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ruby/vm_trace.c

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C
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/**********************************************************************
vm_trace.c -
$Author: ko1 $
created at: Tue Aug 14 19:37:09 2012
Copyright (C) 1993-2012 Yukihiro Matsumoto
**********************************************************************/
/*
* This file include two parts:
*
* (1) set_trace_func internal mechanisms
* and C level API
*
* (2) Ruby level API
* (2-1) set_trace_func API
* (2-2) TracePoint API (not yet)
*
*/
#include "internal.h"
#include "ruby/debug.h"
#include "vm_core.h"
#include "iseq.h"
#include "eval_intern.h"
/* (1) trace mechanisms */
typedef struct rb_event_hook_struct {
rb_event_hook_flag_t hook_flags;
rb_event_flag_t events;
rb_event_hook_func_t func;
VALUE data;
struct rb_event_hook_struct *next;
struct {
rb_thread_t *th;
} filter;
} rb_event_hook_t;
typedef void (*rb_event_hook_raw_arg_func_t)(VALUE data, const rb_trace_arg_t *arg);
#define MAX_EVENT_NUM 32
/* called from vm.c */
void
rb_vm_trace_mark_event_hooks(rb_hook_list_t *hooks)
{
rb_event_hook_t *hook = hooks->hooks;
while (hook) {
rb_gc_mark(hook->data);
hook = hook->next;
}
}
/* ruby_vm_event_flags management */
static void
update_global_event_hook(rb_event_flag_t vm_events)
{
rb_event_flag_t new_iseq_events = vm_events & ISEQ_TRACE_EVENTS;
rb_event_flag_t cur_iseq_events = ruby_vm_event_flags & ISEQ_TRACE_EVENTS;
if (new_iseq_events > cur_iseq_events) {
/* write all ISeqs iff new events are added */
rb_iseq_trace_set_all(new_iseq_events);
}
ruby_vm_event_flags = vm_events;
rb_objspace_set_event_hook(vm_events);
}
/* add/remove hooks */
static rb_event_hook_t *
alloc_event_hook(rb_event_hook_func_t func, rb_event_flag_t events, VALUE data, rb_event_hook_flag_t hook_flags)
{
rb_event_hook_t *hook;
if ((events & RUBY_INTERNAL_EVENT_MASK) && (events & ~RUBY_INTERNAL_EVENT_MASK)) {
rb_raise(rb_eTypeError, "Can not specify normal event and internal event simultaneously.");
}
hook = ALLOC(rb_event_hook_t);
hook->hook_flags = hook_flags;
hook->events = events;
hook->func = func;
hook->data = data;
/* no filters */
hook->filter.th = 0;
return hook;
}
static void
connect_event_hook(const rb_execution_context_t *ec, rb_event_hook_t *hook)
{
rb_hook_list_t *list = &rb_ec_vm_ptr(ec)->event_hooks;
hook->next = list->hooks;
list->hooks = hook;
list->events |= hook->events;
update_global_event_hook(list->events);
}
static void
rb_threadptr_add_event_hook(const rb_execution_context_t *ec, rb_thread_t *th,
rb_event_hook_func_t func, rb_event_flag_t events, VALUE data, rb_event_hook_flag_t hook_flags)
{
rb_event_hook_t *hook = alloc_event_hook(func, events, data, hook_flags);
hook->filter.th = th;
connect_event_hook(ec, hook);
}
void
rb_thread_add_event_hook(VALUE thval, rb_event_hook_func_t func, rb_event_flag_t events, VALUE data)
{
rb_threadptr_add_event_hook(GET_EC(), rb_thread_ptr(thval), func, events, data, RUBY_EVENT_HOOK_FLAG_SAFE);
}
void
rb_add_event_hook(rb_event_hook_func_t func, rb_event_flag_t events, VALUE data)
{
rb_event_hook_t *hook = alloc_event_hook(func, events, data, RUBY_EVENT_HOOK_FLAG_SAFE);
connect_event_hook(GET_EC(), hook);
}
void
rb_thread_add_event_hook2(VALUE thval, rb_event_hook_func_t func, rb_event_flag_t events, VALUE data, rb_event_hook_flag_t hook_flags)
{
rb_threadptr_add_event_hook(GET_EC(), rb_thread_ptr(thval), func, events, data, hook_flags);
}
void
rb_add_event_hook2(rb_event_hook_func_t func, rb_event_flag_t events, VALUE data, rb_event_hook_flag_t hook_flags)
{
rb_event_hook_t *hook = alloc_event_hook(func, events, data, hook_flags);
connect_event_hook(GET_EC(), hook);
}
static void
clean_hooks(rb_hook_list_t *list)
{
rb_event_hook_t *hook, **nextp = &list->hooks;
VM_ASSERT(list->need_clean == TRUE);
list->events = 0;
list->need_clean = FALSE;
while ((hook = *nextp) != 0) {
if (hook->hook_flags & RUBY_EVENT_HOOK_FLAG_DELETED) {
*nextp = hook->next;
xfree(hook);
}
else {
list->events |= hook->events; /* update active events */
nextp = &hook->next;
}
}
update_global_event_hook(list->events);
}
static void
clean_hooks_check(rb_vm_t *vm, rb_hook_list_t *list)
{
if (UNLIKELY(list->need_clean != FALSE)) {
if (vm->trace_running == 0) {
clean_hooks(list);
}
}
}
#define MATCH_ANY_FILTER_TH ((rb_thread_t *)1)
/* if func is 0, then clear all funcs */
static int
remove_event_hook(const rb_execution_context_t *ec, const rb_thread_t *filter_th, rb_event_hook_func_t func, VALUE data)
{
rb_vm_t *vm = rb_ec_vm_ptr(ec);
rb_hook_list_t *list = &vm->event_hooks;
int ret = 0;
rb_event_hook_t *hook = list->hooks;
while (hook) {
if (func == 0 || hook->func == func) {
if (hook->filter.th == filter_th || filter_th == MATCH_ANY_FILTER_TH) {
if (data == Qundef || hook->data == data) {
hook->hook_flags |= RUBY_EVENT_HOOK_FLAG_DELETED;
ret+=1;
list->need_clean = TRUE;
}
}
}
hook = hook->next;
}
clean_hooks_check(vm, list);
return ret;
}
static int
rb_threadptr_remove_event_hook(const rb_execution_context_t *ec, const rb_thread_t *filter_th, rb_event_hook_func_t func, VALUE data)
{
return remove_event_hook(ec, filter_th, func, data);
}
int
rb_thread_remove_event_hook(VALUE thval, rb_event_hook_func_t func)
{
return rb_threadptr_remove_event_hook(GET_EC(), rb_thread_ptr(thval), func, Qundef);
}
int
rb_thread_remove_event_hook_with_data(VALUE thval, rb_event_hook_func_t func, VALUE data)
{
return rb_threadptr_remove_event_hook(GET_EC(), rb_thread_ptr(thval), func, data);
}
int
rb_remove_event_hook(rb_event_hook_func_t func)
{
return remove_event_hook(GET_EC(), NULL, func, Qundef);
}
int
rb_remove_event_hook_with_data(rb_event_hook_func_t func, VALUE data)
{
return remove_event_hook(GET_EC(), NULL, func, data);
}
void
rb_clear_trace_func(void)
{
rb_execution_context_t *ec = GET_EC();
rb_threadptr_remove_event_hook(ec, MATCH_ANY_FILTER_TH, 0, Qundef);
}
void
rb_ec_clear_current_thread_trace_func(const rb_execution_context_t *ec)
{
rb_threadptr_remove_event_hook(ec, rb_ec_thread_ptr(ec), 0, Qundef);
}
/* invoke hooks */
static void
exec_hooks_body(const rb_execution_context_t *ec, rb_hook_list_t *list, const rb_trace_arg_t *trace_arg)
{
rb_event_hook_t *hook;
for (hook = list->hooks; hook; hook = hook->next) {
if (!(hook->hook_flags & RUBY_EVENT_HOOK_FLAG_DELETED) &&
(trace_arg->event & hook->events) &&
(hook->filter.th == 0 || hook->filter.th == rb_ec_thread_ptr(ec))) {
if (!(hook->hook_flags & RUBY_EVENT_HOOK_FLAG_RAW_ARG)) {
(*hook->func)(trace_arg->event, hook->data, trace_arg->self, trace_arg->id, trace_arg->klass);
}
else {
(*((rb_event_hook_raw_arg_func_t)hook->func))(hook->data, trace_arg);
}
}
}
}
static int
exec_hooks_precheck(const rb_execution_context_t *ec, rb_vm_t *vm, rb_hook_list_t *list, const rb_trace_arg_t *trace_arg)
{
if (list->events & trace_arg->event) {
vm->trace_running++;
return TRUE;
}
else {
return FALSE;
}
}
static void
exec_hooks_postcheck(const rb_execution_context_t *ec, rb_vm_t *vm, rb_hook_list_t *list)
{
vm->trace_running--;
clean_hooks_check(vm, list);
}
static void
exec_hooks_unprotected(const rb_execution_context_t *ec, rb_vm_t *vm, rb_hook_list_t *list, const rb_trace_arg_t *trace_arg)
{
if (exec_hooks_precheck(ec, vm, list, trace_arg) == 0) return;
exec_hooks_body(ec, list, trace_arg);
exec_hooks_postcheck(ec, vm, list);
}
static int
exec_hooks_protected(rb_execution_context_t *ec, rb_vm_t *vm, rb_hook_list_t *list, const rb_trace_arg_t *trace_arg)
{
enum ruby_tag_type state;
volatile int raised;
if (exec_hooks_precheck(ec, vm, list, trace_arg) == 0) return 0;
raised = rb_ec_reset_raised(ec);
/* TODO: Support !RUBY_EVENT_HOOK_FLAG_SAFE hooks */
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
exec_hooks_body(ec, list, trace_arg);
}
EC_POP_TAG();
exec_hooks_postcheck(ec, vm, list);
if (raised) {
rb_ec_set_raised(ec);
}
return state;
}
void
rb_exec_event_hooks(rb_trace_arg_t *trace_arg, int pop_p)
{
rb_execution_context_t *ec = trace_arg->ec;
rb_vm_t *vm = rb_ec_vm_ptr(ec);
if (trace_arg->event & RUBY_INTERNAL_EVENT_MASK) {
if (ec->trace_arg && (ec->trace_arg->event & RUBY_INTERNAL_EVENT_MASK)) {
/* skip hooks because this thread doing INTERNAL_EVENT */
}
else {
rb_trace_arg_t *prev_trace_arg = ec->trace_arg;
ec->trace_arg = trace_arg;
exec_hooks_unprotected(ec, vm, &vm->event_hooks, trace_arg);
ec->trace_arg = prev_trace_arg;
}
}
else {
if (ec->trace_arg == NULL && /* check reentrant */
trace_arg->self != rb_mRubyVMFrozenCore /* skip special methods. TODO: remove it. */) {
const VALUE errinfo = ec->errinfo;
const VALUE old_recursive = ec->local_storage_recursive_hash;
int state = 0;
ec->local_storage_recursive_hash = ec->local_storage_recursive_hash_for_trace;
ec->errinfo = Qnil;
ec->trace_arg = trace_arg;
state = exec_hooks_protected(ec, vm, &vm->event_hooks, trace_arg);
if (!state) {
ec->errinfo = errinfo;
}
ec->trace_arg = NULL;
ec->local_storage_recursive_hash_for_trace = ec->local_storage_recursive_hash;
ec->local_storage_recursive_hash = old_recursive;
if (state) {
if (pop_p) {
if (VM_FRAME_FINISHED_P(ec->cfp)) {
ec->tag = ec->tag->prev;
}
rb_vm_pop_frame(ec);
}
EC_JUMP_TAG(ec, state);
}
}
}
}
VALUE
rb_suppress_tracing(VALUE (*func)(VALUE), VALUE arg)
{
volatile int raised;
VALUE result = Qnil;
rb_execution_context_t *ec = GET_EC();
rb_vm_t *vm = rb_ec_vm_ptr(ec);
enum ruby_tag_type state;
const int volatile tracing = ec->trace_arg ? 1 : 0;
rb_trace_arg_t dummy_trace_arg;
dummy_trace_arg.event = 0;
if (!tracing) {
vm->trace_running++;
}
if (!ec->trace_arg) ec->trace_arg = &dummy_trace_arg;
raised = rb_ec_reset_raised(ec);
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
result = (*func)(arg);
}
EC_POP_TAG();
if (raised) {
rb_ec_reset_raised(ec);
}
if (ec->trace_arg == &dummy_trace_arg) ec->trace_arg = NULL;
if (!tracing) {
vm->trace_running--;
}
if (state) {
#if defined RUBY_USE_SETJMPEX && RUBY_USE_SETJMPEX
RB_GC_GUARD(result);
#endif
EC_JUMP_TAG(ec, state);
}
return result;
}
static void call_trace_func(rb_event_flag_t, VALUE data, VALUE self, ID id, VALUE klass);
/* (2-1) set_trace_func (old API) */
/*
* call-seq:
* set_trace_func(proc) -> proc
* set_trace_func(nil) -> nil
*
* Establishes _proc_ as the handler for tracing, or disables
* tracing if the parameter is +nil+.
*
* *Note:* this method is obsolete, please use TracePoint instead.
*
* _proc_ takes up to six parameters:
*
* * an event name
* * a filename
* * a line number
* * an object id
* * a binding
* * the name of a class
*
* _proc_ is invoked whenever an event occurs.
*
* Events are:
*
* +c-call+:: call a C-language routine
* +c-return+:: return from a C-language routine
* +call+:: call a Ruby method
* +class+:: start a class or module definition
* +end+:: finish a class or module definition
* +line+:: execute code on a new line
* +raise+:: raise an exception
* +return+:: return from a Ruby method
*
* Tracing is disabled within the context of _proc_.
*
* class Test
* def test
* a = 1
* b = 2
* end
* end
*
* set_trace_func proc { |event, file, line, id, binding, classname|
* printf "%8s %s:%-2d %10s %8s\n", event, file, line, id, classname
* }
* t = Test.new
* t.test
*
* line prog.rb:11 false
* c-call prog.rb:11 new Class
* c-call prog.rb:11 initialize Object
* c-return prog.rb:11 initialize Object
* c-return prog.rb:11 new Class
* line prog.rb:12 false
* call prog.rb:2 test Test
* line prog.rb:3 test Test
* line prog.rb:4 test Test
* return prog.rb:4 test Test
*/
static VALUE
set_trace_func(VALUE obj, VALUE trace)
{
rb_remove_event_hook(call_trace_func);
if (NIL_P(trace)) {
return Qnil;
}
if (!rb_obj_is_proc(trace)) {
rb_raise(rb_eTypeError, "trace_func needs to be Proc");
}
rb_add_event_hook(call_trace_func, RUBY_EVENT_ALL, trace);
return trace;
}
static void
thread_add_trace_func(rb_execution_context_t *ec, rb_thread_t *filter_th, VALUE trace)
{
if (!rb_obj_is_proc(trace)) {
rb_raise(rb_eTypeError, "trace_func needs to be Proc");
}
rb_threadptr_add_event_hook(ec, filter_th, call_trace_func, RUBY_EVENT_ALL, trace, RUBY_EVENT_HOOK_FLAG_SAFE);
}
/*
* call-seq:
* thr.add_trace_func(proc) -> proc
*
* Adds _proc_ as a handler for tracing.
*
* See Thread#set_trace_func and Kernel#set_trace_func.
*/
static VALUE
thread_add_trace_func_m(VALUE obj, VALUE trace)
{
thread_add_trace_func(GET_EC(), rb_thread_ptr(obj), trace);
return trace;
}
/*
* call-seq:
* thr.set_trace_func(proc) -> proc
* thr.set_trace_func(nil) -> nil
*
* Establishes _proc_ on _thr_ as the handler for tracing, or
* disables tracing if the parameter is +nil+.
*
* See Kernel#set_trace_func.
*/
static VALUE
thread_set_trace_func_m(VALUE target_thread, VALUE trace)
{
rb_execution_context_t *ec = GET_EC();
rb_thread_t *target_th = rb_thread_ptr(target_thread);
rb_threadptr_remove_event_hook(ec, target_th, call_trace_func, Qundef);
if (NIL_P(trace)) {
return Qnil;
}
else {
thread_add_trace_func(ec, target_th, trace);
return trace;
}
}
static const char *
get_event_name(rb_event_flag_t event)
{
switch (event) {
case RUBY_EVENT_LINE: return "line";
case RUBY_EVENT_CLASS: return "class";
case RUBY_EVENT_END: return "end";
case RUBY_EVENT_CALL: return "call";
case RUBY_EVENT_RETURN: return "return";
case RUBY_EVENT_C_CALL: return "c-call";
case RUBY_EVENT_C_RETURN: return "c-return";
case RUBY_EVENT_RAISE: return "raise";
default:
return "unknown";
}
}
static ID
get_event_id(rb_event_flag_t event)
{
ID id;
switch (event) {
#define C(name, NAME) case RUBY_EVENT_##NAME: CONST_ID(id, #name); return id;
C(line, LINE);
C(class, CLASS);
C(end, END);
C(call, CALL);
C(return, RETURN);
C(c_call, C_CALL);
C(c_return, C_RETURN);
C(raise, RAISE);
C(b_call, B_CALL);
C(b_return, B_RETURN);
C(thread_begin, THREAD_BEGIN);
C(thread_end, THREAD_END);
C(fiber_switch, FIBER_SWITCH);
C(specified_line, SPECIFIED_LINE);
case RUBY_EVENT_LINE | RUBY_EVENT_SPECIFIED_LINE: CONST_ID(id, "line"); return id;
#undef C
default:
return 0;
}
}
static void
get_path_and_lineno(const rb_execution_context_t *ec, const rb_control_frame_t *cfp, rb_event_flag_t event, VALUE *pathp, int *linep)
{
cfp = rb_vm_get_ruby_level_next_cfp(ec, cfp);
if (cfp) {
const rb_iseq_t *iseq = cfp->iseq;
*pathp = rb_iseq_path(iseq);
if (event & (RUBY_EVENT_CLASS |
RUBY_EVENT_CALL |
RUBY_EVENT_B_CALL)) {
*linep = FIX2INT(rb_iseq_first_lineno(iseq));
}
else {
*linep = rb_vm_get_sourceline(cfp);
}
}
else {
*pathp = Qnil;
*linep = 0;
}
}
static void
call_trace_func(rb_event_flag_t event, VALUE proc, VALUE self, ID id, VALUE klass)
{
int line;
VALUE filename;
VALUE eventname = rb_str_new2(get_event_name(event));
VALUE argv[6];
const rb_execution_context_t *ec = GET_EC();
get_path_and_lineno(ec, ec->cfp, event, &filename, &line);
if (!klass) {
rb_ec_frame_method_id_and_class(ec, &id, 0, &klass);
}
if (klass) {
if (RB_TYPE_P(klass, T_ICLASS)) {
klass = RBASIC(klass)->klass;
}
else if (FL_TEST(klass, FL_SINGLETON)) {
klass = rb_ivar_get(klass, id__attached__);
}
}
argv[0] = eventname;
argv[1] = filename;
argv[2] = INT2FIX(line);
argv[3] = id ? ID2SYM(id) : Qnil;
argv[4] = (self && (filename != Qnil)) ? rb_binding_new() : Qnil;
argv[5] = klass ? klass : Qnil;
rb_proc_call_with_block(proc, 6, argv, Qnil);
}
/* (2-2) TracePoint API */
static VALUE rb_cTracePoint;
typedef struct rb_tp_struct {
rb_event_flag_t events;
int tracing; /* bool */
rb_thread_t *target_th;
void (*func)(VALUE tpval, void *data);
void *data;
VALUE proc;
VALUE self;
} rb_tp_t;
static void
tp_mark(void *ptr)
{
rb_tp_t *tp = ptr;
rb_gc_mark(tp->proc);
if (tp->target_th) rb_gc_mark(tp->target_th->self);
}
static size_t
tp_memsize(const void *ptr)
{
return sizeof(rb_tp_t);
}
static const rb_data_type_t tp_data_type = {
"tracepoint",
{tp_mark, RUBY_TYPED_NEVER_FREE, tp_memsize,},
0, 0, RUBY_TYPED_FREE_IMMEDIATELY
};
static VALUE
tp_alloc(VALUE klass)
{
rb_tp_t *tp;
return TypedData_Make_Struct(klass, rb_tp_t, &tp_data_type, tp);
}
static rb_event_flag_t
symbol2event_flag(VALUE v)
{
ID id;
VALUE sym = rb_to_symbol_type(v);
const rb_event_flag_t RUBY_EVENT_A_CALL =
RUBY_EVENT_CALL | RUBY_EVENT_B_CALL | RUBY_EVENT_C_CALL;
const rb_event_flag_t RUBY_EVENT_A_RETURN =
RUBY_EVENT_RETURN | RUBY_EVENT_B_RETURN | RUBY_EVENT_C_RETURN;
#define C(name, NAME) CONST_ID(id, #name); if (sym == ID2SYM(id)) return RUBY_EVENT_##NAME
C(line, LINE);
C(class, CLASS);
C(end, END);
C(call, CALL);
C(return, RETURN);
C(c_call, C_CALL);
C(c_return, C_RETURN);
C(raise, RAISE);
C(b_call, B_CALL);
C(b_return, B_RETURN);
C(thread_begin, THREAD_BEGIN);
C(thread_end, THREAD_END);
C(fiber_switch, FIBER_SWITCH);
C(specified_line, SPECIFIED_LINE);
C(a_call, A_CALL);
C(a_return, A_RETURN);
#undef C
rb_raise(rb_eArgError, "unknown event: %"PRIsVALUE, rb_sym2str(sym));
}
static rb_tp_t *
tpptr(VALUE tpval)
{
rb_tp_t *tp;
TypedData_Get_Struct(tpval, rb_tp_t, &tp_data_type, tp);
return tp;
}
static rb_trace_arg_t *
get_trace_arg(void)
{
rb_trace_arg_t *trace_arg = GET_EC()->trace_arg;
if (trace_arg == 0) {
rb_raise(rb_eRuntimeError, "access from outside");
}
return trace_arg;
}
struct rb_trace_arg_struct *
rb_tracearg_from_tracepoint(VALUE tpval)
{
return get_trace_arg();
}
rb_event_flag_t
rb_tracearg_event_flag(rb_trace_arg_t *trace_arg)
{
return trace_arg->event;
}
VALUE
rb_tracearg_event(rb_trace_arg_t *trace_arg)
{
return ID2SYM(get_event_id(trace_arg->event));
}
static void
fill_path_and_lineno(rb_trace_arg_t *trace_arg)
{
if (trace_arg->path == Qundef) {
get_path_and_lineno(trace_arg->ec, trace_arg->cfp, trace_arg->event, &trace_arg->path, &trace_arg->lineno);
}
}
VALUE
rb_tracearg_lineno(rb_trace_arg_t *trace_arg)
{
fill_path_and_lineno(trace_arg);
return INT2FIX(trace_arg->lineno);
}
VALUE
rb_tracearg_path(rb_trace_arg_t *trace_arg)
{
fill_path_and_lineno(trace_arg);
return trace_arg->path;
}
static void
fill_id_and_klass(rb_trace_arg_t *trace_arg)
{
if (!trace_arg->klass_solved) {
if (!trace_arg->klass) {
rb_vm_control_frame_id_and_class(trace_arg->cfp, &trace_arg->id, &trace_arg->called_id, &trace_arg->klass);
}
if (trace_arg->klass) {
if (RB_TYPE_P(trace_arg->klass, T_ICLASS)) {
trace_arg->klass = RBASIC(trace_arg->klass)->klass;
}
}
else {
trace_arg->klass = Qnil;
}
trace_arg->klass_solved = 1;
}
}
VALUE
rb_tracearg_method_id(rb_trace_arg_t *trace_arg)
{
fill_id_and_klass(trace_arg);
return trace_arg->id ? ID2SYM(trace_arg->id) : Qnil;
}
VALUE
rb_tracearg_callee_id(rb_trace_arg_t *trace_arg)
{
fill_id_and_klass(trace_arg);
return trace_arg->called_id ? ID2SYM(trace_arg->called_id) : Qnil;
}
VALUE
rb_tracearg_defined_class(rb_trace_arg_t *trace_arg)
{
fill_id_and_klass(trace_arg);
return trace_arg->klass;
}
VALUE
rb_tracearg_binding(rb_trace_arg_t *trace_arg)
{
rb_control_frame_t *cfp;
cfp = rb_vm_get_binding_creatable_next_cfp(trace_arg->ec, trace_arg->cfp);
if (cfp) {
return rb_vm_make_binding(trace_arg->ec, cfp);
}
else {
return Qnil;
}
}
VALUE
rb_tracearg_self(rb_trace_arg_t *trace_arg)
{
return trace_arg->self;
}
VALUE
rb_tracearg_return_value(rb_trace_arg_t *trace_arg)
{
if (trace_arg->event & (RUBY_EVENT_RETURN | RUBY_EVENT_C_RETURN | RUBY_EVENT_B_RETURN)) {
/* ok */
}
else {
rb_raise(rb_eRuntimeError, "not supported by this event");
}
if (trace_arg->data == Qundef) {
rb_bug("tp_attr_return_value_m: unreachable");
}
return trace_arg->data;
}
VALUE
rb_tracearg_raised_exception(rb_trace_arg_t *trace_arg)
{
if (trace_arg->event & (RUBY_EVENT_RAISE)) {
/* ok */
}
else {
rb_raise(rb_eRuntimeError, "not supported by this event");
}
if (trace_arg->data == Qundef) {
rb_bug("tp_attr_raised_exception_m: unreachable");
}
return trace_arg->data;
}
VALUE
rb_tracearg_object(rb_trace_arg_t *trace_arg)
{
if (trace_arg->event & (RUBY_INTERNAL_EVENT_NEWOBJ | RUBY_INTERNAL_EVENT_FREEOBJ)) {
/* ok */
}
else {
rb_raise(rb_eRuntimeError, "not supported by this event");
}
if (trace_arg->data == Qundef) {
rb_bug("tp_attr_raised_exception_m: unreachable");
}
return trace_arg->data;
}
/*
* Type of event
*
* See TracePoint@Events for more information.
*/
static VALUE
tracepoint_attr_event(VALUE tpval)
{
return rb_tracearg_event(get_trace_arg());
}
/*
* Line number of the event
*/
static VALUE
tracepoint_attr_lineno(VALUE tpval)
{
return rb_tracearg_lineno(get_trace_arg());
}
/*
* Path of the file being run
*/
static VALUE
tracepoint_attr_path(VALUE tpval)
{
return rb_tracearg_path(get_trace_arg());
}
/*
* Return the name at the definition of the method being called
*/
static VALUE
tracepoint_attr_method_id(VALUE tpval)
{
return rb_tracearg_method_id(get_trace_arg());
}
/*
* Return the called name of the method being called
*/
static VALUE
tracepoint_attr_callee_id(VALUE tpval)
{
return rb_tracearg_callee_id(get_trace_arg());
}
/*
* Return class or module of the method being called.
*
* class C; def foo; end; end
* trace = TracePoint.new(:call) do |tp|
* p tp.defined_class #=> C
* end.enable do
* C.new.foo
* end
*
* If method is defined by a module, then that module is returned.
*
* module M; def foo; end; end
* class C; include M; end;
* trace = TracePoint.new(:call) do |tp|
* p tp.defined_class #=> M
* end.enable do
* C.new.foo
* end
*
* <b>Note:</b> #defined_class returns singleton class.
*
* 6th block parameter of Kernel#set_trace_func passes original class
* of attached by singleton class.
*
* <b>This is a difference between Kernel#set_trace_func and TracePoint.</b>
*
* class C; def self.foo; end; end
* trace = TracePoint.new(:call) do |tp|
* p tp.defined_class #=> #<Class:C>
* end.enable do
* C.foo
* end
*/
static VALUE
tracepoint_attr_defined_class(VALUE tpval)
{
return rb_tracearg_defined_class(get_trace_arg());
}
/*
* Return the generated binding object from event
*/
static VALUE
tracepoint_attr_binding(VALUE tpval)
{
return rb_tracearg_binding(get_trace_arg());
}
/*
* Return the trace object during event
*
* Same as TracePoint#binding:
* trace.binding.eval('self')
*/
static VALUE
tracepoint_attr_self(VALUE tpval)
{
return rb_tracearg_self(get_trace_arg());
}
/*
* Return value from +:return+, +c_return+, and +b_return+ event
*/
static VALUE
tracepoint_attr_return_value(VALUE tpval)
{
return rb_tracearg_return_value(get_trace_arg());
}
/*
* Value from exception raised on the +:raise+ event
*/
static VALUE
tracepoint_attr_raised_exception(VALUE tpval)
{
return rb_tracearg_raised_exception(get_trace_arg());
}
static void
tp_call_trace(VALUE tpval, rb_trace_arg_t *trace_arg)
{
rb_tp_t *tp = tpptr(tpval);
if (tp->func) {
(*tp->func)(tpval, tp->data);
}
else {
rb_proc_call_with_block((VALUE)tp->proc, 1, &tpval, Qnil);
}
}
VALUE
rb_tracepoint_enable(VALUE tpval)
{
rb_tp_t *tp;
tp = tpptr(tpval);
if (tp->target_th) {
rb_thread_add_event_hook2(tp->target_th->self, (rb_event_hook_func_t)tp_call_trace, tp->events, tpval,
RUBY_EVENT_HOOK_FLAG_SAFE | RUBY_EVENT_HOOK_FLAG_RAW_ARG);
}
else {
rb_add_event_hook2((rb_event_hook_func_t)tp_call_trace, tp->events, tpval,
RUBY_EVENT_HOOK_FLAG_SAFE | RUBY_EVENT_HOOK_FLAG_RAW_ARG);
}
tp->tracing = 1;
return Qundef;
}
VALUE
rb_tracepoint_disable(VALUE tpval)
{
rb_tp_t *tp;
tp = tpptr(tpval);
if (tp->target_th) {
rb_thread_remove_event_hook_with_data(tp->target_th->self, (rb_event_hook_func_t)tp_call_trace, tpval);
}
else {
rb_remove_event_hook_with_data((rb_event_hook_func_t)tp_call_trace, tpval);
}
tp->tracing = 0;
return Qundef;
}
/*
* call-seq:
* trace.enable -> true or false
* trace.enable { block } -> obj
*
* Activates the trace
*
* Return true if trace was enabled.
* Return false if trace was disabled.
*
* trace.enabled? #=> false
* trace.enable #=> false (previous state)
* # trace is enabled
* trace.enabled? #=> true
* trace.enable #=> true (previous state)
* # trace is still enabled
*
* If a block is given, the trace will only be enabled within the scope of the
* block.
*
* trace.enabled?
* #=> false
*
* trace.enable do
* trace.enabled?
* # only enabled for this block
* end
*
* trace.enabled?
* #=> false
*
* Note: You cannot access event hooks within the block.
*
* trace.enable { p tp.lineno }
* #=> RuntimeError: access from outside
*
*/
static VALUE
tracepoint_enable_m(VALUE tpval)
{
rb_tp_t *tp = tpptr(tpval);
int previous_tracing = tp->tracing;
rb_tracepoint_enable(tpval);
if (rb_block_given_p()) {
return rb_ensure(rb_yield, Qundef,
previous_tracing ? rb_tracepoint_enable : rb_tracepoint_disable,
tpval);
}
else {
return previous_tracing ? Qtrue : Qfalse;
}
}
/*
* call-seq:
* trace.disable -> true or false
* trace.disable { block } -> obj
*
* Deactivates the trace
*
* Return true if trace was enabled.
* Return false if trace was disabled.
*
* trace.enabled? #=> true
* trace.disable #=> true (previous status)
* trace.enabled? #=> false
* trace.disable #=> false
*
* If a block is given, the trace will only be disable within the scope of the
* block.
*
* trace.enabled?
* #=> true
*
* trace.disable do
* trace.enabled?
* # only disabled for this block
* end
*
* trace.enabled?
* #=> true
*
* Note: You cannot access event hooks within the block.
*
* trace.disable { p tp.lineno }
* #=> RuntimeError: access from outside
*/
static VALUE
tracepoint_disable_m(VALUE tpval)
{
rb_tp_t *tp = tpptr(tpval);
int previous_tracing = tp->tracing;
rb_tracepoint_disable(tpval);
if (rb_block_given_p()) {
return rb_ensure(rb_yield, Qundef,
previous_tracing ? rb_tracepoint_enable : rb_tracepoint_disable,
tpval);
}
else {
return previous_tracing ? Qtrue : Qfalse;
}
}
/*
* call-seq:
* trace.enabled? -> true or false
*
* The current status of the trace
*/
VALUE
rb_tracepoint_enabled_p(VALUE tpval)
{
rb_tp_t *tp = tpptr(tpval);
return tp->tracing ? Qtrue : Qfalse;
}
static VALUE
tracepoint_new(VALUE klass, rb_thread_t *target_th, rb_event_flag_t events, void (func)(VALUE, void*), void *data, VALUE proc)
{
VALUE tpval = tp_alloc(klass);
rb_tp_t *tp;
TypedData_Get_Struct(tpval, rb_tp_t, &tp_data_type, tp);
tp->proc = proc;
tp->func = func;
tp->data = data;
tp->events = events;
tp->self = tpval;
return tpval;
}
/*
* Creates a tracepoint by registering a callback function for one or more
* tracepoint events. Once the tracepoint is created, you can use
* rb_tracepoint_enable to enable the tracepoint.
*
* Parameters:
* 1. VALUE target_thval - Meant for picking the thread in which the tracepoint
* is to be created. However, current implementation ignore this parameter,
* tracepoint is created for all threads. Simply specify Qnil.
* 2. rb_event_flag_t events - Event(s) to listen to.
* 3. void (*func)(VALUE, void *) - A callback function.
* 4. void *data - Void pointer that will be passed to the callback function.
*
* When the callback function is called, it will be passed 2 parameters:
* 1)VALUE tpval - the TracePoint object from which trace args can be extracted.
* 2)void *data - A void pointer which helps to share scope with the callback function.
*
* It is important to note that you cannot register callbacks for normal events and internal events
* simultaneously because they are different purpose.
* You can use any Ruby APIs (calling methods and so on) on normal event hooks.
* However, in internal events, you can not use any Ruby APIs (even object creations).
* This is why we can't specify internal events by TracePoint directly.
* Limitations are MRI version specific.
*
* Example:
* rb_tracepoint_new(Qnil, RUBY_INTERNAL_EVENT_NEWOBJ | RUBY_INTERNAL_EVENT_FREEOBJ, obj_event_i, data);
*
* In this example, a callback function obj_event_i will be registered for
* internal events RUBY_INTERNAL_EVENT_NEWOBJ and RUBY_INTERNAL_EVENT_FREEOBJ.
*/
VALUE
rb_tracepoint_new(VALUE target_thval, rb_event_flag_t events, void (*func)(VALUE, void *), void *data)
{
rb_thread_t *target_th = NULL;
if (RTEST(target_thval)) {
target_th = rb_thread_ptr(target_thval);
/* TODO: Test it!
* Warning: This function is not tested.
*/
}
return tracepoint_new(rb_cTracePoint, target_th, events, func, data, Qundef);
}
/*
* call-seq:
* TracePoint.new(*events) { |obj| block } -> obj
*
* Returns a new TracePoint object, not enabled by default.
*
* Next, in order to activate the trace, you must use TracePoint#enable
*
* trace = TracePoint.new(:call) do |tp|
* p [tp.lineno, tp.defined_class, tp.method_id, tp.event]
* end
* #=> #<TracePoint:disabled>
*
* trace.enable
* #=> false
*
* puts "Hello, TracePoint!"
* # ...
* # [48, IRB::Notifier::AbstractNotifier, :printf, :call]
* # ...
*
* When you want to deactivate the trace, you must use TracePoint#disable
*
* trace.disable
*
* See TracePoint@Events for possible events and more information.
*
* A block must be given, otherwise an ArgumentError is raised.
*
* If the trace method isn't included in the given events filter, a
* RuntimeError is raised.
*
* TracePoint.trace(:line) do |tp|
* p tp.raised_exception
* end
* #=> RuntimeError: 'raised_exception' not supported by this event
*
* If the trace method is called outside block, a RuntimeError is raised.
*
* TracePoint.trace(:line) do |tp|
* $tp = tp
* end
* $tp.lineno #=> access from outside (RuntimeError)
*
* Access from other threads is also forbidden.
*
*/
static VALUE
tracepoint_new_s(int argc, VALUE *argv, VALUE self)
{
rb_event_flag_t events = 0;
int i;
if (argc > 0) {
for (i=0; i<argc; i++) {
events |= symbol2event_flag(argv[i]);
}
}
else {
events = RUBY_EVENT_TRACEPOINT_ALL;
}
if (!rb_block_given_p()) {
rb_raise(rb_eArgError, "must be called with a block");
}
return tracepoint_new(self, 0, events, 0, 0, rb_block_proc());
}
static VALUE
tracepoint_trace_s(int argc, VALUE *argv, VALUE self)
{
VALUE trace = tracepoint_new_s(argc, argv, self);
rb_tracepoint_enable(trace);
return trace;
}
/*
* call-seq:
* trace.inspect -> string
*
* Return a string containing a human-readable TracePoint
* status.
*/
static VALUE
tracepoint_inspect(VALUE self)
{
rb_tp_t *tp = tpptr(self);
rb_trace_arg_t *trace_arg = GET_EC()->trace_arg;
if (trace_arg) {
switch (trace_arg->event) {
case RUBY_EVENT_LINE:
case RUBY_EVENT_SPECIFIED_LINE:
{
VALUE sym = rb_tracearg_method_id(trace_arg);
if (NIL_P(sym))
goto default_inspect;
return rb_sprintf("#<TracePoint:%"PRIsVALUE"@%"PRIsVALUE":%d in `%"PRIsVALUE"'>",
rb_tracearg_event(trace_arg),
rb_tracearg_path(trace_arg),
FIX2INT(rb_tracearg_lineno(trace_arg)),
sym);
}
case RUBY_EVENT_CALL:
case RUBY_EVENT_C_CALL:
case RUBY_EVENT_RETURN:
case RUBY_EVENT_C_RETURN:
return rb_sprintf("#<TracePoint:%"PRIsVALUE" `%"PRIsVALUE"'@%"PRIsVALUE":%d>",
rb_tracearg_event(trace_arg),
rb_tracearg_method_id(trace_arg),
rb_tracearg_path(trace_arg),
FIX2INT(rb_tracearg_lineno(trace_arg)));
case RUBY_EVENT_THREAD_BEGIN:
case RUBY_EVENT_THREAD_END:
return rb_sprintf("#<TracePoint:%"PRIsVALUE" %"PRIsVALUE">",
rb_tracearg_event(trace_arg),
rb_tracearg_self(trace_arg));
default:
default_inspect:
return rb_sprintf("#<TracePoint:%"PRIsVALUE"@%"PRIsVALUE":%d>",
rb_tracearg_event(trace_arg),
rb_tracearg_path(trace_arg),
FIX2INT(rb_tracearg_lineno(trace_arg)));
}
}
else {
return rb_sprintf("#<TracePoint:%s>", tp->tracing ? "enabled" : "disabled");
}
}
static void
tracepoint_stat_event_hooks(VALUE hash, VALUE key, rb_event_hook_t *hook)
{
int active = 0, deleted = 0;
while (hook) {
if (hook->hook_flags & RUBY_EVENT_HOOK_FLAG_DELETED) {
deleted++;
}
else {
active++;
}
hook = hook->next;
}
rb_hash_aset(hash, key, rb_ary_new3(2, INT2FIX(active), INT2FIX(deleted)));
}
/*
* call-seq:
* TracePoint.stat -> obj
*
* Returns internal information of TracePoint.
*
* The contents of the returned value are implementation specific.
* It may be changed in future.
*
* This method is only for debugging TracePoint itself.
*/
static VALUE
tracepoint_stat_s(VALUE self)
{
rb_vm_t *vm = GET_VM();
VALUE stat = rb_hash_new();
tracepoint_stat_event_hooks(stat, vm->self, vm->event_hooks.hooks);
/* TODO: thread local hooks */
return stat;
}
static void Init_postponed_job(void);
/* This function is called from inits.c */
void
Init_vm_trace(void)
{
/* trace_func */
rb_define_global_function("set_trace_func", set_trace_func, 1);
rb_define_method(rb_cThread, "set_trace_func", thread_set_trace_func_m, 1);
rb_define_method(rb_cThread, "add_trace_func", thread_add_trace_func_m, 1);
/*
* Document-class: TracePoint
*
* A class that provides the functionality of Kernel#set_trace_func in a
* nice Object-Oriented API.
*
* == Example
*
* We can use TracePoint to gather information specifically for exceptions:
*
* trace = TracePoint.new(:raise) do |tp|
* p [tp.lineno, tp.event, tp.raised_exception]
* end
* #=> #<TracePoint:disabled>
*
* trace.enable
* #=> false
*
* 0 / 0
* #=> [5, :raise, #<ZeroDivisionError: divided by 0>]
*
* == Events
*
* If you don't specify the type of events you want to listen for,
* TracePoint will include all available events.
*
* *Note* do not depend on current event set, as this list is subject to
* change. Instead, it is recommended you specify the type of events you
* want to use.
*
* To filter what is traced, you can pass any of the following as +events+:
*
* +:line+:: execute code on a new line
* +:class+:: start a class or module definition
* +:end+:: finish a class or module definition
* +:call+:: call a Ruby method
* +:return+:: return from a Ruby method
* +:c_call+:: call a C-language routine
* +:c_return+:: return from a C-language routine
* +:raise+:: raise an exception
* +:b_call+:: event hook at block entry
* +:b_return+:: event hook at block ending
* +:thread_begin+:: event hook at thread beginning
* +:thread_end+:: event hook at thread ending
* +:fiber_switch+:: event hook at fiber switch
*
*/
rb_cTracePoint = rb_define_class("TracePoint", rb_cObject);
rb_undef_alloc_func(rb_cTracePoint);
rb_define_singleton_method(rb_cTracePoint, "new", tracepoint_new_s, -1);
/*
* Document-method: trace
*
* call-seq:
* TracePoint.trace(*events) { |obj| block } -> obj
*
* A convenience method for TracePoint.new, that activates the trace
* automatically.
*
* trace = TracePoint.trace(:call) { |tp| [tp.lineno, tp.event] }
* #=> #<TracePoint:enabled>
*
* trace.enabled? #=> true
*/
rb_define_singleton_method(rb_cTracePoint, "trace", tracepoint_trace_s, -1);
rb_define_method(rb_cTracePoint, "enable", tracepoint_enable_m, 0);
rb_define_method(rb_cTracePoint, "disable", tracepoint_disable_m, 0);
rb_define_method(rb_cTracePoint, "enabled?", rb_tracepoint_enabled_p, 0);
rb_define_method(rb_cTracePoint, "inspect", tracepoint_inspect, 0);
rb_define_method(rb_cTracePoint, "event", tracepoint_attr_event, 0);
rb_define_method(rb_cTracePoint, "lineno", tracepoint_attr_lineno, 0);
rb_define_method(rb_cTracePoint, "path", tracepoint_attr_path, 0);
rb_define_method(rb_cTracePoint, "method_id", tracepoint_attr_method_id, 0);
rb_define_method(rb_cTracePoint, "callee_id", tracepoint_attr_callee_id, 0);
rb_define_method(rb_cTracePoint, "defined_class", tracepoint_attr_defined_class, 0);
rb_define_method(rb_cTracePoint, "binding", tracepoint_attr_binding, 0);
rb_define_method(rb_cTracePoint, "self", tracepoint_attr_self, 0);
rb_define_method(rb_cTracePoint, "return_value", tracepoint_attr_return_value, 0);
rb_define_method(rb_cTracePoint, "raised_exception", tracepoint_attr_raised_exception, 0);
rb_define_singleton_method(rb_cTracePoint, "stat", tracepoint_stat_s, 0);
/* initialized for postponed job */
Init_postponed_job();
}
typedef struct rb_postponed_job_struct {
unsigned long flags; /* reserved */
rb_postponed_job_func_t func;
void *data;
} rb_postponed_job_t;
#define MAX_POSTPONED_JOB 1000
#define MAX_POSTPONED_JOB_SPECIAL_ADDITION 24
static void
Init_postponed_job(void)
{
rb_vm_t *vm = GET_VM();
vm->postponed_job_buffer = ALLOC_N(rb_postponed_job_t, MAX_POSTPONED_JOB);
vm->postponed_job_index = 0;
}
enum postponed_job_register_result {
PJRR_SUCESS = 0,
PJRR_FULL = 1,
PJRR_INTERRUPTED = 2
};
static enum postponed_job_register_result
postponed_job_register(rb_execution_context_t *ec, rb_vm_t *vm,
unsigned int flags, rb_postponed_job_func_t func, void *data, int max, int expected_index)
{
rb_postponed_job_t *pjob;
if (expected_index >= max) return PJRR_FULL; /* failed */
if (ATOMIC_CAS(vm->postponed_job_index, expected_index, expected_index+1) == expected_index) {
pjob = &vm->postponed_job_buffer[expected_index];
}
else {
return PJRR_INTERRUPTED;
}
pjob->flags = flags;
pjob->func = func;
pjob->data = data;
RUBY_VM_SET_POSTPONED_JOB_INTERRUPT(ec);
return PJRR_SUCESS;
}
/* return 0 if job buffer is full */
int
rb_postponed_job_register(unsigned int flags, rb_postponed_job_func_t func, void *data)
{
rb_execution_context_t *ec = GET_EC();
rb_vm_t *vm = rb_ec_vm_ptr(ec);
begin:
switch (postponed_job_register(ec, vm, flags, func, data, MAX_POSTPONED_JOB, vm->postponed_job_index)) {
case PJRR_SUCESS : return 1;
case PJRR_FULL : return 0;
case PJRR_INTERRUPTED: goto begin;
default: rb_bug("unreachable\n");
}
}
/* return 0 if job buffer is full */
int
rb_postponed_job_register_one(unsigned int flags, rb_postponed_job_func_t func, void *data)
{
rb_execution_context_t *ec = GET_EC();
rb_vm_t *vm = rb_ec_vm_ptr(ec);
rb_postponed_job_t *pjob;
int i, index;
begin:
index = vm->postponed_job_index;
for (i=0; i<index; i++) {
pjob = &vm->postponed_job_buffer[i];
if (pjob->func == func) {
RUBY_VM_SET_POSTPONED_JOB_INTERRUPT(ec);
return 2;
}
}
switch (postponed_job_register(ec, vm, flags, func, data, MAX_POSTPONED_JOB + MAX_POSTPONED_JOB_SPECIAL_ADDITION, index)) {
case PJRR_SUCESS : return 1;
case PJRR_FULL : return 0;
case PJRR_INTERRUPTED: goto begin;
default: rb_bug("unreachable\n");
}
}
void
rb_postponed_job_flush(rb_vm_t *vm)
{
rb_execution_context_t *ec = GET_EC();
const unsigned long block_mask = POSTPONED_JOB_INTERRUPT_MASK|TRAP_INTERRUPT_MASK;
volatile unsigned long saved_mask = ec->interrupt_mask & block_mask;
VALUE volatile saved_errno = ec->errinfo;
ec->errinfo = Qnil;
/* mask POSTPONED_JOB dispatch */
ec->interrupt_mask |= block_mask;
{
EC_PUSH_TAG(ec);
if (EXEC_TAG() == TAG_NONE) {
int index;
while ((index = vm->postponed_job_index) > 0) {
if (ATOMIC_CAS(vm->postponed_job_index, index, index-1) == index) {
rb_postponed_job_t *pjob = &vm->postponed_job_buffer[index-1];
(*pjob->func)(pjob->data);
}
}
}
EC_POP_TAG();
}
/* restore POSTPONED_JOB mask */
ec->interrupt_mask &= ~(saved_mask ^ block_mask);
ec->errinfo = saved_errno;
}
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