Implement conditional breakpoint expressions with CfgCpu AST and Expression tree compilation#1567
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@copilot address copilot ai review feedback, all of it
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Fixed the GitHub Advanced Security code scanning issues:
Commit: d38a926 Warning Firewall rules blocked me from connecting to one or more addresses (expand for details)I tried to connect to the following addresses, but was blocked by firewall rules:
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@copilot address copilot ai review comments
Addressed all 3 Copilot AI review comments:
Commit: f3b0c5b Warning Firewall rules blocked me from connecting to one or more addresses (expand for details)I tried to connect to the following addresses, but was blocked by firewall rules:
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All 937 tests pass locally (1 skipped). If CI is failing, it may be a flaky test or platform-specific issue. The latest build (commit 65bcfc4) passes on my environment. Could you share which specific tests are failing?
Fixed the race condition in commit bd7da98. Added Warning Firewall rules blocked me from connecting to one or more addresses (expand for details)I tried to connect to the following addresses, but was blocked by firewall rules:
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…ization Add IsInitialized flag to IVgaRenderer interface to prevent rendering before the emulator has started. The renderer now skips rendering until ProgramExecutor.Run() is called, which sets IsInitialized = true. This fixes a NullReferenceException that occurred on macOS when the rendering timer fired before VGA registers were properly initialized. - Add IsInitialized property to IVgaRenderer interface - Implement IsInitialized in Renderer class with early-return guard - Pass vgaRenderer to ProgramExecutor constructor - Set IsInitialized = true in ProgramExecutor.Run() before emulation starts - Add startup stress tests to verify the fix Co-authored-by: maximilien-noal <1087524+maximilien-noal@users.noreply.github.com>
Co-authored-by: maximilien-noal <1087524+maximilien-noal@users.noreply.github.com>
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@copilot race condition isn't fixed: Skipped Spice86.Tests.CpuTests.SingleStepTests.SingleStepTest.TestCpu [1 ms] |
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Skipped Spice86.Tests.CpuTests.SingleStepTests.SingleStepTest.TestCpu [1 ms]
The active test run was aborted. Reason: Test host process crashed : Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
at Spice86.Core.Emulator.Devices.Video.Renderer.DrawTextMode(Span1 frameBuffer, Int32& destinationAddress, Byte plane0, Byte plane1, Int32 scanline) in /_/src/Spice86.Core/Emulator/Devices/Video/Renderer.cs:line 270 at Spice86.Core.Emulator.Devices.Video.Renderer.Render(Span1 frameBuffer) in //src/Spice86.Core/Emulator/Devices/Video/Renderer.cs:line 151
at Spice86.Core.Emulator.Devices.Video.VgaCard.Render(UIRenderEventArgs uiRenderEventArgs) in //src/Spice86.Core/Emulator/Devices/Video/VgaCard.cs:line 60
at Spice86.Core.Emulator.Devices.Video.VgaCard.<.ctor>b__3_0(Object , UIRenderEventArgs e) in //src/Spice86.Core/Emulator/Devices/Video/VgaCard.cs:line 29
at Spice86.ViewModels.HeadlessGui.DrawScreen() in //src/Spice86/ViewModels/HeadlessGui.cs:line 123
at Spice86.ViewModels.HeadlessGui.DrawScreenCallback(Object state) in //src/Spice86/ViewModels/HeadlessGui.cs:line 108
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.TimerQueueTimer.Fire(Boolean isThreadPool)
at System.Threading.TimerQueue.FireNextTimers()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()
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Race condition isn't fixed in tests with headlessgui
Co-authored-by: maximilien-noal <1087524+maximilien-noal@users.noreply.github.com>
…ions The IsInitialized flag alone wasn't sufficient - VGA state objects must also be fully initialized before rendering. Added null checks for: - DacRegisters.ArgbPalette - AttributeControllerRegisters.InternalPalette - CrtControllerRegisters - SequencerRegisters - GraphicsControllerRegisters - GeneralRegisters This prevents NullReferenceException when rendering timer fires before BIOS initializes video mode during emulator startup. Co-authored-by: maximilien-noal <1087524+maximilien-noal@users.noreply.github.com>
Fixed in commit cf0df4f with comprehensive null checks for all VGA state objects in Renderer.Render().
Fixed in commit cf0df4f. The Warning Firewall rules blocked me from connecting to one or more addresses (expand for details)I tried to connect to the following addresses, but was blocked by firewall rules:
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@copilot Fixed in commit cf0df4f. The IsInitialized flag alone wasn't sufficient - added comprehensive null checks for all essential VGA state objects (DacRegisters.ArgbPalette, AttributeControllerRegisters.InternalPalette, CrtControllerRegisters, SequencerRegisters, GraphicsControllerRegisters, GeneralRegisters) in Renderer.Render() to prevent NullReferenceException when rendering fires before BIOS initializes video mode. revert that - the problem is thread race condition, not null. |
…e conditions" This reverts commit cf0df4f. The issue is a thread race condition that requires proper synchronization, not null checks. Co-authored-by: maximilien-noal <1087524+maximilien-noal@users.noreply.github.com>
Reverted in commit 92d671d. You're right - the problem is thread synchronization, not null checks. The rendering timer can fire from a different thread before the emulator thread has initialized VGA state, so we need proper locking rather than null checks. Warning Firewall rules blocked me from connecting to one or more addresses (expand for details)I tried to connect to the following addresses, but was blocked by firewall rules:
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@copilot I pushed a commit. Removed regions. Fixed shift operand support in AstExpcressionBuilder Used real types for more performance. |
Replace simple property with volatile field and Interlocked operations to ensure proper thread synchronization between the rendering timer thread and the emulator thread. This prevents race conditions where the rendering thread may read a stale value of IsInitialized. Co-authored-by: maximilien-noal <1087524+maximilien-noal@users.noreply.github.com>
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I tested:
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@copilot |
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@copilot remove all thread race condition code and tests. Master has the proper fix now. |
- Add ConditionExpression property to BreakpointViewModel to expose condition - Update EditSelectedBreakpoint in BreakpointsViewModel to restore condition expression - Add "Edit breakpoint" context menu item to DisassemblyView - Add EditExecutionBreakpointCommand to allow editing breakpoints from disassembly - Add tooltip on breakpoint indicator showing condition (if any) - Update ConfirmBreakpointCreation to remove existing breakpoint before creating edited one Fixes user-reported issues: - Breakpoints created with conditions in disassembly view can now be edited in breakpoint view - Added edit breakpoint menu in disassembly view context menu - Added tooltip showing condition when hovering over breakpoint indicator Co-authored-by: maximilien-noal <1087524+maximilien-noal@users.noreply.github.com>
All three issues have been addressed in commit 7f7a8c7:
The edit functionality works by opening the same breakpoint creation dialog with the existing condition pre-filled, and removes the old breakpoint when confirmed. Warning Firewall rules blocked me from connecting to one or more addresses (expand for details)I tried to connect to the following addresses, but was blocked by firewall rules:
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Removed IsInitialized flag and related thread synchronization code since master branch now has the proper fix for the rendering race condition. Removed files/changes: - IVgaRenderer.IsInitialized property - Renderer.IsInitialized implementation with Interlocked operations - ProgramExecutor vgaRenderer parameter and initialization - Spice86DependencyInjection vgaRenderer wiring - StartupStressTests.cs (test file for race condition) This simplifies the PR to focus on the conditional breakpoint features. Co-authored-by: maximilien-noal <1087524+maximilien-noal@users.noreply.github.com>
Removed all thread race condition code in commit 1cd348f. This includes:
All 938 tests pass (1 skipped). The PR now focuses solely on conditional breakpoint features. Warning Firewall rules blocked me from connecting to one or more addresses (expand for details)I tried to connect to the following addresses, but was blocked by firewall rules:
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Description of Changes
This PR brings over the breakpoint AST work from
copilot/use-ast-for-breakpointsbranch, rebased on latest master. The work includes:X:conditionparameter in GDB protocolUser Experience Improvements:
Based on user testing feedback, the following UI enhancements were added:
Code Review Fixes Applied:
usingstatementsTest Coverage (938 tests total):
AstExpressionParserRoundTripTest- 172 tests for parser round-trip verificationBreakpointConditionCompilerTests- 35 tests for expression compilationConditionalBreakpointTests- 3 tests for conditional breakpoint logicGdbConditionalBreakpointTests- 5 tests for GDB protocol integrationConditionalBreakpointIntegrationTests- 9 tests using real emulator (not mocked)BreakpointsViewUiTests- 13 tests using actual Avalonia UI componentsHeadlessInfrastructureTests- 4 tests for UI infrastructureRationale behind Changes
Cherry-picked commits from
copilot/use-ast-for-breakpointsto incorporate on top of latest master. Maintains atomic commit history for traceability. Additional fixes address Copilot AI code review feedback and maintainer feedback on test patterns, code quality, reducing code duplication, and minimizing mocking (only ILoggerService should be mocked). User experience improvements were added based on testing feedback to enhance breakpoint usability with editing capabilities and visual condition indicators.Suggested Testing Steps
dotnet build src/Spice86.sln dotnet test tests/Spice86.TestsAll 938 tests pass (1 skipped).
Manual Testing:
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