WebAssembly Parser

An AssemblyScript example. A WebAssembly binary parser in WebAssembly. Small, fast, with TypeScript support.

API

parse(binary: Uint8Array, options?: ParseOptions): void
Parses the contents of a WebAssembly binary according to the specified options.
ParseOptions
Options specified to the parser. The onSection callback determines the sections being evaluated in detail.
- onSection?(id: SectionId, payloadOff: number, payloadLen: number, nameOff: number, nameLen: number): boolean
  Called with each section in the binary. Returning true evaluates the section.
- onType?(index: number, form: number): void
  Called with each function type if the type section is evaluated.
- onTypeParam?(index: number, paramIndex: number, paramType: Type): void
  Called with each function parameter if the type section is evaluated.
- onTypeReturn?(index: number, returnIndex: number, returnType: Type): void
  Called with each function return type if the type section is evaluated.
- onImport?(index: number, kind: ExternalKind, moduleOff: number, moduleLen: number, fieldOff: number, fieldLen: number): void
  Called with each import if the import section is evaluated.
- onFunctionImport?(index: number, type: number): void
  Called with each function import if the import section is evaluated.
- onTableImport?(index: number, type: Type, initial: number, maximum: number, flags: number): void
  Called with each table import if the import section is evaluated.
- onMemoryImport?(index: number, initial: number, maximum: number, flags: number): void
  Called with each memory import if the import section is evaluated.
- onGlobalImport?(index: number, type: Type, mutability: number): void
  Called with each global import if the import section is evaluated.
- onMemory?(index: number, initial: number, maximum: number, flags: number): void
  Called with each memory if the memory section is evaluated.
- onFunction?(index: number, typeIndex: number): void
  Called with each function if the function section is evaluated.
- onGlobal?(index: number, type: Type, mutability: number): void
  Called with each global if the global section is evaluated.
- onStart?(index: number): void
  Called with the start function index if the start section is evaluated.
- onExport?(index: number, kind: ExternalKind, kindIndex: number, nameOff: number, nameLen: number): void
  Called with each export if the export section is evaluated.
- onSourceMappingURL?(offset: number, length: number): void
  Called with the source map URL if the 'sourceMappingURL' section is evaluated.
- onModuleName?(offset: number, length: number): void
  Called with the module name if present and the 'name' section is evaluated.
- onFunctionName?(index: number, offset: number, length: number): void
  Called with each function name if present and the 'name' section is evaluated.
- onLocalName?(funcIndex: number, index: number, offset: number, length: number): void
  Called with each local name if present and the 'name' section is evaluated.
Type
A value or element type, depending on context.

Name Value

i32 0x7f

i64 0x7e

f32 0x7d

f64 0x7c

anyfunc 0x70

func 0x60

none 0x40
SectionId
Numerical id of the current section.

Name Value

Custom 0

Type 1

Import 2

Function 3

Table 4

Memory 5

Global 6

Export 7

Start 8

Element 9

Code 10

Data 11
ExternalKind
Kind of an export or import.

Name Value

Function 0

Table 1

Memory 2

Global 3

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