libc/arch-nacl/syscalls/irt_syscalls.py

header_top = """
#ifndef _IRT_SYSCALLS_H
#define _IRT_SYSCALLS_H

#include <sys/cdefs_elf.h>
#include <machine/cdefs.h>

#include <irt.h>
#include <string.h>

#include <sys/types.h>
#include <sys/epoll.h>
#include <sys/select.h>
#include <poll.h>
#include <stddef.h>
#include <fcntl.h>
#include <time.h>
#include <nacl_stat.h>

#define weak_alias(oldname, newname)       \\
  extern typeof(oldname) newname  __attribute__ ((weak, alias (#oldname)));

struct dirent;
struct epoll_event;
struct msghdr;
struct nacl_abi_stat;
struct sockaddr;
struct timespec;
struct timeval;
struct NaClMemMappingInfo;

typedef void (*nacl_start_func_t)(void);
#define socklen_t long
"""

header_mid = """
// The linker reserves address 0x10030000 as a pointer to the IRT syscalls
// struct.  This address is shared between the loader and dynamically loaded
// executables.
#define _IRT_SYSCALL_PTR (*((_irt_syscalls_t**) 0x10030000))
"""

header_bottom = """

#endif
"""



def PrintFunction(ret, name, args):
  print 'inline %s __%s(%s) {' % (ret, name, ', '.join(args))
  varnames = [arg.split(' ')[-1] for arg in args]
  if ret == 'void':
    rtype = '  '
  else:
    rtype = '  return '
  if varnames == ['void']:
    varnames = []
  print '%s_IRT_SYSCALL_PTR->%s(%s);' % (rtype, name, ', '.join(varnames))
  print '}'

def PrintMacro(ret, name, args):
  print "#define __%s (_IRT_SYSCALL_PTR->%s)" % (name, name)

def ParseSyscalls(lines):
  syscalls = []
  for line in lines:
    ret_end = line.find('(*')
    ret = line[:ret_end]
    name_end = line.find(')')
    name = line[ret_end + 2: name_end]
    args = line[name_end + 2 : -2].split(',')
    args = [x.strip() for x in args]
    syscalls.append((ret, name, args))
  return syscalls

lines = open('irt_syscalls.defs', 'rt').readlines()
syscalls = ParseSyscalls(lines)


print header_top
print '__BEGIN_DECLS'
print 'typedef struct {'
for ret, name, args in syscalls:
  print '  %s (*%s)(%s);' % (ret, name, ', '.join(args))
print '} _irt_syscalls_t;'

print header_mid

for ret, name, args in syscalls:
  PrintMacro(ret, name, args)
print '__END_DECLS'
print header_bottom