iSharkFly-Open
/
fis-gtm
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
fis-gtm/sr_port/m_set.c

951 lines
38 KiB
C
Raw Permalink Blame History

/****************************************************************
* *
* Copyright 2001, 2011 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "gtm_string.h"
#include "gtm_ctype.h"
#include "compiler.h"
#include "mdq.h"
#include "opcode.h"
#include "indir_enum.h"
#include "nametabtyp.h"
#include "toktyp.h"
#include "funsvn.h"
#include "mmemory.h"
#include "advancewindow.h"
#include "namelook.h"
#include "cmd.h"
#include "svnames.h"
#include "gdsroot.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "alias.h"
#ifdef UNICODE_SUPPORTED
#include "gtm_utf8.h"
#endif
GBLREF boolean_t badchar_inhibit;
GBLREF triple *curtchain;
GBLREF char director_token, window_token;
GBLREF mident director_ident, window_ident;
GBLREF boolean_t gtm_utf8_mode;
error_def(ERR_INVSVN);
error_def(ERR_VAREXPECTED);
error_def(ERR_RPARENMISSING);
error_def(ERR_EQUAL);
error_def(ERR_COMMA);
error_def(ERR_SVNOSET);
error_def(ERR_NOALIASLIST);
error_def(ERR_ALIASEXPECTED);
error_def(ERR_DZWRNOPAREN);
error_def(ERR_DZWRNOALIAS);
LITREF unsigned char svn_index[], fun_index[];
LITREF nametabent svn_names[], fun_names[];
LITREF svn_data_type svn_data[];
LITREF fun_data_type fun_data[];
#define FIRST_SETLEFT_NOTSEEN -1 /* see comment against variable "first_setleft_invalid" for details */
/* This macro is used to insert the conditional jump triples (in SET $PIECE/$EXTRACT) ahead of the global variable
* reference of the SET $PIECE target. This is to ensure the naked indicator is not touched in cases where the M-standard
* says it should not be. e.g. set $piece(^x,"delim",2,1) should not touch naked indicator since 2>1.
*/
#define DQINSCURTARGCHAIN(curtargtriple) \
{ \
dqins(curtargchain, exorder, curtargtriple); \
assert(curtargchain->exorder.fl == curtargtriple); \
curtargchain = curtargtriple; \
}
#define RESTORE_CURTCHAIN_IF_NEEDED \
{ \
if (curtchain_switched) \
{ \
assert(NULL != save_curtchain); \
setcurtchain(save_curtchain); \
curtchain_switched = FALSE; \
} \
}
#define SYNTAX_ERROR(errnum) \
{ \
RESTORE_CURTCHAIN_IF_NEEDED; \
stx_error(errnum); \
return FALSE; \
}
#define SYNTAX_ERROR_NOREPORT_HERE \
{ \
RESTORE_CURTCHAIN_IF_NEEDED; \
return FALSE; \
}
void m_set_create_temporaries(triple *sub, opctype put_oc);
void allow_dzwrtac_as_mident(void);
int m_set(void)
{
/* Some comment on "parse_warn". It is set to TRUE whenever the parse encounters an
invalid setleft target.
* Note that even if "parse_warn" is TRUE, we should not return FALSE right away but need to continue the parse
* until the end of the current SET command. This way any remaining commands in the current parse line will be
* parsed and triples generated for them. This is necessary just in case the currently parsed invalid SET command
* does not get executed at runtime (due to postconditionals etc.)
*
* Some comment on the need for "first_setleft_invalid". This variable is needed only in the
* case we encounter an invalid-SVN/invalid-FCN/unsettable-SVN as a target of the SET. We need to evaluate the
* right-hand-side of the SET command only if at least one valid setleft target is parsed before an invalid setleft
* target is encountered. This is because we still need to execute the valid setlefts at runtime before triggering
* a runtime error for the invalid setleft. If the first setleft target is an invalid one, then there is no need
* to evaluate the right-hand-side. In fact, in this case, adding triples (corresponding to the right hand side)
* to the execution chain could cause problems with emit_code later in the compilation as the destination
* for the right hand side triples could now be undefined (for example a valid SVN on the left side of the
* SET would have generated an OC_SVPUT triple with one of its operands holding the result of the right
* hand side evaluation, but an invalid SVN on the left side which would have instead caused an OC_RTERROR triple
* to have been generated leaving no triple to receive the result of the right hand side evaluation thus causing
* emit_code to be confused and GTMASSERT). Therefore discard all triples generated by the right hand side in this case.
* By the same reasoning, discard all triples generated by setleft targets AFTER this invalid one as well.
* "first_setleft_invalid" is set to TRUE if the first setleft target is invalid and set to FALSE if the first setleft
* target is valid. It is initialized to -1 before the start of the parse.
*/
int index, setop, delimlen;
int first_val_lit, last_val_lit, nakedzalias;
boolean_t first_is_lit, last_is_lit, got_lparen, delim1char, is_extract, valid_char;
boolean_t alias_processing, have_lh_alias;
opctype put_oc;
oprtype v, delimval, firstval, lastval, *result, resptr;
triple *curtargchain, *delimiter, discardcurtchain, *first, *get, *jmptrp1, *jmptrp2, *last, *obp, *put;
triple *s, *s0, *s1, save_targchain, *save_curtchain, *save_curtchain1, *sub, targchain, *tmp;
mint delimlit;
mval *delim_mval;
mvar *mvarptr;
boolean_t parse_warn; /* set to TRUE in case of an invalid SVN etc. */
boolean_t curtchain_switched; /* set to TRUE if a setcurtchain was done */
int first_setleft_invalid; /* set to TRUE if the first setleft target is invalid */
boolean_t temp_subs_was_FALSE;
union
{
uint4 unichar_val;
unsigned char unibytes_val[4];
} unichar;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
TREF(temp_subs) = FALSE;
dqinit(&targchain, exorder);
result = (oprtype *)mcalloc(SIZEOF(oprtype));
resptr = put_indr(result);
delimiter = sub = last = NULL;
/* A SET clause must be entirely alias related or a normal set. Parenthized multiple sets of aliases are not allowed
* and will trigger an error. This is because the source and targets of aliases require different values and references
* than normal sets do and thus cannot be mixed.
*/
if (alias_processing = (TK_ASTERISK == window_token))
advancewindow();
if (got_lparen = (TK_LPAREN == window_token))
{
if (alias_processing)
stx_error(ERR_NOALIASLIST);
advancewindow();
TREF(temp_subs) = TRUE;
}
/* Some explanation: The triples from the left hand side of the SET expression that are
* expressly associated with fetching (in case of set $piece/$extract) and/or storing of
* the target value are removed from curtchain and placed on the targchain. Later, these
* triples will be added to the end of curtchain to do the finishing store of the target
* after the righthand side has been evaluated. This is per the M standard.
*
* Note that SET $PIECE/$EXTRACT have special conditions in which the first argument is not referenced at all.
* (e.g. set $piece(^a," ",3,2) in this case 3 > 2 so this should not evaluate ^a and therefore should not
* modify the naked indicator). That is, the triples that do these conditional checks need to be inserted
* ahead of the OC_GVNAME of ^a, all of which need to be inserted on the targchain. But the conditionalization
* can be done only after parsing the first argument of the SET $PIECE and examining the remaining arguments.
* Therefore we maintain the "curtargchain" variable which stores the value of the "targchain" at the beginning
* of the iteration (at the start of the $PIECE parsing) and all the conditionalization will be inserted right
* here which is guaranteed to be ahead of where the OC_GVNAME gets inserted.
*
* For example, SET $PIECE(^A(x,y),delim,first,last)=RHS will generate a final triple chain as follows
*
* A - Triples to evaluate subscripts (x,y) of the global ^A
* A - Triples to evaluate delim
* A - Triples to evaluate first
* A - Triples to evaluate last
* B - Triples to evaluate RHS
* C - Triples to do conditional check (e.g. first > last etc.)
* C - Triples to branch around if the checks indicate this is a null operation SET $PIECE
* D - Triple that does OC_GVNAME of ^A
* D - Triple that does OC_SETPIECE to determine the new value
* D - Triple that does OC_GVPUT of the new value into ^A(x,y)
* This is the point where the conditional check triples will branch around to if they chose to.
*
* A - triples that evaluates the arguments/subscripts in the left-hand-side of the SET command
* These triples are built in "curtchain"
* B - triples that evaluates the arguments/subscripts in the right-hand-side of the SET command
* These triples are built in "curtchain"
* C - triples that do conditional check for any $PIECE/$EXTRACT in the left side of the SET command.
* These triples are built in "curtargchain"
* D - triples that generate the reference to the target of the SET and the store into the target.
* These triples are built in "targchain"
*
* Note alias processing does not support the SET *(...)=.. type syntax because the type of argument
* created for RHS processing is dependent on the LHS receiver type and we do not support more than one
* type of source argument in a single SET.
*/
first_setleft_invalid = FIRST_SETLEFT_NOTSEEN;
curtchain_switched = FALSE;
nakedzalias = have_lh_alias = FALSE;
save_curtchain = NULL;
assert(FIRST_SETLEFT_NOTSEEN != TRUE);
assert(FIRST_SETLEFT_NOTSEEN != FALSE);
for (parse_warn = FALSE; ; parse_warn = FALSE)
{
curtargchain = targchain.exorder.bl;
jmptrp1 = jmptrp2 = NULL;
delim1char = is_extract = FALSE;
allow_dzwrtac_as_mident(); /* Allows $ZWRTACxxx as target to be treated as an mident */
switch (window_token)
{
case TK_IDENT:
/* A slight diversion first. If this is a $ZWRTAC set (indication of $ in first char
* is currently enough to signify that), then we need to check a few conditions first.
* If this is a "naked $ZWRTAC", meaning no numeric suffix, then this is a flag that
* all the $ZWRTAC vars in the local variable tree need to be kill *'d which will not
* be generating a SET instruction. First we need to verify that fact and make sure
* we are not in PARENs and not doing alias processing. Note *any* value can be
* specified as the source but while it will be evaluated, it is NOT stored anywhere.
*/
if ('$' == *window_ident.addr)
{ /* We have a $ZWRTAC<xx> target */
if (got_lparen)
/* We don't allow $ZWRTACxxx to be specified in a parenthesized list.
* Verify that first
*/
SYNTAX_ERROR(ERR_DZWRNOPAREN);
if (STR_LIT_LEN(DOLLAR_ZWRTAC) == window_ident.len)
{ /* Ok, this is a naked $ZWRTAC targeted set */
if (alias_processing)
SYNTAX_ERROR(ERR_DZWRNOALIAS);
nakedzalias = TRUE;
/* This opcode doesn't really need args but it is easier to fit in with the rest
* of m_set processing to pass it the result arg, which there may actually be
* a use for someday..
*/
put = maketriple(OC_CLRALSVARS);
put->operand[0] = resptr;
dqins(targchain.exorder.bl, exorder, put);
advancewindow();
break;
}
}
/* If we are doing alias processing, there are two possibilities:
* 1) LHS is unsubscripted - it is an alias variable being created or replaced. Need to parse
* the varname as if this were a regular set.
* 2) LHS is subscripted - it is an alias container variable being created or replaced. The
* processing here is to pass the base variable index to the store routine so bypass the
* lvn() call.
*/
if (!alias_processing || TK_LPAREN == director_token)
{ /* Normal variable processing or we have a lh alias container */
if (!lvn(&v, OC_PUTINDX, 0))
SYNTAX_ERROR_NOREPORT_HERE;
if (OC_PUTINDX == v.oprval.tref->opcode)
{
dqdel(v.oprval.tref, exorder);
dqins(targchain.exorder.bl, exorder, v.oprval.tref);
sub = v.oprval.tref;
put_oc = OC_PUTINDX;
if (TREF(temp_subs))
m_set_create_temporaries(sub, put_oc);
}
} else
{ /* Have alias variable. Argument is index into var table rather than pointer to var */
have_lh_alias = TRUE;
/* We only want the variable index in this case. Since the entire hash structure to which
* this variable is going to be pointing to is changing, doing anything that calls fetch()
* is somewhat pointless so we avoid it by just accessing the variable information
* directly.
*/
mvarptr = get_mvaddr(&window_ident);
v = put_ilit(mvarptr->mvidx);
advancewindow();
}
/* Determine correct storing triple */
put = maketriple((!alias_processing ? OC_STO :
(have_lh_alias ? OC_SETALS2ALS : OC_SETALSIN2ALSCT)));
put->operand[0] = v;
put->operand[1] = resptr;
dqins(targchain.exorder.bl, exorder, put);
break;
case TK_CIRCUMFLEX:
if (alias_processing)
SYNTAX_ERROR(ERR_ALIASEXPECTED);
s1 = curtchain->exorder.bl;
if (!gvn())
SYNTAX_ERROR_NOREPORT_HERE;
for (sub = curtchain->exorder.bl; sub != s1; sub = sub->exorder.bl)
{
put_oc = sub->opcode;
if (OC_GVNAME == put_oc || OC_GVNAKED == put_oc || OC_GVEXTNAM == put_oc)
break;
}
assert(OC_GVNAME == put_oc || OC_GVNAKED == put_oc || OC_GVEXTNAM == put_oc);
dqdel(sub, exorder);
dqins(targchain.exorder.bl, exorder, sub);
if (TREF(temp_subs))
m_set_create_temporaries(sub, put_oc);
put = maketriple(OC_GVPUT);
put->operand[0] = resptr;
dqins(targchain.exorder.bl, exorder, put);
break;
case TK_ATSIGN:
if (alias_processing)
SYNTAX_ERROR(ERR_ALIASEXPECTED);
if (!indirection(&v))
SYNTAX_ERROR_NOREPORT_HERE;
if (!got_lparen && TK_EQUAL != window_token)
{
assert(!curtchain_switched);
put = newtriple(OC_COMMARG);
put->operand[0] = v;
put->operand[1] = put_ilit(indir_set);
return TRUE;
}
put = maketriple(OC_INDSET);
put->operand[0] = v;
put->operand[1] = resptr;
dqins(targchain.exorder.bl, exorder, put);
break;
case TK_DOLLAR:
if (alias_processing)
SYNTAX_ERROR(ERR_ALIASEXPECTED);
advancewindow();
if (TK_IDENT != window_token)
SYNTAX_ERROR(ERR_VAREXPECTED);
if (TK_LPAREN != director_token)
{ /* Look for intrinsic special variables */
s1 = curtchain->exorder.bl;
if (0 > (index = namelook(svn_index, svn_names, window_ident.addr, window_ident.len)))
{
STX_ERROR_WARN(ERR_INVSVN); /* sets "parse_warn" to TRUE */
} else if (!svn_data[index].can_set)
{
STX_ERROR_WARN(ERR_SVNOSET); /* sets "parse_warn" to TRUE */
}
advancewindow();
if (!parse_warn)
{
if (SV_ETRAP != svn_data[index].opcode && SV_ZTRAP != svn_data[index].opcode)
{ /* Setting of $ZTRAP or $ETRAP must go through opp_svput because they
* may affect the stack pointer. All others directly to op_svput().
*/
put = maketriple(OC_SVPUT);
} else
put = maketriple(OC_PSVPUT);
put->operand[0] = put_ilit(svn_data[index].opcode);
put->operand[1] = resptr;
dqins(targchain.exorder.bl, exorder, put);
} else
{ /* OC_RTERROR triple would have been inserted in curtchain by ins_errtriple
* (invoked by stx_error). To maintain consistency with the "if" portion of
* this code, we need to move this triple to the "targchain".
*/
tmp = curtchain->exorder.bl; /* corresponds to put_ilit(FALSE) in ins_errtriple */
tmp = tmp->exorder.bl; /* corresponds to put_ilit(in_error) in ins_errtriple */
tmp = tmp->exorder.bl; /* corresponds to newtriple(OC_RTERROR) in ins_errtriple */
assert(OC_RTERROR == tmp->opcode);
dqdel(tmp, exorder);
dqins(targchain.exorder.bl, exorder, tmp);
CHKTCHAIN(&targchain);
}
break;
}
/* Only 4 function names allowed on left side: $[Z]Piece and $[Z]Extract */
index = namelook(fun_index, fun_names, window_ident.addr, window_ident.len);
if (0 > index)
{
STX_ERROR_WARN(ERR_INVFCN); /* sets "parse_warn" to TRUE */
/* OC_RTERROR triple would have been inserted in "curtchain" by ins_errtriple
* (invoked by stx_error). We need to switch it to "targchain" to be consistent
* with every other codepath in this module.
*/
tmp = curtchain->exorder.bl; /* corresponds to put_ilit(FALSE) in ins_errtriple */
tmp = tmp->exorder.bl; /* corresponds to put_ilit(in_error) in ins_errtriple */
tmp = tmp->exorder.bl; /* corresponds to newtriple(OC_RTERROR) in ins_errtriple */
assert(OC_RTERROR == tmp->opcode);
dqdel(tmp, exorder);
dqins(targchain.exorder.bl, exorder, tmp);
CHKTCHAIN(&targchain);
advancewindow(); /* skip past the function name */
advancewindow(); /* skip past the left paren */
/* Parse the remaining arguments until corresponding RIGHT-PAREN/SPACE/EOL is reached */
if (!parse_until_rparen_or_space())
SYNTAX_ERROR_NOREPORT_HERE;
} else
{
switch(fun_data[index].opcode)
{
case OC_FNPIECE:
setop = OC_SETPIECE;
break;
case OC_FNEXTRACT:
is_extract = TRUE;
setop = OC_SETEXTRACT;
break;
case OC_FNZPIECE:
setop = OC_SETZPIECE;
break;
case OC_FNZEXTRACT:
is_extract = TRUE;
setop = OC_SETZEXTRACT;
break;
default:
SYNTAX_ERROR(ERR_VAREXPECTED);
}
advancewindow();
advancewindow();
/* Although we see the get (target) variable first, we need to save it's processing
* on another chain -- the targchain -- because the retrieval of the target is bypassed
* and the naked indicator is not reset if the first/last parameters are not set in a
* logical manner (must be > 0 and first <= last). So the evaluation order is
* delimiter (if $piece), first, last, RHS of the set and then the target if applicable.
* Set up primary action triple now since it is ref'd by the put triples generated below.
*/
s = maketriple(setop);
/* Even for SET[Z]PIECE and SET[Z]EXTRACT, the SETxxxxx opcodes
* do not do the final store, they only create the final value TO be
* stored so generate the triples that will actually do the store now.
* Note we are still building triples on the original curtchain.
*/
switch (window_token)
{
case TK_IDENT:
if (!lvn(&v, OC_PUTINDX, 0))
SYNTAX_ERROR(ERR_VAREXPECTED);
if (OC_PUTINDX == v.oprval.tref->opcode)
{
dqdel(v.oprval.tref, exorder);
dqins(targchain.exorder.bl, exorder, v.oprval.tref);
sub = v.oprval.tref;
put_oc = OC_PUTINDX;
if (TREF(temp_subs))
m_set_create_temporaries(sub, put_oc);
}
get = maketriple(OC_FNGET);
get->operand[0] = v;
put = maketriple(OC_STO);
put->operand[0] = v;
put->operand[1] = put_tref(s);
break;
case TK_ATSIGN:
if (!indirection(&v))
SYNTAX_ERROR(ERR_VAREXPECTED);
get = maketriple(OC_INDGET);
get->operand[0] = v;
get->operand[1] = put_str(0, 0);
put = maketriple(OC_INDSET);
put->operand[0] = v;
put->operand[1] = put_tref(s);
break;
case TK_CIRCUMFLEX:
s1 = curtchain->exorder.bl;
if (!gvn())
SYNTAX_ERROR_NOREPORT_HERE;
for (sub = curtchain->exorder.bl; sub != s1 ; sub = sub->exorder.bl)
{
put_oc = sub->opcode;
if ((OC_GVNAME == put_oc) || (OC_GVNAKED == put_oc)
|| (OC_GVEXTNAM == put_oc))
break;
}
assert((OC_GVNAME == put_oc) || (OC_GVNAKED == put_oc)
|| (OC_GVEXTNAM == put_oc));
dqdel(sub, exorder);
dqins(targchain.exorder.bl, exorder, sub);
if (TREF(temp_subs))
m_set_create_temporaries(sub, put_oc);
get = maketriple(OC_FNGVGET);
get->operand[0] = put_str(0, 0);
put = maketriple(OC_GVPUT);
put->operand[0] = put_tref(s);
break;
default:
SYNTAX_ERROR(ERR_VAREXPECTED);
}
s->operand[0] = put_tref(get);
/* Code to fetch args for target triple are on targchain. Put get there now too. */
dqins(targchain.exorder.bl, exorder, get);
CHKTCHAIN(&targchain);
if (!is_extract)
{ /* Set $[z]piece */
delimiter = newtriple(OC_PARAMETER);
s->operand[1] = put_tref(delimiter);
first = newtriple(OC_PARAMETER);
delimiter->operand[1] = put_tref(first);
/* Process delimiter string ($[z]piece only) */
if (TK_COMMA != window_token)
SYNTAX_ERROR(ERR_COMMA);
advancewindow();
if (!strexpr(&delimval))
SYNTAX_ERROR_NOREPORT_HERE;
assert(TRIP_REF == delimval.oprclass);
} else
{ /* Set $[Z]Extract */
first = newtriple(OC_PARAMETER);
s->operand[1] = put_tref(first);
}
/* Process first integer value */
if (window_token != TK_COMMA)
firstval = put_ilit(1);
else
{
advancewindow();
if (!intexpr(&firstval))
SYNTAX_ERROR(ERR_COMMA);
assert(firstval.oprclass == TRIP_REF);
}
first->operand[0] = firstval;
if (first_is_lit = (OC_ILIT == firstval.oprval.tref->opcode))
{
assert(ILIT_REF ==firstval.oprval.tref->operand[0].oprclass);
first_val_lit = firstval.oprval.tref->operand[0].oprval.ilit;
}
if (TK_COMMA != window_token)
{ /* There is no "last" value. Only if 1 char literal delimiter and
* no "last" value can we generate shortcut code to op_set[z]p1 entry
* instead of op_set[z]piece. Note if UTF8 mode is in effect, then this
* optimization applies if the literal is one unicode char which may in
* fact be up to 4 bytes but will still be passed as a single unsigned
* integer.
*/
if (!is_extract)
{
delim_mval = &delimval.oprval.tref->operand[0].oprval.mlit->v;
valid_char = TRUE; /* Basic assumption unles proven otherwise */
if (delimval.oprval.tref->opcode == OC_LIT &&
(1 == (gtm_utf8_mode ?
MV_FORCE_LEN(delim_mval) : delim_mval->str.len)))
{ /* Single char delimiter for set $piece */
UNICODE_ONLY(
if (gtm_utf8_mode)
{ /* We have a supposed single char delimiter but it
* must be a valid utf8 char to be used by
* op_setp1() and MV_FORCE_LEN won't tell us that.
*/
valid_char = UTF8_VALID(delim_mval->str.addr,
(delim_mval->str.addr
+ delim_mval->str.len),
delimlen);
if (!valid_char && !badchar_inhibit)
UTF8_BADCHAR(0, delim_mval->str.addr,
(delim_mval->str.addr
+ delim_mval->str.len),
0, NULL);
}
);
if (valid_char || 1 == delim_mval->str.len)
{ /* This reference to a one character literal or a single
* byte invalid utf8 character that needs to be turned into
* an explict formated integer literal instead
*/
unichar.unichar_val = 0;
if (!gtm_utf8_mode)
{ /* Single byte delimiter */
assert(1 == delim_mval->str.len);
UNIX_ONLY(s->opcode = OC_SETZP1);
VMS_ONLY(s->opcode = OC_SETP1);
unichar.unibytes_val[0] = *delim_mval->str.addr;
}
UNICODE_ONLY(
else
{ /* Potentially multiple bytes in one int */
assert(SIZEOF(int) >= delim_mval->str.len);
memcpy(unichar.unibytes_val,
delim_mval->str.addr,
delim_mval->str.len);
s->opcode = OC_SETP1;
}
);
delimlit = (mint)unichar.unichar_val;
delimiter->operand[0] = put_ilit(delimlit);
delim1char = TRUE;
}
}
}
if (!delim1char)
{ /* Was not handled as a single char delim by code above either bcause it
* was (1) not set $piece, or (2) was not a single char delim or (3) it was
* not a VALID utf8 single char delim and badchar was inhibited.
*/
if (!is_extract)
delimiter->operand[0] = delimval;
last = newtriple(OC_PARAMETER);
first->operand[1] = put_tref(last);
last->operand[0] = first->operand[0]; /* start = end range */
}
/* Generate test sequences for first/last to bypass the set operation if
* first/last are not in a usable form
*/
if (first_is_lit)
{
if (1 > first_val_lit)
{
jmptrp1 = maketriple(OC_JMP);
DQINSCURTARGCHAIN(jmptrp1);
}
/* note else no test necessary since first == last and are > 0 */
} else
{ /* Generate test for first being <= 0 */
jmptrp1 = maketriple(OC_COBOOL);
jmptrp1->operand[0] = first->operand[0];
DQINSCURTARGCHAIN(jmptrp1);
jmptrp1 = maketriple(OC_JMPLEQ);
DQINSCURTARGCHAIN(jmptrp1);
}
} else
{ /* There IS a last value */
if (!is_extract)
delimiter->operand[0] = delimval;
last = newtriple(OC_PARAMETER);
first->operand[1] = put_tref(last);
advancewindow();
if (!intexpr(&lastval))
SYNTAX_ERROR_NOREPORT_HERE;
assert(lastval.oprclass == TRIP_REF);
last->operand[0] = lastval;
/* Generate inline code to test first/last for usability and if found
* lacking, branch around the getchain and the actual store so we avoid
* setting the naked indicator so far as the target gvn is concerned.
*/
if (last_is_lit = (lastval.oprval.tref->opcode == OC_ILIT))
{ /* Case 1: last is a literal */
assert(lastval.oprval.tref->operand[0].oprclass == ILIT_REF);
last_val_lit = lastval.oprval.tref->operand[0].oprval.ilit;
if (last_val_lit < 1 || (first_is_lit && first_val_lit > last_val_lit))
{ /* .. and first is a literal and one or both of them is no good
* so unconditionally branch around the whole thing.
*/
jmptrp1 = maketriple(OC_JMP);
DQINSCURTARGCHAIN(jmptrp1);
} /* else case actually handled at next 'if' .. */
} else
{ /* Last is not literal. Do test if it is greater than 0 */
jmptrp1 = maketriple(OC_COBOOL);
jmptrp1->operand[0] = last->operand[0];
DQINSCURTARGCHAIN(jmptrp1);
jmptrp1 = maketriple(OC_JMPLEQ);
DQINSCURTARGCHAIN(jmptrp1);
}
if (!last_is_lit || !first_is_lit)
{ /* Compare to check that last >= first */
jmptrp2 = maketriple(OC_VXCMPL);
jmptrp2->operand[0] = first->operand[0];
jmptrp2->operand[1] = last->operand[0];
DQINSCURTARGCHAIN(jmptrp2);
jmptrp2 = maketriple(OC_JMPGTR);
DQINSCURTARGCHAIN(jmptrp2);
}
}
}
if (window_token != TK_RPAREN)
SYNTAX_ERROR(ERR_RPARENMISSING);
advancewindow();
if (!parse_warn)
{
dqins(targchain.exorder.bl, exorder, s);
dqins(targchain.exorder.bl, exorder, put);
CHKTCHAIN(&targchain);
/* Put result operand on the chain. End of chain depends on whether or not
* we are calling the shortcut or the full set-piece code
*/
if (delim1char)
first->operand[1] = resptr;
else
last->operand[1] = resptr;
/* Set jump targets if we did tests above. The function "tnxtarg" operates on "curtchain"
* but we want to set targets based on "targchain", so temporarily switch them. Should not
* use "save_curtchain" here as it might already be in use.
*/
save_curtchain1 = setcurtchain(&targchain);
if (NULL != jmptrp1)
tnxtarg(&jmptrp1->operand[0]);
if (NULL != jmptrp2)
tnxtarg(&jmptrp2->operand[0]);
setcurtchain(save_curtchain1);
}
break;
case TK_ASTERISK:
/* The only way an asterisk can be detected here is if we are inside a list so mention this is
* not possible and give error.
*/
stx_error(ERR_NOALIASLIST);
return FALSE;
default:
SYNTAX_ERROR(ERR_VAREXPECTED);
}
if (FIRST_SETLEFT_NOTSEEN == first_setleft_invalid)
{
first_setleft_invalid = parse_warn;
if (first_setleft_invalid)
{ /* We are not going to evaluate the right hand side of the SET command. This means
* we should not evaluate any more setleft targets (whether they parse validly or not)
* as well since their source (the RHS of the set) is undefined. To achieve this, we
* switch to a temporary chain (both for curtchain and targchain) that will be discarded finally.
*/
/* save curtchain */
dqinit(&discardcurtchain, exorder);
save_curtchain = setcurtchain(&discardcurtchain);
assert(!curtchain_switched);
curtchain_switched = TRUE;
/* save targchain */
save_targchain = targchain;
dqinit(&targchain, exorder);
}
}
assert(FIRST_SETLEFT_NOTSEEN != first_setleft_invalid);
if (!got_lparen)
break;
if (TK_COMMA == window_token)
advancewindow();
else
{
if (TK_RPAREN == window_token)
{
advancewindow();
break;
} else
SYNTAX_ERROR(ERR_RPARENMISSING);
}
}
if (TK_EQUAL != window_token)
SYNTAX_ERROR(ERR_EQUAL);
advancewindow();
assert(FIRST_SETLEFT_NOTSEEN != first_setleft_invalid);
temp_subs_was_FALSE = (FALSE == TREF(temp_subs)); /* Note down if temp_subs is FALSE at this point */
/* If we are in alias processing mode, the RHS cannot be an expression but must be one of a subscripted or unsubscripted
* local variable, or a $$func(..) function call.
*/
if (!alias_processing)
{ /* Normal case first - evaluate expression creating triples on the current chain */
if (!expr(result))
SYNTAX_ERROR_NOREPORT_HERE;
} else
{ /* Alias processing -- determine which of the three types of sources we have: var, subscripted var or $$func */
allow_dzwrtac_as_mident(); /* Allow source of $ZWRTACxxx as an mident */
if (TK_IDENT != window_token)
{ /* Check if we have a $$func() call source */
if (TK_DOLLAR == window_token && TK_DOLLAR == director_token)
{ /* Parse the function only with exfunc(). We definitely do not want an expression */
TREF(temp_subs) = TRUE; /* RHS $$ function detected - need temporary */
advancewindow();
if (!exfunc(result, TRUE))
SYNTAX_ERROR_NOREPORT_HERE;
if (OC_SETALSIN2ALSCT == put->opcode)
/* Change opcode to create an alias container from the returned alias */
put->opcode = OC_SETFNRETIN2ALSCT;
else
{ /* Change opcode to create an alias from the returned alias */
assert(OC_SETALS2ALS == put->opcode);
put->opcode = OC_SETFNRETIN2ALS;
}
} else
/* Else, only local variables allowed as aliases */
SYNTAX_ERROR(ERR_ALIASEXPECTED);
} else
{ /* Alias var source */
if ('$' == *window_ident.addr && STR_LIT_LEN(DOLLAR_ZWRTAC) >= window_ident.len)
/* $ZWRTAC is not allowed as a "source" value. Must be a $ZWRTACn<nnn> format */
SYNTAX_ERROR(ERR_DZWRNOALIAS);
if (TK_LPAREN == director_token)
{ /* Subscripted local variable - have alias container.
* The storing opcode set into the "put" triple at the top of this routine was
* set assuming the source was an alias. Now that we know the source is actually
* an alias container (and hence a different data type), we need to adjust the
* opcode accordingly.
*/
if (OC_SETALS2ALS == put->opcode)
put->opcode = OC_SETALSCTIN2ALS;
else
{
assert(OC_SETALSIN2ALSCT == put->opcode);
put->opcode = OC_SETALSCT2ALSCT;
}
}
/* For RHS processing, both alias var and alias container vars have their lv_val addr
* passed so normal var processing applies.
*/
if (!lvn(result, OC_GETINDX, 0))
SYNTAX_ERROR(ERR_ALIASEXPECTED);
}
}
if (first_setleft_invalid)
{ /* switch from the temporary chain back to the current execution chain */
assert(curtchain_switched);
RESTORE_CURTCHAIN_IF_NEEDED; /* does a setcurtchain(save_curtchain) */
targchain = save_targchain;
}
/* Now add in the left-hand side triples */
assert(!curtchain_switched);
obp = curtchain->exorder.bl;
dqadd(obp, &targchain, exorder); /* this is a violation of info hiding */
CHKTCHAIN(curtchain);
/* Check if "temp_subs" was FALSE originally but got set to TRUE as part of evaluating the right hand side
* (for example, if rhs had $$ or $& or $INCR usages). If so need to create temporaries.
*/
if (TREF(temp_subs) && temp_subs_was_FALSE && (NULL != sub))
m_set_create_temporaries(sub, put_oc);
TREF(temp_subs) = FALSE;
return TRUE;
}
/* This function adds triples to the execution chain to store the values of subscripts (in glvns in compound SETs)
* in temporaries (using OC_STOTEMP opcode). This function is only invoked when
* a) The SET is a compound SET (i.e. there are multiple targets specified on the left side of the SET command).
* b) Subscripts are specified in glvns which are targets of the SET.
* e.g. set a=0,(a,array(a))=1
* The expected result of the above command as per the M-standard is that array(0) (not array(1)) gets set to 1.
* That is, the value of the subscript "a" should be evaluated at the start of the compound SET before any sets happen
* and should be used in any subscripts that refer to the name "a".
* In the above example, since it is a compound SET and "a" is used in a subscript, we need to store the value of "a"
* before the start of the compound SET (i.e.a=0) in a temporary and use that as the subscript for "array".
* If in the above example the compound set was instead specified as set a=1,array(a)=1, the value of 1 gets substituted
* when used in "array(a)".
* This is where the compound set acts differently from a sequence of multiple sets. This is per the M-standard.
* In the above example, the subscript used was also a target within the compound SET. It is possible that the
* subscript is not also an individual target within the same compound SET. Even in that case, this function
* will be called to store the subscript in temporaries (as we dont know at compile time if a particular
* subscript is also used as a target within a compound SET).
*/
void m_set_create_temporaries(triple *sub, opctype put_oc)
{
oprtype *sb1;
triple *s0, *s1;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
assert(TREF(temp_subs));
assert(NULL != sub);
sb1 = &sub->operand[1];
if ((OC_GVNAME == put_oc) || (OC_PUTINDX == put_oc))
{
sub = sb1->oprval.tref; /* global name */
assert(sub->opcode == OC_PARAMETER);
sb1 = &sub->operand[1];
} else if (OC_GVEXTNAM == put_oc)
{
sub = sb1->oprval.tref; /* first env */
assert(sub->opcode == OC_PARAMETER);
sb1 = &sub->operand[0];
assert(sb1->oprclass == TRIP_REF);
s0 = sb1->oprval.tref;
if ((OC_GETINDX == s0->opcode) || (OC_VAR == s0->opcode))
{
s1 = maketriple(OC_STOTEMP);
s1->operand[0] = *sb1;
*sb1 = put_tref(s1);
s0 = s0->exorder.fl;
dqins(s0->exorder.bl, exorder, s1);
}
sb1 = &sub->operand[1];
sub = sb1->oprval.tref; /* second env */
assert(sub->opcode == OC_PARAMETER);
sb1 = &sub->operand[0];
assert(sb1->oprclass == TRIP_REF);
s0 = sb1->oprval.tref;
if ((OC_GETINDX == s0->opcode) || (OC_VAR == s0->opcode))
{
s1 = maketriple(OC_STOTEMP);
s1->operand[0] = *sb1;
*sb1 = put_tref(s1);
s0 = s0->exorder.fl;
dqins(s0->exorder.bl, exorder, s1);
}
sb1 = &sub->operand[1];
sub = sb1->oprval.tref; /* global name */
assert(sub->opcode == OC_PARAMETER);
sb1 = &sub->operand[1];
}
while (sb1->oprclass)
{
assert(sb1->oprclass == TRIP_REF);
sub = sb1->oprval.tref;
assert(sub->opcode == OC_PARAMETER);
sb1 = &sub->operand[0];
assert(sb1->oprclass == TRIP_REF);
s0 = sb1->oprval.tref;
if ((OC_GETINDX == s0->opcode) || (OC_VAR == s0->opcode))
{
s1 = maketriple(OC_STOTEMP);
s1->operand[0] = *sb1;
*sb1 = put_tref(s1);
s0 = s0->exorder.fl;
dqins(s0->exorder.bl, exorder, s1);
}
sb1 = &sub->operand[1];
}
}
/* Prior to Alias support, the ZWRITE command was able to dump the entire local variable environment such that it could be
* reloaded by Xecuting the dumped lines. With the addition of Alias type variables, the output lines not only include the
* variable content but their alias associations as well. One aspect of this is the $ZWRTAC variable which is a temporary
* "variable" which we allow to hold the content of what would otherwise be "orphaned data" or data which has a container
* pointing to it but is not referenced by a base variable. During the reload operation, it is this orphaned data that is
* put into the $ZWRTAC environment. The first orphaned array is put into $ZWRTAC1(...), the second into $ZWRTAC2(..) and
* so on. Setting the $ZWRTAC variable itself to null (or to any value actually - null only is not enforced) causes all of
* the $ZWRTAC variables to be KILL *'d. The only syntactic allowances for using $ZWRTACxxx as an mident in GTM are in this
* SET statement. We do not support its use in any other statement type. This routine allows us to modify the tokens so that
* if the current token is a '$' and the next token is ZWRTACxxx, we can combine them into a single token and the parser
* need not be further modified.
*/
void allow_dzwrtac_as_mident(void)
{
char_ptr_t chrp, chrpmin, chrplast;
int movlen;
if (TK_DOLLAR != window_token)
return; /* Couldn't be $ZWRTACxxx without first $ */
if (TK_IDENT != director_token)
return; /* Couldn't be $ZWRTACxxx without token 2nd part */
if (STR_LIT_LEN("ZWRTAC") > director_ident.len)
return; /* Couldn't be $ZALAISxxx without sufficient length of name */
if (0 != MEMCMP_LIT(director_ident.addr, "ZWRTAC"))
return; /* Couldn't be $ZWRTACxxx without ZWRTAC as first part of token */
/* We need to shift the existing token over 1 byte to make room for insertion of the '$' prefix. Normally,
* we wouldn't want to do this as we are verifying but since if the verification fails the code path will
* raise an error and since the error does not use this token buffer, we are safe in migrating while
* we do the verification check. Saves us having to scan the line backwards via memmove() again below. So
* verify the token suffix is all numeric while we do our shift.
*/
movlen = (director_ident.len < MAX_MIDENT_LEN) ? director_ident.len : MAX_MIDENT_LEN - 1;
for (chrplast = director_ident.addr + movlen, chrp = chrplast - 1,
chrpmin = director_ident.addr + STR_LIT_LEN("ZWRTAC") - 1;
chrp > chrpmin;
--chrp, --chrplast)
{
if (!ISDIGIT_ASCII((int)*chrp))
return; /* Couldn't be $ZWRTACxxx without all numeric suffix (if exists) */
*chrplast = *chrp;
}
/* Verification (and shift) complete -- finish modifying director token */
MEMCPY_LIT(director_ident.addr, DOLLAR_ZWRTAC);
director_ident.len = movlen + 1;
/* Nnw forward the scan to pull director token values into window token for use by our caller */
advancewindow();
assert(TK_IDENT == window_token);
}
Reference in New Issue View Git Blame Copy Permalink