mirror of
https://github.com/JetSetIlly/Gopher2600.git
synced 2024-06-02 12:08:01 -04:00
28ffedbf11
the emulation package has been unecessary since the amalgamation of the debugger and play modes. in order to allow switching between the two modes it was necessary to remove the playmode package and to move all playmode loops and other considerations into the debugger package. as a result the abstraction offered by the emulation package is uncessary
83 lines
2.6 KiB
Go
83 lines
2.6 KiB
Go
// This file is part of Gopher2600.
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//
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// Gopher2600 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Gopher2600 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
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package lazyvalues
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import (
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"sync/atomic"
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"github.com/jetsetilly/gopher2600/debugger"
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"github.com/jetsetilly/gopher2600/debugger/govern"
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"github.com/jetsetilly/gopher2600/disassembly"
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)
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// LazyDebugger lazily accesses Debugger information.
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type LazyDebugger struct {
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val *LazyValues
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quantum atomic.Value // debugger.QuantumMode
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liveDisasmEntry atomic.Value // disassembly.Entry
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breakpoints atomic.Value // debugger.BreakpointsQuery
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hasChanged atomic.Value // bool
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state atomic.Value // govern.State
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Quantum debugger.Quantum
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LiveDisasmEntry disassembly.Entry
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Breakpoints debugger.BreakpointsQuery
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HasChanged bool
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// the govern.State below is taken at the same time as the reset of the
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// lazy values. this value should be used in preference to the live
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// govern.State() value (which is safe to obtain outside of the lazy
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// system) when synchronisation is important
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State govern.State
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}
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func newLazyDebugger(val *LazyValues) *LazyDebugger {
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lz := &LazyDebugger{val: val}
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lz.hasChanged.Store(false)
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return lz
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}
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func (lz *LazyDebugger) push() {
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lz.quantum.Store(lz.val.dbg.GetQuantum())
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lz.liveDisasmEntry.Store(lz.val.dbg.GetLiveDisasmEntry())
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lz.breakpoints.Store(lz.val.dbg.QueryBreakpoints())
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// because the push() and update() pair don't interlock exactly, the
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// hasChanged field must be latched. unlatching is performed in the
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// update() function
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if !lz.hasChanged.Load().(bool) {
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lz.hasChanged.Store(lz.val.dbg.HasChanged())
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}
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lz.state.Store(lz.val.dbg.State())
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}
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func (lz *LazyDebugger) update() {
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lz.Quantum, _ = lz.quantum.Load().(debugger.Quantum)
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if lz.liveDisasmEntry.Load() != nil {
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lz.LiveDisasmEntry = lz.liveDisasmEntry.Load().(disassembly.Entry)
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}
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lz.Breakpoints, _ = lz.breakpoints.Load().(debugger.BreakpointsQuery)
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// load current hasChanged value and unlatch (see push() function)
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lz.HasChanged = lz.hasChanged.Load().(bool)
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lz.hasChanged.Store(false)
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lz.State, _ = lz.state.Load().(govern.State)
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}
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