mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
1731 lines
60 KiB
C++
1731 lines
60 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2014
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* Solidity AST to EVM bytecode compiler for expressions.
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*/
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#include <utility>
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#include <numeric>
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#include <boost/range/adaptor/reversed.hpp>
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#include <boost/algorithm/string/replace.hpp>
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#include <libdevcore/Common.h>
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#include <libdevcore/SHA3.h>
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#include <libsolidity/ast/AST.h>
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#include <libsolidity/codegen/ExpressionCompiler.h>
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#include <libsolidity/codegen/CompilerContext.h>
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#include <libsolidity/codegen/CompilerUtils.h>
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#include <libsolidity/codegen/LValue.h>
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#include <libevmasm/GasMeter.h>
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using namespace std;
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namespace dev
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{
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namespace solidity
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{
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void ExpressionCompiler::compile(Expression const& _expression)
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{
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_expression.accept(*this);
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}
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void ExpressionCompiler::appendStateVariableInitialization(VariableDeclaration const& _varDecl)
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{
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if (!_varDecl.value())
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return;
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TypePointer type = _varDecl.value()->annotation().type;
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solAssert(!!type, "Type information not available.");
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CompilerContext::LocationSetter locationSetter(m_context, _varDecl);
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_varDecl.value()->accept(*this);
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if (_varDecl.annotation().type->dataStoredIn(DataLocation::Storage))
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{
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// reference type, only convert value to mobile type and do final conversion in storeValue.
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auto mt = type->mobileType();
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solAssert(mt, "");
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utils().convertType(*type, *mt);
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type = mt;
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}
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else
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{
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utils().convertType(*type, *_varDecl.annotation().type);
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type = _varDecl.annotation().type;
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}
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StorageItem(m_context, _varDecl).storeValue(*type, _varDecl.location(), true);
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}
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void ExpressionCompiler::appendConstStateVariableAccessor(VariableDeclaration const& _varDecl)
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{
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solAssert(_varDecl.isConstant(), "");
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_varDecl.value()->accept(*this);
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utils().convertType(*_varDecl.value()->annotation().type, *_varDecl.annotation().type);
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// append return
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m_context << dupInstruction(_varDecl.annotation().type->sizeOnStack() + 1);
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m_context.appendJump(eth::AssemblyItem::JumpType::OutOfFunction);
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}
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void ExpressionCompiler::appendStateVariableAccessor(VariableDeclaration const& _varDecl)
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{
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solAssert(!_varDecl.isConstant(), "");
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CompilerContext::LocationSetter locationSetter(m_context, _varDecl);
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FunctionType accessorType(_varDecl);
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TypePointers paramTypes = accessorType.parameterTypes();
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// retrieve the position of the variable
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auto const& location = m_context.storageLocationOfVariable(_varDecl);
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m_context << location.first << u256(location.second);
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TypePointer returnType = _varDecl.annotation().type;
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for (size_t i = 0; i < paramTypes.size(); ++i)
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{
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if (auto mappingType = dynamic_cast<MappingType const*>(returnType.get()))
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{
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solAssert(CompilerUtils::freeMemoryPointer >= 0x40, "");
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solUnimplementedAssert(
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!paramTypes[i]->isDynamicallySized(),
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"Accessors for mapping with dynamically-sized keys not yet implemented."
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);
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// pop offset
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m_context << Instruction::POP;
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// move storage offset to memory.
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utils().storeInMemory(32);
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// move key to memory.
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utils().copyToStackTop(paramTypes.size() - i, 1);
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utils().storeInMemory(0);
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m_context << u256(64) << u256(0) << Instruction::SHA3;
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// push offset
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m_context << u256(0);
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returnType = mappingType->valueType();
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}
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else if (auto arrayType = dynamic_cast<ArrayType const*>(returnType.get()))
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{
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// pop offset
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m_context << Instruction::POP;
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utils().copyToStackTop(paramTypes.size() - i + 1, 1);
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ArrayUtils(m_context).accessIndex(*arrayType);
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returnType = arrayType->baseType();
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}
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else
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solAssert(false, "Index access is allowed only for \"mapping\" and \"array\" types.");
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}
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// remove index arguments.
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if (paramTypes.size() == 1)
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m_context << Instruction::SWAP2 << Instruction::POP << Instruction::SWAP1;
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else if (paramTypes.size() >= 2)
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{
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m_context << swapInstruction(paramTypes.size());
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m_context << Instruction::POP;
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m_context << swapInstruction(paramTypes.size());
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utils().popStackSlots(paramTypes.size() - 1);
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}
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unsigned retSizeOnStack = 0;
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solAssert(accessorType.returnParameterTypes().size() >= 1, "");
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auto const& returnTypes = accessorType.returnParameterTypes();
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if (StructType const* structType = dynamic_cast<StructType const*>(returnType.get()))
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{
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// remove offset
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m_context << Instruction::POP;
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auto const& names = accessorType.returnParameterNames();
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// struct
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for (size_t i = 0; i < names.size(); ++i)
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{
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if (returnTypes[i]->category() == Type::Category::Mapping)
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continue;
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if (auto arrayType = dynamic_cast<ArrayType const*>(returnTypes[i].get()))
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if (!arrayType->isByteArray())
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continue;
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pair<u256, unsigned> const& offsets = structType->storageOffsetsOfMember(names[i]);
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m_context << Instruction::DUP1 << u256(offsets.first) << Instruction::ADD << u256(offsets.second);
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TypePointer memberType = structType->memberType(names[i]);
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StorageItem(m_context, *memberType).retrieveValue(SourceLocation(), true);
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utils().convertType(*memberType, *returnTypes[i]);
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utils().moveToStackTop(returnTypes[i]->sizeOnStack());
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retSizeOnStack += returnTypes[i]->sizeOnStack();
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}
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// remove slot
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m_context << Instruction::POP;
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}
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else
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{
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// simple value or array
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solAssert(returnTypes.size() == 1, "");
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StorageItem(m_context, *returnType).retrieveValue(SourceLocation(), true);
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utils().convertType(*returnType, *returnTypes.front());
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retSizeOnStack = returnTypes.front()->sizeOnStack();
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}
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solAssert(retSizeOnStack == utils().sizeOnStack(returnTypes), "");
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solAssert(retSizeOnStack <= 15, "Stack is too deep.");
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m_context << dupInstruction(retSizeOnStack + 1);
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m_context.appendJump(eth::AssemblyItem::JumpType::OutOfFunction);
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}
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bool ExpressionCompiler::visit(Conditional const& _condition)
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{
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CompilerContext::LocationSetter locationSetter(m_context, _condition);
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_condition.condition().accept(*this);
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eth::AssemblyItem trueTag = m_context.appendConditionalJump();
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_condition.falseExpression().accept(*this);
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utils().convertType(*_condition.falseExpression().annotation().type, *_condition.annotation().type);
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eth::AssemblyItem endTag = m_context.appendJumpToNew();
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m_context << trueTag;
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int offset = _condition.annotation().type->sizeOnStack();
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m_context.adjustStackOffset(-offset);
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_condition.trueExpression().accept(*this);
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utils().convertType(*_condition.trueExpression().annotation().type, *_condition.annotation().type);
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m_context << endTag;
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return false;
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}
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bool ExpressionCompiler::visit(Assignment const& _assignment)
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{
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CompilerContext::LocationSetter locationSetter(m_context, _assignment);
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_assignment.rightHandSide().accept(*this);
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// Perform some conversion already. This will convert storage types to memory and literals
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// to their actual type, but will not convert e.g. memory to storage.
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TypePointer type = _assignment.rightHandSide().annotation().type->closestTemporaryType(
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_assignment.leftHandSide().annotation().type
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);
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utils().convertType(*_assignment.rightHandSide().annotation().type, *type);
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_assignment.leftHandSide().accept(*this);
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solAssert(!!m_currentLValue, "LValue not retrieved.");
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Token::Value op = _assignment.assignmentOperator();
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if (op != Token::Assign) // compound assignment
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{
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Token::Value target_op = Token::AssignmentToBinaryOp(op);
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solUnimplementedAssert(_assignment.annotation().type->isValueType(), "Compound operators not implemented for non-value types.");
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unsigned lvalueSize = m_currentLValue->sizeOnStack();
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unsigned itemSize = _assignment.annotation().type->sizeOnStack();
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if (lvalueSize > 0)
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{
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utils().copyToStackTop(lvalueSize + itemSize, itemSize);
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utils().copyToStackTop(itemSize + lvalueSize, lvalueSize);
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// value lvalue_ref value lvalue_ref
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}
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m_currentLValue->retrieveValue(_assignment.location(), true);
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if (Token::isShiftOp(target_op))
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// shift only cares about the signedness of both sides
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appendShiftOperatorCode(target_op, *_assignment.leftHandSide().annotation().type, *_assignment.rightHandSide().annotation().type);
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else
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appendOrdinaryBinaryOperatorCode(target_op, *_assignment.annotation().type);
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if (lvalueSize > 0)
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{
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solAssert(itemSize + lvalueSize <= 16, "Stack too deep, try removing local variables.");
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// value [lvalue_ref] updated_value
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for (unsigned i = 0; i < itemSize; ++i)
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m_context << swapInstruction(itemSize + lvalueSize) << Instruction::POP;
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}
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}
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m_currentLValue->storeValue(*type, _assignment.location());
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m_currentLValue.reset();
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return false;
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}
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bool ExpressionCompiler::visit(TupleExpression const& _tuple)
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{
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if (_tuple.isInlineArray())
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{
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ArrayType const& arrayType = dynamic_cast<ArrayType const&>(*_tuple.annotation().type);
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solAssert(!arrayType.isDynamicallySized(), "Cannot create dynamically sized inline array.");
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m_context << max(u256(32u), arrayType.memorySize());
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utils().allocateMemory();
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m_context << Instruction::DUP1;
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for (auto const& component: _tuple.components())
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{
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component->accept(*this);
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utils().convertType(*component->annotation().type, *arrayType.baseType(), true);
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utils().storeInMemoryDynamic(*arrayType.baseType(), true);
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}
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m_context << Instruction::POP;
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}
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else
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{
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vector<unique_ptr<LValue>> lvalues;
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for (auto const& component: _tuple.components())
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if (component)
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{
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component->accept(*this);
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if (_tuple.annotation().lValueRequested)
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{
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solAssert(!!m_currentLValue, "");
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lvalues.push_back(move(m_currentLValue));
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}
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}
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else if (_tuple.annotation().lValueRequested)
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lvalues.push_back(unique_ptr<LValue>());
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if (_tuple.annotation().lValueRequested)
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{
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if (_tuple.components().size() == 1)
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m_currentLValue = move(lvalues[0]);
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else
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m_currentLValue.reset(new TupleObject(m_context, move(lvalues)));
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}
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}
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return false;
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}
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bool ExpressionCompiler::visit(UnaryOperation const& _unaryOperation)
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{
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CompilerContext::LocationSetter locationSetter(m_context, _unaryOperation);
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if (_unaryOperation.annotation().type->category() == Type::Category::RationalNumber)
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{
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m_context << _unaryOperation.annotation().type->literalValue(nullptr);
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return false;
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}
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_unaryOperation.subExpression().accept(*this);
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switch (_unaryOperation.getOperator())
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{
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case Token::Not: // !
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m_context << Instruction::ISZERO;
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break;
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case Token::BitNot: // ~
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m_context << Instruction::NOT;
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break;
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case Token::Delete: // delete
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solAssert(!!m_currentLValue, "LValue not retrieved.");
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m_currentLValue->setToZero(_unaryOperation.location());
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m_currentLValue.reset();
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break;
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case Token::Inc: // ++ (pre- or postfix)
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case Token::Dec: // -- (pre- or postfix)
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solAssert(!!m_currentLValue, "LValue not retrieved.");
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m_currentLValue->retrieveValue(_unaryOperation.location());
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if (!_unaryOperation.isPrefixOperation())
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{
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// store value for later
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solUnimplementedAssert(_unaryOperation.annotation().type->sizeOnStack() == 1, "Stack size != 1 not implemented.");
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m_context << Instruction::DUP1;
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if (m_currentLValue->sizeOnStack() > 0)
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for (unsigned i = 1 + m_currentLValue->sizeOnStack(); i > 0; --i)
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m_context << swapInstruction(i);
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}
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m_context << u256(1);
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if (_unaryOperation.getOperator() == Token::Inc)
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m_context << Instruction::ADD;
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else
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m_context << Instruction::SWAP1 << Instruction::SUB;
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// Stack for prefix: [ref...] (*ref)+-1
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// Stack for postfix: *ref [ref...] (*ref)+-1
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for (unsigned i = m_currentLValue->sizeOnStack(); i > 0; --i)
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m_context << swapInstruction(i);
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m_currentLValue->storeValue(
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*_unaryOperation.annotation().type, _unaryOperation.location(),
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!_unaryOperation.isPrefixOperation());
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m_currentLValue.reset();
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break;
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case Token::Add: // +
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// unary add, so basically no-op
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break;
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case Token::Sub: // -
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m_context << u256(0) << Instruction::SUB;
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break;
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default:
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BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Invalid unary operator: " +
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string(Token::toString(_unaryOperation.getOperator()))));
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}
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return false;
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}
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bool ExpressionCompiler::visit(BinaryOperation const& _binaryOperation)
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{
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CompilerContext::LocationSetter locationSetter(m_context, _binaryOperation);
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Expression const& leftExpression = _binaryOperation.leftExpression();
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Expression const& rightExpression = _binaryOperation.rightExpression();
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solAssert(!!_binaryOperation.annotation().commonType, "");
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Type const& commonType = *_binaryOperation.annotation().commonType;
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Token::Value const c_op = _binaryOperation.getOperator();
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if (c_op == Token::And || c_op == Token::Or) // special case: short-circuiting
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appendAndOrOperatorCode(_binaryOperation);
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else if (commonType.category() == Type::Category::RationalNumber)
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m_context << commonType.literalValue(nullptr);
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else
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{
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bool cleanupNeeded = false;
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if (Token::isCompareOp(c_op) || Token::isShiftOp(c_op))
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cleanupNeeded = true;
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if (commonType.category() == Type::Category::Integer && (c_op == Token::Div || c_op == Token::Mod))
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cleanupNeeded = true;
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// for commutative operators, push the literal as late as possible to allow improved optimization
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auto isLiteral = [](Expression const& _e)
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{
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return dynamic_cast<Literal const*>(&_e) || _e.annotation().type->category() == Type::Category::RationalNumber;
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};
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bool swap = m_optimize && Token::isCommutativeOp(c_op) && isLiteral(rightExpression) && !isLiteral(leftExpression);
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if (swap)
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{
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leftExpression.accept(*this);
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utils().convertType(*leftExpression.annotation().type, commonType, cleanupNeeded);
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rightExpression.accept(*this);
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utils().convertType(*rightExpression.annotation().type, commonType, cleanupNeeded);
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}
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else
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{
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rightExpression.accept(*this);
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utils().convertType(*rightExpression.annotation().type, commonType, cleanupNeeded);
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leftExpression.accept(*this);
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utils().convertType(*leftExpression.annotation().type, commonType, cleanupNeeded);
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}
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if (Token::isShiftOp(c_op))
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// shift only cares about the signedness of both sides
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appendShiftOperatorCode(c_op, *leftExpression.annotation().type, *rightExpression.annotation().type);
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else if (Token::isCompareOp(c_op))
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appendCompareOperatorCode(c_op, commonType);
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else
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appendOrdinaryBinaryOperatorCode(c_op, commonType);
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}
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// do not visit the child nodes, we already did that explicitly
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return false;
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}
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bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
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{
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CompilerContext::LocationSetter locationSetter(m_context, _functionCall);
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using Location = FunctionType::Location;
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if (_functionCall.annotation().isTypeConversion)
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{
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solAssert(_functionCall.arguments().size() == 1, "");
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solAssert(_functionCall.names().empty(), "");
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Expression const& firstArgument = *_functionCall.arguments().front();
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firstArgument.accept(*this);
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utils().convertType(*firstArgument.annotation().type, *_functionCall.annotation().type);
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return false;
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}
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FunctionTypePointer functionType;
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if (_functionCall.annotation().isStructConstructorCall)
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{
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auto const& type = dynamic_cast<TypeType const&>(*_functionCall.expression().annotation().type);
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auto const& structType = dynamic_cast<StructType const&>(*type.actualType());
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functionType = structType.constructorType();
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}
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else
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functionType = dynamic_pointer_cast<FunctionType const>(_functionCall.expression().annotation().type);
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TypePointers parameterTypes = functionType->parameterTypes();
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vector<ASTPointer<Expression const>> const& callArguments = _functionCall.arguments();
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vector<ASTPointer<ASTString>> const& callArgumentNames = _functionCall.names();
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if (!functionType->takesArbitraryParameters())
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solAssert(callArguments.size() == parameterTypes.size(), "");
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vector<ASTPointer<Expression const>> arguments;
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if (callArgumentNames.empty())
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// normal arguments
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arguments = callArguments;
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else
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// named arguments
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for (auto const& parameterName: functionType->parameterNames())
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{
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bool found = false;
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for (size_t j = 0; j < callArgumentNames.size() && !found; j++)
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if ((found = (parameterName == *callArgumentNames[j])))
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// we found the actual parameter position
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arguments.push_back(callArguments[j]);
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solAssert(found, "");
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}
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if (_functionCall.annotation().isStructConstructorCall)
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{
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TypeType const& type = dynamic_cast<TypeType const&>(*_functionCall.expression().annotation().type);
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auto const& structType = dynamic_cast<StructType const&>(*type.actualType());
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m_context << max(u256(32u), structType.memorySize());
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utils().allocateMemory();
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m_context << Instruction::DUP1;
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for (unsigned i = 0; i < arguments.size(); ++i)
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{
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arguments[i]->accept(*this);
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utils().convertType(*arguments[i]->annotation().type, *functionType->parameterTypes()[i]);
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utils().storeInMemoryDynamic(*functionType->parameterTypes()[i]);
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}
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m_context << Instruction::POP;
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}
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else
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{
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FunctionType const& function = *functionType;
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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();
|
|
}
|
|
|
|
if (m_context.runtimeContext())
|
|
// We have a runtime context, so we need the creation part.
|
|
m_context << (u256(1) << 32) << Instruction::SWAP1 << Instruction::DIV;
|
|
else
|
|
// Extract the runtime part.
|
|
m_context << ((u256(1) << 32) - 1) << Instruction::AND;
|
|
|
|
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();
|
|
// TODO we create a copy here, which is actually what we want.
|
|
// This should be revisited at the point where we fix
|
|
// https://github.com/ethereum/solidity/issues/1092
|
|
// pushes size
|
|
auto subroutine = m_context.addSubroutine(make_shared<eth::Assembly>(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;
|
|
// Check if zero (out of stack or not enough balance).
|
|
m_context << Instruction::DUP1 << Instruction::ISZERO;
|
|
m_context.appendConditionalJumpTo(m_context.errorTag());
|
|
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);
|
|
// Provide the gas stipend manually at first because we may send zero ether.
|
|
// Will be zeroed if we send more than zero ether.
|
|
m_context << u256(eth::GasCosts::callStipend);
|
|
arguments.front()->accept(*this);
|
|
utils().convertType(
|
|
*arguments.front()->annotation().type,
|
|
*function.parameterTypes().front(), true
|
|
);
|
|
// gas <- gas * !value
|
|
m_context << Instruction::SWAP1 << Instruction::DUP2;
|
|
m_context << Instruction::ISZERO << Instruction::MUL << Instruction::SWAP1;
|
|
appendExternalFunctionCall(
|
|
FunctionType(
|
|
TypePointers{},
|
|
TypePointers{},
|
|
strings(),
|
|
strings(),
|
|
Location::Bare,
|
|
false,
|
|
nullptr,
|
|
false,
|
|
false,
|
|
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::keccak256(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
|
|
|
|
// Check if length is zero
|
|
m_context << Instruction::DUP1 << Instruction::ISZERO;
|
|
auto skipInit = m_context.appendConditionalJump();
|
|
|
|
// 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 << skipInit;
|
|
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)
|
|
{
|
|
FunctionDefinition const& funDef = dynamic_cast<decltype(funDef)>(funType->declaration());
|
|
utils().pushCombinedFunctionEntryLabel(funDef);
|
|
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, or enum/struct definitions.
|
|
if (TypeType const* type = dynamic_cast<TypeType const*>(_memberAccess.expression().annotation().type.get()))
|
|
{
|
|
if (dynamic_cast<ContractType const*>(type->actualType().get()))
|
|
{
|
|
solAssert(_memberAccess.annotation().type, "_memberAccess has no type");
|
|
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");
|
|
utils().pushCombinedFunctionEntryLabel(*function);
|
|
}
|
|
}
|
|
else if (dynamic_cast<TypeType const*>(_memberAccess.annotation().type.get()))
|
|
{
|
|
// no-op
|
|
}
|
|
else if (auto variable = dynamic_cast<VariableDeclaration const*>(_memberAccess.annotation().referencedDeclaration))
|
|
appendVariable(*variable, static_cast<Expression const&>(_memberAccess));
|
|
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.");
|
|
utils().pushCombinedFunctionEntryLabel(m_context.superFunction(
|
|
dynamic_cast<FunctionDefinition const&>(*_memberAccess.annotation().referencedDeclaration),
|
|
type.contractDefinition()
|
|
));
|
|
}
|
|
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;
|
|
}
|
|
case Type::Category::Enum:
|
|
{
|
|
EnumType const& type = dynamic_cast<EnumType const&>(*_memberAccess.expression().annotation().type);
|
|
m_context << type.memberValue(_memberAccess.memberName());
|
|
break;
|
|
}
|
|
case Type::Category::Array:
|
|
{
|
|
auto const& type = dynamic_cast<ArrayType const&>(*_memberAccess.expression().annotation().type);
|
|
if (member == "length")
|
|
{
|
|
if (!type.isDynamicallySized())
|
|
{
|
|
utils().popStackElement(type);
|
|
m_context << type.length();
|
|
}
|
|
else
|
|
switch (type.location())
|
|
{
|
|
case DataLocation::CallData:
|
|
m_context << Instruction::SWAP1 << Instruction::POP;
|
|
break;
|
|
case DataLocation::Storage:
|
|
setLValue<StorageArrayLength>(_memberAccess, type);
|
|
break;
|
|
case DataLocation::Memory:
|
|
m_context << Instruction::MLOAD;
|
|
break;
|
|
}
|
|
}
|
|
else if (member == "push")
|
|
{
|
|
solAssert(
|
|
type.isDynamicallySized() && type.location() == DataLocation::Storage,
|
|
"Tried to use .push() on a non-dynamically sized array"
|
|
);
|
|
}
|
|
else
|
|
solAssert(false, "Illegal array member.");
|
|
break;
|
|
}
|
|
case Type::Category::FixedBytes:
|
|
{
|
|
auto const& type = dynamic_cast<FixedBytesType const&>(*_memberAccess.expression().annotation().type);
|
|
utils().popStackElement(type);
|
|
if (member == "length")
|
|
m_context << u256(type.numBytes());
|
|
else
|
|
solAssert(false, "Illegal fixed bytes member.");
|
|
break;
|
|
}
|
|
default:
|
|
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Member access to unknown type."));
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool ExpressionCompiler::visit(IndexAccess const& _indexAccess)
|
|
{
|
|
CompilerContext::LocationSetter locationSetter(m_context, _indexAccess);
|
|
_indexAccess.baseExpression().accept(*this);
|
|
|
|
Type const& baseType = *_indexAccess.baseExpression().annotation().type;
|
|
|
|
if (baseType.category() == Type::Category::Mapping)
|
|
{
|
|
// stack: storage_base_ref
|
|
TypePointer keyType = dynamic_cast<MappingType const&>(baseType).keyType();
|
|
solAssert(_indexAccess.indexExpression(), "Index expression expected.");
|
|
if (keyType->isDynamicallySized())
|
|
{
|
|
_indexAccess.indexExpression()->accept(*this);
|
|
utils().fetchFreeMemoryPointer();
|
|
// stack: base index mem
|
|
// note: the following operations must not allocate memory!
|
|
utils().encodeToMemory(
|
|
TypePointers{_indexAccess.indexExpression()->annotation().type},
|
|
TypePointers{keyType},
|
|
false,
|
|
true
|
|
);
|
|
m_context << Instruction::SWAP1;
|
|
utils().storeInMemoryDynamic(IntegerType(256));
|
|
utils().toSizeAfterFreeMemoryPointer();
|
|
}
|
|
else
|
|
{
|
|
m_context << u256(0); // memory position
|
|
appendExpressionCopyToMemory(*keyType, *_indexAccess.indexExpression());
|
|
m_context << Instruction::SWAP1;
|
|
solAssert(CompilerUtils::freeMemoryPointer >= 0x40, "");
|
|
utils().storeInMemoryDynamic(IntegerType(256));
|
|
m_context << u256(0);
|
|
}
|
|
m_context << Instruction::SHA3;
|
|
m_context << u256(0);
|
|
setLValueToStorageItem(_indexAccess);
|
|
}
|
|
else if (baseType.category() == Type::Category::Array)
|
|
{
|
|
ArrayType const& arrayType = dynamic_cast<ArrayType const&>(baseType);
|
|
solAssert(_indexAccess.indexExpression(), "Index expression expected.");
|
|
|
|
_indexAccess.indexExpression()->accept(*this);
|
|
utils().convertType(*_indexAccess.indexExpression()->annotation().type, IntegerType(256), true);
|
|
// stack layout: <base_ref> [<length>] <index>
|
|
ArrayUtils(m_context).accessIndex(arrayType);
|
|
switch (arrayType.location())
|
|
{
|
|
case DataLocation::Storage:
|
|
if (arrayType.isByteArray())
|
|
{
|
|
solAssert(!arrayType.isString(), "Index access to string is not allowed.");
|
|
setLValue<StorageByteArrayElement>(_indexAccess);
|
|
}
|
|
else
|
|
setLValueToStorageItem(_indexAccess);
|
|
break;
|
|
case DataLocation::Memory:
|
|
setLValue<MemoryItem>(_indexAccess, *_indexAccess.annotation().type, !arrayType.isByteArray());
|
|
break;
|
|
case DataLocation::CallData:
|
|
//@todo if we implement this, the value in calldata has to be added to the base offset
|
|
solUnimplementedAssert(!arrayType.baseType()->isDynamicallySized(), "Nested arrays not yet implemented.");
|
|
if (arrayType.baseType()->isValueType())
|
|
CompilerUtils(m_context).loadFromMemoryDynamic(
|
|
*arrayType.baseType(),
|
|
true,
|
|
!arrayType.isByteArray(),
|
|
false
|
|
);
|
|
break;
|
|
}
|
|
}
|
|
else if (baseType.category() == Type::Category::FixedBytes)
|
|
{
|
|
FixedBytesType const& fixedBytesType = dynamic_cast<FixedBytesType const&>(baseType);
|
|
solAssert(_indexAccess.indexExpression(), "Index expression expected.");
|
|
|
|
_indexAccess.indexExpression()->accept(*this);
|
|
utils().convertType(*_indexAccess.indexExpression()->annotation().type, IntegerType(256), true);
|
|
// stack layout: <value> <index>
|
|
// check out-of-bounds access
|
|
m_context << u256(fixedBytesType.numBytes());
|
|
m_context << Instruction::DUP2 << Instruction::LT << Instruction::ISZERO;
|
|
// out-of-bounds access throws exception
|
|
m_context.appendConditionalJumpTo(m_context.errorTag());
|
|
|
|
m_context << Instruction::BYTE;
|
|
m_context << (u256(1) << (256 - 8)) << Instruction::MUL;
|
|
}
|
|
else if (baseType.category() == Type::Category::TypeType)
|
|
{
|
|
solAssert(baseType.sizeOnStack() == 0, "");
|
|
solAssert(_indexAccess.annotation().type->sizeOnStack() == 0, "");
|
|
// no-op - this seems to be a lone array type (`structType[];`)
|
|
}
|
|
else
|
|
solAssert(false, "Index access only allowed for mappings or arrays.");
|
|
|
|
return false;
|
|
}
|
|
|
|
void ExpressionCompiler::endVisit(Identifier const& _identifier)
|
|
{
|
|
CompilerContext::LocationSetter locationSetter(m_context, _identifier);
|
|
Declaration const* declaration = _identifier.annotation().referencedDeclaration;
|
|
if (MagicVariableDeclaration const* magicVar = dynamic_cast<MagicVariableDeclaration const*>(declaration))
|
|
{
|
|
switch (magicVar->type()->category())
|
|
{
|
|
case Type::Category::Contract:
|
|
// "this" or "super"
|
|
if (!dynamic_cast<ContractType const&>(*magicVar->type()).isSuper())
|
|
m_context << Instruction::ADDRESS;
|
|
break;
|
|
case Type::Category::Integer:
|
|
// "now"
|
|
m_context << Instruction::TIMESTAMP;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
else if (FunctionDefinition const* functionDef = dynamic_cast<FunctionDefinition const*>(declaration))
|
|
utils().pushCombinedFunctionEntryLabel(m_context.resolveVirtualFunction(*functionDef));
|
|
else if (auto variable = dynamic_cast<VariableDeclaration const*>(declaration))
|
|
appendVariable(*variable, static_cast<Expression const&>(_identifier));
|
|
else if (auto contract = dynamic_cast<ContractDefinition const*>(declaration))
|
|
{
|
|
if (contract->isLibrary())
|
|
m_context.appendLibraryAddress(contract->name());
|
|
}
|
|
else if (dynamic_cast<EventDefinition const*>(declaration))
|
|
{
|
|
// no-op
|
|
}
|
|
else if (dynamic_cast<EnumDefinition const*>(declaration))
|
|
{
|
|
// no-op
|
|
}
|
|
else if (dynamic_cast<StructDefinition const*>(declaration))
|
|
{
|
|
// no-op
|
|
}
|
|
else
|
|
{
|
|
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Identifier type not expected in expression context."));
|
|
}
|
|
}
|
|
|
|
void ExpressionCompiler::endVisit(Literal const& _literal)
|
|
{
|
|
CompilerContext::LocationSetter locationSetter(m_context, _literal);
|
|
TypePointer type = _literal.annotation().type;
|
|
|
|
switch (type->category())
|
|
{
|
|
case Type::Category::RationalNumber:
|
|
case Type::Category::Bool:
|
|
m_context << type->literalValue(&_literal);
|
|
break;
|
|
case Type::Category::StringLiteral:
|
|
break; // will be done during conversion
|
|
default:
|
|
solUnimplemented("Only integer, boolean and string literals implemented for now.");
|
|
}
|
|
}
|
|
|
|
void ExpressionCompiler::appendAndOrOperatorCode(BinaryOperation const& _binaryOperation)
|
|
{
|
|
Token::Value const c_op = _binaryOperation.getOperator();
|
|
solAssert(c_op == Token::Or || c_op == Token::And, "");
|
|
|
|
_binaryOperation.leftExpression().accept(*this);
|
|
m_context << Instruction::DUP1;
|
|
if (c_op == Token::And)
|
|
m_context << Instruction::ISZERO;
|
|
eth::AssemblyItem endLabel = m_context.appendConditionalJump();
|
|
m_context << Instruction::POP;
|
|
_binaryOperation.rightExpression().accept(*this);
|
|
m_context << endLabel;
|
|
}
|
|
|
|
void ExpressionCompiler::appendCompareOperatorCode(Token::Value _operator, Type const& _type)
|
|
{
|
|
if (_operator == Token::Equal || _operator == Token::NotEqual)
|
|
{
|
|
if (FunctionType const* funType = dynamic_cast<decltype(funType)>(&_type))
|
|
{
|
|
if (funType->location() == FunctionType::Location::Internal)
|
|
{
|
|
// We have to remove the upper bits (construction time value) because they might
|
|
// be "unknown" in one of the operands and not in the other.
|
|
m_context << ((u256(1) << 32) - 1) << Instruction::AND;
|
|
m_context << Instruction::SWAP1;
|
|
m_context << ((u256(1) << 32) - 1) << Instruction::AND;
|
|
}
|
|
}
|
|
m_context << Instruction::EQ;
|
|
if (_operator == Token::NotEqual)
|
|
m_context << Instruction::ISZERO;
|
|
}
|
|
else
|
|
{
|
|
bool isSigned = false;
|
|
if (auto type = dynamic_cast<IntegerType const*>(&_type))
|
|
isSigned = type->isSigned();
|
|
|
|
switch (_operator)
|
|
{
|
|
case Token::GreaterThanOrEqual:
|
|
m_context <<
|
|
(isSigned ? Instruction::SLT : Instruction::LT) <<
|
|
Instruction::ISZERO;
|
|
break;
|
|
case Token::LessThanOrEqual:
|
|
m_context <<
|
|
(isSigned ? Instruction::SGT : Instruction::GT) <<
|
|
Instruction::ISZERO;
|
|
break;
|
|
case Token::GreaterThan:
|
|
m_context << (isSigned ? Instruction::SGT : Instruction::GT);
|
|
break;
|
|
case Token::LessThan:
|
|
m_context << (isSigned ? Instruction::SLT : Instruction::LT);
|
|
break;
|
|
default:
|
|
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown comparison operator."));
|
|
}
|
|
}
|
|
}
|
|
|
|
void ExpressionCompiler::appendOrdinaryBinaryOperatorCode(Token::Value _operator, Type const& _type)
|
|
{
|
|
if (Token::isArithmeticOp(_operator))
|
|
appendArithmeticOperatorCode(_operator, _type);
|
|
else if (Token::isBitOp(_operator))
|
|
appendBitOperatorCode(_operator);
|
|
else
|
|
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown binary operator."));
|
|
}
|
|
|
|
void ExpressionCompiler::appendArithmeticOperatorCode(Token::Value _operator, Type const& _type)
|
|
{
|
|
IntegerType const& type = dynamic_cast<IntegerType const&>(_type);
|
|
bool const c_isSigned = type.isSigned();
|
|
|
|
if (_type.category() == Type::Category::FixedPoint)
|
|
solUnimplemented("Not yet implemented - FixedPointType.");
|
|
|
|
switch (_operator)
|
|
{
|
|
case Token::Add:
|
|
m_context << Instruction::ADD;
|
|
break;
|
|
case Token::Sub:
|
|
m_context << Instruction::SUB;
|
|
break;
|
|
case Token::Mul:
|
|
m_context << Instruction::MUL;
|
|
break;
|
|
case Token::Div:
|
|
case Token::Mod:
|
|
{
|
|
// Test for division by zero
|
|
m_context << Instruction::DUP2 << Instruction::ISZERO;
|
|
m_context.appendConditionalJumpTo(m_context.errorTag());
|
|
|
|
if (_operator == Token::Div)
|
|
m_context << (c_isSigned ? Instruction::SDIV : Instruction::DIV);
|
|
else
|
|
m_context << (c_isSigned ? Instruction::SMOD : Instruction::MOD);
|
|
break;
|
|
}
|
|
case Token::Exp:
|
|
m_context << Instruction::EXP;
|
|
break;
|
|
default:
|
|
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown arithmetic operator."));
|
|
}
|
|
}
|
|
|
|
void ExpressionCompiler::appendBitOperatorCode(Token::Value _operator)
|
|
{
|
|
switch (_operator)
|
|
{
|
|
case Token::BitOr:
|
|
m_context << Instruction::OR;
|
|
break;
|
|
case Token::BitAnd:
|
|
m_context << Instruction::AND;
|
|
break;
|
|
case Token::BitXor:
|
|
m_context << Instruction::XOR;
|
|
break;
|
|
default:
|
|
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown bit operator."));
|
|
}
|
|
}
|
|
|
|
void ExpressionCompiler::appendShiftOperatorCode(Token::Value _operator, Type const& _leftType, Type const& _rightType)
|
|
{
|
|
// stack: rvalue lvalue
|
|
|
|
bool c_leftSigned = false;
|
|
if (auto leftType = dynamic_cast<IntegerType const*>(&_leftType))
|
|
c_leftSigned = leftType->isSigned();
|
|
else
|
|
solUnimplemented("Only IntegerType can be shifted.");
|
|
|
|
// The RValue can be a RationalNumberType too.
|
|
bool c_rightSigned = false;
|
|
if (auto rightType = dynamic_cast<RationalNumberType const*>(&_rightType))
|
|
{
|
|
solAssert(rightType->integerType(), "integerType() called for fractional number.");
|
|
c_rightSigned = rightType->integerType()->isSigned();
|
|
}
|
|
else if (auto rightType = dynamic_cast<IntegerType const*>(&_rightType))
|
|
c_rightSigned = rightType->isSigned();
|
|
else
|
|
solUnimplemented("Not implemented yet - FixedPointType.");
|
|
|
|
// shift with negative rvalue throws exception
|
|
if (c_rightSigned)
|
|
{
|
|
m_context << u256(0) << Instruction::DUP3 << Instruction::SLT;
|
|
m_context.appendConditionalJumpTo(m_context.errorTag());
|
|
}
|
|
|
|
switch (_operator)
|
|
{
|
|
case Token::SHL:
|
|
m_context << Instruction::SWAP1 << u256(2) << Instruction::EXP << Instruction::MUL;
|
|
break;
|
|
case Token::SAR:
|
|
m_context << Instruction::SWAP1 << u256(2) << Instruction::EXP << Instruction::SWAP1 << (c_leftSigned ? Instruction::SDIV : Instruction::DIV);
|
|
break;
|
|
case Token::SHR:
|
|
default:
|
|
BOOST_THROW_EXCEPTION(InternalCompilerError() << errinfo_comment("Unknown shift operator."));
|
|
}
|
|
}
|
|
|
|
void ExpressionCompiler::appendExternalFunctionCall(
|
|
FunctionType const& _functionType,
|
|
vector<ASTPointer<Expression const>> const& _arguments
|
|
)
|
|
{
|
|
solAssert(
|
|
_functionType.takesArbitraryParameters() ||
|
|
_arguments.size() == _functionType.parameterTypes().size(), ""
|
|
);
|
|
|
|
// Assumed stack content here:
|
|
// <stack top>
|
|
// value [if _functionType.valueSet()]
|
|
// gas [if _functionType.gasSet()]
|
|
// self object [if bound - moved to top right away]
|
|
// function identifier [unless bare]
|
|
// contract address
|
|
|
|
unsigned selfSize = _functionType.bound() ? _functionType.selfType()->sizeOnStack() : 0;
|
|
unsigned gasValueSize = (_functionType.gasSet() ? 1 : 0) + (_functionType.valueSet() ? 1 : 0);
|
|
unsigned contractStackPos = m_context.currentToBaseStackOffset(1 + gasValueSize + selfSize + (_functionType.isBareCall() ? 0 : 1));
|
|
unsigned gasStackPos = m_context.currentToBaseStackOffset(gasValueSize);
|
|
unsigned valueStackPos = m_context.currentToBaseStackOffset(1);
|
|
|
|
// move self object to top
|
|
if (_functionType.bound())
|
|
utils().moveToStackTop(gasValueSize, _functionType.selfType()->sizeOnStack());
|
|
|
|
using FunctionKind = FunctionType::Location;
|
|
FunctionKind funKind = _functionType.location();
|
|
bool returnSuccessCondition = funKind == FunctionKind::Bare || funKind == FunctionKind::BareCallCode;
|
|
bool isCallCode = funKind == FunctionKind::BareCallCode || funKind == FunctionKind::CallCode;
|
|
bool isDelegateCall = funKind == FunctionKind::BareDelegateCall || funKind == FunctionKind::DelegateCall;
|
|
|
|
unsigned retSize = 0;
|
|
if (returnSuccessCondition)
|
|
retSize = 0; // return value actually is success condition
|
|
else
|
|
for (auto const& retType: _functionType.returnParameterTypes())
|
|
{
|
|
solAssert(!retType->isDynamicallySized(), "Unable to return dynamic type from external call.");
|
|
retSize += retType->calldataEncodedSize();
|
|
}
|
|
|
|
// Evaluate arguments.
|
|
TypePointers argumentTypes;
|
|
TypePointers parameterTypes = _functionType.parameterTypes();
|
|
bool manualFunctionId = false;
|
|
if (
|
|
(funKind == FunctionKind::Bare || funKind == FunctionKind::BareCallCode || funKind == FunctionKind::BareDelegateCall) &&
|
|
!_arguments.empty()
|
|
)
|
|
{
|
|
solAssert(_arguments.front()->annotation().type->mobileType(), "");
|
|
manualFunctionId =
|
|
_arguments.front()->annotation().type->mobileType()->calldataEncodedSize(false) ==
|
|
CompilerUtils::dataStartOffset;
|
|
}
|
|
if (manualFunctionId)
|
|
{
|
|
// If we have a Bare* and the first type has exactly 4 bytes, use it as
|
|
// function identifier.
|
|
_arguments.front()->accept(*this);
|
|
utils().convertType(
|
|
*_arguments.front()->annotation().type,
|
|
IntegerType(8 * CompilerUtils::dataStartOffset),
|
|
true
|
|
);
|
|
for (unsigned i = 0; i < gasValueSize; ++i)
|
|
m_context << swapInstruction(gasValueSize - i);
|
|
gasStackPos++;
|
|
valueStackPos++;
|
|
}
|
|
if (_functionType.bound())
|
|
{
|
|
argumentTypes.push_back(_functionType.selfType());
|
|
parameterTypes.insert(parameterTypes.begin(), _functionType.selfType());
|
|
}
|
|
for (size_t i = manualFunctionId ? 1 : 0; i < _arguments.size(); ++i)
|
|
{
|
|
_arguments[i]->accept(*this);
|
|
argumentTypes.push_back(_arguments[i]->annotation().type);
|
|
}
|
|
|
|
if (funKind == FunctionKind::ECRecover)
|
|
{
|
|
// Clears 32 bytes of currently free memory and advances free memory pointer.
|
|
// Output area will be "start of input area" - 32.
|
|
// The reason is that a failing ECRecover cannot be detected, it will just return
|
|
// zero bytes (which we cannot detect).
|
|
solAssert(0 < retSize && retSize <= 32, "");
|
|
utils().fetchFreeMemoryPointer();
|
|
m_context << Instruction::DUP1 << u256(0) << Instruction::MSTORE;
|
|
m_context << u256(32) << Instruction::ADD;
|
|
utils().storeFreeMemoryPointer();
|
|
}
|
|
|
|
// Touch the end of the output area so that we do not pay for memory resize during the call
|
|
// (which we would have to subtract from the gas left)
|
|
// We could also just use MLOAD; POP right before the gas calculation, but the optimizer
|
|
// would remove that, so we use MSTORE here.
|
|
if (!_functionType.gasSet() && retSize > 0)
|
|
{
|
|
m_context << u256(0);
|
|
utils().fetchFreeMemoryPointer();
|
|
// This touches too much, but that way we save some rounding arithmetics
|
|
m_context << u256(retSize) << Instruction::ADD << Instruction::MSTORE;
|
|
}
|
|
|
|
// Copy function identifier to memory.
|
|
utils().fetchFreeMemoryPointer();
|
|
if (!_functionType.isBareCall() || manualFunctionId)
|
|
{
|
|
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.
|
|
// Move arguments to memory, will not update the free memory pointer (but will update the memory
|
|
// pointer on the stack).
|
|
utils().encodeToMemory(
|
|
argumentTypes,
|
|
parameterTypes,
|
|
_functionType.padArguments(),
|
|
_functionType.takesArbitraryParameters(),
|
|
isCallCode || isDelegateCall
|
|
);
|
|
|
|
// Stack now:
|
|
// <stack top>
|
|
// input_memory_end
|
|
// value [if _functionType.valueSet()]
|
|
// gas [if _functionType.gasSet()]
|
|
// function identifier [unless bare]
|
|
// contract address
|
|
|
|
// Output data will replace input data, unless we have ECRecover (then, output
|
|
// area will be 32 bytes just before input area).
|
|
// put on stack: <size of output> <memory pos of output> <size of input> <memory pos of input>
|
|
m_context << u256(retSize);
|
|
utils().fetchFreeMemoryPointer(); // This is the start of input
|
|
if (funKind == FunctionKind::ECRecover)
|
|
{
|
|
// In this case, output is 32 bytes before input and has already been cleared.
|
|
m_context << u256(32) << Instruction::DUP2 << Instruction::SUB << Instruction::SWAP1;
|
|
// Here: <input end> <output size> <outpos> <input pos>
|
|
m_context << Instruction::DUP1 << Instruction::DUP5 << Instruction::SUB;
|
|
m_context << Instruction::SWAP1;
|
|
}
|
|
else
|
|
{
|
|
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 << dupInstruction(m_context.baseToCurrentStackOffset(valueStackPos));
|
|
else
|
|
m_context << u256(0);
|
|
m_context << dupInstruction(m_context.baseToCurrentStackOffset(contractStackPos));
|
|
|
|
bool existenceChecked = false;
|
|
// Check the the target contract exists (has code) for non-low-level calls.
|
|
if (funKind == FunctionKind::External || funKind == FunctionKind::CallCode || funKind == FunctionKind::DelegateCall)
|
|
{
|
|
m_context << Instruction::DUP1 << Instruction::EXTCODESIZE << Instruction::ISZERO;
|
|
m_context.appendConditionalJumpTo(m_context.errorTag());
|
|
existenceChecked = true;
|
|
}
|
|
|
|
if (_functionType.gasSet())
|
|
m_context << dupInstruction(m_context.baseToCurrentStackOffset(gasStackPos));
|
|
else
|
|
{
|
|
// send all gas except the amount needed to execute "SUB" and "CALL"
|
|
// @todo this retains too much gas for now, needs to be fine-tuned.
|
|
u256 gasNeededByCaller = eth::GasCosts::callGas + 10;
|
|
if (_functionType.valueSet())
|
|
gasNeededByCaller += eth::GasCosts::callValueTransferGas;
|
|
if (!isCallCode && !isDelegateCall && !existenceChecked)
|
|
gasNeededByCaller += eth::GasCosts::callNewAccountGas; // we never know
|
|
m_context << gasNeededByCaller << Instruction::GAS << Instruction::SUB;
|
|
}
|
|
if (isDelegateCall)
|
|
m_context << Instruction::DELEGATECALL;
|
|
else if (isCallCode)
|
|
m_context << Instruction::CALLCODE;
|
|
else
|
|
m_context << Instruction::CALL;
|
|
|
|
unsigned remainsSize =
|
|
2 + // contract address, input_memory_end
|
|
_functionType.valueSet() +
|
|
_functionType.gasSet() +
|
|
(!_functionType.isBareCall() || manualFunctionId);
|
|
|
|
if (returnSuccessCondition)
|
|
m_context << swapInstruction(remainsSize);
|
|
else
|
|
{
|
|
//Propagate error condition (if CALL pushes 0 on stack).
|
|
m_context << Instruction::ISZERO;
|
|
m_context.appendConditionalJumpTo(m_context.errorTag());
|
|
}
|
|
|
|
utils().popStackSlots(remainsSize);
|
|
|
|
if (returnSuccessCondition)
|
|
{
|
|
// already there
|
|
}
|
|
else if (funKind == FunctionKind::RIPEMD160)
|
|
{
|
|
// fix: built-in contract returns right-aligned data
|
|
utils().fetchFreeMemoryPointer();
|
|
utils().loadFromMemoryDynamic(IntegerType(160), false, true, false);
|
|
utils().convertType(IntegerType(160), FixedBytesType(20));
|
|
}
|
|
else if (funKind == FunctionKind::ECRecover)
|
|
{
|
|
// Output is 32 bytes before input / free mem pointer.
|
|
// Failing ecrecover cannot be detected, so we clear output before the call.
|
|
m_context << u256(32);
|
|
utils().fetchFreeMemoryPointer();
|
|
m_context << Instruction::SUB << Instruction::MLOAD;
|
|
}
|
|
else if (!_functionType.returnParameterTypes().empty())
|
|
{
|
|
utils().fetchFreeMemoryPointer();
|
|
bool memoryNeeded = false;
|
|
for (auto const& retType: _functionType.returnParameterTypes())
|
|
{
|
|
utils().loadFromMemoryDynamic(*retType, false, true, true);
|
|
if (dynamic_cast<ReferenceType const*>(retType.get()))
|
|
memoryNeeded = true;
|
|
}
|
|
if (memoryNeeded)
|
|
utils().storeFreeMemoryPointer();
|
|
else
|
|
m_context << Instruction::POP;
|
|
}
|
|
}
|
|
|
|
void ExpressionCompiler::appendExpressionCopyToMemory(Type const& _expectedType, Expression const& _expression)
|
|
{
|
|
solUnimplementedAssert(_expectedType.isValueType(), "Not implemented for non-value types.");
|
|
_expression.accept(*this);
|
|
utils().convertType(*_expression.annotation().type, _expectedType, true);
|
|
utils().storeInMemoryDynamic(_expectedType);
|
|
}
|
|
|
|
void ExpressionCompiler::appendVariable(VariableDeclaration const& _variable, Expression const& _expression)
|
|
{
|
|
if (!_variable.isConstant())
|
|
setLValueFromDeclaration(_variable, _expression);
|
|
else
|
|
{
|
|
_variable.value()->accept(*this);
|
|
utils().convertType(*_variable.value()->annotation().type, *_variable.annotation().type);
|
|
}
|
|
}
|
|
|
|
void ExpressionCompiler::setLValueFromDeclaration(Declaration const& _declaration, Expression const& _expression)
|
|
{
|
|
if (m_context.isLocalVariable(&_declaration))
|
|
setLValue<StackVariable>(_expression, dynamic_cast<VariableDeclaration const&>(_declaration));
|
|
else if (m_context.isStateVariable(&_declaration))
|
|
setLValue<StorageItem>(_expression, dynamic_cast<VariableDeclaration const&>(_declaration));
|
|
else
|
|
BOOST_THROW_EXCEPTION(InternalCompilerError()
|
|
<< errinfo_sourceLocation(_expression.location())
|
|
<< errinfo_comment("Identifier type not supported or identifier not found."));
|
|
}
|
|
|
|
void ExpressionCompiler::setLValueToStorageItem(Expression const& _expression)
|
|
{
|
|
setLValue<StorageItem>(_expression, *_expression.annotation().type);
|
|
}
|
|
|
|
CompilerUtils ExpressionCompiler::utils()
|
|
{
|
|
return CompilerUtils(m_context);
|
|
}
|
|
|
|
}
|
|
}
|