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Revise Memory Expansion (#4387)

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Move from a perfect fit memory expansion model to an exponential
expansion model.

Signed-off-by: Danno Ferrin <danno.ferrin@gmail.com>
This commit is contained in:
Danno Ferrin
2022-09-13 17:43:23 -06:00
committed by GitHub
parent 26e23ac808
commit 4691bfdba7
1 changed files with 9 additions and 11 deletions
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20
evm/src/main/java/org/hyperledger/besu/evm/frame/Memory.java
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@@ -44,11 +44,6 @@ public class Memory {
public Memory() {
memBytes = new byte[0];
updateSize();
}
private void updateSize() {
activeWords = memBytes.length / Bytes32.SIZE;
}
private static RuntimeException overflow(final long v) {
@@ -137,11 +132,14 @@ public class Memory {
private void maybeExpandCapacity(final int newActiveWords) {
if (activeWords >= newActiveWords) return;
// Require full capacity to guarantee we don't resize more than once.
byte[] newMem = new byte[newActiveWords * Bytes32.SIZE];
System.arraycopy(memBytes, 0, newMem, 0, memBytes.length);
memBytes = newMem;
updateSize();
int neededSize = newActiveWords * Bytes32.SIZE;
if (neededSize > memBytes.length) {
int newSize = Math.max(neededSize, memBytes.length * 2);
byte[] newMem = new byte[newSize];
System.arraycopy(memBytes, 0, newMem, 0, memBytes.length);
memBytes = newMem;
}
activeWords = newActiveWords;
}
/**
@@ -170,7 +168,7 @@ public class Memory {
* @return The current number of active bytes stored in memory.
*/
int getActiveBytes() {
return memBytes.length;
return activeWords * Bytes32.SIZE;
}
/**