184 lines
5.1 KiB
C++
184 lines
5.1 KiB
C++
/* -*- C++ -*-
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* Serene Programming Language
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*
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* Copyright (c) 2019-2022 Sameer Rahmani <lxsameer@gnu.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Commentary:
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* This is a `tablegen` backend to read from generate error definitions
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* from the given tablegen records defined in a `.td` file. It relies on
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* Two main classes to be available in the target source code. `SereneError`
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* and `ErrorVariant`. Checkout `libserene/include/serene/errors/base.h`.
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*/
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// The "serene/" part is due to a convention that we use in the project
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#include "serene/errors-backend.h"
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#include <llvm/Support/Casting.h>
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#include <llvm/Support/Format.h>
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#include <llvm/Support/LineIterator.h>
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#include <llvm/Support/MemoryBufferRef.h>
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#include <llvm/TableGen/Error.h>
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#include <llvm/TableGen/Record.h>
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#define DEBUG_TYPE "errors-backend"
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#define INSTANCE_SUFFIX "Instance"
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namespace serene {
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// Any helper data structures can be defined here. Some backends use
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// structs to collect information from the records.
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class ErrorsBackend {
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private:
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llvm::RecordKeeper &records;
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public:
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ErrorsBackend(llvm::RecordKeeper &rk) : records(rk) {}
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void createNSBody(llvm::raw_ostream &os);
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void createErrorClass(int id, llvm::Record &defRec, llvm::raw_ostream &os);
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void run(llvm::raw_ostream &os);
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}; // emitter class
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static void inNamespace(llvm::StringRef name, llvm::raw_ostream &os,
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std::function<void(llvm::raw_ostream &)> f) {
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os << "namespace " << name << " {\n\n";
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f(os);
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os << "}; // namespace " << name << "\n";
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};
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void ErrorsBackend::createErrorClass(const int id, llvm::Record &defRec,
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llvm::raw_ostream &os) {
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(void)records;
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(void)id;
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const auto recName = defRec.getName();
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os << " " << recName << ",\n";
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// os << "class " << recName << " : public llvm::ErrorInfo<" << recName << ",
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// "
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// << "SereneError> {\n"
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// << "public:\n"
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// << " using llvm::ErrorInfo<" << recName << ", "
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// << "SereneError>::ErrorInfo;\n"
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// << " constexpr static const int ID = " << id << ";\n};\n\n";
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};
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void ErrorsBackend::createNSBody(llvm::raw_ostream &os) {
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auto *index = records.getGlobal("errorsIndex");
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if (index == nullptr) {
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llvm::PrintError("'errorsIndex' var is missing!");
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return;
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}
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auto *indexList = llvm::dyn_cast<llvm::ListInit>(index);
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if (indexList == nullptr) {
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llvm::PrintError("'errorsIndex' has to be a list!");
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return;
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}
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os << "#ifdef GET_CLASS_DEFS\n";
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inNamespace("serene::errors", os, [&](llvm::raw_ostream &os) {
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os << "enum ErrorType {\n";
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for (size_t i = 0; i < indexList->size(); i++) {
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llvm::Record *defRec = indexList->getElementAsRecord(i);
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if (!defRec->isSubClassOf("Error")) {
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continue;
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}
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createErrorClass(i, *defRec, os);
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}
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os << "};\n\n";
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os << "#define NUMBER_OF_ERRORS " << indexList->size() << "\n";
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os << "static const ErrorVariant errorVariants[" << indexList->size()
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<< "] = {\n";
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for (size_t i = 0; i < indexList->size(); i++) {
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llvm::Record *defRec = indexList->getElementAsRecord(i);
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auto recName = defRec->getName();
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if (!defRec->isSubClassOf("Error")) {
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continue;
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}
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os << " ErrorVariant::make(" << i << ", \n";
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os << " \"" << recName << "\",\n";
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auto desc = defRec->getValueAsString("desc");
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if (desc.empty()) {
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llvm::PrintError("'desc' field is empty for " + recName);
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}
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os << " \"" << desc << "\",\n";
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auto help = defRec->getValueAsString("help");
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if (!help.empty()) {
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const llvm::MemoryBufferRef value(help, "help");
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llvm::line_iterator lines(value, false);
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while (!lines.is_at_end()) {
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if (lines.line_number() != 1) {
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os << '\t';
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}
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auto prevLine = *lines;
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lines++;
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os << '"' << prevLine << '"';
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if (lines.is_at_end()) {
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os << ";\n";
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} else {
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os << '\n';
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}
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}
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} else {
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os << " \"\"";
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}
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os << "),\n";
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}
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os << "};\n";
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});
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os << "#undef GET_CLASS_DEFS\n#endif\n\n";
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}
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void ErrorsBackend::run(llvm::raw_ostream &os) {
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(void)records;
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llvm::emitSourceFileHeader("Serene's Errors collection", os);
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// DO NOT GUARD THE HEADER WITH #ifndef ...
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os << "#include \"serene/errors/variant.h\"\n\n#include "
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"<llvm/Support/Error.h>\n\n";
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createNSBody(os);
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}
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void emitErrors(llvm::RecordKeeper &rk, llvm::raw_ostream &os) {
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ErrorsBackend(rk).run(os);
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}
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} // namespace serene
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