4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
27 * DWARF to tdata conversion
29 * For the most part, conversion is straightforward, proceeding in two passes.
30 * On the first pass, we iterate through every die, creating new type nodes as
31 * necessary. Referenced tdesc_t's are created in an uninitialized state, thus
32 * allowing type reference pointers to be filled in. If the tdesc_t
33 * corresponding to a given die can be completely filled out (sizes and offsets
34 * calculated, and so forth) without using any referenced types, the tdesc_t is
35 * marked as resolved. Consider an array type. If the type corresponding to
36 * the array contents has not yet been processed, we will create a blank tdesc
37 * for the contents type (only the type ID will be filled in, relying upon the
38 * later portion of the first pass to encounter and complete the referenced
39 * type). We will then attempt to determine the size of the array. If the
40 * array has a byte size attribute, we will have completely characterized the
41 * array type, and will be able to mark it as resolved. The lack of a byte
42 * size attribute, on the other hand, will prevent us from fully resolving the
43 * type, as the size will only be calculable with reference to the contents
44 * type, which has not, as yet, been encountered. The array type will thus be
45 * left without the resolved flag, and the first pass will continue.
47 * When we begin the second pass, we will have created tdesc_t nodes for every
48 * type in the section. We will traverse the tree, from the iidescs down,
49 * processing each unresolved node. As the referenced nodes will have been
50 * populated, the array type used in our example above will be able to use the
51 * size of the referenced types (if available) to determine its own type. The
52 * traversal will be repeated until all types have been resolved or we have
53 * failed to make progress. When all tdescs have been resolved, the conversion
56 * There are, as always, a few special cases that are handled during the first
59 * 1. Empty enums - GCC will occasionally emit an enum without any members.
60 * Later on in the file, it will emit the same enum type, though this time
61 * with the full complement of members. All references to the memberless
62 * enum need to be redirected to the full definition. During the first
63 * pass, each enum is entered in dm_enumhash, along with a pointer to its
64 * corresponding tdesc_t. If, during the second pass, we encounter a
65 * memberless enum, we use the hash to locate the full definition. All
66 * tdescs referencing the empty enum are then redirected.
68 * 2. Forward declarations - If the compiler sees a forward declaration for
69 * a structure, followed by the definition of that structure, it will emit
70 * DWARF data for both the forward declaration and the definition. We need
71 * to resolve the forward declarations when possible, by redirecting
72 * forward-referencing tdescs to the actual struct/union definitions. This
73 * redirection is done completely within the first pass. We begin by
74 * recording all forward declarations in dw_fwdhash. When we define a
75 * structure, we check to see if there have been any corresponding forward
76 * declarations. If so, we redirect the tdescs which referenced the forward
77 * declarations to the structure or union definition.
79 * XXX see if a post traverser will allow the elimination of repeated pass 2
93 #include "ctf_headers.h"
99 /* The version of DWARF which we support. */
100 #define DWARF_VERSION 2
103 * We need to define a couple of our own intrinsics, to smooth out some of the
104 * differences between the GCC and DevPro DWARF emitters. See the referenced
105 * routines and the special cases in the file comment for more details.
107 * Type IDs are 32 bits wide. We're going to use the top of that field to
108 * indicate types that we've created ourselves.
110 #define TID_FILEMAX 0x3fffffff /* highest tid from file */
111 #define TID_VOID 0x40000001 /* see die_void() */
112 #define TID_LONG 0x40000002 /* see die_array() */
114 #define TID_MFGTID_BASE 0x40000003 /* first mfg'd tid */
117 * To reduce the staggering amount of error-handling code that would otherwise
118 * be required, the attribute-retrieval routines handle most of their own
119 * errors. If the following flag is supplied as the value of the `req'
120 * argument, they will also handle the absence of a requested attribute by
121 * terminating the program.
123 #define DW_ATTR_REQ 1
125 #define TDESC_HASH_BUCKETS 511
127 typedef struct dwarf {
128 Dwarf_Debug dw_dw; /* for libdwarf */
129 Dwarf_Error dw_err; /* for libdwarf */
130 Dwarf_Off dw_maxoff; /* highest legal offset in this cu */
131 tdata_t *dw_td; /* root of the tdesc/iidesc tree */
132 hash_t *dw_tidhash; /* hash of tdescs by t_id */
133 hash_t *dw_fwdhash; /* hash of fwd decls by name */
134 hash_t *dw_enumhash; /* hash of memberless enums by name */
135 tdesc_t *dw_void; /* manufactured void type */
136 tdesc_t *dw_long; /* manufactured long type for arrays */
137 size_t dw_ptrsz; /* size of a pointer in this file */
138 tid_t dw_mfgtid_last; /* last mfg'd type ID used */
139 uint_t dw_nunres; /* count of unresolved types */
140 char *dw_cuname; /* name of compilation unit */
143 static void die_create_one(dwarf_t *, Dwarf_Die);
144 static void die_create(dwarf_t *, Dwarf_Die);
147 mfgtid_next(dwarf_t *dw)
149 return (++dw->dw_mfgtid_last);
153 tdesc_add(dwarf_t *dw, tdesc_t *tdp)
155 hash_add(dw->dw_tidhash, tdp);
159 tdesc_lookup(dwarf_t *dw, int tid)
166 if (hash_find(dw->dw_tidhash, &tmpl, &tdp))
173 * Resolve a tdesc down to a node which should have a size. Returns the size,
174 * zero if the size hasn't yet been determined.
177 tdesc_size(tdesc_t *tdp)
180 switch (tdp->t_type) {
188 return (tdp->t_size);
200 case 0: /* not yet defined */
204 terminate("tdp %u: tdesc_size on unknown type %d\n",
205 tdp->t_id, tdp->t_type);
211 tdesc_bitsize(tdesc_t *tdp)
214 switch (tdp->t_type) {
216 return (tdp->t_intr->intr_nbits);
224 return (tdp->t_size * NBBY);
236 case 0: /* not yet defined */
240 terminate("tdp %u: tdesc_bitsize on unknown type %d\n",
241 tdp->t_id, tdp->t_type);
247 tdesc_basetype(tdesc_t *tdp)
250 switch (tdp->t_type) {
257 case 0: /* not yet defined */
266 die_off(dwarf_t *dw, Dwarf_Die die)
270 if (dwarf_dieoffset(die, &off, &dw->dw_err) == DW_DLV_OK)
273 terminate("failed to get offset for die: %s\n",
274 dwarf_errmsg(&dw->dw_err));
280 die_sibling(dwarf_t *dw, Dwarf_Die die)
285 if ((rc = dwarf_siblingof(dw->dw_dw, die, &sib, &dw->dw_err)) ==
288 else if (rc == DW_DLV_NO_ENTRY)
291 terminate("die %llu: failed to find type sibling: %s\n",
292 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
298 die_child(dwarf_t *dw, Dwarf_Die die)
303 if ((rc = dwarf_child(die, &child, &dw->dw_err)) == DW_DLV_OK)
305 else if (rc == DW_DLV_NO_ENTRY)
308 terminate("die %llu: failed to find type child: %s\n",
309 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
315 die_tag(dwarf_t *dw, Dwarf_Die die)
319 if (dwarf_tag(die, &tag, &dw->dw_err) == DW_DLV_OK)
322 terminate("die %llu: failed to get tag for type: %s\n",
323 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
328 static Dwarf_Attribute
329 die_attr(dwarf_t *dw, Dwarf_Die die, Dwarf_Half name, int req)
331 Dwarf_Attribute attr;
334 if ((rc = dwarf_attr(die, name, &attr, &dw->dw_err)) == DW_DLV_OK) {
336 } else if (rc == DW_DLV_NO_ENTRY) {
338 terminate("die %llu: no attr 0x%x\n", die_off(dw, die),
345 terminate("die %llu: failed to get attribute for type: %s\n",
346 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
352 die_signed(dwarf_t *dw, Dwarf_Die die, Dwarf_Half name, Dwarf_Signed *valp,
356 if (dwarf_attrval_signed(die, name, valp, &dw->dw_err) != DWARF_E_NONE) {
358 terminate("die %llu: failed to get signed: %s\n",
359 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
367 die_unsigned(dwarf_t *dw, Dwarf_Die die, Dwarf_Half name, Dwarf_Unsigned *valp,
371 if (dwarf_attrval_unsigned(die, name, valp, &dw->dw_err) != DWARF_E_NONE) {
373 terminate("die %llu: failed to get unsigned: %s\n",
374 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
382 die_bool(dwarf_t *dw, Dwarf_Die die, Dwarf_Half name, Dwarf_Bool *valp, int req)
386 if (dwarf_attrval_flag(die, name, valp, &dw->dw_err) != DWARF_E_NONE) {
388 terminate("die %llu: failed to get flag: %s\n",
389 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
397 die_string(dwarf_t *dw, Dwarf_Die die, Dwarf_Half name, char **strp, int req)
399 const char *str = NULL;
401 if (dwarf_attrval_string(die, name, &str, &dw->dw_err) != DWARF_E_NONE ||
404 terminate("die %llu: failed to get string: %s\n",
405 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
410 *strp = xstrdup(str);
416 die_attr_ref(dwarf_t *dw, Dwarf_Die die, Dwarf_Half name)
420 if (dwarf_attrval_unsigned(die, name, &off, &dw->dw_err) != DWARF_E_NONE) {
421 terminate("die %llu: failed to get ref: %s\n",
422 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
429 die_name(dwarf_t *dw, Dwarf_Die die)
433 (void) die_string(dw, die, DW_AT_name, &str, 0);
439 die_isdecl(dwarf_t *dw, Dwarf_Die die)
443 return (die_bool(dw, die, DW_AT_declaration, &val, 0) && val);
447 die_isglobal(dwarf_t *dw, Dwarf_Die die)
453 * Some compilers (gcc) use DW_AT_external to indicate function
454 * visibility. Others (Sun) use DW_AT_visibility.
456 if (die_signed(dw, die, DW_AT_visibility, &vis, 0))
457 return (vis == DW_VIS_exported);
459 return (die_bool(dw, die, DW_AT_external, &ext, 0) && ext);
463 die_add(dwarf_t *dw, Dwarf_Off off)
465 tdesc_t *tdp = xcalloc(sizeof (tdesc_t));
475 die_lookup_pass1(dwarf_t *dw, Dwarf_Die die, Dwarf_Half name)
477 Dwarf_Off ref = die_attr_ref(dw, die, name);
480 if ((tdp = tdesc_lookup(dw, ref)) != NULL)
483 return (die_add(dw, ref));
487 die_mem_offset(dwarf_t *dw, Dwarf_Die die, Dwarf_Half name,
488 Dwarf_Unsigned *valp, int req __unused)
490 Dwarf_Locdesc *loc = NULL;
491 Dwarf_Signed locnum = 0;
495 if (name != DW_AT_data_member_location)
496 terminate("die %llu: can only process attribute "
497 "DW_AT_data_member_location\n", die_off(dw, die));
499 if ((at = die_attr(dw, die, name, 0)) == NULL)
502 if (dwarf_whatform(at, &form, &dw->dw_err) != DW_DLV_OK)
511 * GCC in base and Clang (3.3 or below) generates
512 * DW_AT_data_member_location attribute with DW_FORM_block*
513 * form. The attribute contains one DW_OP_plus_uconst
514 * operator. The member offset stores in the operand.
516 if (dwarf_locdesc(die, name, &loc, &locnum, &dw->dw_err) !=
519 if (locnum != 1 || loc->ld_s->lr_atom != DW_OP_plus_uconst) {
520 terminate("die %llu: cannot parse member offset\n",
523 *valp = loc->ld_s->lr_number;
532 * Clang 3.4 generates DW_AT_data_member_location attribute
533 * with DW_FORM_data* form (constant class). The attribute
534 * stores a contant value which is the member offset.
536 if (dwarf_attrval_unsigned(die, name, valp, &dw->dw_err) !=
542 terminate("die %llu: cannot parse member offset with form "
543 "%u\n", die_off(dw, die), form);
547 if (dwarf_locdesc_free(loc, &dw->dw_err) != DW_DLV_OK)
548 terminate("die %llu: cannot free location descriptor: %s\n",
549 die_off(dw, die), dwarf_errmsg(&dw->dw_err));
555 tdesc_intr_common(dwarf_t *dw, int tid, const char *name, size_t sz)
560 intr = xcalloc(sizeof (intr_t));
561 intr->intr_type = INTR_INT;
562 intr->intr_signed = 1;
563 intr->intr_nbits = sz * NBBY;
565 tdp = xcalloc(sizeof (tdesc_t));
566 tdp->t_name = xstrdup(name);
569 tdp->t_type = INTRINSIC;
571 tdp->t_flags = TDESC_F_RESOLVED;
579 * Manufacture a void type. Used for gcc-emitted stabs, where the lack of a
580 * type reference implies a reference to a void type. A void *, for example
581 * will be represented by a pointer die without a DW_AT_type. CTF requires
582 * that pointer nodes point to something, so we'll create a void for use as
583 * the target. Note that the DWARF data may already create a void type. Ours
584 * would then be a duplicate, but it'll be removed in the self-uniquification
585 * merge performed at the completion of DWARF->tdesc conversion.
588 tdesc_intr_void(dwarf_t *dw)
590 if (dw->dw_void == NULL)
591 dw->dw_void = tdesc_intr_common(dw, TID_VOID, "void", 0);
593 return (dw->dw_void);
597 tdesc_intr_long(dwarf_t *dw)
599 if (dw->dw_long == NULL) {
600 dw->dw_long = tdesc_intr_common(dw, TID_LONG, "long",
604 return (dw->dw_long);
608 * Used for creating bitfield types. We create a copy of an existing intrinsic,
609 * adjusting the size of the copy to match what the caller requested. The
610 * caller can then use the copy as the type for a bitfield structure member.
613 tdesc_intr_clone(dwarf_t *dw, tdesc_t *old, size_t bitsz)
615 tdesc_t *new = xcalloc(sizeof (tdesc_t));
617 if (!(old->t_flags & TDESC_F_RESOLVED)) {
618 terminate("tdp %u: attempt to make a bit field from an "
619 "unresolved type\n", old->t_id);
622 new->t_name = xstrdup(old->t_name);
623 new->t_size = old->t_size;
624 new->t_id = mfgtid_next(dw);
625 new->t_type = INTRINSIC;
626 new->t_flags = TDESC_F_RESOLVED;
628 new->t_intr = xcalloc(sizeof (intr_t));
629 bcopy(old->t_intr, new->t_intr, sizeof (intr_t));
630 new->t_intr->intr_nbits = bitsz;
638 tdesc_array_create(dwarf_t *dw, Dwarf_Die dim, tdesc_t *arrtdp,
643 tdesc_t *ctdp = NULL;
647 if ((dim2 = die_sibling(dw, dim)) == NULL) {
649 } else if (die_tag(dw, dim2) == DW_TAG_subrange_type) {
650 ctdp = xcalloc(sizeof (tdesc_t));
651 ctdp->t_id = mfgtid_next(dw);
652 debug(3, "die %llu: creating new type %u for sub-dimension\n",
653 die_off(dw, dim2), ctdp->t_id);
654 tdesc_array_create(dw, dim2, arrtdp, ctdp);
656 terminate("die %llu: unexpected non-subrange node in array\n",
660 dimtdp->t_type = ARRAY;
661 dimtdp->t_ardef = ar = xcalloc(sizeof (ardef_t));
664 * Array bounds can be signed or unsigned, but there are several kinds
665 * of signless forms (data1, data2, etc) that take their sign from the
666 * routine that is trying to interpret them. That is, data1 can be
667 * either signed or unsigned, depending on whether you use the signed or
668 * unsigned accessor function. GCC will use the signless forms to store
669 * unsigned values which have their high bit set, so we need to try to
670 * read them first as unsigned to get positive values. We could also
671 * try signed first, falling back to unsigned if we got a negative
674 if (die_unsigned(dw, dim, DW_AT_upper_bound, &uval, 0))
675 ar->ad_nelems = uval + 1;
676 else if (die_signed(dw, dim, DW_AT_upper_bound, &sval, 0))
677 ar->ad_nelems = sval + 1;
678 else if (die_unsigned(dw, dim, DW_AT_count, &uval, 0))
679 ar->ad_nelems = uval;
680 else if (die_signed(dw, dim, DW_AT_count, &sval, 0))
681 ar->ad_nelems = sval;
686 * Different compilers use different index types. Force the type to be
687 * a common, known value (long).
689 ar->ad_idxtype = tdesc_intr_long(dw);
690 ar->ad_contents = ctdp;
692 if (ar->ad_contents->t_size != 0) {
693 dimtdp->t_size = ar->ad_contents->t_size * ar->ad_nelems;
694 dimtdp->t_flags |= TDESC_F_RESOLVED;
699 * Create a tdesc from an array node. Some arrays will come with byte size
700 * attributes, and thus can be resolved immediately. Others don't, and will
701 * need to wait until the second pass for resolution.
704 die_array_create(dwarf_t *dw, Dwarf_Die arr, Dwarf_Off off, tdesc_t *tdp)
706 tdesc_t *arrtdp = die_lookup_pass1(dw, arr, DW_AT_type);
710 debug(3, "die %llu <%llx>: creating array\n", off, off);
712 if ((dim = die_child(dw, arr)) == NULL ||
713 die_tag(dw, dim) != DW_TAG_subrange_type)
714 terminate("die %llu: failed to retrieve array bounds\n", off);
716 tdesc_array_create(dw, dim, arrtdp, tdp);
718 if (die_unsigned(dw, arr, DW_AT_byte_size, &uval, 0)) {
722 /* Check for bogus gcc DW_AT_byte_size attribute */
723 if (uval == (unsigned)-1) {
724 printf("dwarf.c:%s() working around bogus -1 DW_AT_byte_size\n",
732 * Ensure that sub-dimensions have sizes too before marking
735 flags = TDESC_F_RESOLVED;
736 for (dimtdp = tdp->t_ardef->ad_contents;
737 dimtdp->t_type == ARRAY;
738 dimtdp = dimtdp->t_ardef->ad_contents) {
739 if (!(dimtdp->t_flags & TDESC_F_RESOLVED)) {
745 tdp->t_flags |= flags;
748 debug(3, "die %llu <%llx>: array nelems %u size %u\n", off, off,
749 tdp->t_ardef->ad_nelems, tdp->t_size);
754 die_array_resolve(tdesc_t *tdp, tdesc_t **tdpp __unused, void *private)
756 dwarf_t *dw = private;
759 if (tdp->t_flags & TDESC_F_RESOLVED)
762 debug(3, "trying to resolve array %d (cont %d)\n", tdp->t_id,
763 tdp->t_ardef->ad_contents->t_id);
765 if ((sz = tdesc_size(tdp->t_ardef->ad_contents)) == 0) {
766 debug(3, "unable to resolve array %s (%d) contents %d\n",
767 tdesc_name(tdp), tdp->t_id,
768 tdp->t_ardef->ad_contents->t_id);
774 tdp->t_size = sz * tdp->t_ardef->ad_nelems;
775 tdp->t_flags |= TDESC_F_RESOLVED;
777 debug(3, "resolved array %d: %u bytes\n", tdp->t_id, tdp->t_size);
784 die_array_failed(tdesc_t *tdp, tdesc_t **tdpp __unused, void *private __unused)
786 tdesc_t *cont = tdp->t_ardef->ad_contents;
788 if (tdp->t_flags & TDESC_F_RESOLVED)
791 fprintf(stderr, "Array %d: failed to size contents type %s (%d)\n",
792 tdp->t_id, tdesc_name(cont), cont->t_id);
798 * Most enums (those with members) will be resolved during this first pass.
799 * Others - those without members (see the file comment) - won't be, and will
800 * need to wait until the second pass when they can be matched with their full
804 die_enum_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp)
810 debug(3, "die %llu: creating enum\n", off);
814 (void) die_unsigned(dw, die, DW_AT_byte_size, &uval, DW_ATTR_REQ);
815 /* Check for bogus gcc DW_AT_byte_size attribute */
816 if (uval == (unsigned)-1) {
817 printf("dwarf.c:%s() working around bogus -1 DW_AT_byte_size\n",
823 if ((mem = die_child(dw, die)) != NULL) {
824 elist_t **elastp = &tdp->t_emem;
829 if (die_tag(dw, mem) != DW_TAG_enumerator) {
830 /* Nested type declaration */
831 die_create_one(dw, mem);
835 el = xcalloc(sizeof (elist_t));
836 el->el_name = die_name(dw, mem);
838 if (die_signed(dw, mem, DW_AT_const_value, &sval, 0)) {
839 el->el_number = sval;
840 } else if (die_unsigned(dw, mem, DW_AT_const_value,
842 el->el_number = uval;
844 terminate("die %llu: enum %llu: member without "
845 "value\n", off, die_off(dw, mem));
848 debug(3, "die %llu: enum %llu: created %s = %d\n", off,
849 die_off(dw, mem), el->el_name, el->el_number);
852 elastp = &el->el_next;
854 } while ((mem = die_sibling(dw, mem)) != NULL);
856 hash_add(dw->dw_enumhash, tdp);
858 tdp->t_flags |= TDESC_F_RESOLVED;
860 if (tdp->t_name != NULL) {
861 iidesc_t *ii = xcalloc(sizeof (iidesc_t));
862 ii->ii_type = II_SOU;
863 ii->ii_name = xstrdup(tdp->t_name);
866 iidesc_add(dw->dw_td->td_iihash, ii);
872 die_enum_match(void *arg1, void *arg2)
874 tdesc_t *tdp = arg1, **fullp = arg2;
876 if (tdp->t_emem != NULL) {
878 return (-1); /* stop the iteration */
886 die_enum_resolve(tdesc_t *tdp, tdesc_t **tdpp __unused, void *private)
888 dwarf_t *dw = private;
889 tdesc_t *full = NULL;
891 if (tdp->t_flags & TDESC_F_RESOLVED)
894 (void) hash_find_iter(dw->dw_enumhash, tdp, die_enum_match, &full);
897 * The answer to this one won't change from iteration to iteration,
901 terminate("tdp %u: enum %s has no members\n", tdp->t_id,
905 debug(3, "tdp %u: enum %s redirected to %u\n", tdp->t_id,
906 tdesc_name(tdp), full->t_id);
908 tdp->t_flags |= TDESC_F_RESOLVED;
914 die_fwd_map(void *arg1, void *arg2)
916 tdesc_t *fwd = arg1, *sou = arg2;
918 debug(3, "tdp %u: mapped forward %s to sou %u\n", fwd->t_id,
919 tdesc_name(fwd), sou->t_id);
926 * Structures and unions will never be resolved during the first pass, as we
927 * won't be able to fully determine the member sizes. The second pass, which
928 * have access to sizing information, will be able to complete the resolution.
931 die_sou_create(dwarf_t *dw, Dwarf_Die str, Dwarf_Off off, tdesc_t *tdp,
932 int type, const char *typename)
934 Dwarf_Unsigned sz, bitsz, bitoff, maxsz=0;
935 #if BYTE_ORDER == _LITTLE_ENDIAN
939 mlist_t *ml, **mlastp;
942 tdp->t_type = (die_isdecl(dw, str) ? FORWARD : type);
944 debug(3, "die %llu: creating %s %s\n", off,
945 (tdp->t_type == FORWARD ? "forward decl" : typename),
948 if (tdp->t_type == FORWARD) {
949 hash_add(dw->dw_fwdhash, tdp);
953 (void) hash_find_iter(dw->dw_fwdhash, tdp, die_fwd_map, tdp);
955 (void) die_unsigned(dw, str, DW_AT_byte_size, &sz, DW_ATTR_REQ);
959 * GCC allows empty SOUs as an extension.
961 if ((mem = die_child(dw, str)) == NULL) {
965 mlastp = &tdp->t_members;
968 Dwarf_Off memoff = die_off(dw, mem);
969 Dwarf_Half tag = die_tag(dw, mem);
970 Dwarf_Unsigned mloff;
972 if (tag != DW_TAG_member) {
973 /* Nested type declaration */
974 die_create_one(dw, mem);
978 debug(3, "die %llu: mem %llu: creating member\n", off, memoff);
980 ml = xcalloc(sizeof (mlist_t));
983 * This could be a GCC anon struct/union member, so we'll allow
984 * an empty name, even though nothing can really handle them
985 * properly. Note that some versions of GCC miss out debug
986 * info for anon structs, though recent versions are fixed (gcc
989 if ((ml->ml_name = die_name(dw, mem)) == NULL)
992 ml->ml_type = die_lookup_pass1(dw, mem, DW_AT_type);
993 debug(3, "die_sou_create(): ml_type = %p t_id = %d\n",
994 ml->ml_type, ml->ml_type->t_id);
996 if (die_mem_offset(dw, mem, DW_AT_data_member_location,
998 debug(3, "die %llu: got mloff %llx\n", off,
999 (u_longlong_t)mloff);
1000 ml->ml_offset = mloff * 8;
1003 if (die_unsigned(dw, mem, DW_AT_bit_size, &bitsz, 0))
1004 ml->ml_size = bitsz;
1006 ml->ml_size = tdesc_bitsize(ml->ml_type);
1008 if (die_unsigned(dw, mem, DW_AT_bit_offset, &bitoff, 0)) {
1009 #if BYTE_ORDER == _BIG_ENDIAN
1010 ml->ml_offset += bitoff;
1013 * Note that Clang 3.4 will sometimes generate
1014 * member DIE before generating the DIE for the
1015 * member's type. The code can not handle this
1016 * properly so that tdesc_bitsize(ml->ml_type) will
1017 * return 0 because ml->ml_type is unknown. As a
1018 * result, a wrong member offset will be calculated.
1019 * To workaround this, we can instead try to
1020 * retrieve the value of DW_AT_byte_size attribute
1021 * which stores the byte size of the space occupied
1022 * by the type. If this attribute exists, its value
1023 * should equal to tdesc_bitsize(ml->ml_type)/NBBY.
1025 if (die_unsigned(dw, mem, DW_AT_byte_size, &bysz, 0) &&
1027 ml->ml_offset += bysz * NBBY - bitoff -
1030 ml->ml_offset += tdesc_bitsize(ml->ml_type) -
1031 bitoff - ml->ml_size;
1035 debug(3, "die %llu: mem %llu: created \"%s\" (off %u sz %u)\n",
1036 off, memoff, ml->ml_name, ml->ml_offset, ml->ml_size);
1039 mlastp = &ml->ml_next;
1041 /* Find the size of the largest member to work around a gcc
1042 * bug. See GCC Bugzilla 35998.
1044 if (maxsz < ml->ml_size)
1045 maxsz = ml->ml_size;
1047 } while ((mem = die_sibling(dw, mem)) != NULL);
1049 /* See if we got a bogus DW_AT_byte_size. GCC will sometimes
1052 if (sz == (unsigned)-1) {
1053 printf("dwarf.c:%s() working around bogus -1 DW_AT_byte_size\n",
1055 tdp->t_size = maxsz / 8; /* maxsz is in bits, t_size is bytes */
1059 * GCC will attempt to eliminate unused types, thus decreasing the
1060 * size of the emitted dwarf. That is, if you declare a foo_t in your
1061 * header, include said header in your source file, and neglect to
1062 * actually use (directly or indirectly) the foo_t in the source file,
1063 * the foo_t won't make it into the emitted DWARF. So, at least, goes
1066 * Occasionally, it'll emit the DW_TAG_structure_type for the foo_t,
1067 * and then neglect to emit the members. Strangely, the loner struct
1068 * tag will always be followed by a proper nested declaration of
1069 * something else. This is clearly a bug, but we're not going to have
1070 * time to get it fixed before this goo goes back, so we'll have to work
1071 * around it. If we see a no-membered struct with a nested declaration
1072 * (i.e. die_child of the struct tag won't be null), we'll ignore it.
1073 * Being paranoid, we won't simply remove it from the hash. Instead,
1074 * we'll decline to create an iidesc for it, thus ensuring that this
1075 * type won't make it into the output file. To be safe, we'll also
1078 if (tdp->t_members == NULL) {
1079 const char *old = tdesc_name(tdp);
1080 size_t newsz = 7 + strlen(old) + 1;
1081 char *new = xmalloc(newsz);
1082 (void) snprintf(new, newsz, "orphan %s", old);
1084 debug(3, "die %llu: worked around %s %s\n", off, typename, old);
1086 if (tdp->t_name != NULL)
1093 if (tdp->t_name != NULL) {
1094 ii = xcalloc(sizeof (iidesc_t));
1095 ii->ii_type = II_SOU;
1096 ii->ii_name = xstrdup(tdp->t_name);
1099 iidesc_add(dw->dw_td->td_iihash, ii);
1104 die_struct_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp)
1106 die_sou_create(dw, die, off, tdp, STRUCT, "struct");
1110 die_union_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp)
1112 die_sou_create(dw, die, off, tdp, UNION, "union");
1117 die_sou_resolve(tdesc_t *tdp, tdesc_t **tdpp __unused, void *private)
1119 dwarf_t *dw = private;
1123 if (tdp->t_flags & TDESC_F_RESOLVED)
1126 debug(3, "resolving sou %s\n", tdesc_name(tdp));
1128 for (ml = tdp->t_members; ml != NULL; ml = ml->ml_next) {
1129 if (ml->ml_size == 0) {
1130 mt = tdesc_basetype(ml->ml_type);
1132 if ((ml->ml_size = tdesc_bitsize(mt)) != 0)
1136 * For empty members, or GCC/C99 flexible array
1137 * members, a size of 0 is correct.
1139 if (mt->t_members == NULL)
1141 if (mt->t_type == ARRAY && mt->t_ardef->ad_nelems == 0)
1148 if ((mt = tdesc_basetype(ml->ml_type)) == NULL) {
1153 if (ml->ml_size != 0 && mt->t_type == INTRINSIC &&
1154 mt->t_intr->intr_nbits != (int)ml->ml_size) {
1156 * This member is a bitfield, and needs to reference
1157 * an intrinsic type with the same width. If the
1158 * currently-referenced type isn't of the same width,
1159 * we'll copy it, adjusting the width of the copy to
1160 * the size we'd like.
1162 debug(3, "tdp %u: creating bitfield for %d bits\n",
1163 tdp->t_id, ml->ml_size);
1165 ml->ml_type = tdesc_intr_clone(dw, mt, ml->ml_size);
1169 tdp->t_flags |= TDESC_F_RESOLVED;
1176 die_sou_failed(tdesc_t *tdp, tdesc_t **tdpp __unused, void *private __unused)
1178 const char *typename = (tdp->t_type == STRUCT ? "struct" : "union");
1181 if (tdp->t_flags & TDESC_F_RESOLVED)
1184 for (ml = tdp->t_members; ml != NULL; ml = ml->ml_next) {
1185 if (ml->ml_size == 0) {
1186 fprintf(stderr, "%s %d <%x>: failed to size member \"%s\" "
1187 "of type %s (%d <%x>)\n", typename, tdp->t_id,
1189 ml->ml_name, tdesc_name(ml->ml_type),
1190 ml->ml_type->t_id, ml->ml_type->t_id);
1198 die_funcptr_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp)
1200 Dwarf_Attribute attr;
1206 debug(3, "die %llu <%llx>: creating function pointer\n", off, off);
1209 * We'll begin by processing any type definition nodes that may be
1210 * lurking underneath this one.
1212 for (arg = die_child(dw, die); arg != NULL;
1213 arg = die_sibling(dw, arg)) {
1214 if ((tag = die_tag(dw, arg)) != DW_TAG_formal_parameter &&
1215 tag != DW_TAG_unspecified_parameters) {
1216 /* Nested type declaration */
1217 die_create_one(dw, arg);
1221 if (die_isdecl(dw, die)) {
1223 * This is a prototype. We don't add prototypes to the
1224 * tree, so we're going to drop the tdesc. Unfortunately,
1225 * it has already been added to the tree. Nobody will reference
1226 * it, though, and it will be leaked.
1231 fn = xcalloc(sizeof (fndef_t));
1233 tdp->t_type = FUNCTION;
1235 if ((attr = die_attr(dw, die, DW_AT_type, 0)) != NULL) {
1236 fn->fn_ret = die_lookup_pass1(dw, die, DW_AT_type);
1238 fn->fn_ret = tdesc_intr_void(dw);
1242 * Count the arguments to the function, then read them in.
1244 for (fn->fn_nargs = 0, arg = die_child(dw, die); arg != NULL;
1245 arg = die_sibling(dw, arg)) {
1246 if ((tag = die_tag(dw, arg)) == DW_TAG_formal_parameter)
1248 else if (tag == DW_TAG_unspecified_parameters &&
1253 if (fn->fn_nargs != 0) {
1254 debug(3, "die %llu: adding %d argument%s\n", off, fn->fn_nargs,
1255 (fn->fn_nargs > 1 ? "s" : ""));
1257 fn->fn_args = xcalloc(sizeof (tdesc_t *) * fn->fn_nargs);
1258 for (i = 0, arg = die_child(dw, die);
1259 arg != NULL && i < (int) fn->fn_nargs;
1260 arg = die_sibling(dw, arg)) {
1261 if (die_tag(dw, arg) != DW_TAG_formal_parameter)
1264 fn->fn_args[i++] = die_lookup_pass1(dw, arg,
1270 tdp->t_flags |= TDESC_F_RESOLVED;
1274 * GCC and DevPro use different names for the base types. While the terms are
1275 * the same, they are arranged in a different order. Some terms, such as int,
1276 * are implied in one, and explicitly named in the other. Given a base type
1277 * as input, this routine will return a common name, along with an intr_t
1278 * that reflects said name.
1281 die_base_name_parse(const char *name, char **newp)
1286 int nlong = 0, nshort = 0, nchar = 0, nint = 0;
1291 if (strlen(name) > sizeof (buf) - 1)
1292 terminate("base type name \"%s\" is too long\n", name);
1294 strncpy(buf, name, sizeof (buf));
1296 for (c = strtok(buf, " "); c != NULL; c = strtok(NULL, " ")) {
1297 if (strcmp(c, "signed") == 0)
1299 else if (strcmp(c, "unsigned") == 0)
1301 else if (strcmp(c, "long") == 0)
1303 else if (strcmp(c, "char") == 0) {
1306 } else if (strcmp(c, "short") == 0)
1308 else if (strcmp(c, "int") == 0)
1312 * If we don't recognize any of the tokens, we'll tell
1313 * the caller to fall back to the dwarf-provided
1314 * encoding information.
1320 if (nchar > 1 || nshort > 1 || nint > 1 || nlong > 2)
1324 if (nlong > 0 || nshort > 0 || nint > 0)
1329 } else if (nshort > 0) {
1335 } else if (nlong > 0) {
1342 intr = xcalloc(sizeof (intr_t));
1343 intr->intr_type = INTR_INT;
1344 intr->intr_signed = sign;
1345 intr->intr_iformat = fmt;
1347 snprintf(buf, sizeof (buf), "%s%s%s",
1348 (sign ? "" : "unsigned "),
1349 (nlong > 1 ? "long " : ""),
1352 *newp = xstrdup(buf);
1356 typedef struct fp_size_map {
1357 size_t fsm_typesz[2]; /* size of {32,64} type */
1358 uint_t fsm_enc[3]; /* CTF_FP_* for {bare,cplx,imagry} type */
1361 static const fp_size_map_t fp_encodings[] = {
1362 { { 4, 4 }, { CTF_FP_SINGLE, CTF_FP_CPLX, CTF_FP_IMAGRY } },
1363 { { 8, 8 }, { CTF_FP_DOUBLE, CTF_FP_DCPLX, CTF_FP_DIMAGRY } },
1365 { { 16, 16 }, { CTF_FP_LDOUBLE, CTF_FP_LDCPLX, CTF_FP_LDIMAGRY } },
1367 { { 12, 16 }, { CTF_FP_LDOUBLE, CTF_FP_LDCPLX, CTF_FP_LDIMAGRY } },
1369 { { 0, 0 }, { 0, 0, 0 } }
1373 die_base_type2enc(dwarf_t *dw, Dwarf_Off off, Dwarf_Signed enc, size_t sz)
1375 const fp_size_map_t *map = fp_encodings;
1376 uint_t szidx = dw->dw_ptrsz == sizeof (uint64_t);
1377 uint_t mult = 1, col = 0;
1379 if (enc == DW_ATE_complex_float) {
1382 } else if (enc == DW_ATE_imaginary_float
1384 || enc == DW_ATE_SUN_imaginary_float
1389 while (map->fsm_typesz[szidx] != 0) {
1390 if (map->fsm_typesz[szidx] * mult == sz)
1391 return (map->fsm_enc[col]);
1395 terminate("die %llu: unrecognized real type size %u\n", off, sz);
1401 die_base_from_dwarf(dwarf_t *dw, Dwarf_Die base, Dwarf_Off off, size_t sz)
1403 intr_t *intr = xcalloc(sizeof (intr_t));
1406 (void) die_signed(dw, base, DW_AT_encoding, &enc, DW_ATTR_REQ);
1409 case DW_ATE_unsigned:
1410 case DW_ATE_address:
1411 intr->intr_type = INTR_INT;
1413 case DW_ATE_unsigned_char:
1414 intr->intr_type = INTR_INT;
1415 intr->intr_iformat = 'c';
1418 intr->intr_type = INTR_INT;
1419 intr->intr_signed = 1;
1421 case DW_ATE_signed_char:
1422 intr->intr_type = INTR_INT;
1423 intr->intr_signed = 1;
1424 intr->intr_iformat = 'c';
1426 case DW_ATE_boolean:
1427 intr->intr_type = INTR_INT;
1428 intr->intr_signed = 1;
1429 intr->intr_iformat = 'b';
1432 case DW_ATE_complex_float:
1433 case DW_ATE_imaginary_float:
1435 case DW_ATE_SUN_imaginary_float:
1436 case DW_ATE_SUN_interval_float:
1438 intr->intr_type = INTR_REAL;
1439 intr->intr_signed = 1;
1440 intr->intr_fformat = die_base_type2enc(dw, off, enc, sz);
1443 terminate("die %llu: unknown base type encoding 0x%llx\n",
1451 die_base_create(dwarf_t *dw, Dwarf_Die base, Dwarf_Off off, tdesc_t *tdp)
1457 debug(3, "die %llu: creating base type\n", off);
1460 * The compilers have their own clever (internally inconsistent) ideas
1461 * as to what base types should look like. Some times gcc will, for
1462 * example, use DW_ATE_signed_char for char. Other times, however, it
1463 * will use DW_ATE_signed. Needless to say, this causes some problems
1464 * down the road, particularly with merging. We do, however, use the
1465 * DWARF idea of type sizes, as this allows us to avoid caring about
1468 (void) die_unsigned(dw, base, DW_AT_byte_size, &sz, DW_ATTR_REQ);
1470 /* Check for bogus gcc DW_AT_byte_size attribute */
1471 if (sz == (unsigned)-1) {
1472 printf("dwarf.c:%s() working around bogus -1 DW_AT_byte_size\n",
1477 if (tdp->t_name == NULL)
1478 terminate("die %llu: base type without name\n", off);
1480 /* XXX make a name parser for float too */
1481 if ((intr = die_base_name_parse(tdp->t_name, &new)) != NULL) {
1482 /* Found it. We'll use the parsed version */
1483 debug(3, "die %llu: name \"%s\" remapped to \"%s\"\n", off,
1484 tdesc_name(tdp), new);
1490 * We didn't recognize the type, so we'll create an intr_t
1491 * based on the DWARF data.
1493 debug(3, "die %llu: using dwarf data for base \"%s\"\n", off,
1496 intr = die_base_from_dwarf(dw, base, off, sz);
1499 intr->intr_nbits = sz * 8;
1501 tdp->t_type = INTRINSIC;
1505 tdp->t_flags |= TDESC_F_RESOLVED;
1509 die_through_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp,
1510 int type, const char *typename)
1512 Dwarf_Attribute attr;
1514 debug(3, "die %llu <%llx>: creating %s type %d\n", off, off, typename, type);
1518 if ((attr = die_attr(dw, die, DW_AT_type, 0)) != NULL) {
1519 tdp->t_tdesc = die_lookup_pass1(dw, die, DW_AT_type);
1521 tdp->t_tdesc = tdesc_intr_void(dw);
1524 if (type == POINTER)
1525 tdp->t_size = dw->dw_ptrsz;
1527 tdp->t_flags |= TDESC_F_RESOLVED;
1529 if (type == TYPEDEF) {
1530 iidesc_t *ii = xcalloc(sizeof (iidesc_t));
1531 ii->ii_type = II_TYPE;
1532 ii->ii_name = xstrdup(tdp->t_name);
1535 iidesc_add(dw->dw_td->td_iihash, ii);
1540 die_typedef_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp)
1542 die_through_create(dw, die, off, tdp, TYPEDEF, "typedef");
1546 die_const_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp)
1548 die_through_create(dw, die, off, tdp, CONST, "const");
1552 die_pointer_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp)
1554 die_through_create(dw, die, off, tdp, POINTER, "pointer");
1558 die_restrict_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp)
1560 die_through_create(dw, die, off, tdp, RESTRICT, "restrict");
1564 die_volatile_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp)
1566 die_through_create(dw, die, off, tdp, VOLATILE, "volatile");
1571 die_function_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp __unused)
1578 debug(3, "die %llu <%llx>: creating function definition\n", off, off);
1581 * We'll begin by processing any type definition nodes that may be
1582 * lurking underneath this one.
1584 for (arg = die_child(dw, die); arg != NULL;
1585 arg = die_sibling(dw, arg)) {
1586 if ((tag = die_tag(dw, arg)) != DW_TAG_formal_parameter &&
1587 tag != DW_TAG_variable) {
1588 /* Nested type declaration */
1589 die_create_one(dw, arg);
1593 if (die_isdecl(dw, die) || (name = die_name(dw, die)) == NULL) {
1595 * We process neither prototypes nor subprograms without
1601 ii = xcalloc(sizeof (iidesc_t));
1602 ii->ii_type = die_isglobal(dw, die) ? II_GFUN : II_SFUN;
1604 if (ii->ii_type == II_SFUN)
1605 ii->ii_owner = xstrdup(dw->dw_cuname);
1607 debug(3, "die %llu: function %s is %s\n", off, ii->ii_name,
1608 (ii->ii_type == II_GFUN ? "global" : "static"));
1610 if (die_attr(dw, die, DW_AT_type, 0) != NULL)
1611 ii->ii_dtype = die_lookup_pass1(dw, die, DW_AT_type);
1613 ii->ii_dtype = tdesc_intr_void(dw);
1615 for (arg = die_child(dw, die); arg != NULL;
1616 arg = die_sibling(dw, arg)) {
1619 debug(3, "die %llu: looking at sub member at %llu\n",
1620 off, die_off(dw, die));
1622 if (die_tag(dw, arg) != DW_TAG_formal_parameter)
1625 if ((name1 = die_name(dw, arg)) == NULL) {
1626 terminate("die %llu: func arg %d has no name\n",
1627 off, ii->ii_nargs + 1);
1630 if (strcmp(name1, "...") == 0) {
1639 if (ii->ii_nargs > 0) {
1642 debug(3, "die %llu: function has %d argument%s\n", off,
1643 ii->ii_nargs, (ii->ii_nargs == 1 ? "" : "s"));
1645 ii->ii_args = xcalloc(sizeof (tdesc_t) * ii->ii_nargs);
1647 for (arg = die_child(dw, die), i = 0;
1648 arg != NULL && i < ii->ii_nargs;
1649 arg = die_sibling(dw, arg)) {
1650 if (die_tag(dw, arg) != DW_TAG_formal_parameter)
1653 ii->ii_args[i++] = die_lookup_pass1(dw, arg,
1658 iidesc_add(dw->dw_td->td_iihash, ii);
1663 die_variable_create(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off, tdesc_t *tdp __unused)
1668 debug(3, "die %llu: creating object definition\n", off);
1670 if (die_isdecl(dw, die) || (name = die_name(dw, die)) == NULL)
1671 return; /* skip prototypes and nameless objects */
1673 ii = xcalloc(sizeof (iidesc_t));
1674 ii->ii_type = die_isglobal(dw, die) ? II_GVAR : II_SVAR;
1676 ii->ii_dtype = die_lookup_pass1(dw, die, DW_AT_type);
1677 if (ii->ii_type == II_SVAR)
1678 ii->ii_owner = xstrdup(dw->dw_cuname);
1680 iidesc_add(dw->dw_td->td_iihash, ii);
1685 die_fwd_resolve(tdesc_t *fwd, tdesc_t **fwdp, void *private __unused)
1687 if (fwd->t_flags & TDESC_F_RESOLVED)
1690 if (fwd->t_tdesc != NULL) {
1691 debug(3, "tdp %u: unforwarded %s\n", fwd->t_id,
1693 *fwdp = fwd->t_tdesc;
1696 fwd->t_flags |= TDESC_F_RESOLVED;
1703 die_lexblk_descend(dwarf_t *dw, Dwarf_Die die, Dwarf_Off off __unused, tdesc_t *tdp __unused)
1705 Dwarf_Die child = die_child(dw, die);
1708 die_create(dw, child);
1712 * Used to map the die to a routine which can parse it, using the tag to do the
1713 * mapping. While the processing of most tags entails the creation of a tdesc,
1714 * there are a few which don't - primarily those which result in the creation of
1715 * iidescs which refer to existing tdescs.
1718 #define DW_F_NOTDP 0x1 /* Don't create a tdesc for the creator */
1720 typedef struct die_creator {
1723 void (*dc_create)(dwarf_t *, Dwarf_Die, Dwarf_Off, tdesc_t *);
1726 static const die_creator_t die_creators[] = {
1727 { DW_TAG_array_type, 0, die_array_create },
1728 { DW_TAG_enumeration_type, 0, die_enum_create },
1729 { DW_TAG_lexical_block, DW_F_NOTDP, die_lexblk_descend },
1730 { DW_TAG_pointer_type, 0, die_pointer_create },
1731 { DW_TAG_structure_type, 0, die_struct_create },
1732 { DW_TAG_subroutine_type, 0, die_funcptr_create },
1733 { DW_TAG_typedef, 0, die_typedef_create },
1734 { DW_TAG_union_type, 0, die_union_create },
1735 { DW_TAG_base_type, 0, die_base_create },
1736 { DW_TAG_const_type, 0, die_const_create },
1737 { DW_TAG_subprogram, DW_F_NOTDP, die_function_create },
1738 { DW_TAG_variable, DW_F_NOTDP, die_variable_create },
1739 { DW_TAG_volatile_type, 0, die_volatile_create },
1740 { DW_TAG_restrict_type, 0, die_restrict_create },
1744 static const die_creator_t *
1745 die_tag2ctor(Dwarf_Half tag)
1747 const die_creator_t *dc;
1749 for (dc = die_creators; dc->dc_create != NULL; dc++) {
1750 if (dc->dc_tag == tag)
1758 die_create_one(dwarf_t *dw, Dwarf_Die die)
1760 Dwarf_Off off = die_off(dw, die);
1761 const die_creator_t *dc;
1765 debug(3, "die %llu <%llx>: create_one\n", off, off);
1767 if (off > dw->dw_maxoff) {
1768 terminate("illegal die offset %llu (max %llu)\n", off,
1772 tag = die_tag(dw, die);
1774 if ((dc = die_tag2ctor(tag)) == NULL) {
1775 debug(2, "die %llu: ignoring tag type %x\n", off, tag);
1779 if ((tdp = tdesc_lookup(dw, off)) == NULL &&
1780 !(dc->dc_flags & DW_F_NOTDP)) {
1781 tdp = xcalloc(sizeof (tdesc_t));
1787 tdp->t_name = die_name(dw, die);
1789 dc->dc_create(dw, die, off, tdp);
1793 die_create(dwarf_t *dw, Dwarf_Die die)
1796 die_create_one(dw, die);
1797 } while ((die = die_sibling(dw, die)) != NULL);
1800 static tdtrav_cb_f die_resolvers[] = {
1802 NULL, /* intrinsic */
1804 die_array_resolve, /* array */
1805 NULL, /* function */
1806 die_sou_resolve, /* struct */
1807 die_sou_resolve, /* union */
1808 die_enum_resolve, /* enum */
1809 die_fwd_resolve, /* forward */
1811 NULL, /* typedef unres */
1812 NULL, /* volatile */
1814 NULL, /* restrict */
1817 static tdtrav_cb_f die_fail_reporters[] = {
1819 NULL, /* intrinsic */
1821 die_array_failed, /* array */
1822 NULL, /* function */
1823 die_sou_failed, /* struct */
1824 die_sou_failed, /* union */
1828 NULL, /* typedef unres */
1829 NULL, /* volatile */
1831 NULL, /* restrict */
1835 die_resolve(dwarf_t *dw)
1844 (void) iitraverse_hash(dw->dw_td->td_iihash,
1845 &dw->dw_td->td_curvgen, NULL, NULL, die_resolvers, dw);
1847 debug(3, "resolve: pass %d, %u left\n", pass, dw->dw_nunres);
1849 if ((int) dw->dw_nunres == last) {
1850 fprintf(stderr, "%s: failed to resolve the following "
1851 "types:\n", progname);
1853 (void) iitraverse_hash(dw->dw_td->td_iihash,
1854 &dw->dw_td->td_curvgen, NULL, NULL,
1855 die_fail_reporters, dw);
1857 terminate("failed to resolve types\n");
1860 last = dw->dw_nunres;
1862 } while (dw->dw_nunres != 0);
1866 * Any object containing a function or object symbol at any scope should also
1867 * contain DWARF data.
1870 should_have_dwarf(Elf *elf)
1872 Elf_Scn *scn = NULL;
1873 Elf_Data *data = NULL;
1878 boolean_t found = B_FALSE;
1880 while ((scn = elf_nextscn(elf, scn)) != NULL) {
1881 gelf_getshdr(scn, &shdr);
1883 if (shdr.sh_type == SHT_SYMTAB) {
1890 terminate("cannot convert stripped objects\n");
1892 data = elf_getdata(scn, NULL);
1893 nsyms = shdr.sh_size / shdr.sh_entsize;
1895 for (symdx = 0; symdx < nsyms; symdx++) {
1896 gelf_getsym(data, symdx, &sym);
1898 if ((GELF_ST_TYPE(sym.st_info) == STT_FUNC) ||
1899 (GELF_ST_TYPE(sym.st_info) == STT_TLS) ||
1900 (GELF_ST_TYPE(sym.st_info) == STT_OBJECT)) {
1903 name = elf_strptr(elf, shdr.sh_link, sym.st_name);
1905 /* Studio emits these local symbols regardless */
1906 if ((strcmp(name, "Bbss.bss") != 0) &&
1907 (strcmp(name, "Ttbss.bss") != 0) &&
1908 (strcmp(name, "Ddata.data") != 0) &&
1909 (strcmp(name, "Ttdata.data") != 0) &&
1910 (strcmp(name, "Drodata.rodata") != 0))
1920 dw_read(tdata_t *td, Elf *elf, char *filename __unused)
1922 Dwarf_Unsigned abboff, hdrlen, nxthdr;
1923 Dwarf_Half vers, addrsz;
1925 Dwarf_Die child = 0;
1930 bzero(&dw, sizeof (dwarf_t));
1932 dw.dw_ptrsz = elf_ptrsz(elf);
1933 dw.dw_mfgtid_last = TID_MFGTID_BASE;
1934 dw.dw_tidhash = hash_new(TDESC_HASH_BUCKETS, tdesc_idhash, tdesc_idcmp);
1935 dw.dw_fwdhash = hash_new(TDESC_HASH_BUCKETS, tdesc_namehash,
1937 dw.dw_enumhash = hash_new(TDESC_HASH_BUCKETS, tdesc_namehash,
1940 if ((rc = dwarf_elf_init(elf, DW_DLC_READ, &dw.dw_dw,
1941 &dw.dw_err)) == DW_DLV_NO_ENTRY) {
1942 if (should_have_dwarf(elf)) {
1948 } else if (rc != DW_DLV_OK) {
1949 if (dwarf_errno(&dw.dw_err) == DW_DLE_DEBUG_INFO_NULL) {
1951 * There's no type data in the DWARF section, but
1952 * libdwarf is too clever to handle that properly.
1957 terminate("failed to initialize DWARF: %s\n",
1958 dwarf_errmsg(&dw.dw_err));
1961 if ((rc = dwarf_next_cu_header(dw.dw_dw, &hdrlen, &vers, &abboff,
1962 &addrsz, &nxthdr, &dw.dw_err)) != DW_DLV_OK)
1963 terminate("rc = %d %s\n", rc, dwarf_errmsg(&dw.dw_err));
1965 if ((cu = die_sibling(&dw, NULL)) == NULL ||
1966 (((child = die_child(&dw, cu)) == NULL) &&
1967 should_have_dwarf(elf))) {
1968 terminate("file does not contain dwarf type data "
1969 "(try compiling with -g)\n");
1970 } else if (child == NULL) {
1974 dw.dw_maxoff = nxthdr - 1;
1976 if (dw.dw_maxoff > TID_FILEMAX)
1977 terminate("file contains too many types\n");
1979 debug(1, "DWARF version: %d\n", vers);
1980 if (vers != DWARF_VERSION) {
1981 terminate("file contains incompatible version %d DWARF code "
1982 "(version 2 required)\n", vers);
1985 if (die_string(&dw, cu, DW_AT_producer, &prod, 0)) {
1986 debug(1, "DWARF emitter: %s\n", prod);
1990 if ((dw.dw_cuname = die_name(&dw, cu)) != NULL) {
1991 char *base = xstrdup(basename(dw.dw_cuname));
1993 dw.dw_cuname = base;
1995 debug(1, "CU name: %s\n", dw.dw_cuname);
1998 if ((child = die_child(&dw, cu)) != NULL)
1999 die_create(&dw, child);
2001 if ((rc = dwarf_next_cu_header(dw.dw_dw, &hdrlen, &vers, &abboff,
2002 &addrsz, &nxthdr, &dw.dw_err)) != DW_DLV_NO_ENTRY)
2003 terminate("multiple compilation units not supported\n");
2005 (void) dwarf_finish(&dw.dw_dw, &dw.dw_err);
2009 cvt_fixups(td, dw.dw_ptrsz);
2011 /* leak the dwarf_t */