Opcode tracer (#1320)

* OpcodeTracer

* Cleanup, rename to opcode_tracer

* Bring back check_change_sets, remove repeated vars

* Cleanup, gofmt

* Linter, cleanup

* Rename "segments" to "basic blocks", "bblocks"

* gofmt

* Lintci madness

cmd/state/commands/opcode_tracer.go

@@ -0,0 +1,30 @@
+package commands
+
+import (
+	"github.com/ledgerwatch/turbo-geth/cmd/state/stateless"
+	"github.com/spf13/cobra"
+)
+
+var (
+	numBlocks   uint64
+	saveOpcodes bool
+	saveBBlocks bool
+)
+
+func init() {
+	withBlock(opcodeTracer)
+	withChaindata(opcodeTracer)
+	opcodeTracer.Flags().Uint64Var(&numBlocks, "numBlocks", 1, "number of blocks to run the operation on")
+	opcodeTracer.Flags().BoolVar(&saveOpcodes, "saveOpcodes", false, "set to save the opcodes")
+	opcodeTracer.Flags().BoolVar(&saveBBlocks, "saveBBlocks", false, "set to save the basic blocks")
+
+	rootCmd.AddCommand(opcodeTracer)
+}
+
+var opcodeTracer = &cobra.Command{
+	Use:   "opcodeTracer",
+	Short: "Re-executes historical transactions in read-only mode and traces them at the opcode level",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return stateless.OpcodeTracer(genesis, block, chaindata, numBlocks, saveOpcodes, saveBBlocks)
+	},
+}