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Use solidity's assembler for fun and profit
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| $ cat foo.ir | |
| IR: | |
| /******************************************************* | |
| * WARNING * | |
| * Solidity to Yul compilation is still EXPERIMENTAL * | |
| * It can result in LOSS OF FUNDS or worse * | |
| * !USE AT YOUR OWN RISK! * | |
| *******************************************************/ | |
| object "X_17" { | |
| code { | |
| mstore(64, 128) | |
| codecopy(0, dataoffset("X_17_deployed"), datasize("X_17_deployed")) | |
| return(0, datasize("X_17_deployed")) | |
| } | |
| object "X_17_deployed" { | |
| code { | |
| mstore(64, 128) | |
| if iszero(lt(calldatasize(), 4)) | |
| { | |
| let selector := shift_right_224_unsigned(calldataload(0)) | |
| switch selector | |
| case 0xc2985578 | |
| { | |
| // foo() | |
| if callvalue() { revert(0, 0) } | |
| abi_decode_tuple_(4, calldatasize()) | |
| let ret_0 := fun_8_foo() | |
| let memPos := allocateMemory(0) | |
| let memEnd := abi_encode_tuple_t_uint256__to_t_uint256__fromStack(memPos , ret_0) | |
| return(memPos, sub(memEnd, memPos)) | |
| } | |
| case 0xfebb0f7e | |
| { | |
| // bar() | |
| if callvalue() { revert(0, 0) } | |
| abi_decode_tuple_(4, calldatasize()) | |
| let ret_0 := fun_16_bar() | |
| let memPos := allocateMemory(0) | |
| let memEnd := abi_encode_tuple_t_string_memory_ptr__to_t_string_memory_ptr__fromStack(memPos , ret_0) | |
| return(memPos, sub(memEnd, memPos)) | |
| } | |
| default {} | |
| } | |
| revert(0, 0) | |
| function abi_decode_tuple_(headStart, dataEnd) { | |
| if slt(sub(dataEnd, headStart), 0) { revert(0, 0) } | |
| } | |
| function abi_encode_t_string_memory_ptr_to_t_string_memory_ptr_fromStack(value, pos) -> end { | |
| let length := array_length_t_string_memory_ptr(value) | |
| pos := array_storeLengthForEncoding_t_string_memory_ptr_fromStack(pos, length) | |
| copy_memory_to_memory(add(value, 0x20), pos, length) | |
| end := add(pos, round_up_to_mul_of_32(length)) | |
| } | |
| function abi_encode_t_uint256_to_t_uint256_fromStack(value, pos) { | |
| mstore(pos, cleanup_t_uint256(value)) | |
| } | |
| function abi_encode_tuple_t_string_memory_ptr__to_t_string_memory_ptr__fromStack(headStart , value0) -> tail { | |
| tail := add(headStart, 32) | |
| mstore(add(headStart, 0), sub(tail, headStart)) | |
| tail := abi_encode_t_string_memory_ptr_to_t_string_memory_ptr_fromStack(value0, tail) | |
| } | |
| function abi_encode_tuple_t_uint256__to_t_uint256__fromStack(headStart , value0) -> tail { | |
| tail := add(headStart, 32) | |
| abi_encode_t_uint256_to_t_uint256_fromStack(value0, add(headStart, 0)) | |
| } | |
| function allocateMemory(size) -> memPtr { | |
| memPtr := mload(64) | |
| let newFreePtr := add(memPtr, size) | |
| // protect against overflow | |
| if or(gt(newFreePtr, 0xffffffffffffffff), lt(newFreePtr, memPtr)) { revert(0, 0) } | |
| mstore(64, newFreePtr) | |
| } | |
| function array_length_t_string_memory_ptr(value) -> length { | |
| length := mload(value) | |
| } | |
| function array_storeLengthForEncoding_t_string_memory_ptr_fromStack(pos, length) -> updated_pos { | |
| mstore(pos, length) | |
| updated_pos := add(pos, 0x20) | |
| } | |
| function cleanup_t_uint256(value) -> cleaned { | |
| cleaned := value | |
| } | |
| function copy_memory_to_memory(src, dst, length) { | |
| let i := 0 | |
| for { } lt(i, length) { i := add(i, 32) } | |
| { | |
| mstore(add(dst, i), mload(add(src, i))) | |
| } | |
| if gt(i, length) | |
| { | |
| // clear end | |
| mstore(add(dst, length), 0) | |
| } | |
| } | |
| function fun_16_bar() -> vloc__11 {}function fun_8_foo() -> vloc__3 {} | |
| function round_up_to_mul_of_32(value) -> result { | |
| result := and(add(value, 31), not(31)) | |
| } | |
| function shift_right_224_unsigned(value) -> newValue { | |
| newValue := shr(224, value) | |
| } | |
| } | |
| } | |
| } |
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| // compile me with solc --asm | |
| contract X { | |
| function foo() external returns (uint256) { | |
| return 0x7777; | |
| } | |
| /* | |
| function bar() external returns (string memory) { | |
| return "this is a really long string that is longer than 32 bytes"; | |
| } | |
| */ | |
| } |
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| foo.sol:1:1: Warning: Source file does not specify required compiler version! Consider adding "pragma solidity ^0.5.7;" | |
| contract X { | |
| ^ (Relevant source part starts here and spans across multiple lines). | |
| foo.sol:2:3: Warning: Function state mutability can be restricted to pure | |
| function foo() external returns (uint256) { | |
| ^ (Relevant source part starts here and spans across multiple lines). | |
| ======= foo.sol:X ======= | |
| EVM assembly: | |
| /* "foo.sol":0:220 contract X {... */ | |
| mstore(0x40, 0x80) | |
| callvalue | |
| /* "--CODEGEN--":8:17 */ | |
| dup1 | |
| /* "--CODEGEN--":5:7 */ | |
| iszero | |
| tag_1 | |
| jumpi | |
| /* "--CODEGEN--":30:31 */ | |
| 0x00 | |
| /* "--CODEGEN--":27:28 */ | |
| dup1 | |
| /* "--CODEGEN--":20:32 */ | |
| revert | |
| /* "--CODEGEN--":5:7 */ | |
| tag_1: | |
| /* "foo.sol":0:220 contract X {... */ | |
| pop | |
| dataSize(sub_0) | |
| dup1 | |
| dataOffset(sub_0) | |
| 0x00 | |
| codecopy | |
| 0x00 | |
| return | |
| stop | |
| sub_0: assembly { | |
| /* "foo.sol":0:220 contract X {... */ | |
| mstore(0x40, 0x80) | |
| callvalue | |
| /* "--CODEGEN--":8:17 */ | |
| dup1 | |
| /* "--CODEGEN--":5:7 */ | |
| iszero | |
| tag_1 | |
| jumpi | |
| /* "--CODEGEN--":30:31 */ | |
| 0x00 | |
| /* "--CODEGEN--":27:28 */ | |
| dup1 | |
| /* "--CODEGEN--":20:32 */ | |
| revert | |
| /* "--CODEGEN--":5:7 */ | |
| tag_1: | |
| /* "foo.sol":0:220 contract X {... */ | |
| pop | |
| jumpi(tag_2, lt(calldatasize, 0x04)) | |
| shr(0xe0, calldataload(0x00)) | |
| dup1 | |
| 0xc2985578 | |
| eq | |
| tag_3 | |
| jumpi | |
| tag_2: | |
| 0x00 | |
| dup1 | |
| revert | |
| /* "foo.sol":15:81 function foo() external returns (uint256) {... */ | |
| tag_3: | |
| tag_4 | |
| tag_5 | |
| jump // in | |
| tag_4: | |
| mload(0x40) | |
| dup1 | |
| dup3 | |
| dup2 | |
| mstore | |
| 0x20 | |
| add | |
| swap2 | |
| pop | |
| pop | |
| mload(0x40) | |
| dup1 | |
| swap2 | |
| sub | |
| swap1 | |
| return | |
| tag_5: | |
| /* "foo.sol":48:55 uint256 */ | |
| 0x00 | |
| /* "foo.sol":70:76 0x7777 */ | |
| 0x7777 | |
| /* "foo.sol":63:76 return 0x7777 */ | |
| swap1 | |
| pop | |
| /* "foo.sol":15:81 function foo() external returns (uint256) {... */ | |
| swap1 | |
| jump // out | |
| auxdata: 0xa165627a7a7230582000d23883a175630e4f81d9c4f025269a9921ce68a6668f8e16e49e57eec60c130029 | |
| } | |
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| /* compile me with solc --assemble */ | |
| // REMOVED | |
| // sub_0: assembly { | |
| // ADDED | |
| { | |
| /* add any code here */ | |
| /* "foo.sol":0:220 contract X {... */ | |
| mstore(0x40, 0x80) | |
| callvalue | |
| /* "--CODEGEN--":8:17 */ | |
| dup1 | |
| /* "--CODEGEN--":5:7 */ | |
| iszero | |
| tag_1 | |
| jumpi | |
| /* "--CODEGEN--":30:31 */ | |
| 0x00 | |
| /* "--CODEGEN--":27:28 */ | |
| dup1 | |
| /* "--CODEGEN--":20:32 */ | |
| revert | |
| /* "--CODEGEN--":5:7 */ | |
| tag_1: | |
| /* "foo.sol":0:220 contract X {... */ | |
| pop | |
| jumpi(tag_2, lt(calldatasize, 0x04)) | |
| shr(0xe0, calldataload(0x00)) | |
| dup1 | |
| 0xc2985578 | |
| eq | |
| tag_3 | |
| jumpi | |
| tag_2: | |
| 0x00 | |
| dup1 | |
| revert | |
| /* "foo.sol":15:81 function foo() external returns (uint256) {... */ | |
| tag_3: | |
| tag_4 | |
| tag_5 | |
| jump // in | |
| tag_4: | |
| mload(0x40) | |
| dup1 | |
| dup3 | |
| dup2 | |
| mstore | |
| 0x20 | |
| add | |
| swap2 | |
| pop | |
| pop | |
| mload(0x40) | |
| dup1 | |
| swap2 | |
| sub | |
| swap1 | |
| return | |
| tag_5: | |
| /* "foo.sol":48:55 uint256 */ | |
| 0x00 | |
| /* "foo.sol":70:76 0x7777 */ | |
| 0x7777 | |
| /* "foo.sol":63:76 return 0x7777 */ | |
| swap1 | |
| pop | |
| /* "foo.sol":15:81 function foo() external returns (uint256) {... */ | |
| swap1 | |
| jump // out | |
| // ADDED | |
| pop | |
| // REMOVED | |
| // auxdata: 0xa165627a7a7230582000d23883a175630e4f81d9c4f025269a9921ce68a6668f8e16e49e57eec60c130029 | |
| } | |
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| ======= runtime.asm (EVM) ======= | |
| Pretty printed source: | |
| object "object" { | |
| code { | |
| mstore(0x40, 0x80) | |
| callvalue | |
| dup1 | |
| iszero | |
| tag_1 | |
| jumpi | |
| 0x00 | |
| dup1 | |
| revert | |
| tag_1: | |
| pop | |
| jumpi(tag_2, lt(calldatasize(), 0x04)) | |
| shr(0xe0, calldataload(0x00)) | |
| dup1 | |
| 0xc2985578 | |
| eq | |
| tag_3 | |
| jumpi | |
| tag_2: | |
| 0x00 | |
| dup1 | |
| revert | |
| tag_3: | |
| tag_4 | |
| tag_5 | |
| jump | |
| tag_4: | |
| mload(0x40) | |
| dup1 | |
| dup3 | |
| dup2 | |
| mstore | |
| 0x20 | |
| add | |
| swap2 | |
| pop | |
| pop | |
| mload(0x40) | |
| dup1 | |
| swap2 | |
| sub | |
| swap1 | |
| return | |
| tag_5: | |
| 0x00 | |
| 0x7777 | |
| swap1 | |
| pop | |
| swap1 | |
| jump | |
| pop | |
| } | |
| } | |
| Binary representation: | |
| 6080604052348015600f57600080fd5b506004361060285760003560e01c8063c298557814602d575b600080fd5b60336049565b6040518082815260200191505060405180910390f35b60006177779050905650 | |
| Text representation: | |
| /* "runtime.asm":135:139 */ | |
| 0x80 | |
| /* "runtime.asm":129:133 */ | |
| 0x40 | |
| /* "runtime.asm":122:140 */ | |
| mstore | |
| /* "runtime.asm":147:156 */ | |
| callvalue | |
| /* "runtime.asm":198:202 */ | |
| dup1 | |
| /* "runtime.asm":243:249 */ | |
| iszero | |
| /* "runtime.asm":256:261 */ | |
| tag_1 | |
| /* "runtime.asm":268:273 */ | |
| jumpi | |
| /* "runtime.asm":316:320 */ | |
| 0x00 | |
| /* "runtime.asm":363:367 */ | |
| dup1 | |
| /* "runtime.asm":410:416 */ | |
| revert | |
| /* "runtime.asm":455:460 */ | |
| tag_1: | |
| /* "runtime.asm":515:518 */ | |
| pop | |
| /* "runtime.asm":555:559 */ | |
| 0x04 | |
| /* "runtime.asm":541:553 */ | |
| calldatasize | |
| /* "runtime.asm":538:560 */ | |
| lt | |
| /* "runtime.asm":531:536 */ | |
| tag_2 | |
| /* "runtime.asm":525:561 */ | |
| jumpi | |
| /* "runtime.asm":591:595 */ | |
| 0x00 | |
| /* "runtime.asm":578:596 */ | |
| calldataload | |
| /* "runtime.asm":572:576 */ | |
| 0xe0 | |
| /* "runtime.asm":568:597 */ | |
| shr | |
| /* "runtime.asm":604:608 */ | |
| dup1 | |
| /* "runtime.asm":615:625 */ | |
| 0xc2985578 | |
| /* "runtime.asm":632:634 */ | |
| eq | |
| /* "runtime.asm":641:646 */ | |
| tag_3 | |
| /* "runtime.asm":653:658 */ | |
| jumpi | |
| /* "runtime.asm":663:668 */ | |
| tag_2: | |
| /* "runtime.asm":676:680 */ | |
| 0x00 | |
| /* "runtime.asm":687:691 */ | |
| dup1 | |
| /* "runtime.asm":698:704 */ | |
| revert | |
| /* "runtime.asm":787:792 */ | |
| tag_3: | |
| /* "runtime.asm":800:805 */ | |
| tag_4 | |
| /* "runtime.asm":812:817 */ | |
| tag_5 | |
| /* "runtime.asm":824:828 */ | |
| jump | |
| /* "runtime.asm":839:844 */ | |
| tag_4: | |
| /* "runtime.asm":858:862 */ | |
| 0x40 | |
| /* "runtime.asm":852:863 */ | |
| mload | |
| /* "runtime.asm":870:874 */ | |
| dup1 | |
| /* "runtime.asm":881:885 */ | |
| dup3 | |
| /* "runtime.asm":892:896 */ | |
| dup2 | |
| /* "runtime.asm":903:909 */ | |
| mstore | |
| /* "runtime.asm":916:920 */ | |
| 0x20 | |
| /* "runtime.asm":927:930 */ | |
| add | |
| /* "runtime.asm":937:942 */ | |
| swap2 | |
| /* "runtime.asm":949:952 */ | |
| pop | |
| /* "runtime.asm":959:962 */ | |
| pop | |
| /* "runtime.asm":975:979 */ | |
| 0x40 | |
| /* "runtime.asm":969:980 */ | |
| mload | |
| /* "runtime.asm":987:991 */ | |
| dup1 | |
| /* "runtime.asm":998:1003 */ | |
| swap2 | |
| /* "runtime.asm":1010:1013 */ | |
| sub | |
| /* "runtime.asm":1020:1025 */ | |
| swap1 | |
| /* "runtime.asm":1032:1038 */ | |
| return | |
| /* "runtime.asm":1043:1048 */ | |
| tag_5: | |
| /* "runtime.asm":1095:1099 */ | |
| 0x00 | |
| /* "runtime.asm":1144:1150 */ | |
| 0x7777 | |
| /* "runtime.asm":1202:1207 */ | |
| swap1 | |
| /* "runtime.asm":1214:1217 */ | |
| pop | |
| /* "runtime.asm":1302:1307 */ | |
| swap1 | |
| /* "runtime.asm":1314:1318 */ | |
| jump | |
| /* "runtime.asm":1354:1357 */ | |
| pop | |
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| /* compile me with solc --assemble */ | |
| // REMOVED | |
| // sub_0: assembly { | |
| // ADDED | |
| { | |
| /* manual code addition */ | |
| 0 | |
| pop | |
| /* end manual code */ | |
| /* "foo.sol":0:220 contract X {... */ | |
| mstore(0x40, 0x80) | |
| callvalue | |
| /* "--CODEGEN--":8:17 */ | |
| dup1 | |
| /* "--CODEGEN--":5:7 */ | |
| iszero | |
| tag_1 | |
| jumpi | |
| /* "--CODEGEN--":30:31 */ | |
| 0x00 | |
| /* "--CODEGEN--":27:28 */ | |
| dup1 | |
| /* "--CODEGEN--":20:32 */ | |
| revert | |
| /* "--CODEGEN--":5:7 */ | |
| tag_1: | |
| /* "foo.sol":0:220 contract X {... */ | |
| pop | |
| jumpi(tag_2, lt(calldatasize, 0x04)) | |
| shr(0xe0, calldataload(0x00)) | |
| dup1 | |
| 0xc2985578 | |
| eq | |
| tag_3 | |
| jumpi | |
| tag_2: | |
| 0x00 | |
| dup1 | |
| revert | |
| /* "foo.sol":15:81 function foo() external returns (uint256) {... */ | |
| tag_3: | |
| tag_4 | |
| tag_5 | |
| jump // in | |
| tag_4: | |
| mload(0x40) | |
| dup1 | |
| dup3 | |
| dup2 | |
| mstore | |
| 0x20 | |
| add | |
| swap2 | |
| pop | |
| pop | |
| mload(0x40) | |
| dup1 | |
| swap2 | |
| sub | |
| swap1 | |
| return | |
| tag_5: | |
| /* "foo.sol":48:55 uint256 */ | |
| 0x00 | |
| /* "foo.sol":70:76 0x7777 */ | |
| 0x7777 | |
| /* "foo.sol":63:76 return 0x7777 */ | |
| swap1 | |
| pop | |
| /* "foo.sol":15:81 function foo() external returns (uint256) {... */ | |
| swap1 | |
| jump // out | |
| // ADDED | |
| pop | |
| // REMOVED | |
| // auxdata: 0xa165627a7a7230582000d23883a175630e4f81d9c4f025269a9921ce68a6668f8e16e49e57eec60c130029 | |
| } | |
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| Pretty printed source: | |
| object "object" { | |
| code { | |
| 0 | |
| pop | |
| mstore(0x40, 0x80) | |
| callvalue | |
| dup1 | |
| iszero | |
| tag_1 | |
| jumpi | |
| 0x00 | |
| dup1 | |
| revert | |
| tag_1: | |
| pop | |
| jumpi(tag_2, lt(calldatasize(), 0x04)) | |
| shr(0xe0, calldataload(0x00)) | |
| dup1 | |
| 0xc2985578 | |
| eq | |
| tag_3 | |
| jumpi | |
| tag_2: | |
| 0x00 | |
| dup1 | |
| revert | |
| tag_3: | |
| tag_4 | |
| tag_5 | |
| jump | |
| tag_4: | |
| mload(0x40) | |
| dup1 | |
| dup3 | |
| dup2 | |
| mstore | |
| 0x20 | |
| add | |
| swap2 | |
| pop | |
| pop | |
| mload(0x40) | |
| dup1 | |
| swap2 | |
| sub | |
| swap1 | |
| return | |
| tag_5: | |
| 0x00 | |
| 0x7777 | |
| swap1 | |
| pop | |
| swap1 | |
| jump | |
| pop | |
| } | |
| } | |
| Binary representation: | |
| 6000506080604052348015601257600080fd5b5060043610602b5760003560e01c8063c2985578146030575b600080fd5b6036604c565b6040518082815260200191505060405180910390f35b60006177779050905650 | |
| Text representation: | |
| /* "runtime.asm":45:46 */ | |
| 0x00 | |
| /* "runtime.asm":51:54 */ | |
| pop | |
| /* "runtime.asm":147:151 */ | |
| 0x80 | |
| /* "runtime.asm":141:145 */ | |
| 0x40 | |
| /* "runtime.asm":134:152 */ | |
| mstore | |
| /* "runtime.asm":159:168 */ | |
| callvalue | |
| /* "runtime.asm":210:214 */ | |
| dup1 | |
| /* "runtime.asm":255:261 */ | |
| iszero | |
| /* "runtime.asm":268:273 */ | |
| tag_1 | |
| /* "runtime.asm":280:285 */ | |
| jumpi | |
| /* "runtime.asm":328:332 */ | |
| 0x00 | |
| /* "runtime.asm":375:379 */ | |
| dup1 | |
| /* "runtime.asm":422:428 */ | |
| revert | |
| /* "runtime.asm":467:472 */ | |
| tag_1: | |
| /* "runtime.asm":527:530 */ | |
| pop | |
| /* "runtime.asm":567:571 */ | |
| 0x04 | |
| /* "runtime.asm":553:565 */ | |
| calldatasize | |
| /* "runtime.asm":550:572 */ | |
| lt | |
| /* "runtime.asm":543:548 */ | |
| tag_2 | |
| /* "runtime.asm":537:573 */ | |
| jumpi | |
| /* "runtime.asm":603:607 */ | |
| 0x00 | |
| /* "runtime.asm":590:608 */ | |
| calldataload | |
| /* "runtime.asm":584:588 */ | |
| 0xe0 | |
| /* "runtime.asm":580:609 */ | |
| shr | |
| /* "runtime.asm":616:620 */ | |
| dup1 | |
| /* "runtime.asm":627:637 */ | |
| 0xc2985578 | |
| /* "runtime.asm":644:646 */ | |
| eq | |
| /* "runtime.asm":653:658 */ | |
| tag_3 | |
| /* "runtime.asm":665:670 */ | |
| jumpi | |
| /* "runtime.asm":675:680 */ | |
| tag_2: | |
| /* "runtime.asm":688:692 */ | |
| 0x00 | |
| /* "runtime.asm":699:703 */ | |
| dup1 | |
| /* "runtime.asm":710:716 */ | |
| revert | |
| /* "runtime.asm":799:804 */ | |
| tag_3: | |
| /* "runtime.asm":812:817 */ | |
| tag_4 | |
| /* "runtime.asm":824:829 */ | |
| tag_5 | |
| /* "runtime.asm":836:840 */ | |
| jump | |
| /* "runtime.asm":851:856 */ | |
| tag_4: | |
| /* "runtime.asm":870:874 */ | |
| 0x40 | |
| /* "runtime.asm":864:875 */ | |
| mload | |
| /* "runtime.asm":882:886 */ | |
| dup1 | |
| /* "runtime.asm":893:897 */ | |
| dup3 | |
| /* "runtime.asm":904:908 */ | |
| dup2 | |
| /* "runtime.asm":915:921 */ | |
| mstore | |
| /* "runtime.asm":928:932 */ | |
| 0x20 | |
| /* "runtime.asm":939:942 */ | |
| add | |
| /* "runtime.asm":949:954 */ | |
| swap2 | |
| /* "runtime.asm":961:964 */ | |
| pop | |
| /* "runtime.asm":971:974 */ | |
| pop | |
| /* "runtime.asm":987:991 */ | |
| 0x40 | |
| /* "runtime.asm":981:992 */ | |
| mload | |
| /* "runtime.asm":999:1003 */ | |
| dup1 | |
| /* "runtime.asm":1010:1015 */ | |
| swap2 | |
| /* "runtime.asm":1022:1025 */ | |
| sub | |
| /* "runtime.asm":1032:1037 */ | |
| swap1 | |
| /* "runtime.asm":1044:1050 */ | |
| return | |
| /* "runtime.asm":1055:1060 */ | |
| tag_5: | |
| /* "runtime.asm":1107:1111 */ | |
| 0x00 | |
| /* "runtime.asm":1156:1162 */ | |
| 0x7777 | |
| /* "runtime.asm":1214:1219 */ | |
| swap1 | |
| /* "runtime.asm":1226:1229 */ | |
| pop | |
| /* "runtime.asm":1314:1319 */ | |
| swap1 | |
| /* "runtime.asm":1326:1330 */ | |
| jump | |
| /* "runtime.asm":1366:1369 */ | |
| pop | |
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