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qbe.c
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qbe.c
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#include <assert.h>
#include <ctype.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
#include "cc.h"
struct value {
enum {
VALUE_NONE,
VALUE_GLOBAL,
VALUE_INTCONST,
VALUE_FLTCONST,
VALUE_DBLCONST,
VALUE_TEMP,
VALUE_TYPE,
VALUE_LABEL,
VALUE_THREAD = 1<<4,
} kind;
unsigned id;
union {
char *name;
unsigned long long i;
double f;
} u;
};
struct lvalue {
struct value *addr;
struct bitfield bits;
};
enum instkind {
INONE,
#define OP(op, name) op,
#include "ops.h"
#undef OP
IARG,
IVARARG,
};
struct qbetype {
char base, data;
enum instkind load, store;
};
struct inst {
enum instkind kind;
int class;
struct value res, *arg[2];
};
struct jump {
enum {
JUMP_NONE,
JUMP_JMP,
JUMP_JNZ,
JUMP_RET,
JUMP_HLT,
} kind;
struct value *arg;
struct block *blk[2];
};
struct block {
struct value label;
struct array insts;
struct {
int class;
struct block *blk[2];
struct value *val[2];
struct value res;
} phi;
struct jump jump;
struct block *next;
};
struct switchcase {
struct treenode node;
struct block *body;
};
struct func {
struct decl *decl, *namedecl;
char *name;
struct value *paramtemps;
struct type *type;
struct block *start, *end;
struct map gotos;
unsigned lastid;
};
static const int ptrclass = 'l';
void
switchcase(struct switchcases *cases, unsigned long long i, struct block *b)
{
struct switchcase *c;
c = treeinsert(&cases->root, i, sizeof(*c));
if (!c->node.new)
error(&tok.loc, "multiple 'case' labels with same value");
c->body = b;
}
/* values */
struct block *
mkblock(char *name)
{
static unsigned id;
struct block *b;
b = xmalloc(sizeof(*b));
b->label.kind = VALUE_LABEL;
b->label.u.name = name;
b->label.id = ++id;
b->insts = (struct array){0};
b->jump.kind = JUMP_NONE;
b->phi.res.kind = VALUE_NONE;
b->next = NULL;
return b;
}
struct value *
mkglobal(struct decl *d)
{
static unsigned id;
struct value *v;
v = xmalloc(sizeof(*v));
v->kind = VALUE_GLOBAL;
if (d->kind == DECLOBJECT && d->u.obj.storage == SDTHREAD)
v->kind |= VALUE_THREAD;
if (d->asmname) {
v->u.name = d->asmname;
v->id = 0;
} else {
v->u.name = d->name;
v->id = d->linkage == LINKNONE ? ++id : 0;
}
return v;
}
struct value *
mkintconst(unsigned long long n)
{
struct value *v;
v = xmalloc(sizeof(*v));
v->kind = VALUE_INTCONST;
v->u.i = n;
return v;
}
static struct value *
mkfltconst(int kind, double n)
{
struct value *v;
v = xmalloc(sizeof(*v));
v->kind = kind;
v->u.f = n;
return v;
}
static struct qbetype
qbetype(struct type *t)
{
static const struct qbetype
ub = {'w', 'b', ILOADUB, ISTOREB},
sb = {'w', 'b', ILOADSB, ISTOREB},
uh = {'w', 'h', ILOADUH, ISTOREH},
sh = {'w', 'h', ILOADSH, ISTOREH},
w = {'w', 'w', ILOADW, ISTOREW},
l = {'l', 'l', ILOADL, ISTOREL},
s = {'s', 's', ILOADS, ISTORES},
d = {'d', 'd', ILOADD, ISTORED},
v = {0};
if (t == &typevoid)
return v;
if (!(t->prop & PROPSCALAR))
return l;
switch (t->size) {
case 1: return t->u.basic.issigned ? sb : ub;
case 2: return t->u.basic.issigned ? sh : uh;
case 4: return t->prop & PROPFLOAT ? s : w;
case 8: return t->prop & PROPFLOAT ? d : l;
case 16: fatal("long double is not yet supported");
}
assert(0);
}
/* functions */
static void emittype(struct type *);
static void emitname(struct value *);
static void emitvalue(struct value *);
static void
functemp(struct func *f, struct value *v)
{
v->kind = VALUE_TEMP;
v->u.name = NULL;
v->id = ++f->lastid;
}
static const char *const instname[] = {
#define OP(op, name) [op] = name,
#include "ops.h"
#undef OP
};
static struct inst *
mkinst(struct func *f, int op, int class, struct value *arg0, struct value *arg1)
{
struct inst *inst;
inst = xmalloc(sizeof(*inst));
inst->kind = op;
inst->class = class;
inst->arg[0] = arg0;
inst->arg[1] = arg1;
if (class && op != IARG)
functemp(f, &inst->res);
else
inst->res.kind = VALUE_NONE;
return inst;
}
static struct value *
funcinst(struct func *f, int op, int class, struct value *arg0, struct value *arg1)
{
struct inst *inst;
struct block *b;
if (f->end->jump.kind) {
b = mkblock("dead");
funclabel(f, b);
}
inst = mkinst(f, op, class, arg0, arg1);
arrayaddptr(&f->end->insts, inst);
return &inst->res;
}
static struct value *
convert(struct func *f, struct type *dst, struct type *src, struct value *l)
{
enum instkind op;
struct value *r = NULL;
int class;
if (src->kind == TYPEPOINTER)
src = &typeulong;
if (dst->kind == TYPEPOINTER)
dst = &typeulong;
if (dst->kind == TYPEVOID)
return NULL;
if (!(src->prop & PROPREAL) || !(dst->prop & PROPREAL))
fatal("internal error; unsupported conversion");
if (dst->kind == TYPEBOOL) {
class = 'w';
if (src->prop & PROPINT) {
r = mkintconst(0);
switch (src->size) {
case 1: op = ICNEW, l = funcinst(f, IEXTUB, 'w', l, NULL); break;
case 2: op = ICNEW, l = funcinst(f, IEXTUH, 'w', l, NULL); break;
case 4: op = ICNEW; break;
case 8: op = ICNEL; break;
default:
fatal("internal error; unknown integer conversion");
return NULL; /* unreachable */
}
} else {
assert(src->prop & PROPFLOAT);
switch (src->size) {
case 4: op = ICNES, r = mkfltconst(VALUE_FLTCONST, 0); break;
case 8: op = ICNED, r = mkfltconst(VALUE_DBLCONST, 0); break;
default:
fatal("internal error; unknown floating point conversion");
return NULL; /* unreachable */
}
}
} else if (dst->prop & PROPINT) {
class = dst->size == 8 ? 'l' : 'w';
if (src->prop & PROPINT) {
if (dst->size <= src->size)
return l;
switch (src->size) {
case 4: op = src->u.basic.issigned ? IEXTSW : IEXTUW; break;
case 2: op = src->u.basic.issigned ? IEXTSH : IEXTUH; break;
case 1: op = src->u.basic.issigned ? IEXTSB : IEXTUB; break;
default:
fatal("internal error; unknown integer conversion");
return NULL; /* unreachable */
}
} else {
if (dst->u.basic.issigned)
op = src->size == 8 ? IDTOSI : ISTOSI;
else
op = src->size == 8 ? IDTOUI : ISTOUI;
}
} else {
class = dst->size == 8 ? 'd' : 's';
if (src->prop & PROPINT) {
if (src->u.basic.issigned)
op = src->size == 8 ? ISLTOF : ISWTOF;
else
op = src->size == 8 ? IULTOF : IUWTOF;
} else {
assert(src->prop & PROPFLOAT);
if (src->size == dst->size)
return l;
op = src->size < dst->size ? IEXTS : ITRUNCD;
}
}
return funcinst(f, op, class, l, r);
}
static void
calcvla(struct func *f, struct type *t)
{
struct value *length, *basesize;
if (!(t->prop & PROPVM))
return;
if (t->base)
calcvla(f, t->base);
if (t->kind == TYPEFUNC || t->size)
return;
assert(t->kind == TYPEARRAY);
if (!t->u.array.size) {
assert(t->base->size || t->base->kind == TYPEARRAY);
assert(t->u.array.length);
length = convert(f, &typeulong, t->u.array.length->type, funcexpr(f, t->u.array.length));
basesize = t->base->size ? mkintconst(t->base->size) : t->base->u.array.size;
t->u.array.size = funcinst(f, IMUL, 'l', length, basesize);
}
}
static void
funcalloc(struct func *f, struct decl *d)
{
enum instkind op;
struct block *end;
struct value *v;
int align;
assert(!d->type->incomplete);
calcvla(f, d->type);
end = f->end;
if (d->type->size) {
f->end = f->start;
v = mkintconst(d->type->size);
} else {
assert(d->type->kind == TYPEARRAY);
assert(d->type->u.array.size);
v = d->type->u.array.size;
}
align = d->u.obj.align;
switch (align) {
case 1:
case 2:
case 4: op = IALLOC4; break;
case 8: op = IALLOC8; break;
default: v = funcinst(f, IADD, ptrclass, v, mkintconst(align - 16)); /* fallthrough */
case 16: op = IALLOC16; break;
}
v = funcinst(f, op, ptrclass, v, NULL);
if (align > 16) {
/* TODO: implement alloc32 in QBE and use that instead */
v = funcinst(f, IADD, ptrclass, v, mkintconst(align - 16));
v = funcinst(f, IAND, ptrclass, v, mkintconst(-align));
}
d->value = v;
f->end = end;
}
static struct value *
funcbits(struct func *f, struct type *t, struct value *v, struct bitfield b)
{
int class, bits;
class = t->size <= 4 ? 'w' : 'l';
bits = b.after;
if (bits) {
bits += (t->size + 3 & ~3) - t->size << 3;
v = funcinst(f, ISHL, class, v, mkintconst(bits));
}
bits += b.before;
if (bits)
v = funcinst(f, t->u.basic.issigned ? ISAR : ISHR, class, v, mkintconst(bits));
return v;
}
static void
funccopy(struct func *f, struct value *dst, struct value *src, unsigned long long size, int align)
{
enum instkind load, store;
int class;
struct value *tmp, *inc;
unsigned long long off;
assert((align & align - 1) == 0);
class = 'w';
switch (align) {
case 1: load = ILOADUB, store = ISTOREB; break;
case 2: load = ILOADUH, store = ISTOREH; break;
case 4: load = ILOADW, store = ISTOREW; break;
default: load = ILOADL, store = ISTOREL, align = 8, class = 'l'; break;
}
inc = mkintconst(align);
off = 0;
for (;;) {
tmp = funcinst(f, load, class, src, NULL);
funcinst(f, store, 0, tmp, dst);
off += align;
if (off >= size)
break;
src = funcinst(f, IADD, ptrclass, src, inc);
dst = funcinst(f, IADD, ptrclass, dst, inc);
}
}
static struct value *
funcstore(struct func *f, struct type *t, enum typequal tq, struct lvalue lval, struct value *v)
{
struct value *r;
enum typeprop tp;
unsigned long long mask;
struct qbetype qt;
int bits;
if (tq & QUALVOLATILE)
error(&tok.loc, "volatile store is not yet supported");
if (tq & QUALCONST)
error(&tok.loc, "cannot store to 'const' object");
tp = t->prop;
assert(!lval.bits.before && !lval.bits.after || tp & PROPINT);
r = v;
switch (t->kind) {
case TYPESTRUCT:
case TYPEUNION:
case TYPEARRAY:
funccopy(f, lval.addr, v, t->size, t->align);
break;
case TYPEPOINTER:
t = &typeulong;
/* fallthrough */
default:
assert(tp & PROPSCALAR);
qt = qbetype(t);
bits = lval.bits.before + lval.bits.after;
if (bits) {
mask = 0xffffffffffffffffu >> 64 - t->size * 8 + bits << lval.bits.before;
v = funcinst(f, ISHL, qt.base, v, mkintconst(lval.bits.before));
r = funcbits(f, t, v, lval.bits);
v = funcinst(f, IAND, qt.base, v, mkintconst(mask));
v = funcinst(f, IOR, qt.base, v,
funcinst(f, IAND, qt.base,
funcinst(f, qt.load, qt.base, lval.addr, NULL),
mkintconst(~mask)
)
);
}
funcinst(f, qt.store, 0, v, lval.addr);
break;
}
return r;
}
static struct value *
funcload(struct func *f, struct type *t, struct lvalue lval)
{
struct value *v;
struct qbetype qt;
switch (t->kind) {
case TYPESTRUCT:
case TYPEUNION:
case TYPEARRAY:
return lval.addr;
}
qt = qbetype(t);
v = funcinst(f, qt.load, qt.base, lval.addr, NULL);
return funcbits(f, t, v, lval.bits);
}
struct func *
mkfunc(struct decl *decl, char *name, struct type *t, struct scope *s)
{
struct func *f;
struct decl *d;
struct value *v;
f = xmalloc(sizeof(*f));
f->decl = decl;
f->name = name;
f->type = t;
f->start = f->end = mkblock("start");
f->lastid = 0;
mapinit(&f->gotos, 8);
emittype(t->base);
/* allocate space for parameters */
f->paramtemps = xreallocarray(NULL, t->u.func.nparam, sizeof *f->paramtemps);
for (d = t->u.func.params, v = f->paramtemps; d; d = d->next, ++v) {
emittype(d->type);
functemp(f, v);
if(!d->name)
continue;
if (d->type->value) {
d->value = v;
} else {
funcalloc(f, d);
funcstore(f, d->type, QUALNONE, (struct lvalue){d->value}, v);
}
}
t = mkarraytype(&typechar, QUALCONST, strlen(name) + 1);
d = mkdecl("__func__", DECLOBJECT, t, QUALNONE, LINKNONE);
d->u.obj.storage = SDSTATIC;
d->value = mkglobal(d);
scopeputdecl(s, d);
f->namedecl = d;
funclabel(f, mkblock("body"));
return f;
}
void
delfunc(struct func *f)
{
struct block *b;
struct inst **inst;
while (b = f->start) {
f->start = b->next;
arrayforeach (&b->insts, inst)
free(*inst);
free(b->insts.val);
free(b);
}
mapfree(&f->gotos, free);
free(f);
}
struct type *
functype(struct func *f)
{
return f->type;
}
void
funclabel(struct func *f, struct block *b)
{
f->end->next = b;
f->end = b;
}
void
funcjmp(struct func *f, struct block *l)
{
struct block *b = f->end;
if (!b->jump.kind) {
b->jump.kind = JUMP_JMP;
b->jump.blk[0] = l;
}
}
void
funcjnz(struct func *f, struct value *v, struct type *t, struct block *l1, struct block *l2)
{
struct block *b = f->end;
if (b->jump.kind)
return;
if (t) {
assert(t->prop & PROPSCALAR);
/*
Ideally we would just do this conversion unconditionally,
but QBE is not currently able to optimize the conversion
away for int.
*/
if (t->prop & PROPINT && t->size < 4)
v = convert(f, &typeint, t, v);
else if (t->prop & PROPFLOAT || t->size > 4)
v = convert(f, &typebool, t, v);
}
b->jump.kind = JUMP_JNZ;
b->jump.arg = v;
b->jump.blk[0] = l1;
b->jump.blk[1] = l2;
}
void
funcret(struct func *f, struct value *v)
{
struct block *b = f->end;
if (!b->jump.kind) {
b->jump.kind = JUMP_RET;
b->jump.arg = v;
}
}
void
funchlt(struct func *f)
{
struct block *b = f->end;
if (!b->jump.kind)
b->jump.kind = JUMP_HLT;
}
struct gotolabel *
funcgoto(struct func *f, char *name)
{
void **entry;
struct gotolabel *g;
struct mapkey key;
mapkey(&key, name, strlen(name));
entry = mapput(&f->gotos, &key);
g = *entry;
if (!g) {
g = xmalloc(sizeof(*g));
g->label = mkblock(name);
*entry = g;
}
return g;
}
static struct lvalue
funclval(struct func *f, struct expr *e)
{
struct lvalue lval = {0};
struct decl *d;
if (e->kind == EXPRBITFIELD) {
lval.bits = e->u.bitfield.bits;
e = e->base;
}
switch (e->kind) {
case EXPRIDENT:
d = e->u.ident.decl;
if (d->kind != DECLOBJECT && d->kind != DECLFUNC)
error(&tok.loc, "identifier '%s' is not an object or function", d->name);
if (d == f->namedecl) {
fputs("data ", stdout);
emitname(d->value);
printf(" = { b \"%s\", b 0 }\n", f->name);
f->namedecl = NULL;
}
lval.addr = d->value;
break;
case EXPRSTRING:
d = stringdecl(e);
lval.addr = d->value;
break;
case EXPRCOMPOUND:
if (e->toeval)
funcexpr(f, e->toeval);
d = e->u.compound.decl;
funcinit(f, d, e->u.compound.init, true);
lval.addr = d->value;
break;
case EXPRUNARY:
if (e->op != TMUL)
error(&tok.loc, "expression is not an object");
lval.addr = funcexpr(f, e->base);
break;
default:
if (e->type->kind != TYPESTRUCT && e->type->kind != TYPEUNION)
error(&tok.loc, "expression is not an object");
lval.addr = funcexpr(f, e);
}
return lval;
}
struct value *
funcexpr(struct func *f, struct expr *e)
{
enum instkind op = INONE;
struct decl *d;
struct value *l, *r, *v, **argvals;
struct lvalue lval;
struct expr *arg;
struct block *b[3];
struct type *t, *functype;
size_t i;
calcvla(f, e->type);
switch (e->kind) {
case EXPRIDENT:
d = e->u.ident.decl;
switch (d->kind) {
case DECLOBJECT: return funcload(f, e->type, (struct lvalue){d->value});
case DECLCONST: return d->value;
default:
fatal("unimplemented declaration kind %d", d->kind);
}
break;
case EXPRCONST:
t = e->type;
if (t->prop & PROPINT || t->kind == TYPEPOINTER)
return mkintconst(e->u.constant.u);
assert(t->prop & PROPFLOAT);
return mkfltconst(t->size == 4 ? VALUE_FLTCONST : VALUE_DBLCONST, e->u.constant.f);
case EXPRBITFIELD:
case EXPRCOMPOUND:
lval = funclval(f, e);
return funcload(f, e->type, lval);
case EXPRINCDEC:
lval = funclval(f, e->base);
l = funcload(f, e->base->type, lval);
t = e->type;
if (t->kind == TYPEPOINTER) {
r = mkintconst(t->base->size);
} else if (t->prop & PROPINT) {
r = mkintconst(1);
} else if (t->prop & PROPFLOAT) {
r = mkfltconst(t->size == 4 ? VALUE_FLTCONST : VALUE_DBLCONST, 1);
} else {
fatal("not a scalar");
return NULL; /* unreachable */
}
v = funcinst(f, e->op == TINC ? IADD : ISUB, qbetype(t).base, l, r);
v = funcstore(f, e->type, e->qual, lval, v);
return e->u.incdec.post ? l : v;
case EXPRCALL:
argvals = xreallocarray(NULL, e->u.call.nargs, sizeof(argvals[0]));
for (arg = e->u.call.args, i = 0; arg; arg = arg->next, ++i) {
emittype(arg->type);
argvals[i] = funcexpr(f, arg);
}
t = e->type;
emittype(t);
v = funcinst(f, ICALL, qbetype(t).base, funcexpr(f, e->base), t->value);
functype = e->base->type->base;
for (arg = e->u.call.args, i = 0; arg; arg = arg->next, ++i) {
if (functype->u.func.isvararg && i == functype->u.func.nparam)
funcinst(f, IVARARG, 0, NULL, NULL);
t = arg->type;
funcinst(f, IARG, qbetype(t).base, argvals[i], t->value);
}
e = e->base;
if (e->kind == EXPRUNARY && e->op == TBAND) {
e = e->base;
if (e->kind == EXPRIDENT && e->u.ident.decl->u.func.isnoreturn)
funchlt(f);
}
return v;
case EXPRUNARY:
switch (e->op) {
case TBAND:
lval = funclval(f, e->base);
return lval.addr;
case TMUL:
r = funcexpr(f, e->base);
return funcload(f, e->type, (struct lvalue){r});
case TSUB:
r = funcexpr(f, e->base);
return funcinst(f, INEG, qbetype(e->type).base, r, NULL);
}
fatal("internal error; unknown unary expression");
break;
case EXPRCAST:
if (e->toeval)
funcexpr(f, e->toeval);
l = funcexpr(f, e->base);
return convert(f, e->type, e->base->type, l);
case EXPRBINARY:
l = funcexpr(f, e->u.binary.l);
if (e->op == TLOR || e->op == TLAND) {
b[0] = mkblock("logic_right");
b[1] = mkblock("logic_join");
t = e->u.binary.l->type;
if (e->op == TLOR) {
funcjnz(f, l, t, b[1], b[0]);
b[1]->phi.val[0] = mkintconst(1);
} else {
funcjnz(f, l, t, b[0], b[1]);
b[1]->phi.val[0] = mkintconst(0);
}
b[1]->phi.blk[0] = f->end;
funclabel(f, b[0]);
r = funcexpr(f, e->u.binary.r);
b[1]->phi.val[1] = convert(f, &typebool, e->u.binary.r->type, r);
b[1]->phi.blk[1] = f->end;
funclabel(f, b[1]);
functemp(f, &b[1]->phi.res);
b[1]->phi.class = 'w';
return &b[1]->phi.res;
}
r = funcexpr(f, e->u.binary.r);
t = e->u.binary.l->type;
if (t->kind == TYPEPOINTER)
t = &typeulong;
switch (e->op) {
case TMUL:
op = IMUL;
break;
case TDIV:
op = !(t->prop & PROPINT) || t->u.basic.issigned ? IDIV : IUDIV;
break;
case TMOD:
op = t->u.basic.issigned ? IREM : IUREM;
break;
case TADD:
op = IADD;
break;
case TSUB:
op = ISUB;
break;
case TSHL:
op = ISHL;
break;
case TSHR:
op = t->u.basic.issigned ? ISAR : ISHR;
break;
case TBOR:
op = IOR;
break;
case TBAND:
op = IAND;
break;
case TXOR:
op = IXOR;
break;
case TLESS:
if (t->size <= 4)
op = t->prop & PROPFLOAT ? ICLTS : t->u.basic.issigned ? ICSLTW : ICULTW;
else
op = t->prop & PROPFLOAT ? ICLTD : t->u.basic.issigned ? ICSLTL : ICULTL;
break;
case TGREATER:
if (t->size <= 4)
op = t->prop & PROPFLOAT ? ICGTS : t->u.basic.issigned ? ICSGTW : ICUGTW;
else
op = t->prop & PROPFLOAT ? ICGTD : t->u.basic.issigned ? ICSGTL : ICUGTL;
break;
case TLEQ:
if (t->size <= 4)
op = t->prop & PROPFLOAT ? ICLES : t->u.basic.issigned ? ICSLEW : ICULEW;
else
op = t->prop & PROPFLOAT ? ICLED : t->u.basic.issigned ? ICSLEL : ICULEL;
break;
case TGEQ:
if (t->size <= 4)
op = t->prop & PROPFLOAT ? ICGES : t->u.basic.issigned ? ICSGEW : ICUGEW;
else
op = t->prop & PROPFLOAT ? ICGED : t->u.basic.issigned ? ICSGEL : ICUGEL;
break;
case TEQL:
if (t->size <= 4)
op = t->prop & PROPFLOAT ? ICEQS : ICEQW;
else
op = t->prop & PROPFLOAT ? ICEQD : ICEQL;
break;
case TNEQ:
if (t->size <= 4)
op = t->prop & PROPFLOAT ? ICNES : ICNEW;
else
op = t->prop & PROPFLOAT ? ICNED : ICNEL;
break;
}
if (op == INONE)
fatal("internal error; unimplemented binary expression");
return funcinst(f, op, qbetype(e->type).base, l, r);
case EXPRCOND:
b[0] = mkblock("cond_true");
b[1] = mkblock("cond_false");
b[2] = mkblock("cond_join");
v = funcexpr(f, e->base);
funcjnz(f, v, e->base->type, b[0], b[1]);
funclabel(f, b[0]);
b[2]->phi.val[0] = funcexpr(f, e->u.cond.t);
b[2]->phi.blk[0] = f->end;
funcjmp(f, b[2]);
funclabel(f, b[1]);
b[2]->phi.val[1] = funcexpr(f, e->u.cond.f);
b[2]->phi.blk[1] = f->end;
funclabel(f, b[2]);
if (e->type == &typevoid)
return NULL;
functemp(f, &b[2]->phi.res);
b[2]->phi.class = qbetype(e->type).base;
return &b[2]->phi.res;
case EXPRASSIGN:
r = funcexpr(f, e->u.assign.r);
if (e->u.assign.l->kind == EXPRTEMP) {
e->u.assign.l->u.temp = r;
} else {
lval = funclval(f, e->u.assign.l);
r = funcstore(f, e->u.assign.l->type, e->u.assign.l->qual, lval, r);
}
return r;
case EXPRCOMMA:
for (e = e->base; e->next; e = e->next)
funcexpr(f, e);
return funcexpr(f, e);
case EXPRBUILTIN:
switch (e->u.builtin.kind) {
case BUILTINVASTART:
l = funcexpr(f, e->base);
funcinst(f, IVASTART, 0, l, NULL);
break;
case BUILTINVAARG:
if (e->toeval)
funcexpr(f, e->toeval);
/* https://todo.sr.ht/~mcf/cproc/52 */
if (!(e->type->prop & PROPSCALAR))
error(&tok.loc, "va_arg with non-scalar type is not yet supported");
l = funcexpr(f, e->base);
return funcinst(f, IVAARG, qbetype(e->type).base, l, NULL);
case BUILTINALLOCA:
l = funcexpr(f, e->base);
return funcinst(f, IALLOC16, ptrclass, l, NULL);
case BUILTINUNREACHABLE:
return NULL;
default:
fatal("internal error: unimplemented builtin");
}
return NULL;
case EXPRTEMP:
assert(e->u.temp);
return e->u.temp;
case EXPRSIZEOF:
t = e->u.szof.type;
assert(t->kind == TYPEARRAY);
calcvla(f, t);
/* if the sizeof operand has VLA type, we must evaluate it */
if (e->base)
funcexpr(f, e->base);
return t->u.array.size;
}
fatal("unimplemented expression %d", e->kind);
return NULL;
}
static void
zero(struct func *func, struct value *addr, int align, unsigned long long offset, unsigned long long end)
{
static const enum instkind store[] = {
[1] = ISTOREB,
[2] = ISTOREH,
[4] = ISTOREW,
[8] = ISTOREL,
};
static struct value z = {.kind = VALUE_INTCONST};
struct value *tmp;
int a = 1;
while (offset < end) {
if ((align - (offset & align - 1)) & a) {
tmp = offset ? funcinst(func, IADD, ptrclass, addr, mkintconst(offset)) : addr;
funcinst(func, store[a], 0, &z, tmp);
offset += a;
}
if (a < align)
a <<= 1;
}
}
void
funcinit(struct func *func, struct decl *d, struct init *init, bool hasinit)
{
struct lvalue dst;
struct value *src, *v;
unsigned long long offset = 0, max = 0;
size_t i, w;
funcalloc(func, d);
if (!hasinit)
return;
for (; init; init = init->next) {
zero(func, d->value, d->type->align, offset, init->start);
dst.bits = init->bits;
if (init->expr->kind == EXPRSTRING) {