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-rw-r--r--contrib/perl5/ext/Opcode/Opcode.xs468
1 files changed, 468 insertions, 0 deletions
diff --git a/contrib/perl5/ext/Opcode/Opcode.xs b/contrib/perl5/ext/Opcode/Opcode.xs
new file mode 100644
index 000000000000..e853cf19a364
--- /dev/null
+++ b/contrib/perl5/ext/Opcode/Opcode.xs
@@ -0,0 +1,468 @@
+#include "EXTERN.h"
+#include "perl.h"
+#include "XSUB.h"
+
+/* PL_maxo shouldn't differ from MAXO but leave room anyway (see BOOT:) */
+#define OP_MASK_BUF_SIZE (MAXO + 100)
+
+/* XXX op_named_bits and opset_all are never freed */
+static HV *op_named_bits; /* cache shared for whole process */
+static SV *opset_all; /* mask with all bits set */
+static IV opset_len; /* length of opmasks in bytes */
+static int opcode_debug = 0;
+
+static SV *new_opset _((SV *old_opset));
+static int verify_opset _((SV *opset, int fatal));
+static void set_opset_bits _((char *bitmap, SV *bitspec, int on, char *opname));
+static void put_op_bitspec _((char *optag, STRLEN len, SV *opset));
+static SV *get_op_bitspec _((char *opname, STRLEN len, int fatal));
+
+
+/* Initialise our private op_named_bits HV.
+ * It is first loaded with the name and number of each perl operator.
+ * Then the builtin tags :none and :all are added.
+ * Opcode.pm loads the standard optags from __DATA__
+ * XXX leak-alert: data allocated here is never freed, call this
+ * at most once
+ */
+
+static void
+op_names_init(void)
+{
+ int i;
+ STRLEN len;
+ char **op_names;
+ char *bitmap;
+
+ op_named_bits = newHV();
+ op_names = get_op_names();
+ for(i=0; i < PL_maxo; ++i) {
+ SV *sv;
+ sv = newSViv(i);
+ SvREADONLY_on(sv);
+ hv_store(op_named_bits, op_names[i], strlen(op_names[i]), sv, 0);
+ }
+
+ put_op_bitspec(":none",0, sv_2mortal(new_opset(Nullsv)));
+
+ opset_all = new_opset(Nullsv);
+ bitmap = SvPV(opset_all, len);
+ i = len-1; /* deal with last byte specially, see below */
+ while(i-- > 0)
+ bitmap[i] = 0xFF;
+ /* Take care to set the right number of bits in the last byte */
+ bitmap[len-1] = (PL_maxo & 0x07) ? ~(0xFF << (PL_maxo & 0x07)) : 0xFF;
+ put_op_bitspec(":all",0, opset_all); /* don't mortalise */
+}
+
+
+/* Store a new tag definition. Always a mask.
+ * The tag must not already be defined.
+ * SV *mask is copied not referenced.
+ */
+
+static void
+put_op_bitspec(char *optag, STRLEN len, SV *mask)
+{
+ SV **svp;
+ verify_opset(mask,1);
+ if (!len)
+ len = strlen(optag);
+ svp = hv_fetch(op_named_bits, optag, len, 1);
+ if (SvOK(*svp))
+ croak("Opcode tag \"%s\" already defined", optag);
+ sv_setsv(*svp, mask);
+ SvREADONLY_on(*svp);
+}
+
+
+
+/* Fetch a 'bits' entry for an opname or optag (IV/PV).
+ * Note that we return the actual entry for speed.
+ * Always sv_mortalcopy() if returing it to user code.
+ */
+
+static SV *
+get_op_bitspec(char *opname, STRLEN len, int fatal)
+{
+ SV **svp;
+ if (!len)
+ len = strlen(opname);
+ svp = hv_fetch(op_named_bits, opname, len, 0);
+ if (!svp || !SvOK(*svp)) {
+ if (!fatal)
+ return Nullsv;
+ if (*opname == ':')
+ croak("Unknown operator tag \"%s\"", opname);
+ if (*opname == '!') /* XXX here later, or elsewhere? */
+ croak("Can't negate operators here (\"%s\")", opname);
+ if (isALPHA(*opname))
+ croak("Unknown operator name \"%s\"", opname);
+ croak("Unknown operator prefix \"%s\"", opname);
+ }
+ return *svp;
+}
+
+
+
+static SV *
+new_opset(SV *old_opset)
+{
+ SV *opset;
+ if (old_opset) {
+ verify_opset(old_opset,1);
+ opset = newSVsv(old_opset);
+ }
+ else {
+ opset = NEWSV(1156, opset_len);
+ Zero(SvPVX(opset), opset_len + 1, char);
+ SvCUR_set(opset, opset_len);
+ (void)SvPOK_only(opset);
+ }
+ /* not mortalised here */
+ return opset;
+}
+
+
+static int
+verify_opset(SV *opset, int fatal)
+{
+ char *err = Nullch;
+ if (!SvOK(opset)) err = "undefined";
+ else if (!SvPOK(opset)) err = "wrong type";
+ else if (SvCUR(opset) != opset_len) err = "wrong size";
+ if (err && fatal) {
+ croak("Invalid opset: %s", err);
+ }
+ return !err;
+}
+
+
+static void
+set_opset_bits(char *bitmap, SV *bitspec, int on, char *opname)
+{
+ if (SvIOK(bitspec)) {
+ int myopcode = SvIV(bitspec);
+ int offset = myopcode >> 3;
+ int bit = myopcode & 0x07;
+ if (myopcode >= PL_maxo || myopcode < 0)
+ croak("panic: opcode \"%s\" value %d is invalid", opname, myopcode);
+ if (opcode_debug >= 2)
+ warn("set_opset_bits bit %2d (off=%d, bit=%d) %s %s\n",
+ myopcode, offset, bit, opname, (on)?"on":"off");
+ if (on)
+ bitmap[offset] |= 1 << bit;
+ else
+ bitmap[offset] &= ~(1 << bit);
+ }
+ else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
+
+ STRLEN len;
+ char *specbits = SvPV(bitspec, len);
+ if (opcode_debug >= 2)
+ warn("set_opset_bits opset %s %s\n", opname, (on)?"on":"off");
+ if (on)
+ while(len-- > 0) bitmap[len] |= specbits[len];
+ else
+ while(len-- > 0) bitmap[len] &= ~specbits[len];
+ }
+ else
+ croak("panic: invalid bitspec for \"%s\" (type %u)",
+ opname, (unsigned)SvTYPE(bitspec));
+}
+
+
+static void
+opmask_add(SV *opset) /* THE ONLY FUNCTION TO EDIT PL_op_mask ITSELF */
+{
+ int i,j;
+ char *bitmask;
+ STRLEN len;
+ int myopcode = 0;
+
+ verify_opset(opset,1); /* croaks on bad opset */
+
+ if (!PL_op_mask) /* caller must ensure PL_op_mask exists */
+ croak("Can't add to uninitialised PL_op_mask");
+
+ /* OPCODES ALREADY MASKED ARE NEVER UNMASKED. See opmask_addlocal() */
+
+ bitmask = SvPV(opset, len);
+ for (i=0; i < opset_len; i++) {
+ U16 bits = bitmask[i];
+ if (!bits) { /* optimise for sparse masks */
+ myopcode += 8;
+ continue;
+ }
+ for (j=0; j < 8 && myopcode < PL_maxo; )
+ PL_op_mask[myopcode++] |= bits & (1 << j++);
+ }
+}
+
+static void
+opmask_addlocal(SV *opset, char *op_mask_buf) /* Localise PL_op_mask then opmask_add() */
+{
+ char *orig_op_mask = PL_op_mask;
+ SAVEPPTR(PL_op_mask);
+#if !defined(PERL_OBJECT)
+ /* XXX casting to an ordinary function ptr from a member function ptr
+ * is disallowed by Borland
+ */
+ if (opcode_debug >= 2)
+ SAVEDESTRUCTOR((void(CPERLscope(*))_((void*)))warn,"PL_op_mask restored");
+#endif
+ PL_op_mask = &op_mask_buf[0];
+ if (orig_op_mask)
+ Copy(orig_op_mask, PL_op_mask, PL_maxo, char);
+ else
+ Zero(PL_op_mask, PL_maxo, char);
+ opmask_add(opset);
+}
+
+
+
+MODULE = Opcode PACKAGE = Opcode
+
+PROTOTYPES: ENABLE
+
+BOOT:
+ assert(PL_maxo < OP_MASK_BUF_SIZE);
+ opset_len = (PL_maxo + 7) / 8;
+ if (opcode_debug >= 1)
+ warn("opset_len %ld\n", (long)opset_len);
+ op_names_init();
+
+
+void
+_safe_call_sv(Package, mask, codesv)
+ char * Package
+ SV * mask
+ SV * codesv
+PPCODE:
+ char op_mask_buf[OP_MASK_BUF_SIZE];
+ GV *gv;
+
+ ENTER;
+
+ opmask_addlocal(mask, op_mask_buf);
+
+ save_aptr(&PL_endav);
+ PL_endav = (AV*)sv_2mortal((SV*)newAV()); /* ignore END blocks for now */
+
+ save_hptr(&PL_defstash); /* save current default stack */
+ /* the assignment to global defstash changes our sense of 'main' */
+ PL_defstash = gv_stashpv(Package, GV_ADDWARN); /* should exist already */
+
+ /* defstash must itself contain a main:: so we'll add that now */
+ /* take care with the ref counts (was cause of long standing bug) */
+ /* XXX I'm still not sure if this is right, GV_ADDWARN should warn! */
+ gv = gv_fetchpv("main::", GV_ADDWARN, SVt_PVHV);
+ sv_free((SV*)GvHV(gv));
+ GvHV(gv) = (HV*)SvREFCNT_inc(PL_defstash);
+
+ PUSHMARK(SP);
+ perl_call_sv(codesv, GIMME|G_EVAL|G_KEEPERR); /* use callers context */
+ SPAGAIN; /* for the PUTBACK added by xsubpp */
+ LEAVE;
+
+
+int
+verify_opset(opset, fatal = 0)
+ SV *opset
+ int fatal
+
+
+void
+invert_opset(opset)
+ SV *opset
+CODE:
+ {
+ char *bitmap;
+ STRLEN len = opset_len;
+ opset = sv_2mortal(new_opset(opset)); /* verify and clone opset */
+ bitmap = SvPVX(opset);
+ while(len-- > 0)
+ bitmap[len] = ~bitmap[len];
+ /* take care of extra bits beyond PL_maxo in last byte */
+ if (PL_maxo & 07)
+ bitmap[opset_len-1] &= ~(0xFF << (PL_maxo & 0x07));
+ }
+ ST(0) = opset;
+
+
+void
+opset_to_ops(opset, desc = 0)
+ SV *opset
+ int desc
+PPCODE:
+ {
+ STRLEN len;
+ int i, j, myopcode;
+ char *bitmap = SvPV(opset, len);
+ char **names = (desc) ? get_op_descs() : get_op_names();
+ verify_opset(opset,1);
+ for (myopcode=0, i=0; i < opset_len; i++) {
+ U16 bits = bitmap[i];
+ for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++) {
+ if ( bits & (1 << j) )
+ XPUSHs(sv_2mortal(newSVpv(names[myopcode], 0)));
+ }
+ }
+ }
+
+
+void
+opset(...)
+CODE:
+ int i, j;
+ SV *bitspec, *opset;
+ char *bitmap;
+ STRLEN len, on;
+ opset = sv_2mortal(new_opset(Nullsv));
+ bitmap = SvPVX(opset);
+ for (i = 0; i < items; i++) {
+ char *opname;
+ on = 1;
+ if (verify_opset(ST(i),0)) {
+ opname = "(opset)";
+ bitspec = ST(i);
+ }
+ else {
+ opname = SvPV(ST(i), len);
+ if (*opname == '!') { on=0; ++opname;--len; }
+ bitspec = get_op_bitspec(opname, len, 1);
+ }
+ set_opset_bits(bitmap, bitspec, on, opname);
+ }
+ ST(0) = opset;
+
+
+#define PERMITING (ix == 0 || ix == 1)
+#define ONLY_THESE (ix == 0 || ix == 2)
+
+void
+permit_only(safe, ...)
+ SV *safe
+ALIAS:
+ permit = 1
+ deny_only = 2
+ deny = 3
+CODE:
+ int i, on;
+ SV *bitspec, *mask;
+ char *bitmap, *opname;
+ STRLEN len;
+
+ if (!SvROK(safe) || !SvOBJECT(SvRV(safe)) || SvTYPE(SvRV(safe))!=SVt_PVHV)
+ croak("Not a Safe object");
+ mask = *hv_fetch((HV*)SvRV(safe), "Mask",4, 1);
+ if (ONLY_THESE) /* *_only = new mask, else edit current */
+ sv_setsv(mask, sv_2mortal(new_opset(PERMITING ? opset_all : Nullsv)));
+ else
+ verify_opset(mask,1); /* croaks */
+ bitmap = SvPVX(mask);
+ for (i = 1; i < items; i++) {
+ on = PERMITING ? 0 : 1; /* deny = mask bit on */
+ if (verify_opset(ST(i),0)) { /* it's a valid mask */
+ opname = "(opset)";
+ bitspec = ST(i);
+ }
+ else { /* it's an opname/optag */
+ opname = SvPV(ST(i), len);
+ /* invert if op has ! prefix (only one allowed) */
+ if (*opname == '!') { on = !on; ++opname; --len; }
+ bitspec = get_op_bitspec(opname, len, 1); /* croaks */
+ }
+ set_opset_bits(bitmap, bitspec, on, opname);
+ }
+ ST(0) = &PL_sv_yes;
+
+
+
+void
+opdesc(...)
+PPCODE:
+ int i, myopcode;
+ STRLEN len;
+ SV **args;
+ char **op_desc = get_op_descs();
+ /* copy args to a scratch area since we may push output values onto */
+ /* the stack faster than we read values off it if masks are used. */
+ args = (SV**)SvPVX(sv_2mortal(newSVpv((char*)&ST(0), items*sizeof(SV*))));
+ for (i = 0; i < items; i++) {
+ char *opname = SvPV(args[i], len);
+ SV *bitspec = get_op_bitspec(opname, len, 1);
+ if (SvIOK(bitspec)) {
+ myopcode = SvIV(bitspec);
+ if (myopcode < 0 || myopcode >= PL_maxo)
+ croak("panic: opcode %d (%s) out of range",myopcode,opname);
+ XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
+ }
+ else if (SvPOK(bitspec) && SvCUR(bitspec) == opset_len) {
+ int b, j;
+ char *bitmap = SvPV(bitspec,PL_na);
+ myopcode = 0;
+ for (b=0; b < opset_len; b++) {
+ U16 bits = bitmap[b];
+ for (j=0; j < 8 && myopcode < PL_maxo; j++, myopcode++)
+ if (bits & (1 << j))
+ XPUSHs(sv_2mortal(newSVpv(op_desc[myopcode], 0)));
+ }
+ }
+ else
+ croak("panic: invalid bitspec for \"%s\" (type %u)",
+ opname, (unsigned)SvTYPE(bitspec));
+ }
+
+
+void
+define_optag(optagsv, mask)
+ SV *optagsv
+ SV *mask
+CODE:
+ STRLEN len;
+ char *optag = SvPV(optagsv, len);
+ put_op_bitspec(optag, len, mask); /* croaks */
+ ST(0) = &PL_sv_yes;
+
+
+void
+empty_opset()
+CODE:
+ ST(0) = sv_2mortal(new_opset(Nullsv));
+
+void
+full_opset()
+CODE:
+ ST(0) = sv_2mortal(new_opset(opset_all));
+
+void
+opmask_add(opset)
+ SV *opset
+PREINIT:
+ if (!PL_op_mask)
+ Newz(0, PL_op_mask, PL_maxo, char);
+
+void
+opcodes()
+PPCODE:
+ if (GIMME == G_ARRAY) {
+ croak("opcodes in list context not yet implemented"); /* XXX */
+ }
+ else {
+ XPUSHs(sv_2mortal(newSViv(PL_maxo)));
+ }
+
+void
+opmask()
+CODE:
+ ST(0) = sv_2mortal(new_opset(Nullsv));
+ if (PL_op_mask) {
+ char *bitmap = SvPVX(ST(0));
+ int myopcode;
+ for(myopcode=0; myopcode < PL_maxo; ++myopcode) {
+ if (PL_op_mask[myopcode])
+ bitmap[myopcode >> 3] |= 1 << (myopcode & 0x07);
+ }
+ }
+
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