auto import from //depot/cupcake/@135843

1 files changed, 114 insertions, 0 deletions

diff --git a/libdw/dwarf_getmacros.c b/libdw/dwarf_getmacros.c
new file mode 100644
index 00000000..f6f933aa
--- /dev/null
+++ b/libdw/dwarf_getmacros.c
@@ -0,0 +1,114 @@
+/* Get public symbol information.
+   Copyright (C) 2002, 2003, 2004 Red Hat, Inc.
+   Written by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   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 <string.h>
+
+#include <libdwP.h>
+
+
+ptrdiff_t
+dwarf_getmacros (die, callback, arg, offset)
+     Dwarf_Die *die;
+     int (*callback) (Dwarf_Macro *, void *);
+     void *arg;
+     ptrdiff_t offset;
+{
+  /* Get the appropriate attribute.  */
+  Dwarf_Attribute attr;
+  if (dwarf_attr (die, DW_AT_macro_info, &attr) == NULL)
+    return -1;
+
+  /* Offset into the .debug_macinfo section.  */
+  Dwarf_Word macoff;
+  if (dwarf_formudata (&attr, &macoff) != 0)
+    return -1;
+
+  const unsigned char *readp
+    = die->cu->dbg->sectiondata[IDX_debug_macinfo]->d_buf + offset;
+  const unsigned char *readendp
+    = readp + die->cu->dbg->sectiondata[IDX_debug_macinfo]->d_size;
+
+  if (readp == readendp)
+    return 0;
+
+  if (*readp != DW_MACINFO_start_file)
+    goto invalid;
+
+  while (readp < readendp)
+    {
+      unsigned int opcode = *readp++;
+      unsigned int u128;
+      unsigned int u128_2 = 0;
+      const char *str = NULL;
+      const unsigned char *endp;
+
+      switch (opcode)
+	{
+	case DW_MACINFO_define:
+	case DW_MACINFO_undef:
+	case DW_MACINFO_vendor_ext:
+	  /*  For the first two opcodes the parameters are
+	        line, string
+	      For the latter
+	        number, string.
+	      We can treat these cases together.  */
+	  get_uleb128 (u128, readp);
+
+	  endp = memchr (readp, '\0', readendp - readp);
+	  if (endp == NULL)
+	    goto invalid;
+
+	  str = (char *) readp;
+	  readp = endp + 1;
+	  break;
+
+	case DW_MACINFO_start_file:
+	  /* The two parameters are line and file index.  */
+	  get_uleb128 (u128, readp);
+	  get_uleb128 (u128_2, readp);
+	  break;
+
+	case DW_MACINFO_end_file:
+	  /* Nothing more to do.  */
+	  return 0;
+
+	default:
+	  goto invalid;
+	}
+
+      Dwarf_Macro mac;
+      mac.opcode = opcode;
+      mac.param1 = u128;
+      if (str == NULL)
+	mac.param2.u = u128_2;
+      else
+	mac.param2.s = str;
+
+      if (callback (&mac, arg) != DWARF_CB_OK)
+	return (readp
+		- ((unsigned char *) die->cu->dbg->sectiondata[IDX_debug_macinfo]->d_buf
+		   + offset));
+    }
+
+  /* If we come here the termination of the data for the CU is not
+     present.  */
+ invalid:
+  __libdw_seterrno (DWARF_E_INVALID_DWARF);
+  return -1;
+}