1 | namespace HeuristicLab.Problems.ProgramSynthesis.Push.Interpreter {
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2 | using System;
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3 | using System.Collections.Generic;
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4 | using System.Runtime.CompilerServices;
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5 | using System.Threading;
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6 | using System.Threading.Tasks;
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7 | using Attributes;
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8 | using Configuration;
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9 | using Core;
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10 | using Expressions;
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11 | using Parser;
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12 | using Random;
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13 | using Stack;
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14 |
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15 |
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16 | public class PushInterpreter : IInternalPushInterpreter, IDisposable {
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17 | private Task currentTask;
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18 | private Expression currentProgram;
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19 |
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20 | public PushInterpreter(IReadOnlyPushConfiguration config = null, IRandom random = null, InterpreterPoolContainer poolContainer = null) {
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21 | Random = random ?? new MersenneTwister();
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22 | Configuration = config ?? new PushConfiguration();
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23 |
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24 | // setting the capacity of the Stacks to max points ensures that there will be enough memory at runtime
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25 | ExecStack = new PushStack<Expression>(Configuration.MaxPointsInProgram);
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26 | CodeStack = new PushStack<Expression>();
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27 | NameStack = new PushStack<string>();
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28 | BooleanStack = new PushStack<bool>();
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29 | IntegerStack = new PushStack<long>();
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30 | FloatStack = new PushStack<double>();
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31 | CharStack = new PushStack<char>();
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32 | StringStack = new PushStack<string>();
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33 | IntegerVectorStack = new PushStack<IReadOnlyList<long>>();
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34 | FloatVectorStack = new PushStack<IReadOnlyList<double>>();
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35 | BooleanVectorStack = new PushStack<IReadOnlyList<bool>>();
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36 | StringVectorStack = new PushStack<IReadOnlyList<string>>();
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37 | PrintStack = new PushStack<string>();
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38 |
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39 | Stacks = new Dictionary<StackTypes, IPushStack> {
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40 | { StackTypes.Exec, ExecStack },
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41 | { StackTypes.Code, CodeStack },
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42 | { StackTypes.Integer, IntegerStack },
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43 | { StackTypes.Float, FloatStack },
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44 | { StackTypes.Boolean, BooleanStack },
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45 | { StackTypes.Char, CharStack },
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46 | { StackTypes.String, StringStack },
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47 | { StackTypes.Name, NameStack },
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48 | { StackTypes.Print, PrintStack },
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49 | { StackTypes.IntegerVector, IntegerVectorStack },
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50 | { StackTypes.FloatVector, FloatVectorStack },
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51 | { StackTypes.BooleanVector, BooleanVectorStack },
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52 | { StackTypes.StringVector, StringVectorStack },
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53 | };
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54 |
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55 | CustomExpressions = new Dictionary<string, Expression>();
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56 | PoolContainer = poolContainer ?? new InterpreterPoolContainer();
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57 |
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58 | ConfigureStacks();
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59 | }
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60 |
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61 | public PushInterpreter(int seed, IReadOnlyPushConfiguration config = null)
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62 | : this(config, new FastRandom(seed)) {
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63 | }
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64 |
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65 | public IReadOnlyDictionary<StackTypes, IPushStack> Stacks { get; private set; }
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66 |
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67 | public IRandom Random { get; set; }
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68 |
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69 | public long ExecCounter { get; private set; }
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70 |
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71 | public bool IsPaused { get; private set; }
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72 |
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73 | public bool IsAborted { get; private set; }
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74 |
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75 | public bool IsRunning
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76 | {
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77 | get
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78 | {
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79 | return !ExecStack.IsEmpty &&
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80 | !IsPaused &&
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81 | !IsAborted &&
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82 | (ExecCounter < Configuration.EvalPushLimit);
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83 | }
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84 | }
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85 |
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86 | public bool IsCompleted
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87 | {
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88 | get
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89 | {
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90 | return ExecStack.IsEmpty || ExecCounter >= Configuration.EvalPushLimit;
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91 | }
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92 | }
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93 |
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94 | public bool CanStep
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95 | {
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96 | get
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97 | {
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98 | return !IsCompleted && !IsAborted && IsPaused;
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99 | }
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100 | }
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101 |
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102 | public InterpreterPoolContainer PoolContainer { get; private set; }
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103 |
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104 | public IReadOnlyPushConfiguration Configuration { get; protected set; }
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105 | [PushStack(StackTypes.Code)]
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106 | public IPushStack<Expression> CodeStack { get; private set; }
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107 | [PushStack(StackTypes.Exec)]
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108 | public IPushStack<Expression> ExecStack { get; private set; }
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109 | [PushStack(StackTypes.Name)]
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110 | public IPushStack<string> NameStack { get; private set; }
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111 | [PushStack(StackTypes.Boolean)]
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112 | public IPushStack<bool> BooleanStack { get; private set; }
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113 | [PushStack(StackTypes.Integer)]
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114 | public IPushStack<long> IntegerStack { get; private set; }
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115 | [PushStack(StackTypes.Float)]
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116 | public IPushStack<double> FloatStack { get; private set; }
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117 | [PushStack(StackTypes.Char)]
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118 | public IPushStack<char> CharStack { get; private set; }
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119 | [PushStack(StackTypes.String)]
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120 | public IPushStack<string> StringStack { get; private set; }
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121 | [PushStack(StackTypes.IntegerVector)]
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122 | public IPushStack<IReadOnlyList<long>> IntegerVectorStack { get; private set; }
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123 | [PushStack(StackTypes.FloatVector)]
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124 | public IPushStack<IReadOnlyList<double>> FloatVectorStack { get; private set; }
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125 | [PushStack(StackTypes.BooleanVector)]
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126 | public IPushStack<IReadOnlyList<bool>> BooleanVectorStack { get; private set; }
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127 | [PushStack(StackTypes.StringVector)]
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128 | public IPushStack<IReadOnlyList<string>> StringVectorStack { get; private set; }
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129 | [PushStack(StackTypes.Print)]
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130 | public IPushStack<string> PrintStack { get; private set; }
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131 |
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132 | public IDictionary<string, Expression> CustomExpressions { get; private set; }
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133 |
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134 | public bool IsNameQuoteFlagSet { get; set; }
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135 |
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136 | public Task RunAsync(string code, CancellationToken token = default(CancellationToken)) {
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137 | var program = PushParser.Parse(code);
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138 | currentTask = RunAsync(program, token);
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139 | return currentTask;
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140 | }
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141 | public async Task RunAsync(Expression expression, CancellationToken token = default(CancellationToken)) {
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142 | await Task.Run(() => Run(expression), token);
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143 | }
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144 |
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145 | public void Run(string code, bool stepwise = false) {
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146 | var program = PushParser.Parse(code);
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147 | Run(program, stepwise);
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148 | }
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149 |
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150 | public void Run(bool stepwise) {
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151 | Run(PushProgram.Empty, stepwise);
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152 | }
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153 |
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154 | public void Run(Expression expression, bool stepwise = false) {
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155 | IsPaused = stepwise;
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156 | currentProgram = expression;
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157 |
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158 | /* Push top expression so the loop is able to enter
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159 | * If the top expression is a single statement it gets evaluated in Run.
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160 | * Otherwise the push program will be evaluated and the expressions of the program are pushed onto the EXEC stack.
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161 | * Expanding the initial program is not counted in ExecCount */
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162 | InitRun(expression);
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163 |
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164 | if (Configuration.TopLevelPushCode && CodeStack.IsEnabled)
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165 | CodeStack.Push(expression);
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166 |
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167 | Run();
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168 | }
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169 |
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170 | public bool CanRun(int count) {
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171 | return ExecStack.Count >= count &&
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172 | !IsPaused &&
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173 | !IsAborted &&
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174 | ExecCounter + count < Configuration.EvalPushLimit;
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175 | }
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176 |
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177 | public async Task AbortAsync() {
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178 | if (IsAborted || IsCompleted) return;
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179 |
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180 | IsAborted = true;
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181 |
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182 | PoolContainer.DisposePools();
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183 |
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184 | if (currentTask != null) await currentTask;
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185 | }
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186 |
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187 | public async Task AbortAndResetAsync() {
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188 | await AbortAsync();
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189 | Reset();
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190 | }
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191 |
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192 | public async Task PauseAsync() {
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193 | if (IsPaused || IsCompleted) return;
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194 |
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195 | IsPaused = true;
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196 |
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197 | if (currentTask != null) await currentTask;
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198 | }
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199 |
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200 | public async Task ResumeAsync() {
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201 | if (IsPaused || !IsAborted) {
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202 | IsPaused = false;
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203 | await InterpretAsync();
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204 | } else await currentTask;
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205 | }
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206 |
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207 | public void Resume() {
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208 | if (!IsPaused && IsAborted)
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209 | return;
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210 |
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211 | IsPaused = false;
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212 | Run();
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213 | }
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214 |
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215 | [MethodImpl(MethodImplOptions.AggressiveInlining)]
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216 | public bool Step() {
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217 | if (!CanStep) return false;
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218 |
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219 | var successful = DoStep();
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220 |
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221 | if (IsCompleted)
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222 | Finally();
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223 |
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224 | return successful;
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225 | }
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226 |
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227 | [MethodImpl(MethodImplOptions.AggressiveInlining)]
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228 | public void Step(int count) {
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229 | for (var i = 0u; i < count; i++) Step();
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230 | }
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231 |
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232 | /// <summary>
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233 | /// Reset while interpreter
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234 | /// </summary>
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235 | public void Reset() {
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236 | ExecCounter = 0;
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237 | IsAborted = false;
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238 | IsPaused = false;
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239 | currentTask = null;
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240 | currentProgram = null;
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241 |
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242 | Clear();
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243 | ConfigureStacks();
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244 | }
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245 |
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246 | private void ConfigureStacks() {
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247 | foreach (var pair in this.Stacks) {
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248 | pair.Value.IsEnabled = Configuration.IsStackEnabled(pair.Key);
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249 | }
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250 |
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251 | // exec stack must always be enabled
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252 | this.ExecStack.IsEnabled = true;
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253 | }
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254 |
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255 | /// <summary>
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256 | /// Clears Stacks and custom expressions
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257 | /// </summary>
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258 | public void Clear() {
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259 | foreach (var stack in Stacks)
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260 | stack.Value.Clear();
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261 |
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262 | CustomExpressions.Clear();
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263 | }
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264 |
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265 | [MethodImpl(MethodImplOptions.AggressiveInlining)]
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266 | private void Run() {
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267 | // if no stack which is modifies the exec stack is enabled, unroll loop due to performance reasons
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268 | if (!Configuration.IsStackEnabled(StackTypes.Exec)) {
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269 | while (CanRun(10))
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270 | DoTenSteps();
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271 | }
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272 |
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273 | while (IsRunning)
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274 | DoStep();
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275 |
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276 | if (IsCompleted)
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277 | Finally();
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278 | }
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279 |
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280 | [MethodImpl(MethodImplOptions.AggressiveInlining)]
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281 | private void Finally() {
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282 | if (Configuration.TopLevelPopCode && !CodeStack.IsEmpty && CodeStack.IsEnabled)
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283 | CodeStack.Pop();
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284 |
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285 | PoolContainer.DisposePools();
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286 | }
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287 |
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288 | private void InitRun(Expression expression) {
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289 | ExecStack.Push(expression);
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290 |
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291 | if (!expression.IsProgram)
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292 | return;
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293 |
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294 | DoStep();
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295 | ExecCounter--; // unpacking the initial program is not counted
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296 | }
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297 |
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298 | [MethodImpl(MethodImplOptions.AggressiveInlining)]
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299 | private bool DoStep() {
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300 | ExecCounter++;
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301 | return ExecStack.Pop().TryEval(this);
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302 | }
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303 |
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304 | [MethodImpl(MethodImplOptions.AggressiveInlining)]
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305 | private void DoTenSteps() {
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306 | ExecStack[0].TryEval(this);
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307 | ExecStack[1].TryEval(this);
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308 | ExecStack[2].TryEval(this);
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309 | ExecStack[3].TryEval(this);
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310 | ExecStack[4].TryEval(this);
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311 | ExecStack[5].TryEval(this);
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312 | ExecStack[6].TryEval(this);
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313 | ExecStack[7].TryEval(this);
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314 | ExecStack[8].TryEval(this);
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315 | ExecStack[9].TryEval(this);
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316 |
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317 | ExecStack.Remove(10);
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318 | ExecCounter += 10;
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319 | }
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320 |
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321 | private Task InterpretAsync() {
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322 | currentTask = Task.Run(() => Run());
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323 |
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324 | return currentTask;
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325 | }
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326 |
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327 | public virtual void Dispose() {
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328 | PoolContainer.DisposePools();
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329 | }
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330 | }
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331 | } |
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