1 files changed, 137 insertions, 0 deletions
diff --git a/mlir/examples/toy/Ch2/toyc.cpp b/mlir/examples/toy/Ch2/toyc.cpp
new file mode 100644
index 00000000000..3e3db97b4ae
--- /dev/null
+++ b/mlir/examples/toy/Ch2/toyc.cpp
@@ -0,0 +1,137 @@
+//===- toyc.cpp - The Toy Compiler ----------------------------------------===//
+//
+// Part of the MLIR Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the entry point for the Toy compiler.
+//
+//===----------------------------------------------------------------------===//
+
+#include "toy/Dialect.h"
+#include "toy/MLIRGen.h"
+#include "toy/Parser.h"
+#include <memory>
+
+#include "mlir/Analysis/Verifier.h"
+#include "mlir/IR/MLIRContext.h"
+#include "mlir/IR/Module.h"
+#include "mlir/Parser.h"
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace toy;
+namespace cl = llvm::cl;
+
+static cl::opt<std::string> inputFilename(cl::Positional,
+                                          cl::desc("<input toy file>"),
+                                          cl::init("-"),
+                                          cl::value_desc("filename"));
+
+namespace {
+enum InputType { Toy, MLIR };
+}
+static cl::opt<enum InputType> inputType(
+    "x", cl::init(Toy), cl::desc("Decided the kind of output desired"),
+    cl::values(clEnumValN(Toy, "toy", "load the input file as a Toy source.")),
+    cl::values(clEnumValN(MLIR, "mlir",
+                          "load the input file as an MLIR file")));
+
+namespace {
+enum Action { None, DumpAST, DumpMLIR };
+}
+static cl::opt<enum Action> emitAction(
+    "emit", cl::desc("Select the kind of output desired"),
+    cl::values(clEnumValN(DumpAST, "ast", "output the AST dump")),
+    cl::values(clEnumValN(DumpMLIR, "mlir", "output the MLIR dump")));
+
+/// Returns a Toy AST resulting from parsing the file or a nullptr on error.
+std::unique_ptr<toy::ModuleAST> parseInputFile(llvm::StringRef filename) {
+  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> fileOrErr =
+      llvm::MemoryBuffer::getFileOrSTDIN(filename);
+  if (std::error_code ec = fileOrErr.getError()) {
+    llvm::errs() << "Could not open input file: " << ec.message() << "\n";
+    return nullptr;
+  }
+  auto buffer = fileOrErr.get()->getBuffer();
+  LexerBuffer lexer(buffer.begin(), buffer.end(), filename);
+  Parser parser(lexer);
+  return parser.parseModule();
+}
+
+int dumpMLIR() {
+  // Register our Dialect with MLIR.
+  mlir::registerDialect<mlir::toy::ToyDialect>();
+
+  mlir::MLIRContext context;
+
+  // Handle '.toy' input to the compiler.
+  if (inputType != InputType::MLIR &&
+      !llvm::StringRef(inputFilename).endswith(".mlir")) {
+    auto moduleAST = parseInputFile(inputFilename);
+    if (!moduleAST)
+      return 6;
+    mlir::OwningModuleRef module = mlirGen(context, *moduleAST);
+    if (!module)
+      return 1;
+
+    module->dump();
+    return 0;
+  }
+
+  // Otherwise, the input is '.mlir'.
+  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> fileOrErr =
+      llvm::MemoryBuffer::getFileOrSTDIN(inputFilename);
+  if (std::error_code EC = fileOrErr.getError()) {
+    llvm::errs() << "Could not open input file: " << EC.message() << "\n";
+    return -1;
+  }
+
+  // Parse the input mlir.
+  llvm::SourceMgr sourceMgr;
+  sourceMgr.AddNewSourceBuffer(std::move(*fileOrErr), llvm::SMLoc());
+  mlir::OwningModuleRef module = mlir::parseSourceFile(sourceMgr, &context);
+  if (!module) {
+    llvm::errs() << "Error can't load file " << inputFilename << "\n";
+    return 3;
+  }
+
+  module->dump();
+  return 0;
+}
+
+int dumpAST() {
+  if (inputType == InputType::MLIR) {
+    llvm::errs() << "Can't dump a Toy AST when the input is MLIR\n";
+    return 5;
+  }
+
+  auto moduleAST = parseInputFile(inputFilename);
+  if (!moduleAST)
+    return 1;
+
+  dump(*moduleAST);
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  cl::ParseCommandLineOptions(argc, argv, "toy compiler\n");
+
+  switch (emitAction) {
+  case Action::DumpAST:
+    return dumpAST();
+  case Action::DumpMLIR:
+    return dumpMLIR();
+  default:
+    llvm::errs() << "No action specified (parsing only?), use -emit=<action>\n";
+  }
+
+  return 0;
+}