From: Vincent Pit <vince@profvince.com>
Date: Tue, 30 Jun 2009 22:14:56 +0000 (+0200)
Subject: Work around the hints propagation in requires on perl <= 5.10.0
X-Git-Tag: v0.07~2
X-Git-Url: http://git.vpit.fr/?p=perl%2Fmodules%2FLexical-Types.git;a=commitdiff_plain;h=28f52395e07f990ec77ca6b87352811f2a9c5f79

Work around the hints propagation in requires on perl <= 5.10.0
---

diff --git a/MANIFEST b/MANIFEST
index 89831d7..f14794d 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -14,6 +14,7 @@ t/12-integrate.t
 t/13-padsv.t
 t/14-ro.t
 t/15-constants.t
+t/16-scope.t
 t/20-object.t
 t/21-tie.t
 t/22-magic.t
@@ -23,3 +24,5 @@ t/91-pod.t
 t/92-pod-coverage.t
 t/95-portability-files.t
 t/99-kwalitee.t
+t/lib/Lexical/Types/TestRequired1.pm
+t/lib/Lexical/Types/TestRequired2.pm
diff --git a/Types.xs b/Types.xs
index bcf5fa1..221319f 100644
--- a/Types.xs
+++ b/Types.xs
@@ -23,6 +23,10 @@
 # endif
 #endif
 
+#ifndef LT_WORKAROUND_REQUIRE_PROPAGATION
+# define LT_WORKAROUND_REQUIRE_PROPAGATION !LT_HAS_PERL(5, 10, 1)
+#endif
+
 #ifndef HvNAME_get
 # define HvNAME_get(H) HvNAME(H)
 #endif
@@ -59,16 +63,35 @@
 # endif
 #else
 # define LT_THREADSAFE 0
+# undef  dMY_CXT
+# define dMY_CXT      dNOOP
+# undef  MY_CXT
+# define MY_CXT       lt_globaldata
+# undef  START_MY_CXT
+# define START_MY_CXT STATIC my_cxt_t MY_CXT;
+# undef  MY_CXT_INIT
+# define MY_CXT_INIT  NOOP
+# undef  MY_CXT_CLONE
+# define MY_CXT_CLONE NOOP
 #endif
 
 /* --- Helpers ------------------------------------------------------------- */
 
 /* ... Thread-safe hints ................................................... */
 
-#if LT_THREADSAFE
+/* If any of those is true, we need to store the hint in a global table. */
+
+#if LT_THREADSAFE || LT_WORKAROUND_REQUIRE_PROPAGATION
+
+typedef struct {
+ SV *code;
+#if LT_WORKAROUND_REQUIRE_PROPAGATION
+ UV  requires;
+#endif
+} lt_hint_t;
 
 #define PTABLE_NAME        ptable_hints
-#define PTABLE_VAL_FREE(V) if ((V) && !SvIS_FREED((SV *) (V))) SvREFCNT_dec(V)
+#define PTABLE_VAL_FREE(V) { lt_hint_t *h = (V); SvREFCNT_dec(h->code); PerlMemShared_free(h); }
 
 #define pPTBL  pTHX
 #define pPTBL_ pTHX_
@@ -83,31 +106,39 @@
 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
 
 typedef struct {
- ptable *tbl;
+ ptable *tbl; /* It really is a ptable_hints */
+#if LT_THREADSAFE
  tTHX    owner;
+#endif
 } my_cxt_t;
 
 START_MY_CXT
 
+#if LT_THREADSAFE
+
 STATIC void lt_ptable_hints_clone(pTHX_ ptable_ent *ent, void *ud_) {
- my_cxt_t *ud  = ud_;
- SV       *val = ent->val;
+ my_cxt_t  *ud  = ud_;
+ lt_hint_t *h1 = ent->val;
+ lt_hint_t *h2 = PerlMemShared_malloc(sizeof *h2);
+
+ *h2 = *h1;
 
  if (ud->owner != aTHX) {
+  SV *val = h1->code;
   CLONE_PARAMS param;
   AV *stashes = (SvTYPE(val) == SVt_PVHV && HvNAME_get(val)) ? newAV() : NULL;
   param.stashes    = stashes;
   param.flags      = 0;
   param.proto_perl = ud->owner;
-  val = sv_dup(val, &param);
+  h2->code = sv_dup(val, &param);
   if (stashes) {
    av_undef(stashes);
    SvREFCNT_dec(stashes);
   }
  }
 
- ptable_hints_store(ud->tbl, ent->key, val);
- SvREFCNT_inc(val);
+ ptable_hints_store(ud->tbl, ent->key, h2);
+ SvREFCNT_inc(h2->code);
 }
 
 STATIC void lt_thread_cleanup(pTHX_ void *);
@@ -127,35 +158,76 @@ STATIC void lt_thread_cleanup(pTHX_ void *ud) {
  }
 }
 
+#endif /* LT_THREADSAFE */
+
 STATIC SV *lt_tag(pTHX_ SV *value) {
 #define lt_tag(V) lt_tag(aTHX_ (V))
+ lt_hint_t *h;
  dMY_CXT;
 
  value = SvOK(value) && SvROK(value) ? SvRV(value) : NULL;
+
+ h = PerlMemShared_malloc(sizeof *h);
+ h->code = SvREFCNT_inc(value);
+
+#if LT_WORKAROUND_REQUIRE_PROPAGATION
+ {
+  const PERL_SI *si;
+  UV             requires = 0;
+
+  for (si = PL_curstackinfo; si; si = si->si_prev) {
+   I32 cxix;
+
+   for (cxix = si->si_cxix; cxix >= 0; --cxix) {
+    const PERL_CONTEXT *cx = si->si_cxstack + cxix;
+
+    if (CxTYPE(cx) == CXt_EVAL && cx->blk_eval.old_op_type == OP_REQUIRE)
+     ++requires;
+   }
+  }
+
+  h->requires = requires;
+ }
+#endif
+
  /* We only need for the key to be an unique tag for looking up the value later.
   * Allocated memory provides convenient unique identifiers, so that's why we
   * use the value pointer as the key itself. */
- ptable_hints_store(MY_CXT.tbl, value, value);
- SvREFCNT_inc(value);
+ ptable_hints_store(MY_CXT.tbl, value, h);
 
  return newSVuv(PTR2UV(value));
 }
 
 STATIC SV *lt_detag(pTHX_ const SV *hint) {
 #define lt_detag(H) lt_detag(aTHX_ (H))
- void *tag;
- SV   *value;
+ lt_hint_t *h;
+ dMY_CXT;
+
+ if (!(hint && SvOK(hint) && SvIOK(hint)))
+  return NULL;
 
- if (!hint || !SvOK(hint) || !SvIOK(hint))
-  croak("Wrong hint");
+ h = ptable_fetch(MY_CXT.tbl, INT2PTR(void *, SvUVX(hint)));
 
- tag = INT2PTR(void *, SvIVX(hint));
+#if LT_WORKAROUND_REQUIRE_PROPAGATION
  {
-  dMY_CXT;
-  value = ptable_fetch(MY_CXT.tbl, tag);
+  const PERL_SI *si;
+  UV             requires = 0;
+
+  for (si = PL_curstackinfo; si; si = si->si_prev) {
+   I32 cxix;
+
+   for (cxix = si->si_cxix; cxix >= 0; --cxix) {
+    const PERL_CONTEXT *cx = si->si_cxstack + cxix;
+
+    if (CxTYPE(cx) == CXt_EVAL && cx->blk_eval.old_op_type == OP_REQUIRE
+                               && ++requires > h->requires)
+     return NULL;
+   }
+  }
  }
+#endif
 
- return value;
+ return h->code;
 }
 
 #else
@@ -173,9 +245,9 @@ STATIC SV *lt_tag(pTHX_ SV *value) {
  return newSVuv(tag);
 }
 
-#define lt_detag(H) INT2PTR(SV *, SvUVX(H))
+#define lt_detag(H) (((H) && SvOK(H)) ? INT2PTR(SV *, SvUVX(H)) : NULL)
 
-#endif /* LT_THREADSAFE */
+#endif /* LT_THREADSAFE || LT_WORKAROUND_REQUIRE_PROPAGATION */
 
 STATIC U32 lt_hash = 0;
 
@@ -194,7 +266,7 @@ STATIC SV *lt_hint(pTHX) {
   return 0;
  hint = *val;
 #endif
- return (hint && SvOK(hint)) ? hint : NULL;
+ return lt_detag(hint);
 }
 
 /* ... op => info map ...................................................... */
@@ -362,63 +434,60 @@ STATIC OP *(*lt_old_ck_padany)(pTHX_ OP *) = 0;
 
 STATIC OP *lt_ck_padany(pTHX_ OP *o) {
  HV *stash;
- SV *hint;
+ SV *code;
 
  lt_pp_padsv_restore(o);
 
  o = CALL_FPTR(lt_old_ck_padany)(aTHX_ o);
 
  stash = PL_in_my_stash;
- if (stash && (hint = lt_hint())) {
+ if (stash && (code = lt_hint())) {
   SV *orig_pkg  = newSVpvn(HvNAME_get(stash), HvNAMELEN_get(stash));
   SV *orig_meth = lt_default_meth;
   SV *type_pkg  = NULL;
   SV *type_meth = NULL;
-  SV *code      = lt_detag(hint);
-
-  SvREADONLY_on(orig_pkg);
+  int items;
 
-  if (code) {
-   int items;
-   dSP;
-
-   ENTER;
-   SAVETMPS;
-
-   PUSHMARK(SP);
-   EXTEND(SP, 2);
-   PUSHs(orig_pkg);
-   PUSHs(orig_meth);
-   PUTBACK;
+  dSP;
 
-   items = call_sv(code, G_ARRAY);
+  SvREADONLY_on(orig_pkg);
 
-   SPAGAIN;
-   if (items > 2)
-    croak(__PACKAGE__ " mangler should return zero, one or two scalars, but got %d", items);
-   if (items == 0) {
-    SvREFCNT_dec(orig_pkg);
-    goto skip;
-   } else {
-    SV *rsv;
-    if (items > 1) {
-     rsv = POPs;
-     if (SvOK(rsv)) {
-      type_meth = newSVsv(rsv);
-      SvREADONLY_on(type_meth);
-     }
-    }
+  ENTER;
+  SAVETMPS;
+
+  PUSHMARK(SP);
+  EXTEND(SP, 2);
+  PUSHs(orig_pkg);
+  PUSHs(orig_meth);
+  PUTBACK;
+
+  items = call_sv(code, G_ARRAY);
+
+  SPAGAIN;
+  if (items > 2)
+   croak(__PACKAGE__ " mangler should return zero, one or two scalars, but got %d", items);
+  if (items == 0) {
+   SvREFCNT_dec(orig_pkg);
+   goto skip;
+  } else {
+   SV *rsv;
+   if (items > 1) {
     rsv = POPs;
     if (SvOK(rsv)) {
-     type_pkg = newSVsv(rsv);
-     SvREADONLY_on(type_pkg);
+     type_meth = newSVsv(rsv);
+     SvREADONLY_on(type_meth);
     }
    }
-   PUTBACK;
-
-   FREETMPS;
-   LEAVE;
+   rsv = POPs;
+   if (SvOK(rsv)) {
+    type_pkg = newSVsv(rsv);
+    SvREADONLY_on(type_pkg);
+   }
   }
+  PUTBACK;
+
+  FREETMPS;
+  LEAVE;
 
   if (!type_pkg) {
    type_pkg = orig_pkg;
@@ -463,9 +532,11 @@ BOOT:
 {                                    
  if (!lt_initialized++) {
   HV *stash;
-#if LT_THREADSAFE
+#if LT_THREADSAFE || LT_WORKAROUND_REQUIRE_PROPAGATION
   MY_CXT_INIT;
   MY_CXT.tbl   = ptable_new();
+#endif
+#if LT_THREADSAFE
   MY_CXT.owner = aTHX;
 #endif
 
diff --git a/lib/Lexical/Types.pm b/lib/Lexical/Types.pm
index e2cc200..14f2699 100644
--- a/lib/Lexical/Types.pm
+++ b/lib/Lexical/Types.pm
@@ -155,7 +155,7 @@ sub import {
    croak "Invalid $r reference for 'as'";
   }
  } else {
-  $hint = _tag(0);
+  $hint = _tag(sub { @_ });
  }
 
  $^H |= 0x020000;
diff --git a/t/16-scope.t b/t/16-scope.t
new file mode 100644
index 0000000..712bec2
--- /dev/null
+++ b/t/16-scope.t
@@ -0,0 +1,22 @@
+#!perl -T
+
+use strict;
+use warnings;
+
+use Test::More tests => (1 + 2) + (1 + 4);
+
+sub Int::TYPEDSCALAR { join ':', (caller 0)[1, 2] }
+
+our ($x, $y, $z, $t);
+
+use lib 't/lib';
+
+{
+ eval 'use Lexical::Types; use Lexical::Types::TestRequired1';
+ is $@, '', 'first require test didn\'t croak prematurely';
+}
+
+{
+ eval 'use Lexical::Types; use Lexical::Types::TestRequired2';
+ is $@, '', 'second require test didn\'t croak prematurely';
+}
diff --git a/t/lib/Lexical/Types/TestRequired1.pm b/t/lib/Lexical/Types/TestRequired1.pm
new file mode 100644
index 0000000..a54e325
--- /dev/null
+++ b/t/lib/Lexical/Types/TestRequired1.pm
@@ -0,0 +1,11 @@
+package Lexical::Types::TestRequired1;
+
+my Int $x;
+Test::More::is($x, undef, 'pragma not in use in require');
+
+eval q{
+ my Int $y;
+ Test::More::is($y, undef, 'pragma not in use in eval in require');
+};
+
+1;
diff --git a/t/lib/Lexical/Types/TestRequired2.pm b/t/lib/Lexical/Types/TestRequired2.pm
new file mode 100644
index 0000000..eb15065
--- /dev/null
+++ b/t/lib/Lexical/Types/TestRequired2.pm
@@ -0,0 +1,25 @@
+package Lexical::Types::TestRequired2;
+
+use Lexical::Types;
+
+BEGIN {
+ delete $INC{'Lexical/Types/TestRequired1.pm'};
+}
+
+use lib 't/lib';
+use Lexical::Types::TestRequired1;
+
+my Int $x;
+Test::More::is($x, 't/lib/Lexical/Types/TestRequired2.pm:' . (__LINE__-1), 'pragma in use in require');
+
+eval q!
+ my Int $y;
+ my $desc = 'pragma in use in eval in require';
+ if ($] <  5.009005) {
+  Test::More::is($y, undef, $desc);
+ } else {
+  Test::More::like($y, qr/^\(eval +\d+\):2$/, $desc);
+ }
+!;
+
+1;