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annotate doc/misc/buildnotes.html @ 13:43d8b194fb4e

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Remove unused variables.
author David A. Holland
date Tue, 31 May 2022 00:59:00 -0400
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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2 <HTML>
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3 <HEAD>
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4 <TITLE>AnaGram Build Notes</TITLE>
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5 </HEAD>
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6 <BODY
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7 BGCOLOR="#ffffff"
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8 BACKGROUND="html/tilbl6h.gif"
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9 TEXT="#000000"
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10 LINK="#0033CC"
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11 VLINK="#CC0033"
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12 ALINK="#CC0099"
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13 >
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14
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15 <P align=right>
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16 <IMG SRC=html/images/aga6d.gif ALT="AnaGram"><BR>
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17 A System for Syntax Directed Programming<BR>
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18 Version 2.40<BR>
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19 <BR>
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20 Copyright &copy; 1993-2002 Parsifal Software<BR>
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21 Copyright &copy; 2006, 2007 David A. Holland<BR>
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22 All Rights Reserved.
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23 </P>
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24
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25 <H1>Build/Release Notes</H1>
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26 <P>
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27 Version 2.40:
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28 <UL>
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29 <LI><A HREF=#24000>AnaGram 2.40.00</A>
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30 </UL>
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31 From version 2.01:
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32 <UL>
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33 <LI><A HREF=#20108>AnaGram 2.01.08</A>
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34 <LI><A HREF=#20107>AnaGram 2.01.07</A>
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35 <LI><A HREF=#20106>AnaGram 2.01.06</A>
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36 </UL>
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37 </P>
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38
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39 <A NAME="24000"></A>
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40 <H2>AnaGram 2.40.00 Build Notes</H2>
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41 <P>
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42 AnaGram 2.40.00 is the first release build of AnaGram 2.40, and the
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43 first open source release. See <A HREF=whatsnew.html>whatsnew.html</A>
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44 for details.
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45 </P>
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46
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47 <!-- ------------------------------------------------------------>
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48 <HR>
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49
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50 <A NAME="20108"></A>
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51 <H2>AnaGram 2.01.08 Build Notes</H2>
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52 AnaGram 2.01.08 is a maintenance build devoted primarily to bug fixes.
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53 <P>
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54 <H3>Warning Messages</H3>
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55 Use of a <I>void</I> token as a reduction procedure parameter is now properly
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56 diagnosed.
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57 <P>
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58 Some problems associated with identifying "circular definitions" were fixed.
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59 <P>
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60 <H3>Parsing Syntax Files</H3>
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61 There was a problem that would occasionally manifest itself as a spurious
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62 "unexpected end of file" if the last line of a syntax file contained a
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63 "//" comment. This problem has now been corrected.
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64 <P>
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65 Character set ranges defined by the form 'a'..'z' are now allowed.
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66 <P>
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67 Continuation lines in "wrapper" statements are now allowed.
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68 <P>
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69 An empty "virtual production", e.g., { }..., now causes a syntax error.
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70 <P>
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71
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72 <H3>Syntax Analysis</H3>
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73 A problem was corrected that sometimes caused incorrect partition set
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74 analysis when the "case sensitive" switch was turned off.
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75 <P>
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76 Any token that is used in the definition of a lexeme is now treated as
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77 a lexeme when it appears in any rule that is <I>not</I> part of the
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78 definition of a lexeme.
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79 <P>
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80 When <I>disregard white space</I> and <I>distinguish lexeme</I> statements
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81 are in effect, rules that are part of the definition of white space or of the
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82 definition of a lexeme are not reduced by keywords that are <I>not</I>
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83 themselves lexemes.
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84 <P>
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85 <H3>Code Generation</H3>
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86 Parser files with an automatically generated <I>main()</I> program now
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87 have a newline character at the end of file.
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88 <P>
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89 The use of template classes with more than one parameter, e.g.,<CODE>
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90 template &lt;class Foo, class Bar> class Foobar {...}</CODE> for token value
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91 types caused errors at compile time. When the type name was used as
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92 a parameter in a macro invocation, the comma embedded in angle
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93 brackets appeared to the macro preprocessor as an argument delimiter, thus
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94 causing it to see an incorrect number of arguments.
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95 <P>
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96 A subtle interaction between wrapper classes and immediate actions was
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97 fixed.
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98 <P>
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99 Some unnecessary <I>#include</I> statements were removed from the generated code.
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100 <P>
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101 If any token has type <I>double</I>, the parser stack alignment is now set to
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102 <I>double</I>.
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103 <P>
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104 The definition of the AgObjectWrapper template class is now protected from
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105 multiple definition by an <I>#ifndef</I> statement.
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106 <P>
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107 Incorrect keyword recognition tables were generated for grammars with
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108 256 or more keywords. They are now generated correctly, regardless of the
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109 number of keywords.
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110 <P>
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111 An error in the keyword recognition functions has been fixed. There was a
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112 possibility of unpredictable behavior in a grammar with both keywords and
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113 input codes greater than 255 decimal.
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114 <P>
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115 <H3>Miscellaneous Problems</H3>
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116 When the command line executable, <I>agcl</I>, was invoked without an
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117 explicit path, relying on the PATH environment variable, AnaGram was
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118 unable to find its support files. This has now been corrected.
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119 <P>
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120
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121 <!-- ------------------------------------------------------------>
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122 <HR>
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123
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124 <A NAME="20107"></A>
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125 <H2>2.01.07 Build Notes</H2>
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126 AnaGram 2.01.07 is a maintenance build which corrects a few minor bugs,
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127 modifies warning messages introduced in Build 2.01.06, and corrects a
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128 few help messages.
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129 <P>
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130 <H3>Corrected Error Token Handling</H3>
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131 Under certain circumstances, versions of AnaGram prior to the current
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132 version could generate instructions in the error token handling code which
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133 could cause bus errors. As far as we have been able to determine,
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134 actual instances of this problem have been rare. The problem has now
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135 been corrected.
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136 <P>
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137 <H3>Placement Delete Function</H3>
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138 C++ parsers that specified the wrapper option would get warnings from
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139 some compilers complaining about the absence of a "placement delete"
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140 operator for the wrapper classes. Conditional definition of "placement
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141 delete" operator has now been provided. Please see the on-line help
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142 for AG_PLACEMENT_DELETE_REQUIRED for details.
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143 <P>
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144 <H3>Modified Warning Messages</H3>
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145 The warning messages concerning grammars with "infinite recursion" and the
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146 possibility
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147 of consequent infinite loops in the generated parser have been changed
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148 to refer to "empty recursion" which we believe to be a more appropriate
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149 description of the problem.
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150
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151 <H3>Incorrect Warning</H3>
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152 Version 2.01.06 would issue a diagnostic for "infinite recursion" in
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153 certain cases of center recursion which were not, in fact, in error.
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154 The diagnosis is now more precise.
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155
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156 <H3>Warning instead of Error</H3>
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157
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158 "Empty recursion", formerly known as "infinite recursion", was handled as a
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159 grammar error in version 2.01.06, so that further analysis of a grammar with
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160 this problem was not possible. In version 2.01.07, empty recursion causes
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161 only a warning, so that analysis of the grammar may continue. Note that if
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162 you ignore the warning and actually build a parser incorporating empty
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163 recursion, the parser could go into an infinite loop during operation.
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164 <P>
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165 In the presence of empty
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166 recursion, AnaGram's Keyword Anomaly analysis and File Trace are disabled.
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167 This is because AnaGram could easily get into an infinite loop while
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168 attempting to parse sample input for a grammar incorporating empty
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169 recursion.
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170 <P>
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171
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172 <!-- ------------------------------------------------------------>
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173 <HR>
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174
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175 <A NAME="20106"></A>
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176 <H2>2.01.06 Build Notes</H2>
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177 AnaGram 2.01.06 is a maintenance build which corrects a few minor bugs
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178 and introduces two new error messages.
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179 <P>
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180
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181 <H3>Corrected "Wrapper" Feature Problems</H3>
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182 Under certain circumstances, in a grammar that used wrappers to encapsulate
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183 C++ class objects on the parser value stack, AnaGram would cause the wrapper
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184 for the first token in a rule to be deleted, even though the data was still
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185 needed. This bug was introduced in AnaGram 2.01.05 and has now been corrected.
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186 <P>
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187 If wrappers were enabled and <B>error token </B> resynchronization was also
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188 enabled, AnaGram generated incorrect code for deleting wrappers. This has been
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189 corrected.
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190
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191 <H3>New Error Messages</H3>
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192 It is possible, with null productions or other zero length tokens, to write
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193 recursive rules which translate into infinite loops in a parser. AnaGram now
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194 identifies such <B>infinitely recursive rules</B> and provides an error message
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195 for each such rule. AnaGram also terminates the analysis with an <B>infinite
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196 recursion</B> warning, since the analysis could also get into an infinite loop.
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197
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198 <H3>Thread Execution Priority</H3>
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199 AnaGram performs its analysis and build processes in separate background
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200 threads. The thread priority previously was set too low, so that thread
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201 execution could be delayed by power saving software running at the lowest
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202 priority level. The priority of the background thread was increased.
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203
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204 <H3>Short Reduction Procedures and the Reentrant Parser Switch</H3>
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205 Reduction procedures of the form<CODE> ={ return x;}</CODE> are now
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206 handled correctly even if both the <B>reentrant parser</B> switch and the
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207 <B>allow macros</B> switches are set. Previously there was a possibility of
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208 a compiler error when the parser module was compiled.
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209
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210 <H3>Default Value for Null Productions</H3>
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211 The default definition of the NULL_INITIALIZER macro was changed for parsers
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212 which have a simple integer value stack in order to avoid
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213 a compiler diagnostic generated by the Sun C++ 5.0 compiler.
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214 <P>
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215 </BODY>
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216 </HTML>