| Commit | Line | Data |
|---|
| 1594b447 |
1 | #include "EXTERN.h" |
| 2 | #include "perl.h" |
| 3 | #include "XSUB.h" |
| 4 | #include <stdio.h> |
| 5 | #include <string.h> |
| 6 | #include "proto.h" |
| 7 | |
| 8 | /* lifted from op.c (w/linklist -> Perl_linklist) */ |
| 9 | |
| 10 | #define LINKLIST(o) ((o)->op_next ? (o)->op_next : Perl_linklist((OP*)o)) |
| 11 | |
| 12 | /* pointer to old PL_check entersub entry to be populated in init */ |
| 13 | |
| 14 | STATIC OP *(*dbl_old_ck_entersub)(pTHX_ OP *op); |
| 15 | |
| 16 | /* replacement PL_check entersub entry */ |
| 17 | |
| 18 | STATIC OP *dbl_ck_entersub(pTHX_ OP *o) { |
| 19 | OP *kid; |
| 20 | OP *last; |
| 21 | OP *curop; |
| 22 | HV *stash; |
| 23 | I32 type = o->op_type; |
| 24 | SV *sv; |
| 25 | char* stack_save; |
| 26 | HV* to_lift; |
| 27 | SV** to_lift_pack_ref; |
| 28 | HV* to_lift_pack_hash; |
| 29 | SV** to_lift_flag_ref; |
| 30 | |
| 31 | o = dbl_old_ck_entersub(aTHX_ o); /* let the original do its job */ |
| 32 | |
| 33 | kid = cUNOPo->op_first; |
| 34 | |
| 35 | if (kid->op_type != OP_NULL) /* pushmark for method call ... */ |
| 36 | return o; |
| 37 | |
| 38 | last = kLISTOP->op_last; |
| 39 | |
| 40 | if (last->op_type != OP_NULL) /* not what we expected */ |
| 41 | return o; |
| 42 | |
| 43 | kid = cUNOPx(last)->op_first; |
| 44 | |
| 45 | if (kid->op_type != OP_GV) /* not a GV so ignore */ |
| 46 | return o; |
| 47 | |
| 48 | stash = GvSTASH(kGVOP_gv); |
| 49 | |
| 50 | /* printf("Calling GV %s -> %s\n", |
| 51 | HvNAME(stash), GvNAME(kGVOP_gv)); */ |
| 52 | |
| 53 | to_lift = get_hv("Devel::BeginLift::lift", FALSE); |
| 54 | |
| 55 | if (!to_lift) |
| 56 | return o; |
| 57 | |
| 58 | to_lift_pack_ref = hv_fetch(to_lift, HvNAME(stash), strlen(HvNAME(stash)), |
| 59 | FALSE); |
| 60 | |
| 61 | if (!to_lift_pack_ref || !SvROK(*to_lift_pack_ref)) |
| 62 | return o; /* not a hashref */ |
| 63 | |
| 64 | to_lift_pack_hash = (HV*) SvRV(*to_lift_pack_ref); |
| 65 | |
| 66 | to_lift_flag_ref = hv_fetch(to_lift_pack_hash, GvNAME(kGVOP_gv), |
| 67 | strlen(GvNAME(kGVOP_gv)), FALSE); |
| 68 | |
| 69 | if (!to_lift_flag_ref || !SvTRUE(*to_lift_flag_ref)) |
| 70 | return o; |
| 71 | |
| 72 | /* shamelessly lifted from fold_constants in op.c */ |
| 73 | |
| 74 | stack_save = PL_stack_sp; |
| 75 | curop = LINKLIST(o); |
| 76 | o->op_next = 0; |
| 77 | PL_op = curop; |
| 78 | CALLRUNOPS(aTHX); |
| 79 | |
| 80 | if (PL_stack_sp > stack_save) { /* sub returned something */ |
| 81 | sv = *(PL_stack_sp--); |
| 82 | if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */ |
| 83 | pad_swipe(o->op_targ, FALSE); |
| 84 | else if (SvTEMP(sv)) { /* grab mortal temp? */ |
| 85 | (void)SvREFCNT_inc(sv); |
| 86 | SvTEMP_off(sv); |
| 87 | } |
| 88 | op_free(o); |
| 89 | if (type == OP_RV2GV) |
| 90 | return newGVOP(OP_GV, 0, (GV*)sv); |
| 91 | return newSVOP(OP_CONST, 0, sv); |
| 92 | } else { |
| 93 | /* this bit not lifted, handles the 'sub doesn't return stuff' case |
| 94 | which fold_constants can ignore */ |
| 95 | op_free(o); |
| 96 | return newOP(OP_NULL, 0); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | static int initialized = 0; |
| 101 | |
| 102 | MODULE = Devel::BeginLift PACKAGE = Devel::BeginLift |
| 103 | |
| 104 | PROTOTYPES: DISABLE |
| 105 | |
| 106 | void |
| 107 | setup() |
| 108 | CODE: |
| 109 | if (!initialized++) { |
| 110 | dbl_old_ck_entersub = PL_check[OP_ENTERSUB]; |
| 111 | PL_check[OP_ENTERSUB] = dbl_ck_entersub; |
| 112 | } |
| 113 | |
| 114 | void |
| 115 | teardown() |
| 116 | CODE: |
| 117 | /* ensure we only uninit when number of teardown calls matches |
| 118 | number of setup calls */ |
| 119 | if (initialized && !--initialized) { |
| 120 | PL_check[OP_ENTERSUB] = dbl_old_ck_entersub; |
| 121 | } |
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