520 lines
12 KiB
C
520 lines
12 KiB
C
/* I N T E R M E D I A T E C O D E
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*
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* I C . C
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*/
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#include <stdio.h>
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#include "../share/types.h"
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#include "../share/debug.h"
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#include "../share/def.h"
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#include "../share/map.h"
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#include "../../../h/em_spec.h"
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#include "../../../h/em_pseu.h"
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#include "../../../h/em_flag.h"
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#include "../../../h/em_mes.h"
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#include "ic.h"
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#include "ic_lookup.h"
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#include "ic_aux.h"
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#include "ic_io.h"
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#include "ic_lib.h"
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#include "../share/alloc.h"
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#include "../share/global.h"
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#include "../share/files.h"
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#include "../share/put.h"
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#include "../share/aux.h"
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/* Global variables */
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dblock_p db;
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dblock_p curhol = (dblock_p) 0; /* hol block in current scope */
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dblock_p ldblock; /* last dblock */
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proc_p lproc; /* last proc */
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short tabval; /* used by table1, table2 and table3 */
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offset tabval2;
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char string[IDL+1];
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line_p firstline; /* first line of current procedure */
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line_p lastline; /* last line read */
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int labelcount; /* # labels in current procedure */
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short fragm_type = DUNKNOWN; /* fragm. type: DCON, DROM or DUNKNOWN */
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short fragm_nr = 0; /* fragment number */
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obj_id lastoid = 0;
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proc_id lastpid = 0;
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dblock_id lastdid = 0;
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lab_id lastlid = 0;
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offset mespar = UNKNOWN_SIZE;
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/* argumument of ps_par message of current procedure */
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extern process_lines();
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extern int readline();
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extern line_p readoperand();
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extern line_p inpseudo();
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main(argc,argv)
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int argc;
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char *argv[];
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{
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/* The input files must be legal EM Compact
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* Assembly Language files, as produced by the EM Peephole
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* Optimizer.
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* Their file names are passed as arguments.
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* The output consists of the files:
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* - lfile: the EM code in Intermediate Code format
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* - dfile: the data block table file
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* - pfile: the proc table file
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* - pdump: the names of all procedures
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* - ddump: the names of all data blocks
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*/
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FILE *lfile, *dfile, *pfile, *pdump, *ddump;
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lfile = openfile(lname2,"w");
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pdump = openfile(argv[1],"w");
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ddump = openfile(argv[2],"w");
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while (next_file(argc,argv) != NULL) {
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/* Read all EM input files, process the code
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* and concatenate all output.
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*/
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process_lines(lfile);
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dump_procnames(prochash,NPROCHASH,pdump);
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dump_dblocknames(symhash,NSYMHASH,ddump);
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/* Save the names of all procedures that were
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* first come accross in this file.
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*/
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cleanprocs(prochash,NPROCHASH,PF_EXTERNAL);
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cleandblocks(symhash,NSYMHASH,DF_EXTERNAL);
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/* Make all procedure names that were internal
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* in this input file invisible.
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*/
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}
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fclose(lfile);
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fclose(pdump);
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fclose(ddump);
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/* remove the remainder of the hashing tables */
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cleanprocs(prochash,NPROCHASH,0);
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cleandblocks(symhash,NSYMHASH,0);
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/* Now write the datablock table and the proctable */
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dfile = openfile(dname2,"w");
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putdtable(fdblock, dfile);
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pfile = openfile(pname2,"w");
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putptable(fproc, pfile,FALSE);
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}
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/* Value returned by readline */
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#define NORMAL 0
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#define WITH_OPERAND 1
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#define EOFILE 2
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#define PRO_INSTR 3
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#define END_INSTR 4
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#define DELETED_INSTR 5
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STATIC add_end()
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{
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/* Add an end-pseudo to the current instruction list */
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lastline->l_next = newline(OPNO);
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lastline = lastline->l_next;
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lastline->l_instr = ps_end;
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}
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process_lines(fout)
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FILE *fout;
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{
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line_p lnp;
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short instr;
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bool eof;
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/* Read and process the code contained in the current file,
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* on a per procedure basis.
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* On the fly, fragments are formed. Recall that two
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* successive CON pseudos are allocated consecutively
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* in a single fragment, unless these CON pseudos are
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* separated in the assembly language program by one
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* of: ROM, BSS, HOL and END (and of course EndOfFile).
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* The same is true for ROM pseudos.
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* We keep track of a fragment type (DROM after a ROM
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* pseudo, DCON after a CON and DUNKNOWN after a HOL,
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* BSS, END or EndOfFile) and a fragment number (which
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* is incremented every time we enter a new fragment).
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* Every data block is assigned such a number
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* when we come accross its defining occurrence.
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*/
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eof = FALSE;
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firstline = (line_p) 0;
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lastline = (line_p) 0;
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while (!eof) {
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linecount++; /* for error messages */
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switch(readline(&instr, &lnp)) {
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/* read one line, see what kind it is */
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case WITH_OPERAND:
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/* instruction with operand, e.g. LOL 10 */
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lnp = readoperand(instr);
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lnp->l_instr = instr;
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/* Fall through! */
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case NORMAL:
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VL(lnp);
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if (lastline != (line_p) 0) {
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lastline->l_next = lnp;
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}
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lastline = lnp;
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break;
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case EOFILE:
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eof = TRUE;
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fragm_type = DUNKNOWN;
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if (firstline != (line_p) 0) {
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add_end();
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putlines(firstline,fout);
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firstline = (line_p) 0;
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}
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break;
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case PRO_INSTR:
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VL(lnp);
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labelcount = 0;
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if (firstline != lnp) {
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/* If PRO is not the first
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* instruction:
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*/
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add_end();
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putlines(firstline,fout);
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firstline = lnp;
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}
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lastline = lnp;
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break;
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case END_INSTR:
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curproc->p_nrformals = mespar;
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mespar = UNKNOWN_SIZE;
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assert(lastline != (line_p) 0);
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lastline->l_next = lnp;
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putlines(firstline,fout);
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/* write and delete code */
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firstline = (line_p) 0;
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lastline = (line_p) 0;
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cleaninstrlabs();
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/* scope of instruction labels ends here,
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* so forget about them.
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*/
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fragm_type = DUNKNOWN;
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break;
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case DELETED_INSTR:
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/* EXP, INA etc. are deleted */
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break;
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default:
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error("illegal readline");
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}
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}
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}
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int readline(instr_out, lnp_out)
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short *instr_out;
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line_p *lnp_out;
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{
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register line_p lnp;
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short n;
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/* Read one line. If it is a normal EM instruction without
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* operand, we can allocate a line struct for it here.
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* If so, return a pointer to it via lnp_out, else just
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* return the instruction code via instr_out.
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*/
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VA((short *) instr_out);
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VA((short *) lnp_out);
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switch(table1()) {
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/* table1 sets string, tabval or tabval2 and
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* returns an indication of what was read.
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*/
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case ATEOF:
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return EOFILE;
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case INST:
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*instr_out = tabval; /* instruction code */
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return WITH_OPERAND;
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case DLBX:
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/* data label defining occurrence, precedes
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* a data block.
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*/
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db = block_of_lab(string);
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/* global variable, used by inpseudo */
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lnp = newline(OPSHORT);
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SHORT(lnp) = (short) db->d_id;
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lnp->l_instr = ps_sym;
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*lnp_out = lnp;
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if (firstline == (line_p) 0) {
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firstline = lnp;
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/* only a pseudo (e.g. PRO) or data label
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* can be the first instruction.
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*/
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}
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return NORMAL;
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case ILBX:
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/* instruction label defining occurrence */
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labelcount++;
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lnp = newline(OPINSTRLAB);
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lnp->l_instr = op_lab;
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INSTRLAB(lnp) = instr_lab(tabval);
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*lnp_out = lnp;
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return NORMAL;
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case PSEU:
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n = tabval;
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lnp = inpseudo(n); /* read a pseudo */
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if (lnp == (line_p) 0) return DELETED_INSTR;
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*lnp_out = lnp;
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lnp->l_instr = n;
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if (firstline == (line_p) 0) {
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firstline = lnp;
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/* only a pseudo (e.g. PRO) or data label
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* can be the first instruction.
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*/
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}
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if (n == ps_end) return END_INSTR;
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if (n == ps_pro) return PRO_INSTR;
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return NORMAL;
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}
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/* NOTREACHED */
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}
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line_p readoperand(instr)
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short instr;
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{
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/* Read the operand of the given instruction.
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* Create a line struct and return a pointer to it.
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*/
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register line_p lnp;
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short flag;
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VI(instr);
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flag = em_flag[ instr - sp_fmnem] & EM_PAR;
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if (flag == PAR_NO) {
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return (newline(OPNO));
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}
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switch(table2()) {
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case sp_cend:
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return(newline(OPNO));
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case CSTX1:
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/* constant */
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/* If the instruction has the address
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* of an external variable as argument,
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* the constant must be regarded as an
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* offset in the current hol block,
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* so an object must be created.
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* Similarly, the instruction may have
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* an instruction label as argument.
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*/
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switch(flag) {
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case PAR_G:
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lnp = newline(OPOBJECT);
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OBJ(lnp) =
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object((char *) 0,(offset) tabval,
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opr_size(instr));
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break;
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case PAR_B:
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lnp = newline(OPINSTRLAB);
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INSTRLAB(lnp) = instr_lab(tabval);
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break;
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default:
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lnp = newline(OPSHORT);
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SHORT(lnp) = tabval;
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break;
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}
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break;
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#ifdef LONGOFF
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case CSTX2:
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/* double constant */
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lnp = newline(OPOFFSET);
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OFFSET(lnp) = tabval2;
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break;
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#endif
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case ILBX:
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/* applied occurrence instruction label */
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lnp = newline(OPINSTRLAB);
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INSTRLAB(lnp) = instr_lab(tabval);
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break;
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case DLBX:
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/* applied occurrence data label */
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lnp = newline(OPOBJECT);
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OBJ(lnp) = object(string, (offset) 0,
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opr_size(instr) );
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break;
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case VALX1:
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lnp = newline(OPOBJECT);
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OBJ(lnp) = object(string, (offset) tabval,
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opr_size(instr) );
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break;
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#ifdef LONGOFF
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case VALX2:
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lnp = newline(OPOBJECT);
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OBJ(lnp) = object(string,tabval2,
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opr_size(instr) );
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break;
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#endif
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case sp_pnam:
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lnp = newline(OPPROC);
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PROC(lnp) = proclookup(string,OCCURRING);
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VP(PROC(lnp));
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break;
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default:
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assert(FALSE);
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}
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return lnp;
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}
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line_p inpseudo(n)
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short n;
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{
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int m;
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line_p lnp;
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byte pseu;
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short nlast;
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/* Read the (remainder of) a pseudo instruction, the instruction
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* code of which is n. The END pseudo may be deleted (return 0).
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* The pseudos INA, EXA, INP and EXP (visibility pseudos) must
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* also be deleted, although the effects they have on the
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* visibility of global names and procedure names must first
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* be recorded in the datablock or procedure table.
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*/
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switch(n) {
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case ps_hol:
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case ps_bss:
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case ps_rom:
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case ps_con:
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if (lastline == (line_p) 0 || !is_datalabel(lastline)) {
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if (n == ps_hol) {
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/* A HOL need not be preceded
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* by a label.
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*/
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curhol = db = block_of_lab((char *) 0);
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} else {
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assert(lastline != (line_p) 0);
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nlast = INSTR(lastline);
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if (n == nlast &&
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(n == ps_rom || n == ps_con)) {
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/* Two successive roms/cons are
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* combined into one data block
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* if the second is not preceded by
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* a data label.
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*/
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lnp = arglist(0);
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pseu = (byte) (n == ps_rom?DROM:DCON);
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combine(db,lastline,lnp,pseu);
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oldline(lnp);
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return (line_p) 0;
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} else {
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error("datablock without label");
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}
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}
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}
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VD(db);
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m = (n == ps_hol || n == ps_bss ? 3 : 0);
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lnp = arglist(m);
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/* Read the arguments, 3 for hol or bss and a list
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* of undetermined length for rom and con.
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*/
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dblockdef(db,n,lnp);
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/* Fill in d_pseudo, d_size and d_values fields of db */
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if (fragm_type != db->d_pseudo & BMASK) {
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/* Keep track of fragment numbers,
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* enter a new fragment.
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*/
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fragm_nr++;
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switch(db->d_pseudo) {
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case DCON:
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case DROM:
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fragm_type = db->d_pseudo;
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break;
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default:
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fragm_type = DUNKNOWN;
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break;
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}
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}
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db->d_fragmnr = fragm_nr;
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return lnp;
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case ps_ina:
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getsym(DEFINING);
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/* Read and lookup a symbol. As this must be
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* the first occurrence of the symbol and we
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* say it's a defining occurrence, getsym will
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* automatically make it internal (according to
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* the EM visibility rules).
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* The result (a dblock pointer) is voided.
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*/
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return (line_p) 0;
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case ps_inp:
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getproc(DEFINING); /* same idea */
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return (line_p) 0;
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case ps_exa:
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getsym(OCCURRING);
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return (line_p) 0;
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case ps_exp:
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getproc(OCCURRING);
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return (line_p) 0;
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case ps_pro:
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curproc = getproc(DEFINING);
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/* This is a real defining occurrence of a proc */
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curproc->p_localbytes = get_off();
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curproc->p_flags1 |= PF_BODYSEEN;
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/* Record the fact that we came accross
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* the body of this procedure.
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*/
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lnp = newline(OPPROC);
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PROC(lnp) = curproc;
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lnp->l_instr = (byte) ps_pro;
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return lnp;
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case ps_end:
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curproc->p_nrlabels = labelcount;
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lnp = newline(OPNO);
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get_off();
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/* Void # localbytes, which we already know
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* from the PRO instruction.
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*/
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return lnp;
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case ps_mes:
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lnp = arglist(0);
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switch((int) aoff(ARG(lnp),0)) {
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case ms_err:
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error("ms_err encountered");
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case ms_opt:
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error("ms_opt encountered");
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case ms_emx:
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ws = aoff(ARG(lnp),1);
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ps = aoff(ARG(lnp),2);
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break;
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case ms_ext:
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/* this message was already processed
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* by the lib package
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*/
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case ms_src:
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/* Don't bother about linecounts */
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oldline(lnp);
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return (line_p) 0;
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case ms_par:
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mespar = aoff(ARG(lnp),1);
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/* #bytes of parameters of current proc */
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break;
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}
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return lnp;
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default:
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assert(FALSE);
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}
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/* NOTREACHED */
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}
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