Adjust for monotone.

1 files changed, 125 insertions, 0 deletions

diff --git a/libdwarf/dwarf_getconstant.c b/libdwarf/dwarf_getconstant.c
new file mode 100644
index 00000000..39727f8a
--- /dev/null
+++ b/libdwarf/dwarf_getconstant.c
@@ -0,0 +1,125 @@
+/* Return constant value of given attribute type associated with die.
+   Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
+   Written by Ulrich Drepper <[email protected]>, 2000.
+
+   This program is Open Source software; you can redistribute it and/or
+   modify it under the terms of the Open Software License version 1.0 as
+   published by the Open Source Initiative.
+
+   You should have received a copy of the Open Software License along
+   with this program; if not, you may obtain a copy of the Open Software
+   License version 1.0 from http://www.opensource.org/licenses/osl.php or
+   by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
+   3001 King Ranch Road, Ukiah, CA 95482.   */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <dwarf.h>
+
+#include <libdwarfP.h>
+
+
+int
+__libdwarf_getconstant (die, name, return_size, error)
+     Dwarf_Die die;
+     Dwarf_Half name;
+     Dwarf_Unsigned *return_size;
+     Dwarf_Error *error;
+{
+  Dwarf_Debug dbg = die->cu->dbg;
+  Dwarf_Small *die_addr;
+  Dwarf_Word u128;
+  Dwarf_Abbrev abbrev;
+  Dwarf_Small *attrp;
+
+  /* Address of the given die.  */
+  die_addr = die->addr;
+
+  /* Get abbrev code.  */
+  get_uleb128 (u128, die_addr);
+  /*  And get the abbreviation itself.  */
+  abbrev = __libdwarf_get_abbrev (dbg, die->cu, u128, error);
+  if (abbrev == NULL)
+    return DW_DLV_ERROR;
+
+  /* This is where the attributes start.  */
+  attrp = abbrev->attrp;
+
+  /* Search the name attribute.  */
+  while (1)
+    {
+      Dwarf_Word attr_name;
+      Dwarf_Word attr_form;
+
+      /* Are we still in bounds?  */
+      if (unlikely (attrp
+		    >= ((Dwarf_Small *) dbg->sections[IDX_debug_abbrev].addr
+			+ dbg->sections[IDX_debug_abbrev].size)))
+	{
+	  __libdwarf_error (dbg, error, DW_E_INVALID_DWARF);
+	  return DW_DLV_ERROR;
+	}
+
+      /* Get attribute name and form.
+
+	 XXX We don't check whether this reads beyond the end of the
+	 section.  */
+      get_uleb128 (attr_name, attrp);
+      get_uleb128 (attr_form, attrp);
+
+      /* We can stop if we found the attribute with value zero.  */
+      if (attr_name == 0 && attr_form == 0)
+	break;
+
+      /* Is this the name attribute?  */
+      if (unlikely (attr_name == name))
+	{
+	  switch (attr_form)
+	    {
+	    case DW_FORM_data1:
+	      *return_size = *die_addr;
+	      break;
+	    case DW_FORM_data2:
+	      *return_size = read_2ubyte_unaligned (dbg, die_addr);
+	      break;
+	    case DW_FORM_data4:
+	      *return_size = read_4ubyte_unaligned (dbg, die_addr);
+	      break;
+	    case DW_FORM_data8:
+	      *return_size = read_8ubyte_unaligned (dbg, die_addr);
+	      break;
+	    case DW_FORM_sdata:
+	      get_sleb128 (u128, die_addr);
+	      *return_size = u128;
+	      break;
+	    case DW_FORM_udata:
+	      get_uleb128 (u128, die_addr);
+	      *return_size = u128;
+	      break;
+	    default:
+	      __libdwarf_error (dbg, error, DW_E_NO_CONSTANT);
+	      return DW_DLV_ERROR;
+	    }
+
+	  return DW_DLV_OK;
+	}
+
+      /* Skip over the rest of this attribute (if there is any).  */
+      if (attr_form != 0)
+	{
+	  size_t len;
+
+	  if (unlikely (__libdwarf_form_val_len (dbg, die->cu, attr_form,
+						 die_addr, &len, error)
+			!= DW_DLV_OK))
+	    return DW_DLV_ERROR;
+
+	  die_addr += len;
+	}
+    }
+
+  /* No such attribute present.  */
+  return DW_DLV_NO_ENTRY;
+}