Protect the access to lt_op_map by a mutex

[perl/modules/Lexical-Types.git] / Types.xs

diff --git a/Types.xs b/Types.xs
index 2e8bda47037bcbf9f595dc9f0ae72325831138ea..0b5b3f5fd1c97f2581f7f2c775bf00d836e2b547 100644 (file)
--- a/Types.xs
+++ b/Types.xs
@@ -6,6 +6,9 @@
 #include "perl.h"
 #include "XSUB.h"
 
+#define __PACKAGE__     "Lexical::Types"
+#define __PACKAGE_LEN__ (sizeof(__PACKAGE__)-1)
+
 /* --- Compatibility wrappers ---------------------------------------------- */
 
 #define LT_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
@@ -32,9 +35,6 @@
 # define HvNAMELEN_get(H) strlen(HvNAME_get(H))
 #endif
 
-#define __PACKAGE__     "Lexical::Types"
-#define __PACKAGE_LEN__ (sizeof(__PACKAGE__)-1)
-
 /* --- Helpers ------------------------------------------------------------- */
 
 /* ... Hints ............................................................... */
@@ -61,10 +61,15 @@ STATIC SV *lt_hint(pTHX) {
 
 /* ... op => info map ...................................................... */
 
-#define OP2STR_BUF char buf[(CHAR_BIT * sizeof(UV)) / 2]
-#define OP2STR(O)  (sprintf(buf, "%"UVxf, PTR2UV(O)))
+#define PTABLE_VAL_FREE(V) PerlMemShared_free(V)
+
+#include "ptable.h"
 
-STATIC HV *lt_op_map = NULL;
+STATIC ptable *lt_op_map = NULL;
+
+#ifdef USE_ITHREADS
+STATIC perl_mutex lt_op_map_mutex;
+#endif
 
 typedef struct {
  SV *orig_pkg;
@@ -73,42 +78,56 @@ typedef struct {
  OP *(*pp_padsv)(pTHX);
 } lt_op_info;
 
-STATIC void lt_map_store(pTHX_ const OP *o, SV *orig_pkg, SV *type_pkg, SV *type_meth, OP *(*pp_padsv)(pTHX)) {
-#define lt_map_store(O, P1, P2, M, PP) lt_map_store(aTHX_ (O), (P1), (P2), (M), (PP))
- OP2STR_BUF;
- SV *val;
+STATIC void lt_map_store(const OP *o, SV *orig_pkg, SV *type_pkg, SV *type_meth, OP *(*pp_padsv)(pTHX)) {
  lt_op_info *oi;
 
- Newx(oi, 1, lt_op_info);
+#ifdef USE_ITHREADS
+ MUTEX_LOCK(&lt_op_map_mutex);
+#endif
+
+ if (!(oi = ptable_fetch(lt_op_map, o))) {
+  oi = PerlMemShared_malloc(sizeof *oi);
+  ptable_store(lt_op_map, o, oi);
+ }
+
  oi->orig_pkg  = orig_pkg;
  oi->type_pkg  = type_pkg;
  oi->type_meth = type_meth;
  oi->pp_padsv  = pp_padsv;
- val = newSVuv(PTR2UV(oi));
 
- (void)hv_store(lt_op_map, buf, OP2STR(o), val, 0);
+#ifdef USE_ITHREADS
+ MUTEX_UNLOCK(&lt_op_map_mutex);
+#endif
 }
 
-STATIC const lt_op_info *lt_map_fetch(pTHX_ const OP *o) {
-#define lt_map_fetch(O) lt_map_fetch(aTHX_ (O))
- OP2STR_BUF;
- SV **svp;
+STATIC const lt_op_info *lt_map_fetch(const OP *o, lt_op_info *oi) {
+ const lt_op_info *val;
 
- svp = hv_fetch(lt_op_map, buf, OP2STR(o), 0);
+#ifdef USE_ITHREADS
+ MUTEX_LOCK(&lt_op_map_mutex);
+#endif
+
+ val = ptable_fetch(lt_op_map, o);
+ if (val) {
+  *oi = *val;
+  val = oi;
+ }
 
- return svp ? INT2PTR(const lt_op_info *, SvUVX(*svp)) : NULL;
+#ifdef USE_ITHREADS
+ MUTEX_UNLOCK(&lt_op_map_mutex);
+#endif
+
+ return val;
 }
 
 /* --- Hooks --------------------------------------------------------------- */
 
 /* ... Our pp_padsv ........................................................ */
 
-STATIC OP *(*lt_old_pp_padsv)(pTHX) = 0;
-
 STATIC OP *lt_pp_padsv(pTHX) {
- const lt_op_info *oi;
+ lt_op_info oi;
 
- if ((PL_op->op_private & OPpLVAL_INTRO) && (oi = lt_map_fetch(PL_op))) {
+ if ((PL_op->op_private & OPpLVAL_INTRO) && lt_map_fetch(PL_op, &oi)) {
   PADOFFSET targ = PL_op->op_targ;
   SV *sv         = PAD_SVl(targ);
 
@@ -121,12 +140,12 @@ STATIC OP *lt_pp_padsv(pTHX) {
 
    PUSHMARK(SP);
    EXTEND(SP, 3);
-   PUSHs(oi->type_pkg);
+   PUSHs(oi.type_pkg);
    PUSHs(sv);
-   PUSHs(oi->orig_pkg);
+   PUSHs(oi.orig_pkg);
    PUTBACK;
 
-   items = call_sv(oi->type_meth, G_ARRAY | G_METHOD);
+   items = call_sv(oi.type_meth, G_ARRAY | G_METHOD);
 
    SPAGAIN;
    switch (items) {
@@ -144,10 +163,31 @@ STATIC OP *lt_pp_padsv(pTHX) {
    LEAVE;
   }
 
-  return CALL_FPTR(oi->pp_padsv)(aTHX);
+  return CALL_FPTR(oi.pp_padsv)(aTHX);
  }
 
- return CALL_FPTR(lt_old_pp_padsv)(aTHX);
+ return CALL_FPTR(PL_ppaddr[OP_PADSV])(aTHX);
+}
+
+STATIC OP *(*lt_pp_padsv_saved)(pTHX) = 0;
+
+STATIC void lt_pp_padsv_save(void) {
+ if (lt_pp_padsv_saved)
+  return;
+
+ lt_pp_padsv_saved   = PL_ppaddr[OP_PADSV];
+ PL_ppaddr[OP_PADSV] = lt_pp_padsv;
+}
+
+STATIC void lt_pp_padsv_restore(OP *o) {
+ if (!lt_pp_padsv_saved)
+  return;
+
+ if (o->op_ppaddr == lt_pp_padsv)
+  o->op_ppaddr = lt_pp_padsv_saved;
+
+ PL_ppaddr[OP_PADSV] = lt_pp_padsv_saved;
+ lt_pp_padsv_saved   = 0;
 }
 
 /* ... Our ck_pad{any,sv} .................................................. */
@@ -168,7 +208,7 @@ STATIC OP *lt_ck_padany(pTHX_ OP *o) {
  HV *stash;
  SV *hint;
 
- PL_ppaddr[OP_PADSV] = lt_old_pp_padsv;
+ lt_pp_padsv_restore(o);
 
  o = CALL_FPTR(lt_old_ck_padany)(aTHX_ o);
 
@@ -176,8 +216,8 @@ STATIC OP *lt_ck_padany(pTHX_ OP *o) {
  if (stash && (hint = lt_hint())) {
   SV *orig_pkg  = newSVpvn(HvNAME_get(stash), HvNAMELEN_get(stash));
   SV *orig_meth = lt_default_meth;
-  SV *type_pkg  = orig_pkg;
-  SV *type_meth = orig_meth;
+  SV *type_pkg  = NULL;
+  SV *type_meth = NULL;
   SV *code      = INT2PTR(SV *, SvUVX(hint));
 
   SvREADONLY_on(orig_pkg);
@@ -202,7 +242,6 @@ STATIC OP *lt_ck_padany(pTHX_ OP *o) {
     croak(__PACKAGE__ " mangler should return zero, one or two scalars, but got %d", items);
    if (items == 0) {
     SvREFCNT_dec(orig_pkg);
-    SvREFCNT_dec(orig_meth);
     goto skip;
    } else {
     SV *rsv;
@@ -225,12 +264,19 @@ STATIC OP *lt_ck_padany(pTHX_ OP *o) {
    LEAVE;
   }
 
-  if (type_meth == orig_meth)
+  if (!type_pkg) {
+   type_pkg = orig_pkg;
+   SvREFCNT_inc(orig_pkg);
+  }
+
+  if (!type_meth) {
+   type_meth = orig_meth;
    SvREFCNT_inc(orig_meth);
-  lt_map_store(o, orig_pkg, type_pkg, type_meth, lt_old_pp_padsv);
+  }
 
-  lt_old_pp_padsv     = PL_ppaddr[OP_PADSV];
-  PL_ppaddr[OP_PADSV] = lt_pp_padsv;
+  lt_pp_padsv_save();
+
+  lt_map_store(o, orig_pkg, type_pkg, type_meth, lt_pp_padsv_saved);
  }
 
 skip:
@@ -240,7 +286,8 @@ skip:
 STATIC OP *(*lt_old_ck_padsv)(pTHX_ OP *) = 0;
 
 STATIC OP *lt_ck_padsv(pTHX_ OP *o) {
- PL_ppaddr[OP_PADSV] = lt_old_pp_padsv;
+ lt_pp_padsv_restore(o);
+
  return CALL_FPTR(lt_old_ck_padsv)(aTHX_ o);
 }
 
@@ -255,17 +302,20 @@ PROTOTYPES: DISABLE
 BOOT: 
 {                                    
  if (!lt_initialized++) {
+  lt_op_map = ptable_new();
+#ifdef USE_ITHREADS
+  MUTEX_INIT(&lt_op_map_mutex);
+#endif
+
   lt_default_meth = newSVpvn("TYPEDSCALAR", 11);
   SvREADONLY_on(lt_default_meth);
 
   PERL_HASH(lt_hash, __PACKAGE__, __PACKAGE_LEN__);
-  lt_op_map = newHV();
 
   lt_old_ck_padany    = PL_check[OP_PADANY];
   PL_check[OP_PADANY] = MEMBER_TO_FPTR(lt_ck_padany);
   lt_old_ck_padsv     = PL_check[OP_PADSV];
   PL_check[OP_PADSV]  = MEMBER_TO_FPTR(lt_ck_padsv);
-  lt_old_pp_padsv     = PL_ppaddr[OP_PADSV];
  }
 }