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ir_perf.c
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ir_perf.c
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/*
* IR - Lightweight JIT Compilation Framework
* (Linux perf interface)
* Copyright (C) 2022 Zend by Perforce.
* Authors: Dmitry Stogov <dmitry@php.net>
*
* 1) Profile using perf-<pid>.map
* perf record ./prog
* perf report
*
* 2) Profile using jit-<pid>.dump
* perf record -k 1 ./prog
* perf inject -j -i perf.data -o perf.data.jitted
* perf report -i perf.data.jitted
*/
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
# include <limits.h>
#if defined(__linux__)
#include <sys/syscall.h>
#elif defined(__darwin__)
# include <pthread.h>
#elif defined(__FreeBSD__)
# include <sys/thr.h>
# include <sys/sysctl.h>
#elif defined(__NetBSD__)
# include <lwp.h>
#elif defined(__DragonFly__)
# include <sys/lwp.h>
# include <sys/sysctl.h>
#elif defined(__sun)
// avoiding thread.h inclusion as it conflicts with vtunes types.
extern unsigned int thr_self(void);
#elif defined(__HAIKU__)
#include <FindDirectory.h>
#endif
#include "ir.h"
#include "ir_elf.h"
#define IR_PERF_JITDUMP_HEADER_MAGIC 0x4A695444
#define IR_PERF_JITDUMP_HEADER_VERSION 1
#define IR_PERF_JITDUMP_RECORD_LOAD 0
#define IR_PERF_JITDUMP_RECORD_MOVE 1
#define IR_PERF_JITDUMP_RECORD_DEBUG_INFO 2
#define IR_PERF_JITDUMP_RECORD_CLOSE 3
#define IR_PERF_JITDUMP_UNWINDING_UNFO 4
#define ALIGN8(size) (((size) + 7) & ~7)
#define PADDING8(size) (ALIGN8(size) - (size))
typedef struct ir_perf_jitdump_header {
uint32_t magic;
uint32_t version;
uint32_t size;
uint32_t elf_mach_target;
uint32_t reserved;
uint32_t process_id;
uint64_t time_stamp;
uint64_t flags;
} ir_perf_jitdump_header;
typedef struct _ir_perf_jitdump_record {
uint32_t event;
uint32_t size;
uint64_t time_stamp;
} ir_perf_jitdump_record;
typedef struct _ir_perf_jitdump_load_record {
ir_perf_jitdump_record hdr;
uint32_t process_id;
uint32_t thread_id;
uint64_t vma;
uint64_t code_address;
uint64_t code_size;
uint64_t code_id;
} ir_perf_jitdump_load_record;
static int jitdump_fd = -1;
static void *jitdump_mem = MAP_FAILED;
static uint64_t ir_perf_timestamp(void)
{
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
return 0;
}
return ((uint64_t)ts.tv_sec * 1000000000) + ts.tv_nsec;
}
int ir_perf_jitdump_open(void)
{
char filename[64];
int fd, ret;
ir_elf_header elf_hdr;
ir_perf_jitdump_header jit_hdr;
snprintf(filename, sizeof(filename), "/tmp/jit-%d.dump", getpid());
if (!ir_perf_timestamp()) {
return 0;
}
#if defined(__linux__)
fd = open("/proc/self/exe", O_RDONLY);
#elif defined(__NetBSD__)
fd = open("/proc/curproc/exe", O_RDONLY);
#elif defined(__FreeBSD__) || defined(__DragonFly__)
char path[PATH_MAX];
size_t pathlen = sizeof(path);
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
if (sysctl(mib, 4, path, &pathlen, NULL, 0) == -1) {
return 0;
}
fd = open(path, O_RDONLY);
#elif defined(__sun)
fd = open("/proc/self/path/a.out", O_RDONLY);
#elif defined(__HAIKU__)
char path[PATH_MAX];
if (find_path(B_APP_IMAGE_SYMBOL, B_FIND_PATH_IMAGE_PATH,
NULL, path, sizeof(path)) != B_OK) {
return 0;
}
fd = open(path, O_RDONLY);
#else
fd = -1;
#endif
if (fd < 0) {
return 0;
}
ret = read(fd, &elf_hdr, sizeof(elf_hdr));
close(fd);
if (ret != sizeof(elf_hdr) ||
elf_hdr.emagic[0] != 0x7f ||
elf_hdr.emagic[1] != 'E' ||
elf_hdr.emagic[2] != 'L' ||
elf_hdr.emagic[3] != 'F') {
return 0;
}
jitdump_fd = open(filename, O_CREAT | O_TRUNC | O_RDWR, 0666);
if (jitdump_fd < 0) {
return 0;
}
jitdump_mem = mmap(NULL,
sysconf(_SC_PAGESIZE),
PROT_READ|PROT_EXEC,
MAP_PRIVATE, jitdump_fd, 0);
if (jitdump_mem == MAP_FAILED) {
close(jitdump_fd);
jitdump_fd = -1;
return 0;
}
memset(&jit_hdr, 0, sizeof(jit_hdr));
jit_hdr.magic = IR_PERF_JITDUMP_HEADER_MAGIC;
jit_hdr.version = IR_PERF_JITDUMP_HEADER_VERSION;
jit_hdr.size = sizeof(jit_hdr);
jit_hdr.elf_mach_target = elf_hdr.machine;
jit_hdr.process_id = getpid();
jit_hdr.time_stamp = ir_perf_timestamp();
jit_hdr.flags = 0;
if (write(jitdump_fd, &jit_hdr, sizeof(jit_hdr)) != sizeof(jit_hdr)) {
return 0;
}
return 1;
}
int ir_perf_jitdump_close(void)
{
int ret = 1;
if (jitdump_fd >= 0) {
ir_perf_jitdump_record rec;
rec.event = IR_PERF_JITDUMP_RECORD_CLOSE;
rec.size = sizeof(rec);
rec.time_stamp = ir_perf_timestamp();
if (write(jitdump_fd, &rec, sizeof(rec)) != sizeof(rec)) {
ret = 0;
}
close(jitdump_fd);
if (jitdump_mem != MAP_FAILED) {
munmap(jitdump_mem, sysconf(_SC_PAGESIZE));
}
}
return ret;
}
int ir_perf_jitdump_register(const char *name, const void *start, size_t size)
{
if (jitdump_fd >= 0) {
static uint64_t id = 1;
ir_perf_jitdump_load_record rec;
size_t len = strlen(name);
uint32_t thread_id = 0;
#if defined(__linux__)
thread_id = syscall(SYS_gettid);
#elif defined(__darwin__)
uint64_t thread_id_u64;
pthread_threadid_np(NULL, &thread_id_u64);
thread_id = (uint32_t) thread_id_u64;
#elif defined(__FreeBSD__)
long tid;
thr_self(&tid);
thread_id = (uint32_t)tid;
#elif defined(__OpenBSD__)
thread_id = getthrid();
#elif defined(__NetBSD__)
thread_id = _lwp_self();
#elif defined(__DragonFly__)
thread_id = lwp_gettid();
#elif defined(__sun)
thread_id = thr_self();
#endif
memset(&rec, 0, sizeof(rec));
rec.hdr.event = IR_PERF_JITDUMP_RECORD_LOAD;
rec.hdr.size = sizeof(rec) + len + 1 + size;
rec.hdr.time_stamp = ir_perf_timestamp();
rec.process_id = getpid();
rec.thread_id = thread_id;
rec.vma = (uint64_t)(uintptr_t)start;
rec.code_address = (uint64_t)(uintptr_t)start;
rec.code_size = (uint64_t)size;
rec.code_id = id++;
if (write(jitdump_fd, &rec, sizeof(rec)) != sizeof(rec)
|| write(jitdump_fd, name, len + 1) < 0
|| write(jitdump_fd, start, size) < 0) {
return 0;
}
}
return 1;
}
void ir_perf_map_register(const char *name, const void *start, size_t size)
{
static FILE *fp = NULL;
if (!fp) {
char filename[64];
snprintf(filename, sizeof(filename), "/tmp/perf-%d.map", getpid());
fp = fopen(filename, "w");
if (!fp) {
return;
}
setlinebuf(fp);
}
fprintf(fp, "%zx %zx %s\n", (size_t)(uintptr_t)start, size, name);
}