<!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="API documentation for the Rust `memory_grow` fn in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, memory_grow"><title>core::arch::wasm32::memory_grow - Rust</title><link rel="stylesheet" type="text/css" href="../../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../light1.35.0.css" id="themeStyle"><script src="../../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../core/index.html'><img src='../../../rust-logo1.35.0.png' alt='logo' width='100'></a><div class="sidebar-elems"><p class='location'><a href='../../index.html'>core</a>::<wbr><a href='../index.html'>arch</a>::<wbr><a href='index.html'>wasm32</a></p><script>window.sidebarCurrent = {name: 'memory_grow', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><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><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span class='since' title='Stable since Rust version 1.33.0'>1.33.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../../src/core/up/stdsimd/crates/core_arch/src/wasm32/memory.rs.html#57-64' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='../../index.html'>core</a>::<wbr><a href='../index.html'>arch</a>::<wbr><a href='index.html'>wasm32</a>::<wbr><a class="fn" href=''>memory_grow</a></span></h1><pre class='rust fn'>pub fn memory_grow(mem: u32, delta: usize) -> usize</pre><div class='stability'><div class='stab portability'>This is supported on <strong>WebAssembly</strong> only.</div></div><div class='docblock'><p>Corresponding intrinsic to wasm's <a href="http://webassembly.github.io/spec/core/exec/instructions.html#exec-memory-grow"><code>memory.grow</code> instruction</a></p>
<p>This function, when called, will attempt to grow the default linear memory
by the specified <code>delta</code> of pages. The current WebAssembly page size is
65536 bytes (64 KB). If memory is successfully grown then the previous size
of memory, in pages, is returned. If memory cannot be grown then
<code>usize::max_value()</code> is returned.</p>
<p>The argument <code>mem</code> is the numerical index of which memory to return the
size of. Note that currently the WebAssembly specification only supports one
memory, so it is required that zero is passed in. The argument is present to
be forward-compatible with future WebAssembly revisions. If a nonzero
argument is passed to this function it will currently unconditionally abort.</p>
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