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Merge pull request #11268 from ethereum/refactorByteArrayPopSol2Yul

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[Sol->Yul] Refactor ByteArrayPop to use unchecked index access
This commit is contained in:
chriseth 2021-04-21 13:05:00 +02:00 committed by GitHub
commit c3d73982ea
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GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 40 additions and 17 deletions
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28
libsolidity/codegen/YulUtilFunctions.cpp
View File

@ -1348,6 +1348,24 @@ string YulUtilFunctions::shortByteArrayEncodeUsedAreaSetLengthFunction()
});
}
string YulUtilFunctions::longByteArrayStorageIndexAccessNoCheckFunction()
{
return m_functionCollector.createFunction(
"long_byte_array_index_access_no_checks",
[&](vector<string>& _args, vector<string>& _returnParams) {
_args = {"array", "index"};
_returnParams = {"slot", "offset"};
return Whiskers(R"(
offset := sub(31, mod(index, 0x20))
let dataArea := <dataAreaFunc>(array)
slot := add(dataArea, div(index, 0x20))
)")
("dataAreaFunc", arrayDataAreaFunction(*TypeProvider::bytesStorage()))
.render();
}
);
}
string YulUtilFunctions::storageArrayPopFunction(ArrayType const& _type)
{
solAssert(_type.location() == DataLocation::Storage, "");
@ -1406,7 +1424,7 @@ string YulUtilFunctions::storageByteArrayPopFunction(ArrayType const& _type)
sstore(array, <encodeUsedSetLen>(data, newLen))
}
default {
let slot, offset := <indexAccess>(array, newLen)
let slot, offset := <indexAccessNoChecks>(array, newLen)
<setToZero>(slot, offset)
sstore(array, sub(data, 2))
}
@ -1417,7 +1435,7 @@ string YulUtilFunctions::storageByteArrayPopFunction(ArrayType const& _type)
("extractByteArrayLength", extractByteArrayLengthFunction())
("transitLongToShort", byteArrayTransitLongToShortFunction(_type))
("encodeUsedSetLen", shortByteArrayEncodeUsedAreaSetLengthFunction())
("indexAccess", storageArrayIndexAccessFunction(_type))
("indexAccessNoChecks", longByteArrayStorageIndexAccessNoCheckFunction())
("setToZero", storageSetToZeroFunction(*_type.baseType()))
.render();
});
@ -2112,13 +2130,12 @@ string YulUtilFunctions::storageArrayIndexAccessFunction(ArrayType const& _type)
<?multipleItemsPerSlot>
<?isBytesArray>
offset := sub(31, mod(index, 0x20))
switch lt(arrayLength, 0x20)
case 0 {
let dataArea := <dataAreaFunc>(array)
slot := add(dataArea, div(index, 0x20))
slot, offset := <indexAccessNoChecks>(array, index)
}
default {
offset := sub(31, mod(index, 0x20))
slot := array
}
<!isBytesArray>
@ -2137,6 +2154,7 @@ string YulUtilFunctions::storageArrayIndexAccessFunction(ArrayType const& _type)
("panic", panicFunction(PanicCode::ArrayOutOfBounds))
("arrayLen", arrayLengthFunction(_type))
("dataAreaFunc", arrayDataAreaFunction(_type))
("indexAccessNoChecks", longByteArrayStorageIndexAccessNoCheckFunction())
("multipleItemsPerSlot", _type.baseType()->storageBytes() <= 16)
("isBytesArray", _type.isByteArray())
("storageSize", _type.baseType()->storageSize().str())

5
libsolidity/codegen/YulUtilFunctions.h
View File

@ -552,6 +552,11 @@ private:
/// signature: (data, len) -> data
std::string shortByteArrayEncodeUsedAreaSetLengthFunction();
/// @returns the name of a function that calculates slot and offset for index
/// Doesn't perform length checks, assumes that index is in bounds
/// signature: (array, index)
std::string longByteArrayStorageIndexAccessNoCheckFunction();
langutil::EVMVersion m_evmVersion;
RevertStrings m_revertStrings;
MultiUseYulFunctionCollector& m_functionCollector;

8
test/cmdlineTests/name_simplifier/output
View File

@ -139,14 +139,14 @@ object "C_59" {
}
function storage_array_index_access_struct_S_1252() -> slot, offset
{
if iszero(lt(slot, 0x02)) { panic_error_0x32() }
slot := add(slot, slot)
if iszero(lt(offset, 0x02)) { panic_error_0x32() }
slot := add(offset, offset)
offset := offset
}
function storage_array_index_access_struct_S() -> slot, offset
{
if iszero(lt(slot, 0x02)) { panic_error_0x32() }
slot := add(0x02, slot)
if iszero(lt(offset, 0x02)) { panic_error_0x32() }
slot := add(0x02, offset)
offset := offset
}
}

2
test/libsolidity/semanticTests/array/byte_array_transitional_2.sol
View File

@ -19,6 +19,6 @@ contract c {
// compileViaYul: also
// ----
// test() -> 0
// gas irOptimized: 311472
// gas irOptimized: 310460
// gas legacy: 483915
// gas legacyOptimized: 478672

2
test/libsolidity/semanticTests/array/dynamic_arrays_in_storage.sol
View File

@ -44,7 +44,7 @@ contract c {
// ----
// getLengths() -> 0, 0
// setLengths(uint256,uint256): 48, 49 ->
// gas irOptimized: 275838
// gas irOptimized: 276212
// gas legacy: 308271
// gas legacyOptimized: 300117
// getLengths() -> 48, 49

2
test/libsolidity/semanticTests/array/pop/byte_array_pop_copy_long.sol
View File

@ -12,6 +12,6 @@ contract c {
// compileViaYul: also
// ----
// test() -> 0x20, 29, 0x0303030303030303030303030303030303030303030303030303030303000000
// gas irOptimized: 163572
// gas irOptimized: 162649
// gas legacy: 245809
// gas legacyOptimized: 242636

2
test/libsolidity/semanticTests/array/pop/byte_array_pop_long_storage_empty.sol
View File

@ -18,7 +18,7 @@ contract c {
// compileViaYul: also
// ----
// test() -> true
// gas irOptimized: 455893
// gas irOptimized: 447028
// gas legacy: 552064
// gas legacyOptimized: 533164
// storage: empty

2
test/libsolidity/semanticTests/array/pop/byte_array_pop_long_storage_empty_garbage_ref.sol
View File

@ -17,7 +17,7 @@ contract c {
// compileViaYul: also
// ----
// test() ->
// gas irOptimized: 300849
// gas irOptimized: 291984
// gas legacy: 372763
// gas legacyOptimized: 366846
// storage: empty

2
test/libsolidity/semanticTests/array/pop/byte_array_pop_masking_long.sol
View File

@ -12,6 +12,6 @@ contract c {
// compileViaYul: also
// ----
// test() -> 0x20, 33, 0x303030303030303030303030303030303030303030303030303030303030303, 0x0300000000000000000000000000000000000000000000000000000000000000
// gas irOptimized: 160904
// gas irOptimized: 160043
// gas legacy: 243287
// gas legacyOptimized: 240361

2
test/libsolidity/semanticTests/array/push/push_no_args_bytes.sol
View File

@ -23,7 +23,7 @@ contract C {
// ----
// l() -> 0
// g(uint256): 70 ->
// gas irOptimized: 428769
// gas irOptimized: 429679
// gas legacy: 419791
// gas legacyOptimized: 415408
// l() -> 70

2
test/libsolidity/semanticTests/constructor/bytes_in_constructors_packer.sol
View File

@ -26,6 +26,6 @@ contract Creator {
// compileViaYul: also
// ----
// f(uint256,bytes): 7, 0x40, 78, "abcdefghijklmnopqrstuvwxyzabcdef", "ghijklmnopqrstuvwxyzabcdefghijkl", "mnopqrstuvwxyz" -> 7, "h"
// gas irOptimized: 323391
// gas irOptimized: 322968
// gas legacy: 414850
// gas legacyOptimized: 290278