misc: Add explicit overrides and fix other clang >= 3.5 issues

This patch adds explicit overrides as this is now required when using
"-Wall" with clang >= 3.5, the latter now part of the most recent
XCode. The patch consequently removes "virtual" for those methods
where "override" is added. The latter should be enough of an
indication.

As part of this patch, a few minor issues that clang >= 3.5 complains
about are also resolved (unused methods and variables).

3 files changed, 12 insertions, 11 deletions

diff --git a/src/arch/alpha/process.hh b/src/arch/alpha/process.hh
index cd45871b1..fcaa6539c 100644
--- a/src/arch/alpha/process.hh
+++ b/src/arch/alpha/process.hh
@@ -43,16 +43,17 @@ class AlphaLiveProcess : public LiveProcess
     AlphaLiveProcess(LiveProcessParams *params, ObjectFile *objFile);
 
     void loadState(CheckpointIn &cp) override;
-    void initState();
+    void initState() override;
 
     void argsInit(int intSize, int pageSize);
 
   public:
-    AlphaISA::IntReg getSyscallArg(ThreadContext *tc, int &i);
+    AlphaISA::IntReg getSyscallArg(ThreadContext *tc, int &i) override;
     /// Explicitly import the otherwise hidden getSyscallArg
     using LiveProcess::getSyscallArg;
-    void setSyscallArg(ThreadContext *tc, int i, AlphaISA::IntReg val);
-    void setSyscallReturn(ThreadContext *tc, SyscallReturn return_value);
+    void setSyscallArg(ThreadContext *tc, int i, AlphaISA::IntReg val) override;
+    void setSyscallReturn(ThreadContext *tc,
+                          SyscallReturn return_value) override;
 };
 
 /* No architectural page table defined for this ISA */
diff --git a/src/arch/alpha/system.hh b/src/arch/alpha/system.hh
index f8ca54506..d0be46135 100644
--- a/src/arch/alpha/system.hh
+++ b/src/arch/alpha/system.hh
@@ -55,7 +55,7 @@ class AlphaSystem : public System
     /**
      * Initialise the state of the system.
      */
-    virtual void initState();
+    void initState() override;
 
     /**
      * Serialization stuff
@@ -65,7 +65,7 @@ class AlphaSystem : public System
 
     /** Override startup() to provide a path to call setupFuncEvents()
      */
-    virtual void startup();
+    void startup() override;
 
     /**
      * Set the m5AlphaAccess pointer in the console
@@ -121,7 +121,7 @@ class AlphaSystem : public System
         return addFuncEvent<T>(consoleSymtab, lbl);
     }
 
-    virtual Addr fixFuncEventAddr(Addr addr);
+    Addr fixFuncEventAddr(Addr addr) override;
 
   public:
     void setIntrFreq(Tick freq) { intrFreq = freq; }
diff --git a/src/arch/alpha/tlb.hh b/src/arch/alpha/tlb.hh
index a8bdf30e1..b9b6228e2 100644
--- a/src/arch/alpha/tlb.hh
+++ b/src/arch/alpha/tlb.hh
@@ -85,21 +85,21 @@ class TLB : public BaseTLB
     TLB(const Params *p);
     virtual ~TLB();
 
-    void takeOverFrom(BaseTLB *otlb) {}
+    void takeOverFrom(BaseTLB *otlb) override {}
 
-    virtual void regStats();
+    void regStats() override;
 
     int getsize() const { return table.size(); }
 
     TlbEntry &index(bool advance = true);
     void insert(Addr vaddr, TlbEntry &entry);
 
-    void flushAll();
+    void flushAll() override;
     void flushProcesses();
     void flushAddr(Addr addr, uint8_t asn);
 
     void
-    demapPage(Addr vaddr, uint64_t asn)
+    demapPage(Addr vaddr, uint64_t asn) override
     {
         assert(asn < (1 << 8));
         flushAddr(vaddr, asn);