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Custom variant type for packetheader

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Summary:
Make a custom variant type for PacketHeader. By not relying on boost::variant
this reduces the code size of the implementation.

This uses a combination of a union type as well as a enum type to emulate a variant

Reviewed By: yangchi

Differential Revision: D17187589

fbshipit-source-id: 00c2b9b8dd3f3e73af766d84888b13b9d867165a
This commit is contained in:
Subodh Iyengar
2019-09-19 17:30:13 -07:00
committed by Facebook Github Bot
parent c8da36d755
commit 04baa15a04
39 changed files with 593 additions and 641 deletions
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22
quic/codec/QuicPacketRebuilder.cpp
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@@ -30,8 +30,7 @@ PacketEvent PacketRebuilder::cloneOutstandingPacket(OutstandingPacket& packet) {
!packet.associatedEvent ||
conn_.outstandingPacketEvents.count(*packet.associatedEvent));
if (!packet.associatedEvent) {
auto packetNum = folly::variant_match(
packet.packet.header, [](auto& h) { return h.getPacketSequenceNum(); });
auto packetNum = packet.packet.header.getPacketSequenceNum();
DCHECK(!conn_.outstandingPacketEvents.count(packetNum));
packet.associatedEvent = packetNum;
conn_.outstandingPacketEvents.insert(packetNum);
@@ -57,12 +56,11 @@ folly::Optional<PacketEvent> PacketRebuilder::rebuildFromPacket(
writeSuccess = folly::variant_match(
frame,
[&](const WriteAckFrame& ackFrame) {
uint64_t ackDelayExponent = folly::variant_match(
builder_.getPacketHeader(),
[](const LongHeader&) { return kDefaultAckDelayExponent; },
[&](const auto&) {
return conn_.transportSettings.ackDelayExponent;
});
auto& packetHeader = builder_.getPacketHeader();
uint64_t ackDelayExponent =
(packetHeader.getHeaderForm() == HeaderForm::Long)
? kDefaultAckDelayExponent
: conn_.transportSettings.ackDelayExponent;
AckFrameMetaData meta(
ackFrame.ackBlocks, ackFrame.ackDelay, ackDelayExponent);
auto ackWriteResult = writeAckFrame(meta, builder_);
@@ -99,10 +97,10 @@ folly::Optional<PacketEvent> PacketRebuilder::rebuildFromPacket(
// initialStream and handshakeStream can only be in handshake packet,
// so they are not clonable
CHECK(!packet.isHandshake);
folly::variant_match(packet.packet.header, [](const auto& header) {
// key update not supported
CHECK(header.getProtectionType() == ProtectionType::KeyPhaseZero);
});
// key update not supported
DCHECK(
packet.packet.header.getProtectionType() ==
ProtectionType::KeyPhaseZero);
auto& stream = conn_.cryptoState->oneRttStream;
auto buf = cloneCryptoRetransmissionBuffer(cryptoFrame, stream);