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 000000000..858ee684a
--- /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 a9a0ae609..6b37acb03 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