1 files changed, 0 insertions, 117 deletions
diff --git a/libjulia/optimiser/UnusedPruner.cpp b/libjulia/optimiser/UnusedPruner.cpp
deleted file mode 100644
index af503712..00000000
--- a/libjulia/optimiser/UnusedPruner.cpp
+++ /dev/null
@@ -1,117 +0,0 @@
-/*(
-	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/>.
-*/
-/**
- * Optimisation stage that removes unused variables and functions.
- */
-
-#include <libjulia/optimiser/UnusedPruner.h>
-
-#include <libjulia/optimiser/NameCollector.h>
-#include <libjulia/optimiser/Semantics.h>
-#include <libjulia/optimiser/Utilities.h>
-#include <libjulia/Exceptions.h>
-
-#include <libsolidity/inlineasm/AsmData.h>
-
-#include <boost/algorithm/cxx11/none_of.hpp>
-
-using namespace std;
-using namespace dev;
-using namespace dev::julia;
-
-UnusedPruner::UnusedPruner(Block& _ast)
-{
-	ReferencesCounter counter;
-	counter(_ast);
-
-	m_references = counter.references();
-}
-
-void UnusedPruner::operator()(Block& _block)
-{
-	for (auto&& statement: _block.statements)
-		if (statement.type() == typeid(FunctionDefinition))
-		{
-			FunctionDefinition& funDef = boost::get<FunctionDefinition>(statement);
-			if (!used(funDef.name))
-			{
-				subtractReferences(ReferencesCounter::countReferences(funDef.body));
-				statement = Block{std::move(funDef.location), {}};
-			}
-		}
-		else if (statement.type() == typeid(VariableDeclaration))
-		{
-			VariableDeclaration& varDecl = boost::get<VariableDeclaration>(statement);
-			// Multi-variable declarations are special. We can only remove it
-			// if all vairables are unused and the right-hand-side is either
-			// movable or it return a single value. In the latter case, we
-			// replace `let a := f()` by `pop(f())` (in pure Yul, this will be
-			// `drop(f())`).
-			if (boost::algorithm::none_of(
-				varDecl.variables,
-				[=](TypedName const& _typedName) { return used(_typedName.name); }
-			))
-			{
-				if (!varDecl.value)
-					statement = Block{std::move(varDecl.location), {}};
-				else if (MovableChecker(*varDecl.value).movable())
-				{
-					subtractReferences(ReferencesCounter::countReferences(*varDecl.value));
-					statement = Block{std::move(varDecl.location), {}};
-				}
-				else if (varDecl.variables.size() == 1)
-					// In pure Yul, this should be replaced by a function call to `drop`
-					// instead of `pop`.
-					statement = ExpressionStatement{varDecl.location, FunctionalInstruction{
-						varDecl.location,
-						solidity::Instruction::POP,
-						{*std::move(varDecl.value)}
-					}};
-			}
-		}
-
-	removeEmptyBlocks(_block);
-
-	ASTModifier::operator()(_block);
-}
-
-void UnusedPruner::runUntilStabilised(Block& _ast)
-{
-	while (true)
-	{
-		UnusedPruner pruner(_ast);
-		pruner(_ast);
-		if (!pruner.shouldRunAgain())
-			return;
-	}
-}
-
-bool UnusedPruner::used(string const& _name) const
-{
-	return m_references.count(_name) && m_references.at(_name) > 0;
-}
-
-void UnusedPruner::subtractReferences(map<string, size_t> const& _subtrahend)
-{
-	for (auto const& ref: _subtrahend)
-	{
-		assertThrow(m_references.count(ref.first), OptimizerException, "");
-		assertThrow(m_references.at(ref.first) >= ref.second, OptimizerException, "");
-		m_references[ref.first] -= ref.second;
-		m_shouldRunAgain = true;
-	}
-}