From 7381be8edb3bec412d31a97977174cf52eed8094 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Fri, 22 May 2015 15:38:46 +0200
Subject: [PATCH] core/vm, rpc: added disasm to `ext_` RPC

---
 core/vm/disasm.go | 21 +++++++++++++++++++++
 rpc/api.go        |  9 ++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 core/vm/disasm.go

diff --git a/core/vm/disasm.go b/core/vm/disasm.go
new file mode 100644
index 0000000000..858ee684aa
--- /dev/null
+++ b/core/vm/disasm.go
@@ -0,0 +1,21 @@
+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
+}
diff --git a/rpc/api.go b/rpc/api.go
index a9a0ae6093..6b37acb034 100644
--- a/rpc/api.go
+++ b/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