Hi Ingo,
Here are several bugfixes and updates of perf-probe (v3).
This updates includes moving onto elfutils-libdw and
the lazy line matching support which you had mentioned :-)
elfutils library is developed closely with gcc team,
and it is simple and fast dwarf analysis library.
lazy-matching is similar to glob matching but ignoring
spaces in both of target and pattern.
Changes in v3:
- Cast Dwarf_Addr/Dwarf_Word to uintmax_t for printf-formats.
- Recover a sign-prefix which was removed in v2 by mistake.
Changes in v2:
(Fixed bugs on x86-64)
- Fix a type-casting bug in Makefile.
- Cast Dwarf_Addr/Dwarf_Word to unsigned long long for
printf-formats.
This is updated todo list. Most of them are related
to the 'type' support.
Long-term TODOs (future features):
- Enhance probe-finder to decode call frame instructions.
- Support sys_perf_counter_open (for non-root users)
- Support tracing static variables (non global)
- Support variable types from debuginfo (e.g. char, int, ...)
- Support fields of data structures (var->field)
- Support array (var[N])
- Support dynamic array-indexing (var[var2])
- Support string/dynamic arrays (*var, var[N..M])
- Support force type-casting ((type)var)
- Support the type of return value
Miscs:
- Better support for probes on modules
- --list option shows the file-name/line-number of each events.
- More debugger like enhancements(%next, --disasm, etc.)
Thank you,
---
Masami Hiramatsu (9):
perf probe: Add lazy line matching support
perf probe: show more lines after last line
perf probe: Check function address range strictly in line finder
perf probe: Use libdw callback routines
perf probe: Use elfutils-libdw for analyzing debuginfo
perf probe: Rename probe finder functions
perf probe: Fix bugs in line range finder
perf probe: Update perf probe document
perf probe: Do not show --line option without dwarf support
tools/perf/Documentation/perf-probe.txt | 58 ++
tools/perf/Makefile | 10
tools/perf/builtin-probe.c | 36 +
tools/perf/util/probe-event.c | 55 +-
tools/perf/util/probe-finder.c | 1002 ++++++++++++++-----------------
tools/perf/util/probe-finder.h | 53 +-
tools/perf/util/string.c | 55 +-
tools/perf/util/string.h | 1
8 files changed, 644 insertions(+), 626 deletions(-)
--
Masami Hiramatsu
e-mail: [email protected]
Do not show --line option in help message when perf
doesn't support dwarf.
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: K.Prasad <[email protected]>
---
tools/perf/builtin-probe.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index ad47bd4..c7e14d0 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -156,7 +156,9 @@ static const char * const probe_usage[] = {
"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
"perf probe [<options>] --del '[GROUP:]EVENT' ...",
"perf probe --list",
+#ifndef NO_LIBDWARF
"perf probe --line 'LINEDESC'",
+#endif
NULL
};
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: [email protected]
Update perf-probe.txt to suit to current perf-probe command
and add some examples.
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: K.Prasad <[email protected]>
---
tools/perf/Documentation/perf-probe.txt | 28 ++++++++++++++++++++++++++--
1 files changed, 26 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 2de3407..5fe63c0 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -41,7 +41,8 @@ OPTIONS
-d::
--del=::
- Delete a probe event.
+ Delete probe events. This accepts glob wildcards('*', '?') and character
+ classes(e.g. [a-z], [!A-Z]).
-l::
--list::
@@ -50,7 +51,11 @@ OPTIONS
-L::
--line=::
Show source code lines which can be probed. This needs an argument
- which specifies a range of the source code.
+ which specifies a range of the source code. (see LINE SYNTAX for detail)
+
+-f::
+--force::
+ Forcibly add events with existing name.
PROBE SYNTAX
------------
@@ -76,6 +81,25 @@ and 'ALN2' is end line number in the file. It is also possible to specify how
many lines to show by using 'NUM'.
So, "source.c:100-120" shows lines between 100th to l20th in source.c file. And "func:10+20" shows 20 lines from 10th line of func function.
+EXAMPLES
+--------
+Display which lines in schedule() can be probed:
+
+ ./perf probe --line schedule
+
+Add a probe on schedule() function 12th line with recording cpu local variable:
+
+ ./perf probe schedule:12 cpu
+ or
+ ./perf probe --add='schedule:12 cpu'
+
+ this will add one or more probes which has the name start with "schedule".
+
+Delete all probes on schedule().
+
+ ./perf probe --del='schedule*'
+
+
SEE ALSO
--------
linkperf:perf-trace[1], linkperf:perf-record[1]
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: [email protected]
Check (inlined) function address range strictly for
improving output of probe-able lines of inline functions.
Without this change, perf probe --line <function> sometimes
showed other inline function bodies too, because it didn't
filter out inlined functions.
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: K.Prasad <[email protected]>
Cc: Ulrich Drepper <[email protected]>
Cc: Roland McGrath <[email protected]>
---
tools/perf/util/probe-finder.c | 74 +++++++++++++++++++++++++++++-----------
tools/perf/util/probe-finder.h | 2 -
2 files changed, 53 insertions(+), 23 deletions(-)
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 6305f34..a410356 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -161,6 +161,31 @@ static Dwarf_Die *die_get_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr,
return die_mem;
}
+/* Similar to dwarf_getfuncs, but returns inlined_subroutine if exists. */
+static Dwarf_Die *die_get_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_get_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;
+}
+
/* Compare diename and tname */
static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
{
@@ -534,7 +559,7 @@ found:
}
/* Find line range from its line number */
-static void find_line_range_by_line(struct line_finder *lf)
+static void find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
{
Dwarf_Lines *lines;
Dwarf_Line *line;
@@ -543,6 +568,7 @@ static void find_line_range_by_line(struct line_finder *lf)
int lineno;
int ret;
const char *src;
+ Dwarf_Die die_mem;
INIT_LIST_HEAD(&lf->lr->line_list);
ret = dwarf_getsrclines(&lf->cu_die, &lines, &nlines);
@@ -550,22 +576,28 @@ static void find_line_range_by_line(struct line_finder *lf)
for (i = 0; i < nlines; i++) {
line = dwarf_onesrcline(lines, i);
- dwarf_lineno(line, &lineno);
+ ret = dwarf_lineno(line, &lineno);
+ DIE_IF(ret != 0);
if (lf->lno_s > lineno || lf->lno_e < lineno)
continue;
+ if (sp_die) {
+ /* Address filtering 1: does sp_die include addr? */
+ ret = dwarf_lineaddr(line, &addr);
+ DIE_IF(ret != 0);
+ if (!dwarf_haspc(sp_die, addr))
+ continue;
+
+ /* Address filtering 2: No child include addr? */
+ if (die_get_inlinefunc(sp_die, addr, &die_mem))
+ continue;
+ }
+
/* TODO: Get fileno from line, but how? */
src = dwarf_linesrc(line, NULL, NULL);
if (strtailcmp(src, lf->fname) != 0)
continue;
- /* Filter line in the function address range */
- if (lf->addr_s && lf->addr_e) {
- ret = dwarf_lineaddr(line, &addr);
- DIE_IF(ret != 0);
- if (lf->addr_s > addr || lf->addr_e <= addr)
- continue;
- }
/* Copy real path */
if (!lf->lr->path)
lf->lr->path = strdup(src);
@@ -580,24 +612,20 @@ static void find_line_range_by_line(struct line_finder *lf)
}
}
+static int line_range_inline_cb(Dwarf_Die *in_die, void *data)
+{
+ find_line_range_by_line(in_die, (struct line_finder *)data);
+ return DWARF_CB_ABORT; /* No need to find other instances */
+}
+
/* Search function from function name */
static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
{
struct line_finder *lf = (struct line_finder *)data;
struct line_range *lr = lf->lr;
- int ret;
if (dwarf_tag(sp_die) == DW_TAG_subprogram &&
die_compare_name(sp_die, lr->function) == 0) {
- /* Get the address range of this function */
- ret = dwarf_highpc(sp_die, &lf->addr_e);
- if (ret == 0)
- ret = dwarf_lowpc(sp_die, &lf->addr_s);
- if (ret != 0) {
- lf->addr_s = 0;
- lf->addr_e = 0;
- }
-
lf->fname = dwarf_decl_file(sp_die);
dwarf_decl_line(sp_die, &lr->offset);
pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
@@ -608,7 +636,11 @@ static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
lf->lno_e = lr->offset + lr->end;
lr->start = lf->lno_s;
lr->end = lf->lno_e;
- find_line_range_by_line(lf);
+ if (dwarf_func_inline(sp_die))
+ dwarf_func_inline_instances(sp_die,
+ line_range_inline_cb, lf);
+ else
+ find_line_range_by_line(sp_die, lf);
return 1;
}
return 0;
@@ -660,7 +692,7 @@ int find_line_range(int fd, struct line_range *lr)
lf.lno_e = INT_MAX;
else
lf.lno_e = lr->end;
- find_line_range_by_line(&lf);
+ find_line_range_by_line(NULL, &lf);
}
}
off = noff;
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 74525ae..75a660d 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -82,8 +82,6 @@ struct line_finder {
const char *fname; /* File name */
int lno_s; /* Start line number */
int lno_e; /* End line number */
- Dwarf_Addr addr_s; /* Start address */
- Dwarf_Addr addr_e; /* End address */
Dwarf_Die cu_die; /* Current CU */
int found;
};
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: [email protected]
Use libdw callback functions aggressively, and remove
local tree-search API. This change simplifies the code.
Changes in v3:
- Cast Dwarf_Addr to uintmax_t for printf-formats.
Changes in v2:
- Cast Dwarf_Addr to unsigned long long for printf-formats.
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: K.Prasad <[email protected]>
Cc: Ulrich Drepper <[email protected]>
Cc: Roland McGrath <[email protected]>
---
tools/perf/util/probe-finder.c | 262 +++++++++++++---------------------------
tools/perf/util/probe-finder.h | 1
2 files changed, 86 insertions(+), 177 deletions(-)
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index c422472..6305f34 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -38,13 +38,6 @@
#include "probe-finder.h"
-/* Dwarf_Die Linkage to parent Die */
-struct die_link {
- struct die_link *parent; /* Parent die */
- Dwarf_Die die; /* Current die */
-};
-
-
/*
* Generic dwarf analysis helpers
*/
@@ -177,26 +170,6 @@ static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
return strcmp(tname, name);
}
-/* Check the address is in the subprogram(function). */
-static bool die_within_subprogram(Dwarf_Die *sp_die, Dwarf_Addr addr,
- size_t *offs)
-{
- Dwarf_Addr epc;
- int ret;
-
- ret = dwarf_haspc(sp_die, addr);
- if (ret <= 0)
- return false;
-
- if (offs) {
- ret = dwarf_entrypc(sp_die, &epc);
- DIE_IF(ret == -1);
- *offs = addr - epc;
- }
-
- return true;
-}
-
/* Get entry pc(or low pc, 1st entry of ranges) of the die */
static Dwarf_Addr die_get_entrypc(Dwarf_Die *dw_die)
{
@@ -208,70 +181,34 @@ static Dwarf_Addr die_get_entrypc(Dwarf_Die *dw_die)
return epc;
}
-/* Check if the abstract origin's address or not */
-static bool die_compare_abstract_origin(Dwarf_Die *in_die, void *origin_addr)
-{
- Dwarf_Attribute attr;
- Dwarf_Die origin;
-
- if (!dwarf_attr(in_die, DW_AT_abstract_origin, &attr))
- return false;
- if (!dwarf_formref_die(&attr, &origin))
- return false;
-
- return origin.addr == origin_addr;
-}
-
-/*
- * Search a Die from Die tree.
- * Note: cur_link->die should be deallocated in this function.
- */
-static int __search_die_tree(struct die_link *cur_link,
- int (*die_cb)(struct die_link *, void *),
- void *data)
+/* Get a variable die */
+static Dwarf_Die *die_find_variable(Dwarf_Die *sp_die, const char *name,
+ Dwarf_Die *die_mem)
{
- struct die_link new_link;
+ Dwarf_Die child_die;
+ int tag;
int ret;
- if (!die_cb)
- return 0;
-
- /* Check current die */
- while (!(ret = die_cb(cur_link, data))) {
- /* Check child die */
- ret = dwarf_child(&cur_link->die, &new_link.die);
- if (ret == 0) {
- new_link.parent = cur_link;
- ret = __search_die_tree(&new_link, die_cb, data);
- if (ret)
- break;
- }
+ ret = dwarf_child(sp_die, die_mem);
+ if (ret != 0)
+ return NULL;
- /* Move to next sibling */
- ret = dwarf_siblingof(&cur_link->die, &cur_link->die);
- if (ret != 0)
- return 0;
- }
- return ret;
-}
+ 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;
-/* Search a die in its children's die tree */
-static int search_die_from_children(Dwarf_Die *parent_die,
- int (*die_cb)(struct die_link *, void *),
- void *data)
-{
- struct die_link new_link;
- int ret;
+ if (die_find_variable(die_mem, name, &child_die)) {
+ memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
+ return die_mem;
+ }
+ } while (dwarf_siblingof(die_mem, die_mem) == 0);
- new_link.parent = NULL;
- ret = dwarf_child(parent_die, &new_link.die);
- if (ret == 0)
- return __search_die_tree(&new_link, die_cb, data);
- else
- return 0;
+ return NULL;
}
-
/*
* Probe finder related functions
*/
@@ -347,28 +284,13 @@ error:
" Perhaps, it has been optimized out.", pf->var);
}
-static int variable_search_cb(struct die_link *dlink, void *data)
-{
- struct probe_finder *pf = (struct probe_finder *)data;
- int tag;
-
- tag = dwarf_tag(&dlink->die);
- DIE_IF(tag < 0);
- if ((tag == DW_TAG_formal_parameter ||
- tag == DW_TAG_variable) &&
- (die_compare_name(&dlink->die, pf->var) == 0)) {
- show_variable(&dlink->die, pf);
- return 1;
- }
- /* TODO: Support struct members and arrays */
- return 0;
-}
-
/* Find a variable in a subprogram die */
static void find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
{
int ret;
+ Dwarf_Die vr_die;
+ /* TODO: Support struct members and arrays */
if (!is_c_varname(pf->var)) {
/* Output raw parameters */
ret = snprintf(pf->buf, pf->len, " %s", pf->var);
@@ -379,31 +301,42 @@ static void find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
pr_debug("Searching '%s' variable in context.\n", pf->var);
/* Search child die for local variables and parameters. */
- ret = search_die_from_children(sp_die, variable_search_cb, pf);
- if (!ret)
+ if (!die_find_variable(sp_die, pf->var, &vr_die))
die("Failed to find '%s' in this function.", pf->var);
+
+ show_variable(&vr_die, pf);
}
/* Show a probe point to output buffer */
-static void show_probe_point(Dwarf_Die *sp_die, size_t offs,
- struct probe_finder *pf)
+static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
{
struct probe_point *pp = pf->pp;
+ Dwarf_Addr eaddr;
+ Dwarf_Die die_mem;
const char *name;
char tmp[MAX_PROBE_BUFFER];
int ret, i, len;
Dwarf_Attribute fb_attr;
size_t nops;
+ /* If no real subprogram, find a real one */
+ if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) {
+ sp_die = die_get_real_subprogram(&pf->cu_die,
+ pf->addr, &die_mem);
+ if (!sp_die)
+ die("Probe point is not found in subprograms.");
+ }
+
/* Output name of probe point */
name = dwarf_diename(sp_die);
if (name) {
- ret = snprintf(tmp, MAX_PROBE_BUFFER, "%s+%u", name,
- (unsigned int)offs);
+ dwarf_entrypc(sp_die, &eaddr);
+ ret = snprintf(tmp, MAX_PROBE_BUFFER, "%s+%lu", name,
+ (unsigned long)(pf->addr - eaddr));
/* Copy the function name if possible */
if (!pp->function) {
pp->function = strdup(name);
- pp->offset = offs;
+ pp->offset = (size_t)(pf->addr - eaddr);
}
} else {
/* This function has no name. */
@@ -450,10 +383,9 @@ static void find_probe_point_by_line(struct probe_finder *pf)
Dwarf_Lines *lines;
Dwarf_Line *line;
size_t nlines, i;
- Dwarf_Addr addr, epc;
+ Dwarf_Addr addr;
int lineno;
int ret;
- Dwarf_Die *sp_die, die_mem;
ret = dwarf_getsrclines(&pf->cu_die, &lines, &nlines);
DIE_IF(ret != 0);
@@ -474,77 +406,57 @@ static void find_probe_point_by_line(struct probe_finder *pf)
(int)i, lineno, (uintmax_t)addr);
pf->addr = addr;
- sp_die = die_get_real_subprogram(&pf->cu_die, addr, &die_mem);
- if (!sp_die)
- die("Probe point is not found in subprograms.");
- dwarf_entrypc(sp_die, &epc);
- show_probe_point(sp_die, (size_t)(addr - epc), pf);
+ show_probe_point(NULL, pf);
/* Continuing, because target line might be inlined. */
}
}
+static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
+{
+ struct probe_finder *pf = (struct probe_finder *)data;
+ struct probe_point *pp = pf->pp;
+
+ /* Get probe address */
+ pf->addr = die_get_entrypc(in_die);
+ pf->addr += pp->offset;
+ pr_debug("found inline addr: 0x%jx\n", (uintmax_t)pf->addr);
+
+ show_probe_point(in_die, pf);
+ return DWARF_CB_OK;
+}
/* Search function from function name */
-static int probe_point_search_cb(struct die_link *dlink, void *data)
+static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
{
struct probe_finder *pf = (struct probe_finder *)data;
struct probe_point *pp = pf->pp;
- struct die_link *lk;
- size_t offs;
- int tag;
- int ret;
- tag = dwarf_tag(&dlink->die);
- if (tag == DW_TAG_subprogram) {
- if (die_compare_name(&dlink->die, pp->function) == 0) {
- if (pp->line) { /* Function relative line */
- pf->fname = dwarf_decl_file(&dlink->die);
- dwarf_decl_line(&dlink->die, &pf->lno);
- pf->lno += pp->line;
- find_probe_point_by_line(pf);
- return 1;
- }
- if (dwarf_func_inline(&dlink->die)) {
- /* Inlined function, save it. */
- pf->origin = dlink->die.addr;
- return 0; /* Continue to search */
- }
- /* Get probe address */
- pf->addr = die_get_entrypc(&dlink->die);
- pf->addr += pp->offset;
- /* TODO: Check the address in this function */
- show_probe_point(&dlink->die, pp->offset, pf);
- return 1; /* Exit; no same symbol in this CU. */
- }
- } else if (tag == DW_TAG_inlined_subroutine && pf->origin) {
- if (die_compare_abstract_origin(&dlink->die, pf->origin)) {
- /* Get probe address */
- pf->addr = die_get_entrypc(&dlink->die);
- pf->addr += pp->offset;
- pr_debug("found inline addr: 0x%jx\n",
- (uintmax_t)pf->addr);
- /* Inlined function. Get a real subprogram */
- for (lk = dlink->parent; lk != NULL; lk = lk->parent) {
- tag = dwarf_tag(&lk->die);
- if (tag == DW_TAG_subprogram &&
- !dwarf_func_inline(&lk->die))
- goto found;
- }
- die("Failed to find real subprogram.");
-found:
- /* Get offset from subprogram */
- ret = die_within_subprogram(&lk->die, pf->addr, &offs);
- DIE_IF(!ret);
- show_probe_point(&lk->die, offs, pf);
- /* Continue to search */
- }
- }
- return 0;
+ /* Check tag and diename */
+ if (dwarf_tag(sp_die) != DW_TAG_subprogram ||
+ die_compare_name(sp_die, pp->function) != 0)
+ return 0;
+
+ if (pp->line) { /* Function relative line */
+ pf->fname = dwarf_decl_file(sp_die);
+ dwarf_decl_line(sp_die, &pf->lno);
+ pf->lno += pp->line;
+ find_probe_point_by_line(pf);
+ } else if (!dwarf_func_inline(sp_die)) {
+ /* Real function */
+ pf->addr = die_get_entrypc(sp_die);
+ pf->addr += pp->offset;
+ /* TODO: Check the address in this function */
+ show_probe_point(sp_die, pf);
+ } else
+ /* Inlined function: search instances */
+ dwarf_func_inline_instances(sp_die, probe_point_inline_cb, pf);
+
+ return 1; /* Exit; no same symbol in this CU. */
}
static void find_probe_point_by_func(struct probe_finder *pf)
{
- search_die_from_children(&pf->cu_die, probe_point_search_cb, pf);
+ dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, pf, 0);
}
/* Find a probe point */
@@ -669,27 +581,25 @@ static void find_line_range_by_line(struct line_finder *lf)
}
/* Search function from function name */
-static int line_range_search_cb(struct die_link *dlink, void *data)
+static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
{
struct line_finder *lf = (struct line_finder *)data;
struct line_range *lr = lf->lr;
- int tag;
int ret;
- tag = dwarf_tag(&dlink->die);
- if (tag == DW_TAG_subprogram &&
- die_compare_name(&dlink->die, lr->function) == 0) {
+ if (dwarf_tag(sp_die) == DW_TAG_subprogram &&
+ die_compare_name(sp_die, lr->function) == 0) {
/* Get the address range of this function */
- ret = dwarf_highpc(&dlink->die, &lf->addr_e);
+ ret = dwarf_highpc(sp_die, &lf->addr_e);
if (ret == 0)
- ret = dwarf_lowpc(&dlink->die, &lf->addr_s);
+ ret = dwarf_lowpc(sp_die, &lf->addr_s);
if (ret != 0) {
lf->addr_s = 0;
lf->addr_e = 0;
}
- lf->fname = dwarf_decl_file(&dlink->die);
- dwarf_decl_line(&dlink->die, &lr->offset);
+ lf->fname = dwarf_decl_file(sp_die);
+ dwarf_decl_line(sp_die, &lr->offset);
pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
lf->lno_s = lr->offset + lr->start;
if (!lr->end)
@@ -706,7 +616,7 @@ static int line_range_search_cb(struct die_link *dlink, void *data)
static void find_line_range_by_func(struct line_finder *lf)
{
- search_die_from_children(&lf->cu_die, line_range_search_cb, lf);
+ dwarf_getfuncs(&lf->cu_die, line_range_search_cb, lf, 0);
}
int find_line_range(int fd, struct line_range *lr)
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 9dd4a88..74525ae 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -66,7 +66,6 @@ struct probe_finder {
Dwarf_Addr addr; /* Address */
const char *fname; /* File name */
int lno; /* Line number */
- void *origin; /* Inline origin addr */
Dwarf_Die cu_die; /* Current CU */
/* For variable searching */
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: [email protected]
Rename *_probepoint to *_probe_point, for nothing
but a cosmetic reason.
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: K.Prasad <[email protected]>
---
tools/perf/builtin-probe.c | 2 +-
tools/perf/util/probe-finder.c | 12 ++++++------
tools/perf/util/probe-finder.h | 2 +-
3 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index c7e14d0..c3e6119 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -314,7 +314,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
continue;
lseek(fd, SEEK_SET, 0);
- ret = find_probepoint(fd, pp);
+ ret = find_probe_point(fd, pp);
if (ret > 0)
continue;
if (ret == 0) { /* No error but failed to find probe point. */
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 3e10dbe..c819fd5 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -524,8 +524,8 @@ static void free_current_frame_base(struct probe_finder *pf)
}
/* Show a probe point to output buffer */
-static void show_probepoint(Dwarf_Die sp_die, Dwarf_Signed offs,
- struct probe_finder *pf)
+static void show_probe_point(Dwarf_Die sp_die, Dwarf_Signed offs,
+ struct probe_finder *pf)
{
struct probe_point *pp = pf->pp;
char *name;
@@ -585,7 +585,7 @@ static int probeaddr_callback(struct die_link *dlink, void *data)
/* Check the address is in this subprogram */
if (tag == DW_TAG_subprogram &&
die_within_subprogram(dlink->die, pf->addr, &offs)) {
- show_probepoint(dlink->die, offs, pf);
+ show_probe_point(dlink->die, offs, pf);
return 1;
}
return 0;
@@ -668,7 +668,7 @@ static int probefunc_callback(struct die_link *dlink, void *data)
pf->addr = die_get_entrypc(dlink->die);
pf->addr += pp->offset;
/* TODO: Check the address in this function */
- show_probepoint(dlink->die, pp->offset, pf);
+ show_probe_point(dlink->die, pp->offset, pf);
return 1; /* Exit; no same symbol in this CU. */
}
} else if (tag == DW_TAG_inlined_subroutine && pf->inl_offs) {
@@ -691,7 +691,7 @@ found:
/* Get offset from subprogram */
ret = die_within_subprogram(lk->die, pf->addr, &offs);
DIE_IF(!ret);
- show_probepoint(lk->die, offs, pf);
+ show_probe_point(lk->die, offs, pf);
/* Continue to search */
}
}
@@ -704,7 +704,7 @@ static void find_probe_point_by_func(struct probe_finder *pf)
}
/* Find a probe point */
-int find_probepoint(int fd, struct probe_point *pp)
+int find_probe_point(int fd, struct probe_point *pp)
{
Dwarf_Half addr_size = 0;
Dwarf_Unsigned next_cuh = 0;
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 972b386..b2a2524 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -52,7 +52,7 @@ struct line_range {
};
#ifndef NO_LIBDWARF
-extern int find_probepoint(int fd, struct probe_point *pp);
+extern int find_probe_point(int fd, struct probe_point *pp);
extern int find_line_range(int fd, struct line_range *lr);
/* Workaround for undefined _MIPS_SZLONG bug in libdwarf.h: */
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: [email protected]
Newer gcc introduces newer & richer debuginfo, and only libdw
in elfutils project can support it. So perf probe moves onto
elfutils-libdw from libdwarf.
Changes in v3:
- Cast Dwarf_Addr/Dwarf_Word to uintmax_t for printf-formats.
- Recover a sign-prefix which was removed in v2 by mistake.
Changes in v2:
- Fix a type-casting bug in Makefile.
- Cast Dwarf_Addr/Dwarf_Word to unsigned long long for printf-formats.
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: K.Prasad <[email protected]>
Cc: Ulrich Drepper <[email protected]>
Cc: Roland McGrath <[email protected]>
---
tools/perf/Makefile | 10 -
tools/perf/builtin-probe.c | 22 +
tools/perf/util/probe-finder.c | 696 ++++++++++++++++------------------------
tools/perf/util/probe-finder.h | 52 +--
4 files changed, 314 insertions(+), 466 deletions(-)
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 3a5fb36..3b35acc 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -501,12 +501,12 @@ else
msg := $(error No libelf.h/libelf found, please install libelf-dev/elfutils-libelf-devel and glibc-dev[el]);
endif
-ifneq ($(shell sh -c "(echo '\#ifndef _MIPS_SZLONG'; echo '\#define _MIPS_SZLONG 0'; echo '\#endif'; echo '\#include <dwarf.h>'; echo '\#include <libdwarf.h>'; echo 'int main(void) { Dwarf_Debug dbg; Dwarf_Error err; Dwarf_Ranges *rng; dwarf_init(0, DW_DLC_READ, 0, 0, &dbg, &err); dwarf_get_ranges(dbg, 0, &rng, 0, 0, &err); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/libdwarf -ldwarf -lelf -o $(BITBUCKET) $(ALL_LDFLAGS) $(EXTLIBS) "$(QUIET_STDERR)" && echo y"), y)
- msg := $(warning No libdwarf.h found or old libdwarf.h found, disables dwarf support. Please install libdwarf-dev/libdwarf-devel >= 20081231);
- BASIC_CFLAGS += -DNO_LIBDWARF
+ifneq ($(shell sh -c "(echo '\#include <dwarf.h>'; echo '\#include <libdw.h>'; echo 'int main(void) { Dwarf *dbg; dbg = dwarf_begin(0, DWARF_C_READ); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/elfutils -ldw -lelf -o $(BITBUCKET) $(ALL_LDFLAGS) $(EXTLIBS) "$(QUIET_STDERR)" && echo y"), y)
+ msg := $(warning No libdw.h found or old libdw.h found, disables dwarf support. Please install elfutils-devel/elfutils-dev);
+ BASIC_CFLAGS += -DNO_DWARF_SUPPORT
else
- BASIC_CFLAGS += -I/usr/include/libdwarf
- EXTLIBS += -lelf -ldwarf
+ BASIC_CFLAGS += -I/usr/include/elfutils
+ EXTLIBS += -lelf -ldw
LIB_OBJS += util/probe-finder.o
endif
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index c3e6119..d8d3f05 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -128,7 +128,7 @@ static void evaluate_probe_point(struct probe_point *pp)
pp->function);
}
-#ifndef NO_LIBDWARF
+#ifndef NO_DWARF_SUPPORT
static int open_vmlinux(void)
{
if (map__load(session.kmaps[MAP__FUNCTION], NULL) < 0) {
@@ -156,7 +156,7 @@ static const char * const probe_usage[] = {
"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
"perf probe [<options>] --del '[GROUP:]EVENT' ...",
"perf probe --list",
-#ifndef NO_LIBDWARF
+#ifndef NO_DWARF_SUPPORT
"perf probe --line 'LINEDESC'",
#endif
NULL
@@ -165,7 +165,7 @@ static const char * const probe_usage[] = {
static const struct option options[] = {
OPT_BOOLEAN('v', "verbose", &verbose,
"be more verbose (show parsed arguments, etc)"),
-#ifndef NO_LIBDWARF
+#ifndef NO_DWARF_SUPPORT
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
#endif
@@ -174,7 +174,7 @@ static const struct option options[] = {
OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
opt_del_probe_event),
OPT_CALLBACK('a', "add", NULL,
-#ifdef NO_LIBDWARF
+#ifdef NO_DWARF_SUPPORT
"[EVENT=]FUNC[+OFFS|%return] [ARG ...]",
#else
"[EVENT=]FUNC[+OFFS|%return|:RLN][@SRC]|SRC:ALN [ARG ...]",
@@ -185,7 +185,7 @@ static const struct option options[] = {
"\t\tFUNC:\tFunction name\n"
"\t\tOFFS:\tOffset from function entry (in byte)\n"
"\t\t%return:\tPut the probe at function return\n"
-#ifdef NO_LIBDWARF
+#ifdef NO_DWARF_SUPPORT
"\t\tARG:\tProbe argument (only \n"
#else
"\t\tSRC:\tSource code path\n"
@@ -197,7 +197,7 @@ static const struct option options[] = {
opt_add_probe_event),
OPT_BOOLEAN('f', "force", &session.force_add, "forcibly add events"
" with existing name"),
-#ifndef NO_LIBDWARF
+#ifndef NO_DWARF_SUPPORT
OPT_CALLBACK('L', "line", NULL,
"FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]",
"Show source code lines.", opt_show_lines),
@@ -225,7 +225,7 @@ static void init_vmlinux(void)
int cmd_probe(int argc, const char **argv, const char *prefix __used)
{
int i, ret;
-#ifndef NO_LIBDWARF
+#ifndef NO_DWARF_SUPPORT
int fd;
#endif
struct probe_point *pp;
@@ -261,7 +261,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
return 0;
}
-#ifndef NO_LIBDWARF
+#ifndef NO_DWARF_SUPPORT
if (session.show_lines) {
if (session.nr_probe != 0 || session.dellist) {
pr_warning(" Error: Don't use --line with"
@@ -292,9 +292,9 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
init_vmlinux();
if (session.need_dwarf)
-#ifdef NO_LIBDWARF
+#ifdef NO_DWARF_SUPPORT
die("Debuginfo-analysis is not supported");
-#else /* !NO_LIBDWARF */
+#else /* !NO_DWARF_SUPPORT */
pr_debug("Some probes require debuginfo.\n");
fd = open_vmlinux();
@@ -335,7 +335,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
close(fd);
end_dwarf:
-#endif /* !NO_LIBDWARF */
+#endif /* !NO_DWARF_SUPPORT */
/* Synthesize probes without dwarf */
for (i = 0; i < session.nr_probe; i++) {
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index c819fd5..c422472 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -44,8 +44,6 @@ struct die_link {
Dwarf_Die die; /* Current die */
};
-static Dwarf_Debug __dw_debug;
-static Dwarf_Error __dw_error;
/*
* Generic dwarf analysis helpers
@@ -114,157 +112,114 @@ static int strtailcmp(const char *s1, const char *s2)
}
/* Find the fileno of the target file. */
-static Dwarf_Unsigned cu_find_fileno(Dwarf_Die cu_die, const char *fname)
+static int cu_find_fileno(Dwarf_Die *cu_die, const char *fname)
{
- Dwarf_Signed cnt, i;
- Dwarf_Unsigned found = 0;
- char **srcs;
+ Dwarf_Files *files;
+ size_t nfiles, i;
+ const char *src;
int ret;
if (!fname)
- return 0;
+ return -EINVAL;
- ret = dwarf_srcfiles(cu_die, &srcs, &cnt, &__dw_error);
- if (ret == DW_DLV_OK) {
- for (i = 0; i < cnt && !found; i++) {
- if (strtailcmp(srcs[i], fname) == 0)
- found = i + 1;
- dwarf_dealloc(__dw_debug, srcs[i], DW_DLA_STRING);
+ ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
+ if (ret == 0) {
+ for (i = 0; i < nfiles; i++) {
+ src = dwarf_filesrc(files, i, NULL, NULL);
+ if (strtailcmp(src, fname) == 0) {
+ ret = (int)i; /*???: +1 or not?*/
+ break;
+ }
}
- for (; i < cnt; i++)
- dwarf_dealloc(__dw_debug, srcs[i], DW_DLA_STRING);
- dwarf_dealloc(__dw_debug, srcs, DW_DLA_LIST);
+ if (ret)
+ pr_debug("found fno: %d\n", ret);
}
- if (found)
- pr_debug("found fno: %d\n", (int)found);
- return found;
+ return ret;
}
-static int cu_get_filename(Dwarf_Die cu_die, Dwarf_Unsigned fno, char **buf)
+struct __addr_die_search_param {
+ Dwarf_Addr addr;
+ Dwarf_Die *die_mem;
+};
+
+static int __die_search_func_cb(Dwarf_Die *fn_die, void *data)
{
- Dwarf_Signed cnt, i;
- char **srcs;
- int ret = 0;
+ struct __addr_die_search_param *ad = data;
- if (!buf || !fno)
- return -EINVAL;
+ 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;
+}
- ret = dwarf_srcfiles(cu_die, &srcs, &cnt, &__dw_error);
- if (ret == DW_DLV_OK) {
- if ((Dwarf_Unsigned)cnt > fno - 1) {
- *buf = strdup(srcs[fno - 1]);
- ret = 0;
- pr_debug("found filename: %s\n", *buf);
- } else
- ret = -ENOENT;
- for (i = 0; i < cnt; i++)
- dwarf_dealloc(__dw_debug, srcs[i], DW_DLA_STRING);
- dwarf_dealloc(__dw_debug, srcs, DW_DLA_LIST);
- } else
- ret = -EINVAL;
- return ret;
+/* Search a real subprogram including this line, */
+static Dwarf_Die *die_get_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;
}
/* Compare diename and tname */
-static int die_compare_name(Dwarf_Die dw_die, const char *tname)
+static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
{
- char *name;
- int ret;
- ret = dwarf_diename(dw_die, &name, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_OK) {
- ret = strcmp(tname, name);
- dwarf_dealloc(__dw_debug, name, DW_DLA_STRING);
- } else
- ret = -1;
- return ret;
+ const char *name;
+ name = dwarf_diename(dw_die);
+ DIE_IF(name == NULL);
+ return strcmp(tname, name);
}
/* Check the address is in the subprogram(function). */
-static int die_within_subprogram(Dwarf_Die sp_die, Dwarf_Addr addr,
- Dwarf_Signed *offs)
+static bool die_within_subprogram(Dwarf_Die *sp_die, Dwarf_Addr addr,
+ size_t *offs)
{
- Dwarf_Addr lopc, hipc;
+ Dwarf_Addr epc;
int ret;
- /* TODO: check ranges */
- ret = dwarf_lowpc(sp_die, &lopc, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_NO_ENTRY)
- return 0;
- ret = dwarf_highpc(sp_die, &hipc, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- if (lopc <= addr && addr < hipc) {
- *offs = addr - lopc;
- return 1;
- } else
- return 0;
-}
+ ret = dwarf_haspc(sp_die, addr);
+ if (ret <= 0)
+ return false;
-/* Check the die is inlined function */
-static Dwarf_Bool die_inlined_subprogram(Dwarf_Die dw_die)
-{
- /* TODO: check strictly */
- Dwarf_Bool inl;
- int ret;
+ if (offs) {
+ ret = dwarf_entrypc(sp_die, &epc);
+ DIE_IF(ret == -1);
+ *offs = addr - epc;
+ }
- ret = dwarf_hasattr(dw_die, DW_AT_inline, &inl, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- return inl;
+ return true;
}
-/* Get the offset of abstruct_origin */
-static Dwarf_Off die_get_abstract_origin(Dwarf_Die dw_die)
+/* Get entry pc(or low pc, 1st entry of ranges) of the die */
+static Dwarf_Addr die_get_entrypc(Dwarf_Die *dw_die)
{
- Dwarf_Attribute attr;
- Dwarf_Off cu_offs;
+ Dwarf_Addr epc;
int ret;
- ret = dwarf_attr(dw_die, DW_AT_abstract_origin, &attr, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- ret = dwarf_formref(attr, &cu_offs, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
- return cu_offs;
+ ret = dwarf_entrypc(dw_die, &epc);
+ DIE_IF(ret == -1);
+ return epc;
}
-/* Get entry pc(or low pc, 1st entry of ranges) of the die */
-static Dwarf_Addr die_get_entrypc(Dwarf_Die dw_die)
+/* Check if the abstract origin's address or not */
+static bool die_compare_abstract_origin(Dwarf_Die *in_die, void *origin_addr)
{
Dwarf_Attribute attr;
- Dwarf_Addr addr;
- Dwarf_Off offs;
- Dwarf_Ranges *ranges;
- Dwarf_Signed cnt;
- int ret;
+ Dwarf_Die origin;
- /* Try to get entry pc */
- ret = dwarf_attr(dw_die, DW_AT_entry_pc, &attr, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_OK) {
- ret = dwarf_formaddr(attr, &addr, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
- return addr;
- }
+ if (!dwarf_attr(in_die, DW_AT_abstract_origin, &attr))
+ return false;
+ if (!dwarf_formref_die(&attr, &origin))
+ return false;
- /* Try to get low pc */
- ret = dwarf_lowpc(dw_die, &addr, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_OK)
- return addr;
-
- /* Try to get ranges */
- ret = dwarf_attr(dw_die, DW_AT_ranges, &attr, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- ret = dwarf_formref(attr, &offs, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- ret = dwarf_get_ranges(__dw_debug, offs, &ranges, &cnt, NULL,
- &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- addr = ranges[0].dwr_addr1;
- dwarf_ranges_dealloc(__dw_debug, ranges, cnt);
- return addr;
+ return origin.addr == origin_addr;
}
/*
@@ -275,7 +230,6 @@ static int __search_die_tree(struct die_link *cur_link,
int (*die_cb)(struct die_link *, void *),
void *data)
{
- Dwarf_Die new_die;
struct die_link new_link;
int ret;
@@ -285,31 +239,24 @@ static int __search_die_tree(struct die_link *cur_link,
/* Check current die */
while (!(ret = die_cb(cur_link, data))) {
/* Check child die */
- ret = dwarf_child(cur_link->die, &new_die, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_OK) {
+ ret = dwarf_child(&cur_link->die, &new_link.die);
+ if (ret == 0) {
new_link.parent = cur_link;
- new_link.die = new_die;
ret = __search_die_tree(&new_link, die_cb, data);
if (ret)
break;
}
/* Move to next sibling */
- ret = dwarf_siblingof(__dw_debug, cur_link->die, &new_die,
- &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- dwarf_dealloc(__dw_debug, cur_link->die, DW_DLA_DIE);
- cur_link->die = new_die;
- if (ret == DW_DLV_NO_ENTRY)
+ ret = dwarf_siblingof(&cur_link->die, &cur_link->die);
+ if (ret != 0)
return 0;
}
- dwarf_dealloc(__dw_debug, cur_link->die, DW_DLA_DIE);
return ret;
}
/* Search a die in its children's die tree */
-static int search_die_from_children(Dwarf_Die parent_die,
+static int search_die_from_children(Dwarf_Die *parent_die,
int (*die_cb)(struct die_link *, void *),
void *data)
{
@@ -317,125 +264,58 @@ static int search_die_from_children(Dwarf_Die parent_die,
int ret;
new_link.parent = NULL;
- ret = dwarf_child(parent_die, &new_link.die, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_OK)
+ ret = dwarf_child(parent_die, &new_link.die);
+ if (ret == 0)
return __search_die_tree(&new_link, die_cb, data);
else
return 0;
}
-/* Find a locdesc corresponding to the address */
-static int attr_get_locdesc(Dwarf_Attribute attr, Dwarf_Locdesc *desc,
- Dwarf_Addr addr)
-{
- Dwarf_Signed lcnt;
- Dwarf_Locdesc **llbuf;
- int ret, i;
-
- ret = dwarf_loclist_n(attr, &llbuf, &lcnt, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- ret = DW_DLV_NO_ENTRY;
- for (i = 0; i < lcnt; ++i) {
- if (llbuf[i]->ld_lopc <= addr &&
- llbuf[i]->ld_hipc > addr) {
- memcpy(desc, llbuf[i], sizeof(Dwarf_Locdesc));
- desc->ld_s =
- malloc(sizeof(Dwarf_Loc) * llbuf[i]->ld_cents);
- DIE_IF(desc->ld_s == NULL);
- memcpy(desc->ld_s, llbuf[i]->ld_s,
- sizeof(Dwarf_Loc) * llbuf[i]->ld_cents);
- ret = DW_DLV_OK;
- break;
- }
- dwarf_dealloc(__dw_debug, llbuf[i]->ld_s, DW_DLA_LOC_BLOCK);
- dwarf_dealloc(__dw_debug, llbuf[i], DW_DLA_LOCDESC);
- }
- /* Releasing loop */
- for (; i < lcnt; ++i) {
- dwarf_dealloc(__dw_debug, llbuf[i]->ld_s, DW_DLA_LOC_BLOCK);
- dwarf_dealloc(__dw_debug, llbuf[i], DW_DLA_LOCDESC);
- }
- dwarf_dealloc(__dw_debug, llbuf, DW_DLA_LIST);
- return ret;
-}
-
-/* Get decl_file attribute value (file number) */
-static Dwarf_Unsigned die_get_decl_file(Dwarf_Die sp_die)
-{
- Dwarf_Attribute attr;
- Dwarf_Unsigned fno;
- int ret;
-
- ret = dwarf_attr(sp_die, DW_AT_decl_file, &attr, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- dwarf_formudata(attr, &fno, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
- return fno;
-}
-
-/* Get decl_line attribute value (line number) */
-static Dwarf_Unsigned die_get_decl_line(Dwarf_Die sp_die)
-{
- Dwarf_Attribute attr;
- Dwarf_Unsigned lno;
- int ret;
-
- ret = dwarf_attr(sp_die, DW_AT_decl_line, &attr, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- dwarf_formudata(attr, &lno, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
- return lno;
-}
/*
* Probe finder related functions
*/
/* Show a location */
-static void show_location(Dwarf_Loc *loc, struct probe_finder *pf)
+static void show_location(Dwarf_Op *op, struct probe_finder *pf)
{
- Dwarf_Small op;
- Dwarf_Unsigned regn;
- Dwarf_Signed offs;
+ unsigned int regn;
+ Dwarf_Word offs = 0;
int deref = 0, ret;
const char *regs;
- op = loc->lr_atom;
-
+ /* TODO: support CFA */
/* If this is based on frame buffer, set the offset */
- if (op == DW_OP_fbreg) {
+ if (op->atom == DW_OP_fbreg) {
+ if (pf->fb_ops == NULL)
+ die("The attribute of frame base is not supported.\n");
deref = 1;
- offs = (Dwarf_Signed)loc->lr_number;
- op = pf->fbloc.ld_s[0].lr_atom;
- loc = &pf->fbloc.ld_s[0];
- } else
- offs = 0;
+ offs = op->number;
+ op = &pf->fb_ops[0];
+ }
- if (op >= DW_OP_breg0 && op <= DW_OP_breg31) {
- regn = op - DW_OP_breg0;
- offs += (Dwarf_Signed)loc->lr_number;
+ if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) {
+ regn = op->atom - DW_OP_breg0;
+ offs += op->number;
deref = 1;
- } else if (op >= DW_OP_reg0 && op <= DW_OP_reg31) {
- regn = op - DW_OP_reg0;
- } else if (op == DW_OP_bregx) {
- regn = loc->lr_number;
- offs += (Dwarf_Signed)loc->lr_number2;
+ } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) {
+ regn = op->atom - DW_OP_reg0;
+ } else if (op->atom == DW_OP_bregx) {
+ regn = op->number;
+ offs += op->number2;
deref = 1;
- } else if (op == DW_OP_regx) {
- regn = loc->lr_number;
+ } else if (op->atom == DW_OP_regx) {
+ regn = op->number;
} else
- die("Dwarf_OP %d is not supported.", op);
+ die("DW_OP %d is not supported.", op->atom);
regs = get_arch_regstr(regn);
if (!regs)
- die("%lld exceeds max register number.", regn);
+ die("%u exceeds max register number.", regn);
if (deref)
- ret = snprintf(pf->buf, pf->len,
- " %s=%+lld(%s)", pf->var, offs, regs);
+ ret = snprintf(pf->buf, pf->len, " %s=+%ju(%s)",
+ pf->var, (uintmax_t)offs, regs);
else
ret = snprintf(pf->buf, pf->len, " %s=%s", pf->var, regs);
DIE_IF(ret < 0);
@@ -443,41 +323,41 @@ static void show_location(Dwarf_Loc *loc, struct probe_finder *pf)
}
/* Show a variables in kprobe event format */
-static void show_variable(Dwarf_Die vr_die, struct probe_finder *pf)
+static void show_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
{
Dwarf_Attribute attr;
- Dwarf_Locdesc ld;
+ Dwarf_Op *expr;
+ size_t nexpr;
int ret;
- ret = dwarf_attr(vr_die, DW_AT_location, &attr, &__dw_error);
- if (ret != DW_DLV_OK)
+ if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
goto error;
- ret = attr_get_locdesc(attr, &ld, (pf->addr - pf->cu_base));
- if (ret != DW_DLV_OK)
+ /* TODO: handle more than 1 exprs */
+ ret = dwarf_getlocation_addr(&attr, (pf->addr - pf->cu_base),
+ &expr, &nexpr, 1);
+ if (ret <= 0 || nexpr == 0)
goto error;
- /* TODO? */
- DIE_IF(ld.ld_cents != 1);
- show_location(&ld.ld_s[0], pf);
- free(ld.ld_s);
- dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
+
+ show_location(expr, pf);
+ /* *expr will be cached in libdw. Don't free it. */
return ;
error:
+ /* TODO: Support const_value */
die("Failed to find the location of %s at this address.\n"
" Perhaps, it has been optimized out.", pf->var);
}
-static int variable_callback(struct die_link *dlink, void *data)
+static int variable_search_cb(struct die_link *dlink, void *data)
{
struct probe_finder *pf = (struct probe_finder *)data;
- Dwarf_Half tag;
- int ret;
+ int tag;
- ret = dwarf_tag(dlink->die, &tag, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
+ tag = dwarf_tag(&dlink->die);
+ DIE_IF(tag < 0);
if ((tag == DW_TAG_formal_parameter ||
tag == DW_TAG_variable) &&
- (die_compare_name(dlink->die, pf->var) == 0)) {
- show_variable(dlink->die, pf);
+ (die_compare_name(&dlink->die, pf->var) == 0)) {
+ show_variable(&dlink->die, pf);
return 1;
}
/* TODO: Support struct members and arrays */
@@ -485,7 +365,7 @@ static int variable_callback(struct die_link *dlink, void *data)
}
/* Find a variable in a subprogram die */
-static void find_variable(Dwarf_Die sp_die, struct probe_finder *pf)
+static void find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
{
int ret;
@@ -499,43 +379,25 @@ static void find_variable(Dwarf_Die sp_die, struct probe_finder *pf)
pr_debug("Searching '%s' variable in context.\n", pf->var);
/* Search child die for local variables and parameters. */
- ret = search_die_from_children(sp_die, variable_callback, pf);
+ ret = search_die_from_children(sp_die, variable_search_cb, pf);
if (!ret)
die("Failed to find '%s' in this function.", pf->var);
}
-/* Get a frame base on the address */
-static void get_current_frame_base(Dwarf_Die sp_die, struct probe_finder *pf)
-{
- Dwarf_Attribute attr;
- int ret;
-
- ret = dwarf_attr(sp_die, DW_AT_frame_base, &attr, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- ret = attr_get_locdesc(attr, &pf->fbloc, (pf->addr - pf->cu_base));
- DIE_IF(ret != DW_DLV_OK);
- dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
-}
-
-static void free_current_frame_base(struct probe_finder *pf)
-{
- free(pf->fbloc.ld_s);
- memset(&pf->fbloc, 0, sizeof(Dwarf_Locdesc));
-}
-
/* Show a probe point to output buffer */
-static void show_probe_point(Dwarf_Die sp_die, Dwarf_Signed offs,
+static void show_probe_point(Dwarf_Die *sp_die, size_t offs,
struct probe_finder *pf)
{
struct probe_point *pp = pf->pp;
- char *name;
+ const char *name;
char tmp[MAX_PROBE_BUFFER];
int ret, i, len;
+ Dwarf_Attribute fb_attr;
+ size_t nops;
/* Output name of probe point */
- ret = dwarf_diename(sp_die, &name, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_OK) {
+ name = dwarf_diename(sp_die);
+ if (name) {
ret = snprintf(tmp, MAX_PROBE_BUFFER, "%s+%u", name,
(unsigned int)offs);
/* Copy the function name if possible */
@@ -543,14 +405,14 @@ static void show_probe_point(Dwarf_Die sp_die, Dwarf_Signed offs,
pp->function = strdup(name);
pp->offset = offs;
}
- dwarf_dealloc(__dw_debug, name, DW_DLA_STRING);
} else {
/* This function has no name. */
- ret = snprintf(tmp, MAX_PROBE_BUFFER, "0x%llx", pf->addr);
+ ret = snprintf(tmp, MAX_PROBE_BUFFER, "0x%jx",
+ (uintmax_t)pf->addr);
if (!pp->function) {
/* TODO: Use _stext */
pp->function = strdup("");
- pp->offset = (int)pf->addr;
+ pp->offset = (size_t)pf->addr;
}
}
DIE_IF(ret < 0);
@@ -558,8 +420,15 @@ static void show_probe_point(Dwarf_Die sp_die, Dwarf_Signed offs,
len = ret;
pr_debug("Probe point found: %s\n", tmp);
+ /* Get the frame base attribute/ops */
+ dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr);
+ ret = dwarf_getlocation_addr(&fb_attr, (pf->addr - pf->cu_base),
+ &pf->fb_ops, &nops, 1);
+ if (ret <= 0 || nops == 0)
+ pf->fb_ops = NULL;
+
/* Find each argument */
- get_current_frame_base(sp_die, pf);
+ /* TODO: use dwarf_cfi_addrframe */
for (i = 0; i < pp->nr_args; i++) {
pf->var = pp->args[i];
pf->buf = &tmp[len];
@@ -567,131 +436,106 @@ static void show_probe_point(Dwarf_Die sp_die, Dwarf_Signed offs,
find_variable(sp_die, pf);
len += strlen(pf->buf);
}
- free_current_frame_base(pf);
+
+ /* *pf->fb_ops will be cached in libdw. Don't free it. */
+ pf->fb_ops = NULL;
pp->probes[pp->found] = strdup(tmp);
pp->found++;
}
-static int probeaddr_callback(struct die_link *dlink, void *data)
-{
- struct probe_finder *pf = (struct probe_finder *)data;
- Dwarf_Half tag;
- Dwarf_Signed offs;
- int ret;
-
- ret = dwarf_tag(dlink->die, &tag, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- /* Check the address is in this subprogram */
- if (tag == DW_TAG_subprogram &&
- die_within_subprogram(dlink->die, pf->addr, &offs)) {
- show_probe_point(dlink->die, offs, pf);
- return 1;
- }
- return 0;
-}
-
/* Find probe point from its line number */
static void find_probe_point_by_line(struct probe_finder *pf)
{
- Dwarf_Signed cnt, i, clm;
- Dwarf_Line *lines;
- Dwarf_Unsigned lineno = 0;
- Dwarf_Addr addr;
- Dwarf_Unsigned fno;
+ Dwarf_Lines *lines;
+ Dwarf_Line *line;
+ size_t nlines, i;
+ Dwarf_Addr addr, epc;
+ int lineno;
int ret;
+ Dwarf_Die *sp_die, die_mem;
- ret = dwarf_srclines(pf->cu_die, &lines, &cnt, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
-
- for (i = 0; i < cnt; i++) {
- ret = dwarf_line_srcfileno(lines[i], &fno, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- if (fno != pf->fno)
- continue;
+ ret = dwarf_getsrclines(&pf->cu_die, &lines, &nlines);
+ DIE_IF(ret != 0);
- ret = dwarf_lineno(lines[i], &lineno, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
+ for (i = 0; i < nlines; i++) {
+ line = dwarf_onesrcline(lines, i);
+ dwarf_lineno(line, &lineno);
if (lineno != pf->lno)
continue;
- ret = dwarf_lineoff(lines[i], &clm, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
+ /* TODO: Get fileno from line, but how? */
+ if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0)
+ continue;
- ret = dwarf_lineaddr(lines[i], &addr, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- pr_debug("Probe line found: line[%d]:%u,%d addr:0x%llx\n",
- (int)i, (unsigned)lineno, (int)clm, addr);
+ ret = dwarf_lineaddr(line, &addr);
+ DIE_IF(ret != 0);
+ pr_debug("Probe line found: line[%d]:%d addr:0x%jx\n",
+ (int)i, lineno, (uintmax_t)addr);
pf->addr = addr;
- /* Search a real subprogram including this line, */
- ret = search_die_from_children(pf->cu_die,
- probeaddr_callback, pf);
- if (ret == 0)
+
+ sp_die = die_get_real_subprogram(&pf->cu_die, addr, &die_mem);
+ if (!sp_die)
die("Probe point is not found in subprograms.");
+ dwarf_entrypc(sp_die, &epc);
+ show_probe_point(sp_die, (size_t)(addr - epc), pf);
/* Continuing, because target line might be inlined. */
}
- dwarf_srclines_dealloc(__dw_debug, lines, cnt);
}
+
/* Search function from function name */
-static int probefunc_callback(struct die_link *dlink, void *data)
+static int probe_point_search_cb(struct die_link *dlink, void *data)
{
struct probe_finder *pf = (struct probe_finder *)data;
struct probe_point *pp = pf->pp;
struct die_link *lk;
- Dwarf_Signed offs;
- Dwarf_Half tag;
+ size_t offs;
+ int tag;
int ret;
- ret = dwarf_tag(dlink->die, &tag, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
+ tag = dwarf_tag(&dlink->die);
if (tag == DW_TAG_subprogram) {
- if (die_compare_name(dlink->die, pp->function) == 0) {
+ if (die_compare_name(&dlink->die, pp->function) == 0) {
if (pp->line) { /* Function relative line */
- pf->fno = die_get_decl_file(dlink->die);
- pf->lno = die_get_decl_line(dlink->die)
- + pp->line;
+ pf->fname = dwarf_decl_file(&dlink->die);
+ dwarf_decl_line(&dlink->die, &pf->lno);
+ pf->lno += pp->line;
find_probe_point_by_line(pf);
return 1;
}
- if (die_inlined_subprogram(dlink->die)) {
+ if (dwarf_func_inline(&dlink->die)) {
/* Inlined function, save it. */
- ret = dwarf_die_CU_offset(dlink->die,
- &pf->inl_offs,
- &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- pr_debug("inline definition offset %lld\n",
- pf->inl_offs);
+ pf->origin = dlink->die.addr;
return 0; /* Continue to search */
}
/* Get probe address */
- pf->addr = die_get_entrypc(dlink->die);
+ pf->addr = die_get_entrypc(&dlink->die);
pf->addr += pp->offset;
/* TODO: Check the address in this function */
- show_probe_point(dlink->die, pp->offset, pf);
+ show_probe_point(&dlink->die, pp->offset, pf);
return 1; /* Exit; no same symbol in this CU. */
}
- } else if (tag == DW_TAG_inlined_subroutine && pf->inl_offs) {
- if (die_get_abstract_origin(dlink->die) == pf->inl_offs) {
+ } else if (tag == DW_TAG_inlined_subroutine && pf->origin) {
+ if (die_compare_abstract_origin(&dlink->die, pf->origin)) {
/* Get probe address */
- pf->addr = die_get_entrypc(dlink->die);
+ pf->addr = die_get_entrypc(&dlink->die);
pf->addr += pp->offset;
- pr_debug("found inline addr: 0x%llx\n", pf->addr);
+ pr_debug("found inline addr: 0x%jx\n",
+ (uintmax_t)pf->addr);
/* Inlined function. Get a real subprogram */
for (lk = dlink->parent; lk != NULL; lk = lk->parent) {
- tag = 0;
- dwarf_tag(lk->die, &tag, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
+ tag = dwarf_tag(&lk->die);
if (tag == DW_TAG_subprogram &&
- !die_inlined_subprogram(lk->die))
+ !dwarf_func_inline(&lk->die))
goto found;
}
die("Failed to find real subprogram.");
found:
/* Get offset from subprogram */
- ret = die_within_subprogram(lk->die, pf->addr, &offs);
+ ret = die_within_subprogram(&lk->die, pf->addr, &offs);
DIE_IF(!ret);
- show_probe_point(lk->die, offs, pf);
+ show_probe_point(&lk->die, offs, pf);
/* Continue to search */
}
}
@@ -700,43 +544,43 @@ found:
static void find_probe_point_by_func(struct probe_finder *pf)
{
- search_die_from_children(pf->cu_die, probefunc_callback, pf);
+ search_die_from_children(&pf->cu_die, probe_point_search_cb, pf);
}
/* Find a probe point */
int find_probe_point(int fd, struct probe_point *pp)
{
- Dwarf_Half addr_size = 0;
- Dwarf_Unsigned next_cuh = 0;
- int cu_number = 0, ret;
struct probe_finder pf = {.pp = pp};
-
- ret = dwarf_init(fd, DW_DLC_READ, 0, 0, &__dw_debug, &__dw_error);
- if (ret != DW_DLV_OK)
+ int ret;
+ Dwarf_Off off, noff;
+ size_t cuhl;
+ Dwarf_Die *diep;
+ Dwarf *dbg;
+ int fno = 0;
+
+ dbg = dwarf_begin(fd, DWARF_C_READ);
+ if (!dbg)
return -ENOENT;
pp->found = 0;
- while (++cu_number) {
- /* Search CU (Compilation Unit) */
- ret = dwarf_next_cu_header(__dw_debug, NULL, NULL, NULL,
- &addr_size, &next_cuh, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_NO_ENTRY)
- break;
-
+ off = 0;
+ /* Loop on CUs (Compilation Unit) */
+ while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
/* Get the DIE(Debugging Information Entry) of this CU */
- ret = dwarf_siblingof(__dw_debug, 0, &pf.cu_die, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
+ diep = dwarf_offdie(dbg, off + cuhl, &pf.cu_die);
+ if (!diep)
+ continue;
/* Check if target file is included. */
if (pp->file)
- pf.fno = cu_find_fileno(pf.cu_die, pp->file);
+ fno = cu_find_fileno(&pf.cu_die, pp->file);
+ else
+ fno = 0;
- if (!pp->file || pf.fno) {
+ if (!pp->file || fno) {
/* Save CU base address (for frame_base) */
- ret = dwarf_lowpc(pf.cu_die, &pf.cu_base, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_NO_ENTRY)
+ ret = dwarf_lowpc(&pf.cu_die, &pf.cu_base);
+ if (ret != 0)
pf.cu_base = 0;
if (pp->function)
find_probe_point_by_func(&pf);
@@ -745,10 +589,9 @@ int find_probe_point(int fd, struct probe_point *pp)
find_probe_point_by_line(&pf);
}
}
- dwarf_dealloc(__dw_debug, pf.cu_die, DW_DLA_DIE);
+ off = noff;
}
- ret = dwarf_finish(__dw_debug, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
+ dwarf_end(dbg);
return pp->found;
}
@@ -781,69 +624,76 @@ found:
/* Find line range from its line number */
static void find_line_range_by_line(struct line_finder *lf)
{
- Dwarf_Signed cnt, i;
- Dwarf_Line *lines;
- Dwarf_Unsigned lineno = 0;
- Dwarf_Unsigned fno;
+ Dwarf_Lines *lines;
+ Dwarf_Line *line;
+ size_t nlines, i;
Dwarf_Addr addr;
+ int lineno;
int ret;
+ const char *src;
INIT_LIST_HEAD(&lf->lr->line_list);
- ret = dwarf_srclines(lf->cu_die, &lines, &cnt, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
+ ret = dwarf_getsrclines(&lf->cu_die, &lines, &nlines);
+ DIE_IF(ret != 0);
- for (i = 0; i < cnt; i++) {
- ret = dwarf_line_srcfileno(lines[i], &fno, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- if (fno != lf->fno)
+ for (i = 0; i < nlines; i++) {
+ line = dwarf_onesrcline(lines, i);
+ dwarf_lineno(line, &lineno);
+ if (lf->lno_s > lineno || lf->lno_e < lineno)
continue;
- ret = dwarf_lineno(lines[i], &lineno, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
- if (lf->lno_s > lineno || lf->lno_e < lineno)
+ /* TODO: Get fileno from line, but how? */
+ src = dwarf_linesrc(line, NULL, NULL);
+ if (strtailcmp(src, lf->fname) != 0)
continue;
/* Filter line in the function address range */
if (lf->addr_s && lf->addr_e) {
- ret = dwarf_lineaddr(lines[i], &addr, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
+ ret = dwarf_lineaddr(line, &addr);
+ DIE_IF(ret != 0);
if (lf->addr_s > addr || lf->addr_e <= addr)
continue;
}
+ /* Copy real path */
+ if (!lf->lr->path)
+ lf->lr->path = strdup(src);
line_range_add_line(lf->lr, (unsigned int)lineno);
}
- dwarf_srclines_dealloc(__dw_debug, lines, cnt);
+ /* Update status */
if (!list_empty(&lf->lr->line_list))
lf->found = 1;
+ else {
+ free(lf->lr->path);
+ lf->lr->path = NULL;
+ }
}
/* Search function from function name */
-static int linefunc_callback(struct die_link *dlink, void *data)
+static int line_range_search_cb(struct die_link *dlink, void *data)
{
struct line_finder *lf = (struct line_finder *)data;
struct line_range *lr = lf->lr;
- Dwarf_Half tag;
+ int tag;
int ret;
- ret = dwarf_tag(dlink->die, &tag, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
+ tag = dwarf_tag(&dlink->die);
if (tag == DW_TAG_subprogram &&
- die_compare_name(dlink->die, lr->function) == 0) {
+ die_compare_name(&dlink->die, lr->function) == 0) {
/* Get the address range of this function */
- ret = dwarf_highpc(dlink->die, &lf->addr_e, &__dw_error);
- if (ret == DW_DLV_OK)
- ret = dwarf_lowpc(dlink->die, &lf->addr_s, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_NO_ENTRY) {
+ ret = dwarf_highpc(&dlink->die, &lf->addr_e);
+ if (ret == 0)
+ ret = dwarf_lowpc(&dlink->die, &lf->addr_s);
+ if (ret != 0) {
lf->addr_s = 0;
lf->addr_e = 0;
}
- lf->fno = die_get_decl_file(dlink->die);
- lr->offset = die_get_decl_line(dlink->die);;
+ lf->fname = dwarf_decl_file(&dlink->die);
+ dwarf_decl_line(&dlink->die, &lr->offset);
+ pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
lf->lno_s = lr->offset + lr->start;
if (!lr->end)
- lf->lno_e = (Dwarf_Unsigned)-1;
+ lf->lno_e = INT_MAX;
else
lf->lno_e = lr->offset + lr->end;
lr->start = lf->lno_s;
@@ -856,55 +706,57 @@ static int linefunc_callback(struct die_link *dlink, void *data)
static void find_line_range_by_func(struct line_finder *lf)
{
- search_die_from_children(lf->cu_die, linefunc_callback, lf);
+ search_die_from_children(&lf->cu_die, line_range_search_cb, lf);
}
int find_line_range(int fd, struct line_range *lr)
{
- Dwarf_Half addr_size = 0;
- Dwarf_Unsigned next_cuh = 0;
+ struct line_finder lf = {.lr = lr, .found = 0};
int ret;
- struct line_finder lf = {.lr = lr};
-
- ret = dwarf_init(fd, DW_DLC_READ, 0, 0, &__dw_debug, &__dw_error);
- if (ret != DW_DLV_OK)
+ Dwarf_Off off = 0, noff;
+ size_t cuhl;
+ Dwarf_Die *diep;
+ Dwarf *dbg;
+ int fno;
+
+ dbg = dwarf_begin(fd, DWARF_C_READ);
+ if (!dbg)
return -ENOENT;
+ /* Loop on CUs (Compilation Unit) */
while (!lf.found) {
- /* Search CU (Compilation Unit) */
- ret = dwarf_next_cu_header(__dw_debug, NULL, NULL, NULL,
- &addr_size, &next_cuh, &__dw_error);
- DIE_IF(ret == DW_DLV_ERROR);
- if (ret == DW_DLV_NO_ENTRY)
+ ret = dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL);
+ if (ret != 0)
break;
/* Get the DIE(Debugging Information Entry) of this CU */
- ret = dwarf_siblingof(__dw_debug, 0, &lf.cu_die, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
+ diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die);
+ if (!diep)
+ continue;
/* Check if target file is included. */
if (lr->file)
- lf.fno = cu_find_fileno(lf.cu_die, lr->file);
+ fno = cu_find_fileno(&lf.cu_die, lr->file);
+ else
+ fno = 0;
- if (!lr->file || lf.fno) {
+ if (!lr->file || fno) {
if (lr->function)
find_line_range_by_func(&lf);
else {
+ lf.fname = lr->file;
lf.lno_s = lr->start;
if (!lr->end)
- lf.lno_e = (Dwarf_Unsigned)-1;
+ lf.lno_e = INT_MAX;
else
lf.lno_e = lr->end;
find_line_range_by_line(&lf);
}
- /* Get the real file path */
- if (lf.found)
- cu_get_filename(lf.cu_die, lf.fno, &lr->path);
}
- dwarf_dealloc(__dw_debug, lf.cu_die, DW_DLA_DIE);
+ off = noff;
}
- ret = dwarf_finish(__dw_debug, &__dw_error);
- DIE_IF(ret != DW_DLV_OK);
+ pr_debug("path: %lx\n", (unsigned long)lr->path);
+ dwarf_end(dbg);
return lf.found;
}
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index b2a2524..9dd4a88 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -1,6 +1,7 @@
#ifndef _PROBE_FINDER_H
#define _PROBE_FINDER_H
+#include <stdbool.h>
#include "util.h"
#define MAX_PATH_LEN 256
@@ -46,53 +47,48 @@ struct line_range {
char *function; /* Function name */
unsigned int start; /* Start line number */
unsigned int end; /* End line number */
- unsigned int offset; /* Start line offset */
+ int offset; /* Start line offset */
char *path; /* Real path name */
struct list_head line_list; /* Visible lines */
};
-#ifndef NO_LIBDWARF
+#ifndef NO_DWARF_SUPPORT
extern int find_probe_point(int fd, struct probe_point *pp);
extern int find_line_range(int fd, struct line_range *lr);
-/* Workaround for undefined _MIPS_SZLONG bug in libdwarf.h: */
-#ifndef _MIPS_SZLONG
-# define _MIPS_SZLONG 0
-#endif
-
#include <dwarf.h>
-#include <libdwarf.h>
+#include <libdw.h>
struct probe_finder {
- struct probe_point *pp; /* Target probe point */
+ struct probe_point *pp; /* Target probe point */
/* For function searching */
- Dwarf_Addr addr; /* Address */
- Dwarf_Unsigned fno; /* File number */
- Dwarf_Unsigned lno; /* Line number */
- Dwarf_Off inl_offs; /* Inline offset */
- Dwarf_Die cu_die; /* Current CU */
+ Dwarf_Addr addr; /* Address */
+ const char *fname; /* File name */
+ int lno; /* Line number */
+ void *origin; /* Inline origin addr */
+ Dwarf_Die cu_die; /* Current CU */
/* For variable searching */
- Dwarf_Addr cu_base; /* Current CU base address */
- Dwarf_Locdesc fbloc; /* Location of Current Frame Base */
- const char *var; /* Current variable name */
- char *buf; /* Current output buffer */
- int len; /* Length of output buffer */
+ Dwarf_Op *fb_ops; /* Frame base attribute */
+ Dwarf_Addr cu_base; /* Current CU base address */
+ const char *var; /* Current variable name */
+ char *buf; /* Current output buffer */
+ int len; /* Length of output buffer */
};
struct line_finder {
- struct line_range *lr; /* Target line range */
-
- Dwarf_Unsigned fno; /* File number */
- Dwarf_Unsigned lno_s; /* Start line number */
- Dwarf_Unsigned lno_e; /* End line number */
- Dwarf_Addr addr_s; /* Start address */
- Dwarf_Addr addr_e; /* End address */
- Dwarf_Die cu_die; /* Current CU */
+ struct line_range *lr; /* Target line range */
+
+ const char *fname; /* File name */
+ int lno_s; /* Start line number */
+ int lno_e; /* End line number */
+ Dwarf_Addr addr_s; /* Start address */
+ Dwarf_Addr addr_e; /* End address */
+ Dwarf_Die cu_die; /* Current CU */
int found;
};
-#endif /* NO_LIBDWARF */
+#endif /* NO_DWARF_SUPPORT */
#endif /*_PROBE_FINDER_H */
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: [email protected]
Show 2 more lines after the last probe-able line.
This will clearly show the last closed-brace of
inline functions.
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: K.Prasad <[email protected]>
---
tools/perf/util/probe-event.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 01c229b..e7918e2 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -718,6 +718,7 @@ void del_trace_kprobe_events(struct strlist *dellist)
}
#define LINEBUF_SIZE 256
+#define NR_ADDITIONAL_LINES 2
static void show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num)
{
@@ -778,5 +779,11 @@ void show_line_range(struct line_range *lr)
show_one_line(fp, (l++) - lr->offset, false, false);
show_one_line(fp, (l++) - lr->offset, false, true);
}
+
+ if (lr->end == INT_MAX)
+ lr->end = l + NR_ADDITIONAL_LINES;
+ while (l < lr->end && !feof(fp))
+ show_one_line(fp, (l++) - lr->offset, false, false);
+
fclose(fp);
}
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: [email protected]
Add lazy line matching support for specifying new probes.
This also changes the syntax of perf probe a bit. Now
perf probe accepts one of below probe event definitions.
1) Define event based on function name
[EVENT=]FUNC[@SRC][:RLN|+OFF|%return|;PTN] [ARG ...]
2) Define event based on source file with line number
[EVENT=]SRC:ALN [ARG ...]
3) Define event based on source file with lazy pattern
[EVENT=]SRC;PTN [ARG ...]
- New lazy matching pattern(PTN) follows ';' (semicolon). And it
must be put the end of the definition.
- So, @SRC is no longer the part which must be put at the end
of the definition.
Note that ';' (semicolon) can be interpreted as the end of
a command by the shell. This means that you need to quote it.
(anyway you will need to quote the lazy pattern itself too,
because it may contains other sensitive characters, like
'[',']' etc.).
Lazy matching
-------------
The lazy line matching is similar to glob matching except
ignoring spaces in both of pattern and target.
e.g.
'a=*' can matches 'a=b', 'a = b', 'a == b' and so on.
This provides some sort of flexibility and robustness to
probe point definitions against minor code changes.
(for example, actual 10th line of schedule() can be changed
easily by modifying schedule(), but the same line matching
'rq=cpu_rq*' may still exist.)
Changes in v3:
- Cast Dwarf_Addr to uintmax_t for printf-formats.
Changes in v2:
- Cast Dwarf_Addr to unsigned long long for printf-formats.
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: K.Prasad <[email protected]>
---
tools/perf/Documentation/perf-probe.txt | 30 +++-
tools/perf/builtin-probe.c | 12 +
tools/perf/util/probe-event.c | 48 ++++--
tools/perf/util/probe-finder.c | 249 ++++++++++++++++++++++++-------
tools/perf/util/probe-finder.h | 2
tools/perf/util/string.c | 55 +++++--
tools/perf/util/string.h | 1
7 files changed, 298 insertions(+), 99 deletions(-)
diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 5fe63c0..34202b1 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -61,11 +61,19 @@ PROBE SYNTAX
------------
Probe points are defined by following syntax.
- "[EVENT=]FUNC[+OFFS|:RLN|%return][@SRC]|SRC:ALN [ARG ...]"
+ 1) Define event based on function name
+ [EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
+
+ 2) Define event based on source file with line number
+ [EVENT=]SRC:ALN [ARG ...]
+
+ 3) Define event based on source file with lazy pattern
+ [EVENT=]SRC;PTN [ARG ...]
+
'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. Currently, event group name is set as 'probe'.
-'FUNC' specifies a probed function name, and it may have one of the following options; '+OFFS' is the offset from function entry address in bytes, 'RLN' is the relative-line number from function entry line, and '%return' means that it probes function return. In addition, 'SRC' specifies a source file which has that function.
-It is also possible to specify a probe point by the source line number by using 'SRC:ALN' syntax, where 'SRC' is the source file path and 'ALN' is the line number.
+'FUNC' specifies a probed function name, and it may have one of the following options; '+OFFS' is the offset from function entry address in bytes, ':RLN' is the relative-line number from function entry line, and '%return' means that it probes function return. And ';PTN' means lazy matching pattern (see LAZY MATCHING). Note that ';PTN' must be the end of the probe point definition. In addition, '@SRC' specifies a source file which has that function.
+It is also possible to specify a probe point by the source line number or lazy matching by using 'SRC:ALN' or 'SRC;PTN' syntax, where 'SRC' is the source file path, ':ALN' is the line number and ';PTN' is the lazy matching pattern.
'ARG' specifies the arguments of this probe point. You can use the name of local variable, or kprobe-tracer argument format (e.g. $retval, %ax, etc).
LINE SYNTAX
@@ -81,6 +89,16 @@ and 'ALN2' is end line number in the file. It is also possible to specify how
many lines to show by using 'NUM'.
So, "source.c:100-120" shows lines between 100th to l20th in source.c file. And "func:10+20" shows 20 lines from 10th line of func function.
+LAZY MATCHING
+-------------
+ The lazy line matching is similar to glob matching but ignoring spaces in both of pattern and target. So this accepts wildcards('*', '?') and character classes(e.g. [a-z], [!A-Z]).
+
+e.g.
+ 'a=*' can matches 'a=b', 'a = b', 'a == b' and so on.
+
+This provides some sort of flexibility and robustness to probe point definitions against minor code changes. For example, actual 10th line of schedule() can be moved easily by modifying schedule(), but the same line matching 'rq=cpu_rq*' may still exist in the function.)
+
+
EXAMPLES
--------
Display which lines in schedule() can be probed:
@@ -95,6 +113,12 @@ Add a probe on schedule() function 12th line with recording cpu local variable:
this will add one or more probes which has the name start with "schedule".
+ Add probes on lines in schedule() function which calls update_rq_clock().
+
+ ./perf probe 'schedule;update_rq_clock*'
+ or
+ ./perf probe --add='schedule;update_rq_clock*'
+
Delete all probes on schedule().
./perf probe --del='schedule*'
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index d8d3f05..e3dfd0d 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -175,22 +175,24 @@ static const struct option options[] = {
opt_del_probe_event),
OPT_CALLBACK('a', "add", NULL,
#ifdef NO_DWARF_SUPPORT
- "[EVENT=]FUNC[+OFFS|%return] [ARG ...]",
+ "[EVENT=]FUNC[+OFF|%return] [ARG ...]",
#else
- "[EVENT=]FUNC[+OFFS|%return|:RLN][@SRC]|SRC:ALN [ARG ...]",
+ "[EVENT=]FUNC[+OFF|%return|:RL|;PT][@SRC]|SRC:AL|SRC;PT"
+ " [ARG ...]",
#endif
"probe point definition, where\n"
"\t\tGROUP:\tGroup name (optional)\n"
"\t\tEVENT:\tEvent name\n"
"\t\tFUNC:\tFunction name\n"
- "\t\tOFFS:\tOffset from function entry (in byte)\n"
+ "\t\tOFF:\tOffset from function entry (in byte)\n"
"\t\t%return:\tPut the probe at function return\n"
#ifdef NO_DWARF_SUPPORT
"\t\tARG:\tProbe argument (only \n"
#else
"\t\tSRC:\tSource code path\n"
- "\t\tRLN:\tRelative line number from function entry.\n"
- "\t\tALN:\tAbsolute line number in file.\n"
+ "\t\tRL:\tRelative line number from function entry.\n"
+ "\t\tAL:\tAbsolute line number in file.\n"
+ "\t\tPT:\tLazy expression of line code.\n"
"\t\tARG:\tProbe argument (local variable name or\n"
#endif
"\t\t\tkprobe-tracer argument format.)\n",
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index e7918e2..9e5e906 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -119,14 +119,14 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
char c, nc = 0;
/*
* <Syntax>
- * perf probe [EVENT=]SRC:LN
- * perf probe [EVENT=]FUNC[+OFFS|%return][@SRC]
+ * perf probe [EVENT=]SRC[:LN|;PTN]
+ * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
*
* TODO:Group name support
*/
- ptr = strchr(arg, '=');
- if (ptr) { /* Event name */
+ ptr = strpbrk(arg, ";=@+%");
+ if (ptr && *ptr == '=') { /* Event name */
*ptr = '\0';
tmp = ptr + 1;
ptr = strchr(arg, ':');
@@ -139,7 +139,7 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
arg = tmp;
}
- ptr = strpbrk(arg, ":+@%");
+ ptr = strpbrk(arg, ";:+@%");
if (ptr) {
nc = *ptr;
*ptr++ = '\0';
@@ -156,7 +156,11 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
while (ptr) {
arg = ptr;
c = nc;
- ptr = strpbrk(arg, ":+@%");
+ if (c == ';') { /* Lazy pattern must be the last part */
+ pp->lazy_line = strdup(arg);
+ break;
+ }
+ ptr = strpbrk(arg, ";:+@%");
if (ptr) {
nc = *ptr;
*ptr++ = '\0';
@@ -165,13 +169,13 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
case ':': /* Line number */
pp->line = strtoul(arg, &tmp, 0);
if (*tmp != '\0')
- semantic_error("There is non-digit charactor"
- " in line number.");
+ semantic_error("There is non-digit char"
+ " in line number.");
break;
case '+': /* Byte offset from a symbol */
pp->offset = strtoul(arg, &tmp, 0);
if (*tmp != '\0')
- semantic_error("There is non-digit charactor"
+ semantic_error("There is non-digit character"
" in offset.");
break;
case '@': /* File name */
@@ -179,9 +183,6 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
semantic_error("SRC@SRC is not allowed.");
pp->file = strdup(arg);
DIE_IF(pp->file == NULL);
- if (ptr)
- semantic_error("@SRC must be the last "
- "option.");
break;
case '%': /* Probe places */
if (strcmp(arg, "return") == 0) {
@@ -196,11 +197,18 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
}
/* Exclusion check */
+ if (pp->lazy_line && pp->line)
+ semantic_error("Lazy pattern can't be used with line number.");
+
+ if (pp->lazy_line && pp->offset)
+ semantic_error("Lazy pattern can't be used with offset.");
+
if (pp->line && pp->offset)
semantic_error("Offset can't be used with line number.");
- if (!pp->line && pp->file && !pp->function)
- semantic_error("File always requires line number.");
+ if (!pp->line && !pp->lazy_line && pp->file && !pp->function)
+ semantic_error("File always requires line number or "
+ "lazy pattern.");
if (pp->offset && !pp->function)
semantic_error("Offset requires an entry function.");
@@ -208,11 +216,13 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
if (pp->retprobe && !pp->function)
semantic_error("Return probe requires an entry function.");
- if ((pp->offset || pp->line) && pp->retprobe)
- semantic_error("Offset/Line can't be used with return probe.");
+ if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe)
+ semantic_error("Offset/Line/Lazy pattern can't be used with "
+ "return probe.");
- pr_debug("symbol:%s file:%s line:%d offset:%d, return:%d\n",
- pp->function, pp->file, pp->line, pp->offset, pp->retprobe);
+ pr_debug("symbol:%s file:%s line:%d offset:%d return:%d lazy:%s\n",
+ pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
+ pp->lazy_line);
}
/* Parse perf-probe event definition */
@@ -458,6 +468,8 @@ static void clear_probe_point(struct probe_point *pp)
free(pp->function);
if (pp->file)
free(pp->file);
+ if (pp->lazy_line)
+ free(pp->lazy_line);
for (i = 0; i < pp->nr_args; i++)
free(pp->args[i]);
if (pp->args)
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index a410356..e77dc88 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -32,6 +32,7 @@
#include <stdarg.h>
#include <ctype.h>
+#include "string.h"
#include "event.h"
#include "debug.h"
#include "util.h"
@@ -104,8 +105,67 @@ static int strtailcmp(const char *s1, const char *s2)
return 0;
}
-/* Find the fileno of the target file. */
-static int cu_find_fileno(Dwarf_Die *cu_die, const char *fname)
+/* Line number list operations */
+
+/* Add a line to line number list */
+static void line_list__add_line(struct list_head *head, unsigned int line)
+{
+ struct line_node *ln;
+ struct list_head *p;
+
+ /* Reverse search, because new line will be the last one */
+ list_for_each_entry_reverse(ln, head, list) {
+ if (ln->line < line) {
+ p = &ln->list;
+ goto found;
+ } else if (ln->line == line) /* Already exist */
+ return ;
+ }
+ /* List is empty, or the smallest entry */
+ p = head;
+found:
+ pr_debug("line list: add a line %u\n", line);
+ ln = zalloc(sizeof(struct line_node));
+ DIE_IF(ln == NULL);
+ ln->line = line;
+ INIT_LIST_HEAD(&ln->list);
+ list_add(&ln->list, p);
+}
+
+/* Check if the line in line number list */
+static int line_list__has_line(struct list_head *head, unsigned int line)
+{
+ struct line_node *ln;
+
+ /* Reverse search, because new line will be the last one */
+ list_for_each_entry(ln, head, list)
+ if (ln->line == line)
+ return 1;
+
+ return 0;
+}
+
+/* Init line number list */
+static void line_list__init(struct list_head *head)
+{
+ INIT_LIST_HEAD(head);
+}
+
+/* Free line number list */
+static void line_list__free(struct list_head *head)
+{
+ struct line_node *ln;
+ while (!list_empty(head)) {
+ ln = list_first_entry(head, struct line_node, list);
+ list_del(&ln->list);
+ free(ln);
+ }
+}
+
+/* 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;
@@ -113,21 +173,18 @@ static int cu_find_fileno(Dwarf_Die *cu_die, const char *fname)
int ret;
if (!fname)
- return -EINVAL;
+ return NULL;
ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
- if (ret == 0) {
- for (i = 0; i < nfiles; i++) {
- src = dwarf_filesrc(files, i, NULL, NULL);
- if (strtailcmp(src, fname) == 0) {
- ret = (int)i; /*???: +1 or not?*/
- break;
- }
- }
- if (ret)
- pr_debug("found fno: %d\n", ret);
+ if (ret != 0)
+ return NULL;
+
+ for (i = 0; i < nfiles; i++) {
+ src = dwarf_filesrc(files, i, NULL, NULL);
+ if (strtailcmp(src, fname) == 0)
+ break;
}
- return ret;
+ return src;
}
struct __addr_die_search_param {
@@ -436,17 +493,109 @@ static void find_probe_point_by_line(struct probe_finder *pf)
}
}
+/* Find lines which match lazy pattern */
+static int find_lazy_match_lines(struct list_head *head,
+ const char *fname, const char *pat)
+{
+ char *fbuf, *p1, *p2;
+ int fd, line, nlines = 0;
+ struct stat st;
+
+ fd = open(fname, O_RDONLY);
+ if (fd < 0)
+ die("failed to open %s", fname);
+ DIE_IF(fstat(fd, &st) < 0);
+ fbuf = malloc(st.st_size + 2);
+ DIE_IF(fbuf == NULL);
+ DIE_IF(read(fd, fbuf, st.st_size) < 0);
+ close(fd);
+ fbuf[st.st_size] = '\n'; /* Dummy line */
+ fbuf[st.st_size + 1] = '\0';
+ p1 = fbuf;
+ line = 1;
+ while ((p2 = strchr(p1, '\n')) != NULL) {
+ *p2 = '\0';
+ if (strlazymatch(p1, pat)) {
+ line_list__add_line(head, line);
+ nlines++;
+ }
+ line++;
+ p1 = p2 + 1;
+ }
+ free(fbuf);
+ return nlines;
+}
+
+/* Find probe points from lazy pattern */
+static void find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
+{
+ Dwarf_Lines *lines;
+ Dwarf_Line *line;
+ size_t nlines, i;
+ Dwarf_Addr addr;
+ Dwarf_Die die_mem;
+ int lineno;
+ int ret;
+
+ if (list_empty(&pf->lcache)) {
+ /* Matching lazy line pattern */
+ ret = find_lazy_match_lines(&pf->lcache, pf->fname,
+ pf->pp->lazy_line);
+ if (ret <= 0)
+ die("No matched lines found in %s.", pf->fname);
+ }
+
+ ret = dwarf_getsrclines(&pf->cu_die, &lines, &nlines);
+ DIE_IF(ret != 0);
+ for (i = 0; i < nlines; i++) {
+ line = dwarf_onesrcline(lines, i);
+
+ dwarf_lineno(line, &lineno);
+ if (!line_list__has_line(&pf->lcache, lineno))
+ continue;
+
+ /* TODO: Get fileno from line, but how? */
+ if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0)
+ continue;
+
+ ret = dwarf_lineaddr(line, &addr);
+ DIE_IF(ret != 0);
+ if (sp_die) {
+ /* Address filtering 1: does sp_die include addr? */
+ if (!dwarf_haspc(sp_die, addr))
+ continue;
+ /* Address filtering 2: No child include addr? */
+ if (die_get_inlinefunc(sp_die, addr, &die_mem))
+ continue;
+ }
+
+ pr_debug("Probe line found: line[%d]:%d addr:0x%llx\n",
+ (int)i, lineno, (unsigned long long)addr);
+ pf->addr = addr;
+
+ show_probe_point(sp_die, pf);
+ /* Continuing, because target line might be inlined. */
+ }
+ /* TODO: deallocate lines, but how? */
+}
+
static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
{
struct probe_finder *pf = (struct probe_finder *)data;
struct probe_point *pp = pf->pp;
- /* Get probe address */
- pf->addr = die_get_entrypc(in_die);
- pf->addr += pp->offset;
- pr_debug("found inline addr: 0x%jx\n", (uintmax_t)pf->addr);
+ if (pp->lazy_line)
+ find_probe_point_lazy(in_die, pf);
+ else {
+ /* Get probe address */
+ pf->addr = die_get_entrypc(in_die);
+ pf->addr += pp->offset;
+ pr_debug("found inline addr: 0x%jx\n",
+ (uintmax_t)pf->addr);
+
+ show_probe_point(in_die, pf);
+ }
- show_probe_point(in_die, pf);
return DWARF_CB_OK;
}
@@ -461,17 +610,21 @@ static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
die_compare_name(sp_die, pp->function) != 0)
return 0;
+ pf->fname = dwarf_decl_file(sp_die);
if (pp->line) { /* Function relative line */
- pf->fname = dwarf_decl_file(sp_die);
dwarf_decl_line(sp_die, &pf->lno);
pf->lno += pp->line;
find_probe_point_by_line(pf);
} else if (!dwarf_func_inline(sp_die)) {
/* Real function */
- pf->addr = die_get_entrypc(sp_die);
- pf->addr += pp->offset;
- /* TODO: Check the address in this function */
- show_probe_point(sp_die, pf);
+ if (pp->lazy_line)
+ find_probe_point_lazy(sp_die, pf);
+ else {
+ pf->addr = die_get_entrypc(sp_die);
+ pf->addr += pp->offset;
+ /* TODO: Check the address in this function */
+ show_probe_point(sp_die, pf);
+ }
} else
/* Inlined function: search instances */
dwarf_func_inline_instances(sp_die, probe_point_inline_cb, pf);
@@ -493,7 +646,6 @@ int find_probe_point(int fd, struct probe_point *pp)
size_t cuhl;
Dwarf_Die *diep;
Dwarf *dbg;
- int fno = 0;
dbg = dwarf_begin(fd, DWARF_C_READ);
if (!dbg)
@@ -501,6 +653,7 @@ int find_probe_point(int fd, struct probe_point *pp)
pp->found = 0;
off = 0;
+ line_list__init(&pf.lcache);
/* Loop on CUs (Compilation Unit) */
while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
/* Get the DIE(Debugging Information Entry) of this CU */
@@ -510,17 +663,19 @@ int find_probe_point(int fd, struct probe_point *pp)
/* Check if target file is included. */
if (pp->file)
- fno = cu_find_fileno(&pf.cu_die, pp->file);
+ pf.fname = cu_find_realpath(&pf.cu_die, pp->file);
else
- fno = 0;
+ pf.fname = NULL;
- if (!pp->file || fno) {
+ if (!pp->file || pf.fname) {
/* Save CU base address (for frame_base) */
ret = dwarf_lowpc(&pf.cu_die, &pf.cu_base);
if (ret != 0)
pf.cu_base = 0;
if (pp->function)
find_probe_point_by_func(&pf);
+ else if (pp->lazy_line)
+ find_probe_point_lazy(NULL, &pf);
else {
pf.lno = pp->line;
find_probe_point_by_line(&pf);
@@ -528,36 +683,12 @@ int find_probe_point(int fd, struct probe_point *pp)
}
off = noff;
}
+ line_list__free(&pf.lcache);
dwarf_end(dbg);
return pp->found;
}
-
-static void line_range_add_line(struct line_range *lr, unsigned int line)
-{
- struct line_node *ln;
- struct list_head *p;
-
- /* Reverse search, because new line will be the last one */
- list_for_each_entry_reverse(ln, &lr->line_list, list) {
- if (ln->line < line) {
- p = &ln->list;
- goto found;
- } else if (ln->line == line) /* Already exist */
- return ;
- }
- /* List is empty, or the smallest entry */
- p = &lr->line_list;
-found:
- pr_debug("Debug: add a line %u\n", line);
- ln = zalloc(sizeof(struct line_node));
- DIE_IF(ln == NULL);
- ln->line = line;
- INIT_LIST_HEAD(&ln->list);
- list_add(&ln->list, p);
-}
-
/* Find line range from its line number */
static void find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
{
@@ -570,7 +701,7 @@ static void find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
const char *src;
Dwarf_Die die_mem;
- INIT_LIST_HEAD(&lf->lr->line_list);
+ line_list__init(&lf->lr->line_list);
ret = dwarf_getsrclines(&lf->cu_die, &lines, &nlines);
DIE_IF(ret != 0);
@@ -601,7 +732,7 @@ static void find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
/* Copy real path */
if (!lf->lr->path)
lf->lr->path = strdup(src);
- line_range_add_line(lf->lr, (unsigned int)lineno);
+ line_list__add_line(&lf->lr->line_list, (unsigned int)lineno);
}
/* Update status */
if (!list_empty(&lf->lr->line_list))
@@ -659,7 +790,6 @@ int find_line_range(int fd, struct line_range *lr)
size_t cuhl;
Dwarf_Die *diep;
Dwarf *dbg;
- int fno;
dbg = dwarf_begin(fd, DWARF_C_READ);
if (!dbg)
@@ -678,15 +808,14 @@ int find_line_range(int fd, struct line_range *lr)
/* Check if target file is included. */
if (lr->file)
- fno = cu_find_fileno(&lf.cu_die, lr->file);
+ lf.fname = cu_find_realpath(&lf.cu_die, lr->file);
else
- fno = 0;
+ lf.fname = 0;
- if (!lr->file || fno) {
+ if (!lr->file || lf.fname) {
if (lr->function)
find_line_range_by_func(&lf);
else {
- lf.fname = lr->file;
lf.lno_s = lr->start;
if (!lr->end)
lf.lno_e = INT_MAX;
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 75a660d..d1a6517 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -21,6 +21,7 @@ struct probe_point {
/* Inputs */
char *file; /* File name */
int line; /* Line number */
+ char *lazy_line; /* Lazy line pattern */
char *function; /* Function name */
int offset; /* Offset bytes */
@@ -74,6 +75,7 @@ struct probe_finder {
const char *var; /* Current variable name */
char *buf; /* Current output buffer */
int len; /* Length of output buffer */
+ struct list_head lcache; /* Line cache for lazy match */
};
struct line_finder {
diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
index c397d4f..a175949 100644
--- a/tools/perf/util/string.c
+++ b/tools/perf/util/string.c
@@ -265,21 +265,21 @@ error:
return false;
}
-/**
- * strglobmatch - glob expression pattern matching
- * @str: the target string to match
- * @pat: the pattern string to match
- *
- * This returns true if the @str matches @pat. @pat can includes wildcards
- * ('*','?') and character classes ([CHARS], complementation and ranges are
- * also supported). Also, this supports escape character ('\') to use special
- * characters as normal character.
- *
- * Note: if @pat syntax is broken, this always returns false.
- */
-bool strglobmatch(const char *str, const char *pat)
+/* Glob/lazy pattern matching */
+static bool __match_glob(const char *str, const char *pat, bool ignore_space)
{
while (*str && *pat && *pat != '*') {
+ if (ignore_space) {
+ /* Ignore spaces for lazy matching */
+ if (isspace(*str)) {
+ str++;
+ continue;
+ }
+ if (isspace(*pat)) {
+ pat++;
+ continue;
+ }
+ }
if (*pat == '?') { /* Matches any single character */
str++;
pat++;
@@ -308,3 +308,32 @@ bool strglobmatch(const char *str, const char *pat)
return !*str && !*pat;
}
+/**
+ * strglobmatch - glob expression pattern matching
+ * @str: the target string to match
+ * @pat: the pattern string to match
+ *
+ * This returns true if the @str matches @pat. @pat can includes wildcards
+ * ('*','?') and character classes ([CHARS], complementation and ranges are
+ * also supported). Also, this supports escape character ('\') to use special
+ * characters as normal character.
+ *
+ * Note: if @pat syntax is broken, this always returns false.
+ */
+bool strglobmatch(const char *str, const char *pat)
+{
+ return __match_glob(str, pat, false);
+}
+
+/**
+ * strlazymatch - matching pattern strings lazily with glob pattern
+ * @str: the target string to match
+ * @pat: the pattern string to match
+ *
+ * This is similar to strglobmatch, except this ignores spaces in
+ * the target string.
+ */
+bool strlazymatch(const char *str, const char *pat)
+{
+ return __match_glob(str, pat, true);
+}
diff --git a/tools/perf/util/string.h b/tools/perf/util/string.h
index 02ede58..542e44d 100644
--- a/tools/perf/util/string.h
+++ b/tools/perf/util/string.h
@@ -10,6 +10,7 @@ s64 perf_atoll(const char *str);
char **argv_split(const char *str, int *argcp);
void argv_free(char **argv);
bool strglobmatch(const char *str, const char *pat);
+bool strlazymatch(const char *str, const char *pat);
#define _STR(x) #x
#define STR(x) _STR(x)
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: [email protected]
Fix find_line_range_by_line() to init line_list and remove
misconseptional found marking which should be done when
real lines are found (if there is no lines probe-able,
find_line_range() should return 0).
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: K.Prasad <[email protected]>
---
tools/perf/util/probe-finder.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 1b2124d..3e10dbe 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -788,6 +788,7 @@ static void find_line_range_by_line(struct line_finder *lf)
Dwarf_Addr addr;
int ret;
+ INIT_LIST_HEAD(&lf->lr->line_list);
ret = dwarf_srclines(lf->cu_die, &lines, &cnt, &__dw_error);
DIE_IF(ret != DW_DLV_OK);
@@ -848,8 +849,6 @@ static int linefunc_callback(struct die_link *dlink, void *data)
lr->start = lf->lno_s;
lr->end = lf->lno_e;
find_line_range_by_line(lf);
- /* If we find a target function, this should be end. */
- lf->found = 1;
return 1;
}
return 0;
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: [email protected]
> + BASIC_CFLAGS += -I/usr/include/elfutils
The normal method is to use:
#include <elfutils/libdw.h>
Note that <dwarf.h> and <libelf.h> are not in the subdirectory.
Thanks,
Roland
On Tue, 2010-02-23 at 12:49 -0800, Roland McGrath wrote:
> > + BASIC_CFLAGS += -I/usr/include/elfutils
>
> The normal method is to use:
>
> #include <elfutils/libdw.h>
>
> Note that <dwarf.h> and <libelf.h> are not in the subdirectory.
We've had funny issues with distro's being inconsistent in placing those
files, so we chose this route of a direct include and playing games with
the include path to make it work.