Merge pull request #16954 from holiman/more_tracers

eth/tracers: fix err in 4byte, add some opcode analysis tools

5 files changed, 214 insertions, 3 deletions

diff --git a/eth/tracers/internal/tracers/4byte_tracer.js b/eth/tracers/internal/tracers/4byte_tracer.js
index 2629aba3c..462b4ad4c 100644
--- a/eth/tracers/internal/tracers/4byte_tracer.js
+++ b/eth/tracers/internal/tracers/4byte_tracer.js
@@ -60,7 +60,7 @@
 			return;
 		}
 		// Skip any pre-compile invocations, those are just fancy opcodes
-		if (isPrecompiled(toAddress(log.stack.peek(1)))) {
+		if (isPrecompiled(toAddress(log.stack.peek(1).toString(16)))) {
 			return;
 		}
 		// Gather internal call details
diff --git a/eth/tracers/internal/tracers/assets.go b/eth/tracers/internal/tracers/assets.go
index 2fdf5a646..a3963b53b 100644
--- a/eth/tracers/internal/tracers/assets.go
+++ b/eth/tracers/internal/tracers/assets.go
@@ -1,11 +1,14 @@
 // Code generated by go-bindata. DO NOT EDIT.
 // sources:
 // 4byte_tracer.js
+// bigram_tracer.js
 // call_tracer.js
 // evmdis_tracer.js
 // noop_tracer.js
 // opcount_tracer.js
 // prestate_tracer.js
+// trigram_tracer.js
+// unigram_tracer.js
 
 package tracers
 
@@ -74,7 +77,7 @@ func (fi bindataFileInfo) Sys() interface{} {
 	return nil
 }
 
-var __4byte_tracerJs = 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+var __4byte_tracerJs = 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
 func _4byte_tracerJsBytes() ([]byte, error) {
 	return bindataRead(
@@ -90,7 +93,27 @@ func _4byte_tracerJs() (*asset, error) {
 	}
 
 	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{0xdc, 0x44, 0x40, 0x64, 0xa7, 0xa2, 0x19, 0xea, 0x36, 0x7, 0xf8, 0x62, 0x5, 0x90, 0xda, 0x9c, 0xc1, 0x71, 0xab, 0xc6, 0x14, 0x63, 0xe5, 0x52, 0x34, 0xb9, 0x53, 0x9b, 0x89, 0x2, 0x5b, 0xa4}}
+	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
 }
 
@@ -194,6 +217,46 @@ func prestate_tracerJs() (*asset, error) {
 	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.
@@ -287,6 +350,8 @@ func AssetNames() []string {
 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,
@@ -296,6 +361,10 @@ var _bindata = map[string]func() (*asset, error){
 	"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
@@ -340,11 +409,14 @@ type bintree struct {
 
 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.
diff --git a/eth/tracers/internal/tracers/bigram_tracer.js b/eth/tracers/internal/tracers/bigram_tracer.js
new file mode 100644
index 000000000..421c360af
--- /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/trigram_tracer.js b/eth/tracers/internal/tracers/trigram_tracer.js
new file mode 100644
index 000000000..8756490df
--- /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 000000000..000fb13b1
--- /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;
+        }
+    },
+}