Questions tagged [compiler]
A compiler is a computer program that translates a higher-level programming language into a lower-level language. For example: Solidity is compiled into EVM opcodes.
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Compile solidity smart contract using compiler version provided in the contract
I have been using solc-js in javascript to compile .sol contracts. However, many old smart contracts use older compiler versions that are specified using pragma in the smart contract source code. How ...
1
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0answers
13 views
What is the value range of the parameter optimize-runs when running the solidity compiler?
I would like to know what the allowed value range of the parameter optimize-runs is when running the Solidity compiler. I didn't find the answer in the official document of Solidity.
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2answers
36 views
Get values from stack when certain Opcode is called
I am currently trying to use genetic algorithms to automatically generate test cases that for ethereum smart contracts similar to https://ieeexplore.ieee.org/abstract/document/7840029>this paper. In ...
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1answer
51 views
ABIEncoderV2PackedStorage bug, is something to worry about? any info?
I have a simple factory of ERC-20 Tokens, deployed to Rinkeby using remix.
When I create contracts with this factory and verify the code in Etherscan (using etherscan API) I am having this warning in ...
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0answers
93 views
Warning: The compiled contract might be susceptible to ABIEncoderV2PackedStorage (low-severity) Solidity Compiler Bugs
This Etherscan.io gives this warning when compiled contract with solidity compiler version 0.5.5
I am sure that is low severity issue and might not apply to our use-case, but I could not find any ...
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0answers
26 views
solc command is generating empty .bin files
Firstly, this is not an inheritance problem like in this post
I have the following two files ( ManagedWallet.sol & ManagedWalletLookup.sol )
pragma solidity ^0.4.24;
contract ...
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0answers
72 views
Is there a way to download Remix IDE locally and access it from the Terminal (Linux)?
Is there a way to download Remix IDE locally and access it from the Terminal (Linux)?
Hi,
I think I have read that it should be possible to download Remix IDE and use it offline. In the latest ...
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1answer
133 views
Unhandled Rejection (Error): invalid string value (arg=“x”, coderType=“string”, value=5)
Using Truffle unbox react to unbox a boilerplate.
received the following error from running npm run start
Changes:
Addition of "memory" parameters in the simpleStorage.sol
Changed unit to string in ...
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1answer
13 views
Understanding the “.send” warning message
Warning: Failure condition of 'send' ignored. Consider using 'transfer' instead.
Is this a new compiler warning, and what exactly does it mean?
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0answers
38 views
Why the same contract has more bytecode size in solidity 0.5 in compare to 0.4.24?
My earlier contract was compatible with solc@0.4.24. Now I am upgrading my contract to make it compatible with solidity 0.5 but it leads to an increase in bytecode size. AFAICT There is no change in ...
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1answer
54 views
Error in external function parameter defination for an interface
Dear community members,
I have come across an error while defining an interface (just using the standard one interface ERC721TokenReceiver)
this interface is mentioned in this link https://github....
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2answers
912 views
Unable to run truffle compile
I want to run truffle compile on my AWS Ubuntu 18.4 server. I'm able to compile the same contracts on my local with no compilation errors but when I tried to run truffle compile on AWS ubuntu server ...
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1answer
45 views
Problem with wallet.transfer in newer solidity compilers
I read the documentation of the changes on 0.5.0 but I do not know how to get this done with my code snippet. I tried to make the constructor payable but this does not work. Can someone help me. The ...
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0answers
34 views
Can we eliminate specifying solc compiler version at the beginning of each smart contract.
Is it possible to eliminate specifying the solc compiler version at the beginning of each smart contract. This would help in separating the compiler version from the smart contract, so if the compiler ...
2
votes
1answer
513 views
Switch solc compiler versions
I have solc v0.5.2 on my system, but I have several contracts, that require solc < v0.5, so that I get errors:
Error: Source file requires different compiler version
What is the best way to run ...
0
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1answer
129 views
I build solc from source v0.4.18 but can't not use it to compile solidity. How can I solve this problem?
$ solc --bin -o ./contracts SimpleStore.sol
Warning: This is a pre-release compiler version, please do not use it in product ...
1
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1answer
238 views
Nested structs that are part of a mapping broken in Solidity 0.5.0?
The following code compiled successfully with Soldity 0.4.21. With 0.5.0 it triggers a fatal compilation error as follows:
UnimplementedFeatureError: Encoding type "struct TestNestedStructInMapping....
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1answer
137 views
Is it safe to call revert() instead of returning a value?
I have the following piece of code:
function func() public returns (bool) {
if (some condition on msg.sender) {
do some stuff
return true;
}
revert();
}
The compiler (0.4....
2
votes
2answers
23 views
Can I count on this general pattern executing correctly (similarly to C, C++ and probably any other language)?
Suppose I have something like this:
contract MyToken is ERC20 {
MyTokenImpl private myTokenImpl;
constructor(MyTokenImpl _myTokenImpl) public {
myTokenImpl = _myTokenImpl;
}
...
0
votes
1answer
63 views
Deploying fails with different compile version
I'm trying to implement a simple card game. Actually, everything is working fine. Until I tried to move from 0.4.0 to 0.4.22. Any idea what is going wrong?
Thanks a lot. And here the code:
pragma ...
1
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1answer
289 views
Why is there a difference between a public array and a function which returns it?
On-chain example:
pragma solidity 0.4.24;
contract MyContract {
uint[] public array;
constructor() public {
array.push(1);
array.push(2);
array.push(3);
}
...
2
votes
1answer
80 views
How to get the correct line numbers from `solc --ast-json`?
I have the following in a file:
contract Coin {
address public minter;
mapping (address => uint) public balances;
event Sent(address from, address to, uint amount);
function Coin() ...
2
votes
1answer
35 views
Why solc does not detect issue in this code?
I wrote a sample Solidity code below: in function call() of contract sample_call, I make a call to function add_car() function of another contract sample, but this is a bug, since variable v is never ...
0
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1answer
324 views
Remix IDE nolonger loads old solidity compilers. Error: "mock compiler: source not found|
The Ethereum solidity Remix IDE doesn't work for some reason.
It doesn't seem to load the various compiler versions and renders the error:
mock compiler: source not found
I've tried to install ...
2
votes
0answers
12 views
What is the compiler version of a contract created by internal transaction? [duplicate]
I want to be able to verify and publish a contract source code on Etherscan.io.
I have created a new contract from a factory contract, in which I successfully published and verified.
When I come to ...
1
vote
1answer
547 views
Do modifiers work in interfaces
Can an interface enforce a modifier on a function?
For example, does this work:
contract TokenSeller {
modifer enforceSale(uint256 amount) {
ERC20 t = token();
uint256 beforeBalance = t....
0
votes
3answers
233 views
Stack too deep compiler error, but function only has 5 parameters?
I have a function, shown in its entirety below, that is getting the dreaded "stack too deep" compiler error. I have read several of the other posts on this forum about this error, but all of them ...
3
votes
0answers
79 views
Why does this work with Solidity 0.4.21 but not 0.4.22?
I have this simple set of contracts.
pragma solidity ^0.4.21;
contract FirstContract {
bool public isTrue = true;
function sayHello() public pure returns(bool) {
return true;
}
}
...
0
votes
2answers
72 views
How smart contract versioning work with compiler?
As Solidity is keep updating and so the compiler.
In the beginning there was constant keyword which now is deprecated. So how does that smart contract is still working?
If i make some contract with ^0....
0
votes
2answers
105 views
My contract doesnt get published on ropsten etherscan
I get the following error: Error! Unable to generate Contract ByteCode and ABI
I've seen other people experiencing the same issue but their solutions don't work for my issue. I don't use libraries ...
1
vote
2answers
604 views
Solidity Compiler - Error: Identifier already declared
Full source code of the file 'Test.sol' :
pragma solidity ^0.4.23;
contract Mortal{
address owner;
string ownerInfo = "Contract Owner name XYZ";
constructor () public {
owner =...
2
votes
2answers
771 views
Solidity: Best practices - Which compiler version should I use? Advantages / Disadvantages
Where is the main difference between:
pragma solidity ^0.4.24; and
pragma solidity 0.4.24;
Why would I use one or the other? Advantages / Disadvantages?
What effect will it have in the future when ...
0
votes
0answers
33 views
Does the solC compiler work in the geth Javascript console anymore
does the solC compiler work in the javascript console anymore, and if it does how can I install it. I have tried using the compiler methods in the javascript console api however they do not work and ...
0
votes
1answer
149 views
The contract will not compile: Member not found or not visible [closed]
This is my code:
pragma solidity ^0.4.23;
import "./SafeMath.sol";
import "./MintableToken.sol";
import "./Ownable.sol";
import "./BurnableToken.sol";
/**
* @title Crowdsale
* @dev Crowdsale is a ...
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votes
2answers
112 views
How do I find out what compiler version was used to deploy with MyEtherWallet
If I deploy a contract on MyEtherWallet.com how can I find out what compiler version was used, for verifying the code on etherscan, etc.?
2
votes
3answers
138 views
ParseError in solidity code
This is the error i get.
ParserError: Expected pragma, import directive or
contract/interface/library definition.
This is my Solidity contract code.
pragma solidity ^0.4.6
contract Inbox
{
...
2
votes
2answers
1k views
Solved: How to change Solidity linter [solc] compiler version in Visual Studio Code?
Hi may I know how to change my Solidity linter compiler version in Visual Studio Code(vscode)? OR Visual studio code how to specify solidity compiler version?
The only Solidity related extensions I ...
8
votes
2answers
6k views
I've got an error while compiling.Use “constructor(…) { … }” instead
I've followed the lecture on Udemy. But I've got an error
here's my 'Inbox/contracts/Inbox.sol'
pragma solidity ^0.4.17;
contract Inbox {
string public message;
function Inbox(string ...
1
vote
2answers
412 views
Solidity Help - Undeclared Identifier - onlyOwner WithdrawEther
I'm new to Solidity and attempting to add a withdraw ether function for my contract which enables me to release funds the parent contract account, but the compiler (remix) keeps on giving me an ...
1
vote
1answer
451 views
Where is the compiler in Remix?
I installed remix-ide.
It is able to compile contracts. So it somehow calls Solidity compiler. Where is this compiler located in the filesystem and how to use it without remix-ide?
1
vote
1answer
1k views
Remix compiler is not loading and gives “Compiler not yet loaded.” message when attempting to force
This issue is occurring on both chrome and firefox. I have not changed anything from a week ago when it worked fine. The remix compiler works on Edge browser but not the other 2.
If anyone has any ...
1
vote
1answer
206 views
What is auxdata in the asm output from solc?
I am using -
solc --asm smartcontractname.sol
I get at the end of the asm auxdata. I am trying to check different modules to see what is inherited. Does anyone know how auxdata is computed? Here is ...
4
votes
0answers
64 views
What is the keccak256 reference in opcodes from solc? [duplicate]
Opcodes -
Opcodes:
PUSH1 0x60 PUSH1 0x40 MSTORE CALLVALUE ISZERO PUSH1 0xE JUMPI PUSH1
0x0 DUP1 REVERT JUMPDEST PUSH1 0xA0 DUP1 PUSH2 0x1C PUSH1 0x0 CODECOPY
PUSH1 0x0 RETURN STOP PUSH1 0x60 ...
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votes
1answer
2k views
Solidity: ParserError: Expected pragma, import directive or contract/interface/library definition. uint private age; ^
I am using Atom together with etheratom and I don't get why this simple code won't run:
pragma solidity ^0.4.19
contract MyFirstContract {
string private name;
uint private age;
...
2
votes
1answer
72 views
Examples of functions limitations?
I coded different functions and didn't find a standard that define crystal clear how many variables you can use (fields, local or as parameters of modifiers inside this function?
Do you know a ...
0
votes
2answers
228 views
Car Rental System Compile Error
I am writing code for a car rental system but i'm getting a few compile error messages that don't understand.
The first error is
TypeError: Expression has to be an lvalue.
The second is
...
1
vote
0answers
561 views
Solidity Compile error: Identifier already declared
I'm trying to run my code but i get this error:
Could not compile source code.
" Identifier already declared.
function addCar(string _make, string _model, unit _pricePerDay, uint _minRentalDay, ...
2
votes
1answer
912 views
How to call & use ERC20 airdrop smartcontract
I'm using remix solidity browser compiler.
I deployed this code for an AirDrop smart contract:
https://pastebin.com/kzYxmEab
I used the same address to create/deploy the Airdrop contract as was used ...
5
votes
4answers
3k views
“Mock compiler : Source not found” Error in Remix online IDE
I haven't been able to compile any solidity code because of this error.
How do I solve this problem?
0
votes
1answer
70 views
Compiling with outdated compiler
In my contracts I've been placing pragma solidity ^0.4.2; Without knowing my compiler is outdated at 0.4.16! Interestingly, all contracts still compile and are able to migrate to testrpc. Still, I ...
