coregrind/m_options.c

/*--------------------------------------------------------------------*/
/*--- Command line options.                            m_options.c ---*/
/*--------------------------------------------------------------------*/

/*
   This file is part of Valgrind, a dynamic binary instrumentation
   framework.

   Copyright (C) 2000-2012 Nicholas Nethercote
      njn@valgrind.org

   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.

   The GNU General Public License is contained in the file COPYING.
*/

#include "pub_core_basics.h"
#include "pub_core_vki.h"
#include "pub_core_options.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcfile.h"
#include "pub_core_libcprint.h"
#include "pub_core_libcproc.h"
#include "pub_core_mallocfree.h"
#include "pub_core_seqmatch.h"     // VG_(string_match)

// See pub_{core,tool}_options.h for explanations of all these.


/* Define, and set defaults. */
VexControl VG_(clo_vex_control);
Bool   VG_(clo_error_limit)    = True;
Int    VG_(clo_error_exitcode) = 0;

#if defined(VGPV_arm_linux_android) || defined(VGPV_x86_linux_android)
VgVgdb VG_(clo_vgdb)           = Vg_VgdbNo; // currently disabled on Android
#else
VgVgdb VG_(clo_vgdb)           = Vg_VgdbYes;
#endif
Int    VG_(clo_vgdb_poll)      = 5000; 
Int    VG_(clo_vgdb_error)     = 999999999;
const HChar* VG_(clo_vgdb_prefix)    = NULL;
Bool   VG_(clo_vgdb_shadow_registers) = False;

Bool   VG_(clo_db_attach)      = False;
const HChar*  VG_(clo_db_command)     = GDB_PATH " -nw %f %p";
Int    VG_(clo_gen_suppressions) = 0;
Int    VG_(clo_sanity_level)   = 1;
Int    VG_(clo_verbosity)      = 1;
Bool   VG_(clo_stats)          = False;
Bool   VG_(clo_xml)            = False;
const HChar* VG_(clo_xml_user_comment) = NULL;
Bool   VG_(clo_demangle)       = True;
const HChar* VG_(clo_soname_synonyms)    = NULL;
Bool   VG_(clo_trace_children) = False;
const HChar* VG_(clo_trace_children_skip) = NULL;
const HChar* VG_(clo_trace_children_skip_by_arg) = NULL;
Bool   VG_(clo_child_silent_after_fork) = False;
HChar* VG_(clo_log_fname_expanded) = NULL;
HChar* VG_(clo_xml_fname_expanded) = NULL;
Bool   VG_(clo_time_stamp)     = False;
Int    VG_(clo_input_fd)       = 0; /* stdin */
Int    VG_(clo_n_suppressions) = 0;
const HChar* VG_(clo_suppressions)[VG_CLO_MAX_SFILES];
Int    VG_(clo_n_fullpath_after) = 0;
const HChar* VG_(clo_fullpath_after)[VG_CLO_MAX_FULLPATH_AFTER];
const HChar* VG_(clo_extra_debuginfo_path) = NULL;
UChar  VG_(clo_trace_flags)    = 0; // 00000000b
UChar  VG_(clo_profile_flags)  = 0; // 00000000b
Int    VG_(clo_trace_notbelow) = -1;  // unspecified
Int    VG_(clo_trace_notabove) = -1;  // unspecified
Bool   VG_(clo_trace_syscalls) = False;
Bool   VG_(clo_trace_signals)  = False;
Bool   VG_(clo_trace_symtab)   = False;
const HChar* VG_(clo_trace_symtab_patt) = "*";
Bool   VG_(clo_trace_cfi)      = False;
Bool   VG_(clo_debug_dump_syms) = False;
Bool   VG_(clo_debug_dump_line) = False;
Bool   VG_(clo_debug_dump_frames) = False;
Bool   VG_(clo_trace_redir)    = False;
enum FairSchedType
       VG_(clo_fair_sched)     = disable_fair_sched;
Bool   VG_(clo_trace_sched)    = False;
Bool   VG_(clo_profile_heap)   = False;
Int    VG_(clo_core_redzone_size) = CORE_REDZONE_DEFAULT_SZB;
// A value != -1 overrides the tool-specific value
// VG_(needs_malloc_replacement).tool_client_redzone_szB
Int    VG_(clo_redzone_size)   = -1;
Int    VG_(clo_dump_error)     = 0;
Int    VG_(clo_backtrace_size) = 12;
const HChar* VG_(clo_sim_hints)      = NULL;
Bool   VG_(clo_sym_offsets)    = False;
Bool   VG_(clo_read_var_info)  = False;
Int    VG_(clo_n_req_tsyms)    = 0;
const HChar* VG_(clo_req_tsyms)[VG_CLO_MAX_REQ_TSYMS];
HChar* VG_(clo_require_text_symbol) = NULL;
Bool   VG_(clo_run_libc_freeres) = True;
Bool   VG_(clo_track_fds)      = False;
Bool   VG_(clo_show_below_main)= False;
Bool   VG_(clo_show_emwarns)   = False;
Word   VG_(clo_max_stackframe) = 2000000;
Word   VG_(clo_main_stacksize) = 0; /* use client's rlimit.stack */
Bool   VG_(clo_wait_for_gdb)   = False;
VgSmc  VG_(clo_smc_check)      = Vg_SmcStack;
const HChar* VG_(clo_kernel_variant) = NULL;
Bool   VG_(clo_dsymutil)       = False;
Bool   VG_(clo_sigill_diag)    = True;

/*====================================================================*/
/*=== File expansion                                               ===*/
/*====================================================================*/

// Copies the string, prepending it with the startup working directory, and
// expanding %p and %q entries.  Returns a new, malloc'd string.
HChar* VG_(expand_file_name)(const HChar* option_name, const HChar* format)
{
   static HChar base_dir[VKI_PATH_MAX];
   Int len, i = 0, j = 0;
   HChar* out;

   Bool ok = VG_(get_startup_wd)(base_dir, VKI_PATH_MAX);
   tl_assert(ok);

   if (VG_STREQ(format, "")) {
      // Empty name, bad.
      VG_(fmsg)("%s: filename is empty", option_name);
      goto bad;
   }
   
   // If 'format' starts with a '~', abort -- the user probably expected the
   // shell to expand but it didn't (see bug 195268 for details).  This means
   // that we don't allow a legitimate filename beginning with '~' but that
   // seems very unlikely.
   if (format[0] == '~') {
      VG_(fmsg)(
         "%s: filename begins with '~'\n"
         "You probably expected the shell to expand the '~', but it\n"
         "didn't.  The rules for '~'-expansion vary from shell to shell.\n"
         "You might have more luck using $HOME instead.\n",
         option_name
      );
      goto bad;
   }

   // If 'format' starts with a '/', do not prefix with startup dir.
   if (format[0] != '/') {
      j += VG_(strlen)(base_dir);
   }

   // The 10 is slop, it should be enough in most cases.
   len = j + VG_(strlen)(format) + 10;
   out = VG_(malloc)( "options.efn.1", len );
   if (format[0] != '/') {
      VG_(strcpy)(out, base_dir);
      out[j++] = '/';
   }

#define ENSURE_THIS_MUCH_SPACE(x) \
   if (j + x >= len) { \
      len += (10 + x); \
      out = VG_(realloc)("options.efn.2(multiple)", out, len); \
   }

   while (format[i]) {
      if (format[i] != '%') {
         ENSURE_THIS_MUCH_SPACE(1);
         out[j++] = format[i++];
         
      } else {
         // We saw a '%'.  What's next...
         i++;
         if      ('%' == format[i]) {
            // Replace '%%' with '%'.
            ENSURE_THIS_MUCH_SPACE(1);
            out[j++] = format[i++];
         }
         else if ('p' == format[i]) {
            // Print the PID.  Assume that it's not longer than 10 chars --
            // reasonable since 'pid' is an Int (ie. 32 bits).
            Int pid = VG_(getpid)();
            ENSURE_THIS_MUCH_SPACE(10);
            j += VG_(sprintf)(&out[j], "%d", pid);
            i++;
         } 
         else if ('q' == format[i]) {
            i++;
            if ('{' == format[i]) {
               // Get the env var name, print its contents.
               const HChar* qualname;
               HChar* qual;
               i++;
               qualname = &format[i];
               while (True) {
                  if (0 == format[i]) {
                     VG_(fmsg)("%s: malformed %%q specifier\n", option_name);
                     goto bad;
                  } else if ('}' == format[i]) {
                     // Temporarily replace the '}' with NUL to extract var
                     // name.
                     // FIXME: this is not safe as FORMAT is sometimes a
                     // string literal which may reside in read-only memory
                    ((HChar *)format)[i] = 0;
                     qual = VG_(getenv)(qualname);
                     if (NULL == qual) {
                        VG_(fmsg)("%s: environment variable %s is not set\n",
                                  option_name, qualname);
                     // FIXME: this is not safe as FORMAT is sometimes a
                     // string literal which may reside in read-only memory
                        ((HChar *)format)[i] = '}';  // Put the '}' back.
                        goto bad;
                     }
                     // FIXME: this is not safe as FORMAT is sometimes a
                     // string literal which may reside in read-only memory
                     ((HChar *)format)[i] = '}';     // Put the '}' back.
                     i++;
                     break;
                  }
                  i++;
               }
               ENSURE_THIS_MUCH_SPACE(VG_(strlen)(qual));
               j += VG_(sprintf)(&out[j], "%s", qual);
            } else {
               VG_(fmsg)("%s: expected '{' after '%%q'\n", option_name);
               goto bad;
            }
         } 
         else {
            // Something else, abort.
            VG_(fmsg)("%s: expected 'p' or 'q' or '%%' after '%%'\n",
                      option_name);
            goto bad;
         }
      }
   }
   ENSURE_THIS_MUCH_SPACE(1);
   out[j++] = 0;

   return out;

  bad: {
   HChar* opt =    // 2:  1 for the '=', 1 for the NUL.
      VG_(malloc)( "options.efn.3",
                   VG_(strlen)(option_name) + VG_(strlen)(format) + 2 );
   VG_(strcpy)(opt, option_name);
   VG_(strcat)(opt, "=");
   VG_(strcat)(opt, format);
   VG_(fmsg_bad_option)(opt, "");
  }
}

/*====================================================================*/
/*=== --trace-children= support                                    ===*/
/*====================================================================*/

static HChar const* consume_commas ( HChar const* c ) {
   while (*c && *c == ',') {
      ++c;
   }
   return c;
}

static HChar const* consume_field ( HChar const* c ) {
   while (*c && *c != ',') {
      ++c;
   }
   return c;
}

/* Should we trace into this child executable (across execve etc) ?
   This involves considering --trace-children=,
   --trace-children-skip=, --trace-children-skip-by-arg=, and the name
   of the executable.  'child_argv' must not include the name of the
   executable itself; iow child_argv[0] must be the first arg, if any,
   for the child. */
Bool VG_(should_we_trace_this_child) ( HChar* child_exe_name,
                                       HChar** child_argv )
{
   // child_exe_name is pulled out of the guest's space.  We
   // should be at least marginally cautious with it, lest it
   // explode or burst into flames unexpectedly.
   if (child_exe_name == NULL || VG_(strlen)(child_exe_name) == 0)
      return VG_(clo_trace_children);  // we know narfink

   // If --trace-children=no, the answer is simply NO.
   if (! VG_(clo_trace_children))
      return False;

   // Otherwise, look for other reasons to say NO.  First,
   // see if the exe name matches any of the patterns specified
   // by --trace-children-skip=.
   if (VG_(clo_trace_children_skip)) {
      HChar const* last = VG_(clo_trace_children_skip);
      HChar const* name = child_exe_name;
      while (*last) {
         Bool   matches;
         HChar* patt;
         HChar const* first = consume_commas(last);
         last = consume_field(first);
         if (first == last)
            break;
         vg_assert(last > first);
         /* copy the candidate string into a temporary malloc'd block
            so we can use VG_(string_match) on it. */
         patt = VG_(calloc)("m_options.swttc.1", last - first + 1, 1);
         VG_(memcpy)(patt, first, last - first);
         vg_assert(patt[last-first] == 0);
         matches = VG_(string_match)(patt, name);
         VG_(free)(patt);
         if (matches)
            return False;
      }
   }

   // Check if any of the args match any of the patterns specified
   // by --trace-children-skip-by-arg=. 
   if (VG_(clo_trace_children_skip_by_arg) && child_argv != NULL) {
      HChar const* last = VG_(clo_trace_children_skip_by_arg);
      while (*last) {
         Int    i;
         Bool   matches;
         HChar* patt;
         HChar const* first = consume_commas(last);
         last = consume_field(first);
         if (first == last)
            break;
         vg_assert(last > first);
         /* copy the candidate string into a temporary malloc'd block
            so we can use VG_(string_match) on it. */
         patt = VG_(calloc)("m_options.swttc.1", last - first + 1, 1);
         VG_(memcpy)(patt, first, last - first);
         vg_assert(patt[last-first] == 0);
         for (i = 0; child_argv[i]; i++) {
            matches = VG_(string_match)(patt, child_argv[i]);
            if (matches) {
               VG_(free)(patt);
               return False;
            }
         }
         VG_(free)(patt);
      }
   }

   // --trace-children=yes, and this particular executable isn't
   // excluded
   return True;
}


/*--------------------------------------------------------------------*/
/*--- end                                                          ---*/
/*--------------------------------------------------------------------*/