| 1 | /* op.h
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| 2 | *
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| 3 | * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
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| 4 | * 2000, 2001, 2002, 2003, 2004, 2005 by Larry Wall and others
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| 5 | *
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| 6 | * You may distribute under the terms of either the GNU General Public
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| 7 | * License or the Artistic License, as specified in the README file.
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| 8 | *
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| 9 | */
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| 10 |
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| 11 | /*
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| 12 | * The fields of BASEOP are:
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| 13 | * op_next Pointer to next ppcode to execute after this one.
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| 14 | * (Top level pre-grafted op points to first op,
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| 15 | * but this is replaced when op is grafted in, when
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| 16 | * this op will point to the real next op, and the new
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| 17 | * parent takes over role of remembering starting op.)
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| 18 | * op_ppaddr Pointer to current ppcode's function.
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| 19 | * op_type The type of the operation.
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| 20 | * op_flags Flags common to all operations. See OPf_* below.
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| 21 | * op_private Flags peculiar to a particular operation (BUT,
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| 22 | * by default, set to the number of children until
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| 23 | * the operation is privatized by a check routine,
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| 24 | * which may or may not check number of children).
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| 25 | */
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| 26 |
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| 27 | #ifdef DEBUGGING_OPS
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| 28 | #define OPCODE opcode
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| 29 | #else
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| 30 | #define OPCODE U16
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| 31 | #endif
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| 32 |
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| 33 | #ifdef BASEOP_DEFINITION
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| 34 | #define BASEOP BASEOP_DEFINITION
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| 35 | #else
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| 36 | #define BASEOP \
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| 37 | OP* op_next; \
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| 38 | OP* op_sibling; \
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| 39 | OP* (CPERLscope(*op_ppaddr))(pTHX); \
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| 40 | PADOFFSET op_targ; \
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| 41 | OPCODE op_type; \
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| 42 | U16 op_seq; \
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| 43 | U8 op_flags; \
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| 44 | U8 op_private;
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| 45 | #endif
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| 46 |
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| 47 | #define OP_GIMME(op,dfl) \
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| 48 | (((op)->op_flags & OPf_WANT) == OPf_WANT_VOID ? G_VOID : \
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| 49 | ((op)->op_flags & OPf_WANT) == OPf_WANT_SCALAR ? G_SCALAR : \
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| 50 | ((op)->op_flags & OPf_WANT) == OPf_WANT_LIST ? G_ARRAY : \
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| 51 | dfl)
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| 52 |
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| 53 | /*
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| 54 | =head1 "Gimme" Values
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| 55 |
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| 56 | =for apidoc Amn|U32|GIMME_V
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| 57 | The XSUB-writer's equivalent to Perl's C<wantarray>. Returns C<G_VOID>,
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| 58 | C<G_SCALAR> or C<G_ARRAY> for void, scalar or list context,
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| 59 | respectively.
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| 60 |
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| 61 | =for apidoc Amn|U32|GIMME
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| 62 | A backward-compatible version of C<GIMME_V> which can only return
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| 63 | C<G_SCALAR> or C<G_ARRAY>; in a void context, it returns C<G_SCALAR>.
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| 64 | Deprecated. Use C<GIMME_V> instead.
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| 65 |
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| 66 | =cut
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| 67 | */
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| 68 |
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| 69 | #define GIMME_V OP_GIMME(PL_op, block_gimme())
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| 70 |
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| 71 | /* Public flags */
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| 72 |
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| 73 | #define OPf_WANT 3 /* Mask for "want" bits: */
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| 74 | #define OPf_WANT_VOID 1 /* Want nothing */
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| 75 | #define OPf_WANT_SCALAR 2 /* Want single value */
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| 76 | #define OPf_WANT_LIST 3 /* Want list of any length */
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| 77 | #define OPf_KIDS 4 /* There is a firstborn child. */
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| 78 | #define OPf_PARENS 8 /* This operator was parenthesized. */
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| 79 | /* (Or block needs explicit scope entry.) */
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| 80 | #define OPf_REF 16 /* Certified reference. */
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| 81 | /* (Return container, not containee). */
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| 82 | #define OPf_MOD 32 /* Will modify (lvalue). */
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| 83 | #define OPf_STACKED 64 /* Some arg is arriving on the stack. */
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| 84 | #define OPf_SPECIAL 128 /* Do something weird for this op: */
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| 85 | /* On local LVAL, don't init local value. */
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| 86 | /* On OP_SORT, subroutine is inlined. */
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| 87 | /* On OP_NOT, inversion was implicit. */
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| 88 | /* On OP_LEAVE, don't restore curpm. */
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| 89 | /* On truncate, we truncate filehandle */
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| 90 | /* On control verbs, we saw no label */
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| 91 | /* On flipflop, we saw ... instead of .. */
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| 92 | /* On UNOPs, saw bare parens, e.g. eof(). */
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| 93 | /* On OP_ENTERSUB || OP_NULL, saw a "do". */
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| 94 | /* On OP_EXISTS, treat av as av, not avhv. */
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| 95 | /* On OP_(ENTER|LEAVE)EVAL, don't clear $@ */
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| 96 | /* On OP_ENTERITER, loop var is per-thread */
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| 97 | /* On pushre, re is /\s+/ imp. by split " " */
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| 98 | /* On regcomp, "use re 'eval'" was in scope */
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| 99 | /* On OP_READLINE, was <$filehandle> */
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| 100 | /* On RV2[ACGHS]V, don't create GV--in
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| 101 | defined()*/
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| 102 | /* On OP_DBSTATE, indicates breakpoint
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| 103 | * (runtime property) */
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| 104 | /* On OP_AELEMFAST, indiciates pad var */
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| 105 |
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| 106 | /* old names; don't use in new code, but don't break them, either */
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| 107 | #define OPf_LIST OPf_WANT_LIST
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| 108 | #define OPf_KNOW OPf_WANT
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| 109 |
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| 110 | #define GIMME \
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| 111 | (PL_op->op_flags & OPf_WANT \
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| 112 | ? ((PL_op->op_flags & OPf_WANT) == OPf_WANT_LIST \
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| 113 | ? G_ARRAY \
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| 114 | : G_SCALAR) \
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| 115 | : dowantarray())
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| 116 |
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| 117 | /* NOTE: OP_NEXTSTATE, OP_DBSTATE, and OP_SETSTATE (i.e. COPs) carry lower
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| 118 | * bits of PL_hints in op_private */
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