mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
287 lines
12 KiB
C++
287 lines
12 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Component that can generate various useful Yul functions.
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*/
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#pragma once
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#include <liblangutil/EVMVersion.h>
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#include <libsolidity/codegen/MultiUseYulFunctionCollector.h>
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#include <memory>
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#include <string>
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#include <vector>
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namespace dev
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{
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namespace solidity
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{
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class Type;
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class ArrayType;
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class MappingType;
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class IntegerType;
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/**
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* Component that can generate various useful Yul functions.
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*/
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class YulUtilFunctions
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{
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public:
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explicit YulUtilFunctions(
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langutil::EVMVersion _evmVersion,
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std::shared_ptr<MultiUseYulFunctionCollector> _functionCollector
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):
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m_evmVersion(_evmVersion),
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m_functionCollector(std::move(_functionCollector))
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{}
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/// @returns a function that combines the address and selector to a single value
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/// for use in the ABI.
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std::string combineExternalFunctionIdFunction();
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/// @returns a function that splits the address and selector from a single value
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/// for use in the ABI.
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std::string splitExternalFunctionIdFunction();
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/// @returns a function that copies raw bytes of dynamic length from calldata
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/// or memory to memory.
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/// Pads with zeros and might write more than exactly length.
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std::string copyToMemoryFunction(bool _fromCalldata);
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// @returns the name of a function that has the equivalent logic of an
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// `assert` or `require` call.
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std::string requireOrAssertFunction(bool _assert, Type const* _messageType = nullptr);
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/// @returns the name of a function that takes a (cleaned) value of the given value type and
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/// left-aligns it, usually for use in non-padded encoding.
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std::string leftAlignFunction(Type const& _type);
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std::string shiftLeftFunction(size_t _numBits);
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std::string shiftLeftFunctionDynamic();
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std::string shiftRightFunction(size_t _numBits);
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std::string shiftRightFunctionDynamic();
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/// @returns the name of a function which replaces the
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/// _numBytes bytes starting at byte position _shiftBytes (counted from the least significant
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/// byte) by the _numBytes least significant bytes of `toInsert`.
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/// signature: (value, toInsert) -> result
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std::string updateByteSliceFunction(size_t _numBytes, size_t _shiftBytes);
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/// signature: (value, shiftBytes, toInsert) -> result
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std::string updateByteSliceFunctionDynamic(size_t _numBytes);
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/// @returns the name of a function that rounds its input to the next multiple
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/// of 32 or the input if it is a multiple of 32.
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/// signature: (value) -> result
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std::string roundUpFunction();
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/// signature: (x, y) -> sum
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std::string overflowCheckedIntAddFunction(IntegerType const& _type);
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/// signature: (x, y) -> product
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std::string overflowCheckedIntMulFunction(IntegerType const& _type);
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/// @returns name of function to perform division on integers.
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/// Checks for division by zero and the special case of
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/// signed division of the smallest number by -1.
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std::string overflowCheckedIntDivFunction(IntegerType const& _type);
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/// @returns name of function to perform modulo on integers.
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/// Reverts for modulo by zero.
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std::string checkedIntModFunction(IntegerType const& _type);
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/// @returns computes the difference between two values.
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/// Assumes the input to be in range for the type.
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/// signature: (x, y) -> diff
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std::string overflowCheckedIntSubFunction(IntegerType const& _type);
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/// @returns the name of a function that fetches the length of the given
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/// array
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/// signature: (array) -> length
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std::string arrayLengthFunction(ArrayType const& _type);
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/// @returns the name of a function that resizes a storage array
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/// signature: (array, newLen)
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std::string resizeDynamicArrayFunction(ArrayType const& _type);
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/// @returns the name of a function that will clear the storage area given
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/// by the start and end (exclusive) parameters (slots).
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/// signature: (start, end)
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std::string clearStorageRangeFunction(Type const& _type);
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/// @returns the name of a function that will clear the given storage array
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/// signature: (slot) ->
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std::string clearStorageArrayFunction(ArrayType const& _type);
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/// Returns the name of a function that will convert a given length to the
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/// size in memory (number of storage slots or calldata/memory bytes) it
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/// will require.
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/// signature: (length) -> size
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std::string arrayConvertLengthToSize(ArrayType const& _type);
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/// @returns the name of a function that computes the number of bytes required
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/// to store an array in memory given its length (internally encoded, not ABI encoded).
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/// The function reverts for too large lengths.
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std::string arrayAllocationSizeFunction(ArrayType const& _type);
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/// @returns the name of a function that converts a storage slot number
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/// a memory pointer or a calldata pointer to the slot number / memory pointer / calldata pointer
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/// for the data position of an array which is stored in that slot / memory area / calldata area.
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std::string arrayDataAreaFunction(ArrayType const& _type);
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/// @returns the name of a function that returns the slot and offset for the
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/// given array and index
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/// signature: (array, index) -> slot, offset
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std::string storageArrayIndexAccessFunction(ArrayType const& _type);
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/// @returns the name of a function that returns the memory address for the
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/// given array base ref and index.
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/// Causes invalid opcode on out of range access.
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/// signature: (baseRef, index) -> address
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std::string memoryArrayIndexAccessFunction(ArrayType const& _type);
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/// @returns the name of a function that returns the calldata address for the
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/// given array base ref and index.
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/// signature: (baseRef, index) -> address
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std::string calldataArrayIndexAccessFunction(ArrayType const& _type);
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/// @returns the name of a function that advances an array data pointer to the next element.
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/// Only works for memory arrays, calldata arrays and storage arrays that every item occupies one or multiple full slots.
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std::string nextArrayElementFunction(ArrayType const& _type);
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/// @returns the name of a function that performs index access for mappings.
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/// @param _mappingType the type of the mapping
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/// @param _keyType the type of the value provided
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std::string mappingIndexAccessFunction(MappingType const& _mappingType, Type const& _keyType);
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/// @returns a function that reads a value type from storage.
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/// Performs bit mask/sign extend cleanup and appropriate left / right shift, but not validation.
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/// @param _splitFunctionTypes if false, returns the address and function signature in a
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/// single variable.
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std::string readFromStorage(Type const& _type, size_t _offset, bool _splitFunctionTypes);
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std::string readFromStorageDynamic(Type const& _type, bool _splitFunctionTypes);
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/// @returns a function that reads a value type from memory.
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/// signature: (addr) -> value
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std::string readFromMemory(Type const& _type);
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/// @returns a function that reads a value type from calldata.
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/// Reverts on invalid input.
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/// signature: (addr) -> value
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std::string readFromCalldata(Type const& _type);
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/// @returns a function that extracts a value type from storage slot that has been
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/// retrieved already.
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/// Performs bit mask/sign extend cleanup and appropriate left / right shift, but not validation.
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/// @param _splitFunctionTypes if false, returns the address and function signature in a
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/// single variable.
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std::string extractFromStorageValue(Type const& _type, size_t _offset, bool _splitFunctionTypes);
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std::string extractFromStorageValueDynamic(Type const& _type, bool _splitFunctionTypes);
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/// Returns the name of a function will write the given value to
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/// the specified slot and offset. If offset is not given, it is expected as
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/// runtime parameter.
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/// signature: (slot, [offset,] value)
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std::string updateStorageValueFunction(Type const& _type, boost::optional<unsigned> const& _offset = boost::optional<unsigned>());
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/// Returns the name of a function that will write the given value to
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/// the specified address.
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/// Performs a cleanup before writing for value types.
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/// signature: (memPtr, value) ->
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std::string writeToMemoryFunction(Type const& _type);
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/// Performs cleanup after reading from a potentially compressed storage slot.
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/// The function does not perform any validation, it just masks or sign-extends
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/// higher order bytes or left-aligns (in case of bytesNN).
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/// The storage cleanup expects the value to be right-aligned with potentially
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/// dirty higher order bytes.
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/// @param _splitFunctionTypes if false, returns the address and function signature in a
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/// single variable.
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std::string cleanupFromStorageFunction(Type const& _type, bool _splitFunctionTypes);
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/// @returns the name of a function that prepares a value of the given type
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/// for being stored in storage. This usually includes cleanup and right-alignment
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/// to fit the number of bytes in storage.
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/// The resulting value might still have dirty higher order bits.
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std::string prepareStoreFunction(Type const& _type);
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/// @returns the name of a function that allocates memory.
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/// Modifies the "free memory pointer"
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/// Arguments: size
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/// Return value: pointer
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std::string allocationFunction();
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/// @returns the name of a function that allocates a memory array.
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/// For dynamic arrays it adds space for length and stores it.
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/// signature: (length) -> memPtr
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std::string allocateMemoryArrayFunction(ArrayType const& _type);
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/// @returns the name of the function that converts a value of type @a _from
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/// to a value of type @a _to. The resulting vale is guaranteed to be in range
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/// (i.e. "clean"). Asserts on failure.
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///
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/// This is used for data being encoded or general type conversions in the code.
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std::string conversionFunction(Type const& _from, Type const& _to);
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/// @returns the name of the cleanup function for the given type and
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/// adds its implementation to the requested functions.
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/// The cleanup function defers to the validator function with "assert"
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/// if there is no reasonable way to clean a value.
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std::string cleanupFunction(Type const& _type);
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/// @returns the name of the validator function for the given type and
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/// adds its implementation to the requested functions.
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/// @param _revertOnFailure if true, causes revert on invalid data,
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/// otherwise an assertion failure.
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///
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/// This is used for data decoded from external sources.
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std::string validatorFunction(Type const& _type, bool _revertOnFailure = false);
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std::string packedHashFunction(std::vector<Type const*> const& _givenTypes, std::vector<Type const*> const& _targetTypes);
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/// @returns the name of a function that reverts and uses returndata (if available)
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/// as reason string.
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std::string forwardingRevertFunction();
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std::string incrementCheckedFunction(Type const& _type);
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std::string decrementCheckedFunction(Type const& _type);
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std::string negateNumberCheckedFunction(Type const& _type);
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/// @returns the name of a function that returns the zero value for the
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/// provided type
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std::string zeroValueFunction(Type const& _type);
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/// @returns the name of a function that will set the given storage item to
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/// zero
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/// signature: (slot, offset) ->
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std::string storageSetToZeroFunction(Type const& _type);
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private:
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/// Special case of conversionFunction - handles everything that does not
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/// use exactly one variable to hold the value.
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std::string conversionFunctionSpecial(Type const& _from, Type const& _to);
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std::string readFromMemoryOrCalldata(Type const& _type, bool _fromCalldata);
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langutil::EVMVersion m_evmVersion;
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std::shared_ptr<MultiUseYulFunctionCollector> m_functionCollector;
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};
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}
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}
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