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ocaml/byterun/startup.c

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/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Xavier Leroy and Damien Doligez, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../LICENSE. */
/* */
/***********************************************************************/
/* $Id$ */
/* Start-up code */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include "config.h"
#ifdef HAS_UNISTD
#include <unistd.h>
#endif
#ifdef _WIN32
#include <process.h>
#endif
#include "alloc.h"
#include "backtrace.h"
#include "callback.h"
#include "custom.h"
#include "debugger.h"
#include "dynlink.h"
#include "exec.h"
#include "fail.h"
#include "fix_code.h"
#include "gc_ctrl.h"
#include "instrtrace.h"
#include "interp.h"
#include "intext.h"
#include "io.h"
#include "memory.h"
#include "minor_gc.h"
#include "misc.h"
#include "mlvalues.h"
#include "osdeps.h"
#include "prims.h"
#include "printexc.h"
#include "reverse.h"
#include "signals.h"
#include "stacks.h"
#include "sys.h"
#include "startup.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifndef SEEK_END
#define SEEK_END 2
#endif
extern int parser_trace;
CAMLexport header_t atom_table[256];
/* Initialize the atom table */
static void init_atoms(void)
{
int i;
for(i = 0; i < 256; i++) atom_table[i] = Make_header(0, i, Caml_white);
}
/* Read the trailer of a bytecode file */
static void fixup_endianness_trailer(uint32 * p)
{
#ifndef ARCH_BIG_ENDIAN
Reverse_32(p, p);
#endif
}
static int read_trailer(int fd, struct exec_trailer *trail)
{
lseek(fd, (long) -TRAILER_SIZE, SEEK_END);
if (read(fd, (char *) trail, TRAILER_SIZE) < TRAILER_SIZE)
return BAD_BYTECODE;
fixup_endianness_trailer(&trail->num_sections);
if (strncmp(trail->magic, EXEC_MAGIC, 12) == 0)
return 0;
else
return BAD_BYTECODE;
}
int attempt_open(char **name, struct exec_trailer *trail,
int do_open_script)
{
char * truename;
int fd;
int err;
char buf [2];
truename = search_exe_in_path(*name);
*name = truename;
gc_message(0x100, "Opening bytecode executable %s\n",
(unsigned long) truename);
fd = open(truename, O_RDONLY | O_BINARY);
if (fd == -1) {
gc_message(0x100, "Cannot open file\n", 0);
return FILE_NOT_FOUND;
}
if (!do_open_script) {
err = read (fd, buf, 2);
if (err < 2 || (buf [0] == '#' && buf [1] == '!')) {
close(fd);
gc_message(0x100, "Rejected #! script\n", 0);
return BAD_BYTECODE;
}
}
err = read_trailer(fd, trail);
if (err != 0) {
close(fd);
gc_message(0x100, "Not a bytecode executable\n", 0);
return err;
}
return fd;
}
/* Read the section descriptors */
void read_section_descriptors(int fd, struct exec_trailer *trail)
{
int toc_size, i;
toc_size = trail->num_sections * 8;
trail->section = stat_alloc(toc_size);
lseek(fd, - (long) (TRAILER_SIZE + toc_size), SEEK_END);
if (read(fd, (char *) trail->section, toc_size) != toc_size)
fatal_error("Fatal error: cannot read section table\n");
/* Fixup endianness of lengths */
for (i = 0; i < trail->num_sections; i++)
fixup_endianness_trailer(&(trail->section[i].len));
}
/* Position fd at the beginning of the section having the given name.
Return the length of the section data in bytes, or -1 if no section
found with that name. */
int32 seek_optional_section(int fd, struct exec_trailer *trail, char *name)
{
long ofs;
int i;
ofs = TRAILER_SIZE + trail->num_sections * 8;
for (i = trail->num_sections - 1; i >= 0; i--) {
ofs += trail->section[i].len;
if (strncmp(trail->section[i].name, name, 4) == 0) {
lseek(fd, -ofs, SEEK_END);
return trail->section[i].len;
}
}
return -1;
}
/* Position fd at the beginning of the section having the given name.
Return the length of the section data in bytes. */
int32 seek_section(int fd, struct exec_trailer *trail, char *name)
{
int32 len = seek_optional_section(fd, trail, name);
if (len == -1)
fatal_error_arg("Fatal_error: section `%s' is missing\n", name);
return len;
}
/* Read and return the contents of the section having the given name.
Add a terminating 0. Return NULL if no such section. */
static char * read_section(int fd, struct exec_trailer *trail, char *name)
{
int32 len;
char * data;
len = seek_optional_section(fd, trail, name);
if (len == -1) return NULL;
data = stat_alloc(len + 1);
if (read(fd, data, len) != len)
fatal_error_arg("Fatal error: error reading section %s\n", name);
data[len] = 0;
return data;
}
/* Invocation of ocamlrun: 4 cases.
1. runtime + bytecode
user types: ocamlrun [options] bytecode args...
arguments: ocamlrun [options] bytecode args...
2. bytecode script
user types: bytecode args...
2a (kernel 1) arguments: ocamlrun ./bytecode args...
2b (kernel 2) arguments: bytecode bytecode args...
3. concatenated runtime and bytecode
user types: composite args...
arguments: composite args...
Algorithm:
1- If argument 0 is a valid byte-code file that does not start with #!,
then we are in case 3 and we pass the same command line to the
Objective Caml program.
2- In all other cases, we parse the command line as:
(whatever) [options] bytecode args...
and we strip "(whatever) [options]" from the command line.
*/
/* Configuration parameters and flags */
static unsigned long percent_free_init = Percent_free_def;
static unsigned long max_percent_free_init = Max_percent_free_def;
static unsigned long minor_heap_init = Minor_heap_def;
static unsigned long heap_chunk_init = Heap_chunk_def;
static unsigned long heap_size_init = Init_heap_def;
static unsigned long max_stack_init = Max_stack_def;
/* Parse options on the command line */
static int parse_command_line(char **argv)
{
int i, j;
for(i = 1; argv[i] != NULL && argv[i][0] == '-'; i++) {
switch(argv[i][1]) {
#ifdef DEBUG
case 't':
trace_flag = 1;
break;
#endif
case 'v':
verb_gc = 0x001+0x004+0x008+0x010+0x020;
break;
case 'p':
for (j = 0; names_of_builtin_cprim[j] != NULL; j++)
printf("%s\n", names_of_builtin_cprim[j]);
exit(0);
break;
case 'b':
init_backtrace();
break;
case 'I':
if (argv[i + 1] != NULL) {
ext_table_add(&shared_libs_path, argv[i + 1]);
i++;
}
break;
default:
fatal_error_arg("Unknown option %s.\n", argv[i]);
}
}
return i;
}
/* Parse the CAMLRUNPARAM variable */
/* The option letter for each runtime option is the first letter of the
last word of the ML name of the option (see [stdlib/gc.mli]).
Except for l (maximum stack size) and h (initial heap size).
*/
/* If you change these functions, see also their copy in asmrun/startup.c */
static void scanmult (char *opt, long unsigned int *var)
{
char mult = ' ';
sscanf (opt, "=%lu%c", var, &mult);
sscanf (opt, "=0x%lx%c", var, &mult);
if (mult == 'k') *var = *var * 1024;
if (mult == 'M') *var = *var * 1024 * 1024;
if (mult == 'G') *var = *var * 1024 * 1024 * 1024;
}
static void parse_camlrunparam(void)
{
char *opt = getenv ("OCAMLRUNPARAM");
if (opt == NULL) opt = getenv ("CAMLRUNPARAM");
if (opt != NULL){
while (*opt != '\0'){
switch (*opt++){
case 's': scanmult (opt, &minor_heap_init); break;
case 'i': scanmult (opt, &heap_chunk_init); break;
case 'h': scanmult (opt, &heap_size_init); break;
case 'l': scanmult (opt, &max_stack_init); break;
case 'o': scanmult (opt, &percent_free_init); break;
case 'O': scanmult (opt, &max_percent_free_init); break;
case 'v': scanmult (opt, &verb_gc); break;
case 'b': init_backtrace(); break;
case 'p': parser_trace = 1; break;
}
}
}
}
extern void init_ieee_floats (void);
#ifdef _WIN32
extern void caml_signal_thread(void * lpParam);
#endif
/* Main entry point when loading code from a file */
CAMLexport void caml_main(char **argv)
{
int fd, pos;
struct exec_trailer trail;
struct channel * chan;
value res;
char * shared_lib_path, * shared_libs, * req_prims;
char * exe_name;
#ifdef __linux__
static char proc_self_exe[256];
int retcode;
#endif
/* Machine-dependent initialization of the floating-point hardware
so that it behaves as much as possible as specified in IEEE */
init_ieee_floats();
init_custom_operations();
ext_table_init(&shared_libs_path, 8);
external_raise = NULL;
/* Determine options and position of bytecode file */
#ifdef DEBUG
verb_gc = 63;
#endif
parse_camlrunparam();
pos = 0;
exe_name = argv[0];
#ifdef __linux__
/* Recover executable name from /proc/self/exe, much more reliable */
retcode = readlink("/proc/self/exe", proc_self_exe, sizeof(proc_self_exe));
if (retcode != -1 && retcode < sizeof(proc_self_exe)) {
proc_self_exe[retcode] = 0;
exe_name = proc_self_exe;
}
#endif
fd = attempt_open(&exe_name, &trail, 0);
if (fd < 0) {
pos = parse_command_line(argv);
if (argv[pos] == 0)
fatal_error("No bytecode file specified.\n");
exe_name = argv[pos];
fd = attempt_open(&exe_name, &trail, 1);
switch(fd) {
case FILE_NOT_FOUND:
fatal_error_arg("Fatal error: cannot find file %s\n", argv[pos]);
break;
case BAD_BYTECODE:
fatal_error_arg(
"Fatal error: the file %s is not a bytecode executable file\n",
argv[pos]);
break;
}
}
/* Read the table of contents (section descriptors) */
read_section_descriptors(fd, &trail);
/* Initialize the abstract machine */
init_gc (minor_heap_init, heap_size_init, heap_chunk_init,
percent_free_init, max_percent_free_init);
init_stack (max_stack_init);
init_atoms();
/* Initialize the interpreter */
interprete(NULL, 0);
/* Initialize the debugger, if needed */
debugger_init();
/* Load the code */
code_size = seek_section(fd, &trail, "CODE");
load_code(fd, code_size);
/* Build the table of primitives */
shared_lib_path = read_section(fd, &trail, "DLPT");
shared_libs = read_section(fd, &trail, "DLLS");
req_prims = read_section(fd, &trail, "PRIM");
if (req_prims == NULL) fatal_error("Fatal error: no PRIM section\n");
build_primitive_table(shared_lib_path, shared_libs, req_prims);
stat_free(shared_lib_path);
stat_free(shared_libs);
stat_free(req_prims);
/* Load the globals */
seek_section(fd, &trail, "DATA");
chan = open_descriptor_in(fd);
global_data = input_val(chan);
close_channel(chan); /* this also closes fd */
stat_free(trail.section);
/* Ensure that the globals are in the major heap. */
oldify_one (global_data, &global_data);
oldify_mopup ();
/* Initialize system libraries */
init_exceptions();
sys_init(exe_name, argv + pos);
#ifdef _WIN32
/* Start a thread to handle signals */
if (getenv("CAMLSIGPIPE"))
_beginthread(caml_signal_thread, 4096, NULL);
#endif
/* Execute the program */
debugger(PROGRAM_START);
res = interprete(start_code, code_size);
if (Is_exception_result(res)) {
exn_bucket = Extract_exception(res);
if (debugger_in_use) {
extern_sp = &exn_bucket; /* The debugger needs the exception value. */
debugger(UNCAUGHT_EXC);
}
fatal_uncaught_exception(exn_bucket);
}
}
/* Main entry point when code is linked in as initialized data */
CAMLexport void caml_startup_code(code_t code, asize_t code_size,
char *data, char **argv)
{
value res;
init_ieee_floats();
#ifdef DEBUG
verb_gc = 63;
#endif
parse_camlrunparam();
external_raise = NULL;
/* Initialize the abstract machine */
init_gc (minor_heap_init, heap_size_init, heap_chunk_init,
percent_free_init, max_percent_free_init);
init_stack (max_stack_init);
init_atoms();
/* Initialize the interpreter */
interprete(NULL, 0);
/* Load the code */
start_code = code;
#ifdef THREADED_CODE
thread_code(start_code, code_size);
#endif
/* Use the builtin table of primitives */
prim_table.size = prim_table.capacity = -1;
prim_table.contents = (void **) builtin_cprim;
/* Load the globals */
global_data = input_val_from_string((value)data, 0);
/* Ensure that the globals are in the major heap. */
oldify_one (global_data, &global_data);
oldify_mopup ();
/* Run the code */
init_exceptions();
sys_init("", argv);
res = interprete(start_code, code_size);
if (Is_exception_result(res))
fatal_uncaught_exception(Extract_exception(res));
}
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