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Initial support for C++ function pointers (#7788)

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This change introduces a new inst kind `CppFunctionPointerType`, which
represents an imported C++ function pointer that can be invoked from
Carbon (support for forming such a pointer from a Carbon function is in
a follow-up PR). This is implemented by treating the operation of
invoking a function pointer in C++ as if it were a call to an `__invoke`
method on the function pointer type, and extending the existing
function-import logic to support importing this fictitious method.

---------

Co-authored-by: Nicholas Bishop <nbishop@nbishop.net>
This commit is contained in:
Geoff Romer
2026-09-30 00:06:06 +00:00
committed by GitHub
co-authored by Nicholas Bishop
parent f65572a1e6
commit 12e1afeb15
41 changed files with 2030 additions and 200 deletions
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toolchain/check/cpp/constant.cpp
+7
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@@ -313,6 +313,13 @@ auto MaybeModifyCppThunkCallForConstEval(Context& context, SemIR::Call* call)
.GetAs<SemIR::FunctionDecl>(thunk_callee_inst_id)
.function_id);
const auto* clang_decl_info =
context.clang_decls().Lookup(thunk_callee_function.first_decl_id());
if (clang_decl_info == nullptr) {
// The `__invoke` thunk for a function pointer doesn't have a declared
// C++ callee.
return;
}
function_decl = cast<clang::FunctionDecl>(
context.clang_decls()
.Lookup(thunk_callee_function.first_decl_id())