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/* macro.c - expand macros for assembler */
#include "syshead.h"
#include "const.h"
#include "type.h"
#include "globvar.h"
#include "scan.h"
#undef EXTERN
#define EXTERN
#include "macro.h"
/*
Enter macro: stack macro and get its parameters.
Parameters form a linked list of null-terminated strings of form
next:string. The first string is the macro number in 4 bytes.
*/
PUBLIC void entermac(symptr)
struct sym_s *symptr;
{
if (maclevel >= MAXMAC)
error(MACOV);
else if (macpar + 2 > macptop)
error(PAROV); /* no room for 0th param */
/* (2 structs to fit it!) */
else
{
char ch;
struct schain_s *param1;
register char *reglineptr;
register char *stringptr;
++maclevel;
(--macstak)->text = (char *) symptr->value_reg_or_op.value;
macstak->parameters = param1 = macpar;
param1->next = NUL_PTR;
*(stringptr = build_number(++macnum, 3, param1->string)) = 0;
macpar = (struct schain_s *) (stringptr + 1);
/* TODO: alignment */
getsym();
if (sym == EOLSYM)
return; /* no other params */
if (sym != LPAREN)
reglineptr = symname;
else
reglineptr = lineptr;
stringptr = macpar->string;
while (TRUE)
{
if (stringptr >= (char *) macptop)
{
symname = reglineptr;
error(PAROV);
return;
}
ch = *reglineptr++;
if (ch == '\\')
/* escaped means no special meaning for slash, comma, paren */
ch = *reglineptr++;
else if (ch == ',' || ch == ')' || ch == '!' || ch == ';'
|| ch == '\n' || ch == 0)
{
if (stringptr >= (char *) macptop)
{
symname = reglineptr;
error(PAROV); /* no room for null */
return;
}
*stringptr = 0;
param1->next = macpar; /* ptr from previous */
(param1 = macpar)->next = NUL_PTR;
/* this goes nowhere */
macpar = (struct schain_s *) (stringptr + 1);
/* but is finished OK - TODO align */
stringptr = macpar->string;
if (ch != ',')
return;
continue;
}
if ((*stringptr++ = ch) == 0)
{
symname = reglineptr;
error(RPEXP);
return;
}
}
}
}
/* MACRO pseudo-op */
PUBLIC void pmacro()
{
bool_t saving;
bool_t savingc;
struct sym_s *symptr=0;
int maclen = 8;
int macoff = 0;
char * macbuf = asalloc(8);
saving = /* prepare for bad macro */
savingc = FALSE; /* normally don't save comments */
macload = TRUE; /* show loading */
if (label != NUL_PTR)
error(ILLAB);
else if (sym != IDENT)
error(LABEXP);
else
{
symptr = gsymptr;
if (symptr->type & MNREGBIT)
error(LABEXP);
else if (symptr->type & LABIT || symptr->data & FORBIT)
error(RELAB);
else if (pass != last_pass || symptr->type & REDBIT)
/* copy on pass 0, also pass 1 if redefined */
{
saving = TRUE;
if (symptr->type & MACBIT)
symptr->type |= REDBIT;
else
symptr->type |= MACBIT;
symptr->data = UNDBIT; /* undefined till end */
symptr->value_reg_or_op.value = (offset_t) macbuf;
getsym_nolookup(); /* test for "C" */
if (sym == IDENT && lineptr == symname + 1 && *symname == 'C')
savingc = TRUE;
}
}
while (TRUE)
{
skipline();
listline();
readline();
if (!macload)
break; /* macload cleared to show eof */
getsym_nolookup();
if (sym == IDENT)
{
if (lineptr == symname + 4 &&
( strncmp(symname, "MEND", 4) == 0 || strncmp(symname, "mend", 4) == 0) )
{
getsym();
break;
}
}
else if (sym != MACROARG)
{
if (!savingc)
continue; /* don't save comment */
}
if (!saving)
continue;
{
char * p = strchr(linebuf, EOLCHAR);
int len = (p-linebuf+1);
if ( macoff + len > maclen-4 )
{
maclen = maclen * 2 + len;
macbuf = asrealloc(macbuf, maclen);
}
memcpy(macbuf+macoff, linebuf, len);
macoff += len;
}
}
macload = FALSE;
if (saving)
{
macbuf[macoff] = ETB;
symptr->value_reg_or_op.value = (offset_t) macbuf;
symptr->data = 0;
}
}
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