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From GitBox <...@apache.org>
Subject [GitHub] [incubator-tvm] weberlo commented on a change in pull request #5932: [Frontend][Relay] Add Parser 2.0
Date Fri, 26 Jun 2020 19:54:12 GMT

weberlo commented on a change in pull request #5932:
URL: https://github.com/apache/incubator-tvm/pull/5932#discussion_r446348563



##########
File path: src/parser/parser.cc
##########
@@ -0,0 +1,968 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/*!
+ * \file parser.cc
+ * \brief A parser for TVM IR.
+ */
+#include <tvm/ir/module.h>
+#include <tvm/relay/expr.h>
+#include <tvm/relay/function.h>
+#include <tvm/runtime/object.h>
+#include <tvm/runtime/registry.h>
+#include <tvm/node/reflection.h>
+
+#include <fstream>
+
+#include "./tokenizer.h"
+
+namespace tvm {
+namespace parser {
+
+using namespace relay;
+using Expr = relay::Expr;
+
+// expr
+//   // operators
+//   : '(' expr ')'                             # paren
+//   // function application
+//   | expr '(' callList ')'                    # call
+//   | '-' expr                                 # neg
+//   | expr op=('*'|'/') expr                   # binOp
+//   | expr op=('+'|'-') expr                   # binOp
+//   | expr op=('<'|'>'|'<='|'>=') expr         # binOp
+//   | expr op=('=='|'!=') expr                 # binOp
+//   // function definition
+//   | func                                     # funcExpr
+//   // tuples and tensors
+//   | '(' ')'                                  # tuple
+//   | '(' expr ',' ')'                         # tuple
+//   | '(' expr (',' expr)+ ')'                 # tuple
+//   | '[' (expr (',' expr)*)? ']'              # tensor
+//   | 'if' '(' expr ')' body 'else' body       # ifElse
+//   | matchType expr '{' matchClauseList? '}'  # match
+//   | expr '.' NAT                             # projection
+//   // sequencing
+//   | 'let' var '=' expr ';' expr              # let
+//   // sugar for let %_ = expr; expr
+//   | expr ';;' expr                           # let
+//   | graphVar '=' expr ';' expr               # graph
+//   | ident                                    # identExpr
+//   | scalar                                   # scalarExpr
+//   | meta                                     # metaExpr
+//   | QUOTED_STRING                            # stringExpr
+//   ;
+
+// func: 'fn' typeParamList? '(' argList ')' ('->' typeExpr)? body ;
+// defn
+//   : 'def' globalVar typeParamList? '(' argList ')' ('->' typeExpr)? body  # funcDefn
+//   | 'extern' 'type' generalIdent typeParamList?                           # externAdtDefn
+//   | 'type' generalIdent typeParamList? '{' adtConsDefnList? '}'           # adtDefn
+//   ;
+
+// constructorName: CNAME ;
+
+// adtConsDefnList: adtConsDefn (',' adtConsDefn)* ','? ;
+// adtConsDefn: constructorName ('(' typeExpr (',' typeExpr)* ')')? ;
+// matchClauseList: matchClause (',' matchClause)* ','? ;
+// matchClause: pattern '=>' ('{' expr '}' | expr) ;
+// // complete or incomplete match, respectively
+// matchType : 'match' | 'match?' ;
+
+// patternList: '(' pattern (',' pattern)* ')';
+// pattern
+//   : '_'                             # wildcardPattern
+//   | localVar (':' typeExpr)?        # varPattern
+//   | constructorName patternList?    # constructorPattern
+//   | patternList                     # tuplePattern
+//   ;
+
+// adtCons: constructorName adtConsParamList? ;
+// adtConsParamList: '(' adtConsParam (',' adtConsParam)* ')' ;
+// adtConsParam: localVar | constructorName ;
+
+// argList
+//   : varList             # argNoAttr
+//   | (var ',')* attrSeq  # argWithAttr
+//   ;
+
+// varList: (var (',' var)*)? ;
+// var: localVar (':' typeExpr)? ;
+
+// attrSeq: attr (',' attr)* ;
+// attr: CNAME '=' expr ;
+
+// typeExpr
+//   : '(' ')'                                                                # tupleType
+//   | '(' typeExpr ')'                                                       # typeParen
+//   | '(' typeExpr ',' ')'                                                   # tupleType
+//   | '(' typeExpr (',' typeExpr)+ ')'                                       # tupleType
+//   | generalIdent typeParamList                                             # typeCallType
+//   | generalIdent                                                           # typeIdentType
+//   | 'Tensor' '[' shapeList ',' typeExpr ']'                                # tensorType
+//   | 'fn' typeParamList? '(' (typeExpr (',' typeExpr)*)? ')' '->' typeExpr  # funcType
+//   | '_'                                                                    # incompleteType
+//   ;
+
+// typeParamList: '[' typeExpr (',' typeExpr)* ']' ;
+
+// shapeList
+//   : '(' ')'
+//   | '(' shape (',' shape)+ ')'
+//   | shape
+//   ;
+
+// meta : 'meta' '[' CNAME ']' '[' NAT ']';
+
+// shape
+//   : meta           # metaShape
+//   | '(' shape ')'  # parensShape
+//   | NAT            # intShape
+//   ;
+
+
+struct GlobalFunc {
+  GlobalVar global;
+  Function function;
+  GlobalFunc() : global(), function() {}
+  GlobalFunc(GlobalVar global, Function function) : global(global), function(function) {}
+  GlobalFunc(const GlobalFunc& gfunc) {
+    this->global = gfunc.global;
+    this->function = gfunc.function;
+  }
+};
+
+struct Definitions {
+  std::vector<GlobalFunc> funcs;
+  std::vector<TypeData> types;
+};
+
+struct SemVer {
+  int major;
+  int minor;
+  int patch;
+};
+
+class MetaRefExpr;
+class MetaRefExprNode : public TempExprNode {
+ public:
+  std::string type_key;
+  uint64_t node_index;
+
+  void VisitAttrs(tvm::AttrVisitor* v) {}
+
+  Expr Realize() const final { return Expr(); }
+
+  static constexpr const char* _type_key = "relay.MetaRefExpr";
+  TVM_DECLARE_FINAL_OBJECT_INFO(MetaRefExprNode, TempExprNode);
+};
+
+class MetaRefExpr : public TempExpr {
+ public:
+  /*!
+   * \brief The constructor
+   * \param expr The original relay expression.
+   * \param kind The annotation kind.
+   */
+  TVM_DLL MetaRefExpr(std::string type_key, uint64_t node_index);
+
+  TVM_DEFINE_OBJECT_REF_METHODS(MetaRefExpr, TempExpr, MetaRefExprNode);
+};
+
+MetaRefExpr::MetaRefExpr(std::string type_key, uint64_t node_index) {
+  auto rnode = make_object<MetaRefExprNode>();
+  rnode->type_key = type_key;
+  rnode->node_index = node_index;
+  data_ = std::move(rnode);
+}
+
+struct Rule {
+  std::vector<TokenType> tokens;
+  int precedence;
+  int arity;
+  tvm::Op op;
+  bool left_assoc;
+
+  Rule() : tokens(), precedence(0), arity(0), op(tvm::Op()), left_assoc(false) {}
+
+  Rule(std::vector<TokenType> tokens, tvm::Op op, int precedence, int arity = 2, bool
left_assoc = false)
+      : tokens(tokens), precedence(precedence), arity(arity), op(op), left_assoc(false) {}
+
+  Rule(const Rule& rule) {
+    this->tokens = rule.tokens;
+    this->op = rule.op;
+    this->precedence = rule.precedence;
+    this->arity = rule.arity;
+    this->left_assoc = rule.left_assoc;
+  }
+};
+
+
+struct OperatorTable {
+  std::vector<Rule> rules;
+  std::unordered_map<std::string, Rule> this_is_a_hack;
+
+  OperatorTable(std::vector<Rule> rules) : rules(rules), this_is_a_hack() {
+    for (auto rule : rules) {
+      std::stringstream key;
+      for (auto token : rule.tokens) {
+        key << ToString(token);
+      }
+      this->this_is_a_hack.insert({ key.str(), rule });
+    }
+  }
+};
+
+struct Scope {
+  std::unordered_map<std::string, Var> name_map;
+  Scope() : name_map() {}
+};
+
+struct Parser {
+  int pos;
+  std::vector<Token> tokens;
+  OperatorTable op_table;
+  bool ignore_whitespace;
+
+  std::unordered_map<int, Expr> graph_ctx;
+  std::vector<Scope> scopes = { Scope() };
+
+  Parser(std::vector<Token> tokens, OperatorTable op_table)
+      : pos(0), tokens(tokens), op_table(op_table) {
+        // DisplayNextN(100);
+  }
+
+  void DisplayNextN(int n) {
+    std::cout << "remaining tokens: " << std::endl;
+    auto bound = std::min(pos + n, (int)tokens.size());
+    for (int i = 0; i < bound - pos; i++) {
+      std::cout << tokens[pos + i] << std::endl;
+    }
+  }
+
+  Token Peek() {
+    // For now we ignore all whitespace tokens and comments.
+    // We can tweak this behavior later to enable white space sensitivity in the parser.
+    while (pos < tokens.size() &&
+           ignore_whitespace && (tokens.at(pos)->token_type == TokenType::Whitespace
||
+                                 tokens.at(pos)->token_type == TokenType::Newline ||
+                                 tokens.at(pos)->token_type == TokenType::LineComment
||
+                                 tokens.at(pos)->token_type == TokenType::Comment)) {
+      // std::cout << "pos: " << pos << std::endl;
+      // std::cout << "tokens: " << tokens.size() << std::endl;
+      pos++;
+    }
+
+    if (pos < tokens.size()) {
+      return Token(this->tokens.at(pos));
+    } else {
+      return Token::Null();
+    }
+  }
+
+  // Allow lookahead into the token stream.
+  Token Lookahead(int n) {
+    CHECK_LE(1, n)
+      << "lookahead by > 1 is invalid";
+
+    auto old_pos = pos;
+    for (int i = 0; i < n - 1; i++) {
+      Peek();
+      pos++;
+    }
+
+    auto tok = Peek();
+    pos = old_pos;
+    return tok;
+  }
+
+  void Consume(const TokenType& token) {
+    if (tokens[pos]->token_type != token) {
+      throw std::runtime_error(
+          "expected a " + ToString(token) + " found " + ToString(Peek()->token_type) +
" at " +
+          std::to_string(tokens[pos]->line) + ":" + std::to_string(tokens[pos]->column));
+    }
+    pos++;
+  }
+
+  Token Match(const TokenType& token_type) {
+    auto tok = Peek();
+    Consume(token_type);
+    return tok;
+  }
+
+  bool WhenMatch(const TokenType& token_type) {
+    if (Peek()->token_type == token_type) {
+      Consume(token_type);
+      return true;
+    } else {
+      return false;
+    }
+  }
+
+  void AddGraphBinding(const Token& token, const Expr& expr) {
+    auto graph_no = token.ToNumber();
+    this->graph_ctx.insert({graph_no, expr});
+  }
+
+  Expr LookupGraphBinding(const Token& token) {
+    auto graph_no = token.ToNumber();
+    return this->graph_ctx.at(graph_no);
+  }
+
+  Var BindVar(std::string name, relay::Type type_annotation) {
+    auto var = Var(name, type_annotation);
+    this->scopes.back().name_map.insert({name, var});
+    return var;
+  }
+
+  Var LookupVarByString(const std::string& var) {
+    for (auto scope = this->scopes.rbegin(); scope != this->scopes.rend(); scope++)
{
+      auto it = scope->name_map.find(var);
+      if (it != scope->name_map.end()) {
+        return it->second;
+      }
+    }
+    LOG(FATAL) << "foo";
+    return Var();
+  }
+
+  void PushScope() {
+    this->scopes.push_back(Scope());
+  }
+
+  void PopScope(int n) {

Review comment:
       rename to `PopScopes`




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