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Posted to commits@tvm.apache.org by GitBox <gi...@apache.org> on 2020/07/01 01:14:42 UTC
[GitHub] [incubator-tvm] electriclilies commented on a change in pull request #5932: [Frontend][Relay] Add Parser 2.0
electriclilies commented on a change in pull request #5932:
URL: https://github.com/apache/incubator-tvm/pull/5932#discussion_r448050480
##########
File path: src/parser/tokenizer.h
##########
@@ -0,0 +1,460 @@
+/*
+ * 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.h
+ * \brief A parser for TVM IR.
+ */
+#ifndef TVM_PARSER_TOKENIZER_H_
+#define TVM_PARSER_TOKENIZER_H_
+
+#include <fstream>
+#include <tvm/runtime/object.h>
+#include <tvm/runtime/container.h>
+
+#include "./token.h"
+
+namespace tvm {
+namespace parser {
+
+using namespace runtime;
+
+bool IsDigit(char c) {
+ return '0' <= c && c <= '9';
+}
+
+bool IsWhitespace(char c) {
+ return ' ' == c || c == '\t' || c == '\n';
+}
+
+bool IsNumeric(char c) {
+ return (IsDigit(c) || c == '.' || c == 'e' || c == '-' || c == '+' || c == 'E') && !IsWhitespace(c);
+}
+
+bool IsIdentLetter(char c) {
+ return '_' == c || ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
+}
+
+bool IsIdent(char c) {
+ return IsIdentLetter(c) || IsDigit(c);
+}
+
+static std::unordered_map<std::string, TokenType> KEYWORD_TABLE = {
+ { "let", TokenType::Let },
+ { "fn", TokenType::Fn },
+ { "def", TokenType::Defn },
+ { "if", TokenType::If },
+ { "else", TokenType::Else },
+ { "type", TokenType::TypeDef },
+ { "match", TokenType::Match }
+};
+
+struct Tokenizer {
+ int pos;
+ int col;
+ int line;
+ char next_char;
+ const std::string& source;
+ std::vector<Token> tokens;
+
+ char Next() {
+ char c = this->source.at(this->pos);
+ if (c == '\n') {
+ this->line += 1;
+ this->col = 1;
+ } else {
+ this->col += 1;
+ }
+ pos += 1;
+ return c;
+ }
+
+ bool More() {
+ return this->pos < this->source.size();
+ }
+
+ char Peek() {
+ CHECK(pos < this->source.size());
+ return this->source.at(this->pos);
+ }
+
+ Token NewToken(TokenType token_type, ObjectRef data = ObjectRef()) {
+ return Token(this->line, this->col, token_type, data);
+ }
+
+ enum CommentParserState {
+ Proceed,
+ Forward,
+ Backward,
+ };
+
+ void MatchComment(std::string& buffer) {
+ // We only invoke this after we have matched the first start
+ // token assume, we are proceeding the parse forward with
+ // nesting = 1.
+ //
+ // When we are done we should be at nesting zero and be
+ // in the stop state.
+ CommentParserState state = CommentParserState::Proceed;
+ int nesting = 1;
+
+ while (true) {
+ switch (state) {
+ case CommentParserState::Proceed: {
+ if (Peek() == '/') {
+ state = CommentParserState::Forward;
+ } else if (Peek() == '*') {
+ state = CommentParserState::Backward;
+ }
+ buffer += Next();
+ continue;
+ }
+ case CommentParserState::Forward: {
+ if (Peek() == '*') {
+ nesting += 1;
+ buffer += Next();
+ }
+ state = CommentParserState::Proceed;
+ continue;
+ }
+ case CommentParserState::Backward: {
+ if (Peek() == '/') {
+ nesting -= 1;
+ if (nesting == 0) {
+ Next();
+ buffer.pop_back();
+ return;
+ } else {
+ buffer += Next();
+ state = CommentParserState::Proceed;
+ };
+ }
+ continue;
+ }
+ }
+ }
+ }
+
+ Token ParseNumber(bool is_pos, std::string number) {
+ CHECK(number.size() > 0)
+ << "an empty string is an invalid number";
+
+ try {
+ auto token = NewToken(TokenType::Integer);
+ size_t index = 0;
+ int value = std::stoi(number, &index);
+ if (number.size() > index) {
+ throw std::invalid_argument("floating point");
+ }
+ value = is_pos ? value : -value;
+ token->data = tvm::Integer(value);
+ return token;
+ } catch (const std::invalid_argument& ia) {
+ auto token = NewToken(TokenType::Float);
+
+ if (number.back() == 'f') {
+ number.pop_back();
+ }
+
+ double value = stod(number);
+ value = is_pos ? value : -value;
+ token->data = tvm::FloatImm(DataType::Float(64), value);
+ return token;
+ }
+ }
+
+ inline Token TokenizeOnce() {
+ auto next = Peek();
+ if (next == '\n') {
+ auto token = NewToken(TokenType::Newline);
+ Next();
+ return token;
+ } else if (this->Peek() == '\r' && this->Peek() == '\n') {
Review comment:
This is weird to me -- why are you getting this->Peek() when you already put it in next? Also, a character can't be '/r' and '/n' at the same time so it's dead code
##########
File path: src/parser/parser.cc
##########
@@ -0,0 +1,1103 @@
+/*
+ * 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 "./diagnostic.h"
+#include "./op_table.h"
+#include "./tokenizer.h"
+
+namespace tvm {
+namespace parser {
+
+using namespace relay;
+using Expr = relay::Expr;
+
+// 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
+// ;
+
+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);
+}
+
+template<typename T>
+struct Scope {
+ std::unordered_map<std::string, T> name_map;
+ Scope() : name_map() {}
+};
+
+template<typename T>
+struct ScopeStack {
+ std::vector<Scope<T>> scope_stack;
+
+ void Add(const std::string& name, const T& value) {
+ if (!this->scope_stack.size()) {
+ LOG(FATAL) << "internal issue";
+ }
+ this->scope_stack.back().name_map.insert({ name, value });
+ }
+
+ T Lookup(const std::string& name) {
+ for (auto scope = this->scope_stack.rbegin(); scope != this->scope_stack.rend(); scope++) {
+ auto it = scope->name_map.find(name);
+ if (it != scope->name_map.end()) {
+ return it->second;
+ }
+ }
+ return T();
+ }
+
+ void PushStack() {
+ this->scope_stack.push_back(Scope<T>());
+ }
+
+ void PopStack() {
+ this->scope_stack.pop_back();
+ }
+};
+
+template<typename T>
+struct InternTable {
+ std::unordered_map<std::string, T> table;
+ void Add(const std::string& name, const T& t) {
+ auto it = table.find(name);
+ if (it != table.end()) {
+ LOG(FATAL) << "duplicate name";
+ } else {
+ table.insert({ name, t});
+ }
+ }
+
+ T Get(const std::string& name) {
+ auto it = table.find(name);
+ if (it != table.end()) {
+ return it->second;
+ } else {
+ return T();
+ }
+ }
+};
+
Review comment:
More doc in this file would be helpful in general, I'm having trouble seeing how all the classes fit together
##########
File path: src/parser/parser.cc
##########
@@ -0,0 +1,1103 @@
+/*
+ * 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 "./diagnostic.h"
+#include "./op_table.h"
+#include "./tokenizer.h"
+
+namespace tvm {
+namespace parser {
+
+using namespace relay;
+using Expr = relay::Expr;
+
+// 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
+// ;
+
+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);
+}
+
+template<typename T>
+struct Scope {
+ std::unordered_map<std::string, T> name_map;
+ Scope() : name_map() {}
+};
+
+template<typename T>
+struct ScopeStack {
+ std::vector<Scope<T>> scope_stack;
+
+ void Add(const std::string& name, const T& value) {
+ if (!this->scope_stack.size()) {
+ LOG(FATAL) << "internal issue";
+ }
+ this->scope_stack.back().name_map.insert({ name, value });
+ }
+
+ T Lookup(const std::string& name) {
+ for (auto scope = this->scope_stack.rbegin(); scope != this->scope_stack.rend(); scope++) {
+ auto it = scope->name_map.find(name);
+ if (it != scope->name_map.end()) {
+ return it->second;
+ }
+ }
+ return T();
+ }
+
+ void PushStack() {
+ this->scope_stack.push_back(Scope<T>());
+ }
+
+ void PopStack() {
+ this->scope_stack.pop_back();
+ }
+};
+
+template<typename T>
+struct InternTable {
+ std::unordered_map<std::string, T> table;
+ void Add(const std::string& name, const T& t) {
+ auto it = table.find(name);
+ if (it != table.end()) {
+ LOG(FATAL) << "duplicate name";
+ } else {
+ table.insert({ name, t});
+ }
+ }
+
+ T Get(const std::string& name) {
+ auto it = table.find(name);
+ if (it != table.end()) {
+ return it->second;
+ } else {
+ return T();
+ }
+ }
+};
+
+struct Parser {
+ /*! \brief The diagnostic context used for error reporting. */
+ DiagnosticContext diag_ctx;
+
+ /*! \brief The current position in the token stream. */
+ int pos;
+
+ /*! \brief The token stream for the parser. */
+ std::vector<Token> tokens;
+
+ /*! \brief The configured operator table. */
+ OperatorTable op_table;
+
+ /*! \brief Configure the whitespace mode, right now we ignore all whitespace. */
+ bool ignore_whitespace;
+
+ /*! \brief A global mapping for GlobalVar. */
+ InternTable<GlobalVar> global_names;
+
+ /*! \brief A global mapping for type definitions. */
+ InternTable<GlobalTypeVar> type_names;
+
+ /*! \brief A mapping from graph variable to expression, i.e., `%0 = expr`. */
+ std::unordered_map<int, Expr> graph_ctx;
+
+ /*! \brief The set of type scopes used for generics. */
+ ScopeStack<TypeVar> type_scopes;
+
+ /*! \brief The set of expression scopes used for lexical scope. */
+ ScopeStack<Var> expr_scopes;
+
+ Parser(std::vector<Token> tokens, OperatorTable op_table, Source source)
+ : diag_ctx(source), pos(0), tokens(tokens), op_table(op_table), ignore_whitespace(true) {}
+
+ 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)
Review comment:
CHECK_GT(n, 1) equivalent and clearer, but ensures that n > 1, in direct contradiction to the error message on next line..
##########
File path: src/parser/parser.cc
##########
@@ -0,0 +1,1103 @@
+/*
+ * 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 "./diagnostic.h"
+#include "./op_table.h"
+#include "./tokenizer.h"
+
+namespace tvm {
+namespace parser {
+
+using namespace relay;
+using Expr = relay::Expr;
+
+// 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
+// ;
+
+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);
+}
+
+template<typename T>
+struct Scope {
+ std::unordered_map<std::string, T> name_map;
+ Scope() : name_map() {}
+};
+
+template<typename T>
+struct ScopeStack {
+ std::vector<Scope<T>> scope_stack;
+
+ void Add(const std::string& name, const T& value) {
+ if (!this->scope_stack.size()) {
+ LOG(FATAL) << "internal issue";
+ }
+ this->scope_stack.back().name_map.insert({ name, value });
+ }
+
+ T Lookup(const std::string& name) {
+ for (auto scope = this->scope_stack.rbegin(); scope != this->scope_stack.rend(); scope++) {
+ auto it = scope->name_map.find(name);
+ if (it != scope->name_map.end()) {
+ return it->second;
+ }
+ }
+ return T();
+ }
+
+ void PushStack() {
+ this->scope_stack.push_back(Scope<T>());
+ }
+
+ void PopStack() {
+ this->scope_stack.pop_back();
+ }
+};
+
+template<typename T>
+struct InternTable {
+ std::unordered_map<std::string, T> table;
+ void Add(const std::string& name, const T& t) {
+ auto it = table.find(name);
+ if (it != table.end()) {
+ LOG(FATAL) << "duplicate name";
+ } else {
+ table.insert({ name, t});
+ }
+ }
+
+ T Get(const std::string& name) {
+ auto it = table.find(name);
+ if (it != table.end()) {
+ return it->second;
+ } else {
+ return T();
+ }
+ }
+};
+
+struct Parser {
+ /*! \brief The diagnostic context used for error reporting. */
+ DiagnosticContext diag_ctx;
+
+ /*! \brief The current position in the token stream. */
+ int pos;
+
+ /*! \brief The token stream for the parser. */
+ std::vector<Token> tokens;
+
+ /*! \brief The configured operator table. */
+ OperatorTable op_table;
+
+ /*! \brief Configure the whitespace mode, right now we ignore all whitespace. */
+ bool ignore_whitespace;
+
+ /*! \brief A global mapping for GlobalVar. */
+ InternTable<GlobalVar> global_names;
+
+ /*! \brief A global mapping for type definitions. */
+ InternTable<GlobalTypeVar> type_names;
+
+ /*! \brief A mapping from graph variable to expression, i.e., `%0 = expr`. */
+ std::unordered_map<int, Expr> graph_ctx;
+
+ /*! \brief The set of type scopes used for generics. */
+ ScopeStack<TypeVar> type_scopes;
+
+ /*! \brief The set of expression scopes used for lexical scope. */
+ ScopeStack<Var> expr_scopes;
+
+ Parser(std::vector<Token> tokens, OperatorTable op_table, Source source)
+ : diag_ctx(source), pos(0), tokens(tokens), op_table(op_table), ignore_whitespace(true) {}
+
+ 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) {
Review comment:
Why does this fn have arguments? You prevent lookahead of more than 1, so the only arguments that work are args <= 0, which just return Peek() and doesn't update pos, or 1
##########
File path: src/parser/parser.cc
##########
@@ -0,0 +1,1103 @@
+/*
+ * 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 "./diagnostic.h"
+#include "./op_table.h"
+#include "./tokenizer.h"
+
+namespace tvm {
+namespace parser {
+
+using namespace relay;
+using Expr = relay::Expr;
+
+// 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
+// ;
+
+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);
+}
+
+template<typename T>
+struct Scope {
+ std::unordered_map<std::string, T> name_map;
+ Scope() : name_map() {}
+};
+
+template<typename T>
+struct ScopeStack {
+ std::vector<Scope<T>> scope_stack;
+
+ void Add(const std::string& name, const T& value) {
+ if (!this->scope_stack.size()) {
+ LOG(FATAL) << "internal issue";
+ }
+ this->scope_stack.back().name_map.insert({ name, value });
+ }
+
+ T Lookup(const std::string& name) {
+ for (auto scope = this->scope_stack.rbegin(); scope != this->scope_stack.rend(); scope++) {
+ auto it = scope->name_map.find(name);
+ if (it != scope->name_map.end()) {
+ return it->second;
+ }
+ }
+ return T();
+ }
+
+ void PushStack() {
+ this->scope_stack.push_back(Scope<T>());
+ }
+
+ void PopStack() {
+ this->scope_stack.pop_back();
+ }
+};
+
+template<typename T>
+struct InternTable {
+ std::unordered_map<std::string, T> table;
+ void Add(const std::string& name, const T& t) {
+ auto it = table.find(name);
+ if (it != table.end()) {
+ LOG(FATAL) << "duplicate name";
+ } else {
+ table.insert({ name, t});
+ }
+ }
+
+ T Get(const std::string& name) {
+ auto it = table.find(name);
+ if (it != table.end()) {
+ return it->second;
+ } else {
+ return T();
+ }
+ }
+};
+
+struct Parser {
+ /*! \brief The diagnostic context used for error reporting. */
+ DiagnosticContext diag_ctx;
+
+ /*! \brief The current position in the token stream. */
+ int pos;
+
+ /*! \brief The token stream for the parser. */
+ std::vector<Token> tokens;
+
+ /*! \brief The configured operator table. */
+ OperatorTable op_table;
+
+ /*! \brief Configure the whitespace mode, right now we ignore all whitespace. */
+ bool ignore_whitespace;
+
+ /*! \brief A global mapping for GlobalVar. */
+ InternTable<GlobalVar> global_names;
+
+ /*! \brief A global mapping for type definitions. */
+ InternTable<GlobalTypeVar> type_names;
+
+ /*! \brief A mapping from graph variable to expression, i.e., `%0 = expr`. */
+ std::unordered_map<int, Expr> graph_ctx;
+
+ /*! \brief The set of type scopes used for generics. */
+ ScopeStack<TypeVar> type_scopes;
+
+ /*! \brief The set of expression scopes used for lexical scope. */
+ ScopeStack<Var> expr_scopes;
+
+ Parser(std::vector<Token> tokens, OperatorTable op_table, Source source)
+ : diag_ctx(source), pos(0), tokens(tokens), op_table(op_table), ignore_whitespace(true) {}
+
+ 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++) {
Review comment:
If n = 1, i < (n -1) becomes i < 0 -- so the loop won't execute when i = 1. Change to i < n or i <= n-1
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