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core/vm: refactor memory resize #33056

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7e30dfb
core/vm: refactor memory resize
MariusVanDerWijden Oct 30, 2025
8c5a76e
core/vm: re-add doc
MariusVanDerWijden Oct 30, 2025
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6 changes: 5 additions & 1 deletion core/vm/memory.go
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,11 @@ func (m *Memory) Set32(offset uint64, val *uint256.Int) {
// Resize resizes the memory to size
func (m *Memory) Resize(size uint64) {
if uint64(m.Len()) < size {
m.store = append(m.store, make([]byte, size-uint64(m.Len()))...)
if uint64(cap(m.store)) > size {
m.store = m.store[:size]
} else {
m.store = append(m.store, make([]byte, size-uint64(m.Len()))...)
}
}
}

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7 changes: 7 additions & 0 deletions core/vm/memory_test.go
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Expand Up @@ -83,3 +83,10 @@ func TestMemoryCopy(t *testing.T) {
}
}
}

func BenchmarkResize(b *testing.B) {
memory := NewMemory()
for i := range b.N {
memory.Resize(uint64(i))
}
}
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