Changes to be cleaner wrt. -Wextra

h/t @jerinjoy

See #901

riscv/debug_module.cc

@@ -87,20 +87,20 @@ void debug_module_t::reset()
       proc->halt_request = proc->HR_NONE;
   }
 
-  dmcontrol = {0};
+  memset(&dmcontrol, 0, sizeof(dmcontrol));
 
-  dmstatus = {0};
+  memset(&dmstatus, 0, sizeof(dmstatus));
   dmstatus.impebreak = config.support_impebreak;
   dmstatus.authenticated = !config.require_authentication;
   dmstatus.version = 2;
 
-  abstractcs = {0};
+  memset(&abstractcs, 0, sizeof(abstractcs));
   abstractcs.datacount = sizeof(dmdata) / 4;
   abstractcs.progbufsize = config.progbufsize;
 
-  abstractauto = {0};
+  memset(&abstractauto, 0, sizeof(abstractauto));
 
-  sbcs = {0};
+  memset(&sbcs, 0, sizeof(sbcs));
   if (config.max_sba_data_width > 0) {
     sbcs.version = 1;
     sbcs.asize = sizeof(reg_t) * 8;

riscv/decode.h

@@ -186,7 +186,7 @@ private:
 #ifndef RISCV_ENABLE_COMMITLOG
 # define WRITE_REG(reg, value) STATE.XPR.write(reg, value)
 # define WRITE_FREG(reg, value) DO_WRITE_FREG(reg, freg(value))
-# define WRITE_VSTATUS
+# define WRITE_VSTATUS {}
 #else
    /* 0 : int
     * 1 : floating

riscv/disasm.h

@@ -97,7 +97,7 @@ class disassembler_t
   static const unsigned int MASK1 = 0x7f;
   static const unsigned int MASK2 = 0xe003;
 
-  static const unsigned int hash(insn_bits_t insn, unsigned int mask)
+  static unsigned int hash(insn_bits_t insn, unsigned int mask)
   {
     return (insn & mask) % HASH_SIZE;
   }

riscv/interactive.cc

@@ -50,11 +50,9 @@ static std::string readline(int fd)
         continue;
       s.erase(s.end()-1);
 
-      if (noncanonical && write(fd, "\b \b", 3) != 3)
-        ; // shut up gcc
+      if (noncanonical && write(fd, "\b \b", 3) != 3) {}
     }
-    else if (noncanonical && write(fd, &ch, 1) != 1)
-      ; // shut up gcc
+    else if (noncanonical && write(fd, &ch, 1) != 1) {}
 
     if (ch == '\n')
       break;

riscv/processor.cc

@@ -234,6 +234,7 @@ void processor_t::parse_isa_string(const char* str)
                 extension_table[EXT_ZPSFOPERAND] = true;
                 extension_table[EXT_ZMMUL] = true; break;
       case 'q': max_isa |= 1L << ('d' - 'a');
+                // Fall through
       case 'd': max_isa |= 1L << ('f' - 'a');
     }
     max_isa |= 1L << (*p - 'a');