Re: [PATCH] Guard a call to TYPE_TARGET_TYPE in gnuv3_pass_by_reference

[Siva Chandra <sivachandra@google.com>]

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The patch updated with a test case is attached.

gdb/ChangeLog:

        * gnu-v3-abi.c (gnuv3_pass_by_reference): Call TYPE_TARGET_TYPE
        on the arg type of a constructor only if it is of reference type.

gdb/testsuite/ChangeLog:

        * gdb.cp/non-trivial-retval.cc: Add a test case.
        * gdb.cp/non-trivial-retval.exp: Add a test.

[-- Attachment #2: gnuv3_pass_by_reference_v2.txt --]
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diff --git a/gdb/gnu-v3-abi.c b/gdb/gnu-v3-abi.c
index a6c6f9f..b960aa3 100644
--- a/gdb/gnu-v3-abi.c
+++ b/gdb/gnu-v3-abi.c
@@ -1320,13 +1320,15 @@ gnuv3_pass_by_reference (struct type *type)
 	if (TYPE_NFIELDS (fieldtype) == 2)
 	  {
 	    struct type *arg_type = TYPE_FIELD_TYPE (fieldtype, 1);
-	    struct type *arg_target_type;
 
-	    arg_target_type = check_typedef (TYPE_TARGET_TYPE (arg_type));
+	    if (TYPE_CODE (arg_type) == TYPE_CODE_REF)
+	      {
+		struct type *arg_target_type;
 
-	    if (TYPE_CODE (arg_type) == TYPE_CODE_REF
-		&& class_types_same_p (arg_target_type, type))
-	      return 1;
+	        arg_target_type = check_typedef (TYPE_TARGET_TYPE (arg_type));
+		if (class_types_same_p (arg_target_type, type))
+		  return 1;
+	      }
 	  }
       }
 
diff --git a/gdb/testsuite/gdb.cp/non-trivial-retval.cc b/gdb/testsuite/gdb.cp/non-trivial-retval.cc
index 8382f40..aeb7875 100644
--- a/gdb/testsuite/gdb.cp/non-trivial-retval.cc
+++ b/gdb/testsuite/gdb.cp/non-trivial-retval.cc
@@ -63,6 +63,33 @@ f2 (int i1, int i2)
   return b;
 }
 
+class B1
+{
+public:
+  B1 () {}
+  B1 (int i);  /* Put this decl before the copy-ctor decl.  */
+  B1 (const B1 &obj);
+
+  int b1;
+};
+
+B1::B1 (const B1 &obj)
+{
+  b1 = obj.b1;
+}
+
+B1::B1 (int i) : b1 (i) { }
+
+B1
+f22 (int i1, int i2)
+{
+  B1 b1;
+
+  b1.b1 = i1 + i2;
+
+  return b1;
+}
+
 class C
 {
 public:
diff --git a/gdb/testsuite/gdb.cp/non-trivial-retval.exp b/gdb/testsuite/gdb.cp/non-trivial-retval.exp
index 7934946..3450a94 100644
--- a/gdb/testsuite/gdb.cp/non-trivial-retval.exp
+++ b/gdb/testsuite/gdb.cp/non-trivial-retval.exp
@@ -32,5 +32,6 @@ gdb_continue_to_breakpoint "Break here"
 
 gdb_test "p f1 (i1, i2)" ".* = {a = 123}" "p f1 (i1, i2)"
 gdb_test "p f2 (i1, i2)" ".* = {b = 123}" "p f2 (i1, i2)"
+gdb_test "p f22 (i1, i2)" ".* = {b1 = 123}" "p f22 (i1, i2)"
 gdb_test "p f3 (i1, i2)" ".* = {.* c = 123}" "p f3 (i1, i2)"
 gdb_test "p f4 (i1, i2)" ".* = {.* e = 123}" "p f4 (i1, i2)"