* dwarf2expr.h (dwarf2_read_address): Add gdbarch argument.

	* dwarf2expr.c (dwarf2_read_address): Add gdbarch argument.
	Call gdbarch_integer_to_address directly instead of converting
	to value and back.  Update comment.
	(execute_stack_op): Update call site.
	* dwarf2loc.c (find_location_expression): Likewise.
	(locexpr_describe_location): Update

	* dwarf2expr.h (struct dwarf_expr_context): Add gdbarch member.
	* dwarf2-frame.c (execute_stack_op): Initialize ctx->gdbarch.
	* dwarf2loc. (dwarf2_evaluate_loc_desc): Likewise.
	(dwarf2_loc_desc_needs_frame): Likewise.

5 files changed, 44 insertions, 26 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 602e6a6..ef10bbd 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,20 @@
 2008-09-05  Ulrich Weigand  <uweigand@de.ibm.com>
 
+	* dwarf2expr.h (dwarf2_read_address): Add gdbarch argument.
+	* dwarf2expr.c (dwarf2_read_address): Add gdbarch argument.
+	Call gdbarch_integer_to_address directly instead of converting
+	to value and back.  Update comment.
+	(execute_stack_op): Update call site.
+	* dwarf2loc.c (find_location_expression): Likewise.
+	(locexpr_describe_location): Update
+
+	* dwarf2expr.h (struct dwarf_expr_context): Add gdbarch member.
+	* dwarf2-frame.c (execute_stack_op): Initialize ctx->gdbarch.
+	* dwarf2loc. (dwarf2_evaluate_loc_desc): Likewise.
+	(dwarf2_loc_desc_needs_frame): Likewise.
+
+2008-09-05  Ulrich Weigand  <uweigand@de.ibm.com>
+
 	* breakpoint.h (struct bp_location): Change type of section
 	member to "struct obj_section *".
 	* tracepoint.h (struct tracepoint): Likewise.
diff --git a/gdb/dwarf2-frame.c b/gdb/dwarf2-frame.c
index bd1127c..c1b3e60 100644
--- a/gdb/dwarf2-frame.c
+++ b/gdb/dwarf2-frame.c
@@ -348,6 +348,7 @@ execute_stack_op (gdb_byte *exp, ULONGEST len, int addr_size,
   CORE_ADDR result;
 
   ctx = new_dwarf_expr_context ();
+  ctx->gdbarch = get_frame_arch (this_frame);
   ctx->addr_size = addr_size;
   ctx->baton = this_frame;
   ctx->read_reg = read_reg;
diff --git a/gdb/dwarf2expr.c b/gdb/dwarf2expr.c
index 93772a1..707c0de 100644
--- a/gdb/dwarf2expr.c
+++ b/gdb/dwarf2expr.c
@@ -204,7 +204,8 @@ read_sleb128 (gdb_byte *buf, gdb_byte *buf_end, LONGEST * r)
    doesn't extend past BUF_END.  */
 
 CORE_ADDR
-dwarf2_read_address (gdb_byte *buf, gdb_byte *buf_end, int addr_size)
+dwarf2_read_address (struct gdbarch *gdbarch, gdb_byte *buf,
+		     gdb_byte *buf_end, int addr_size)
 {
   CORE_ADDR result;
 
@@ -215,28 +216,18 @@ dwarf2_read_address (gdb_byte *buf, gdb_byte *buf_end, int addr_size)
      is sufficient for extracting an address.  However, some
      architectures (e.g. MIPS) use signed addresses and using
      extract_unsigned_integer() will not produce a correct
-     result.  Turning the unsigned integer into a value and then
-     decomposing that value as an address will cause
-     gdbarch_integer_to_address() to be invoked for those
-     architectures which require it.  Thus, using value_as_address()
-     will produce the correct result for both types of architectures.
-
-     One concern regarding the use of values for this purpose is
-     efficiency.  Obviously, these extra calls will take more time to
-     execute and creating a value takes more space, space which will
-     have to be garbage collected at a later time.  If constructing
-     and then decomposing a value for this purpose proves to be too
-     inefficient, then gdbarch_integer_to_address() can be called
-     directly.
+     result.  Make sure we invoke gdbarch_integer_to_address()
+     for those architectures which require it.
 
      The use of `unsigned_address_type' in the code below refers to
      the type of buf and has no bearing on the signedness of the
      address being returned.  */
 
-  result = value_as_address (value_from_longest 
-			      (unsigned_address_type (addr_size),
-			       extract_unsigned_integer (buf, addr_size)));
-  return result;
+  if (gdbarch_integer_to_address_p (gdbarch))
+    return gdbarch_integer_to_address
+	     (gdbarch, unsigned_address_type (addr_size), buf);
+
+  return extract_unsigned_integer (buf, addr_size);
 }
 
 /* Return the type of an address of size ADDR_SIZE,
@@ -339,7 +330,8 @@ execute_stack_op (struct dwarf_expr_context *ctx,
 	  break;
 
 	case DW_OP_addr:
-	  result = dwarf2_read_address (op_ptr, op_end, ctx->addr_size);
+	  result = dwarf2_read_address (ctx->gdbarch,
+					op_ptr, op_end, ctx->addr_size);
 	  op_ptr += ctx->addr_size;
 	  break;
 
@@ -559,7 +551,8 @@ execute_stack_op (struct dwarf_expr_context *ctx,
 	      {
 		gdb_byte *buf = alloca (ctx->addr_size);
 		(ctx->read_mem) (ctx->baton, buf, result, ctx->addr_size);
-		result = dwarf2_read_address (buf, buf + ctx->addr_size,
+		result = dwarf2_read_address (ctx->gdbarch,
+					      buf, buf + ctx->addr_size,
 					      ctx->addr_size);
 	      }
 	      break;
@@ -569,7 +562,8 @@ execute_stack_op (struct dwarf_expr_context *ctx,
 		int addr_size = *op_ptr++;
 		gdb_byte *buf = alloca (addr_size);
 		(ctx->read_mem) (ctx->baton, buf, result, addr_size);
-		result = dwarf2_read_address (buf, buf + addr_size,
+		result = dwarf2_read_address (ctx->gdbarch,
+					      buf, buf + addr_size,
 					      addr_size);
 	      }
 	      break;
diff --git a/gdb/dwarf2expr.h b/gdb/dwarf2expr.h
index 463c452..5d9581c 100644
--- a/gdb/dwarf2expr.h
+++ b/gdb/dwarf2expr.h
@@ -34,6 +34,9 @@ struct dwarf_expr_context
      number of elements allocated to the stack.  */
   int stack_len, stack_allocated;
 
+  /* Target architecture to use for address operations.  */
+  struct gdbarch *gdbarch;
+
   /* Target address size in bytes.  */
   int addr_size;
 
@@ -138,7 +141,7 @@ CORE_ADDR dwarf_expr_fetch (struct dwarf_expr_context *ctx, int n);
 
 gdb_byte *read_uleb128 (gdb_byte *buf, gdb_byte *buf_end, ULONGEST * r);
 gdb_byte *read_sleb128 (gdb_byte *buf, gdb_byte *buf_end, LONGEST * r);
-CORE_ADDR dwarf2_read_address (gdb_byte *buf, gdb_byte *buf_end,
-			       int addr_size);
+CORE_ADDR dwarf2_read_address (struct gdbarch *gdbarch, gdb_byte *buf,
+			       gdb_byte *buf_end, int addr_size);
 
 #endif /* dwarf2expr.h */
diff --git a/gdb/dwarf2loc.c b/gdb/dwarf2loc.c
index f6ef04f..080cd06 100644
--- a/gdb/dwarf2loc.c
+++ b/gdb/dwarf2loc.c
@@ -55,6 +55,7 @@ find_location_expression (struct dwarf2_loclist_baton *baton,
   gdb_byte *loc_ptr, *buf_end;
   int length;
   struct objfile *objfile = dwarf2_per_cu_objfile (baton->per_cu);
+  struct gdbarch *gdbarch = get_objfile_arch (objfile);
   unsigned int addr_size = dwarf2_per_cu_addr_size (baton->per_cu);
   CORE_ADDR base_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
   /* Adjust base_address for relocatable objects.  */
@@ -67,9 +68,9 @@ find_location_expression (struct dwarf2_loclist_baton *baton,
 
   while (1)
     {
-      low = dwarf2_read_address (loc_ptr, buf_end, addr_size);
+      low = dwarf2_read_address (gdbarch, loc_ptr, buf_end, addr_size);
       loc_ptr += addr_size;
-      high = dwarf2_read_address (loc_ptr, buf_end, addr_size);
+      high = dwarf2_read_address (gdbarch, loc_ptr, buf_end, addr_size);
       loc_ptr += addr_size;
 
       /* An end-of-list entry.  */
@@ -215,6 +216,7 @@ dwarf2_evaluate_loc_desc (struct symbol *var, struct frame_info *frame,
   baton.objfile = dwarf2_per_cu_objfile (per_cu);
 
   ctx = new_dwarf_expr_context ();
+  ctx->gdbarch = get_objfile_arch (baton.objfile);
   ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
   ctx->baton = &baton;
   ctx->read_reg = dwarf_expr_read_reg;
@@ -336,6 +338,7 @@ dwarf2_loc_desc_needs_frame (gdb_byte *data, unsigned short size,
   baton.needs_frame = 0;
 
   ctx = new_dwarf_expr_context ();
+  ctx->gdbarch = get_objfile_arch (dwarf2_per_cu_objfile (per_cu));
   ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
   ctx->baton = &baton;
   ctx->read_reg = needs_frame_read_reg;
@@ -492,7 +495,9 @@ locexpr_describe_location (struct symbol *symbol, struct ui_file *stream)
     if (dlbaton->data[0] == DW_OP_addr)
       {
 	struct objfile *objfile = dwarf2_per_cu_objfile (dlbaton->per_cu);
-	CORE_ADDR offset = dwarf2_read_address (&dlbaton->data[1],
+	struct gdbarch *gdbarch = get_objfile_arch (objfile);
+	CORE_ADDR offset = dwarf2_read_address (gdbarch,
+						&dlbaton->data[1],
 						&dlbaton->data[dlbaton->size - 1],
 						addr_size);
 	fprintf_filtered (stream,