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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `crates/yulgen/src/constructor.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>constructor.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script>
<noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../fe_yulgen/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::names::abi</span> <span class="kw">as</span> <span class="ident">abi_names</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::operations::abi</span> <span class="kw">as</span> <span class="ident">abi_operations</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::runtime::functions</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::types</span>::{<span class="ident">AbiDecodeLocation</span>, <span class="ident">AbiType</span>};
<span class="kw">use</span> <span class="ident">yultsur</span>::<span class="kw-2">*</span>;
<span class="doccomment">/// Builds a constructor for a contract with no init function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The contract is simply deployed by loading the code into memory and</span>
<span class="doccomment">/// returning it.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build</span>() -> <span class="ident">yul::Code</span> {
<span class="comment">// we get the deployment statements and wrap them in a code block</span>
<span class="kw">let</span> <span class="ident">deployment</span> <span class="op">=</span> <span class="ident">deployment</span>();
<span class="macro">code!</span> { [<span class="ident">deployment</span>...] }
}
<span class="doccomment">/// Builds a constructor for a contract with an init function.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build_with_init</span>(
<span class="ident">contract_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">init_function_name</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">init_params</span>: <span class="kw-2">&</span>[<span class="ident">AbiType</span>],
<span class="ident">init_callgraph</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">yul::Statement</span><span class="op">></span>,
) -> <span class="ident">yul::Code</span> {
<span class="comment">// Generate names for our constructor parameters.</span>
<span class="kw">let</span> (<span class="ident">param_idents</span>, <span class="ident">param_exprs</span>) <span class="op">=</span> <span class="ident">abi_names::vals</span>(<span class="string">"init"</span>, <span class="ident">init_params</span>.<span class="ident">len</span>());
<span class="kw">let</span> <span class="ident">decode_fns</span> <span class="op">=</span> <span class="ident">functions::abi::decode_functions</span>(<span class="ident">init_params</span>, <span class="ident">AbiDecodeLocation::Memory</span>);
<span class="comment">// Decode the parameters, if any are given.</span>
<span class="kw">let</span> <span class="ident">maybe_decode_params</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">init_params</span>.<span class="ident">is_empty</span>() {
<span class="macro">statements!</span> {}
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">decode_expr</span> <span class="op">=</span> <span class="ident">abi_operations::decode_data</span>(
<span class="ident">init_params</span>,
<span class="macro">expression!</span> { <span class="ident">params_start_mem</span> },
<span class="macro">expression!</span> { <span class="ident">params_end_mem</span> },
<span class="ident">AbiDecodeLocation::Memory</span>,
);
<span class="macro">statements!</span> { (<span class="kw">let</span> [<span class="ident">param_idents</span>...] :<span class="op">=</span> [<span class="ident">decode_expr</span>]) }
};
<span class="comment">// init function name after it is mapped.</span>
<span class="kw">let</span> <span class="ident">init_function_name</span> <span class="op">=</span> <span class="macro">identifier!</span> { (<span class="ident">init_function_name</span>) };
<span class="kw">let</span> <span class="ident">contract_name</span> <span class="op">=</span> <span class="macro">literal_expression!</span> { (<span class="macro">format!</span>(<span class="string">"\"{}\""</span>, <span class="ident">contract_name</span>)) };
<span class="kw">let</span> <span class="ident">deployment</span> <span class="op">=</span> <span class="ident">deployment</span>();
<span class="comment">// Build a constructor that runs a user defined init function. Parameters for</span>
<span class="comment">// init functions are appended to the end of the initialization code.</span>
<span class="comment">//</span>
<span class="comment">// The start of the init parameters in code is stored in `params_start_code`.</span>
<span class="comment">// The parameters are immediately copied from this location into memory at</span>
<span class="comment">// `mem_start`. From there, parameters are decoded and passed into the</span>
<span class="comment">// init function.</span>
<span class="macro">code!</span> {
<span class="comment">// add init function and dependencies to scope</span>
[<span class="ident">init_callgraph</span>...]
[<span class="ident">decode_fns</span>...]
<span class="comment">// copy the encoded parameters to memory</span>
(<span class="kw">let</span> <span class="ident">params_start_code</span> :<span class="op">=</span> <span class="ident">datasize</span>([<span class="ident">contract_name</span>]))
(<span class="kw">let</span> <span class="ident">params_end_code</span> :<span class="op">=</span> <span class="ident">codesize</span>())
(<span class="kw">let</span> <span class="ident">params_size</span> :<span class="op">=</span> <span class="ident">sub</span>(<span class="ident">params_end_code</span>, <span class="ident">params_start_code</span>))
(<span class="kw">let</span> <span class="ident">params_start_mem</span> :<span class="op">=</span> <span class="ident">alloc</span>(<span class="ident">params_size</span>))
(<span class="kw">let</span> <span class="ident">params_end_mem</span> :<span class="op">=</span> <span class="ident">add</span>(<span class="ident">params_start_mem</span>, <span class="ident">params_size</span>))
(<span class="ident">codecopy</span>(<span class="ident">params_start_mem</span>, <span class="ident">params_start_code</span>, <span class="ident">params_size</span>))
<span class="comment">// decode the parameters from memory</span>
[<span class="ident">maybe_decode_params</span>...]
<span class="comment">// call the init function defined above</span>
(<span class="ident">pop</span>(([<span class="ident">init_function_name</span>]([<span class="ident">param_exprs</span>...]))))
<span class="comment">// deploy the contract</span>
[<span class="ident">deployment</span>...]
}
}
<span class="doccomment">/// Copies contract data to memory and returns it.</span>
<span class="kw">fn</span> <span class="ident">deployment</span>() -> <span class="ident">Vec</span><span class="op"><</span><span class="ident">yul::Statement</span><span class="op">></span> {
<span class="macro">statements!</span> {
(<span class="kw">let</span> <span class="ident">size</span> :<span class="op">=</span> <span class="ident">datasize</span>(<span class="string">"runtime"</span>))
(<span class="ident">datacopy</span>(<span class="number">0</span>, (<span class="ident">dataoffset</span>(<span class="string">"runtime"</span>)), <span class="ident">size</span>))
(<span class="kw">return</span>(<span class="number">0</span>, <span class="ident">size</span>))
}
}
</code></pre></div>
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