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Re-use knowledge about keccak calls.

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Re-use knowledge about keccak calls.

Update gas cost.

More tests.

Fix bug.

Update libyul/optimiser/DataFlowAnalyzer.cpp

Remove util prefixes

fix test

More test cases.

Add Changelog entry
This commit is contained in:
chriseth
2022-12-07 14:16:13 +01:00
committed by Nikola Matic
parent 591df04211
commit 79c52b3c9e
14 changed files with 257 additions and 18 deletions
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libyul/optimiser/DataFlowAnalyzer.h
+7
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@@ -108,6 +108,7 @@ public:
std::map<YulString, AssignedValue> const& allValues() const { return m_state.value; }
std::optional<YulString> storageValue(YulString _key) const;
std::optional<YulString> memoryValue(YulString _key) const;
std::optional<YulString> keccakValue(YulString _start, YulString _length) const;
protected:
/// Registers the assignment.
@@ -157,6 +158,10 @@ protected:
Expression const& _expression
) const;
/// Checks if the expression is keccak256(s, l)
/// where s and l are variables and returns these variables in that case.
std::optional<std::pair<YulString, YulString>> isKeccak(Expression const& _expression) const;
Dialect const& m_dialect;
/// Side-effects of user-defined functions. Worst-case side-effects are assumed
/// if this is not provided or the function is not found.
@@ -167,6 +172,8 @@ private:
{
std::unordered_map<YulString, YulString> storage;
std::unordered_map<YulString, YulString> memory;
/// If keccak[s, l] = y then y := keccak256(s, l) occurs in the code.
std::map<std::pair<YulString, YulString>, YulString> keccak;
};
struct State
{