/
Cover.xs
1111 lines (946 loc) · 25.9 KB
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Cover.xs
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/*
* Copyright 2001-2004, Paul Johnson (pjcj@cpan.org)
*
* This software is free. It is licensed under the same terms as Perl itself.
*
* The latest version of this software should be available from my homepage:
* http://www.pjcj.net
*
*/
#ifdef __cplusplus
extern "C" {
#endif
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifdef __cplusplus
}
#endif
#ifdef PERL_OBJECT
#define CALLOP this->*PL_op
#else
#define CALLOP *PL_op
#endif
#ifndef START_MY_CXT
/* No threads in 5.6 */
#define START_MY_CXT static my_cxt_t my_cxt;
#define dMY_CXT_SV dNOOP
#define dMY_CXT dNOOP
#define MY_CXT_INIT NOOP
#define MY_CXT my_cxt
#define pMY_CXT void
#define pMY_CXT_
#define _pMY_CXT
#define aMY_CXT
#define aMY_CXT_
#define _aMY_CXT
#endif
#define MY_CXT_KEY "Devel::Cover::_guts" XS_VERSION
#define PDEB(a) a
#define NDEB(a) ;
#define D PerlIO_printf
#define L Perl_debug_log
#define svdump(sv) do_sv_dump(0, L, (SV *)sv, 0, 10, 1, 0);
#define None 0x00000000
#define Statement 0x00000001
#define Branch 0x00000002
#define Condition 0x00000004
#define Subroutine 0x00000008
#define Path 0x00000010
#define Pod 0x00000020
#define Time 0x00000040
#define All 0xffffffff
#define CAN_PROFILE defined HAS_GETTIMEOFDAY || defined HAS_TIMES
struct unique /* Well, we'll be fairly unlucky if it's not */
{
OP *addr,
op;
};
#define CH_SZ (sizeof(struct unique) + 1)
union sequence /* Hack, hack, hackety hack. */
{
struct unique op;
char ch[CH_SZ + 1];
};
typedef struct
{
unsigned covering;
HV *cover,
*statements,
*branches,
*conditions,
#if CAN_PROFILE
*times,
#endif
*modules;
AV *ends;
char profiling_key[CH_SZ + 1];
SV *module;
int tid;
} my_cxt_t;
#ifdef USE_ITHREADS
static perl_mutex DC_mutex;
#endif
static HV *Pending_conditionals,
*Return_ops;
static int tid;
START_MY_CXT
#define collecting(criterion) (MY_CXT.covering & (criterion))
#ifdef HAS_GETTIMEOFDAY
#ifdef __cplusplus
extern "C" {
#endif
#ifdef WIN32
#include <time.h>
#else
#include <sys/time.h>
#endif
#ifdef __cplusplus
}
#endif
static double get_elapsed()
{
#ifdef WIN32
dTHX;
#endif
struct timeval time;
double e;
gettimeofday(&time, NULL);
e = time.tv_sec * 1e6 + time.tv_usec;
return e;
}
static double elapsed()
{
static double p;
double e, t;
t = get_elapsed();
e = t - p;
p = t;
return e;
}
#endif /* HAS_GETTIMEOFDAY */
#ifdef HAS_TIMES
#ifndef HZ
# ifdef CLK_TCK
# define HZ CLK_TCK
# else
# define HZ 60
# endif
#endif
static int cpu()
{
#ifdef WIN32
dTHX;
#endif
static struct tms time;
static int utime = 0,
stime = 0;
int e;
#ifndef VMS
(void)PerlProc_times(&time);
#else
(void)PerlProc_times((tbuffer_t *)&time);
#endif
e = time.tms_utime - utime + time.tms_stime - stime;
utime = time.tms_utime;
stime = time.tms_stime;
return e / HZ;
}
#endif /* HAS_TIMES */
static char *get_key(OP *o)
{
static union sequence uniq;
int i;
dTHX;
uniq.op.addr = o;
uniq.op.op = *o;
uniq.op.op.op_ppaddr = 0; /* we mess with this field */
uniq.ch[CH_SZ] = 0;
/* TODO - this shouldn't be necessary, should it? It is a hack
* because things are breaking with null chars in the key. Replace
* them with "-".
*/
for (i = 0; i < CH_SZ; i++)
/* for printing */
/* if (uniq.ch[i] < 32 || uniq.ch[i] > 126) */
if (!uniq.ch[i])
{
NDEB(D(L, "%d %d\n", i, uniq.ch[i]));
uniq.ch[i] = '-';
}
NDEB(D(L, "0x%x <%s>\n", o, uniq.ch));
return uniq.ch;
}
static void set_firsts_if_neeed(pTHX)
{
SV *init = (SV *)get_cv("Devel::Cover::first_init", 0);
SV *end = (SV *)get_cv("Devel::Cover::first_end", 0);
NDEB(svdump(end));
if (PL_initav && av_len(PL_initav) >= 0)
{
SV **cv = av_fetch(PL_initav, 0, 0);
if (*cv != init)
{
av_unshift(PL_initav, 1);
av_store(PL_initav, 0, init);
}
}
if (PL_endav && av_len(PL_endav) >= 0)
{
SV **cv = av_fetch(PL_endav, 0, 0);
if (*cv != end)
{
av_unshift(PL_endav, 1);
av_store(PL_endav, 0, end);
}
}
}
static void add_branch(pTHX_ OP *op, int br)
{
dMY_CXT;
AV *branches;
SV **count;
int c;
SV **tmp = hv_fetch(MY_CXT.branches, get_key(op), CH_SZ, 1);
if (SvROK(*tmp))
branches = (AV *) SvRV(*tmp);
else
{
*tmp = newRV_inc((SV*) (branches = newAV()));
av_unshift(branches, 2);
}
count = av_fetch(branches, br, 1);
c = SvTRUE(*count) ? SvIV(*count) + 1 : 1;
sv_setiv(*count, c);
NDEB(D(L, "Adding branch making %d at %p\n", c, op));
}
static AV *get_conditional_array(pTHX_ OP *op)
{
dMY_CXT;
AV *conds;
SV **cref = hv_fetch(MY_CXT.conditions, get_key(op), CH_SZ, 1);
if (SvROK(*cref))
conds = (AV *) SvRV(*cref);
else
*cref = newRV_inc((SV*) (conds = newAV()));
return conds;
}
static void set_conditional(pTHX_ OP *op, int cond, int value)
{
/*
* The conditional array comprises five elements:
*
* 0 - 1 iff we are in an xor and the first operand was true
* 1 - not short circuited - second operand is false
* 2 - not short circuited - second operand is true
* 3 - short circuited, or for xor second operand is false
* 4 - for xor second operand is true
*/
SV **count = av_fetch(get_conditional_array(aTHX_ op), cond, 1);
sv_setiv(*count, value);
NDEB(D(L, "Setting %d conditional to %d at %p\n", cond, value, op));
}
static void add_conditional(pTHX_ OP *op, int cond)
{
SV **count = av_fetch(get_conditional_array(aTHX_ op), cond, 1);
int c = SvTRUE(*count) ? SvIV(*count) + 1 : 1;
sv_setiv(*count, c);
NDEB(D(L, "Adding %d conditional making %d at %p\n", cond, c, op));
}
static AV *get_conds(pTHX_ AV *conds)
{
dMY_CXT;
AV *thrconds;
HV *threads;
SV *tid,
**cref;
char *t;
if (av_exists(conds, 2))
{
SV **cref = av_fetch(conds, 2, 0);
threads = (HV *) *cref;
}
else
{
threads = newHV();
HvSHAREKEYS_off(threads);
av_store(conds, 2, (SV *)threads);
}
tid = newSViv(MY_CXT.tid);
t = SvPV_nolen(tid);
cref = hv_fetch(threads, t, strlen(t), 1);
if (SvROK(*cref))
thrconds = (AV *)SvRV(*cref);
else
*cref = newRV_inc((SV*) (thrconds = newAV()));
return thrconds;
}
static void add_condition(pTHX_ SV *cond_ref, int value)
{
int final = !value;
AV *conds = (AV *) SvRV(cond_ref);
OP *next = (OP *) SvIV(*av_fetch(conds, 0, 0));
OP *(*addr)(pTHX) = (OP *(*)(pTHX)) SvIV(*av_fetch(conds, 1, 0));
I32 i;
if (!final && next != PL_op)
croak("next (%p) does not match PL_op (%p)", next, PL_op);
#ifdef USE_ITHREADS
i = 0;
conds = get_conds(aTHX_ conds);
#else
i = 2;
#endif
NDEB(D(L, "Looking through %d conditionals\n", av_len(conds) - 1));
for (; i <= av_len(conds); i++)
{
OP *op = (OP *) SvIV(*av_fetch(conds, i, 0));
SV **count = av_fetch(get_conditional_array(aTHX_ op), 0, 1);
int type = SvTRUE(*count) ? SvIV(*count) : 0;
sv_setiv(*count, 0);
/* Check if we have come from an xor with a true first op */
if (final) value = 1;
if (type == 1) value += 2;
NDEB(D(L, "Found %p: %d, %d\n", op, type, value));
add_conditional(aTHX_ op, value);
}
#ifdef USE_ITHREADS
i = -1;
#else
i = 1;
#endif
while (av_len(conds) > i) av_pop(conds);
NDEB(svdump(conds));
NDEB(D(L, "addr is %p, next is %p, PL_op is %p, length is %d final is %d\n",
addr, next, PL_op, av_len(conds), final));
if (!final) next->op_ppaddr = addr;
}
static OP *get_condition(pTHX)
{
dMY_CXT;
SV **pc = hv_fetch(Pending_conditionals, get_key(PL_op), CH_SZ, 0);
MUTEX_LOCK(&DC_mutex);
if (pc && SvROK(*pc))
{
dSP;
add_condition(aTHX_ *pc, SvTRUE(TOPs) ? 2 : 1);
}
else
{
PDEB(D(L, "All is lost, I know not where to go from %p, %p: %p\n",
PL_op, PL_op->op_targ, *pc));
/* MUTEX_LOCK(&DC_mutex); */
PDEB(svdump(Pending_conditionals));
/* MUTEX_UNLOCK(&DC_mutex); */
exit(1);
}
MUTEX_UNLOCK(&DC_mutex);
return PL_op;
}
static void finalise_conditions(pTHX)
{
/*
* Our algorithm for conditions relies on ending up at a particular
* op which we use to call get_condition(). It's possible that we
* never get to that op; for example we might return out of a sub.
* This causes us to lose coverage information.
*
* This function is called after the program has been run in order
* to collect that lost information.
*/
dMY_CXT;
HE *e;
MUTEX_LOCK(&DC_mutex);
hv_iterinit(Pending_conditionals);
while (e = hv_iternext(Pending_conditionals))
{
NDEB(D(L, "finalise_conditions\n"));
add_condition(aTHX_ hv_iterval(Pending_conditionals, e), 0);
}
MUTEX_UNLOCK(&DC_mutex);
}
static void cover_cond(pTHX)
{
dMY_CXT;
if (collecting(Branch))
{
dSP;
int val = SvTRUE(TOPs);
add_branch(aTHX_ PL_op, !val);
}
}
static void cover_logop(pTHX)
{
/*
* For OP_AND, if the first operand is false, we have short
* circuited the second, otherwise the value of the and op is the
* value of the second operand.
*
* For OP_OR, if the first operand is true, we have short circuited
* the second, otherwise the value of the and op is the value of the
* second operand.
*
* We check the value of the first operand by simply looking on the
* stack. To check the second operand it is necessary to note the
* location of the next op after this logop. When we get there, we
* look at the stack and store the coverage information indexed to
* this op.
*
* This scheme also works for OP_XOR with a small modification
* because it doesn't short circuit. See the comment below.
*
* To find out when we get to the next op we change the op_ppaddr to
* point to get_condition(), which will do the necessary work and
* then reset and run the original op_ppaddr. We also store
* information in the Pending_conditionals hash. This is keyed on
* the op and the value is an array, the first element of which is
* the op we are messing with, the second element of which is the
* op_ppaddr we overwrote, and the subsequent elements are the ops
* about which we are collecting the condition coverage information.
* Note that an op may be collecting condition coverage information
* about a number of conditions.
*/
dMY_CXT;
if (!collecting(Condition))
return;
if (cLOGOP->op_first->op_type == OP_ITER)
{
/* loop - ignore it for now*/
}
else
{
dSP;
int left_val = SvTRUE(TOPs);
NDEB(D(L, "cover_logop [%s]\n", get_key(PL_op)));
if (PL_op->op_type == OP_AND && left_val ||
PL_op->op_type == OP_ANDASSIGN && left_val ||
PL_op->op_type == OP_OR && !left_val ||
PL_op->op_type == OP_ORASSIGN && !left_val ||
PL_op->op_type == OP_XOR)
{
/* no short circuit */
OP *right = cLOGOP->op_first->op_sibling;
NDEB(op_dump(right));
if (right->op_type == OP_NEXT ||
right->op_type == OP_LAST ||
right->op_type == OP_REDO ||
right->op_type == OP_GOTO ||
right->op_type == OP_RETURN ||
right->op_type == OP_DIE)
{
/*
* If the right side of the op is a branch, we don't
* care what its value is - it won't be returning one.
* We're just glad to be here, so we chalk up success.
*/
if (right->op_type == OP_DIE)
{
NDEB(D(L, "Adding conditional [%s]\n", get_key(PL_op)));
NDEB(op_dump(PL_op));
}
add_conditional(aTHX_ PL_op, 2);
}
else
{
char *ch;
AV *conds;
SV **cref,
*cond;
OP *next;
if (PL_op->op_type == OP_XOR && left_val)
{
/*
* This is an xor. It does not short circuit. We
* have just executed the first op. When we get to
* next we will have already done the xor, so we can
* work out what the value of the second op was.
*
* We set a flag in the first element of the array
* to say that we had a true value from the first
* op.
*/
set_conditional(aTHX_ PL_op, 0, 1);
}
NDEB(op_dump(PL_op));
next = PL_op->op_next;
ch = get_key(next);
MUTEX_LOCK(&DC_mutex);
cref = hv_fetch(Pending_conditionals, ch, CH_SZ, 1);
if (SvROK(*cref))
conds = (AV *)SvRV(*cref);
else
*cref = newRV_inc((SV*) (conds = newAV()));
if (av_len(conds) < 0)
{
av_push(conds, newSViv((IV) next));
av_push(conds, newSViv((IV) next->op_ppaddr));
}
#ifdef USE_ITHREADS
conds = get_conds(aTHX_ conds);
#endif
cond = newSViv((IV) PL_op);
av_push(conds, cond);
NDEB(D(L, "Adding conditional %p to %p, making %d at %p\n",
next, next->op_targ, av_len(conds) - 1, PL_op));
NDEB(svdump(Pending_conditionals));
NDEB(op_dump(PL_op));
NDEB(op_dump(next));
next->op_ppaddr = get_condition;
MUTEX_UNLOCK(&DC_mutex);
}
}
else
{
/* short circuit */
add_conditional(aTHX_ PL_op, 3);
}
}
}
#if CAN_PROFILE
static void cover_time(pTHX)
{
dMY_CXT;
SV **count;
NV c;
if (collecting(Time))
{
/*
* Profiling information is stored against MY_CXT.profiling_key,
* the key for the op we have just run.
*/
NDEB(D(L, "Cop at %p, op at %p\n", PL_curcop, PL_op));
if (*MY_CXT.profiling_key)
{
count = hv_fetch(MY_CXT.times, MY_CXT.profiling_key, CH_SZ, 1);
c = (SvTRUE(*count) ? SvNV(*count) : 0) +
#if defined HAS_GETTIMEOFDAY
elapsed();
#else
cpu();
#endif
sv_setnv(*count, c);
NDEB(D(L, "Adding time: sum %f to <%s>\n", c, MY_CXT.profiling_key));
}
if (PL_op)
strcpy(MY_CXT.profiling_key, get_key(PL_op));
else
*MY_CXT.profiling_key = 0;
}
}
#endif
static int runops_cover(pTHX)
{
SV **count;
IV c;
char *ch;
HV *Files = 0;
int collecting_here = 1;
char *lastfile = 0;
dMY_CXT;
NDEB(D(L, "runops_cover\n"));
MUTEX_LOCK(&DC_mutex);
if (!Pending_conditionals)
{
Pending_conditionals = newHV();
HvSHAREKEYS_off(Pending_conditionals);
}
if (!Return_ops)
{
Return_ops = newHV();
HvSHAREKEYS_off(Return_ops);
}
MUTEX_UNLOCK(&DC_mutex);
if (!MY_CXT.covering)
{
/* TODO - this probably leaks all over the place */
SV **tmp;
MY_CXT.cover = newHV();
#ifdef USE_ITHREADS
HvSHAREKEYS_off(MY_CXT.cover);
#endif
tmp = hv_fetch(MY_CXT.cover, "statement", 9, 1);
MY_CXT.statements = newHV();
*tmp = newRV_inc((SV*) MY_CXT.statements);
tmp = hv_fetch(MY_CXT.cover, "branch", 6, 1);
MY_CXT.branches = newHV();
*tmp = newRV_inc((SV*) MY_CXT.branches);
tmp = hv_fetch(MY_CXT.cover, "condition", 9, 1);
MY_CXT.conditions = newHV();
*tmp = newRV_inc((SV*) MY_CXT.conditions);
#if CAN_PROFILE
tmp = hv_fetch(MY_CXT.cover, "time", 4, 1);
MY_CXT.times = newHV();
*tmp = newRV_inc((SV*) MY_CXT.times);
#endif
tmp = hv_fetch(MY_CXT.cover, "module", 6, 1);
MY_CXT.modules = newHV();
*tmp = newRV_inc((SV*) MY_CXT.modules);
#ifdef USE_ITHREADS
HvSHAREKEYS_off(MY_CXT.statements);
HvSHAREKEYS_off(MY_CXT.branches);
HvSHAREKEYS_off(MY_CXT.conditions);
#if CAN_PROFILE
HvSHAREKEYS_off(MY_CXT.times);
#endif
HvSHAREKEYS_off(MY_CXT.modules);
#endif
*MY_CXT.profiling_key = 0;
MY_CXT.module = newSVpv("", 0);
MY_CXT.covering = All;
MY_CXT.tid = tid++;
}
#if defined HAS_GETTIMEOFDAY
elapsed();
#elif defined HAS_TIMES
cpu();
#endif
for (;;)
{
NDEB(D(L, "running func %p\n", PL_op->op_ppaddr));
NDEB(D(L, "op is %s\n", OP_NAME(PL_op)));
if (!MY_CXT.covering)
goto call_fptr;
/* Nothing to collect when we've hijacked the ppaddr */
if (PL_op->op_ppaddr == get_condition)
goto call_fptr;
/* Check to see whether we are interested in this file */
if (PL_op->op_type == OP_NEXTSTATE)
{
char *file = CopFILE(cCOP);
NDEB(D(L, "File: %s:%ld\n", file, CopLINE(cCOP)));
if (file && (!lastfile || lastfile && strNE(lastfile, file)))
{
if (!Files)
Files = get_hv("Devel::Cover::Files", FALSE);
if (Files)
{
SV **f = hv_fetch(Files, file, strlen(file), 0);
collecting_here = f ? SvIV(*f) : 1;
NDEB(D(L, "File: %s:%ld [%d]\n",
file, CopLINE(cCOP), collecting_here));
}
lastfile = file;
}
#if (PERL_VERSION > 6)
if (SvTRUE(MY_CXT.module))
{
STRLEN mlen,
flen = strlen(file);
char *m = SvPV(MY_CXT.module, mlen);
if (flen >= mlen && strnEQ(m, file + flen - mlen, mlen))
{
SV **dir = hv_fetch(MY_CXT.modules, file, strlen(file), 1);
if (!SvROK(*dir))
{
SV *cwd = newSV(0);
AV *d = newAV();
*dir = newRV_inc((SV*) d);
av_push(d, newSVsv(MY_CXT.module));
if (getcwd_sv(cwd))
{
av_push(d, newSVsv(cwd));
NDEB(D(L, "require %s as %s from %s\n",
m, file, SvPV_nolen(cwd)));
}
}
}
sv_setpv(MY_CXT.module, "");
set_firsts_if_neeed(aTHX);
}
#endif
}
else if (collecting_here && PL_op->op_type == OP_ENTERSUB)
{
/* If we are jumping somewhere we might not be collecting
* coverage there, so store where we will be coming back to
* so we can turn on coverage straight away. We need to
* store more than one return op because a non collecting
* sub may call back to a collecting sub.
*/
hv_fetch(Return_ops, get_key(PL_op->op_next), CH_SZ, 1);
NDEB(D(L, "adding return op %p\n", PL_op->op_next));
}
if (!collecting_here)
{
#if CAN_PROFILE
cover_time(aTHX);
*MY_CXT.profiling_key = 0;
#endif
NDEB(D(L, "op %p is %s\n", PL_op, OP_NAME(PL_op)));
if (hv_exists(Return_ops, get_key(PL_op), CH_SZ))
collecting_here = 1;
else
goto call_fptr;
}
/*
* We are about the run the op PL_op, so we'll collect
* information for it now.
*/
switch (PL_op->op_type)
{
case OP_SETSTATE:
case OP_NEXTSTATE:
case OP_DBSTATE:
{
#if CAN_PROFILE
cover_time(aTHX);
#endif
if (collecting(Statement))
{
ch = get_key(PL_op);
count = hv_fetch(MY_CXT.statements, ch, CH_SZ, 1);
c = SvTRUE(*count) ? SvIV(*count) + 1 : 1;
sv_setiv(*count, c);
NDEB(op_dump(PL_op));
}
break;
}
case OP_COND_EXPR:
{
cover_cond(aTHX);
break;
}
case OP_AND:
case OP_OR:
case OP_ANDASSIGN:
case OP_ORASSIGN:
case OP_XOR:
{
cover_logop(aTHX);
break;
}
case OP_REQUIRE:
{
dSP;
sv_setsv(MY_CXT.module, TOPs);
NDEB(D(L, "require %s\n", SvPV_nolen(MY_CXT.module)));
break;
}
default:
; /* IBM's xlC compiler on AIX is very picky */
}
call_fptr:
if (!(PL_op = CALL_FPTR(PL_op->op_ppaddr)(aTHX)))
{
#if CAN_PROFILE
cover_time(aTHX);
#endif
break;
}
PERL_ASYNC_CHECK();
}
TAINT_NOT;
return 0;
}
static int runops_orig(pTHX)
{
NDEB(D(L, "runops_orig\n"));
while ((PL_op = CALL_FPTR(PL_op->op_ppaddr)(aTHX)))
{
PERL_ASYNC_CHECK();
}
TAINT_NOT;
return 0;
}
static char *svclassnames[] =
{
"B::NULL",
"B::IV",
"B::NV",
"B::RV",
"B::PV",
"B::PVIV",
"B::PVNV",
"B::PVMG",
"B::BM",
"B::GV",
"B::PVLV",
"B::AV",
"B::HV",
"B::CV",
"B::FM",
"B::IO",
};
static SV *make_sv_object(pTHX_ SV *arg, SV *sv)
{
IV iv;
char *type;
dMY_CXT;
iv = PTR2IV(sv);
type = svclassnames[SvTYPE(sv)];
sv_setiv(newSVrv(arg, type), iv);
return arg;
}
typedef OP *B__OP;
typedef AV *B__AV;
MODULE = Devel::Cover PACKAGE = Devel::Cover
PROTOTYPES: ENABLE
void
set_criteria(flag)
unsigned flag
PREINIT:
dMY_CXT;
PPCODE:
/* fprintf(stderr, "Cover set to %d\n", flag); */
PL_runops = (MY_CXT.covering = flag) ? runops_cover : runops_orig;
void
add_criteria(flag)
unsigned flag
PREINIT:
dMY_CXT;
PPCODE:
PL_runops = (MY_CXT.covering |= flag) ? runops_cover : runops_orig;
void
remove_criteria(flag)
unsigned flag
PREINIT:
dMY_CXT;
PPCODE:
PL_runops = (MY_CXT.covering &= ~flag) ? runops_cover : runops_orig;
unsigned
get_criteria()
PREINIT:
dMY_CXT;
CODE:
RETVAL = MY_CXT.covering;
OUTPUT:
RETVAL
unsigned
coverage_none()
CODE:
RETVAL = None;
OUTPUT:
RETVAL
unsigned
coverage_statement()
CODE:
RETVAL = Statement;
OUTPUT:
RETVAL
unsigned
coverage_branch()
CODE:
RETVAL = Branch;
OUTPUT:
RETVAL
unsigned
coverage_condition()
CODE:
RETVAL = Condition;
OUTPUT:
RETVAL
unsigned
coverage_subroutine()
CODE:
RETVAL = Subroutine;
OUTPUT:
RETVAL
unsigned
coverage_path()
CODE:
RETVAL = Path;
OUTPUT:
RETVAL
unsigned
coverage_pod()
CODE: