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binutils-gdb/gdbsupport/gdb_proc_service.h
Simon Marchi 56d9e3c562 gdbsupport/gdb_proc_service.h: use decltype instead of typeof 
Bug 28341 shows that GDB fails to compile when built with -std=c++11.
I don't know much about the use case, but according to the author of the
bug:

    I encountered the scenario where CXX is set to "g++ -std=c++11" when
    I try to compile binutils under GCC as part of the GCC 3-stage
    compilation, which is common for building a cross-compiler.

The author of the bug suggests using __typeof__ instead of typeof.  But
since we're using C++, we might as well use decltype, which is standard.
This is what this patch does.

The failure (and fix) can be observed by configuring GDB with CXX="g++
-std=c++11":

      CXX    linux-low.o
    In file included from /home/simark/src/binutils-gdb/gdbserver/gdb_proc_service.h:22,
		     from /home/simark/src/binutils-gdb/gdbserver/linux-low.h:27,
		     from /home/simark/src/binutils-gdb/gdbserver/linux-low.cc:20:
    /home/simark/src/binutils-gdb/gdbserver/../gdbsupport/gdb_proc_service.h:177:50: error: expected constructor, destructor, or type conversion before (token
      177 |   __attribute__((visibility ("default"))) typeof (SYM) SYM
	  |                                                  ^
    /home/simark/src/binutils-gdb/gdbserver/../gdbsupport/gdb_proc_service.h:179:1: note: in expansion of macro PS_EXPORT
      179 | PS_EXPORT (ps_get_thread_area);
	  | ^~~~~~~~~

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28341
Change-Id: I84fbaae938209d8d935ca08dec9b7e6a0dd1bda0
2021-09-20 07:59:53 -04:00

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/* <proc_service.h> replacement for systems that don't have it.
Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of GDB.
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 3 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, see <http://www.gnu.org/licenses/>. */
#ifndef COMMON_GDB_PROC_SERVICE_H
#define COMMON_GDB_PROC_SERVICE_H
#include <sys/types.h>
#ifdef HAVE_PROC_SERVICE_H
/* glibc's proc_service.h doesn't wrap itself with extern "C". Need
to do it ourselves. */
EXTERN_C_PUSH
#include <proc_service.h>
EXTERN_C_POP
#else /* HAVE_PROC_SERVICE_H */
/* The following fallback definitions have been imported and adjusted
from glibc's proc_service.h */
/* Callback interface for libthread_db, functions users must define.
Copyright (C) 1999,2002,2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* The definitions in this file must correspond to those in the debugger. */
#ifdef HAVE_SYS_PROCFS_H
#include <sys/procfs.h>
#endif
/* Not all platforms bring in <linux/elf.h> via <sys/procfs.h>. If
<sys/procfs.h> wasn't enough to find elf_fpregset_t, try the kernel
headers also (but don't if we don't need to). */
#ifndef HAVE_ELF_FPREGSET_T
# ifdef HAVE_LINUX_ELF_H
# include <linux/elf.h>
# endif
#endif
EXTERN_C_PUSH
/* Functions in this interface return one of these status codes. */
typedef enum
{
PS_OK, /* Generic "call succeeded". */
PS_ERR, /* Generic error. */
PS_BADPID, /* Bad process handle. */
PS_BADLID, /* Bad LWP identifier. */
PS_BADADDR, /* Bad address. */
PS_NOSYM, /* Could not find given symbol. */
PS_NOFREGS /* FPU register set not available for given LWP. */
} ps_err_e;
#ifndef HAVE_LWPID_T
typedef unsigned int lwpid_t;
#endif
#ifndef HAVE_PSADDR_T
typedef void *psaddr_t;
#endif
#ifndef HAVE_PRGREGSET_T
typedef elf_gregset_t prgregset_t;
#endif
#ifndef HAVE_PRFPREGSET_T
typedef elf_fpregset_t prfpregset_t;
#endif
/* This type is opaque in this interface. It's defined by the user of
libthread_db. GDB's version is defined below. */
struct ps_prochandle;
/* Read or write process memory at the given address. */
extern ps_err_e ps_pdread (struct ps_prochandle *,
psaddr_t, void *, size_t);
extern ps_err_e ps_pdwrite (struct ps_prochandle *,
psaddr_t, const void *, size_t);
extern ps_err_e ps_ptread (struct ps_prochandle *,
psaddr_t, void *, size_t);
extern ps_err_e ps_ptwrite (struct ps_prochandle *,
psaddr_t, const void *, size_t);
/* Get and set the given LWP's general or FPU register set. */
extern ps_err_e ps_lgetregs (struct ps_prochandle *,
lwpid_t, prgregset_t);
extern ps_err_e ps_lsetregs (struct ps_prochandle *,
lwpid_t, const prgregset_t);
extern ps_err_e ps_lgetfpregs (struct ps_prochandle *,
lwpid_t, prfpregset_t *);
extern ps_err_e ps_lsetfpregs (struct ps_prochandle *,
lwpid_t, const prfpregset_t *);
/* Return the PID of the process. */
extern pid_t ps_getpid (struct ps_prochandle *);
/* Fetch the special per-thread address associated with the given LWP.
This call is only used on a few platforms (most use a normal register).
The meaning of the `int' parameter is machine-dependent. */
extern ps_err_e ps_get_thread_area (struct ps_prochandle *,
lwpid_t, int, psaddr_t *);
/* Look up the named symbol in the named DSO in the symbol tables
associated with the process being debugged, filling in *SYM_ADDR
with the corresponding run-time address. */
extern ps_err_e ps_pglobal_lookup (struct ps_prochandle *,
const char *object_name,
const char *sym_name,
psaddr_t *sym_addr);
/* Stop or continue the entire process. */
extern ps_err_e ps_pstop (struct ps_prochandle *);
extern ps_err_e ps_pcontinue (struct ps_prochandle *);
/* Stop or continue the given LWP alone. */
extern ps_err_e ps_lstop (struct ps_prochandle *, lwpid_t);
extern ps_err_e ps_lcontinue (struct ps_prochandle *, lwpid_t);
/* The following are only defined in/called by Solaris. */
/* Get size of extra register set. */
extern ps_err_e ps_lgetxregsize (struct ps_prochandle *ph,
lwpid_t lwpid, int *xregsize);
/* Get extra register set. */
extern ps_err_e ps_lgetxregs (struct ps_prochandle *ph, lwpid_t lwpid,
caddr_t xregset);
extern ps_err_e ps_lsetxregs (struct ps_prochandle *ph, lwpid_t lwpid,
caddr_t xregset);
/* Log a message (sends to gdb_stderr). */
extern void ps_plog (const char *fmt, ...);
EXTERN_C_POP
#endif /* HAVE_PROC_SERVICE_H */
/* Make sure we export the needed symbols, in case GDB is built with
-fvisibility=hidden. */
#define PS_EXPORT(SYM) \
__attribute__((visibility ("default"))) decltype (SYM) SYM
PS_EXPORT (ps_get_thread_area);
PS_EXPORT (ps_getpid);
PS_EXPORT (ps_lcontinue);
PS_EXPORT (ps_lgetfpregs);
PS_EXPORT (ps_lgetregs);
PS_EXPORT (ps_lsetfpregs);
PS_EXPORT (ps_lsetregs);
PS_EXPORT (ps_lstop);
PS_EXPORT (ps_pcontinue);
PS_EXPORT (ps_pdread);
PS_EXPORT (ps_pdwrite);
PS_EXPORT (ps_pglobal_lookup);
PS_EXPORT (ps_pstop);
PS_EXPORT (ps_ptread);
PS_EXPORT (ps_ptwrite);
#ifdef __sun__
PS_EXPORT (ps_lgetxregs);
PS_EXPORT (ps_lgetxregsize);
PS_EXPORT (ps_lsetxregs);
PS_EXPORT (ps_plog);
#endif
#endif /* COMMON_GDB_PROC_SERVICE_H */
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