binaryen
Advanced tools
Browser & Node.js builds of Binaryen, a compiler infrastructure and toolchain library for WebAssembly.
binaryen.js is a port of Binaryen to the Web, allowing you to generate WebAssembly using a JavaScript API.
$> npm install binaryen
import binaryen from "binaryen";
// Create a module with a single function
var myModule = new binaryen.Module();
myModule.addFunction("add", binaryen.createType([ binaryen.i32, binaryen.i32 ]), binaryen.i32, [ binaryen.i32 ],
myModule.block(null, [
myModule.local.set(2,
myModule.i32.add(
myModule.local.get(0, binaryen.i32),
myModule.local.get(1, binaryen.i32)
)
),
myModule.return(
myModule.local.get(2, binaryen.i32)
)
])
);
myModule.addFunctionExport("add", "add");
// Optimize the module using default passes and levels
myModule.optimize();
// Validate the module
if (!myModule.validate())
throw new Error("validation error");
// Generate text format and binary
var textData = myModule.emitText();
var wasmData = myModule.emitBinary();
// Example usage with the WebAssembly API
var compiled = new WebAssembly.Module(wasmData);
var instance = new WebAssembly.Instance(compiled, {});
console.log(instance.exports.add(41, 1));
The buildbot also publishes nightly versions once a day if there have been changes. The latest nightly can be installed through
$> npm install binaryen@nightly
or you can use one of the previous versions instead if necessary.
https://cdn.jsdelivr.net/gh/AssemblyScript/binaryen.js@VERSION/index.jshttps://cdn.jsdelivr.net/npm/binaryen@VERSION/index.jshttps://unpkg.com/binaryen@VERSION/index.jsReplace VERSION with a specific version or omit it (not recommended in production) to use main/latest.
The package includes Node.js builds of Binaryen's command line tools: wasm-shell, wasm-opt, wasm-metadce, wasm2js, wasm-as, wasm-dis, wasm-ctor-eval, wasm-reduce and wasm-merge.
Please note that the Binaryen API is evolving fast and that definitions and documentation provided by the package tend to get out of sync despite our best efforts. It's a bot after all. If you rely on binaryen.js and spot an issue, please consider sending a PR our way by updating index.d.ts and README.md to reflect the current API.
Future features 🦄 might not be supported by all runtimes.
none: Type
The none type, e.g., void.
i32: Type
32-bit integer type.
i64: Type
64-bit integer type.
f32: Type
32-bit float type.
f64: Type
64-bit float (double) type.
v128: Type
128-bit vector type. 🦄
funcref: Type
A function reference. 🦄
externref: Type
An external (host) reference. 🦄
anyref: Type
Any (top type) reference. 🦄
eqref: Type
Equal reference. 🦄
i31ref: Type
i31 reference. 🦄
structref: Type
Structure reference. 🦄
stringref: Type
String reference. 🦄
stringview_wtf8: Type
View of a string reference in WTF-8 encoding. 🦄
stringview_wtf16: Type
View of a string reference in WTF-16 encoding. 🦄
stringview_iter: Type
Iterator over the code points of a string reference. 🦄
unreachable: Type
Special type indicating unreachable code when obtaining information about an expression.
auto: Type
Special type used in Module#block exclusively. Lets the API figure out a block's result type automatically.
createType(types: Type[]): Type
Creates a multi-value type from an array of types.
expandType(type: Type): Type[]
Expands a multi-value type to an array of types.
new Module()
Constructs a new module.
parseText(text: string): Module
Creates a module from Binaryen's s-expression text format (not official stack-style text format).
readBinary(data: Uint8Array): Module
Creates a module from binary data.
Module#addFunction(name: string, params: Type, results: Type, vars: Type[], body: ExpressionRef): FunctionRef
Adds a function. vars indicate additional locals, in the given order.
Module#getFunction(name: string): FunctionRef
Gets a function, by name,
Module#removeFunction(name: string): void
Removes a function, by name.
Module#getNumFunctions(): number
Gets the number of functions within the module.
Module#getFunctionByIndex(index: number): FunctionRef
Gets the function at the specified index.
Module#addFunctionImport(internalName: string, externalModuleName: string, externalBaseName: string, params: Type, results: Type): void
Adds a function import.
Module#addTableImport(internalName: string, externalModuleName: string, externalBaseName: string): void
Adds a table import. There's just one table for now, using name "0".
Module#addMemoryImport(internalName: string, externalModuleName: string, externalBaseName: string): void
Adds a memory import. There's just one memory for now, using name "0".
Module#addGlobalImport(internalName: string, externalModuleName: string, externalBaseName: string, globalType: Type): void
Adds a global variable import. Imported globals must be immutable.
Module#addFunctionExport(internalName: string, externalName: string): ExportRef
Adds a function export.
Module#addTableExport(internalName: string, externalName: string): ExportRef
Adds a table export. There's just one table for now, using name "0".
Module#addMemoryExport(internalName: string, externalName: string): ExportRef
Adds a memory export. There's just one memory for now, using name "0".
Module#addGlobalExport(internalName: string, externalName: string): ExportRef
Adds a global variable export. Exported globals must be immutable.
Module#getNumExports(): number
Gets the number of exports witin the module.
Module#getExportByIndex(index: number): ExportRef
Gets the export at the specified index.
Module#removeExport(externalName: string): void
Removes an export, by external name.
Module#addGlobal(name: string, type: Type, mutable: number, value: ExpressionRef): GlobalRef
Adds a global instance variable.
Module#getGlobal(name: string): GlobalRef
Gets a global, by name,
Module#removeGlobal(name: string): void
Removes a global, by name.
Module#setMemory(initial: number, maximum: number, exportName: string | null, segments: MemorySegment[], shared?: boolean): void
Sets the memory. There's just one memory for now, using name "0". Providing exportName also creates a memory export.
ExpressionRefUint8ArraybooleanModule#getNumMemorySegments(): number
Gets the number of memory segments within the module.
Module#getMemorySegmentInfoByIndex(index: number): MemorySegmentInfo
Gets information about the memory segment at the specified index.
numberUint8ArraybooleanModule#setStart(start: FunctionRef): void
Sets the start function.
Module#getFeatures(): Features
Gets the WebAssembly features enabled for this module.
Note that the return value may be a bitmask indicating multiple features. Possible feature flags are:
FeaturesFeaturesFeaturesFeaturesFeaturesFeaturesFeaturesFeaturesFeaturesFeaturesFeaturesFeaturesModule#setFeatures(features: Features): void
Sets the WebAssembly features enabled for this module.
Module#addCustomSection(name: string, contents: Uint8Array): void
Adds a custom section to the binary.
Module#autoDrop(): void
Enables automatic insertion of drop operations where needed. Lets you not worry about dropping when creating your code.
getFunctionInfo(ftype: FunctionRef: FunctionInfo
Obtains information about a function.
stringstring | null (if imported)string | null (if imported)TypeTypeTypeExpressionRefgetGlobalInfo(global: GlobalRef): GlobalInfo
Obtains information about a global.
stringstring | null (if imported)string | null (if imported)TypebooleanExpressionRefgetTableInfo(table: TableRef): TableInfo
Obtains information about a table.
stringstring | null (if imported)string | null (if imported)number;number;getExportInfo(export_: ExportRef): ExportInfo
Obtains information about an export.
ExternalKindstringstringPossible ExternalKind values are:
ExternalKindExternalKindExternalKindExternalKindExternalKindgetTagInfo(tag: TagRef): TagInfo
Obtains information about a tag.
stringstring | null (if imported)string | null (if imported)TypeTypegetSideEffects(expr: ExpressionRef, features: FeatureFlags): SideEffects
Gets the side effects of the specified expression.
SideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsSideEffectsbooleantrue if valid, otherwise prints validation errors and returns false.Module#optimize(): void
Optimizes the module using the default optimization passes.
Module#optimizeFunction(func: FunctionRef | string): void
Optimizes a single function using the default optimization passes.
Module#runPasses(passes: string[]): void
Runs the specified passes on the module.
Module#runPassesOnFunction(func: FunctionRef | string, passes: string[]): void
Runs the specified passes on a single function.
getOptimizeLevel(): number
Gets the currently set optimize level. 0, 1, 2 correspond to -O0, -O1, -O2 (default), etc.
setOptimizeLevel(level: number): void
Sets the optimization level to use. 0, 1, 2 correspond to -O0, -O1, -O2 (default), etc.
getShrinkLevel(): number
Gets the currently set shrink level. 0, 1, 2 correspond to -O0, -Os (default), -Oz.
setShrinkLevel(level: number): void
Sets the shrink level to use. 0, 1, 2 correspond to -O0, -Os (default), -Oz.
getDebugInfo(): boolean
Gets whether generating debug information is currently enabled or not.
setDebugInfo(on: boolean): void
Enables or disables debug information in emitted binaries.
getLowMemoryUnused(): boolean
Gets whether the low 1K of memory can be considered unused when optimizing.
setLowMemoryUnused(on: boolean): void
Enables or disables whether the low 1K of memory can be considered unused when optimizing.
getPassArgument(key: string): string | null
Gets the value of the specified arbitrary pass argument.
setPassArgument(key: string, value: string | null): void
Sets the value of the specified arbitrary pass argument. Removes the respective argument if value is null.
clearPassArguments(): void
Clears all arbitrary pass arguments.
getAlwaysInlineMaxSize(): number
Gets the function size at which we always inline.
setAlwaysInlineMaxSize(size: number): void
Sets the function size at which we always inline.
getFlexibleInlineMaxSize(): number
Gets the function size which we inline when functions are lightweight.
setFlexibleInlineMaxSize(size: number): void
Sets the function size which we inline when functions are lightweight.
getOneCallerInlineMaxSize(): number
Gets the function size which we inline when there is only one caller.
setOneCallerInlineMaxSize(size: number): void
Sets the function size which we inline when there is only one caller.
Module#emitBinary(): Uint8Array
Returns the module in binary format.
Module#emitBinary(sourceMapUrl: string | null): BinaryWithSourceMap
Returns the module in binary format with its source map. If sourceMapUrl is null, source map generation is skipped.
Uint8Arraystring | nullModule#emitText(): string
Returns the module in Binaryen's s-expression text format (not official stack-style text format).
Module#emitStackIR(optimize?: boolean): string
Returns the module in official stack-style text format.
Module#emitAsmjs(): string
Returns the asm.js representation of the module.
Module#dispose(): void
Releases the resources held by the module once it isn't needed anymore.
Module#block(label: string | null, children: ExpressionRef[], resultType?: Type): ExpressionRef
Creates a block. resultType defaults to none.
Module#if(condition: ExpressionRef, ifTrue: ExpressionRef, ifFalse?: ExpressionRef): ExpressionRef
Creates an if or if/else combination.
Module#loop(label: string | null, body: ExpressionRef): ExpressionRef
Creates a loop.
Module#br(label: string, condition?: ExpressionRef, value?: ExpressionRef): ExpressionRef
Creates a branch (br) to a label.
Module#switch(labels: string[], defaultLabel: string, condition: ExpressionRef, value?: ExpressionRef): ExpressionRef
Creates a switch (br_table).
Module#nop(): ExpressionRef
Creates a no-operation (nop) instruction.
Module#return(value?: ExpressionRef): ExpressionRef
Creates a return.
Module#unreachable(): ExpressionRef
Creates an unreachable instruction that will always trap.
Module#drop(value: ExpressionRef): ExpressionRef
Creates a drop of a value.
Module#select(condition: ExpressionRef, ifTrue: ExpressionRef, ifFalse: ExpressionRef, type?: Type): ExpressionRef
Creates a select of one of two values.
Module#local.get(index: number, type: Type): ExpressionRef
Creates a local.get for the local at the specified index. Note that we must specify the type here as we may not have created the local being accessed yet.
Module#local.set(index: number, value: ExpressionRef): ExpressionRef
Creates a local.set for the local at the specified index.
Module#local.tee(index: number, value: ExpressionRef, type: Type): ExpressionRef
Creates a local.tee for the local at the specified index. A tee differs from a set in that the value remains on the stack. Note that we must specify the type here as we may not have created the local being accessed yet.
Module#global.get(name: string, type: Type): ExpressionRef
Creates a global.get for the global with the specified name. Note that we must specify the type here as we may not have created the global being accessed yet.
Module#global.set(name: string, value: ExpressionRef): ExpressionRef
Creates a global.set for the global with the specified name.
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Creates a call to a function. Note that we must specify the return type here as we may not have created the function being called yet.
Module#return_call(name: string, operands: ExpressionRef[], returnType: Type): ExpressionRef
Like call, but creates a tail-call. 🦄
Module#call_indirect(target: ExpressionRef, operands: ExpressionRef[], params: Type, results: Type): ExpressionRef
Similar to call, but calls indirectly, i.e., via a function pointer, so an expression replaces the name as the called value.
Module#return_call_indirect(target: ExpressionRef, operands: ExpressionRef[], params: Type, results: Type): ExpressionRef
Like call_indirect, but creates a tail-call. 🦄
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ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, expected: ExpressionRef, replacement: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, expected: ExpressionRef, replacement: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, value: ExpressionRef): ExpressionRefnumber, ptr: ExpressionRef, expected: ExpressionRef, replacement: ExpressionRef): ExpressionRefExpressionRef, expected: ExpressionRef, timeout: ExpressionRef): ExpressionRefExpressionRef, expected: ExpressionRef, timeout: ExpressionRef): ExpressionRefExpressionRef, notifyCount: ExpressionRef): ExpressionRefExpressionRefExpressionRef): ExpressionRefExpressionRef): ExpressionRefExpressionRef): ExpressionRefExpressionRef): ExpressionRefExpressionRef): ExpressionRefNote that these are pseudo instructions enabling Binaryen to reason about multiple values on the stack.
ExpressionRef): ExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefExpressionRef[]): ExpressionRefExpressionRef, index: number): ExpressionRefstring, body: ExpressionRef, catchTags: string[], catchBodies: ExpressionRef[], delegateTarget?: string): ExpressionRefstring, operands: ExpressionRef[]): ExpressionRefstring): ExpressionRefstring, params: Type, results: Type): TagRefstring): TagRefstirng): voidstring, externalModuleName: string, externalBaseName: string, params: Type, results: Type): voidstring, externalName: string): ExportRefExpressionRefExpressionRef): ExpressionRefstring): ExpressionRefstring, dest: ExpressionRef, offset: ExpressionRef, size: ExpressionRef): ExpressionRefExpressionRef, source: ExpressionRef, size: ExpressionRef): ExpressionRefExpressionRef, value: ExpressionRef, size: ExpressionRef): ExpressionRefstring): ExpressionRefgetExpressionId(expr: ExpressionRef): ExpressionId
Gets the id (kind) of the specified expression. Possible values are:
ExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdgetExpressionType(expr: ExpressionRef): Type
Gets the type of the specified expression.
getExpressionInfo(expr: ExpressionRef): ExpressionInfo
Obtains information about an expression, always including:
ExpressionIdTypeAdditional properties depend on the expression's id and are usually equivalent to the respective parameters when creating such an expression:
stringExpressionRef[]ExpressionRefExpressionRefExpressionRef | nullstringExpressionRefstringExpressionRef | nullExpressionRef | nullstring[]string | nullExpressionRefExpressionRef | nullstringExpressionRef[]stringExpressionRef[]ExpressionRefExpressionRef[]numberbooleannumberExpressionRefstringstringExpressionRefbooleanbooleannumbernumbernumberExpressionRefbooleannumbernumbernumberExpressionRefExpressionRefnumber | { low: number, high: number }numberExpressionRefnumberExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefExpressionRef | nullExpressionRefnumbernumbernumberExpressionRefExpressionRefnumbernumberExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefTypeExpressionRefExpressionRefOpExpressionRefExpressionRefOpExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefUint8ArrayOpExpressionRefExpressionRefExpressionRefOpExpressionRefExpressionRefOpnumbernumberExpressionRefnumberExpressionRefExpressionRefExpressionRefnumberExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefExpressionRefOperationsExpressionRefOperationsExpressionRefstringExpressionRefExpressionRefstringExpressionRefExpressionRef[]ExpressionRef[];boolean;string;boolean;stringExpressionRef[]stringExpressionRef[]ExpressionRefnumberExpressionRefExpressionRefbooleanExpressionRefemitText(expression: ExpressionRef): string
Emits the expression in Binaryen's s-expression text format (not official stack-style text format).
copyExpression(expression: ExpressionRef): ExpressionRef
Creates a deep copy of an expression.
new Relooper()
Constructs a relooper instance. This lets you provide an arbitrary CFG, and the relooper will structure it for WebAssembly.
Relooper#addBlock(code: ExpressionRef): RelooperBlockRef
Adds a new block to the CFG, containing the provided code as its body.
Relooper#addBranch(from: RelooperBlockRef, to: RelooperBlockRef, condition: ExpressionRef, code: ExpressionRef): void
Adds a branch from a block to another block, with a condition (or nothing, if this is the default branch to take from the origin - each block must have one such branch), and optional code to execute on the branch (useful for phis).
Relooper#addBlockWithSwitch(code: ExpressionRef, condition: ExpressionRef): RelooperBlockRef
Adds a new block, which ends with a switch/br_table, with provided code and condition (that determines where we go in the switch).
Relooper#addBranchForSwitch(from: RelooperBlockRef, to: RelooperBlockRef, indexes: number[], code: ExpressionRef): void
Adds a branch from a block ending in a switch, to another block, using an array of indexes that determine where to go, and optional code to execute on the branch.
Relooper#renderAndDispose(entry: RelooperBlockRef, labelHelper: number, module: Module): ExpressionRef
Renders and cleans up the Relooper instance. Call this after you have created all the blocks and branches, giving it the entry block (where control flow begins), a label helper variable (an index of a local we can use, necessary for irreducible control flow), and the module. This returns an expression - normal WebAssembly code - that you can use normally anywhere.
Module#addDebugInfoFileName(filename: string): number
Adds a debug info file name to the module and returns its index.
Module#getDebugInfoFileName(index: number): string | null
Gets the name of the debug info file at the specified index.
Module#setDebugLocation(func: FunctionRef, expr: ExpressionRef, fileIndex: number, lineNumber: number, columnNumber: number): void
Sets the debug location of the specified ExpressionRef within the specified FunctionRef.
voidFAQs
Browser & Node.js builds of Binaryen, a compiler infrastructure and toolchain library for WebAssembly.
We found that binaryen demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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