forked from OSchip/llvm-project
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
//===- toyc.cpp - The Toy Compiler ----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the entry point for the Toy compiler.
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//
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//===----------------------------------------------------------------------===//
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#include "toy/Parser.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace toy;
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namespace cl = llvm::cl;
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static cl::opt<std::string> inputFilename(cl::Positional,
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cl::desc("<input toy file>"),
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cl::init("-"),
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cl::value_desc("filename"));
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namespace {
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enum Action { None, DumpAST };
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}
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static cl::opt<enum Action>
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emitAction("emit", cl::desc("Select the kind of output desired"),
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cl::values(clEnumValN(DumpAST, "ast", "output the AST dump")));
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/// Returns a Toy AST resulting from parsing the file or a nullptr on error.
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std::unique_ptr<toy::ModuleAST> parseInputFile(llvm::StringRef filename) {
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llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> fileOrErr =
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llvm::MemoryBuffer::getFileOrSTDIN(filename);
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if (std::error_code ec = fileOrErr.getError()) {
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llvm::errs() << "Could not open input file: " << ec.message() << "\n";
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return nullptr;
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}
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auto buffer = fileOrErr.get()->getBuffer();
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LexerBuffer lexer(buffer.begin(), buffer.end(), std::string(filename));
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Parser parser(lexer);
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return parser.parseModule();
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}
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, "toy compiler\n");
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auto moduleAST = parseInputFile(inputFilename);
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if (!moduleAST)
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return 1;
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switch (emitAction) {
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case Action::DumpAST:
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dump(*moduleAST);
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return 0;
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default:
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llvm::errs() << "No action specified (parsing only?), use -emit=<action>\n";
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}
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return 0;
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}
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