re PR libstdc++/5625 ([mips] exception unwinding creates invalid pointer on mips)

PR libstdc++/5625
* builtin-types.def (BT_WORD, BT_FN_WORD_PTR): New.
* builtins.c (expand_builtin): Handle BUILT_IN_EXTEND_POINTER.
* builtins.def (BUILT_IN_EXTEND_POINTER): New.
* except.c (expand_builtin_extend_pointer): New.
* except.h (expand_builtin_extend_pointer): Declare.

From-SVN: r77554

gcc/ChangeLog

+2004-02-09  James E Wilson  <wilson@specifixinc.com>
+
+	PR libstdc++/5625
+	* builtin-types.def (BT_WORD, BT_FN_WORD_PTR): New.
+	* builtins.c (expand_builtin): Handle BUILT_IN_EXTEND_POINTER.
+	* builtins.def (BUILT_IN_EXTEND_POINTER): New.
+	* except.c (expand_builtin_extend_pointer): New.
+	* except.h (expand_builtin_extend_pointer): Declare.
+
 2004-02-09  David Edelsohn  <edelsohn@gnu.org>
 
 	* config/rs6000/rs6000.c (rs6000_emit_move): Remove splitting slow

gcc/builtin-types.def

@@ -64,6 +64,7 @@ DEF_PRIMITIVE_TYPE (BT_INT, integer_type_node)
 DEF_PRIMITIVE_TYPE (BT_UNSIGNED, unsigned_type_node)
 DEF_PRIMITIVE_TYPE (BT_LONG, long_integer_type_node)
 DEF_PRIMITIVE_TYPE (BT_LONGLONG, long_long_integer_type_node)
+DEF_PRIMITIVE_TYPE (BT_WORD, (*lang_hooks.types.type_for_mode) (word_mode, 0))
 DEF_PRIMITIVE_TYPE (BT_FLOAT, float_type_node)
 DEF_PRIMITIVE_TYPE (BT_INTMAX, intmax_type_node)
 DEF_PRIMITIVE_TYPE (BT_DOUBLE, double_type_node)
@@ -142,6 +143,7 @@ DEF_FUNCTION_TYPE_1 (BT_FN_DOUBLE_CONST_STRING, BT_DOUBLE, BT_CONST_STRING)
 DEF_FUNCTION_TYPE_1 (BT_FN_LONGDOUBLE_CONST_STRING,
 		     BT_LONGDOUBLE, BT_CONST_STRING)
 DEF_FUNCTION_TYPE_1 (BT_FN_STRING_CONST_STRING, BT_STRING, BT_CONST_STRING)
+DEF_FUNCTION_TYPE_1 (BT_FN_WORD_PTR, BT_WORD, BT_PTR)
 
 DEF_FUNCTION_TYPE_2 (BT_FN_VOID_PTR_INT, BT_VOID, BT_PTR, BT_INT)
 DEF_FUNCTION_TYPE_2 (BT_FN_STRING_STRING_CONST_STRING, 

gcc/builtins.c

@@ -5539,6 +5539,9 @@ expand_builtin (tree exp, rtx target, rtx subtarget, enum machine_mode mode,
     case BUILT_IN_EH_RETURN_DATA_REGNO:
       return expand_builtin_eh_return_data_regno (arglist);
 #endif
+    case BUILT_IN_EXTEND_POINTER:
+      return expand_builtin_extend_pointer (TREE_VALUE (arglist));
+
     case BUILT_IN_VA_START:
     case BUILT_IN_STDARG_START:
       return expand_builtin_va_start (arglist);

gcc/builtins.def

@@ -516,6 +516,7 @@ DEF_GCC_BUILTIN        (BUILT_IN_EH_RETURN, "eh_return", BT_FN_VOID_PTRMODE_PTR,
 DEF_GCC_BUILTIN        (BUILT_IN_EH_RETURN_DATA_REGNO, "eh_return_data_regno", BT_FN_INT_INT, ATTR_NULL)
 DEF_LIB_BUILTIN        (BUILT_IN_EXIT, "exit", BT_FN_VOID_INT, ATTR_NORETURN_NOTHROW_LIST)
 DEF_GCC_BUILTIN        (BUILT_IN_EXPECT, "expect", BT_FN_LONG_LONG_LONG, ATTR_NULL)
+DEF_GCC_BUILTIN        (BUILT_IN_EXTEND_POINTER, "extend_pointer", BT_FN_WORD_PTR, ATTR_CONST_NOTHROW_LIST)
 DEF_GCC_BUILTIN        (BUILT_IN_EXTRACT_RETURN_ADDR, "extract_return_addr", BT_FN_PTR_PTR, ATTR_NULL)
 DEF_GCC_BUILTIN        (BUILT_IN_FRAME_ADDRESS, "frame_address", BT_FN_PTR_UNSIGNED, ATTR_NULL)
 DEF_GCC_BUILTIN        (BUILT_IN_FROB_RETURN_ADDR, "frob_return_addr", BT_FN_PTR_PTR, ATTR_NULL)

gcc/except.c

@@ -3076,6 +3076,26 @@ expand_eh_return (void)
 
   emit_label (around_label);
 }
+
+/* Convert a ptr_mode address ADDR_TREE to a Pmode address controlled by
+   POINTERS_EXTEND_UNSIGNED and return it.  */
+
+rtx
+expand_builtin_extend_pointer (tree addr_tree)
+{
+  rtx addr = expand_expr (addr_tree, NULL_RTX, ptr_mode, 0);
+  int extend;
+
+#ifdef POINTERS_EXTEND_UNSIGNED
+  extend = POINTERS_EXTEND_UNSIGNED;
+#else
+  /* The previous EH code did an unsigned extend by default, so we do this also
+     for consistency.  */
+  extend = 1;
+#endif
+
+  return convert_modes (word_mode, ptr_mode, addr, extend);
+}
 
 /* In the following functions, we represent entries in the action table
    as 1-based indices.  Special cases are:

gcc/except.h

@@ -117,6 +117,7 @@ extern rtx expand_builtin_frob_return_addr (tree);
 extern rtx expand_builtin_dwarf_sp_column (void);
 extern void expand_builtin_eh_return (tree, tree);
 extern void expand_eh_return (void);
+extern rtx expand_builtin_extend_pointer (tree);
 extern rtx get_exception_pointer (struct function *);
 extern int duplicate_eh_regions (struct function *, struct inline_remap *);