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vm_backtrace.c
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/**********************************************************************
vm_backtrace.c -
$Author: ko1 $
created at: Sun Jun 03 00:14:20 2012
Copyright (C) 1993-2012 Yukihiro Matsumoto
**********************************************************************/
#include "internal.h"
#include "ruby/debug.h"
#include "vm_core.h"
#include "eval_intern.h"
#include "iseq.h"
static VALUE rb_cBacktrace;
static VALUE rb_cBacktraceLocation;
static VALUE
id2str(ID id)
{
VALUE str = rb_id2str(id);
if (!str) return Qnil;
return str;
}
#define rb_id2str(id) id2str(id)
inline static int
calc_lineno(const rb_iseq_t *iseq, const VALUE *pc)
{
return rb_iseq_line_no(iseq, pc - iseq->iseq_encoded);
}
int
rb_vm_get_sourceline(const rb_control_frame_t *cfp)
{
int lineno = 0;
const rb_iseq_t *iseq = cfp->iseq;
if (RUBY_VM_NORMAL_ISEQ_P(iseq)) {
lineno = calc_lineno(cfp->iseq, cfp->pc);
}
return lineno;
}
typedef struct rb_backtrace_location_struct {
enum LOCATION_TYPE {
LOCATION_TYPE_ISEQ = 1,
LOCATION_TYPE_ISEQ_CALCED,
LOCATION_TYPE_CFUNC,
LOCATION_TYPE_IFUNC
} type;
union {
struct {
const rb_iseq_t *iseq;
union {
const VALUE *pc;
int lineno;
} lineno;
} iseq;
struct {
ID mid;
struct rb_backtrace_location_struct *prev_loc;
} cfunc;
} body;
} rb_backtrace_location_t;
struct valued_frame_info {
rb_backtrace_location_t *loc;
VALUE btobj;
};
static void
location_mark(void *ptr)
{
struct valued_frame_info *vfi = (struct valued_frame_info *)ptr;
rb_gc_mark(vfi->btobj);
}
static void
location_mark_entry(rb_backtrace_location_t *fi)
{
switch (fi->type) {
case LOCATION_TYPE_ISEQ:
case LOCATION_TYPE_ISEQ_CALCED:
rb_gc_mark(fi->body.iseq.iseq->self);
break;
case LOCATION_TYPE_CFUNC:
case LOCATION_TYPE_IFUNC:
default:
break;
}
}
static size_t
location_memsize(const void *ptr)
{
/* rb_backtrace_location_t *fi = (rb_backtrace_location_t *)ptr; */
return sizeof(rb_backtrace_location_t);
}
static const rb_data_type_t location_data_type = {
"frame_info",
{location_mark, RUBY_TYPED_DEFAULT_FREE, location_memsize,},
0, 0, RUBY_TYPED_FREE_IMMEDIATELY
};
static inline rb_backtrace_location_t *
location_ptr(VALUE locobj)
{
struct valued_frame_info *vloc;
GetCoreDataFromValue(locobj, struct valued_frame_info, vloc);
return vloc->loc;
}
static int
location_lineno(rb_backtrace_location_t *loc)
{
switch (loc->type) {
case LOCATION_TYPE_ISEQ:
loc->type = LOCATION_TYPE_ISEQ_CALCED;
return (loc->body.iseq.lineno.lineno = calc_lineno(loc->body.iseq.iseq, loc->body.iseq.lineno.pc));
case LOCATION_TYPE_ISEQ_CALCED:
return loc->body.iseq.lineno.lineno;
case LOCATION_TYPE_CFUNC:
if (loc->body.cfunc.prev_loc) {
return location_lineno(loc->body.cfunc.prev_loc);
}
return 0;
default:
rb_bug("location_lineno: unreachable");
UNREACHABLE;
}
}
/*
* Returns the line number of this frame.
*
* For example, using +caller_locations.rb+ from Thread::Backtrace::Location
*
* loc = c(0..1).first
* loc.lineno #=> 2
*/
static VALUE
location_lineno_m(VALUE self)
{
return INT2FIX(location_lineno(location_ptr(self)));
}
static VALUE
location_label(rb_backtrace_location_t *loc)
{
switch (loc->type) {
case LOCATION_TYPE_ISEQ:
case LOCATION_TYPE_ISEQ_CALCED:
return loc->body.iseq.iseq->location.label;
case LOCATION_TYPE_CFUNC:
return rb_id2str(loc->body.cfunc.mid);
case LOCATION_TYPE_IFUNC:
default:
rb_bug("location_label: unreachable");
UNREACHABLE;
}
}
/*
* Returns the label of this frame.
*
* Usually consists of method, class, module, etc names with decoration.
*
* Consider the following example:
*
* def foo
* puts caller_locations(0).first.label
*
* 1.times do
* puts caller_locations(0).first.label
*
* 1.times do
* puts caller_locations(0).first.label
* end
*
* end
* end
*
* The result of calling +foo+ is this:
*
* label: foo
* label: block in foo
* label: block (2 levels) in foo
*
*/
static VALUE
location_label_m(VALUE self)
{
return location_label(location_ptr(self));
}
static VALUE
location_base_label(rb_backtrace_location_t *loc)
{
switch (loc->type) {
case LOCATION_TYPE_ISEQ:
case LOCATION_TYPE_ISEQ_CALCED:
return loc->body.iseq.iseq->location.base_label;
case LOCATION_TYPE_CFUNC:
return rb_sym_to_s(ID2SYM(loc->body.cfunc.mid));
case LOCATION_TYPE_IFUNC:
default:
rb_bug("location_base_label: unreachable");
UNREACHABLE;
}
}
/*
* Returns the base label of this frame.
*
* Usually same as #label, without decoration.
*/
static VALUE
location_base_label_m(VALUE self)
{
return location_base_label(location_ptr(self));
}
static VALUE
location_path(rb_backtrace_location_t *loc)
{
switch (loc->type) {
case LOCATION_TYPE_ISEQ:
case LOCATION_TYPE_ISEQ_CALCED:
return loc->body.iseq.iseq->location.path;
case LOCATION_TYPE_CFUNC:
if (loc->body.cfunc.prev_loc) {
return location_path(loc->body.cfunc.prev_loc);
}
return Qnil;
case LOCATION_TYPE_IFUNC:
default:
rb_bug("location_path: unreachable");
UNREACHABLE;
}
}
/*
* Returns the file name of this frame.
*
* For example, using +caller_locations.rb+ from Thread::Backtrace::Location
*
* loc = c(0..1).first
* loc.path #=> caller_locations.rb
*/
static VALUE
location_path_m(VALUE self)
{
return location_path(location_ptr(self));
}
static VALUE
location_absolute_path(rb_backtrace_location_t *loc)
{
switch (loc->type) {
case LOCATION_TYPE_ISEQ:
case LOCATION_TYPE_ISEQ_CALCED:
return loc->body.iseq.iseq->location.absolute_path;
case LOCATION_TYPE_CFUNC:
if (loc->body.cfunc.prev_loc) {
return location_absolute_path(loc->body.cfunc.prev_loc);
}
return Qnil;
case LOCATION_TYPE_IFUNC:
default:
rb_bug("location_absolute_path: unreachable");
UNREACHABLE;
}
}
/*
* Returns the full file path of this frame.
*
* Same as #path, but includes the absolute path.
*/
static VALUE
location_absolute_path_m(VALUE self)
{
return location_absolute_path(location_ptr(self));
}
static VALUE
location_format(VALUE file, int lineno, VALUE name)
{
VALUE s = rb_enc_sprintf(rb_enc_compatible(file, name), "%s", RSTRING_PTR(file));
if (lineno != 0) {
rb_str_catf(s, ":%d", lineno);
}
rb_str_cat_cstr(s, ":in ");
if (NIL_P(name)) {
rb_str_cat_cstr(s, "unknown method");
}
else {
rb_str_catf(s, "`%s'", RSTRING_PTR(name));
}
return s;
}
static VALUE
location_to_str(rb_backtrace_location_t *loc)
{
VALUE file, name;
int lineno;
switch (loc->type) {
case LOCATION_TYPE_ISEQ:
file = loc->body.iseq.iseq->location.path;
name = loc->body.iseq.iseq->location.label;
lineno = loc->body.iseq.lineno.lineno = calc_lineno(loc->body.iseq.iseq, loc->body.iseq.lineno.pc);
loc->type = LOCATION_TYPE_ISEQ_CALCED;
break;
case LOCATION_TYPE_ISEQ_CALCED:
file = loc->body.iseq.iseq->location.path;
lineno = loc->body.iseq.lineno.lineno;
name = loc->body.iseq.iseq->location.label;
break;
case LOCATION_TYPE_CFUNC:
if (loc->body.cfunc.prev_loc) {
file = loc->body.cfunc.prev_loc->body.iseq.iseq->location.path;
lineno = location_lineno(loc->body.cfunc.prev_loc);
}
else {
rb_thread_t *th = GET_THREAD();
file = th->vm->progname ? th->vm->progname : ruby_engine_name;
lineno = INT2FIX(0);
}
name = rb_id2str(loc->body.cfunc.mid);
break;
case LOCATION_TYPE_IFUNC:
default:
rb_bug("location_to_str: unreachable");
}
return location_format(file, lineno, name);
}
/*
* Returns a Kernel#caller style string representing this frame.
*/
static VALUE
location_to_str_m(VALUE self)
{
return location_to_str(location_ptr(self));
}
/*
* Returns the same as calling +inspect+ on the string representation of
* #to_str
*/
static VALUE
location_inspect_m(VALUE self)
{
return rb_str_inspect(location_to_str(location_ptr(self)));
}
typedef struct rb_backtrace_struct {
rb_backtrace_location_t *backtrace;
rb_backtrace_location_t *backtrace_base;
int backtrace_size;
VALUE strary;
VALUE locary;
} rb_backtrace_t;
static void
backtrace_mark(void *ptr)
{
rb_backtrace_t *bt = (rb_backtrace_t *)ptr;
size_t i, s = bt->backtrace_size;
for (i=0; i<s; i++) {
location_mark_entry(&bt->backtrace[i]);
}
rb_gc_mark(bt->strary);
rb_gc_mark(bt->locary);
}
static void
backtrace_free(void *ptr)
{
rb_backtrace_t *bt = (rb_backtrace_t *)ptr;
if (bt->backtrace) ruby_xfree(bt->backtrace_base);
ruby_xfree(bt);
}
static size_t
backtrace_memsize(const void *ptr)
{
rb_backtrace_t *bt = (rb_backtrace_t *)ptr;
return sizeof(rb_backtrace_t) + sizeof(rb_backtrace_location_t) * bt->backtrace_size;
}
static const rb_data_type_t backtrace_data_type = {
"backtrace",
{backtrace_mark, backtrace_free, backtrace_memsize,},
0, 0, RUBY_TYPED_FREE_IMMEDIATELY
};
int
rb_backtrace_p(VALUE obj)
{
return rb_typeddata_is_kind_of(obj, &backtrace_data_type);
}
static VALUE
backtrace_alloc(VALUE klass)
{
rb_backtrace_t *bt;
VALUE obj = TypedData_Make_Struct(klass, rb_backtrace_t, &backtrace_data_type, bt);
return obj;
}
static void
backtrace_each(rb_thread_t *th,
void (*init)(void *arg, size_t size),
void (*iter_iseq)(void *arg, const rb_control_frame_t *cfp),
void (*iter_cfunc)(void *arg, const rb_control_frame_t *cfp, ID mid),
void *arg)
{
rb_control_frame_t *last_cfp = th->cfp;
rb_control_frame_t *start_cfp = RUBY_VM_END_CONTROL_FRAME(th);
rb_control_frame_t *cfp;
ptrdiff_t size, i;
/* <- start_cfp (end control frame)
* top frame (dummy)
* top frame (dummy)
* top frame <- start_cfp
* top frame
* ...
* 2nd frame <- lev:0
* current frame <- th->cfp
*/
start_cfp =
RUBY_VM_NEXT_CONTROL_FRAME(
RUBY_VM_NEXT_CONTROL_FRAME(start_cfp)); /* skip top frames */
if (start_cfp < last_cfp) {
size = 0;
}
else {
size = start_cfp - last_cfp + 1;
}
init(arg, size);
/* SDR(); */
for (i=0, cfp = start_cfp; i<size; i++, cfp = RUBY_VM_NEXT_CONTROL_FRAME(cfp)) {
/* fprintf(stderr, "cfp: %d\n", (rb_control_frame_t *)(th->stack + th->stack_size) - cfp); */
if (cfp->iseq) {
if (cfp->pc) {
iter_iseq(arg, cfp);
}
}
else if (RUBYVM_CFUNC_FRAME_P(cfp)) {
ID mid = cfp->me->def ? cfp->me->def->original_id : cfp->me->called_id;
iter_cfunc(arg, cfp, mid);
}
}
}
struct bt_iter_arg {
rb_backtrace_t *bt;
VALUE btobj;
rb_backtrace_location_t *prev_loc;
};
static void
bt_init(void *ptr, size_t size)
{
struct bt_iter_arg *arg = (struct bt_iter_arg *)ptr;
arg->btobj = backtrace_alloc(rb_cBacktrace);
GetCoreDataFromValue(arg->btobj, rb_backtrace_t, arg->bt);
arg->bt->backtrace_base = arg->bt->backtrace = ruby_xmalloc(sizeof(rb_backtrace_location_t) * size);
arg->bt->backtrace_size = 0;
}
static void
bt_iter_iseq(void *ptr, const rb_control_frame_t *cfp)
{
const rb_iseq_t *iseq = cfp->iseq;
const VALUE *pc = cfp->pc;
struct bt_iter_arg *arg = (struct bt_iter_arg *)ptr;
rb_backtrace_location_t *loc = &arg->bt->backtrace[arg->bt->backtrace_size++];
loc->type = LOCATION_TYPE_ISEQ;
loc->body.iseq.iseq = iseq;
loc->body.iseq.lineno.pc = pc;
arg->prev_loc = loc;
}
static void
bt_iter_cfunc(void *ptr, const rb_control_frame_t *cfp, ID mid)
{
struct bt_iter_arg *arg = (struct bt_iter_arg *)ptr;
rb_backtrace_location_t *loc = &arg->bt->backtrace[arg->bt->backtrace_size++];
loc->type = LOCATION_TYPE_CFUNC;
loc->body.cfunc.mid = mid;
loc->body.cfunc.prev_loc = arg->prev_loc;
}
static VALUE
backtrace_object(rb_thread_t *th)
{
struct bt_iter_arg arg;
arg.prev_loc = 0;
backtrace_each(th,
bt_init,
bt_iter_iseq,
bt_iter_cfunc,
&arg);
return arg.btobj;
}
VALUE
rb_vm_backtrace_object(void)
{
return backtrace_object(GET_THREAD());
}
static VALUE
backtrace_collect(rb_backtrace_t *bt, long lev, long n, VALUE (*func)(rb_backtrace_location_t *, void *arg), void *arg)
{
VALUE btary;
int i;
if (UNLIKELY(lev < 0 || n < 0)) {
rb_bug("backtrace_collect: unreachable");
}
btary = rb_ary_new();
for (i=0; i+lev<bt->backtrace_size && i<n; i++) {
rb_backtrace_location_t *loc = &bt->backtrace[bt->backtrace_size - 1 - (lev+i)];
rb_ary_push(btary, func(loc, arg));
}
return btary;
}
static VALUE
location_to_str_dmyarg(rb_backtrace_location_t *loc, void *dmy)
{
return location_to_str(loc);
}
static VALUE
backtrace_to_str_ary(VALUE self, long lev, long n)
{
rb_backtrace_t *bt;
int size;
VALUE r;
GetCoreDataFromValue(self, rb_backtrace_t, bt);
size = bt->backtrace_size;
if (n == 0) {
n = size;
}
if (lev > size) {
return Qnil;
}
r = backtrace_collect(bt, lev, n, location_to_str_dmyarg, 0);
RB_GC_GUARD(self);
return r;
}
VALUE
rb_backtrace_to_str_ary(VALUE self)
{
rb_backtrace_t *bt;
GetCoreDataFromValue(self, rb_backtrace_t, bt);
if (!bt->strary) {
bt->strary = backtrace_to_str_ary(self, 0, bt->backtrace_size);
}
return bt->strary;
}
static VALUE
location_create(rb_backtrace_location_t *srcloc, void *btobj)
{
VALUE obj;
struct valued_frame_info *vloc;
obj = TypedData_Make_Struct(rb_cBacktraceLocation, struct valued_frame_info, &location_data_type, vloc);
vloc->loc = srcloc;
vloc->btobj = (VALUE)btobj;
return obj;
}
static VALUE
backtrace_to_location_ary(VALUE self, long lev, long n)
{
rb_backtrace_t *bt;
int size;
VALUE r;
GetCoreDataFromValue(self, rb_backtrace_t, bt);
size = bt->backtrace_size;
if (n == 0) {
n = size;
}
if (lev > size) {
return Qnil;
}
r = backtrace_collect(bt, lev, n, location_create, (void *)self);
RB_GC_GUARD(self);
return r;
}
VALUE
rb_backtrace_to_location_ary(VALUE self)
{
rb_backtrace_t *bt;
GetCoreDataFromValue(self, rb_backtrace_t, bt);
if (!bt->locary) {
bt->locary = backtrace_to_location_ary(self, 0, 0);
}
return bt->locary;
}
static VALUE
backtrace_dump_data(VALUE self)
{
VALUE str = rb_backtrace_to_str_ary(self);
return str;
}
static VALUE
backtrace_load_data(VALUE self, VALUE str)
{
rb_backtrace_t *bt;
GetCoreDataFromValue(self, rb_backtrace_t, bt);
bt->strary = str;
return self;
}
VALUE
rb_vm_backtrace_str_ary(rb_thread_t *th, long lev, long n)
{
return backtrace_to_str_ary(backtrace_object(th), lev, n);
}
VALUE
rb_vm_backtrace_location_ary(rb_thread_t *th, long lev, long n)
{
return backtrace_to_location_ary(backtrace_object(th), lev, n);
}
/* make old style backtrace directly */
struct oldbt_arg {
VALUE filename;
int lineno;
void (*func)(void *data, VALUE file, int lineno, VALUE name);
void *data; /* result */
};
static void
oldbt_init(void *ptr, size_t dmy)
{
struct oldbt_arg *arg = (struct oldbt_arg *)ptr;
rb_thread_t *th = GET_THREAD();
arg->filename = th->vm->progname ? th->vm->progname : ruby_engine_name;;
arg->lineno = 0;
}
static void
oldbt_iter_iseq(void *ptr, const rb_control_frame_t *cfp)
{
const rb_iseq_t *iseq = cfp->iseq;
const VALUE *pc = cfp->pc;
struct oldbt_arg *arg = (struct oldbt_arg *)ptr;
VALUE file = arg->filename = iseq->location.path;
VALUE name = iseq->location.label;
int lineno = arg->lineno = calc_lineno(iseq, pc);
(arg->func)(arg->data, file, lineno, name);
}
static void
oldbt_iter_cfunc(void *ptr, const rb_control_frame_t *cfp, ID mid)
{
struct oldbt_arg *arg = (struct oldbt_arg *)ptr;
VALUE file = arg->filename;
VALUE name = rb_id2str(mid);
int lineno = arg->lineno;
(arg->func)(arg->data, file, lineno, name);
}
static void
oldbt_print(void *data, VALUE file, int lineno, VALUE name)
{
FILE *fp = (FILE *)data;
if (NIL_P(name)) {
fprintf(fp, "\tfrom %s:%d:in unknown method\n",
RSTRING_PTR(file), lineno);
}
else {
fprintf(fp, "\tfrom %s:%d:in `%s'\n",
RSTRING_PTR(file), lineno, RSTRING_PTR(name));
}
}
static void
vm_backtrace_print(FILE *fp)
{
struct oldbt_arg arg;
arg.func = oldbt_print;
arg.data = (void *)fp;
backtrace_each(GET_THREAD(),
oldbt_init,
oldbt_iter_iseq,
oldbt_iter_cfunc,
&arg);
}
static void
oldbt_bugreport(void *arg, VALUE file, int line, VALUE method)
{
const char *filename = NIL_P(file) ? "ruby" : RSTRING_PTR(file);
if (!*(int *)arg) {
fprintf(stderr, "-- Ruby level backtrace information "
"----------------------------------------\n");
*(int *)arg = 1;
}
if (NIL_P(method)) {
fprintf(stderr, "%s:%d:in unknown method\n", filename, line);
}
else {
fprintf(stderr, "%s:%d:in `%s'\n", filename, line, RSTRING_PTR(method));
}
}
void
rb_backtrace_print_as_bugreport(void)
{
struct oldbt_arg arg;
int i = 0;
arg.func = oldbt_bugreport;
arg.data = (int *)&i;
backtrace_each(GET_THREAD(),
oldbt_init,
oldbt_iter_iseq,
oldbt_iter_cfunc,
&arg);
}
void
rb_backtrace(void)
{
vm_backtrace_print(stderr);
}
static void
oldbt_print_to(void *data, VALUE file, int lineno, VALUE name)
{
VALUE output = (VALUE)data;
VALUE str = rb_sprintf("\tfrom %"PRIsVALUE":%d:in ", file, lineno);
if (NIL_P(name)) {
rb_str_cat2(str, "unknown method\n");
}
else {
rb_str_catf(str, " `%"PRIsVALUE"'\n", name);
}
rb_io_write(output, str);
}
void
rb_backtrace_print_to(VALUE output)
{
struct oldbt_arg arg;
arg.func = oldbt_print_to;
arg.data = (void *)output;
backtrace_each(GET_THREAD(),
oldbt_init,
oldbt_iter_iseq,
oldbt_iter_cfunc,
&arg);
}
VALUE
rb_make_backtrace(void)
{
return rb_vm_backtrace_str_ary(GET_THREAD(), 0, 0);
}
static VALUE
vm_backtrace_to_ary(rb_thread_t *th, int argc, const VALUE *argv, int lev_default, int lev_plus, int to_str)
{
VALUE level, vn;
long lev, n;
VALUE btval = backtrace_object(th);
VALUE r;
rb_backtrace_t *bt;
GetCoreDataFromValue(btval, rb_backtrace_t, bt);
rb_scan_args(argc, argv, "02", &level, &vn);
if (argc == 2 && NIL_P(vn)) argc--;
switch (argc) {
case 0:
lev = lev_default + lev_plus;
n = bt->backtrace_size - lev;
break;
case 1:
{
long beg, len;
switch (rb_range_beg_len(level, &beg, &len, bt->backtrace_size - lev_plus, 0)) {
case Qfalse:
lev = NUM2LONG(level);
if (lev < 0) {
rb_raise(rb_eArgError, "negative level (%ld)", lev);
}
lev += lev_plus;
n = bt->backtrace_size - lev;
break;
case Qnil:
return Qnil;
default:
lev = beg + lev_plus;
n = len;
break;
}
break;
}
case 2:
lev = NUM2LONG(level);
n = NUM2LONG(vn);
if (lev < 0) {
rb_raise(rb_eArgError, "negative level (%ld)", lev);
}
if (n < 0) {
rb_raise(rb_eArgError, "negative size (%ld)", n);
}
lev += lev_plus;
break;
default:
lev = n = 0; /* to avoid warning */
break;
}
if (n == 0) {
return rb_ary_new();
}
if (to_str) {
r = backtrace_to_str_ary(btval, lev, n);
}
else {
r = backtrace_to_location_ary(btval, lev, n);
}
RB_GC_GUARD(btval);
return r;
}
static VALUE
thread_backtrace_to_ary(int argc, const VALUE *argv, VALUE thval, int to_str)
{
rb_thread_t *th;
GetThreadPtr(thval, th);
if (th->to_kill || th->status == THREAD_KILLED)
return Qnil;
return vm_backtrace_to_ary(th, argc, argv, 0, 0, to_str);
}
VALUE
rb_vm_thread_backtrace(int argc, const VALUE *argv, VALUE thval)
{
return thread_backtrace_to_ary(argc, argv, thval, 1);
}
VALUE
rb_vm_thread_backtrace_locations(int argc, const VALUE *argv, VALUE thval)
{
return thread_backtrace_to_ary(argc, argv, thval, 0);
}
/*
* call-seq:
* caller(start=1, length=nil) -> array or nil
* caller(range) -> array or nil
*
* Returns the current execution stack---an array containing strings in
* the form <code>file:line</code> or <code>file:line: in
* `method'</code>.
*
* The optional _start_ parameter determines the number of initial stack
* entries to omit from the top of the stack.
*
* A second optional +length+ parameter can be used to limit how many entries
* are returned from the stack.
*
* Returns +nil+ if _start_ is greater than the size of
* current execution stack.
*
* Optionally you can pass a range, which will return an array containing the
* entries within the specified range.
*
* def a(skip)
* caller(skip)
* end
* def b(skip)
* a(skip)
* end
* def c(skip)
* b(skip)
* end
* c(0) #=> ["prog:2:in `a'", "prog:5:in `b'", "prog:8:in `c'", "prog:10:in `<main>'"]
* c(1) #=> ["prog:5:in `b'", "prog:8:in `c'", "prog:11:in `<main>'"]
* c(2) #=> ["prog:8:in `c'", "prog:12:in `<main>'"]
* c(3) #=> ["prog:13:in `<main>'"]
* c(4) #=> []
* c(5) #=> nil
*/
static VALUE
rb_f_caller(int argc, VALUE *argv)
{
return vm_backtrace_to_ary(GET_THREAD(), argc, argv, 1, 1, 1);
}
/*
* call-seq:
* caller_locations(start=1, length=nil) -> array or nil
* caller_locations(range) -> array or nil
*
* Returns the current execution stack---an array containing
* backtrace location objects.
*
* See Thread::Backtrace::Location for more information.
*
* The optional _start_ parameter determines the number of initial stack
* entries to omit from the top of the stack.
*
* A second optional +length+ parameter can be used to limit how many entries
* are returned from the stack.
*
* Returns +nil+ if _start_ is greater than the size of
* current execution stack.
*
* Optionally you can pass a range, which will return an array containing the
* entries within the specified range.
*/
static VALUE
rb_f_caller_locations(int argc, VALUE *argv)
{
return vm_backtrace_to_ary(GET_THREAD(), argc, argv, 1, 1, 0);
}
/* called from Init_vm() in vm.c */
void
Init_vm_backtrace(void)
{
/* :nodoc: */
rb_cBacktrace = rb_define_class_under(rb_cThread, "Backtrace", rb_cObject);
rb_define_alloc_func(rb_cBacktrace, backtrace_alloc);
rb_undef_method(CLASS_OF(rb_cBacktrace), "new");
rb_marshal_define_compat(rb_cBacktrace, rb_cArray, backtrace_dump_data, backtrace_load_data);
/*
* An object representation of a stack frame, initialized by
* Kernel#caller_locations.
*
* For example:
*
* # caller_locations.rb
* def a(skip)