GEXPR386.C
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上传日期:2007-01-06
资源大小:220k
文件大小:86k
- /*
- * 68K/386 32-bit C compiler.
- *
- * copyright (c) 1997, David Lindauer
- *
- * This compiler is intended for educational use. It may not be used
- * for profit without the express written consent of the author.
- *
- * It may be freely redistributed, as long as this notice remains intact
- * and either the original sources or derived sources
- * are distributed along with any executables derived from the originals.
- *
- * The author is not responsible for any damages that may arise from use
- * of this software, either idirect or consequential.
- *
- * v1.35 March 1997
- * David Lindauer, gclind01@starbase.spd.louisville.edu
- *
- * Credits to Mathew Brandt for original K&R C compiler
- *
- */
- #include <stdio.h>
- #include "expr.h"
- #include "c.h"
- #include "gen386.h"
- #include "diag.h"
- /*
- * this module contains all of the code generation routines
- * for evaluating expressions and conditions.
- */
- extern int stdinttype,stdunstype,stdintsize, stdldoublesize,stdaddrsize;
- extern int stackadd,stackmod;
- extern int prm_largedata, prm_linkreg;
- extern AMODE push[], pop[];
- extern int prm_68020;
- extern long framedepth, stackdepth;
- extern int regs[3];
- extern long nextlabel;
- extern long lc_maxauto;
- extern char regstack[],rsold[],rsodepth,rsdepth;
- AMODE freg0[] = { { am_freg, 0 } };
- AMODE sreg[] = { { am_dreg,4 } };
- long bittab[32] = { 1,0x3,0x7,0xf,0x1f,0x3f,0x7f,0xff,
- 0x1ff,0x3ff,0x7ff,0xfff,0x1fff,0x3fff,0x7fff,0xffff,
- 0x1ffffL,0x3ffffL,0x7ffffL,0xfffffL,0x1fffffL,0x3fffffL,0x7fffffL,0xffffffL,
- 0x1ffffffL,0x3ffffffL,0x7ffffffL,0xfffffffL,0x1fffffffL,0x3fffffffL,0x7fffffffL,0xffffffffL
- };
- void gen_f10code(int op, int size, AMODE *ap1, AMODE *ap2)
- {
- if (size != 10)
- gen_code(op,size,ap1,ap2);
- else {
- gen_code(op_fld,size,ap1,ap2);
- gen_code(op,size,0,0);
- }
- }
- int chksize(int lsize, int rsize)
- {
- int l,r;
- l = lsize;
- r = rsize;
- if (l < 0) l = - l;
- if (r < 0) r = - r;
- return(l > r);
- }
- AMODE *fstack(void)
- {
- AMODE *ap = xalloc(sizeof(AMODE));
- ap->mode = am_freg;
- ap->preg = 0;
- ap->sreg = 0;
- ap->offset = 0;
- ap->tempflag = TRUE;
- return(ap);
- }
- AMODE *make_muldivval(AMODE *ap)
- {
- int temp;
- AMODE *ap1 = make_label(temp = nextlabel++);
- queue_muldivval(temp,ap->offset->v.i);
- ap1->mode = am_direct;
- return(ap1);
- }
- void make_floatconst(AMODE *ap, int size)
- {
- int temp;
- AMODE *ap1 = make_label(temp = nextlabel++);
- if (isintconst(ap->offset->nodetype))
- ap->offset->v.f = ap->offset->v.i;
- queue_floatval(temp,ap->offset->v.f,size);
- ap->mode = am_direct;
- ap->length = 8;
- ap->offset = ap1->offset;
- }
- AMODE *make_label(int lab)
- /*
- * construct a reference node for an internal label number.
- */
- { ENODE *lnode;
- AMODE *ap;
- lnode = xalloc(sizeof(ENODE));
- lnode->nodetype = en_labcon;
- lnode->v.i = lab;
- ap = xalloc(sizeof(AMODE));
- ap->mode = am_immed;
- ap->offset = lnode;
- return ap;
- }
- AMODE *make_immed(long i)
- /*
- * make a node to reference an immediate value i.
- */
- { AMODE *ap;
- ENODE *ep;
- ep = xalloc(sizeof(ENODE));
- ep->nodetype = en_icon;
- ep->v.i = i;
- ap = xalloc(sizeof(AMODE));
- ap->mode = am_immed;
- ap->offset = ep;
- return ap;
- }
- AMODE *make_immedt(long i, int size)
- /*
- * make a node to reference an immediate value i.
- */
- {
- switch (size) {
- case 1:
- case -1:
- i &= 0xff;
- break;
- case 2:
- case -2:
- i &= 0xffff;
- break;
- }
- return make_immed(i);
- }
- AMODE *make_offset(ENODE *node)
- /*
- * make a direct reference to a node.
- */
- { AMODE *ap;
- ap = xalloc(sizeof(AMODE));
- ap->mode = am_direct;
- ap->offset = node;
- return ap;
- }
- AMODE *make_stack(int number)
- {
- AMODE *ap = xalloc(sizeof(AMODE));
- ENODE *ep = xalloc(sizeof(ENODE));
- ep->nodetype = en_icon;
- ep->v.i = -number;
- ap->mode = am_indisp;
- ap->preg = ESP;
- ap->offset = ep;
- return(ap);
- }
- void make_legal(AMODE *ap,int flags,int size)
- /*
- * make_legal will coerce the addressing mode in ap1 into a
- * mode that is satisfactory for the flag word.
- */
- { AMODE *ap2,*ap1;
- if( ((flags & F_VOL) == 0) || ap->tempflag )
- {
- switch( ap->mode )
- {
- case am_freg:
- if (flags & F_FREG && size > 4)
- return;
- break;
- case am_immed:
- if (size > 4) {
- make_floatconst(ap,size);
- if (flags & F_MEM)
- return;
- }
- else
- if( flags & F_IMMED )
- return; /* mode ok */
-
- break;
- case am_dreg:
- if( flags & F_DREG) {
- return;
- }
- break;
- case am_indisp: case am_indispscale:
- case am_direct:
- if (flags & F_INDX)
- return;
- if( flags & F_MEM)
- return;
- break;
- }
- }
- if (!(flags & F_DREG)) {
- if (flags & F_FREG && ap->mode != am_freg && !(flags & F_MEM)) {
- freeop(ap);
- if (size <=4)
- if (size == 1 || size == -1) {
- ap1 = temp_data();
- if (size < 0)
- gen_code2(op_movsx,4,1,ap1,ap);
- else
- gen_code2(op_movzx,4,1,ap1,ap);
- gen_code(op_push,4,ap1,0);
- gen_code(op_fild,2,make_stack(0),0);
- gen_code(op_add,4,sreg,make_immed(4));
- freeop(ap1);
- }
- else
- gen_code(op_fild,size,ap,0);
- else
- gen_code(op_fld,size,ap,0);
- ap->mode = am_freg;
- ap->preg = 0;
- return;
- }
- }
- else if (size > 4) {
- freeop(ap);
- gen_code(op_fld,size,ap,0);
- if (flags & F_FREG) {
- ap->mode = am_freg;
- ap->preg = 0;
- return;
- }
- else {
- gen_code(op_push,4,makedreg(3),0);
- gen_code(op_fistp,4,make_stack(0),0);
- ap1 = temp_data();
- gen_code(op_pop,4,ap1,make_stack(0));
- ap->mode = ap1->mode;
- ap->preg = ap1->preg;
- return;
- }
- }
- if( size == -1 )
- {
- freeop(ap);
- ap2 = temp_data();
- if (ap->mode == am_immed)
- gen_code(op_mov,1,ap2,ap);
- else if (ap->mode == am_dreg && ap->preg > 3)
- gen_code(op_mov,4,ap2,ap);
- else
- gen_code2(op_movsx,4,1,ap2,ap);
- ap->mode = ap2->mode;
- ap->preg = ap2->preg;
- ap->tempflag = TRUE;
- size = -2;
- }
-
- else if( size == 1 )
- {
- freeop(ap);
- ap2 = temp_data();
- if (ap->mode == am_immed)
- gen_code(op_mov,1,ap2,ap);
- else if (ap->mode == am_dreg && ap->preg > 3)
- gen_code(op_mov,4,ap2,ap);
- else
- gen_code2(op_movzx,4,1,ap2,ap);
- ap->mode = ap2->mode;
- ap->preg = ap2->preg;
- ap->tempflag = TRUE;
- size = 2;
- }
- else if( size == -2 )
- {
- freeop(ap);
- ap2 = temp_data();
- if (ap->mode == am_immed)
- gen_code(op_mov,2,ap2,ap);
- else if (ap->mode == am_dreg && ap->preg > 3)
- gen_code(op_mov,4,ap2,ap);
- else
- gen_code2(op_movsx,4,2,ap2,ap);
- ap->mode = ap2->mode;
- ap->preg = ap2->preg;
- ap->tempflag = TRUE;
- size = -4;
- }
-
- else if( size == 2 )
- {
- freeop(ap);
- ap2 = temp_data();
- if (ap->mode == am_immed)
- gen_code(op_mov,2,ap2,ap);
- else if (ap->mode == am_dreg && ap->preg > 3)
- gen_code(op_mov,4,ap2,ap);
- else
- gen_code2(op_movzx,4,2,ap2,ap);
- ap->mode = ap2->mode;
- ap->preg = ap2->preg;
- ap->tempflag = TRUE;
- size = 4;
- }
- else if (size == 4 || size == -4) {
- freeop(ap);
- ap2 = temp_data();
- gen_code(op_mov,size,ap2,ap);
- ap->mode = am_dreg;
- ap->preg = ap2->preg;
- ap->tempflag = 1;
- }
- }
- void bit_legal(AMODE *ap,ENODE *node, int size)
- {
- if (node->bits != -1) {
- make_legal(ap,F_DREG | F_VOL,size);
- if (node->startbit)
- gen_code(op_shr,size,ap,make_immed(node->startbit));
- gen_code(op_and,4,ap,make_immed(bittab[node->bits-1]));
- }
- }
- AMODE *get_bitval(AMODE *ap,ENODE *node, int size)
- {
- AMODE *ap1 = temp_data();
- ap1->tempflag = TRUE;
- gen_code(op_mov,size,ap1,ap);
- if (node->startbit)
- gen_code(op_shr,size,ap1,make_immed(node->startbit));
- gen_code(op_and,4,ap1,make_immed(bittab[node->bits-1]));
- return ap1;
- }
- void bit_move(AMODE *ap2, AMODE *ap1, ENODE *node, int flags, int sizein, int sizeout)
- {
- gen_code(op_and,sizeout,ap2,make_immed(~(bittab[node->bits-1]<<node->startbit)));
- if (ap1->mode == am_immed) {
- ap1->offset->v.i &= bittab[node->bits-1];
- if (ap1->offset->v.i) {
- ap1->offset->v.i <<= node->startbit;
- gen_code(op_or,sizeout,ap2,ap1);
- if (!(flags & F_NOVALUE)) {
- make_legal(ap2,flags,sizeout);
- ap1->offset->v.i >>= node->startbit;
- gen_code(op_mov,sizeout,ap2,ap1);
- }
- }
- }
- else {
- make_legal(ap1,F_DREG | F_VOL,sizein);
- gen_code(op_and,sizein,ap1,make_immed(bittab[node->bits-1]));
- if (node->startbit)
- gen_code(op_shl,sizein,ap1,make_immed(node->startbit));
- gen_code(op_or,sizeout,ap2,ap1);
- if (!(flags & F_NOVALUE)) {
- if (node->startbit)
- gen_code(op_shr,sizein,ap1,make_immed(node->startbit));
- }
- }
- }
- void do_extend(AMODE *ap,int isize,int osize,int flags)
- /*
- * if isize is not equal to osize then the operand ap will be
- * loaded into a register (if not already) and if osize is
- * greater than isize it will be extended to match.
- */
- { AMODE *ap2;
- if (isize == 0)
- return;
- if( isize == osize || isize == -osize)
- return;
- if( ap->mode != am_dreg && osize <=4) {
- if (flags & F_DEST)
- make_legal(ap,flags,isize);
- else
- make_legal(ap,F_DREG | F_FREG,isize);
- if (flags & F_DEST)
- return;
- if (chksize(osize,isize))
- return;
- }
- switch(isize)
- {
- doextend:
- case -1:
- case 1:
- case -2:
- case 2:
- if (osize < isize) {
- gen_code2(op_movsx,osize,isize,ap,ap);
- }
- else if (osize <=4 && osize > isize) {
- gen_code2(op_movzx,osize,isize,ap,ap);
- }
- case 4:
- case -4:
- do4:
- if (osize <= 4)
- return;
- else {
- if (ap->mode != am_freg) {
- do_extend(ap,isize,4,F_ALL | F_VOL);
- ap2 = make_stack(0);
- gen_code(op_push,4,ap,0);
- freeop(ap);
- gen_codef(op_fild,4,ap2,0);
- gen_code(op_add,4,sreg,make_immed(4));
- freeop(ap);
- }
- ap->mode = am_freg;
- ap->preg = 0;
- ap->tempflag = TRUE;
- }
- break;
- case 6:
- case 8:
- if (osize > isize) {
- if (ap->mode != am_freg) {
- gen_codef(op_fld,osize,ap,0);
- freeop(ap);
- ap->mode = am_freg;
- ap->preg = 0;
- ap->tempflag = TRUE;
- }
- return;
- }
-
- case 10:
- if (ap->mode != am_freg) {
- freeop(ap);
- gen_codef(op_fld,isize,ap,0);
- ap->mode = am_freg;
- ap->preg = 0;
- ap->tempflag = TRUE;
- }
- switch(osize) {
- case 1:
- case -1:
- case 2:
- case -2:
- case 4:
- case -4:
- freeop(ap);
- ap2 = temp_data();
- ap->mode = ap2->mode;
- ap->preg = ap2->preg;
- gen_code(op_push,4,makedreg(3),0);
- gen_codef(op_fistp,4,ap2 = make_stack(0),0);
- gen_codef(op_fwait,0,0,0);
- gen_code(op_mov,osize,ap,ap2);
- gen_code(op_add,4,sreg,make_immed(4));
- goto doextend;
- case 6:
- case 8:
- break;
- }
- }
- }
- int isshort(ENODE *node)
- /*
- * return true if the node passed can be generated as a short
- * offset.
- */
- { return (isintconst(node->nodetype) &&
- (node->v.i >= -32768L && node->v.i <= 32767L));
- }
- int isbyte(ENODE *node)
- /*
- * return true if the node passed can be evaluated as a byte
- * offset.
- */
- { return isintconst(node->nodetype) &&
- (-128 <= node->v.i && node->v.i <= 127);
- }
- AMODE *gen_index(ENODE *node)
- /*
- * generate code to evaluate an index node (^+) and return
- * the addressing mode of the result. This routine takes no
- * flags since it always returns either am_ind or am_indx.
- */
- { AMODE *ap1,*ap2, *ap, *ap3;
- ENODE node2;
- int scale;
- switch (node->v.p[0]->nodetype) {
- case en_icon:
- ap1 = gen_expr(node->v.p[0],F_IMMED,4);
- break;
- case en_lsh:
- if ((scale = node->v.p[0]->v.p[1]->v.i) < 4 && scale) {
- ap1 = gen_expr(node->v.p[0]->v.p[0],F_IMMED | F_DREG,4);
- if (ap1->mode == am_immed) {
- while (--scale)
- ap1->offset->v.i <<=1;
- }
- else {
- ap1->mode = am_indispscale;
- ap1->sreg = ap1->preg;
- ap1->preg = -1;
- ap1->scale = scale;
- ap1->offset = makenode(en_icon,0,0);
- }
- break;
- }
- default:
- mark();
- ap1 = gen_deref(node,F_MEM | F_DREG,4);
- switch (ap1->mode) {
- default:
- rsold[rsodepth-1] = rsdepth;
- break;
- case am_indispscale:
- if (ap1->sreg >=0 && ap1->preg >= 0) {
- int t = rsold[rsodepth-1];
- freeop(ap1);
- ap3 = temp_data();
- gen_code(op_lea,4,ap3,ap1);
- ap3->mode = am_indisp;
- ap3->offset = makenode(en_icon,0,0);
- if (t <rsdepth-1 && ap3->preg + 8 == regstack[t+1])
- t+=2;
- if (t <rsdepth && ap3->preg + 8 == regstack[t])
- t+=1;
- ap1 = ap3;
- }
-
- }
- release();
- break;
- }
- switch (node->v.p[1]->nodetype) {
- case en_icon:
- ap2 = gen_expr(node->v.p[1],F_IMMED,4);
- break;
- case en_lsh:
- if ((scale = node->v.p[1]->v.p[1]->v.i) < 4 && scale) {
- ap2 = gen_expr(node->v.p[1]->v.p[0],F_IMMED | F_DREG,4);
- if (ap2->mode == am_immed) {
- while (--scale)
- ap2->offset->v.i <<=1;
- }
- else {
- ap2->mode = am_indispscale;
- ap2->sreg = ap2->preg;
- ap2->preg = -1;
- ap2->scale = scale;
- ap2->offset = makenode(en_icon,0,0);
- }
- break;
- }
- default:
- node2.v.p[0] = node->v.p[1];
- node2.nodetype = node->nodetype;
- mark();
- ap2 = gen_deref(&node2,F_MEM | F_DREG,4);
- switch (ap1->mode) {
- default:
- rsold[rsodepth-1] = rsdepth;
- break;
- case am_indispscale:
- if (ap1->sreg >=0 && ap1->preg >= 0) {
- int t = rsold[rsodepth-1];
- freeop(ap1);
- ap3 = temp_data();
- gen_code(op_lea,4,ap3,ap1);
- ap3->mode = am_indisp;
- ap3->offset = makenode(en_icon,0,0);
- if (t <rsdepth-1 && ap3->preg + 8 == regstack[t+1])
- t+=2;
- if (t <rsdepth && ap3->preg + 8 == regstack[t])
- t+=1;
- ap1 = ap3;
- }
-
- }
- release();
- break;
- }
- switch(ap1->mode) {
- case am_dreg:
- switch (ap2->mode) {
- case am_dreg:
- ap1->sreg = ap2->preg;
- ap1->scale = 0;
- ap1->mode = am_indispscale;
- ap1->offset = makenode(en_icon,(char *)0,0);
- return ap1;
- case am_immed:
- case am_direct:
- ap2->preg = ap1->preg;
- ap2->mode = am_indisp;
- return ap2;
- case am_indisp:
- ap2->sreg = ap2->preg;
- ap2->preg = ap1->preg;
- ap2->mode = am_indispscale;
- ap2->offset = ap1->offset;
- ap2->scale = 0;
- return ap2;
- case am_indispscale:
- if (ap2->preg == -1) {
- ap2->preg = ap1->preg;
- return ap2;
- }
- freeop(ap2);
- ap = temp_data();
- gen_code(op_lea,4,ap,ap2);
- ap->sreg = ap1->preg;
- ap->mode = am_indispscale;
- ap->scale = 0;
- ap->offset = makenode(en_icon,0,0);
- return ap;
- }
- break;
- case am_direct:
- case am_immed:
- switch (ap2->mode) {
- case am_dreg:
- ap2->mode = am_indisp;
- ap2->offset = ap1->offset;
- return ap2;
- case am_immed:
- case am_direct:
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap1->offset->v.i += ap2->offset->v.i;
- else
- ap1->offset = makenode(en_add,ap1->offset,ap2->offset);
- ap1->mode = am_direct;
- return ap1;
- case am_indisp:
- case am_indispscale:
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap2->offset->v.i += ap1->offset->v.i;
- else
- ap2->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap2;
- }
- break;
- case am_indisp:
- switch (ap2->mode) {
- case am_dreg:
- ap1->mode = am_indispscale;
- ap1->sreg = ap2->preg;
- ap1->scale = 0;
- return ap1;
- case am_immed:
- case am_direct:
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap1->offset->v.i += ap2->offset->v.i;
- else
- ap1->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap1;
- case am_indisp:
- ap1->mode = am_indispscale;
- ap1->sreg = ap2->preg;
- ap1->scale = 0;
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap1->offset->v.i += ap2->offset->v.i;
- else
- ap1->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap1;
- case am_indispscale:
- if (ap2->preg == -1) {
- ap2->preg = ap1->preg;
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap2->offset->v.i += ap1->offset->v.i;
- else
- ap2->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap2;
- }
- freeop(ap2);
- ap = temp_data();
- gen_code(op_lea,4,ap,ap2);
- ap1->sreg = ap->preg;
- ap1->scale = 0;
- ap1->mode = am_indispscale;
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap1->offset->v.i += ap2->offset->v.i;
- else
- ap1->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap1;
- }
- break;
- case am_indispscale:
- switch (ap2->mode) {
- case am_dreg:
- if (ap1->preg == -1) {
- ap1->preg = ap2->preg;
- return ap1;
- }
- freeop(ap1);
- ap = temp_data();
- gen_code(op_lea,4,ap,ap1);
- ap->sreg = ap2->preg;
- ap->scale = 0;
- ap->offset = ap1->offset;
- return ap;
- case am_immed:
- case am_direct:
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap1->offset->v.i += ap2->offset->v.i;
- else
- ap1->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap1;
- case am_indisp:
- if (ap1->preg == -1) {
- ap1->preg = ap2->preg;
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap1->offset->v.i += ap2->offset->v.i;
- else
- ap1->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap1;
- }
- freeop(ap1);
- ap = temp_data();
- gen_code(op_lea,4,ap,ap1);
- ap->sreg = ap2->preg;
- ap->scale = 0;
- ap->mode = am_indispscale;
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap->offset->v.i = ap2->offset->v.i +ap1->offset->v.i;
- else
- ap->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap;
- case am_indispscale:
- if (ap1->preg == -1 && ap2->preg == -1) {
- if (ap1->scale == 0) {
- ap2->preg = ap1->sreg;
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap2->offset->v.i += ap1->offset->v.i;
- else
- ap2->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap2;
- } else if (ap2->scale == 0) {
- ap1->preg = ap2->sreg;
- if (ap1->offset->nodetype == en_icon && ap2->offset->nodetype == en_icon)
- ap1->offset->v.i += ap2->offset->v.i;
- else
- ap1->offset = makenode(en_add,ap1->offset,ap2->offset);
- return ap1;
- }
- }
- if (ap1->preg == -1) {
- freeop(ap2);
- ap = temp_data();
- gen_code(op_lea,4,ap,ap2);
- ap1->preg = ap->preg;
- return ap1;
- }
- else if (ap2->preg == -1) {
- freeop(ap1);
- ap = temp_data();
- gen_code(op_lea,4,ap,ap1);
- ap2->preg = ap->preg;
- return ap2;
- }
- freeop(ap1);
- ap = temp_data();
- gen_code(op_lea,4,ap,ap1);
- freeop(ap2);
- ap1 = temp_data();
- gen_code(op_lea,4,ap1,ap2);
- ap->mode = am_indispscale;
- ap->sreg = ap1->preg;
- ap->scale = 0;
- ap->offset = makenode(en_icon,0,0);
- return ap;
- }
- break;
- }
- DIAG("invalid index conversion");
- }
- AMODE *gen_deref(ENODE *node, int flags,int size)
- /*
- * return the addressing mode of a dereferenced node.
- */
- { AMODE *ap1;
- int ssize,psize;
- psize = size;
- if (psize < 0)
- psize = - psize;
- switch( node->nodetype ) /* get load size */
- {
- case en_ub_ref:
- ssize = 1;
- break;
- case en_b_ref:
- ssize = -1;
- break;
- case en_uw_ref:
- ssize = 2;
- break;
- case en_w_ref:
- ssize = -2;
- break;
- case en_l_ref:
- ssize = -4;
- break;
- case en_ul_ref:
- ssize = 4;
- break;
- case en_floatref:
- ssize = 6;
- break;
- case en_doubleref:
- ssize = 8;
- break;
- case en_longdoubleref:
- ssize = 10;
- break;
- default:
- ssize = 4;
- }
- if( node->v.p[0]->nodetype == en_add )
- {
- ap1 = gen_index(node->v.p[0]);
- do_extend(ap1,ssize,psize,flags);
- make_legal(ap1,flags,psize);
- return ap1;
- }
- else if( node->v.p[0]->nodetype == en_autocon || node->v.p[0]->nodetype == en_autoreg)
- {
- ap1 = xalloc(sizeof(AMODE));
- ap1->mode = am_indisp;
- ap1->preg = ESP;
- if (prm_linkreg) {
- ap1->preg = EBP;
- ap1->offset = makenode(en_icon,(char *)((SYM *)node->v.p[0]->v.p[0])->value.i,0);
- }
- else if (((SYM *)node->v.p[0]->v.p[0])->funcparm)
- ap1->offset = makenode(en_icon,(char *)(((SYM *)node->v.p[0]->v.p[0])->value.i+framedepth+stackdepth),0);
- else
- ap1->offset = makenode(en_icon,(char *)(((SYM *)node->v.p[0]->v.p[0])->value.i+stackdepth+lc_maxauto),0);
- do_extend(ap1,ssize,size,flags);
- make_legal(ap1,flags,psize);
- return ap1;
- }
- else if( node->v.p[0]->nodetype == en_nacon || node->v.p[0]->nodetype == en_napccon)
- {
- ap1 = xalloc(sizeof(AMODE));
- ap1->offset = makenode(node->v.p[0]->nodetype,(char *)((SYM *)node->v.p[0]->v.p[0])->name,0);
- ap1->mode = am_direct;
- do_extend(ap1,ssize,size,flags);
- make_legal(ap1,flags,psize);
- return ap1;
- }
- else if( node->v.p[0]->nodetype == en_nalabcon)
- {
- ap1 = xalloc(sizeof(AMODE));
- ap1->offset = makenode(node->v.p[0]->nodetype,(char *)node->v.p[0]->v.i,0);
- ap1->mode = am_direct;
- do_extend(ap1,ssize,size,flags);
- make_legal(ap1,flags,psize);
- return ap1;
- }
- else if( node->v.p[0]->nodetype == en_labcon)
- {
- ap1 = xalloc(sizeof(AMODE));
- ap1->mode = am_direct;
- ap1->offset = makenode(node->v.p[0]->nodetype,(char *)node->v.p[0]->v.i,0);
- do_extend(ap1,ssize,size,flags);
- make_legal(ap1,flags,psize);
- return ap1;
- }
- else if (node->v.p[0]->nodetype == en_absacon) {
- ap1 = xalloc(sizeof(AMODE));
- ap1->mode = am_direct;
- ap1->offset = makenode(en_absacon,(char *)((SYM *)node->v.p[0]->v.p[0])->value.i,0);
- do_extend(ap1,ssize,size,flags);
- make_legal(ap1,flags,psize);
- return ap1;
- }
- else if (node->v.p[0]->nodetype == en_regref) {
- ap1 = gen_expr(node->v.p[0],F_ALL,4);
- do_extend(ap1,ssize,size,flags);
- make_legal(ap1,flags,psize);
- return ap1;
- }
- ap1 = gen_expr(node->v.p[0],F_DREG | F_IMMED,4); /* generate address */
- if( ap1->mode == am_dreg )
- {
- ap1->mode = am_indisp;
- ap1->offset = makenode(en_icon,0,0);
- do_extend(ap1,ssize,size,flags);
- make_legal(ap1,flags,psize);
- return ap1;
- }
- ap1->mode = am_direct;
- do_extend(ap1,ssize,size,flags);
- make_legal(ap1,flags,psize);
- return ap1;
- }
- AMODE *gen_unary(ENODE *node,int flags,int size,int op, int fop)
- /*
- * generate code to evaluate a unary minus or complement.
- */
- { AMODE *ap;
- ap = gen_expr(node->v.p[0],F_FREG | F_DREG | F_VOL,size);
- if (ap->mode == am_freg) {
- gen_code(fop,0,0,0);
- ap = fstack();
- }
- else {
- gen_code(op,size,ap,0);
- }
- make_legal(ap,flags,size);
- return ap;
- }
- AMODE *gen_binary(ENODE *node,int flags,int size,int op, int fop)
- /*
- * generate code to evaluate a binary node and return
- * the addressing mode of the result.
- */
- { AMODE *ap1, *ap2;
- if (size > 4) {
- ap1 = gen_expr(node->v.p[0],F_VOL | F_FREG,size);
- mark();
- ap2 = gen_expr(node->v.p[1],F_MEM | F_FREG,size);
- if (ap2->mode == am_freg)
- gen_code(fop,0,0,0);
- else {
- int t;
- t = natural_size(node->v.p[1]);
- if (t== 0) t = size;
- if (t <=4)
- if (fop == op_fadd)
- fop = op_fiadd;
- else
- fop = op_fisub;
- gen_f10code(fop,t,ap2,0);
- }
- ap1 = fstack();
- }
- else {
- ap1 = gen_expr(node->v.p[0],F_VOL | F_DREG,size);
- mark();
- ap2 = gen_expr(node->v.p[1],F_ALL,size);
- gen_code(op,size,ap1,ap2);
- }
- freeop(ap2);
- release();
- make_legal(ap1,flags,size);
- return ap1;
- }
- AMODE *gen_xbin(ENODE *node,int flags,int size,int op, int fop)
- /*
- * generate code to evaluate a restricted binary node and return
- * the addressing mode of the result.
- */
- { AMODE *ap1, *ap2;
- if (size > 4) {
- ap1 = gen_expr(node->v.p[0],F_VOL | F_FREG,size);
- mark();
- ap2 = gen_expr(node->v.p[1],F_MEM | F_FREG,size);
- if (ap2->mode == am_freg)
- gen_code(fop,0,0,0);
- else
- gen_code(fop,size,ap2,0);
- ap1 = fstack();
- }
- else {
- ap1 = gen_expr(node->v.p[0],F_VOL | F_DREG,size);
- mark();
- ap2 = gen_expr(node->v.p[1],F_ALL,size);
- gen_code(op,size,ap2,ap1);
- }
- release();
- freeop(ap2);
- make_legal(ap1,flags,size);
- return ap1;
- }
- void doshift(AMODE *ap1, AMODE *ap2, int size, int op)
- { AMODE *ecx = makedreg(ECX), *eax = makedreg(EAX);
- if (ap2->mode == am_immed) {
- gen_code2(op,size,1,ap1,ap2);
- }
- else
- if (ap1->mode == am_dreg && ap1->preg == ECX) {
- if (ap2->mode == am_dreg) {
- gen_code(op_xchg,4,ap2,ap1);
- gen_code2(op,size,1,ap2,ecx);
- gen_code(op_xchg,4,ap2,ap1);
- }
- else {
- if (regs[0])
- gen_push(EAX,am_dreg,0);
- gen_code(op_xchg,4,eax,ecx);
- gen_code(op_mov,1,ap2,ecx);
- gen_code2(op,size,1,eax,ecx);
- gen_code(op_xchg,4,eax,ecx);
- if (regs[0])
- gen_pop(EAX,am_dreg,0);
- }
- }
- else
- if (ap2->mode == am_dreg) {
- if (ap2->preg != ECX)
- gen_code(op_xchg,4,ap2,ecx);
- gen_code2(op,size,1,ap1,ecx);
- if (ap2->preg != ECX)
- gen_code(op_xchg,4,ap2,ecx);
- }
- else {
- if (regs[1])
- gen_push(ECX,am_dreg,0);
- gen_code(op_mov,4,ap2,ecx);
- gen_code2(op,size,1,ap1,ecx);
- if (regs[1])
- gen_pop(ECX,am_dreg,0);
- }
- }
- AMODE *gen_shift(ENODE *node, int flags, int size, int op)
- /*
- * generate code to evaluate a shift node and return the
- * address mode of the result.
- */
- { AMODE *ap1, *ap2;
- ap1 = gen_expr(node->v.p[0],F_DREG | F_VOL,size);
- mark();
- ap2 = gen_expr(node->v.p[1],F_DREG | F_IMMED,natural_size(node->v.p[1]));
- doshift(ap1,ap2,size,op);
- freeop(ap2);
- release();
- make_legal(ap1,flags,size);
- return ap1;
- }
- void dodiv(AMODE *ap1, AMODE *ap2, int size, int op,int modflag)
- {
- AMODE *eax = makedreg(EAX), *edx = makedreg(EDX), *ecx = makedreg(ECX);
- if (ap2->mode == am_immed) {
- ap2 = make_muldivval(ap2);
- }
- if (ap1->preg != EAX) {
- int temp;
- gen_code(op_xchg,4,eax,ap1);
- if (ap1->mode == am_dreg && ap2->mode == am_dreg && ap1->preg == ap2->preg) {
- gen_code(op,4,eax,0);
- gen_code(op_xchg,4,eax,ap1);
- return;
- }
- temp = regs[0];
- regs[0] = regs[ap1->preg];
- regs[ap1->preg] = temp;
- }
- if (ap2->preg == EDX) {
- if (regs[1])
- gen_push(ECX,am_dreg,0);
- if (regs[2])
- gen_push(EDX,am_dreg,0);
- gen_code(op_mov,4,ecx,edx);
- gen_code(op_sub,4,edx,edx);
- gen_code(op,4,ecx,0);
- if (modflag)
- gen_code(op_xchg,4,eax,edx);
- if (regs[2])
- gen_pop(EDX,am_dreg,0);
- if (regs[1])
- gen_pop(ECX,am_dreg,0);
- }
- else {
- if (regs[2])
- gen_push(EDX,am_dreg,0);
- gen_code(op_sub,4,edx,edx);
- gen_code(op,4,ap2,0);
- if (modflag)
- gen_code(op_xchg,4,eax,edx);
- if (regs[2])
- gen_pop(EDX,am_dreg,0);
- }
- if (ap1->preg != EAX) {
- int temp;
- gen_code(op_xchg,4,eax,ap1);
- temp = regs[0];
- regs[0] = regs[ap1->preg];
- regs[ap1->preg] = temp;
- }
- }
- void domul(AMODE *ap1, AMODE *ap2, int size, int op)
- {
- AMODE *eax = makedreg(EAX), *edx = makedreg(EDX), *ecx = makedreg(ECX);
- if (ap2->mode == am_immed) {
- ap2 = make_muldivval(ap2);
- }
- if (ap1->preg != EAX) {
- int temp;
- gen_code(op_xchg,4,eax,ap1);
- if (ap1->mode == am_dreg && ap2->mode == am_dreg && ap1->preg == ap2->preg && ap1->preg != EDX) {
- gen_code(op,4,eax,0);
- gen_code(op_xchg,4,eax,ap1);
- return;
- }
- temp = regs[0];
- regs[0] = regs[ap1->preg];
- regs[ap1->preg] = temp;
- }
- if (ap2->preg == EDX) {
- if (regs[1])
- gen_push(ECX,am_dreg,0);
- if (regs[2])
- gen_push(EDX,am_dreg,0);
- gen_code(op_mov,4,ecx,edx);
- gen_code(op_sub,4,edx,edx);
- gen_code(op,4,ecx,0);
- if (regs[2])
- gen_pop(EDX,am_dreg,0);
- if (regs[1])
- gen_pop(ECX,am_dreg,0);
- }
- else {
- if (regs[2])
- gen_push(EDX,am_dreg,0);
- gen_code(op,4,ap2,0);
- if (regs[2])
- gen_pop(EDX,am_dreg,0);
- }
- if (ap1->preg != EAX) {
- int temp;
- gen_code(op_xchg,4,eax,ap1);
- temp = regs[0];
- regs[0] = regs[ap1->preg];
- regs[ap1->preg] = temp;
- }
- }
- AMODE *gen_modiv(ENODE *node, int flags, int size, int op, int modflag)
- /*
- * generate code to evaluate a mod operator or a divide
- * operator. these operations are done on only long
- * divisors and word dividends so that the 68000 div
- * instruction can be used.
- */
- { AMODE *ap1, *ap2;
-
- if (size > 4) {
- ap1 = gen_expr(node->v.p[0],F_FREG | F_VOL,size);
- ap2 = gen_expr(node->v.p[1],F_ALL,size);
- op = op_fdiv;
- if (ap2->mode == am_freg)
- gen_code(op,0,0,0);
- else {
- int t;
- t = natural_size(node->v.p[1]);
- if (t== 0) t = size;
- if (t <=4)
- op = op_fidiv;
- gen_f10code(op,t,ap2,0);
- }
- ap1 = fstack();
- do_extend(ap1,10,size,flags);
- make_legal(ap1,flags,size);
- return ap1;
- }
- if (op == op_idiv) {
- ap1 = gen_expr(node->v.p[0],F_DREG | F_VOL,-4);
- }
- else {
- ap1 = gen_expr(node->v.p[0],F_DREG | F_VOL,4);
- }
- mark();
- if (op == op_idiv) {
- ap2 = gen_expr(node->v.p[1],F_ALL,-4);
- }
- else {
- ap2 = gen_expr(node->v.p[1],F_ALL,4);
- }
- dodiv(ap1,ap2,size,op,modflag);
- freeop(ap2);
- release();
- make_legal(ap1,flags,size);
- return ap1;
-
- }
- void swap_nodes(ENODE *node)
- /*
- * exchange the two operands in a node.
- */
- { ENODE *temp;
- temp = node->v.p[0];
- node->v.p[0] = node->v.p[1];
- node->v.p[1] = temp;
- }
- AMODE * gen_pdiv(ENODE *node, int flags, int size)
- {
- return gen_modiv(node,flags,size,op_div,FALSE);
- }
- AMODE * gen_pmul(ENODE *node, int flags, int size)
- {
- return gen_mul(node,flags,size,op_mul);
- }
- AMODE *gen_mul(ENODE *node, int flags, int size, int op)
- /*
- * generate code to evaluate a multiply node. both operands
- * are treated as words and the result is long and is always
- * in a register so that the 68000 mul instruction can be used.
- */
- { AMODE *ap1, *ap2;
- if (isintconst(node->v.p[0]->nodetype))
- swap_nodes(node);
- if (size > 4) {
- ap1 = gen_expr(node->v.p[0],F_FREG | F_VOL,size);
- ap2 = gen_expr(node->v.p[1],F_ALL,size);
- op = op_fmul;
- if (ap2->mode == am_freg)
- gen_code(op,0,0,0);
- else {
- int t;
- t = natural_size(node->v.p[1]);
- if (t== 0) t = size;
- if (t <=4)
- op = op_fimul;
- gen_f10code(op,t,ap2,0);
- }
- ap1 = fstack();
- do_extend(ap1,10,size,flags);
- make_legal(ap1,flags,size);
- return ap1;
- }
- if (op == op_imul) {
- ap1 = gen_expr(node->v.p[0],F_DREG | F_VOL,-4);
- }
- else {
- ap1 = gen_expr(node->v.p[0],F_DREG | F_VOL,4);
- }
- mark();
- if (op == op_imul) {
- ap2 = gen_expr(node->v.p[1],F_ALL,-4);
- }
- else {
- ap2 = gen_expr(node->v.p[1],F_ALL,4);
- }
- domul(ap1,ap2,size,op);
- freeop(ap2);
- release();
- do_extend(ap1,4,size,flags);
- make_legal(ap1,flags,size);
- return ap1;
- }
- AMODE *gen_hook(ENODE *node, int flags, int size)
- /*
- * generate code to evaluate a condition operator node (?:)
- */
- { AMODE *ap1, *ap2;
- int false_label, end_label;
- false_label = nextlabel++;
- end_label = nextlabel++;
- flags = (flags & (F_AREG | F_DREG)) | F_VOL;
- falsejp(node->v.p[0],false_label);
- node = node->v.p[1];
- ap1 = gen_expr(node->v.p[0],flags,size);
- freeop(ap1);
- gen_code(op_jmp,0,make_label(end_label),0);
- gen_label(false_label);
- ap2 = gen_expr(node->v.p[1],flags,size);
- if( !equal_address(ap1,ap2) )
- {
- freeop(ap2);
- temp_data();
- gen_code(op_mov,size,ap2,ap1);
- }
- gen_label(end_label);
- return ap1;
- }
- void floatstore(AMODE *ap, int size, int flags)
- {
- if (size <= 4)
- if (flags & F_NOVALUE)
- gen_codef(op_fistp,size,ap,0);
- else
- gen_codef(op_fist,size,ap,0);
- else
- if (flags & F_NOVALUE)
- gen_codef(op_fstp,size,ap,0);
- else
- gen_codef(op_fst,size,ap,0);
- }
- AMODE *gen_asadd(ENODE *node, int flags, int size, int op, int fop)
- /*
- * generate a plus equal or a minus equal node.
- */
- { AMODE *ap1, *ap2, *ap3;
- int ssize,rsize;
- ssize = natural_size(node->v.p[0]);
- rsize = natural_size(node->v.p[1]);
- if (rsize == 0)
- rsize = ssize;
- if (rsize > 4) {
- ap2 = gen_expr(node->v.p[0],F_FREG,rsize);
- ap3 = gen_expr(node->v.p[0],F_MEM,ssize);
- ap1 = gen_expr(node->v.p[1],F_FREG | F_MEM,rsize);
- if (ap1->mode == am_freg)
- gen_code(fop,0,0,0);
- else {
- if (rsize <= 4)
- if (fop == op_fadd)
- fop = op_fiadd;
- else
- fop = op_fisub;
- gen_f10code(fop,rsize,ap1,0);
- }
- floatstore(ap3,ssize,flags);
- gen_codef(op_fwait,0,0,0);
- if (!(flags & F_NOVALUE)) {
- ap2 = fstack();
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,size);
- }
- return ap2;
- }
- if (chksize( ssize ,rsize ))
- rsize = ssize;
- ap2 = gen_expr(node->v.p[0],F_ALL | F_NOBIT | F_DEST,ssize);
- mark();
- ap1 = gen_expr(node->v.p[1],F_DREG | F_IMMED,rsize);
- if (node->v.p[0]->nodetype == en_bits)
- ap3= get_bitval(ap2,node->v.p[0],ssize);
- if (node->v.p[0]->nodetype == en_bits) {
- gen_code(op,ssize,ap3,ap1);
- bit_move(ap2,ap3,node->v.p[0],flags, ssize,rsize);
- freeop(ap3);
- }
- else
- gen_code(op,ssize,ap2,ap1);
- freeop(ap1);
- release();
- if (flags & F_NOVALUE)
- freeop(ap2);
- else {
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,4);
- }
- return ap2;
- }
- AMODE *gen_aslogic(ENODE *node, int flags, int size, int op)
- /*
- * generate a and equal or a or equal node.
- */
- { AMODE *ap1, *ap2;
- int ssize,rsize;
- ssize = natural_size(node->v.p[0]);
- rsize = natural_size(node->v.p[1]);
- if (chksize( ssize , rsize ))
- rsize = ssize;
-
- ap2 = gen_expr(node->v.p[0],F_ALL | F_NOBIT | F_DEST,ssize);
- mark();
- ap1 = gen_expr(node->v.p[1],F_DREG | F_IMMED,rsize);
- if (node->v.p[0]->nodetype == en_bits) {
- if (ap1->mode == am_immed) {
- ap1->offset->v.i &= bittab[node->v.p[0]->bits-1];
- ap1->offset->v.i <<= node->v.p[0]->startbit;
- gen_code(op,ssize,ap2,ap1);
- }
- else {
- gen_code(op_and,ssize,ap1,make_immed(bittab[node->v.p[0]->bits-1]));
- if (node->v.p[0]->startbit)
- gen_code(op_shl,ssize,ap1,make_immed(node->v.p[0]->startbit));
- gen_code(op,ssize,ap2,ap1);
- if (!(flags & F_NOVALUE)) {
- freeop(ap1);
- release();
- if (node->v.p[0]->startbit)
- gen_code(op_shr,ssize,ap2,make_immed(node->v.p[0]->startbit));
- do_extend(ap2,ssize,size,0);
- make_legal(ap2,F_DREG,size);
- return(ap2);
- }
- }
- }
- else
- gen_code(op,ssize,ap2,ap1);
- freeop(ap1);
- release();
- if (flags & F_NOVALUE)
- freeop(ap2);
- else {
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,4);
- }
- return ap2;
- }
- AMODE *gen_asshift(ENODE *node, int flags, int size, int op)
- /*
- * generate shift equals operators.
- */
- {
- AMODE *ap1, *ap2, *ap3;
- int ssize = natural_size(node->v.p[0]);
- int rsize = natural_size(node->v.p[1]);
- if (chksize( ssize , rsize ))
- rsize = rsize;
- ap2 = gen_expr(node->v.p[0],F_ALL | F_NOBIT | F_DEST,ssize);
- mark();
- ap1 = gen_expr(node->v.p[1],F_DREG | F_IMMED,rsize);
- if (node->v.p[0]->nodetype == en_bits)
- ap3 = get_bitval(ap2,node->v.p[0],ssize);
- else
- ap3 = ap2;
- doshift(ap3,ap1,ssize,op);
- if (node->v.p[0]->nodetype == en_bits)
- bit_move(ap2,ap3,node->v.p[0],flags,ssize,rsize);
- freeop(ap1);
- release();
- if (ap3 != ap1)
- freeop(ap3);
- if (flags & F_NOVALUE)
- freeop(ap2);
- else {
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,4);
- }
- return ap2;
- }
- AMODE *gen_asmul(ENODE *node, int flags, int size,int op)
- /*
- * generate a *= node.
- */
- { AMODE *ap1, *ap2,*ap3;
- int ssize, lsize,rsize;
- ssize = natural_size(node->v.p[0]);
- rsize = natural_size(node->v.p[1]);
- if (rsize == 0)
- rsize = ssize;
- if (rsize > 4) {
- int fop = op_fmul;
- ap2 = gen_expr(node->v.p[0],F_FREG,rsize);
- ap3 = gen_expr(node->v.p[0],F_MEM,ssize);
- ap1 = gen_expr(node->v.p[1],F_FREG | F_MEM,rsize);
- if (ap1->mode == am_freg)
- gen_code(fop,0,0,0);
- else {
- if (rsize <= 4)
- fop = op_fimul;
- gen_f10code(fop,ssize,ap1,0);
- }
- floatstore(ap3,ssize,flags);
- gen_codef(op_fwait,0,0,0);
- if (!(flags & F_NOVALUE)) {
- ap2 = fstack();
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,size);
- }
- return ap2;
- }
- if (op == op_imul)
- lsize= -4;
- else
- lsize = 4;
- ap2 = gen_expr(node->v.p[0],F_ALL | F_NOBIT | F_DEST,ssize);
- mark();
- ap1 = gen_expr(node->v.p[1],F_ALL,lsize);
- ap3 = xalloc(sizeof(AMODE));
- ap3->mode = ap2->mode;
- ap3->preg = ap2->preg;
- ap3->sreg = ap2->sreg;
- ap3->scale = ap2->scale;
- ap3->offset = ap2->offset;
- if (node->v.p[0]->nodetype == en_bits)
- ap2 = get_bitval(ap2,node->v.p[0],ssize);
- else {
- make_legal(ap2,F_DREG | F_VOL,4);
- do_extend(ap2,ssize,lsize,F_DREG);
- }
- domul(ap2,ap1,lsize,op);
- freeop(ap1);
- release();
- if (!equal_address(ap2,ap3))
- if (node->v.p[0]->nodetype == en_bits)
- bit_move(ap3,ap2,node->v.p[0],flags,ssize,rsize);
- else
- gen_code(op_mov,ssize,ap3,ap2);
- if (flags & F_NOVALUE)
- freeop(ap2);
- else {
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,4);
- }
- return ap2;
- }
- AMODE *gen_asmodiv(ENODE *node, int flags, int size, int op, int modflag)
- /*
- * generate /= and %= nodes.
- */
- { AMODE *ap1, *ap2,*ap3;
- int ssize,lsize,rsize;
- ssize = natural_size(node->v.p[0]);
- rsize = natural_size(node->v.p[1]);
- if (rsize == 0)
- rsize = ssize;
- if (rsize > 4) {
- int fop = op_fdiv;
- ap2 = gen_expr(node->v.p[0],F_FREG,rsize);
- ap3 = gen_expr(node->v.p[0],F_MEM,ssize);
- ap1 = gen_expr(node->v.p[1],F_FREG | F_MEM,rsize);
- if (ap1->mode == am_freg)
- gen_code(fop,0,0,0);
- else {
- if (rsize <= 4)
- fop = op_fidiv;
- gen_f10code(fop,ssize,ap1,0);
- }
- floatstore(ap3,ssize,flags);
- gen_codef(op_fwait,0,0,0);
- if (!(flags & F_NOVALUE)) {
- ap2 = fstack();
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,size);
- }
- return ap2;
- }
- if (op == op_idiv)
- lsize= -4;
- else
- lsize = 4;
-
- ap2 = gen_expr(node->v.p[0],F_ALL | F_NOBIT | F_DEST, ssize);
- mark();
- ap1 = gen_expr(node->v.p[1],F_ALL,lsize);
- ap3 = xalloc(sizeof(AMODE));
- ap3->mode = ap2->mode;
- ap3->preg = ap2->preg;
- ap3->sreg = ap2->sreg;
- ap3->scale = ap2->scale;
- ap3->offset = ap2->offset;
- if (node->v.p[0]->nodetype == en_bits)
- ap2 = get_bitval(ap2,node->v.p[0],ssize);
- else {
- make_legal(ap2,F_DREG | F_VOL,4);
- do_extend(ap2,ssize,lsize,F_DREG);
- }
- dodiv(ap2,ap1,ssize,op,modflag);
- freeop(ap1);
- release();
- if (!equal_address(ap2,ap3))
- if (node->v.p[0]->nodetype == en_bits)
- bit_move(ap3,ap2,node->v.p[0],flags,ssize,rsize);
- else
- gen_code(op_mov,ssize,ap3,ap2);
- if (flags & F_NOVALUE)
- freeop(ap2);
- else {
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,4);
- }
- return ap2;
- }
- AMODE *gen_moveblock(ENODE *node, int flags, int size)
- {
- AMODE *ap1, *ap2;
- if (!node->size)
- return(0);
- ap2 = gen_expr(node->v.p[1],F_DREG | F_VOL,4);
- mark();
- ap1 = gen_expr(node->v.p[0],F_DREG | F_VOL,4);
- gen_push(ESI,am_dreg,0);
- gen_push(EDI,am_dreg,0);
- if (regs[1])
- gen_push(ECX,am_dreg,0);
- gen_code(op_mov,4,makedreg(ESI),ap2);
- gen_code(op_mov,4,makedreg(EDI),ap1);
- gen_code(op_mov,4,makedreg(ECX),make_immed(node->size));
- gen_code(op_cld,0,0,0);
- gen_code(op_rep,1,0,0);
- gen_code(op_movsb,1,0,0);
- if (regs[1])
- gen_pop(ECX,am_dreg,0);
- gen_pop(EDI,am_dreg,0);
- gen_pop(ESI,am_dreg,0);
- freeop(ap2);
- freeop(ap1);
- release();
- return(ap2);
- }
- AMODE *gen_assign(ENODE *node, int flags, int size)
- /*
- * generate code for an assignment node. if the size of the
- * assignment destination is larger than the size passed then
- * everything below this node will be evaluated with the
- * assignment size.
- */
- { AMODE *ap1, *ap2, *ap3,*ap4 = 0;
- int ssize,rsize;
- rsize = natural_size(node->v.p[1]);
- switch( node->v.p[0]->nodetype )
- {
- case en_bits:
- ssize = natural_size(node->v.p[0]);
- break;
- case en_ub_ref:
- case en_cub:
- ssize = 1;
- break;
- case en_b_ref:
- case en_cb:
- ssize = -1;
- break;
- case en_uw_ref:
- case en_cuw:
- ssize = 2;
- break;
- case en_w_ref:
- case en_cw:
- ssize = -2;
- break;
- case en_l_ref:
- case en_cl:
- ssize = -4;
- break;
- case en_ul_ref:
- case en_cul:
- case en_cp:
- ssize = 4;
- break;
- case en_tempref:
- case en_regref:
- ssize = node->v.p[0]->v.i >> 8;
- break;
- case en_floatref:
- case en_cf:
- ssize = 6;
- break;
- case en_doubleref:
- case en_cd:
- ssize = 8;
- break;
- case en_longdoubleref:
- case en_cld:
- ssize = 10;
- break;
- default:
- ssize = -4;
- }
- if (chksize( ssize , rsize ))
- rsize = ssize;
- ap2 = gen_expr(node->v.p[1],F_DREG | F_FREG | F_IMMED,rsize);
- mark();
- ap1 = gen_expr(node->v.p[0],F_ALL | F_NOBIT | F_DEST,ssize);
- if (!equal_address(ap1,ap2) ) {
- if (rsize > 4) {
- floatstore(ap1,ssize,flags);
- gen_codef(op_fwait,0,0,0);
- }
- else {
- if (node->v.p[0]->nodetype == en_bits) {
- bit_move(ap1,ap2,node->v.p[0],flags,ssize,rsize);
- }
- else {
- if (ap2->mode != am_dreg && ap2->mode != am_immed
- && ap1->mode != am_dreg) {
- freeop(ap2);
- ap3 = temp_data();
- gen_code(op_mov,ssize,ap3,ap2);
- gen_code(op_mov,ssize,ap1,ap3);
- }
- else {
- gen_code(op_mov,ssize,ap1,ap2);
- }
- }
- }
- }
- release();
- if (flags & F_NOVALUE)
- freeop(ap2);
- else {
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,size);
- }
- return ap2;
- }
- AMODE *gen_refassign(ENODE *node, int flags, int size)
- /*
- * generate code for an assignment node. if the size of the
- * assignment destination is larger than the size passed then
- * everything below this node will be evaluated with the
- * assignment size.
- */
- { AMODE *ap1, *ap2, *ap3,*ap4;
- int ssize,rsize;
- rsize = natural_size(node->v.p[1]);
- switch( node->v.p[0]->nodetype )
- {
- case en_bits:
- ssize = natural_size(node->v.p[0]);
- break;
- case en_ub_ref:
- case en_cub:
- ssize = 1;
- break;
- case en_b_ref:
- case en_cb:
- ssize = -1;
- break;
- case en_uw_ref:
- case en_cuw:
- ssize = 2;
- break;
- case en_w_ref:
- case en_cw:
- ssize = -2;
- break;
- case en_l_ref:
- case en_cl:
- ssize = -4;
- break;
- case en_ul_ref:
- case en_cul:
- case en_cp:
- ssize = 4;
- break;
- case en_tempref:
- case en_regref:
- ssize = node->v.p[0]->v.i >> 8;
- break;
- case en_floatref:
- case en_cf:
- ssize = 6;
- break;
- case en_doubleref:
- case en_cd:
- ssize = 8;
- break;
- case en_longdoubleref:
- case en_cld:
- ssize = 10;
- break;
- default:
- ssize = -4;
- }
- if (chksize( ssize , rsize ))
- rsize = ssize;
- ap2 = gen_expr(node->v.p[1],F_DREG | F_FREG,rsize);
- mark();
- ap1 = gen_expr(node->v.p[0],F_ALL | F_NOBIT | F_DEST,ssize);
- ap4 = xalloc(sizeof(AMODE));
- ap4->preg = ap1->preg;
- ap4->mode = am_indisp;
- ap4->offset = makenode(en_icon,0,0);
- if (!equal_address(ap1,ap2) )
- if (rsize > 4) {
- floatstore(ap4,ssize,flags);
- gen_codef(op_fwait,0,0,0);
- }
- else
- if (node->v.p[0]->nodetype == en_bits)
- bit_move(ap4,ap2,node->v.p[0],flags,ssize,rsize);
- else
- if (ap2->mode != am_dreg && ap2->mode != am_immed
- && ap4->mode != am_dreg) {
- ap3 = temp_data();
- gen_code(op_mov,rsize,ap3,ap2);
- gen_code(op_mov,ssize,ap4,ap3);
- freeop(ap3);
- }
- else
- gen_code(op_mov,ssize,ap4,ap2);
- freeop(ap1);
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,size);
- return ap2;
- }
- AMODE *gen_aincdec(ENODE *node, int flags, int size, int op)
- /*
- * generate an auto increment or decrement node. op should be
- * either op_add (for increment) or op_sub (for decrement).
- */
- { AMODE *ap1,*ap2;
- int ssize,rsize;
- ssize = natural_size(node->v.p[0]);
- if (!(flags & F_NOVALUE)) {
- ap2 = temp_data();
- }
- mark();
- ap1 = gen_expr(node->v.p[0],F_ALL,ssize);
- if (!(flags &F_NOVALUE)) {
- gen_code(op_mov,ssize,ap2,ap1);
- }
- gen_code(op,ssize,ap1,make_immed((int)node->v.p[1]));
- freeop(ap1);
- release();
- if (!(flags & F_NOVALUE)) {
- do_extend(ap2,ssize,size,flags);
- make_legal(ap2,flags,size);
- }
- return ap2;
- }
- int push_param(ENODE *ep, int size)
- /*
- * push the operand expression onto the stack.
- */
- { AMODE *ap, *ap2;
- int rv,sz;
- switch (ep->nodetype) {
- case en_absacon:
- ep->v.i = (( SYM *)ep->v.p[0])->value.i;
- ap = xalloc(sizeof(AMODE));
- ap->mode = am_immed;
- ap->offset = ep; /* use as constant node */
- gen_code(op_push,4,ap,0);
- rv = 4;
- break;
- case en_napccon:
- case en_nacon:
- ep->v.p[0] = ((SYM *)ep->v.p[0])->name;
- case en_labcon:
- case en_nalabcon:
- ap = xalloc(sizeof(AMODE));
- ap->mode = am_immed;
- ap->offset = ep; /* use as constant node */
- gen_code(op_push,4,ap,0);
- make_legal(ap,F_ALL,4);
- rv = 4;
- break;
- case en_cf:
- case en_floatref:
- ap = gen_expr(ep,F_FREG | F_VOL,6);
- gen_code(op_sub,4,makedreg(ESP),make_immed(4));
- ap2 = make_immed(0);
- ap2->preg = ESP;
- ap2->mode = am_indisp;
- gen_codef(op_fstp,6,ap2,0);
- gen_codef(op_fwait,0,0,0);
- rv = 4;
- break;
- case en_cd:
- case en_doubleref:
- ap = gen_expr(ep,F_FREG | F_VOL,8);
- gen_code(op_sub,4,makedreg(ESP),make_immed(8));
- ap2 = make_immed(0);
- ap2->preg = ESP;
- ap2->mode = am_indisp;
- gen_codef(op_fstp,8,ap2,0);
- gen_codef(op_fwait,0,0,0);
- rv = 8;
- break;
- case en_cld:
- case en_longdoubleref:
- ap = gen_expr(ep,F_FREG | F_VOL,8);
- gen_code(op_sub,4,makedreg(ESP),make_immed(10));
- ap2 = make_immed(0);
- ap2->preg = ESP;
- ap2->mode = am_indisp;
- gen_codef(op_fstp,10,ap2,0);
- gen_codef(op_fwait,0,0,0);
- rv = 8;
- break;
- case en_rcon:
- case en_fcon:
- case en_lrcon:
- rv = size;
- if (rv == 6) rv= 4;
- if (rv == 10) rv= 12;
- ap = gen_expr(ep,F_FREG | F_VOL,size);
- make_floatconst(ap,size);
- gen_code(op_sub,4,makedreg(ESP),make_immed(rv));
- ap2 = make_immed(0);
- ap2->preg = ESP;
- ap2->mode = am_indisp;
- gen_codef(op_fstp,rv,ap2,0);
- gen_codef(op_fwait,0,0,0);
- break;
- default:
- rv = 4;
- ap = gen_expr(ep,F_ALL,4);
- if (ap->mode != am_dreg &&ap->mode != am_immed&& ap->mode != am_freg) {
- sz = natural_size(ep->v.p[0]);
- if (sz < 4 && sz >-4)
- do_extend(ap,sz,4,F_DREG);
- }
- if (ap->mode == am_freg) {
- gen_code(op_push,4,makedreg(3),0);
- ap2 = make_immed(0);
- ap2->preg = ESP;
- ap2->mode = am_indisp;
- gen_codef(op_fistp,4,ap2,0);
- gen_codef(op_fwait,0,0,0);
- }
- else
- gen_code(op_push,4,ap,0);
- break;
- }
- freeop(ap);
- stackdepth += rv;
- return(rv);
- }
- int push_stackblock(ENODE *ep)
- {
- AMODE *ap;
- int sz = (ep->size + stackadd) &stackmod;
- if (!sz)
- return(0);
- gen_code(op_sub,4,makedreg(ESP),make_immed(sz));
- gen_code(op_push,4,makedreg(ESI),0);
- gen_code(op_push,4,makedreg(EDI),0);
- stackdepth+=sz+8;
- gen_code(op_lea,4,makedreg(EDI),make_stack(-8));
- switch (ep->nodetype) {
- case en_napccon:
- case en_nacon:
- ep->v.p[0] = ((SYM *)ep->v.p[0])->name;
- case en_nalabcon:
- case en_labcon:
- ap = xalloc(sizeof(AMODE));
- ap->mode = am_direct;
- ap->offset = ep; /* use as constant node */
- gen_code(op_lea,4,makedreg(ESI),ap);
- break;
- case en_absacon:
- ep->v.i = (( SYM *)ep->v.p[0])->value.i;
- ap = xalloc(sizeof(AMODE));
- ap->mode = am_direct;
- ap->offset = ep; /* use as constant node */
- gen_code(op_lea,4,makedreg(ESI),ap);
- break;
- default:
- ap = gen_expr(ep,F_DREG | F_MEM | F_IMMED,4);
- gen_code(op_mov,4,makedreg(ESI),ap);
- break;
- }
- gen_code(op_mov,4,makedreg(ECX),make_immed(sz));
- gen_code(op_cld,0,0,0);
- gen_code(op_rep,0,0,0);
- gen_code(op_movsb,0,0,0);
- gen_code(op_pop,4,makedreg(EDI),0);
- gen_code(op_pop,4,makedreg(ESI),0);
- stackdepth-=8;
- freeop(ap);
- return(sz);
- }
- int gen_parms(ENODE *plist,int size)
- /*
- * push a list of parameters onto the stack and return the
- * size of parameters pushed.
- */
- { int i;
- i = 0;
- while( plist != 0 )
- {
- if (plist->nodetype == en_stackblock)
- i+=push_stackblock(plist->v.p[0]);
- else
- i+=push_param(plist->v.p[0],size);
- plist = plist->v.p[1];
- }
- return i;
- }
- AMODE *gen_fcall(ENODE *node,int flags, int size)
- /*
- * generate a function call node and return the address mode
- * of the result.
- */
- { AMODE *ap, *result;
- ENODE *node2;
- int i,ssize;
- result = temp_data();
- temp_data(); temp_data(); /* push any used data registers */
- freeop(result); freeop(result); freeop(result);
- if (node->nodetype == en_callblock) {
- i = gen_parms(node->v.p[1]->v.p[1]->v.p[1]->v.p[0],size);
- ap = gen_expr(node->v.p[0],F_ALL,4);
- gen_code(op_push,4,ap,0);
- i+=4;
- stackdepth+=4;
- node = node->v.p[1];
- freeop(ap);
- ssize = 4;
- }
- else {
- i = gen_parms(node->v.p[1]->v.p[1]->v.p[0],size); /* generate parameters */
- ssize = node->v.p[0]->v.i;
- }
- if (node->nodetype == en_intcall) {
- AMODE *ap2 = xalloc(sizeof(AMODE));
- ap2->mode = am_seg;
- ap2->seg = e_cs;
- gen_code(op_pushfd,0,0,0);
- gen_code(op_push,0,ap2,0);
- }
-
- if( node->v.p[1]->v.p[0]->nodetype == en_nacon || node->v.p[1]->v.p[0]->nodetype == en_napccon ) {
- SYM *sp= node->v.p[1]->v.p[0]->v.p[0];
- if (sp->inreg) {
- ap = makedreg(sp->value.i);
- }
- else {
- node->v.p[1]->v.p[0]->v.p[0] = sp->name;
- ap = make_offset(node->v.p[1]->v.p[0]);
- ap->mode = am_immed;
- }
- gen_code(op_call,0,ap,0);
- }
- else
- {
- if (node->v.p[1]->v.p[0]->nodetype == en_l_ref) {
- node2=node->v.p[1]->v.p[0]->v.p[0];
- }
- else {
- if (node->v.p[1]->v.p[0]->nodetype != en_tempref)
- DIAG("gen_fcall - questionable indirection");
- node2=node->v.p[1]->v.p[0];
- }
- ap = gen_expr(node2,F_ALL,4);
- freeop(ap);
- gen_code(op_call,4,ap,0);
- }
- if( i != 0 ) {
- if (i == 4)
- gen_code(op_pop,4,makedreg(ECX),0);
- else
- gen_code(op_add,4,makedreg(4),make_immed(i));
- stackdepth -= i;
- }
- if (ssize > 4) {
- result = fstack();
- }
- else {
- result = temp_data();
- if( result->preg != EAX)
- gen_code(op_mov,4,result,makedreg(EAX));
- }
- result->tempflag = 1;
- do_extend(result,ssize,size,flags);
- make_legal(result,flags,size);
- return result;
- }
- AMODE *gen_pfcall(ENODE *node,int flags, int size)
- /*
- * generate a function call node to a pascal function
- * and return the address mode of the result.
- */
- { AMODE *ap, *result;
- int i,ssize;
- ENODE * invnode = 0,*anode,*node2;
-
- /* invert the parameter list */
- if (node->nodetype == en_pcallblock)
- anode = node->v.p[1]->v.p[1]->v.p[1]->v.p[0];
- else
- anode = node->v.p[1]->v.p[1]->v.p[0];
- while (anode) {
- invnode = makenode(anode->nodetype,anode->v.p[0],invnode);
- anode = anode->v.p[1];
- }
- result = temp_data();
- temp_data(); temp_data(); /* push any used data registers */
- freeop(result); freeop(result); freeop(result);
- if (node->nodetype == en_pcallblock) {
- ap = gen_expr(node->v.p[0],F_ALL,4);
- gen_code(op_push,4,ap,0);
- freeop(ap);
- i=4;
- stackdepth+=4;
- i += gen_parms(invnode,size);
- node = node->v.p[1];
- ssize = 4;
- }
- else {
- i = gen_parms(invnode,size); /* generate parameters */
- ssize = node->v.p[0]->v.i;
- }
-
- if( node->v.p[1]->v.p[0]->nodetype == en_nacon || node->v.p[1]->v.p[0]->nodetype == en_napccon ) {
- SYM *sp= node->v.p[1]->v.p[0]->v.p[0];
- if (sp->inreg) {
- ap = makedreg(sp->value.i);
- }
- else {
- node->v.p[0]->v.p[0]->v.p[0] = sp->name;
- ap = make_offset(node->v.p[1]->v.p[0]);
- ap->mode = am_immed;
- }
- gen_code(op_call,0,ap,0);
- }
- else
- {
- if (node->v.p[1]->v.p[0]->nodetype == en_l_ref) {
- node2=node->v.p[1]->v.p[0]->v.p[0];
- }
- else {
- if (node->v.p[1]->v.p[0]->nodetype != en_tempref)
- DIAG("gen_fcall - questionable indirection");
- node2=node->v.p[1]->v.p[0];
- }
- ap = gen_expr(node2,F_ALL,4);
- freeop(ap);
- gen_code(op_call,4,ap,0);
- }
- stackdepth -= i;
- if (ssize > 4) {
- result = fstack();
- }
- else {
- result = temp_data();
- if( result->preg != EAX)
- gen_code(op_mov,4,result,makedreg(EAX));
- }
- result->tempflag = 1;
- do_extend(result,ssize,size,flags);
- make_legal(result,flags,size);
- return result;
- }
- AMODE *gen_expr(ENODE *node, int flags, int size)
- /*
- * general expression evaluation. returns the addressing mode
- * of the result.
- */
- {
- AMODE *ap1, *ap2;
- int lab0, lab1;
- int natsize;
- if( node == 0 )
- {
- DIAG("null node in gen_expr.");
- return 0;
- }
- switch( node->nodetype )
- {
- case en_bits:
- size = natural_size(node->v.p[0]);
- ap1 = gen_expr(node->v.p[0],F_ALL,size);
- if (!(flags & F_NOBIT))
- bit_legal(ap1,node,size);
- return ap1;
- case en_cb:
- case en_cub:
- case en_cw:
- case en_cuw:
- case en_cl:
- case en_cul:
- case en_cf:
- case en_cd:
- case en_cld:
- case en_cp:
- ap1 = gen_expr(node->v.p[0],flags | F_MEM | F_DREG | F_FREG,natural_size(node->v.p[0]));
- do_extend(ap1,natural_size(node->v.p[0]),size,flags);
- make_legal(ap1,flags,size);
- return ap1;
- case en_napccon:
- case en_nacon:
- node->v.p[0] = ((SYM *)node->v.p[0])->name;
- case en_nalabcon:
- case en_labcon:
- ap1 = temp_data();
- ap1->tempflag = TRUE;
- ap2 = xalloc(sizeof(AMODE));
- ap2->mode = am_direct;
- ap2->offset = node; /* use as constant node */
- gen_code(op_lea,4,ap1,ap2);
- make_legal(ap1,flags,size);
- return ap1; /* return reg */
- case en_icon:
- case en_lcon: case en_lucon: case en_iucon: case en_ccon:
- case en_rcon: case en_lrcon: case en_fcon:
- ap1 = xalloc(sizeof(AMODE));
- ap1->mode = am_immed;
- ap1->offset = node;
- make_legal(ap1,flags,size);
- return ap1;
- case en_absacon:
- node->v.i = ((SYM *)node->v.p[0])->value.i;
- ap1 = temp_data();
- ap1->tempflag = TRUE;
- ap2 = xalloc(sizeof(AMODE));
- ap2->mode = am_direct;
- ap2->offset = node; /* use as constant node */
- gen_code(op_lea,4,ap1,ap2);
- make_legal(ap1,flags,size);
- return ap1; /* return reg */
- case en_autocon:
- case en_autoreg:
- ap1 = temp_data();
- ap1->tempflag = TRUE;
- ap2 = xalloc(sizeof(AMODE));
- ap2->mode = am_indisp;
- ap2->preg = ESP;
- if (prm_linkreg) {
- ap2->preg = EBP;
- ap2->offset = makenode(en_icon,(char *)((SYM *)node->v.p[0])->value.i,0);
- }
- else if (((SYM *)node->v.p[0])->funcparm)
- ap2->offset = makenode(en_icon,(char *)(((SYM *)node->v.p[0])->value.i+framedepth+stackdepth),0);
- else
- ap2->offset = makenode(en_icon,(char *)(((SYM *)node->v.p[0])->value.i+stackdepth+lc_maxauto),0);
- gen_code(op_lea,4,ap1,ap2);
- make_legal(ap1,flags,size);
- return ap1; /* return reg */
- case en_b_ref:
- case en_w_ref:
- case en_ub_ref:
- case en_uw_ref:
- case en_l_ref:
- case en_ul_ref:
- case en_floatref:
- case en_doubleref:
- case en_longdoubleref:
- return gen_deref(node,flags,size);
- case en_tempref:
- case en_regref:
- ap1 = xalloc(sizeof(AMODE));
- ap1->tempflag = 0;
- if( (node->v.i & 0xff) < 16 )
- {
- ap1->mode = am_dreg;
- ap1->preg = node->v.i & 0xff;
- ap1->tempflag = 1;
- }
- else
- if ((node->v.i &0xff) < 32)
- {
- ap1->mode = am_dreg;
- ap1->preg = (node->v.i & 0xff)- 12;
- }
- else
- {
- ap1->mode = am_freg;
- ap1->preg = (node->v.i & 0xff) - 32;
- }
- ap1->tempflag = 0; /* not a temporary */
- do_extend(ap1,node->v.i >> 8,size,flags);
- make_legal(ap1,flags,size);
- return ap1;
- case en_uminus:
- return gen_unary(node,flags,size,op_neg, op_fchs);
- case en_compl:
- return gen_unary(node,flags,size,op_not, op_not);
- case en_add:
- return gen_binary(node,flags,size,op_add,op_fadd);
- case en_sub:
- return gen_binary(node,flags,size,op_sub,op_fsub);
- case en_and:
- return gen_binary(node,flags,size,op_and,op_and);
- case en_or:
- return gen_binary(node,flags,size,op_or,op_or);
- case en_xor:
- return gen_xbin(node,flags,size,op_xor,op_xor);
- case en_pmul:
- return gen_pmul(node,flags,size);
- case en_pdiv:
- return gen_pdiv(node,flags,size);
- case en_mul:
- return gen_mul(node,flags,size,op_imul);
- case en_umul:
- return gen_mul(node,flags,size,op_mul);
- case en_div:
- return gen_modiv(node,flags,size,op_idiv,0);
- case en_udiv:
- return gen_modiv(node,flags,size,op_div,0);
- case en_mod:
- return gen_modiv(node,flags,size,op_idiv,1);
- case en_umod:
- return gen_modiv(node,flags,size,op_div,1);
- case en_alsh:
- return gen_shift(node,flags,size,op_sal);
- case en_arsh:
- return gen_shift(node,flags,size,op_sar);
- case en_lsh:
- return gen_shift(node,flags,size,op_shl);
- case en_rsh:
- return gen_shift(node,flags,size,op_shr);
- case en_asadd:
- return gen_asadd(node,flags,size,op_add,op_fadd);
- case en_assub:
- return gen_asadd(node,flags,size,op_sub,op_fsub);
- case en_asand:
- return gen_aslogic(node,flags,size,op_and);
- case en_asor:
- return gen_aslogic(node,flags,size,op_or);
- case en_asxor:
- return gen_aslogic(node,flags,size,op_xor);
- case en_aslsh:
- return gen_asshift(node,flags,size,op_shl);
- case en_asrsh:
- return gen_asshift(node,flags,size,op_shr);
- case en_asalsh:
- return gen_asshift(node,flags,size,op_sal);
- case en_asarsh:
- return gen_asshift(node,flags,size,op_sar);
- case en_asmul:
- return gen_asmul(node,flags,size, op_imul);
- case en_asumul:
- return gen_asmul(node,flags,size,op_mul);
- case en_asdiv:
- return gen_asmodiv(node,flags,size,op_idiv,FALSE);
- case en_asudiv:
- return gen_asmodiv(node,flags,size,op_div,FALSE);
- case en_asmod:
- return gen_asmodiv(node,flags,size,op_idiv,TRUE);
- case en_asumod:
- return gen_asmodiv(node,flags,size,op_div,TRUE);
- case en_assign:
- return gen_assign(node,flags,size);
- case en_refassign:
- return gen_refassign(node,flags|F_NOVALUE,size);
- case en_moveblock:
- return gen_moveblock(node,flags,size);
- case en_ainc:
- return gen_aincdec(node,flags,size,op_add);
- case en_adec:
- return gen_aincdec(node,flags,size,op_sub);
- case en_land: case en_lor:
- case en_eq: case en_ne:
- case en_lt: case en_le:
- case en_gt: case en_ge:
- case en_ult: case en_ule:
- case en_ugt: case en_uge:
- case en_not:
- lab0 = nextlabel++;
- lab1 = nextlabel++;
- falsejp(node,lab0);
- ap1 = temp_data();
- gen_code(op_sub,4,ap1,ap1);
- gen_code(op_inc,4,ap1,0);
- gen_code(op_jmp,0,make_label(lab1),0);
- gen_label(lab0);
- gen_code(op_sub,4,ap1,ap1);
- gen_label(lab1);
- return ap1;
- case en_cond:
- return gen_hook(node,flags,size);
- case en_void:
- natsize = natural_size(node->v.p[0]);
- freeop(gen_expr(node->v.p[0],F_ALL | F_NOVALUE,natsize));
- return gen_expr(node->v.p[1],flags,size);
- case en_pfcall: case en_pfcallb: case en_pcallblock:
- return gen_pfcall(node,flags,size);
- case en_fcall: case en_callblock: case en_fcallb:
- case en_trapcall:
- case en_intcall:
- return gen_fcall(node,flags,size);
- default:
- DIAG("uncoded node in gen_expr.");
- return 0;
- }
- }
- int natural_size(ENODE *node)
- /*
- * return the natural evaluation size of a node.
- */
- { int siz0, ssize;
- if( node == 0 )
- return 0;
- switch( node->nodetype )
- {
- case en_absacon:
- return stdaddrsize;
- case en_bits:
- return 4;
- case en_icon:
- case en_lcon:
- case en_lucon:
- case en_iucon:
- return 0;
- case en_ccon:
- return 0;
- case en_rcon:
- return 0;
- case en_doubleref:
- return 8;
- case en_lrcon:
- return 0;
- case en_longdoubleref:
- return 10;
- case en_fcon:
- return 0;
- case en_floatref:
- return 6;
- case en_trapcall:
- case en_labcon:
- case en_nacon: case en_autocon: case en_autoreg:
- case en_napccon: case en_nalabcon:
- return stdaddrsize;
- case en_l_ref:
- case en_cl:
- return -4;
- case en_pfcall: case en_pfcallb:
- case en_fcall: case en_intcall: case en_callblock: case en_fcallb:
- case en_pcallblock:
- return natural_size(node->v.p[1]);
- case en_tempref:
- case en_regref:
- return node->v.i >> 8;
- case en_ul_ref:
- case en_cul:
- return 4;
- case en_cp:
- return stdaddrsize;
- case en_ub_ref:
- case en_cub:
- return 1;
- case en_b_ref:
- case en_cb:
- return -1;
- case en_uw_ref:
- case en_cuw:
- return 2;
- case en_cw:
- case en_w_ref:
- return -2;
- case en_cd:
- return 8;
- case en_cld:
- return stdldoublesize;
- case en_cf:
- return 6;
- case en_not: case en_compl:
- case en_uminus: case en_assign: case en_refassign:
- case en_ainc: case en_adec:
- case en_moveblock: case en_stackblock:
- return natural_size(node->v.p[0]);
- case en_add: case en_sub:
- case en_umul: case en_udiv: case en_umod: case en_pmul:
- case en_mul: case en_div: case en_pdiv:
- case en_mod: case en_and:
- case en_or: case en_xor:
- case en_asalsh: case en_asarsh: case en_alsh: case en_arsh:
- case en_lsh: case en_rsh:
- case en_eq: case en_ne:
- case en_lt: case en_le:
- case en_gt: case en_ge:
- case en_ugt: case en_uge: case en_ult: case en_ule:
- case en_land: case en_lor:
- case en_asadd: case en_assub:
- case en_asmul: case en_asdiv:
- case en_asmod: case en_asand:
- case en_asumod: case en_asudiv: case en_asumul:
- case en_asor: case en_aslsh: case en_asxor:
- case en_asrsh:
- siz0 = natural_size(node->v.p[0]);
- ssize = natural_size(node->v.p[1]);
- if( chksize(ssize, siz0 ))
- return ssize;
- else
- return siz0;
- case en_void: case en_cond:
- return natural_size(node->v.p[1]);
- default:
- DIAG("natural size error.");
- break;
- }
- return 0;
- }
- void gen_compare(ENODE *node, int btype1, int btype2, int btype3, int btype4, int label)
- /*
- * generate code to do a comparison of the two operands of
- * node.
- */
- { AMODE *ap1, *ap2, *ap3;
- int size;
- int btype = btype1;
- ap3 = 0;
- size = natural_size(node);
- if (size > 4) {
- ap1 = gen_expr(node->v.p[0],F_FREG | F_VOL, size);
- ap2 = gen_expr(node->v.p[1],F_ALL, size);
- if (ap2->mode == am_freg) {
- gen_codef(op_fcompp,0,0,0);
- }
- else
- gen_codef(op_fcomp,size,ap2,0);
- if (regs[0])
- gen_push(EAX,am_dreg,0);
- gen_codef(op_fstsw,2,makedreg(EAX),0);
- gen_codef(op_fwait,0,0,0);
- gen_code(op_sahf,0,0,0);
- if (regs[0])
- gen_pop(EAX,am_dreg,0);
- gen_branch(btype3,0,make_label(label));
- return;
- }
- ap1 = gen_expr(node->v.p[0],F_ALL,size);
- mark();
- ap2 = gen_expr(node->v.p[1],F_ALL,size);
- if (ap1->mode != am_dreg) {
- if (ap2->mode == am_immed) {
- if (ap1->mode == am_immed)
- goto cmp2;
- }
- else {
- if (ap2->mode == am_dreg) {
- swapit:
- ap3 = ap2;
- ap2 = ap1;
- ap1 = ap3;
- ap3 = 0;
- btype = btype2;
- }
- else
- if (ap1->mode == am_immed) {
- goto swapit;
- }
- else {
- cmp2:
- ap3 = ap1;
- ap1 = temp_data();
- gen_code(op_mov,size,ap1,ap3);
- make_legal(ap1,F_DREG,size);
- }
- }
- }
- if (ap1->mode == am_dreg && ap2->mode == am_immed && ap2->offset->v.i == 0)
- gen_code(op_or,size,ap1,ap1);
- else
- gen_code(op_cmp,size,ap1,ap2);
- release();
- gen_branch(btype,0,make_label(label));
- if (ap3) {
- freeop(ap1);
- freeop(ap2);
- freeop(ap3);
- }
- else {
- freeop(ap2);
- freeop(ap1);
- }
- }
- void truejp(ENODE *node, int label)
- /*
- * generate a jump to label if the node passed evaluates to
- * a true condition.
- */
- { AMODE *ap1;
- int ssize;
- int lab0;
- if( node == 0 )
- return;
- switch( node->nodetype )
- {
- case en_eq:
- gen_compare(node,op_je,op_je,op_je,op_je,label);
- break;
- case en_ne:
- gen_compare(node,op_jne,op_jne,op_jne,op_jne,label);
- break;
- case en_lt:
- gen_compare(node,op_jl,op_jg,op_jb,op_ja,label);
- break;
- case en_le:
- gen_compare(node,op_jle,op_jge,op_jbe,op_jnc,label);
- break;
- case en_gt:
- gen_compare(node,op_jg,op_jl,op_ja,op_jb,label);
- break;
- case en_ge:
- gen_compare(node,op_jge,op_jle,op_jnc,op_jbe,label);
- break;
- case en_ult:
- gen_compare(node,op_jb,op_ja,op_jb,op_ja,label);
- break;
- case en_ule:
- gen_compare(node,op_jbe,op_jnc,op_jbe,op_jnc,label);
- break;
- case en_ugt:
- gen_compare(node,op_ja,op_jb,op_ja,op_jb,label);
- break;
- case en_uge:
- gen_compare(node,op_jnc,op_jbe,op_jnc,op_jbe,label);
- break;
- case en_land:
- lab0 = nextlabel++;
- falsejp(node->v.p[0],lab0);
- truejp(node->v.p[1],label);
- gen_label(lab0);
- break;
- case en_lor:
- truejp(node->v.p[0],label);
- truejp(node->v.p[1],label);
- break;
- case en_not:
- falsejp(node->v.p[0],label);
- break;
- default:
- ssize = natural_size(node);
- if (isintconst(node->nodetype)) {
- if (node->v.i != 0)
- gen_code(op_jmp,0,make_label(label),0);
- break;
- }
- else
- if (ssize > 4) {
- ap1 = gen_expr(node,F_FREG | F_VOL, ssize);
- }
- else
- ap1 = gen_expr(node,F_ALL,ssize);
- if (ssize > 4) {
- gen_codef(op_fldz,0,0,0);
- gen_codef(op_fcompp,0,0,0);
- if (regs[0])
- gen_push(EAX,am_dreg,0);
- gen_codef(op_fstsw,2,makedreg(EAX),0);
- gen_codef(op_fwait,0,0,0);
- gen_code(op_sahf,0,0,0);
- if (regs[0])
- gen_pop(EAX,am_dreg,0);
- }
- else {
- if (ap1->mode == am_dreg)
- gen_code(op_or,ssize,ap1,ap1);
- else
- gen_code(op_test,ssize,ap1,make_immedt(0xffffffffL,ssize));
- freeop(ap1);
- }
- gen_branch(op_jne,0,make_label(label));
- break;
- }
- }
- void falsejp(ENODE *node, int label)
- /*
- * generate code to execute a jump to label if the expression
- * passed is false.
- */
- { AMODE *ap1;
- int ssize;
- int lab0;
- if( node == 0 )
- return;
- switch( node->nodetype )
- {
- case en_eq:
- gen_compare(node,op_jne,op_jne,op_jne,op_jne,label);
- break;
- case en_ne:
- gen_compare(node,op_je,op_je,op_je,op_je,label);
- break;
- case en_lt:
- gen_compare(node,op_jge,op_jle,op_jnc,op_jbe,label);
- break;
- case en_le:
- gen_compare(node,op_jg,op_jl,op_ja,op_jb,label);
- break;
- case en_gt:
- gen_compare(node,op_jle,op_jge,op_jbe,op_jnc,label);
- break;
- case en_ge:
- gen_compare(node,op_jl,op_jg,op_jb,op_ja,label);
- break;
- case en_ult:
- gen_compare(node,op_jnc,op_jbe,op_jnc,op_jbe,label);
- break;
- case en_ule:
- gen_compare(node,op_ja,op_jb,op_ja,op_jb,label);
- break;
- case en_ugt:
- gen_compare(node,op_jbe,op_jnc,op_jbe,op_jnc,label);
- break;
- case en_uge:
- gen_compare(node,op_jb,op_ja,op_jb,op_ja,label);
- break;
- case en_land:
- falsejp(node->v.p[0],label);
- falsejp(node->v.p[1],label);
- break;
- case en_lor:
- lab0 = nextlabel++;
- truejp(node->v.p[0],lab0);
- falsejp(node->v.p[1],label);
- gen_label(lab0);
- break;
- case en_not:
- truejp(node->v.p[0],label);
- break;
- default:
- ssize = natural_size(node);
- if (isintconst(node->nodetype)) {
- if (node->v.i == 0)
- gen_code(op_jmp,0,make_label(label),0);
- break;
- }
- else
- if (ssize > 4) {
- ap1 = gen_expr(node,F_FREG | F_VOL, ssize);
- }
- else
- ap1 = gen_expr(node,F_ALL,ssize);
- if (ssize > 4) {
- gen_codef(op_fldz,0,0,0);
- gen_codef(op_fcompp,0,0,0);
- if (regs[0])
- gen_push(EAX,am_dreg,0);
- gen_codef(op_fstsw,2,makedreg(EAX),0);
- gen_codef(op_fwait,0,0,0);
- gen_code(op_sahf,0,0,0);
- if (regs[0])
- gen_pop(EAX,am_dreg,0);
- }
- else {
- if (ap1->mode == am_dreg)
- gen_code(op_or,ssize,ap1,ap1);
- else
- gen_code(op_test,ssize,ap1,make_immedt(0xffffffffL,ssize));
- freeop(ap1);
- }
- gen_branch(op_je,0,make_label(label));
- break;
- }
- }