libopcodes/s390: add support for disassembler styling

This commit adds disassembler style to the libopcodes s390
disassembler.  This conversion was pretty straight forward, I just
converted the fprintf_func calls to fprintf_styled_func calls and
added an appropriate style.

For testing the new styling I just assembled then disassembled the
source files in gas/testsuite/gas/s390 and manually checked that the
styling looked reasonable.

If the user does not request styled output from objdump, then there
should be no change in the disassembler output after this commit.
diff --git a/opcodes/disassemble.c b/opcodes/disassemble.c
index 9c0daca..bd37f04 100644
--- a/opcodes/disassemble.c
+++ b/opcodes/disassemble.c
@@ -721,6 +721,7 @@
 #ifdef ARCH_s390
     case bfd_arch_s390:
       disassemble_init_s390 (info);
+      info->created_styled_output = true;
       break;
 #endif
 #ifdef ARCH_nds32
diff --git a/opcodes/s390-dis.c b/opcodes/s390-dis.c
index 03715ed..df44efb 100644
--- a/opcodes/s390-dis.c
+++ b/opcodes/s390-dis.c
@@ -186,7 +186,8 @@
   char separator;
 
   /* Mnemonic.  */
-  info->fprintf_func (info->stream, "%s", opcode->name);
+  info->fprintf_styled_func (info->stream, dis_style_mnemonic,
+			     "%s", opcode->name);
 
   /* Operands.  */
   separator = '\t';
@@ -222,24 +223,60 @@
 	}
 
       if (flags & S390_OPERAND_GPR)
-	info->fprintf_func (info->stream, "%c%%r%u", separator, val.u);
+	{
+	  info->fprintf_styled_func (info->stream, dis_style_text,
+				     "%c", separator);
+	  info->fprintf_styled_func (info->stream, dis_style_register,
+				     "%%r%u", val.u);
+	}
       else if (flags & S390_OPERAND_FPR)
-	info->fprintf_func (info->stream, "%c%%f%u", separator, val.u);
+	{
+	  info->fprintf_styled_func (info->stream, dis_style_text,
+				     "%c", separator);
+	  info->fprintf_styled_func (info->stream, dis_style_register,
+				     "%%f%u", val.u);
+	}
       else if (flags & S390_OPERAND_VR)
-	info->fprintf_func (info->stream, "%c%%v%i", separator, val.u);
+	{
+	  info->fprintf_styled_func (info->stream, dis_style_text,
+				     "%c", separator);
+	  info->fprintf_styled_func (info->stream, dis_style_register,
+				     "%%v%i", val.u);
+	}
       else if (flags & S390_OPERAND_AR)
-	info->fprintf_func (info->stream, "%c%%a%u", separator, val.u);
+	{
+	  info->fprintf_styled_func (info->stream, dis_style_text,
+				     "%c", separator);
+	  info->fprintf_styled_func (info->stream, dis_style_register,
+				     "%%a%u", val.u);
+	}
       else if (flags & S390_OPERAND_CR)
-	info->fprintf_func (info->stream, "%c%%c%u", separator, val.u);
+	{
+	  info->fprintf_styled_func (info->stream, dis_style_text,
+				     "%c", separator);
+	  info->fprintf_styled_func (info->stream, dis_style_register,
+				     "%%c%u", val.u);
+	}
       else if (flags & S390_OPERAND_PCREL)
 	{
-	  info->fprintf_func (info->stream, "%c", separator);
+	  info->fprintf_styled_func (info->stream, dis_style_text,
+				     "%c", separator);
 	  info->print_address_func (memaddr + val.i + val.i, info);
 	}
       else if (flags & S390_OPERAND_SIGNED)
-	info->fprintf_func (info->stream, "%c%i", separator, val.i);
+	{
+	  enum disassembler_style style;
+
+	  info->fprintf_styled_func (info->stream, dis_style_text,
+				     "%c", separator);
+	  style = ((flags & S390_OPERAND_DISP)
+		   ? dis_style_address_offset : dis_style_immediate);
+	  info->fprintf_styled_func (info->stream, style, "%i", val.i);
+	}
       else
 	{
+	  enum disassembler_style style;
+
 	  if (flags & S390_OPERAND_OR1)
 	    val.u &= ~1;
 	  if (flags & S390_OPERAND_OR2)
@@ -251,14 +288,18 @@
 	      && val.u == 0
 	      && opindex[1] == 0)
 	    break;
-	  info->fprintf_func (info->stream, "%c%u", separator, val.u);
+	  info->fprintf_styled_func (info->stream, dis_style_text,
+				     "%c", separator);
+	  style = ((flags & S390_OPERAND_DISP)
+		   ? dis_style_address_offset : dis_style_immediate);
+	  info->fprintf_styled_func (info->stream, style, "%u", val.u);
 	}
 
       if (flags & S390_OPERAND_DISP)
 	separator = '(';
       else if (flags & S390_OPERAND_BASE)
 	{
-	  info->fprintf_func (info->stream, ")");
+	  info->fprintf_styled_func (info->stream, dis_style_text, ")");
 	  separator = ',';
 	}
       else
@@ -361,19 +402,33 @@
       value = (value << 8) + (unsigned int) buffer[1];
       value = (value << 8) + (unsigned int) buffer[2];
       value = (value << 8) + (unsigned int) buffer[3];
-      info->fprintf_func (info->stream, ".long\t0x%08x", value);
+      info->fprintf_styled_func (info->stream, dis_style_assembler_directive,
+				 ".long");
+      info->fprintf_styled_func (info->stream, dis_style_text,
+				 "\t");
+      info->fprintf_styled_func (info->stream, dis_style_immediate,
+				 "0x%08x", value);
       return 4;
     case 2:
       value = (unsigned int) buffer[0];
       value = (value << 8) + (unsigned int) buffer[1];
-      info->fprintf_func (info->stream, ".short\t0x%04x", value);
+      info->fprintf_styled_func (info->stream, dis_style_assembler_directive,
+				 ".short");
+      info->fprintf_styled_func (info->stream, dis_style_text,
+				 "\t");
+      info->fprintf_styled_func (info->stream, dis_style_immediate,
+				 "0x%04x", value);
       return 2;
     default:
-      info->fprintf_func (info->stream, ".byte\t0x%02x",
-			  (unsigned int) buffer[0]);
+      info->fprintf_styled_func (info->stream, dis_style_assembler_directive,
+				 ".byte");
+      info->fprintf_styled_func (info->stream, dis_style_text,
+				 "\t");
+      info->fprintf_styled_func (info->stream, dis_style_immediate,
+				 "0x%02x", (unsigned int) buffer[0]);
       for (i = 1; i < bytes_to_dump; i++)
-	info->fprintf_func (info->stream, ",0x%02x",
-			  (unsigned int) buffer[i]);
+	info->fprintf_styled_func (info->stream, dis_style_immediate,
+				   "0x%02x", (unsigned int) buffer[i]);
       return bytes_to_dump;
     }
   return 0;