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Class: RubyVM

Relationships & Source Files
Namespace Children
Modules:
Classes:
Inherits: Object
Defined in: vm.c

Overview

The RubyVM module provides some access to Ruby internals. This module is for very limited purposes, such as debugging, prototyping, and research. Normal users must not use it.

Constant Summary

  • DEFAULT_PARAMS =

    This constant variable shows VM's default parameters. Note that changing these values does not affect VM execution. Specification is not stable and you should not depend on this value. Of course, this constant is MRI specific.

    # File 'vm.c', line 3132
    :
  • INSTRUCTION_NAMES =
    # File 'vm.c', line 3124
    :
  • OPTS =

    OPTS, which shows vm build options

    # File 'vm.c', line 3097
    :

Class Method Summary

Class Method Details

NSDR

This method is for internal use only.
[ GitHub ]

  
# File 'vm.c', line 2841

static VALUE
nsdr(void)
{
    VALUE ary = rb_ary_new();
#if HAVE_BACKTRACE
#include <execinfo.h>
#define MAX_NATIVE_TRACE 1024
    static void *trace[MAX_NATIVE_TRACE];
    int n = (int)backtrace(trace, MAX_NATIVE_TRACE);
    char **syms = backtrace_symbols(trace, n);
    int i;

    if (syms == 0) {
	rb_memerror();
    }

    for (i=0; i<n; i++) {
	rb_ary_push(ary, rb_str_new2(syms[i]));
    }
    free(syms); /* OK */
#endif
    return ary;
}

.reset_debug_counters

[ GitHub ]

.resolve_feature_path

[ GitHub ]

SDR

This method is for internal use only.
[ GitHub ]

  
# File 'vm.c', line 2833

static VALUE
sdr(void)
{
    rb_vm_bugreport(NULL);
    return Qnil;
}

.statHash .stat(hsh) ⇒ Hash .stat(Symbol) ⇒ Numeric

Returns a ::Hash containing implementation-dependent counters inside the VM.

This hash includes information about method/constant cache serials:

{
  :global_method_state=>251,
  :global_constant_state=>481,
  :class_serial=>9029
}

The contents of the hash are implementation specific and may be changed in the future.

This method is only expected to work on C Ruby.

[ GitHub ]

  
# File 'vm.c', line 435

static VALUE
vm_stat(int argc, VALUE *argv, VALUE self)
{
    static VALUE sym_global_method_state, sym_global_constant_state, sym_class_serial;
    VALUE arg = Qnil;
    VALUE hash = Qnil, key = Qnil;

    if (rb_check_arity(argc, 0, 1) == 1) {
        arg = argv[0];
	if (SYMBOL_P(arg))
	    key = arg;
	else if (RB_TYPE_P(arg, T_HASH))
	    hash = arg;
	else
	    rb_raise(rb_eTypeError, "non-hash or symbol given");
    }
    else {
	hash = rb_hash_new();
    }

    if (sym_global_method_state == 0) {
#define S(s) sym_##s = ID2SYM(rb_intern_const(#s))
	S(global_method_state);
	S(global_constant_state);
	S(class_serial);
#undef S
    }

#define SET(name, attr) \
    if (key == sym_##name) \
	return SERIALT2NUM(attr); \
    else if (hash != Qnil) \
	rb_hash_aset(hash, sym_##name, SERIALT2NUM(attr));

    SET(global_method_state, ruby_vm_global_method_state);
    SET(global_constant_state, ruby_vm_global_constant_state);
    SET(class_serial, ruby_vm_class_serial);
#undef SET

    if (!NIL_P(key)) { /* matched key should return above */
	rb_raise(rb_eArgError, "unknown key: %"PRIsVALUE, rb_sym2str(key));
    }

    return hash;
}

USAGE_ANALYSIS_INSN_STOP

This method is for internal use only.
[ GitHub ]

  
# File 'vm.c', line 3440

static VALUE
usage_analysis_insn_stop(VALUE self)
{
    ruby_vm_collect_usage_func_insn = 0;
    return Qnil;
}

USAGE_ANALYSIS_OPERAND_STOP

This method is for internal use only.
[ GitHub ]

  
# File 'vm.c', line 3448

static VALUE
usage_analysis_operand_stop(VALUE self)
{
    ruby_vm_collect_usage_func_operand = 0;
    return Qnil;
}

USAGE_ANALYSIS_REGISTER_STOP

This method is for internal use only.
[ GitHub ]

  
# File 'vm.c', line 3456

static VALUE
usage_analysis_register_stop(VALUE self)
{
    ruby_vm_collect_usage_func_register = 0;
    return Qnil;
}