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| author | chriseth <chris@ethereum.org> | 2018-12-12 07:49:36 +0800 |
|---|---|---|
| committer | chriseth <chris@ethereum.org> | 2018-12-13 01:06:28 +0800 |
| commit | 9557dd7e74a801ebafaf4777d60a591b0c484779 (patch) | |
| tree | b55af218e8debaeb4a79670f932e1e66afb736b6 /libyul/optimiser/SSAValueTracker.cpp | |
| parent | 5e0c312dad2daaae155486397bfbd26d6d172718 (diff) | |
| download | dexon-solidity-9557dd7e74a801ebafaf4777d60a591b0c484779.tar.gz dexon-solidity-9557dd7e74a801ebafaf4777d60a591b0c484779.tar.zst dexon-solidity-9557dd7e74a801ebafaf4777d60a591b0c484779.zip | |
Support unassigned variables in the SSA value tracker and the data flow analyzer.
Diffstat (limited to 'libyul/optimiser/SSAValueTracker.cpp')
| -rw-r--r-- | libyul/optimiser/SSAValueTracker.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/libyul/optimiser/SSAValueTracker.cpp b/libyul/optimiser/SSAValueTracker.cpp index ef96c379..a0e44b2b 100644 --- a/libyul/optimiser/SSAValueTracker.cpp +++ b/libyul/optimiser/SSAValueTracker.cpp @@ -35,11 +35,12 @@ void SSAValueTracker::operator()(Assignment const& _assignment) void SSAValueTracker::operator()(VariableDeclaration const& _varDecl) { - if (_varDecl.variables.size() == 1) - setValue(_varDecl.variables.front().name, _varDecl.value.get()); - else if (!_varDecl.value) + static Expression const zero{Literal{{}, LiteralKind::Number, YulString{"0"}, {}}}; + if (!_varDecl.value) for (auto const& var: _varDecl.variables) - setValue(var.name, nullptr); + setValue(var.name, &zero); + else if (_varDecl.variables.size() == 1) + setValue(_varDecl.variables.front().name, _varDecl.value.get()); } void SSAValueTracker::setValue(YulString _name, Expression const* _value) |