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-/*
- This file is part of cpp-ethereum.
-
- cpp-ethereum is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- cpp-ethereum is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
-*/
-/**
- * @author Christian <c@ethdev.com>
- * @date 2015
- * Code generation utils that handle arrays.
- */
-
-#pragma once
-
-namespace dev
-{
-namespace solidity
-{
-
-class CompilerContext;
-class Type;
-class ArrayType;
-
-/**
- * Class that provides code generation for handling arrays.
- */
-class ArrayUtils
-{
-public:
- ArrayUtils(CompilerContext& _context): m_context(_context) {}
-
- /// Copies an array to an array in storage. The arrays can be of different types only if
- /// their storage representation is the same.
- /// Stack pre: source_reference [source_length] target_reference
- /// Stack post: target_reference
- void copyArrayToStorage(ArrayType const& _targetType, ArrayType const& _sourceType) const;
- /// Copies the data part of an array (which cannot be dynamically nested) from anywhere
- /// to a given position in memory.
- /// This always copies contained data as is (i.e. structs and fixed-size arrays are copied in
- /// place as required by the ABI encoding). Use CompilerUtils::convertType if you want real
- /// memory copies of nested arrays.
- /// Stack pre: memory_offset source_item
- /// Stack post: memory_offest + length(padded)
- void copyArrayToMemory(ArrayType const& _sourceType, bool _padToWordBoundaries = true) const;
- /// Clears the given dynamic or static array.
- /// Stack pre: storage_ref storage_byte_offset
- /// Stack post:
- void clearArray(ArrayType const& _type) const;
- /// Clears the length and data elements of the array referenced on the stack.
- /// Stack pre: reference (excludes byte offset)
- /// Stack post:
- void clearDynamicArray(ArrayType const& _type) const;
- /// Changes the size of a dynamic array and clears the tail if it is shortened.
- /// Stack pre: reference (excludes byte offset) new_length
- /// Stack post:
- void resizeDynamicArray(ArrayType const& _type) const;
- /// Appends a loop that clears a sequence of storage slots of the given type (excluding end).
- /// Stack pre: end_ref start_ref
- /// Stack post: end_ref
- void clearStorageLoop(Type const& _type) const;
- /// Converts length to size (number of storage slots or calldata/memory bytes).
- /// if @a _pad then add padding to multiples of 32 bytes for calldata/memory.
- /// Stack pre: length
- /// Stack post: size
- void convertLengthToSize(ArrayType const& _arrayType, bool _pad = false) const;
- /// Retrieves the length (number of elements) of the array ref on the stack. This also
- /// works for statically-sized arrays.
- /// Stack pre: reference (excludes byte offset for dynamic storage arrays)
- /// Stack post: reference length
- void retrieveLength(ArrayType const& _arrayType) const;
- /// Performs bounds checking and returns a reference on the stack.
- /// Stack pre: reference [length] index
- /// Stack post (storage): storage_slot byte_offset
- /// Stack post: memory/calldata_offset
- void accessIndex(ArrayType const& _arrayType, bool _doBoundsCheck = true) const;
-
-private:
- /// Adds the given number of bytes to a storage byte offset counter and also increments
- /// the storage offset if adding this number again would increase the counter over 32.
- /// @param byteOffsetPosition the stack offset of the storage byte offset
- /// @param storageOffsetPosition the stack offset of the storage slot offset
- void incrementByteOffset(unsigned _byteSize, unsigned _byteOffsetPosition, unsigned _storageOffsetPosition) const;
-
- CompilerContext& m_context;
-};
-
-}
-}