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TitanEngine
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Defer deleted breakpoints until step finishes

This commit is contained in:
Duncan Ogilvie 2026-07-18 12:18:18 +02:00
parent 810ab65f10
commit ccac889f27
1 changed files with 14 additions and 4 deletions
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18
TitanEngine/TitanEngine.Debugger.DebugLoop.cpp
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@ -8,6 +8,7 @@
#include "Global.Librarian.h"
#include "Global.TLS.h"
#include <unordered_map>
#include <unordered_set>
#include <functional>
#define UE_MODULEx86 0x2000;
@ -83,6 +84,7 @@ __declspec(dllexport) void TITCALL DebugLoop()
DWORD ThreadBeingProcessed = 0;
std::unordered_map<DWORD, THREAD_ITEM_DATA> SuspendedThreads;
std::unordered_set<uint64_t> DeferredExceptionThreads;
bool IsDbgReplyLaterSupported = false;
// Check if DBG_REPLY_LATER is supported based on Windows version (Windows 10, version 1507 or above)
@ -131,10 +133,12 @@ __declspec(dllexport) void TITCALL DebugLoop()
}
else
{
// Regular timeout, wait again
// After 2 consecutive timeouts, clear recently deleted breakpoints
// Do not expire deleted breakpoints while a breakpoint step-over is
// still in flight. The stepped instruction can block indefinitely and
// breakpoint events from the suspended threads remain pending until its
// single-step event arrives.
consecutiveTimeouts++;
if(consecutiveTimeouts >= 2)
if(consecutiveTimeouts >= 2 && ThreadBeingProcessed == 0 && SuspendedThreads.empty() && DeferredExceptionThreads.empty())
recentlyDeletedBpx.clear();
continue;
}
@ -142,6 +146,8 @@ __declspec(dllexport) void TITCALL DebugLoop()
// Event received, reset timeout counter
consecutiveTimeouts = 0;
const uint64_t eventThreadKey = (uint64_t(DBGEvent.dwProcessId) << 32) | DBGEvent.dwThreadId;
const bool completingDeferredException = DeferredExceptionThreads.count(eventThreadKey) != 0;
if(IsDbgReplyLaterSupported)
{
@ -150,7 +156,9 @@ __declspec(dllexport) void TITCALL DebugLoop()
// Check if there is a thread processing a single step
if(ThreadBeingProcessed != 0 && DBGEvent.dwThreadId != ThreadBeingProcessed)
{
// Reply to the dbg event later
// Reply to the event later and retain its ownership state until
// the same thread's event is processed normally.
DeferredExceptionThreads.insert(eventThreadKey);
DBGCode = DBG_REPLY_LATER;
goto continue_dbg_event;
@ -1445,6 +1453,8 @@ continue_dbg_event:
{
break;
}
if(DBGCode != DBG_REPLY_LATER && completingDeferredException)
DeferredExceptionThreads.erase(eventThreadKey);
if(engineProcessIsNowDetached)
{
DebugActiveProcessStop(dbgProcessInformation.dwProcessId);