read/write_pieced_value: Remove unnecessary variable copies

In read_pieced_value's main loop, the variables `dest_offset_bits' and
`source_offset_bits' are basically just copies of `offset' and
`bits_to_skip', respectively.  In write_pieced_value the copies are
reversed.  This is not very helpful when trying to keep the logic between
these functions in sync.  Since the copies are unnecessary, this patch
just removes them.

gdb/ChangeLog:

	* dwarf2loc.c (read_pieced_value): Remove unnecessary variables
	dest_offset_bits and source_offset_bits.
	(write_pieced_value): Likewise.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1d383cc0be0151818dbaeddbf4785d5387f14d5a..6ca4b5ccca25441b7685e6204b1543a181d2a932 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2017-06-13  Andreas Arnez  <arnez@linux.vnet.ibm.com>
+
+       * dwarf2loc.c (read_pieced_value): Remove unnecessary variables
+       dest_offset_bits and source_offset_bits.
+       (write_pieced_value): Likewise.
+
 2017-06-13  Andreas Arnez  <arnez@linux.vnet.ibm.com>
 
        * dwarf2loc.c (read_pieced_value): Respect the piece offset, as

diff --git a/gdb/dwarf2loc.c b/gdb/dwarf2loc.c
index 23901f0e7c15ca2f6ce03d2ef50337722f07533e..ed5b29ced33d2c5c633c9e0e154666b22fdb7d69 100644 (file)
--- a/gdb/dwarf2loc.c
+++ b/gdb/dwarf2loc.c
@@ -1790,25 +1790,16 @@ read_pieced_value (struct value *v)
   else
     max_offset = 8 * TYPE_LENGTH (value_type (v));
 
-  for (i = 0; i < c->n_pieces && offset < max_offset; i++)
+  /* Advance to the first non-skipped piece.  */
+  for (i = 0; i < c->n_pieces && bits_to_skip >= c->pieces[i].size; i++)
+    bits_to_skip -= c->pieces[i].size;
+
+  for (; i < c->n_pieces && offset < max_offset; i++)
     {
       struct dwarf_expr_piece *p = &c->pieces[i];
       size_t this_size, this_size_bits;
-      long dest_offset_bits, source_offset_bits;
-
-      /* Compute size, source, and destination offsets for copying, in
-        bits.  */
-      this_size_bits = p->size;
-      if (bits_to_skip > 0 && bits_to_skip >= this_size_bits)
-       {
-         bits_to_skip -= this_size_bits;
-         continue;
-       }
-      source_offset_bits = bits_to_skip;
-      this_size_bits -= bits_to_skip;
-      bits_to_skip = 0;
-      dest_offset_bits = offset;
 
+      this_size_bits = p->size - bits_to_skip;
       if (this_size_bits > max_offset - offset)
        this_size_bits = max_offset - offset;
 
@@ -1827,16 +1818,16 @@ read_pieced_value (struct value *v)
                && p->offset + p->size < reg_bits)
              {
                /* Big-endian, and we want less than full size.  */
-               source_offset_bits += reg_bits - (p->offset + p->size);
+               bits_to_skip += reg_bits - (p->offset + p->size);
              }
            else
-             source_offset_bits += p->offset;
+             bits_to_skip += p->offset;
 
-           this_size = bits_to_bytes (source_offset_bits, this_size_bits);
+           this_size = bits_to_bytes (bits_to_skip, this_size_bits);
            buffer.reserve (this_size);
 
            if (!get_frame_register_bytes (frame, gdb_regnum,
-                                          source_offset_bits / 8,
+                                          bits_to_skip / 8,
                                           this_size, buffer.data (),
                                           &optim, &unavail))
              {
@@ -1846,24 +1837,23 @@ read_pieced_value (struct value *v)
                  mark_value_bits_unavailable (v, offset, this_size_bits);
                break;
              }
-
-           copy_bitwise (contents, dest_offset_bits,
-                         buffer.data (), source_offset_bits % 8,
+           copy_bitwise (contents, offset,
+                         buffer.data (), bits_to_skip % 8,
                          this_size_bits, bits_big_endian);
          }
          break;
 
        case DWARF_VALUE_MEMORY:
-         source_offset_bits += p->offset;
-         this_size = bits_to_bytes (source_offset_bits, this_size_bits);
+         bits_to_skip += p->offset;
+         this_size = bits_to_bytes (bits_to_skip, this_size_bits);
          buffer.reserve (this_size);
 
          read_value_memory (v, offset,
                             p->v.mem.in_stack_memory,
-                            p->v.mem.addr + source_offset_bits / 8,
+                            p->v.mem.addr + bits_to_skip / 8,
                             buffer.data (), this_size);
-         copy_bitwise (contents, dest_offset_bits,
-                       buffer.data (), source_offset_bits % 8,
+         copy_bitwise (contents, offset,
+                       buffer.data (), bits_to_skip % 8,
                        this_size_bits, bits_big_endian);
          break;
 
@@ -1880,14 +1870,13 @@ read_pieced_value (struct value *v)
 
            /* Piece is anchored at least significant bit end.  */
            if (gdbarch_byte_order (objfile_gdbarch) == BFD_ENDIAN_BIG)
-             source_offset_bits += (stack_value_size_bits
-                                    - p->offset - p->size);
+             bits_to_skip += stack_value_size_bits - p->offset - p->size;
            else
-             source_offset_bits += p->offset;
+             bits_to_skip += p->offset;
 
-           copy_bitwise (contents, dest_offset_bits,
+           copy_bitwise (contents, offset,
                          value_contents_all (p->v.value),
-                         source_offset_bits,
+                         bits_to_skip,
                          this_size_bits, bits_big_endian);
          }
          break;
@@ -1898,14 +1887,14 @@ read_pieced_value (struct value *v)
            size_t n = this_size_bits;
 
            /* Cut off at the end of the implicit value.  */
-           source_offset_bits += p->offset;
-           if (source_offset_bits >= literal_size_bits)
+           bits_to_skip += p->offset;
+           if (bits_to_skip >= literal_size_bits)
              break;
-           if (n > literal_size_bits - source_offset_bits)
-             n = literal_size_bits - source_offset_bits;
+           if (n > literal_size_bits - bits_to_skip)
+             n = literal_size_bits - bits_to_skip;
 
-           copy_bitwise (contents, dest_offset_bits,
-                         p->v.literal.data, source_offset_bits,
+           copy_bitwise (contents, offset,
+                         p->v.literal.data, bits_to_skip,
                          n, bits_big_endian);
          }
          break;
@@ -1924,6 +1913,7 @@ read_pieced_value (struct value *v)
        }
 
       offset += this_size_bits;
+      bits_to_skip = 0;
     }
 }
 
@@ -1959,23 +1949,16 @@ write_pieced_value (struct value *to, struct value *from)
   else
     max_offset = 8 * TYPE_LENGTH (value_type (to));
 
-  for (i = 0; i < c->n_pieces && offset < max_offset; i++)
+  /* Advance to the first non-skipped piece.  */
+  for (i = 0; i < c->n_pieces && bits_to_skip >= c->pieces[i].size; i++)
+    bits_to_skip -= c->pieces[i].size;
+
+  for (; i < c->n_pieces && offset < max_offset; i++)
     {
       struct dwarf_expr_piece *p = &c->pieces[i];
       size_t this_size_bits, this_size;
-      long dest_offset_bits, source_offset_bits;
-
-      this_size_bits = p->size;
-      if (bits_to_skip > 0 && bits_to_skip >= this_size_bits)
-       {
-         bits_to_skip -= this_size_bits;
-         continue;
-       }
-      dest_offset_bits = bits_to_skip;
-      this_size_bits -= bits_to_skip;
-      bits_to_skip = 0;
-      source_offset_bits = offset;
 
+      this_size_bits = p->size - bits_to_skip;
       if (this_size_bits > max_offset - offset)
        this_size_bits = max_offset - offset;
 
@@ -1992,22 +1975,22 @@ write_pieced_value (struct value *to, struct value *from)
                && p->offset + p->size < reg_bits)
              {
                /* Big-endian, and we want less than full size.  */
-               dest_offset_bits += reg_bits - (p->offset + p->size);
+               bits_to_skip += reg_bits - (p->offset + p->size);
              }
            else
-             dest_offset_bits += p->offset;
+             bits_to_skip += p->offset;
 
-           this_size = bits_to_bytes (dest_offset_bits, this_size_bits);
+           this_size = bits_to_bytes (bits_to_skip, this_size_bits);
            buffer.reserve (this_size);
 
-           if (dest_offset_bits % 8 != 0 || this_size_bits % 8 != 0)
+           if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0)
              {
                /* Data is copied non-byte-aligned into the register.
                   Need some bits from original register value.  */
                int optim, unavail;
 
                if (!get_frame_register_bytes (frame, gdb_regnum,
-                                              dest_offset_bits / 8,
+                                              bits_to_skip / 8,
                                               this_size, buffer.data (),
                                               &optim, &unavail))
                  {
@@ -2024,34 +2007,34 @@ write_pieced_value (struct value *to, struct value *from)
                  }
              }
 
-           copy_bitwise (buffer.data (), dest_offset_bits % 8,
-                         contents, source_offset_bits,
+           copy_bitwise (buffer.data (), bits_to_skip % 8,
+                         contents, offset,
                          this_size_bits, bits_big_endian);
            put_frame_register_bytes (frame, gdb_regnum,
-                                     dest_offset_bits / 8,
+                                     bits_to_skip / 8,
                                      this_size, buffer.data ());
          }
          break;
        case DWARF_VALUE_MEMORY:
          {
-           dest_offset_bits += p->offset;
+           bits_to_skip += p->offset;
 
-           CORE_ADDR start_addr = p->v.mem.addr + dest_offset_bits / 8;
+           CORE_ADDR start_addr = p->v.mem.addr + bits_to_skip / 8;
 
-           if (dest_offset_bits % 8 == 0 && this_size_bits % 8 == 0
-               && source_offset_bits % 8 == 0)
+           if (bits_to_skip % 8 == 0 && this_size_bits % 8 == 0
+               && offset % 8 == 0)
              {
                /* Everything is byte-aligned; no buffer needed.  */
                write_memory (start_addr,
-                             contents + source_offset_bits / 8,
+                             contents + offset / 8,
                              this_size_bits / 8);
                break;
              }
 
-           this_size = bits_to_bytes (dest_offset_bits, this_size_bits);
+           this_size = bits_to_bytes (bits_to_skip, this_size_bits);
            buffer.reserve (this_size);
 
-           if (dest_offset_bits % 8 != 0 || this_size_bits % 8 != 0)
+           if (bits_to_skip % 8 != 0 || this_size_bits % 8 != 0)
              {
                if (this_size <= 8)
                  {
@@ -2068,8 +2051,8 @@ write_pieced_value (struct value *to, struct value *from)
                  }
              }
 
-           copy_bitwise (buffer.data (), dest_offset_bits % 8,
-                         contents, source_offset_bits,
+           copy_bitwise (buffer.data (), bits_to_skip % 8,
+                         contents, offset,
                          this_size_bits, bits_big_endian);
            write_memory (start_addr, buffer.data (), this_size);
          }
@@ -2079,6 +2062,7 @@ write_pieced_value (struct value *to, struct value *from)
          break;
        }
       offset += this_size_bits;
+      bits_to_skip = 0;
     }
 }