From: Eric Botcazou <ebotcazou@adacore.com>
Date: Mon, 16 May 2022 08:44:09 +0000 (+0200)
Subject: Do not use DW_OP_not for TRUTH_NOT_EXPR in conditional expressions
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ad05a1d7f83aa7ddff9ac6ec5ca65e69042d6907;p=test_jj.git

Do not use DW_OP_not for TRUTH_NOT_EXPR in conditional expressions

DW_OP_not is a bitwise, not a logical NOT, so it computes the wrong result
in a DWARF conditional expression.

gcc/
	* dwarf2out.cc (loc_list_from_tree_1) <TRUTH_NOT_EXPR>: Do a logical
	instead of a bitwise negation.
	<COND_EXPR>: Swap the operands if the condition is TRUTH_NOT_EXPR.
---

diff --git a/gcc/dwarf2out.cc b/gcc/dwarf2out.cc
index 5681b01..c333c59 100644
--- a/gcc/dwarf2out.cc
+++ b/gcc/dwarf2out.cc
@@ -19449,6 +19449,14 @@ loc_list_from_tree_1 (tree loc, int want_address,
       break;
 
     case TRUTH_NOT_EXPR:
+      list_ret = loc_list_from_tree_1 (TREE_OPERAND (loc, 0), 0, context);
+      if (list_ret == 0)
+	return 0;
+
+      add_loc_descr_to_each (list_ret, new_loc_descr (DW_OP_lit0, 0, 0));
+      add_loc_descr_to_each (list_ret, new_loc_descr (DW_OP_eq, 0, 0));
+      break;
+
     case BIT_NOT_EXPR:
       op = DW_OP_not;
       goto do_unop;
@@ -19497,6 +19505,15 @@ loc_list_from_tree_1 (tree loc, int want_address,
 	  list_ret
 	    = loc_list_from_tree_1 (TREE_OPERAND (TREE_OPERAND (loc, 0), 0),
 				    0, context);
+	/* Likewise, swap the operands for a logically negated condition.  */
+	else if (TREE_CODE (TREE_OPERAND (loc, 0)) == TRUTH_NOT_EXPR)
+	  {
+	    lhs = loc_descriptor_from_tree (TREE_OPERAND (loc, 2), 0, context);
+	    rhs = loc_list_from_tree_1 (TREE_OPERAND (loc, 1), 0, context);
+	    list_ret
+	      = loc_list_from_tree_1 (TREE_OPERAND (TREE_OPERAND (loc, 0), 0),
+				      0, context);
+	  }
 	else
 	  list_ret = loc_list_from_tree_1 (TREE_OPERAND (loc, 0), 0, context);
 	if (list_ret == 0 || lhs == 0 || rhs == 0)