Esempio n. 1
0
            private void AdvanceInstructionPosition(LexemeStream lexemeStream, int instructionPointer)
            {
                StartPosition           = SeekableInstructionReader.Position;
                StartInstructionPointer = instructionPointer;

                var lexemeIndex     = instructionPointer & LocalIndexMask;
                var lexemePageIndex = instructionPointer >> PageIndexShift;

                EnsurePagesCapacity(lexemePageIndex + 1);

                for (var iPage = lexemeStream.HeadPage; iPage <= lexemePageIndex; iPage++)
                {
                    InstructionReader.RentBuffers(PageSize, out var instructionsBuffer, out var operandsBuffer);

                    var pageSource = lexemeStream.Pages[iPage];
                    var pageCopy   = new InstructionPage(instructionsBuffer, operandsBuffer, pageSource.PageIndex, pageSource.PageLength);

                    Array.Copy(pageSource.InstructionsBuffer, 0, pageCopy.InstructionsBuffer, 0, pageCopy.PageLength);
                    Array.Copy(pageSource.OperandsBuffer, 0, pageCopy.OperandsBuffer, 0, pageCopy.PageLength);

                    pageCopy.ReferenceCount = pageSource.ReferenceCount;

                    Pages[pageCopy.PageIndex] = pageCopy;
                }

                var lexemePage = Pages[lexemePageIndex];

                lexemePage.PageLength = lexemeIndex;

                for (var i = lexemeIndex; i < PageSize; i++)
                {
                    lexemePage.OperandsBuffer[i]     = int.MinValue;
                    lexemePage.InstructionsBuffer[i] = default;
                }

                HeadPage  = lexemeStream.HeadPage;
                PageCount = lexemePageIndex + 1;

                ReadOperand(ref instructionPointer);
            }
Esempio n. 2
0
 public Parser(List<Lexer.Lexeme> input)
 {
     Stream = new LexemeStream(input.ToArray());
 }