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feat: value history heatmap, write-fail guard, crash handler hardening

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- Value history ring buffer (10 slots) tracks per-node change frequency
- Three-level heatmap: cold (blue), warm (amber), hot (red) via theme
- Heat persists indefinitely (no fade) — shows analysis history
- Calltip on hover shows previous values list
- Old themes auto-derive heat colors from existing palette
- Write failures no longer apply optimistic visual updates
- Crash handler: re-entrancy guard, context dump before risky APIs
This commit is contained in:
IChooseYou
2026-02-16 16:44:46 -07:00
parent e064646c02
commit 5ae9ca0979
12 changed files with 363 additions and 41 deletions
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47
src/main.cpp
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@@ -67,29 +67,56 @@ static void setDarkTitleBar(QWidget* widget) {
}
}
// Guard flag to prevent re-entrant crash inside the handler
static volatile LONG s_inCrashHandler = 0;
static LONG WINAPI crashHandler(EXCEPTION_POINTERS* ep) {
// Prevent re-entrant crash: if we fault inside the handler, skip the
// risky dbghelp work and just terminate with what we already printed.
if (InterlockedCompareExchange(&s_inCrashHandler, 1, 0) != 0) {
fprintf(stderr, "\n(re-entrant fault inside crash handler — aborting)\n");
fflush(stderr);
return EXCEPTION_EXECUTE_HANDLER;
}
// Phase 1: always-safe output (no allocations, no complex APIs)
fprintf(stderr, "\n=== UNHANDLED EXCEPTION ===\n");
fprintf(stderr, "Code : 0x%08lX\n", ep->ExceptionRecord->ExceptionCode);
fprintf(stderr, "Addr : %p\n", ep->ExceptionRecord->ExceptionAddress);
#ifdef _M_X64
fprintf(stderr, "RIP : 0x%016llx\n", (unsigned long long)ep->ContextRecord->Rip);
fprintf(stderr, "RSP : 0x%016llx\n", (unsigned long long)ep->ContextRecord->Rsp);
#else
fprintf(stderr, "EIP : 0x%08lx\n", (unsigned long)ep->ContextRecord->Eip);
#endif
fflush(stderr);
// Phase 2: attempt symbol resolution + stack walk
// Copy context so StackWalk64 can mutate it safely
CONTEXT ctxCopy = *ep->ContextRecord;
HANDLE process = GetCurrentProcess();
HANDLE thread = GetCurrentThread();
SymSetOptions(SYMOPT_LOAD_LINES | SYMOPT_UNDNAME);
SymInitialize(process, NULL, TRUE);
SymSetOptions(SYMOPT_LOAD_LINES | SYMOPT_UNDNAME | SYMOPT_FAIL_CRITICAL_ERRORS);
if (!SymInitialize(process, NULL, TRUE)) {
fprintf(stderr, "\n(SymInitialize failed — no stack trace available)\n");
fprintf(stderr, "=== END CRASH ===\n");
fflush(stderr);
return EXCEPTION_EXECUTE_HANDLER;
}
CONTEXT* ctx = ep->ContextRecord;
STACKFRAME64 frame = {};
DWORD machineType;
#ifdef _M_X64
machineType = IMAGE_FILE_MACHINE_AMD64;
frame.AddrPC.Offset = ctx->Rip;
frame.AddrFrame.Offset = ctx->Rbp;
frame.AddrStack.Offset = ctx->Rsp;
frame.AddrPC.Offset = ctxCopy.Rip;
frame.AddrFrame.Offset = ctxCopy.Rbp;
frame.AddrStack.Offset = ctxCopy.Rsp;
#else
machineType = IMAGE_FILE_MACHINE_I386;
frame.AddrPC.Offset = ctx->Eip;
frame.AddrFrame.Offset = ctx->Ebp;
frame.AddrStack.Offset = ctx->Esp;
frame.AddrPC.Offset = ctxCopy.Eip;
frame.AddrFrame.Offset = ctxCopy.Ebp;
frame.AddrStack.Offset = ctxCopy.Esp;
#endif
frame.AddrPC.Mode = AddrModeFlat;
frame.AddrFrame.Mode = AddrModeFlat;
@@ -97,7 +124,7 @@ static LONG WINAPI crashHandler(EXCEPTION_POINTERS* ep) {
fprintf(stderr, "\nStack trace:\n");
for (int i = 0; i < 64; i++) {
if (!StackWalk64(machineType, process, thread, &frame, ctx,
if (!StackWalk64(machineType, process, thread, &frame, &ctxCopy,
NULL, SymFunctionTableAccess64,
SymGetModuleBase64, NULL))
break;