881f58d20c
Allow '/*...*/' and '//' comments to appear anywhere in HLO text, including multi-line comments. Previously only '/*...*/' comments were only allowed and only in certain locations in a serialized Literal. PiperOrigin-RevId: 208519204
132 lines
4.0 KiB
C++
132 lines
4.0 KiB
C++
/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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#ifndef TENSORFLOW_COMPILER_XLA_SERVICE_HLO_LEXER_H_
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#define TENSORFLOW_COMPILER_XLA_SERVICE_HLO_LEXER_H_
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#include <string>
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#include "tensorflow/compiler/xla/service/hlo_token.h"
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#include "tensorflow/compiler/xla/types.h"
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#include "tensorflow/compiler/xla/xla_data.pb.h"
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#include "tensorflow/core/lib/core/stringpiece.h"
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#include "tensorflow/core/platform/logging.h"
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#include "tensorflow/core/platform/regexp.h"
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#include "tensorflow/core/platform/types.h"
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namespace xla {
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// Lexer for the HloModule::ToString() format text.
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//
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// This class is meant to be used by hlo_parser.cc. You shouldn't need to use
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// it directly.
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class HloLexer {
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public:
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explicit HloLexer(tensorflow::StringPiece buf) : buf_(buf) {
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current_ptr_ = buf_.begin();
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}
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TokKind Lex() { return current_kind_ = LexToken(); }
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TokKind GetKind() const { return current_kind_; }
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string GetStrVal() const {
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switch (GetKind()) {
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case TokKind::kName:
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case TokKind::kAttributeName:
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case TokKind::kDimLabels:
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case TokKind::kDxD:
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case TokKind::kPad:
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case TokKind::kString:
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case TokKind::kIdent:
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return str_val_;
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default:
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LOG(FATAL) << "This token does not have string value";
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}
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}
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Shape GetShapeVal() const {
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CHECK(GetKind() == TokKind::kShape);
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return shape_val_;
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}
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tensorflow::int64 GetInt64Val() const {
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CHECK(GetKind() == TokKind::kInt);
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return int64_val_;
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}
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double GetDecimalVal() const {
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CHECK(GetKind() == TokKind::kDecimal);
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return decimal_val_;
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}
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typedef const char* LocTy;
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// Returns the location of the current token.
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LocTy GetLoc() const { return token_start_; }
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// Returns the line and column of a location in the buffer.
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std::pair<unsigned, unsigned> GetLineAndColumn(LocTy location) const;
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// Returns the whole line given the location.
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tensorflow::StringPiece GetLine(LocTy loc) const;
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private:
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// Returns the current character. If it's neither the end of input buffer nor
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// an invalid character, moves the pointer forward.
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int GetNextChar();
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// Returns the current character.
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int PeekCurrentChar() const;
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// Creates StringPiece with the given begin and end. Exits if the begin > end,
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// or it's out of the range of the current buffer.
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tensorflow::StringPiece StringPieceFromPointers(const char* begin,
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const char* end) const;
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tensorflow::RegexpStringPiece RegexpStringPieceFromPointers(
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const char* begin, const char* end) const;
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// Returns true if the given ptr is dereferenceable within the range of the
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// current buffer.
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bool CanDereference(const char* ptr) const;
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TokKind LexToken();
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TokKind LexIdentifier();
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TokKind LexPercent();
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TokKind LexShape();
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TokKind LexConstant();
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TokKind LexNumberOrPattern();
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TokKind LexString();
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const tensorflow::StringPiece buf_;
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const char* current_ptr_;
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// Information about the current token.
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const char* token_start_;
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TokKind current_kind_;
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string str_val_;
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Shape shape_val_;
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tensorflow::int64 int64_val_;
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double decimal_val_;
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struct LineNoCacheTy {
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const char* last_query;
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unsigned line_no_of_query;
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};
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// This caches the line number of the previous query.
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mutable LineNoCacheTy line_no_cache_{nullptr, 0};
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};
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} // namespace xla
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#endif // TENSORFLOW_COMPILER_XLA_SERVICE_HLO_LEXER_H_
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