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Block: split generateStatePermutations into type and state parts

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this makes it marginally faster, since we can skip all permutations containing invalid type data.
I measured a performance improvement of about 20% across all blocks.
In addition, this makes it easier to locate where a problem is coming from if invalid inputs are accepted.
This commit is contained in:
Dylan K. Taylor 2023-10-17 11:28:58 +01:00
parent 82d6fc3890
commit b0936a50c1
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GPG Key ID: 8927471A91CAFD3D
1 changed files with 20 additions and 6 deletions
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26
src/block/Block.php
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@ -304,18 +304,32 @@ class Block{
if($bits > Block::INTERNAL_STATE_DATA_BITS){
throw new \LogicException("Block state data cannot use more than " . Block::INTERNAL_STATE_DATA_BITS . " bits");
}
for($stateData = 0; $stateData < (1 << $bits); ++$stateData){
$v = clone $this;
for($blockItemStateData = 0; $blockItemStateData < (1 << $this->requiredBlockItemStateDataBits); ++$blockItemStateData){
$withType = clone $this;
try{
$v->decodeFullState($stateData);
if($v->encodeFullState() !== $stateData){
throw new \LogicException(static::class . "::decodeStateData() accepts invalid state data (returned " . $v->encodeFullState() . " for input $stateData)");
$withType->decodeBlockItemState($blockItemStateData);
$encoded = $withType->encodeBlockItemState();
if($encoded !== $blockItemStateData){
throw new \LogicException(static::class . "::decodeBlockItemState() accepts invalid inputs (returned $encoded for input $blockItemStateData)");
}
}catch(InvalidSerializedRuntimeDataException){ //invalid property combination, leave it
continue;
}
yield $v;
for($blockOnlyStateData = 0; $blockOnlyStateData < (1 << $this->requiredBlockOnlyStateDataBits); ++$blockOnlyStateData){
$withState = clone $withType;
try{
$withState->decodeBlockOnlyState($blockOnlyStateData);
$encoded = $withState->encodeBlockOnlyState();
if($encoded !== $blockOnlyStateData){
throw new \LogicException(static::class . "::decodeBlockOnlyState() accepts invalid inputs (returned $encoded for input $blockOnlyStateData)");
}
}catch(InvalidSerializedRuntimeDataException){ //invalid property combination, leave it
continue;
}
yield $withState;
}
}
}