HCoop / hcoop / debian / mlton.git / blame
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1 | <!DOCTYPE html>\r |
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| 3 | <head>\r | |
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| 5 | <meta name="generator" content="AsciiDoc 8.6.9">\r | |
| 6 | <title>LambdaFree</title>\r | |
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| 18 | </head>\r | |
| 19 | <body class="article">\r | |
| 20 | <div id="banner">\r | |
| 21 | <div id="banner-home">\r | |
| 22 | <a href="./Home">MLton 20180207</a>\r | |
| 23 | </div>\r | |
| 24 | </div>\r | |
| 25 | <div id="header">\r | |
| 26 | <h1>LambdaFree</h1>\r | |
| 27 | </div>\r | |
| 28 | <div id="content">\r | |
| 29 | <div id="preamble">\r | |
| 30 | <div class="sectionbody">\r | |
| 31 | <div class="paragraph"><p><a href="LambdaFree">LambdaFree</a> is an analysis pass for the <a href="SXML">SXML</a>\r | |
| 32 | <a href="IntermediateLanguage">IntermediateLanguage</a>, invoked from <a href="ClosureConvert">ClosureConvert</a>.</p></div>\r | |
| 33 | </div>\r | |
| 34 | </div>\r | |
| 35 | <div class="sect1">\r | |
| 36 | <h2 id="_description">Description</h2>\r | |
| 37 | <div class="sectionbody">\r | |
| 38 | <div class="paragraph"><p>This pass descends the entire <a href="SXML">SXML</a> program and attaches a property\r | |
| 39 | to each <span class="monospaced">Lambda</span> <span class="monospaced">PrimExp.t</span> in the program. Then, you can use\r | |
| 40 | <span class="monospaced">lambdaFree</span> and <span class="monospaced">lambdaRec</span> to get free variables of that <span class="monospaced">Lambda</span>.</p></div>\r | |
| 41 | </div>\r | |
| 42 | </div>\r | |
| 43 | <div class="sect1">\r | |
| 44 | <h2 id="_implementation">Implementation</h2>\r | |
| 45 | <div class="sectionbody">\r | |
| 46 | <div class="ulist"><ul>\r | |
| 47 | <li>\r | |
| 48 | <p>\r | |
| 49 | <a href="https://github.com/MLton/mlton/blob/master/mlton/closure-convert/lambda-free.sig"><span class="monospaced">lambda-free.sig</span></a>\r | |
| 50 | </p>\r | |
| 51 | </li>\r | |
| 52 | <li>\r | |
| 53 | <p>\r | |
| 54 | <a href="https://github.com/MLton/mlton/blob/master/mlton/closure-convert/lambda-free.fun"><span class="monospaced">lambda-free.fun</span></a>\r | |
| 55 | </p>\r | |
| 56 | </li>\r | |
| 57 | </ul></div>\r | |
| 58 | </div>\r | |
| 59 | </div>\r | |
| 60 | <div class="sect1">\r | |
| 61 | <h2 id="_details_and_notes">Details and Notes</h2>\r | |
| 62 | <div class="sectionbody">\r | |
| 63 | <div class="paragraph"><p>For <span class="monospaced">Lambda</span>-s bound in a <span class="monospaced">Fun</span> dec, <span class="monospaced">lambdaFree</span> gives the union of\r | |
| 64 | the frees of the entire group of mutually recursive functions. Hence,\r | |
| 65 | <span class="monospaced">lambdaFree</span> for every <span class="monospaced">Lambda</span> in a single <span class="monospaced">Fun</span> dec is the same.\r | |
| 66 | Furthermore, for a <span class="monospaced">Lambda</span> bound in a <span class="monospaced">Fun</span> dec, <span class="monospaced">lambdaRec</span> gives\r | |
| 67 | the list of other functions bound in the same dec defining that\r | |
| 68 | <span class="monospaced">Lambda</span>.</p></div>\r | |
| 69 | <div class="paragraph"><p>For example:</p></div>\r | |
| 70 | <div class="listingblock">\r | |
| 71 | <div class="content monospaced">\r | |
| 72 | <pre>val rec f = fn x => ... y ... g ... f ...\r | |
| 73 | and g = fn z => ... f ... w ...</pre>\r | |
| 74 | </div></div>\r | |
| 75 | <div class="listingblock">\r | |
| 76 | <div class="content monospaced">\r | |
| 77 | <pre>lambdaFree(fn x =>) = [y, w]\r | |
| 78 | lambdaFree(fn z =>) = [y, w]\r | |
| 79 | lambdaRec(fn x =>) = [g, f]\r | |
| 80 | lambdaRec(fn z =>) = [f]</pre>\r | |
| 81 | </div></div>\r | |
| 82 | </div>\r | |
| 83 | </div>\r | |
| 84 | </div>\r | |
| 85 | <div id="footnotes"><hr></div>\r | |
| 86 | <div id="footer">\r | |
| 87 | <div id="footer-text">\r | |
| 88 | </div>\r | |
| 89 | <div id="footer-badges">\r | |
| 90 | </div>\r | |
| 91 | </div>\r | |
| 92 | </body>\r | |
| 93 | </html>\r |