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Migrate Operand Stack to Growing Stack (hyperledger#6068)
To improve the performance of CALL operations move the OperandStack and ReturnStack to growing stacks instead of a fully allocated stack. Signed-off-by: Danno Ferrin <[email protected]>
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253 changes: 253 additions & 0 deletions
253
evm/src/main/java/org/hyperledger/besu/evm/internal/FlexStack.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,253 @@ | ||
| /* | ||
| * Copyright contributors to Hyperledger Besu | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on | ||
| * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations under the License. | ||
| * | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
| package org.hyperledger.besu.evm.internal; | ||
|
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| import static com.google.common.base.Preconditions.checkArgument; | ||
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| import java.lang.reflect.Array; | ||
| import java.util.Arrays; | ||
| import java.util.Objects; | ||
|
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| /** | ||
| * An operand stack for the Ethereum Virtual machine (EVM). The stack grows 32 entries at a time if | ||
| * it expands past the top of the allocated stack, up to maxSize. | ||
| * | ||
| * <p>The operand stack is responsible for storing the current operands that the EVM can execute. It | ||
| * is assumed to have a fixed maximum size but may have a smaller memory footprint. | ||
| * | ||
| * @param <T> the type parameter | ||
| */ | ||
| public class FlexStack<T> { | ||
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| private static final int INCREMENT = 32; | ||
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| private T[] entries; | ||
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| private final int maxSize; | ||
| private int currentCapacity; | ||
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| private int top; | ||
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| /** | ||
| * Instantiates a new Flex stack. | ||
| * | ||
| * @param maxSize the max size | ||
| * @param klass the klass | ||
| */ | ||
| @SuppressWarnings("unchecked") | ||
| public FlexStack(final int maxSize, final Class<T> klass) { | ||
| checkArgument(maxSize > 0, "max size must be positive"); | ||
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| this.currentCapacity = Math.min(INCREMENT, maxSize); | ||
| this.entries = (T[]) Array.newInstance(klass, currentCapacity); | ||
| this.maxSize = maxSize; | ||
| this.top = -1; | ||
| } | ||
|
|
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| /** | ||
| * Get operand. | ||
| * | ||
| * @param offset the offset | ||
| * @return the operand | ||
| */ | ||
| public T get(final int offset) { | ||
| if (offset < 0 || offset >= size()) { | ||
| throw new UnderflowException(); | ||
| } | ||
|
|
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| return entries[top - offset]; | ||
| } | ||
|
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| /** | ||
| * Pop operand. | ||
| * | ||
| * @return the operand | ||
| */ | ||
| public T pop() { | ||
| if (top < 0) { | ||
| throw new UnderflowException(); | ||
| } | ||
|
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| final T removed = entries[top]; | ||
| entries[top--] = null; | ||
| return removed; | ||
| } | ||
|
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| /** | ||
| * Peek and return type T. | ||
| * | ||
| * @return the T entry | ||
| */ | ||
| public T peek() { | ||
| if (top < 0) { | ||
| return null; | ||
| } else { | ||
| return entries[top]; | ||
| } | ||
| } | ||
|
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| /** | ||
| * Pops the specified number of operands from the stack. | ||
| * | ||
| * @param items the number of operands to pop off the stack | ||
| * @throws IllegalArgumentException if the items to pop is negative. | ||
| * @throws UnderflowException when the items to pop is greater than {@link #size()} | ||
| */ | ||
| public void bulkPop(final int items) { | ||
| checkArgument(items > 0, "number of items to pop must be greater than 0"); | ||
| if (items > size()) { | ||
| throw new UnderflowException(); | ||
| } | ||
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| Arrays.fill(entries, top - items + 1, top + 1, null); | ||
| top -= items; | ||
| } | ||
|
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| /** | ||
| * Trims the "middle" section of items out of the stack. Items below the cutpoint remains, and of | ||
| * the items above only the itemsToKeep items remain. All items in the middle are removed. | ||
| * | ||
| * @param cutPoint Point at which to start removing items | ||
| * @param itemsToKeep itemsToKeep Number of items on top to place at the cutPoint | ||
| * @throws IllegalArgumentException if the cutPoint or items to keep is negative. | ||
| * @throws UnderflowException If there are less than itemsToKeep above the cutPoint | ||
| */ | ||
| public void preserveTop(final int cutPoint, final int itemsToKeep) { | ||
| checkArgument(cutPoint >= 0, "cutPoint must be positive"); | ||
| checkArgument(itemsToKeep >= 0, "itemsToKeep must be positive"); | ||
| if (itemsToKeep == 0) { | ||
| if (cutPoint < size()) { | ||
| bulkPop(top - cutPoint); | ||
| } | ||
| } else { | ||
| int targetSize = cutPoint + itemsToKeep; | ||
| int currentSize = size(); | ||
| if (targetSize > currentSize) { | ||
| throw new UnderflowException(); | ||
| } else if (targetSize < currentSize) { | ||
| System.arraycopy(entries, currentSize - itemsToKeep, entries, cutPoint, itemsToKeep); | ||
| Arrays.fill(entries, targetSize, currentSize, null); | ||
| top = targetSize - 1; | ||
| } | ||
| } | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| private void expandEntries(final int nextSize) { | ||
| var nextEntries = (T[]) Array.newInstance(entries.getClass().getComponentType(), nextSize); | ||
| System.arraycopy(entries, 0, nextEntries, 0, currentCapacity); | ||
| entries = nextEntries; | ||
| currentCapacity = nextSize; | ||
| } | ||
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| /** | ||
| * Push operand. | ||
| * | ||
| * @param operand the operand | ||
| */ | ||
| public void push(final T operand) { | ||
| final int nextTop = top + 1; | ||
| if (nextTop >= maxSize) { | ||
| throw new OverflowException(); | ||
| } | ||
| if (nextTop >= currentCapacity) { | ||
| expandEntries(Math.min(currentCapacity + INCREMENT, maxSize)); | ||
| } | ||
| entries[nextTop] = operand; | ||
| top = nextTop; | ||
| } | ||
|
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| /** | ||
| * Set operand. | ||
| * | ||
| * @param offset the offset | ||
| * @param operand the operand | ||
| */ | ||
| public void set(final int offset, final T operand) { | ||
| if (offset < 0) { | ||
| throw new UnderflowException(); | ||
| } else if (offset > top) { | ||
| throw new OverflowException(); | ||
| } | ||
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| entries[top - offset] = operand; | ||
| } | ||
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| /** | ||
| * Size of entries. | ||
| * | ||
| * @return the size | ||
| */ | ||
| public int size() { | ||
| return top + 1; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| final StringBuilder builder = new StringBuilder(); | ||
| for (int i = 0; i < top; ++i) { | ||
| builder.append(String.format("%n0x%04X ", i)).append(entries[i]); | ||
| } | ||
| return builder.toString(); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| int result = 1; | ||
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| for (int i = 0; i < currentCapacity; i++) { | ||
| result = 31 * result + (entries[i] == null ? 0 : entries[i].hashCode()); | ||
| } | ||
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| return result; | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| @Override | ||
| public boolean equals(final Object other) { | ||
| if (!(other instanceof FlexStack)) { | ||
| return false; | ||
| } | ||
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| final FlexStack<T> that = (FlexStack<T>) other; | ||
| if (this.currentCapacity != that.currentCapacity) { | ||
| return false; | ||
| } | ||
| for (int i = 0; i < currentCapacity; i++) { | ||
| if (!Objects.deepEquals(this.entries[i], that.entries[i])) { | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
|
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| /** | ||
| * Is stack full. | ||
| * | ||
| * @return the boolean | ||
| */ | ||
| public boolean isFull() { | ||
| return top + 1 >= maxSize; | ||
| } | ||
|
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| /** | ||
| * Is stack empty. | ||
| * | ||
| * @return the boolean | ||
| */ | ||
| public boolean isEmpty() { | ||
| return top < 0; | ||
| } | ||
| } |
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34 changes: 34 additions & 0 deletions
34
evm/src/main/java/org/hyperledger/besu/evm/internal/OverflowException.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| /* | ||
| * Copyright contributors to Hyperledger Besu | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on | ||
| * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations under the License. | ||
| * | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
| package org.hyperledger.besu.evm.internal; | ||
|
|
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| /** | ||
| * Overflow exception for {@link FixedStack} and {@link FlexStack}. The main need for a separate | ||
| * class is to remove the stack trace generation as the exception is not used to signal a debuggable | ||
| * failure but instead an expected edge case the EVM should handle. | ||
| */ | ||
| public class OverflowException extends RuntimeException { | ||
|
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| /** | ||
| * Overload the stack trace fill in so no stack is filled in. This is done for performance reasons | ||
| * as this exception signals an expected corner case not a debuggable failure. | ||
| * | ||
| * @return the exception, with no stack trace filled in. | ||
| */ | ||
| @Override | ||
| public synchronized Throwable fillInStackTrace() { | ||
| return this; | ||
| } | ||
| } |
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