From patchwork Fri Aug 7 12:06:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Tzvetomir Stoyanov (VMware)" X-Patchwork-Id: 11705601 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5507D722 for ; Fri, 7 Aug 2020 12:07:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2DCAF2086A for ; Fri, 7 Aug 2020 12:07:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="YNbM96AJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728408AbgHGMHg (ORCPT ); Fri, 7 Aug 2020 08:07:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51826 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728207AbgHGMHD (ORCPT ); Fri, 7 Aug 2020 08:07:03 -0400 Received: from mail-wm1-x342.google.com (mail-wm1-x342.google.com [IPv6:2a00:1450:4864:20::342]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C05F4C061756 for ; Fri, 7 Aug 2020 05:07:02 -0700 (PDT) Received: by mail-wm1-x342.google.com with SMTP id p14so1525484wmg.1 for ; Fri, 07 Aug 2020 05:07:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ddfapRR3yI6ItDyKcCaWGIIMdo3dhUzG22IJ4Q6T/34=; b=YNbM96AJJC5dxebftIqLhe1tag0GzjDndx/Zs7y6BQo9NgrjrNTo6EH/fohb9MSbjn BPrHB4yP0BKNitBuLFTrlibWMFKetl1TEr0tW2VIous+AvHnwu8Zcj27oOKD5StLXXxf TPUhOC/bz93vfek9bpYpLXymk7KHJkGcHGrRTVeNfHzzRe6RcnUjyVN3wZHQdLcmCoDe ZWGhXrAXgK4fKUlME/t1Bv6mlXZe2Hs6fkWlH8ixpwbS3N1ThgIiCnUSDu24sqqtffmP qsnmGJSVm9QjjNcKH4tTJEz5NxDcYK2nI7gc/G4tG1nGf/Y5xM6Es0Z59ygSs0HgoixF qEEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ddfapRR3yI6ItDyKcCaWGIIMdo3dhUzG22IJ4Q6T/34=; b=lt4oImUiQCq/4HbnrhQDRpHvpqSip727XyRrzqfvl6XH1PQEYvU98NlFA9+XT4prsa WBpJTeB7GdixMzWIp/ERe+G+Mj8ym6J7o8QrSODR/KpoRzZQmAKh/F3wApKyizSlTfyj HZmxRuuVe/FoBuXqp9ZwI8MdvxQZ4E54H1ElYgINx8eB4guHg0PU+wTONcDz1+mGH6Xp gMKp/u2Q2WthrGkLsip8GHlqc2/TELyv8PihgwXOtrRnd3R8z89v5KcF7pLwckr6V1tp QBEmrryLiOJhS0jmoXloHYD0VP7qmxk8gNBIiTtRtppuaL/XBYztdwPDRj/Li7BFtt3S Onag== X-Gm-Message-State: AOAM5303+DCsD6JKhvltjFxkFi8TgvVI/kYR4bCYwJlmGZjKMhmnL9w9 6K6VVtC5UKmmXWZcfL0qL84= X-Google-Smtp-Source: ABdhPJxkmQBCtq2rLz5RmN1V3YuUj7EAuCywDFUlRjDWiGRkaDDRIh6KcefoVpM7vXoAYxb6E5XFZQ== X-Received: by 2002:a7b:c954:: with SMTP id i20mr13508643wml.189.1596802021163; Fri, 07 Aug 2020 05:07:01 -0700 (PDT) Received: from oberon.zico.biz ([83.222.187.186]) by smtp.gmail.com with ESMTPSA id p6sm10485303wmg.0.2020.08.07.05.07.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Aug 2020 05:07:00 -0700 (PDT) From: "Tzvetomir Stoyanov (VMware)" To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH 2/4] trace-cmd: New internal APIs for reading ELF header Date: Fri, 7 Aug 2020 15:06:53 +0300 Message-Id: <20200807120655.797084-3-tz.stoyanov@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200807120655.797084-1-tz.stoyanov@gmail.com> References: <20200807120655.797084-1-tz.stoyanov@gmail.com> MIME-Version: 1.0 Sender: linux-trace-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org Implemented new trace-cmd internal APIs for parsing ELF header and resolving VMA to function name and function name to VMA and file offset. The bfd library is used to read and parse the binary file. The new APIs are part of trace-cmd application and are visible only inside its context. Signed-off-by: Tzvetomir Stoyanov (VMware) --- Makefile | 10 + include/trace-cmd/trace-cmd.h | 8 + tracecmd/include/trace-local.h | 12 + tracecmd/trace-obj-debug.c | 632 +++++++++++++++++++++++++++++++++ 4 files changed, 662 insertions(+) diff --git a/Makefile b/Makefile index b0340427..0d657969 100644 --- a/Makefile +++ b/Makefile @@ -245,6 +245,16 @@ endif CUNIT_INSTALLED := $(shell if (printf "$(pound)include \n void main(){CU_initialize_registry();}" | $(CC) -x c - -lcunit >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi) export CUNIT_INSTALLED +BFD_INSTALLED := $(shell if (echo -e "\#include \n void main(){bfd_init();}" | $(CC) -xc - -lbfd >/dev/null 2>&1) ; then echo 1; else echo 0 ; fi) + +export BFD_INSTALLED +ifeq ($(BFD_INSTALLED), 1) +CFLAGS += -DBFD_INSTALLED +LIBS += -lbfd +else +$(warning libbfd is not installed) +endif + export CFLAGS export INCLUDES diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h index f3c95f30..5ebd076e 100644 --- a/include/trace-cmd/trace-cmd.h +++ b/include/trace-cmd/trace-cmd.h @@ -135,6 +135,14 @@ struct tracecmd_proc_addr_map { char *lib_name; }; +struct tracecmd_debug_symbols { + char *name; /* symbol's name */ + char *fname; /* symbol's file */ + unsigned long long vma_start; /* symbol's start VMA */ + unsigned long long vma_near; /* symbol's requested VMA */ + unsigned long long foffset; /* symbol's offset in the binary file*/ +}; + typedef void (*tracecmd_show_data_func)(struct tracecmd_input *handle, struct tep_record *record); typedef void (*tracecmd_handle_init_func)(struct tracecmd_input *handle, diff --git a/tracecmd/include/trace-local.h b/tracecmd/include/trace-local.h index c5c225e0..ccae61d4 100644 --- a/tracecmd/include/trace-local.h +++ b/tracecmd/include/trace-local.h @@ -317,4 +317,16 @@ struct pid_addr_maps { int trace_debug_get_filemap(struct pid_addr_maps **file_maps, int pid); void trace_debug_free_filemap(struct pid_addr_maps *maps); +struct trace_debug_object; +struct trace_debug_object *trace_debug_obj_create_file(char *file); +struct trace_debug_object *trace_debug_obj_create_pid(int pid); +void trace_debug_obj_destroy(struct trace_debug_object *debug); + +int trace_debug_resolve_symbols(struct trace_debug_object *obj); +int trace_debug_add_resolve_symbol(struct trace_debug_object *obj, + unsigned long long vma, char *name); + +void trace_debug_walk_resolved_symbols(struct trace_debug_object *obj, + int (*callback)(struct tracecmd_debug_symbols *, void *), + void *context); #endif /* __TRACE_LOCAL_H */ diff --git a/tracecmd/trace-obj-debug.c b/tracecmd/trace-obj-debug.c index 9aa9baae..b3bdc486 100644 --- a/tracecmd/trace-obj-debug.c +++ b/tracecmd/trace-obj-debug.c @@ -4,10 +4,642 @@ * */ #include +#include +#include +#include #include +#include #include #include "trace-local.h" +#include "trace-cmd.h" + +#ifdef BFD_INSTALLED + +struct trace_debug_handle { + bfd *bfd; + unsigned long long addr_offset; +}; + +struct trace_debug_vmem_range { + struct trace_debug_vmem_range *next; + unsigned long long start; + unsigned long long end; +}; + +struct debug_symbols { + struct debug_symbols *next; + struct tracecmd_debug_symbols symbol; +}; + +struct trace_debug_file { + struct trace_debug_file *next; + char *file_name; + struct trace_debug_vmem_range *vmem; + struct trace_debug_handle *dbg; + int sym_count; + struct debug_symbols *sym; /* symbols to resolve, + * look in this file only + */ +}; + +struct trace_debug_object { + int pid; + char *fname; + struct pid_addr_maps *fmaps; + int sym_count; + struct debug_symbols *sym; /* symbols to resolve, + * look into all files + */ + struct trace_debug_file *files; +}; + +#define RESOLVE_NAME (1 << 0) +#define RESOLVE_VMA (1 << 1) +#define RESOLVE_FOFFSET (1 << 2) +struct trace_obj_job { + unsigned int flags; + unsigned long long addr_offset; + struct debug_symbols *symbols; +}; + +struct dwarf_bfd_context { + asymbol **table; + struct trace_obj_job *job; +}; + +static void bfd_dwarf_section(bfd *abfd, asection *section, void *param) +{ + struct dwarf_bfd_context *context = (struct dwarf_bfd_context *)param; + unsigned int discriminator; + const char *functionname; + struct debug_symbols *s; + unsigned long long vma; + const char *filename; + unsigned int line; + bfd_boolean found; + + if (!(section->flags & SEC_CODE)) + return; + + for (s = context->job->symbols; s; s = s->next) { + if (!s->symbol.vma_near) + continue; + if (abfd->flags & DYNAMIC) + vma = s->symbol.vma_near - context->job->addr_offset; + else + vma = s->symbol.vma_near; + if (vma && section->vma <= vma && + (section->vma + section->size) > vma) { + if (!s->symbol.fname) + s->symbol.fname = strdup(abfd->filename); + if (context->job->flags & RESOLVE_FOFFSET) + s->symbol.foffset = section->filepos + (vma - section->vma); + if (!s->symbol.name && (context->job->flags & RESOLVE_NAME)) { + found = bfd_find_nearest_line_discriminator(abfd, section, context->table, + vma - section->vma, &filename, + &functionname, &line, &discriminator); + if (found) + s->symbol.name = strdup(functionname); + } + } + } +} + +static asymbol **get_sym_table(bfd *handle) +{ + bfd_boolean dyn = FALSE; + asymbol **symtable; + long count; + long size; + + if ((bfd_get_file_flags(handle) & HAS_SYMS) == 0) + return NULL; + size = bfd_get_symtab_upper_bound(handle); + if (size == 0) { + size = bfd_get_dynamic_symtab_upper_bound(handle); + dyn = TRUE; + } + if (size <= 0) + return NULL; + + symtable = (asymbol **) calloc(1, size); + if (!symtable) + return NULL; + if (dyn) + count = bfd_canonicalize_dynamic_symtab(handle, symtable); + else + count = bfd_canonicalize_symtab(handle, symtable); + if (count <= 0) { + free(symtable); + return NULL; + } +/* + * alloc = bfd_demangle(cur_bfd, name, demangle_flags); + */ + + return symtable; +} + +static int bfd_symlookup(struct dwarf_bfd_context *context) +{ + struct debug_symbols *s; + asymbol **sp; + int res = 0; + + for (sp = context->table; *sp != NULL; sp++) { + if (!((*sp)->flags & BSF_FUNCTION)) + continue; + for (s = context->job->symbols; s; s = s->next) { + if (!s->symbol.name || + (strlen(s->symbol.name) != strlen((*sp)->name))) + continue; + if (!strcmp(s->symbol.name, (*sp)->name)) { + s->symbol.vma_start = (*sp)->value + (*sp)->section->vma; + if ((*sp)->the_bfd->flags & DYNAMIC) + s->symbol.vma_start += context->job->addr_offset; + res++; + } + } + } + return res; +} + +static int bfd_process_object(bfd *abfd, struct trace_obj_job *job) +{ + struct dwarf_bfd_context context; + int ret = 0; + + memset(&context, 0, sizeof(context)); + context.job = job; + + if (bfd_check_format_matches(abfd, bfd_object, NULL) || + bfd_check_format_matches(abfd, bfd_core, NULL)) { + context.table = get_sym_table(abfd); + if (job->flags & RESOLVE_VMA) + bfd_symlookup(&context); + if ((job->flags & RESOLVE_NAME) || (job->flags & RESOLVE_FOFFSET)) + bfd_map_over_sections(abfd, bfd_dwarf_section, &context); + free(context.table); + } else { + ret = -1; + } + + return ret; +} + +static int bfd_read_all(bfd *abfd, struct trace_obj_job *job) +{ + bfd *last_arfile = NULL; + bfd *arfile = NULL; + int ret = 0; + + if (bfd_check_format(abfd, bfd_archive)) { + for (;;) { + bfd_set_error(bfd_error_no_error); + arfile = bfd_openr_next_archived_file(abfd, arfile); + if (!arfile) { + if (bfd_get_error() != bfd_error_no_more_archived_files) + break; + } + ret = bfd_read_all(arfile, job); + if (last_arfile) + bfd_close(last_arfile); + last_arfile = arfile; + } + if (last_arfile) + bfd_close(last_arfile); + } else + ret = bfd_process_object(abfd, job); + + return ret; +} + +/** + * resolve_symbol_vma - name -> (vma, file offset) resolving + * @obj - pointer to object, returned by trace_obj_debug_create() + * @symbols - link list with desired symbols, with given name + * + * Get VMA and file offset of the symbols with given name + * Return 0 on success, -1 on error + */ +static int resolve_symbol_vma(struct trace_debug_handle *obj, + struct debug_symbols *symbols) +{ + struct trace_obj_job job; + int ret; + + memset(&job, 0, sizeof(job)); + job.flags |= RESOLVE_VMA; + job.flags |= RESOLVE_FOFFSET; + job.symbols = symbols; + job.addr_offset = obj->addr_offset; + ret = bfd_read_all(obj->bfd, &job); + + return ret; +} + +/** + * resolve_symbol_name - vma -> name resolving + * @obj - pointer to object, returned by trace_obj_debug_create() + * @symbols - link list with desired symbols, with given VMA + * + * Get names of the symbols with given VMA, look for nearest symbol to that VMA + * Return 0 on success, -1 on error + */ +static int resolve_symbol_name(struct trace_debug_handle *obj, + struct debug_symbols *symbols) +{ + struct trace_obj_job job; + + if (!obj || !obj->bfd) + return -1; + memset(&job, 0, sizeof(job)); + job.flags |= RESOLVE_NAME; + job.addr_offset = obj->addr_offset; + job.symbols = symbols; + return bfd_read_all(obj->bfd, &job); +} + +/** + * debug_handle_destroy - Close file opened with trace_obj_debug_create() + * @obj - pointer to object, returned by trace_obj_debug_create() + * + * Close the file and free any allocated resources, related to file's debug + * information + */ +static void debug_handle_destroy(struct trace_debug_handle *obj) +{ + if (obj && obj->bfd) + bfd_close(obj->bfd); + free(obj); +} + +/** + * debug_handle_create - Open binary file for parsing ELF and DWARF information + * @name: Name of the binary ELF file. + * + * Return pointer to trace_obj_debug structure, that can be passed to other APIs + * for extracting debug information from the file. NULL in case of an error. + */ +static struct trace_debug_handle *debug_handle_create(char *file) +{ + struct trace_debug_handle *obj = NULL; + + obj = calloc(1, sizeof(*obj)); + if (!obj) + return NULL; + + bfd_init(); + obj->bfd = bfd_openr(file, NULL); + if (!obj->bfd) + goto error; + obj->bfd->flags |= BFD_DECOMPRESS; + + return obj; + +error: + debug_handle_destroy(obj); + return NULL; +} + +static void set_vma_offset(struct trace_debug_handle *obj, + unsigned long long addr_offset) +{ + if (obj) + obj->addr_offset = addr_offset; +} + +static char *get_full_name(int pid) +{ + char mapname[PATH_MAX+1]; + char fname[PATH_MAX+1]; + int ret; + + sprintf(fname, "/proc/%d/exe", pid); + ret = readlink(fname, mapname, PATH_MAX); + if (ret >= PATH_MAX || ret < 0) + return NULL; + mapname[ret] = 0; + + return strdup(mapname); +} + +static struct trace_debug_file *get_mapped_file(struct trace_debug_object *dbg, char *fname) +{ + struct trace_debug_file *file = dbg->files; + + while (file) { + if (!strcmp(fname, file->file_name)) + break; + file = file->next; + } + if (file) + return file; + + file = calloc(1, sizeof(*file)); + if (!file) + return NULL; + file->file_name = strdup(fname); + file->dbg = debug_handle_create(fname); + file->next = dbg->files; + dbg->files = file; + return file; +} + +void trace_debug_obj_destroy(struct trace_debug_object *dbg) +{ + struct trace_debug_vmem_range *mdel; + struct trace_debug_file *fdel; + struct debug_symbols *sdel; + + while (dbg->sym) { + sdel = dbg->sym; + dbg->sym = dbg->sym->next; + free(sdel->symbol.name); + free(sdel->symbol.fname); + free(sdel); + } + while (dbg->files) { + fdel = dbg->files; + dbg->files = dbg->files->next; + debug_handle_destroy(fdel->dbg); + while (fdel->sym) { + sdel = fdel->sym; + fdel->sym = fdel->sym->next; + free(sdel->symbol.name); + free(sdel->symbol.fname); + free(sdel); + } + while (fdel->vmem) { + mdel = fdel->vmem; + fdel->vmem = fdel->vmem->next; + free(mdel); + } + free(fdel); + } + + free(dbg->fname); + trace_debug_free_filemap(dbg->fmaps); + free(dbg); +} + +struct trace_debug_object *trace_debug_obj_create_pid(int pid) +{ + struct trace_debug_vmem_range *mem; + struct trace_debug_object *dbg; + struct trace_debug_file *file; + int i; + + dbg = calloc(1, sizeof(*dbg)); + if (!dbg) + return NULL; + + dbg->pid = pid; + dbg->fname = get_full_name(pid); + trace_debug_get_filemap(&dbg->fmaps, pid); + + for (i = 0; i < dbg->fmaps->nr_lib_maps; i++) { + file = get_mapped_file(dbg, dbg->fmaps->lib_maps[i].lib_name); + if (!file) + goto error; + if (file->vmem && file->vmem->end == dbg->fmaps->lib_maps[i].start) { + file->vmem->end = dbg->fmaps->lib_maps[i].end; + } else { + mem = calloc(1, sizeof(*mem)); + if (!mem) + goto error; + mem->start = dbg->fmaps->lib_maps[i].start; + mem->end = dbg->fmaps->lib_maps[i].end; + mem->next = file->vmem; + file->vmem = mem; + set_vma_offset(file->dbg, mem->start); + } + } + return dbg; + +error: + trace_debug_obj_destroy(dbg); + return NULL; +} + +struct trace_debug_object *trace_debug_obj_create_file(char *fname) +{ + struct trace_debug_object *dbg; + struct trace_debug_file *file; + + dbg = calloc(1, sizeof(*dbg)); + if (!dbg) + return NULL; + + dbg->fname = strdup(fname); + file = get_mapped_file(dbg, fname); + if (!file) + goto error; + + return dbg; + +error: + trace_debug_obj_destroy(dbg); + return NULL; +} + +static void set_unknown(struct debug_symbols *sym, char *file) +{ + while (sym) { + if (!sym->symbol.fname) + sym->symbol.fname = strdup(file); + sym = sym->next; + } +} + +int trace_debug_resolve_symbols(struct trace_debug_object *obj) +{ + struct trace_debug_file *file; + + for (file = obj->files; file; file = file->next) { + if (!file->dbg) { + set_unknown(file->sym, file->file_name); + continue; + } + /* near VMA -> name resolving */ + resolve_symbol_name(file->dbg, file->sym); + /* name -> exact VMA resolving */ + resolve_symbol_vma(file->dbg, file->sym); + resolve_symbol_vma(file->dbg, obj->sym); + } + + return 0; +} + +static int add_resolve_vma2name(struct trace_debug_object *obj, + unsigned long long vma) +{ + struct trace_debug_vmem_range *vmem; + struct debug_symbols *s = NULL; + struct trace_debug_file *file; + + file = obj->files; + while (file) { + if (!file->vmem) + break; + vmem = file->vmem; + while (vmem) { + if (vma >= vmem->start && vma <= vmem->end) + break; + vmem = vmem->next; + } + if (vmem) + break; + file = file->next; + } + if (file) { + s = file->sym; + while (s) { + if (s->symbol.vma_near == vma) + break; + s = s->next; + } + if (!s) { + s = calloc(1, sizeof(*s)); + if (!s) + return -1; + s->symbol.vma_near = vma; + s->next = file->sym; + file->sym = s; + file->sym_count++; + } + } + + if (s) + return 0; + return -1; +} + +static int add_resolve_name2vma(struct trace_debug_object *obj, char *name) +{ + struct debug_symbols *s = NULL; + + s = obj->sym; + while (s) { + if (s->symbol.name && !strcmp(name, s->symbol.name)) + break; + s = s->next; + } + if (!s) { + s = calloc(1, sizeof(*s)); + if (!s) + return -1; + s->symbol.name = strdup(name); + if (!s->symbol.name) { + free(s); + return -1; + } + s->next = obj->sym; + obj->sym = s; + obj->sym_count++; + } + + return 0; +} + +int trace_debug_add_resolve_symbol(struct trace_debug_object *obj, + unsigned long long vma, char *name) +{ + int ret = -1; + + if (!obj) + return -1; + + if (!name && vma) /* vma -> name resolving */ + ret = add_resolve_vma2name(obj, vma); + else if (name) /* name -> vma resolving */ + ret = add_resolve_name2vma(obj, name); + + return ret; +} + +static int walk_symbols(struct debug_symbols *sym, + int (*callback)(struct tracecmd_debug_symbols *, void *), + void *context) +{ + while (sym) { + if (callback(&sym->symbol, context)) + return -1; + sym = sym->next; + } + + return 0; +} + +void trace_debug_walk_resolved_symbols(struct trace_debug_object *obj, + int (*callback)(struct tracecmd_debug_symbols *, void *), + void *context) +{ + struct trace_debug_file *file; + + walk_symbols(obj->sym, callback, context); + file = obj->files; + while (file) { + walk_symbols(file->sym, callback, context); + file = file->next; + } +} + + +void trace_debug_free_symbols(struct tracecmd_debug_symbols *symbols, int count) +{ + int i; + + if (!symbols) + return; + + for (i = 0; i < count; i++) { + free(symbols[i].name); + free(symbols[i].fname); + } + free(symbols); + +} +#else +int trace_debug_resolve_symbols(struct trace_debug_object *obj) +{ + return -1; +} + +int trace_debug_add_resolve_symbol(struct trace_debug_object *obj, + unsigned long long vma, char *name) +{ + return -1; +} + +void trace_debug_walk_resolved_symbols(struct trace_debug_object *obj, + int (*callback)(struct tracecmd_debug_symbols *, void *), + void *context) +{ + +} + +void trace_debug_free_symbols(struct tracecmd_debug_symbols *symbols, int count) +{ + +} + +void trace_debug_obj_destroy(struct trace_debug_object *debug) +{ + +} + +struct trace_debug_object *trace_debug_obj_create_file(char *file) +{ + return NULL; +} +struct trace_debug_object *trace_debug_obj_create_pid(int pid) +{ + return NULL; +} + +#endif #define _STRINGIFY(x) #x #define STRINGIFY(x) _STRINGIFY(x)