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eval.c
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eval.c
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/************************************************
eval.c -
$Author$
$Date$
created at: Thu Jun 10 14:22:17 JST 1993
Copyright (C) 1993-1998 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
#include "node.h"
#include "env.h"
#include "sig.h"
#include <stdio.h>
#include <setjmp.h>
#include "st.h"
#include "dln.h"
#ifndef HAVE_STRING_H
char *strrchr _((char*,char));
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef setjmp
#ifdef HAVE__SETJMP
#define setjmp(env) _setjmp(env)
#define longjmp(env,val) _longjmp(env,val)
#endif
#endif
VALUE cProc;
static VALUE cBinding;
static VALUE proc_call _((VALUE,VALUE));
static VALUE f_binding _((VALUE));
static void f_END _((void));
static VALUE f_iterator_p _((void));
static VALUE block_pass _((VALUE,NODE*));
static VALUE cMethod;
static VALUE method_proc _((VALUE));
static int scope_vmode;
#define SCOPE_PUBLIC 0
#define SCOPE_PRIVATE 1
#define SCOPE_PROTECTED 2
#define SCOPE_MODFUNC 5
#define SCOPE_MASK 7
#define SCOPE_SET(f) do {scope_vmode=(f);} while(0)
#define SCOPE_TEST(f) (scope_vmode&(f))
#define CACHE_SIZE 0x200
#define CACHE_MASK 0x1ff
#define EXPR1(c,m) ((((int)(c)>>3)^(m))&CACHE_MASK)
struct cache_entry { /* method hash table. */
ID mid; /* method's id */
ID mid0; /* method's original id */
VALUE klass; /* receiver's class */
VALUE origin; /* where method defined */
NODE *method;
int noex;
};
static struct cache_entry cache[CACHE_SIZE];
void
rb_clear_cache()
{
struct cache_entry *ent, *end;
ent = cache; end = ent + CACHE_SIZE;
while (ent < end) {
ent->mid = 0;
ent++;
}
}
static void
rb_clear_cache_by_id(id)
ID id;
{
struct cache_entry *ent, *end;
ent = cache; end = ent + CACHE_SIZE;
while (ent < end) {
if (ent->mid == id) {
ent->mid = 0;
}
ent++;
}
}
void
rb_add_method(klass, mid, node, noex)
VALUE klass;
ID mid;
NODE *node;
int noex;
{
NODE *body;
if (NIL_P(klass)) klass = cObject;
body = NEW_METHOD(node, noex);
st_insert(RCLASS(klass)->m_tbl, mid, body);
}
static NODE*
search_method(klass, id, origin)
VALUE klass, *origin;
ID id;
{
NODE *body;
while (!st_lookup(RCLASS(klass)->m_tbl, id, &body)) {
klass = RCLASS(klass)->super;
if (!klass) return 0;
}
if (origin) *origin = klass;
return body;
}
static NODE*
rb_get_method_body(klassp, idp, noexp)
VALUE *klassp;
ID *idp;
int *noexp;
{
ID id = *idp;
VALUE klass = *klassp;
VALUE origin;
NODE *body;
struct cache_entry *ent;
if ((body = search_method(klass, id, &origin)) == 0) {
return 0;
}
if (!body->nd_body) return 0;
/* store in cache */
ent = cache + EXPR1(klass, id);
ent->klass = klass;
ent->noex = body->nd_noex;
body = body->nd_body;
if (nd_type(body) == NODE_FBODY) {
ent->mid = id;
*klassp = body->nd_orig;
ent->origin = body->nd_orig;
*idp = ent->mid0 = body->nd_mid;
body = ent->method = body->nd_head;
}
else {
*klassp = origin;
ent->origin = origin;
ent->mid = ent->mid0 = id;
ent->method = body;
}
if (noexp) *noexp = ent->noex;
return body;
}
void
rb_alias(klass, name, def)
VALUE klass;
ID name, def;
{
VALUE origin;
NODE *orig, *body;
if (name == def) return;
orig = search_method(klass, def, &origin);
if (!orig || !orig->nd_body) {
if (TYPE(klass) == T_MODULE) {
orig = search_method(cObject, def, &origin);
}
}
if (!orig || !orig->nd_body) {
NameError("undefined method `%s' for `%s'",
rb_id2name(def), rb_class2name(klass));
}
body = orig->nd_body;
if (nd_type(body) == NODE_FBODY) { /* was alias */
body = body->nd_head;
def = body->nd_mid;
origin = body->nd_orig;
}
st_insert(RCLASS(klass)->m_tbl, name,
NEW_METHOD(NEW_FBODY(body, def, origin), orig->nd_noex));
}
static void
remove_method(klass, mid)
VALUE klass;
ID mid;
{
NODE *body;
if (!st_delete(RCLASS(klass)->m_tbl, &mid, &body)) {
NameError("method `%s' not defined in %s",
rb_id2name(mid), rb_class2name(klass));
}
rb_clear_cache_by_id(mid);
}
void
rb_remove_method(klass, name)
VALUE klass;
char *name;
{
remove_method(klass, rb_intern(name));
}
void
rb_disable_super(klass, name)
VALUE klass;
char *name;
{
VALUE origin;
NODE *body;
ID mid = rb_intern(name);
body = search_method(klass, mid, &origin);
if (!body || !body->nd_body) {
NameError("undefined method `%s' for `%s'",
rb_id2name(mid), rb_class2name(klass));
}
if (origin == klass) {
body->nd_noex |= NOEX_UNDEF;
}
else {
rb_clear_cache_by_id(mid);
rb_add_method(the_class, mid, 0, NOEX_UNDEF);
}
}
void
rb_enable_super(klass, name)
VALUE klass;
char *name;
{
VALUE origin;
NODE *body;
ID mid = rb_intern(name);
body = search_method(klass, mid, &origin);
if (!body || !body->nd_body || origin != klass) {
NameError("undefined method `%s' for `%s'",
rb_id2name(mid), rb_class2name(klass));
}
body->nd_noex &= ~NOEX_UNDEF;
}
static void
rb_export_method(klass, name, noex)
VALUE klass;
ID name;
int noex;
{
NODE *body;
VALUE origin;
body = search_method(klass, name, &origin);
if (!body && TYPE(klass) == T_MODULE) {
body = search_method(cObject, name, &origin);
}
if (!body) {
NameError("undefined method `%s' for `%s'",
rb_id2name(name), rb_class2name(klass));
}
if (body->nd_noex != noex) {
if (klass == origin) {
body->nd_noex = noex;
}
else {
rb_clear_cache_by_id(name);
rb_add_method(klass, name, NEW_ZSUPER(), noex);
}
}
}
int
rb_method_boundp(klass, id, ex)
VALUE klass;
ID id;
int ex;
{
int noex;
if (rb_get_method_body(&klass, &id, &noex)) {
if (ex && noex & NOEX_PRIVATE)
return FALSE;
return TRUE;
}
return FALSE;
}
void
rb_attr(klass, id, read, write, ex)
VALUE klass;
ID id;
int read, write, ex;
{
char *name;
char *buf;
ID attr, attreq, attriv;
int noex;
if (!ex) noex = NOEX_PUBLIC;
else {
if (SCOPE_TEST(SCOPE_PRIVATE)) {
noex = NOEX_PRIVATE;
Warning("private attribute?");
}
else if (SCOPE_TEST(SCOPE_PROTECTED)) {
noex = NOEX_PROTECTED;
}
else {
noex = NOEX_PUBLIC;
}
}
name = rb_id2name(id);
attr = rb_intern(name);
buf = ALLOCA_N(char,strlen(name)+2);
sprintf(buf, "%s=", name);
attreq = rb_intern(buf);
sprintf(buf, "@%s", name);
attriv = rb_intern(buf);
if (read) {
rb_add_method(klass, attr, NEW_IVAR(attriv), noex);
}
if (write) {
rb_add_method(klass, attreq, NEW_ATTRSET(attriv), noex);
}
}
static ID init, eqq, each, aref, aset, match;
VALUE errinfo = Qnil;
extern NODE *eval_tree0;
extern NODE *eval_tree;
extern int nerrs;
extern VALUE mKernel;
extern VALUE cModule;
extern VALUE eFatal;
extern VALUE eStandardError;
extern VALUE eInterrupt;
extern VALUE eSystemExit;
extern VALUE eException;
extern VALUE eRuntimeError;
extern VALUE eSyntaxError;
static VALUE eLocalJumpError;
static VALUE eSysStackError;
extern VALUE eSecurityError;
extern VALUE TopSelf;
struct FRAME *the_frame;
struct SCOPE *the_scope;
static struct FRAME *top_frame;
static struct SCOPE *top_scope;
#define PUSH_FRAME() { \
struct FRAME _frame; \
_frame.prev = the_frame; \
_frame.file = sourcefile; \
_frame.line = sourceline; \
_frame.iter = the_iter->iter; \
_frame.cbase = the_frame->cbase; \
the_frame = &_frame; \
#define POP_FRAME() the_frame = _frame.prev; }
struct BLOCK {
NODE *var;
NODE *body;
VALUE self;
struct FRAME frame;
struct SCOPE *scope;
VALUE klass;
struct tag *tag;
int iter;
int vmode;
struct RVarmap *d_vars;
#ifdef THREAD
VALUE orig_thread;
#endif
struct BLOCK *prev;
};
static struct BLOCK *the_block;
#define PUSH_BLOCK(v,b) { \
struct BLOCK _block; \
_block.tag = prot_tag; \
_block.var = v; \
_block.body = b; \
_block.self = self; \
_block.frame = *the_frame; \
_block.klass = the_class; \
_block.frame.file = sourcefile; \
_block.frame.line = sourceline; \
_block.scope = the_scope; \
_block.d_vars = the_dyna_vars; \
_block.prev = the_block; \
_block.iter = the_iter->iter; \
_block.vmode = scope_vmode; \
the_block = &_block;
#define PUSH_BLOCK2(b) { \
struct BLOCK _block; \
_block = *b; \
_block.prev = the_block; \
the_block = &_block;
#define POP_BLOCK() \
the_block = _block.prev; \
}
struct RVarmap *the_dyna_vars;
#define PUSH_VARS() { \
struct RVarmap * volatile _old; \
_old = the_dyna_vars; \
the_dyna_vars = 0;
#define POP_VARS() \
the_dyna_vars = _old; \
}
static struct RVarmap*
new_dvar(id, value)
ID id;
VALUE value;
{
NEWOBJ(vars, struct RVarmap);
OBJSETUP(vars, 0, T_VARMAP);
vars->id = id;
vars->val = value;
vars->next = the_dyna_vars;
if (id == 0) {
vars->id = (ID)value;
vars->val = 0;
the_dyna_vars = vars;
}
else if (the_dyna_vars) {
vars->next = the_dyna_vars->next;
the_dyna_vars->next = vars;
}
return vars;
}
VALUE
dyna_var_defined(id)
ID id;
{
struct RVarmap *vars = the_dyna_vars;
while (vars) {
if (vars->id == id) return TRUE;
vars = vars->next;
}
return FALSE;
}
VALUE
dyna_var_ref(id)
ID id;
{
struct RVarmap *vars = the_dyna_vars;
while (vars) {
if (vars->id == id) {
return vars->val;
}
vars = vars->next;
}
return Qnil;
}
VALUE
dyna_var_asgn(id, value)
ID id;
VALUE value;
{
struct RVarmap *vars = the_dyna_vars;
if (id) {
while (vars) {
if (vars->id == id) {
vars->val = value;
return value;
}
vars = vars->next;
}
}
new_dvar(id, value);
return value;
}
struct iter {
int iter;
struct iter *prev;
};
static struct iter *the_iter;
#define ITER_NOT 0
#define ITER_PRE 1
#define ITER_CUR 2
#define PUSH_ITER(i) { \
struct iter _iter; \
_iter.prev = the_iter; \
_iter.iter = (i); \
the_iter = &_iter; \
#define POP_ITER() \
the_iter = _iter.prev; \
}
struct tag {
jmp_buf buf;
struct FRAME *frame;
struct iter *iter;
ID tag;
VALUE retval;
ID dst;
struct tag *prev;
};
static struct tag *prot_tag;
#define PUSH_TAG(ptag) { \
struct tag _tag; \
_tag.retval = Qnil; \
_tag.frame = the_frame; \
_tag.iter = the_iter; \
_tag.prev = prot_tag; \
_tag.retval = Qnil; \
_tag.tag = ptag; \
_tag.dst = 0; \
prot_tag = &_tag;
#define PROT_NONE 0
#define PROT_FUNC -1
#define PROT_THREAD -2
#define EXEC_TAG() setjmp(prot_tag->buf)
#define JUMP_TAG(st) { \
the_frame = prot_tag->frame; \
the_iter = prot_tag->iter; \
longjmp(prot_tag->buf,(st)); \
}
#define POP_TAG() \
if (_tag.prev) \
_tag.prev->retval = _tag.retval;\
prot_tag = _tag.prev; \
}
#define TAG_RETURN 0x1
#define TAG_BREAK 0x2
#define TAG_NEXT 0x3
#define TAG_RETRY 0x4
#define TAG_REDO 0x5
#define TAG_RAISE 0x6
#define TAG_THROW 0x7
#define TAG_FATAL 0x8
#define TAG_MASK 0xf
VALUE the_class;
#define PUSH_CLASS() { \
VALUE _class = the_class; \
#define POP_CLASS() the_class = _class; }
#define PUSH_SCOPE() { \
int volatile _vmode = scope_vmode; \
struct SCOPE * volatile _old; \
NEWOBJ(_scope, struct SCOPE); \
OBJSETUP(_scope, 0, T_SCOPE); \
_scope->local_tbl = 0; \
_scope->local_vars = 0; \
_scope->flag = 0; \
_old = the_scope; \
the_scope = _scope; \
scope_vmode = SCOPE_PUBLIC;
#define POP_SCOPE() \
if (the_scope->flag == SCOPE_ALLOCA) {\
the_scope->local_vars = 0;\
the_scope->local_tbl = 0;\
if (the_scope != top_scope)\
gc_force_recycle(the_scope);\
}\
else {\
the_scope->flag |= SCOPE_NOSTACK;\
}\
the_scope = _old;\
}
static VALUE rb_eval _((VALUE,NODE*));
static VALUE eval _((VALUE,VALUE,VALUE,char*,int));
static NODE *compile _((VALUE,char*));
static VALUE rb_call _((VALUE,VALUE,ID,int,VALUE*,int));
static VALUE module_setup _((VALUE,NODE*));
static VALUE massign _((VALUE,NODE*,VALUE));
static void assign _((VALUE,NODE*,VALUE));
static int safe_level = 0;
/* safe-level:
0 - strings from streams/environment/ARGV are tainted (default)
1 - no dangerous operation by tainted string
2 - some process operations prohibited
3 - all genetated strings are tainted
4 - no global variable value modification/no direct output
5 - no instance variable value modification
*/
int
rb_safe_level()
{
return safe_level;
}
void
rb_set_safe_level(level)
int level;
{
if (level > safe_level) {
safe_level = level;
}
}
static VALUE
safe_getter()
{
return INT2FIX(safe_level);
}
static void
safe_setter(val)
VALUE val;
{
int level = NUM2INT(val);
if (level < safe_level) {
Raise(eSecurityError, "tried to downgrade safe level from %d to %d",
safe_level, level);
}
safe_level = level;
}
void
rb_check_safe_str(x)
VALUE x;
{
if (TYPE(x)!= T_STRING) {
TypeError("wrong argument type %s (expected String)",
rb_class2name(CLASS_OF(x)));
}
if (str_tainted(x)) {
if (safe_level > 0){
Raise(eSecurityError, "Insecure operation - %s",
rb_id2name(the_frame->last_func));
}
Warning("Insecure operation - %s",
rb_id2name(the_frame->last_func));
}
}
void
rb_secure(level)
int level;
{
if (level <= safe_level) {
Raise(eSecurityError, "Insecure operation `%s' for level %d",
rb_id2name(the_frame->last_func), level);
}
}
extern int sourceline;
extern char *sourcefile;
static VALUE trace_func = 0;
static void call_trace_func _((char*,char*,int,VALUE,ID));
static void
error_pos()
{
if (sourcefile) {
if (the_frame->last_func) {
fprintf(stderr, "%s:%d:in `%s'", sourcefile, sourceline,
rb_id2name(the_frame->last_func));
}
else {
fprintf(stderr, "%s:%d", sourcefile, sourceline);
}
}
}
static VALUE
get_backtrace(info)
VALUE info;
{
if (NIL_P(info)) return Qnil;
return rb_funcall(info, rb_intern("backtrace"), 0);
}
static void
set_backtrace(info, bt)
VALUE info, bt;
{
rb_funcall(info, rb_intern("set_backtrace"), 1, bt);
}
static void
error_print()
{
VALUE errat;
VALUE eclass;
VALUE einfo;
if (NIL_P(errinfo)) return;
errat = get_backtrace(errinfo);
if (!NIL_P(errat)) {
VALUE mesg = RARRAY(errat)->ptr[0];
if (NIL_P(mesg)) error_pos();
else {
fwrite(RSTRING(mesg)->ptr, 1, RSTRING(mesg)->len, stderr);
}
}
eclass = CLASS_OF(errinfo);
einfo = obj_as_string(errinfo);
if (eclass == eRuntimeError && RSTRING(einfo)->len == 0) {
fprintf(stderr, ": unhandled exception\n");
}
else {
VALUE epath;
epath = rb_class_path(eclass);
if (RSTRING(einfo)->len == 0) {
fprintf(stderr, ": ");
fwrite(RSTRING(epath)->ptr, 1, RSTRING(epath)->len, stderr);
putc('\n', stderr);
}
else {
UCHAR *tail = 0;
int len = RSTRING(einfo)->len;
if (RSTRING(epath)->ptr[0] == '#') epath = 0;
if (tail = strchr(RSTRING(einfo)->ptr, '\n')) {
len = tail - RSTRING(einfo)->ptr;
tail++; /* skip newline */
}
fprintf(stderr, ": ");
fwrite(RSTRING(einfo)->ptr, 1, len, stderr);
if (epath) {
fprintf(stderr, " (");
fwrite(RSTRING(epath)->ptr, 1, RSTRING(epath)->len, stderr);
fprintf(stderr, ")\n");
}
if (tail) {
fwrite(tail, 1, RSTRING(einfo)->len-len-1, stderr);
putc('\n', stderr);
}
}
}
if (!NIL_P(errat)) {
int i;
struct RArray *ep = RARRAY(errat);
#define TRACE_MAX (TRACE_HEAD+TRACE_TAIL+5)
#define TRACE_HEAD 8
#define TRACE_TAIL 5
ep = RARRAY(errat);
for (i=1; i<ep->len; i++) {
fprintf(stderr, "\tfrom %s\n", RSTRING(ep->ptr[i])->ptr);
if (i == TRACE_HEAD && ep->len > TRACE_MAX) {
fprintf(stderr, "\t ... %d levels...\n",
ep->len - TRACE_HEAD - TRACE_TAIL);
i = ep->len - TRACE_TAIL;
}
}
}
}
#ifndef NT
extern char **environ;
#endif
char **origenviron;
void rb_call_inits _((void));
void init_stack _((void));
void init_heap _((void));
void Init_ext _((void));
void gc_call_finalizer_at_exit _((void));
void
ruby_init()
{
static struct FRAME frame;
static struct iter iter;
int state;
the_frame = top_frame = &frame;
the_iter = &iter;
origenviron = environ;
init_heap();
PUSH_SCOPE();
the_scope->local_vars = 0;
the_scope->local_tbl = 0;
top_scope = the_scope;
/* default visibility is private at toplevel */
SCOPE_SET(SCOPE_PRIVATE);
PUSH_TAG(PROT_NONE)
if ((state = EXEC_TAG()) == 0) {
rb_call_inits();
the_class = cObject;
the_frame->self = TopSelf;
the_frame->cbase = (VALUE)node_newnode(NODE_CREF,cObject,0,0);
rb_define_global_const("TOPLEVEL_BINDING", f_binding(TopSelf));
ruby_prog_init();
}
POP_TAG();
if (state) error_print();
POP_SCOPE();
the_scope = top_scope;
}
static int ext_init = 0;
void
ruby_options(argc, argv)
int argc;
char **argv;
{
int state;
PUSH_TAG(PROT_NONE)
if ((state = EXEC_TAG()) == 0) {
NODE *save;
ruby_process_options(argc, argv);
ext_init = 1; /* Init_ext() called in ruby_process_options */
save = eval_tree;
eval_tree = 0;
ruby_require_modules();
eval_tree = save;
}
POP_TAG();
if (state) {
error_print();
exit(1);
}
}
static VALUE
eval_node(self)
VALUE self;
{
VALUE result = Qnil;
NODE *tree;
if (eval_tree0) {
tree = eval_tree0;
eval_tree0 = 0;
rb_eval(self, tree);
}
if (!eval_tree) return Qnil;
tree = eval_tree;
eval_tree = 0;
result = rb_eval(self, tree);
return result;
}
int rb_in_eval;
#ifdef THREAD
static void thread_cleanup _((void));
static void thread_wait_other_threads _((void));
static VALUE thread_current _((void));
#endif
static int exit_status;
static void exec_end_proc _((void));
void
ruby_run()
{
int state;
static int ex;
if (nerrs > 0) exit(nerrs);
init_stack();
PUSH_TAG(PROT_NONE);
PUSH_ITER(ITER_NOT);
if ((state = EXEC_TAG()) == 0) {
if (!ext_init) Init_ext();
eval_node(TopSelf);
}
POP_ITER();
POP_TAG();
if (state && !ex) ex = state;
PUSH_TAG(PROT_NONE);
PUSH_ITER(ITER_NOT);
if ((state = EXEC_TAG()) == 0) {
rb_trap_exit();
#ifdef THREAD
thread_cleanup();
thread_wait_other_threads();
#endif
exec_end_proc();
gc_call_finalizer_at_exit();
}
else {
ex = state;
}
POP_ITER();
POP_TAG();
switch (ex & 0xf) {
case 0:
exit(0);
case TAG_RETURN:
error_pos();
fprintf(stderr, "unexpected return\n");
exit(1);
break;
case TAG_NEXT:
error_pos();
fprintf(stderr, "unexpected next\n");
exit(1);
break;
case TAG_BREAK:
error_pos();
fprintf(stderr, "unexpected break\n");
exit(1);
break;
case TAG_REDO:
error_pos();
fprintf(stderr, "unexpected redo\n");
exit(1);
break;
case TAG_RETRY:
error_pos();
fprintf(stderr, "retry outside of rescue clause\n");
exit(1);
break;
case TAG_RAISE:
case TAG_FATAL:
if (obj_is_kind_of(errinfo, eSystemExit)) {
exit(exit_status);
}
error_print();
exit(1);
break;
default:
Bug("Unknown longjmp status %d", ex);
break;
}
}
static void
compile_error(at)
char *at;
{
VALUE str;
char *mesg;
int len;
mesg = str2cstr(errinfo, &len);
nerrs = 0;
str = str_new2("compile error");