mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
120 lines
4.9 KiB
C++
120 lines
4.9 KiB
C++
/*
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This file is part of cpp-ethereum.
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cpp-ethereum 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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cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2014
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* Routines used by both the compiler and the expression compiler.
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*/
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#pragma once
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#include <libsolidity/CompilerContext.h>
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#include <libsolidity/ASTForward.h>
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namespace dev {
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namespace solidity {
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class Type; // forward
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class CompilerUtils
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{
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public:
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CompilerUtils(CompilerContext& _context): m_context(_context) {}
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/// Loads data from memory to the stack.
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/// @param _offset offset in memory (or calldata)
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/// @param _type data type to load
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/// @param _fromCalldata if true, load from calldata, not from memory
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/// @param _padToWordBoundaries if true, assume the data is padded to word (32 byte) boundaries
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/// @returns the number of bytes consumed in memory.
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unsigned loadFromMemory(unsigned _offset, Type const& _type = IntegerType(256),
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bool _fromCalldata = false, bool _padToWordBoundaries = false);
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/// Dynamic version of @see loadFromMemory, expects the memory offset on the stack.
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/// Stack pre: memory_offset
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/// Stack post: value... (memory_offset+length)
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void loadFromMemoryDynamic(Type const& _type, bool _fromCalldata = false, bool _padToWordBoundaries = true);
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/// Stores data from stack in memory.
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/// @param _offset offset in memory
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/// @param _type type of the data on the stack
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/// @param _padToWordBoundaries if true, pad the data to word (32 byte) boundaries
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/// @returns the number of bytes written to memory (can be different from _bytes if
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/// _padToWordBoundaries is true)
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unsigned storeInMemory(unsigned _offset, Type const& _type = IntegerType(256), bool _padToWordBoundaries = false);
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/// Dynamic version of @see storeInMemory, expects the memory offset below the value on the stack
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/// and also updates that.
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/// Stack pre: memory_offset value...
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/// Stack post: (memory_offset+length)
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void storeInMemoryDynamic(Type const& _type, bool _padToWordBoundaries = true);
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/// @returns _size rounded up to the next multiple of 32 (the number of bytes occupied in the
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/// padded calldata)
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static unsigned getPaddedSize(unsigned _size) { return ((_size + 31) / 32) * 32; }
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/// Moves the value that is at the top of the stack to a stack variable.
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void moveToStackVariable(VariableDeclaration const& _variable);
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/// Copies a variable of type @a _type from a stack depth of @a _stackDepth to the top of the stack.
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void copyToStackTop(unsigned _stackDepth, Type const& _type);
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/// Removes the current value from the top of the stack.
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void popStackElement(Type const& _type);
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template <class T>
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static unsigned getSizeOnStack(std::vector<T> const& _variables);
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static unsigned getSizeOnStack(std::vector<std::shared_ptr<Type const>> const& _variableTypes);
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/// Appends code that computes tha SHA3 hash of the topmost stack element of type @a _type.
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/// If @a _pad is set, padds the type to muliples of 32 bytes.
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/// @note Only works for types of fixed size.
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void computeHashStatic(Type const& _type = IntegerType(256), bool _padToWordBoundaries = false);
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/// Copies a byte array to a byte array in storage.
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/// Stack pre: [source_reference] target_reference
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/// Stack post: target_reference
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void copyByteArrayToStorage(ByteArrayType const& _targetType, ByteArrayType const& _sourceType) const;
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/// Clears the length and data elements of the byte array referenced on the stack.
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/// Stack pre: reference
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/// Stack post:
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void clearByteArray(ByteArrayType const& _type) const;
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/// Bytes we need to the start of call data.
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/// - The size in bytes of the function (hash) identifier.
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static const unsigned int dataStartOffset;
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private:
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/// Prepares the given type for storing in memory by shifting it if necessary.
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unsigned prepareMemoryStore(Type const& _type, bool _padToWordBoundaries) const;
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/// Loads type from memory assuming memory offset is on stack top.
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unsigned loadFromMemoryHelper(Type const& _type, bool _fromCalldata, bool _padToWordBoundaries);
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/// Appends a loop that clears a sequence of storage slots (excluding end).
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/// Stack pre: end_ref start_ref
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/// Stack post: end_ref
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void clearStorageLoop() const;
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CompilerContext& m_context;
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};
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template <class T>
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unsigned CompilerUtils::getSizeOnStack(std::vector<T> const& _variables)
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{
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unsigned size = 0;
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for (T const& variable: _variables)
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size += variable->getType()->getSizeOnStack();
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return size;
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}
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}
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}
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