From 104b009e26c050584e4d186c8cc4e1496a14061b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 5 Aug 2021 20:09:25 +0900
Subject: [PATCH] Get rid of type-punning pointer casts [Bug #18062]
---
vm_eval.c | 4 +++-
vm_insnhelper.c | 7 +++++--
vm_method.c | 41 ++++++++++++++++++++++++++---------------
3 files changed, 34 insertions(+), 18 deletions(-)
diff --git a/vm_eval.c b/vm_eval.c
index 6d4b5c3c0b28..7ce9f157e671 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -350,9 +350,11 @@ cc_new(VALUE klass, ID mid, int argc, const rb_callable_method_entry_t *cme)
{
struct rb_class_cc_entries *ccs;
struct rb_id_table *cc_tbl = RCLASS_CC_TBL(klass);
+ VALUE ccs_data;
- if (rb_id_table_lookup(cc_tbl, mid, (VALUE*)&ccs)) {
+ if (rb_id_table_lookup(cc_tbl, mid, &ccs_data)) {
// ok
+ ccs = (struct rb_class_cc_entries *)ccs_data;
}
else {
ccs = vm_ccs_create(klass, cme);
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 14928b2afe8e..e186376b24d7 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -1637,9 +1637,11 @@ vm_search_cc(const VALUE klass, const struct rb_callinfo * const ci)
const ID mid = vm_ci_mid(ci);
struct rb_id_table *cc_tbl = RCLASS_CC_TBL(klass);
struct rb_class_cc_entries *ccs = NULL;
+ VALUE ccs_data;
if (cc_tbl) {
- if (rb_id_table_lookup(cc_tbl, mid, (VALUE *)&ccs)) {
+ if (rb_id_table_lookup(cc_tbl, mid, &ccs_data)) {
+ ccs = (struct rb_class_cc_entries *)ccs_data;
const int ccs_len = ccs->len;
VM_ASSERT(vm_ccs_verify(ccs, mid, klass));
@@ -1706,8 +1708,9 @@ vm_search_cc(const VALUE klass, const struct rb_callinfo * const ci)
if (ccs == NULL) {
VM_ASSERT(cc_tbl != NULL);
- if (LIKELY(rb_id_table_lookup(cc_tbl, mid, (VALUE*)&ccs))) {
+ if (LIKELY(rb_id_table_lookup(cc_tbl, mid, &ccs_data))) {
// rb_callable_method_entry() prepares ccs.
+ ccs = (struct rb_class_cc_entries *)ccs_data;
}
else {
// TODO: required?
diff --git a/vm_method.c b/vm_method.c
index 016dba1dbb18..1fd0bd57f7ca 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -42,11 +42,11 @@ vm_ccs_dump(VALUE klass, ID target_mid)
{
struct rb_id_table *cc_tbl = RCLASS_CC_TBL(klass);
if (cc_tbl) {
- const struct rb_class_cc_entries *ccs;
+ VALUE ccs;
if (target_mid) {
- if (rb_id_table_lookup(cc_tbl, target_mid, (VALUE *)&ccs)) {
+ if (rb_id_table_lookup(cc_tbl, target_mid, &ccs)) {
fprintf(stderr, " [CCTB] %p\n", (void *)cc_tbl);
- vm_ccs_dump_i(target_mid, (VALUE)ccs, NULL);
+ vm_ccs_dump_i(target_mid, ccs, NULL);
}
}
else {
@@ -72,11 +72,11 @@ vm_mtbl_dump(VALUE klass, ID target_mid)
fprintf(stderr, "# vm_mtbl\n");
while (klass) {
rp_m(" -> ", klass);
- rb_method_entry_t *me;
+ VALUE me;
if (RCLASS_M_TBL(klass)) {
if (target_mid != 0) {
- if (rb_id_table_lookup(RCLASS_M_TBL(klass), target_mid, (VALUE *)&me)) {
+ if (rb_id_table_lookup(RCLASS_M_TBL(klass), target_mid, &me)) {
rp_m(" [MTBL] ", me);
}
}
@@ -90,7 +90,7 @@ vm_mtbl_dump(VALUE klass, ID target_mid)
}
if (RCLASS_CALLABLE_M_TBL(klass)) {
if (target_mid != 0) {
- if (rb_id_table_lookup(RCLASS_CALLABLE_M_TBL(klass), target_mid, (VALUE *)&me)) {
+ if (rb_id_table_lookup(RCLASS_CALLABLE_M_TBL(klass), target_mid, &me)) {
rp_m(" [CM**] ", me);
}
}
@@ -144,10 +144,11 @@ clear_method_cache_by_id_in_class(VALUE klass, ID mid)
// check only current class
struct rb_id_table *cc_tbl = RCLASS_CC_TBL(klass);
- struct rb_class_cc_entries *ccs;
+ VALUE ccs_data;
// invalidate CCs
- if (cc_tbl && rb_id_table_lookup(cc_tbl, mid, (VALUE *)&ccs)) {
+ if (cc_tbl && rb_id_table_lookup(cc_tbl, mid, &ccs_data)) {
+ struct rb_class_cc_entries *ccs = (struct rb_class_cc_entries *)ccs_data;
rb_vm_ccs_free(ccs);
rb_id_table_delete(cc_tbl, mid);
RB_DEBUG_COUNTER_INC(cc_invalidate_leaf_ccs);
@@ -205,9 +206,10 @@ clear_method_cache_by_id_in_class(VALUE klass, ID mid)
}
else {
rb_vm_t *vm = GET_VM();
- if (rb_id_table_lookup(vm->negative_cme_table, mid, (VALUE *)&cme)) {
+ VALUE cme_data = (VALUE) cme;
+ if (rb_id_table_lookup(vm->negative_cme_table, mid, &cme_data)) {
rb_id_table_delete(vm->negative_cme_table, mid);
- vm_me_invalidate_cache((rb_callable_method_entry_t *)cme);
+ vm_me_invalidate_cache((rb_callable_method_entry_t *)cme_data);
RB_DEBUG_COUNTER_INC(cc_invalidate_negative);
}
@@ -1023,6 +1025,7 @@ prepare_callable_method_entry(VALUE defined_class, ID id, const rb_method_entry_
{
struct rb_id_table *mtbl;
const rb_callable_method_entry_t *cme;
+ VALUE cme_data;
if (me) {
if (me->defined_class == 0) {
@@ -1032,7 +1035,8 @@ prepare_callable_method_entry(VALUE defined_class, ID id, const rb_method_entry_
mtbl = RCLASS_CALLABLE_M_TBL(defined_class);
- if (mtbl && rb_id_table_lookup(mtbl, id, (VALUE *)&cme)) {
+ if (mtbl && rb_id_table_lookup(mtbl, id, &cme_data)) {
+ cme = (rb_callable_method_entry_t *)cme_data;
RB_DEBUG_COUNTER_INC(mc_cme_complement_hit);
VM_ASSERT(callable_method_entry_p(cme));
VM_ASSERT(!METHOD_ENTRY_INVALIDATED(cme));
@@ -1076,9 +1080,10 @@ cached_callable_method_entry(VALUE klass, ID mid)
ASSERT_vm_locking();
struct rb_id_table *cc_tbl = RCLASS_CC_TBL(klass);
- struct rb_class_cc_entries *ccs;
+ VALUE ccs_data;
- if (cc_tbl && rb_id_table_lookup(cc_tbl, mid, (VALUE *)&ccs)) {
+ if (cc_tbl && rb_id_table_lookup(cc_tbl, mid, &ccs_data)) {
+ struct rb_class_cc_entries *ccs = (struct rb_class_cc_entries *)ccs_data;
VM_ASSERT(vm_ccs_p(ccs));
if (LIKELY(!METHOD_ENTRY_INVALIDATED(ccs->cme))) {
@@ -1104,12 +1109,14 @@ cache_callable_method_entry(VALUE klass, ID mid, const rb_callable_method_entry_
struct rb_id_table *cc_tbl = RCLASS_CC_TBL(klass);
struct rb_class_cc_entries *ccs;
+ VALUE ccs_data;
if (!cc_tbl) {
cc_tbl = RCLASS_CC_TBL(klass) = rb_id_table_create(2);
}
- if (rb_id_table_lookup(cc_tbl, mid, (VALUE *)&ccs)) {
+ if (rb_id_table_lookup(cc_tbl, mid, &ccs_data)) {
+ ccs = (struct rb_class_cc_entries *)ccs_data;
VM_ASSERT(ccs->cme == cme);
}
else {
@@ -1123,8 +1130,12 @@ negative_cme(ID mid)
{
rb_vm_t *vm = GET_VM();
const rb_callable_method_entry_t *cme;
+ VALUE cme_data;
- if (!rb_id_table_lookup(vm->negative_cme_table, mid, (VALUE *)&cme)) {
+ if (rb_id_table_lookup(vm->negative_cme_table, mid, &cme_data)) {
+ cme = (rb_callable_method_entry_t *)cme_data;
+ }
+ else {
cme = (rb_callable_method_entry_t *)rb_method_entry_alloc(mid, Qnil, Qnil, NULL);
rb_id_table_insert(vm->negative_cme_table, mid, (VALUE)cme);
}