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cgo
[ DIR ]
drwxr-xr-x
debug
[ DIR ]
drwxr-xr-x
internal
[ DIR ]
drwxr-xr-x
msan
[ DIR ]
drwxr-xr-x
pprof
[ DIR ]
drwxr-xr-x
race
[ DIR ]
drwxr-xr-x
testdata
[ DIR ]
drwxr-xr-x
trace
[ DIR ]
drwxr-xr-x
HACKING.md
13.07
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Makefile
178
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alg.go
10.18
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asm.s
1.16
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asm_386.s
40.2
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asm_amd64.s
45.78
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asm_arm.s
30.89
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asm_arm64.s
33.12
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asm_mips64x.s
22.45
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asm_mipsx.s
24.72
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asm_ppc64x.h
1023
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asm_ppc64x.s
29.39
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asm_riscv64.s
17.38
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asm_s390x.s
26.35
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asm_wasm.s
9.65
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atomic_arm64.s
259
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atomic_mips64x.s
296
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atomic_mipsx.s
258
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atomic_pointer.go
2.62
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atomic_ppc64x.s
433
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atomic_riscv64.s
307
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auxv_none.go
358
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callers_test.go
7.7
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cgo.go
2.01
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cgo_mmap.go
2.38
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cgo_ppc64x.go
411
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cgo_sigaction.go
3.09
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cgocall.go
21.38
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cgocallback.go
317
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cgocheck.go
6.8
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chan.go
19.71
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chan_test.go
21.27
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chanbarrier_test.go
1.4
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checkptr.go
2.5
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checkptr_test.go
1.27
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closure_test.go
936
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compiler.go
413
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complex.go
1.59
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complex_test.go
1.05
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cpuflags.go
740
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cpuflags_amd64.go
533
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cpuprof.go
6.65
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cputicks.go
478
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crash_cgo_test.go
13.71
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crash_nonunix_test.go
385
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crash_test.go
20.24
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crash_unix_test.go
8.89
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debug.go
1.63
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debug_test.go
6.16
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debugcall.go
2.83
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debuglog.go
17.08
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debuglog_off.go
356
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debuglog_on.go
1.09
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debuglog_test.go
4.56
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defer_test.go
9.98
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defs1_linux.go
844
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defs1_netbsd_386.go
2.84
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defs1_netbsd_amd64.go
3.07
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defs1_netbsd_arm.go
2.96
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defs1_netbsd_arm64.go
3.18
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defs1_solaris_amd64.go
4.02
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defs2_linux.go
3.51
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defs3_linux.go
1.09
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defs_aix.go
4.16
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defs_aix_ppc64.go
3.61
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defs_arm_linux.go
2.67
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defs_darwin.go
3.84
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defs_darwin_386.go
5.98
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defs_darwin_amd64.go
6.07
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defs_darwin_arm.go
3.78
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defs_darwin_arm64.go
3.84
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defs_dragonfly.go
2.54
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defs_dragonfly_amd64.go
3.25
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defs_freebsd.go
3.84
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defs_freebsd_386.go
4.35
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defs_freebsd_amd64.go
4.62
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defs_freebsd_arm.go
3.68
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defs_freebsd_arm64.go
4
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defs_illumos_amd64.go
285
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defs_linux.go
3.04
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defs_linux_386.go
4.05
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defs_linux_amd64.go
4.56
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defs_linux_arm.go
3.31
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defs_linux_arm64.go
3.23
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defs_linux_mips64x.go
3.04
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defs_linux_mipsx.go
3.18
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defs_linux_ppc64.go
3.28
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defs_linux_ppc64le.go
3.28
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defs_linux_riscv64.go
3.27
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defs_linux_s390x.go
2.76
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defs_netbsd.go
2.74
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defs_netbsd_386.go
854
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defs_netbsd_amd64.go
1.01
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defs_netbsd_arm.go
763
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defs_openbsd.go
2.6
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defs_openbsd_386.go
2.63
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defs_openbsd_amd64.go
2.83
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defs_openbsd_arm.go
2.74
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defs_openbsd_arm64.go
2.34
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defs_plan9_386.go
1.47
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defs_plan9_amd64.go
1.66
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defs_plan9_arm.go
1.73
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defs_solaris.go
3.33
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defs_solaris_amd64.go
1003
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defs_windows.go
2.07
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defs_windows_386.go
3.75
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defs_windows_amd64.go
4.51
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defs_windows_arm.go
3.59
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duff_386.s
8.24
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duff_amd64.s
5.53
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duff_arm.s
7.11
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duff_arm64.s
5.25
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duff_mips64x.s
11.28
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duff_ppc64x.s
2.45
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duff_s390x.s
507
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env_plan9.go
855
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env_posix.go
1.82
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env_test.go
1.28
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error.go
7.26
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example_test.go
1.34
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export_aix_test.go
204
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export_arm_test.go
226
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export_darwin_test.go
351
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export_debug_test.go
5.28
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export_debuglog_test.go
1.27
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export_futex_test.go
529
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export_linux_test.go
429
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export_mmap_test.go
481
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export_solaris_test.go
282
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export_test.go
23.58
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export_unix_test.go
2.28
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export_windows_test.go
652
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extern.go
11.6
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fastlog2.go
1.22
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fastlog2_test.go
784
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fastlog2table.go
904
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float.go
1.35
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funcdata.h
2.44
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futex_test.go
2.1
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gc_test.go
13.22
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gcinfo_test.go
6.18
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go_tls.h
366
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hash32.go
2.51
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hash64.go
2.6
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hash_test.go
17.54
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heapdump.go
17.1
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iface.go
15.78
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iface_test.go
6.81
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lfstack.go
1.77
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lfstack_32bit.go
522
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lfstack_64bit.go
2.15
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lfstack_test.go
2.78
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libfuzzer.go
2.58
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libfuzzer_amd64.s
940
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libfuzzer_arm64.s
751
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lock_futex.go
5.06
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lock_js.go
5.45
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lock_sema.go
6.6
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malloc.go
48.32
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malloc_test.go
9.37
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map.go
42.13
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map_benchmark_test.go
10.16
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map_fast32.go
12.18
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map_fast64.go
12.37
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map_faststr.go
13.82
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map_test.go
27.11
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mbarrier.go
12.14
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mbitmap.go
67.53
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mcache.go
5.61
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mcentral.go
7.14
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mem_aix.go
1.93
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mem_bsd.go
2.05
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mem_darwin.go
1.88
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mem_js.go
2.32
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mem_linux.go
5.58
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mem_plan9.go
4.53
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mem_windows.go
3.86
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memclr_386.s
2.4
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memclr_amd64.s
3.65
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memclr_arm.s
2.44
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memclr_arm64.s
3.48
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memclr_mips64x.s
785
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memclr_mipsx.s
1.24
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memclr_plan9_386.s
905
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memclr_plan9_amd64.s
433
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memclr_ppc64x.s
4.2
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memclr_riscv64.s
848
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memclr_s390x.s
1.89
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memclr_wasm.s
544
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memmove_386.s
4.45
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memmove_amd64.s
12.33
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memmove_arm.s
5.9
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memmove_arm64.s
3.56
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memmove_linux_amd64_test.go
1.61
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memmove_mips64x.s
1.82
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memmove_mipsx.s
4.39
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memmove_plan9_386.s
3.06
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memmove_plan9_amd64.s
3.04
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memmove_ppc64x.s
3.33
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memmove_riscv64.s
1.81
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memmove_s390x.s
2.92
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memmove_test.go
10.97
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memmove_wasm.s
1.74
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mfinal.go
14.8
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mfinal_test.go
5.85
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mfixalloc.go
2.72
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mgc.go
74.87
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mgcmark.go
46.5
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mgcscavenge.go
30.95
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mgcscavenge_test.go
12.34
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mgcstack.go
10.55
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mgcsweep.go
14.79
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mgcsweepbuf.go
5.98
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mgcwork.go
14.24
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mheap.go
61.5
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mkduff.go
6.23
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mkfastlog2table.go
1.32
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mkpreempt.go
13.33
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mksizeclasses.go
8.62
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mmap.go
847
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mpagealloc.go
35.25
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mpagealloc_32bit.go
3.75
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mpagealloc_64bit.go
6.51
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mpagealloc_test.go
28.88
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mpagecache.go
5.03
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mpagecache_test.go
9.93
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mpallocbits.go
10.69
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mpallocbits_test.go
12.93
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mprof.go
24.06
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mranges.go
5.41
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msan.go
1.39
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msan0.go
647
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msan_amd64.s
2.03
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msan_arm64.s
1.69
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msize.go
785
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mstats.go
22.62
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mwbbuf.go
10.07
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nbpipe_fcntl_libc_test.go
463
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nbpipe_fcntl_unix_test.go
445
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nbpipe_pipe.go
411
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nbpipe_pipe2.go
509
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nbpipe_test.go
2.17
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net_plan9.go
645
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netpoll.go
14.46
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netpoll_aix.go
4.64
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netpoll_epoll.go
4
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netpoll_fake.go
648
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netpoll_kqueue.go
4.39
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netpoll_solaris.go
10.56
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netpoll_stub.go
1.3
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netpoll_windows.go
4.51
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norace_linux_test.go
888
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norace_test.go
979
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numcpu_freebsd_test.go
381
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os2_aix.go
20.67
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os2_freebsd.go
302
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os2_openbsd.go
296
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os2_plan9.go
1.48
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os2_solaris.go
320
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os3_plan9.go
3.99
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os3_solaris.go
16.92
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os_aix.go
8.29
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os_android.go
463
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os_darwin.go
10.59
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os_darwin_arm.go
749
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os_darwin_arm64.go
416
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os_dragonfly.go
6.2
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os_freebsd.go
10.97
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os_freebsd2.go
478
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os_freebsd_amd64.go
529
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os_freebsd_arm.go
1.32
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os_freebsd_arm64.go
2.97
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os_freebsd_noauxv.go
254
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os_illumos.go
3.93
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os_js.go
2.93
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os_linux.go
13.16
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os_linux_arm.go
1.35
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os_linux_arm64.go
1.02
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os_linux_be64.go
816
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os_linux_generic.go
916
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os_linux_mips64x.go
999
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os_linux_mipsx.go
1.05
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os_linux_noauxv.go
307
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os_linux_novdso.go
298
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os_linux_ppc64x.go
527
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os_linux_riscv64.go
198
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os_linux_s390x.go
455
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os_linux_x86.go
2.69
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os_netbsd.go
8.49
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os_netbsd_386.go
588
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os_netbsd_amd64.go
585
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os_netbsd_arm.go
1.13
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os_netbsd_arm64.go
827
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os_nonopenbsd.go
436
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os_only_solaris.go
356
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os_openbsd.go
7.81
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os_openbsd_arm.go
749
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os_openbsd_arm64.go
714
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os_plan9.go
9.3
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os_plan9_arm.go
462
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os_solaris.go
6.49
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os_windows.go
37.01
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os_windows_arm.go
511
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panic.go
42.23
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panic32.go
4.79
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plugin.go
4.16
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${this.title}
Close
Code Editor : debuglog.go
// Copyright 2019 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // This file provides an internal debug logging facility. The debug // log is a lightweight, in-memory, per-M ring buffer. By default, the // runtime prints the debug log on panic. // // To print something to the debug log, call dlog to obtain a dlogger // and use the methods on that to add values. The values will be // space-separated in the output (much like println). // // This facility can be enabled by passing -tags debuglog when // building. Without this tag, dlog calls compile to nothing. package runtime import ( "runtime/internal/atomic" "unsafe" ) // debugLogBytes is the size of each per-M ring buffer. This is // allocated off-heap to avoid blowing up the M and hence the GC'd // heap size. const debugLogBytes = 16 << 10 // debugLogStringLimit is the maximum number of bytes in a string. // Above this, the string will be truncated with "..(n more bytes).." const debugLogStringLimit = debugLogBytes / 8 // dlog returns a debug logger. The caller can use methods on the // returned logger to add values, which will be space-separated in the // final output, much like println. The caller must call end() to // finish the message. // // dlog can be used from highly-constrained corners of the runtime: it // is safe to use in the signal handler, from within the write // barrier, from within the stack implementation, and in places that // must be recursively nosplit. // // This will be compiled away if built without the debuglog build tag. // However, argument construction may not be. If any of the arguments // are not literals or trivial expressions, consider protecting the // call with "if dlogEnabled". // //go:nosplit //go:nowritebarrierrec func dlog() *dlogger { if !dlogEnabled { return nil } // Get the time. tick, nano := uint64(cputicks()), uint64(nanotime()) // Try to get a cached logger. l := getCachedDlogger() // If we couldn't get a cached logger, try to get one from the // global pool. if l == nil { allp := (*uintptr)(unsafe.Pointer(&allDloggers)) all := (*dlogger)(unsafe.Pointer(atomic.Loaduintptr(allp))) for l1 := all; l1 != nil; l1 = l1.allLink { if atomic.Load(&l1.owned) == 0 && atomic.Cas(&l1.owned, 0, 1) { l = l1 break } } } // If that failed, allocate a new logger. if l == nil { l = (*dlogger)(sysAlloc(unsafe.Sizeof(dlogger{}), nil)) if l == nil { throw("failed to allocate debug log") } l.w.r.data = &l.w.data l.owned = 1 // Prepend to allDloggers list. headp := (*uintptr)(unsafe.Pointer(&allDloggers)) for { head := atomic.Loaduintptr(headp) l.allLink = (*dlogger)(unsafe.Pointer(head)) if atomic.Casuintptr(headp, head, uintptr(unsafe.Pointer(l))) { break } } } // If the time delta is getting too high, write a new sync // packet. We set the limit so we don't write more than 6 // bytes of delta in the record header. const deltaLimit = 1<<(3*7) - 1 // ~2ms between sync packets if tick-l.w.tick > deltaLimit || nano-l.w.nano > deltaLimit { l.w.writeSync(tick, nano) } // Reserve space for framing header. l.w.ensure(debugLogHeaderSize) l.w.write += debugLogHeaderSize // Write record header. l.w.uvarint(tick - l.w.tick) l.w.uvarint(nano - l.w.nano) gp := getg() if gp != nil && gp.m != nil && gp.m.p != 0 { l.w.varint(int64(gp.m.p.ptr().id)) } else { l.w.varint(-1) } return l } // A dlogger writes to the debug log. // // To obtain a dlogger, call dlog(). When done with the dlogger, call // end(). // //go:notinheap type dlogger struct { w debugLogWriter // allLink is the next dlogger in the allDloggers list. allLink *dlogger // owned indicates that this dlogger is owned by an M. This is // accessed atomically. owned uint32 } // allDloggers is a list of all dloggers, linked through // dlogger.allLink. This is accessed atomically. This is prepend only, // so it doesn't need to protect against ABA races. var allDloggers *dlogger //go:nosplit func (l *dlogger) end() { if !dlogEnabled { return } // Fill in framing header. size := l.w.write - l.w.r.end if !l.w.writeFrameAt(l.w.r.end, size) { throw("record too large") } // Commit the record. l.w.r.end = l.w.write // Attempt to return this logger to the cache. if putCachedDlogger(l) { return } // Return the logger to the global pool. atomic.Store(&l.owned, 0) } const ( debugLogUnknown = 1 + iota debugLogBoolTrue debugLogBoolFalse debugLogInt debugLogUint debugLogHex debugLogPtr debugLogString debugLogConstString debugLogStringOverflow debugLogPC debugLogTraceback ) //go:nosplit func (l *dlogger) b(x bool) *dlogger { if !dlogEnabled { return l } if x { l.w.byte(debugLogBoolTrue) } else { l.w.byte(debugLogBoolFalse) } return l } //go:nosplit func (l *dlogger) i(x int) *dlogger { return l.i64(int64(x)) } //go:nosplit func (l *dlogger) i8(x int8) *dlogger { return l.i64(int64(x)) } //go:nosplit func (l *dlogger) i16(x int16) *dlogger { return l.i64(int64(x)) } //go:nosplit func (l *dlogger) i32(x int32) *dlogger { return l.i64(int64(x)) } //go:nosplit func (l *dlogger) i64(x int64) *dlogger { if !dlogEnabled { return l } l.w.byte(debugLogInt) l.w.varint(x) return l } //go:nosplit func (l *dlogger) u(x uint) *dlogger { return l.u64(uint64(x)) } //go:nosplit func (l *dlogger) uptr(x uintptr) *dlogger { return l.u64(uint64(x)) } //go:nosplit func (l *dlogger) u8(x uint8) *dlogger { return l.u64(uint64(x)) } //go:nosplit func (l *dlogger) u16(x uint16) *dlogger { return l.u64(uint64(x)) } //go:nosplit func (l *dlogger) u32(x uint32) *dlogger { return l.u64(uint64(x)) } //go:nosplit func (l *dlogger) u64(x uint64) *dlogger { if !dlogEnabled { return l } l.w.byte(debugLogUint) l.w.uvarint(x) return l } //go:nosplit func (l *dlogger) hex(x uint64) *dlogger { if !dlogEnabled { return l } l.w.byte(debugLogHex) l.w.uvarint(x) return l } //go:nosplit func (l *dlogger) p(x interface{}) *dlogger { if !dlogEnabled { return l } l.w.byte(debugLogPtr) if x == nil { l.w.uvarint(0) } else { v := efaceOf(&x) switch v._type.kind & kindMask { case kindChan, kindFunc, kindMap, kindPtr, kindUnsafePointer: l.w.uvarint(uint64(uintptr(v.data))) default: throw("not a pointer type") } } return l } //go:nosplit func (l *dlogger) s(x string) *dlogger { if !dlogEnabled { return l } str := stringStructOf(&x) datap := &firstmoduledata if len(x) > 4 && datap.etext <= uintptr(str.str) && uintptr(str.str) < datap.end { // String constants are in the rodata section, which // isn't recorded in moduledata. But it has to be // somewhere between etext and end. l.w.byte(debugLogConstString) l.w.uvarint(uint64(str.len)) l.w.uvarint(uint64(uintptr(str.str) - datap.etext)) } else { l.w.byte(debugLogString) var b []byte bb := (*slice)(unsafe.Pointer(&b)) bb.array = str.str bb.len, bb.cap = str.len, str.len if len(b) > debugLogStringLimit { b = b[:debugLogStringLimit] } l.w.uvarint(uint64(len(b))) l.w.bytes(b) if len(b) != len(x) { l.w.byte(debugLogStringOverflow) l.w.uvarint(uint64(len(x) - len(b))) } } return l } //go:nosplit func (l *dlogger) pc(x uintptr) *dlogger { if !dlogEnabled { return l } l.w.byte(debugLogPC) l.w.uvarint(uint64(x)) return l } //go:nosplit func (l *dlogger) traceback(x []uintptr) *dlogger { if !dlogEnabled { return l } l.w.byte(debugLogTraceback) l.w.uvarint(uint64(len(x))) for _, pc := range x { l.w.uvarint(uint64(pc)) } return l } // A debugLogWriter is a ring buffer of binary debug log records. // // A log record consists of a 2-byte framing header and a sequence of // fields. The framing header gives the size of the record as a little // endian 16-bit value. Each field starts with a byte indicating its // type, followed by type-specific data. If the size in the framing // header is 0, it's a sync record consisting of two little endian // 64-bit values giving a new time base. // // Because this is a ring buffer, new records will eventually // overwrite old records. Hence, it maintains a reader that consumes // the log as it gets overwritten. That reader state is where an // actual log reader would start. // //go:notinheap type debugLogWriter struct { write uint64 data debugLogBuf // tick and nano are the time bases from the most recently // written sync record. tick, nano uint64 // r is a reader that consumes records as they get overwritten // by the writer. It also acts as the initial reader state // when printing the log. r debugLogReader // buf is a scratch buffer for encoding. This is here to // reduce stack usage. buf [10]byte } //go:notinheap type debugLogBuf [debugLogBytes]byte const ( // debugLogHeaderSize is the number of bytes in the framing // header of every dlog record. debugLogHeaderSize = 2 // debugLogSyncSize is the number of bytes in a sync record. debugLogSyncSize = debugLogHeaderSize + 2*8 ) //go:nosplit func (l *debugLogWriter) ensure(n uint64) { for l.write+n >= l.r.begin+uint64(len(l.data)) { // Consume record at begin. if l.r.skip() == ^uint64(0) { // Wrapped around within a record. // // TODO(austin): It would be better to just // eat the whole buffer at this point, but we // have to communicate that to the reader // somehow. throw("record wrapped around") } } } //go:nosplit func (l *debugLogWriter) writeFrameAt(pos, size uint64) bool { l.data[pos%uint64(len(l.data))] = uint8(size) l.data[(pos+1)%uint64(len(l.data))] = uint8(size >> 8) return size <= 0xFFFF } //go:nosplit func (l *debugLogWriter) writeSync(tick, nano uint64) { l.tick, l.nano = tick, nano l.ensure(debugLogHeaderSize) l.writeFrameAt(l.write, 0) l.write += debugLogHeaderSize l.writeUint64LE(tick) l.writeUint64LE(nano) l.r.end = l.write } //go:nosplit func (l *debugLogWriter) writeUint64LE(x uint64) { var b [8]byte b[0] = byte(x) b[1] = byte(x >> 8) b[2] = byte(x >> 16) b[3] = byte(x >> 24) b[4] = byte(x >> 32) b[5] = byte(x >> 40) b[6] = byte(x >> 48) b[7] = byte(x >> 56) l.bytes(b[:]) } //go:nosplit func (l *debugLogWriter) byte(x byte) { l.ensure(1) pos := l.write l.write++ l.data[pos%uint64(len(l.data))] = x } //go:nosplit func (l *debugLogWriter) bytes(x []byte) { l.ensure(uint64(len(x))) pos := l.write l.write += uint64(len(x)) for len(x) > 0 { n := copy(l.data[pos%uint64(len(l.data)):], x) pos += uint64(n) x = x[n:] } } //go:nosplit func (l *debugLogWriter) varint(x int64) { var u uint64 if x < 0 { u = (^uint64(x) << 1) | 1 // complement i, bit 0 is 1 } else { u = (uint64(x) << 1) // do not complement i, bit 0 is 0 } l.uvarint(u) } //go:nosplit func (l *debugLogWriter) uvarint(u uint64) { i := 0 for u >= 0x80 { l.buf[i] = byte(u) | 0x80 u >>= 7 i++ } l.buf[i] = byte(u) i++ l.bytes(l.buf[:i]) } type debugLogReader struct { data *debugLogBuf // begin and end are the positions in the log of the beginning // and end of the log data, modulo len(data). begin, end uint64 // tick and nano are the current time base at begin. tick, nano uint64 } //go:nosplit func (r *debugLogReader) skip() uint64 { // Read size at pos. if r.begin+debugLogHeaderSize > r.end { return ^uint64(0) } size := uint64(r.readUint16LEAt(r.begin)) if size == 0 { // Sync packet. r.tick = r.readUint64LEAt(r.begin + debugLogHeaderSize) r.nano = r.readUint64LEAt(r.begin + debugLogHeaderSize + 8) size = debugLogSyncSize } if r.begin+size > r.end { return ^uint64(0) } r.begin += size return size } //go:nosplit func (r *debugLogReader) readUint16LEAt(pos uint64) uint16 { return uint16(r.data[pos%uint64(len(r.data))]) | uint16(r.data[(pos+1)%uint64(len(r.data))])<<8 } //go:nosplit func (r *debugLogReader) readUint64LEAt(pos uint64) uint64 { var b [8]byte for i := range b { b[i] = r.data[pos%uint64(len(r.data))] pos++ } return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 | uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56 } func (r *debugLogReader) peek() (tick uint64) { // Consume any sync records. size := uint64(0) for size == 0 { if r.begin+debugLogHeaderSize > r.end { return ^uint64(0) } size = uint64(r.readUint16LEAt(r.begin)) if size != 0 { break } if r.begin+debugLogSyncSize > r.end { return ^uint64(0) } // Sync packet. r.tick = r.readUint64LEAt(r.begin + debugLogHeaderSize) r.nano = r.readUint64LEAt(r.begin + debugLogHeaderSize + 8) r.begin += debugLogSyncSize } // Peek tick delta. if r.begin+size > r.end { return ^uint64(0) } pos := r.begin + debugLogHeaderSize var u uint64 for i := uint(0); ; i += 7 { b := r.data[pos%uint64(len(r.data))] pos++ u |= uint64(b&^0x80) << i if b&0x80 == 0 { break } } if pos > r.begin+size { return ^uint64(0) } return r.tick + u } func (r *debugLogReader) header() (end, tick, nano uint64, p int) { // Read size. We've already skipped sync packets and checked // bounds in peek. size := uint64(r.readUint16LEAt(r.begin)) end = r.begin + size r.begin += debugLogHeaderSize // Read tick, nano, and p. tick = r.uvarint() + r.tick nano = r.uvarint() + r.nano p = int(r.varint()) return } func (r *debugLogReader) uvarint() uint64 { var u uint64 for i := uint(0); ; i += 7 { b := r.data[r.begin%uint64(len(r.data))] r.begin++ u |= uint64(b&^0x80) << i if b&0x80 == 0 { break } } return u } func (r *debugLogReader) varint() int64 { u := r.uvarint() var v int64 if u&1 == 0 { v = int64(u >> 1) } else { v = ^int64(u >> 1) } return v } func (r *debugLogReader) printVal() bool { typ := r.data[r.begin%uint64(len(r.data))] r.begin++ switch typ { default: print("<unknown field type ", hex(typ), " pos ", r.begin-1, " end ", r.end, ">\n") return false case debugLogUnknown: print("<unknown kind>") case debugLogBoolTrue: print(true) case debugLogBoolFalse: print(false) case debugLogInt: print(r.varint()) case debugLogUint: print(r.uvarint()) case debugLogHex, debugLogPtr: print(hex(r.uvarint())) case debugLogString: sl := r.uvarint() if r.begin+sl > r.end { r.begin = r.end print("<string length corrupted>") break } for sl > 0 { b := r.data[r.begin%uint64(len(r.data)):] if uint64(len(b)) > sl { b = b[:sl] } r.begin += uint64(len(b)) sl -= uint64(len(b)) gwrite(b) } case debugLogConstString: len, ptr := int(r.uvarint()), uintptr(r.uvarint()) ptr += firstmoduledata.etext str := stringStruct{ str: unsafe.Pointer(ptr), len: len, } s := *(*string)(unsafe.Pointer(&str)) print(s) case debugLogStringOverflow: print("..(", r.uvarint(), " more bytes)..") case debugLogPC: printDebugLogPC(uintptr(r.uvarint())) case debugLogTraceback: n := int(r.uvarint()) for i := 0; i < n; i++ { print("\n\t") printDebugLogPC(uintptr(r.uvarint())) } } return true } // printDebugLog prints the debug log. func printDebugLog() { if !dlogEnabled { return } // This function should not panic or throw since it is used in // the fatal panic path and this may deadlock. printlock() // Get the list of all debug logs. allp := (*uintptr)(unsafe.Pointer(&allDloggers)) all := (*dlogger)(unsafe.Pointer(atomic.Loaduintptr(allp))) // Count the logs. n := 0 for l := all; l != nil; l = l.allLink { n++ } if n == 0 { printunlock() return } // Prepare read state for all logs. type readState struct { debugLogReader first bool lost uint64 nextTick uint64 } state1 := sysAlloc(unsafe.Sizeof(readState{})*uintptr(n), nil) if state1 == nil { println("failed to allocate read state for", n, "logs") printunlock() return } state := (*[1 << 20]readState)(state1)[:n] { l := all for i := range state { s := &state[i] s.debugLogReader = l.w.r s.first = true s.lost = l.w.r.begin s.nextTick = s.peek() l = l.allLink } } // Print records. for { // Find the next record. var best struct { tick uint64 i int } best.tick = ^uint64(0) for i := range state { if state[i].nextTick < best.tick { best.tick = state[i].nextTick best.i = i } } if best.tick == ^uint64(0) { break } // Print record. s := &state[best.i] if s.first { print(">> begin log ", best.i) if s.lost != 0 { print("; lost first ", s.lost>>10, "KB") } print(" <<\n") s.first = false } end, _, nano, p := s.header() oldEnd := s.end s.end = end print("[") var tmpbuf [21]byte pnano := int64(nano) - runtimeInitTime if pnano < 0 { // Logged before runtimeInitTime was set. pnano = 0 } print(string(itoaDiv(tmpbuf[:], uint64(pnano), 9))) print(" P ", p, "] ") for i := 0; s.begin < s.end; i++ { if i > 0 { print(" ") } if !s.printVal() { // Abort this P log. print("<aborting P log>") end = oldEnd break } } println() // Move on to the next record. s.begin = end s.end = oldEnd s.nextTick = s.peek() } printunlock() } func printDebugLogPC(pc uintptr) { print(hex(pc)) fn := findfunc(pc) if !fn.valid() { print(" [unknown PC]") } else { name := funcname(fn) file, line := funcline(fn, pc) print(" [", name, "+", hex(pc-fn.entry), " ", file, ":", line, "]") } }
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