diff options
Diffstat (limited to 'gdb')
| -rw-r--r-- | gdb/testsuite/ChangeLog | 4 | ||||
| -rw-r--r-- | gdb/testsuite/gdb.c++/casts.cc | 20 | ||||
| -rw-r--r-- | gdb/testsuite/gdb.c++/casts.exp | 80 |
3 files changed, 104 insertions, 0 deletions
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index 052d5ad..5ca0309 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,7 @@ +2002-10-02 Jim Blandy <jimb@redhat.com> + + * gdb.c++/casts.cc, gdb.c++/casts.exp: New test. + 2002-10-01 Andrew Cagney <ac131313@redhat.com> * mi1-basics.exp: Copy of mi1-basics.exp MIFLAGS set "-i=mi1". diff --git a/gdb/testsuite/gdb.c++/casts.cc b/gdb/testsuite/gdb.c++/casts.cc new file mode 100644 index 0000000..831add9 --- /dev/null +++ b/gdb/testsuite/gdb.c++/casts.cc @@ -0,0 +1,20 @@ +struct A +{ + int a; + A (int aa): a (aa) {} +}; + +struct B: public A +{ + int b; + B (int aa, int bb): A (aa), b(bb) {} +}; + +int +main (int argc, char **argv) +{ + A *a = new B(42, 1729); + B *b = (B *) a; + + return 0; /* breakpoint spot: casts.exp: 1 */ +} diff --git a/gdb/testsuite/gdb.c++/casts.exp b/gdb/testsuite/gdb.c++/casts.exp new file mode 100644 index 0000000..68ce704 --- /dev/null +++ b/gdb/testsuite/gdb.c++/casts.exp @@ -0,0 +1,80 @@ +# Copyright 2002 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +# Please email any bugs, comments, and/or additions to this file to: +# bug-gdb@prep.ai.mit.edu + +# This file is part of the gdb testsuite + +# Test casting, especially between class types or pointer-to-class +# types. + +# This file is part of the gdb testsuite + +if $tracelevel then { + strace $tracelevel + } + +# +# test running programs +# + +set prms_id 0 +set bug_id 0 + +if { [skip_cplus_tests] } { continue } + +set testfile "casts" +set srcfile ${testfile}.cc +set binfile ${objdir}/${subdir}/${testfile} + +if [get_compiler_info ${binfile} "c++"] { + return -1; +} + +if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } { + gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail." +} + + +gdb_exit +gdb_start +gdb_reinitialize_dir $srcdir/$subdir +gdb_load ${binfile} + +gdb_test "break [gdb_get_line_number "casts.exp: 1"]" \ + "Breakpoint.*at.* file .*" \ + "" + +gdb_test "run" "Breakpoint .* at casts.cc" "" + +# Casting a pointer to a base class to a pointer to a derived class +# should yield the entire derived class. Until August 2002, GDB got +# the enclosing type on `(B *) a' wrong: while the value's static type +# was `B *', as it should be, the enclosing type (which is supposed to +# be the dynamic type) was `A *'. It's senseless to have a static +# type derived from the dynamic type; it should be the other way +# 'round. Dereferencing this oddly typed pointer yielded a value in +# which only the base class's members were initialized, since GDB uses +# the enclosing type to decide how many bytes to read. Members from +# the derived class were garbage, from GDB's address space. +gdb_test "print * (B *) a" ".* = {<A> = {a = 42}, b = 1729}" \ + "cast base class pointer to derived class pointer" + +# Check also that we get the same results from letting the compiler do +# the dereference. +gdb_test "print * b" ".* = {<A> = {a = 42}, b = 1729}" \ + "let compiler cast base class pointer to derived class pointer" |