www.pudn.com > nasm-src.rar > x86nasm.md
%{
enum { EAX=0, ECX=1, EDX=2, EBX=3, ESI=6, EDI=7 };
#include "c.h"
#define NODEPTR_TYPE Node
#define OP_LABEL(p) ((p)->op)
#define LEFT_CHILD(p) ((p)->kids[0])
#define RIGHT_CHILD(p) ((p)->kids[1])
#define STATE_LABEL(p) ((p)->x.state)
static void address ARGS((Symbol, Symbol, int));
static void blkfetch ARGS((int, int, int, int));
static void blkloop ARGS((int, int, int, int, int, int[]));
static void blkstore ARGS((int, int, int, int));
static void defaddress ARGS((Symbol));
static void defconst ARGS((int, Value));
static void defstring ARGS((int, char *));
static void defsymbol ARGS((Symbol));
static void doarg ARGS((Node));
static void emit2 ARGS((Node));
static void export ARGS((Symbol));
static void clobber ARGS((Node));
static void function ARGS((Symbol, Symbol [], Symbol [], int));
static void global ARGS((Symbol));
static void import ARGS((Symbol));
static void local ARGS((Symbol));
static void progbeg ARGS((int, char **));
static void progend ARGS((void));
static void segment ARGS((int));
static void space ARGS((int));
static void target ARGS((Node));
static int ckstack ARGS((Node, int));
static int memop ARGS((Node));
static int sametree ARGS((Node, Node));
static Symbol charreg[32], shortreg[32], intreg[32];
static Symbol fltreg[32];
static int cseg;
static Symbol quo, rem;
%}
%start stmt
%term ADDD=306 ADDF=305 ADDI=309 ADDP=311 ADDU=310
%term ADDRFP=279
%term ADDRGP=263
%term ADDRLP=295
%term ARGB=41 ARGD=34 ARGF=33 ARGI=37 ARGP=39
%term ASGNB=57 ASGNC=51 ASGND=50 ASGNF=49 ASGNI=53 ASGNP=55 ASGNS=52
%term BANDU=390
%term BCOMU=406
%term BORU=422
%term BXORU=438
%term CALLB=217 CALLD=210 CALLF=209 CALLI=213 CALLV=216
%term CNSTC=19 CNSTD=18 CNSTF=17 CNSTI=21 CNSTP=23 CNSTS=20 CNSTU=22
%term CVCI=85 CVCU=86
%term CVDF=97 CVDI=101
%term CVFD=114
%term CVIC=131 CVID=130 CVIS=132 CVIU=134
%term CVPU=150
%term CVSI=165 CVSU=166
%term CVUC=179 CVUI=181 CVUP=183 CVUS=180
%term DIVD=450 DIVF=449 DIVI=453 DIVU=454
%term EQD=482 EQF=481 EQI=485
%term GED=498 GEF=497 GEI=501 GEU=502
%term GTD=514 GTF=513 GTI=517 GTU=518
%term INDIRB=73 INDIRC=67 INDIRD=66 INDIRF=65 INDIRI=69 INDIRP=71 INDIRS=68
%term JUMPV=584
%term LABELV=600
%term LED=530 LEF=529 LEI=533 LEU=534
%term LOADB=233 LOADC=227 LOADD=226 LOADF=225 LOADI=229 LOADP=231 LOADS=228 LOADU=230
%term LSHI=341 LSHU=342
%term LTD=546 LTF=545 LTI=549 LTU=550
%term MODI=357 MODU=358
%term MULD=466 MULF=465 MULI=469 MULU=470
%term NED=562 NEF=561 NEI=565
%term NEGD=194 NEGF=193 NEGI=197
%term RETD=242 RETF=241 RETI=245
%term RSHI=373 RSHU=374
%term SUBD=322 SUBF=321 SUBI=325 SUBP=327 SUBU=326
%term VREGP=615
%%
reg: INDIRC(VREGP) "# read register\n"
reg: INDIRD(VREGP) "# read register\n"
reg: INDIRF(VREGP) "# read register\n"
reg: INDIRI(VREGP) "# read register\n"
reg: INDIRP(VREGP) "# read register\n"
reg: INDIRS(VREGP) "# read register\n"
stmt: ASGNC(VREGP,reg) "# write register\n"
stmt: ASGND(VREGP,reg) "# write register\n"
stmt: ASGNF(VREGP,reg) "# write register\n"
stmt: ASGNI(VREGP,reg) "# write register\n"
stmt: ASGNP(VREGP,reg) "# write register\n"
stmt: ASGNS(VREGP,reg) "# write register\n"
con: CNSTC "%a"
con: CNSTI "%a"
con: CNSTP "%a"
con: CNSTS "%a"
con: CNSTU "%a"
stmt: reg ""
reg: CVIU(reg) "%0" notarget(a)
reg: CVPU(reg) "%0" notarget(a)
reg: CVUI(reg) "%0" notarget(a)
reg: CVUP(reg) "%0" notarget(a)
acon: ADDRGP "%a"
acon: con "%0"
base: ADDRGP "%a"
base: reg "%0"
base: ADDI(reg,acon) "%0 + (%1)"
base: ADDP(reg,acon) "%0 + (%1)"
base: ADDU(reg,acon) "%0 + (%1)"
base: ADDRFP "ebp + %a"
base: ADDRLP "ebp + %a"
index: reg "%0"
index: LSHI(reg,con1) "%0*2"
index: LSHI(reg,con2) "%0*4"
index: LSHI(reg,con3) "%0*8"
con1: CNSTI "1" range(a, 1, 1)
con1: CNSTU "1" range(a, 1, 1)
con2: CNSTI "2" range(a, 2, 2)
con2: CNSTU "2" range(a, 2, 2)
con3: CNSTI "3" range(a, 3, 3)
con3: CNSTU "3" range(a, 3, 3)
index: LSHU(reg,con1) "%0*2"
index: LSHU(reg,con2) "%0*4"
index: LSHU(reg,con3) "%0*8"
addr: base "[%0]"
addr: ADDI(index,base) "[%1 + %0]"
addr: ADDP(index,base) "[%1 + %0]"
addr: ADDU(index,base) "[%1 + %0]"
addr: index "[%0]"
mem: INDIRC(addr) "byte %0"
mem: INDIRI(addr) "dword %0"
mem: INDIRP(addr) "dword %0"
mem: INDIRS(addr) "word %0"
rc: reg "%0"
rc: con "%0"
mr: reg "%0"
mr: mem "%0"
mrc0: mem "%0"
mrc0: rc "%0"
mrc1: mem "%0" 1
mrc1: rc "%0"
mrc3: mem "%0" 3
mrc3: rc "%0"
reg: addr "lea %c,%0\n" 1
reg: mrc0 "mov %c,%0\n" 1
reg: LOADC(reg) "mov %c,%0\n" move(a)
reg: LOADI(reg) "mov %c,%0\n" move(a)
reg: LOADP(reg) "mov %c,%0\n" move(a)
reg: LOADS(reg) "mov %c,%0\n" move(a)
reg: LOADU(reg) "mov %c,%0\n" move(a)
reg: ADDI(reg,mrc1) "?mov %c,%0\nadd %c,%1\n" 1
reg: ADDP(reg,mrc1) "?mov %c,%0\nadd %c,%1\n" 1
reg: ADDU(reg,mrc1) "?mov %c,%0\nadd %c,%1\n" 1
reg: SUBI(reg,mrc1) "?mov %c,%0\nsub %c,%1\n" 1
reg: SUBP(reg,mrc1) "?mov %c,%0\nsub %c,%1\n" 1
reg: SUBU(reg,mrc1) "?mov %c,%0\nsub %c,%1\n" 1
reg: BANDU(reg,mrc1) "?mov %c,%0\nand %c,%1\n" 1
reg: BORU(reg,mrc1) "?mov %c,%0\nor %c,%1\n" 1
reg: BXORU(reg,mrc1) "?mov %c,%0\nxor %c,%1\n" 1
stmt: ASGNI(addr,ADDI(mem,con1)) "inc %1\n" memop(a)
stmt: ASGNI(addr,ADDU(mem,con1)) "inc %1\n" memop(a)
stmt: ASGNP(addr,ADDP(mem,con1)) "inc %1\n" memop(a)
stmt: ASGNI(addr,SUBI(mem,con1)) "dec %1\n" memop(a)
stmt: ASGNI(addr,SUBU(mem,con1)) "dec %1\n" memop(a)
stmt: ASGNP(addr,SUBP(mem,con1)) "dec %1\n" memop(a)
stmt: ASGNI(addr,ADDI(mem,rc)) "add %1,%2\n" memop(a)
stmt: ASGNI(addr,ADDU(mem,rc)) "add %1,%2\n" memop(a)
stmt: ASGNI(addr,SUBI(mem,rc)) "sub %1,%2\n" memop(a)
stmt: ASGNI(addr,SUBU(mem,rc)) "sub %1,%2\n" memop(a)
stmt: ASGNI(addr,BANDU(mem,rc)) "and %1,%2\n" memop(a)
stmt: ASGNI(addr,BORU(mem,rc)) "or %1,%2\n" memop(a)
stmt: ASGNI(addr,BXORU(mem,rc)) "xor %1,%2\n" memop(a)
reg: BCOMU(reg) "?mov %c,%0\nnot %c\n" 2
reg: NEGI(reg) "?mov %c,%0\nneg %c\n" 2
stmt: ASGNI(addr,BCOMU(mem)) "not %1\n" memop(a)
stmt: ASGNI(addr,NEGI(mem)) "neg %1\n" memop(a)
reg: LSHI(reg,rc5) "?mov %c,%0\nsal %c,%1\n" 2
reg: LSHU(reg,rc5) "?mov %c,%0\nshl %c,%1\n" 2
reg: RSHI(reg,rc5) "?mov %c,%0\nsar %c,%1\n" 2
reg: RSHU(reg,rc5) "?mov %c,%0\nshr %c,%1\n" 2
stmt: ASGNI(addr,LSHI(mem,rc5)) "sal %1,%2\n" memop(a)
stmt: ASGNI(addr,LSHU(mem,rc5)) "shl %1,%2\n" memop(a)
stmt: ASGNI(addr,RSHI(mem,rc5)) "sar %1,%2\n" memop(a)
stmt: ASGNI(addr,RSHU(mem,rc5)) "shr %1,%2\n" memop(a)
rc5: CNSTI "%a" range(a, 0, 31)
rc5: reg "cl"
reg: MULI(reg,mrc3) "?mov %c,%0\nimul %c,%1\n" 14
reg: MULI(con,mr) "imul %c,%1,%0\n" 13
reg: MULU(reg,mr) "mul %1\n" 13
reg: DIVU(reg,reg) "xor edx,edx\ndiv %1\n"
reg: MODU(reg,reg) "xor edx,edx\ndiv %1\n"
reg: DIVI(reg,reg) "cdq\nidiv %1\n"
reg: MODI(reg,reg) "cdq\nidiv %1\n"
reg: CVIU(reg) "mov %c,%0\n" move(a)
reg: CVPU(reg) "mov %c,%0\n" move(a)
reg: CVUI(reg) "mov %c,%0\n" move(a)
reg: CVUP(reg) "mov %c,%0\n" move(a)
reg: CVCI(INDIRC(addr)) "movsx %c,byte %0\n" 3
reg: CVCU(INDIRC(addr)) "movzx %c,byte %0\n" 3
reg: CVSI(INDIRS(addr)) "movsx %c,word %0\n" 3
reg: CVSU(INDIRS(addr)) "movzx %c,word %0\n" 3
reg: CVCI(reg) "# extend\n" 3
reg: CVCU(reg) "# extend\n" 3
reg: CVSI(reg) "# extend\n" 3
reg: CVSU(reg) "# extend\n" 3
reg: CVIC(reg) "# truncate\n" 1
reg: CVIS(reg) "# truncate\n" 1
reg: CVUC(reg) "# truncate\n" 1
reg: CVUS(reg) "# truncate\n" 1
stmt: ASGNC(addr,rc) "mov byte %0,%1\n" 1
stmt: ASGNI(addr,rc) "mov dword %0,%1\n" 1
stmt: ASGNP(addr,rc) "mov dword %0,%1\n" 1
stmt: ASGNS(addr,rc) "mov word %0,%1\n" 1
stmt: ARGI(mrc3) "push dword %0\n" 1
stmt: ARGP(mrc3) "push dword %0\n" 1
stmt: ASGNB(reg,INDIRB(reg)) "mov ecx,%a\nrep movsb\n"
stmt: ARGB(INDIRB(reg)) "sub esp,%a\nmov edi,esp\nmov ecx,%a\nrep movsb\n"
memf: INDIRD(addr) "qword %0"
memf: INDIRF(addr) "dword %0"
memf: CVFD(INDIRF(addr)) "dword %0"
reg: memf "fld %0\n" 3
stmt: ASGND(addr,reg) "fstp qword %0\n" 7
stmt: ASGNF(addr,reg) "fstp dword %0\n" 7
stmt: ASGNF(addr,CVDF(reg)) "fstp dword %0\n" 7
stmt: ARGD(reg) "sub esp,8\nfstp qword [esp]\n"
stmt: ARGF(reg) "sub esp,4\nfstp dword [esp]\n"
reg: NEGD(reg) "fchs\n"
reg: NEGF(reg) "fchs\n"
reg: ADDD(reg,memf) "fadd %1\n"
reg: ADDD(reg,reg) "faddp st1\n"
reg: ADDF(reg,memf) "fadd %1\n"
reg: ADDF(reg,reg) "faddp st1\n"
reg: DIVD(reg,memf) "fdiv %1\n"
reg: DIVD(reg,reg) "fdivp st1\n"
reg: DIVF(reg,memf) "fdiv %1\n"
reg: DIVF(reg,reg) "fdivp st1\n"
reg: MULD(reg,memf) "fmul %1\n"
reg: MULD(reg,reg) "fmulp st1\n"
reg: MULF(reg,memf) "fmul %1\n"
reg: MULF(reg,reg) "fmulp st1\n"
reg: SUBD(reg,memf) "fsub %1\n"
reg: SUBD(reg,reg) "fsubp st1\n"
reg: SUBF(reg,memf) "fsub %1\n"
reg: SUBF(reg,reg) "fsubp st1\n"
reg: CVFD(reg) "# CVFD\n"
reg: CVDF(reg) "sub esp,4\nfstp dword [esp]\nfld dword [esp]\nadd esp,4\n" 12
stmt: ASGNI(addr,CVDI(reg)) "fistp dword %0\n" 29
reg: CVDI(reg) "sub esp,4\nfistp dword [esp]\npop %c\n" 31
reg: CVID(INDIRI(addr)) "fild dword %0\n" 10
reg: CVID(reg) "push %0\nfild dword [esp]\nadd esp,4\n" 12
addrj: ADDRGP "%a"
addrj: reg "%0" 2
addrj: mem "%0" 2
stmt: JUMPV(addrj) "jmp %0\n" 3
stmt: LABELV "%a:\n"
stmt: EQI(mem,rc) "cmp %0,%1\nje near %a\n" 5
stmt: GEI(mem,rc) "cmp %0,%1\njge near %a\n" 5
stmt: GTI(mem,rc) "cmp %0,%1\njg near %a\n" 5
stmt: LEI(mem,rc) "cmp %0,%1\njle near %a\n" 5
stmt: LTI(mem,rc) "cmp %0,%1\njl near %a\n" 5
stmt: NEI(mem,rc) "cmp %0,%1\njne near %a\n" 5
stmt: GEU(mem,rc) "cmp %0,%1\njae near %a\n" 5
stmt: GTU(mem,rc) "cmp %0,%1\nja near %a\n" 5
stmt: LEU(mem,rc) "cmp %0,%1\njbe near %a\n" 5
stmt: LTU(mem,rc) "cmp %0,%1\njb near %a\n" 5
stmt: EQI(reg,mrc1) "cmp %0,%1\nje near %a\n" 4
stmt: GEI(reg,mrc1) "cmp %0,%1\njge near %a\n" 4
stmt: GTI(reg,mrc1) "cmp %0,%1\njg near %a\n" 4
stmt: LEI(reg,mrc1) "cmp %0,%1\njle near %a\n" 4
stmt: LTI(reg,mrc1) "cmp %0,%1\njl near %a\n" 4
stmt: NEI(reg,mrc1) "cmp %0,%1\njne near %a\n" 4
stmt: GEU(reg,mrc1) "cmp %0,%1\njae near %a\n" 4
stmt: GTU(reg,mrc1) "cmp %0,%1\nja near %a\n" 4
stmt: LEU(reg,mrc1) "cmp %0,%1\njbe near %a\n" 4
stmt: LTU(reg,mrc1) "cmp %0,%1\njb near %a\n" 4
cmpf: memf " %0"
cmpf: reg "p"
stmt: EQD(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\nje near %a\n"
stmt: GED(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\njbe near %a\n"
stmt: GTD(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\njb near %a\n"
stmt: LED(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\njae near %a\n"
stmt: LTD(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\nja near %a\n"
stmt: NED(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\njne near %a\n"
stmt: EQF(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\nje near %a\n"
stmt: GEF(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\njbe near %a\n"
stmt: GTF(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\njb near %a\n"
stmt: LEF(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\njae near %a\n"
stmt: LTF(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\nja near %a\n"
stmt: NEF(cmpf,reg) "fcomp%0\nfstsw ax\nsahf\njne near %a\n"
reg: CALLI(addrj) "call %0\nadd esp,%a\n"
stmt: CALLV(addrj) "call %0\nadd esp,%a\n"
reg: CALLF(addrj) "call %0\nadd esp,%a\n"
reg: CALLD(addrj) "call %0\nadd esp,%a\n"
stmt: RETI(reg) "# ret\n"
stmt: RETF(reg) "# ret\n"
stmt: RETD(reg) "# ret\n"
%%
static void progbeg(argc, argv) int argc; char *argv[]; {
int i;
{
union {
char c;
int i;
} u;
u.i = 0;
u.c = 1;
swap = (u.i == 1) != IR->little_endian;
}
parseflags(argc, argv);
intreg[EAX] = mkreg("eax", EAX, 1, IREG);
intreg[EDX] = mkreg("edx", EDX, 1, IREG);
intreg[ECX] = mkreg("ecx", ECX, 1, IREG);
intreg[EBX] = mkreg("ebx", EBX, 1, IREG);
intreg[ESI] = mkreg("esi", ESI, 1, IREG);
intreg[EDI] = mkreg("edi", EDI, 1, IREG);
shortreg[EAX] = mkreg("ax", EAX, 1, IREG);
shortreg[ECX] = mkreg("cx", ECX, 1, IREG);
shortreg[EDX] = mkreg("dx", EDX, 1, IREG);
shortreg[EBX] = mkreg("bx", EBX, 1, IREG);
shortreg[ESI] = mkreg("si", ESI, 1, IREG);
shortreg[EDI] = mkreg("di", EDI, 1, IREG);
charreg[EAX] = mkreg("al", EAX, 1, IREG);
charreg[ECX] = mkreg("cl", ECX, 1, IREG);
charreg[EDX] = mkreg("dl", EDX, 1, IREG);
charreg[EBX] = mkreg("bl", EBX, 1, IREG);
for (i = 0; i < 8; i++)
fltreg[i] = mkreg("%d", i, 0, FREG);
rmap[C] = mkwildcard(charreg);
rmap[S] = mkwildcard(shortreg);
rmap[P] = rmap[B] = rmap[U] = rmap[I] = mkwildcard(intreg);
rmap[F] = rmap[D] = mkwildcard(fltreg);
tmask[IREG] = (1<x.regnode->mask |= 1<x.regnode->mask |= 1<op) {
case RSHI: case RSHU: case LSHI: case LSHU:
if (generic(p->kids[1]->op) != CNST
&& !( generic(p->kids[1]->op) == INDIR
&& p->kids[1]->kids[0]->op == VREG+P
&& p->kids[1]->syms[RX]->u.t.cse
&& generic(p->kids[1]->syms[RX]->u.t.cse->op) == CNST
)) {
rtarget(p, 1, intreg[ECX]);
setreg(p, intreg[EAX]);
}
break;
case MULU:
setreg(p, quo);
rtarget(p, 0, intreg[EAX]);
break;
case DIVI: case DIVU:
setreg(p, quo);
rtarget(p, 0, intreg[EAX]);
rtarget(p, 1, intreg[ECX]);
break;
case MODI: case MODU:
setreg(p, rem);
rtarget(p, 0, intreg[EAX]);
rtarget(p, 1, intreg[ECX]);
break;
case ASGNB:
rtarget(p, 0, intreg[EDI]);
rtarget(p->kids[1], 0, intreg[ESI]);
break;
case ARGB:
rtarget(p->kids[0], 0, intreg[ESI]);
break;
case CALLI: case CALLV:
setreg(p, intreg[EAX]);
break;
case RETI:
rtarget(p, 0, intreg[EAX]);
break;
}
}
static void clobber(p) Node p; {
static int nstack = 0;
assert(p);
nstack = ckstack(p, nstack);
assert(p->count > 0 || nstack == 0);
switch (p->op) {
case ASGNB: case ARGB:
spill(1<op)==F || optype((p)->op)==D)
static int ckstack(p, n) Node p; int n; {
int i;
for (i = 0; i < NELEMS(p->x.kids) && p->x.kids[i]; i++)
if (isfp(p->x.kids[i]))
n--;
if (isfp(p) && p->count > 0)
n++;
if (n > 8)
error("expression too complicated\n");
debug(fprint(2, "(ckstack(%x)=%d)\n", p, n));
assert(n >= 0);
return n;
}
static int memop(p) Node p; {
assert(p);
assert(generic(p->op) == ASGN);
assert(p->kids[0]);
assert(p->kids[1]);
if (generic(p->kids[1]->kids[0]->op) == INDIR
&& sametree(p->kids[0], p->kids[1]->kids[0]->kids[0]))
return 3;
else
return LBURG_MAX;
}
static int sametree(p, q) Node p, q; {
return p == NULL && q == NULL
|| p && q && p->op == q->op && p->syms[0] == q->syms[0]
&& sametree(p->kids[0], q->kids[0])
&& sametree(p->kids[1], q->kids[1]);
}
static void emit2(p) Node p; {
#define preg(f) ((f)[getregnum(p->x.kids[0])]->x.name)
if (p->op == CVCI)
print("movsx %s,%s\n", p->syms[RX]->x.name
, preg(charreg));
else if (p->op == CVCU)
print("movzx %s,%s\n", p->syms[RX]->x.name
, preg(charreg));
else if (p->op == CVSI)
print("movsx %s,%s\n", p->syms[RX]->x.name
, preg(shortreg));
else if (p->op == CVSU)
print("movzx %s,%s\n", p->syms[RX]->x.name
, preg(shortreg));
else if (p->op == CVIC || p->op == CVIS
|| p->op == CVUC || p->op == CVUS) {
char *dst = shortreg[getregnum(p)]->x.name;
char *src = preg(shortreg);
if (dst != src)
print("mov %s,%s\n", dst, src);
}
}
static void doarg(p) Node p; {
assert(p && p->syms[0]);
mkactual(4, p->syms[0]->u.c.v.i);
}
static void blkfetch(k, off, reg, tmp)
int k, off, reg, tmp; {}
static void blkstore(k, off, reg, tmp)
int k, off, reg, tmp; {}
static void blkloop(dreg, doff, sreg, soff, size, tmps)
int dreg, doff, sreg, soff, size, tmps[]; {}
static void local(p) Symbol p; {
if (isfloat(p->type))
p->sclass = AUTO;
if (askregvar(p, rmap[ttob(p->type)]) == 0)
mkauto(p);
}
static void function(f, caller, callee, n)
Symbol f, callee[], caller[]; int n; {
int i;
print("%s:\n", f->x.name);
print("push ebx\n");
print("push esi\n");
print("push edi\n");
print("push ebp\n");
print("mov ebp,esp\n");
usedmask[0] = usedmask[1] = 0;
freemask[0] = freemask[1] = ~(unsigned)0;
offset = 16 + 4;
for (i = 0; callee[i]; i++) {
Symbol p = callee[i];
Symbol q = caller[i];
assert(q);
p->x.offset = q->x.offset = offset;
p->x.name = q->x.name = stringf("%d", p->x.offset);
p->sclass = q->sclass = AUTO;
offset += roundup(q->type->size, 4);
}
assert(caller[i] == 0);
offset = maxoffset = 0;
gencode(caller, callee);
framesize = roundup(maxoffset, 4);
if (framesize > 0)
print("sub esp,%d\n", framesize);
emitcode();
print("mov esp,ebp\n");
print("pop ebp\n");
print("pop edi\n");
print("pop esi\n");
print("pop ebx\n");
print("ret\n");
}
static void defsymbol(p) Symbol p; {
if (p->scope >= LOCAL && p->sclass == STATIC)
p->x.name = stringf("L%d", genlabel(1));
else if (p->generated)
p->x.name = stringf("$L%s", p->name);
else if (p->scope == GLOBAL || p->sclass == EXTERN)
/* CHANGE THIS FOR a.out */
#if 0
p->x.name = stringf("$_%s", p->name);
#else
p->x.name = stringf("$%s", p->name);
#endif
else if (p->scope == CONSTANTS
&& (isint(p->type) || isptr(p->type))
&& p->name[0] == '0' && p->name[1] == 'x')
p->x.name = stringf("0%sH", &p->name[2]);
else
p->x.name = p->name;
}
static void address(q, p, n) Symbol q, p; int n; {
if (p->scope == GLOBAL
|| p->sclass == STATIC || p->sclass == EXTERN)
q->x.name = stringf("%s%s%d",
p->x.name, n >= 0 ? "+" : "", n);
else {
q->x.offset = p->x.offset + n;
q->x.name = stringd(q->x.offset);
}
}
static void defconst(ty, v) int ty; Value v; {
switch (ty) {
case C: print("db %d\n", v.uc); return;
case S: print("dw %d\n", v.ss); return;
case I: print("dd %d\n", v.i ); return;
case U: print("dd 0%xH\n", v.u ); return;
case P: print("dd 0%xH\n", v.p ); return;
case F:
print("dd 0%xH\n", *(unsigned *)&v.f);
return;
case D: {
unsigned *p = (unsigned *)&v.d;
print("dd 0%xH,0%xH\n", p[swap], p[1 - swap]);
return;
}
}
assert(0);
}
static void defaddress(p) Symbol p; {
print("dd %s\n", p->x.name);
}
static void defstring(n, str) int n; char *str; {
char *s;
int inquote = 1;
print("db '");
for (s = str; s < str + n; s++)
{
if ((*s & 0x7F) == *s && *s >= ' ' && *s != '\'') {
if (!inquote){
print(", '");
inquote = 1;
}
print("%c",*s);
}
else
{
if (inquote){
print("', ");
inquote = 0;
}
else
print(", ");
print("%d",*s);
}
}
if (inquote) print("'");
print("\n");
}
static void export(p) Symbol p; {
print("[global %s]\n", p->x.name);
}
static void import(p) Symbol p; {
if (p->ref > 0) {
print("[extern %s]\n", p->x.name);
}
}
static void global(p) Symbol p; {
int i;
if (p->u.seg == BSS)
print("resb ($-$$) & %d\n",
p->type->align > 4 ? 3 : p->type->align-1);
else
print("times ($-$$) & %d nop\n",
p->type->align > 4 ? 3 : p->type->align-1);
print("%s:\n", p->x.name);
if (p->u.seg == BSS)
print("resb %d\n", p->type->size);
}
static void space(n) int n; {
int i;
if (cseg != BSS)
print("times %d db 0\n", n);
}
Interface x86nasmIR = {
1, 1, 0, /* char */
2, 2, 0, /* short */
4, 4, 0, /* int */
4, 4, 1, /* float */
8, 4, 1, /* double */
4, 4, 0, /* T * */
0, 4, 0, /* struct; so that ARGB keeps stack aligned */
1, /* little_endian */
0, /* mulops_calls */
0, /* wants_callb */
1, /* wants_argb */
0, /* left_to_right */
0, /* wants_dag */
address,
blockbeg,
blockend,
defaddress,
defconst,
defstring,
defsymbol,
emit,
export,
function,
gen,
global,
import,
local,
progbeg,
progend,
segment,
space,
0, 0, 0, 0, 0, 0, 0,
{1, blkfetch, blkstore, blkloop,
_label,
_rule,
_nts,
_kids,
_opname,
_arity,
_string,
_templates,
_isinstruction,
_ntname,
emit2,
doarg,
target,
clobber,
}
};