eth/tracers: fix minor off-by-one error (#16879)

* tracing: fix minor off-by-one error

* tracers: go generate

eth/tracers/internal/tracers/4byte_tracer.js

@@ -78,7 +78,7 @@
 	// the final result of the tracing.
 	result: function(ctx) {
 		// Save the outer calldata also
-		if (ctx.input.length > 4) {
+		if (ctx.input.length >= 4) {
 			this.store(slice(ctx.input, 0, 4), ctx.input.length-4)
 		}
 		return this.ids;

eth/tracers/internal/tracers/assets.go

@@ -12,6 +12,7 @@ package tracers
 import (
 	"bytes"
 	"compress/gzip"
+	"crypto/sha256"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -44,6 +45,7 @@ func bindataRead(data []byte, name string) ([]byte, error) {
 type asset struct {
 	bytes  []byte
 	info   os.FileInfo
+	digest [sha256.Size]byte
 }
 
 type bindataFileInfo struct {
@@ -72,7 +74,7 @@ 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(
@@ -88,7 +90,7 @@ 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}
+	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}}
 	return a, nil
 }
 
@@ -108,7 +110,7 @@ func call_tracerJs() (*asset, error) {
 	}
 
 	info := bindataFileInfo{name: "call_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
-	a := &asset{bytes: bytes, info: info}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0xf5, 0xb3, 0xb6, 0xe8, 0x19, 0xc3, 0xa, 0xce, 0xfd, 0x50, 0x84, 0xf7, 0x8a, 0xc5, 0x99, 0x10, 0x58, 0xc4, 0x69, 0xfb, 0x8, 0xad, 0x67, 0xea, 0x12, 0x38, 0xcb, 0xd, 0x2a, 0x94, 0xa1, 0x70}}
 	return a, nil
 }
 
@@ -128,7 +130,7 @@ func evmdis_tracerJs() (*asset, error) {
 	}
 
 	info := bindataFileInfo{name: "evmdis_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
-	a := &asset{bytes: bytes, info: info}
+	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
 }
 
@@ -148,7 +150,7 @@ func noop_tracerJs() (*asset, error) {
 	}
 
 	info := bindataFileInfo{name: "noop_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
-	a := &asset{bytes: bytes, info: info}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0x4d, 0xcc, 0x83, 0xe9, 0x9e, 0xc1, 0x56, 0x41, 0x6c, 0x6a, 0x3b, 0x46, 0xc9, 0x5f, 0xe1, 0x5b, 0xcd, 0x6b, 0x53, 0x45, 0xcd, 0xfe, 0x1e, 0x86, 0x8c, 0x6b, 0xb, 0x70, 0x73, 0x9f, 0x4c, 0xb1}}
 	return a, nil
 }
 
@@ -168,7 +170,7 @@ func opcount_tracerJs() (*asset, error) {
 	}
 
 	info := bindataFileInfo{name: "opcount_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
-	a := &asset{bytes: bytes, info: info}
+	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
 }
 
@@ -188,7 +190,7 @@ func prestate_tracerJs() (*asset, error) {
 	}
 
 	info := bindataFileInfo{name: "prestate_tracer.js", size: 0, mode: os.FileMode(0), modTime: time.Unix(0, 0)}
-	a := &asset{bytes: bytes, info: info}
+	a := &asset{bytes: bytes, info: info, digest: [32]uint8{0xd0, 0xd5, 0x5, 0x92, 0xed, 0xf4, 0x69, 0x2e, 0x14, 0x48, 0x35, 0x67, 0xcc, 0xf2, 0x3e, 0xc7, 0xf, 0x18, 0x22, 0x7a, 0x4d, 0x6f, 0x31, 0xad, 0x3c, 0x92, 0x77, 0xb4, 0x1, 0x2a, 0xd3, 0x7c}}
 	return a, nil
 }
 
@@ -207,6 +209,12 @@ func Asset(name string) ([]byte, error) {
 	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 {
@@ -218,6 +226,12 @@ func MustAsset(name string) []byte {
 	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.
@@ -233,6 +247,33 @@ func AssetInfo(name string) (os.FileInfo, error) {
 	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))
@@ -266,9 +307,9 @@ var _bindata = map[string]func() (*asset, error){
 //       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
+// 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
@@ -306,7 +347,7 @@ var _bintree = &bintree{nil, map[string]*bintree{
 	"prestate_tracer.js": {prestate_tracerJs, map[string]*bintree{}},
 }}
 
-// RestoreAsset restores an asset under the given directory
+// RestoreAsset restores an asset under the given directory.
 func RestoreAsset(dir, name string) error {
 	data, err := Asset(name)
 	if err != nil {
@@ -327,7 +368,7 @@ func RestoreAsset(dir, name string) error {
 	return os.Chtimes(_filePath(dir, name), info.ModTime(), info.ModTime())
 }
 
-// RestoreAssets restores an asset under the given directory recursively
+// RestoreAssets restores an asset under the given directory recursively.
 func RestoreAssets(dir, name string) error {
 	children, err := AssetDir(name)
 	// File