Revert:

	2007-04-23  Jan Hubicka  <jh@suse.cz>
	* function.c (init_function_start): Don't init line number info.
	(expand_function_end): Update.
	(reset_block_changes, record_block_change, finalize_block_changes,
	check_block_change, free_block_changes): Kill.
	* function.h (reset_block_changes, record_block_change,
	finalize_block_changes, check_block_change, free_block_changes): Remove
	prototypes.
	(struct function): Remove ib_boundaries_block.
	* emit-rtl.c (make_insn_raw, make_jump_insn_raw, make_call_insn_raw):
	Use curr_insn_locator to initialize locator.
	(emit_line_note): Remove.
	* cfgexpand.c (expand_gimple_cond_expr): Update.
	(construct_exit_block): Likewise.
	(tree_expand_cfg): Initialize/finalize locators.
	* expr.c (expand_expr_real): Update.
	* cfglayout.c (line_locators_locs, line_locators_lines,
	file_locators_locs, file_locators_files): Remove.
	(set_block_levels): Move to cfgexpand.c.
	(insn_locators_initialize): Remove.
	(pass_insn_locators_initialize): Remove.
	(locations_locators_locs, locations_locators_vals): New static vars.
	(curr_location, last_location, curr_block, last_block, curr_rtl_loc):
	Likewise.
	(insn_locators_alloc, insn_locators_finalize,
	set_curr_insn_source_location, set_curr_insn_block, curr_insn_locator):
	New functions.
	(locator_location): New.
	(locator_line, locator_file): Rewrite.
	* rtl.h (emit_line_note): Kill.
	(insn_locators_alloc, insn_locators_finalize,
	set_curr_insn_source_location, set_curr_insn_block, curr_insn_locator):
	Declare.
	* tree-inline.c (initialize_cfun): Do not initialize
	ib_boundaries_block.
	* passes.c (pass_insn_locators_initialize): Remove.

From-SVN: r124094

11 files changed, 316 insertions, 154 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d7ef0c9..5825ecc 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,44 @@
+2007-04-24  Jan Hubicka  <j@suse.cz>
+
+	Revert:
+
+	2007-04-23  Jan Hubicka  <jh@suse.cz>
+	* function.c (init_function_start): Don't init line number info.
+	(expand_function_end): Update.
+	(reset_block_changes, record_block_change, finalize_block_changes,
+	check_block_change, free_block_changes): Kill.
+	* function.h (reset_block_changes, record_block_change,
+	finalize_block_changes, check_block_change, free_block_changes): Remove
+	prototypes.
+	(struct function): Remove ib_boundaries_block.
+	* emit-rtl.c (make_insn_raw, make_jump_insn_raw, make_call_insn_raw):
+	Use curr_insn_locator to initialize locator.
+	(emit_line_note): Remove.
+	* cfgexpand.c (expand_gimple_cond_expr): Update.
+	(construct_exit_block): Likewise.
+	(tree_expand_cfg): Initialize/finalize locators.
+	* expr.c (expand_expr_real): Update.
+	* cfglayout.c (line_locators_locs, line_locators_lines,
+	file_locators_locs, file_locators_files): Remove.
+	(set_block_levels): Move to cfgexpand.c.
+	(insn_locators_initialize): Remove.
+	(pass_insn_locators_initialize): Remove.
+	(locations_locators_locs, locations_locators_vals): New static vars.
+	(curr_location, last_location, curr_block, last_block, curr_rtl_loc):
+	Likewise.
+	(insn_locators_alloc, insn_locators_finalize,
+	set_curr_insn_source_location, set_curr_insn_block, curr_insn_locator):
+	New functions.
+	(locator_location): New.
+	(locator_line, locator_file): Rewrite.
+	* rtl.h (emit_line_note): Kill.
+	(insn_locators_alloc, insn_locators_finalize,
+	set_curr_insn_source_location, set_curr_insn_block, curr_insn_locator):
+	Declare.
+	* tree-inline.c (initialize_cfun): Do not initialize
+	ib_boundaries_block.
+	* passes.c (pass_insn_locators_initialize): Remove.
+
 2007-04-24  Daniel Franke  <franke.daniel@gmail.com>
 
 	* doc/invoke.texi: Removed leading '-' from option index entries.
diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c
index 23cf447..ab2b9d3 100644
--- a/gcc/cfgexpand.c
+++ b/gcc/cfgexpand.c
@@ -1265,8 +1265,8 @@ expand_gimple_cond_expr (basic_block bb, tree stmt)
   extract_true_false_edges_from_block (bb, &true_edge, &false_edge);
   if (EXPR_LOCUS (stmt))
     {
-      set_curr_insn_source_location (*(EXPR_LOCUS (stmt)));
-      set_curr_insn_block (TREE_BLOCK (stmt));
+      emit_line_note (*(EXPR_LOCUS (stmt)));
+      record_block_change (TREE_BLOCK (stmt));
     }
 
   /* These flags have no purpose in RTL land.  */
@@ -1281,7 +1281,7 @@ expand_gimple_cond_expr (basic_block bb, tree stmt)
       add_reg_br_prob_note (last, true_edge->probability);
       maybe_dump_rtl_for_tree_stmt (stmt, last);
       if (EXPR_LOCUS (then_exp))
-	set_curr_insn_source_location (*(EXPR_LOCUS (then_exp)));
+	emit_line_note (*(EXPR_LOCUS (then_exp)));
       return NULL;
     }
   if (TREE_CODE (else_exp) == GOTO_EXPR && IS_EMPTY_STMT (then_exp))
@@ -1290,7 +1290,7 @@ expand_gimple_cond_expr (basic_block bb, tree stmt)
       add_reg_br_prob_note (last, false_edge->probability);
       maybe_dump_rtl_for_tree_stmt (stmt, last);
       if (EXPR_LOCUS (else_exp))
-	set_curr_insn_source_location (*(EXPR_LOCUS (else_exp)));
+	emit_line_note (*(EXPR_LOCUS (else_exp)));
       return NULL;
     }
   gcc_assert (TREE_CODE (then_exp) == GOTO_EXPR
@@ -1322,7 +1322,7 @@ expand_gimple_cond_expr (basic_block bb, tree stmt)
   maybe_dump_rtl_for_tree_stmt (stmt, last2);
 
   if (EXPR_LOCUS (else_exp))
-    set_curr_insn_source_location (*(EXPR_LOCUS (else_exp)));
+    emit_line_note (*(EXPR_LOCUS (else_exp)));
 
   return new_bb;
 }
@@ -1613,19 +1613,6 @@ construct_init_block (void)
   return init_block;
 }
 
-/* For each lexical block, set BLOCK_NUMBER to the depth at which it is
-   found in the block tree.  */
-
-static void
-set_block_levels (tree block, int level)
-{
-  while (block)
-    {
-      BLOCK_NUMBER (block) = level;
-      set_block_levels (BLOCK_SUBBLOCKS (block), level + 1);
-      block = BLOCK_CHAIN (block);
-    }
-}
 
 /* Create a block containing landing pads and similar stuff.  */
 
@@ -1650,7 +1637,7 @@ construct_exit_block (void)
     input_location = cfun->function_end_locus;
 
   /* The following insns belong to the top scope.  */
-  set_curr_insn_block (DECL_INITIAL (current_function_decl));
+  record_block_change (DECL_INITIAL (current_function_decl));
 
   /* Generate rtl for function exit.  */
   expand_function_end ();
@@ -1778,16 +1765,8 @@ tree_expand_cfg (void)
   /* Some backends want to know that we are expanding to RTL.  */
   currently_expanding_to_rtl = 1;
 
-  insn_locators_alloc ();
-  if (!DECL_BUILT_IN (current_function_decl))
-    set_curr_insn_source_location (DECL_SOURCE_LOCATION (current_function_decl));
-  set_curr_insn_block (DECL_INITIAL (current_function_decl));
-  prologue_locator = curr_insn_locator ();
-
-  /* Make sure first insn is a note even if we don't want linenums.
-     This makes sure the first insn will never be deleted.
-     Also, final expects a note to appear there.  */
-  emit_note (NOTE_INSN_DELETED);
+  /* Prepare the rtl middle end to start recording block changes.  */
+  reset_block_changes ();
 
   /* Mark arrays indexed with non-constant indices with TREE_ADDRESSABLE.  */
   discover_nonconstant_array_refs ();
@@ -1834,8 +1813,6 @@ tree_expand_cfg (void)
     bb = expand_gimple_basic_block (bb);
 
   construct_exit_block ();
-  set_curr_insn_block (DECL_INITIAL (current_function_decl));
-  insn_locators_finalize ();
 
   /* We're done expanding trees to RTL.  */
   currently_expanding_to_rtl = 0;
@@ -1866,6 +1843,8 @@ tree_expand_cfg (void)
      more CONCATs anywhere.  */
   generating_concat_p = 0;
 
+  finalize_block_changes ();
+
   if (dump_file)
     {
       fprintf (dump_file,
@@ -1896,9 +1875,6 @@ tree_expand_cfg (void)
   return_label = NULL;
   naked_return_label = NULL;
   free_histograms ();
-  /* Tag the blocks with a depth number so that change_scope can find
-     the common parent easily.  */
-  set_block_levels (DECL_INITIAL (cfun->decl), 0);
   return 0;
 }
 
diff --git a/gcc/cfglayout.c b/gcc/cfglayout.c
index c4ad2a8..0178431 100644
--- a/gcc/cfglayout.c
+++ b/gcc/cfglayout.c
@@ -48,6 +48,7 @@ static void record_effective_endpoints (void);
 static rtx label_for_bb (basic_block);
 static void fixup_reorder_chain (void);
 
+static void set_block_levels (tree, int);
 static void change_scope (rtx, tree, tree);
 
 void verify_insn_chain (void);
@@ -231,106 +232,121 @@ record_effective_endpoints (void)
    than the following one.  Similarly for the other properties.  */
 static VEC(int,heap) *block_locators_locs;
 static GTY(()) VEC(tree,gc) *block_locators_blocks;
-static VEC(int,heap) *locations_locators_locs;
-DEF_VEC_O(location_t);
-DEF_VEC_ALLOC_O(location_t,heap);
-static VEC(location_t,heap) *locations_locators_vals;
+static VEC(int,heap) *line_locators_locs;
+static VEC(int,heap) *line_locators_lines;
+static VEC(int,heap) *file_locators_locs;
+static GTY(()) varray_type file_locators_files;
 int prologue_locator;
 int epilogue_locator;
 
-/* Hold current location information and last location information, so the
-   datastructures are built lazilly only when some instructions in given
-   place are needed.  */
-location_t curr_location, last_location;
-static tree curr_block, last_block;
-static int curr_rtl_loc = -1;
+/* During the RTL expansion the lexical blocks and line numbers are
+   represented via INSN_NOTEs.  Replace them by representation using
+   INSN_LOCATORs.  */
 
-/* Allocate insn locator datastructure.  */
-void
-insn_locators_alloc (void)
+unsigned int
+insn_locators_initialize (void)
 {
+  tree block = NULL;
+  tree last_block = NULL;
+  rtx insn, next;
+  int loc = 0;
+  int line_number = 0, last_line_number = 0;
+  const char *file_name = NULL, *last_file_name = NULL;
+
   prologue_locator = epilogue_locator = 0;
 
   block_locators_locs = VEC_alloc (int, heap, 32);
   block_locators_blocks = VEC_alloc (tree, gc, 32);
-  locations_locators_locs = VEC_alloc (int, heap, 32);
-  locations_locators_vals = VEC_alloc (location_t, heap, 32);
-
-#ifdef USE_MAPPED_LOCATION
-  last_location = -1;
-  curr_location = -1;
-#else
-  last_location.line = -1;
-  curr_location.line = -1;
-#endif
-  curr_block = NULL;
-  last_block = NULL;
-  curr_rtl_loc = 0;
-}
+  line_locators_locs = VEC_alloc (int, heap, 32);
+  line_locators_lines = VEC_alloc (int, heap, 32);
+  file_locators_locs = VEC_alloc (int, heap, 32);
+  VARRAY_CHAR_PTR_INIT (file_locators_files, 32, "file_locators_files");
 
-/* At the end of emit stage, clear current location.  */
-void
-insn_locators_finalize (void)
-{
-  if (curr_rtl_loc >= 0)
-    epilogue_locator = curr_insn_locator ();
-  curr_rtl_loc = -1;
-}
+  for (insn = get_insns (); insn; insn = next)
+    {
+      int active = 0;
 
-/* Set current location.  */
-void
-set_curr_insn_source_location (location_t location)
-{
-  gcc_assert (curr_rtl_loc >= 0);
-#ifdef USE_MAPPED_LOCATION
-  if (location == last_location)
-    return;
-#else
-  if (location.file && last_location.file
-      && !strcmp (location.file, last_location.file)
-      && location.line == last_location.line)
-    return;
-#endif
-  curr_location = location;
-}
+      next = NEXT_INSN (insn);
 
-/* Set current scope block. */
-void
-set_curr_insn_block (tree b)
-{
-  gcc_assert (curr_rtl_loc >= 0);
-  if (b)
-    curr_block = b;
-}
+      if (NOTE_P (insn))
+	{
+	  gcc_assert (NOTE_LINE_NUMBER (insn) != NOTE_INSN_BLOCK_BEG
+		      && NOTE_LINE_NUMBER (insn) != NOTE_INSN_BLOCK_END);
+	  if (NOTE_LINE_NUMBER (insn) > 0)
+	    {
+	      expanded_location xloc;
+	      NOTE_EXPANDED_LOCATION (xloc, insn);
+	      line_number = xloc.line;
+	      file_name = xloc.file;
+	      delete_insn (insn);
+	    }
+	}
+      else
+	active = (active_insn_p (insn)
+		  && GET_CODE (PATTERN (insn)) != ADDR_VEC
+		  && GET_CODE (PATTERN (insn)) != ADDR_DIFF_VEC);
 
-/* Return current insn locator.  */
-int
-curr_insn_locator (void)
-{
-  if (curr_rtl_loc == -1)
-    return 0;
-  if (last_block != curr_block)
-    {
-      curr_rtl_loc++;
-      VEC_safe_push (int, heap, block_locators_locs, curr_rtl_loc);
-      VEC_safe_push (tree, gc, block_locators_blocks, curr_block);
-      last_block = curr_block;
-    }
-#ifdef USE_MAPPED_LOCATION
-  if (last_location != curr_location)
-#else
-  if (last_location.file != curr_location.file
-      || last_location.line != curr_location.line)
-#endif
-    {
-      curr_rtl_loc++;
-      VEC_safe_push (int, heap, locations_locators_locs, curr_rtl_loc);
-      VEC_safe_push (location_t, heap, locations_locators_vals, &curr_location);
-      last_location = curr_location;
+      check_block_change (insn, &block);
+
+      if (active
+	  || !next
+	  || (!prologue_locator && file_name))
+	{
+	  if (last_block != block)
+	    {
+	      loc++;
+	      VEC_safe_push (int, heap, block_locators_locs, loc);
+	      VEC_safe_push (tree, gc, block_locators_blocks, block);
+	      last_block = block;
+	    }
+	  if (last_line_number != line_number)
+	    {
+	      loc++;
+	      VEC_safe_push (int, heap, line_locators_locs, loc);
+	      VEC_safe_push (int, heap, line_locators_lines, line_number);
+	      last_line_number = line_number;
+	    }
+	  if (last_file_name != file_name)
+	    {
+	      loc++;
+	      VEC_safe_push (int, heap, file_locators_locs, loc);
+	      VARRAY_PUSH_CHAR_PTR (file_locators_files, (char *) file_name);
+	      last_file_name = file_name;
+	    }
+	  if (!prologue_locator && file_name)
+	    prologue_locator = loc;
+	  if (!next)
+	    epilogue_locator = loc;
+	  if (active)
+	    INSN_LOCATOR (insn) = loc;
+	}
     }
-  return curr_rtl_loc;
+
+  /* Tag the blocks with a depth number so that change_scope can find
+     the common parent easily.  */
+  set_block_levels (DECL_INITIAL (cfun->decl), 0);
+
+  free_block_changes ();
+  return 0;
 }
 
+struct tree_opt_pass pass_insn_locators_initialize =
+{
+  "locators",                           /* name */
+  NULL,                                 /* gate */
+  insn_locators_initialize,             /* execute */
+  NULL,                                 /* sub */
+  NULL,                                 /* next */
+  0,                                    /* static_pass_number */
+  0,                                    /* tv_id */
+  0,                                    /* properties_required */
+  0,                                    /* properties_provided */
+  0,                                    /* properties_destroyed */
+  0,                                    /* todo_flags_start */
+  TODO_dump_func,                       /* todo_flags_finish */
+  0                                     /* letter */
+};
+
 static unsigned int
 into_cfg_layout_mode (void)
 {
@@ -385,6 +401,20 @@ struct tree_opt_pass pass_outof_cfg_layout_mode =
   TODO_dump_func,                       /* todo_flags_finish */
   0                                     /* letter */
 };
+
+/* For each lexical block, set BLOCK_NUMBER to the depth at which it is
+   found in the block tree.  */
+
+static void
+set_block_levels (tree block, int level)
+{
+  while (block)
+    {
+      BLOCK_NUMBER (block) = level;
+      set_block_levels (BLOCK_SUBBLOCKS (block), level + 1);
+      block = BLOCK_CHAIN (block);
+    }
+}
 
 /* Return sope resulting from combination of S1 and S2.  */
 static tree
@@ -484,16 +514,18 @@ insn_scope (rtx insn)
 }
 
 /* Return line number of the statement specified by the locator.  */
-static location_t
-locator_location (int loc)
+int
+locator_line (int loc)
 {
-  int max = VEC_length (int, locations_locators_locs);
+  int max = VEC_length (int, line_locators_locs);
   int min = 0;
 
+  if (!max || !loc)
+    return 0;
   while (1)
     {
       int pos = (min + max) / 2;
-      int tmp = VEC_index (int, locations_locators_locs, pos);
+      int tmp = VEC_index (int, line_locators_locs, pos);
 
       if (tmp <= loc && min != pos)
 	min = pos;
@@ -505,19 +537,7 @@ locator_location (int loc)
 	  break;
 	}
     }
-  return *VEC_index (location_t, locations_locators_vals, min);
-}
-
-/* Return source line of the statement that produced this insn.  */
-int
-locator_line (int loc)
-{
-  expanded_location xloc;
-  if (!loc)
-    return 0;
-  else
-    xloc = expand_location (locator_location (loc));
-  return xloc.line;
+  return VEC_index (int, line_locators_lines, min);
 }
 
 /* Return line number of the statement that produced this insn.  */
@@ -531,12 +551,27 @@ insn_line (rtx insn)
 const char *
 locator_file (int loc)
 {
-  expanded_location xloc;
-  if (!loc)
-    return 0;
-  else
-    xloc = expand_location (locator_location (loc));
-  return xloc.file;
+  int max = VEC_length (int, file_locators_locs);
+  int min = 0;
+
+  if (!max || !loc)
+    return NULL;
+  while (1)
+    {
+      int pos = (min + max) / 2;
+      int tmp = VEC_index (int, file_locators_locs, pos);
+
+      if (tmp <= loc && min != pos)
+	min = pos;
+      else if (tmp > loc && max != pos)
+	max = pos;
+      else
+	{
+	  min = pos;
+	  break;
+	}
+    }
+   return VARRAY_CHAR_PTR (file_locators_files, min);
 }
 
 /* Return source file of the statement that produced this insn.  */
diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index e816026..16fa6c5 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -3336,7 +3336,7 @@ make_insn_raw (rtx pattern)
   INSN_CODE (insn) = -1;
   LOG_LINKS (insn) = NULL;
   REG_NOTES (insn) = NULL;
-  INSN_LOCATOR (insn) = curr_insn_locator ();
+  INSN_LOCATOR (insn) = 0;
   BLOCK_FOR_INSN (insn) = NULL;
 
 #ifdef ENABLE_RTL_CHECKING
@@ -3369,7 +3369,7 @@ make_jump_insn_raw (rtx pattern)
   LOG_LINKS (insn) = NULL;
   REG_NOTES (insn) = NULL;
   JUMP_LABEL (insn) = NULL;
-  INSN_LOCATOR (insn) = curr_insn_locator ();
+  INSN_LOCATOR (insn) = 0;
   BLOCK_FOR_INSN (insn) = NULL;
 
   return insn;
@@ -3390,7 +3390,7 @@ make_call_insn_raw (rtx pattern)
   LOG_LINKS (insn) = NULL;
   REG_NOTES (insn) = NULL;
   CALL_INSN_FUNCTION_USAGE (insn) = NULL;
-  INSN_LOCATOR (insn) = curr_insn_locator ();
+  INSN_LOCATOR (insn) = 0;
   BLOCK_FOR_INSN (insn) = NULL;
 
   return insn;
@@ -4460,6 +4460,42 @@ emit_barrier (void)
   return barrier;
 }
 
+/* Make line numbering NOTE insn for LOCATION add it to the end
+   of the doubly-linked list, but only if line-numbers are desired for
+   debugging info and it doesn't match the previous one.  */
+
+rtx
+emit_line_note (location_t location)
+{
+  rtx note;
+  
+#ifdef USE_MAPPED_LOCATION
+  if (location == last_location)
+    return NULL_RTX;
+#else
+  if (location.file && last_location.file
+      && !strcmp (location.file, last_location.file)
+      && location.line == last_location.line)
+    return NULL_RTX;
+#endif
+  last_location = location;
+  
+  if (no_line_numbers)
+    {
+      cur_insn_uid++;
+      return NULL_RTX;
+    }
+
+#ifdef USE_MAPPED_LOCATION
+  note = emit_note ((int) location);
+#else
+  note = emit_note (location.line);
+  NOTE_SOURCE_FILE (note) = location.file;
+#endif
+  
+  return note;
+}
+
 /* Emit a copy of note ORIG.  */
 
 rtx
diff --git a/gcc/expr.c b/gcc/expr.c
index c8b211d..e239f4c6 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -6777,14 +6777,14 @@ expand_expr_real (tree exp, rtx target, enum machine_mode tmode,
      information.  It would be better of the diagnostic routines
      used the file/line information embedded in the tree nodes rather
      than globals.  */
-  if (cfun && EXPR_HAS_LOCATION (exp))
+  if (cfun && cfun->ib_boundaries_block && EXPR_HAS_LOCATION (exp))
     {
       location_t saved_location = input_location;
       input_location = EXPR_LOCATION (exp);
-      set_curr_insn_source_location (input_location);
+      emit_line_note (input_location);
 
       /* Record where the insns produced belong.  */
-      set_curr_insn_block (TREE_BLOCK (exp));
+      record_block_change (TREE_BLOCK (exp));
 
       ret = expand_expr_real_1 (exp, target, tmode, modifier, alt_rtl);
 
diff --git a/gcc/function.c b/gcc/function.c
index 7004793..f0a2dd6 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -3843,6 +3843,18 @@ init_function_start (tree subr)
 {
   prepare_function_start (subr);
 
+  /* Prevent ever trying to delete the first instruction of a
+     function.  Also tell final how to output a linenum before the
+     function prologue.  Note linenums could be missing, e.g. when
+     compiling a Java .class file.  */
+  if (! DECL_IS_BUILTIN (subr))
+    emit_line_note (DECL_SOURCE_LOCATION (subr));
+
+  /* Make sure first insn is a note even if we don't want linenums.
+     This makes sure the first insn will never be deleted.
+     Also, final expects a note to appear there.  */
+  emit_note (NOTE_INSN_DELETED);
+
   /* Warn if this value is an aggregate type,
      regardless of which calling convention we are using for it.  */
   if (AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr))))
@@ -4293,7 +4305,7 @@ expand_function_end (void)
   /* Output a linenumber for the end of the function.
      SDB depends on this.  */
   force_next_line_note ();
-  set_curr_insn_source_location (input_location);
+  emit_line_note (input_location);
 
   /* Before the return label (if any), clobber the return
      registers so that they are not propagated live to the rest of
@@ -5336,6 +5348,62 @@ reposition_prologue_and_epilogue_notes (rtx f ATTRIBUTE_UNUSED)
 #endif /* HAVE_prologue or HAVE_epilogue */
 }
 
+/* Resets insn_block_boundaries array.  */
+
+void
+reset_block_changes (void)
+{
+  cfun->ib_boundaries_block = VEC_alloc (tree, gc, 100);
+  VEC_quick_push (tree, cfun->ib_boundaries_block, NULL_TREE);
+}
+
+/* Record the boundary for BLOCK.  */
+void
+record_block_change (tree block)
+{
+  int i, n;
+  tree last_block;
+
+  if (!block)
+    return;
+
+  if(!cfun->ib_boundaries_block)
+    return;
+
+  last_block = VEC_pop (tree, cfun->ib_boundaries_block);
+  n = get_max_uid ();
+  for (i = VEC_length (tree, cfun->ib_boundaries_block); i < n; i++)
+    VEC_safe_push (tree, gc, cfun->ib_boundaries_block, last_block);
+
+  VEC_safe_push (tree, gc, cfun->ib_boundaries_block, block);
+}
+
+/* Finishes record of boundaries.  */
+void
+finalize_block_changes (void)
+{
+  record_block_change (DECL_INITIAL (current_function_decl));
+}
+
+/* For INSN return the BLOCK it belongs to.  */ 
+void
+check_block_change (rtx insn, tree *block)
+{
+  unsigned uid = INSN_UID (insn);
+
+  if (uid >= VEC_length (tree, cfun->ib_boundaries_block))
+    return;
+
+  *block = VEC_index (tree, cfun->ib_boundaries_block, uid);
+}
+
+/* Releases the ib_boundaries_block records.  */
+void
+free_block_changes (void)
+{
+  VEC_free (tree, gc, cfun->ib_boundaries_block);
+}
+
 /* Returns the name of the current function.  */
 const char *
 current_function_name (void)
diff --git a/gcc/function.h b/gcc/function.h
index a5afd1b..f176d85 100644
--- a/gcc/function.h
+++ b/gcc/function.h
@@ -347,6 +347,9 @@ struct function GTY(())
   /* Line number of the end of the function.  */
   location_t function_end_locus;
 
+  /* Array mapping insn uids to blocks.  */
+  VEC(tree,gc) *ib_boundaries_block;
+
   /* The variables unexpanded so far.  */
   tree unexpanded_var_list;
 
@@ -549,6 +552,11 @@ extern void number_blocks (tree);
 
 extern void clear_block_marks (tree);
 extern tree blocks_nreverse (tree);
+extern void reset_block_changes (void);
+extern void record_block_change (tree);
+extern void finalize_block_changes (void);
+extern void check_block_change (rtx, tree *);
+extern void free_block_changes (void);
 
 /* Return size needed for stack frame based on slots so far allocated.
    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
diff --git a/gcc/passes.c b/gcc/passes.c
index 9650e89..11b1198 100644
--- a/gcc/passes.c
+++ b/gcc/passes.c
@@ -654,6 +654,7 @@ init_optimization_passes (void)
       struct tree_opt_pass **p = &pass_rest_of_compilation.sub;
       NEXT_PASS (pass_init_function);
       NEXT_PASS (pass_jump);
+      NEXT_PASS (pass_insn_locators_initialize);
       NEXT_PASS (pass_rtl_eh);
       NEXT_PASS (pass_initial_value_sets);
       NEXT_PASS (pass_unshare_all_rtl);
diff --git a/gcc/rtl.h b/gcc/rtl.h
index 2ba7c8a..81ed8bc 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -1562,6 +1562,7 @@ extern rtx emit_label (rtx);
 extern rtx emit_barrier (void);
 extern rtx emit_note (int);
 extern rtx emit_note_copy (rtx);
+extern rtx emit_line_note (location_t);
 extern rtx make_insn_raw (rtx);
 extern rtx make_jump_insn_raw (rtx);
 extern void add_function_usage_to (rtx, rtx);
@@ -2297,10 +2298,4 @@ extern const struct rtl_hooks general_rtl_hooks;
 /* Keep this for the nonce.  */
 #define gen_lowpart rtl_hooks.gen_lowpart
 
-extern void insn_locators_alloc (void);
-extern void insn_locators_finalize (void);
-extern void set_curr_insn_source_location (location_t);
-extern void set_curr_insn_block (tree);
-extern int curr_insn_locator (void);
-
 #endif /* ! GCC_RTL_H */
diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index 3b47eff..ff76b75 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -1117,6 +1117,7 @@ initialize_cfun (tree new_fndecl, tree callee_fndecl, gcov_type count,
   new_cfun->unexpanded_var_list = NULL;
   new_cfun->cfg = NULL;
   new_cfun->decl = new_fndecl /*= copy_node (callee_fndecl)*/;
+  new_cfun->ib_boundaries_block = NULL;
   DECL_STRUCT_FUNCTION (new_fndecl) = new_cfun;
   push_cfun (new_cfun);
   init_empty_tree_cfg ();
diff --git a/gcc/tree-pass.h b/gcc/tree-pass.h
index cc686bb..1b92f8c 100644
--- a/gcc/tree-pass.h
+++ b/gcc/tree-pass.h
@@ -329,6 +329,7 @@ extern struct tree_opt_pass pass_fixup_cfg;
 
 extern struct tree_opt_pass pass_init_function;
 extern struct tree_opt_pass pass_jump;
+extern struct tree_opt_pass pass_insn_locators_initialize;
 extern struct tree_opt_pass pass_rtl_eh;
 extern struct tree_opt_pass pass_initial_value_sets;
 extern struct tree_opt_pass pass_unshare_all_rtl;