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From: "andrew.stern at itg dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/60201] New: Issue with CRTP generation under 4.8.1 Date: Fri, 14 Feb 2014 17:46:00 -0000 [thread overview] Message-ID: <bug-60201-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60201 Bug ID: 60201 Summary: Issue with CRTP generation under 4.8.1 Product: gcc Version: 4.8.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: andrew.stern at itg dot com I created a CRTP (Curiously recurring template pattern) and added non-static member variables to my base class and that works without issue. But when I add non-static variables to the subclass instance the initialization and values for the variables in this class don't get initialized properly and also don't consistently keep the same values. I checked the size-of the object and it does seem to contain the correct size that is the Base member variables plus the Subclasses member variables and the this pointer is consistently the same value. It's just that when dumping the values to the screen the ones in the subclass multiple instances of my object are dumping the same values regardless of the object. I'm guessing that that the computation of the offset in the object for these variables is being calculated incorrectly. Note that 472 should have been printed and not 0 in the example below. gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-2/root/usr/libexec/gcc/x86_64-redhat-linux/4.8.1/lto-wrapper Target: x86_64-redhat-linux Configured with: ../configure --prefix=/opt/rh/devtoolset-2/root/usr --mandir=/opt/rh/devtoolset-2/root/usr/share/man --infodir=/opt/rh/devtoolset-2/root/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --enable-languages=c,c++,fortran,lto --enable-plugin --with-linker-hash-style=gnu --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.1-20130715/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.1-20130715/obj-x86_64-redhat-linux/cloog-install --with-mpc=/builddir/build/BUILD/gcc-4.8.1-20130715/obj-x86_64-redhat-linux/mpc-install --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix gcc version 4.8.1 20130715 (Red Hat 4.8.1-4) (GCC) Compile flags: -g;-Wall;-std=c++11;-O0 To execute: ~/crtpbug/crtpbug/Debug/crtpbug Output of application: The this pointer is 7fff2124ec70 with a size of 8 and values of 304 and 0 Source code: #include <stdio.h> struct ParamOne { double val {0.0}; }; struct ParamTwo { int val {0}; }; template<typename P, typename Data, typename Other> class Baseclass { public: using subclass_type = P; using data_type = Data; using other_type = Other; bool Method( const Data &data); public: int m_BaseClassValue { 304 }; }; template<typename P, typename Data, typename Other> using pdata_type = typename P::data_type; template<typename P, typename Data, typename Other> using pother_type = typename P::other_type; template<typename P, typename Data, typename Other> bool Baseclass<P, Data, Other>::Method( const Data &data ) { P& Subclass = static_cast<P&>( *this ); pother_type<P, Data, Other> other; other.val = 11; return Subclass.SubclassMethod( data, other ); } template<typename Data, typename Other> class Subclass : public Baseclass<Subclass<Data, Other>, Data, Other> { public: using data_type = Data; using other_type = Other; bool SubclassMethod( const Data &data, Other &other ); public: int m_SubClassValue { 472 }; }; template<typename Data, typename Other> bool Subclass<Data, Other>::SubclassMethod( const Data &data, Other &other ) { return true; } template<> bool Subclass<ParamOne, ParamTwo>::SubclassMethod( const ParamOne &data, ParamTwo &other ) { printf( "The this pointer is %lx with a size of %ld and values of %d and %d\n", (long)this, sizeof(*this), m_BaseClassValue, m_SubClassValue ); return true; } int main(int argc, char **argv) { ParamOne one; one.val = 5.0; Baseclass<Subclass<ParamOne, ParamTwo>, ParamOne, ParamTwo> test; test.Method(one); return 0; }
next reply other threads:[~2014-02-14 17:46 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-02-14 17:46 andrew.stern at itg dot com [this message] 2014-02-14 19:20 ` [Bug c++/60201] " pinskia at gcc dot gnu.org 2014-02-14 19:30 ` andrew.stern at itg dot com 2014-02-14 19:44 ` pinskia at gcc dot gnu.org 2014-02-14 20:00 ` andrew.stern at itg dot com 2014-02-14 20:07 ` andrew.stern at itg dot com 2014-02-14 20:08 ` andrew.stern at itg dot com
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