ref: 4f8c064dd03b39ff214733ab69fb49662e75a8dd
dir: /cc1/code.c/
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "../inc/cc.h"
#include "cc1.h"
static void emitbin(unsigned, void *), emitswitcht(unsigned, void *),
emitcast(unsigned, void *), emitswitch(unsigned, void *),
emitsym(unsigned, void *),
emitexp(unsigned, void *),
emitsymid(unsigned, void *), emittext(unsigned, void *),
emitfun(unsigned, void *),
emitret(unsigned, void *), emitdcl(unsigned, void *);
char *optxt[] = {
[OADD] = "+",
[OSUB] = "-",
[OMUL] = "*",
[OINC] = ";+",
[ODEC] = ";-",
[OPTR] = "@",
[OMOD] = "%",
[ODIV] = "/",
[OSHL] = "l",
[OSHR] = "r",
[OLT] = "<",
[OGT] = ">",
[OGE] = "]",
[OLE] = "[",
[OEQ] = "=",
[ONE] = "!",
[OBAND] = "&",
[OBXOR] = "^",
[OBOR] = "|",
[OASSIGN] = ":",
[OA_MUL] = ":*",
[OA_DIV] = ":/",
[OA_MOD] = ":%",
[OA_ADD] = ":+",
[OA_SUB] = ":-",
[OA_SHL] = ":l",
[OA_SHR] = ":r",
[OA_AND] = ":&",
[OA_XOR] = ":^",
[OA_OR] = ":|",
[OADDR] = "a",
[ONEG] = "_",
[OCPL] = "~",
[OAND] = "y",
[OOR] = "o",
[OASK] = "?",
[OCOMMA] = ",",
[OLABEL] = "L%d\n",
[ODEFAULT] = "\tf\tL%d\n",
[OCASE] = "\tv\tL%d",
[OJUMP] = "\tj\tL%d\n",
[OBRANCH] = "\tj\tL%d",
[OEFUN] = "}",
[OELOOP] = "\tb",
[OBLOOP] = "\td",
[OPAR] = "p",
[OCALL] = "c",
[OFIELD] = "."
};
void (*opcode[])(unsigned, void *) = {
[OADD] = emitbin,
[OSUB] = emitbin,
[OMUL] = emitbin,
[OINC] = emitbin,
[ODEC] = emitbin,
[OPTR] = emitbin,
[OMOD] = emitbin,
[ODIV] = emitbin,
[OSHL] = emitbin,
[OSHR] = emitbin,
[OLT] = emitbin,
[OGT] = emitbin,
[OGE] = emitbin,
[OLE] = emitbin,
[OEQ] = emitbin,
[ONE] = emitbin,
[OBAND] = emitbin,
[OBXOR] = emitbin,
[OBOR] = emitbin,
[OASSIGN] = emitbin,
[OA_MUL] = emitbin,
[OA_DIV] = emitbin,
[OA_MOD] = emitbin,
[OA_ADD] = emitbin,
[OA_SUB] = emitbin,
[OA_SHL] = emitbin,
[OA_SHR] = emitbin,
[OA_AND] = emitbin,
[OA_XOR] = emitbin,
[OA_OR] = emitbin,
[OADDR] = emitbin,
[ONEG] = emitbin,
[OCPL] = emitbin,
[OAND] = emitbin,
[OOR] = emitbin,
[OCOMMA] = emitbin,
[OCAST] = emitcast,
[OSYM] = emitsym,
[OASK] = emitbin,
[OCOLON] = emitbin,
[OFIELD]= emitbin,
[OEXPR] = emitexp,
[OLABEL] = emitsymid,
[ODEFAULT] = emitsymid,
[OCASE] = emitsymid,
[OJUMP] = emitsymid,
[OBRANCH] = emitsymid,
[OEFUN] = emittext,
[OELOOP] = emittext,
[OBLOOP] = emittext,
[OFUN] = emitfun,
[ORET] = emitret,
[ODECL] = emitdcl,
[OSWITCH] = emitswitch,
[OSWITCHT] = emitswitcht,
[OPAR] = emitbin,
[OCALL] = emitbin
};
void
freetree(Node *np)
{
if (!np)
return;
freetree(np->left);
freetree(np->right);
free(np);
}
static void
emitnode(Node *np)
{
if (np)
(*opcode[np->op])(np->op, np);
}
void
emit(unsigned op, void *arg)
{
extern int failure;
if (failure)
return;
(*opcode[op])(op, arg);
}
static void
emitvar(Symbol *sym)
{
char c;
short flags = sym->flags;
if (flags & ISLOCAL)
c = L_LOCAL;
else if (flags & ISPRIVATE)
c = L_PRIVATE;
else if (flags & ISGLOBAL)
c = L_PUBLIC;
else if (flags & ISREGISTER)
c = L_REGISTER;
else if (flags & ISFIELD)
c = L_FIELD;
else if (flags & ISEXTERN)
c = L_EXTERN;
else
c = L_AUTO;
printf("%c%d", c, sym->id);
}
static void
emitconst(Node *np)
{
char *bp, c;
Symbol *sym = np->sym;
switch (BTYPE(np)) {
case INT:
printf("#%c%X", np->type->letter, sym->u.i);
break;
case ARY:
/*
* FIX: At this point we are going to assume
* that all the arrays are strings
*/
putchar('"');
for (bp = sym->u.s; c = *bp; ++bp)
printf("%02X", c & 0xFF);
break;
default:
/* TODO: Handle other kind of constants */
abort();
}
}
static void
emitsym(unsigned op, void *arg)
{
Node *np = arg;
putchar('\t');
(np->constant) ? emitconst(np) : emitvar(np->sym);
}
static void
emitletter(Type *tp)
{
putchar(tp->letter);
switch (tp->op) {
case ARY:
case FTN:
case STRUCT:
case UNION:
printf("%d", tp->id);
}
}
static void
emittype(Type *tp)
{
int n;
Type **vp;
Symbol **sp;
char *tag;
if (tp->printed || !tp->defined)
return;
tp->printed = 1;
switch (tp->op) {
case ARY:
emittype(tp->type);
emitletter(tp);
putchar('\t');
emitletter(tp->type);
printf("\t#%d\n", tp->n.elem);
return;
case PTR:
emittype(tp->type);
return;
case UNION:
case STRUCT:
n = tp->n.elem;
for (sp = tp->p.fields; n-- > 0; ++sp)
emittype((*sp)->type);
emitletter(tp);
if ((tag = tp->tag->name) != NULL)
printf("\t%s", tag);
puts("\t(");
n = tp->n.elem;
for (sp = tp->p.fields; n-- > 0; ++sp)
emit(ODECL, *sp);
puts(")");
break;
case FTN:
emitletter(tp);
n = tp->n.elem;
for (vp = tp->p.pars; n-- > 0; ++vp) {
putchar('\t');
emitletter(*vp);
}
putchar('\n');
return;
default:
abort();
}
}
static void
emitdcl(unsigned op, void *arg)
{
Symbol *sym = arg;
if (sym->flags & ISEMITTED)
return;
emittype(sym->type);
emitvar(sym);
putchar('\t');
emitletter(sym->type);
if (sym->name)
printf("\t%s", sym->name);
if (op != OFUN)
putchar('\n');
sym->flags |= ISEMITTED;
}
static void
emitcast(unsigned op, void *arg)
{
Node *np = arg, *lp = np->left;
emitnode(lp);
printf("\t%c%c", lp->type->letter, np->type->letter);
}
static void
emitbin(unsigned op, void *arg)
{
Node *np = arg;
char *s;
emitnode(np->left);
emitnode(np->right);
if ((s = optxt[op]) != NULL) { /* do not print in OCOLON case */
printf("\t%s", optxt[op]);
emitletter(np->type);
}
}
static void
emitexp(unsigned op, void *arg)
{
Node *np = arg;
emitnode(np);
putchar('\n');
freetree(np);
}
static void
emitfun(unsigned op, void *arg)
{
Symbol *sym = arg, **sp;
int n;
emitdcl(op, arg);
puts("\n{");
n = sym->type->n.elem;
for (sp = sym->u.pars; n-- > 0; ++sp) {
/* enable non used warnings in parameters */
(*sp)->flags &= ~ISUSED;
emit(ODECL, *sp);
}
puts("-");
}
static void
emitret(unsigned op, void *arg)
{
Type *tp = arg;
fputs("\ty", stdout);
emitletter(tp);
}
static void
emittext(unsigned op, void *arg)
{
puts(optxt[op]);
}
static void
emitsymid(unsigned op, void *arg)
{
Symbol *sym = arg;
printf(optxt[op], sym->id);
}
static void
emitswitch(unsigned op, void *arg)
{
Caselist *lcase = arg;
printf("\ts\tL%u", lcase->ltable->id);
emitexp(OEXPR, lcase->expr);
}
static void
emitswitcht(unsigned op, void *arg)
{
Caselist *lcase = arg;
struct scase *p, *next;
printf("\tt\t#%0x\n", lcase->nr);
for (p = lcase->head; p; p = next) {
emitsymid(OCASE, p->label);
emitexp(OEXPR, p->expr);
next = p->next;
free(p);
}
if (lcase->deflabel)
emitsymid(ODEFAULT, lcase->deflabel);
}
Node *
node(unsigned op, Type *tp, Node *lp, Node *rp)
{
Node *np;
np = xmalloc(sizeof(*np));
np->op = op;
np->type = tp;
np->sym = NULL;
np->constant = np->symbol = np->lvalue = 0;
np->left = lp;
np->right = rp;
return np;
}
Node *
varnode(Symbol *sym)
{
Node *np;
np = node(OSYM, sym->type, NULL, NULL);
np->lvalue = 1;
np->constant = 0;
np->symbol = 1;
np->sym = sym;
return np;
}
Node *
constnode(Symbol *sym)
{
Node *np;
np = node(OSYM, sym->type, NULL, NULL);
np->symbol = 1;
np->constant = 1;
np->sym = sym;
return np;
}
Node *
sizeofnode(Type *tp)
{
Symbol *sym;
sym = newsym(NS_IDEN);
sym->type = sizettype;
sym->u.i = tp->size;
return constnode(sym);
}