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Merge pull request #6318 from ethereum/signal-failure-and-such

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Allow simplification patterns to signal failure
This commit is contained in:
Alex Beregszaszi 2019-03-20 03:38:51 +00:00 committed by GitHub
commit 5245a66d91
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 28 additions and 9 deletions
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17
libevmasm/ExpressionClasses.cpp
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@ -196,13 +196,16 @@ ExpressionClasses::Id ExpressionClasses::tryToSimplify(Expression const& _expr)
if (auto match = rules.findFirstMatch(_expr, *this))
{
// Debug info
//cout << "Simplifying " << *_expr.item << "(";
//for (Id arg: _expr.arguments)
// cout << fullDAGToString(arg) << ", ";
//cout << ")" << endl;
//cout << "with rule " << match->first.toString() << endl;
//ExpressionTemplate t(match->second());
//cout << "to " << match->second().toString() << endl;
if (false)
{
cout << "Simplifying " << *_expr.item << "(";
for (Id arg: _expr.arguments)
cout << fullDAGToString(arg) << ", ";
cout << ")" << endl;
cout << "with rule " << match->pattern.toString() << endl;
cout << "to " << match->action().toString() << endl;
}
return rebuildExpression(ExpressionTemplate(match->action(), _expr.item->location()));
}

13
libevmasm/SimplificationRule.h
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@ -36,9 +36,22 @@ namespace solidity
template <class Pattern>
struct SimplificationRule
{
SimplificationRule(
Pattern _pattern,
std::function<Pattern()> _action,
bool _removesNonConstants,
std::function<bool()> _feasible = {}
):
pattern(std::move(_pattern)),
action(std::move(_action)),
removesNonConstants(_removesNonConstants),
feasible(std::move(_feasible))
{}
Pattern pattern;
std::function<Pattern()> action;
bool removesNonConstants;
std::function<bool()> feasible;
};
}

4
libevmasm/SimplificationRules.cpp
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@ -51,7 +51,9 @@ SimplificationRule<Pattern> const* Rules::findFirstMatch(
for (auto const& rule: m_rules[uint8_t(_expr.item->instruction())])
{
if (rule.pattern.matches(_expr, _classes))
return &rule;
if (!rule.feasible || rule.feasible())
return &rule;
resetMatchGroups();
}
return nullptr;

3
libyul/optimiser/SimplificationRules.cpp
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@ -51,7 +51,8 @@ SimplificationRule<Pattern> const* SimplificationRules::findFirstMatch(
{
rules.resetMatchGroups();
if (rule.pattern.matches(_expr, _dialect, _ssaValues))
return &rule;
if (!rule.feasible || rule.feasible())
return &rule;
}
return nullptr;
}