dwarf2out.c (is_inlined_entry_point): New

* dwarf2out.c (is_inlined_entry_point): New
(add_high_low_attributes): Emit DW_AT_entry_pc along with
DW_AT_ranges if the first subblock is the entry point.

From-SVN: r122650

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2007-03-07  Alexandre Oliva  <aoliva@redhat.com>
+
+	* dwarf2out.c (is_inlined_entry_point): New
+	(add_high_low_attributes): Emit DW_AT_entry_pc along with
+	DW_AT_ranges if the first subblock is the entry point.
+
 2007-03-06  David Daney  <ddaney@avtrex.com>
 
 	* doc/install.texi (mips-*-*): Change recommended binutils

gcc/dwarf2out.c

@@ -12233,6 +12233,36 @@ add_call_src_coords_attributes (tree stmt, dw_die_ref die)
   add_AT_unsigned (die, DW_AT_call_line, s.line);
 }
 
+
+/* If STMT's abstract origin is a function declaration and STMT's
+   first subblock's abstract origin is the function's outermost block,
+   then we're looking at the main entry point.  */
+static bool
+is_inlined_entry_point (tree stmt)
+{
+  tree decl, block;
+
+  if (!stmt || TREE_CODE (stmt) != BLOCK)
+    return false;
+
+  decl = block_ultimate_origin (stmt);
+
+  if (!decl || TREE_CODE (decl) != FUNCTION_DECL)
+    return false;
+
+  block = BLOCK_SUBBLOCKS (stmt);
+
+  if (block)
+    {
+      if (TREE_CODE (block) != BLOCK)
+	return false;
+
+      block = block_ultimate_origin (block);
+    }
+
+  return block == DECL_INITIAL (decl);
+}
+
 /* A helper function for gen_lexical_block_die and gen_inlined_subroutine_die.
    Add low_pc and high_pc attributes to the DIE for a block STMT.  */
 
@@ -12245,6 +12275,13 @@ add_high_low_attributes (tree stmt, dw_die_ref die)
     {
       tree chain;
 
+      if (is_inlined_entry_point (stmt))
+	{
+	  ASM_GENERATE_INTERNAL_LABEL (label, BLOCK_BEGIN_LABEL,
+				       BLOCK_NUMBER (stmt));
+	  add_AT_lbl_id (die, DW_AT_entry_pc, label);
+	}
+
       add_AT_range_list (die, DW_AT_ranges, add_ranges (stmt));
 
       chain = BLOCK_FRAGMENT_CHAIN (stmt);