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eval.c
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eval.c
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/*
* R : A Computer Language for Statistical Data Analysis
* Copyright (C) 1995, 1996 Robert Gentleman and Ross Ihaka
* Copyright (C) 1998--2013 The R Core Team.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, a copy is available at
* http://www.r-project.org/Licenses/
*/
#undef HASHING
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#define R_USE_SIGNALS 1
#include <Defn.h>
#include <Internal.h>
#include <Rinterface.h>
#include <Fileio.h>
#include <R_ext/Print.h>
#define ARGUSED(x) LEVELS(x)
static SEXP bcEval(SEXP, SEXP, Rboolean);
/* BC_PROILFING needs to be defined here and in registration.c */
/*#define BC_PROFILING*/
#ifdef BC_PROFILING
static Rboolean bc_profiling = FALSE;
#endif
static int R_Profiling = 0;
#ifdef R_PROFILING
/* BDR 2000-07-15
Profiling is now controlled by the R function Rprof(), and should
have negligible cost when not enabled.
*/
/* A simple mechanism for profiling R code. When R_PROFILING is
enabled, eval will write out the call stack every PROFSAMPLE
microseconds using the SIGPROF handler triggered by timer signals
from the ITIMER_PROF timer. Since this is the same timer used by C
profiling, the two cannot be used together. Output is written to
the file PROFOUTNAME. This is a plain text file. The first line
of the file contains the value of PROFSAMPLE. The remaining lines
each give the call stack found at a sampling point with the inner
most function first.
To enable profiling, recompile eval.c with R_PROFILING defined. It
would be possible to selectively turn profiling on and off from R
and to specify the file name from R as well, but for now I won't
bother.
The stack is traced by walking back along the context stack, just
like the traceback creation in jump_to_toplevel. One drawback of
this approach is that it does not show BUILTIN's since they don't
get a context. With recent changes to pos.to.env it seems possible
to insert a context around BUILTIN calls to that they show up in
the trace. Since there is a cost in establishing these contexts,
they are only inserted when profiling is enabled. [BDR: we have since
also added contexts for the BUILTIN calls to foreign code.]
One possible advantage of not tracing BUILTIN's is that then
profiling adds no cost when the timer is turned off. This would be
useful if we want to allow profiling to be turned on and off from
within R.
One thing that makes interpreting profiling output tricky is lazy
evaluation. When an expression f(g(x)) is profiled, lazy
evaluation will cause g to be called inside the call to f, so it
will appear as if g is called by f.
L. T. */
#ifdef Win32
# define WIN32_LEAN_AND_MEAN 1
# include <windows.h> /* for CreateEvent, SetEvent */
# include <process.h> /* for _beginthread, _endthread */
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# endif
# include <signal.h>
#endif /* not Win32 */
static FILE *R_ProfileOutfile = NULL;
static int R_Mem_Profiling=0;
extern void get_current_mem(size_t *,size_t *,size_t *); /* in memory.c */
extern unsigned long get_duplicate_counter(void); /* in duplicate.c */
extern void reset_duplicate_counter(void); /* in duplicate.c */
static int R_GC_Profiling = 0; /* indicates GC profiling */
static int R_Line_Profiling = 0; /* indicates line profiling, and also counts the filenames seen (+1) */
static char **R_Srcfiles; /* an array of pointers into the filename buffer */
static size_t R_Srcfile_bufcount; /* how big is the array above? */
static SEXP R_Srcfiles_buffer = NULL; /* a big RAWSXP to use as a buffer for filenames and pointers to them */
static int R_Profiling_Error; /* record errors here */
#ifdef Win32
HANDLE MainThread;
HANDLE ProfileEvent;
#endif /* Win32 */
/* Careful here! These functions are called asynchronously, maybe in the middle of GC,
so don't do any allocations */
/* This does a linear search through the previously recorded filenames. If
this one is new, we try to add it. FIXME: if there are eventually
too many files for an efficient linear search, do hashing. */
static int getFilenum(const char* filename) {
int fnum;
for (fnum = 0; fnum < R_Line_Profiling-1
&& strcmp(filename, R_Srcfiles[fnum]); fnum++);
if (fnum == R_Line_Profiling-1) {
size_t len = strlen(filename);
if (fnum >= R_Srcfile_bufcount) { /* too many files */
R_Profiling_Error = 1;
return 0;
}
if (R_Srcfiles[fnum] - (char*)RAW(R_Srcfiles_buffer) + len + 1 > length(R_Srcfiles_buffer)) {
/* out of space in the buffer */
R_Profiling_Error = 2;
return 0;
}
strcpy(R_Srcfiles[fnum], filename);
R_Srcfiles[fnum+1] = R_Srcfiles[fnum] + len + 1;
*(R_Srcfiles[fnum+1]) = '\0';
R_Line_Profiling++;
}
return fnum + 1;
}
/* These, together with sprintf/strcat, are not safe -- we should be
using snprintf and such and computing needed sizes, but these
settings are better than what we had. LT */
#define PROFBUFSIZ 10500
#define PROFITEMMAX 500
#define PROFLINEMAX (PROFBUFSIZ - PROFITEMMAX)
/* It would also be better to flush the buffer when it gets full,
even if the line isn't complete. But this isn't possible if we rely
on writing all line profiling files first. With these sizes
hitting the limit is fairly unlikely, but if we do then the output
file is wrong. Maybe writing an overflow marker of some sort would
be better. LT */
static void lineprof(char* buf, SEXP srcref)
{
size_t len;
if (srcref && !isNull(srcref) && (len = strlen(buf)) < PROFLINEMAX) {
int fnum, line = asInteger(srcref);
SEXP srcfile = getAttrib(srcref, R_SrcfileSymbol);
const char *filename;
if (!srcfile || TYPEOF(srcfile) != ENVSXP) return;
srcfile = findVar(install("filename"), srcfile);
if (TYPEOF(srcfile) != STRSXP || !length(srcfile)) return;
filename = CHAR(STRING_ELT(srcfile, 0));
if ((fnum = getFilenum(filename)))
snprintf(buf+len, PROFBUFSIZ - len, "%d#%d ", fnum, line);
}
}
/* FIXME: This should be done wih a proper configure test, also making
sure that the pthreads library is linked in. LT */
#ifndef Win32
#if (defined(__APPLE__) || defined(_REENTRANT) || defined(HAVE_OPENMP)) && \
! defined(HAVE_PTHREAD)
# define HAVE_PTHREAD
#endif
#ifdef HAVE_PTHREAD
# include <pthread.h>
static pthread_t R_profiled_thread;
# endif
#endif
static void doprof(int sig) /* sig is ignored in Windows */
{
RCNTXT *cptr;
char buf[PROFBUFSIZ];
size_t bigv, smallv, nodes;
size_t len;
int prevnum = R_Line_Profiling;
buf[0] = '\0';
#ifdef Win32
SuspendThread(MainThread);
#elif defined(HAVE_PTHREAD)
if (! pthread_equal(pthread_self(), R_profiled_thread)) {
pthread_kill(R_profiled_thread, sig);
return;
}
#endif /* Win32 */
if (R_Mem_Profiling){
get_current_mem(&smallv, &bigv, &nodes);
if((len = strlen(buf)) < PROFLINEMAX)
snprintf(buf+len, PROFBUFSIZ - len,
":%lu:%lu:%lu:%lu:",
(unsigned long) smallv, (unsigned long) bigv,
(unsigned long) nodes, get_duplicate_counter());
reset_duplicate_counter();
}
if (R_GC_Profiling && R_gc_running())
strcat(buf, "\"<GC>\" ");
if (R_Line_Profiling)
lineprof(buf, R_Srcref);
for (cptr = R_GlobalContext; cptr; cptr = cptr->nextcontext) {
if ((cptr->callflag & (CTXT_FUNCTION | CTXT_BUILTIN))
&& TYPEOF(cptr->call) == LANGSXP) {
SEXP fun = CAR(cptr->call);
if(strlen(buf) < PROFLINEMAX) {
strcat(buf, "\"");
strcat(buf, TYPEOF(fun) == SYMSXP ? CHAR(PRINTNAME(fun)) :
"<Anonymous>");
strcat(buf, "\" ");
if (R_Line_Profiling)
lineprof(buf, cptr->srcref);
}
}
}
/* I believe it would be slightly safer to place this _after_ the
next two bits, along with the signal() call. LT */
#ifdef Win32
ResumeThread(MainThread);
#endif /* Win32 */
for (int i = prevnum; i < R_Line_Profiling; i++)
fprintf(R_ProfileOutfile, "#File %d: %s\n", i, R_Srcfiles[i-1]);
if(strlen(buf))
fprintf(R_ProfileOutfile, "%s\n", buf);
#ifndef Win32
signal(SIGPROF, doprof);
#endif /* not Win32 */
}
#ifdef Win32
/* Profiling thread main function */
static void __cdecl ProfileThread(void *pwait)
{
int wait = *((int *)pwait);
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
while(WaitForSingleObject(ProfileEvent, wait) != WAIT_OBJECT_0) {
doprof(0);
}
}
#else /* not Win32 */
static void doprof_null(int sig)
{
signal(SIGPROF, doprof_null);
}
#endif /* not Win32 */
static void R_EndProfiling(void)
{
#ifdef Win32
SetEvent(ProfileEvent);
CloseHandle(MainThread);
#else /* not Win32 */
struct itimerval itv;
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = 0;
itv.it_value.tv_usec = 0;
setitimer(ITIMER_PROF, &itv, NULL);
signal(SIGPROF, doprof_null);
#endif /* not Win32 */
if(R_ProfileOutfile) fclose(R_ProfileOutfile);
R_ProfileOutfile = NULL;
R_Profiling = 0;
if (R_Srcfiles_buffer) {
R_ReleaseObject(R_Srcfiles_buffer);
R_Srcfiles_buffer = NULL;
}
if (R_Profiling_Error)
warning(_("source files skipped by Rprof; please increase '%s'"),
R_Profiling_Error == 1 ? "numfiles" : "bufsize");
}
static void R_InitProfiling(SEXP filename, int append, double dinterval,
int mem_profiling, int gc_profiling,
int line_profiling, int numfiles, int bufsize)
{
#ifndef Win32
struct itimerval itv;
#else
int wait;
HANDLE Proc = GetCurrentProcess();
#endif
int interval;
interval = (int)(1e6 * dinterval + 0.5);
if(R_ProfileOutfile != NULL) R_EndProfiling();
R_ProfileOutfile = RC_fopen(filename, append ? "a" : "w", TRUE);
if (R_ProfileOutfile == NULL)
error(_("Rprof: cannot open profile file '%s'"),
translateChar(filename));
if(mem_profiling)
fprintf(R_ProfileOutfile, "memory profiling: ");
if(gc_profiling)
fprintf(R_ProfileOutfile, "GC profiling: ");
if(line_profiling)
fprintf(R_ProfileOutfile, "line profiling: ");
fprintf(R_ProfileOutfile, "sample.interval=%d\n", interval);
R_Mem_Profiling=mem_profiling;
if (mem_profiling)
reset_duplicate_counter();
R_Profiling_Error = 0;
R_Line_Profiling = line_profiling;
R_GC_Profiling = gc_profiling;
if (line_profiling) {
/* Allocate a big RAW vector to use as a buffer. The first len1 bytes are an array of pointers
to strings; the actual strings are stored in the second len2 bytes. */
R_Srcfile_bufcount = numfiles;
size_t len1 = R_Srcfile_bufcount*sizeof(char *), len2 = bufsize;
R_PreserveObject( R_Srcfiles_buffer = Rf_allocVector(RAWSXP, len1 + len2) );
// memset(RAW(R_Srcfiles_buffer), 0, len1+len2);
R_Srcfiles = (char **) RAW(R_Srcfiles_buffer);
R_Srcfiles[0] = (char *)RAW(R_Srcfiles_buffer) + len1;
*(R_Srcfiles[0]) = '\0';
}
#ifdef Win32
/* need to duplicate to make a real handle */
DuplicateHandle(Proc, GetCurrentThread(), Proc, &MainThread,
0, FALSE, DUPLICATE_SAME_ACCESS);
wait = interval/1000;
if(!(ProfileEvent = CreateEvent(NULL, FALSE, FALSE, NULL)) ||
(_beginthread(ProfileThread, 0, &wait) == -1))
R_Suicide("unable to create profiling thread");
Sleep(wait/2); /* suspend this thread to ensure that the other one starts */
#else /* not Win32 */
#ifdef HAVE_PTHREAD
R_profiled_thread = pthread_self();
#endif
signal(SIGPROF, doprof);
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = interval;
itv.it_value.tv_sec = 0;
itv.it_value.tv_usec = interval;
if (setitimer(ITIMER_PROF, &itv, NULL) == -1)
R_Suicide("setting profile timer failed");
#endif /* not Win32 */
R_Profiling = 1;
}
SEXP do_Rprof(SEXP args)
{
SEXP filename;
int append_mode, mem_profiling, gc_profiling, line_profiling;
double dinterval;
int numfiles, bufsize;
#ifdef BC_PROFILING
if (bc_profiling) {
warning("cannot use R profiling while byte code profiling");
return R_NilValue;
}
#endif
if (!isString(filename = CAR(args)) || (LENGTH(filename)) != 1)
error(_("invalid '%s' argument"), "filename");
args = CDR(args);
append_mode = asLogical(CAR(args)); args = CDR(args);
dinterval = asReal(CAR(args)); args = CDR(args);
mem_profiling = asLogical(CAR(args)); args = CDR(args);
gc_profiling = asLogical(CAR(args)); args = CDR(args);
line_profiling = asLogical(CAR(args)); args = CDR(args);
numfiles = asInteger(CAR(args)); args = CDR(args);
if (numfiles < 0)
error(_("invalid '%s' argument"), "numfiles");
bufsize = asInteger(CAR(args));
if (bufsize < 0)
error(_("invalid '%s' argument"), "bufsize");
filename = STRING_ELT(filename, 0);
if (LENGTH(filename))
R_InitProfiling(filename, append_mode, dinterval, mem_profiling,
gc_profiling, line_profiling, numfiles, bufsize);
else
R_EndProfiling();
return R_NilValue;
}
#else /* not R_PROFILING */
SEXP do_Rprof(SEXP args)
{
error(_("R profiling is not available on this system"));
return R_NilValue; /* -Wall */
}
#endif /* not R_PROFILING */
/* NEEDED: A fixup is needed in browser, because it can trap errors,
* and currently does not reset the limit to the right value. */
void attribute_hidden check_stack_balance(SEXP op, int save)
{
if(save == R_PPStackTop) return;
REprintf("Warning: stack imbalance in '%s', %d then %d\n",
PRIMNAME(op), save, R_PPStackTop);
}
static SEXP forcePromise(SEXP e)
{
if (PRVALUE(e) == R_UnboundValue) {
RPRSTACK prstack;
SEXP val;
if(PRSEEN(e)) {
if (PRSEEN(e) == 1)
errorcall(R_GlobalContext->call,
_("promise already under evaluation: recursive default argument reference or earlier problems?"));
else warningcall(R_GlobalContext->call,
_("restarting interrupted promise evaluation"));
}
/* Mark the promise as under evaluation and push it on a stack
that can be used to unmark pending promises if a jump out
of the evaluation occurs. */
SET_PRSEEN(e, 1);
prstack.promise = e;
prstack.next = R_PendingPromises;
R_PendingPromises = &prstack;
val = eval(PRCODE(e), PRENV(e));
/* Pop the stack, unmark the promise and set its value field.
Also set the environment to R_NilValue to allow GC to
reclaim the promise environment; this is also useful for
fancy games with delayedAssign() */
R_PendingPromises = prstack.next;
SET_PRSEEN(e, 0);
SET_PRVALUE(e, val);
SET_NAMED (val, 2);
SET_PRENV(e, R_NilValue);
}
return PRVALUE(e);
}
/* Return value of "e" evaluated in "rho". */
/* some places, e.g. deparse2buff, call this with a promise and rho = NULL */
SEXP eval(SEXP e, SEXP rho)
{
SEXP op, tmp;
static int evalcount = 0;
R_Visible = TRUE;
/* this is needed even for self-evaluating objects or something like
'while (TRUE) NULL' will not be interruptable */
if (++evalcount > 1000) { /* was 100 before 2.8.0 */
R_CheckUserInterrupt();
#ifndef IMMEDIATE_FINALIZERS
/* finalizers are run here since this should only be called at
points where running arbitrary code should be safe */
R_RunPendingFinalizers();
#endif
evalcount = 0 ;
}
/* handle self-evluating objects with minimal overhead */
switch (TYPEOF(e)) {
case NILSXP:
case LISTSXP:
case LGLSXP:
case INTSXP:
case REALSXP:
case STRSXP:
case CPLXSXP:
case RAWSXP:
case S4SXP:
case SPECIALSXP:
case BUILTINSXP:
case ENVSXP:
case CLOSXP:
case VECSXP:
case EXTPTRSXP:
case WEAKREFSXP:
case EXPRSXP:
/* Make sure constants in expressions are NAMED before being
used as values. Setting NAMED to 2 makes sure weird calls
to replacement functions won't modify constants in
expressions. */
if (NAMED(e) <= 1) SET_NAMED(e, 2);
return e;
default: break;
}
if (!rho)
error("'rho' cannot be C NULL: detected in C-level eval");
if (!isEnvironment(rho))
error("'rho' must be an environment not %s: detected in C-level eval",
type2char(TYPEOF(rho)));
/* Save the current srcref context. */
SEXP srcrefsave = R_Srcref;
/* The use of depthsave below is necessary because of the
possibility of non-local returns from evaluation. Without this
an "expression too complex error" is quite likely. */
int depthsave = R_EvalDepth++;
/* We need to explicit set a NULL call here to circumvent attempts
to deparse the call in the error-handler */
if (R_EvalDepth > R_Expressions) {
R_Expressions = R_Expressions_keep + 500;
errorcall(R_NilValue,
_("evaluation nested too deeply: infinite recursion / options(expressions=)?"));
}
R_CheckStack();
tmp = R_NilValue; /* -Wall */
#ifdef Win32
/* This is an inlined version of Rwin_fpreset (src/gnuwin/extra.c)
and resets the precision, rounding and exception modes of a ix86
fpu.
*/
__asm__ ( "fninit" );
#endif
switch (TYPEOF(e)) {
case BCODESXP:
tmp = bcEval(e, rho, TRUE);
break;
case SYMSXP:
if (e == R_DotsSymbol)
error(_("'...' used in an incorrect context"));
if( DDVAL(e) )
tmp = ddfindVar(e,rho);
else
tmp = findVar(e, rho);
if (tmp == R_UnboundValue)
error(_("object '%s' not found"), EncodeChar(PRINTNAME(e)));
/* if ..d is missing then ddfindVar will signal */
else if (tmp == R_MissingArg && !DDVAL(e) ) {
const char *n = CHAR(PRINTNAME(e));
if(*n) error(_("argument \"%s\" is missing, with no default"),
CHAR(PRINTNAME(e)));
else error(_("argument is missing, with no default"));
}
else if (TYPEOF(tmp) == PROMSXP) {
if (PRVALUE(tmp) == R_UnboundValue) {
/* not sure the PROTECT is needed here but keep it to
be on the safe side. */
PROTECT(tmp);
tmp = forcePromise(tmp);
UNPROTECT(1);
}
else tmp = PRVALUE(tmp);
SET_NAMED(tmp, 2);
}
else if (!isNull(tmp) && NAMED(tmp) == 0)
SET_NAMED(tmp, 1);
break;
case PROMSXP:
if (PRVALUE(e) == R_UnboundValue)
/* We could just unconditionally use the return value from
forcePromise; the test avoids the function call if the
promise is already evaluated. */
forcePromise(e);
tmp = PRVALUE(e);
/* This does _not_ change the value of NAMED on the value tmp,
in contrast to the handling of promises bound to symbols in
the SYMSXP case above. The reason is that one (typically
the only) place promises appear in source code is as
wrappers for the RHS value in replacement function calls for
complex assignment expression created in applydefine(). If
the RHS value is freshly created it will have NAMED = 0 and
we want it to stay that way or a BUILTIN or SPECIAL
replacement function might have to duplicate the value
before inserting it to avoid creating cycles. (Closure
replacement functions will get the value via the SYMSXP case
from evaluating their 'value' argument so the value will
end up getting duplicated if NAMED = 2.) LT */
break;
case LANGSXP:
if (TYPEOF(CAR(e)) == SYMSXP)
/* This will throw an error if the function is not found */
PROTECT(op = findFun(CAR(e), rho));
else
PROTECT(op = eval(CAR(e), rho));
if(RTRACE(op) && R_current_trace_state()) {
Rprintf("trace: ");
PrintValue(e);
}
if (TYPEOF(op) == SPECIALSXP) {
int save = R_PPStackTop, flag = PRIMPRINT(op);
const void *vmax = vmaxget();
PROTECT(CDR(e));
R_Visible = flag != 1;
tmp = PRIMFUN(op) (e, op, CDR(e), rho);
#ifdef CHECK_VISIBILITY
if(flag < 2 && R_Visible == flag) {
char *nm = PRIMNAME(op);
if(strcmp(nm, "for")
&& strcmp(nm, "repeat") && strcmp(nm, "while")
&& strcmp(nm, "[[<-") && strcmp(nm, "on.exit"))
printf("vis: special %s\n", nm);
}
#endif
if (flag < 2) R_Visible = flag != 1;
UNPROTECT(1);
check_stack_balance(op, save);
vmaxset(vmax);
}
else if (TYPEOF(op) == BUILTINSXP) {
int save = R_PPStackTop, flag = PRIMPRINT(op);
const void *vmax = vmaxget();
RCNTXT cntxt;
PROTECT(tmp = evalList(CDR(e), rho, e, 0));
if (flag < 2) R_Visible = flag != 1;
/* We used to insert a context only if profiling,
but helps for tracebacks on .C etc. */
if (R_Profiling || (PPINFO(op).kind == PP_FOREIGN)) {
SEXP oldref = R_Srcref;
begincontext(&cntxt, CTXT_BUILTIN, e,
R_BaseEnv, R_BaseEnv, R_NilValue, R_NilValue);
R_Srcref = NULL;
tmp = PRIMFUN(op) (e, op, tmp, rho);
R_Srcref = oldref;
endcontext(&cntxt);
} else {
tmp = PRIMFUN(op) (e, op, tmp, rho);
}
#ifdef CHECK_VISIBILITY
if(flag < 2 && R_Visible == flag) {
char *nm = PRIMNAME(op);
printf("vis: builtin %s\n", nm);
}
#endif
if (flag < 2) R_Visible = flag != 1;
UNPROTECT(1);
check_stack_balance(op, save);
vmaxset(vmax);
}
else if (TYPEOF(op) == CLOSXP) {
PROTECT(tmp = promiseArgs(CDR(e), rho));
tmp = applyClosure(e, op, tmp, rho, R_BaseEnv);
UNPROTECT(1);
}
else
error(_("attempt to apply non-function"));
UNPROTECT(1);
break;
case DOTSXP:
error(_("'...' used in an incorrect context"));
default:
UNIMPLEMENTED_TYPE("eval", e);
}
R_EvalDepth = depthsave;
R_Srcref = srcrefsave;
return (tmp);
}
attribute_hidden
void SrcrefPrompt(const char * prefix, SEXP srcref)
{
/* If we have a valid srcref, use it */
if (srcref && srcref != R_NilValue) {
if (TYPEOF(srcref) == VECSXP) srcref = VECTOR_ELT(srcref, 0);
SEXP srcfile = getAttrib(srcref, R_SrcfileSymbol);
if (TYPEOF(srcfile) == ENVSXP) {
SEXP filename = findVar(install("filename"), srcfile);
if (isString(filename) && length(filename)) {
Rprintf(_("%s at %s#%d: "), prefix, CHAR(STRING_ELT(filename, 0)),
asInteger(srcref));
return;
}
}
}
/* default: */
Rprintf("%s: ", prefix);
}
/* Apply SEXP op of type CLOSXP to actuals */
static void loadCompilerNamespace(void)
{
SEXP fun, arg, expr;
PROTECT(fun = install("getNamespace"));
PROTECT(arg = mkString("compiler"));
PROTECT(expr = lang2(fun, arg));
eval(expr, R_GlobalEnv);
UNPROTECT(3);
}
static int R_disable_bytecode = 0;
void attribute_hidden R_init_jit_enabled(void)
{
if (R_jit_enabled <= 0) {
char *enable = getenv("R_ENABLE_JIT");
if (enable != NULL) {
int val = atoi(enable);
if (val > 0)
loadCompilerNamespace();
R_jit_enabled = val;
}
}
if (R_compile_pkgs <= 0) {
char *compile = getenv("R_COMPILE_PKGS");
if (compile != NULL) {
int val = atoi(compile);
if (val > 0)
R_compile_pkgs = TRUE;
else
R_compile_pkgs = FALSE;
}
}
if (R_disable_bytecode <= 0) {
char *disable = getenv("R_DISABLE_BYTECODE");
if (disable != NULL) {
int val = atoi(disable);
if (val > 0)
R_disable_bytecode = TRUE;
else
R_disable_bytecode = FALSE;
}
}
}
SEXP attribute_hidden R_cmpfun(SEXP fun)
{
SEXP packsym, funsym, call, fcall, val;
packsym = install("compiler");
funsym = install("tryCmpfun");
PROTECT(fcall = lang3(R_TripleColonSymbol, packsym, funsym));
PROTECT(call = lang2(fcall, fun));
val = eval(call, R_GlobalEnv);
UNPROTECT(2);
return val;
}
static SEXP R_compileExpr(SEXP expr, SEXP rho)
{
SEXP packsym, funsym, quotesym;
SEXP qexpr, call, fcall, val;
packsym = install("compiler");
funsym = install("compile");
quotesym = install("quote");
PROTECT(fcall = lang3(R_DoubleColonSymbol, packsym, funsym));
PROTECT(qexpr = lang2(quotesym, expr));
PROTECT(call = lang3(fcall, qexpr, rho));
val = eval(call, R_GlobalEnv);
UNPROTECT(3);
return val;
}
static SEXP R_compileAndExecute(SEXP call, SEXP rho)
{
int old_enabled = R_jit_enabled;
SEXP code, val;
R_jit_enabled = 0;
PROTECT(call);
PROTECT(rho);
PROTECT(code = R_compileExpr(call, rho));
R_jit_enabled = old_enabled;
val = bcEval(code, rho, TRUE);
UNPROTECT(3);
return val;
}
SEXP attribute_hidden do_enablejit(SEXP call, SEXP op, SEXP args, SEXP rho)
{
int old = R_jit_enabled, new;
checkArity(op, args);
new = asInteger(CAR(args));
if (new > 0)
loadCompilerNamespace();
R_jit_enabled = new;
return ScalarInteger(old);
}
SEXP attribute_hidden do_compilepkgs(SEXP call, SEXP op, SEXP args, SEXP rho)
{
int old = R_compile_pkgs, new;
checkArity(op, args);
new = asLogical(CAR(args));
if (new != NA_LOGICAL && new)
loadCompilerNamespace();
R_compile_pkgs = new;
return ScalarLogical(old);
}
/* forward declaration */
static SEXP bytecodeExpr(SEXP);
/* this function gets the srcref attribute from a statement block,
and confirms it's in the expected format */
static R_INLINE SEXP getBlockSrcrefs(SEXP call)
{
SEXP srcrefs = getAttrib(call, R_SrcrefSymbol);
if (TYPEOF(srcrefs) == VECSXP) return srcrefs;
return R_NilValue;
}
/* this function extracts one srcref, and confirms the format */
/* It assumes srcrefs has already been validated to be a VECSXP or NULL */
static R_INLINE SEXP getSrcref(SEXP srcrefs, int ind)
{
SEXP result;
if (!isNull(srcrefs)
&& length(srcrefs) > ind
&& !isNull(result = VECTOR_ELT(srcrefs, ind))
&& TYPEOF(result) == INTSXP
&& length(result) >= 6)
return result;
else
return R_NilValue;
}
SEXP applyClosure(SEXP call, SEXP op, SEXP arglist, SEXP rho, SEXP suppliedenv)
{
SEXP formals, actuals, savedrho;
volatile SEXP body, newrho;
SEXP f, a, tmp;
RCNTXT cntxt;
/* formals = list of formal parameters */
/* actuals = values to be bound to formals */
/* arglist = the tagged list of arguments */
/* protection against rho = NULL */
// these are deliberately not translated
if (!rho)
errorcall(call,
"'rho' cannot be C NULL: detected in C-level applyClosure");
if (!isEnvironment(rho))
errorcall(call, "'rho' must be an environment not %s: detected in C-level applyClosure",
type2char(TYPEOF(rho)));
formals = FORMALS(op);
body = BODY(op);
savedrho = CLOENV(op);
if (R_jit_enabled > 0 && TYPEOF(body) != BCODESXP) {
int old_enabled = R_jit_enabled;
SEXP newop;
R_jit_enabled = 0;
newop = R_cmpfun(op);
body = BODY(newop);
SET_BODY(op, body);
R_jit_enabled = old_enabled;
}
/* Set up a context with the call in it so error has access to it */
begincontext(&cntxt, CTXT_RETURN, call, savedrho, rho, arglist, op);
/* Build a list which matches the actual (unevaluated) arguments
to the formal paramters. Build a new environment which
contains the matched pairs. Ideally this environment sould be
hashed. */
PROTECT(actuals = matchArgs(formals, arglist, call));
PROTECT(newrho = NewEnvironment(formals, actuals, savedrho));
/* Turn on reference counting for the binding cells so local
assignments arguments increment REFCNT values */
for (a = actuals; a != R_NilValue; a = CDR(a))
ENABLE_REFCNT(a);
/* Use the default code for unbound formals. FIXME: It looks like
this code should preceed the building of the environment so that
this will also go into the hash table. */
/* This piece of code is destructively modifying the actuals list,
which is now also the list of bindings in the frame of newrho.
This is one place where internal structure of environment
bindings leaks out of envir.c. It should be rewritten
eventually so as not to break encapsulation of the internal
environment layout. We can live with it for now since it only
happens immediately after the environment creation. LT */
f = formals;
a = actuals;
while (f != R_NilValue) {
if (CAR(a) == R_MissingArg && CAR(f) != R_MissingArg) {
SETCAR(a, mkPROMISE(CAR(f), newrho));
SET_MISSING(a, 2);
}
f = CDR(f);
a = CDR(a);
}
if (R_envHasNoSpecialSymbols(newrho))
SET_NO_SPECIAL_SYMBOLS(newrho);
/* Fix up any extras that were supplied by usemethod. */
if (suppliedenv != R_NilValue) {
for (tmp = FRAME(suppliedenv); tmp != R_NilValue; tmp = CDR(tmp)) {
for (a = actuals; a != R_NilValue; a = CDR(a))
if (TAG(a) == TAG(tmp))
break;
if (a == R_NilValue)
/* Use defineVar instead of earlier version that added
bindings manually */
defineVar(TAG(tmp), CAR(tmp), newrho);
}
}
/* Terminate the previous context and start a new one with the
correct environment. */
endcontext(&cntxt);
/* If we have a generic function we need to use the sysparent of
the generic as the sysparent of the method because the method
is a straight substitution of the generic. */
if( R_GlobalContext->callflag == CTXT_GENERIC )
begincontext(&cntxt, CTXT_RETURN, call,
newrho, R_GlobalContext->sysparent, arglist, op);
else
begincontext(&cntxt, CTXT_RETURN, call, newrho, rho, arglist, op);
/* Get the srcref record from the closure object */
R_Srcref = getAttrib(op, R_SrcrefSymbol);
/* The default return value is NULL. FIXME: Is this really needed
or do we always get a sensible value returned? */
tmp = R_NilValue;
/* Debugging */
SET_RDEBUG(newrho, RDEBUG(op) || RSTEP(op)
|| (RDEBUG(rho) && R_BrowserLastCommand == 's')) ;
if( RSTEP(op) ) SET_RSTEP(op, 0);
if (RDEBUG(newrho)) {
int old_bl = R_BrowseLines,
blines = asInteger(GetOption1(install("deparse.max.lines")));
SEXP savesrcref;
cntxt.browserfinish = 0; /* Don't want to inherit the "f" */
/* switch to interpreted version when debugging compiled code */
if (TYPEOF(body) == BCODESXP)
body = bytecodeExpr(body);
Rprintf("debugging in: ");
if(blines != NA_INTEGER && blines > 0)
R_BrowseLines = blines;
PrintValueRec(call, rho);
R_BrowseLines = old_bl;
/* Is the body a bare symbol (PR#6804) */
if (!isSymbol(body) & !isVectorAtomic(body)){
/* Find out if the body is function with only one statement. */
if (isSymbol(CAR(body)))
tmp = findFun(CAR(body), rho);
else