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authorSverker Eriksson <[email protected]>2017-02-14 18:26:31 +0100
committerSverker Eriksson <[email protected]>2017-02-14 18:26:31 +0100
commit118de47d703e303aea7f4575849a37c11416ba14 (patch)
tree211bbb6c24d6069c657d3b7ac7776be45631ec48 /erts
parentdd60ebfa1f2f6dc203deee59f95305291d06a619 (diff)
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erts: Add deallocation veto for magic destructors
A magic destructor can return 0 and thereby take control and prolong the lifetime of a magic binary.
Diffstat (limited to 'erts')
-rw-r--r--erts/emulator/beam/beam_load.c5
-rw-r--r--erts/emulator/beam/binary.c6
-rw-r--r--erts/emulator/beam/dist.c4
-rw-r--r--erts/emulator/beam/dist.h2
-rw-r--r--erts/emulator/beam/erl_bif_binary.c15
-rw-r--r--erts/emulator/beam/erl_bif_info.c4
-rw-r--r--erts/emulator/beam/erl_bif_re.c3
-rw-r--r--erts/emulator/beam/erl_binary.h19
-rw-r--r--erts/emulator/beam/erl_db_util.c5
-rw-r--r--erts/emulator/beam/erl_db_util.h2
-rw-r--r--erts/emulator/beam/erl_map.c3
-rw-r--r--erts/emulator/beam/erl_nif.c3
-rw-r--r--erts/emulator/beam/erl_ptab.c6
-rw-r--r--erts/emulator/beam/erl_unicode.c3
-rw-r--r--erts/emulator/beam/external.c6
-rw-r--r--erts/emulator/hipe/hipe_load.c3
16 files changed, 54 insertions, 35 deletions
diff --git a/erts/emulator/beam/beam_load.c b/erts/emulator/beam/beam_load.c
index e75e7afd54..48206a75a8 100644
--- a/erts/emulator/beam/beam_load.c
+++ b/erts/emulator/beam/beam_load.c
@@ -488,7 +488,7 @@ typedef struct LoaderState {
static void free_loader_state(Binary* magic);
static ErlHeapFragment* new_literal_fragment(Uint size);
static void free_literal_fragment(ErlHeapFragment*);
-static void loader_state_dtor(Binary* magic);
+static int loader_state_dtor(Binary* magic);
#ifdef HIPE
static Eterm stub_insert_new_code(Process *c_p, ErtsProcLocks c_p_locks,
Eterm group_leader, Eterm module,
@@ -1026,7 +1026,7 @@ static void free_literal_fragment(ErlHeapFragment* bp)
/*
* This destructor function can safely be called multiple times.
*/
-static void
+static int
loader_state_dtor(Binary* magic)
{
LoaderState* stp = ERTS_MAGIC_BIN_DATA(magic);
@@ -1111,6 +1111,7 @@ loader_state_dtor(Binary* magic)
*/
ASSERT(stp->genop_blocks == 0);
+ return 1;
}
#ifdef HIPE
diff --git a/erts/emulator/beam/binary.c b/erts/emulator/beam/binary.c
index d38097fb12..be43f6e1ac 100644
--- a/erts/emulator/beam/binary.c
+++ b/erts/emulator/beam/binary.c
@@ -350,9 +350,10 @@ typedef struct {
Uint bitoffs;
} ErtsB2LState;
-static void b2l_state_destructor(Binary *mbp)
+static int b2l_state_destructor(Binary *mbp)
{
ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(mbp) == b2l_state_destructor);
+ return 1;
}
static BIF_RETTYPE
@@ -723,12 +724,13 @@ list_to_binary_engine(ErtsL2BState *sp)
}
}
-static void
+static int
l2b_state_destructor(Binary *mbp)
{
ErtsL2BState *sp = ERTS_MAGIC_BIN_DATA(mbp);
ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(mbp) == l2b_state_destructor);
DESTROY_SAVED_ESTACK(&sp->buf.iolist.estack);
+ return 1;
}
static ERTS_INLINE Eterm
diff --git a/erts/emulator/beam/dist.c b/erts/emulator/beam/dist.c
index 390f2a0db3..da1083100b 100644
--- a/erts/emulator/beam/dist.c
+++ b/erts/emulator/beam/dist.c
@@ -713,7 +713,7 @@ static void clear_dist_entry(DistEntry *dep)
}
}
-void erts_dsend_context_dtor(Binary* ctx_bin)
+int erts_dsend_context_dtor(Binary* ctx_bin)
{
ErtsSendContext* ctx = ERTS_MAGIC_BIN_DATA(ctx_bin);
switch (ctx->dss.phase) {
@@ -730,6 +730,8 @@ void erts_dsend_context_dtor(Binary* ctx_bin)
}
if (ctx->dep_to_deref)
erts_deref_dist_entry(ctx->dep_to_deref);
+
+ return 1;
}
Eterm erts_dsend_export_trap_context(Process* p, ErtsSendContext* ctx)
diff --git a/erts/emulator/beam/dist.h b/erts/emulator/beam/dist.h
index e82b416286..8799e54057 100644
--- a/erts/emulator/beam/dist.h
+++ b/erts/emulator/beam/dist.h
@@ -375,7 +375,7 @@ extern int erts_dsig_send_monitor(ErtsDSigData *, Eterm, Eterm, Eterm);
extern int erts_dsig_send_m_exit(ErtsDSigData *, Eterm, Eterm, Eterm, Eterm);
extern int erts_dsig_send(ErtsDSigData *dsdp, struct erts_dsig_send_context* ctx);
-extern void erts_dsend_context_dtor(Binary*);
+extern int erts_dsend_context_dtor(Binary*);
extern Eterm erts_dsend_export_trap_context(Process* p, ErtsSendContext* ctx);
extern int erts_dist_command(Port *prt, int reds);
diff --git a/erts/emulator/beam/erl_bif_binary.c b/erts/emulator/beam/erl_bif_binary.c
index e57cd06cec..deab371e3e 100644
--- a/erts/emulator/beam/erl_bif_binary.c
+++ b/erts/emulator/beam/erl_bif_binary.c
@@ -239,13 +239,13 @@ static void dump_ac_node(ACNode *node, int indent, int ch);
/*
* Callback for the magic binary
*/
-static void cleanup_my_data_ac(Binary *bp)
+static int cleanup_my_data_ac(Binary *bp)
{
- return;
+ return 1;
}
-static void cleanup_my_data_bm(Binary *bp)
+static int cleanup_my_data_bm(Binary *bp)
{
- return;
+ return 1;
}
/*
@@ -2067,7 +2067,7 @@ static int do_search_backward(CommonData *cd, Uint *posp, Uint *redsp)
}
}
-static void cleanup_common_data(Binary *bp)
+static int cleanup_common_data(Binary *bp)
{
int i;
CommonData *cd;
@@ -2084,7 +2084,7 @@ static void cleanup_common_data(Binary *bp)
break;
}
}
- return;
+ return 1;
}
static BIF_RETTYPE do_longest_common(Process *p, Eterm list, int direction)
@@ -2563,7 +2563,7 @@ typedef struct {
#define BINARY_COPY_LOOP_FACTOR 100
-static void cleanup_copy_bin_state(Binary *bp)
+static int cleanup_copy_bin_state(Binary *bp)
{
CopyBinState *cbs = (CopyBinState *) ERTS_MAGIC_BIN_DATA(bp);
if (cbs->result != NULL) {
@@ -2583,6 +2583,7 @@ static void cleanup_copy_bin_state(Binary *bp)
break;
}
cbs->source_type = BC_TYPE_EMPTY;
+ return 1;
}
/*
diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index be113b7c88..5a8776076e 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -3567,9 +3567,9 @@ BIF_RETTYPE error_logger_warning_map_0(BIF_ALIST_0)
static erts_smp_atomic_t available_internal_state;
-static void empty_magic_ref_destructor(Binary *bin)
+static int empty_magic_ref_destructor(Binary *bin)
{
-
+ return 1;
}
BIF_RETTYPE erts_debug_get_internal_state_1(BIF_ALIST_1)
diff --git a/erts/emulator/beam/erl_bif_re.c b/erts/emulator/beam/erl_bif_re.c
index ba183f24e8..a66b05c6ff 100644
--- a/erts/emulator/beam/erl_bif_re.c
+++ b/erts/emulator/beam/erl_bif_re.c
@@ -600,10 +600,11 @@ static void cleanup_restart_context(RestartContext *rc)
}
}
-static void cleanup_restart_context_bin(Binary *bp)
+static int cleanup_restart_context_bin(Binary *bp)
{
RestartContext *rc = ERTS_MAGIC_BIN_DATA(bp);
cleanup_restart_context(rc);
+ return 1;
}
/*
diff --git a/erts/emulator/beam/erl_binary.h b/erts/emulator/beam/erl_binary.h
index 4d9c4d6eac..db259be2a7 100644
--- a/erts/emulator/beam/erl_binary.h
+++ b/erts/emulator/beam/erl_binary.h
@@ -65,7 +65,7 @@ typedef struct magic_binary ErtsMagicBinary;
struct magic_binary {
ERTS_INTERNAL_BINARY_FIELDS
SWord orig_size;
- void (*destructor)(Binary *);
+ int (*destructor)(Binary *);
Uint32 refn[ERTS_REF_NUMBERS];
ErtsAlcType_t alloc_type;
union {
@@ -335,12 +335,12 @@ ERTS_GLB_INLINE Binary *erts_bin_realloc_fnf(Binary *bp, Uint size);
ERTS_GLB_INLINE Binary *erts_bin_realloc(Binary *bp, Uint size);
ERTS_GLB_INLINE void erts_bin_free(Binary *bp);
ERTS_GLB_INLINE Binary *erts_create_magic_binary_x(Uint size,
- void (*destructor)(Binary *),
+ int (*destructor)(Binary *),
ErtsAlcType_t alloc_type,
int unaligned);
ERTS_GLB_INLINE Binary *erts_create_magic_binary(Uint size,
- void (*destructor)(Binary *));
-ERTS_GLB_INLINE Binary *erts_create_magic_indirection(void (*destructor)(Binary *));
+ int (*destructor)(Binary *));
+ERTS_GLB_INLINE Binary *erts_create_magic_indirection(int (*destructor)(Binary *));
ERTS_GLB_INLINE erts_smp_atomic_t *erts_smp_binary_to_magic_indirection(Binary *bp);
ERTS_GLB_INLINE erts_atomic_t *erts_binary_to_magic_indirection(Binary *bp);
@@ -471,7 +471,10 @@ ERTS_GLB_INLINE void
erts_bin_free(Binary *bp)
{
if (bp->flags & BIN_FLAG_MAGIC) {
- ERTS_MAGIC_BIN_DESTRUCTOR(bp)(bp);
+ if (!ERTS_MAGIC_BIN_DESTRUCTOR(bp)(bp)) {
+ /* Destructor took control of the deallocation */
+ return;
+ }
erts_magic_ref_remove_bin(ERTS_MAGIC_BIN_REFN(bp));
erts_free(ERTS_MAGIC_BIN_ATYPE(bp), (void *) bp);
}
@@ -482,7 +485,7 @@ erts_bin_free(Binary *bp)
}
ERTS_GLB_INLINE Binary *
-erts_create_magic_binary_x(Uint size, void (*destructor)(Binary *),
+erts_create_magic_binary_x(Uint size, int (*destructor)(Binary *),
ErtsAlcType_t alloc_type,
int unaligned)
{
@@ -504,14 +507,14 @@ erts_create_magic_binary_x(Uint size, void (*destructor)(Binary *),
}
ERTS_GLB_INLINE Binary *
-erts_create_magic_binary(Uint size, void (*destructor)(Binary *))
+erts_create_magic_binary(Uint size, int (*destructor)(Binary *))
{
return erts_create_magic_binary_x(size, destructor,
ERTS_ALC_T_BINARY, 0);
}
ERTS_GLB_INLINE Binary *
-erts_create_magic_indirection(void (*destructor)(Binary *))
+erts_create_magic_indirection(int (*destructor)(Binary *))
{
return erts_create_magic_binary_x(sizeof(ErtsMagicIndirectionWord),
destructor,
diff --git a/erts/emulator/beam/erl_db_util.c b/erts/emulator/beam/erl_db_util.c
index 070e29578f..3ac2bdd3d6 100644
--- a/erts/emulator/beam/erl_db_util.c
+++ b/erts/emulator/beam/erl_db_util.c
@@ -1702,17 +1702,18 @@ error: /* Here is were we land when compilation failed. */
/*
** Free a match program (in a binary)
*/
-void erts_db_match_prog_destructor(Binary *bprog)
+int erts_db_match_prog_destructor(Binary *bprog)
{
MatchProg *prog;
if (bprog == NULL)
- return;
+ return 1;
prog = Binary2MatchProg(bprog);
if (prog->term_save != NULL) {
free_message_buffer(prog->term_save);
}
if (prog->saved_program_buf != NULL)
free_message_buffer(prog->saved_program_buf);
+ return 1;
}
void
diff --git a/erts/emulator/beam/erl_db_util.h b/erts/emulator/beam/erl_db_util.h
index b2a3bb6c20..471fefe3cb 100644
--- a/erts/emulator/beam/erl_db_util.h
+++ b/erts/emulator/beam/erl_db_util.h
@@ -356,7 +356,7 @@ Eterm db_add_counter(Eterm** hpp, Wterm counter, Eterm incr);
Eterm db_match_set_lint(Process *p, Eterm matchexpr, Uint flags);
Binary *db_match_set_compile(Process *p, Eterm matchexpr,
Uint flags);
-void erts_db_match_prog_destructor(Binary *);
+int erts_db_match_prog_destructor(Binary *);
typedef struct match_prog {
ErlHeapFragment *term_save; /* Only if needed, a list of message
diff --git a/erts/emulator/beam/erl_map.c b/erts/emulator/beam/erl_map.c
index 990be8efb2..9062e44b10 100644
--- a/erts/emulator/beam/erl_map.c
+++ b/erts/emulator/beam/erl_map.c
@@ -1188,12 +1188,13 @@ typedef struct HashmapMergeContext_ {
#endif
} HashmapMergeContext;
-static void hashmap_merge_ctx_destructor(Binary* ctx_bin)
+static int hashmap_merge_ctx_destructor(Binary* ctx_bin)
{
HashmapMergeContext* ctx = (HashmapMergeContext*) ERTS_MAGIC_BIN_DATA(ctx_bin);
ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(ctx_bin) == hashmap_merge_ctx_destructor);
PSTACK_DESTROY_SAVED(&ctx->pstack);
+ return 1;
}
BIF_RETTYPE maps_merge_trap_1(BIF_ALIST_1) {
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index 3674a29bf8..61ae57a7f0 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -2140,7 +2140,7 @@ static void rollback_opened_resource_types(void)
}
-static void nif_resource_dtor(Binary* bin)
+static int nif_resource_dtor(Binary* bin)
{
ErlNifResource* resource = (ErlNifResource*) ERTS_MAGIC_BIN_UNALIGNED_DATA(bin);
ErlNifResourceType* type = resource->type;
@@ -2159,6 +2159,7 @@ static void nif_resource_dtor(Binary* bin)
steal_resource_type(type);
erts_free(ERTS_ALC_T_NIF, type);
}
+ return 1;
}
void* enif_alloc_resource(ErlNifResourceType* type, size_t size)
diff --git a/erts/emulator/beam/erl_ptab.c b/erts/emulator/beam/erl_ptab.c
index a132b1d334..ce28708ece 100644
--- a/erts/emulator/beam/erl_ptab.c
+++ b/erts/emulator/beam/erl_ptab.c
@@ -733,7 +733,7 @@ erts_ptab_delete_element(ErtsPTab *ptab,
* erts_ptab_list() implements BIFs listing the content of the table,
* e.g. erlang:processes/0.
*/
-static void cleanup_ptab_list_bif_data(Binary *bp);
+static int cleanup_ptab_list_bif_data(Binary *bp);
static int ptab_list_bif_engine(Process *c_p, Eterm *res_accp, Binary *mbp);
@@ -787,7 +787,7 @@ erts_ptab_list(Process *c_p, ErtsPTab *ptab)
return ret_val;
}
-static void
+static int
cleanup_ptab_list_bif_data(Binary *bp)
{
ErtsPTabListBifData *ptlbdp = ERTS_MAGIC_BIN_DATA(bp);
@@ -875,6 +875,8 @@ cleanup_ptab_list_bif_data(Binary *bp)
ERTS_PTAB_LIST_DBG_TRACE(ptlbdp->debug.caller, return);
ERTS_PTAB_LIST_DBG_CLEANUP(ptlbdp);
+
+ return 1;
}
static int
diff --git a/erts/emulator/beam/erl_unicode.c b/erts/emulator/beam/erl_unicode.c
index dd7c589c3d..01629db9ad 100644
--- a/erts/emulator/beam/erl_unicode.c
+++ b/erts/emulator/beam/erl_unicode.c
@@ -123,10 +123,11 @@ static void cleanup_restart_context(RestartContext *rc)
}
}
-static void cleanup_restart_context_bin(Binary *bp)
+static int cleanup_restart_context_bin(Binary *bp)
{
RestartContext *rc = ERTS_MAGIC_BIN_DATA(bp);
cleanup_restart_context(rc);
+ return 1;
}
static RestartContext *get_rc_from_bin(Eterm mref)
diff --git a/erts/emulator/beam/external.c b/erts/emulator/beam/external.c
index f9cba0aec0..205a7711ec 100644
--- a/erts/emulator/beam/external.c
+++ b/erts/emulator/beam/external.c
@@ -1398,12 +1398,13 @@ static void b2t_destroy_context(B2TContext* context)
}
}
-static void b2t_context_destructor(Binary *context_bin)
+static int b2t_context_destructor(Binary *context_bin)
{
B2TContext* ctx = (B2TContext*) ERTS_MAGIC_BIN_DATA(context_bin);
ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(context_bin) == b2t_context_destructor);
b2t_destroy_context(ctx);
+ return 1;
}
static BIF_RETTYPE binary_to_term_trap_1(BIF_ALIST_1)
@@ -1808,7 +1809,7 @@ erts_term_to_binary(Process* p, Eterm Term, int level, Uint flags) {
#endif
#define TERM_TO_BINARY_MEMCPY_FACTOR 8
-static void ttb_context_destructor(Binary *context_bin)
+static int ttb_context_destructor(Binary *context_bin)
{
TTBContext *context = ERTS_MAGIC_BIN_DATA(context_bin);
if (context->alive) {
@@ -1842,6 +1843,7 @@ static void ttb_context_destructor(Binary *context_bin)
break;
}
}
+ return 1;
}
static Eterm erts_term_to_binary_int(Process* p, Eterm Term, int level, Uint flags,
diff --git a/erts/emulator/hipe/hipe_load.c b/erts/emulator/hipe/hipe_load.c
index 2998ed87a2..87c5004d2b 100644
--- a/erts/emulator/hipe/hipe_load.c
+++ b/erts/emulator/hipe/hipe_load.c
@@ -61,7 +61,7 @@ void hipe_free_loader_state(HipeLoaderState *stp)
stp->module = NIL;
}
-static void
+static int
hipe_loader_state_dtor(Binary* magic)
{
HipeLoaderState* stp = ERTS_MAGIC_BIN_DATA(magic);
@@ -69,6 +69,7 @@ hipe_loader_state_dtor(Binary* magic)
ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(magic) == hipe_loader_state_dtor);
hipe_free_loader_state(stp);
+ return 1;
}
Binary *hipe_alloc_loader_state(Eterm module)