core, eth: unship EIP 2315

core/vm/contract.go

@@ -96,19 +96,6 @@ func (c *Contract) validJumpdest(dest *uint256.Int) bool {
 	return c.isCode(udest)
 }
 
-func (c *Contract) validJumpSubdest(udest uint64) bool {
-	// PC cannot go beyond len(code) and certainly can't be bigger than 63 bits.
-	// Don't bother checking for BEGINSUB in that case.
-	if int64(udest) < 0 || udest >= uint64(len(c.Code)) {
-		return false
-	}
-	// Only BEGINSUBs allowed for destinations
-	if OpCode(c.Code[udest]) != BEGINSUB {
-		return false
-	}
-	return c.isCode(udest)
-}
-
 // isCode returns true if the provided PC location is an actual opcode, as
 // opposed to a data-segment following a PUSHN operation.
 func (c *Contract) isCode(udest uint64) bool {

core/vm/eips.go

@@ -29,7 +29,6 @@ var activators = map[int]func(*JumpTable){
 	2200: enable2200,
 	1884: enable1884,
 	1344: enable1344,
-	2315: enable2315,
 }
 
 // EnableEIP enables the given EIP on the config.
@@ -108,34 +107,6 @@ func enable2200(jt *JumpTable) {
 	jt[SSTORE].dynamicGas = gasSStoreEIP2200
 }
 
-// enable2315 applies EIP-2315 (Simple Subroutines)
-// - Adds opcodes that jump to and return from subroutines
-func enable2315(jt *JumpTable) {
-	// New opcode
-	jt[BEGINSUB] = &operation{
-		execute:     opBeginSub,
-		constantGas: GasQuickStep,
-		minStack:    minStack(0, 0),
-		maxStack:    maxStack(0, 0),
-	}
-	// New opcode
-	jt[JUMPSUB] = &operation{
-		execute:     opJumpSub,
-		constantGas: GasSlowStep,
-		minStack:    minStack(1, 0),
-		maxStack:    maxStack(1, 0),
-		jumps:       true,
-	}
-	// New opcode
-	jt[RETURNSUB] = &operation{
-		execute:     opReturnSub,
-		constantGas: GasFastStep,
-		minStack:    minStack(0, 0),
-		maxStack:    maxStack(0, 0),
-		jumps:       true,
-	}
-}
-
 // enable2929 enables "EIP-2929: Gas cost increases for state access opcodes"
 // https://eips.ethereum.org/EIPS/eip-2929
 func enable2929(jt *JumpTable) {

core/vm/instructions.go

@@ -547,38 +547,6 @@ func opJumpdest(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) (
 	return nil, nil
 }
 
-func opBeginSub(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
-	return nil, ErrInvalidSubroutineEntry
-}
-
-func opJumpSub(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
-	if len(callContext.rstack.data) >= 1023 {
-		return nil, ErrReturnStackExceeded
-	}
-	pos := callContext.stack.pop()
-	if !pos.IsUint64() {
-		return nil, ErrInvalidJump
-	}
-	posU64 := pos.Uint64()
-	if !callContext.contract.validJumpSubdest(posU64) {
-		return nil, ErrInvalidJump
-	}
-	callContext.rstack.push(uint32(*pc))
-	*pc = posU64 + 1
-	return nil, nil
-}
-
-func opReturnSub(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
-	if len(callContext.rstack.data) == 0 {
-		return nil, ErrInvalidRetsub
-	}
-	// Other than the check that the return stack is not empty, there is no
-	// need to validate the pc from 'returns', since we only ever push valid
-	//values onto it via jumpsub.
-	*pc = uint64(callContext.rstack.pop()) + 1
-	return nil, nil
-}
-
 func opPc(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
 	callContext.stack.push(new(uint256.Int).SetUint64(*pc))
 	return nil, nil

core/vm/instructions_test.go

@@ -94,7 +94,6 @@ func testTwoOperandOp(t *testing.T, tests []TwoOperandTestcase, opFn executionFu
 	var (
 		env            = NewEVM(BlockContext{}, TxContext{}, nil, params.TestChainConfig, Config{})
 		stack          = newstack()
-		rstack         = newReturnStack()
 		pc             = uint64(0)
 		evmInterpreter = env.interpreter.(*EVMInterpreter)
 	)
@@ -105,7 +104,7 @@ func testTwoOperandOp(t *testing.T, tests []TwoOperandTestcase, opFn executionFu
 		expected := new(uint256.Int).SetBytes(common.Hex2Bytes(test.Expected))
 		stack.push(x)
 		stack.push(y)
-		opFn(&pc, evmInterpreter, &callCtx{nil, stack, rstack, nil})
+		opFn(&pc, evmInterpreter, &callCtx{nil, stack, nil})
 		if len(stack.data) != 1 {
 			t.Errorf("Expected one item on stack after %v, got %d: ", name, len(stack.data))
 		}
@@ -220,7 +219,7 @@ func TestAddMod(t *testing.T) {
 		stack.push(z)
 		stack.push(y)
 		stack.push(x)
-		opAddmod(&pc, evmInterpreter, &callCtx{nil, stack, nil, nil})
+		opAddmod(&pc, evmInterpreter, &callCtx{nil, stack, nil})
 		actual := stack.pop()
 		if actual.Cmp(expected) != 0 {
 			t.Errorf("Testcase %d, expected  %x, got %x", i, expected, actual)
@@ -231,18 +230,18 @@ func TestAddMod(t *testing.T) {
 // getResult is a convenience function to generate the expected values
 func getResult(args []*twoOperandParams, opFn executionFunc) []TwoOperandTestcase {
 	var (
-		env           = NewEVM(BlockContext{}, TxContext{}, nil, params.TestChainConfig, Config{})
-		stack, rstack = newstack(), newReturnStack()
-		pc            = uint64(0)
-		interpreter   = env.interpreter.(*EVMInterpreter)
+		env         = NewEVM(BlockContext{}, TxContext{}, nil, params.TestChainConfig, Config{})
+		stack       = newstack()
+		pc          = uint64(0)
+		interpreter = env.interpreter.(*EVMInterpreter)
 	)
 	result := make([]TwoOperandTestcase, len(args))
 	for i, param := range args {
 		x := new(uint256.Int).SetBytes(common.Hex2Bytes(param.x))
 		y := new(uint256.Int).SetBytes(common.Hex2Bytes(param.y))
 		stack.push(x)
 		stack.push(y)
-		opFn(&pc, interpreter, &callCtx{nil, stack, rstack, nil})
+		opFn(&pc, interpreter, &callCtx{nil, stack, nil})
 		actual := stack.pop()
 		result[i] = TwoOperandTestcase{param.x, param.y, fmt.Sprintf("%064x", actual)}
 	}
@@ -282,7 +281,7 @@ func TestJsonTestcases(t *testing.T) {
 func opBenchmark(bench *testing.B, op executionFunc, args ...string) {
 	var (
 		env            = NewEVM(BlockContext{}, TxContext{}, nil, params.TestChainConfig, Config{})
-		stack, rstack  = newstack(), newReturnStack()
+		stack          = newstack()
 		evmInterpreter = NewEVMInterpreter(env, env.vmConfig)
 	)
 
@@ -300,7 +299,7 @@ func opBenchmark(bench *testing.B, op executionFunc, args ...string) {
 			a.SetBytes(arg)
 			stack.push(a)
 		}
-		op(&pc, evmInterpreter, &callCtx{nil, stack, rstack, nil})
+		op(&pc, evmInterpreter, &callCtx{nil, stack, nil})
 		stack.pop()
 	}
 }
@@ -516,7 +515,7 @@ func BenchmarkOpIsZero(b *testing.B) {
 func TestOpMstore(t *testing.T) {
 	var (
 		env            = NewEVM(BlockContext{}, TxContext{}, nil, params.TestChainConfig, Config{})
-		stack, rstack  = newstack(), newReturnStack()
+		stack          = newstack()
 		mem            = NewMemory()
 		evmInterpreter = NewEVMInterpreter(env, env.vmConfig)
 	)
@@ -526,12 +525,12 @@ func TestOpMstore(t *testing.T) {
 	pc := uint64(0)
 	v := "abcdef00000000000000abba000000000deaf000000c0de00100000000133700"
 	stack.pushN(*new(uint256.Int).SetBytes(common.Hex2Bytes(v)), *new(uint256.Int))
-	opMstore(&pc, evmInterpreter, &callCtx{mem, stack, rstack, nil})
+	opMstore(&pc, evmInterpreter, &callCtx{mem, stack, nil})
 	if got := common.Bytes2Hex(mem.GetCopy(0, 32)); got != v {
 		t.Fatalf("Mstore fail, got %v, expected %v", got, v)
 	}
 	stack.pushN(*new(uint256.Int).SetUint64(0x1), *new(uint256.Int))
-	opMstore(&pc, evmInterpreter, &callCtx{mem, stack, rstack, nil})
+	opMstore(&pc, evmInterpreter, &callCtx{mem, stack, nil})
 	if common.Bytes2Hex(mem.GetCopy(0, 32)) != "0000000000000000000000000000000000000000000000000000000000000001" {
 		t.Fatalf("Mstore failed to overwrite previous value")
 	}
@@ -540,7 +539,7 @@ func TestOpMstore(t *testing.T) {
 func BenchmarkOpMstore(bench *testing.B) {
 	var (
 		env            = NewEVM(BlockContext{}, TxContext{}, nil, params.TestChainConfig, Config{})
-		stack, rstack  = newstack(), newReturnStack()
+		stack          = newstack()
 		mem            = NewMemory()
 		evmInterpreter = NewEVMInterpreter(env, env.vmConfig)
 	)
@@ -554,14 +553,14 @@ func BenchmarkOpMstore(bench *testing.B) {
 	bench.ResetTimer()
 	for i := 0; i < bench.N; i++ {
 		stack.pushN(*value, *memStart)
-		opMstore(&pc, evmInterpreter, &callCtx{mem, stack, rstack, nil})
+		opMstore(&pc, evmInterpreter, &callCtx{mem, stack, nil})
 	}
 }
 
 func BenchmarkOpSHA3(bench *testing.B) {
 	var (
 		env            = NewEVM(BlockContext{}, TxContext{}, nil, params.TestChainConfig, Config{})
-		stack, rstack  = newstack(), newReturnStack()
+		stack          = newstack()
 		mem            = NewMemory()
 		evmInterpreter = NewEVMInterpreter(env, env.vmConfig)
 	)
@@ -573,7 +572,7 @@ func BenchmarkOpSHA3(bench *testing.B) {
 	bench.ResetTimer()
 	for i := 0; i < bench.N; i++ {
 		stack.pushN(*uint256.NewInt().SetUint64(32), *start)
-		opSha3(&pc, evmInterpreter, &callCtx{mem, stack, rstack, nil})
+		opSha3(&pc, evmInterpreter, &callCtx{mem, stack, nil})
 	}
 }
 

core/vm/interpreter.go

@@ -67,7 +67,6 @@ type Interpreter interface {
 type callCtx struct {
 	memory   *Memory
 	stack    *Stack
-	rstack   *ReturnStack
 	contract *Contract
 }
 
@@ -161,14 +160,12 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
 	}
 
 	var (
-		op          OpCode             // current opcode
-		mem         = NewMemory()      // bound memory
-		stack       = newstack()       // local stack
-		returns     = newReturnStack() // local returns stack
+		op          OpCode        // current opcode
+		mem         = NewMemory() // bound memory
+		stack       = newstack()  // local stack
 		callContext = &callCtx{
 			memory:   mem,
 			stack:    stack,
-			rstack:   returns,
 			contract: contract,
 		}
 		// For optimisation reason we're using uint64 as the program counter.
@@ -187,17 +184,16 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
 	// they are returned to the pools
 	defer func() {
 		returnStack(stack)
-		returnRStack(returns)
 	}()
 	contract.Input = input
 
 	if in.cfg.Debug {
 		defer func() {
 			if err != nil {
 				if !logged {
-					in.cfg.Tracer.CaptureState(in.evm, pcCopy, op, gasCopy, cost, mem, stack, returns, in.returnData, contract, in.evm.depth, err)
+					in.cfg.Tracer.CaptureState(in.evm, pcCopy, op, gasCopy, cost, mem, stack, in.returnData, contract, in.evm.depth, err)
 				} else {
-					in.cfg.Tracer.CaptureFault(in.evm, pcCopy, op, gasCopy, cost, mem, stack, returns, contract, in.evm.depth, err)
+					in.cfg.Tracer.CaptureFault(in.evm, pcCopy, op, gasCopy, cost, mem, stack, contract, in.evm.depth, err)
 				}
 			}
 		}()
@@ -279,7 +275,7 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
 		}
 
 		if in.cfg.Debug {
-			in.cfg.Tracer.CaptureState(in.evm, pc, op, gasCopy, cost, mem, stack, returns, in.returnData, contract, in.evm.depth, err)
+			in.cfg.Tracer.CaptureState(in.evm, pc, op, gasCopy, cost, mem, stack, in.returnData, contract, in.evm.depth, err)
 			logged = true
 		}
 

core/vm/jump_table.go

@@ -66,7 +66,6 @@ type JumpTable [256]*operation
 // contantinople, istanbul, petersburg and berlin instructions.
 func newBerlinInstructionSet() JumpTable {
 	instructionSet := newIstanbulInstructionSet()
-	enable2315(&instructionSet) // Subroutines - https://eips.ethereum.org/EIPS/eip-2315
 	enable2929(&instructionSet) // Access lists for trie accesses https://eips.ethereum.org/EIPS/eip-2929
 	return instructionSet
 }