1 //===- toyc.cpp - The Toy Compiler ----------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the entry point for the Toy compiler.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "toy/Parser.h"
14
15 #include "llvm/ADT/StringRef.h"
16 #include "llvm/Support/CommandLine.h"
17 #include "llvm/Support/ErrorOr.h"
18 #include "llvm/Support/MemoryBuffer.h"
19 #include "llvm/Support/raw_ostream.h"
20
21 using namespace toy;
22 namespace cl = llvm::cl;
23
24 static cl::opt<std::string> inputFilename(cl::Positional,
25 cl::desc("<input toy file>"),
26 cl::init("-"),
27 cl::value_desc("filename"));
28 namespace {
29 enum Action { None, DumpAST };
30 }
31
32 static cl::opt<enum Action>
33 emitAction("emit", cl::desc("Select the kind of output desired"),
34 cl::values(clEnumValN(DumpAST, "ast", "output the AST dump")));
35
36 /// Returns a Toy AST resulting from parsing the file or a nullptr on error.
parseInputFile(llvm::StringRef filename)37 std::unique_ptr<toy::ModuleAST> parseInputFile(llvm::StringRef filename) {
38 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> fileOrErr =
39 llvm::MemoryBuffer::getFileOrSTDIN(filename);
40 if (std::error_code ec = fileOrErr.getError()) {
41 llvm::errs() << "Could not open input file: " << ec.message() << "\n";
42 return nullptr;
43 }
44 auto buffer = fileOrErr.get()->getBuffer();
45 LexerBuffer lexer(buffer.begin(), buffer.end(), std::string(filename));
46 Parser parser(lexer);
47 return parser.parseModule();
48 }
49
main(int argc,char ** argv)50 int main(int argc, char **argv) {
51 cl::ParseCommandLineOptions(argc, argv, "toy compiler\n");
52
53 auto moduleAST = parseInputFile(inputFilename);
54 if (!moduleAST)
55 return 1;
56
57 switch (emitAction) {
58 case Action::DumpAST:
59 dump(*moduleAST);
60 return 0;
61 default:
62 llvm::errs() << "No action specified (parsing only?), use -emit=<action>\n";
63 }
64
65 return 0;
66 }
67