CREATE opcode: what does it really do?What does bytecode of blank contract do?When does a SUICIDE opcode becomes effective?Possible to create new contract via a proposal in the ethereum.org/dao framework?What are the two arguments to a RETURN opcode?Can the CALL opcode be used to create a contract?Transaction Error. Exception thrown in contract code. REVERT opcode when sending ETH to crowdsaleWhat happens in CALL when gas is set to 0?Ethereum opcode: meaning of first few instructions?callvalue opcode, for what?EVM SIGNEXTEND Opcode explanation
How easy is it to start Magic from scratch?
Is HostGator storing my password in plaintext?
Two monoidal structures and copowering
Sort a list by elements of another list
Increase performance creating Mandelbrot set in python
Is a stroke of luck acceptable after a series of unfavorable events?
System.debug(JSON.Serialize(o)) Not longer shows full string
Different result between scanning in Epson's "color negative film" mode and scanning in positive -> invert curve in post?
How can a function with a hole (removable discontinuity) equal a function with no hole?
Escape a backup date in a file name
Hostile work environment after whistle-blowing on coworker and our boss. What do I do?
Is this apparent Class Action settlement a spam message?
Integer addition + constant, is it a group?
Crossing the line between justified force and brutality
when is out of tune ok?
How does the UK government determine the size of a mandate?
Pre-amplifier input protection
Go Pregnant or Go Home
Unreliable Magic - Is it worth it?
How do I rename a Linux host without needing to reboot for the rename to take effect?
Why escape if the_content isnt?
Anatomically Correct Strange Women In Ponds Distributing Swords
You cannot touch me, but I can touch you, who am I?
Is it appropriate to ask a job candidate if we can record their interview?
CREATE opcode: what does it really do?
What does bytecode of blank contract do?When does a SUICIDE opcode becomes effective?Possible to create new contract via a proposal in the ethereum.org/dao framework?What are the two arguments to a RETURN opcode?Can the CALL opcode be used to create a contract?Transaction Error. Exception thrown in contract code. REVERT opcode when sending ETH to crowdsaleWhat happens in CALL when gas is set to 0?Ethereum opcode: meaning of first few instructions?callvalue opcode, for what?EVM SIGNEXTEND Opcode explanation
I am looking at the docs, but cannot really understand what CREATE opcode does. I can tell that CREATE does create a new smart contract from a memory chunk, pass the gas value to this new contract, then returns. But before returning, does it execute the new contract?
This confuses me because looking at the disassembly code of the smart contract bytecode, after CREATE, I cannot see any call to CALL after that, but then I still see a call to RETURNDATASIZE, which I suppose only happen after CALL. Without CALL, where it get returned data from?
Any enlighten, please?
opcode create
asked 8 hours ago
user311703user311703
1826
add a comment |
I am looking at the docs, but cannot really understand what CREATE opcode does. I can tell that CREATE does create a new smart contract from a memory chunk, pass the gas value to this new contract, then returns. But before returning, does it execute the new contract?
This confuses me because looking at the disassembly code of the smart contract bytecode, after CREATE, I cannot see any call to CALL after that, but then I still see a call to RETURNDATASIZE, which I suppose only happen after CALL. Without CALL, where it get returned data from?
Any enlighten, please?
opcode create
asked 8 hours ago
user311703user311703
1826
add a comment |
I am looking at the docs, but cannot really understand what CREATE opcode does. I can tell that CREATE does create a new smart contract from a memory chunk, pass the gas value to this new contract, then returns. But before returning, does it execute the new contract?
This confuses me because looking at the disassembly code of the smart contract bytecode, after CREATE, I cannot see any call to CALL after that, but then I still see a call to RETURNDATASIZE, which I suppose only happen after CALL. Without CALL, where it get returned data from?
Any enlighten, please?
opcode create
asked 8 hours ago
user311703user311703
1826
I am looking at the docs, but cannot really understand what CREATE opcode does. I can tell that CREATE does create a new smart contract from a memory chunk, pass the gas value to this new contract, then returns. But before returning, does it execute the new contract?
This confuses me because looking at the disassembly code of the smart contract bytecode, after CREATE, I cannot see any call to CALL after that, but then I still see a call to RETURNDATASIZE, which I suppose only happen after CALL. Without CALL, where it get returned data from?
Any enlighten, please?
opcode create
opcode create
asked 8 hours ago
user311703user311703
1826
asked 8 hours ago
user311703user311703
1826
asked 8 hours ago
user311703user311703
1826
asked 8 hours ago
user311703user311703
1826
asked 8 hours ago
user311703user311703
1826
1826
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
CREATE, in a way, does a built in CALL. What actually happens is that the data passed to call isn't the contract bytecode, it's the init bytecode.
When CREATE opcode is executed, the EVM creates a call frame in the context of the new contract (e.g. address(this) is the new contracts address). This executes the data passed to CREATE as the code, which in higher level languages is basically the constructor. At the end of this init stuff, it returns the actual code of the contract that is stored in the state trie.
The easiest way to think about it, which is also fairly accurate, is that the Solidity compiler takes all the executional code of the contract, compiles it to bytecode, and adds it as a return statement at the end of the constructor.
answered 8 hours ago
flygoingflygoing
7,595931
ah, so CREATE when creating a contract actually returns the contract bytecode, right? then after that, CALL will actually executes the contract?
– user311703
7 hours ago
Please could you tell me what is the best way to track/trace what is really happening at bytecode level? Does Remix a good tool to do this?
– user311703
7 hours ago
1
CREATE executes the code passed to it, andthatcode returns the contact bytecode, yes. Just wanted to be clear on that
– flygoing
7 hours ago
1
If you need to a call a function after it's created, then yeah, there would be aCALLright after. Remix is a pretty good way to track/trace on the bytecode level, it has pretty good EVM debugging tools for stepping in/out of bytecode
– flygoing
7 hours ago
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "642"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fethereum.stackexchange.com%2fquestions%2f68943%2fcreate-opcode-what-does-it-really-do%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
CREATE, in a way, does a built in CALL. What actually happens is that the data passed to call isn't the contract bytecode, it's the init bytecode.
When CREATE opcode is executed, the EVM creates a call frame in the context of the new contract (e.g. address(this) is the new contracts address). This executes the data passed to CREATE as the code, which in higher level languages is basically the constructor. At the end of this init stuff, it returns the actual code of the contract that is stored in the state trie.
The easiest way to think about it, which is also fairly accurate, is that the Solidity compiler takes all the executional code of the contract, compiles it to bytecode, and adds it as a return statement at the end of the constructor.
answered 8 hours ago
flygoingflygoing
7,595931
ah, so CREATE when creating a contract actually returns the contract bytecode, right? then after that, CALL will actually executes the contract?
– user311703
7 hours ago
Please could you tell me what is the best way to track/trace what is really happening at bytecode level? Does Remix a good tool to do this?
– user311703
7 hours ago
1
CREATE executes the code passed to it, andthatcode returns the contact bytecode, yes. Just wanted to be clear on that
– flygoing
7 hours ago
1
If you need to a call a function after it's created, then yeah, there would be aCALLright after. Remix is a pretty good way to track/trace on the bytecode level, it has pretty good EVM debugging tools for stepping in/out of bytecode
– flygoing
7 hours ago
add a comment |
CREATE, in a way, does a built in CALL. What actually happens is that the data passed to call isn't the contract bytecode, it's the init bytecode.
When CREATE opcode is executed, the EVM creates a call frame in the context of the new contract (e.g. address(this) is the new contracts address). This executes the data passed to CREATE as the code, which in higher level languages is basically the constructor. At the end of this init stuff, it returns the actual code of the contract that is stored in the state trie.
The easiest way to think about it, which is also fairly accurate, is that the Solidity compiler takes all the executional code of the contract, compiles it to bytecode, and adds it as a return statement at the end of the constructor.
answered 8 hours ago
flygoingflygoing
7,595931
ah, so CREATE when creating a contract actually returns the contract bytecode, right? then after that, CALL will actually executes the contract?
– user311703
7 hours ago
Please could you tell me what is the best way to track/trace what is really happening at bytecode level? Does Remix a good tool to do this?
– user311703
7 hours ago
1
CREATE executes the code passed to it, andthatcode returns the contact bytecode, yes. Just wanted to be clear on that
– flygoing
7 hours ago
1
If you need to a call a function after it's created, then yeah, there would be aCALLright after. Remix is a pretty good way to track/trace on the bytecode level, it has pretty good EVM debugging tools for stepping in/out of bytecode
– flygoing
7 hours ago
add a comment |
CREATE, in a way, does a built in CALL. What actually happens is that the data passed to call isn't the contract bytecode, it's the init bytecode.
When CREATE opcode is executed, the EVM creates a call frame in the context of the new contract (e.g. address(this) is the new contracts address). This executes the data passed to CREATE as the code, which in higher level languages is basically the constructor. At the end of this init stuff, it returns the actual code of the contract that is stored in the state trie.
The easiest way to think about it, which is also fairly accurate, is that the Solidity compiler takes all the executional code of the contract, compiles it to bytecode, and adds it as a return statement at the end of the constructor.
answered 8 hours ago
flygoingflygoing
7,595931
CREATE, in a way, does a built in CALL. What actually happens is that the data passed to call isn't the contract bytecode, it's the init bytecode.
When CREATE opcode is executed, the EVM creates a call frame in the context of the new contract (e.g. address(this) is the new contracts address). This executes the data passed to CREATE as the code, which in higher level languages is basically the constructor. At the end of this init stuff, it returns the actual code of the contract that is stored in the state trie.
The easiest way to think about it, which is also fairly accurate, is that the Solidity compiler takes all the executional code of the contract, compiles it to bytecode, and adds it as a return statement at the end of the constructor.
answered 8 hours ago
flygoingflygoing
7,595931
edited 7 hours ago
answered 8 hours ago
flygoingflygoing
7,595931
answered 8 hours ago
flygoingflygoing
7,595931
answered 8 hours ago
flygoingflygoing
7,595931
7,595931
ah, so CREATE when creating a contract actually returns the contract bytecode, right? then after that, CALL will actually executes the contract?
– user311703
7 hours ago
Please could you tell me what is the best way to track/trace what is really happening at bytecode level? Does Remix a good tool to do this?
– user311703
7 hours ago
1
CREATE executes the code passed to it, andthatcode returns the contact bytecode, yes. Just wanted to be clear on that
– flygoing
7 hours ago
1
If you need to a call a function after it's created, then yeah, there would be aCALLright after. Remix is a pretty good way to track/trace on the bytecode level, it has pretty good EVM debugging tools for stepping in/out of bytecode
– flygoing
7 hours ago
add a comment |
ah, so CREATE when creating a contract actually returns the contract bytecode, right? then after that, CALL will actually executes the contract?
– user311703
7 hours ago
Please could you tell me what is the best way to track/trace what is really happening at bytecode level? Does Remix a good tool to do this?
– user311703
7 hours ago
1
CREATE executes the code passed to it, andthatcode returns the contact bytecode, yes. Just wanted to be clear on that
– flygoing
7 hours ago
1
If you need to a call a function after it's created, then yeah, there would be aCALLright after. Remix is a pretty good way to track/trace on the bytecode level, it has pretty good EVM debugging tools for stepping in/out of bytecode
– flygoing
7 hours ago
ah, so CREATE when creating a contract actually returns the contract bytecode, right? then after that, CALL will actually executes the contract?
– user311703
7 hours ago
ah, so CREATE when creating a contract actually returns the contract bytecode, right? then after that, CALL will actually executes the contract?
– user311703
7 hours ago
Please could you tell me what is the best way to track/trace what is really happening at bytecode level? Does Remix a good tool to do this?
– user311703
7 hours ago
Please could you tell me what is the best way to track/trace what is really happening at bytecode level? Does Remix a good tool to do this?
– user311703
7 hours ago
1
1
CREATE executes the code passed to it, and
that code returns the contact bytecode, yes. Just wanted to be clear on that– flygoing
7 hours ago
CREATE executes the code passed to it, and
that code returns the contact bytecode, yes. Just wanted to be clear on that– flygoing
7 hours ago
1
1
If you need to a call a function after it's created, then yeah, there would be a
CALL right after. Remix is a pretty good way to track/trace on the bytecode level, it has pretty good EVM debugging tools for stepping in/out of bytecode– flygoing
7 hours ago
If you need to a call a function after it's created, then yeah, there would be a
CALL right after. Remix is a pretty good way to track/trace on the bytecode level, it has pretty good EVM debugging tools for stepping in/out of bytecode– flygoing
7 hours ago
add a comment |
Thanks for contributing an answer to Ethereum Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fethereum.stackexchange.com%2fquestions%2f68943%2fcreate-opcode-what-does-it-really-do%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
