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pezkuwi-subxt/substrate/frame/contracts/fixtures/self_destruct.wat
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Alexander Theißen 04b185e3d4 seal: Change prefix and module name from "ext_" to "seal_" for contract callable functions (#6798)
* seal: Change prefix "ext_" to "seal_" for contract callable functions

The word Ext is a overloaded term in the context of substrate. It usually
is a trait which abstracts away access to external resources usually in order
to mock them away for the purpose of tests. The contract module has its own
`Ext` trait in addition the the substrate `Ext` which makes things even more
confusing.

In order to differentiate the contract callable functions more clearly from
this `Ext` concept we rename them to use the "seal_" prefix instead.

This should change no behaviour at all. This is a pure renaming commit.

* seal: Rename import module from "env" to "seal0"

* seal: Fixup integration test

* seal: Add more tests for new import module names
2020-08-10 13:14:34 +00:00

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WebAssembly Text Format

(module
(import "seal0" "seal_input" (func $seal_input (param i32 i32)))
(import "seal0" "seal_address" (func $seal_address (param i32 i32)))
(import "seal0" "seal_call" (func $seal_call (param i32 i32 i64 i32 i32 i32 i32 i32 i32) (result i32)))
(import "seal0" "seal_terminate" (func $seal_terminate (param i32 i32)))
(import "env" "memory" (memory 1 1))
;; [0, 8) reserved for $seal_address output
;; [8, 16) length of the buffer
(data (i32.const 8) "\08")
;; [16, 24) Address of django
(data (i32.const 16) "\04\00\00\00\00\00\00\00")
;; [24, 32) reserved for output of $seal_input
;; [32, 36) length of the buffer
(data (i32.const 32) "\04")
;; [36, inf) zero initialized
(func $assert (param i32)
(block $ok
(br_if $ok
(get_local 0)
)
(unreachable)
)
)
(func (export "deploy"))
(func (export "call")
;; If the input data is not empty, then recursively call self with empty input data.
;; This should trap instead of self-destructing since a contract cannot be removed live in
;; the execution stack cannot be removed. If the recursive call traps, then trap here as
;; well.
(call $seal_input (i32.const 24) (i32.const 32))
(if (i32.load (i32.const 32))
(then
(call $seal_address (i32.const 0) (i32.const 8))
;; Expect address to be 8 bytes.
(call $assert
(i32.eq
(i32.load (i32.const 8))
(i32.const 8)
)
)
;; Recursively call self with empty input data.
(call $assert
(i32.eq
(call $seal_call
(i32.const 0) ;; Pointer to own address
(i32.const 8) ;; Length of own address
(i64.const 0) ;; How much gas to devote for the execution. 0 = all.
(i32.const 36) ;; Pointer to the buffer with value to transfer
(i32.const 8) ;; Length of the buffer with value to transfer
(i32.const 0) ;; Pointer to input data buffer address
(i32.const 0) ;; Length of input data buffer
(i32.const 4294967295) ;; u32 max sentinel value: do not copy output
(i32.const 0) ;; Length is ignored in this case
)
(i32.const 0)
)
)
)
(else
;; Try to terminate and give balance to django.
(call $seal_terminate
(i32.const 16) ;; Pointer to beneficiary address
(i32.const 8) ;; Length of beneficiary address
)
(unreachable) ;; seal_terminate never returns
)
)
)
)