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ExpressionCompiler.cpp
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ExpressionCompiler.cpp
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/*
This file is part of cpp-ethereum.
cpp-ethereum is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
cpp-ethereum is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @author Christian <c@ethdev.com>
* @date 2014
* Solidity AST to EVM bytecode compiler for expressions.
*/
#include <utility>
#include <numeric>
#include <boost/range/adaptor/reversed.hpp>
#include <libdevcore/Common.h>
#include <libdevcore/SHA3.h>
#include <libsolidity/ast/AST.h>
#include <libsolidity/codegen/ExpressionCompiler.h>
#include <libsolidity/codegen/CompilerContext.h>
#include <libsolidity/codegen/CompilerUtils.h>
#include <libsolidity/codegen/LValue.h>
#include <libevmasm/GasMeter.h>
using namespace std;
namespace dev
{
namespace solidity
{
void ExpressionCompiler::compile(Expression const& _expression)
{
_expression.accept(*this);
}
void ExpressionCompiler::appendStateVariableInitialization(VariableDeclaration const& _varDecl)
{
if (!_varDecl.value())
return;
TypePointer type = _varDecl.value()->annotation().type;
solAssert(!!type, "Type information not available.");
CompilerContext::LocationSetter locationSetter(m_context, _varDecl);
_varDecl.value()->accept(*this);
if (_varDecl.annotation().type->dataStoredIn(DataLocation::Storage))
{
// reference type, only convert value to mobile type and do final conversion in storeValue.
utils().convertType(*type, *type->mobileType());
type = type->mobileType();
}
else
{
utils().convertType(*type, *_varDecl.annotation().type);
type = _varDecl.annotation().type;
}
StorageItem(m_context, _varDecl).storeValue(*type, _varDecl.location(), true);
}
void ExpressionCompiler::appendConstStateVariableAccessor(VariableDeclaration const& _varDecl)
{
solAssert(_varDecl.isConstant(), "");
_varDecl.value()->accept(*this);
utils().convertType(*_varDecl.value()->annotation().type, *_varDecl.annotation().type);
// append return
m_context << dupInstruction(_varDecl.annotation().type->sizeOnStack() + 1);
m_context.appendJump(eth::AssemblyItem::JumpType::OutOfFunction);
}
void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const& _varDecl)
{
solAssert(!_varDecl.isConstant(), "");
CompilerContext::LocationSetter locationSetter(m_context, _varDecl);
FunctionType accessorType(_varDecl);
TypePointers paramTypes = accessorType.parameterTypes();
// retrieve the position of the variable
auto const& location = m_context.storageLocationOfVariable(_varDecl);
m_context << location.first << u256(location.second);
TypePointer returnType = _varDecl.annotation().type;
for (size_t i = 0; i < paramTypes.size(); ++i)
{
if (auto mappingType = dynamic_cast<MappingType const*>(returnType.get()))
{
solAssert(CompilerUtils::freeMemoryPointer >= 0x40, "");
solAssert(
!paramTypes[i]->isDynamicallySized(),
"Accessors for mapping with dynamically-sized keys not yet implemented."
);
// pop offset
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) << Instruction::SHA3;
// push offset
m_context << u256(0);
returnType = mappingType->valueType();
}
else if (auto arrayType = dynamic_cast<ArrayType const*>(returnType.get()))
{
// pop offset
m_context << Instruction::POP;
utils().copyToStackTop(paramTypes.size() - i + 1, 1);
ArrayUtils(m_context).accessIndex(*arrayType);
returnType = arrayType->baseType();
}
else
solAssert(false, "Index access is allowed only for \"mapping\" and \"array\" types.");
}
// remove index arguments.
if (paramTypes.size() == 1)
m_context << Instruction::SWAP2 << Instruction::POP << Instruction::SWAP1;
else if (paramTypes.size() >= 2)
{
m_context << swapInstruction(paramTypes.size());
m_context << Instruction::POP;
m_context << swapInstruction(paramTypes.size());
utils().popStackSlots(paramTypes.size() - 1);
}
unsigned retSizeOnStack = 0;
solAssert(accessorType.returnParameterTypes().size() >= 1, "");
auto const& returnTypes = accessorType.returnParameterTypes();
if (StructType const* structType = dynamic_cast<StructType const*>(returnType.get()))
{
// remove offset
m_context << Instruction::POP;
auto const& names = accessorType.returnParameterNames();
// struct
for (size_t i = 0; i < names.size(); ++i)
{
if (returnTypes[i]->category() == Type::Category::Mapping)
continue;
if (auto arrayType = dynamic_cast<ArrayType const*>(returnTypes[i].get()))
if (!arrayType->isByteArray())
continue;
pair<u256, unsigned> const& offsets = structType->storageOffsetsOfMember(names[i]);
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]);
utils().moveToStackTop(returnTypes[i]->sizeOnStack());
retSizeOnStack += returnTypes[i]->sizeOnStack();
}
// remove slot
m_context << Instruction::POP;
}
else
{
// simple value or array
solAssert(returnTypes.size() == 1, "");
StorageItem(m_context, *returnType).retrieveValue(SourceLocation(), true);
utils().convertType(*returnType, *returnTypes.front());
retSizeOnStack = returnTypes.front()->sizeOnStack();
}
solAssert(retSizeOnStack == utils().sizeOnStack(returnTypes), "");
solAssert(retSizeOnStack <= 15, "Stack is too deep.");
m_context << dupInstruction(retSizeOnStack + 1);
m_context.appendJump(eth::AssemblyItem::JumpType::OutOfFunction);
}
bool ExpressionCompiler::visit(Conditional const& _condition)
{
CompilerContext::LocationSetter locationSetter(m_context, _condition);
_condition.condition().accept(*this);
eth::AssemblyItem trueTag = m_context.appendConditionalJump();
_condition.falseExpression().accept(*this);
utils().convertType(*_condition.falseExpression().annotation().type, *_condition.annotation().type);
eth::AssemblyItem endTag = m_context.appendJumpToNew();
m_context << trueTag;
int offset = _condition.annotation().type->sizeOnStack();
m_context.adjustStackOffset(-offset);
_condition.trueExpression().accept(*this);
utils().convertType(*_condition.trueExpression().annotation().type, *_condition.annotation().type);
m_context << endTag;
return false;
}
bool ExpressionCompiler::visit(Assignment const& _assignment)
{
CompilerContext::LocationSetter locationSetter(m_context, _assignment);
_assignment.rightHandSide().accept(*this);
// Perform some conversion already. This will convert storage types to memory and literals
// to their actual type, but will not convert e.g. memory to storage.
TypePointer type = _assignment.rightHandSide().annotation().type->closestTemporaryType(
_assignment.leftHandSide().annotation().type
);
utils().convertType(*_assignment.rightHandSide().annotation().type, *type);
_assignment.leftHandSide().accept(*this);
solAssert(!!m_currentLValue, "LValue not retrieved.");
Token::Value op = _assignment.assignmentOperator();
if (op != Token::Assign) // compound assignment
{
solAssert(_assignment.annotation().type->isValueType(), "Compound operators not implemented for non-value types.");
unsigned lvalueSize = m_currentLValue->sizeOnStack();
unsigned itemSize = _assignment.annotation().type->sizeOnStack();
if (lvalueSize > 0)
{
utils().copyToStackTop(lvalueSize + itemSize, itemSize);
utils().copyToStackTop(itemSize + lvalueSize, lvalueSize);
// value lvalue_ref value lvalue_ref
}
m_currentLValue->retrieveValue(_assignment.location(), true);
appendOrdinaryBinaryOperatorCode(Token::AssignmentToBinaryOp(op), *_assignment.annotation().type);
if (lvalueSize > 0)
{
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 << swapInstruction(itemSize + lvalueSize) << Instruction::POP;
}
}
m_currentLValue->storeValue(*type, _assignment.location());
m_currentLValue.reset();
return false;
}
bool ExpressionCompiler::visit(TupleExpression const& _tuple)
{
if (_tuple.isInlineArray())
{
ArrayType const& arrayType = dynamic_cast<ArrayType const&>(*_tuple.annotation().type);
solAssert(!arrayType.isDynamicallySized(), "Cannot create dynamically sized inline array.");
m_context << max(u256(32u), arrayType.memorySize());
utils().allocateMemory();
m_context << Instruction::DUP1;
for (auto const& component: _tuple.components())
{
component->accept(*this);
utils().convertType(*component->annotation().type, *arrayType.baseType(), true);
utils().storeInMemoryDynamic(*arrayType.baseType(), true);
}
m_context << Instruction::POP;
}
else
{
vector<unique_ptr<LValue>> lvalues;
for (auto const& component: _tuple.components())
if (component)
{
component->accept(*this);
if (_tuple.annotation().lValueRequested)
{
solAssert(!!m_currentLValue, "");
lvalues.push_back(move(m_currentLValue));
}
}
else if (_tuple.annotation().lValueRequested)
lvalues.push_back(unique_ptr<LValue>());
if (_tuple.annotation().lValueRequested)
{
if (_tuple.components().size() == 1)
m_currentLValue = move(lvalues[0]);
else
m_currentLValue.reset(new TupleObject(m_context, move(lvalues)));
}
}
return false;
}
bool ExpressionCompiler::visit(UnaryOperation const& _unaryOperation)
{
CompilerContext::LocationSetter locationSetter(m_context, _unaryOperation);
if (_unaryOperation.annotation().type->category() == Type::Category::RationalNumber)
{
m_context << _unaryOperation.annotation().type->literalValue(nullptr);
return false;
}
_unaryOperation.subExpression().accept(*this);
switch (_unaryOperation.getOperator())
{
case Token::Not: // !
m_context << Instruction::ISZERO;
break;
case Token::BitNot: // ~
m_context << Instruction::NOT;
break;
case Token::After: // after
m_context << Instruction::TIMESTAMP << Instruction::ADD;
break;
case Token::Delete: // delete
solAssert(!!m_currentLValue, "LValue not retrieved.");
m_currentLValue->setToZero(_unaryOperation.location());
m_currentLValue.reset();
break;
case Token::Inc: // ++ (pre- or postfix)
case Token::Dec: // -- (pre- or postfix)
solAssert(!!m_currentLValue, "LValue not retrieved.");
m_currentLValue->retrieveValue(_unaryOperation.location());
if (!_unaryOperation.isPrefixOperation())
{
// store value for later
solAssert(_unaryOperation.annotation().type->sizeOnStack() == 1, "Stack size != 1 not implemented.");
m_context << Instruction::DUP1;
if (m_currentLValue->sizeOnStack() > 0)
for (unsigned i = 1 + m_currentLValue->sizeOnStack(); i > 0; --i)
m_context << swapInstruction(i);
}
m_context << u256(1);
if (_unaryOperation.getOperator() == Token::Inc)
m_context << Instruction::ADD;
else
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 << swapInstruction(i);
m_currentLValue->storeValue(
*_unaryOperation.annotation().type, _unaryOperation.location(),
!_unaryOperation.isPrefixOperation());
m_currentLValue.reset();
break;
case Token::Add: // +
// unary add, so basically no-op
break;
case Token::Sub: // -
m_context << u256(0) << Instruction::SUB;
break;
default:
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Invalid unary operator: " +
string(Token::toString(_unaryOperation.getOperator()))));
}
return false;
}
bool ExpressionCompiler::visit(BinaryOperation const& _binaryOperation)
{
CompilerContext::LocationSetter locationSetter(m_context, _binaryOperation);
Expression const& leftExpression = _binaryOperation.leftExpression();
Expression const& rightExpression = _binaryOperation.rightExpression();
solAssert(!!_binaryOperation.annotation().commonType, "");
Type const& commonType = *_binaryOperation.annotation().commonType;
Token::Value const c_op = _binaryOperation.getOperator();
if (c_op == Token::And || c_op == Token::Or) // special case: short-circuiting
appendAndOrOperatorCode(_binaryOperation);
else if (commonType.category() == Type::Category::RationalNumber)
m_context << commonType.literalValue(nullptr);
else
{
bool cleanupNeeded = false;
if (Token::isCompareOp(c_op))
cleanupNeeded = true;
if (commonType.category() == Type::Category::Integer && (c_op == Token::Div || c_op == Token::Mod))
cleanupNeeded = true;
// for commutative operators, push the literal as late as possible to allow improved optimization
auto isLiteral = [](Expression const& _e)
{
return dynamic_cast<Literal const*>(&_e) || _e.annotation().type->category() == Type::Category::RationalNumber;
};
bool swap = m_optimize && Token::isCommutativeOp(c_op) && isLiteral(rightExpression) && !isLiteral(leftExpression);
if (swap)
{
leftExpression.accept(*this);
utils().convertType(*leftExpression.annotation().type, commonType, cleanupNeeded);
rightExpression.accept(*this);
utils().convertType(*rightExpression.annotation().type, commonType, cleanupNeeded);
}
else
{
rightExpression.accept(*this);
utils().convertType(*rightExpression.annotation().type, commonType, cleanupNeeded);
leftExpression.accept(*this);
utils().convertType(*leftExpression.annotation().type, commonType, cleanupNeeded);
}
if (Token::isCompareOp(c_op))
appendCompareOperatorCode(c_op, commonType);
else
appendOrdinaryBinaryOperatorCode(c_op, commonType);
}
// do not visit the child nodes, we already did that explicitly
return false;
}
bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
{
CompilerContext::LocationSetter locationSetter(m_context, _functionCall);
using Location = FunctionType::Location;
if (_functionCall.annotation().isTypeConversion)
{
solAssert(_functionCall.arguments().size() == 1, "");
solAssert(_functionCall.names().empty(), "");
Expression const& firstArgument = *_functionCall.arguments().front();
firstArgument.accept(*this);
utils().convertType(*firstArgument.annotation().type, *_functionCall.annotation().type);
return false;
}
FunctionTypePointer functionType;
if (_functionCall.annotation().isStructConstructorCall)
{
auto const& type = dynamic_cast<TypeType const&>(*_functionCall.expression().annotation().type);
auto const& structType = dynamic_cast<StructType const&>(*type.actualType());
functionType = structType.constructorType();
}
else
functionType = dynamic_pointer_cast<FunctionType const>(_functionCall.expression().annotation().type);
TypePointers parameterTypes = functionType->parameterTypes();
vector<ASTPointer<Expression const>> const& callArguments = _functionCall.arguments();
vector<ASTPointer<ASTString>> const& callArgumentNames = _functionCall.names();
if (!functionType->takesArbitraryParameters())
solAssert(callArguments.size() == parameterTypes.size(), "");
vector<ASTPointer<Expression const>> arguments;
if (callArgumentNames.empty())
// normal arguments
arguments = callArguments;
else
// named arguments
for (auto const& parameterName: functionType->parameterNames())
{
bool found = false;
for (size_t j = 0; j < callArgumentNames.size() && !found; j++)
if ((found = (parameterName == *callArgumentNames[j])))
// we found the actual parameter position
arguments.push_back(callArguments[j]);
solAssert(found, "");
}
if (_functionCall.annotation().isStructConstructorCall)
{
TypeType const& type = dynamic_cast<TypeType const&>(*_functionCall.expression().annotation().type);
auto const& structType = dynamic_cast<StructType const&>(*type.actualType());
m_context << max(u256(32u), structType.memorySize());
utils().allocateMemory();
m_context << Instruction::DUP1;
for (unsigned i = 0; i < arguments.size(); ++i)
{
arguments[i]->accept(*this);
utils().convertType(*arguments[i]->annotation().type, *functionType->parameterTypes()[i]);
utils().storeInMemoryDynamic(*functionType->parameterTypes()[i]);
}
m_context << Instruction::POP;
}
else
{
FunctionType const& function = *functionType;
if (function.bound())
// Only delegatecall and internal functions can be bound, this might be lifted later.
solAssert(function.location() == Location::DelegateCall || function.location() == Location::Internal, "");
switch (function.location())
{
case Location::Internal:
{
// Calling convention: Caller pushes return address and arguments
// Callee removes them and pushes return values
eth::AssemblyItem returnLabel = m_context.pushNewTag();
for (unsigned i = 0; i < arguments.size(); ++i)
{
arguments[i]->accept(*this);
utils().convertType(*arguments[i]->annotation().type, *function.parameterTypes()[i]);
}
_functionCall.expression().accept(*this);
unsigned parameterSize = CompilerUtils::sizeOnStack(function.parameterTypes());
if (function.bound())
{
// stack: arg2, ..., argn, label, arg1
unsigned depth = parameterSize + 1;
utils().moveIntoStack(depth, function.selfType()->sizeOnStack());
parameterSize += function.selfType()->sizeOnStack();
}
m_context.appendJump(eth::AssemblyItem::JumpType::IntoFunction);
m_context << returnLabel;
unsigned returnParametersSize = CompilerUtils::sizeOnStack(function.returnParameterTypes());
// callee adds return parameters, but removes arguments and return label
m_context.adjustStackOffset(returnParametersSize - parameterSize - 1);
break;
}
case Location::External:
case Location::CallCode:
case Location::DelegateCall:
case Location::Bare:
case Location::BareCallCode:
case Location::BareDelegateCall:
_functionCall.expression().accept(*this);
appendExternalFunctionCall(function, arguments);
break;
case Location::Creation:
{
_functionCall.expression().accept(*this);
solAssert(!function.gasSet(), "Gas limit set for contract creation.");
solAssert(function.returnParameterTypes().size() == 1, "");
TypePointers argumentTypes;
for (auto const& arg: arguments)
{
arg->accept(*this);
argumentTypes.push_back(arg->annotation().type);
}
ContractDefinition const& contract =
dynamic_cast<ContractType const&>(*function.returnParameterTypes().front()).contractDefinition();
// copy the contract's code into memory
eth::Assembly const& assembly = m_context.compiledContract(contract);
utils().fetchFreeMemoryPointer();
// pushes size
eth::AssemblyItem subroutine = m_context.addSubroutine(assembly);
m_context << Instruction::DUP1 << subroutine;
m_context << Instruction::DUP4 << Instruction::CODECOPY;
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 << dupInstruction(3);
else
m_context << u256(0);
m_context << Instruction::CREATE;
if (function.valueSet())
m_context << swapInstruction(1) << Instruction::POP;
break;
}
case Location::SetGas:
{
// stack layout: contract_address function_id [gas] [value]
_functionCall.expression().accept(*this);
arguments.front()->accept(*this);
utils().convertType(*arguments.front()->annotation().type, IntegerType(256), true);
// Note that function is not the original function, but the ".gas" function.
// 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 << swapInstruction(stackDepth);
if (function.gasSet())
m_context << Instruction::POP;
break;
}
case Location::SetValue:
// stack layout: contract_address function_id [gas] [value]
_functionCall.expression().accept(*this);
// 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 << Instruction::POP;
arguments.front()->accept(*this);
break;
case Location::Send:
_functionCall.expression().accept(*this);
m_context << u256(0); // do not send gas (there still is the stipend)
arguments.front()->accept(*this);
utils().convertType(
*arguments.front()->annotation().type,
*function.parameterTypes().front(), true
);
appendExternalFunctionCall(
FunctionType(
TypePointers{},
TypePointers{},
strings(),
strings(),
Location::Bare,
false,
nullptr,
true,
true
),
{}
);
break;
case Location::Selfdestruct:
arguments.front()->accept(*this);
utils().convertType(*arguments.front()->annotation().type, *function.parameterTypes().front(), true);
m_context << Instruction::SUICIDE;
break;
case Location::SHA3:
{
TypePointers argumentTypes;
for (auto const& arg: arguments)
{
arg->accept(*this);
argumentTypes.push_back(arg->annotation().type);
}
utils().fetchFreeMemoryPointer();
utils().encodeToMemory(argumentTypes, TypePointers(), function.padArguments(), true);
utils().toSizeAfterFreeMemoryPointer();
m_context << Instruction::SHA3;
break;
}
case Location::Log0:
case Location::Log1:
case Location::Log2:
case Location::Log3:
case Location::Log4:
{
unsigned logNumber = int(function.location()) - int(Location::Log0);
for (unsigned arg = logNumber; arg > 0; --arg)
{
arguments[arg]->accept(*this);
utils().convertType(*arguments[arg]->annotation().type, *function.parameterTypes()[arg], true);
}
arguments.front()->accept(*this);
utils().fetchFreeMemoryPointer();
utils().encodeToMemory(
{arguments.front()->annotation().type},
{function.parameterTypes().front()},
false,
true);
utils().toSizeAfterFreeMemoryPointer();
m_context << logInstruction(logNumber);
break;
}
case Location::Event:
{
_functionCall.expression().accept(*this);
auto const& event = dynamic_cast<EventDefinition const&>(function.declaration());
unsigned numIndexed = 0;
// All indexed arguments go to the stack
for (unsigned arg = arguments.size(); arg > 0; --arg)
if (event.parameters()[arg - 1]->isIndexed())
{
++numIndexed;
arguments[arg - 1]->accept(*this);
if (auto const& arrayType = dynamic_pointer_cast<ArrayType const>(function.parameterTypes()[arg - 1]))
{
utils().fetchFreeMemoryPointer();
utils().encodeToMemory(
{arguments[arg - 1]->annotation().type},
{arrayType},
false,
true
);
utils().toSizeAfterFreeMemoryPointer();
m_context << Instruction::SHA3;
}
else
utils().convertType(
*arguments[arg - 1]->annotation().type,
*function.parameterTypes()[arg - 1],
true
);
}
if (!event.isAnonymous())
{
m_context << u256(h256::Arith(dev::sha3(function.externalSignature())));
++numIndexed;
}
solAssert(numIndexed <= 4, "Too many indexed arguments.");
// Copy all non-indexed arguments to memory (data)
// Memory position is only a hack and should be removed once we have free memory pointer.
TypePointers nonIndexedArgTypes;
TypePointers nonIndexedParamTypes;
for (unsigned arg = 0; arg < arguments.size(); ++arg)
if (!event.parameters()[arg]->isIndexed())
{
arguments[arg]->accept(*this);
nonIndexedArgTypes.push_back(arguments[arg]->annotation().type);
nonIndexedParamTypes.push_back(function.parameterTypes()[arg]);
}
utils().fetchFreeMemoryPointer();
utils().encodeToMemory(nonIndexedArgTypes, nonIndexedParamTypes);
// need: topic1 ... topicn memsize memstart
utils().toSizeAfterFreeMemoryPointer();
m_context << logInstruction(numIndexed);
break;
}
case Location::BlockHash:
{
arguments[0]->accept(*this);
utils().convertType(*arguments[0]->annotation().type, *function.parameterTypes()[0], true);
m_context << Instruction::BLOCKHASH;
break;
}
case Location::AddMod:
case Location::MulMod:
{
for (unsigned i = 0; i < 3; i ++)
{
arguments[2 - i]->accept(*this);
utils().convertType(*arguments[2 - i]->annotation().type, IntegerType(256));
}
if (function.location() == Location::AddMod)
m_context << Instruction::ADDMOD;
else
m_context << Instruction::MULMOD;
break;
}
case Location::ECRecover:
case Location::SHA256:
case Location::RIPEMD160:
{
_functionCall.expression().accept(*this);
static const map<Location, u256> contractAddresses{{Location::ECRecover, 1},
{Location::SHA256, 2},
{Location::RIPEMD160, 3}};
m_context << contractAddresses.find(function.location())->second;
for (unsigned i = function.sizeOnStack(); i > 0; --i)
m_context << swapInstruction(i);
appendExternalFunctionCall(function, arguments);
break;
}
case Location::ByteArrayPush:
case Location::ArrayPush:
{
_functionCall.expression().accept(*this);
solAssert(function.parameterTypes().size() == 1, "");
solAssert(!!function.parameterTypes()[0], "");
TypePointer paramType = function.parameterTypes()[0];
shared_ptr<ArrayType> arrayType =
function.location() == Location::ArrayPush ?
make_shared<ArrayType>(DataLocation::Storage, paramType) :
make_shared<ArrayType>(DataLocation::Storage);
// get the current length
ArrayUtils(m_context).retrieveLength(*arrayType);
m_context << Instruction::DUP1;
// stack: ArrayReference currentLength currentLength
m_context << u256(1) << Instruction::ADD;
// stack: ArrayReference currentLength newLength
m_context << Instruction::DUP3 << Instruction::DUP2;
ArrayUtils(m_context).resizeDynamicArray(*arrayType);
m_context << Instruction::SWAP2 << Instruction::SWAP1;
// stack: newLength ArrayReference oldLength
ArrayUtils(m_context).accessIndex(*arrayType, false);
// stack: newLength storageSlot slotOffset
arguments[0]->accept(*this);
// stack: newLength storageSlot slotOffset argValue
TypePointer type = arguments[0]->annotation().type->closestTemporaryType(arrayType->baseType());
utils().convertType(*arguments[0]->annotation().type, *type);
utils().moveToStackTop(1 + type->sizeOnStack());
utils().moveToStackTop(1 + type->sizeOnStack());
// stack: newLength argValue storageSlot slotOffset
if (function.location() == Location::ArrayPush)
StorageItem(m_context, *paramType).storeValue(*type, _functionCall.location(), true);
else
StorageByteArrayElement(m_context).storeValue(*type, _functionCall.location(), true);
break;
}
case Location::ObjectCreation:
{
// Will allocate at the end of memory (MSIZE) and not write at all unless the base
// type is dynamically sized.
ArrayType const& arrayType = dynamic_cast<ArrayType const&>(*_functionCall.annotation().type);
_functionCall.expression().accept(*this);
solAssert(arguments.size() == 1, "");
// Fetch requested length.
arguments[0]->accept(*this);
utils().convertType(*arguments[0]->annotation().type, IntegerType(256));
// Stack: requested_length
// Allocate at max(MSIZE, freeMemoryPointer)
utils().fetchFreeMemoryPointer();
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 << Instruction::POP;
m_context << Instruction::MSIZE;
m_context << initialise;
// Stack: requested_length memptr
m_context << Instruction::SWAP1;
// Stack: memptr requested_length
// store length
m_context << Instruction::DUP1 << Instruction::DUP3 << Instruction::MSTORE;
// Stack: memptr requested_length
// update free memory pointer
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 << Instruction::DUP2 << u256(32) << Instruction::ADD;
utils().zeroInitialiseMemoryArray(arrayType);
m_context << Instruction::POP;
}
else
m_context << Instruction::POP;
break;
}
default:
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Invalid function type."));
}
}
return false;
}
bool ExpressionCompiler::visit(NewExpression const&)
{
// code is created for the function call (CREATION) only
return false;
}
bool ExpressionCompiler::visit(MemberAccess const& _memberAccess)
{
CompilerContext::LocationSetter locationSetter(m_context, _memberAccess);
// Check whether the member is a bound function.
ASTString const& member = _memberAccess.memberName();
if (auto funType = dynamic_cast<FunctionType const*>(_memberAccess.annotation().type.get()))
if (funType->bound())
{
_memberAccess.expression().accept(*this);
utils().convertType(
*_memberAccess.expression().annotation().type,
*funType->selfType(),
true
);
if (funType->location() == FunctionType::Location::Internal)
{
m_context << m_context.functionEntryLabel(
dynamic_cast<FunctionDefinition const&>(funType->declaration())
).pushTag();
utils().moveIntoStack(funType->selfType()->sizeOnStack(), 1);
}
else
{
solAssert(funType->location() == FunctionType::Location::DelegateCall, "");
auto contract = dynamic_cast<ContractDefinition const*>(funType->declaration().scope());
solAssert(contract && contract->isLibrary(), "");
m_context.appendLibraryAddress(contract->name());
m_context << funType->externalIdentifier();
utils().moveIntoStack(funType->selfType()->sizeOnStack(), 2);
}
return false;
}
// Special processing for TypeType because we do not want to visit the library itself
// for internal functions.
if (TypeType const* type = dynamic_cast<TypeType const*>(_memberAccess.expression().annotation().type.get()))
{
if (dynamic_cast<ContractType const*>(type->actualType().get()))
{
if (auto funType = dynamic_cast<FunctionType const*>(_memberAccess.annotation().type.get()))
{
if (funType->location() != FunctionType::Location::Internal)
{
_memberAccess.expression().accept(*this);
m_context << funType->externalIdentifier();
}
else
{
// We do not visit the expression here on purpose, because in the case of an
// internal library function call, this would push the library address forcing
// us to link against it although we actually do not need it.
auto const* function = dynamic_cast<FunctionDefinition const*>(_memberAccess.annotation().referencedDeclaration);
solAssert(!!function, "Function not found in member access");
m_context << m_context.functionEntryLabel(*function).pushTag();
}
}
else
_memberAccess.expression().accept(*this);
}
else if (auto enumType = dynamic_cast<EnumType const*>(type->actualType().get()))
{
_memberAccess.expression().accept(*this);
m_context << enumType->memberValue(_memberAccess.memberName());
}
else
_memberAccess.expression().accept(*this);
return false;
}
_memberAccess.expression().accept(*this);
switch (_memberAccess.expression().annotation().type->category())
{
case Type::Category::Contract:
{
bool alsoSearchInteger = false;
ContractType const& type = dynamic_cast<ContractType const&>(*_memberAccess.expression().annotation().type);
if (type.isSuper())
{
solAssert(!!_memberAccess.annotation().referencedDeclaration, "Referenced declaration not resolved.");
m_context << m_context.superFunctionEntryLabel(
dynamic_cast<FunctionDefinition const&>(*_memberAccess.annotation().referencedDeclaration),
type.contractDefinition()
).pushTag();
}
else
{
// ordinary contract type
if (Declaration const* declaration = _memberAccess.annotation().referencedDeclaration)
{
u256 identifier;
if (auto const* variable = dynamic_cast<VariableDeclaration const*>(declaration))
identifier = FunctionType(*variable).externalIdentifier();
else if (auto const* function = dynamic_cast<FunctionDefinition const*>(declaration))
identifier = FunctionType(*function).externalIdentifier();
else
solAssert(false, "Contract member is neither variable nor function.");
utils().convertType(type, IntegerType(0, IntegerType::Modifier::Address), true);
m_context << identifier;
}
else
// not found in contract, search in members inherited from address
alsoSearchInteger = true;
}
if (!alsoSearchInteger)
break;
}
case Type::Category::Integer:
if (member == "balance")
{
utils().convertType(
*_memberAccess.expression().annotation().type,
IntegerType(0, IntegerType::Modifier::Address),
true
);
m_context << Instruction::BALANCE;
}
else if ((set<string>{"send", "call", "callcode", "delegatecall"}).count(member))
utils().convertType(
*_memberAccess.expression().annotation().type,
IntegerType(0, IntegerType::Modifier::Address),
true
);
else
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Invalid member access to integer."));
break;
case Type::Category::Function:
solAssert(!!_memberAccess.expression().annotation().type->memberType(member),
"Invalid member access to function.");
break;
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 << Instruction::COINBASE;
else if (member == "timestamp")
m_context << Instruction::TIMESTAMP;
else if (member == "difficulty")
m_context << Instruction::DIFFICULTY;
else if (member == "number")
m_context << Instruction::NUMBER;
else if (member == "gaslimit")
m_context << Instruction::GASLIMIT;
else if (member == "sender")
m_context << Instruction::CALLER;
else if (member == "value")
m_context << Instruction::CALLVALUE;
else if (member == "origin")
m_context << Instruction::ORIGIN;
else if (member == "gas")
m_context << Instruction::GAS;
else if (member == "gasprice")
m_context << Instruction::GASPRICE;
else if (member == "data")
m_context << u256(0) << Instruction::CALLDATASIZE;
else if (member == "sig")
m_context << u256(0) << Instruction::CALLDATALOAD
<< (u256(0xffffffff) << (256 - 32)) << Instruction::AND;
else
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown magic member."));
break;
case Type::Category::Struct:
{
StructType const& type = dynamic_cast<StructType const&>(*_memberAccess.expression().annotation().type);
switch (type.location())
{
case DataLocation::Storage:
{
pair<u256, unsigned> const& offsets = type.storageOffsetsOfMember(member);
m_context << offsets.first << Instruction::ADD << u256(offsets.second);
setLValueToStorageItem(_memberAccess);
break;
}
case DataLocation::Memory:
{
m_context << type.memoryOffsetOfMember(member) << Instruction::ADD;
setLValue<MemoryItem>(_memberAccess, *_memberAccess.annotation().type);
break;
}
default:
solAssert(false, "Illegal data location for struct.");
}
break;
}