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);
}
public Parser(List<Lexer.Lexeme> input)
{
Stream = new LexemeStream(input.ToArray());
}