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Diffstat (limited to 'tools/perf/util/probe-finder.c')
-rw-r--r--tools/perf/util/probe-finder.c1860
1 files changed, 1315 insertions, 545 deletions
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 1e6c65ebbd8..98e30476641 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -30,779 +30,1541 @@
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
-#include <ctype.h>
+#include <dwarf-regs.h>
-#include "string.h"
+#include <linux/bitops.h>
#include "event.h"
+#include "dso.h"
#include "debug.h"
+#include "intlist.h"
#include "util.h"
+#include "symbol.h"
#include "probe-finder.h"
+/* Kprobe tracer basic type is up to u64 */
+#define MAX_BASIC_TYPE_BITS 64
-/*
- * Generic dwarf analysis helpers
- */
+/* Dwarf FL wrappers */
+static char *debuginfo_path; /* Currently dummy */
-#define X86_32_MAX_REGS 8
-const char *x86_32_regs_table[X86_32_MAX_REGS] = {
- "%ax",
- "%cx",
- "%dx",
- "%bx",
- "$stack", /* Stack address instead of %sp */
- "%bp",
- "%si",
- "%di",
-};
+static const Dwfl_Callbacks offline_callbacks = {
+ .find_debuginfo = dwfl_standard_find_debuginfo,
+ .debuginfo_path = &debuginfo_path,
-#define X86_64_MAX_REGS 16
-const char *x86_64_regs_table[X86_64_MAX_REGS] = {
- "%ax",
- "%dx",
- "%cx",
- "%bx",
- "%si",
- "%di",
- "%bp",
- "%sp",
- "%r8",
- "%r9",
- "%r10",
- "%r11",
- "%r12",
- "%r13",
- "%r14",
- "%r15",
-};
+ .section_address = dwfl_offline_section_address,
-/* TODO: switching by dwarf address size */
-#ifdef __x86_64__
-#define ARCH_MAX_REGS X86_64_MAX_REGS
-#define arch_regs_table x86_64_regs_table
-#else
-#define ARCH_MAX_REGS X86_32_MAX_REGS
-#define arch_regs_table x86_32_regs_table
-#endif
+ /* We use this table for core files too. */
+ .find_elf = dwfl_build_id_find_elf,
+};
-/* Return architecture dependent register string (for kprobe-tracer) */
-static const char *get_arch_regstr(unsigned int n)
+/* Get a Dwarf from offline image */
+static int debuginfo__init_offline_dwarf(struct debuginfo *dbg,
+ const char *path)
{
- return (n <= ARCH_MAX_REGS) ? arch_regs_table[n] : NULL;
-}
+ int fd;
-/*
- * Compare the tail of two strings.
- * Return 0 if whole of either string is same as another's tail part.
- */
-static int strtailcmp(const char *s1, const char *s2)
-{
- int i1 = strlen(s1);
- int i2 = strlen(s2);
- while (--i1 >= 0 && --i2 >= 0) {
- if (s1[i1] != s2[i2])
- return s1[i1] - s2[i2];
- }
- return 0;
-}
-
-/* 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;
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return fd;
- /* 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);
-}
+ dbg->dwfl = dwfl_begin(&offline_callbacks);
+ if (!dbg->dwfl)
+ goto error;
-/* 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;
+ dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd);
+ if (!dbg->mod)
+ goto error;
- /* Reverse search, because new line will be the last one */
- list_for_each_entry(ln, head, list)
- if (ln->line == line)
- return 1;
+ dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias);
+ if (!dbg->dbg)
+ goto error;
return 0;
-}
+error:
+ if (dbg->dwfl)
+ dwfl_end(dbg->dwfl);
+ else
+ close(fd);
+ memset(dbg, 0, sizeof(*dbg));
-/* Init line number list */
-static void line_list__init(struct list_head *head)
-{
- INIT_LIST_HEAD(head);
+ return -ENOENT;
}
-/* Free line number list */
-static void line_list__free(struct list_head *head)
+static struct debuginfo *__debuginfo__new(const char *path)
{
- 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;
- const char *src = NULL;
- int ret;
-
- if (!fname)
- return NULL;
-
- ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
- if (ret != 0)
+ struct debuginfo *dbg = zalloc(sizeof(*dbg));
+ if (!dbg)
return NULL;
- for (i = 0; i < nfiles; i++) {
- src = dwarf_filesrc(files, i, NULL, NULL);
- if (strtailcmp(src, fname) == 0)
- break;
- }
- return src;
+ if (debuginfo__init_offline_dwarf(dbg, path) < 0)
+ zfree(&dbg);
+ if (dbg)
+ pr_debug("Open Debuginfo file: %s\n", path);
+ return dbg;
}
-struct __addr_die_search_param {
- Dwarf_Addr addr;
- Dwarf_Die *die_mem;
+enum dso_binary_type distro_dwarf_types[] = {
+ DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
+ DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
+ DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
+ DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
+ DSO_BINARY_TYPE__NOT_FOUND,
};
-static int __die_search_func_cb(Dwarf_Die *fn_die, void *data)
+struct debuginfo *debuginfo__new(const char *path)
{
- struct __addr_die_search_param *ad = data;
-
- if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
- dwarf_haspc(fn_die, ad->addr)) {
- memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
- return DWARF_CB_ABORT;
+ enum dso_binary_type *type;
+ char buf[PATH_MAX], nil = '\0';
+ struct dso *dso;
+ struct debuginfo *dinfo = NULL;
+
+ /* Try to open distro debuginfo files */
+ dso = dso__new(path);
+ if (!dso)
+ goto out;
+
+ for (type = distro_dwarf_types;
+ !dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND;
+ type++) {
+ if (dso__read_binary_type_filename(dso, *type, &nil,
+ buf, PATH_MAX) < 0)
+ continue;
+ dinfo = __debuginfo__new(buf);
}
- return DWARF_CB_OK;
-}
-
-/* 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;
-}
-
-/* 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;
+ dso__delete(dso);
- 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;
+out:
+ /* if failed to open all distro debuginfo, open given binary */
+ return dinfo ? : __debuginfo__new(path);
}
-/* Compare diename and tname */
-static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
+void debuginfo__delete(struct debuginfo *dbg)
{
- const char *name;
- name = dwarf_diename(dw_die);
- DIE_IF(name == NULL);
- return strcmp(tname, name);
+ if (dbg) {
+ if (dbg->dwfl)
+ dwfl_end(dbg->dwfl);
+ free(dbg);
+ }
}
-/* Get entry pc(or low pc, 1st entry of ranges) of the die */
-static Dwarf_Addr die_get_entrypc(Dwarf_Die *dw_die)
-{
- Dwarf_Addr epc;
- int ret;
-
- ret = dwarf_entrypc(dw_die, &epc);
- DIE_IF(ret == -1);
- return epc;
-}
+/*
+ * Probe finder related functions
+ */
-/* Get a variable die */
-static Dwarf_Die *die_find_variable(Dwarf_Die *sp_die, const char *name,
- Dwarf_Die *die_mem)
+static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs)
{
- Dwarf_Die child_die;
- int tag;
- int ret;
-
- ret = dwarf_child(sp_die, die_mem);
- if (ret != 0)
- return NULL;
-
- do {
- tag = dwarf_tag(die_mem);
- if ((tag == DW_TAG_formal_parameter ||
- tag == DW_TAG_variable) &&
- (die_compare_name(die_mem, name) == 0))
- return die_mem;
-
- 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);
-
- return NULL;
+ struct probe_trace_arg_ref *ref;
+ ref = zalloc(sizeof(struct probe_trace_arg_ref));
+ if (ref != NULL)
+ ref->offset = offs;
+ return ref;
}
/*
- * Probe finder related functions
+ * Convert a location into trace_arg.
+ * If tvar == NULL, this just checks variable can be converted.
+ * If fentry == true and vr_die is a parameter, do huristic search
+ * for the location fuzzed by function entry mcount.
*/
-
-/* Show a location */
-static void show_location(Dwarf_Op *op, struct probe_finder *pf)
+static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr,
+ Dwarf_Op *fb_ops, Dwarf_Die *sp_die,
+ struct probe_trace_arg *tvar)
{
+ Dwarf_Attribute attr;
+ Dwarf_Addr tmp = 0;
+ Dwarf_Op *op;
+ size_t nops;
unsigned int regn;
Dwarf_Word offs = 0;
- int deref = 0, ret;
+ bool ref = false;
const char *regs;
+ int ret;
+
+ if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL)
+ goto static_var;
+
+ /* TODO: handle more than 1 exprs */
+ if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
+ return -EINVAL; /* Broken DIE ? */
+ if (dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0) {
+ ret = dwarf_entrypc(sp_die, &tmp);
+ if (ret || addr != tmp ||
+ dwarf_tag(vr_die) != DW_TAG_formal_parameter ||
+ dwarf_highpc(sp_die, &tmp))
+ return -ENOENT;
+ /*
+ * This is fuzzed by fentry mcount. We try to find the
+ * parameter location at the earliest address.
+ */
+ for (addr += 1; addr <= tmp; addr++) {
+ if (dwarf_getlocation_addr(&attr, addr, &op,
+ &nops, 1) > 0)
+ goto found;
+ }
+ return -ENOENT;
+ }
+found:
+ if (nops == 0)
+ /* TODO: Support const_value */
+ return -ENOENT;
+
+ if (op->atom == DW_OP_addr) {
+static_var:
+ if (!tvar)
+ return 0;
+ /* Static variables on memory (not stack), make @varname */
+ ret = strlen(dwarf_diename(vr_die));
+ tvar->value = zalloc(ret + 2);
+ if (tvar->value == NULL)
+ return -ENOMEM;
+ snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die));
+ tvar->ref = alloc_trace_arg_ref((long)offs);
+ if (tvar->ref == NULL)
+ return -ENOMEM;
+ return 0;
+ }
- /* TODO: support CFA */
/* If this is based on frame buffer, set the offset */
if (op->atom == DW_OP_fbreg) {
- if (pf->fb_ops == NULL)
- die("The attribute of frame base is not supported.\n");
- deref = 1;
+ if (fb_ops == NULL)
+ return -ENOTSUP;
+ ref = true;
offs = op->number;
- op = &pf->fb_ops[0];
+ op = &fb_ops[0];
}
if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) {
regn = op->atom - DW_OP_breg0;
offs += op->number;
- deref = 1;
+ ref = true;
} 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;
+ ref = true;
} else if (op->atom == DW_OP_regx) {
regn = op->number;
- } else
- die("DW_OP %d is not supported.", op->atom);
+ } else {
+ pr_debug("DW_OP %x is not supported.\n", op->atom);
+ return -ENOTSUP;
+ }
+
+ if (!tvar)
+ return 0;
regs = get_arch_regstr(regn);
- if (!regs)
- die("%u exceeds max register number.", regn);
+ if (!regs) {
+ /* This should be a bug in DWARF or this tool */
+ pr_warning("Mapping for the register number %u "
+ "missing on this architecture.\n", regn);
+ return -ERANGE;
+ }
+
+ tvar->value = strdup(regs);
+ if (tvar->value == NULL)
+ return -ENOMEM;
- if (deref)
- ret = snprintf(pf->buf, pf->len, " %s=+%ju(%s)",
- pf->var, (uintmax_t)offs, regs);
+ if (ref) {
+ tvar->ref = alloc_trace_arg_ref((long)offs);
+ if (tvar->ref == NULL)
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+#define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long))
+
+static int convert_variable_type(Dwarf_Die *vr_die,
+ struct probe_trace_arg *tvar,
+ const char *cast)
+{
+ struct probe_trace_arg_ref **ref_ptr = &tvar->ref;
+ Dwarf_Die type;
+ char buf[16];
+ int bsize, boffs, total;
+ int ret;
+
+ /* TODO: check all types */
+ if (cast && strcmp(cast, "string") != 0) {
+ /* Non string type is OK */
+ tvar->type = strdup(cast);
+ return (tvar->type == NULL) ? -ENOMEM : 0;
+ }
+
+ bsize = dwarf_bitsize(vr_die);
+ if (bsize > 0) {
+ /* This is a bitfield */
+ boffs = dwarf_bitoffset(vr_die);
+ total = dwarf_bytesize(vr_die);
+ if (boffs < 0 || total < 0)
+ return -ENOENT;
+ ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs,
+ BYTES_TO_BITS(total));
+ goto formatted;
+ }
+
+ if (die_get_real_type(vr_die, &type) == NULL) {
+ pr_warning("Failed to get a type information of %s.\n",
+ dwarf_diename(vr_die));
+ return -ENOENT;
+ }
+
+ pr_debug("%s type is %s.\n",
+ dwarf_diename(vr_die), dwarf_diename(&type));
+
+ if (cast && strcmp(cast, "string") == 0) { /* String type */
+ ret = dwarf_tag(&type);
+ if (ret != DW_TAG_pointer_type &&
+ ret != DW_TAG_array_type) {
+ pr_warning("Failed to cast into string: "
+ "%s(%s) is not a pointer nor array.\n",
+ dwarf_diename(vr_die), dwarf_diename(&type));
+ return -EINVAL;
+ }
+ if (die_get_real_type(&type, &type) == NULL) {
+ pr_warning("Failed to get a type"
+ " information.\n");
+ return -ENOENT;
+ }
+ if (ret == DW_TAG_pointer_type) {
+ while (*ref_ptr)
+ ref_ptr = &(*ref_ptr)->next;
+ /* Add new reference with offset +0 */
+ *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref));
+ if (*ref_ptr == NULL) {
+ pr_warning("Out of memory error\n");
+ return -ENOMEM;
+ }
+ }
+ if (!die_compare_name(&type, "char") &&
+ !die_compare_name(&type, "unsigned char")) {
+ pr_warning("Failed to cast into string: "
+ "%s is not (unsigned) char *.\n",
+ dwarf_diename(vr_die));
+ return -EINVAL;
+ }
+ tvar->type = strdup(cast);
+ return (tvar->type == NULL) ? -ENOMEM : 0;
+ }
+
+ ret = dwarf_bytesize(&type);
+ if (ret <= 0)
+ /* No size ... try to use default type */
+ return 0;
+ ret = BYTES_TO_BITS(ret);
+
+ /* Check the bitwidth */
+ if (ret > MAX_BASIC_TYPE_BITS) {
+ pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n",
+ dwarf_diename(&type), MAX_BASIC_TYPE_BITS);
+ ret = MAX_BASIC_TYPE_BITS;
+ }
+ ret = snprintf(buf, 16, "%c%d",
+ die_is_signed_type(&type) ? 's' : 'u', ret);
+
+formatted:
+ if (ret < 0 || ret >= 16) {
+ if (ret >= 16)
+ ret = -E2BIG;
+ pr_warning("Failed to convert variable type: %s\n",
+ strerror(-ret));
+ return ret;
+ }
+ tvar->type = strdup(buf);
+ if (tvar->type == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
+ struct perf_probe_arg_field *field,
+ struct probe_trace_arg_ref **ref_ptr,
+ Dwarf_Die *die_mem)
+{
+ struct probe_trace_arg_ref *ref = *ref_ptr;
+ Dwarf_Die type;
+ Dwarf_Word offs;
+ int ret, tag;
+
+ pr_debug("converting %s in %s\n", field->name, varname);
+ if (die_get_real_type(vr_die, &type) == NULL) {
+ pr_warning("Failed to get the type of %s.\n", varname);
+ return -ENOENT;
+ }
+ pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type));
+ tag = dwarf_tag(&type);
+
+ if (field->name[0] == '[' &&
+ (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) {
+ if (field->next)
+ /* Save original type for next field */
+ memcpy(die_mem, &type, sizeof(*die_mem));
+ /* Get the type of this array */
+ if (die_get_real_type(&type, &type) == NULL) {
+ pr_warning("Failed to get the type of %s.\n", varname);
+ return -ENOENT;
+ }
+ pr_debug2("Array real type: (%x)\n",
+ (unsigned)dwarf_dieoffset(&type));
+ if (tag == DW_TAG_pointer_type) {
+ ref = zalloc(sizeof(struct probe_trace_arg_ref));
+ if (ref == NULL)
+ return -ENOMEM;
+ if (*ref_ptr)
+ (*ref_ptr)->next = ref;
+ else
+ *ref_ptr = ref;
+ }
+ ref->offset += dwarf_bytesize(&type) * field->index;
+ if (!field->next)
+ /* Save vr_die for converting types */
+ memcpy(die_mem, vr_die, sizeof(*die_mem));
+ goto next;
+ } else if (tag == DW_TAG_pointer_type) {
+ /* Check the pointer and dereference */
+ if (!field->ref) {
+ pr_err("Semantic error: %s must be referred by '->'\n",
+ field->name);
+ return -EINVAL;
+ }
+ /* Get the type pointed by this pointer */
+ if (die_get_real_type(&type, &type) == NULL) {
+ pr_warning("Failed to get the type of %s.\n", varname);
+ return -ENOENT;
+ }
+ /* Verify it is a data structure */
+ tag = dwarf_tag(&type);
+ if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
+ pr_warning("%s is not a data structure nor an union.\n",
+ varname);
+ return -EINVAL;
+ }
+
+ ref = zalloc(sizeof(struct probe_trace_arg_ref));
+ if (ref == NULL)
+ return -ENOMEM;
+ if (*ref_ptr)
+ (*ref_ptr)->next = ref;
+ else
+ *ref_ptr = ref;
+ } else {
+ /* Verify it is a data structure */
+ if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
+ pr_warning("%s is not a data structure nor an union.\n",
+ varname);
+ return -EINVAL;
+ }
+ if (field->name[0] == '[') {
+ pr_err("Semantic error: %s is not a pointor"
+ " nor array.\n", varname);
+ return -EINVAL;
+ }
+ if (field->ref) {
+ pr_err("Semantic error: %s must be referred by '.'\n",
+ field->name);
+ return -EINVAL;
+ }
+ if (!ref) {
+ pr_warning("Structure on a register is not "
+ "supported yet.\n");
+ return -ENOTSUP;
+ }
+ }
+
+ if (die_find_member(&type, field->name, die_mem) == NULL) {
+ pr_warning("%s(type:%s) has no member %s.\n", varname,
+ dwarf_diename(&type), field->name);
+ return -EINVAL;
+ }
+
+ /* Get the offset of the field */
+ if (tag == DW_TAG_union_type) {
+ offs = 0;
+ } else {
+ ret = die_get_data_member_location(die_mem, &offs);
+ if (ret < 0) {
+ pr_warning("Failed to get the offset of %s.\n",
+ field->name);
+ return ret;
+ }
+ }
+ ref->offset += (long)offs;
+
+next:
+ /* Converting next field */
+ if (field->next)
+ return convert_variable_fields(die_mem, field->name,
+ field->next, &ref, die_mem);
else
- ret = snprintf(pf->buf, pf->len, " %s=%s", pf->var, regs);
- DIE_IF(ret < 0);
- DIE_IF(ret >= pf->len);
+ return 0;
}
/* Show a variables in kprobe event format */
-static void show_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
+static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
{
- Dwarf_Attribute attr;
- Dwarf_Op *expr;
- size_t nexpr;
+ Dwarf_Die die_mem;
int ret;
- if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
- goto error;
- /* 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;
-
- show_location(expr, pf);
+ pr_debug("Converting variable %s into trace event.\n",
+ dwarf_diename(vr_die));
+
+ ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops,
+ &pf->sp_die, pf->tvar);
+ if (ret == -ENOENT || ret == -EINVAL)
+ pr_err("Failed to find the location of %s at this address.\n"
+ " Perhaps, it has been optimized out.\n", pf->pvar->var);
+ else if (ret == -ENOTSUP)
+ pr_err("Sorry, we don't support this variable location yet.\n");
+ else if (ret == 0 && pf->pvar->field) {
+ ret = convert_variable_fields(vr_die, pf->pvar->var,
+ pf->pvar->field, &pf->tvar->ref,
+ &die_mem);
+ vr_die = &die_mem;
+ }
+ if (ret == 0)
+ ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type);
/* *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);
+ return ret;
}
-/* Find a variable in a subprogram die */
-static void find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
+/* Find a variable in a scope DIE */
+static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
{
- int ret;
Dwarf_Die vr_die;
+ char buf[32], *ptr;
+ int ret = 0;
+
+ if (!is_c_varname(pf->pvar->var)) {
+ /* Copy raw parameters */
+ pf->tvar->value = strdup(pf->pvar->var);
+ if (pf->tvar->value == NULL)
+ return -ENOMEM;
+ if (pf->pvar->type) {
+ pf->tvar->type = strdup(pf->pvar->type);
+ if (pf->tvar->type == NULL)
+ return -ENOMEM;
+ }
+ if (pf->pvar->name) {
+ pf->tvar->name = strdup(pf->pvar->name);
+ if (pf->tvar->name == NULL)
+ return -ENOMEM;
+ } else
+ pf->tvar->name = NULL;
+ return 0;
+ }
- /* TODO: Support struct members and arrays */
- if (!is_c_varname(pf->var)) {
- /* Output raw parameters */
- ret = snprintf(pf->buf, pf->len, " %s", pf->var);
- DIE_IF(ret < 0);
- DIE_IF(ret >= pf->len);
- return ;
+ if (pf->pvar->name)
+ pf->tvar->name = strdup(pf->pvar->name);
+ else {
+ ret = synthesize_perf_probe_arg(pf->pvar, buf, 32);
+ if (ret < 0)
+ return ret;
+ ptr = strchr(buf, ':'); /* Change type separator to _ */
+ if (ptr)
+ *ptr = '_';
+ pf->tvar->name = strdup(buf);
}
+ if (pf->tvar->name == NULL)
+ return -ENOMEM;
- pr_debug("Searching '%s' variable in context.\n", pf->var);
+ pr_debug("Searching '%s' variable in context.\n", pf->pvar->var);
/* Search child die for local variables and parameters. */
- if (!die_find_variable(sp_die, pf->var, &vr_die))
- die("Failed to find '%s' in this function.", pf->var);
+ if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) {
+ /* Search again in global variables */
+ if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die))
+ pr_warning("Failed to find '%s' in this function.\n",
+ pf->pvar->var);
+ ret = -ENOENT;
+ }
+ if (ret >= 0)
+ ret = convert_variable(&vr_die, pf);
- show_variable(&vr_die, pf);
+ return ret;
}
-/* Show a probe point to output buffer */
-static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
+/* Convert subprogram DIE to trace point */
+static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod,
+ Dwarf_Addr paddr, bool retprobe,
+ struct probe_trace_point *tp)
+{
+ Dwarf_Addr eaddr, highaddr;
+ GElf_Sym sym;
+ const char *symbol;
+
+ /* Verify the address is correct */
+ if (dwarf_entrypc(sp_die, &eaddr) != 0) {
+ pr_warning("Failed to get entry address of %s\n",
+ dwarf_diename(sp_die));
+ return -ENOENT;
+ }
+ if (dwarf_highpc(sp_die, &highaddr) != 0) {
+ pr_warning("Failed to get end address of %s\n",
+ dwarf_diename(sp_die));
+ return -ENOENT;
+ }
+ if (paddr > highaddr) {
+ pr_warning("Offset specified is greater than size of %s\n",
+ dwarf_diename(sp_die));
+ return -EINVAL;
+ }
+
+ /* Get an appropriate symbol from symtab */
+ symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL);
+ if (!symbol) {
+ pr_warning("Failed to find symbol at 0x%lx\n",
+ (unsigned long)paddr);
+ return -ENOENT;
+ }
+ tp->offset = (unsigned long)(paddr - sym.st_value);
+ tp->address = (unsigned long)paddr;
+ tp->symbol = strdup(symbol);
+ if (!tp->symbol)
+ return -ENOMEM;
+
+ /* Return probe must be on the head of a subprogram */
+ if (retprobe) {
+ if (eaddr != paddr) {
+ pr_warning("Return probe must be on the head of"
+ " a real function.\n");
+ return -EINVAL;
+ }
+ tp->retprobe = true;
+ }
+
+ return 0;
+}
+
+/* Call probe_finder callback with scope DIE */
+static int call_probe_finder(Dwarf_Die *sc_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;
+ int ret;
+
+ if (!sc_die) {
+ pr_err("Caller must pass a scope DIE. Program error.\n");
+ return -EINVAL;
+ }
- /* 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) {
- 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 = (size_t)(pf->addr - eaddr);
+ /* If not a real subprogram, find a real one */
+ if (!die_is_func_def(sc_die)) {
+ if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) {
+ pr_warning("Failed to find probe point in any "
+ "functions.\n");
+ return -ENOENT;
}
- } else {
- /* This function has no name. */
- ret = snprintf(tmp, MAX_PROBE_BUFFER, "0x%jx",
- (uintmax_t)pf->addr);
- if (!pp->function) {
- /* TODO: Use _stext */
- pp->function = strdup("");
- pp->offset = (size_t)pf->addr;
- }
- }
- DIE_IF(ret < 0);
- DIE_IF(ret >= MAX_PROBE_BUFFER);
- 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;
+ } else
+ memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die));
- /* Find each argument */
- /* TODO: use dwarf_cfi_addrframe */
- for (i = 0; i < pp->nr_args; i++) {
- pf->var = pp->args[i];
- pf->buf = &tmp[len];
- pf->len = MAX_PROBE_BUFFER - len;
- find_variable(sp_die, pf);
- len += strlen(pf->buf);
+ /* Get the frame base attribute/ops from subprogram */
+ dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr);
+ ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
+ if (ret <= 0 || nops == 0) {
+ pf->fb_ops = NULL;
+#if _ELFUTILS_PREREQ(0, 142)
+ } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa &&
+ pf->cfi != NULL) {
+ Dwarf_Frame *frame;
+ if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 ||
+ dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) {
+ pr_warning("Failed to get call frame on 0x%jx\n",
+ (uintmax_t)pf->addr);
+ return -ENOENT;
+ }
+#endif
}
+ /* Call finder's callback handler */
+ ret = pf->callback(sc_die, 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++;
+ return ret;
}
-/* Find probe point from its line number */
-static void find_probe_point_by_line(struct probe_finder *pf)
+struct find_scope_param {
+ const char *function;
+ const char *file;
+ int line;
+ int diff;
+ Dwarf_Die *die_mem;
+ bool found;
+};
+
+static int find_best_scope_cb(Dwarf_Die *fn_die, void *data)
{
- Dwarf_Lines *lines;
- Dwarf_Line *line;
- size_t nlines, i;
- Dwarf_Addr addr;
- int lineno;
+ struct find_scope_param *fsp = data;
+ const char *file;
+ int lno;
+
+ /* Skip if declared file name does not match */
+ if (fsp->file) {
+ file = dwarf_decl_file(fn_die);
+ if (!file || strcmp(fsp->file, file) != 0)
+ return 0;
+ }
+ /* If the function name is given, that's what user expects */
+ if (fsp->function) {
+ if (die_compare_name(fn_die, fsp->function)) {
+ memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
+ fsp->found = true;
+ return 1;
+ }
+ } else {
+ /* With the line number, find the nearest declared DIE */
+ dwarf_decl_line(fn_die, &lno);
+ if (lno < fsp->line && fsp->diff > fsp->line - lno) {
+ /* Keep a candidate and continue */
+ fsp->diff = fsp->line - lno;
+ memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
+ fsp->found = true;
+ }
+ }
+ return 0;
+}
+
+/* Find an appropriate scope fits to given conditions */
+static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem)
+{
+ struct find_scope_param fsp = {
+ .function = pf->pev->point.function,
+ .file = pf->fname,
+ .line = pf->lno,
+ .diff = INT_MAX,
+ .die_mem = die_mem,
+ .found = false,
+ };
+
+ cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp);
+
+ return fsp.found ? die_mem : NULL;
+}
+
+static int probe_point_line_walker(const char *fname, int lineno,
+ Dwarf_Addr addr, void *data)
+{
+ struct probe_finder *pf = data;
+ Dwarf_Die *sc_die, die_mem;
int ret;
- ret = dwarf_getsrclines(&pf->cu_die, &lines, &nlines);
- DIE_IF(ret != 0);
+ if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0)
+ return 0;
- for (i = 0; i < nlines; i++) {
- line = dwarf_onesrcline(lines, i);
- dwarf_lineno(line, &lineno);
- if (lineno != pf->lno)
- continue;
+ pf->addr = addr;
+ sc_die = find_best_scope(pf, &die_mem);
+ if (!sc_die) {
+ pr_warning("Failed to find scope of probe point.\n");
+ return -ENOENT;
+ }
- /* TODO: Get fileno from line, but how? */
- if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0)
- continue;
+ ret = call_probe_finder(sc_die, pf);
- 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;
+ /* Continue if no error, because the line will be in inline function */
+ return ret < 0 ? ret : 0;
+}
- show_probe_point(NULL, pf);
- /* Continuing, because target line might be inlined. */
- }
+/* Find probe point from its line number */
+static int find_probe_point_by_line(struct probe_finder *pf)
+{
+ return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf);
}
/* Find lines which match lazy pattern */
-static int find_lazy_match_lines(struct list_head *head,
+static int find_lazy_match_lines(struct intlist *list,
const char *fname, const char *pat)
{
- char *fbuf, *p1, *p2;
- int fd, line, nlines = 0;
- struct stat st;
+ FILE *fp;
+ char *line = NULL;
+ size_t line_len;
+ ssize_t len;
+ int count = 0, linenum = 1;
+
+ fp = fopen(fname, "r");
+ if (!fp) {
+ pr_warning("Failed to open %s: %s\n", fname, strerror(errno));
+ return -errno;
+ }
- 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;
+ while ((len = getline(&line, &line_len, fp)) > 0) {
+
+ if (line[len - 1] == '\n')
+ line[len - 1] = '\0';
+
+ if (strlazymatch(line, pat)) {
+ intlist__add(list, linenum);
+ count++;
+ }
+ linenum++;
+ }
+
+ if (ferror(fp))
+ count = -errno;
+ free(line);
+ fclose(fp);
+
+ if (count == 0)
+ pr_debug("No matched lines found in %s.\n", fname);
+ return count;
}
-/* Find probe points from lazy pattern */
-static void find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
+static int probe_point_lazy_walker(const char *fname, int lineno,
+ Dwarf_Addr addr, void *data)
{
- Dwarf_Lines *lines;
- Dwarf_Line *line;
- size_t nlines, i;
- Dwarf_Addr addr;
- Dwarf_Die die_mem;
- int lineno;
+ struct probe_finder *pf = data;
+ Dwarf_Die *sc_die, die_mem;
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);
+ if (!intlist__has_entry(pf->lcache, lineno) ||
+ strtailcmp(fname, pf->fname) != 0)
+ return 0;
- dwarf_lineno(line, &lineno);
- if (!line_list__has_line(&pf->lcache, lineno))
- continue;
+ pr_debug("Probe line found: line:%d addr:0x%llx\n",
+ lineno, (unsigned long long)addr);
+ pf->addr = addr;
+ pf->lno = lineno;
+ sc_die = find_best_scope(pf, &die_mem);
+ if (!sc_die) {
+ pr_warning("Failed to find scope of probe point.\n");
+ return -ENOENT;
+ }
- /* TODO: Get fileno from line, but how? */
- if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0)
- continue;
+ ret = call_probe_finder(sc_die, pf);
- 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;
- }
+ /*
+ * Continue if no error, because the lazy pattern will match
+ * to other lines
+ */
+ return ret < 0 ? ret : 0;
+}
- pr_debug("Probe line found: line[%d]:%d addr:0x%llx\n",
- (int)i, lineno, (unsigned long long)addr);
- pf->addr = addr;
+/* Find probe points from lazy pattern */
+static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
+{
+ int ret = 0;
- show_probe_point(sp_die, pf);
- /* Continuing, because target line might be inlined. */
+ if (intlist__empty(pf->lcache)) {
+ /* Matching lazy line pattern */
+ ret = find_lazy_match_lines(pf->lcache, pf->fname,
+ pf->pev->point.lazy_line);
+ if (ret <= 0)
+ return ret;
}
- /* TODO: deallocate lines, but how? */
+
+ return die_walk_lines(sp_die, probe_point_lazy_walker, pf);
}
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;
+ struct probe_finder *pf = data;
+ struct perf_probe_point *pp = &pf->pev->point;
+ Dwarf_Addr addr;
+ int ret;
if (pp->lazy_line)
- find_probe_point_lazy(in_die, pf);
+ ret = find_probe_point_lazy(in_die, pf);
else {
/* Get probe address */
- pf->addr = die_get_entrypc(in_die);
+ if (dwarf_entrypc(in_die, &addr) != 0) {
+ pr_warning("Failed to get entry address of %s.\n",
+ dwarf_diename(in_die));
+ return -ENOENT;
+ }
+ pf->addr = addr;
pf->addr += pp->offset;
pr_debug("found inline addr: 0x%jx\n",
(uintmax_t)pf->addr);
- show_probe_point(in_die, pf);
+ ret = call_probe_finder(in_die, pf);
}
- return DWARF_CB_OK;
+ return ret;
}
+/* Callback parameter with return value for libdw */
+struct dwarf_callback_param {
+ void *data;
+ int retval;
+};
+
/* Search function from function name */
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 dwarf_callback_param *param = data;
+ struct probe_finder *pf = param->data;
+ struct perf_probe_point *pp = &pf->pev->point;
/* Check tag and diename */
- if (dwarf_tag(sp_die) != DW_TAG_subprogram ||
- die_compare_name(sp_die, pp->function) != 0)
- return 0;
+ if (!die_is_func_def(sp_die) ||
+ !die_compare_name(sp_die, pp->function))
+ return DWARF_CB_OK;
+
+ /* Check declared file */
+ if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die)))
+ return DWARF_CB_OK;
pf->fname = dwarf_decl_file(sp_die);
if (pp->line) { /* Function relative line */
dwarf_decl_line(sp_die, &pf->lno);
pf->lno += pp->line;
- find_probe_point_by_line(pf);
+ param->retval = find_probe_point_by_line(pf);
} else if (!dwarf_func_inline(sp_die)) {
/* Real function */
if (pp->lazy_line)
- find_probe_point_lazy(sp_die, pf);
+ param->retval = find_probe_point_lazy(sp_die, pf);
else {
- pf->addr = die_get_entrypc(sp_die);
+ if (dwarf_entrypc(sp_die, &pf->addr) != 0) {
+ pr_warning("Failed to get entry address of "
+ "%s.\n", dwarf_diename(sp_die));
+ param->retval = -ENOENT;
+ return DWARF_CB_ABORT;
+ }
pf->addr += pp->offset;
/* TODO: Check the address in this function */
- show_probe_point(sp_die, pf);
+ param->retval = call_probe_finder(sp_die, pf);
}
} else
/* Inlined function: search instances */
- dwarf_func_inline_instances(sp_die, probe_point_inline_cb, pf);
+ param->retval = die_walk_instances(sp_die,
+ probe_point_inline_cb, (void *)pf);
- return 1; /* Exit; no same symbol in this CU. */
+ return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */
}
-static void find_probe_point_by_func(struct probe_finder *pf)
+static int find_probe_point_by_func(struct probe_finder *pf)
{
- dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, pf, 0);
+ struct dwarf_callback_param _param = {.data = (void *)pf,
+ .retval = 0};
+ dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0);
+ return _param.retval;
}
-/* Find a probe point */
-int find_probe_point(int fd, struct probe_point *pp)
+struct pubname_callback_param {
+ char *function;
+ char *file;
+ Dwarf_Die *cu_die;
+ Dwarf_Die *sp_die;
+ int found;
+};
+
+static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data)
{
- struct probe_finder pf = {.pp = pp};
- int ret;
+ struct pubname_callback_param *param = data;
+
+ if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) {
+ if (dwarf_tag(param->sp_die) != DW_TAG_subprogram)
+ return DWARF_CB_OK;
+
+ if (die_compare_name(param->sp_die, param->function)) {
+ if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die))
+ return DWARF_CB_OK;
+
+ if (param->file &&
+ strtailcmp(param->file, dwarf_decl_file(param->sp_die)))
+ return DWARF_CB_OK;
+
+ param->found = 1;
+ return DWARF_CB_ABORT;
+ }
+ }
+
+ return DWARF_CB_OK;
+}
+
+/* Find probe points from debuginfo */
+static int debuginfo__find_probes(struct debuginfo *dbg,
+ struct probe_finder *pf)
+{
+ struct perf_probe_point *pp = &pf->pev->point;
Dwarf_Off off, noff;
size_t cuhl;
Dwarf_Die *diep;
- Dwarf *dbg;
+ int ret = 0;
- dbg = dwarf_begin(fd, DWARF_C_READ);
- if (!dbg)
- return -ENOENT;
+#if _ELFUTILS_PREREQ(0, 142)
+ /* Get the call frame information from this dwarf */
+ pf->cfi = dwarf_getcfi_elf(dwarf_getelf(dbg->dbg));
+#endif
- pp->found = 0;
off = 0;
- line_list__init(&pf.lcache);
+ pf->lcache = intlist__new(NULL);
+ if (!pf->lcache)
+ return -ENOMEM;
+
+ /* Fastpath: lookup by function name from .debug_pubnames section */
+ if (pp->function) {
+ struct pubname_callback_param pubname_param = {
+ .function = pp->function,
+ .file = pp->file,
+ .cu_die = &pf->cu_die,
+ .sp_die = &pf->sp_die,
+ .found = 0,
+ };
+ struct dwarf_callback_param probe_param = {
+ .data = pf,
+ };
+
+ dwarf_getpubnames(dbg->dbg, pubname_search_cb,
+ &pubname_param, 0);
+ if (pubname_param.found) {
+ ret = probe_point_search_cb(&pf->sp_die, &probe_param);
+ if (ret)
+ goto found;
+ }
+ }
+
/* Loop on CUs (Compilation Unit) */
- while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
+ while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
/* Get the DIE(Debugging Information Entry) of this CU */
- diep = dwarf_offdie(dbg, off + cuhl, &pf.cu_die);
+ diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die);
if (!diep)
continue;
/* Check if target file is included. */
if (pp->file)
- pf.fname = cu_find_realpath(&pf.cu_die, pp->file);
+ pf->fname = cu_find_realpath(&pf->cu_die, pp->file);
else
- pf.fname = NULL;
+ pf->fname = NULL;
- 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->file || pf->fname) {
if (pp->function)
- find_probe_point_by_func(&pf);
+ ret = find_probe_point_by_func(pf);
else if (pp->lazy_line)
- find_probe_point_lazy(NULL, &pf);
+ ret = find_probe_point_lazy(NULL, pf);
else {
- pf.lno = pp->line;
- find_probe_point_by_line(&pf);
+ pf->lno = pp->line;
+ ret = find_probe_point_by_line(pf);
}
+ if (ret < 0)
+ break;
}
off = noff;
}
- line_list__free(&pf.lcache);
- dwarf_end(dbg);
- return pp->found;
+found:
+ intlist__delete(pf->lcache);
+ pf->lcache = NULL;
+
+ return ret;
}
-/* Find line range from its line number */
-static void find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
+struct local_vars_finder {
+ struct probe_finder *pf;
+ struct perf_probe_arg *args;
+ int max_args;
+ int nargs;
+ int ret;
+};
+
+/* Collect available variables in this scope */
+static int copy_variables_cb(Dwarf_Die *die_mem, void *data)
{
- Dwarf_Lines *lines;
- Dwarf_Line *line;
- size_t nlines, i;
- Dwarf_Addr addr;
- int lineno;
+ struct local_vars_finder *vf = data;
+ struct probe_finder *pf = vf->pf;
+ int tag;
+
+ tag = dwarf_tag(die_mem);
+ if (tag == DW_TAG_formal_parameter ||
+ tag == DW_TAG_variable) {
+ if (convert_variable_location(die_mem, vf->pf->addr,
+ vf->pf->fb_ops, &pf->sp_die,
+ NULL) == 0) {
+ vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem);
+ if (vf->args[vf->nargs].var == NULL) {
+ vf->ret = -ENOMEM;
+ return DIE_FIND_CB_END;
+ }
+ pr_debug(" %s", vf->args[vf->nargs].var);
+ vf->nargs++;
+ }
+ }
+
+ if (dwarf_haspc(die_mem, vf->pf->addr))
+ return DIE_FIND_CB_CONTINUE;
+ else
+ return DIE_FIND_CB_SIBLING;
+}
+
+static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf,
+ struct perf_probe_arg *args)
+{
+ Dwarf_Die die_mem;
+ int i;
+ int n = 0;
+ struct local_vars_finder vf = {.pf = pf, .args = args,
+ .max_args = MAX_PROBE_ARGS, .ret = 0};
+
+ for (i = 0; i < pf->pev->nargs; i++) {
+ /* var never be NULL */
+ if (strcmp(pf->pev->args[i].var, "$vars") == 0) {
+ pr_debug("Expanding $vars into:");
+ vf.nargs = n;
+ /* Special local variables */
+ die_find_child(sc_die, copy_variables_cb, (void *)&vf,
+ &die_mem);
+ pr_debug(" (%d)\n", vf.nargs - n);
+ if (vf.ret < 0)
+ return vf.ret;
+ n = vf.nargs;
+ } else {
+ /* Copy normal argument */
+ args[n] = pf->pev->args[i];
+ n++;
+ }
+ }
+ return n;
+}
+
+/* Add a found probe point into trace event list */
+static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf)
+{
+ struct trace_event_finder *tf =
+ container_of(pf, struct trace_event_finder, pf);
+ struct probe_trace_event *tev;
+ struct perf_probe_arg *args;
+ int ret, i;
+
+ /* Check number of tevs */
+ if (tf->ntevs == tf->max_tevs) {
+ pr_warning("Too many( > %d) probe point found.\n",
+ tf->max_tevs);
+ return -ERANGE;
+ }
+ tev = &tf->tevs[tf->ntevs++];
+
+ /* Trace point should be converted from subprogram DIE */
+ ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr,
+ pf->pev->point.retprobe, &tev->point);
+ if (ret < 0)
+ return ret;
+
+ pr_debug("Probe point found: %s+%lu\n", tev->point.symbol,
+ tev->point.offset);
+
+ /* Expand special probe argument if exist */
+ args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS);
+ if (args == NULL)
+ return -ENOMEM;
+
+ ret = expand_probe_args(sc_die, pf, args);
+ if (ret < 0)
+ goto end;
+
+ tev->nargs = ret;
+ tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
+ if (tev->args == NULL) {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ /* Find each argument */
+ for (i = 0; i < tev->nargs; i++) {
+ pf->pvar = &args[i];
+ pf->tvar = &tev->args[i];
+ /* Variable should be found from scope DIE */
+ ret = find_variable(sc_die, pf);
+ if (ret != 0)
+ break;
+ }
+
+end:
+ free(args);
+ return ret;
+}
+
+/* Find probe_trace_events specified by perf_probe_event from debuginfo */
+int debuginfo__find_trace_events(struct debuginfo *dbg,
+ struct perf_probe_event *pev,
+ struct probe_trace_event **tevs, int max_tevs)
+{
+ struct trace_event_finder tf = {
+ .pf = {.pev = pev, .callback = add_probe_trace_event},
+ .mod = dbg->mod, .max_tevs = max_tevs};
int ret;
- const char *src;
+
+ /* Allocate result tevs array */
+ *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs);
+ if (*tevs == NULL)
+ return -ENOMEM;
+
+ tf.tevs = *tevs;
+ tf.ntevs = 0;
+
+ ret = debuginfo__find_probes(dbg, &tf.pf);
+ if (ret < 0) {
+ zfree(tevs);
+ return ret;
+ }
+
+ return (ret < 0) ? ret : tf.ntevs;
+}
+
+#define MAX_VAR_LEN 64
+
+/* Collect available variables in this scope */
+static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
+{
+ struct available_var_finder *af = data;
+ struct variable_list *vl;
+ char buf[MAX_VAR_LEN];
+ int tag, ret;
+
+ vl = &af->vls[af->nvls - 1];
+
+ tag = dwarf_tag(die_mem);
+ if (tag == DW_TAG_formal_parameter ||
+ tag == DW_TAG_variable) {
+ ret = convert_variable_location(die_mem, af->pf.addr,
+ af->pf.fb_ops, &af->pf.sp_die,
+ NULL);
+ if (ret == 0) {
+ ret = die_get_varname(die_mem, buf, MAX_VAR_LEN);
+ pr_debug2("Add new var: %s\n", buf);
+ if (ret > 0)
+ strlist__add(vl->vars, buf);
+ }
+ }
+
+ if (af->child && dwarf_haspc(die_mem, af->pf.addr))
+ return DIE_FIND_CB_CONTINUE;
+ else
+ return DIE_FIND_CB_SIBLING;
+}
+
+/* Add a found vars into available variables list */
+static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf)
+{
+ struct available_var_finder *af =
+ container_of(pf, struct available_var_finder, pf);
+ struct variable_list *vl;
Dwarf_Die die_mem;
+ int ret;
- line_list__init(&lf->lr->line_list);
- ret = dwarf_getsrclines(&lf->cu_die, &lines, &nlines);
- DIE_IF(ret != 0);
+ /* Check number of tevs */
+ if (af->nvls == af->max_vls) {
+ pr_warning("Too many( > %d) probe point found.\n", af->max_vls);
+ return -ERANGE;
+ }
+ vl = &af->vls[af->nvls++];
+
+ /* Trace point should be converted from subprogram DIE */
+ ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr,
+ pf->pev->point.retprobe, &vl->point);
+ if (ret < 0)
+ return ret;
+
+ pr_debug("Probe point found: %s+%lu\n", vl->point.symbol,
+ vl->point.offset);
+
+ /* Find local variables */
+ vl->vars = strlist__new(true, NULL);
+ if (vl->vars == NULL)
+ return -ENOMEM;
+ af->child = true;
+ die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem);
+
+ /* Find external variables */
+ if (!af->externs)
+ goto out;
+ /* Don't need to search child DIE for externs. */
+ af->child = false;
+ die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem);
+
+out:
+ if (strlist__empty(vl->vars)) {
+ strlist__delete(vl->vars);
+ vl->vars = NULL;
+ }
- for (i = 0; i < nlines; i++) {
- line = dwarf_onesrcline(lines, i);
- ret = dwarf_lineno(line, &lineno);
- DIE_IF(ret != 0);
- if (lf->lno_s > lineno || lf->lno_e < lineno)
- continue;
+ return ret;
+}
- 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;
+/*
+ * Find available variables at given probe point
+ * Return the number of found probe points. Return 0 if there is no
+ * matched probe point. Return <0 if an error occurs.
+ */
+int debuginfo__find_available_vars_at(struct debuginfo *dbg,
+ struct perf_probe_event *pev,
+ struct variable_list **vls,
+ int max_vls, bool externs)
+{
+ struct available_var_finder af = {
+ .pf = {.pev = pev, .callback = add_available_vars},
+ .mod = dbg->mod,
+ .max_vls = max_vls, .externs = externs};
+ int ret;
+
+ /* Allocate result vls array */
+ *vls = zalloc(sizeof(struct variable_list) * max_vls);
+ if (*vls == NULL)
+ return -ENOMEM;
- /* Address filtering 2: No child include addr? */
- if (die_get_inlinefunc(sp_die, addr, &die_mem))
- continue;
+ af.vls = *vls;
+ af.nvls = 0;
+
+ ret = debuginfo__find_probes(dbg, &af.pf);
+ if (ret < 0) {
+ /* Free vlist for error */
+ while (af.nvls--) {
+ zfree(&af.vls[af.nvls].point.symbol);
+ strlist__delete(af.vls[af.nvls].vars);
}
+ zfree(vls);
+ return ret;
+ }
- /* TODO: Get fileno from line, but how? */
- src = dwarf_linesrc(line, NULL, NULL);
- if (strtailcmp(src, lf->fname) != 0)
- continue;
+ return (ret < 0) ? ret : af.nvls;
+}
- /* Copy real path */
- if (!lf->lr->path)
- lf->lr->path = strdup(src);
- line_list__add_line(&lf->lr->line_list, (unsigned int)lineno);
+/* Reverse search */
+int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr,
+ struct perf_probe_point *ppt)
+{
+ Dwarf_Die cudie, spdie, indie;
+ Dwarf_Addr _addr = 0, baseaddr = 0;
+ const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp;
+ int baseline = 0, lineno = 0, ret = 0;
+
+ /* Adjust address with bias */
+ addr += dbg->bias;
+
+ /* Find cu die */
+ if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr - dbg->bias, &cudie)) {
+ pr_warning("Failed to find debug information for address %lx\n",
+ addr);
+ ret = -EINVAL;
+ goto end;
}
+
+ /* Find a corresponding line (filename and lineno) */
+ cu_find_lineinfo(&cudie, addr, &fname, &lineno);
+ /* Don't care whether it failed or not */
+
+ /* Find a corresponding function (name, baseline and baseaddr) */
+ if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) {
+ /* Get function entry information */
+ func = basefunc = dwarf_diename(&spdie);
+ if (!func ||
+ dwarf_entrypc(&spdie, &baseaddr) != 0 ||
+ dwarf_decl_line(&spdie, &baseline) != 0) {
+ lineno = 0;
+ goto post;
+ }
+
+ fname = dwarf_decl_file(&spdie);
+ if (addr == (unsigned long)baseaddr) {
+ /* Function entry - Relative line number is 0 */
+ lineno = baseline;
+ goto post;
+ }
+
+ /* Track down the inline functions step by step */
+ while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr,
+ &indie)) {
+ /* There is an inline function */
+ if (dwarf_entrypc(&indie, &_addr) == 0 &&
+ _addr == addr) {
+ /*
+ * addr is at an inline function entry.
+ * In this case, lineno should be the call-site
+ * line number. (overwrite lineinfo)
+ */
+ lineno = die_get_call_lineno(&indie);
+ fname = die_get_call_file(&indie);
+ break;
+ } else {
+ /*
+ * addr is in an inline function body.
+ * Since lineno points one of the lines
+ * of the inline function, baseline should
+ * be the entry line of the inline function.
+ */
+ tmp = dwarf_diename(&indie);
+ if (!tmp ||
+ dwarf_decl_line(&indie, &baseline) != 0)
+ break;
+ func = tmp;
+ spdie = indie;
+ }
+ }
+ /* Verify the lineno and baseline are in a same file */
+ tmp = dwarf_decl_file(&spdie);
+ if (!tmp || strcmp(tmp, fname) != 0)
+ lineno = 0;
+ }
+
+post:
+ /* Make a relative line number or an offset */
+ if (lineno)
+ ppt->line = lineno - baseline;
+ else if (basefunc) {
+ ppt->offset = addr - (unsigned long)baseaddr;
+ func = basefunc;
+ }
+
+ /* Duplicate strings */
+ if (func) {
+ ppt->function = strdup(func);
+ if (ppt->function == NULL) {
+ ret = -ENOMEM;
+ goto end;
+ }
+ }
+ if (fname) {
+ ppt->file = strdup(fname);
+ if (ppt->file == NULL) {
+ zfree(&ppt->function);
+ ret = -ENOMEM;
+ goto end;
+ }
+ }
+end:
+ if (ret == 0 && (fname || func))
+ ret = 1; /* Found a point */
+ return ret;
+}
+
+/* Add a line and store the src path */
+static int line_range_add_line(const char *src, unsigned int lineno,
+ struct line_range *lr)
+{
+ /* Copy source path */
+ if (!lr->path) {
+ lr->path = strdup(src);
+ if (lr->path == NULL)
+ return -ENOMEM;
+ }
+ return intlist__add(lr->line_list, lineno);
+}
+
+static int line_range_walk_cb(const char *fname, int lineno,
+ Dwarf_Addr addr __maybe_unused,
+ void *data)
+{
+ struct line_finder *lf = data;
+ int err;
+
+ if ((strtailcmp(fname, lf->fname) != 0) ||
+ (lf->lno_s > lineno || lf->lno_e < lineno))
+ return 0;
+
+ err = line_range_add_line(fname, lineno, lf->lr);
+ if (err < 0 && err != -EEXIST)
+ return err;
+
+ return 0;
+}
+
+/* Find line range from its line number */
+static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
+{
+ int ret;
+
+ ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf);
+
/* Update status */
- if (!list_empty(&lf->lr->line_list))
- lf->found = 1;
+ if (ret >= 0)
+ if (!intlist__empty(lf->lr->line_list))
+ ret = lf->found = 1;
+ else
+ ret = 0; /* Lines are not found */
else {
- free(lf->lr->path);
- lf->lr->path = NULL;
+ zfree(&lf->lr->path);
}
+ return ret;
}
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 */
+ int ret = find_line_range_by_line(in_die, data);
+
+ /*
+ * We have to check all instances of inlined function, because
+ * some execution paths can be optimized out depends on the
+ * function argument of instances. However, if an error occurs,
+ * it should be handled by the caller.
+ */
+ return ret < 0 ? ret : 0;
}
-/* Search function from function name */
+/* Search function definition from function name */
static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
{
- struct line_finder *lf = (struct line_finder *)data;
+ struct dwarf_callback_param *param = data;
+ struct line_finder *lf = param->data;
struct line_range *lr = lf->lr;
- if (dwarf_tag(sp_die) == DW_TAG_subprogram &&
- die_compare_name(sp_die, lr->function) == 0) {
+ /* Check declared file */
+ if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die)))
+ return DWARF_CB_OK;
+
+ if (die_is_func_def(sp_die) &&
+ die_compare_name(sp_die, lr->function)) {
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)
+ if (lf->lno_s < 0) /* Overflow */
+ lf->lno_s = INT_MAX;
+ lf->lno_e = lr->offset + lr->end;
+ if (lf->lno_e < 0) /* Overflow */
lf->lno_e = INT_MAX;
- else
- lf->lno_e = lr->offset + lr->end;
+ pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e);
lr->start = lf->lno_s;
lr->end = lf->lno_e;
if (dwarf_func_inline(sp_die))
- dwarf_func_inline_instances(sp_die,
- line_range_inline_cb, lf);
+ param->retval = die_walk_instances(sp_die,
+ line_range_inline_cb, lf);
else
- find_line_range_by_line(sp_die, lf);
- return 1;
+ param->retval = find_line_range_by_line(sp_die, lf);
+ return DWARF_CB_ABORT;
}
- return 0;
+ return DWARF_CB_OK;
}
-static void find_line_range_by_func(struct line_finder *lf)
+static int find_line_range_by_func(struct line_finder *lf)
{
- dwarf_getfuncs(&lf->cu_die, line_range_search_cb, lf, 0);
+ struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0};
+ dwarf_getfuncs(&lf->cu_die, line_range_search_cb, &param, 0);
+ return param.retval;
}
-int find_line_range(int fd, struct line_range *lr)
+int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr)
{
struct line_finder lf = {.lr = lr, .found = 0};
- int ret;
+ int ret = 0;
Dwarf_Off off = 0, noff;
size_t cuhl;
Dwarf_Die *diep;
- Dwarf *dbg;
-
- dbg = dwarf_begin(fd, DWARF_C_READ);
- if (!dbg)
- return -ENOENT;
+ const char *comp_dir;
+
+ /* Fastpath: lookup by function name from .debug_pubnames section */
+ if (lr->function) {
+ struct pubname_callback_param pubname_param = {
+ .function = lr->function, .file = lr->file,
+ .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0};
+ struct dwarf_callback_param line_range_param = {
+ .data = (void *)&lf, .retval = 0};
+
+ dwarf_getpubnames(dbg->dbg, pubname_search_cb,
+ &pubname_param, 0);
+ if (pubname_param.found) {
+ line_range_search_cb(&lf.sp_die, &line_range_param);
+ if (lf.found)
+ goto found;
+ }
+ }
/* Loop on CUs (Compilation Unit) */
- while (!lf.found) {
- ret = dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL);
- if (ret != 0)
+ while (!lf.found && ret >= 0) {
+ if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl,
+ NULL, NULL, NULL) != 0)
break;
/* Get the DIE(Debugging Information Entry) of this CU */
- diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die);
+ diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die);
if (!diep)
continue;
@@ -814,20 +1576,28 @@ int find_line_range(int fd, struct line_range *lr)
if (!lr->file || lf.fname) {
if (lr->function)
- find_line_range_by_func(&lf);
+ ret = find_line_range_by_func(&lf);
else {
lf.lno_s = lr->start;
- if (!lr->end)
- lf.lno_e = INT_MAX;
- else
- lf.lno_e = lr->end;
- find_line_range_by_line(NULL, &lf);
+ lf.lno_e = lr->end;
+ ret = find_line_range_by_line(NULL, &lf);
}
}
off = noff;
}
- pr_debug("path: %lx\n", (unsigned long)lr->path);
- dwarf_end(dbg);
- return lf.found;
+
+found:
+ /* Store comp_dir */
+ if (lf.found) {
+ comp_dir = cu_get_comp_dir(&lf.cu_die);
+ if (comp_dir) {
+ lr->comp_dir = strdup(comp_dir);
+ if (!lr->comp_dir)
+ ret = -ENOMEM;
+ }
+ }
+
+ pr_debug("path: %s\n", lr->path);
+ return (ret < 0) ? ret : lf.found;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 22:15:54 +0000