<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `Ctx` struct in crate `wasmer_runtime_core`."><metaname="keywords"content="rust, rustlang, rust-lang, Ctx"><title>wasmer_runtime_core::vm::Ctx - Rust</title><linkrel="stylesheet"type="text/css"href="../../normalize.css"><linkrel="stylesheet"type="text/css"href="../../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../../dark.css"><linkrel="stylesheet"type="text/css"href="../../light.css"id="themeStyle"><scriptsrc="../../storage.js"></script><noscript><linkrel="stylesheet"href="../../noscript.css"></noscript><linkrel="shortcut icon"href="https://wasmer.io/static/icons/favicon.ico"><styletype="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><bodyclass="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../../wasmer_runtime_core/index.html'><divclass='logo-container'><imgsrc='https://avatars3.githubusercontent.com/u/44205449?s=200&v=4'alt='logo'></div></a><pclass='location'>Struct Ctx</p><divclass="sidebar-elems"><divclass="block items"><aclass="sidebar-title"href="#fields">Fields</a><divclass="sidebar-links"><ahref="#structfield.internal">internal</a><ahref="#structfield.local_backing">local_backing</a><ahref="#structfield.import_backing">import_backing</a><ahref="#structfield.module">module</a><ahref="#structfield.data">data</a><ahref="#structfield.data_finalizer">data_finalizer</a></div><aclass="sidebar-title"href="#methods">Methods</a><divclass="sidebar-links"><ahref="#method.borrow_symbol_map">borrow_symbol_map</a><ahref="#method.dynamic_sigindice_count">dynamic_sigindice_count</a><ahref="#method.get_internal">get_internal</a><ahref="#method.memory">memory</a><ahref="#method.set_internal">set_internal</a></div><aclass="sidebar-title"href="#implementations">Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-Debug">Debug</a><ahref="#impl-Drop">Drop</a></div><aclass="sidebar-title"href="#synthetic-implementations">Auto Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-RefUnwindSafe">!RefUnwindSafe</a><ahref="#impl-Send">!Send</a><ahref="#impl-Sync">!Sync</a><ahref="#impl-Unpin">Unpin</a><ahref="#impl-UnwindSafe">!UnwindSafe</a></div><aclass="sidebar-title"href="#blanket-implementations">Blanket Implementations</a><divclass="sidebar-links"><ahref="#impl-Any">Any</a><ahref="#impl-Borrow%3CT%3E">Borrow<T></a><ahref="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><ahref="#impl-From%3CT%3E">From<T></a><ahref="#impl-Into%3CU%3E">Into<U></a><ahref="#impl-TryFrom%3CU%3E">TryFrom<U></a><ahref="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><pclass='location'><ahref='../index.html'>wasmer_runtime_core</a>::<wbr><ahref='index.html'>vm</a></p><script>window.sidebarCurrent={name:'Ctx',ty:'struct',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../../settings.html"><imgsrc="../../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><
Fields<ahref='#fields'class='anchor'></a></h2><spanid="structfield.internal"class="structfield small-section-header"><ahref="#structfield.internal"class="anchor field"></a><codeid="internal.v">internal: InternalCtx</code></span><spanid="structfield.local_backing"class="structfield small-section-header"><ahref="#structfield.local_backing"class="anchor field"></a><codeid="local_backing.v">local_backing: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut </a><aclass="struct"href="../../wasmer_runtime_core/vm/struct.LocalBacking.html"title="struct wasmer_runtime_core::vm::LocalBacking">LocalBacking</a></code></span><divclass='docblock'><p>These are pointers to things that are known to be owned
by the owning <code>Instance</code>.</p>
</div><spanid="structfield.import_backing"class="structfield small-section-header"><ahref="#structfield.import_backing"class="anchor field"></a><codeid="import_backing.v">import_backing: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut </a><aclass="struct"href="../../wasmer_runtime_core/vm/struct.ImportBacking.html"title="struct wasmer_runtime_core::vm::ImportBacking">ImportBacking</a></code></span><spanid="structfield.module"class="structfield small-section-header"><ahref="#structfield.module"class="anchor field"></a><codeid="module.v">module: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*const </a>ModuleInner</code></span><spanid="structfield.data"class="structfield small-section-header"><ahref="#structfield.data"class="anchor field"></a><codeid="data.v">data: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut </a><aclass="enum"href="https://doc.rust-lang.org/nightly/core/ffi/enum.c_void.html"title="enum core::ffi::c_void">c_void</a></code></span><divclass='docblock'><p>This is intended to be user-supplied, per-instance
contextual data. There are currently some issue with it,
notably that it cannot be set before running the <code>start</code>
function in a WebAssembly module.</p>
<p><ahref="https://github.com/wasmerio/wasmer/pull/219">#219</a> fixes that
issue, as well as allowing the user to have <em>per-function</em>
context, instead of just per-instance.</p>
</div><spanid="structfield.data_finalizer"class="structfield small-section-header"><ahref="#structfield.data_finalizer"class="anchor field"></a><codeid="data_finalizer.v">data_finalizer: <aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.fn.html">fn</a>(data: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut </a><aclass="enum"href="https://doc.rust-lang.org/nightly/core/ffi/enum.c_void.html"title="enum core::ffi::c_void">c_void</a>)></code></span><divclass='docblock'><p>If there's a function set in this field, it gets called
when the context is destructed, e.g. when an <code>Instance</code>
is dropped.</p>
</div><h2id='methods'class='small-section-header'>Methods<ahref='#methods'class='anchor'></a></h2><h3id='impl'class='impl'><codeclass='in-band'>impl <aclass="struct"href="../../wasmer_runtime_core/vm/struct.Ctx.html"title="struct wasmer_runtime_core::vm::Ctx">Ctx</a></code><ahref='#impl'class='anchor'></a><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#237-396'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.memory'class="method"><codeid='memory.v'>pub fn <ahref='#method.memory'class='fnname'>memory</a>(&self, mem_index: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) ->&<aclass="struct"href="../../wasmer_runtime_core/memory/struct.Memory.html"title="struct wasmer_runtime_core::memory::Memory">Memory</a></code><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#360-373'title='goto source code'>[src]</a></h4><divclass='docblock'><p>This exposes the specified memory of the WebAssembly instance
as a immutable slice.</p>
<p>WebAssembly will soon support multiple linear memories, so this
</div><h4id='method.borrow_symbol_map'class="method"><codeid='borrow_symbol_map.v'>pub unsafe fn <ahref='#method.borrow_symbol_map'class='fnname'>borrow_symbol_map</a>(&self) ->&<aclass="enum"href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html"title="enum core::option::Option">Option</a><<aclass="struct"href="https://doc.rust-lang.org/nightly/std/collections/hash/map/struct.HashMap.html"title="struct std::collections::hash::map::HashMap">HashMap</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html"title="struct alloc::string::String">String</a>>></code><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#376-378'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Gives access to the emscripten symbol map, used for debugging</p>
</div><h4id='method.dynamic_sigindice_count'class="method"><codeid='dynamic_sigindice_count.v'>pub fn <ahref='#method.dynamic_sigindice_count'class='fnname'>dynamic_sigindice_count</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#381-383'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Returns the number of dynamic sigindices.</p>
</div><h4id='method.get_internal'class="method"><codeid='get_internal.v'>pub fn <ahref='#method.get_internal'class='fnname'>get_internal</a>(&self, field: &<aclass="struct"href="../../wasmer_runtime_core/vm/struct.InternalField.html"title="struct wasmer_runtime_core::vm::InternalField">InternalField</a>) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#386-388'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Returns the value of the specified internal field.</p>
</div><h4id='method.set_internal'class="method"><codeid='set_internal.v'>pub fn <ahref='#method.set_internal'class='fnname'>set_internal</a>(&mut self, field: &<aclass="struct"href="../../wasmer_runtime_core/vm/struct.InternalField.html"title="struct wasmer_runtime_core::vm::InternalField">InternalField</a>, value: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>)</code><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#391-395'title='goto source code'>[src]</a></h4><divclass='docblock'><p>Writes the value to the specified internal field.</p>
</div></div><h2id='implementations'class='small-section-header'>Trait Implementations<ahref='#implementations'class='anchor'></a></h2><divid='implementations-list'><h3id='impl-Drop'class='impl'><codeclass='in-band'>impl <aclass="trait"href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html"title="trait core::ops::drop::Drop">Drop</a> for <aclass="struct"href="../../wasmer_runtime_core/vm/struct.Ctx.html"title="struct wasmer_runtime_core::vm::Ctx">Ctx</a></code><ahref='#impl-Drop'class='anchor'></a><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#67-73'title='goto source code'>[src]</a></h3><divclass='docblock'><p>When an instance context is destructed, we're calling its <code>data_finalizer</code>
In order avoid leaking resources.</p>
<p>Implementing the <code>data_finalizer</code> function is the responsibility of the <code>wasmer</code> end-user.</p>
<p>See test: <code>test_data_finalizer</code> as an example</p>
</div><divclass='impl-items'><h4id='method.drop'class="method hidden"><codeid='drop.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop'class='fnname'>drop</a>(&mut self)</code><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#68-72'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Executes the destructor for this type. <ahref="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></p>
</div></div><h3id='impl-Debug'class='impl'><codeclass='in-band'>impl <aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a> for <aclass="struct"href="../../wasmer_runtime_core/vm/struct.Ctx.html"title="struct wasmer_runtime_core::vm::Ctx">Ctx</a></code><ahref='#impl-Debug'class='anchor'></a><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#31'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.fmt'class="method hidden"><codeid='fmt.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt'class='fnname'>fmt</a>(&self, f: &mut <aclass="struct"href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html"title="struct core::fmt::Formatter">Formatter</a>) -><aclass="type"href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html"title="type core::fmt::Result">Result</a></code><aclass='srclink'href='../../src/wasmer_runtime_core/vm.rs.html#31'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Formats the value using the given formatter. <ahref="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3id='impl-From%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html"title="trait core::convert::From">From</a><T> for T</code><ahref='#impl-From%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#552-554'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.from'class="method hidden"><codeid='from.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from'class='fnname'>from</a>(t: T) -> T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#553'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-TryFrom%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>, </span></code><ahref='#impl-TryFrom%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#571-577'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error'class="type"><codeid='Error.t'>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error'class="type">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html"title="enum core::convert::Infallible">Infallible</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_from'class="method hidden"><codeid='try_from.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from'class='fnname'>try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#574-576'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-TryInto%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><ahref='#impl-TryInto%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#559-566'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error-1'class="type"><codeid='Error.t-1'>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error'class="type">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_into'class="method hidden"><codeid='try_into.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into'class='fnname'>try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#563-565'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-BorrowMut%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html"title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <spanclass="where fmt-newline">where<br> T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-BorrowMut%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#218-220'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.borrow_mut'class="method hidden"><codeid='borrow_mut.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut'class='fnname'>borrow_mut</a>(&mut self) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#219'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Mutably borrows from an owned value. <ahref="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
</div></div><h3id='impl-Borrow%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html"title="trait core::borrow::Borrow">Borrow</a><T> for T <spanclass="where fmt-newline">where<br> T: ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-Borrow%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#213-215'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.borrow'class="method hidden"><codeid='borrow.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow'class='fnname'>borrow</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Immutably borrows from an owned value. <ahref="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
</div></div><h3id='impl-Any'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> for T <spanclass="where fmt-newline">where<br> T: 'static + ?<aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html"title="trait core::marker::Sized">Sized</a>, </span></code><ahref='#impl-Any'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#100-102'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.type_id'class="method hidden"><codeid='type_id.v'>fn <ahref='https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id'class='fnname'>type_id</a>(&self) -><aclass="struct"href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html"title="struct core::any::TypeId">TypeId</a></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#101'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <ahref="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
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