Bug 1766377 - Fix some sign-compare warnings by using ProcessId more consistently. r=nika,necko-reviewers,kershaw

dom/media/ipc/RDDProcessManager.cpp(320,21): error: comparison of integers of different signs: 'base::ProcessId' (aka 'unsigned long') and 'int' [-Werror,-Wsign-compare]
      gpuProcessPid != -1 ? gpuProcessPid : base::GetCurrentProcId();
      ~~~~~~~~~~~~~ ^  ~~
dom/media/ipc/RDDProcessManager.cpp(332,21): error: comparison of integers of different signs: 'base::ProcessId' (aka 'unsigned long') and 'int' [-Werror,-Wsign-compare]
  if (gpuProcessPid != -1) {
      ~~~~~~~~~~~~~ ^  ~~
gfx/layers/ipc/SharedSurfacesParent.cpp(360,38): error: comparison of integers of different signs: 'base::ProcessId' (aka 'unsigned long') and 'int' [-Werror,-Wsign-compare]
    if (!gpm || gpm->GPUProcessPid() != -1) {
                ~~~~~~~~~~~~~~~~~~~~ ^  ~~
ipc/glue/MessageChannel.cpp(2145,13): error: comparison of integers of different signs: 'int32_t' (aka 'int') and 'const base::ProcessId' (aka 'const unsigned long') [-Werror,-Wsign-compare]
    if (pid != base::kInvalidProcessId &&
        ~~~ ^  ~~~~~~~~~~~~~~~~~~~~~~~

Differential Revision: https://phabricator.services.mozilla.com/D144688

docshell/base/SyncedContextInlines.h

@@ -278,7 +278,7 @@ typename Transaction<Context>::IndexSet Transaction<Context>::Validate(
     // from this transaction, so we log the failed values we're going to revert.
     MOZ_LOG(Context::GetSyncLog(), LogLevel::Debug,
             ("Transaction::PartialRevert(#%" PRIx64 ", pid %d): %s",
-             aOwner->Id(), aSource ? aSource->OtherPid() : -1,
+             aOwner->Id(), aSource ? aSource->OtherPid() : base::kInvalidProcessId,
              FormatTransaction<Context>(revertTxn.mModified, mValues,
                                         revertTxn.mValues)
                  .get()));

dom/media/ipc/RDDProcessHost.cpp

@@ -127,7 +127,7 @@ RefPtr<GenericNonExclusivePromise> RDDProcessHost::LaunchPromise() {
   return mLaunchPromise;
 }
 
-void RDDProcessHost::OnChannelConnected(int32_t peer_pid) {
+void RDDProcessHost::OnChannelConnected(base::ProcessId peer_pid) {
   MOZ_ASSERT(!NS_IsMainThread());
 
   GeckoChildProcessHost::OnChannelConnected(peer_pid);

dom/media/ipc/RDDProcessHost.h

@@ -88,7 +88,7 @@ class RDDProcessHost final : public mozilla::ipc::GeckoChildProcessHost {
   TimeStamp GetLaunchTime() const { return mLaunchTime; }
 
   // Called on the IO thread.
-  void OnChannelConnected(int32_t peer_pid) override;
+  void OnChannelConnected(base::ProcessId peer_pid) override;
   void OnChannelError() override;
 
   void SetListener(Listener* aListener);

dom/media/ipc/RDDProcessManager.cpp

@@ -306,7 +306,8 @@ bool RDDProcessManager::CreateVideoBridge() {
   ipc::Endpoint<PVideoBridgeChild> childPipe;
 
   GPUProcessManager* gpuManager = GPUProcessManager::Get();
-  base::ProcessId gpuProcessPid = gpuManager ? gpuManager->GPUProcessPid() : -1;
+  base::ProcessId gpuProcessPid =
+      gpuManager ? gpuManager->GPUProcessPid() : base::kInvalidProcessId;
 
   // Build content device data first; this ensure that the GPU process is fully
   // ready.
@@ -316,8 +317,9 @@ bool RDDProcessManager::CreateVideoBridge() {
   // The child end is the producer of video frames; the parent end is the
   // consumer.
   base::ProcessId childPid = RDDProcessPid();
-  base::ProcessId parentPid =
-      gpuProcessPid != -1 ? gpuProcessPid : base::GetCurrentProcId();
+  base::ProcessId parentPid = gpuProcessPid != base::kInvalidProcessId
+                                  ? gpuProcessPid
+                                  : base::GetCurrentProcId();
 
   nsresult rv = PVideoBridge::CreateEndpoints(parentPid, childPid, &parentPipe,
                                               &childPipe);
@@ -329,7 +331,7 @@ bool RDDProcessManager::CreateVideoBridge() {
 
   mRDDChild->SendInitVideoBridge(std::move(childPipe),
                                  mNumUnexpectedCrashes == 0, contentDeviceData);
-  if (gpuProcessPid != -1) {
+  if (gpuProcessPid != base::kInvalidProcessId) {
     gpuManager->InitVideoBridge(std::move(parentPipe));
   } else {
     VideoBridgeParent::Open(std::move(parentPipe),
@@ -341,7 +343,8 @@ bool RDDProcessManager::CreateVideoBridge() {
 
 base::ProcessId RDDProcessManager::RDDProcessPid() {
   MOZ_ASSERT(NS_IsMainThread());
-  base::ProcessId rddPid = mRDDChild ? mRDDChild->OtherPid() : -1;
+  base::ProcessId rddPid =
+      mRDDChild ? mRDDChild->OtherPid() : base::kInvalidProcessId;
   return rddPid;
 }
 

gfx/ipc/GPUProcessHost.cpp

@@ -88,7 +88,7 @@ bool GPUProcessHost::WaitForLaunch() {
   return result;
 }
 
-void GPUProcessHost::OnChannelConnected(int32_t peer_pid) {
+void GPUProcessHost::OnChannelConnected(base::ProcessId peer_pid) {
   MOZ_ASSERT(!NS_IsMainThread());
 
   GeckoChildProcessHost::OnChannelConnected(peer_pid);

gfx/ipc/GPUProcessHost.h

@@ -100,7 +100,7 @@ class GPUProcessHost final : public mozilla::ipc::GeckoChildProcessHost {
   TimeStamp GetLaunchTime() const { return mLaunchTime; }
 
   // Called on the IO thread.
-  void OnChannelConnected(int32_t peer_pid) override;
+  void OnChannelConnected(base::ProcessId peer_pid) override;
   void OnChannelError() override;
 
   void SetListener(Listener* aListener);

gfx/ipc/GPUProcessManager.cpp

@@ -1098,7 +1098,8 @@ bool GPUProcessManager::CreateContentImageBridge(
 }
 
 base::ProcessId GPUProcessManager::GPUProcessPid() {
-  base::ProcessId gpuPid = mGPUChild ? mGPUChild->OtherPid() : -1;
+  base::ProcessId gpuPid =
+      mGPUChild ? mGPUChild->OtherPid() : base::kInvalidProcessId;
   return gpuPid;
 }
 

gfx/layers/ipc/SharedSurfacesParent.cpp

@@ -357,7 +357,7 @@ bool SharedSurfacesParent::AccumulateMemoryReport(
     SharedSurfacesMemoryReport& aReport) {
   if (XRE_IsParentProcess()) {
     GPUProcessManager* gpm = GPUProcessManager::Get();
-    if (!gpm || gpm->GPUProcessPid() != -1) {
+    if (!gpm || gpm->GPUProcessPid() != base::kInvalidProcessId) {
       return false;
     }
   } else if (!XRE_IsGPUProcess()) {

gfx/vr/ipc/VRProcessParent.cpp

@@ -198,7 +198,7 @@ void VRProcessParent::OnChannelError() {
   MOZ_ASSERT(false, "VR process channel error.");
 }
 
-void VRProcessParent::OnChannelConnected(int32_t peer_pid) {
+void VRProcessParent::OnChannelConnected(base::ProcessId peer_pid) {
   MOZ_ASSERT(!NS_IsMainThread());
 
   GeckoChildProcessHost::OnChannelConnected(peer_pid);

gfx/vr/ipc/VRProcessParent.h

@@ -49,7 +49,7 @@ class VRProcessParent final : public mozilla::ipc::GeckoChildProcessHost {
   bool CanShutdown() override { return true; }
 
   void OnChannelError() override;
-  void OnChannelConnected(int32_t peer_pid) override;
+  void OnChannelConnected(base::ProcessId peer_pid) override;
   void OnChannelConnectedTask();
   void OnChannelErrorTask();
   void OnChannelClosed();

ipc/chromium/src/chrome/common/child_process_host.cc

@@ -47,7 +47,8 @@ void ChildProcessHost::ListenerHook::OnMessageReceived(IPC::Message&& msg) {
   host_->OnMessageReceived(std::move(msg));
 }
 
-void ChildProcessHost::ListenerHook::OnChannelConnected(int32_t peer_pid) {
+void ChildProcessHost::ListenerHook::OnChannelConnected(
+    base::ProcessId peer_pid) {
   host_->opening_channel_ = false;
   host_->OnChannelConnected(peer_pid);
 }

ipc/chromium/src/chrome/common/child_process_host.h

@@ -40,7 +40,7 @@ class ChildProcessHost : public IPC::Channel::Listener {
 
   // IPC::Channel::Listener implementation:
   virtual void OnMessageReceived(IPC::Message&& msg) override {}
-  virtual void OnChannelConnected(int32_t peer_pid) override {}
+  virtual void OnChannelConnected(base::ProcessId peer_pid) override {}
   virtual void OnChannelError() override {}
 
   bool opening_channel() { return opening_channel_; }
@@ -57,7 +57,7 @@ class ChildProcessHost : public IPC::Channel::Listener {
    public:
     explicit ListenerHook(ChildProcessHost* host);
     virtual void OnMessageReceived(IPC::Message&& msg) override;
-    virtual void OnChannelConnected(int32_t peer_pid) override;
+    virtual void OnChannelConnected(base::ProcessId peer_pid) override;
     virtual void OnChannelError() override;
     virtual void GetQueuedMessages(std::queue<IPC::Message>& queue) override;
 

ipc/chromium/src/chrome/common/ipc_channel.h

@@ -10,6 +10,7 @@
 #include <cstdint>
 #include <queue>
 #include "base/basictypes.h"
+#include "base/process.h"
 #include "build/build_config.h"
 #include "mozilla/UniquePtr.h"
 #include "mozilla/UniquePtrExtensions.h"
@@ -60,7 +61,7 @@ class Channel {
 
     // Called when the channel is connected and we have received the internal
     // Hello message from the peer.
-    virtual void OnChannelConnected(int32_t peer_pid) {}
+    virtual void OnChannelConnected(base::ProcessId peer_pid) {}
 
     // Called when an error is detected that causes the channel to close.
     // This method is not called when a channel is closed normally.

ipc/chromium/src/chrome/common/ipc_channel_utils.cc

@@ -16,7 +16,7 @@ void AddIPCProfilerMarker(const Message& aMessage, int32_t aOtherPid,
                           mozilla::ipc::MessagePhase aPhase) {
   if (aMessage.routing_id() != MSG_ROUTING_NONE &&
       profiler_feature_active(ProfilerFeature::IPCMessages)) {
-    if (aOtherPid == -1) {
+    if (aOtherPid == base::kInvalidProcessId) {
       DLOG(WARNING) << "Unable to record IPC profile marker, other PID not set";
       return;
     }

ipc/glue/GeckoChildProcessHost.cpp

@@ -1575,7 +1575,7 @@ bool GeckoChildProcessHost::OpenPrivilegedHandle(base::ProcessId aPid) {
   return base::OpenPrivilegedProcessHandle(aPid, &mChildProcessHandle);
 }
 
-void GeckoChildProcessHost::OnChannelConnected(int32_t peer_pid) {
+void GeckoChildProcessHost::OnChannelConnected(base::ProcessId peer_pid) {
   if (!OpenPrivilegedHandle(peer_pid)) {
     MOZ_CRASH("can't open handle to child process");
   }

ipc/glue/GeckoChildProcessHost.h

@@ -109,7 +109,7 @@ class GeckoChildProcessHost : public ChildProcessHost,
   bool SyncLaunch(StringVector aExtraOpts = StringVector(),
                   int32_t timeoutMs = 0);
 
-  virtual void OnChannelConnected(int32_t peer_pid) override;
+  virtual void OnChannelConnected(base::ProcessId peer_pid) override;
   virtual void OnMessageReceived(IPC::Message&& aMsg) override;
   virtual void OnChannelError() override;
   virtual void GetQueuedMessages(std::queue<IPC::Message>& queue) override;

ipc/glue/MessageChannel.cpp

@@ -2137,7 +2137,7 @@ void MessageChannel::AddProfilerMarker(const IPC::Message& aMessage,
   mMonitor->AssertCurrentThreadOwns();
 
   if (profiler_feature_active(ProfilerFeature::IPCMessages)) {
-    int32_t pid = mListener->OtherPidMaybeInvalid();
+    base::ProcessId pid = mListener->OtherPidMaybeInvalid();
     // Only record markers for IPCs with a valid pid.
     // And if one of the profiler mutexes is locked on this thread, don't record
     // markers, because we don't want to expose profiler IPCs due to the

ipc/glue/NodeChannel.cpp

@@ -37,7 +37,7 @@ namespace mozilla::ipc {
 
 NodeChannel::NodeChannel(const NodeName& aName,
                          UniquePtr<IPC::Channel> aChannel, Listener* aListener,
-                         int32_t aPid)
+                         base::ProcessId aPid)
     : mListener(aListener),
       mName(aName),
       mOtherPid(aPid),
@@ -97,8 +97,8 @@ void NodeChannel::Start(bool aCallConnect) {
     }
   } else {
     // Check if our channel has already been connected, and knows the other PID.
-    int32_t otherPid = mChannel->OtherPid();
-    if (otherPid != -1) {
+    base::ProcessId otherPid = mChannel->OtherPid();
+    if (otherPid != base::kInvalidProcessId) {
       SetOtherPid(otherPid);
     }
 
@@ -121,11 +121,11 @@ void NodeChannel::Close() {
   mClosed = true;
 }
 
-void NodeChannel::SetOtherPid(int32_t aNewPid) {
+void NodeChannel::SetOtherPid(base::ProcessId aNewPid) {
   AssertIOThread();
-  MOZ_ASSERT(aNewPid != -1);
+  MOZ_ASSERT(aNewPid != base::kInvalidProcessId);
 
-  int32_t previousPid = -1;
+  base::ProcessId previousPid = base::kInvalidProcessId;
   if (!mOtherPid.compare_exchange_strong(previousPid, aNewPid)) {
     // The PID was already set before this call, double-check that it's correct.
     MOZ_RELEASE_ASSERT(previousPid == aNewPid,
@@ -282,7 +282,7 @@ void NodeChannel::OnMessageReceived(IPC::Message&& aMessage) {
   OnChannelError();
 }
 
-void NodeChannel::OnChannelConnected(int32_t aPeerPid) {
+void NodeChannel::OnChannelConnected(base::ProcessId aPeerPid) {
   AssertIOThread();
 
   SetOtherPid(aPeerPid);

ipc/glue/NodeChannel.h

@@ -9,6 +9,7 @@
 
 #include "mojo/core/ports/node.h"
 #include "mojo/core/ports/node_delegate.h"
+#include "base/process.h"
 #include "chrome/common/ipc_message.h"
 #include "chrome/common/ipc_channel.h"
 #include "mozilla/ipc/ProtocolUtils.h"
@@ -37,8 +38,8 @@ class NodeChannel final : public IPC::Channel::Listener {
     NodeName mName;
     IPC::Channel::ChannelHandle mHandle;
     IPC::Channel::Mode mMode;
-    int32_t mMyPid = -1;
-    int32_t mOtherPid = -1;
+    base::ProcessId mMyPid = base::kInvalidProcessId;
+    base::ProcessId mOtherPid = base::kInvalidProcessId;
   };
 
   class Listener {
@@ -62,7 +63,7 @@ class NodeChannel final : public IPC::Channel::Listener {
   };
 
   NodeChannel(const NodeName& aName, UniquePtr<IPC::Channel> aChannel,
-              Listener* aListener, int32_t aPid = -1);
+              Listener* aListener, base::ProcessId aPid = base::kInvalidProcessId);
 
   // Send the given message over this peer channel link. May be called from any
   // thread.
@@ -82,7 +83,7 @@ class NodeChannel final : public IPC::Channel::Listener {
   void AcceptInvite(const NodeName& aRealName, const PortName& aInitialPort);
 
   // The PID of the remote process, once known. May be called from any thread.
-  int32_t OtherPid() const { return mOtherPid; }
+  base::ProcessId OtherPid() const { return mOtherPid; }
 
   // Start communicating with the remote process using this NodeChannel. MUST BE
   // CALLED FROM THE IO THREAD.
@@ -109,14 +110,14 @@ class NodeChannel final : public IPC::Channel::Listener {
   void FinalDestroy();
 
   // Update the known PID for the remote process. IO THREAD ONLY
-  void SetOtherPid(int32_t aNewPid);
+  void SetOtherPid(base::ProcessId aNewPid);
 
   void SendMessage(UniquePtr<IPC::Message> aMessage);
   void DoSendMessage(UniquePtr<IPC::Message> aMessage);
 
   // IPC::Channel::Listener implementation
   void OnMessageReceived(IPC::Message&& aMessage) override;
-  void OnChannelConnected(int32_t aPeerPid) override;
+  void OnChannelConnected(base::ProcessId aPeerPid) override;
   void OnChannelError() override;
 
   // NOTE: This strong reference will create a reference cycle between the
@@ -133,7 +134,7 @@ class NodeChannel final : public IPC::Channel::Listener {
   // NOTE: This won't change once the connection has been established, but may
   // be `-1` until then. This will only be written to on the IO thread, but may
   // be read from other threads.
-  std::atomic<int32_t> mOtherPid;
+  std::atomic<base::ProcessId> mOtherPid;
 
   // WARNING: This must only be accessed on the IO thread.
   mozilla::UniquePtr<IPC::Channel> mChannel;

ipc/glue/NodeController.cpp

@@ -283,7 +283,7 @@ void NodeController::DropPeer(NodeName aNodeName) {
 
   NODECONTROLLER_LOG(LogLevel::Info, "Dropping Peer %s (pid: %d)",
                      ToString(aNodeName).c_str(),
-                     channel ? channel->OtherPid() : -1);
+                     channel ? channel->OtherPid() : base::kInvalidProcessId);
 
   if (channel) {
     channel->Close();
@@ -670,7 +670,7 @@ void NodeController::OnRequestIntroduction(const NodeName& aFromNode,
     // an invalid introduction to content to clean up any pending outbound
     // messages.
     NodeChannel::Introduction intro{aName, nullptr, IPC::Channel::MODE_SERVER,
-                                    peerA->OtherPid(), -1};
+                                    peerA->OtherPid(), base::kInvalidProcessId};
     peerA->Introduce(std::move(intro));
     return;
   }

ipc/glue/UtilityProcessHost.cpp

@@ -141,7 +141,7 @@ RefPtr<GenericNonExclusivePromise> UtilityProcessHost::LaunchPromise() {
   return mLaunchPromise;
 }
 
-void UtilityProcessHost::OnChannelConnected(int32_t peer_pid) {
+void UtilityProcessHost::OnChannelConnected(base::ProcessId peer_pid) {
   MOZ_ASSERT(!NS_IsMainThread());
 
   GeckoChildProcessHost::OnChannelConnected(peer_pid);

ipc/glue/UtilityProcessHost.h

@@ -83,7 +83,7 @@ class UtilityProcessHost final : public mozilla::ipc::GeckoChildProcessHost {
   }
 
   // Called on the IO thread.
-  void OnChannelConnected(int32_t peer_pid) override;
+  void OnChannelConnected(base::ProcessId peer_pid) override;
   void OnChannelError() override;
 
 #if defined(XP_MACOSX) && defined(MOZ_SANDBOX)

netwerk/ipc/SocketProcessHost.cpp

@@ -96,7 +96,7 @@ static void HandleErrorAfterDestroy(
       }));
 }
 
-void SocketProcessHost::OnChannelConnected(int32_t peer_pid) {
+void SocketProcessHost::OnChannelConnected(base::ProcessId peer_pid) {
   MOZ_ASSERT(!NS_IsMainThread());
 
   GeckoChildProcessHost::OnChannelConnected(peer_pid);

netwerk/ipc/SocketProcessHost.h

@@ -74,7 +74,7 @@ class SocketProcessHost final : public mozilla::ipc::GeckoChildProcessHost {
   }
 
   // Called on the IO thread.
-  void OnChannelConnected(int32_t peer_pid) override;
+  void OnChannelConnected(base::ProcessId peer_pid) override;
   void OnChannelError() override;
 
 #if defined(XP_MACOSX) && defined(MOZ_SANDBOX)