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Extended Constant Expressions

Extended const expressions allow more forms in places that require constants, like global initializers and element/data offsets.

global.get in initializers

Section titled “global.get in initializers”
(module
  (global $base i32 (i32.const 100))
  (global (export "copy_from") i32 (global.get $base))
)

ref.func and ref.null in element segments

Section titled “ref.func and ref.null in element segments”
(module
  (type $t0 (func (param i32) (result i32)))
  (func $id (type $t0) (param $x i32) (result i32)
    (local.get $x))


  (table 2 funcref)
  (elem (i32.const 0) func $id)
)

Instruction Reference

Section titled “Instruction Reference”