Step vs. continue

internal/debug/repl.go

@@ -11,6 +11,7 @@ import (
 
 const replUsage = `Commands:
  s, step -- Step through events
+ c, continue -- Continue execution until a breakpoint is reached or the module exits
  r, restart -- Restart the debugger
  q, quit -- Quit the debugger
  h, help -- Show this usage information
@@ -26,10 +27,11 @@ var (
 
 // REPL provides a read-eval-print loop for debugging WebAssembly modules.
 type REPL struct {
- input *bufio.Scanner
- tracer *Tracer
- writer io.Writer
- closed bool
+ input *bufio.Scanner
+ tracer *Tracer
+ writer io.Writer
+ stepping bool
+ closed bool
 }
 
 // NewREPL creates a new REPL using the specified input and writer stream.
@@ -48,18 +50,13 @@ func (r *REPL) OnEvent(ctx context.Context, event Event) {
 
  r.tracer.OnEvent(ctx, event)
 
+ // TODO: support breakpoints
+ executing := true
  switch event.(type) {
- case *ModuleBeforeEvent:
- case *ModuleAfterEvent:
- case *FunctionCallBeforeEvent:
- return
- case *FunctionCallAfterEvent:
- return
- case *FunctionCallAbortEvent:
- return
- case *SystemCallBeforeEvent:
- return
- case *SystemCallAfterEvent:
+ case *ModuleBeforeEvent, *ModuleAfterEvent:
+ executing = false
+ }
+ if executing && !r.stepping {
  return
  }
 
@@ -76,15 +73,17 @@ read_input:
 
  switch command {
  case "s", "step":
- // TODO
+ r.stepping = true
+
+ case "c", "continue":
+ r.stepping = false
 
  case "r", "restart":
- r.print("Restarting the debugger\n")
+ r.print("Restarting...\n")
  r.closed = true
  panic(RestartError)
 
  case "q", "quit":
- r.print("Quitting the debugger\n")
  r.closed = true
  panic(QuitError)