diff options
| -rw-r--r-- | tools/perf/Makefile | 10 | ||||
| -rw-r--r-- | tools/perf/builtin-probe.c | 22 | ||||
| -rw-r--r-- | tools/perf/util/probe-finder.c | 696 | ||||
| -rw-r--r-- | 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 54a5b50..2d53738 100644 --- a/tools/perf/Makefile +++ b/tools/perf/Makefile @@ -500,12 +500,12 @@ 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 */ |
