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core/vm: implement EIP-5656, mcopy instruction (#26181)

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Implements [EIP 5656](https://eips.ethereum.org/EIPS/eip-5656), MCOPY instruction, and enables it for Cancun. 

---------

Co-authored-by: Martin Holst Swende <martin@swende.se>
This commit is contained in:
Charles Cooper 2023-07-11 03:55:34 -04:00 committed by GitHub
parent af8b138c1a
commit 5c9cbc218a
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 262 additions and 1 deletions
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27
core/vm/eips.go
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@ -26,6 +26,7 @@ import (
)
var activators = map[int]func(*JumpTable){
5656: enable5656,
3855: enable3855,
3860: enable3860,
3529: enable3529,
@ -242,6 +243,32 @@ func enable3860(jt *JumpTable) {
jt[CREATE2].dynamicGas = gasCreate2Eip3860
}
// enable5656 enables EIP-5656 (MCOPY opcode)
// https://eips.ethereum.org/EIPS/eip-5656
func enable5656(jt *JumpTable) {
jt[MCOPY] = &operation{
execute: opMcopy,
constantGas: GasFastestStep,
dynamicGas: gasMcopy,
minStack: minStack(3, 0),
maxStack: maxStack(3, 0),
memorySize: memoryMcopy,
}
}
// opMcopy implements the MCOPY opcode (https://eips.ethereum.org/EIPS/eip-5656)
func opMcopy(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
var (
dst = scope.Stack.pop()
src = scope.Stack.pop()
length = scope.Stack.pop()
)
// These values are checked for overflow during memory expansion calculation
// (the memorySize function on the opcode).
scope.Memory.Copy(dst.Uint64(), src.Uint64(), length.Uint64())
return nil, nil
}
// opBlobHash implements the BLOBHASH opcode
func opBlobHash(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
index := scope.Stack.peek()

2
core/vm/gas_table.go
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@ -60,6 +60,7 @@ func memoryGasCost(mem *Memory, newMemSize uint64) (uint64, error) {
// as argument:
// CALLDATACOPY (stack position 2)
// CODECOPY (stack position 2)
// MCOPY (stack position 2)
// EXTCODECOPY (stack position 3)
// RETURNDATACOPY (stack position 2)
func memoryCopierGas(stackpos int) gasFunc {
@ -89,6 +90,7 @@ func memoryCopierGas(stackpos int) gasFunc {
var (
gasCallDataCopy = memoryCopierGas(2)
gasCodeCopy = memoryCopierGas(2)
gasMcopy = memoryCopierGas(2)
gasExtCodeCopy = memoryCopierGas(3)
gasReturnDataCopy = memoryCopierGas(2)
)

140
core/vm/instructions_test.go
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@ -22,9 +22,11 @@ import (
"fmt"
"math/big"
"os"
"strings"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
@ -788,3 +790,141 @@ func TestBlobHash(t *testing.T) {
}
}
}
func TestOpMCopy(t *testing.T) {
// Test cases from https://eips.ethereum.org/EIPS/eip-5656#test-cases
for i, tc := range []struct {
dst, src, len string
pre string
want string
wantGas uint64
}{
{ // MCOPY 0 32 32 - copy 32 bytes from offset 32 to offset 0.
dst: "0x0", src: "0x20", len: "0x20",
pre: "0000000000000000000000000000000000000000000000000000000000000000 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
want: "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
wantGas: 6,
},
{ // MCOPY 0 0 32 - copy 32 bytes from offset 0 to offset 0.
dst: "0x0", src: "0x0", len: "0x20",
pre: "0101010101010101010101010101010101010101010101010101010101010101",
want: "0101010101010101010101010101010101010101010101010101010101010101",
wantGas: 6,
},
{ // MCOPY 0 1 8 - copy 8 bytes from offset 1 to offset 0 (overlapping).
dst: "0x0", src: "0x1", len: "0x8",
pre: "000102030405060708 000000000000000000000000000000000000000000000000",
want: "010203040506070808 000000000000000000000000000000000000000000000000",
wantGas: 6,
},
{ // MCOPY 1 0 8 - copy 8 bytes from offset 0 to offset 1 (overlapping).
dst: "0x1", src: "0x0", len: "0x8",
pre: "000102030405060708 000000000000000000000000000000000000000000000000",
want: "000001020304050607 000000000000000000000000000000000000000000000000",
wantGas: 6,
},
// Tests below are not in the EIP, but maybe should be added
{ // MCOPY 0xFFFFFFFFFFFF 0xFFFFFFFFFFFF 0 - copy zero bytes from out-of-bounds index(overlapping).
dst: "0xFFFFFFFFFFFF", src: "0xFFFFFFFFFFFF", len: "0x0",
pre: "11",
want: "11",
wantGas: 3,
},
{ // MCOPY 0xFFFFFFFFFFFF 0 0 - copy zero bytes from start of mem to out-of-bounds.
dst: "0xFFFFFFFFFFFF", src: "0x0", len: "0x0",
pre: "11",
want: "11",
wantGas: 3,
},
{ // MCOPY 0 0xFFFFFFFFFFFF 0 - copy zero bytes from out-of-bounds to start of mem
dst: "0x0", src: "0xFFFFFFFFFFFF", len: "0x0",
pre: "11",
want: "11",
wantGas: 3,
},
{ // MCOPY - copy 1 from space outside of uint64 space
dst: "0x0", src: "0x10000000000000000", len: "0x1",
pre: "0",
},
{ // MCOPY - copy 1 from 0 to space outside of uint64
dst: "0x10000000000000000", src: "0x0", len: "0x1",
pre: "0",
},
{ // MCOPY - copy nothing from 0 to space outside of uint64
dst: "0x10000000000000000", src: "0x0", len: "0x0",
pre: "",
want: "",
wantGas: 3,
},
{ // MCOPY - copy 1 from 0x20 to 0x10, with no prior allocated mem
dst: "0x10", src: "0x20", len: "0x1",
pre: "",
// 64 bytes
want: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
wantGas: 12,
},
{ // MCOPY - copy 1 from 0x19 to 0x10, with no prior allocated mem
dst: "0x10", src: "0x19", len: "0x1",
pre: "",
// 32 bytes
want: "0x0000000000000000000000000000000000000000000000000000000000000000",
wantGas: 9,
},
} {
var (
env = NewEVM(BlockContext{}, TxContext{}, nil, params.TestChainConfig, Config{})
stack = newstack()
pc = uint64(0)
evmInterpreter = env.interpreter
)
data := common.FromHex(strings.ReplaceAll(tc.pre, " ", ""))
// Set pre
mem := NewMemory()
mem.Resize(uint64(len(data)))
mem.Set(0, uint64(len(data)), data)
// Push stack args
len, _ := uint256.FromHex(tc.len)
src, _ := uint256.FromHex(tc.src)
dst, _ := uint256.FromHex(tc.dst)
stack.push(len)
stack.push(src)
stack.push(dst)
wantErr := (tc.wantGas == 0)
// Calc mem expansion
var memorySize uint64
if memSize, overflow := memoryMcopy(stack); overflow {
if wantErr {
continue
}
t.Errorf("overflow")
} else {
var overflow bool
if memorySize, overflow = math.SafeMul(toWordSize(memSize), 32); overflow {
t.Error(ErrGasUintOverflow)
}
}
// and the dynamic cost
var haveGas uint64
if dynamicCost, err := gasMcopy(env, nil, stack, mem, memorySize); err != nil {
t.Error(err)
} else {
haveGas = GasFastestStep + dynamicCost
}
// Expand mem
if memorySize > 0 {
mem.Resize(memorySize)
}
// Do the copy
opMcopy(&pc, evmInterpreter, &ScopeContext{mem, stack, nil})
want := common.FromHex(strings.ReplaceAll(tc.want, " ", ""))
if have := mem.store; !bytes.Equal(want, have) {
t.Errorf("case %d: \nwant: %#x\nhave: %#x\n", i, want, have)
}
wantGas := tc.wantGas
if haveGas != wantGas {
t.Errorf("case %d: gas wrong, want %d have %d\n", i, wantGas, haveGas)
}
}
}

3
core/vm/jump_table.go
View File

@ -82,8 +82,9 @@ func validate(jt JumpTable) JumpTable {
func newCancunInstructionSet() JumpTable {
instructionSet := newShanghaiInstructionSet()
enable4844(&instructionSet) // BLOBHASH opcode
enable4844(&instructionSet) // EIP-4844 (DATAHASH opcode)
enable1153(&instructionSet) // EIP-1153 "Transient Storage"
enable5656(&instructionSet) // EIP-5656 (MCOPY opcode)
return validate(instructionSet)
}

11
core/vm/memory.go
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@ -103,3 +103,14 @@ func (m *Memory) Len() int {
func (m *Memory) Data() []byte {
return m.store
}
// Copy copies data from the src position slice into the dst position.
// The source and destination may overlap.
// OBS: This operation assumes that any necessary memory expansion has already been performed,
// and this method may panic otherwise.
func (m *Memory) Copy(dst, src, len uint64) {
if len == 0 {
return
}
copy(m.store[dst:], m.store[src:src+len])
}

8
core/vm/memory_table.go
View File

@ -48,6 +48,14 @@ func memoryMStore(stack *Stack) (uint64, bool) {
return calcMemSize64WithUint(stack.Back(0), 32)
}
func memoryMcopy(stack *Stack) (uint64, bool) {
mStart := stack.Back(0) // stack[0]: dest
if stack.Back(1).Gt(mStart) {
mStart = stack.Back(1) // stack[1]: source
}
return calcMemSize64(mStart, stack.Back(2)) // stack[2]: length
}
func memoryCreate(stack *Stack) (uint64, bool) {
return calcMemSize64(stack.Back(1), stack.Back(2))
}

69
core/vm/memory_test.go Normal file
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@ -0,0 +1,69 @@
package vm
import (
"bytes"
"strings"
"testing"
"github.com/ethereum/go-ethereum/common"
)
func TestMemoryCopy(t *testing.T) {
// Test cases from https://eips.ethereum.org/EIPS/eip-5656#test-cases
for i, tc := range []struct {
dst, src, len uint64
pre string
want string
}{
{ // MCOPY 0 32 32 - copy 32 bytes from offset 32 to offset 0.
0, 32, 32,
"0000000000000000000000000000000000000000000000000000000000000000 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f",
},
{ // MCOPY 0 0 32 - copy 32 bytes from offset 0 to offset 0.
0, 0, 32,
"0101010101010101010101010101010101010101010101010101010101010101",
"0101010101010101010101010101010101010101010101010101010101010101",
},
{ // MCOPY 0 1 8 - copy 8 bytes from offset 1 to offset 0 (overlapping).
0, 1, 8,
"000102030405060708 000000000000000000000000000000000000000000000000",
"010203040506070808 000000000000000000000000000000000000000000000000",
},
{ // MCOPY 1 0 8 - copy 8 bytes from offset 0 to offset 1 (overlapping).
1, 0, 8,
"000102030405060708 000000000000000000000000000000000000000000000000",
"000001020304050607 000000000000000000000000000000000000000000000000",
},
// Tests below are not in the EIP, but maybe should be added
{ // MCOPY 0xFFFFFFFFFFFF 0xFFFFFFFFFFFF 0 - copy zero bytes from out-of-bounds index(overlapping).
0xFFFFFFFFFFFF, 0xFFFFFFFFFFFF, 0,
"11",
"11",
},
{ // MCOPY 0xFFFFFFFFFFFF 0 0 - copy zero bytes from start of mem to out-of-bounds.
0xFFFFFFFFFFFF, 0, 0,
"11",
"11",
},
{ // MCOPY 0 0xFFFFFFFFFFFF 0 - copy zero bytes from out-of-bounds to start of mem
0, 0xFFFFFFFFFFFF, 0,
"11",
"11",
},
} {
m := NewMemory()
// Clean spaces
data := common.FromHex(strings.ReplaceAll(tc.pre, " ", ""))
// Set pre
m.Resize(uint64(len(data)))
m.Set(0, uint64(len(data)), data)
// Do the copy
m.Copy(tc.dst, tc.src, tc.len)
want := common.FromHex(strings.ReplaceAll(tc.want, " ", ""))
if have := m.store; !bytes.Equal(want, have) {
t.Errorf("case %d: want: %#x\nhave: %#x\n", i, want, have)
}
}
}

3
core/vm/opcodes.go
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@ -119,6 +119,7 @@ const (
JUMPDEST OpCode = 0x5b
TLOAD OpCode = 0x5c
TSTORE OpCode = 0x5d
MCOPY OpCode = 0x5e
PUSH0 OpCode = 0x5f
)
@ -302,6 +303,7 @@ var opCodeToString = map[OpCode]string{
JUMPDEST: "JUMPDEST",
TLOAD: "TLOAD",
TSTORE: "TSTORE",
MCOPY: "MCOPY",
PUSH0: "PUSH0",
// 0x60 range - pushes.
@ -473,6 +475,7 @@ var stringToOp = map[string]OpCode{
"JUMPDEST": JUMPDEST,
"TLOAD": TLOAD,
"TSTORE": TSTORE,
"MCOPY": MCOPY,
"PUSH0": PUSH0,
"PUSH1": PUSH1,
"PUSH2": PUSH2,