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9705678269
solidity/Changelog.md
chriseth 9705678269 Merge pull request #3987 from ethereum/solc_remove_stdin 
BREAKING Solc: read from stdin only if "-" is explicitly given
2018-05-16 18:32:44 +02:00

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### 0.5.0 (unreleased)
Features:
Bugfixes:
Features:
Bugfixes:
### 0.4.24 (2018-05-16)
Language Features:
* Code Generator: Use native shift instructions on target Constantinople.
* General: Allow multiple variables to be declared as part of a tuple assignment, e.g. ``(uint a, uint b) = ...``.
* General: Remove deprecated ``constant`` as function state modifier from documentation and tests (but still leave it as a valid feature).
* Type Checker: Deprecate the ``years`` unit denomination and raise a warning for it (or an error as experimental 0.5.0 feature).
* Type Checker: Make literals (without explicit type casting) an error for tight packing as experimental 0.5.0 feature.
* Type Checker: Warn about wildcard tuple assignments (this will turn into an error with version 0.5.0).
* Type Checker: Warn when ``keccak256``, ``sha256`` and ``ripemd160`` are not used with a single bytes argument (suggest to use ``abi.encodePacked(...)``). This will turn into an error with version 0.5.0.
Compiler Features:
* Build System: Update internal dependency of jsoncpp to 1.8.4, which introduces more strictness and reduces memory usage.
* Control Flow Graph: Add Control Flow Graph as analysis structure.
* Control Flow Graph: Warn about returning uninitialized storage pointers.
* Gas Estimator: Only explore paths with higher gas costs. This reduces accuracy but greatly improves the speed of gas estimation.
* Optimizer: Remove unnecessary masking of the result of known short instructions (``ADDRESS``, ``CALLER``, ``ORIGIN`` and ``COINBASE``).
* Parser: Display nicer error messages by showing the actual tokens and not internal names.
* Parser: Use the entire location of the token instead of only its starting position as source location for parser errors.
* SMT Checker: Support state variables of integer and bool type.
Bugfixes:
* Code Generator: Fix ``revert`` with reason coming from a state or local string variable.
* Type Checker: Show proper error when trying to ``emit`` a non-event.
* Type Checker: Warn about empty tuple components (this will turn into an error with version 0.5.0).
* Type Checker: The ABI encoding functions are pure and thus can be used for constants.
### 0.4.23 (2018-04-19)
Features:
* Build system: Support Ubuntu Bionic.
* SMTChecker: Integration with CVC4 SMT solver
* Syntax Checker: Warn about functions named "constructor".
Bugfixes:
* Type Checker: Improve error message for failed function overload resolution.
* Type Checker: Do not complain about new-style constructor and fallback function to have the same name.
* Type Checker: Detect multiple constructor declarations in the new syntax and old syntax.
* Type Checker: Explicit conversion of ``bytesXX`` to ``contract`` is properly disallowed.
### 0.4.22 (2018-04-16)
Features:
* Code Generator: Initialize arrays without using ``msize()``.
* Code Generator: More specialized and thus optimized implementation for ``x.push(...)``
* Commandline interface: Error when missing or inaccessible file detected. Suppress it with the ``--ignore-missing`` flag.
* Constant Evaluator: Fix evaluation of single element tuples.
* General: Add encoding routines ``abi.encodePacked``, ``abi.encode``, ``abi.encodeWithSelector`` and ``abi.encodeWithSignature``.
* General: Add global function ``gasleft()`` and deprecate ``msg.gas``.
* General: Add global function ``blockhash(uint)`` and deprecate ``block.hash(uint)``.
* General: Allow providing reason string for ``revert()`` and ``require()``.
* General: Introduce new constructor syntax using the ``constructor`` keyword as experimental 0.5.0 feature.
* General: Limit the number of errors output in a single run to 256.
* General: Support accessing dynamic return data in post-byzantium EVMs.
* Inheritance: Error when using empty parentheses for base class constructors that require arguments as experimental 0.5.0 feature.
* Inheritance: Error when using no parentheses in modifier-style constructor calls as experimental 0.5.0 feature.
* Interfaces: Allow overriding external functions in interfaces with public in an implementing contract.
* Optimizer: Optimize ``SHL`` and ``SHR`` only involving constants (Constantinople only).
* Optimizer: Remove useless ``SWAP1`` instruction preceding a commutative instruction (such as ``ADD``, ``MUL``, etc).
* Optimizer: Replace comparison operators (``LT``, ``GT``, etc) with opposites if preceded by ``SWAP1``, e.g. ``SWAP1 LT`` is replaced with ``GT``.
* Optimizer: Optimize across ``mload`` if ``msize()`` is not used.
* Static Analyzer: Error on duplicated super constructor calls as experimental 0.5.0 feature.
* Syntax Checker: Issue warning for empty structs (or error as experimental 0.5.0 feature).
* Syntax Checker: Warn about modifiers on functions without implementation (this will turn into an error with version 0.5.0).
* Syntax Tests: Add source locations to syntax test expectations.
* Type Checker: Improve documentation and warnings for accessing contract members inherited from ``address``.
Bugfixes:
* Code Generator: Allow ``block.blockhash`` without being called.
* Code Generator: Do not include internal functions in the runtime bytecode which are only referenced in the constructor.
* Code Generator: Properly skip unneeded storage array cleanup when not reducing length.
* Code Generator: Bugfix in modifier lookup in libraries.
* Code Generator: Implement packed encoding of external function types.
* Code Generator: Treat empty base constructor argument list as not provided.
* Code Generator: Properly force-clean bytesXX types for shortening conversions.
* Commandline interface: Fix error messages for imported files that do not exist.
* Commandline interface: Support ``--evm-version constantinople`` properly.
* DocString Parser: Fix error message for empty descriptions.
* Gas Estimator: Correctly ignore costs of fallback function for other functions.
* JSON AST: Remove storage qualifier for type name strings.
* Parser: Fix internal compiler error when parsing ``var`` declaration without identifier.
* Parser: Fix parsing of getters for function type variables.
* Standard JSON: Support ``constantinople`` as ``evmVersion`` properly.
* Static Analyzer: Fix non-deterministic order of unused variable warnings.
* Static Analyzer: Invalid arithmetic with constant expressions causes errors.
* Type Checker: Fix detection of recursive structs.
* Type Checker: Fix asymmetry bug when comparing with literal numbers.
* Type System: Improve error message when attempting to shift by a fractional amount.
* Type System: Make external library functions accessible.
* Type System: Prevent encoding of weird types.
* Type System: Restrict rational numbers to 4096 bits.
### 0.4.21 (2018-03-07)
Features:
* Code Generator: Assert that ``k != 0`` for ``mulmod(a, b, k)`` and ``addmod(a, b, k)`` as experimental 0.5.0 feature.
* Code Generator: Do not retain any gas in calls (except if EVM version is set to homestead).
* Code Generator: Use ``STATICCALL`` opcode for calling ``view`` and ``pure`` functions as experimenal 0.5.0 feature.
* General: C99/C++-style scoping rules (instead of JavaScript function scoping) take effect as experimental v0.5.0 feature.
* General: Improved messaging when error spans multiple lines of a sourcefile
* General: Support and recommend using ``emit EventName();`` to call events explicitly.
* Inline Assembly: Enforce strict mode as experimental 0.5.0 feature.
* Interface: Provide ability to select target EVM version (homestead or byzantium, with byzantium being the default).
* Standard JSON: Reject badly formatted invalid JSON inputs.
* Type Checker: Disallow uninitialized storage pointers as experimental 0.5.0 feature.
* Syntax Analyser: Do not warn about experimental features if they do not concern code generation.
* Syntax Analyser: Do not warn about ``pragma experimental "v0.5.0"`` and do not set the experimental flag in the bytecode for this.
* Syntax Checker: Mark ``throw`` as an error as experimental 0.5.0 feature.
* Syntax Checker: Issue error if no visibility is specified on contract functions as experimental 0.5.0 feature.
* Syntax Checker: Issue warning when using overloads of ``address`` on contract instances.
* Type Checker: disallow combining hex numbers and unit denominations as experimental 0.5.0 feature.
Bugfixes:
* Assembly: Raise error on oversized number literals in assembly.
* JSON-AST: Add "documentation" property to function, event and modifier definition.
* Resolver: Properly determine shadowing for imports with aliases.
* Standalone Assembly: Do not ignore input after closing brace of top level block.
* Standard JSON: Catch errors properly when invalid "sources" are passed.
* Standard JSON: Ensure that library addresses supplied are of correct length and hex prefixed.
* Type Checker: Properly detect which array and struct types are unsupported by the old ABI encoder.
* Type Checker: Properly warn when using ``_offset`` and ``_slot`` for constants in inline assembly.
* Commandline interface: throw error if option is unknown
### 0.4.20 (2018-02-14)
Features:
* Code Generator: Prevent non-view functions in libraries from being called
directly (as opposed to via delegatecall).
* Commandline interface: Support strict mode of assembly (disallowing jumps,
instructional opcodes, etc) with the ``--strict-assembly`` switch.
* Inline Assembly: Issue warning for using jump labels (already existed for jump instructions).
* Inline Assembly: Support some restricted tokens (return, byte, address) as identifiers in Iulia mode.
* Optimiser: Replace ``x % 2**i`` by ``x & (2**i-1)``.
* Resolver: Continue resolving references after the first error.
* Resolver: Suggest alternative identifiers if a given identifier is not found.
* SMT Checker: Take if-else branch conditions into account in the SMT encoding of the program
variables.
* Syntax Checker: Deprecate the ``var`` keyword (and mark it an error as experimental 0.5.0 feature).
* Type Checker: Allow `this.f.selector` to be a pure expression.
* Type Checker: Issue warning for using ``public`` visibility for interface functions.
* Type Checker: Limit the number of warnings raised for creating abstract contracts.
Bugfixes:
* Error Output: Truncate huge number literals in the middle to avoid output blow-up.
* Parser: Disallow event declarations with no parameter list.
* Standard JSON: Populate the ``sourceLocation`` field in the error list.
* Standard JSON: Properly support contract and library file names containing a colon (such as URLs).
* Type Checker: Suggest the experimental ABI encoder if using ``struct``s as function parameters
(instead of an internal compiler error).
* Type Checker: Improve error message for wrong struct initialization.
### 0.4.19 (2017-11-30)
Features:
* Code Generator: New ABI decoder which supports structs and arbitrarily nested
arrays and checks input size (activate using ``pragma experimental ABIEncoderV2;``).
* General: Allow constant variables to be used as array length.
* Inline Assembly: ``if`` statement.
* Standard JSON: Support the ``outputSelection`` field for selective compilation of target artifacts.
* Syntax Checker: Turn the usage of ``callcode`` into an error as experimental 0.5.0 feature.
* Type Checker: Improve address checksum warning.
* Type Checker: More detailed errors for invalid array lengths (such as division by zero).
Bugfixes:
### 0.4.18 (2017-10-18)
Features:
* Code Generator: Always use all available gas for calls as experimental 0.5.0 feature
(previously, some amount was retained in order to work in pre-Tangerine-Whistle
EVM versions)
* Parser: Better error message for unexpected trailing comma in parameter lists.
* Standard JSON: Support the ``outputSelection`` field for selective compilation of supplied sources.
* Syntax Checker: Unary ``+`` is now a syntax error as experimental 0.5.0 feature.
* Type Checker: Disallow non-pure constant state variables as experimental 0.5.0 feature.
* Type Checker: Do not add members of ``address`` to contracts as experimental 0.5.0 feature.
* Type Checker: Force interface functions to be external as experimental 0.5.0 feature.
* Type Checker: Require ``storage`` or ``memory`` keyword for local variables as experimental 0.5.0 feature.
* Compiler Interface: Better formatted error message for long source snippets
Bugfixes:
* Code Generator: Allocate one byte per memory byte array element instead of 32.
* Code Generator: Do not accept data with less than four bytes (truncated function
signature) for regular function calls - fallback function is invoked instead.
* Optimizer: Remove unused stack computation results.
* Parser: Fix source location of VariableDeclarationStatement.
* Type Checker: Allow ``gas`` in view functions.
* Type Checker: Do not mark event parameters as shadowing state variables.
* Type Checker: Prevent duplicate event declarations.
* Type Checker: Properly check array length and don't rely on an assertion in code generation.
* Type Checker: Properly support overwriting members inherited from ``address`` in a contract
(such as ``balance``, ``transfer``, etc.)
* Type Checker: Validate each number literal in tuple expressions even if they are not assigned from.
### 0.4.17 (2017-09-21)
Features:
* Assembly Parser: Support multiple assignment (``x, y := f()``).
* Code Generator: Keep a single copy of encoding functions when using the experimental "ABIEncoderV2".
* Code Generator: Partial support for passing ``structs`` as arguments and return parameters (requires ``pragma experimental ABIEncoderV2;`` for now).
* General: Support ``pragma experimental "v0.5.0";`` to activate upcoming breaking changes.
* General: Added ``.selector`` member on external function types to retrieve their signature.
* Optimizer: Add new optimization step to remove unused ``JUMPDEST``s.
* Static Analyzer: Warn when using deprecated builtins ``sha3`` and ``suicide``
(replaced by ``keccak256`` and ``selfdestruct``, introduced in 0.4.2 and 0.2.0, respectively).
* Syntax Checker: Warn if no visibility is specified on contract functions.
* Type Checker: Display helpful warning for unused function arguments/return parameters.
* Type Checker: Do not show the same error multiple times for events.
* Type Checker: Greatly reduce the number of duplicate errors shown for duplicate constructors and functions.
* Type Checker: Warn on using literals as tight packing parameters in ``keccak256``, ``sha3``, ``sha256`` and ``ripemd160``.
* Type Checker: Enforce ``view`` and ``pure``.
* Type Checker: Enforce ``view`` / ``constant`` with error as experimental 0.5.0 feature.
* Type Checker: Enforce fallback functions to be ``external`` as experimental 0.5.0 feature.
Bugfixes:
* ABI JSON: Include all overloaded events.
* Parser: Crash fix related to parseTypeName.
* Type Checker: Allow constant byte arrays.
### 0.4.16 (2017-08-24)
Features:
* ABI JSON: Include new field ``stateMutability`` with values ``pure``, ``view``,
``nonpayable`` and ``payable``.
* Analyzer: Experimental partial support for Z3 SMT checker ("SMTChecker").
* Build System: Shared libraries (``libdevcore``, ``libevmasm``, ``libsolidity``
and ``liblll``) are no longer produced during the build process.
* Code generator: Experimental new implementation of ABI encoder that can
encode arbitrarily nested arrays ("ABIEncoderV2")
* Metadata: Store experimental flag in metadata CBOR.
* Parser: Display previous visibility specifier in error if multiple are found.
* Parser: Introduce ``pure`` and ``view`` keyword for functions,
``constant`` remains an alias for ``view`` and pureness is not enforced yet,
so use with care.
* Static Analyzer: Warn about large storage structures.
* Syntax Checker: Support ``pragma experimental <feature>;`` to turn on
experimental features.
* Type Checker: More detailed error message for invalid overrides.
* Type Checker: Warn about shifting a literal.
Bugfixes:
* Assembly Parser: Be more strict about number literals.
* Assembly Parser: Limit maximum recursion depth.
* Parser: Enforce commas between array and tuple elements.
* Parser: Limit maximum recursion depth.
* Type Checker: Crash fix related to ``using``.
* Type Checker: Disallow constructors in libraries.
* Type Checker: Reject the creation of interface contracts using the ``new`` statement.
### 0.4.15 (2017-08-08)
Features:
* Type Checker: Show unimplemented function if trying to instantiate an abstract class.
Bugfixes:
* Code Generator: ``.delegatecall()`` should always return execution outcome.
* Code Generator: Provide "new account gas" for low-level ``callcode`` and ``delegatecall``.
* Type Checker: Constructors must be implemented if declared.
* Type Checker: Disallow the ``.gas()`` modifier on ``ecrecover``, ``sha256`` and ``ripemd160``.
* Type Checker: Do not mark overloaded functions as shadowing other functions.
* Type Checker: Internal library functions must be implemented if declared.
### 0.4.14 (2017-07-31)
Features:
* C API (``jsonCompiler``): Export the ``license`` method.
* Code Generator: Optimise the fallback function, by removing a useless jump.
* Inline Assembly: Show useful error message if trying to access calldata variables.
* Inline Assembly: Support variable declaration without initial value (defaults to 0).
* Metadata: Only include files which were used to compile the given contract.
* Type Checker: Disallow value transfers to contracts without a payable fallback function.
* Type Checker: Include types in explicit conversion error message.
* Type Checker: Raise proper error for arrays too large for ABI encoding.
* Type checker: Warn if using ``this`` in a constructor.
* Type checker: Warn when existing symbols, including builtins, are overwritten.
Bugfixes:
* Code Generator: Properly clear return memory area for ecrecover.
* Type Checker: Fix crash for some assignment to non-lvalue.
* Type Checker: Fix invalid "specify storage keyword" warning for reference members of structs.
* Type Checker: Mark modifiers as internal.
* Type Checker: Re-allow multiple mentions of the same modifier per function.
### 0.4.13 (2017-07-06)
Features:
* Syntax Checker: Deprecated "throw" in favour of require(), assert() and revert().
* Type Checker: Warn if a local storage reference variable does not explicitly use the keyword ``storage``.
Bugfixes:
* Code Generator: Correctly unregister modifier variables.
* Compiler Interface: Only output AST if analysis was successful.
* Error Output: Do not omit the error type.
### 0.4.12 (2017-07-03)
Features:
* Assembly: Add ``CREATE2`` (EIP86), ``STATICCALL`` (EIP214), ``RETURNDATASIZE`` and ``RETURNDATACOPY`` (EIP211) instructions.
* Assembly: Display auxiliary data in the assembly output.
* Assembly: Renamed ``SHA3`` to ``KECCAK256``.
* AST: export all attributes to JSON format.
* C API (``jsonCompiler``): Use the Standard JSON I/O internally.
* Code Generator: Added the Whiskers template system.
* Inline Assembly: ``for`` and ``switch`` statements.
* Inline Assembly: Function definitions and function calls.
* Inline Assembly: Introduce ``keccak256`` as an opcode. ``sha3`` is still a valid alias.
* Inline Assembly: Present proper error message when not supplying enough arguments to a functional
instruction.
* Inline Assembly: Warn when instructions shadow Solidity variables.
* Inline Assembly: Warn when using ``jump``s.
* Remove obsolete Why3 output.
* Type Checker: Enforce strict UTF-8 validation.
* Type Checker: Warn about copies in storage that might overwrite unexpectedly.
* Type Checker: Warn about type inference from literal numbers.
* Static Analyzer: Warn about deprecation of ``callcode``.
Bugfixes:
* Assembly: mark ``MLOAD`` to have side effects in the optimiser.
* Code Generator: Fix ABI encoding of empty literal string.
* Code Generator: Fix negative stack size checks.
* Code generator: Use ``REVERT`` instead of ``INVALID`` for generated input validation routines.
* Inline Assembly: Enforce function arguments when parsing functional instructions.
* Optimizer: Disallow optimizations involving ``MLOAD`` because it changes ``MSIZE``.
* Static Analyzer: Unused variable warnings no longer issued for variables used inside inline assembly.
* Type Checker: Fix address literals not being treated as compile-time constants.
* Type Checker: Fixed crash concerning non-callable types.
* Type Checker: Fixed segfault with constant function parameters
* Type Checker: Disallow comparisons between mapping and non-internal function types.
* Type Checker: Disallow invoking the same modifier multiple times.
* Type Checker: Do not treat strings that look like addresses as addresses.
* Type Checker: Support valid, but incorrectly rejected UTF-8 sequences.
### 0.4.11 (2017-05-03)
Features:
* Implement the Standard JSON Input / Output API
* Support ``interface`` contracts.
* C API (``jsonCompiler``): Add the ``compileStandard()`` method to process a Standard JSON I/O.
* Commandline interface: Add the ``--standard-json`` parameter to process a Standard JSON I/O.
* Commandline interface: Support ``--allow-paths`` to define trusted import paths. Note: the
path(s) of the supplied source file(s) is always trusted.
* Inline Assembly: Storage variable access using ``_slot`` and ``_offset`` suffixes.
* Inline Assembly: Disallow blocks with unbalanced stack.
* Static analyzer: Warn about statements without effects.
* Static analyzer: Warn about unused local variables, parameters, and return parameters.
* Syntax checker: issue deprecation warning for unary '+'
Bugfixes:
* Assembly output: Implement missing AssemblyItem types.
* Compiler interface: Fix a bug where source indexes could be inconsistent between Solidity compiled
with different compilers (clang vs. gcc) or compiler settings. The bug was visible in AST
and source mappings.
* Gas Estimator: Reflect the most recent fee schedule.
* Type system: Contract inheriting from base with unimplemented constructor should be abstract.
* Optimizer: Number representation bug in the constant optimizer fixed.
### 0.4.10 (2017-03-15)
Features:
* Add ``assert(condition)``, which throws if condition is false (meant for internal errors).
* Add ``require(condition)``, which throws if condition is false (meant for invalid input).
* Commandline interface: Do not overwrite files unless forced.
* Introduce ``.transfer(value)`` for sending Ether.
* Code generator: Support ``revert()`` to abort with rolling back, but not consuming all gas.
* Inline assembly: Support ``revert`` (EIP140) as an opcode.
* Parser: Support scientific notation in numbers (e.g. ``2e8`` and ``200e-2``).
* Type system: Support explicit conversion of external function to address.
* Type system: Warn if base of exponentiation is literal (result type might be unexpected).
* Type system: Warn if constant state variables are not compile-time constants.
Bugfixes:
* Commandline interface: Always escape filenames (replace ``/``, ``:`` and ``.`` with ``_``).
* Commandline interface: Do not try creating paths ``.`` and ``..``.
* Commandline interface: Allow long library names.
* Parser: Disallow octal literals.
* Type system: Fix a crash caused by continuing on fatal errors in the code.
* Type system: Disallow compound assignment for tuples.
* Type system: Detect cyclic dependencies between constants.
* Type system: Disallow arrays with negative length.
* Type system: Fix a crash related to invalid binary operators.
* Type system: Disallow ``var`` declaration with empty tuple type.
* Type system: Correctly convert function argument types to pointers for member functions.
* Type system: Move privateness of constructor into AST itself.
* Inline assembly: Charge one stack slot for non-value types during analysis.
* Assembly output: Print source location before the operation it refers to instead of after.
* Optimizer: Stop trying to optimize tricky constants after a while.
### 0.4.9 (2017-01-31)
Features:
* Compiler interface: Contracts and libraries can be referenced with a ``file:`` prefix to make them unique.
* Compiler interface: Report source location for "stack too deep" errors.
* AST: Use deterministic node identifiers.
* Inline assembly: introduce ``invalid`` (EIP141) as an opcode.
* Type system: Introduce type identifier strings.
* Type checker: Warn about invalid checksum for addresses and deduce type from valid ones.
* Metadata: Do not include platform in the version number.
* Metadata: Add option to store sources as literal content.
* Code generator: Extract array utils into low-level functions.
* Code generator: Internal errors (array out of bounds, etc.) now cause a reversion by using an invalid
instruction (0xfe - EIP141) instead of an invalid jump. Invalid jump is still kept for explicit throws.
Bugfixes:
* Code generator: Allow recursive structs.
* Inline assembly: Disallow variables named like opcodes.
* Type checker: Allow multiple events of the same name (but with different arities or argument types)
* Natspec parser: Fix error with ``@param`` parsing and whitespace.
### 0.4.8 (2017-01-13)
Features:
* Optimiser: Performance improvements.
* Output: Print assembly in new standardized Solidity assembly format.
Bugfixes:
* Remappings: Prefer longer context over longer prefix.
* Type checker, code generator: enable access to events of base contracts' names.
* Imports: ``import ".dir/a"`` is not a relative path. Relative paths begin with directory ``.`` or ``..``.
* Type checker, disallow inheritances of different kinds (e.g. a function and a modifier) of members of the same name
### 0.4.7 (2016-12-15)
Features:
* Bitshift operators.
* Type checker: Warn when ``msg.value`` is used in non-payable function.
* Code generator: Inject the Swarm hash of a metadata file into the bytecode.
* Code generator: Replace expensive memcpy precompile by simple assembly loop.
* Optimizer: Some dead code elimination.
Bugfixes:
* Code generator: throw if calling the identity precompile failed during memory (array) copying.
* Type checker: string literals that are not valid UTF-8 cannot be converted to string type
* Code generator: any non-zero value given as a boolean argument is now converted into 1.
* AST Json Converter: replace ``VariableDefinitionStatement`` nodes with ``VariableDeclarationStatement``
* AST Json Converter: fix the camel case in ``ElementaryTypeNameExpression``
* AST Json Converter: replace ``public`` field with ``visibility`` in the function definition nodes
### 0.4.6 (2016-11-22)
Bugfixes:
* Optimizer: Knowledge about state was not correctly cleared for JUMPDESTs (introduced in 0.4.5)
### 0.4.5 (2016-11-21)
Features:
* Function types
* Do-while loops: support for a ``do <block> while (<expr>);`` control structure
* Inline assembly: support ``invalidJumpLabel`` as a jump label.
* Type checker: now more eagerly searches for a common type of an inline array with mixed types
* Code generator: generates a runtime error when an out-of-range value is converted into an enum type.
Bugfixes:
* Inline assembly: calculate stack height warning correctly even when local variables are used.
* Code generator: check for value transfer in non-payable constructors.
* Parser: disallow empty enum definitions.
* Type checker: disallow conversion between different enum types.
* Interface JSON: do not include trailing new line.
### 0.4.4 (2016-10-31)
Bugfixes:
* Type checker: forbid signed exponential that led to an incorrect use of EXP opcode.
* Code generator: properly clean higher order bytes before storing in storage.
### 0.4.3 (2016-10-25)
Features:
* Inline assembly: support both ``suicide`` and ``selfdestruct`` opcodes
(note: ``suicide`` is deprecated).
* Inline assembly: issue warning if stack is not balanced after block.
* Include ``keccak256()`` as an alias to ``sha3()``.
* Support shifting constant numbers.
Bugfixes:
* Commandline interface: Disallow unknown options in ``solc``.
* Name resolver: Allow inheritance of ``enum`` definitions.
* Type checker: Proper type checking for bound functions.
* Type checker: fixed crash related to invalid fixed point constants
* Type checker: fixed crash related to invalid literal numbers.
* Type checker: ``super.x`` does not look up ``x`` in the current contract.
* Code generator: expect zero stack increase after ``super`` as an expression.
* Code generator: fix an internal compiler error for ``L.Foo`` for ``enum Foo`` defined in library ``L``.
* Code generator: allow inheritance of ``enum`` definitions.
* Inline assembly: support the ``address`` opcode.
* Inline assembly: fix parsing of assignment after a label.
* Inline assembly: external variables of unsupported type (such as ``this``, ``super``, etc.)
are properly detected as unusable.
* Inline assembly: support variables within modifiers.
* Optimizer: fix related to stale knowledge about SHA3 operations
### 0.4.2 (2016-09-17)
Bugfixes:
* Code Generator: Fix library functions being called from payable functions.
* Type Checker: Fixed a crash about invalid array types.
* Code Generator: Fixed a call gas bug that became visible after
version 0.4.0 for calls where the output is larger than the input.
### 0.4.1 (2016-09-09)
* Build System: Fixes to allow library compilation.
### 0.4.0 (2016-09-08)
This release deliberately breaks backwards compatibility mostly to
enforce some safety features. The most important change is that you have
to explicitly specify if functions can receive ether via the ``payable``
modifier. Furthermore, more situations cause exceptions to be thrown.
Minimal changes to be made for upgrade:
- Add ``payable`` to all functions that want to receive Ether
(including the constructor and the fallback function).
- Change ``_`` to ``_;`` in modifiers.
- Add version pragma to each file: ``pragma solidity ^0.4.0;``
Breaking Changes:
* Source files have to specify the compiler version they are
compatible with using e.g. ``pragma solidity ^0.4.0;`` or
``pragma solidity >=0.4.0 <0.4.8;``
* Functions that want to receive Ether have to specify the
new ``payable`` modifier (otherwise they throw).
* Contracts that want to receive Ether with a plain "send"
have to implement a fallback function with the ``payable``
modifier. Contracts now throw if no payable fallback
function is defined and no function matches the signature.
* Failing contract creation through "new" throws.
* Division / modulus by zero throws.
* Function call throws if target contract does not have code
* Modifiers are required to contain ``_`` (use ``if (false) _`` as a workaround if needed).
* Modifiers: return does not skip part in modifier after ``_``.
* Placeholder statement `_` in modifier now requires explicit `;`.
* ``ecrecover`` now returns zero if the input is malformed (it previously returned garbage).
* The ``constant`` keyword cannot be used for constructors or the fallback function.
* Removed ``--interface`` (Solidity interface) output option
* JSON AST: General cleanup, renamed many nodes to match their C++ names.
* JSON output: ``srcmap-runtime`` renamed to ``srcmapRuntime``.
* Moved (and reworked) standard library contracts from inside the compiler to github.com/ethereum/solidity/std
(``import "std";`` or ``import owned;`` do not work anymore).
* Confusing and undocumented keyword ``after`` was removed.
* New reserved words: ``abstract``, ``hex``, ``interface``, ``payable``, ``pure``, ``static``, ``view``.
Features:
* Hexadecimal string literals: ``hex"ab1248fe"``
* Internal: Inline assembly usable by the code generator.
* Commandline interface: Using ``-`` as filename allows reading from stdin.
* Interface JSON: Fallback function is now part of the ABI.
* Interface: Version string now *semver* compatible.
* Code generator: Do not provide "new account gas" if we know the called account exists.
Bugfixes:
* JSON AST: Nodes were added at wrong parent
* Why3 translator: Crash fix for exponentiation
* Commandline Interface: linking libraries with underscores in their name.
* Type Checker: Fallback function cannot return data anymore.
* Code Generator: Fix crash when ``sha3()`` was used on unsupported types.
* Code Generator: Manually set gas stipend for ``.send(0)``.
Lots of changes to the documentation mainly by voluntary external contributors.
### 0.3.6 (2016-08-10)
Features:
* Formal verification: Take external effects on a contract into account.
* Type Checker: Warning about unused return value of low-level calls and send.
* Output: Source location and node id as part of AST output
* Output: Source location mappings for bytecode
* Output: Formal verification as part of json compiler output.
Bugfixes:
* Commandline Interface: Do not crash if input is taken from stdin.
* Scanner: Correctly support unicode escape codes in strings.
* JSON output: Fix error about relative / absolute source file names.
* JSON output: Fix error about invalid utf8 strings.
* Code Generator: Dynamic allocation of empty array caused infinite loop.
* Code Generator: Correctly calculate gas requirements for memcpy precompile.
* Optimizer: Clear known state if two code paths are joined.
### 0.3.5 (2016-06-10)
Features:
* Context-dependent path remappings (different modules can use the same library in different versions)
Bugfixes:
* Type Checking: Dynamic return types were removed when fetching data from external calls, now they are replaced by an "unusable" type.
* Type Checking: Overrides by constructors were considered making a function non-abstract.
### 0.3.4 (2016-05-31)
No change outside documentation.
### 0.3.3 (2016-05-27)
* Allow internal library functions to be called (by "inlining")
* Fractional/rational constants (only usable with fixed point types, which are still in progress)
* Inline assembly has access to internal functions (as jump labels)
* Running `solc` without arguments on a terminal will print help.
* Bugfix: Remove some non-determinism in code generation.
* Bugfix: Corrected usage of not / bnot / iszero in inline assembly
* Bugfix: Correctly clean bytesNN types before comparison
### 0.3.2 (2016-04-18)
* Bugfix: Inline assembly parser: `byte` opcode was unusable
* Bugfix: Error reporting: tokens for variably-sized types were not converted to string properly
* Bugfix: Dynamic arrays of structs were not deleted correctly.
* Bugfix: Static arrays in constructor parameter list were not decoded correctly.
### 0.3.1 (2016-03-31)
* Inline assembly
* Bugfix: Code generation: array access with narrow types did not clean higher order bits
* Bugfix: Error reporting: error reporting with unknown source location caused a crash
### 0.3.0 (2016-03-11)
BREAKING CHANGES:
* Added new keywords `assembly`, `foreign`, `fixed`, `ufixed`, `fixedNxM`, `ufixedNxM` (for various values of M and N), `timestamp`
* Number constant division does not round to integer, but to a fixed point type (e.g. `1 / 2 != 1`, but `1 / 2 == 0.5`).
* Library calls now default to use DELEGATECALL (e.g. called library functions see the same value as the calling function for `msg.value` and `msg.sender`).
* `<address>.delegatecall` as a low-level calling interface
Bugfixes:
* Fixed a bug in the optimizer that resulted in comparisons being wrong.
### 0.2.2 (2016-02-17)
* Index access for types `bytes1`, ..., `bytes32` (only read access for now).
* Bugfix: Type checker crash for wrong number of base constructor parameters.
### 0.2.1 (2016-01-30)
* Inline arrays, i.e. `var y = [1,x,f()];` if there is a common type for `1`, `x` and `f()`. Note that the result is always a fixed-length memory array and conversion to dynamic-length memory arrays is not yet possible.
* Import similar to ECMAScript6 import (`import "abc.sol" as d` and `import {x, y} from "abc.sol"`).
* Commandline compiler solc automatically resolves missing imports and allows for "include directories".
* Conditional: `x ? y : z`
* Bugfix: Fixed several bugs where the optimizer generated invalid code.
* Bugfix: Enums and structs were not accessible to other contracts.
* Bugfix: Fixed segfault connected to function paramater types, appeared during gas estimation.
* Bugfix: Type checker crash for wrong number of base constructor parameters.
* Bugfix: Allow function overloads with different array types.
* Bugfix: Allow assignments of type `(x) = 7`.
* Bugfix: Type `uint176` was not available.
* Bugfix: Fixed crash during type checking concerning constructor calls.
* Bugfix: Fixed crash during code generation concerning invalid accessors for struct types.
* Bugfix: Fixed crash during code generating concerning computing a hash of a struct type.
### 0.2.0 (2015-12-02)
* **Breaking Change**: `new ContractName.value(10)()` has to be written as `(new ContractName).value(10)()`
* Added `selfdestruct` as an alias for `suicide`.
* Allocation of memory arrays using `new`.
* Binding library functions to types via `using x for y`
* `addmod` and `mulmod` (modular addition and modular multiplication with arbitrary intermediate precision)
* Bugfix: Constructor arguments of fixed array type were not read correctly.
* Bugfix: Memory allocation of structs containing arrays or strings.
* Bugfix: Data location for explicit memory parameters in libraries was set to storage.
### 0.1.7 (2015-11-17)
* Improved error messages for unexpected tokens.
* Proof-of-concept transcompilation to why3 for formal verification of contracts.
* Bugfix: Arrays (also strings) as indexed parameters of events.
* Bugfix: Writing to elements of `bytes` or `string` overwrite others.
* Bugfix: "Successor block not found" on Windows.
* Bugfix: Using string literals in tuples.
* Bugfix: Cope with invalid commit hash in version for libraries.
* Bugfix: Some test framework fixes on windows.
### 0.1.6 (2015-10-16)
* `.push()` for dynamic storage arrays.
* Tuple expressions (`(1,2,3)` or `return (1,2,3);`)
* Declaration and assignment of multiple variables (`var (x,y,) = (1,2,3,4,5);` or `var (x,y) = f();`)
* Destructuring assignment (`(x,y,) = (1,2,3)`)
* Bugfix: Internal error about usage of library function with invalid types.
* Bugfix: Correctly parse `Library.structType a` at statement level.
* Bugfix: Correctly report source locations of parenthesized expressions (as part of "tuple" story).
### 0.1.5 (2015-10-07)
* Breaking change in storage encoding: Encode short byte arrays and strings together with their length in storage.
* Report warnings
* Allow storage reference types for public library functions.
* Access to types declared in other contracts and libraries via `.`.
* Version stamp at beginning of runtime bytecode of libraries.
* Bugfix: Problem with initialized string state variables and dynamic data in constructor.
* Bugfix: Resolve dependencies concerning `new` automatically.
* Bugfix: Allow four indexed arguments for anonymous events.
* Bugfix: Detect too large integer constants in functions that accept arbitrary parameters.
### 0.1.4 (2015-09-30)
* Bugfix: Returning fixed-size arrays.
* Bugfix: combined-json output of solc.
* Bugfix: Accessing fixed-size array return values.
* Bugfix: Disallow assignment from literal strings to storage pointers.
* Refactoring: Move type checking into its own module.
### 0.1.3 (2015-09-25)
* `throw` statement.
* Libraries that contain functions which are called via CALLCODE.
* Linker stage for compiler to insert other contract's addresses (used for libraries).
* Compiler option to output runtime part of contracts.
* Compile-time out of bounds check for access to fixed-size arrays by integer constants.
* Version string includes libevmasm/libethereum's version (contains the optimizer).
* Bugfix: Accessors for constant public state variables.
* Bugfix: Propagate exceptions in clone contracts.
* Bugfix: Empty single-line comments are now treated properly.
* Bugfix: Properly check the number of indexed arguments for events.
* Bugfix: Strings in struct constructors.
### 0.1.2 (2015-08-20)
* Improved commandline interface.
* Explicit conversion between `bytes` and `string`.
* Bugfix: Value transfer used in clone contracts.
* Bugfix: Problem with strings as mapping keys.
* Bugfix: Prevent usage of some operators.
### 0.1.1 (2015-08-04)
* Strings can be used as mapping keys.
* Clone contracts.
* Mapping members are skipped for structs in memory.
* Use only a single stack slot for storage references.
* Improved error message for wrong argument count. (#2456)
* Bugfix: Fix comparison between `bytesXX` types. (#2087)
* Bugfix: Do not allow floats for integer literals. (#2078)
* Bugfix: Some problem with many local variables. (#2478)
* Bugfix: Correctly initialise `string` and `bytes` state variables.
* Bugfix: Correctly compute gas requirements for callcode.
### 0.1.0 (2015-07-10)
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