1 files changed, 57 insertions, 0 deletions

diff --git a/gcc/tree-iterator.h b/gcc/tree-iterator.h
index 98f0cf8..5b8113a 100644
--- a/gcc/tree-iterator.h
+++ b/gcc/tree-iterator.h
@@ -34,6 +34,11 @@ typedef struct {
   tree container;
 } tree_stmt_iterator;
 
+typedef struct {
+  struct tree_statement_list_node *ptr;
+  const_tree container;
+} const_tree_stmt_iterator;
+
 static inline tree_stmt_iterator
 tsi_start (tree t)
 {
@@ -45,6 +50,17 @@ tsi_start (tree t)
   return i;
 }
 
+static inline const_tree_stmt_iterator
+ctsi_start (const_tree t)
+{
+  const_tree_stmt_iterator i;
+
+  i.ptr = STATEMENT_LIST_HEAD (t);
+  i.container = t;
+
+  return i;
+}
+
 static inline tree_stmt_iterator
 tsi_last (tree t)
 {
@@ -56,6 +72,17 @@ tsi_last (tree t)
   return i;
 }
 
+static inline const_tree_stmt_iterator
+ctsi_last (tree t)
+{
+  const_tree_stmt_iterator i;
+
+  i.ptr = STATEMENT_LIST_TAIL (t);
+  i.container = t;
+
+  return i;
+}
+
 static inline bool
 tsi_end_p (tree_stmt_iterator i)
 {
@@ -63,11 +90,23 @@ tsi_end_p (tree_stmt_iterator i)
 }
 
 static inline bool
+ctsi_end_p (const_tree_stmt_iterator i)
+{
+  return i.ptr == NULL;
+}
+
+static inline bool
 tsi_one_before_end_p (tree_stmt_iterator i)
 {
   return i.ptr != NULL && i.ptr->next == NULL;
 }
 
+static inline bool
+ctsi_one_before_end_p (const_tree_stmt_iterator i)
+{
+  return i.ptr != NULL && i.ptr->next == NULL;
+}
+
 static inline void
 tsi_next (tree_stmt_iterator *i)
 {
@@ -75,11 +114,23 @@ tsi_next (tree_stmt_iterator *i)
 }
 
 static inline void
+ctsi_next (const_tree_stmt_iterator *i)
+{
+  i->ptr = i->ptr->next;
+}
+
+static inline void
 tsi_prev (tree_stmt_iterator *i)
 {
   i->ptr = i->ptr->prev;
 }
 
+static inline void
+ctsi_prev (const_tree_stmt_iterator *i)
+{
+  i->ptr = i->ptr->prev;
+}
+
 static inline tree *
 tsi_stmt_ptr (tree_stmt_iterator i)
 {
@@ -92,6 +143,12 @@ tsi_stmt (tree_stmt_iterator i)
   return i.ptr->stmt;
 }
 
+static inline const_tree
+ctsi_stmt (const_tree_stmt_iterator i)
+{
+  return i.ptr->stmt;
+}
+
 enum tsi_iterator_update
 {
   TSI_NEW_STMT,		/* Only valid when single statement is added, move