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Prevent externally used functions from being removed.

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This commit is contained in:
chriseth
2018-10-17 14:12:10 +02:00
parent ba1588828f
commit 5e01d767d0
7 changed files with 36 additions and 15 deletions
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libyul/optimiser/UnusedPruner.cpp
+5 -3
View File
@@ -33,12 +33,14 @@ using namespace std;
using namespace dev;
using namespace dev::yul;
UnusedPruner::UnusedPruner(Block& _ast)
UnusedPruner::UnusedPruner(Block& _ast, set<string> const& _externallyUsedFunctions)
{
ReferencesCounter counter;
counter(_ast);
m_references = counter.references();
for (auto const& f: _externallyUsedFunctions)
++m_references[f];
}
void UnusedPruner::operator()(Block& _block)
@@ -89,11 +91,11 @@ void UnusedPruner::operator()(Block& _block)
ASTModifier::operator()(_block);
}
void UnusedPruner::runUntilStabilised(Block& _ast)
void UnusedPruner::runUntilStabilised(Block& _ast, set<string> const& _externallyUsedFunctions)
{
while (true)
{
UnusedPruner pruner(_ast);
UnusedPruner pruner(_ast, _externallyUsedFunctions);
pruner(_ast);
if (!pruner.shouldRunAgain())
return;
libyul/optimiser/UnusedPruner.h
+2 -2
View File
@@ -44,7 +44,7 @@ namespace yul
class UnusedPruner: public ASTModifier
{
public:
explicit UnusedPruner(Block& _ast);
explicit UnusedPruner(Block& _ast, std::set<std::string> const& _externallyUsedFunctions = std::set<std::string>());
using ASTModifier::operator();
virtual void operator()(Block& _block) override;
@@ -53,7 +53,7 @@ public:
bool shouldRunAgain() const { return m_shouldRunAgain; }
// Run the pruner until the code does not change anymore.
static void runUntilStabilised(Block& _ast);
static void runUntilStabilised(Block& _ast, std::set<std::string> const& _externallyUsedFunctions = std::set<std::string>());
private:
bool used(std::string const& _name) const;