1 | // Errors.cs HDO, 2006-08-28
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2 | // ---------
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3 | // Error handling, storage of error messages and listing generation.
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4 | //=====================================|========================================
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5 |
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6 | #undef TEST_ERRORS
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7 |
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8 | using System;
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9 | using System.IO;
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10 |
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11 | public class Errors {
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12 |
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13 | public const String MODULENAME = "Errors";
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14 |
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15 | public static void ErrorsMethod(Utils.ModuleAction action, out String moduleName) {
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16 | //-----------------------------------|----------------------------------------
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17 | moduleName = MODULENAME;
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18 | switch (action) {
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19 | case Utils.ModuleAction.getModuleName:
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20 | return;
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21 | case Utils.ModuleAction.initModule:
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22 | aps = new AbortMethod[MAXABORTPROCS];
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23 | sp = 0;
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24 | PushAbortMethod(DefaultAbort);
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25 | stopParsing = null;
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26 | eowCnt = new int[4];
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27 | curEoW = new ErrorWarn[4];
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28 | break;
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29 | case Utils.ModuleAction.resetModule:
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30 | break;
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31 | case Utils.ModuleAction.cleanupModule:
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32 | eowl = null;
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33 | eowCnt = null;
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34 | curEoW = null;
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35 | return;
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36 | } // switch
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37 | // --- for initModule and resetModule ---
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38 | eowl = null;
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39 | numOfErrs = 0;
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40 | numOfWarns = 0;
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41 | for (int i = 0; i < 4; i++)
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42 | eowCnt[i] = 0;
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43 | } // ErrorsMethod
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44 |
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45 |
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46 | public const int MAXABORTPROCS = 3;
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47 | public const int MAXNUMOFERRS = 30; // sum of lex., syn. and sem. errors
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48 | public const int MAXNUMOFWARNS = 50;
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49 |
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50 | public delegate void StopParsingMethod();
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51 |
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52 | public delegate void AbortMethod(String abortKind, String moduleName,
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53 | String methodName, String descr);
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54 |
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55 | enum EoWKind {
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56 | lexErr,
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57 | synErr,
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58 | semErr,
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59 | warn
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60 | } // EoWKind
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61 |
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62 | public class ErrorWarnInfo {
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63 | public String msg;
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64 | public int line, col;
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65 | } // ErrorWarnInfo
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66 |
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67 | private class ErrorWarn {
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68 | public EoWKind kind;
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69 | public ErrorWarnInfo info;
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70 | public ErrorWarn next;
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71 | } // ErrorWarn
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72 |
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73 | private static AbortMethod[] aps; // abort method stack
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74 | private static int sp; // stack pointer for aps
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75 | private static StopParsingMethod stopParsing;
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76 |
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77 | // --- errors and/or warnings handling ---
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78 |
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79 | private static ErrorWarn eowl; // sorted list of errors or warnings
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80 | private static int numOfErrs, numOfWarns;
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81 | private static int[] eowCnt;
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82 |
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83 | private static void DefaultAbort(String abortKind, String moduleName,
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84 | String funcName, String descr) {
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85 | Console.WriteLine();
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86 | Console.WriteLine("*** {0} in module {1} function {2}",
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87 | abortKind, moduleName, funcName);
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88 | Console.WriteLine("*** {0}", descr);
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89 | Utils.Modules(Utils.ModuleAction.cleanupModule);
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90 | Environment.Exit(Utils.EXIT_FAILURE);
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91 | } // DefaultAbort
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92 |
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93 |
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94 | // --- install stop parsing and abort functions ---
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95 |
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96 | public static void InstallStopParsingMethod(StopParsingMethod spp) {
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97 | //-----------------------------------|----------------------------------------
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98 | stopParsing = spp;
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99 | } // InstallStopParsingMethod
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100 |
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101 | public static void PushAbortMethod(AbortMethod ap) {
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102 | //-----------------------------------|----------------------------------------
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103 | if (sp == MAXABORTPROCS)
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104 | Restriction(MODULENAME, "PushAbortFunc", "too many abort functions");
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105 | aps[sp++] = ap;
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106 | } // PushAbortMethod
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107 |
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108 |
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109 | // --- report error or restriction and call abort functions ---
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110 |
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111 | public static void CompilerError(String moduleName, String funcName,
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112 | String fmt, params Object[] p) {
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113 | //-----------------------------------|----------------------------------------
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114 | TextWriter w = new StringWriter();
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115 | w.WriteLine(fmt, p);
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116 | String msg = w.ToString();
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117 | for (int i = sp - 1; i >= 0; i--)
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118 | aps[i]("compiler error", moduleName, funcName, msg); // should not return*
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119 | DefaultAbort("compiler error", moduleName, funcName, msg);
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120 | } // CompilerError
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121 |
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122 | public static void Restriction(String moduleName, String funcName,
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123 | String fmt, params Object[] p) {
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124 | //-----------------------------------|----------------------------------------
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125 | TextWriter w = new StringWriter();
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126 | w.WriteLine(fmt, p);
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127 | String msg = w.ToString();
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128 | for (int i = sp - 1; i >= 0; i--)
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129 | aps[i]("restriction", moduleName, funcName, msg); // should not return
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130 | DefaultAbort("restriction", moduleName, funcName, msg);
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131 | } // Restriction
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132 |
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133 | public static void CallStopParsing() {
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134 | //-----------------------------------|----------------------------------------
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135 | if (stopParsing != null)
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136 | stopParsing();
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137 | } // CallStopParsing
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138 |
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139 |
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140 | // --- storage of errors found on compilation ---
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141 |
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142 | private static void EnterMessage(EoWKind knd, int line, int col, String msg) {
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143 | ErrorWarn eow, prveow, nxteow;
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144 | eowCnt[(int)knd]++;
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145 | eow = new ErrorWarn();
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146 | eow.kind = knd;
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147 | eow.info = new ErrorWarnInfo();
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148 | eow.info.line = line;
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149 | eow.info.col = col;
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150 | eow.info.msg = msg;
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151 | prveow = null;
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152 | nxteow = eowl;
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153 | while (nxteow != null && nxteow.info.line <= line) {
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154 | prveow = nxteow;
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155 | nxteow = nxteow.next;
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156 | } // while
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157 | while (nxteow != null && nxteow.info.line == line && nxteow.info.col <= col) {
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158 | prveow = nxteow;
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159 | nxteow = nxteow.next;
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160 | } // while
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161 | if (prveow == null)
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162 | eowl = eow;
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163 | else
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164 | prveow.next = eow;
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165 | eow.next = nxteow;
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166 | } // EnterMessage
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167 |
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168 | private static void CheckForLimits(EoWKind knd, int line, int col) {
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169 | if (knd == EoWKind.lexErr || knd == EoWKind.synErr || knd == EoWKind.semErr) {
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170 | numOfErrs++;
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171 | if (numOfErrs == MAXNUMOFERRS) {
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172 | Warning(line, col, "too many errors, parsing stopped");
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173 | CallStopParsing();
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174 | } // if
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175 | } else { // knd == EoWKind.warn
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176 | numOfWarns++;
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177 | if (numOfWarns == MAXNUMOFWARNS) {
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178 | Warning(line, col, "too many warnings, parsing stopped");
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179 | CallStopParsing();
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180 | } // if
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181 | } // else
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182 | } // CheckForLimits
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183 |
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184 |
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185 | public static void LexError(int line, int col, String fmt, params Object[] p) {
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186 | //-----------------------------------|----------------------------------------
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187 | if (numOfErrs == MAXNUMOFERRS)
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188 | return;
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189 | TextWriter w = new StringWriter();
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190 | w.WriteLine(fmt, p);
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191 | String msg = w.ToString();
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192 | EnterMessage(EoWKind.lexErr, line, col, msg);
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193 | CheckForLimits(EoWKind.lexErr, line, col);
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194 | } // SynError
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195 |
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196 | public static void SynError(int line, int col, String fmt, params Object[] p) {
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197 | //-----------------------------------|----------------------------------------
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198 | if (numOfErrs == MAXNUMOFERRS)
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199 | return;
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200 | TextWriter w = new StringWriter();
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201 | w.WriteLine(fmt, p);
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202 | String msg = w.ToString();
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203 | EnterMessage(EoWKind.synErr, line, col, msg);
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204 | CheckForLimits(EoWKind.synErr, line, col);
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205 | } // SynError
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206 |
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207 | public static void SemError(int line, int col, String fmt, params Object[] p) {
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208 | //-----------------------------------|----------------------------------------
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209 | if (numOfErrs == MAXNUMOFERRS)
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210 | return;
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211 | TextWriter w = new StringWriter();
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212 | w.WriteLine(fmt, p);
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213 | String msg = w.ToString();
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214 | EnterMessage(EoWKind.semErr, line, col, msg);
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215 | CheckForLimits(EoWKind.semErr, line, col);
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216 | } // SemError
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217 |
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218 | public static void Warning(int line, int col, String fmt, params Object[] p) {
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219 | //-----------------------------------|----------------------------------------
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220 | if (numOfWarns == MAXNUMOFWARNS)
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221 | return;
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222 | TextWriter w = new StringWriter();
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223 | w.WriteLine(fmt, p);
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224 | String msg = w.ToString();
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225 | EnterMessage(EoWKind.warn, line, col, msg);
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226 | CheckForLimits(EoWKind.warn, line, col);
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227 | } // Warning
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228 |
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229 |
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230 | // --- retrieval of stored source errors and warnings ---
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231 |
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232 | public static int NumOfErrors() {
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233 | //-----------------------------------|----------------------------------------
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234 | return numOfErrs;
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235 | } // NumOfErrors
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236 |
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237 | public static int NumOfLexErrors() {
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238 | //-----------------------------------|----------------------------------------
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239 | return eowCnt[(int)EoWKind.lexErr];
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240 | } // NumOfLexErrors
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241 |
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242 | public static int NumOfSynErrors() {
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243 | //-----------------------------------|----------------------------------------
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244 | return eowCnt[(int)EoWKind.synErr];
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245 | } // NumOfSynErrors
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246 |
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247 | public static int NumOfSemErrors() {
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248 | //-----------------------------------|----------------------------------------
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249 | return eowCnt[(int)EoWKind.semErr];
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250 | } // NumOfSemErrors
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251 |
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252 | public static int NumOfWarnings() {
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253 | //-----------------------------------|----------------------------------------
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254 | return eowCnt[(int)EoWKind.warn];
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255 | } // NumOfWarnings
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256 |
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257 |
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258 | private static ErrorWarn[] curEoW;
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259 |
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260 | private static ErrorWarnInfo GetMessage(bool first, EoWKind knd) {
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261 | ErrorWarn eow = null;
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262 | ErrorWarnInfo eowi = null;
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263 | if (first)
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264 | eow = eowl;
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265 | else
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266 | eow = curEoW[(int)knd].next;
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267 | while (eow != null && eow.kind != knd)
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268 | eow = eow.next;
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269 | curEoW[(int)knd] = eow;
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270 | if (eow == null) {
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271 | eowi = new ErrorWarnInfo();
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272 | eowi.msg = "";
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273 | eowi.line = 0;
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274 | eowi.col = 0;
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275 | } else
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276 | eowi = eow.info;
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277 | return eowi;
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278 | } // GetMessage
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279 |
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280 | public static ErrorWarnInfo GetLexError(bool first) {
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281 | //-----------------------------------|----------------------------------------
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282 | return GetMessage(first, EoWKind.lexErr);
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283 | } // ErrorWarnInfo
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284 |
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285 | public static ErrorWarnInfo GetSynError(bool first) {
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286 | //-----------------------------------|----------------------------------------
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287 | return GetMessage(first, EoWKind.synErr);
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288 | } // ErrorWarnInfo
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289 |
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290 | public static ErrorWarnInfo GetSemError(bool first) {
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291 | //-----------------------------------|----------------------------------------
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292 | return GetMessage(first, EoWKind.semErr);
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293 | } // ErrorWarnInfo
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294 |
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295 | public static ErrorWarnInfo GetWarning(bool first) {
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296 | //-----------------------------------|----------------------------------------
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297 | return GetMessage(first, EoWKind.warn);
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298 | } // ErrorWarnInfo
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299 |
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300 |
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301 | // --- listing generation ---
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302 |
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303 | private static void PutMsg(TextWriter lst, ErrorWarn eow) {
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304 | switch (eow.kind) {
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305 | case EoWKind.lexErr:
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306 | lst.Write("+LEX+");
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307 | break;
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308 | case EoWKind.synErr:
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309 | lst.Write("*SYN*");
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310 | break;
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311 | case EoWKind.semErr:
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312 | lst.Write("#SEM#");
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313 | break;
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314 | case EoWKind.warn:
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315 | lst.Write("!WRN!");
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316 | break;
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317 | } // switch
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318 | for (int i = 0; i < eow.info.col; i++)
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319 | lst.Write(" ");
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320 | lst.Write(" ^{0}", eow.info.msg);
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321 | } // PutMsg
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322 |
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323 | public enum ListingShape {
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324 | longListing,
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325 | shortListing
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326 | } // ListingShape
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327 |
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328 | public static void GenerateListing(TextReader src, TextWriter lst,
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329 | ListingShape listShape) {
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330 | //-----------------------------------|----------------------------------------
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331 | ErrorWarn eow = null;
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332 | int lnr, skip;
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333 | String srcLine;
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334 |
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335 | ((StreamReader)src).BaseStream.Seek(0, SeekOrigin.Begin);
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336 |
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337 | eow = eowl;
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338 | if (eow != null) {
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339 | while (eow != null && eow.info.line < 1) {
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340 | PutMsg(lst, eow);
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341 | eow = eow.next;
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342 | } // while
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343 | lst.WriteLine();
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344 | } // if
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345 | lnr = 1;
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346 | for (; ; ) {
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347 | if (listShape == ListingShape.shortListing) {
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348 | if (eow == null) {
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349 | lst.WriteLine("...");
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350 | break;
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351 | } // if
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352 | skip = eow.info.line - lnr;
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353 | if (skip > 0) {
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354 | lst.WriteLine("...");
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355 | lnr = eow.info.line;
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356 | while (skip-- > 0) {
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357 | srcLine = src.ReadLine();
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358 | if (srcLine == null)
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359 | break;
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360 | } // while
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361 | } // if
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362 | } // if
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363 | srcLine = src.ReadLine();
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364 | if (srcLine == null)
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365 | break;
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366 | lst.WriteLine("{0,5}| {1}", lnr, srcLine);
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367 | while (eow != null && eow.info.line == lnr) {
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368 | PutMsg(lst, eow);
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369 | eow = eow.next;
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370 | } // while
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371 | lnr++;
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372 | } // for
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373 | lst.WriteLine();
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374 | while (eow != null) {
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375 | PutMsg(lst, eow);
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376 | eow = eow.next;
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377 | } // while
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378 | lst.WriteLine();
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379 | lst.WriteLine("error(s) and warning(s):");
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380 | lst.WriteLine("-----------------------");
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381 | lst.WriteLine();
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382 | lst.WriteLine("{0,5} lexical error(s) ", NumOfLexErrors());
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383 | lst.WriteLine("{0,5} syntax error(s) ", NumOfSynErrors());
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384 | lst.WriteLine("{0,5} semantic error(s)", NumOfSemErrors());
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385 | lst.WriteLine("{0,5} warning(s) ", NumOfWarnings());
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386 | } // GenerateListing
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387 |
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388 |
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389 | #if TEST_ERRORS
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390 |
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391 | public static void Main(String[] args) {
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392 | Console.WriteLine("START: Errors");
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393 |
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394 | Console.WriteLine("installing ...");
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395 | Utils.InstallModule("Utils", new Utils.ModuleMethodDelegate(Utils.UtilsMethod));
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396 | Utils.InstallModule("Sets", new Utils.ModuleMethodDelegate(Sets.SetsMethod ));
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397 | Utils.InstallModule("Errors", new Utils.ModuleMethodDelegate(Errors.ErrorsMethod));
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398 | Console.WriteLine("initModule ...");
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399 | Utils.Modules(Utils.ModuleAction.initModule);
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400 |
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401 | LexError(1, 1, "LexError at {0}, {1}", 1, 1);
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402 | SynError(3, 10, "SynError at {0}, {1}", 2, 10);
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403 | SemError(5, 5, "SemError at {0}, {1}", 5, 5);
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404 | Warning(0, 0, "Warning at {0}, {1}", 0, 0);
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405 | Warning(9, 0, "Warning at {0}, {1}", 9, 0);
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406 |
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407 | String srcName;
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408 | Utils.GetInputFileName("source file name > ", out srcName);
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409 | FileStream srcFs = new FileStream(srcName, FileMode.Open);
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410 | StreamReader src = new StreamReader(srcFs);
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411 | FileStream lstFs = new FileStream(srcName + ".lst", FileMode.Create);
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412 | StreamWriter lst = new StreamWriter(lstFs);
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413 |
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414 | lst.WriteLine("START");
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415 | GenerateListing(src, lst, ListingShape.longListing);
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416 | lst.WriteLine("END");
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417 |
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418 | src.Close();
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419 | lst.Close();
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420 |
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421 | Console.WriteLine("resetModule ...");
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422 | Utils.Modules(Utils.ModuleAction.resetModule);
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423 |
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424 | Console.WriteLine("cleanupModule ...");
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425 | Utils.Modules(Utils.ModuleAction.cleanupModule);
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426 | Console.WriteLine("END");
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427 | // Console.WriteLine("type [CR] to continue ...");
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428 | // Console.ReadLine();
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429 | } // Main
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430 |
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431 | #endif
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432 |
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433 | } // Errors
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434 |
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435 | // End of Errors.cs
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436 | //=====================================|========================================
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437 |
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