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In a couple functions (type_update_when_use_rtti_test and

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skip_type_update_when_not_use_rtti_test) the testcase assumes an
uninitialized object has a specific type. In particular, 'ptr' and
's'.

In reality the compiler is free to do what it wants with that
uninitialized variable, even initialize it beforehand with the future
assignment's value.  This is exactly what happens on some targets.

ptr should have type 'Base *', but it really has type 'Derived *'
because it is already initialized (earlier) by the compiler. The same
thing happens to 's'.

The following patch addresses this by explicitly initializing those
variables so the compiler doesn't optimize their assignments and GDB
can print their correct values.

2014-06-17  Luis Machado  <lgustavo@codesourcery.com>

	* gdb.mi/mi-var-rtti.cc (type_update_when_use_rtti_test):
	Initialize ptr and S explicitly.
	(skip_type_update_when_not_use_rtti_test): Likewise.
This commit is contained in:
Luis Machado 2014-06-17 10:42:23 +01:00
parent c8de034b6a
commit 70795c525e
2 changed files with 22 additions and 12 deletions
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6
gdb/testsuite/ChangeLog
View File

@ -1,3 +1,9 @@
2014-06-17 Luis Machado <lgustavo@codesourcery.com>
* gdb.mi/mi-var-rtti.cc (type_update_when_use_rtti_test):
Initialize ptr and S explicitly.
(skip_type_update_when_not_use_rtti_test): Likewise.
2014-06-16 Keith Seitz <keiths@redhat.com>
PR mi/15863

28
gdb/testsuite/gdb.mi/mi-var-rtti.cc
View File

@ -241,6 +241,12 @@ void use_rtti_with_multiple_inheritence_test ()
void type_update_when_use_rtti_test ()
{
/*: BEGIN: type_update_when_use_rtti :*/
Base *ptr = 0;
struct S {
Base* ptr;
S ( Base* v ) :
ptr ( v ) {}
} s ( ptr );
Derived d;
/*:
set testname type_update_when_use_rtti
@ -260,12 +266,8 @@ void type_update_when_use_rtti_test ()
check_derived_children_without_rtti S.public.ptr s.ptr $testname
:*/
Base* ptr = &d;
struct S {
Base* ptr;
S ( Base* v ) :
ptr ( v ) {}
} s ( &d );
ptr = &d;
s.ptr = &d;
/*:
mi_varobj_update_with_type_change PTR {Derived \*} 2 \
"update ptr to derived in $testname"
@ -295,6 +297,12 @@ void type_update_when_use_rtti_test ()
void skip_type_update_when_not_use_rtti_test ()
{
/*: BEGIN: skip_type_update_when_not_use_rtti :*/
Base *ptr = 0;
struct S {
Base* ptr;
S ( Base* v ) :
ptr ( v ) {}
} s ( ptr );
Derived d;
/*:
set testname skip_type_update_when_not_use_rtti
@ -314,12 +322,8 @@ void skip_type_update_when_not_use_rtti_test ()
check_derived_children_without_rtti S.public.ptr s.ptr $testname
:*/
Base* ptr = &d;
struct S {
Base* ptr;
S ( Base* v ) :
ptr ( v ) {}
} s ( &d );
ptr = &d;
s.ptr = &d;
/*:
mi_varobj_update PTR {PTR PTR.public.A} \
"update ptr to derived type in $testname"