perf probe: Add test for regression introduced by switch to die_get_decl_file()

#!/bin/bash

# test perf probe of function from different CU

# SPDX-License-Identifier: GPL-2.0

set -e

temp_dir=$(mktemp -d /tmp/perf-uprobe-different-cu-sh.XXXXXXXXXX)

cleanup()

{

	trap - EXIT TERM INT

	if [[ "${temp_dir}" =~ ^/tmp/perf-uprobe-different-cu-sh.*$ ]]; then

		echo "--- Cleaning up ---"

		perf probe -x ${temp_dir}/testfile -d foo

		rm -f "${temp_dir}/"*

		rmdir "${temp_dir}"

	fi

}

trap_cleanup()

{

        cleanup

        exit 1

}

trap trap_cleanup EXIT TERM INT

cat > ${temp_dir}/testfile-foo.h << EOF

struct t

{

  int *p;

  int c;

};

extern int foo (int i, struct t *t);

EOF

cat > ${temp_dir}/testfile-foo.c << EOF

#include "testfile-foo.h"

int

foo (int i, struct t *t)

{

  int j, res = 0;

  for (j = 0; j < i && j < t->c; j++)

    res += t->p[j];

  return res;

}

EOF

cat > ${temp_dir}/testfile-main.c << EOF

#include "testfile-foo.h"

static struct t g;

int

main (int argc, char **argv)

{

  int i;

  int j[argc];

  g.c = argc;

  g.p = j;

  for (i = 0; i < argc; i++)

    j[i] = (int) argv[i][0];

  return foo (3, &g);

}

EOF

gcc -g -Og -flto -c ${temp_dir}/testfile-foo.c -o ${temp_dir}/testfile-foo.o

gcc -g -Og -c ${temp_dir}/testfile-main.c -o ${temp_dir}/testfile-main.o

gcc -g -Og -o ${temp_dir}/testfile ${temp_dir}/testfile-foo.o ${temp_dir}/testfile-main.o

perf probe -x ${temp_dir}/testfile --funcs foo

perf probe -x ${temp_dir}/testfile foo

cleanup