X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Ftr%2Ftype.c;h=9a933dc066989a40a963e2c650eeb8b8b14743f6;hb=6ac253f762d463c9444bbb392fc8cdb480127895;hp=fe70d4dfd939935ba38ea98b0129988e6694fabd;hpb=2eef4468e02e351bae78e54edf578fd449b0c7c6;p=libfirm

diff --git a/ir/tr/type.c b/ir/tr/type.c
index fe70d4dfd..9a933dc06 100644
--- a/ir/tr/type.c
+++ b/ir/tr/type.c
@@ -361,6 +361,7 @@ int get_type_alignment_bits(ir_type *tp) {
 void
 set_type_alignment_bits(ir_type *tp, int align) {
   assert(tp && tp->kind == k_type);
+  assert((align & (align - 1)) == 0 && "type alignment not power of two");
   /* Methods don't have an alignment. */
   if (tp->type_op != type_method) {
     tp->align = align;
@@ -1783,8 +1784,8 @@ void set_pointer_mode(ir_type *tp, ir_mode *mode) {
  *  Not efficient: O(#types).
  *  If not found returns firm_unknown_type. */
 ir_type *find_pointer_type_to_type (ir_type *tp) {
-  int i;
-  for (i = 0; i < get_irp_n_types(); ++i) {
+  int i, n = get_irp_n_types();
+  for (i = 0; i < n; ++i) {
     ir_type *found = get_irp_type(i);
     if (is_Pointer_type(found) && get_pointer_points_to_type(found) == tp)
       return (found);
@@ -1930,3 +1931,60 @@ ir_type *get_associated_type(const ir_type *tp) {
 void set_default_size_bits(ir_type *tp, int size) {
   tp->size = size;
 }
+
+/*
+ * Allocate an area of size bytes aligned at alignment
+ * at the start or the end of a frame type.
+ * The frame type must have already an fixed layout.
+ */
+entity *frame_alloc_area(type *frame_type, int size, int alignment, int at_start)
+{
+  entity *area;
+  ir_type *tp;
+  ident *name;
+  char buf[32];
+  int frame_align, i, offset, frame_size;
+  static unsigned area_cnt = 0;
+  static ir_type *a_byte = NULL;
+
+  assert(is_frame_type(frame_type));
+  assert(get_type_state(frame_type) == layout_fixed);
+
+  if (! a_byte)
+    a_byte = new_type_primitive(new_id_from_chars("byte", 4), mode_Bu);
+
+  snprintf(buf, sizeof(buf), "area%u", area_cnt++);
+  name = new_id_from_str(buf);
+
+  /* align the size */
+  frame_align = get_type_alignment_bytes(frame_type);
+  size = (size + frame_align - 1) & -frame_align;
+
+  tp = new_type_array(mangle_u(get_type_ident(frame_type), name), 1, a_byte);
+  set_array_bounds_int(tp, 0, 0, size);
+  set_type_alignment_bytes(tp, alignment);
+
+  frame_size = get_type_size_bytes(frame_type);
+  if (at_start) {
+    /* fix all offsets so far */
+    for (i = get_class_n_members(frame_type) - 1; i >= 0; --i) {
+      entity *ent = get_class_member(frame_type, i);
+
+      set_entity_offset_bytes(ent, get_entity_offset_bytes(ent) + size);
+    }
+    /* calculate offset and new type size */
+    offset = 0;
+    frame_size += size;
+  }
+  else {
+    /* calculate offset and new type size */
+    offset = (frame_size + alignment - 1) & -alignment;
+    frame_size = offset + size;
+  }
+
+  area = new_entity(frame_type, name, tp);
+  set_entity_offset_bytes(area, offset);
+  set_type_size_bytes(frame_type, frame_size);
+
+  return area;
+}