Ubuntu Manpage: wasmedge - standalone runtime for WebAssembly

Provided by: wasmedge_0.13.5+dfsg-1build4_amd64

NAME

       wasmedge - standalone runtime for WebAssembly

SYNOPSIS

       wasmedge [SUBCOMMAND] [OPTIONS] [--] WASM_OR_SO [ARG ...]

DESCRIPTION

       WasmEdge    is    a    lightweight,    high-performance,    and   extensible   WebAssembly
       <https://webassembly.org/> runtime for cloud native, edge, and decentralized applications.
       It  powers  serverless  apps,  embedded functions, microservices, smart contracts, and IoT
       devices.

       The  WasmEdge  Runtime  provides  a  well-defined  execution  sandbox  for  its  contained
       WebAssembly  bytecode  program.  The runtime offers isolation and protection for operating
       system resources (e.g., file system, sockets, environment variables, processes) and memory
       space.  The  most  important  use  case  for WasmEdge is to safely execute user-defined or
       community-contributed code as plug-ins in a software product (e.g., SaaS, software-defined
       vehicles,  edge  nodes,  or  even  blockchain  nodes).  It enables third-party developers,
       vendors, suppliers, and community members to extend and customize the software product.

       wasmedge accepts a file path, WASM_OR_SO, to a WebAssembly file or a native shared library
       object as generated by wasmedge compile(1).

       ARG is the optional command line arguments array:

       •  In  reactor mode, the first argument will be the function name, and the arguments after
          ARG[0] will be parameters of wasm function ARG[0].
       •  In command mode, the arguments will be the command line arguments of  the  WASI  _start
          function.  They  are  also known as command line arguments(argv) for a standalone C/C++
          program.

SUBCOMMANDS

       compile
          WasmEdge compiler subcommand. See wasmedge-compile(1) for  the  options  applicable  to
          this mode.

       run
          WasmEdge  runtime  tool  subcommand.  wasmedge  run is an alias of wasmedge without the
          --version option. See below for the options applicable to this mode.

OPTIONS

Generic program information
-h, --help
Show the help messages. Will ignore other arguments below.

-v, --version
Show the version information. Will ignore other arguments below.

Basic options
--reactor
Enable reactor mode. Reactor mode calls _initialize if exported.

--dir
Binding directories into WASI virtual filesystem. Each directory can be specified as
--dir host_path. You can also map a guest directory to a host directory by --dir
guest_path:host_path, where guest_path specifies the path that will correspond to
host_path for calls like fopen in the guest.

--env
Environmental variables. Each variable can be specified as --env NAME=VALUE.

--force-interpreter
Forcibly run WASM in interpreter mode.

--forbidden-plugin
List of plugins to ignore.

Statistics information
--enable-time-measuring
Enable generating code for counting time during execution.

--enable-gas-measuring
Enable generating code for counting gas burned during execution.

--enable-instruction-count
Enable generating code for counting WebAssembly instructions executed.

--enable-all-statistics
Enable generating code for all statistics options include instruction counting, gas
measuring, and execution time.

Resource limitations
--time-limit
Limitation of maximum time(in milliseconds) for execution, default value is 0 for no
limitations.

--gas-limit
Limitation of execution gas. Upper bound can be specified as --gas-limit GAS_LIMIT.

--memory-page-limit
Limitation of pages(as size of 64 KiB) in every memory instance. Upper bound can be
specified as --memory-page-limit PAGE_COUNT.

WebAssembly proposals
--disable-import-export-mut-globals
Disable Import/Export of mutable globals proposal.

--disable-non-trap-float-to-int
Disable Non-trapping float-to-int conversions proposal.

--disable-sign-extension-operators
Disable Sign-extension operators proposal.

--disable-multi-value
Disable Multi-value proposal.

--disable-bulk-memory
Disable Bulk memory operations proposal.

--disable-reference-types
Disable Reference types proposal.

--disable-simd
Disable SIMD proposal.

--enable-multi-memory
Enable Multiple memories proposal.

--enable-tail-call
Enable Tail-call proposal.

--enable-extended-const
Enable Extended-const proposal.

--enable-threads
Enable Threads proposal.

--enable-all
Enable all features.

EXAMPLE

   Call a WebAssembly function
       Assuming a WebAssembly program placed under the file fibonacci.wasm, set up so to export a
       fib()  function and accepting a single i32 integer as the input parameter, one can execute
       wasmedge in reactor mode to invoke the exported function as follows:

       $ wasmedge --reactor fibonacci.wasm fib 10

   Execute a standalone WebAssembly program
       Assuming a WebAssembly program contains amain()function, printing out hello`  followed  by
       the command line arguments:

       $ wasmedge hello.wasm world

AUTHOR

       Copyright © 2019-2022 Second State INC. Licensed under the Apache License, Version 2.0.