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?
