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annotate docs/TableGen/LangRef.rst @ 87:ff9ec87918d4

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move ParseCbCGotoStatement() to ParseCbC.cpp
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 13 Apr 2015 15:18:58 +0900
parents 54457678186b
children afa8332a0e37
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1 ===========================
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2 TableGen Language Reference
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3 ===========================
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4
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5 .. contents::
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6 :local:
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7
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8 .. warning::
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9 This document is extremely rough. If you find something lacking, please
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10 fix it, file a documentation bug, or ask about it on llvmdev.
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11
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12 Introduction
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13 ============
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14
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15 This document is meant to be a normative spec about the TableGen language
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16 in and of itself (i.e. how to understand a given construct in terms of how
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17 it affects the final set of records represented by the TableGen file). If
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18 you are unsure if this document is really what you are looking for, please
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19 read the :doc:`introduction to TableGen <index>` first.
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20
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21 Notation
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22 ========
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23
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24 The lexical and syntax notation used here is intended to imitate
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25 `Python's`_. In particular, for lexical definitions, the productions
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26 operate at the character level and there is no implied whitespace between
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27 elements. The syntax definitions operate at the token level, so there is
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28 implied whitespace between tokens.
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29
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30 .. _`Python's`: http://docs.python.org/py3k/reference/introduction.html#notation
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31
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32 Lexical Analysis
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33 ================
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34
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35 TableGen supports BCPL (``// ...``) and nestable C-style (``/* ... */``)
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36 comments.
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37
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38 The following is a listing of the basic punctuation tokens::
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39
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40 - + [ ] { } ( ) < > : ; . = ? #
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41
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42 Numeric literals take one of the following forms:
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43
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44 .. TableGen actually will lex some pretty strange sequences an interpret
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45 them as numbers. What is shown here is an attempt to approximate what it
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46 "should" accept.
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47
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48 .. productionlist::
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49 TokInteger: `DecimalInteger` | `HexInteger` | `BinInteger`
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50 DecimalInteger: ["+" | "-"] ("0"..."9")+
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51 HexInteger: "0x" ("0"..."9" | "a"..."f" | "A"..."F")+
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52 BinInteger: "0b" ("0" | "1")+
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53
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54 One aspect to note is that the :token:`DecimalInteger` token *includes* the
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55 ``+`` or ``-``, as opposed to having ``+`` and ``-`` be unary operators as
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56 most languages do.
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57
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58 Also note that :token:`BinInteger` creates a value of type ``bits<n>``
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59 (where ``n`` is the number of bits). This will implicitly convert to
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60 integers when needed.
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61
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62 TableGen has identifier-like tokens:
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63
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64 .. productionlist::
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65 ualpha: "a"..."z" | "A"..."Z" | "_"
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66 TokIdentifier: ("0"..."9")* `ualpha` (`ualpha` | "0"..."9")*
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67 TokVarName: "$" `ualpha` (`ualpha` | "0"..."9")*
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68
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69 Note that unlike most languages, TableGen allows :token:`TokIdentifier` to
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70 begin with a number. In case of ambiguity, a token will be interpreted as a
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71 numeric literal rather than an identifier.
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72
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73 TableGen also has two string-like literals:
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74
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75 .. productionlist::
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76 TokString: '"' <non-'"' characters and C-like escapes> '"'
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77 TokCodeFragment: "[{" <shortest text not containing "}]"> "}]"
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78
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79 :token:`TokCodeFragment` is essentially a multiline string literal
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80 delimited by ``[{`` and ``}]``.
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81
0
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82 .. note::
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83 The current implementation accepts the following C-like escapes::
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84
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85 \\ \' \" \t \n
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86
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87 TableGen also has the following keywords::
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88
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89 bit bits class code dag
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90 def foreach defm field in
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91 int let list multiclass string
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92
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93 TableGen also has "bang operators" which have a
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94 wide variety of meanings:
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95
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96 .. productionlist::
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97 BangOperator: one of
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98 :!eq !if !head !tail !con
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99 :!add !shl !sra !srl !and
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100 :!cast !empty !subst !foreach !listconcat !strconcat
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101
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102 Syntax
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103 ======
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104
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105 TableGen has an ``include`` mechanism. It does not play a role in the
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106 syntax per se, since it is lexically replaced with the contents of the
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107 included file.
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108
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109 .. productionlist::
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110 IncludeDirective: "include" `TokString`
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111
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112 TableGen's top-level production consists of "objects".
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113
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114 .. productionlist::
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115 TableGenFile: `Object`*
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116 Object: `Class` | `Def` | `Defm` | `Let` | `MultiClass` | `Foreach`
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117
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118 ``class``\es
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119 ------------
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120
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121 .. productionlist::
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122 Class: "class" `TokIdentifier` [`TemplateArgList`] `ObjectBody`
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123
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124 A ``class`` declaration creates a record which other records can inherit
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125 from. A class can be parametrized by a list of "template arguments", whose
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126 values can be used in the class body.
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127
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128 A given class can only be defined once. A ``class`` declaration is
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129 considered to define the class if any of the following is true:
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130
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131 .. break ObjectBody into its consituents so that they are present here?
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132
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133 #. The :token:`TemplateArgList` is present.
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134 #. The :token:`Body` in the :token:`ObjectBody` is present and is not empty.
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135 #. The :token:`BaseClassList` in the :token:`ObjectBody` is present.
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136
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137 You can declare an empty class by giving and empty :token:`TemplateArgList`
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138 and an empty :token:`ObjectBody`. This can serve as a restricted form of
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139 forward declaration: note that records deriving from the forward-declared
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140 class will inherit no fields from it since the record expansion is done
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141 when the record is parsed.
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142
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143 .. productionlist::
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144 TemplateArgList: "<" `Declaration` ("," `Declaration`)* ">"
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145
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146 Declarations
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147 ------------
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148
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149 .. Omitting mention of arcane "field" prefix to discourage its use.
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150
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151 The declaration syntax is pretty much what you would expect as a C++
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152 programmer.
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153
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154 .. productionlist::
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155 Declaration: `Type` `TokIdentifier` ["=" `Value`]
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156
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157 It assigns the value to the identifer.
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158
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159 Types
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160 -----
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161
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162 .. productionlist::
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163 Type: "string" | "code" | "bit" | "int" | "dag"
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164 :| "bits" "<" `TokInteger` ">"
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165 :| "list" "<" `Type` ">"
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166 :| `ClassID`
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167 ClassID: `TokIdentifier`
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168
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169 Both ``string`` and ``code`` correspond to the string type; the difference
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170 is purely to indicate programmer intention.
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171
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172 The :token:`ClassID` must identify a class that has been previously
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173 declared or defined.
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174
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175 Values
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176 ------
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177
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178 .. productionlist::
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179 Value: `SimpleValue` `ValueSuffix`*
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180 ValueSuffix: "{" `RangeList` "}"
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181 :| "[" `RangeList` "]"
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182 :| "." `TokIdentifier`
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183 RangeList: `RangePiece` ("," `RangePiece`)*
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184 RangePiece: `TokInteger`
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185 :| `TokInteger` "-" `TokInteger`
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186 :| `TokInteger` `TokInteger`
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187
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188 The peculiar last form of :token:`RangePiece` is due to the fact that the
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189 "``-``" is included in the :token:`TokInteger`, hence ``1-5`` gets lexed as
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parents:
diff changeset
190 two consecutive :token:`TokInteger`'s, with values ``1`` and ``-5``,
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diff changeset
191 instead of "1", "-", and "5".
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192 The :token:`RangeList` can be thought of as specifying "list slice" in some
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193 contexts.
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194
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195
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196 :token:`SimpleValue` has a number of forms:
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197
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198
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199 .. productionlist::
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200 SimpleValue: `TokIdentifier`
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201
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202 The value will be the variable referenced by the identifier. It can be one
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diff changeset
203 of:
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204
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205 .. The code for this is exceptionally abstruse. These examples are a
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diff changeset
206 best-effort attempt.
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diff changeset
207
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208 * name of a ``def``, such as the use of ``Bar`` in::
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diff changeset
209
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210 def Bar : SomeClass {
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211 int X = 5;
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212 }
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213
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diff changeset
214 def Foo {
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diff changeset
215 SomeClass Baz = Bar;
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216 }
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diff changeset
217
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218 * value local to a ``def``, such as the use of ``Bar`` in::
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diff changeset
219
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diff changeset
220 def Foo {
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diff changeset
221 int Bar = 5;
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diff changeset
222 int Baz = Bar;
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223 }
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diff changeset
224
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225 * a template arg of a ``class``, such as the use of ``Bar`` in::
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diff changeset
226
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diff changeset
227 class Foo<int Bar> {
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diff changeset
228 int Baz = Bar;
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229 }
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diff changeset
230
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diff changeset
231 * value local to a ``multiclass``, such as the use of ``Bar`` in::
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diff changeset
232
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diff changeset
233 multiclass Foo {
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diff changeset
234 int Bar = 5;
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diff changeset
235 int Baz = Bar;
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diff changeset
236 }
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diff changeset
237
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238 * a template arg to a ``multiclass``, such as the use of ``Bar`` in::
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parents:
diff changeset
239
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diff changeset
240 multiclass Foo<int Bar> {
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diff changeset
241 int Baz = Bar;
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242 }
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diff changeset
243
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244 .. productionlist::
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diff changeset
245 SimpleValue: `TokInteger`
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diff changeset
246
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247 This represents the numeric value of the integer.
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248
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249 .. productionlist::
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diff changeset
250 SimpleValue: `TokString`+
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parents:
diff changeset
251
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diff changeset
252 Multiple adjacent string literals are concatenated like in C/C++. The value
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diff changeset
253 is the concatenation of the strings.
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diff changeset
254
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255 .. productionlist::
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diff changeset
256 SimpleValue: `TokCodeFragment`
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diff changeset
257
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diff changeset
258 The value is the string value of the code fragment.
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diff changeset
259
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260 .. productionlist::
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parents:
diff changeset
261 SimpleValue: "?"
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diff changeset
262
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diff changeset
263 ``?`` represents an "unset" initializer.
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diff changeset
264
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diff changeset
265 .. productionlist::
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diff changeset
266 SimpleValue: "{" `ValueList` "}"
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parents:
diff changeset
267 ValueList: [`ValueListNE`]
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parents:
diff changeset
268 ValueListNE: `Value` ("," `Value`)*
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parents:
diff changeset
269
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parents:
diff changeset
270 This represents a sequence of bits, as would be used to initialize a
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
271 ``bits<n>`` field (where ``n`` is the number of bits).
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parents:
diff changeset
272
95c75e76d11b LLVM 3.4
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parents:
diff changeset
273 .. productionlist::
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parents:
diff changeset
274 SimpleValue: `ClassID` "<" `ValueListNE` ">"
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parents:
diff changeset
275
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parents:
diff changeset
276 This generates a new anonymous record definition (as would be created by an
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parents:
diff changeset
277 unnamed ``def`` inheriting from the given class with the given template
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
278 arguments) and the value is the value of that record definition.
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parents:
diff changeset
279
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parents:
diff changeset
280 .. productionlist::
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parents:
diff changeset
281 SimpleValue: "[" `ValueList` "]" ["<" `Type` ">"]
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parents:
diff changeset
282
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parents:
diff changeset
283 A list initializer. The optional :token:`Type` can be used to indicate a
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
284 specific element type, otherwise the element type will be deduced from the
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
285 given values.
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parents:
diff changeset
286
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
287 .. The initial `DagArg` of the dag must start with an identifier or
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
288 !cast, but this is more of an implementation detail and so for now just
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
289 leave it out.
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parents:
diff changeset
290
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parents:
diff changeset
291 .. productionlist::
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
292 SimpleValue: "(" `DagArg` `DagArgList` ")"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
293 DagArgList: `DagArg` ("," `DagArg`)*
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parents:
diff changeset
294 DagArg: `Value` [":" `TokVarName`] | `TokVarName`
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parents:
diff changeset
295
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parents:
diff changeset
296 The initial :token:`DagArg` is called the "operator" of the dag.
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parents:
diff changeset
297
95c75e76d11b LLVM 3.4
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parents:
diff changeset
298 .. productionlist::
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
299 SimpleValue: `BangOperator` ["<" `Type` ">"] "(" `ValueListNE` ")"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
300
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
301 Bodies
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
302 ------
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
303
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
304 .. productionlist::
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
305 ObjectBody: `BaseClassList` `Body`
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
306 BaseClassList: [":" `BaseClassListNE`]
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
307 BaseClassListNE: `SubClassRef` ("," `SubClassRef`)*
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
308 SubClassRef: (`ClassID` | `MultiClassID`) ["<" `ValueList` ">"]
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
309 DefmID: `TokIdentifier`
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
310
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
311 The version with the :token:`MultiClassID` is only valid in the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
312 :token:`BaseClassList` of a ``defm``.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
313 The :token:`MultiClassID` should be the name of a ``multiclass``.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
314
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
315 .. put this somewhere else
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
316
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
317 It is after parsing the base class list that the "let stack" is applied.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
318
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
319 .. productionlist::
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
320 Body: ";" | "{" BodyList "}"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
321 BodyList: BodyItem*
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
322 BodyItem: `Declaration` ";"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
323 :| "let" `TokIdentifier` [`RangeList`] "=" `Value` ";"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
324
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
325 The ``let`` form allows overriding the value of an inherited field.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
326
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
327 ``def``
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
328 -------
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
329
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
330 .. TODO::
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
331 There can be pastes in the names here, like ``#NAME#``. Look into that
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
332 and document it (it boils down to ParseIDValue with IDParseMode ==
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
333 ParseNameMode). ParseObjectName calls into the general ParseValue, with
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
334 the only different from "arbitrary expression parsing" being IDParseMode
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
335 == Mode.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
336
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
337 .. productionlist::
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
338 Def: "def" `TokIdentifier` `ObjectBody`
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
339
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
340 Defines a record whose name is given by the :token:`TokIdentifier`. The
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
341 fields of the record are inherited from the base classes and defined in the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
342 body.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
343
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
344 Special handling occurs if this ``def`` appears inside a ``multiclass`` or
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
345 a ``foreach``.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
346
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
347 ``defm``
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
348 --------
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
349
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
350 .. productionlist::
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
351 Defm: "defm" `TokIdentifier` ":" `BaseClassListNE` ";"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
352
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
353 Note that in the :token:`BaseClassList`, all of the ``multiclass``'s must
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
354 precede any ``class``'s that appear.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
355
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
356 ``foreach``
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
357 -----------
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
358
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
359 .. productionlist::
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
360 Foreach: "foreach" `Declaration` "in" "{" `Object`* "}"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
361 :| "foreach" `Declaration` "in" `Object`
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
362
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
363 The value assigned to the variable in the declaration is iterated over and
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
364 the object or object list is reevaluated with the variable set at each
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
365 iterated value.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
366
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
367 Top-Level ``let``
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
368 -----------------
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
369
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
370 .. productionlist::
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
371 Let: "let" `LetList` "in" "{" `Object`* "}"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
372 :| "let" `LetList` "in" `Object`
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
373 LetList: `LetItem` ("," `LetItem`)*
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
374 LetItem: `TokIdentifier` [`RangeList`] "=" `Value`
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
375
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
376 This is effectively equivalent to ``let`` inside the body of a record
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
377 except that it applies to multiple records at a time. The bindings are
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
378 applied at the end of parsing the base classes of a record.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
379
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
380 ``multiclass``
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
381 --------------
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
382
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
383 .. productionlist::
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
384 MultiClass: "multiclass" `TokIdentifier` [`TemplateArgList`]
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
385 : [":" `BaseMultiClassList`] "{" `MultiClassObject`+ "}"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
386 BaseMultiClassList: `MultiClassID` ("," `MultiClassID`)*
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
387 MultiClassID: `TokIdentifier`
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
388 MultiClassObject: `Def` | `Defm` | `Let` | `Foreach`