github.com/theQRL/go-zond@v0.1.1/core/vm/memory_test.go (about)

     1  package vm
     2  
     3  import (
     4  	"bytes"
     5  	"strings"
     6  	"testing"
     7  
     8  	"github.com/theQRL/go-zond/common"
     9  )
    10  
    11  func TestMemoryCopy(t *testing.T) {
    12  	// Test cases from https://eips.ethereum.org/EIPS/eip-5656#test-cases
    13  	for i, tc := range []struct {
    14  		dst, src, len uint64
    15  		pre           string
    16  		want          string
    17  	}{
    18  		{ // MCOPY 0 32 32 - copy 32 bytes from offset 32 to offset 0.
    19  			0, 32, 32,
    20  			"0000000000000000000000000000000000000000000000000000000000000000 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
    21  			"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
    22  		},
    23  
    24  		{ // MCOPY 0 0 32 - copy 32 bytes from offset 0 to offset 0.
    25  			0, 0, 32,
    26  			"0101010101010101010101010101010101010101010101010101010101010101",
    27  			"0101010101010101010101010101010101010101010101010101010101010101",
    28  		},
    29  		{ // MCOPY 0 1 8 - copy 8 bytes from offset 1 to offset 0 (overlapping).
    30  			0, 1, 8,
    31  			"000102030405060708 000000000000000000000000000000000000000000000000",
    32  			"010203040506070808 000000000000000000000000000000000000000000000000",
    33  		},
    34  		{ // MCOPY 1 0 8 - copy 8 bytes from offset 0 to offset 1 (overlapping).
    35  			1, 0, 8,
    36  			"000102030405060708 000000000000000000000000000000000000000000000000",
    37  			"000001020304050607 000000000000000000000000000000000000000000000000",
    38  		},
    39  		// Tests below are not in the EIP, but maybe should be added
    40  		{ // MCOPY 0xFFFFFFFFFFFF 0xFFFFFFFFFFFF 0 - copy zero bytes from out-of-bounds index(overlapping).
    41  			0xFFFFFFFFFFFF, 0xFFFFFFFFFFFF, 0,
    42  			"11",
    43  			"11",
    44  		},
    45  		{ // MCOPY 0xFFFFFFFFFFFF 0 0 - copy zero bytes from start of mem to out-of-bounds.
    46  			0xFFFFFFFFFFFF, 0, 0,
    47  			"11",
    48  			"11",
    49  		},
    50  		{ // MCOPY 0 0xFFFFFFFFFFFF 0 - copy zero bytes from out-of-bounds to start of mem
    51  			0, 0xFFFFFFFFFFFF, 0,
    52  			"11",
    53  			"11",
    54  		},
    55  	} {
    56  		m := NewMemory()
    57  		// Clean spaces
    58  		data := common.FromHex(strings.ReplaceAll(tc.pre, " ", ""))
    59  		// Set pre
    60  		m.Resize(uint64(len(data)))
    61  		m.Set(0, uint64(len(data)), data)
    62  		// Do the copy
    63  		m.Copy(tc.dst, tc.src, tc.len)
    64  		want := common.FromHex(strings.ReplaceAll(tc.want, " ", ""))
    65  		if have := m.store; !bytes.Equal(want, have) {
    66  			t.Errorf("case %d: want: %#x\nhave: %#x\n", i, want, have)
    67  		}
    68  	}
    69  }