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package mipsevm
import (
"bytes"
"crypto/rand"
"encoding/binary"
"encoding/json"
"io"
"strings"
"testing"
"github.com/stretchr/testify/require"
)
func TestMemoryMerkleProof(t *testing.T) {
t.Run("nearly empty tree", func(t *testing.T) {
m := NewMemory()
m.SetMemory(0x10000, 0xaabbccdd)
proof := m.MerkleProof(0x10000)
require.Equal(t, uint32(0xaabbccdd), binary.BigEndian.Uint32(proof[:4]))
for i := 0; i < 32-5; i++ {
require.Equal(t, zeroHashes[i][:], proof[32+i*32:32+i*32+32], "empty siblings")
}
})
t.Run("fuller tree", func(t *testing.T) {
m := NewMemory()
m.SetMemory(0x10000, 0xaabbccdd)
m.SetMemory(0x80004, 42)
m.SetMemory(0x13370000, 123)
root := m.MerkleRoot()
proof := m.MerkleProof(0x80004)
require.Equal(t, uint32(42), binary.BigEndian.Uint32(proof[4:8]))
node := *(*[32]byte)(proof[:32])
path := uint32(0x80004) >> 5
for i := 32; i < len(proof); i += 32 {
sib := *(*[32]byte)(proof[i : i+32])
if path&1 != 0 {
node = HashPair(sib, node)
} else {
node = HashPair(node, sib)
}
path >>= 1
}
require.Equal(t, root, node, "proof must verify")
})
}
func TestMemoryMerkleRoot(t *testing.T) {
t.Run("empty", func(t *testing.T) {
m := NewMemory()
root := m.MerkleRoot()
require.Equal(t, zeroHashes[32-5], root, "fully zeroed memory should have expected zero hash")
})
t.Run("empty page", func(t *testing.T) {
m := NewMemory()
m.SetMemory(0xF000, 0)
root := m.MerkleRoot()
require.Equal(t, zeroHashes[32-5], root, "fully zeroed memory should have expected zero hash")
})
t.Run("single page", func(t *testing.T) {
m := NewMemory()
m.SetMemory(0xF000, 1)
root := m.MerkleRoot()
require.NotEqual(t, zeroHashes[32-5], root, "non-zero memory")
})
t.Run("repeat zero", func(t *testing.T) {
m := NewMemory()
m.SetMemory(0xF000, 0)
m.SetMemory(0xF004, 0)
root := m.MerkleRoot()
require.Equal(t, zeroHashes[32-5], root, "zero still")
})
t.Run("two empty pages", func(t *testing.T) {
m := NewMemory()
m.SetMemory(PageSize*3, 0)
m.SetMemory(PageSize*10, 0)
root := m.MerkleRoot()
require.Equal(t, zeroHashes[32-5], root, "zero still")
})
t.Run("random few pages", func(t *testing.T) {
m := NewMemory()
m.SetMemory(PageSize*3, 1)
m.SetMemory(PageSize*5, 42)
m.SetMemory(PageSize*6, 123)
p3 := m.MerkleizeSubtree((1 << PageKeySize) | 3)
p5 := m.MerkleizeSubtree((1 << PageKeySize) | 5)
p6 := m.MerkleizeSubtree((1 << PageKeySize) | 6)
z := zeroHashes[PageAddrSize-5]
r1 := HashPair(
HashPair(
HashPair(z, z), // 0,1
HashPair(z, p3), // 2,3
),
HashPair(
HashPair(z, p5), // 4,5
HashPair(p6, z), // 6,7
),
)
r2 := m.MerkleizeSubtree(1 << (PageKeySize - 3))
require.Equal(t, r1, r2, "expecting manual page combination to match subtree merkle func")
})
t.Run("invalidate page", func(t *testing.T) {
m := NewMemory()
m.SetMemory(0xF000, 0)
require.Equal(t, zeroHashes[32-5], m.MerkleRoot(), "zero at first")
m.SetMemory(0xF004, 1)
require.NotEqual(t, zeroHashes[32-5], m.MerkleRoot(), "non-zero")
m.SetMemory(0xF004, 0)
require.Equal(t, zeroHashes[32-5], m.MerkleRoot(), "zero again")
})
}
func TestMemoryReadWrite(t *testing.T) {
t.Run("large random", func(t *testing.T) {
m := NewMemory()
data := make([]byte, 20_000)
_, err := rand.Read(data[:])
require.NoError(t, err)
require.NoError(t, m.SetMemoryRange(0, bytes.NewReader(data)))
for _, i := range []uint32{0, 4, 1000, 20_000 - 4} {
v := m.GetMemory(i)
expected := binary.BigEndian.Uint32(data[i : i+4])
require.Equalf(t, expected, v, "read at %d", i)
}
})
t.Run("repeat range", func(t *testing.T) {
m := NewMemory()
data := []byte(strings.Repeat("under the big bright yellow sun ", 40))
require.NoError(t, m.SetMemoryRange(0x1337, bytes.NewReader(data)))
res, err := io.ReadAll(m.ReadMemoryRange(0x1337-10, uint32(len(data)+20)))
require.NoError(t, err)
require.Equal(t, make([]byte, 10), res[:10], "empty start")
require.Equal(t, data, res[10:len(res)-10], "result")
require.Equal(t, make([]byte, 10), res[len(res)-10:], "empty end")
})
t.Run("read-write", func(t *testing.T) {
m := NewMemory()
m.SetMemory(12, 0xAABBCCDD)
require.Equal(t, uint32(0xAABBCCDD), m.GetMemory(12))
m.SetMemory(12, 0xAABB1CDD)
require.Equal(t, uint32(0xAABB1CDD), m.GetMemory(12))
})
t.Run("unaligned read", func(t *testing.T) {
m := NewMemory()
m.SetMemory(12, 0xAABBCCDD)
m.SetMemory(16, 0x11223344)
require.Panics(t, func() {
m.GetMemory(13)
})
require.Panics(t, func() {
m.GetMemory(14)
})
require.Panics(t, func() {
m.GetMemory(15)
})
require.Equal(t, uint32(0x11223344), m.GetMemory(16))
require.Equal(t, uint32(0), m.GetMemory(20))
require.Equal(t, uint32(0xAABBCCDD), m.GetMemory(12))
})
t.Run("unaligned write", func(t *testing.T) {
m := NewMemory()
m.SetMemory(12, 0xAABBCCDD)
require.Panics(t, func() {
m.SetMemory(13, 0x11223344)
})
require.Panics(t, func() {
m.SetMemory(14, 0x11223344)
})
require.Panics(t, func() {
m.SetMemory(15, 0x11223344)
})
require.Equal(t, uint32(0xAABBCCDD), m.GetMemory(12))
})
}
func TestMemoryJSON(t *testing.T) {
m := NewMemory()
m.SetMemory(8, 123)
dat, err := json.Marshal(m)
require.NoError(t, err)
var res Memory
require.NoError(t, json.Unmarshal(dat, &res))
require.Equal(t, uint32(123), res.GetMemory(8))
}