...

11 files changed, 1217 insertions, 0 deletions

diff --git a/eth/tracers/internal/tracers/4byte_tracer.js b/eth/tracers/internal/tracers/4byte_tracer.js
new file mode 100644
index 0000000..462b4ad
--- /dev/null
+++ b/eth/tracers/internal/tracers/4byte_tracer.js
@@ -0,0 +1,86 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// 4byteTracer searches for 4byte-identifiers, and collects them for post-processing.
+// It collects the methods identifiers along with the size of the supplied data, so
+// a reversed signature can be matched against the size of the data.
+//
+// Example:
+//   > debug.traceTransaction( "0x214e597e35da083692f5386141e69f47e973b2c56e7a8073b1ea08fd7571e9de", {tracer: "4byteTracer"})
+//   {
+//     0x27dc297e-128: 1,
+//     0x38cc4831-0: 2,
+//     0x524f3889-96: 1,
+//     0xadf59f99-288: 1,
+//     0xc281d19e-0: 1
+//   }
+{
+	// ids aggregates the 4byte ids found.
+	ids : {},
+
+	// callType returns 'false' for non-calls, or the peek-index for the first param
+	// after 'value', i.e. meminstart.
+	callType: function(opstr){
+		switch(opstr){
+		case "CALL": case "CALLCODE":
+			// gas, addr, val, memin, meminsz, memout, memoutsz
+			return 3; // stack ptr to memin
+
+		case "DELEGATECALL": case "STATICCALL":
+			// gas, addr, memin, meminsz, memout, memoutsz
+			return 2; // stack ptr to memin
+		}
+		return false;
+	},
+
+	// store save the given indentifier and datasize.
+	store: function(id, size){
+		var key = "" + toHex(id) + "-" + size;
+		this.ids[key] = this.ids[key] + 1 || 1;
+	},
+
+	// step is invoked for every opcode that the VM executes.
+	step: function(log, db) {
+		// Skip any opcodes that are not internal calls
+		var ct = this.callType(log.op.toString());
+		if (!ct) {
+			return;
+		}
+		// Skip any pre-compile invocations, those are just fancy opcodes
+		if (isPrecompiled(toAddress(log.stack.peek(1).toString(16)))) {
+			return;
+		}
+		// Gather internal call details
+		var inSz = log.stack.peek(ct + 1).valueOf();
+		if (inSz >= 4) {
+			var inOff = log.stack.peek(ct).valueOf();
+			this.store(log.memory.slice(inOff, inOff + 4), inSz-4);
+		}
+	},
+
+	// fault is invoked when the actual execution of an opcode fails.
+	fault: function(log, db) { },
+
+	// result is invoked when all the opcodes have been iterated over and returns
+	// the final result of the tracing.
+	result: function(ctx) {
+		// Save the outer calldata also
+		if (ctx.input.length >= 4) {
+			this.store(slice(ctx.input, 0, 4), ctx.input.length-4)
+		}
+		return this.ids;
+	},
+}
diff --git a/eth/tracers/internal/tracers/assets.go b/eth/tracers/internal/tracers/assets.go
new file mode 100644
index 0000000..d0a0bf7
--- /dev/null
+++ b/eth/tracers/internal/tracers/assets.go
@@ -0,0 +1,463 @@
+// Code generated by go-bindata. DO NOT EDIT.
+// sources:
+// 4byte_tracer.js (2.933kB)
+// bigram_tracer.js (1.712kB)
+// call_tracer.js (8.643kB)
+// evmdis_tracer.js (4.194kB)
+// noop_tracer.js (1.271kB)
+// opcount_tracer.js (1.372kB)
+// prestate_tracer.js (4.234kB)
+// trigram_tracer.js (1.788kB)
+// unigram_tracer.js (1.51kB)
+
+package tracers
+
+import (
+	"bytes"
+	"compress/gzip"
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+func bindataRead(data []byte, name string) ([]byte, error) {
+	gz, err := gzip.NewReader(bytes.NewBuffer(data))
+	if err != nil {
+		return nil, fmt.Errorf("read %q: %v", name, err)
+	}
+
+	var buf bytes.Buffer
+	_, err = io.Copy(&buf, gz)
+	clErr := gz.Close()
+
+	if err != nil {
+		return nil, fmt.Errorf("read %q: %v", name, err)
+	}
+	if clErr != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+type asset struct {
+	bytes  []byte
+	info   os.FileInfo
+	digest [sha256.Size]byte
+}
+
+type bindataFileInfo struct {
+	name    string
+	size    int64
+	mode    os.FileMode
+	modTime time.Time
+}
+
+func (fi bindataFileInfo) Name() string {
+	return fi.name
+}
+func (fi bindataFileInfo) Size() int64 {
+	return fi.size
+}
+func (fi bindataFileInfo) Mode() os.FileMode {
+	return fi.mode
+}
+func (fi bindataFileInfo) ModTime() time.Time {
+	return fi.modTime
+}
+func (fi bindataFileInfo) IsDir() bool {
+	return false
+}
+func (fi bindataFileInfo) Sys() interface{} {
+	return nil
+}
+
+var __4byte_tracerJs = 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+
+func _4byte_tracerJsBytes() ([]byte, error) {
+	return bindataRead(
+		__4byte_tracerJs,
+		"4byte_tracer.js",
+	)
+}
+
+func _4byte_tracerJs() (*asset, error) {
+	bytes, err := _4byte_tracerJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "4byte_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0xb4, 0xc5, 0x48, 0x2d, 0xd9, 0x43, 0x95, 0x93, 0x3b, 0x93, 0x2c, 0x47, 0x8c, 0x84, 0x32, 0x3c, 0x8b, 0x2e, 0xf3, 0x72, 0xc4, 0x57, 0xe6, 0x3a, 0xb3, 0xdf, 0x1d, 0xbf, 0x45, 0x3, 0xfc, 0xa}}
+	return a, nil
+}
+
+var _bigram_tracerJs = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x8c\x54\x5b\x6f\xdb\x36\x14\x7e\xf7\xaf\xf8\xde\x92\x20\xae\xd4\x6e\x2f\x83\x33\x0f\xd0\xb2\xa4\x35\x90\xda\x81\xad\xac\x30\x86\x3d\x50\xd2\x91\x44\x84\x26\x05\xf2\xd0\xae\x50\xe4\xbf\x17\x94\x2c\x5f\x8a\x14\x8d\x9e\x64\xf3\xbb\x9d\x0b\x15\xc7\xb8\x35\x4d\x6b\x65\x55\x33\x7e\x7b\xff\xe1\x0f\xa4\x35\xa1\x32\xef\x88\x6b\xb2\xe4\x37\x48\x3c\xd7\xc6\xba\x51\x1c\x23\xad\xa5\x43\x29\x15\x41\x3a\x34\xc2\x32\x4c\x09\xfe\x01\xaf\x64\x66\x85\x6d\xa3\x51\x1c\xf7\x9c\x57\x8f\x83\x42\x69\x89\xe0\x4c\xc9\x3b\x61\x69\x82\xd6\x78\xe4\x42\xc3\x52\x21\x1d\x5b\x99\x79\x26\x48\x86\xd0\x45\x6c\x2c\x36\xa6\x90\x65\x1b\x24\x25\xc3\xeb\x82\x6c\x67\xcd\x64\x37\x6e\xc8\xf1\x71\xfe\x84\x07\x72\x8e\x2c\x3e\x92\x26\x2b\x14\x1e\x7d\xa6\x64\x8e\x07\x99\x93\x76\x04\xe1\xd0\x84\x7f\x5c\x4d\x05\xb2\x4e\x2e\x10\xef\x43\x94\xd5\x3e\x0a\xee\x8d\xd7\x85\x60\x69\xf4\x18\x24\x43\x72\x6c\xc9\x3a\x69\x34\x7e\x1f\xac\xf6\x82\x63\x18\x1b\x44\x2e\x05\x87\x02\x2c\x4c\x13\x78\x57\x10\xba\x85\x12\x7c\xa4\xbe\xa1\x21\xc7\xba\x0b\x48\xdd\xd9\xd4\xa6\x21\x70\x2d\x38\x54\xbd\x93\x4a\x21\x23\x78\x47\xa5\x57\xe3\xa0\x96\x79\xc6\x97\x59\xfa\x69\xf1\x94\x22\x99\xaf\xf1\x25\x59\x2e\x93\x79\xba\xbe\xc1\x4e\x72\x6d\x3c\x83\xb6\xd4\x4b\xc9\x4d\xa3\x24\x15\xd8\x09\x6b\x85\xe6\x16\xa6\x0c\x0a\x9f\xef\x96\xb7\x9f\x92\x79\x9a\xfc\x3d\x7b\x98\xa5\x6b\x18\x8b\xfb\x59\x3a\xbf\x5b\xad\x70\xbf\x58\x22\xc1\x63\xb2\x4c\x67\xb7\x4f\x0f\xc9\x12\x8f\x4f\xcb\xc7\xc5\xea\x2e\xc2\x8a\x42\x2a\x0a\xfc\x5f\xf7\xbc\xec\xa6\x67\x09\x05\xb1\x90\xca\x0d\x9d\x58\x1b\x0f\x57\x1b\xaf\x0a\xd4\x62\x4b\xb0\x94\x93\xdc\x52\x01\x81\xdc\x34\xed\x9b\x87\x1a\xb4\x84\x32\xba\xea\x6a\xfe\xe9\x42\x62\x56\x42\x1b\x1e\xc3\x11\xe1\xcf\x9a\xb9\x99\xc4\xf1\x6e\xb7\x8b\x2a\xed\x23\x63\xab\x58\xf5\x72\x2e\xfe\x2b\x1a\x8d\xbe\x8d\x00\x20\x8e\x51\x4b\xc7\x61\x38\x41\x36\x37\x5e\x33\xd9\x6e\xdf\x4c\x93\x9b\x82\x90\xc9\xca\x8a\x8d\xeb\xd0\x01\x3a\xc1\xb7\x97\xf1\xc0\x55\xc2\xf1\xa2\x09\xec\xf0\x06\xd3\x90\xed\xd6\xaa\x3b\xef\x0f\x27\xb8\xb8\x38\xe0\xe9\x2b\xe5\x3e\x00\x50\x50\xc3\x75\xb0\xd9\x13\x0f\x8c\x7f\xc2\xc1\x04\xef\x0f\x1c\xc7\xd4\x39\x48\xbd\x35\xcf\x54\x74\xdd\xa6\x2d\xd9\x76\x48\xd8\x6d\x4f\x48\xff\xef\xe7\xbd\x01\xb9\xa8\x63\x07\xea\x04\xa5\xd7\x79\xf0\xbc\x54\xa6\x1a\xa3\xc8\xae\xd0\xd7\x1e\x9e\xad\x08\x1b\x8d\x29\x94\xa9\x22\xd3\x44\x6c\x56\x6c\xa5\xae\x2e\xaf\x6e\xce\x30\x7d\xdc\x1e\x56\x51\x1f\xf2\x14\x23\x4b\x5c\xee\x31\x53\x70\x2d\x5d\x74\xa8\xe5\xea\xe8\x36\xa8\x3d\x53\x8b\x13\xd8\xa2\xb9\xbe\x78\x77\x71\x6d\x9a\x9b\x33\x64\xd0\xec\x30\xa1\xed\xff\x3d\x53\xfb\xff\x0f\x52\xe1\x39\x07\x5c\x5f\x9f\x4b\xbc\x9c\xfd\x22\xe5\x08\xbf\x92\xc0\x14\x1f\x7e\x26\x72\x7c\x3b\xc9\x8e\x29\x4e\x93\x9f\x17\x8f\x69\xdf\xba\xfe\xfc\xb8\x38\xa5\xf0\x8a\x4f\xa7\xba\xab\xf7\xb7\x58\xe4\xec\x85\x3a\xd9\x14\x53\x42\xe8\x61\xd6\x65\x7f\xbf\x82\x4a\x27\xf1\xea\x74\x8f\x36\x96\xdc\x6b\x3e\x42\xa9\xce\xab\x17\x75\xfd\xed\xcc\x88\x34\x24\x87\x0d\xa6\x02\x66\x4b\x36\x7c\x99\x61\x89\xbd\xd5\x6e\x50\x0c\xb4\x52\x6a\xa1\x06\xed\xfd\x25\x66\x2b\x72\xa9\xab\x3e\x5a\x7f\x74\x92\x2d\xe7\xaf\xa7\x5b\xd7\x6b\x1e\x1b\x7f\xe8\xce\xcb\xe8\x7b\x00\x00\x00\xff\xff\x83\xb5\xcb\x27\xb0\x06\x00\x00")
+
+func bigram_tracerJsBytes() ([]byte, error) {
+	return bindataRead(
+		_bigram_tracerJs,
+		"bigram_tracer.js",
+	)
+}
+
+func bigram_tracerJs() (*asset, error) {
+	bytes, err := bigram_tracerJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "bigram_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0x77, 0x6c, 0xd, 0x24, 0xf2, 0x49, 0xbd, 0x58, 0x8b, 0xb5, 0xd1, 0xc9, 0xcd, 0xcf, 0x5b, 0x3e, 0x5c, 0xfb, 0x14, 0x50, 0xe7, 0xe3, 0xb9, 0xd1, 0x54, 0x69, 0xe6, 0x5e, 0x45, 0xa6, 0x2c, 0x6c}}
+	return a, nil
+}
+
+var _call_tracerJs = 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+
+func call_tracerJsBytes() ([]byte, error) {
+	return bindataRead(
+		_call_tracerJs,
+		"call_tracer.js",
+	)
+}
+
+func call_tracerJs() (*asset, error) {
+	bytes, err := call_tracerJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "call_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0xe9, 0xef, 0x68, 0xda, 0xd8, 0x9, 0xf5, 0xd5, 0x71, 0xa8, 0x8a, 0xfb, 0x30, 0xe8, 0xf0, 0x72, 0x14, 0x36, 0x6b, 0x62, 0x5a, 0x4e, 0xff, 0x16, 0xdc, 0xd3, 0x2c, 0x68, 0x7b, 0x79, 0x9f, 0xd3}}
+	return a, nil
+}
+
+var _evmdis_tracerJs = 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+
+func evmdis_tracerJsBytes() ([]byte, error) {
+	return bindataRead(
+		_evmdis_tracerJs,
+		"evmdis_tracer.js",
+	)
+}
+
+func evmdis_tracerJs() (*asset, error) {
+	bytes, err := evmdis_tracerJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "evmdis_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0xd5, 0xe8, 0x96, 0xa1, 0x8b, 0xc, 0x68, 0x3c, 0xe8, 0x5d, 0x7e, 0xf0, 0xab, 0xfe, 0xec, 0xd1, 0xb, 0x3d, 0xfc, 0xc7, 0xac, 0xb5, 0xa, 0x41, 0x55, 0x0, 0x3a, 0x60, 0xa7, 0x8e, 0x46, 0x93}}
+	return a, nil
+}
+
+var _noop_tracerJs = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x8c\x93\x4f\x6f\xdb\x46\x10\xc5\xcf\xe6\xa7\x78\xc7\x04\x50\xc5\xfe\x39\x14\x70\x8a\x02\xac\x61\x27\x2a\x1c\xdb\x90\xe8\x06\x3e\x0e\xc9\xa1\xb8\xe9\x6a\x87\x9d\x9d\x95\x22\x18\xfe\xee\xc5\x92\x12\x12\x14\x69\x9b\x9b\xb0\xd2\xfb\xbd\x37\xf3\x46\x65\x89\x2b\x19\x8f\xea\xb6\x83\xe1\xc7\xef\x7f\xf8\x19\xf5\xc0\xd8\xca\x77\x6c\x03\x2b\xa7\x1d\xaa\x64\x83\x68\x2c\xca\x12\xf5\xe0\x22\x7a\xe7\x19\x2e\x62\x24\x35\x48\x0f\xfb\xc7\xef\xbd\x6b\x94\xf4\xb8\x2c\xca\x72\xd6\x7c\xf5\xeb\x4c\xe8\x95\x19\x51\x7a\x3b\x90\xf2\x25\x8e\x92\xd0\x52\x80\x72\xe7\xa2\xa9\x6b\x92\x31\x9c\x81\x42\x57\x8a\x62\x27\x9d\xeb\x8f\x19\xe9\x0c\x29\x74\xac\x93\xb5\xb1\xee\xe2\x39\xc7\xdb\xbb\x47\xdc\x72\x8c\xac\x78\xcb\x81\x95\x3c\x1e\x52\xe3\x5d\x8b\x5b\xd7\x72\x88\x0c\x8a\x18\xf3\x4b\x1c\xb8\x43\x33\xe1\xb2\xf0\x26\x47\xd9\x9c\xa2\xe0\x46\x52\xe8\xc8\x9c\x84\x05\xd8\xe5\xe4\xd8\xb3\x46\x27\x01\x3f\x9d\xad\x4e\xc0\x05\x44\x33\xe4\x15\x59\x1e\x40\x21\x63\xd6\xbd\x06\x85\x23\x3c\xd9\x67\xe9\x37\x2c\xe4\xf3\xdc\x1d\x5c\x98\x6c\x06\x19\x19\x36\x90\xe5\xa9\x0f\xce\x7b\x34\x8c\x14\xb9\x4f\x7e\x91\x69\x4d\x32\x7c\x58\xd5\xef\xee\x1f\x6b\x54\x77\x4f\xf8\x50\xad\xd7\xd5\x5d\xfd\xf4\x06\x07\x67\x83\x24\x03\xef\x79\x46\xb9\xdd\xe8\x1d\x77\x38\x90\x2a\x05\x3b\x42\xfa\x4c\x78\x7f\xbd\xbe\x7a\x57\xdd\xd5\xd5\x6f\xab\xdb\x55\xfd\x04\x51\xdc\xac\xea\xbb\xeb\xcd\x06\x37\xf7\x6b\x54\x78\xa8\xd6\xf5\xea\xea\xf1\xb6\x5a\xe3\xe1\x71\xfd\x70\xbf\xb9\x5e\x62\xc3\x39\x15\x67\xfd\xff\xef\xbc\x9f\xda\x53\x46\xc7\x46\xce\xc7\xf3\x26\x9e\x24\x21\x0e\x92\x7c\x87\x81\xf6\x0c\xe5\x96\xdd\x9e\x3b\x10\x5a\x19\x8f\xdf\x5c\x6a\x66\x91\x97\xb0\x9d\x66\xfe\xd7\x83\xc4\xaa\x47\x10\x5b\x20\x32\xe3\x97\xc1\x6c\xbc\x2c\xcb\xc3\xe1\xb0\xdc\x86\xb4\x14\xdd\x96\x7e\xc6\xc5\xf2\xd7\x65\x91\x99\x41\x64\xac\x95\x5a\xd6\x5c\xce\xc7\x14\x6d\x62\x37\xa4\xdc\x48\x60\x34\xe2\x3c\xeb\x98\x5b\x46\x2b\x5d\x1e\xe0\xaf\xe4\x94\x3b\xf4\x2a\x3b\x10\x7e\xa7\x3d\x6d\x5a\x75\xa3\x65\x9c\x34\x1f\xb9\x35\x98\xcc\x15\x52\xe3\xa7\x73\x24\x98\x52\x88\xd4\xe6\xbb\xc9\x9f\x5b\xd6\x65\xf1\x5c\x5c\x94\x25\xa2\xf1\x98\xbd\x5d\xd8\xcb\x9f\x99\x2b\x9a\xfb\xd4\x23\x64\x9c\x1c\xa7\xcb\xc8\xa1\xfe\x78\x0f\xfe\xc4\x6d\x32\x8e\xcb\xe2\x22\xeb\x2e\xd1\xa7\x30\x41\x5f\x79\xd9\x2e\xd0\x35\xaf\xf1\x8c\x97\x45\x31\x91\x7b\x4a\xde\xbe\x44\x1f\x86\xd3\x99\x50\x6b\x89\xfc\x89\x96\x23\x49\x0f\x0a\x67\xc3\x7e\x2e\xf0\x62\xd2\xff\xb7\x85\x72\xfc\x9a\x07\x79\x3f\xf9\xcc\xc0\x38\x57\xdf\x30\x07\x38\x63\xa5\x7c\xfb\xb2\x67\xcd\x7f\x7b\x28\x5b\xd2\x10\x27\x5c\xd6\xf4\x2e\x90\x3f\x83\x4f\xe7\x91\x37\xe6\xc2\x76\x59\x5c\xcc\xef\x5f\x84\x6a\xed\xd3\x39\xd4\x4c\xc2\xf3\xcb\x1b\xbc\x14\x2f\xc5\xdf\x01\x00\x00\xff\xff\x77\x56\xe7\x1a\xf7\x04\x00\x00")
+
+func noop_tracerJsBytes() ([]byte, error) {
+	return bindataRead(
+		_noop_tracerJs,
+		"noop_tracer.js",
+	)
+}
+
+func noop_tracerJs() (*asset, error) {
+	bytes, err := noop_tracerJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "noop_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0xe3, 0xf, 0x1c, 0x6f, 0x65, 0xaf, 0x90, 0x31, 0xab, 0xf, 0xe0, 0xca, 0x54, 0x7, 0xfd, 0xd3, 0xa1, 0x4a, 0x14, 0x1, 0x2a, 0x9d, 0xdc, 0xb9, 0x64, 0x69, 0x83, 0x30, 0xb1, 0x2a, 0xbd, 0xfb}}
+	return a, nil
+}
+
+var _opcount_tracerJs = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x8c\x94\xcf\x6e\xdb\x46\x10\x87\xcf\xe2\x53\xfc\x8e\x09\xa2\x92\x69\x7b\x28\xe0\x16\x05\x58\xc3\x4e\x04\xd8\xb2\x21\xd1\x09\x7c\x5c\x92\x43\x71\x9b\xd5\x2e\x31\x3b\x2b\x86\x08\xfc\xee\xc5\x2e\xc5\xc6\x08\x5c\xd4\xd7\xd5\xcc\xf7\xcd\x3f\xb1\x28\x70\xe9\x86\x89\xf5\xa1\x17\xfc\xf2\xfe\xe7\xdf\x50\xf5\x84\x83\xfb\x89\xa4\x27\xa6\x70\x44\x19\xa4\x77\xec\xb3\xa2\x40\xd5\x6b\x8f\x4e\x1b\x82\xf6\x18\x14\x0b\x5c\x07\xf9\x21\xde\xe8\x9a\x15\x4f\x79\x56\x14\x73\xce\x8b\x3f\x47\x42\xc7\x44\xf0\xae\x93\x51\x31\x5d\x60\x72\x01\x8d\xb2\x60\x6a\xb5\x17\xd6\x75\x10\x82\x16\x28\xdb\x16\x8e\x71\x74\xad\xee\xa6\x88\xd4\x82\x60\x5b\xe2\xa4\x16\xe2\xa3\x5f\xea\xf8\xb0\x7d\xc0\x0d\x79\x4f\x8c\x0f\x64\x89\x95\xc1\x7d\xa8\x8d\x6e\x70\xa3\x1b\xb2\x9e\xa0\x3c\x86\xf8\xe2\x7b\x6a\x51\x27\x5c\x4c\xbc\x8e\xa5\xec\xcf\xa5\xe0\xda\x05\xdb\x2a\xd1\xce\xae\x41\x3a\x56\x8e\x13\xb1\xd7\xce\xe2\xd7\x45\x75\x06\xae\xe1\x38\x42\xde\x28\x89\x0d\x30\xdc\x10\xf3\xde\x42\xd9\x09\x46\xc9\xf7\xd4\x57\x0c\xe4\x7b\xdf\x2d\xb4\x4d\x9a\xde\x0d\x04\xe9\x95\xc4\xae\x47\x6d\x0c\x6a\x42\xf0\xd4\x05\xb3\x8e\xb4\x3a\x08\x3e\x6f\xaa\x8f\x77\x0f\x15\xca\xed\x23\x3e\x97\xbb\x5d\xb9\xad\x1e\x7f\xc7\xa8\xa5\x77\x41\x40\x27\x9a\x51\xfa\x38\x18\x4d\x2d\x46\xc5\xac\xac\x4c\x70\x5d\x24\xdc\x5e\xed\x2e\x3f\x96\xdb\xaa\xfc\x6b\x73\xb3\xa9\x1e\xe1\x18\xd7\x9b\x6a\x7b\xb5\xdf\xe3\xfa\x6e\x87\x12\xf7\xe5\xae\xda\x5c\x3e\xdc\x94\x3b\xdc\x3f\xec\xee\xef\xf6\x57\x39\xf6\x14\xab\xa2\x98\xff\xff\x33\xef\xd2\xf6\x98\xd0\x92\x28\x6d\xfc\x32\x89\x47\x17\xe0\x7b\x17\x4c\x8b\x5e\x9d\x08\x4c\x0d\xe9\x13\xb5\x50\x68\xdc\x30\xbd\x7a\xa9\x91\xa5\x8c\xb3\x87\xd4\xf3\x7f\x1e\x24\x36\x1d\xac\x93\x35\x3c\x11\xfe\xe8\x45\x86\x8b\xa2\x18\xc7\x31\x3f\xd8\x90\x3b\x3e\x14\x66\xc6\xf9\xe2\xcf\x3c\x8b\x4c\x37\x34\x2e\x58\xa9\x58\x35\xc4\x71\x3f\x0a\x5e\x1d\x07\x43\x90\xf9\x29\xed\xe5\xef\xe0\x05\x29\xd0\x27\xb5\x0d\xc7\x9a\x38\x16\xaf\xad\x17\x0e\x4d\xbc\x87\xf4\xf7\xa1\xaf\xd4\xa4\xdd\xd6\x53\x8a\xbc\xfa\x74\x8b\x9a\xba\x38\x99\x74\xc9\xac\xac\x57\x29\x3c\x5d\xb5\xb6\x4a\xa8\xcd\xb3\x6f\xd9\xaa\x28\x66\x43\x12\x7f\xf9\xd1\x13\x39\xcf\x5d\xff\x8a\xf2\x6c\x95\xd2\x2e\xf0\x7e\x9d\x25\x8a\x17\x1a\x62\x27\xda\x9e\xdc\x17\x6a\xd3\x6a\xe8\x44\x3c\xa5\x66\xdb\xf3\xa9\x45\xfc\xa7\xdb\x05\xe3\xf3\x6c\x15\xf3\x2e\xd0\x05\x9b\x0c\x6f\x8c\x3b\xac\xd1\xd6\x6f\xf1\x0d\xd2\x6b\x9f\x27\xcb\xbb\x77\x78\x3a\x6b\x3a\x15\x8c\x3c\xf7\x8c\xfd\xf9\x08\x55\x23\x41\x99\x33\x3a\x76\xea\x3a\x28\xbb\xd8\xbb\xf9\x3c\x56\x29\xff\x65\xdf\xa2\x60\xf2\x2f\x39\x94\x31\xc9\x33\x03\xfd\x7c\x58\x35\x91\x85\x16\xe2\x38\x50\xb8\x13\x71\xfc\xa8\x80\x49\x02\x5b\x9f\x70\x31\xa7\xd3\x56\x99\x05\x7c\x3e\xbe\x38\x70\x6d\x0f\x79\xb6\x9a\xdf\x9f\x15\xd5\xc8\xd7\xa5\xa8\x99\xf4\x6c\x16\x78\xca\x9e\xb2\x7f\x02\x00\x00\xff\xff\xdd\xd8\xa1\x0a\x5c\x05\x00\x00")
+
+func opcount_tracerJsBytes() ([]byte, error) {
+	return bindataRead(
+		_opcount_tracerJs,
+		"opcount_tracer.js",
+	)
+}
+
+func opcount_tracerJs() (*asset, error) {
+	bytes, err := opcount_tracerJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "opcount_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0x27, 0xe, 0x97, 0x88, 0x9b, 0x53, 0xbb, 0x20, 0x44, 0xd8, 0xf5, 0xeb, 0x41, 0xd2, 0x7e, 0xd6, 0xda, 0x6b, 0xf5, 0xaf, 0x0, 0x75, 0x9f, 0xd9, 0x22, 0xc, 0x6e, 0x74, 0xac, 0x2a, 0xa9, 0xa7}}
+	return a, nil
+}
+
+var _prestate_tracerJs = 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+
+func prestate_tracerJsBytes() ([]byte, error) {
+	return bindataRead(
+		_prestate_tracerJs,
+		"prestate_tracer.js",
+	)
+}
+
+func prestate_tracerJs() (*asset, error) {
+	bytes, err := prestate_tracerJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "prestate_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0xe9, 0x79, 0x70, 0x4f, 0xc5, 0x78, 0x57, 0x63, 0x6f, 0x5, 0x31, 0xce, 0x3e, 0x5d, 0xbd, 0x71, 0x4, 0x46, 0x78, 0xcd, 0x1d, 0xcd, 0xb9, 0xd8, 0x10, 0xff, 0xe6, 0xc5, 0x59, 0xb9, 0x25, 0x6e}}
+	return a, nil
+}
+
+var _trigram_tracerJs = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x8c\x94\x4f\x6f\xe3\x36\x10\xc5\xef\xfe\x14\xaf\x27\x27\x88\xd7\x4a\xda\x4b\xe1\xd4\x05\xdc\x6c\xb2\x6b\x20\x6b\x07\xb6\xd2\x45\x10\xe4\x40\x4b\x23\x89\x08\x4d\x0a\xe4\xd0\x5e\x21\xc8\x77\x2f\xa8\x3f\xfe\x13\xb8\xed\xfa\x64\x70\xe6\xfd\xe6\xcd\x70\xc4\x28\xc2\x8d\x29\x2b\x2b\xf3\x82\xf1\xeb\xe5\xd5\xef\x88\x0b\x42\x6e\x3e\x11\x17\x64\xc9\xaf\x31\xf1\x5c\x18\xeb\x7a\x51\x84\xb8\x90\x0e\x99\x54\x04\xe9\x50\x0a\xcb\x30\x19\xf8\x43\xbe\x92\x2b\x2b\x6c\x35\xec\x45\x51\xa3\x39\x19\x0e\x84\xcc\x12\xc1\x99\x8c\xb7\xc2\xd2\x08\x95\xf1\x48\x84\x86\xa5\x54\x3a\xb6\x72\xe5\x99\x20\x19\x42\xa7\x91\xb1\x58\x9b\x54\x66\x55\x40\x4a\x86\xd7\x29\xd9\xba\x34\x93\x5d\xbb\xce\xc7\x97\xd9\x23\xee\xc9\x39\xb2\xf8\x42\x9a\xac\x50\x78\xf0\x2b\x25\x13\xdc\xcb\x84\xb4\x23\x08\x87\x32\x9c\xb8\x82\x52\xac\x6a\x5c\x10\xde\x05\x2b\xcb\xd6\x0a\xee\x8c\xd7\xa9\x60\x69\xf4\x00\x24\x83\x73\x6c\xc8\x3a\x69\x34\x7e\xeb\x4a\xb5\xc0\x01\x8c\x0d\x90\x33\xc1\xa1\x01\x0b\x53\x06\xdd\x39\x84\xae\xa0\x04\xef\xa5\x3f\x31\x90\x7d\xdf\x29\xa4\xae\xcb\x14\xa6\x24\x70\x21\x38\x74\xbd\x95\x4a\x61\x45\xf0\x8e\x32\xaf\x06\x81\xb6\xf2\x8c\xef\xd3\xf8\xeb\xfc\x31\xc6\x64\xf6\x84\xef\x93\xc5\x62\x32\x8b\x9f\xae\xb1\x95\x5c\x18\xcf\xa0\x0d\x35\x28\xb9\x2e\x95\xa4\x14\x5b\x61\xad\xd0\x5c\xc1\x64\x81\xf0\xed\x76\x71\xf3\x75\x32\x8b\x27\x7f\x4d\xef\xa7\xf1\x13\x8c\xc5\xdd\x34\x9e\xdd\x2e\x97\xb8\x9b\x2f\x30\xc1\xc3\x64\x11\x4f\x6f\x1e\xef\x27\x0b\x3c\x3c\x2e\x1e\xe6\xcb\xdb\x21\x96\x14\x5c\x51\xd0\xff\xff\xcc\xb3\xfa\xf6\x2c\x21\x25\x16\x52\xb9\x6e\x12\x4f\xc6\xc3\x15\xc6\xab\x14\x85\xd8\x10\x2c\x25\x24\x37\x94\x42\x20\x31\x65\xf5\xd3\x97\x1a\x58\x42\x19\x9d\xd7\x3d\xff\xeb\x42\x62\x9a\x41\x1b\x1e\xc0\x11\xe1\x8f\x82\xb9\x1c\x45\xd1\x76\xbb\x1d\xe6\xda\x0f\x8d\xcd\x23\xd5\xe0\x5c\xf4\xe7\xb0\xd7\x7b\xeb\x01\x40\x14\xa1\x90\x8e\xc3\xe5\x04\xec\x5a\x94\xb5\x2b\x2b\x73\x2b\xd6\x48\x8c\xd7\x4c\xd6\xd5\xa9\x21\x6f\x84\xb7\xf7\x41\x27\x54\xc2\xf1\xbc\x0c\xd2\xf0\x0f\xa6\x24\x5b\xef\x54\x1d\x6f\x82\x6e\x84\xe7\x7e\x7f\xd0\xef\xbf\x0c\x76\xa7\x9f\xa9\xe4\x62\x84\xcb\xe6\xa4\x65\x39\xa6\x9a\x24\xf5\xc6\xbc\x52\x5a\x8f\x94\x36\x64\x2b\x98\x32\x31\x69\xbb\x22\xc1\xe2\xdf\xdf\x40\x3f\x28\xf1\x4c\x6e\x58\x13\x82\x74\x84\xcc\xeb\x24\x14\x3f\x53\x26\x1f\x20\x5d\x9d\xe3\x6d\xc7\xdf\x08\x8b\x34\x54\xc5\x18\xca\xe4\xc3\x9c\x1a\x13\x67\xe7\xd7\xbb\x1c\x99\xe1\xac\xc9\xf9\x65\x0c\x2e\xa4\x1b\xee\xbc\x9e\xef\x49\xe1\xb7\x0b\xce\x4b\x87\x71\xd7\xdf\xf5\xe9\x9c\xcf\x6d\xd9\x1a\x7d\x9c\x63\x89\xbd\xd5\xfb\xb3\xf7\x23\xbf\xa6\x6c\xcd\x9a\x72\xc8\x66\xc9\x56\xea\xfc\xd0\x6f\xc8\x79\xa5\x0a\xe3\x23\x3f\xcf\x97\x2f\x17\xfd\x4f\xfd\x8b\xa3\xb3\xab\xe6\xcc\x94\xc7\xdd\xd6\x39\xe1\x52\x9f\x5f\xa9\x7a\x39\xd5\xe4\x2e\x78\x71\x71\xca\x26\x29\x47\xf8\x2f\x19\xc6\xb8\x3a\x25\xfc\xe0\xf8\x63\x0f\x57\x07\xc3\xfc\x10\xc0\x18\x5d\x1b\xfb\x3d\xcc\x84\x57\x7c\xb8\x3c\xdb\xa2\x7d\x11\x44\xc2\x5e\xa8\x76\x5f\xc2\xeb\x66\x32\x08\xdd\xad\x54\xd6\x7c\xab\x81\x52\x23\x4e\x2e\xd1\xbe\x8c\x25\x77\xaa\x8e\x50\xaa\xae\xd5\x40\x5d\xf3\xa5\xaf\x88\x34\x24\x87\x0f\x82\x52\x98\x0d\xd9\xf0\xca\xb7\x57\xee\x3a\x62\x90\x65\x52\x0b\xd5\xb1\xdb\x07\x81\xad\x48\xa4\xce\x1b\x6b\x4d\xe8\xc0\x5b\xc2\x3f\x0e\x97\xbb\x61\xee\x27\xbf\x9b\xce\x7b\xef\x9f\x00\x00\x00\xff\xff\xb3\x93\x16\xd5\xfc\x06\x00\x00")
+
+func trigram_tracerJsBytes() ([]byte, error) {
+	return bindataRead(
+		_trigram_tracerJs,
+		"trigram_tracer.js",
+	)
+}
+
+func trigram_tracerJs() (*asset, error) {
+	bytes, err := trigram_tracerJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "trigram_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0x40, 0x63, 0xe1, 0x42, 0x60, 0x7, 0x1b, 0x79, 0x47, 0x1, 0xa1, 0xbf, 0xc4, 0x66, 0x19, 0x9b, 0x2b, 0x5a, 0x1f, 0x82, 0x3d, 0xcf, 0xee, 0xe7, 0x60, 0x25, 0x2c, 0x4f, 0x13, 0x97, 0xc7, 0x18}}
+	return a, nil
+}
+
+var _unigram_tracerJs = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x8c\x54\x4d\x6f\xdb\x46\x10\xbd\xeb\x57\xbc\xa3\x8c\xa8\xa4\xd3\x5e\x0a\xa5\x09\xc0\x1a\x76\x22\xc0\x91\x0d\x89\x6e\x60\x14\x3d\x2c\xc9\x21\xb9\xe8\x6a\x87\xd8\x9d\x95\x42\x04\xfa\xef\xc5\x92\xa2\xe5\x1a\x6e\x13\x9e\x04\xcd\xbc\x8f\x79\x33\x64\x9a\xe2\x8a\xbb\xde\xe9\xa6\x15\xfc\x7c\xf9\xf6\x57\xe4\x2d\xa1\xe1\x9f\x48\x5a\x72\x14\x76\xc8\x82\xb4\xec\xfc\x2c\x4d\x91\xb7\xda\xa3\xd6\x86\xa0\x3d\x3a\xe5\x04\x5c\x43\x5e\xf4\x1b\x5d\x38\xe5\xfa\x64\x96\xa6\x23\xe6\xd5\x72\x64\xa8\x1d\x11\x3c\xd7\x72\x50\x8e\x96\xe8\x39\xa0\x54\x16\x8e\x2a\xed\xc5\xe9\x22\x08\x41\x0b\x94\xad\x52\x76\xd8\x71\xa5\xeb\x3e\x52\x6a\x41\xb0\x15\xb9\x41\x5a\xc8\xed\xfc\xe4\xe3\xe3\xfa\x01\xb7\xe4\x3d\x39\x7c\x24\x4b\x4e\x19\xdc\x87\xc2\xe8\x12\xb7\xba\x24\xeb\x09\xca\xa3\x8b\xff\xf8\x96\x2a\x14\x03\x5d\x04\xde\x44\x2b\xdb\x93\x15\xdc\x70\xb0\x95\x12\xcd\x76\x01\xd2\xd1\x39\xf6\xe4\xbc\x66\x8b\x5f\x26\xa9\x13\xe1\x02\xec\x22\xc9\x5c\x49\x1c\xc0\x81\xbb\x88\xbb\x80\xb2\x3d\x8c\x92\x33\xf4\x07\x02\x39\xcf\x5d\x41\xdb\x41\xa6\xe5\x8e\x20\xad\x92\x38\xf5\x41\x1b\x83\x82\x10\x3c\xd5\xc1\x2c\x22\x5b\x11\x04\x5f\x56\xf9\xa7\xbb\x87\x1c\xd9\xfa\x11\x5f\xb2\xcd\x26\x5b\xe7\x8f\xef\x70\xd0\xd2\x72\x10\xd0\x9e\x46\x2a\xbd\xeb\x8c\xa6\x0a\x07\xe5\x9c\xb2\xd2\x83\xeb\xc8\xf0\xf9\x7a\x73\xf5\x29\x5b\xe7\xd9\xef\xab\xdb\x55\xfe\x08\x76\xb8\x59\xe5\xeb\xeb\xed\x16\x37\x77\x1b\x64\xb8\xcf\x36\xf9\xea\xea\xe1\x36\xdb\xe0\xfe\x61\x73\x7f\xb7\xbd\x4e\xb0\xa5\xe8\x8a\x22\xfe\xfb\x99\xd7\xc3\xf6\x1c\xa1\x22\x51\xda\xf8\x29\x89\x47\x0e\xf0\x2d\x07\x53\xa1\x55\x7b\x82\xa3\x92\xf4\x9e\x2a\x28\x94\xdc\xf5\x3f\xbc\xd4\xc8\xa5\x0c\xdb\x66\x98\xf9\x3f\x0f\x12\xab\x1a\x96\x65\x01\x4f\x84\xdf\x5a\x91\x6e\x99\xa6\x87\xc3\x21\x69\x6c\x48\xd8\x35\xa9\x19\xe9\x7c\xfa\x21\x99\xcd\xbe\xcd\x00\x20\x4d\xd1\x6a\x2f\x71\x39\x91\x76\xa7\xba\xe8\x8a\xbb\x92\x2b\xf2\x10\x46\xc9\xc1\x0a\x39\x3f\x74\xc7\xd6\x25\xbe\x1d\x17\x13\xd6\x72\xe7\xc7\x16\x0f\x1b\x76\x05\xb9\x11\x3e\xb6\xc7\xea\x12\x97\x4f\xdd\x5e\xa8\x8b\x4a\xda\xee\xf9\x6f\xaa\x86\xdc\x68\x4f\xae\x3f\x09\x8e\x77\x10\x7d\xfc\xf1\x19\xf4\x95\xca\x20\xe4\x93\x01\x1d\xa1\x4b\xd4\xc1\x96\xf1\xfa\xe6\x86\x9b\x05\xaa\xe2\x02\xe3\x14\xf1\xd9\xab\x78\x9b\x78\x0f\xc3\x4d\xc2\x5d\x22\xbc\x15\xa7\x6d\x33\xbf\x78\xf7\xd4\xa3\x6b\xcc\xa5\xd5\x3e\x89\x83\xfc\xc9\xdd\x5f\x17\x67\x7c\x7c\xfe\x55\x7b\xf3\xe6\x0c\x3c\x3e\xfd\x22\xe3\x09\xff\x83\xc2\x7b\xbc\x7d\x0d\x37\x34\xc5\x40\x26\xda\x73\x88\xb5\x0a\x46\x9e\xe7\x72\x68\x4f\x17\xad\x4a\x09\xca\x9c\xa2\x88\x6f\x27\xd7\x50\x76\x4a\xab\x1e\x6f\x2d\xb2\x0c\x14\xaf\xe6\x73\x5c\xcc\x26\x1d\x47\xfe\x35\x21\x65\xcc\x20\x36\x2d\x7d\x38\xd5\x82\xc8\x42\x0b\x39\x15\xdf\x55\xde\x93\x8b\x9f\x29\x38\x92\xe0\xac\x9f\x18\x23\xac\xd6\x56\x99\x89\xfb\x74\xd1\xe2\x54\xa9\x6d\x33\x7a\x1b\x4b\xcf\xcc\x95\xf2\xf5\xf9\xe2\x74\x3d\x7f\x0a\x07\x1f\x70\xf9\x62\x27\xa3\xe4\x39\xe4\x97\xe1\x1e\x17\xb3\xe3\xec\x9f\x00\x00\x00\xff\xff\x8d\xba\x8d\xa8\xe6\x05\x00\x00")
+
+func unigram_tracerJsBytes() ([]byte, error) {
+	return bindataRead(
+		_unigram_tracerJs,
+		"unigram_tracer.js",
+	)
+}
+
+func unigram_tracerJs() (*asset, error) {
+	bytes, err := unigram_tracerJsBytes()
+	if err != nil {
+		return nil, err
+	}
+
+	info := bindataFileInfo{name: "unigram_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0x2f, 0x36, 0x14, 0xc2, 0xf6, 0xc3, 0x80, 0x2b, 0x4a, 0x11, 0x7d, 0xd5, 0x3e, 0xef, 0x23, 0xb5, 0xd6, 0xe6, 0xe6, 0x5, 0x41, 0xf6, 0x14, 0x7a, 0x39, 0xf7, 0xf8, 0xac, 0x89, 0x8e, 0x43, 0xe6}}
+	return a, nil
+}
+
+// Asset loads and returns the asset for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func Asset(name string) ([]byte, error) {
+	canonicalName := strings.Replace(name, "\\", "/", -1)
+	if f, ok := _bindata[canonicalName]; ok {
+		a, err := f()
+		if err != nil {
+			return nil, fmt.Errorf("Asset %s can't read by error: %v", name, err)
+		}
+		return a.bytes, nil
+	}
+	return nil, fmt.Errorf("Asset %s not found", name)
+}
+
+// AssetString returns the asset contents as a string (instead of a []byte).
+func AssetString(name string) (string, error) {
+	data, err := Asset(name)
+	return string(data), err
+}
+
+// MustAsset is like Asset but panics when Asset would return an error.
+// It simplifies safe initialization of global variables.
+func MustAsset(name string) []byte {
+	a, err := Asset(name)
+	if err != nil {
+		panic("asset: Asset(" + name + "): " + err.Error())
+	}
+
+	return a
+}
+
+// MustAssetString is like AssetString but panics when Asset would return an
+// error. It simplifies safe initialization of global variables.
+func MustAssetString(name string) string {
+	return string(MustAsset(name))
+}
+
+// AssetInfo loads and returns the asset info for the given name.
+// It returns an error if the asset could not be found or
+// could not be loaded.
+func AssetInfo(name string) (os.FileInfo, error) {
+	canonicalName := strings.Replace(name, "\\", "/", -1)
+	if f, ok := _bindata[canonicalName]; ok {
+		a, err := f()
+		if err != nil {
+			return nil, fmt.Errorf("AssetInfo %s can't read by error: %v", name, err)
+		}
+		return a.info, nil
+	}
+	return nil, fmt.Errorf("AssetInfo %s not found", name)
+}
+
+// AssetDigest returns the digest of the file with the given name. It returns an
+// error if the asset could not be found or the digest could not be loaded.
+func AssetDigest(name string) ([sha256.Size]byte, error) {
+	canonicalName := strings.Replace(name, "\\", "/", -1)
+	if f, ok := _bindata[canonicalName]; ok {
+		a, err := f()
+		if err != nil {
+			return [sha256.Size]byte{}, fmt.Errorf("AssetDigest %s can't read by error: %v", name, err)
+		}
+		return a.digest, nil
+	}
+	return [sha256.Size]byte{}, fmt.Errorf("AssetDigest %s not found", name)
+}
+
+// Digests returns a map of all known files and their checksums.
+func Digests() (map[string][sha256.Size]byte, error) {
+	mp := make(map[string][sha256.Size]byte, len(_bindata))
+	for name := range _bindata {
+		a, err := _bindata[name]()
+		if err != nil {
+			return nil, err
+		}
+		mp[name] = a.digest
+	}
+	return mp, nil
+}
+
+// AssetNames returns the names of the assets.
+func AssetNames() []string {
+	names := make([]string, 0, len(_bindata))
+	for name := range _bindata {
+		names = append(names, name)
+	}
+	return names
+}
+
+// _bindata is a table, holding each asset generator, mapped to its name.
+var _bindata = map[string]func() (*asset, error){
+	"4byte_tracer.js": _4byte_tracerJs,
+
+	"bigram_tracer.js": bigram_tracerJs,
+
+	"call_tracer.js": call_tracerJs,
+
+	"evmdis_tracer.js": evmdis_tracerJs,
+
+	"noop_tracer.js": noop_tracerJs,
+
+	"opcount_tracer.js": opcount_tracerJs,
+
+	"prestate_tracer.js": prestate_tracerJs,
+
+	"trigram_tracer.js": trigram_tracerJs,
+
+	"unigram_tracer.js": unigram_tracerJs,
+}
+
+// AssetDir returns the file names below a certain
+// directory embedded in the file by go-bindata.
+// For example if you run go-bindata on data/... and data contains the
+// following hierarchy:
+//     data/
+//       foo.txt
+//       img/
+//         a.png
+//         b.png
+// then AssetDir("data") would return []string{"foo.txt", "img"},
+// AssetDir("data/img") would return []string{"a.png", "b.png"},
+// AssetDir("foo.txt") and AssetDir("notexist") would return an error, and
+// AssetDir("") will return []string{"data"}.
+func AssetDir(name string) ([]string, error) {
+	node := _bintree
+	if len(name) != 0 {
+		canonicalName := strings.Replace(name, "\\", "/", -1)
+		pathList := strings.Split(canonicalName, "/")
+		for _, p := range pathList {
+			node = node.Children[p]
+			if node == nil {
+				return nil, fmt.Errorf("Asset %s not found", name)
+			}
+		}
+	}
+	if node.Func != nil {
+		return nil, fmt.Errorf("Asset %s not found", name)
+	}
+	rv := make([]string, 0, len(node.Children))
+	for childName := range node.Children {
+		rv = append(rv, childName)
+	}
+	return rv, nil
+}
+
+type bintree struct {
+	Func     func() (*asset, error)
+	Children map[string]*bintree
+}
+
+var _bintree = &bintree{nil, map[string]*bintree{
+	"4byte_tracer.js":    {_4byte_tracerJs, map[string]*bintree{}},
+	"bigram_tracer.js":   {bigram_tracerJs, map[string]*bintree{}},
+	"call_tracer.js":     {call_tracerJs, map[string]*bintree{}},
+	"evmdis_tracer.js":   {evmdis_tracerJs, map[string]*bintree{}},
+	"noop_tracer.js":     {noop_tracerJs, map[string]*bintree{}},
+	"opcount_tracer.js":  {opcount_tracerJs, map[string]*bintree{}},
+	"prestate_tracer.js": {prestate_tracerJs, map[string]*bintree{}},
+	"trigram_tracer.js":  {trigram_tracerJs, map[string]*bintree{}},
+	"unigram_tracer.js":  {unigram_tracerJs, map[string]*bintree{}},
+}}
+
+// RestoreAsset restores an asset under the given directory.
+func RestoreAsset(dir, name string) error {
+	data, err := Asset(name)
+	if err != nil {
+		return err
+	}
+	info, err := AssetInfo(name)
+	if err != nil {
+		return err
+	}
+	err = os.MkdirAll(_filePath(dir, filepath.Dir(name)), os.FileMode(0755))
+	if err != nil {
+		return err
+	}
+	err = ioutil.WriteFile(_filePath(dir, name), data, info.Mode())
+	if err != nil {
+		return err
+	}
+	return os.Chtimes(_filePath(dir, name), info.ModTime(), info.ModTime())
+}
+
+// RestoreAssets restores an asset under the given directory recursively.
+func RestoreAssets(dir, name string) error {
+	children, err := AssetDir(name)
+	// File
+	if err != nil {
+		return RestoreAsset(dir, name)
+	}
+	// Dir
+	for _, child := range children {
+		err = RestoreAssets(dir, filepath.Join(name, child))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func _filePath(dir, name string) string {
+	canonicalName := strings.Replace(name, "\\", "/", -1)
+	return filepath.Join(append([]string{dir}, strings.Split(canonicalName, "/")...)...)
+}
diff --git a/eth/tracers/internal/tracers/bigram_tracer.js b/eth/tracers/internal/tracers/bigram_tracer.js
new file mode 100644
index 0000000..421c360
--- /dev/null
+++ b/eth/tracers/internal/tracers/bigram_tracer.js
@@ -0,0 +1,47 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+{
+    // hist is the counters of opcode bigrams
+    hist: {},
+    // lastOp is last operation
+    lastOp: '',
+    // execution depth of last op
+    lastDepth: 0,
+    // step is invoked for every opcode that the VM executes.
+    step: function(log, db) {
+        var op = log.op.toString();
+        var depth = log.getDepth();
+        if (depth == this.lastDepth){
+            var key = this.lastOp+'-'+op;
+            if (this.hist[key]){
+                this.hist[key]++;
+            }
+            else {
+                this.hist[key] = 1;
+            }
+        }
+        this.lastOp = op;
+        this.lastDepth = depth;
+    },
+    // fault is invoked when the actual execution of an opcode fails.
+    fault: function(log, db) {},
+    // result is invoked when all the opcodes have been iterated over and returns
+    // the final result of the tracing.
+    result: function(ctx) {
+        return this.hist;
+    },
+}
diff --git a/eth/tracers/internal/tracers/call_tracer.js b/eth/tracers/internal/tracers/call_tracer.js
new file mode 100644
index 0000000..f8b383c
--- /dev/null
+++ b/eth/tracers/internal/tracers/call_tracer.js
@@ -0,0 +1,246 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// callTracer is a full blown transaction tracer that extracts and reports all
+// the internal calls made by a transaction, along with any useful information.
+{
+	// callstack is the current recursive call stack of the EVM execution.
+	callstack: [{}],
+
+	// descended tracks whether we've just descended from an outer transaction into
+	// an inner call.
+	descended: false,
+
+	// step is invoked for every opcode that the VM executes.
+	step: function(log, db) {
+		// Capture any errors immediately
+		var error = log.getError();
+		if (error !== undefined) {
+			this.fault(log, db);
+			return;
+		}
+		// We only care about system opcodes, faster if we pre-check once
+		var syscall = (log.op.toNumber() & 0xf0) == 0xf0;
+		if (syscall) {
+			var op = log.op.toString();
+		}
+		// If a new contract is being created, add to the call stack
+		if (syscall && (op == 'CREATE' || op == "CREATE2")) {
+			var inOff = log.stack.peek(1).valueOf();
+			var inEnd = inOff + log.stack.peek(2).valueOf();
+
+			// Assemble the internal call report and store for completion
+			var call = {
+				type:    op,
+				from:    toHex(log.contract.getAddress()),
+				input:   toHex(log.memory.slice(inOff, inEnd)),
+				gasIn:   log.getGas(),
+				gasCost: log.getCost(),
+				value:   '0x' + log.stack.peek(0).toString(16)
+			};
+			this.callstack.push(call);
+			this.descended = true
+			return;
+		}
+		// If a contract is being self destructed, gather that as a subcall too
+		if (syscall && op == 'SELFDESTRUCT') {
+			var left = this.callstack.length;
+			if (this.callstack[left-1].calls === undefined) {
+				this.callstack[left-1].calls = [];
+			}
+			this.callstack[left-1].calls.push({type: op});
+			return
+		}
+		// If a new method invocation is being done, add to the call stack
+		if (syscall && (op == 'CALL' || op == 'CALLCODE' || op == 'DELEGATECALL' || op == 'STATICCALL')) {
+			// Skip any pre-compile invocations, those are just fancy opcodes
+			var to = toAddress(log.stack.peek(1).toString(16));
+			if (isPrecompiled(to)) {
+				return
+			}
+			var off = (op == 'DELEGATECALL' || op == 'STATICCALL' ? 0 : 1);
+
+			var inOff = log.stack.peek(2 + off).valueOf();
+			var inEnd = inOff + log.stack.peek(3 + off).valueOf();
+
+			// Assemble the internal call report and store for completion
+			var call = {
+				type:    op,
+				from:    toHex(log.contract.getAddress()),
+				to:      toHex(to),
+				input:   toHex(log.memory.slice(inOff, inEnd)),
+				gasIn:   log.getGas(),
+				gasCost: log.getCost(),
+				outOff:  log.stack.peek(4 + off).valueOf(),
+				outLen:  log.stack.peek(5 + off).valueOf()
+			};
+			if (op != 'DELEGATECALL' && op != 'STATICCALL') {
+				call.value = '0x' + log.stack.peek(2).toString(16);
+			}
+			this.callstack.push(call);
+			this.descended = true
+			return;
+		}
+		// If we've just descended into an inner call, retrieve it's true allowance. We
+		// need to extract if from within the call as there may be funky gas dynamics
+		// with regard to requested and actually given gas (2300 stipend, 63/64 rule).
+		if (this.descended) {
+			if (log.getDepth() >= this.callstack.length) {
+				this.callstack[this.callstack.length - 1].gas = log.getGas();
+			} else {
+				// TODO(karalabe): The call was made to a plain account. We currently don't
+				// have access to the true gas amount inside the call and so any amount will
+				// mostly be wrong since it depends on a lot of input args. Skip gas for now.
+			}
+			this.descended = false;
+		}
+		// If an existing call is returning, pop off the call stack
+		if (syscall && op == 'REVERT') {
+			this.callstack[this.callstack.length - 1].error = "execution reverted";
+			return;
+		}
+		if (log.getDepth() == this.callstack.length - 1) {
+			// Pop off the last call and get the execution results
+			var call = this.callstack.pop();
+
+			if (call.type == 'CREATE' || call.type == "CREATE2") {
+				// If the call was a CREATE, retrieve the contract address and output code
+				call.gasUsed = '0x' + bigInt(call.gasIn - call.gasCost - log.getGas()).toString(16);
+				delete call.gasIn; delete call.gasCost;
+
+				var ret = log.stack.peek(0);
+				if (!ret.equals(0)) {
+					call.to     = toHex(toAddress(ret.toString(16)));
+					call.output = toHex(db.getCode(toAddress(ret.toString(16))));
+				} else if (call.error === undefined) {
+					call.error = "internal failure"; // TODO(karalabe): surface these faults somehow
+				}
+			} else {
+				// If the call was a contract call, retrieve the gas usage and output
+				if (call.gas !== undefined) {
+					call.gasUsed = '0x' + bigInt(call.gasIn - call.gasCost + call.gas - log.getGas()).toString(16);
+
+					var ret = log.stack.peek(0);
+					if (!ret.equals(0)) {
+						call.output = toHex(log.memory.slice(call.outOff, call.outOff + call.outLen));
+					} else if (call.error === undefined) {
+						call.error = "internal failure"; // TODO(karalabe): surface these faults somehow
+					}
+				}
+				delete call.gasIn; delete call.gasCost;
+				delete call.outOff; delete call.outLen;
+			}
+			if (call.gas !== undefined) {
+				call.gas = '0x' + bigInt(call.gas).toString(16);
+			}
+			// Inject the call into the previous one
+			var left = this.callstack.length;
+			if (this.callstack[left-1].calls === undefined) {
+				this.callstack[left-1].calls = [];
+			}
+			this.callstack[left-1].calls.push(call);
+		}
+	},
+
+	// fault is invoked when the actual execution of an opcode fails.
+	fault: function(log, db) {
+		// If the topmost call already reverted, don't handle the additional fault again
+		if (this.callstack[this.callstack.length - 1].error !== undefined) {
+			return;
+		}
+		// Pop off the just failed call
+		var call = this.callstack.pop();
+		call.error = log.getError();
+
+		// Consume all available gas and clean any leftovers
+		if (call.gas !== undefined) {
+			call.gas = '0x' + bigInt(call.gas).toString(16);
+			call.gasUsed = call.gas
+		}
+		delete call.gasIn; delete call.gasCost;
+		delete call.outOff; delete call.outLen;
+
+		// Flatten the failed call into its parent
+		var left = this.callstack.length;
+		if (left > 0) {
+			if (this.callstack[left-1].calls === undefined) {
+				this.callstack[left-1].calls = [];
+			}
+			this.callstack[left-1].calls.push(call);
+			return;
+		}
+		// Last call failed too, leave it in the stack
+		this.callstack.push(call);
+	},
+
+	// result is invoked when all the opcodes have been iterated over and returns
+	// the final result of the tracing.
+	result: function(ctx, db) {
+		var result = {
+			type:    ctx.type,
+			from:    toHex(ctx.from),
+			to:      toHex(ctx.to),
+			value:   '0x' + ctx.value.toString(16),
+			gas:     '0x' + bigInt(ctx.gas).toString(16),
+			gasUsed: '0x' + bigInt(ctx.gasUsed).toString(16),
+			input:   toHex(ctx.input),
+			output:  toHex(ctx.output),
+			time:    ctx.time,
+		};
+		if (this.callstack[0].calls !== undefined) {
+			result.calls = this.callstack[0].calls;
+		}
+		if (this.callstack[0].error !== undefined) {
+			result.error = this.callstack[0].error;
+		} else if (ctx.error !== undefined) {
+			result.error = ctx.error;
+		}
+		if (result.error !== undefined) {
+			delete result.output;
+		}
+		return this.finalize(result);
+	},
+
+	// finalize recreates a call object using the final desired field oder for json
+	// serialization. This is a nicety feature to pass meaningfully ordered results
+	// to users who don't interpret it, just display it.
+	finalize: function(call) {
+		var sorted = {
+			type:    call.type,
+			from:    call.from,
+			to:      call.to,
+			value:   call.value,
+			gas:     call.gas,
+			gasUsed: call.gasUsed,
+			input:   call.input,
+			output:  call.output,
+			error:   call.error,
+			time:    call.time,
+			calls:   call.calls,
+		}
+		for (var key in sorted) {
+			if (sorted[key] === undefined) {
+				delete sorted[key];
+			}
+		}
+		if (sorted.calls !== undefined) {
+			for (var i=0; i<sorted.calls.length; i++) {
+				sorted.calls[i] = this.finalize(sorted.calls[i]);
+			}
+		}
+		return sorted;
+	}
+}
diff --git a/eth/tracers/internal/tracers/evmdis_tracer.js b/eth/tracers/internal/tracers/evmdis_tracer.js
new file mode 100644
index 0000000..bb19777
--- /dev/null
+++ b/eth/tracers/internal/tracers/evmdis_tracer.js
@@ -0,0 +1,93 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// evmdisTracer returns sufficient information from a trace to perform evmdis-style
+// disassembly.
+{
+	stack: [{ops: []}],
+
+	npushes: {0: 0, 1: 1, 2: 1, 3: 1, 4: 1, 5: 1, 6: 1, 7: 1, 8: 1, 9: 1, 10: 1, 11: 1, 16: 1, 17: 1, 18: 1, 19: 1, 20: 1, 21: 1, 22: 1, 23: 1, 24: 1, 25: 1, 26: 1, 32: 1, 48: 1, 49: 1, 50: 1, 51: 1, 52: 1, 53: 1, 54: 1, 55: 0, 56: 1, 57: 0, 58: 1, 59: 1, 60: 0, 64: 1, 65: 1, 66: 1, 67: 1, 68: 1, 69: 1, 80: 0, 81: 1, 82: 0, 83: 0, 84: 1, 85: 0, 86: 0, 87: 0, 88: 1, 89: 1, 90: 1, 91: 0, 96: 1, 97: 1, 98: 1, 99: 1, 100: 1, 101: 1, 102: 1, 103: 1, 104: 1, 105: 1, 106: 1, 107: 1, 108: 1, 109: 1, 110: 1, 111: 1, 112: 1, 113: 1, 114: 1, 115: 1, 116: 1, 117: 1, 118: 1, 119: 1, 120: 1, 121: 1, 122: 1, 123: 1, 124: 1, 125: 1, 126: 1, 127: 1, 128: 2, 129: 3, 130: 4, 131: 5, 132: 6, 133: 7, 134: 8, 135: 9, 136: 10, 137: 11, 138: 12, 139: 13, 140: 14, 141: 15, 142: 16, 143: 17, 144: 2, 145: 3, 146: 4, 147: 5, 148: 6, 149: 7, 150: 8, 151: 9, 152: 10, 153: 11, 154: 12, 155: 13, 156: 14, 157: 15, 158: 16, 159: 17, 160: 0, 161: 0, 162: 0, 163: 0, 164: 0, 240: 1, 241: 1, 242: 1, 243: 0, 244: 0, 255: 0},
+
+	// result is invoked when all the opcodes have been iterated over and returns
+	// the final result of the tracing.
+	result: function() { return this.stack[0].ops; },
+
+	// fault is invoked when the actual execution of an opcode fails.
+	fault: function(log, db) { },
+
+	// step is invoked for every opcode that the VM executes.
+	step: function(log, db) {
+		var frame = this.stack[this.stack.length - 1];
+
+		var error = log.getError();
+		if (error) {
+			frame["error"] = error;
+		} else if (log.getDepth() == this.stack.length) {
+			opinfo = {
+				op:     log.op.toNumber(),
+				depth : log.getDepth(),
+				result: [],
+			};
+			if (frame.ops.length > 0) {
+				var prevop = frame.ops[frame.ops.length - 1];
+				for(var i = 0; i < this.npushes[prevop.op]; i++)
+					prevop.result.push(log.stack.peek(i).toString(16));
+			}
+			switch(log.op.toString()) {
+			case "CALL": case "CALLCODE":
+				var instart = log.stack.peek(3).valueOf();
+				var insize = log.stack.peek(4).valueOf();
+				opinfo["gas"] = log.stack.peek(0).valueOf();
+				opinfo["to"] = log.stack.peek(1).toString(16);
+				opinfo["value"] = log.stack.peek(2).toString();
+				opinfo["input"] = log.memory.slice(instart, instart + insize);
+				opinfo["error"] = null;
+				opinfo["return"] = null;
+				opinfo["ops"] = [];
+				this.stack.push(opinfo);
+				break;
+			case "DELEGATECALL": case "STATICCALL":
+				var instart = log.stack.peek(2).valueOf();
+				var insize = log.stack.peek(3).valueOf();
+				opinfo["op"] =  log.op.toString();
+				opinfo["gas"] =  log.stack.peek(0).valueOf();
+				opinfo["to"] =  log.stack.peek(1).toString(16);
+				opinfo["input"] =  log.memory.slice(instart, instart + insize);
+				opinfo["error"] =  null;
+				opinfo["return"] =  null;
+				opinfo["ops"] = [];
+				this.stack.push(opinfo);
+				break;
+			case "RETURN":
+				var out = log.stack.peek(0).valueOf();
+				var outsize = log.stack.peek(1).valueOf();
+				frame.return = log.memory.slice(out, out + outsize);
+				break;
+			case "STOP": case "SUICIDE":
+				frame.return = log.memory.slice(0, 0);
+				break;
+			case "JUMPDEST":
+				opinfo["pc"] = log.getPC();
+			}
+			if(log.op.isPush()) {
+				opinfo["len"] = log.op.toNumber() - 0x5e;
+			}
+			frame.ops.push(opinfo);
+		} else {
+			this.stack = this.stack.slice(0, log.getDepth());
+		}
+	}
+}
diff --git a/eth/tracers/internal/tracers/noop_tracer.js b/eth/tracers/internal/tracers/noop_tracer.js
new file mode 100644
index 0000000..fe7ddc8
--- /dev/null
+++ b/eth/tracers/internal/tracers/noop_tracer.js
@@ -0,0 +1,29 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// noopTracer is just the barebone boilerplate code required from a JavaScript
+// object to be usable as a transaction tracer.
+{
+	// step is invoked for every opcode that the VM executes.
+	step: function(log, db) { },
+
+	// fault is invoked when the actual execution of an opcode fails.
+	fault: function(log, db) { },
+
+	// result is invoked when all the opcodes have been iterated over and returns
+	// the final result of the tracing.
+	result: function(ctx, db) { return {}; }
+}
diff --git a/eth/tracers/internal/tracers/opcount_tracer.js b/eth/tracers/internal/tracers/opcount_tracer.js
new file mode 100644
index 0000000..f7984c7
--- /dev/null
+++ b/eth/tracers/internal/tracers/opcount_tracer.js
@@ -0,0 +1,32 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// opcountTracer is a sample tracer that just counts the number of instructions
+// executed by the EVM before the transaction terminated.
+{
+	// count tracks the number of EVM instructions executed.
+	count: 0,
+
+	// step is invoked for every opcode that the VM executes.
+	step: function(log, db) { this.count++ },
+
+	// fault is invoked when the actual execution of an opcode fails.
+	fault: function(log, db) { },
+
+	// result is invoked when all the opcodes have been iterated over and returns
+	// the final result of the tracing.
+	result: function(ctx, db) { return this.count }
+}
diff --git a/eth/tracers/internal/tracers/prestate_tracer.js b/eth/tracers/internal/tracers/prestate_tracer.js
new file mode 100644
index 0000000..e0a22bf
--- /dev/null
+++ b/eth/tracers/internal/tracers/prestate_tracer.js
@@ -0,0 +1,108 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// prestateTracer outputs sufficient information to create a local execution of
+// the transaction from a custom assembled genesis block.
+{
+	// prestate is the genesis that we're building.
+	prestate: null,
+
+	// lookupAccount injects the specified account into the prestate object.
+	lookupAccount: function(addr, db){
+		var acc = toHex(addr);
+		if (this.prestate[acc] === undefined) {
+			this.prestate[acc] = {
+				balance: '0x' + db.getBalance(addr).toString(16),
+				nonce:   db.getNonce(addr),
+				code:    toHex(db.getCode(addr)),
+				storage: {}
+			};
+		}
+	},
+
+	// lookupStorage injects the specified storage entry of the given account into
+	// the prestate object.
+	lookupStorage: function(addr, key, db){
+		var acc = toHex(addr);
+		var idx = toHex(key);
+
+		if (this.prestate[acc].storage[idx] === undefined) {
+			this.prestate[acc].storage[idx] = toHex(db.getState(addr, key));
+		}
+	},
+
+	// result is invoked when all the opcodes have been iterated over and returns
+	// the final result of the tracing.
+	result: function(ctx, db) {
+		// At this point, we need to deduct the 'value' from the
+		// outer transaction, and move it back to the origin
+		this.lookupAccount(ctx.from, db);
+
+		var fromBal = bigInt(this.prestate[toHex(ctx.from)].balance.slice(2), 16);
+		var toBal   = bigInt(this.prestate[toHex(ctx.to)].balance.slice(2), 16);
+
+		this.prestate[toHex(ctx.to)].balance   = '0x'+toBal.subtract(ctx.value).toString(16);
+		this.prestate[toHex(ctx.from)].balance = '0x'+fromBal.add(ctx.value).toString(16);
+
+		// Decrement the caller's nonce, and remove empty create targets
+		this.prestate[toHex(ctx.from)].nonce--;
+		if (ctx.type == 'CREATE') {
+			// We can blibdly delete the contract prestate, as any existing state would
+			// have caused the transaction to be rejected as invalid in the first place.
+			delete this.prestate[toHex(ctx.to)];
+		}
+		// Return the assembled allocations (prestate)
+		return this.prestate;
+	},
+
+	// step is invoked for every opcode that the VM executes.
+	step: function(log, db) {
+		// Add the current account if we just started tracing
+		if (this.prestate === null){
+			this.prestate = {};
+			// Balance will potentially be wrong here, since this will include the value
+			// sent along with the message. We fix that in 'result()'.
+			this.lookupAccount(log.contract.getAddress(), db);
+		}
+		// Whenever new state is accessed, add it to the prestate
+		switch (log.op.toString()) {
+			case "EXTCODECOPY": case "EXTCODESIZE": case "BALANCE":
+				this.lookupAccount(toAddress(log.stack.peek(0).toString(16)), db);
+				break;
+			case "CREATE":
+				var from = log.contract.getAddress();
+				this.lookupAccount(toContract(from, db.getNonce(from)), db);
+				break;
+			case "CREATE2":
+				var from = log.contract.getAddress();
+				// stack: salt, size, offset, endowment
+				var offset = log.stack.peek(1).valueOf()
+				var size = log.stack.peek(2).valueOf()
+				var end = offset + size
+				this.lookupAccount(toContract2(from, log.stack.peek(3).toString(16), log.memory.slice(offset, end)), db);
+				break;
+			case "CALL": case "CALLCODE": case "DELEGATECALL": case "STATICCALL":
+				this.lookupAccount(toAddress(log.stack.peek(1).toString(16)), db);
+				break;
+			case 'SSTORE':case 'SLOAD':
+				this.lookupStorage(log.contract.getAddress(), toWord(log.stack.peek(0).toString(16)), db);
+				break;
+		}
+	},
+
+	// fault is invoked when the actual execution of an opcode fails.
+	fault: function(log, db) {}
+}
diff --git a/eth/tracers/internal/tracers/tracers.go b/eth/tracers/internal/tracers/tracers.go
new file mode 100644
index 0000000..2e40975
--- /dev/null
+++ b/eth/tracers/internal/tracers/tracers.go
@@ -0,0 +1,21 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//go:generate go-bindata -nometadata -o assets.go -pkg tracers -ignore tracers.go -ignore assets.go ./...
+//go:generate gofmt -s -w assets.go
+
+// Package tracers contains the actual JavaScript tracer assets.
+package tracers
diff --git a/eth/tracers/internal/tracers/trigram_tracer.js b/eth/tracers/internal/tracers/trigram_tracer.js
new file mode 100644
index 0000000..8756490
--- /dev/null
+++ b/eth/tracers/internal/tracers/trigram_tracer.js
@@ -0,0 +1,49 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+{
+    // hist is the map of trigram counters
+    hist: {},
+    // lastOp is last operation
+    lastOps: ['',''],
+    lastDepth: 0,
+        // step is invoked for every opcode that the VM executes.
+    step: function(log, db) {
+        var depth = log.getDepth();
+        if (depth != this.lastDepth){
+            this.lastOps = ['',''];
+            this.lastDepth = depth;
+            return;
+        }
+        var op = log.op.toString();
+        var key = this.lastOps[0]+'-'+this.lastOps[1]+'-'+op;
+        if (this.hist[key]){
+            this.hist[key]++;
+        }
+        else {
+            this.hist[key] = 1;
+        }
+        this.lastOps[0] = this.lastOps[1];
+        this.lastOps[1] = op;
+    },
+    // fault is invoked when the actual execution of an opcode fails.
+    fault: function(log, db) {},
+    // result is invoked when all the opcodes have been iterated over and returns
+    // the final result of the tracing.
+    result: function(ctx) {
+        return this.hist;
+    },
+}
diff --git a/eth/tracers/internal/tracers/unigram_tracer.js b/eth/tracers/internal/tracers/unigram_tracer.js
new file mode 100644
index 0000000..000fb13
--- /dev/null
+++ b/eth/tracers/internal/tracers/unigram_tracer.js
@@ -0,0 +1,43 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+{
+    // hist is the map of opcodes to counters
+    hist: {},
+    // nops counts number of ops
+    nops: 0,
+    // step is invoked for every opcode that the VM executes.
+    step: function(log, db) {
+        var op = log.op.toString();
+        if (this.hist[op]){
+            this.hist[op]++;
+        }
+        else {
+            this.hist[op] = 1;
+        }
+        this.nops++;
+    },
+    // fault is invoked when the actual execution of an opcode fails.
+    fault: function(log, db) {},
+
+    // result is invoked when all the opcodes have been iterated over and returns
+    // the final result of the tracing.
+    result: function(ctx) {
+        if(this.nops > 0){
+            return this.hist;
+        }
+    },
+}