diff options
Diffstat (limited to 'src/tools/lcc/src/dag.c')
| -rw-r--r-- | src/tools/lcc/src/dag.c | 736 |
1 files changed, 736 insertions, 0 deletions
diff --git a/src/tools/lcc/src/dag.c b/src/tools/lcc/src/dag.c new file mode 100644 index 0000000..420cbe7 --- /dev/null +++ b/src/tools/lcc/src/dag.c @@ -0,0 +1,736 @@ +#include "c.h" + + +#define iscall(op) (generic(op) == CALL \ + || (IR->mulops_calls \ + && (generic(op)==DIV||generic(op)==MOD||generic(op)==MUL) \ + && ( optype(op)==U || optype(op)==I))) +static Node forest; +static struct dag { + struct node node; + struct dag *hlink; +} *buckets[16]; +int nodecount; +static Tree firstarg; +int assignargs = 1; +int prunetemps = -1; +static Node *tail; + +static int depth = 0; +static Node replace(Node); +static Node prune(Node); +static Node asgnnode(Symbol, Node); +static struct dag *dagnode(int, Node, Node, Symbol); +static Symbol equated(Symbol); +static void fixup(Node); +static void labelnode(int); +static void list(Node); +static void kill(Symbol); +static Node node(int, Node, Node, Symbol); +static void printdag1(Node, int, int); +static void printnode(Node, int, int); +static void reset(void); +static Node tmpnode(Node); +static void typestab(Symbol, void *); +static Node undag(Node); +static Node visit(Node, int); +static void unlist(void); +void walk(Tree tp, int tlab, int flab) { + listnodes(tp, tlab, flab); + if (forest) { + Node list = forest->link; + forest->link = NULL; + if (!IR->wants_dag) + list = undag(list); + code(Gen)->u.forest = list; + forest = NULL; + } + reset(); + deallocate(STMT); +} + +static Node node(int op, Node l, Node r, Symbol sym) { + int i; + struct dag *p; + + i = (opindex(op)^((unsigned long)sym>>2))&(NELEMS(buckets)-1); + for (p = buckets[i]; p; p = p->hlink) + if (p->node.op == op && p->node.syms[0] == sym + && p->node.kids[0] == l && p->node.kids[1] == r) + return &p->node; + p = dagnode(op, l, r, sym); + p->hlink = buckets[i]; + buckets[i] = p; + ++nodecount; + return &p->node; +} +static struct dag *dagnode(int op, Node l, Node r, Symbol sym) { + struct dag *p; + + NEW0(p, FUNC); + p->node.op = op; + if ((p->node.kids[0] = l) != NULL) + ++l->count; + if ((p->node.kids[1] = r) != NULL) + ++r->count; + p->node.syms[0] = sym; + return p; +} +Node newnode(int op, Node l, Node r, Symbol sym) { + return &dagnode(op, l, r, sym)->node; +} +static void kill(Symbol p) { + int i; + struct dag **q; + + for (i = 0; i < NELEMS(buckets); i++) + for (q = &buckets[i]; *q; ) + if (generic((*q)->node.op) == INDIR && + (!isaddrop((*q)->node.kids[0]->op) + || (*q)->node.kids[0]->syms[0] == p)) { + *q = (*q)->hlink; + --nodecount; + } else + q = &(*q)->hlink; +} +static void reset(void) { + if (nodecount > 0) + memset(buckets, 0, sizeof buckets); + nodecount = 0; +} +Node listnodes(Tree tp, int tlab, int flab) { + Node p = NULL, l, r; + int op; + + assert(tlab || flab || (tlab == 0 && flab == 0)); + if (tp == NULL) + return NULL; + if (tp->node) + return tp->node; + op = tp->op + sizeop(tp->type->size); + switch (generic(tp->op)) { + case AND: { if (depth++ == 0) reset(); + if (flab) { + listnodes(tp->kids[0], 0, flab); + listnodes(tp->kids[1], 0, flab); + } else { + listnodes(tp->kids[0], 0, flab = genlabel(1)); + listnodes(tp->kids[1], tlab, 0); + labelnode(flab); + } + depth--; } break; + case OR: { if (depth++ == 0) + reset(); + if (tlab) { + listnodes(tp->kids[0], tlab, 0); + listnodes(tp->kids[1], tlab, 0); + } else { + tlab = genlabel(1); + listnodes(tp->kids[0], tlab, 0); + listnodes(tp->kids[1], 0, flab); + labelnode(tlab); + } + depth--; + } break; + case NOT: { return listnodes(tp->kids[0], flab, tlab); } + case COND: { Tree q = tp->kids[1]; + assert(tlab == 0 && flab == 0); + if (tp->u.sym) + addlocal(tp->u.sym); + flab = genlabel(2); + listnodes(tp->kids[0], 0, flab); + assert(q && q->op == RIGHT); + reset(); + listnodes(q->kids[0], 0, 0); + if (forest->op == LABEL+V) { + equatelab(forest->syms[0], findlabel(flab + 1)); + unlist(); + } + list(jump(flab + 1)); + labelnode(flab); + listnodes(q->kids[1], 0, 0); + if (forest->op == LABEL+V) { + equatelab(forest->syms[0], findlabel(flab + 1)); + unlist(); + } + labelnode(flab + 1); + + if (tp->u.sym) + p = listnodes(idtree(tp->u.sym), 0, 0); } break; + case CNST: { Type ty = unqual(tp->type); + assert(ty->u.sym); + if (tlab || flab) { + assert(ty == inttype); + if (tlab && tp->u.v.i != 0) + list(jump(tlab)); + else if (flab && tp->u.v.i == 0) + list(jump(flab)); + } + else if (ty->u.sym->addressed) + p = listnodes(cvtconst(tp), 0, 0); + else + p = node(op, NULL, NULL, constant(ty, tp->u.v)); } break; + case RIGHT: { if ( tp->kids[0] && tp->kids[1] + && generic(tp->kids[1]->op) == ASGN + && ((generic(tp->kids[0]->op) == INDIR + && tp->kids[0]->kids[0] == tp->kids[1]->kids[0]) + || (tp->kids[0]->op == FIELD + && tp->kids[0] == tp->kids[1]->kids[0]))) { + assert(tlab == 0 && flab == 0); + if (generic(tp->kids[0]->op) == INDIR) { + p = listnodes(tp->kids[0], 0, 0); + list(p); + listnodes(tp->kids[1], 0, 0); + } + else { + assert(generic(tp->kids[0]->kids[0]->op) == INDIR); + list(listnodes(tp->kids[0]->kids[0], 0, 0)); + p = listnodes(tp->kids[0], 0, 0); + listnodes(tp->kids[1], 0, 0); + } + } else if (tp->kids[1]) { + listnodes(tp->kids[0], 0, 0); + p = listnodes(tp->kids[1], tlab, flab); + } else + p = listnodes(tp->kids[0], tlab, flab); } break; + case JUMP: { assert(tlab == 0 && flab == 0); + assert(tp->u.sym == 0); + assert(tp->kids[0]); + l = listnodes(tp->kids[0], 0, 0); + list(newnode(JUMP+V, l, NULL, NULL)); + reset(); } break; + case CALL: { Tree save = firstarg; + firstarg = NULL; + assert(tlab == 0 && flab == 0); + if (tp->op == CALL+B && !IR->wants_callb) { + Tree arg0 = tree(ARG+P, tp->kids[1]->type, + tp->kids[1], NULL); + if (IR->left_to_right) + firstarg = arg0; + l = listnodes(tp->kids[0], 0, 0); + if (!IR->left_to_right || firstarg) { + firstarg = NULL; + listnodes(arg0, 0, 0); + } + p = newnode(CALL+V, l, NULL, NULL); + } else { + l = listnodes(tp->kids[0], 0, 0); + r = listnodes(tp->kids[1], 0, 0); + p = newnode(tp->op == CALL+B ? tp->op : op, l, r, NULL); + } + NEW0(p->syms[0], FUNC); + assert(isptr(tp->kids[0]->type)); + assert(isfunc(tp->kids[0]->type->type)); + p->syms[0]->type = tp->kids[0]->type->type; + list(p); + reset(); + cfunc->u.f.ncalls++; + firstarg = save; + } break; + case ARG: { assert(tlab == 0 && flab == 0); + if (IR->left_to_right) + listnodes(tp->kids[1], 0, 0); + if (firstarg) { + Tree arg = firstarg; + firstarg = NULL; + listnodes(arg, 0, 0); + } + l = listnodes(tp->kids[0], 0, 0); + list(newnode(tp->op == ARG+B ? tp->op : op, l, NULL, NULL)); + forest->syms[0] = intconst(tp->type->size); + forest->syms[1] = intconst(tp->type->align); + if (!IR->left_to_right) + listnodes(tp->kids[1], 0, 0); } break; + case EQ: case NE: case GT: case GE: case LE: + case LT: { assert(tp->u.sym == 0); + assert(errcnt || tlab || flab); + l = listnodes(tp->kids[0], 0, 0); + r = listnodes(tp->kids[1], 0, 0); + assert(errcnt || opkind(l->op) == opkind(r->op)); + assert(errcnt || optype(op) == optype(l->op)); + if (tlab) + assert(flab == 0), + list(newnode(generic(tp->op) + opkind(l->op), l, r, findlabel(tlab))); + else if (flab) { + switch (generic(tp->op)) { + case EQ: op = NE; break; + case NE: op = EQ; break; + case GT: op = LE; break; + case LT: op = GE; break; + case GE: op = LT; break; + case LE: op = GT; break; + default: assert(0); + } + list(newnode(op + opkind(l->op), l, r, findlabel(flab))); + } + if (forest && forest->syms[0]) + forest->syms[0]->ref++; } break; + case ASGN: { assert(tlab == 0 && flab == 0); + if (tp->kids[0]->op == FIELD) { + Tree x = tp->kids[0]->kids[0]; + Field f = tp->kids[0]->u.field; + assert(generic(x->op) == INDIR); + reset(); + l = listnodes(lvalue(x), 0, 0); + if (fieldsize(f) < 8*f->type->size) { + unsigned int fmask = fieldmask(f); + unsigned int mask = fmask<<fieldright(f); + Tree q = tp->kids[1]; + if ((q->op == CNST+I && q->u.v.i == 0) + || (q->op == CNST+U && q->u.v.u == 0)) + q = bittree(BAND, x, cnsttree(unsignedtype, (unsigned long)~mask)); + else if ((q->op == CNST+I && (q->u.v.i&fmask) == fmask) + || (q->op == CNST+U && (q->u.v.u&fmask) == fmask)) + q = bittree(BOR, x, cnsttree(unsignedtype, (unsigned long)mask)); + else { + listnodes(q, 0, 0); + q = bittree(BOR, + bittree(BAND, rvalue(lvalue(x)), + cnsttree(unsignedtype, (unsigned long)~mask)), + bittree(BAND, shtree(LSH, cast(q, unsignedtype), + cnsttree(unsignedtype, (unsigned long)fieldright(f))), + cnsttree(unsignedtype, (unsigned long)mask))); + } + r = listnodes(q, 0, 0); + op = ASGN + ttob(q->type); + } else { + r = listnodes(tp->kids[1], 0, 0); + op = ASGN + ttob(tp->kids[1]->type); + } + } else { + l = listnodes(tp->kids[0], 0, 0); + r = listnodes(tp->kids[1], 0, 0); + } + list(newnode(tp->op == ASGN+B ? tp->op : op, l, r, NULL)); + forest->syms[0] = intconst(tp->kids[1]->type->size); + forest->syms[1] = intconst(tp->kids[1]->type->align); + if (isaddrop(tp->kids[0]->op) + && !tp->kids[0]->u.sym->computed) + kill(tp->kids[0]->u.sym); + else + reset(); + p = listnodes(tp->kids[1], 0, 0); } break; + case BOR: case BAND: case BXOR: + case ADD: case SUB: case RSH: + case LSH: { assert(tlab == 0 && flab == 0); + l = listnodes(tp->kids[0], 0, 0); + r = listnodes(tp->kids[1], 0, 0); + p = node(op, l, r, NULL); } break; + case DIV: case MUL: + case MOD: { assert(tlab == 0 && flab == 0); + l = listnodes(tp->kids[0], 0, 0); + r = listnodes(tp->kids[1], 0, 0); + p = node(op, l, r, NULL); + if (IR->mulops_calls && isint(tp->type)) { + list(p); + cfunc->u.f.ncalls++; + } } break; + case RET: { assert(tlab == 0 && flab == 0); + l = listnodes(tp->kids[0], 0, 0); + list(newnode(op, l, NULL, NULL)); } break; + case CVF: case CVI: case CVP: + case CVU: { assert(tlab == 0 && flab == 0); + assert(optype(tp->kids[0]->op) != optype(tp->op) || tp->kids[0]->type->size != tp->type->size); + l = listnodes(tp->kids[0], 0, 0); + p = node(op, l, NULL, intconst(tp->kids[0]->type->size)); + } break; + case BCOM: + case NEG: { assert(tlab == 0 && flab == 0); + l = listnodes(tp->kids[0], 0, 0); + p = node(op, l, NULL, NULL); } break; + case INDIR: { Type ty = tp->kids[0]->type; + assert(tlab == 0 && flab == 0); + l = listnodes(tp->kids[0], 0, 0); + if (isptr(ty)) + ty = unqual(ty)->type; + if (isvolatile(ty) + || (isstruct(ty) && unqual(ty)->u.sym->u.s.vfields)) + p = newnode(tp->op == INDIR+B ? tp->op : op, l, NULL, NULL); + else + p = node(tp->op == INDIR+B ? tp->op : op, l, NULL, NULL); } break; + case FIELD: { Tree q = tp->kids[0]; + if (tp->type == inttype) { + long n = fieldleft(tp->u.field); + q = shtree(RSH, + shtree(LSH, q, cnsttree(inttype, n)), + cnsttree(inttype, n + fieldright(tp->u.field))); + } else if (fieldsize(tp->u.field) < 8*tp->u.field->type->size) + q = bittree(BAND, + shtree(RSH, q, cnsttree(inttype, (long)fieldright(tp->u.field))), + cnsttree(unsignedtype, (unsigned long)fieldmask(tp->u.field))); + assert(tlab == 0 && flab == 0); + p = listnodes(q, 0, 0); } break; + case ADDRG: + case ADDRF: { assert(tlab == 0 && flab == 0); + p = node(tp->op + sizeop(voidptype->size), NULL, NULL, tp->u.sym); + } break; + case ADDRL: { assert(tlab == 0 && flab == 0); + if (tp->u.sym->temporary) + addlocal(tp->u.sym); + p = node(tp->op + sizeop(voidptype->size), NULL, NULL, tp->u.sym); } break; + default:assert(0); + } + tp->node = p; + return p; +} +static void list(Node p) { + if (p && p->link == NULL) { + if (forest) { + p->link = forest->link; + forest->link = p; + } else + p->link = p; + forest = p; + } +} +static void labelnode(int lab) { + assert(lab); + if (forest && forest->op == LABEL+V) + equatelab(findlabel(lab), forest->syms[0]); + else + list(newnode(LABEL+V, NULL, NULL, findlabel(lab))); + reset(); +} +static void unlist(void) { + Node p; + + assert(forest); + assert(forest != forest->link); + p = forest->link; + while (p->link != forest) + p = p->link; + p->link = forest->link; + forest = p; +} +Tree cvtconst(Tree p) { + Symbol q = constant(p->type, p->u.v); + Tree e; + + if (q->u.c.loc == NULL) + q->u.c.loc = genident(STATIC, p->type, GLOBAL); + if (isarray(p->type)) { + e = simplify(ADDRG, atop(p->type), NULL, NULL); + e->u.sym = q->u.c.loc; + } else + e = idtree(q->u.c.loc); + return e; +} +void gencode(Symbol caller[], Symbol callee[]) { + Code cp; + Coordinate save; + + if (prunetemps == -1) + prunetemps = !IR->wants_dag; + save = src; + if (assignargs) { + int i; + Symbol p, q; + cp = codehead.next->next; + codelist = codehead.next; + for (i = 0; (p = callee[i]) != NULL + && (q = caller[i]) != NULL; i++) + if (p->sclass != q->sclass || p->type != q->type) + walk(asgn(p, idtree(q)), 0, 0); + codelist->next = cp; + cp->prev = codelist; + } + if (glevel && IR->stabsym) { + int i; + Symbol p, q; + for (i = 0; (p = callee[i]) != NULL + && (q = caller[i]) != NULL; i++) { + (*IR->stabsym)(p); + if (p->sclass != q->sclass || p->type != q->type) + (*IR->stabsym)(q); + } + swtoseg(CODE); + } + cp = codehead.next; + for ( ; errcnt <= 0 && cp; cp = cp->next) + switch (cp->kind) { + case Address: (*IR->address)(cp->u.addr.sym, cp->u.addr.base, + cp->u.addr.offset); break; + case Blockbeg: { + Symbol *p = cp->u.block.locals; + (*IR->blockbeg)(&cp->u.block.x); + for ( ; *p; p++) + if ((*p)->ref != 0.0) + (*IR->local)(*p); + else if (glevel) (*IR->local)(*p); + } + break; + case Blockend: (*IR->blockend)(&cp->u.begin->u.block.x); break; + case Defpoint: src = cp->u.point.src; break; + case Gen: case Jump: + case Label: if (prunetemps) + cp->u.forest = prune(cp->u.forest); + fixup(cp->u.forest); + cp->u.forest = (*IR->gen)(cp->u.forest); break; + case Local: (*IR->local)(cp->u.var); break; + case Switch: break; + default: assert(0); + } + src = save; +} +static void fixup(Node p) { + for ( ; p; p = p->link) + switch (generic(p->op)) { + case JUMP: + if (specific(p->kids[0]->op) == ADDRG+P) + p->kids[0]->syms[0] = + equated(p->kids[0]->syms[0]); + break; + case LABEL: assert(p->syms[0] == equated(p->syms[0])); break; + case EQ: case GE: case GT: case LE: case LT: case NE: + assert(p->syms[0]); + p->syms[0] = equated(p->syms[0]); + } +} +static Symbol equated(Symbol p) { + { Symbol q; for (q = p->u.l.equatedto; q; q = q->u.l.equatedto) assert(p != q); } + while (p->u.l.equatedto) + p = p->u.l.equatedto; + return p; +} +void emitcode(void) { + Code cp; + Coordinate save; + + save = src; + cp = codehead.next; + for ( ; errcnt <= 0 && cp; cp = cp->next) + switch (cp->kind) { + case Address: break; + case Blockbeg: if (glevel && IR->stabblock) { + (*IR->stabblock)('{', cp->u.block.level - LOCAL, cp->u.block.locals); + swtoseg(CODE); + } + break; + case Blockend: if (glevel && IR->stabblock) { + Code bp = cp->u.begin; + foreach(bp->u.block.identifiers, bp->u.block.level, typestab, NULL); + foreach(bp->u.block.types, bp->u.block.level, typestab, NULL); + (*IR->stabblock)('}', bp->u.block.level - LOCAL, bp->u.block.locals); + swtoseg(CODE); + } + break; + case Defpoint: src = cp->u.point.src; + if (glevel > 0 && IR->stabline) { + (*IR->stabline)(&cp->u.point.src); swtoseg(CODE); } break; + case Gen: case Jump: + case Label: if (cp->u.forest) + (*IR->emit)(cp->u.forest); break; + case Local: if (glevel && IR->stabsym) { + (*IR->stabsym)(cp->u.var); + swtoseg(CODE); + } break; + case Switch: { int i; + defglobal(cp->u.swtch.table, LIT); + (*IR->defaddress)(equated(cp->u.swtch.labels[0])); + for (i = 1; i < cp->u.swtch.size; i++) { + long k = cp->u.swtch.values[i-1]; + while (++k < cp->u.swtch.values[i]) + assert(k < LONG_MAX), + (*IR->defaddress)(equated(cp->u.swtch.deflab)); + (*IR->defaddress)(equated(cp->u.swtch.labels[i])); + } + swtoseg(CODE); + } break; + default: assert(0); + } + src = save; +} + +static Node undag(Node forest) { + Node p; + + tail = &forest; + for (p = forest; p; p = p->link) + if (generic(p->op) == INDIR) { + assert(p->count >= 1); + visit(p, 1); + if (p->syms[2]) { + assert(p->syms[2]->u.t.cse); + p->syms[2]->u.t.cse = NULL; + addlocal(p->syms[2]); + } + } else if (iscall(p->op) && p->count >= 1) + visit(p, 1); + else { + assert(p->count == 0), + visit(p, 1); + *tail = p; + tail = &p->link; + } + *tail = NULL; + return forest; +} +static Node replace(Node p) { + if (p && ( generic(p->op) == INDIR + && generic(p->kids[0]->op) == ADDRL + && p->kids[0]->syms[0]->temporary + && p->kids[0]->syms[0]->u.t.replace)) { + p = p->kids[0]->syms[0]->u.t.cse; + if (generic(p->op) == INDIR && isaddrop(p->kids[0]->op)) + p = newnode(p->op, newnode(p->kids[0]->op, NULL, NULL, + p->kids[0]->syms[0]), NULL, NULL); + else if (generic(p->op) == ADDRG) + p = newnode(p->op, NULL, NULL, p->syms[0]); + else + assert(0); + p->count = 1; + } else if (p) { + p->kids[0] = replace(p->kids[0]); + p->kids[1] = replace(p->kids[1]); + } + return p; +} +static Node prune(Node forest) { + Node p, *tail = &forest; + int count = 0; + + for (p = forest; p; p = p->link) { + if (count > 0) { + p->kids[0] = replace(p->kids[0]); + p->kids[1] = replace(p->kids[1]); + } + if (( generic(p->op) == ASGN + && generic(p->kids[0]->op) == ADDRL + && p->kids[0]->syms[0]->temporary + && p->kids[0]->syms[0]->u.t.cse == p->kids[1])) { + Symbol tmp = p->kids[0]->syms[0]; + if (!tmp->defined) + (*IR->local)(tmp); + tmp->defined = 1; + if (( generic(p->kids[1]->op) == INDIR + && isaddrop(p->kids[1]->kids[0]->op) + && p->kids[1]->kids[0]->syms[0]->sclass == REGISTER) + || (( generic(p->kids[1]->op) == INDIR + && isaddrop(p->kids[1]->kids[0]->op)) && tmp->sclass == AUTO) + || (generic(p->kids[1]->op) == ADDRG && tmp->sclass == AUTO)) { + tmp->u.t.replace = 1; + count++; + continue; /* and omit the assignment */ + } + } + /* keep the assignment and other roots */ + *tail = p; + tail = &(*tail)->link; + } + assert(*tail == NULL); + return forest; +} +static Node visit(Node p, int listed) { + if (p) { + if (p->syms[2]) + p = tmpnode(p); + else if ((p->count <= 1 && !iscall(p->op)) + || (p->count == 0 && iscall(p->op))) { + p->kids[0] = visit(p->kids[0], 0); + p->kids[1] = visit(p->kids[1], 0); + } + + else if (specific(p->op) == ADDRL+P || specific(p->op) == ADDRF+P) { + assert(!listed); + p = newnode(p->op, NULL, NULL, p->syms[0]); + p->count = 1; + } + else if (p->op == INDIR+B) { + p = newnode(p->op, p->kids[0], NULL, NULL); + p->count = 1; + p->kids[0] = visit(p->kids[0], 0); + p->kids[1] = visit(p->kids[1], 0); + } + else { + p->kids[0] = visit(p->kids[0], 0); + p->kids[1] = visit(p->kids[1], 0); + p->syms[2] = temporary(REGISTER, btot(p->op, opsize(p->op))); + assert(!p->syms[2]->defined); + p->syms[2]->ref = 1; + p->syms[2]->u.t.cse = p; + + *tail = asgnnode(p->syms[2], p); + tail = &(*tail)->link; + if (!listed) + p = tmpnode(p); + }; + } + return p; +} +static Node tmpnode(Node p) { + Symbol tmp = p->syms[2]; + + assert(tmp); + if (--p->count == 0) + p->syms[2] = NULL; + p = newnode(INDIR + ttob(tmp->type), + newnode(ADDRL + ttob(voidptype), NULL, NULL, tmp), NULL, NULL); + p->count = 1; + return p; +} +static Node asgnnode(Symbol tmp, Node p) { + p = newnode(ASGN + ttob(tmp->type), + newnode(ADDRL + ttob(voidptype), NULL, NULL, tmp), p, NULL); + p->syms[0] = intconst(tmp->type->size); + p->syms[1] = intconst(tmp->type->align); + return p; +} +/* printdag - print dag p on fd, or the node list if p == 0 */ +void printdag(Node p, int fd) { + FILE *f = fd == 1 ? stdout : stderr; + + printed(0); + if (p == 0) { + if ((p = forest) != NULL) + do { + p = p->link; + printdag1(p, fd, 0); + } while (p != forest); + } else if (*printed(nodeid((Tree)p))) + fprint(f, "node'%d printed above\n", nodeid((Tree)p)); + else + printdag1(p, fd, 0); +} + +/* printdag1 - recursively print dag p */ +static void printdag1(Node p, int fd, int lev) { + int id, i; + + if (p == 0 || *printed(id = nodeid((Tree)p))) + return; + *printed(id) = 1; + for (i = 0; i < NELEMS(p->kids); i++) + printdag1(p->kids[i], fd, lev + 1); + printnode(p, fd, lev); +} + +/* printnode - print fields of dag p */ +static void printnode(Node p, int fd, int lev) { + if (p) { + FILE *f = fd == 1 ? stdout : stderr; + int i, id = nodeid((Tree)p); + fprint(f, "%c%d%s", lev == 0 ? '\'' : '#', id, + &" "[id < 10 ? 0 : id < 100 ? 1 : 2]); + fprint(f, "%s count=%d", opname(p->op), p->count); + for (i = 0; i < NELEMS(p->kids) && p->kids[i]; i++) + fprint(f, " #%d", nodeid((Tree)p->kids[i])); + if (generic(p->op) == CALL && p->syms[0] && p->syms[0]->type) + fprint(f, " {%t}", p->syms[0]->type); + else + for (i = 0; i < NELEMS(p->syms) && p->syms[i]; i++) + if (p->syms[i]->name) + fprint(f, " %s", p->syms[i]->name); + else + fprint(f, " %p", p->syms[i]); + fprint(f, "\n"); + } +} + +/* typestab - emit stab entries for p */ +static void typestab(Symbol p, void *cl) { + if (!isfunc(p->type) && (p->sclass == EXTERN || p->sclass == STATIC) && IR->stabsym) + (*IR->stabsym)(p); + else if ((p->sclass == TYPEDEF || p->sclass == 0) && IR->stabtype) + (*IR->stabtype)(p); +} + |