/* Micro-C Code Generatation Part for intel386 */
#define EXTERN extern
#include "mc.h"
#define REGISTERS6 0
void code_init();
void free_register();
void emit_init();
void emit_push();
void gexpr();
void g_expr();
void bexpr();
void b_expr();
void string();
void function();
void machinop();
void rindirect();
void assign();
void assop();
void oprt_assop();
void oprt_assop_reg();
void oprt();
void oprt1();
void oprt_div();
void asld();
void tosop();
char *div_setup() ;
void div_cleanup() ;
void shift() ;
void shift_1() ;
void lddim() ;
void ldx();
void ld_indexx();
void st_indexx();
void ld_index();
void st_index();
void indexy();
void ld_indir();
void cmpdimm();
void global_table() ;
void local_table() ;
void opening();
void closing();
void gen_gdecl() ;
void jmp_label();
void jmp_eq_label();
void rexpr();
void jcond();
void jmp();
void def_label() ;
void gen_comment();
void gen_source();
void enter() ;
void enter1() ;
void ret();
void emit_data();
void text_mode();
void data_mode();
int cadr();
int car();
int caddr();
int fwdlabel();
void fwddef();
int cadddr();
int backdef();
int simpop();
int simpop_mul();
int simpoperand();
int error();
int size();
int list3();
void increment();
void asrd();
void andd();
#define TEXT_EMIT_MODE 0
#define DATA_EMIT_MODE 1
static output_mode = TEXT_EMIT_MODE;
static data_alignment = 0;
/*
local1 <----24 local variable
%esi -20 <- disp_offset
%edi -16
%edx -12
%ecx -8
%ebx -4
%ebp = %esp 0
%eip 4 <- arg_offset
arg1 8
see enter/enter1/leave
*/
int arg_offset = 4;
int disp_offset = -20;
int int_size = 4;
int endian = 0;
int MAX_REGISTER=6; /* intel386のレジスタが6つということ*/
int MAX_DATA_REG=4;
int MAX_POINTER=3;
static int creg; /* current register */
static char *crn; /* current register name */
static int lreg; /* operand register */
static char *lrn; /* operand register name */
static int dreg; /* temporary register */
static char *drn; /* temporary register name */
static int xreg; /* emit_poped register */
/*
static char *xrn; pointer register name
*/
static int reg_sp; /* REGister Stack-Pointer */
#define REG_EAX 0
#define REG_ECX 1
#define REG_EDX 2
#define REG_EBX 3
#define REG_ESI 4
#define REG_EDI 5
#define REG_EBP 6
#define REG_ESP 7
#define DATA_REG 0
#define POINTER_REG 3
static char *reg_name[8];
static char *reg_name_l[4];
/*
creg currrent virtual register
lreg operand virtual register
dreg spare virtual register
rname[creg] currrent real register
rname[lreg] operand real register
rname[dreg] spare real register
regs[] virtual register usage
reg_name[rname[creg]]
*/
#define MAX_MAX 10
static char rname[MAX_MAX];
static char regs[MAX_MAX]; /* 使われているレジスタを示すフラグ */
static char reg_stack[MAX_MAX]; /* 実際のレジスタの領域 */
void
code_init()
{
if (REGISTERS6) {
arg_offset = 4;
disp_offset = -20;
int_size = 4;
endian = 0;
MAX_REGISTER=6;
MAX_DATA_REG=4;
MAX_POINTER=3;
} else {
arg_offset = 4;
disp_offset = -12;
int_size = 4;
endian = 0;
MAX_REGISTER=4;
MAX_DATA_REG=4;
MAX_POINTER=1;
}
reg_name[REG_EAX] = "%eax";
reg_name[REG_EBX] = "%ebx";
reg_name[REG_ECX] = "%ecx";
reg_name[REG_EDX] = "%edx";
reg_name[REG_ESI] = "%esi";
reg_name[REG_EDI] = "%edi";
reg_name[REG_EBP] = "%ebp";
reg_name[REG_ESP] = "%esp";
reg_name_l[REG_EAX] = "%al";
reg_name_l[REG_EBX] = "%bl";
reg_name_l[REG_ECX] = "%cl";
reg_name_l[REG_EDX] = "%dl";
}
char *
regster(i)
{
return reg_name[rname[i]];
}
int
get_register() { /* 使われていないレジスタを調べる */
int i;
for(i=0;i<MAX_REGISTER;i++) {
if (! regs[i]) { /* 使われていないなら */
regs[i]=1; /* そのレジスタを使うことを宣言し */
return i; /* その場所を表す番号を返す */
}
}
return -1; /* 空いている場所がないなら、それを表す -1 を返す */
}
void
free_register(i) { /* いらなくなったレジスタを開放 */
regs[i]=0;
}
int
register_full()
{
int i;
for(i=0;i<MAX_REGISTER;i++) {
if (! regs[i]) {
return 0;
}
}
return 1;
}
void
emit_init() {
int i;
for(i=0;i<MAX_REGISTER;i++) regs[i]=0;
for(i=0;i<MAX_REGISTER;i++) rname[i]=i;
creg = get_register();
xreg = dreg = get_register();
crn = reg_name[rname[creg]];
drn = reg_name[rname[dreg]];
reg_sp = 0;
text_mode();
}
void
set_crn(i)
int i;
{
creg = i;
crn = reg_name[rname[creg]];
}
void
set_drn(i)
int i;
{
dreg = i;
drn = reg_name[rname[dreg]];
}
void
change(reg1,reg2)
int reg1,reg2;
{
int tmp;
/* Change role of two register
No copy happens. Name change only */
tmp = rname[reg1];
rname[reg1] = rname[reg2];
rname[reg2] = tmp;
crn = reg_name[rname[creg]];
drn = reg_name[rname[dreg]];
lrn = reg_name[rname[lreg]];
}
virtual(real)
int real;
{
int real_v,i;
real_v = -1;
for(i=0;i<MAX_REGISTER;i++) {
if (rname[i]==real) {
real_v=i;
break;
}
}
if (real_v == -1)
error(-1);
return real_v;
}
void
use_register(virt,real,move)
int virt,real,move;
{
int i,k,real_v;
char *move_op;
if (rname[virt]==real)
return;
real_v = virtual(real);
move_op = regs[real_v]?"\txchg %s,%s\n":"\tmovl %s,%s\n";
if (move || regs[real_v]) {
printf(move_op,reg_name[rname[virt]],reg_name[real]);
}
rname[real_v] = rname[virt];
rname[virt] = real;
crn = reg_name[rname[creg]];
drn = reg_name[rname[dreg]];
lrn = reg_name[rname[lreg]];
}
void
use_pointer(virt,move)
int virt,move;
{
int i;
if (rname[virt]>=POINTER_REG)
return;
for(i=POINTER_REG;i<MAX_REGISTER;i++) {
if (!regs[virtual(i)]) {
use_register(virt,i,move);
return;
}
}
/* we prefer EBX */
use_register(virt,REG_EBX,move);
}
void
use_data_reg(virt,move)
int virt,move;
{
int i;
if (rname[virt]<MAX_DATA_REG)
return;
for(i=0;i<MAX_DATA_REG;i++) {
if (!regs[virtual(i)]) {
use_register(virt,i,move);
return;
}
}
/* we prefer EBX */
use_register(virt,REG_EBX,move);
}
int
pop_register() { /* レジスタから値を取り出す */
int i,j;
j = creg;
i = reg_stack[--reg_sp];
if(i<0) {
return i;
} else {
lreg = i;
lrn = reg_name[rname[lreg]];
regs[i]=0;
return lreg;
}
}
int
stack_used() {
return reg_stack[--reg_sp]<0;
}
void
emit_push()
{
int new_reg;
new_reg = get_register();
if(new_reg<0) { /* もうレジスタがない */
reg_stack[reg_sp++] = -1;
printf("\tpushl %s\n",crn);
} else {
reg_stack[reg_sp++] = creg; /* push するかわりにレジスタを使う */
set_crn(new_reg);
}
}
char *
emit_pop(type)
int type;
{
char *xrn;
if (pop_register()==-1) {
if (type==POINTER_REG)
use_pointer(dreg,0);
else if (type==DATA_REG)
use_data_reg(dreg,0);
printf("\tpopl %s\n",drn);
xrn = drn; xreg = dreg;
} else {
xrn = lrn; xreg = lreg;
}
return xrn;
}
void
gexpr(e1)
int e1;
{
emit_init();
if (debug && lsrc)
tree_print(e1);
g_expr(e1);
csvalue = rname[creg]; /* for siwtch value */
}
void
g_expr(e1)
int e1;
{
int e2,e3,e4;
char *xrn;
if (chk) return;
e2 = cadr(e1);
switch (car(e1)){
case GVAR:
/* use_pointer(creg,0); */
printf("\tmovl $%s,%s\n",caddr(e1),crn);
return;
case RGVAR:
/* use_pointer(creg,0); */
printf("\tmovl %s,%s\n",caddr(e1),crn);
return;
case CRGVAR:
printf("\tmovsbl %s,%s\n",caddr(e1),crn);
return;
case LVAR:
/* use_pointer(creg,0); */
printf("\tlea %d(%%ebp),%s\n",e2,crn);
return;
case RLVAR:
printf("\tmovl %d(%%ebp),%s\n",e2,crn);
return;
case CRLVAR:
printf("\tmovsbl %d(%%ebp),%s\n",e2,crn);
return;
case FNAME:
printf("\tmovl $%s,%s\n",((NMTBL *)e2)->nm,crn);
return;
case CONST: /* 代入する値が0でも特別な処理はしない */
printf("\tmovl $%d,%s\n",e2,crn);
return;
case STRING:
string(e1);
return;
case FUNCTION:
function(e1);
return;
case INDIRECT:
g_expr(e2);
return;
case RINDIRECT: case CRINDIRECT:
rindirect(e1);
return;
case ADDRESS:
g_expr(e2);
return;
case MINUS: /* レジスタに対し、neglを実行すれば実現可能 */
g_expr(e2);
/* use_data_reg(creg,1); */
printf("\tnegl %s\n", crn);
return;
case BNOT: /* ~ */
g_expr(e2);
/* use_data_reg(creg,1); */
printf("\tnotl %s\n", crn);
return;
case LNOT: /* ! */
g_expr(e2);
use_data_reg(creg,1);
printf("\tcmpl $0,%s\n", crn);
printf("\tsete %s\n", reg_name_l[rname[creg]]);
printf("\tmovzbl %s,%s\n", reg_name_l[rname[creg]],crn);
return;
case PREINC:
switch (car(e2)) {
case GVAR:
e3 = caddr(e2);
increment(e2,caddr(e1));
printf("\tmovl %s,%s\n",e3,crn);
return;
case LVAR:
e3 = cadr(e2);
increment(e2,caddr(e1));
printf("\tmovl %d(%%ebp),%s\n",e3,crn);
return;
default:
g_expr(e2);
if (caddr(e1)==1) {
printf("\tincl (%s)\n",crn);
printf("\tmovl (%s),%s\n",crn,crn);
return;
}
printf("\taddl $%d,(%s)\n",caddr(e1),crn);
printf("\tmovl (%s),%s\n",crn,crn);
return;
}
case POSTINC:
switch (car(e2)) {
case GVAR:
printf("\tmovl %s,%s\n",caddr(e2),crn);
increment(e2,caddr(e1));
return;
case LVAR:
printf("\tmovl %d(%%ebp),%s\n",cadr(e2),crn);
increment(e2,caddr(e1));
return;
default:
g_expr(e2);
emit_push();
xrn = emit_pop(0);
printf("\tmovl (%s),%s\n",xrn,crn);
if (caddr(e1)==1) {
printf("\tincl (%s)\n",xrn);
return;
}
printf("\taddl $%d,(%s)\n",caddr(e1),xrn);
return;
}
case CPOSTINC:
/* char *p; *p++ */
emit_push();
g_expr(e2);
xrn = emit_pop(0);
printf("\tmovsbl (%s),%s\n",xrn,crn);
printf("\tincl (%s)\n",xrn);
return;
case CPREINC:
g_expr(e2);
printf("\tincl (%s)\n",crn);
printf("\tmovsbl (%s),%s\n",crn,crn);
return;
case CPOSTDEC:
g_expr(e2);
printf("\tmovsbl (%s),%s\n",crn,crn);
printf("\tdecl (%s)\n",crn);
return;
case CPREDEC:
emit_push();
g_expr(e2);
xrn = emit_pop(0);
printf("\tdecl (%s)\n",xrn);
printf("\tmovsbl (%s),%s\n",xrn,crn);
return;
case MUL: case UMUL:
if (car(e3=caddr(e1)) == CONST) {
if (0 < (e3 = cadr(e3)) && e3 <= 10) {
g_expr(e2);
switch (e3) {
case 8: asld(3); return;
case 4: asld(2); return;
case 2: asld(1); return;
case 1: return;
case 10: asld(1);
case 5:
printf("\tmovl %s,%s\n",crn,drn);
asld(2);
printf("\taddl %s,%s\n",drn,crn);
return;
case 6: asld(1);
case 3:
printf("\tmovl %s,%s\n",crn,drn);
asld(1);
printf("\taddl %s,%s\n",drn,crn);
return;
case 9: case 7:
printf("\tmovl %s,%s\n",crn,drn);
asld(3);
if (e3 == 9)
printf("\taddl %s,%s\n",drn,crn);
else
printf("\tsubl %s,%s\n",drn,crn);
return;
}
}
}
machinop(e1);
return;
case DIV: case UDIV:
if (car(e3=caddr(e1)) == CONST) {
switch (cadr(e3)) {
case 32:e4=5;break;
case 16:e4=4;break;
case 8:e4=3;break;
case 4:e4=2;break;
case 2:e4=1;break;
case 1:e4=0;break;
default: machinop(e1);return;
}
g_expr(e2);
asrd(car(e1),e4);
return;
}
machinop(e1);
return;
case MOD:
case UMOD:
if (car(e3=caddr(e1)) == CONST) {
switch (e3) {
case 32:g_expr(e2); andd(0x1f);return;
case 16:g_expr(e2); andd(0xf); return;
case 8 :g_expr(e2); andd(0x7); return;
case 4 :g_expr(e2); andd(0x3); return;
case 2 :g_expr(e2); andd(0x1); return;
case 1 :g_expr(e2); andd(0x0); return;
}
}
machinop(e1);
return;
case LSHIFT: case ULSHIFT: case RSHIFT: case URSHIFT:
case ADD: case SUB: case BAND: case EOR: case BOR:
machinop(e1);
return;
case COND:
e2=fwdlabel();
b_expr(cadr(e1),0,e2);
g_expr(caddr(e1));
e4 = rname[creg];
jmp(e3=fwdlabel());
fwddef(e2);
g_expr(cadddr(e1));
use_register(creg,e4,1);
fwddef(e3);
return;
case ASS: case CASS:
assign(e1);
return;
case ASSOP: case CASSOP:
assop(e1);
return;
case COMMA:
g_expr(e2);
g_expr(caddr(e1));
return;
default:
b_expr(e1,1,e2=fwdlabel()); /* including > < ... */
printf("\txorl %s,%s\n",crn,crn);
jmp(e3=fwdlabel());
fwddef(e2);
printf("\tmovl $1,%s\n",crn);
fwddef(e3);
}
}
void
bexpr(e1,cond,l1)
int e1,l1;
char cond;
{
emit_init();
b_expr(e1,cond,l1);
}
void
b_expr(e1,cond,l1)
int e1,l1;
char cond;
{
int e2,l2;
if (chk) return;
e2=cadr(e1);
switch(car(e1)) {
case LNOT:
b_expr(e2,!cond,l1);
return;
case GT:
rexpr(e1,l1,cond?"g":"le");
return;
case UGT:
rexpr(e1,l1,cond?"a":"be");
return;
case GE:
rexpr(e1,l1,cond?"ge":"l");
return;
case UGE:
rexpr(e1,l1,cond?"ae":"b");
return;
case LT:
rexpr(e1,l1,cond?"l":"ge");
return;
case ULT:
rexpr(e1,l1,cond?"b":"ae");
return;
case LE:
rexpr(e1,l1,cond?"le":"g");
return;
case ULE:
rexpr(e1,l1,cond?"be":"a");
return;
case EQ:
rexpr(e1,l1,cond?"e":"ne");
return;
case NEQ:
rexpr(e1,l1,cond?"ne":"e");
return;
case LAND:
b_expr(e2,0,cond?(l2=fwdlabel()):l1);
b_expr(caddr(e1),cond,l1);
if(cond) fwddef(l2);
return;
case LOR:
b_expr(e2,1,cond?l1:(l2=fwdlabel()));
b_expr(caddr(e1),cond,l1);
if(!cond) fwddef(l2);
return;
case CRGVAR:
printf("\tcmpb $0,%s\n",caddr(e1));
jcond(l1,cond);
return;
case CRLVAR:
printf("\tcmpb $0,%d(%%ebp)\n",e2);
jcond(l1,cond);
return;
case RGVAR:
printf("\tcmpl $0,%s\n",caddr(e1));
jcond(l1,cond);
return;
case RLVAR:
printf("\tcmpl $0,%d(%%ebp)\n",e2);
jcond(l1,cond);
return;
case CONST:
if((cond&&e2)||(!cond&&!e2)) jmp(l1);
return;
default:
g_expr(e1);
printf("\tcmpl $0,%s\n",crn);
jcond(l1,cond);
return;
}
}
void
ascii(s)
char *s;
{
printf("\t.ascii \"");
while(*s) {
if (*s=='\n')
printf("%cn",92);
else if (*s<' ')
printf("%c%03o",92,*s);
else if (*s==34)
printf("%c%c",92,34);
else
printf("%c",*s);
s++;
}
printf("%c%c%c\n",92,'0',34);
}
void
string(e1)
int e1;
{
char *s;
int i,lb;
if (0) {
s=(char *)cadr(e1);
lb=fwdlabel();
printf("\tjmp _%d\n",lb);
i=backdef();
ascii(s);
printf("\t.align 2\n");
fwddef(lb);
printf("\tlea _%d,%s\n",i,crn);
} else {
s=(char *)cadr(e1);
printf(".section\t.rodata\n");
lb=fwdlabel();
printf("_%d:\n",lb);
ascii(s);
if (output_mode==TEXT_EMIT_MODE) {
printf(".text\n");
} else {
text_mode();
}
printf("\tlea _%d,%s\n",lb,crn);
}
}
void
function(e1)
int e1;
{
int e2,e3,e4,e5,nargs;
NMTBL *n;
e2 = cadr(e1);
nargs = 0;
for (e3 = caddr(e1); e3; e3 = cadr(e3)) {
n=(NMTBL *)(e5=(cadr(e4 = car(e3))));
switch(car(e4)) {
case FNAME:
printf("\tlea $%s,%s\n",n->nm,crn);
printf("\tpushl %s\n",crn);
break;
case ADDRESS:
g_expr(e5);
printf("\tpushl %s\n",crn);
break;
default:g_expr(e4);
printf("\tpushl %s\n",crn);
}
++nargs;
}
if (car(e2) == FNAME) {
n=(NMTBL *)cadr(e2);
use_register(creg,REG_EAX,0);
printf("\tcall\t%s\n",n->nm);
} else {
g_expr(e2);
use_register(creg,REG_EAX,0);
printf("\tcall\t*%s\n",crn);
}
if (nargs) printf("\taddl $%d,%%esp\n",4*nargs);
}
void
machinop(e1)
int e1;
{
int e2,e3,op;
e2 = cadr(e1);
op = car(e1);
switch (car(e3 = caddr(e1))) {
case RGVAR: case RLVAR: case CONST:
g_expr(e2);
if (simpop(op))
oprt(op,e3);
else
oprt_div(op,e3);
return;
default:
g_expr(e3);
emit_push();
g_expr(e2);
tosop(car(e1));
return;
}
}
void
increment(e,inc)
int e,inc;
{
if (inc==1) {
if (car(e)==GVAR)
printf("\tincl %s\n",caddr(e));
else
printf("\tincl %d(%%ebp)\n",cadr(e));
} else {
if (car(e)==GVAR)
printf("\taddl $%d,%s\n",inc,caddr(e));
else
printf("\taddl $%d,%d(%%ebp)\n",inc,cadr(e));
}
}
void
rindirect(e1) /* *(p +5 ) */
int e1;
{
char *op,*xrn;
int e2,e3,e4,e5,byte,l;
op = ((byte = (car(e1) == CRINDIRECT)) ? "movsbl" : "movl");
e3 = cadr(e2 = cadr(e1));
switch (car(e2)) {
case RGVAR:
/* movl _i,%esi
movsbl (%esi),%eax */
printf("\tmovl %s,%s\n",caddr(e2),drn);
printf("\t%s (%s),%s\n",op,drn,crn);
return;
case RLVAR:
/* movl -6(%ebp),%esi
movsbl (%esi),%eax */
printf("\tmovl %d(%%ebp),%s\n",cadr(e2),drn);
printf("\t%s (%s),%s\n",op,drn,crn);
return;
case ADD:
/* movsbl (%esi+%eax),%eax */
e4=caddr(e2);
if(car(e3)==ADDRESS) {
e3 = cadr(e3);
}
if (e5=e4,doubleindex(&e5)) { /* *((int *)q+i+j) =3 */
g_expr(e3);
emit_push();
g_expr(cadr(e4));
xrn = emit_pop();
printf("\t%s (%s,%s,%d),%s\n",op,xrn,crn,e5,crn);
return;
} else if (e5=e3,doubleindex(&e5)) {
g_expr(e4);
emit_push();
g_expr(cadr(e3));
xrn = emit_pop();
printf("\t%s (%s,%s,%d),%s\n",op,xrn,crn,e5,crn);
return;
}
switch(car(e4)) { /* *(p+3) */
case RGVAR:
/* movl _i,%esi
movsbl (%esi+%eax),%eax */
g_expr(e3);
printf("\tmovl %s,%s\n",caddr(e4),drn);
printf("\t%s (%s,%s),%s\n",op,crn,drn,crn);
return;
case RLVAR:
/* movl -6(%ebp),%esi
movsbl (%esi+%eax),%eax */
g_expr(e3);
printf("\tmovl %d(%%ebp),%s\n",cadr(e4),drn);
printf("\t%s (%s,%s),%s\n",op,crn,drn,crn);
return;
case CONST:
switch (car(e3)) { /* *(1+xx) */
case RGVAR:
printf("\tmovl %s,%s\n",caddr(e3),drn);
printf("\t%s %d(%s),%s\n",op,cadr(e4),drn,crn);
return;
case RLVAR:
/* movl -6(%ebp),%esi
movsbl 12(%esi),%eax */
printf("\tmovl %d(%%ebp),%s\n",cadr(e3),drn);
printf("\t%s %d(%s),%s\n",op,cadr(e4),drn,crn);
return;
}
default:
g_expr(e3);
emit_push();
g_expr(e4);
xrn = emit_pop(0);
printf("\t%s (%s,%s),%s\n",op,crn,xrn,crn);
return;
}
case PREINC:
/* *++p */
switch (car(e3)) {
case GVAR:
increment(e3,caddr(e2));
printf("\tmovl %s,%s\n",caddr(e3),drn);
printf("\t%s (%s),%s\n",op,drn,crn);
return;
case LVAR:
increment(e3,caddr(e2));
printf("\tmovl %d(%%ebp),%s\n",cadr(e3),drn);
printf("\t%s (%s),%s\n",op,drn,crn);
return;
}
break;
case POSTINC:
/* *p++ */
switch (car(e3)) {
case GVAR:
printf("\tmovl %s,%s\n",caddr(e3),drn);
increment(e3,caddr(e2));
printf("\t%s (%s),%s\n",op,drn,crn);
return;
case LVAR:
printf("\tmovl %d(%%ebp),%s\n",cadr(e3),drn);
increment(e3,caddr(e2));
printf("\t%s (%s),%s\n",op,drn,crn);
return;
}
}
g_expr(e2);
printf("\t%s (%s),%s\n",op,crn,crn);
}
void
assign(e1)
int e1;
{
char *op;
int e2,e3,e4,e5,l,byte;
char *inc,*xrn,*xrn1;
op = ((byte=(car(e1) == CASS))? "movb" : "movl");
e2 = cadr(e1);
e3 = cadr(e2);
e4 = caddr(e1);
switch(car(e2)) {
case GVAR: /* i=3 */
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\t%s %s,%s\n",op,crn,caddr(e2));
return;
case LVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\t%s %s,%d(%%ebp)\n",op,crn,cadr(e2));
return;
case INDIRECT: /* *i = 3 */
switch(car(e3)) {
case RGVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\tmovl %s,%s\n",caddr(e3),drn);
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
case RLVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\tmovl %d(%%ebp),%s\n",cadr(e3),drn);
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
case ADD:/* i[3] = 3 */
if (car(e5=caddr(e3)) == CONST) {
switch (car(e5=cadr(e3))) {
case RGVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\tmovl %s,%s\n",caddr(e5),drn);
printf("\t%s %s,%d(%s)\n",op,crn,cadr(caddr(e3)),drn);
return;
case RLVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\tmovl %d(%%ebp),%s\n",cadr(e5),drn);
printf("\t%s %s,%d(%s)\n",op,crn,cadr(caddr(e3)),drn);
return;
}
} else if (doubleindex(&e5)) {
/* indirect add address (mul expr const)=value*/
/* e3 e5 e4 */
g_expr(e4); /* assign value */
/* dindex(op,address,suffix,multi,byte) */
dindex(op,cadr(e3),cadr(caddr(e3)),e5,byte);
return;
} else if (e5=cadr(e3),doubleindex(&e5)) {
g_expr(e4); /* assign value */
/* dindex(op,address,suffix,multi,byte) */
dindex(op,caddr(e3),cadr(cadr(e3)),e5,byte);
return;
}
break;
case PREINC:/* *++i = 3 */
if ((l = caddr(e3)) == -1 || l == 1) {
inc = l==1?"incl":"decl";
switch (car(e5=cadr(e3))) {
case GVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\t%s %s\n",inc,caddr(e5));
printf("\tmovl %s,%s\n",caddr(e5),drn);
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
case LVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\t%s %d(%%ebp)\n",inc,cadr(e5));
printf("\tmovl %d(%%ebp),%s\n",cadr(e5),drn);
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
}
} else {
switch (car(e5=cadr(e3))) {
case GVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\taddl $%d,%s\n",l,caddr(e5));
printf("\tmovl %s,%s\n",caddr(e5),drn);
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
case LVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\taddl $%d,%d(%%ebp)\n",l,cadr(e5));
printf("\tmovl %d(%%ebp),%s\n",cadr(e5),drn);
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
}
}
break;
case POSTINC:/* *i++ = 3 */
if ((l = caddr(e3)) == -1 || l == 1) {
inc = l==1?"incl":"decl";
switch (car(e5=cadr(e3))) {
case GVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\tmovl %s,%s\n",caddr(e5),drn);
printf("\t%s %s\n",inc,caddr(e5));
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
case LVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\tmovl %d(%%ebp),%s\n",cadr(e5),drn);
printf("\t%s %d(%%ebp)\n",inc,cadr(e5));
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
}
} else {
switch (car(e5=cadr(e3))) {
case GVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\tmovl %s,%s\n",caddr(e5),drn);
printf("\taddl $%d,%s\n",l,caddr(e5));
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
case LVAR:
g_expr(e4);
if (byte) use_data_reg(creg,1);
printf("\tmovl %d(%%ebp),%s\n",cadr(e5),drn);
printf("\taddl $%d,%d(%%ebp)\n",l,cadr(e5));
printf("\t%s %s,(%s)\n",op,crn,drn);
return;
}
}
break;
}
}
g_expr(e4);
emit_push();
g_expr(e2);
if(car(e4)==CONST) {
printf("\t%s $%d,(%s)\n",op,cadr(e4),crn);
return;
}
if (byte) use_data_reg(creg,1);
xrn = emit_pop(0);
printf("\t%s %s,(%s)\n",op,xrn,crn);
change(creg,xreg); /* now xrn becomes crn */
return;
}
void
assop(e1)
int e1;
{
int e2,e3,e4,e5,byte,op;
char *xrn;
/* e2 op= e3 */
byte = (car(e1) == CASSOP);
e2 = cadr(e1);
if (car(e2)==INDIRECT) e2=cadr(e2);
e3 = caddr(e1);
op = cadddr(e1);
switch (car(e2)) {
case GVAR: case LVAR:
if(car(e3)==CONST) {
if (simpop(op)) {
oprt_assop(op,byte,e3,e2);
} else {
use_register(creg,REG_EAX,0);
ld_index(byte,e2);
oprt_div(op,e3);
st_index(byte,e2);
}
return;
} else {
if (simpop(op)) {
g_expr(e3);
oprt_assop_reg(op,byte,crn,e2);
} else {
g_expr(e3);
emit_push();
ld_index(byte,e2);
tosop(op);
st_index(byte,e2);
}
return;
}
case ADD:
if (simpop(op)) {
if (car(e3)==CONST) {
if(car((e4=caddr(e2)))==CONST) {
/* a[const] += const */
g_expr(cadr(e2));
/* oprt1(op,byte,e,ind,disp,reg); */
oprt1(op,byte,e3,1,cadr(e4),0);
return;
} else if (e5=e4,doubleindex(&e5)) {
/* indirect add address (mul expr const)op=const*/
oprt1(op,byte,e3,5,list3(cadr(e2),cadr(e4),e5),0);
return;
} else if (e5=cadr(e2),doubleindex(&e5)) {
/* indirect add address (mul expr const)op=const*/
oprt1(op,byte,e3,5,list3(e4,cadr(cadr(e2)),e5),0);
return;
} else {
/* a[expr] += const */
g_expr(e4);
emit_push();
g_expr(cadr(e2));
/* oprt1(op,byte,e,ind,disp,reg); */
oprt1(op,byte,e3,2,0,0);
return;
}
} else {
if(car((e4=caddr(e2)))==CONST) {
/* a[const] += value */
g_expr(e3);
emit_push();
g_expr(cadr(e2));
xrn = emit_pop();
/* oprt1(op,byte,e,ind,disp,reg); */
oprt1(op,byte,e3,1,cadr(e4),xrn);
return;
} else if (e5=e4,doubleindex(&e5)) {
g_expr(e3);
/* indirect add address (mul expr const)op=const*/
oprt1(op,byte,e3,5,list3(cadr(e2),cadr(e4),e5),0);
return;
} else if (e5=cadr(e2),doubleindex(&e5)) {
g_expr(e3);
/* indirect add address (mul expr const)op=const*/
oprt1(op,byte,e3,5,list3(e4,cadr(cadr(e2)),e5),0);
return;
} else {
/* a[value] += value */
g_expr(e3);
emit_push();
g_expr(e4);
emit_push();
g_expr(cadr(e2));
xrn = emit_pop();
/* oprt1(op,byte,e,ind,disp,reg) */
oprt1(op,byte,e3,2,0,xrn);
return;
}
}
}
default:
if (simpop(op)) {
if (car(e3)==CONST) {
/* *(complex e2) += const */
g_expr(e2);
/* oprt1(op,byte,e,ind,disp,reg) */
oprt1(op,byte,e3,1,0,0);
return;
} else {
/* *(complex e2) += value */
g_expr(e3);
emit_push();
g_expr(e2);
xrn = emit_pop();
/* oprt1(op,byte,e,ind,disp,reg) */
oprt1(op,byte,e3,3,0,xrn);
return;
}
}
if (op==UMUL||op==MUL) {
/* e2 op= e3 */
if (car(e3)==CONST) {
/* *(complex e2) *= const */
g_expr(e2);
printf("\timul%c $%d,(%s),%s\n",byte?'b':'l',cadr(e3),crn,crn);
st_indexx(byte,0,crn);
return;
} else {
/* *(complex e2) *= value */
g_expr(e3);
emit_push();
g_expr(e2);
xrn = emit_pop();
printf("\timul%c (%s),%s\n",byte?'b':'l',crn,xrn);
st_indexx(byte,0,crn);
return;
}
}
/* divie case */
switch (car(e3)) {
case RGVAR: case RLVAR: case CONST:
g_expr(e2);
xrn = crn;
emit_push();
ld_indexx(byte,0,xrn);
if (simpop(op)) {
oprt(op,e3);
} else {
oprt_div(op,e3);
}
xrn = emit_pop();
st_indexx(byte,0,xrn);
break;
default:
g_expr(e3);
emit_push();
g_expr(e2);
emit_push();
xrn = emit_pop();
ld_indexx(byte,0,xrn);
tosop(op);
emit_push();
/* we prefer compute e3 before e2 but this is slightly difficult */
/* with out computing e2 twice, sine xrn might be lost */
/* but cleary compile e2 twice is wrong */
g_expr(e2);
xrn = emit_pop();
printf("\t%s %s,(%s)\n",byte ? "movb" : "movl",xrn,crn);
change(creg,xreg);
return;
}
}
}
int
simpop(op)
int op;
{
return (op == ADD || op == SUB ||
op == BAND || op == EOR || op == BOR || op == LNOT ||
op == LSHIFT || op == ULSHIFT ||
op == RSHIFT || op==URSHIFT);
}
int
simpop_mul(op)
int op;
{
return (op == ADD || op == SUB ||
op == BAND || op == EOR || op == BOR || op == LNOT ||
op == LSHIFT || op == ULSHIFT ||
op == RSHIFT || op==URSHIFT);
}
int
doubleindex(e5)
int *e5;
{
int e;
if (car(e=*e5)==MUL)
/* mul expr const */
if (car(e=caddr(e))==CONST)
if((e=cadr(e))==2 || e==4 || e==8) {
*e5 = e;
return 1;
}
return 0;
}
void
oprt1(op,byte,e,ind,disp,reg)
int op,byte,e,ind,disp;
char *reg;
{
char *xrn,*xrn1,*shift,b;
int use,xreg,xreg1;
if (ind==2) {
if (reg) {
xreg = lreg;
xrn = emit_pop(); /* pop offset */
xrn1 = reg; reg = xrn; xrn = xrn1;
} else {
xrn = emit_pop(); /* pop value */
xreg = lreg;
}
} else if (ind==5||ind==6) {
emit_push();
g_expr(cadr(disp)); /* suffix */
emit_push();
g_expr(car(disp)); /* address */
xrn = emit_pop(); /* suffix */
xreg = lreg;
if (use=stack_used()) {
/* dreg (=xrn) may lost if expr use stack */
printf("\tlea (%s,%s,%d),%s\n",crn,xrn,caddr(disp),crn);
xrn = emit_pop(); /* value */
xreg = lreg;
} else {
xrn1 = emit_pop(); /* value */
xreg1 = lreg;
}
} else if (ind==7) {
xrn = reg;
}
b = byte?'b':'l';
switch (op) {
case LSHIFT:
case ULSHIFT:
shift = "sal";
goto shift_case;
case RSHIFT:
shift = "sar";
goto shift_case;
case URSHIFT:
shift = "shr";
shift_case:
if (ind==5||ind==6) {
if (car(e)==CONST) {
if (use) {
printf("\t%s%c $%d,(%s)\n",shift,b,cadr(e),crn);
if (byte) use_data_reg(creg,1);
printf("\t%s (%s),%s\n",
b=='b'?"movsbl":"movl", crn,crn);
} else {
printf("\t%s%c $%d,(%s,%s,%d)\n",shift,b,
cadr(e),crn,xrn,caddr(disp));
if (byte) use_data_reg(creg,1);
printf("\t%s (%s,%s,%d),%s\n",
b=='b'?"movsbl":"movl", crn,xrn,caddr(disp),crn);
creg = lreg; crn = lrn;
}
return;
}
if (use) {
use_register(xreg,REG_ECX,0);
printf("\t%s%c %s,(%s)\n",shift,b,reg_name_l[REG_ECX],crn);
if (byte) use_data_reg(creg,1);
printf("\t%s (%s),%s\n",
b=='b'?"movsbl":"movl", crn,crn);
} else {
use_register(xreg1,REG_ECX,0);
printf("\t%s%c %s,(%s,%s,%d)\n",shift,b,
reg_name_l[REG_ECX],crn,xrn,caddr(disp));
if (byte) use_data_reg(creg,1);
printf("\t%s (%s,%s,%d),%s\n",
b=='b'?"movsbl":"movl", crn,xrn,caddr(disp),crn);
}
return;
} else {
if (car(e)==CONST) {
printf("\t%s%c $%d,",shift,b,cadr(e));
operand2(ind,disp,xrn,byte,1);
if (byte) use_data_reg(creg,1); /* xrn? */
printf("\t%s ",b=='b'?"movsbl":"movl");
operand2(ind,disp,xrn,byte,0);
printf(",%s\n",crn);
return;
}
use_register(dreg,REG_ECX,0);
printf("\tmovl ");
operand1(reg,e);
printf("%s\n",drn);
printf("\t%s%c %%cl,",shift,b);
operand2(ind,disp,xrn,byte,1);
if (ind) {
if (byte) use_data_reg(creg,1); /* xrn? */
printf("\t%s ",b=='b'?"movsbl":"movl");
operand2(ind,disp,xrn,byte,0);
printf(",%s\n",crn);
}
return;
}
case MUL:
case UMUL:
printf("\t%s%c ",op==MUL?"imul":"imul",b);
break;
case ADD:
printf("\tadd%c ",b);
break;
case SUB:
printf("\tsub%c ",b);
break;
case BAND:
printf("\tand%c ",b);
break;
case EOR:
printf("\txor%c ",b);
break;
case BOR:
printf("\tor%c ",b);
break;
default:
error(-1);
}
if (ind==5||ind==6) {
if (use) {
printf("\t%s,(%s)\n",xrn,crn);
if (byte) use_data_reg(creg,1);
printf("\t%s (%s),%s\n",byte?"movsbl":"movl",xrn,crn);
} else {
printf("\t%s,(%s,%s,%d)\n",xrn1,crn,xrn,caddr(disp));
if (byte) use_data_reg(creg,1);
printf("\t%s (%s,%s,%d),%s\n",byte?"movsbl":"movl",crn,xrn,caddr(disp),crn);
}
} else {
operand1(reg,e);
operand2(ind,disp,xrn,byte,1);
if (ind) {
if (byte) use_data_reg(creg,1); /* xrn? */
printf("\t%s ",b=='b'?"movsbl":"movl");
operand2(ind,disp,xrn,byte,0);
printf(",%s\n",crn);
}
}
}
int
simpoperand(e1)
int e1;
{
return (e1==RGVAR ||e1==RLVAR||e1==CONST);
}
operand1(reg,e)
char *reg;
int e;
{
int e1;
e1 = car(e);
if (reg) {
printf("%s,",reg);
} else if (e1==RGVAR) {
printf("%s,",caddr(e));
} else if (e1==RLVAR) {
printf("%d(%%ebp),",cadr(e));
} else if (e1==CONST) {
printf("$%d,",cadr(e));
} else {
error(-1);
}
}
operand2(ind,disp,reg,byte,nl)
int ind,disp,byte,nl;
char *reg;
{
char *xrn;
if (ind==1 && disp)
printf("%d(%s)",disp,crn);
else if (ind==1 || ind==3)
printf("(%s)",crn);
else if (ind==2) {
printf("(%s,%s)",crn,reg);
} else if (ind==7 || ind==8) {
switch(car(disp)) {
case GVAR:
printf("%s",caddr(disp)); break;
case LVAR:
printf("%d(%%ebp)",cadr(disp)); break;
default:
printf("%s",crn);
if (nl)
printf("\n");
return;
}
} else {
printf("%s",crn);
}
if (nl)
printf("\n");
}
dindex(op,address,suffix,multi,byte)
int op,address,suffix,multi,byte;
{
char *xrn,*xrn1;
emit_push();
g_expr(suffix); /* suffix */
emit_push();
g_expr(address); /* address */
xrn = emit_pop(); /* suffix */
if (stack_used()) {
/* dreg (=xrn) may lost if expr use stack */
printf("\tlea (%s,%s,%d),%s\n",crn,xrn,multi,crn);
xrn = emit_pop(); /* value */
if (byte) use_data_reg(lreg,1);
printf("\t%s %s,(%s)\n",op,xrn,crn);
} else {
xrn1 = emit_pop(); /* value */
if (byte) use_data_reg(lreg,1);
printf("\t%s %s,(%s,%s,%d)\n",op,xrn1,crn,xrn,multi);
}
creg = lreg; crn = lrn;
}
/* simple one operand operation */
void
oprt(op,e)
int op,e;
{
/* oprt1(op,byte,e,ind,disp,reg) */
oprt1(op,0,e,0,0,0,0);
}
void
oprt_assop(op,byte,e1,e2)
int op,byte,e1,e2;
{
/* oprt1(op,byte,e,ind,disp,reg) */
/* op e1,e2 */
oprt1(op,byte,e1,7,e2,0);
}
void
oprt_assop_reg(op,byte,reg,e)
char *reg;
int op,byte,e;
{
/* oprt1(op,byte,e,ind,disp,reg) */
/* op reg,e2 */
oprt1(op,byte,0,7,e,reg);
}
void
oprt_div(op,e)
int op,e;
{
int e1,const_reg,i;
e1 = car(e);
const_reg = -1;
if (op!=MUL && op!=UMUL) {
div_setup(-1);
/* free hands on ECX or ECX? */
if (e1==CONST) {
if(regs[virtual(REG_EBX)]) {
const_reg = REG_ECX;
if (regs[virtual(REG_ECX)]) {
printf("\tpushl %%ecx\n");
}
} else
const_reg = REG_EBX;
printf("\tmovl $%d,%s\n",cadr(e),reg_name[const_reg]);
}
}
switch (op) {
case DIV:
case MOD:
printf("\tcltd\n\tidivl ");
break;
case UDIV:
case UMOD:
printf("\txor %%edx,%%edx\n\tdivl ");
break;
case MUL:
case UMUL:
printf("\timull ");
break;
default:
error(-1);
}
if (e1==RGVAR) {
printf("%s",caddr(e));
} else if (e1==RLVAR) {
printf("%d(%%ebp)",cadr(e));
} else if (e1==CONST) {
if (const_reg!=-1)
printf("%s",reg_name[const_reg]);
else
printf("$%d",cadr(e));
} else {
error(-1);
}
if (op==MUL || op==UMUL) {
printf(",%s\n",crn);
} else {
printf("\n");
}
if(const_reg == REG_ECX && regs[virtual(REG_ECX)])
printf("\tpopl %%ecx\n");
if (op==MOD || op==UMOD) {
rname[creg]=REG_EDX;
crn=reg_name[REG_EDX];
rname[dreg]=REG_EAX;
drn=reg_name[REG_EAX];
}
}
void
asld(d)
int d;
{
printf("\tsall $%d,%s\n",d,crn);
}
void
andd(d)
int d;
{
printf("\tandl $%d,%s\n",d,crn);
}
void
asrd(type,d)
int type;
int d;
{
char *op;
op = type==DIV?"\tsarl $%d,%s\n":"larl $%d,%s\n";
printf(op,d,crn);
}
void
tosop(op)
int op;
{
int oreg;
char *orn;
oreg = pop_register();
switch(op) {
case LSHIFT:
case ULSHIFT:
shift("sall",oreg);
return;
case RSHIFT:
shift("sarl",oreg);
return;
case URSHIFT:
shift("shrl",oreg);
return;
}
if(oreg==-1) {
printf("\tpopl %s\n",drn);
oreg = dreg;
}
orn = reg_name[rname[oreg]];
switch(op) {
case ADD:
printf("\taddl %s,%s\n",orn,crn);
return;
case SUB:
printf("\tsubl %s,%s\n",orn,crn);
return;
case BAND:
printf("\tandl %s,%s\n",orn,crn);
return;
case EOR:
printf("\txorl %s,%s\n",orn,crn);
return;
case BOR:
printf("\torl %s,%s\n",orn,crn);
return;
case MUL:
case UMUL:
/* use_register(dreg,REG_EDX,0); */
printf("\t%s %s,%s\n","imull",orn,crn);
return;
case DIV:
case MOD:
printf("\tcltd\n\tidivl %s\n",div_setup(oreg));
if (op==MOD) change(creg,dreg);
div_cleanup();
break;
case UDIV:
case UMOD:
printf("\txor %%edx,%%edx\n\tidivl %s\n",div_setup(oreg));
if (op==UMOD) change(creg,dreg);
div_cleanup();
break;
}
return;
}
static char *dvi_push = "(%esp)";
char *
div_setup(oreg)
int oreg;
{
if (oreg<0) {
use_register(creg,REG_EAX,1);
use_register(dreg,REG_EDX,0);
return 0;
}
if (register_full()) {
printf("\tpushl %s\n",reg_name[rname[oreg]]);
use_register(creg,REG_EAX,1);
use_register(oreg,REG_EDX,0);
return dvi_push;
}
regs[oreg]=1;
use_register(creg,REG_EAX,1);
use_register(dreg,REG_EDX,0);
regs[oreg]=0;
return reg_name[rname[oreg]];
}
void
div_cleanup(orn)
char *orn;
{
if (orn==dvi_push)
printf("\taddl $4,%%esp\n");
}
void
shift(op,reg)
char *op,*reg;
{
if (reg>=0) {
use_register(lreg,REG_ECX,1);
} else {
use_register(dreg,REG_ECX,0);
printf("\tpopl %%ecx\n");
}
printf("\t%s %%cl,%s\n",op,crn);
}
void
lddim(n) /* modified */
int n;
{
printf("\tmovl $%d,%s\n",n,crn);
}
void
ldx(e)
int e;
{
switch (car(e)) {
case GVAR: case RGVAR:
printf("\tmovl %s,%s\n",caddr(e),crn);
return;
case LVAR: case RLVAR:
printf("\tmovl %d(%%ebp),%s\n",cadr(e),crn);
return;
default:
DEBUG;
}
}
void
stx(e)
int e;
{
switch (car(e)) {
case GVAR: case RGVAR:
printf("\tmovl %s,%s\n",crn,caddr(e));
return;
case LVAR: case RLVAR:
printf("\tmovl %s,%d(%%ebp)\n",crn,cadr(e));
return;
default:
DEBUG;
}
}
void
ld_indexx(byte,n,xrn)
int byte,n;
char *xrn;
{
char *op;
op = byte ? "movsbl" : "movl";
if (n)
printf("\t%s %d(%s),%s\n",op,n,xrn,crn);
else
printf("\t%s (%s),%s\n",op,xrn,crn);
}
void
st_indexx(byte,n,xrn)
int byte,n;
char *xrn;
{
char *op;
op = byte ? "movb" : "movl";
if (n)
printf("\t%s %s,%d(%s)\n",op,crn,n,xrn);
else
printf("\t%s %s,(%s)\n",op,crn,xrn);
}
void
ld_index(byte,e)
int byte,e;
{
char *op;
op = byte ? "movsbl" : "movl";
switch (car(e)) {
case GVAR:
printf("\t%s %s,%s\n",op,caddr(e),crn);
return;
case LVAR:
printf("\t%s %d(%%ebp),%s\n",op,cadr(e),crn);
return;
default:
DEBUG;
}
}
void
st_index(byte,e)
int byte,e;
{
char *op;
op = byte ? "movb" : "movl";
switch (car(e)) {
case GVAR:
printf("\t%s %s,%s\n",op,crn,caddr(e));
return;
case LVAR:
printf("\t%s %s,%d(%%ebp)\n",op,crn,cadr(e));
return;
default:
DEBUG;
}
}
void
indexy(op,gvar)
char *op;
char *gvar;
{
printf("\t%s %s,%s\n",op,crn,gvar);
}
void
ld_indir(op,e)
char *op;
int e;
{
switch (car(e)) {
case RGVAR:
/* indiry(op,cadr(e)); */
printf("\t%s\t(%s),%s\n",op,caddr(e),crn);
return;
case RLVAR:
/* indiru(op,cadr(e)); */
printf("\t%s\t%s(%%epb),%s\n",op,cadr(e),crn);
return;
default:
DEBUG;
}
}
void
cmpdimm(e,csreg)
int e,csreg;
{
use_register(creg,csreg,0);
printf("\tcmpl $%d,%s\n",e,crn);
}
void
opening(filename)
char *filename;
{
printf("\t.file \"%s\"\n",filename);
printf(".text\n");
emit_init();
}
void
closing()
{
global_table();
}
void
jmp_label(l)
int l;
{
printf("\tjmp\t_%d\n",l);
}
void
jmp_eq_label(l)
int l;
{
printf("\tje\t_%d\n",l);
}
void
rexpr(e1,l1,s)
int e1,l1;
char *s;
{
g_expr(list3(SUB,cadr(e1),caddr(e1)));
printf("\tj%s\t_%d\n",s,l1);
}
void
jcond(l,cond)
int l;
char cond;
{
printf("\tj%s\t_%d\n",cond?"ne":"e",l);
}
void
jmp(l)
int l;
{
control=0;
printf("\tjmp\t_%d\n",l);
/* align? */
}
int
fwdlabel()
{
return labelno++;
}
void
fwddef(l)
int l;
{
control=1;
printf("_%d:\n",l);
}
int
backdef()
{
control=1;
printf("_%d:\n",labelno);
return labelno++;
}
void
def_label(cslabel,dlabel)
int cslabel,dlabel;
{
int fl;
fl = 0;
if (control) {
jmp(fl=fwdlabel());
}
fwddef(cslabel);
if (dlabel)
jmp(dlabel);
if (fl) {
fwddef(fl);
}
}
void
gen_comment(s)
char *s;
{
printf("# %s",s);
}
void
gen_source(s)
char *s;
{
printf("%s",s);
}
void
enter(name)
char *name;
{
text_mode();
printf("\t.align 2\n");
if (stmode!=STATIC)
printf(".globl %s\n",name);
printf("%s:\n",name);
printf("\t.type\t%s,@function\n",name);
printf("\tpushl %%ebp\n");
printf("\tmovl %%esp,%%ebp\n");
printf("\tpushl %%ebx\n");
printf("\tpushl %%ecx\n");
printf("\tpushl %%edx\n");
if (REGISTERS6) {
printf("\tpushl %%edi\n");
printf("\tpushl %%esi\n");
}
}
void
enter1(disp)
int disp;
{
if(disp) printf("\tsubl $%d,%%esp\n",-disp);
}
void
leave(control,name)
int control;
char *name;
{
fwddef(retlabel);
use_register(creg,REG_EAX,1);
if (REGISTERS6) {
printf("\tpopl %%esi\n");
printf("\tpopl %%edi\n");
}
if(disp) printf("\taddl $%d,%%esp\n",-disp);
printf("\tpopl %%edx\n");
printf("\tpopl %%ecx\n");
printf("\tpopl %%ebx\n");
printf("\tleave\n");
printf("\tret\n");
local_table();
printf("_%d:\n",labelno);
printf("\t.size\t%s,_%d-%s\n",name,labelno,name);
labelno++;
}
void
ret()
{
use_register(creg,REG_EAX,1);
jmp(retlabel);
}
void
gen_gdecl(n,gpc)
char *n;
int gpc;
{
/*
if (stmode!=STATIC)
printf(".globl %s\n",n);
*/
}
void
align()
{
if (data_alignment & 1)
printf("\t.align 2\n");
data_alignment = 0;
}
void
emit_data(e,t,n)
int e,t;
NMTBL *n;
{
int l;
char *name;
name = n->nm;
if(mode==GDECL) { /* global */
n->dsp = -1; /* initiallized flag */
printf(".globl\t%s\n",name);
if(car(e)==CONST) {
data_mode(name);
if (t==CHAR) {
printf("%s:\n",name);
printf("\t.byte %d\n",cadr(e));
if (data_alignment>0)
data_alignment++;
} else {
align();
printf("%s:\n",name);
printf("\t.long %d\n",cadr(e));
}
} else if(t!=CHAR) {
if(car(e)==ADDRESS&&car(cadr(e))==GVAR) {
data_mode(name);
align();
printf("%s:\n",name);
printf("\t.long %s\n",caddr(cadr(e)));
} else if(car(e)==FNAME) {
data_mode(name);
align();
printf("%s:\n",name);
printf("\t.long %s\n",((NMTBL *)cadr(e))->nm);
} else if(car(e)==STRING) {
text_mode();
l = backdef();
ascii((char *)cadr(e));
data_mode(name);
align();
printf("%s:\n",name);
printf("\t.long _%d\n",l);
} else error(TYERR);
}
} else {
if(car(e)==CONST) {
lddim(cadr(e));
indexy(t==CHAR?"movsbl":"movl",name);
} else if(t!=CHAR) {
if(car(e)==ADDRESS&&car(cadr(e))==GVAR)
printf("\tlea %s,%s\n",caddr(e),crn);
else if(car(e)==FNAME)
printf("\tlea %s,%s\n",((NMTBL *)cadr(e))->nm,crn);
else if(car(e)==STRING) {
string(e);
} else error(TYERR);
printf("\tmovl %s,%s\n",crn,name);
}
}
}
void
global_table()
{
NMTBL *n;
for(n=ntable;n < &ntable[GSYMS];n++) {
if (n->sc == GVAR && n->dsp != -1) {
/* n->dsp = -1 means initialized global */
printf(".comm %s,%d\n",n->nm,size(n->ty));
}
}
}
void
local_table()
{
NMTBL *n;
/* static local variables */
for(n=ntable+GSYMS;n < &ntable[GSYMS+LSYMS];n++) {
if (n->sc == GVAR) {
printf(".lcomm %s,%d\n",n->nm,size(n->ty));
}
}
}
void
text_mode()
{
if (output_mode!=TEXT_EMIT_MODE) {
printf(".text\n");
printf("\t.align 2\n");
output_mode = TEXT_EMIT_MODE;
}
}
void
data_mode(name)
char *name;
{
if (output_mode!=DATA_EMIT_MODE) {
printf(".data\n");
output_mode = DATA_EMIT_MODE;
}
printf("\t.type\t%s,@object\n",name);
}
/* end */