0.8.0_Plato_v4.2

TRON Solidity compiler 0.8.0 is fully compatible with Ethereum Solidity 0.8.0.

Breaking Changes

• Code Generator: All arithmetic is checked by default. These checks can be disabled using unchecked { ... }.
• Code Generator: Cause a panic if a byte array in storage is accessed whose length is encoded incorrectly.
• Code Generator: Use revert with error signature Panic(uint256) and error codes instead of invalid opcode on failing assertions.
• General: Enable ABI coder v2 by default.
• General: Remove global functions log0, log1, log2, log3 and log4.
• Parser: Exponentiation is right associative. a**b**c is parsed as a**(b**c).
• Type Checker: Function call options can only be given once.
• Type System: Declarations with the name this, super and _ are disallowed, with the exception of public functions and events.
• Type System: Disallow msg.data in receive() function.
• Type System: Disallow type(super).
• Type System: Disallow enums with more than 256 members.
• Type System: Disallow explicit conversions from negative literals and literals larger than type(uint160).max to address type.
• Type System: Disallow the byte type. It was an alias to bytes1.
• Type System: Explicit conversion to address type always returns a non-payable address type. In particular, address(u), address(b), address(c) and address(this) have the type address instead of address payable (Here u, b, and c are arbitrary variables of type uint160, bytes20 and contract type respectively.)
• Type System: Explicit conversions between two types are disallowed if it changes more than one of sign, width or kind at the same time.
• Type System: Explicit conversions from literals to enums are only allowed if the value fits in the enum.
• Type System: Explicit conversions from literals to integer type is as strict as implicit conversions.
  Type System: Introduce address(...).code to retrieve the code as bytes memory. The size can be obtained via address(...).code.length, but it will currently always include copying the code.
• Type System: Introduce block.chainid for retrieving the current chain id.
• Type System: Support address(...).codehash to retrieve the codehash of an account.
• Type System: The global variables tx.origin and msg.sender have type address instead of address payable.
• Type System: Unary negation can only be used on signed integers, not on unsigned integers.
• View Pure Checker: Mark chainid as view.

New Features

• Inheritance: Allow overrides to have stricter state mutability: view can override nonpayable and pure can override view.
• Parser: Deprecate visibility for constructors.
• State mutability: Do not issue recommendation for stricter mutability for virtual functions but do issue it for functions that override.

Language Feature

• Super constructors can now be called using the member notation e.g. M.C(123).

Bugfix

• Type Checker: Perform proper truncating integer arithmetic when using constants in array length expressions.

0.7.6_Plato_v4.2

TRON Solidity compiler 0.7.6 is fully compatible with Ethereum Solidity 0.7.6.

New Features

• Code generator: Support conversion from calldata slices to memory and storage arrays.
• Code generator: Support copying dynamically encoded structs from calldata to memory.
• Code generator: Support copying of nested arrays from calldata to memory.
• The fallback function can now also have a single calldata argument (equaling msg.data) and return bytes memory (which will not be ABI-encoded but returned as-is).

Compiler Features

• Build System: Optionally support dynamic loading of Z3 and use that mechanism for Linux release builds.
• Code Generator: Avoid memory allocation for default value if it is not used.

Bugfixes

• Code generator: Do not pad empty string literals with a single 32-byte zero field in the ABI coder v1.
• Type Checker: super is not available in libraries.
• Type Checker: Disallow leading zeroes in sized-types (e.g. bytes000032), but allow them to be treated as identifiers.

0.7.0_Plato_v4.2

TRON Solidity compiler 0.7.0 is fully compatible with Ethereum Solidity 0.7.0.

Breaking Changes

• Inline Assembly: Disallow . in user-defined function and variable names.
• Inline Assembly: Slot and offset of storage pointer variable x are accessed via x.slot and x.offset instead of x_slot and x_offset.
• Parser: Disallow dot syntax for value and gas.
• Parser: Remove the identifier now (replaced by block.timestamp).
• Reference Resolver: using A for B only affects the contract it is mentioned in and not all derived contracts.
• Type Checker: Disallow virtual for library functions.
• Type Checker: Disallow assignments to state variables that contain nested mappings.
• Type checker: Disallow events with same name and parameter types in inheritance hierarchy.
• Type Checker: Disallow shifts by signed types.
• Type Checker: Disallow structs and arrays in memory or calldata if they contain nested mappings.
• Type Checker: Exponentiation and shifts of literals by non-literals will always use uint256 or int256 as a type.

New Features

• Inheritance: Allow overrides to have stricter state mutability: view can override nonpayable and pure can override view.
• Parser: Deprecate visibility for constructors.
• State mutability: Do not issue recommendation for stricter mutability for virtual functions but do issue it for functions that override.

Compiler Feature

• Variable declarations using the var keyword are not recognized anymore.

Bugfixes

• Inheritance: Disallow public state variables overwriting pure functions.
• State Mutability: Constant public state variables are considered pure functions.
• Type Checker: Fixing deduction issues on function types when function call has named arguments.

0.6.12_Plato_v4.2

TRON Solidity compiler 0.6.12 is fully compatible with Ethereum Solidity 0.6.12.
Note the binary size of the solc-js increase because of the Z3 SMT solver built-in.

New Feature

• Permit calldata location for all variables.

Important Bugfix

• Fixed a bug related to internal library functions with calldata parameters called via using for.

Compiler Features

• Build system: Update the soljson.js build to emscripten 1.39.15 and boost 1.73.0 and include Z3 for integrated SMTChecker support without the callback mechanism.
• Build system: Switch the emscripten build from the fastcomp backend to the upstream backend.

Bugfixes

• Type Checker: Disallow constructor parameters with calldata data location.
• Type Checker: Do not disallow assigning to calldata variables.
• Type Checker: Fix internal error related to using for applied to non-libraries.
• Type Checker: Fix overload resolution in combination with {value: ...}.
• Type Checker: Disallow assignments to storage variables of type mapping.
• Type Checker: Disallow usage of override with non-public state variables.
• Type Checker: Fix wrong compiler error when referencing an overridden function without calling it.

0.6.8_Plato_v4.2

TRON Solidity compiler 0.6.8 is fully compatible with Ethereum Solidity 0.6.8.

New Features

• Implemented type(T).min and type(T).max for every integer type T that returns the smallest and largest value representable by the type.
• Allow using abi encoding functions for calldata array slices without explicit casts.
• Add support for TIP 165 interface identifiers with type(I).interfaceId.
• Allow virtual modifiers inside abstract contracts to have empty body.
• Allow local storage variables to be declared without initialization, as long as they are assigned before they are accessed.
• State variables can be marked immutable which causes them to be read-only, but assignable in the constructor. The value will be stored directly in the code.
• Deprecated value(...) and gas(...) in favor of {value: ...} and {gas: ...}
• Inline Assembly: Allow assigning to _slot of local storage variable pointers.

Important Bugfixes

• Add missing callvalue check to the creation code of a contract that does not define a constructor but has a base that does define a constructor.
• Disallow array slices of arrays with dynamically encoded base types.
• String literals containing backslash characters can no longer cause incorrect code to be generated when passed directly to function calls or encoding functions when ABIEncoderV2 is active.
• Fix tuple assignments with components occupying multiple stack slots and different stack size on left- and right-hand-side.
• Restrict the length of dynamic memory arrays to 64 bits during creation at runtime fixing a possible overflow.

Bugfix

• Type Checker: Disallow accessing runtimeCode for contract types that contain immutable state variables.

0.6.2_Plato_v4.2

TRON Solidity compiler 0.6.2 already supports Ethereum Solidity 0.6.2.
This release supports three new instructions introduced in TIP-157.

Requirements

• Developers can only use these new instructions after proposal TIP-157 has been approved in TRON mainnet.
• Developers can use other feature before proposal TIP-157 has been approved in TRON mainnet.

New Features

• Add FREEZE instruction: Smart contract can freeze balance to get resources or delegate resources for others.
• Add UNFREEZE instruction: Smart contract can unfreeze balance.
• Add FREEZEEXPIRETIME instruction: Smart contract can get freeze expire time, return in seconds.
• Allow accessing external functions via contract and interface names to obtain their selector.
• Allow interfaces to inherit from other interfaces.
• Allow gas and value to be set in external function calls using c.f{gas: 10000, value: 4 trx}().
• Allow specifying the salt for contract creations and thus the create2 opcode using new C{salt: 0x1234, value: 1 trx}(arg1, arg2).
• Inline Assembly: Support literals true and false.

Important Bugfixes

• Commandline interface: Only activate yul optimizer if --optimize is given.
• Fixes internal compiler error on explicitly calling unimplemented base functions.

Build System

• Switch to building soljson.js with an embedded base64-encoded wasm binary.

0.5.17_Plato_v4.2

TRON Solidity compiler 0.5.17 already supports Ethereum Solidity 0.5.17, which fixes a bug that a private function can be overridden in a derived contract by a private function of the same name and types.

This release also supports three new instructions introduced in TIP-157. These instructions will be supported in >=0.6.2.

Requirements

• Developers can only use these new instructions after proposal TIP-157 has been approved in TRON mainnet.
• Developers can use other feature before proposal TIP-157 has been approved in TRON mainnet.

New Features

• Add FREEZE instruction: Smart contract can freeze balance to get resources or delegate resources for others.
• Add UNFREEZE instruction: Smart contract can unfreeze balance.
• Add FREEZEEXPIRETIME instruction: Smart contract can get freeze expire time, return in seconds.

Important Bugfix

• Type Checker: Disallow overriding of private functions.

0.5.16_GreatVoyage_v4.1.2

New Feature

• Update to version 0.5.16 TIP-241.

Important Bugfix

• Yul Optimizer: Fix bug in redundant assignment remover in combination with break and continue statements.

0.6.0_GreatVoyage_v4.1.2

New Features

• Update to version 0.6.0 in TVM TIP-209.
• New reserved keywords: virtual, override and receive.
• Introduce virtual and override keywords and private cannot be used together with virtual.
• Abstract contracts need to be marked explicitly as abstract by using the abstract keyword.
• Split unnamed fallback functions into two cases defined using fallback() and receive().
• Introduce try/catch-statement (revert and require can be caught now, others will be supported soon).
• Introduce push() for dynamic storage arrays. It returns a reference to the newly allocated element, if applicable.
• Allow explicit conversions from address to address payable via payable(...).
• Disallow explicit conversions from external function types to address and add a member called address to them as replacement.

Changes

• ABI: Remove the deprecated constant and payable fields.
• ABI: The type field is now required and no longer specified to default to function.
• Modify push(element) for dynamic storage arrays such that it does not return the new length anymore.
• length member of arrays is now always read-only, even for storage arrays.
• Enable Yul optimizer as part of standard optimization.

Compiler Features:

• Allow revert strings to be stripped from the binary using the --revert-strings option or the settings.debug.revertStrings setting.
• Do not warn about enabled ABIEncoderV2 anymore (the pragma is still needed, though).

0.5.15_GreatVoyage_v4.1

New Feature

• Update to version 0.5.15.

Important Bugfix

• Yul Optimizer: Fix incorrect redundant load optimization crossing user-defined functions that contain for-loops with memory / storage writes.