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rewind.go
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rewind.go
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// This file is part of Gopher2600.
//
// Gopher2600 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Gopher2600 is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
package debugger
// support functions for the rewind package that require more knowledge of
// the debugger than would otherwise be available.
import (
"fmt"
"github.com/jetsetilly/gopher2600/debugger/govern"
"github.com/jetsetilly/gopher2600/gui"
"github.com/jetsetilly/gopher2600/hardware/television/coords"
"github.com/jetsetilly/gopher2600/logger"
"github.com/jetsetilly/gopher2600/notifications"
)
// RewindByAmount moves forwards or backwards by specified frames. Negative
// numbers indicate backwards
func (dbg *Debugger) RewindByAmount(amount int) bool {
switch dbg.Mode() {
default:
panic(fmt.Sprintf("Rewind: unsupported mode (%v)", dbg.Mode()))
case govern.ModePlay:
coords := dbg.vcs.TV.GetCoords()
tl := dbg.Rewind.GetTimeline()
if amount < 0 && coords.Frame-1 <= tl.AvailableStart {
dbg.setStateQuiet(govern.Paused, true)
err := dbg.gui.SetFeature(gui.ReqEmulationNotice, notifications.NotifyRewindAtStart)
if err != nil {
logger.Log("debugger", err.Error())
}
return false
}
if amount > 0 && coords.Frame+1 >= tl.AvailableEnd {
dbg.setStateQuiet(govern.Paused, true)
err := dbg.gui.SetFeature(gui.ReqEmulationNotice, notifications.NotifyRewindAtEnd)
if err != nil {
logger.Log("debugger", err.Error())
}
return false
}
dbg.setStateQuiet(govern.Rewinding, true)
dbg.Rewind.GotoFrame(coords.Frame + amount)
dbg.setStateQuiet(govern.Paused, true)
var err error
if amount < 0 {
err = dbg.gui.SetFeature(gui.ReqEmulationNotice, notifications.NotifyRewindBack)
} else {
err = dbg.gui.SetFeature(gui.ReqEmulationNotice, notifications.NotifyRewindFoward)
}
if err != nil {
logger.Log("debugger", err.Error())
}
return true
}
return false
}
// RewindToFrame measure from the current frame.
func (dbg *Debugger) RewindToFrame(fn int, last bool) bool {
switch dbg.Mode() {
default:
panic(fmt.Sprintf("RewindToFrame: unsupported mode (%v)", dbg.Mode()))
case govern.ModeDebugger:
if dbg.State() == govern.Rewinding {
return false
}
// the function to push to the debugger/emulation routine
doRewind := func() error {
// upate catchupQuantum before starting rewind process
dbg.catchupQuantum = dbg.stepQuantum
if last {
err := dbg.Rewind.GotoLast()
if err != nil {
return err
}
} else {
err := dbg.Rewind.GotoFrame(fn)
if err != nil {
return err
}
}
return nil
}
// how we push the doRewind() function depends on what kind of inputloop we
// are currently in
dbg.PushFunctionImmediate(func() {
// set state to govern.Rewinding as soon as possible (but
// remembering that we must do it in the debugger goroutine)
dbg.setState(govern.Rewinding)
dbg.unwindLoop(doRewind)
})
return true
}
return false
}
// GotoCoords rewinds the emulation to the specified coordinates.
func (dbg *Debugger) GotoCoords(coords coords.TelevisionCoords) bool {
switch dbg.Mode() {
default:
panic(fmt.Sprintf("GotoCoords: unsupported mode (%v)", dbg.Mode()))
case govern.ModeDebugger:
if dbg.State() == govern.Rewinding {
return false
}
// the function to push to the debugger/emulation routine
doRewind := func() error {
// upate catchupQuantum before starting rewind process
dbg.catchupQuantum = QuantumClock
err := dbg.Rewind.GotoCoords(coords)
if err != nil {
return err
}
return nil
}
// how we push the doRewind() function depends on what kind of inputloop we
// are currently in
dbg.PushFunctionImmediate(func() {
// set state to govern.Rewinding as soon as possible (but
// remembering that we must do it in the debugger goroutine)
dbg.setState(govern.Rewinding)
dbg.unwindLoop(doRewind)
})
return true
}
return false
}
// RerunLastNFrames measured from the current frame.
func (dbg *Debugger) RerunLastNFrames(frames int) bool {
switch dbg.Mode() {
default:
panic(fmt.Sprintf("RerunLastNFrames: unsupported mode (%v)", dbg.Mode()))
case govern.ModeDebugger:
if dbg.State() == govern.Rewinding {
return false
}
// the disadvantage of RerunLastNFrames() is that it will always land on a
// CPU instruction boundary (this is because we must unwind the existing
// input loop before calling the rewind function)
//
// if we're in between instruction boundaries therefore we need to push a
// GotoCoords() request. get the current coordinates now
correctCoords := !dbg.liveDisasmEntry.Result.Final
coords := dbg.vcs.TV.GetCoords()
// the function to push to the debugger/emulation routine
doRewind := func() error {
err := dbg.Rewind.RerunLastNFrames(frames)
if err != nil {
return err
}
if correctCoords {
err = dbg.Rewind.GotoCoords(coords)
if err != nil {
return err
}
}
return nil
}
// how we push the doRewind() function depends on what kind of inputloop we
// are currently in
dbg.PushFunctionImmediate(func() {
// upate catchupQuantum before starting rewind process
dbg.catchupQuantum = QuantumClock
// set state to govern.Rewinding as soon as possible (but
// remembering that we must do it in the debugger goroutine)
dbg.setState(govern.Rewinding)
dbg.unwindLoop(doRewind)
})
return true
}
return false
}