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// Copyright (C) 2020-2024 Free Software Foundation, Inc.
// This file is part of GCC.
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#ifndef RUST_COMPILE_EXTERN_ITEM
#define RUST_COMPILE_EXTERN_ITEM
#include "rust-compile-base.h"
#include "rust-compile-intrinsic.h"
#include "rust-compile-type.h"
#include "rust-diagnostics.h"
#include "rust-hir-full-decls.h"
namespace Rust {
namespace Compile {
class CompileExternItem : public HIRCompileBase,
public HIR::HIRExternalItemVisitor
{
public:
static tree compile (HIR::ExternalItem *item, Context *ctx,
TyTy::BaseType *concrete = nullptr,
bool is_query_mode = false,
location_t ref_locus = UNDEF_LOCATION)
{
CompileExternItem compiler (ctx, concrete, ref_locus);
item->accept_vis (compiler);
if (is_query_mode && compiler.reference == error_mark_node)
rust_internal_error_at (ref_locus, "failed to compile extern item: %s",
item->as_string ().c_str ());
return compiler.reference;
}
void visit (HIR::ExternalStaticItem &item) override
{
// check if its already been compiled
Bvariable *lookup = Bvariable::error_variable ();
if (ctx->lookup_var_decl (item.get_mappings ().get_hirid (), &lookup))
{
reference = Backend::var_expression (lookup, ref_locus);
return;
}
TyTy::BaseType *resolved_type = nullptr;
bool ok = ctx->get_tyctx ()->lookup_type (item.get_mappings ().get_hirid (),
&resolved_type);
rust_assert (ok);
std::string name = item.get_item_name ().as_string ();
// FIXME this is assuming C ABI
std::string asm_name = name;
tree type = TyTyResolveCompile::compile (ctx, resolved_type);
bool is_external = true;
bool is_hidden = false;
bool in_unique_section = false;
Bvariable *static_global
= Backend::global_variable (name, asm_name, type, is_external, is_hidden,
in_unique_section, item.get_locus ());
ctx->insert_var_decl (item.get_mappings ().get_hirid (), static_global);
ctx->push_var (static_global);
reference = Backend::var_expression (static_global, ref_locus);
}
void visit (HIR::ExternalFunctionItem &function) override
{
TyTy::BaseType *fntype_tyty;
if (!ctx->get_tyctx ()->lookup_type (function.get_mappings ().get_hirid (),
&fntype_tyty))
{
rust_fatal_error (function.get_locus (),
"failed to lookup function type");
return;
}
rust_assert (fntype_tyty->get_kind () == TyTy::TypeKind::FNDEF);
TyTy::FnType *fntype = static_cast<TyTy::FnType *> (fntype_tyty);
if (fntype->has_substitutions_defined ())
{
// we cant do anything for this only when it is used and a concrete type
// is given
if (concrete == nullptr)
return;
else
{
rust_assert (concrete->get_kind () == TyTy::TypeKind::FNDEF);
fntype = static_cast<TyTy::FnType *> (concrete);
}
}
// items can be forward compiled which means we may not need to invoke this
// code. We might also have already compiled this generic function as well.
tree lookup = NULL_TREE;
if (ctx->lookup_function_decl (fntype->get_ty_ref (), &lookup,
fntype->get_id (), fntype))
{
reference = address_expression (lookup, ref_locus);
return;
}
if (fntype->has_substitutions_defined ())
// override the HIR lookups for the substitutions in this context
fntype->override_context ();
if (fntype->get_abi () == ABI::INTRINSIC)
{
Intrinsics compile (ctx);
tree fndecl = compile.compile (fntype);
ctx->insert_function_decl (fntype, fndecl);
return;
}
tree compiled_fn_type = TyTyResolveCompile::compile (ctx, fntype);
std::string ir_symbol_name = function.get_item_name ().as_string ();
std::string asm_name = function.get_item_name ().as_string ();
if (fntype->get_abi () == ABI::RUST)
{
// then we need to get the canonical path of it and mangle it
const Resolver::CanonicalPath *canonical_path = nullptr;
bool ok = ctx->get_mappings ()->lookup_canonical_path (
function.get_mappings ().get_nodeid (), &canonical_path);
rust_assert (ok);
ir_symbol_name = canonical_path->get () + fntype->subst_as_string ();
asm_name = ctx->mangle_item (fntype, *canonical_path);
}
const unsigned int flags = Backend::function_is_declaration;
tree fndecl = Backend::function (compiled_fn_type, ir_symbol_name, asm_name,
flags, function.get_locus ());
TREE_PUBLIC (fndecl) = 1;
setup_abi_options (fndecl, fntype->get_abi ());
ctx->insert_function_decl (fntype, fndecl);
reference = address_expression (fndecl, ref_locus);
}
void visit (HIR::ExternalTypeItem &type) override
{
rust_sorry_at (type.get_locus (), "extern types are not supported yet");
}
private:
CompileExternItem (Context *ctx, TyTy::BaseType *concrete,
location_t ref_locus)
: HIRCompileBase (ctx), concrete (concrete), reference (error_mark_node),
ref_locus (ref_locus)
{}
TyTy::BaseType *concrete;
tree reference;
location_t ref_locus;
};
} // namespace Compile
} // namespace Rust
#endif // RUST_COMPILE_EXTERN_ITEM
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