1 files changed, 105 insertions, 0 deletions
diff --git a/libdw/dwarf_haspc.c b/libdw/dwarf_haspc.c
new file mode 100644
index 00000000..7f29296d
--- /dev/null
+++ b/libdw/dwarf_haspc.c
@@ -0,0 +1,105 @@
+/* Determine whether a DIE covers a PC address.
+   Copyright (C) 2005 Red Hat, Inc.
+
+   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 "libdwP.h"
+#include <dwarf.h>
+
+
+int
+dwarf_haspc (Dwarf_Die *die, Dwarf_Addr pc)
+{
+  if (die == NULL)
+    return -1;
+
+  /* Usually there is a single contiguous range.  */
+  Dwarf_Addr lowpc, highpc;
+  if (INTUSE(dwarf_highpc) (die, &highpc) == 0
+      && INTUSE(dwarf_lowpc) (die, &lowpc) == 0)
+    return pc >= lowpc && pc < highpc;
+
+  /* We have to look for a noncontiguous range.  */
+  Dwarf_Attribute attr_mem;
+  Dwarf_Attribute *attr = INTUSE(dwarf_attr) (die, DW_AT_ranges, &attr_mem);
+  if (attr == NULL)
+    return -1;
+
+  /* Must have the form data4 or data8 which act as an offset.  */
+  Dwarf_Word offset;
+  if (INTUSE(dwarf_formudata) (attr, &offset) != 0)
+    return -1;
+
+  const Elf_Data *d = attr->cu->dbg->sectiondata[IDX_debug_ranges];
+  if (d == NULL)
+    {
+      __libdw_seterrno (DWARF_E_NO_DEBUG_RANGES);
+      return -1;
+    }
+
+  /* Fetch the CU's base address.  */
+  Dwarf_Addr base;
+  Dwarf_Die cudie =
+    {
+      .cu = attr->cu,
+      .addr = ((char *) attr->cu->dbg->sectiondata[IDX_debug_info]->d_buf
+	       + attr->cu->start + 3 * attr->cu->offset_size - 4 + 3),
+    };
+  if (INTUSE(dwarf_lowpc) (&cudie, &base) != 0)
+    return -1;
+
+  unsigned char *readp = d->d_buf + offset;
+  Dwarf_Addr begin;
+  Dwarf_Addr end;
+  do
+    {
+    next:
+      if ((unsigned char *) d->d_buf + d->d_size - readp
+	  < attr->cu->address_size * 2)
+	{
+	  __libdw_seterrno (DWARF_E_INVALID_DWARF);
+	  return -1;
+	}
+
+      if (attr->cu->address_size == 8)
+	{
+	  begin = read_8ubyte_unaligned_inc (attr->cu->dbg, readp);
+	  end = read_8ubyte_unaligned_inc (attr->cu->dbg, readp);
+	}
+      else
+	{
+	  begin = (Dwarf_Sword) read_4sbyte_unaligned_inc (attr->cu->dbg,
+							   readp);
+	  end = read_4ubyte_unaligned_inc (attr->cu->dbg, readp);
+	}
+
+      if (begin == (Dwarf_Addr) -1l) /* Base address entry.  */
+	{
+	  base = end;
+	  goto next;
+	}
+
+      if (begin == 0 && end == 0) /* End of list entry.  */
+	/* This is not the droid you are looking for.  */
+	return 0;
+
+      /* We have an address range entry.  */
+    }
+  while (pc < base + begin || pc >= base + end);
+
+  /* This one matches the address.  */
+  return 1;
+}
+INTDEF (dwarf_haspc)