0x393e...9cea

Utility

0x393e2b1d499e...d3d24c509cea

FrontierContract #1,174Exact Bytecode MatchEdit this contract

Deployed September 16, 2015 (11 years ago)Block 241,978

The Pong half of Cyrus Adkisson's contract to contract call exercise

Frontier EraVerified Source

Historical Significance

A test harness for contract to contract calls, from the period when it was not obvious that a contract could call back into its caller at all. Driving a counterparty through a cycle of states from the outside is how the reentrancy behaviour of the EVM was first explored, well before it was understood as a hazard.

Context

Frontier era deployment by Cyrus Adkisson, from his Solidity teaching repository.

Key Facts

Deployer

Cyrus Adkisson(0xcf684d...ad1bac)

Deployment Block

241,978

Deployment Date

Sep 16, 2015, 08:40 AM

Code Size

866.0 B

Gas at Deploy

231,410

Transactions by Year

20151

Deployment Transaction: 0x28f6a7a1c579441f...c2f746d0e1c85a2f

Description

The pong chapter of cyrusadkisson/solidity-baby-steps, the contract that Ping calls into. It keeps a counter that only a transactional call can increment, which is the point the exercise is making. Deployed 16 September 2015 and later destroyed.

Source Verified

Exact bytecode match(866 bytes)

Compiler: v0.1.3+

View verification proof

Heuristic Analysis

The following characteristics were detected through bytecode analysis and may not be accurate.

Detected Type: Utility

Frontier Era

The initial release of Ethereum. A bare-bones implementation for technical users.

Block span: 0 — 1,149,999

July 30, 2015 — March 14, 2016

Bytecode Overview

Opcodes866

Unique Opcodes81

Jump Instructions31

Storage Operations15

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

View Verification Proof

Show source code (Solidity)

// Submitted by EthereumHistory (ethereumhistory.com)
// Supposedly, contracts can get non-constant return values from other contracts. (Whereas you can't from web3/geth.)
// These two contracts are meant to test this. Like so:

// 1. Deploy Pong with a pongval.
// 2. Deploy Ping, giving it the address of Pong.
// 3. Call Ping.getPongvalRemote() using a sendTransaction...
// 4. ... which retreives the value of pongval from Pong.
// 5. If successful Ping.getPongval() should return the value from step 1.

// UPDATE: Pong doesn't need a copy of PongvalRetriever.
//contract PongvalRetriever {
// 	int8 pongval_tx_retrieval_attempted = 0;
//	function getPongvalTransactional() public returns (int8){	// tells Ping how to interact with Pong.
//		pongval_tx_retrieval_attempted = -1;
//		return pongval_tx_retrieval_attempted;
//	}
//}

contract Pong {

    address creator;
    int8 pongval;
    int8 pongval_tx_retrieval_attempted = 0;
    
	/*********
 	 Step 1: Deploy Pong
 	 *********/
    function Pong(int8 _pongval) 
    {
        creator = msg.sender; 
        pongval = _pongval;
    }
	
	/*********
	 Step 4. Transactionally return pongval, overriding PongvalRetriever
	 *********/	
	function getPongvalTransactional() public returns (int8)
    {
    	pongval_tx_retrieval_attempted = 1;
    	return pongval;
    }
    
// ----------------------------------------------------------------------------------------------------------------------------------------
    
    /*********
	 pongval getter/setter, just in case.
	 *********/
	function getPongvalConstant() public constant returns (int8)
    {
    	return pongval;
    } 
	 	
	function setPongval(int8 _pongval)
	{
		pongval = _pongval;
	}
	
	function getPongvalTxRetrievalAttempted() constant returns (int8)
	{
		return pongval_tx_retrieval_attempted;
	}
	
	/****
	 For double-checking this contract's address
	 ****/
	function getAddress() constant returns (address)
	{
		return this;
	}
	
    /**********
     Standard kill() function to recover funds 
     **********/
    
    function kill()
    { 
        if (msg.sender == creator)
            suicide(creator);  // kills this contract and sends remaining funds back to creator
    }
}

/*
 var _pongval = -22;

var pongContract = web3.eth.contract([{
    "constant": false,
    "inputs": [{
        "name": "_pongval",
        "type": "int8"
    }],
    "name": "setPongval",
    "outputs": [],
    "type": "function"
}, {
    "constant": true,
    "inputs": [],
    "name": "getAddress",
    "outputs": [{
        "name": "",
        "type": "address"
    }],
    "type": "function"
}, {
    "constant": true,
    "inputs": [],
    "name": "getPongvalConstant",
    "outputs": [{
        "name": "",
        "type": "int8"
    }],
    "type": "function"
}, {
    "constant": false,
    "inputs": [],
    "name": "kill",
    "outputs": [],
    "type": "function"
}, {
    "constant": true,
    "inputs": [],
    "name": "getPongvalTxRetrievalAttempted",
    "outputs": [{
        "name": "",
        "type": "int8"
    }],
    "type": "function"
}, {
    "constant": false,
    "inputs": [],
    "name": "getPongvalTransactional",
    "outputs": [{
        "name": "",
        "type": "int8"
    }],
    "type": "function"
}, {
    "inputs": [{
        "name": "_pongval",
        "type": "int8"
    }],
    "type": "constructor"
}]);
var pong = pongContract.new(
    _pongval, {
        from: web3.eth.accounts[0],
        data: '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',
        gas: 1000000
    },
    function(e, contract) {
        if (typeof contract.address != 'undefined') {
            console.log(e, contract);
            console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
        }
    });
																					// ****************************************************************** IMPORTANT!!!!!
var _pongAddress = web3.toBigNumber('0xbfb1316ab1b8e9a2a39c1c96ad325ea80c9e041f');  // ****************************************************************** IMPORTANT!!!!!
																					// ****************************************************************** IMPORTANT!!!!!

var pingContract = web3.eth.contract([{
    "constant": false,
    "inputs": [],
    "name": "getAddress",
    "outputs": [{
        "name": "",
        "type": "address"
    }],
    "type": "function"
}, {
    "constant": false,
    "inputs": [{
        "name": "_pongAddress",
        "type": "address"
    }],
    "name": "setPongAddress",
    "outputs": [],
    "type": "function"
}, {
    "constant": false,
    "inputs": [],
    "name": "getPongvalRemote",
    "outputs": [],
    "type": "function"
}, {
    "constant": true,
    "inputs": [],
    "name": "getPongvalConstant",
    "outputs": [{
        "name": "",
        "type": "int8"
    }],
    "type": "function"
}, {
    "constant": false,
    "inputs": [],
    "name": "kill",
    "outputs": [],
    "type": "function"
}, {
    "constant": true,
    "inputs": [],
    "name": "getPongAddress",
    "outputs": [{
        "name": "",
        "type": "address"
    }],
    "type": "function"
}, {
    "constant": false,
    "inputs": [],
    "name": "getPongvalTransactional",
    "outputs": [{
        "name": "",
        "type": "int8"
    }],
    "type": "function"
}, {
    "inputs": [{
        "name": "_pongAddress",
        "type": "address"
    }],
    "type": "constructor"
}]);
var ping = pingContract.new(
    _pongAddress, {
        from: web3.eth.accounts[0],
        data: '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',
        gas: 1000000
    },
    function(e, contract) {
        if (typeof contract.address != 'undefined') {
            console.log(e, contract);
            console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
        }
    });

> pong.getPongvalConstant(); // Was Pong.pongval initialized correctly?
- 22 // yes
    > ping.getPongvalConstant(); // Does Ping know what pongval is yet?
- 1 // Nope. (This is correct at this point.)
    > ping.getPongvalRemote.sendTransaction({
    from: eth.coinbase,
    gas: 1000000
}); // Tell Ping to get the pongval from Pong.
"0xc0ec18186cfccecc231af16c3caff6ee217c05833834dfaebe6ca119b51ca3a7" > ping.getPongvalConstant(); // Does Ping know what pongval is yet?
- 1 // Nope. Tx hasn't been mined yet.
    > ping.getPongvalConstant(); // How about now?
- 22 // yep! Success!

*/

External Links

Etherscan Verified Source (if any)

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