feat(debug): headless script mode with timeout watchdog

debug/repl.go

@@ -8,7 +8,7 @@ package debug
 import (
 	"bufio"
 	"fmt"
-	"os"
+	"io"
 	"sort"
 	"strconv"
 	"strings"
@@ -26,14 +26,15 @@ type SourceLine struct {
 	Line   int
 }
 
-// REPL runs the interactive debugger loop.
-func REPL(s *Session, bm *Breakpoints, codeBase uint64, funcOffset, funcSize, argsSize int, labels []Label, lines []SourceLine) {
+// REPL runs the interactive debugger loop, reading commands from in (pass
+// os.Stdin interactively, or a bytes.Reader/script file for headless runs).
+func REPL(s *Session, bm *Breakpoints, codeBase uint64, funcOffset, funcSize, argsSize int, labels []Label, lines []SourceLine, in io.Reader) {
 	entryAddr := codeBase + uint64(funcOffset)
 
 	fmt.Printf("stopped at function entry: %#x (%d bytes)\n", entryAddr, funcSize)
 	fmt.Println("commands: break <label|addr> | step [n] | continue | disas [n] | regs | where | x <addr> [len] | w <addr> <val...> | labels | quit")
 
-	scanner := bufio.NewScanner(os.Stdin)
+	scanner := bufio.NewScanner(in)
 
 	for {
 		fmt.Print("(gasm) ")