sframe: gas: libsframe: define constants and remove magic numbers

Define constants in sframe.h for the various limits associated with the
range of offsets that can be encoded in the start address of an SFrame
FRE. E.g., sframe_frame_row_entry_addr1 is used when start address
offset can be encoded as 1-byte unsigned value.

Update the code in gas to use these defined constants as it checks for
these limits, and remove the usage of magic numbers.

ChangeLog:

	* gas/sframe-opt.c (sframe_estimate_size_before_relax):
	(sframe_convert_frag): Do not use magic numbers.
	* libsframe/sframe.c (sframe_calc_fre_type): Likewise.

include/ChangeLog:

	* sframe.h (SFRAME_FRE_TYPE_ADDR1_LIMIT): New constant.
	(SFRAME_FRE_TYPE_ADDR2_LIMIT): Likewise.
	(SFRAME_FRE_TYPE_ADDR4_LIMIT): Likewise.

gas/sframe-opt.c

@@ -53,9 +53,9 @@ sframe_estimate_size_before_relax (fragS *frag)
       widthS = exp->X_op_symbol;
       width = resolve_symbol_value (widthS);
 
-      if (width < 0x100)
+      if (width < SFRAME_FRE_TYPE_ADDR1_LIMIT)
 	ret = 1;
-      else if (width < 0x10000)
+      else if (width < SFRAME_FRE_TYPE_ADDR2_LIMIT)
 	ret = 2;
       else
 	ret = 4;
@@ -109,9 +109,9 @@ sframe_convert_frag (fragS *frag)
     {
       fsizeS = frag->fr_symbol;
       fsize = resolve_symbol_value (fsizeS);
-      if (fsize < 0x100)
+      if (fsize < SFRAME_FRE_TYPE_ADDR1_LIMIT)
 	func_info = SFRAME_FRE_TYPE_ADDR1;
-      else if (fsize < 0x10000)
+      else if (fsize < SFRAME_FRE_TYPE_ADDR2_LIMIT)
 	func_info = SFRAME_FRE_TYPE_ADDR2;
       else
 	func_info = SFRAME_FRE_TYPE_ADDR4;
@@ -133,11 +133,11 @@ sframe_convert_frag (fragS *frag)
       switch (frag->fr_subtype & 7)
 	{
 	case 1:
-	  gas_assert (fsize < 0x100);
+	  gas_assert (fsize < SFRAME_FRE_TYPE_ADDR1_LIMIT);
 	  frag->fr_literal[frag->fr_fix] = diff;
 	  break;
 	case 2:
-	  gas_assert (fsize < 0x10000);
+	  gas_assert (fsize < SFRAME_FRE_TYPE_ADDR2_LIMIT);
 	  md_number_to_chars (frag->fr_literal + frag->fr_fix, diff, 2);
 	  break;
 	case 4:

include/sframe.h

@@ -273,6 +273,7 @@ typedef struct sframe_fre_info
     fi
 */
 
+/* Used when SFRAME_FRE_TYPE_ADDR1 is specified as FRE type.  */
 typedef struct sframe_frame_row_entry_addr1
 {
   /* Start address of the frame row entry.  Encoded as an 1-byte unsigned
@@ -281,6 +282,11 @@ typedef struct sframe_frame_row_entry_addr1
   sframe_fre_info sfre_info;
 } ATTRIBUTE_PACKED sframe_frame_row_entry_addr1;
 
+/* Upper limit of start address in sframe_frame_row_entry_addr1
+   is 0x100 (not inclusive).  */
+#define SFRAME_FRE_TYPE_ADDR1_LIMIT  ((SFRAME_FRE_TYPE_ADDR1 + 1) * 8)
+
+/* Used when SFRAME_FRE_TYPE_ADDR2 is specified as FRE type.  */
 typedef struct sframe_frame_row_entry_addr2
 {
   /* Start address of the frame row entry.  Encoded as an 2-byte unsigned
@@ -289,6 +295,11 @@ typedef struct sframe_frame_row_entry_addr2
   sframe_fre_info sfre_info;
 } ATTRIBUTE_PACKED sframe_frame_row_entry_addr2;
 
+/* Upper limit of start address in sframe_frame_row_entry_addr2
+   is 0x10000 (not inclusive).  */
+#define SFRAME_FRE_TYPE_ADDR2_LIMIT  ((SFRAME_FRE_TYPE_ADDR2 * 2) * 8)
+
+/* Used when SFRAME_FRE_TYPE_ADDR4 is specified as FRE type.  */
 typedef struct sframe_frame_row_entry_addr4
 {
   /* Start address of the frame row entry.  Encoded as a 4-byte unsigned
@@ -297,6 +308,10 @@ typedef struct sframe_frame_row_entry_addr4
   sframe_fre_info sfre_info;
 } ATTRIBUTE_PACKED sframe_frame_row_entry_addr4;
 
+/* Upper limit of start address in sframe_frame_row_entry_addr2
+   is 0x100000000 (not inclusive).  */
+#define SFRAME_FRE_TYPE_ADDR4_LIMIT  ((SFRAME_FRE_TYPE_ADDR4 * 2) * 8)
+
 #ifdef	__cplusplus
 }
 #endif

libsframe/sframe.c

@@ -572,11 +572,11 @@ unsigned int
 sframe_calc_fre_type (unsigned int func_size)
 {
   unsigned int fre_type = 0;
-  if (func_size <= 0xff)
+  if (func_size < SFRAME_FRE_TYPE_ADDR1_LIMIT)
     fre_type = SFRAME_FRE_TYPE_ADDR1;
-  else if (func_size <= 0xffff)
+  else if (func_size < SFRAME_FRE_TYPE_ADDR2_LIMIT)
     fre_type = SFRAME_FRE_TYPE_ADDR2;
-  else if (func_size <= 0xffffffff)
+  else if (func_size < SFRAME_FRE_TYPE_ADDR4_LIMIT)
     fre_type = SFRAME_FRE_TYPE_ADDR4;
   return fre_type;
 }