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ruby/vm.c

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31 KiB
C
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/**********************************************************************
vm.c -
$Author$
$Date$
Copyright (C) 2004-2007 Koichi Sasada
**********************************************************************/
#include "ruby/ruby.h"
#include "ruby/node.h"
#include "ruby/st.h"
#include "gc.h"
#include "eval_intern.h"
#include "insnhelper.h"
#include "insnhelper.ci"
#define BUFSIZE 0x100
#define PROCDEBUG 0
VALUE rb_cEnv;
VALUE ruby_vm_global_state_version = 1;
void vm_analysis_operand(int insn, int n, VALUE op);
void vm_analysis_register(int reg, int isset);
void vm_analysis_insn(int insn);
VALUE vm_invoke_proc(rb_thread_t *th, rb_proc_t *proc,
VALUE self, int argc, VALUE *argv);
VALUE vm_eval_body(rb_thread_t *th);
static NODE *lfp_get_special_cref(VALUE *lfp);
static NODE *lfp_set_special_cref(VALUE *lfp, NODE * cref);
static inline int block_proc_is_lambda(VALUE procval);
#if OPT_STACK_CACHING
static VALUE yarv_finish_insn_seq[1] = { BIN(finish_SC_ax_ax) };
#elif OPT_CALL_THREADED_CODE
static VALUE const yarv_finish_insn_seq[1] = { 0 };
#else
static VALUE yarv_finish_insn_seq[1] = { BIN(finish) };
#endif
void
rb_vm_change_state(void)
{
INC_VM_STATE_VERSION();
}
/* control stack frame */
static inline VALUE
rb_vm_set_finish_env(rb_thread_t *th)
{
vm_push_frame(th, 0, FRAME_MAGIC_FINISH,
Qnil, th->cfp->lfp[0], 0,
th->cfp->sp, 0, 1);
th->cfp->pc = (VALUE *)&yarv_finish_insn_seq[0];
return Qtrue;
}
void
rb_vm_set_top_stack(rb_thread_t *th, VALUE iseqval)
{
rb_iseq_t *iseq;
GetISeqPtr(iseqval, iseq);
if (iseq->type != ISEQ_TYPE_TOP) {
rb_raise(rb_eTypeError, "Not a toplevel InstructionSequence");
}
/* for return */
rb_vm_set_finish_env(th);
vm_push_frame(th, iseq, FRAME_MAGIC_TOP,
th->top_self, 0, iseq->iseq_encoded,
th->cfp->sp, 0, iseq->local_size);
}
void
rb_vm_set_eval_stack(rb_thread_t *th, VALUE iseqval)
{
rb_iseq_t *iseq;
rb_block_t *block = th->base_block;
GetISeqPtr(iseqval, iseq);
/* for return */
rb_vm_set_finish_env(th);
vm_push_frame(th, iseq, FRAME_MAGIC_EVAL, block->self,
GC_GUARDED_PTR(block->dfp), iseq->iseq_encoded,
th->cfp->sp, block->lfp, iseq->local_size);
}
/* Env */
static void
env_free(void *ptr)
{
rb_env_t *env;
RUBY_FREE_ENTER("env");
if (ptr) {
env = ptr;
RUBY_FREE_UNLESS_NULL(env->env);
ruby_xfree(ptr);
}
RUBY_FREE_LEAVE("env");
}
static void
env_mark(void *ptr)
{
rb_env_t *env;
RUBY_MARK_ENTER("env");
if (ptr) {
env = ptr;
if (env->env) {
/* TODO: should mark more restricted range */
RUBY_GC_INFO("env->env\n");
rb_gc_mark_locations(env->env, env->env + env->env_size);
}
RUBY_GC_INFO("env->prev_envval\n");
RUBY_MARK_UNLESS_NULL(env->prev_envval);
RUBY_MARK_UNLESS_NULL(env->block.proc);
if (env->block.iseq) {
if (BUILTIN_TYPE(env->block.iseq) == T_NODE) {
RUBY_MARK_UNLESS_NULL((VALUE)env->block.iseq);
}
else {
RUBY_MARK_UNLESS_NULL(env->block.iseq->self);
}
}
}
RUBY_MARK_LEAVE("env");
}
static VALUE
env_alloc(void)
{
VALUE obj;
rb_env_t *env;
obj = Data_Make_Struct(rb_cEnv, rb_env_t, env_mark, env_free, env);
env->env = 0;
env->prev_envval = 0;
env->block.iseq = 0;
return obj;
}
static VALUE check_env_value(VALUE envval);
static int
check_env(rb_env_t *env)
{
printf("---\n");
printf("envptr: %p\n", &env->block.dfp[0]);
printf("orphan: %p\n", (void *)env->block.dfp[1]);
printf("inheap: %p\n", (void *)env->block.dfp[2]);
printf("envval: %10p ", (void *)env->block.dfp[3]);
dp(env->block.dfp[3]);
printf("penvv : %10p ", (void *)env->block.dfp[4]);
dp(env->block.dfp[4]);
printf("lfp: %10p\n", env->block.lfp);
printf("dfp: %10p\n", env->block.dfp);
if (env->block.dfp[4]) {
printf(">>\n");
check_env_value(env->block.dfp[4]);
printf("<<\n");
}
return 1;
}
static VALUE
check_env_value(VALUE envval)
{
rb_env_t *env;
GetEnvPtr(envval, env);
if (check_env(env)) {
return envval;
}
rb_bug("invalid env\n");
return Qnil; /* unreachable */
}
static VALUE
vm_make_env_each(rb_thread_t *th, rb_control_frame_t *cfp,
VALUE *envptr, VALUE *endptr)
{
VALUE envval, penvval = 0;
rb_env_t *env;
VALUE *nenvptr;
int i, local_size;
if (ENV_IN_HEAP_P(th, envptr)) {
return ENV_VAL(envptr);
}
if (envptr != endptr) {
VALUE *penvptr = GC_GUARDED_PTR_REF(*envptr);
rb_control_frame_t *pcfp = cfp;
if (ENV_IN_HEAP_P(th, penvptr)) {
penvval = ENV_VAL(penvptr);
}
else {
while (pcfp->dfp != penvptr) {
pcfp++;
if (pcfp->dfp == 0) {
SDR();
printf("[BUG] orz\n");
exit(0);
}
}
penvval = vm_make_env_each(th, pcfp, penvptr, endptr);
cfp->lfp = pcfp->lfp;
*envptr = GC_GUARDED_PTR(pcfp->dfp);
}
}
/* allocate env */
envval = env_alloc();
GetEnvPtr(envval, env);
if (!RUBY_VM_NORMAL_ISEQ_P(cfp->iseq)) {
local_size = 2;
}
else {
local_size = cfp->iseq->local_size;
}
env->env_size = local_size + 1 + 2;
env->local_size = local_size;
env->env = ALLOC_N(VALUE, env->env_size);
env->prev_envval = penvval;
for (i = 0; i <= local_size; i++) {
env->env[i] = envptr[-local_size + i];
// dp(env->env[i]);
if (RUBY_VM_NORMAL_ISEQ_P(cfp->iseq)) {
/* clear value stack for GC */
// envptr[-local_size + i] = 0;
}
}
*envptr = envval; /* GC mark */
nenvptr = &env->env[i - 1];
nenvptr[1] = envval; /* frame self */
nenvptr[2] = penvval; /* frame prev env object */
/* reset lfp/dfp in cfp */
cfp->dfp = nenvptr;
if (envptr == endptr) {
cfp->lfp = nenvptr;
}
/* as Binding */
env->block.self = cfp->self;
env->block.lfp = cfp->lfp;
env->block.dfp = cfp->dfp;
env->block.iseq = cfp->iseq;
if (VMDEBUG &&
(!(cfp->lfp[-1] == Qnil ||
BUILTIN_TYPE(cfp->lfp[-1]) == T_VALUES))) {
rb_bug("illegal svar");
}
if (!RUBY_VM_NORMAL_ISEQ_P(cfp->iseq)) {
/* TODO */
env->block.iseq = 0;
}
return envval;
}
static int
collect_local_variables_in_env(rb_env_t *env, VALUE ary)
{
int i;
if (env->block.lfp == env->block.dfp) {
return 0;
}
for (i = 0; i < env->block.iseq->local_table_size; i++) {
ID lid = env->block.iseq->local_table[i];
if (lid) {
rb_ary_push(ary, rb_str_new2(rb_id2name(lid)));
}
}
if (env->prev_envval) {
GetEnvPtr(env->prev_envval, env);
collect_local_variables_in_env(env, ary);
}
return 0;
}
int
vm_collect_local_variables_in_heap(rb_thread_t *th, VALUE *dfp, VALUE ary)
{
if (ENV_IN_HEAP_P(th, dfp)) {
rb_env_t *env;
GetEnvPtr(ENV_VAL(dfp), env);
collect_local_variables_in_env(env, ary);
return 1;
}
else {
return 0;
}
}
VALUE
vm_make_env_object(rb_thread_t *th, rb_control_frame_t *cfp)
{
VALUE envval;
envval = vm_make_env_each(th, cfp, cfp->dfp, cfp->lfp);
if (PROCDEBUG) {
check_env_value(envval);
}
return envval;
}
void
vm_stack_to_heap(rb_thread_t *th)
{
rb_control_frame_t *cfp = th->cfp;
while ((cfp = vm_get_ruby_level_cfp(th, cfp)) != 0) {
vm_make_env_object(th, cfp);
cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
}
}
/* Proc */
static VALUE
vm_make_proc_from_block(rb_thread_t *th, rb_control_frame_t *cfp,
rb_block_t *block)
{
VALUE procval;
rb_control_frame_t *bcfp;
VALUE *bdfp; /* to gc mark */
if (block->proc) {
return block->proc;
}
bcfp = RUBY_VM_GET_CFP_FROM_BLOCK_PTR(block);
bdfp = bcfp->dfp;
block->proc = procval = vm_make_proc(th, bcfp, block);
return procval;
}
VALUE
vm_make_proc(rb_thread_t *th,
rb_control_frame_t *cfp, rb_block_t *block)
{
VALUE procval, envval, blockprocval = 0;
rb_proc_t *proc;
if (GC_GUARDED_PTR_REF(cfp->lfp[0])) {
if (!RUBY_VM_CLASS_SPECIAL_P(cfp->lfp[0])) {
rb_proc_t *p;
blockprocval = vm_make_proc_from_block(
th, cfp, (rb_block_t *)GC_GUARDED_PTR_REF(*cfp->lfp));
GetProcPtr(blockprocval, p);
*cfp->lfp = GC_GUARDED_PTR(&p->block);
}
}
envval = vm_make_env_object(th, cfp);
if (PROCDEBUG) {
check_env_value(envval);
}
procval = rb_proc_alloc();
GetProcPtr(procval, proc);
proc->blockprocval = blockprocval;
proc->block.self = block->self;
proc->block.lfp = block->lfp;
proc->block.dfp = block->dfp;
proc->block.iseq = block->iseq;
proc->block.proc = procval;
proc->envval = envval;
proc->safe_level = th->safe_level;
proc->special_cref_stack = lfp_get_special_cref(block->lfp);
if (VMDEBUG) {
if (th->stack < block->dfp && block->dfp < th->stack + th->stack_size) {
rb_bug("invalid ptr: block->dfp");
}
if (th->stack < block->lfp && block->lfp < th->stack + th->stack_size) {
rb_bug("invalid ptr: block->lfp");
}
}
return procval;
}
/* C -> Ruby: method */
VALUE
vm_call0(rb_thread_t *th, VALUE klass, VALUE recv,
VALUE id, ID oid, int argc, const VALUE *argv,
NODE * body, int nosuper)
{
VALUE val;
rb_block_t *blockptr = 0;
if (0) printf("id: %s, nd: %s, argc: %d, passed: %p\n",
rb_id2name(id), ruby_node_name(nd_type(body)),
argc, th->passed_block);
if (th->passed_block) {
blockptr = th->passed_block;
th->passed_block = 0;
}
switch (nd_type(body)) {
case RUBY_VM_METHOD_NODE:{
rb_control_frame_t *reg_cfp;
VALUE iseqval = (VALUE)body->nd_body;
int i;
rb_vm_set_finish_env(th);
reg_cfp = th->cfp;
CHECK_STACK_OVERFLOW(reg_cfp, argc + 1);
*reg_cfp->sp++ = recv;
for (i = 0; i < argc; i++) {
*reg_cfp->sp++ = argv[i];
}
vm_setup_method(th, reg_cfp, argc, blockptr, 0, iseqval, recv, klass);
val = vm_eval_body(th);
break;
}
case NODE_CFUNC: {
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_CALL, recv, id, klass);
{
rb_control_frame_t *reg_cfp = th->cfp;
rb_control_frame_t *cfp =
vm_push_frame(th, 0, FRAME_MAGIC_CFUNC,
recv, (VALUE)blockptr, 0, reg_cfp->sp, 0, 1);
cfp->method_id = id;
cfp->method_klass = klass;
val = call_cfunc(body->nd_cfnc, recv, body->nd_argc, argc, argv);
if (reg_cfp != th->cfp + 1) {
SDR2(reg_cfp);
SDR2(th->cfp-5);
rb_bug("cfp consistency error - call0");
th->cfp = reg_cfp;
}
vm_pop_frame(th);
}
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, recv, id, klass);
break;
}
case NODE_ATTRSET:{
if (argc != 1) {
rb_raise(rb_eArgError, "wrong number of arguments (%d for 1)",
argc);
}
val = rb_ivar_set(recv, body->nd_vid, argv[0]);
break;
}
case NODE_IVAR: {
if (argc != 0) {
rb_raise(rb_eArgError, "wrong number of arguments (%d for 0)",
argc);
}
val = rb_attr_get(recv, body->nd_vid);
break;
}
case NODE_BMETHOD:{
val = vm_call_bmethod(th, id, body->nd_cval,
recv, klass, argc, (VALUE *)argv);
break;
}
default:
rb_bug("unsupported: vm_call0");
}
RUBY_VM_CHECK_INTS();
return val;
}
static VALUE
vm_call_super(rb_thread_t *th, int argc, const VALUE *argv)
{
VALUE recv = th->cfp->self;
VALUE klass;
ID id;
NODE *body;
int nosuper = 0;
rb_control_frame_t *cfp = th->cfp;
if (!th->cfp->iseq) {
klass = cfp->method_klass;
klass = RCLASS(klass)->super;
if (klass == 0) {
klass = vm_search_super_klass(cfp->method_klass, recv);
}
id = cfp->method_id;
}
else {
rb_bug("vm_call_super: should not be reached");
}
body = rb_method_node(klass, id); /* this returns NODE_METHOD */
if (body) {
body = body->nd_body;
}
else {
dp(recv);
dp(klass);
dpi(id);
rb_bug("vm_call_super: not found");
}
return vm_call0(th, klass, recv, id, id, argc, argv, body, nosuper);
}
VALUE
rb_call_super(int argc, const VALUE *argv)
{
return vm_call_super(GET_THREAD(), argc, argv);
}
/* C -> Ruby: block */
static VALUE
invoke_block(rb_thread_t *th, rb_block_t *block, VALUE self, int argc, VALUE *argv)
{
VALUE val;
if (BUILTIN_TYPE(block->iseq) != T_NODE) {
rb_iseq_t *iseq = block->iseq;
int i, opt_pc;
int type = block_proc_is_lambda(block->proc) ?
FRAME_MAGIC_LAMBDA : FRAME_MAGIC_BLOCK;
rb_vm_set_finish_env(th);
CHECK_STACK_OVERFLOW(th->cfp, argc);
CHECK_STACK_OVERFLOW(th->cfp, iseq->stack_max);
for (i=0; i<argc; i++) {
th->cfp->sp[i] = argv[i];
}
opt_pc = vm_yield_setup_args(th, iseq, argc, th->cfp->sp, type == FRAME_MAGIC_LAMBDA);
argc = iseq->arg_size;
th->cfp->sp += argc;
vm_push_frame(th, iseq, type,
self, GC_GUARDED_PTR(block->dfp),
iseq->iseq_encoded + opt_pc, th->cfp->sp, block->lfp,
iseq->local_size - argc);
val = vm_eval_body(th);
}
else {
if (((NODE*)block->iseq)->u3.state == 1) {
VALUE args = rb_ary_new4(argc, argv);
argc = 1;
argv = &args;
}
val = vm_yield_with_cfunc(th, block, block->self, argc, argv);
}
return val;
}
VALUE
vm_yield(rb_thread_t *th, int argc, VALUE *argv)
{
rb_block_t *block = GC_GUARDED_PTR_REF(th->cfp->lfp[0]);
if (block == 0) {
vm_localjump_error("no block given", Qnil, 0);
}
return invoke_block(th, block, block->self, argc, argv);
}
VALUE
vm_invoke_proc(rb_thread_t *th, rb_proc_t *proc,
VALUE self, int argc, VALUE *argv)
{
VALUE val = Qundef;
int state;
volatile int stored_safe = th->safe_level;
volatile NODE *stored_special_cref_stack =
lfp_set_special_cref(proc->block.lfp, proc->special_cref_stack);
rb_control_frame_t * volatile cfp = th->cfp;
TH_PUSH_TAG(th);
if ((state = EXEC_TAG()) == 0) {
th->safe_level = proc->safe_level;
val = invoke_block(th, &proc->block, self, argc, argv);
}
TH_POP_TAG();
th->safe_level = stored_safe;
lfp_set_special_cref(proc->block.lfp, (NODE*)stored_special_cref_stack);
if (state) {
if (state == TAG_RETURN && proc->is_lambda) {
VALUE err = th->errinfo;
VALUE *escape_dfp = GET_THROWOBJ_CATCH_POINT(err);
VALUE *cdfp = proc->block.dfp;
if (escape_dfp == cdfp) {
state = 0;
th->errinfo = Qnil;
th->cfp = cfp;
val = GET_THROWOBJ_VAL(err);
}
}
}
if (state) {
JUMP_TAG(state);
}
return val;
}
/* special variable */
VALUE *
vm_cfp_svar(rb_control_frame_t *cfp, int cnt)
{
while (cfp->pc == 0) {
cfp++;
}
return lfp_svar(cfp->lfp, cnt);
}
static VALUE *
vm_svar(rb_thread_t *th, int cnt)
{
rb_control_frame_t *cfp = th->cfp;
return vm_cfp_svar(cfp, cnt);
}
VALUE *
rb_svar(int cnt)
{
return vm_svar(GET_THREAD(), cnt);
}
VALUE
rb_backref_get(void)
{
VALUE *var = rb_svar(1);
if (var) {
return *var;
}
return Qnil;
}
void
rb_backref_set(VALUE val)
{
VALUE *var = rb_svar(1);
*var = val;
}
VALUE
rb_lastline_get(void)
{
VALUE *var = rb_svar(0);
if (var) {
return *var;
}
return Qnil;
}
void
rb_lastline_set(VALUE val)
{
VALUE *var = rb_svar(0);
*var = val;
}
/* backtrace */
int
vm_get_sourceline(rb_control_frame_t *cfp)
{
int line_no = 0;
rb_iseq_t *iseq = cfp->iseq;
if (RUBY_VM_NORMAL_ISEQ_P(iseq)) {
int i;
int pos = cfp->pc - cfp->iseq->iseq_encoded;
for (i = 0; i < iseq->insn_info_size; i++) {
if (iseq->insn_info_table[i].position == pos) {
line_no = iseq->insn_info_table[i - 1].line_no;
goto found;
}
}
line_no = iseq->insn_info_table[i - 1].line_no;
}
found:
return line_no;
}
static VALUE
vm_backtrace_each(rb_thread_t *th,
rb_control_frame_t *limit_cfp,
rb_control_frame_t *cfp,
char *file, int line_no, VALUE ary)
{
VALUE str;
while (cfp > limit_cfp) {
str = 0;
if (cfp->iseq != 0) {
if (cfp->pc != 0) {
rb_iseq_t *iseq = cfp->iseq;
line_no = vm_get_sourceline(cfp);
file = RSTRING_PTR(iseq->filename);
str = rb_sprintf("%s:%d:in `%s'",
file, line_no, RSTRING_PTR(iseq->name));
rb_ary_push(ary, str);
}
}
else if (RUBYVM_CFUNC_FRAME_P(cfp)) {
str = rb_sprintf("%s:%d:in `%s'",
file, line_no,
rb_id2name(cfp->method_id));
rb_ary_push(ary, str);
}
cfp = RUBY_VM_NEXT_CONTROL_FRAME(cfp);
}
return rb_ary_reverse(ary);
}
VALUE
vm_backtrace(rb_thread_t *th, int lev)
{
VALUE ary;
rb_control_frame_t *cfp = th->cfp;
rb_control_frame_t *top_of_cfp = (void *)(th->stack + th->stack_size);
top_of_cfp -= 2;
if (lev < 0) {
/* TODO ?? */
ary = rb_ary_new();
}
else {
while (lev-- >= 0) {
cfp++;
if (cfp >= top_of_cfp) {
return Qnil;
}
}
ary = rb_ary_new();
}
ary = vm_backtrace_each(th, RUBY_VM_NEXT_CONTROL_FRAME(cfp),
top_of_cfp, "", 0, ary);
return ary;
}
/* cref */
static void
check_svar(void)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
while ((void *)(cfp + 1) < (void *)(th->stack + th->stack_size)) {
/* printf("cfp: %p\n", cfp->type); */
if (cfp->lfp && cfp->lfp[-1] != Qnil &&
TYPE(cfp->lfp[-1]) != T_VALUES) {
/* dp(cfp->lfp[-1]); */
rb_bug("!!!illegal svar!!!");
}
cfp++;
}
}
static NODE *
lfp_set_special_cref(VALUE *lfp, NODE * cref)
{
struct RValues *values = (void *) lfp[-1];
VALUE *pv;
NODE *old_cref;
if (VMDEBUG) {
check_svar();
}
if (cref == 0 && ((VALUE)values == Qnil || values->basic.klass == 0)) {
old_cref = 0;
}
else {
pv = lfp_svar(lfp, -1);
old_cref = (NODE *) * pv;
*pv = (VALUE)cref;
}
return old_cref;
}
NODE *
vm_set_special_cref(rb_thread_t *th, VALUE *lfp, NODE * cref_stack)
{
return lfp_set_special_cref(lfp, cref_stack);
}
#if 0
void
debug_cref(NODE *cref)
{
while (cref) {
dp(cref->nd_clss);
printf("%ld\n", cref->nd_visi);
cref = cref->nd_next;
}
}
#endif
NODE *
vm_get_cref(rb_thread_t *th, rb_iseq_t *iseq, rb_control_frame_t *cfp)
{
return get_cref(iseq, cfp->lfp);
}
NODE *
vm_cref_push(rb_thread_t *th, VALUE klass, int noex)
{
NODE *cref = NEW_BLOCK(klass);
rb_control_frame_t *cfp = vm_get_ruby_level_cfp(th, th->cfp);
cref->nd_file = 0;
cref->nd_next = get_cref(cfp->iseq, cfp->lfp);
cref->nd_visi = noex;
return cref;
}
VALUE
vm_get_cbase(rb_thread_t *th)
{
rb_control_frame_t *cfp = vm_get_ruby_level_cfp(th, th->cfp);
NODE *cref = get_cref(cfp->iseq, cfp->lfp);
VALUE klass = Qundef;
while (cref) {
if ((klass = cref->nd_clss) != 0) {
break;
}
cref = cref->nd_next;
}
return klass;
}
/* jump */
static VALUE
make_localjump_error(const char *mesg, VALUE value, int reason)
{
extern VALUE rb_eLocalJumpError;
VALUE exc = rb_exc_new2(rb_eLocalJumpError, mesg);
ID id;
switch (reason) {
case TAG_BREAK:
id = rb_intern("break");
break;
case TAG_REDO:
id = rb_intern("redo");
break;
case TAG_RETRY:
id = rb_intern("retry");
break;
case TAG_NEXT:
id = rb_intern("next");
break;
case TAG_RETURN:
id = rb_intern("return");
break;
default:
id = rb_intern("noreason");
break;
}
rb_iv_set(exc, "@exit_value", value);
rb_iv_set(exc, "@reason", ID2SYM(id));
return exc;
}
void
vm_localjump_error(const char *mesg, VALUE value, int reason)
{
VALUE exc = make_localjump_error(mesg, value, reason);
rb_exc_raise(exc);
}
VALUE
vm_make_jump_tag_but_local_jump(int state, VALUE val)
{
VALUE result = Qnil;
if (val == Qundef)
val = GET_THREAD()->tag->retval;
switch (state) {
case 0:
break;
case TAG_RETURN:
result = make_localjump_error("unexpected return", val, state);
break;
case TAG_BREAK:
result = make_localjump_error("unexpected break", val, state);
break;
case TAG_NEXT:
result = make_localjump_error("unexpected next", val, state);
break;
case TAG_REDO:
result = make_localjump_error("unexpected redo", Qnil, state);
break;
case TAG_RETRY:
result = make_localjump_error("retry outside of rescue clause", Qnil, state);
break;
default:
break;
}
return result;
}
void
vm_jump_tag_but_local_jump(int state, VALUE val)
{
VALUE exc = vm_make_jump_tag_but_local_jump(state, val);
if (val != Qnil) {
rb_exc_raise(exc);
}
JUMP_TAG(state);
}
NORETURN(static void vm_iter_break(rb_thread_t *th));
static void
vm_iter_break(rb_thread_t *th)
{
rb_control_frame_t *cfp = th->cfp;
VALUE *dfp = GC_GUARDED_PTR_REF(*cfp->dfp);
th->state = TAG_BREAK;
th->errinfo = (VALUE)NEW_THROW_OBJECT(Qnil, (VALUE)dfp, TAG_BREAK);
TH_JUMP_TAG(th, TAG_BREAK);
}
void
rb_iter_break()
{
vm_iter_break(GET_THREAD());
}
/* optimization: redefine management */
VALUE ruby_vm_redefined_flag = 0;
static st_table *vm_opt_method_table = 0;
void
rb_vm_check_redefinition_opt_method(NODE *node)
{
VALUE bop;
if (st_lookup(vm_opt_method_table, (st_data_t)node, &bop)) {
ruby_vm_redefined_flag |= bop;
}
}
static void
add_opt_method(VALUE klass, ID mid, VALUE bop)
{
NODE *node;
if (st_lookup(RCLASS(klass)->m_tbl, mid, (void *)&node) &&
nd_type(node->nd_body->nd_body) == NODE_CFUNC) {
st_insert(vm_opt_method_table, (st_data_t)node, (st_data_t)bop);
}
else {
rb_bug("undefined optimized method: %s", rb_id2name(mid));
}
}
void
yarv_init_redefined_flag(void)
{
const VALUE register_info[] = {
idPLUS, BOP_PLUS, rb_cFixnum, rb_cFloat, rb_cString, rb_cArray, 0,
idMINUS, BOP_MINUS, rb_cFixnum, 0,
idMULT, BOP_MULT, rb_cFixnum, rb_cFloat, 0,
idDIV, BOP_DIV, rb_cFixnum, rb_cFloat, 0,
idMOD, BOP_MOD, rb_cFixnum, rb_cFloat, 0,
idEq, BOP_EQ, rb_cFixnum, rb_cFloat, rb_cString, 0,
idLT, BOP_LT, rb_cFixnum, 0,
idLE, BOP_LE, rb_cFixnum, 0,
idLTLT, BOP_LTLT, rb_cString, rb_cArray, 0,
idAREF, BOP_AREF, rb_cArray, rb_cHash, 0,
idASET, BOP_ASET, rb_cArray, rb_cHash, 0,
idLength, BOP_LENGTH, rb_cArray, rb_cString, rb_cHash, 0,
idSucc, BOP_SUCC, rb_cFixnum, rb_cString, rb_cTime, 0,
idGT, BOP_GT, rb_cFixnum, 0,
idGE, BOP_GE, rb_cFixnum, 0,
0,
};
const VALUE *ptr = register_info;
vm_opt_method_table = st_init_numtable();
while (*ptr) {
ID mid = *ptr++;
VALUE bop = *ptr++;
while(*ptr) {
VALUE klass = *ptr++;
add_opt_method(klass, mid, bop);
}
ptr++;
}
}
/* evaluator body */
#include "vm_evalbody.ci"
/* finish
VMe (h1) finish
VM finish F1 F2
func finish F1 F2 C1
rb_funcall finish F1 F2 C1
VMe finish F1 F2 C1
VM finish F1 F2 C1 F3
F1 - F3 : pushed by VM
C1 : pushed by send insn (CFUNC)
struct CONTROL_FRAME {
VALUE *pc; // cfp[0]
VALUE *sp; // cfp[1]
VALUE *bp; // cfp[2]
rb_iseq_t *iseq; // cfp[3]
VALUE flag; // cfp[4]
VALUE self; // cfp[5]
VALUE *lfp; // cfp[6]
VALUE *dfp; // cfp[7]
rb_iseq_t * block_iseq; // cfp[8]
VALUE proc; // cfp[9] always 0
};
struct BLOCK {
VALUE self;
VALUE *lfp;
VALUE *dfp;
rb_iseq_t *block_iseq;
};
struct PROC {
VALUE proc_sig = 0;
struct BLOCK;
};
struct METHOD_CONTROL_FRAME {
struct CONTROL_FRAME;
};
struct METHOD_FRAME {
VALUE arg0;
...
VALUE argM;
VALUE param0;
...
VALUE paramN;
VALUE special; // lfp [1]
struct block_object *block_ptr | 0x01; // lfp [0]
};
struct BLOCK_CONTROL_FRAME {
struct STACK_FRAME;
};
struct BLOCK_FRAME {
VALUE arg0;
...
VALUE argM;
VALUE param0;
...
VALUE paramN;
VALUE *(prev_ptr | 0x01); // DFP[0]
};
struct CLASS_CONTROL_FRAME {
struct STACK_FRAME;
};
struct CLASS_FRAME {
VALUE param0;
...
VALUE paramN;
VALUE prev_dfp; // for frame jump
};
struct C_METHOD_CONTROL_FRAME {
VALUE *pc; // 0
VALUE *sp; // stack pointer
VALUE *bp; // base pointer (used in exception)
rb_iseq_t *iseq; // cmi
VALUE magic; // C_METHOD_FRAME
VALUE self; // ?
VALUE *lfp; // lfp
VALUE *dfp; // == lfp
rb_iseq_t * block_iseq; //
VALUE proc; // always 0
};
struct C_BLOCK_CONTROL_FRAME {
VALUE *pc; // point only "finish" insn
VALUE *sp; // sp
rb_iseq_t *iseq; // ?
VALUE magic; // C_METHOD_FRAME
VALUE self; // needed?
VALUE *lfp; // lfp
VALUE *dfp; // lfp
rb_iseq_t * block_iseq; // 0
};
struct C_METHDO_FRAME{
VALUE block_ptr;
VALUE special;
};
*/
VALUE
vm_eval_body(rb_thread_t *th)
{
int state;
VALUE result, err;
VALUE initial = 0;
TH_PUSH_TAG(th);
if ((state = EXEC_TAG()) == 0) {
vm_loop_start:
result = vm_eval(th, initial);
if ((state = th->state) != 0) {
err = result;
th->state = 0;
goto exception_handler;
}
}
else {
int i;
struct iseq_catch_table_entry *entry;
unsigned long epc, cont_pc, cont_sp;
VALUE catch_iseqval;
rb_control_frame_t *cfp;
VALUE *escape_dfp = NULL;
VALUE type;
err = th->errinfo;
if (state == TAG_RAISE) {
rb_ivar_set(err, idThrowState, INT2FIX(state));
}
exception_handler:
cont_pc = cont_sp = catch_iseqval = 0;
while (th->cfp->pc == 0 || th->cfp->iseq == 0) {
th->cfp++;
}
cfp = th->cfp;
epc = cfp->pc - cfp->iseq->iseq_encoded;
if (state == TAG_BREAK || state == TAG_RETURN) {
escape_dfp = GET_THROWOBJ_CATCH_POINT(err);
if (cfp->dfp == escape_dfp) {
if (state == TAG_RETURN) {
if ((cfp + 1)->pc != &yarv_finish_insn_seq[0]) {
SET_THROWOBJ_CATCH_POINT(err, (VALUE)(cfp + 1)->dfp);
SET_THROWOBJ_STATE(err, state = TAG_BREAK);
}
else {
result = GET_THROWOBJ_VAL(err);
th->errinfo = Qnil;
th->cfp += 2;
goto finish_vme;
}
/* through */
}
else {
/* TAG_BREAK */
#if OPT_STACK_CACHING
initial = (GET_THROWOBJ_VAL(err));
#else
*th->cfp->sp++ = (GET_THROWOBJ_VAL(err));
#endif
th->errinfo = Qnil;
goto vm_loop_start;
}
}
}
if (state == TAG_RAISE) {
for (i = 0; i < cfp->iseq->catch_table_size; i++) {
entry = &cfp->iseq->catch_table[i];
if (entry->start < epc && entry->end >= epc) {
if (entry->type == CATCH_TYPE_RESCUE ||
entry->type == CATCH_TYPE_ENSURE) {
catch_iseqval = entry->iseq;
cont_pc = entry->cont;
cont_sp = entry->sp;
break;
}
}
}
}
else if (state == TAG_RETRY) {
for (i = 0; i < cfp->iseq->catch_table_size; i++) {
entry = &cfp->iseq->catch_table[i];
if (entry->start < epc && entry->end >= epc) {
if (entry->type == CATCH_TYPE_ENSURE) {
catch_iseqval = entry->iseq;
cont_pc = entry->cont;
cont_sp = entry->sp;
break;
}
else if (entry->type == CATCH_TYPE_RETRY) {
VALUE *escape_dfp;
escape_dfp = GET_THROWOBJ_CATCH_POINT(err);
if (cfp->dfp == escape_dfp) {
cfp->pc = cfp->iseq->iseq_encoded + entry->cont;
th->errinfo = Qnil;
goto vm_loop_start;
}
}
}
}
}
else if (state == TAG_BREAK && ((VALUE)escape_dfp & ~0x03) == 0) {
type = CATCH_TYPE_BREAK;
search_restart_point:
for (i = 0; i < cfp->iseq->catch_table_size; i++) {
entry = &cfp->iseq->catch_table[i];
if (entry->start < epc && entry->end >= epc) {
if (entry->type == CATCH_TYPE_ENSURE) {
catch_iseqval = entry->iseq;
cont_pc = entry->cont;
cont_sp = entry->sp;
break;
}
else if (entry->type == type) {
cfp->pc = cfp->iseq->iseq_encoded + entry->cont;
cfp->sp = cfp->bp + entry->sp;
if (!(state == TAG_REDO) &&
!(state == TAG_NEXT && !escape_dfp) &&
!(state == TAG_BREAK && !escape_dfp)) {
#if OPT_STACK_CACHING
initial = (GET_THROWOBJ_VAL(err));
#else
*th->cfp->sp++ = (GET_THROWOBJ_VAL(err));
#endif
}
th->errinfo = Qnil;
goto vm_loop_start;
}
}
}
}
else if (state == TAG_REDO) {
type = CATCH_TYPE_REDO;
escape_dfp = GET_THROWOBJ_CATCH_POINT(err);
goto search_restart_point;
}
else if (state == TAG_NEXT) {
type = CATCH_TYPE_NEXT;
escape_dfp = GET_THROWOBJ_CATCH_POINT(err);
goto search_restart_point;
}
else {
for (i = 0; i < cfp->iseq->catch_table_size; i++) {
entry = &cfp->iseq->catch_table[i];
if (entry->start < epc && entry->end >= epc) {
if (entry->type == CATCH_TYPE_ENSURE) {
catch_iseqval = entry->iseq;
cont_pc = entry->cont;
cont_sp = entry->sp;
break;
}
}
}
}
if (catch_iseqval != 0) {
/* found catch table */
rb_iseq_t *catch_iseq;
/* enter catch scope */
GetISeqPtr(catch_iseqval, catch_iseq);
cfp->sp = cfp->bp + cont_sp;
cfp->pc = cfp->iseq->iseq_encoded + cont_pc;
/* push block frame */
cfp->sp[0] = err;
vm_push_frame(th, catch_iseq, FRAME_MAGIC_BLOCK,
cfp->self, (VALUE)cfp->dfp, catch_iseq->iseq_encoded,
cfp->sp + 1, cfp->lfp, catch_iseq->local_size - 1);
state = 0;
th->errinfo = Qnil;
goto vm_loop_start;
}
else {
th->cfp++;
if (th->cfp->pc != &yarv_finish_insn_seq[0]) {
goto exception_handler;
}
else {
vm_pop_frame(th);
th->errinfo = err;
TH_POP_TAG2();
JUMP_TAG(state);
}
}
}
finish_vme:
TH_POP_TAG();
return result;
}
/* misc */
VALUE
rb_thread_eval(rb_thread_t *th, VALUE iseqval)
{
VALUE val;
volatile VALUE tmp;
rb_vm_set_top_stack(th, iseqval);
if (!rb_const_defined(rb_cObject, rb_intern("TOPLEVEL_BINDING"))) {
rb_define_global_const("TOPLEVEL_BINDING", rb_binding_new());
}
val = vm_eval_body(th);
tmp = iseqval; /* prohibit tail call optimization */
return val;
}
int
rb_thread_method_id_and_klass(rb_thread_t *th, ID *idp, VALUE *klassp)
{
rb_control_frame_t *cfp = th->cfp;
if (cfp->iseq) {
if (cfp->pc != 0) {
rb_iseq_t *iseq = cfp->iseq->local_iseq;
if (idp) *idp = rb_intern(RSTRING_PTR(iseq->name));
if (klassp) *klassp = iseq->klass;
return 1;
}
}
else {
if (idp) *idp = cfp->method_id;
if (klassp) *klassp = cfp->method_klass;
return 1;
}
*idp = *klassp = 0;
return 0;
}
VALUE
rb_thread_current_status(rb_thread_t *th)
{
rb_control_frame_t *cfp = th->cfp;
VALUE str = Qnil;
if (cfp->iseq != 0) {
if (cfp->pc != 0) {
rb_iseq_t *iseq = cfp->iseq;
int line_no = vm_get_sourceline(cfp);
char *file = RSTRING_PTR(iseq->filename);
str = rb_sprintf("%s:%d:in `%s'",
file, line_no, RSTRING_PTR(iseq->name));
}
}
else if (cfp->method_id) {
str = rb_sprintf("`%s#%s' (cfunc)",
RSTRING_PTR(rb_class_name(cfp->method_klass)),
rb_id2name(cfp->method_id));
}
return str;
}
VALUE
rb_vm_call_cfunc(VALUE recv, VALUE (*func)(VALUE), VALUE arg, rb_block_t *blockptr, VALUE filename)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *reg_cfp = th->cfp;
volatile VALUE iseq = rb_iseq_new(0, filename, filename, 0, ISEQ_TYPE_TOP);
VALUE val;
vm_push_frame(th, DATA_PTR(iseq), FRAME_MAGIC_TOP,
recv, (VALUE)blockptr, 0, reg_cfp->sp, 0, 1);
val = (*func)(arg);
vm_pop_frame(th);
return val;
}
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