Moose-2.1405HEADMoose-2.1405master

1 files changed, 286 insertions, 0 deletions

diff --git a/mop.c b/mop.c
new file mode 100644
index 0000000..23ca98a
--- /dev/null
+++ b/mop.c
@@ -0,0 +1,286 @@
+#include "mop.h"
+
+void
+mop_call_xs (pTHX_ XSPROTO(subaddr), CV *cv, SV **mark)
+{
+    dSP;
+    PUSHMARK(mark);
+    (*subaddr)(aTHX_ cv);
+    PUTBACK;
+}
+
+#if PERL_VERSION >= 10
+UV
+mop_check_package_cache_flag (pTHX_ HV *stash)
+{
+    assert(SvTYPE(stash) == SVt_PVHV);
+
+    /* here we're trying to implement a c version of mro::get_pkg_gen($stash),
+     * however the perl core doesn't make it easy for us. It doesn't provide an
+     * api that just does what we want.
+     *
+     * However, we know that the information we want is, inside the core,
+     * available using HvMROMETA(stash)->pkg_gen. Unfortunately, although the
+     * HvMROMETA macro is public, it is implemented using Perl_mro_meta_init,
+     * which is not public and only available inside the core, as the mro
+     * interface as well as the structure returned by mro_meta_init isn't
+     * considered to be stable yet.
+     *
+     * Perl_mro_meta_init isn't declared static, so we could just define it
+     * ourselfs if perls headers don't do that for us, except that won't work
+     * on platforms where symbols need to be explicitly exported when linking
+     * shared libraries.
+     *
+     * So our, hopefully temporary, solution is to be even more evil and
+     * basically reimplement HvMROMETA in a very fragile way that'll blow up
+     * when the relevant parts of the mro implementation in core change.
+     *
+     * :-(
+     *
+     */
+
+    return HvAUX(stash)->xhv_mro_meta
+         ? HvAUX(stash)->xhv_mro_meta->pkg_gen
+         : 0;
+}
+
+#else /* pre 5.10.0 */
+
+UV
+mop_check_package_cache_flag (pTHX_ HV *stash)
+{
+    PERL_UNUSED_ARG(stash);
+    assert(SvTYPE(stash) == SVt_PVHV);
+
+    return PL_sub_generation;
+}
+#endif
+
+SV *
+mop_call0 (pTHX_ SV *const self, SV *const method)
+{
+    dSP;
+    SV *ret;
+
+    PUSHMARK(SP);
+    XPUSHs(self);
+    PUTBACK;
+
+    call_sv(method, G_SCALAR | G_METHOD);
+
+    SPAGAIN;
+    ret = POPs;
+    PUTBACK;
+
+    return ret;
+}
+
+int
+mop_get_code_info (SV *coderef, char **pkg, char **name)
+{
+    if (!SvOK(coderef) || !SvROK(coderef) || SvTYPE(SvRV(coderef)) != SVt_PVCV) {
+        return 0;
+    }
+
+    coderef = SvRV(coderef);
+
+    /* sub is still being compiled */
+    if (!CvGV(coderef)) {
+        return 0;
+    }
+
+    /* I think this only gets triggered with a mangled coderef, but if
+       we hit it without the guard, we segfault. The slightly odd return
+       value strikes me as an improvement (mst)
+    */
+
+    if ( isGV_with_GP(CvGV(coderef)) ) {
+        GV *gv    = CvGV(coderef);
+        HV *stash = GvSTASH(gv) ? GvSTASH(gv) : CvSTASH(coderef);
+
+        *pkg  = stash ? HvNAME(stash) : "__UNKNOWN__";
+        *name = GvNAME( CvGV(coderef) );
+    } else {
+        *pkg  = "__UNKNOWN__";
+        *name = "__ANON__";
+    }
+
+    return 1;
+}
+
+/* XXX: eventually this should just use the implementation in Package::Stash */
+void
+mop_get_package_symbols (HV *stash, type_filter_t filter, get_package_symbols_cb_t cb, void *ud)
+{
+    HE *he;
+
+    (void)hv_iterinit(stash);
+
+    if (filter == TYPE_FILTER_NONE) {
+        while ( (he = hv_iternext(stash)) ) {
+            STRLEN keylen;
+            const char *key = HePV(he, keylen);
+            if (!cb(key, keylen, HeVAL(he), ud)) {
+                return;
+            }
+        }
+        return;
+    }
+
+    while ( (he = hv_iternext(stash)) ) {
+        GV * const gv          = (GV*)HeVAL(he);
+        STRLEN keylen;
+        const char * const key = HePV(he, keylen);
+        SV *sv = NULL;
+
+        if(isGV(gv)){
+            switch (filter) {
+                case TYPE_FILTER_CODE:   sv = (SV *)GvCVu(gv); break;
+                case TYPE_FILTER_ARRAY:  sv = (SV *)GvAV(gv);  break;
+                case TYPE_FILTER_IO:     sv = (SV *)GvIO(gv);  break;
+                case TYPE_FILTER_HASH:   sv = (SV *)GvHV(gv);  break;
+                case TYPE_FILTER_SCALAR: sv = (SV *)GvSV(gv);  break;
+                default:
+                    croak("Unknown type");
+            }
+        }
+        /* expand the gv into a real typeglob if it
+        * contains stub functions or constants and we
+        * were asked to return CODE references */
+        else if (filter == TYPE_FILTER_CODE) {
+            gv_init(gv, stash, key, keylen, GV_ADDMULTI);
+            sv = (SV *)GvCV(gv);
+        }
+
+        if (sv) {
+            if (!cb(key, keylen, sv, ud)) {
+                return;
+            }
+        }
+    }
+}
+
+static bool
+collect_all_symbols (const char *key, STRLEN keylen, SV *val, void *ud)
+{
+    HV *hash = (HV *)ud;
+
+    if (!hv_store (hash, key, keylen, newRV_inc(val), 0)) {
+        croak("failed to store symbol ref");
+    }
+
+    return TRUE;
+}
+
+HV *
+mop_get_all_package_symbols (HV *stash, type_filter_t filter)
+{
+    HV *ret = newHV ();
+    mop_get_package_symbols (stash, filter, collect_all_symbols, ret);
+    return ret;
+}
+
+#define DECLARE_KEY(name)                    { #name, #name, NULL, 0 }
+#define DECLARE_KEY_WITH_VALUE(name, value)  { #name, value, NULL, 0 }
+
+/* the order of these has to match with those in mop.h */
+static struct {
+    const char *name;
+    const char *value;
+    SV *key;
+    U32 hash;
+} prehashed_keys[key_last] = {
+    DECLARE_KEY(_expected_method_class),
+    DECLARE_KEY(ISA),
+    DECLARE_KEY(VERSION),
+    DECLARE_KEY(accessor),
+    DECLARE_KEY(associated_class),
+    DECLARE_KEY(associated_metaclass),
+    DECLARE_KEY(associated_methods),
+    DECLARE_KEY(attribute_metaclass),
+    DECLARE_KEY(attributes),
+    DECLARE_KEY(body),
+    DECLARE_KEY(builder),
+    DECLARE_KEY(clearer),
+    DECLARE_KEY(constructor_class),
+    DECLARE_KEY(constructor_name),
+    DECLARE_KEY(definition_context),
+    DECLARE_KEY(destructor_class),
+    DECLARE_KEY(immutable_trait),
+    DECLARE_KEY(init_arg),
+    DECLARE_KEY(initializer),
+    DECLARE_KEY(insertion_order),
+    DECLARE_KEY(instance_metaclass),
+    DECLARE_KEY(is_inline),
+    DECLARE_KEY(method_metaclass),
+    DECLARE_KEY(methods),
+    DECLARE_KEY(name),
+    DECLARE_KEY(package),
+    DECLARE_KEY(package_name),
+    DECLARE_KEY(predicate),
+    DECLARE_KEY(reader),
+    DECLARE_KEY(wrapped_method_metaclass),
+    DECLARE_KEY(writer),
+    DECLARE_KEY_WITH_VALUE(package_cache_flag, "_package_cache_flag"),
+    DECLARE_KEY_WITH_VALUE(_version, "-version"),
+    DECLARE_KEY(operator)
+};
+
+SV *
+mop_prehashed_key_for (mop_prehashed_key_t key)
+{
+    return prehashed_keys[key].key;
+}
+
+U32
+mop_prehashed_hash_for (mop_prehashed_key_t key)
+{
+    return prehashed_keys[key].hash;
+}
+
+void
+mop_prehash_keys ()
+{
+    int i;
+    for (i = 0; i < key_last; i++) {
+        const char *value = prehashed_keys[i].value;
+        prehashed_keys[i].key = newSVpv(value, strlen(value));
+        PERL_HASH(prehashed_keys[i].hash, value, strlen(value));
+    }
+}
+
+XS_EXTERNAL(mop_xs_simple_reader)
+{
+#ifdef dVAR
+    dVAR; dXSARGS;
+#else
+    dXSARGS;
+#endif
+    register HE *he;
+    mop_prehashed_key_t key = (mop_prehashed_key_t)CvXSUBANY(cv).any_i32;
+    SV *self;
+
+    if (items != 1) {
+        croak("expected exactly one argument");
+    }
+
+    self = ST(0);
+
+    if (!SvROK(self)) {
+        croak("can't call %s as a class method", prehashed_keys[key].name);
+    }
+
+    if (SvTYPE(SvRV(self)) != SVt_PVHV) {
+        croak("object is not a hashref");
+    }
+
+    if ((he = hv_fetch_ent((HV *)SvRV(self), prehashed_keys[key].key, 0, prehashed_keys[key].hash))) {
+        ST(0) = HeVAL(he);
+    }
+    else {
+        ST(0) = &PL_sv_undef;
+    }
+
+    XSRETURN(1);
+}
+