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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
* Utilities for the solidity compiler.
*/
#include <libsolidity/codegen/CompilerContext.h>
#include <utility>
#include <numeric>
#include <libsolidity/ast/AST.h>
#include <libsolidity/codegen/Compiler.h>
#include <libsolidity/interface/Version.h>
using namespace std;
namespace dev
{
namespace solidity
{
void CompilerContext::addMagicGlobal(MagicVariableDeclaration const& _declaration)
{
m_magicGlobals.insert(&_declaration);
}
void CompilerContext::addStateVariable(
VariableDeclaration const& _declaration,
u256 const& _storageOffset,
unsigned _byteOffset
)
{
m_stateVariables[&_declaration] = make_pair(_storageOffset, _byteOffset);
}
void CompilerContext::startFunction(Declaration const& _function)
{
m_functionsWithCode.insert(&_function);
*this << functionEntryLabel(_function);
}
void CompilerContext::addVariable(VariableDeclaration const& _declaration,
unsigned _offsetToCurrent)
{
solAssert(m_asm.deposit() >= 0 && unsigned(m_asm.deposit()) >= _offsetToCurrent, "");
m_localVariables[&_declaration] = unsigned(m_asm.deposit()) - _offsetToCurrent;
}
void CompilerContext::removeVariable(VariableDeclaration const& _declaration)
{
solAssert(!!m_localVariables.count(&_declaration), "");
m_localVariables.erase(&_declaration);
}
eth::Assembly const& CompilerContext::compiledContract(const ContractDefinition& _contract) const
{
auto ret = m_compiledContracts.find(&_contract);
solAssert(ret != m_compiledContracts.end(), "Compiled contract not found.");
return *ret->second;
}
bool CompilerContext::isLocalVariable(Declaration const* _declaration) const
{
return !!m_localVariables.count(_declaration);
}
eth::AssemblyItem CompilerContext::functionEntryLabel(Declaration const& _declaration)
{
auto res = m_functionEntryLabels.find(&_declaration);
if (res == m_functionEntryLabels.end())
{
eth::AssemblyItem tag(m_asm.newTag());
m_functionEntryLabels.insert(make_pair(&_declaration, tag));
return tag.tag();
}
else
return res->second.tag();
}
eth::AssemblyItem CompilerContext::functionEntryLabelIfExists(Declaration const& _declaration) const
{
auto res = m_functionEntryLabels.find(&_declaration);
return res == m_functionEntryLabels.end() ? eth::AssemblyItem(eth::UndefinedItem) : res->second.tag();
}
eth::AssemblyItem CompilerContext::virtualFunctionEntryLabel(FunctionDefinition const& _function)
{
solAssert(!m_inheritanceHierarchy.empty(), "No inheritance hierarchy set.");
return virtualFunctionEntryLabel(_function, m_inheritanceHierarchy.begin());
}
eth::AssemblyItem CompilerContext::superFunctionEntryLabel(FunctionDefinition const& _function, ContractDefinition const& _base)
{
solAssert(!m_inheritanceHierarchy.empty(), "No inheritance hierarchy set.");
return virtualFunctionEntryLabel(_function, superContract(_base));
}
FunctionDefinition const* CompilerContext::nextConstructor(ContractDefinition const& _contract) const
{
vector<ContractDefinition const*>::const_iterator it = superContract(_contract);
for (; it != m_inheritanceHierarchy.end(); ++it)
if ((*it)->constructor())
return (*it)->constructor();
return nullptr;
}
set<Declaration const*> CompilerContext::functionsWithoutCode()
{
set<Declaration const*> functions;
for (auto const& it: m_functionEntryLabels)
if (m_functionsWithCode.count(it.first) == 0)
functions.insert(it.first);
return functions;
}
ModifierDefinition const& CompilerContext::functionModifier(string const& _name) const
{
solAssert(!m_inheritanceHierarchy.empty(), "No inheritance hierarchy set.");
for (ContractDefinition const* contract: m_inheritanceHierarchy)
for (ModifierDefinition const* modifier: contract->functionModifiers())
if (modifier->name() == _name)
return *modifier;
BOOST_THROW_EXCEPTION(InternalCompilerError()
<< errinfo_comment("Function modifier " + _name + " not found."));
}
unsigned CompilerContext::baseStackOffsetOfVariable(Declaration const& _declaration) const
{
auto res = m_localVariables.find(&_declaration);
solAssert(res != m_localVariables.end(), "Variable not found on stack.");
return res->second;
}
unsigned CompilerContext::baseToCurrentStackOffset(unsigned _baseOffset) const
{
return m_asm.deposit() - _baseOffset - 1;
}
unsigned CompilerContext::currentToBaseStackOffset(unsigned _offset) const
{
return m_asm.deposit() - _offset - 1;
}
pair<u256, unsigned> CompilerContext::storageLocationOfVariable(const Declaration& _declaration) const
{
auto it = m_stateVariables.find(&_declaration);
solAssert(it != m_stateVariables.end(), "Variable not found in storage.");
return it->second;
}
CompilerContext& CompilerContext::appendJump(eth::AssemblyItem::JumpType _jumpType)
{
eth::AssemblyItem item(solidity::Instruction::JUMP);
item.setJumpType(_jumpType);
return *this << item;
}
void CompilerContext::resetVisitedNodes(ASTNode const* _node)
{
stack<ASTNode const*> newStack;
newStack.push(_node);
std::swap(m_visitedNodes, newStack);
updateSourceLocation();
}
void CompilerContext::injectVersionStampIntoSub(size_t _subIndex)
{
eth::Assembly& sub = m_asm.sub(_subIndex);
sub.injectStart(solidity::Instruction::POP);
sub.injectStart(fromBigEndian<u256>(binaryVersion()));
}
eth::AssemblyItem CompilerContext::virtualFunctionEntryLabel(
FunctionDefinition const& _function,
vector<ContractDefinition const*>::const_iterator _searchStart
)
{
string name = _function.name();
FunctionType functionType(_function);
auto it = _searchStart;
for (; it != m_inheritanceHierarchy.end(); ++it)
for (FunctionDefinition const* function: (*it)->definedFunctions())
if (
function->name() == name &&
!function->isConstructor() &&
FunctionType(*function).hasEqualArgumentTypes(functionType)
)
return functionEntryLabel(*function);
solAssert(false, "Super function " + name + " not found.");
return m_asm.newTag(); // not reached
}
vector<ContractDefinition const*>::const_iterator CompilerContext::superContract(ContractDefinition const& _contract) const
{
solAssert(!m_inheritanceHierarchy.empty(), "No inheritance hierarchy set.");
auto it = find(m_inheritanceHierarchy.begin(), m_inheritanceHierarchy.end(), &_contract);
solAssert(it != m_inheritanceHierarchy.end(), "Base not found in inheritance hierarchy.");
return ++it;
}
void CompilerContext::updateSourceLocation()
{
m_asm.setSourceLocation(m_visitedNodes.empty() ? SourceLocation() : m_visitedNodes.top()->location());
}
}
}
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