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As a preparation for the next patch, which will move fork_inferior from GDB to common/ (and therefore share it with gdbserver), it is interesting to convert a few functions to C++. This patch touches functions related to parsing command-line arguments to the inferior (see gdb/fork-child.c:breakup_args), the way the arguments are stored on fork_inferior (using std::vector instead of char **), and the code responsible for dealing with argv also on gdbserver. I've taken this opportunity and decided to constify a few arguments to fork_inferior/create_inferior as well, in order to make the code cleaner. And now, on gdbserver, we're using xstrdup everywhere and aren't checking for memory allocation failures anymore, as requested by Pedro: <https://sourceware.org/ml/gdb-patches/2017-03/msg00191.html> Message-Id: <025ebdb9-90d9-d54a-c055-57ed2406b812@redhat.com> Pedro Alves wrote: > On the "== NULL" check: IIUC, the old NULL check was there to > handle strdup returning NULL due to out-of-memory. > See NULL checks and comments further above in this function. > Now that you're using a std::vector, that doesn't work or make > sense any longer, since if push_back fails to allocate space for > its internal buffer (with operator new), our operator new replacement > (common/new-op.c) calls malloc_failure, which aborts gdbserver. > > Not sure it makes sense to handle out-of-memory specially in > the gdb/rsp-facing functions nowadays (maybe git blame/log/patch > submission for that code shows some guidelines). Maybe (or, probably) > it's OK to stop caring about it, but then we should consistently remove > left over code, by using xstrdup instead and remove the NULL checks. IMO this refactoring was very good to increase the readability of the code as well, because some parts of the argument handling were unnecessarily confusing before. gdb/ChangeLog: 2017-04-12 Sergio Durigan Junior <sergiodj@redhat.com> * common/common-utils.c (free_vector_argv): New function. * common/common-utils.h: Include <vector>. (free_vector_argv): New prototype. * darwin-nat.c (darwin_create_inferior): Rewrite function prototype in order to constify "exec_file" and accept a "std::string" for "allargs". * fork-child.c: Include <vector>. (breakup_args): Rewrite function, using C++. (fork_inferior): Rewrite function header, constify "exec_file_arg" and accept "std::string" for "allargs". Update the code to calculate "argv" based on "allargs". Update calls to "exec_fun" and "execvp". * gnu-nat.c (gnu_create_inferior): Rewrite function prototype in order to constify "exec_file" and accept a "std::string" for "allargs". * go32-nat.c (go32_create_inferior): Likewise. * inf-ptrace.c (inf_ptrace_create_inferior): Likewise. * infcmd.c (run_command_1): Constify "exec_file". Use "std::string" for inferior arguments. * inferior.h (fork_inferior): Update prototype. * linux-nat.c (linux_nat_create_inferior): Rewrite function prototype in order to constify "exec_file" and accept a "std::string" for "allargs". * nto-procfs.c (procfs_create_inferior): Likewise. * procfs.c (procfs_create_inferior): Likewise. * remote-sim.c (gdbsim_create_inferior): Likewise. * remote.c (extended_remote_run): Update code to accept "std::string" as argument. (extended_remote_create_inferior): Rewrite function prototype in order to constify "exec_file" and accept a "std::string" for "allargs". * rs6000-nat.c (super_create_inferior): Likewise. (rs6000_create_inferior): Likewise. * target.h (struct target_ops) <to_create_inferior>: Likewise. * windows-nat.c (windows_create_inferior): Likewise. gdb/gdbserver/ChangeLog: 2017-04-12 Sergio Durigan Junior <sergiodj@redhat.com> * server.c: Include <vector>. <program_argv, wrapper_argv>: Convert to std::vector. (start_inferior): Rewrite function to use C++. (handle_v_run): Likewise. Update code that calculates the argv based on the vRun packet; use C++. (captured_main): Likewise.
112 lines
3.7 KiB
C++
112 lines
3.7 KiB
C++
/* Shared general utility routines for GDB, the GNU debugger.
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Copyright (C) 1986-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_UTILS_H
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#define COMMON_UTILS_H
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#include <string>
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#include <vector>
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/* If possible, define FUNCTION_NAME, a macro containing the name of
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the function being defined. Since this macro may not always be
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defined, all uses must be protected by appropriate macro definition
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checks (Eg: "#ifdef FUNCTION_NAME").
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Version 2.4 and later of GCC define a magical variable `__PRETTY_FUNCTION__'
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which contains the name of the function currently being defined.
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This is broken in G++ before version 2.6.
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C9x has a similar variable called __func__, but prefer the GCC one since
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it demangles C++ function names. */
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#if (GCC_VERSION >= 2004)
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#define FUNCTION_NAME __PRETTY_FUNCTION__
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#else
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#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
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#define FUNCTION_NAME __func__ /* ARI: func */
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#endif
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#endif
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/* xmalloc(), xrealloc() and xcalloc() have already been declared in
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"libiberty.h". */
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/* Like xmalloc, but zero the memory. */
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void *xzalloc (size_t);
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void xfree (void *);
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/* Like asprintf and vasprintf, but return the string, throw an error
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if no memory. */
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char *xstrprintf (const char *format, ...) ATTRIBUTE_PRINTF (1, 2);
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char *xstrvprintf (const char *format, va_list ap)
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ATTRIBUTE_PRINTF (1, 0);
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/* Like snprintf, but throw an error if the output buffer is too small. */
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int xsnprintf (char *str, size_t size, const char *format, ...)
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ATTRIBUTE_PRINTF (3, 4);
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/* Returns a std::string built from a printf-style format string. */
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std::string string_printf (const char* fmt, ...)
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ATTRIBUTE_PRINTF (1, 2);
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/* Make a copy of the string at PTR with LEN characters
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(and add a null character at the end in the copy).
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Uses malloc to get the space. Returns the address of the copy. */
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char *savestring (const char *ptr, size_t len);
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/* The strerror() function can return NULL for errno values that are
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out of range. Provide a "safe" version that always returns a
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printable string. */
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extern char *safe_strerror (int);
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/* Return non-zero if the start of STRING matches PATTERN, zero
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otherwise. */
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static inline int
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startswith (const char *string, const char *pattern)
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{
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return strncmp (string, pattern, strlen (pattern)) == 0;
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}
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ULONGEST strtoulst (const char *num, const char **trailer, int base);
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/* Skip leading whitespace characters in INP, returning an updated
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pointer. If INP is NULL, return NULL. */
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extern char *skip_spaces (char *inp);
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/* A const-correct version of the above. */
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extern const char *skip_spaces_const (const char *inp);
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/* Skip leading non-whitespace characters in INP, returning an updated
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pointer. If INP is NULL, return NULL. */
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#define skip_to_space(INP) ((char *) skip_to_space_const (INP))
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/* A const-correct version of the above. */
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extern const char *skip_to_space_const (const char *inp);
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/* Assumes that V is an argv for a program, and iterates through
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freeing all the elements. */
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extern void free_vector_argv (std::vector<char *> &v);
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#endif
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