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Understanding WebAssembly text format - WebAssembly
to enable
webassembly to be read and edited by humans, there is a textual representation of the wasm binary format.
... note: this is potentially overkill if you are a web developer who just wants to load a wasm module into a page and use it in your code (see using the
webassembly javascript api), but it is more useful if for example, you want to write wasm modules to optimize the performance of your javascript library, or build your own
webassembly compiler.
... s-expressions in both the binary and textual formats, the fundamental unit of code in
webassembly is a module.
...And 52 more matches
WebAssembly Concepts - WebAssembly
this article explains the concepts behind how
webassembly works including its goals, the problems it solves, and how it runs inside the web browser's rendering engine.
... what is
webassembly?
...
webassembly is a new type of code that can be run in modern web browsers and provides new features and major gains in performance.
...And 42 more matches
Using the WebAssembly JavaScript API - WebAssembly
if you have already compiled a module from another language using tools like emscripten, or loaded and run the code yourself, the next step is to learn more about using the other features of the
webassembly javascript api.
... note: if you are unfamiliar with the basic concepts mentioned in this article and need more explanation, read
webassembly concepts first, then come back.
... some simple examples let’s run through some examples that explain how to use the
webassembly javascript api, and how to use it to load a wasm module in a web page.
...And 36 more matches
Compiling from Rust to WebAssembly - WebAssembly
if you have some rust code, you can compile it into
webassembly (wasm).
... rust and
webassembly use cases there are two main use cases for rust and
webassembly: to build an entire application — an entire web app based in rust.
...this package will contain only
webassembly and javascript code, and so the users of the package won't need rust installed.
...And 15 more matches
Loading and running WebAssembly code - WebAssembly
to use
webassembly in javascript, you first need to pull your module into memory before compilation/instantiation.
... this article provides a reference for the different mechanisms that can be used to fetch
webassembly bytecode, as well as how to compile/instantiate then run it.
...
webassembly is not yet integrated with <script type='module'> or es2015 import statements, thus there is not a path to have the browser fetch modules for you using imports.
...And 12 more matches
Exported WebAssembly functions - WebAssembly
exported
webassembly functions are how
webassembly functions are represented in javascript.
... exported
webassembly functions are basically just javascript wrappers that represent
webassembly functions in javascript.
... you can retrieve exported
webassembly functions in two ways: by calling table.prototype.get() on an existing table.
...And 6 more matches
Caching compiled WebAssembly modules - WebAssembly
warning: experimental
webassembly.module indexeddb serialization support is being removed from browsers; see bug 1469395 and this spec issue.
... caching is useful for improving the performance of an app — we can store compiled
webassembly modules on the client so they don't have to be downloaded and compiled every time.
... this includes compiled wasm modules (
webassembly.module javascript objects).
...And 5 more matches
Converting WebAssembly text format to wasm - WebAssembly
webassembly has an s-expression-based textual representation, an intermediate form designed to be exposed in text editors, browser developer tools, etc.
...historically, a .wast extension was also used, however that's now used for the scripting language used by the
webassembly testsuite.
... a first look at the text format let’s look at a simple example of this — the following program imports a function called imported_func from a module called imports, and exports a function called exported_func: (module (func $i (import "imports" "imported_func") (param i32)) (func (export "exported_func") i32.const 42 call $i ) ) the
webassembly function exported_func is exported for use in our environment (e.g.
...And 3 more matches
Compiling a New C/C++ Module to WebAssembly - WebAssembly
when you’ve written a new code module in a language like c/c++, you can compile it into
webassembly using a tool like emscripten.
... creating html and javascript this is the simplest case we'll look at, whereby you get emscripten to generate everything you need to run your code, as
webassembly, in the browser.
...ld have: the binary wasm module code (hello.wasm) a javascript file containing glue code to translate between the native c functions, and javascript/wasm (hello.js) an html file to load, compile, and instantiate your wasm code, and display its output in the browser (hello.html) running your example now all that remains is for you to load the resulting hello.html in a browser that supports
webassembly.
...And 2 more matches
WebAssembly
webassembly is a new type of code that can be run in modern web browsers — it is a low-level assembly-like language with a compact binary format that runs with near-native performance and provides languages such as c/c++, c# and rust with a compilation target so that they can run on the web.
... in a nutshell
webassembly has huge implications for the web platform — it provides a way to run code written in multiple languages on the web at near native speed, with client apps running on the web that previously couldn’t have done so.
...
webassembly is designed to complement and run alongside javascript — using the
webassembly javascript apis, you can load
webassembly modules into a javascript app and share functionality between the two.
...And 26 more matches
WebAssembly.instantiate() - JavaScript
the
webassembly.instantiate() function allows you to compile and instantiate
webassembly code.
... this function has two overloads: the primary overload takes the
webassembly binary code, in the form of a typed array or arraybuffer, and performs both compilation and instantiation in one step.
... the returned promise resolves to both a compiled
webassembly.module and its first
webassembly.instance.
...And 21 more matches
WebAssembly - JavaScript
the
webassembly javascript object acts as the namespace for all
webassembly-related functionality.
... unlike most other global objects,
webassembly is not a constructor (it is not a function object).
... description the primary uses for the
webassembly object are: loading
webassembly code, using the
webassembly.instantiate() function.
...And 17 more matches
WebAssembly.Memory() constructor - JavaScript
the
webassembly.memory() constructor creates a new memory object whose buffer property is a resizable arraybuffer or sharedarraybuffer that holds the raw bytes of memory accessed by a
webassembly instance.
... a memory created by javascript or in
webassembly code will be accessible and mutable from both javascript and
webassembly.
... syntax new
webassembly.memory(memorydescriptor); parameters memorydescriptor an object that can contain the following members: initial the initial size of the
webassembly memory, in units of
webassembly pages.
...And 10 more matches
Index - WebAssembly
found 12 pages: # page tags and summary 1
webassembly landing,
webassembly, wasm
webassembly is a new type of code that can be run in modern web browsers — it is a low-level assembly-like language with a compact binary format that runs with near-native performance and provides languages such as c/c++ with a compilation target so that they can run on the web.
... 2 caching compiled
webassembly modules caching, indexeddb, javascript, module,
webassembly, compile, wasm caching is useful for improving the performance of an app — we can store compiled
webassembly modules on the client so they don't have to be downloaded and compiled every time.
... 3 compiling a new c/c++ module to
webassembly c, c++, compiling, emscripten,
webassembly, wasm when you’ve written a new code module in a language like c/c++, you can compile it into
webassembly using a tool like emscripten.
...And 9 more matches
WebAssembly.CompileError - JavaScript
the
webassembly.compileerror object indicates an error during
webassembly decoding or validation.
... constructor
webassembly.compileerror() creates a new
webassembly.compileerror object.
... instance properties
webassembly.compileerror.prototype.message error message.
...And 8 more matches
WebAssembly.LinkError - JavaScript
the
webassembly.linkerror object indicates an error during module instantiation (besides traps from the start function).
... constructor
webassembly.linkerror() creates a new
webassembly.linkerror object.
... instance properties
webassembly.linkerror.prototype.message error message.
...And 8 more matches
WebAssembly.Memory - JavaScript
the
webassembly.memory object is a resizable arraybuffer or sharedarraybuffer that holds the raw bytes of memory accessed by a
webassembly instance.
... a memory created by javascript or in
webassembly code will be accessible and mutable from both javascript and
webassembly.
... constructor
webassembly.memory() creates a new memory object.
...And 8 more matches
WebAssembly.RuntimeError - JavaScript
the
webassembly.runtimeerror object is the error type that is thrown whenever
webassembly specifies a trap.
... constructor
webassembly.runtimeerror() creates a new
webassembly.runtimeerror object.
... instance properties
webassembly.runtimeerror.prototype.message error message.
...And 8 more matches
WebAssembly.Module - JavaScript
a
webassembly.module object contains stateless
webassembly code that has already been compiled by the browser — this can be efficiently shared with workers, and instantiated multiple times.
... constructor
webassembly.module() creates a new module object.
... static properties
webassembly.module.customsections() given a module and string, returns a copy of the contents of all custom sections in the module with the given string name.
...And 6 more matches
WebAssembly.Table() constructor - JavaScript
the
webassembly.table() constructor creates a new table object of the given size and element type.
... syntax new
webassembly.table(tabledescriptor); parameters tabledescriptor an object that can contain the following members: element a string representing the type of value to be stored in the table.
... initial the initial number of elements of the
webassembly table.
...And 6 more matches
WebAssembly.instantiateStreaming() - JavaScript
the
webassembly.instantiatestreaming() function compiles and instantiates a
webassembly module directly from a streamed underlying source.
... syntax promise<resultobject>
webassembly.instantiatestreaming(source, importobject); parameters source a response object or a promise that will fulfill with one, representing the underlying source of a .wasm module you want to stream, compile, and instantiate.
... importobject optional an object containing the values to be imported into the newly-created instance, such as functions or
webassembly.memory objects.
...And 6 more matches
WebAssembly.Table - JavaScript
the
webassembly.table() object is a javascript wrapper object — an array-like structure representing a
webassembly table, which stores function references.
... a table created by javascript or in
webassembly code will be accessible and mutable from both javascript and
webassembly.
... constructor
webassembly.table() creates a new table object.
...And 5 more matches
WebAssembly.compileStreaming() - JavaScript
the
webassembly.compilestreaming() function compiles a
webassembly.module directly from a streamed underlying source.
... this function is useful if it is necessary to a compile a module before it can be instantiated (otherwise, the
webassembly.instantiatestreaming() function should be used).
... syntax promise<
webassembly.module>
webassembly.compilestreaming(source); parameters source a response object or a promise that will fulfill with one, representing the underlying source of a .wasm module you want to stream and compile.
...And 5 more matches
WebAssembly.Global - JavaScript
a
webassembly.global object represents a global variable instance, accessible from both javascript and importable/exportable across one or more
webassembly.module instances.
... constructor
webassembly.global() creates a new global object.
...by default this is the
webassembly.global() constructor.
...And 4 more matches
WebAssembly.Instance() constructor - JavaScript
the
webassembly.instance() constructor creates a new instance object which is a stateful, executable instance of a
webassembly.module.
... syntax important: since instantiation for large modules can be expensive, developers should only use the instance() constructor when synchronous instantiation is absolutely required; the asynchronous
webassembly.instantiatestreaming() method should be used at all other times.
... new
webassembly.instance(module, importobject); parameters module the
webassembly.module object to be instantiated.
...And 4 more matches
WebAssembly.Module.exports() - JavaScript
the
webassembly.module.exports() function returns an array containing descriptions of all the declared exports of the given module.
... syntax
webassembly.module.exports(module); parameters module a
webassembly.module object.
... exceptions if module is not a
webassembly.module object instance, a typeerror is thrown.
...And 4 more matches
WebAssembly.Table.prototype.set() - JavaScript
the set() prototype method of the
webassembly.table object mutates a reference stored at a given index to a different value.
...this must be an exported
webassembly function, a javascript wrapper for an underlying wasm function.
... if value is not an exported
webassembly function or null, a typeerror is thrown.
...And 4 more matches
WebAssembly.compile() - JavaScript
the
webassembly.compile() function compiles
webassembly binary code into a
webassembly.module object.
... this function is useful if it is necessary to a compile a module before it can be instantiated (otherwise, the
webassembly.instantiate() function should be used).
... syntax promise<
webassembly.module>
webassembly.compile(buffersource); parameters buffersource a typed array or arraybuffer containing the binary code of the .wasm module you want to compile.
...And 4 more matches
WebAssembly.Instance - JavaScript
a
webassembly.instance object is a stateful, executable instance of a
webassembly.module.
... instance objects contain all the exported
webassembly functions that allow calling into
webassembly code from javascript.
... constructor
webassembly.instance() creates a new instance object.
...And 3 more matches
WebAssembly.Memory.prototype.grow() - JavaScript
the grow() protoype method of the memory object increases the size of the memory instance by a specified number of
webassembly pages.
... syntax memory.grow(number); parameters number the number of
webassembly pages you want to grow the memory by (each one is 64kib in size).
... return value the previous size of the memory, in units of
webassembly pages.
...And 3 more matches
WebAssembly.Module() constructor - JavaScript
a
webassembly.module() constructor creates a new module object containing stateless
webassembly code that has already been compiled by the browser and can be efficiently shared with workers, and instantiated multiple times.
... the
webassembly.module() constructor function can be called to synchronously compile given
webassembly binary code.
... however, the primary way to get a module is through an asynchronous compilation function like
webassembly.compile().
...And 3 more matches
WebAssembly.Module.customSections() - JavaScript
the
webassembly.customsections() function returns a copy of the contents of all custom sections in the given module with the given string name.
... syntax
webassembly.module.customsections(module, sectionname); parameters module the
webassembly.module object whose custom sections are being considered.
... exceptions if module is not a
webassembly.module object instance, a typeerror is thrown.
...And 3 more matches
WebAssembly.Global() constructor - JavaScript
a
webassembly.global() constructor creates a new global object representing a global variable instance, accessible from both javascript and importable/exportable across one or more
webassembly.module instances.
... syntax new
webassembly.global(descriptor, value); parameters descriptor a globaldescriptor dictionary object, which contains two properties: value: a usvstring representing the data type of the global.
... examples creating a new global instance the following example shows a new global instance being created using the
webassembly.global() constructor.
...And 2 more matches
WebAssembly.Instance.prototype.exports - JavaScript
the exports readonly property of the
webassembly.instance object prototype returns an object containing as its members all the functions exported from the
webassembly module instance, to allow them to be accessed and used by javascript.
... instance.exports examples using exports after fetching some
webassembly bytecode using fetch, we compile and instantiate the module using the
webassembly.instantiatestreaming() function, importing a javascript function into the
webassembly module in the process.
... we then call an exported
webassembly function that is exported by the instance.
...And 2 more matches
WebAssembly.Table.prototype.get() - JavaScript
the get() prototype method of the
webassembly.table() object retrieves a function reference stored at a given index.
... return value a function reference — this is an exported
webassembly function, a javascript wrapper for an underlying wasm function.
... examples using get the following example (see table.html on github, and view it live also) compiles and instantiates the loaded table.wasm byte code using the
webassembly.instantiatestreaming() method.
...And 2 more matches
WebAssembly.CompileError() constructor - JavaScript
the
webassembly.compileerror() constructor creates a new
webassembly compileerror object, which indicates an error during
webassembly decoding or validation.
... syntax new
webassembly.compileerror(message, filename, linenumber) parameters message optional human-readable description of the error.
... examples creating a new compileerror instance the following snippet creates a new compileerror instance, and logs its details to the console: try { throw new
webassembly.compileerror('hello', 'somefile', 10); } catch (e) { console.log(e instanceof compileerror); // true console.log(e.message); // "hello" console.log(e.name); // "compileerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifica...
...tions specification
webassembly javascript interfacethe definition of '
webassembly constructors' in that specification.
WebAssembly.LinkError() constructor - JavaScript
the
webassembly.linkerror() constructor creates a new
webassembly linkerror object, which indicates an error during module instantiation (besides traps from the start function).
... syntax new
webassembly.linkerror(message, filename, linenumber) parameters message optional human-readable description of the error.
... examples creating a new linkerror instance the following snippet creates a new linkerror instance, and logs its details to the console: try { throw new
webassembly.linkerror('hello', 'somefile', 10); } catch (e) { console.log(e instanceof linkerror); // true console.log(e.message); // "hello" console.log(e.name); // "linkerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications ...
... specification
webassembly javascript interfacethe definition of 'linkerror' in that specification.
WebAssembly.Module.imports() - JavaScript
the
webassembly.imports() function returns an array containing descriptions of all the declared imports of the given module.
... syntax
webassembly.module.imports(module); parameters module a
webassembly.module object.
... exceptions if module is not a
webassembly.module object instance, a typeerror is thrown.
...
webassembly.compilestreaming(fetch('simple.wasm')) .then(function(mod) { var imports =
webassembly.module.imports(mod); console.log(imports[0]); }); the output looks like this: { module: "imports", name: "imported_func", kind: "function" } specifications specification
webassembly javascript interfacethe definition of 'imports()' in that specification.
WebAssembly.RuntimeError() constructor - JavaScript
the
webassembly.runtimeerror() constructor creates a new
webassembly runtimeerror object — the type that is thrown whenever
webassembly specifies a trap.
... syntax new
webassembly.runtimeerror(message, filename, linenumber) parameters message optional human-readable description of the error.
... examples creating a new runtimeerror instance the following snippet creates a new runtimeerror instance, and logs its details to the console: try { throw new
webassembly.runtimeerror('hello', 'somefile', 10); } catch (e) { console.log(e instanceof runtimeerror); // true console.log(e.message); // "hello" console.log(e.name); // "runtimeerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifica...
...tions specification
webassembly javascript interfacethe definition of '
webassembly.runtimeerror constructor' in that specification.
WebAssembly.validate() - JavaScript
the
webassembly.validate() function validates a given typed array of
webassembly binary code, returning whether the bytes form a valid wasm module (true) or not (false).
... syntax
webassembly.validate(buffersource); parameters buffersource a typed array or arraybuffer containing
webassembly binary code to be validated.
... fetch('simple.wasm').then(response => response.arraybuffer() ).then(function(bytes) { var valid =
webassembly.validate(bytes); console.log("the given bytes are " + (valid ?
... "" : "not ") + "a valid wasm module"); }); specifications specification
webassembly javascript interfacethe definition of 'validate()' in that specification.
WebAssembly.Memory.prototype.buffer - JavaScript
the buffer prototype property of the
webassembly.memory object returns the buffer contained in the memory.
... examples using buffer the following example (see memory.html on github, and view it live also) fetches and instantiates the loaded memory.wasm byte code using the
webassembly.instantiatestreaming() method, while importing the memory created in the line above.
...
webassembly.instantiatestreaming(fetch('memory.wasm'), { js: { mem: memory } }) .then(obj => { var i32 = new uint32array(memory.buffer); for (var i = 0; i < 10; i++) { i32[i] = i; } var sum = obj.instance.exports.accumulate(0, 10); console.log(sum); }); specifications specification
webassembly javascript interfacethe definition of 'buffer' in that specification.
WebAssembly.Table.prototype.grow() - JavaScript
the grow() prototype method of the
webassembly.table object increases the size of the table instance by a specified number of elements.
... examples using grow the following example creates a new
webassembly table instance with an initial size of 2 and a maximum size of 10.
... var table = new
webassembly.table({ element: "anyfunc", initial: 2, maximum: 10 }); you can then grow the table by 1 with the following: console.log(table.length); // "2" console.log(table.grow(1)); // "2" console.log(table.length); // "3" specifications specification
webassembly javascript interfacethe definition of 'grow()' in that specification.
WebAssembly.Table.prototype.length - JavaScript
the length prototype property of the
webassembly.table object returns the length of the table, i.e.
... syntax table.length; examples using length the following example creates a new
webassembly table instance with an initial size of 2 and a maximum size of 10.
... var table = new
webassembly.table({ element: "anyfunc", initial: 2, maximum: 10 }); you can then grow the table by 1 with the following: console.log(table.length); // "2" console.log(table.grow(1)); // "2" console.log(table.length); // "3" specifications specification
webassembly javascript interfacethe definition of 'length' in that specification.
Debugger.Script - Firefox Developer Tools
debugger.script a debugger.script instance may refer to a sequence of bytecode in the debuggee or to a block of
webassembly code.
... debugger.script for
webassembly for debugger.script instances referring to a block of
webassembly code, they are distinguished by their format property being "wasm".
... currently only entire modules evaluated via new
webassembly.module are represented.
...And 18 more matches
Debugger.Source - Firefox Developer Tools
debugger.source a debugger.source instance represents either a piece of javascript source code or the serialized text of a block of
webassembly code.
... debugger.source for
webassembly for a debugger.source instance representing the serialized text of a block of
webassembly code, its properties provide the serialized text as a string.
... currently only entire modules evaluated via new
webassembly.module are represented.
...And 10 more matches
Planned changes to shared memory - JavaScript
webassembly.memory can still be used to get an instance.
...
webassembly shared memory the
webassembly threads proposal allows
webassembly.memory objects to be created with a new shared constructor flag.
...therefore, the requirements listed above for sharing a sharedarraybuffer between workers also apply to sharing a
webassembly.memory.
...And 2 more matches
Shell global objects
wasmissupported() returns a boolean indicating whether
webassembly is supported on the current device.
... wasmbinarytotext(bin) translates binary encoding to text format wasmextractcode(module) extracts generated machine code from
webassembly.module.
Debugger - Firefox Developer Tools
allowwasmbinarysource a boolean value indicating whether
webassembly sources will be available in binary form.
... the
webassembly text generation will be disabled.
Index - Firefox Developer Tools
23 debugger.script a debugger.script instance may refer to a sequence of bytecode in the debuggee or to a block of
webassembly code.
... 24 debugger.source a debugger.source instance represents either a piece of javascript source code or the serialized text of a block of
webassembly code.
Background audio processing using AudioWorklet - Web APIs
it's worth noting that because audio processing can often involve substantial computation, your processor may benefit greatly from being built using
webassembly, which brings near-native or fully native performance to web apps.
... implementing your audio processing algorithm using
webassembly can make it perform markedly better.
Examples - Game development
pyramid solitaire ancient egypt pyramid solitaire app ported to
webassembly with emscripten assorted demos wavegl webgl visualizer for sound sources.
MDN Web Docs Glossary: Definitions of Web-related terms
unicode uri url urn usenet user agent utf-8 ux v validator value variable vendor prefix viewport visual viewport voip w w3c wai wcag web performance web server web standards
webassembly webdav webextensions webgl webidl webkit webm webp webrtc websockets webvtt whatwg whitespace world wide web wrapper x xforms xhr (xmlhttprequest) xhtml xinclude xlink xml xpath xquery ...
Future directions
we would also like to allow
webassembly to interact with gc-managed data.
WebReplayRoadmap
media elements (bug 1304146) web audio (bug 1304147) webrtc (bug 1304149)
webassembly (bug 1481007) webgl (bug 1506467) support more operating systems (not yet implemented) only macos is supported right now.
Web Audio API - Web APIs
audio processing in javascript using audio worklets, you can define custom audio nodes written in javascript or
webassembly.
Worklet - Web APIs
with worklets, you can run javascript and
webassembly code to do graphics rendering or audio processing where high performance is required.
Standard built-in objects - JavaScript
intl intl.collator intl.datetimeformat intl.listformat intl.numberformat intl.pluralrules intl.relativetimeformat intl.locale
webassembly webassembly webassembly.module
webassembly.instance
webassembly.memory
webassembly.table
webassembly.compileerror
webassembly.linkerror
webassembly.runtimeerror other arguments ...
JavaScript reference - JavaScript
structured data arraybuffer sharedarraybuffer atomics dataview json control abstraction promise generator generatorfunction asyncfunction reflection reflect proxy internationalization intl intl.collator intl.datetimeformat intl.displaynames intl.listformat intl.locale intl.numberformat intl.pluralrules intl.relativetimeformat
webassembly webassembly webassembly.module
webassembly.instance
webassembly.memory
webassembly.table
webassembly.compileerror
webassembly.linkerror
webassembly.runtimeerror statements javascript statements and declarations control flowblock break continue empty if...else switch throw try...catch declarations var let const functions and classes funct...