in `expr_info.cpp` by using the inst kind rather
than the bound value to track the binding's category.

Since we're churning all the `bind_name` insts in testdata anyway, I'm
also taking this opportunity to align the inst naming with the design's
terminology, by calling these insts "bindings" (this aspect of the PR is
dependent on #6231 resolving an ambiguity in that terminology). For
consistency we'll need to rename several other insts as well (see the
TODO on `RefBinding`); I'm deferring that to a separate PR to minimize
the review load, but I think those name changes are in-scope for this
review.
 2025-10-23 01:46:24 +00:00
Boaz Brickner 1ac1d11063 C++ Interop: Support reference types in fields and globals (#6187) 
Implemented by generalizing the reference type support for parameters
and return values to other use cases.
The changes to the `method.carbon` test are due to to supporting the
reference types but not supporting the necessary conversions.

C++ Interop Demo:

```c++
// global.h

struct C {
  int member = 0;
  int& member_ref = member;
};

extern C& global;
```

```c++
// global.cpp

#include "global.h"

static C static_c;

C& global= static_c;
```

```carbon
// main.carbon

library "Main";

import Core library "io";

import Cpp library "global.h";

fn Run() -> i32 {
  Core.Print(Cpp.global->member);
  ++(*Cpp.global->member_ref);
  Core.Print(Cpp.global->member);
  ++(*Cpp.global->member_ref);
  Core.Print(Cpp.global->member);
  return 0;
}
```

```shell
$ clang++ -stdlib=libc++ -c global.cpp
$ bazel build toolchain:carbon && bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link global.o main.o --output=demo
$ ./demo
0
1
2
```

**Without this change**:
```shell
main.carbon:10:14: error: semantics TODO: `Unsupported: var type: C &`
  Core.Print(Cpp.global->member);
             ^~~~~~~~~~
main.carbon:10:14: note: in `Cpp` name lookup for `global`
  Core.Print(Cpp.global->member);
             ^~~~~~~~~~
```

Part of #6006 and #6186.
 2025-10-10 23:15:31 +00:00
Boaz Brickner b88b53e7e3 C++ interop: Add support for importing globals (#6005) 
This supports importing globals in the global scope and within
namespaces, and support for class static data members.

C++ Interop Demo:

```c++
// my_global.h

extern int my_global;
void inc_my_global();
```

```c++
// my_global.cpp

#include "my_global.h"

int my_global = 5;

void inc_my_global() {
  ++my_global;
}
```

```carbon
// main.carbon

library "Main";

import Core library "io";
import Cpp library "my_global.h";

fn Run() -> i32 {
  Core.Print(Cpp.my_global);
  Cpp.inc_my_global();
  Core.Print(Cpp.my_global);
  return 0;
}
```

```shell
$ clang -c my_global.cpp
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link my_global.o main.o --output=demo
$ ./demo
5
6
```

Part of #6006.
 2025-09-08 08:34:55 +00:00