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[Fix] (Pipe): re-arm the verify comparator when any of its three knobs changes, not only when PipeVerify does

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- ArmVerify latched PipeVerifyFatal and PipeVerifyCorrupt at the moment PipeVerify changed; a later change to either without a PipeVerify toggle was not seen, so 878db2c4's "re-parse when their value changes" held for one knob of three.
- The latch now keys on all three Features values. A lane loads Features before its first fill, so it still arms once per process; cost is two Bool compares and one String compare per fill, verify builds only.
This commit is contained in:
swung0x48
2026-09-06 02:55:17 -04:00
parent 30d72c5b4e
commit d0ff647581
1 changed files with 15 additions and 7 deletions
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MobileGL/MG_Impl/Pipe/PipeFill.cpp
+15 -7
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@@ -351,6 +351,7 @@ namespace MobileGL::MG_Pipe {
Bool Fatal = true;
Bool InHook = false; // a re-read that re-enters an accessor is not re-verified
Optional<MGPipeInputField> Corrupt;
String CorruptKnob; // the MOBILEGL_PIPE_VERIFY_CORRUPT value the last arm saw
std::atomic<Uint64> Divergences{0};
~VerifyState() {
const Uint64 count = Divergences.load(std::memory_order_relaxed);
@@ -362,17 +363,24 @@ namespace MobileGL::MG_Pipe {
};
VerifyState g_verify;
// Armed on the first fill and re-armed only when Features.PipeVerify changes (the
// same reason as ParsePoisonOmissionKnob: one arm per lane process, a fresh arm for a
// forked test child that turns the knob on after its parent filled unarmed).
// Armed on the first fill and re-armed when any of the three verify knobs'
// Features value (PipeVerify, PipeVerifyFatal, PipeVerifyCorrupt) differs from what
// the last arm latched (the same reason as ParsePoisonOmissionKnob: one arm per lane
// process, a fresh arm for a forked test child that turns a knob after its parent
// filled). Cost: two Bool compares and one String compare per fill, verify builds only.
void ArmVerify() {
if (g_verify.Parsed && g_verify.Enabled == MG_Config::Features.PipeVerify) return;
const auto& features = MG_Config::Features;
if (g_verify.Parsed && g_verify.Enabled == features.PipeVerify && g_verify.Fatal == features.PipeVerifyFatal &&
g_verify.CorruptKnob == features.PipeVerifyCorrupt) {
return;
}
g_verify.Parsed = true;
g_verify.Enabled = MG_Config::Features.PipeVerify;
g_verify.Enabled = features.PipeVerify;
g_verify.Fatal = features.PipeVerifyFatal;
g_verify.CorruptKnob = features.PipeVerifyCorrupt;
g_verify.Corrupt = Optional<MGPipeInputField>{};
if (!g_verify.Enabled) return;
g_verify.Fatal = MG_Config::Features.PipeVerifyFatal;
const String& corrupt = MG_Config::Features.PipeVerifyCorrupt;
const String& corrupt = g_verify.CorruptKnob;
if (!corrupt.empty()) {
const auto field = MGPipeFindInputField(corrupt.c_str());
if (!field) {