1// Check that when forking in basic logging mode, we get the different tids for child and parent
2// RUN: %clangxx_xray -g -std=c++11 %s -o %t
3// RUN: rm -f fork-basic-logging-test-*
4// RUN: XRAY_OPTIONS="patch_premain=true xray_logfile_base=fork-basic-logging-test- \
5// RUN: xray_mode=xray-basic verbosity=1 xray_naive_log_func_duration_threshold_us=0" \
6// RUN: %run %t 2>&1 | FileCheck %s
7// RUN: %llvm_xray convert --symbolize --output-format=yaml -instr_map=%t \
8// RUN: "`ls -S fork-basic-logging-test-* | head -1`" \
9// RUN: | FileCheck %s --check-prefix=TRACE
10
11// REQUIRES: x86_64-target-arch
12// REQUIRES: built-in-llvm-tree
13
14// Not ported.
15// UNSUPPORTED: target={{.*netbsd.*}}
16
17#include "xray/xray_log_interface.h"
18#include <stdio.h>
19#include <unistd.h>
20#include <stdint.h>
21#if defined(__linux__)
22#include <sys/syscall.h>
23#elif defined(__FreeBSD__)
24#include <sys/thr.h>
25#endif
26
27//modified from sanitizer
28
29static uintptr_t syscall_gettid() {
30 uint64_t retval;
31#ifdef __linux__
32 asm volatile("syscall" : "=a"(retval) : "a"(__NR_gettid) : "rcx", "r11",
33 "memory", "cc");
34#else
35 long t;
36 thr_self(&t);
37 retval = static_cast<uint64_t>(t);
38#endif
39 return retval;
40}
41
42/////////////
43
44static uint64_t parent_tid;
45
46[[clang::xray_always_instrument]]
47uint64_t __attribute__((noinline)) log_syscall_gettid()
48{
49 //don't optimize this function away
50 uint64_t tid = syscall_gettid();
51 printf(format: "Logging tid %lu\n", tid);
52 return tid;
53}
54
55[[clang::xray_always_instrument, clang::xray_log_args(1)]]
56void __attribute__((noinline)) print_parent_tid(uint64_t tid)
57{
58 printf(format: "Parent with tid %lu", tid);
59}
60
61[[clang::xray_always_instrument, clang::xray_log_args(1)]]
62void __attribute__((noinline)) print_child_tid(uint64_t tid)
63{
64 printf(format: "Child with tid %lu", tid);
65}
66
67[[clang::xray_always_instrument]] void __attribute__((noinline)) print_parent_or_child()
68{
69 uint64_t tid = syscall_gettid();
70 if(tid == parent_tid)
71 {
72 print_parent_tid(tid);
73 }
74 else
75 {
76 print_child_tid(tid);
77 }
78}
79
80int main()
81{
82 parent_tid = log_syscall_gettid();
83 if(fork())
84 {
85 print_parent_or_child();
86 // CHECK-DAG: Parent with tid
87 }
88 else
89 {
90 print_parent_or_child();
91 // CHECK-DAG: Child with tid
92 }
93 return 0;
94}
95
96// Make sure we know which thread is the parent process
97// TRACE-DAG: - { type: 0, func-id: [[LSGT:[0-9]+]], function: {{.*log_syscall_gettid.*}}, cpu: {{.*}}, thread: [[THREAD1:[0-9]+]], process: [[PROCESS1:[0-9]+]], kind: function-enter, tsc: {{[0-9]+}}, data: '' }
98
99// TRACE-DAG: - { type: 0, func-id: [[PPOC:[0-9]+]], function: {{.*print_parent_or_child.*}}, cpu: {{.*}}, thread: [[THREAD1]], process: [[PROCESS1]], kind: function-enter, tsc: {{[0-9]+}}, data: '' }
100//
101// The parent will print its pid
102// TRACE-DAG: - { type: 0, func-id: [[PPTARG:[0-9]+]], function: {{.*print_parent_tid.*}}, args: [ [[THREAD1]] ], cpu: {{.*}}, thread: [[THREAD1]], process: [[PROCESS1]], kind: function-enter-arg, tsc: {{[0-9]+}}, data: '' }
103// TRACE-DAG: - { type: 0, func-id: [[PPTARG]], function: {{.*print_parent_tid.*}}, cpu: {{.*}}, thread: [[THREAD1]], process: [[PROCESS1]], kind: function-exit, tsc: {{[0-9]+}}, data: '' }
104//
105// TRACE-DAG - { type: 0, func-id: [[PPOC]], function: {{.*print_parent_or_child.*}}, cpu: {{.*}}, thread: [[THREAD1]], process: [[PROCESS1]], kind: function-{{exit|tail-exit}}, tsc: {{[0-9]+}}, data: '' }
106
107// TRACE-DAG: - { type: 0, func-id: [[PPOC]], function: {{.*print_parent_or_child.*}}, cpu: {{.*}}, thread: [[THREAD2:[0-9]+]], process: [[PROCESS2:[0-9]+]], kind: function-enter, tsc: {{[0-9]+}}, data: '' }
108//
109// The child will print its pid
110// TRACE-DAG: - { type: 0, func-id: [[PCTARG:[0-9]+]], function: {{.*print_child_tid.*}}, args: [ [[THREAD2]] ], cpu: {{.*}}, thread: [[THREAD2]], process: [[PROCESS2]], kind: function-enter-arg, tsc: {{[0-9]+}}, data: '' }
111// TRACE-DAG: - { type: 0, func-id: [[PCTARG]], function: {{.*print_child_tid.*}}, cpu: {{.*}}, thread: [[THREAD2]], process: [[PROCESS2]], kind: function-exit, tsc: {{[0-9]+}}, data: '' }
112//
113// TRACE-DAG: - { type: 0, func-id: [[PPOC]], function: {{.*print_parent_or_child.*}}, cpu: {{.*}}, thread: [[THREAD2]], process: [[PROCESS2]], kind: function-{{exit|tail-exit}}, tsc: {{[0-9]+}}, data: '' }
114

source code of compiler-rt/test/xray/TestCases/Posix/fork_basic_logging.cpp