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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-system.h"
#include "rust-diagnostics.h"
#include "rust-proc-macro.h"
#include "rust-session-manager.h"
#include "rust-lex.h"
#include "rust-token-converter.h"
#include "rust-attributes.h"
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <dlfcn.h>
#endif
namespace Rust {
BangProcMacro::BangProcMacro (ProcMacro::Bang macro)
: name (macro.name), node_id (Analysis::Mappings::get ().get_next_node_id ()),
macro (macro.macro)
{}
AttributeProcMacro::AttributeProcMacro (ProcMacro::Attribute macro)
: name (macro.name), node_id (Analysis::Mappings::get ().get_next_node_id ()),
macro (macro.macro)
{}
CustomDeriveProcMacro::CustomDeriveProcMacro (ProcMacro::CustomDerive macro)
: trait_name (macro.trait_name),
attributes (macro.attributes, macro.attributes + macro.attr_size),
node_id (Analysis::Mappings::get ().get_next_node_id ()),
macro (macro.macro)
{}
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, Session::get_instance ().linemap);
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 Handle, typename Symbol, typename Callback>
bool
register_callback (Handle handle, Symbol, std::string symbol_name,
Callback callback)
{
#ifdef _WIN32
FARPROC addr = GetProcAddress (handle, symbol_name.c_str ());
#else
void *addr = dlsym (handle, symbol_name.c_str ());
#endif
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)
{
#ifdef _WIN32
HMODULE handle = LoadLibraryA (path.c_str ());
// We're leaking the handle since we can't ever unload it
if (!handle)
{
char msg[300];
FormatMessageA (FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, GetLastError (), 0, msg, sizeof msg, nullptr);
rust_debug ("Error whilst opening procedural macro: %s", msg);
return nullptr;
}
#else
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;
}
#endif
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.
auto symbol_name = generate_proc_macro_decls_symbol (0 /* FIXME */);
return *reinterpret_cast<const ProcMacro::ProcmacroArray **> (
#ifdef _WIN32
GetProcAddress (handle, symbol_name.c_str ())
#else
dlsym (handle, symbol_name.c_str ())
#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", (unsigned long) array->length);
return std::vector<ProcMacro::Procmacro> (array->macros,
array->macros + array->length);
}
std::string
generate_proc_macro_decls_symbol (std::uint32_t stable_crate_id)
{
std::ostringstream stream;
stream << "__gccrs_proc_macro_decls_" << std::setfill ('0') << std::hex
<< std::setw (8) << stable_crate_id << "__";
return stream.str ();
}
} // namespace Rust
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