reduce unnecessary solidity:: namespace

14 files changed, 658 insertions, 658 deletions

diff --git a/libevmasm/BlockDeduplicator.cpp b/libevmasm/BlockDeduplicator.cpp
index d88474a7..3bb7a797 100644
--- a/libevmasm/BlockDeduplicator.cpp
+++ b/libevmasm/BlockDeduplicator.cpp
@@ -106,7 +106,7 @@ BlockDeduplicator::BlockIterator& BlockDeduplicator::BlockIterator::operator++()
 {
 	if (it == end)
 		return *this;
-	if (SemanticInformation::altersControlFlow(*it) && *it != AssemblyItem(solidity::Instruction::JUMPI))
+	if (SemanticInformation::altersControlFlow(*it) && *it != AssemblyItem(Instruction::JUMPI))
 		it = end;
 	else
 	{
diff --git a/libevmasm/GasMeter.cpp b/libevmasm/GasMeter.cpp
index eab3037b..40a67bb1 100644
--- a/libevmasm/GasMeter.cpp
+++ b/libevmasm/GasMeter.cpp
@@ -84,13 +84,13 @@ GasMeter::GasConsumption GasMeter::estimateMax(AssemblyItem const& _item)
 			break;
 		case Instruction::MLOAD:
 		case Instruction::MSTORE:
-			gas += memoryGas(classes.find(solidity::Instruction::ADD, {
+			gas += memoryGas(classes.find(Instruction::ADD, {
 				m_state->relativeStackElement(0),
 				classes.find(AssemblyItem(32))
 			}));
 			break;
 		case Instruction::MSTORE8:
-			gas += memoryGas(classes.find(solidity::Instruction::ADD, {
+			gas += memoryGas(classes.find(Instruction::ADD, {
 				m_state->relativeStackElement(0),
 				classes.find(AssemblyItem(1))
 			}));
@@ -198,7 +198,7 @@ GasMeter::GasConsumption GasMeter::memoryGas(int _stackPosOffset, int _stackPosS
 	if (classes.knownZero(m_state->relativeStackElement(_stackPosSize)))
 		return GasConsumption(0);
 	else
-		return memoryGas(classes.find(solidity::Instruction::ADD, {
+		return memoryGas(classes.find(Instruction::ADD, {
 			m_state->relativeStackElement(_stackPosOffset),
 			m_state->relativeStackElement(_stackPosSize)
 		}));
diff --git a/libevmasm/PathGasMeter.cpp b/libevmasm/PathGasMeter.cpp
index 5988c280..2113008b 100644
--- a/libevmasm/PathGasMeter.cpp
+++ b/libevmasm/PathGasMeter.cpp
@@ -76,7 +76,7 @@ GasMeter::GasConsumption PathGasMeter::handleQueueItem()
 		bool branchStops = false;
 		jumpTags.clear();
 		AssemblyItem const& item = m_items.at(index);
-		if (item.type() == Tag || item == AssemblyItem(solidity::Instruction::JUMPDEST))
+		if (item.type() == Tag || item == AssemblyItem(Instruction::JUMPDEST))
 		{
 			// Do not allow any backwards jump. This is quite restrictive but should work for
 			// the simplest things.
@@ -84,14 +84,14 @@ GasMeter::GasConsumption PathGasMeter::handleQueueItem()
 				return GasMeter::GasConsumption::infinite();
 			path->visitedJumpdests.insert(index);
 		}
-		else if (item == AssemblyItem(solidity::Instruction::JUMP))
+		else if (item == AssemblyItem(Instruction::JUMP))
 		{
 			branchStops = true;
 			jumpTags = state->tagsInExpression(state->relativeStackElement(0));
 			if (jumpTags.empty()) // unknown jump destination
 				return GasMeter::GasConsumption::infinite();
 		}
-		else if (item == AssemblyItem(solidity::Instruction::JUMPI))
+		else if (item == AssemblyItem(Instruction::JUMPI))
 		{
 			ExpressionClasses::Id condition = state->relativeStackElement(-1);
 			if (classes.knownNonZero(condition) || !classes.knownZero(condition))
diff --git a/libevmasm/SemanticInformation.cpp b/libevmasm/SemanticInformation.cpp
index 13d77876..ea579b83 100644
--- a/libevmasm/SemanticInformation.cpp
+++ b/libevmasm/SemanticInformation.cpp
@@ -147,7 +147,7 @@ bool SemanticInformation::isDeterministic(AssemblyItem const& _item)
 	}
 }
 
-bool SemanticInformation::invalidatesMemory(solidity::Instruction _instruction)
+bool SemanticInformation::invalidatesMemory(Instruction _instruction)
 {
 	switch (_instruction)
 	{
diff --git a/libsolidity/analysis/TypeChecker.cpp b/libsolidity/analysis/TypeChecker.cpp
index 30e1a2ba..bc342b58 100644
--- a/libsolidity/analysis/TypeChecker.cpp
+++ b/libsolidity/analysis/TypeChecker.cpp
@@ -595,7 +595,7 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
 				if (!varDecl->isLocalVariable())
 					return false; // only local variables are inline-assemlby lvalues
 				for (unsigned i = 0; i < declaration->type()->sizeOnStack(); ++i)
-					_assembly.append(solidity::Instruction::POP); // remove value just to verify the stack height
+					_assembly.append(Instruction::POP); // remove value just to verify the stack height
 			}
 			else
 				return false;
diff --git a/libsolidity/codegen/ArrayUtils.cpp b/libsolidity/codegen/ArrayUtils.cpp
index c06d83e2..8e568be5 100644
--- a/libsolidity/codegen/ArrayUtils.cpp
+++ b/libsolidity/codegen/ArrayUtils.cpp
@@ -56,7 +56,7 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 	// stack: source_ref [source_length] target_ref
 	// store target_ref
 	for (unsigned i = _sourceType.sizeOnStack(); i > 0; --i)
-		m_context << solidity::swapInstruction(i);
+		m_context << swapInstruction(i);
 	// stack: target_ref source_ref [source_length]
 	// stack: target_ref source_ref [source_length]
 	// retrieve source length
@@ -65,12 +65,12 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 	if (_sourceType.location() == DataLocation::Memory && _sourceType.isDynamicallySized())
 	{
 		// increment source pointer to point to data
-		m_context << solidity::Instruction::SWAP1 << u256(0x20);
-		m_context << solidity::Instruction::ADD << Instruction::SWAP1;
+		m_context << Instruction::SWAP1 << u256(0x20);
+		m_context << Instruction::ADD << Instruction::SWAP1;
 	}
 
 	// stack: target_ref source_ref source_length
-	m_context << solidity::Instruction::DUP3;
+	m_context << Instruction::DUP3;
 	// stack: target_ref source_ref source_length target_ref
 	retrieveLength(_targetType);
 	// stack: target_ref source_ref source_length target_ref target_length
@@ -78,28 +78,28 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 		// store new target length
 		if (!_targetType.isByteArray())
 			// Otherwise, length will be stored below.
-			m_context << solidity::Instruction::DUP3 << solidity::Instruction::DUP3 << solidity::Instruction::SSTORE;
+			m_context << Instruction::DUP3 << Instruction::DUP3 << Instruction::SSTORE;
 	if (sourceBaseType->category() == Type::Category::Mapping)
 	{
 		solAssert(targetBaseType->category() == Type::Category::Mapping, "");
 		solAssert(_sourceType.location() == DataLocation::Storage, "");
 		// nothing to copy
 		m_context
-			<< solidity::Instruction::POP << solidity::Instruction::POP
-			<< solidity::Instruction::POP << solidity::Instruction::POP;
+			<< Instruction::POP << Instruction::POP
+			<< Instruction::POP << Instruction::POP;
 		return;
 	}
 	// stack: target_ref source_ref source_length target_ref target_length
 	// compute hashes (data positions)
-	m_context << solidity::Instruction::SWAP1;
+	m_context << Instruction::SWAP1;
 	if (_targetType.isDynamicallySized())
 		CompilerUtils(m_context).computeHashStatic();
 	// stack: target_ref source_ref source_length target_length target_data_pos
-	m_context << solidity::Instruction::SWAP1;
+	m_context << Instruction::SWAP1;
 	convertLengthToSize(_targetType);
-	m_context << solidity::Instruction::DUP2 << solidity::Instruction::ADD;
+	m_context << Instruction::DUP2 << Instruction::ADD;
 	// stack: target_ref source_ref source_length target_data_pos target_data_end
-	m_context << solidity::Instruction::SWAP3;
+	m_context << Instruction::SWAP3;
 	// stack: target_ref target_data_end source_length target_data_pos source_ref
 
 	eth::AssemblyItem copyLoopEndWithoutByteOffset = m_context.newTag();
@@ -108,47 +108,47 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 	if (_targetType.isByteArray())
 	{
 		// stack: target_ref target_data_end source_length target_data_pos source_ref
-		m_context << solidity::Instruction::DUP3 << u256(31) << solidity::Instruction::LT;
+		m_context << Instruction::DUP3 << u256(31) << Instruction::LT;
 		eth::AssemblyItem longByteArray = m_context.appendConditionalJump();
 		// store the short byte array
 		solAssert(_sourceType.isByteArray(), "");
 		if (_sourceType.location() == DataLocation::Storage)
 		{
 			// just copy the slot, it contains length and data
-			m_context << solidity::Instruction::DUP1 << solidity::Instruction::SLOAD;
-			m_context << solidity::Instruction::DUP6 << solidity::Instruction::SSTORE;
+			m_context << Instruction::DUP1 << Instruction::SLOAD;
+			m_context << Instruction::DUP6 << Instruction::SSTORE;
 		}
 		else
 		{
-			m_context << solidity::Instruction::DUP1;
+			m_context << Instruction::DUP1;
 			CompilerUtils(m_context).loadFromMemoryDynamic(*sourceBaseType, fromCalldata, true, false);
 			// stack: target_ref target_data_end source_length target_data_pos source_ref value
 			// clear the lower-order byte - which will hold the length
-			m_context << u256(0xff) << solidity::Instruction::NOT << solidity::Instruction::AND;
+			m_context << u256(0xff) << Instruction::NOT << Instruction::AND;
 			// fetch the length and shift it left by one
-			m_context << solidity::Instruction::DUP4 << solidity::Instruction::DUP1 << solidity::Instruction::ADD;
+			m_context << Instruction::DUP4 << Instruction::DUP1 << Instruction::ADD;
 			// combine value and length and store them
-			m_context << solidity::Instruction::OR << solidity::Instruction::DUP6 << solidity::Instruction::SSTORE;
+			m_context << Instruction::OR << Instruction::DUP6 << Instruction::SSTORE;
 		}
 		// end of special case, jump right into cleaning target data area
 		m_context.appendJumpTo(copyLoopEndWithoutByteOffset);
 		m_context << longByteArray;
 		// Store length (2*length+1)
-		m_context << solidity::Instruction::DUP3 << solidity::Instruction::DUP1 << solidity::Instruction::ADD;
-		m_context << u256(1) << solidity::Instruction::ADD;
-		m_context << solidity::Instruction::DUP6 << solidity::Instruction::SSTORE;
+		m_context << Instruction::DUP3 << Instruction::DUP1 << Instruction::ADD;
+		m_context << u256(1) << Instruction::ADD;
+		m_context << Instruction::DUP6 << Instruction::SSTORE;
 	}
 
 	// skip copying if source length is zero
-	m_context << solidity::Instruction::DUP3 << solidity::Instruction::ISZERO;
+	m_context << Instruction::DUP3 << Instruction::ISZERO;
 	m_context.appendConditionalJumpTo(copyLoopEndWithoutByteOffset);
 
 	if (_sourceType.location() == DataLocation::Storage && _sourceType.isDynamicallySized())
 		CompilerUtils(m_context).computeHashStatic();
 	// stack: target_ref target_data_end source_length target_data_pos source_data_pos
-	m_context << solidity::Instruction::SWAP2;
+	m_context << Instruction::SWAP2;
 	convertLengthToSize(_sourceType);
-	m_context << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
+	m_context << Instruction::DUP3 << Instruction::ADD;
 	// stack: target_ref target_data_end source_data_pos target_data_pos source_data_end
 	if (haveByteOffsetTarget)
 		m_context << u256(0);
@@ -159,8 +159,8 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 	m_context << copyLoopStart;
 	// check for loop condition
 	m_context
-		<< solidity::dupInstruction(3 + byteOffsetSize) << solidity::dupInstruction(2 + byteOffsetSize)
-		<< solidity::Instruction::GT << solidity::Instruction::ISZERO;
+		<< dupInstruction(3 + byteOffsetSize) << dupInstruction(2 + byteOffsetSize)
+		<< Instruction::GT << Instruction::ISZERO;
 	eth::AssemblyItem copyLoopEnd = m_context.appendConditionalJump();
 	// stack: target_ref target_data_end source_data_pos target_data_pos source_data_end [target_byte_offset] [source_byte_offset]
 	// copy
@@ -168,19 +168,19 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 	{
 		solAssert(byteOffsetSize == 0, "Byte offset for array as base type.");
 		auto const& sourceBaseArrayType = dynamic_cast<ArrayType const&>(*sourceBaseType);
-		m_context << solidity::Instruction::DUP3;
+		m_context << Instruction::DUP3;
 		if (sourceBaseArrayType.location() == DataLocation::Memory)
-			m_context << solidity::Instruction::MLOAD;
-		m_context << solidity::Instruction::DUP3;
+			m_context << Instruction::MLOAD;
+		m_context << Instruction::DUP3;
 		copyArrayToStorage(dynamic_cast<ArrayType const&>(*targetBaseType), sourceBaseArrayType);
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	}
 	else if (directCopy)
 	{
 		solAssert(byteOffsetSize == 0, "Byte offset for direct copy.");
 		m_context
-			<< solidity::Instruction::DUP3 << solidity::Instruction::SLOAD
-			<< solidity::Instruction::DUP3 << solidity::Instruction::SSTORE;
+			<< Instruction::DUP3 << Instruction::SLOAD
+			<< Instruction::DUP3 << Instruction::SSTORE;
 	}
 	else
 	{
@@ -188,11 +188,11 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 		// We might copy too much if there is padding at the last element, but this way end
 		// checking is easier.
 		// stack: target_ref target_data_end source_data_pos target_data_pos source_data_end [target_byte_offset] [source_byte_offset]
-		m_context << solidity::dupInstruction(3 + byteOffsetSize);
+		m_context << dupInstruction(3 + byteOffsetSize);
 		if (_sourceType.location() == DataLocation::Storage)
 		{
 			if (haveByteOffsetSource)
-				m_context << solidity::Instruction::DUP2;
+				m_context << Instruction::DUP2;
 			else
 				m_context << u256(0);
 			StorageItem(m_context, *sourceBaseType).retrieveValue(SourceLocation(), true);
@@ -207,9 +207,9 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 			"Stack too deep, try removing local variables."
 		);
 		// fetch target storage reference
-		m_context << solidity::dupInstruction(2 + byteOffsetSize + sourceBaseType->sizeOnStack());
+		m_context << dupInstruction(2 + byteOffsetSize + sourceBaseType->sizeOnStack());
 		if (haveByteOffsetTarget)
-			m_context << solidity::dupInstruction(1 + byteOffsetSize + sourceBaseType->sizeOnStack());
+			m_context << dupInstruction(1 + byteOffsetSize + sourceBaseType->sizeOnStack());
 		else
 			m_context << u256(0);
 		StorageItem(m_context, *targetBaseType).storeValue(*sourceBaseType, SourceLocation(), true);
@@ -220,7 +220,7 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 		incrementByteOffset(sourceBaseType->storageBytes(), 1, haveByteOffsetTarget ? 5 : 4);
 	else
 	{
-		m_context << solidity::swapInstruction(2 + byteOffsetSize);
+		m_context << swapInstruction(2 + byteOffsetSize);
 		if (sourceIsStorage)
 			m_context << sourceBaseType->storageSize();
 		else if (_sourceType.location() == DataLocation::Memory)
@@ -228,44 +228,44 @@ void ArrayUtils::copyArrayToStorage(ArrayType const& _targetType, ArrayType cons
 		else
 			m_context << sourceBaseType->calldataEncodedSize(true);
 		m_context
-			<< solidity::Instruction::ADD
-			<< solidity::swapInstruction(2 + byteOffsetSize);
+			<< Instruction::ADD
+			<< swapInstruction(2 + byteOffsetSize);
 	}
 	// increment target
 	if (haveByteOffsetTarget)
 		incrementByteOffset(targetBaseType->storageBytes(), byteOffsetSize, byteOffsetSize + 2);
 	else
 		m_context
-			<< solidity::swapInstruction(1 + byteOffsetSize)
+			<< swapInstruction(1 + byteOffsetSize)
 			<< targetBaseType->storageSize()
-			<< solidity::Instruction::ADD
-			<< solidity::swapInstruction(1 + byteOffsetSize);
+			<< Instruction::ADD
+			<< swapInstruction(1 + byteOffsetSize);
 	m_context.appendJumpTo(copyLoopStart);
 	m_context << copyLoopEnd;
 	if (haveByteOffsetTarget)
 	{
 		// clear elements that might be left over in the current slot in target
 		// stack: target_ref target_data_end source_data_pos target_data_pos source_data_end target_byte_offset [source_byte_offset]
-		m_context << solidity::dupInstruction(byteOffsetSize) << solidity::Instruction::ISZERO;
+		m_context << dupInstruction(byteOffsetSize) << Instruction::ISZERO;
 		eth::AssemblyItem copyCleanupLoopEnd = m_context.appendConditionalJump();
-		m_context << solidity::dupInstruction(2 + byteOffsetSize) << solidity::dupInstruction(1 + byteOffsetSize);
+		m_context << dupInstruction(2 + byteOffsetSize) << dupInstruction(1 + byteOffsetSize);
 		StorageItem(m_context, *targetBaseType).setToZero(SourceLocation(), true);
 		incrementByteOffset(targetBaseType->storageBytes(), byteOffsetSize, byteOffsetSize + 2);
 		m_context.appendJumpTo(copyLoopEnd);
 
 		m_context << copyCleanupLoopEnd;
-		m_context << solidity::Instruction::POP; // might pop the source, but then target is popped next
+		m_context << Instruction::POP; // might pop the source, but then target is popped next
 	}
 	if (haveByteOffsetSource)
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	m_context << copyLoopEndWithoutByteOffset;
 
 	// zero-out leftovers in target
 	// stack: target_ref target_data_end source_data_pos target_data_pos_updated source_data_end
-	m_context << solidity::Instruction::POP << solidity::Instruction::SWAP1 << solidity::Instruction::POP;
+	m_context << Instruction::POP << Instruction::SWAP1 << Instruction::POP;
 	// stack: target_ref target_data_end target_data_pos_updated
 	clearStorageLoop(*targetBaseType);
-	m_context << solidity::Instruction::POP;
+	m_context << Instruction::POP;
 }
 
 void ArrayUtils::copyArrayToMemory(ArrayType const& _sourceType, bool _padToWordBoundaries) const
@@ -285,13 +285,13 @@ void ArrayUtils::copyArrayToMemory(ArrayType const& _sourceType, bool _padToWord
 		if (!_sourceType.isDynamicallySized())
 			m_context << _sourceType.length();
 		if (baseSize > 1)
-			m_context << u256(baseSize) << solidity::Instruction::MUL;
+			m_context << u256(baseSize) << Instruction::MUL;
 		// stack: target source_offset source_len
-		m_context << solidity::Instruction::DUP1 << solidity::Instruction::DUP3 << solidity::Instruction::DUP5;
+		m_context << Instruction::DUP1 << Instruction::DUP3 << Instruction::DUP5;
 		// stack: target source_offset source_len source_len source_offset target
-		m_context << solidity::Instruction::CALLDATACOPY;
-		m_context << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
-		m_context << solidity::Instruction::SWAP2 << solidity::Instruction::POP << solidity::Instruction::POP;
+		m_context << Instruction::CALLDATACOPY;
+		m_context << Instruction::DUP3 << Instruction::ADD;
+		m_context << Instruction::SWAP2 << Instruction::POP << Instruction::POP;
 	}
 	else if (_sourceType.location() == DataLocation::Memory)
 	{
@@ -300,25 +300,25 @@ void ArrayUtils::copyArrayToMemory(ArrayType const& _sourceType, bool _padToWord
 		if (!_sourceType.baseType()->isValueType())
 		{
 			// copy using a loop
-			m_context << u256(0) << solidity::Instruction::SWAP3;
+			m_context << u256(0) << Instruction::SWAP3;
 			// stack: counter source length target
 			auto repeat = m_context.newTag();
 			m_context << repeat;
-			m_context << solidity::Instruction::DUP2 << solidity::Instruction::DUP5;
-			m_context << solidity::Instruction::LT << solidity::Instruction::ISZERO;
+			m_context << Instruction::DUP2 << Instruction::DUP5;
+			m_context << Instruction::LT << Instruction::ISZERO;
 			auto loopEnd = m_context.appendConditionalJump();
-			m_context << solidity::Instruction::DUP3 << solidity::Instruction::DUP5;
+			m_context << Instruction::DUP3 << Instruction::DUP5;
 			accessIndex(_sourceType, false);
 			MemoryItem(m_context, *_sourceType.baseType(), true).retrieveValue(SourceLocation(), true);
 			if (auto baseArray = dynamic_cast<ArrayType const*>(_sourceType.baseType().get()))
 				copyArrayToMemory(*baseArray, _padToWordBoundaries);
 			else
 				utils.storeInMemoryDynamic(*_sourceType.baseType());
-			m_context << solidity::Instruction::SWAP3 << u256(1) << solidity::Instruction::ADD;
-			m_context << solidity::Instruction::SWAP3;
+			m_context << Instruction::SWAP3 << u256(1) << Instruction::ADD;
+			m_context << Instruction::SWAP3;
 			m_context.appendJumpTo(repeat);
 			m_context << loopEnd;
-			m_context << solidity::Instruction::SWAP3;
+			m_context << Instruction::SWAP3;
 			utils.popStackSlots(3);
 			// stack: updated_target_pos
 			return;
@@ -328,18 +328,18 @@ void ArrayUtils::copyArrayToMemory(ArrayType const& _sourceType, bool _padToWord
 		if (_sourceType.isDynamicallySized())
 		{
 			// change pointer to data part
-			m_context << solidity::Instruction::SWAP1 << u256(32) << solidity::Instruction::ADD;
-			m_context << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP1 << u256(32) << Instruction::ADD;
+			m_context << Instruction::SWAP1;
 		}
 		// convert length to size
 		if (baseSize > 1)
-			m_context << u256(baseSize) << solidity::Instruction::MUL;
+			m_context << u256(baseSize) << Instruction::MUL;
 		// stack: <target> <source> <size>
 		//@TODO do not use ::CALL if less than 32 bytes?
-		m_context << solidity::Instruction::DUP1 << solidity::Instruction::DUP4 << solidity::Instruction::DUP4;
+		m_context << Instruction::DUP1 << Instruction::DUP4 << Instruction::DUP4;
 		utils.memoryCopy();
 
-		m_context << solidity::Instruction::SWAP1 << solidity::Instruction::POP;
+		m_context << Instruction::SWAP1 << Instruction::POP;
 		// stack: <target> <size>
 
 		bool paddingNeeded = false;
@@ -350,43 +350,43 @@ void ArrayUtils::copyArrayToMemory(ArrayType const& _sourceType, bool _padToWord
 		if (paddingNeeded)
 		{
 			// stack: <target> <size>
-			m_context << solidity::Instruction::SWAP1 << solidity::Instruction::DUP2 << solidity::Instruction::ADD;
+			m_context << Instruction::SWAP1 << Instruction::DUP2 << Instruction::ADD;
 			// stack: <length> <target + size>
-			m_context << solidity::Instruction::SWAP1 << u256(31) << solidity::Instruction::AND;
+			m_context << Instruction::SWAP1 << u256(31) << Instruction::AND;
 			// stack: <target + size> <remainder = size % 32>
 			eth::AssemblyItem skip = m_context.newTag();
 			if (_sourceType.isDynamicallySized())
 			{
-				m_context << solidity::Instruction::DUP1 << solidity::Instruction::ISZERO;
+				m_context << Instruction::DUP1 << Instruction::ISZERO;
 				m_context.appendConditionalJumpTo(skip);
 			}
 			// round off, load from there.
 			// stack <target + size> <remainder = size % 32>
-			m_context << solidity::Instruction::DUP1 << solidity::Instruction::DUP3;
-			m_context << solidity::Instruction::SUB;
+			m_context << Instruction::DUP1 << Instruction::DUP3;
+			m_context << Instruction::SUB;
 			// stack: target+size remainder <target + size - remainder>
-			m_context << solidity::Instruction::DUP1 << solidity::Instruction::MLOAD;
+			m_context << Instruction::DUP1 << Instruction::MLOAD;
 			// Now we AND it with ~(2**(8 * (32 - remainder)) - 1)
 			m_context << u256(1);
-			m_context << solidity::Instruction::DUP4 << u256(32) << solidity::Instruction::SUB;
+			m_context << Instruction::DUP4 << u256(32) << Instruction::SUB;
 			// stack: ...<v> 1 <32 - remainder>
-			m_context << u256(0x100) << solidity::Instruction::EXP << solidity::Instruction::SUB;
-			m_context << solidity::Instruction::NOT << solidity::Instruction::AND;
+			m_context << u256(0x100) << Instruction::EXP << Instruction::SUB;
+			m_context << Instruction::NOT << Instruction::AND;
 			// stack: target+size remainder target+size-remainder <v & ...>
-			m_context << solidity::Instruction::DUP2 << solidity::Instruction::MSTORE;
+			m_context << Instruction::DUP2 << Instruction::MSTORE;
 			// stack: target+size remainder target+size-remainder
-			m_context << u256(32) << solidity::Instruction::ADD;
+			m_context << u256(32) << Instruction::ADD;
 			// stack: target+size remainder <new_padded_end>
-			m_context << solidity::Instruction::SWAP2 << solidity::Instruction::POP;
+			m_context << Instruction::SWAP2 << Instruction::POP;
 
 			if (_sourceType.isDynamicallySized())
 				m_context << skip.tag();
 			// stack <target + "size"> <remainder = size % 32>
-			m_context << solidity::Instruction::POP;
+			m_context << Instruction::POP;
 		}
 		else
 			// stack: <target> <size>
-			m_context << solidity::Instruction::ADD;
+			m_context << Instruction::ADD;
 	}
 	else
 	{
@@ -398,48 +398,48 @@ void ArrayUtils::copyArrayToMemory(ArrayType const& _sourceType, bool _padToWord
 		retrieveLength(_sourceType);
 		// stack here: memory_offset storage_offset length
 		// jump to end if length is zero
-		m_context << solidity::Instruction::DUP1 << solidity::Instruction::ISZERO;
+		m_context << Instruction::DUP1 << Instruction::ISZERO;
 		eth::AssemblyItem loopEnd = m_context.appendConditionalJump();
 		// Special case for tightly-stored byte arrays
 		if (_sourceType.isByteArray())
 		{
 			// stack here: memory_offset storage_offset length
-			m_context << solidity::Instruction::DUP1 << u256(31) << solidity::Instruction::LT;
+			m_context << Instruction::DUP1 << u256(31) << Instruction::LT;
 			eth::AssemblyItem longByteArray = m_context.appendConditionalJump();
 			// store the short byte array (discard lower-order byte)
-			m_context << u256(0x100) << solidity::Instruction::DUP1;
-			m_context << solidity::Instruction::DUP4 << solidity::Instruction::SLOAD;
-			m_context << solidity::Instruction::DIV << solidity::Instruction::MUL;
-			m_context << solidity::Instruction::DUP4 << solidity::Instruction::MSTORE;
+			m_context << u256(0x100) << Instruction::DUP1;
+			m_context << Instruction::DUP4 << Instruction::SLOAD;
+			m_context << Instruction::DIV << Instruction::MUL;
+			m_context << Instruction::DUP4 << Instruction::MSTORE;
 			// stack here: memory_offset storage_offset length
 			// add 32 or length to memory offset
-			m_context << solidity::Instruction::SWAP2;
+			m_context << Instruction::SWAP2;
 			if (_padToWordBoundaries)
 				m_context << u256(32);
 			else
-				m_context << solidity::Instruction::DUP3;
-			m_context << solidity::Instruction::ADD;
-			m_context << solidity::Instruction::SWAP2;
+				m_context << Instruction::DUP3;
+			m_context << Instruction::ADD;
+			m_context << Instruction::SWAP2;
 			m_context.appendJumpTo(loopEnd);
 			m_context << longByteArray;
 		}
 		// compute memory end offset
 		if (baseSize > 1)
 			// convert length to memory size
-			m_context << u256(baseSize) << solidity::Instruction::MUL;
-		m_context << solidity::Instruction::DUP3 << solidity::Instruction::ADD << solidity::Instruction::SWAP2;
+			m_context << u256(baseSize) << Instruction::MUL;
+		m_context << Instruction::DUP3 << Instruction::ADD << Instruction::SWAP2;
 		if (_sourceType.isDynamicallySized())
 		{
 			// actual array data is stored at SHA3(storage_offset)
-			m_context << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP1;
 			utils.computeHashStatic();
-			m_context << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP1;
 		}
 
 		// stack here: memory_end_offset storage_data_offset memory_offset
 		bool haveByteOffset = !_sourceType.isByteArray() && storageBytes <= 16;
 		if (haveByteOffset)
-			m_context << u256(0) << solidity::Instruction::SWAP1;
+			m_context << u256(0) << Instruction::SWAP1;
 		// stack here: memory_end_offset storage_data_offset [storage_byte_offset] memory_offset
 		eth::AssemblyItem loopStart = m_context.newTag();
 		m_context << loopStart;
@@ -447,20 +447,20 @@ void ArrayUtils::copyArrayToMemory(ArrayType const& _sourceType, bool _padToWord
 		if (_sourceType.isByteArray())
 		{
 			// Packed both in storage and memory.
-			m_context << solidity::Instruction::DUP2 << solidity::Instruction::SLOAD;
-			m_context << solidity::Instruction::DUP2 << solidity::Instruction::MSTORE;
+			m_context << Instruction::DUP2 << Instruction::SLOAD;
+			m_context << Instruction::DUP2 << Instruction::MSTORE;
 			// increment storage_data_offset by 1
-			m_context << solidity::Instruction::SWAP1 << u256(1) << solidity::Instruction::ADD;
+			m_context << Instruction::SWAP1 << u256(1) << Instruction::ADD;
 			// increment memory offset by 32
-			m_context << solidity::Instruction::SWAP1 << u256(32) << solidity::Instruction::ADD;
+			m_context << Instruction::SWAP1 << u256(32) << Instruction::ADD;
 		}
 		else
 		{
 			// stack here: memory_end_offset storage_data_offset [storage_byte_offset] memory_offset
 			if (haveByteOffset)
-				m_context << solidity::Instruction::DUP3 << solidity::Instruction::DUP3;
+				m_context << Instruction::DUP3 << Instruction::DUP3;
 			else
-				m_context << solidity::Instruction::DUP2 << u256(0);
+				m_context << Instruction::DUP2 << u256(0);
 			StorageItem(m_context, *_sourceType.baseType()).retrieveValue(SourceLocation(), true);
 			if (auto baseArray = dynamic_cast<ArrayType const*>(_sourceType.baseType().get()))
 				copyArrayToMemory(*baseArray, _padToWordBoundaries);
@@ -471,29 +471,29 @@ void ArrayUtils::copyArrayToMemory(ArrayType const& _sourceType, bool _padToWord
 				incrementByteOffset(storageBytes, 2, 3);
 			else
 			{
-				m_context << solidity::Instruction::SWAP1;
-				m_context << storageSize << solidity::Instruction::ADD;
-				m_context << solidity::Instruction::SWAP1;
+				m_context << Instruction::SWAP1;
+				m_context << storageSize << Instruction::ADD;
+				m_context << Instruction::SWAP1;
 			}
 		}
 		// check for loop condition
-		m_context << solidity::Instruction::DUP1 << solidity::dupInstruction(haveByteOffset ? 5 : 4);
-		m_context << solidity::Instruction::GT;
+		m_context << Instruction::DUP1 << dupInstruction(haveByteOffset ? 5 : 4);
+		m_context << Instruction::GT;
 		m_context.appendConditionalJumpTo(loopStart);
 		// stack here: memory_end_offset storage_data_offset [storage_byte_offset] memory_offset
 		if (haveByteOffset)
-			m_context << solidity::Instruction::SWAP1 << solidity::Instruction::POP;
+			m_context << Instruction::SWAP1 << Instruction::POP;
 		if (_padToWordBoundaries && baseSize % 32 != 0)
 		{
 			// memory_end_offset - start is the actual length (we want to compute the ceil of).
 			// memory_offset - start is its next multiple of 32, but it might be off by 32.
 			// so we compute: memory_end_offset += (memory_offset - memory_end_offest) & 31
-			m_context << solidity::Instruction::DUP3 << solidity::Instruction::SWAP1 << solidity::Instruction::SUB;
-			m_context << u256(31) << solidity::Instruction::AND;
-			m_context << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
-			m_context << solidity::Instruction::SWAP2;
+			m_context << Instruction::DUP3 << Instruction::SWAP1 << Instruction::SUB;
+			m_context << u256(31) << Instruction::AND;
+			m_context << Instruction::DUP3 << Instruction::ADD;
+			m_context << Instruction::SWAP2;
 		}
-		m_context << loopEnd << solidity::Instruction::POP << solidity::Instruction::POP;
+		m_context << loopEnd << Instruction::POP << Instruction::POP;
 	}
 }
 
@@ -509,20 +509,20 @@ void ArrayUtils::clearArray(ArrayType const& _type) const
 	if (_type.baseType()->isValueType())
 		solAssert(_type.baseType()->storageSize() <= 1, "Invalid size for value type.");
 
-	m_context << solidity::Instruction::POP; // remove byte offset
+	m_context << Instruction::POP; // remove byte offset
 	if (_type.isDynamicallySized())
 		clearDynamicArray(_type);
 	else if (_type.length() == 0 || _type.baseType()->category() == Type::Category::Mapping)
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	else if (_type.baseType()->isValueType() && _type.storageSize() <= 5)
 	{
 		// unroll loop for small arrays @todo choose a good value
 		// Note that we loop over storage slots here, not elements.
 		for (unsigned i = 1; i < _type.storageSize(); ++i)
 			m_context
-				<< u256(0) << solidity::Instruction::DUP2 << solidity::Instruction::SSTORE
-				<< u256(1) << solidity::Instruction::ADD;
-		m_context << u256(0) << solidity::Instruction::SWAP1 << solidity::Instruction::SSTORE;
+				<< u256(0) << Instruction::DUP2 << Instruction::SSTORE
+				<< u256(1) << Instruction::ADD;
+		m_context << u256(0) << Instruction::SWAP1 << Instruction::SSTORE;
 	}
 	else if (!_type.baseType()->isValueType() && _type.length() <= 4)
 	{
@@ -533,22 +533,22 @@ void ArrayUtils::clearArray(ArrayType const& _type) const
 			m_context << u256(0);
 			StorageItem(m_context, *_type.baseType()).setToZero(SourceLocation(), false);
 			m_context
-				<< solidity::Instruction::POP
-				<< u256(_type.baseType()->storageSize()) << solidity::Instruction::ADD;
+				<< Instruction::POP
+				<< u256(_type.baseType()->storageSize()) << Instruction::ADD;
 		}
 		m_context << u256(0);
 		StorageItem(m_context, *_type.baseType()).setToZero(SourceLocation(), true);
 	}
 	else
 	{
-		m_context << solidity::Instruction::DUP1 << _type.length();
+		m_context << Instruction::DUP1 << _type.length();
 		convertLengthToSize(_type);
-		m_context << solidity::Instruction::ADD << solidity::Instruction::SWAP1;
+		m_context << Instruction::ADD << Instruction::SWAP1;
 		if (_type.baseType()->storageBytes() < 32)
 			clearStorageLoop(IntegerType(256));
 		else
 			clearStorageLoop(*_type.baseType());
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	}
 	solAssert(m_context.stackHeight() == stackHeightStart - 2, "");
 }
@@ -561,15 +561,15 @@ void ArrayUtils::clearDynamicArray(ArrayType const& _type) const
 	// fetch length
 	retrieveLength(_type);
 	// set length to zero
-	m_context << u256(0) << solidity::Instruction::DUP3 << solidity::Instruction::SSTORE;
+	m_context << u256(0) << Instruction::DUP3 << Instruction::SSTORE;
 	// Special case: short byte arrays are stored togeher with their length
 	eth::AssemblyItem endTag = m_context.newTag();
 	if (_type.isByteArray())
 	{
 		// stack: ref old_length
-		m_context << solidity::Instruction::DUP1 << u256(31) << solidity::Instruction::LT;
+		m_context << Instruction::DUP1 << u256(31) << Instruction::LT;
 		eth::AssemblyItem longByteArray = m_context.appendConditionalJump();
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 		m_context.appendJumpTo(endTag);
 		m_context.adjustStackOffset(1); // needed because of jump
 		m_context << longByteArray;
@@ -577,11 +577,11 @@ void ArrayUtils::clearDynamicArray(ArrayType const& _type) const
 	// stack: ref old_length
 	convertLengthToSize(_type);
 	// compute data positions
-	m_context << solidity::Instruction::SWAP1;
+	m_context << Instruction::SWAP1;
 	CompilerUtils(m_context).computeHashStatic();
 	// stack: len data_pos
-	m_context << solidity::Instruction::SWAP1 << solidity::Instruction::DUP2 << solidity::Instruction::ADD
-		<< solidity::Instruction::SWAP1;
+	m_context << Instruction::SWAP1 << Instruction::DUP2 << Instruction::ADD
+		<< Instruction::SWAP1;
 	// stack: data_pos_end data_pos
 	if (_type.isByteArray() || _type.baseType()->storageBytes() < 32)
 		clearStorageLoop(IntegerType(256));
@@ -589,7 +589,7 @@ void ArrayUtils::clearDynamicArray(ArrayType const& _type) const
 		clearStorageLoop(*_type.baseType());
 	// cleanup
 	m_context << endTag;
-	m_context << solidity::Instruction::POP;
+	m_context << Instruction::POP;
 }
 
 void ArrayUtils::resizeDynamicArray(ArrayType const& _type) const
@@ -614,13 +614,13 @@ void ArrayUtils::resizeDynamicArray(ArrayType const& _type) const
 		eth::AssemblyItem regularPath = m_context.newTag();
 		// We start by a large case-distinction about the old and new length of the byte array.
 
-		m_context << solidity::Instruction::DUP3 << solidity::Instruction::SLOAD;
+		m_context << Instruction::DUP3 << Instruction::SLOAD;
 		// stack: ref new_length current_length ref_value
 
 		solAssert(m_context.stackHeight() - stackHeightStart == 4 - 2, "3");
-		m_context << solidity::Instruction::DUP2 << u256(31) << solidity::Instruction::LT;
+		m_context << Instruction::DUP2 << u256(31) << Instruction::LT;
 		eth::AssemblyItem currentIsLong = m_context.appendConditionalJump();
-		m_context << solidity::Instruction::DUP3 << u256(31) << solidity::Instruction::LT;
+		m_context << Instruction::DUP3 << u256(31) << Instruction::LT;
 		eth::AssemblyItem newIsLong = m_context.appendConditionalJump();
 
 		// Here: short -> short
@@ -628,17 +628,17 @@ void ArrayUtils::resizeDynamicArray(ArrayType const& _type) const
 		// Compute 1 << (256 - 8 * new_size)
 		eth::AssemblyItem shortToShort = m_context.newTag();
 		m_context << shortToShort;
-		m_context << solidity::Instruction::DUP3 << u256(8) << solidity::Instruction::MUL;
-		m_context << u256(0x100) << solidity::Instruction::SUB;
-		m_context << u256(2) << solidity::Instruction::EXP;
+		m_context << Instruction::DUP3 << u256(8) << Instruction::MUL;
+		m_context << u256(0x100) << Instruction::SUB;
+		m_context << u256(2) << Instruction::EXP;
 		// Divide and multiply by that value, clearing bits.
-		m_context << solidity::Instruction::DUP1 << solidity::Instruction::SWAP2;
-		m_context << solidity::Instruction::DIV << solidity::Instruction::MUL;
+		m_context << Instruction::DUP1 << Instruction::SWAP2;
+		m_context << Instruction::DIV << Instruction::MUL;
 		// Insert 2*length.
-		m_context << solidity::Instruction::DUP3 << solidity::Instruction::DUP1 << solidity::Instruction::ADD;
-		m_context << solidity::Instruction::OR;
+		m_context << Instruction::DUP3 << Instruction::DUP1 << Instruction::ADD;
+		m_context << Instruction::OR;
 		// Store.
-		m_context << solidity::Instruction::DUP4 << solidity::Instruction::SSTORE;
+		m_context << Instruction::DUP4 << Instruction::SSTORE;
 		solAssert(m_context.stackHeight() - stackHeightStart == 3 - 2, "3");
 		m_context.appendJumpTo(resizeEnd);
 
@@ -649,24 +649,24 @@ void ArrayUtils::resizeDynamicArray(ArrayType const& _type) const
 		// stack: ref new_length current_length ref_value
 		solAssert(m_context.stackHeight() - stackHeightStart == 4 - 2, "3");
 		// Zero out lower-order byte.
-		m_context << u256(0xff) << solidity::Instruction::NOT << solidity::Instruction::AND;
+		m_context << u256(0xff) << Instruction::NOT << Instruction::AND;
 		// Store at data location.
-		m_context << solidity::Instruction::DUP4;
+		m_context << Instruction::DUP4;
 		CompilerUtils(m_context).computeHashStatic();
-		m_context << solidity::Instruction::SSTORE;
+		m_context << Instruction::SSTORE;
 		// stack: ref new_length current_length
 		// Store new length: Compule 2*length + 1 and store it.
-		m_context << solidity::Instruction::DUP2 << solidity::Instruction::DUP1 << solidity::Instruction::ADD;
-		m_context << u256(1) << solidity::Instruction::ADD;
+		m_context << Instruction::DUP2 << Instruction::DUP1 << Instruction::ADD;
+		m_context << u256(1) << Instruction::ADD;
 		// stack: ref new_length current_length 2*new_length+1
-		m_context << solidity::Instruction::DUP4 << solidity::Instruction::SSTORE;
+		m_context << Instruction::DUP4 << Instruction::SSTORE;
 		solAssert(m_context.stackHeight() - stackHeightStart == 3 - 2, "3");
 		m_context.appendJumpTo(resizeEnd);
 
 		m_context.adjustStackOffset(1); // we have to do that because of the jumps
 
 		m_context << currentIsLong;
-		m_context << solidity::Instruction::DUP3 << u256(31) << solidity::Instruction::LT;
+		m_context << Instruction::DUP3 << u256(31) << Instruction::LT;
 		m_context.appendConditionalJumpTo(regularPath);
 
 		// Here: long -> short
@@ -675,51 +675,51 @@ void ArrayUtils::resizeDynamicArray(ArrayType const& _type) const
 
 		// stack: ref new_length current_length ref_value
 		solAssert(m_context.stackHeight() - stackHeightStart == 4 - 2, "3");
-		m_context << solidity::Instruction::POP << solidity::Instruction::DUP3;
+		m_context << Instruction::POP << Instruction::DUP3;
 		CompilerUtils(m_context).computeHashStatic();
-		m_context << solidity::Instruction::DUP1 << solidity::Instruction::SLOAD << solidity::Instruction::SWAP1;
+		m_context << Instruction::DUP1 << Instruction::SLOAD << Instruction::SWAP1;
 		// stack: ref new_length current_length first_word data_location
-		m_context << solidity::Instruction::DUP3;
+		m_context << Instruction::DUP3;
 		convertLengthToSize(_type);
-		m_context << solidity::Instruction::DUP2 << solidity::Instruction::ADD << solidity::Instruction::SWAP1;
+		m_context << Instruction::DUP2 << Instruction::ADD << Instruction::SWAP1;
 		// stack: ref new_length current_length first_word data_location_end data_location
 		clearStorageLoop(IntegerType(256));
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 		// stack: ref new_length current_length first_word
 		solAssert(m_context.stackHeight() - stackHeightStart == 4 - 2, "3");
 		m_context.appendJumpTo(shortToShort);
 
 		m_context << regularPath;
 		// stack: ref new_length current_length ref_value
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	}
 
 	// Change of length for a regular array (i.e. length at location, data at sha3(location)).
 	// stack: ref new_length old_length
 	// store new length
-	m_context << solidity::Instruction::DUP2;
+	m_context << Instruction::DUP2;
 	if (_type.isByteArray())
 		// For a "long" byte array, store length as 2*length+1
-		m_context << solidity::Instruction::DUP1 << solidity::Instruction::ADD << u256(1) << solidity::Instruction::ADD;
-	m_context<< solidity::Instruction::DUP4 << solidity::Instruction::SSTORE;
+		m_context << Instruction::DUP1 << Instruction::ADD << u256(1) << Instruction::ADD;
+	m_context<< Instruction::DUP4 << Instruction::SSTORE;
 	// skip if size is not reduced
-	m_context << solidity::Instruction::DUP2 << solidity::Instruction::DUP2
-		<< solidity::Instruction::ISZERO << solidity::Instruction::GT;
+	m_context << Instruction::DUP2 << Instruction::DUP2
+		<< Instruction::ISZERO << Instruction::GT;
 	m_context.appendConditionalJumpTo(resizeEnd);
 
 	// size reduced, clear the end of the array
 	// stack: ref new_length old_length
 	convertLengthToSize(_type);
-	m_context << solidity::Instruction::DUP2;
+	m_context << Instruction::DUP2;
 	convertLengthToSize(_type);
 	// stack: ref new_length old_size new_size
 	// compute data positions
-	m_context << solidity::Instruction::DUP4;
+	m_context << Instruction::DUP4;
 	CompilerUtils(m_context).computeHashStatic();
 	// stack: ref new_length old_size new_size data_pos
-	m_context << solidity::Instruction::SWAP2 << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
+	m_context << Instruction::SWAP2 << Instruction::DUP3 << Instruction::ADD;
 	// stack: ref new_length data_pos new_size delete_end
-	m_context << solidity::Instruction::SWAP2 << solidity::Instruction::ADD;
+	m_context << Instruction::SWAP2 << Instruction::ADD;
 	// stack: ref new_length delete_end delete_start
 	if (_type.isByteArray() || _type.baseType()->storageBytes() < 32)
 		clearStorageLoop(IntegerType(256));
@@ -728,7 +728,7 @@ void ArrayUtils::resizeDynamicArray(ArrayType const& _type) const
 
 	m_context << resizeEnd;
 	// cleanup
-	m_context << solidity::Instruction::POP << solidity::Instruction::POP << solidity::Instruction::POP;
+	m_context << Instruction::POP << Instruction::POP << Instruction::POP;
 	solAssert(m_context.stackHeight() == stackHeightStart - 2, "");
 }
 
@@ -737,35 +737,35 @@ void ArrayUtils::clearStorageLoop(Type const& _type) const
 	unsigned stackHeightStart = m_context.stackHeight();
 	if (_type.category() == Type::Category::Mapping)
 	{
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 		return;
 	}
 	// stack: end_pos pos
 
 	// jump to and return from the loop to allow for duplicate code removal
 	eth::AssemblyItem returnTag = m_context.pushNewTag();
-	m_context << solidity::Instruction::SWAP2 << solidity::Instruction::SWAP1;
+	m_context << Instruction::SWAP2 << Instruction::SWAP1;
 
 	// stack: <return tag> end_pos pos
 	eth::AssemblyItem loopStart = m_context.appendJumpToNew();
 	m_context << loopStart;
 	// check for loop condition
-	m_context << solidity::Instruction::DUP1 << solidity::Instruction::DUP3
-			   << solidity::Instruction::GT << solidity::Instruction::ISZERO;
+	m_context << Instruction::DUP1 << Instruction::DUP3
+			   << Instruction::GT << Instruction::ISZERO;
 	eth::AssemblyItem zeroLoopEnd = m_context.newTag();
 	m_context.appendConditionalJumpTo(zeroLoopEnd);
 	// delete
 	m_context << u256(0);
 	StorageItem(m_context, _type).setToZero(SourceLocation(), false);
-	m_context << solidity::Instruction::POP;
+	m_context << Instruction::POP;
 	// increment
-	m_context << u256(1) << solidity::Instruction::ADD;
+	m_context << u256(1) << Instruction::ADD;
 	m_context.appendJumpTo(loopStart);
 	// cleanup
 	m_context << zeroLoopEnd;
-	m_context << solidity::Instruction::POP << solidity::Instruction::SWAP1;
+	m_context << Instruction::POP << Instruction::SWAP1;
 	// "return"
-	m_context << solidity::Instruction::JUMP;
+	m_context << Instruction::JUMP;
 
 	m_context << returnTag;
 	solAssert(m_context.stackHeight() == stackHeightStart - 1, "");
@@ -779,17 +779,17 @@ void ArrayUtils::convertLengthToSize(ArrayType const& _arrayType, bool _pad) con
 		{
 			unsigned baseBytes = _arrayType.baseType()->storageBytes();
 			if (baseBytes == 0)
-				m_context << solidity::Instruction::POP << u256(1);
+				m_context << Instruction::POP << u256(1);
 			else if (baseBytes <= 16)
 			{
 				unsigned itemsPerSlot = 32 / baseBytes;
 				m_context
-					<< u256(itemsPerSlot - 1) << solidity::Instruction::ADD
-					<< u256(itemsPerSlot) << solidity::Instruction::SWAP1 << solidity::Instruction::DIV;
+					<< u256(itemsPerSlot - 1) << Instruction::ADD
+					<< u256(itemsPerSlot) << Instruction::SWAP1 << Instruction::DIV;
 			}
 		}
 		else
-			m_context << _arrayType.baseType()->storageSize() << solidity::Instruction::MUL;
+			m_context << _arrayType.baseType()->storageSize() << Instruction::MUL;
 	}
 	else
 	{
@@ -799,12 +799,12 @@ void ArrayUtils::convertLengthToSize(ArrayType const& _arrayType, bool _pad) con
 				m_context << _arrayType.baseType()->memoryHeadSize();
 			else
 				m_context << _arrayType.baseType()->calldataEncodedSize();
-			m_context << solidity::Instruction::MUL;
+			m_context << Instruction::MUL;
 		}
 		else if (_pad)
-			m_context << u256(31) << solidity::Instruction::ADD
-				<< u256(32) << solidity::Instruction::DUP1
-				<< solidity::Instruction::SWAP2 << solidity::Instruction::DIV << solidity::Instruction::MUL;
+			m_context << u256(31) << Instruction::ADD
+				<< u256(32) << Instruction::DUP1
+				<< Instruction::SWAP2 << Instruction::DIV << Instruction::MUL;
 	}
 }
 
@@ -814,27 +814,27 @@ void ArrayUtils::retrieveLength(ArrayType const& _arrayType, unsigned _stackDept
 		m_context << _arrayType.length();
 	else
 	{
-		m_context << solidity::dupInstruction(1 + _stackDepth);
+		m_context << dupInstruction(1 + _stackDepth);
 		switch (_arrayType.location())
 		{
 		case DataLocation::CallData:
 			// length is stored on the stack
 			break;
 		case DataLocation::Memory:
-			m_context << solidity::Instruction::MLOAD;
+			m_context << Instruction::MLOAD;
 			break;
 		case DataLocation::Storage:
-			m_context << solidity::Instruction::SLOAD;
+			m_context << Instruction::SLOAD;
 			if (_arrayType.isByteArray())
 			{
 				// Retrieve length both for in-place strings and off-place strings:
 				// Computes (x & (0x100 * (ISZERO (x & 1)) - 1)) / 2
 				// i.e. for short strings (x & 1 == 0) it does (x & 0xff) / 2 and for long strings it
 				// computes (x & (-1)) / 2, which is equivalent to just x / 2.
-				m_context << u256(1) << solidity::Instruction::DUP2 << u256(1) << solidity::Instruction::AND;
-				m_context << solidity::Instruction::ISZERO << u256(0x100) << solidity::Instruction::MUL;
-				m_context << solidity::Instruction::SUB << solidity::Instruction::AND;
-				m_context << u256(2) << solidity::Instruction::SWAP1 << solidity::Instruction::DIV;
+				m_context << u256(1) << Instruction::DUP2 << u256(1) << Instruction::AND;
+				m_context << Instruction::ISZERO << u256(0x100) << Instruction::MUL;
+				m_context << Instruction::SUB << Instruction::AND;
+				m_context << u256(2) << Instruction::SWAP1 << Instruction::DIV;
 			}
 			break;
 		}
@@ -852,34 +852,34 @@ void ArrayUtils::accessIndex(ArrayType const& _arrayType, bool _doBoundsCheck) c
 		ArrayUtils::retrieveLength(_arrayType, 1);
 		// Stack: ref [length] index length
 		// check out-of-bounds access
-		m_context << solidity::Instruction::DUP2 << solidity::Instruction::LT << solidity::Instruction::ISZERO;
+		m_context << Instruction::DUP2 << Instruction::LT << Instruction::ISZERO;
 		// out-of-bounds access throws exception
 		m_context.appendConditionalJumpTo(m_context.errorTag());
 	}
 	if (location == DataLocation::CallData && _arrayType.isDynamicallySized())
 		// remove length if present
-		m_context << solidity::Instruction::SWAP1 << solidity::Instruction::POP;
+		m_context << Instruction::SWAP1 << Instruction::POP;
 
 	// stack: <base_ref> <index>
-	m_context << solidity::Instruction::SWAP1;
+	m_context << Instruction::SWAP1;
 	// stack: <index> <base_ref>
 	switch (location)
 	{
 	case DataLocation::Memory:
 		if (_arrayType.isDynamicallySized())
-			m_context << u256(32) << solidity::Instruction::ADD;
+			m_context << u256(32) << Instruction::ADD;
 		// fall-through
 	case DataLocation::CallData:
 		if (!_arrayType.isByteArray())
 		{
-			m_context << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP1;
 			if (location == DataLocation::CallData)
 				m_context << _arrayType.baseType()->calldataEncodedSize();
 			else
 				m_context << u256(_arrayType.memoryHeadSize());
-			m_context << solidity::Instruction::MUL;
+			m_context << Instruction::MUL;
 		}
-		m_context << solidity::Instruction::ADD;
+		m_context << Instruction::ADD;
 		break;
 	case DataLocation::Storage:
 	{
@@ -887,16 +887,16 @@ void ArrayUtils::accessIndex(ArrayType const& _arrayType, bool _doBoundsCheck) c
 		if (_arrayType.isByteArray())
 		{
 			// Special case of short byte arrays.
-			m_context << solidity::Instruction::SWAP1;
-			m_context << solidity::Instruction::DUP2 << solidity::Instruction::SLOAD;
-			m_context << u256(1) << solidity::Instruction::AND << solidity::Instruction::ISZERO;
+			m_context << Instruction::SWAP1;
+			m_context << Instruction::DUP2 << Instruction::SLOAD;
+			m_context << u256(1) << Instruction::AND << Instruction::ISZERO;
 			// No action needed for short byte arrays.
 			m_context.appendConditionalJumpTo(endTag);
-			m_context << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP1;
 		}
 		if (_arrayType.isDynamicallySized())
 			CompilerUtils(m_context).computeHashStatic();
-		m_context << solidity::Instruction::SWAP1;
+		m_context << Instruction::SWAP1;
 		if (_arrayType.baseType()->storageBytes() <= 16)
 		{
 			// stack: <data_ref> <index>
@@ -905,22 +905,22 @@ void ArrayUtils::accessIndex(ArrayType const& _arrayType, bool _doBoundsCheck) c
 			unsigned byteSize = _arrayType.baseType()->storageBytes();
 			solAssert(byteSize != 0, "");
 			unsigned itemsPerSlot = 32 / byteSize;
-			m_context << u256(itemsPerSlot) << solidity::Instruction::SWAP2;
+			m_context << u256(itemsPerSlot) << Instruction::SWAP2;
 			// stack: itemsPerSlot index data_ref
 			m_context
-				<< solidity::Instruction::DUP3 << solidity::Instruction::DUP3
-				<< solidity::Instruction::DIV << solidity::Instruction::ADD
+				<< Instruction::DUP3 << Instruction::DUP3
+				<< Instruction::DIV << Instruction::ADD
 			// stack: itemsPerSlot index (data_ref + index / itemsPerSlot)
-				<< solidity::Instruction::SWAP2 << solidity::Instruction::SWAP1
-				<< solidity::Instruction::MOD;
+				<< Instruction::SWAP2 << Instruction::SWAP1
+				<< Instruction::MOD;
 			if (byteSize != 1)
-				m_context << u256(byteSize) << solidity::Instruction::MUL;
+				m_context << u256(byteSize) << Instruction::MUL;
 		}
 		else
 		{
 			if (_arrayType.baseType()->storageSize() != 1)
-				m_context << _arrayType.baseType()->storageSize() << solidity::Instruction::MUL;
-			m_context << solidity::Instruction::ADD << u256(0);
+				m_context << _arrayType.baseType()->storageSize() << Instruction::MUL;
+			m_context << Instruction::ADD << u256(0);
 		}
 		m_context << endTag;
 		break;
@@ -942,27 +942,27 @@ void ArrayUtils::incrementByteOffset(unsigned _byteSize, unsigned _byteOffsetPos
 	//     byteOffset = 0;
 	// }
 	if (_byteOffsetPosition > 1)
-		m_context << solidity::swapInstruction(_byteOffsetPosition - 1);
-	m_context << u256(_byteSize) << solidity::Instruction::ADD;
+		m_context << swapInstruction(_byteOffsetPosition - 1);
+	m_context << u256(_byteSize) << Instruction::ADD;
 	if (_byteOffsetPosition > 1)
-		m_context << solidity::swapInstruction(_byteOffsetPosition - 1);
+		m_context << swapInstruction(_byteOffsetPosition - 1);
 	// compute, X := (byteOffset + byteSize - 1) / 32, should be 1 iff byteOffset + bytesize > 32
 	m_context
-		<< u256(32) << solidity::dupInstruction(1 + _byteOffsetPosition) << u256(_byteSize - 1)
-		<< solidity::Instruction::ADD << solidity::Instruction::DIV;
+		<< u256(32) << dupInstruction(1 + _byteOffsetPosition) << u256(_byteSize - 1)
+		<< Instruction::ADD << Instruction::DIV;
 	// increment storage offset if X == 1 (just add X to it)
 	// stack: X
 	m_context
-		<< solidity::swapInstruction(_storageOffsetPosition) << solidity::dupInstruction(_storageOffsetPosition + 1)
-		<< solidity::Instruction::ADD << solidity::swapInstruction(_storageOffsetPosition);
+		<< swapInstruction(_storageOffsetPosition) << dupInstruction(_storageOffsetPosition + 1)
+		<< Instruction::ADD << swapInstruction(_storageOffsetPosition);
 	// stack: X
 	// set source_byte_offset to zero if X == 1 (using source_byte_offset *= 1 - X)
-	m_context << u256(1) << solidity::Instruction::SUB;
+	m_context << u256(1) << Instruction::SUB;
 	// stack: 1 - X
 	if (_byteOffsetPosition == 1)
-		m_context << solidity::Instruction::MUL;
+		m_context << Instruction::MUL;
 	else
 		m_context
-			<< solidity::dupInstruction(_byteOffsetPosition + 1) << solidity::Instruction::MUL
-			<< solidity::swapInstruction(_byteOffsetPosition) << solidity::Instruction::POP;
+			<< dupInstruction(_byteOffsetPosition + 1) << Instruction::MUL
+			<< swapInstruction(_byteOffsetPosition) << Instruction::POP;
 }
diff --git a/libsolidity/codegen/Compiler.cpp b/libsolidity/codegen/Compiler.cpp
index 8ea59a66..8b718fca 100644
--- a/libsolidity/codegen/Compiler.cpp
+++ b/libsolidity/codegen/Compiler.cpp
@@ -92,8 +92,8 @@ void Compiler::compileClone(
 	m_runtimeSub = size_t(runtimeSub.data());
 
 	// stack contains sub size
-	m_context << solidity::Instruction::DUP1 << runtimeSub << u256(0) << solidity::Instruction::CODECOPY;
-	m_context << u256(0) << solidity::Instruction::RETURN;
+	m_context << Instruction::DUP1 << runtimeSub << u256(0) << Instruction::CODECOPY;
+	m_context << u256(0) << Instruction::RETURN;
 
 	appendFunctionsWithoutCode();
 
@@ -164,8 +164,8 @@ void Compiler::packIntoContractCreator(ContractDefinition const& _contract, Comp
 	m_runtimeSub = size_t(runtimeSub.data());
 
 	// stack contains sub size
-	m_context << solidity::Instruction::DUP1 << runtimeSub << u256(0) << solidity::Instruction::CODECOPY;
-	m_context << u256(0) << solidity::Instruction::RETURN;
+	m_context << Instruction::DUP1 << runtimeSub << u256(0) << Instruction::CODECOPY;
+	m_context << u256(0) << Instruction::RETURN;
 
 	// note that we have to include the functions again because of absolute jump labels
 	appendFunctionsWithoutCode();
@@ -208,15 +208,15 @@ void Compiler::appendConstructor(FunctionDefinition const& _constructor)
 			// argument size is dynamic, use CODESIZE to determine it
 			m_context.appendProgramSize(); // program itself
 			// CODESIZE is program plus manually added arguments
-			m_context << solidity::Instruction::CODESIZE << solidity::Instruction::SUB;
+			m_context << Instruction::CODESIZE << Instruction::SUB;
 		}
 		else
 			m_context << u256(argumentSize);
 		// stack: <memptr> <argument size>
-		m_context << solidity::Instruction::DUP1;
+		m_context << Instruction::DUP1;
 		m_context.appendProgramSize();
-		m_context << solidity::Instruction::DUP4 << solidity::Instruction::CODECOPY;
-		m_context << solidity::Instruction::DUP2 << solidity::Instruction::ADD;
+		m_context << Instruction::DUP4 << Instruction::CODECOPY;
+		m_context << Instruction::DUP2 << Instruction::ADD;
 		CompilerUtils(m_context).storeFreeMemoryPointer();
 		// stack: <memptr>
 		appendCalldataUnpacker(FunctionType(_constructor).parameterTypes(), true);
@@ -235,7 +235,7 @@ void Compiler::appendFunctionSelector(ContractDefinition const& _contract)
 	// ether with constant gas
 	if (interfaceFunctions.size() > 5 || fallback)
 	{
-		m_context << solidity::Instruction::CALLDATASIZE << solidity::Instruction::ISZERO;
+		m_context << Instruction::CALLDATASIZE << Instruction::ISZERO;
 		m_context.appendConditionalJumpTo(notFound);
 	}
 
@@ -247,7 +247,7 @@ void Compiler::appendFunctionSelector(ContractDefinition const& _contract)
 	for (auto const& it: interfaceFunctions)
 	{
 		callDataUnpackerEntryPoints.insert(std::make_pair(it.first, m_context.newTag()));
-		m_context << solidity::dupInstruction(1) << u256(FixedHash<4>::Arith(it.first)) << solidity::Instruction::EQ;
+		m_context << dupInstruction(1) << u256(FixedHash<4>::Arith(it.first)) << Instruction::EQ;
 		m_context.appendConditionalJumpTo(callDataUnpackerEntryPoints.at(it.first));
 	}
 	m_context.appendJumpTo(notFound);
@@ -264,7 +264,7 @@ void Compiler::appendFunctionSelector(ContractDefinition const& _contract)
 		// Reject invalid library calls and ether sent to a library.
 		m_context.appendJumpTo(m_context.errorTag());
 	else
-		m_context << solidity::Instruction::STOP; // function not found
+		m_context << Instruction::STOP; // function not found
 
 	for (auto const& it: interfaceFunctions)
 	{
@@ -288,7 +288,7 @@ void Compiler::appendCalldataUnpacker(TypePointers const& _typeParameters, bool
 	//@todo this does not yet support nested dynamic arrays
 
 	// Retain the offset pointer as base_offset, the point from which the data offsets are computed.
-	m_context << solidity::Instruction::DUP1;
+	m_context << Instruction::DUP1;
 	for (TypePointer const& parameterType: _typeParameters)
 	{
 		// stack: v1 v2 ... v(k-1) base_offset current_offset
@@ -309,15 +309,15 @@ void Compiler::appendCalldataUnpacker(TypePointers const& _typeParameters, bool
 				if (arrayType.isDynamicallySized())
 				{
 					// compute data pointer
-					m_context << solidity::Instruction::DUP1 << solidity::Instruction::MLOAD;
-					m_context << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
-					m_context << solidity::Instruction::SWAP2 << solidity::Instruction::SWAP1;
-					m_context << u256(0x20) << solidity::Instruction::ADD;
+					m_context << Instruction::DUP1 << Instruction::MLOAD;
+					m_context << Instruction::DUP3 << Instruction::ADD;
+					m_context << Instruction::SWAP2 << Instruction::SWAP1;
+					m_context << u256(0x20) << Instruction::ADD;
 				}
 				else
 				{
-					m_context << solidity::Instruction::DUP1;
-					m_context << u256(arrayType.calldataEncodedSize(true)) << solidity::Instruction::ADD;
+					m_context << Instruction::DUP1;
+					m_context << u256(arrayType.calldataEncodedSize(true)) << Instruction::ADD;
 				}
 			}
 			else
@@ -329,19 +329,19 @@ void Compiler::appendCalldataUnpacker(TypePointers const& _typeParameters, bool
 					// put on stack: data_pointer length
 					CompilerUtils(m_context).loadFromMemoryDynamic(IntegerType(256), !_fromMemory);
 					// stack: base_offset data_offset next_pointer
-					m_context << solidity::Instruction::SWAP1 << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
+					m_context << Instruction::SWAP1 << Instruction::DUP3 << Instruction::ADD;
 					// stack: base_offset next_pointer data_pointer
 					// retrieve length
 					CompilerUtils(m_context).loadFromMemoryDynamic(IntegerType(256), !_fromMemory, true);
 					// stack: base_offset next_pointer length data_pointer
-					m_context << solidity::Instruction::SWAP2;
+					m_context << Instruction::SWAP2;
 					// stack: base_offset data_pointer length next_pointer
 				}
 				else
 				{
 					// leave the pointer on the stack
-					m_context << solidity::Instruction::DUP1;
-					m_context << u256(calldataType->calldataEncodedSize()) << solidity::Instruction::ADD;
+					m_context << Instruction::DUP1;
+					m_context << u256(calldataType->calldataEncodedSize()) << Instruction::ADD;
 				}
 				if (arrayType.location() == DataLocation::Memory)
 				{
@@ -355,7 +355,7 @@ void Compiler::appendCalldataUnpacker(TypePointers const& _typeParameters, bool
 				}
 				// move base_offset up
 				CompilerUtils(m_context).moveToStackTop(1 + arrayType.sizeOnStack());
-				m_context << solidity::Instruction::SWAP1;
+				m_context << Instruction::SWAP1;
 			}
 		}
 		else
@@ -363,18 +363,18 @@ void Compiler::appendCalldataUnpacker(TypePointers const& _typeParameters, bool
 			solAssert(!type->isDynamicallySized(), "Unknown dynamically sized type: " + type->toString());
 			CompilerUtils(m_context).loadFromMemoryDynamic(*type, !_fromMemory, true);
 			CompilerUtils(m_context).moveToStackTop(1 + type->sizeOnStack());
-			m_context << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP1;
 		}
 		// stack: v1 v2 ... v(k-1) v(k) base_offset mem_offset
 	}
-	m_context << solidity::Instruction::POP << solidity::Instruction::POP;
+	m_context << Instruction::POP << Instruction::POP;
 }
 
 void Compiler::appendReturnValuePacker(TypePointers const& _typeParameters, bool _isLibrary)
 {
 	CompilerUtils utils(m_context);
 	if (_typeParameters.empty())
-		m_context << solidity::Instruction::STOP;
+		m_context << Instruction::STOP;
 	else
 	{
 		utils.fetchFreeMemoryPointer();
@@ -382,7 +382,7 @@ void Compiler::appendReturnValuePacker(TypePointers const& _typeParameters, bool
 		// its data to add the needed parts and we avoid a memory copy.
 		utils.encodeToMemory(_typeParameters, _typeParameters, true, false, _isLibrary);
 		utils.toSizeAfterFreeMemoryPointer();
-		m_context << solidity::Instruction::RETURN;
+		m_context << Instruction::RETURN;
 	}
 }
 
@@ -476,12 +476,12 @@ bool Compiler::visit(FunctionDefinition const& _function)
 	while (stackLayout.back() != int(stackLayout.size() - 1))
 		if (stackLayout.back() < 0)
 		{
-			m_context << solidity::Instruction::POP;
+			m_context << Instruction::POP;
 			stackLayout.pop_back();
 		}
 		else
 		{
-			m_context << solidity::swapInstruction(stackLayout.size() - stackLayout.back() - 1);
+			m_context << swapInstruction(stackLayout.size() - stackLayout.back() - 1);
 			swap(stackLayout[stackLayout.back()], stackLayout.back());
 		}
 	//@todo assert that everything is in place now
@@ -532,7 +532,7 @@ bool Compiler::visit(InlineAssembly const& _inlineAssembly)
 								errinfo_comment("Stack too deep, try removing local variables.")
 							);
 						for (unsigned i = 0; i < variable->type()->sizeOnStack(); ++i)
-							_assembly.append(solidity::dupInstruction(stackDiff));
+							_assembly.append(dupInstruction(stackDiff));
 					}
 					else
 					{
@@ -572,8 +572,8 @@ bool Compiler::visit(InlineAssembly const& _inlineAssembly)
 						errinfo_comment("Stack too deep, try removing local variables.")
 					);
 				for (unsigned i = 0; i < size; ++i) {
-					_assembly.append(solidity::swapInstruction(stackDiff));
-					_assembly.append(solidity::Instruction::POP);
+					_assembly.append(swapInstruction(stackDiff));
+					_assembly.append(Instruction::POP);
 				}
 			}
 			return true;
@@ -588,7 +588,7 @@ bool Compiler::visit(IfStatement const& _ifStatement)
 	StackHeightChecker checker(m_context);
 	CompilerContext::LocationSetter locationSetter(m_context, _ifStatement);
 	compileExpression(_ifStatement.condition());
-	m_context << solidity::Instruction::ISZERO;
+	m_context << Instruction::ISZERO;
 	eth::AssemblyItem falseTag = m_context.appendConditionalJump();
 	eth::AssemblyItem endTag = falseTag;
 	_ifStatement.trueStatement().accept(*this);
@@ -615,7 +615,7 @@ bool Compiler::visit(WhileStatement const& _whileStatement)
 
 	m_context << loopStart;
 	compileExpression(_whileStatement.condition());
-	m_context << solidity::Instruction::ISZERO;
+	m_context << Instruction::ISZERO;
 	m_context.appendConditionalJumpTo(loopEnd);
 
 	_whileStatement.body().accept(*this);
@@ -649,7 +649,7 @@ bool Compiler::visit(ForStatement const& _forStatement)
 	if (_forStatement.condition())
 	{
 		compileExpression(*_forStatement.condition());
-		m_context << solidity::Instruction::ISZERO;
+		m_context << Instruction::ISZERO;
 		m_context.appendConditionalJumpTo(loopEnd);
 	}
 
@@ -710,7 +710,7 @@ bool Compiler::visit(Return const& _return)
 			CompilerUtils(m_context).moveToStackVariable(*retVariable);
 	}
 	for (unsigned i = 0; i < m_stackCleanupForReturn; ++i)
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	m_context.appendJumpTo(m_returnTag);
 	m_context.adjustStackOffset(m_stackCleanupForReturn);
 	return false;
@@ -831,7 +831,7 @@ void Compiler::appendModifierOrFunctionCode()
 		modifier.body().accept(*this);
 
 		for (unsigned i = 0; i < c_stackSurplus; ++i)
-			m_context << solidity::Instruction::POP;
+			m_context << Instruction::POP;
 		m_stackCleanupForReturn -= c_stackSurplus;
 	}
 }
@@ -855,20 +855,20 @@ eth::Assembly Compiler::cloneRuntime()
 {
 	eth::EVMSchedule schedule;
 	eth::Assembly a;
-	a << solidity::Instruction::CALLDATASIZE;
-	a << u256(0) << solidity::Instruction::DUP1 << solidity::Instruction::CALLDATACOPY;
+	a << Instruction::CALLDATASIZE;
+	a << u256(0) << Instruction::DUP1 << Instruction::CALLDATACOPY;
 	//@todo adjust for larger return values, make this dynamic.
-	a << u256(0x20) << u256(0) << solidity::Instruction::CALLDATASIZE;
+	a << u256(0x20) << u256(0) << Instruction::CALLDATASIZE;
 	a << u256(0);
 	// this is the address which has to be substituted by the linker.
 	//@todo implement as special "marker" AssemblyItem.
 	a << u256("0xcafecafecafecafecafecafecafecafecafecafe");
-	a << u256(schedule.callGas + 10) << solidity::Instruction::GAS << solidity::Instruction::SUB;
-	a << solidity::Instruction::DELEGATECALL;
+	a << u256(schedule.callGas + 10) << Instruction::GAS << Instruction::SUB;
+	a << Instruction::DELEGATECALL;
 	//Propagate error condition (if DELEGATECALL pushes 0 on stack).
-	a << solidity::Instruction::ISZERO;
+	a << Instruction::ISZERO;
 	a.appendJumpI(a.errorTag());
 	//@todo adjust for larger return values, make this dynamic.
-	a << u256(0x20) << u256(0) << solidity::Instruction::RETURN;
+	a << u256(0x20) << u256(0) << Instruction::RETURN;
 	return a;
 }
diff --git a/libsolidity/codegen/CompilerContext.cpp b/libsolidity/codegen/CompilerContext.cpp
index a2384796..7810288e 100644
--- a/libsolidity/codegen/CompilerContext.cpp
+++ b/libsolidity/codegen/CompilerContext.cpp
@@ -166,7 +166,7 @@ pair<u256, unsigned> CompilerContext::storageLocationOfVariable(const Declaratio
 
 CompilerContext& CompilerContext::appendJump(eth::AssemblyItem::JumpType _jumpType)
 {
-	eth::AssemblyItem item(solidity::Instruction::JUMP);
+	eth::AssemblyItem item(Instruction::JUMP);
 	item.setJumpType(_jumpType);
 	return *this << item;
 }
@@ -182,7 +182,7 @@ void CompilerContext::resetVisitedNodes(ASTNode const* _node)
 void CompilerContext::injectVersionStampIntoSub(size_t _subIndex)
 {
 	eth::Assembly& sub = m_asm.sub(_subIndex);
-	sub.injectStart(solidity::Instruction::POP);
+	sub.injectStart(Instruction::POP);
 	sub.injectStart(fromBigEndian<u256>(binaryVersion()));
 }
 
diff --git a/libsolidity/codegen/CompilerContext.h b/libsolidity/codegen/CompilerContext.h
index e987bcd8..9368dbcf 100644
--- a/libsolidity/codegen/CompilerContext.h
+++ b/libsolidity/codegen/CompilerContext.h
@@ -126,7 +126,7 @@ public:
 
 	/// Append elements to the current instruction list and adjust @a m_stackOffset.
 	CompilerContext& operator<<(eth::AssemblyItem const& _item) { m_asm.append(_item); return *this; }
-	CompilerContext& operator<<(solidity::Instruction _instruction) { m_asm.append(_instruction); return *this; }
+	CompilerContext& operator<<(Instruction _instruction) { m_asm.append(_instruction); return *this; }
 	CompilerContext& operator<<(u256 const& _value) { m_asm.append(_value); return *this; }
 	CompilerContext& operator<<(bytes const& _data) { m_asm.append(_data); return *this; }
 
diff --git a/libsolidity/codegen/CompilerUtils.cpp b/libsolidity/codegen/CompilerUtils.cpp
index 4a68fc03..36ed480e 100644
--- a/libsolidity/codegen/CompilerUtils.cpp
+++ b/libsolidity/codegen/CompilerUtils.cpp
@@ -45,26 +45,26 @@ void CompilerUtils::initialiseFreeMemoryPointer()
 
 void CompilerUtils::fetchFreeMemoryPointer()
 {
-	m_context << u256(freeMemoryPointer) << solidity::Instruction::MLOAD;
+	m_context << u256(freeMemoryPointer) << Instruction::MLOAD;
 }
 
 void CompilerUtils::storeFreeMemoryPointer()
 {
-	m_context << u256(freeMemoryPointer) << solidity::Instruction::MSTORE;
+	m_context << u256(freeMemoryPointer) << Instruction::MSTORE;
 }
 
 void CompilerUtils::allocateMemory()
 {
 	fetchFreeMemoryPointer();
-	m_context << solidity::Instruction::SWAP1 << solidity::Instruction::DUP2 << solidity::Instruction::ADD;
+	m_context << Instruction::SWAP1 << Instruction::DUP2 << Instruction::ADD;
 	storeFreeMemoryPointer();
 }
 
 void CompilerUtils::toSizeAfterFreeMemoryPointer()
 {
 	fetchFreeMemoryPointer();
-	m_context << solidity::Instruction::DUP1 << solidity::Instruction::SWAP2 << solidity::Instruction::SUB;
-	m_context << solidity::Instruction::SWAP1;
+	m_context << Instruction::DUP1 << Instruction::SWAP2 << Instruction::SUB;
+	m_context << Instruction::SWAP1;
 }
 
 unsigned CompilerUtils::loadFromMemory(
@@ -87,7 +87,7 @@ void CompilerUtils::loadFromMemoryDynamic(
 )
 {		
 	if (_keepUpdatedMemoryOffset)
-		m_context << solidity::Instruction::DUP1;
+		m_context << Instruction::DUP1;
 
 	if (auto arrayType = dynamic_cast<ArrayType const*>(&_type))
 	{
@@ -95,7 +95,7 @@ void CompilerUtils::loadFromMemoryDynamic(
 		solAssert(!_fromCalldata, "");
 		solAssert(_padToWordBoundaries, "");
 		if (_keepUpdatedMemoryOffset)
-			m_context << arrayType->memorySize() << solidity::Instruction::ADD;
+			m_context << arrayType->memorySize() << Instruction::ADD;
 	}
 	else
 	{
@@ -104,7 +104,7 @@ void CompilerUtils::loadFromMemoryDynamic(
 		{
 			// update memory counter
 			moveToStackTop(_type.sizeOnStack());
-			m_context << u256(numBytes) << solidity::Instruction::ADD;
+			m_context << u256(numBytes) << Instruction::ADD;
 		}
 	}
 }
@@ -113,7 +113,7 @@ void CompilerUtils::storeInMemory(unsigned _offset)
 {
 	unsigned numBytes = prepareMemoryStore(IntegerType(256), true);
 	if (numBytes > 0)
-		m_context << u256(_offset) << solidity::Instruction::MSTORE;
+		m_context << u256(_offset) << Instruction::MSTORE;
 }
 
 void CompilerUtils::storeInMemoryDynamic(Type const& _type, bool _padToWordBoundaries)
@@ -125,13 +125,13 @@ void CompilerUtils::storeInMemoryDynamic(Type const& _type, bool _padToWordBound
 	}
 	else if (auto str = dynamic_cast<StringLiteralType const*>(&_type))
 	{
-		m_context << solidity::Instruction::DUP1;
+		m_context << Instruction::DUP1;
 		storeStringData(bytesConstRef(str->value()));
 		if (_padToWordBoundaries)
 			m_context << u256(((str->value().size() + 31) / 32) * 32);
 		else
 			m_context << u256(str->value().size());
-		m_context << solidity::Instruction::ADD;
+		m_context << Instruction::ADD;
 	}
 	else
 	{
@@ -142,8 +142,8 @@ void CompilerUtils::storeInMemoryDynamic(Type const& _type, bool _padToWordBound
 				_type.sizeOnStack() == 1,
 				"Memory store of types with stack size != 1 not implemented."
 			);
-			m_context << solidity::Instruction::DUP2 << solidity::Instruction::MSTORE;
-			m_context << u256(numBytes) << solidity::Instruction::ADD;
+			m_context << Instruction::DUP2 << Instruction::MSTORE;
+			m_context << u256(numBytes) << Instruction::ADD;
 		}
 	}
 }
@@ -168,7 +168,7 @@ void CompilerUtils::encodeToMemory(
 	// of the ith dynamic parameter, which is filled once the dynamic parts are processed.
 
 	// store memory start pointer
-	m_context << solidity::Instruction::DUP1;
+	m_context << Instruction::DUP1;
 
 	unsigned argSize = CompilerUtils::sizeOnStack(_givenTypes);
 	unsigned stackPos = 0; // advances through the argument values
@@ -180,7 +180,7 @@ void CompilerUtils::encodeToMemory(
 		if (targetType->isDynamicallySized() && !_copyDynamicDataInPlace)
 		{
 			// leave end_of_mem as dyn head pointer
-			m_context << solidity::Instruction::DUP1 << u256(32) << solidity::Instruction::ADD;
+			m_context << Instruction::DUP1 << u256(32) << Instruction::ADD;
 			dynPointers++;
 		}
 		else
@@ -222,10 +222,10 @@ void CompilerUtils::encodeToMemory(
 		if (targetType->isDynamicallySized() && !_copyDynamicDataInPlace)
 		{
 			// copy tail pointer (=mem_end - mem_start) to memory
-			m_context << solidity::dupInstruction(2 + dynPointers) << solidity::Instruction::DUP2;
-			m_context << solidity::Instruction::SUB;
-			m_context << solidity::dupInstruction(2 + dynPointers - thisDynPointer);
-			m_context << solidity::Instruction::MSTORE;
+			m_context << dupInstruction(2 + dynPointers) << Instruction::DUP2;
+			m_context << Instruction::SUB;
+			m_context << dupInstruction(2 + dynPointers - thisDynPointer);
+			m_context << Instruction::MSTORE;
 			// stack: ... <end_of_mem>
 			if (_givenTypes[i]->category() == Type::Category::StringLiteral)
 			{
@@ -243,13 +243,13 @@ void CompilerUtils::encodeToMemory(
 				copyToStackTop(argSize - stackPos + dynPointers + 2, arrayType.sizeOnStack());
 				// stack: ... <end_of_mem> <value...>
 				// copy length to memory
-				m_context << solidity::dupInstruction(1 + arrayType.sizeOnStack());
+				m_context << dupInstruction(1 + arrayType.sizeOnStack());
 				ArrayUtils(m_context).retrieveLength(arrayType, 1);
 				// stack: ... <end_of_mem> <value...> <end_of_mem'> <length>
 				storeInMemoryDynamic(IntegerType(256), true);
 				// stack: ... <end_of_mem> <value...> <end_of_mem''>
 				// copy the new memory pointer
-				m_context << solidity::swapInstruction(arrayType.sizeOnStack() + 1) << solidity::Instruction::POP;
+				m_context << swapInstruction(arrayType.sizeOnStack() + 1) << Instruction::POP;
 				// stack: ... <end_of_mem''> <value...>
 				// copy data part
 				ArrayUtils(m_context).copyArrayToMemory(arrayType, _padToWordBoundaries);
@@ -262,7 +262,7 @@ void CompilerUtils::encodeToMemory(
 	}
 
 	// remove unneeded stack elements (and retain memory pointer)
-	m_context << solidity::swapInstruction(argSize + dynPointers + 1);
+	m_context << swapInstruction(argSize + dynPointers + 1);
 	popStackSlots(argSize + dynPointers + 1);
 }
 
@@ -272,11 +272,11 @@ void CompilerUtils::zeroInitialiseMemoryArray(ArrayType const& _type)
 	m_context << repeat;
 	pushZeroValue(*_type.baseType());
 	storeInMemoryDynamic(*_type.baseType());
-	m_context << solidity::Instruction::SWAP1 << u256(1) << solidity::Instruction::SWAP1;
-	m_context << solidity::Instruction::SUB << solidity::Instruction::SWAP1;
-	m_context << solidity::Instruction::DUP2;
+	m_context << Instruction::SWAP1 << u256(1) << Instruction::SWAP1;
+	m_context << Instruction::SUB << Instruction::SWAP1;
+	m_context << Instruction::DUP2;
 	m_context.appendConditionalJumpTo(repeat);
-	m_context << solidity::Instruction::SWAP1 << solidity::Instruction::POP;
+	m_context << Instruction::SWAP1 << Instruction::POP;
 }
 
 void CompilerUtils::memoryCopy()
@@ -284,16 +284,16 @@ void CompilerUtils::memoryCopy()
 	// Stack here: size target source
 	// stack for call: outsize target size source value contract gas
 	//@TODO do not use ::CALL if less than 32 bytes?
-	m_context << solidity::Instruction::DUP3 << solidity::Instruction::SWAP1;
+	m_context << Instruction::DUP3 << Instruction::SWAP1;
 	m_context << u256(0) << u256(identityContractAddress);
 	// compute gas costs
-	m_context << u256(32) << solidity::Instruction::DUP5 << u256(31) << solidity::Instruction::ADD;
+	m_context << u256(32) << Instruction::DUP5 << u256(31) << Instruction::ADD;
 	static unsigned c_identityGas = 3;
 	static unsigned c_identityWordGas = 15;
-	m_context << solidity::Instruction::DIV << u256(c_identityWordGas) << solidity::Instruction::MUL;
-	m_context << u256(c_identityGas) << solidity::Instruction::ADD;
-	m_context << solidity::Instruction::CALL;
-	m_context << solidity::Instruction::POP; // ignore return value
+	m_context << Instruction::DIV << u256(c_identityWordGas) << Instruction::MUL;
+	m_context << u256(c_identityGas) << Instruction::ADD;
+	m_context << Instruction::CALL;
+	m_context << Instruction::POP; // ignore return value
 }
 
 void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetType, bool _cleanupNeeded)
@@ -317,7 +317,7 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 			// conversion from bytes to integer. no need to clean the high bit
 			// only to shift right because of opposite alignment
 			IntegerType const& targetIntegerType = dynamic_cast<IntegerType const&>(_targetType);
-			m_context << (u256(1) << (256 - typeOnStack.numBytes() * 8)) << solidity::Instruction::SWAP1 << solidity::Instruction::DIV;
+			m_context << (u256(1) << (256 - typeOnStack.numBytes() * 8)) << Instruction::SWAP1 << Instruction::DIV;
 			if (targetIntegerType.numBits() < typeOnStack.numBytes() * 8)
 				convertType(IntegerType(typeOnStack.numBytes() * 8), _targetType, _cleanupNeeded);
 		}
@@ -329,12 +329,12 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 			if (targetType.numBytes() < typeOnStack.numBytes())
 			{
 				if (targetType.numBytes() == 0)
-					m_context << solidity::Instruction::DUP1 << solidity::Instruction::XOR;
+					m_context << Instruction::DUP1 << Instruction::XOR;
 				else
 				{
 					m_context << (u256(1) << (256 - targetType.numBytes() * 8));
-					m_context << solidity::Instruction::DUP1 << solidity::Instruction::SWAP2;
-					m_context << solidity::Instruction::DIV << solidity::Instruction::MUL;
+					m_context << Instruction::DUP1 << Instruction::SWAP2;
+					m_context << Instruction::DIV << Instruction::MUL;
 				}
 			}
 		}
@@ -356,7 +356,7 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 			if (auto typeOnStack = dynamic_cast<IntegerType const*>(&_typeOnStack))
 				if (targetBytesType.numBytes() * 8 > typeOnStack->numBits())
 					cleanHigherOrderBits(*typeOnStack);
-			m_context << (u256(1) << (256 - targetBytesType.numBytes() * 8)) << solidity::Instruction::MUL;
+			m_context << (u256(1) << (256 - targetBytesType.numBytes() * 8)) << Instruction::MUL;
 		}
 		else if (targetTypeCategory == Type::Category::Enum)
 			// just clean
@@ -406,7 +406,7 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 			m_context << storageSize;
 			allocateMemory();
 			// stack: mempos
-			m_context << solidity::Instruction::DUP1 << u256(data.size());
+			m_context << Instruction::DUP1 << u256(data.size());
 			storeInMemoryDynamic(IntegerType(256));
 			// stack: mempos datapos
 			storeStringData(data);
@@ -445,18 +445,18 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 
 				// allocate memory
 				// stack: <source ref> (variably sized) <length>
-				m_context << solidity::Instruction::DUP1;
+				m_context << Instruction::DUP1;
 				ArrayUtils(m_context).convertLengthToSize(targetType, true);
 				// stack: <source ref> (variably sized) <length> <size>
 				if (targetType.isDynamicallySized())
-					m_context << u256(0x20) << solidity::Instruction::ADD;
+					m_context << u256(0x20) << Instruction::ADD;
 				allocateMemory();
 				// stack: <source ref> (variably sized) <length> <mem start>
-				m_context << solidity::Instruction::DUP1;
+				m_context << Instruction::DUP1;
 				moveIntoStack(2 + stackSize);
 				if (targetType.isDynamicallySized())
 				{
-					m_context << solidity::Instruction::DUP2;
+					m_context << Instruction::DUP2;
 					storeInMemoryDynamic(IntegerType(256));
 				}
 				// stack: <mem start> <source ref> (variably sized) <length> <mem data pos>
@@ -468,12 +468,12 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 				}
 				else
 				{
-					m_context << u256(0) << solidity::Instruction::SWAP1;
+					m_context << u256(0) << Instruction::SWAP1;
 					// stack: <mem start> <source ref> (variably sized) <length> <counter> <mem data pos>
 					auto repeat = m_context.newTag();
 					m_context << repeat;
-					m_context << solidity::Instruction::DUP3 << solidity::Instruction::DUP3;
-					m_context << solidity::Instruction::LT << solidity::Instruction::ISZERO;
+					m_context << Instruction::DUP3 << Instruction::DUP3;
+					m_context << Instruction::LT << Instruction::ISZERO;
 					auto loopEnd = m_context.appendConditionalJump();
 					copyToStackTop(3 + stackSize, stackSize);
 					copyToStackTop(2 + stackSize, 1);
@@ -482,11 +482,11 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 						StorageItem(m_context, *typeOnStack.baseType()).retrieveValue(SourceLocation(), true);
 					convertType(*typeOnStack.baseType(), *targetType.baseType(), _cleanupNeeded);
 					storeInMemoryDynamic(*targetType.baseType(), true);
-					m_context << solidity::Instruction::SWAP1 << u256(1) << solidity::Instruction::ADD;
-					m_context << solidity::Instruction::SWAP1;
+					m_context << Instruction::SWAP1 << u256(1) << Instruction::ADD;
+					m_context << Instruction::SWAP1;
 					m_context.appendJumpTo(repeat);
 					m_context << loopEnd;
-					m_context << solidity::Instruction::POP;
+					m_context << Instruction::POP;
 				}
 				// stack: <mem start> <source ref> (variably sized) <length> <mem data pos updated>
 				popStackSlots(2 + stackSize);
@@ -540,14 +540,14 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 				// stack: <source ref>
 				m_context << typeOnStack.memorySize();
 				allocateMemory();
-				m_context << solidity::Instruction::SWAP1 << solidity::Instruction::DUP2;
+				m_context << Instruction::SWAP1 << Instruction::DUP2;
 				// stack: <memory ptr> <source ref> <memory ptr>
 				for (auto const& member: typeOnStack.members(nullptr))
 				{
 					if (!member.type->canLiveOutsideStorage())
 						continue;
 					pair<u256, unsigned> const& offsets = typeOnStack.storageOffsetsOfMember(member.name);
-					m_context << offsets.first << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
+					m_context << offsets.first << Instruction::DUP3 << Instruction::ADD;
 					m_context << u256(offsets.second);
 					StorageItem(m_context, *member.type).retrieveValue(SourceLocation(), true);
 					TypePointer targetMemberType = targetType.memberType(member.name);
@@ -555,7 +555,7 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 					convertType(*member.type, *targetMemberType, true);
 					storeInMemoryDynamic(*targetMemberType, true);
 				}
-				m_context << solidity::Instruction::POP << solidity::Instruction::POP;
+				m_context << Instruction::POP << Instruction::POP;
 			}
 			break;
 		case DataLocation::CallData:
@@ -602,13 +602,13 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 					// Move it back into its place.
 					for (unsigned j = 0; j < min(sourceSize, targetSize); ++j)
 						m_context <<
-							solidity::swapInstruction(depth + targetSize - sourceSize) <<
-							solidity::Instruction::POP;
+							swapInstruction(depth + targetSize - sourceSize) <<
+							Instruction::POP;
 					// Value shrank
 					for (unsigned j = targetSize; j < sourceSize; ++j)
 					{
 						moveToStackTop(depth - 1, 1);
-						m_context << solidity::Instruction::POP;
+						m_context << Instruction::POP;
 					}
 					// Value grew
 					if (targetSize > sourceSize)
@@ -639,7 +639,7 @@ void CompilerUtils::pushZeroValue(Type const& _type)
 
 	m_context << u256(max(32u, _type.calldataEncodedSize()));
 	allocateMemory();
-	m_context << solidity::Instruction::DUP1;
+	m_context << Instruction::DUP1;
 
 	if (auto structType = dynamic_cast<StructType const*>(&_type))
 		for (auto const& member: structType->members(nullptr))
@@ -657,7 +657,7 @@ void CompilerUtils::pushZeroValue(Type const& _type)
 		}
 		else if (arrayType->length() > 0)
 		{
-			m_context << arrayType->length() << solidity::Instruction::SWAP1;
+			m_context << arrayType->length() << Instruction::SWAP1;
 			// stack: items_to_do memory_pos
 			zeroInitialiseMemoryArray(*arrayType);
 			// stack: updated_memory_pos
@@ -667,7 +667,7 @@ void CompilerUtils::pushZeroValue(Type const& _type)
 		solAssert(false, "Requested initialisation for unknown type: " + _type.toString());
 
 	// remove the updated memory pointer
-	m_context << solidity::Instruction::POP;
+	m_context << Instruction::POP;
 }
 
 void CompilerUtils::moveToStackVariable(VariableDeclaration const& _variable)
@@ -683,14 +683,14 @@ void CompilerUtils::moveToStackVariable(VariableDeclaration const& _variable)
 			errinfo_comment("Stack too deep, try removing local variables.")
 		);
 	for (unsigned i = 0; i < size; ++i)
-		m_context << solidity::swapInstruction(stackPosition - size + 1) << solidity::Instruction::POP;
+		m_context << swapInstruction(stackPosition - size + 1) << Instruction::POP;
 }
 
 void CompilerUtils::copyToStackTop(unsigned _stackDepth, unsigned _itemSize)
 {
 	solAssert(_stackDepth <= 16, "Stack too deep, try removing local variables.");
 	for (unsigned i = 0; i < _itemSize; ++i)
-		m_context << solidity::dupInstruction(_stackDepth);
+		m_context << dupInstruction(_stackDepth);
 }
 
 void CompilerUtils::moveToStackTop(unsigned _stackDepth, unsigned _itemSize)
@@ -712,14 +712,14 @@ void CompilerUtils::rotateStackUp(unsigned _items)
 {
 	solAssert(_items - 1 <= 16, "Stack too deep, try removing local variables.");
 	for (unsigned i = 1; i < _items; ++i)
-		m_context << solidity::swapInstruction(_items - i);
+		m_context << swapInstruction(_items - i);
 }
 
 void CompilerUtils::rotateStackDown(unsigned _items)
 {
 	solAssert(_items - 1 <= 16, "Stack too deep, try removing local variables.");
 	for (unsigned i = 1; i < _items; ++i)
-		m_context << solidity::swapInstruction(i);
+		m_context << swapInstruction(i);
 }
 
 void CompilerUtils::popStackElement(Type const& _type)
@@ -730,7 +730,7 @@ void CompilerUtils::popStackElement(Type const& _type)
 void CompilerUtils::popStackSlots(size_t _amount)
 {
 	for (size_t i = 0; i < _amount; ++i)
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 }
 
 unsigned CompilerUtils::sizeOnStack(vector<shared_ptr<Type const>> const& _variableTypes)
@@ -744,7 +744,7 @@ unsigned CompilerUtils::sizeOnStack(vector<shared_ptr<Type const>> const& _varia
 void CompilerUtils::computeHashStatic()
 {
 	storeInMemory(0);
-	m_context << u256(32) << u256(0) << solidity::Instruction::SHA3;
+	m_context << u256(32) << u256(0) << Instruction::SHA3;
 }
 
 void CompilerUtils::storeStringData(bytesConstRef _data)
@@ -758,14 +758,14 @@ void CompilerUtils::storeStringData(bytesConstRef _data)
 			m_context << h256::Arith(h256(_data.cropped(i), h256::AlignLeft));
 			storeInMemoryDynamic(IntegerType(256));
 		}
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	}
 	else
 	{
 		// stack: mempos mempos_data
 		m_context.appendData(_data.toBytes());
-		m_context << u256(_data.size()) << solidity::Instruction::SWAP2;
-		m_context << solidity::Instruction::CODECOPY;
+		m_context << u256(_data.size()) << Instruction::SWAP2;
+		m_context << Instruction::CODECOPY;
 	}
 }
 
@@ -774,18 +774,18 @@ unsigned CompilerUtils::loadFromMemoryHelper(Type const& _type, bool _fromCallda
 	unsigned numBytes = _type.calldataEncodedSize(_padToWordBoundaries);
 	bool leftAligned = _type.category() == Type::Category::FixedBytes;
 	if (numBytes == 0)
-		m_context << solidity::Instruction::POP << u256(0);
+		m_context << Instruction::POP << u256(0);
 	else
 	{
 		solAssert(numBytes <= 32, "Static memory load of more than 32 bytes requested.");
-		m_context << (_fromCalldata ? solidity::Instruction::CALLDATALOAD : solidity::Instruction::MLOAD);
+		m_context << (_fromCalldata ? Instruction::CALLDATALOAD : Instruction::MLOAD);
 		if (numBytes != 32)
 		{
 			// add leading or trailing zeros by dividing/multiplying depending on alignment
 			u256 shiftFactor = u256(1) << ((32 - numBytes) * 8);
-			m_context << shiftFactor << solidity::Instruction::SWAP1 << solidity::Instruction::DIV;
+			m_context << shiftFactor << Instruction::SWAP1 << Instruction::DIV;
 			if (leftAligned)
-				m_context << shiftFactor << solidity::Instruction::MUL;
+				m_context << shiftFactor << Instruction::MUL;
 		}
 	}
 
@@ -797,9 +797,9 @@ void CompilerUtils::cleanHigherOrderBits(IntegerType const& _typeOnStack)
 	if (_typeOnStack.numBits() == 256)
 		return;
 	else if (_typeOnStack.isSigned())
-		m_context << u256(_typeOnStack.numBits() / 8 - 1) << solidity::Instruction::SIGNEXTEND;
+		m_context << u256(_typeOnStack.numBits() / 8 - 1) << Instruction::SIGNEXTEND;
 	else
-		m_context << ((u256(1) << _typeOnStack.numBits()) - 1) << solidity::Instruction::AND;
+		m_context << ((u256(1) << _typeOnStack.numBits()) - 1) << Instruction::AND;
 }
 
 unsigned CompilerUtils::prepareMemoryStore(Type const& _type, bool _padToWordBoundaries) const
@@ -807,13 +807,13 @@ unsigned CompilerUtils::prepareMemoryStore(Type const& _type, bool _padToWordBou
 	unsigned numBytes = _type.calldataEncodedSize(_padToWordBoundaries);
 	bool leftAligned = _type.category() == Type::Category::FixedBytes;
 	if (numBytes == 0)
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	else
 	{
 		solAssert(numBytes <= 32, "Memory store of more than 32 bytes requested.");
 		if (numBytes != 32 && !leftAligned && !_padToWordBoundaries)
 			// shift the value accordingly before storing
-			m_context << (u256(1) << ((32 - numBytes) * 8)) << solidity::Instruction::MUL;
+			m_context << (u256(1) << ((32 - numBytes) * 8)) << Instruction::MUL;
 	}
 	return numBytes;
 }
diff --git a/libsolidity/codegen/ExpressionCompiler.cpp b/libsolidity/codegen/ExpressionCompiler.cpp
index 4414cee7..ed36fb24 100644
--- a/libsolidity/codegen/ExpressionCompiler.cpp
+++ b/libsolidity/codegen/ExpressionCompiler.cpp
@@ -75,7 +75,7 @@ void ExpressionCompiler::appendConstStateVariableAccessor(VariableDeclaration co
 	utils().convertType(*_varDecl.value()->annotation().type, *_varDecl.annotation().type);
 
 	// append return
-	m_context << solidity::dupInstruction(_varDecl.annotation().type->sizeOnStack() + 1);
+	m_context << dupInstruction(_varDecl.annotation().type->sizeOnStack() + 1);
 	m_context.appendJump(eth::AssemblyItem::JumpType::OutOfFunction);
 }
 
@@ -103,13 +103,13 @@ void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const&
 				"Accessors for mapping with dynamically-sized keys not yet implemented."
 			);
 			// pop offset
-			m_context << solidity::Instruction::POP;
+			m_context << Instruction::POP;
 			// move storage offset to memory.
 			utils().storeInMemory(32);
 			// move key to memory.
 			utils().copyToStackTop(paramTypes.size() - i, 1);
 			utils().storeInMemory(0);
-			m_context << u256(64) << u256(0) << solidity::Instruction::SHA3;
+			m_context << u256(64) << u256(0) << Instruction::SHA3;
 			// push offset
 			m_context << u256(0);
 			returnType = mappingType->valueType();
@@ -117,7 +117,7 @@ void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const&
 		else if (auto arrayType = dynamic_cast<ArrayType const*>(returnType.get()))
 		{
 			// pop offset
-			m_context << solidity::Instruction::POP;
+			m_context << Instruction::POP;
 			utils().copyToStackTop(paramTypes.size() - i + 1, 1);
 			ArrayUtils(m_context).accessIndex(*arrayType);
 			returnType = arrayType->baseType();
@@ -127,12 +127,12 @@ void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const&
 	}
 	// remove index arguments.
 	if (paramTypes.size() == 1)
-		m_context << solidity::Instruction::SWAP2 << solidity::Instruction::POP << solidity::Instruction::SWAP1;
+		m_context << Instruction::SWAP2 << Instruction::POP << Instruction::SWAP1;
 	else if (paramTypes.size() >= 2)
 	{
-		m_context << solidity::swapInstruction(paramTypes.size());
-		m_context << solidity::Instruction::POP;
-		m_context << solidity::swapInstruction(paramTypes.size());
+		m_context << swapInstruction(paramTypes.size());
+		m_context << Instruction::POP;
+		m_context << swapInstruction(paramTypes.size());
 		utils().popStackSlots(paramTypes.size() - 1);
 	}
 	unsigned retSizeOnStack = 0;
@@ -141,7 +141,7 @@ void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const&
 	if (StructType const* structType = dynamic_cast<StructType const*>(returnType.get()))
 	{
 		// remove offset
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 		auto const& names = accessorType.returnParameterNames();
 		// struct
 		for (size_t i = 0; i < names.size(); ++i)
@@ -152,7 +152,7 @@ void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const&
 				if (!arrayType->isByteArray())
 					continue;
 			pair<u256, unsigned> const& offsets = structType->storageOffsetsOfMember(names[i]);
-			m_context << solidity::Instruction::DUP1 << u256(offsets.first) << solidity::Instruction::ADD << u256(offsets.second);
+			m_context << Instruction::DUP1 << u256(offsets.first) << Instruction::ADD << u256(offsets.second);
 			TypePointer memberType = structType->memberType(names[i]);
 			StorageItem(m_context, *memberType).retrieveValue(SourceLocation(), true);
 			utils().convertType(*memberType, *returnTypes[i]);
@@ -160,7 +160,7 @@ void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const&
 			retSizeOnStack += returnTypes[i]->sizeOnStack();
 		}
 		// remove slot
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	}
 	else
 	{
@@ -172,7 +172,7 @@ void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const&
 	}
 	solAssert(retSizeOnStack == utils().sizeOnStack(returnTypes), "");
 	solAssert(retSizeOnStack <= 15, "Stack is too deep.");
-	m_context << solidity::dupInstruction(retSizeOnStack + 1);
+	m_context << dupInstruction(retSizeOnStack + 1);
 	m_context.appendJump(eth::AssemblyItem::JumpType::OutOfFunction);
 }
 
@@ -226,7 +226,7 @@ bool ExpressionCompiler::visit(Assignment const& _assignment)
 			solAssert(itemSize + lvalueSize <= 16, "Stack too deep, try removing local variables.");
 			// value [lvalue_ref] updated_value
 			for (unsigned i = 0; i < itemSize; ++i)
-				m_context << solidity::swapInstruction(itemSize + lvalueSize) << solidity::Instruction::POP;
+				m_context << swapInstruction(itemSize + lvalueSize) << Instruction::POP;
 		}
 	}
 	m_currentLValue->storeValue(*type, _assignment.location());
@@ -243,7 +243,7 @@ bool ExpressionCompiler::visit(TupleExpression const& _tuple)
 		solAssert(!arrayType.isDynamicallySized(), "Cannot create dynamically sized inline array.");
 		m_context << max(u256(32u), arrayType.memorySize());
 		utils().allocateMemory();
-		m_context << solidity::Instruction::DUP1;
+		m_context << Instruction::DUP1;
 	
 		for (auto const& component: _tuple.components())
 		{
@@ -252,7 +252,7 @@ bool ExpressionCompiler::visit(TupleExpression const& _tuple)
 			utils().storeInMemoryDynamic(*arrayType.baseType(), true);				
 		}
 		
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	}
 	else
 	{
@@ -298,13 +298,13 @@ bool ExpressionCompiler::visit(UnaryOperation const& _unaryOperation)
 	switch (_unaryOperation.getOperator())
 	{
 	case Token::Not: // !
-		m_context << solidity::Instruction::ISZERO;
+		m_context << Instruction::ISZERO;
 		break;
 	case Token::BitNot: // ~
-		m_context << solidity::Instruction::NOT;
+		m_context << Instruction::NOT;
 		break;
 	case Token::After: // after
-		m_context << solidity::Instruction::TIMESTAMP << solidity::Instruction::ADD;
+		m_context << Instruction::TIMESTAMP << Instruction::ADD;
 		break;
 	case Token::Delete: // delete
 		solAssert(!!m_currentLValue, "LValue not retrieved.");
@@ -319,20 +319,20 @@ bool ExpressionCompiler::visit(UnaryOperation const& _unaryOperation)
 		{
 			// store value for later
 			solAssert(_unaryOperation.annotation().type->sizeOnStack() == 1, "Stack size != 1 not implemented.");
-			m_context << solidity::Instruction::DUP1;
+			m_context << Instruction::DUP1;
 			if (m_currentLValue->sizeOnStack() > 0)
 				for (unsigned i = 1 + m_currentLValue->sizeOnStack(); i > 0; --i)
-					m_context << solidity::swapInstruction(i);
+					m_context << swapInstruction(i);
 		}
 		m_context << u256(1);
 		if (_unaryOperation.getOperator() == Token::Inc)
-			m_context << solidity::Instruction::ADD;
+			m_context << Instruction::ADD;
 		else
-			m_context << solidity::Instruction::SWAP1 << solidity::Instruction::SUB;
+			m_context << Instruction::SWAP1 << Instruction::SUB;
 		// Stack for prefix: [ref...] (*ref)+-1
 		// Stack for postfix: *ref [ref...] (*ref)+-1
 		for (unsigned i = m_currentLValue->sizeOnStack(); i > 0; --i)
-			m_context << solidity::swapInstruction(i);
+			m_context << swapInstruction(i);
 		m_currentLValue->storeValue(
 			*_unaryOperation.annotation().type, _unaryOperation.location(),
 			!_unaryOperation.isPrefixOperation());
@@ -342,7 +342,7 @@ bool ExpressionCompiler::visit(UnaryOperation const& _unaryOperation)
 		// unary add, so basically no-op
 		break;
 	case Token::Sub: // -
-		m_context << u256(0) << solidity::Instruction::SUB;
+		m_context << u256(0) << Instruction::SUB;
 		break;
 	default:
 		BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Invalid unary operator: " +
@@ -452,7 +452,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 
 		m_context << max(u256(32u), structType.memorySize());
 		utils().allocateMemory();
-		m_context << solidity::Instruction::DUP1;
+		m_context << Instruction::DUP1;
 
 		for (unsigned i = 0; i < arguments.size(); ++i)
 		{
@@ -460,7 +460,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 			utils().convertType(*arguments[i]->annotation().type, *functionType->parameterTypes()[i]);
 			utils().storeInMemoryDynamic(*functionType->parameterTypes()[i]);
 		}
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 	}
 	else
 	{
@@ -518,21 +518,21 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 			utils().fetchFreeMemoryPointer();
 			// pushes size
 			eth::AssemblyItem subroutine = m_context.addSubroutine(assembly);
-			m_context << solidity::Instruction::DUP1 << subroutine;
-			m_context << solidity::Instruction::DUP4 << solidity::Instruction::CODECOPY;
+			m_context << Instruction::DUP1 << subroutine;
+			m_context << Instruction::DUP4 << Instruction::CODECOPY;
 
-			m_context << solidity::Instruction::ADD;
+			m_context << Instruction::ADD;
 			utils().encodeToMemory(argumentTypes, function.parameterTypes());
 			// now on stack: memory_end_ptr
 			// need: size, offset, endowment
 			utils().toSizeAfterFreeMemoryPointer();
 			if (function.valueSet())
-				m_context << solidity::dupInstruction(3);
+				m_context << dupInstruction(3);
 			else
 				m_context << u256(0);
-			m_context << solidity::Instruction::CREATE;
+			m_context << Instruction::CREATE;
 			if (function.valueSet())
-				m_context << solidity::swapInstruction(1) << solidity::Instruction::POP;
+				m_context << swapInstruction(1) << Instruction::POP;
 			break;
 		}
 		case Location::SetGas:
@@ -546,9 +546,9 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 			// Its values of gasSet and valueSet is equal to the original function's though.
 			unsigned stackDepth = (function.gasSet() ? 1 : 0) + (function.valueSet() ? 1 : 0);
 			if (stackDepth > 0)
-				m_context << solidity::swapInstruction(stackDepth);
+				m_context << swapInstruction(stackDepth);
 			if (function.gasSet())
-				m_context << solidity::Instruction::POP;
+				m_context << Instruction::POP;
 			break;
 		}
 		case Location::SetValue:
@@ -557,7 +557,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 			// Note that function is not the original function, but the ".value" function.
 			// Its values of gasSet and valueSet is equal to the original function's though.
 			if (function.valueSet())
-				m_context << solidity::Instruction::POP;
+				m_context << Instruction::POP;
 			arguments.front()->accept(*this);
 			break;
 		case Location::Send:
@@ -586,7 +586,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 		case Location::Selfdestruct:
 			arguments.front()->accept(*this);
 			utils().convertType(*arguments.front()->annotation().type, *function.parameterTypes().front(), true);
-			m_context << solidity::Instruction::SUICIDE;
+			m_context << Instruction::SUICIDE;
 			break;
 		case Location::SHA3:
 		{
@@ -599,7 +599,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 			utils().fetchFreeMemoryPointer();
 			utils().encodeToMemory(argumentTypes, TypePointers(), function.padArguments(), true);
 			utils().toSizeAfterFreeMemoryPointer();
-			m_context << solidity::Instruction::SHA3;
+			m_context << Instruction::SHA3;
 			break;
 		}
 		case Location::Log0:
@@ -622,7 +622,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 				false,
 				true);
 			utils().toSizeAfterFreeMemoryPointer();
-			m_context << solidity::logInstruction(logNumber);
+			m_context << logInstruction(logNumber);
 			break;
 		}
 		case Location::Event:
@@ -646,7 +646,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 							true
 						);
 						utils().toSizeAfterFreeMemoryPointer();
-						m_context << solidity::Instruction::SHA3;
+						m_context << Instruction::SHA3;
 					}
 					else
 						utils().convertType(
@@ -676,14 +676,14 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 			utils().encodeToMemory(nonIndexedArgTypes, nonIndexedParamTypes);
 			// need: topic1 ... topicn memsize memstart
 			utils().toSizeAfterFreeMemoryPointer();
-			m_context << solidity::logInstruction(numIndexed);
+			m_context << logInstruction(numIndexed);
 			break;
 		}
 		case Location::BlockHash:
 		{
 			arguments[0]->accept(*this);
 			utils().convertType(*arguments[0]->annotation().type, *function.parameterTypes()[0], true);
-			m_context << solidity::Instruction::BLOCKHASH;
+			m_context << Instruction::BLOCKHASH;
 			break;
 		}
 		case Location::AddMod:
@@ -695,9 +695,9 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 				utils().convertType(*arguments[2 - i]->annotation().type, IntegerType(256));
 			}
 			if (function.location() == Location::AddMod)
-				m_context << solidity::Instruction::ADDMOD;
+				m_context << Instruction::ADDMOD;
 			else
-				m_context << solidity::Instruction::MULMOD;
+				m_context << Instruction::MULMOD;
 			break;
 		}
 		case Location::ECRecover:
@@ -710,7 +710,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 															   {Location::RIPEMD160, 3}};
 			m_context << contractAddresses.find(function.location())->second;
 			for (unsigned i = function.sizeOnStack(); i > 0; --i)
-				m_context << solidity::swapInstruction(i);
+				m_context << swapInstruction(i);
 			appendExternalFunctionCall(function, arguments);
 			break;
 		}
@@ -727,13 +727,13 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 				make_shared<ArrayType>(DataLocation::Storage);
 			// get the current length
 			ArrayUtils(m_context).retrieveLength(*arrayType);
-			m_context << solidity::Instruction::DUP1;
+			m_context << Instruction::DUP1;
 			// stack: ArrayReference currentLength currentLength
-			m_context << u256(1) << solidity::Instruction::ADD;
+			m_context << u256(1) << Instruction::ADD;
 			// stack: ArrayReference currentLength newLength
-			m_context << solidity::Instruction::DUP3 << solidity::Instruction::DUP2;
+			m_context << Instruction::DUP3 << Instruction::DUP2;
 			ArrayUtils(m_context).resizeDynamicArray(*arrayType);
-			m_context << solidity::Instruction::SWAP2 << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP2 << Instruction::SWAP1;
 			// stack: newLength ArrayReference oldLength
 			ArrayUtils(m_context).accessIndex(*arrayType, false);
 
@@ -766,36 +766,36 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 			// Stack: requested_length
 			// Allocate at max(MSIZE, freeMemoryPointer)
 			utils().fetchFreeMemoryPointer();
-			m_context << solidity::Instruction::DUP1 << solidity::Instruction::MSIZE;
-			m_context << solidity::Instruction::LT;
+			m_context << Instruction::DUP1 << Instruction::MSIZE;
+			m_context << Instruction::LT;
 			auto initialise = m_context.appendConditionalJump();
 			// Free memory pointer does not point to empty memory, use MSIZE.
-			m_context << solidity::Instruction::POP;
-			m_context << solidity::Instruction::MSIZE;
+			m_context << Instruction::POP;
+			m_context << Instruction::MSIZE;
 			m_context << initialise;
 
 			// Stack: requested_length memptr
-			m_context << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP1;
 			// Stack: memptr requested_length
 			// store length
-			m_context << solidity::Instruction::DUP1 << solidity::Instruction::DUP3 << solidity::Instruction::MSTORE;
+			m_context << Instruction::DUP1 << Instruction::DUP3 << Instruction::MSTORE;
 			// Stack: memptr requested_length
 			// update free memory pointer
-			m_context << solidity::Instruction::DUP1 << arrayType.baseType()->memoryHeadSize();
-			m_context << solidity::Instruction::MUL << u256(32) << solidity::Instruction::ADD;
-			m_context << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
+			m_context << Instruction::DUP1 << arrayType.baseType()->memoryHeadSize();
+			m_context << Instruction::MUL << u256(32) << Instruction::ADD;
+			m_context << Instruction::DUP3 << Instruction::ADD;
 			utils().storeFreeMemoryPointer();
 			// Stack: memptr requested_length
 
 			// We only have to initialise if the base type is a not a value type.
 			if (dynamic_cast<ReferenceType const*>(arrayType.baseType().get()))
 			{
-				m_context << solidity::Instruction::DUP2 << u256(32) << solidity::Instruction::ADD;
+				m_context << Instruction::DUP2 << u256(32) << Instruction::ADD;
 				utils().zeroInitialiseMemoryArray(arrayType);
-				m_context << solidity::Instruction::POP;
+				m_context << Instruction::POP;
 			}
 			else
-				m_context << solidity::Instruction::POP;
+				m_context << Instruction::POP;
 			break;
 		}
 		default:
@@ -876,7 +876,7 @@ void ExpressionCompiler::endVisit(MemberAccess const& _memberAccess)
 				IntegerType(0, IntegerType::Modifier::Address),
 				true
 			);
-			m_context << solidity::Instruction::BALANCE;
+			m_context << Instruction::BALANCE;
 		}
 		else if ((set<string>{"send", "call", "callcode", "delegatecall"}).count(member))
 			utils().convertType(
@@ -894,30 +894,30 @@ void ExpressionCompiler::endVisit(MemberAccess const& _memberAccess)
 	case Type::Category::Magic:
 		// we can ignore the kind of magic and only look at the name of the member
 		if (member == "coinbase")
-			m_context << solidity::Instruction::COINBASE;
+			m_context << Instruction::COINBASE;
 		else if (member == "timestamp")
-			m_context << solidity::Instruction::TIMESTAMP;
+			m_context << Instruction::TIMESTAMP;
 		else if (member == "difficulty")
-			m_context << solidity::Instruction::DIFFICULTY;
+			m_context << Instruction::DIFFICULTY;
 		else if (member == "number")
-			m_context << solidity::Instruction::NUMBER;
+			m_context << Instruction::NUMBER;
 		else if (member == "gaslimit")
-			m_context << solidity::Instruction::GASLIMIT;
+			m_context << Instruction::GASLIMIT;
 		else if (member == "sender")
-			m_context << solidity::Instruction::CALLER;
+			m_context << Instruction::CALLER;
 		else if (member == "value")
-			m_context << solidity::Instruction::CALLVALUE;
+			m_context << Instruction::CALLVALUE;
 		else if (member == "origin")
-			m_context << solidity::Instruction::ORIGIN;
+			m_context << Instruction::ORIGIN;
 		else if (member == "gas")
-			m_context << solidity::Instruction::GAS;
+			m_context << Instruction::GAS;
 		else if (member == "gasprice")
-			m_context << solidity::Instruction::GASPRICE;
+			m_context << Instruction::GASPRICE;
 		else if (member == "data")
-			m_context << u256(0) << solidity::Instruction::CALLDATASIZE;
+			m_context << u256(0) << Instruction::CALLDATASIZE;
 		else if (member == "sig")
-			m_context << u256(0) << solidity::Instruction::CALLDATALOAD
-				<< (u256(0xffffffff) << (256 - 32)) << solidity::Instruction::AND;
+			m_context << u256(0) << Instruction::CALLDATALOAD
+				<< (u256(0xffffffff) << (256 - 32)) << Instruction::AND;
 		else
 			BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown magic member."));
 		break;
@@ -929,13 +929,13 @@ void ExpressionCompiler::endVisit(MemberAccess const& _memberAccess)
 		case DataLocation::Storage:
 		{
 			pair<u256, unsigned> const& offsets = type.storageOffsetsOfMember(member);
-			m_context << offsets.first << solidity::Instruction::ADD << u256(offsets.second);
+			m_context << offsets.first << Instruction::ADD << u256(offsets.second);
 			setLValueToStorageItem(_memberAccess);
 			break;
 		}
 		case DataLocation::Memory:
 		{
-			m_context << type.memoryOffsetOfMember(member) << solidity::Instruction::ADD;
+			m_context << type.memoryOffsetOfMember(member) << Instruction::ADD;
 			setLValue<MemoryItem>(_memberAccess, *_memberAccess.annotation().type);
 			break;
 		}
@@ -986,13 +986,13 @@ void ExpressionCompiler::endVisit(MemberAccess const& _memberAccess)
 				switch (type.location())
 				{
 				case DataLocation::CallData:
-					m_context << solidity::Instruction::SWAP1 << solidity::Instruction::POP;
+					m_context << Instruction::SWAP1 << Instruction::POP;
 					break;
 				case DataLocation::Storage:
 					setLValue<StorageArrayLength>(_memberAccess, type);
 					break;
 				case DataLocation::Memory:
-					m_context << solidity::Instruction::MLOAD;
+					m_context << Instruction::MLOAD;
 					break;
 				}
 		}
@@ -1046,7 +1046,7 @@ bool ExpressionCompiler::visit(IndexAccess const& _indexAccess)
 				false,
 				true
 			);
-			m_context << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP1;
 			utils().storeInMemoryDynamic(IntegerType(256));
 			utils().toSizeAfterFreeMemoryPointer();
 		}
@@ -1054,12 +1054,12 @@ bool ExpressionCompiler::visit(IndexAccess const& _indexAccess)
 		{
 			m_context << u256(0); // memory position
 			appendExpressionCopyToMemory(*keyType, *_indexAccess.indexExpression());
-			m_context << solidity::Instruction::SWAP1;
+			m_context << Instruction::SWAP1;
 			solAssert(CompilerUtils::freeMemoryPointer >= 0x40, "");
 			utils().storeInMemoryDynamic(IntegerType(256));
 			m_context << u256(0);
 		}
-		m_context << solidity::Instruction::SHA3;
+		m_context << Instruction::SHA3;
 		m_context << u256(0);
 		setLValueToStorageItem(_indexAccess);
 	}
@@ -1109,12 +1109,12 @@ bool ExpressionCompiler::visit(IndexAccess const& _indexAccess)
 		// stack layout: <value> <index>
 		// check out-of-bounds access
 		m_context << u256(fixedBytesType.numBytes());
-		m_context << solidity::Instruction::DUP2 << solidity::Instruction::LT << solidity::Instruction::ISZERO;
+		m_context << Instruction::DUP2 << Instruction::LT << Instruction::ISZERO;
 		// out-of-bounds access throws exception
 		m_context.appendConditionalJumpTo(m_context.errorTag());
 
-		m_context << solidity::Instruction::BYTE;
-		m_context << (u256(1) << (256 - 8)) << solidity::Instruction::MUL;
+		m_context << Instruction::BYTE;
+		m_context << (u256(1) << (256 - 8)) << Instruction::MUL;
 	}
 	else if (baseType.category() == Type::Category::TypeType)
 	{
@@ -1139,11 +1139,11 @@ void ExpressionCompiler::endVisit(Identifier const& _identifier)
 		case Type::Category::Contract:
 			// "this" or "super"
 			if (!dynamic_cast<ContractType const&>(*magicVar->type()).isSuper())
-				m_context << solidity::Instruction::ADDRESS;
+				m_context << Instruction::ADDRESS;
 			break;
 		case Type::Category::Integer:
 			// "now"
-			m_context << solidity::Instruction::TIMESTAMP;
+			m_context << Instruction::TIMESTAMP;
 			break;
 		default:
 			break;
@@ -1208,11 +1208,11 @@ void ExpressionCompiler::appendAndOrOperatorCode(BinaryOperation const& _binaryO
 	solAssert(c_op == Token::Or || c_op == Token::And, "");
 
 	_binaryOperation.leftExpression().accept(*this);
-	m_context << solidity::Instruction::DUP1;
+	m_context << Instruction::DUP1;
 	if (c_op == Token::And)
-		m_context << solidity::Instruction::ISZERO;
+		m_context << Instruction::ISZERO;
 	eth::AssemblyItem endLabel = m_context.appendConditionalJump();
-	m_context << solidity::Instruction::POP;
+	m_context << Instruction::POP;
 	_binaryOperation.rightExpression().accept(*this);
 	m_context << endLabel;
 }
@@ -1221,9 +1221,9 @@ void ExpressionCompiler::appendCompareOperatorCode(Token::Value _operator, Type
 {
 	if (_operator == Token::Equal || _operator == Token::NotEqual)
 	{
-		m_context << solidity::Instruction::EQ;
+		m_context << Instruction::EQ;
 		if (_operator == Token::NotEqual)
-			m_context << solidity::Instruction::ISZERO;
+			m_context << Instruction::ISZERO;
 	}
 	else
 	{
@@ -1235,19 +1235,19 @@ void ExpressionCompiler::appendCompareOperatorCode(Token::Value _operator, Type
 		{
 		case Token::GreaterThanOrEqual:
 			m_context <<
-				(isSigned ? solidity::Instruction::SLT : solidity::Instruction::LT) <<
-				solidity::Instruction::ISZERO;
+				(isSigned ? Instruction::SLT : Instruction::LT) <<
+				Instruction::ISZERO;
 			break;
 		case Token::LessThanOrEqual:
 			m_context <<
-				(isSigned ? solidity::Instruction::SGT : solidity::Instruction::GT) <<
-				solidity::Instruction::ISZERO;
+				(isSigned ? Instruction::SGT : Instruction::GT) <<
+				Instruction::ISZERO;
 			break;
 		case Token::GreaterThan:
-			m_context << (isSigned ? solidity::Instruction::SGT : solidity::Instruction::GT);
+			m_context << (isSigned ? Instruction::SGT : Instruction::GT);
 			break;
 		case Token::LessThan:
-			m_context << (isSigned ? solidity::Instruction::SLT : solidity::Instruction::LT);
+			m_context << (isSigned ? Instruction::SLT : Instruction::LT);
 			break;
 		default:
 			BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown comparison operator."));
@@ -1275,22 +1275,22 @@ void ExpressionCompiler::appendArithmeticOperatorCode(Token::Value _operator, Ty
 	switch (_operator)
 	{
 	case Token::Add:
-		m_context << solidity::Instruction::ADD;
+		m_context << Instruction::ADD;
 		break;
 	case Token::Sub:
-		m_context << solidity::Instruction::SUB;
+		m_context << Instruction::SUB;
 		break;
 	case Token::Mul:
-		m_context << solidity::Instruction::MUL;
+		m_context << Instruction::MUL;
 		break;
 	case Token::Div:
-		m_context  << (c_isSigned ? solidity::Instruction::SDIV : solidity::Instruction::DIV);
+		m_context  << (c_isSigned ? Instruction::SDIV : Instruction::DIV);
 		break;
 	case Token::Mod:
-		m_context << (c_isSigned ? solidity::Instruction::SMOD : solidity::Instruction::MOD);
+		m_context << (c_isSigned ? Instruction::SMOD : Instruction::MOD);
 		break;
 	case Token::Exp:
-		m_context << solidity::Instruction::EXP;
+		m_context << Instruction::EXP;
 		break;
 	default:
 		BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown arithmetic operator."));
@@ -1302,13 +1302,13 @@ void ExpressionCompiler::appendBitOperatorCode(Token::Value _operator)
 	switch (_operator)
 	{
 	case Token::BitOr:
-		m_context << solidity::Instruction::OR;
+		m_context << Instruction::OR;
 		break;
 	case Token::BitAnd:
-		m_context << solidity::Instruction::AND;
+		m_context << Instruction::AND;
 		break;
 	case Token::BitXor:
-		m_context << solidity::Instruction::XOR;
+		m_context << Instruction::XOR;
 		break;
 	default:
 		BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown bit operator."));
@@ -1392,7 +1392,7 @@ void ExpressionCompiler::appendExternalFunctionCall(
 			true
 		);
 		for (unsigned i = 0; i < gasValueSize; ++i)
-			m_context << solidity::swapInstruction(gasValueSize - i);
+			m_context << swapInstruction(gasValueSize - i);
 		gasStackPos++;
 		valueStackPos++;
 	}
@@ -1411,7 +1411,7 @@ void ExpressionCompiler::appendExternalFunctionCall(
 	utils().fetchFreeMemoryPointer();
 	if (!_functionType.isBareCall() || manualFunctionId)
 	{
-		m_context << solidity::dupInstruction(2 + gasValueSize + CompilerUtils::sizeOnStack(argumentTypes));
+		m_context << dupInstruction(2 + gasValueSize + CompilerUtils::sizeOnStack(argumentTypes));
 		utils().storeInMemoryDynamic(IntegerType(8 * CompilerUtils::dataStartOffset), false);
 	}
 	// If the function takes arbitrary parameters, copy dynamic length data in place.
@@ -1437,21 +1437,21 @@ void ExpressionCompiler::appendExternalFunctionCall(
 	// put on stack: <size of output> <memory pos of output> <size of input> <memory pos of input>
 	m_context << u256(retSize);
 	utils().fetchFreeMemoryPointer();
-	m_context << solidity::Instruction::DUP1 << solidity::Instruction::DUP4 << solidity::Instruction::SUB;
-	m_context << solidity::Instruction::DUP2;
+	m_context << Instruction::DUP1 << Instruction::DUP4 << Instruction::SUB;
+	m_context << Instruction::DUP2;
 
 	// CALL arguments: outSize, outOff, inSize, inOff (already present up to here)
 	// [value,] addr, gas (stack top)
 	if (isDelegateCall)
 		solAssert(!_functionType.valueSet(), "Value set for delegatecall");
 	else if (_functionType.valueSet())
-		m_context << solidity::dupInstruction(m_context.baseToCurrentStackOffset(valueStackPos));
+		m_context << dupInstruction(m_context.baseToCurrentStackOffset(valueStackPos));
 	else
 		m_context << u256(0);
-	m_context << solidity::dupInstruction(m_context.baseToCurrentStackOffset(contractStackPos));
+	m_context << dupInstruction(m_context.baseToCurrentStackOffset(contractStackPos));
 
 	if (_functionType.gasSet())
-		m_context << solidity::dupInstruction(m_context.baseToCurrentStackOffset(gasStackPos));
+		m_context << dupInstruction(m_context.baseToCurrentStackOffset(gasStackPos));
 	else
 	{
 		eth::EVMSchedule schedule;
@@ -1464,15 +1464,15 @@ void ExpressionCompiler::appendExternalFunctionCall(
 			gasNeededByCaller += schedule.callNewAccountGas; // we never know
 		m_context <<
 			gasNeededByCaller <<
-			solidity::Instruction::GAS <<
-			solidity::Instruction::SUB;
+			Instruction::GAS <<
+			Instruction::SUB;
 	}
 	if (isDelegateCall)
-		m_context << solidity::Instruction::DELEGATECALL;
+		m_context << Instruction::DELEGATECALL;
 	else if (isCallCode)
-		m_context << solidity::Instruction::CALLCODE;
+		m_context << Instruction::CALLCODE;
 	else
-		m_context << solidity::Instruction::CALL;
+		m_context << Instruction::CALL;
 
 	unsigned remainsSize =
 		2 + // contract address, input_memory_end
@@ -1481,11 +1481,11 @@ void ExpressionCompiler::appendExternalFunctionCall(
 		(!_functionType.isBareCall() || manualFunctionId);
 
 	if (returnSuccessCondition)
-		m_context << solidity::swapInstruction(remainsSize);
+		m_context << swapInstruction(remainsSize);
 	else
 	{
 		//Propagate error condition (if CALL pushes 0 on stack).
-		m_context << solidity::Instruction::ISZERO;
+		m_context << Instruction::ISZERO;
 		m_context.appendConditionalJumpTo(m_context.errorTag());
 	}
 
@@ -1515,7 +1515,7 @@ void ExpressionCompiler::appendExternalFunctionCall(
 		if (memoryNeeded)
 			utils().storeFreeMemoryPointer();
 		else
-			m_context << solidity::Instruction::POP;
+			m_context << Instruction::POP;
 	}
 }
 
diff --git a/libsolidity/codegen/LValue.cpp b/libsolidity/codegen/LValue.cpp
index 66d4aa32..fcadd2ff 100644
--- a/libsolidity/codegen/LValue.cpp
+++ b/libsolidity/codegen/LValue.cpp
@@ -49,7 +49,7 @@ void StackVariable::retrieveValue(SourceLocation const& _location, bool) const
 		);
 	solAssert(stackPos + 1 >= m_size, "Size and stack pos mismatch.");
 	for (unsigned i = 0; i < m_size; ++i)
-		m_context << solidity::dupInstruction(stackPos + 1);
+		m_context << dupInstruction(stackPos + 1);
 }
 
 void StackVariable::storeValue(Type const&, SourceLocation const& _location, bool _move) const
@@ -63,7 +63,7 @@ void StackVariable::storeValue(Type const&, SourceLocation const& _location, boo
 		);
 	else if (stackDiff > 0)
 		for (unsigned i = 0; i < m_size; ++i)
-			m_context << solidity::swapInstruction(stackDiff) << solidity::Instruction::POP;
+			m_context << swapInstruction(stackDiff) << Instruction::POP;
 	if (!_move)
 		retrieveValue(_location);
 }
@@ -85,11 +85,11 @@ void MemoryItem::retrieveValue(SourceLocation const&, bool _remove) const
 	if (m_dataType->isValueType())
 	{
 		if (!_remove)
-			m_context << solidity::Instruction::DUP1;
+			m_context << Instruction::DUP1;
 		CompilerUtils(m_context).loadFromMemoryDynamic(*m_dataType, false, m_padded, false);
 	}
 	else
-		m_context << solidity::Instruction::MLOAD;
+		m_context << Instruction::MLOAD;
 }
 
 void MemoryItem::storeValue(Type const& _sourceType, SourceLocation const&, bool _move) const
@@ -109,13 +109,13 @@ void MemoryItem::storeValue(Type const& _sourceType, SourceLocation const&, bool
 		{
 			solAssert(m_dataType->calldataEncodedSize(false) == 1, "Invalid non-padded type.");
 			if (m_dataType->category() == Type::Category::FixedBytes)
-				m_context << u256(0) << solidity::Instruction::BYTE;
-			m_context << solidity::Instruction::SWAP1 << solidity::Instruction::MSTORE8;
+				m_context << u256(0) << Instruction::BYTE;
+			m_context << Instruction::SWAP1 << Instruction::MSTORE8;
 		}
 		else
 		{
 			utils.storeInMemoryDynamic(*m_dataType, m_padded);
-			m_context << solidity::Instruction::POP;
+			m_context << Instruction::POP;
 		}
 	}
 	else
@@ -124,10 +124,10 @@ void MemoryItem::storeValue(Type const& _sourceType, SourceLocation const&, bool
 
 		solAssert(m_dataType->sizeOnStack() == 1, "");
 		if (!_move)
-			m_context << solidity::Instruction::DUP2 << solidity::Instruction::SWAP1;
+			m_context << Instruction::DUP2 << Instruction::SWAP1;
 		// stack: [value] value lvalue
 		// only store the reference
-		m_context << solidity::Instruction::MSTORE;
+		m_context << Instruction::MSTORE;
 	}
 }
 
@@ -135,10 +135,10 @@ void MemoryItem::setToZero(SourceLocation const&, bool _removeReference) const
 {
 	CompilerUtils utils(m_context);
 	if (!_removeReference)
-		m_context << solidity::Instruction::DUP1;
+		m_context << Instruction::DUP1;
 	utils.pushZeroValue(*m_dataType);
 	utils.storeInMemoryDynamic(*m_dataType, m_padded);
-	m_context << solidity::Instruction::POP;
+	m_context << Instruction::POP;
 }
 
 StorageItem::StorageItem(CompilerContext& _compilerContext, VariableDeclaration const& _declaration):
@@ -165,29 +165,29 @@ void StorageItem::retrieveValue(SourceLocation const&, bool _remove) const
 	{
 		solAssert(m_dataType->sizeOnStack() == 1, "Invalid storage ref size.");
 		if (_remove)
-			m_context << solidity::Instruction::POP; // remove byte offset
+			m_context << Instruction::POP; // remove byte offset
 		else
-			m_context << solidity::Instruction::DUP2;
+			m_context << Instruction::DUP2;
 		return;
 	}
 	if (!_remove)
 		CompilerUtils(m_context).copyToStackTop(sizeOnStack(), sizeOnStack());
 	if (m_dataType->storageBytes() == 32)
-		m_context << solidity::Instruction::POP << solidity::Instruction::SLOAD;
+		m_context << Instruction::POP << Instruction::SLOAD;
 	else
 	{
 		m_context
-			<< solidity::Instruction::SWAP1 << solidity::Instruction::SLOAD << solidity::Instruction::SWAP1
-			<< u256(0x100) << solidity::Instruction::EXP << solidity::Instruction::SWAP1 << solidity::Instruction::DIV;
+			<< Instruction::SWAP1 << Instruction::SLOAD << Instruction::SWAP1
+			<< u256(0x100) << Instruction::EXP << Instruction::SWAP1 << Instruction::DIV;
 		if (m_dataType->category() == Type::Category::FixedBytes)
-			m_context << (u256(0x1) << (256 - 8 * m_dataType->storageBytes())) << solidity::Instruction::MUL;
+			m_context << (u256(0x1) << (256 - 8 * m_dataType->storageBytes())) << Instruction::MUL;
 		else if (
 			m_dataType->category() == Type::Category::Integer &&
 			dynamic_cast<IntegerType const&>(*m_dataType).isSigned()
 		)
-			m_context << u256(m_dataType->storageBytes() - 1) << solidity::Instruction::SIGNEXTEND;
+			m_context << u256(m_dataType->storageBytes() - 1) << Instruction::SIGNEXTEND;
 		else
-			m_context << ((u256(0x1) << (8 * m_dataType->storageBytes())) - 1) << solidity::Instruction::AND;
+			m_context << ((u256(0x1) << (8 * m_dataType->storageBytes())) - 1) << Instruction::AND;
 	}
 }
 
@@ -202,32 +202,32 @@ void StorageItem::storeValue(Type const& _sourceType, SourceLocation const& _loc
 		if (m_dataType->storageBytes() == 32)
 		{
 			// offset should be zero
-			m_context << solidity::Instruction::POP;
+			m_context << Instruction::POP;
 			if (!_move)
-				m_context << solidity::Instruction::DUP2 << solidity::Instruction::SWAP1;
-			m_context << solidity::Instruction::SSTORE;
+				m_context << Instruction::DUP2 << Instruction::SWAP1;
+			m_context << Instruction::SSTORE;
 		}
 		else
 		{
 			// OR the value into the other values in the storage slot
-			m_context << u256(0x100) << solidity::Instruction::EXP;
+			m_context << u256(0x100) << Instruction::EXP;
 			// stack: value storage_ref multiplier
 			// fetch old value
-			m_context << solidity::Instruction::DUP2 << solidity::Instruction::SLOAD;
+			m_context << Instruction::DUP2 << Instruction::SLOAD;
 			// stack: value storege_ref multiplier old_full_value
 			// clear bytes in old value
 			m_context
-				<< solidity::Instruction::DUP2 << ((u256(1) << (8 * m_dataType->storageBytes())) - 1)
-				<< solidity::Instruction::MUL;
-			m_context << solidity::Instruction::NOT << solidity::Instruction::AND;
+				<< Instruction::DUP2 << ((u256(1) << (8 * m_dataType->storageBytes())) - 1)
+				<< Instruction::MUL;
+			m_context << Instruction::NOT << Instruction::AND;
 			// stack: value storage_ref multiplier cleared_value
 			m_context
-				<< solidity::Instruction::SWAP1 << solidity::Instruction::DUP4;
+				<< Instruction::SWAP1 << Instruction::DUP4;
 			// stack: value storage_ref cleared_value multiplier value
 			if (m_dataType->category() == Type::Category::FixedBytes)
 				m_context
 					<< (u256(0x1) << (256 - 8 * dynamic_cast<FixedBytesType const&>(*m_dataType).numBytes()))
-					<< solidity::Instruction::SWAP1 << solidity::Instruction::DIV;
+					<< Instruction::SWAP1 << Instruction::DIV;
 			else if (
 				m_dataType->category() == Type::Category::Integer &&
 				dynamic_cast<IntegerType const&>(*m_dataType).isSigned()
@@ -235,15 +235,15 @@ void StorageItem::storeValue(Type const& _sourceType, SourceLocation const& _loc
 				// remove the higher order bits
 				m_context
 					<< (u256(1) << (8 * (32 - m_dataType->storageBytes())))
-					<< solidity::Instruction::SWAP1
-					<< solidity::Instruction::DUP2
-					<< solidity::Instruction::MUL
-					<< solidity::Instruction::DIV;
-			m_context  << solidity::Instruction::MUL << solidity::Instruction::OR;
+					<< Instruction::SWAP1
+					<< Instruction::DUP2
+					<< Instruction::MUL
+					<< Instruction::DIV;
+			m_context  << Instruction::MUL << Instruction::OR;
 			// stack: value storage_ref updated_value
-			m_context << solidity::Instruction::SWAP1 << solidity::Instruction::SSTORE;
+			m_context << Instruction::SWAP1 << Instruction::SSTORE;
 			if (_move)
-				m_context << solidity::Instruction::POP;
+				m_context << Instruction::POP;
 		}
 	}
 	else
@@ -253,19 +253,19 @@ void StorageItem::storeValue(Type const& _sourceType, SourceLocation const& _loc
 			"Wrong type conversation for assignment.");
 		if (m_dataType->category() == Type::Category::Array)
 		{
-			m_context << solidity::Instruction::POP; // remove byte offset
+			m_context << Instruction::POP; // remove byte offset
 			ArrayUtils(m_context).copyArrayToStorage(
 				dynamic_cast<ArrayType const&>(*m_dataType),
 				dynamic_cast<ArrayType const&>(_sourceType)
 			);
 			if (_move)
-				m_context << solidity::Instruction::POP;
+				m_context << Instruction::POP;
 		}
 		else if (m_dataType->category() == Type::Category::Struct)
 		{
 			// stack layout: source_ref target_ref target_offset
 			// note that we have structs, so offset should be zero and are ignored
-			m_context << solidity::Instruction::POP;
+			m_context << Instruction::POP;
 			auto const& structType = dynamic_cast<StructType const&>(*m_dataType);
 			auto const& sourceType = dynamic_cast<StructType const&>(_sourceType);
 			solAssert(
@@ -284,7 +284,7 @@ void StorageItem::storeValue(Type const& _sourceType, SourceLocation const& _loc
 				{
 					// stack layout: source_ref target_ref
 					pair<u256, unsigned> const& offsets = sourceType.storageOffsetsOfMember(member.name);
-					m_context << offsets.first << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
+					m_context << offsets.first << Instruction::DUP3 << Instruction::ADD;
 					m_context << u256(offsets.second);
 					// stack: source_ref target_ref source_member_ref source_member_off
 					StorageItem(m_context, *sourceMemberType).retrieveValue(_location, true);
@@ -296,13 +296,13 @@ void StorageItem::storeValue(Type const& _sourceType, SourceLocation const& _loc
 					// stack layout: source_ref target_ref
 					TypePointer sourceMemberType = sourceType.memberType(member.name);
 					m_context << sourceType.memoryOffsetOfMember(member.name);
-					m_context << solidity::Instruction::DUP3 << solidity::Instruction::ADD;
+					m_context << Instruction::DUP3 << Instruction::ADD;
 					MemoryItem(m_context, *sourceMemberType).retrieveValue(_location, true);
 					// stack layout: source_ref target_ref source_value...
 				}
 				unsigned stackSize = sourceMemberType->sizeOnStack();
 				pair<u256, unsigned> const& offsets = structType.storageOffsetsOfMember(member.name);
-				m_context << solidity::dupInstruction(1 + stackSize) << offsets.first << solidity::Instruction::ADD;
+				m_context << dupInstruction(1 + stackSize) << offsets.first << Instruction::ADD;
 				m_context << u256(offsets.second);
 				// stack: source_ref target_ref target_off source_value... target_member_ref target_member_byte_off
 				StorageItem(m_context, *memberType).storeValue(*sourceMemberType, _location, true);
@@ -312,7 +312,7 @@ void StorageItem::storeValue(Type const& _sourceType, SourceLocation const& _loc
 			if (_move)
 				utils.popStackSlots(2);
 			else
-				m_context << solidity::Instruction::SWAP1 << solidity::Instruction::POP;
+				m_context << Instruction::SWAP1 << Instruction::POP;
 		}
 		else
 			BOOST_THROW_EXCEPTION(
@@ -344,12 +344,12 @@ void StorageItem::setToZero(SourceLocation const&, bool _removeReference) const
 				continue;
 			pair<u256, unsigned> const& offsets = structType.storageOffsetsOfMember(member.name);
 			m_context
-				<< offsets.first << solidity::Instruction::DUP3 << solidity::Instruction::ADD
+				<< offsets.first << Instruction::DUP3 << Instruction::ADD
 				<< u256(offsets.second);
 			StorageItem(m_context, *memberType).setToZero();
 		}
 		if (_removeReference)
-			m_context << solidity::Instruction::POP << solidity::Instruction::POP;
+			m_context << Instruction::POP << Instruction::POP;
 	}
 	else
 	{
@@ -360,23 +360,23 @@ void StorageItem::setToZero(SourceLocation const&, bool _removeReference) const
 		{
 			// offset should be zero
 			m_context
-				<< solidity::Instruction::POP << u256(0)
-				<< solidity::Instruction::SWAP1 << solidity::Instruction::SSTORE;
+				<< Instruction::POP << u256(0)
+				<< Instruction::SWAP1 << Instruction::SSTORE;
 		}
 		else
 		{
-			m_context << u256(0x100) << solidity::Instruction::EXP;
+			m_context << u256(0x100) << Instruction::EXP;
 			// stack: storage_ref multiplier
 			// fetch old value
-			m_context << solidity::Instruction::DUP2 << solidity::Instruction::SLOAD;
+			m_context << Instruction::DUP2 << Instruction::SLOAD;
 			// stack: storege_ref multiplier old_full_value
 			// clear bytes in old value
 			m_context
-				<< solidity::Instruction::SWAP1 << ((u256(1) << (8 * m_dataType->storageBytes())) - 1)
-				<< solidity::Instruction::MUL;
-			m_context << solidity::Instruction::NOT << solidity::Instruction::AND;
+				<< Instruction::SWAP1 << ((u256(1) << (8 * m_dataType->storageBytes())) - 1)
+				<< Instruction::MUL;
+			m_context << Instruction::NOT << Instruction::AND;
 			// stack: storage_ref cleared_value
-			m_context << solidity::Instruction::SWAP1 << solidity::Instruction::SSTORE;
+			m_context << Instruction::SWAP1 << Instruction::SSTORE;
 		}
 	}
 }
@@ -393,48 +393,48 @@ void StorageByteArrayElement::retrieveValue(SourceLocation const&, bool _remove)
 {
 	// stack: ref byte_number
 	if (_remove)
-		m_context << solidity::Instruction::SWAP1 << solidity::Instruction::SLOAD
-			<< solidity::Instruction::SWAP1 << solidity::Instruction::BYTE;
+		m_context << Instruction::SWAP1 << Instruction::SLOAD
+			<< Instruction::SWAP1 << Instruction::BYTE;
 	else
-		m_context << solidity::Instruction::DUP2 << solidity::Instruction::SLOAD
-			<< solidity::Instruction::DUP2 << solidity::Instruction::BYTE;
-	m_context << (u256(1) << (256 - 8)) << solidity::Instruction::MUL;
+		m_context << Instruction::DUP2 << Instruction::SLOAD
+			<< Instruction::DUP2 << Instruction::BYTE;
+	m_context << (u256(1) << (256 - 8)) << Instruction::MUL;
 }
 
 void StorageByteArrayElement::storeValue(Type const&, SourceLocation const&, bool _move) const
 {
 	// stack: value ref byte_number
-	m_context << u256(31) << solidity::Instruction::SUB << u256(0x100) << solidity::Instruction::EXP;
+	m_context << u256(31) << Instruction::SUB << u256(0x100) << Instruction::EXP;
 	// stack: value ref (1<<(8*(31-byte_number)))
-	m_context << solidity::Instruction::DUP2 << solidity::Instruction::SLOAD;
+	m_context << Instruction::DUP2 << Instruction::SLOAD;
 	// stack: value ref (1<<(8*(31-byte_number))) old_full_value
 	// clear byte in old value
-	m_context << solidity::Instruction::DUP2 << u256(0xff) << solidity::Instruction::MUL
-		<< solidity::Instruction::NOT << solidity::Instruction::AND;
+	m_context << Instruction::DUP2 << u256(0xff) << Instruction::MUL
+		<< Instruction::NOT << Instruction::AND;
 	// stack: value ref (1<<(32-byte_number)) old_full_value_with_cleared_byte
-	m_context << solidity::Instruction::SWAP1;
-	m_context << (u256(1) << (256 - 8)) << solidity::Instruction::DUP5 << solidity::Instruction::DIV
-		<< solidity::Instruction::MUL << solidity::Instruction::OR;
+	m_context << Instruction::SWAP1;
+	m_context << (u256(1) << (256 - 8)) << Instruction::DUP5 << Instruction::DIV
+		<< Instruction::MUL << Instruction::OR;
 	// stack: value ref new_full_value
-	m_context << solidity::Instruction::SWAP1 << solidity::Instruction::SSTORE;
+	m_context << Instruction::SWAP1 << Instruction::SSTORE;
 	if (_move)
-		m_context << solidity::Instruction::POP;
+		m_context << Instruction::POP;
 }
 
 void StorageByteArrayElement::setToZero(SourceLocation const&, bool _removeReference) const
 {
 	// stack: ref byte_number
 	if (!_removeReference)
-		m_context << solidity::Instruction::DUP2 << solidity::Instruction::DUP2;
-	m_context << u256(31) << solidity::Instruction::SUB << u256(0x100) << solidity::Instruction::EXP;
+		m_context << Instruction::DUP2 << Instruction::DUP2;
+	m_context << u256(31) << Instruction::SUB << u256(0x100) << Instruction::EXP;
 	// stack: ref (1<<(8*(31-byte_number)))
-	m_context << solidity::Instruction::DUP2 << solidity::Instruction::SLOAD;
+	m_context << Instruction::DUP2 << Instruction::SLOAD;
 	// stack: ref (1<<(8*(31-byte_number))) old_full_value
 	// clear byte in old value
-	m_context << solidity::Instruction::SWAP1 << u256(0xff) << solidity::Instruction::MUL;
-	m_context << solidity::Instruction::NOT << solidity::Instruction::AND;
+	m_context << Instruction::SWAP1 << u256(0xff) << Instruction::MUL;
+	m_context << Instruction::NOT << Instruction::AND;
 	// stack: ref old_full_value_with_cleared_byte
-	m_context << solidity::Instruction::SWAP1 << solidity::Instruction::SSTORE;
+	m_context << Instruction::SWAP1 << Instruction::SSTORE;
 }
 
 StorageArrayLength::StorageArrayLength(CompilerContext& _compilerContext, const ArrayType& _arrayType):
@@ -448,22 +448,22 @@ void StorageArrayLength::retrieveValue(SourceLocation const&, bool _remove) cons
 {
 	ArrayUtils(m_context).retrieveLength(m_arrayType);
 	if (_remove)
-		m_context << solidity::Instruction::SWAP1 << solidity::Instruction::POP;
+		m_context << Instruction::SWAP1 << Instruction::POP;
 }
 
 void StorageArrayLength::storeValue(Type const&, SourceLocation const&, bool _move) const
 {
 	if (_move)
-		m_context << solidity::Instruction::SWAP1;
+		m_context << Instruction::SWAP1;
 	else
-		m_context << solidity::Instruction::DUP2;
+		m_context << Instruction::DUP2;
 	ArrayUtils(m_context).resizeDynamicArray(m_arrayType);
 }
 
 void StorageArrayLength::setToZero(SourceLocation const&, bool _removeReference) const
 {
 	if (!_removeReference)
-		m_context << solidity::Instruction::DUP1;
+		m_context << Instruction::DUP1;
 	ArrayUtils(m_context).clearDynamicArray(m_arrayType);
 }
 
diff --git a/libsolidity/interface/GasEstimator.cpp b/libsolidity/interface/GasEstimator.cpp
index f634a96d..99ed75bc 100644
--- a/libsolidity/interface/GasEstimator.cpp
+++ b/libsolidity/interface/GasEstimator.cpp
@@ -137,8 +137,8 @@ GasEstimator::GasConsumption GasEstimator::functionalEstimation(
 		using Id = ExpressionClasses::Id;
 		using Ids = vector<Id>;
 		Id hashValue = classes.find(u256(FixedHash<4>::Arith(FixedHash<4>(dev::sha3(_signature)))));
-		Id calldata = classes.find(solidity::Instruction::CALLDATALOAD, Ids{classes.find(u256(0))});
-		classes.forceEqual(hashValue, solidity::Instruction::DIV, Ids{
+		Id calldata = classes.find(Instruction::CALLDATALOAD, Ids{classes.find(u256(0))});
+		classes.forceEqual(hashValue, Instruction::DIV, Ids{
 			calldata,
 			classes.find(u256(1) << (8 * 28))
 		});
@@ -165,7 +165,7 @@ GasEstimator::GasConsumption GasEstimator::functionalEstimation(
 	AssemblyItem invalidTag(PushTag, u256(-0x10));
 	state->feedItem(invalidTag, true);
 	if (parametersSize > 0)
-		state->feedItem(solidity::swapInstruction(parametersSize));
+		state->feedItem(swapInstruction(parametersSize));
 
 	return PathGasMeter(_items).estimateMax(_offset, state);
 }
diff --git a/test/libsolidity/SolidityExpressionCompiler.cpp b/test/libsolidity/SolidityExpressionCompiler.cpp
index e7cf7e24..a201604b 100644
--- a/test/libsolidity/SolidityExpressionCompiler.cpp
+++ b/test/libsolidity/SolidityExpressionCompiler.cpp
@@ -174,7 +174,7 @@ BOOST_AUTO_TEST_CASE(literal_true)
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x1});
+	bytes expectation({byte(Instruction::PUSH1), 0x1});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -185,7 +185,7 @@ BOOST_AUTO_TEST_CASE(literal_false)
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x0});
+	bytes expectation({byte(Instruction::PUSH1), 0x0});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -196,7 +196,7 @@ BOOST_AUTO_TEST_CASE(int_literal)
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation({byte(solidity::Instruction::PUSH10), 0x12, 0x34, 0x56, 0x78, 0x90,
+	bytes expectation({byte(Instruction::PUSH10), 0x12, 0x34, 0x56, 0x78, 0x90,
 													   0x12, 0x34, 0x56, 0x78, 0x90});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
@@ -212,7 +212,7 @@ BOOST_AUTO_TEST_CASE(int_with_wei_ether_subdenomination)
 		})";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x1});
+	bytes expectation({byte(Instruction::PUSH1), 0x1});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -227,7 +227,7 @@ BOOST_AUTO_TEST_CASE(int_with_szabo_ether_subdenomination)
 		})";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation({byte(solidity::Instruction::PUSH5), 0xe8, 0xd4, 0xa5, 0x10, 0x00});
+	bytes expectation({byte(Instruction::PUSH5), 0xe8, 0xd4, 0xa5, 0x10, 0x00});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -242,7 +242,7 @@ BOOST_AUTO_TEST_CASE(int_with_finney_ether_subdenomination)
 		})";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation({byte(solidity::Instruction::PUSH7), 0x3, 0x8d, 0x7e, 0xa4, 0xc6, 0x80, 0x00});
+	bytes expectation({byte(Instruction::PUSH7), 0x3, 0x8d, 0x7e, 0xa4, 0xc6, 0x80, 0x00});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -257,7 +257,7 @@ BOOST_AUTO_TEST_CASE(int_with_ether_ether_subdenomination)
 		})";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation({byte(solidity::Instruction::PUSH8), 0xd, 0xe0, 0xb6, 0xb3, 0xa7, 0x64, 0x00, 0x00});
+	bytes expectation({byte(Instruction::PUSH8), 0xd, 0xe0, 0xb6, 0xb3, 0xa7, 0x64, 0x00, 0x00});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -268,12 +268,12 @@ BOOST_AUTO_TEST_CASE(comparison)
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x1,
-					   byte(solidity::Instruction::PUSH2), 0x11, 0xaa,
-					   byte(solidity::Instruction::PUSH2), 0x10, 0xaa,
-					   byte(solidity::Instruction::LT),
-					   byte(solidity::Instruction::EQ),
-					   byte(solidity::Instruction::ISZERO)});
+	bytes expectation({byte(Instruction::PUSH1), 0x1,
+					   byte(Instruction::PUSH2), 0x11, 0xaa,
+					   byte(Instruction::PUSH2), 0x10, 0xaa,
+					   byte(Instruction::LT),
+					   byte(Instruction::EQ),
+					   byte(Instruction::ISZERO)});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -284,22 +284,22 @@ BOOST_AUTO_TEST_CASE(short_circuiting)
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x12, // 8 + 10
-					   byte(solidity::Instruction::PUSH1), 0x4,
-					   byte(solidity::Instruction::GT),
-					   byte(solidity::Instruction::ISZERO), // after this we have 4 <= 8 + 10
-					   byte(solidity::Instruction::DUP1),
-					   byte(solidity::Instruction::PUSH1), 0x11,
-					   byte(solidity::Instruction::JUMPI), // short-circuit if it is true
-					   byte(solidity::Instruction::POP),
-					   byte(solidity::Instruction::PUSH1), 0x2,
-					   byte(solidity::Instruction::PUSH1), 0x9,
-					   byte(solidity::Instruction::EQ),
-					   byte(solidity::Instruction::ISZERO), // after this we have 9 != 2
-					   byte(solidity::Instruction::JUMPDEST),
-					   byte(solidity::Instruction::PUSH1), 0x1,
-					   byte(solidity::Instruction::EQ),
-					   byte(solidity::Instruction::ISZERO)});
+	bytes expectation({byte(Instruction::PUSH1), 0x12, // 8 + 10
+					   byte(Instruction::PUSH1), 0x4,
+					   byte(Instruction::GT),
+					   byte(Instruction::ISZERO), // after this we have 4 <= 8 + 10
+					   byte(Instruction::DUP1),
+					   byte(Instruction::PUSH1), 0x11,
+					   byte(Instruction::JUMPI), // short-circuit if it is true
+					   byte(Instruction::POP),
+					   byte(Instruction::PUSH1), 0x2,
+					   byte(Instruction::PUSH1), 0x9,
+					   byte(Instruction::EQ),
+					   byte(Instruction::ISZERO), // after this we have 9 != 2
+					   byte(Instruction::JUMPDEST),
+					   byte(Instruction::PUSH1), 0x1,
+					   byte(Instruction::EQ),
+					   byte(Instruction::ISZERO)});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -309,23 +309,23 @@ BOOST_AUTO_TEST_CASE(arithmetics)
 							 "  function f(uint y) { var x = ((((((((y ^ 8) & 7) | 6) - 5) + 4) % 3) / 2) * 1); }"
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode, {}, {{"test", "f", "y"}, {"test", "f", "x"}});
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x1,
-					   byte(solidity::Instruction::PUSH1), 0x2,
-					   byte(solidity::Instruction::PUSH1), 0x3,
-					   byte(solidity::Instruction::PUSH1), 0x4,
-					   byte(solidity::Instruction::PUSH1), 0x5,
-					   byte(solidity::Instruction::PUSH1), 0x6,
-					   byte(solidity::Instruction::PUSH1), 0x7,
-					   byte(solidity::Instruction::PUSH1), 0x8,
-					   byte(solidity::Instruction::DUP10),
-					   byte(solidity::Instruction::XOR),
-					   byte(solidity::Instruction::AND),
-					   byte(solidity::Instruction::OR),
-					   byte(solidity::Instruction::SUB),
-					   byte(solidity::Instruction::ADD),
-					   byte(solidity::Instruction::MOD),
-					   byte(solidity::Instruction::DIV),
-					   byte(solidity::Instruction::MUL)});
+	bytes expectation({byte(Instruction::PUSH1), 0x1,
+					   byte(Instruction::PUSH1), 0x2,
+					   byte(Instruction::PUSH1), 0x3,
+					   byte(Instruction::PUSH1), 0x4,
+					   byte(Instruction::PUSH1), 0x5,
+					   byte(Instruction::PUSH1), 0x6,
+					   byte(Instruction::PUSH1), 0x7,
+					   byte(Instruction::PUSH1), 0x8,
+					   byte(Instruction::DUP10),
+					   byte(Instruction::XOR),
+					   byte(Instruction::AND),
+					   byte(Instruction::OR),
+					   byte(Instruction::SUB),
+					   byte(Instruction::ADD),
+					   byte(Instruction::MOD),
+					   byte(Instruction::DIV),
+					   byte(Instruction::MUL)});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -336,13 +336,13 @@ BOOST_AUTO_TEST_CASE(unary_operators)
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode, {}, {{"test", "f", "y"}, {"test", "f", "x"}});
 
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x2,
-					   byte(solidity::Instruction::DUP3),
-					   byte(solidity::Instruction::PUSH1), 0x0,
-					   byte(solidity::Instruction::SUB),
-					   byte(solidity::Instruction::NOT),
-					   byte(solidity::Instruction::EQ),
-					   byte(solidity::Instruction::ISZERO)});
+	bytes expectation({byte(Instruction::PUSH1), 0x2,
+					   byte(Instruction::DUP3),
+					   byte(Instruction::PUSH1), 0x0,
+					   byte(Instruction::SUB),
+					   byte(Instruction::NOT),
+					   byte(Instruction::EQ),
+					   byte(Instruction::ISZERO)});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -354,44 +354,44 @@ BOOST_AUTO_TEST_CASE(unary_inc_dec)
 	bytes code = compileFirstExpression(sourceCode, {}, {{"test", "f", "a"}, {"test", "f", "x"}});
 
 	// Stack: a, x
-	bytes expectation({byte(solidity::Instruction::DUP2),
-					   byte(solidity::Instruction::DUP1),
-					   byte(solidity::Instruction::PUSH1), 0x1,
-					   byte(solidity::Instruction::ADD),
+	bytes expectation({byte(Instruction::DUP2),
+					   byte(Instruction::DUP1),
+					   byte(Instruction::PUSH1), 0x1,
+					   byte(Instruction::ADD),
 					   // Stack here: a x a (a+1)
-					   byte(solidity::Instruction::SWAP3),
-					   byte(solidity::Instruction::POP), // first ++
+					   byte(Instruction::SWAP3),
+					   byte(Instruction::POP), // first ++
 					   // Stack here: (a+1) x a
-					   byte(solidity::Instruction::DUP3),
-					   byte(solidity::Instruction::PUSH1), 0x1,
-					   byte(solidity::Instruction::ADD),
+					   byte(Instruction::DUP3),
+					   byte(Instruction::PUSH1), 0x1,
+					   byte(Instruction::ADD),
 					   // Stack here: (a+1) x a (a+2)
-					   byte(solidity::Instruction::SWAP3),
-					   byte(solidity::Instruction::POP),
+					   byte(Instruction::SWAP3),
+					   byte(Instruction::POP),
 					   // Stack here: (a+2) x a
-					   byte(solidity::Instruction::DUP3), // second ++
-					   byte(solidity::Instruction::XOR),
+					   byte(Instruction::DUP3), // second ++
+					   byte(Instruction::XOR),
 					   // Stack here: (a+2) x a^(a+2)
-					   byte(solidity::Instruction::DUP3),
-					   byte(solidity::Instruction::DUP1),
-					   byte(solidity::Instruction::PUSH1), 0x1,
-					   byte(solidity::Instruction::SWAP1),
-					   byte(solidity::Instruction::SUB),
+					   byte(Instruction::DUP3),
+					   byte(Instruction::DUP1),
+					   byte(Instruction::PUSH1), 0x1,
+					   byte(Instruction::SWAP1),
+					   byte(Instruction::SUB),
 					   // Stack here: (a+2) x a^(a+2) (a+2) (a+1)
-					   byte(solidity::Instruction::SWAP4),
-					   byte(solidity::Instruction::POP), // first --
-					   byte(solidity::Instruction::XOR),
+					   byte(Instruction::SWAP4),
+					   byte(Instruction::POP), // first --
+					   byte(Instruction::XOR),
 					   // Stack here: (a+1) x a^(a+2)^(a+2)
-					   byte(solidity::Instruction::DUP3),
-					   byte(solidity::Instruction::PUSH1), 0x1,
-					   byte(solidity::Instruction::SWAP1),
-					   byte(solidity::Instruction::SUB),
+					   byte(Instruction::DUP3),
+					   byte(Instruction::PUSH1), 0x1,
+					   byte(Instruction::SWAP1),
+					   byte(Instruction::SUB),
 					   // Stack here: (a+1) x a^(a+2)^(a+2) a
-					   byte(solidity::Instruction::SWAP3),
-					   byte(solidity::Instruction::POP), // second ++
+					   byte(Instruction::SWAP3),
+					   byte(Instruction::POP), // second ++
 					   // Stack here: a x a^(a+2)^(a+2)
-					   byte(solidity::Instruction::DUP3), // will change
-					   byte(solidity::Instruction::XOR)});
+					   byte(Instruction::DUP3), // will change
+					   byte(Instruction::XOR)});
 					   // Stack here: a x a^(a+2)^(a+2)^a
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
@@ -404,16 +404,16 @@ BOOST_AUTO_TEST_CASE(assignment)
 	bytes code = compileFirstExpression(sourceCode, {}, {{"test", "f", "a"}, {"test", "f", "b"}});
 
 	// Stack: a, b
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x2,
-					   byte(solidity::Instruction::DUP2),
-					   byte(solidity::Instruction::DUP4),
-					   byte(solidity::Instruction::ADD),
+	bytes expectation({byte(Instruction::PUSH1), 0x2,
+					   byte(Instruction::DUP2),
+					   byte(Instruction::DUP4),
+					   byte(Instruction::ADD),
 					   // Stack here: a b 2 a+b
-					   byte(solidity::Instruction::SWAP3),
-					   byte(solidity::Instruction::POP),
-					   byte(solidity::Instruction::DUP3),
+					   byte(Instruction::SWAP3),
+					   byte(Instruction::POP),
+					   byte(Instruction::DUP3),
 					   // Stack here: a+b b 2 a+b
-					   byte(solidity::Instruction::MUL)});
+					   byte(Instruction::MUL)});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -427,26 +427,26 @@ BOOST_AUTO_TEST_CASE(function_call)
 										{{"test", "f", "a"}, {"test", "f", "b"}});
 
 	// Stack: a, b
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x02,
-					   byte(solidity::Instruction::PUSH1), 0x0c,
-					   byte(solidity::Instruction::PUSH1), 0x01,
-					   byte(solidity::Instruction::DUP5),
-					   byte(solidity::Instruction::ADD),
+	bytes expectation({byte(Instruction::PUSH1), 0x02,
+					   byte(Instruction::PUSH1), 0x0c,
+					   byte(Instruction::PUSH1), 0x01,
+					   byte(Instruction::DUP5),
+					   byte(Instruction::ADD),
 					   // Stack here: a b 2 <ret label> (a+1)
-					   byte(solidity::Instruction::DUP4),
-					   byte(solidity::Instruction::PUSH1), 0x13,
-					   byte(solidity::Instruction::JUMP),
-					   byte(solidity::Instruction::JUMPDEST),
+					   byte(Instruction::DUP4),
+					   byte(Instruction::PUSH1), 0x13,
+					   byte(Instruction::JUMP),
+					   byte(Instruction::JUMPDEST),
 					   // Stack here: a b 2 g(a+1, b)
-					   byte(solidity::Instruction::MUL),
+					   byte(Instruction::MUL),
 					   // Stack here: a b g(a+1, b)*2
-					   byte(solidity::Instruction::DUP3),
-					   byte(solidity::Instruction::ADD),
+					   byte(Instruction::DUP3),
+					   byte(Instruction::ADD),
 					   // Stack here: a b a+g(a+1, b)*2
-					   byte(solidity::Instruction::SWAP2),
-					   byte(solidity::Instruction::POP),
-					   byte(solidity::Instruction::DUP2),
-					   byte(solidity::Instruction::JUMPDEST)});
+					   byte(Instruction::SWAP2),
+					   byte(Instruction::POP),
+					   byte(Instruction::DUP2),
+					   byte(Instruction::JUMPDEST)});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -457,7 +457,7 @@ BOOST_AUTO_TEST_CASE(negative_literals_8bits)
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation(bytes({byte(solidity::Instruction::PUSH32)}) + bytes(31, 0xff) + bytes(1, 0x80));
+	bytes expectation(bytes({byte(Instruction::PUSH32)}) + bytes(31, 0xff) + bytes(1, 0x80));
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -468,7 +468,7 @@ BOOST_AUTO_TEST_CASE(negative_literals_16bits)
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation(bytes({byte(solidity::Instruction::PUSH32)}) + bytes(30, 0xff) + bytes{0xf5, 0x43});
+	bytes expectation(bytes({byte(Instruction::PUSH32)}) + bytes(30, 0xff) + bytes{0xf5, 0x43});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -481,7 +481,7 @@ BOOST_AUTO_TEST_CASE(intermediately_overflowing_literals)
 							 "}\n";
 	bytes code = compileFirstExpression(sourceCode);
 
-	bytes expectation(bytes({byte(solidity::Instruction::PUSH1), 0xbf}));
+	bytes expectation(bytes({byte(Instruction::PUSH1), 0xbf}));
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }
 
@@ -495,8 +495,8 @@ BOOST_AUTO_TEST_CASE(blockhash)
 	bytes code = compileFirstExpression(sourceCode, {}, {},
 										{make_shared<MagicVariableDeclaration>("block", make_shared<MagicType>(MagicType::Kind::Block))});
 
-	bytes expectation({byte(solidity::Instruction::PUSH1), 0x03,
-					   byte(solidity::Instruction::BLOCKHASH)});
+	bytes expectation({byte(Instruction::PUSH1), 0x03,
+					   byte(Instruction::BLOCKHASH)});
 	BOOST_CHECK_EQUAL_COLLECTIONS(code.begin(), code.end(), expectation.begin(), expectation.end());
 }