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StackToMemoryMover: encapsulate memory offset tracking into its own class.

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This commit is contained in:
Daniel Kirchner
2020-10-06 11:10:43 +02:00
parent 0b87849bcb
commit c8a7098f2f
2 changed files with 63 additions and 49 deletions
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libyul/optimiser/StackToMemoryMover.h
+21 -9
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@@ -100,20 +100,32 @@ public:
void operator()(Block& _block) override;
void visit(Expression& _expression) override;
private:
class VariableMemoryOffsetTracker
{
public:
VariableMemoryOffsetTracker(
u256 _reservedMemory,
std::map<YulString, uint64_t> const& _memorySlots,
uint64_t _numRequiredSlots
): m_reservedMemory(_reservedMemory), m_memorySlots(_memorySlots), m_numRequiredSlots(_numRequiredSlots)
{}
/// @returns a YulString containing the memory offset to be assigned to @a _variable as number literal
/// or std::nullopt if the variable should not be moved.
std::optional<YulString> operator()(YulString _variable) const;
private:
u256 m_reservedMemory;
std::map<YulString, uint64_t> const& m_memorySlots;
uint64_t m_numRequiredSlots = 0;
};
StackToMemoryMover(
OptimiserStepContext& _context,
u256 _reservedMemory,
std::map<YulString, uint64_t> const& _memorySlots,
uint64_t _numRequiredSlots
VariableMemoryOffsetTracker const& _memoryOffsetTracker
);
/// @returns a YulString containing the memory offset to be assigned to @a _variable as number literal.
YulString memoryOffset(YulString _variable);
OptimiserStepContext& m_context;
u256 m_reservedMemory;
std::map<YulString, uint64_t> const& m_memorySlots;
uint64_t m_numRequiredSlots = 0;
VariableMemoryOffsetTracker const& m_memoryOffsetTracker;
NameDispenser& m_nameDispenser;
};