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Fix copying byte arrays from storage to storage.

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This commit is contained in:
chriseth 2020-12-10 18:16:45 +01:00
parent d84415cb3b
commit 7764ee8d86
2 changed files with 37 additions and 5 deletions
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16
libsolidity/codegen/YulUtilFunctions.cpp
View File

@ -1633,8 +1633,9 @@ string YulUtilFunctions::copyByteArrayToStorageFunction(ArrayType const& _fromTy
let oldLen := <byteArrayLength>(sload(slot))
let srcOffset := 0
<?fromMemory>
src := add(src, 0x20)
srcOffset := 0x20
</fromMemory>
// This is not needed in all branches.
@ -1652,14 +1653,16 @@ string YulUtilFunctions::copyByteArrayToStorageFunction(ArrayType const& _fromTy
switch gt(newLen, 31)
case 1 {
let loopEnd := and(newLen, not(0x1f))
<?fromStorage> src := <srcDataLocation>(src) </fromStorage>
let dstPtr := dstDataArea
let i := 0
for { } lt(i, loopEnd) { i := add(i, 32) } {
sstore(dstPtr, <read>(add(src, i)))
for { } lt(i, loopEnd) { i := add(i, 0x20) } {
sstore(dstPtr, <read>(add(src, srcOffset)))
dstPtr := add(dstPtr, 1)
srcOffset := add(srcOffset, <srcIncrement>)
}
if lt(loopEnd, newLen) {
let lastValue := <read>(add(src, i))
let lastValue := <read>(add(src, srcOffset))
sstore(dstPtr, <maskBytes>(lastValue, and(newLen, 0x1f)))
}
sstore(slot, add(mul(newLen, 2), 1))
@ -1667,7 +1670,7 @@ string YulUtilFunctions::copyByteArrayToStorageFunction(ArrayType const& _fromTy
default {
let value := 0
if newLen {
value := <read>(src)
value := <read>(add(src, srcOffset))
}
sstore(slot, <byteArrayCombineShort>(value, newLen))
}
@ -1683,7 +1686,10 @@ string YulUtilFunctions::copyByteArrayToStorageFunction(ArrayType const& _fromTy
templ("panic", panicFunction());
templ("byteArrayLength", extractByteArrayLengthFunction());
templ("dstDataLocation", arrayDataAreaFunction(_toType));
if (fromStorage)
templ("srcDataLocation", arrayDataAreaFunction(_fromType));
templ("clearStorageRange", clearStorageRangeFunction(*_toType.baseType()));
templ("srcIncrement", to_string(fromStorage ? 1 : 0x20));
templ("read", fromStorage ? "sload" : fromCalldata ? "calldataload" : "mload");
templ("maskBytes", maskBytesFunctionDynamic());
templ("byteArrayCombineShort", shortByteArrayEncodeUsedAreaSetLengthFunction());

26
test/libsolidity/semanticTests/array/copying/bytes_storage_to_storage.sol Normal file
View File

@ -0,0 +1,26 @@
contract c {
bytes a;
bytes b;
function f(uint len) public returns (bytes memory) {
bytes memory x = new bytes(len);
for (uint i = 0; i < len; i++)
x[i] = byte(uint8(i));
a = x;
for (uint i = 0; i < len; i++)
assert(a[i] == x[i]);
b = a;
for (uint i = 0; i < len; i++)
assert(b[i] == x[i]);
return b;
}
}
// ====
// compileViaYul: also
// ----
// f(uint256): 0 -> 0x20, 0x00
// f(uint256): 31 -> 0x20, 0x1f, 0x0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e00
// f(uint256): 32 -> 0x20, 0x20, 1780731860627700044960722568376592200742329637303199754547598369979440671
// f(uint256): 33 -> 0x20, 33, 1780731860627700044960722568376592200742329637303199754547598369979440671, 0x2000000000000000000000000000000000000000000000000000000000000000
// f(uint256): 63 -> 0x20, 0x3f, 1780731860627700044960722568376592200742329637303199754547598369979440671, 14532552714582660066924456880521368950258152170031413196862950297402215316992
// f(uint256): 12 -> 0x20, 0x0c, 0x0102030405060708090a0b0000000000000000000000000000000000000000
// f(uint256): 129 -> 0x20, 0x81, 1780731860627700044960722568376592200742329637303199754547598369979440671, 0x202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f, 29063324697304692433803953038474361308315562010425523193971352996434451193439, 0x606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f, -57896044618658097711785492504343953926634992332820282019728792003956564819968