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 "mlir/IR/Diagnostics.h"
14#include "toy/AST.h"
15#include "toy/Dialect.h"
16#include "toy/Lexer.h"
17#include "toy/MLIRGen.h"
18#include "toy/Parser.h"
19
20#include "mlir/IR/AsmState.h"
21#include "mlir/IR/BuiltinOps.h"
22#include "mlir/IR/MLIRContext.h"
23#include "mlir/IR/Verifier.h"
24#include "mlir/Parser/Parser.h"
25#include "mlir/Pass/PassManager.h"
26#include "mlir/Transforms/Passes.h"
27
28#include "llvm/ADT/StringRef.h"
29#include "llvm/Support/CommandLine.h"
30#include "llvm/Support/ErrorOr.h"
31#include "llvm/Support/MemoryBuffer.h"
32#include "llvm/Support/SourceMgr.h"
33#include "llvm/Support/raw_ostream.h"
34#include <memory>
35#include <string>
36#include <system_error>
37#include <utility>
38
39using namespace toy;
40namespace cl = llvm::cl;
41
42static cl::opt<std::string> inputFilename(cl::Positional,
43 cl::desc("<input toy file>"),
44 cl::init(Val: "-"),
45 cl::value_desc("filename"));
46
47namespace {
48enum InputType { Toy, MLIR };
49} // namespace
50static cl::opt<enum InputType> inputType(
51 "x", cl::init(Val: Toy), cl::desc("Decided the kind of output desired"),
52 cl::values(clEnumValN(Toy, "toy", "load the input file as a Toy source.")),
53 cl::values(clEnumValN(MLIR, "mlir",
54 "load the input file as an MLIR file")));
55
56namespace {
57enum Action { None, DumpAST, DumpMLIR };
58} // namespace
59static cl::opt<enum Action> emitAction(
60 "emit", cl::desc("Select the kind of output desired"),
61 cl::values(clEnumValN(DumpAST, "ast", "output the AST dump")),
62 cl::values(clEnumValN(DumpMLIR, "mlir", "output the MLIR dump")));
63
64static cl::opt<bool> enableOpt("opt", cl::desc("Enable optimizations"));
65
66/// Returns a Toy AST resulting from parsing the file or a nullptr on error.
67std::unique_ptr<toy::ModuleAST> parseInputFile(llvm::StringRef filename) {
68 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> fileOrErr =
69 llvm::MemoryBuffer::getFileOrSTDIN(Filename: filename);
70 if (std::error_code ec = fileOrErr.getError()) {
71 llvm::errs() << "Could not open input file: " << ec.message() << "\n";
72 return nullptr;
73 }
74 auto buffer = fileOrErr.get()->getBuffer();
75 LexerBuffer lexer(buffer.begin(), buffer.end(), std::string(filename));
76 Parser parser(lexer);
77 return parser.parseModule();
78}
79
80int loadMLIR(llvm::SourceMgr &sourceMgr, mlir::MLIRContext &context,
81 mlir::OwningOpRef<mlir::ModuleOp> &module) {
82 // Handle '.toy' input to the compiler.
83 if (inputType != InputType::MLIR &&
84 !llvm::StringRef(inputFilename).ends_with(Suffix: ".mlir")) {
85 auto moduleAST = parseInputFile(filename: inputFilename);
86 if (!moduleAST)
87 return 6;
88 module = mlirGen(context, moduleAST&: *moduleAST);
89 return !module ? 1 : 0;
90 }
91
92 // Otherwise, the input is '.mlir'.
93 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> fileOrErr =
94 llvm::MemoryBuffer::getFileOrSTDIN(Filename: inputFilename);
95 if (std::error_code ec = fileOrErr.getError()) {
96 llvm::errs() << "Could not open input file: " << ec.message() << "\n";
97 return -1;
98 }
99
100 // Parse the input mlir.
101 sourceMgr.AddNewSourceBuffer(F: std::move(*fileOrErr), IncludeLoc: llvm::SMLoc());
102 module = mlir::parseSourceFile<mlir::ModuleOp>(sourceMgr, config: &context);
103 if (!module) {
104 llvm::errs() << "Error can't load file " << inputFilename << "\n";
105 return 3;
106 }
107 return 0;
108}
109
110int dumpMLIR() {
111 mlir::MLIRContext context;
112 // Load our Dialect in this MLIR Context.
113 context.getOrLoadDialect<mlir::toy::ToyDialect>();
114
115 mlir::OwningOpRef<mlir::ModuleOp> module;
116 llvm::SourceMgr sourceMgr;
117 mlir::SourceMgrDiagnosticHandler sourceMgrHandler(sourceMgr, &context);
118 if (int error = loadMLIR(sourceMgr, context, module))
119 return error;
120
121 if (enableOpt) {
122 mlir::PassManager pm(module.get()->getName());
123 // Apply any generic pass manager command line options and run the pipeline.
124 if (mlir::failed(Result: mlir::applyPassManagerCLOptions(pm)))
125 return 4;
126
127 // Add a run of the canonicalizer to optimize the mlir module.
128 pm.addNestedPass<mlir::toy::FuncOp>(mlir::createCanonicalizerPass());
129 if (mlir::failed(Result: pm.run(op: *module)))
130 return 4;
131 }
132
133 module->dump();
134 return 0;
135}
136
137int dumpAST() {
138 if (inputType == InputType::MLIR) {
139 llvm::errs() << "Can't dump a Toy AST when the input is MLIR\n";
140 return 5;
141 }
142
143 auto moduleAST = parseInputFile(filename: inputFilename);
144 if (!moduleAST)
145 return 1;
146
147 dump(*moduleAST);
148 return 0;
149}
150
151int main(int argc, char **argv) {
152 // Register any command line options.
153 mlir::registerAsmPrinterCLOptions();
154 mlir::registerMLIRContextCLOptions();
155 mlir::registerPassManagerCLOptions();
156
157 cl::ParseCommandLineOptions(argc, argv, Overview: "toy compiler\n");
158
159 switch (emitAction) {
160 case Action::DumpAST:
161 return dumpAST();
162 case Action::DumpMLIR:
163 return dumpMLIR();
164 default:
165 llvm::errs() << "No action specified (parsing only?), use -emit=<action>\n";
166 }
167
168 return 0;
169}
170

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source code of mlir/examples/toy/Ch3/toyc.cpp