Change value_contents_eq return bool

This patch changes value_contents_eq return type from int to bool.

gdb:

2017-11-24  Yao Qi  <yao.qi@linaro.org>

	* mi/mi-main.c (register_changed_p): Update.
	* value.c (value_contents_bits_eq): Change return type.
	(value_contents_eq): Likewise.
	* value.h: Update comments.

4 files changed, 26 insertions, 19 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index cbcd2de819e..c464f295ebf 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,12 @@
 2017-11-24  Yao Qi  <yao.qi@linaro.org>
 
+	* mi/mi-main.c (register_changed_p): Update.
+	* value.c (value_contents_bits_eq): Change return type.
+	(value_contents_eq): Likewise.
+	* value.h: Update comments.
+
+2017-11-24  Yao Qi  <yao.qi@linaro.org>
+
 	* mi/mi-main.c (mi_cmd_data_list_changed_registers): Remove
 	local 'changed'.  Remove error.
 	(register_changed_p): Change return type to bool.
diff --git a/gdb/mi/mi-main.c b/gdb/mi/mi-main.c
index 6933d1723f9..3261488d752 100644
--- a/gdb/mi/mi-main.c
+++ b/gdb/mi/mi-main.c
@@ -1012,8 +1012,8 @@ register_changed_p (int regnum, struct regcache *prev_regs,
   gdb_assert (prev_value != NULL);
   gdb_assert (this_value != NULL);
 
-  auto ret = value_contents_eq (prev_value, 0, this_value, 0,
-				register_size (gdbarch, regnum)) == 0;
+  auto ret = !value_contents_eq (prev_value, 0, this_value, 0,
+				 register_size (gdbarch, regnum));
 
   release_value (prev_value);
   release_value (this_value);
diff --git a/gdb/value.c b/gdb/value.c
index 1d1e619accb..3e0ca25fa79 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -808,7 +808,7 @@ find_first_range_overlap_and_match (struct ranges_and_idx *rp1,
    with LENGTH bits of VAL2's contents starting at OFFSET2 bits.
    Return true if the available bits match.  */
 
-static int
+static bool
 value_contents_bits_eq (const struct value *val1, int offset1,
 			const struct value *val2, int offset2,
 			int length)
@@ -847,7 +847,7 @@ value_contents_bits_eq (const struct value *val1, int offset1,
 	  if (!find_first_range_overlap_and_match (&rp1[i], &rp2[i],
 						   offset1, offset2, length,
 						   &l_tmp, &h_tmp))
-	    return 0;
+	    return false;
 
 	  /* We're interested in the lowest/first range found.  */
 	  if (i == 0 || l_tmp < l)
@@ -860,17 +860,17 @@ value_contents_bits_eq (const struct value *val1, int offset1,
       /* Compare the available/valid contents.  */
       if (memcmp_with_bit_offsets (val1->contents, offset1,
 				   val2->contents, offset2, l) != 0)
-	return 0;
+	return false;
 
       length -= h;
       offset1 += h;
       offset2 += h;
     }
 
-  return 1;
+  return true;
 }
 
-int
+bool
 value_contents_eq (const struct value *val1, LONGEST offset1,
 		   const struct value *val2, LONGEST offset2,
 		   LONGEST length)
diff --git a/gdb/value.h b/gdb/value.h
index 2b6ae35b8a9..e0de84427ea 100644
--- a/gdb/value.h
+++ b/gdb/value.h
@@ -549,12 +549,12 @@ extern void mark_value_bits_unavailable (struct value *value,
 
    then:
 
-     value_contents_eq(val, 0, val, 8, 6) => 1
-     value_contents_eq(val, 0, val, 4, 4) => 0
-     value_contents_eq(val, 0, val, 8, 8) => 0
-     value_contents_eq(val, 4, val, 12, 2) => 1
-     value_contents_eq(val, 4, val, 12, 4) => 0
-     value_contents_eq(val, 3, val, 4, 4) => 0
+     value_contents_eq(val, 0, val, 8, 6) => true
+     value_contents_eq(val, 0, val, 4, 4) => false
+     value_contents_eq(val, 0, val, 8, 8) => false
+     value_contents_eq(val, 4, val, 12, 2) => true
+     value_contents_eq(val, 4, val, 12, 4) => true
+     value_contents_eq(val, 3, val, 4, 4) => true
 
    If 'x's represent an unavailable byte, 'o' represents an optimized
    out byte, in a value with length 8:
@@ -564,9 +564,9 @@ extern void mark_value_bits_unavailable (struct value *value,
 
    then:
 
-     value_contents_eq(val, 0, val, 2, 2) => 1
-     value_contents_eq(val, 4, val, 6, 2) => 1
-     value_contents_eq(val, 0, val, 4, 4) => 0
+     value_contents_eq(val, 0, val, 2, 2) => true
+     value_contents_eq(val, 4, val, 6, 2) => true
+     value_contents_eq(val, 0, val, 4, 4) => true
 
    We only know whether a value chunk is unavailable or optimized out
    if we've tried to read it.  As this routine is used by printing
@@ -574,9 +574,9 @@ extern void mark_value_bits_unavailable (struct value *value,
    after the inferior is gone, it works with const values.  Therefore,
    this routine must not be called with lazy values.  */
 
-extern int value_contents_eq (const struct value *val1, LONGEST offset1,
-			      const struct value *val2, LONGEST offset2,
-			      LONGEST length);
+extern bool value_contents_eq (const struct value *val1, LONGEST offset1,
+			       const struct value *val2, LONGEST offset2,
+			       LONGEST length);
 
 /* Read LENGTH addressable memory units starting at MEMADDR into BUFFER,
    which is (or will be copied to) VAL's contents buffer offset by