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ruby/vm_backtrace.c

1999 строки
54 KiB
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 "eval_intern.h"
#include "internal.h"
#include "internal/class.h"
#include "internal/error.h"
#include "internal/vm.h"
#include "iseq.h"
#include "ruby/debug.h"
#include "ruby/encoding.h"
#include "vm_core.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)
#define BACKTRACE_START 0
#define ALL_BACKTRACE_LINES -1
inline static int
calc_pos(const rb_iseq_t *iseq, const VALUE *pc, int *lineno, int *node_id)
{
VM_ASSERT(iseq);
if (pc == NULL) {
if (ISEQ_BODY(iseq)->type == ISEQ_TYPE_TOP) {
VM_ASSERT(! ISEQ_BODY(iseq)->local_table);
VM_ASSERT(! ISEQ_BODY(iseq)->local_table_size);
return 0;
}
if (lineno) *lineno = ISEQ_BODY(iseq)->location.first_lineno;
#ifdef USE_ISEQ_NODE_ID
if (node_id) *node_id = -1;
#endif
return 1;
}
else {
VM_ASSERT(ISEQ_BODY(iseq));
VM_ASSERT(ISEQ_BODY(iseq)->iseq_encoded);
VM_ASSERT(ISEQ_BODY(iseq)->iseq_size);
ptrdiff_t n = pc - ISEQ_BODY(iseq)->iseq_encoded;
VM_ASSERT(n >= 0);
#if SIZEOF_PTRDIFF_T > SIZEOF_INT
VM_ASSERT(n <= (ptrdiff_t)UINT_MAX);
#endif
VM_ASSERT((unsigned int)n <= ISEQ_BODY(iseq)->iseq_size);
ASSUME(n >= 0);
size_t pos = n; /* no overflow */
if (LIKELY(pos)) {
/* use pos-1 because PC points next instruction at the beginning of instruction */
pos--;
}
#if VMDEBUG && defined(HAVE_BUILTIN___BUILTIN_TRAP)
else {
/* SDR() is not possible; that causes infinite loop. */
rb_print_backtrace(stderr);
__builtin_trap();
}
#endif
if (lineno) *lineno = rb_iseq_line_no(iseq, pos);
#ifdef USE_ISEQ_NODE_ID
if (node_id) *node_id = rb_iseq_node_id(iseq, pos);
#endif
return 1;
}
}
inline static int
calc_lineno(const rb_iseq_t *iseq, const VALUE *pc)
{
int lineno;
if (calc_pos(iseq, pc, &lineno, NULL)) return lineno;
return 0;
}
#ifdef USE_ISEQ_NODE_ID
inline static int
calc_node_id(const rb_iseq_t *iseq, const VALUE *pc)
{
int node_id;
if (calc_pos(iseq, pc, NULL, &node_id)) return node_id;
return -1;
}
#endif
int
rb_vm_get_sourceline(const rb_control_frame_t *cfp)
{
if (VM_FRAME_RUBYFRAME_P(cfp) && cfp->iseq) {
const rb_iseq_t *iseq = cfp->iseq;
int line = calc_lineno(iseq, cfp->pc);
if (line != 0) {
return line;
}
else {
return ISEQ_BODY(iseq)->location.first_lineno;
}
}
else {
return 0;
}
}
typedef struct rb_backtrace_location_struct {
const rb_callable_method_entry_t *cme;
const rb_iseq_t *iseq;
const VALUE *pc;
} 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_movable(vfi->btobj);
}
static void
location_ref_update(void *ptr)
{
struct valued_frame_info *vfi = ptr;
vfi->btobj = rb_gc_location(vfi->btobj);
}
static void
location_mark_entry(rb_backtrace_location_t *fi)
{
rb_gc_mark((VALUE)fi->cme);
if (fi->iseq) rb_gc_mark_movable((VALUE)fi->iseq);
}
static const rb_data_type_t location_data_type = {
"frame_info",
{
location_mark,
RUBY_TYPED_DEFAULT_FREE,
NULL, // No external memory to report,
location_ref_update,
},
0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_EMBEDDABLE
};
int
rb_frame_info_p(VALUE obj)
{
return rb_typeddata_is_kind_of(obj, &location_data_type);
}
static inline rb_backtrace_location_t *
location_ptr(VALUE locobj)
{
struct valued_frame_info *vloc;
TypedData_Get_Struct(locobj, struct valued_frame_info, &location_data_type, vloc);
return vloc->loc;
}
static int
location_lineno(rb_backtrace_location_t *loc)
{
if (loc->iseq) {
return calc_lineno(loc->iseq, loc->pc);
}
return 0;
}
/*
* 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)));
}
VALUE rb_mod_name0(VALUE klass, bool *permanent);
VALUE
rb_gen_method_name(VALUE owner, VALUE name)
{
bool permanent;
if (RB_TYPE_P(owner, T_CLASS) || RB_TYPE_P(owner, T_MODULE)) {
if (RCLASS_SINGLETON_P(owner)) {
VALUE v = RCLASS_ATTACHED_OBJECT(owner);
if (RB_TYPE_P(v, T_CLASS) || RB_TYPE_P(v, T_MODULE)) {
v = rb_mod_name0(v, &permanent);
if (permanent && !NIL_P(v)) {
return rb_sprintf("%"PRIsVALUE".%"PRIsVALUE, v, name);
}
}
}
else {
owner = rb_mod_name0(owner, &permanent);
if (permanent && !NIL_P(owner)) {
return rb_sprintf("%"PRIsVALUE"#%"PRIsVALUE, owner, name);
}
}
}
return name;
}
static VALUE
calculate_iseq_label(VALUE owner, const rb_iseq_t *iseq)
{
retry:
switch (ISEQ_BODY(iseq)->type) {
case ISEQ_TYPE_TOP:
case ISEQ_TYPE_CLASS:
case ISEQ_TYPE_MAIN:
return ISEQ_BODY(iseq)->location.label;
case ISEQ_TYPE_METHOD:
return rb_gen_method_name(owner, ISEQ_BODY(iseq)->location.label);
case ISEQ_TYPE_BLOCK:
case ISEQ_TYPE_PLAIN: {
int level = 0;
const rb_iseq_t *orig_iseq = iseq;
if (ISEQ_BODY(orig_iseq)->parent_iseq != 0) {
while (ISEQ_BODY(orig_iseq)->local_iseq != iseq) {
if (ISEQ_BODY(iseq)->type == ISEQ_TYPE_BLOCK) {
level++;
}
iseq = ISEQ_BODY(iseq)->parent_iseq;
}
}
if (level <= 1) {
return rb_sprintf("block in %"PRIsVALUE, calculate_iseq_label(owner, iseq));
}
else {
return rb_sprintf("block (%d levels) in %"PRIsVALUE, level, calculate_iseq_label(owner, iseq));
}
}
case ISEQ_TYPE_RESCUE:
case ISEQ_TYPE_ENSURE:
case ISEQ_TYPE_EVAL:
iseq = ISEQ_BODY(iseq)->parent_iseq;
goto retry;
default:
rb_bug("calculate_iseq_label: unreachable");
}
}
// Return true if a given location is a C method or supposed to behave like one.
static inline bool
location_cfunc_p(rb_backtrace_location_t *loc)
{
if (!loc->cme) return false;
switch (loc->cme->def->type) {
case VM_METHOD_TYPE_CFUNC:
return true;
case VM_METHOD_TYPE_ISEQ:
return rb_iseq_attr_p(loc->cme->def->body.iseq.iseqptr, BUILTIN_ATTR_C_TRACE);
default:
return false;
}
}
static VALUE
location_label(rb_backtrace_location_t *loc)
{
if (location_cfunc_p(loc)) {
return rb_gen_method_name(loc->cme->owner, rb_id2str(loc->cme->def->original_id));
}
else {
VALUE owner = Qnil;
if (loc->cme) {
owner = loc->cme->owner;
}
return calculate_iseq_label(owner, loc->iseq);
}
}
/*
* 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:
*
* foo
* block in foo
* 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)
{
if (location_cfunc_p(loc)) {
return rb_id2str(loc->cme->def->original_id);
}
return ISEQ_BODY(loc->iseq)->location.base_label;
}
/*
* Returns the base label of this frame, which is usually equal to the label,
* without decoration.
*
* Consider the following example:
*
* def foo
* puts caller_locations(0).first.base_label
*
* 1.times do
* puts caller_locations(0).first.base_label
*
* 1.times do
* puts caller_locations(0).first.base_label
* end
* end
* end
*
* The result of calling +foo+ is this:
*
* foo
* foo
* foo
*/
static VALUE
location_base_label_m(VALUE self)
{
return location_base_label(location_ptr(self));
}
static const rb_iseq_t *
location_iseq(rb_backtrace_location_t *loc)
{
return loc->iseq;
}
/*
* Returns the file name of this frame. This will generally be an absolute
* path, unless the frame is in the main script, in which case it will be the
* script location passed on the command line.
*
* 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)
{
const rb_iseq_t *iseq = location_iseq(location_ptr(self));
return iseq ? rb_iseq_path(iseq) : Qnil;
}
#ifdef USE_ISEQ_NODE_ID
static int
location_node_id(rb_backtrace_location_t *loc)
{
if (loc->iseq && loc->pc) {
return calc_node_id(loc->iseq, loc->pc);
}
return -1;
}
#endif
int
rb_get_node_id_from_frame_info(VALUE obj)
{
#ifdef USE_ISEQ_NODE_ID
rb_backtrace_location_t *loc = location_ptr(obj);
return location_node_id(loc);
#else
return -1;
#endif
}
const rb_iseq_t *
rb_get_iseq_from_frame_info(VALUE obj)
{
rb_backtrace_location_t *loc = location_ptr(obj);
const rb_iseq_t *iseq = location_iseq(loc);
return iseq;
}
static VALUE
location_realpath(rb_backtrace_location_t *loc)
{
if (loc->iseq) {
return rb_iseq_realpath(loc->iseq);
}
return Qnil;
}
/*
* Returns the full file path of this frame.
*
* Same as #path, except that it will return absolute path
* even if the frame is in the main script.
*/
static VALUE
location_absolute_path_m(VALUE self)
{
return location_realpath(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, owner = Qnil, name;
int lineno;
if (location_cfunc_p(loc)) {
if (loc->iseq && loc->pc) {
file = rb_iseq_path(loc->iseq);
lineno = calc_lineno(loc->iseq, loc->pc);
}
else {
file = GET_VM()->progname;
lineno = 0;
}
name = rb_gen_method_name(loc->cme->owner, rb_id2str(loc->cme->def->original_id));
}
else {
file = rb_iseq_path(loc->iseq);
lineno = calc_lineno(loc->iseq, loc->pc);
if (loc->cme) {
owner = loc->cme->owner;
}
name = calculate_iseq_label(owner, loc->iseq);
}
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 {
int backtrace_size;
VALUE strary;
VALUE locary;
rb_backtrace_location_t backtrace[1];
} 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_movable(bt->strary);
rb_gc_mark_movable(bt->locary);
}
static void
location_update_entry(rb_backtrace_location_t *fi)
{
fi->cme = (rb_callable_method_entry_t *)rb_gc_location((VALUE)fi->cme);
if (fi->iseq) {
fi->iseq = (rb_iseq_t *)rb_gc_location((VALUE)fi->iseq);
}
}
static void
backtrace_update(void *ptr)
{
rb_backtrace_t *bt = (rb_backtrace_t *)ptr;
size_t i, s = bt->backtrace_size;
for (i=0; i<s; i++) {
location_update_entry(&bt->backtrace[i]);
}
bt->strary = rb_gc_location(bt->strary);
bt->locary = rb_gc_location(bt->locary);
}
static const rb_data_type_t backtrace_data_type = {
"backtrace",
{
backtrace_mark,
RUBY_DEFAULT_FREE,
NULL, // No external memory to report,
backtrace_update,
},
/* Cannot set the RUBY_TYPED_EMBEDDABLE flag because the loc of frame_info
* points elements in the backtrace array. This can cause the loc to become
* incorrect if this backtrace object is moved by compaction. */
0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED
};
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 VALUE
backtrace_alloc_capa(long num_frames, rb_backtrace_t **backtrace)
{
size_t memsize = offsetof(rb_backtrace_t, backtrace) + num_frames * sizeof(rb_backtrace_location_t);
VALUE btobj = rb_data_typed_object_zalloc(rb_cBacktrace, memsize, &backtrace_data_type);
TypedData_Get_Struct(btobj, rb_backtrace_t, &backtrace_data_type, *backtrace);
return btobj;
}
static long
backtrace_size(const rb_execution_context_t *ec)
{
const rb_control_frame_t *last_cfp = ec->cfp;
const rb_control_frame_t *start_cfp = RUBY_VM_END_CONTROL_FRAME(ec);
if (start_cfp == NULL) {
return -1;
}
start_cfp =
RUBY_VM_NEXT_CONTROL_FRAME(
RUBY_VM_NEXT_CONTROL_FRAME(start_cfp)); /* skip top frames */
if (start_cfp < last_cfp) {
return 0;
}
return start_cfp - last_cfp + 1;
}
static bool
is_internal_location(const rb_control_frame_t *cfp)
{
static const char prefix[] = "<internal:";
const size_t prefix_len = sizeof(prefix) - 1;
VALUE file = rb_iseq_path(cfp->iseq);
return strncmp(prefix, RSTRING_PTR(file), prefix_len) == 0;
}
static bool
is_rescue_or_ensure_frame(const rb_control_frame_t *cfp)
{
enum rb_iseq_type type = ISEQ_BODY(cfp->iseq)->type;
return type == ISEQ_TYPE_RESCUE || type == ISEQ_TYPE_ENSURE;
}
static void
bt_update_cfunc_loc(unsigned long cfunc_counter, rb_backtrace_location_t *cfunc_loc, const rb_iseq_t *iseq, const VALUE *pc)
{
for (; cfunc_counter > 0; cfunc_counter--, cfunc_loc--) {
cfunc_loc->iseq = iseq;
cfunc_loc->pc = pc;
}
}
static VALUE location_create(rb_backtrace_location_t *srcloc, void *btobj);
static void
bt_yield_loc(rb_backtrace_location_t *loc, long num_frames, VALUE btobj)
{
for (; num_frames > 0; num_frames--, loc++) {
rb_yield(location_create(loc, (void *)btobj));
}
}
static VALUE
rb_ec_partial_backtrace_object(const rb_execution_context_t *ec, long start_frame, long num_frames, int* start_too_large, bool skip_internal, bool do_yield)
{
const rb_control_frame_t *cfp = ec->cfp;
const rb_control_frame_t *end_cfp = RUBY_VM_END_CONTROL_FRAME(ec);
ptrdiff_t size;
rb_backtrace_t *bt = NULL;
VALUE btobj = Qnil;
rb_backtrace_location_t *loc = NULL;
unsigned long cfunc_counter = 0;
bool skip_next_frame = FALSE;
// In the case the thread vm_stack or cfp is not initialized, there is no backtrace.
if (end_cfp == NULL) {
num_frames = 0;
}
else {
end_cfp = RUBY_VM_NEXT_CONTROL_FRAME(end_cfp);
/*
* top frame (dummy) <- RUBY_VM_END_CONTROL_FRAME
* top frame (dummy) <- end_cfp
* top frame <- main script
* top frame
* ...
* 2nd frame <- lev:0
* current frame <- ec->cfp
*/
size = end_cfp - cfp + 1;
if (size < 0) {
num_frames = 0;
}
else if (num_frames < 0 || num_frames > size) {
num_frames = size;
}
}
btobj = backtrace_alloc_capa(num_frames, &bt);
bt->backtrace_size = 0;
if (num_frames == 0) {
if (start_too_large) *start_too_large = 0;
return btobj;
}
for (; cfp != end_cfp && (bt->backtrace_size < num_frames); cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp)) {
if (cfp->iseq) {
if (cfp->pc) {
if (start_frame > 0) {
start_frame--;
}
else if (!(skip_internal && is_internal_location(cfp))) {
if (!skip_next_frame) {
const rb_iseq_t *iseq = cfp->iseq;
const VALUE *pc = cfp->pc;
loc = &bt->backtrace[bt->backtrace_size++];
RB_OBJ_WRITE(btobj, &loc->cme, rb_vm_frame_method_entry(cfp));
// Ruby methods with `Primitive.attr! :c_trace` should behave like C methods
if (rb_iseq_attr_p(cfp->iseq, BUILTIN_ATTR_C_TRACE)) {
loc->iseq = NULL;
loc->pc = NULL;
cfunc_counter++;
}
else {
RB_OBJ_WRITE(btobj, &loc->iseq, iseq);
loc->pc = pc;
bt_update_cfunc_loc(cfunc_counter, loc-1, iseq, pc);
if (do_yield) {
bt_yield_loc(loc - cfunc_counter, cfunc_counter+1, btobj);
}
cfunc_counter = 0;
}
}
skip_next_frame = is_rescue_or_ensure_frame(cfp);
}
}
}
else {
VM_ASSERT(RUBYVM_CFUNC_FRAME_P(cfp));
if (start_frame > 0) {
start_frame--;
}
else {
loc = &bt->backtrace[bt->backtrace_size++];
RB_OBJ_WRITE(btobj, &loc->cme, rb_vm_frame_method_entry(cfp));
loc->iseq = NULL;
loc->pc = NULL;
cfunc_counter++;
}
}
}
// When a backtrace entry corresponds to a method defined in C (e.g. rb_define_method), the reported file:line
// is the one of the caller Ruby frame, so if the last entry is a C frame we find the caller Ruby frame here.
if (cfunc_counter > 0) {
for (; cfp != end_cfp; cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp)) {
if (cfp->iseq && cfp->pc && !(skip_internal && is_internal_location(cfp))) {
VM_ASSERT(!skip_next_frame); // ISEQ_TYPE_RESCUE/ISEQ_TYPE_ENSURE should have a caller Ruby ISEQ, not a cfunc
bt_update_cfunc_loc(cfunc_counter, loc, cfp->iseq, cfp->pc);
RB_OBJ_WRITTEN(btobj, Qundef, cfp->iseq);
if (do_yield) {
bt_yield_loc(loc - cfunc_counter, cfunc_counter, btobj);
}
break;
}
}
}
if (start_too_large) *start_too_large = (start_frame > 0 ? -1 : 0);
return btobj;
}
VALUE
rb_ec_backtrace_object(const rb_execution_context_t *ec)
{
return rb_ec_partial_backtrace_object(ec, BACKTRACE_START, ALL_BACKTRACE_LINES, NULL, FALSE, FALSE);
}
static VALUE
backtrace_collect(rb_backtrace_t *bt, VALUE (*func)(rb_backtrace_location_t *, void *arg), void *arg)
{
VALUE btary;
int i;
btary = rb_ary_new2(bt->backtrace_size);
for (i=0; i<bt->backtrace_size; i++) {
rb_backtrace_location_t *loc = &bt->backtrace[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)
{
VALUE r;
rb_backtrace_t *bt;
TypedData_Get_Struct(self, rb_backtrace_t, &backtrace_data_type, bt);
r = backtrace_collect(bt, location_to_str_dmyarg, 0);
RB_GC_GUARD(self);
return r;
}
VALUE
rb_backtrace_to_str_ary(VALUE self)
{
rb_backtrace_t *bt;
TypedData_Get_Struct(self, rb_backtrace_t, &backtrace_data_type, bt);
if (!bt->strary) {
RB_OBJ_WRITE(self, &bt->strary, backtrace_to_str_ary(self));
}
return bt->strary;
}
void
rb_backtrace_use_iseq_first_lineno_for_last_location(VALUE self)
{
rb_backtrace_t *bt;
rb_backtrace_location_t *loc;
TypedData_Get_Struct(self, rb_backtrace_t, &backtrace_data_type, bt);
VM_ASSERT(bt->backtrace_size > 0);
loc = &bt->backtrace[0];
VM_ASSERT(!loc->cme || loc->cme->def->type == VM_METHOD_TYPE_ISEQ);
loc->pc = NULL; // means location.first_lineno
}
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;
RB_OBJ_WRITE(obj, &vloc->btobj, (VALUE)btobj);
return obj;
}
static VALUE
backtrace_to_location_ary(VALUE self)
{
VALUE r;
rb_backtrace_t *bt;
TypedData_Get_Struct(self, rb_backtrace_t, &backtrace_data_type, bt);
r = backtrace_collect(bt, location_create, (void *)self);
RB_GC_GUARD(self);
return r;
}
VALUE
rb_backtrace_to_location_ary(VALUE self)
{
rb_backtrace_t *bt;
TypedData_Get_Struct(self, rb_backtrace_t, &backtrace_data_type, bt);
if (!bt->locary) {
RB_OBJ_WRITE(self, &bt->locary, backtrace_to_location_ary(self));
}
return bt->locary;
}
VALUE
rb_location_ary_to_backtrace(VALUE ary)
{
if (!RB_TYPE_P(ary, T_ARRAY) || !rb_frame_info_p(RARRAY_AREF(ary, 0))) {
return Qfalse;
}
rb_backtrace_t *new_backtrace;
long num_frames = RARRAY_LEN(ary);
VALUE btobj = backtrace_alloc_capa(num_frames, &new_backtrace);
for (long index = 0; index < RARRAY_LEN(ary); index++) {
VALUE locobj = RARRAY_AREF(ary, index);
if (!rb_frame_info_p(locobj)) {
return Qfalse;
}
struct valued_frame_info *src_vloc;
TypedData_Get_Struct(locobj, struct valued_frame_info, &location_data_type, src_vloc);
rb_backtrace_location_t *dst_location = &new_backtrace->backtrace[index];
RB_OBJ_WRITE(btobj, &dst_location->cme, src_vloc->loc->cme);
RB_OBJ_WRITE(btobj, &dst_location->iseq, src_vloc->loc->iseq);
dst_location->pc = src_vloc->loc->pc;
new_backtrace->backtrace_size++;
RB_GC_GUARD(locobj);
}
return btobj;
}
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;
TypedData_Get_Struct(self, rb_backtrace_t, &backtrace_data_type, bt);
RB_OBJ_WRITE(self, &bt->strary, str);
return self;
}
/*
* call-seq: Thread::Backtrace::limit -> integer
*
* Returns maximum backtrace length set by <tt>--backtrace-limit</tt>
* command-line option. The default is <tt>-1</tt> which means unlimited
* backtraces. If the value is zero or positive, the error backtraces,
* produced by Exception#full_message, are abbreviated and the extra lines
* are replaced by <tt>... 3 levels... </tt>
*
* $ ruby -r net/http -e "p Thread::Backtrace.limit; Net::HTTP.get(URI('http://wrong.address'))"
* - 1
* .../lib/ruby/3.1.0/socket.rb:227:in `getaddrinfo': Failed to open TCP connection to wrong.address:80 (getaddrinfo: Name or service not known) (SocketError)
* from .../lib/ruby/3.1.0/socket.rb:227:in `foreach'
* from .../lib/ruby/3.1.0/socket.rb:632:in `tcp'
* from .../lib/ruby/3.1.0/net/http.rb:998:in `connect'
* from .../lib/ruby/3.1.0/net/http.rb:976:in `do_start'
* from .../lib/ruby/3.1.0/net/http.rb:965:in `start'
* from .../lib/ruby/3.1.0/net/http.rb:627:in `start'
* from .../lib/ruby/3.1.0/net/http.rb:503:in `get_response'
* from .../lib/ruby/3.1.0/net/http.rb:474:in `get'
* .../lib/ruby/3.1.0/socket.rb:227:in `getaddrinfo': getaddrinfo: Name or service not known (SocketError)
* from .../lib/ruby/3.1.0/socket.rb:227:in `foreach'
* from .../lib/ruby/3.1.0/socket.rb:632:in `tcp'
* from .../lib/ruby/3.1.0/net/http.rb:998:in `connect'
* from .../lib/ruby/3.1.0/net/http.rb:976:in `do_start'
* from .../lib/ruby/3.1.0/net/http.rb:965:in `start'
* from .../lib/ruby/3.1.0/net/http.rb:627:in `start'
* from .../lib/ruby/3.1.0/net/http.rb:503:in `get_response'
* from .../lib/ruby/3.1.0/net/http.rb:474:in `get'
* from -e:1:in `<main>'
*
* $ ruby --backtrace-limit 2 -r net/http -e "p Thread::Backtrace.limit; Net::HTTP.get(URI('http://wrong.address'))"
* 2
* .../lib/ruby/3.1.0/socket.rb:227:in `getaddrinfo': Failed to open TCP connection to wrong.address:80 (getaddrinfo: Name or service not known) (SocketError)
* from .../lib/ruby/3.1.0/socket.rb:227:in `foreach'
* from .../lib/ruby/3.1.0/socket.rb:632:in `tcp'
* ... 7 levels...
* .../lib/ruby/3.1.0/socket.rb:227:in `getaddrinfo': getaddrinfo: Name or service not known (SocketError)
* from .../lib/ruby/3.1.0/socket.rb:227:in `foreach'
* from .../lib/ruby/3.1.0/socket.rb:632:in `tcp'
* ... 7 levels...
*
* $ ruby --backtrace-limit 0 -r net/http -e "p Thread::Backtrace.limit; Net::HTTP.get(URI('http://wrong.address'))"
* 0
* .../lib/ruby/3.1.0/socket.rb:227:in `getaddrinfo': Failed to open TCP connection to wrong.address:80 (getaddrinfo: Name or service not known) (SocketError)
* ... 9 levels...
* .../lib/ruby/3.1.0/socket.rb:227:in `getaddrinfo': getaddrinfo: Name or service not known (SocketError)
* ... 9 levels...
*
*/
static VALUE
backtrace_limit(VALUE self)
{
return LONG2NUM(rb_backtrace_length_limit);
}
VALUE
rb_ec_backtrace_str_ary(const rb_execution_context_t *ec, long lev, long n)
{
return rb_backtrace_to_str_ary(rb_ec_partial_backtrace_object(ec, lev, n, NULL, FALSE, FALSE));
}
VALUE
rb_ec_backtrace_location_ary(const rb_execution_context_t *ec, long lev, long n, bool skip_internal)
{
return rb_backtrace_to_location_ary(rb_ec_partial_backtrace_object(ec, lev, n, NULL, skip_internal, FALSE));
}
/* make old style backtrace directly */
static void
backtrace_each(const rb_execution_context_t *ec,
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)
{
const rb_control_frame_t *last_cfp = ec->cfp;
const rb_control_frame_t *start_cfp = RUBY_VM_END_CONTROL_FRAME(ec);
const rb_control_frame_t *cfp;
ptrdiff_t size, i;
// In the case the thread vm_stack or cfp is not initialized, there is no backtrace.
if (start_cfp == NULL) {
init(arg, 0);
return;
}
/* <- start_cfp (end control frame)
* top frame (dummy)
* top frame (dummy)
* top frame <- start_cfp
* top frame
* ...
* 2nd frame <- lev:0
* current frame <- ec->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 *)(ec->vm_stack + ec->vm_stack_size) - cfp); */
if (cfp->iseq) {
if (cfp->pc) {
iter_iseq(arg, cfp);
}
}
else {
VM_ASSERT(RUBYVM_CFUNC_FRAME_P(cfp));
const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(cfp);
ID mid = me->def->original_id;
iter_cfunc(arg, cfp, mid);
}
}
}
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;
arg->filename = GET_VM()->progname;
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 = rb_iseq_path(iseq);
VALUE name = ISEQ_BODY(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_EC(),
oldbt_init,
oldbt_iter_iseq,
oldbt_iter_cfunc,
&arg);
}
struct oldbt_bugreport_arg {
FILE *fp;
int count;
};
static void
oldbt_bugreport(void *arg, VALUE file, int line, VALUE method)
{
struct oldbt_bugreport_arg *p = arg;
FILE *fp = p->fp;
const char *filename = NIL_P(file) ? "ruby" : RSTRING_PTR(file);
if (!p->count) {
fprintf(fp, "-- Ruby level backtrace information "
"----------------------------------------\n");
p->count = 1;
}
if (NIL_P(method)) {
fprintf(fp, "%s:%d:in unknown method\n", filename, line);
}
else {
fprintf(fp, "%s:%d:in '%s'\n", filename, line, RSTRING_PTR(method));
}
}
void
rb_backtrace_print_as_bugreport(FILE *fp)
{
struct oldbt_arg arg;
struct oldbt_bugreport_arg barg = {fp, 0};
arg.func = oldbt_bugreport;
arg.data = &barg;
backtrace_each(GET_EC(),
oldbt_init,
oldbt_iter_iseq,
oldbt_iter_cfunc,
&arg);
}
void
rb_backtrace(void)
{
vm_backtrace_print(stderr);
}
struct print_to_arg {
VALUE (*iter)(VALUE recv, VALUE str);
VALUE output;
};
static void
oldbt_print_to(void *data, VALUE file, int lineno, VALUE name)
{
const struct print_to_arg *arg = 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);
}
(*arg->iter)(arg->output, str);
}
void
rb_backtrace_each(VALUE (*iter)(VALUE recv, VALUE str), VALUE output)
{
struct oldbt_arg arg;
struct print_to_arg parg;
parg.iter = iter;
parg.output = output;
arg.func = oldbt_print_to;
arg.data = &parg;
backtrace_each(GET_EC(),
oldbt_init,
oldbt_iter_iseq,
oldbt_iter_cfunc,
&arg);
}
VALUE
rb_make_backtrace(void)
{
return rb_ec_backtrace_str_ary(GET_EC(), BACKTRACE_START, ALL_BACKTRACE_LINES);
}
static long
ec_backtrace_range(const rb_execution_context_t *ec, int argc, const VALUE *argv, int lev_default, int lev_plus, long *len_ptr)
{
VALUE level, vn, opts;
long lev, n;
rb_scan_args(argc, argv, "02:", &level, &vn, &opts);
if (!NIL_P(opts)) {
rb_get_kwargs(opts, (ID []){0}, 0, 0, NULL);
}
if (argc == 2 && NIL_P(vn)) argc--;
switch (argc) {
case 0:
lev = lev_default + lev_plus;
n = ALL_BACKTRACE_LINES;
break;
case 1:
{
long beg, len, bt_size = backtrace_size(ec);
switch (rb_range_beg_len(level, &beg, &len, bt_size - lev_plus, 0)) {
case Qfalse:
lev = NUM2LONG(level);
if (lev < 0) {
rb_raise(rb_eArgError, "negative level (%ld)", lev);
}
lev += lev_plus;
n = ALL_BACKTRACE_LINES;
break;
case Qnil:
return -1;
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;
}
*len_ptr = n;
return lev;
}
static VALUE
ec_backtrace_to_ary(const rb_execution_context_t *ec, int argc, const VALUE *argv, int lev_default, int lev_plus, int to_str)
{
long lev, n;
VALUE btval, r;
int too_large;
lev = ec_backtrace_range(ec, argc, argv, lev_default, lev_plus, &n);
if (lev < 0) return Qnil;
if (n == 0) {
return rb_ary_new();
}
btval = rb_ec_partial_backtrace_object(ec, lev, n, &too_large, FALSE, FALSE);
if (too_large) {
return Qnil;
}
if (to_str) {
r = backtrace_to_str_ary(btval);
}
else {
r = backtrace_to_location_ary(btval);
}
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 *target_th = rb_thread_ptr(thval);
if (target_th->to_kill || target_th->status == THREAD_KILLED)
return Qnil;
return ec_backtrace_to_ary(target_th->ec, 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);
}
VALUE
rb_vm_backtrace(int argc, const VALUE * argv, struct rb_execution_context_struct * ec)
{
return ec_backtrace_to_ary(ec, argc, argv, 0, 0, 1);
}
VALUE
rb_vm_backtrace_locations(int argc, const VALUE * argv, struct rb_execution_context_struct * ec)
{
return ec_backtrace_to_ary(ec, argc, argv, 0, 0, 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, VALUE _)
{
return ec_backtrace_to_ary(GET_EC(), 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, VALUE _)
{
return ec_backtrace_to_ary(GET_EC(), argc, argv, 1, 1, 0);
}
/*
* call-seq:
* Thread.each_caller_location(...) { |loc| ... } -> nil
*
* Yields each frame of the current execution stack as a
* backtrace location object.
*/
static VALUE
each_caller_location(int argc, VALUE *argv, VALUE _)
{
rb_execution_context_t *ec = GET_EC();
long n, lev = ec_backtrace_range(ec, argc, argv, 1, 1, &n);
if (lev >= 0 && n != 0) {
rb_ec_partial_backtrace_object(ec, lev, n, NULL, FALSE, TRUE);
}
return Qnil;
}
/* called from Init_vm() in vm.c */
void
Init_vm_backtrace(void)
{
/*
* An internal representation of the backtrace. The user will never interact with
* objects of this class directly, but class methods can be used to get backtrace
* settings of the current session.
*/
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);
rb_define_singleton_method(rb_cBacktrace, "limit", backtrace_limit, 0);
/*
* An object representation of a stack frame, initialized by
* Kernel#caller_locations.
*
* For example:
*
* # caller_locations.rb
* def a(skip)
* caller_locations(skip)
* end
* def b(skip)
* a(skip)
* end
* def c(skip)
* b(skip)
* end
*
* c(0..2).map do |call|
* puts call.to_s
* end
*
* Running <code>ruby caller_locations.rb</code> will produce:
*
* caller_locations.rb:2:in `a'
* caller_locations.rb:5:in `b'
* caller_locations.rb:8:in `c'
*
* Here's another example with a slightly different result:
*
* # foo.rb
* class Foo
* attr_accessor :locations
* def initialize(skip)
* @locations = caller_locations(skip)
* end
* end
*
* Foo.new(0..2).locations.map do |call|
* puts call.to_s
* end
*
* Now run <code>ruby foo.rb</code> and you should see:
*
* init.rb:4:in `initialize'
* init.rb:8:in `new'
* init.rb:8:in `<main>'
*/
rb_cBacktraceLocation = rb_define_class_under(rb_cBacktrace, "Location", rb_cObject);
rb_undef_alloc_func(rb_cBacktraceLocation);
rb_undef_method(CLASS_OF(rb_cBacktraceLocation), "new");
rb_define_method(rb_cBacktraceLocation, "lineno", location_lineno_m, 0);
rb_define_method(rb_cBacktraceLocation, "label", location_label_m, 0);
rb_define_method(rb_cBacktraceLocation, "base_label", location_base_label_m, 0);
rb_define_method(rb_cBacktraceLocation, "path", location_path_m, 0);
rb_define_method(rb_cBacktraceLocation, "absolute_path", location_absolute_path_m, 0);
rb_define_method(rb_cBacktraceLocation, "to_s", location_to_str_m, 0);
rb_define_method(rb_cBacktraceLocation, "inspect", location_inspect_m, 0);
rb_define_global_function("caller", rb_f_caller, -1);
rb_define_global_function("caller_locations", rb_f_caller_locations, -1);
rb_define_singleton_method(rb_cThread, "each_caller_location", each_caller_location, -1);
}
/* debugger API */
RUBY_SYMBOL_EXPORT_BEGIN
RUBY_SYMBOL_EXPORT_END
struct rb_debug_inspector_struct {
rb_execution_context_t *ec;
rb_control_frame_t *cfp;
VALUE backtrace;
VALUE contexts; /* [[klass, binding, iseq, cfp], ...] */
long backtrace_size;
};
enum {
CALLER_BINDING_SELF,
CALLER_BINDING_CLASS,
CALLER_BINDING_BINDING,
CALLER_BINDING_ISEQ,
CALLER_BINDING_CFP,
CALLER_BINDING_DEPTH,
};
struct collect_caller_bindings_data {
VALUE ary;
const rb_execution_context_t *ec;
};
static void
collect_caller_bindings_init(void *arg, size_t size)
{
/* */
}
static VALUE
get_klass(const rb_control_frame_t *cfp)
{
VALUE klass;
if (rb_vm_control_frame_id_and_class(cfp, 0, 0, &klass)) {
if (RB_TYPE_P(klass, T_ICLASS)) {
return RBASIC(klass)->klass;
}
else {
return klass;
}
}
else {
return Qnil;
}
}
static int
frame_depth(const rb_execution_context_t *ec, const rb_control_frame_t *cfp)
{
VM_ASSERT(RUBY_VM_END_CONTROL_FRAME(ec) >= cfp);
return (int)(RUBY_VM_END_CONTROL_FRAME(ec) - cfp);
}
static void
collect_caller_bindings_iseq(void *arg, const rb_control_frame_t *cfp)
{
struct collect_caller_bindings_data *data = (struct collect_caller_bindings_data *)arg;
VALUE frame = rb_ary_new2(6);
rb_ary_store(frame, CALLER_BINDING_SELF, cfp->self);
rb_ary_store(frame, CALLER_BINDING_CLASS, get_klass(cfp));
rb_ary_store(frame, CALLER_BINDING_BINDING, GC_GUARDED_PTR(cfp)); /* create later */
rb_ary_store(frame, CALLER_BINDING_ISEQ, cfp->iseq ? (VALUE)cfp->iseq : Qnil);
rb_ary_store(frame, CALLER_BINDING_CFP, GC_GUARDED_PTR(cfp));
rb_ary_store(frame, CALLER_BINDING_DEPTH, INT2FIX(frame_depth(data->ec, cfp)));
rb_ary_push(data->ary, frame);
}
static void
collect_caller_bindings_cfunc(void *arg, const rb_control_frame_t *cfp, ID mid)
{
struct collect_caller_bindings_data *data = (struct collect_caller_bindings_data *)arg;
VALUE frame = rb_ary_new2(6);
rb_ary_store(frame, CALLER_BINDING_SELF, cfp->self);
rb_ary_store(frame, CALLER_BINDING_CLASS, get_klass(cfp));
rb_ary_store(frame, CALLER_BINDING_BINDING, Qnil); /* not available */
rb_ary_store(frame, CALLER_BINDING_ISEQ, Qnil); /* not available */
rb_ary_store(frame, CALLER_BINDING_CFP, GC_GUARDED_PTR(cfp));
rb_ary_store(frame, CALLER_BINDING_DEPTH, INT2FIX(frame_depth(data->ec, cfp)));
rb_ary_push(data->ary, frame);
}
static VALUE
collect_caller_bindings(const rb_execution_context_t *ec)
{
int i;
VALUE result;
struct collect_caller_bindings_data data = {
rb_ary_new(), ec
};
backtrace_each(ec,
collect_caller_bindings_init,
collect_caller_bindings_iseq,
collect_caller_bindings_cfunc,
&data);
result = rb_ary_reverse(data.ary);
/* bindings should be created from top of frame */
for (i=0; i<RARRAY_LEN(result); i++) {
VALUE entry = rb_ary_entry(result, i);
VALUE cfp_val = rb_ary_entry(entry, CALLER_BINDING_BINDING);
if (!NIL_P(cfp_val)) {
rb_control_frame_t *cfp = GC_GUARDED_PTR_REF(cfp_val);
rb_ary_store(entry, CALLER_BINDING_BINDING, rb_vm_make_binding(ec, cfp));
}
}
return result;
}
/*
* Note that the passed `rb_debug_inspector_t' will be disabled
* after `rb_debug_inspector_open'.
*/
VALUE
rb_debug_inspector_open(rb_debug_inspector_func_t func, void *data)
{
rb_debug_inspector_t dbg_context;
rb_execution_context_t *ec = GET_EC();
enum ruby_tag_type state;
volatile VALUE MAYBE_UNUSED(result);
/* escape all env to heap */
rb_vm_stack_to_heap(ec);
dbg_context.ec = ec;
dbg_context.cfp = dbg_context.ec->cfp;
dbg_context.backtrace = rb_ec_backtrace_location_ary(ec, BACKTRACE_START, ALL_BACKTRACE_LINES, FALSE);
dbg_context.backtrace_size = RARRAY_LEN(dbg_context.backtrace);
dbg_context.contexts = collect_caller_bindings(ec);
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
result = (*func)(&dbg_context, data);
}
EC_POP_TAG();
/* invalidate bindings? */
if (state) {
EC_JUMP_TAG(ec, state);
}
return result;
}
static VALUE
frame_get(const rb_debug_inspector_t *dc, long index)
{
if (index < 0 || index >= dc->backtrace_size) {
rb_raise(rb_eArgError, "no such frame");
}
return rb_ary_entry(dc->contexts, index);
}
VALUE
rb_debug_inspector_frame_self_get(const rb_debug_inspector_t *dc, long index)
{
VALUE frame = frame_get(dc, index);
return rb_ary_entry(frame, CALLER_BINDING_SELF);
}
VALUE
rb_debug_inspector_frame_class_get(const rb_debug_inspector_t *dc, long index)
{
VALUE frame = frame_get(dc, index);
return rb_ary_entry(frame, CALLER_BINDING_CLASS);
}
VALUE
rb_debug_inspector_frame_binding_get(const rb_debug_inspector_t *dc, long index)
{
VALUE frame = frame_get(dc, index);
return rb_ary_entry(frame, CALLER_BINDING_BINDING);
}
VALUE
rb_debug_inspector_frame_iseq_get(const rb_debug_inspector_t *dc, long index)
{
VALUE frame = frame_get(dc, index);
VALUE iseq = rb_ary_entry(frame, CALLER_BINDING_ISEQ);
return RTEST(iseq) ? rb_iseqw_new((rb_iseq_t *)iseq) : Qnil;
}
VALUE
rb_debug_inspector_frame_depth(const rb_debug_inspector_t *dc, long index)
{
VALUE frame = frame_get(dc, index);
return rb_ary_entry(frame, CALLER_BINDING_DEPTH);
}
VALUE
rb_debug_inspector_current_depth(void)
{
rb_execution_context_t *ec = GET_EC();
return INT2FIX(frame_depth(ec, ec->cfp));
}
VALUE
rb_debug_inspector_backtrace_locations(const rb_debug_inspector_t *dc)
{
return dc->backtrace;
}
static int
thread_profile_frames(rb_execution_context_t *ec, int start, int limit, VALUE *buff, int *lines)
{
int i;
const rb_control_frame_t *cfp = ec->cfp, *end_cfp = RUBY_VM_END_CONTROL_FRAME(ec);
const rb_control_frame_t *top = cfp;
const rb_callable_method_entry_t *cme;
// If this function is called inside a thread after thread creation, but
// before the CFP has been created, just return 0. This can happen when
// sampling via signals. Threads can be interrupted randomly by the
// signal, including during the time after the thread has been created, but
// before the CFP has been allocated
if (!cfp) {
return 0;
}
// Skip dummy frame; see `rb_ec_partial_backtrace_object` for details
end_cfp = RUBY_VM_NEXT_CONTROL_FRAME(end_cfp);
for (i=0; i<limit && cfp != end_cfp; cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp)) {
if (VM_FRAME_RUBYFRAME_P(cfp) && cfp->pc != 0) {
if (start > 0) {
start--;
continue;
}
/* record frame info */
cme = rb_vm_frame_method_entry(cfp);
if (cme && cme->def->type == VM_METHOD_TYPE_ISEQ) {
buff[i] = (VALUE)cme;
}
else {
buff[i] = (VALUE)cfp->iseq;
}
if (lines) {
// The topmost frame may not have an updated PC because the JIT
// may not have set one. The JIT compiler will update the PC
// before entering a new function (so that `caller` will work),
// so only the topmost frame could possibly have an out of date PC
if (cfp == top && cfp->jit_return) {
lines[i] = 0;
}
else {
lines[i] = calc_lineno(cfp->iseq, cfp->pc);
}
}
i++;
}
else {
cme = rb_vm_frame_method_entry(cfp);
if (cme && cme->def->type == VM_METHOD_TYPE_CFUNC) {
if (start > 0) {
start--;
continue;
}
buff[i] = (VALUE)cme;
if (lines) lines[i] = 0;
i++;
}
}
}
return i;
}
int
rb_profile_frames(int start, int limit, VALUE *buff, int *lines)
{
rb_execution_context_t *ec = rb_current_execution_context(false);
// If there is no EC, we may be attempting to profile a non-Ruby thread or a
// M:N shared native thread which has no active Ruby thread.
if (!ec) {
return 0;
}
return thread_profile_frames(ec, start, limit, buff, lines);
}
int
rb_profile_thread_frames(VALUE thread, int start, int limit, VALUE *buff, int *lines)
{
rb_thread_t *th = rb_thread_ptr(thread);
return thread_profile_frames(th->ec, start, limit, buff, lines);
}
static const rb_iseq_t *
frame2iseq(VALUE frame)
{
if (NIL_P(frame)) return NULL;
if (RB_TYPE_P(frame, T_IMEMO)) {
switch (imemo_type(frame)) {
case imemo_iseq:
return (const rb_iseq_t *)frame;
case imemo_ment:
{
const rb_callable_method_entry_t *cme = (rb_callable_method_entry_t *)frame;
switch (cme->def->type) {
case VM_METHOD_TYPE_ISEQ:
return cme->def->body.iseq.iseqptr;
default:
return NULL;
}
}
default:
break;
}
}
rb_bug("frame2iseq: unreachable");
}
VALUE
rb_profile_frame_path(VALUE frame)
{
const rb_iseq_t *iseq = frame2iseq(frame);
return iseq ? rb_iseq_path(iseq) : Qnil;
}
static const rb_callable_method_entry_t *
cframe(VALUE frame)
{
if (NIL_P(frame)) return NULL;
if (RB_TYPE_P(frame, T_IMEMO)) {
switch (imemo_type(frame)) {
case imemo_ment:
{
const rb_callable_method_entry_t *cme = (rb_callable_method_entry_t *)frame;
switch (cme->def->type) {
case VM_METHOD_TYPE_CFUNC:
return cme;
default:
return NULL;
}
}
default:
return NULL;
}
}
return NULL;
}
VALUE
rb_profile_frame_absolute_path(VALUE frame)
{
if (cframe(frame)) {
static VALUE cfunc_str = Qfalse;
if (!cfunc_str) {
cfunc_str = rb_str_new_literal("<cfunc>");
rb_vm_register_global_object(cfunc_str);
}
return cfunc_str;
}
const rb_iseq_t *iseq = frame2iseq(frame);
return iseq ? rb_iseq_realpath(iseq) : Qnil;
}
VALUE
rb_profile_frame_label(VALUE frame)
{
const rb_iseq_t *iseq = frame2iseq(frame);
return iseq ? rb_iseq_label(iseq) : Qnil;
}
VALUE
rb_profile_frame_base_label(VALUE frame)
{
const rb_iseq_t *iseq = frame2iseq(frame);
return iseq ? rb_iseq_base_label(iseq) : Qnil;
}
VALUE
rb_profile_frame_first_lineno(VALUE frame)
{
const rb_iseq_t *iseq = frame2iseq(frame);
return iseq ? rb_iseq_first_lineno(iseq) : Qnil;
}
static VALUE
frame2klass(VALUE frame)
{
if (NIL_P(frame)) return Qnil;
if (RB_TYPE_P(frame, T_IMEMO)) {
const rb_callable_method_entry_t *cme = (rb_callable_method_entry_t *)frame;
if (imemo_type(frame) == imemo_ment) {
return cme->defined_class;
}
}
return Qnil;
}
VALUE
rb_profile_frame_classpath(VALUE frame)
{
VALUE klass = frame2klass(frame);
if (klass && !NIL_P(klass)) {
if (RB_TYPE_P(klass, T_ICLASS)) {
klass = RBASIC(klass)->klass;
}
else if (RCLASS_SINGLETON_P(klass)) {
klass = RCLASS_ATTACHED_OBJECT(klass);
if (!RB_TYPE_P(klass, T_CLASS) && !RB_TYPE_P(klass, T_MODULE))
return rb_sprintf("#<%s:%p>", rb_class2name(rb_obj_class(klass)), (void*)klass);
}
return rb_class_path(klass);
}
else {
return Qnil;
}
}
VALUE
rb_profile_frame_singleton_method_p(VALUE frame)
{
VALUE klass = frame2klass(frame);
return RBOOL(klass && !NIL_P(klass) && RCLASS_SINGLETON_P(klass));
}
VALUE
rb_profile_frame_method_name(VALUE frame)
{
const rb_callable_method_entry_t *cme = cframe(frame);
if (cme) {
ID mid = cme->def->original_id;
return id2str(mid);
}
const rb_iseq_t *iseq = frame2iseq(frame);
return iseq ? rb_iseq_method_name(iseq) : Qnil;
}
static VALUE
qualified_method_name(VALUE frame, VALUE method_name)
{
if (method_name != Qnil) {
VALUE classpath = rb_profile_frame_classpath(frame);
VALUE singleton_p = rb_profile_frame_singleton_method_p(frame);
if (classpath != Qnil) {
return rb_sprintf("%"PRIsVALUE"%s%"PRIsVALUE,
classpath, singleton_p == Qtrue ? "." : "#", method_name);
}
else {
return method_name;
}
}
else {
return Qnil;
}
}
VALUE
rb_profile_frame_qualified_method_name(VALUE frame)
{
VALUE method_name = rb_profile_frame_method_name(frame);
return qualified_method_name(frame, method_name);
}
VALUE
rb_profile_frame_full_label(VALUE frame)
{
const rb_callable_method_entry_t *cme = cframe(frame);
if (cme) {
ID mid = cme->def->original_id;
VALUE method_name = id2str(mid);
return qualified_method_name(frame, method_name);
}
VALUE label = rb_profile_frame_label(frame);
VALUE base_label = rb_profile_frame_base_label(frame);
VALUE qualified_method_name = rb_profile_frame_qualified_method_name(frame);
if (NIL_P(qualified_method_name) || base_label == qualified_method_name) {
return label;
}
else {
long label_length = RSTRING_LEN(label);
long base_label_length = RSTRING_LEN(base_label);
int prefix_len = rb_long2int(label_length - base_label_length);
return rb_sprintf("%.*s%"PRIsVALUE, prefix_len, RSTRING_PTR(label), qualified_method_name);
}
}
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