ref: 7e737ab9f7d62562c927a6af15dfc8eb78ecaec8
dir: /src/cmd/cc/cc2/target/qbe/code.c/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <scc/cstd.h>
#include <scc/scc.h>
#include "arch.h"
#include "../../cc2.h"
#define ADDR_LEN (INTIDENTSIZ+64)
static void binary(void), unary(void), store(void), jmp(void), ret(void),
branch(void), call(void), ecall(void), param(void),
asalloc(void), form2local(void), ldir(void), vastart(void),
vaarg(void);
static struct opdata {
void (*fun)(void);
char *txt;
char letter;
} optbl [] = {
[ASLDSB] = {.fun = unary, .txt = "loadsb", .letter = 'w'},
[ASLDUB] = {.fun = unary, .txt = "loadub", .letter = 'w'},
[ASLDSH] = {.fun = unary, .txt = "loadsh", .letter = 'w'},
[ASLDUH] = {.fun = unary, .txt = "loaduh", .letter = 'w'},
[ASLDSW] = {.fun = unary, .txt = "loadsw", .letter = 'w'},
[ASLDUW] = {.fun = unary, .txt = "loaduw", .letter = 'w'},
[ASLDL] = {.fun = unary, .txt = "loadl", .letter = 'l'},
[ASLDS] = {.fun = unary, .txt = "loads", .letter = 's'},
[ASLDD] = {.fun = unary, .txt = "loadd", .letter = 'd'},
[ASCOPYB] = {.fun = unary, .txt = "copy", .letter = 'b'},
[ASCOPYH] = {.fun = unary, .txt = "copy", .letter = 'h'},
[ASCOPYW] = {.fun = unary, .txt = "copy", .letter = 'w'},
[ASCOPYL] = {.fun = unary, .txt = "copy", .letter = 'l'},
[ASCOPYS] = {.fun = unary, .txt = "copy", .letter = 's'},
[ASCOPYD] = {.fun = unary, .txt = "copy", .letter = 'd'},
[ASSTB] = {.fun = store, .txt = "store", .letter = 'b'},
[ASSTH] = {.fun = store, .txt = "store", .letter = 'h'},
[ASSTW] = {.fun = store, .txt = "store", .letter = 'w'},
[ASSTL] = {.fun = store, .txt = "store", .letter = 'l'},
[ASSTM] = {.fun = ldir},
[ASSTS] = {.fun = store, .txt = "store", .letter = 's'},
[ASSTD] = {.fun = store, .txt = "store", .letter = 'd'},
[ASADDW] = {.fun = binary, .txt = "add", .letter = 'w'},
[ASSUBW] = {.fun = binary, .txt = "sub", .letter = 'w'},
[ASMULW] = {.fun = binary, .txt = "mul", .letter = 'w'},
[ASMODW] = {.fun = binary, .txt = "rem", .letter = 'w'},
[ASUMODW] = {.fun = binary, .txt = "urem", .letter = 'w'},
[ASDIVW] = {.fun = binary, .txt = "div", .letter = 'w'},
[ASUDIVW] = {.fun = binary, .txt = "udiv", .letter = 'w'},
[ASSHLW] = {.fun = binary, .txt = "shl", .letter = 'w'},
[ASSHRW] = {.fun = binary, .txt = "sar", .letter = 'w'},
[ASUSHRW] = {.fun = binary, .txt = "shr", .letter = 'w'},
[ASLTW] = {.fun = binary, .txt = "csltw", .letter = 'w'},
[ASULTW] = {.fun = binary, .txt = "cultw", .letter = 'w'},
[ASGTW] = {.fun = binary, .txt = "csgtw", .letter = 'w'},
[ASUGTW] = {.fun = binary, .txt = "cugtw", .letter = 'w'},
[ASLEW] = {.fun = binary, .txt = "cslew", .letter = 'w'},
[ASULEW] = {.fun = binary, .txt = "culew", .letter = 'w'},
[ASGEW] = {.fun = binary, .txt = "csgew", .letter = 'w'},
[ASUGEW] = {.fun = binary, .txt = "cugew", .letter = 'w'},
[ASEQW] = {.fun = binary, .txt = "ceqw", .letter = 'w'},
[ASNEW] = {.fun = binary, .txt = "cnew", .letter = 'w'},
[ASBANDW] = {.fun = binary, .txt = "and", .letter = 'w'},
[ASBORW] = {.fun = binary, .txt = "or", .letter = 'w'},
[ASBXORW] = {.fun = binary, .txt = "xor", .letter = 'w'},
[ASADDL] = {.fun = binary, .txt = "add", .letter = 'l'},
[ASSUBL] = {.fun = binary, .txt = "sub", .letter = 'l'},
[ASMULL] = {.fun = binary, .txt = "mul", .letter = 'l'},
[ASMODL] = {.fun = binary, .txt = "rem", .letter = 'l'},
[ASUMODL] = {.fun = binary, .txt = "urem", .letter = 'l'},
[ASDIVL] = {.fun = binary, .txt = "div", .letter = 'l'},
[ASUDIVL] = {.fun = binary, .txt = "udiv", .letter = 'l'},
[ASSHLL] = {.fun = binary, .txt = "shl", .letter = 'l'},
[ASSHRL] = {.fun = binary, .txt = "sar", .letter = 'l'},
[ASUSHRL] = {.fun = binary, .txt = "shr", .letter = 'l'},
[ASLTL] = {.fun = binary, .txt = "csltl", .letter = 'w'},
[ASULTL] = {.fun = binary, .txt = "cultl", .letter = 'w'},
[ASGTL] = {.fun = binary, .txt = "csgtl", .letter = 'w'},
[ASUGTL] = {.fun = binary, .txt = "cugtl", .letter = 'w'},
[ASLEL] = {.fun = binary, .txt = "cslel", .letter = 'w'},
[ASULEL] = {.fun = binary, .txt = "culel", .letter = 'w'},
[ASGEL] = {.fun = binary, .txt = "csgel", .letter = 'w'},
[ASUGEL] = {.fun = binary, .txt = "cugel", .letter = 'w'},
[ASEQL] = {.fun = binary, .txt = "ceql", .letter = 'w'},
[ASNEL] = {.fun = binary, .txt = "cnel", .letter = 'w'},
[ASBANDL] = {.fun = binary, .txt = "and", .letter = 'l'},
[ASBORL] = {.fun = binary, .txt = "or", .letter = 'l'},
[ASBXORL] = {.fun = binary, .txt = "xor", .letter = 'l'},
[ASADDS] = {.fun = binary, .txt = "add", .letter = 's'},
[ASSUBS] = {.fun = binary, .txt = "sub", .letter = 's'},
[ASMULS] = {.fun = binary, .txt = "mul", .letter = 's'},
[ASDIVS] = {.fun = binary, .txt = "div", .letter = 's'},
[ASLTS] = {.fun = binary, .txt = "clts", .letter = 'w'},
[ASGTS] = {.fun = binary, .txt = "cgts", .letter = 'w'},
[ASLES] = {.fun = binary, .txt = "cles", .letter = 'w'},
[ASGES] = {.fun = binary, .txt = "cges", .letter = 'w'},
[ASEQS] = {.fun = binary, .txt = "ceqs", .letter = 'w'},
[ASNES] = {.fun = binary, .txt = "cnes", .letter = 'w'},
[ASADDD] = {.fun = binary, .txt = "add", .letter = 'd'},
[ASSUBD] = {.fun = binary, .txt = "sub", .letter = 'd'},
[ASMULD] = {.fun = binary, .txt = "mul", .letter = 'd'},
[ASDIVD] = {.fun = binary, .txt = "div", .letter = 'd'},
[ASLTD] = {.fun = binary, .txt = "cltd", .letter = 'w'},
[ASGTD] = {.fun = binary, .txt = "cgtd", .letter = 'w'},
[ASLED] = {.fun = binary, .txt = "cled", .letter = 'w'},
[ASGED] = {.fun = binary, .txt = "cged", .letter = 'w'},
[ASEQD] = {.fun = binary, .txt = "ceqd", .letter = 'w'},
[ASNED] = {.fun = binary, .txt = "cned", .letter = 'w'},
[ASEXTBW] = {.fun = unary, .txt = "extsb", .letter = 'w'},
[ASUEXTBW]= {.fun = unary, .txt = "extub", .letter = 'w'},
[ASEXTBL] = {.fun = unary, .txt = "extsb", .letter = 'l'},
[ASUEXTBL]= {.fun = unary, .txt = "extub", .letter = 'l'},
[ASEXTHW] = {.fun = unary, .txt = "extsh", .letter = 'w'},
[ASUEXTHW]= {.fun = unary, .txt = "extuh", .letter = 'w'},
[ASEXTWL] = {.fun = unary, .txt = "extsw", .letter = 'l'},
[ASUEXTWL]= {.fun = unary, .txt = "extuw", .letter = 'l'},
[ASSTOL] = {.fun = unary, .txt = "stosi", .letter = 'l'},
[ASSTOW] = {.fun = unary, .txt = "stosi", .letter = 'w'},
[ASDTOL] = {.fun = unary, .txt = "dtosi", .letter = 'l'},
[ASDTOW] = {.fun = unary, .txt = "dtosi", .letter = 'w'},
[ASSWTOD] = {.fun = unary, .txt = "swtof", .letter = 'd'},
[ASSWTOS] = {.fun = unary, .txt = "swtof", .letter = 's'},
[ASSLTOD] = {.fun = unary, .txt = "sltof", .letter = 'd'},
[ASSLTOS] = {.fun = unary, .txt = "sltof", .letter = 's'},
[ASEXTS] = {.fun = unary, .txt = "exts", .letter = 'd'},
[ASTRUNCD] = {.fun = unary, .txt = "truncd", .letter = 's'},
[ASBRANCH] = {.fun = branch},
[ASJMP] = {.fun = jmp},
[ASRET] = {.fun = ret},
[ASCALL] = {.fun = call},
[ASCALLE] = {.fun = ecall, .txt = ")"},
[ASCALLEX] = {.fun = ecall, .txt = ", ...)"},
[ASPAR] = {.fun = param, .txt = "%s %s, "},
[ASPARE] = {.fun = param, .txt = "%s %s"},
[ASALLOC] = {.fun = asalloc},
[ASFORM] = {.fun = form2local},
[ASVSTAR] = {.fun = vastart},
[ASVARG] = {.fun = vaarg},
};
static char buff[ADDR_LEN];
/*
* : is for user-defined Aggregate Types
* $ is for globals (represented by a pointer)
* % is for function-scope temporaries
* @ is for block labels
*/
static char
sigil(Symbol *sym)
{
switch (sym->kind) {
case SEXTRN:
case SGLOB:
case SPRIV:
case SLOCAL:
return '$';
case SAUTO:
case STMP:
return '%';
case SLABEL:
return '@';
default:
abort();
}
}
static char *
symname(Symbol *sym)
{
char c = sigil(sym);
if (sym->name) {
switch (sym->kind) {
case SEXTRN:
case SGLOB:
sprintf(buff, "%c%s", c, sym->name);
return buff;
case SLOCAL:
case SPRIV:
case SAUTO:
sprintf(buff, "%c%s.%u", c, sym->name, sym->id);
return buff;
default:
abort();
}
}
sprintf(buff, "%c.%u", c, sym->numid);
return buff;
}
static void
emitconst(Node *np)
{
switch (np->type.size) {
case 1:
printf("%d", (int) np->u.i & 0xFF);
break;
case 2:
printf("%d", (int) np->u.i & 0xFFFF);
break;
case 4:
printf("%ld", (long) np->u.i & 0xFFFFFFFF);
break;
case 8:
printf("%lld", (long long) np->u.i);
break;
default:
abort();
}
}
static void
emittree(Node *np)
{
if (!np)
return;
switch (np->op) {
case OSTRING:
printf("\"%s\"", np->u.s);
free(np->u.s);
np->u.s = NULL;
break;
case OCONST:
emitconst(np);
break;
case OADDR:
emittree(np->left);
break;
case OMEM:
fputs(symname(np->u.sym), stdout);
break;
default:
emittree(np->left);
printf(" %c ", np->op);
emittree(np->right);
break;
}
}
static char *
size2asm(Type *tp)
{
if (tp->flags & STRF) {
return "b";
} else if (tp->flags & INTF) {
switch (tp->size) {
case 1:
return "b";
case 2:
return "h";
case 4:
return "w";
case 8:
return "l";
}
} else if (tp->flags & FLOATF) {
if (tp->size == 4)
return "s";
else if (tp->size == 8)
return "d";
}
abort();
}
void
defglobal(Symbol *sym)
{
if (sym->kind == SEXTRN)
return;
if (sym->kind == SGLOB)
fputs("export ", stdout);
printf("data %s = {\n", symname(sym));
if (sym->type.flags & INITF)
return;
printf("\tz\t%lu\n}\n", sym->type.size);
}
void
defpar(Symbol *sym)
{
sym->type.flags |= PARF;
}
void
defvar(Symbol *sym)
{
if (sym->kind == SREG)
sym->kind = SAUTO;
}
void
data(Node *np)
{
printf("\t%s\t", size2asm(&np->type));
emittree(np);
putchar(',');
putchar('\n');
}
static char *
size2stack(Type *tp)
{
if (tp->flags & INTF) {
switch (tp->size) {
case 1:
case 2:
case 4:
return "w";
case 8:
return "l";
}
} else if (tp->flags & FLOATF) {
if (tp->size == 4)
return "s";
else if (tp->size == 8)
return "d";
} else if (tp->size == 0) {
return "w";
}
abort();
}
void
writeout(void)
{
Symbol *p;
Type *tp;
char *sep, *name;
int haslabel = 0;
if (!curfun)
return;
if (curfun->kind == SGLOB)
fputs("export ", stdout);
printf("function %s %s(", size2stack(&curfun->rtype), symname(curfun));
/* declare formal parameters */
for (sep = "", p = locals; p; p = p->next, sep = ",") {
if ((p->type.flags & PARF) == 0)
break;
printf("%s%s %s.val", sep, size2stack(&p->type), symname(p));
}
printf("%s)\n{\n", (curfun->type.flags&ELLIPS) ? ", ..." : "");
/* emit assembler instructions */
for (pc = prog; pc; pc = pc->next) {
if (pc->label) {
haslabel = 1;
printf("%s\n", symname(pc->label));
}
if (!pc->op)
continue;
if (pc->flags&BBENTRY && !haslabel)
printf("%s\n", symname(newlabel()));
(*optbl[pc->op].fun)();
if (!pc->label)
haslabel = 0;
}
puts("}");
}
static char *
addr2txt(Addr *a)
{
switch (a->kind) {
case SCONST:
sprintf(buff, "%llu", (unsigned long long) a->u.i);
return buff;
case SAUTO:
case SLABEL:
case STMP:
case SGLOB:
case SEXTRN:
case SPRIV:
case SLOCAL:
return symname(a->u.sym);
default:
abort();
}
}
static void
binary(void)
{
struct opdata *p = &optbl[pc->op];
char to[ADDR_LEN], from1[ADDR_LEN], from2[ADDR_LEN];
strcpy(to, addr2txt(&pc->to));
strcpy(from1, addr2txt(&pc->from1));
strcpy(from2, addr2txt(&pc->from2));
printf("\t%s =%c\t%s\t%s,%s\n", to, p->letter, p->txt, from1, from2);
}
static void
ldir(void)
{
struct opdata *p = &optbl[pc->op];
char to[ADDR_LEN], from[ADDR_LEN];
/* TODO: what type do we use for the size? */
/* TODO: it is pending */
}
static void
store(void)
{
struct opdata *p = &optbl[pc->op];
char to[ADDR_LEN], from[ADDR_LEN];
strcpy(to, addr2txt(&pc->to));
strcpy(from, addr2txt(&pc->from1));
printf("\t\t%s%c\t%s,%s\n", p->txt, p->letter, from, to);
}
static void
unary(void)
{
struct opdata *p = &optbl[pc->op];
char to[ADDR_LEN], from[ADDR_LEN];
strcpy(to, addr2txt(&pc->to));
strcpy(from, addr2txt(&pc->from1));
printf("\t%s =%c\t%s\t%s\n", to, p->letter, p->txt, from);
}
static void
call(void)
{
struct opdata *p = &optbl[pc->op];
char to[ADDR_LEN], from[ADDR_LEN];
Symbol *sym = pc->to.u.sym;
strcpy(to, addr2txt(&pc->to));
strcpy(from, addr2txt(&pc->from1));
printf("\t%s =%s\tcall\t%s(",
to, size2stack(&sym->type), from);
}
static void
param(void)
{
Symbol *sym = pc->from2.u.sym;
printf(optbl[pc->op].txt,
size2stack(&sym->type), addr2txt(&pc->from1));
}
static void
ecall(void)
{
struct opdata *p = &optbl[pc->op];
puts(p->txt);
}
static void
ret(void)
{
if (pc->from1.kind == SNONE)
puts("\t\tret");
else
printf("\t\tret\t%s\n", addr2txt(&pc->from1));
}
static void
jmp(void)
{
printf("\t\tjmp\t%s\n", addr2txt(&pc->from1));
}
static void
branch(void)
{
char to[ADDR_LEN], from1[ADDR_LEN], from2[ADDR_LEN];
strcpy(to, addr2txt(&pc->to));
strcpy(from1, addr2txt(&pc->from1));
strcpy(from2, addr2txt(&pc->from2));
printf("\t\tjnz\t%s,%s,%s\n", to, from1, from2);
}
static void
vastart(void)
{
printf("\t\tvastart %s\n", addr2txt(&pc->from1));
}
static void
vaarg(void)
{
Symbol *sym = pc->to.u.sym;
Type *tp = &sym->type;
char to[ADDR_LEN], from[ADDR_LEN];
strcpy(to, addr2txt(&pc->to));
strcpy(from, addr2txt(&pc->from1));
printf("\t\t%s =%s vaarg %s\n", to, size2asm(tp), from);
}
static void
asalloc(void)
{
Symbol *sym = pc->to.u.sym;
Type *tp = &sym->type;
extern Type ptrtype;
printf("\t%s =%s\talloc%lu\t%lu\n",
symname(sym), size2asm(&ptrtype), tp->align+3 & ~3, tp->size);
}
static void
form2local(void)
{
Symbol *sym = pc->to.u.sym;
Type *tp = &sym->type;
char *name = symname(sym);
printf("\t\tstore%s\t%s.val,%s\n", size2asm(tp), name, name);
}
void
endinit(void)
{
puts("}");
}
void
getbblocks(void)
{
Inst *i;
if (!prog)
return;
prog->flags |= BBENTRY;
for (pc = prog; pc; pc = pc->next) {
switch (pc->op) {
case ASBRANCH:
i = pc->from2.u.sym->u.inst;
i->flags |= BBENTRY;
case ASJMP:
i = pc->from1.u.sym->u.inst;
i->flags |= BBENTRY;
case ASRET:
if (pc->next)
pc->next->flags |= BBENTRY;
break;
}
}
}