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Changelog

All notable changes to Solang will be documented here.

Unreleased

Added

  • Soroban Work on adding support for Stellar's Soroban contracts platforms started, by adding a skeleton that supports the Soroban runtime. Salaheldin Soliman

  • The string.concat() and bytes.concat() builtin functions are supported. seanyoung

Changed

  • BREAKING The non-standard extension of concatenating strings using the + operator has been removed, use string.concat() instead. seanyoung
  • Removed the --no-log-api-return-codes compile flag as this is now done by the runtime xermicus

v0.3.3 Atlantis

This release improves the Solana developer experience, since now required accounts can be specified using annotations. For Polkadot, compatibility with Ethereum Solidity has been increased further, it is now possible to write EIP-1967 compatible proxy contracts. There are many fixes all over the code base.

Added

  • Solana the required accounts for instructions can now be specified using function annotations. LucasSte 
    contract Foo {
    @account(oneAccount)
    @signer(mySigner)
    @mutableAccount(otherAccount)
    @mutableSigner(otherSigner)
    function bar() external returns (uint64) {}
}
  • The language server can now format Solidity source code using the forge-fmt crate. chioni16
  • The langauge server can now do go references, go to implementation, and go to type definition. chioni16
  • Polkadot Panic errors can now be caught in try-catch statements xermicus
  • Polkadot custom errors are now supported xermicus
  • Polkadot now supporting the address.code builtin xermicus

Fixed

  • Solana the data field of AccountInfo can now be modified. LucasSte
  • The vscode extension now uses the solang binary in the path, if available. seanyoung
  • Fixed a bug in the ABI encoding of dynamic arrays. xermicus
  • Fixed a bug where loading from a storage struct member was not considered a storage read. xermicus seanyoung
  • Fixed a compiler crash caused by chained assignments like return a = b. xermicus
  • Variables declared in the return parameters no longer ignore the storage location. xermicus

Changed

  • BREAKING: Solana the contract Solidity type can no longer be used. This type used to represent a single address, but this does not make sense as there are many accounts associated with a contract call. LucasSte

v0.3.2 Brasília

The language server is much improved, and many fixes all over.

Added

  • Go to definition is now implemented in the language server. chioni16
  • The parser has been updated to be compatible with Ethereum Solidity v0.8.21. seanyoung
  • Polkadot Support for runtimes built with on polkadot-v1.0.0

Fixed

  • breaking Resolving import paths now matches solc more closely, and only resolves relative paths when specified as ./foo or ../foo. seanyoung
  • Solana The lamports and data fields of tx.accounts can be modified again. LucasSte
  • Solana The address.transfer() and address.send() functions no longer change any balances in the error case if there was an overflow (e.g. not enough balance). LucasSte
  • Solana When collecting the required accounts, ensure that the writer and signer bits are set correctly if the same account is used multiple times. LucasSte
  • It is not longer necessary to save a Solidity file, in order for the language server to pick up changes to the file. chioni16
  • The negate operator - now checks for overflow at runtime, and other math overflow fixes. seanyoung
  • Fixed a bug where accessing the function selector of virtual functions might cause a compiler panic. xermicus
  • Fixed a bug where the strength reduce optimization pass removed overflow checks on optimized multiplications. xermicus
  • Fixed a bug where external function variables were not marked as read when they were called by the semantic analyzer, which could lead to the external function call being eliminated spuriously. xermicus
  • Fixed a bug in try-catch where a failed transfer trapped the contract instead of handling it in a catch all block. xermicus

Changed

  • The Substrate target has been renamed to Polkadot. xermicus
  • Polkadot assert() and require() is now implemented as a transction revert, rather than a trap. The error data is returned, and encoded the same as on Ethereum. Error data is now passed to the calling contract, all the way up the call stack. xermicus
  • Polkadot constructor can be non-payable. xermicus
  • Storage variables are now always written to, regardless whether the contract does read them or not. Prior behavior was to not write to storage variables if they are not read, which can remove wanted side effects, because unused storage variables may be used in future versions of the contract. xermicus
  • Solana seeds can now be of type address or bytesN, in addition to bytes. seanyoung

v0.3.1 Göttingen

Added

  • Write environment configuration into Substrate metadata. xermicus
  • Tornado cash as an exemplary integration test for Substrate chain extensions. xermicus
  • is_contract runtime API is available as a builtin for Substrate. xermicus
  • The wasm-opt optimizer now optimizes the Wasm bytecode on the Substrate target. xermicus
  • Call flags are now available for Substrate. xermicus
  • Read compiler configurations from toml file. salaheldinsoliman
  • Accounts declared with @payer(my_account) can be accessed with the syntax tx.accounts.my_account. LucasSte
  • delegatecall() builtin has been added for Substrate. xermicus
  • get_contents_of_file_no for Solang parser. BenTheKush
  • set_code_hash() builtin has been aded for Substrate. xermicus

Fixed

  • Diagnostics do not include large numbers anymore. seanyoung
  • Correctly parse and resolve require(i < 2**255). seanyoung
  • Virtual function are available for call. xermicus
  • Allow .wrap() and .unwrap() user defined type methods in constants. xermicus
  • @inheritdoc now works with bases of bases. seanyoung
  • Allow destructures to assign to storage variables. seanyoung
  • Do not allow push and pop in fixed length arrays. LucasSte
  • Improve unused variable elimination to remove unused arrays. LucasSte
  • Salt argument should be of type bytes32. seanyoung
  • Allow return vallues to be ignored in try-catch statements. seanyoung
  • Optimize modifiers' CFGs. xermicus
  • Fix an error whereby building large contracts would cause an LLVM error. LucasSte
  • A constructor for a Solana contract cannot run twice on the same data account. seanyoung
  • Split the call and deploy dispatches on Substrate. xermicus

Changed

  • Minimum Supported Rust Version (MSRV) is Rust 1.68.
  • @payer annotation declares an account in a constructor. LucasSte
  • Do not allow .call() functions in functions declared as view. seanyoung
  • Storage accessor function matches solc, and returns struct members if the sole return value is a single struct seanyoung
  • breaking Constructor annotations above a constructor can either declare an account or receive a literal parameter. LucasSte 
    contract MyContract {
  @payer(acc) // Declares account acc
  @space(2+3) // Only literals or constant expressions allowed
  @seed(myseed) // NOT ALLOWED
  constructor(bytes myseed) {}
}
  • Annotations placed before constructor arguments refer to the latter. LucasSte 
    contract MyContract {
  @payer(acc) // Declares account acc
  @space(2+3) // Only literals or constant expressions allowed
  constructor(@seed bytes myseed) {}
  // When an annotations refers to a parameter, the former must appear right before the latter.
}

v0.3.0 Venice

The parser and semantic analysis stage of Solang have gone through a security audit. All security issues have been fixed.

Added

  • The CLI now has a --release option, which disables printing of errors salaheldinsoliman
  • Substrate: chain extensions can be now used. xermicus

Fixed

  • Solidity error definitions are now parsed. seanyoung
  • The Ethereum Solidity parser and semantic analysis tests are now run on Solang sema during cargo test. seanyoung
  • If a function returns a storage reference, then not returning a value explicitly is an error, since the reference must refer to an existing storage variable. seanyoung
  • Many small improvements have been made to the parser and semantic analysis, improving compatibility with Ethereum Solidity. seanyoung xermicus LucasSte

Changed

  • Solana: Addresses are now base58 encoded when formated with "address:{}".format(address). LucasSte
  • Substrate: No longer use the prefixed names for seal runtime API calls, which grants small improvements in contract sizes. xermicus

v0.2.3 Geneva

Added

  • The Solana units sol and lamports are now supported, e.g. 10 sol and 100 lamports. seanyoung
  • User defined operators are now supported. This is a feature in Ethereum Solidity v0.8.19. seanyoung
  • Solana: if a contract uses the SystemAccount, ClockAccount, or other standard builtin accounts, then this is automatically added to the IDL. LucasSte
  • Substrate: The content of the debug buffer is formatted in a human readable way. This vastly improves its readability, allowing to spot API runtime return codes, runtime errors and debug prints much easier. salaheldinsoliman

Fixed

  • Solana: contracts with a seed for the constructor do not require a signer in the Anchor IDL seanyoung
  • Fix panic when lexing ".9" at the beginning of a file. seanyoung
  • Forbid ABI encoding and decoding of recursive types. xermicus
  • Treat enums as 8bit uint in constant hashing. xermicus
  • Fix compilation failure with -g for the substrate target. salaheldinsoliman
  • Fixed incorrect ABI encoding for user defined types. xermicus seanyoung
  • Fixed incorrect ABI encoding for struct with fields of type bytesN xermicus
  • Fixed incorrect handling of recursive struct fields. xermicus
  • Fixed a bug in our Common Subexpression Elimination optimization pass LucasSte

Changed

  • Math overflow is now always enabled, unless the math happens with an unchecked { .. } block. The --math-overflow command line option has been removed. seanyoung
  • Substrate: the SCALE encoder and decoder now uses a much better implementation written in our CFG intermediate format. xermicus
  • Substrate: When instantiating a new contract without providing a salt, the salt we be derived from the output of the new instantiation_nonce runtime API. xermicus
  • Minimal Supported Rust Version is 1.65.0
  • No longer silently overwrite contract artifacts, if the same contract is defined more than once in different locations seanyoung

v0.2.2 Alexandria

Added

  • Solidity mappings can now have named key and named value types. seanyoung

Changed

  • Solang now uses LLVM 15. LucasSte
  • Solidity on Solana now required the Anchor framework for the client code, and the @solana/solidity.js Typescript library is no longer compatible with Solidity.
  • When casting hex literal numbers into the bytesN type, the hex literal may use leading zeros to match the size with the according bytesN, which aligns solang with solc. xermicus

Fixed

v0.2.1 Rio

Added

  • The Anchor IDL data structure is now generated for every Solana contract, although the actual IDL json file is not yet saved. LucasSte

Changed

  • The Solana target now utilizes eight byte Anchor discriminators for function dispatch instead of the four byte Ethereum selectors. LucasSte
  • The deployment of contracts on Solana now follows the same scheme as Anchor. seanyoung
  • Compares between rational literals and integers are not allowed. seanyoung
  • Overriding the function selector value is now done using the @selector([1, 2, 3, 4]) syntax, and the old syntax selector=hex"12345678" has been removed.
  • msg.sender was not implemented correctly on Solana, and has now been removed. seanyoung
  • Solang now uses LLVM 14. LucasSte

Fixed

v0.2.0 Berlin

We are happy to release solang v0.2.0 codenamed Berlin today. Aside from containing many small fixes and improvements, this release marks a milestone towards maturing our Substrate compilation target: any regressions building up since ink! v3.0 are fixed, most notably the metadata format (shoutout and many thanks to external contributor extraymond) and event topics. Furthermore, we are leaving ink! version 3 behind us, in favor of introducing compatibility with the recent ink! 4 beta release and the latest substrate contracts node v0.22.1.

Added

  • Solana / breaking: The try-catch construct is no longer permitted on Solana, as it never worked. Any CPI error will abort the transaction. seanyoung
  • Solana: Introduce new sub-command solang idl which can be used for generating a Solidity interface file from an Anchor IDL file. This can be used for calling Anchor Contracts on Solana. seanyoung
  • Substrate: Provide specific Substrate builtins via a "substrate" file. The Hash type from ink! is the first ink! specific type made available for Solidity contracts. xermicus
  • Substrate: Introduce the --log-api-return-codes CLI flag, which changes the emitted code to print return codes for seal API calls into the debug buffer. xermicus
  • Introduce function name mangling for overloaded functions and constructors, so that they can be represented properly in the metadata. xermicus

Changed

  • The Solana target now uses Borsh encoding rather than eth abi encoding. This is aimed at making Solang contracts Anchor compatible. LucasSte
  • Substrate / breaking: Supported node version is now pallet contracts v0.22.1. xermicus
  • Substrate / breaking: Remove the deprecated random builtin. xermicus

Fixed

  • Whenever possible, the parser does not give up after the first error. salaheldinsoliman
  • Constant expressions are checked for overflow. salaheldinsoliman
  • AddMod and MulMod were broken. This is now fixed. LucasSte
  • Substrate / breaking: Solang is now compatible with ink! version 4 (beta). xermicus
  • Substrate: Switched ABI generation to use official ink! crates, which fixes all remaining metadata regressions. extraymond and xermicus
  • Substrate: Allow constructors to have a name, so that multiple constructors are supported, like in ink!. xermicus
  • All provided examples as well as most of the Solidity code snippets in our documentation are now checked for succesful compilation on the Solang CI. xermicus
  • Substrate: Fix events with topics. The topic hashes generated by Solang contracts are now exactly the same as those generated by ink!. xermicus

v0.1.13 Genoa

Changed

  • Introduce sub-commands to the CLI. Now we have dedicated sub-commands for compile, doc, shell-completion and the language-server, which makes for a cleaner CLI. seanyoung
  • On Solana, emitted events are encoded with Borsh encoding following the Anchor format. LucasSte
  • The ewasm target has been removed, since ewasm is not going to implemented on Ethereum. The target has been reused for an new EVM target, which is not complete yet. seanyoung
  • Substrate: Concrete contracts must now have at least one public function. A public function is in a contract, if it has public or external functions, if it has a receive or any fallback function or if it has public storage items (those will yield public getters). This aligns solang up with ink!. xermicus

Added

  • Solana v1.11 is now supported. seanyoung
  • On Solana, programs now use a custom heap implementation, just like on Substrate. As result, it is now possible to .push() and .pop() on dynamic arrays in memory. seanyoung
  • Arithmetic overflow tests are implemented for all integer widths, salaheldinsoliman
  • Add an NFT example for Solana LucasSte
  • Add a wrapper for the Solana System Program LucasSte
  • The selector for functions can be overriden with the selector=hex"abcd0123" syntax. seanyoung
  • Shell completion is available using the solang shell-completion subcommand. xermicus
  • Add support for the create_program_address() and try_find_program_address() system call on Solana seanyoung
  • Substrate: The print() builtin is now supported and will write to the debug buffer. Additionally, error messages from the require statements will now be written to the debug buffer as well. The Substrate contracts pallet prints the contents of the debug buffer to the console for RPC ("dry-run") calls in case the runtime::contracts=debug log level is configured. xermicus

Fixed

  • DocComments /** ... */ are now permitted anywhere. seanyoung
  • Function calls to contract functions via contract name are no longer possible, except for functions of base contracts. xermicus

v0.1.12 Cairo

Added

  • Added spl-token integration for Solana
  • Solang now generates code for inline assembly, including many Yul builtins

Changed

  • The documentation has been re-arranged for readability.
  • The solang parser can parse the same syntax as Ethereum Solidity 0.8.

Fixed

  • Fixed many parser issues. Now solang-parser parses all files in the Ethereum Solidity test suite. First run git submodule update --init --recursive to fetch the test files, and then run the test with cargo test --workspace.

v0.1.11 Nuremberg

Added

  • Added support for Solidity user types
  • Support using syntax on file scope
  • Support binding functions with using
  • Implemented parsing and semantic analysis of yul (code generation is to follow)
  • The language server uses the --import and --importmap arguments
  • On Solana, it is possible to set the accounts during CPI using the accounts: call argument.

Fixed

  • Fixed associativity of the power operator
  • A huge amount of fixes improving compatibility with solc

v0.1.10 Barcelona

Added

  • On Solana, the accounts that were passed into the transactions are listed in the tx.accounts builtin. There is also a builtin struct AccountInfo
  • A new common subexpression elimination pass was added, thanks to LucasSte
  • A graphviz dot file can be generated from the ast, using --emit ast-dot
  • Many improvements to the solidity parser, and the parser has been spun out in it's own create solang-parser.

Changed

  • Solang now uses LLVM 13.0, based on the Solana LLVM tree
  • The ast datastructure has been simplified.
  • Many bugfixes across the entire tree.

v0.1.9

Added

  • Added support for solc import mapppings using --importmap
  • Added support for Events on Solana
  • msg.data, msg.sig, msg.value, block.number, and block.slot are implemented for Solana
  • Implemented balance transfers using .send() and .transfer() on Solana
  • Implemented retrieving account balances on Solana
  • Verify ed25519 signatures with signatureVerify() on Solana
  • Added support for Rational numbers
  • The address type and value type can changed using --address-length and --value-length command line arguments (for Substrate only)

Changed

  • Solana now requires v1.8.1 or later
  • On Solana, the return data is now provided in the program log. As a result, RPCs are now are now supported.
  • On the solang command line, the target must be specified.
  • The Solana instruction now includes a 64 bit value field
  • Many fixes to the parser and resolver, so solidity compatibility is much improved, thanks to sushi-shi.

Removed

  • The Sawtooth Sabre target has been removed.
  • The generic target has been removed.

v0.1.8

Added

  • Added a strength reduce pass to eliminate 256/128 bit multiply, division, and modulo where possible.
  • Visual Studio Code extension can download the Solang binary from github releases, so the user is not required to download it themselves
  • The Solana target now has support for arrays and mapping in contract storage
  • The Solana target has support for the keccak256(), ripemd160(), and sha256() builtin hash functions.
  • The Solana target has support for the builtins this and block.timestamp.
  • Implement abi.encodePacked() for the ethereum abi encoder
  • The Solana target now compiles all contracts to a single bundle.so BPF program.
  • Any unused variables, events, or contract variables are now detected and warnings are given, thanks to LucasSte
  • The immutable attribute on contract storage variables is now supported.
  • The override attribute on public contract storage variables is now supported.
  • The unchecked {} code block is now parsed and supported. Math overflow still is unsupported for types larger than 64 bit.
  • assembly {} blocks are now parsed and give a friendly error message.
  • Any variable use before it is given a value is now detected and results in a undefined variable diagnostic, thanks to LucasSte

Changed

Fixed

  • Fix a number of issues with parsing the uniswap v2 contracts
  • ewasm: staticcall() and delegatecall() cannot take value argument
  • Fixed array support in the ethereum abi encoder and decoder
  • Fixed issues in arithmetic on non-power-of-2 types (e.g. uint112)

v0.1.7

Added

  • Added a constant folding optimization pass to improve codegen. When variables fold to constant values, they are visible in the hover in the extension
  • For Substrate and Solana, address literals can specified with their base58 notation, e.g. address foo = address"5GBWmgdFAMqm8ZgAHGobqDqX6tjLxJhv53ygjNtaaAn3sjeZ";
  • Solana account storage implemented for bytes, string, and structs
  • Implemented delete for Solana

Changed

  • The Substrate target produces a single .contract file
  • The Substrate target now uses the salt argument for seal_instantiate()

Fixed

  • Libraries are allowed to have constant variables
  • Fixed ethereum abi encoding/decoding of structs and enums
  • Solana now returns an error if account data is not large enough
  • Fixed storage bytes push() and pop()
  • Ewasm uses precompiles for keccak hashing
  • Various ewasm fixes for Hyperledger Burrow

v0.1.6

Added

  • New Visual Studio Code extension developed under Hyperledger Mentorship programme
  • Added language server for use in vscode extension
  • Implemented primitives types and operations for Solana
  • Functions can be declared outside of contracts
  • Constants can be declared outside of contracts
  • String formatting using python style "..{}..".format(n)

v0.1.5

Added

  • Function types are implemented
  • An experimental Solana target has been added
  • Binaries are generated for Mac

Changed

  • The Substrate target requires Substrate 2.0

v0.1.4

Added

  • event can be declared and emitted with emit
  • Function modifiers have been implemented
  • Tags in doc comments are parsed and resolved
  • All major Solidity language features implemented, see our language status page: https://solang.readthedocs.io/en/latest/status.html

v0.1.3

Added

  • import directives are supported
  • New --importpath command line argument to specify directories to search for imports
  • Contracts can have base contracts
  • Contracts can be abstract
  • Interfaces are supported
  • Libraries are supported
  • The using library for type syntax is supported

Changed

  • Solang now uses llvm 10.0 rather than llvm 8.0
  • In line with Solidity 0.7.0, constructors no longer need a visibility argument