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// 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/>.
#include "rust-diagnostics.h"
#include "rust-proc-macro.h"
#include "rust-lex.h"
#include "rust-token-converter.h"
#ifndef _WIN32
#include <dlfcn.h>
#endif
namespace Rust {
const std::string PROC_MACRO_DECL_PREFIX = "__gccrs_proc_macro_decls_";
namespace {
ProcMacro::Literal
literal_from_string (const std::string &data, bool &error)
{
Lexer lex (data, nullptr);
const_TokenPtr output = lex.build_token ();
if (output == nullptr || !output->is_literal ())
{
error = true;
// We should probably rework this
return ProcMacro::Literal::make_usize (0);
}
error = false;
return convert_literal (output);
}
ProcMacro::TokenStream
tokenstream_from_string (std::string &data, bool &lex_error)
{
// FIXME: Insert location pointing to call site in tokens
Lexer lex (data, nullptr);
std::vector<const_TokenPtr> tokens;
TokenPtr ptr;
for (ptr = lex.build_token ();
ptr != nullptr && ptr->get_id () != END_OF_FILE;
ptr = lex.build_token ())
{
tokens.emplace_back (ptr);
}
if (ptr == nullptr)
{
lex_error = true;
return ProcMacro::TokenStream::make_tokenstream ();
}
lex_error = false;
return convert (tokens);
}
static_assert (
std::is_same<decltype (tokenstream_from_string) *,
ProcMacro::ts_from_str_fn_t>::value,
"Registration callback signature not synced, check proc macro internals.");
static_assert (
std::is_same<decltype (literal_from_string) *,
ProcMacro::lit_from_str_fn_t>::value,
"Registration callback signature not synced, check proc macro internals.");
} // namespace
template <typename Symbol, typename Callback>
bool
register_callback (void *handle, Symbol, std::string symbol_name,
Callback callback)
{
void *addr = dlsym (handle, symbol_name.c_str ());
if (addr == nullptr)
{
rust_error_at (UNDEF_LOCATION,
"Callback registration symbol (%s) missing from "
"proc macro, wrong version?",
symbol_name.c_str ());
return false;
}
auto storage = reinterpret_cast<Symbol *> (addr);
*storage = callback;
return true;
}
#define REGISTER_CALLBACK(HANDLE, SYMBOL, CALLBACK) \
register_callback (HANDLE, SYMBOL, #SYMBOL, CALLBACK)
const ProcMacro::ProcmacroArray *
load_macros_array (std::string path)
{
#ifndef _WIN32
void *handle = dlopen (path.c_str (), RTLD_LAZY | RTLD_LOCAL);
// We're leaking the handle since we can't ever unload it
if (!handle)
{
rust_debug ("Error whilst opening procedural macro: %s", dlerror ());
return nullptr;
}
if (!REGISTER_CALLBACK (handle, __gccrs_proc_macro_ts_from_str_,
tokenstream_from_string))
return nullptr;
if (!REGISTER_CALLBACK (handle, __gccrs_proc_macro_lit_from_str_,
literal_from_string))
return nullptr;
if (!REGISTER_CALLBACK (handle, __gccrs_proc_macro_is_available_,
ProcMacro::BridgeState::Available))
return nullptr;
// FIXME: Add CrateStableId handling, right now all versions may be loaded,
// even incompatible ones.
return *reinterpret_cast<const ProcMacro::ProcmacroArray **> (
dlsym (handle, PROC_MACRO_DECL_PREFIX.c_str ()));
#else
rust_sorry_at (UNDEF_LOCATION,
"Procedural macros are not yet supported on windows host");
rust_unreachable ();
#endif
}
#undef REGISTER_CALLBACK
const std::vector<ProcMacro::Procmacro>
load_macros (std::string path)
{
const ProcMacro::ProcmacroArray *array = load_macros_array (path);
// Did not load the proc macro
if (array == nullptr)
return {};
rust_debug ("Found %lu procedural macros", array->length);
return std::vector<ProcMacro::Procmacro> (array->macros,
array->macros + array->length);
}
} // namespace Rust
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