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[Sol->Yul] Optimizing delete struct.

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Co-authored-by: Daniel Kirchner <daniel@ekpyron.org>
This commit is contained in:
Djordje Mijovic
2020-10-14 13:35:15 +02:00
co-authored by Daniel Kirchner
parent 92a2cddbfa
commit 6f7947cfa5
5 changed files with 140 additions and 11 deletions
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libsolidity/codegen/YulUtilFunctions.cpp
+23 -11
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@@ -1266,19 +1266,31 @@ string YulUtilFunctions::clearStorageStructFunction(StructType const& _type)
MemberList::MemberMap structMembers = _type.nativeMembers(nullptr);
vector<map<string, string>> memberSetValues;
set<u256> slotsCleared;
for (auto const& member: structMembers)
{
auto const& [memberSlotDiff, memberStorageOffset] = _type.storageOffsetsOfMember(member.name);
if (member.type->storageBytes() < 32)
{
auto const& slotDiff = _type.storageOffsetsOfMember(member.name).first;
if (!slotsCleared.count(slotDiff))
{
memberSetValues.emplace_back().emplace("clearMember", "sstore(add(slot, " + slotDiff.str() + "), 0)");
slotsCleared.emplace(slotDiff);
}
}
else
{
auto const& [memberSlotDiff, memberStorageOffset] = _type.storageOffsetsOfMember(member.name);
solAssert(memberStorageOffset == 0, "");
memberSetValues.emplace_back().emplace("clearMember", Whiskers(R"(
<setZero>(add(slot, <memberSlotDiff>), <memberStorageOffset>)
)")
("setZero", storageSetToZeroFunction(*member.type))
("memberSlotDiff", memberSlotDiff.str())
("memberStorageOffset", to_string(memberStorageOffset))
.render()
);
}
memberSetValues.emplace_back().emplace("clearMember", Whiskers(R"(
<setZero>(add(slot, <memberSlotDiff>), <memberStorageOffset>)
)")
("setZero", storageSetToZeroFunction(*member.type))
("memberSlotDiff", memberSlotDiff.str())
("memberStorageOffset", to_string(memberStorageOffset))
.render()
);
}
return Whiskers(R"(
function <functionName>(slot) {