core/vm: use a callcontext struct (#20761)

* core/vm: use a callcontext struct

* core/vm: fix tests

* core/vm/runtime: benchmark

* core/vm: make intpool push inlineable, unexpose callcontext

core/vm/eips.go

@@ -60,9 +60,9 @@ func enable1884(jt *JumpTable) {
 	}
 }
 
-func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
-	balance := interpreter.intPool.get().Set(interpreter.evm.StateDB.GetBalance(contract.Address()))
-	stack.push(balance)
+func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
+	balance := interpreter.intPool.get().Set(interpreter.evm.StateDB.GetBalance(callContext.contract.Address()))
+	callContext.stack.push(balance)
 	return nil, nil
 }
 
@@ -80,9 +80,9 @@ func enable1344(jt *JumpTable) {
 }
 
 // opChainID implements CHAINID opcode
-func opChainID(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
+func opChainID(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
 	chainId := interpreter.intPool.get().Set(interpreter.evm.chainConfig.ChainID)
-	stack.push(chainId)
+	callContext.stack.push(chainId)
 	return nil, nil
 }
 

core/vm/instructions_test.go

@@ -109,7 +109,7 @@ func testTwoOperandOp(t *testing.T, tests []TwoOperandTestcase, opFn executionFu
 		expected := new(big.Int).SetBytes(common.Hex2Bytes(test.Expected))
 		stack.push(x)
 		stack.push(y)
-		opFn(&pc, evmInterpreter, nil, nil, stack)
+		opFn(&pc, evmInterpreter, &callCtx{nil, stack, nil})
 		actual := stack.pop()
 
 		if actual.Cmp(expected) != 0 {
@@ -223,7 +223,7 @@ func getResult(args []*twoOperandParams, opFn executionFunc) []TwoOperandTestcas
 		y := new(big.Int).SetBytes(common.Hex2Bytes(param.y))
 		stack.push(x)
 		stack.push(y)
-		opFn(&pc, interpreter, nil, nil, stack)
+		opFn(&pc, interpreter, &callCtx{nil, stack, nil})
 		actual := stack.pop()
 		result[i] = TwoOperandTestcase{param.x, param.y, fmt.Sprintf("%064x", actual)}
 	}
@@ -260,7 +260,7 @@ func TestJsonTestcases(t *testing.T) {
 	}
 }
 
-func opBenchmark(bench *testing.B, op func(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error), args ...string) {
+func opBenchmark(bench *testing.B, op executionFunc, args ...string) {
 	var (
 		env            = NewEVM(Context{}, nil, params.TestChainConfig, Config{})
 		stack          = newstack()
@@ -281,7 +281,7 @@ func opBenchmark(bench *testing.B, op func(pc *uint64, interpreter *EVMInterpret
 			a := new(big.Int).SetBytes(arg)
 			stack.push(a)
 		}
-		op(&pc, evmInterpreter, nil, nil, stack)
+		op(&pc, evmInterpreter, &callCtx{nil, stack, nil})
 		stack.pop()
 	}
 	poolOfIntPools.put(evmInterpreter.intPool)
@@ -509,12 +509,12 @@ func TestOpMstore(t *testing.T) {
 	pc := uint64(0)
 	v := "abcdef00000000000000abba000000000deaf000000c0de00100000000133700"
 	stack.pushN(new(big.Int).SetBytes(common.Hex2Bytes(v)), big.NewInt(0))
-	opMstore(&pc, evmInterpreter, nil, mem, stack)
+	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(big.NewInt(0x1), big.NewInt(0))
-	opMstore(&pc, evmInterpreter, nil, mem, stack)
+	opMstore(&pc, evmInterpreter, &callCtx{mem, stack, nil})
 	if common.Bytes2Hex(mem.GetCopy(0, 32)) != "0000000000000000000000000000000000000000000000000000000000000001" {
 		t.Fatalf("Mstore failed to overwrite previous value")
 	}
@@ -539,7 +539,7 @@ func BenchmarkOpMstore(bench *testing.B) {
 	bench.ResetTimer()
 	for i := 0; i < bench.N; i++ {
 		stack.pushN(value, memStart)
-		opMstore(&pc, evmInterpreter, nil, mem, stack)
+		opMstore(&pc, evmInterpreter, &callCtx{mem, stack, nil})
 	}
 	poolOfIntPools.put(evmInterpreter.intPool)
 }
@@ -560,7 +560,7 @@ func BenchmarkOpSHA3(bench *testing.B) {
 	bench.ResetTimer()
 	for i := 0; i < bench.N; i++ {
 		stack.pushN(big.NewInt(32), start)
-		opSha3(&pc, evmInterpreter, nil, mem, stack)
+		opSha3(&pc, evmInterpreter, &callCtx{mem, stack, nil})
 	}
 	poolOfIntPools.put(evmInterpreter.intPool)
 }

core/vm/interpreter.go

@@ -63,6 +63,14 @@ type Interpreter interface {
 	CanRun([]byte) bool
 }
 
+// callCtx contains the things that are per-call, such as stack and memory,
+// but not transients like pc and gas
+type callCtx struct {
+	memory   *Memory
+	stack    *Stack
+	contract *Contract
+}
+
 // keccakState wraps sha3.state. In addition to the usual hash methods, it also supports
 // Read to get a variable amount of data from the hash state. Read is faster than Sum
 // because it doesn't copy the internal state, but also modifies the internal state.
@@ -163,6 +171,11 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
 		op          OpCode        // current opcode
 		mem         = NewMemory() // bound memory
 		stack       = newstack()  // local stack
+		callContext = &callCtx{
+			memory:   mem,
+			stack:    stack,
+			contract: contract,
+		}
 		// For optimisation reason we're using uint64 as the program counter.
 		// It's theoretically possible to go above 2^64. The YP defines the PC
 		// to be uint256. Practically much less so feasible.
@@ -194,7 +207,12 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
 	// explicit STOP, RETURN or SELFDESTRUCT is executed, an error occurred during
 	// the execution of one of the operations or until the done flag is set by the
 	// parent context.
-	for atomic.LoadInt32(&in.evm.abort) == 0 {
+	steps := 0
+	for {
+		steps++
+		if steps%1000 == 0 && atomic.LoadInt32(&in.evm.abort) != 0 {
+			break
+		}
 		if in.cfg.Debug {
 			// Capture pre-execution values for tracing.
 			logged, pcCopy, gasCopy = false, pc, contract.Gas
@@ -267,7 +285,7 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
 		}
 
 		// execute the operation
-		res, err = operation.execute(&pc, in, contract, mem, stack)
+		res, err = operation.execute(&pc, in, callContext)
 		// verifyPool is a build flag. Pool verification makes sure the integrity
 		// of the integer pool by comparing values to a default value.
 		if verifyPool {

core/vm/intpool.go

@@ -53,6 +53,17 @@ func (p *intPool) getZero() *big.Int {
 	return new(big.Int)
 }
 
+// putOne returns an allocated big int to the pool to be later reused by get calls.
+// Note, the values as saved as is; neither put nor get zeroes the ints out!
+// As opposed to 'put' with variadic args, this method becomes inlined by the
+// go compiler
+func (p *intPool) putOne(i *big.Int) {
+	if len(p.pool.data) > poolLimit {
+		return
+	}
+	p.pool.push(i)
+}
+
 // put returns an allocated big int to the pool to be later reused by get calls.
 // Note, the values as saved as is; neither put nor get zeroes the ints out!
 func (p *intPool) put(is ...*big.Int) {

core/vm/jump_table.go

@@ -23,7 +23,7 @@ import (
 )
 
 type (
-	executionFunc func(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error)
+	executionFunc func(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error)
 	gasFunc       func(*EVM, *Contract, *Stack, *Memory, uint64) (uint64, error) // last parameter is the requested memory size as a uint64
 	// memorySizeFunc returns the required size, and whether the operation overflowed a uint64
 	memorySizeFunc func(*Stack) (size uint64, overflow bool)

core/vm/runtime/runtime_test.go

@@ -316,3 +316,31 @@ func TestBlockhash(t *testing.T) {
 		t.Errorf("suboptimal; too much chain iteration, expected %d, got %d", exp, got)
 	}
 }
+
+// BenchmarkSimpleLoop test a pretty simple loop which loops
+// 1M (1 048 575) times.
+// Takes about 200 ms
+func BenchmarkSimpleLoop(b *testing.B) {
+	// 0xfffff = 1048575 loops
+	code := []byte{
+		byte(vm.PUSH3), 0x0f, 0xff, 0xff,
+		byte(vm.JUMPDEST), //  [ count ]
+		byte(vm.PUSH1), 1, // [count, 1]
+		byte(vm.SWAP1),    // [1, count]
+		byte(vm.SUB),      // [ count -1 ]
+		byte(vm.DUP1),     //  [ count -1 , count-1]
+		byte(vm.PUSH1), 4, // [count-1, count -1, label]
+		byte(vm.JUMPI), // [ 0 ]
+		byte(vm.STOP),
+	}
+	//tracer := vm.NewJSONLogger(nil, os.Stdout)
+	//Execute(code, nil, &Config{
+	//	EVMConfig: vm.Config{
+	//		Debug:  true,
+	//		Tracer: tracer,
+	//	}})
+
+	for i := 0; i < b.N; i++ {
+		Execute(code, nil, nil)
+	}
+}