Paweł Bylica
10 years ago
48 changed files with 1637 additions and 458 deletions
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/*
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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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|
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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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|
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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 2015 |
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* Code generation utils that handle arrays. |
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*/ |
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#include <libsolidity/ArrayUtils.h> |
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#include <libevmcore/Instruction.h> |
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#include <libsolidity/CompilerContext.h> |
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#include <libsolidity/CompilerUtils.h> |
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#include <libsolidity/Types.h> |
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#include <libsolidity/Utils.h> |
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#include <libsolidity/LValue.h> |
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using namespace std; |
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using namespace dev; |
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using namespace solidity; |
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void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType const& _sourceType) const |
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{ |
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// stack layout: [source_ref] target_ref (top)
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// need to leave target_ref on the stack at the end
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solAssert(_targetType.getLocation() == ArrayType::Location::Storage, ""); |
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IntegerType uint256(256); |
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Type const* targetBaseType = _targetType.isByteArray() ? &uint256 : &(*_targetType.getBaseType()); |
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Type const* sourceBaseType = _sourceType.isByteArray() ? &uint256 : &(*_sourceType.getBaseType()); |
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switch (_sourceType.getLocation()) |
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{ |
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case ArrayType::Location::CallData: |
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{ |
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solAssert(_targetType.isByteArray(), "Non byte arrays not yet implemented here."); |
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solAssert(_sourceType.isByteArray(), "Non byte arrays not yet implemented here."); |
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// This also assumes that after "length" we only have zeros, i.e. it cannot be used to
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// slice a byte array from calldata.
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// stack: source_offset source_len target_ref
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// fetch old length and convert to words
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m_context << eth::Instruction::DUP1 << eth::Instruction::SLOAD; |
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convertLengthToSize(_targetType); |
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// stack here: source_offset source_len target_ref target_length_words
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// actual array data is stored at SHA3(storage_offset)
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m_context << eth::Instruction::DUP2; |
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CompilerUtils(m_context).computeHashStatic(); |
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// compute target_data_end
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m_context << eth::Instruction::DUP1 << eth::Instruction::SWAP2 << eth::Instruction::ADD |
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<< eth::Instruction::SWAP1; |
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// stack here: source_offset source_len target_ref target_data_end target_data_ref
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// store length (in bytes)
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m_context << eth::Instruction::DUP4 << eth::Instruction::DUP1 << eth::Instruction::DUP5 |
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<< eth::Instruction::SSTORE; |
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// jump to end if length is zero
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m_context << eth::Instruction::ISZERO; |
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eth::AssemblyItem copyLoopEnd = m_context.newTag(); |
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m_context.appendConditionalJumpTo(copyLoopEnd); |
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// store start offset
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m_context << eth::Instruction::DUP5; |
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// stack now: source_offset source_len target_ref target_data_end target_data_ref calldata_offset
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eth::AssemblyItem copyLoopStart = m_context.newTag(); |
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m_context << copyLoopStart |
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// copy from calldata and store
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<< eth::Instruction::DUP1 << eth::Instruction::CALLDATALOAD |
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<< eth::Instruction::DUP3 << eth::Instruction::SSTORE |
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// increment target_data_ref by 1
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<< eth::Instruction::SWAP1 << u256(1) << eth::Instruction::ADD |
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// increment calldata_offset by 32
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<< eth::Instruction::SWAP1 << u256(32) << eth::Instruction::ADD |
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// check for loop condition
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<< eth::Instruction::DUP1 << eth::Instruction::DUP6 << eth::Instruction::GT; |
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m_context.appendConditionalJumpTo(copyLoopStart); |
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m_context << eth::Instruction::POP; |
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m_context << copyLoopEnd; |
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// now clear leftover bytes of the old value
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// stack now: source_offset source_len target_ref target_data_end target_data_ref
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clearStorageLoop(IntegerType(256)); |
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// stack now: source_offset source_len target_ref target_data_end
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m_context << eth::Instruction::POP << eth::Instruction::SWAP2 |
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<< eth::Instruction::POP << eth::Instruction::POP; |
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break; |
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} |
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case ArrayType::Location::Storage: |
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{ |
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// this copies source to target and also clears target if it was larger
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solAssert(sourceBaseType->getStorageSize() == targetBaseType->getStorageSize(), |
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"Copying with different storage sizes not yet implemented."); |
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// stack: source_ref target_ref
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// store target_ref
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m_context << eth::Instruction::SWAP1 << eth::Instruction::DUP2; |
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// stack: target_ref source_ref target_ref
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// fetch lengthes
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retrieveLength(_targetType); |
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m_context << eth::Instruction::SWAP2; |
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// stack: target_ref target_len target_ref source_ref
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retrieveLength(_sourceType); |
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// stack: target_ref target_len target_ref source_ref source_len
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if (_targetType.isDynamicallySized()) |
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// store new target length
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m_context << eth::Instruction::DUP1 << eth::Instruction::DUP4 << eth::Instruction::SSTORE; |
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// compute hashes (data positions)
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m_context << eth::Instruction::SWAP2; |
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if (_targetType.isDynamicallySized()) |
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CompilerUtils(m_context).computeHashStatic(); |
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m_context << eth::Instruction::SWAP1; |
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if (_sourceType.isDynamicallySized()) |
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CompilerUtils(m_context).computeHashStatic(); |
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// stack: target_ref target_len source_len target_data_pos source_data_pos
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m_context << eth::Instruction::DUP4; |
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convertLengthToSize(_sourceType); |
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m_context << eth::Instruction::DUP4; |
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convertLengthToSize(_sourceType); |
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// stack: target_ref target_len source_len target_data_pos source_data_pos target_size source_size
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// @todo we might be able to go without a third counter
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m_context << u256(0); |
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// stack: target_ref target_len source_len target_data_pos source_data_pos target_size source_size counter
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eth::AssemblyItem copyLoopStart = m_context.newTag(); |
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m_context << copyLoopStart; |
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// check for loop condition
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m_context << eth::Instruction::DUP1 << eth::Instruction::DUP3 |
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<< eth::Instruction::GT << eth::Instruction::ISZERO; |
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eth::AssemblyItem copyLoopEnd = m_context.newTag(); |
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m_context.appendConditionalJumpTo(copyLoopEnd); |
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// copy
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m_context << eth::Instruction::DUP4 << eth::Instruction::DUP2 << eth::Instruction::ADD; |
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StorageItem(m_context, *sourceBaseType).retrieveValue(SourceLocation(), true); |
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m_context << eth::dupInstruction(5 + sourceBaseType->getSizeOnStack()) |
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<< eth::dupInstruction(2 + sourceBaseType->getSizeOnStack()) << eth::Instruction::ADD; |
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StorageItem(m_context, *targetBaseType).storeValue(*sourceBaseType, SourceLocation(), true); |
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// increment
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m_context << targetBaseType->getStorageSize() << eth::Instruction::ADD; |
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m_context.appendJumpTo(copyLoopStart); |
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m_context << copyLoopEnd; |
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// zero-out leftovers in target
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// stack: target_ref target_len source_len target_data_pos source_data_pos target_size source_size counter
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// add counter to target_data_pos
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m_context << eth::Instruction::DUP5 << eth::Instruction::ADD |
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<< eth::Instruction::SWAP5 << eth::Instruction::POP; |
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// stack: target_ref target_len target_data_pos_updated target_data_pos source_data_pos target_size source_size
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// add size to target_data_pos to get target_data_end
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m_context << eth::Instruction::POP << eth::Instruction::DUP3 << eth::Instruction::ADD |
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<< eth::Instruction::SWAP4 |
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<< eth::Instruction::POP << eth::Instruction::POP << eth::Instruction::POP; |
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// stack: target_ref target_data_end target_data_pos_updated
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clearStorageLoop(*targetBaseType); |
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m_context << eth::Instruction::POP; |
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break; |
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} |
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default: |
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solAssert(false, "Given byte array location not implemented."); |
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} |
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} |
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void ArrayUtils::clearArray(ArrayType const& _type) const |
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{ |
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solAssert(_type.getLocation() == ArrayType::Location::Storage, ""); |
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if (_type.isDynamicallySized()) |
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clearDynamicArray(_type); |
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else if (_type.getLength() == 0) |
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m_context << eth::Instruction::POP; |
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else if (_type.getLength() < 5) // unroll loop for small arrays @todo choose a good value
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{ |
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for (unsigned i = 1; i < _type.getLength(); ++i) |
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{ |
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StorageItem(m_context, *_type.getBaseType()).setToZero(SourceLocation(), false); |
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m_context << u256(_type.getBaseType()->getStorageSize()) << eth::Instruction::ADD; |
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} |
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StorageItem(m_context, *_type.getBaseType()).setToZero(SourceLocation(), true); |
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} |
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else |
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{ |
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m_context |
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<< eth::Instruction::DUP1 << u256(_type.getLength()) |
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<< u256(_type.getBaseType()->getStorageSize()) |
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<< eth::Instruction::MUL << eth::Instruction::ADD << eth::Instruction::SWAP1; |
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clearStorageLoop(*_type.getBaseType()); |
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m_context << eth::Instruction::POP; |
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} |
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} |
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void ArrayUtils::clearDynamicArray(ArrayType const& _type) const |
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{ |
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solAssert(_type.getLocation() == ArrayType::Location::Storage, ""); |
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solAssert(_type.isDynamicallySized(), ""); |
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// fetch length
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m_context << eth::Instruction::DUP1 << eth::Instruction::SLOAD; |
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// set length to zero
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m_context << u256(0) << eth::Instruction::DUP3 << eth::Instruction::SSTORE; |
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// stack: ref old_length
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convertLengthToSize(_type); |
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// compute data positions
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m_context << eth::Instruction::SWAP1; |
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CompilerUtils(m_context).computeHashStatic(); |
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// stack: len data_pos (len is in slots for byte array and in items for other arrays)
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m_context << eth::Instruction::SWAP1 << eth::Instruction::DUP2 << eth::Instruction::ADD |
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<< eth::Instruction::SWAP1; |
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// stack: data_pos_end data_pos
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if (_type.isByteArray()) |
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clearStorageLoop(IntegerType(256)); |
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else |
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clearStorageLoop(*_type.getBaseType()); |
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// cleanup
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m_context << eth::Instruction::POP; |
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} |
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void ArrayUtils::resizeDynamicArray(const ArrayType& _type) const |
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{ |
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solAssert(_type.getLocation() == ArrayType::Location::Storage, ""); |
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solAssert(_type.isDynamicallySized(), ""); |
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eth::AssemblyItem resizeEnd = m_context.newTag(); |
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// stack: ref new_length
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// fetch old length
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m_context << eth::Instruction::DUP2 << eth::Instruction::SLOAD; |
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// stack: ref new_length old_length
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// store new length
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m_context << eth::Instruction::DUP2 << eth::Instruction::DUP4 << eth::Instruction::SSTORE; |
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// skip if size is not reduced
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m_context << eth::Instruction::DUP2 << eth::Instruction::DUP2 |
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<< eth::Instruction::ISZERO << eth::Instruction::GT; |
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m_context.appendConditionalJumpTo(resizeEnd); |
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// size reduced, clear the end of the array
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// stack: ref new_length old_length
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convertLengthToSize(_type); |
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m_context << eth::Instruction::DUP2; |
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convertLengthToSize(_type); |
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// stack: ref new_length old_size new_size
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// compute data positions
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m_context << eth::Instruction::DUP4; |
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CompilerUtils(m_context).computeHashStatic(); |
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// stack: ref new_length old_size new_size data_pos
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m_context << eth::Instruction::SWAP2 << eth::Instruction::DUP3 << eth::Instruction::ADD; |
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// stack: ref new_length data_pos new_size delete_end
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m_context << eth::Instruction::SWAP2 << eth::Instruction::ADD; |
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// stack: ref new_length delete_end delete_start
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if (_type.isByteArray()) |
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clearStorageLoop(IntegerType(256)); |
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else |
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clearStorageLoop(*_type.getBaseType()); |
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m_context << resizeEnd; |
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// cleanup
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m_context << eth::Instruction::POP << eth::Instruction::POP << eth::Instruction::POP; |
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} |
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void ArrayUtils::clearStorageLoop(Type const& _type) const |
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{ |
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// stack: end_pos pos
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eth::AssemblyItem loopStart = m_context.newTag(); |
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m_context << loopStart; |
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// check for loop condition
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m_context << eth::Instruction::DUP1 << eth::Instruction::DUP3 |
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<< eth::Instruction::GT << eth::Instruction::ISZERO; |
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eth::AssemblyItem zeroLoopEnd = m_context.newTag(); |
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m_context.appendConditionalJumpTo(zeroLoopEnd); |
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// delete
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StorageItem(m_context, _type).setToZero(SourceLocation(), false); |
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// increment
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m_context << u256(1) << eth::Instruction::ADD; |
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m_context.appendJumpTo(loopStart); |
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// cleanup
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m_context << zeroLoopEnd; |
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m_context << eth::Instruction::POP; |
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} |
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void ArrayUtils::convertLengthToSize(ArrayType const& _arrayType) const |
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{ |
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if (_arrayType.isByteArray()) |
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m_context << u256(31) << eth::Instruction::ADD |
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<< u256(32) << eth::Instruction::SWAP1 << eth::Instruction::DIV; |
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else if (_arrayType.getBaseType()->getStorageSize() > 1) |
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m_context << _arrayType.getBaseType()->getStorageSize() << eth::Instruction::MUL; |
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} |
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void ArrayUtils::retrieveLength(ArrayType const& _arrayType) const |
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{ |
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if (_arrayType.isDynamicallySized()) |
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m_context << eth::Instruction::DUP1 << eth::Instruction::SLOAD; |
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else |
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m_context << _arrayType.getLength(); |
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} |
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@ -0,0 +1,78 @@ |
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/*
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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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|
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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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|
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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 2015 |
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* Code generation utils that handle arrays. |
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*/ |
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#pragma once |
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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 CompilerContext; |
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class Type; |
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class ArrayType; |
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/**
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* Class that provides code generation for handling arrays. |
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*/ |
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class ArrayUtils |
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{ |
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public: |
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ArrayUtils(CompilerContext& _context): m_context(_context) {} |
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/// Copies an array to an array in storage. The arrays can be of different types only if
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/// their storage representation is the same.
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/// Stack pre: [source_reference] target_reference
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/// Stack post: target_reference
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void copyArrayToStorage(ArrayType const& _targetType, ArrayType const& _sourceType) const; |
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/// Clears the given dynamic or static array.
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/// Stack pre: reference
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/// Stack post:
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void clearArray(ArrayType const& _type) const; |
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/// Clears the length and data elements of the array referenced on the stack.
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/// Stack pre: reference
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/// Stack post:
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void clearDynamicArray(ArrayType const& _type) const; |
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/// Changes the size of a dynamic array and clears the tail if it is shortened.
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/// Stack pre: reference new_length
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/// Stack post:
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void resizeDynamicArray(ArrayType const& _type) const; |
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/// Appends a loop that clears a sequence of storage slots of the given type (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(Type const& _type) const; |
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/// Converts length to size (multiplies by size on stack), rounds up for byte arrays.
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/// Stack pre: length
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/// Stack post: size
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void convertLengthToSize(ArrayType const& _arrayType) const; |
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/// Retrieves the length (number of elements) of the array ref on the stack. This also
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/// works for statically-sized arrays.
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/// Stack pre: reference
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/// Stack post: reference length
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void retrieveLength(ArrayType const& _arrayType) const; |
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private: |
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CompilerContext& m_context; |
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}; |
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} |
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} |
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