* dwarf2read.c (dwarf2_const_value) <DW_form_addr>: Create a

LOC_COMPUTED symbol.
	* dwarf2loc.c (dwarf2_evaluate_loc_desc): Set new field.
	(dwarf2_loc_desc_needs_frame): Likewise.
	(compile_dwarf_to_ax) <DW_OP_addr>: Use offset.
	* dwarf2expr.h (struct dwarf_expr_context) <offset>: New field.
	* dwarf2expr.c (execute_stack_op) <DW_OP_addr>: Use offset.
	* dwarf2-frame.c (execute_stack_op): Set 'offset' field.  Add
	'offset' argument.
	(struct dwarf2_frame_cache) <text_offset>: New field.
	(dwarf2_frame_cache): Set new field.
	(dwarf2_frame_prev_register): Update.
	(dwarf2_frame_sniffer): Update.
	(dwarf2_frame_base_sniffer): Update.
	(dwarf2_frame_find_fde): Add 'out_offset' argument.

gdb/ChangeLog

@@ -1,3 +1,21 @@
+2010-07-07  Tom Tromey  <tromey@redhat.com>
+
+	* dwarf2read.c (dwarf2_const_value) <DW_form_addr>: Create a
+	LOC_COMPUTED symbol.
+	* dwarf2loc.c (dwarf2_evaluate_loc_desc): Set new field.
+	(dwarf2_loc_desc_needs_frame): Likewise.
+	(compile_dwarf_to_ax) <DW_OP_addr>: Use offset.
+	* dwarf2expr.h (struct dwarf_expr_context) <offset>: New field.
+	* dwarf2expr.c (execute_stack_op) <DW_OP_addr>: Use offset.
+	* dwarf2-frame.c (execute_stack_op): Set 'offset' field.  Add
+	'offset' argument.
+	(struct dwarf2_frame_cache) <text_offset>: New field.
+	(dwarf2_frame_cache): Set new field.
+	(dwarf2_frame_prev_register): Update.
+	(dwarf2_frame_sniffer): Update.
+	(dwarf2_frame_base_sniffer): Update.
+	(dwarf2_frame_find_fde): Add 'out_offset' argument.
+
 2010-07-07  Sergio Durigan Junior  <sergiodj@linux.vnet.ibm.com>
 	    Thiago Jung Bauermann  <bauerman@br.ibm.com>
 

gdb/dwarf2-frame.c

@@ -150,7 +150,8 @@ struct comp_unit
   bfd_vma tbase;
 };
 
-static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc);
+static struct dwarf2_fde *dwarf2_frame_find_fde (CORE_ADDR *pc,
+						 CORE_ADDR *out_offset);
 
 static int dwarf2_frame_adjust_regnum (struct gdbarch *gdbarch, int regnum,
 				       int eh_frame_p);
@@ -369,8 +370,8 @@ register %s (#%d) at %s"),
 
 static CORE_ADDR
 execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size,
-		  struct frame_info *this_frame, CORE_ADDR initial,
+		  CORE_ADDR offset, struct frame_info *this_frame,
-		  int initial_in_stack_memory)
+		  CORE_ADDR initial, int initial_in_stack_memory)
 {
   struct dwarf_expr_context *ctx;
   CORE_ADDR result;
@@ -381,6 +382,7 @@ execute_stack_op (const gdb_byte *exp, ULONGEST len, int addr_size,
 
   ctx->gdbarch = get_frame_arch (this_frame);
   ctx->addr_size = addr_size;
+  ctx->offset = offset;
   ctx->baton = this_frame;
   ctx->read_reg = read_reg;
   ctx->read_mem = read_mem;
@@ -901,6 +903,9 @@ struct dwarf2_frame_cache
 
   /* Target address size in bytes.  */
   int addr_size;
+
+  /* The .text offset.  */
+  CORE_ADDR text_offset;
 };
 
 static struct dwarf2_frame_cache *
@@ -944,7 +949,7 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
   fs->pc = get_frame_address_in_block (this_frame);
 
   /* Find the correct FDE.  */
-  fde = dwarf2_frame_find_fde (&fs->pc);
+  fde = dwarf2_frame_find_fde (&fs->pc, &cache->text_offset);
   gdb_assert (fde != NULL);
 
   /* Extract any interesting information from the CIE.  */
@@ -981,7 +986,8 @@ dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
     case CFA_EXP:
       cache->cfa =
 	execute_stack_op (fs->regs.cfa_exp, fs->regs.cfa_exp_len,
-			  cache->addr_size, this_frame, 0, 0);
+			  cache->addr_size, cache->text_offset,
+			  this_frame, 0, 0);
       break;
 
     default:
@@ -1137,7 +1143,8 @@ dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache,
     case DWARF2_FRAME_REG_SAVED_EXP:
       addr = execute_stack_op (cache->reg[regnum].loc.exp,
 			       cache->reg[regnum].exp_len,
-			       cache->addr_size, this_frame, cache->cfa, 1);
+			       cache->addr_size, cache->text_offset,
+			       this_frame, cache->cfa, 1);
       return frame_unwind_got_memory (this_frame, regnum, addr);
 
     case DWARF2_FRAME_REG_SAVED_VAL_OFFSET:
@@ -1147,7 +1154,8 @@ dwarf2_frame_prev_register (struct frame_info *this_frame, void **this_cache,
     case DWARF2_FRAME_REG_SAVED_VAL_EXP:
       addr = execute_stack_op (cache->reg[regnum].loc.exp,
 			       cache->reg[regnum].exp_len,
-			       cache->addr_size, this_frame, cache->cfa, 1);
+			       cache->addr_size, cache->text_offset,
+			       this_frame, cache->cfa, 1);
       return frame_unwind_got_constant (this_frame, regnum, addr);
 
     case DWARF2_FRAME_REG_UNSPECIFIED:
@@ -1197,7 +1205,7 @@ dwarf2_frame_sniffer (const struct frame_unwind *self,
      extend one byte before its start address or we could potentially
      select the FDE of the previous function.  */
   CORE_ADDR block_addr = get_frame_address_in_block (this_frame);
-  struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr);
+  struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr, NULL);
 
   if (!fde)
     return 0;
@@ -1270,7 +1278,7 @@ dwarf2_frame_base_sniffer (struct frame_info *this_frame)
 {
   CORE_ADDR block_addr = get_frame_address_in_block (this_frame);
 
-  if (dwarf2_frame_find_fde (&block_addr))
+  if (dwarf2_frame_find_fde (&block_addr, NULL))
     return &dwarf2_frame_base;
 
   return NULL;
@@ -1582,7 +1590,7 @@ bsearch_fde_cmp (const void *key, const void *element)
    inital location associated with it into *PC.  */
 
 static struct dwarf2_fde *
-dwarf2_frame_find_fde (CORE_ADDR *pc)
+dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset)
 {
   struct objfile *objfile;
 
@@ -1617,6 +1625,8 @@ dwarf2_frame_find_fde (CORE_ADDR *pc)
       if (p_fde != NULL)
         {
           *pc = (*p_fde)->initial_location + offset;
+	  if (out_offset)
+	    *out_offset = offset;
           return *p_fde;
         }
     }

gdb/dwarf2expr.c

@@ -403,6 +403,12 @@ execute_stack_op (struct dwarf_expr_context *ctx,
 	  result = extract_unsigned_integer (op_ptr,
 					     ctx->addr_size, byte_order);
 	  op_ptr += ctx->addr_size;
+	  /* Some versions of GCC emit DW_OP_addr before
+	     DW_OP_GNU_push_tls_address.  In this case the value is an
+	     index, not an address.  We don't support things like
+	     branching between the address and the TLS op.  */
+	  if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address)
+	    result += ctx->offset;
 	  break;
 
 	case DW_OP_const1u:

gdb/dwarf2expr.h

@@ -75,6 +75,9 @@ struct dwarf_expr_context
   /* Target address size in bytes.  */
   int addr_size;
 
+  /* Offset used to relocate DW_OP_addr argument.  */
+  CORE_ADDR offset;
+
   /* An opaque argument provided by the caller, which will be passed
      to all of the callback functions.  */
   void *baton;

gdb/dwarf2loc.c

@@ -891,6 +891,7 @@ dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame,
   struct dwarf_expr_baton baton;
   struct dwarf_expr_context *ctx;
   struct cleanup *old_chain;
+  struct objfile *objfile = dwarf2_per_cu_objfile (per_cu);
 
   if (size == 0)
     {
@@ -906,8 +907,9 @@ dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame,
   ctx = new_dwarf_expr_context ();
   old_chain = make_cleanup_free_dwarf_expr_context (ctx);
 
-  ctx->gdbarch = get_objfile_arch (dwarf2_per_cu_objfile (per_cu));
+  ctx->gdbarch = get_objfile_arch (objfile);
   ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
+  ctx->offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
   ctx->baton = &baton;
   ctx->read_reg = dwarf_expr_read_reg;
   ctx->read_mem = dwarf_expr_read_mem;
@@ -1083,6 +1085,7 @@ dwarf2_loc_desc_needs_frame (const gdb_byte *data, unsigned short size,
   struct dwarf_expr_context *ctx;
   int in_reg;
   struct cleanup *old_chain;
+  struct objfile *objfile = dwarf2_per_cu_objfile (per_cu);
 
   baton.needs_frame = 0;
   baton.per_cu = per_cu;
@@ -1090,8 +1093,9 @@ dwarf2_loc_desc_needs_frame (const gdb_byte *data, unsigned short size,
   ctx = new_dwarf_expr_context ();
   old_chain = make_cleanup_free_dwarf_expr_context (ctx);
 
-  ctx->gdbarch = get_objfile_arch (dwarf2_per_cu_objfile (per_cu));
+  ctx->gdbarch = get_objfile_arch (objfile);
   ctx->addr_size = dwarf2_per_cu_addr_size (per_cu);
+  ctx->offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
   ctx->baton = &baton;
   ctx->read_reg = needs_frame_read_reg;
   ctx->read_mem = needs_frame_read_mem;
@@ -1293,9 +1297,20 @@ compile_dwarf_to_ax (struct agent_expr *expr, struct axs_value *loc,
 	  break;
 
 	case DW_OP_addr:
-	  ax_const_l (expr, extract_unsigned_integer (op_ptr,
+	  uoffset = extract_unsigned_integer (op_ptr, addr_size, byte_order);
-						      addr_size, byte_order));
 	  op_ptr += addr_size;
+	  /* Some versions of GCC emit DW_OP_addr before
+	     DW_OP_GNU_push_tls_address.  In this case the value is an
+	     index, not an address.  We don't support things like
+	     branching between the address and the TLS op.  */
+	  if (op_ptr >= op_end || *op_ptr != DW_OP_GNU_push_tls_address)
+	    {
+	      struct objfile *objfile = dwarf2_per_cu_objfile (per_cu);
+
+	      uoffset += ANOFFSET (objfile->section_offsets,
+				   SECT_OFF_TEXT (objfile));
+	    }
+	  ax_const_l (expr, uoffset);
 	  break;
 
 	case DW_OP_const1u:

gdb/dwarf2read.c

@@ -9075,18 +9075,36 @@ dwarf2_const_value (struct attribute *attr, struct symbol *sym,
   switch (attr->form)
     {
     case DW_FORM_addr:
+      {
+	struct dwarf2_locexpr_baton *baton;
+	gdb_byte *data;
+
 	if (TYPE_LENGTH (SYMBOL_TYPE (sym)) != cu_header->addr_size)
 	  dwarf2_const_value_length_mismatch_complaint (SYMBOL_PRINT_NAME (sym),
 							cu_header->addr_size,
 							TYPE_LENGTH (SYMBOL_TYPE
 								     (sym)));
-      SYMBOL_VALUE_BYTES (sym) =
+	/* Symbols of this form are reasonably rare, so we just
-	obstack_alloc (&objfile->objfile_obstack, cu_header->addr_size);
+	   piggyback on the existing location code rather than writing
-      /* NOTE: cagney/2003-05-09: In-lined store_address call with
+	   a new implementation of symbol_computed_ops.  */
-         it's body - store_unsigned_integer.  */
+	baton = obstack_alloc (&objfile->objfile_obstack,
-      store_unsigned_integer (SYMBOL_VALUE_BYTES (sym), cu_header->addr_size,
+			       sizeof (struct dwarf2_locexpr_baton));
+	baton->per_cu = cu->per_cu;
+	gdb_assert (baton->per_cu);
+
+	baton->size = 2 + cu_header->addr_size;
+	data = obstack_alloc (&objfile->objfile_obstack, baton->size);
+	baton->data = data;
+
+	data[0] = DW_OP_addr;
+	store_unsigned_integer (&data[1], cu_header->addr_size,
 				byte_order, DW_ADDR (attr));
-      SYMBOL_CLASS (sym) = LOC_CONST_BYTES;
+	data[cu_header->addr_size + 1] = DW_OP_stack_value;
+
+	SYMBOL_COMPUTED_OPS (sym) = &dwarf2_locexpr_funcs;
+	SYMBOL_LOCATION_BATON (sym) = baton;
+	SYMBOL_CLASS (sym) = LOC_COMPUTED;
+      }
       break;
     case DW_FORM_string:
     case DW_FORM_strp: