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| ;; | |
| ;; Copyright 2019 Paul Dworzanski et al. | |
| ;; This file is part of c_ewasm_contracts. | |
| ;; c_ewasm_contracts is free software: you can redistribute it and/or modify | |
| ;; it under the terms of the GNU General Public License as published by | |
| ;; the Free Software Foundation, either version 3 of the License, or | |
| ;; (at your option) any later version. | |
| ;; c_ewasm_contracts is distributed in the hope that it will be useful, | |
| ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| ;; GNU General Public License for more details. | |
| ;; You should have received a copy of the GNU General Public License | |
| ;; along with c_ewasm_contracts. If not, see <https://www.gnu.org/licenses/>. | |
| ;; | |
| (module | |
| (func $revert (import "ethereum" "revert") (param i32 i32)) | |
| (func $finish (import "ethereum" "finish") (param i32 i32)) | |
| (func $getCallDataSize (import "ethereum" "getCallDataSize") (result i32)) | |
| (func $callDataCopy (import "ethereum" "callDataCopy") (param i32 i32 i32)) | |
| (func $storageLoad (import "ethereum" "storageLoad") (param i32 i32)) | |
| (func $storageStore (import "ethereum" "storageStore") (param i32 i32)) | |
| (func $getCaller (import "ethereum" "getCaller") (param i32)) | |
| (memory (export "memory") 1) | |
| (func (export "main") | |
| block | |
| block | |
| call $getCallDataSize | |
| i32.const 4 | |
| i32.ge_u | |
| br_if 0 | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| br 1 | |
| end | |
| i32.const 0 ;;selector, 4 bytes | |
| i32.const 0 | |
| i32.const 4 | |
| call $callDataCopy | |
| block | |
| i32.const 0 ;;load selector | |
| i32.load | |
| i32.const 0x1a029399 | |
| i32.eq | |
| i32.eqz | |
| br_if 0 | |
| call $do_balance | |
| br 1 | |
| end | |
| block | |
| i32.const 0 ;;load selector | |
| i32.load | |
| i32.const 0xbd9f355d | |
| i32.eq | |
| i32.eqz | |
| br_if 0 | |
| call $do_transfer | |
| br 1 | |
| end | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| end) | |
| (func $do_balance | |
| block | |
| block | |
| call $getCallDataSize | |
| i32.const 24 | |
| i32.eq | |
| br_if 0 | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| br 1 | |
| end | |
| i32.const 0 ;;address to bytes 0-31, last 12 bytes are 0-padded | |
| i32.const 4 | |
| i32.const 20 | |
| call $callDataCopy | |
| i32.const 0 ;; get token balance of address in bytes 0-31, put in bytes 32-63 | |
| i32.const 32 | |
| call $storageLoad | |
| i32.const 32 ;; return first 8 bytes of balance | |
| i32.const 8 | |
| call $finish | |
| end) | |
| (func $do_transfer | |
| (local i64 i64 i64) ;;sender_balance, recipient_balance, value | |
| block | |
| block | |
| call $getCallDataSize | |
| i32.const 32 | |
| i32.eq | |
| br_if 0 | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| br 1 | |
| end | |
| ;; memory bytes 0 32 64 | |
| ;; senderAddy recipientAddy tmpForTokenValues | |
| i32.const 0 ;;sender address to bytes 0-19 (storage key uses bytes 0-31) | |
| call $getCaller | |
| i32.const 32 ;;recipient address to bytes 32-51 (storage key uses bytes 32-63) | |
| i32.const 4 | |
| i32.const 20 | |
| call $callDataCopy | |
| i32.const 64 ;;temporarily put transfer_value in bytes 64-71, reverse 8 msb, put in in local 0 | |
| i32.const 24 | |
| i32.const 8 | |
| call $callDataCopy | |
| i32.const 64 | |
| i64.load | |
| call $i64.reverse_bytes | |
| set_local 0 | |
| i32.const 0 ;;temporarily put sender_balance into bytes 64-95, reverse 8 msb, put it in local 1 | |
| i32.const 64 | |
| call $storageLoad | |
| i32.const 64 | |
| i64.load | |
| call $i64.reverse_bytes | |
| set_local 1 | |
| i32.const 32 ;;temporarily put recipient_balance into bytes 64-95, reverse 8 msb, put in local 2 | |
| i32.const 64 | |
| call $storageLoad | |
| i32.const 64 | |
| i64.load | |
| call $i64.reverse_bytes | |
| set_local 2 | |
| block ;; if transver_value < sender_balance, then revert | |
| get_local 0 | |
| get_local 1 | |
| i64.le_u | |
| br_if 0 | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| br 1 | |
| end | |
| get_local 1 ;;sender_balance -= value | |
| get_local 0 | |
| i64.sub | |
| set_local 1 | |
| get_local 2 ;;recipient_balance += value | |
| get_local 0 | |
| i64.add | |
| set_local 2 | |
| i32.const 64 ;;reverse sender_balance, write to memory, put in storage | |
| get_local 1 | |
| call $i64.reverse_bytes | |
| i64.store | |
| i32.const 0 | |
| i32.const 64 | |
| call $storageStore | |
| i32.const 64 ;;reverse recipient_balance, write to memory, put in storage | |
| get_local 2 | |
| call $i64.reverse_bytes | |
| i64.store | |
| i32.const 32 | |
| i32.const 64 | |
| call $storageStore | |
| end) | |
| (func $i64.reverse_bytes (param i64) (result i64) | |
| (local i64 i64) ;;iter variable, val to return | |
| block | |
| loop | |
| get_local 1 ;;iter variable | |
| i64.const 8 | |
| i64.ge_u | |
| br_if 1 | |
| get_local 0 ;;original | |
| i64.const 56 ;;shift left | |
| get_local 1 | |
| i64.const 8 | |
| i64.mul | |
| i64.sub | |
| i64.shl | |
| i64.const 56 ;;shift right | |
| i64.shr_u | |
| i64.const 56 ;;shift left | |
| i64.const 8 | |
| get_local 1 | |
| i64.mul | |
| i64.sub | |
| i64.shl | |
| get_local 2 ;;update | |
| i64.add | |
| set_local 2 | |
| get_local 1 ;;iter+=1 | |
| i64.const 1 | |
| i64.add | |
| set_local 1 | |
| br 0 | |
| end | |
| end | |
| get_local 2 | |
| ) | |
| ) |
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| ;; | |
| ;; Copyright 2019 Paul Dworzanski et al. | |
| ;; This file is part of c_ewasm_contracts. | |
| ;; c_ewasm_contracts is free software: you can redistribute it and/or modify | |
| ;; it under the terms of the GNU General Public License as published by | |
| ;; the Free Software Foundation, either version 3 of the License, or | |
| ;; (at your option) any later version. | |
| ;; c_ewasm_contracts is distributed in the hope that it will be useful, | |
| ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| ;; GNU General Public License for more details. | |
| ;; You should have received a copy of the GNU General Public License | |
| ;; along with c_ewasm_contracts. If not, see <https://www.gnu.org/licenses/>. | |
| ;; | |
| (module | |
| (func $revert (import "ethereum" "revert") (param i32 i32)) | |
| (func $finish (import "ethereum" "finish") (param i32 i32)) | |
| (func $getCallDataSize (import "ethereum" "getCallDataSize") (result i32)) | |
| (func $callDataCopy (import "ethereum" "callDataCopy") (param i32 i32 i32)) | |
| (func $storageLoad (import "ethereum" "storageLoad") (param i32 i32)) | |
| (func $storageStore (import "ethereum" "storageStore") (param i32 i32)) | |
| (func $getCaller (import "ethereum" "getCaller") (param i32)) | |
| (memory (export "memory") 1) | |
| (func (export "main") | |
| block | |
| block | |
| call $getCallDataSize | |
| i32.const 4 | |
| i32.ge_u | |
| br_if 0 | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| br 1 | |
| end | |
| i32.const 0 ;;selector, 4 bytes | |
| i32.const 0 | |
| i32.const 4 | |
| call $callDataCopy | |
| block | |
| i32.const 0 ;;load selector | |
| i32.load | |
| i32.const 0x1a029399 | |
| i32.eq | |
| i32.eqz | |
| br_if 0 | |
| call $do_balance | |
| br 1 | |
| end | |
| block | |
| i32.const 0 ;;load selector | |
| i32.load | |
| i32.const 0xbd9f355d | |
| i32.eq | |
| i32.eqz | |
| br_if 0 | |
| call $do_transfer | |
| br 1 | |
| end | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| end) | |
| (func $do_balance | |
| block | |
| block | |
| call $getCallDataSize | |
| i32.const 24 | |
| i32.eq | |
| br_if 0 | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| br 1 | |
| end | |
| i32.const 0 ;;address to bytes 0-31, last 12 bytes are 0-padded | |
| i32.const 4 | |
| i32.const 20 | |
| call $callDataCopy | |
| i32.const 0 ;; get token balance of address in bytes 0-31, put in bytes 32-63 | |
| i32.const 32 | |
| call $storageLoad | |
| i32.const 32 ;; reverse bytes and put back in memory | |
| i32.const 32 | |
| i64.load | |
| call $i64.reverse_bytes | |
| i64.store | |
| i32.const 32 ;; return first 8 bytes of balance | |
| i32.const 8 | |
| call $finish | |
| end) | |
| (func $do_transfer | |
| (local i64 i64 i64) ;;sender_balance, recipient_balance, value | |
| block | |
| block | |
| call $getCallDataSize | |
| i32.const 32 | |
| i32.eq | |
| br_if 0 | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| br 1 | |
| end | |
| ;; memory bytes 0 32 64 | |
| ;; senderAddy recipientAddy tmpForTokenValues | |
| i32.const 0 ;;sender address to bytes 0-19 (storage key uses bytes 0-31) | |
| call $getCaller | |
| i32.const 32 ;;recipient address to bytes 32-51 (storage key uses bytes 32-63) | |
| i32.const 4 | |
| i32.const 20 | |
| call $callDataCopy | |
| i32.const 64 ;;temporarily put transfer_value in bytes 64-71, reverse 8 msb, put in in local 0 | |
| i32.const 24 | |
| i32.const 8 | |
| call $callDataCopy | |
| i32.const 64 | |
| i64.load | |
| call $i64.reverse_bytes | |
| set_local 0 | |
| i32.const 0 ;;temporarily put sender_balance into bytes 64-95, reverse 8 msb, put it in local 1 | |
| i32.const 64 | |
| call $storageLoad | |
| i32.const 64 | |
| i64.load | |
| set_local 1 | |
| i32.const 32 ;;temporarily put recipient_balance into bytes 64-95, reverse 8 msb, put in local 2 | |
| i32.const 64 | |
| call $storageLoad | |
| i32.const 64 | |
| i64.load | |
| set_local 2 | |
| block ;; if transver_value < sender_balance, then revert | |
| get_local 0 | |
| get_local 1 | |
| i64.le_u | |
| br_if 0 | |
| i32.const 0 | |
| i32.const 0 | |
| call $revert | |
| br 1 | |
| end | |
| get_local 1 ;;sender_balance -= value | |
| get_local 0 | |
| i64.sub | |
| set_local 1 | |
| get_local 2 ;;recipient_balance += value | |
| get_local 0 | |
| i64.add | |
| set_local 2 | |
| i32.const 64 ;;reverse sender_balance, write to memory, put in storage | |
| get_local 1 | |
| i64.store | |
| i32.const 0 | |
| i32.const 64 | |
| call $storageStore | |
| i32.const 64 ;;reverse recipient_balance, write to memory, put in storage | |
| get_local 2 | |
| i64.store | |
| i32.const 32 | |
| i32.const 64 | |
| call $storageStore | |
| end) | |
| (func $i64.reverse_bytes (param i64) (result i64) | |
| (local i64 i64) ;;iter variable, val to return | |
| block | |
| loop | |
| get_local 1 ;;iter variable | |
| i64.const 8 | |
| i64.ge_u | |
| br_if 1 | |
| get_local 0 ;;original | |
| i64.const 56 ;;shift left | |
| get_local 1 | |
| i64.const 8 | |
| i64.mul | |
| i64.sub | |
| i64.shl | |
| i64.const 56 ;;shift right | |
| i64.shr_u | |
| i64.const 56 ;;shift left | |
| i64.const 8 | |
| get_local 1 | |
| i64.mul | |
| i64.sub | |
| i64.shl | |
| get_local 2 ;;update | |
| i64.add | |
| set_local 2 | |
| get_local 1 ;;iter+=1 | |
| i64.const 1 | |
| i64.add | |
| set_local 1 | |
| br 0 | |
| end | |
| end | |
| get_local 2 | |
| ) | |
| ) |
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