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Fix expression simplifying by moving from SSAValueTracker to DataFlowAnalyzer as a base.

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This commit is contained in:
chriseth
2019-02-27 16:14:39 +01:00
parent 4c1b0fbafa
commit 477c53a46f
5 changed files with 37 additions and 12 deletions
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libyul/optimiser/ExpressionSimplifier.h
+6 -8
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@@ -22,7 +22,7 @@
#include <libyul/AsmDataForward.h>
#include <libyul/optimiser/ASTWalker.h>
#include <libyul/optimiser/DataFlowAnalyzer.h>
namespace yul
{
@@ -33,9 +33,12 @@ struct Dialect;
* The component will work best if the code is in SSA form, but
* this is not required for correctness.
*
* It tracks the current values of variables using the DataFlowAnalyzer
* and takes them into account for replacements.
*
* Prerequisite: Disambiguator.
*/
class ExpressionSimplifier: public ASTModifier
class ExpressionSimplifier: public DataFlowAnalyzer
{
public:
using ASTModifier::operator();
@@ -43,12 +46,7 @@ public:
static void run(Dialect const& _dialect, Block& _ast);
private:
explicit ExpressionSimplifier(Dialect const& _dialect, std::map<YulString, Expression const*> _ssaValues):
m_dialect(_dialect), m_ssaValues(std::move(_ssaValues))
{}
Dialect const& m_dialect;
std::map<YulString, Expression const*> m_ssaValues;
explicit ExpressionSimplifier(Dialect const& _dialect): DataFlowAnalyzer(_dialect) {}
};
}