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(module
(import "wasi_snapshot_preview1" "environ_get"
(func $__wasi_environ_get (param i32 i32) (result i32)))
(import "wasi_snapshot_preview1" "environ_sizes_get"
(func $__wasi_environ_sizes_get (param i32 i32) (result i32)))
(func (export "run") (param $iters i64) (result i64)
(local $i i64)
(local.set $i (i64.const 0))
(loop $cont
;; Read the current environment key-value pairs by:
;; 1) retrieving the environment sizes and then
;; 2) retrieving the environment data itself.
;; Retrieve the sizes of the environment with parameters:
;; - the address at which to write the number of environment
;; variables
;; - the address at which to write the size of the environment
;; buffer
;; Returns an error code.
(call $__wasi_environ_sizes_get (i32.const 0) (i32.const 4))
(drop)
;; Read the environment with parameters:
;; - the address at which to write the array of environment pointers
;; (i.e., one pointer per key-value pair); here we overwrite
;; the size written at address 0
;; - the address at which to write the buffer of key-value pairs
;; (pointed to by the items written to the first address); we
;; calculate where to start the buffer based on the size of the
;; pointer list (i.e., number of key-value pairs * 4 bytes per
;; pointer)
;; Returns an error code.
(call $__wasi_environ_get
(i32.const 0)
(i32.mul (i32.load (i32.const 0)) (i32.const 4)))
(drop)
;; Continue looping until $i reaches $iters.
(local.set $i (i64.add (local.get $i) (i64.const 1)))
(br_if $cont (i64.lt_u (local.get $i) (local.get $iters)))
)
(local.get $i)
)
(memory (export "memory") 1)
)
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