binaryen
Advanced tools
JavaScript version 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
var binaryen = require("binaryen");
// Create a module with a single function
var myModule = new binaryen.Module();
myModule.addFunction("add", myModule.addFunctionType("iii", binaryen.i32, [ binaryen.i32, binaryen.i32 ]), [ binaryen.i32 ],
myModule.block(null, [
myModule.setLocal(2,
myModule.i32.add(
myModule.getLocal(0, binaryen.i32),
myModule.getLocal(1, binaryen.i32)
)
),
myModule.return(
myModule.getLocal(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.
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.
auto: Type
Special type used in Module#block exclusively. Lets the API figure out a block's result type automatically.
unreachable: Type
Special type indicating unreachable code when obtaining information about an expression.
new Module(): 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#addFunctionType(name: string, resultType: Type, paramTypes: Type[]): Signature
Adds a new function type.
Module#getFunctionTypeBySignature(resultType: Type, paramTypes: Type[]): Signature
Gets an existing function type by its parametric signature. Returns 0 if there is no such function type.
Module#addFunction(name: string, functionType: Signature, varTypes: Type[], body: Expression): Function
Adds a function. varTypes indicate additional locals, in the given order.
Module#getFunction(name: string): Function
Gets a function, by name,
Module#removeFunction(name: string): void
Removes a function, by name.
Module#addFunctionImport(internalName: string, externalModuleName: string, externalBaseName: string, functionType: Signature): Import
Adds a function import.
Module#addTableImport(internalName: string, externalModuleName: string, externalBaseName: string): Import
Adds a table import. There's just one table for now, using name "0".
Module#addMemoryImport(internalName: string, externalModuleName: string, externalBaseName: string): Import
Adds a memory import. There's just one memory for now, using name "0".
Module#addGlobalImport(internalName: string, externalModuleName: string, externalBaseName: string, globalType: Type): Import
Adds a global variable import. Imported globals must be immutable.
Module#removeImport(internalName: string): void
Removes an import, by internal name.
Module#addFunctionExport(internalName: string, externalName: string): Export
Adds a function export.
Module#addTableExport(internalName: string, externalName: string): Export
Adds a table export. There's just one table for now, using name "0".
Module#addMemoryExport(internalName: string, externalName: string): Export
Adds a memory export. There's just one memory for now, using name "0".
Module#addGlobalExport(internalName: string, externalName: string): Export
Adds a global variable export. Exported globals must be immutable.
Module#removeExport(externalName: string): void
Removes an export, by external name.
Module#setFunctionTable(funcs: Function[]): void
Sets the contents of the function table. There's just one table for now, using name "0".
Module#setMemory(initial: number, maximum: number, exportName: string | null, segments: MemorySegment[]): void
Sets the memory. There's just one memory for now, using name "0". Providing exportName also creates a memory export.
Module#setStart(start: Function): void
Sets the start function.
Module#autoDrop(): void
Enables automatic insertion of drop operations where needed. Lets you not worry about dropping when creating your code.
getFunctionTypeInfo(ftype: FunctionType: FunctionTypeInfo
Obtains information about a function type.
string | nullType[]TypegetFunctionInfo(ftype: Function: FunctionInfo
Obtains information about a function.
string | nullFunctionTypeType[]TypeTypeExpressiongetImportInfo(import_: Import): ImportInfo
Obtains information about an import, always including:
ExternalKindstringstringstringAdditional properties depend on the expression's kind and are usually equivalent to the respective parameters when creating such an import:
TypeFunctionTypePossible ExternalKind values are:
ExternalKindExternalKindExternalKindExternalKindgetExportInfo(export_: Export): ExportInfo
Obtains information about an export.
ExternalKindstringstringbooleantrue if valid, otherwise prints validation errors and returns false.Module#optimize(): void
Optimizes the module using the default optimization passes.
Module#optimizeFunction(func: Function | 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: Function | 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.
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#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: Expression[], resultType?: Type): Expression
Creates a block. resultType defaults to none.
Module#if(condition: Expression, ifTrue: Expression, ifFalse?: Expression): Expression
Creates an if or if/else combination.
Module#loop(label: string | null, body: Expression): Expression
Creates a loop.
Module#break(label: string, condition?: Expression, value?: Expression): Expression
Creates a break (br) to a label.
Module#switch(labels: string[], defaultLabel: string, condition: Expression, value?: Expression): Expression
Creates a switch (br_table).
Module#nop(): Expression
Creates a no-operation (nop) instruction.
Module#return(value?: Expression): Expression
Creates a return.
Module#unreachable(): Expression
Creates an unreachable instruction that will always trap.
Module#drop(value: Expression): Expression
Creates a drop of a value.
Module#select(condition: Expression, ifTrue: Expression, ifFalse: Expression): Expression
Creates a select of one of two values.
number): Expressionnumber, high: number): Expressionnumber): Expressionnumber): Expressionnumber): Expressionnumber, high: number): ExpressionModule#getLocal/get_local(index: number, type: Type): Expression
Creates a get_local for the local at the specified index. Note that we must specify the type here as we may not have created the local being called yet.
Module#setLocal/set_local(index: number, value: Expression): Expression
Creates a set_local for the local at the specified index.
Module#teeLocal/tee_local(index: number, value: Expression): Expression
Creates a tee_local for the local at the specified index. A tee differs from a set in that the value remains on the stack.
Module#getGlobal/get_global(name: string, type: Type): Expression
Creates a get_global for the global with the specified name. Note that we must specify the type here as we may not have created the global being called yet.
Module#setGlobal/set_global(name: string, value: Expression): Expression
Creates a set_global 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#callImport/call_import(name: string, operands: Expression[], returnType: Type): Expression
Similar to call, but calls an imported function.
Module#callIndirect/call_indirect(target: Expression, operands: Expression[], returnType: Type): Expression
Similar to call, but calls indirectly, i.e., via a function pointer, so an expression replaces the name as the called value.
number, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression, value: Expression): Expressionnumber, align: number, ptr: Expression, value: Expression): Expressionnumber, align: number, ptr: Expression, value: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression, value: Expression): Expressionnumber, align: number, ptr: Expression, value: Expression): Expressionnumber, align: number, ptr: Expression, value: Expression): Expressionnumber, align: number, ptr: Expression, value: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression, value: Expression): Expressionnumber, align: number, ptr: Expression): Expressionnumber, align: number, ptr: Expression, value: Expression): ExpressionExpressionnumber): Expressionstring): Expression 🦄number, ptr: Expression): Expressionnumber, ptr: Expression): Expressionnumber, ptr: Expression): Expressionnumber, ptr: Expression, value: Expression): Expressionnumber, ptr: Expression, value: Expression): Expressionnumber, ptr: Expression, value: Expression): Expressionnumber, ptr: Expression): Expressionnumber, ptr: Expression): Expressionnumber, ptr: Expression): Expressionnumber, ptr: Expression): Expressionnumber, ptr: Expression, value: Expression): Expressionnumber, ptr: Expression, value: Expression): Expressionnumber, ptr: Expression, value: Expression): Expressionnumber, ptr: 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Expression): ExpressionExpression, expected: Expression, timeout: Expression): ExpressionExpression, wakeCount: Expression): ExpressiongetExpressionId(expr: Expression): ExpressionId
Gets the id (kind) of the specified expression. Possible values are:
ExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdExpressionIdgetExpressionType(expr: Expression): Type
Gets the type of the specified expression.
getExpressionInfo(expr: Expression: 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:
stringExpression[]ExpressionExpressionExpression | nullstringExpressionstringExpression | nullExpression | nullstring[]string | nullExpressionExpression | nullstringExpression[]stringExpression[]ExpressionExpression[]numberbooleannumberExpressionstringstringExpressionbooleanbooleannumbernumbernumberExpressionbooleannumbernumbernumberExpressionExpressionnumber | { low: number, high: number }numberExpressionnumberExpressionExpressionExpressionExpressionExpressionExpressionExpression | nullnumberstring | nullExpression[]numbernumbernumberExpressionExpressionnumbernumberExpressionExpressionExpressionExpressionExpressionExpressionTypeExpressionExpressionNopInfo and UnreachableInfo do not include any additional properties.
new Relooper(): Relooper
Constructs a relooper instance. This lets you provide an arbitrary CFG, and the relooper will structure it for WebAssembly.
Relooper#addBlock(code: Expression): RelooperBlock
Adds a new block to the CFG, containing the provided code as its body.
Relooper#addBranch(from: RelooperBlock, to: RelooperBlock, condition: Expression, code: Expression): 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: Expression, condition: Expression): RelooperBlock
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: RelooperBlock, to: RelooperBlock, indexes: number[], code: Expression): 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: RelooperBlock, labelHelper: number, module: Module): Expression
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: Function, expr: Expression, fileIndex: number, lineNumber: number, columnNumber: number): void
Sets the debug location of the specified Expression within the specified Function.
Module#setAPITracing(on: boolean): void
Enables tracing of the C-API in the console. Can be very useful when filing bug reports.
Module#interpret(): void
Runs the module in the interpreter, calling the start function.
Clone the GitHub repository including submodules and install the development dependencies:
$> git clone --recursive https://github.com/AssemblyScript/binaryen.js.git
$> cd binaryen.js
$> npm install
Make sure Emscripten is properly set up on your system.
Afterwards, to build the binaryen submodule to index.js, run:
$> npm run build
To run the tests, do:
$> npm test
FAQs
Browser & Node.js builds of Binaryen, a compiler infrastructure and toolchain library for WebAssembly.
The npm package binaryen receives a total of 56,353 weekly downloads. As such, binaryen popularity was classified as popular.
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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