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wasm-simple.wat
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wasm-simple.wat
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(module
(import "js" "output" (func $output (param i32)))
(import "js" "memory" (memory $mem 1))
(func $jump_forward
(param $pc i32)
(result i32)
(local $counter i32)
(loop $root
local.get $pc
i32.load8_u
i32.const 91 ;; '['
i32.eq
(if
(then
local.get $counter
i32.const 1
i32.add
local.set $counter
)
)
local.get $pc
i32.load8_u
i32.const 93 ;; ']'
i32.eq
(if
(then
local.get $counter
i32.const 1
i32.sub
local.set $counter
)
)
local.get $counter
i32.const 0
i32.ne
(if
(then
local.get $pc
i32.const 1
i32.add
local.set $pc
br $root
)
)
)
local.get $pc
)
(func $jump_backward
(param $pc i32)
(result i32)
(local $counter i32)
(loop $root
local.get $pc
i32.load8_u
i32.const 91 ;; '['
i32.eq
(if
(then
local.get $counter
i32.const 1
i32.sub
local.set $counter
)
)
local.get $pc
i32.load8_u
i32.const 93 ;; ']'
i32.eq
(if
(then
local.get $counter
i32.const 1
i32.add
local.set $counter
)
)
local.get $counter
i32.const 0
i32.ne
(if
(then
local.get $pc
i32.const 1
i32.sub
local.set $pc
br $root
)
)
)
local.get $pc
)
(func $compute
(local $pc i32 (; program counter ;))
(local $pointer i32 (; pointer ;))
i32.const 30000
local.set $pointer
(loop $main_loop
local.get $pc
i32.load8_u
i32.eqz
(if
(then
;; go to the end
)
(else
local.get $pc
i32.load8_u
i32.const 62 ;; ">"
i32.eq
(if
(then
local.get $pointer
i32.const 4
i32.add
local.set $pointer
)
)
local.get $pc
i32.load8_u
i32.const 60 ;; "<"
i32.eq
(if
(then
local.get $pointer
i32.const 4
i32.sub
local.set $pointer
)
)
local.get $pc
i32.load8_u
i32.const 43 ;; "+"
i32.eq
(if
(then
local.get $pointer
local.get $pointer
i32.load
i32.const 1
i32.add
i32.store
)
)
local.get $pc
i32.load8_u
i32.const 45 ;; "-"
i32.eq
(if
(then
local.get $pointer
local.get $pointer
i32.load
i32.const 1
i32.sub
i32.store
)
)
local.get $pc
i32.load8_u
i32.const 46 ;; "."
i32.eq
(if
(then
local.get $pointer
i32.load
call $output
)
)
local.get $pc
i32.load8_u
i32.const 91 ;; "["
i32.eq
(if
(then
local.get $pointer
i32.load
i32.eqz
(if
(then
local.get $pc
call $jump_forward
local.set $pc
)
)
)
(else
local.get $pc
i32.load8_u
i32.const 93 ;; "]"
i32.eq
(if
(then
local.get $pointer
i32.load
i32.const 0
i32.ne
(if
(then
local.get $pc
call $jump_backward
local.set $pc
)
)
)
)
)
)
local.get $pc
i32.const 1
i32.add
local.set $pc
br $main_loop
)
)
)
)
(export "compute" (func $compute))
)