core/vm, rpc: added disasm to `ext_` RPC

core/vm/disasm.go

+package vm
+
+import "fmt"
+
+func Disasm(code []byte) []string {
+	var out []string
+	for pc := uint64(0); pc < uint64(len(code)); pc++ {
+		op := OpCode(code[pc])
+		out = append(out, op.String())
+
+		switch op {
+		case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
+			a := uint64(op) - uint64(PUSH1) + 1
+			out = append(out, fmt.Sprintf("0x%x", code[pc+1:pc+1+a]))
+
+			pc += a
+		}
+	}
+
+	return out
+}

rpc/api.go

@@ -6,6 +6,7 @@ import (
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
@@ -344,7 +345,6 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		return NewNotImplementedError(req.Method)
 
 	case "eth_compileSolidity":
-
 		solc, _ := api.xeth().Solc()
 		if solc == nil {
 			return NewNotAvailableError(req.Method, "solc (solidity compiler) not found")
@@ -562,6 +562,13 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 
 	case "eth_hashrate":
 		*reply = newHexNum(api.xeth().HashRate())
+	case "ext_disasm":
+		args := new(SourceArgs)
+		if err := json.Unmarshal(req.Params, &args); err != nil {
+			return err
+		}
+
+		*reply = vm.Disasm(common.FromHex(args.Source))
 
 	// case "eth_register":
 	// 	// Placeholder for actual type