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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) 1993-2002 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby.h"
#include "node.h"
#include "env.h"
#include "util.h"
#include "rubysig.h"
#include <stdio.h>
#include <setjmp.h>
#include "st.h"
#include "dln.h"
/* Make alloca work the best possible way. */
#ifdef __GNUC__
# ifndef atarist
# ifndef alloca
# define alloca __builtin_alloca
# endif
# endif /* atarist */
#else
# if defined(HAVE_ALLOCA_H)
# include <alloca.h>
# elif !defined(alloca)
char *alloca();
# endif
#endif /* __GNUC__ */
#ifdef _AIX
#pragma alloca
#endif
#ifdef HAVE_STDARG_PROTOTYPES
#include <stdarg.h>
#define va_init_list(a,b) va_start(a,b)
#else
#include <varargs.h>
#define va_init_list(a,b) va_start(a)
#endif
#ifndef HAVE_STRING_H
char *strrchr _((const char*,const char));
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef __BEOS__
#include <net/socket.h>
#endif
#ifdef __MACOS__
#include "macruby_private.h"
#endif
#ifndef setjmp
#ifdef HAVE__SETJMP
#define setjmp(env) _setjmp(env)
#define longjmp(env,val) _longjmp(env,val)
#endif
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#else
#ifndef NT
struct timeval {
long tv_sec; /* seconds */
long tv_usec; /* and microseconds */
};
#endif /* NT */
#endif
#include <signal.h>
#include <errno.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <sys/stat.h>
VALUE rb_cProc;
static VALUE rb_cBinding;
static VALUE proc_invoke _((VALUE,VALUE,int,VALUE));
static VALUE rb_f_binding _((VALUE));
static void rb_f_END _((void));
static VALUE rb_f_block_given_p _((void));
static VALUE block_pass _((VALUE,NODE*));
static VALUE rb_cMethod;
static VALUE method_proc _((VALUE));
static VALUE method_call _((int, VALUE*, VALUE));
static VALUE rb_cUnboundMethod;
static VALUE umethod_bind _((VALUE, VALUE));
static VALUE rb_mod_define_method _((int, VALUE*, 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))
int ruby_safe_level = 0;
/* safe-level:
0 - strings from streams/environment/ARGV are tainted (default)
1 - no dangerous operation by tainted value
2 - process/file operations prohibited
3 - all genetated objects are tainted
4 - no global (non-tainted) variable modification/no direct output
*/
static VALUE safe_getter _((void));
static void safe_setter _((VALUE val));
void
rb_secure(level)
int level;
{
if (level <= ruby_safe_level) {
rb_raise(rb_eSecurityError, "Insecure operation `%s' at level %d",
rb_id2name(ruby_frame->last_func), ruby_safe_level);
}
}
void
rb_check_safe_str(x)
VALUE x;
{
if (ruby_safe_level > 0 && OBJ_TAINTED(x)){
if (ruby_frame->last_func) {
rb_raise(rb_eSecurityError, "Insecure operation - %s",
rb_id2name(ruby_frame->last_func));
}
else {
rb_raise(rb_eSecurityError, "Insecure operation: -r");
}
}
rb_secure(4);
if (TYPE(x)!= T_STRING) {
rb_raise(rb_eTypeError, "wrong argument type %s (expected String)",
rb_class2name(CLASS_OF(x)));
}
}
NORETURN(static void print_undef _((VALUE, ID)));
static void
print_undef(klass, id)
VALUE klass;
ID id;
{
rb_name_error(id, "undefined method `%s' for %s `%s'",
rb_id2name(id),
(TYPE(klass) == T_MODULE) ? "module" : "class",
rb_class2name(klass));
}
static ID removed, singleton_removed, undefined, singleton_undefined;
#define CACHE_SIZE 0x800
#define CACHE_MASK 0x7ff
#define EXPR1(c,m) ((((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 = rb_cObject;
if (rb_safe_level() >= 4 && (klass == rb_cObject || !OBJ_TAINTED(klass))) {
rb_raise(rb_eSecurityError, "Insecure: can't define method");
}
if (OBJ_FROZEN(klass)) rb_error_frozen("class/module");
rb_clear_cache_by_id(mid);
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;
if (!klass) return 0;
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 * volatile body;
struct cache_entry *ent;
if ((body = search_method(klass, id, &origin)) == 0 || !body->nd_body) {
/* store empty info in cache */
ent = cache + EXPR1(klass, id);
ent->klass = klass;
ent->origin = klass;
ent->mid = ent->mid0 = id;
ent->noex = 0;
ent->method = 0;
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;
}
static void
remove_method(klass, mid)
VALUE klass;
ID mid;
{
NODE *body;
if (klass == rb_cObject) {
rb_secure(4);
}
if (rb_safe_level() >= 4 && !OBJ_TAINTED(klass)) {
rb_raise(rb_eSecurityError, "Insecure: can't remove method");
}
if (OBJ_FROZEN(klass)) rb_error_frozen("class/module");
if (!st_delete(RCLASS(klass)->m_tbl, &mid, &body) || !body->nd_body) {
rb_name_error(mid, "method `%s' not defined in %s",
rb_id2name(mid), rb_class2name(klass));
}
rb_clear_cache_by_id(mid);
if (FL_TEST(klass, FL_SINGLETON)) {
rb_funcall(rb_iv_get(klass, "__attached__"), singleton_removed, 1, ID2SYM(mid));
}
else {
rb_funcall(klass, removed, 1, ID2SYM(mid));
}
}
void
rb_remove_method(klass, name)
VALUE klass;
const char *name;
{
remove_method(klass, rb_intern(name));
}
static VALUE
rb_mod_remove_method(mod, name)
VALUE mod, name;
{
remove_method(mod, rb_to_id(name));
return mod;
}
void
rb_disable_super(klass, name)
VALUE klass;
const char *name;
{
VALUE origin;
NODE *body;
ID mid = rb_intern(name);
body = search_method(klass, mid, &origin);
if (!body || !body->nd_body) {
print_undef(klass, mid);
}
if (origin == klass) {
body->nd_noex |= NOEX_UNDEF;
}
else {
rb_add_method(klass, mid, 0, NOEX_UNDEF);
}
}
void
rb_enable_super(klass, name)
VALUE klass;
const char *name;
{
VALUE origin;
NODE *body;
ID mid = rb_intern(name);
body = search_method(klass, mid, &origin);
if (!body) {
print_undef(klass, mid);
}
if (!body->nd_body) {
remove_method(klass, mid);
}
else {
body->nd_noex &= ~NOEX_UNDEF;
}
}
static void
rb_export_method(klass, name, noex)
VALUE klass;
ID name;
ID noex;
{
NODE *body;
VALUE origin;
if (klass == rb_cObject) {
rb_secure(4);
}
body = search_method(klass, name, &origin);
if (!body && TYPE(klass) == T_MODULE) {
body = search_method(rb_cObject, name, &origin);
}
if (!body) {
print_undef(klass, name);
}
if (body->nd_noex != noex) {
if (klass == origin) {
body->nd_noex = noex;
}
else {
rb_add_method(klass, name, NEW_ZSUPER(), noex);
}
}
}
int
rb_method_boundp(klass, id, ex)
VALUE klass;
ID id;
int ex;
{
struct cache_entry *ent;
int noex;
/* is it in the method cache? */
ent = cache + EXPR1(klass, id);
if (ent->mid == id && ent->klass == klass) {
if (ex && (ent->noex & NOEX_PRIVATE))
return Qfalse;
if (!ent->method) return Qfalse;
return Qtrue;
}
if (rb_get_method_body(&klass, &id, &noex)) {
if (ex && (noex & NOEX_PRIVATE))
return Qfalse;
return Qtrue;
}
return Qfalse;
}
static ID init, alloc, eqq, each, aref, aset, match, to_ary, missing;
static ID added, singleton_added;
static ID __id__, __send__;
void
rb_attr(klass, id, read, write, ex)
VALUE klass;
ID id;
int read, write, ex;
{
const char *name;
char *buf;
ID attriv;
int noex;
if (!ex) noex = NOEX_PUBLIC;
else {
if (SCOPE_TEST(SCOPE_PRIVATE)) {
noex = NOEX_PRIVATE;
rb_warning((scope_vmode == SCOPE_MODFUNC) ?
"attribute accessor as module_function" :
"private attribute?");
}
else if (SCOPE_TEST(SCOPE_PROTECTED)) {
noex = NOEX_PROTECTED;
}
else {
noex = NOEX_PUBLIC;
}
}
name = rb_id2name(id);
if (!name) {
rb_raise(rb_eArgError, "argument needs to be symbol or string");
}
buf = ALLOCA_N(char,strlen(name)+2);
sprintf(buf, "@%s", name);
attriv = rb_intern(buf);
if (read) {
rb_add_method(klass, id, NEW_IVAR(attriv), noex);
rb_funcall(klass, added, 1, ID2SYM(id));
}
if (write) {
sprintf(buf, "%s=", name);
id = rb_intern(buf);
rb_add_method(klass, id, NEW_ATTRSET(attriv), noex);
rb_funcall(klass, added, 1, ID2SYM(id));
}
}
extern int ruby_in_compile;
VALUE ruby_errinfo = Qnil;
extern NODE *ruby_eval_tree_begin;
extern NODE *ruby_eval_tree;
extern int ruby_nerrs;
static VALUE rb_eLocalJumpError;
static VALUE rb_eSysStackError;
extern VALUE ruby_top_self;
struct FRAME *ruby_frame;
struct SCOPE *ruby_scope;
static struct FRAME *top_frame;
static struct SCOPE *top_scope;
#define PUSH_FRAME() { \
struct FRAME _frame; \
_frame.prev = ruby_frame; \
_frame.tmp = 0; \
_frame.file = ruby_sourcefile; \
_frame.line = ruby_sourceline; \
_frame.iter = ruby_iter->iter; \
_frame.cbase = ruby_frame->cbase; \
_frame.argc = 0; \
_frame.argv = 0; \
_frame.flags = FRAME_ALLOCA; \
ruby_frame = &_frame; \
#define POP_FRAME() \
ruby_sourcefile = _frame.file; \
ruby_sourceline = _frame.line; \
ruby_frame = _frame.prev; }
struct BLOCKTAG {
struct RBasic super;
long dst;
long flags;
};
struct BLOCK {
NODE *var;
NODE *body;
VALUE self;
struct FRAME frame;
struct SCOPE *scope;
struct BLOCKTAG *tag;
VALUE klass;
int iter;
int vmode;
int flags;
struct RVarmap *dyna_vars;
VALUE orig_thread;
VALUE wrapper;
struct BLOCK *prev;
};
#define BLOCK_D_SCOPE 1
#define BLOCK_DYNAMIC 2
#define BLOCK_ORPHAN 4
static struct BLOCK *ruby_block;
static struct BLOCKTAG*
new_blktag()
{
NEWOBJ(blktag, struct BLOCKTAG);
OBJSETUP(blktag, 0, T_BLKTAG);
blktag->dst = 0;
blktag->flags = 0;
return blktag;
}
#define PUSH_BLOCK(v,b) { \
struct BLOCK _block; \
_block.tag = new_blktag(); \
_block.var = v; \
_block.body = b; \
_block.self = self; \
_block.frame = *ruby_frame; \
_block.klass = ruby_class; \
_block.frame.file = ruby_sourcefile;\
_block.frame.line = ruby_sourceline;\
_block.scope = ruby_scope; \
_block.prev = ruby_block; \
_block.iter = ruby_iter->iter; \
_block.vmode = scope_vmode; \
_block.flags = BLOCK_D_SCOPE; \
_block.dyna_vars = ruby_dyna_vars; \
_block.wrapper = ruby_wrapper; \
ruby_block = &_block;
#define POP_BLOCK() \
if (_block.tag->flags & (BLOCK_DYNAMIC)) \
_block.tag->flags |= BLOCK_ORPHAN; \
else if (!(_block.scope->flags & SCOPE_DONT_RECYCLE)) \
rb_gc_force_recycle((VALUE)_block.tag); \
ruby_block = _block.prev; \
}
struct RVarmap *ruby_dyna_vars;
#define PUSH_VARS() { \
struct RVarmap * volatile _old; \
_old = ruby_dyna_vars; \
ruby_dyna_vars = 0;
#define POP_VARS() \
if (_old && (ruby_scope->flags & SCOPE_DONT_RECYCLE)) {\
if (RBASIC(_old)->flags) /* unless it's already recycled */ \
FL_SET(_old, DVAR_DONT_RECYCLE); \
}\
ruby_dyna_vars = _old; \
}
#define DVAR_DONT_RECYCLE FL_USER2
static struct RVarmap*
new_dvar(id, value, prev)
ID id;
VALUE value;
struct RVarmap *prev;
{
NEWOBJ(vars, struct RVarmap);
OBJSETUP(vars, 0, T_VARMAP);
vars->id = id;
vars->val = value;
vars->next = prev;
return vars;
}
VALUE
rb_dvar_defined(id)
ID id;
{
struct RVarmap *vars = ruby_dyna_vars;
while (vars) {
if (vars->id == id) return Qtrue;
vars = vars->next;
}
return Qfalse;
}
VALUE
rb_dvar_curr(id)
ID id;
{
struct RVarmap *vars = ruby_dyna_vars;
while (vars) {
if (vars->id == 0) break;
if (vars->id == id) return Qtrue;
vars = vars->next;
}
return Qfalse;
}
VALUE
rb_dvar_ref(id)
ID id;
{
struct RVarmap *vars = ruby_dyna_vars;
while (vars) {
if (vars->id == id) {
return vars->val;
}
vars = vars->next;
}
return Qnil;
}
void
rb_dvar_push(id, value)
ID id;
VALUE value;
{
ruby_dyna_vars = new_dvar(id, value, ruby_dyna_vars);
}
static void
dvar_asgn_internal(id, value, curr)
ID id;
VALUE value;
int curr;
{
int n = 0;
struct RVarmap *vars = ruby_dyna_vars;
while (vars) {
if (curr && vars->id == 0) {
/* first null is a dvar header */
n++;
if (n == 2) break;
}
if (vars->id == id) {
vars->val = value;
return;
}
vars = vars->next;
}
if (!ruby_dyna_vars) {
ruby_dyna_vars = new_dvar(id, value, 0);
}
else {
vars = new_dvar(id, value, ruby_dyna_vars->next);
ruby_dyna_vars->next = vars;
}
}
static void
dvar_asgn(id, value)
ID id;
VALUE value;
{
dvar_asgn_internal(id, value, 0);
}
static void
dvar_asgn_curr(id, value)
ID id;
VALUE value;
{
dvar_asgn_internal(id, value, 1);
}
VALUE *
rb_svar(cnt)
int cnt;
{
struct RVarmap *vars = ruby_dyna_vars;
ID id;
if (!ruby_scope->local_tbl) return NULL;
if (cnt >= ruby_scope->local_tbl[0]) return NULL;
id = ruby_scope->local_tbl[cnt+1];
while (vars) {
if (vars->id == id) return &vars->val;
vars = vars->next;
}
if (ruby_scope->local_vars == 0) return NULL;
return &ruby_scope->local_vars[cnt];
}
struct iter {
int iter;
struct iter *prev;
};
static struct iter *ruby_iter;
#define ITER_NOT 0
#define ITER_PRE 1
#define ITER_CUR 2
#define PUSH_ITER(i) { \
struct iter _iter; \
_iter.prev = ruby_iter; \
_iter.iter = (i); \
ruby_iter = &_iter; \
#define POP_ITER() \
ruby_iter = _iter.prev; \
}
struct tag {
jmp_buf buf;
struct FRAME *frame;
struct iter *iter;
ID tag;
VALUE retval;
struct SCOPE *scope;
int dst;
struct tag *prev;
};
static struct tag *prot_tag;
#define PUSH_TAG(ptag) { \
struct tag _tag; \
_tag.retval = Qnil; \
_tag.frame = ruby_frame; \
_tag.iter = ruby_iter; \
_tag.prev = prot_tag; \
_tag.scope = ruby_scope; \
_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) { \
ruby_frame = prot_tag->frame; \
ruby_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 POP_TMPTAG() \
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 ruby_class;
static VALUE ruby_wrapper; /* security wrapper */
#define PUSH_CLASS() { \
VALUE _class = ruby_class; \
#define POP_CLASS() ruby_class = _class; }
static NODE *ruby_cref = 0;
static NODE *top_cref;
#define PUSH_CREF(c) ruby_cref = rb_node_newnode(NODE_CREF,(c),0,ruby_cref)
#define POP_CREF() ruby_cref = ruby_cref->nd_next
#define PUSH_SCOPE() { \
volatile int _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->flags = 0; \
_old = ruby_scope; \
ruby_scope = _scope; \
scope_vmode = SCOPE_PUBLIC;
typedef struct thread * rb_thread_t;
static rb_thread_t curr_thread = 0;
static rb_thread_t main_thread;
static void scope_dup _((struct SCOPE *));
#define POP_SCOPE() \
if (ruby_scope->flags & SCOPE_DONT_RECYCLE) {\
if (_old) scope_dup(_old); \
} \
if (!(ruby_scope->flags & SCOPE_MALLOC)) {\
ruby_scope->local_vars = 0; \
ruby_scope->local_tbl = 0; \
if (!(ruby_scope->flags & SCOPE_DONT_RECYCLE) && \
ruby_scope != top_scope) { \
rb_gc_force_recycle((VALUE)ruby_scope);\
} \
} \
ruby_scope->flags |= SCOPE_NOSTACK; \
ruby_scope = _old; \
scope_vmode = _vmode; \
}
static VALUE rb_eval _((VALUE,NODE*));
static VALUE eval _((VALUE,VALUE,VALUE,char*,int));
static NODE *compile _((VALUE, char*, int));
static VALUE rb_yield_0 _((VALUE, VALUE, VALUE, int));
static VALUE rb_call _((VALUE,VALUE,ID,int,VALUE*,int));
static VALUE module_setup _((VALUE,NODE*));
static VALUE massign _((VALUE,NODE*,VALUE,int));
static void assign _((VALUE,NODE*,VALUE,int));
static VALUE trace_func = 0;
static int tracing = 0;
static void call_trace_func _((char*,char*,int,VALUE,ID,VALUE));
static void
error_pos()
{
if (ruby_sourcefile) {
if (ruby_frame->last_func) {
fprintf(stderr, "%s:%d:in `%s'", ruby_sourcefile, ruby_sourceline,
rb_id2name(ruby_frame->last_func));
}
else if (ruby_sourceline == 0) {
fprintf(stderr, "%s", ruby_sourcefile);
}
else {
fprintf(stderr, "%s:%d", ruby_sourcefile, ruby_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 = Qnil; /* OK */
volatile VALUE eclass;
char *einfo;
int elen;
if (NIL_P(ruby_errinfo)) return;
PUSH_TAG(PROT_NONE);
if (EXEC_TAG() == 0) {
errat = get_backtrace(ruby_errinfo);
}
else {
errat = Qnil;
}
POP_TAG();
if (NIL_P(errat)){
if (ruby_sourcefile)
fprintf(stderr, "%s:%d", ruby_sourcefile, ruby_sourceline);
else
fprintf(stderr, "%d", ruby_sourceline);
}
else if (RARRAY(errat)->len == 0) {
error_pos();
}
else {
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(ruby_errinfo);
PUSH_TAG(PROT_NONE);
if (EXEC_TAG() == 0) {
VALUE e = rb_obj_as_string(ruby_errinfo);
einfo = RSTRING(e)->ptr;
elen = RSTRING(e)->len;
}
else {
einfo = "";
elen = 0;
}
POP_TAG();
if (eclass == rb_eRuntimeError && elen == 0) {
fprintf(stderr, ": unhandled exception\n");
}
else {
VALUE epath;
epath = rb_class_path(eclass);
if (elen == 0) {
fprintf(stderr, ": ");
fwrite(RSTRING(epath)->ptr, 1, RSTRING(epath)->len, stderr);
putc('\n', stderr);
}
else {
char *tail = 0;
int len = elen;
if (RSTRING(epath)->ptr[0] == '#') epath = 0;
if (tail = strchr(einfo, '\n')) {
len = tail - einfo;
tail++; /* skip newline */
}
fprintf(stderr, ": ");
fwrite(einfo, 1, len, stderr);
if (epath) {
fprintf(stderr, " (");
fwrite(RSTRING(epath)->ptr, 1, RSTRING(epath)->len, stderr);
fprintf(stderr, ")\n");
}
if (tail) {
fwrite(tail, 1, elen-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++) {
if (TYPE(ep->ptr[i]) == T_STRING) {
fprintf(stderr, "\tfrom %s\n", RSTRING(ep->ptr[i])->ptr);
}
if (i == TRACE_HEAD && ep->len > TRACE_MAX) {