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Support for converting a function to a C++ function pointer (#7789)

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This commit is contained in:
Geoff Romer
2026-09-30 21:13:36 +00:00
committed by GitHub
parent cbdd6cee65
commit c0bd9606de
26 changed files with 1030 additions and 446 deletions
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toolchain/check/cpp/import.cpp
+6 -7
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@@ -1992,13 +1992,6 @@ static auto ImportFunction(Context& context, SemIR::LocId loc_id,
static auto DefineAsThunkCall(Context& context, SemIR::LocId loc_id,
const CalleeFunctionInfo& callee_info,
SemIR::Function& function) -> void {
Diagnostics::AnnotationScope annotate_diagnostics(
&context.emitter(), [&](auto& builder) {
CARBON_DIAGNOSTIC(InCppThunk, Note,
"in thunk for C++ function used here");
builder.Note(loc_id, InCppThunk);
});
clang::FunctionDecl* thunk_clang_decl = BuildCppThunk(context, callee_info);
if (thunk_clang_decl == nullptr) {
return;
@@ -2075,6 +2068,12 @@ static auto ImportFunctionDecl(Context& context, SemIR::LocId loc_id,
context.insts().GetAs<SemIR::FunctionDecl>(*function_decl_id).function_id;
SemIR::Function& imported_function = context.functions().Get(function_id);
if (IsCppThunkRequired(context, callee_info)) {
Diagnostics::AnnotationScope annotate_diagnostics(
&context.emitter(), [&](auto& builder) {
CARBON_DIAGNOSTIC(InCppThunk, Note,
"in thunk for C++ function used here");
builder.Note(loc_id, InCppThunk);
});
DefineAsThunkCall(context, loc_id, callee_info, imported_function);
} else {
// Inform Clang that the function has been referenced. This will trigger