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6 | <title>ImplementSuffix</title>\r | |
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22 | <a href="./Home">MLton 20180207</a>\r | |
23 | </div>\r | |
24 | </div>\r | |
25 | <div id="header">\r | |
26 | <h1>ImplementSuffix</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="ImplementSuffix">ImplementSuffix</a> is a pass for the <a href="SXML">SXML</a>\r | |
32 | <a href="IntermediateLanguage">IntermediateLanguage</a>, invoked from <a href="SXMLSimplify">SXMLSimplify</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 implements the <span class="monospaced">TopLevel_setSuffix</span> primitive, which\r | |
39 | installs a function to exit the program.</p></div>\r | |
40 | </div>\r | |
41 | </div>\r | |
42 | <div class="sect1">\r | |
43 | <h2 id="_implementation">Implementation</h2>\r | |
44 | <div class="sectionbody">\r | |
45 | <div class="ulist"><ul>\r | |
46 | <li>\r | |
47 | <p>\r | |
48 | <a href="https://github.com/MLton/mlton/blob/master/mlton/xml/implement-suffix.fun"><span class="monospaced">implement-suffix.fun</span></a>\r | |
49 | </p>\r | |
50 | </li>\r | |
51 | </ul></div>\r | |
52 | </div>\r | |
53 | </div>\r | |
54 | <div class="sect1">\r | |
55 | <h2 id="_details_and_notes">Details and Notes</h2>\r | |
56 | <div class="sectionbody">\r | |
57 | <div class="paragraph"><p><a href="ImplementSuffix">ImplementSuffix</a> works by introducing a new <span class="monospaced">ref</span> cell to contain\r | |
58 | the function of type <span class="monospaced">unit -> unit</span> that should be called on program\r | |
59 | exit.</p></div>\r | |
60 | <div class="ulist"><ul>\r | |
61 | <li>\r | |
62 | <p>\r | |
63 | The following code (appropriately alpha-converted) is appended to the beginning of the <a href="SXML">SXML</a> program:\r | |
64 | </p>\r | |
65 | <div class="listingblock">\r | |
66 | <div class="content"><div class="highlight"><pre><span class="k">val</span><span class="w"> </span><span class="n">z_0</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r | |
67 | <span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="n">a_0</span><span class="w"> </span><span class="p">=></span><span class="w"></span>\r | |
68 | <span class="w"> </span><span class="k">let</span><span class="w"></span>\r | |
69 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">x_0</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r | |
70 | <span class="w"> </span><span class="s">"toplevel suffix not installed"</span><span class="w"></span>\r | |
71 | <span class="w"> </span><span class="k">val</span><span class="w"> </span><span class="n">x_1</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r | |
72 | <span class="w"> </span><span class="n">MLton_bug</span><span class="w"> </span><span class="p">(</span><span class="n">x_0</span><span class="p">)</span><span class="w"></span>\r | |
73 | <span class="w"> </span><span class="k">in</span><span class="w"></span>\r | |
74 | <span class="w"> </span><span class="n">x_1</span><span class="w"></span>\r | |
75 | <span class="w"> </span><span class="k">end</span><span class="w"></span>\r | |
76 | <span class="k">val</span><span class="w"> </span><span class="n">topLevelSuffixCell</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r | |
77 | <span class="w"> </span><span class="n">Ref_ref</span><span class="w"> </span><span class="p">(</span><span class="n">z_0</span><span class="p">)</span><span class="w"></span>\r | |
78 | </pre></div></div></div>\r | |
79 | </li>\r | |
80 | <li>\r | |
81 | <p>\r | |
82 | Any occurrence of\r | |
83 | </p>\r | |
84 | <div class="listingblock">\r | |
85 | <div class="content"><div class="highlight"><pre><span class="k">val</span><span class="w"> </span><span class="n">x_0</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r | |
86 | <span class="w"> </span><span class="n">TopLevel_setSuffix</span><span class="w"> </span><span class="p">(</span><span class="n">f_0</span><span class="p">)</span><span class="w"></span>\r | |
87 | </pre></div></div></div>\r | |
88 | <div class="paragraph"><p>is rewritten to</p></div>\r | |
89 | <div class="listingblock">\r | |
90 | <div class="content"><div class="highlight"><pre><span class="k">val</span><span class="w"> </span><span class="n">x_0</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r | |
91 | <span class="w"> </span><span class="n">Ref_assign</span><span class="w"> </span><span class="p">(</span><span class="n">topLevelSuffixCell</span><span class="p">,</span><span class="w"> </span><span class="n">f_0</span><span class="p">)</span><span class="w"></span>\r | |
92 | </pre></div></div></div>\r | |
93 | </li>\r | |
94 | <li>\r | |
95 | <p>\r | |
96 | The following code (appropriately alpha-converted) is appended to the end of the <a href="SXML">SXML</a> program:\r | |
97 | </p>\r | |
98 | <div class="listingblock">\r | |
99 | <div class="content"><div class="highlight"><pre><span class="k">val</span><span class="w"> </span><span class="n">f_0</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r | |
100 | <span class="w"> </span><span class="n">Ref_deref</span><span class="w"> </span><span class="p">(</span><span class="n">topLevelSuffixCell</span><span class="p">)</span><span class="w"></span>\r | |
101 | <span class="k">val</span><span class="w"> </span><span class="n">z_0</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r | |
102 | <span class="w"> </span><span class="p">()</span><span class="w"></span>\r | |
103 | <span class="k">val</span><span class="w"> </span><span class="n">x_0</span><span class="w"> </span><span class="p">=</span><span class="w"></span>\r | |
104 | <span class="w"> </span><span class="n">f_0</span><span class="w"> </span><span class="n">z_0</span><span class="w"></span>\r | |
105 | </pre></div></div></div>\r | |
106 | </li>\r | |
107 | </ul></div>\r | |
108 | </div>\r | |
109 | </div>\r | |
110 | </div>\r | |
111 | <div id="footnotes"><hr></div>\r | |
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113 | <div id="footer-text">\r | |
114 | </div>\r | |
115 | <div id="footer-badges">\r | |
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118 | </body>\r | |
119 | </html>\r |