1/*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20/*!
21 * \file token.h
22 * \brief A operator table for parsing.
23 *
24 * Provides symbolic token sequences to map to TVM operators, with a given associativity and arity.
25 */
26
27#ifndef TVM_PARSER_OP_TABLE_H_
28#define TVM_PARSER_OP_TABLE_H_
29
30#include <tvm/ir/op.h>
31#include <tvm/runtime/object.h>
32
33#include <fstream>
34#include <string>
35#include <unordered_map>
36#include <vector>
37
38#include "./tokenizer.h"
39
40namespace tvm {
41namespace parser {
42
43struct Rule {
44 std::vector<TokenType> tokens;
45 int precedence;
46 int arity;
47 tvm::Op op;
48 bool left_assoc;
49
50 Rule() : tokens(), precedence(0), arity(0), op(tvm::Op()), left_assoc(false) {}
51
52 Rule(std::vector<TokenType> tokens, tvm::Op op, int precedence, int arity = 2,
53 bool left_assoc = false)
54 : tokens(tokens), precedence(precedence), arity(arity), op(op), left_assoc(left_assoc) {}
55
56 Rule(const Rule& rule) {
57 this->tokens = rule.tokens;
58 this->op = rule.op;
59 this->precedence = rule.precedence;
60 this->arity = rule.arity;
61 this->left_assoc = rule.left_assoc;
62 }
63};
64
65struct OperatorTable {
66 std::vector<Rule> rules;
67 std::unordered_map<std::string, Rule> this_is_a_hack;
68
69 explicit OperatorTable(std::vector<Rule> rules) : rules(rules), this_is_a_hack() {
70 for (auto rule : rules) {
71 std::stringstream key;
72 for (auto token : rule.tokens) {
73 key << ToString(token);
74 }
75 this->this_is_a_hack.insert({key.str(), rule});
76 }
77 }
78};
79
80OperatorTable DefaultOpTable() {
81 return OperatorTable(
82 {Rule({TokenType::kStar}, Op::Get("multiply"), 12, 2, true),
83 Rule({TokenType::kDivision}, Op::Get("divide"), 12, 2, true),
84 Rule({TokenType::kPlus}, Op::Get("add"), 10, 2, true),
85 Rule({TokenType::kMinus}, Op::Get("subtract"), 10, 2, true),
86 Rule({TokenType::kLAngle}, Op::Get("less"), 8, 2, true),
87 Rule({TokenType::kLAngle, TokenType::kEqual}, Op::Get("less_equal"), 8, 2, true),
88 Rule({TokenType::kRAngle}, Op::Get("greater"), 8, 2, true),
89 Rule({TokenType::kRAngle, TokenType::kEqual}, Op::Get("greater_equal"), 8, 2, true),
90 Rule({TokenType::kEqual, TokenType::kEqual}, Op::Get("equal"), 7, 2, true),
91 Rule({TokenType::kBang, TokenType::kEqual}, Op::Get("not_equal"), 7, 2, true)});
92}
93
94} // namespace parser
95} // namespace tvm
96#endif // TVM_PARSER_OP_TABLE_H_
97