dump.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/stat.h>
#include <sys/mman.h>

#include <err.h>
#include <strings.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <gelf.h>
#include <zlib.h>

#include "ctf_headers.h"
#include "utils.h"
#include "symbol.h"

#define	WARN(x)	{ warn(x); return (E_ERROR); }

/*
 * Flags that indicate what data is to be displayed.  An explicit `all' value is
 * provided to allow the code to distinguish between a request for everything
 * (currently requested by invoking ctfdump without flags) and individual
 * requests for all of the types of data (an invocation with all flags).  In the
 * former case, we want to be able to implicitly adjust the definition of `all'
 * based on the CTF version of the file being dumped.  For example, if a v2 file
 * is being dumped, `all' includes F_LABEL - a request to dump the label
 * section.  If a v1 file is being dumped, `all' does not include F_LABEL,
 * because v1 CTF doesn't support labels.  We need to be able to distinguish
 * between `ctfdump foo', which has an implicit request for labels if `foo'
 * supports them, and `ctfdump -l foo', which has an explicity request.  In the
 * latter case, we exit with an error if `foo' is a v1 CTF file.
 */
static enum {
	F_DATA	= 0x01,		/* show data object section */
	F_FUNC	= 0x02,		/* show function section */
	F_HDR	= 0x04,		/* show header */
	F_STR	= 0x08,		/* show string table */
	F_TYPES	= 0x10,		/* show type section */
	F_STATS = 0x20, 	/* show statistics */
	F_LABEL	= 0x40,		/* show label section */
	F_ALL	= 0x80,		/* explicit request for `all' */
	F_ALLMSK = 0xff		/* show all sections and statistics */
} flags = 0;

static struct {
	ulong_t s_ndata;	/* total number of data objects */
	ulong_t s_nfunc;	/* total number of functions */
	ulong_t s_nargs;	/* total number of function arguments */
	ulong_t s_argmax;	/* longest argument list */
	ulong_t s_ntypes;	/* total number of types */
	ulong_t s_types[16];	/* number of types by kind */
	ulong_t s_nsmem;	/* total number of struct members */
	ulong_t s_nsbytes;	/* total size of all structs */
	ulong_t s_smmax;	/* largest struct in terms of members */
	ulong_t s_sbmax;	/* largest struct in terms of bytes */
	ulong_t s_numem;	/* total number of union members */
	ulong_t s_nubytes;	/* total size of all unions */
	ulong_t s_ummax;	/* largest union in terms of members */
	ulong_t s_ubmax;	/* largest union in terms of bytes */
	ulong_t s_nemem;	/* total number of enum members */
	ulong_t s_emmax;	/* largest enum in terms of members */
	ulong_t s_nstr;		/* total number of strings */
	size_t s_strlen;	/* total length of all strings */
	size_t s_strmax;	/* longest string length */
} stats;

typedef struct ctf_data {
	caddr_t cd_ctfdata;	/* Pointer to the CTF data */
	size_t cd_ctflen;	/* Length of CTF data */

	size_t cd_idwidth;	/* Size of a type ID, in bytes */

	/*
	 * cd_symdata will be non-NULL if the CTF data is being retrieved from
	 * an ELF file with a symbol table.  cd_strdata and cd_nsyms should be
	 * used only if cd_symdata is non-NULL.
	 */
	Elf_Data *cd_symdata;	/* Symbol table */
	Elf_Data *cd_strdata;	/* Symbol table strings */
	int cd_nsyms;		/* Number of symbol table entries */
} ctf_data_t;

static const char *
ref_to_str(uint_t name, const ctf_header_t *hp, const ctf_data_t *cd)
{
	size_t offset = CTF_NAME_OFFSET(name);
	const char *s = cd->cd_ctfdata + hp->cth_stroff + offset;

	if (CTF_NAME_STID(name) != CTF_STRTAB_0)
		return ("<< ??? - name in external strtab >>");

	if (offset >= hp->cth_strlen)
		return ("<< ??? - name exceeds strlab len >>");

	if (hp->cth_stroff + offset >= cd->cd_ctflen)
		return ("<< ??? - file truncated >>");

	if (s[0] == '\0')
		return ("(anon)");

	return (s);
}

static const char *
int_encoding_to_str(uint_t encoding)
{
	static char buf[32];

	if (encoding == 0 || (encoding & ~(CTF_INT_SIGNED | CTF_INT_CHAR |
	    CTF_INT_BOOL | CTF_INT_VARARGS)) != 0)
		(void) snprintf(buf, sizeof (buf), " 0x%x", encoding);
	else {
		buf[0] = '\0';
		if (encoding & CTF_INT_SIGNED)
			(void) strcat(buf, " SIGNED");
		if (encoding & CTF_INT_CHAR)
			(void) strcat(buf, " CHAR");
		if (encoding & CTF_INT_BOOL)
			(void) strcat(buf, " BOOL");
		if (encoding & CTF_INT_VARARGS)
			(void) strcat(buf, " VARARGS");
	}

	return (buf + 1);
}

static const char *
fp_encoding_to_str(uint_t encoding)
{
	static const char *const encs[] = {
		NULL, "SINGLE", "DOUBLE", "COMPLEX", "DCOMPLEX", "LDCOMPLEX",
		"LDOUBLE", "INTERVAL", "DINTERVAL", "LDINTERVAL", "IMAGINARY",
		"DIMAGINARY", "LDIMAGINARY"
	};

	static char buf[16];

	if (encoding < 1 || encoding >= (sizeof (encs) / sizeof (char *))) {
		(void) snprintf(buf, sizeof (buf), "%u", encoding);
		return (buf);
	}

	return (encs[encoding]);
}

static void
print_line(const char *s)
{
	static const char line[] = "----------------------------------------"
	    "----------------------------------------";
	(void) printf("\n%s%.*s\n\n", s, (int)(78 - strlen(s)), line);
}

static int
print_header(const ctf_header_t *hp, const ctf_data_t *cd)
{
	print_line("- CTF Header ");

	(void) printf("  cth_magic    = 0x%04x\n", hp->cth_magic);
	(void) printf("  cth_version  = %u\n", hp->cth_version);
	(void) printf("  cth_flags    = 0x%02x\n", hp->cth_flags);
	(void) printf("  cth_parlabel = %s\n",
	    ref_to_str(hp->cth_parlabel, hp, cd));
	(void) printf("  cth_parname  = %s\n",
	    ref_to_str(hp->cth_parname, hp, cd));
	(void) printf("  cth_lbloff   = %u\n", hp->cth_lbloff);
	(void) printf("  cth_objtoff  = %u\n", hp->cth_objtoff);
	(void) printf("  cth_funcoff  = %u\n", hp->cth_funcoff);
	(void) printf("  cth_typeoff  = %u\n", hp->cth_typeoff);
	(void) printf("  cth_stroff   = %u\n", hp->cth_stroff);
	(void) printf("  cth_strlen   = %u\n", hp->cth_strlen);

	return (E_SUCCESS);
}

static int
print_labeltable(const ctf_header_t *hp, const ctf_data_t *cd)
{
	void *v = (void *) (cd->cd_ctfdata + hp->cth_lbloff);
	const ctf_lblent_t *ctl = v;
	ulong_t i, n = (hp->cth_objtoff - hp->cth_lbloff) / sizeof (*ctl);

	print_line("- Label Table ");

	if (hp->cth_lbloff & 3)
		WARN("cth_lbloff is not aligned properly\n");
	if (hp->cth_lbloff >= cd->cd_ctflen)
		WARN("file is truncated or cth_lbloff is corrupt\n");
	if (hp->cth_objtoff >= cd->cd_ctflen)
		WARN("file is truncated or cth_objtoff is corrupt\n");
	if (hp->cth_lbloff > hp->cth_objtoff)
		WARN("file is corrupt -- cth_lbloff > cth_objtoff\n");

	for (i = 0; i < n; i++, ctl++) {
		(void) printf("  %5u %s\n", ctl->ctl_typeidx,
		    ref_to_str(ctl->ctl_label, hp, cd));
	}

	return (E_SUCCESS);
}

/*
 * Given the current symbol index (-1 to start at the beginning of the symbol
 * table) and the type of symbol to match, this function returns the index of
 * the next matching symbol (if any), and places the name of that symbol in
 * *namep.  If no symbol is found, -1 is returned.
 */
static int
next_sym(const ctf_data_t *cd, const int symidx, const uchar_t matchtype,
    char **namep)
{
	int i;

	for (i = symidx + 1; i < cd->cd_nsyms; i++) {
		GElf_Sym sym;
		char *name;
		int type;

		if (gelf_getsym(cd->cd_symdata, i, &sym) == 0)
			return (-1);

		name = (char *)cd->cd_strdata->d_buf + sym.st_name;
		type = GELF_ST_TYPE(sym.st_info);

		/*
		 * Skip various types of symbol table entries.
		 */
		if (type != matchtype || ignore_symbol(&sym, name))
			continue;

		/* Found one */
		*namep = name;
		return (i);
	}

	return (-1);
}

static int
read_data(const ctf_header_t *hp, const ctf_data_t *cd)
{
	const char *v = (void *) (cd->cd_ctfdata + hp->cth_objtoff);
	ulong_t n = (hp->cth_funcoff - hp->cth_objtoff) / cd->cd_idwidth;

	if (flags != F_STATS)
		print_line("- Data Objects ");

	if (hp->cth_objtoff & 1)
		WARN("cth_objtoff is not aligned properly\n");
	if (hp->cth_objtoff >= cd->cd_ctflen)
		WARN("file is truncated or cth_objtoff is corrupt\n");
	if (hp->cth_funcoff >= cd->cd_ctflen)
		WARN("file is truncated or cth_funcoff is corrupt\n");
	if (hp->cth_objtoff > hp->cth_funcoff)
		WARN("file is corrupt -- cth_objtoff > cth_funcoff\n");

	if (flags != F_STATS) {
		int symidx, len, i;
		char *name = NULL;

		for (symidx = -1, i = 0; i < (int) n; i++) {
			uint32_t id = 0;
			int nextsym;

			if (cd->cd_symdata == NULL || (nextsym = next_sym(cd,
			    symidx, STT_OBJECT, &name)) < 0)
				name = NULL;
			else
				symidx = nextsym;

			memcpy(&id, v, cd->cd_idwidth);
			v += cd->cd_idwidth;
			len = printf("  [%u] %u", i, id);
			if (name != NULL)
				(void) printf("%*s%s (%u)", (15 - len), "",
				    name, symidx);
			(void) putchar('\n');
		}
	}

	stats.s_ndata = n;
	return (E_SUCCESS);
}

static int
read_funcs(const ctf_header_t *hp, const ctf_data_t *cd)
{
	const char *v = (void *) (cd->cd_ctfdata + hp->cth_funcoff);
	uint_t f = 0, info;

	const char *end = (void *) (cd->cd_ctfdata + hp->cth_typeoff);

	ulong_t id;
	int symidx;

	if (flags != F_STATS)
		print_line("- Functions ");

	if (hp->cth_funcoff & 1)
		WARN("cth_funcoff is not aligned properly\n");
	if (hp->cth_funcoff >= cd->cd_ctflen)
		WARN("file is truncated or cth_funcoff is corrupt\n");
	if (hp->cth_typeoff >= cd->cd_ctflen)
		WARN("file is truncated or cth_typeoff is corrupt\n");
	if (hp->cth_funcoff > hp->cth_typeoff)
		WARN("file is corrupt -- cth_funcoff > cth_typeoff\n");

	for (symidx = -1, id = 0; v < end; id++) {
		info = 0;
		memcpy(&info, v, cd->cd_idwidth);
		v += cd->cd_idwidth;
		ushort_t kind = hp->cth_version == CTF_VERSION_2 ?
		    CTF_V2_INFO_KIND(info) : CTF_V3_INFO_KIND(info);
		ushort_t n = hp->cth_version == CTF_VERSION_2 ?
		    CTF_V2_INFO_VLEN(info) : CTF_V3_INFO_VLEN(info);
		ushort_t i;
		int nextsym;
		char *name;

		if (cd->cd_symdata == NULL || (nextsym = next_sym(cd, symidx,
		    STT_FUNC, &name)) < 0)
			name = NULL;
		else
			symidx = nextsym;

		if (kind == CTF_K_UNKNOWN && n == 0)
			continue; /* skip padding */

		if (kind != CTF_K_FUNCTION) {
			(void) printf("  [%lu] unexpected kind -- %u\n",
			    id, kind);
			return (E_ERROR);
		}

		if (v + n * cd->cd_idwidth > end) {
			(void) printf("  [%lu] vlen %u extends past section "
			    "boundary\n", id, n);
			return (E_ERROR);
		}

		if (flags != F_STATS) {
			(void) printf("  [%lu] FUNC ", id);
			if (name != NULL)
				(void) printf("(%s) ", name);
			memcpy(&f, v, cd->cd_idwidth);
			v += cd->cd_idwidth;
			(void) printf("returns: %u args: (", f);

			if (n != 0) {
				memcpy(&f, v, cd->cd_idwidth);
				v += cd->cd_idwidth;
				(void) printf("%u", f);
				for (i = 1; i < n; i++) {
					memcpy(&f, v, cd->cd_idwidth);
					v += cd->cd_idwidth;
					(void) printf(", %u", f);
				}
			}

			(void) printf(")\n");
		} else
			v += n * cd->cd_idwidth + 1; /* skip to next function definition */

		stats.s_nfunc++;
		stats.s_nargs += n;
		stats.s_argmax = MAX(stats.s_argmax, n);
	}

	return (E_SUCCESS);
}

static int
read_types(const ctf_header_t *hp, const ctf_data_t *cd)
{
	const char *v = (void *) (cd->cd_ctfdata + hp->cth_typeoff);
	const char *end = (void *) (cd->cd_ctfdata + hp->cth_stroff);
	ulong_t id;
	uint_t version;

	if (flags != F_STATS)
		print_line("- Types ");

	if (hp->cth_typeoff & 3)
		WARN("cth_typeoff is not aligned properly\n");
	if (hp->cth_typeoff >= cd->cd_ctflen)
		WARN("file is truncated or cth_typeoff is corrupt\n");
	if (hp->cth_stroff >= cd->cd_ctflen)
		WARN("file is truncated or cth_stroff is corrupt\n");
	if (hp->cth_typeoff > hp->cth_stroff)
		WARN("file is corrupt -- cth_typeoff > cth_stroff\n");

	version = hp->cth_version;

	id = 1;
	if (hp->cth_parlabel || hp->cth_parname)
		id += 1ul << (hp->cth_version == CTF_VERSION_2 ?
		    CTF_V2_PARENT_SHIFT : CTF_V3_PARENT_SHIFT);

	for (/* */; v < end; id++) {
		struct ctf_type_v2 t2;
		struct ctf_type_v3 t3;
		ulong_t i, n;
		size_t size, increment, vlen = 0;
		uint_t isroot, name, type;
		int kind;

		if (version == CTF_VERSION_2) {
			memcpy(&t2, v, sizeof(t2));
			name = t2.ctt_name;
			n = CTF_V2_INFO_VLEN(t2.ctt_info);
			isroot = CTF_V2_INFO_ISROOT(t2.ctt_info);
			kind = CTF_V2_INFO_KIND(t2.ctt_info);
			type = t2.ctt_type;

			if (t2.ctt_size == CTF_V2_LSIZE_SENT) {
				increment = sizeof (struct ctf_type_v2);
				size = (size_t)CTF_TYPE_LSIZE(&t2);
			} else {
				increment = sizeof (struct ctf_stype_v2);
				size = t2.ctt_size;
			}
		} else {
			memcpy(&t3, v, sizeof(t3));
			name = t3.ctt_name;
			n = CTF_V3_INFO_VLEN(t3.ctt_info);
			isroot = CTF_V3_INFO_ISROOT(t3.ctt_info);
			kind = CTF_V3_INFO_KIND(t3.ctt_info);
			type = t3.ctt_type;

			if (t3.ctt_size == CTF_V3_LSIZE_SENT) {
				increment = sizeof (struct ctf_type_v3);
				size = (size_t)CTF_TYPE_LSIZE(&t3);
			} else {
				increment = sizeof (struct ctf_stype_v3);
				size = t3.ctt_size;
			}
		}

		union {
			const char *ptr;
			struct ctf_array_v2 *ap2;
			struct ctf_array_v3 *ap3;
			const struct ctf_member_v2 *mp2;
			const struct ctf_member_v3 *mp3;
			const struct ctf_lmember_v2 *lmp2;
			const struct ctf_lmember_v3 *lmp3;
			const ctf_enum_t *ep;
		} u;

		u.ptr = v + increment;

		if (flags != F_STATS) {
			(void) printf("  %c%lu%c ",
			    "[<"[isroot], id, "]>"[isroot]);
		}

		switch (kind) {
		case CTF_K_INTEGER:
			if (flags != F_STATS) {
				uint_t encoding =
				    *((const uint_t *)(const void *)u.ptr);

				(void) printf("INTEGER %s encoding=%s offset=%u"
				    " bits=%u", ref_to_str(name, hp, cd),
				    int_encoding_to_str(
				    CTF_INT_ENCODING(encoding)),
				    CTF_INT_OFFSET(encoding),
				    CTF_INT_BITS(encoding));
			}
			vlen = sizeof (uint32_t);
			break;

		case CTF_K_FLOAT:
			if (flags != F_STATS) {
				uint_t encoding =
				    *((const uint_t *)(const void *)u.ptr);

				(void) printf("FLOAT %s encoding=%s offset=%u "
				    "bits=%u", ref_to_str(name, hp, cd),
				    fp_encoding_to_str(
				    CTF_FP_ENCODING(encoding)),
				    CTF_FP_OFFSET(encoding),
				    CTF_FP_BITS(encoding));
			}
			vlen = sizeof (uint32_t);
			break;

		case CTF_K_POINTER:
			if (flags != F_STATS) {
				(void) printf("POINTER %s refers to %u",
				    ref_to_str(name, hp, cd), type);
			}
			break;

		case CTF_K_ARRAY: {
			uint_t contents, index, nelems;

			if (version == CTF_VERSION_2) {
				contents = u.ap2->cta_contents;
				index = u.ap2->cta_index;
				nelems = u.ap2->cta_nelems;
			} else {
				contents = u.ap3->cta_contents;
				index = u.ap3->cta_index;
				nelems = u.ap3->cta_nelems;
			}
			if (flags != F_STATS) {
				(void) printf("ARRAY %s content: %u index: %u "
				    "nelems: %u\n", ref_to_str(name, hp, cd),
				    contents, index, nelems);
			}
			if (version == 2)
				vlen = sizeof (struct ctf_array_v2);
			else
				vlen = sizeof (struct ctf_array_v3);
			break;
		}

		case CTF_K_FUNCTION: {
			uint_t arg = 0;

			if (flags != F_STATS) {
				(void) printf("FUNCTION %s returns: %u args: (",
				    ref_to_str(name, hp, cd), type);

				if (n != 0) {
					memcpy(&arg, u.ptr, cd->cd_idwidth);
					u.ptr += cd->cd_idwidth;
					(void) printf("%u", arg);
					for (i = 1; i < n;
					    i++, u.ptr += cd->cd_idwidth) {
						memcpy(&arg, u.ptr,
						    cd->cd_idwidth);
						(void) printf(", %u", arg);
					}
				}

				(void) printf(")");
			}

			vlen = roundup2(cd->cd_idwidth * n, 4);
			break;
		}

		case CTF_K_STRUCT:
		case CTF_K_UNION:
			if (kind == CTF_K_STRUCT) {
				stats.s_nsmem += n;
				stats.s_smmax = MAX(stats.s_smmax, n);
				stats.s_nsbytes += size;
				stats.s_sbmax = MAX(stats.s_sbmax, size);

				if (flags != F_STATS)
					(void) printf("STRUCT");
			} else {
				stats.s_numem += n;
				stats.s_ummax = MAX(stats.s_ummax, n);
				stats.s_nubytes += size;
				stats.s_ubmax = MAX(stats.s_ubmax, size);

				if (flags != F_STATS)
					(void) printf("UNION");
			}

			if (flags != F_STATS) {
				(void) printf(" %s (%zd bytes)\n",
				    ref_to_str(name, hp, cd), size);

				if (version == CTF_VERSION_2) {
					if (size >= CTF_V2_LSTRUCT_THRESH) {
						for (i = 0; i < n; i++, u.lmp2++) {
							(void) printf(
							    "\t%s type=%u off=%llu\n",
							    ref_to_str(u.lmp2->ctlm_name,
							    hp, cd), u.lmp2->ctlm_type,
							    (unsigned long long)
							    CTF_LMEM_OFFSET(u.lmp2));
						}
					} else {
						for (i = 0; i < n; i++, u.mp2++) {
							(void) printf(
							    "\t%s type=%u off=%u\n",
							    ref_to_str(u.mp2->ctm_name,
							    hp, cd), u.mp2->ctm_type,
							    u.mp2->ctm_offset);
						}
					}
				} else {
					if (size >= CTF_V3_LSTRUCT_THRESH) {
						for (i = 0; i < n; i++, u.lmp3++) {
							(void) printf(
							    "\t%s type=%u off=%llu\n",
							    ref_to_str(u.lmp3->ctlm_name,
							    hp, cd), u.lmp3->ctlm_type,
							    (unsigned long long)
							    CTF_LMEM_OFFSET(u.lmp3));
						}
					} else {
						for (i = 0; i < n; i++, u.mp3++) {
							(void) printf(
							    "\t%s type=%u off=%u\n",
							    ref_to_str(u.mp3->ctm_name,
							    hp, cd), u.mp3->ctm_type,
							    u.mp3->ctm_offset);
						}
					}
				}
			}

			if (version == CTF_VERSION_2) {
				vlen = n * (size >= CTF_V2_LSTRUCT_THRESH ?
				    sizeof (struct ctf_lmember_v2) :
				    sizeof (struct ctf_member_v2));
			} else {
				vlen = n * (size >= CTF_V3_LSTRUCT_THRESH ?
				    sizeof (struct ctf_lmember_v3) :
				    sizeof (struct ctf_member_v3));
			}
			break;

		case CTF_K_ENUM:
			if (flags != F_STATS) {
				(void) printf("ENUM %s\n",
				    ref_to_str(name, hp, cd));

				for (i = 0; i < n; i++, u.ep++) {
					(void) printf("\t%s = %d\n",
					    ref_to_str(u.ep->cte_name, hp, cd),
					    u.ep->cte_value);
				}
			}

			stats.s_nemem += n;
			stats.s_emmax = MAX(stats.s_emmax, n);

			vlen = sizeof (ctf_enum_t) * n;
			break;

		case CTF_K_FORWARD:
			if (flags != F_STATS) {
				(void) printf("FORWARD %s",
				    ref_to_str(name, hp, cd));
			}
			break;

		case CTF_K_TYPEDEF:
			if (flags != F_STATS) {
				(void) printf("TYPEDEF %s refers to %u",
				    ref_to_str(name, hp, cd), type);
			}
			break;

		case CTF_K_VOLATILE:
			if (flags != F_STATS) {
				(void) printf("VOLATILE %s refers to %u",
				    ref_to_str(name, hp, cd), type);
			}
			break;

		case CTF_K_CONST:
			if (flags != F_STATS) {
				(void) printf("CONST %s refers to %u",
				    ref_to_str(name, hp, cd), type);
			}
			break;

		case CTF_K_RESTRICT:
			if (flags != F_STATS) {
				(void) printf("RESTRICT %s refers to %u",
				    ref_to_str(name, hp, cd), type);
			}
			break;

		case CTF_K_UNKNOWN:
			break; /* hole in type id space */

		default:
			(void) printf("unexpected kind %u\n", kind);
			return (E_ERROR);
		}

		if (flags != F_STATS)
			(void) printf("\n");

		stats.s_ntypes++;
		stats.s_types[kind]++;

		v += increment + vlen;
	}

	return (E_SUCCESS);
}

static int
read_strtab(const ctf_header_t *hp, const ctf_data_t *cd)
{
	size_t n, off, len = hp->cth_strlen;
	const char *s = cd->cd_ctfdata + hp->cth_stroff;

	if (flags != F_STATS)
		print_line("- String Table ");

	if (hp->cth_stroff >= cd->cd_ctflen)
		WARN("file is truncated or cth_stroff is corrupt\n");
	if (hp->cth_stroff + hp->cth_strlen > cd->cd_ctflen)
		WARN("file is truncated or cth_strlen is corrupt\n");

	for (off = 0; len != 0; off += n) {
		if (flags != F_STATS) {
			(void) printf("  [%lu] %s\n", (ulong_t)off,
			    s[0] == '\0' ? "\\0" : s);
		}
		n = strlen(s) + 1;
		len -= n;
		s += n;

		stats.s_nstr++;
		stats.s_strlen += n;
		stats.s_strmax = MAX(stats.s_strmax, n);
	}

	return (E_SUCCESS);
}

static void
long_stat(const char *name, ulong_t value)
{
	(void) printf("  %-36s= %lu\n", name, value);
}

static void
fp_stat(const char *name, float value)
{
	(void) printf("  %-36s= %.2f\n", name, value);
}

static int
print_stats(void)
{
	print_line("- CTF Statistics ");

	long_stat("total number of data objects", stats.s_ndata);
	(void) printf("\n");

	long_stat("total number of functions", stats.s_nfunc);
	long_stat("total number of function arguments", stats.s_nargs);
	long_stat("maximum argument list length", stats.s_argmax);

	if (stats.s_nfunc != 0) {
		fp_stat("average argument list length",
		    (float)stats.s_nargs / (float)stats.s_nfunc);
	}

	(void) printf("\n");

	long_stat("total number of types", stats.s_ntypes);
	long_stat("total number of integers", stats.s_types[CTF_K_INTEGER]);
	long_stat("total number of floats", stats.s_types[CTF_K_FLOAT]);
	long_stat("total number of pointers", stats.s_types[CTF_K_POINTER]);
	long_stat("total number of arrays", stats.s_types[CTF_K_ARRAY]);
	long_stat("total number of func types", stats.s_types[CTF_K_FUNCTION]);
	long_stat("total number of structs", stats.s_types[CTF_K_STRUCT]);
	long_stat("total number of unions", stats.s_types[CTF_K_UNION]);
	long_stat("total number of enums", stats.s_types[CTF_K_ENUM]);
	long_stat("total number of forward tags", stats.s_types[CTF_K_FORWARD]);
	long_stat("total number of typedefs", stats.s_types[CTF_K_TYPEDEF]);
	long_stat("total number of volatile types",
	    stats.s_types[CTF_K_VOLATILE]);
	long_stat("total number of const types", stats.s_types[CTF_K_CONST]);
	long_stat("total number of restrict types",
	    stats.s_types[CTF_K_RESTRICT]);
	long_stat("total number of unknowns (holes)",
	    stats.s_types[CTF_K_UNKNOWN]);

	(void) printf("\n");

	long_stat("total number of struct members", stats.s_nsmem);
	long_stat("maximum number of struct members", stats.s_smmax);
	long_stat("total size of all structs", stats.s_nsbytes);
	long_stat("maximum size of a struct", stats.s_sbmax);

	if (stats.s_types[CTF_K_STRUCT] != 0) {
		fp_stat("average number of struct members",
		    (float)stats.s_nsmem / (float)stats.s_types[CTF_K_STRUCT]);
		fp_stat("average size of a struct", (float)stats.s_nsbytes /
		    (float)stats.s_types[CTF_K_STRUCT]);
	}

	(void) printf("\n");

	long_stat("total number of union members", stats.s_numem);
	long_stat("maximum number of union members", stats.s_ummax);
	long_stat("total size of all unions", stats.s_nubytes);
	long_stat("maximum size of a union", stats.s_ubmax);

	if (stats.s_types[CTF_K_UNION] != 0) {
		fp_stat("average number of union members",
		    (float)stats.s_numem / (float)stats.s_types[CTF_K_UNION]);
		fp_stat("average size of a union", (float)stats.s_nubytes /
		    (float)stats.s_types[CTF_K_UNION]);
	}

	(void) printf("\n");

	long_stat("total number of enum members", stats.s_nemem);
	long_stat("maximum number of enum members", stats.s_emmax);

	if (stats.s_types[CTF_K_ENUM] != 0) {
		fp_stat("average number of enum members",
		    (float)stats.s_nemem / (float)stats.s_types[CTF_K_ENUM]);
	}

	(void) printf("\n");

	long_stat("total number of unique strings", stats.s_nstr);
	long_stat("bytes of string data", stats.s_strlen);
	long_stat("maximum string length", stats.s_strmax);

	if (stats.s_nstr != 0) {
		fp_stat("average string length",
		    (float)stats.s_strlen / (float)stats.s_nstr);
	}

	(void) printf("\n");
	return (E_SUCCESS);
}

static int
print_usage(FILE *fp, int verbose)
{
	(void) fprintf(fp, "Usage: %s [-dfhlsSt] [-u file] file\n", getprogname());

	if (verbose) {
		(void) fprintf(fp,
		    "\t-d  dump data object section\n"
		    "\t-f  dump function section\n"
		    "\t-h  dump file header\n"
		    "\t-l  dump label table\n"
		    "\t-s  dump string table\n"
		    "\t-S  dump statistics\n"
		    "\t-t  dump type section\n"
		    "\t-u  save uncompressed CTF to a file\n");
	}

	return (E_USAGE);
}

static Elf_Scn *
findelfscn(Elf *elf, GElf_Ehdr *ehdr, const char *secname)
{
	GElf_Shdr shdr;
	Elf_Scn *scn;
	char *name;

	for (scn = NULL; (scn = elf_nextscn(elf, scn)) != NULL; ) {
		if (gelf_getshdr(scn, &shdr) != NULL && (name =
		    elf_strptr(elf, ehdr->e_shstrndx, shdr.sh_name)) != NULL &&
		    strcmp(name, secname) == 0)
			return (scn);
	}

	return (NULL);
}

int
main(int argc, char *argv[])
{
	const char *filename = NULL;
	const char *ufile = NULL;
	int error = 0;
	int c, fd, ufd;

	ctf_data_t cd;
	const ctf_preamble_t *pp;
	ctf_header_t *hp = NULL;
	Elf *elf;
	GElf_Ehdr ehdr;

	(void) elf_version(EV_CURRENT);

	for (opterr = 0; optind < argc; optind++) {
		while ((c = getopt(argc, argv, "dfhlsStu:")) != (int)EOF) {
			switch (c) {
			case 'd':
				flags |= F_DATA;
				break;
			case 'f':
				flags |= F_FUNC;
				break;
			case 'h':
				flags |= F_HDR;
				break;
			case 'l':
				flags |= F_LABEL;
				break;
			case 's':
				flags |= F_STR;
				break;
			case 'S':
				flags |= F_STATS;
				break;
			case 't':
				flags |= F_TYPES;
				break;
			case 'u':
				ufile = optarg;
				break;
			default:
				if (optopt == '?')
					return (print_usage(stdout, 1));
				warn("illegal option -- %c\n", optopt);
				return (print_usage(stderr, 0));
			}
		}

		if (optind < argc) {
			if (filename != NULL)
				return (print_usage(stderr, 0));
			filename = argv[optind];
		}
	}

	if (filename == NULL)
		return (print_usage(stderr, 0));

	if (flags == 0 && ufile == NULL)
		flags = F_ALLMSK;

	if ((fd = open(filename, O_RDONLY)) == -1)
		die("failed to open %s", filename);

	if ((elf = elf_begin(fd, ELF_C_READ, NULL)) != NULL &&
	    gelf_getehdr(elf, &ehdr) != NULL) {

		Elf_Data *dp = NULL;
		Elf_Scn *ctfscn = findelfscn(elf, &ehdr, ".SUNW_ctf");
		Elf_Scn *symscn;
		GElf_Shdr ctfshdr;

		if (ctfscn == NULL || (dp = elf_getdata(ctfscn, NULL)) == NULL)
			die("%s does not contain .SUNW_ctf data\n", filename);

		cd.cd_ctfdata = dp->d_buf;
		cd.cd_ctflen = dp->d_size;

		/*
		 * If the sh_link field of the CTF section header is non-zero
		 * it indicates which section contains the symbol table that
		 * should be used. We default to the .symtab section if sh_link
		 * is zero or if there's an error reading the section header.
		 */
		if (gelf_getshdr(ctfscn, &ctfshdr) != NULL &&
		    ctfshdr.sh_link != 0) {
			symscn = elf_getscn(elf, ctfshdr.sh_link);
		} else {
			symscn = findelfscn(elf, &ehdr, ".symtab");
		}

		/* If we found a symbol table, find the corresponding strings */
		if (symscn != NULL) {
			GElf_Shdr shdr;
			Elf_Scn *symstrscn;

			if (gelf_getshdr(symscn, &shdr) != NULL) {
				symstrscn = elf_getscn(elf, shdr.sh_link);

				cd.cd_nsyms = shdr.sh_size / shdr.sh_entsize;
				cd.cd_symdata = elf_getdata(symscn, NULL);
				cd.cd_strdata = elf_getdata(symstrscn, NULL);
			}
		}
	} else {
		struct stat st;

		if (fstat(fd, &st) == -1)
			die("failed to fstat %s", filename);

		cd.cd_ctflen = st.st_size;
		cd.cd_ctfdata = mmap(NULL, cd.cd_ctflen, PROT_READ,
		    MAP_PRIVATE, fd, 0);
		if (cd.cd_ctfdata == MAP_FAILED)
			die("failed to mmap %s", filename);
	}

	/*
	 * Get a pointer to the CTF data buffer and interpret the first portion
	 * as a ctf_header_t.  Validate the magic number and size.
	 */

	if (cd.cd_ctflen < sizeof (ctf_preamble_t))
		die("%s does not contain a CTF preamble\n", filename);

	void *v = (void *) cd.cd_ctfdata;
	pp = v;

	if (pp->ctp_magic != CTF_MAGIC)
		die("%s does not appear to contain CTF data\n", filename);

	if (pp->ctp_version >= CTF_VERSION_2) {
		v = (void *) cd.cd_ctfdata;
		hp = v;
		cd.cd_ctfdata = (caddr_t)cd.cd_ctfdata + sizeof (ctf_header_t);

		cd.cd_idwidth = pp->ctp_version == CTF_VERSION_2 ? 2 : 4;

		if (cd.cd_ctflen < sizeof (ctf_header_t)) {
			die("%s does not contain a v%d CTF header\n", filename,
			    pp->ctp_version);
		}

	} else {
		die("%s contains unsupported CTF version %d\n", filename,
		    pp->ctp_version);
	}

	/*
	 * If the data buffer is compressed, then malloc a buffer large enough
	 * to hold the decompressed data, and use zlib to decompress it.
	 */
	if (hp->cth_flags & CTF_F_COMPRESS) {
		z_stream zstr;
		void *buf;
		int rc;

		if ((buf = malloc(hp->cth_stroff + hp->cth_strlen)) == NULL)
			die("failed to allocate decompression buffer");

		bzero(&zstr, sizeof (z_stream));
		zstr.next_in = (void *)cd.cd_ctfdata;
		zstr.avail_in = cd.cd_ctflen;
		zstr.next_out = buf;
		zstr.avail_out = hp->cth_stroff + hp->cth_strlen;

		if ((rc = inflateInit(&zstr)) != Z_OK)
			die("failed to initialize zlib: %s\n", zError(rc));

		if ((rc = inflate(&zstr, Z_FINISH)) != Z_STREAM_END)
			die("failed to decompress CTF data: %s\n", zError(rc));

		if ((rc = inflateEnd(&zstr)) != Z_OK)
			die("failed to finish decompression: %s\n", zError(rc));

		if (zstr.total_out != hp->cth_stroff + hp->cth_strlen)
			die("CTF data is corrupt -- short decompression\n");

		cd.cd_ctfdata = buf;
		cd.cd_ctflen = hp->cth_stroff + hp->cth_strlen;
	}

	if (flags & F_HDR)
		error |= print_header(hp, &cd);
	if (flags & (F_LABEL))
		error |= print_labeltable(hp, &cd);
	if (flags & (F_DATA | F_STATS))
		error |= read_data(hp, &cd);
	if (flags & (F_FUNC | F_STATS))
		error |= read_funcs(hp, &cd);
	if (flags & (F_TYPES | F_STATS))
		error |= read_types(hp, &cd);
	if (flags & (F_STR | F_STATS))
		error |= read_strtab(hp, &cd);
	if (flags & F_STATS)
		error |= print_stats();

	/*
	 * If the -u option is specified, write the uncompressed CTF data to a
	 * raw CTF file.  CTF data can already be extracted compressed by
	 * applying elfdump -w -N .SUNW_ctf to an ELF file, so we don't bother.
	 */
	if (ufile != NULL) {
		ctf_header_t h;

		bcopy(hp, &h, sizeof (h));
		h.cth_flags &= ~CTF_F_COMPRESS;

		if ((ufd = open(ufile, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0 ||
		    write(ufd, &h, sizeof (h)) != sizeof (h) ||
		    write(ufd, cd.cd_ctfdata, cd.cd_ctflen) != (int) cd.cd_ctflen) {
			warn("failed to write CTF data to '%s'", ufile);
			error |= E_ERROR;
		}

		(void) close(ufd);
	}

	if (elf != NULL)
		(void) elf_end(elf);

	(void) close(fd);
	return (error);
}