Update new test after merge.

1 files changed, 139 insertions, 0 deletions

diff --git a/backends/i386_retval.c b/backends/i386_retval.c
new file mode 100644
index 00000000..34cae064
--- /dev/null
+++ b/backends/i386_retval.c
@@ -0,0 +1,139 @@
+/* Function return value location for Linux/i386 ABI.
+   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 <assert.h>
+#include <dwarf.h>
+
+#define BACKEND i386_
+#include "libebl_CPU.h"
+
+
+/* %eax, or pair %eax, %edx.  */
+static const Dwarf_Op loc_intreg[] =
+  {
+    { .atom = DW_OP_reg0 }, { .atom = DW_OP_piece, .number = 4 },
+    { .atom = DW_OP_reg1 }, { .atom = DW_OP_piece, .number = 4 },
+  };
+#define nloc_intreg	1
+#define nloc_intregpair	4
+
+/* %st(0).  */
+static const Dwarf_Op loc_fpreg[] =
+  {
+    { .atom = DW_OP_reg11 }
+  };
+#define nloc_fpreg	1
+
+/* The return value is a structure and is actually stored in stack space
+   passed in a hidden argument by the caller.  But, the compiler
+   helpfully returns the address of that space in %eax.  */
+static const Dwarf_Op loc_aggregate[] =
+  {
+    { .atom = DW_OP_breg0, .number = 0 }
+  };
+#define nloc_aggregate 1
+
+int
+i386_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
+{
+  /* Start with the function's type, and get the DW_AT_type attribute,
+     which is the type of the return value.  */
+
+  Dwarf_Attribute attr_mem;
+  Dwarf_Attribute *attr = dwarf_attr (functypedie, DW_AT_type, &attr_mem);
+  if (attr == NULL)
+    /* The function has no return value, like a `void' function in C.  */
+    return 0;
+
+  Dwarf_Die die_mem;
+  Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
+  int tag = dwarf_tag (typedie);
+
+  /* Follow typedefs and qualifiers to get to the actual type.  */
+  while (tag == DW_TAG_typedef
+	 || tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
+	 || tag == DW_TAG_restrict_type || tag == DW_TAG_mutable_type)
+    {
+      attr = dwarf_attr (typedie, DW_AT_type, &attr_mem);
+      typedie = dwarf_formref_die (attr, &die_mem);
+      tag = dwarf_tag (typedie);
+    }
+
+  switch (tag)
+    {
+    case -1:
+      return -1;
+
+    case DW_TAG_subrange_type:
+      if (! dwarf_hasattr (typedie, DW_AT_byte_size))
+	{
+	  attr = dwarf_attr (typedie, DW_AT_type, &attr_mem);
+	  typedie = dwarf_formref_die (attr, &die_mem);
+	  tag = dwarf_tag (typedie);
+	}
+      /* Fall through.  */
+
+    case DW_TAG_base_type:
+    case DW_TAG_enumeration_type:
+    case DW_TAG_pointer_type:
+    case DW_TAG_ptr_to_member_type:
+      {
+	Dwarf_Word size;
+	if (dwarf_formudata (dwarf_attr (typedie, DW_AT_byte_size,
+					 &attr_mem), &size) != 0)
+	  {
+	    if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
+	      size = 4;
+	    else
+	      return -1;
+	  }
+	if (tag == DW_TAG_base_type)
+	  {
+	    Dwarf_Word encoding;
+	    if (dwarf_formudata (dwarf_attr (typedie, DW_AT_encoding,
+					     &attr_mem), &encoding) != 0)
+	      return -1;
+	    if (encoding == DW_ATE_float)
+	      {
+		if (size > 16)
+		  return -2;
+		*locp = loc_fpreg;
+		return nloc_fpreg;
+	      }
+	  }
+	*locp = loc_intreg;
+	if (size <= 4)
+	  return nloc_intreg;
+	if (size <= 8)
+	  return nloc_intregpair;
+
+	/* Else fall through.  */
+      }
+
+    case DW_TAG_structure_type:
+    case DW_TAG_class_type:
+    case DW_TAG_union_type:
+    case DW_TAG_array_type:
+      *locp = loc_aggregate;
+      return nloc_aggregate;
+    }
+
+  /* XXX We don't have a good way to return specific errors from ebl calls.
+     This value means we do not understand the type, but it is well-formed
+     DWARF and might be valid.  */
+  return -2;
+}