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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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Code Editor : profbuf.go
// Copyright 2017 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. package runtime import ( "runtime/internal/atomic" "unsafe" ) // A profBuf is a lock-free buffer for profiling events, // safe for concurrent use by one reader and one writer. // The writer may be a signal handler running without a user g. // The reader is assumed to be a user g. // // Each logged event corresponds to a fixed size header, a list of // uintptrs (typically a stack), and exactly one unsafe.Pointer tag. // The header and uintptrs are stored in the circular buffer data and the // tag is stored in a circular buffer tags, running in parallel. // In the circular buffer data, each event takes 2+hdrsize+len(stk) // words: the value 2+hdrsize+len(stk), then the time of the event, then // hdrsize words giving the fixed-size header, and then len(stk) words // for the stack. // // The current effective offsets into the tags and data circular buffers // for reading and writing are stored in the high 30 and low 32 bits of r and w. // The bottom bits of the high 32 are additional flag bits in w, unused in r. // "Effective" offsets means the total number of reads or writes, mod 2^length. // The offset in the buffer is the effective offset mod the length of the buffer. // To make wraparound mod 2^length match wraparound mod length of the buffer, // the length of the buffer must be a power of two. // // If the reader catches up to the writer, a flag passed to read controls // whether the read blocks until more data is available. A read returns a // pointer to the buffer data itself; the caller is assumed to be done with // that data at the next read. The read offset rNext tracks the next offset to // be returned by read. By definition, r ≤ rNext ≤ w (before wraparound), // and rNext is only used by the reader, so it can be accessed without atomics. // // If the writer gets ahead of the reader, so that the buffer fills, // future writes are discarded and replaced in the output stream by an // overflow entry, which has size 2+hdrsize+1, time set to the time of // the first discarded write, a header of all zeroed words, and a "stack" // containing one word, the number of discarded writes. // // Between the time the buffer fills and the buffer becomes empty enough // to hold more data, the overflow entry is stored as a pending overflow // entry in the fields overflow and overflowTime. The pending overflow // entry can be turned into a real record by either the writer or the // reader. If the writer is called to write a new record and finds that // the output buffer has room for both the pending overflow entry and the // new record, the writer emits the pending overflow entry and the new // record into the buffer. If the reader is called to read data and finds // that the output buffer is empty but that there is a pending overflow // entry, the reader will return a synthesized record for the pending // overflow entry. // // Only the writer can create or add to a pending overflow entry, but // either the reader or the writer can clear the pending overflow entry. // A pending overflow entry is indicated by the low 32 bits of 'overflow' // holding the number of discarded writes, and overflowTime holding the // time of the first discarded write. The high 32 bits of 'overflow' // increment each time the low 32 bits transition from zero to non-zero // or vice versa. This sequence number avoids ABA problems in the use of // compare-and-swap to coordinate between reader and writer. // The overflowTime is only written when the low 32 bits of overflow are // zero, that is, only when there is no pending overflow entry, in // preparation for creating a new one. The reader can therefore fetch and // clear the entry atomically using // // for { // overflow = load(&b.overflow) // if uint32(overflow) == 0 { // // no pending entry // break // } // time = load(&b.overflowTime) // if cas(&b.overflow, overflow, ((overflow>>32)+1)<<32) { // // pending entry cleared // break // } // } // if uint32(overflow) > 0 { // emit entry for uint32(overflow), time // } // type profBuf struct { // accessed atomically r, w profAtomic overflow uint64 overflowTime uint64 eof uint32 // immutable (excluding slice content) hdrsize uintptr data []uint64 tags []unsafe.Pointer // owned by reader rNext profIndex overflowBuf []uint64 // for use by reader to return overflow record wait note } // A profAtomic is the atomically-accessed word holding a profIndex. type profAtomic uint64 // A profIndex is the packet tag and data counts and flags bits, described above. type profIndex uint64 const ( profReaderSleeping profIndex = 1 << 32 // reader is sleeping and must be woken up profWriteExtra profIndex = 1 << 33 // overflow or eof waiting ) func (x *profAtomic) load() profIndex { return profIndex(atomic.Load64((*uint64)(x))) } func (x *profAtomic) store(new profIndex) { atomic.Store64((*uint64)(x), uint64(new)) } func (x *profAtomic) cas(old, new profIndex) bool { return atomic.Cas64((*uint64)(x), uint64(old), uint64(new)) } func (x profIndex) dataCount() uint32 { return uint32(x) } func (x profIndex) tagCount() uint32 { return uint32(x >> 34) } // countSub subtracts two counts obtained from profIndex.dataCount or profIndex.tagCount, // assuming that they are no more than 2^29 apart (guaranteed since they are never more than // len(data) or len(tags) apart, respectively). // tagCount wraps at 2^30, while dataCount wraps at 2^32. // This function works for both. func countSub(x, y uint32) int { // x-y is 32-bit signed or 30-bit signed; sign-extend to 32 bits and convert to int. return int(int32(x-y) << 2 >> 2) } // addCountsAndClearFlags returns the packed form of "x + (data, tag) - all flags". func (x profIndex) addCountsAndClearFlags(data, tag int) profIndex { return profIndex((uint64(x)>>34+uint64(uint32(tag)<<2>>2))<<34 | uint64(uint32(x)+uint32(data))) } // hasOverflow reports whether b has any overflow records pending. func (b *profBuf) hasOverflow() bool { return uint32(atomic.Load64(&b.overflow)) > 0 } // takeOverflow consumes the pending overflow records, returning the overflow count // and the time of the first overflow. // When called by the reader, it is racing against incrementOverflow. func (b *profBuf) takeOverflow() (count uint32, time uint64) { overflow := atomic.Load64(&b.overflow) time = atomic.Load64(&b.overflowTime) for { count = uint32(overflow) if count == 0 { time = 0 break } // Increment generation, clear overflow count in low bits. if atomic.Cas64(&b.overflow, overflow, ((overflow>>32)+1)<<32) { break } overflow = atomic.Load64(&b.overflow) time = atomic.Load64(&b.overflowTime) } return uint32(overflow), time } // incrementOverflow records a single overflow at time now. // It is racing against a possible takeOverflow in the reader. func (b *profBuf) incrementOverflow(now int64) { for { overflow := atomic.Load64(&b.overflow) // Once we see b.overflow reach 0, it's stable: no one else is changing it underfoot. // We need to set overflowTime if we're incrementing b.overflow from 0. if uint32(overflow) == 0 { // Store overflowTime first so it's always available when overflow != 0. atomic.Store64(&b.overflowTime, uint64(now)) atomic.Store64(&b.overflow, (((overflow>>32)+1)<<32)+1) break } // Otherwise we're racing to increment against reader // who wants to set b.overflow to 0. // Out of paranoia, leave 2³²-1 a sticky overflow value, // to avoid wrapping around. Extremely unlikely. if int32(overflow) == -1 { break } if atomic.Cas64(&b.overflow, overflow, overflow+1) { break } } } // newProfBuf returns a new profiling buffer with room for // a header of hdrsize words and a buffer of at least bufwords words. func newProfBuf(hdrsize, bufwords, tags int) *profBuf { if min := 2 + hdrsize + 1; bufwords < min { bufwords = min } // Buffer sizes must be power of two, so that we don't have to // worry about uint32 wraparound changing the effective position // within the buffers. We store 30 bits of count; limiting to 28 // gives us some room for intermediate calculations. if bufwords >= 1<<28 || tags >= 1<<28 { throw("newProfBuf: buffer too large") } var i int for i = 1; i < bufwords; i <<= 1 { } bufwords = i for i = 1; i < tags; i <<= 1 { } tags = i b := new(profBuf) b.hdrsize = uintptr(hdrsize) b.data = make([]uint64, bufwords) b.tags = make([]unsafe.Pointer, tags) b.overflowBuf = make([]uint64, 2+b.hdrsize+1) return b } // canWriteRecord reports whether the buffer has room // for a single contiguous record with a stack of length nstk. func (b *profBuf) canWriteRecord(nstk int) bool { br := b.r.load() bw := b.w.load() // room for tag? if countSub(br.tagCount(), bw.tagCount())+len(b.tags) < 1 { return false } // room for data? nd := countSub(br.dataCount(), bw.dataCount()) + len(b.data) want := 2 + int(b.hdrsize) + nstk i := int(bw.dataCount() % uint32(len(b.data))) if i+want > len(b.data) { // Can't fit in trailing fragment of slice. // Skip over that and start over at beginning of slice. nd -= len(b.data) - i } return nd >= want } // canWriteTwoRecords reports whether the buffer has room // for two records with stack lengths nstk1, nstk2, in that order. // Each record must be contiguous on its own, but the two // records need not be contiguous (one can be at the end of the buffer // and the other can wrap around and start at the beginning of the buffer). func (b *profBuf) canWriteTwoRecords(nstk1, nstk2 int) bool { br := b.r.load() bw := b.w.load() // room for tag? if countSub(br.tagCount(), bw.tagCount())+len(b.tags) < 2 { return false } // room for data? nd := countSub(br.dataCount(), bw.dataCount()) + len(b.data) // first record want := 2 + int(b.hdrsize) + nstk1 i := int(bw.dataCount() % uint32(len(b.data))) if i+want > len(b.data) { // Can't fit in trailing fragment of slice. // Skip over that and start over at beginning of slice. nd -= len(b.data) - i i = 0 } i += want nd -= want // second record want = 2 + int(b.hdrsize) + nstk2 if i+want > len(b.data) { // Can't fit in trailing fragment of slice. // Skip over that and start over at beginning of slice. nd -= len(b.data) - i i = 0 } return nd >= want } // write writes an entry to the profiling buffer b. // The entry begins with a fixed hdr, which must have // length b.hdrsize, followed by a variable-sized stack // and a single tag pointer *tagPtr (or nil if tagPtr is nil). // No write barriers allowed because this might be called from a signal handler. func (b *profBuf) write(tagPtr *unsafe.Pointer, now int64, hdr []uint64, stk []uintptr) { if b == nil { return } if len(hdr) > int(b.hdrsize) { throw("misuse of profBuf.write") } if hasOverflow := b.hasOverflow(); hasOverflow && b.canWriteTwoRecords(1, len(stk)) { // Room for both an overflow record and the one being written. // Write the overflow record if the reader hasn't gotten to it yet. // Only racing against reader, not other writers. count, time := b.takeOverflow() if count > 0 { var stk [1]uintptr stk[0] = uintptr(count) b.write(nil, int64(time), nil, stk[:]) } } else if hasOverflow || !b.canWriteRecord(len(stk)) { // Pending overflow without room to write overflow and new records // or no overflow but also no room for new record. b.incrementOverflow(now) b.wakeupExtra() return } // There's room: write the record. br := b.r.load() bw := b.w.load() // Profiling tag // // The tag is a pointer, but we can't run a write barrier here. // We have interrupted the OS-level execution of gp, but the // runtime still sees gp as executing. In effect, we are running // in place of the real gp. Since gp is the only goroutine that // can overwrite gp.labels, the value of gp.labels is stable during // this signal handler: it will still be reachable from gp when // we finish executing. If a GC is in progress right now, it must // keep gp.labels alive, because gp.labels is reachable from gp. // If gp were to overwrite gp.labels, the deletion barrier would // still shade that pointer, which would preserve it for the // in-progress GC, so all is well. Any future GC will see the // value we copied when scanning b.tags (heap-allocated). // We arrange that the store here is always overwriting a nil, // so there is no need for a deletion barrier on b.tags[wt]. wt := int(bw.tagCount() % uint32(len(b.tags))) if tagPtr != nil { *(*uintptr)(unsafe.Pointer(&b.tags[wt])) = uintptr(unsafe.Pointer(*tagPtr)) } // Main record. // It has to fit in a contiguous section of the slice, so if it doesn't fit at the end, // leave a rewind marker (0) and start over at the beginning of the slice. wd := int(bw.dataCount() % uint32(len(b.data))) nd := countSub(br.dataCount(), bw.dataCount()) + len(b.data) skip := 0 if wd+2+int(b.hdrsize)+len(stk) > len(b.data) { b.data[wd] = 0 skip = len(b.data) - wd nd -= skip wd = 0 } data := b.data[wd:] data[0] = uint64(2 + b.hdrsize + uintptr(len(stk))) // length data[1] = uint64(now) // time stamp // header, zero-padded i := uintptr(copy(data[2:2+b.hdrsize], hdr)) for ; i < b.hdrsize; i++ { data[2+i] = 0 } for i, pc := range stk { data[2+b.hdrsize+uintptr(i)] = uint64(pc) } for { // Commit write. // Racing with reader setting flag bits in b.w, to avoid lost wakeups. old := b.w.load() new := old.addCountsAndClearFlags(skip+2+len(stk)+int(b.hdrsize), 1) if !b.w.cas(old, new) { continue } // If there was a reader, wake it up. if old&profReaderSleeping != 0 { notewakeup(&b.wait) } break } } // close signals that there will be no more writes on the buffer. // Once all the data has been read from the buffer, reads will return eof=true. func (b *profBuf) close() { if atomic.Load(&b.eof) > 0 { throw("runtime: profBuf already closed") } atomic.Store(&b.eof, 1) b.wakeupExtra() } // wakeupExtra must be called after setting one of the "extra" // atomic fields b.overflow or b.eof. // It records the change in b.w and wakes up the reader if needed. func (b *profBuf) wakeupExtra() { for { old := b.w.load() new := old | profWriteExtra if !b.w.cas(old, new) { continue } if old&profReaderSleeping != 0 { notewakeup(&b.wait) } break } } // profBufReadMode specifies whether to block when no data is available to read. type profBufReadMode int const ( profBufBlocking profBufReadMode = iota profBufNonBlocking ) var overflowTag [1]unsafe.Pointer // always nil func (b *profBuf) read(mode profBufReadMode) (data []uint64, tags []unsafe.Pointer, eof bool) { if b == nil { return nil, nil, true } br := b.rNext // Commit previous read, returning that part of the ring to the writer. // First clear tags that have now been read, both to avoid holding // up the memory they point at for longer than necessary // and so that b.write can assume it is always overwriting // nil tag entries (see comment in b.write). rPrev := b.r.load() if rPrev != br { ntag := countSub(br.tagCount(), rPrev.tagCount()) ti := int(rPrev.tagCount() % uint32(len(b.tags))) for i := 0; i < ntag; i++ { b.tags[ti] = nil if ti++; ti == len(b.tags) { ti = 0 } } b.r.store(br) } Read: bw := b.w.load() numData := countSub(bw.dataCount(), br.dataCount()) if numData == 0 { if b.hasOverflow() { // No data to read, but there is overflow to report. // Racing with writer flushing b.overflow into a real record. count, time := b.takeOverflow() if count == 0 { // Lost the race, go around again. goto Read } // Won the race, report overflow. dst := b.overflowBuf dst[0] = uint64(2 + b.hdrsize + 1) dst[1] = uint64(time) for i := uintptr(0); i < b.hdrsize; i++ { dst[2+i] = 0 } dst[2+b.hdrsize] = uint64(count) return dst[:2+b.hdrsize+1], overflowTag[:1], false } if atomic.Load(&b.eof) > 0 { // No data, no overflow, EOF set: done. return nil, nil, true } if bw&profWriteExtra != 0 { // Writer claims to have published extra information (overflow or eof). // Attempt to clear notification and then check again. // If we fail to clear the notification it means b.w changed, // so we still need to check again. b.w.cas(bw, bw&^profWriteExtra) goto Read } // Nothing to read right now. // Return or sleep according to mode. if mode == profBufNonBlocking { return nil, nil, false } if !b.w.cas(bw, bw|profReaderSleeping) { goto Read } // Committed to sleeping. notetsleepg(&b.wait, -1) noteclear(&b.wait) goto Read } data = b.data[br.dataCount()%uint32(len(b.data)):] if len(data) > numData { data = data[:numData] } else { numData -= len(data) // available in case of wraparound } skip := 0 if data[0] == 0 { // Wraparound record. Go back to the beginning of the ring. skip = len(data) data = b.data if len(data) > numData { data = data[:numData] } } ntag := countSub(bw.tagCount(), br.tagCount()) if ntag == 0 { throw("runtime: malformed profBuf buffer - tag and data out of sync") } tags = b.tags[br.tagCount()%uint32(len(b.tags)):] if len(tags) > ntag { tags = tags[:ntag] } // Count out whole data records until either data or tags is done. // They are always in sync in the buffer, but due to an end-of-slice // wraparound we might need to stop early and return the rest // in the next call. di := 0 ti := 0 for di < len(data) && data[di] != 0 && ti < len(tags) { if uintptr(di)+uintptr(data[di]) > uintptr(len(data)) { throw("runtime: malformed profBuf buffer - invalid size") } di += int(data[di]) ti++ } // Remember how much we returned, to commit read on next call. b.rNext = br.addCountsAndClearFlags(skip+di, ti) if raceenabled { // Match racereleasemerge in runtime_setProfLabel, // so that the setting of the labels in runtime_setProfLabel // is treated as happening before any use of the labels // by our caller. The synchronization on labelSync itself is a fiction // for the race detector. The actual synchronization is handled // by the fact that the signal handler only reads from the current // goroutine and uses atomics to write the updated queue indices, // and then the read-out from the signal handler buffer uses // atomics to read those queue indices. raceacquire(unsafe.Pointer(&labelSync)) } return data[:di], tags[:ti], false }
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