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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/sem_ir/function.cpp
+6
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@@ -64,6 +64,12 @@ auto GetCallee(const File& sem_ir, InstId callee_id,
"Invalid callee id in a specific context");
}
if (auto fn_ptr_type = sem_ir.types().TryGetAs<CppFunctionPointerType>(
sem_ir.insts().Get(callee_id).type_id())) {
return CalleeCppFunctionPointer{.function_type_id =
fn_ptr_type->clang_type_id};
}
auto val_id = sem_ir.constant_values().GetConstantInstId(callee_id);
if (!val_id.has_value()) {
return CalleeNonFunction();