perf-probe: Move dwarf library routines to dwarf-aux.{c, h}
Masami Hiramatsu [Mon, 27 Jun 2011 07:27:27 +0000 (16:27 +0900)]
Move dwarf library related routines to dwarf-aux.{c,h}.
This includes several minor changes.
- Add simple documents for each API.
- Rename die_find_real_subprogram() to die_find_realfunc()
- Rename line_walk_handler_t to line_walk_callback_t.
- Minor cleanups.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Link: http://lkml.kernel.org/r/20110627072727.6528.57647.stgit@fedora15
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

tools/perf/Makefile
tools/perf/util/dwarf-aux.c [new file with mode: 0644]
tools/perf/util/dwarf-aux.h [new file with mode: 0644]
tools/perf/util/probe-finder.c
tools/perf/util/probe-finder.h

index 940257b..d0861bb 100644 (file)
@@ -279,6 +279,7 @@ LIB_H += util/thread.h
 LIB_H += util/thread_map.h
 LIB_H += util/trace-event.h
 LIB_H += util/probe-finder.h
+LIB_H += util/dwarf-aux.h
 LIB_H += util/probe-event.h
 LIB_H += util/pstack.h
 LIB_H += util/cpumap.h
@@ -435,6 +436,7 @@ else
        BASIC_CFLAGS += -DDWARF_SUPPORT
        EXTLIBS += -lelf -ldw
        LIB_OBJS += $(OUTPUT)util/probe-finder.o
+       LIB_OBJS += $(OUTPUT)util/dwarf-aux.o
 endif # PERF_HAVE_DWARF_REGS
 endif # NO_DWARF
 
diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
new file mode 100644 (file)
index 0000000..fddf40f
--- /dev/null
@@ -0,0 +1,663 @@
+/*
+ * dwarf-aux.c : libdw auxiliary interfaces
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <stdbool.h>
+#include "util.h"
+#include "debug.h"
+#include "dwarf-aux.h"
+
+/**
+ * cu_find_realpath - Find the realpath of the target file
+ * @cu_die: A DIE(dwarf information entry) of CU(compilation Unit)
+ * @fname:  The tail filename of the target file
+ *
+ * Find the real(long) path of @fname in @cu_die.
+ */
+const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname)
+{
+       Dwarf_Files *files;
+       size_t nfiles, i;
+       const char *src = NULL;
+       int ret;
+
+       if (!fname)
+               return NULL;
+
+       ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
+       if (ret != 0)
+               return NULL;
+
+       for (i = 0; i < nfiles; i++) {
+               src = dwarf_filesrc(files, i, NULL, NULL);
+               if (strtailcmp(src, fname) == 0)
+                       break;
+       }
+       if (i == nfiles)
+               return NULL;
+       return src;
+}
+
+/**
+ * cu_get_comp_dir - Get the path of compilation directory
+ * @cu_die: a CU DIE
+ *
+ * Get the path of compilation directory of given @cu_die.
+ * Since this depends on DW_AT_comp_dir, older gcc will not
+ * embedded it. In that case, this returns NULL.
+ */
+const char *cu_get_comp_dir(Dwarf_Die *cu_die)
+{
+       Dwarf_Attribute attr;
+       if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL)
+               return NULL;
+       return dwarf_formstring(&attr);
+}
+
+/**
+ * cu_find_lineinfo - Get a line number and file name for given address
+ * @cu_die: a CU DIE
+ * @addr: An address
+ * @fname: a pointer which returns the file name string
+ * @lineno: a pointer which returns the line number
+ *
+ * Find a line number and file name for @addr in @cu_die.
+ */
+int cu_find_lineinfo(Dwarf_Die *cu_die, unsigned long addr,
+                   const char **fname, int *lineno)
+{
+       Dwarf_Line *line;
+       Dwarf_Addr laddr;
+
+       line = dwarf_getsrc_die(cu_die, (Dwarf_Addr)addr);
+       if (line && dwarf_lineaddr(line, &laddr) == 0 &&
+           addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) {
+               *fname = dwarf_linesrc(line, NULL, NULL);
+               if (!*fname)
+                       /* line number is useless without filename */
+                       *lineno = 0;
+       }
+
+       return *lineno ?: -ENOENT;
+}
+
+/**
+ * die_compare_name - Compare diename and tname
+ * @dw_die: a DIE
+ * @tname: a string of target name
+ *
+ * Compare the name of @dw_die and @tname. Return false if @dw_die has no name.
+ */
+bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
+{
+       const char *name;
+       name = dwarf_diename(dw_die);
+       return name ? (strcmp(tname, name) == 0) : false;
+}
+
+/**
+ * die_get_call_lineno - Get callsite line number of inline-function instance
+ * @in_die: a DIE of an inlined function instance
+ *
+ * Get call-site line number of @in_die. This means from where the inline
+ * function is called.
+ */
+int die_get_call_lineno(Dwarf_Die *in_die)
+{
+       Dwarf_Attribute attr;
+       Dwarf_Word ret;
+
+       if (!dwarf_attr(in_die, DW_AT_call_line, &attr))
+               return -ENOENT;
+
+       dwarf_formudata(&attr, &ret);
+       return (int)ret;
+}
+
+/**
+ * die_get_type - Get type DIE
+ * @vr_die: a DIE of a variable
+ * @die_mem: where to store a type DIE
+ *
+ * Get a DIE of the type of given variable (@vr_die), and store
+ * it to die_mem. Return NULL if fails to get a type DIE.
+ */
+Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
+{
+       Dwarf_Attribute attr;
+
+       if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) &&
+           dwarf_formref_die(&attr, die_mem))
+               return die_mem;
+       else
+               return NULL;
+}
+
+/* Get a type die, but skip qualifiers */
+static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
+{
+       int tag;
+
+       do {
+               vr_die = die_get_type(vr_die, die_mem);
+               if (!vr_die)
+                       break;
+               tag = dwarf_tag(vr_die);
+       } while (tag == DW_TAG_const_type ||
+                tag == DW_TAG_restrict_type ||
+                tag == DW_TAG_volatile_type ||
+                tag == DW_TAG_shared_type);
+
+       return vr_die;
+}
+
+/**
+ * die_get_real_type - Get a type die, but skip qualifiers and typedef
+ * @vr_die: a DIE of a variable
+ * @die_mem: where to store a type DIE
+ *
+ * Get a DIE of the type of given variable (@vr_die), and store
+ * it to die_mem. Return NULL if fails to get a type DIE.
+ * If the type is qualifiers (e.g. const) or typedef, this skips it
+ * and tries to find real type (structure or basic types, e.g. int).
+ */
+Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
+{
+       do {
+               vr_die = __die_get_real_type(vr_die, die_mem);
+       } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef);
+
+       return vr_die;
+}
+
+/* Get attribute and translate it as a udata */
+static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name,
+                             Dwarf_Word *result)
+{
+       Dwarf_Attribute attr;
+
+       if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
+           dwarf_formudata(&attr, result) != 0)
+               return -ENOENT;
+
+       return 0;
+}
+
+/**
+ * die_is_signed_type - Check whether a type DIE is signed or not
+ * @tp_die: a DIE of a type
+ *
+ * Get the encoding of @tp_die and return true if the encoding
+ * is signed.
+ */
+bool die_is_signed_type(Dwarf_Die *tp_die)
+{
+       Dwarf_Word ret;
+
+       if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret))
+               return false;
+
+       return (ret == DW_ATE_signed_char || ret == DW_ATE_signed ||
+               ret == DW_ATE_signed_fixed);
+}
+
+/**
+ * die_get_data_member_location - Get the data-member offset
+ * @mb_die: a DIE of a member of a data structure
+ * @offs: The offset of the member in the data structure
+ *
+ * Get the offset of @mb_die in the data structure including @mb_die, and
+ * stores result offset to @offs. If any error occurs this returns errno.
+ */
+int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs)
+{
+       Dwarf_Attribute attr;
+       Dwarf_Op *expr;
+       size_t nexpr;
+       int ret;
+
+       if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL)
+               return -ENOENT;
+
+       if (dwarf_formudata(&attr, offs) != 0) {
+               /* DW_AT_data_member_location should be DW_OP_plus_uconst */
+               ret = dwarf_getlocation(&attr, &expr, &nexpr);
+               if (ret < 0 || nexpr == 0)
+                       return -ENOENT;
+
+               if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) {
+                       pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n",
+                                expr[0].atom, nexpr);
+                       return -ENOTSUP;
+               }
+               *offs = (Dwarf_Word)expr[0].number;
+       }
+       return 0;
+}
+
+/**
+ * die_find_child - Generic DIE search function in DIE tree
+ * @rt_die: a root DIE
+ * @callback: a callback function
+ * @data: a user data passed to the callback function
+ * @die_mem: a buffer for result DIE
+ *
+ * Trace DIE tree from @rt_die and call @callback for each child DIE.
+ * If @callback returns DIE_FIND_CB_END, this stores the DIE into
+ * @die_mem and returns it. If @callback returns DIE_FIND_CB_CONTINUE,
+ * this continues to trace the tree. Optionally, @callback can return
+ * DIE_FIND_CB_CHILD and DIE_FIND_CB_SIBLING, those means trace only
+ * the children and trace only the siblings respectively.
+ * Returns NULL if @callback can't find any appropriate DIE.
+ */
+Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
+                         int (*callback)(Dwarf_Die *, void *),
+                         void *data, Dwarf_Die *die_mem)
+{
+       Dwarf_Die child_die;
+       int ret;
+
+       ret = dwarf_child(rt_die, die_mem);
+       if (ret != 0)
+               return NULL;
+
+       do {
+               ret = callback(die_mem, data);
+               if (ret == DIE_FIND_CB_END)
+                       return die_mem;
+
+               if ((ret & DIE_FIND_CB_CHILD) &&
+                   die_find_child(die_mem, callback, data, &child_die)) {
+                       memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
+                       return die_mem;
+               }
+       } while ((ret & DIE_FIND_CB_SIBLING) &&
+                dwarf_siblingof(die_mem, die_mem) == 0);
+
+       return NULL;
+}
+
+struct __addr_die_search_param {
+       Dwarf_Addr      addr;
+       Dwarf_Die       *die_mem;
+};
+
+/* die_find callback for non-inlined function search */
+static int __die_search_func_cb(Dwarf_Die *fn_die, void *data)
+{
+       struct __addr_die_search_param *ad = data;
+
+       if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
+           dwarf_haspc(fn_die, ad->addr)) {
+               memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
+               return DWARF_CB_ABORT;
+       }
+       return DWARF_CB_OK;
+}
+
+/**
+ * die_find_realfunc - Search a non-inlined function at given address
+ * @cu_die: a CU DIE which including @addr
+ * @addr: target address
+ * @die_mem: a buffer for result DIE
+ *
+ * Search a non-inlined function DIE which includes @addr. Stores the
+ * DIE to @die_mem and returns it if found. Returns NULl if failed.
+ */
+Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
+                                   Dwarf_Die *die_mem)
+{
+       struct __addr_die_search_param ad;
+       ad.addr = addr;
+       ad.die_mem = die_mem;
+       /* dwarf_getscopes can't find subprogram. */
+       if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0))
+               return NULL;
+       else
+               return die_mem;
+}
+
+/* die_find callback for inline function search */
+static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data)
+{
+       Dwarf_Addr *addr = data;
+
+       if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine &&
+           dwarf_haspc(die_mem, *addr))
+               return DIE_FIND_CB_END;
+
+       return DIE_FIND_CB_CONTINUE;
+}
+
+/**
+ * die_find_inlinefunc - Search an inlined function at given address
+ * @cu_die: a CU DIE which including @addr
+ * @addr: target address
+ * @die_mem: a buffer for result DIE
+ *
+ * Search an inlined function DIE which includes @addr. Stores the
+ * DIE to @die_mem and returns it if found. Returns NULl if failed.
+ * If several inlined functions are expanded recursively, this trace
+ * it and returns deepest one.
+ */
+Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
+                              Dwarf_Die *die_mem)
+{
+       Dwarf_Die tmp_die;
+
+       sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die);
+       if (!sp_die)
+               return NULL;
+
+       /* Inlined function could be recursive. Trace it until fail */
+       while (sp_die) {
+               memcpy(die_mem, sp_die, sizeof(Dwarf_Die));
+               sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr,
+                                       &tmp_die);
+       }
+
+       return die_mem;
+}
+
+/* Line walker internal parameters */
+struct __line_walk_param {
+       const char *fname;
+       line_walk_callback_t callback;
+       void *data;
+       int retval;
+};
+
+static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data)
+{
+       struct __line_walk_param *lw = data;
+       Dwarf_Addr addr;
+       int lineno;
+
+       if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) {
+               lineno = die_get_call_lineno(in_die);
+               if (lineno > 0 && dwarf_entrypc(in_die, &addr) == 0) {
+                       lw->retval = lw->callback(lw->fname, lineno, addr,
+                                                 lw->data);
+                       if (lw->retval != 0)
+                               return DIE_FIND_CB_END;
+               }
+       }
+       return DIE_FIND_CB_SIBLING;
+}
+
+/* Walk on lines of blocks included in given DIE */
+static int __die_walk_funclines(Dwarf_Die *sp_die,
+                               line_walk_callback_t callback, void *data)
+{
+       struct __line_walk_param lw = {
+               .callback = callback,
+               .data = data,
+               .retval = 0,
+       };
+       Dwarf_Die die_mem;
+       Dwarf_Addr addr;
+       int lineno;
+
+       /* Handle function declaration line */
+       lw.fname = dwarf_decl_file(sp_die);
+       if (lw.fname && dwarf_decl_line(sp_die, &lineno) == 0 &&
+           dwarf_entrypc(sp_die, &addr) == 0) {
+               lw.retval = callback(lw.fname, lineno, addr, data);
+               if (lw.retval != 0)
+                       goto done;
+       }
+       die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem);
+done:
+       return lw.retval;
+}
+
+static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data)
+{
+       struct __line_walk_param *lw = data;
+
+       lw->retval = __die_walk_funclines(sp_die, lw->callback, lw->data);
+       if (lw->retval != 0)
+               return DWARF_CB_ABORT;
+
+       return DWARF_CB_OK;
+}
+
+/**
+ * die_walk_lines - Walk on lines inside given DIE
+ * @rt_die: a root DIE (CU or subprogram)
+ * @callback: callback routine
+ * @data: user data
+ *
+ * Walk on all lines inside given @rt_die and call @callback on each line.
+ * If the @rt_die is a function, walk only on the lines inside the function,
+ * otherwise @rt_die must be a CU DIE.
+ * Note that this walks not only dwarf line list, but also function entries
+ * and inline call-site.
+ */
+int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data)
+{
+       Dwarf_Lines *lines;
+       Dwarf_Line *line;
+       Dwarf_Addr addr;
+       const char *fname;
+       int lineno, ret = 0;
+       Dwarf_Die die_mem, *cu_die;
+       size_t nlines, i;
+
+       /* Get the CU die */
+       if (dwarf_tag(rt_die) == DW_TAG_subprogram)
+               cu_die = dwarf_diecu(rt_die, &die_mem, NULL, NULL);
+       else
+               cu_die = rt_die;
+       if (!cu_die) {
+               pr_debug2("Failed to get CU from subprogram\n");
+               return -EINVAL;
+       }
+
+       /* Get lines list in the CU */
+       if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) {
+               pr_debug2("Failed to get source lines on this CU.\n");
+               return -ENOENT;
+       }
+       pr_debug2("Get %zd lines from this CU\n", nlines);
+
+       /* Walk on the lines on lines list */
+       for (i = 0; i < nlines; i++) {
+               line = dwarf_onesrcline(lines, i);
+               if (line == NULL ||
+                   dwarf_lineno(line, &lineno) != 0 ||
+                   dwarf_lineaddr(line, &addr) != 0) {
+                       pr_debug2("Failed to get line info. "
+                                 "Possible error in debuginfo.\n");
+                       continue;
+               }
+               /* Filter lines based on address */
+               if (rt_die != cu_die)
+                       /*
+                        * Address filtering
+                        * The line is included in given function, and
+                        * no inline block includes it.
+                        */
+                       if (!dwarf_haspc(rt_die, addr) ||
+                           die_find_inlinefunc(rt_die, addr, &die_mem))
+                               continue;
+               /* Get source line */
+               fname = dwarf_linesrc(line, NULL, NULL);
+
+               ret = callback(fname, lineno, addr, data);
+               if (ret != 0)
+                       return ret;
+       }
+
+       /*
+        * Dwarf lines doesn't include function declarations and inlined
+        * subroutines. We have to check functions list or given function.
+        */
+       if (rt_die != cu_die)
+               ret = __die_walk_funclines(rt_die, callback, data);
+       else {
+               struct __line_walk_param param = {
+                       .callback = callback,
+                       .data = data,
+                       .retval = 0,
+               };
+               dwarf_getfuncs(cu_die, __die_walk_culines_cb, &param, 0);
+               ret = param.retval;
+       }
+
+       return ret;
+}
+
+struct __find_variable_param {
+       const char *name;
+       Dwarf_Addr addr;
+};
+
+static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data)
+{
+       struct __find_variable_param *fvp = data;
+       int tag;
+
+       tag = dwarf_tag(die_mem);
+       if ((tag == DW_TAG_formal_parameter ||
+            tag == DW_TAG_variable) &&
+           die_compare_name(die_mem, fvp->name))
+               return DIE_FIND_CB_END;
+
+       if (dwarf_haspc(die_mem, fvp->addr))
+               return DIE_FIND_CB_CONTINUE;
+       else
+               return DIE_FIND_CB_SIBLING;
+}
+
+/**
+ * die_find_variable_at - Find a given name variable at given address
+ * @sp_die: a function DIE
+ * @name: variable name
+ * @addr: address
+ * @die_mem: a buffer for result DIE
+ *
+ * Find a variable DIE called @name at @addr in @sp_die.
+ */
+Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
+                               Dwarf_Addr addr, Dwarf_Die *die_mem)
+{
+       struct __find_variable_param fvp = { .name = name, .addr = addr};
+
+       return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp,
+                             die_mem);
+}
+
+static int __die_find_member_cb(Dwarf_Die *die_mem, void *data)
+{
+       const char *name = data;
+
+       if ((dwarf_tag(die_mem) == DW_TAG_member) &&
+           die_compare_name(die_mem, name))
+               return DIE_FIND_CB_END;
+
+       return DIE_FIND_CB_SIBLING;
+}
+
+/**
+ * die_find_member - Find a given name member in a data structure
+ * @st_die: a data structure type DIE
+ * @name: member name
+ * @die_mem: a buffer for result DIE
+ *
+ * Find a member DIE called @name in @st_die.
+ */
+Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
+                          Dwarf_Die *die_mem)
+{
+       return die_find_child(st_die, __die_find_member_cb, (void *)name,
+                             die_mem);
+}
+
+/**
+ * die_get_typename - Get the name of given variable DIE
+ * @vr_die: a variable DIE
+ * @buf: a buffer for result type name
+ * @len: a max-length of @buf
+ *
+ * Get the name of @vr_die and stores it to @buf. Return the actual length
+ * of type name if succeeded. Return -E2BIG if @len is not enough long, and
+ * Return -ENOENT if failed to find type name.
+ * Note that the result will stores typedef name if possible, and stores
+ * "*(function_type)" if the type is a function pointer.
+ */
+int die_get_typename(Dwarf_Die *vr_die, char *buf, int len)
+{
+       Dwarf_Die type;
+       int tag, ret, ret2;
+       const char *tmp = "";
+
+       if (__die_get_real_type(vr_die, &type) == NULL)
+               return -ENOENT;
+
+       tag = dwarf_tag(&type);
+       if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)
+               tmp = "*";
+       else if (tag == DW_TAG_subroutine_type) {
+               /* Function pointer */
+               ret = snprintf(buf, len, "(function_type)");
+               return (ret >= len) ? -E2BIG : ret;
+       } else {
+               if (!dwarf_diename(&type))
+                       return -ENOENT;
+               if (tag == DW_TAG_union_type)
+                       tmp = "union ";
+               else if (tag == DW_TAG_structure_type)
+                       tmp = "struct ";
+               /* Write a base name */
+               ret = snprintf(buf, len, "%s%s", tmp, dwarf_diename(&type));
+               return (ret >= len) ? -E2BIG : ret;
+       }
+       ret = die_get_typename(&type, buf, len);
+       if (ret > 0) {
+               ret2 = snprintf(buf + ret, len - ret, "%s", tmp);
+               ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret;
+       }
+       return ret;
+}
+
+/**
+ * die_get_varname - Get the name and type of given variable DIE
+ * @vr_die: a variable DIE
+ * @buf: a buffer for type and variable name
+ * @len: the max-length of @buf
+ *
+ * Get the name and type of @vr_die and stores it in @buf as "type\tname".
+ */
+int die_get_varname(Dwarf_Die *vr_die, char *buf, int len)
+{
+       int ret, ret2;
+
+       ret = die_get_typename(vr_die, buf, len);
+       if (ret < 0) {
+               pr_debug("Failed to get type, make it unknown.\n");
+               ret = snprintf(buf, len, "(unknown_type)");
+       }
+       if (ret > 0) {
+               ret2 = snprintf(buf + ret, len - ret, "\t%s",
+                               dwarf_diename(vr_die));
+               ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret;
+       }
+       return ret;
+}
+
diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
new file mode 100644 (file)
index 0000000..bc3b211
--- /dev/null
@@ -0,0 +1,100 @@
+#ifndef _DWARF_AUX_H
+#define _DWARF_AUX_H
+/*
+ * dwarf-aux.h : libdw auxiliary interfaces
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <dwarf.h>
+#include <elfutils/libdw.h>
+#include <elfutils/libdwfl.h>
+#include <elfutils/version.h>
+
+/* Find the realpath of the target file */
+extern const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname);
+
+/* Get DW_AT_comp_dir (should be NULL with older gcc) */
+extern const char *cu_get_comp_dir(Dwarf_Die *cu_die);
+
+/* Get a line number and file name for given address */
+extern int cu_find_lineinfo(Dwarf_Die *cudie, unsigned long addr,
+                           const char **fname, int *lineno);
+
+/* Compare diename and tname */
+extern bool die_compare_name(Dwarf_Die *dw_die, const char *tname);
+
+/* Get callsite line number of inline-function instance */
+extern int die_get_call_lineno(Dwarf_Die *in_die);
+
+/* Get type die */
+extern Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
+
+/* Get a type die, but skip qualifiers and typedef */
+extern Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
+
+/* Check whether the DIE is signed or not */
+extern bool die_is_signed_type(Dwarf_Die *tp_die);
+
+/* Get data_member_location offset */
+extern int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs);
+
+/* Return values for die_find_child() callbacks */
+enum {
+       DIE_FIND_CB_END = 0,            /* End of Search */
+       DIE_FIND_CB_CHILD = 1,          /* Search only children */
+       DIE_FIND_CB_SIBLING = 2,        /* Search only siblings */
+       DIE_FIND_CB_CONTINUE = 3,       /* Search children and siblings */
+};
+
+/* Search child DIEs */
+extern Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
+                                int (*callback)(Dwarf_Die *, void *),
+                                void *data, Dwarf_Die *die_mem);
+
+/* Search a non-inlined function including given address */
+extern Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
+                                   Dwarf_Die *die_mem);
+
+/* Search an inlined function including given address */
+extern Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
+                                     Dwarf_Die *die_mem);
+
+/* Walker on lines (Note: line number will not be sorted) */
+typedef int (* line_walk_callback_t) (const char *fname, int lineno,
+                                     Dwarf_Addr addr, void *data);
+
+/*
+ * Walk on lines inside given DIE. If the DIE is a subprogram, walk only on
+ * the lines inside the subprogram, otherwise the DIE must be a CU DIE.
+ */
+extern int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback,
+                         void *data);
+
+/* Find a variable called 'name' at given address */
+extern Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
+                                      Dwarf_Addr addr, Dwarf_Die *die_mem);
+
+/* Find a member called 'name' */
+extern Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
+                                 Dwarf_Die *die_mem);
+
+/* Get the name of given variable DIE */
+extern int die_get_typename(Dwarf_Die *vr_die, char *buf, int len);
+
+/* Get the name and type of given variable DIE, stored as "type\tname" */
+extern int die_get_varname(Dwarf_Die *vr_die, char *buf, int len);
+#endif
index d443b64..53d219b 100644 (file)
@@ -222,521 +222,6 @@ static Dwarf *dwfl_init_live_kernel_dwarf(Dwarf_Addr addr __used, Dwfl **dwflp,
 }
 #endif
 
-/* Dwarf wrappers */
-
-/* Find the realpath of the target file. */
-static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname)
-{
-       Dwarf_Files *files;
-       size_t nfiles, i;
-       const char *src = NULL;
-       int ret;
-
-       if (!fname)
-               return NULL;
-
-       ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
-       if (ret != 0)
-               return NULL;
-
-       for (i = 0; i < nfiles; i++) {
-               src = dwarf_filesrc(files, i, NULL, NULL);
-               if (strtailcmp(src, fname) == 0)
-                       break;
-       }
-       if (i == nfiles)
-               return NULL;
-       return src;
-}
-
-/* Get DW_AT_comp_dir (should be NULL with older gcc) */
-static const char *cu_get_comp_dir(Dwarf_Die *cu_die)
-{
-       Dwarf_Attribute attr;
-       if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL)
-               return NULL;
-       return dwarf_formstring(&attr);
-}
-
-/* Get a line number and file name for given address */
-static int cu_find_lineinfo(Dwarf_Die *cudie, unsigned long addr,
-                           const char **fname, int *lineno)
-{
-       Dwarf_Line *line;
-       Dwarf_Addr laddr;
-
-       line = dwarf_getsrc_die(cudie, (Dwarf_Addr)addr);
-       if (line && dwarf_lineaddr(line, &laddr) == 0 &&
-           addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) {
-               *fname = dwarf_linesrc(line, NULL, NULL);
-               if (!*fname)
-                       /* line number is useless without filename */
-                       *lineno = 0;
-       }
-
-       return *lineno ?: -ENOENT;
-}
-
-/* Compare diename and tname */
-static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
-{
-       const char *name;
-       name = dwarf_diename(dw_die);
-       return name ? (strcmp(tname, name) == 0) : false;
-}
-
-/* Get callsite line number of inline-function instance */
-static int die_get_call_lineno(Dwarf_Die *in_die)
-{
-       Dwarf_Attribute attr;
-       Dwarf_Word ret;
-
-       if (!dwarf_attr(in_die, DW_AT_call_line, &attr))
-               return -ENOENT;
-
-       dwarf_formudata(&attr, &ret);
-       return (int)ret;
-}
-
-/* Get type die */
-static Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
-{
-       Dwarf_Attribute attr;
-
-       if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) &&
-           dwarf_formref_die(&attr, die_mem))
-               return die_mem;
-       else
-               return NULL;
-}
-
-/* Get a type die, but skip qualifiers */
-static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
-{
-       int tag;
-
-       do {
-               vr_die = die_get_type(vr_die, die_mem);
-               if (!vr_die)
-                       break;
-               tag = dwarf_tag(vr_die);
-       } while (tag == DW_TAG_const_type ||
-                tag == DW_TAG_restrict_type ||
-                tag == DW_TAG_volatile_type ||
-                tag == DW_TAG_shared_type);
-
-       return vr_die;
-}
-
-/* Get a type die, but skip qualifiers and typedef */
-static Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
-{
-       do {
-               vr_die = __die_get_real_type(vr_die, die_mem);
-       } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef);
-
-       return vr_die;
-}
-
-static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name,
-                             Dwarf_Word *result)
-{
-       Dwarf_Attribute attr;
-
-       if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
-           dwarf_formudata(&attr, result) != 0)
-               return -ENOENT;
-
-       return 0;
-}
-
-static bool die_is_signed_type(Dwarf_Die *tp_die)
-{
-       Dwarf_Word ret;
-
-       if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret))
-               return false;
-
-       return (ret == DW_ATE_signed_char || ret == DW_ATE_signed ||
-               ret == DW_ATE_signed_fixed);
-}
-
-/* Get data_member_location offset */
-static int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs)
-{
-       Dwarf_Attribute attr;
-       Dwarf_Op *expr;
-       size_t nexpr;
-       int ret;
-
-       if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL)
-               return -ENOENT;
-
-       if (dwarf_formudata(&attr, offs) != 0) {
-               /* DW_AT_data_member_location should be DW_OP_plus_uconst */
-               ret = dwarf_getlocation(&attr, &expr, &nexpr);
-               if (ret < 0 || nexpr == 0)
-                       return -ENOENT;
-
-               if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) {
-                       pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n",
-                                expr[0].atom, nexpr);
-                       return -ENOTSUP;
-               }
-               *offs = (Dwarf_Word)expr[0].number;
-       }
-       return 0;
-}
-
-/* Return values for die_find callbacks */
-enum {
-       DIE_FIND_CB_END = 0,            /* End of Search */
-       DIE_FIND_CB_CHILD = 1,          /* Search only children */
-       DIE_FIND_CB_SIBLING = 2,        /* Search only siblings */
-       DIE_FIND_CB_CONTINUE = 3,       /* Search children and siblings */
-};
-
-/* Search a child die */
-static Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
-                                int (*callback)(Dwarf_Die *, void *),
-                                void *data, Dwarf_Die *die_mem)
-{
-       Dwarf_Die child_die;
-       int ret;
-
-       ret = dwarf_child(rt_die, die_mem);
-       if (ret != 0)
-               return NULL;
-
-       do {
-               ret = callback(die_mem, data);
-               if (ret == DIE_FIND_CB_END)
-                       return die_mem;
-
-               if ((ret & DIE_FIND_CB_CHILD) &&
-                   die_find_child(die_mem, callback, data, &child_die)) {
-                       memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
-                       return die_mem;
-               }
-       } while ((ret & DIE_FIND_CB_SIBLING) &&
-                dwarf_siblingof(die_mem, die_mem) == 0);
-
-       return NULL;
-}
-
-struct __addr_die_search_param {
-       Dwarf_Addr      addr;
-       Dwarf_Die       *die_mem;
-};
-
-static int __die_search_func_cb(Dwarf_Die *fn_die, void *data)
-{
-       struct __addr_die_search_param *ad = data;
-
-       if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
-           dwarf_haspc(fn_die, ad->addr)) {
-               memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
-               return DWARF_CB_ABORT;
-       }
-       return DWARF_CB_OK;
-}
-
-/* Search a real subprogram including this line, */
-static Dwarf_Die *die_find_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr,
-                                          Dwarf_Die *die_mem)
-{
-       struct __addr_die_search_param ad;
-       ad.addr = addr;
-       ad.die_mem = die_mem;
-       /* dwarf_getscopes can't find subprogram. */
-       if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0))
-               return NULL;
-       else
-               return die_mem;
-}
-
-/* die_find callback for inline function search */
-static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data)
-{
-       Dwarf_Addr *addr = data;
-
-       if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine &&
-           dwarf_haspc(die_mem, *addr))
-               return DIE_FIND_CB_END;
-
-       return DIE_FIND_CB_CONTINUE;
-}
-
-/* Similar to dwarf_getfuncs, but returns inlined_subroutine if exists. */
-static Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
-                                     Dwarf_Die *die_mem)
-{
-       Dwarf_Die tmp_die;
-
-       sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die);
-       if (!sp_die)
-               return NULL;
-
-       /* Inlined function could be recursive. Trace it until fail */
-       while (sp_die) {
-               memcpy(die_mem, sp_die, sizeof(Dwarf_Die));
-               sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr,
-                                       &tmp_die);
-       }
-
-       return die_mem;
-}
-
-/* Walker on lines (Note: line number will not be sorted) */
-typedef int (* line_walk_handler_t) (const char *fname, int lineno,
-                                    Dwarf_Addr addr, void *data);
-
-struct __line_walk_param {
-       const char *fname;
-       line_walk_handler_t handler;
-       void *data;
-       int retval;
-};
-
-static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data)
-{
-       struct __line_walk_param *lw = data;
-       Dwarf_Addr addr;
-       int lineno;
-
-       if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) {
-               lineno = die_get_call_lineno(in_die);
-               if (lineno > 0 && dwarf_entrypc(in_die, &addr) == 0) {
-                       lw->retval = lw->handler(lw->fname, lineno, addr,
-                                                lw->data);
-                       if (lw->retval != 0)
-                               return DIE_FIND_CB_END;
-               }
-       }
-       return DIE_FIND_CB_SIBLING;
-}
-
-/* Walk on lines of blocks included in given DIE */
-static int __die_walk_funclines(Dwarf_Die *sp_die,
-                               line_walk_handler_t handler, void *data)
-{
-       struct __line_walk_param lw = {
-               .handler = handler,
-               .data = data,
-               .retval = 0,
-       };
-       Dwarf_Die die_mem;
-       Dwarf_Addr addr;
-       int lineno;
-
-       /* Handle function declaration line */
-       lw.fname = dwarf_decl_file(sp_die);
-       if (lw.fname && dwarf_decl_line(sp_die, &lineno) == 0 &&
-           dwarf_entrypc(sp_die, &addr) == 0) {
-               lw.retval = handler(lw.fname, lineno, addr, data);
-               if (lw.retval != 0)
-                       goto done;
-       }
-       die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem);
-done:
-       return lw.retval;
-}
-
-static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data)
-{
-       struct __line_walk_param *lw = data;
-
-       lw->retval = __die_walk_funclines(sp_die, lw->handler, lw->data);
-       if (lw->retval != 0)
-               return DWARF_CB_ABORT;
-
-       return DWARF_CB_OK;
-}
-
-/*
- * Walk on lines inside given PDIE. If the PDIE is subprogram, walk only on
- * the lines inside the subprogram, otherwise PDIE must be a CU DIE.
- */
-static int die_walk_lines(Dwarf_Die *pdie, line_walk_handler_t handler,
-                         void *data)
-{
-       Dwarf_Lines *lines;
-       Dwarf_Line *line;
-       Dwarf_Addr addr;
-       const char *fname;
-       int lineno, ret = 0;
-       Dwarf_Die die_mem, *cu_die;
-       size_t nlines, i;
-
-       /* Get the CU die */
-       if (dwarf_tag(pdie) == DW_TAG_subprogram)
-               cu_die = dwarf_diecu(pdie, &die_mem, NULL, NULL);
-       else
-               cu_die = pdie;
-       if (!cu_die) {
-               pr_debug2("Failed to get CU from subprogram\n");
-               return -EINVAL;
-       }
-
-       /* Get lines list in the CU */
-       if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) {
-               pr_debug2("Failed to get source lines on this CU.\n");
-               return -ENOENT;
-       }
-       pr_debug2("Get %zd lines from this CU\n", nlines);
-
-       /* Walk on the lines on lines list */
-       for (i = 0; i < nlines; i++) {
-               line = dwarf_onesrcline(lines, i);
-               if (line == NULL ||
-                   dwarf_lineno(line, &lineno) != 0 ||
-                   dwarf_lineaddr(line, &addr) != 0) {
-                       pr_debug2("Failed to get line info. "
-                                 "Possible error in debuginfo.\n");
-                       continue;
-               }
-               /* Filter lines based on address */
-               if (pdie != cu_die)
-                       /*
-                        * Address filtering
-                        * The line is included in given function, and
-                        * no inline block includes it.
-                        */
-                       if (!dwarf_haspc(pdie, addr) ||
-                           die_find_inlinefunc(pdie, addr, &die_mem))
-                               continue;
-               /* Get source line */
-               fname = dwarf_linesrc(line, NULL, NULL);
-
-               ret = handler(fname, lineno, addr, data);
-               if (ret != 0)
-                       return ret;
-       }
-
-       /*
-        * Dwarf lines doesn't include function declarations and inlined
-        * subroutines. We have to check functions list or given function.
-        */
-       if (pdie != cu_die)
-               ret = __die_walk_funclines(pdie, handler, data);
-       else {
-               struct __line_walk_param param = {
-                       .handler = handler,
-                       .data = data,
-                       .retval = 0,
-               };
-               dwarf_getfuncs(cu_die, __die_walk_culines_cb, &param, 0);
-               ret = param.retval;
-       }
-
-       return ret;
-}
-
-struct __find_variable_param {
-       const char *name;
-       Dwarf_Addr addr;
-};
-
-static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data)
-{
-       struct __find_variable_param *fvp = data;
-       int tag;
-
-       tag = dwarf_tag(die_mem);
-       if ((tag == DW_TAG_formal_parameter ||
-            tag == DW_TAG_variable) &&
-           die_compare_name(die_mem, fvp->name))
-               return DIE_FIND_CB_END;
-
-       if (dwarf_haspc(die_mem, fvp->addr))
-               return DIE_FIND_CB_CONTINUE;
-       else
-               return DIE_FIND_CB_SIBLING;
-}
-
-/* Find a variable called 'name' at given address */
-static Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
-                                      Dwarf_Addr addr, Dwarf_Die *die_mem)
-{
-       struct __find_variable_param fvp = { .name = name, .addr = addr};
-
-       return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp,
-                             die_mem);
-}
-
-static int __die_find_member_cb(Dwarf_Die *die_mem, void *data)
-{
-       const char *name = data;
-
-       if ((dwarf_tag(die_mem) == DW_TAG_member) &&
-           die_compare_name(die_mem, name))
-               return DIE_FIND_CB_END;
-
-       return DIE_FIND_CB_SIBLING;
-}
-
-/* Find a member called 'name' */
-static Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
-                                 Dwarf_Die *die_mem)
-{
-       return die_find_child(st_die, __die_find_member_cb, (void *)name,
-                             die_mem);
-}
-
-/* Get the name of given variable DIE */
-static int die_get_typename(Dwarf_Die *vr_die, char *buf, int len)
-{
-       Dwarf_Die type;
-       int tag, ret, ret2;
-       const char *tmp = "";
-
-       if (__die_get_real_type(vr_die, &type) == NULL)
-               return -ENOENT;
-
-       tag = dwarf_tag(&type);
-       if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)
-               tmp = "*";
-       else if (tag == DW_TAG_subroutine_type) {
-               /* Function pointer */
-               ret = snprintf(buf, len, "(function_type)");
-               return (ret >= len) ? -E2BIG : ret;
-       } else {
-               if (!dwarf_diename(&type))
-                       return -ENOENT;
-               if (tag == DW_TAG_union_type)
-                       tmp = "union ";
-               else if (tag == DW_TAG_structure_type)
-                       tmp = "struct ";
-               /* Write a base name */
-               ret = snprintf(buf, len, "%s%s", tmp, dwarf_diename(&type));
-               return (ret >= len) ? -E2BIG : ret;
-       }
-       ret = die_get_typename(&type, buf, len);
-       if (ret > 0) {
-               ret2 = snprintf(buf + ret, len - ret, "%s", tmp);
-               ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret;
-       }
-       return ret;
-}
-
-/* Get the name and type of given variable DIE, stored as "type\tname" */
-static int die_get_varname(Dwarf_Die *vr_die, char *buf, int len)
-{
-       int ret, ret2;
-
-       ret = die_get_typename(vr_die, buf, len);
-       if (ret < 0) {
-               pr_debug("Failed to get type, make it unknown.\n");
-               ret = snprintf(buf, len, "(unknown_type)");
-       }
-       if (ret > 0) {
-               ret2 = snprintf(buf + ret, len - ret, "\t%s",
-                               dwarf_diename(vr_die));
-               ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret;
-       }
-       return ret;
-}
-
 /*
  * Probe finder related functions
  */
@@ -1206,8 +691,7 @@ static int call_probe_finder(Dwarf_Die *sp_die, struct probe_finder *pf)
 
        /* If no real subprogram, find a real one */
        if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) {
-               sp_die = die_find_real_subprogram(&pf->cu_die,
-                                                 pf->addr, &die_mem);
+               sp_die = die_find_realfunc(&pf->cu_die, pf->addr, &die_mem);
                if (!sp_die) {
                        pr_warning("Failed to find probe point in any "
                                   "functions.\n");
@@ -1768,7 +1252,7 @@ int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt)
        /* Don't care whether it failed or not */
 
        /* Find a corresponding function (name, baseline and baseaddr) */
-       if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) {
+       if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) {
                /* Get function entry information */
                tmp = dwarf_diename(&spdie);
                if (!tmp ||
index 605730a..0f1ed3d 100644 (file)
@@ -32,11 +32,7 @@ extern int find_line_range(int fd, struct line_range *lr);
 extern int find_available_vars_at(int fd, struct perf_probe_event *pev,
                                  struct variable_list **vls, int max_points,
                                  bool externs);
-
-#include <dwarf.h>
-#include <elfutils/libdw.h>
-#include <elfutils/libdwfl.h>
-#include <elfutils/version.h>
+#include "dwarf-aux.h"
 
 struct probe_finder {
        struct perf_probe_event *pev;           /* Target probe event */