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Some more compression.

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This commit is contained in:
chriseth 2019-05-07 15:37:22 +02:00
parent c6b9fa96ae
commit d3d205b6eb
1 changed files with 42 additions and 87 deletions
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129
libsolidity/codegen/YulUtilFunctions.cpp
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@ -419,64 +419,30 @@ string YulUtilFunctions::arrayDataAreaFunction(ArrayType const& _type)
{
string functionName = "array_dataslot_" + _type.identifier();
return m_functionCollector->createFunction(functionName, [&]() {
switch (_type.location())
{
case DataLocation::Memory:
if (_type.isDynamicallySized())
return Whiskers(R"(
function <functionName>(memPtr) -> dataPtr {
dataPtr := add(memPtr, 0x20)
}
)")
("functionName", functionName)
.render();
else
return Whiskers(R"(
function <functionName>(memPtr) -> dataPtr {
dataPtr := memPtr
}
)")
("functionName", functionName)
.render();
case DataLocation::Storage:
if (_type.isDynamicallySized())
{
Whiskers w(R"(
function <functionName>(slot) -> dataSlot {
mstore(0, slot)
dataSlot := keccak256(0, 0x20)
}
)");
w("functionName", functionName);
return w.render();
}
else
{
Whiskers w(R"(
function <functionName>(slot) -> dataSlot {
dataSlot := slot
}
)");
w("functionName", functionName);
return w.render();
}
case DataLocation::CallData:
{
// Calldata arrays are stored as offset of the data area and length
// on the stack, so the offset already points to the data area.
// This might change, if calldata arrays are stored in a single
// stack slot at some point.
Whiskers w(R"(
function <functionName>(slot) -> dataSlot {
dataSlot := slot
}
)");
w("functionName", functionName);
return w.render();
// No special processing for calldata arrays, because they are stored as
// offset of the data area and length on the stack, so the offset already
// points to the data area.
// This might change, if calldata arrays are stored in a single
// stack slot at some point.
return Whiskers(R"(
function <functionName>(ptr) -> data {
data := ptr
<?dynamic>
<?memory>
data := add(ptr, 0x20)
</memory>
<?storage>
mstore(0, ptr)
data := keccak256(0, 0x20)
</storage>
</dynamic>
}
default:
solAssert(false, "");
}
)")
("functionName", functionName)
("dynamic", _type.isDynamicallySized())
("memory", _type.location() == DataLocation::Memory)
("storage", _type.location() == DataLocation::Storage)
.render();
});
}
@ -487,36 +453,25 @@ string YulUtilFunctions::nextArrayElementFunction(ArrayType const& _type)
solAssert(_type.baseType()->storageBytes() > 16, "");
string functionName = "array_nextElement_" + _type.identifier();
return m_functionCollector->createFunction(functionName, [&]() {
switch (_type.location())
{
case DataLocation::Memory:
return Whiskers(R"(
function <functionName>(memPtr) -> nextPtr {
nextPtr := add(memPtr, 0x20)
}
)")
("functionName", functionName)
.render();
case DataLocation::Storage:
return Whiskers(R"(
function <functionName>(slot) -> nextSlot {
nextSlot := add(slot, 1)
}
)")
("functionName", functionName)
.render();
case DataLocation::CallData:
return Whiskers(R"(
function <functionName>(calldataPtr) -> nextPtr {
nextPtr := add(calldataPtr, <stride>)
}
)")
("stride", toCompactHexWithPrefix(_type.baseType()->isDynamicallyEncoded() ? 32 : _type.baseType()->calldataEncodedSize()))
("functionName", functionName)
.render();
default:
solAssert(false, "");
}
Whiskers templ(R"(
function <functionName>(ptr) -> next {
next := add(ptr, <advance>)
}
)");
templ("functionName", functionName);
if (_type.location() == DataLocation::Memory)
templ("advance", "0x20");
else if (_type.location() == DataLocation::Storage)
templ("advance", "1");
else if (_type.location() == DataLocation::CallData)
templ("advance", toCompactHexWithPrefix(
_type.baseType()->isDynamicallyEncoded() ?
32 :
_type.baseType()->calldataEncodedSize()
));
else
solAssert(false, "");
return templ.render();
});
}