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|
(module $foreign
(memory (export "mem") 1 1)
(data 0 (i32.const 1000) "hello")
(data 0 (i32.const 2000) "olleh"))
(register "foreign" $foreign)
(module
(memory (import "foreign" "mem") 1 1)
(func $is_char (param i32 i32) (result i32)
local.get 0
i32.load8_u
local.get 1
i32.eq)
(func (export "is hello?") (param i32) (result i32)
local.get 0
i32.const 104 ;; 'h'
call $is_char
local.get 0
i32.const 1
i32.add
i32.const 101 ;; 'e'
call $is_char
local.get 0
i32.const 2
i32.add
i32.const 108 ;; 'l'
call $is_char
local.get 0
i32.const 3
i32.add
i32.const 108 ;; 'l'
call $is_char
local.get 0
i32.const 4
i32.add
i32.const 111 ;; 'o'
call $is_char
i32.and
i32.and
i32.and
i32.and
)
(func (export "is olleh?") (param i32) (result i32)
local.get 0
i32.const 111 ;; 'o'
call $is_char
local.get 0
i32.const 1
i32.add
i32.const 108 ;; 'l'
call $is_char
local.get 0
i32.const 2
i32.add
i32.const 108 ;; 'l'
call $is_char
local.get 0
i32.const 3
i32.add
i32.const 101 ;; 'e'
call $is_char
local.get 0
i32.const 4
i32.add
i32.const 104 ;; 'h'
call $is_char
i32.and
i32.and
i32.and
i32.and
)
(func (export "memory.copy") (param i32 i32 i32)
local.get 0
local.get 1
local.get 2
memory.copy))
;; Our memory has our initial data in the right places.
(assert_return
(invoke "is hello?" (i32.const 1000))
(i32.const 1))
(assert_return
(invoke "is olleh?" (i32.const 2000))
(i32.const 1))
;; Non-overlapping memory copy with dst < src.
(invoke "memory.copy" (i32.const 500) (i32.const 1000) (i32.const 5))
(assert_return
(invoke "is hello?" (i32.const 500))
(i32.const 1))
;; Non-overlapping memory copy with dst > src.
(invoke "memory.copy" (i32.const 1500) (i32.const 1000) (i32.const 5))
(assert_return
(invoke "is hello?" (i32.const 1500))
(i32.const 1))
;; Overlapping memory copy with dst < src.
(invoke "memory.copy" (i32.const 1998) (i32.const 2000) (i32.const 5))
(assert_return
(invoke "is olleh?" (i32.const 1998))
(i32.const 1))
;; Overlapping memory copy with dst > src.
(invoke "memory.copy" (i32.const 2000) (i32.const 1998) (i32.const 5))
(assert_return
(invoke "is olleh?" (i32.const 2000))
(i32.const 1))
;; Overlapping memory copy with dst = src.
(invoke "memory.copy" (i32.const 2000) (i32.const 2000) (i32.const 5))
(assert_return
(invoke "is olleh?" (i32.const 2000))
(i32.const 1))
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