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Merge "debuggerd: Reorganize to facilitate IA commit"

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This commit is contained in:
Jean-Baptiste Queru 2010-12-13 10:48:08 -08:00 • committed by Android Code Review
commit e382cc999e
10 changed files with 296 additions and 212 deletions
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8
debuggerd/Android.mk
View file

@ -5,7 +5,11 @@ ifeq ($(TARGET_ARCH),arm)
LOCAL_PATH:= $(call my-dir) LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS) include $(CLEAR_VARS)
LOCAL_SRC_FILES:= debuggerd.c getevent.c unwind-arm.c pr-support.c utility.c symbol_table.c LOCAL_SRC_FILES:= debuggerd.c utility.c getevent.c $(TARGET_ARCH)/machine.c $(TARGET_ARCH)/unwind.c symbol_table.c
ifeq ($(TARGET_ARCH),arm)
LOCAL_SRC_FILES += $(TARGET_ARCH)/pr-support.c
endif
LOCAL_CFLAGS := -Wall LOCAL_CFLAGS := -Wall
LOCAL_MODULE := debuggerd LOCAL_MODULE := debuggerd
@ -22,7 +26,7 @@ include $(BUILD_EXECUTABLE)
include $(CLEAR_VARS) include $(CLEAR_VARS)
LOCAL_SRC_FILES := crasher.c LOCAL_SRC_FILES := crasher.c
LOCAL_SRC_FILES += crashglue.S LOCAL_SRC_FILES += $(TARGET_ARCH)/crashglue.S
LOCAL_MODULE := crasher LOCAL_MODULE := crasher
LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES) LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
LOCAL_MODULE_TAGS := eng LOCAL_MODULE_TAGS := eng

0
debuggerd/crashglue.S → debuggerd/arm/crashglue.S
View file

229
debuggerd/arm/machine.c Normal file
View file

@ -0,0 +1,229 @@
/* system/debuggerd/debuggerd.c
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#include <fcntl.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <sys/exec_elf.h>
#include <sys/stat.h>
#include <cutils/sockets.h>
#include <cutils/properties.h>
#include <linux/input.h>
#include "utility.h"
#ifdef WITH_VFP
#ifdef WITH_VFP_D32
#define NUM_VFP_REGS 32
#else
#define NUM_VFP_REGS 16
#endif
#endif
/* Main entry point to get the backtrace from the crashing process */
extern int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map,
unsigned int sp_list[],
int *frame0_pc_sane,
bool at_fault);
void dump_stack_and_code(int tfd, int pid, mapinfo *map,
int unwind_depth, unsigned int sp_list[],
bool at_fault)
{
unsigned int sp, pc, p, end, data;
struct pt_regs r;
int sp_depth;
bool only_in_tombstone = !at_fault;
char code_buffer[80];
if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return;
sp = r.ARM_sp;
pc = r.ARM_pc;
_LOG(tfd, only_in_tombstone, "\ncode around pc:\n");
end = p = pc & ~3;
p -= 32;
end += 32;
/* Dump the code around PC as:
* addr contents
* 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
* 00008d44 f7ff18a0 490ced94 68035860 d0012b00
*/
while (p <= end) {
int i;
sprintf(code_buffer, "%08x ", p);
for (i = 0; i < 4; i++) {
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
sprintf(code_buffer + strlen(code_buffer), "%08x ", data);
p += 4;
}
_LOG(tfd, only_in_tombstone, "%s\n", code_buffer);
}
if ((unsigned) r.ARM_lr != pc) {
_LOG(tfd, only_in_tombstone, "\ncode around lr:\n");
end = p = r.ARM_lr & ~3;
p -= 32;
end += 32;
/* Dump the code around LR as:
* addr contents
* 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
* 00008d44 f7ff18a0 490ced94 68035860 d0012b00
*/
while (p <= end) {
int i;
sprintf(code_buffer, "%08x ", p);
for (i = 0; i < 4; i++) {
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
sprintf(code_buffer + strlen(code_buffer), "%08x ", data);
p += 4;
}
_LOG(tfd, only_in_tombstone, "%s\n", code_buffer);
}
}
p = sp - 64;
p &= ~3;
if (unwind_depth != 0) {
if (unwind_depth < STACK_CONTENT_DEPTH) {
end = sp_list[unwind_depth-1];
}
else {
end = sp_list[STACK_CONTENT_DEPTH-1];
}
}
else {
end = sp | 0x000000ff;
end += 0xff;
}
_LOG(tfd, only_in_tombstone, "\nstack:\n");
/* If the crash is due to PC == 0, there will be two frames that
* have identical SP value.
*/
if (sp_list[0] == sp_list[1]) {
sp_depth = 1;
}
else {
sp_depth = 0;
}
while (p <= end) {
char *prompt;
char level[16];
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
if (p == sp_list[sp_depth]) {
sprintf(level, "#%02d", sp_depth++);
prompt = level;
}
else {
prompt = " ";
}
/* Print the stack content in the log for the first 3 frames. For the
* rest only print them in the tombstone file.
*/
_LOG(tfd, (sp_depth > 2) || only_in_tombstone,
"%s %08x %08x %s\n", prompt, p, data,
map_to_name(map, data, ""));
p += 4;
}
/* print another 64-byte of stack data after the last frame */
end = p+64;
while (p <= end) {
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
_LOG(tfd, (sp_depth > 2) || only_in_tombstone,
" %08x %08x %s\n", p, data,
map_to_name(map, data, ""));
p += 4;
}
}
void dump_pc_and_lr(int tfd, int pid, mapinfo *map, int unwound_level,
bool at_fault)
{
struct pt_regs r;
if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
_LOG(tfd, !at_fault, "tid %d not responding!\n", pid);
return;
}
if (unwound_level == 0) {
_LOG(tfd, !at_fault, " #%02d pc %08x %s\n", 0, r.ARM_pc,
map_to_name(map, r.ARM_pc, "<unknown>"));
}
_LOG(tfd, !at_fault, " #%02d lr %08x %s\n", 1, r.ARM_lr,
map_to_name(map, r.ARM_lr, "<unknown>"));
}
void dump_registers(int tfd, int pid, bool at_fault)
{
struct pt_regs r;
bool only_in_tombstone = !at_fault;
if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
_LOG(tfd, only_in_tombstone,
"cannot get registers: %s\n", strerror(errno));
return;
}
_LOG(tfd, only_in_tombstone, " r0 %08x r1 %08x r2 %08x r3 %08x\n",
r.ARM_r0, r.ARM_r1, r.ARM_r2, r.ARM_r3);
_LOG(tfd, only_in_tombstone, " r4 %08x r5 %08x r6 %08x r7 %08x\n",
r.ARM_r4, r.ARM_r5, r.ARM_r6, r.ARM_r7);
_LOG(tfd, only_in_tombstone, " r8 %08x r9 %08x 10 %08x fp %08x\n",
r.ARM_r8, r.ARM_r9, r.ARM_r10, r.ARM_fp);
_LOG(tfd, only_in_tombstone,
" ip %08x sp %08x lr %08x pc %08x cpsr %08x\n",
r.ARM_ip, r.ARM_sp, r.ARM_lr, r.ARM_pc, r.ARM_cpsr);
#ifdef WITH_VFP
struct user_vfp vfp_regs;
int i;
if(ptrace(PTRACE_GETVFPREGS, pid, 0, &vfp_regs)) {
_LOG(tfd, only_in_tombstone,
"cannot get registers: %s\n", strerror(errno));
return;
}
for (i = 0; i < NUM_VFP_REGS; i += 2) {
_LOG(tfd, only_in_tombstone,
" d%-2d %016llx d%-2d %016llx\n",
i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]);
}
_LOG(tfd, only_in_tombstone, " scr %08lx\n\n", vfp_regs.fpscr);
#endif
}

0
debuggerd/pr-support.c → debuggerd/arm/pr-support.c
View file

2
debuggerd/unwind-arm.c → debuggerd/arm/unwind.c
View file

@ -430,7 +430,7 @@ static _Unwind_Reason_Code log_function(_Unwind_Context *context, pid_t pid,
if (pc & 1) { if (pc & 1) {
_uw prev_word; _uw prev_word;
pc = (pc & ~1); pc = (pc & ~1);
prev_word = get_remote_word(pid, (void *) pc-4); prev_word = get_remote_word(pid, (char *) pc-4);
// Long offset // Long offset
if ((prev_word & 0xf0000000) == 0xf0000000 && if ((prev_word & 0xf0000000) == 0xf0000000 &&
(prev_word & 0x0000e000) == 0x0000e000) { (prev_word & 0x0000e000) == 0x0000e000) {

1
debuggerd/crasher.c
View file

@ -19,6 +19,7 @@
void crash1(void); void crash1(void);
void crashnostack(void); void crashnostack(void);
void maybeabort(void);
static void debuggerd_connect() static void debuggerd_connect()
{ {

215
debuggerd/debuggerd.c
View file

@ -16,8 +16,6 @@
*/ */
#include <stdio.h> #include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h> #include <errno.h>
#include <signal.h> #include <signal.h>
#include <pthread.h> #include <pthread.h>
@ -33,31 +31,15 @@
#include <cutils/sockets.h> #include <cutils/sockets.h>
#include <cutils/logd.h> #include <cutils/logd.h>
#include <cutils/sockets.h>
#include <cutils/properties.h> #include <cutils/properties.h>
#include <linux/input.h> #include <linux/input.h>
#include <private/android_filesystem_config.h> #include <private/android_filesystem_config.h>
#include "debuggerd.h"
#include "utility.h" #include "utility.h"
#ifdef WITH_VFP
#ifdef WITH_VFP_D32
#define NUM_VFP_REGS 32
#else
#define NUM_VFP_REGS 16
#endif
#endif
/* Main entry point to get the backtrace from the crashing process */
extern int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map,
unsigned int sp_list[],
int *frame0_pc_sane,
bool at_fault);
static int logsocket = -1;
#define ANDROID_LOG_INFO 4 #define ANDROID_LOG_INFO 4
/* Log information onto the tombstone */ /* Log information onto the tombstone */
@ -79,13 +61,6 @@ void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...)
__android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap); __android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap);
} }
#define LOG(fmt...) _LOG(-1, 0, fmt)
#if 0
#define XLOG(fmt...) _LOG(-1, 0, fmt)
#else
#define XLOG(fmt...) do {} while(0)
#endif
// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so // 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so
// 012345678901234567890123456789012345678901234567890123456789 // 012345678901234567890123456789012345678901234567890123456789
// 0 1 2 3 4 5 // 0 1 2 3 4 5
@ -126,186 +101,6 @@ void dump_build_info(int tfd)
_LOG(tfd, false, "Build fingerprint: '%s'\n", fingerprint); _LOG(tfd, false, "Build fingerprint: '%s'\n", fingerprint);
} }
void dump_stack_and_code(int tfd, int pid, mapinfo *map,
int unwind_depth, unsigned int sp_list[],
bool at_fault)
{
unsigned int sp, pc, p, end, data;
struct pt_regs r;
int sp_depth;
bool only_in_tombstone = !at_fault;
char code_buffer[80];
if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return;
sp = r.ARM_sp;
pc = r.ARM_pc;
_LOG(tfd, only_in_tombstone, "\ncode around pc:\n");
end = p = pc & ~3;
p -= 32;
end += 32;
/* Dump the code around PC as:
* addr contents
* 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
* 00008d44 f7ff18a0 490ced94 68035860 d0012b00
*/
while (p <= end) {
int i;
sprintf(code_buffer, "%08x ", p);
for (i = 0; i < 4; i++) {
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
sprintf(code_buffer + strlen(code_buffer), "%08x ", data);
p += 4;
}
_LOG(tfd, only_in_tombstone, "%s\n", code_buffer);
}
if ((unsigned) r.ARM_lr != pc) {
_LOG(tfd, only_in_tombstone, "\ncode around lr:\n");
end = p = r.ARM_lr & ~3;
p -= 32;
end += 32;
/* Dump the code around LR as:
* addr contents
* 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
* 00008d44 f7ff18a0 490ced94 68035860 d0012b00
*/
while (p <= end) {
int i;
sprintf(code_buffer, "%08x ", p);
for (i = 0; i < 4; i++) {
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
sprintf(code_buffer + strlen(code_buffer), "%08x ", data);
p += 4;
}
_LOG(tfd, only_in_tombstone, "%s\n", code_buffer);
}
}
p = sp - 64;
p &= ~3;
if (unwind_depth != 0) {
if (unwind_depth < STACK_CONTENT_DEPTH) {
end = sp_list[unwind_depth-1];
}
else {
end = sp_list[STACK_CONTENT_DEPTH-1];
}
}
else {
end = sp | 0x000000ff;
end += 0xff;
}
_LOG(tfd, only_in_tombstone, "\nstack:\n");
/* If the crash is due to PC == 0, there will be two frames that
* have identical SP value.
*/
if (sp_list[0] == sp_list[1]) {
sp_depth = 1;
}
else {
sp_depth = 0;
}
while (p <= end) {
char *prompt;
char level[16];
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
if (p == sp_list[sp_depth]) {
sprintf(level, "#%02d", sp_depth++);
prompt = level;
}
else {
prompt = " ";
}
/* Print the stack content in the log for the first 3 frames. For the
* rest only print them in the tombstone file.
*/
_LOG(tfd, (sp_depth > 2) || only_in_tombstone,
"%s %08x %08x %s\n", prompt, p, data,
map_to_name(map, data, ""));
p += 4;
}
/* print another 64-byte of stack data after the last frame */
end = p+64;
while (p <= end) {
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
_LOG(tfd, (sp_depth > 2) || only_in_tombstone,
" %08x %08x %s\n", p, data,
map_to_name(map, data, ""));
p += 4;
}
}
void dump_pc_and_lr(int tfd, int pid, mapinfo *map, int unwound_level,
bool at_fault)
{
struct pt_regs r;
if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
_LOG(tfd, !at_fault, "tid %d not responding!\n", pid);
return;
}
if (unwound_level == 0) {
_LOG(tfd, !at_fault, " #%02d pc %08x %s\n", 0, r.ARM_pc,
map_to_name(map, r.ARM_pc, "<unknown>"));
}
_LOG(tfd, !at_fault, " #%02d lr %08x %s\n", 1, r.ARM_lr,
map_to_name(map, r.ARM_lr, "<unknown>"));
}
void dump_registers(int tfd, int pid, bool at_fault)
{
struct pt_regs r;
bool only_in_tombstone = !at_fault;
if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
_LOG(tfd, only_in_tombstone,
"cannot get registers: %s\n", strerror(errno));
return;
}
_LOG(tfd, only_in_tombstone, " r0 %08x r1 %08x r2 %08x r3 %08x\n",
r.ARM_r0, r.ARM_r1, r.ARM_r2, r.ARM_r3);
_LOG(tfd, only_in_tombstone, " r4 %08x r5 %08x r6 %08x r7 %08x\n",
r.ARM_r4, r.ARM_r5, r.ARM_r6, r.ARM_r7);
_LOG(tfd, only_in_tombstone, " r8 %08x r9 %08x 10 %08x fp %08x\n",
r.ARM_r8, r.ARM_r9, r.ARM_r10, r.ARM_fp);
_LOG(tfd, only_in_tombstone,
" ip %08x sp %08x lr %08x pc %08x cpsr %08x\n",
r.ARM_ip, r.ARM_sp, r.ARM_lr, r.ARM_pc, r.ARM_cpsr);
#ifdef WITH_VFP
struct user_vfp vfp_regs;
int i;
if(ptrace(PTRACE_GETVFPREGS, pid, 0, &vfp_regs)) {
_LOG(tfd, only_in_tombstone,
"cannot get registers: %s\n", strerror(errno));
return;
}
for (i = 0; i < NUM_VFP_REGS; i += 2) {
_LOG(tfd, only_in_tombstone,
" d%-2d %016llx d%-2d %016llx\n",
i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]);
}
_LOG(tfd, only_in_tombstone, " scr %08lx\n\n", vfp_regs.fpscr);
#endif
}
const char *get_signame(int sig) const char *get_signame(int sig)
{ {
switch(sig) { switch(sig) {
@ -377,12 +172,14 @@ static void parse_elf_info(mapinfo *milist, pid_t pid)
/* Parse the program header */ /* Parse the program header */
get_remote_struct(pid, (char *) ptr+i, &phdr, get_remote_struct(pid, (char *) ptr+i, &phdr,
sizeof(Elf32_Phdr)); sizeof(Elf32_Phdr));
#ifdef __arm__
/* Found a EXIDX segment? */ /* Found a EXIDX segment? */
if (phdr.p_type == PT_ARM_EXIDX) { if (phdr.p_type == PT_ARM_EXIDX) {
mi->exidx_start = mi->start + phdr.p_offset; mi->exidx_start = mi->start + phdr.p_offset;
mi->exidx_end = mi->exidx_start + phdr.p_filesz; mi->exidx_end = mi->exidx_start + phdr.p_filesz;
break; break;
} }
#endif
} }
/* Try to load symbols from this file */ /* Try to load symbols from this file */
@ -398,7 +195,9 @@ void dump_crash_report(int tfd, unsigned pid, unsigned tid, bool at_fault)
mapinfo *milist = 0; mapinfo *milist = 0;
unsigned int sp_list[STACK_CONTENT_DEPTH]; unsigned int sp_list[STACK_CONTENT_DEPTH];
int stack_depth; int stack_depth;
#ifdef __arm__
int frame0_pc_sane = 1; int frame0_pc_sane = 1;
#endif
if (!at_fault) { if (!at_fault) {
_LOG(tfd, true, _LOG(tfd, true,
@ -426,6 +225,7 @@ void dump_crash_report(int tfd, unsigned pid, unsigned tid, bool at_fault)
parse_elf_info(milist, tid); parse_elf_info(milist, tid);
#if __arm__
/* If stack unwinder fails, use the default solution to dump the stack /* If stack unwinder fails, use the default solution to dump the stack
* content. * content.
*/ */
@ -440,6 +240,7 @@ void dump_crash_report(int tfd, unsigned pid, unsigned tid, bool at_fault)
} }
dump_stack_and_code(tfd, tid, milist, stack_depth, sp_list, at_fault); dump_stack_and_code(tfd, tid, milist, stack_depth, sp_list, at_fault);
#endif
while(milist) { while(milist) {
mapinfo *next = milist->next; mapinfo *next = milist->next;
@ -822,10 +623,12 @@ done:
if(fd != -1) close(fd); if(fd != -1) close(fd);
} }
int main() int main()
{ {
int s; int s;
struct sigaction act; struct sigaction act;
int logsocket = -1;
logsocket = socket_local_client("logd", logsocket = socket_local_client("logd",
ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_DGRAM); ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_DGRAM);

40
debuggerd/debuggerd.h Normal file
View file

@ -0,0 +1,40 @@
/* system/debuggerd/debuggerd.h
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <cutils/logd.h>
#include <sys/ptrace.h>
#include <unwind.h>
#include "utility.h"
#include "symbol_table.h"
/* Main entry point to get the backtrace from the crashing process */
extern int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map,
unsigned int sp_list[],
int *frame0_pc_sane,
bool at_fault);
extern void dump_registers(int tfd, int pid, bool at_fault);
extern int unwind_backtrace_with_ptrace_x86(int tfd, pid_t pid, mapinfo *map, bool at_fault);
void dump_pc_and_lr(int tfd, int pid, mapinfo *map, int unwound_level, bool at_fault);
void dump_stack_and_code(int tfd, int pid, mapinfo *map,
int unwind_depth, unsigned int sp_list[],
bool at_fault);

4
debuggerd/utility.c
View file

@ -38,14 +38,14 @@ void get_remote_struct(int pid, void *src, void *dst, size_t size)
unsigned int i; unsigned int i;
for (i = 0; i+4 <= size; i+=4) { for (i = 0; i+4 <= size; i+=4) {
*(int *)(dst+i) = ptrace(PTRACE_PEEKTEXT, pid, src+i, NULL); *(int *)((char *)dst+i) = ptrace(PTRACE_PEEKTEXT, pid, (char *)src+i, NULL);
} }
if (i < size) { if (i < size) {
int val; int val;
assert((size - i) < 4); assert((size - i) < 4);
val = ptrace(PTRACE_PEEKTEXT, pid, src+i, NULL); val = ptrace(PTRACE_PEEKTEXT, pid, (char *)src+i, NULL);
while (i < size) { while (i < size) {
((unsigned char *)dst)[i] = val & 0xff; ((unsigned char *)dst)[i] = val & 0xff;
i++; i++;

7
debuggerd/utility.h
View file

@ -56,4 +56,11 @@ const char *map_to_name(mapinfo *mi, unsigned pc, const char* def);
/* Log information onto the tombstone */ /* Log information onto the tombstone */
extern void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...); extern void _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...);
#define LOG(fmt...) _LOG(-1, 0, fmt)
#if 0
#define XLOG(fmt...) _LOG(-1, 0, fmt)
#else
#define XLOG(fmt...) do {} while(0)
#endif
#endif #endif