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perf probe: Introduce die_find_child() function

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Introduce die_find_child() function to integrate DIE-tree
searching functions.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100316220558.32050.7905.stgit@localhost6.localdomain6>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2010-03-16 18:05:58 -04:00 committed by Ingo Molnar
parent 95a3e4c4e2
commit 016f262e4f
1 changed files with 83 additions and 59 deletions
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134
tools/perf/util/probe-finder.c
View file

@ -186,6 +186,62 @@ static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname)
return src;
}
/* Compare diename and tname */
static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
{
const char *name;
name = dwarf_diename(dw_die);
DIE_IF(name == NULL);
return strcmp(tname, name);
}
/* Get entry pc(or low pc, 1st entry of ranges) of the die */
static Dwarf_Addr die_get_entrypc(Dwarf_Die *dw_die)
{
Dwarf_Addr epc;
int ret;
ret = dwarf_entrypc(dw_die, &epc);
DIE_IF(ret == -1);
return epc;
}
/* Return values for die_find callbacks */
enum {
DIE_FIND_CB_FOUND = 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_FOUND)
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;
@ -217,77 +273,45 @@ static Dwarf_Die *die_find_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr,
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_FOUND;
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 child_die;
int ret;
ret = dwarf_child(sp_die, die_mem);
if (ret != 0)
return NULL;
do {
if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine &&
dwarf_haspc(die_mem, addr))
return die_mem;
if (die_find_inlinefunc(die_mem, addr, &child_die)) {
memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
return die_mem;
}
} while (dwarf_siblingof(die_mem, die_mem) == 0);
return NULL;
return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem);
}
/* Compare diename and tname */
static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data)
{
const char *name;
name = dwarf_diename(dw_die);
DIE_IF(name == NULL);
return strcmp(tname, name);
}
/* Get entry pc(or low pc, 1st entry of ranges) of the die */
static Dwarf_Addr die_get_entrypc(Dwarf_Die *dw_die)
{
Dwarf_Addr epc;
int ret;
ret = dwarf_entrypc(dw_die, &epc);
DIE_IF(ret == -1);
return epc;
}
/* Get a variable die */
static Dwarf_Die *die_find_variable(Dwarf_Die *sp_die, const char *name,
Dwarf_Die *die_mem)
{
Dwarf_Die child_die;
const char *name = data;
int tag;
int ret;
ret = dwarf_child(sp_die, die_mem);
if (ret != 0)
return NULL;
do {
tag = dwarf_tag(die_mem);
if ((tag == DW_TAG_formal_parameter ||
tag == DW_TAG_variable) &&
(die_compare_name(die_mem, name) == 0))
return die_mem;
return DIE_FIND_CB_FOUND;
if (die_find_variable(die_mem, name, &child_die)) {
memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
return die_mem;
return DIE_FIND_CB_CONTINUE;
}
} while (dwarf_siblingof(die_mem, die_mem) == 0);
return NULL;
/* Find a variable called 'name' */
static Dwarf_Die *die_find_variable(Dwarf_Die *sp_die, const char *name,
Dwarf_Die *die_mem)
{
return die_find_child(sp_die, __die_find_variable_cb, (void *)name,
die_mem);
}
/*