Local get - WebAssembly | MDN (original) (raw)

The local.get instruction loads the value of a local variable onto the stack.

Try it

(module
  (import "console" "log" (func $log (param i32)))
  (func $main

    (local <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>v</mi><mi>a</mi><mi>r</mi><mi>i</mi><mn>32</mn><mo stretchy="false">)</mo><mo separator="true">;</mo><mo separator="true">;</mo><mi>c</mi><mi>r</mi><mi>e</mi><mi>a</mi><mi>t</mi><mi>e</mi><mi>a</mi><mi>l</mi><mi>o</mi><mi>c</mi><mi>a</mi><mi>l</mi><mi>v</mi><mi>a</mi><mi>r</mi><mi>i</mi><mi>a</mi><mi>b</mi><mi>l</mi><mi>e</mi><mi>n</mi><mi>a</mi><mi>m</mi><mi>e</mi><mi>d</mi></mrow><annotation encoding="application/x-tex">var i32) ;; create a local variable named </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.03588em;">v</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">i</span><span class="mord">32</span><span class="mclose">)</span><span class="mpunct">;;</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord mathnormal">cre</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">oc</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal" style="margin-right:0.03588em;">v</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">iab</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">e</span><span class="mord mathnormal">nam</span><span class="mord mathnormal">e</span><span class="mord mathnormal">d</span></span></span></span>var
    (local.set <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>v</mi><mi>a</mi><mi>r</mi><mo stretchy="false">(</mo><mi>i</mi><mn>32.</mn><mi>c</mi><mi>o</mi><mi>n</mi><mi>s</mi><mi>t</mi><mn>10</mn><mo stretchy="false">)</mo><mo stretchy="false">)</mo><mo separator="true">;</mo><mo separator="true">;</mo><mi>s</mi><mi>e</mi><mi>t</mi></mrow><annotation encoding="application/x-tex">var (i32.const 10)) ;; set </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.03588em;">v</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mopen">(</span><span class="mord mathnormal">i</span><span class="mord">32.</span><span class="mord mathnormal">co</span><span class="mord mathnormal">n</span><span class="mord mathnormal">s</span><span class="mord mathnormal">t</span><span class="mord">10</span><span class="mclose">))</span><span class="mpunct">;;</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord mathnormal">se</span><span class="mord mathnormal">t</span></span></span></span>var to 10
    local.get <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>v</mi><mi>a</mi><mi>r</mi><mo separator="true">;</mo><mo separator="true">;</mo><mi>l</mi><mi>o</mi><mi>a</mi><mi>d</mi></mrow><annotation encoding="application/x-tex">var ;; load </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal" style="margin-right:0.03588em;">v</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mpunct">;;</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">o</span><span class="mord mathnormal">a</span><span class="mord mathnormal">d</span></span></span></span>var onto the stack
    call $log ;; log the result

  )
  (start $main)
)

const url = "{%wasm-url%}";
await WebAssembly.instantiateStreaming(fetch(url), { console });

Syntax

;; load the value of a local variable onto the stack
local.get $val