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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/generate_ast.cpp
+1 -44
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@@ -165,9 +165,6 @@ class CarbonExternalASTSource : public SemIR::ReadOnlyASTSource {
auto MapInstIdToClangDeclOrType(LookupResult lookup)
-> std::variant<clang::NamedDecl*, clang::QualType>;
auto GetOrExportFunctionToCpp(SemIR::InstId target_inst_id,
SemIR::FunctionId function_id)
-> clang::NamedDecl*;
// Get a current best-effort location for the current position within C++
// processing.
auto GetCurrentCppLocId() -> SemIR::LocId {
@@ -233,7 +230,7 @@ auto CarbonExternalASTSource::MapInstIdToClangDeclOrType(LookupResult lookup)
context_->types().GetTypeInstId(target_inst.type_id());
auto callee = GetCallee(context_->sem_ir(), target_inst_id);
if (auto* callee_function = std::get_if<SemIR::CalleeFunction>(&callee)) {
return GetOrExportFunctionToCpp(target_inst_id,
return GetOrExportFunctionToCpp(*context_, SemIR::LocId(target_inst_id),
callee_function->function_id);
} else if (auto generic_class =
context_->insts().TryGetAs<SemIR::GenericClassType>(
@@ -255,46 +252,6 @@ auto CarbonExternalASTSource::MapInstIdToClangDeclOrType(LookupResult lookup)
}
}
auto CarbonExternalASTSource::GetOrExportFunctionToCpp(
SemIR::InstId target_inst_id, SemIR::FunctionId function_id)
-> clang::NamedDecl* {
SemIR::Function& function = context_->functions().Get(function_id);
if (const auto* clang_decl =
context_->clang_decls().Lookup(function.first_decl_id())) {
return cast<clang::NamedDecl>(clang_decl->decl());
}
auto* named_decl =
ExportFunctionToCpp(*context_, SemIR::LocId(target_inst_id), function_id);
if (!named_decl) {
return nullptr;
}
if (auto* function_template_decl =
llvm::dyn_cast<clang::FunctionTemplateDecl>(named_decl)) {
context_->clang_decls().Add(
{.key = SemIR::ClangDeclKey::ForNonFunctionDecl(function_template_decl),
.inst_id = function.first_decl_id()});
return function_template_decl;
}
auto* clang_function_decl = llvm::cast<clang::FunctionDecl>(named_decl);
SemIR::ClangDeclSignature thunk_signature;
thunk_signature.kind = SemIR::ClangDeclSignature::Normal;
thunk_signature.num_params =
static_cast<int32_t>(clang_function_decl->getNumParams());
thunk_signature.passing_modes.assign(
thunk_signature.num_params,
SemIR::ClangDeclSignature::PassingMode::ByValue);
context_->clang_decls().Add(
{.key = SemIR::ClangDeclKey::ForFunctionDecl(
clang_function_decl,
context_->clang_decl_signatures().Add(std::move(thunk_signature))),
.inst_id = function.first_decl_id()});
return clang_function_decl;
}
auto CarbonExternalASTSource::BuildCarbonNamespace() -> void {
static const llvm::StringLiteral carbon_namespace_name = "Carbon";
auto& ast_context = context_->ast_context();