NAME
Wasm::Wasm3 - Self-contained WebAssembly via wasm3
SYNOPSIS
Basic setup:
my $env = Wasm::Wasm3->new();
my $module = $env->parse_module($wasm_binary);
my $runtime = $env->create_runtime(1024)->load_module($module);WebAssembly-exported globals:
my $global = $module->get_global('some-value');
$module->set_global('some-value', 1234);WebAssembly-exported memory:
$runtime->set_memory( $offset, $bytes );
my $from_wasm = $runtime->get_memory( $offset, $length );Call a WebAssembly-exported function:
my @out = $runtime->call('some-func', @args);Implement a WebAssembly-imported function in Perl:
$runtime->link_function('mod-name', 'func-name', 'v(ii)', $coderef);(v(ii) is the function’s signature; see Wasm::Wasm3::Runtime for details.)
DESCRIPTION
Well-known WebAssembly runtimes like Wasmer, Wasmtime, or WAVM often require nonstandard dependencies/toolchains (e.g., LLVM or Rust). Their builds can take a while, especially on slow machines, and only the most popular platforms may enjoy support.
wasm3 takes a different tactic from the aforementioned “big dogs”: whereas those are all JIT compilers, wasm3 is a WebAssembly interpreter. This makes it quite small and fast/simple to build, which lets you run WebAssembly in environments that something bigger may not support. Runtime performance lags the “big dogs” significantly, but startup latency will likely be lower, and memory usage is much lower.
This distribution includes wasm3, so you don’t need to build it yourself.
STATUS
This Perl library is EXPERIMENTAL.
Additionally, wasm3 is, as of this writing, rather less complete than Wasmer et al. wasm3 only exports a single WebAssembly memory, for example. It can’t import memories or globals, and it neither imports nor exports tables.
DOCUMENTATION
This module generally documents only those aspects of its usage that are germane to this module specifically. For more details, see wasm3’s documentation.
STATIC FUNCTIONS & CONSTANTS
($MAJOR, $MINOR, $REV) = M3_VERSION
Returns wasm3’s version as 3 integers.
$STRING = M3_VERSION_STRING
Returns wasm3’s version as a string.
TYPE_I32, TYPE_I64, TYPE_F32, TYPE_F64
Numeric constants that indicate the corresponding WebAssembly type.
METHODS
$WASM3_ENV = CLASS->new()
Instanties CLASS. Creates a new wasm3 environment and binds it to the returned object.
$RUNTIME = OBJ->create_runtime( $STACKSIZE )
Creates a new wasm3 runtime from OBJ. Returns a Wasm::Wasm3::Runtime instance.
$MODULE = OBJ->parse_module( $WASM_BINARY )
Loads a WebAssembly module from binary (*.wasm) format. Returns a Wasm::Wasm3::Module instance.
If your WebAssembly module is in text format rather than binary, you’ll need to convert it first. Try wabt if you need such a tool.
LICENSE & COPYRIGHT
Copyright 2022 Gasper Software Consulting. All rights reserved.
This library is licensed under the same terms as Perl itself. See perlartistic.