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debug.go
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debug.go
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package debug
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
"github.com/bovarysme/bmo/beemo"
)
type Debugger struct {
bmo *beemo.BMO
reader *bufio.Reader
running bool
breaking bool
breakpoint uint16
}
func NewDebugger(bmo *beemo.BMO) *Debugger {
return &Debugger{
bmo: bmo,
reader: bufio.NewReader(os.Stdin),
running: true,
}
}
func (d *Debugger) Run() error {
fmt.Println("Running in debug mode.")
for d.running {
fmt.Println(d.bmo)
fmt.Print("> ")
command, args, err := d.parseInput()
if err != nil {
return err
}
d.execute(command, args)
fmt.Println()
}
return nil
}
func (d *Debugger) parseInput() (string, []string, error) {
input, err := d.reader.ReadString('\n')
if err != nil {
return "", nil, err
}
input = strings.TrimRight(input, "\n")
args := strings.Split(input, " ")
return args[0], args[1:], nil
}
func (d *Debugger) execute(command string, args []string) error {
if command == "b" || command == "break" {
if len(args) < 1 {
fmt.Println("You must specify an address.")
return nil
}
address, err := strconv.ParseInt(args[0], 16, 0)
if err != nil {
fmt.Println("Invalid address.")
return nil
}
d.breaking = true
d.breakpoint = uint16(address)
fmt.Printf("Breakpoint set: %#04x.\n", d.breakpoint)
} else if command == "c" || command == "clear" {
d.breaking = false
fmt.Println("Breakpoint cleared.")
} else if command == "r" || command == "run" {
if !d.breaking {
fmt.Println("You must set a breakpoint first.")
return nil
}
for {
err := d.bmo.Step()
if err != nil {
return err
}
if d.bmo.GetPC() == d.breakpoint {
break
}
}
fmt.Println("Breakpoint reached.")
} else if command == "" || command == "s" || command == "step" {
err := d.bmo.Step()
if err != nil {
return err
}
} else if command == "q" || command == "quit" {
d.running = false
fmt.Print("Goodbye!")
} else {
fmt.Println("Unknown command.")
}
return nil
}