solidity/libyul/optimiser/BlockHasher.cpp

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/*
This file is part of solidity.
solidity 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.
solidity 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 solidity. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Optimiser component that calculates hash values for block prefixes.
*/
#include <libyul/optimiser/BlockHasher.h>
#include <libyul/optimiser/SyntacticalEquality.h>
#include <libyul/Utilities.h>
#include <libsolutil/CommonData.h>
using namespace std;
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using namespace solidity;
using namespace solidity::yul;
using namespace solidity::util;
namespace
{
static constexpr uint64_t compileTimeLiteralHash(char const* _literal, size_t _n)
{
return (_n == 0) ? BlockHasher::fnvEmptyHash : (static_cast<uint64_t>(_literal[0]) * BlockHasher::fnvPrime) ^ compileTimeLiteralHash(_literal + 1, _n - 1);
}
template<size_t N>
static constexpr uint64_t compileTimeLiteralHash(char const (&_literal)[N])
{
return compileTimeLiteralHash(_literal, N);
}
}
std::map<Block const*, uint64_t> BlockHasher::run(Block const& _block)
{
std::map<Block const*, uint64_t> result;
BlockHasher blockHasher(result);
blockHasher(_block);
return result;
}
void BlockHasher::operator()(Literal const& _literal)
{
hash64(compileTimeLiteralHash("Literal"));
hash64(_literal.value.hash());
hash64(_literal.type.hash());
hash8(static_cast<uint8_t>(_literal.kind));
}
void BlockHasher::operator()(Identifier const& _identifier)
{
hash64(compileTimeLiteralHash("Identifier"));
auto it = m_variableReferences.find(_identifier.name);
if (it == m_variableReferences.end())
{
it = m_variableReferences.emplace(_identifier.name, VariableReference {
m_externalIdentifierCount++,
true
}).first;
m_externalReferences.emplace_back(_identifier.name);
}
if (it->second.isExternal)
hash64(compileTimeLiteralHash("external"));
else
hash64(compileTimeLiteralHash("internal"));
hash64(it->second.id);
}
void BlockHasher::operator()(FunctionCall const& _funCall)
{
hash64(compileTimeLiteralHash("FunctionCall"));
hash64(_funCall.functionName.name.hash());
hash64(_funCall.arguments.size());
ASTWalker::operator()(_funCall);
}
void BlockHasher::operator()(ExpressionStatement const& _statement)
{
hash64(compileTimeLiteralHash("ExpressionStatement"));
ASTWalker::operator()(_statement);
}
void BlockHasher::operator()(Assignment const& _assignment)
{
hash64(compileTimeLiteralHash("Assignment"));
hash64(_assignment.variableNames.size());
for (auto const& name: _assignment.variableNames)
(*this)(name);
visit(*_assignment.value);
}
void BlockHasher::operator()(VariableDeclaration const& _varDecl)
{
hash64(compileTimeLiteralHash("VariableDeclaration"));
hash64(_varDecl.variables.size());
for (auto const& var: _varDecl.variables)
{
yulAssert(!m_variableReferences.count(var.name), "");
m_variableReferences[var.name] = VariableReference{
m_internalIdentifierCount++,
false
};
}
ASTWalker::operator()(_varDecl);
}
void BlockHasher::operator()(If const& _if)
{
hash64(compileTimeLiteralHash("If"));
ASTWalker::operator()(_if);
}
void BlockHasher::operator()(Switch const& _switch)
{
hash64(compileTimeLiteralHash("Switch"));
hash64(_switch.cases.size());
// Instead of sorting we could consider to combine
// the case hashes using a commutative operation here.
std::set<Case const*, SwitchCaseCompareByLiteralValue> cases;
for (auto const& _case: _switch.cases)
cases.insert(&_case);
visit(*_switch.expression);
for (auto const& _case: cases)
{
if (_case->value)
(*this)(*_case->value);
(*this)(_case->body);
}
}
void BlockHasher::operator()(FunctionDefinition const& _funDef)
{
hash64(compileTimeLiteralHash("FunctionDefinition"));
ASTWalker::operator()(_funDef);
}
void BlockHasher::operator()(ForLoop const& _loop)
{
yulAssert(_loop.pre.statements.empty(), "");
hash64(compileTimeLiteralHash("ForLoop"));
ASTWalker::operator()(_loop);
}
void BlockHasher::operator()(Break const& _break)
{
hash64(compileTimeLiteralHash("Break"));
ASTWalker::operator()(_break);
}
void BlockHasher::operator()(Continue const& _continue)
{
hash64(compileTimeLiteralHash("Continue"));
ASTWalker::operator()(_continue);
}
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void BlockHasher::operator()(Leave const& _leaveStatement)
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{
hash64(compileTimeLiteralHash("Leave"));
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ASTWalker::operator()(_leaveStatement);
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}
void BlockHasher::operator()(Block const& _block)
{
hash64(compileTimeLiteralHash("Block"));
hash64(_block.statements.size());
if (_block.statements.empty())
return;
BlockHasher subBlockHasher(m_blockHashes);
for (auto const& statement: _block.statements)
subBlockHasher.visit(statement);
m_blockHashes[&_block] = subBlockHasher.m_hash;
hash64(subBlockHasher.m_hash);
hash64(subBlockHasher.m_externalReferences.size());
for (auto& externalReference: subBlockHasher.m_externalReferences)
(*this)(Identifier{{}, externalReference});
}