GCC Making a new PASS

[Satya Prakash Prasad <satyaprakash dot prasad at gmail dot com>]

I am trying to write a new GCC pass in gcc-4.1.2. This is my first
attempt and I am trying to print lines of code for a function gcc is
compiling. So I added the below code. Note if I remove code in
execute_gimple_manipulation method the issue does not occur :

gcc/gcc-4.1.2 1223> cat gcc/gimple-manipulation.c
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "ggc.h"
#include "flags.h"
#include "tree.h"
#include "basic-block.h"
#include "tree-flow.h"
#include "tree-pass.h"
#include "tree-dump.h"
#include "timevar.h"
#include "diagnostic.h"
#include "cfgloop.h"
#include "tree-scalar-evolution.h"
#include "tree-ssa-propagate.h"
#include "tree-chrec.h"


static void execute_gimple_manipulation (void);
static bool gate_gimple_manipulation (void);

/*-------------------------
  The main driver function.
 -------------------------*/
static void execute_gimple_manipulation (void)
{
  basic_block bb = ENTRY_BLOCK_PTR;
  int bbcounter=0, stmtcounter;
  tree stmt;
  block_stmt_iterator si;

  /* traverse each basic block and print all statements  */

  FOR_EACH_BB (bb){ /* in any order */

    bbcounter++;
    printf("\n-> entering bb # %d (internal #: %d)\n", bbcounter, bb->index);

    stmtcounter=0;

    for(si = bsi_start(bb); !bsi_end_p(si); bsi_next(&si)){
      stmtcounter++;
      printf("   encountering statement #%2d: ", stmtcounter);
      stmt = bsi_stmt(si);
      print_generic_stmt (stderr, stmt, 0);
    }
  }
}

/* ------------------------------------------
   Return true if we should execute our pass.
   ------------------------------------------*/
static bool
gate_gimple_manipulation (void)
{
/*    return (flag_unit_at_a_time != 0  && flag_ipa_gimple_manipulation
           Don't bother doing anything if the program has errors.
          && !(errorcount || sorrycount));*/
  return (/*optimize >= 1*/
          /* Don't bother doing anything if the program has errors.  */
          /*&&*/ !(errorcount || sorrycount));
}
struct tree_opt_pass pass_gimple_manipulation =
{
   "gm_pass_simple",             /* name */
   gate_gimple_manipulation,     /* gate */
   execute_gimple_manipulation,  /* execute */
   NULL,                         /* sub */
   NULL,                         /* next */
   0,                            /* static pass number */
   0,                            /* tv_id */
   PROP_cfg | PROP_ssa | PROP_alias,                            /*
properties required */
   0,                            /* properties provided */
   0,                            /* properties destroyed */
   0,                            /* todo_flags start */
   TODO_dump_func,                            /* todo_flags finish */
   0                             /* letter */
};


My code compilation goes fine for the new file goes fine:

gcc -c   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings
-Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-long
-Wno-variadic-macros -Wold-style-definition -Wmissing-format-attribute
   -DHAVE_CONFIG_H -I. -I. -I../.././gcc -I../.././gcc/.
-I../.././gcc/../include -I../.././gcc/../libcpp/include
../.././gcc/gimple-manipulation.c -o gimple-manipulation.o


But the compilation process fails further on:

gcc/gcc-4.1.2/host-x86_64-unknown-linux-gnu/gcc/xgcc
-Bgcc/gcc-4.1.2/host-x86_64-unknown-linux-gnu/gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/
-B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/local/x86_64-unknown-linux-gnu/include -isystem
/usr/local/x86_64-unknown-linux-gnu/sys-include -O2  -O2 -g -O2
-DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition  -isystem ./include  -fPIC
-g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED  -msse -c
\
                ../.././gcc/config/i386/crtfastmath.c \
                -o crtfastmath.o
../.././gcc/config/i386/crtfastmath.c:110: internal compiler error:
Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
make[2]: *** [crtfastmath.o] Error 1
make[2]: Leaving directory `gcc/gcc-4.1.2/host-x86_64-unknown-linux-gnu/gcc'
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory `gcc/gcc-4.1.2'
make: *** [all] Error 2
gcc/gcc-4.1.2 1223>

Any help – why the issue is occurring and how can I achieve the objective?